Patent Application
20220072494
The present disclosure relates to a fluid delivery apparatus configured to deliver a slurry liquid to be brought into contact with exhaust gas discharged from a combustion device to at least one delivery destination, and to a method for modifying the fluid delivery apparatus.
Exhaust gas discharged from a combustion engine such as a boiler contains air pollutants such as SOx (sulfur oxide). As a method for reducing SOx contained in exhaust gas, there may be mentioned a wet desulfurization method in which substances such as SO2 (sulfur dioxide) are removed by a liquid substance such as an alkaline aqueous solution or slurry containing alkaline components.
As a desulfurization device used in the wet desulfurization method, an absorption tower is known which is configured to bring exhaust gas into contact with a limestone slurry containing alkaline components to scrub the exhaust gas (see for example, Patent Document 1). Patent Document 1 discloses a limestone slurry line for delivering a limestone slurry from a limestone slurry tank to an absorption tower, a regulating valve disposed in the limestone slurry line, and a return line, branching off before the regulating valve in the limestone slurry line, for returning the limestone slurry to the limestone slurry tank.
The amount of limestone slurry supplied to the absorption tower fluctuates depending on the desulfurization load. For example, when the fuel has a low sulfur content or the load of the combustion device is low, since the desulfurization load of the absorption tower is low, the amount of limestone slurry supplied to the absorption tower (supply flow rate) decreases. When the supply amount to the absorption tower decreases, the flow velocity of limestone slurry flowing in the limestone slurry line decreases, and solids in the limestone slurry may deposit in the limestone slurry line. The solids in the limestone slurry may adhere to the regulating valve and reduce the responsiveness of the regulating valve.
In the case where the supply amount required in the absorption tower is small, by decreasing the opening degree of the regulating valve, and flowing more limestone slurry than the required supply amount into the limestone slurry line and returning the excess limestone slurry to the limestone slurry tank via the return line, the flow velocity of limestone slurry in the limestone slurry line is prevented from falling below a predetermined speed. The slurry line for a slurry liquid, not only the limestone slurry, is provided with the return line as described above.
Patent Document 1: JP2005-334770A
In recent years, there has been a trend toward tighter regulations on emissions of air pollutants such as sulfur oxides and soot. One way to reduce emissions of air pollutants is to use high quality fuel with a low sulfur content in combustion engines. However, since the high-quality fuel is expensive, there is a desire to use low-cost fuel, even with a somewhat high sulfur content, in order to reduce the operating cost. When fuel with a high sulfur content is used in a combustion engine, a larger amount of limestone slurry is required to treat exhaust gas discharged from the combustion engine than when fuel with a low sulfur content is used, so that the facility (fluid delivery facility) to deliver the limestone slurry to the absorption tower may become larger.
The return line is designed to control the deposition of solids in the slurry liquid in the slurry line, but it is not really used for other purposes. Incidentally, Patent Document 1 discloses that the exhaust pipe is scrubbed by spraying the limestone slurry through a spraying device disposed at the end of a branch from the return line.
In view of the above, an object of at least one embodiment of the present invention is to provide a fluid delivery apparatus that can prevent enlargement by utilizing the return line.
(1) A fluid delivery apparatus according to at least one embodiment of the present invention is configured to deliver a slurry liquid to be brought into contact with exhaust gas discharged from a combustion device to a plurality of delivery destinations, and comprises: a first delivery line for delivering the slurry liquid from a delivery source to a first delivery destination; a return line, branching off from the first delivery line at a first bifurcation part, for returning the slurry liquid to the delivery source; a second delivery line, branching off from the return line at a second bifurcation part, for delivering the slurry liquid to a second delivery destination different from the first delivery destination; and a delivery destination switching device configured to able to switch a delivery destination of the slurry liquid flowing on an upstream side of the second bifurcation part in the return line to a downstream side of the second bifurcation part in the return line or to the second delivery line.
With the above configuration (1), the fluid delivery apparatus provided with the second delivery line and the delivery destination switching device can deliver the slurry liquid flowing on the upstream side of the second bifurcation part in the return line to the second delivery destination different from the first delivery destination. In other words, it is possible to increase the number of delivery destinations of the slurry liquid flowing through the return line and deliver the slurry liquid flowing through the return line to the increased destinations.
