CN213450530U - Heating system for realizing activation of purified molecular sieve by utilizing high-temperature water supply of thermal power generating unit - Google Patents
Heating system for realizing activation of purified molecular sieve by utilizing high-temperature water supply of thermal power generating unit Download PDFInfo
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- CN213450530U CN213450530U CN202022428992.1U CN202022428992U CN213450530U CN 213450530 U CN213450530 U CN 213450530U CN 202022428992 U CN202022428992 U CN 202022428992U CN 213450530 U CN213450530 U CN 213450530U
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Abstract
The utility model discloses a heating system for realizing the activation of a purified molecular sieve by utilizing high-temperature water supply of a thermal power generating unit, wherein a low-pressure cylinder steam exhaust port of the coal-fired power generating unit is sequentially connected with a low-pressure heater group and a plurality of high-pressure heaters, and part of steam is respectively led out from the outlet of each high-pressure heater to be used as a heat source of an air purification molecular sieve activation system; the air purification molecular sieve activation system is connected with the liquid compressed air energy storage system and used for removing moisture, carbon dioxide and impurities in the air. The utility model discloses add fan and wind channel and establish forced mechanical ventilation system, add water supply pipe and valve control system, according to the high temperature feedwater entering finned heat exchanger that different positions were introduced respectively to thermal power unit electrical load height, the air current gets into the air purification molecular sieve after the finned heat exchanger heaies up, makes its activation. Compare with traditional electric heating mode, the utility model provides a heating method system is simple, and variable operating mode strong adaptability reduces the operation energy consumption cost.
Description
[ technical field ] A method for producing a semiconductor device
The utility model belongs to the technical field of the power transmission in the aspect of the energy storage, a heating system who utilizes thermal power generating unit high temperature to feed water and realize the activation of purification molecular sieve is related to.
[ background of the invention ]
By 2019, the cumulative installed capacities of photovoltaic power and wind power respectively reach 2.05 hundred million kilowatts and 2.1 hundred million kilowatts, and account for 10.2 percent and 10.4 percent of the total installed capacity (20.1 hundred million kilowatts); the total annual energy production reaches 2243 and 4057 hundred million kilowatts, which account for 3 percent and 5.5 percent of the total annual energy production (73253 hundred million kilowatts). New energy power is rapidly developed in the future, and the thermal power generating unit is required to further excavate the peak regulation potential on the current basis. The renewable energy source electric energy with the characteristics of volatility and intermittence is connected to the power grid on a large scale, and higher requirements are provided for peak clipping, valley filling, safety and stability of the power grid. The construction of large-scale energy storage devices improves the operation flexibility and safety of the power system, and is an effective way for solving the problem of high-proportion consumption of new energy.
At present, the energy storage technology mainly comprises pumped storage, compressed air storage and electrochemical storage. The pumped storage technology is mature, the efficiency is high, but the problems of geographical position limitation and the like exist, and the large-scale popularization is difficult; the electrochemical battery energy storage technology has the advantages of fast response, small volume and short construction period, but has the defects of short overall service life, large industrial pollution and the like. The liquid compressed air energy storage technology has the characteristics of long service life, small environmental pollution, low operation and maintenance cost and the like, and has large-scale popularization and application potential.
The air purification molecular sieve is one of key equipment of a liquid compressed air energy storage system coupled with a thermal power generating unit, is used for adsorbing moisture, carbon dioxide, acetylene and the like in purified air, is vertically arranged, and mainly comprises a molecular sieve adsorption tank (one time in one transportation), heating equipment, related auxiliary pipelines, valves and the like. In the energy storage stage, high-pressure air enters a molecular sieve for adsorption; in the energy release stage, the molecular sieve releases pressure to normal pressure, the air is subjected to high-temperature air hot blowing treatment by the electric heater, the adsorption capacity in the adsorption tank is reduced, and therefore impurities such as water drops, carbon dioxide and acetylene adsorbed on the molecular sieve are released and discharged to the atmosphere along with hot blowing airflow and subsequent cold blowing airflow, and the purified molecular sieve is activated to be used in the next energy storage stage.
