CN210688181U

CN210688181U - Water supply temperature adjusting system of tower type photo-thermal power station

Info

Publication number: CN210688181U
Application number: CN201921670527.XU
Authority: CN
Inventors: 刘佳宁; 许红; 安丰路; 王力; 张国政; 何洪瑛; 曹成凯; 张庆林
Original assignee: QINGDAO HONGRUI POWER ENGINEERING CONSULTING CO LTD
Current assignee: QINGDAO HONGRUI POWER ENGINEERING CONSULTING CO LTD
Priority date: 2019-10-08
Filing date: 2019-10-08
Publication date: 2020-06-05
Anticipated expiration: 2029-10-08

Abstract

The utility model relates to a water supply temperature regulating system of tower light and heat power station belongs to the technical field in the solar photothermal power field, and it includes fused salt return circuit and steam circuit, steam circuit includes oxygen-eliminating device, high pressure feed water heater, low-load pre-heater and the steam generator of heating feedwater, water after the heat transfer in the high pressure feed water heater passes into the steam generator through the pipeline and spreads into in, the fused salt return circuit includes fused salt, steam generator, cold salt jar, and the fused salt enters into the steam generator and spreads into the water of steam generator with high pressure feed water heater and carries out the heat transfer, and the fused salt after the heat transfer becomes cold salt and passes into the cold salt jar from the steam generator; and a bypass is arranged outside the high-pressure heater in parallel, and two ends of the bypass are respectively communicated with the steam generator and the deaerator. The utility model discloses can replace traditional water supply system operation, and the system is simple, low in cost, but greatly reduced gets into the temperature of the cold salt of cold salt jar to increase the heat-retaining time, economic nature is good.

Description

Water supply temperature adjusting system of tower type photo-thermal power station

Technical Field

The utility model relates to a tower light and heat power station feedwater temperature control system belongs to solar photothermal power field technical field.

Background

Solar photo-thermal power generation is a new solar power generation technology, which is rapidly developed in recent years, but the solar power generation system has the characteristic of intermittence due to the intermittence and the discontinuity of the solar energy resources. In order to prevent the intermittent operation of the power station power generation system from influencing the fluctuation of the load of a power grid and improve the power generation efficiency, the heat storage system is generally arranged by a solar thermal power station.

Because light and heat power station operating condition is complicated, transient state operating condition is many, can get into cold salt jar when heat absorber export fused salt temperature unsatisfied the designing requirement and store, causes cold salt jar high temperature, and cold and hot salt jar difference in temperature diminishes, and the heat-retaining time shortens. The efficiency is lowered and the economy is deteriorated.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a tower light and heat power station feedwater temperature control system replaces traditional water supply system operational mode, and the system is simple, low in cost, but greatly reduced gets into the temperature of the cold salt of cold salt jar to increase the heat-retaining time, economic nature is good.

In order to realize the purpose, the utility model discloses a technical scheme is:

the water supply temperature adjusting system of the tower type photo-thermal power station comprises a molten salt loop and a steam loop, wherein the steam loop comprises a deaerator, a high-pressure heater and a steam generator, the deaerator is used for heating water, water in the deaerator is transmitted to the high-pressure heater through a pipeline, the high-pressure heater is connected with a steam turbine, the water in the high-pressure heater exchanges heat with extracted steam of the steam turbine, the water after heat exchange in the high-pressure heater is transmitted into the steam generator through a pipeline, the molten salt loop comprises molten salt, the steam generator and a cold salt tank, the molten salt enters the steam generator to exchange heat with the water transmitted into the steam generator by the high-pressure heater, and the molten salt after heat exchange is changed into cold salt and is transmitted into the; a water supply bypass is arranged outside the high-pressure heater in parallel, and two ends of the water supply bypass are respectively communicated with the steam generator and the deaerator; a water supply bypass valve is arranged on the water supply bypass; and a water feeding pump is arranged on a pipeline between the deaerator and the water feeding bypass.

The utility model discloses technical scheme's further improvement lies in: and a low-load preheater for preheating feedwater is arranged between the steam generator and the high-pressure heater and between the steam generator and the bypass.

The utility model discloses technical scheme's further improvement lies in: and the condensed water formed after heat exchange in the low-load preheater and the high-pressure heater is transmitted to a water tank above the deaerator through a pipeline to be stored.

