CN-122014372-A - Terminal integrated internal combustion engine combined cooling heating power system and control method thereof

CN122014372ACN 122014372 ACN122014372 ACN 122014372ACN-122014372-A

Abstract

The application provides a terminal integrated internal combustion engine combined cooling heating power system and a control method thereof, and relates to the technical field of combined cooling heating power. The system is cooperatively connected with four large units, performs cascade distribution and full recovery on multi-grade waste heat generated by power generation of the internal combustion engine, ensures that the smoke waste heat takes account of refrigeration, ORC power generation heat source and first low-temperature heat source supply, and 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 the grade of three low-temperature waste heat. The problems of insufficient waste heat utilization and low energy grade matching degree of the traditional system can be solved, and the effects of improving comprehensive energy utilization efficiency and realizing efficient combined supply of cold, heat and electricity are achieved.

Inventors

MA LANFANG
DONG SHUMEI
CHANG NANA
LI WEI
LI HONGBAO
DU LEI
XUE SIYU
GUO CHENG

Assignees

中国华电科工集团有限公司
华电综合智慧能源科技有限公司

Dates

Publication Date: 20260512
Application Date: 20260212

Claims (10)

1. The terminal integrated cooling, heating and power combined supply system of the internal combustion engine is characterized by comprising 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 respectively connected with the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit and is used for generating power and generating multi-grade waste heat comprising high-temperature flue gas, high-temperature cooling water and low-temperature cooling water; The flue gas waste heat cascade utilization unit is respectively connected with the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit and is used for receiving the high-temperature flue gas, distributing the high-temperature flue gas to be used 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 with the low-temperature waste heat recovery unit and is used for generating power by utilizing the medium-temperature power generation heat source and generating a second low-temperature heat source; The low-temperature waste heat recovery unit is used for receiving 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 improving 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.
2. The terminal-integrated combined cooling heating power system of the internal combustion engine according to claim 1, wherein the internal combustion engine power generation and multi-grade waste heat generation unit comprises 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 with the flue gas waste heat cascade utilization unit through a flue and is used for conveying the high-temperature flue gas generated by the internal combustion generator set to the flue gas waste heat cascade utilization unit so as to perform subsequent cascade heat exchange and energy recovery; the high-temperature heat dissipation module is connected with a cooling system of the internal combustion generator set and is used for recovering heat carried by the high-temperature cooling water and conveying the recovered heat to the flue gas waste heat cascade utilization unit; the low-temperature heat dissipation module is connected with a cooling system of the internal combustion generating set and is used for recovering heat carried by the low-temperature cooling water and conveying the recovered heat to the low-temperature waste heat recovery unit and/or the flue gas waste heat cascade utilization unit as the third low-temperature heat source.
3. The terminal-integrated combined cooling, heating and power system of an internal combustion engine according to claim 2, wherein the high-temperature heat dissipation module comprises a lubricating oil cooler and a cylinder liner water heat exchanger, a cylinder liner water pump, a first temperature controller and a first three-way valve which are arranged in series; The primary sides of the lubricating oil cooler and the cylinder liner water heat exchanger are respectively connected to a lubricating oil cooling loop and a cylinder liner water cooling loop of the internal combustion generating set and are used for receiving and cooling high-temperature lubricating oil and cylinder liner water; the lubricating oil cooler and the secondary side of the cylinder liner water heat exchanger are connected in series to form an intermediate water circulation loop which is used for absorbing heat of the primary side and heating; And the first temperature controller and the first three-way valve are used for adjusting the flow of the intermediate water circulation loop so as to stabilize the return water temperature of the lubricating oil cooling loop and the cylinder sleeve water cooling loop.
4. The terminal-integrated combined cooling, heating and power system of the internal combustion engine according to claim 2, wherein the low-temperature heat radiation module comprises an intercooling water heat exchanger, an intercooling water circulating pump, a second temperature controller, a second three-way valve, a second valve c and a valve e; The primary side of the intercooling water heat exchanger comprises the intercooling water circulating pump, the three-way valve II, the intercooling water heat exchanger and the temperature controller II which are sequentially connected; the primary side of the intercooling heat exchanger is connected to a charge air intercooler cooling circuit of the internal combustion generating set for receiving and cooling the intercooling water; The second temperature controller and the second three-way valve are used for adjusting the flow of the primary side of the intercooling water heat exchanger so as to stabilize the return water temperature of the charge air intercooler cooling loop; The intercooled water heat exchanger is respectively connected with the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit through valves c to provide a third low-temperature heat source, and is respectively connected with the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit through valves e to recover the third low-temperature heat source after being utilized.
