Exhaust gas recovery system

Abstract

The invention relates to an exhaust gas recovery system. The exhaust gas recovery system comprises a first input pipeline, a second input pipeline, a third input pipeline, an alkaline washing tower, a water washing tower, a gas holder and a compressor, the first input pipeline is used for inputting coal hydrogen gasification gas, and a gas outlet is communicated with a gas inlet of the alkaline washing tower; the second input pipeline is used for inputting ammonia-containing acid gas, and a gas outlet is communicated with a gas inlet of the alkaline washing tower; the third input pipeline is used for inputting flash steam and a gas outlet is communicated with a gas inlet of the alkaline washing tower; a gas outlet of the alkaline washing tower is communicated with a gas inlet of the water washing tower, a gas outlet of the water washing tower is communicated with a gas inlet of the gas holder, and a gas outlet of the gas holder is communicated with a gas inlet of the compressor. According to the technical scheme, by arranging the alkaline washing tower and the water washing tower, exhausted gas can be effectively purified and then stored in the gas holder, recycling of the exhausted gas is achieved, and the utilization rate of resources is increased.

Description

Technical Field

[0001] The present disclosure relates to the field of gas recovery technology, and in particular, to an exhaust gas recovery system. Background Art

[0002] Low calorific value emission gas is waste gas generated in the process of coal mining, coal chemical industry, high / coke / converter, coal deep processing and other fields.

[0003] The main combustible components are: hydrogen, hydrogen sulfide, methane, ethane, propane, ethylene, propylene, butene, etc. These gases are of various types and complex in composition. The concentration of combustible components is low, the calorific value is low, combustion is difficult, and they are flammable and explosive. They pose a great threat to production safety and health. If such waste gas is comprehensively recycled and utilized through combustion technology, it will be a green and clean energy, which can save primary energy such as coal, oil, and natural gas, and achieve the effect of energy conservation and emission reduction.

[0004] my country is rich in low-calorific-value gas resources, with various industries accumulating over 10 billion Nm3 annually. However, these gases have long been considered "waste gases," with most being discharged in vain. This not only pollutes the environment, wastes energy, and brings about a series of social problems: low-calorific-value gases are flammable and explosive, leading to numerous accidents that cause huge casualties and property losses; methane in low-calorific-value gases is a potent greenhouse gas with a greenhouse effect 120 times that of carbon dioxide. Large-scale releases of these gases into the atmosphere will lead to global warming and affect the global environment.

[0005] In the production process of coal chemical industry, petrochemical industry and other chemical fields, since the raw materials, catalysts and other input materials contain sulfur, ammonia and other substances, the exhaust gas in the production process will contain acid and ammonia, which is directly burned in the flare, which does not meet the environmental protection requirements.

[0006] Most domestic energy, chemical, and petrochemical companies generate low-calorific-value gaseous fuels during their production processes. Utilizing these low-calorific-value gaseous fuels is a key technological approach to improving my country's energy efficiency, contributing to pollution control, environmental purification, and carbon reduction. Chemical companies advocate energy conservation and emission reduction, developing a circular economy to conserve existing energy consumption and promote energy-saving and environmentally friendly production processes. However, for safety reasons, most domestic companies send these low-calorific-value combustible waste gases to flares for combustion, resulting in energy waste. Summary of the Invention

[0007] The purpose of the present disclosure is to provide an exhaust gas recovery system to solve the technical problems existing in the related art.

[0008] In order to achieve the above object, the present disclosure provides an exhaust gas recovery system, which includes a first input pipeline, a second input pipeline, a third input pipeline, an alkali washing tower, a water washing tower, a gas cabinet and a compressor; The first input pipeline is used to input coal-to-hydrogen gas, and its gas outlet is connected to the gas inlet of the alkali scrubber; the second input pipeline is used to input ammonia-containing gas, and its gas outlet is connected to the gas inlet of the alkali scrubber; the third input pipeline is used to input flash steam, and its gas outlet is connected to the gas inlet of the alkali scrubber; The air outlet of the alkali washing tower is connected to the air inlet of the water washing tower, the air outlet of the water washing tower is connected to the air inlet of the gas cabinet, and the air outlet of the gas cabinet is connected to the air inlet of the compressor.

