A waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation

Abstract

The present invention discloses a waste-pressure turbine power generation, refrigeration, and waste heat recovery system based on syngas internal combustion engine power generation. The system comprises a syngas pretreatment module, a turbine power generation module, an internal combustion engine power generation module, a gas-liquid separator tank I, a waste heat utilization module, and a refrigeration cycle module. The turbine power generation module comprises a turbine expansion generator I, a heat exchanger I, a turbine expansion generator II, a heat exchanger II, a turbine expansion generator III, and a heat exchanger III, which are connected in sequence. The outlet of the turbine expansion generator III is connected to the air inlet of the internal combustion engine power generation module. Heat exchangers I, II, and III are each connected to a carbon dioxide gas pipeline. The outputs of heat exchangers I, II, and III are connected to the gas-liquid separator tank I. The refrigeration cycle module comprises a lithium bromide refrigerator, a liquid storage tank I, a liquid supply pump I, a liquid storage tank II, and a liquid supply pump II. The present invention achieves cascaded and efficient energy utilization, recovers waste heat, is environmentally friendly, and significantly improves the overall energy efficiency of the system.

Description

Technical Field

[0001] The present invention relates to the technical field of energy utilization, and in particular to a waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation. Background Art

[0002] Amidst the growing challenges of energy shortages and environmental pollution, the efficient utilization of syngas, a clean energy source generated by gasifying coal, biomass, and waste, has garnered widespread attention. Syngas internal combustion engine power generation technology, with its advantages of fuel adaptability and flexible deployment, has become a key method for syngas energy conversion. However, current syngas internal combustion engine power generation systems still suffer from significant deficiencies in energy cascade utilization, waste heat recovery, and environmental performance, hindering improvements in their overall energy efficiency.

[0003] In the existing technology, the pretreatment process of syngas before entering the internal combustion engine is relatively simple, usually only through a single purification or cooling step, and fails to fully utilize the pressure energy and thermal energy carried by the syngas itself. For example, during the transportation process of syngas, pressure fluctuations often lead to unstable intake of the internal combustion engine, affecting combustion efficiency; at the same time, if the carbon dioxide component contained in the syngas enters the internal combustion engine directly, it will not only reduce combustion efficiency, but also increase greenhouse gas emissions in the exhaust gas. In addition, although some systems attempt to perform preliminary expansion of syngas to generate electricity, they lack a staged recovery and power generation design for the expansion process, resulting in the failure to efficiently convert the pressure energy of the high-pressure syngas step by step, resulting in energy waste.

[0004] When it comes to waste heat recovery, traditional syngas internal combustion engine systems utilize a single method for exhaust heat and cylinder cooling water waste heat. Most systems use exhaust heat for simple heating or direct discharge, failing to integrate it with process requirements for multi-functional waste heat utilization. Furthermore, waste heat from the engine's cylinder water is typically dissipated solely through a cooling cycle, without integrating it with refrigeration equipment, resulting in wasted medium- and low-temperature waste heat.

[0005] In addition, the carbon dioxide recovery technology in synthesis gas has a low degree of integration in the existing system. Most carbon dioxide recovery devices are independent of the power generation system and require additional energy for separation and purification, which not only increases the system energy consumption but also reduces the overall economic efficiency.

[0006] In response to the above problems, how to build an integrated system that can achieve graded recovery of synthesis gas pressure energy, cascade utilization of waste heat, efficient capture of carbon dioxide and coordinated supply of multiple energies has become the key to improving the efficiency of synthesis gas energy utilization. In order to break through the bottleneck of low comprehensive energy efficiency and single function of the current synthesis gas internal combustion engine system, the present invention has designed a waste pressure turbine power generation refrigeration and waste heat recovery and utilization system based on synthesis gas internal combustion engine power generation using system integration and optimization technology. Summary of the Invention

[0007] In order to solve the problems raised in the above background technology, the present invention provides a waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation.

