Patent Application
20090044570
The present invention relates to treat incinerator ashes; more particularly, relates to manufacturing mineral fibers from incinerator ashes or its plasma-vitrified slag by adding glass to reduce a CaO/SiO2 basicity.
Incinerator ashes contain hazardous heavy metals, dioxins, etc., which are harmful to human beings and environment. A plasma melting technology is used to melt the incinerator ashes and the lava formed flow into a water-quenching tank for obtaining a water-quenched slag. The water-quenched slag is made into mineral fibers in the following ways to reduce impact of the incinerator ashes to the environment and also the mineral fibers formed can be utilized as a recycled product.
In the early days, the water-quenched slag is made into long fibers or short fibers. The fibers are coated with an organic coating to protect the fibers from abrasion and to avoid the fibers linking with each other. In general, an organic adhesive is coated on the cylindrical mineral fiber screen. And a part of the organic adhesive is evaporated before contacting with the mineral fiber screen. The evaporated organic adhesive becomes a contaminant in an air flow obtained on manufacturing the fibers; and so it must be get rid of to avoid contamination. In addition, the organic adhesive remained on the mineral fibers may become sticky; and so the device for collecting the mineral fibers has to be totally remove shots for avoiding dropping into a product.
In the other hand, a prior art of a high pressure blowing method is used to manufacture mineral fibers. However, it is of high danger; and, the fibers contain a lot of shots. The mineral fibers from above manufacturing process are low density and do not have enough strength or stretch. Hence, the prior arts cannot fulfill all users' requests on actual use.
The main purpose of the present invention is to manufacture mineral fibers from incinerator ashes or its plasma vitrified slag by adding glass to reduce CaO/SiO2 basicity.
Another purpose of the present invention is to manufacture mineral fibers, which can be utilized as recycled product. At the same time we can solve the problems of disposing incinerator ashes and recycle the waste into a valuable recycled product.
To achieve the above purposes, the present invention is a device of manufacturing mineral fibers from incinerator ashes or its plasma vitrified slag, comprising an automatic feeding unit, a heating unit, a mineral fiber blowing unit, a mineral fiber collection unit, a waste gas and escaped mineral fiber treatment unit, a data recording and acquisition unit and a power supplier, where incinerator ashes, its plasma vitrified slag and cullet are added together in a ratio or individual to obtain high quality mineral fibers; and, by doing so, we can solve the problems of disposing incinerator ashes and recycle the waste into a valuable recycling product. Accordingly, a novel device of manufacturing mineral fibers from incinerator ashes or its plasma-vitrified slag is obtained.
The present invention will be better understood from the following detailed description of figures, in which
The following description of the preferred embodiment is provided to understand the features and the structures of the present invention.
Please refer to
On using the present invention, incinerator ashes, its plasma vitrified slag and cullet are added together in a ratio or individual and put in feeding hoppers 11 to be fed into the heating unit 2 by two automatic vibration machines 12 in sequence connected in the automatic feeding unit. The materials are mixed and melted in a melting furnace 25 of the heating unit 2 to obtain the lava. Then a temperature of the lava is adjusted and fixed at a required value through a constant temperature furnace 26. And, a flow rate of the lava is fixed by using a drive tube and a lava exit as well as an overflow recycling unit 27 at an in direct heating device 27 of the heating unit 2.
The lava is flowing to the mineral fiber blowing unit 3 after flowing through the indirect heating device 27. A high-pressure air is supplied by an air supplier 31 of the mineral fiber blowing unit 3, like an air compressor, and the high-pressure air is stored in an air-storage tank 32. The high-pressure air in the air-storage tank 32 blows the lava obtained from the constant temperature furnace 26 into mineral fibers to enter the mineral fiber collection unit 4.
The mineral fiber collection unit 4 uses an interception conveyer 422 to collect the mineral fibers and then cool down for finishing the whole manufacture of the mineral fibers. The mineral fibers obtained are heat-resistant, fire-proof, etc. and thus can be further made into a heat-resistant and fire-proof product, a sound-absorbing board, additives of aggregate, additives of construction fill materials, additives of construction spray materials, etc. Then waste gas and escaped mineral fibers produced in the above process enters the waste gas and escaped mineral fiber treatment unit 5 through an exhaust duct 44. The waste gas and escaped mineral fiber treatment unit 5 uses a wet scrubber 52 and a liquid gauge 521, to remove the waste gas and the escaped mineral fibers in the exhaust duct 44; and then is exhausted from another exhaust duct 53. Therein, the above process of inputting the materials; heating and melting the materials into the lava; blowing the lava into the mineral fibers; collecting and cooling down the mineral fibers; and removing the waste gas and the escaped mineral fibers are monitored and controlled by the data recording and acquisition unit 6 and are supplied with power by the power supplier 7.
