CN207019036U - The ultra-clean cold-heat combined system of discharge in coke-oven plant - Google Patents

Abstract

The utility model provides a cogeneration system for ultra-clean discharge of coking plants, including a denitrification device, a waste heat boiler, an absorption tower, and a regenerator. Waste heat, the flue gas of the waste heat boiler provides heat source for the absorption refrigeration unit through the heat exchanger, and the absorption tower and regenerator are used for deep desulfurization, dust removal and degassing of the flue gas. The ultra-clean emission cooling and heating cogeneration system of the coking plant, through the configuration of denitrification devices, waste heat boilers, absorption towers, regenerators and other devices, deeply recovers and efficiently utilizes the waste heat of the coking furnace flue gas, and simultaneously treats the flue gas in stages to achieve ultra-thin flue gas Net emissions to ensure annual energy saving and environmental protection benefits.

Description

Coking plant ultra-clean emission combined cooling and heating system

technical field

The utility model relates to an ultra-clean discharge cooling and heating combined production system in a coking plant.

Background technique

Energy is an important material basis for social development. The energy problems my country faces are mainly reflected in low energy utilization efficiency, poor economic benefits, rapid growth in energy consumption, and obvious pressure on the ecological environment. In the "Eleventh Five-Year" development plan, the country clearly stated that energy conservation and emission reduction should be regarded as a long-term strategic task. In the follow-up development plan, energy conservation and emission reduction indicators should be continuously improved and quantified, and financial investment should be increased.

The coke oven is a high-efficiency thermal equipment in the energy conversion device, with a net efficiency as high as 87% to 89%. This is because the coking process is not only a relatively complete energy conversion process that can produce high-quality secondary energy, but also the coke oven itself has been continuously improved for more than 100 years, and has excellent performance in gas combustion, flue gas heat utilization, and heat insulation. more perfect. But this does not mean that it has no room for energy saving.

Efficient recovery and utilization of waste heat resources generated in the coking process is the main direction and potential of energy conservation in resource-saving and environmentally friendly green coking plants, and it is also one of the main ways to improve efficiency. At present, the existing energy-saving measures mainly include: 1. Fully recycle and utilize the output heat of coke ovens; 2. In-depth promotion of CDQ technology and fully recycle and utilize red coke waste heat; 3. Research and development of waste gas waste heat recovery and utilization; 4. Coke oven Recycling of flue gas waste heat.

The above measures are all from a certain aspect, the waste heat recovery of the coking oven has been studied, and the optimal allocation of energy in the coking plant has not been studied in depth, so the maximum and comprehensive energy saving cannot be realized. In addition, existing energy-saving measures lack research on environmental protection, and current environmental protection products often increase energy consumption and do not have energy-saving features.

Utility model content

The technical problem to be solved by the utility model is to provide an ultra-clean emission combined cooling and heating system for a coking plant to overcome the defects of low energy saving efficiency and no environmental protection effect of the coke oven waste heat recovery measures in the prior art.

The utility model solves the above technical problems through the following technical solutions:

The utility model provides an ultra-clean discharge cooling and heating cogeneration system in a coking plant, comprising:

A denitration device, the denitration device has a denitration flue gas inlet and a denitration flue gas outlet, and the flue gas enters the denitration device from the denitration flue gas inlet and is discharged from the denitration flue gas outlet;

Waste heat boiler, the waste heat boiler has a boiler flue gas inlet, a boiler flue gas outlet, a boiler cold source inlet, and a boiler cold source outlet, and the boiler flue gas inlet and boiler flue gas outlet are connected through boiler flue gas pipes, so The inlet of the boiler cold source and the outlet of the boiler cold source are connected through the boiler cold source pipeline, the flue gas in the boiler flue gas pipeline exchanges heat with the working medium in the boiler cold source pipeline, and the boiler flue gas inlet and The denitrification flue gas outlet is connected;

An absorption tower, the absorption tower has an absorption tower flue gas inlet, an absorption tower flue gas outlet, an absorption tower solution inlet, and an absorption tower solution outlet, the absorption tower flue gas inlet is connected with the boiler flue gas outlet, and the absorption tower The flue gas inlet of the absorption tower is located at the lower part of the absorption tower and discharges the flue gas into the interior of the absorption tower, the flue gas outlet of the absorption tower is located at the upper part of the absorption tower and discharges the flue gas to the outside, the The absorption tower solution inlet is located at the upper part of the absorption tower and sprays the hygroscopic solution into the absorption tower, and the absorption tower solution outlet is located at the lower part of the absorption tower and discharges the hygroscopic solution;

A regenerator, the regenerator has a regenerator solution inlet, a regenerator solution outlet, and a secondary steam outlet, the regenerator solution inlet is connected to the absorption tower solution outlet, and the regenerator solution outlet is connected to the absorption tower The solution inlet is connected, and the secondary steam outlet discharges the secondary steam generated by heating and evaporating the hygroscopic solution.

