CN210345419U - Flue gas waste heat recovery system - Google Patents
Flue gas waste heat recovery system Download PDFInfo
- Publication number
- CN210345419U CN210345419U CN201921141565.6U CN201921141565U CN210345419U CN 210345419 U CN210345419 U CN 210345419U CN 201921141565 U CN201921141565 U CN 201921141565U CN 210345419 U CN210345419 U CN 210345419U
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- Prior art keywords
- flue gas
- steam
- pipeline
- waste heat
- water
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N carbon monoxide Chemical compound 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- 239000003546 flue gas Substances 0.000 title claims abstract description 87
- 239000002918 waste heat Substances 0.000 title claims abstract description 51
- 238000011084 recovery Methods 0.000 title claims abstract description 18
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- 238000004939 coking Methods 0.000 description 7
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound 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[C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 239000003245 coal Substances 0.000 description 4
- 238000010438 heat treatment Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000000197 pyrolysis Methods 0.000 description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N benzene Chemical compound 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Abstract
The utility model relates to a flue gas waste heat recovery system, which comprises a flue gas main pipeline, a chimney, a steam system and a hot water system; the smoke main pipeline is connected between the coke oven and the chimney, and the steam system consists of a waste heat boiler, a steam-water separator, a deaerator and a steam distributing cylinder; the hot water system consists of a heat exchanger and a water separator; the utility model discloses a set up steam system and hot water system and carry out the two-stage recovery to the waste heat of coke oven flue gas, the waste of the energy has been avoided to the heat of make full use of flue gas, and the fume emission after the cooling has reduced the pollution that the flue gas caused to the air in to the atmosphere.
Description
Technical Field
The utility model relates to a coal chemical industry flue gas heat recovery technical field especially relates to a flue gas waste heat recovery system.
Background
The coking industry refers to the industry of producing coke and simultaneously obtaining chemical products by using coal as a raw material through high-temperature dry distillation. The coking is also called dry distillation or high-temperature coking of coal, and is a process of heating the coal in a coke oven to 950-1150 ℃ by insulating air, and producing coke, coke oven gas, crude benzene, ammonia and coal tar through drying, pyrolysis, melting, bonding, solidification and shrinkage. In the coke production process, a great amount of waste flue gas with the temperature of about 300 ℃ is generated in a coke carbonization chamber. Typically, these fumes are collected in a main flue and then discharged directly into the atmosphere.
The waste flue gas is directly discharged into the air through a chimney, which wastes energy and pollutes the environment. Coke plants typically require additional boiler heating to provide steam for plant heating and other coking processes. Especially in the northern cold winter season, the steam demand often exceeds the load of the existing boiler systems in the plant. In addition, the domestic water also needs to be heated in winter, so that the burden of the boiler is further increased, and the increase of the number of the boilers is not beneficial to energy conservation and emission reduction. If the waste heat of the flue gas can be recycled to heat steam and hot water for life or production of a coking plant, the problems of resource waste and environmental pollution caused by direct emission of the flue gas can be avoided, and the problem of overload operation of a boiler system in a plant area can be solved.
Disclosure of Invention
The utility model provides a flue gas waste heat recovery system carries out the two-stage through the waste heat that sets up steam system and hot water system and retrieve focusing furnace flue gas, and the waste of the energy has been avoided to the heat of make full use of flue gas, and the fume emission after the cooling has reduced the pollution that the flue gas caused to the air in to the atmosphere.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a flue gas waste heat recovery system comprises a flue gas main pipeline, a chimney, a steam system and a hot water system; the flue gas main pipeline is connected between the coke oven and the chimney, and a flue gas outlet, a gate valve I and a flue gas return opening are sequentially arranged on the flue gas main pipeline along the flow direction of flue gas; the steam system consists of a waste heat boiler, a steam-water separator, a deaerator and a steam distributing cylinder; a smoke inlet of the waste heat boiler is connected with a smoke outlet on a smoke main pipeline through a smoke inlet pipeline, and a valve plate valve II is arranged on the smoke inlet pipeline; the top of the waste heat boiler is provided with a mixed steam outlet and a circulating water inlet, wherein the mixed steam outlet is sequentially connected with a steam-water separator and a steam-distributing cylinder through a steam pipeline, the steam-water separator is further sequentially connected with a deaerator and the circulating water inlet of the waste heat boiler through a circulating water pipeline, and the deaerator is provided with a tap water inlet connected with an external tap water pipeline; the hot water system consists of a heat exchanger and a water separator; a flue gas outlet of the waste heat boiler is connected with a flue gas inlet of the heat exchanger, a flue gas outlet of the heat exchanger is connected with a flue gas returning opening on a flue gas main pipeline through a flue gas outlet pipeline, and a gate valve III and an induced draft fan are sequentially arranged on the flue gas outlet pipeline along the flow direction of flue gas; a heat exchange medium inlet of the heat exchanger is connected with a tap water pipeline, and a water diversion pump is arranged on the tap water pipeline; a heat exchange medium outlet of the heat exchanger is connected with the water separator through a heat exchange medium outlet pipeline, and a water feeding pump and a valve I are arranged on the heat exchange medium outlet pipeline.
