Ammonia extraction device for photovoltaic waste gas and working method thereof

Abstract

The present application discloses an ammonia extraction device for photovoltaic waste gas and a working method thereof. The ammonia extraction device for photovoltaic waste gas comprises a heat exchanger and a cryogenic distillation device. The waste gas is introduced into the heat exchanger and heat-exchanged in the heat exchanger to be converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen. The cryogenic distillation device comprises a distillation tower, a reboiler and a condenser. The reboiler is configured to evaporate liquid ammonia mixed with liquid silane, hydrogen and nitrogen to convert it into an ammonia-mixed mixed gas and liquid ammonia. The ammonia-mixed mixed gas in the distillation tower and the mixed gas in the distillation tower are mixed to form a light component. The condenser is configured to condense the light component to obtain liquid ammonia and a mixed gas. The liquid ammonia is discharged from the condenser and enters the distillation tower. The waste gas and the product after the waste gas heat exchange are successively recovered and processed by using the boiling point difference to fully recover the ammonia in the waste gas and purify it, thereby obtaining a high-purity liquid nitrogen product.

Description

Technical Field

[0001] The present invention relates to the technical field of photovoltaic waste gas recovery, and in particular to an ammonia extraction device for photovoltaic waste gas and a working method thereof. Background Art

[0002] A large amount of waste gas such as silane, ammonia, hydrogen and nitrogen is generated in the photovoltaic solar energy production process. Since ammonia is harmful to the environment and human health, the waste gas is usually recycled to extract ammonia in the waste gas in order to protect the environment. At the same time, recycling ammonia can also reduce production costs.

[0003] At present, when treating waste gas, the waste gas is introduced into the combustion chamber, and the silane in the waste gas contacts the input compressed air and nitrogen to spontaneously combust or undergo an oxidation reaction. After the reaction, a large amount of silica dust is generated. The waste gas obtained by removing silane from the waste gas passes through the packing layer and then enters the spray chamber, so that the ammonia in the waste gas after combustion contacts with water to form ammonia water. The purified waste gas obtained by removing ammonia from the waste gas after combustion is discharged by the exhaust fan to the outside. In actual operation, it is found that there is still a small amount of silica dust in the purified waste gas, which means that the waste gas after combustion is mixed with silica dust. When the waste gas after combustion passes through the packing layer, the silica dust flowing with the waste gas after combustion will adhere to the packing layer. In the long run, the packing layer will be blocked, which will affect the exhaust fan. In order to ensure that the equipment can work normally, it is usually necessary to clean or replace the packing regularly, which is cumbersome to operate, and when cleaning or replacing the packing, the entire equipment is required to be shut down for processing, which affects the processing progress and the waste gas treatment efficiency is relatively low. Summary of the invention

[0004] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides an ammonia extraction device for photovoltaic waste gas, which is used to treat the waste gas generated in the photovoltaic solar energy production process to obtain liquid ammonia and a mixed gas containing silane, hydrogen and nitrogen. The ammonia extraction device for photovoltaic waste gas includes:

[0005] A heat exchanger, wherein the heat exchanger has a first feed port and a first discharge port, the exhaust gas is introduced into the heat exchanger through the first feed port and is heat-exchanged in the heat exchanger to be converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen, and the first discharge port is used to discharge the mixed gas and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen;

[0006] A cryogenic distillation device, comprising:

[0007] A distillation tower, wherein the distillation tower has an inlet, the first outlet is connected to the inlet through a pipeline, the mixed gas discharged from the first outlet and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen are introduced into the distillation tower from the inlet, the top of the distillation tower forms an exhaust port and a liquid return port, and the bottom of the distillation tower forms a product outlet;

[0008] a reboiler, the reboiler being installed in the distillation tower, the reboiler being configured to evaporate the liquid ammonia mixed with liquid silane, hydrogen and nitrogen passing through the inlet to convert it into an ammonia mixed mixed gas and liquid ammonia, and the ammonia mixed mixed gas in the distillation tower and the mixed gas in the distillation tower are mixed to form a light component which is discharged from the exhaust port;

[0009] A condenser, wherein the condenser has an air inlet, a liquid discharge port and an air outlet, the air inlet is connected with the air outlet through a pipeline, the light component discharged from the air outlet is introduced into the condenser from the air inlet, the condenser is configured to condense the light component to obtain liquid ammonia and a mixed gas, the liquid discharge port is used to discharge liquid ammonia, the air outlet is used to discharge the mixed gas, the liquid return port is connected with the liquid discharge port through a pipeline, the liquid ammonia discharged from the liquid discharge port enters the distillation tower from the liquid return port, and the product outlet is used to discharge the liquid ammonia in the distillation tower.