Further, with the above configuration, since the number of delivery destinations of the slurry liquid flowing through the return line can be increased by the second delivery line branching off from the return line and the delivery destination switching device, it is possible to prevent enlargement of the fluid delivery apparatus. Additionally, since the slurry liquid can be delivered from the same delivery source to multiple destinations of the slurry liquid, the number of sources of the slurry liquid can be reduced, which in turn prevents enlargement of the fluid delivery apparatus.
(2) In some embodiments, the delivery destination switching device described in the above (1) further comprises a washing line configured to deliver a washing liquid to the second delivery line.
When the delivery destination of the slurry liquid flowing through the return line is switched by the delivery destination switching device to the delivery source of the slurry liquid, the slurry liquid remaining in the second delivery line may settle. The settling of the slurry liquid remaining in the second delivery line may lead to blockage of the second delivery line and an increase in pressure loss.
With the above configuration (2), the washing liquid is delivered to the second delivery line by the washing line to forcibly discharge the slurry liquid remaining in the second delivery line, so that the slurry liquid remaining in the second delivery line is prevented from settling, which in turn prevents blockage of the second delivery line and an increase in pressure loss.
(3) In some embodiments, in the delivery destination switching device described in the above (1) or (2), the second delivery line includes at least one concave portion at which a slope of the second delivery line changes from downward to upward, and the fluid delivery apparatus further comprises a drain line connecting the at least one concave portion and a portion of the second delivery destination at a height lower than the concave portion.
The concave portion at which the slope of the second delivery line changes from downward to upward is where the slurry liquid tends to settle, causing blockage of the second delivery line and an increase in pressure loss. With the above configuration (3), with the drain line connecting the concave portion and a portion of the second delivery destination at a height lower than the concave portion, by using the difference in height between the concave portion and the portion of the second delivery destination lower than the concave portion, the slurry liquid in the concave portion can be delivered to the second delivery destination through the drain line by the weight of the slurry liquid. Thus, with the above configuration, it is possible to suppress settling of the slurry liquid at the concave portion where the slurry liquid tends to settle, thus effectively preventing blockage of the second delivery line and an increase in pressure loss.
(4) In some embodiments, in the delivery destination switching device described in the above (1) or (2), the second delivery line has a downward slope from the second bifurcation part to the second delivery destination.
With the above configuration (4), since the second delivery line has a downward slope from the second bifurcation part to the second delivery destination, by using the difference in height between the second bifurcation part and the second delivery destination, the slurry liquid remaining in the second delivery line can be delivered to the second delivery destination by the weight of the slurry liquid. Further, with the above configuration, even without a device for forcibly discharging the slurry liquid from the second delivery line like the washing line, the slurry liquid can be discharged from the second delivery line, so that it is possible to prevent enlargement of the fluid delivery apparatus.
(5) In some embodiments, in the fluid delivery apparatus described in any one of the above (1) to (4), the first delivery destination includes a first absorption tower, and the second delivery destination includes a second absorption tower different from the first absorption tower, or a second storage device configured to store the slurry liquid to be delivered to the second absorption tower.
With the above configuration (5), the slurry liquid to be delivered to the first absorption tower can be delivered to the second absorption tower (or the second storage device) different from the first absorption tower. If there is a device for delivering the slurry liquid to the second absorption tower (or the second storage device) separately from the fluid delivery apparatus, the fluid delivery apparatus can be used as a backup for this device. By using the fluid delivery apparatus as a backup for this device, the reliability of the exhaust gas desulfurization system equipped with the absorption tower and the fluid delivery apparatus can be improved. In addition, since the necessity of a separate spare unit for the device is eliminated, it is possible to prevent enlargement of the exhaust gas desulfurization system.
(6) In some embodiments, in the fluid delivery apparatus described in any one of the above (1) to (4), the first delivery destination includes a first separation device configured to separate a product produced in a first absorption tower from the slurry liquid, or a third storage device configured to store the slurry liquid to be delivered to the first separation device, and the second delivery destination includes a second separation device configured to separate a product produced in a second absorption tower different from the first absorption tower from the slurry liquid, or a fourth storage device configured to store the slurry liquid to be delivered to the second separation device.
