US20130327510A1 - Heat exchanger - Google Patents
Heat exchanger Download PDFInfo
- Publication number
- US20130327510A1 US20130327510A1 US14/001,558 US201114001558A US2013327510A1 US 20130327510 A1 US20130327510 A1 US 20130327510A1 US 201114001558 A US201114001558 A US 201114001558A US 2013327510 A1 US2013327510 A1 US 2013327510A1
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- US
- United States
- Prior art keywords
- transfer tube
- heat transfer
- bundle
- heat
- flue gas
- Prior art date
- Legal status (The legal status 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 status listed.)
- Abandoned
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Classifications
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- 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
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- 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
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- 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
- F23J15/08—Arrangements of devices for treating smoke or fumes of heaters
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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
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
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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
- F28D7/1615—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 the conduits being inside a casing and extending at an angle to the longitudinal axis of the casing; the conduits crossing the conduit for the other heat exchange medium
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G15/00—Details
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F2280/00—Mounting arrangements; Arrangements for facilitating assembling or disassembling of heat exchanger parts
- F28F2280/02—Removable elements
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- 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 heat exchanger in an air pollution control system.
- an air pollution control apparatus of a boiler for thermal power plant or chemical plant is disposed in order of denitrification equipment in a flue gas flow channel, an air-preheater air heater, a heat recovery unit of reheating gas-gas heater, a dry electronic precipitator, wet desulfurization equipment, a reheating unit for the gas-gas heater, and a chimney.
- the gas-gas heater is configured such that the heat recovery unit and the reheating unit are connected to a cool and hot water circulating line to perform a heat exchange with a flue gas through a circulating pump using water as a medium.
- the flue gas of the boiler is guided to the air heater to be cooled to a temperature of, for example, 130 to 150° C. by exchanging heat with combustion air and then is guided to the heat recovery unit of the gas-gas heater to be further cooled. Thereafter, after the flue gas is guided to the electronic precipitator to remove fly ashes, a high-temperature flue gas in an outlet of the electronic precipitator is further cooled to a low temperature by exchanging heat with water and then is guided to the wet desulfurization equipment.
- SO 2 contained in the flue gas is absorbed and removed by absorbent which is prepared by dissolving, for example, limestone in the form of slurry and remaining fly ashes in the flue gas are also removed in the gas-solution contact process. Then, the flue gas in which SO 2 and the fly ashes are removed is guided to the reheating unit of the gas-gas heater.
- the temperature of the flue gas temperature-dropped by SO 2 absorbent and the like in the treatment process of the wet desulfurization equipment is raised by the heat exchange with heat medium water passing through an interior of a pipe disposed in the reheating unit of the gas-gas heater. This causes functions of preventing white smoke generation due to a reduction of the amount of water condensation and improving diffusion efficiency due to temperature rise, when the flue gas is released from the chimney to an atmosphere.
- a fin tube heat exchanger has been proposed as a heat exchange method of large-scaled heat recovery unit and reheating unit of the gas-gas heater in coal-fired power plant (Patent Literature 1).
- Patent Literature 1 Japanese Laid-open Patent Publication No. 11-304138
- a heat exchanger including: a heat transfer tube bundle housing duct for housing heat transfer tube bundles; openings provided on a sidewall of the heat transfer tube bundle housing duct, for freely inserting and removing the heat transfer tube bundles; and rails provided in a direction perpendicular to an inflowing direction of a flue gas within the heat transfer tube bundle housing duct, for freely moving the heat transfer tube bundles.
- the heat exchanger according to the first aspect, further including: temporary support parts provided in a structure outside the heat transfer tube bundle housing duct; moving rails supported by the temporary support parts, for moving the heat transfer tube bundles; and a driving apparatus for drawing out the heat transfer tube bundles on the moving rails.
- FIG. 1-1 is a schematic view of a heat exchanger.
- FIG. 1-2 is a schematic view of the heat exchanger.
- FIG. 2-1 is a perspective view illustrating schematically an exterior of a heat exchanger according to a first embodiment.
- FIG. 2-2 is a perspective view illustrating schematically the exterior of the heat exchanger according to the first embodiment.
- FIG. 3 is a perspective view illustrating schematically an exterior of a heat exchanger according to a second embodiment.
- FIG. 4 is a schematic view illustrating main parts of FIG. 3 .
- FIG. 5 is a schematic view illustrating parts other than the main parts of FIG. 3 .
- FIG. 6 is a schematic view of an air pollution control system to which the heat exchangers according to the embodiments are applied.
- FIG. 7 is a schematic view of the heat exchanger of an air pollution control installation.
- FIG. 6 is a schematic view of an air pollution control system to which heat exchangers according to the present embodiment are applied.
- an air pollution control system 100 removes nitride oxide (NOx), soot dust, and sulfur oxide (SOx) contained in the flue gas.
- a flue gas G o discharged from the boiler 101 is introduced into denitrification equipment 102 filled with a catalyst.
- the nitrogen oxide contained in the flue gas G 0 is reduced to water and nitrogen by ammonia (NH 3 ) injected as a reducing agent to become harmless.
- a flue gas G 1 discharged from the denitrification equipment 102 is generally cooled to the temperature of 130° C. to 150° C. through an air heater (AH) 103 .
