CN-122015300-A - Boiler complementary multi-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage

Abstract

The invention provides a complementary multi-stage steam supply system of a boiler for coupling double-tank indirect solar photo-thermal energy storage, which comprises a solar energy storage system, a double-tank heat release system, a multi-stage heater, a thermal power supply system and a steam supply system, wherein the solar energy storage system comprises a solar energy tower, a molten salt storage heat exchanger and a molten salt main heat exchanger which are connected with a molten salt outlet of the solar energy tower, the molten salt outlet of the molten salt main heat exchanger is connected with a molten salt inlet of the multi-stage heater, the double-tank heat release system comprises a hot tank and a cold tank, the thermal power supply system comprises a boiler, a heat recovery system and a steam turbine, a water supply port of the boiler and the heat recovery system is connected with a water inlet of the multi-stage heater, a steam outlet of the multi-stage heater and a steam inlet of the steam turbine are connected with the steam supply system, and under the condition that the power grid depth peak regulation requirement is met, the steam supply requirement of a unit can be guaranteed, and the power generation coal consumption of the unit can be reduced.

Inventors

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

Assignees

• 西安热工研究院有限公司
• 华能洛阳热电有限责任公司
• 西安西热节能技术有限公司

Dates

Publication Date

20260512

Application Date

20260105

Claims (8)

1. 1. A complementary multi-stage steam supply system of a coupled double-tank indirect solar photo-thermal energy storage boiler is characterized by comprising a solar energy storage system, a double-tank heat release system, a multi-stage heater, a thermal power heating system and a steam supply system, wherein, The solar energy storage system comprises a solar energy tower, a molten salt storage heat exchanger and a molten salt main heat exchanger which are respectively connected with a molten salt outlet of the solar energy tower, wherein the molten salt outlet of the molten salt main heat exchanger is connected with a molten salt inlet of the multistage heater; The double-tank heat release system comprises a hot tank and a cold tank, wherein the hot tank and the cold tank are connected with the molten salt storage heat exchanger, the hot tank is used for storing high-temperature molten salt and providing high-temperature molten salt under the condition of insufficient solar illumination, and the cold tank is used for storing low-temperature molten salt; the thermal power heating system comprises a boiler, a heat recovery system and a steam turbine, wherein a water supply port of the boiler and a water supply port of the heat recovery system are connected with a water inlet of the multi-stage heater, and a steam outlet of the multi-stage heater and a steam outlet of the boiler are connected with a steam inlet of the steam turbine; The multistage heater is connected with the steam outlet of the boiler through the steam supply system.
2. 2. The system of claim 1, wherein the multi-stage heater comprises a main heater and the steam turbine comprises a high pressure cylinder, wherein, The molten salt outlet of the molten salt main heat exchanger is connected with the molten salt inlet of the main heater; The water inlet of the main heater is connected with the heat recovery system and the water feeding port of the boiler, the main steam outlet of the main heater is connected with the main steam inlet of the high-pressure cylinder through a main steam pipeline, and the water feeding absorbs heat in the main heater to form high-temperature steam which enters the high-pressure cylinder together with the main steam generated by the main heater.
3. 3. The system of claim 2, wherein the steam supply system comprises a main steam supply subsystem connected to the main steam line for providing industrial steam of the 3-24MPa class.
4. 4. The system of claim 2, wherein the cold reheat outlet of the high pressure cylinder is connected to the cold reheat inlet of the boiler by a cold reheat line, wherein, The steam supply system comprises a cold re-industrial steam supply subsystem which is connected with a cold re-steam pipeline and is used for providing industrial steam with the grade of 1.5 MPa.
5. 5. The system of claim 2, wherein the multi-stage heater further comprises a first stage heater and the steam turbine comprises a medium pressure cylinder, wherein, The molten salt inlet of the first-stage heater is connected with the molten salt outlet of the molten salt main heat exchanger, the hot re-steam outlet of the first-stage heater is connected with the hot re-steam inlet of the medium pressure cylinder through a hot re-steam pipeline, the first-stage heater is also connected with the water feeding mouth of the heat recovery system and the water feeding mouth of the boiler, and water is fed into the medium pressure cylinder together with the hot re-steam generated by the first-stage heater after absorbing heat in the first-stage heater to form high-temperature steam.
6. 6. The system of claim 5, wherein the steam supply system comprises a thermal re-steam supply subsystem coupled to the thermal re-steam line for providing industrial steam on the order of 1.5 MPa.
7. 7. The system of claim 5, wherein the multi-stage heater further comprises a second stage heater having a molten salt inlet connected to the molten salt outlet of the main heater and the molten salt outlet of the first stage heater, respectively, the molten salt outlet of the second stage heater being connected to the molten salt inlet of the molten salt main heat exchanger.
8. 8. The system of claim 7, wherein the second stage heater is further connected to a steam supply line, the steam supply system comprising a molten salt industrial steam supply subsystem connected to the steam supply line, and The second-stage heater is also connected with a water feeding mouth of the heat recovery system, and the water is absorbed by the second-stage heater to form high-temperature steam for providing industrial steam with the grade of 1.5MPa for the molten salt industrial steam supply subsystem.