At present, the most common 'activation' mode is an electric heating mode, namely, a set of electric heating equipment is arranged, and air enters the molecular sieve hot blowing treatment after being heated by the electric heating equipment. The mode adopts electric power as an 'activation' heat source, and the system is simple, but has the defects of high energy consumption and the like.
[ Utility model ] content
An object of the utility model is to solve the problem among the prior art, provide an utilize thermal power generating unit high temperature to feed water and realize the heating system of purification molecular sieve activation.
In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:
utilize thermal power generating unit high temperature to feed water and realize purification molecular sieve activated heating system, include:
the low-pressure cylinder steam outlet of the coal-fired generator set is sequentially connected with a low-pressure heater group and three high-pressure heaters, and part of feed water is led out from the outlet of each high-pressure heater to be used as a heat source of an air purification molecular sieve activation system;
the air purification molecular sieve activation system is connected with the liquid compressed air energy storage system and is used for removing moisture, carbon dioxide and other impurities in the air; the outlet of the liquid compressed air energy storage system is connected with the liquid compressed air energy release system;
the liquid compressed air energy release system is characterized in that exhaust of the liquid compressed air energy release system is divided into two paths, one path of exhaust is discharged into the atmosphere, and the other path of exhaust is used as pure air to enter an air purification molecular sieve activation system.
The utility model discloses further improvement lies in:
the coal-fired power generating unit comprises a boiler, wherein a new steam outlet of the boiler is connected with a steam inlet of a high-pressure cylinder, a steam outlet of the high-pressure cylinder is connected with an inlet of a reheater of the boiler, an outlet of the reheater of the boiler is connected with a steam inlet of a medium-pressure cylinder, a steam outlet of the medium-pressure cylinder is connected with a steam inlet of a low-pressure cylinder, and the steam outlet of the low-pressure cylinder is sequentially connected with a condenser, a condensate pump, a low-pressure heater group, a water feed pump group, a No. 3 high-pressure heater, a No. 2 high-pressure heater; the outlet of the No. 1 high-pressure heater is connected with a boiler; the high-pressure cylinder, the intermediate-pressure cylinder and the low-pressure cylinder are coaxially connected and drive the generator to generate electricity together.
The air purification molecular sieve activation system comprises a water-gas heat exchanger and an air purification molecular sieve; the hot side of the water-gas heat exchanger is connected with a closed circulating water system; the inlet of the air purification molecular sieve is connected with an air cooler of a liquid compressed air energy storage system, and the outlet of the air purification molecular sieve is connected with a refrigeration expander; the heat source of the air purification molecular sieve is from outlet feed water of a No. 3 high-pressure heater, a No. 2 high-pressure heater and a No. 1 high-pressure heater.
And one part of the exhaust gas of the liquid compressed air energy release system is discharged to the atmosphere, the other part of the exhaust gas enters a fan, an outlet of the fan is connected with a cold side inlet of the water-gas heat exchanger through a cold air pipe, and a cold side outlet of the water-gas heat exchanger is connected with the air purification molecular sieve through a hot air pipe to supply heat for the air purification molecular sieve.
The high-pressure heater is led out to a water supply pipeline of the air purification molecular sieve activation system and is respectively provided with a valve group.
The liquid compressed air energy storage system comprises an air compressor, an outlet of the air compressor is connected with an air cooler, an outlet of the air cooler is connected with an air purification molecular sieve activation system, an outlet of the air purification molecular sieve activation system is sequentially connected with a refrigeration expansion machine and a gas-liquid separator, a liquid outlet of the gas-liquid separator is connected with an inlet of a liquefied air storage device, and an outlet of the liquefied air storage device is connected with a liquid compressed air energy release system.
