US3915105A - Wet bin for collection and quenching of ashes from a pulverized coal combustion chamber - Google Patents

Wet bin for collection and quenching of ashes from a pulverized coal combustion chamber Download PDF

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Publication number
US3915105A
US3915105A US467713A US46771374A US3915105A US 3915105 A US3915105 A US 3915105A US 467713 A US467713 A US 467713A US 46771374 A US46771374 A US 46771374A US 3915105 A US3915105 A US 3915105A
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US
United States
Prior art keywords
collecting box
ash hopper
supporting table
ashes
wet bin
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.)
Expired - Lifetime
Application number
US467713A
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English (en)
Inventor
Bernhard Michelbrink
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Deutsche Babcock and Wilcox AG
Original Assignee
Deutsche Babcock and Wilcox AG
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
Priority claimed from DE19732325923 external-priority patent/DE2325923C2/de
Application filed by Deutsche Babcock and Wilcox AG filed Critical Deutsche Babcock and Wilcox AG
Application granted granted Critical
Publication of US3915105A publication Critical patent/US3915105A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J1/00—Removing ash, clinker, or slag from combustion chambers
    • F23J1/02—Apparatus for removing ash, clinker, or slag from ash-pits, e.g. by employing trucks or conveyors, by employing suction devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
    • F23J2700/002—Ash and slag handling in pulverulent fuel furnaces

