CN211781371U

CN211781371U - Heat pump heating system using desulfurization circulating slurry and steam turbine exhaust steam as heat sources

Info

Publication number: CN211781371U
Application number: CN201921933126.9U
Authority: CN
Inventors: 陈衡; 邸树帅; 郑福豪; 徐钢; 雷兢
Original assignee: North China Electric Power University
Current assignee: North China Electric Power University
Priority date: 2019-11-11
Filing date: 2019-11-11
Publication date: 2020-10-27
Anticipated expiration: 2029-11-11

Abstract

The utility model discloses an use heat pump heating system of desulfurization circulation thick liquid and steam turbine exhaust steam as heat source who belongs to heat supply technical field. The system mainly comprises a wet flue gas desulfurization device, a steam turbine system, a heat pump system, a heat supply network heating system and the like. The system extracts steam from a communicating pipe between the medium and low pressure cylinders, the steam enters the heat pump generator to heat dilute solution, the generated steam enters the condenser to release heat, and the heat is condensed into water after being released, and the water enters the evaporator. The heat source in the evaporator is desulfurization circulating slurry and steam turbine exhaust steam, and the water vapor generated in the evaporator is mixed with the concentrated solution to release heat. The heat supply network circulating water absorbs heat in the absorber and the condenser, and then supplies heat to heat users. The utility model discloses a heat in desulfurization circulation thick liquid and the steam turbine exhaust steam has been retrieved to the heat pump, has reduced the temperature of desulfurization circulation thick liquid simultaneously, and then makes wet flue gas desulfurization device outlet temperature reduce, reduces the moisture in the flue gas, can alleviate the white smoke phenomenon of chimney export.

Description

Heat pump heating system using desulfurization circulating slurry and steam turbine exhaust steam as heat sources

Technical Field

The utility model belongs to the technical field of the heat supply, in particular to use heat pump heating system of desulfurization circulation thick liquid and steam turbine exhaust steam as the heat source.

Background

In recent years, most of thermal power plants in coastal areas in northern China develop cogeneration to reduce power supply coal consumption. The production mode of cogeneration conforms to the principle of energy cascade utilization. In northern areas of China, the method of bulk coal burning is mostly adopted for heating in winter, the pollution is great, the efficiency is low, and the pollution problem can be effectively treated by changing the central heating mode. According to the basic concept and the thirteen-five plan of ecological civilization construction in China, the total energy consumption is controlled within 50 hundred million tons of standard coal in 2020, the total emission of pollutants such as sulfur dioxide, nitrogen oxide and the like is reduced by more than 10% compared with that in 2015, and the aim of reducing the carbon emission of single GDP by 4000-4500 on the basis of 2005 is strived. Therefore, the energy conservation and emission reduction has very important significance for the long-term development of energy and environment in China and even the world.

There is room for further optimization with respect to the current cogeneration production mode of power plants. At present, most of thermal power plants in China adopt steam of a communicating pipe between medium and low pressure cylinders to directly supply heat. A lot of low-level energy in the power plant is wasted, for example, the waste steam heat of a steam turbine is absorbed by cooling water in a condenser, and then the cooling water is discharged; the desulfurization slurry in the wet flue gas desulfurization device in the boiler absorbs the heat of the flue gas and directly dissipates the heat. If the part of energy is recycled and used for heat supply, the energy utilization efficiency of cogeneration is greatly improved, and the aims of saving energy and reducing consumption are fulfilled.

The utility model discloses in, the heat of desulfurization circulation thick liquid and the heat of steam turbine exhaust steam have been retrieved to the heat pump to be used for this part heat supply, very big improvement combined heat and power's energy utilization efficiency, for the transformation of each power plant provides the reference meaning in the future, and because of the heat of desulfurization circulation thick liquid is retrieved, reduced the temperature of desulfurization circulation thick liquid, and then make wet flue gas desulfurization device exit temperature reduce, reduce the moisture in the flue gas, can alleviate the white smoke phenomenon of chimney export.

