Method for preventing ignition and device for preventing ignition in pulverizer
A pulverizer, oxygen partial pressure technology, applied in the direction of combustion method, supply configuration, block/powder fuel preparation, etc., to achieve the effect of preventing fire and explosion, and preventing fire
Inactive Publication Date: 2013-01-16
KOBE STEEL LTD
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Problems solved by technology
[0019] However, at present, there is no operating index for solid fuels with low ignition temperatures that have not yet been expected.
Method used
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[0035]Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. In addition, in the following embodiments, coal is used as a solid fuel and described, but the solid fuel is not limited to this, and may be biomass fuel, sludge carbide, etc., and coal, biomass fuel, etc. may also be used. , Sludge carbide, etc. Two or more.
[0036] (The structure of the fire prevention device of the pulverizer)
[0037] The fire prevention device 10 of the pulverizer of this embodiment, such as figure 1 As shown, there are the following mechanisms: an air supply device (air supply mechanism) 12 that supplies conveying air (air) to the pulverizer 5; a gas supply device (gas supply mechanism) that supplies a gas with an oxygen partial pressure lower than air to the pulverizer 5 mechanism) 13; an air supply adjusting device 14 for adjusting the supply of air supplied to the pulverizer 5; a gas supply adjusting device (gas supply) for adjusting ...
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The disclosed device includes: an air supplying means (12) that supplies air; a gas supplying means (13) that supplies a gas in which the partial pressure of oxygen is lower than the partial pressure of oxygen in air; a gas-supply-amount adjustment means (15) that adjusts the amount of the gas supplied; a carbon-monoxide-concentration measurement means (7) and an oxygen-concentration measurement means (6) that respectively measure the concentration of carbon monoxide and the concentration of oxygen at the exit of a pulverizer (5). In the pulverizer (5), which is for pulverizing solid fuel and to which the air and the gas are supplied as a mixed gas, the gas-supply-amount adjustment means (15) is controlled by a control means (11) on the basis of the measurement results of the carbon-monoxide-concentration measurement means (7) and the oxygen-concentration measurement means (6) in a manner so as to change the partial pressure of oxygen in the mixed gas supplied to the pulverizer (5). With this constitution, ignition within the pulverizer (5) can be prevented.
Description
technical field [0001] The present invention relates to a fire prevention method and fire prevention device for a pulverizer that pulverizes solid fuel used as boiler fuel. Background technique [0002] In the boiler using solid fuel as fuel, the solid fuel pulverized by the pulverizer is supplied together with transport air. [0003] In Japan, since bituminous coal with a high ignition temperature is used as fuel for boilers, little attention has been paid to fires caused by pulverizers. On the contrary, in the early pulverized coal combustion boilers, as a countermeasure against fire, a system for supplying inert gas (steam, etc.) and a rupture disk (rupture disk) were installed in the pulverizer. [0004] On the other hand, in foreign countries, especially the United States, in the 1980s, due to the use of low-quality coal produced in the west, there were many lessons learned from fires and explosions in pulverizers. In the future, there will be more opportunities for J...
Claims
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IPC IPC(8): F23K3/02B02C23/04B02C25/00F23K1/00
CPCF23K1/00F23K2201/1006F23K3/02B02C23/04F23K2201/10B02C25/00F23K2203/102
Inventor 秋山胜哉朴海洋田洼阳司
Owner KOBE STEEL LTD