32results about How to "Improve the efficiency of denitrification reaction" patented technology

The invention discloses a high-temperature and high-dust SCR denitrification device for a cement kiln, which includes a reaction component and an ammonia injection component. The hole overflows into the connecting pipe, and the connecting pipe, connecting plate and ammonia storage tank form an ammonia circulation pipeline. The ammonia gas enters the nozzle from the circulation pipeline and overflows into the reaction vessel body to react with flue gas. The power output end of the motor Drive the rotating cover to rotate to realize the rotation process of the connecting pipe. The connecting pipe drives the connecting plate, ammonia storage tank and ammonia delivery pipe to move together, so that the overflow point of ammonia gas changes continuously inside the reaction vessel body, and the setting of the rubber ring does not affect The moving process of the ammonia pipe can also ensure the airtightness of the reaction vessel to the greatest extent, so that the flue gas inside the reaction vessel can fully react with the ammonia gas, avoid the uneven reaction between the flue gas and the ammonia gas, and improve the denitrification reaction efficiency.

The invention relates to the technical field of boiler improvement, in particular to a composite denitration method and device suitable for power station boilers, industrial boilers and other burning devices. A method is provided, reducibility industrial waste gas serves as a composite additive, on one hand, the reducibility industrial waste gas serves as reburning gas to reduce nitric oxide in the reducing atmosphere, the amount of nitric oxide generated through burning is reduced; and on the other hand, the SNCR reaction temperature is reduced, the SNCR proper temperature area is widened, the reduction of nitric oxide through SNCR is promoted, accordingly, the denitration rate is increased, and ammonia leakage is reduced. The industrially-common reducibility waste gas is effectively and resourcefully utilized, meanwhile, the burning denitration efficiency of a boiler is improved from two aspects, and the emission load of nitric oxide is reduced by more than 80%. The boiler equipment is simple, implementation is easy, the adopted additive is low in price and easy to obtain, the burning process in the boiler is not affected, obvious secondary pollution cannot be generated, and reliability is high. The method is mainly applied to the industrial waste gas reutilization and nitric oxide control aspects.

The present invention discloses a SCR system automatic control method based on ammonia spraying sensitive valve locking. The method comprises three steps: firstly, performing comprehensive analysis of varying load condition operation characteristics of the SCR system based on a field test and a CFD numerical simulation technology to obtain flue gas 'NOx flow' regional continuous distribution characteristics matching an AIG type; then determining the weight of each ammonia spraying branch pipe valve, locking a certain number of sensitive valves according to a preset sensitive valve locking principle, and installing an automatic regulating valve at a corresponding ammonia spraying region; finally, developing an ammonia spraying logic controller and corresponding main control and sub-control logics, realizing multistage optimization setting of parameters of the control system, and realizing the accurate automatic control of the main ammonia spraying regulating valve of the SCR system and the locking sensitive valves. The SCR system automatic control method based on ammonia spraying sensitive valve locking is able to overcome the problems of characteristics of the SCR system such as nonlinearity, large delay and the like so as to realize the accurate automatic control of the ammonia spraying of the SCR system, substantially enhance the SCR denitration reaction efficiency, save the dosage of ammonia, reduce the ammonia escape and effectively inhibit the generation of ABS.

The invention discloses a reverse multi-point swirl-injection denitrating device. The reverse multi-point swirl-injection denitrating device comprises a reverse multi-point swirl injector for denitrating flue gas, a flue gas passage communicated with the gas inlet end and the gas outlet end of the reverse multi-point swirl injector, and a denitrating agent passage communicated with the interior of the reverse multi-point swirl injector, wherein a plurality of swirl tubes parallel to the axis of the reverse multi-point swirl injector are arranged inside the reverse multi-point swirl injector; a denitrating agent inlet communicated with the denitrating agent passage is arranged on each swirl tube; two inclined swirl plates which are vertically symmetrical are arranged on the side, near the gas inlet end of the reverse multi-point swirl injector, of each denitrating agent inlet. The reverse multi-point swirl-injection denitrating device can mix the flue gas and the denitrating agent thoroughly, so that the problem that the flue gas removing efficiency is low is solved.

The present invention relates to the technical field of industrial furnace flue gas nitrogen oxide treatment, in particular to a cement pit flue gas denitrification device and its use method. SNCR denitration reaction unit, preheater, low-temperature dust removal unit, SCR denitration reaction unit and chimney, the SNCR denitration reaction unit includes a first mixer; the SCR denitration reaction unit includes a second mixer connected in sequence along the flue gas direction and an SCR reactor; the ammonia source injects ammonia into the first mixer and the second mixer respectively; the low-temperature dust removal unit includes a low-temperature dust collector. The cement pit flue gas denitrification device provided by the invention reduces the denitrification operation cost on the basis of ensuring the denitrification efficiency.