CN211475997U - Coke oven gas boiler afterbody flue gas system - Google Patents

Coke oven gas boiler afterbody flue gas system Download PDF

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Publication number
CN211475997U
CN211475997U CN201922035722.1U CN201922035722U CN211475997U CN 211475997 U CN211475997 U CN 211475997U CN 201922035722 U CN201922035722 U CN 201922035722U CN 211475997 U CN211475997 U CN 211475997U
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China
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air
outlet
flue gas
inlet
air preheater
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CN201922035722.1U
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王小龙
刘立新
张单
黄永和
刘维伟
常刘军
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China City Environment Protection Engineering Ltd
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China City Environment Protection Engineering Ltd
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    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00Combustion technologies with mitigation potential
    • Y02E20/34Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery

Abstract

The utility model belongs to the technical field of gas power generation, in particular to a flue gas system at the tail part of a coke oven gas boiler, which comprises a boiler, a primary tubular air preheater and a secondary heat pipe type air preheater; the air inlet of the secondary heat pipe type air preheater is communicated with the air supply unit; the air outlet of the secondary heat pipe type air preheater is communicated with the air inlet of the primary pipe type air preheater, and the air outlet of the primary pipe type air preheater is communicated with the burner of the boiler; the exhanst gas outlet of boiler and one-level tubular air heater's flue gas inlet intercommunication, one-level tubular air heater exhanst gas outlet and second grade heat pipe formula air heater's flue gas inlet intercommunication, second grade heat pipe formula air heater's exhanst gas outlet passes through draught fan and chimney intercommunication. The utility model discloses an adopt multistage heat transfer mode to carry out the segmentation to the boiler afterbody flue gas and consider, when retrieving the flue gas waste heat, prolong the life of heat transfer surface at different levels to improve unit economic nature.