Preferably, the ultra-clean emission cogeneration system of the coking plant further includes at least one heat exchanger, and the boiler flue gas outlet and/or the secondary steam outlet are connected to at least one of the heat exchangers and heat exchange.

Preferably, the absorption tower also has an absorption tower cold source inlet and an absorption tower cold source outlet, and the absorption tower cold source inlet and the absorption tower cold source outlet are connected through the absorption tower cold source pipeline, and the absorption tower The working fluid in the cold source pipeline exchanges heat with the working fluid inside the absorption tower.

Preferably, the cold source outlet of the absorption tower communicates with at least one heat exchanger for heat exchange.

Preferably, the regenerator also has a regenerator heat source inlet and a regenerator heat source outlet, and the regenerator heat source inlet and the regenerator heat source outlet are connected through a regenerator heat source pipeline, and the regenerator heat source pipeline The working fluid in the regenerator performs heat exchange with the working fluid inside the regenerator, and the heat source inlet of the regenerator is connected with the cold source outlet of the boiler.

Preferably, the heat source outlet of the regenerator communicates with at least one heat exchanger for heat exchange.

Preferably, the ultra-clean emission combined cooling and heating system of the coking plant further includes an absorption refrigerating unit, and the absorption refrigerating unit communicates with at least one of the heat exchangers for heat exchange.

Preferably, the ultra-clean emission combined cooling and heating system of the coking plant also includes:

The first heat exchanger, the first heat exchanger is located between the boiler flue gas outlet and the absorption tower flue gas inlet, the first heat exchanger has a first flue gas inlet and a first flue gas outlet , the first cold source inlet, the first cold source outlet, the first flue gas inlet and the first flue gas outlet are connected through the first flue gas pipe, the first cold source inlet, the first cold source outlet The flue gas in the first flue gas pipe exchanges heat with the working fluid in the first cold source pipe, and the boiler flue gas outlet and the first flue gas The gas inlet is connected, and the first flue gas outlet is connected with the flue gas inlet of the absorption tower;

The second heat exchanger, the second heat exchanger has a second cold source inlet, a second cold source outlet, a second heat source inlet, and a second heat source outlet, the second cold source inlet, the second cold source outlet The two are connected through the second cold source pipeline, the second heat source inlet and the second heat source outlet are connected through the second heat source pipeline, and the working medium in the second cold source pipeline is connected with the second heat source pipeline. The working medium is used for heat exchange, the second heat source inlet is connected with the secondary steam outlet, the second heat source outlet is connected with the external pipeline, the second cold source inlet, the second cold source outlet, The outlets of the first cold source are connected to each other;

The third heat exchanger, the third heat exchanger has a third cold source inlet, a third cold source outlet, a third heat source inlet, and a third heat source outlet, and the third cold source inlet and the third cold source outlet The third heat source inlet and the third heat source outlet are connected through the third heat source pipeline, and the working medium in the third heat source pipeline is connected with the third heat source pipeline. The working medium is used for heat exchange, the third heat source inlet is connected with the secondary steam outlet, the third heat source outlet is connected with the second heat source outlet, the third cold source inlet, the third cold source The source outlets are all in communication with the external pipeline.

Preferably, the absorption tower also has an absorption tower cold source inlet and an absorption tower cold source outlet, and the absorption tower cold source inlet and the absorption tower cold source outlet are connected through the absorption tower cold source pipeline, and the absorption tower The working fluid of the cold source pipeline exchanges heat with the internal working fluid of the absorption tower;

The regenerator also has a regenerator heat source inlet and a regenerator heat source outlet, and the regenerator heat source inlet and the regenerator heat source outlet are connected through a regenerator heat source pipeline, and the working fluid in the regenerator heat source pipeline and the The working fluid inside the regenerator performs heat exchange, and the heat source inlet of the regenerator is connected with the boiler cold source outlet;

The ultra-clean emission cogeneration system of the coking plant also includes a fourth heat exchanger, the fourth heat exchanger has a fourth cold source inlet, a fourth cold source outlet, a fourth heat source inlet, and a fourth heat source outlet, The fourth cold source inlet and the fourth cold source outlet are connected through a fourth cold source pipeline, the fourth heat source inlet and the fourth heat source outlet are connected through a fourth heat source pipeline, and the fourth cold source The working fluid in the source pipeline exchanges heat with the working medium in the fourth heat source pipeline, the inlet of the fourth heat source is connected with the heat source outlet of the regenerator, and the outlet of the fourth heat source is connected with the external pipeline The inlet of the fourth cold source is connected with the outlet of the absorption tower cold source, and the outlet of the fourth cold source is connected with the inlet of the third cold source.