[0009] Optionally, the exhaust gas recovery system further includes a first connecting pipeline, a second connecting pipeline and a third connecting pipeline; One end of the first connecting pipe is connected to the air outlet of the alkali washing tower, and the other end is connected to the air inlet of the water washing tower; One end of the second connecting pipe is connected to the air outlet of the water scrubber, and the other end is connected to the air inlet of the gas cabinet; One end of the third connecting pipe is connected to the air outlet of the gas cabinet, and the other end is connected to the air inlet of the compressor.

[0010] Optionally, the exhaust gas recovery system further includes a fourth input pipeline, which is used to input liquid nitrogen to wash the tail gas and has a gas outlet connected to the first connecting pipeline.

[0011] Optionally, the exhaust gas recovery system further includes a fourth connecting pipeline and a steam generator; One end of the fourth communicating pipe is communicated with the first air outlet of the compressor, and the other end is communicated with the air inlet of the steam generator.

[0012] Optionally, the exhaust gas recovery system further includes a fifth connecting pipeline and a boiler; One end of the fifth communicating pipe is communicated with the second air outlet of the compressor, and the other end is communicated with the air inlet of the boiler.

[0013] Optionally, the exhaust gas recovery system further includes a sixth communicating pipe and a waste heat recovery device, one end of the sixth communicating pipe is connected to the gas outlet of the boiler, and the other end is connected to the gas inlet of the waste heat recovery device.

[0014] Optionally, the exhaust gas recovery system further includes a seventh connecting pipe and a gasification device, one end of the seventh connecting pipe is connected to the gas outlet of the steam generator, and the other end is connected to the gas inlet of the gasification device.

[0015] Optionally, the exhaust gas recovery system further includes a first waste liquid pipeline and a second waste liquid pipeline, wherein the inlet of the first waste liquid pipeline is connected to the drain port of the alkali washing tower; the inlet of the second waste liquid pipeline is connected to the drain port of the water washing tower.

[0016] Optionally, the exhaust gas recovery system further includes a fourth connecting pipeline and a steam generator; One end of the fourth communicating pipe is communicated with the first air outlet of the compressor, and the other end is communicated with the air inlet of the steam generator; The exhaust gas recovery system further includes a fifth connecting pipeline and a boiler; One end of the fifth communicating pipe is connected to the second air outlet of the compressor, and the other end is connected to the air inlet of the boiler; Wherein, the outlet of the first waste liquid pipeline is used to communicate with the liquid inlet of the steam generator and / or boiler; and / or, the outlet of the second waste liquid pipeline is used to communicate with the liquid inlet of the steam generator and / or boiler.

[0017] Optionally, a first side wall inlet and a second side wall inlet are formed on the side wall of the first input pipeline, an air outlet of the second input pipeline is communicated with the first side wall inlet, and an air outlet of the third input pipeline is communicated with the second side wall inlet.

[0018] In the above-mentioned technical solution, first, the system is designed with three input pipelines (first, second, and third input pipelines), capable of simultaneously processing three different waste gas sources: coal-to-hydrogen gasification gas, ammonia-containing gas, and flash steam. This multi-source waste gas treatment design improves the system's flexibility and adaptability. Secondly, the installation of an alkali scrubber effectively removes acidic substances from coal-to-hydrogen gasification gas, ammonia-containing gas, and flash steam. In addition, a water scrubber removes NH3, oil, and dust. The treated exhaust gas is buffered in a gas tank and then pressurized by a compressor for delivery to subsequent devices or systems. The installation of an alkali scrubber and a water scrubber effectively purifies the exhaust gas and then stores it in the gas tank, enabling exhaust gas recycling and increasing resource utilization.

[0019] Other features and advantages of the present disclosure will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The accompanying drawings are used to provide a further understanding of the present disclosure and constitute a part of the specification. Together with the following detailed description, they are used to explain the present disclosure but do not constitute a limitation of the present disclosure. In the accompanying drawings: Figure 1 is a schematic diagram of an exhaust gas recovery system according to an embodiment of the present disclosure.

