WO2021085513A1 - Échangeur de chaleur gaz-gaz - Google Patents

Échangeur de chaleur gaz-gaz Download PDF

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Publication number
WO2021085513A1
WO2021085513A1 PCT/JP2020/040533 JP2020040533W WO2021085513A1 WO 2021085513 A1 WO2021085513 A1 WO 2021085513A1 JP 2020040533 W JP2020040533 W JP 2020040533W WO 2021085513 A1 WO2021085513 A1 WO 2021085513A1
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WIPO (PCT)
Prior art keywords
gas
tube
bundle
heat
pipe
Prior art date
Application number
PCT/JP2020/040533
Other languages
English (en)
Japanese (ja)
Inventor
晴治 香川
亮太 落合
隆行 齋藤
石坂　浩
一朗 大森
Original Assignee
三菱パワー株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱パワー株式会社 filed Critical 三菱パワー株式会社
Priority to KR1020227012589A priority Critical patent/KR102704616B1/ko
Priority to CN202080073904.0A priority patent/CN114599928A/zh
Publication of WO2021085513A1 publication Critical patent/WO2021085513A1/fr

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    • 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
    • F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
    • F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
    • 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
    • F23J15/006—Layout of treatment plant
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
    • F23L15/00—Heating of air supplied for combustion
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F1/00—Tubular elements; Assemblies of tubular elements
    • F28F1/10—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses
    • F28F1/12—Tubular elements and assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
    • F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/007—Auxiliary supports for elements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F9/00—Casings; Header boxes; Auxiliary supports for elements; Auxiliary members within casings
    • F28F9/26—Arrangements for connecting different sections of heat-exchange elements, e.g. of radiators

