阅读说明：本技术 一种发电机定子冷却水余热利用装置及方法 (Generator stator cooling water waste heat utilization device and method ) 是由 王涛 伍刚 牛坤 刘岗 宋晓辉 张泉 于 2021-01-28 设计创作，主要内容包括：一种发电机定子冷却水余热利用装置及方法,包括吸收式热泵主体,所述吸收式热泵主体包括依次循环相连的吸收式热泵发生器、吸收式热泵冷凝器、吸收式热泵蒸发器与吸收式热泵吸收器；吸收式热泵吸收器的热水进口与暖通集水器相连,吸收式热泵吸收器与吸收式热泵发生器之间的进回程管道上设置溶液热交换器进行换热,吸收式热泵吸收器热水出口连接至吸收式热泵冷凝器热水进口,吸收式热泵冷凝器热水出口与暖通分水器连通；吸收式热泵蒸发器上连接有定冷水泵,吸收式热泵蒸发器出口与定冷水冷却器及发电机依次相连,发电机定冷水出口连接至定冷水泵入口。本发明具有运行可靠、余热回收率高、经济效益强等特点。(A device and a method for utilizing the waste heat of cooling water of a generator stator comprise an absorption heat pump main body, wherein the absorption heat pump main body comprises an absorption heat pump generator, an absorption heat pump condenser, an absorption heat pump evaporator and an absorption heat pump absorber which are sequentially connected in a circulating manner; a hot water inlet of the absorption heat pump absorber is connected with the heating and ventilation water collector, a solution heat exchanger is arranged on an inlet return pipeline between the absorption heat pump absorber and the absorption heat pump generator for heat exchange, a hot water outlet of the absorption heat pump absorber is connected to a hot water inlet of a condenser of the absorption heat pump, and a hot water outlet of the condenser of the absorption heat pump is communicated with the heating and ventilation water separator; the absorption heat pump evaporator is connected with a fixed cold water pump, the outlet of the absorption heat pump evaporator is sequentially connected with a fixed cold water cooler and a generator, and the fixed cold water outlet of the generator is connected to the inlet of the fixed cold water pump. The invention has the characteristics of reliable operation, high waste heat recovery rate, strong economic benefit and the like.)

1. The device for utilizing the waste heat of the cooling water of the generator stator is characterized by comprising an absorption heat pump main body, wherein the absorption heat pump main body comprises an absorption heat pump generator (7), an absorption heat pump condenser (8), an absorption heat pump evaporator (9) and an absorption heat pump absorber (10) which are sequentially connected in a circulating manner;

a hot water inlet of the absorption heat pump absorber (10) is connected with the heating ventilation water collector (2), a solution heat exchanger (11) is arranged on a return pipeline between the absorption heat pump absorber (10) and the absorption heat pump generator (7) for heat exchange, a hot water outlet of the absorption heat pump absorber (10) is connected to a hot water inlet of an absorption heat pump condenser (8), and a hot water outlet of the absorption heat pump condenser (8) is communicated with the heating ventilation water collector (3);

the absorption heat pump evaporator (9) is connected with a fixed cold water pump (5), the outlet of the absorption heat pump evaporator (9) is sequentially connected with a fixed cold water cooler (6) and a generator (1), and the fixed cold water outlet of the generator (1) is connected to the inlet of the fixed cold water pump (5).

2. The device for utilizing the waste heat of the cooling water of the generator stator as claimed in claim 1, wherein a hot water circulating pump (16) is arranged between the heating, ventilating and water collecting device (2) and the absorption heat pump absorber (10).

3. The generator stator cooling water waste heat utilization device according to claim 1, characterized in that a solution pump (15) is arranged from the absorption heat pump absorber (10) to the absorption heat pump generator (7) in a solution process pipeline; a pressure reducing valve (14) is arranged on the solution return stroke from the absorption heat pump generator (7) to the absorption heat pump absorber (10).

4. The generator stator cooling water waste heat utilization device according to claim 1, characterized in that an expansion valve (13) is arranged between a working medium outlet of the absorption heat pump condenser (8) and a working medium pipeline of the absorption heat pump evaporator (9).

