Filter tube for high-temperature gas-solid separation and filter with same

Abstract

The invention relates to a filter tube for gas-solid separation. The filter tube is composed of a first cylinder and a second cylinder coaxially sleeved in the first cylinder, wherein the first cylinder is arranged to be open upward, and is provided with a first connecting flange at the cylinder opening outer rim; a round through hole is formed at the center of the bottom of the first cylinder; the second cylinder is open downward and reversely sleeved in the first cylinder; the opening end of the second cylinder is correspondingly in sealed connection with the round through hole of the first cylinder; the bottom of the second cylinder is at the same level height as the cylinder opening of the first cylinder; and an annular gas passage is formed between the first cylinder and the second cylinder. by adopting the filter tube and the filter thereof, the filtration area of the single filter tube and that of the whole filter can be increased, the dedusting effect is improved, and the production cost and the maintenance cost of the whole filter device are reduced; and at the same time, the ash removing efficiency can be effectively increased, and the problems of backflow and negative pressure zone are also solved; and the technical scheme is beneficial to prolonging the service life of the filter tube.

Description

technical field [0001] The invention relates to a gas-solid separation element and device, in particular to a sintered metal filter tube and a filter device thereof. Background technique [0002] In chemical industry, petroleum, metallurgy, electric power and other industries, high-temperature dust-containing gases are often produced; because different processes need to recover energy and meet environmental protection emission standards, these high-temperature dust-containing gases need to be dedusted. High-temperature gas dedusting is a technology that directly separates gas from solid under high-temperature conditions to achieve gas purification. It can maximize the use of physical sensible heat, chemical latent heat and kinetic energy of the gas to improve energy utilization, while simplifying the process and saving equipment investment. [0003] The equipment often used in high-temperature gas-solid separation is a gas filter. The filter tube is the core component of th...

AI Technical Summary

Problems solved by technology

There are generally hundreds to thousands of filter tubes installed in large gas filters. The larger the process gas volume to be processed, the more filter tubes are required, the larger the filter volume, and the higher the production and maintenance costs of the entire device.

[0010] (2) The pulse blowback process causes serious "reflux"

[0011] Studies have shown that when the pulse blowback is close to the end, the blowback gas velocity gradually decreases. During this process, the pressure inside the filter tube is lower than the pressure outside the filter tube, and the gas near the outer wall of the filter tube will pass through the tube wall from the outside of the tube. The backflow phenomenon flowing to the inside of the tube makes the solid particles that have been blown off from the outer wall of the filter tube settle on the outer wall again. This "backflow" phenomenon even makes some small particles embedded in the tube wall, which is easy to block the filter. Porous channels of the tube, reducing the service life of the filter tube

[0012] (3) The outer surface of the support body is the filter surface. During the filtration process, the fine particles in the dusty gas are easily deposited inside the support body. Since the porous channels in the filter tube are in the form of an irregular labyrinth, the backflushing operation is also difficult. It is difficult to blow out the deposited dust, causing the pores of the filter tube to block and fail

[0013] (4) Studies have shown that when the filter tube is cleaned by pulse back blowing, since the top opening end of the filter tube and the back blowing air flow form an ejection structure, the high-pressure and high-speed back blowing air flow will be drawn from around the opening end of the filter tube. The clean gas injected into the inside of the filter tube will easily form a "negative pressure zone" near the opening end. The existence of the negative pressure zone makes the dust outside the filter tube be entrained to the surface of the filter tube in this area. This area is equivalent to a clean area. The gray blind area can not achieve the effect of dust removal

Images