Definitions

  • the present invention relates to a gas gas heat exchanger that exchanges heat between a heat medium and exhaust gas.
  • Patent Document 1 in the exhaust gas treatment system, the gas flow passage of the GGH reheater is divided into an upstream region on the upstream side, a downstream region on the downstream side, and a middle basin region between the upstream region and the downstream region.
  • a configuration is described in which heat exchange bundles (upstream bundle, midstream bundle, and downstream bundle) are arranged in the upstream region, the middle basin region, and the downstream region, respectively.
  • a heat exchange bundle is a structure of a heat transfer tube group in which heat transfer tubes are combined and blocked (unitized) as a constituent unit of a heat transfer tube through which a heat medium flows.
  • Patent Document 1 discloses an example in which each of the upstream bundle, the middle stream bundle, and the downstream bundle is composed of three stages of heat exchange bundles (upper stage bundle, middle stage bundle, and lower stage bundle) that are vertically stacked.
  • the heat transfer tube arrangement pattern of the upstream bundle of the GGH reheater is a staggered arrangement
  • the heat transfer tube arrangement pattern of the middle stream bundle and the downstream bundle is a square arrangement
  • the heat medium passes from the upstream bundle to the downstream bundle.
  • each bundle is configured to be connected so as to flow to the middle-stream bundle.
  • the upstream bundle, the middle stream bundle, and the downstream bundle function as a high temperature preheating section, a low temperature section, and a high temperature section, respectively, and the introduced exhaust gas is a staggered high temperature preheating section and a square low temperature section. Since the temperature is raised in the order of the part and the high temperature part, the efficiency of heat exchange in the GGH reheater can be improved. In addition, the efficiency with which the mist scattered from the wet flue gas desulfurization device collides with the heat transfer tube of the upstream bundle (mist evaporation efficiency in the high temperature preheating part) can be increased, and the mist adheres to the heat transfer tubes in the low temperature part and the high temperature part. It is possible to suppress an increase in pressure loss due to long-term use.
  • an object of the present invention is to provide a gas gas heat exchanger capable of forming a desired heat transfer tube arrangement pattern in a gas flow passage while suppressing an increase in the number of rows of heat exchange bundles along the flow direction of exhaust gas. And.
  • the first aspect of the present invention is to provide a heat exchange bundle composed of a group of heat transfer tubes in which a plurality of linear tube portions of the heat transfer tubes are arranged in a block shape separated from each other on the upstream side of the exhaust gas.
  • This is a gas gas heat exchanger in which a plurality of rows are arranged in series from the side to the downstream side, and a plurality of linear pipe portions are arranged so as to intersect the flow direction of exhaust gas in each of the plurality of rows of heat exchange bundles.
  • the plurality of heat exchange bundles are provided in the first arrangement pipe group in which the piping pattern of the plurality of linear pipe portions in the pipe orthogonal cross section substantially orthogonal to the linear pipe portion is the first arrangement, and on the downstream side of the first arrangement pipe group.
  • a second array tube group which is a second array in which the piping patterns of the plurality of linear tube sections provided are different from the first array, includes a piping pattern mixed bundle provided in the same bundle to form a heat transfer tube group. ..
  • the first arrangement pipe group and the second arrangement pipe group having different piping patterns are provided in one heat exchange bundle, the number of rows of the heat exchange bundle along the flow direction of the exhaust gas can be increased.
  • a desired heat transfer tube arrangement pattern can be formed in the gas flow passage while suppressing the heat transfer tube arrangement pattern.
  • a second aspect of the present invention is arranged as a reheater on the downstream side of the heat recovery device that recovers heat from the exhaust gas and on the downstream side of the desulfurization device that removes sulfur oxides in the exhaust gas by gas-liquid contact.
  • the plurality of heat exchange bundles include a pipe pattern mixed bundle and a downstream heat exchange bundle arranged on the downstream side of the pipe pattern mixed bundle.
  • the first array tube group is a staggered array tube group in which a plurality of linear tube portions are arranged in a staggered manner.
  • the second array tube group is a square array tube group in which a plurality of linear tube portions are arranged in a square grid pattern.
