US20130125841A1 - Device for recovering residual heat from exhaust gas - Google Patents

Device for recovering residual heat from exhaust gas Download PDF

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Publication number
US20130125841A1
US20130125841A1 US13/805,808 US201113805808A US2013125841A1 US 20130125841 A1 US20130125841 A1 US 20130125841A1 US 201113805808 A US201113805808 A US 201113805808A US 2013125841 A1 US2013125841 A1 US 2013125841A1
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Prior art keywords
exhaust gas
economizer
condensation
temperature
residual heat
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Abandoned
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US13/805,808
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English (en)
Inventor
Tarou Ichihara
Kenshu Teramoto
Ryosuke Sugita
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Mitsubishi Heavy Industries Ltd
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Mitsubishi Heavy Industries Ltd
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Assigned to MITSUBISHI HEAVY INDUSTRIES, LTD. reassignment MITSUBISHI HEAVY INDUSTRIES, LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ICHIHARA, TAROU, SUGITA, RYOSUKE, TERAMOTO, KENSHU
Publication of US20130125841A1 publication Critical patent/US20130125841A1/en
Abandoned legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/003—Feed-water heater systems
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F22D1/12—Control devices, e.g. for regulating steam temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F22—STEAM GENERATION
    • F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
    • F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
    • F22D1/02—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged in the boiler furnace, fire tubes, or flue ways
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J15/00—Arrangements of devices for treating smoke or fumes
    • F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24D—DOMESTIC- OR SPACE-HEATING SYSTEMS, e.g. CENTRAL HEATING SYSTEMS; DOMESTIC HOT-WATER SUPPLY SYSTEMS; ELEMENTS OR COMPONENTS THEREFOR
    • F24D2200/00—Heat sources or energy sources
    • F24D2200/16—Waste heat
    • F24D2200/18—Flue gas recuperation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium
    • F28D19/04—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier
    • F28D19/041—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium using rigid bodies, e.g. mounted on a movable carrier with axial flow through the intermediate heat-transfer medium
    • F28D19/042—Rotors; Assemblies of heat absorbing masses
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E20/00—Combustion technologies with mitigation potential
    • Y02E20/30—Technologies for a more efficient combustion or heat usage

Definitions

  • the present invention relates to a device for recovering residual heat from exhaust gas.
  • the present invention relates to a device for recovering residual heat from exhaust gas that includes a dry economizer which heats to-be-heated water by utilizing sensible heat of the exhaust gas, the dry economizer being provided in a duct extending to a funnel through which the exhaust gas is emitted to atmosphere; and a condensation economizer which heats to-be-heated water by utilizing latent heat of condensation of the exhaust gas, the condensation economizer being provided on the downstream side of the dry economizer.
  • an economizer which heats a boiler water supply (to-be-heated water) using residual heat of the exhaust gas.
  • the economizer recovers the residual heat of the exhaust gas by performing a heat exchange with the boiler water supply.
  • a condensation economizer has a configuration that is also able to recover latent heat discharged when vapor in the exhaust gas is condensed and becomes water.
  • Patent Document 1 discloses a boiler in which, in a duct through which the exhaust gas of a downward flow is circulated, a dry economizer, an air preheater, and a condensation economizer are sequentially disposed in series.
  • a dry economizer In Patent Document 1, residual quantity of heat contained in the exhaust gas passed through the dry economizer is able to be recovered by a tubular air preheater, and the condensation economizer.
  • condensation is promoted, and a slightly wet portion partially exists.
  • Patent Document 2 discloses a condensation economizer in which a sensible heat transfer area and a condensation heat transfer area are alternately provided in a duct through which the exhaust gas of downstream flow is circulated.
  • a fin tube through which a boiler water supply is circulated, is arranged in multiple stages, a front stage of the multi-stage fin tube is set to a sensible heat transfer area of a high temperature, a middle stage thereof is set to a condensation heat transfer area, and a rear stage thereof is set to a sensible heat transfer area of a low temperature, whereby the sensible heat and the latent heat of the exhaust gas are recovered in each heat transfer area.
  • the condensation economizer of the boiler of Patent Document 1 is disposed in the duct through which the exhaust gas of downstream flow is circulated and a partial wet portion is generated in the water pipe group by the condensation of vapor in the exhaust gas, the water pipe group has a wet area and a dry area.