The utility model discloses technical scheme's further improvement lies in: and a water supply check valve is arranged on a pipeline between the water supply pump and the bypass and between the water supply pump and the high-pressure heater.

The utility model discloses technical scheme's further improvement lies in: and a feed pump isolating valve is arranged on a pipeline between the feed check valve and the bypass and between the feed check valve and the high-pressure heater.

The utility model discloses technical scheme's further improvement lies in: and a high feeding port isolating valve is arranged on a pipeline between the feed pump isolating valve and the high-pressure heater, and the high feeding port isolating valve is arranged on a pipeline which is close to the high-pressure heater and outside a bypass inlet node.

The utility model discloses technical scheme's further improvement lies in: and the steam generated in the steam generator after heat exchange with the molten salt is conveyed to a steam turbine to do work.

Since the technical scheme is used, the utility model discloses the technological effect who gains has:

1. the utility model adds a bypass and a water supply bypass valve on the basis of the original water supply system. When the temperature of the molten salt in the traditional operation mode does not meet the requirement of the molten salt in the steam generator but is higher than the temperature of the salt returned by the cold salt tank, the temperature of the cold salt in the cold salt tank is too high, the temperature difference between the cold salt tank and the hot salt tank is reduced, and the heat storage efficiency and the heat exchange efficiency are reduced; the temperature of the feed water entering the steam generator is adjusted through the additionally arranged bypass system, so that the temperature of the cold salt entering the cold salt tank is reduced, and the heat storage time is prolonged;

2. the utility model arranges a low-load preheater used for preheating the feed water during the low-load operation between the steam generator and the high-pressure heater and the bypass, and ensures that the molten salt in the steam generator is not solidified by the heating of the low-load preheater;

3. the utility model removes oxygen and other gases in water through the deaerator, can ensure the quality of water and store the water supply, and meanwhile, the deaerator is connected with the high-pressure heater and the low-load preheater, can recycle the condensed water after steam heat exchange and heat the water, balance the water quantity, save energy and protect environment;

4. the utility model discloses a setting up feed water check valve, feed pump isolating valve and high isolation valve of joining, can regulate and control the size of water yield, the temperature of the adjustment system water yield of being convenient for and water.

Drawings

FIG. 1 is a schematic structural diagram of a water supply temperature regulating system of a tower type photothermal power station of the present invention.

The system comprises a deaerator 1, a deaerator 2, a water feeding pump 3, a water feeding check valve 4, a water feeding pump isolation valve 5, a high feeding port isolation valve 6, a water feeding bypass valve 7, a high pressure heater 8, a low load preheater 9, a steam generator 10 and a steam turbine steam extraction pipeline.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments:

the utility model discloses a water temperature control system is given water to tower light and heat power station, as shown in figure 1, including fused salt return circuit and steam circuit, the steam circuit is including heating the oxygen-eliminating device 1 of feedwater, feed pump 2, high pressure feed water heater 7, low-load preheater 8 and steam generator 9, water in the oxygen-eliminating device 1 passes to high pressure feed water heater 7 through the feed pump 2 that sets up on the pipeline, steam turbine extraction pipeline 10 is being connected to high pressure feed water heater 7's opposite side, water in the high pressure feed water heater 7 carries out the steam-water heat transfer with the extraction of steam turbine extraction pipeline 10, then water after the heat transfer in high pressure feed water heater 7 gets into in steam generator 9 after preheating through low-load preheater 8; the low-load preheater 8 and the deaerator 1 also exchange steam and water with the extracted steam in the steam extraction pipeline 10 of the steam turbine. The low-load preheater 8 is not started to operate during the normal operation of the system, and only when the system is started or in the low-load operation of the system, the low-load preheater 8 starts to operate to play a role in heating feedwater transmitted from the high-pressure heater 7 to the steam generator 9 so as to ensure that molten salt in the steam generator 9 is not solidified.

The molten salt loop comprises molten salt, a steam generator 9 and a cold salt tank, the molten salt enters the steam generator 9 from an external heat absorber to exchange heat with water transmitted into the steam generator 9 by the high-pressure heater 7, and the molten salt after heat exchange and temperature reduction is transmitted to the cold salt tank from an A port of the steam generator 9 when the molten salt enters the cold salt tank; the water after heat exchange is changed into steam in the steam generator 9 and then enters the steam turbine from the port B to do work.

