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1. 发明专利

JPS58208508A NOX EMISSION CONTROL METHOD FOR BOILER 失效
公开(公告)号：JPS58208508A
公开(公告)日：1983-12-05
申请号：JP9030082
申请日：1982-05-27
申请人： MITSUBISHI HEAVY IND LTD , RYONICHI ENG
发明人： KOBAYASHI KEIICHI , KONDOU JIYUNICHI , NAKADA KAZUHIKO
IPC分类号： F23C99/00
摘要： PURPOSE:To achieve a SI control in accordance with a boiler load with an inexpensive device, by arranging such that an opening/closing valve is provided a line through which a steam or water is fed into a furnace burning zone of a boiler, and the opening/closing valve is caused to open and close alternately in a given frequency and in such a manner that the larger a boiler load is, the longer the opening/closing valve is retained as opened. CONSTITUTION:An opening time T1 of an electromagnetic valve 4 is determined by means of a function generator 2 adapted to set phiN time in response to a load sensor 1. This signal T1 is utilized by a timing producing circuit 3 to produce a phiN-phiFF frequency signal of the opening time T1 for opening and closing the electromagnetic valve 4 alternately in a given frequency. When a boiler is operated at a maximum load, a timing is kept at phiN in any case and an output from the function generator 2 becomes as T1=T, and thereby allowing the electromagnetic valve 4 to retain as opened. When a boiler load is less than Le, the output becomes T1=O, causing the electromagnetic valve 4 to continue to be closed.

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