SUMMERY OF THE UTILITY MODEL

The utility model aims at the problem that need take out a large amount of steam winter to carry out heating to the power plant in china north at present many low-order energies in the problem and the power plant that are directly wasted, retrieve the heat of desulfurization circulation thick liquid and the heat of steam turbine exhaust steam through the heat pump to the heat supply, the exhaust steam condensation returns the condensate tank for the condensate water, and thick liquid and heat medium heat transfer after-temperature reduce. On one hand, the energy utilization efficiency of cogeneration is effectively improved, and the aims of energy conservation and consumption reduction are fulfilled; on the other hand, the temperature of the desulfurization circulating slurry is reduced, so that the outlet temperature of the wet desulfurization device is reduced, the moisture in the flue gas is reduced, and the white smoke phenomenon at the outlet of the chimney can be reduced.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a heat pump heating system taking desulfurization circulating slurry and steam turbine exhaust steam as heat sources mainly comprises a steam turbine high pressure cylinder, a steam turbine medium pressure cylinder, a steam turbine low pressure cylinder, a wet flue gas desulfurization device, an evaporator, an absorber, a condenser, a generator and a heat supply network heating system; the device is characterized in that three cylinders, namely a steam turbine high-pressure cylinder, a steam turbine intermediate-pressure cylinder and a steam turbine low-pressure cylinder, are sequentially connected, a steam extraction pipeline is arranged on a communicating pipe between the intermediate-pressure cylinder and the low-pressure cylinder, steam is extracted to enter a generator to heat a dilute solution to generate steam and a concentrated solution, the concentrated solution enters an absorber to absorb the steam generated by an evaporator, and the dilute solution returns to the generator to form working medium circulation; the exhaust steam of the steam turbine enters an evaporator for heat release, and the drained water after heat release returns to a condensation water tank; the heat of the desulfurization circulating slurry in the wet flue gas desulfurization device is transferred to a heat medium, the heat medium absorbing heat enters an evaporator to release heat, and the heat medium releasing heat returns to the wet flue gas desulfurization device to form circulation; the heat supply network circulating water absorbs heat in the absorber and the condenser, then enters the heat supply network heating system to release heat, and hot water after heat release returns to the absorber to form circulation.

The heat pump has two heat sources of the evaporator, one is circulating slurry in the wet flue gas desulfurization device, and the heat medium absorbs heat from the slurry with higher temperature and then releases heat in the evaporator; the other heat source is the exhaust steam of a steam turbine, the exhaust steam directly enters an evaporator to release heat, and the condensed water returns to a condensation water tank.

The working steam in the heat pump generator is extracted by a communicating pipe between the low pressure cylinder and the medium pressure cylinder of the steam turbine, the pressure is about 0.3MPa, and no separate equipment is needed for producing the working steam.

The utility model has the advantages of it is following and beneficial effect:

the heat of the desulfurization circulating slurry and the heat of the exhaust steam of the steam turbine are recovered by the heat pump, so that the energy is saved, the energy utilization efficiency of cogeneration is effectively improved, and the aims of saving energy and reducing consumption are fulfilled; the temperature of the desulfurization circulating slurry is reduced, so that the outlet temperature of the wet desulfurization device is reduced, the moisture in the flue gas is reduced, and the white smoke phenomenon at the outlet of a chimney can be reduced.

Drawings

FIG. 1 is a heat pump heating system diagram with desulfurization circulating slurry and steam turbine exhaust steam as heat sources: 1-a high-pressure cylinder of a steam turbine; 2-a steam turbine intermediate pressure cylinder; 3-low pressure cylinder of steam turbine; 4-a wet flue gas desulfurization device; 5-an evaporator; 6-an absorber; 7-a condenser; 8-a generator; 9-heat supply network heating system.

Detailed Description

The utility model provides a heat pump heating system using desulfurization circulating slurry and steam turbine exhaust steam as heat sources, and the working principle of the system is further explained by combining the attached drawings and the specific implementation mode.