  • a heat medium flows into the zigzag array tube group from the heat recovery device.
  • the staggered arrangement tube group and the heat transfer tube group of the downstream heat exchange bundle are connected by the first connecting tube so that the heat medium flowing through the staggered arrangement tube group flows through the heat transfer tube group of the downstream side heat exchange bundle.
  • the heat transfer tube group and the square array tube group of the downstream heat exchange bundle are connected by a second connecting tube so that the heat medium flowing through the heat transfer tube group of the downstream side heat exchange bundle flows through the square array tube group. ..
  • the staggered arrangement tube group, the square arrangement tube group, and the downstream side heat exchange bundle function as a high temperature preheating part, a low temperature part, and a high temperature part, respectively, and are introduced. Since the exhaust gas flows through the high-temperature preheating part in the staggered arrangement, the low-temperature part and the high-temperature part in the square arrangement in order to raise the temperature, the efficiency of heat exchange in the reheater (gas gas heat exchanger) can be improved.
  • the efficiency at which the mist scattered from the desulfurization device collides with the linear tube portion of the staggered array tube group can be increased, and the mist to the heat transfer tube in the low temperature section and the high temperature section can be increased. Adhesion can be suppressed, and an increase in pressure loss due to long-term use can be suppressed.
  • the third aspect of the present invention is the gas gas heat exchanger of the second aspect, in which the linear tube portion of the staggered arrangement tube group is composed of the bare tube portion of the bare tube specification, and the straight tube portion of the square arrangement tube group.
  • the shape tube portion and the linear tube portion of the downstream heat exchange bundle are composed of a finned pipe portion having a finned pipe specification.
  • the linear tube portion of the staggered array tube group is composed of the bare tube portion of the bare tube specification, the adhesion of mist to the heat transfer tube of the high temperature preheating section is suppressed and the increase in pressure loss due to aged use is suppressed. can do.
  • the linear tube part of the square array tube group and the linear tube part of the downstream heat exchange bundle are composed of the finned tube part of the finned tube specification, the efficiency of heat exchange in the low temperature part and the high temperature part can be improved. Can be enhanced.
  • a fourth aspect of the present invention is the gas gas heat exchanger of the third aspect, in which the fin pitch of the finned tube portion of the linear tube portion of the square array tube group is 5.0 mm or more and 10.0 mm or less. .. Further, the fifth aspect of the present invention is the gas gas heat exchanger of the third or fourth aspect, in which the fin pitch of the finned tube portion of the linear tube portion of the downstream heat exchange bundle is 5.0 mm or more. It is set to 10.0 mm or less.
  • a sixth aspect of the present invention is the gas gas heat exchanger of any one of the second to fifth aspects, in which the flow velocity of the exhaust gas flowing between the linear pipe portions of the staggered arrangement pipe group is 8 m / s or more and 16 m or more.
  • the staggered tube group is arranged so as to be less than / s.
  • the mist removal rate (the removal rate of mist scattered from the desulfurization apparatus) can be increased in the first arrangement tube group (staggered arrangement tube group) on the upstream side in the reheater, and the mist removal performance can be improved. improves. For this reason, corrosion (corrosion due to mist) of the second array pipe group on the downstream side and the linear pipe part of the downstream heat exchange bundle (corrosion by the finned pipe part when the linear pipe part is composed of the finned pipe part). Can be reduced, and stable operation of the gas gas heat exchanger becomes possible.
  • a desired heat transfer tube arrangement pattern can be configured in the gas flow passage while suppressing an increase in the number of rows of heat exchange bundles along the flow direction of exhaust gas.
  • FIG. 1 It is a figure which shows typically the structural example of the exhaust gas treatment system provided with the gas gas heat exchanger which concerns on one Embodiment of this invention. It is a figure which shows typically the flow of the heat medium in the exhaust gas treatment system of FIG. It is a perspective view which shows typically the schematic structure of the GGH reheater of FIG. It is sectional drawing which shows the piping pattern of the linear tube part in the piping pattern mixed bundle of FIG. It is a figure which shows typically the structural example of the flue gas processing stem which divided into two systems of a GGH heat recovery device and a GGH reheater.
