CN114427484B - A Direct Air Cooling System Utilizing Ammonia Cooling Energy in Ammonia Doped Power Plant - Google Patents

Abstract

The invention provides a direct air cooling system utilizing ammonia cold energy in an ammonia-doped power plant, which belongs to the field of power station cooling, and comprises an exhaust steam condensing chamber, an exhaust steam distribution pipe, a liquid ammonia distribution pipe, a drain pipe, a condensation water tank, a direct cooling tower and an ammonia buffer tank, wherein the exhaust steam condensing chamber is provided with a liquid ammonia inlet and an exhaust steam inlet, and a liquid ammonia channel is also arranged in the exhaust steam condensing chamber; meanwhile, the outlet of the steam exhaust condensing chamber is respectively connected with a steam exhaust distribution pipe, a liquid ammonia distribution pipe and a drain pipe; each cooling unit in the direct cooling tower comprises an exhaust steam tube bundle and a liquid ammonia tube bundle for introducing exhaust steam and liquid ammonia, and each cooling unit is connected with a condensate pipe and an ammonia pipe; and meanwhile, the axial flow fan is arranged below the direct cooling tower and cools the exhausted steam through air heat exchange. The invention realizes twice heat exchange of exhaust steam and liquid ammonia, can reduce the outlet back pressure of the steam turbine, reduce the coal consumption rate, reduce the load of the direct cooling tower, further reduce the running number of the axial flow fan, and reduce the rotating speed of the axial flow fan so as to reduce the noise and the power consumption of a plant.

Description

A Direct Air Cooling System Utilizing Ammonia Cooling Energy in Ammonia Doped Power Plant

technical field

The invention belongs to the field of power station cooling, and more specifically relates to a direct air cooling system using ammonia cooling energy in an ammonia-doped power plant.

Background technique

Northwest China is rich in coal and has a large number of coal-fired power plants. However, due to the shortage of water resources, it is impossible to use water cooling to cool the exhaust steam of steam turbines. Therefore, air cooling technology is widely used in power plants in Northwest China. The air-cooling system is divided into direct air-cooling system and indirect air-cooling system. The direct air-cooling system means that the exhaust steam of the steam turbine passes through the thick exhaust pipe to the outdoor air-cooled condenser, and the axial flow cooling fan makes the air flow through the outer surface of the heat exchanger. The exhaust steam is condensed into water, and the condensed water is pumped back to the boiler. However, since the cooling limit of the air-cooling system is the ambient dry bulb temperature, which is higher than the cooling limit (wet bulb temperature) of the water-cooling unit, the back pressure of the air-cooling unit is relatively high, resulting in higher coal consumption and poor operating economy. In addition, the direct air cooling system requires axial flow fans for forced ventilation, which has the disadvantages of high noise and high power consumption.

Northwest China is rich in renewable resources such as wind energy and solar energy, and has sufficient power resources for the production of synthetic ammonia, so it is very suitable for ammonia-coal co-firing. After the combustion of ammonia mixed with coal-fired power plants, the amount of ammonia fuel required is huge, and ammonia is usually transported to the power plant in the form of liquid ammonia, and then gasified in the power plant. The latent heat of vaporization of liquid ammonia is large, and a large amount of cold energy will be released during the gasification process. In the existing flue gas denitrification technology, the commonly used methods for liquid ammonia gasification are electric heating and exhaust steam heating. However, after ammonia is used as fuel, its consumption in power plants will increase significantly. At this time, if the electric heating method is used, the power consumption of the plant will be seriously increased; while the exhaust steam heating method will seriously reduce the output of the steam turbine. At the same time, these cold energies are also a kind of resource, which should be used rationally.

Contents of the invention

Aiming at the defects of the prior art, the purpose of the present invention is to provide a direct air cooling system utilizing ammonia cooling energy in an ammonia-doped power plant, aiming at solving the problems of high noise, high plant power consumption and high steam turbine back pressure in the existing direct air cooling system question.

In order to achieve the above object, the present invention provides a direct air cooling system using ammonia cooling energy in an ammonia-doped power plant, the system includes an exhaust steam condensing chamber, an exhaust steam distribution pipe, a liquid ammonia distribution pipe, a drain pipe, a condensed water tank, a direct cooling A tower and an ammonia buffer tank, the exhaust steam condensing chamber is provided with a liquid ammonia inlet and an exhaust steam inlet, and the inside of the exhaust steam condensing chamber is also provided with a liquid ammonia channel, and the liquid ammonia inlet is connected with the liquid ammonia channel for passing through The exhaust steam inlet is used to feed exhaust steam into the exhaust steam condensing chamber; at the same time, the outlet of the exhaust steam condensing chamber is respectively connected with the exhaust steam distribution pipe, the liquid ammonia distribution pipe and the drain pipe. The steam and liquid ammonia conduct heat exchange for the first time in the exhaust steam condensing chamber. After heat exchange, the exhaust steam and liquid ammonia enter the direct cooling tower through the exhaust steam distribution pipe and the liquid ammonia distribution pipe respectively, and the condensed water enters through the drain pipe. condensate tank;

The direct cooling tower includes a preset number of cooling units, condensed water pipes, ammonia pipes and axial flow fans, each of which includes exhaust steam pipe bundles and liquid ammonia pipe bundles, which are respectively used to feed exhaust steam and liquid ammonia, And each of the cooling units is connected with the condensate pipe and the ammonia gas pipe, and the exhaust steam and liquefied ammonia that are introduced during work undergo a second heat exchange in the cooling unit, and the condensed water and ammonia gas generated pass through the condensate pipe and the ammonia gas respectively. The air pipe is sent to the condensed water tank and the ammonia buffer tank; at the same time, the axial flow fan is installed under the direct cooling tower to cool the exhaust steam by means of air convection heat exchange, thereby realizing direct air cooling using ammonia cooling energy.

As a further preference, the cooling unit includes three rows of tube bundles arranged in parallel, wherein the tube bundles on both sides are exhaust tube bundles, and the middle tube bundle is liquid ammonia tube bundle, so as to avoid frosting on the surface of the liquid ammonia tube bundle.

As a further preference, the flow directions of the exhaust steam tube bundle and the liquid ammonia tube bundle in the cooling unit are opposite.

As a further preference, the exhaust steam tube bundles and the liquid ammonia tube bundles are arranged alternately in the cooling unit.

As a further preference, the cooling unit includes a co-current cooling assembly and a counter-current cooling assembly, wherein the exhaust steam bundle of the co-current cooling assembly is a downstream tube bundle, the upper end of which is connected to the exhaust distribution pipe, and the lower end is connected to the condensate pipe, At the same time, the liquid ammonia tube bundle of the downstream cooling assembly is a countercurrent tube bundle, the upper end of which is connected to the ammonia gas pipe, and the lower end is connected to the liquid ammonia distribution pipe; The water pipes are connected, and the liquid ammonia tube bundle of the countercurrent cooling assembly is a downstream tube bundle, the upper end of which is connected with the ammonia gas pipe, and the lower end is sealed.

As a further preference, in the cooling unit, the co-current cooling components and the counter-current cooling components are arranged at intervals, and the number of the co-current cooling components is greater than the number of the counter-current cooling components.

According to another aspect of the present invention, an application of the above-mentioned direct air cooling system utilizing ammonia cooling energy in an ammonia-doped power plant is provided.

As a further preference, the liquid ammonia inlet is connected with the liquid ammonia storage tank through a liquid ammonia pump for feeding liquid ammonia; the exhaust steam inlet is connected with a steam turbine for feeding exhaust steam; A water pump is connected to the boiler to send condensed water into the boiler.

Generally speaking, compared with the prior art, the above technical solution conceived by the present invention has the following beneficial effects:

1. The present invention introduces the cold energy produced by the gasification of liquid ammonia into the direct air-cooling system, and uses the exhaust steam of the steam turbine to provide energy for the gasification of liquid ammonia, which can realize the comprehensive utilization of energy. At the same time, the present invention improves the structure of the direct air-cooling system , realizing two heat exchanges between exhaust steam and liquid ammonia, in which the exhaust steam performs the first heat exchange with liquid ammonia in the exhaust steam condensing chamber, which can reduce the back pressure at the outlet of the steam turbine, reduce the coal consumption rate, and reduce the load of the direct cooling tower , Improve the operating economy, and the exhaust steam performs a second heat exchange with liquid ammonia in the direct cooling tower, and is cooled under the forced heat exchange of the axial flow fan, which can reduce the impact of the direct cooling tower on the environment without being affected by the external environment The degree of sensitivity can alleviate the problem of the cooling capacity drop of the direct cooling tower in summer, and can further reduce the number of axial flow fans in operation and reduce the speed of the axial flow fans to reduce noise and plant power consumption;

2. In particular, the present invention improves the arrangement of the tube bundles in the cooling unit to form a "hot-cold-hot" tube bundle arrangement, which can avoid frosting on the outer surface of the liquid ammonia tube bundles and effectively improve the transmission of the liquid ammonia tube bundles. Thermal performance;

3. In addition, the present invention sets a downstream cooling assembly and a countercurrent cooling assembly in the cooling unit, wherein the downstream cooling assembly can exchange heat between exhaust steam and liquid ammonia, and the countercurrent cooling assembly can exchange exhaust steam in the condensate pipe with ammonia The liquid ammonia in the gas pipe performs heat exchange, thereby ensuring that the exhaust steam can be completely converted into condensed water, and the liquid ammonia can be completely converted into ammonia gas, effectively improving the cooling efficiency of the direct air cooling system.

Description of drawings

Fig. 1 is a schematic structural view of a direct air cooling system utilizing ammonia cooling energy in an ammonia-doped power plant provided by an embodiment of the present invention;

Fig. 2 is the left view of the direct air cooling system utilizing ammonia cooling energy in the ammonia-doped power plant provided by the embodiment of the present invention;

Fig. 3 is the sectional view of A-A direction in Fig. 1;

Fig. 4 is a schematic diagram of the application of a direct air cooling system using ammonia cooling energy in an ammonia-doped power plant provided by an embodiment of the present invention.

Throughout the drawings, the same reference numerals are used to designate the same elements or structures, wherein:

1-exhaust steam condensing chamber, 1.1-liquid ammonia inlet, 1.2-exhaust steam inlet, 2-direct cooling tower, 2.1-exhaust steam tube bundle, 2.2-liquid ammonia tube bundle, 3-drain pipe, 4-liquid ammonia distribution pipe, 5 -condensate tank, 6-condensate pipe, 7-axial fan, 8-exhaust steam distribution pipe, 9-ammonia pipe, 10-ammonia buffer tank, 11-liquid ammonia storage tank, 12-liquid ammonia pump, 13-drainage pump , 14-feed water pump, 15-boiler, 16-steam turbine.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

As shown in Fig. 1, the present invention provides a kind of direct air-cooling system utilizing ammonia cooling energy in the ammonia-doped power plant, and this system comprises exhaust steam condensing room 1, exhaust steam distribution pipe 8, liquid ammonia distribution pipe 4, drain pipe 3, Condensed water tank 5, direct cooling tower 2 and ammonia buffer tank 10, exhaust steam condensing chamber 1 is provided with liquid ammonia inlet 1.1 and exhaust steam inlet 1.2, the inside of this exhaust steam condensing chamber 1 is also provided with liquid ammonia channel, liquid ammonia inlet 1.1 One end of it is connected with the liquid ammonia storage tank 11 through the liquid ammonia pump 12, and the other end is connected with the liquid ammonia channel for feeding liquid ammonia as a cold source, and the exhaust steam inlet 1.2 is connected with the steam turbine 16 for supplying the exhaust steam to the condensing chamber. 1 into the exhaust steam; at the same time, the outlet of the exhaust steam condensing chamber 1 is respectively connected with the exhaust steam distribution pipe 8, the liquid ammonia distribution pipe 4 and the drain pipe 3, and the exhaust steam and the liquid ammonia in the liquid ammonia channel are condensed in the exhaust steam during operation. The first heat exchange is carried out in chamber 1, the temperature of liquid ammonia rises, and part of the exhaust steam is condensed into condensed water. After heat exchange, the exhaust steam and liquid ammonia enter the direct cooling tower 2 through the exhaust steam distribution pipe 8 and the liquid ammonia distribution pipe 4 respectively. , the generated condensed water enters the condensed water tank 5 through the drain pipe 3; the exhaust steam of the steam turbine first exchanges heat with liquid ammonia in the exhaust steam condensing chamber, which can reduce the back pressure of the steam turbine outlet, reduce the coal consumption rate, and effectively improve the operation economy of the power plant sex;

The direct cooling tower 2 includes a preset number of cooling units, condensed water pipes 6, ammonia pipes 9 and axial flow fans 7, and each cooling unit includes an exhaust steam pipe bundle 2.1 and a liquid ammonia pipe bundle 2.2, which are respectively used for feeding exhaust steam and liquid ammonia. ammonia, and each cooling unit is connected to the condensed water pipe 6 and the ammonia gas pipe 9. When working, the exhaust steam and liquid ammonia that are introduced undergo a second heat exchange in the cooling unit, and the exhaust steam releases heat and condenses into condensed water and passes through the The condensed water pipe 6 enters the condensed water tank 5, and the liquid ammonia absorbs heat and vaporizes into ammonia gas and enters the ammonia buffer tank 10 through the ammonia air pipe 9; at the same time, the axial flow fan 7 is installed under the direct cooling tower 2 to exchange heat by air convection The exhaust steam is cooled to realize direct air cooling using ammonia cooling energy.

The present invention now cools a part of the exhaust steam in the exhaust steam condensing chamber 1, which reduces the load of the direct cooling tower 2 and can also solve the problem of excessive back pressure of the steam turbine 16 when the temperature is high in summer, insufficient output of the direct cooling tower 2 and liquid ammonia gas. It can reduce the coal consumption rate, improve the power generation efficiency and operation economy of the unit; at the same time, introducing liquid ammonia into the direct air cooling system can reduce the scale of the direct cooling tower 2 and the number of axial flow fans 7, thereby reducing noise and The power consumption of the plant saves a lot of construction costs and operating costs, improves the economic benefits of the power plant, and the supply of ammonia cooling energy is not affected by the external environment, which reduces the sensitivity of the direct cooling tower 2 to the environment, and can relieve direct cooling in summer. For the problem of cooling tower 2 cooling capacity decline, in winter, the rotational speed of the axial flow fan 7 can be further reduced or the operating quantity of the axial flow fan 7 can be reduced, so as to realize the comprehensive utilization of energy.

Further, as shown in Figures 2 and 3, the cooling unit includes three rows of tube bundles arranged in parallel, and is arranged in a "hot-cold-heat" staggered manner. The tube bundles on both sides are exhaust tube bundles 2.1, and the middle tube bundles are liquid ammonia. The tube bundle 2.2 can increase the temperature of the air flowing through the liquid ammonia tube bundle 2.2, and at the same time make the liquid ammonia tube bundle 2.2 receive the heat radiated by the surrounding exhaust steam tube bundle 2.1, which solves the problem of frosting on the surface of the liquid ammonia tube bundle 2.2. When working, the axial flow fan 7 makes the air flow from bottom to top. When the air flows through the lower exhaust steam tube bundle 2.1, the heat of the exhaust steam is taken away by the convection heat exchange. The cold energy released by the liquid ammonia tube bundle 2.2 lowers the air temperature, and finally the air continues to exchange heat with the upper exhaust steam tube bundle 2.1, and the air temperature rises and is discharged from the direct cooling tower 2, thereby realizing convective heat exchange. At the same time, the two rows of exhaust steam tube bundles 2.1 Heat exchange with the liquid ammonia tube bundle 2.2 in the middle also through radiation. In order to ensure heat exchange efficiency, the flow directions of the exhaust steam tube bundle 2.1 and the liquid ammonia tube bundle 2.2 in the cooling unit are opposite.

Further, the cooling unit includes a co-current cooling component and a counter-current cooling component, wherein the exhaust steam tube bundle 2.1 of the co-current cooling component is a co-current tube bank, the upper end of which is connected to the exhaust distribution pipe 8, and the lower end is connected to the condensed water pipe 6, and the co-current cooling The liquid ammonia tube bundle 2.2 of the component is a countercurrent tube bundle, the upper end of which is connected to the ammonia gas pipe 9, and the lower end is connected to the liquid ammonia distribution pipe 4. During operation, the exhaust steam distribution pipe 8 sends exhaust steam from the upper end of the exhaust steam pipe bundle 2.1, and the liquid ammonia distribution pipe 4. The liquid ammonia is fed from the liquid ammonia distribution pipe 4, and the heat is exchanged by means of air convection and radiation. The condensed water produced enters the condensed water tank 5 through the condensed water pipe 6, and the ammonia gas enters the ammonia buffer tank 10 through the ammonia gas pipe 9; reverse flow The exhaust steam tube bundle 2.1 of the cooling assembly is a countercurrent tube bundle, its upper end is sealed, and its lower end is connected to the condensate water pipe 6. Meanwhile, the liquid ammonia tube bundle 2.2 of the countercurrent cooling assembly is a downstream tube bundle, its upper end is connected to the ammonia gas pipe 9, and its lower end is sealed to allow condensation during operation. A small amount of uncondensed exhaust steam in the water pipe 6 enters from the lower end of the exhaust steam tube bundle 2.1, and a small amount of unvaporized liquid ammonia in the ammonia gas pipe 9 enters from the upper end of the liquid ammonia tube bundle 2.2, and conducts heat exchange through air convection and radiation to generate The condensed water enters the condensed water tank 5 through the condensed water pipe 6, and the ammonia gas enters the ammonia buffer tank 10 through the ammonia gas pipe 9, thereby ensuring that the exhaust steam and liquid ammonia are all converted into condensed water and ammonia gas.

Further, in the cooling unit, the forward flow cooling components and the counter flow cooling components are spaced apart, and the number of the forward flow cooling components is greater than the number of the counter flow cooling components.

As shown in Figure 4, according to another aspect of the present invention, the application of the above-mentioned direct air cooling system utilizing ammonia cooling energy in an ammonia-doped power plant is provided, wherein the liquid ammonia inlet 1.1 is connected with the liquid ammonia storage tank 11 through a liquid ammonia pump 12 , for feeding liquid ammonia; exhaust steam inlet 1.2 is connected with steam turbine 16 for feeding exhaust steam; The working process of the direct air cooling system in the ammonia-doped power plant is: the liquid ammonia in the liquid ammonia storage tank 11 is sent into the exhaust steam condensing chamber 1 by the liquid ammonia pump 12, and the exhaust steam of the steam turbine 16 enters the exhaust steam condensing chamber 1, and Liquid ammonia performs the first heat exchange, and part of the exhaust steam is first condensed into condensed water, which is sent to the condensed water tank 5 by the drain pump 13; the liquid ammonia and the remaining exhaust steam enter the direct cooling tower 2 for the second heat exchange, and the exhaust steam The condensed water is cooled and condensed and flows into the condensed water tank 5. The condensed water is transported by the feed water pump 14 to the boiler 15 to be heated into steam, and enters the steam turbine 16 to complete the cycle and generate exhaust steam, while the liquid ammonia absorbs heat and gasifies into ammonia gas and enters the ammonia buffer tank 10, in order to provide a continuous and stable ammonia source for combustion, and can also be used by the SCR system.

Since the latent heat of vaporization of liquid ammonia is 1332.9kJ/kg, in a 600MW generator set, when the ammonia doping ratio reaches 50%, about 8% of the exhaust steam from the steam turbine can be condensed; each unit is equipped with 56 axial flow fans, which is equivalent to 4.2 axial flow fans are reduced; each power is calculated as 110KW, and the annual utilization hours are 5500 hours, which can save the power of axial flow fans by about 2541MW each year, and the energy saving effect and economic benefits are obvious.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (8)

1. The direct air cooling system for utilizing ammonia cold energy in the ammonia-doped power plant is characterized by comprising an exhaust steam condensation chamber (1), an exhaust steam distribution pipe (8), a liquid ammonia distribution pipe (4), a drain pipe (3), a condensation water tank (5), a direct cooling tower (2) and an ammonia buffer tank (10), wherein the exhaust steam condensation chamber (1) is provided with a liquid ammonia inlet (1.1) and an exhaust steam inlet (1.2), a liquid ammonia channel is further arranged inside the exhaust steam condensation chamber (1), the liquid ammonia inlet (1.1) is connected with the liquid ammonia channel and used for introducing liquid ammonia, and the exhaust steam inlet (1.2) is used for introducing exhaust steam into the exhaust steam condensation chamber (1); meanwhile, an outlet of the steam exhaust condensation chamber (1) is respectively connected with a steam exhaust distribution pipe (8), a liquid ammonia distribution pipe (4) and a drain pipe (3), steam exhaust and liquid ammonia carry out primary heat exchange in the steam exhaust condensation chamber (1) during working, the steam exhaust and liquid ammonia after heat exchange respectively enter the direct cooling tower (2) through the steam exhaust distribution pipe (8) and the liquid ammonia distribution pipe (4), and generated condensed water enters a condensation water tank (5) through the drain pipe (3);

the direct cooling tower (2) comprises a preset number of cooling units, condensate pipes (6), ammonia pipes (9) and axial flow fans (7), each cooling unit comprises an exhaust pipe bundle (2.1) and a liquid ammonia pipe bundle (2.2) which are respectively used for introducing exhaust steam and liquid ammonia, each cooling unit is connected with the condensate pipe (6) and the ammonia pipe (9), the exhaust steam and the liquid ammonia introduced during working perform secondary heat exchange in the cooling units, and the generated condensate water and ammonia are respectively sent into a condensate tank (5) and an ammonia buffer tank (10) through the condensate pipes (6) and the ammonia pipes (9); and meanwhile, the axial flow fan (7) is arranged below the direct cooling tower (2) to cool the exhausted steam in a mode of air convection heat exchange, so that direct air cooling by utilizing ammonia cooling energy is realized.

2. The direct air cooling system for ammonia cooling energy utilization in an ammonia-doped power plant according to claim 1, characterized in that the cooling unit comprises three rows of tube bundles arranged in parallel, wherein the tube bundles on both sides are steam exhaust tube bundles (2.1) and the tube bundle in the middle is a liquid ammonia tube bundle (2.2) to avoid frosting of the surface of the liquid ammonia tube bundle (2.2).

3. The direct air cooling system for utilizing ammonia cold energy in an ammonia-doped power plant of claim 1, wherein the flow directions of the steam exhaust tube bundle (2.1) and the liquid ammonia tube bundle (2.2) in the cooling unit are opposite.

4. The direct air cooling system for utilizing ammonia cold energy in the ammonia-doped power plant of claim 1, wherein the steam exhaust tube bundle (2.1) and the liquid ammonia tube bundle (2.2) in the cooling unit are arranged in a staggered manner.

5. The direct air cooling system for utilizing ammonia cold energy in the ammonia-doped power plant according to any one of claims 1 to 4, wherein the cooling unit comprises a concurrent cooling component and a countercurrent cooling component, wherein the steam exhaust tube bundle (2.1) of the concurrent cooling component is a concurrent tube bundle, the upper end of the concurrent tube bundle is connected with the steam exhaust distribution pipe (8), the lower end of the concurrent tube bundle is connected with the condensate pipe (6), the liquid ammonia tube bundle (2.2) of the concurrent cooling component is a countercurrent tube bundle, the upper end of the countercurrent tube bundle is connected with the ammonia gas pipe (9), and the lower end of the countercurrent tube bundle is connected with the liquid ammonia distribution pipe (4); the exhaust pipe bundle (2.1) of the countercurrent cooling assembly is a countercurrent pipe bundle, the upper end of the countercurrent pipe bundle is sealed, the lower end of the countercurrent pipe bundle is connected with the condensate pipe (6), meanwhile, the liquid ammonia pipe bundle (2.2) of the countercurrent cooling assembly is a concurrent pipe bundle, the upper end of the countercurrent pipe bundle is connected with the ammonia pipe (9), and the lower end of the countercurrent pipe bundle is sealed.

6. The direct air cooling system for utilizing ammonia cooling energy in an ammonia-doped power plant of claim 5, wherein the forward flow cooling modules and the counter flow cooling modules are arranged at intervals in the cooling unit, and the number of the forward flow cooling modules is larger than that of the counter flow cooling modules.

7. Use of a direct air cooling system using ammonia cooling energy according to any one of claims 1 to 6 in an ammonia-doped power plant.

8. The application of the direct air cooling system using ammonia cold energy in the ammonia-mixed power plant as recited in claim 7, wherein the liquid ammonia inlet (1.1) is connected with a liquid ammonia storage tank (11) through a liquid ammonia pump (12) for introducing liquid ammonia; the exhaust steam inlet (1.2) is connected with a steam turbine (16) and is used for introducing exhaust steam; the condensate tank (5) is connected to a boiler (15) by a feed pump (14) to feed condensate to the boiler (15).

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