Description

Boiler complementary multi-stage steam supply system for coupling double-tank indirect solar photo-thermal energy storage Technical Field The disclosure belongs to the technical field of energy utilization, and in particular relates to a coupling double-tank indirect solar photo-thermal energy storage boiler complementary multi-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 two-stage 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 high-pressure industrial steam supply technology commonly used by 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 heat supply and main steam back press heat supply. 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 quantity of 100t/h is required, the main steam temperature and pressure reduction heat supply can meet the high-pressure steam supply requirement under the low-load working condition, but the main steam temperature and pressure reduction heat supply is required to supply heat in a steam supply mode of a main steam back press, a new back pressure machine factory building is required, the back press and a matched associated valve are also required, the early investment cost is high, and particularly under the condition of fluctuation of the steam supply requirement, the economic benefit is unstable. Disclosure of Invention The utility model aims at solving at least one of the technical problems existing in the prior art, and provides a complementary multistage steam supply system of a coupling double-tank indirect solar photo-thermal energy storage boiler. In one aspect of the disclosure, a complementary multi-stage steam supply system for a boiler is provided, which is coupled with a double-tank indirect solar photo-thermal energy storage system, the system comprises a solar energy storage system, a double-tank heat release system, a multi-stage heater, a thermal power heating system and a steam supply system, wherein, The solar energy storage system comprises a solar energy tower, a molten salt storage heat exchanger and a molten salt main heat exchanger which are respectively connected with a molten salt outlet of the solar energy tower, wherein the molten salt outlet of the molten salt main heat exchanger is connected with a molten salt inlet of the multistage heater; The double-tank heat release system comprises a hot tank and a cold tank, wherein the hot tank and the cold tank are connected with the molten salt storage heat exchanger, the hot tank is used for storing high-temperature molten salt and providing high-temperature molten salt under the condition of insufficient solar illumination, and the cold tank is used for storing low-temperature molten salt; the thermal power heating system comprises a boiler, a heat recovery system and a steam turbine, wherein a water supply port of the boiler and a water supply port of the heat recovery system are connected with a water inlet of the multi-stage heater, and a steam outlet of the multi-stage heater and a steam outlet of the boiler are connected with a steam inlet of the steam turbine; The multistage heater is connected with the steam outlet of the boiler through the steam supply system. Optionally, the multi-stage heater comprises a main heater, the steam turbine comprises a high pressure cylinder, wherein, The molten salt outlet of the molten salt main heat exchanger is connected with the molten salt inlet of the main heater; The water inlet of the main heater is connected with the heat recovery system and the water feeding port of the boiler, the main steam outlet of the main heater is connected with the main steam inlet of the high-pressure cylinder through a main steam pipeline, and the water feeding absorbs heat in the main heater to form high-temperature steam which enters the high-pressure cylinder together with the main steam generated by the main heater. Optional