With the above configuration (6), the slurry liquid to be delivered to the first separation device (or the third storage device) can be delivered to the second separation device (or the fourth storage device) different from the first separation device. Thus, the second separation device can be used as a backup for the first separation device. By using the second separation device as a backup for the first separation device, the reliability of the exhaust gas desulfurization system equipped with the separation device and the fluid delivery apparatus can be improved. In addition, since the necessity of a separate separation device is eliminated, it is possible to prevent enlargement of the exhaust gas desulfurization system.
(7) In some embodiments, in the fluid delivery apparatus described in any one of the above (1) to (4), the first delivery destination includes a separation device configured to separate a product produced in an absorption tower from the slurry liquid, or a fifth storage device configured to store the slurry liquid to be delivered to the separation device, and the second delivery destination includes a sixth storage device different from the fifth storage device and configured to store the slurry liquid to be delivered to the separation device.
With the above configuration (7), the slurry liquid to be delivered to the separation device (or the fifth storage device) can be delivered to the sixth storage device. The sixth storage device is configured to store the slurry liquid to be delivered to the separation device, as with the fifth storage device. Thus, the sixth storage device can be used as a backup for the fifth storage device. By using the sixth storage device as a backup for the fifth storage device, the reliability of the exhaust gas desulfurization system equipped with the separation device and the fifth storage device can be improved.
(8) A method for modifying a fluid delivery apparatus according to at least one embodiment of the present invention is to modify a fluid delivery apparatus configured to deliver a slurry liquid to be brought into contact with exhaust gas discharged from a combustion device to at least one delivery destination. The fluid delivery apparatus comprises: a first delivery line for delivering the slurry liquid from a delivery source to a first delivery destination; and a return line, branching off from the first delivery line at a first bifurcation part, for returning the slurry liquid to the delivery source. The method comprises: a second delivery line addition step of additionally installing a second delivery line, branching off from the return line at a second bifurcation part, for delivering the slurry liquid to a second delivery destination different from the first delivery destination; and a delivery destination switching device addition step of additionally installing a delivery destination switching device configured to able to switch a delivery destination of the slurry liquid flowing on an upstream side of the second bifurcation part in the return line to a downstream side of the second bifurcation part in the return line or to the second delivery line.
With the above method (8), by the second delivery line installed in the second delivery line addition step and the delivery destination switching device installed in the delivery destination switching device addition step, the slurry liquid flowing on the upstream side of the second bifurcation part in the return line can be delivered to the second delivery destination different from the first delivery destination. In other words, it is possible to increase the number of delivery destinations of the slurry liquid flowing through the return line and deliver the slurry liquid flowing through the return line to the increased destinations. Thus, with the above method, since the number of delivery destinations of the slurry liquid flowing through the return line can be increased by the second delivery line addition step and the delivery destination switching device addition step, it is possible to easily perform modification and prevent enlargement of the fluid delivery apparatus.
At least one embodiment of the present invention provides a fluid delivery apparatus that can prevent enlargement by making the use of a slurry liquid delivered to the return line.
Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It is intended, however, that unless particularly identified, dimensions, materials, shapes, relative positions, and the like of components described in the embodiments shall be interpreted as illustrative only and not intended to limit the scope of the present invention.
For instance, an expression of relative or absolute arrangement such as “in a direction”, “along a direction”, “parallel”, “orthogonal”, “centered”, “concentric” and “coaxial” shall not be construed as indicating only the arrangement in a strict literal sense, but also includes a state where the arrangement is relatively displaced by a tolerance, or by an angle or a distance whereby it is possible to achieve the same function.
For instance, an expression of an equal state such as “same” “equal” and “uniform” shall not be construed as indicating only the state in which the feature is strictly equal, but also includes a state in which there is a tolerance or a difference that can still achieve the same function.
Further, for instance, an expression of a shape such as a rectangular shape or a cylindrical shape shall not be construed as only the geometrically strict shape, but also includes a shape with unevenness or chamfered corners within the range in which the same effect can be achieved.