[0008] To achieve the above objectives, the present invention provides the following technical solutions: a waste pressure turbine power generation, refrigeration and waste heat recovery system based on syngas internal combustion engine power generation, comprising a syngas pretreatment module, a turbine power generation module, an internal combustion engine power generation module, a gas-liquid separation tank I, a waste heat utilization module and a refrigeration cycle module;

[0009] The synthesis gas pretreatment module includes a heat exchanger I, a heat exchanger II and a gas-liquid separation tank II connected in sequence, and the gas phase outlet of the gas-liquid separation tank II is connected to the turbine power generation module;

[0010] The turbine power generation module includes a turbine expansion generator I, a heat exchanger I, a turbine expansion generator II, a heat exchanger II, a turbine expansion generator III, and a heat exchanger III connected in sequence. The outlet of the turbine expansion generator III is connected to the air inlet of the internal combustion engine power generation module. The heat exchangers I, II, and III are respectively connected to a carbon dioxide gas pipeline. The outputs of the heat exchangers I, II, and III are connected to a gas-liquid separation tank I. The output of the gas-liquid separation tank I is provided with a liquid carbon dioxide pipeline and a non-condensable gas discharge pipeline.

[0011] The waste heat utilization module includes a heat exchanger IV, a denitrification device and a biomass dryer. The internal combustion engine power generation module includes an internal combustion engine and a generator. The exhaust port of the internal combustion engine is connected to the heat exchanger IV, the heat exchanger IV is connected to the denitrification device, and the outlet of the denitrification device is connected to the biomass dryer.

[0012] The refrigeration cycle module includes a lithium bromide refrigerator, a liquid storage tank I, a liquid supply pump I, a liquid storage tank II and a liquid supply pump II. The internal combustion engine is provided with a cylinder water circulation pipeline, and a heat exchanger V and a liquid supply pump III are provided on the cylinder water circulation pipeline. The lithium bromide refrigerator is connected to the heat exchanger V, and the refrigerant outlet of the lithium bromide refrigerator is connected to the inlet of the liquid storage tank I. The outlet of the liquid storage tank I is output and connected to the liquid storage tank II after passing through the liquid supply pump I and the heat exchanger II. The output of the liquid supply pump I is provided with an external cold equipment pipeline, and an external cold water equipment pipeline is provided between the liquid supply pump I and the heat exchanger II. The liquid storage tank II is input to the lithium bromide refrigerator through the liquid supply pump II, and the input pipeline of the liquid storage tank II is also connected with an external cold equipment pipeline.

[0013] As preferred in the present invention, the initial synthesis gas of the synthesis gas pretreatment module is desulfurized and dehydrated synthesis gas, and the dew point temperature is 0 to -60°C.

[0014] In this embodiment, such a setting can prevent the sulfur and moisture in the synthesis gas from corroding subsequent equipment and affecting the operating efficiency of the system.

[0015] As a preferred embodiment of the present invention, the cold side medium of the heat exchanger II is the refrigerant produced by a lithium bromide refrigerator, and the cold side inlet temperature of the heat exchanger II is 3-30°C.

[0016] As a preferred embodiment of the present invention, a drain valve is provided at the bottom of the gas-liquid separation tank II, and the drain valve is provided with a liquid discharge pipeline.

[0017] As a preferred embodiment of the present invention, the heat exchanger I, heat exchanger II, heat exchanger III, heat exchanger IV and heat exchanger V are all plate heat exchangers.

[0018] As a preferred embodiment of the present invention, the connecting pipelines of the carbon dioxide gas pipeline and the heat exchanger I, heat exchanger II and heat exchanger III are respectively provided with a flow meter, a thermometer and a regulating valve, and the heat exchanger I, heat exchanger II and heat exchanger III are provided with inlet and outlet temperature sensors. The flow meter and thermometer are used for monitoring, and the regulating valve forms an interlocking control with the inlet and outlet temperature sensors.

[0019] As preferred embodiment of the present invention, the operating pressure of the gas-liquid separation tank I is 0.8-3.0 MPa, the operating temperature is -30 to -10°C, and the outlet of the liquid carbon dioxide pipeline is connected to a low-temperature storage tank.

[0020] As a preferred embodiment of the present invention, the exhaust temperature of the exhaust port of the internal combustion engine is 450-550°C.

[0021] As preferred embodiment of the present invention, the refrigeration capacity adjustment range of the lithium bromide refrigerator is 100-1000kW, the inlet water temperature of the heat source is 80-95°C, and the outlet water temperature is 70-75°C.

[0022] As preferred embodiment of the present invention, the flow rate adjustment range of the liquid supply pump I and the liquid supply pump II is 5-50m 3 / h, the liquid supply pump I forms an interlocking control with the liquid level sensor of the liquid storage tank I, and the liquid supply pump II forms an interlocking control with the liquid level sensor of the liquid storage tank II.