5. The generator stator cooling water waste heat utilization device according to claim 1, characterized in that a heat source inlet of the absorption heat pump generator (7) is connected with a flow regulating valve (17), a heat source outlet of the absorption heat pump generator (7) is connected with an automatic steam trap (18), and an output end of the automatic steam trap (18) is connected with a steam condenser drain flash tank (19).

6. The generator stator cooling water waste heat utilization device according to claim 1, characterized in that a heating and ventilation steam-water heat exchanger (12) is arranged in a pipeline between the absorption heat pump condenser (8) and the heating and ventilation water separator (3), and the heating and ventilation steam-water heat exchanger and the heating and ventilation water separator are arranged in series.

7. The generator stator cooling water waste heat utilization device according to claim 1, characterized in that the outlet pipeline of the absorption heat pump evaporator (9) and the stator cooling water cooler (6) are arranged in series.

8. The generator stator cooling water waste heat utilization device according to claim 1, characterized in that an expansion tank (4) is arranged in an inlet pipeline of the fixed cooling water pump (5), and a fixed cooling water system is in a closed circulation mode.

9. The use method of the generator stator cooling water waste heat utilization device is characterized by comprising the following steps;

when the heat pump device is started, a plant area heat supply backwater and constant cooling water system is firstly put into operation, and then a flow regulating valve (17) is opened; after the temperature of the heating water rises, controlling the heating ventilation steam-water heat exchanger (12) to reduce the opening degree, and keeping the inlet water temperature of the heating ventilation water separator (3) constant; after the temperature of the stator cooling water is reduced, the stator cooling water cooler (6) is gradually controlled to quit the operation, and the water inlet temperature of the generator is kept constant; the heat pump device takes the water inlet temperature of the generator as the primary control quantity, and the steam quantity is adjusted through a flow regulating valve (17) to ensure that the constant cold water maintains the required operating temperature of the generator. When the temperature of the heating water can not meet the heating requirement, the compensation is carried out through the heating ventilation steam-water heat exchanger (12).

Technical Field

The invention relates to the technical field of waste heat recovery and utilization of power plants, energy conservation and environmental protection, in particular to a device and a method for utilizing waste heat of cooling water of a generator stator.

Background

The power plant as a primary energy consumer has a large amount of heat discharged to the external environment through the low-temperature cooling water system. With the continuous deepening of the policy of energy conservation and emission reduction in China and the continuous development of energy conservation and environmental protection technologies, waste heat utilization becomes an important way for promoting energy conservation and emission reduction in the power industry. The absorption heat pump is used for converting low-level heat generated in the operation of a power plant into high-level heat for utilization, and the method has the potential of energy conservation and emission reduction.

In the running process of the generator, heat generated by the stator core needs to be taken away through the stator cooling water system, the stator cooling water enters the generator at the temperature of about 40 ℃ for heat exchange, and the temperature of outlet water can reach about 60 ℃. The flow of the fixed cooling water system of the large-scale unit is about 100m³And h, transferring the part of heat to a cooling water system through a heat exchanger to cause heat loss.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a device and a method for utilizing the waste heat of the cooling water of the stator of the generator.

In order to achieve the purpose, the invention adopts the technical scheme that:

a generator stator cooling water waste heat utilization device comprises an absorption heat pump main body, wherein the absorption heat pump main body comprises an absorption heat pump generator 7, an absorption heat pump condenser 8, an absorption heat pump evaporator 9 and an absorption heat pump absorber 10 which are sequentially connected in a circulating manner;

a hot water inlet of the absorption heat pump absorber 10 is connected with the heating ventilation water collector 2, a solution heat exchanger 11 is arranged on an inlet return pipeline between the absorption heat pump absorber 10 and the absorption heat pump generator 7 for heat exchange, a hot water outlet of the absorption heat pump absorber 10 is connected to a hot water inlet of an absorption heat pump condenser 8, and a hot water outlet of the absorption heat pump condenser 8 is communicated with the heating ventilation water distributor 3;

the absorption heat pump evaporator 9 is connected with a fixed cold water pump 5, the outlet of the absorption heat pump evaporator 9 is sequentially connected with a fixed cold water cooler 6 and a generator 1, and the fixed cold water outlet of the generator 1 is connected to the inlet of the fixed cold water pump 5.

