CN-121977194-A - Boiler complementary steam supply system and method for coupling double-tank active solar photo-thermal system

Abstract

The invention provides a complementary steam supply system and method of a coupled double-tank active solar photo-thermal boiler, wherein the system comprises a solar photo-thermal energy storage system, a molten salt energy storage system, a main heat exchanger and a coal-fired unit which are connected in sequence; the fused salt energy storage system comprises a low-temperature fused salt storage tank and a high-temperature fused salt storage tank, wherein an inlet of a solar energy tower of the solar photo-thermal energy storage system is connected with an outlet of the low-temperature fused salt storage tank, an outlet of the solar energy tower is connected with an inlet of the high-temperature fused salt storage tank, a first inlet of a main heat exchanger is connected with an outlet of the high-temperature fused salt storage tank, a first outlet of the main heat exchanger is connected with an inlet of the low-temperature fused salt storage tank, a second outlet of the main heat exchanger is connected with a main steam pipeline at a first outlet of a boiler of the coal-fired unit, and a second inlet of the main heat exchanger is connected with a water supply pipeline at the first inlet of the boiler. The system creatively combines the solar photo-thermal energy storage system with the traditional coal-fired unit, realizes the continuous and reliable combination of new energy clean low carbon and coal electricity, and can assist in energy conservation and emission reduction.

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

20260505

Application Date

20260105

Claims (10)

1. 1. The boiler complementary steam supply system of the active solar photo-thermal of a coupling double tank, characterized by comprising a solar photo-thermal energy storage system, a molten salt energy storage system, a main heat exchanger and a coal-fired unit which are connected in sequence; The fused salt energy storage system comprises a low-temperature fused salt storage tank and a high-temperature fused salt storage tank, the solar photo-thermal energy storage system comprises a solar tower, and the coal-fired unit comprises a boiler; The inlet of the solar tower is connected with the outlet of the low-temperature molten salt storage tank, and the outlet of the solar tower is connected with the inlet of the high-temperature molten salt storage tank; The first inlet of the main heat exchanger is connected with the outlet of the high-temperature molten salt storage tank, and the first outlet of the main heat exchanger is connected with the inlet of the low-temperature molten salt storage tank; the second outlet of the main heat exchanger is connected with a main steam pipeline at the first outlet of the boiler, and the second inlet of the main heat exchanger is connected with a water supply pipeline at the first inlet of the boiler.
2. 2. The system of claim 1, further comprising a first stage heat exchanger, wherein the coal-fired unit further comprises a deaerator; the first inlet of the first-stage heat exchanger is connected with a condensate pipeline at the outlet of the deaerator, the first outlet of the first-stage heat exchanger is connected with a reheat steam pipeline at the second outlet of the boiler, and the condensate pipeline is provided with a water pump for boosting condensate.
3. 3. The system of claim 2, wherein the second inlet of the first stage heat exchanger is connected to the outlet of the high temperature molten salt storage tank and the first inlet of the main heat exchanger, respectively; And the second outlet of the first-stage heat exchanger is connected with the inlet of the low-temperature molten salt storage tank.
4. 4. The system of claim 3 further comprising a second stage heat exchanger positioned between the main heat exchanger and the low temperature molten salt storage tank, wherein, The first inlet of the second-stage heat exchanger is connected with the first outlet of the main heat exchanger, and the first outlet of the second-stage heat exchanger is connected with the inlet of the low-temperature molten salt storage tank; the first inlet of the second stage heat exchanger is also connected to the second outlet of the first stage heat exchanger.
5. 5. The system of claim 4, wherein the second inlet of the second stage heat exchanger is connected to a condensate line at the deaerator outlet, wherein, And after the condensed water is boosted, absorbing heat in the second-stage heat exchanger to form industrial steam supply, and then carrying out external heat supply.
6. 6. The system of claim 1, wherein a cold reheat master is provided at the second inlet of the boiler, wherein, And directly carrying out industrial steam supply after extracting steam from the cold re-steam main pipe.
7. 7. A method for providing complementary steam for a boiler coupling double-tank active solar photo-thermal, characterized in that the method comprises the following steps of: In a sufficient sunlight state, the low-temperature molten salt is conveyed from the low-temperature molten salt tank to the solar tower, absorbs solar photo-heat in the solar tower and is conveyed to the high-temperature molten salt tank for storage; In the operation process of the coal-fired unit, conveying the high-temperature molten salt in the high-temperature molten salt storage tank to the main heat exchanger for heat release, and then conveying the high-temperature molten salt to the low-temperature molten salt storage tank; The feed water at the first inlet of the boiler is conveyed to the main heat exchanger to absorb heat to form high-temperature and high-pressure steam, and then is conveyed to a main steam pipeline at the first outlet of the boiler through the first outlet of the main heat exchanger.
8. 8. The method of claim 7, wherein the method further comprises: the condensed water at the outlet of the deaerator is pressurized and then is conveyed to the first-stage heat exchanger, high-temperature steam is formed after heat absorption in the first-stage heat exchanger, and then the condensed water is conveyed to a reheat steam pipeline at the second outlet of the boiler.
9. 9. The method of claim 8, wherein the method further comprises: And the condensed water at the outlet of the deaerator is pressurized and then is conveyed to the second-stage heat exchanger, and the second-stage heat exchanger absorbs heat to form 3MPa grade industrial steam supply for external heat supply.
10. 10. The method of claim 7, wherein the method further comprises: extracting steam from the cold re-steam main pipe to directly perform industrial steam supply with the grade of 1.5 MPa.