[0021] Description of Reference Numerals 11. First input pipeline; 12. Second input pipeline; 13. Third input pipeline; 14. Fourth input pipeline; 21. First connecting line; 22. Second connecting line; 23. Third connecting line; 24. Fourth connecting line; 25. Fifth connecting line; 26. Sixth connecting line; 27. Seventh connecting line; 28. First waste liquid line; 29. Second waste liquid line; 2. Alkali washing tower; 3. Water washing tower; 4. Gas cabinet; 5. Compressor; 6. Steam generator; 7. Boiler; 8. Waste heat recovery device; 9. Gasification device; 101. Coal-to-hydrogen gasification; 102. Ammonia-containing gas; 103. Flash steam; 104. Liquid nitrogen tail gas washing. DETAILED DESCRIPTION

[0022] Exemplary embodiments will be described in detail herein, with examples illustrated in the accompanying drawings. In the following description, when referring to the drawings, identical numerals in different figures represent identical or similar elements, unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present disclosure. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present disclosure, as detailed in the appended claims.

[0023] In the present disclosure, unless otherwise stated, terms such as "first" and "second" are used only to distinguish one element from another and do not have sequential or important meanings. In addition, the term "plurality" in this application refers to more than two and includes two.

[0024] It should also be noted that, in the description of this disclosure, unless otherwise expressly specified or limited, the terms "disposed," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of these terms in this disclosure based on specific circumstances.

[0025] Reference Figure 1As shown, the present disclosure provides an exhaust gas recovery system, which includes a first input pipeline 11, a second input pipeline 12, a third input pipeline 13, an alkali scrubber 2, a water scrubber 3, a gas cabinet 4, and a compressor 5. The first input pipeline 11 is used to input coal-to-hydrogen gasification gas 101, and its gas outlet is connected to the gas inlet of the alkali scrubber 2; the second input pipeline 12 is used to input ammonia-containing gas 102, and its gas outlet is connected to the gas inlet of the alkali scrubber 2; the third input pipeline 13 is used to input flash steam 103, and its gas outlet is connected to the gas inlet of the alkali scrubber 2; the gas outlet of the alkali scrubber 2 is connected to the gas inlet of the water scrubber 3, the gas outlet of the water scrubber 3 is connected to the gas inlet of the gas cabinet 4, and the gas outlet of the gas cabinet 4 is connected to the gas inlet of the compressor 5.

[0026] In the above technical solution, the system is designed with three input pipelines (first, second, and third input pipelines) capable of simultaneously processing three different waste gas sources: coal-to-hydrogen gasification gas 101, ammonia-containing gas 102, and flash steam 103. This multi-source waste gas treatment design improves the system's flexibility and adaptability. Secondly, the installation of an alkali scrubber 2 effectively removes acidic substances from the coal-to-hydrogen gasification gas 101, ammonia-containing gas 102, and flash steam 103. Furthermore, a water scrubber 3 removes NH3, oil, and dust. The treated exhaust gas is buffered in a gas tank 4 and then pressurized by a compressor 5 for delivery to subsequent devices or systems. The installation of the alkali scrubber 2 and water scrubber 3 effectively purifies the exhaust gas, which is then stored in the gas tank 4, enabling exhaust gas recycling and increasing resource utilization.

[0027] In one embodiment, reference Figure 1 As shown, the exhaust gas recovery system also includes a first connecting pipeline 21, a second connecting pipeline 22 and a third connecting pipeline 23; one end of the first connecting pipeline 21 is connected to the air outlet of the alkali washing tower 2, and the other end is connected to the air inlet of the water washing tower 3; one end of the second connecting pipeline 22 is connected to the air outlet of the water washing tower 3, and the other end is connected to the air inlet of the gas cabinet 4; one end of the third connecting pipeline 23 is connected to the air outlet of the gas cabinet 4, and the other end is connected to the air inlet of the compressor 5.

[0028] First, the exhaust gas undergoes preliminary treatment in an alkali scrubber 2 to neutralize acidic substances and reduce harmful gas components. Subsequently, it undergoes further scrubbing in a water scrubber 3 to remove residual alkaline substances and other water-soluble contaminants. This dual purification process significantly improves gas purification efficiency, resulting in cleaner exhaust gas. The gas exiting the gasholder 4 is further compressed by a compressor 5 and can be reused in industrial production (e.g., as feed gas for certain processes) or safely discharged into the atmosphere. Because it has been fully purified in the previous steps, the risk of environmental pollution is reduced.

[0029] Optionally, refer to Figure 1 As shown, the exhaust gas recovery system further includes a fourth input pipeline 14 , which is used to input liquid nitrogen-washed tail gas 104 and has a gas outlet connected to the first connecting pipeline 21 .

[0030] In this embodiment, liquid nitrogen scrubbing is an effective purification process, primarily used to remove certain impurities (such as carbon dioxide and hydrogen sulfide) from gases. By introducing liquid nitrogen scrubbing tail gas 104, exhaust gas pretreatment can be performed at an early stage in the system, further reducing the burden on subsequent processing steps. Liquid nitrogen scrubbing tail gas 104 typically contains lower concentrations of these impurities or other components after cooling, helping to dilute and neutralize harmful components in the original exhaust gas.

[0031] Secondly, the cooling energy generated during the liquid nitrogen washing process can be utilized through appropriate heat exchange design, for example, to pre-cool the gas entering the caustic washing tower 2, thereby reducing the energy consumption of the entire system. In addition, if the liquid nitrogen washing tail gas 104 contains recyclable components, they can also be effectively separated and recovered through this system, achieving efficient resource utilization.

[0032] In another embodiment, referring to Figure 1 As shown, the exhaust gas recovery system further includes a fourth connecting pipe 24 and a steam generator 6 ; one end of the fourth connecting pipe 24 is connected to the first air outlet 51 of the compressor 5 , and the other end is connected to the air inlet of the steam generator 6 .

[0033] In this embodiment, the gas processed by compressor 5 typically has a relatively high pressure and temperature. By directing this high-pressure gas to steam generator 6, its remaining energy (thermal and pressure energy) can be utilized to generate steam. This not only improves the energy efficiency of the entire system but also reduces dependence on external energy sources, achieving the goal of energy conservation and emission reduction. Furthermore, the introduction of steam generator 6 enables the exhaust gas recovery system to go beyond purification and recovery and can be combined with other processes (such as heating and evaporation). This increases the system's versatility and adaptability, allowing the operating mode to be adjusted according to actual needs to meet the requirements of different operating conditions.

[0034] Optionally, refer to Figure 1 As shown, the exhaust gas recovery system further includes a fifth connecting pipe 25 and a boiler 7 ; one end of the fifth connecting pipe 25 is connected to the second air outlet 52 of the compressor 5 , and the other end is connected to the air inlet of the boiler 7 .

[0035] In this embodiment, by directing a portion of the exhaust gas from compressor 5 to boiler 7, this gas's thermal energy can be utilized or used as combustion support gas, thereby increasing the energy efficiency of the entire system. Furthermore, when the exhaust gas contains combustible components, directing them to the boiler for combustion not only reduces the amount of harmful substances directly emitted into the atmosphere but also effectively utilizes the energy generated by this gas, reducing environmental pollution.

[0036] In other embodiments, referring to Figure 1 As shown, the exhaust gas recovery system further includes a sixth connecting pipe 26 and a waste heat recovery device 8 , one end of the sixth connecting pipe 26 is connected to the gas outlet of the boiler 7 , and the other end is connected to the gas inlet of the waste heat recovery device 8 .

[0037] In this embodiment, the high-temperature exhaust gas from boiler 7 is introduced into waste heat recovery device 8 via sixth connecting pipe 26, where heat energy is recovered from the exhaust gas. This not only reduces energy waste but also allows the recovered energy to be reused for preheating feedwater, providing hot water, or other process flows, thereby improving overall energy efficiency. Secondly, the exhaust gas from boiler 7 carries a large amount of unused heat energy directly into the atmosphere, resulting in heat loss. The introduction of waste heat recovery device 8 effectively captures this heat, reducing energy loss and lowering operating costs.

[0038] Optionally, refer to Figure 1 As shown, the exhaust gas recovery system further includes a seventh connecting pipe 27 and a gasification device 9 , one end of the seventh connecting pipe 27 is connected to the gas outlet of the steam generator 6 , and the other end is connected to the gas inlet of the gasification device 9 .

[0039] In this embodiment, the steam or exhaust gas generated by the steam generator 6 is introduced into the gasification device 9 via the seventh connecting line 27. These gases can be further processed, thereby more efficiently utilizing heat and gas resources and reducing waste. Furthermore, the gasification device 9 can be used to produce syngas (a mixture of carbon monoxide and hydrogen), which can be used as a raw material for chemical production, thereby increasing the added value of the final product. For example, syngas can be used in the production of methanol, ammonia, and other chemicals.

