CN-122015059-A - Boiler complementary five-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage

CN122015059ACN 122015059 ACN122015059 ACN 122015059ACN-122015059-A

Abstract

The embodiment of the disclosure provides a complementary five-stage steam supply system of a coupled double-tank indirect solar photo-thermal energy storage boiler, which comprises a solar photo-thermal energy storage subsystem, a multi-stage heat exchange steam supply subsystem and a cogeneration unit, wherein the multi-stage heat exchange steam supply subsystem is provided with a first industrial steam supply interface, a cold reheat steam pipeline of a high-pressure tank is provided with a second industrial steam supply interface, a main steam pipeline of the boiler is provided with a third industrial steam supply interface, a heat reheat steam pipeline is provided with a fourth industrial steam supply interface, a steam exhaust pipeline between a medium-pressure tank and a low-pressure tank is provided with a fifth industrial steam supply interface, the solar photo-thermal energy storage subsystem comprises a mirror field, a solar tower, a molten salt storage heat exchanger, an indirect double-tank heat release system and a main heat exchanger, when solar illumination is insufficient, high-temperature molten salt in the heat tank is introduced into the molten salt storage heat exchanger to release heat, the molten salt storage heat exchanger exchanges heat with the main heat, and the main heat exchanger absorbing heat exchanges heat with the multi-stage heat exchange steam supply subsystem.

Inventors

QU ZHIZHONG
ZHANG CHENYU
LI YUHUI
GENG HONGWEI
LI XIAODONG
MIAO HONGFEI
LI HUAWEI
HUANG WEN
ZHANG PEIJIE
WANG HAO
WANG DONGYE
WANG HONGTAO
LIU XUELIANG
YANG LI
GU YUHENG
XUE CHENXI
LIU WEIQI
JIANG XUDONG
Wang Shishuo
Chen Meiduan
FENG XIANGYUAN
HE YAN
YANG QINGCHUAN
YU XIAOBING
Ma tingshan
LIU JIPING

Assignees

华能洛阳热电有限责任公司
西安热工研究院有限公司
西安西热节能技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260105

Claims (10)

1. The boiler complementary five-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage is characterized by comprising a solar photo-thermal energy storage subsystem, a multi-stage heat exchange steam supply subsystem connected with the solar photo-thermal energy storage subsystem and a cogeneration unit, wherein the cogeneration unit comprises a boiler, and a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a generator which are sequentially connected; The multi-stage heat exchange steam supply subsystem is provided with a first industrial steam supply interface, a cold reheat steam pipeline of the high-pressure cylinder is provided with a second industrial steam supply interface, a main steam pipeline of the boiler is provided with a third industrial steam supply interface, a hot reheat steam pipeline between the boiler and the medium-pressure cylinder is provided with a fourth industrial steam supply interface, and a steam exhaust pipeline between the medium-pressure cylinder and the low-pressure cylinder is provided with a fifth industrial steam supply interface; The solar photo-thermal energy storage subsystem comprises a lens field, a solar tower arranged corresponding to the lens field, a molten salt storage heat exchanger connected with the solar tower, an indirect double-tank heat release system connected with the molten salt storage heat exchanger and a main heat exchanger connected with the molten salt storage heat exchanger, wherein the indirect double-tank heat release system comprises a heat tank and a cold tank which are arranged at intervals and respectively connected with the molten salt storage heat exchanger; When the solar illumination is insufficient, high-temperature molten salt in the heat tank is led into the molten salt storage heat exchanger to release heat, the molten salt storage heat exchanger exchanges heat with the main heat exchanger, and the main heat exchanger absorbing heat exchanges heat with the multi-stage heat exchange steam supply subsystem, wherein the molten salt released in the molten salt storage heat exchanger flows back to the cold tank.
2. The complementary five-stage steam supply system of a coupled double-tank indirect solar photo-thermal energy storage boiler of claim 1, wherein the multi-stage heat exchange steam supply subsystem comprises a second-stage heat exchanger and a third-stage heat exchanger which are connected in series through pipelines, and a first-stage heat exchanger which is connected in parallel with the third-stage heat exchanger; the steam outlet of the first-stage heat exchanger is communicated with the hot reheat steam pipeline, and the steam outlet of the third-stage heat exchanger is communicated with the main steam pipeline.
3. The complementary five-stage steam supply system of the coupled double-tank indirect solar photo-thermal energy storage boiler of claim 2, further comprising a deaerator communicated with the medium pressure cylinder, wherein the deaerator is respectively communicated with the boiler, and condensate inlets of the first-stage heat exchanger, the second-stage heat exchanger and the third-stage heat exchanger through pipelines, and the second-stage heat exchanger is provided with a first industrial steam supply interface.
4. The boiler complementary five-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage of claim 3, further comprising a first booster pump, a first booster pump and a second booster pump, wherein the first booster pump is arranged in a pipeline between the deaerator and a condensate inlet of the second stage heat exchanger; the second booster pump is arranged on a pipeline of the condensate inlet of the first-stage heat exchanger.
5. The boiler complementary five-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage of claim 3, further comprising a condenser, wherein the condenser is arranged in a pipeline between a dead steam outlet of the low-pressure cylinder and the deaerator.
6. The system of claim 5, further comprising a multi-stage low-pressure reheater arranged in a pipeline between the condenser and the deaerator and communicated with the low-pressure cylinder.
7. The system of claim 6, further comprising a first feedwater pump disposed in a conduit between the condenser and the multi-stage low pressure reheater and a second feedwater pump disposed in a conduit between the multi-stage low pressure reheater and the deaerator; The multi-stage low-pressure reheater comprises a first low-pressure reheater, a second low-pressure reheater, a third low-pressure reheater and a fourth low-pressure reheater which are arranged in a pipeline between the condenser and the deaerator and are respectively communicated with the low-pressure cylinder.
8. The system of claim 6, further comprising a multi-stage high pressure reheater disposed in a conduit between the boiler and the deaerator and communicating the high pressure cylinder with the intermediate pressure cylinder.
9. The dual-tank indirect solar photo-thermal energy storage coupled boiler complementary five-stage steam supply system according to claim 8, wherein the multi-stage high-pressure reheater comprises a first high-pressure reheater and a second high-pressure reheater which are arranged in a pipeline between the boiler and the deaerator and are respectively communicated with the high-pressure cylinder, and a third high-pressure reheater communicated with the medium-pressure cylinder.
10. The system of claim 8, further comprising a third feedwater pump disposed in a conduit between the deaerator and the multi-stage high pressure reheater.