The heat exchanger adopts a tube type heat exchanger.
The heat exchanger adopts a fixed tube-plate heat exchanger.
The waste heat boiler is a heat pipe waste heat boiler.
And a second valve is arranged on a steam pipeline between the waste heat boiler and the steam-water separator, and a third valve is arranged on a steam pipeline between the steam-water separator and the steam-distributing cylinder.
And a fourth valve is arranged on a circulating water pipeline between the steam-water separator and the deaerator, and a fifth valve is arranged on a circulating water pipeline between the deaerator and the waste heat boiler.
And a sixth valve is arranged on a tap water pipeline at the upstream of the deaerator.
Compared with the prior art, the beneficial effects of the utility model are that:
1) the heat of the coke oven flue gas is recycled for producing steam through the steam system, so that the problem of overload operation of boilers of coke plants in winter in the north is solved, and the heat utilization efficiency is improved;
2) the residual heat of the flue gas is further recovered by arranging a hot water system, and the generated hot water is used for domestic water for washing hands, washing vegetables, bathing and the like in a factory, so that the power consumption of the factory is reduced, and the energy is saved;
3) the flue gas after the two-stage heat exchange is discharged into the air through a chimney, so that the pollution to the environment is reduced, and the aims of energy conservation and emission reduction are fulfilled.
Drawings
Fig. 1 is a schematic structural diagram of a flue gas waste heat recovery system of the present invention.
In the figure: 1. flue gas main pipeline 2, chimney 3, waste heat boiler 4, heat exchanger 5, steam-water separator 6, steam-distributing cylinder 7, deaerator 8, water separator 9, gate valve I10, gate valve II 11, draught fan 12, priming pump 13, gate valve III 14, valve I15, valve II 16, valve III 17, valve IV 18, valve V19, valve VI 20, water supply pump
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the flue gas waste heat recovery system of the present invention comprises a flue gas main pipe 1, a chimney 2, a steam system and a hot water system; the flue gas main pipeline 1 is connected between the coke oven and the chimney 2, and a flue gas outlet, a gate valve I9 and a flue gas return opening are sequentially arranged on the flue gas main pipeline 1 along the flow direction of flue gas; the steam system consists of a waste heat boiler 3, a steam-water separator 5, a deaerator 7 and a steam distributing cylinder 6; a smoke inlet of the waste heat boiler 3 is connected with a smoke outlet on the smoke main pipeline 1 through a smoke inlet pipeline, and a valve plate valve II 10 is arranged on the smoke inlet pipeline; the top of the waste heat boiler 3 is provided with a mixed steam outlet and a circulating water inlet, wherein the mixed steam outlet is sequentially connected with a steam-water separator 5 and a steam-distributing cylinder 6 through a steam pipeline, the steam-water separator 5 is further sequentially connected with a deaerator 7 and the circulating water inlet of the waste heat boiler 3 through a circulating water pipeline, and the deaerator 7 is provided with a tap water inlet connected with an external tap water pipeline; the hot water system consists of a heat exchanger 4 and a water separator 8; a flue gas outlet of the waste heat boiler 3 is connected with a flue gas inlet of a heat exchanger 4, a flue gas outlet of the heat exchanger 4 is connected with a flue gas returning opening on a flue gas main pipeline 1 through a flue gas outlet pipeline, and a gate valve III 13 and an induced draft fan 11 are sequentially arranged on the flue gas outlet pipeline along the flow direction of flue gas; the heat exchange medium inlet of the heat exchanger 4 is connected with a tap water pipeline, and a water guide pump 12 is arranged on the tap water pipeline; the heat exchange medium outlet of the heat exchanger 4 is connected with the water separator 8 through a heat exchange medium outlet pipeline, and a water feeding pump 20 and a first valve 14 are arranged on the heat exchange medium outlet pipeline.
The heat exchanger 4 adopts a tube type heat exchanger.
The heat exchanger 4 adopts a fixed tube-plate heat exchanger.
The waste heat boiler 3 is a heat pipe waste heat boiler.
A second valve 15 is arranged on a steam pipeline between the waste heat boiler 3 and the steam-water separator 5, and a third valve 16 is arranged on a steam pipeline between the steam-water separator 5 and the steam-distributing cylinder 6.
A fourth valve 17 is arranged on a circulating water pipeline between the steam-water separator 5 and the deaerator 7, and a fifth valve 18 is arranged on a circulating water pipeline between the deaerator 7 and the waste heat boiler 3.
And a sixth valve 19 is arranged on the tap water pipeline at the upstream of the deaerator 7.
The utility model discloses in, exhaust-heat boiler 3 preferentially adopts heat pipe exhaust-heat boiler, and heat pipe exhaust-heat boiler comprises a plurality of heat pipes, and the coefficient of heat conductivity of heat pipe is high, has higher thermal conversion efficiency, and the heat pipe is changed and is unpicked and wash the convenience in addition. The heat exchanger 4 preferably adopts a tubular heat exchanger, preferably a tubular heat exchanger, and most preferably a fixed tube-plate heat exchanger, wherein the fixed tube-plate heat exchanger has a simple and compact structure and is convenient to clean in a tube.