[0023] By adopting the above technical solution, the present invention has the following advantages compared with the prior art:

[0024] 1. The synthesis gas first enters the synthesis gas pretreatment module, undergoes preliminary heat exchange and cooling in heat exchanger I, and then enters heat exchanger II to exchange heat with the refrigerant produced by the lithium bromide refrigerator to further reduce the temperature. Then, it enters the gas-liquid separation tank II to separate the liquid substances produced by the cooling in the synthesis gas. The separated liquid substances are discharged through the gas-liquid separation tank II, and the gaseous part enters the turbine power generation module. In the turbine power generation module, the synthesis gas uses high-pressure potential energy to first enter the turbine expansion generator I to drive the turbine expansion generator I to generate electricity, and then enters the heat exchanger I to exchange heat with the carbon dioxide input from the carbon dioxide gas pipeline, and then enters the turbine expansion generator II to drive power generation, and then exchanges heat with carbon dioxide through heat exchanger II, and then enters the turbine expansion generator III to drive power generation, and exchanges heat with carbon dioxide through heat exchanger III. The carbon dioxide coming out of heat exchanger I, heat exchanger II and heat exchanger III enters the gas-liquid separation tank I for distillation, and the obtained liquid carbon dioxide and non-condensable gas are distilled through turbine expansion generator I, turbine expansion generator II and turbine expansion Generator III is capable of tiered recovery of the high-pressure potential energy of the syngas to generate electricity, achieving efficient, step-by-step conversion. Simultaneously, heat exchangers I, II, and III are used to gradually cool the syngas, creating favorable conditions for liquid CO2 recovery. The cooling energy generated during the syngas cooling process is used to condense and separate the CO2 gas, resulting in a liquid CO2 recovery rate exceeding 90%. The CO2 is efficiently captured and recovered, eliminating the need for additional energy for separation and purification, thus avoiding increased system energy consumption and ensuring economic efficiency. Furthermore, the CO2 component is prevented from directly entering the internal combustion engine, ensuring combustion efficiency and avoiding increased greenhouse gas emissions in the exhaust. Furthermore, non-condensable gases can be directly discharged or further utilized. After passing through turbine expansion generator III, the syngas enters the internal combustion engine of the internal combustion engine power generation module for combustion and power generation. The exhaust waste heat from the internal combustion engine is treated by heat exchanger IV and a denitrification device and then used for drying in the biomass dryer. The waste heat from the cylinder water is passed through heat exchanger V to drive a lithium bromide refrigerator for refrigeration. The entire process achieves efficient, cascaded energy utilization, recovers waste heat, is environmentally friendly, and significantly improves the overall energy efficiency of the system.

[0025] 2. The lithium bromide refrigerator uses the waste heat of cylinder water as the driving heat source. The refrigerant generated is not only used to cool the synthesis gas in the heat exchanger II of the synthesis gas pretreatment module, but can also provide cooling for external equipment through the external cooling equipment pipeline. At the same time, it can be flexibly linked with the external refrigeration system through the external cooling water equipment pipeline and the external cooling equipment pipeline, reducing the dependence on electric cooling. The refrigeration system has a high degree of integration and is linked with the refrigeration equipment. The medium and low temperature waste heat is recycled and utilized, and the energy-saving effect is significant.

[0026] 3. The entire system of the present invention realizes an integrated system for graded recovery of synthesis gas pressure energy, cascade utilization of waste heat, efficient capture of carbon dioxide and coordinated supply of multiple energies, which greatly improves the energy utilization efficiency of synthesis gas and has the characteristics of high comprehensive energy efficiency and rich functions of the synthesis gas internal combustion engine system. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0028] Figure 1 It is a schematic diagram of the system principle of the present invention;