Definitions

  • a wet bin for collecting and! quenching hot ashes discharged from an ash hopper of a pulverized coal combustion chamber includes an inclined table and scraper means which enables discharged hot ashes to be gradually quenched with increasing immersion in the water in the bin. This gradual quenching of larger lumps of hot ashes minimizes the possibility of explosive-like detonations that can accompany sudden and quick quenching.
  • the wet bin may be sealed from the ash hopper by providing pivotally mounted flaps which extend beneath the water level in the collecting box of the wet bin to provide a barrier through which the scraper can pass without disturbing the seal since at least a pair of such flaps are provided at the sealed edge of the ash hopper discharge outlet.
  • German Pat. application No. P 02 670.813 there is disclosed a wet bin having a water-filled collecting box in which is located a supporting table positioned beneath the ash hopper outlet.
  • This table has a grate-like structure provided with slots running in the direction of the movement of an endless scraper which moves over the upper surface of the table and removes hot ashes discharged there by scraping into the collecting box.
  • Such a wet bin has reduced the possibility of explosion-like detonations from sudden quenching of large lumps of still hot ashes by providing a structure which shatters the ashes into small pieces. These small pieces either drop through the slots in the table grate or cool off slowly in water which extends over the top of the supporting table from which they are removed by the scraper into deeper water in the collecting box.
  • the wet bin When the water level is only slightly above the supporting table and below the bottom of the ash hopper, the wet bin is desirably sealed off from the ash hopper. This is essential to prevent the entry of unfiltered air into the ash hopper, which is generally under a reduced pressure, which could undesirably have internal effects on the firing in the combustion chamber.
  • a wet bin which is sealed off from the ash hopper by means of a sealing body which floats on the surface of the quenching water within the collecting box.
  • the present invention is a further improvement on the above described wet bin and provides a wet bin which more effectively minimizes the possibility and hazard of explosion-like detonations due to sudden quenching of large hot ash lumps.
  • the present invention also provides an effective means of sealing the wet bin from the ash hopper in order to assure that no air enters the ash hopper.
  • the foregoing is accomplished according to this invention by providing a supporting table which is inclined downward to the horizontal surface of the water within the collecting box in the direction of the movement of the scraper, so that hot ashes discharged onto the table surface are gradually submerged in the quenching water as they are removed therefrom.
  • the supporting table slants downward in the direction of the movement of the scraper moving along the upper surface of the supporting table which is desirably positioned horizontally in the area below the outlet of the ash hopper.
  • the table extends generally longitudinally and horizontally in the direction of the movement of the scraper while being inclined in a portion only, in the region of its end from which the ashes are scraped into the deeper quenching water.
  • the wet bin according to this invention also effectively seals off the ash hopper from the wet bin collection box to assure that no air can enter it,
  • This sealing is accomplished according to this invention by a pair of flaps lying one behind the other in the direction of the movement of the scraper along the upper surface of the supporting table. These flaps may be situated on both sides of the ash hopper discharge outlet if necessary.
  • the sealing flaps are pivotally separately hung on the frame of the ash hopper on the corner of the wet bin so that the lower edge of each extends below the surface of the quenching water within the collecting box. When the scraper passes through this barrier, the scraping element will lift one of the flaps at a time so that the other flap remains dipped into the water to effect the sealing off by itself.
  • a wet bin utilized to collect and quench hot ashes from pulverized coal combustion chambers of the type used in steam generating boiler installations.
  • the ashes appear dry and may be in powder, dust-like, granulated or sintered form.
  • the ashes are discharged through the drop shaft of an ash hopper, indicated generally at l, and enter a collecting box 2 through the discharge outlet of the ash hopper.
  • the collecting box 2 is essentially a trough open at the top which inclines upward at one side.
  • the collecting box 2 is filled with quenching water, up to the level indicated generally at 5, which is used to cool the hot ashes.
  • the scraper chain 6 is of the endless stringer type and is led around the rollers 8 to pass over the upper surface of a grate-like supporting table 11 and thence along the bottom of the collecting box 2.
  • the ashes falling to the bottom of the collecting box 2 are transported by the scrapers 7 of the lower stringer of the scraper chain 6 to the slag outlet and there dumped.
  • the lower end of the ash hopper 1 is moveably sealed off from the collecting box 2 by means of an apron 3 which fits into a water container 4 on the housing of the collecting box 2.
  • the ash hopper l is moveably sealed off from the collecting box 2 through an effective water seal.
  • a supporting table 11 is provided below the outlet area of the ash hopper l at a slight distance below the surface of the quenching water.
  • This table may be constructed as a plane surface grate having slots between the bars of the grate which run in the direction of the movement of the scraper chain 6.
  • the supporting table 11 is horizontal, and extends longitudinally in the direction of the movement of the upper stringer of the scraper chain 6, in the region below the ash hopper outlet.
  • a portion of the supporting table 11 beyond or downstream of the area of the ash hopper outlet (the direction shown by the arrow 9 being taken as progressing from upstream to downstream) is inclined downwardly to the horizontal surface of the water, indicated at 5, within the collection box 2. This inclination is shown generally at 11a.
  • the wet bin acts to quench the hot ashes as follows. Fine ash particles discharged from the ash hopper 1 arrive directly at the bottom of the collecting box 2 by passing through the slots of the supporting table 11. Larger lumps of ash break up on the bars of the supporting table 11 and according to their size, either go through the table slots or are carried along the upper surface of the supporting table by the scrapers 7 of the scraper chain 6 which passes thereover. As the larger lumps of ash pass over the upper surface of the supporting table 1 1, those still hot are cooled off slowly before they are discharged into the deeper water within the collection box 2. This slow cooling is promoted by the fact that a portion of the supporting table is inclined, shown at 1 la, downward from the horizontal line of the water level.
  • two flaps 12 are provided one behind the other, in front or upstream of the ash hopper l, in the direction of movement of the scraper chain 6 as shown by the arrow 9. These flaps 12 are mounted along the upper trough cover or on the ash hopper in such a way that they can pivot. As shown here, the trough cover is connected with the housing of the ash hopper l. The lower edges of the flaps l2 dip into the quenching water beneath the surface, shown at 5, to effect a seal.
  • the flaps are mounted at right angles to the direction of movement of the scraper chain 6 and extend across the width of the collection box 2 to provide the appropriate seal.
  • Each flap 12 may consist of several sections.
  • the scraper chain 6 passes through the flaps 12, the scraper 7 will lift one of the flaps 12, mounted one after the other, while not lifting the other.
  • the flaps are mounted sufficiently apart so that only one at a time can be lifted while one maintains a seal by extending beneath the water surface at all times.
  • the distance between the two flaps has a definite lowest value, which depends on the angle of deflection of the foremost flap and the distance between the scraper of the scraper chain, which should not be exceeded.
  • a second pair of flaps 12 may also be located behind the ash hopper l in the event that the collecting box 2 is not closed at the top at this point.
  • an improved wet bin for collecting and quenching hot ashes which minimizes the hazards of explosion and detonation associated with rapid quenching of large lumps of hot ashes and which provides an effective and improved sealing means for maintaining the ash hopper sealed off from the wet bin collecting box.
  • a wet bin for collecting and quenching hot ashes discharged from an ash hopper of a pulverized coal combustion chamber comprising a collecting box situated beneath the ash hopper, the collecting box being capable of holding water, a supporting table means located within the collecting box and beneath the ash hopper outlet to receive the hot ashes discharged therefrom, an endless scraper means arranged to move over the supporting table means and remove ashes from the upper surface thereof into the collecting box, the supporting table means upper surface being inclined downward to the horizontal surface of water within the collection box, in the direction of movement of the scraper means along the upper surface, so that ashes removed from the supporting table upper surface are gradually increasingly quenched by water within the collecting box.
  • a wet bin as claimed in claim 1 wherein the collecting box is sealed from the ash hopper, with the exception of the ash hopper discharge outlet communicating with the area above the supporting table means which receives the hot ashes, further comprising at least a pair of sealing flaps pivotally supported on both sides of the ash hopper discharge outlet, the sealing flaps being mounted one behind the other in the direction of movement of the scraper means along the upper surface and extending beneath the surface of the water in the collecting box, the sealing flaps extending across the width of the collecting box so that a vapor seal between the collecting box and the ash hopper is obtained.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gasification And Melting Of Waste (AREA)
US467713A 1973-05-22 1974-05-07 Wet bin for collection and quenching of ashes from a pulverized coal combustion chamber Expired - Lifetime US3915105A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19732325923 DE2325923C2 (de) 1970-01-22 1973-05-22 Naßentascher für Kohlenstaubbrennkammern

