Applicable working conditions of pre-sprayed filter bag

1、The dusty gas contains liquid viscous substances such as oil fume. This sticky substance will not corrode the filter bag. Due to the high adhesion, it mixes with the dust in the gas to form a mud-like substance, which blocks the pores of the filter bag , causing the filter bag to increase the running resistance and fail the dust removal. It is so serious that it can even cause the dust collector to malfunction. At this time, pre-spraying is required for the filter bag.

2、Because the combustion material contains sulfur and the flue gas contains sulfide, in many combustion conditions, sulfide will be formed in the generated flue gas. In order to desulfurize, it is necessary to spray slaked lime powder and reaction auxiliary agent into the gas. With the assistance of lime powder and reaction additives, the gaseous sulfide generates solid calcium sulfate, which can then be captured by the filter bag along with the dust particles to achieve the purpose of desulfurization. The amount of hydrated lime powder and additives can be determined according to the sulfide content in the flue gas. This process should be equipped with an active sulfide content measurement device to prevent incorrect dosage.

3、The alumina powder from the aluminum electrolysis plant is used as a filter aid to purify the fluoride in the gas. The aluminum electrolysis process will emit a lot of fluorine-containing gas. The alumina powder is used to adsorb the rich gaseous fluorine and solid fluoride generated in the aluminum electrolytic cell, and then filtered with a bag filter. The flue gas and alumina are mixed violently in the turbulent flow. The hydrogen fluoride in the flue gas and the alumina between them undergo an external adsorption reaction to form an external compound of aluminum fluoride. This is a rapid and violent reaction, which can be achieved within one second. The flue gas after the reaction is stripped of the fluoride-containing alumina from the filter bag of the bag filter, which can be directly used for electrolysis production and can replace some fluoride salt materials.