Dry-wet mixed type electrostatic precipitator and working method thereof

Abstract

The invention provides a dry-wet mixed type electrostatic precipitator and a working method thereof, and belongs to the field of dust collection. The dry-wet mixed type electrostatic precipitator structurally comprises a shell. The two ends of the shell are provided with a smoke inlet and a smoke outlet respectively. One end, close to the smoke inlet, in the shell is provided with dry type dust collection electric fields. One end, close to the smoke outlet, in the shell is provided with a wet type dust collection electric field. A conversion region for cooling and humidifying smoke is arranged between the dry type dust collection electric fields and the wet type dust collection electric field. The character of smoke coming from the dry type dust collection electric fields is changed and the section of the electric fields is adjusted through the conversion region so as to meet the working requirement of the wet type dust collection electric field. The conversion region is additionally arranged between the dry type dust collection electric fields and the wet type dust collection electric field, the smoke coming from the dry type dust collection electric fields is cooled and humidified and the size of the section of the electric fields is adjusted so that the dry type dust collection electric fields and the wet type dust collection electric field can be combined in the same shell successfully.

Description

technical field [0001] The invention relates to the field of dust removal, in particular to a dry-wet hybrid electric dust collector and a working method thereof. Background technique [0002] The dry-wet hybrid electrostatic precipitator is one of the most efficient dust collectors so far. It combines the advantages of both the dry electrostatic precipitator and the wet electrostatic precipitator, and makes up for the shortcomings of the two. The dry-wet hybrid electrostatic precipitator has the outstanding advantages of small footprint and high purification efficiency. It also has a good removal effect on heavy metals and PM10, especially PM2.5. Smoke emission can reach 5mg / Nm 3 Below, achieve ultra-low emissions. However, the basic conditions for the operation of the dry electrostatic precipitator and the wet electrostatic precipitator are different, and even contradictory. Therefore, if the dry electrostatic precipitator and the wet electrostatic precipitator are combi...

AI Technical Summary

Problems solved by technology

[0006] 1. The front dry electrostatic precipitator uses the dry method to clean the dust, which requires the dust to be in a dry and loose state. If the flue gas of the rear wet electrostatic precipitator enters the front-stage electric field (due to fluctuating flue gas pressure, the probability is extremely high), the dust will Moisture becomes sticky, and the effect of vibrating to remove dust becomes poor. Over time, the dust will harden on the electrode and cause the electric field to fail

[0007] 2. The dust from the dry dust removal electric field directly enters the wet dust removal electric field. Even if multiple nozzles and large sprays are used in the wet dust removal electric field, it is impossible to instantly cool and moisten the flue gas to a state close to saturation, and the dust cannot be fully wetted. The dust collected on the electrode is only in a wet state. According to the current general design of spray cleaning, the dust cleaning will not be complete, the dust will alternate between wet and dry, and the electrode plate is prone to fouling, which is irreversible, and the electric field will soon become invalid.

[0009] The dry-wet hybrid electrostatic precipitator has outstanding strengths and advantages. Under the current situation of "ultra-clean emission", it will be the best choice. However, the above-mentioned technical problems have yet to be solved, making it impossible to put into use

A similar concept was proposed abroad in the last century. Someone transformed the final electric field into a wet dust removal electric field. As a result, it was found in practice that there were many problems in the operation of the wet dust removal electric field, so that the research and practice of the dry-wet hybrid electrostatic precipitator paused for a while

So far, although foreign countries have great interest in the research and development of dry-wet hybrid electrostatic precipitators, there are no successful case reports of commercial application. It can be seen that there are still some technical difficulties that need to be overcome

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