Preferably, the ultra-clean emission combined cooling and heating system of the coking plant also includes an absorption refrigeration unit, and the absorption refrigeration unit has a heat source inlet of the refrigeration unit, a heat source outlet of the refrigeration unit, a chilled water inlet of the refrigeration unit, and a chilled water supply of the refrigeration unit. Outlet, the heat source inlet of the refrigeration unit and the heat source outlet of the refrigeration unit are connected through the heat source pipeline of the refrigeration unit, the chilled water inlet of the refrigeration unit and the chilled water outlet of the refrigeration unit are connected through a chilled water pipeline, and the inside of the chilled water pipeline The chilled water of the refrigeration unit exchanges heat with the working medium in the heat source pipeline of the refrigeration unit. The chilled water inlet of the refrigeration unit and the chilled water outlet of the refrigeration unit are connected to the external pipeline. The cold source outlet is connected, and the heat source outlet of the refrigerating unit is connected with the first cold source inlet.

Preferably, the ultra-clean emission cooling and heating cogeneration system of the coking plant also includes a denitration device, the denitration device has a denitration flue gas inlet and a denitration flue gas outlet, and the denitration flue gas outlet is connected to the boiler flue gas inlet The flue gas enters the denitration device from the denitration flue gas inlet and is discharged from the denitration flue gas outlet.

Preferably, the ultra-clean emission combined cooling and heating system of the coking plant further includes a heater, the heater includes a coke oven flue gas inlet, a coke oven flue gas outlet, a heating source inlet, and a heating source outlet, and the coke oven The flue gas inlet and the coke oven flue gas outlet are connected through a coke oven flue gas pipeline, the heating source inlet and the heating source outlet are connected through a heating source pipeline, and the flue gas in the coke oven flue gas pipeline is connected to the The working medium in the heating source pipeline performs heat exchange, and the coke oven flue gas outlet communicates with the denitration flue gas inlet.

On the basis of conforming to common knowledge in the field, the above-mentioned preferred conditions can be combined arbitrarily to obtain the preferred examples of the present utility model.

The positive progressive effect of the present utility model is:

The ultra-clean emission cooling and heating cogeneration system of the coking plant, through the configuration of waste heat boilers, absorption towers, regenerators and other devices, deeply recovers and efficiently utilizes the waste heat of coking furnace flue gas, and also has the environmental protection benefits of ultra-clean emission of flue gas, ensuring The annual energy saving and environmental protection benefits.

Description of drawings

Fig. 1 is a schematic diagram of an ultra-clean emission combined cooling and heating system of a coking plant of the present invention.

Explanation of reference signs

Waste heat boiler 1

Boiler flue gas inlet 11

Boiler flue gas outlet 12

Boiler cold source inlet 13

Boiler cold source outlet 14

Absorption tower 2

Absorption tower flue gas inlet 21

Absorption tower flue gas outlet 22

Absorption tower solution inlet 23

Absorption tower solution outlet 24

Absorption tower cold source inlet 25

Absorption tower cold source outlet 26

regenerator 3

Regenerator solution inlet 31

Regenerator solution outlet 32

Secondary steam outlet 33

Regenerator heat source inlet 34

Regenerator heat source outlet 35

Absorption refrigeration unit 4

Refrigeration unit heat source inlet 41

Refrigeration unit heat source outlet 42

Refrigeration unit chilled water inlet 43

Refrigeration unit chilled water outlet 44 first heat exchanger 5

The first flue gas inlet 51

The first flue gas outlet 52

The first cold source import 53

The first cold source outlet 54

Second heat exchanger 6

Second cold source inlet 61

Second cold source outlet 62

Second heat source inlet 63

Second heat source outlet 64

The third heat exchanger 7

The third cold source inlet 71

The third cold source outlet 72

The third heat source import 73

The third heat source outlet 74

Fourth heat exchanger 8

The fourth cold source import 81

The fourth cold source outlet 82

The fourth heat source import 83

The fourth heat source outlet 84

Denitration device 9

Denitrification flue gas inlet 91

Denitration flue gas outlet 92

Heater 10

Coke oven flue gas inlet 101

Coke oven flue gas outlet 102

Heating source import 103

Heating source outlet 104

detailed description

The utility model is further illustrated below by means of examples, but the utility model is not limited to the scope of the examples.

