Terminal integrated internal combustion engine combined cooling heating and power supply system and control method thereof

Abstract

The invention provides a terminal integrated internal combustion engine combined cooling heating and power system and a control method thereof, and relates to the technical field of combined cooling heating and power, and the terminal integrated internal combustion engine combined cooling heating and power system comprises an internal combustion engine power generation and multi-grade waste heat generation unit, a flue gas waste heat gradient utilization unit, an organic Rankine cycle power generation unit and a low-temperature waste heat recovery unit. According to the system, four units are cooperatively connected, multi-grade waste heat generated by power generation of an internal combustion engine is subjected to cascade distribution and total recovery, flue gas waste heat gives consideration to refrigeration, ORC power generation heat source and first low-temperature heat source supply, ORC power generation synchronously recovers condensation waste heat to form a second low-temperature heat source, and the low-temperature waste heat recovery unit intensively improves three types of low-temperature waste heat grades. The problems that a traditional system is insufficient in waste heat utilization and low in energy grade matching degree can be solved, and the effects of improving the comprehensive energy utilization efficiency and achieving efficient combined supply of cooling, heating and power are achieved.

Description

Technical Field

[0001] This application relates to the field of combined cooling, heating and power (CCHP) technology, and in particular to a terminal integrated CCHP system for internal combustion engines and its control method. Background Technology

[0002] Combined cooling, heating and power (CCHP) systems with gas-fired internal combustion engines as the core are a typical form of distributed energy utilization. During the power generation process, such systems generate multi-grade waste heat, including high-temperature flue gas, high-temperature cooling water, and low-temperature cooling water. However, the relevant technologies have significant defects in the recovery and utilization of this multi-grade waste heat, and have failed to achieve full-spectrum cascade utilization.

[0003] In related technologies, not only is the waste heat from the low-temperature cooling water of the internal combustion engine treated as waste heat and discharged through the cooling tower, but there is also a lack of effective means to recover the medium-temperature waste heat. Furthermore, the high-temperature flue gas is not rationally allocated and utilized in stages. The waste heat recovery chain is incomplete, resulting in a situation where high-grade waste heat is partially recovered while a large amount of low-grade waste heat is wasted. Ultimately, this leads to a low overall energy utilization rate of the system and makes it difficult to further improve the overall power generation capacity of the system through the effective utilization of waste heat. Summary of the Invention

[0004] This application provides a terminal integrated internal combustion engine combined cooling, heating and power system and its control method, which can solve the problems in related technologies where a large amount of low-temperature waste heat is wasted because the multi-grade waste heat generated by the internal combustion engine is not fully utilized in a cascade manner, high-temperature flue gas is not rationally allocated and utilized, additional power generation is not achieved through medium-temperature waste heat, and various low-temperature waste heat is not collected in a centralized manner and its thermal energy grade is not improved for utilization.

[0005] According to a first aspect of this application, a terminal-integrated combined cooling, heating and power system for an internal combustion engine is provided, comprising:

[0006] Internal combustion engine power generation and multi-grade waste heat generation unit, flue gas waste heat cascade utilization unit, organic Rankine cycle power generation unit, low temperature waste heat recovery unit; The internal combustion engine power generation and multi-grade waste heat generation unit is connected to the flue gas waste heat cascade utilization unit and the low temperature waste heat recovery unit respectively, and is used to generate power and generate multi-grade waste heat including high temperature flue gas, high temperature cooling water and low temperature cooling water. The waste heat recovery unit is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit, respectively, and is used to receive the high-temperature flue gas and distribute the high-temperature flue gas to drive cooling or heating, provide a medium-temperature power generation heat source for organic Rankine cycle power generation and provide a first low-temperature heat source. The organic Rankine cycle power generation unit is connected to the low-temperature waste heat recovery unit, and is used to generate electricity using the medium-temperature power generation heat source and generate a second low-temperature heat source. The low-temperature waste heat recovery unit is used to receive the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source carried by the low-temperature cooling water, and to improve the heat energy quality of the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source to output high-temperature hot water.

[0007] Optionally, the internal combustion engine power generation and multi-grade waste heat generation unit includes an internal combustion generator set, a high-temperature heat dissipation module, and a low-temperature heat dissipation module; The internal combustion generator set is connected to the flue gas waste heat utilization unit through a flue, which is used to transport the high-temperature flue gas generated by the internal combustion generator set to the flue gas waste heat utilization unit for subsequent cascade heat exchange and energy recovery. The high-temperature heat dissipation module is connected to the cooling system of the internal combustion generator set, and is used to recover the heat carried by the high-temperature cooling water and transport the recovered heat to the flue gas waste heat cascade utilization unit. The low-temperature heat dissipation module is connected to the cooling system of the internal combustion generator set and is used to recover the heat carried by the low-temperature cooling water, and to transport the recovered heat as the third low-temperature heat source to the low-temperature waste heat recovery unit and / or the flue gas waste heat cascade utilization unit.

[0008] Optionally, the high-temperature heat dissipation module includes a lubricating oil cooler and a cylinder liner water heat exchanger arranged in series, as well as a cylinder liner water pump, a temperature controller, and a three-way valve. The primary side of the lubricating oil cooler and the cylinder liner water heat exchanger are respectively connected to the lubricating oil cooling circuit and the cylinder liner water cooling circuit of the internal combustion generator set, for receiving and cooling high-temperature lubricating oil and cylinder liner water. The secondary side of the lubricating oil cooler and the cylinder liner water heat exchanger are connected in series to form an intermediate water circulation loop, which is used to absorb heat from the primary side and be heated. The temperature controller and the three-way valve are used to regulate the flow rate of the intermediate water circulation circuit to stabilize the return water temperature of the lubricating oil cooling circuit and the cylinder liner water cooling circuit.

[0009] Optionally, the low-temperature heat dissipation module includes a medium-cooled water heat exchanger, a medium-cooled water circulating pump, a temperature controller, a three-way valve, valve c, and valve e; The primary side of the intermediate cooling water heat exchanger includes the intermediate cooling water circulating pump, the three-way valve II, the intermediate cooling water heat exchanger, and the temperature controller II connected in sequence. The primary side of the intercooled water heat exchanger is connected to the cooling circuit of the turbocharged air intercooler of the internal combustion generator set, and is used to receive and cool the intercooled water. The temperature controller 2 and the three-way valve 2 are used to regulate the flow rate on the primary side of the intercooled water heat exchanger to stabilize the return water temperature of the cooling circuit of the pressurized air intercooler. The intermediate cooling water heat exchanger is connected to the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit through valve c to provide the third low-temperature heat source, and is connected to the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit through valve e to recover the utilized third low-temperature heat source.

[0010] Optionally, the flue gas waste heat cascade utilization unit includes a flue, a flue gas hot water type lithium bromide unit, a two-stage flue gas hot water plate and shell heat exchanger, a three-way valve and a temperature controller, and a chimney. The flue gas hot water type lithium bromide unit is connected to the flue through the three-way valve to utilize the high-temperature flue gas for cooling or heating, and to generate medium-temperature flue gas. The medium-temperature flue gas is mixed with the high-temperature flue gas through a three-way valve, and after being regulated to a preset temperature by a temperature controller, it is delivered to the two-stage flue gas hot water plate heat exchanger. The two-stage flue gas hot water plate heat exchanger uses the received flue gas to generate electricity and discharges the generated low-temperature flue gas through a chimney. The two-stage flue gas hot water plate heat exchanger is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit, respectively, and is used to transport the high-temperature intermediate water generated by the first stage heat exchange to the organic Rankine cycle power generation unit to provide heat energy for power generation, and to transport the low-temperature intermediate water generated by the second stage heat exchange to the low-temperature waste heat recovery unit to provide the first low-temperature heat source.

[0011] Optionally, the flue gas hot water type lithium bromide unit is connected to a high-temperature heat dissipation system to recover the heat carried by the high-temperature cooling water and use it for heating; The flue gas hot water type lithium bromide unit is connected to the intermediate cooling water heat exchanger of the low-temperature heat dissipation system via valves a and d, and is used to generate heat using the third low-temperature heat source carried by the low-temperature cooling water.

[0012] Optionally, the organic Rankine cycle power generation unit includes an organic Rankine cycle generator set, a circulating water pump, valve f, and valve g; The organic Rankine cycle generator set uses high-temperature intermediate water generated by a two-stage flue gas hot water plate and shell heat exchanger to generate electricity. The high-temperature intermediate water is then returned to the two-stage flue gas hot water plate and shell heat exchanger by a circulating water pump to complete the circulation of the high-temperature intermediate water. The organic Rankine cycle generator set transmits heat source water heated by the condensation waste heat generated by the organic Rankine power generation as the second low-temperature heat source to the low-temperature waste heat recovery unit via valve f, and recovers the heat source water to the organic Rankine cycle generator set via valve h.

[0013] Optionally, the low-temperature waste heat recovery unit includes a dual-heat-source parallel vapor compression heat pump unit, a second circulating water pump, a third circulating water pump, a fourth circulating water pump, and a heat user or heat storage device. The dual-heat-source parallel vapor compression heat pump unit is connected to the two-stage flue gas hot water plate and shell heat exchanger via a second circulating water pump. This is used to transport the first low-temperature heat source after releasing heat to the two-stage flue gas hot water plate and shell heat exchanger to realize the circulation of the first low-temperature heat source. The dual-heat-source parallel vapor compression heat pump unit receives the second heat source and the third heat source via valve b, and then, after releasing heat, the second heat source and the third heat source are respectively transported to the organic Rankine cycle generator unit and the intermediate cooling water heat exchanger via circulating water pump three and valve g, so as to realize the circulation of the second heat source and the third heat source. The dual-heat-source parallel vapor compression heat pump unit is connected to the heat user or heat storage device to deliver the generated high-temperature hot water to the heat user or heat storage device to provide heat energy, and receives the low-temperature return water from the heat user or heat storage device through the circulating water pump.