Description

Coke oven gas boiler afterbody flue gas system
Technical Field
The utility model belongs to the technical field of the gas power generation, concretely relates to coke oven gas boiler afterbody flue gas system.
Background
Coke oven gas is a byproduct of the coking industry, and is a combustible gas generated after high-temperature dry distillation in a coke oven, and the main component of the combustible gas is H2(55% -60%) and CH4(23% -27%), and in addition, the additive also contains a small amount of CO and C2The above unsaturated hydrocarbon, CO2、O2、N2. The coke oven gas belongs to medium heat value gas (the heat value is 17-19 MJ/Nm)3) It is suitable for use as industrial boiler fuel and city gas. China is the country with the largest coke output in the world, the generated coke oven gas has huge amount, and a large amount of coke oven gas is still left except part of coke oven gas for ensuring the oven temperature of the coke oven. The application of the coke oven gas in combustion power generation is an economic and environment-friendly utilization mode, and is an effective means for treating surplus coke oven gas in most domestic coke-oven plants.
However, because coke oven gas is not thoroughly cleaned, the gas contains a large amount of impurities, in which sulfur-containing compounds are combusted to form SO2When acid gas is present, when SO2When the concentration of the acid gas is higher, the acid dew point of the flue gas is also higher. In order to improve the efficiency of the boiler, it is generally desirable to reduce the exhaust gas temperature of the boiler, but the temperature of the metal heat exchange surface of the air preheater is affected by both the exhaust gas and the air, and when the temperature of the metal wall surface of the air preheater is lower than the acid dew point of the exhaust gas, the air preheater is prone to low-temperature corrosion, the service life of the air preheater is seriously affected, and therefore the safe and stable operation and the economical efficiency of the boiler are affected. At present, for coke oven gas boilers, air preheaters are generally in a tubular form, and in order to improve the corrosion resistance of an air preheater and prolong the service life of the air preheater, acid-resistant steel or stainless steel is generally adopted, so that the air preheater is improvedThe corrosion resistance of the composite material is also realized by adopting an enamel pipe for corrosion prevention. However, the acid-resistant steel or the stainless steel has high cost and an unobvious corrosion-resistant effect, while the enamel pipe has a good corrosion-resistant effect, but the enamel is easy to fall off due to the reasons of manufacture, transportation, installation and the like, so that the corrosion-resistant effect is greatly reduced.
Disclosure of Invention
In order to overcome the defects existing in the prior art, the utility model aims to provide a coke oven gas boiler afterbody flue gas system, which solves the problem that the tail air preheater of the coke oven gas boiler is easy to cause low-temperature corrosion when ensuring the boiler efficiency, thereby improving the safety stability and the economical efficiency of the unit operation.
In order to realize the aim, the technical scheme of the utility model is a flue gas system at the tail part of a coke oven gas boiler, which comprises a boiler, a primary tubular air preheater and a secondary heat pipe type air preheater; the air inlet of the secondary heat pipe type air preheater is communicated with the air supply unit; the air outlet of the secondary heat pipe type air preheater is communicated with the air inlet of the primary pipe type air preheater through a secondary air preheater outlet air duct, and the air outlet of the primary pipe type air preheater is communicated with the burner of the boiler through a primary air preheater outlet air duct; the exhanst gas outlet of boiler with one-level tubular air heater's flue gas inlet intercommunication, one-level tubular air heater exhanst gas outlet with second grade heat pipe air heater's flue gas inlet intercommunication, second grade heat pipe air heater's exhanst gas outlet passes through draught fan and chimney intercommunication.
Further, the air supply unit comprises a fan heater and a fan, an air inlet of the fan is communicated with an air inlet channel of the fan, an air outlet of the fan is communicated with an air inlet of the fan heater through an air outlet channel of the fan, and an air outlet of the fan heater is communicated with an air inlet of the second-stage heat pipe type air preheater.
Furthermore, the system further comprises a hot air recirculation unit, wherein the air inlet end of the hot air recirculation unit is communicated with the first-stage air preheater outlet air duct or the second-stage air preheater outlet air duct, and the air outlet end of the hot air recirculation unit is communicated with the air feeder inlet air duct or the air feeder outlet air duct. In the embodiment, the air taking point of the hot air recycling unit can be arranged at the outlet of the primary tubular air preheater, and the air returning point can be arranged at the inlet of the air feeder; the hot air recycling unit can also be arranged at the inlet of the primary tubular air preheater, the air return point can also be arranged at the outlet of the air feeder, and at the moment, the recycling air volume proportion is set according to the requirement.
Furthermore, the hot air recycling unit extracts hot air from an air outlet of the primary tubular air preheater by a ratio of 15-20%.
Furthermore, a silencer is installed at one end, away from the air heater, of the air duct at the air inlet of the air blower.
Furthermore, the primary tubular air preheater comprises a shell and a heat exchange tube arranged in the shell, and two ends of the heat exchange tube of the primary tubular air preheater are respectively communicated with an air inlet and an air outlet of the primary tubular air preheater; still be equipped with the flue gas passageway in the casing, and the both ends of flue gas passageway communicate with flue gas entry and exhanst gas outlet on the casing respectively.
Furthermore, the heat exchange tube of the primary tubular air preheater is externally coated with enamel, and the heat exchange tube at the air inlet side of the primary tubular air preheater is made of ND steel.