Description

Boiler complementary steam supply system and method for coupling double-tank active solar photo-thermal system Technical Field The invention belongs to the technical field of energy utilization, and particularly relates to a complementary steam supply system and method for a coupling double-tank active solar photo-thermal boiler. Background At present, 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 demand of 100t/h of steam supply is high, 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 economy is poor, the main steam back press steam supply mode is adopted for supplying heat, a new back pressure machine factory building is needed, a back press and a matched associated valve are purchased, the early investment cost is high, and particularly, the economic benefit is unstable under the condition of fluctuation of the steam supply demand. In view of the above problems, it is necessary to provide a complementary steam supply system and method for a coupled double-tank active solar photo-thermal boiler, which are reasonable in design and effective in solving the above problems. Disclosure of Invention The invention aims at solving at least one of the technical problems in the prior art and provides a complementary steam supply system and method for a coupled double-tank active solar photo-thermal boiler. The invention provides a coupling double-tank active solar photo-thermal boiler complementary steam supply system, which comprises a solar photo-thermal energy storage system, a molten salt energy storage system, a main heat exchanger and a coal-fired unit which are connected in sequence; The fused salt energy storage system comprises a low-temperature fused salt storage tank and a high-temperature fused salt storage tank, the solar photo-thermal energy storage system comprises a solar tower, and the coal-fired unit comprises a boiler; The inlet of the solar tower is connected with the outlet of the low-temperature molten salt storage tank, and the outlet of the solar tower is connected with the inlet of the high-temperature molten salt storage tank; The first inlet of the main heat exchanger is connected with the outlet of the high-temperature molten salt storage tank, and the first outlet of the main heat exchanger is connected with the inlet of the low-temperature molten salt storage tank; the second outlet of the main heat exchanger is connected with a main steam pipeline at the first outlet of the boiler, and the second inlet of the main heat exchanger is connected with a water supply pipeline at the first inlet of the boiler. Optionally, the system also comprises a first-stage heat exchanger, and the coal-fired unit also comprises a deaerator; the first inlet of the first-stage heat exchanger is connected with a condensate pipeline at the outlet of the deaerator, the first outlet of the first-stage heat exchanger is connected with a reheat steam pipeline at the second outlet of the boiler, and the condensate pipeline is provided with a water pump for boosting condensate. Optionally, the second inlet of the first-stage heat exchanger is respectively connected with the outlet of the high-temperature molten salt storage tank and the first inlet of the main heat exchanger; And the second outlet of the first-stage heat exchanger is connected with the inlet of the low-temperature molten salt storage tank. Optionally, the system further comprises a second stage heat exchanger positioned between the main heat exchanger and the low temperature molten salt storage tank, wherein, The first inlet of the second-stage heat exchanger is c