CN-121993838-A - Heat exchange station energy-saving power supply system based on thermoelectric generation and working method thereof

CN121993838ACN 121993838 ACN121993838 ACN 121993838ACN-121993838-A

Abstract

The invention discloses a heat exchange station energy-saving power supply system based on thermoelectric generation and a working method thereof, and belongs to the technical field of thermoelectric generation. The system comprises a heat exchange station system and a thermoelectric generation system coupled with the heat exchange station system. The heat exchange station system comprises a primary network water loop and a secondary network water loop which are formed by a thermal power plant, a heat exchanger and a heat user. The thermoelectric generation system comprises a hot water diverter valve, a cold water diverter valve and a thermoelectric generator, wherein the thermoelectric generator consists of a hot water heat exchanger, a cold water heat exchanger and a thermoelectric generation device clamped between the hot water heat exchanger and the cold water heat exchanger. And part of the primary net low-temperature water and the secondary net low-temperature backwater are respectively introduced into the hot water heat exchanger and the cold water heat exchanger through the diverter valve, and the stable temperature difference between the two is utilized to drive the thermoelectric power generation device to continuously generate electricity, so that the generated electricity is used for the heat exchange station. The invention efficiently recovers and utilizes the inherent waste heat temperature difference of the system on the premise of not interfering the main heating loop and ensuring the heating quality and safety, thereby reducing the dependence of the heat exchange station on an external power grid and the running power consumption.

Inventors

LIU YUEN
LI YIHENG
WANG HONG
HE KAI
MA GUOFENG
WANG YAN
XU PENGJIANG
Lv kai

Assignees

西安热工研究院有限公司

Dates

Publication Date: 20260508
Application Date: 20260311

Claims (10)