  • the wet area and the dry area are changed in position along with a change in boiler load. That is, when the boiler load is changed, the temperature of the exhaust gas passing through the condensation economizer is changed.
  • a position, where the exhaust gas amounts to a condensation temperature is changed, a boundary position between the wet area and the dry area is changed.
  • the dry area is generated in the upper part of the condensation economizer, the wet area is generated in the lower part thereof, and a zone, where the drying and the wetting are repeated, is generated in the middle part thereof.
  • the water pipe group repeats the cooling and the heating, and thus there is a possibility that stress corrosion cracking (SCC) may occur in the water pipe.
  • Patent Document 2 since the sensible heat transfer area and the condensation heat transfer area are alternately provided, the structure is complicated and the apparatus increases in size. In addition, since it is feared that the position of the condensation heat transfer area is changed due to a change in boiler load, similarly to Patent Document 1, a zone is generated where the drying and the wetting are repeated, whereby there is a possibility of the stress corrosion cracking being generated.
  • the present invention was made in view of the above circumstances, and an object thereof is to provide a device for recovering residual heat from exhaust gas that has a simple structure and is able to prevent the drying and wetting cycle in the condensation economizer.
  • the device for recovering residual heat from exhaust gas comprises a dry economizer which heats to-be-heated water by utilizing sensible heat of the exhaust gas, the dry economizer being provided in a duct extending to a funnel through which the exhaust gas is emitted to atmosphere; and a condensation economizer which heats to-be-heated water by utilizing latent heat of condensation of the exhaust gas, the condensation economizer being provided on the downstream side of the dry economizer, wherein the duct comprises an upstream duct in which the dry economizer is provided and a downstream duct connected to the upstream duct and directing the exhaust gas to flow upward, and wherein the condensation economizer is arranged in the downstream duct so that temperature of the exhaust gas amounts to condensation temperature at a vicinity of an upper part of the condensation economizer.
  • the condensation economizer is provided in a downstream duct that directs the exhaust gas to flow upward, and the device is configured so that temperature of the exhaust gas amounts to condensation temperature at a vicinity of the upper part of the condensation economizer.
  • vapor in the exhaust gas is condensed in the vicinity of the upper part of the condensation economizer, and becomes a drain (condensed water).
  • the generated drain falls down from vicinity of the upper part of the condensation economizer and comes into contact with the water pipe group constituting the condensation economizer, and thus, the outer wall of the water pipe is kept in a wet state from the upper part to the lower part. For this reason, the drying and wetting cycle is able to be prevented in the water pipe group in the condensation economizer, which is able to prevent the stress corrosion cracking.
  • the device for recovering residual heat from exhaust gas has a configuration in which the upstream duct is provided with the dry economizer and the condensation economizer is provided in the downstream duct which is connected to the upstream duct and directs the exhaust gas to flow upward.
  • the device is able to be simply configured.
  • the device for recovering residual heat further comprises: a white-smoke detector which detects white smoke of the exhaust gas emitted to the atmosphere through the funnel; a heater which heats the exhaust gas on the downstream side of the condensation economizer in a flow direction of the exhaust gas by heat transfer from the exhaust gas in the upstream duct to the downstream side of the condensation economizer; and a heating controller which controls heating condition of the heater based on detection result of the white-smoke detector.
  • a white-smoke detector which detects white smoke of the exhaust gas emitted to the atmosphere through the funnel
  • a heater which heats the exhaust gas on the downstream side of the condensation economizer in a flow direction of the exhaust gas by heat transfer from the exhaust gas in the upstream duct to the downstream side of the condensation economizer
  • a heating controller which controls heating condition of the heater based on detection result of the white-smoke detector.
  • the temperature of the exhaust gas is able to be adjusted so that the white smoke is not generated.
  • the heater may be a gas heater which comprises: a heat recovery section at which residual heat of the exhaust gas is recovered by a heat exchanger plate on the downstream side of the dry economizer in the exhaust gas flow; and a reheating section at which the exhaust gas is reheated on the downstream side of the condensation economizer by the residual heat having been recovered by means of the heat exchanger plate at the heat recovery section, the gas heater rotating the heat exchanger plate so as to be placed in the heat recovery section and the reheating section alternately, and the heating controller may increase the rotational speed of the heat exchanger plate with the increase in concentration of the white smoke based on the detection result of the white-smoke detector.
