A hood type demister

Abstract

The invention discloses a wind-cap type demister. The wind-cap type demister comprises an inner draft tube and an outer draft tube which covers the inner draft tube, wherein the bottom and the top of the inner draft tube are open; the wall of the inner draft tube is provided with a plurality of flow guide holes; the top of the outer draft tube is closed; the bottom of the outer draft tube is connected with the inner draft tube; the inner wall of the outer draft tube is provided with a spiral diversion trench. The wind-cap type demister is a deep dust removal and demisting device and has good dust removal and demisting effects, the outlet dust content can be below 5mg / Nm<3>, and the running resistance is less than or equal to 200Pa. The conventional demister plus wet electric precipitation process can be replaced, and a novel reliable and cheap process equipment option is provided for dust removal and demisting of saturated flue gas.

Description

technical field [0001] The invention belongs to the technical field of flue gas purification and relates to a wind cap type demister. Background technique [0002] At present, more than 95% of the flue gas of the existing large-scale coal-fired boilers in China adopts the wet desulfurization process. Contains some corrosive chemical substances, which also cause pollution and serious corrosion of the induced draft fan and flue. Therefore, the wet desulfurization process requires demisting of the absorption equipment. The purified gas must be demisted before leaving the absorption tower. . [0003] The low-temperature saturated clean flue gas discharged from large coal-fired boilers contains gypsum slurry and dust, and the configuration of GGH is very small, resulting in serious "gypsum rain" phenomenon and large dust pollution emissions. The main reason for this problem is that the existing demisters can only remove larger droplets with a particle size greater than 15um, so...

AI Technical Summary

Problems solved by technology

In addition, the "fog eliminator + wet electrostatic precipitator" process uses a high-voltage electric field to capture fog droplets and dust particles. There are many high-voltage electrical equipment in the equipment, and the electrode wires are made of high-grade alloy materials. The construction cost is high and the power consumption for operation is high. It is also one of the reasons that limit its application

[0008] The main reason why it is difficult to upgrade the process route of "mist eliminator + wet electrostatic precipitator" on the desulfurization tower of the built project is that the weight and volume of the equipment are huge, and the structural design strength of the original absorption tower cannot meet the load requirements of the electrostatic precipitator. ; The demand for site area also limits the possibility of its external layout when adjacently arranged, coupled with the huge increase in running resistance when adjacently arranged, resulting in a further increase in the operating cost of the "mist eliminator + wet electrostatic precipitator" process route

[0009] Due to a large number of high-voltage electrical equipment, the operation and maintenance of the "mist eliminator + wet electrostatic precipitator" process route is complicated, the technical requirements for operation are high, and the operation and maintenance costs are relatively high

Images