  • an example of an air preheater (A / H) 3 and a gas gas heat exchanger (GGH: Gas Gas Heater) is provided in the exhaust gas flow path of the flue gas desulfurization stem (plant) S according to the present embodiment.
  • GGH heat recovery device 4 Dust collector (EP: Electrostatic Precipitator) 5, Fan 6, Wet flue gas desulfurization device (FGD: Flue Gas Desulfurization) 7, GGH reheater 8 as an example of gas gas heat exchanger,
  • the chimney 9 are provided in series, and the exhaust gas from the boiler 1 includes an air preheater 3, a GGH heat collector 4, a dust collector 5, a fan 6, a wet flue gas desulfurization device 7, and a GGH reheater 8.
  • the present invention is applied to the GGH reheater 8, but the present invention may be applied to the GGH heat recovery device 4. Further, the present invention may be applied to the GGH of another system. Further, a denitration device for removing nitrogen oxides in the exhaust gas may be installed between the boiler 1 and the air preheater 3.
  • the exhaust gas is heat-exchanged with the combustion air to the boiler 1.
  • the GGH heat recovery device 4 recovers heat from the exhaust gas, and the dust collector 5 removes most of the soot and dust in the exhaust gas.
  • the fan 6 boosts the exhaust gas, and in the wet flue gas desulfurization apparatus 7, a part of sulfur oxides and soot dust in the exhaust gas is removed by gas-liquid contact.
  • the exhaust gas cooled to the saturated gas temperature in the wet flue gas desulfurization apparatus 7 is heated (heat exchange, reheating) by using the heat recovered by the GGH heat recovery device 4 in the GGH reheater 8. , Is discharged from the chimney 9.
  • the heat transfer tube 11 of the GGH heat recovery device 4 and the heat transfer tube 12 of the GGH reheater 8 are connected by a connecting pipe 13.
  • the connecting pipe 13 is a connecting pipe 13A which is a flow path of the heat medium from the GGH heat recovery device 4 to the GGH reheater 8 and a flow path of the heat medium from the GGH reheater 8 to the GGH heat recovery device 4. It has a connecting pipe 13B.
  • a heat medium circulation pump 14 is provided in the connecting pipe 13, and is a system (heat medium circulation system) in which the heat medium is circulated by the heat medium circulation pump 14.
  • the heat medium circulation system is provided with a heat medium tank 15 for absorbing the expansion of the heat medium in the system.
  • the heat medium temperature is controlled (above a predetermined temperature) in the connecting pipe 13A, which is the flow path of the heat medium from the GGH heat recovery device 4 to the GGH reheater 8, in order to enable stable operation under various conditions.
  • a heat medium heater 16 for controlling is provided.
  • the GGH heat recovery device 4 and the GGH reheater 8 have a housing 31 as a housing.
  • the housing 31 has a bottom plate (lower cover) 32, a back plate (back cover) 33, and a top plate (upper cover) 34.
  • An inter-bundle cover 35 extending in the vertical direction is supported on the front portion of the housing 31.
  • a plurality of bundle-to-bundle covers 35 extend in the vertical direction (vertical direction) and are arranged at a predetermined interval in the left-right direction (exhaust gas flow direction).
  • the area covered by the inter-bundle cover 35 is a space that can be accessed by an operator during inspections, parts replacement, and the like.
  • a plurality of heat exchange bundles 41 are housed inside the housing 31.
  • the heat exchange bundle 41 is a structure of a heat transfer tube group in which heat transfer tubes 11 and 12 are combined and blocked (unitized) as a constituent unit of the heat transfer tubes 11 and 12 through which the heat medium flows.
  • Each heat exchange bundle 41 is composed of a group of heat transfer tubes in which a plurality of linear tube portions 45 of the heat transfer tubes 11 and 12 are arranged in a block shape so as to be separated from each other.
  • a plurality of rows of heat exchange bundles 41 in the housing 31 are arranged in series from the upstream side to the downstream side of the exhaust gas, and in each of the plurality of rows of heat exchange bundles 41, a plurality of linear pipe portions 45 flow the exhaust gas.
  • the exhaust gas flow direction is set to be substantially horizontal (right direction in the figure)
  • the linear pipe portion 45 is linear in the substantially horizontal direction (front-back direction in the figure) so as to be substantially orthogonal to the exhaust gas flow direction. It extends like a shape.
  • Each heat exchange bundle 41 has a first header 42 and a second header 43.
  • the first and second headers 42 and 43 are formed in a columnar shape extending in the vertical direction.
  • Each of the headers 42 and 43 is formed in a shape in which the inside is hollow and the upper and lower ends are closed, and a flowable space is formed inside. Further, mounting plates 44 projecting in the left-right direction are supported on the headers 42 and 43.
  • the linear tube portions 45 of the heat transfer tubes 11 and 12 extending rearward are supported on the rear surfaces of the headers 42 and 43.