The liquid compressed air energy release system comprises a booster pump, wherein the inlet of the booster pump is connected with the outlet of the liquefied air storage device, and the outlet of the booster pump is sequentially connected with an air heater and an air expansion generator.
Compared with the prior art, the utility model discloses following beneficial effect has:
the utility model discloses add fan and wind channel and establish forced mechanical ventilation system, add water supply pipe and valve control system, according to the high temperature feedwater entering finned heat exchanger that different positions were introduced respectively to thermal power unit electrical load height, the air current gets into the air purification molecular sieve after the finned heat exchanger heaies up, makes its activation. Compare with traditional electric heating mode, the utility model provides a heating method system is simple, and variable operating mode strong adaptability reduces the operation energy consumption cost.
[ description of the drawings ]
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic diagram of the system of the present invention.
The system comprises a boiler 1, a high-pressure cylinder 2, a medium-pressure cylinder 3, a low-pressure cylinder 4, a generator 5, a condenser 6, a condensate pump 7, a low-pressure heater group 8, a water feed pump 9, a high-pressure heater 10-3, a high-pressure heater 11-2, a high-pressure heater 12-1, a valve group 13, a fan 14, a water-gas heat exchanger 15, an air compressor 16, an air cooler 17, an air purification molecular sieve 18, a refrigeration expander 19, a gas-liquid separator 20, a liquefied air storage device 21, a booster pump 22, an air heater 23 and an air expansion generator 24.
[ detailed description ] embodiments
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention, as generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the accompanying drawings, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the embodiments of the present invention, it should be noted that, if the terms "upper", "lower", "horizontal", "inner", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship that the product of the present invention is usually placed when in use, the description is only for convenience of description and simplification, but the indication or suggestion that the device or element to be referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be interpreted as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the embodiments of the present invention, it should be further noted that unless explicitly stated or limited otherwise, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.
The present invention will be described in further detail with reference to the accompanying drawings:
referring to fig. 1, the utility model discloses utilize thermal power generating unit high temperature to feed water and realize the heating system of purification molecular sieve activation, including coal-fired generating set soda thermal cycle system, liquid compressed air energy storage system, liquid compressed air energy release system and air purification molecular sieve activation system.
The coal-fired generating set comprises a boiler 1, wherein a new steam outlet of the boiler 1 is connected with a steam inlet of a high-pressure cylinder 2, a steam outlet of the high-pressure cylinder 2 is connected with an inlet of a reheater of the boiler 1, a reheater outlet of the boiler 1 is connected with a steam inlet of a medium-pressure cylinder 3, a steam outlet of the medium-pressure cylinder 3 is connected with a steam inlet of a low-pressure cylinder 4, and a steam outlet of the low-pressure cylinder 4 is sequentially connected with a condenser 6, a condensate pump 7, a low-pressure heater group 8, a water feed pump group 9, a No. 3 high-pressure heater 10, a No. 2 high-pressure heater 11 and; the outlet of the No. 1 high-pressure heater 12 is connected with the boiler 1; the high pressure cylinder 2, the intermediate pressure cylinder 3 and the low pressure cylinder 4 are coaxially connected and drive a generator 5 to generate electricity together. Part of feed water is led out from the outlet of each high-pressure heater to be used as a heat source of an air purification molecular sieve activation system; the high-pressure heater is led out to a water supply pipeline of the air purification molecular sieve activation system and is respectively provided with a valve group 13.
