Long bag pulse spraying dust collector capable of preventing bag explosion

Abstract

The invention discloses a long bag pulse spraying dust collector capable of preventing bag explosion, belonging to the technical field of dust collecting devices. The invention aims to provide a long bag pulse spraying dust collector with low resistance, high efficiency and good performance of sealing, heat-insulating, flame prevention and explosion prevention, which can clean dust under low pressure pulse spraying condition. Based on the traditional long bag pulse spraying dust collector, a side wall plate close to a bag chamber (6) in an air inlet passage (24) is set as a grid plate (26), i.e. rectangular grid holes (27) staggered in a horizontal-longitudinal direction area are arranged on the side wall plate at the lower part of a flow guide plate (25), the longitudinal central line ofthe rectangular grid hole corresponds to the central line between two rows of filtering bags. At the same time, a pressure relieving explosion-proof device (11) with a double-layer structure and a low pressure submerging pulse valve (15) are adopted. The invention can be widely used for collecting dust contained in dust gas with high concentration and explosive performance generated by industrialcoal powder preparing systems such as metallurgy, electric power, building materials and the like, thereby realizing the aim of low resistance, high efficiency and anti-explosion.

Description

Background technique [0001] The invention relates to a long-bag pulse spray explosion-proof bag dust collector, which belongs to the technical field of dust collectors. Background technique [0002] At present, the bag dust collectors used for dust control in the pulverized coal preparation system mainly include back-blowing explosion-proof bag dust collectors, gas box pulse explosion-proof bag dust collectors and high-pressure pulse spray explosion-proof bag dust collectors. Due to the tightening of emission concentration limits by the new emission standards and the optimization and improvement of the coal powder preparation process, the blowback type explosion-proof bag dust collector has been phased out, and the new production lines and renovation projects all use air box pulse explosion-proof bag dust collectors or High-pressure pulse spray explosion-proof bag dust collector. The gas box pulse explosion-proof bag dust collector is a high-voltage compartment off-line du...

AI Technical Summary

Problems solved by technology

[0003] Both of the above two dust collectors have the following defects: ①The selected filter bag is a short bag, the length of which is generally below 3250mm, mostly between 2450mm and 3050mm, which does not give full play to the advantages of pulse jet cleaning, and makes the equipment occupy a large area. larger area

②The inclined deflector is used as the uniform air pre-dust collection device. All the dusty gas enters from the air inlet, first passes through the deflector and the flue, and then passes through the bottom of the bag room for air distribution, and then enters the net after being filtered by the filter bag. Air chamber, this will cause the gas in the bag chamber of the dust collector to rise too fast, and the resistance of the dust collector will increase. In addition, the use of a right-angle pulse valve will also increase the pressure loss. The resistance of high-concentration exhaust gas is between 1470Pa and 2000Pa, and the resistance of high-pressure pulse jet explosion-proof bag dust collector is generally between 1300Pa and 1800Pa when dealing with high-concentration exhaust gas.

In addition, because the dust-laden gas passes through the bottom of the filter bag, the bottom of the bag will be worn, and the uneven distribution of the air flow will also cause uneven wear of the filter bag, which will affect the service life of the filter bag.

③The pressure relief and explosion-proof devices equipped with both types of equipment are single-layer pressure relief structures, which are difficult to control the explosion pressure, poor sealing performance, high air leakage rate, and the sealing strip is easy to be cut by the door edge. Problems such as returning to the original position in time, poor insulation effect, etc.

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