1. The heat exchange station energy-saving power supply system based on the thermoelectric power generation is characterized by comprising a heat exchange station system and a thermoelectric power generation system coupled with the heat exchange station system, wherein the heat exchange station system comprises a thermal power plant (1), a heat exchanger (15), a heat user (2), a primary network water inlet pressure gauge (7), a primary network water return pressure gauge (8), a secondary network water inlet pressure gauge (9) and a secondary network water return pressure gauge (10), wherein a primary network water outlet of the thermal power plant (1) sequentially passes through the primary network water inlet pressure gauge (7), a first inlet of the heat exchanger (15), a first outlet of the heat exchanger (15) and a primary network water inlet of the primary network water return pressure gauge (8) to be connected to a primary network water loop of the thermal power plant (1), and a secondary network water outlet of the heat user (2) sequentially passes through the secondary network water inlet pressure gauge (9), a second inlet of the heat exchanger (15), a second outlet of the heat exchanger (15) and a secondary network water return pressure gauge (10) to be connected to a secondary network water inlet of the heat user (2) to form a secondary network water loop; The thermoelectric power generation system comprises a hot water diverter valve (16), a cold water diverter valve (17) and a thermoelectric generator (20), wherein the thermoelectric generator (20) comprises a hot water heat exchanger (21), a cold water heat exchanger (22) and a thermoelectric power generation device (23), the thermoelectric power generation device (23) is clamped between the hot water heat exchanger (21) and the cold water heat exchanger (22), a primary network water outlet of the thermal power plant (1) is connected with an inlet of the hot water heat exchanger (21) through the hot water diverter valve (16), an outlet of the hot water heat exchanger (21) is converged into a primary network water inlet of the thermal power plant (1) and is used for diverting part of primary network water to the hot water heat exchanger (21), a secondary network water outlet of a hot user (2) is connected with an inlet of the cold water heat exchanger (22) through the cold water diverter valve (17), an outlet of the cold water heat exchanger (22) is converged into a secondary network water inlet of the hot user (2) and is used for diverting part of the secondary network water to the cold water heat exchanger (22), and the primary network water flowing into the hot water heat exchanger (21) and the secondary network water inlet of the cold water heat exchanger (22) are subjected to power generation by the thermoelectric power generation device through the thermoelectric power generation device (23).
2. The energy-saving power supply system of the heat exchange station based on the thermoelectric power generation according to claim 1, wherein the heat exchange station system further comprises a primary net water pump (3) and a secondary net water pump (4), the primary net water pump (3) is arranged between a primary net water outlet of the thermal power plant (1) and a first inlet of the heat exchanger (15), and the secondary net water pump (4) is arranged between a secondary net water outlet of the heat user (2) and a second inlet of the heat exchanger (15).
3. The energy-saving power supply system of the heat exchange station based on the thermoelectric generation according to claim 1, wherein the heat exchange station system further comprises a primary network water flow meter (5) and a secondary network water flow meter (6), the primary network water flow meter (5) is arranged between a primary network water outlet of the thermal power plant (1) and a first inlet of the heat exchanger (15), and the secondary network water flow meter (6) is arranged between a secondary network water outlet of the heat user (2) and a second inlet of the heat exchanger (15).
4. The thermoelectric generation-based heat exchange station energy-saving power supply system according to claim 1, wherein the heat exchange station system further comprises a primary network water inlet thermometer (11) and a secondary network water inlet thermometer (13), the primary network water inlet thermometer (11) is arranged between a primary network water outlet of the thermal power plant (1) and a first inlet of the heat exchanger (15), and the secondary network water inlet thermometer (13) is arranged between a secondary network water outlet of the heat user (2) and a second inlet of the heat exchanger (15).
5. The heat exchange station energy-saving power supply system based on temperature difference power generation according to claim 1, wherein the heat exchange station system further comprises a primary network water return thermometer (12) and a secondary network water return thermometer (14), the primary network water return thermometer (12) is arranged between a first outlet of the heat exchanger (15) and the primary network water return pressure gauge (8), and the secondary network water return thermometer (14) is arranged between a second outlet of the heat exchanger (15) and the secondary network water return pressure gauge (10).
6. The energy-saving power supply system of the heat exchange station based on the thermoelectric power generation according to claim 1, wherein the thermoelectric power generation system further comprises a hot water flowmeter (18) and a cold water flowmeter (19), a primary net water outlet of the thermal power plant (1) is connected to an inlet of the hot water heat exchanger (21) through the hot water flowmeter (18) and the hot water diverter valve (16) in sequence, and a secondary net water outlet of the thermal user (2) is connected to an inlet of the cold water heat exchanger (22) through the cold water flowmeter (19) and the cold water diverter valve (17) in sequence.
7. The energy-saving power supply system of the heat exchange station based on the thermoelectric generation according to claim 1, wherein the hot water heat exchanger (21) adopts a dividing wall type hot water heat exchanger (21), and the cold water heat exchanger (22) adopts a dividing wall type cold water heat exchanger (22).
8. The thermoelectric generation-based heat exchange station energy-saving power supply system according to claim 1, wherein the thermoelectric generator (20) further comprises an electric energy conversion module for converting direct current generated by the thermoelectric generation device (23) into alternating current and supplying power to electric equipment.
9. The heat exchange station energy-saving power supply system based on thermoelectric generation according to claim 1, wherein the thermoelectric generation device (23) is made of P-type bismuth telluride and N-type bismuth telluride materials.
10. The working method of the thermoelectric generation-based heat exchange station energy-saving power supply system as claimed in any one of claims 1 to 9, comprising the following steps: the method comprises the steps of acquiring data of a primary network water inlet pressure gauge (7) and data of a primary network water return pressure gauge (8), and calculating a pipeline pressure difference A of a primary network water loop, wherein the pipeline pressure difference A is specifically as follows: The pipeline pressure difference A of the primary network water loop=the data of the primary network water inlet pressure gauge (7) -the data of the primary network water return pressure gauge (8); The method comprises the steps of obtaining data of a secondary network water inlet pressure gauge (9) and data of a secondary network water return pressure gauge (10), and calculating a pipeline pressure difference B of a secondary network water loop, wherein the pipeline pressure difference B is specifically as follows: the pipeline pressure difference B of the secondary network water loop=the data of the secondary network water inlet pressure gauge (9) -the data of the secondary network water return pressure gauge (10); Judging whether the pipeline pressure difference A of the primary network water loop is equal to the pipeline pressure difference B of the secondary network water loop, if so, maintaining the current opening of the hot water diverter valve (16) and the cold water diverter valve (17); if the judgment result is negative, the opening degree of the hot water flow dividing valve (16) and the opening degree of the cold water flow dividing valve (17) are adjusted, so that the water flow flowing into the hot water heat exchanger (21) and the cold water heat exchanger (22) are basically equal, and the stable temperature difference at the two ends of the temperature difference power generation device (23) is maintained for power generation.

