| 摘要 |
PURPOSE:To contrive to inactivate a coal pulverizing system by a method wherein either simple one kind fluid or two kinds of fluids properly mixed of combustion exhaust gas and combustion air are used as pulverized coal carrier and as well as the exhaust gas obtained at the outlet of an air preheater is utilized as heat source for drying a pulverizer. CONSTITUTION:Coal in a storage tank 24 is pulverized by the pulverizer 22 and, after that, separated and collected in a cyclone 26, a bag filter 27 and the like and then stored in a pulverized coal storage tank 28. The exhaust gases, which are prepared by mixing low temperature combustion exhaust gas and high temperature combustion exhaust gas respectively, are extracted by means of flues 36 and 37 and regulated by means of dampers 38 so as to produce the predetermined temperature after mixing, and the combustion air, which is supplied by means of a forced draft fan 9 and regulated its temperature by means of dampers 31, are employed as the carrier for the pulverized coal in the storage tank 28. In addition, a flow meter and an oxygen densitometer are provided at the inlets of pulverized coal pipes 41 in order to control the carrier so that the predetermined oxygen density and flow rate are realized by means of controlling mechanism. On the other hand, the pulverized coal the storage tank 28 is controlled by mechanical stokers 30 so as to be mixed with the carrier by means of ejectors 43 in order to be carried to a burner 2. |