[0029] In the figure: 1. Gas-liquid separation tank I; 2. Heat exchanger I; 3. Heat exchanger II; 4. Gas-liquid separation tank II; 5. Turbine expansion generator I; 6. Heat exchanger I; 7. Turbine expansion generator II; 8. Heat exchanger II; 9. Turbine expansion generator III; 10. Heat exchanger III; 11. Carbon dioxide gas pipeline; 12. Liquid carbon dioxide pipeline; 13. Non-condensable gas discharge pipeline; 14. Heat exchanger IV; 15. Denitrification device; 16. Biomass Dryer; 17. Internal combustion engine; 18. Generator; 19. Lithium bromide refrigerator; 20. Liquid storage tank I; 21. Liquid supply pump I; 22. Liquid storage tank II; 23. Liquid supply pump II; 24. Cylinder water circulation pipeline; 25. Heat exchanger V; 26. Liquid supply pump III; 27. External cooling equipment pipeline; 28. External cooling water equipment pipeline; 29. ​​External cooling equipment pipeline; 30. Expander; 31. Expansion generator; 32. Drain valve; 33. Drain pipeline. DETAILED DESCRIPTION

[0030] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0031] See also Figure 1 The present invention provides a technical solution: a waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation, including a synthesis gas pretreatment module, a turbine power generation module, an internal combustion engine power generation module, a gas-liquid separation tank I1, a waste heat utilization module and a refrigeration cycle module;

[0032] The synthesis gas pretreatment module includes a heat exchanger I2, a heat exchanger II3 and a gas-liquid separation tank II4 connected in sequence, and the gas phase outlet of the gas-liquid separation tank II4 is connected to the turbine power generation module;

[0033] The turbine power generation module includes a turbine expansion generator I5, a heat exchanger I6, a turbine expansion generator II7, a heat exchanger II8, a turbine expansion generator III9, and a heat exchanger III10 connected in sequence. The outlet of the turbine expansion generator III9 is ​​connected to the air inlet of the internal combustion engine power generation module. The heat exchangers I6, II8, and III10 are respectively connected to a carbon dioxide gas pipeline 11. The outputs of the heat exchangers I6, II8, and III10 are connected to a gas-liquid separation tank I1. The output of the gas-liquid separation tank I1 is provided with a liquid carbon dioxide pipeline 12 and a non-condensable gas discharge pipeline 13.

[0034] The waste heat utilization module includes a heat exchanger IV14, a denitrification device 15 and a biomass dryer 16. The internal combustion engine power generation module includes an internal combustion engine 17 and a generator 18. The exhaust port of the internal combustion engine 17 is connected to the heat exchanger IV14, and the heat exchanger IV14 is connected to the denitrification device 15. The outlet of the denitrification device 15 is connected to the biomass dryer 16.

[0035] The refrigeration cycle module includes a lithium bromide refrigerator 19, a liquid storage tank I20, a liquid supply pump I21, a liquid storage tank II22 and a liquid supply pump II23. The internal combustion engine 17 is provided with a cylinder water circulation pipeline 24, and a heat exchanger V25 and a liquid supply pump III26 are provided on the cylinder water circulation pipeline 24. The lithium bromide refrigerator 19 is connected to the heat exchanger V25. The refrigerant outlet of the lithium bromide refrigerator 19 is connected to the inlet of the liquid storage tank I20. The outlet of the liquid storage tank I20 is output and connected to the liquid storage tank II22 after passing through the liquid supply pump I21 and the heat exchanger II3. The output of the liquid supply pump I21 is provided with an external cold equipment pipeline 27. An external cold water equipment pipeline 28 is provided between the liquid supply pump I21 and the heat exchanger II3. The liquid storage tank II22 is input to the lithium bromide refrigerator 19 through the liquid supply pump II23, and an external cold equipment pipeline 29 is connected to the input pipeline of the liquid storage tank II22.

[0036] In this embodiment, the synthesis gas first enters the synthesis gas pretreatment module, undergoes preliminary heat exchange and cooling in the heat exchanger I2, then enters the heat exchanger II3, exchanges heat with the refrigerant produced by the lithium bromide refrigerator 19 to further reduce the temperature, and then enters the gas-liquid separation tank II4 to separate the liquid substances produced in the synthesis gas due to cooling. The separated liquid substances are discharged through the gas-liquid separation tank II4, and the gaseous part enters the turbine power generation module. In the turbine power generation module, the synthesis gas uses the high-pressure potential energy to first enter the turbine expansion generator I5, drive the turbine expansion generator I5 to work and generate electricity, and then enters the heat exchanger I6 to exchange heat with the carbon dioxide input from the carbon dioxide gas pipeline 11, and then enters the turbine expansion Generator II7 drives electricity generation, then exchanges heat with carbon dioxide through heat exchanger II8, and then enters turbine expansion generator III9 to drive electricity generation, and exchanges heat with carbon dioxide through heat exchanger III10. The carbon dioxide coming out of heat exchanger I6, heat exchanger II8 and heat exchanger III10 enters gas-liquid separation tank I1 for rectification. The obtained liquid carbon dioxide and non-condensable gas are passed through turbine expansion generator I5, turbine expansion generator II7 and turbine expansion generator III9, which can recover the high-pressure potential energy of the synthesis gas in stages to generate electricity, achieving efficient conversion step by step. At the same time, the heat exchanger I6, heat exchanger II8 and heat exchanger III10 are used to gradually cool the synthesis gas, creating favorable conditions for liquid carbon dioxide recovery. The cooling capacity of the synthesis gas during the cooling process is used to condense and separate the carbon dioxide gas. The recovery rate of liquid carbon dioxide is more than 90%. The carbon dioxide is recovered and captured efficiently without the need for additional energy consumption for separation and purification, thus avoiding an increase in system energy consumption and ensuring economy. Secondly, the carbon dioxide component is prevented from directly entering the internal combustion engine 17, ensuring combustion efficiency and avoiding an increase in greenhouse gas emissions in the exhaust gas. The non-condensable gas can be directly discharged or further utilized. The synthesis gas after the turbine expansion generator III9 enters the internal combustion engine 17 of the internal combustion engine power generation module for combustion and power generation. The exhaust gas waste heat of the internal combustion engine 17 is processed by the heat exchanger IV14 and the denitrification device 15 and is used for drying in the biomass dryer 16. Of course, it can also be used for other functions. Energy equipment, the cylinder water waste heat drives the lithium bromide refrigerator 19 for refrigeration after passing through the heat exchanger V25. The whole process realizes the high-efficiency utilization of energy in a step-by-step manner, and the waste heat is recovered, which has environmental protection performance and greatly improves the comprehensive energy efficiency of the system; the lithium bromide refrigerator 19 uses the cylinder water waste heat as the driving heat source, and the refrigerant generated is not only used for the heat exchanger II3 of the synthesis gas pretreatment module to cool the synthesis gas, but also can be used to cool the external equipment through the external cooling equipment pipeline 27. At the same time, the external cooling water equipment pipeline 28 and the external cooling equipment pipeline 29 are used to realize flexible linkage with the external refrigeration system, reducing the dependence on electric refrigeration. The refrigeration system has a high degree of integration and is linked with the refrigeration equipment. The medium and low temperature waste heat is recycled and utilized, and the energy-saving effect is significant;The entire system of the present invention realizes an integrated system that realizes graded recovery of syngas pressure energy, cascade utilization of waste heat, efficient capture of carbon dioxide, and coordinated supply of multiple energies, greatly improving the energy utilization efficiency of syngas. It has the characteristics of high comprehensive energy efficiency and rich functions of syngas internal combustion engine system.

[0037] Specifically, the turbine power generation module is configured based on actual needs, with the required number of stages and turbine expander generators, including one or more stages. The number of heat exchangers can also be adjusted based on actual needs. Heat exchanger I2 performs preliminary heat exchange and cooling using a low-temperature medium. The internal combustion engine power generation module comprises an internal combustion engine 17, a generator 18, and a control system. Using internal combustion engine 17 as power, it drives generator 18 to convert the chemical energy of the fuel into electrical energy. This structure is conventional and is specifically controlled by the control system. Turbine expander generators I5, II7, and III9, respectively, include expanders 30 and generators 31. These components can be conventionally configured, offering high energy recovery, stable and reliable operation, superior environmental performance, precise top pressure control, low noise and vibration, strong adaptability, excellent heat dissipation, and high energy conversion efficiency. Replacing the gas-liquid separator I1 with a distillation tank can also achieve the same results. Denitrification device 15 is a selective catalytic reduction denitrification device that uses ammonia or urea as a reducing agent, achieving a denitrification efficiency of no less than 90%. The lithium bromide refrigerator 19 is a conventional component that uses thermal energy as its power source, requiring minimal energy. It can utilize various low-potential thermal energies, waste gases, and waste heat, resulting in efficient energy utilization, quiet and stable operation, safety, and environmental protection. It features a wide range of cooling capacity adjustment, strong adaptability, and easy installation and maintenance. Liquid supply pumps I 21, II 23, and III 26 provide a large liquid supply, increasing the refrigerant circulation rate.

[0038] As further preferred in the present invention, the initial synthesis gas of the synthesis gas pretreatment module is desulfurized and dehydrated synthesis gas, and the dew point temperature is 0 to -60°C.

[0039] In this embodiment, such a setting can prevent the sulfur and moisture in the synthesis gas from corroding subsequent equipment and affecting the operating efficiency of the system.

[0040] As further preferred in the present invention, the cold side medium of the heat exchanger II3 is the refrigerant produced by the lithium bromide refrigerator, and the cold side inlet temperature of the heat exchanger II3 is 3-30°C.

[0041] In this embodiment, the refrigerant in this temperature range can effectively cool the synthesis gas and ensure the effect of subsequent gas-liquid separation.

[0042] As further preferred embodiment of the present invention, a drain valve 32 is provided at the bottom of the gas-liquid separation tank II4 , and the drain valve 32 is provided with a liquid discharge pipeline 33 .

[0043] In this embodiment, the liquid substance at the bottom of the gas-liquid separation tank II4 can be regularly discharged through the drain valve 32 to prevent its accumulation from affecting the separation effect.

[0044] As further preferred in the present invention, heat exchanger I6, heat exchanger II8, heat exchanger III10, heat exchanger IV14 and heat exchanger V25 are all plate heat exchangers.

[0045] In this embodiment, the use of a plate heat exchanger can ensure heat exchange efficiency and smooth energy transfer.

[0046] Further as a preference of the present invention, the connecting pipelines of the carbon dioxide gas pipeline 11 and the heat exchanger I6, heat exchanger II8 and heat exchanger III10 are respectively provided with flow meters, thermometers and regulating valves, and the heat exchangers I6, heat exchangers II8 and heat exchangers III10 are provided with inlet and outlet temperature sensors, the flow meters and thermometers are used for monitoring, and the regulating valves form an interlocking control with the inlet and outlet temperature sensors.

[0047] In this embodiment, the flow meter, thermometer, regulating valve, and inlet and outlet temperature sensors are conventional existing technical components. Through interlocking control, the flow of carbon dioxide can be adjusted according to the inlet and outlet temperatures of heat exchanger I6, heat exchanger II8, and heat exchanger III10, thereby ensuring the stability of the heat exchange effect and facilitating the condensation and separation of carbon dioxide.

[0048] As further preferred in the present invention, the operating pressure of the gas-liquid separation tank I1 is 0.8-3.0 MPa, the operating temperature is -30 to -10°C, and the outlet of the liquid carbon dioxide pipeline 12 is connected to a low-temperature storage tank.

[0049] In this embodiment, under the operating conditions, carbon dioxide can be effectively distilled to improve the purity and recovery rate of liquid carbon dioxide. The cryogenic storage tank is a prior art component, and liquid carbon dioxide can be stored using the cryogenic storage tank.

[0050] As further preferred in the present invention, the exhaust temperature of the exhaust port of the internal combustion engine 17 is 450-550°C.

[0051] In this embodiment, the exhaust gas at this temperature has a high waste heat utilization value and can provide sufficient heat for the biomass dryer 16 .

[0052] As further preferred in the present invention, the cooling capacity adjustment range of the lithium bromide refrigerator 19 is 100-1000kW, the heat source inlet water temperature is 80-95°C, and the outlet water temperature is 70-75°C.

[0053] In this embodiment, such parameter settings enable the lithium bromide refrigerator 19 to fully utilize the waste heat of the cylinder water for refrigeration, thereby meeting different cooling needs.

[0054] As a further preferred embodiment of the present invention, the flow rate adjustment range of the liquid supply pump I21 and the liquid supply pump II23 is 5-50m 3 / h, the liquid supply pump I21 forms an interlock control with the liquid level sensor of the liquid storage tank I20, and the liquid supply pump II23 forms an interlock control with the liquid level sensor of the liquid storage tank II22.

[0055] In this embodiment, the liquid level sensor is a conventional prior art component. Through the interlocking control of the liquid level sensor and the liquid supply pump I21 and the liquid supply pump II23, the liquid level in the liquid storage tank I20 and the liquid storage tank II22 can be kept stable, ensuring the normal operation of the refrigeration system.

[0056] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus.