[0040] In one embodiment, reference Figure 1 As shown, the exhaust gas recovery system also includes a first waste liquid pipeline 28 and a second waste liquid pipeline 29. The inlet of the first waste liquid pipeline 28 is connected to the discharge port of the alkali washing tower 2; the inlet of the second waste liquid pipeline 29 is connected to the discharge port of the water washing tower 3.

[0041] In this embodiment, the specially designed first waste liquid pipeline 28 and second waste liquid pipeline 29 can effectively collect and manage the waste liquid generated by the alkali washing tower 2 and the water washing tower 3 during the purification process, which helps to prevent untreated chemical wastewater from being directly discharged into the environment and reduce pollution to the environment.

[0042] In addition, in another embodiment, referring to Figure 1 As shown, the exhaust gas recovery system also includes a fourth connecting pipe 24 and a steam generator 6; one end of the fourth connecting pipe 24 is connected to the first air outlet 51 of the compressor 5, and the other end is connected to the air inlet of the steam generator 6; the exhaust gas recovery system also includes a fifth connecting pipe 25 and a boiler 7; one end of the fifth connecting pipe 25 is connected to the second air outlet 52 of the compressor 5, and the other end is connected to the air inlet of the boiler 7; wherein, the outlet of the first waste liquid pipe 28 is used to be connected to the liquid inlet of the steam generator 6 and / or the boiler 7; and / or, the outlet of the second waste liquid pipe 29 is used to be connected to the liquid inlet of the steam generator 6 and / or the boiler 7.

[0043] In this embodiment, the inlet of the first waste liquid pipeline 28 is connected to the discharge port of the alkali washing tower 2, and the outlet can be connected to the liquid inlet of the steam generator 6 and / or the boiler 7; the inlet of the second waste liquid pipeline 29 is connected to the discharge port of the water washing tower 3, and the outlet can also be connected to the liquid inlet of the steam generator 6 and / or the boiler 7.

[0044] First, by introducing the waste liquid generated by the alkaline scrubber 2 and the water scrubber 3 into the steam generator 6 and boiler 7 via the first waste liquid pipeline 28 and the second waste liquid pipeline 29, respectively, the potentially useful components in the waste liquid can be effectively utilized. For example, the chemicals in the alkaline waste liquid can be neutralized or participate in other chemical reactions in the boiler 7 or steam generator 6, thereby reducing the need for additional chemical additions. Furthermore, the waste liquid typically contains a certain amount of heat. Introducing it into the steam generator 6 or boiler 7 can utilize this heat, reducing the fuel consumption required for heating, thereby improving the overall energy efficiency of the system.

[0045] In addition to recovering excess energy, steam generator 6 can also convert waste liquid generated in first waste liquid pipeline 28 and / or second waste liquid pipeline 29 into a high-temperature gasifying agent, providing a gasifying medium for the gasification device. For example, steam generator 6 can be a gas-fired steam generator. Pretreated low-heat exhaust gas enters the gas-fired steam generator. The pressurized gas generator draws air through a custom-made gas-fired steam generator to cause combustion. The pretreated wastewater is sprayed into the combustion chamber. The wastewater directly contacts the high-temperature flue gas for heat exchange, converting it into a gasifying agent (superheated steam, nitrogen dioxide, etc.).

[0046] In other embodiments, referring to Figure 1As shown, a first side wall inlet and a second side wall inlet are formed on the side wall of the first input pipeline 11 , an air outlet of the second input pipeline 12 is communicated with the first side wall inlet, and an air outlet of the third input pipeline 13 is communicated with the second side wall inlet.

[0047] In this embodiment, by providing two independent inlets on the sidewall of first input pipeline 11, connected to second input pipeline 12 and third input pipeline 13, respectively, effective mixing and control of multiple source gases is achieved. This approach not only improves the accuracy and flexibility of gas mixing, but also helps optimize reaction conditions, maintain system pressure balance and stability, and prevent gas backflow and contamination.

[0048] The preferred embodiments of the present disclosure are described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details of the above embodiments. Within the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all fall within the scope of protection of the present disclosure.

[0049] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present disclosure will not further describe various possible combinations.