  • the heat transfer tubes 11 and 12 are configured to be curved at the rear end or the front end of the linear tube portion 45 so as to reciprocate in the front-rear direction a plurality of times inside the housing 31.
  • a plurality of heat transfer tubes 11 and 12 are supported on the headers 42 and 43 at intervals in the vertical direction. Both ends of the heat transfer tubes 11 and 12 are supported by the headers 42 and 43, and the heat medium can be taken in and out of the heat transfer tubes 11 and 12 from the headers 42 and 43.
  • the linear tube portions 45 of the heat transfer tubes 11 and 12 are supported by the support member 47 at the central portion in the front-rear direction.
  • the support member 47 is formed in a plate in which a plurality of holes through which the heat transfer tubes 11 and 12 pass are formed. Therefore, the heat transfer tubes 11 and 12 are not supported in the cantilever state only by the headers 42 and 43, but are held by the headers 42 and 43 and the support member 47.
  • a plurality of support members 47 may be provided in the front-rear direction depending on the lengths of the heat transfer tubes 11 and 12.
  • a plurality of support members 47 may be provided in the left-right direction.
  • a plug hole 48 is formed in each of the headers 42 and 43 at positions corresponding to the heat transfer tubes 11 and 12.
  • the plug hole 48 is a hole that penetrates in the front-rear direction, and its rear end is connected to the inlet or outlet of the heat transfer tubes 11 and 12. Further, the front end of the plug hole 48 is closed with a plug (not shown) during normal use. If any of the heat transfer tubes 11 and 12 fails and the heat medium leaks out, remove the plug in the plug hole 48 and close the inlet or outlet of the heat transfer tubes 11 and 12 through the plug hole 48 (not shown). It is possible to stop the leakage of the heat medium by closing it.
  • a casing plate 49 is detachably supported between the headers 42 and 43.
  • the casing plate 49 has a height corresponding to the height of the headers 42 and 43 in the vertical direction.
  • the casing plate 49 is detachably supported on the mounting plate 44 by bolts (not shown).
  • the method of detachably fixing the casing plate 49 to the mounting plate 44 is not limited to bolts.
  • the heat exchange bundle 41 is configured so that it can be stored in the housing 31 as one unit.
  • exhaust gas flows inside the bottom plate 32, the back plate 33, the top plate 34, the inter-bundle cover 35, the headers 42, 43, and the casing plate 49.
  • the road is constructed.
  • Heat transfer tubes 11 and 12 are arranged in the gas flow passage so that heat can be exchanged with the exhaust gas flowing through the gas flow passage.
  • the heat exchange bundles 41 are arranged in two rows along the flow direction of the exhaust gas, and the heat exchange bundles 41 are arranged in two rows in the vertical direction in each row.
  • Four heat exchange bundles 41 are provided so as to be stacked in a tier.
  • the two-stage heat exchange bundle 41 on the upstream side constitutes the upstream bundle (upstream heat exchange bundle) 41A
  • the two-stage heat exchange bundle 41 on the downstream side each constitutes the downstream bundle (downstream heat exchange bundle). ) 41B is configured.
  • the lower ends of the headers 42 and 43 of the upper heat exchange bundle 41 are directly stacked on the upper end of the lower heat exchange bundle 41 and fixed with bolts (not shown).
  • the two-stage heat exchange bundle 41 on the upstream side may be collectively referred to as the upstream bundle 41A
  • the two-stage heat exchange bundle 41 on the downstream side may be collectively referred to as the downstream bundle 41B.
  • the number of rows of the heat exchange bundle 41 may be 3 or more
  • the number of stages of the heat exchange bundle 41 in each row is 1 stage (1 row is composed of a single heat exchange bundle 41) or 3 or more stages. There may be.
  • the upstream bundle 41A and the downstream bundle 41B of the GGH heat recovery device 4 are connected at each part by a connecting pipe 61, and a heat medium is provided between the upstream bundle 41A and the downstream bundle 41B.
  • a heat medium is provided between the upstream bundle 41A and the downstream bundle 41B.
  • the GGH heat recovery device 4 of the present embodiment is configured so that the heat medium flows from the downstream bundle 41B to the upstream bundle 41A.
  • the heat medium flows from the downstream bundle 41B to the upstream bundle 41A because the temperature difference from the exhaust gas cooled by heat exchange in the upstream bundle 41A becomes small and the efficiency of heat exchange decreases. It is configured as follows.
  • the upstream bundle 41A of the GGH reheater 8 is configured as a piping pattern mixed bundle.
  • the pipe pattern mixed bundle is a heat exchange bundle 41 configured so that the pipe patterns of a plurality of linear pipe portions 45 in a pipe orthogonal cross section substantially orthogonal to the linear pipe portion 45 are different on the upstream side and the downstream side.