On the other hand, an expression such as “comprise”, “include”, “have”, “contain” and “constitute” are not intended to be exclusive of other components.
The same features can be indicated by the same reference numerals and not described in detail.
A fluid delivery apparatus according to an embodiment is configured to deliver a slurry liquid to be brought into contact with exhaust gas discharged from a combustion device (not shown) to a plurality of delivery destinations. Hereinafter, the fluid delivery apparatus used in an exhaust gas desulfurization device equipped with an absorption tower will be described as an example.
First, the basic configuration of the exhaust gas desulfurization device will be described based on
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The absorption tower 2 (exhaust gas desulfurization device) is a device for desulfurizing exhaust gas discharged from a combustion device (not shown). In the illustrated embodiment, the absorption tower 2 is configured to desulfurize exhaust gas by the wet limestone-gypsum method. Examples of the combustion device include an engine such as a diesel engine, a gas turbine engine, or a steam turbine engine, and a boiler.
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The direction in which the absorption tower body 21 and the exhaust gas introduction unit 23 are adjacent is defined as a first direction; the side adjacent to the exhaust gas introduction unit 23 in the first direction is defined as a first side; and the side adjacent to the exhaust gas discharge unit 24 in the first direction is defined as a second side.
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The exhaust gas introduced from the combustion device to the exhaust gas introduction unit 23 passes through the exhaust gas introduction unit 23 and then is introduced into the interior space 22 (lower interior space 22C) through the exhaust gas introduction port 251. The exhaust gas introduced into the interior space 22 flows in the lower interior space 22C from the side wall 25 on the first side to the side wall 26 on the second side and then rises in the interior space 22. The exhaust gas that has risen to the upper interior space 22D flows from the side wall 25 to the side wall 26 and then is discharged to the exhaust gas discharge unit 24 through the exhaust gas discharge port 261.
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In the illustrated embodiment, the spray nozzle 282 is composed of a liquid column nozzle configured to inject a column of the absorption liquid. That is, the illustrated absorption tower 2 is a double contact flow absorber.
The absorption tower 2 is not limited to a double contact flow absorber as long as it is configured to bring the absorber into gas-liquid contact with the exhaust gas introduced into the absorption tower 2. For example, the absorption tower 2 may be a grid absorber including a packed layer packed with a packing material for promoting gas-liquid contact in the interior space 22, or may be a spray absorber including a spray nozzle configured to radially spray the absorption liquid.
Further, the spray pipe 281 may extend along the direction perpendicular to (intersecting) the first direction in a top view. The spray nozzle 282 may be configured to spray the absorption liquid to the lower side in the vertical direction.
On the downstream side of the gas-liquid contact part 22A in the exhaust gas flow direction, a mist eliminator 27 is disposed. The mist eliminator 27 is configured to remove moisture from the exhaust gas passing through the mist eliminator 27. The exhaust gas having passed through the mist eliminator 27 is discharged to the outside of the absorption tower 2.
In the illustrated embodiment, the mist eliminator 27 is arranged in the exhaust gas discharge unit 24 and extends along the vertical direction so as to separate the upstream side and the downstream side in the exhaust gas flow direction in the exhaust gas discharge unit 24. However, the mist eliminator 27 may be arranged in the upper interior space 22D and extend along the horizontal direction. Further, the mist eliminator 27 may have a multi-stage structure.
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The limestone slurry storage device 16 may include a mixing device (not shown) configured to mix the filtrate with limestone to produce the limestone slurry.
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The supply pump 170 is configured to deliver the limestone slurry from the limestone slurry storage device 16 to the interior space 22 of the absorption tower body 21. The limestone slurry stored in the limestone slurry storage device 16 is pumped by the supply pump 170 and is delivered to the interior space 22 of the absorption tower body 21.
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In the following, if a component of the exhaust gas desulfurization device 10, such as the absorption tower 2, is that of the first exhaust gas desulfurization device 10A, “first” may be added at the beginning and A at the sign, and if the component is that of the second exhaust gas desulfurization device 10B, “second” may be added at the beginning and B at the sign. For example, the absorption tower 2 of the first exhaust gas desulfurization device 10A is referred to as a first absorption tower 2A.