Publications (1)

Publication Number Publication Date
US3915105A true US3915105A (en) 1975-10-28

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Family Applications (1)

Application Number Title Priority Date Filing Date
US467713A Expired - Lifetime US3915105A (en) 1973-05-22 1974-05-07 Wet bin for collection and quenching of ashes from a pulverized coal combustion chamber

Country Status (4)

Country Link
US (1) US3915105A (cs)
CS (1) CS168475B2 (cs)
PL (1) PL93311B1 (cs)
YU (1) YU35395B (cs)

Cited By (24)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227468A (en) * 1978-07-11 1980-10-14 Deutsche Babcock Aktiengesellschaft Immersion piece for the ash funnel of a combustion chamber
US4269125A (en) * 1979-07-27 1981-05-26 Combustion Engineering, Inc. Pulverizer rejects disposal
EP0031098A1 (en) * 1979-12-13 1981-07-01 Combustion Engineering, Inc. An ash-disposal system with submerged scraper
US4300457A (en) * 1980-04-14 1981-11-17 Combustion Engineering, Inc. Adjustable submerged scraper conveyor seal trough
US4329929A (en) * 1980-01-11 1982-05-18 Deutsche Babcock Aktiengesellschaft Wet deasher
WO1982002425A1 (en) * 1981-01-02 1982-07-22 Moore Richard Francis Removable seal plates
EP0077472A1 (en) * 1981-10-15 1983-04-27 Combustion Engineering, Inc. Structural water seal trough
US4387651A (en) * 1981-01-02 1983-06-14 Combustion Engineering, Inc. Removable seal plates
US4440097A (en) * 1981-08-19 1984-04-03 Lothar Teske Ash-removal conveyor for a coal-fired boiler
US4512265A (en) * 1978-07-11 1985-04-23 Deutsche Babcock Aktiengesellschaft Wet ash remover
US4534299A (en) * 1984-03-07 1985-08-13 Deutsche Babcock Werke Aktiengesellschaft Wet ash removal equipment
US4545305A (en) * 1984-10-05 1985-10-08 Combustion Engineering, Inc. Combined primary and spare submerged scraper conveyor arrangement
US4599951A (en) * 1984-09-12 1986-07-15 Von Roll Ag. Apparatus for discharging incineration residues from furnaces, particularly refuse incinerators
US4718357A (en) * 1987-01-08 1988-01-12 Wang Chi Chen Multi-function automatic garbage furnace
US4744314A (en) * 1986-07-02 1988-05-17 Hoskinson Gordon H Ash removal apparatus for an incinerator
US5082572A (en) * 1990-09-05 1992-01-21 Ogden Martin Systems, Inc. Ash vibration process and apparatus
US6082442A (en) * 1997-05-21 2000-07-04 Babock Kraftwerkstechnik Gmbh Apparatus for removal and cooling of ash from the bed of a fluidized bed furnace
US6230633B1 (en) * 1995-06-19 2001-05-15 Mario Magaldi Conveyor/cooler of loose materials
US20050061216A1 (en) * 2003-09-22 2005-03-24 Behunin Max D. Method of clean burning and system for same
US20110226194A1 (en) * 2010-03-22 2011-09-22 Mooney Gary D Bottom Ash Dewatering System Using a Remote Submerged Scraper Conveyor
WO2011156871A1 (en) * 2010-06-18 2011-12-22 Btola Pty Ltd Indirectly fired gas turbine assembly
CN103615731A (zh) * 2013-10-29 2014-03-05 青岛德施普机械工业有限公司 一种煤粉炉除渣系统
JP2015140955A (ja) * 2014-01-28 2015-08-03 Ｊｆｅエンジニアリング株式会社 水砕スラグ搬送装置
CN110345492A (zh) * 2019-08-22 2019-10-18 普霖环境科技有限公司 一种用于固体废物处理设备的排渣系统