- a flue gas G 2 passed through the air heater 103 is introduced into a heat recovery unit 104 serving as a heat exchanger of gas-gas heater and then is heat-recovered by a heat exchange with a heat medium (for example, water).
- a heat medium for example, water
- the flue gas G 3 passed through the heat recovery unit 104 is introduced into the electronic precipitator 105 and then the shoot dust therein is removed.
- a flue gas G 4 passed through the electronic precipitator 105 is pressurized by an air blower 106 to be driven by an electric motor.
- the air blower 106 may not be provided, or may be disposed on a downstream side of a reheating unit 108 of the gas-gas heater.
- FIG. 7 is a schematic view of a heat exchanger of an air pollution control installation.
- the heat exchanger into which the flue gas G 2 is introduced to exchange heat with the heat medium 83 is provided.
- the heat exchanger has the circulating pipe 110 for circulating the heat medium 83 between the heat recovery unit 104 and the reheating unit 108 .
- the heat medium 83 is circulated between the heat recovery unit 104 and the reheating unit 108 through the circulating pipe 110 .
- a surface of the heat medium circulating passage 110 provided in each of the heat recovery unit 104 and the reheating unit 108 is provided with a heat transfer tube 11 on which a plurality of fins are provided.
- a heat exchanging unit 86 is provided in the heat medium circulating passage 110 to compensate energy, which is equivalent to temperature drop absorbed by radiant heat when the heat medium 83 is circulated, by heating with a steam 87 and to be capable of maintaining and adjusting a medium temperature of the heat medium 83 .
- the heat medium 83 is supplied to the heat medium circulating passage 110 from a heat medium tank 88 .
- the heat medium 83 is circulated in the circulating passage 110 by the heat medium circulating pump 109 .
- a supply quantity of the steam 87 is adjusted by an adjusting valve V 1 according to the gas temperature of the purified gas G 6 from the desulfurization equipment 107
- the heat medium 83 to be fed into the reheating unit 108 is supplied to the heat recovery unit 104 by an adjusting valve V 2 according to the gas temperature of the flue gas G 3 discharged from the heat recovery unit 104 , and thus a supply quantity of the heat medium 83 to be fed into the reheating unit 108 is adjusted.
- the purified gas G 7 discharged from the reheating unit 108 is discharged from the chimney 111 to the outside.
- FIGS. 1-1 and 1 - 2 are a schematic view of the heat exchanger, respectively.
- the heat exchanger includes a heat transfer tube bundle housing duct 20 in which a plurality of heat transfer tube bundles, that is, a high-temperature heat transfer tube bundle 22 A, a middle-temperature heat transfer tube bundle 22 B, and a low-temperature heat transfer tube bundle 22 C are disposed from an upstream side in an inflowing direction of the flue gas, the heat transfer tube bundles being an aggregation which binds together the heat transfer tube bundles.
- the plurality of heat transfer tube bundles 22 A 22 A 1 to 22 A 3 ) , 22 B ( 22 B 1 to 22 B 3 ) , and 22 C ( 22 C 1 to 22 C 3 ) are disposed with a predetermined interval to perform the heat recovery or the heat exchange in a gas flowing direction of the flue gas.
- the flue gas G, a duct inlet part 20 a, and an expanded part 20 b are illustrated.
- an upstream side in a flue gas introducing direction of the heat transfer tube bundle is a front 22 a
- a downstream side in the flue gas introducing direction is a rear 22 b.
- an X-direction is the flue gas flowing direction
- a Y-direction is an insertion direction of the heat transfer tube bundle
- a Z-direction is a stacked installation direction of the heat transfer tube bundle.
- FIGS. 2-1 and 2 - 2 are perspective views illustrating schematically an exterior of the heat exchanger according to the first embodiment.
- the heat exchanger includes the heat transfer tube bundle housing duct (hereinafter, referred to as a “bundle housing duct”) 20 which houses heat transfer tube bundles 22 , openings 26 which are provided on a sidewall of the heat transfer tube bundle housing duct 20 to freely insert and remove the heat transfer tube bundles 22 , and bottom rails 27 which are provided in a direction perpendicular to the inflowing direction of the flue gas G within the bundle housing duct 20 to freely move the heat transfer tube bundles.
- a “bundle housing duct” 20 which houses heat transfer tube bundles 22 , openings 26 which are provided on a sidewall of the heat transfer tube bundle housing duct 20 to freely insert and remove the heat transfer tube bundles 22 , and bottom rails 27 which are provided in a direction perpendicular to the inflowing direction of the flue gas G within the bundle housing duct 20 to freely move the heat transfer tube bundles.
- a reference numeral 25 indicates a handrail provided in a framework stage through which persons come and go.
- the handrail 25 is vertically stood so that persons do not fall down, but is configured such that the bundles can pass through, as illustrated in FIG. 2-1 , since the handrail 25 is provided with a hinge which is movable so as to recline in a horizontal position at the time of taking the heat transfer tube bundles 22 in and out.
- a floor 25 a of the handrail is configured so as to temporarily place the heat transfer tube bundles 22 when the handrail 25 is reclined.
- the heat transfer tube bundle 20 is set to be drawn out in following manners.