In the illustrated embodiment, as shown in
The exhaust gas desulfurization device 10 (10A, 10B) includes a regulating valve 171 disposed on the downstream side (absorption tower 2 side) of the supply pump 170 in the limestone slurry line 17. The regulating valve 171 has a movable mechanism for opening and closing the limestone slurry line 17, which is the flow passage for the limestone slurry, and is configured to adjust the flow rate of the limestone slurry flowing through the limestone slurry line 17.
The amount of limestone slurry (slurry liquid) supplied to the absorption tower 2 fluctuates depending on the desulfurization load. For example, when the fuel has a low sulfur content or the load of the combustion device is low, since the desulfurization load is low, the amount of limestone slurry supplied to the absorption tower 2 decreases. When the supply amount (supply flow rate) of limestone slurry to the absorption tower 2 decreases, the flow velocity of limestone slurry flowing in the limestone slurry line 17 decreases, and solids in the limestone slurry may deposit in the limestone slurry line 17. The solids in the limestone slurry may adhere to the regulating valve 171 and reduce the responsiveness of the regulating valve 171.
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At least part of the limestone slurry flowing through the limestone slurry line 17 is pumped by the supply pump 170, passes through a portion of the limestone slurry line 17 on the upstream side of a bifurcation part 41 and the return line 4, and is returned to the limestone slurry storage device 16.
In the case where the supply amount of limestone slurry required in the absorption tower 2 is small, by decreasing the opening degree of the regulating valve 171, and flowing more limestone slurry than the required supply amount into the limestone slurry line 17 and returning the excess limestone slurry to the limestone slurry storage device 16 via the return line 4, the flow velocity of limestone slurry in the limestone slurry line 17 is prevented from falling below a predetermined speed.
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As described above, the fluid delivery apparatus 3 (3A) according to some embodiments includes the second limestone slurry line 17B (first delivery line), the second return line 4B (return line), the auxiliary limestone slurry line 5B (second delivery line), and the delivery destination switching device 6 (6B) as shown in
With the above configuration, the fluid delivery apparatus 3 (3A) provided with the auxiliary limestone slurry line 5B and the delivery destination switching device 6B can deliver the limestone slurry (slurry liquid) flowing on the upstream side of the bifurcation part 41B in the second return line 4B to the first limestone slurry storage device 16A (second delivery destination) different from the second absorption tower 2B (first delivery destination). In other words, it is possible to increase the number of delivery destinations of the limestone slurry flowing through the second return line 4B and deliver the limestone slurry flowing through the second return line 4B to the increased destinations.
Further, with the above configuration, since the number of delivery destinations of the limestone slurry flowing through the second return line 4B can be increased by the auxiliary limestone slurry line 5B branching off from the second return line 4B and the delivery destination switching device 6B, it is possible to prevent enlargement of the fluid delivery apparatus 3 (3A). Additionally, since the limestone slurry can be delivered from the same delivery source to multiple destinations of the limestone slurry, the number of sources of the limestone slurry can be reduced, which in turn prevents enlargement of the fluid delivery apparatus 3 (3A).
The fluid delivery apparatus 3 (3A) according to some embodiments further includes the second supply pump 170B, as shown in
In this case, the limestone slurry is pumped by the supply pump 170, passes through the auxiliary limestone slurry line 5B, and is delivered to the first limestone slurry storage device 16A. Thus, since the necessity of a separate supply pump for delivering the limestone slurry to the first limestone slurry storage device 16A is eliminated, it is possible to prevent enlargement of the fluid delivery apparatus 3 (3A).
In some embodiments, as shown in
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With the above configuration, since the control device 32 instructs the delivery destination switching device 6 where to deliver the limestone slurry according to the amount of limestone slurry in the first limestone slurry storage device 16A (second delivery destination) acquired by the storage amount acquisition device 31, the amount of limestone slurry in the first limestone slurry storage device 16A can be made appropriate.
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In some embodiments, each of the valve 61B and the valve 62B is a flow-rate regulating valve. The control device 32 is configured to adjust the opening degrees of the valve 61B and the valve 62B such that the amount of limestone slurry acquired by the storage amount acquisition device 31 approaches a target value DV. In this case, the amount of limestone slurry in the first limestone slurry storage device 16A can be made appropriate.
