| abstract |
The utility model discloses a kind of boiler at low load flue gas denitrification system, it includes boiler back end ductwork and SCR reactors, boiler back end ductwork is divided into upper flue and lower flue by heat transmission equipment, the gas outlet of lower flue is connected with the air inlet of SCR reactors, and the air inlet of SCR reactors is also connected by bypass flue with upper flue.The utility model has the advantage of, regulation homogenizing plate and constent temperature heater are set in bypass flue, the boiler flue gas flow more uniform, temperature entered in SCR reactors by bypass flue is set more to stablize, the fluctuation of the flow and temperature because of the boiler smoke that boiler enters in SCR reactors under underload or load fluctuation situation can be avoided, the activity of SCR catalyst in reactor is improve, and then improves denitration efficiency；Meanwhile, make SCR reactor denitration efficiency long-time stables in high-level scope, ammonia spraying amount is reduced, it is final to reduce denitration cost. |