Furthermore, the secondary heat pipe type air preheater comprises a box body, the box body is divided into an upper channel and a lower channel by a middle partition plate, an air inlet and an air outlet are respectively arranged at two ends of the upper channel, and a flue gas inlet and a flue gas outlet are respectively arranged at two ends of the lower channel; the middle partition plate is provided with a heat exchange tube penetrating through the middle partition plate, and the heat exchange tube of the secondary heat tube type air preheater is filled with a heat exchange medium.
Furthermore, the heat exchange tube of the secondary heat pipe type air preheater adopts a finned tube, and the heat exchange tube on the flue gas outlet side of the secondary heat pipe type air preheater adopts ND steel material.
Furthermore, the air heater comprises a shell and a tubular heat exchange element arranged in the shell, and two ends of the tubular heat exchange element are respectively communicated with an air inlet and an air outlet of the air heater; still be equipped with steam inlet and condensate outlet on the shell, steam inlet and the steam outlet intercommunication of continuous blowdown flash tank, the condensate outlet communicates with hydrophobic flash tank.
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model adopts a multi-stage heat exchange mode to consider the flue gas at the tail part of the boiler in a segmented manner, thereby prolonging the service life of each stage of heat exchange surface while recovering the waste heat of the flue gas, and further improving the economical efficiency of the unit;
(2) the utility model adopts the secondary heat pipe type air preheater, which not only can fully utilize the waste heat of the flue gas, but also can obviously improve the temperature of the metal wall surface of the heat exchange at the flue gas side, enhance the corrosion resistance of the heat exchanger and prolong the service life of the heat exchanger;
(3) the utility model adopts the air heater to improve the air temperature at the inlet side of the air preheater, thereby improving the air inlet temperature of the air preheater, improving the temperature of the heat exchange metal wall surface of the air preheater and enhancing the corrosion resistance of the heat exchanger;
(4) the utility model discloses a hot air recirculation unit improves the temperature before the cold junction air admission air preheater to can initiatively improve the temperature level of heat exchange tube pipe wall in the air preheater, improve the corrosion-resistant ability of heat exchange tube.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view of a flue gas system at the tail of a coke oven gas boiler provided by the embodiment of the present invention;
FIG. 2 is a working schematic diagram of a second-stage heat pipe type air preheater of a flue gas system at the tail of a coke oven gas boiler provided by the embodiment of the utility model;
in the figure: 1. boiler, 2, one-level tubular air heater, 3, second grade heat pipe formula air heater, 4, air heater, 5, forced draught blower, 6, muffler, 7, draught fan, 8, chimney, 9, combustor, 10, forced draught blower entry wind channel, 11, forced draught blower export wind channel, 12, second grade air heater export wind channel, 13, one-level air heater export wind channel, 14, hot air recycling pipeline, 15, one-level air heater export flue, 16, second grade air heater export flue, 17, intermediate bottom.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.
The terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of the present invention, "a plurality" means two or more unless otherwise specified.
As shown in fig. 1-2, an embodiment of the present invention provides a flue gas system at the tail of a coke oven gas boiler, which comprises a boiler 1, a primary tubular air preheater 2 and a secondary heat pipe type air preheater 3; the air inlet of the secondary heat pipe type air preheater 3 is communicated with the air supply unit; an air outlet of the secondary heat pipe type air preheater 3 is communicated with an air inlet of the primary pipe type air preheater 2 through a secondary air preheater outlet air duct 12, and an air outlet of the primary pipe type air preheater 2 is communicated with a combustor 9 of the boiler 1 through a primary air preheater outlet air duct 13; boiler 1's exhanst gas outlet with one-level tubular air heater 2's flue gas inlet intercommunication, 2 exhanst gas outlets of one-level tubular air heater with second grade heat pipe air heater 3's flue gas inlet intercommunication, second grade heat pipe air heater 3's exhanst gas outlet passes through draught fan 7 and chimney 8 intercommunication. The utility model discloses an adopt multistage heat transfer mode to carry out the segmentation to the boiler afterbody flue gas and consider, when retrieving the flue gas waste heat, prolong the life of heat transfer surface at different levels to improve unit economic nature. The blower 5 and the induced draft fan 7 of the present embodiment are used for blowing and discharging smoke during normal operation of the boiler 1.
Further, the air supply unit comprises a warm air device 4 and an air supply device 5, an air inlet of the air supply device 5 is communicated with an air supply device inlet air channel 10, an air outlet is communicated with an air inlet of the warm air device 4 through an air supply device outlet air channel 11, and an air outlet of the warm air device 4 is communicated with an air inlet of the second-stage heat pipe type air preheater 3. The utility model discloses a fan heater 4 can improve air preheater entrance side air temperature to improve air preheater air inlet temperature, thereby improve air preheater heat transfer metal wall temperature, strengthen the corrosion resisting property of heat exchanger.