  • the exhaust gas heat of the upstream duct is able to be transferred to the downstream side of the exhaust gas flow of the condensation economizer and the exhaust gas is able to be reheated on the downstream side of the exhaust gas flow of the condensation economizer, an occurrence of white smoke is able to be suppressed.
  • the exhaust gas heat of the upstream duct to be transferred to the downstream side of the exhaust gas flow of the condensation economizer is able to be obtained by being recovered in the heat recovery section, the temperature of the exhaust gas of the downstream side of the exhaust gas flow of the dry economizer is able to be lowered.
  • the temperature of the exhaust gas is able to be lowered before flowing into the condensation economizer, whereby the exhaust gas is easily condensed by the condensation economizer.
  • the rotational speed of the gas heater is raised with the increase in concentration of the white smoke based on the detection result of the white-smoke detector, the temperature of the exhaust gas is able to be effectively regulated so that white smoke is not generated.
  • the heater may comprise: a bypass channel through which the upstream duct is in communication with the downstream duct so that a portion of the exhaust gas in the upstream duct flows into the downstream side of the condensation economizer; and a damper which adjusts flow rate of the portion of the exhaust gas flowing in the bypass channel, and the heating controller may increase the opening amount of the damper with the increase in concentration of the white smoke based on the detection result of the white-smoke detector.
  • the opening amount of the damper is able to be increased with the increase in concentration of the white smoke based on the detection result of the white-smoke detector, the flow rate of the exhaust gas of the bypass flow channel is able to be adjusted so that the white smoke is not generated.
  • the temperature of the exhaust gas is able to be effectively adjusted.
  • the heater including the bypass channel and the damper has a simple structure and is able to reduce the equipment cost.
  • the device for recovering residual heat may further comprise a spray nozzle which sprays water to the exhaust gas flowing in the condensation economizer, and the water sprayed to the exhaust gas by the spray nozzle may have a temperature between an the inlet temperature and the outlet temperature of the to-be-heated water in the condensation economizer.
  • the temperature of water to be sprayed into the exhaust gas by the spray nozzle is set to a temperature between the inlet temperature and the outlet temperature of the to-be-heated water to the condensation economizer, a decline in condensation efficiency is able to be prevented without rapidly cooling the exhaust gas.
  • the to-be-heated water flows in the dry economizer and the condensation economizer in a direction that is opposite to a direction of the exhaust gas.
  • the condensation economizer is provided in a downstream duct that directs the exhaust gas to flow upward, and the device is configured so that temperature of the exhaust gas amounts to condensation temperature at a vicinity of the upper part of the condensation economizer.
  • vapor in the exhaust gas is condensed in the vicinity of the upper part of the condensation economizer, and becomes a drain.
  • the generated drain falls down from vicinity of the upper part of the condensation economizer and comes into contact with the water pipe group constituting the condensation economizer, and thus, the outer wall of the water pipe is kept in a wet state from the upper part to the lower part. For this reason, the drying and wetting cycle is able to be prevented in the water pipe group in the condensation economizer, which is able to prevent the stress corrosion cracking.
  • the device for recovering residual heat from exhaust gas has a configuration in which the upstream duct is provided with the dry economizer and the condensation economizer is provided in the downstream duct which is connected to the upstream duct and directs the exhaust gas to flow upward.
  • the device is able to be simply configured.
  • FIG. 1 is a schematic configuration diagram that illustrates an example of the device for recovering residual heat from exhaust gas according to a first embodiment.
  • FIGS. 2A to 2C are schematic diagrams that illustrate installation examples of a spray nozzle.
  • FIGS. 3A and 3B are schematic configuration diagrams that illustrate modified examples of the device for recovering residual heat from exhaust gas according to the first embodiment.
  • FIG. 4 is a schematic configuration diagram that illustrates an example of a device for recovering residual heat from exhaust gas according to a second embodiment.
  • FIG. 5 is a schematic configuration diagram that illustrates an example of a device for recovering residual heat from exhaust gas according to a third embodiment.
  • FIG. 1 is a schematic configuration diagram that illustrates an example of the device for recovering residual heat from exhaust gas according to a first embodiment of the present invention.
  • FIG. 2 is a schematic diagram that illustrates an installation example of a spray nozzle provided at the vicinity of a condensation economizer.
  • the device 1 for recovering residual heat from exhaust gas according to the present invention is provided in a duct connected to a funnel 10 that discharges the exhaust gas from a boiler to the atmosphere.