A heat pump heating system taking desulfurization circulating slurry and steam turbine exhaust steam as heat sources mainly comprises a steam turbine high-pressure cylinder (1), a steam turbine medium-pressure cylinder (2), a steam turbine low-pressure cylinder (3), a wet flue gas desulfurization device (4), an evaporator (5), an absorber (6), a condenser (7), a generator (8) and a heat supply network heating system (9); the device is characterized in that three cylinders, namely a steam turbine high-pressure cylinder (1), a steam turbine intermediate-pressure cylinder (2) and a steam turbine low-pressure cylinder (3), are sequentially connected, a steam extraction pipeline is arranged on a communicating pipe between the intermediate-pressure cylinder and the low-pressure cylinder, steam is extracted into a generator (8) to heat dilute solution to generate steam and concentrated solution, the concentrated solution enters an absorber (6) to absorb the steam generated by an evaporator (5), and the dilute solution returns to the generator (8) to form working medium circulation; the exhaust steam of the steam turbine enters an evaporator (5) to release heat, and the drained water after heat release returns to a condensation water tank; the heat is transferred to a heat medium by the desulfurization circulating slurry in the wet flue gas desulfurization device (4), the heat medium absorbing the heat enters the evaporator (5) to release the heat, and the heat medium releasing the heat returns to the wet flue gas desulfurization device (4) to form circulation; the heat supply network circulating water absorbs heat in the absorber (6) and the condenser (7), then enters the heat supply network heating system (9) to release heat, and hot water after heat release returns to the absorber (6) to form circulation.

The heat source of the evaporator (5) in the heat pump is two, one is circulating slurry in the wet flue gas desulfurization device (4), and the heat medium absorbs heat from the slurry with higher temperature and releases heat in the evaporator (5); the other heat source is the exhaust steam of a steam turbine, the exhaust steam directly enters the evaporator (5) to release heat, and the condensed water returns to the condensation water tank.

The working steam in the heat pump generator (8) is extracted by a communicating pipe between the low pressure cylinders in the steam turbine, the pressure is about 0.3MPa, and no separate equipment is needed for producing the working steam.

The above-mentioned embodiment is not the limit of the present invention, and the technical personnel in the technical field are in the utility model discloses a change, modification, addition or replacement that technical scheme within range made also all belong to the protection scope of the utility model.

Claims

1. A heat pump heating system taking desulfurization circulating slurry and steam turbine exhaust steam as heat sources mainly comprises a steam turbine high-pressure cylinder (1), a steam turbine medium-pressure cylinder (2), a steam turbine low-pressure cylinder (3), a wet flue gas desulfurization device (4), an evaporator (5), an absorber (6), a condenser (7), a generator (8) and a heat supply network heating system (9); the device is characterized in that three cylinders, namely a steam turbine high-pressure cylinder (1), a steam turbine intermediate-pressure cylinder (2) and a steam turbine low-pressure cylinder (3), are sequentially connected, a steam extraction pipeline is arranged on a communicating pipe between the intermediate-pressure cylinder and the low-pressure cylinder, steam is extracted into a generator (8) to heat dilute solution to generate steam and concentrated solution, the concentrated solution enters an absorber (6) to absorb the steam generated by an evaporator (5), and the dilute solution returns to the generator (8) to form working medium circulation; the exhaust steam of the steam turbine enters an evaporator (5) to release heat, and the drained water after heat release returns to a condensation water tank; the heat is transferred to a heat medium by the desulfurization circulating slurry in the wet flue gas desulfurization device (4), the heat medium absorbing the heat enters the evaporator (5) to release the heat, and the heat medium releasing the heat returns to the wet flue gas desulfurization device (4) to form circulation; the heat supply network circulating water absorbs heat in the absorber (6) and the condenser (7), then enters the heat supply network heating system (9) to release heat, and hot water after heat release returns to the absorber (6) to form circulation.

2. The heat pump heating system using the desulfurization circulating slurry and the steam turbine exhaust steam as heat sources according to claim 1, wherein the heat source of the evaporator (5) in the heat pump is two, one is the circulating slurry in the wet flue gas desulfurization device (4), and the heat medium absorbs heat from the slurry with higher temperature and releases heat in the evaporator (5); the other heat source is the exhaust steam of a steam turbine, the exhaust steam directly enters the evaporator (5) to release heat, and the condensed water returns to the condensation water tank.

3. The heat pump heating system using the desulfurization circulating slurry and the exhaust steam of the steam turbine as heat sources according to claim 1, wherein the working steam in the heat pump generator (8) is extracted by a communicating pipe between the low pressure cylinder and the medium pressure cylinder of the steam turbine at a pressure of about 0.3MPa without a separate device for producing the working steam.