As shown in Figure 1, the ultra-clean exhaust cogeneration system of coking plant provided by the present invention includes a waste heat boiler 1, an absorption tower 2, and a regenerator 3, and the waste heat boiler 1 has a boiler flue gas inlet 11 and a boiler flue gas outlet 12. Boiler cold source inlet 13, boiler cold source outlet 14, boiler flue gas inlet 11, boiler flue gas outlet 12 are connected through boiler flue gas pipes, boiler cold source inlet 13, boiler cold source outlet 14 are connected through boiler The cold source pipeline is connected, and the flue gas in the boiler flue gas pipeline exchanges heat with the working medium in the boiler cold source pipeline; the absorption tower 2 has an absorption tower flue gas inlet 21, an absorption tower flue gas outlet 22, and an absorption tower solution inlet 23 , the absorption tower solution outlet 24, the absorption tower flue gas inlet 21 is connected with the boiler flue gas outlet 12, the absorption tower flue gas inlet 21 is located at the bottom of the absorption tower 2 and discharges the flue gas into the inside of the absorption tower 2, the absorption tower flue gas outlet 22 is located at the upper part of the absorption tower 2 and discharges flue gas to the outside, the absorption tower solution inlet 23 is located at the upper part of the absorption tower 2 and sprays the hygroscopic solution into the absorption tower 2, and the absorption tower solution outlet 24 is located at the lower part of the absorption tower 2 and discharges the hygroscopic solution Regenerator 3 has regenerator solution inlet 31, regenerator solution outlet 32, secondary steam outlet 33, regenerator solution inlet 31 is connected with absorption tower solution outlet 24, and regenerator solution outlet 32 is connected with absorption tower solution inlet 23 , the secondary steam outlet 33 discharges the secondary steam produced by heating and evaporating the hygroscopic solution.

After the waste heat boiler 1 recovers the waste heat of the coking furnace flue gas, the flue gas enters the absorption tower 2, and the waste heat of the flue gas is transferred to the working medium in the cold source pipeline of the boiler, such as heating water in winter, boiler water throughout the year, domestic water and Production water, etc. The flue gas enters the absorption tower 2 from the flue gas inlet 21 of the absorption tower, runs from bottom to top, and conducts heat and mass transfer countercurrently with the hygroscopic solution that enters from the solution inlet 23 of the absorption tower and falls from above. The hygroscopic solution plays a role in deep dust removal and degassing The role of sol. The flue gas is discharged from the system through the flue gas outlet 22 of the absorption tower. At this time, the waste heat of the discharged flue gas has been recovered and deeply purified by the hygroscopic solution, which realizes ultra-clean emission and waste heat recovery at the same time. After the hygroscopic solution passes through the flue gas, it absorbs the water vapor in the flue gas, and the concentrated solution is diluted into a dilute solution, which flows into the regenerator 3 from the solution outlet 24 of the absorption tower and the solution inlet 31 of the regenerator. The dilute solution is heated in the regenerator 3 and evaporates secondary steam, and the dilute solution becomes a concentrated solution again, and enters the absorption tower 2 from the solution outlet 32 of the regenerator and the solution inlet 23 of the absorption tower, realizing the circulation of the hygroscopic solution.

Waste heat boiler 1 adopts a finned tube-heat tube type waste heat boiler that combines finned tubes and heat pipes, that is, finned tubes are used for heat exchange above the dew point temperature (primary heat exchange), and heat pipes are used for parts prone to dew point corrosion temperature (secondary heat exchange) Secondary heat transfer), reasonable heat transfer design and wall temperature design can improve the heat transfer coefficient and solve the problem of low temperature dew point corrosion.

Before the flue gas enters the waste heat boiler 1, denitration treatment is required. Therefore, a denitrification device 9 is installed before the waste heat boiler 1, and the flue gas passes through the denitrification device 9 before entering the waste heat boiler 1. Specifically, the denitrification device 9 has a denitrification flue gas inlet 91 and a denitrification flue gas outlet 92. The denitrification flue gas outlet 92 is connected to the boiler flue gas inlet 11. The flue gas enters the denitrification device 9 from the denitrification flue gas The flue gas outlet 92 is discharged.

The flue gas needs to reach a higher temperature during the denitrification treatment. In order to ensure the denitrification effect, the flue gas needs to be heated in the heater 10 before entering the denitrification device 9 . Specifically, the heater 10 includes a coke oven flue gas inlet 101, a coke oven flue gas outlet 102, a heating source inlet 103, and a heating source outlet 104. The coke oven flue gas inlet 101 and the coke oven flue gas outlet 102 pass through the The flue gas pipes are connected, the heating source inlet 103 and the heating source outlet 104 are connected through the heating source pipes, the flue gas in the coke oven flue gas pipe exchanges heat with the working medium in the heating source pipe, and the coke oven flue gas outlet 102 communicates with the denitrification flue gas inlet 91. For energy saving and comprehensive utilization, waste heat of coking furnace raw gas can be used to heat the flue gas, that is, coking furnace raw gas enters the heating source pipeline from the heating source inlet 103, and is discharged from the heating source outlet 104, and the raw gas in the heating source pipeline and the coke oven The flue gas in the flue gas pipe conducts heat exchange to increase the temperature of the flue gas. The heater 10 can be a plate-fin heat exchanger, a heat pipe heat exchanger, or a plate heat exchanger.