A hot water circulating pump 16 is arranged between the heating and ventilation water collector 2 and the absorption heat pump absorber 10.

A solution pump 15 is arranged in a pipeline from the absorption heat pump absorber 10 to the absorption heat pump generator 7 in a solution process; a pressure reducing valve 14 is arranged in the solution return path from the absorption heat pump generator 7 to the absorption heat pump absorber 10.

And an expansion valve 13 is arranged between a working medium outlet of the absorption heat pump condenser 8 and a working medium pipeline of the absorption heat pump evaporator 9.

The heat source inlet of the absorption heat pump generator 7 is connected with a flow regulating valve 17, the heat source outlet of the absorption heat pump generator 7 is connected with an automatic steam trap 18, and the output end of the automatic steam trap 18 is connected with a steam condenser draining flash tank 19.

And a heating and ventilation steam-water heat exchanger 12 is arranged between the absorption heat pump condenser 8 and the heating and ventilation water separator 3 through a pipeline, and the heating and ventilation steam-water heat exchanger and the heating and ventilation water separator are arranged in series.

The outlet pipeline of the absorption heat pump evaporator 9 and the fixed cold water cooler 6 are arranged in series.

And an inlet pipeline of the fixed cold water pump 5 is provided with an expansion water tank 4, and a fixed cold water system is in closed circulation.

The use method of the generator stator cooling water waste heat utilization device comprises the following steps;

when the heat pump device is started, the heat supply backwater and the constant cooling water system of a plant area are firstly put into operation, and then the flow regulating valve 17 is opened; after the temperature of the heating water rises, controlling the opening degree of the heating ventilation steam-water heat exchanger 12 to reduce, and keeping the inlet water temperature of the heating ventilation water separator 3 constant; after the temperature of the stator cooling water is reduced, the stator cooling water cooler 6 is gradually controlled to quit the operation, and the water inlet temperature of the generator is kept constant; the heat pump device takes the water inlet temperature of the generator as the primary control quantity, and the steam quantity is adjusted through the flow regulating valve 17 to ensure that the constant-cooling water maintains the required operating temperature of the generator. When the temperature of the heating water can not meet the heating requirement, the compensation is carried out through the heating ventilation steam-water heat exchanger 12.

The invention has the beneficial effects that:

1. the energy-saving effect is good. The invention utilizes the absorption heat pump to take away the heat of the stator cooling water, reduces the cooling water flow of the stator cooling water cooler, and reduces the plant power consumption. Meanwhile, under the condition that the temperature of the heating water is not changed, the consumption of auxiliary steam is reduced, and the operation efficiency of the unit is improved.

2. The operation reliability is strong. The invention designs a fixed cold water cooler and a heating and ventilating steam-water heat exchanger which are respectively connected with an absorption heat pump evaporator and a condenser in series, and the device can be rapidly put into operation when the absorption heat pump and an auxiliary steam source system have faults, thereby ensuring the operation safety of a generator and the stability of heating load.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Wherein, 1 is a generator, 2 is a heating and ventilation water collector, 3 is a heating and ventilation water separator, 4 is an expansion water tank, 5 is a fixed cold water pump, 6 is a fixed cold water cooler, 7 is an absorption heat pump generator, 8 is an absorption heat pump condenser, 9 is an absorption heat pump evaporator, 10 is an absorption heat pump absorber, 11 is a solution heat exchanger, 12 is a heating and ventilation steam-water heat exchanger, 13 is an expansion valve, 14 is a pressure reducing valve, 15 is a solution pump, 16 is a hot water circulating pump, 17 is a flow regulating valve, 18 is an automatic steam trap, and 19 is a steam trap flash tank.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the device and method for utilizing the waste heat of the cooling water of the stator of the generator according to the present invention includes a generator 1, a heating and ventilation water collector 2, a heating and ventilation water separator 3, a heating and ventilation steam-water heat exchanger 12, a fixed-cold water cooler 6, an absorption heat pump generator 7, an absorption heat pump condenser 8, an absorption heat pump evaporator 9, and an absorption heat pump absorber 10;