  • the upstream bundle 41A shown in FIG. 4 of the 10 rows of linear pipes 45 arranged in the gas flow direction, the two rows on the upstream side are arranged in a staggered pattern (first array pipe group).
  • the number is 51, and the group of square arrangement pipes (second arrangement pipe group having a piping pattern different from that of the first arrangement pipe group) 52 in which eight rows on the downstream side are arranged in a square grid pattern is used.
  • the downstream bundle 41B of the GGH reheater 8 of the present embodiment is configured as a piping pattern non-mixed bundle (pipe pattern single bundle).
  • the pipe pattern non-mixed bundle is a heat transfer tube bundle 41 set in the same pipe pattern (square arrangement in this embodiment) in the entire area (all rows) from the upstream side to the downstream side.
  • the upstream bundle 41A and the downstream bundle 41B of the GGH heat recovery device 4 of the present embodiment are all in the entire area (all rows) from the upstream side to the downstream side, similarly to the downstream bundle 41B of the GGH reheater 8.
  • a pipe pattern non-mixed bundle composed of the same pipe pattern (square arrangement in this embodiment).
  • the exhaust gas comes into contact with the linear pipe 45 in the most upstream row of the plurality of rows, but on the downstream side thereof, the linear pipes 45 in the second and subsequent rows are in the most upstream row with respect to the flow direction of the exhaust gas. Since it is hidden behind the linear pipe 45, the contact with the exhaust gas is reduced, and the contact is reduced, so that the exhaust gas easily flows.
  • the linear pipes 45 in the second and subsequent rows are less likely to be behind the linear pipes 45 in the front row (first row in this embodiment), and the exhaust gas is generated.
  • the number of contacts increases, but it becomes a resistance to the exhaust gas.
  • the exhaust gas is rectified because it becomes a resistance to the exhaust gas.
  • the heat medium flowing out from the GGH heat recovery device 4 flows through the connecting pipe 13A and flows into the heat medium inlet of the staggered arrangement pipe group 51.
  • the heat medium outlet of the staggered arrangement tube group 51 and the heat medium inlet of the heat transfer tube group of the downstream bundle 41B are such that the heat medium flowing through the staggered arrangement tube group 51 flows through the heat transfer tube group of the downstream bundle 41B. It is connected by a first connecting pipe 62.
  • the heat medium outlet of the heat transfer tube group of the downstream bundle 41B and the heat medium inlet of the square array tube group 52 are such that the heat medium flowing through the heat transfer tube group of the downstream bundle 41B flows through the square array tube group 52.
  • the staggered array tube group 51, the square array tube group 52, and the downstream bundle 41B function as a high temperature preheating section, a low temperature section, and a high temperature section, respectively, and are introduced.
  • the exhaust gas flows through the high-temperature preheating part in the staggered arrangement, the low-temperature part and the high-temperature part in the square arrangement in order to raise the temperature.
  • the temperature of the heat medium becomes higher in the downstream side than in the middle flow.
  • the exhaust gas is warmed by the high temperature middle stream and then passes through the low temperature downstream, so that the exhaust gas is hard to warm in the downstream stream and the heat exchange efficiency is low.
  • the temperature of the heat medium is higher in the downstream than in the middle stream as in the present embodiment, the exhaust gas is warmed in the order of the low temperature middle stream to the high temperature downstream, so that the efficiency of heat exchange is improved. ..
  • the linear tube portion 45 of the heat transfer tube 11 is provided with a fin having a large number of fold-shaped fins. It consists of a tube part.
  • the linear tube portion 45 of the staggered arrangement tube group 51 is composed of a bare tube portion, and the linear tube portion 45 of the square arrangement tube group 52 and the linear tube portion of the downstream bundle 41B. 45 is composed of a pipe portion with fins.
  • the linear pipe portion 45 of the staggered arrangement pipe group 51 is composed of a pipe portion with fins, mist from the wet flue gas desulfurization apparatus 7 adheres and is easily corroded. Since the linear tube portion 45 is composed of a bare tube portion, it is less likely to corrode than a case where the linear tube portion 45 is composed of a tube portion with fins.
  • the square arrangement reduces ash erosion (a phenomenon in which the surface of the heat transfer tube is roughened or scraped by coal ash in the exhaust gas).
  • ash erosion a phenomenon in which the surface of the heat transfer tube is roughened or scraped by coal ash in the exhaust gas.