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Further, in the illustrated embodiment, the fluid delivery apparatus 3 (3B) further includes the first supply pump 170A, as shown in
With the above configuration, the fluid delivery apparatus 3 (3B) provided with the auxiliary limestone slurry lines 5A, 5B and the delivery destination switching devices 6A, 6B can deliver the limestone slurry (slurry liquid) flowing on the upstream side of the bifurcation part 41B in the second return line 4B to the first limestone slurry storage device 16A (second delivery destination) different from the second absorption tower 2B (first delivery destination), and further deliver the limestone slurry (slurry liquid) flowing on the upstream side of the bifurcation part 41A in the first return line 4A to the second limestone slurry storage device 16B (delivery source). In other words, the exhaust gas desulfurization devices 10A, 10B can deliver the limestone slurry (slurry liquid) to each other.
Further, with the above configuration, since each of the exhaust gas desulfurization devices 10A, 10B need not have an individual spare unit for the limestone slurry storage device 16, it is possible to prevent enlargement of the fluid delivery apparatus 3 (3B).
The fluid delivery apparatus 3 (3C) according to some embodiments further includes a washing line 33 configured to deliver a washing liquid to the auxiliary limestone slurry line 5B (second delivery line), as shown in
In the illustrated embodiment, as shown in
When the delivery destination of the limestone slurry flowing through the second return line 4B is set by the delivery destination switching device 6B to the second limestone slurry storage device 16B which is the delivery source of the limestone slurry, the slurry liquid remaining in the auxiliary limestone slurry line 5B may settle. The settling of the limestone slurry remaining in the auxiliary limestone slurry line 5B may lead to blockage of the auxiliary limestone slurry line 5B and an increase in pressure loss.
With the above configuration, the washing liquid is delivered to the auxiliary limestone slurry line 5B by the washing line 33 to forcibly discharge the limestone slurry remaining in the auxiliary limestone slurry line 5B, so that the limestone slurry remaining in the auxiliary limestone slurry line 5B is prevented from settling, which in turn prevents blockage of the auxiliary limestone slurry line 5B and an increase in pressure loss.
In some embodiments, as shown in
In the illustrated embodiment, as shown in
The concave portion at which the slope of the auxiliary limestone slurry line 5B (second delivery line) changes from downward to upward is where the limestone slurry (slurry liquid) tends to settle, causing blockage of the auxiliary limestone slurry line 5B and an increase in pressure loss.
With the above configuration, by using the difference in height between the concave portion 53 and the portion of the first limestone slurry storage device 16A (second delivery destination) lower than the concave portion 53, the limestone slurry in the concave portion 53 can be delivered to the first limestone slurry storage device 16A through the drain line 35 by the weight of the limestone slurry. Thus, with the above configuration, it is possible to suppress settling of the limestone slurry at the concave portion 53 where the limestone slurry tends to settle, thus effectively preventing blockage of the auxiliary limestone slurry line 5B and an increase in pressure loss.
In some embodiments, the auxiliary limestone slurry line 5B (second delivery line) for example as shown in
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With the above configuration, the fluid delivery apparatus 3 (3E) provided with the auxiliary limestone slurry line 5C and the delivery destination switching device 6C can deliver the limestone slurry (slurry liquid) flowing on the upstream side of the bifurcation part 41B in the second return line 4B to the first absorption tower 2A (second delivery destination) different from the second absorption tower 2B (first delivery destination).
In the fluid delivery apparatus 3 (3A to 3E) according to the above-described embodiments, for example as shown in
With the above configuration, the limestone slurry (slurry liquid) to be delivered to the second absorption tower 2B can be delivered to the first absorption tower 2A (or the first limestone slurry storage device 16A) different from the second absorption tower 2B. If there is a device (e.g., first filtrate storage device 14A) for delivering the limestone slurry to the first absorption tower 2A (or the first limestone slurry storage device 16A) separately from the fluid delivery apparatus 3, the fluid delivery apparatus 3 can be used as a backup for this device. By using the fluid delivery apparatus 3 as a backup for this device, the reliability of the exhaust gas desulfurization system 1A equipped with the absorption tower 2 and the fluid delivery apparatus 3 can be improved. In addition, since the necessity of a separate spare unit for the device is eliminated, it is possible to prevent enlargement of the exhaust gas desulfurization system 1A.
