RU2437710C2 - Bag filter with impulse recovery for dusty gas cleaning - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to dusty gas cleaning and may be used in chemical and food industries, metallurgy, as well as in production of construction materials. Proposed bag filter comprises cylindrical case with screen to divide said case into dusty and clean gas chambers, filter sleeves stopped from below, regenerator, tapered dust collector with gate, blowing tubes with electromagnetic valve and receiver, as weal and dusty gas feed and clean gas discharge branch pipes. Filter sleeves are pulled on metal frame made up of a coil fitted on said screen, sleeve top parts are secured to said frame by clamp and arranged coaxially in metal or polymer shells with open bottom. Truncated-cone ejecting nozzles are arranged in top part of said shells. Distance from filter sleeve to said shell is selected so that to allow gas flow rate of 25-75 m/s.

EFFECT: higher efficiency of cleaning and regeneration.

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Description

The invention relates to techniques for cleaning dusty gases and can be used in the chemical, food and metallurgical industries, as well as in the building materials industry.

The closest in technical essence and the achieved effect is a filter with pulsed regeneration, comprising a housing with a grill separating it into dusty and purified gas chambers, filter bags, frames with ejecting nozzles, a regenerating device, a dust collecting bin [Uzhov V.N., Myagkov B .AND. Purification of industrial gases by filters. - M .: Chemistry, 1970. P.198].

The disadvantage of the prototype is the insufficiently high cleaning efficiency and unreliability of the regeneration system, which leads to a high cost of the cleaning process.

Regeneration when the gas load is off is associated with high hardware costs. Therefore, based on the short duration of the regenerating pulse, the cleaning of the filter surface is carried out at a constant gas load. At the same time, it is very difficult to transport dust to the dust bin, which is especially important for fine and dry dust (for example, when cleaning high-temperature gases).

Dust removed as a result of regeneration from the surface is not deposited in the hopper, but is captured by the incoming dust and gas stream and again transported to the filter surface, as a result of which the time of the regeneration period decreases, and the hydraulic resistance of the filter rises very quickly to a critical level.

An object of the invention is to increase the efficiency of cleaning dusty gases and the process of regeneration of the bag filter, the intensification of the cleaning process of dusty gases, increasing the performance of the filter.

The technical problem of the invention is achieved in that in a bag filter with pulsed regeneration for cleaning dusty gases, containing a cylindrical body with a grill separating it into chambers of dusty and purified gases, filter bags, muffled from below, a regenerating device, a conical dust collector with a shutter, purging pipes with electronic valve and receiver, as well as nozzles for supplying dusty and purified gas outlet, the new is that the filter bags are tensioned on a metal frame, made In the form of a spiral fixed to the grate, the filter bags with the upper part are fixed on the frame with a clamp and installed coaxially in metal or polymer shells with an open bottom, in the upper part of which there are ejected nozzles in the form of truncated cones, a regenerating pulse is fed into the space between the filter sleeve and the shell, and the distance from the filter sleeve to the shell is selected in such a way as to ensure the movement of the gas stream at a speed of 25-75 m / s.

The technical result of the invention is to increase the efficiency of purification of dusty gas, the process of regeneration of the bag filter, to intensify the filtering process and to increase the performance of the bag filter with pulse regeneration for purification of dusty gas.

The drawing shows a bag filter with pulse regeneration for cleaning dusty gases.

A bag filter with pulsed regeneration for cleaning dusty gases consists of a housing 1, a grill 2 dividing the housing into chambers of dusty and purified gases, filter bags 3 made of filter material, closed from the bottom, mounted on the grill and consist of metal frames 5 stretched over of them with filter material 4, a regenerating device includes purge pipes 7 with nozzles 6, solenoid valves 8 and receiver 9, nozzles 10 for entering dusty and 11 for leaving purified gases, dust collecting bin 1 2, shutter 13, hatches 14 and 15. The filter bags 3 are installed coaxially in the shell 16, made in the form of metal or polymer cylinders with an open bottom, in the upper part of which there are ejecting nozzles 17 in the form of truncated cones, the distance from the filter sleeve to the shell selected from the condition:

where Q _p is the flow rate of compressed air, m ³ / s; d _o - shell diameter, mm; d _p is the diameter of the sleeve, mm

Bag filter with pulse regeneration for cleaning dusty gases works as follows.

Dusty gases through the pipe 10 enter the chamber of dusty gases. When the dust and gas stream passes through the filter material 4, separation occurs: the gases enter the chamber of the purified gases and then are discharged through the pipe 11 into the atmosphere, and the dust is deposited on the surface of the filter material. As dust is deposited, the filter resistance increases, so after a certain time, the sleeves are automatically regenerated.

During regeneration, the electromagnetic valve 8 is activated and opens the access of compressed air from the receiver 9 to the purge pipe 7. The regeneration process consists in the fact that the jet of pressure air, knocking out of the nozzle 6, ejects the gas in the chamber into the space formed by the filter sleeve 3 and the sheath 16 .

The process of removing a dust layer from the inner surface of the sleeve will have an avalanche-like character, and a rarefaction effect similar to that created by a piston moving in a cylinder occurs. As a result of this process of dust movement in the sleeve, it deforms (collapses) and gas is sucked through the filter material from the purified gas chamber. The dust layer is deformed, the flow of purge air is separated from the filter material and discharged into the dust bin, where it is removed.

The proposed bag filter with pulse regeneration for cleaning dusty gases allows you to:

- increase the efficiency of the process of cleaning dusty gases;

- reduce operating costs due to increased time of the inter-regeneration period;

- increase the efficiency of the regeneration process;

- increase the service life of the filter bags due to a more complete removal of the dust layer from the surface of the bag during the regeneration process;

- ease of manufacture and reliability;

- increase the reliability of the filter regeneration system;

- intensify the process of cleaning dusty gases;

- increase the performance of the bag filter.

Claims (1)

Bag filter with pulsed regeneration for cleaning dusty gases, containing a cylindrical housing with a grill separating it into chambers of dusty and purified gases, filter bags, muffled from below, a regenerating device, a conical dust collector with a shutter, purge pipes with an electromagnetic valve and receiver, as well as nozzles supplying dusty and withdrawing purified gas, characterized in that the filter bags are tensioned on a metal frame made in the form of a spiral mounted on a grate, a filter The upper arms are fixed on the frame with a clamp and mounted coaxially in metal or polymer shells with an open bottom, in the upper part of which there are ejected nozzles in the form of truncated cones, a regenerating pulse is fed into the space between the filter sleeve and the shell, the distance from the filter sleeve to the shell It is selected in such a way as to ensure the movement of the gas stream at a speed of 25-75 m / s.

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