  • contact with the exhaust gas is ensured by forming the tube portion with fins.
  • tube group 51 of the GGH reheater 8 mist from the wet flue gas desulfurization apparatus 7 easily flows in, and the staggered arrangement increases the contact probability with the mist and facilitates the removal of the mist. There is.
  • the mist removal efficiency in the staggered arrangement pipe group 51 on the upstream side of the finned pipe portion is 60%.
  • the gas flow velocity flowing between the linear pipe portions (bare pipe portions in the present embodiment) 45 of the staggered arrangement tube group 51 should be in the range of 8 m / s to 16 m / s. It is preferable to arrange the linear tube portion (bare tube portion) 45 of the staggered arrangement tube group 51.
  • the fin pitch of the finned pipe portion of the GGH reheater 8 (the finned pipe portion of at least one of the square array pipe group 52 and the downstream bundle 41B) to 5.0 mm to 10.0 mm, the fins are attached.
  • the problem that the pipe part is clogged with dust over time is solved, and more stable operation becomes possible.
  • the first arrangement tube group staggered arrangement tube group having different piping patterns in one heat exchange bundle 41 (upstream side bundle 41A).
  • 51 and the second arrangement tube group (square arrangement tube group) 52 are provided, so that a desired heat transfer tube arrangement pattern can be obtained while suppressing an increase in the number of rows of the heat exchange bundle 41 along the flow direction of the exhaust gas. It can be configured as a gas flow passage.
  • the staggered tube group 51, the square tube group 52, and the downstream bundle 41B function as a high temperature preheating section, a low temperature section, and a high temperature section, respectively, and the introduced exhaust gas. Is able to improve the efficiency of heat exchange in the GGH reheater 8 because the high temperature preheating part in the staggered arrangement, the low temperature part and the high temperature part in the square arrangement are sequentially circulated to raise the temperature.
  • the efficiency at which the mist scattered from the wet flue gas desulfurization apparatus 7 collides with the linear tube portion 45 of the staggered array tube group 51 can be increased, and the low temperature section and the high temperature section can be increased. Adhesion of mist to the heat transfer tube 12 can be suppressed, and an increase in pressure loss due to long-term use can be suppressed.
  • the linear tube portion 45 of the staggered array tube group 51 is composed of a bare tube portion, it is possible to suppress the adhesion of mist to the heat transfer tube 12 of the high temperature preheating section and suppress the increase in pressure loss due to aged use. it can. Further, since the linear tube portion 45 of the square array tube group 52 and the linear tube portion 45 of the downstream bundle 41B are composed of the tube portion with fins, the efficiency of heat exchange in the low temperature portion and the high temperature portion can be improved. it can.
  • the present invention is not limited to the above-described embodiment and modification described as an example, and is not limited to the above-described embodiment and the like as long as it does not deviate from the technical idea of the present invention. , Various changes are possible depending on the design and the like.
  • the present invention is applied to a smoke exhaust treatment stem S in which the GGH heat recovery device 4 and the GGH reheater 8 are divided into a plurality of systems (two systems in the example of FIG. 5), and a plurality of GGH At least one of the heat recovery devices 4 and at least one of the plurality of GGH reheaters 8 may be configured as in the above embodiment.
  • the exhaust gas flow direction is set to a substantially horizontal direction
  • the direction in which the linear pipe portion 45 extends is set to a substantially horizontal direction substantially orthogonal to the exhaust gas flow direction.
  • the extending direction of the linear pipe portion 45 is not limited to the above, and is set to another direction (the exhaust gas flow direction is set to be substantially horizontal, and the extending direction of the linear pipe portion 45 is set to the vertical direction (approximately vertical direction). ) May be set.
  • Boiler 3 Air preheater (A / H) 4: GGH heat recovery device (gas gas heat exchanger) 5: Dust collector (EP) 6: Fan 7: Wet flue gas desulfurization device 8: GGH reheater (gas gas heat exchanger) 9: Chimneys 11, 12: Heat transfer tubes 13, 13A, 13B: Connecting pipe 31: Housing 41: Heat exchange bundle 41A: Upstream bundle (upstream heat exchange bundle, piping pattern mixed bundle) 41B: Downstream bundle (downstream heat exchange bundle) 42: First header 43: Second header 45: Straight pipe portion 49: Casing plate 51: Staggered arrangement pipe group (first arrangement pipe group) 52: Square array tube group (second array tube group) 61: Connection pipe S: Smoke exhaust treatment system