5. The terminal-integrated internal combustion engine combined cooling heating power system according to claim 1, wherein the flue gas waste heat cascade utilization unit comprises a flue, a flue gas hot water type lithium bromide unit, a two-stage flue gas hot water plate-shell heat exchanger, a three-way valve, a three-temperature controller and a chimney; The flue gas hot water type lithium bromide unit is connected with the flue through the three-way valve III and is used for refrigerating by utilizing the high-temperature flue gas and generating medium-temperature flue gas; the medium-temperature flue gas is mixed with the high-temperature flue gas through a three-way valve III, and is conveyed to the two-stage flue gas hot water plate-shell heat exchanger after being regulated and controlled to a preset temperature through a temperature controller III; the two-stage flue gas hot water plate shell heat exchanger generates power by utilizing the received flue gas, and discharges the generated low-temperature flue gas through a chimney; The two-stage flue gas hot water plate shell heat exchanger is respectively connected with the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit and is used for conveying high Wen Zhongjie water generated by first-stage heat exchange to the organic Rankine cycle power generation unit to provide power generation heat energy and conveying low-temperature intermediate water generated by second-stage heat exchange to the low-temperature waste heat recovery unit to provide the first low-temperature heat source.
6. The terminal-integrated combustion engine cogeneration system of claim 5, further comprising: the flue gas hot water type lithium bromide unit is connected with a high-temperature heat dissipation system and is used for recovering heat carried by the high-temperature cooling water and heating; The flue gas hot water type lithium bromide unit is connected with an intercooled water heat exchanger of the low-temperature heat dissipation system through a valve a and a valve d and is used for heating by utilizing a third low-temperature heat source carried by the low-temperature cooling water.
7. The terminal-integrated internal combustion engine combined cooling heating power system according to claim 1, wherein the organic rankine cycle power generation unit comprises an organic rankine cycle power generation unit, a circulating water pump I, a valve f and a valve h; The organic Rankine cycle generator set utilizes high-temperature intermediate water generated by the two-stage flue gas hot water plate-shell heat exchanger to generate power, and the utilized high-temperature intermediate water is returned to the two-stage flue gas hot water plate-shell heat exchanger through a circulating water pump to complete the circulation of the high-temperature intermediate water; and the organic Rankine cycle generator set transmits heat source water heated by condensation waste heat generated by organic Rankine power generation to the low-temperature waste heat recovery unit as the second low-temperature heat source through a valve f, and recovers the heat source water to the organic Rankine cycle generator set through a valve h.
8. The terminal-integrated combined cooling, heating and power system for an internal combustion engine according to claim 1, wherein the low-temperature waste heat recovery unit comprises a double-heat-source parallel-connection vapor compression heat pump unit, a valve b, a valve g, a circulating water pump II, a circulating water pump III, a circulating water pump IV, a heat user or a heat storage device; The double-heat source parallel connection vapor compression heat pump unit is connected with the two-stage flue gas hot water plate shell heat exchanger through a second circulating water pump and is used for conveying the first low-temperature heat source after releasing heat to the two-stage flue gas hot water plate shell heat exchanger so as to realize the circulation of the first low-temperature heat source; the double-heat-source parallel vapor compression heat pump unit receives the second heat source and the third heat source through the valve b, and respectively transmits the released heat to the organic Rankine cycle power generator unit and the intercooled water heat exchanger through the circulating water pump III and the valve g so as to realize the circulation of the second heat source and the third heat source; The double-heat-source parallel connection vapor compression heat pump unit is connected with the heat user or the heat storage device, and is used for conveying the generated high-temperature hot water to the heat user or the heat storage device to provide heat energy and receiving low-temperature backwater returned by the heat user or the heat storage device through the circulating water pump IV.
9. A control method of a terminal-integrated internal combustion engine combined cooling heating power system, characterized in that the method is applied to the terminal-integrated internal combustion engine combined cooling heating power system according to any one of claims 1 to 8, comprising: Controlling the operation of the internal combustion engine to generate electricity, and synchronously recovering multi-grade waste heat carried by high-temperature flue gas, high-temperature cooling water and low-temperature cooling water generated by the internal combustion engine; acquiring cold, heat and electric load demands and environmental temperature parameters of a user side; determining a target operation mode of a system based on the load demand and the environmental temperature parameter, and controlling the system to switch to a corresponding operation mode; In the operation mode, the distribution and cascade utilization processes of the high-temperature flue gas are controlled so as to drive the flue gas hot water type lithium bromide unit to refrigerate or heat, and the flue gas hot water type lithium bromide unit is used for generating a medium-temperature power generation heat source and providing a first low-temperature heat source by the two-stage flue gas hot water plate shell heat exchanger; controlling an organic Rankine cycle power generation process, utilizing the medium-temperature power generation heat source to generate power, and synchronously generating a second low-temperature heat source; And collecting the first low-temperature heat source, the second low-temperature heat source and the third low-temperature heat source, wherein the first low-temperature heat source enters an evaporator of a double-heat source parallel steam compression type heat pump unit for heating, the second low-temperature heat source and the third low-temperature heat source are collected into one low-temperature heat source, and the second low-temperature heat source enters an evaporator of the double-heat source parallel steam compression type heat pump unit and/or a flue gas hot water type lithium bromide unit for heating.
10. The control method of a terminal-integrated internal combustion engine combined cooling heating and power system according to claim 9, wherein the operation mode includes at least one of a maximum cooling mode in summer, a maximum heating mode in winter, a flexible operation mode in transitional seasons, and a maximum power generation mode in isolated network or high electricity price period; The method comprises the steps of determining a target operation mode of a system, wherein the target operation mode of the system comprises the step of selecting a matched mode from a plurality of predefined operation modes according to the priority relation among the electric load demand, the cold load demand and the heat load demand and the environment temperature parameter.

Description

Terminal integrated internal combustion engine combined cooling heating power system and control method thereof Technical Field The application relates to the technical field of combined cooling heating and power, in particular to a terminal integrated internal combustion engine combined cooling heating and power system and a control method thereof. Background The combined cooling heating and power system taking the gas internal combustion engine as the core is a typical distributed energy utilization mode, and multi-grade waste heat comprising high-temperature flue gas, high-temperature cooling water and low-temperature cooling water can be generated in the power generation process of the system, but the recycling of the multi-grade waste heat by the related technology has obvious defects, and cannot realize the cascade utilization of the full spectrum. In the related art, the waste heat of low-temperature cooling water of an internal combustion engine is regarded as waste heat to be discharged through a cooling tower, the medium-temperature waste heat is lack of effective recovery means, the reasonable step distribution and utilization of high-temperature flue gas are not carried out, a waste heat recovery chain is incomplete, the high-grade waste heat is partially recovered, the low-grade waste heat is largely abandoned, the comprehensive energy utilization rate of the system is low finally, and the integral power generation capacity of the system is difficult to be further improved through the effective utilization of the waste heat. Disclosure of Invention The application provides a terminal integrated cooling, heating and power combined supply system of an internal combustion engine and a control method thereof, which can solve the problems that in the related art, due to the fact that multi-grade waste heat generated by the internal combustion engine is not subjected to full spectrum cascade utilization, high-temperature flue gas is not reasonably distributed and utilized, additional power generation is not realized through medium-temperature waste heat, and various low-temperature waste heat is not collected intensively and the grade of heat energy is improved for utilization, a large amount of low-temperature waste heat is abandoned. According to a first aspect of the present application, there is provided a terminal-integrated combined cooling, heating and power system for an internal combustion engine, comprising: The system comprises an internal combustion engine power generation unit, a 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 respectively connected with the flue gas waste heat cascade utilization unit and the low-temperature waste heat recovery unit and is used for generating power and generating multi-grade waste heat comprising high-temperature flue gas, high-temperature cooling water and low-temperature cooling water; the flue gas waste heat cascade utilization unit is respectively connected with the organic Rankine cycle power generation unit and the low-temperature waste heat recovery unit and is used for receiving the high-temperature flue gas, distributing the high-temperature flue gas to be used for driving refrigeration or 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 with the low-temperature waste heat recovery unit and is used for generating power by utilizing the medium-temperature power generation heat source and generating a second low-temperature heat source; The low-temperature waste heat recovery unit is used for receiving 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 improving 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. Optionally, the internal combustion engine power generation and multi-grade waste heat generation unit comprises 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 with the flue gas waste heat cascade utilization unit through a flue and is used for conveying the high-temperature flue gas generated by the internal combustion generator set to the flue gas waste heat cascade utilization unit so as to perform subsequent cascade heat exchange and energy recovery; the high-temperature heat dissipation module is connected with a cooling system of the internal combustion generator