[0014] According to a second aspect of this application, a control method for an integrated internal combustion engine combined cooling, heating and power system is provided, comprising: Control the operation of the internal combustion engine to generate electricity, and simultaneously recover the high-temperature flue gas, high-temperature cooling water and low-temperature cooling water carried by it; Obtain user-side cooling, heating, and electrical load requirements, as well as ambient temperature parameters; Based on the load demand and ambient temperature parameters, the target operating mode of the system is determined, and the system is controlled to switch to the corresponding operating mode. In the operating mode, the distribution and cascade utilization process of the high-temperature flue gas is controlled so that it can be used to drive the flue gas hot water type lithium bromide unit for cooling or heating, and to generate a medium-temperature power generation heat source and provide a first low-temperature heat source for the two-stage flue gas hot water plate heat exchanger. The organic Rankine cycle power generation process is controlled, and the medium-temperature heat source is used to generate electricity, while a second low-temperature heat source is generated simultaneously. The first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source are combined. The first low-temperature heat source enters the evaporator of the dual-heat-source parallel vapor compression heat pump unit for heating. The second low-temperature heat source and the third low-temperature heat source are combined into one low-temperature heat source and enter the evaporator of the dual-heat-source parallel vapor compression heat pump unit and / or the flue gas hot water lithium bromide unit for heating.

[0015] Optionally, the operating mode includes at least one of the following: maximum cooling mode in summer, maximum heating mode in winter, flexible operating mode in transition season, and maximum power generation mode during periods of isolated grid or high electricity price. Determining the target operating mode of the system includes selecting a matching mode from a variety of predefined operating modes based on the priority relationship among the electrical load demand, cooling load demand, and heating load demand, as well as the ambient temperature parameter.

[0016] Through this application, by setting up an internal combustion engine power generation and multi-grade waste heat generation unit, a flue gas waste heat cascade utilization unit, an organic Rankine cycle power generation unit, and a low-temperature waste heat recovery unit and establishing corresponding connections, the flue gas waste heat cascade utilization unit can perform cascade distribution of high-temperature flue gas to achieve multiple uses, including driving cooling / heating, providing a medium-temperature power generation heat source for organic Rankine cycle power generation, and providing a first low-temperature heat source. The organic Rankine cycle power generation unit can utilize the medium-temperature power generation heat source to generate additional power and produce a second low-temperature heat source. The low-temperature waste heat recovery unit can collect the first low-temperature heat source generated by the flue gas cascade utilization and the ORC power generation unit. This technology utilizes a second low-temperature heat source and a third low-temperature heat source from the internal combustion engine, and improves their thermal energy grade to output high-temperature hot water. Therefore, it can solve the problems in related technologies where a large amount of low-temperature waste heat is wasted because the multi-grade waste heat generated by the internal combustion engine is not utilized in a full-spectrum cascade manner, high-temperature flue gas is not rationally allocated and utilized, additional power generation is not achieved through medium-temperature waste heat, and various low-temperature waste heats are not collected and their thermal energy grade is not improved for utilization. This achieves the technical effect of realizing the full-spectrum cascade utilization of multi-grade waste heat from the internal combustion engine, improving the overall power generation capacity of the system, fully recovering and utilizing various low-temperature waste heats, and improving the overall energy utilization rate of the system.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this application, nor is it intended to limit the scope of this application. Other features of this application will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic diagram of a terminal-integrated combined cooling, heating and power system for an internal combustion engine provided in an embodiment of this application; Figure 2 A schematic diagram of another integrated terminal-based combined cooling, heating and power system for an internal combustion engine provided in an embodiment of this application; Figure 3 This is a flowchart illustrating a control method for an integrated internal combustion engine combined cooling, heating and power system provided in an embodiment of this application.

[0020] In the diagram: 1. Internal combustion generator set; 2. Flue gas hot water type lithium bromide generator set; 3. Two-stage flue gas hot water plate heat exchanger; 4. Temperature controller three; 5. Organic Rankine cycle generator set; 6. Lubricating oil cooler; 7. Cylinder liner water heat exchanger; 8. Cylinder liner water pump; 9. Temperature controller one; 10. Intercooled water heat exchanger; 11. Intercooled water circulating pump; 12. Temperature controller two; 13. Dual heat source parallel vapor compression type heat pump unit; 14. Heat user or heat storage device; 15. Chimney; 16. Flue; 17. Circulating water pump one; 18. Circulating water pump two; 19. Circulating water pump three; 20. Circulating water pump four; a. Valve a; b. Valve b; c. Valve c; d. Valve d; e. Valve e; f. Valve f; g. Valve g; h. Valve h; M1. Three-way valve one; M2. Three-way valve two; M3. Three-way valve three. Detailed Implementation

[0021] The following description, in conjunction with the accompanying drawings, illustrates exemplary embodiments of this application, including various details to aid understanding. These should be considered merely exemplary. Therefore, those skilled in the art will recognize that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Similarly, for clarity and brevity, descriptions of well-known functions and structures are omitted in the following description.

[0022] The following description, with reference to the accompanying drawings, describes an embodiment of an integrated internal combustion engine combined cooling, heating and power system and its control method.

[0023] Figure 1 This is a schematic diagram of the structure of an integrated internal combustion engine combined cooling, heating and power system provided in an embodiment of this application, as shown below. Figure 1 As shown, the system includes: an internal combustion engine power generation and multi-grade waste heat generation unit, a flue gas waste heat cascade utilization unit, an organic Rankine cycle power generation unit, and a low-temperature waste heat recovery unit. The internal combustion engine power generation and multi-grade waste heat generation unit is connected to the flue gas waste heat cascade utilization unit and the low temperature waste heat recovery unit respectively, and is used to generate power and generate multi-grade waste heat including high temperature flue gas, high temperature cooling water and low temperature cooling water. The waste heat recovery unit is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit, respectively, and is used to receive the high-temperature flue gas and distribute the high-temperature flue gas to drive cooling or heating, provide a medium-temperature power generation heat source for organic Rankine cycle power generation and provide a first low-temperature heat source. The organic Rankine cycle power generation unit is connected to the low-temperature waste heat recovery unit, and is used to generate electricity using the medium-temperature power generation heat source and generate a second low-temperature heat source. The low-temperature waste heat recovery unit is used to receive the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source carried by the low-temperature cooling water, and to improve the heat energy quality of the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source to output high-temperature hot water.

[0024] In this embodiment, the integrated internal combustion engine combined cooling, heating and power system includes an internal combustion engine power generation and multi-grade waste heat generation unit, a flue gas waste heat cascade utilization unit, an organic Rankine cycle power generation unit, and a low-temperature waste heat recovery unit. Each unit establishes a corresponding connection relationship according to the system's energy cascade utilization needs, forming a complete combined cooling, heating and power energy utilization architecture.

[0025] The internal combustion engine power generation and multi-grade waste heat generation unit is centered on the internal combustion generator set. While completing the basic power output through the internal combustion generator set, this unit generates multi-grade waste heat resources, specifically including high-temperature flue gas of 400-550°C, high-temperature cooling water of 90 / 77°C composed of cylinder liner cooling water and lubricating oil cooling water, and low-temperature cooling water of 40 / 30°C composed of intercooler cooling water. This unit is connected to the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit, respectively, to transport the high-temperature flue gas to the flue gas waste heat cascade utilization unit and at the same time to transport the low-temperature cooling water to the low-temperature waste heat recovery unit.

[0026] After receiving high-temperature flue gas from the internal combustion engine power generation and multi-grade waste heat generation units, the flue gas waste heat cascade utilization unit performs cascade distribution and utilization of the high-temperature flue gas. A portion of the high-temperature flue gas is used to drive the flue gas hot water type lithium bromide unit to complete cooling or heating operations. The flue gas after heat release is mixed with the remaining high-temperature flue gas and transported to the two-stage flue gas-hot water plate heat exchanger. The first stage heat exchange generates medium-temperature heat source water that meets the needs of organic Rankine cycle power generation, and the second stage heat exchange generates the first low-temperature heat source. This unit is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit respectively to complete the directional transportation of the medium-temperature power generation heat source and the first low-temperature heat source.

[0027] The organic Rankine cycle power generation unit takes the organic Rankine cycle generator set as its core. After receiving the medium-temperature power generation heat source from the flue gas waste heat cascade utilization unit, it converts the medium-temperature waste heat into electrical energy to achieve additional power output. The condensed waste heat generated by this unit during the power generation process serves as a second low-temperature heat source, which is connected to the low-temperature waste heat recovery unit to complete the transmission of the second low-temperature heat source.

[0028] The low-temperature waste heat recovery unit takes a dual-heat-source parallel steam compression heat pump unit as its core, and centrally receives the first low-temperature heat source from the flue gas waste heat cascade utilization unit, the second low-temperature heat source from the organic Rankine cycle power generation unit, and the third low-temperature heat source carried by the low-temperature cooling water from the internal combustion engine power generation and multi-grade waste heat generation unit. The three types of low-temperature heat sources are processed through a heat energy grade improvement process, and finally output high-temperature hot water that can meet the heating and domestic use of users.

[0029] This system achieves full-spectrum cascade utilization of multi-grade waste heat from internal combustion engines through the coordinated operation of its various units, fully recovering the low-temperature waste heat that was discarded in traditional technologies. At the same time, it increases the system's power output by utilizing organic Rankine cycle power generation units, effectively improving the system's overall energy utilization efficiency.

[0030] This application connects the internal combustion engine power generation and multi-grade waste heat generation unit to the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit, respectively, for power generation and generating multi-grade waste heat including high-temperature flue gas, high-temperature cooling water, and low-temperature cooling water; the flue gas waste heat cascade utilization unit is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit, respectively, for receiving the high-temperature flue gas and distributing the high-temperature flue gas for driving refrigeration / heating, providing a medium-temperature power generation heat source for organic Rankine cycle power generation, and providing a first low-temperature heat source; the organic Rankine cycle power generation unit is connected to the low-temperature waste heat recovery unit, for generating electricity using the medium-temperature power generation heat source and generating a second low-temperature heat source; the low-temperature waste heat recovery unit is used to receive the first low-temperature heat source, the second low-temperature heat source, and a third low-temperature heat source carried by the low-temperature cooling water, and to increase the heat energy grade of the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source to output high-temperature hot water. Therefore, this technology can solve the problems in related technologies where a large amount of low-temperature waste heat is wasted because the multi-grade waste heat generated by internal combustion engines is not utilized in a full-spectrum cascade manner, high-temperature flue gas is not rationally allocated and utilized, additional power generation is not achieved through medium-temperature waste heat, and various low-temperature waste heats are not collected and their thermal energy grade is not improved for utilization. This achieves the technical effect of realizing the full-spectrum cascade utilization of multi-grade waste heat from internal combustion engines, improving the overall power generation capacity of the system, fully recovering and utilizing various low-temperature waste heats, and improving the overall energy utilization rate of the system.