- heat transfer tube bundle 22 C 3 In a case of drawing out a specified heat transfer tube bundle (for example, heat transfer tube bundle 22 C 3 ), firstly, the opening 26 is opened and the handrail 25 is reclined. 2) Then, the heat transfer tube bundle 22 C 3 , which is ranging from 20 to 30 tons per one bundle, is drawn out from the opening 25 while being supported with a crane 23 .
- a specified heat transfer tube bundle for example, heat transfer tube bundle 22 C 3
- the bundle-bottom-rail 27 is installed at a position corresponding to a lower part of each bundle in a longitudinal direction inside the duct from a sidewall side to draw out and move the bundle toward the opening, the heat transfer tube bundle is easily drawn out in the longitudinal direction toward the opening of the sidewall on the bundle-bottom-rail 27 .
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Chimneys And Flues (AREA)
- Treating Waste Gases (AREA)
- Air Supply (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
Abstract
A heat exchanger is provided with a heat transfer tube bundle housing duct for housing heat transfer tube bundles, openings provided on a sidewall of the heat transfer tube bundle housing duct, for freely inserting and removing the heat transfer tube bundles, and rails provided in a direction perpendicular to an inflowing direction of a flue gas G within the heat transfer tube bundle housing duct, for freely moving the heat transfer tube bundles. Since the heat exchanger can draw out only a specific heat transfer tube bundle, it is possible to reduce a maintenance period, thereby minimizing a regular inspection period.
Description
- The present invention relates to a heat exchanger in an air pollution control system.
- As a general example of a system configuration, an air pollution control apparatus of a boiler for thermal power plant or chemical plant is disposed in order of denitrification equipment in a flue gas flow channel, an air-preheater air heater, a heat recovery unit of reheating gas-gas heater, a dry electronic precipitator, wet desulfurization equipment, a reheating unit for the gas-gas heater, and a chimney. Here, the gas-gas heater is configured such that the heat recovery unit and the reheating unit are connected to a cool and hot water circulating line to perform a heat exchange with a flue gas through a circulating pump using water as a medium.
- In this control apparatus, the flue gas of the boiler is guided to the air heater to be cooled to a temperature of, for example, 130 to 150° C. by exchanging heat with combustion air and then is guided to the heat recovery unit of the gas-gas heater to be further cooled. Thereafter, after the flue gas is guided to the electronic precipitator to remove fly ashes, a high-temperature flue gas in an outlet of the electronic precipitator is further cooled to a low temperature by exchanging heat with water and then is guided to the wet desulfurization equipment. In the wet desulfurization equipment, SO2 contained in the flue gas is absorbed and removed by absorbent which is prepared by dissolving, for example, limestone in the form of slurry and remaining fly ashes in the flue gas are also removed in the gas-solution contact process. Then, the flue gas in which SO2 and the fly ashes are removed is guided to the reheating unit of the gas-gas heater. Here, the temperature of the flue gas temperature-dropped by SO2 absorbent and the like in the treatment process of the wet desulfurization equipment is raised by the heat exchange with heat medium water passing through an interior of a pipe disposed in the reheating unit of the gas-gas heater. This causes functions of preventing white smoke generation due to a reduction of the amount of water condensation and improving diffusion efficiency due to temperature rise, when the flue gas is released from the chimney to an atmosphere.
- For example, a fin tube heat exchanger has been proposed as a heat exchange method of large-scaled heat recovery unit and reheating unit of the gas-gas heater in coal-fired power plant (Patent Literature 1).
- Patent Literature 1: Japanese Laid-open Patent Publication No. 11-304138
- In a case of performing maintenance of heat transfer bundles in a heat exchanger, however, following problems occur.
- 1) In a case where wear over time occurs due to blast effect of combustion fly ashes to a heat transfer tube of a fin tube heat exchanger in a thermal power plant, or in a case where the composition of the same ashes has adhesive properties and corrosive properties, the ashes are fixed to a heat transfer surface to proceed corrosion of the heat transfer tube, a thickness of the tube is decreased with time.
- When an unplanned stop is caused by massive update or maintenance of the bundles, damage of power sales occurs due to inhibition of a commercial operation. For this reason, leakage of heat medium water has been a very important issue.
- 2) Further, the plant operation is stopped to repair in a case where the number of leakage locations is large in leakage inspection during operating or in a case where extensive repairs or bundle updates are determined to be necessary.
- 3) In the related art, in order to draw out a lower bundle, large-scaled module bundles ranging from, for example, 20 to 30 tons per one bundle are lifted one by one in turns from an upper-stage bundle by a crane from openings installed at an upper part of a duct for storing the bundles of the heat exchanger.
- Therefore, it is necessary to draw out even robust bundles that do not require the maintenance.
- Further, in case of requiring a bundle inspection work such as, for example, a residual wall thickness inspection in the interior of the duct, it is necessary to temporarily install an entire-face scaffold on front and rear of all target bundles inside the duct, and a large amount of cost and considerable period are consumed for this.
- 4) In this case, considerable period is required for a massive repairs or updates of the bundles, and the damage of power sales occurs due to the inhibition of the commercial operation during existence of risks for delaying a regular inspection period of the power plant.