[0057] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation, characterized in that: It includes synthesis gas pretreatment module, turbine power generation module, internal combustion engine power generation module, gas-liquid separation tank I, waste heat utilization module and refrigeration cycle module; The synthesis gas pretreatment module includes a heat exchanger I, a heat exchanger II and a gas-liquid separation tank II connected in sequence, and the gas phase outlet of the gas-liquid separation tank II is connected to the turbine power generation module; The turbine power generation module includes a turbine expansion generator I, a heat exchanger I, a turbine expansion generator II, a heat exchanger II, a turbine expansion generator III, and a heat exchanger III connected in sequence. The outlet of the turbine expansion generator III is connected to the air inlet of the internal combustion engine power generation module. The heat exchangers I, II, and III are respectively connected to a carbon dioxide gas pipeline. The outputs of the heat exchangers I, II, and III are connected to a gas-liquid separation tank I. The output of the gas-liquid separation tank I is provided with a liquid carbon dioxide pipeline and a non-condensable gas discharge pipeline. The waste heat utilization module includes a heat exchanger IV, a denitrification device and a biomass dryer. The internal combustion engine power generation module includes an internal combustion engine and a generator. The exhaust port of the internal combustion engine is connected to the heat exchanger IV, the heat exchanger IV is connected to the denitrification device, and the outlet of the denitrification device is connected to the biomass dryer. The refrigeration cycle module includes a lithium bromide refrigerator, a liquid storage tank I, a liquid supply pump I, a liquid storage tank II and a liquid supply pump II. The internal combustion engine is provided with a cylinder water circulation pipeline, and a heat exchanger V and a liquid supply pump III are provided on the cylinder water circulation pipeline. The lithium bromide refrigerator is connected to the heat exchanger V, and the refrigerant outlet of the lithium bromide refrigerator is connected to the inlet of the liquid storage tank I. The outlet of the liquid storage tank I is output and connected to the liquid storage tank II after passing through the liquid supply pump I and the heat exchanger II. The output of the liquid supply pump I is provided with an external cold equipment pipeline, and an external cold water equipment pipeline is provided between the liquid supply pump I and the heat exchanger II. The liquid storage tank II is input to the lithium bromide refrigerator through the liquid supply pump II, and the input pipeline of the liquid storage tank II is also connected with an external cold equipment pipeline.

2. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized by: The initial synthesis gas of the synthesis gas pretreatment module is desulfurized and dehydrated synthesis gas, and the dew point temperature is 0 to -60°C.

3. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized in that: The cold side medium of the heat exchanger II is the refrigerant produced by the lithium bromide refrigerator, and the cold side inlet temperature of the heat exchanger II is 3-30°C.

4. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized in that: A drain valve is provided at the bottom of the gas-liquid separation tank II, and the drain valve is provided with a liquid discharge pipeline.

5. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized in that: The heat exchanger I, heat exchanger II, heat exchanger III, heat exchanger IV and heat exchanger V are all plate heat exchangers.

6. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized by: The connecting pipelines of the carbon dioxide gas pipeline and heat exchanger I, heat exchanger II and heat exchanger III are respectively provided with flow meters, thermometers and regulating valves. The heat exchangers I, heat exchanger II and heat exchanger III are provided with inlet and outlet temperature sensors. The flow meters and thermometers are used for monitoring. The regulating valves form an interlocking control with the inlet and outlet temperature sensors.

7. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized in that: The operating pressure of the gas-liquid separation tank I is 0.8-3.0 MPa, the operating temperature is -30 to -10°C, and the outlet of the liquid carbon dioxide pipeline is connected to a low-temperature storage tank.

8. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized in that: The exhaust temperature of the exhaust port of the internal combustion engine is 450-550°C.

9. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1 is characterized in that: The refrigeration capacity adjustment range of the lithium bromide refrigerator is 100-1000kW, the inlet water temperature of the heat source is 80-95°C, and the outlet water temperature is 70-75°C.

10. The waste pressure turbine power generation, refrigeration and waste heat recovery system based on synthesis gas internal combustion engine power generation according to claim 1, characterized in that: The flow rate adjustment range of the liquid supply pump I and the liquid supply pump II is 5-50m 3 / h, the liquid supply pump I forms an interlocking control with the liquid level sensor of the liquid storage tank I, and the liquid supply pump II forms an interlocking control with the liquid level sensor of the liquid storage tank II.

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