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Further, in the illustrated embodiment, the gypsum slurry line 12 is connected to the absorption liquid extraction port 262 and the upstream side of the separation device 13. As shown in
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The fluid delivery apparatus 8 is mounted on the exhaust gas desulfurization system 1B.
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With the above configuration, the gypsum slurry to be delivered to the separation device 13 (or the gypsum slurry storage device 133) can be delivered to the auxiliary gypsum slurry storage device 136. As with the gypsum slurry storage device 133, the auxiliary gypsum slurry storage device 136 can store the gypsum slurry to be delivered to the separation device 13. Thus, the auxiliary gypsum slurry storage device 136 can be used as a backup for the gypsum slurry storage device 133. By using the auxiliary gypsum slurry storage device 136 as a backup for the gypsum slurry storage device 133, the reliability of the exhaust gas desulfurization system 1B equipped with the separation device 13 and the gypsum slurry storage device 133 can be improved.
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With the above configuration, the gypsum slurry to be delivered to the second separation device 13B (or the second gypsum slurry storage device 133B) can be delivered to the first separation device 13A (or the first gypsum slurry storage device 133A). Thus, the second separation device 13B can be used as a backup for the first separation device 13A. By using the second separation device 13B as a backup for the first separation device 13A, the reliability of the exhaust gas desulfurization system 1 equipped with the separation device 13 (13A, 13B) and the fluid delivery apparatus 8 can be improved. In addition, since the necessity of providing the separation device 13 separately for each exhaust gas desulfurization system 70 is eliminated, it is possible to prevent enlargement of the exhaust gas desulfurization system 1.
The fluid delivery apparatus modification method 100 according to some embodiments is to modify a fluid delivery apparatus (e.g., fluid delivery apparatus 3, 8) configured to deliver a slurry liquid to at least one delivery destination.
The fluid delivery apparatus according to the present embodiment includes the first delivery line (e.g., second limestone slurry line 17B, second gypsum slurry line 12B), and the return line (e.g., second return line 4B, second gypsum slurry return line 71B).
The fluid delivery apparatus modification method 100 includes a second delivery line addition step 101 of additionally installing the second delivery line (auxiliary limestone slurry line 5, auxiliary gypsum slurry line 81, 85) and a delivery destination switching device addition step 102 of additionally installing the delivery destination switching device (delivery destination switching device 6, 82, 86).
With the above method, by the second delivery line (auxiliary limestone slurry line 5, auxiliary gypsum slurry lines 81, 85) installed in the second delivery line addition step 101 and the delivery destination switching device (delivery destination switching devices 6, 82, 86) installed in the delivery destination switching device addition step 102, the slurry liquid flowing on the upstream side of the bifurcation part (e.g., bifurcation parts 41B, 711B) in the return line (e.g., second return line 4B, second gypsum slurry return line 71B) can be delivered to the second delivery destination (e.g., first gypsum slurry storage device 16A) different from the first delivery destination (e.g., second absorption tower 2B). In other words, it is possible to increase the number of delivery destinations of the slurry liquid flowing through the return line and deliver the slurry liquid flowing through the return line to the increased destinations. Thus, with the above method, since the number of delivery destinations of the slurry liquid flowing through the return line can be increased by the second delivery line addition step 101 and the delivery destination switching device addition step 102, it is possible to easily perform modification and prevent enlargement of the fluid delivery apparatus (e.g., fluid delivery apparatus 3, 8).
The present invention is not limited to the embodiments described above, but includes modifications to the embodiments described above, and embodiments composed of combinations of those embodiments.
| Number | Date | Country | Kind |
|---|---|---|---|
| 2018-243969 | Dec 2018 | JP | national |
| Filing Document | Filing Date | Country | Kind |
|---|---|---|---|
| PCT/JP2019/050172 | 12/20/2019 | WO | 00 |