The air purification molecular sieve activation system comprises a water-gas heat exchanger 15 and an air purification molecular sieve 18; the hot side of the water-gas heat exchanger 15 is connected with a closed circulating water system; the inlet of the air purification molecular sieve 18 is connected with an air cooler 17 of a liquid compressed air energy storage system, and the outlet is connected with a refrigeration expander 19; the heat source for air purification molecular sieve 18 is from the outlet feed water of number 3 high pressure heater 10, number 2 high pressure heater 11 and number 1 high pressure heater 12. The air purification molecular sieve activation system is connected with the liquid compressed air energy storage system and is used for removing moisture, carbon dioxide and other impurities in the air; the outlet of the liquid compressed air energy storage system is connected with the liquid compressed air energy release system;
the liquid compressed air energy storage system comprises an air compressor 16, an outlet of the air compressor 16 is connected with an air cooler 17, an outlet of the air cooler 17 is connected with an air purification molecular sieve activation system, an outlet of the air purification molecular sieve activation system is sequentially connected with a refrigeration expander 19 and a gas-liquid separator 20, a liquid outlet of the gas-liquid separator 20 is connected with an inlet of a liquefied air storage device 21, and an outlet of the liquefied air storage device 21 is connected with a liquid compressed air energy release system.
The liquid compressed air energy release system comprises a booster pump 22, wherein an inlet of the booster pump 22 is connected with an outlet of the liquefied air storage device 21, and an outlet of the booster pump 22 is sequentially connected with an air heater 23 and an air expansion generator 24. One part of the exhaust gas of the air expansion generator 24 is discharged to the atmosphere, the other part enters the fan 14, the outlet of the fan 14 is connected with the cold-side inlet of the water-gas heat exchanger 15 through a cold air pipe 25, and the cold-side outlet of the water-gas heat exchanger 15 is connected with the air purification molecular sieve 18 through a hot air pipe 26 to supply heat for the air purification molecular sieve. The exhaust of the liquid compressed air energy release system is divided into two paths, one path is exhausted into the atmospheric environment, and the other path is used as pure air to enter an air purification molecular sieve activation system.
The utility model discloses a working process:
the new steam at the outlet of the boiler 1 sequentially passes through a high-pressure cylinder 2 of a steam turbine to do work and then returns to a reheater of the boiler 1 to be heated for the second time, then enters an intermediate-pressure cylinder 3 and a low-pressure cylinder 4 to do work to drive a generator 5 to generate power, the exhaust steam of the low-pressure cylinder 4 enters a condenser 6 to be condensed, sequentially flows through a condensate pump 7, a low-pressure heater group 8, a feed water pump group 9, a No. 3 high-pressure heater 10, a No. 2 high-pressure heater 11 and a No. 1 high-pressure heater 12 to enter the boiler.
The energy storage process of the system is as follows: the air is pressurized by a compressor 16, enters an air cooler 17 for cooling, enters a purified molecular sieve 18 for removing impurities such as moisture, carbon dioxide and the like, then enters a refrigeration expander 19 for realizing deep cooling, liquid and gaseous separation of the air is realized in a gas-liquid separator 20, and the liquid enters a storage device 21, which is the process of liquefying, compressing and storing energy of the air.
Energy release process of the system: the booster pump 22 at the outlet of the liquefied air storage device 21 pressurizes, the temperature of the pressurized air is raised by the air heater 23, the pressurized air enters the air expansion generator 24 to do work, the exhaust is divided into two paths, one path is exhausted into the atmospheric environment, and the other path is used as pure air and enters the air purification molecular sieve activation system.
Taking a 300 MW-grade thermal power generating unit as an example, the water supply temperatures of the outlets of the THA electric load No. 1, No. 2 and No. 3 high-pressure heaters and the water supply pump are 284 ℃, 264 ℃, 221 ℃ and 187.6 ℃ respectively; the 75% THA electrical loads were 264 deg.C, 246 deg.C, 206 deg.C and 174 deg.C, respectively; the 50% THA electrical loads were 240 deg.C, 224 deg.C, 188 deg.C and 158 deg.C, respectively; the 30% THA electrical loads were 216 deg.C, 200 deg.C, 168 deg.C and 141 deg.C, respectively.