[0050] In addition, the various embodiments of the present disclosure may be arbitrarily combined, and as long as they do not violate the concept of the present disclosure, they should also be regarded as the contents disclosed by the present disclosure.

Claims

1. An exhaust gas recovery system, characterized in that: The exhaust gas recovery system includes a first input pipeline, a second input pipeline, a third input pipeline, an alkali washing tower, a water washing tower, a gas cabinet and a compressor; The first input pipeline is used to input coal-to-hydrogen gas, and its gas outlet is connected to the gas inlet of the alkali scrubber; the second input pipeline is used to input ammonia-containing gas, and its gas outlet is connected to the gas inlet of the alkali scrubber; the third input pipeline is used to input flash steam, and its gas outlet is connected to the gas inlet of the alkali scrubber; The air outlet of the alkali washing tower is connected to the air inlet of the water washing tower, the air outlet of the water washing tower is connected to the air inlet of the gas cabinet, and the air outlet of the gas cabinet is connected to the air inlet of the compressor.

2. The exhaust gas recovery system according to claim 1, characterized in that: The exhaust gas recovery system further includes a first connecting pipeline, a second connecting pipeline and a third connecting pipeline; One end of the first connecting pipe is connected to the air outlet of the alkali washing tower, and the other end is connected to the air inlet of the water washing tower; One end of the second connecting pipe is connected to the air outlet of the water scrubber, and the other end is connected to the air inlet of the gas cabinet; One end of the third connecting pipe is connected to the air outlet of the gas cabinet, and the other end is connected to the air inlet of the compressor.

3. The exhaust gas recovery system according to claim 2, characterized in that: The exhaust gas recovery system further includes a fourth input pipeline, which is used to input liquid nitrogen to wash the tail gas and has a gas outlet connected to the first connecting pipeline.

4. The exhaust gas recovery system according to claim 1, characterized in that: The exhaust gas recovery system further includes a fourth connecting pipeline and a steam generator; One end of the fourth communicating pipe is communicated with the first air outlet of the compressor, and the other end is communicated with the air inlet of the steam generator.

5. The exhaust gas recovery system according to claim 4, characterized in that: The exhaust gas recovery system further includes a fifth connecting pipeline and a boiler; One end of the fifth communicating pipe is communicated with the second air outlet of the compressor, and the other end is communicated with the air inlet of the boiler.

6. The exhaust gas recovery system according to claim 5, characterized in that: The exhaust gas recovery system further includes a sixth communicating pipe and a waste heat recovery device, one end of the sixth communicating pipe is communicated with the gas outlet of the boiler, and the other end is communicated with the gas inlet of the waste heat recovery device.

7. The exhaust gas recovery system according to claim 4, characterized in that: The exhaust gas recovery system further includes a seventh connecting pipe and a gasification device. One end of the seventh connecting pipe is connected to the gas outlet of the steam generator, and the other end is connected to the gas inlet of the gasification device.

8. The exhaust gas recovery system according to claim 1, characterized in that: The exhaust gas recovery system further includes a first waste liquid pipeline and a second waste liquid pipeline, wherein the inlet of the first waste liquid pipeline is connected to the drain port of the alkali washing tower; the inlet of the second waste liquid pipeline is connected to the drain port of the water washing tower.

9. The exhaust gas recovery system according to claim 8, characterized in that: The exhaust gas recovery system further includes a fourth connecting pipeline and a steam generator; One end of the fourth communicating pipe is communicated with the first air outlet of the compressor, and the other end is communicated with the air inlet of the steam generator; The exhaust gas recovery system further includes a fifth connecting pipeline and a boiler; One end of the fifth communicating pipe is connected to the second air outlet of the compressor, and the other end is connected to the air inlet of the boiler; Wherein, the outlet of the first waste liquid pipeline is used to communicate with the liquid inlet of the steam generator and / or boiler; and / or, the outlet of the second waste liquid pipeline is used to communicate with the liquid inlet of the steam generator and / or boiler.

10. The exhaust gas recovery system according to claim 1, characterized in that: A first sidewall inlet and a second sidewall inlet are formed on the sidewall of the first input pipeline. An air outlet of the second input pipeline is communicated with the first sidewall inlet. An air outlet of the third input pipeline is communicated with the second sidewall inlet.

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