- 5) Further, in a case of performing the massive repair of the lower-stage side bundle, it is necessary to temporarily place the robust bundle in an open space until re-storing in the duct of which the repair is completed. In this case, it is necessary to ensure the period of this placed space, and the damage risk of the placement space is also generated by curing deficiency depending on weather environment when the temporary placement space is an outdoor space.
- In addition, there is a problem that management costs increase even in a curing or an indoor storage.
- The present invention has been achieved to solve the above problems, and an object of the present invention is to provide a heat exchanger that can draw out only a specific heat transfer tube bundle to improve work efficiency.
- According to a first aspect of the present invention in order to solve the above-mentioned problems, there is provided a heat exchanger, including: a heat transfer tube bundle housing duct for housing heat transfer tube bundles; openings provided on a sidewall of the heat transfer tube bundle housing duct, for freely inserting and removing the heat transfer tube bundles; and rails provided in a direction perpendicular to an inflowing direction of a flue gas within the heat transfer tube bundle housing duct, for freely moving the heat transfer tube bundles.
- According to a second aspect of the present invention, there is provided the heat exchanger according to the first aspect, including: bundle-bottom-rails provided in the openings, for drawing out and moving the heat transfer tube bundles from a sidewall side in a direction perpendicular to a flue gas direction within the heat transfer tube bundle housing duct.
- According to a third aspect of the present invention, there is provided the heat exchanger according to the first aspect, further including: temporary support parts provided in a structure outside the heat transfer tube bundle housing duct; moving rails supported by the temporary support parts, for moving the heat transfer tube bundles; and a driving apparatus for drawing out the heat transfer tube bundles on the moving rails.
- According to a fourth aspect of the present invention, there is provided the heat exchanger according to the third aspect, including: bundle-bottom-rail provided in the openings, for drawing out and moving the heat transfer tube bundles from the sidewall side in a direction perpendicular to a flue gas direction within the heat transfer tube bundle housing duct.
- According to a fifth aspect of the present invention, there is provided the heat exchanger according to the fourth aspect, including: back rails provided at back sides of the heat transfer tube bundles, the back side coming in contact with the bundle-bottom-rail.
- According to the present invention, since only a specific heat transfer tube bundle can be drawn out, it is possible to reduce a maintenance period, thereby minimizing a regular inspection period.
-
FIG. 1-1 is a schematic view of a heat exchanger. -
FIG. 1-2 is a schematic view of the heat exchanger. -
FIG. 2-1 is a perspective view illustrating schematically an exterior of a heat exchanger according to a first embodiment. -
FIG. 2-2 is a perspective view illustrating schematically the exterior of the heat exchanger according to the first embodiment. -
FIG. 3 is a perspective view illustrating schematically an exterior of a heat exchanger according to a second embodiment. -
FIG. 4 is a schematic view illustrating main parts ofFIG. 3 . -
FIG. 5 is a schematic view illustrating parts other than the main parts ofFIG. 3 . -
FIG. 6 is a schematic view of an air pollution control system to which the heat exchangers according to the embodiments are applied. -
FIG. 7 is a schematic view of the heat exchanger of an air pollution control installation. - Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. The present invention is not limited to the following embodiments, but may be constituted in combination with each of embodiments in case of several embodiments. In addition, constituent elements in the following embodiments include those that can be easily assumed by persons skilled in the art or that are substantially equivalent.
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FIG. 6 is a schematic view of an air pollution control system to which heat exchangers according to the present embodiment are applied. - In a process where a flue gas to be discharged from a
boiler 101 of power plants, factories or the like is released from achimney 111, as illustrated inFIG. 6 , an airpollution control system 100 removes nitride oxide (NOx), soot dust, and sulfur oxide (SOx) contained in the flue gas. - Firstly, a flue gas Go discharged from the
boiler 101 is introduced intodenitrification equipment 102 filled with a catalyst. In thedenitrification equipment 102, the nitrogen oxide contained in the flue gas G0 is reduced to water and nitrogen by ammonia (NH3) injected as a reducing agent to become harmless. - A flue gas G1 discharged from the
denitrification equipment 102 is generally cooled to the temperature of 130° C. to 150° C. through an air heater (AH) 103. - A flue gas G2 passed through the
air heater 103 is introduced into aheat recovery unit 104 serving as a heat exchanger of gas-gas heater and then is heat-recovered by a heat exchange with a heat medium (for example, water). - A temperature of a flue gas G3 passed through the
heat recovery unit 104 becomes approximately 85° C. to 110° C. to improve dust-collecting capability of an electronic precipitator (EP) 105, for example. - The flue gas G3 passed through the
heat recovery unit 104 is introduced into theelectronic precipitator 105 and then the shoot dust therein is removed. - A flue gas G4 passed through the
electronic precipitator 105 is pressurized by anair blower 106 to be driven by an electric motor. In addition, theair blower 106 may not be provided, or may be disposed on a downstream side of areheating unit 108 of the gas-gas heater. - A flue gas G5 pressurized by the
