CN-122015299-A - Boiler complementary multi-stage steam supply system for coupling solar photo-thermal energy storage of inclined temperature layer

Abstract

The invention provides a complementary multi-stage steam supply system of a boiler for coupling solar photo-thermal energy storage of an inclined temperature layer, which comprises a solar energy storage system, 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, an inclined temperature layer heat storage tank, a main heat exchanger and a multi-stage heater, the solar energy tower is respectively connected with the molten salt storage heat exchanger and the main heat exchanger, the molten salt storage heat exchanger is respectively connected with the inclined temperature layer heat storage tank and the main heat exchanger, the main heat exchanger is connected with the multi-stage heater, the thermal power heating system comprises a boiler, a heat recovery system and a steam turbine, a water supply port of the boiler and a steam outlet of the heat recovery system are connected with a steam inlet of the multi-stage heater, the multi-stage heater is connected with the steam outlet of the boiler, and the multi-stage heater is connected with the steam supply system, so that under the condition of meeting the requirements of deep peak regulation of a power grid, the power supply of industrial steam supply can be guaranteed, and the power consumption of a unit can be reduced.

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 (9)

1. 1. A complementary multi-stage steam supply system of a boiler for coupling solar photo-thermal energy storage of an inclined temperature layer is characterized by comprising a solar energy storage system, 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, an inclined temperature layer heat storage tank, a main heat exchanger and a multi-stage heater; The solar tower is respectively connected with the molten salt storage heat exchanger and the main heat exchanger, the molten salt storage heat exchanger is respectively connected with the inclined temperature layer heat storage tank and the main heat exchanger, and the main heat exchanger is connected with the multi-stage heater; 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 sloped-layer heat storage tank comprises a high temperature molten salt reservoir located in an upper region and a low temperature molten salt reservoir located in a lower region; the high-temperature molten salt storage part and the low-temperature molten salt storage part are connected with the molten salt storage heat exchanger, the high-temperature molten salt storage part stores high-temperature molten salt, and the low-temperature molten salt storage part stores low-temperature molten salt; when the solar energy illumination is insufficient, the high-temperature molten salt of the high-temperature molten salt storage part enters the molten salt storage heat exchanger to release heat, and the molten salt medium of the main heat exchanger absorbs heat in the molten salt storage heat exchanger and releases heat in the main heat exchanger to provide heat for the multi-stage heater.
3. 3. The system of claim 1, wherein the multi-stage heater comprises a first stage heater and the steam turbine comprises a high pressure cylinder, wherein, The molten salt outlet of the main heat exchanger is connected with the molten salt inlet of the first-stage heater; The water inlet of the first-stage heater is connected with the heat recovery system and the water supply port of the boiler, and the main steam outlet of the first-stage heater is connected with the main steam inlet of the high-pressure cylinder through a main steam pipeline.
4. 4. A system according to claim 3, wherein the steam supply system comprises a main steam supply line connected to the main steam line for providing industrial steam of the order of 3-24 MPa.
5. 5. The system of claim 3, 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 pipeline connected with the cold re-steam pipeline and is used for providing industrial steam with the grade of 1.5 MPa.
6. 6. The system of claim 3, wherein the multi-stage heater further comprises a second stage heater and the steam turbine comprises a medium pressure cylinder, wherein, The molten salt inlet of the second-stage heater is connected with the molten salt outlet of the main heat exchanger, the hot re-steam outlet of the second-stage heater is connected with the hot re-steam outlet of the boiler through a hot re-steam pipeline and the hot re-steam inlet of the medium pressure cylinder, and the second-stage heater is also connected with the water feeding mouth of the heat recovery system and the water feeding mouth of the boiler.
7. 7. The system of claim 6, wherein the steam supply system comprises a hot reheat steam supply line connected to the hot reheat steam line for providing industrial steam on the order of 1.5 MPa.
8. 8. The system of claim 6, wherein the multi-stage heater further comprises a third stage heater, a molten salt inlet of the third stage heater being connected to a molten salt outlet of the first stage heater and a molten salt outlet of the second stage heater, respectively, the molten salt outlet of the third stage heater being connected to the molten salt inlet of the main heat exchanger, the third stage heater further being connected to a feed water inlet of the regenerative system.
9. 9. The system of claim 8, wherein the steam supply system comprises a molten salt industrial steam supply line connected to a third stage heater steam supply line for providing industrial steam of the 1.5MPa class.

Description

Boiler complementary multi-stage steam supply system for coupling solar photo-thermal energy storage of inclined temperature layer Technical Field The disclosure belongs to the technical field of energy utilization, and particularly relates to a complementary multi-stage steam supply system of a boiler for coupling solar photo-thermal energy storage of an inclined temperature layer. Background The current renewable energy source duty ratio of wind, light and the like is more remarkable, however, the renewable energy source of wind, light and the like has the characteristics of intermittence, volatility and the like, and brings new challenges to the 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 boiler for coupling solar photo-thermal energy storage of an inclined temperature layer. In one aspect of the disclosure, a complementary multi-stage steam supply system for a boiler is provided, wherein the complementary multi-stage steam supply system is coupled with solar photo-thermal energy storage of an inclined temperature layer, and comprises a solar energy storage system, 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, an inclined temperature layer heat storage tank, a main heat exchanger and a multi-stage heater; The solar tower is respectively connected with the molten salt storage heat exchanger and the main heat exchanger, the molten salt storage heat exchanger is respectively connected with the inclined temperature layer heat storage tank and the main heat exchanger, and the main heat exchanger is connected with the multi-stage heater; 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 oblique temperature layer heat storage tank comprises a high temperature molten salt storage part positioned in an upper area and a low temperature molten salt storage part positioned in a lower area; the high-temperature molten salt storage part and the low-temperature molten salt storage part are connected with the molten salt storage heat exchanger, the high-temperature molten salt storage part stores high-temperature molten salt, and the low-temperature molten salt storage part stores low-temperature molten salt; when the solar energy illumination is insufficient, the high-temperature molten salt of the high-temperature molten salt storage part enters the molten salt storage heat exchanger to release heat, and the molten salt medium of the main heat exchanger absorbs heat in the molten salt storage heat exchanger and releases heat in the main heat exchanger to provide heat for the multi-stage heater. Optionally, the multi-stage heater comprises a first s