Method for operating pulverized coal-fired boiler facility
A technology of boiler equipment and operation method, which is applied to combustion methods, combustion equipment, burners for burning powder fuel, etc., can solve the problems of no oxygen concentration, cumbersome transformation, etc., and achieve the effect of preventing fire, suppressing equipment transformation, and safe use
Inactive Publication Date: 2014-03-05
KOBE STEEL LTD
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Problems solved by technology
However, most of the currently operating pulverized coal combustion boilers use air (fresh air) as gas for drying and transporting pulverized coal as described in Citation Documents 1 to 3 as conventional examples. When unused air ( When the above-mentioned technology described in Citation 2 of Fresh Air) is applied to an existing pulverized coal combustion boiler, a large number of cumbersome modifications are required
It should be noted that Cited Document 3 does not address the prevention of ignition of pulverized coal as a subject, and in particular there is no description related to the oxygen concentration of the gas supplied to the coal pulverization device.
Method used
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Embodiment Construction
[0035] Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, in the following description, the pulverized coal combustion boiler facility which concerns on one Embodiment of this invention is demonstrated after the conventional normal pulverized-coal combustion boiler facility is demonstrated.
[0036] (Existing pulverized coal combustion boiler equipment)
[0037] Such as image 3 As shown, the existing common pulverized coal combustion boiler equipment 200 is equipped with, for example, a boiler furnace 1, a coal economizer 2, a denitrification tower 3, an electric dust collector 4, an IDF5 (induction fan), a desulfurization tower 6, a chimney 7, and a hopper 14 , Mill 21 (coal crushing device), GAH8 (gas heater), FDF9 (external air pressure fan), primary air fan 10 and control unit 17. A gas thermometer 15 is attached to the mill outlet of the outlet pipe of the mill 21 , and a gas flow meter 16 is attached to the...
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Provided is a method for operating a pulverized coal-fired boiler facility, wherein upgraded low-grade coal can be safely used as fuel and an existing facility needs little remodeling. The present invention relates to a method for operating a pulverized coal-fired boiler facility (100) that uses upgraded brown coal as fuel. Boiler exhaust gas taken out of an exhaust gas duct (31) is added to air from a primary air fan (10) to prepare mixed gas with an oxygen concentration of less than 12% in a volume ratio, the mixed gas is caused to separately flow to a carrier gas duct (33) that goes through a GAH (8) and a bypass carrier gas duct (34) that bypasses the GAH (8), and thereafter the mixed gas is supplied to a mill (21).
Description
technical field [0001] The invention relates to an operation method of pulverized coal combustion boiler equipment. In particular, it relates to a gas supply method to a coal crushing device (mill) constituting a pulverized coal combustion boiler facility. Background technique [0002] As documents related to such techniques, there are Patent Documents 1 to 3, for example. Patent Document 1 describes a technique of supplying a mixed gas (conveying gas) of air (combustion air) and boiler exhaust gas that has passed through an air preheater to a coal crushing device. Since the oxygen concentration of boiler exhaust gas is lower than that of air, the oxygen concentration of the mixed gas of boiler exhaust gas and air is lower than that of air. By supplying this mixed gas to the coal pulverization device, it is possible to prevent ignition of the pulverized coal in the coal pulverization device. In addition, it is described that the oxygen concentration of the mixed gas is pr...
Claims
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IPC IPC(8): F23K3/02
CPCF23L7/00Y02E20/344F23K2201/20F23N2021/12F23D1/005F23K2201/103F23J2217/102F23C2202/50F23C9/003F22B35/002F23C2202/30F23J2219/40F23K3/00F22B1/02F22B37/008F22B1/18F23N2221/12Y02E20/32F23C9/00F23K3/02F23K5/16
Inventor 多田俊哉
Owner KOBE STEEL LTD