air blower 106 is introduced intodesulfurization equipment 107. In thedesulfurization equipment 107, the sulfur oxide contained in the flue gas G5 is absorbed and removed by an absorbent which is prepared by dissolving limestone in a form of slurry, and gypsum (not illustrated) is produced as a by-product. Then, the temperature of a flue gas G6 passed through thedesulfurization equipment 107 is generally decreased to the extent of about 50° C. - The flue gas G6 passed through the
desulfurization equipment 107 is introduced into thereheating unit 108 serving as the heat exchanger of the gas-gas heater. In a process where aheat medium 83 is circulated while coming and going a pair of circulatingpipes 110 between theheat recovery unit 104 and thereheating unit 108 by a circulatingpump 109, the reheatingunit 108 heats the flue gas G6 by recovery heat which is recovered by theheat recovery unit 104. Here, the flue gas G6, which has the temperature of about 50° C., at an outlet of thedesulfurization equipment 107 is reheated to about 85° C. to 110° C. with thereheating unit 108, and then is released as a flue gas G8 from thechimney 111 to an atmosphere. -
FIG. 7 is a schematic view of a heat exchanger of an air pollution control installation. - As illustrated in
FIG. 7 , the heat exchanger into which the flue gas G2 is introduced to exchange heat with theheat medium 83 is provided. - The heat exchanger has the circulating
pipe 110 for circulating theheat medium 83 between theheat recovery unit 104 and thereheating unit 108. Theheat medium 83 is circulated between theheat recovery unit 104 and thereheating unit 108 through the circulatingpipe 110. A surface of the heatmedium circulating passage 110 provided in each of theheat recovery unit 104 and thereheating unit 108 is provided with aheat transfer tube 11 on which a plurality of fins are provided. Aheat exchanging unit 86 is provided in the heatmedium circulating passage 110 to compensate energy, which is equivalent to temperature drop absorbed by radiant heat when theheat medium 83 is circulated, by heating with asteam 87 and to be capable of maintaining and adjusting a medium temperature of theheat medium 83. - The
heat medium 83 is supplied to the heatmedium circulating passage 110 from aheat medium tank 88. Theheat medium 83 is circulated in the circulatingpassage 110 by the heatmedium circulating pump 109. In addition, a supply quantity of thesteam 87 is adjusted by an adjusting valve V1 according to the gas temperature of the purified gas G6 from thedesulfurization equipment 107, theheat medium 83 to be fed into thereheating unit 108 is supplied to theheat recovery unit 104 by an adjusting valve V2 according to the gas temperature of the flue gas G3 discharged from theheat recovery unit 104, and thus a supply quantity of theheat medium 83 to be fed into thereheating unit 108 is adjusted. Further, the purified gas G7 discharged from the reheatingunit 108 is discharged from thechimney 111 to the outside. - Hereinafter, the structure of the heat exchanger of the
heat recovery unit 104 and thereheating unit 108 according to the present embodiment will be described with reference to drawings.FIGS. 1-1 and 1-2 are a schematic view of the heat exchanger, respectively. - As illustrated in
FIGS. 1-1 and 1-2, the heat exchanger includes a heat transfer tube bundlehousing duct 20 in which a plurality of heat transfer tube bundles, that is, a high-temperature heattransfer tube bundle 22A, a middle-temperature heattransfer tube bundle 22B, and a low-temperature heattransfer tube bundle 22C are disposed from an upstream side in an inflowing direction of the flue gas, the heat transfer tube bundles being an aggregation which binds together the heat transfer tube bundles. - Further, the plurality of heat
transfer tube bundles 22A (22A1 to 22A3) , 22B (22B1 to 22B3) , and 22C (22C1 to 22C3) are disposed with a predetermined interval to perform the heat recovery or the heat exchange in a gas flowing direction of the flue gas. InFIG. 1 , the flue gas G, aduct inlet part 20 a, and an expandedpart 20 b are illustrated. In addition, an upstream side in a flue gas introducing direction of the heat transfer tube bundle is a front 22 a, and a downstream side in the flue gas introducing direction is a rear 22 b. - In drawings, an X-direction is the flue gas flowing direction, a Y-direction is an insertion direction of the heat transfer tube bundle, and a Z-direction is a stacked installation direction of the heat transfer tube bundle.
-
FIGS. 2-1 and 2-2 are perspective views illustrating schematically an exterior of the heat exchanger according to the first embodiment. - The heat exchanger includes the heat transfer tube bundle housing duct (hereinafter, referred to as a “bundle housing duct”) 20 which houses heat transfer tube bundles 22,
openings 26 which are provided on a sidewall of the heat transfer tube bundlehousing duct 20 to freely insert and remove the heat transfer tube bundles 22, andbottom rails 27 which are provided in a direction perpendicular to the inflowing direction of the flue gas G within thebundle housing duct 20 to freely move the heat transfer tube bundles. - Further, a
reference numeral 25 indicates a handrail provided in a framework stage through which persons come and go. Generally, thehandrail 25 is vertically stood so that persons do not fall down, but is configured such that the bundles can pass through, as illustrated inFIG. 2-1 , since thehandrail 25 is provided with a hinge which is movable so as to recline in a horizontal position at the time of taking the heat transfer tube bundles 22 in and out. - Further, a
floor 25 a of the handrail is configured so as to temporarily place the heat transfer tube bundles 22 when thehandrail 25 is reclined. - In drawings, the X-direction is the flue gas flowing direction, the Y-direction is the insertion direction of the heat transfer tube bundle, and the Z-direction is the stacked installation direction of the heat transfer tube bundle.