Furthermore, the system further comprises a hot air recirculation unit, wherein an air inlet end of the hot air recirculation unit is communicated with the primary air preheater outlet air duct 13 or the secondary air preheater outlet air duct 12, and an air outlet end of the hot air recirculation unit is communicated with the blower inlet air duct 10 or the blower outlet air duct 11. In the embodiment, the hot air recirculation unit is adopted to increase the temperature of the air at the cold end before entering the air preheater, so that the temperature level of the pipe wall of the heat exchange pipe in the air preheater can be actively increased, and the corrosion resistance of the heat exchange pipe is improved; the hot air recycling unit comprises a hot air recycling pipeline 14, an air taking point of the hot air recycling pipeline 14 can be arranged at the outlet of the primary tubular air preheater 2, and an air returning point can be arranged at the inlet of the blower 5; the air taking point of the hot air recycling pipeline 14 can also be arranged at the inlet of the primary tubular air preheater 2, the air returning point can also be arranged at the outlet of the blower 5, and at the moment, the recycling air quantity proportion can be set according to the requirement.
Furthermore, the hot air recycling unit extracts hot air from an air outlet of the primary tubular air preheater 2 by a ratio of 15-20%.
Further, a silencer 6 is installed at one end of the blower inlet duct 10 away from the heater 4.
Furthermore, the primary tubular air preheater comprises a shell and a heat exchange tube arranged in the shell, and two ends of the heat exchange tube of the primary tubular air preheater 2 are respectively communicated with an air inlet and an air outlet of the primary tubular air preheater 2; still be equipped with the flue gas passageway in the casing, and the both ends of flue gas passageway communicate with flue gas entry and exhanst gas outlet on the casing respectively. The first-level tubular air preheater of this embodiment can adopt horizontal arrangement, also can vertically arrange, and all are that the flue gas walks the outer flow of pipe, and the interior flow is walked to the air, when guaranteeing the heat exchanger life-span, can reduce overall system's investment cost. Furthermore, the heat exchange tube of the primary tube type air preheater 2 is externally coated with enamel, and the material of the heat exchange base tube on the air inlet side is ND steel, so that the corrosion resistance of the heat exchange tube is further improved, and the service life of the air preheater is prolonged. The first-stage tubular air preheater 2 of the present embodiment can also adopt a heat pipe type, and the principle is the same as that of the second-stage heat pipe type air preheater 3.
Further, the secondary heat pipe type air preheater 3 is divided into an upper channel and a lower channel by a middle partition plate 17 which is horizontally arranged; the two ends of the upper channel are respectively provided with an air inlet and an air outlet which are used for introducing cold air; two ends of the lower channel are respectively provided with a flue gas inlet and a flue gas outlet for introducing hot flue gas; the middle partition plate 17 is provided with a heat exchange tube penetrating through the middle partition plate 17, two ends of the heat exchange tube of the secondary heat tube type air preheater 3 are sealed, a heat exchange medium is filled in the heat exchange tube, and the heat exchange tube is vertically arranged. The second grade heat pipe formula air heater 3 of this embodiment adopts the heat pipe structural style, and hot flue gas and cold air carry out the heat transfer with the heat transfer medium in second grade heat pipe formula air heater 3's the heat exchange tube respectively to this is reciprocal, and both can abundant utilization flue gas waste heat, can guarantee again that flue gas side heat exchange tube wall temperature is at controllable level, thereby improves the anti low temperature corrosion resistance of heat-transfer surface, increases its life-span. Furthermore, the heat exchange tube of the second-stage heat-tube air preheater 3 adopts a finned tube, and the material of the heat exchange base tube at the side part of the flue gas outlet of the second-stage heat-tube air preheater 3 adopts ND steel, so that the corrosion resistance of the heat exchange tube is further improved, and the service life of the air preheater is prolonged.
Furthermore, the air heater comprises a shell and a tubular heat exchange element arranged in the shell, and two ends of the tubular heat exchange element are respectively communicated with an air inlet and an air outlet of the air heater; still be equipped with steam inlet and condensate outlet on the shell, steam inlet and the steam outlet intercommunication of continuous blowdown flash tank, the condensate outlet communicates with hydrophobic flash tank. The heat exchange tube of the air heater can be in a finned tube type, a steam source is taken from the steam exhaust side of the continuous blowdown flash tank in a boiler system, secondary steam is used as a heat source to exchange heat with air, the steam is condensed into condensed water after heat exchange, and the condensed water is drained to the steam turbine body drainage flash tank.
The process of treating the flue gas at the tail part of the boiler by adopting the flue gas system at the tail part of the coke oven gas boiler of the embodiment is as follows:
the air required by the combustion of the fuel in the boiler 1 is sucked from the atmosphere through the air feeder 5 and the silencer 6, and is sent to the air heater 4 through the air duct 11 at the outlet of the air feeder, the air temperature can be increased by about 40-50 ℃ from the ambient temperature through the air heater 4, then the heated air is sent to the secondary heat pipe type air preheater 3 for air-flue gas heat exchange, so that the air temperature is further increased by 80-100 ℃, and is further sent to the primary pipe type air preheater 2 for heat exchange with the flue gas continuously, and finally the air temperature can reach 200 ℃ after being heated by three stages, and then the air is sent to the combustor 9 of the boiler 1 to be mixed with the fuel for auxiliary fuel combustion;
the temperature of flue gas after combustion in the boiler 1 is about 280-300 ℃ after heat exchange of each stage of heating surface to the inlet of the primary tubular air preheater 2, the temperature of the flue gas is reduced by 60-80 ℃ after heat exchange with air by the primary tubular air preheater 2, the flue gas enters the secondary heat pipe type air preheater 3, the temperature of the flue gas can be reduced by 70-90 ℃ after further heat exchange with air, the temperature of the flue gas after heat exchange is guaranteed to be 20-30 ℃ (safety margin) higher than the acid dew point temperature of the flue gas, and finally the flue gas is discharged into the atmosphere after being led out to a chimney 8 by an induced draft fan 7.
