US20090173258A1 - System For Milling And Air-Water Cooling Bottom Ash From Heating Furnaces For Solid Fuels - Google Patents

System For Milling And Air-Water Cooling Bottom Ash From Heating Furnaces For Solid Fuels Download PDF

Info

Publication number
US20090173258A1
US20090173258A1 US12/225,050 US22505007A US2009173258A1 US 20090173258 A1 US20090173258 A1 US 20090173258A1 US 22505007 A US22505007 A US 22505007A US 2009173258 A1 US2009173258 A1 US 2009173258A1
Authority
US
United States
Prior art keywords
crusher
ash
milling
air
water
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
Application number
US12/225,050
Other languages
English (en)
Inventor
Mario Magaldi
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.)
Magaldi Ricerche e Brevetti SRL
Original Assignee
Magaldi Ricerche e Brevetti SRL
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 Magaldi Ricerche e Brevetti SRL filed Critical Magaldi Ricerche e Brevetti SRL
Assigned to MAGALDI RICERCHE E BREVETTI S.R.L. reassignment MAGALDI RICERCHE E BREVETTI S.R.L. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MAGALDI, MARIO
Publication of US20090173258A1 publication Critical patent/US20090173258A1/en
Abandoned legal-status Critical Current

Links

Images

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
    • F23J2700/001—Ash removal, handling and treatment means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/01003—Ash crushing means associated with ash removal means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES 
    • F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
    • F23J2900/01005—Mixing water to ash