[0010] According to one embodiment of the present invention, the reboiler has a second feed port and a second discharge port, the second feed port is used to introduce exhaust gas into the reboiler, the reboiler is configured to exchange heat between the exhaust gas introduced by the second feed port and liquid ammonia mixed with liquid silane, hydrogen and nitrogen passing through the feed port, and the second discharge port is used to discharge the cold exhaust gas obtained by heat exchange and cooling of the exhaust gas.

[0011] According to one embodiment of the present invention, the second discharge port is connected to the heat exchanger through a pipeline, and the cold exhaust gas discharged from the second discharge port is introduced into the heat exchanger to be heat exchanged and cooled again in the heat exchanger. The mixed gas obtained by heat exchange and cooling of the cold exhaust gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen are discharged from the first discharge port.

[0012] According to one embodiment of the present invention, the heat exchanger has a first inlet and a first outlet, the first inlet is used to introduce a refrigerant with a predetermined cooling capacity into the heat exchanger, the heat exchanger is configured to exchange heat between the exhaust gas introduced by the first feed port and the cold exhaust gas discharged by the second discharge port and the refrigerant with a predetermined cooling capacity introduced by the first inlet, and the first outlet is used to discharge the refrigerant that absorbs heat through heat exchange.

[0013] According to one embodiment of the present invention, the heat exchanger also has a second inlet and a second outlet, the second inlet is connected to the outlet through a pipeline, and the mixed gas discharged from the outlet enters the heat exchanger from the second inlet. The heat exchanger is configured to exchange heat between the exhaust gas introduced from the first feed port and the cold exhaust gas discharged from the second outlet and the mixed gas introduced from the second inlet, and the second outlet is used to discharge the mixed gas cooled by heat exchange to the outside.

[0014] According to one embodiment of the present invention, the condenser has a third inlet and a third outlet, the third inlet is used to introduce a refrigerant with a predetermined cooling capacity into the condenser, the condenser is configured to exchange heat between the light component introduced by the air inlet and the refrigerant with a predetermined cooling capacity introduced by the third inlet, and the third outlet is used to discharge the refrigerant that absorbs heat through heat exchange.

[0015] According to one embodiment of the present invention, the ammonia extraction equipment for photovoltaic exhaust gas also includes a refrigerator, the refrigerator has a fourth inlet and a fourth outlet, the first outlet and the third outlet are both connected to the fourth inlet through a pipeline, the refrigerant discharged from the first outlet and the third outlet that absorbs heat through heat exchange enters the refrigerator from the fourth inlet, the refrigerator is configured to convert the refrigerant that absorbs heat through heat exchange into a refrigerant with a predetermined cooling capacity, the fourth outlet is used to discharge the refrigerant with a predetermined cooling capacity, the fourth outlet is connected to the first inlet and the third inlet through a pipeline, the refrigerant with a predetermined cooling capacity discharged from the fourth outlet is partially introduced into the heat exchanger from the first inlet, and partially introduced into the condenser from the third inlet.

[0016] According to one embodiment of the present invention, the ammonia extraction equipment for photovoltaic exhaust gas also includes a booster fan. The pipeline connected to the second feed port and the pipeline connected to the first feed port are combined into a main pipeline and the booster fan is installed on the corresponding main pipeline. The booster fan is used to pressurize the exhaust gas and guide the exhaust gas into the heat exchanger and the reboiler.

[0017] According to one embodiment of the present invention, the ammonia extraction equipment for photovoltaic waste gas also includes a product storage tank, which has a product inlet. The product inlet is connected to the product outlet through a pipeline, and the liquid nitrogen discharged from the product outlet is introduced from the product inlet into the product storage tank, and the product storage tank is used to store liquid nitrogen.

