CN-121977243-A - Gas and geothermal complementary comprehensive energy supply system for coupling cross-season heat storage and operation method

CN121977243ACN 121977243 ACN121977243 ACN 121977243ACN-121977243-A

Abstract

The invention relates to the technical field of distributed energy supply and renewable energy utilization, and provides a coupling cross-season heat storage gas and geothermal complementary comprehensive energy supply system and an operation method thereof. The system realizes more comprehensive waste heat recycling of the gas generator set, is beneficial to improving the total heat efficiency of the system, solves the problem of space-time mismatch between continuous heat production of the gas generator set and seasonal heat supply requirements of buildings, stores heat recovered under transitional seasons and low-load working conditions to winter or uses heat with peak, realizes cross-season energy dispatching, improves the waste heat utilization efficiency, reduces the operation cost and improves the energy utilization efficiency.

Inventors

XU JINGJING
SU JIANFENG
JIANG TING
XU CONG
XU DAMING
XUE DONG
YAN LICHEN
WANG YUXIANG

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: 20260505
Application Date: 20251209

Claims (10)

1. A gas and geothermal complementary integrated energy supply system for coupling cross-season heat storage, comprising: a gas power generator set (1); The waste heat lithium bromide unit (2) is connected with the gas generator unit (1), and the waste heat lithium bromide unit (2) provides cold and hot services for users by utilizing part of waste heat of the gas generator unit (1); the cross-season heat storage subsystem (9) is connected with the gas generator set (1), and the cross-season heat storage subsystem (9) is used for recovering and storing the other part of waste heat of the gas generator set (1); The ground source heat pump system is connected with the cross-season heat storage subsystem (9), and the ground source heat pump system provides cold and hot services for users by utilizing the waste heat stored by the cross-season heat storage subsystem (9).
2. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system according to claim 1, The waste heat lithium bromide unit (2) provides cold and hot services for users by utilizing the high Wen Gangtao water of the gas generator unit (1) and the waste heat in the high-temperature flue gas; And the seasonal heat storage subsystem (9) is used for recycling the waste heat of high Wen Gangtao water and medium cold water of the gas generator set (1).
3. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system according to claim 2, The gas generator set further comprises a first heat radiating device (7) which is connected with a water channel with the height Wen Gangtao of the gas generator set (1); The waste heat of the high Wen Gangtao water of the gas generator set (1) is preferentially utilized by the waste heat lithium bromide unit (2), when the temperature of cylinder liner water discharged from the waste heat lithium bromide unit (2) is higher than a first target value, waste heat of the high Wen Gangtao water of the gas generator set (1) is recovered by the cross-season heat storage subsystem (9), and when the backwater temperature of the high Wen Gangtao water of the gas generator set (1) is higher than a second target value, heat dissipation and cooling are carried out on the high Wen Gangtao water of the gas generator set (1) by the first heat dissipation device (7).
4. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system according to claim 2, The second heat radiating device (8) is connected with an intercooling waterway of the gas generator set (1); And when the backwater temperature of the intermediate cold water of the gas generator set (1) is higher than a target value, radiating and cooling the intermediate cold water of the gas generator set (1) through the second radiating device (8).
5. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system according to claim 2, The waste heat in the high-temperature flue gas of the gas generator set (1) is utilized by the waste heat lithium bromide unit (2) to form low-temperature flue gas, and the cross-season heat storage subsystem (9) is used for recovering the waste heat in the low-temperature flue gas.
6. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system of claim 5, The low-temperature flue gas heat exchange device (4) and the heat storage water tank (6) are also included; The low-temperature flue gas heat exchange device (4) is connected with a flue gas outlet pipeline of the waste heat lithium bromide unit (2); the heat storage water tank (6) is connected with the low-temperature flue gas heat exchange device (4) and the cross-season heat storage subsystem (9); The high-temperature flue gas exhausted by the gas generator set (1) is preferentially fed into the waste heat lithium bromide unit (2) for utilization, the low-temperature flue gas exhausted by the waste heat lithium bromide unit (2) is fed into the low-temperature flue gas heat exchange device (4) for heat recovery of the low-temperature flue gas, hot water generated after the heat recovery of the low-temperature flue gas heat exchange device (4) is preferentially fed into the heat storage water tank (6) so as to meet the requirement of a user, and when the external heat load requirement is low or a non-heating working condition is met, the heat in the hot water generated by the low-temperature flue gas heat exchange device (4) is recovered through the cross-season heat storage subsystem (9).
7. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system of claim 5, The cross-season heat storage subsystem (9) comprises an area A heat storage buried coil (901), an area B heat storage buried coil (902) and an area C heat storage buried coil (903); the heat storage buried coil pipe (901) in the area A is used for storing the waste heat of water with the height Wen Gangtao; the heat storage buried coil pipe (902) in the area B is used for storing the waste heat of low-temperature flue gas; The C-region heat storage buried coil (903) is used for storing the waste heat of cold water; The A-area heat storage buried coil (901), the B-area heat storage buried coil (902) and the C-area heat storage buried coil (903) are connected with the ground source heat pump system.
8. The coupling cross-season heat storage fuel gas and geothermal complementary integrated energy supply system of claim 7, The heat storage buried coil (901), the heat storage buried coil (902) and the heat storage buried coil (903) are arranged in concentric circles or concentric rectangles, and the heat storage buried coil (901), the heat storage buried coil (902) and the heat storage buried coil (903) are sequentially arranged from inside to outside.
9. An operation method of a fuel gas and geothermal complementary comprehensive energy supply system for coupling cross-season heat storage is characterized by comprising the following steps: The lithium bromide unit (2) is used for providing cold and hot services for users by utilizing the residual heat in the cylinder sleeve water and the high-temperature flue gas of the gas generator unit (1); The cylinder sleeve water and the intercooling water of the gas generator set (1) are recovered through the seasonal heat storage subsystem (9) and become the residual heat in the low-temperature flue gas after being utilized by the residual heat lithium bromide unit (2); the heat stored by the cross-season heat storage subsystem (9) is utilized by the ground source heat pump system to provide cold and hot services for users.
10. The method of operating a coupled cross-season heat storage gas and geothermal complementary integrated energy delivery system of claim 9, When the cylinder sleeve water heat of the gas generator set (1) is recycled, the method specifically comprises the following steps: the waste heat of water Wen Gangtao with high water content of the gas generator set (1) is preferentially utilized by the waste heat lithium bromide unit (2); when the temperature of cylinder liner water discharged from the waste heat lithium bromide unit (2) is higher than a first target value, waste heat of high Wen Gangtao water of the gas generator unit (1) is recovered by utilizing the cross-season heat storage subsystem (9); When the backwater temperature of high Wen Gangtao water of the gas generator set (1) is higher than a second target value, radiating and cooling the high Wen Gangtao water of the gas generator set (1) through a first radiating device (7); When the intercooling water heat of the gas generator set (1) is recycled, the method specifically comprises the following steps: the waste heat of the middle cold water of the gas generator set (1) is recovered by the cross-season heat storage subsystem (9) preferentially; When the backwater temperature of the intercooling water of the gas generator set (1) is higher than a target value, radiating and cooling the intercooling water of the gas generator set (1) through a second radiating device (8); when the medium-high temperature flue gas of the gas generator set (1) is recycled, the method specifically comprises the following steps: the high-temperature flue gas exhausted by the gas generator set (1) is led to enter the waste heat lithium bromide unit (2) for utilization preferentially; The low-temperature flue gas exhausted by the waste heat lithium bromide unit (2) enters a low-temperature flue gas heat exchange device (4) to recover the heat of the low-temperature flue gas; The hot water generated after the low-temperature flue gas heat exchange device (4) recovers heat preferentially enters the heat storage water tank (6) to meet the demands of users; And when the external heat load demand is low or the non-heating working condition is not met, the heat in the hot water generated by the low-temperature flue gas heat exchange device (4) is recovered through the cross-season heat storage subsystem (9).

Description

Gas and geothermal complementary comprehensive energy supply system for coupling cross-season heat storage and operation method Technical Field The invention relates to the technical field of distributed energy supply and renewable energy utilization, in particular to a coupling cross-season heat storage gas and geothermal complementary comprehensive energy supply system and an operation method. Background With the popularization of novel energy systems and clean energy, distributed energy systems are widely used. The gas distributed energy supply system is widely applied to energy supply of commercial buildings and parks in China due to higher energy utilization efficiency and smaller environmental pollution. The prime mover of a gas distributed energy supply system is typically a gas internal combustion engine and a gas turbine. The gas distributed energy supply system using the internal combustion engine as a prime motor is often applied to the scenes of clustered buildings such as large commercial office parks, schools, hospitals and the like. However, the seasonal demand characteristics of the energy consumption of the user scene are obvious, the load fluctuation is larger, a large amount of high-temperature waste heat can be generated in the operation process of the power generation system of the gas internal combustion engine, and the generated waste heat resource is generally mismatched with the demand of the user in time and space. Meanwhile, the system supplies energy for meeting peak load of users, the capacity of the unit is often configured according to the maximum load when the system is designed, the load demand is lower or no demand exists in transitional seasons, the problem that a large maraca trolley is frequently arranged when the system operates, the annual operation time and the system utilization rate are low and the like is caused, the operation cost of the system is high, and project benefits cannot be guaranteed. Disclosure of Invention Therefore, the invention aims to solve the problems of common time and space mismatch, low system utilization rate and high operation cost of the generated waste heat resources and user demands caused by a large amount of high-temperature waste heat generated in the operation process of the gas distributed energy supply system in the prior art, and provides a gas and geothermal complementary comprehensive energy supply system for coupling cross-season heat storage and an operation method thereof. In order to solve the technical problems, the technical scheme of the invention is as follows: The invention provides a gas and geothermal complementary comprehensive energy supply system for coupling cross-season heat storage, which comprises a gas generator set, a waste heat lithium bromide unit, a cross-season heat storage subsystem and a ground source heat pump system, wherein the waste heat lithium bromide unit is connected with the gas generator set and provides cold and hot services for users by utilizing part of waste heat of the gas generator set, the cross-season heat storage subsystem is connected with the gas generator set and is used for recovering and storing the other part of waste heat of the gas generator set, and the ground source heat pump system is connected with the cross-season heat storage subsystem and provides cold and hot services for users by utilizing the waste heat stored by the cross-season heat storage subsystem. Furthermore, the waste heat lithium bromide unit provides cold and hot services for users by utilizing the waste heat in the high Wen Gangtao water and the high-temperature flue gas of the gas generator unit, and the cross-season heat storage subsystem recovers the waste heat of the high Wen Gangtao water and the medium cold water of the gas generator unit. Further, the coupling cross-season heat storage gas and geothermal complementary comprehensive energy supply system further comprises a first heat dissipation device connected with a water channel with the height Wen Gangtao of the gas generator set, waste heat of water with the height Wen Gangtao of the gas generator set is preferentially utilized by the waste heat lithium bromide set, when the temperature of cylinder liner water discharged from the waste heat lithium bromide set is higher than a first target value, waste heat of water with the height Wen Gangtao of the gas generator set is recovered by the cross-season heat storage subsystem, and when the backwater temperature of water with the height Wen Gangtao of the gas generator set is higher than a second target value, heat dissipation and cooling are conducted on water with the height Wen Gangtao of the gas generator set through the first heat dissipation device. Furthermore, the coupling cross-season heat storage gas and geothermal complementary comprehensive energy supply system further comprises a second heat dissipation device which is connected with an intercooling waterway of the gas generator set, t