The principle of the utility model is as follows:
the utility model discloses set up the tee bend at the water supply line of 1 high pressure feed water heater 12, 2 high pressure feed water heater 11, 3 high pressure feed water heater 10 and the 9 exports of feed pump respectively, draw part separately and supply water to female pipe, each branch pipe sets up valve group 13, and high temperature feedwater gets into and enters into gas-water heat exchanger 15 as the heat source, and this heat exchanger adopts the tubular heat transfer structure of fin intensive heat transfer, lets in high temperature hot water in the pipe. And a part of the exhaust air of the air expansion generator 24 enters the fan 14 through the air pipe, is pressurized and then passes through the air-water heat exchanger 15 to realize temperature rise, and high-temperature air enters the air purification molecular sieve 18 to be subjected to hot blowing treatment and then is exhausted to the atmospheric environment. And cold water at the outlet of the gas-water heat exchanger 15 enters the outlet of the condensate pump of the thermal power generating unit again to complete circulation. In addition, in order to enhance the heat exchange effect, the flow direction of the feed water and the air is set in a counter flow mode.
Furthermore, from the angle of "energy is to mouthful, the step utilizes", the utility model discloses set up 4 kinds of heat sources, be 1 high pressure feed water heater 12, 2 high pressure feed water heater 11, 3 high pressure feed water heater 10 and the export of feed water pump 9 respectively, 4 kinds of heat sources realize switching through the switch of control valve group 13, and the dependent variable is thermal power unit electric load. The appointed switching mode is as follows:
the electric load of the thermal power generating unit is less than or equal to 30 percent THA, and the heat source is water supplied from the outlet of a No. 1 high-pressure heater 12.
And the THA is less than 30% and less than or equal to 50% of the THA of the thermal power generating unit, and the heat source is the water supplied from the outlet of the No. 2 high-pressure heater 11.
Thirdly, 50 percent THA is less than the electrical load of the thermal power generating unit and less than or equal to 75 percent THA, and the heat source is the water supply at the outlet of the No. 3 high-pressure heater 10.
Fourthly, 75 percent THA is less than the electrical load of the thermal power generating unit, and the heat source is the outlet of the water feeding pump 9.
The 'activation' system of the air purification molecular sieve requires that the temperature of hot air is not lower than 170 ℃. Taking a 10MW liquid compressed air energy storage system as an example, the air amount is 21000Nm3/h, the inlet air temperature is about 20 ℃, and the required heat load is about 1.4 MW.
Taking a 300 MW-grade thermal power generating unit as an example, the water supply temperatures of the outlets of the THA electric load No. 1, No. 2 and No. 3 high-pressure heaters and the water supply pump are 284 ℃, 264 ℃, 221 ℃ and 187.6 ℃ respectively; the 75% THA electrical loads were 264 deg.C, 246 deg.C, 206 deg.C and 174 deg.C, respectively; the 50% THA electrical loads were 240 deg.C, 224 deg.C, 188 deg.C and 158 deg.C, respectively; the 30% THA electrical loads were 216 deg.C, 200 deg.C, 168 deg.C and 141 deg.C, respectively.
Considering the heat transfer end difference of the gas-water heat exchanger, the water supply temperature of the thermal power generating unit under the wide-load variable working condition can still meet the heat source temperature requirement of the purified molecular sieve activation.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. Utilize thermal power generating unit high temperature to feed water and realize purification molecular sieve activated heating system, its characterized in that includes:
the steam exhaust port of a low-pressure cylinder (4) of the coal-fired generator set is sequentially connected with a low-pressure heater group (8) and three high-pressure heaters, and part of feed water is led out from the outlet of each high-pressure heater to be used as a heat source of an air purification molecular sieve activation system;
the air purification molecular sieve activation system is connected with the liquid compressed air energy storage system and is used for removing moisture, carbon dioxide and other impurities in the air; the outlet of the liquid compressed air energy storage system is connected with the liquid compressed air energy release system;
the liquid compressed air energy release system is characterized in that exhaust of the liquid compressed air energy release system is divided into two paths, one path of exhaust is discharged into the atmosphere, and the other path of exhaust is used as pure air to enter an air purification molecular sieve activation system.