The above-mentioned system can be equipped with multiple heat exchangers at various positions according to actual needs. For example, a heat exchanger can be installed between the boiler flue gas outlet 12 and the absorption tower flue gas inlet 21. For example, a heat exchanger can be installed at the secondary steam outlet 33. or multiple heat exchangers. The heat exchanger can be a plate-fin heat exchanger, a heat pipe heat exchanger, a plate heat exchanger, and the like.

The flue gas entering the absorption tower 2 only releases sensible heat. In fact, there is still latent heat of vaporization in the flue gas that can be recovered. In order to further improve the recovery rate of waste heat, heat exchange facilities can be installed in the absorption tower 2 to make the latent heat of the flue gas also be recycled. Specifically, the absorption tower 2 also has an absorption tower cold source inlet 25, an absorption tower cold source outlet 26, and the absorption tower cold source inlet 25 and the absorption tower cold source outlet 26 are connected through the absorption tower cold source pipeline, and the absorption tower cooling The working fluid in the source pipeline exchanges heat with the working fluid inside the absorption tower 2 . In addition to setting heat exchange facilities in the absorption tower 2, the cold source outlet 26 of the absorption tower can also be connected with one or more heat exchangers for heat exchange, so as to realize comprehensive recovery of waste heat.

At the same time, the hygroscopic solution enters the regenerator 3, and heat exchange facilities are also installed in the regenerator 3, so that the steam generated after heat exchange by the waste heat boiler 1 enters the regenerator 3 and exchanges heat with the solution in the regenerator 3. Specifically, the regenerator 3 also has a regenerator heat source inlet 34 and a regenerator heat source outlet 35. The regenerator heat source inlet 34 and the regenerator heat source outlet 35 are connected through a regenerator heat source pipeline. It exchanges heat with the working fluid inside the regenerator 3 , and the heat source inlet 34 of the regenerator communicates with the boiler cold source outlet 14 . In addition to setting heat exchange facilities in the regenerator 3, the heat source outlet 35 of the regenerator can also be connected with one or more heat exchangers for heat exchange, so as to realize all-round recovery of waste heat.

The steam produced by the waste heat boiler 1 is of high grade and can be directly used as the regeneration heat source of the regenerator 3. Therefore, connecting the heat source inlet 34 of the regenerator with the boiler cold source outlet 14 can further improve the energy utilization rate.

After being heated, the cold source of the heat exchanger can be used for heating water in winter, boiler water, domestic water and production water all year round. In addition, the heat exchanger can also be connected with the absorption refrigeration unit 4, which is mainly used to meet the cooling demand of the factory area in summer.

A kind of specific scheme of the combination of above-mentioned heat exchanger is as follows:

The ultra-clean emission cogeneration system of the coking plant includes the first heat exchanger 5, the second heat exchanger 6, and the third heat exchanger 7. The first heat exchanger 5 is located at the boiler flue gas outlet 12 and the absorption tower flue gas inlet Between 21, the first heat exchanger 5 has a first flue gas inlet 51, a first flue gas outlet 52, a first cold source inlet 53, a first cold source outlet 54, a first flue gas inlet 51, a first flue gas The outlets 52 are connected through the first flue gas pipe, the first cold source inlet 53 and the first cold source outlet 54 are connected through the first cold source pipe, and the flue gas in the first flue gas pipe is connected to the first cold source. The working medium in the source pipeline is heat-exchanged, the boiler flue gas outlet 12 is connected with the first flue gas inlet 51, and the first flue gas outlet 52 is connected with the absorption tower flue gas inlet 21;

The second heat exchanger 6 has a second cold source inlet 61, a second cold source outlet 62, a second heat source inlet 63, and a second heat source outlet 64, and the second cold source inlet 61 and the second cold source outlet 62 pass through the second The two cold source pipelines are connected, the second heat source inlet 63 and the second heat source outlet 64 are connected through the second heat source pipeline, the working fluid in the second cold source pipeline and the working fluid in the second heat source pipeline perform heat exchange, The second heat source inlet 63 is connected to the secondary steam outlet 33, the second heat source outlet 64 is connected to the external pipeline, and the second cold source inlet 61, the second cold source outlet 62, and the first cold source outlet 54 are connected to each other. ;