The utility model discloses main improvement to prior art lies in, parallelly connected outside high pressure feed water heater 7 sets up the bypass, and the both ends of bypass are linked together with low-load preheater 8 and feed pump 2 respectively. Meanwhile, a water feed check valve 3, a water feed pump isolation valve 4 and a high-load inlet isolation valve 5 are sequentially arranged on a pipeline between the water feed pump 2 and the high-pressure heater 7 along the water feed direction, the inlet node of a bypass is arranged between the water feed pump isolation valve 4 and the high-load inlet isolation valve 5, and the outlet node of the bypass is arranged between the high-pressure heater 7 and the low-load preheater 8; by arranging the water supply check valve, the water supply pump isolating valve and the high-adding isolating valve, the water quantity entering the high-pressure heater 7 and the bypass can be regulated, and the water quantity and the water temperature entering the steam generator 9 by the system can be conveniently regulated; condensed water after steam heat exchange in the low-load preheater 8 and the high-pressure heater 7 is transmitted to the deaerator 1 through pipelines, and the effect of recycling is achieved. A feed water bypass valve 6 is provided on the bypass. When the temperature of the cold salt outlet of the steam generator 9 does not meet the design requirement of entering the cold salt tank, before the molten salt enters the steam generator 9, the water supply bypass valve 6 is opened, the bypass water with lower temperature is mixed with the water supply at the outlet of the high-pressure heater 7, and the mixed water passes through the low-load preheater 8 and exchanges heat with the molten salt in the steam generator 9, so that the temperature of the molten salt is reduced to meet the requirement of entering the cold salt tank.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape, principle and the like of the invention are covered by the protection scope of the invention.

Claims

1. Tower light and heat power station feedwater temperature regulation system, including fused salt return circuit and steam circuit, steam circuit is including heating oxygen-eliminating device (1), high pressure feed water heater (7) and steam generator (9) of feedwater, water in oxygen-eliminating device (1) passes through during pipe transmission reaches high pressure feed water heater (7), the steam turbine is connected in high pressure feed water heater (7), water in high pressure feed water heater (7) and the extraction steam of steam turbine carry out the heat transfer, water after the heat transfer in high pressure feed water heater (7) passes through during pipe transmission steam generator (9), its characterized in that into: the molten salt loop comprises molten salt, a steam generator (9) and a cold salt tank, the molten salt enters the steam generator (9) to exchange heat with water transmitted into the steam generator (9) by the high-pressure heater (7), and the molten salt after heat exchange is changed into cold salt which is transmitted out of the steam generator (9) to the cold salt tank; a water supply bypass is arranged outside the high-pressure heater (7) in parallel, and two ends of the water supply bypass are respectively communicated with the steam generator (9) and the deaerator (1); a water supply bypass valve (6) is arranged on the water supply bypass; and a water feeding pump (2) is arranged on a pipeline between the deaerator (1) and the water feeding bypass.

2. The tower photothermal power station feedwater temperature adjustment system of claim 1, wherein: and a low-load preheater (8) for preheating feedwater is arranged between the steam generator (9) and the high-pressure heater (7) and the bypass.

3. The tower photothermal power station feedwater temperature adjustment system of claim 2, wherein: and condensed water formed after heat exchange in the low-load preheater (8) and the high-pressure heater (7) is transmitted to a water tank above the deaerator (1) through a pipeline to be stored.

4. The tower photothermal power station feedwater temperature adjustment system of claim 1, wherein: and a water supply check valve (3) is arranged on a pipeline between the water supply pump (2) and the bypass and between the water supply pump and the high-pressure heater (7).

5. The tower photothermal power station feedwater temperature adjustment system of claim 4, wherein: and a feed pump isolating valve (4) is arranged on a pipeline between the feed check valve (3) and the bypass and the high-pressure heater (7).

6. The tower photothermal power station feedwater temperature adjustment system of claim 5, wherein: and a high-pressure inlet isolating valve (5) is arranged on a pipeline between the feed pump isolating valve (4) and the high-pressure heater (7), and the high-pressure inlet isolating valve (5) is arranged on a pipeline which is close to the high-pressure heater (7) and outside a bypass inlet node.

7. The tower photothermal power station feedwater temperature adjustment system of claim 1, wherein: and the steam generated in the steam generator (9) after heat exchange with the molten salt is transmitted to a steam turbine to do work.