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589836A (en) * 1948-10-01 1952-03-18 Martin Josef Ash removal device
US2983234A (en) * 1958-11-19 1961-05-09 Dravo Corp Incinerator and ash removal and gas scrubbing apparatus therefor
US3504645A (en) * 1968-08-15 1970-04-07 Beaumont Birch Co Enclosed conveyor return run for incinerators
US3771470A (en) * 1972-07-31 1973-11-13 R Hampton Incinerator stoker siftings conveyor mechanism

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2589836A (en) * 1948-10-01 1952-03-18 Martin Josef Ash removal device
US2983234A (en) * 1958-11-19 1961-05-09 Dravo Corp Incinerator and ash removal and gas scrubbing apparatus therefor
US3504645A (en) * 1968-08-15 1970-04-07 Beaumont Birch Co Enclosed conveyor return run for incinerators
US3771470A (en) * 1972-07-31 1973-11-13 R Hampton Incinerator stoker siftings conveyor mechanism

Cited By (26)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4227468A (en) * 1978-07-11 1980-10-14 Deutsche Babcock Aktiengesellschaft Immersion piece for the ash funnel of a combustion chamber
US4512265A (en) * 1978-07-11 1985-04-23 Deutsche Babcock Aktiengesellschaft Wet ash remover
US4269125A (en) * 1979-07-27 1981-05-26 Combustion Engineering, Inc. Pulverizer rejects disposal
EP0031098A1 (en) * 1979-12-13 1981-07-01 Combustion Engineering, Inc. An ash-disposal system with submerged scraper
US4329929A (en) * 1980-01-11 1982-05-18 Deutsche Babcock Aktiengesellschaft Wet deasher
US4300457A (en) * 1980-04-14 1981-11-17 Combustion Engineering, Inc. Adjustable submerged scraper conveyor seal trough
WO1982002425A1 (en) * 1981-01-02 1982-07-22 Moore Richard Francis Removable seal plates
US4387651A (en) * 1981-01-02 1983-06-14 Combustion Engineering, Inc. Removable seal plates
US4440097A (en) * 1981-08-19 1984-04-03 Lothar Teske Ash-removal conveyor for a coal-fired boiler
EP0077472A1 (en) * 1981-10-15 1983-04-27 Combustion Engineering, Inc. Structural water seal trough
US4534299A (en) * 1984-03-07 1985-08-13 Deutsche Babcock Werke Aktiengesellschaft Wet ash removal equipment
US4599951A (en) * 1984-09-12 1986-07-15 Von Roll Ag. Apparatus for discharging incineration residues from furnaces, particularly refuse incinerators
US4545305A (en) * 1984-10-05 1985-10-08 Combustion Engineering, Inc. Combined primary and spare submerged scraper conveyor arrangement
US4744314A (en) * 1986-07-02 1988-05-17 Hoskinson Gordon H Ash removal apparatus for an incinerator
US4718357A (en) * 1987-01-08 1988-01-12 Wang Chi Chen Multi-function automatic garbage furnace
US5082572A (en) * 1990-09-05 1992-01-21 Ogden Martin Systems, Inc. Ash vibration process and apparatus
US6230633B1 (en) * 1995-06-19 2001-05-15 Mario Magaldi Conveyor/cooler of loose materials
US6082442A (en) * 1997-05-21 2000-07-04 Babock Kraftwerkstechnik Gmbh Apparatus for removal and cooling of ash from the bed of a fluidized bed furnace
US20050061216A1 (en) * 2003-09-22 2005-03-24 Behunin Max D. Method of clean burning and system for same
US7140309B2 (en) * 2003-09-22 2006-11-28 New Energy Corporation Method of clean burning and system for same
US20110226194A1 (en) * 2010-03-22 2011-09-22 Mooney Gary D Bottom Ash Dewatering System Using a Remote Submerged Scraper Conveyor
US9593850B2 (en) 2010-03-22 2017-03-14 Clyde Bergemann, Inc. Bottom ash dewatering system using a remote submerged scraper conveyor
WO2011156871A1 (en) * 2010-06-18 2011-12-22 Btola Pty Ltd Indirectly fired gas turbine assembly
CN103615731A (zh) * 2013-10-29 2014-03-05 青岛德施普机械工业有限公司 一种煤粉炉除渣系统
JP2015140955A (ja) * 2014-01-28 2015-08-03 Ｊｆｅエンジニアリング株式会社 水砕スラグ搬送装置
CN110345492A (zh) * 2019-08-22 2019-10-18 普霖环境科技有限公司 一种用于固体废物处理设备的排渣系统

Also Published As

Publication number Publication date
YU107474A (en) 1980-06-30
PL93311B1 (pl) 1977-05-30
YU35395B (en) 1980-12-31
CS168475B2 (cs) 1976-06-29

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