The third heat exchanger 7 has a third cold source inlet 71, a third cold source outlet 72, a third heat source inlet 73, and a third heat source outlet 74, and the third cold source inlet 71 and the third cold source outlet 72 pass through the third The three cold source pipelines are connected, the third heat source inlet 73 and the third heat source outlet 74 are connected through the third heat source pipeline, the working fluid in the third cold source pipeline and the working medium in the third heat source pipeline perform heat exchange, The third heat source inlet 73 communicates with the secondary steam outlet 33 , the third heat source outlet 74 communicates with the second heat source outlet 64 , the third cold source inlet 71 and the third cold source outlet 72 communicate with external pipelines.

Through the first heat exchanger 5, the second heat exchanger 6, and the third heat exchanger 7, the waste heat at the position of the boiler flue gas outlet 12 and the secondary steam outlet 33 is fully recovered, and the heat exchangers are mutually Connected, so that each heat exchanger is equipped with a bypass, increasing the safety of the system.

The fourth heat exchanger 8 is used to recover the heat in the absorption tower 2 and the regenerator 3. The fourth heat exchanger 8 has a fourth cold source inlet 81, a fourth cold source outlet 82, a fourth heat source inlet 83, and a fourth heat source. The outlet 84, the fourth cold source inlet 81, and the fourth cold source outlet 82 are connected through the fourth cold source pipeline, and the fourth heat source inlet 83 and the fourth heat source outlet 84 are connected through the fourth heat source pipeline. The working fluid in the cold source pipeline exchanges heat with the working fluid in the fourth heat source pipeline, the fourth heat source inlet 83 is connected with the heat source outlet 35 of the regenerator, the fourth heat source outlet 84 is connected with the external pipeline, and the fourth heat source The inlet 81 is connected with the outlet 26 of the absorption tower cold source, and the fourth cold source outlet 82 is connected with the third cold source inlet 71 .

Through the first heat exchanger 5, the second heat exchanger 6, the third heat exchanger 7, and the fourth heat exchanger 8, the coke oven flue gas waste heat can be efficiently recycled and other waste heat in the plant can be fully utilized without primary energy input. Realize the environmental benefits of ultra-low emission of flue gas, and ensure the benefits of energy saving and environmental protection throughout the year.

The absorption refrigerating unit 4 is connected with one or more of the heat exchangers mentioned above, which can meet the cooling requirements of the factory area in summer. A specific scheme of absorption refrigeration unit 4 is as follows: absorption refrigeration unit 4 has refrigeration unit heat source inlet 41, refrigeration unit heat source outlet 42, refrigeration unit chilled water inlet 43, refrigeration unit chilled water outlet 44, refrigeration unit heat source inlet 41, The heat source outlets 42 of the refrigeration unit are connected through the heat source pipeline of the refrigeration unit, the chilled water inlet 43 of the refrigeration unit and the chilled water outlet 44 of the refrigeration unit are connected through a chilled water pipeline, and the chilled water in the chilled water pipeline is connected with the heat source pipeline of the refrigeration unit. The working medium performs heat exchange, the chilled water inlet 43 of the refrigeration unit, the chilled water outlet 44 of the refrigeration unit are connected with external pipes, the heat source inlet 41 of the refrigeration unit is connected with the first cold source outlet 54, and the heat source outlet 42 of the refrigeration unit is connected with the first cold source The entrance 53 is connected. Actually, the absorption refrigerating unit 4 is not limited to communicate with the first heat exchanger 5 and the second heat exchanger 6, and may also communicate with other heat exchangers.

The utility model is not limited to the above-mentioned embodiments, and no matter any changes are made in its shape or structure, all fall within the protection scope of the utility model. The protection scope of the utility model is defined by the appended claims, and those skilled in the art can make various changes or modifications to these embodiments without departing from the principle and essence of the utility model, but these Changes and modifications all fall within the protection scope of the present utility model.

