An apparatus for denitration of exhaust gas

Claim 1

An apparatus for denitrating exhaust gas, comprising: means (18, 9) for detecting the concentration of nitrogen oxide in an exhaust gas from an incinerator (1); means for obtaining information concerning the burning status of said incinerator related to the amount of generated nitrogen oxide; means (30) for determining the amount of ammonia to be injected according to the obtained information; and means (13) for injecting ammonia into said incinerator (1) according to the determined amount of injection, characterized in that said means for obtaining information includes: temperature detection means (12) for detecting the temperature of a zone (3), into which said ammonia is injected; wherein said means (30) for determining the amount of ammonia includes: means (32) for obtaining an output for correcting an injection amount control parameter according to said obtained information; means (16) for obtaining the difference between a set value of generated nitrogen oxide and detected nitrogen oxide concentration; and injection amount feedback control means (31) for obtaining an injection amount of ammonia according to said parameter correction output and difference.