- In a case of specifying the number of leakage locations in a leak test during an operation, the heat
transfer tube bundle 20 is set to be drawn out in following manners. - 1) In a case of drawing out a specified heat transfer tube bundle (for example, heat
transfer tube bundle 22C3), firstly, theopening 26 is opened and thehandrail 25 is reclined. 2) Then, the heattransfer tube bundle 22C3, which is ranging from 20 to 30 tons per one bundle, is drawn out from theopening 25 while being supported with acrane 23. - 3) The heat transfer tube bundles are lifted and temporarily placed on a predetermined position using one crane (not illustrated) when the entire heat transfer tube bundles are come out of the
openings 26. - Thus, an operation of drawing out the heat transfer tube bundles from the stacked arrangement of each stage is facilitated.
- As a result, it is possible to independently draw out only bundle requiring repair and renewal from each stage of the stage-stacked bundle without drawing out another robust bundle.
- At this time, since the bundle-bottom-
rail 27 is installed at a position corresponding to a lower part of each bundle in a longitudinal direction inside the duct from a sidewall side to draw out and move the bundle toward the opening, the heat transfer tube bundle is easily drawn out in the longitudinal direction toward the opening of the sidewall on the bundle-bottom-rail 27. - The heat transfer tube bundle loaded on the bundle-bottom-
rail 27 is drawn out in the longitudinal direction by, for example, a chain block. - In the heat exchanger according to the present embodiment, since only specified heat transfer tube bundle can be drawn out, it is possible to shorten a maintenance period, resulting in minimizing the regular inspection period.
- In other words, in the related art, in order to draw out a lower bundle, a useless work for drawing out even the robust bundle of which the inspection is unnecessary needs to be performed, for example, module bundles ranging from, for example, 20 to 30 tons per one bundle are lifted one by one in turns from an upper-stage bundle by the crane from the opening installed at an upper part of the bundle housing duct for storing the bundle of the heat exchanger, while the present invention can shorten time of about 40% with respect to replacement work of the bundle ranging generally from 20 to 30 tons per one because of drawing out only the specified heat transfer tube bundle.
- In addition, since the bundle for requiring a repair is independently drawn out, a location on which the robust bundle is temporarily placed is unnecessary, and thus it is possible to cut a cost by such amount and to also reduce a damage risk during the temporary placement.
- Further, in case of requiring a checking work of the heat transfer tube bundle when a plant is stopped, since the inspection is performed by drawing out only target bundle at a place having a good working environment, temporary construction of an entire-face scaffold in the duct is unnecessary and thus it is possible to cut a cost by such amount and to shorten the period. Second Embodiment
-
FIG. 3 is a schematic view of a heat exchanger according to a second embodiment.FIGS. 4 and 5 are schematic views illustrating main parts ofFIG. 3 . The same reference numerals can be denoted to the same members as in the heat exchanger according to the first embodiment and the description thereof will not be presented. - As illustrated in
FIG. 3 , the heat exchanger according to the second embodiment includes atemporary support part 30 which is detachably provided in a structure (framework) 21 outside thebundle housing duct 20, a movingrail 31 which is supported by thetemporary support part 30 to move the heattransfer tube bundle 22, a drivingapparatus 32 which draws out the heattransfer tube bundle 22 onto the movingrail 31, and awire 33. - In the present embodiment, a
back rail 28 is provided at a portion which comes in contact with thebottom rail 27 of the heattransfer tube bundle 22. - On the surface of the
bottom rail 27 and theback rail 28,thin plates transfer tube bundle 22 is easily drawn out while sliding thethin plates - Accordingly, the drawing-out is facilitated by the moving
rail 31 provided outside thebundle housing duct 20 and the drivingapparatus 32 such as a winch auxiliary mechanism capable of pulling transversely the heattransfer tube bundle 22. - In order not to derail during the drawing-out, further, a
guide member 31 a is provided on the movingrail 31. - In addition, an
enclosure part 36 is provided at a lateral face of thebottom rail 27, which is provided in thestructure 21 inside thebundle housing duct 20, to prevent the mixing of ashes. - At least two cranes are required for the first embodiment, but the configuration of the present embodiment requires one crane. Accordingly, it is possible to reduce a maintenance space by such amount.
- In addition, by selecting combinations of the materials having the low friction coefficient for the
thin plates - Here, examples of the combinations of the materials having the low friction coefficient may include Cr (chrome plating)—Cu (copper alloy) and SUS (bundle frame material)—Cu (copper alloy).
- Further, examples of preferable materials with respect to sliding wear seizure may include a combination of steel (SUS)—hard chrome plating, but are not limited thereto.
- In addition, examples of a combination of materials having corrosion resistance may include a combination of annealed steel—SUS material, but are not limited thereto.
- Further, since there is a possibility that soot dusts of coal ash or fixing components are attached to the bundle-bottom-
rail 27, it may install a protective cover for the bundle-bottom-rail to expose and move the bundle-bottom-rail 27 by removing the cover after stopping the plant. - This can prevent inhibition of bundle maintenance work due to ashes or fixing substances on the rail below the bundle.