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Geometry (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Treating Waste Gases (AREA)
  • Chimneys And Flues (AREA)

Abstract

Selon la présente invention, une pluralité de colonnes de faisceaux d'échange de chaleur (41) est formée par des groupes de tubes de transfert de chaleur dans lesquels plusieurs parties tubulaires linéaires (45) des tubes de transfert de chaleur (12) sont disposées côte à côte formant des blocs séparés les uns des autres. Les faisceaux d'échange de chaleur sont disposés en agencement en série en une pluralité de colonnes, du côté amont des gaz d'échappement vers le côté aval. Dans chaque colonne parmi la pluralité de colonnes des faisceaux d'échange de chaleur (41), la pluralité de parties tubulaires linéaires (45) est disposée de manière à croiser la direction d'écoulement du gaz d'échappement. La pluralité de faisceaux d'échange de chaleur (41) comprend un faisceau hybride (41A) à configuration tubulaire, dans lequel un premier groupe (51) des tubes du groupement, dont la configuration tubulaire de la pluralité de parties tubulaires linéaires (45), dans une section transversale orthogonale des tubes sensiblement orthogonale aux parties tubulaires linéaires (45), est un premier groupement, et un second groupe des tubes du groupement, dont la configuration tubulaire de la pluralité de parties tubulaires linéaires disposées du côté aval du premier groupe de tubes du groupement est un second groupement différent du premier groupement, sont disposés dans le même faisceau et forment un groupe de tubes de transfert de chaleur.
PCT/JP2020/040533 2019-10-31 2020-10-28 Échangeur de chaleur gaz-gaz WO2021085513A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
KR1020227012589A KR102704616B1 (ko) 2019-10-31 2020-10-28 가스 가스 열교환기
CN202080073904.0A CN114599928A (zh) 2019-10-31 2020-10-28 气气热交换器

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2019-199402 2019-10-31
JP2019199402A JP7334105B2 (ja) 2019-10-31 2019-10-31 ガスガス熱交換器

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WO2021085513A1 true WO2021085513A1 (fr) 2021-05-06

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JP (1) JP7334105B2 (fr)
KR (1) KR102704616B1 (fr)
CN (1) CN114599928A (fr)
TW (1) TWI757942B (fr)
WO (1) WO2021085513A1 (fr)

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KR20230038760A (ko) * 2021-02-01 2023-03-21 미츠비시 파워 가부시키가이샤 열교환기 및 배연 처리 시스템

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001065801A (ja) * 1999-08-24 2001-03-16 Hitachi Ltd 熱交換器及びボイラ
WO2004042280A1 (fr) * 2002-11-05 2004-05-21 Babcock-Hitachi Kabushiki Kaisha Dispositif de traitement de gaz d'echappement
WO2007079140A2 (fr) * 2005-12-28 2007-07-12 Wabtec Holding Corp. Configuration d'échangeur thermique multifluide
WO2018139669A1 (fr) * 2017-01-30 2018-08-02 三菱日立パワーシステムズ株式会社 Échangeur de chaleur gaz-gaz

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000161647A (ja) * 1998-12-01 2000-06-16 Babcock Hitachi Kk 排ガス処理装置とガス再加熱器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2001065801A (ja) * 1999-08-24 2001-03-16 Hitachi Ltd 熱交換器及びボイラ
WO2004042280A1 (fr) * 2002-11-05 2004-05-21 Babcock-Hitachi Kabushiki Kaisha Dispositif de traitement de gaz d'echappement
WO2007079140A2 (fr) * 2005-12-28 2007-07-12 Wabtec Holding Corp. Configuration d'échangeur thermique multifluide
WO2018139669A1 (fr) * 2017-01-30 2018-08-02 三菱日立パワーシステムズ株式会社 Échangeur de chaleur gaz-gaz

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JP7334105B2 (ja) 2023-08-28
TW202124898A (zh) 2021-07-01
TWI757942B (zh) 2022-03-11
CN114599928A (zh) 2022-06-07
KR20220061236A (ko) 2022-05-12
JP2021071263A (ja) 2021-05-06
KR102704616B1 (ko) 2024-09-06

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