Two-phase porous drainage nozzle in cement furnace gas denitration system

Abstract

The invention discloses a two-phase porous drainage nozzle in a cement furnace gas denitration system, aiming at providing a two-phase porous drainage nozzle in a cement furnace gas denitration system for effectively solving the problem of uneven reductant injection used in an SNCR gas denitration system of a cement furnace, comprising a liquid feeding pipe, a liquid flowing pipe, a gas feeding pipe, an air compression pipe, an air ejector nozzle and a sleeve, wherein the liquid feeding pipe and the liquid flowing pipe are in threaded connection; the gas feeding pipe and the air compression pipe are in gastight buckling connection; the air compression pipe extends into the liquid flowing pipe, and the connection part of the two pipes is welded; the air ejector nozzle is respectively connected with the air compression pipe and the liquid flowing pipe by welding; and a reducing agent drainage hole is arranged in the liquid flowing pipe. The two-phase porous drainage nozzle in a cement furnace gas denitration system disclosed by the invention is reasonable in structure, and has the advantages of great injection dose of the nozzle, good atomization effect, and greatly improved drug use efficiency.

Description

technical field [0001] The invention relates to a nozzle, in particular to a dual-phase porous drainage nozzle used in an SNCR flue gas denitrification system of a cement kiln. Background technique [0002] In the field of cement kiln flue gas denitrification, the method of non-selective catalytic reduction (SNCR) has been widely recommended by the industry. Practice has proved that this method has the best effect with NH3 as the reducing agent. The SNCR method is to spray an aqueous reducing agent solution such as ammonia or urea into the flue gas at 850°C-1150°C to realize the reduction reaction of NOX. Because it basically does not occupy the space of combustion equipment, the transformation workload is small, and the transformation period is short, so it has been widely used. [0003] The core of SNCR technology is its injection system. In the prior art, single-hole pressure nozzles are generally used, and the atomization effect is not good, and the same nozzle has on...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems existing in the background technology, the purpose of the present invention is to provide an SNCR flue gas denitrification system used in cement kilns to effectively solve the problems of uneven spraying of reducing agent and poor atomization effect, and improve the use efficiency of reducing agent Reduce the operating cost of the system, thereby improving the denitrification efficiency of the system, reduce the secondary pollution of ammonia escape in the flue gas emission, and realize the efficient and reliable operation of the SNCR device in the cement kiln. Dual-phase porous drainage nozzle in the cement kiln flue gas denitrification system

Images