after the plant heating backwater is collected to the heating and ventilation water collector 2, the plant heating backwater is connected to a hot water inlet of an absorption heat pump absorber 10 through a hot water circulating pump 16, a hot water outlet of the absorption heat pump absorber 10 is connected to a hot water inlet of an absorption heat pump condenser 8, a hot water outlet of the absorption heat pump condenser 8 is connected to a heating and ventilation steam-water heat exchanger 12, and finally the heating and ventilation water collector 3 is communicated. The plant heating backwater firstly absorbs the stator cooling water waste heat and the driving steam heat in the absorption heat pump, then the supplementary heating is carried out through the heating and ventilation steam-water heat exchanger 12 according to the heating demand, and the heating and ventilation steam-water heat exchanger 12 is also used as a standby heating means for keeping the heating system normally running during the shutdown period of the heat pump unit.

The generator stator cooling water enters the absorption heat pump evaporator 9 after being pressurized by the fixed cold water pump 5, heat is released in the absorption heat pump evaporator 9, the outlet of the absorption heat pump evaporator 9 is sequentially connected with the fixed cold water cooler 6 and the generator 1, and the fixed cold water outlet of the generator 1 is connected to the inlet of the fixed cold water pump 5. The constant cold water cooler 6 is used as a standby cooler, and the constant cold water temperature is adjusted when the absorption heat pump stops running.

Auxiliary steam is used as a driving steam source of the absorption heat pump, a steam source pipeline is connected to an auxiliary steam flow regulating valve 17 and then connected with a heat source inlet of an absorption heat pump generator 7, and a heat source outlet of the absorption heat pump generator 7 is connected to an automatic steam trap 18 and then communicated with a steam trap drainage flash tank 19.

The absorption heat pump generator 7, the absorption heat pump condenser 8, the absorption heat pump evaporator 9 and the absorption heat pump absorber 10 form an absorption heat pump main body, wherein an expansion valve 13 is arranged at a working medium outlet of the absorption heat pump condenser 8 and a working medium pipeline of the absorption heat pump evaporator 9; a solution pump 15 is arranged in a solution process pipeline from the absorption heat pump absorber 10 to the absorption heat pump generator 7; a pressure reducing valve 14 is arranged in a solution return stroke from the absorption heat pump generator 7 to the absorption heat pump absorber 10; a solution heat exchanger 11 is arranged between the inlet pipeline and the return pipeline for heat exchange.

Further, the absorption heat pump condenser 8 and the heating and ventilation steam-water heat exchanger 12 are arranged in series, and the absorption heat pump evaporator 9 and the fixed cold water cooler 6 are arranged in series. An expansion water tank 4 is arranged on an inlet pipeline of the fixed cold water pump 5, and a fixed cold water system is in closed circulation.

The invention relates to a method for utilizing the waste heat of cooling water of a generator stator, which comprises the following steps of:

when the heat pump device is started, the heat supply backwater and the constant cooling water system of a plant area are firstly put into operation, and then the flow regulating valve 17 is opened; after the temperature of the heating water rises, controlling the opening degree of the heating ventilation steam-water heat exchanger 12 to reduce, and keeping the inlet water temperature of the heating ventilation water separator 3 constant; after the temperature of the stator cooling water is reduced, the stator cooling water cooler 6 is gradually controlled to quit the operation, and the water inlet temperature of the generator is kept constant; the heat pump device takes the water inlet temperature of the generator as the primary control quantity, and the steam quantity is adjusted through the flow regulating valve 17 to ensure that the constant-cooling water maintains the required operating temperature of the generator. When the temperature of the heating water can not meet the heating requirement, the compensation is carried out through the heating ventilation steam-water heat exchanger 12.