  • the device 1 for recovering residual heat from exhaust gas mainly includes a dry economizer 2 and a condensation economizer 4 .
  • the dry economizer 2 and the condensation economizer 4 include a water pipe through which the to-be-heated water (a boiler water) is circulated.
  • a material of the water pipe preferably uses SUS316L added with molybdenum in austenitic stainless steel from the viewpoint of improving a corrosion resistance.
  • the dry economizer 2 heats the to-be heated water using the sensible heat of the exhaust gas, and is provided on the upstream side (an upstream duct 6 ) of the duct.
  • the exhaust gas subjected to the heat exchange with the to-be-heated water in the dry economizer 2 drops in temperature owing to residual heat recovery.
  • the temperature of the exhaust gas flowing in the dry economizer 2 is 300° C.
  • the temperature of the exhaust gas flowing out of the dry economizer 2 drops to 180° C.
  • the inlet temperature of the to-be-heated water to the dry economizer 2 may be 150° C.
  • the outlet temperature thereof may be 250° C.
  • the condensation economizer 4 is arranged on the downstream side of the dry economizer 2 to heat the to-be-heated water using the latent heat of the condensation of the exhaust gas, and is provided on the downstream side (the downstream duct 8 ) of the duct.
  • the downstream duct 8 is connected to the upstream duct 6 to direct the exhaust gas to flow upward.
  • the condensation economizer 4 is provided so that the exhaust gas amounts to the condensation temperature at the vicinity of the upper part 5 .
  • the condensation temperature of the exhaust gas is 58 to 62° C.
  • another dry economizer which lowers the temperature of the exhaust gas, may be provided on the upstream side of the condensation economizer 4 so that the exhaust gas amounts to the condensation temperature at the vicinity of the upper part 5 of the condensation economizer 4 .
  • the flow direction of the to-be-heated water flowing in the dry economizer 2 and the condensation economizer 4 is provided so as to face the flow direction of the exhaust gas.
  • the device 1 for recovering residual heat from exhaust gas mentioned above is configured such that the condensation economizer 4 is provided in the downstream duct 8 directing the exhaust gas to flow upward, and the exhaust gas amounts to the condensation temperature at the vicinity of the upper part 5 of the condensation economizer 4 .
  • the exhaust gas amounts to the condensation temperature at the vicinity of the upper part 5 of the condensation economizer 4 .
  • vapor in the exhaust gas is condensed at the vicinity of the upper part 5 of the condensation economizer 4 and becomes the drain (the condensed water).
  • the generated drain falls down from the vicinity of the upper part 5 of the condensation economizer and comes into contact with the water pipe group constituting the condensation economizer 4 , the outer wall of the water pipe is kept in the wet state from the upper part to the lower part. For this reason, the drying and wetting cycle is able to be prevented in the water pipe group of the condensation economizer 4 , whereby the stress corrosion cracking is able to be prevented.
  • the generated drain falls down so as to come into contact with the water pipe group and face the exhaust gas of the upward flow when falling down from the vicinity of the upper part 5 of the condensation economizer 4 , it is possible to increase the partial pressure of vapor in the exhaust gas flowing in the condensation economizer 4 . For this reason, the condensation amount in the condensation economizer is increased, the condensation efficiency rises, and the residual heat recovery rate of the exhaust gas rises.
  • the drain comes into contact with the water pipe group of the condensation economizer 4 or the exhaust gas of the upward flow, and then is discharged from the drain outlet 7 .
  • the device 1 for recovering residual heat from exhaust gas of the present embodiment is configured such that the condensation economizer 4 is provided in the upstream duct 6 provided with the dry economizer 2 and in the downstream duct 8 that is connected to the upstream duct 6 and directs the exhaust gas to flow upward, it is possible to easily assemble and manufacture the device for recovering residual heat.
  • the device 1 for recovering residual heat from exhaust gas may include a spray nozzle 9 that sprays water toward the exhaust gas flowing in the condensation economizer 4 .
  • the spray nozzle 9 may be provided on the lower part side (the exhaust gas flow upstream side) of the condensation economizer 4 , and, as shown in FIG. 2B , the spray nozzle 9 may be provided in an inner part of the condensation economizer 4 . Furthermore, as shown in FIG. 2C , the spray nozzle 9 may be provided on an upper part side (the exhaust gas flow downstream side) of the condensation economizer 4 .
  • the temperature of water to be sprayed to the exhaust gas by the spray nozzle 9 is set to a temperature between the inlet temperature and the outlet temperature of the to-be-heated water to the condensation economizer 4 .
  • the temperature of water to be sprayed from the lower part side of the condensation economizer 4 may be 55° C.
  • the temperature of water to be sprayed from the upper part side of the condensation economizer 4 may be 20° C.
  • the temperature of water to be sprayed to the exhaust gas by the spray nozzle is set to the temperature between the inlet temperature and the outlet temperature of the to-be-heated water to the condensation economizer, it is possible to prevent a decline in condensation efficiency without rapidly cooling the exhaust gas.
  • the installation location of the dry economizer 2 is not particularly limited, if the location is within the duct having the exhaust gas flow of one direction flow.
  • FIG. 3 is a schematic configuration diagram that shows a modified example of the device for recovering residual heat from exhaust gas according to the first embodiment, and is an example of an installation location of the dry economizer.
  • the dry economizer 2 may be installed in the upstream duct 6 having the exhaust gas flow of a horizontal direction shown in FIG. 3A and may be installed in the upstream duct 6 having the exhaust gas flow of the upward flow shown in FIG. 3B .
  • FIG. 4 is a schematic configuration diagram that illustrates a device for recovering residual heat from exhaust gas according to a second embodiment.
  • the device 1 for recovering residual heat according to the second embodiment has the same configuration as that of the device 1 for recovering residual heat described in the first embodiment except that white smoke to be discharged from the funnel to the atmosphere is suppressed. For that reason, the detailed description of the same configuration as that of the first embodiment will be omitted.
  • the device 1 for recovering residual heat further includes a white-smoke detector 12 , a heater 14 , and a heating controller 22 , besides the configuration described in FIG. 1 .
  • the white-smoke detector 12 detects the white smoke to be discharged from the funnel 10 to the atmosphere.
  • the white-smoke detector 12 is, for example, a remote surveillance camera provided near the funnel 10 .
  • the white-smoke detector 12 may be a sensor that measures the light transmittance of the exhaust gas.
  • the heater 14 transfers the heat of the exhaust gas of the upstream duct 6 to the downstream side of the exhaust gas flow of the condensation economizer 4 , and heats the exhaust gas of the downstream side of the exhaust gas flow of the condensation economizer 4 .
  • the heater 14 is a gas-gas heater having a heat recovery section 16 and a reheating section 18 .
  • the gas-gas heater 14 transfers the heat of the exhaust gas of the upstream duct 6 to the downstream side of the exhaust gas flow of the condensation economizer 4 by rotating a heat transfer layer plate 20 so that the heat recovery section 16 and the reheating section 18 described later are alternately situated, and heats the exhaust gas of the downstream side of the exhaust gas flow of the condensation economizer 4 .
  • the heat recovery section 16 gives the heat transfer layer plate 20 the residual heat of the exhaust gas on the downstream side of the exhaust gas flow of the dry economizer 2 to recovery the residual heat.
  • the heat of the exhaust gas of the upstream duct 6 to be transferred to the downstream side of the exhaust gas flow of the condensation economizer 4 is obtained by being recovered by the heat recovery section 16 .
  • the exhaust gas subjected to the heat recovery by the heat recovery section 16 is lowered to 60 to 80° C.
  • the reheating section 18 reheats the exhaust gas on the downstream side of the exhaust gas flow of the condensation economizer 4 by the residual heat recovered to the heat transfer layer plate 20 by the heat recovery section 16 .
  • the reheating section 18 reheats the exhaust gas on the downstream side of the exhaust gas flow of the condensation economizer 4 by the residual heat recovered to the heat transfer layer plate 20 by the heat recovery section 16 .
  • the exhaust gas reheated by the reheating section 18 is raised to 80 to 100° C.
  • the heating controller 22 controls the heating state of the heater (the gas-gas heater) 14 based on the detection result of the white-smoke detector 12 .
  • the heating controller 22 may raise the rotational speed of the gas-gas heater 14 with the increase in concentration of the white smoke based on the detection result of the white-smoke detector 12 .
  • the heating controller 22 is a controller, and drives the motor 24 , which rotates the heat transfer layer plate 20 of the gas-gas heater 14 , based on the detection result of the white-smoke detector 12 .
  • FIG. 5 is a schematic configuration diagram that illustrates a device for recovering residual heat from exhaust gas according to the third embodiment.
  • the device 1 for recovering residual heat from exhaust gas according to the third embodiment has the same configuration as the device 1 for recovering residual heat described in the second embodiment except that a bypass channel and a damper are provided instead of the gas-gas heater 14 as the heater, and thus, the detailed description of the same configuration will be omitted.
  • the heater includes a bypass channel 28 and a damper 32 .
  • the bypass channel 28 connects the upstream duct 6 with the downstream duct 8 , and joins a part of the exhaust gas of the upstream duct 6 on the downstream side of the exhaust gas flow of the condensation economizer 4 .
  • the damper 32 controls the flow rate of the exhaust gas of the bypass channel 28 .
  • the heating controller 36 increases the opening amount of the damper 32 with the increase in concentration of the white smoke based on the detection result of the white-smoke detector 12 .
  • the heating controller 36 is a controller, and drives the motor 38 , which operates the damper 32 , based on the detection result of the white-smoke detector 12 .
  • the heater including the bypass channel 28 and the damper 32 has a simple structure, the equipment cost is able to be reduced.
  • the installation locations or the numbers of the bypass channel and the damper are not particularly limited, but the installation locations may be changed and a plurality of them may be provided.
  • a low temperature dry economizer separate from the dry economizer 2 may be provided, and the bypass channel and the damper may be provided on the downstream side of the low temperature dry economizer.
  • a low temperature dry economizer 26 may be further included.
  • a bypass channel 30 may be further included.
  • a damper 34 may be further included.
  • the low temperature dry economizer 26 is arranged in the upstream duct 6 of the downstream side of the dry economizer 2 and performs the residual heat recovery of the exhaust gas in a temperature area of the temperature lower than that of the dry economizer 2 .
  • the low temperature dry economizer 26 may be provided in the temperature area where the exhaust gas subjected to the residual heat recovery by the low temperature dry economizer 26 is lowered to 60 to 80° C.
  • an outlet to-be-heated water of the low temperature dry economizer 26 after the heat exchange may be used as an inlet to-be-heated water of the dry economizer 2 via a deaerator.
  • the bypass channel 30 connects the upstream duct 6 with the downstream duct 8 , and joins a part of the exhaust gas of the downstream side of the low temperature dry economizer 26 on the downstream side of the exhaust gas flow of the condensation economizer 4 .
  • the damper 34 controls the flow rate of the exhaust gas of the bypass channel 30 , that is, the flow rate of the exhaust subjected to the residual heat recovery by the low temperature dry economizer 26 .
  • the opening amount of the damper 34 is increased by driving the motor 40 of the heating controller (controller) 36 with the increase in concentration of the white smoke based on the detection result of the white-smoke detector 12 .
  • the temperature of the exhaust gas of the upstream duct 6 that is joined on the downstream side of the exhaust gas flow of the condensation economizer 4 .
  • a part of the exhaust gas of the downstream side of the low temperature dry economizer 26 may be joined via the bypass channel 30 and the damper 34 .
  • a part of the exhaust gas of the downstream side of the dry economizer 2 having temperature higher than that of the exhaust gas of the downstream side of the low temperature dry economizer 26 may be joined via the bypass channel 28 and the damper 32 .

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chimneys And Flues (AREA)
  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)
US13/805,808 2010-06-25 2011-06-13 Device for recovering residual heat from exhaust gas Abandoned US20130125841A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2010-144718 2010-06-25
JP2010144718A JP5351840B2 (ja) 2010-06-25 2010-06-25 排ガスの余熱回収装置
PCT/JP2011/063463 WO2011162117A1 (ja) 2010-06-25 2011-06-13 排ガスの余熱回収装置

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US (1) US20130125841A1 (ja)
EP (1) EP2587143B1 (ja)
JP (1) JP5351840B2 (ja)
KR (1) KR101364944B1 (ja)
CN (1) CN102918324B (ja)
ES (1) ES2774948T3 (ja)
SA (1) SA111320546B1 (ja)
WO (1) WO2011162117A1 (ja)

Cited By (6)

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US20200232651A1 (en) * 2019-01-23 2020-07-23 Grand Mate Co., Ltd. Oven
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CN114717402A (zh) * 2022-04-06 2022-07-08 江苏中基复合材料有限公司 一种退火炉余热利用与空气净化系统

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SA111320546B1 (ar) 2014-08-25
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CN102918324A (zh) 2013-02-06
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