WO2007104502A1 - 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 PDFInfo
- Publication number
- WO2007104502A1 WO2007104502A1 PCT/EP2007/002123 EP2007002123W WO2007104502A1 WO 2007104502 A1 WO2007104502 A1 WO 2007104502A1 EP 2007002123 W EP2007002123 W EP 2007002123W WO 2007104502 A1 WO2007104502 A1 WO 2007104502A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- crusher
- ash
- milling
- air
- cooling system
- Prior art date
Links
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.
- 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 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)
- Gasification And Melting Of Waste (AREA)
- Disintegrating Or Milling (AREA)
- Solid Fuels And Fuel-Associated Substances (AREA)
Abstract
Description
Claims
Priority Applications (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/225,050 US20090173258A1 (en) | 2006-03-13 | 2007-03-09 | System For Milling And Air-Water Cooling Bottom Ash From Heating Furnaces For Solid Fuels |
AU2007224695A AU2007224695A1 (en) | 2006-03-13 | 2007-03-09 | System for milling and air-water cooling bottom ash from heating furnaces for solid fuels |
MX2008011726A MX2008011726A (en) | 2006-03-13 | 2007-03-09 | System for milling and air-water cooling bottom ash from heating furnaces for solid fuels. |
BRPI0709295-4A BRPI0709295A2 (en) | 2006-03-13 | 2007-03-09 | air and water grinding and cooling system for waste ash heating furnaces for solid fuels |
JP2008558694A JP2009529416A (en) | 2006-03-13 | 2007-03-09 | Grinding of bottom ash from solid fuel furnace and air / water cooling equipment |
CA002645669A CA2645669A1 (en) | 2006-03-13 | 2007-03-09 | System for milling and air-water cooling bottom ash from heating furnaces for solid fuels |
EA200801844A EA014566B1 (en) | 2006-03-13 | 2007-03-09 | System for milling and air-water cooling bottom ash from heating furnaces for solid fuels |
EP07723173A EP2002182A1 (en) | 2006-03-13 | 2007-03-09 | System for milling and air-water cooling bottom ash from heating furnaces for solid fuels |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
ITMI2006A000437 | 2006-03-13 | ||
IT000437A ITMI20060437A1 (en) | 2006-03-13 | 2006-03-13 | AIR AND WATER-BASED CRUSHING AND COOLING SYSTEM FOR HEAVY ASH FOR BOILERS WITH SOLID FUEL |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2007104502A1 true WO2007104502A1 (en) | 2007-09-20 |
Family
ID=38190720
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
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 |
Country Status (13)
Country | Link |
---|---|
US (1) | US20090173258A1 (en) |
EP (1) | EP2002182A1 (en) |
JP (1) | JP2009529416A (en) |
KR (1) | KR20090016546A (en) |
CN (1) | CN101438101A (en) |
AU (1) | AU2007224695A1 (en) |
BR (1) | BRPI0709295A2 (en) |
CA (1) | CA2645669A1 (en) |
EA (1) | EA014566B1 (en) |
IT (1) | ITMI20060437A1 (en) |
MX (1) | MX2008011726A (en) |
WO (1) | WO2007104502A1 (en) |
ZA (1) | ZA200807815B (en) |
Cited By (2)
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 |
US20120160141A1 (en) * | 2009-08-31 | 2012-06-28 | Beijing Guodian Futong Science And Technology Development Co., Ltd. | Bottom ash discharging device for coal-fired boiler |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
IT1396049B1 (en) * | 2009-09-24 | 2012-11-09 | Magaldi Ind Srl | ASH EXTRACTION AND TRANSPORTATION SYSTEM READ THROUGH THE STEEL TAPE CONVEYOR. |
USD901583S1 (en) | 2018-01-04 | 2020-11-10 | Samsung Electronics Co., Ltd. | Type font |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1988473A (en) * | 1931-12-16 | 1935-01-22 | American Eng Co Ltd | Hopper |
EP0471055B1 (en) * | 1990-03-02 | 1995-07-26 | MAGALDI, Mario | Steam generating system and method for discharge of ash |
WO1997045675A1 (en) * | 1996-05-31 | 1997-12-04 | Magaldi Ricerche E Brevetti S.R.L. | Process for recirculating ashes generated by steam producing boilers |
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 (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2375487A (en) * | 1941-08-11 | 1945-05-08 | Allis Chalmers Mfg Co | Clinker cooling |
JPS545530B2 (en) * | 1972-09-08 | 1979-03-17 | ||
US5309848A (en) * | 1992-09-29 | 1994-05-10 | The Babcock & Wilcox Company | Reversible, wear-resistant ash screw cooler section |
JPH06206224A (en) * | 1993-01-12 | 1994-07-26 | Hitachi Chem Co Ltd | Method and apparatus for grinding thermosetting resin molded product |
JP2002126552A (en) * | 2000-10-24 | 2002-05-08 | Fuji Car Mfg Co Ltd | Crushing device |
JP4236474B2 (en) * | 2003-01-31 | 2009-03-11 | 日立建機株式会社 | Self-propelled crusher and sorting and conveying device used therefor |
-
2006
- 2006-03-13 IT IT000437A patent/ITMI20060437A1/en unknown
-
2007
- 2007-03-09 US US12/225,050 patent/US20090173258A1/en not_active Abandoned
- 2007-03-09 CN CNA2007800134752A patent/CN101438101A/en active Pending
- 2007-03-09 BR BRPI0709295-4A patent/BRPI0709295A2/en not_active IP Right Cessation
- 2007-03-09 CA CA002645669A patent/CA2645669A1/en not_active Abandoned
- 2007-03-09 WO PCT/EP2007/002123 patent/WO2007104502A1/en active Application Filing
- 2007-03-09 MX MX2008011726A patent/MX2008011726A/en not_active Application Discontinuation
- 2007-03-09 AU AU2007224695A patent/AU2007224695A1/en not_active Abandoned
- 2007-03-09 EA EA200801844A patent/EA014566B1/en not_active IP Right Cessation
- 2007-03-09 EP EP07723173A patent/EP2002182A1/en not_active Withdrawn
- 2007-03-09 JP JP2008558694A patent/JP2009529416A/en active Pending
- 2007-03-09 KR KR1020087023497A patent/KR20090016546A/en not_active Application Discontinuation
-
2008
- 2008-09-11 ZA ZA200807815A patent/ZA200807815B/en unknown
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US1988473A (en) * | 1931-12-16 | 1935-01-22 | American Eng Co Ltd | Hopper |
EP0471055B1 (en) * | 1990-03-02 | 1995-07-26 | MAGALDI, Mario | Steam generating system and method for discharge of ash |
WO1997045675A1 (en) * | 1996-05-31 | 1997-12-04 | Magaldi Ricerche E Brevetti S.R.L. | Process for recirculating ashes generated by steam producing boilers |
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 (5)
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 |
WO2009150667A3 (en) * | 2008-06-13 | 2010-02-18 | Datta Ashok Kumar | Multi-port twin-compartment fly-ash hoper for disposal of fly-ash in dry state |
US20120160141A1 (en) * | 2009-08-31 | 2012-06-28 | Beijing Guodian Futong Science And Technology Development Co., Ltd. | Bottom ash discharging device for coal-fired boiler |
US8746157B2 (en) * | 2009-08-31 | 2014-06-10 | Beijing Guodian Futong Science And Technology Development Co., Ltd. | Bottom ash discharging device for coal-fired boiler |
AU2010286194B2 (en) * | 2009-08-31 | 2014-06-19 | Beijing Guodian Futong Science And Technology Development Co., Ltd. | Device for discharging slag from bottom of coal-fired boiler |
Also Published As
Publication number | Publication date |
---|---|
CA2645669A1 (en) | 2007-09-20 |
JP2009529416A (en) | 2009-08-20 |
BRPI0709295A2 (en) | 2011-07-05 |
EA014566B1 (en) | 2010-12-30 |
MX2008011726A (en) | 2008-10-29 |
AU2007224695A1 (en) | 2007-09-20 |
ITMI20060437A1 (en) | 2007-09-14 |
US20090173258A1 (en) | 2009-07-09 |
CN101438101A (en) | 2009-05-20 |
EA200801844A1 (en) | 2009-02-27 |
EP2002182A1 (en) | 2008-12-17 |
ZA200807815B (en) | 2009-07-29 |
KR20090016546A (en) | 2009-02-16 |
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