Composite laminated reducing agent high-speed injection device

Abstract

The invention relates to a composite laminated reducing agent high-speed injection device which is made of a high-temperature-resistant wear-resistant material and comprises a cylindrical shell, a laminated composite nozzle having a reducing agent A nozzle and a reducing agent B nozzle, a reducing agent A channel, a reducing agent B channel and a swing driving mechanism; the spraying device is arranged on the boiler wall of the boiler combustion area; the composite nozzle is arranged on the cylinder opening of the shell along with the limiting shaft and capable of up-down swing, reducing agents are injected into a main combustion area of a reducing atmosphere through respective nozzles to participate in low-nitrogen combustion with the functions of restraining the NOx generation amount and reducing generated NOx. Meanwhile, high-speed airflow sprayed out of the nozzle is beneficial to sufficient mixing of the reducing agent and the flue gas, a flow field is optimized, local high-temperature generation is avoided, thermal NOx is reduced, and ultralow emission of NOx in the flue gas is achieved. The gas flow of the reducing agent B can prevent the nozzle from slagging and prevent the reducing agent A from being oxidized and protected; the device is simple and reasonable in structure, reliable in work and long in service life, and can meet the use requirements of simultaneously spraying various reducing agents on the furnace wall.

Description

technical field [0001] The invention relates to the technical field of boiler combustion devices, in particular to a composite laminated reducing agent high-speed injection device suitable for simultaneously injecting multiple reducing agents to the high-temperature combustion area of ​​the boiler as required. Background technique [0002] In response to the ultra-low standard requirement put forward by my country's environmental protection department for the concentration of NOx nitrogen oxides contained in the exhaust gas of coal-fired boilers to be less than 50mg / Nm3, the industry generally adopts technical transformation of existing boilers for the purpose of meeting low nitrogen emission standards. method to deal with it. At present, the method of spraying ammonia reducing agents such as urea solution and ammonia water into the tail flue of the boiler is more commonly used, so that it can be mixed with the flue gas to be exhausted, and part of the NOx nitrogen oxides in ...

AI Technical Summary

Problems solved by technology

However, how to realize it in practice still faces a series of problems that need to be studied and solved urgently, especially the spray gun for injecting reducing agent. The existing traditional spray gun with simple structure, single function, and poor wear resistance and heat resistance is obviously not competent. , not to mention that the low-nitrogen combustion technology in the furnace currently under study must be used in conjunction with a variety of reducing agents to achieve better results. Therefore, the applicability of the reducing agent spray gun has become a major problem in the industry.

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