- In addition, the
handrail 25 provided in the framework stage through which persons come and go is vertically stood so that persons do not fall down, but is configured such that the bundles can pass through, as illustrated inFIG. 2-1 , since thehandrail 25 is provided with the hinge which is movable so as to recline in the horizontal position at the time of taking the heattransfer tube bundle 22 in and out. - As described above, according to the present invention, since a construction period is significantly shortened in repair and renewal constructions of a large-sized heat exchange bundle after a rapid detection of the leakage locations of the heat medium or during the regular inspection period of power plant, it is possible to achieve an improvement of operation rate and thus to achieve an increase of annual energy production of power.
- Further, since a massive scaffold set is unnecessary, it is possible to achieve a curtailment of the regular inspection period of the bundle, a significant improvement of maintenance workability, and a reduction of safety risk.
- 20 Heat Transfer Tube Bundle Housing Duct
- 21 Structure
- 22 Heat Transfer Tube Bundle
- 23 Crane
- 25 Handrail
- 26 Opening
- 27 Bottom Rail
- 28 Back Rail
- 31 Moving Rail
- 31 a Guide Member
- 32 Driving Apparatus
- 33 Wire
- 35A, 35B Thin Plate
- 36 Enclosure Part
Claims (5)
1-5. (canceled)
6. A heat exchanger, comprising:
a heat transfer tube bundle housing duct for housing heat transfer tube bundles;
openings provided on a sidewall of the heat transfer tube bundle housing duct, for freely inserting and removing the heat transfer tube bundles;
rails provided in a direction perpendicular to an inflowing direction of a flue gas within the heat transfer tube bundle housing duct, for freely moving the heat transfer tube bundles;
temporary support parts provided in a structure outside the heat transfer tube bundle housing duct;
moving rails supported by the temporary support parts, for moving the heat transfer tube bundles; and
a driving apparatus for drawing out the heat transfer tube bundles on the moving rails.
7. The heat exchanger according to claim 6 , comprising:
bundle-bottom-rails provided in the openings, for drawing out and moving the heat transfer tube bundles from a sidewall side in a direction perpendicular to a flue gas direction within the heat transfer tube bundle housing duct.
8. The heat exchanger according to claim 6 , comprising:
bundle-bottom-rail provided in the openings, for drawing out and moving the heat transfer tube bundles from the sidewall side in a direction perpendicular to a flue gas direction within the heat transfer tube bundle housing duct.
9. The heat exchanger according to claim 8 , comprising:
back rails provided at back sides of the heat transfer tube bundles, the back side coming in contact with the bundle-bottom-rail.
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2011043313A JP5721472B2 (en) | 2011-02-28 | 2011-02-28 | Heat exchanger |
JP2011-043313 | 2011-02-28 | ||
PCT/JP2011/075982 WO2012117621A1 (en) | 2011-02-28 | 2011-11-10 | Heat exchanger |
Publications (1)
Publication Number | Publication Date |
---|---|
US20130327510A1 true US20130327510A1 (en) | 2013-12-12 |
Family
ID=46757570
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US14/001,558 Abandoned US20130327510A1 (en) | 2011-02-28 | 2011-11-10 | Heat exchanger |
Country Status (7)
Country | Link |
---|---|
US (1) | US20130327510A1 (en) |
EP (1) | EP2682677B1 (en) |
JP (1) | JP5721472B2 (en) |
ES (1) | ES2727803T3 (en) |
PL (1) | PL2682677T3 (en) |
TR (1) | TR201911008T4 (en) |
WO (1) | WO2012117621A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170023240A1 (en) * | 2013-12-23 | 2017-01-26 | Thermodesign Inc. | High temperature fluid generator |
US20200200426A1 (en) * | 2018-12-20 | 2020-06-25 | Johnson Controls Technology Company | Energy recovery wheel assembly for an hvac system |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6244606B2 (en) * | 2013-08-07 | 2017-12-13 | 三菱日立パワーシステムズ環境ソリューション株式会社 | Heat exchanger repair method |
EP3170541B1 (en) | 2015-11-18 | 2018-09-26 | Bosal Emission Control Systems NV | Combined evaporator and mixer |
JP6622160B2 (en) * | 2016-09-01 | 2019-12-18 | 東邦瓦斯株式会社 | Waste heat recovery boiler |
WO2019208496A1 (en) * | 2018-04-23 | 2019-10-31 | 三菱日立パワーシステムズ株式会社 | Heat exchanger |
RU2771558C1 (en) * | 2021-09-29 | 2022-05-05 | Ришат Сафуанович Шаймухаметов | Boiler |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4255841A (en) * | 1979-08-20 | 1981-03-17 | Ecolaire Incorporated | Condenser construction with delayed tube bundles |
US5032054A (en) * | 1987-11-04 | 1991-07-16 | Serv-Tech, Inc. | Aerial bundle puller |