[0031] Figure 2 This application further demonstrates an integrated terminal-based combined cooling, heating, and power system for internal combustion engines, as provided in an embodiment of this application. Figure 2 As shown: In this embodiment of the application, the internal combustion engine power generation and multi-grade waste heat generation unit includes an internal combustion generator set (1), a high-temperature heat dissipation module, and a low-temperature heat dissipation module; The internal combustion generator set (1) is connected to the flue gas waste heat cascade utilization unit through the flue (16) to transport the high-temperature flue gas generated by the internal combustion generator set (1) to the flue gas waste heat cascade utilization unit for subsequent cascade heat exchange and energy recovery. The high-temperature heat dissipation module is connected to the cooling system of the internal combustion generator set (1) and is used to recover the heat carried by the high-temperature cooling water and transport the recovered heat to the flue gas waste heat cascade utilization unit. The low-temperature heat dissipation module is connected to the cooling system of the internal combustion generator set (1) and is used to recover the heat carried by the low-temperature cooling water and to transport the recovered heat as the third low-temperature heat source to the low-temperature waste heat recovery unit and / or the flue gas waste heat cascade utilization unit.

[0032] In this embodiment, the internal combustion engine power generation and multi-grade waste heat generation unit serves as the power and waste heat source of the entire combined cooling, heating and power system. It consists of an internal combustion generator set (1), a high-temperature heat dissipation module, and a low-temperature heat dissipation module. The three components work together to realize the classified recovery and directional transportation of power generation and multi-grade waste heat.

[0033] The internal combustion generator set (1) is the core working device of this unit. While burning fuel to convert mechanical energy into electrical energy and output basic power, it will continuously generate high-temperature flue gas of 400-550°C. This high-temperature flue gas is directly transported to the flue gas waste heat utilization unit through the flue (16) connected to the exhaust end of the internal combustion generator set (1). The flue (16) provides a closed transport channel for the high-temperature flue gas, which can effectively reduce the heat loss of the high-temperature flue gas during the transport process and ensure the efficiency of subsequent cascade heat exchange and energy recovery. The high-temperature heat dissipation module forms a closed connection with the cooling system of the internal combustion generator set (1). This module is specifically designed to recover heat from the high-temperature cooling water composed of cylinder liner cooling water and lubricating oil cooling water generated during the operation of the internal combustion generator set (1). After fully extracting the heat energy contained in the high-temperature cooling water through the heat exchange structure, the recovered heat is directionally transported to the flue gas waste heat utilization unit, and works with the high-temperature flue gas to provide thermal energy support for subsequent cooling and heating operations. The low-temperature heat dissipation module is also connected to the cooling system of the internal combustion generator set (1). It performs heat recovery work on the low-temperature cooling water composed of the intercooler cooling water of the internal combustion generator set (1). After the heat extraction of the low-temperature cooling water is completed, this part of the heat is used as the third low-temperature heat source of the system. According to the actual operating conditions and load requirements of the combined cooling, heating and power system, it is flexibly transported to the low-temperature waste heat recovery unit, or simultaneously transported to the low-temperature waste heat recovery unit and the flue gas waste heat cascade utilization unit, so as to realize the on-demand distribution and diversified utilization of the heat of the low-temperature cooling water, and the heat of the low-temperature cooling water that was originally regarded as waste heat is effectively recovered.

[0034] This unit enables the source-based classification, recovery, and targeted transport of multi-grade waste heat during internal combustion engine power generation, allowing high-temperature and low-temperature waste heat to be utilized differently according to their grade, thus improving the targeting of waste heat recovery. At the same time, the closed-loop cooling connection reduces heat loss, laying a good foundation for the cascade energy utilization of subsequent systems and effectively avoiding the waste of waste heat at the source.

[0035] In this embodiment, the high-temperature heat dissipation module includes a lubricating oil cooler (6) and a cylinder liner water heat exchanger (7) arranged in series, as well as a cylinder liner water pump (8), a temperature controller (9), and a three-way valve (M1). The primary side of the lubricating oil cooler (6) and the cylinder liner water heat exchanger (7) are respectively connected to the lubricating oil cooling circuit and the cylinder liner water cooling circuit of the internal combustion generator set (1) to receive and cool the high-temperature lubricating oil and cylinder liner water. The secondary side of the lubricating oil cooler (6) and the cylinder liner water heat exchanger (7) are connected in series to form an intermediate water circulation loop, which is used to absorb heat from the primary side and be heated. The temperature controller (9) and the three-way valve (M1) are used to adjust the flow rate of the intermediate water circulation circuit to stabilize the return water temperature of the lubricating oil cooling circuit and the cylinder liner water cooling circuit.

[0036] In this embodiment, the high-temperature heat dissipation module is the core structure for recovering heat from high-temperature cooling water in the internal combustion engine power generation and multi-grade waste heat generation unit. The whole module consists of a lubricating oil cooler (6), a cylinder liner water heat exchanger (7), a cylinder liner water pump (8), a temperature controller (9), and a three-way valve (M1). The lubricating oil cooler (6) and the cylinder liner water heat exchanger (7) are arranged in series to form a compact and efficient heat exchange component.

[0037] The primary side of the lubricating oil cooler (6) is connected to the lubricating oil cooling circuit of the internal combustion generator set (1). It is specifically designed to receive high-temperature lubricating oil at 74°C and cool it down to 62°C before sending the lubricating oil back to the internal combustion generator set (1). The primary side of the cylinder liner water heat exchanger (7) is connected to the cylinder liner water cooling circuit of the internal combustion generator set (1). It receives high-temperature cylinder liner water at 95°C to complete the cooling operation. After cooling it down to 82°C, it flows back to the internal combustion generator set (1). The two heat exchangers respectively complete the cooling of the corresponding high-temperature medium, ensuring the normal operation of the internal combustion generator set (1).

[0038] The secondary sides of the lubricating oil cooler (6) and the cylinder liner water heat exchanger (7) are connected in series to form a closed intermediate water circulation loop. The cylinder liner water pump (8) provides continuous power for the intermediate water circulation in this loop. The intermediate water at 77°C flows through the lubricating oil cooler (6) and the cylinder liner water heat exchanger (7) in sequence in the loop, fully absorbing the heat carried by the high-temperature lubricating oil and cylinder liner water on the primary side. After the heat energy extraction is completed, the temperature of the intermediate water can rise to 90°C.

[0039] Temperature controller 1 (9) and three-way valve 1 (M1) form an interlocked control structure. Temperature controller 1 (9) sets the preset return water temperature at 77°C and adjusts the opening of both sides of three-way valve 1 (M1) according to the actual temperature data detected, thereby changing the medium flow rate in the intermediate water circulation loop, accurately controlling the heat exchange intensity, and finally stabilizing the return water temperature of the lubricating oil cooling loop and cylinder liner water cooling loop at about 77°C.

[0040] This high-temperature heat dissipation module enables efficient and centralized recovery of high-temperature lubricating oil and cylinder liner water heat from the internal combustion generator set. The series-connected heat exchange structure improves the waste heat absorption efficiency. At the same time, through the synergistic effect of temperature control and flow regulation components, the return water temperature of the internal combustion engine cooling circuit is stabilized, which not only ensures the operational safety and efficiency of the internal combustion generator set, but also allows the recovered high-temperature waste heat to be stably delivered to subsequent units for utilization.

[0041] In this embodiment, the low-temperature heat dissipation module includes a medium-cooled water heat exchanger (10), a medium-cooled water circulating pump (11), a second temperature controller (12), a second three-way valve (M2), valve c (c), and valve e (e). The primary side of the intermediate cooling water heat exchanger (10) includes the intermediate cooling water circulating pump (11), the three-way valve (M2), the intermediate cooling water heat exchanger (10), and the temperature controller (12) connected in sequence. The primary side of the intercooled water heat exchanger (10) is connected to the cooling circuit of the pressurized air intercooler of the internal combustion generator set (1) for receiving and cooling intercooled water. The temperature controller 2 (12) and the three-way valve 2 (M2) are used to regulate the flow rate on the primary side of the intercooled water heat exchanger (10) to stabilize the return water temperature of the cooling circuit of the pressurized air intercooler. The intermediate cooling water heat exchanger (10) is connected to the flue gas waste heat cascade utilization unit and the low temperature waste heat recovery unit through valve c (c) to provide the third low temperature heat source, and is connected to the flue gas waste heat cascade utilization unit and the low temperature waste heat recovery unit through valve e (e) to recover the utilized third low temperature heat source.

[0042] In this embodiment, the low-temperature heat dissipation module is the core structure for recovering low-temperature cooling water heat in the internal combustion engine power generation and multi-grade waste heat generation unit. It consists of a medium-cooled water heat exchanger (10), a medium-cooled water circulation pump (11), a second temperature controller (12), and a second three-way valve (M2). Each component forms an orderly connection structure according to its function to realize the cooling of medium-cooled water and the recovery and transportation of low-temperature waste heat.

[0043] The primary side of the intercooled water heat exchanger (10) forms a closed loop. The intercooled water circulation pump (11), three-way valve (M2), intercooled water heat exchanger (10) and temperature controller (12) are connected in sequence along the direction of medium flow. The entire loop is connected to the cooling loop of the intercooler of the boosted air of the internal combustion generator set (1). It is specifically designed to receive the 51°C intercooled water in the loop and complete the cooling operation. After the intercooled water is cooled to 47°C, it flows back to the cooling loop of the intercooler of the boosted air of the internal combustion generator set (1) to ensure the cooling effect of the boosted air of the internal combustion generator set (1) and maintain the normal operation of the unit.

