CN102997311B - Power plant condensing heat recovery heat supply system - Google Patents

Abstract

The invention relates to a heat recovery device, and discloses a power plant condensing heat recovery heat supply system which comprises a steam pipeline, a circulating cooling water pipeline and an internal circulating pipeline. The power plant condensing heat recovery is characterized by further comprising a heat supply pipeline, and the heat supply pipeline comprises a heat user terminal, and condensing heat returns to the heat user terminal through water return pipelines after passing through a water-water heat exchanger. The heat recovery device achieves condensing heat recovery by the heat exchange manner of an absorption heat pump, recovers power plant condensing heat, and waste heat in circulating cooling water, and uses the condensing heat and the waste heat for production and life heat supply, and therefore has the advantages of being high in heat energy recovery utilization rate, energy-saving and environment-protective and the like.

Description

Power plant condensation heat recovery heating system

technical field

The invention relates to a waste heat recovery device of a power plant, in particular to a power plant condensation heat recovery heating system.

Background technique

The condensation heat of thermal power plants is discharged into the atmosphere through cooling towers or air-cooled islands, resulting in huge heat loss, which is the main reason for the low efficiency of energy use in thermal power plants. It not only causes a lot of waste of energy and water or electricity, but also seriously pollutes the atmosphere. . The evacuation of condensation heat in thermal power plants is a common problem in our country and even in the world. It is a waste and helpless. However, with the development of heat pump technology, especially the advent of large-scale high-temperature water source heat pumps, it will become possible to recover the condensed waste heat of generating units.

Contents of the invention

Aiming at the problem that condensation waste heat is difficult to recover and utilize in the prior art, the invention provides a heat supply system that adopts heat pump technology to recover the condensation heat of a power plant.

In order to solve the above technical problems, the present invention is solved through the following technical solutions:

A power plant condensation heat recovery heating system, including steam pipelines, circulating cooling water pipelines, internal circulation pipelines, and heat supply pipelines. The heat supply pipelines include heat user terminals, and the heat supply pipelines After passing through the water-to-water heat exchanger, the water returns to the heat user terminal through the return water pipeline. The circulating cooling water of the power plant contains a large amount of waste heat. The heat supply pipeline recovers the waste heat in the circulating cooling water of the power plant through an absorption heat pump and a water-to-water heat exchanger, and then transports it to the heat user end to realize waste heat recovery and heat supply.

As a preference, the power plant condensation heat recovery heating system further includes a steam-water heat exchange pipeline, and the steam-water heat exchange pipeline is provided with a steam-water heat exchanger, which is formed into condensed water and discharged after being absorbed by the absorption heat pump.

Preferably, the heat supply pipeline (secondary heat network) is provided with a heat supply circulation pump, and the circulation pump is arranged between the water-to-water heat exchanger and the heat user terminal. Through the power of the heat supply circulation pump, the water in the heat supply pipeline is circulated, and the heat is delivered to the end user.

As a preference, the steam pipeline works through the steam turbine, and the exhaust steam discharged from the turbine is transported to the condenser, and the exhaust steam passes through the condenser to transfer heat energy to the cooling water in the circulating cooling water pipeline, and then the condensate is discharged.

As a preference, the circulating cooling water pipeline returns to the cooling circulating pump through the cooling circulating pump, the condenser, and the absorption heat pump to form a loop, thereby eliminating the need for the circulating cooling water to be sent to the cooling tower to discharge waste heat to the environment. The heat energy in the circulating cooling water pipeline is transferred to the heating pipeline through the absorption heat pump, which improves the utilization rate of heat energy and achieves the purpose of energy saving and emission reduction.

Preferably, the internal circulation pipeline (primary heat network) passes through an absorption heat pump and a water-to-water heat exchanger. The internal circulation pipeline conducts heat exchange through the absorption heat pump and the steam-water heat exchanger on the circulating cooling water pipeline to increase the temperature of the primary heat network, and then transfers the obtained heat energy to the secondary heat network through the water-water heat exchanger in the form of heat exchange. Heat pipes to deliver heat to end heat users.

Preferably, an internal circulation pump is provided on the internal circulation pipeline, and the internal circulation pump is located between the absorption heat pump and the water-to-water heat exchanger. Through the power of the internal circulation pump, the water in the internal circulation pipeline is circulated.

Preferably, the steam-water heat exchange pipeline is further provided with a control valve, and the control valve is located between the steam turbine and the steam-water heat exchanger. The heat supply can be controlled through the adjustment of the control valve. For different weather conditions, the opening of the control valve can be changed to keep the user temperature constant.

The invention realizes condensation heat recovery through the heat exchange mode of the absorption heat pump, recovers the condensation heat of the power plant and the waste heat in the circulating cooling water, and has the advantages of high heat energy recovery utilization rate, energy saving and emission reduction, and the like.

Description of drawings

Fig. 1 is a schematic structural diagram of Embodiment 1 of the present invention.

Among them: 1-steam pipeline, 2-circulating cooling water pipeline, 3-steam-water heat exchange pipeline, 4-internal circulation pipeline, 5-heat supply pipeline, 6-steam-water heat exchanger, 7-absorption heat pump, 9-water-to-water heat exchanger, 11-steam turbine, 12-condenser, 21-cooling circulation pump, 31-control valve, 41-internal circulation pump, 10-heating user terminal, 51-heating circulation pump.

detailed description

Below in conjunction with accompanying drawing 1 and specific embodiment the present invention is described in further detail:

A power plant condensation heat recovery heating system, as shown in FIG.

The steam-water heat exchange pipeline 3 is provided with a steam-water heat exchanger 6 and connected to an absorption heat pump 7. After the steam in the steam-water heat exchange pipeline 3 is absorbed by the absorption heat pump 7, it forms condensed water and is discharged. The steam-water heat exchange pipeline 3 passes through the steam-water heat exchanger 6 for partial heat release to increase the water temperature of the internal circulation pipeline (primary heat network) 4, and then sends it to the absorption heat pump 7 as the driving heat source of the absorption heat pump 7, and the absorption heat pump 7 Recover the waste heat of the circulating cooling water from the condenser and provide it to the internal circulation pipeline 4 after heating up.

The steam-water heat exchange pipeline 3 is also provided with a control valve 31 , and the control valve 31 is located between the steam turbine 11 and the steam-water heat exchanger 6 . The heat supply can be controlled through the adjustment of the control valve 31. For different weather conditions, the opening degree of the control valve 31 can be changed to keep the user temperature constant. The steam-water heat exchange pipeline 3 increases the water temperature of the primary heating network through the steam-water heat exchanger 6, and then connects to the absorption heat pump 7 as the heat source of the absorption heat pump 7 to release heat, and then through the function of the circulation pump 51, the absorption heat pump 7 Recover the waste heat in the circulating cooling water and provide it to heat users.

The steam in the steam pipeline 1 is sent to the steam turbine 11 to do work, and the exhaust steam discharged from the steam turbine 11 is sent to the condenser 12, and the exhaust steam passes through the condenser 12 to transfer heat energy to the cooling water in the circulating cooling water pipeline 2 Then condense into water and discharge.

The circulating cooling water pipeline 2 returns to the cooling circulating pump 21 after passing through the cooling circulating pump 21, the condenser 12 and the absorption heat pump 7, forming a loop. The cooling water with heat energy passes through the absorption heat pump 7 and extracts the waste heat energy in the absorption heat pump 7 for heat exchange with the internal circulation pipeline 4, and the internal circulation pipeline 4 transfers heat energy to the heat supply pipe through the water-to-water heat exchanger 9 Road 5.

This embodiment also includes that the internal circulation pipeline 4 is a primary heating network, and the internal circulation pipeline 4 passes through an absorption heat pump 7 , a steam-water heat exchanger 6 and a water-water heat exchanger 9 . The internal circulation pipeline 4 performs heat exchange through the absorption heat pump 7 on the circulating cooling water pipeline 2 and the steam-water heat exchanger 6 to obtain heat energy, and then transfers the obtained heat energy to the heat supply through the water-water heat exchanger 9 in the form of heat exchange. Pipeline 5. An internal circulation pump 41 is provided on the internal circulation pipeline 4 , and the internal circulation pump 41 is arranged between the absorption heat pump 7 and the water-to-water heat exchanger 9 . The water in the internal circulation pipeline 4 passes through the absorption heat pump 7 to obtain heat energy, and the temperature rises to 90°C. At this time, the water temperature is further raised to above 105°C through the steam-water heat exchanger 6, and then released through the water-water heat exchanger 9 After thermal energy the temperature drops below 53°C.

The power plant condensation heat recovery heating system also includes a heat supply pipeline 5 as a secondary heating network, and the heat supply pipeline 5 includes a heat user terminal 10, and the water in the heat supply pipeline 5 undergoes water-to-water heat exchange After the device 9 returns to the hot user terminal 10 through the water return pipeline.

The heat supply pipeline 5 is further provided with a circulation pump 51 , and the circulation pump 51 is arranged between the water-to-water heat exchanger 9 and the heat user terminal 10 . The water in the heating pipeline 5 is circulated by the power of the circulating pump 51 . The heat energy in the heat supply pipeline 5 is obtained through the water-to-water heat exchanger 9 . After the heating pipeline 5 passes through the water-to-water heat exchanger 9, the water temperature in the heating pipeline 5 rises above 70°C, and then enters the heat user terminal 10 for heating, and after passing through the heat user terminal 10, the water temperature drops to 50°C. ℃, and then due to the function of the circulation pump 51, it circulates to the water-water heat exchanger 9 for reheating, so as to achieve the purpose of using the waste heat in the cooling water of the power plant to recover heat, and the waste heat of the circulating cooling water is recycled by the absorption heat pump 7 Recycling is realized, and the condensation heat of the power plant is recovered and used for production and domestic heating. It has the advantages of high heat recovery and utilization rate, energy saving and emission reduction.

The power plant condensation heat recovery heating system provided by the present invention has been introduced in detail above. For those of ordinary skill in the art, based on the ideas of the embodiments of the present invention, there will be changes in the specific implementation and application range. Make corresponding changes according to actual needs. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims (5)

1. A power plant condensation heat recovery heating system, comprising a steam pipeline (1), a circulating cooling water pipeline (2), an internal circulation pipeline (4), characterized in that it also includes a heating pipeline (5), The heat supply pipeline (5) includes the heat user terminal (10), which is sent to the heat user terminal (10) through the water supply pipeline after passing through the water-water heat exchanger (9), and the internal circulation pipeline (4) is absorbed heat pump (7), steam-water heat exchanger (6) and water-water heat exchanger (9), and the internal circulation pipeline (4) obtains heat energy through heat exchange through the absorption heat pump on the circulating cooling water pipeline and the steam-water heat exchanger, Then, the obtained heat energy is transferred to the heat supply pipeline in the form of heat exchange through the water-to-water heat exchanger. It also includes a steam-water heat exchange pipeline (3), the steam-water heat exchange pipeline (3) is provided with a steam-water heat exchanger (6), and the steam in the steam-water heat exchange pipeline (3) passes through the steam-water heat exchanger (6 ) to perform partial heat release to increase the water temperature of the internal circulation pipeline (4), and then send it to the absorption heat pump (7) as the driving heat source of the absorption heat pump (7), after heat absorption by the absorption heat pump (7), form condensed water and discharge; The steam-water heat exchange pipeline (3) is also provided with a control valve (31), and the control valve (31) is located between the steam turbine (11) and the steam-water heat exchanger (6). 2. The power plant condensation heat recovery heating system according to claim 1, characterized in that: said heating pipeline (5) is provided with a heat supply circulation pump (51), and said heat supply circulation pump (51 ) is arranged between the water-to-water heat exchanger (9) and the heat user terminal (10). 3. The power plant condensation heat recovery heating system according to claim 1, characterized in that: the exhaust steam generated by the steam pipeline (1) after the steam turbine (11) does work is transported to the condenser (12), The exhaust steam passes through the condenser (12) to transfer heat energy to the cooling water in the cooling water circulation pipeline (2), and then becomes condensed water to be discharged. 4. The power plant condensation heat recovery heating system according to claim 1, characterized in that: the circulating cooling water pipeline (2) passes through a circulating cooling water pump (21), a condenser (12), an absorption heat pump ( 7) Get back to the circulating cooling water pump (21) later to form a loop. 5. The power plant condensation heat recovery heating system according to any one of claims 1 to 4, characterized in that: the internal circulation pipeline (4) is provided with an internal circulation pump (41), and the internal circulation The pump (41) is located between the absorption heat pump (7) and the water-to-water heat exchanger (9).