Patent Application
20180106474
The present disclosure relates to superheaters. More particularly, the present disclosure relates to superheaters that include carbon nanotube heating elements.
In practice, power boilers may include superheaters (SH), (i.e., heat exchangers, in which the temperature of high pressure steam produced in an evaporator is raised above a saturation temperature). Superheated steam is then conducted to a high pressure steam turbine to produce steam power. Many boilers also comprise a reheater, in which the temperature of lower pressure steam released from the high pressure steam turbine is raised again, in order to produce more power by an intermediate pressure steam turbine. In the following, the term “superheater” may refer to either an actual superheater or a reheater. The term supercritical (SC) boiler refers to a boiler having a steam temperature of at least about 550° C., whereas, for ultra supercritical (USC) boilers, the steam temperature is at least about 600° C. The use of increased superheat and reheat temperatures improves the cycle, and thus, the plant efficiency.
Usually, a power boiler comprises a superheater system consisting of multiple in-series-connected superheater sections, which are located in different parts of the boiler. Superheaters are generally called convective superheaters (CSH), into which heat is mainly conducted by hot flue gas, or radiant superheaters (RSH), which dominantly absorb heat by radiation. Radiant superheaters are arranged at the top of the furnace of a boiler to be in direct visibility to the flames in the furnace. For SC and USC pulverized coal firing boilers, the duty of the RSH is substantially greater than that for a supercritical boiler. Thus, a series RSH arrangement is often used to obtain the required steam enthalpy. The metal tube temperature of an RSH depends on the local heat flux and on the temperature of the steam flowing in the tube. The metal temperature can be especially high at the bottom of a radiant SH, facing the flame zone.
Superheating of saturated steam is usually started in a CHS arranged in the flue gas channel downstream of the furnace. From the CHS, the steam usually goes to an RSH arranged at the upper portions of the furnace. The RSH may comprise pendant tube coils or hanging panels of tubes, or divisional tubewalls arranged parallel to the flue gas flow. Steam leaving the RSH usually goes to an attemperator, where water is sprayed onto the steam, to bring down the steam temperature to its desired value. From the attemperator, steam finally goes to a pendant superheater (PSH) arranged behind the nose of the furnace or in a horizontal pass immediately downstream of the furnace for further superheating the steam before it leaves to a high pressure (HP) turbine. Steam exiting the HP turbine may be conducted back to the furnace for being re-superheated to the desired temperature in a reheater (RH). Steam, after being reheated, flows to the intermediate pressure (IP) turbine for further expansion. The RH is usually arranged in the horizontal pass downstream of the PSH, but it may, as well as the PSH for final superheating, in some cases, also be arranged as a radiant superheater at the top portion of the furnace.
Due to high flame temperature in the furnace, the durability of superheaters may suffer from overheating. German Patent No. 1012614 discloses an arrangement in which the tubes of a superheater are protected from overheating by special shield tubes leading steam to a convective superheater. Great Britain Patent No. 855,114 discloses a boiler having superheater tubes, closest to the flame in the furnace, protected from radiation by reheater tubes surrounding the superheater tubes. It is also known from U.S. Pat. No. 3,101,698 to make a platen superheater behind a furnace nose, in which third and fourth passes are arranged partially in parallel flow (i.e., so that horizontal radiation is directed to tubes of a third pass, which are in flue gas flow upstream of the fourth pass, to prevent overheating of the hotter outlet tube sections).
The above-mentioned prior art solutions may adversely alter the heat duty among the superheating stages, and thus, lower the thermal efficiency of the boiler, or they address primarily convective dominant heat transfer. Therefore, there still exists a need for an improved superheater.
A superheater may include a composite heating element that includes sidewall-functionalized carbon nanotubes. The superheater may further include a positive electrical connection and a negative electrical connection, wherein the positive electrical connection and the negative electrical connection are configured to connect the sidewall-functionalized carbon nanotubes to an electric power source.
In another embodiment, a superheater may include a composite heating element that includes carbon nanotubes. The superheater may further include a positive electrical connection and a negative electrical connection, wherein the positive electrical connection and the negative electrical connection are configured to connect the carbon nanotubes to an electric power source.
In a further embodiment, a superheater may include a heating element that includes carbon nanotubes. The superheater may further include a positive electrical connection and a negative electrical connection, wherein the positive electrical connection and the negative electrical connection are configured to connect the carbon nanotubes to an electric power source.
Superheaters are provided that may include carbon nanotubes. A superheater of the present disclosure may be a device used to convert saturated steam or wet steam into superheated steam or dry steam. Superheaters of the present disclosure may be used in steam engines or in processes, such as steam reforming. The superheaters of the present disclosure may be either radiant or convection. A superheater may vary in size from a few tens of feet to several hundred feet (a few metres to some hundred metres).
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For example, electro-thermal nanotubes may be held in suspension within a urethane base. The electro-thermal nanotubes may be microscopic fibers of carbon that may conduct electricity, convert electricity into thermal energy, and are very durable. When energized, the nanotubes may act as resistive heating elements that heat up as electrical energy flows through, and may increase in temperature as the electrical energy increases, thereby, the nanotube coating may function as a radiant heat source. The electro-thermal nanotubes may work with either alternating current (AC) or direct current (DC) electrical sources and temperature control may be achieved using off the shelf technology. A nanotube/urethane composite may be used as a spray on thermal coating that may convert a surface, on to which the composite is sprayed, into a radiant heat source.
While composite heating elements including carbon nanotubes are described herein in conjunction with superheaters in steam applications, the composite heating elements may be incorporated into numerous applications (e.g., heating asphalt, heating concrete, heating airplane wings and fuselages, water heaters, air heating, heating batteries, heated food containers, heated drink containers, etc.). In fact, the composite heating elements of the present disclosure may generally be incorporated in any convection, conduction or radiant heating application.
Turning to
A superheater 26 may include one or more substantially planar, in parallel connected superheating elements 32, each of which may include a first vertical pass 34, a first connection pass 36, a second vertical pass 38, a third vertical pass 40, a second connection pass 42 and a fourth vertical pass 44. The first connection pass 36 and the second connection pass 42 may be horizontal. Alternatively or additionally, first connection pass 36 and the second connection pass 42 may be of another form, for example, half-circles. Steam to be superheated in the superheater 26 may be conducted, usually, from a convection superheater (not shown), along a feed pipe 46 to an inlet header 48, which is arranged at the upper end of the first vertical pass 34. Correspondingly, heated steam may be conducted via an outlet header 50, arranged at the upper end of the fourth vertical pass 44, along a discharge pipe 52 to the next stage. The next stage may be a finishing superheater 30 or, if the superheater 26 is a finishing superheater, a steam turbine (not shown). Normally, the steam turbine may be a high pressure steam turbine, but when the superheater 26 is a reheater, the steam turbine may be an intermediate pressure steam turbine.
From the inlet header 48 of the superheater 26, the steam to be superheated may be distributed to multiple parallel steam tubes 54 running as U-tubes through the first vertical pass 34, the first connection pass 36 and the second vertical pass 38 to an intermediate header, a so-called first header 56, arranged at the upper end of the second vertical pass 38. From the first header 56, the steam flows via a connecting pipe 58 to a second header 60 arranged at the upper end of the third vertical pass 40. The connecting pipe 58 may include a water attemperator 62, by which it is possible to adjust the temperature of the steam to a desired level before it enters the third vertical pass 40. The superheating system may comprise further water attemperators 64 upstream or downstream of the radiant superheater 26. From the second header 60 of the radiant superheater 26, the steam is again distributed to multiple parallel steam tubes 66 running as U-tubes through the third vertical pass 40, the second connection pass 42 and the fourth vertical pass 44, to the outlet header 50.
The second connection pass 42 may be arranged above the first connection pass 36, so that the first connection pass 36 may shield the second connection pass 42 from radiation from the lower portion of the furnace 12. The first vertical pass 34 and the second vertical pass 38 may be correspondingly arranged to surround the fourth vertical pass 44 and the third vertical pass 40.
With referenced to
Turning to
With reference to
Turning to
The thermally insulating material 530 may be fiberglass, mineral wool, cellulose, polyurethane foam, polystyrene, aerogel (used by NASA for the construction of heat resistant tiles, capable of withstanding heat up to approximately 2000 degrees Fahrenheit with little or no heat transfer), natural fibers (e.g., hemp, sheep's wool, cotton, straw, etc.), polyisocyanurate, or polyurethane.
A heating element 26, 30, 32, 200, 300, 400, 500 may include sidewall-functionalized carbon nanotubes. The functionalized carbon nanotubes may include hydroxyl-terminated moieties covalently attached to their sidewalls. Methods of forming the functionalized carbon nanotubes may involve chemistry on carbon nanotubes that have first been fluorinated. In some embodiments, fluorinated carbon nanotubes (“fluoronanotubes”) may be reacted with mono-metal salts of a dialcohol, MO—R—OH. M may be a metal and R may be a hydrocarbon or other organic chain and/or ring structural unit. In such embodiments, —O—R—OH may displace —F on the associated nanotube, the fluorine may leave as MF. Generally, such mono-metal salts may be formed in situ by addition of MOH to one or more dialcohols in which the fluoronanotubes have been dispersed. Fluoronanotubes may be reacted with amino alcohols, such as being of the type H2N—R—OH, wherein —N(H)—R—OH displaces —F on the nanotube, the fluorine may leave as HF.
A heating element 26, 30, 32, 200, 300, 400, 500 may include carbon nanotubes integrated into an epoxy polymer composite via, for example, chemical functionalization of the carbon nanotubes. Integration of the carbon nanotubes into an epoxy polymer may be enhanced through dispersion and/or covalent bonding with an epoxy matrix during a curing process. In general, attachment of chemical moieties (i.e., functional groups) to a sidewall and/or end-cap of carbon nanotubes such that the chemical moieties may react with either epoxy precursor, a curing agent, or both during the curing process. Additionally, chemical moieties can function to facilitate dispersion of carbon nanotubes with an epoxy matrix by decreasing van der Waals attractive forces between the nanotubes.
A heating element 26, 30, 32, 200, 300, 400, 500 may include a carbon nanotube carpet that may include a resistance of a nanotube, and/or the nanotube carpet, of between about 0.1 kΩ and about 10.0 kΩ. Instead, the resistance of a nanotube may be between about 2.0 kΩ and about 8.0 kΩ. As an another alternative, the resistance of a nanotube may be between about 3.0 kΩ and about 7.0 kΩ. A conductive layer/contact may include single or dual damascene copper interconnects, poly-silicon interconnects, silicides, nitrides, and refractory metal interconnects such as, but not limited to, Al, Ti, Ta, Ru, W, Nb, Zr, Hf, Ir, La, Ni, Co, Au, Pt, Rh, Mo, and their combinations. An insulating material or materials may be coated onto individual tubes and/or bundles of tubes (nanotubes) to isolate the tubes and/or bundles from a conductive material. An insulating material may completely cover the tubes and/or bundles. Alternatively, gaps or other discontinuities may be included in the insulating material such that the nanotubes and/or bundles of nanotubes are not completely covered. The insulating material may include polymeric, oxide materials, and/or the like.
A heating element 26, 30, 32, 200, 300, 400, 500 may be at least partially formed on a liquid and/or gas heater tank and/or associated piping by spraying a carbon nanotube/epoxy solution onto a fabric as described herein and within the patents and patent applications that are incorporated herein by reference. The resulting heating element 26, 30, 32, 200, 300, 400, 500 may be on an outside of the tank and/or piping, an inside surface of the tank and/or piping, or may be sandwiched between two or more pieces of the tank and/or piping.
Although exemplary embodiments of the invention have been explained in relation to its preferred embodiment(s) as mentioned above, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the present invention. It is, therefore, contemplated that the appended claim or claims will cover such modifications and variations that fall within the true scope of the invention.