Definitions

  • cooling ash on the offload conveyor and the subsequent conveyors is achieved by forced-convection heat exchange with air returning to the system once it has been pulled out by depression value occurring at the bottom of the furnace. Cooling air is introduced throughout suitable ports located at the sidewalls of the extractor and the subsequent conveyors and it runs over the ash while passing through the line of counter-flow conveyor machines until it reaches the combustion chamber.
  • the system provides one or more milling stages between the extractor and the subsequent conveyor/cooler, as well as between two subsequent conveyors, in order to increase efficiency in air-ash heat exchanging. Such milling systems by reducing particle size of the ash increase available surface thereof for heat exchange with the counter-flow air.
  • either the main extractor receiving ash from furnace either the subsequent conveyors are provided with fine ash recuperators located at the bottom. The recuperated ash is then unloaded together with heavy ash lumps on the next machine.
  • the known system provides a by-pass duct with a suitable diameter connecting extractor top cover, in vicinity of unloading point, to the subsequent conveyor cover, in a position just downstream in respect of the unloading point.
  • the aim is to allow a preferential path for the cooling air, while passing from a conveyor to the previous one, by starting it from the top of the ash conveyor belt.
  • this solution reduces the ash cooling efficiency a lot, because only a minimum amount of air crosses the crusher where the heat-exchange efficiency is maximum due to opening of the ash flow falling in the crusher and to reduction of lump size achieved by crushing members that cause the available forced-convection heat-exchange surface of the ash to increase.
  • the separation of the fine ash unloading is achieved forming a dedicated opening at the rear wall of the crusher, to which an unloading channel of the ash recuperating machine is connected and by isolating said unloading from crusher environment by means of a valve located in the unloading channel and a closing shield downstream of the traction head of the fine ash recuperator.
  • the position of the fine ash entry to the crusher is such as to avoid pass through the milling zone for the fine ash and showing itself as a compact flow and any more dispersed in free fall, it results hardly entrainable by the cooling air crossing in counter-flow the crusher.
  • the pre-crusher function is to execute a first milling of large ash lumps at high temperature that obstruct the crusher port, making the rotor teeth milling action faster and more efficient.
  • the pre-crusher intervention is activated by a laser or equivalent sensor which senses the presence of incoming large ash lumps within milling area.
  • Water for the cooling system is supplied preferably through the rotor axis and/or at the base of fixed slab and passes therefrom in the milling area through nozzles placed in the toothed rotor and/or in the fixed slab.
  • Said cooling system is actuated by increase of the temperature values of the toothed roller and the crusher casing, detected by means of suitable sensors, and determined by presence of ash, or large agglomerates, at high temperature.
  • the water flow rate to be supplied to the nozzles can be adjusted depending on temperature of the ash leaving the crusher and detected on the downstream machine by a suitable sensor. Steam occurring during cooling process, thanks to the separation of the crusher environment from the fine ash recuperator, will be dragged by the cooling air directly to the combustion chamber.
  • This system configuration allows numerous and notable advantages since it removes obstructions and early wear for the fine ash recuperator, reducing wear of the crusher which has any more to process fine material too, the efficiency of the heat exchange between air and ash is taken to the maximum since all the cooling air collides with the ash during falls between one conveyor machine and the next one and the cooling and milling process is optimised also for large ash lumps at high temperature further achieving an effective cooling of the crusher.
  • FIG. 1 shows a cross-sectional view of the integrated milling and air/water cooling system.
  • FIG. 2 shows a schematisation of positioning of the integrated milling and cooling system inside of the extraction and cooling air flow system throughout the system.
  • FIG. 3 shows a milling and air/water cooling system axonometric projection.
  • the milling and cooling system hereinafter described permits numerous and notable advantages because: it improves cooling air fluid dynamics with consequent removal of malfunctions and excessive wear for fine ash recuperating machines and crusher wear reduction, the efficiency of the heat exchange between air and ash is taken to the maximum since all the cooling air collides with the ash during falls between one conveyor machine and the next one and the cooling and milling process is optimised also for large ash lumps at high temperature further achieving a effective cooling of the crusher milling members.
  • the system is constituted by a crusher 1 provided with a single, or dual, toothed roller 9 , a pre-milling device 2 , air 3 and water 4 cooling system and characterized by a side inlet 13 for fine material separate from lump sized ash inlet.
  • the separate fine ash unloading 5 , 6 , 13 from the crusher 1 is formed by a suitable channel 14 , independent from main ash unloading 16 , connected to a suitable opening 13 formed in the rear wall of the crusher 1 .
  • the fine ash inlet position to the crusher 1 is such as to avoid it crossing the milling members 9 .
  • a counter-weight or automatic valve 5 allows discharge of fine material preventing air intake within the recuperator when it crosses the crusher counter-flow.
  • a closing shield 6 placed downstream of the traction head 15 of the fine ash recuperator allows to isolate this zone from the conveyor machine unloading zone 16 and to remove air recurrences within the fine ash recuperator 15 .
  • the water cooling system 3 - 4 allows an additional cooling for large ash agglomerates at high temperature and it is operated depending on the rotor's 9 and casing's 11 temperature, detected by suitable sensors 12 , which increases due to the presence of large lumps and/or ash high flow rate at high temperature in the milling area.
  • the water cooling system 3 - 4 provides sprinkling nozzles 3 arranged preferably within the rotor 9 and/or the fixed slab 10 .
  • the water supplied through the shaft 8 of the rotor 9 and/or above the fixed slab 10 reaches the milling area through suitable ducts 4 and nozzles 3 cooling the ash entering the crusher 1 and simultaneously helping in cooling effectively the working members 9 - 10 .
  • the water flow rate adjustment for the nozzles 3 is obtained depending on the temperature of the ash exiting the crusher 1 detected by a suitable sensor 19 on the machine downstream the crusher.
  • the pre-crusher 2 is constituted by plates with punches 20 made by suitable anti-wear material, that slide opposing on a fixed frame 21 connected to the crusher's 1 port, and actuated by hydraulic cylinders 22 .
  • Such a device facilitates and speeds up actions of the rotor's 9 teeth of the crusher 1 when ash large lumps at high temperature obstruct inlet thereof, by moving and partially milling them by movement of the plates with punches 20 .
  • the pre-crusher's 2 intervention is controlled by a laser or equivalent sensor 7 which detects presence of ash large lumps in the milling area.
  • the air and water cooling and milling system according to the present invention besides the huge functional advantage in improving cooling air fluid dynamics with consequent removal of obstructions and stoppages of the crusher 1 and the fine ash recuperators 15 , provides a more comfortable and faster milling also of large ash agglomerates at high temperature, helping, by an indirect cooling of the milling members 9 , in increasing the expected life of the crusher 1 .

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Crushing And Grinding (AREA)
  • Processing Of Solid Wastes (AREA)
  • Crushing And Pulverization Processes (AREA)
  • Disintegrating Or Milling (AREA)
  • Solid Fuels And Fuel-Associated Substances (AREA)
  • Gasification And Melting Of Waste (AREA)
US12/225,050 2006-03-13 2007-03-09 System For Milling And Air-Water Cooling Bottom Ash From Heating Furnaces For Solid Fuels Abandoned US20090173258A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
IT000437A ITMI20060437A1 (it) 2006-03-13 2006-03-13 Sistema di frantumazione e raffreddamento ad aria ed acqua di ceneri pesanti per caldaie a combustibile solido
ITMI2006A000437 2006-03-13
PCT/EP2007/002123 WO2007104502A1 (en) 2006-03-13 2007-03-09 System for milling and air-water cooling bottom ash from heating furnaces for solid fuels

Publications (1)

Publication Number Publication Date
US20090173258A1 true US20090173258A1 (en) 2009-07-09

Family

ID=38190720

Family Applications (1)

Application Number Title Priority Date Filing Date
US12/225,050 Abandoned US20090173258A1 (en) 2006-03-13 2007-03-09 System For Milling And Air-Water Cooling Bottom Ash From Heating Furnaces For Solid Fuels

Country Status (13)

Country Link
US (1) US20090173258A1 (xx)
EP (1) EP2002182A1 (xx)
JP (1) JP2009529416A (xx)
KR (1) KR20090016546A (xx)
CN (1) CN101438101A (xx)
AU (1) AU2007224695A1 (xx)
BR (1) BRPI0709295A2 (xx)
CA (1) CA2645669A1 (xx)
EA (1) EA014566B1 (xx)
IT (1) ITMI20060437A1 (xx)
MX (1) MX2008011726A (xx)
WO (1) WO2007104502A1 (xx)
ZA (1) ZA200807815B (xx)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120183376A1 (en) * 2009-09-24 2012-07-19 Mario Magaldi System for extraction and transport of light ashes by means of a steel belt conveyor

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009150667A2 (en) * 2008-06-13 2009-12-17 Datta Ashok Kumar Multi-port twin-compartment fly-ash hoper for disposal of fly-ash in dry state
CN101644439B (zh) * 2009-08-31 2011-07-27 北京国电富通科技发展有限责任公司 一种燃煤锅炉炉底排渣装置
USD901583S1 (en) 2018-01-04 2020-11-10 Samsung Electronics Co., Ltd. Type font

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988473A (en) * 1931-12-16 1935-01-22 American Eng Co Ltd Hopper
US2375487A (en) * 1941-08-11 1945-05-08 Allis Chalmers Mfg Co Clinker cooling
US5255615A (en) * 1990-03-02 1993-10-26 Mario Magaldi System for discharging bottom ash from steam-producing boilers
US5309848A (en) * 1992-09-29 1994-05-10 The Babcock & Wilcox Company Reversible, wear-resistant ash screw cooler section
WO2003103839A1 (en) * 2002-06-07 2003-12-18 Yong Kwon Jo Crushers
WO2005078346A1 (en) * 2004-02-12 2005-08-25 Magaldi Ricerche E Brevetti S.R.L. Pre-crushing device for a conveyor/cooler of hot loose materials

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS545530B2 (xx) * 1972-09-08 1979-03-17
JPH06206224A (ja) * 1993-01-12 1994-07-26 Hitachi Chem Co Ltd 熱硬化性樹脂成形品の粉砕方法ならびに粉砕装置
IT1282773B1 (it) * 1996-05-31 1998-03-31 Magaldi Ricerche & Brevetti Procedimento di ricircolo di ceneri prodotte da caldaie per la produzione di vapore
JP2002126552A (ja) * 2000-10-24 2002-05-08 Fuji Car Mfg Co Ltd 破砕装置
JP4236474B2 (ja) * 2003-01-31 2009-03-11 日立建機株式会社 自走式破砕機及びこれに用いる選別搬送装置

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1988473A (en) * 1931-12-16 1935-01-22 American Eng Co Ltd Hopper
US2375487A (en) * 1941-08-11 1945-05-08 Allis Chalmers Mfg Co Clinker cooling
US5255615A (en) * 1990-03-02 1993-10-26 Mario Magaldi System for discharging bottom ash from steam-producing boilers
US5309848A (en) * 1992-09-29 1994-05-10 The Babcock & Wilcox Company Reversible, wear-resistant ash screw cooler section
WO2003103839A1 (en) * 2002-06-07 2003-12-18 Yong Kwon Jo Crushers
WO2005078346A1 (en) * 2004-02-12 2005-08-25 Magaldi Ricerche E Brevetti S.R.L. Pre-crushing device for a conveyor/cooler of hot loose materials

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120183376A1 (en) * 2009-09-24 2012-07-19 Mario Magaldi System for extraction and transport of light ashes by means of a steel belt conveyor

Also Published As

Publication number Publication date
ZA200807815B (en) 2009-07-29
KR20090016546A (ko) 2009-02-16
ITMI20060437A1 (it) 2007-09-14
BRPI0709295A2 (pt) 2011-07-05
CA2645669A1 (en) 2007-09-20
WO2007104502A1 (en) 2007-09-20
CN101438101A (zh) 2009-05-20
MX2008011726A (es) 2008-10-29
EA014566B1 (ru) 2010-12-30
JP2009529416A (ja) 2009-08-20
EA200801844A1 (ru) 2009-02-27
EP2002182A1 (en) 2008-12-17
AU2007224695A1 (en) 2007-09-20

Similar Documents

Publication Publication Date Title
KR970011015B1 (ko) 증기생산 보일러의 바닥재(bottom ash) 배출시스템
US20100170425A1 (en) Cooling system for the dry extraction of heavy ashes from boilers
US20090173258A1 (en) System For Milling And Air-Water Cooling Bottom Ash From Heating Furnaces For Solid Fuels
EP2032899B1 (en) Cooling system for dry extraction of heavy bottom ash for furnaces during the storing step at the hopper
CN102580832B (zh) 适用于干式排渣机的隔离碎渣装置及其方法
WO2005078346A1 (en) Pre-crushing device for a conveyor/cooler of hot loose materials
EP1807657A1 (en) Cyclone bypass for a circulating fluidized bed reactor
JP5539598B2 (ja) 総ボイラー効率を高めながら重灰を冷却及び抽出するシステム及び方法
JP2012511692A (ja) 高効率での大量の重灰流の抽出および冷却システム
US3734414A (en) Device for crushing hot furnace discharge material, particularly hot alumina
CN202410788U (zh) 适用于干式排渣机的隔离碎渣装置
CN220812493U (zh) 一种进风装置残渣、焦炭反吹装置
KR100975210B1 (ko) 집진기의 수분 제거장치
KR200291552Y1 (ko) 미분탄제조설비의산소농도제어장치
CN210532689U (zh) 一种新型热风机
JP2003001141A (ja) 微粉炭機の入口空気流量検出装置
KR20090046945A (ko) 보일러로부터 중회분 건조 추출을 위한 냉각 시스템
CN113551526A (zh) 一种降低烧结点火炉炉膛负压的方法
JPS5850782B2 (ja) 粉体分級方法及び装置
KR20090050087A (ko) 대량의 중회분에 대한 추출 및 공기/수분 냉각 시스템
KR20130070009A (ko) Ｃｄｑ 집진더스트를 이용한 보일러 급수 예열장치

Legal Events

Date Code Title Description
AS Assignment

Owner name: MAGALDI RICERCHE E BREVETTI S.R.L., ITALY

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:MAGALDI, MARIO;REEL/FRAME:022206/0100

Effective date: 20081107

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION