CN-116105386-B - Photo-thermal composite ammonia absorption type multi-energy combined supply system

CN116105386BCN 116105386 BCN116105386 BCN 116105386BCN-116105386-B

Abstract

The invention provides a photo-thermal composite ammonia absorption type multi-energy co-generation system, and relates to the technical field of thermodynamic systems. The photo-thermal composite ammonia absorption type multi-energy combined supply system comprises a heat collection and storage subsystem, an energy storage subsystem, a refrigeration subsystem and a power generation subsystem, wherein the heat collection and storage subsystem is suitable for heating a heat-conducting medium by utilizing solar energy so as to store a large amount of heat in the heat-conducting medium and can heat by utilizing part of heat, the energy storage subsystem is suitable for heating a concentrated ammonia water solution by utilizing the heat of the heat-conducting medium and separating the concentrated ammonia water solution to generate a dilute ammonia water solution and liquid ammonia, the refrigeration subsystem is suitable for absorbing the heat of a cold storage medium by utilizing a liquid ammonia throttling expansion process and storing cold, and the power generation subsystem is suitable for heating the liquid ammonia by utilizing the heat of the heat-conducting medium to generate high-pressure ammonia steam and driving a generator set to generate power by utilizing the high-pressure ammonia steam. The photo-thermal composite ammonia absorption type multi-energy combined supply system provided by the invention can realize combined supply of cold energy, heat energy and electric energy by utilizing renewable energy sources, and improves the energy utilization rate.

Inventors

SUN CHANGPING
ZHENG ZHIMEI
XIE NINGNING
MEI SHENGWEI
XUE XIAODAI
LU QIANG
WANG YAZHOU
LEI XIAO
YIN LIKUN
DING RUOCHEN

Assignees

中国长江三峡集团有限公司
清华大学

Dates

Publication Date: 20260505
Application Date: 20230109

Claims (6)

1. A photo-thermal composite ammonia absorption type multi-energy co-generation system, comprising: The solar heat collection and storage system comprises a heat collection and storage subsystem, wherein a heat conduction medium is arranged in the heat collection and storage subsystem, and the heat collection and storage subsystem is suitable for heating the heat conduction medium by utilizing solar energy; the energy storage subsystem is provided with a concentrated ammonia water solution, and is suitable for heating the concentrated ammonia water solution by utilizing the heat of the heat conducting medium and separating to generate a dilute ammonia water solution and liquid ammonia; the refrigeration subsystem is provided with a cold storage medium and is suitable for absorbing heat of the cold storage medium by utilizing the liquid ammonia through throttling expansion; the power generation subsystem comprises a power generation unit, and is suitable for heating the liquid ammonia by utilizing the heat of the heat conducting medium to generate high-pressure ammonia steam and driving the power generation unit to generate power by utilizing the high-pressure ammonia steam; The heat collection and storage subsystem comprises a solar heat collection mirror field, a high-temperature heat conduction oil tank, a heat storage water tank and a low-temperature heat conduction oil tank which are sequentially connected, wherein a heat conduction medium is stored in the high-temperature heat conduction oil tank and the low-temperature heat conduction oil tank, and a heating heat storage medium is arranged in the heat storage water tank; The energy storage subsystem comprises a concentrated ammonia water storage tank, a generator, a separator, a condenser and a liquid ammonia storage tank which are connected in sequence, and the generator is connected with the heat collection and storage subsystem; the energy storage subsystem further comprises a dilute ammonia water storage tank, and the dilute ammonia water storage tank is connected with the separator; The concentrated aqueous ammonia solution is stored in the concentrated aqueous ammonia storage tank, the diluted aqueous ammonia solution is stored in the diluted aqueous ammonia storage tank, and the liquid ammonia is stored in the liquid ammonia storage tank; The refrigerating subsystem comprises an evaporator, an absorber, a solution exchanger and a cold storage water tank which are sequentially connected, wherein the evaporator is connected with the liquid ammonia storage tank through a second connecting valve, and the solution exchanger is connected with the concentrated ammonia water storage tank and the dilute ammonia water storage tank; The generator set comprises a supercharging device, a turbine expansion unit and a generator, wherein the inlet end of the turbine expansion unit is connected with the liquid ammonia storage tank, the outlet end of the turbine expansion unit is connected with the absorber, the supercharging device is connected with the liquid ammonia storage tank, and the generator is connected with the turbine expansion unit; the supercharging device is also connected with the heat collection and storage subsystem; The photo-thermal composite ammonia absorption type multi-energy combined supply system can independently operate one of a heat storage mode, an energy storage mode, a cold storage mode and a power generation mode, can simultaneously operate the energy storage mode and the heat storage mode, can simultaneously operate the energy storage mode and the cold storage mode, can simultaneously operate the energy storage mode, the heat storage mode and the cold storage mode, can simultaneously operate the power generation mode and the heat storage mode, can simultaneously operate the power generation mode and the cold storage mode, can simultaneously operate the power generation mode, the heat storage mode and the cold storage mode, and can simultaneously operate the heat storage mode and the cold storage mode.
2. The photo-thermal composite ammonia absorption type multi-energy co-generation system according to claim 1, further comprising a cooling tower connected with the condenser and the absorber.
3. The photo-thermal composite ammonia absorption type multi-energy co-generation system according to claim 1, wherein a first connecting valve is arranged between the generator and the heat collection and storage subsystem.
4. The photo-thermal composite ammonia absorption type multi-energy co-supply system according to claim 1, wherein a second connecting valve is arranged between the evaporator and the liquid ammonia storage tank.
5. The photo-thermal composite ammonia absorption type multi-energy combined supply system according to claim 1, wherein a third connecting valve is arranged between the supercharging device and the liquid ammonia storage tank, a fourth connecting valve is arranged between the supercharging device and the heat collection and storage subsystem, and a fifth connecting valve is arranged between the turbine expansion unit and the liquid ammonia storage tank.
6. The photo-thermal composite ammonia absorption type multi-energy co-generation system according to any one of claims 1 to 5, wherein the heat collection and storage subsystem further comprises a heat conduction oil pipeline, and the heat conduction medium circulates in the heat conduction oil pipeline.

Description

Photo-thermal composite ammonia absorption type multi-energy combined supply system Technical Field The invention relates to the technical field of thermodynamic systems, in particular to a photo-thermal composite ammonia absorption type multi-energy combined supply system. Background Renewable energy sources are applied to a plurality of technical fields such as power generation, heating, refrigeration and the like, and are beneficial to reducing carbon emission and realizing green development. Due to the fact that the renewable energy source is intermittently and unstably utilized due to various factors such as geographical environment, resource conditions and the like, the development of corresponding energy storage technology becomes an effective way for realizing continuous utilization of the renewable energy source. Meanwhile, thermodynamic systems capable of realizing combined supply of cold energy, heat energy and electric energy are also gaining more importance. In some remote areas, the heat supply network cannot cover, the power supply is relatively tension, and the heating and cooling by adopting an electric driving mode have great difficulty. Therefore, the development of a small-scale combined cooling heating and power system based on renewable energy sources has important significance. Disclosure of Invention The present invention is directed to solving at least one of the technical problems existing in the related art. Therefore, the invention provides a photo-thermal composite ammonia absorption type multi-energy combined supply system, which can realize the combined supply of cold energy, heat energy and electric energy by utilizing renewable energy sources and improve the energy utilization rate. The embodiment of the invention provides a photo-thermal composite ammonia absorption type multi-energy co-supply system, which comprises: The solar heat collection and storage system comprises a heat collection and storage subsystem, wherein a heat conduction medium is arranged in the heat collection and storage subsystem, and the heat collection and storage subsystem is suitable for heating the heat conduction medium by utilizing solar energy; the energy storage subsystem is provided with a concentrated ammonia water solution, and is suitable for heating the concentrated ammonia water solution by utilizing the heat of the heat conducting medium and separating to generate a dilute ammonia water solution and liquid ammonia; the refrigeration subsystem is provided with a cold storage medium and is suitable for absorbing heat of the cold storage medium by utilizing the liquid ammonia through throttling expansion; The power generation subsystem comprises a power generation unit, and is suitable for heating the liquid ammonia by utilizing the heat of the heat conducting medium to generate high-pressure ammonia steam and driving the power generation unit to generate power by utilizing the high-pressure ammonia steam. According to the photo-thermal composite ammonia absorption type multi-energy co-generation system provided by the embodiment of the invention, the heat collection and storage subsystem, the energy storage subsystem, the refrigeration subsystem and the power generation subsystem are integrated together, the photo-thermal collection technology is adopted to enrich solar photo-thermal, and heat exchange is carried out between the heat conduction, heat storage and cold storage working mediums, so that the heating and refrigerating requirements of users can be met, and energy storage and electric power output can be realized. Specifically, the heat collecting and storing subsystem uses solar energy as heat collecting energy, the collected heat is used for heating the heat conducting medium, and a large amount of heat is stored in the heated heat conducting medium, wherein part of the heat in the heat conducting medium can be transferred to the heating and storing medium, so that the heating and storing medium can be heated at a high temperature, a user can heat the heating and storing medium to meet the heating requirement, and the other part of the heat in the heat conducting medium can drive the operation of the photo-thermal composite ammonia absorption type multi-energy combined supply system. The energy storage subsystem can heat the concentrated ammonia water solution by utilizing the heat of the heat conducting medium, and the concentrated ammonia water is separated into liquid ammonia and a diluted ammonia water solution after being heated and stored. In the refrigerating subsystem, the stored liquid ammonia absorbs the heat of a cold storage medium through throttling expansion, so that the temperature of the cold storage working medium is reduced, the cold is stored, meanwhile, the liquid ammonia is changed into ammonia steam after heat exchange and is mixed with a dilute ammonia water solution to generate a concentrated ammonia water solution again to be stored in the energy storage