2. The heating system for realizing activation of the purified molecular sieve by utilizing high-temperature feed water of a thermal power generating unit according to claim 1, characterized in that the coal-fired power generating unit comprises a boiler (1), a new steam outlet of the boiler (1) is connected with a steam inlet of a high-pressure cylinder (2), a steam outlet of the high-pressure cylinder (2) is connected with an inlet of a reheater of the boiler (1), an outlet of the reheater of the boiler (1) is connected with a steam inlet of a medium-pressure cylinder (3), a steam outlet of the medium-pressure cylinder (3) is connected with a steam inlet of a low-pressure cylinder (4), and the steam outlet of the low-pressure cylinder (4) is sequentially connected with a condenser (6), a condensate pump (7), a low-pressure heater group (8), a feed water pump group (9), a high-pressure heater (10) No. 3, a high-pressure heater (11); the outlet of the No. 1 high-pressure heater (12) is connected with the boiler (1); the high pressure cylinder (2), the intermediate pressure cylinder (3) and the low pressure cylinder (4) are coaxially connected and drive the generator (5) to generate electricity together.
3. The heating system for realizing activation of the purified molecular sieve by utilizing the high-temperature feedwater of the thermal power generating unit as claimed in claim 2, wherein the air purification molecular sieve activation system comprises a water-gas heat exchanger (15) and an air purification molecular sieve (18); the hot side of the water-gas heat exchanger (15) is connected with a closed circulating water system; the inlet of the air purification molecular sieve (18) is connected with an air cooler (17) of a liquid compressed air energy storage system, and the outlet is connected with a refrigeration expander (19); the heat source of the air purification molecular sieve (18) is from outlet feed water of a No. 3 high-pressure heater (10), a No. 2 high-pressure heater (11) and a No. 1 high-pressure heater (12).
4. The heating system for realizing activation of the purified molecular sieve by utilizing high-temperature feedwater of a thermal power generating unit as claimed in claim 3, wherein a part of exhaust gas of the liquid compressed air energy release system is discharged to the atmosphere, and the other part of the exhaust gas enters the fan (14), the outlet of the fan (14) is connected with the cold side inlet of the water-gas heat exchanger (15) through a cold air pipe (25), and the cold side outlet of the water-gas heat exchanger (15) is connected with the air purified molecular sieve (18) through a hot air pipe (26) to supply heat to the air purified molecular sieve.
5. The heating system for realizing the activation of the purified molecular sieve by utilizing the high-temperature feedwater of the thermal power generating unit as claimed in claim 1 or 2, wherein the high-pressure heater is led out to a feedwater pipeline of the air purification molecular sieve activation system, and a valve group (13) is respectively arranged on the feedwater pipeline.
6. The heating system for realizing activation of the purified molecular sieve by utilizing high-temperature feedwater of a thermal power generating unit as claimed in claim 1, wherein the liquid compressed air energy storage system comprises an air compressor (16), an outlet of the air compressor (16) is connected with an air cooler (17), an outlet of the air cooler (17) is connected with an air purification molecular sieve activation system, an outlet of the air purification molecular sieve activation system is sequentially connected with a refrigeration expander (19) and a gas-liquid separator (20), a liquid outlet of the gas-liquid separator (20) is connected with an inlet of a liquefied air storage device (21), and an outlet of the liquefied air storage device (21) is connected with a liquid compressed air energy release system.
7. The heating system for realizing activation of the purified molecular sieve by utilizing the high-temperature feedwater of the thermal power generating unit as claimed in claim 6, wherein the liquid compressed air energy release system comprises a booster pump (22), an inlet of the booster pump (22) is connected with an outlet of the liquefied air storage device (21), and an outlet of the booster pump (22) is sequentially connected with an air heater (23) and an air expansion generator (24).
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