US5203072A (en) * | 1991-01-17 | 1993-04-20 | Ohmstede Mechanical Services, Inc. | Detachable crane- or boom-operated heat exchanger tube bundle extractor |
US5339891A (en) * | 1993-07-15 | 1994-08-23 | The Babcock & Wilcox Company | Modular arrangement for heat exchanger units |
US5722354A (en) * | 1995-12-08 | 1998-03-03 | Db Riley, Inc. | Heat recovery steam generating apparatus |
US6729833B2 (en) * | 2000-09-25 | 2004-05-04 | Starcon International, Inc. | Method and apparatus for extracting and installing heat exchanger bundles |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS58221381A (en) * | 1982-06-17 | 1983-12-23 | Ebara Corp | Waste heat retrieving type heat exchanger |
JPS6446601U (en) * | 1987-09-10 | 1989-03-22 | ||
JP2678075B2 (en) * | 1990-02-01 | 1997-11-17 | 日揮株式会社 | Tube bundle drawing and pushing device for horizontal multi-tube heat exchanger |
EP0555719B1 (en) * | 1992-02-14 | 1995-08-16 | Siemens Aktiengesellschaft | Process and installation for reducing the content of nitrogen oxides in flue gas |
JPH10311526A (en) * | 1997-05-13 | 1998-11-24 | Mitsui Eng & Shipbuild Co Ltd | Horizontal high temperature air heater and waste treating apparatus |
JPH11118371A (en) * | 1997-10-20 | 1999-04-30 | Ishikawajima Harima Heavy Ind Co Ltd | Heat exchanger |
JP2000009395A (en) * | 1998-06-19 | 2000-01-14 | Mitsubishi Heavy Ind Ltd | Heat exchanger incorporating soot blower |
JP2000039287A (en) * | 1998-07-23 | 2000-02-08 | Ishikawajima Harima Heavy Ind Co Ltd | Heat exchanger |
JP3970619B2 (en) * | 2002-01-31 | 2007-09-05 | バブコック日立株式会社 | Exhaust heat recovery boiler construction method |
JP4234517B2 (en) * | 2003-07-25 | 2009-03-04 | 株式会社東芝 | Waste heat recovery boiler and its installation method |
JP4838680B2 (en) * | 2006-03-27 | 2011-12-14 | 三菱レイヨン株式会社 | Heat exchanger |
JP5010635B2 (en) * | 2009-03-18 | 2012-08-29 | 三菱重工業株式会社 | Heat exchanger |
-
2011
- 2011-02-28 JP JP2011043313A patent/JP5721472B2/en active Active
- 2011-11-10 ES ES11859815T patent/ES2727803T3/en active Active
- 2011-11-10 WO PCT/JP2011/075982 patent/WO2012117621A1/en active Application Filing
- 2011-11-10 EP EP11859815.0A patent/EP2682677B1/en active Active
- 2011-11-10 US US14/001,558 patent/US20130327510A1/en not_active Abandoned
- 2011-11-10 TR TR2019/11008T patent/TR201911008T4/en unknown
- 2011-11-10 PL PL11859815T patent/PL2682677T3/en unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4255841A (en) * | 1979-08-20 | 1981-03-17 | Ecolaire Incorporated | Condenser construction with delayed tube bundles |
US5032054A (en) * | 1987-11-04 | 1991-07-16 | Serv-Tech, Inc. | Aerial bundle puller |
US5203072A (en) * | 1991-01-17 | 1993-04-20 | Ohmstede Mechanical Services, Inc. | Detachable crane- or boom-operated heat exchanger tube bundle extractor |
US5339891A (en) * | 1993-07-15 | 1994-08-23 | The Babcock & Wilcox Company | Modular arrangement for heat exchanger units |
US5722354A (en) * | 1995-12-08 | 1998-03-03 | Db Riley, Inc. | Heat recovery steam generating apparatus |
US6729833B2 (en) * | 2000-09-25 | 2004-05-04 | Starcon International, Inc. | Method and apparatus for extracting and installing heat exchanger bundles |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20170023240A1 (en) * | 2013-12-23 | 2017-01-26 | Thermodesign Inc. | High temperature fluid generator |
US10704783B2 (en) * | 2013-12-23 | 2020-07-07 | Thermodesign, Inc | High temperature fluid generator |
US20200200426A1 (en) * | 2018-12-20 | 2020-06-25 | Johnson Controls Technology Company | Energy recovery wheel assembly for an hvac system |
US10989434B2 (en) * | 2018-12-20 | 2021-04-27 | Johnson Controls Technology Company | Removable energy recovery wheel assembly for an HVAC system |
US12007138B2 (en) | 2018-12-20 | 2024-06-11 | Tyco Fire & Security Gmbh | Removable energy recovery wheel assembly for an HVAC system |
Also Published As
Publication number | Publication date |
---|---|
WO2012117621A1 (en) | 2012-09-07 |
EP2682677B1 (en) | 2019-05-08 |
JP5721472B2 (en) | 2015-05-20 |
JP2012180958A (en) | 2012-09-20 |
EP2682677A1 (en) | 2014-01-08 |
PL2682677T3 (en) | 2019-10-31 |
TR201911008T4 (en) | 2019-08-21 |
ES2727803T3 (en) | 2019-10-18 |
EP2682677A4 (en) | 2018-01-17 |
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Legal Events
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AS | Assignment |
Owner name: MITSUBISHI HEAVY INDUSTRIES, LTD., JAPAN Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:KAMIYAMA, NAOYUKI;MIYACHI, TSUYOSHI;OKAMOTO, TAKUYA;AND OTHERS;REEL/FRAME:031081/0674 Effective date: 20130809 |
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STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |