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1. JP2013019638 - 微粉炭焚きボイラ設備の運転方法および微粉炭焚きボイラ設備

官庁 日本
出願番号 2011154894
出願日 13.07.2011
公開番号 2013019638
公開日 31.01.2013
特許番号 5789146
特許付与日 07.08.2015
公報種別 B2
IPC
F23K 3/02
F機械工学;照明;加熱;武器;爆破
23燃焼装置;燃焼方法
K燃焼装置への燃料の供給
3塊状または粉状燃料の燃焼装置への供給または分配
02空気式供給装置,すなわち空気送風によるもの
CPC
F22B 1/18
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
22STEAM GENERATION
BMETHODS OF STEAM GENERATION; STEAM BOILERS
1Methods of steam generation characterised by form of heating method
02by exploitation of the heat content of hot heat carriers
18the heat carrier being a hot gas, e.g. waste gas such as exhaust gas of internal-combustion engines
F22B 35/002
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
22STEAM GENERATION
BMETHODS OF STEAM GENERATION; STEAM BOILERS
35Control systems for steam boilers
002Control by recirculating flue gases
F22B 37/008
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
22STEAM GENERATION
BMETHODS OF STEAM GENERATION; STEAM BOILERS
37Component parts or details of steam boilers
008Adaptations for flue gas purification in steam generators,
F23C 9/003
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  ; A CARRIER GAS OR; AIR 
9Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
003for pulverulent fuel
F23C 2202/30
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  ; A CARRIER GAS OR; AIR 
2202Fluegas recirculation
30Premixing fluegas with combustion air
F23C 2202/50
FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
23COMBUSTION APPARATUS; COMBUSTION PROCESSES
CMETHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN  ; A CARRIER GAS OR; AIR 
2202Fluegas recirculation
50Control of recirculation rate
出願人 KOBE STEEL LTD
株式会社神戸製鋼所
発明者 TADA TOSHIYA
多田 俊哉
代理人 特許業務法人梶・須原特許事務所
発明の名称
(EN) METHOD FOR OPERATING PULVERIZED COAL-FIRED BOILER FACILITY
(JA) 微粉炭焚きボイラ設備の運転方法および微粉炭焚きボイラ設備
要約
(EN)

PROBLEM TO BE SOLVED: To provide a method for operating a pulverized coal-fired boiler facility capable of safely using upgraded low-grade coal as fuel of the pulverized coal-fired boiler and of using the upgraded low-grade coal as fuel without the need to remodel an existing pulverized coal-fired boiler facility so much.

SOLUTION: The method for operating a pulverized coal-fired boiler facility 100 using upgraded brown coal as fuel. Boiler exhaust gas taken out of an exhaust gas duct 31 between a desulfurizing tower 6 and a chimney 7 is added to air from a primary air fan 10 to prepare mixed gas. Then, the mixed gas is caused to separately flow to a carrier gas duct 33 through a GAH 8 and a bypass carrier gas duct 34 that bypasses the GAH 8. After this, the mixed gas is supplied to a mill 21. A mixed gas with an oxygen concentration of less than 12% in a volume ratio is supplied to the mill 21.

COPYRIGHT: (C)2013,JPO&INPIT

(JA)

【課題】微粉炭焚きボイラの燃料として改質低品位炭を安全に使用できるとともに、既設の微粉炭焚きボイラの設備改造が少なくて済む改質低品位炭を燃料とする微粉炭焚きボイラ設備の運転方法を提供すること。
【解決手段】改質褐炭を燃料とする微粉炭焚きボイラ設備100の運転方法である。脱硫塔6と煙突7との間の排ガスダクト31から取り出したボイラ排ガスを一次空気ファン10からの空気に添加して混合ガスとした後、GAH8を経由する搬送ガスダクト33とGAH8を迂回するバイパス搬送ガスダクト34とに当該混合ガスを分けて流し、その後、当該混合ガスをミル21に供給する。酸素濃度を体積比で12%未満とした混合ガスをミル21に供給する。
【選択図】図1