[0018] In order to solve the above technical problems and achieve at least one advantage of the present invention, the present invention provides a working method of an ammonia extraction device for photovoltaic exhaust gas, and the working method of the ammonia extraction device for photovoltaic exhaust gas comprises the following steps:

[0019] The waste gas enters the heat exchanger from the first feed port and is converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen through heat exchange in the heat exchanger. The mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen are discharged from the first discharge port and enter the distillation tower through the inlet port.

[0020] The reboiler installed in the distillation tower evaporates the liquid ammonia mixed with liquid silane, hydrogen and nitrogen, so that the liquid ammonia mixed with liquid silane, hydrogen and nitrogen is converted into ammonia mixed mixed gas and liquid ammonia by heat, and the light component formed by the ammonia mixed mixed gas and the mixed gas in the distillation tower is discharged from the exhaust port and introduced into the condenser through the air inlet;

[0021] Ammonia gas in the light component is condensed into liquid nitrogen in the condenser, and the liquid ammonia is discharged from the liquid discharge port and enters the distillation tower through the liquid return port. At the same time, the mixed gas obtained by condensing the light component is discharged through the gas outlet.

[0022] Compared with the prior art, the ammonia extraction device for photovoltaic waste gas of the present invention has the following technical effects:

[0023] 1. The waste gas and the product after waste gas heat exchange are recovered and treated in turn by using the boiling point difference, so as to fully recover the ammonia in the waste gas and purify it, thereby obtaining a high-purity liquid nitrogen product. Compared with the existing treatment method, the treated product will not affect the treatment progress, the operation is convenient and the treatment is efficient.

[0024] 2. When evaporating liquid ammonia mixed with liquid silane, hydrogen and nitrogen, the waste gas is used as a heat source to fully utilize the heat of the waste gas without introducing other energy sources, which is energy-saving and environmentally friendly.

[0025] 3. Before being introduced into the heat exchanger, part of the exhaust gas is cooled by heat exchange in the reboiler and then cooled by heat exchange again in the heat exchanger. By cooling the temperature twice, the cooling capacity required for heat exchange in the heat exchanger is reduced, thereby saving energy consumption.

[0026] 4. In the initial operation of the ammonia extraction equipment for photovoltaic exhaust gas, the refrigerant can be used as a cold source for heat exchange between the exhaust gas and the cold exhaust gas. In the later operation, the mixed gas produced after the condensation of the refrigerant and the light components can be used as a cold source for heat exchange between the exhaust gas and the cold exhaust gas, so as to make full use of the cold capacity of the product after the exhaust gas treatment, thereby saving energy and reducing the treatment cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The schematic diagram of the structure of the ammonia extraction device for photovoltaic exhaust gas according to the present invention is shown.

[0028] Figure 2 A partial structural schematic diagram of the ammonia extraction device for photovoltaic exhaust gas described in the present invention is shown.

[0029] Figure 3 Another partial structural schematic diagram of the ammonia extraction device for photovoltaic exhaust gas described in the present invention is shown.

[0030] Reference numerals:

[0031] Heat exchanger 10; first feed port 101; first discharge port 102; feed branch port 103; first inlet 104; first outlet 105; second inlet 106; second outlet 107;

[0032] Cryogenic rectification device 20; rectification tower 21; inlet 2101; exhaust port 2102; 2103, liquid return port; product outlet 2104; reboiler 22; second feed inlet 2201; second discharge port 2202; condenser 23; air inlet 2301; liquid discharge port 2302; air outlet 2303; third inlet 2304; third outlet 2305;

[0033] Freezer 30; fourth inlet 301; fourth outlet 302;

[0034] Booster fan 40;

[0035] Product storage tank 50; product inlet 501. DETAILED DESCRIPTION

[0036] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0037] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0038] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0039] refer to Figure 1 to Figure 2According to a preferred embodiment of the present invention, an ammonia extraction device for photovoltaic waste gas will be described in detail below. The ammonia extraction device for photovoltaic waste gas is used to process the waste gas generated in the photovoltaic solar energy production process to obtain liquid ammonia and a mixed gas containing silane, hydrogen and nitrogen.

[0040] Under normal pressure, the boiling point of ammonia is -33.5°C, the boiling point of silane is -112°C, the boiling point of hydrogen is -252.87°C, and the boiling point of nitrogen is -195.8°C. It can be seen that the boiling point of ammonia is much higher than those of silane, hydrogen, and nitrogen. When ammonia, silane, hydrogen, and nitrogen are all in gaseous state, ammonia is more easily liquefied by cold than silane, hydrogen, and nitrogen. When ammonia, silane, hydrogen, and nitrogen are all in liquid state, silane, hydrogen, and nitrogen are more easily vaporized by heat than ammonia.

[0041] The ammonia extraction device for photovoltaic waste gas includes a heat exchanger 10, and the heat exchanger 10 has a first feed port 101 and a first discharge port 102. The waste gas is introduced into the heat exchanger 10 through the first feed port 101 and is converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen through heat exchange in the heat exchanger 10. The first discharge port 102 is used to discharge the mixed gas and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen.

[0042] Preferably, the temperature of the waste gas is 30°C to 45°C, and the temperature of the mixed gas discharged from the first discharge port 102 and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen are both -42°C to -48°C.

[0043] Since the purity of the liquid ammonia in the liquid ammonia mixed with liquid silane, hydrogen and nitrogen obtained by treating the waste gas through the heat exchanger 10 is relatively low, it needs to be purified. The ammonia extraction equipment for photovoltaic waste gas includes a cryogenic distillation device 20, and the cryogenic distillation device 20 includes a distillation tower 21 and a reboiler 22. The distillation tower 21 has an inlet 2101, and the first discharge port 102 is connected to the inlet 2101 through a pipeline. The mixed gas discharged from the first discharge port 102 and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen are introduced into the distillation tower 21 from the inlet 2101. The reboiler 22 is installed on the distillation tower 21, and is configured to evaporate the liquid ammonia mixed with liquid silane, hydrogen and nitrogen passing through the inlet 2101, so that the liquid ammonia mixed with liquid silane, hydrogen and nitrogen is heated and converted into an ammonia-mixed mixed gas and liquid ammonia. At this time, the liquid ammonia is purified, thereby obtaining high-purity liquid ammonia.

[0044] The top of the distillation tower 21 forms an exhaust port 2102, and the light components formed by the mixture of the ammonia-doped mixed gas in the distillation tower 21 and the mixed gas in the distillation tower 21 are discharged from the exhaust port 2102. The cryogenic distillation device 20 also includes a condenser 23, and the condenser 23 has an air inlet 2301, a liquid discharge port 2302 and a gas outlet 2303. The air inlet 2301 is connected to the exhaust port 2102 through a pipeline, and the light components discharged from the exhaust port 2102 are introduced into the condenser 23 from the air inlet 2301. The condenser 23 is configured to condense the light components to obtain liquid ammonia and mixed gas, the liquid discharge port 2302 is used to discharge liquid ammonia, and the gas outlet 2303 is used to discharge mixed gas. A liquid return port 2103 is formed at the top of the distillation tower 21, and the liquid return port 2103 is connected to the liquid discharge port 2302 through a pipeline. The liquid ammonia discharged from the liquid discharge port 2302 enters the distillation tower 21 from the liquid return port 2103, thereby fully recovering ammonia and improving the recovery rate of ammonia.

[0045] Preferably, the temperature of the light component introduced through the gas inlet 2301, the mixed gas discharged through the gas outlet 2303, and the liquid nitrogen introduced through the liquid return port 2103 are all -42°C to -48°C.

[0046] In this way, through the cooperation of the heat exchanger 10 and the cryogenic distillation device 20, the exhaust gas and the product after the exhaust gas heat exchange are successively recovered and processed by utilizing the boiling point difference, so as to fully recover the ammonia in the exhaust gas and purify it, thereby obtaining a high-purity liquid nitrogen product. Compared with the existing processing method, the processed product will not affect the processing progress, the operation is convenient and the processing is efficient.

[0047] A product outlet 2104 is formed at the bottom of the distillation tower 21 , and the product outlet 2104 is used to discharge the liquid ammonia in the distillation tower 21 .

[0048] Preferably, the reboiler 22 is disposed in the distillation tower 21 , and the reboiler 22 is configured to heat the mixed gas and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen which are disposed in the distillation tower 21 and located at the periphery of the reboiler 22 .

[0049] As a variation, the reboiler 22 is disposed outside the distillation tower 21 and is connected to the distillation tower 21 through two pipelines. Liquid ammonia mixed with liquid silane, hydrogen and nitrogen in the distillation tower 21 can be introduced into the reboiler 22 and refluxed after being heated.

[0050] The reboiler 22 has a second feed port 2201 and a second discharge port 2202. The second feed port 2201 is used to introduce waste gas into the reboiler 22. The reboiler 22 is configured to exchange heat between the waste gas introduced by the second feed port 2201 and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen through the introduction port 2101, so as to use the waste gas as a heat source for purifying liquid ammonia. In this way, there is no need to introduce other energy sources, and the use is more energy-saving. The second discharge port 2202 is used to discharge the cold waste gas obtained by heat exchange and cooling of the waste gas.

[0051] Preferably, the temperature of the cold exhaust gas discharged from the second discharge port 2202 is -15°C to -20°C.

[0052] It is worth mentioning that the second discharge port 2202 is connected to the heat exchanger 10 through a pipeline, and the cold exhaust gas discharged from the second discharge port 2202 is introduced into the heat exchanger 10 to exchange heat again in the heat exchanger 10 to reduce the temperature, and the mixed gas obtained by heat exchange and cooling of the cold exhaust gas and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen are discharged from the first discharge port 102. In this way, since part of the exhaust gas introduced into the heat exchanger 10 is cooled in the reboiler 22 before being cooled, the cooling capacity required for heat exchange in the heat exchanger 10 is reduced, thereby saving energy consumption.

[0053] Preferably, the heat exchanger 10 further has a feed branch port 103 , and the second discharge port 2202 is connected to the feed branch port 103 through a pipeline, and the cold exhaust gas discharged from the second discharge port 2202 is introduced into the heat exchanger 10 from the feed branch port 103 .

[0054] As a variant, the second outlet 2202 is connected to the pipeline connected to the first feed port 101 through a pipeline, and the cold exhaust gas discharged from the second outlet 2202 is introduced into the heat exchanger 10 from the first feed port 101.

[0055] Preferably, the pipeline connected to the second feed port 2201 and the pipeline connected to the first feed port 101 are combined into a main pipeline, so that the exhaust gas can be introduced through the main pipeline.

[0056] refer to Figure 1 and Figure 3 The heat exchanger 10 has a first inlet 104 and a first outlet 105. The first inlet 104 is used to introduce a refrigerant with a predetermined cooling capacity, such as Freon, into the heat exchanger 10 to serve as a cold source for heat exchange between the exhaust gas and the cold exhaust gas. The heat exchanger 10 is configured to exchange heat between the exhaust gas introduced by the first feed port 101 and the cold exhaust gas discharged by the second discharge port 2202 and the refrigerant with a predetermined cooling capacity introduced by the first inlet 104. The first outlet 105 is used to discharge the refrigerant that absorbs heat through heat exchange.

[0057] The heat exchanger 10 also has a second inlet 106 and a second outlet 107. The second inlet 106 is connected to the outlet 2303 through a pipeline. The mixed gas discharged from the outlet 2303 enters the heat exchanger 10 from the second inlet 106 to serve as a cold source for heat exchange and cooling of the waste gas and the cold waste gas. The heat exchanger 10 is configured to exchange heat between the waste gas introduced from the first feed port 101 and the cold waste gas discharged from the second outlet 2202 and the mixed gas introduced from the second inlet 106. The second outlet 107 is used to discharge the mixed gas cooled by heat exchange to the outside.

[0058] Preferably, the temperature of the mixed gas discharged from the second outlet 107 is 30°C-40°C.

[0059] In this way, in the initial operation of the ammonia extraction equipment for photovoltaic exhaust gas, the refrigerant can be used as a cold source for heat exchange between the exhaust gas and the cold exhaust gas. In the later stage of operation, the mixed gas produced after the condensation of the refrigerant and the light components can be used as a cold source for heat exchange between the exhaust gas and the cold exhaust gas, so as to make full use of the cold capacity of the product after the exhaust gas treatment, thereby saving energy and reducing the treatment cost.

[0060] The condenser 23 has a third inlet 2304 and a third outlet 2305. The third inlet 2304 is used to introduce a refrigerant with a predetermined cooling capacity, such as Freon, into the condenser 23 to serve as a cold source for condensing the light component. The condenser 23 is configured to exchange heat between the light component introduced through the air inlet 2301 and the refrigerant with a predetermined cooling capacity introduced through the third inlet 2304. The third outlet 2305 is used to discharge the refrigerant that absorbs heat through heat exchange.

[0061] The ammonia extraction device for photovoltaic waste gas also includes a refrigerator 30, which has a fourth inlet 301 and a fourth outlet 302. The first outlet 105 and the third outlet 2305 are both connected to the fourth inlet 301 through a pipeline. The refrigerant discharged by the first outlet 105 and the third outlet 2305 and absorbing heat by heat exchange enters the refrigerator 30 from the fourth inlet 301. The refrigerator 30 is configured to convert the refrigerant absorbing heat by heat exchange into a refrigerant with a predetermined cooling capacity. The fourth outlet 302 is used to discharge the refrigerant with a predetermined cooling capacity. The fourth outlet 302 is connected to the first inlet 104 and the third inlet 2304 through a pipeline. The refrigerant with a predetermined cooling capacity discharged by the fourth outlet 302 is partially introduced into the heat exchanger 10 from the first inlet 104, and partially introduced into the condenser 23 from the third inlet 2304. In this way, the refrigerator 30 can continuously provide a cold source to the heat exchanger 10 and the condenser 23, so that the exhaust gas treatment operation can be carried out in an orderly manner.

[0062] Preferably, the pipeline connected to the first outlet 105 and the pipeline connected to the third outlet 2305 are combined into a main pipeline and connected to the fourth inlet 301 through the main pipeline, so that the refrigerant that absorbs heat by heat exchange is uniformly introduced into the refrigerator 30 through the main pipeline.

[0063] Preferably, the pipeline connected to the first inlet 104 and the pipeline connected to the third inlet 2304 are combined into a main pipeline and communicated with the fourth outlet 302 through the main pipeline, so as to discharge the refrigerant with a predetermined cooling capacity uniformly through the main pipeline.

[0064] refer to Figure 1 to Figure 2 The ammonia extraction equipment for photovoltaic exhaust gas also includes a booster fan 40. The booster fan 40 is installed on the main pipeline connecting the pipeline connecting the second feed port 2201 and the pipeline connecting the first feed port 101. The booster fan 40 is used to pressurize the exhaust gas and guide the exhaust gas into the heat exchanger 10 and the reboiler 22 to ensure that the exhaust gas can flow smoothly.

[0065] The ammonia extraction equipment for photovoltaic exhaust gas also includes a product storage tank 50, which has a product inlet 501. The product inlet 501 is connected to the product outlet 2104 through a pipeline. The liquid nitrogen discharged from the product outlet 2104 is introduced into the product storage tank 50 from the product inlet 501. The product storage tank 50 is used to store liquid nitrogen.

[0066] A working method of an ammonia extraction device for photovoltaic waste gas is now proposed, comprising the following steps:

[0067] The waste gas enters the heat exchanger 10 from the first feed port 101 and is converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen through heat exchange in the heat exchanger 10. The mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen are discharged from the first discharge port 102 and enter the distillation tower 21 through the inlet 2101.

[0068] The reboiler 22 installed in the distillation tower 21 evaporates the liquid ammonia mixed with liquid silane, hydrogen and nitrogen, so that the liquid ammonia mixed with liquid silane, hydrogen and nitrogen is converted into ammonia mixed mixed gas and liquid ammonia by heat, and the light components formed by the ammonia mixed mixed gas and the mixed gas in the distillation tower 21 are discharged from the exhaust port 2102 and introduced into the condenser 23 through the air inlet 2301;

[0069] The ammonia in the light component is condensed into liquid nitrogen in the condenser 23 , and the liquid ammonia is discharged from the liquid discharge port 2302 and enters the distillation tower 21 through the liquid return port 2103 , while the mixed gas obtained by condensing the light component is discharged through the gas outlet 2303 .

[0070] Preferably, the working method of the ammonia extraction equipment for photovoltaic waste gas includes the following steps: introducing waste gas into the reboiler 22 through the second feed port 2201, performing heat exchange between the waste gas and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen through the inlet port 2101, so as to provide a heat source for purifying the liquid ammonia, and the cold waste gas obtained by heat exchange and cooling the waste gas is discharged through the second discharge port 2202 and introduced into the heat exchanger 10, so as to make full use of the heat of the waste gas and save the cold source.

[0071] Preferably, the working method of the ammonia extraction device for photovoltaic exhaust gas comprises the following steps:

[0072] The refrigerant with a predetermined cooling capacity in the refrigerator 30 is discharged through the fourth outlet 302;

[0073] Part of the refrigerant with a predetermined cooling capacity enters the heat exchanger 10 through the first inlet 104, thereby providing a cold source for the heat exchange between the exhaust gas and the cold exhaust gas. The refrigerant that absorbs heat through the heat exchange is discharged from the first outlet 105 and enters the refrigerator 30 through the fourth inlet 301.

[0074] Part of the refrigerant with a predetermined cooling capacity enters the condenser 23 through the third inlet 2304, so that the light component condenses to provide a cold source, and the refrigerant that absorbs heat through heat exchange is discharged from the third outlet 2305 and enters the refrigerator 30 through the fourth inlet 301.

[0075] Preferably, the working method of the ammonia extraction equipment for photovoltaic exhaust gas includes the following steps: the mixed gas discharged through the outlet 2303 is introduced into the heat exchanger 10 through the second inlet 106 to provide a cold source for heat exchange between the exhaust gas and the cold exhaust gas, and the mixed gas heated by heat exchange is discharged to the outside through the second outlet 107.

[0076] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The advantages of the present invention have been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. Ammonia extraction equipment for photovoltaic waste gas, used to treat waste gas generated in the photovoltaic solar energy production process to obtain liquid ammonia and a mixed gas containing silane, hydrogen and nitrogen, characterized in that: The ammonia extraction equipment for photovoltaic waste gas comprises: A heat exchanger, wherein the heat exchanger has a first feed port and a first discharge port, and the heat exchanger has a first inlet and a first outlet, wherein the first inlet is used to introduce a refrigerant having a predetermined cooling capacity into the heat exchanger, and the exhaust gas is introduced into the heat exchanger through the first feed port and is heat-exchanged with the refrigerant having a predetermined cooling capacity in the heat exchanger to be converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen, wherein the first discharge port is used to discharge the mixed gas and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen, and wherein the first outlet is used to discharge the refrigerant that absorbs heat through heat exchange; A cryogenic distillation device, comprising: A distillation tower, wherein the distillation tower has an inlet, the first outlet is connected to the inlet through a pipeline, the mixed gas discharged from the first outlet and the liquid ammonia mixed with liquid silane, hydrogen and nitrogen are introduced into the distillation tower from the inlet, the top of the distillation tower forms an exhaust port and a liquid return port, and the bottom of the distillation tower forms a product outlet; a reboiler, the reboiler being arranged in the distillation tower, the reboiler being arranged to evaporate the liquid ammonia mixed with liquid silane, hydrogen and nitrogen passing through the inlet to convert it into an ammonia mixed mixed gas and liquid ammonia, and the light component formed by the ammonia mixed mixed gas in the distillation tower and the mixed gas in the distillation tower being mixed with each other is discharged from the exhaust port; A condenser, wherein the condenser has an air inlet, a liquid discharge port and an air outlet, the air inlet is connected to the air outlet through a pipeline, the light component discharged from the air outlet is introduced into the condenser from the air inlet, the condenser has a third inlet and a third outlet, the third inlet is used to introduce a refrigerant with a predetermined cooling capacity into the condenser, the condenser is configured to exchange heat between the light component introduced from the air inlet and the refrigerant with a predetermined cooling capacity introduced from the third inlet, the third outlet is used to discharge the refrigerant that absorbs heat during the heat exchange, the liquid discharge port is used to discharge liquid ammonia obtained by condensing the light component, the air outlet is used to discharge a mixed gas obtained by condensing the light component, the liquid return port is connected to the liquid discharge port through a pipeline, the liquid ammonia discharged from the liquid discharge port enters the distillation tower from the liquid return port, and the product outlet is used to discharge the liquid ammonia in the distillation tower.

2. The ammonia extraction device for photovoltaic waste gas according to claim 1, characterized in that: The reboiler has a second feed port and a second discharge port, the second feed port is used to introduce exhaust gas into the reboiler, the reboiler is configured to exchange heat between the exhaust gas introduced by the second feed port and liquid ammonia mixed with liquid silane, hydrogen and nitrogen passing through the feed port, and the second discharge port is used to discharge the cold exhaust gas obtained by heat exchange and cooling of the exhaust gas.

3. The ammonia extraction device for photovoltaic waste gas according to claim 2, characterized in that: The second discharge port is connected to the heat exchanger through a pipeline, and the cold exhaust gas discharged from the second discharge port is introduced into the heat exchanger to be heat exchanged and cooled again in the heat exchanger. The mixed gas obtained by heat exchange and cooling of the cold exhaust gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen are discharged from the first discharge port.

4. The ammonia extraction device for photovoltaic waste gas according to claim 3, characterized in that: The heat exchanger also has a second inlet and a second outlet, the second inlet is connected to the outlet through a pipeline, and the mixed gas discharged from the outlet enters the heat exchanger from the second inlet. The heat exchanger is configured to exchange heat between the exhaust gas introduced from the first feed port and the cold exhaust gas discharged from the second outlet and the mixed gas introduced from the second inlet, and the second outlet is used to discharge the mixed gas cooled by heat exchange to the outside.

5. The ammonia extraction device for photovoltaic waste gas according to claim 4, characterized in that: The ammonia extraction equipment for photovoltaic exhaust gas also includes a refrigerator, which has a fourth inlet and a fourth outlet. The first outlet and the third outlet are both connected to the fourth inlet through a pipeline. The refrigerant discharged from the first outlet and the third outlet that absorbs heat through heat exchange enters the refrigerator from the fourth inlet. The refrigerator is configured to convert the refrigerant that absorbs heat through heat exchange into a refrigerant with a predetermined cooling capacity. The fourth outlet is used to discharge the refrigerant with a predetermined cooling capacity. The fourth outlet is connected to the first inlet and the third inlet through a pipeline. The refrigerant with a predetermined cooling capacity discharged from the fourth outlet is partially introduced into the heat exchanger from the first inlet, and partially introduced into the condenser from the third inlet.

6. The ammonia extraction device for photovoltaic waste gas according to claim 2, characterized in that: The ammonia extraction equipment for photovoltaic exhaust gas also includes a booster fan. The pipeline connecting the second feed port and the pipeline connecting the first feed port are combined into a main pipeline and the booster fan is installed on the corresponding main pipeline. The booster fan is used to pressurize the exhaust gas and guide the exhaust gas into the heat exchanger and the reboiler.

7. The ammonia extraction device for photovoltaic waste gas according to claim 1, characterized in that: The ammonia extraction equipment for photovoltaic exhaust gas also includes a product storage tank, which has a product inlet. The product inlet is connected to the product outlet through a pipeline. The liquid ammonia discharged from the product outlet is introduced into the product storage tank from the product inlet. The product storage tank is used to store liquid ammonia.

8. The working method of the ammonia extraction device for photovoltaic exhaust gas according to any one of claims 1 to 7, characterized in that: The working method of the ammonia extraction device for photovoltaic exhaust gas comprises the following steps: The waste gas enters the heat exchanger from the first feed port and is converted into a mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen by heat exchange with the refrigerant having a predetermined cooling capacity introduced from the first inlet in the heat exchanger. The mixed gas and liquid ammonia mixed with liquid silane, hydrogen and nitrogen are discharged from the first discharge port and enter the distillation tower through the inlet port. The reboiler installed in the distillation tower evaporates the liquid ammonia mixed with liquid silane, hydrogen and nitrogen, so that the liquid ammonia mixed with liquid silane, hydrogen and nitrogen is converted into ammonia mixed mixed gas and liquid ammonia by heat, and the light component formed by the ammonia mixed mixed gas and the mixed gas in the distillation tower is discharged from the exhaust port and introduced into the condenser through the air inlet; The ammonia gas in the light component exchanges heat with the refrigerant with a predetermined cooling capacity introduced from the third inlet in the condenser and is condensed into liquid ammonia. The liquid ammonia is discharged from the liquid discharge port and enters the distillation tower through the liquid return port. At the same time, the mixed gas obtained by the condensation of the light component is discharged through the gas outlet.

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