Claims (11)

1. A coking plant ultra-clean discharge combined cooling and heating system, characterized in that it comprises: A denitrification device (9), the denitrification device (9) has a denitrification flue gas inlet (91) and a denitrification flue gas outlet (92), and flue gas enters the denitrification device (9) from the denitrification flue gas inlet (91) and discharged from the denitrification flue gas outlet (92); The waste heat boiler (1), the waste heat boiler (1) has a boiler flue gas inlet (11), a boiler flue gas outlet (12), a boiler cold source inlet (13), a boiler cold source outlet (14), the boiler flue gas The gas inlet (11) and the boiler flue gas outlet (12) are connected through the boiler flue gas pipeline, and the boiler cold source inlet (13) and the boiler cold source outlet (14) are connected through the boiler cold source pipeline, The flue gas in the boiler flue gas pipeline is heat-exchanged with the working fluid in the boiler cold source pipeline, and the boiler flue gas inlet (11) is connected to the denitration flue gas outlet (92); Absorption tower (2), described absorption tower (2) has absorption tower flue gas inlet (21), absorption tower flue gas outlet (22), absorption tower solution inlet (23), absorption tower solution outlet (24), described The absorption tower flue gas inlet (21) is in communication with the boiler flue gas outlet (12), and the absorption tower flue gas inlet (21) is located at the bottom of the absorption tower (2) and discharges the flue gas into the The inside of the absorption tower (2), the absorption tower flue gas outlet (22) is located at the top of the absorption tower (2) and discharges the flue gas to the outside, and the absorption tower solution inlet (23) is located at the absorption tower (2) The top of the tower (2) and spray hygroscopic solution into the absorption tower (2), and the absorption tower solution outlet (24) is located at the bottom of the absorption tower (2) and discharges the hygroscopic solution; Regenerator (3), described regenerator (3) has regenerator solution inlet (31), regenerator solution outlet (32), secondary steam outlet (33), described regenerator solution inlet (31) and described The absorption tower solution outlet (24) is connected, and the regenerator solution outlet (32) is connected with the absorption tower solution inlet (23), and the secondary steam outlet (33) heats and evaporates the hygroscopic solution Secondary steam discharge. 2. The ultra-clean emission cogeneration system of coking plant as claimed in claim 1, characterized in that: the ultra-clean emission cogeneration system of coking plant also includes at least one heat exchanger, and the boiler flue gas outlet (12) and/or the secondary steam outlet (33) communicate with at least one heat exchanger and exchange heat. 3. The ultra-clean emission cogeneration system of coking plant as claimed in claim 1, characterized in that: the absorption tower (2) also has an absorption tower cold source inlet (25), an absorption tower cold source outlet (26) , the cold source inlet (25) of the absorption tower and the cold source outlet (26) of the absorption tower are connected through the cold source pipeline of the absorption tower, and the working medium in the cold source pipeline of the absorption tower is connected with the absorption tower (2) The internal working medium performs heat exchange. 4. The ultra-clean emission combined cooling and heating system of a coking plant according to claim 3, characterized in that: the cold source outlet (26) of the absorption tower communicates with at least one heat exchanger for heat exchange. 5. The ultra-clean emission cogeneration system of coking plant as claimed in claim 1, characterized in that: the regenerator (3) also has a regenerator heat source inlet (34), a regenerator heat source outlet (35), the The heat source inlet (34) of the regenerator is connected with the heat source outlet (35) of the regenerator through a heat source pipeline of the regenerator, and the working medium in the heat source pipeline of the regenerator is connected to the internal working fluid of the regenerator (3). The regenerator heat source inlet (34) communicates with the boiler cold source outlet (14). 6. The ultra-clean emission combined cooling and heating system of a coking plant according to claim 5, characterized in that: the heat source outlet (35) of the regenerator communicates with at least one heat exchanger for heat exchange. 7. The ultra-clean emission cogeneration system of coking plant as claimed in claim 2, 4 or 6, characterized in that: the ultra-clean emission cogeneration system of coking plant also includes an absorption refrigeration unit (4), The absorption refrigerating unit (4) communicates with at least one heat exchanger for heat exchange. 8. The ultra-clean emission cogeneration system of coking plant as claimed in claim 1, characterized in that, the ultra-clean emission cogeneration system of coking plant further comprises: The first heat exchanger (5), the first heat exchanger (5) is located between the boiler flue gas outlet (12) and the absorption tower flue gas inlet (21), the first heat exchanger (5) having a first flue gas inlet (51), a first flue gas outlet (52), a first cold source inlet (53), a first cold source outlet (54), and the first flue gas inlet (51) , the first flue gas outlets (52) are connected through the first flue gas pipeline, and the first cold source inlet (53) and the first cold source outlet (54) are connected through the first cold source pipeline, The flue gas in the first flue gas pipe exchanges heat with the working fluid in the first cold source pipe, the boiler flue gas outlet (12) communicates with the first flue gas inlet (51), The first flue gas outlet (52) communicates with the absorption tower flue gas inlet (21); The second heat exchanger (6), the second heat exchanger (6) has a second cold source inlet (61), a second cold source outlet (62), a second heat source inlet (63), and a second heat source outlet (64), the second cold source inlet (61), the second cold source outlet (62) are connected through the second cold source pipeline, the second heat source inlet (63), the second heat source outlet (64 ) through the second heat source pipeline, the working fluid in the second cold source pipeline and the working medium in the second heat source pipeline perform heat exchange, the second heat source inlet (63) and the two The secondary steam outlet (33) is connected, the second heat source outlet (64) is connected with the external pipeline, the second cold source inlet (61), the second cold source outlet (62), the first cold source outlet (54) are interconnected; The third heat exchanger (7), the third heat exchanger (7) has a third cold source inlet (71), a third cold source outlet (72), a third heat source inlet (73), a third heat source outlet (74), the third cold source inlet (71), the third cold source outlet (72) are connected through the third cold source pipeline, the third heat source inlet (73), the third heat source outlet (74 ) are connected through the third heat source pipeline, the working fluid in the third cold source pipeline and the working medium in the third heat source pipeline perform heat exchange, the third heat source inlet (73) and the two The secondary steam outlet (33) is connected, the third heat source outlet (74) is connected to the second heat source outlet (64), the third cold source inlet (71), the third cold source outlet (72) All communicate with the external pipeline. 9. The ultra-clean emission cogeneration system of coking plant as claimed in claim 8, characterized in that: Described absorption tower (2) also has absorption tower cooling source inlet (25), absorption tower cooling source outlet (26), between described absorption tower cooling source inlet (25), absorption tower cooling source outlet (26) through absorption The tower cooling source pipeline is connected, and the working fluid of the absorption tower cooling source pipeline is heat-exchanged with the internal working fluid of the absorption tower (2); The regenerator (3) also has a regenerator heat source inlet (34), a regenerator heat source outlet (35), and the regenerator heat source inlet (34) and the regenerator heat source outlet (35) pass through the regenerator heat source The pipelines are connected, and the working medium in the heat source pipeline of the regenerator exchanges heat with the working medium inside the regenerator (3), and the heat source inlet (34) of the regenerator is connected to the cold source outlet (14) of the boiler. Connected; The ultra-clean emission combined cooling and heating system of the coking plant also includes a fourth heat exchanger (8), and the fourth heat exchanger (8) has a fourth cold source inlet (81), a fourth cold source outlet (82 ), the fourth heat source inlet (83), the fourth heat source outlet (84), the fourth cold source inlet (81), the fourth cold source outlet (82) are connected through the fourth cold source pipeline, and the The fourth heat source inlet (83) and the fourth heat source outlet (84) are connected through a fourth heat source pipeline, and the working fluid in the fourth cold source pipeline performs heat exchange with the working medium in the fourth heat source pipeline , the fourth heat source inlet (83) communicates with the regenerator heat source outlet (35), the fourth heat source outlet (84) communicates with the external pipeline, and the fourth cold source inlet (81 ) communicates with the cold source outlet (26) of the absorption tower, and the fourth cold source outlet (82) communicates with the third cold source inlet (71). 10. The ultra-clean emission cogeneration system of coking plant as claimed in claim 8, characterized in that: the ultra-clean emission cogeneration system of coking plant also includes an absorption refrigeration unit (4), and the absorption type The refrigerating unit (4) has a refrigerating unit heat source inlet (41), a refrigerating unit heat source outlet (42), a refrigerating unit chilled water inlet (43), a refrigerating unit chilled water outlet (44), and the refrigerating unit heat source inlet (41), The heat source outlets (42) of the refrigeration units are connected through the heat source pipelines of the refrigeration units, the chilled water inlets (43) of the refrigeration units and the chilled water outlets (44) of the refrigeration units are connected through chilled water pipelines, and the chilled water pipelines The chilled water of the refrigeration unit exchanges heat with the working medium in the heat source pipeline of the refrigeration unit. The chilled water inlet (43) of the refrigeration unit and the chilled water outlet (44) of the refrigeration unit are connected to the external pipeline. The heat source of the refrigeration unit The inlet (41) communicates with the first cold source outlet (54), and the heat source outlet (42) of the refrigeration unit communicates with the first cold source inlet (53). 11. The ultra-clean emission cogeneration system of coking plant as claimed in claim 1, characterized in that: the ultra-clean emission cogeneration system of coking plant also includes a heater (10), and the heater (10 ) includes coke oven flue gas inlet (101), coke oven flue gas outlet (102), heating source inlet (103), heating source outlet (104), the coke oven flue gas inlet (101), coke oven flue gas outlet (102) are connected through the coke oven flue gas pipeline, and the heating source inlet (103) and the heating source outlet (104) are connected through the heating source pipeline, and the flue gas in the coke oven flue gas pipeline is connected with the The working fluid in the heating source pipeline performs heat exchange, and the coke oven flue gas outlet (102) communicates with the denitration flue gas inlet (91).