A process for tower boiler recirculation flue gas atomization desulfurization wastewater

Abstract

The invention relates to a process for atomizing desulfurization waste water through recycled flue gas of a tower type boiler. The process comprises the steps that the desulfurization waste water of a desulfurization tower is drained to a stilling basin for preliminary sedimentation, and then the desulfurization waste water is pressurized through a pump and conveyed to a pipeline of a nozzle; part of the desulfurized flue gas is sent to the pipeline of the nozzle through a recirculation fan, so that the recirculation flue gas is in contact with the desulfurization waste water in the pipeline of the nozzle, and the initial temperature of the desulfurization waste water is raised; the nozzle is installed in a vertical flue located at the tail of the boiler, the desulfurization waste water is jetted and atomized, atomization liquid drops into the flue and evaporates quickly, and all ions in the desulfurization waste water are separated by crystallization quickly, captured by a dust remover when entering the dust remover along with the flue gas and discharged outward along with dust. By means of the design of the process, atomization performance of the desulfurization waste water is improved, evaporation of the desulfurization waste water is accelerated, blocking of a jet system can be prevented, the desulfurization waste water is effectively prevented from being jet to the pipe wall, the problem of corrosion of the wall surface of a flue which is caused easily when ordinary flues are used for treating desulfurization waste water is avoided, innocent treatment of the desulfurization waste water in the real sense is achieved, reconstruction investment is small, and operation cost is low.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a process for atomizing desulfurization wastewater by recirculating flue gas of a tower boiler. Background technique [0002] At present, flue gas desulfurization is considered to control SO 2 The most efficient way to reduce emissions. Limestone-gypsum wet flue gas desulfurization is the most widely used and most mature desulfurization process in the world. It is applicable to a wide range of coal types, a wide range of sulfur content in coal types, high desulfurization efficiency (≥90%), and high system availability ( ≥95%), high utilization rate of absorbent (≥90%), but this process will produce 5 ~ 20m 3 / h of desulfurization wastewater. During the operation of flue gas wet desulfurization unit, because SO 2 The absorption liquid is recycled, so the concentration of salt and suspended impurities in the absorption slurry will become higher and higher. ...

AI Technical Summary

Problems solved by technology

[0004] 2) High content of suspended solids

[0005] 3) High hardness leads to easy scaling

[0006] 4) Strong corrosion

However, the pipeline space before the dust collector is small, and the sprayed desulfurization wastewater will splash onto the pipe wall, causing corrosion and fouling of the pipe wall; the temperature of the flue gas before the dust collector is low, and the evaporation speed of the desulfurization wastewater is slow; It is required to control the flue gas temperature higher than the acid dew point temperature, otherwise it will cause corrosion to the electrode plate of the dust collector

Images