Description

Heat exchange station energy-saving power supply system based on thermoelectric generation and working method thereof Technical Field The invention relates to the technical field of thermoelectric generation, in particular to a heat exchange station energy-saving power supply system based on thermoelectric generation and a working method thereof. Background In a central heating system, a heat exchange station is used as a key facility for connecting a heat source and a user terminal, and plays an important role in safely and efficiently transferring high-temperature heat generated by a thermal power plant to a user heating terminal. The typical operation mode is as follows, the high temperature and high pressure primary network water supply from the thermal power plant is conveyed to the heat exchange station through the primary pipe network and enters the primary side of the heat exchanger (usually a plate heat exchanger), and meanwhile, the low temperature secondary network backwater from the user side enters the secondary side of the heat exchanger. The two are subjected to non-contact heat exchange in the heat exchanger, the temperature of the primary net water is reduced and then returns to the thermal power plant, the temperature of the secondary net water is increased after absorbing heat, the secondary net water is driven by the circulating pump to be conveyed to a user heating system (such as a radiator, a floor heater and the like), and the heat is released and then returned to the heat exchange station, so that a closed circulating heating loop is formed. Currently, the operation of such conventional heat exchange stations is highly dependent on municipal grid power. The core power equipment in the station can work after being connected to a mains supply party, and as the energy cost continuously rises, the mains supply consumption becomes one of the main expenses in the operation of the heat exchange station, and under the long-term operation, the high electric power cost not only obviously increases the operation cost of a heat supply enterprise, compresses the profit space of the heat supply enterprise, but also has adverse effects on the overall economy and energy efficiency level of a heat supply system. Therefore, the prior art has the outstanding defects that the traditional heat exchange station completely depends on external commercial power, so that the running electric charge is heavy, the energy consumption of the system is higher, and the energy conservation, consumption reduction and sustainable development of the heat supply industry are not facilitated. How to effectively reduce the power dependence of a heat exchange station and mine the energy-saving potential of the system on the premise of not affecting the heat supply quality and the system safety becomes a technical problem to be solved in the field. Disclosure of Invention The invention aims to provide an energy-saving power supply system of a heat exchange station based on thermoelectric generation and a working method thereof, so as to solve the problems of heavy running electric charge burden and higher system energy consumption caused by the fact that the traditional heat exchange station completely depends on external commercial power. The invention solves the technical problems by the following technical proposal: the claims are modified by the agent after validation. Compared with the prior art, the invention has the positive progress effects that: The invention provides a heat exchange station energy-saving power supply system based on thermoelectric generation, which comprises a heat exchange station system and a thermoelectric generation system coupled with the heat exchange station system. The heat exchange station system comprises a primary network water loop and a secondary network water loop which are formed by a thermal power plant, a heat exchanger and a heat user. The thermoelectric generation system comprises a hot water diverter valve, a cold water diverter valve and a thermoelectric generator, wherein the thermoelectric generator consists of a hot water heat exchanger, a cold water heat exchanger and a thermoelectric generation device clamped between the hot water heat exchanger and the cold water heat exchanger. And part of the primary net low-temperature water and the secondary net low-temperature backwater are respectively introduced into the hot water heat exchanger and the cold water heat exchanger through the diverter valve, and the stable temperature difference between the two is utilized to drive the thermoelectric power generation device to continuously generate electricity, so that the generated electricity is used for the heat exchange station. The invention effectively recovers and utilizes the inherent waste heat temperature difference of the system on the premise of not interfering the main heat supply loop and ensuring the heat supply quality and safety, obviously reduces the dependence of