Description

Boiler complementary five-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage Technical Field The embodiment of the disclosure belongs to the technical field of energy utilization, and particularly relates to a coupling double-tank indirect solar photo-thermal energy storage boiler complementary five-stage steam supply system. Background Under the requirement of the double carbon index of the current carbon peak carbon neutralization, the ratio of renewable energy sources such as wind, light and the like is more remarkable, however, the renewable energy sources such as wind, light and the like have the characteristics of intermittence, volatility and the like, and bring new challenges to a power grid. Under the background, under the requirement of providing industrial steam supply, the thermal power generating unit needs to frequently participate in peak shaving, so that the existing thermal power generating unit meets the parameter requirement of high-pressure industrial steam supply by adopting a main steam temperature and pressure reduction mode under a low-load working condition, and further, the thermal economy of the thermal power generating unit is poor and the coal consumption is improved. The national development reform commission and the national energy bureau issue notification about development of modification and upgrading of the national coal electric motor set, namely overall consideration of coal-electricity energy-saving and consumption-reducing modification, heat supply modification and flexibility modification manufacturing, and realize 'three-modification' linkage. The common industrial steam supply technology of the existing cogeneration unit comprises four modes of cold steam extraction and heat supply, hot steam extraction and heat supply, main steam temperature and pressure reduction and heat supply, main steam back press heat supply and the like. For the most commonly used 300 MW-level thermal power generating unit in China, the cold re-steam extraction heat supply and the hot re-steam extraction heat supply are difficult to provide industrial parameters of 3MPa under the working condition of 50% THA, the steam supply demand of 100t/h of steam supply quantity, the main steam temperature and pressure reduction heat supply can meet the high-pressure steam supply demand under the low-load working condition, but the main steam temperature and pressure reduction heat supply is poor in economy and difficult to meet the 'three-change' linkage demand, the main steam back pressure machine is used for supplying heat in a steam supply mode, a new back pressure machine factory building is needed, a back pressure machine is purchased and matched with related valves are needed, the early investment cost is high, and particularly, the economic benefit is unstable under the condition of fluctuation of the steam supply demand. Therefore, how to solve the above-mentioned problems is a technical problem to be solved by those skilled in the art. Disclosure of Invention The embodiment of the disclosure aims at least solving one of the technical problems in the prior art and provides a complementary five-stage steam supply system of a coupled double-tank indirect solar photo-thermal energy storage boiler. In one aspect of embodiments of the present disclosure, there is provided a boiler complementary five-stage steam supply system coupling double-tank indirect solar photo-thermal energy storage, comprising: The system comprises a solar photo-thermal energy storage subsystem, a multi-stage heat exchange steam supply subsystem connected with the solar photo-thermal energy storage subsystem and a cogeneration unit, wherein the cogeneration unit comprises a boiler, and a high-pressure cylinder, a medium-pressure cylinder, a low-pressure cylinder and a generator which are sequentially connected; The multi-stage heat exchange steam supply subsystem is provided with a first industrial steam supply interface, a cold reheat steam pipeline of the high-pressure cylinder is provided with a second industrial steam supply interface, a main steam pipeline of the boiler is provided with a third industrial steam supply interface, a hot reheat steam pipeline between the boiler and the medium-pressure cylinder is provided with a fourth industrial steam supply interface, and a steam exhaust pipeline between the medium-pressure cylinder and the low-pressure cylinder is provided with a fifth industrial steam supply interface; The solar photo-thermal energy storage subsystem comprises a lens field, a solar tower arranged corresponding to the lens field, a molten salt storage heat exchanger connected with the solar tower, an indirect double-tank heat release system connected with the molten salt storage heat exchanger and a main heat exchanger connected with the molten salt storage heat exchanger, wherein the indirect double-tank heat release system comprises a heat tank and a cold tan