Meanwhile, one path of hot air can be led up to the air duct 10 at the inlet of the air feeder from the air duct 13 at the outlet of the primary air preheater, the proportion of the hot air is extracted by 15-20%, the temperature of the wall of the heat exchange tube of the primary tubular air preheater 2 and the temperature of the wall of the heat exchange tube of the secondary tubular air preheater 3 can be further increased under the condition of winter and when the acid dew point of the flue gas is higher, the temperature of the wall of the heat exchange tube is 20-30 ℃ higher than the acid dew.
The utility model discloses a coke oven gas boiler afterbody flue gas system is not restricted to coke oven gas boiler's afterbody flue gas and handles, is applicable to the processing of the higher other flue gases of sulphur content in the flue gas equally.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention, and any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A coke oven gas boiler tail flue gas system is characterized in that: comprises a boiler, a primary tubular air preheater and a secondary heat pipe type air preheater; the air inlet of the secondary heat pipe type air preheater is communicated with the air supply unit; the air outlet of the secondary heat pipe type air preheater is communicated with the air inlet of the primary pipe type air preheater through a secondary air preheater outlet air duct, and the air outlet of the primary pipe type air preheater is communicated with the burner of the boiler through a primary air preheater outlet air duct; the exhanst gas outlet of boiler with one-level tubular air heater's flue gas inlet intercommunication, one-level tubular air heater exhanst gas outlet with second grade heat pipe air heater's flue gas inlet intercommunication, second grade heat pipe air heater's exhanst gas outlet passes through draught fan and chimney intercommunication.
2. The coke oven gas boiler tail flue gas system of claim 1, wherein: the air supply unit comprises a fan heater and a fan, the air inlet of the fan is communicated with the air inlet duct of the fan, the air outlet of the fan is communicated with the air inlet of the fan heater through the air outlet duct of the fan, and the air outlet of the fan heater is communicated with the air inlet of the second-stage heat pipe type air preheater.
3. The coke oven gas boiler tail flue gas system of claim 2, wherein: the system further comprises a hot air recirculation unit, wherein the air inlet end of the hot air recirculation unit is communicated with the first-stage air preheater outlet air duct or the second-stage air preheater outlet air duct, and the air outlet end of the hot air recirculation unit is communicated with the air feeder inlet air duct or the air feeder outlet air duct.
4. The coke oven gas boiler tail flue gas system of claim 3, wherein: the hot air recycling unit extracts hot air from an air outlet of the primary tubular air preheater by a ratio of 15-20%.
5. The coke oven gas boiler tail flue gas system of claim 2, wherein: and a silencer is arranged at one end of the air duct of the air feeder inlet, which deviates from the air heater.
6. The coke oven gas boiler tail flue gas system of claim 1, wherein: the primary tubular air preheater comprises a shell and a heat exchange tube arranged in the shell, and two ends of the heat exchange tube of the primary tubular air preheater are respectively communicated with an air inlet and an air outlet of the primary tubular air preheater; still be equipped with the flue gas passageway in the casing, and the both ends of flue gas passageway communicate with flue gas entry and exhanst gas outlet on the casing respectively.
7. The coke oven gas boiler tail flue gas system of claim 6, wherein: the heat exchange tube of the primary tubular air preheater is externally coated with enamel, and the heat exchange tube at the air inlet side of the primary tubular air preheater is made of ND steel.
8. The coke oven gas boiler tail flue gas system of claim 1, wherein: the secondary heat pipe type air preheater comprises a box body, the box body is divided into an upper channel and a lower channel by a middle partition plate, an air inlet and an air outlet are respectively arranged at two ends of the upper channel, and a flue gas inlet and a flue gas outlet are respectively arranged at two ends of the lower channel; the middle partition plate is provided with a heat exchange tube penetrating through the middle partition plate, and the heat exchange tube of the secondary heat tube type air preheater is filled with a heat exchange medium.
9. The coke oven gas boiler tail flue gas system of claim 8, wherein: the heat exchange tube of the second-stage heat pipe type air preheater adopts a finned tube, and the heat exchange tube on the flue gas outlet side of the second-stage heat pipe type air preheater is made of ND steel.
10. The coke oven gas boiler tail flue gas system of claim 2, wherein: the air heater comprises a shell and a tubular heat exchange element arranged in the shell, wherein two ends of the tubular heat exchange element are respectively communicated with an air inlet and an air outlet of the air heater; still be equipped with steam inlet and condensate outlet on the shell, steam inlet and the steam outlet intercommunication of continuous blowdown flash tank, the condensate outlet communicates with hydrophobic flash tank.
CN201922035722.1U 2019-11-22 2019-11-22 Coke oven gas boiler afterbody flue gas system Active CN211475997U (en)

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Application Number Priority Date Filing Date Title
CN201922035722.1U CN211475997U (en) 2019-11-22 2019-11-22 Coke oven gas boiler afterbody flue gas system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201922035722.1U CN211475997U (en) 2019-11-22 2019-11-22 Coke oven gas boiler afterbody flue gas system

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Publication Number Publication Date
CN211475997U true CN211475997U (en) 2020-09-11

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