Flue gas heat recovery system's working process as follows: waste flue gas at about 300 ℃ generated by a carbonization chamber enters a flue gas inlet pipeline of a waste heat boiler through a gate valve I, tap water is deaerated by a deaerator 7 and then enters a liquid pipeline of the waste heat boiler 3 to exchange heat with the flue gas, steam generated after heat exchange of the tap water enters a steam-water separator 5 to separate hot water in the steam, and the separated steam enters a steam distributing cylinder 6 through a steam outlet to provide steam for heating in a plant area or different coking processes. The hot water separated from the steam-water separator 5 is deaerated by the deaerator 7 and then enters the waste heat boiler 3 again for generating steam, the flue gas discharged from the flue gas outlet of the waste heat boiler 3 enters the flue gas pipeline of the heat exchanger 4, the tap water enters the liquid pipeline of the heat exchanger 4 to exchange heat with the flue gas, the generated hot water is pumped into the water separator 8 through the water feeding pump 20, and the hot water is delivered to different hot water users through the water separator 8. The flue gas discharged from the heat exchanger 4 is introduced into a flue gas main pipeline 1 through a gate valve III and an induced draft fan 11 and is discharged into the atmosphere through a chimney 2.
The temperature of the flue gas generated by coking is about 300 ℃, the temperature is reduced to about 170 ℃ after heat exchange by a steam system, and the temperature is reduced to below 100 ℃ after heat exchange by a hot water system. The heat of the flue gas can be fully utilized after heat exchange is carried out through the two-stage heat exchange system, energy waste is avoided, and the flue gas after cooling is discharged to the atmosphere, so that the pollution of the flue gas to the air is reduced.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (7)
1. A flue gas waste heat recovery system is characterized by comprising a flue gas main pipeline, a chimney, a steam system and a hot water system; the flue gas main pipeline is connected between the coke oven and the chimney, and a flue gas outlet, a gate valve I and a flue gas return opening are sequentially arranged on the flue gas main pipeline along the flow direction of flue gas; the steam system consists of a waste heat boiler, a steam-water separator, a deaerator and a steam distributing cylinder; a smoke inlet of the waste heat boiler is connected with a smoke outlet on a smoke main pipeline through a smoke inlet pipeline, and a valve plate valve II is arranged on the smoke inlet pipeline; the top of the waste heat boiler is provided with a mixed steam outlet and a circulating water inlet, wherein the mixed steam outlet is sequentially connected with a steam-water separator and a steam-distributing cylinder through a steam pipeline, the steam-water separator is further sequentially connected with a deaerator and the circulating water inlet of the waste heat boiler through a circulating water pipeline, and the deaerator is provided with a tap water inlet connected with an external tap water pipeline; the hot water system consists of a heat exchanger and a water separator; a flue gas outlet of the waste heat boiler is connected with a flue gas inlet of the heat exchanger, a flue gas outlet of the heat exchanger is connected with a flue gas returning opening on a flue gas main pipeline through a flue gas outlet pipeline, and a gate valve III and an induced draft fan are sequentially arranged on the flue gas outlet pipeline along the flow direction of flue gas; a heat exchange medium inlet of the heat exchanger is connected with a tap water pipeline, and a water diversion pump is arranged on the tap water pipeline; a heat exchange medium outlet of the heat exchanger is connected with the water separator through a heat exchange medium outlet pipeline, and a water feeding pump and a valve I are arranged on the heat exchange medium outlet pipeline.
2. The flue gas waste heat recovery system according to claim 1, wherein the heat exchanger is a tube type heat exchanger.
3. The flue gas waste heat recovery system according to claim 2, wherein the heat exchanger is a fixed tube-plate heat exchanger.
4. The flue gas waste heat recovery system according to claim 1, wherein the waste heat boiler is a heat pipe waste heat boiler.
5. The flue gas waste heat recovery system according to claim 1, wherein a second valve is arranged on a steam pipeline between the waste heat boiler and the steam-water separator, and a third valve is arranged on a steam pipeline between the steam-water separator and the steam-distributing cylinder.
6. The flue gas waste heat recovery system of claim 1, wherein a fourth valve is arranged on a circulating water pipeline between the steam-water separator and the deaerator, and a fifth valve is arranged on a circulating water pipeline between the deaerator and the waste heat boiler.
7. The flue gas waste heat recovery system of claim 1, wherein a tap water pipeline upstream of the deaerator is provided with a sixth valve.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921141565.6U CN210345419U (en) | 2019-07-19 | 2019-07-19 | Flue gas waste heat recovery system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921141565.6U CN210345419U (en) | 2019-07-19 | 2019-07-19 | Flue gas waste heat recovery system |
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| CN210345419U true CN210345419U (en) | 2020-04-17 |
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| CN201921141565.6U Active CN210345419U (en) | 2019-07-19 | 2019-07-19 | Flue gas waste heat recovery system |
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| CN (1) | CN210345419U (en) |
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