Please further refer to
For achieving requirements of heating and controlling the lava in the heating unit, the heating unit 2 comprises an outer shell 21 of a thickness more than 2.5 millimeters (mm); an air-cooling jacket 22 with a stainless steel on the outer shell 21; a melting furnace 25; and a constant temperature furnace 26. And the heating unit 2 has four fixed feet 29 and four movable wheels 291, where the heating unit 2 is operated at a temperature between 900 and 1600 Celsius degrees (° C.) and has a surface temperature below 65° C.
Each of the melting furnace 25 and the constant temperature furnace 26 has an inner wall of a fireproof ceramic fiber plate 23 of aluminum oxide (Al2O3); and an outer wall of insulation ceramic fiber plate 24 of Al2O3. Therein, the fireproof ceramic fiber plate 23 resists a temperature more than 1800° C. and the insulation ceramic fiber plate 24 resists a temperature more than 1500° C. Both of the melting furnace 25 and the constant temperature furnace 26 has a plasma torch heater (not shown in the figure) and two R-type thermocouples (not shown in the figure), which has a temperature measuring range between 900 and 1600° C.
The melting furnace 25 and the constant temperature furnace 26 are put into a melting furnace crucible 251 and an acceptor crucible 261 respectively, where the melting furnace crucible 251 is made of 98% of aluminum oxide and the acceptor crucible 261 is made of a molten-cast refractory. The overflow recycling unit 28, as an output of the constant temperature furnace 26, is set at the indirect heating device 27 under the acceptor crucible 261 has a working temperature between 900 and 1600° C. With the above structure, a temperature is controlled to me It the mixed materials through the melting furnace crucible 251 in the melting furnace 25; a temperature of the lava 64 in the acceptor crucible 261 is adjusted in the constant temperature furnace 26 to reach a required value; then the lava 64 is flowing through the drive tube, the lava exit and the indirect heating device 27; and, then, output the lava 64 flow is set to a fixed amount coordinated with the overflow recycling unit 28.
The nozzle 33 of the mineral fiber blowing unit 3 has an outer diameter of 1 inch, made of stainless steel; and is movable leftward, rightward, upward, downward, forward and backward in three dimensional movement. The air supplier 31 of the mineral fiber blowing unit 3, like an air compressor, supplies a high-pressure air 66 to be stored in the air-storage tank 32. Then the high-pressure air 66 in the air-storage tank 32 is blowing from a nozzle 33. The mineral fiber blowing unit 3 has an emulsifier feeding device (not shown in the figure) for supplying an emulsifier at a rate of 0 to 1,000 milliliter (ml) per minutes, while the nozzle 33 supplies the high-pressure air 66 required for blowing the lava from the lava exit. Thus, the mineral fibers 67 are prevented from getting together. Therein, if the temperature and viscosity are not achieved 65, we will adjust and melt by the heating unit 2
The collection duct 41 of the mineral fiber collection unit 4 has a collection funnel 411 to make the mineral fibers 67 enter a collection box 42, where the collection box 42 comprises an exhaust interior box 421; and the interception conveyer 422. The mineral fibers 67 are collected 68 and cooled down in the exhaust interior box 421 through the interception conveyer 422. At the same time, the waste gas and the escaped mineral fibers 69 are transported to the waste gas and escaped mineral fiber treatment unit 5 by an exhaust fan motor 43 and the exhaust duct 44, where a collecting efficiency of the interception conveyer 422 is more than 99.9% and a rotating speed of the interception conveyer 422 is 2 to 500 circles per minute which control led by a frequency converter.
The waste gas and escaped mineral fiber treatment unit 5 comprises the exhaust machine 51 and the wet scrubber 52 connected with an end of the exhaust duct 44. The wet scrubber 52 comprises the liquid gauge 521. The exhaust machine 51 makes the waste gas and the escaped mineral fibers in the exhaust duct 44 enter the wet scrubber 52. The liquid gauge 521 controls a liquid level of the wet scrubber 52. The treated waste gases are exhausted 70 from the exhaust duct 53.
We summarized that the present invention is a device of manufacturing high-quality and high-value mineral fibers from incinerator ashes or its plasma vitrified slag; the mineral fibers can be made into a sound-absorbing board, additives of aggregate, additives of construction fill materials, additives of construction spray materials, etc.; and, thus, high-quality and high-value recycled product is obtained and an environmental protection issue of incinerator ashes is prevented.
The preferred embodiment herein disclosed is not intended to unnecessarily limit the scope of the invention. Therefore, simple modifications or variations belonging to the equivalent of the scope of the claims and the instructions disclosed herein for a patent are all within the scope of the present invention.