[0044] Temperature controller 2 (12) and three-way valve 2 (M2) form an interlocking adjustment structure. Temperature controller 2 (12) detects the return water temperature of the primary side of the intercooled water heat exchanger (10) in real time, and adjusts the opening of three-way valve 2 (M2) according to the detection data, thereby flexibly changing the flow rate of the intercooled water on the primary side, accurately controlling the heat exchange intensity, and finally stabilizing the return water temperature of the cooling circuit of the pressurized air intercooler at about 47°C.

[0045] After the intermediate cooling water heat exchanger (10) completes the extraction of low-temperature waste heat through heat exchange, it uses valve c (c) to build a conveying channel with the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit. The extracted low-temperature waste heat is used as the third low-temperature heat source and is transported to the corresponding unit as needed. At the same time, a recovery channel is built through valve e (e) to recover the third low-temperature heat source after it has been used by the two units, so that the low-temperature medium returns to the intermediate cooling water heat exchanger (10) to participate in the heat exchange cycle and realize the recycling of the low-temperature medium.

[0046] It achieves efficient cooling of the cooling water in the cooling circuit of the turbocharged air intercooler of the internal combustion generator set and precise extraction of low-temperature waste heat. The interlocked flow regulation structure stabilizes the return water temperature, ensuring the operating efficiency and safety of the internal combustion generator set. The valve enables flexible delivery and recovery of the third low-temperature heat source, allowing the low-temperature waste heat to be distributed to different units as needed. At the same time, it realizes the recycling of the low-temperature medium, greatly improving the recovery and utilization rate of low-temperature cooling water waste heat and avoiding the direct waste of low-temperature waste heat.

[0047] In this embodiment, the waste heat utilization unit includes a flue (16), a flue gas hot water type lithium bromide unit (2), a two-stage flue gas hot water plate heat exchanger (3), a three-way valve (M3) and a temperature controller (4), and a chimney (15). The flue gas hot water type lithium bromide unit (2) is connected to the flue (16) through the three-way valve (M3) to utilize the high-temperature flue gas for cooling and to generate medium-temperature flue gas; The medium-temperature flue gas is mixed with the high-temperature flue gas through the three-way valve (M3), and after being regulated to the preset temperature by the temperature controller (4), it is delivered to the two-stage flue gas hot water plate heat exchanger (3). The two-stage flue gas hot water plate heat exchanger (3) generates electricity using the received flue gas and discharges the generated low-temperature flue gas through the chimney (15); The dual-stage flue gas hot water plate heat exchanger (3) is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit respectively, and is used to transport the high-temperature intermediate water generated by the first stage heat exchange to the organic Rankine cycle power generation unit to provide power generation heat energy, and to transport the low-temperature intermediate water generated by the second stage heat exchange to the low-temperature waste heat recovery unit to provide the first low-temperature heat source.

[0048] In this embodiment, the flue gas waste heat cascade utilization unit is the core unit of the system to realize the cascade recovery and multi-purpose utilization of high-temperature flue gas. It consists of a flue (16), a flue gas hot water type lithium bromide unit (2), a two-stage flue gas hot water plate heat exchanger (3), a three-way valve (M3), a temperature controller (4), and a chimney (15). Each component is connected in an orderly manner according to the flue gas flow and heat exchange requirements to realize the diversion utilization, temperature control and cascade heat exchange of high-temperature flue gas.

[0049] The flue (16) serves as a flue gas transport channel, transporting the high-temperature flue gas of 400-550°C generated by the internal combustion generator set (1) to the three-way valve (M3). The three-way valve (M3) realizes the distribution of the high-temperature flue gas. A portion of the high-temperature flue gas is transported to the flue gas hot water type lithium bromide generator set (2). This unit uses the heat energy of the high-temperature flue gas to complete the cooling / heating operation, meeting the user's cooling / heating load requirements. After heat exchange, the high-temperature flue gas is cooled to 120°C medium-temperature flue gas and flows back to the three-way valve (M3).

[0050] The medium-temperature flue gas that returns is fully mixed with the high-temperature flue gas that does not enter the unit in the three-way valve (M3). The temperature controller (4) performs real-time temperature detection and regulation on the mixed flue gas. After the flue gas temperature is accurately controlled to a preset temperature of not less than 225℃, it is sent to the two-stage flue gas hot water plate heat exchanger (3) for deep cascade heat exchange.

[0051] The two-stage flue gas hot water plate heat exchanger (3) performs two-stage heat exchange on the received flue gas. At the same time, the low-temperature flue gas, which has been cooled to below the dew point temperature (≤30℃) after continuous heat exchange, is discharged into the outside through the chimney (15), thus completing the full-process heat exchange utilization of the flue gas. The heat exchanger also establishes a medium transport connection with the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit respectively. The 150℃ high-temperature intermediate water generated by the first stage heat exchange is directionally transported to the organic Rankine cycle power generation unit to provide it with core power generation heat energy. At the same time, the 25℃ low-temperature intermediate water generated by the second stage heat exchange is transported to the low-temperature waste heat recovery unit as the first low-temperature heat source of the system to support the subsequent waste heat utilization.

[0052] This unit realizes multi-grade cascade utilization of high-temperature flue gas. By controlling the flow and mixing, the flue gas heat energy is matched with different utilization needs. The synergistic effect of the temperature controller and the three-way valve ensures the temperature stability of the heat exchange flue gas, providing reliable conditions for subsequent heat exchange and power generation. The two-stage heat exchange structure fully extracts the heat energy of the flue gas, providing a heat source for the power generation unit and supplementing the low-temperature waste heat recovery unit with a low-temperature heat source, which greatly improves the recovery and utilization rate of flue gas waste heat and reduces the direct loss of flue gas heat energy.

[0053] In this embodiment of the application, the flue gas hot water type lithium bromide unit (2) is connected to a high-temperature heat dissipation system for recovering the heat carried by the high-temperature cooling water and using it for heating or cooling. The flue gas hot water type lithium bromide unit (2) is connected to the intermediate cooling water heat exchanger (10) of the low temperature heat dissipation system via valve a (a) and valve d (d) for heating using the third low temperature heat source carried by the low temperature cooling water.

[0054] In this embodiment, the flue gas hot water type lithium bromide unit (2) is the core device for realizing the preparation of cold and hot energy in the system. It can be connected to both the high temperature heat dissipation system and the low temperature heat dissipation system at the same time, so as to realize the recovery and utilization of the waste heat of cooling water of different grades, thereby improving its own heating flexibility and energy efficiency.

[0055] The unit establishes a stable heat transfer connection with the high-temperature heat dissipation system, and receives the intermediate water that has been heated to 90°C after heat exchange with the lubricating oil cooler (6) and cylinder liner water heat exchanger (7) in the high-temperature heat dissipation system. It fully recovers the heat carried by the high-temperature cooling water. This part of the high-temperature waste heat will work together with the high-temperature flue gas transported by the internal combustion generator set (1) to become the core heat source for the flue gas hot water type lithium bromide generator set (2) to meet the basic cold and heat preparation requirements of the unit. After heat exchange, the temperature of the intermediate water drops back to 77°C and returns to the high-temperature heat dissipation system to participate in the circulating heat exchange.

[0056] Meanwhile, the flue gas hot water type lithium bromide unit (2) establishes a medium transport channel with the cold water heat exchanger (10) in the low temperature heat dissipation system through valves a (a) and d (d). The third low temperature heat source carried by the low temperature cooling water extracted by the intermediate cold water heat exchanger (10) will be transported to the flue gas hot water type lithium bromide unit (2) in the form of 40°C intermediate water through valve a (a) to supplement the low temperature heat source for the unit's heating. After being used by the unit, the temperature of the low temperature intermediate water drops to 30°C and then flows back to the intermediate cold water heat exchanger (10) through valve d (d) to continue participating in the heat exchange cycle.

[0057] The flue gas hot water type lithium bromide unit (2) can flexibly choose to use the waste heat of high temperature cooling water in conjunction with high temperature flue gas to drive refrigeration, or at the same time use the third low temperature heat source of low temperature cooling water to complete the heating operation, so as to realize the on-demand allocation and utilization of waste heat of different grades.

[0058] The flue gas hot water type lithium bromide unit (2) realizes efficient recovery and utilization of waste heat from high-temperature cooling water. At the same time, it expands the utilization path of the third low-temperature heat source of low-temperature cooling water by means of valve passage, allowing the unit to complete cooling or heating by relying on multi-grade waste heat. The adaptation and utilization of multiple heat sources improves the energy efficiency and operating condition adaptability of the unit's cooling and heating preparation, fully explores the utilization value of waste heat from cooling water, reduces waste heat, and further improves the overall energy recovery and utilization efficiency of the system.

[0059] In this embodiment of the application, the organic Rankine cycle power generation unit includes an organic Rankine cycle generator set (5), a circulating water pump (17), valve f (f), and valve h (h). The organic Rankine cycle generator set (5) uses the high-temperature intermediate water generated by the two-stage flue gas hot water plate heat exchanger (3) to generate electricity. The high-temperature intermediate water after use is returned to the two-stage flue gas hot water plate heat exchanger (3) by the circulating water pump (17) to complete the circulation of the high-temperature intermediate water. The organic Rankine cycle generator set (5) transmits the heat source water heated by the condensation waste heat generated by the organic Rankine power generation as the second low temperature heat source to the low temperature waste heat recovery unit via valve f (f), and recovers the heat source water to the organic Rankine cycle generator set (5) via valve h (h).

[0060] In this embodiment, the organic Rankine cycle power generation unit is the core unit of the system to realize medium-temperature waste heat power generation and improve the overall power generation output. It consists of an organic Rankine cycle generator set (5), a circulating water pump (17), valve f (f), and valve h (h). Each component forms an orderly connection structure around the medium-temperature waste heat power generation and medium circulation to realize the efficient conversion of medium-temperature thermal energy into electrical energy.

[0061] The organic Rankine cycle generator set (5) of this unit is connected to the two-stage flue gas hot water plate heat exchanger (3), and receives the 150°C high-temperature intermediate water generated by the first stage heat exchange of the heat exchanger. This water is used as the core power generation heat source to drive the organic working fluid in the unit to expand and do work, complete the conversion of intermediate temperature waste heat into electrical energy, and realize the additional power output of the system.

[0062] After the high-temperature intermediate water completes the heat release, the temperature drops to 120°C. The circulating water pump (17) provides circulation power for this cooled intermediate water and stably transports it back to the two-stage flue gas hot water plate heat exchanger (3) to re-participate in heat exchange and heating, forming a closed high-temperature intermediate water circulation loop, realizing the recycling of the medium-temperature heat exchange medium and avoiding medium loss.

[0063] During the power generation process, the organic Rankine cycle generator set (5) generates condensation waste heat, which heats the supporting heat source water to form 40°C heat source water and serves as the second low-temperature heat source of the system. The unit establishes a conveying channel with the low-temperature waste heat recovery unit through valve f (f), and directs this part of the second low-temperature heat source to the low-temperature waste heat recovery unit for subsequent heat energy grade improvement. The heat source water that is cooled to 30°C after being used by the low-temperature waste heat recovery unit flows back to the organic Rankine cycle generator set (5) through the recovery channel formed by valve h (h), and absorbs the condensation waste heat of the unit again to complete the recycling of heat source water.

[0064] In this embodiment of the application, the low-temperature waste heat recovery unit includes a dual heat source parallel vapor compression heat pump unit (13), valve b (b), valve g (g), circulating water pump two (18), circulating water pump three (19), circulating water pump four (20), and heat user or heat storage device (14). The dual-heat-source parallel vapor compression heat pump unit (13) is connected to the dual-stage flue gas hot water plate and shell heat exchanger (3) via circulating water pump two (18) to deliver the first low-temperature heat source after releasing heat to the dual-stage flue gas hot water plate and shell heat exchanger (3) so as to realize the circulation of the first low-temperature heat source. The dual-heat-source parallel vapor compression heat pump unit (13) receives the second low-temperature heat source and the third low-temperature heat source through the valve b (b), and after releasing heat, the second low-temperature heat source and the third low-temperature heat source are respectively transported to the organic Rankine cycle generator unit (5) and the intermediate cooling water heat exchanger (10) through the circulating water pump three (19) and the valve g (g) to realize the circulation of the second low-temperature heat source and the third low-temperature heat source; The dual-heat-source parallel vapor compression heat pump unit (13) is connected to the heat user or heat storage device (14) to deliver the generated high-temperature hot water to the heat user or heat storage device (14) to provide heat energy, and to receive the low-temperature return water returned by the heat user or heat storage device (14) through the circulating water pump four (20).

[0065] In this embodiment, the low-temperature waste heat recovery unit is the core unit of the system to realize the centralized recovery, quality improvement and recycling of various low-temperature waste heat. It consists of a dual-heat-source parallel vapor compression heat pump unit (13), circulating water pump two (18), circulating water pump three (19), circulating water pump four (20) and heat users or heat storage devices (14). Each component forms a complete working structure around the absorption of low-temperature waste heat, heat energy improvement, heat energy transmission and medium circulation. The dual-heat-source parallel vapor compression heat pump unit (13) is the core device and plays a key role in improving the quality of low-temperature waste heat.

[0066] The unit is connected to the two-stage flue gas hot water plate heat exchanger (3) through pipelines, and receives the first low temperature heat source of 25°C delivered by it. After the heat absorption is completed, the temperature of the first low temperature heat source drops to 20°C. The second circulating water pump (18) provides circulation power for this part of the low temperature medium and stably transports it back to the two-stage flue gas hot water plate heat exchanger (3) to re-participate in heat exchange and temperature rise, so as to realize the closed circulation of the heat exchange medium of the first low temperature heat source.

[0067] The dual-heat-source parallel vapor compression heat pump unit (13) establishes a medium receiving channel with the organic Rankine cycle generator unit (5) and the intermediate cooling water heat exchanger (10) through valve b (b), and centrally receives the second and third low-temperature heat sources at 40°C. After heat extraction is completed, the medium temperature of the two types of low-temperature heat sources drops to 30°C. The circulating water pump three (19) cooperates with valve g (g) to directionally transport the cooled medium and send it back to the organic Rankine cycle generator unit (5) and the intermediate cooling water heat exchanger (10) respectively, so as to realize the recycling of the heat exchange medium of the second and third low-temperature heat sources.

[0068] The dual-heat-source parallel steam compression heat pump unit (13) improves the heat energy quality of the three types of low-temperature waste heat it absorbs, generates high-temperature hot water at 60°C and delivers it to the heat user or heat storage device (14) to provide users with heat energy support such as heating and domestic heat. The circulating water pump four (20) recovers the low-temperature return water after the heat user or heat storage device (14) has completed the heat energy release and returns it to the unit to continuously ensure the heat energy transmission and medium circulation on the user side.

[0069] This unit achieves centralized recovery and efficient heat energy quality enhancement of the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature waste heat within the system, making full use of the low-temperature waste heat that is discarded in traditional technologies. Through the cooperation of multiple circulating water pumps and corresponding valves, a closed-loop circulation of heat exchange media for various low-temperature heat sources is realized, avoiding media loss and heat loss. At the same time, it provides stable high-temperature hot water for heat users or heat storage devices, realizing the resource utilization of low-temperature waste heat, significantly reducing the system's waste heat emissions, and further improving the system's overall energy utilization rate.

[0070] Accordingly, embodiments of this application provide a control method for a terminal-integrated internal combustion engine combined cooling, heating and power system, such as... Figure 3 As shown, the method includes: Step 101: Control the internal combustion engine to generate electricity, and simultaneously recover the high-temperature flue gas, high-temperature cooling water and low-temperature cooling water carrying multiple grades of waste heat.

[0071] In some embodiments, the internal combustion generator set (1) is started and controlled to operate stably according to the system's preset operating parameters. The internal combustion generator set (1) converts chemical energy into mechanical energy by burning natural gas, and then the mechanical energy is converted into electrical energy by the power generation device, continuously outputting electrical energy to bear the system's basic electrical load and meet the user's basic electricity demand. While the internal combustion generator set (1) is generating electricity, the system simultaneously carries out multi-grade waste heat recovery operations without generating a time lag in waste heat recovery, thus achieving coordinated power generation and waste heat recovery.

[0072] During operation, the internal combustion generator set (1) continuously generates three types of waste heat of different grades. The first is high-temperature flue gas of 400-550°C. This high-temperature flue gas enters the flue (16) directly from the exhaust end of the internal combustion generator set (1). The waste heat of the high-temperature flue gas is initially recovered and directionally transported through the closed conveying of the flue (16). The second is waste heat carried by high-temperature cooling water. The high-temperature cooling water consists of high-temperature lubricating oil of 74°C and cylinder liner water of 95°C. The two enter the corresponding lubricating oil cooler (6) and cylinder liner water heat exchanger (7) respectively. The waste heat of the high-temperature cooling water is quickly recovered through the heat exchange structure. The third is waste heat carried by low-temperature cooling water. The low-temperature cooling water is 51°C of pressurized air intercooler cooling water. This cooling water enters the intercooler water heat exchanger (10). The waste heat of the low-temperature cooling water is extracted and recovered through heat exchange. The above three types of multi-grade waste heat are collected simultaneously during the power generation process of the internal combustion generator set (1), and the full spectrum of waste heat capture is completed from the source of energy generation, without direct emission and loss of waste heat.

[0073] The simultaneous generation of power by the internal combustion generator set and the recovery of multi-grade waste heat complete the full spectrum collection of waste heat carried by high-temperature flue gas, high-temperature cooling water and low-temperature cooling water from the source of energy generation, avoiding the direct loss of waste heat during the power generation process, laying a complete waste heat resource foundation for the subsequent cascade utilization of multi-grade waste heat, and improving the starting efficiency of the system's energy recovery.

[0074] Step 102: Obtain the user's cooling, heating, and electrical load requirements and ambient temperature parameters.

[0075] In some embodiments, the system uses a load acquisition module and an environmental sensing and detection device to collect multi-dimensional data in real time, accurately obtaining the user's cooling, heating, and electrical load requirements as well as the ambient temperature parameters on site.

[0076] The user-side cooling load demand includes hourly load data for different cooling scenarios such as building space cooling and process cooling. The heating load demand covers real-time and time-specific load data for heating scenarios such as heating, domestic hot water, and process heat. The electricity load demand includes the power and time-specific electricity demand of various electrical equipment such as daily electricity consumption and industrial production electricity consumption on the user side. The above-mentioned cooling, heating, and electricity load data are all collected accurately by region and time period according to the actual energy consumption scenarios on the user side, ensuring the comprehensiveness and timeliness of the load demand data.

[0077] Meanwhile, the system continuously monitors and acquires real-time ambient temperature parameters through outdoor temperature sensors, and also combines this with time-specific ambient temperature trends to generate dynamic data feedback on ambient temperature. The system integrates and analyzes the collected cooling, heating, and electrical load demand data, and comprehensively calculates the actual energy demand on the user side based on the ambient temperature parameters. This clarifies the core and secondary energy demands of the user side during the current time period, providing complete and reliable data support for the intelligent switching of subsequent system operation modes and precise control of energy cascade utilization, ensuring a high degree of matching between the system's energy supply and the user's energy demand.

[0078] This step provides a precise and comprehensive data foundation for the intelligent control of the system. By collecting hourly data on the user's cooling, heating, and electrical load demands and monitoring ambient temperature parameters in real time, the system can accurately determine the user's core energy needs. This provides a basis for the rational switching of subsequent operating modes and the optimized allocation of energy, avoiding energy waste caused by the mismatch between energy supply and actual demand, and improving the economic efficiency and energy utilization efficiency of the system operation.

[0079] Step 103: Based on the load demand and ambient temperature parameters, determine the target operating mode of the system and control the system to switch to the corresponding operating mode.

[0080] In some embodiments, after accurately acquiring the user-side cooling, heating, and electricity load demands and on-site ambient temperature parameters, the system performs comprehensive calculations and analyses on all collected data through the supporting energy control module. Combined with preset operating mode matching rules, the system determines the target operating mode to be adapted to. The preset target operating modes include four typical types: maximum cooling mode in summer, maximum heating mode in winter, flexible operating mode in transition seasons, and maximum power generation mode during isolated grid or high electricity price periods.

[0081] During the mode matching process, if the ambient temperature is detected to be in the high-temperature range and the user-side cooling load demand is much higher than the heating load demand, the system will determine the target operating mode as the maximum cooling mode in summer; if the ambient temperature is in the low-temperature range and the user-side heating load demand is the core energy demand, the system will determine the target operating mode as the maximum heating mode in winter; if the ambient temperature is in the normal temperature transition range and the user-side cooling and heating loads are both partial demands, while the electricity load is the main demand, the system will determine the target operating mode as the flexible operating mode for the transition season; if the system is in an isolated grid operation state or during a high electricity price period, and the user-side electricity load demand has the highest priority and the cooling and heating loads are secondary demands, the system will determine the target operating mode as the maximum power generation mode during the isolated grid or high electricity price period.

[0082] After the target operating mode is determined, the energy control module will issue corresponding control commands to precisely adjust the on / off state and opening degree of three-way valves (M1, M2, M3, a, b, d, g) and three-way valves (M3) in the system. At the same time, it will control the detection and control parameters of temperature controllers (9, 12, 3) and temperature controllers (4) and switch the operating conditions of flue gas hot water type lithium bromide generator (2), organic Rankine cycle generator (5), and dual heat source parallel vapor compression heat pump unit (13) in a synchronous manner. This will achieve coordinated action of each component of the system, complete the smooth switch to the target operating mode, and ensure that the system operating state is highly compatible with the energy demand and ambient temperature of the user side.

[0083] In this embodiment, the operating mode includes at least one of the following: maximum cooling mode in summer, maximum heating mode in winter, flexible operating mode in transition season, and maximum power generation mode during isolated grid or high electricity price periods; Determining the target operating mode of the system includes selecting a matching mode from a variety of predefined operating modes based on the priority relationship among the electrical load demand, cooling load demand, and heating load demand, as well as the ambient temperature parameter.

[0084] When the system is in maximum summer cooling mode: While meeting the cooling load, the power generation and energy utilization efficiency are maximized. The internal combustion generator set (1) burns natural gas to generate electricity, undertakes the basic electrical load, and discharges high-temperature flue gas of 400-550℃. The thermostat on the flue (16) controls the opening of the three-way valve (M3) on the flue (16) to regulate and distribute the flow into the flue gas hot water type lithium bromide generator set (2) and the two-stage flue gas hot water plate heat exchanger (3), so as to adjust the flue gas entering the two-stage flue gas hot water plate heat exchanger (3) to ≥225℃, so as to ensure that the high-temperature intermediate water of the first stage heat exchanger is above 150℃, which meets the basic requirements of ORC power generation; ORC meets the basic operating conditions, uses the high-temperature intermediate water (150 / 120℃) generated by flue gas heat exchange to generate electricity, and increases the total power generation output of the system. Its condenser generates low-temperature waste heat (40℃); the flue gas hot water type lithium bromide generator set (2) serves as the main cold source, utilizing The high-temperature flue gas (400-550℃) and high-temperature cooling water (90 / 77℃) of the internal combustion engine drive the flue gas hot water type lithium bromide unit (2) for efficient cooling. The low-temperature cooling water (40 / 30℃) entering the flue gas hot water type lithium bromide unit (2) is closed (i.e., valves a (a) and d (d) are closed). The dual heat source heat pump operates as a low-temperature waste heat recovery device. The low-temperature heat source water generated by the condensation heat of the ORC low-temperature generator set and the low-temperature cooling water of the internal combustion engine are collected (40 / 30℃) and enter the evaporator of the dual heat source parallel vapor compression type heat pump unit (13) as its first low-temperature heat source. The low-temperature intermediate water (25 / 20℃) generated by the second stage heat exchange of the dual-stage flue gas hot water plate heat exchanger (3) enters the evaporator of the dual heat source parallel vapor compression type heat pump unit (13) as its second low-temperature heat source. The evaporator absorbs all low-temperature heat sources (low-temperature water from flue gas, ORC condensation waste heat and internal combustion engine intercooling waste heat), and the electric motor drives the compressor to work. The condenser produces 60 / 50℃ domestic hot water to supply heat users or heat storage devices (14).

[0085] In this mode, the system has a high “cooling-to-electricity ratio”. The core role of the flue gas hot water lithium bromide unit is to drive refrigeration with waste heat. All low-temperature waste heat is absorbed by the dual heat source parallel steam compression heat pump unit (13) to generate high-temperature hot water for heat users.

[0086] When the system is in maximum winter heating mode: To meet the building's heating and domestic hot water needs, while ensuring power supply and energy utilization efficiency. The internal combustion generator set (1) burns natural gas to generate electricity, undertakes the basic electrical load, and discharges high-temperature flue gas of 400-550℃. The thermostat on the flue (16) interlocks to control the opening of the three-way valve (M3) on the flue (16), and adjusts and distributes the flow into the flue gas hot water type lithium bromide generator set (2) and the two-stage flue gas hot water plate heat exchanger (3), so as to adjust the flue gas entering the two-stage flue gas hot water plate heat exchanger (3) to ≥225℃, so as to ensure that the intermediate water for the first stage heat exchange of the heat exchanger is above 150℃, which meets the basic requirements of ORC power generation; ORC meets the basic operating conditions, and uses the high-temperature intermediate water (150℃) generated by the ≥225℃ flue gas heat exchange. / 120℃) to generate electricity, increase the total power output of the system, and its condenser generates low-temperature waste heat (40℃); the flue gas hot water type lithium bromide unit (2) is converted into a heat pump working mode as the main heat source, and the high temperature flue gas and high temperature cooling water (90 / 77℃) of the internal combustion engine drive the flue gas hot water type lithium bromide unit (2), open the low temperature cooling water (40 / 30℃) pipeline valve entering the evaporator of the flue gas hot water type lithium bromide unit (2) (i.e., open valve a (a) and valve d (d)), and close the evaporator of the dual heat source parallel vapor compression type heat pump unit (13) as its first low temperature heat source pipeline valve (i.e., close valve b (b) and valve g (g)). The low-temperature heat source water generated by the condensation heat of the ORC low-temperature generator set and the low-temperature cooling water (40℃) of the internal combustion engine are collected and fed into the evaporator of the flue gas hot water type lithium bromide unit (2) as its low-temperature heat source to release heat. The heat generated by the absorber and condenser is used to heat the building to meet the heating needs. The dual heat source heat pump is switched to a single heat source heating mode as a low-temperature waste heat recovery device. The first low-temperature heat source valve is closed, and the low-temperature water (25 / 20℃) generated by the second stage heat exchange of the dual-stage flue gas hot water plate heat exchanger (3) enters the evaporator of the dual heat source parallel vapor compression type heat pump unit (13) as its single low-temperature heat source. The evaporator absorbs all its heat, the electric power drives the compressor to work, and the condenser generates 60 / 50℃ domestic hot water to supply heat users or heat storage devices (14).

[0087] In this mode, the system's "heat-to-power ratio" and total heat output capacity are maximized. The flue gas hot water lithium bromide unit is converted into a heat pump mode, absorbing low-temperature waste heat of 40 / 30℃ to achieve the function of heating. The dual-heat-source parallel steam compression heat pump unit (13) is converted into a single-heat-source heat pump mode, absorbing low-temperature waste heat of 25 / 20℃ to achieve heating and generate high-temperature hot water for heat users.

[0088] When the system is in the flexible operation mode during the transition season: The system balances potentially simultaneous cooling and heating loads while efficiently supplying power. It is flexible, allocating power on demand to meet specific needs. The internal combustion engine adjusts its operation based on the electrical load, and the waste heat changes accordingly. The flue gas hot water type lithium bromide system adjusts to cooling mode as needed, prioritizing the use of high-temperature cooling water (90 / 77℃) generated by the internal combustion engine as the driving heat source, with any shortfall regulated by high-temperature flue gas. Most of the high-temperature flue gas enters the two-stage flue gas hot water plate heat exchanger (3) through the right side of the three-way valve (M3). The flue gas temperature is ≥225℃. The high-temperature intermediate water (150 / 120℃) of the first stage of heat exchanger maximizes the power generation of ORC. Its condenser generates low-temperature waste heat (40℃ condensate). The low-temperature cooling water (40 / 30℃) entering the flue gas hot water type lithium bromide unit (2) is closed (i.e., valves a (a) and d (d) are closed). The dual heat source heat pump operates as all low-temperature waste heat recovery devices. The low-temperature heat source water generated by the condensation heat of the ORC low-temperature generator set and the low-temperature cooling water of the internal combustion engine are collected and enter the evaporator of the dual heat source parallel vapor compression type heat pump unit (13) as its first low-temperature heat source. The low-temperature water (25 / 20℃) generated by the second stage heat exchange of the two-stage flue gas hot water plate heat exchanger (3) enters the evaporator of the dual heat source parallel vapor compression type heat pump unit (13) as its second low-temperature heat source. The evaporator absorbs all low-temperature heat sources (low-temperature water from flue gas, ORC condensation waste heat and internal combustion engine intercooling waste heat), and the electric motor drives the compressor to work. The condenser produces 60 / 50℃ domestic hot water to supply heat users or heat storage devices (14).

[0089] In this mode, the system maximizes power output and adjusts the flue gas hot water type lithium bromide unit (2) to the cooling mode to meet the user's cooling load requirements. The high temperature flue gas is mainly used for ORC low temperature power generation, and the dual heat source parallel steam compression heat pump unit is responsible for recovering the low temperature waste heat of the entire system to meet the user's heating needs.

[0090] When the system is in isolated grid or in maximum generation mode during periods of high electricity prices: Maximize power output, high electrical load, and secondary cooling and heating loads. The internal combustion generator set (1) operates at full load, outputting maximum power and generating maximum waste heat at the same time. Close the flow below the electric three-way valve (M3) on the flue (16), and all the flue gas enters the two-stage flue gas hot water plate heat exchanger (3). The high-temperature intermediate water (150 / 120℃) generated by the first stage heat exchange achieves maximum ORC power generation. According to the user's cooling and heating load requirements, the flue gas hot water type lithium bromide uses all the medium-temperature cooling water (90 / 77℃) to drive and switch the corresponding cooling or heating mode. In the cooling mode, the low-temperature heat source of 30 / 40℃ on the dual heat source heat pump side is closed (i.e., valve a (a) and valve d (d) are closed); in the heating mode, the heat pump mode is turned on to absorb the heat of the low-temperature heat source of 30 / 40℃ (i.e., valve a (a) and valve d (d) are opened, and the flow rate is changed through the valve opening on the water circuit) for heating. The dual-heat-source heat pump operates as all low-temperature waste heat recovery devices. The low-temperature heat source water generated by the condensation heat of the ORC low-temperature generator set and the low-temperature cooling water of the internal combustion engine are collected (40 / 30℃) and enter the evaporator of the dual-heat-source parallel vapor compression heat pump unit (13) as its first low-temperature heat source. The low-temperature water (25 / 20℃) generated by the second stage heat exchange of the two-stage flue gas hot water plate heat exchanger (3) enters the evaporator of the dual-heat-source parallel vapor compression heat pump unit (13) as its second low-temperature heat source. The evaporator absorbs all the low-temperature heat sources (low-temperature water from the flue gas, ORC condensation waste heat and internal combustion engine intercooling waste heat), and the electric power drives the compressor to work. The condenser generates 60 / 50℃ domestic hot water to supply heat users or heat storage devices (14). This mode highlights the system's economic dispatch capability. When the value of electricity is the highest, the internal combustion engine runs at full load, the flue gas hot water lithium bromide type switches to single hot water drive mode, and all the flue gas is used for ORC power generation, and the system achieves maximum power output.

[0091] Step 104: In the operating mode, control the distribution and cascade utilization process of the high-temperature flue gas so that it can be used to drive the flue gas hot water type lithium bromide chiller unit for cooling or heating, and to generate a medium-temperature power generation heat source and provide a first low-temperature heat source for the two-stage flue gas hot water plate heat exchanger.

[0092] In some embodiments, precise flow distribution and full-process cascade utilization control are carried out for the high-temperature flue gas of 400-550°C generated by the internal combustion generator set (1). This process is achieved by the interlocking and coordinated action of the three-way valve three (M3) and the temperature controller three (4). The high-temperature flue gas is first discharged into the flue (16) by the internal combustion generator set (1), and arrives at the three-way valve three (M3) through the closed conveying of the flue (16). The system precisely adjusts the opening of the three-way valve three (M3) according to the cooling and heating load and power generation demand of the current target operating mode, and sends part of the high-temperature flue gas to the flue gas hot water type lithium bromide unit (2). The high-grade heat energy of the high-temperature flue gas is used to drive the unit to switch between cooling or heating modes according to the user's demand. After heat exchange, the high-temperature flue gas is cooled to medium-temperature flue gas of 120°C and flows back to the three-way valve three (M3). The returned medium-temperature flue gas is fully mixed with the high-temperature flue gas that did not enter the lithium bromide unit at the three-way valve three (M3). The temperature controller three (4) monitors the temperature of the mixed flue gas in real time and dynamically adjusts it to ensure that the temperature of the mixed flue gas reaches the requirement of not less than 225°C. Then, it is directed to the two-stage flue gas hot water plate heat exchanger (3). The two-stage flue gas hot water plate heat exchanger (3) performs two-stage deep stepped heat exchange on the mixed flue gas. The first stage heat exchange fully extracts the heat energy of the flue gas to generate high-temperature intermediate water at 150°C, which serves as a heat source for medium-temperature power generation to provide energy support for subsequent power generation. The second stage heat exchange further extracts the remaining low-grade heat energy in the flue gas to generate low-temperature intermediate water at 25°C, which serves as the first low-temperature heat source and is transported to the low-temperature waste heat recovery unit. After two stages of heat exchange, the flue gas is cooled to below the dew point temperature (≤30°C) and finally discharged through the chimney (15). The coordinated regulation of the three-way valve and the thermostat ensures the precise matching of flue gas flow and temperature, allowing the high-temperature flue gas to provide the core power for cooling and heating of the lithium bromide unit, as well as a medium-temperature power generation heat source and a primary low-temperature heat source for subsequent processes. This fully taps the full-grade energy value of the high-temperature flue gas, avoids the single utilization and direct loss of flue gas waste heat, and significantly improves the overall recovery and utilization efficiency of high-temperature flue gas waste heat.

[0093] Step 105: Control the organic Rankine cycle power generation process, use the medium-temperature power generation heat source to generate electricity, and simultaneously generate a second low-temperature heat source.

[0094] In some embodiments, after the high-temperature flue gas is utilized in stages and a stable medium-temperature power generation heat source is generated, the organic Rankine cycle generator set (5) is started and precisely controlled to carry out organic Rankine cycle power generation operation according to the preset working conditions. The energy conversion is achieved by relying on the medium-temperature power generation heat source delivered by the two-stage flue gas hot water plate heat exchanger (3) throughout the process.

[0095] The system controls the two-stage flue gas hot water plate heat exchanger (3) to deliver the 150°C high-temperature intermediate water generated by the first stage heat exchange to the evaporator of the organic Rankine cycle generator set (5). This high-temperature intermediate water serves as the core medium-temperature power generation heat source and completes full heat exchange with the organic working fluid inside the unit. It heats the organic working fluid, causing it to expand rapidly after being heated and do work. The expander drives the generator to complete the conversion of mechanical energy into electrical energy, realizing the upgrade and conversion of medium-temperature waste heat into high-grade electrical energy, increasing the system's additional power output and improving the overall power generation output.

[0096] After the organic working fluid completes its heat release, the temperature of the high-temperature intermediate water will drop to 120°C. The system then controls the start of the circulating water pump (17) to provide circulating power for the cooled intermediate water, which is then stably transported back to the heat exchange channel of the two-stage flue gas hot water plate heat exchanger (3) to re-participate in the flue gas heat exchange and temperature rise, forming a closed medium-temperature intermediate water circulation loop to ensure the continuous and stable operation of the organic Rankine cycle power generation process. At the same time, the condenser of the organic Rankine cycle generator set (5) will generate condensation waste heat during the condensation of the organic working fluid. The system uses this condensation waste heat to heat the heat source water of the unit, raising the temperature of the heat source water from 30°C to 40°C. This 40°C heat source water carrying condensation waste heat is the second low-temperature heat source of the system. The system realizes the synchronous generation and collection of this low-temperature heat source while completing power generation, and prepares energy reserves for the subsequent centralized recovery and grade improvement of low-temperature waste heat.

[0097] This step achieves efficient conversion of medium-temperature power generation heat source into electrical energy, upgrading medium-temperature waste heat into high-grade electrical energy, effectively improving the system's total power generation output and energy utilization quality; the closed-loop medium-temperature intermediate water circulation loop avoids medium loss and heat loss, ensuring the continuous and stable operation of the organic Rankine cycle power generation; at the same time, the condensation waste heat generated during the power generation process is collected synchronously as a second low-temperature heat source, converting the "waste heat" of the power generation process into usable low-temperature energy, fully exploring the full-dimensional utilization value of medium-temperature waste heat, and laying an important energy foundation for the system to achieve full recovery of low-temperature waste heat.

[0098] Step 106: The first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source are combined. The first low-temperature heat source enters the evaporator of the dual-heat-source parallel vapor compression heat pump unit for heating. The second low-temperature heat source and the third low-temperature heat source are combined into a single low-temperature heat source, which enters the evaporator of the dual-heat-source parallel vapor compression heat pump unit and / or the flue gas hot water lithium bromide unit for heating.

[0099] In some embodiments, after the system completes organic Rankine cycle power generation and generates various low-temperature heat sources, the three types of low-temperature heat sources generated by the entire system are centrally collected and distributed on demand to realize the targeted utilization and heating operation of low-temperature waste heat.

[0100] The first low-temperature heat source is the 25°C low-temperature intermediate water generated by the second stage heat exchange of the two-stage flue gas hot water plate heat exchanger (3). This heat source is directly and directionally transported to the dual-heat-source parallel steam compression heat pump unit (13) as the core low-temperature heat source to enter the unit for heating operations. After releasing heat, the heat source cools down to 20°C and will subsequently flow back to the two-stage flue gas hot water plate heat exchanger (3) to participate in the circulating heat exchange. The second low-temperature heat source is the 40°C condensate waste heat source water generated by the organic Rankine cycle generator unit (5). The third low-temperature heat source is the 40°C low-temperature cooling water waste heat extracted by the intermediate cooling water heat exchanger (10). Since the two types of heat sources have homogeneous temperatures, the system directly mixes and combines the two to form a unified low-temperature heat source. According to the target operating mode that has been switched, the system accurately distributes the low-temperature heat source after the convergence of the circuit by adjusting the opening and closing of valves a (a), b (b), d (d), and g (g). If it is the summer or transitional season operating mode, all the heat source of the circuit is delivered to the dual heat source parallel vapor compression heat pump unit (13). If it is the heating condition in winter, isolated grid, or high electricity price period, part of the heat source of the circuit is delivered to the flue gas hot water type lithium bromide unit (2), and the remaining part is still delivered to the dual heat source parallel vapor compression heat pump unit (13), so as to realize the heating effect of the low-temperature heat source on the single unit or dual unit. This step realizes the centralized collection and homogenized allocation of various low-temperature heat sources in the system, allowing low-temperature waste heat from different sources to form complementary utilization; at the same time, it realizes the directional delivery of low-temperature heat sources according to the system operation mode, achieving the coordinated or individual heating of the dual heat source parallel steam compression heat pump unit (13) and the flue gas hot water lithium bromide unit (2), fully exploring the heating value of low-temperature waste heat, completely avoiding the waste emission of low-temperature waste heat in traditional technology, and improving the flexibility and energy utilization efficiency of the system heating process.

[0101] The various numerical designations such as "first," "second," etc., used in this application are merely for ease of description and are not intended to limit the scope of the embodiments of this application, nor do they indicate the order of events.

[0102] At least one in this application can also be described as one or more, and multiple can be two, three, four or more, and this application does not impose any limitation. In the embodiments of this application, for a technical feature, the technical features in that technical feature are distinguished by "first", "second", "third", "A", "B", "C" and "D", and there is no order or size among the technical features described by "first", "second", "third", "A", "B", "C" and "D".

[0103] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this application can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this application can be achieved, and this is not limited herein.

[0104] The specific embodiments described above do not constitute a limitation on the scope of protection of this application. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the scope of protection of this application.

Claims

1. A terminal-integrated internal combustion engine combined cooling, heating and power system, characterized in that, include: Internal combustion engine power generation and multi-grade waste heat generation unit, flue gas waste heat cascade utilization unit, organic Rankine cycle power generation unit, low temperature waste heat recovery unit; The internal combustion engine power generation and multi-grade waste heat generation unit is connected to the flue gas waste heat cascade utilization unit and the low temperature waste heat recovery unit respectively, and is used to generate power and generate multi-grade waste heat including high temperature flue gas, high temperature cooling water and low temperature cooling water. The flue gas waste heat cascade utilization unit is connected to the organic Rankine cycle power generation unit and the low temperature waste heat recovery unit respectively, and is used to receive the high temperature flue gas and distribute the high temperature flue gas for driving refrigeration, providing a medium temperature power generation heat source for organic Rankine cycle power generation and providing a first low temperature heat source. The organic Rankine cycle power generation unit is connected to the low-temperature waste heat recovery unit, and is used to generate electricity using the medium-temperature power generation heat source and generate a second low-temperature heat source. The low-temperature waste heat recovery unit is used to receive the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source carried by the low-temperature cooling water, and to improve the heat energy quality of the first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source to output high-temperature hot water.

2. The integrated internal combustion engine combined cooling, heating and power system according to claim 1, characterized in that, The internal combustion engine power generation and multi-grade waste heat generation unit includes an internal combustion generator set, a high-temperature heat dissipation module, and a low-temperature heat dissipation module. The internal combustion generator set is connected to the flue gas waste heat utilization unit through a flue, which is used to transport the high-temperature flue gas generated by the internal combustion generator set to the flue gas waste heat utilization unit for subsequent cascade heat exchange and energy recovery. The high-temperature heat dissipation module is connected to the cooling system of the internal combustion generator set, and is used to recover the heat carried by the high-temperature cooling water and transport the recovered heat to the flue gas waste heat cascade utilization unit. The low-temperature heat dissipation module is connected to the cooling system of the internal combustion generator set and is used to recover the heat carried by the low-temperature cooling water, and to transport the recovered heat as the third low-temperature heat source to the low-temperature waste heat recovery unit and / or the flue gas waste heat cascade utilization unit.

3. The integrated internal combustion engine combined cooling, heating and power system according to claim 2, characterized in that, The high-temperature heat dissipation module includes a lubricating oil cooler and a cylinder liner water heat exchanger connected in series, as well as a cylinder liner water pump, a temperature controller, and a three-way valve. The primary side of the lubricating oil cooler and the cylinder liner water heat exchanger are respectively connected to the lubricating oil cooling circuit and the cylinder liner water cooling circuit of the internal combustion generator set, for receiving and cooling high-temperature lubricating oil and cylinder liner water. The secondary side of the lubricating oil cooler and the cylinder liner water heat exchanger are connected in series to form an intermediate water circulation loop, which is used to absorb heat from the primary side and be heated. The temperature controller and the three-way valve are used to regulate the flow rate of the intermediate water circulation circuit to stabilize the return water temperature of the lubricating oil cooling circuit and the cylinder liner water cooling circuit.

4. The integrated internal combustion engine combined cooling, heating and power system according to claim 2, characterized in that, The low-temperature heat dissipation module includes a medium-cooled water heat exchanger, a medium-cooled water circulating pump, a temperature controller II, a three-way valve II, valve C, and valve E; The primary side of the intermediate cooling water heat exchanger includes the intermediate cooling water circulating pump, the three-way valve II, the intermediate cooling water heat exchanger, and the temperature controller II connected in sequence. The primary side of the intercooled water heat exchanger is connected to the cooling circuit of the turbocharged air intercooler of the internal combustion generator set, and is used to receive and cool the intercooled water. The temperature controller 2 and the three-way valve 2 are used to regulate the flow rate on the primary side of the intercooled water heat exchanger to stabilize the return water temperature of the cooling circuit of the pressurized air intercooler. The intermediate cooling water heat exchanger is connected to the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit through valve c to provide the third low-temperature heat source, and is connected to the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit through valve e to recover the utilized third low-temperature heat source.

5. The integrated internal combustion engine combined cooling, heating and power system according to claim 1, characterized in that, The waste heat utilization unit for flue gas includes a flue, a flue gas hot water type lithium bromide unit, a two-stage flue gas hot water plate heat exchanger, a three-way valve and a temperature controller, and a chimney. The flue gas hot water type lithium bromide unit is connected to the flue through the three-way valve to utilize the high-temperature flue gas for cooling and to generate medium-temperature flue gas. The medium-temperature flue gas is mixed with the high-temperature flue gas through a three-way valve, and after being regulated to a preset temperature by a temperature controller, it is delivered to the two-stage flue gas hot water plate heat exchanger. The two-stage flue gas hot water plate heat exchanger uses the received flue gas to generate electricity and discharges the generated low-temperature flue gas through a chimney. The two-stage flue gas hot water plate heat exchanger is connected to the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit, respectively, and is used to transport the high-temperature intermediate water generated by the first stage heat exchange to the organic Rankine cycle power generation unit to provide heat energy for power generation, and to transport the low-temperature intermediate water generated by the second stage heat exchange to the low-temperature waste heat recovery unit to provide the first low-temperature heat source.

6. The integrated internal combustion engine combined cooling, heating and power system according to claim 5, characterized in that, Also includes: The flue gas hot water type lithium bromide unit is connected to a high-temperature heat dissipation system to recover the heat carried by the high-temperature cooling water and use it for heating. The flue gas hot water type lithium bromide unit is connected to the intermediate cooling water heat exchanger of the low-temperature heat dissipation system via valves a and d, and is used to generate heat using the third low-temperature heat source carried by the low-temperature cooling water.

7. The integrated internal combustion engine combined cooling, heating and power system according to claim 1, characterized in that, The organic Rankine cycle power generation unit includes an organic Rankine cycle generator set, a circulating water pump, valve f, and valve h. The organic Rankine cycle generator set uses high-temperature intermediate water generated by a two-stage flue gas hot water plate and shell heat exchanger to generate electricity. The high-temperature intermediate water is then returned to the two-stage flue gas hot water plate and shell heat exchanger by a circulating water pump to complete the circulation of the high-temperature intermediate water. The organic Rankine cycle generator set transmits heat source water heated by the condensation waste heat generated by the organic Rankine power generation as the second low-temperature heat source to the low-temperature waste heat recovery unit via valve f, and recovers the heat source water to the organic Rankine cycle generator set via valve h.

8. The integrated internal combustion engine combined cooling, heating and power system according to claim 1, characterized in that, The low-temperature waste heat recovery unit includes a dual-heat-source parallel vapor compression heat pump unit, valve b, valve g, circulating water pump two, circulating water pump three, circulating water pump four, and a heat user or heat storage device. The dual-heat-source parallel vapor compression heat pump unit is connected to the two-stage flue gas hot water plate and shell heat exchanger via a second circulating water pump. This is used to transport the first low-temperature heat source after releasing heat to the two-stage flue gas hot water plate and shell heat exchanger to realize the circulation of the first low-temperature heat source. The dual-heat-source parallel vapor compression heat pump unit receives the second heat source and the third heat source via valve b, and then, after releasing heat, the second heat source and the third heat source are respectively transported to the organic Rankine cycle generator unit and the intermediate cooling water heat exchanger via circulating water pump three and valve g, so as to realize the circulation of the second heat source and the third heat source; The dual-heat-source parallel vapor compression heat pump unit is connected to the heat user or heat storage device to deliver the generated high-temperature hot water to the heat user or heat storage device to provide heat energy, and receives the low-temperature return water from the heat user or heat storage device through the circulating water pump.

9. A control method for a terminal-integrated internal combustion engine combined cooling, heating and power system, characterized in that, The method is applied to the integrated internal combustion engine combined cooling, heating and power system as described in any one of claims 1-8, comprising: Control the operation of the internal combustion engine to generate electricity, and simultaneously recover the high-temperature flue gas, high-temperature cooling water and low-temperature cooling water carried by it; Obtain user-side cooling, heating, and electrical load requirements, as well as ambient temperature parameters; Based on the load demand and ambient temperature parameters, the target operating mode of the system is determined, and the system is controlled to switch to the corresponding operating mode. In the operating mode, the distribution and cascade utilization process of the high-temperature flue gas is controlled so that it can be used to drive the flue gas hot water type lithium bromide unit for cooling or heating, and to generate a medium-temperature power generation heat source and provide a first low-temperature heat source for the two-stage flue gas hot water plate heat exchanger. The organic Rankine cycle power generation process is controlled, and the medium-temperature heat source is used to generate electricity, while a second low-temperature heat source is generated simultaneously. The first low-temperature heat source, the second low-temperature heat source, and the third low-temperature heat source are combined. The first low-temperature heat source enters the evaporator of the dual-heat-source parallel vapor compression heat pump unit for heating. The second low-temperature heat source and the third low-temperature heat source are combined into a single low-temperature heat source, which enters the evaporator of the dual-heat-source parallel vapor compression heat pump unit and / or the flue gas hot water lithium bromide unit for heating.

10. The control method for the integrated internal combustion engine combined cooling, heating and power system according to claim 9, characterized in that, The operating modes include at least one of the following: maximum cooling mode in summer, maximum heating mode in winter, flexible operating mode in transition season, and maximum power generation mode during periods of isolated grid or high electricity prices. Determining the target operating mode of the system includes selecting a matching mode from a variety of predefined operating modes based on the priority relationship among the electrical load demand, cooling load demand, and heating load demand, as well as the ambient temperature parameter.

Images