SU1519757A1 - Method of regeneration of multisectional cloth filter - Google Patents

Abstract

The invention relates to methods for cleaning gas from dust and can be used in ferrous and non-ferrous metallurgy, the chemical industry and the building materials industry. Its use will improve the efficiency of regeneration and reduce the cost of gas purification. In the method of regeneration of a multi-section fabric filter, during injection, a pressure is created that exceeds the pressure in the interstitial space by 100-300 Pa, and additionally impulses of compressed gas are introduced into the group of hoses of the regenerated half of the section. 1 tab., 1 Il.

Description

The invention relates to methods for cleaning gas from dust and can be used in ferrous and non-ferrous metallurgy, the chemical industry, heat and power engineering, and the building materials industry.

The aim of the invention is to increase the efficiency of regeneration and reduce the cost of gas cleaning.

The drawing shows a multi-section fabric filter.

The filter includes a housing 1 with a nozzle 2 of dusty gas, a tube sheet 3 and groups A, U, B, and G of filter sleeves 4, which separate the filter into chamber 5 and chamber 6 of dusty and purified gas, respectively. The chamber of dusty gas is divided by a partition 7 into two parts 8 and 9, which have a common hopper 10. The purified gas chamber 6 is also divided by a partition 11 in half into two parts 12 and 13. The filter regenerating device includes a receiver 14 of compressed gas to which the impulse piping is connected. high-speed shut-off valves 15, 16,17,18,19,20, respectively. Pipelines 15, 16, 19, 20 are equipped with nozzles at the ends and are connected respectively to the groups of arms A, B, C and G. In the partition 11 there is an injection-mixing chamber 21, to which the impulse pipes 17 and 18 are connected. ends, and the output sections of these nozzles are located along

ate

coke

axis camera 21 and directed towards each other. The filter is equipped with a gas outlet 22, which is equipped with a shut-off valve 23.

The method is carried out as follows.

Pipeline 2 dust gas with a flow rate of 400,000 m / h and the dust containing in the chamber 12 is compensated in accordance with Darcy's law by filtering gas from chamber 8 into the hoses of groups A and B. Thus, a pulse is amplified into the arms of group B from the pipeline 17, filed in the chamber 13, and in the sleeves of group G - only to them

with the use of 3.0 g / m, they are fed into the chamber 5 of the housing-Q pulse from the pipeline 17, served

filter 1, and filtered through the fabric of the sleeves 4. The cleaned gas with a dust content of 50 mg / m is sent to chamber 6, from where it is removed from the filter through pipe 22. Upon reaching a certain maximum resistance, for example 1900 Pa, the filter is regenerated. At the same time, shut off valve 23 is closed, the supply of dusty gas to the filter is stopped and pressure in chambers 5 and 6 is equalized. After that, the valve of the impulse piping 15 is opened and a group of sleeves A from receiver 14 is supplied with a compressed gas impulse with a pressure of 6 x 10 Pa with duration 0, 1 s, injecting cleaned gas from chamber 12 into group A sleeves. Simultaneously with the valve of pipeline 15, open the valve of pipeline 18 and supply compressed gas to the mixing chamber, injecting gas from chamber 13 into chamber 12. The vacuum in chamber 13 caused by this momentum compensate t filtering gas from chamber 9 into the sleeves of group B and G. Thus, in the sleeves 1 of the bulkhead A, a pulse enters from conduit 15, amplified by an impulse from conduit 18, sent to chamber 12, and to the sleeves of group B - only an impulse from the pipeline 18 supplied to chamber 12. As a result, a pressure of 1400 Pa relative to the chamber 8 is created in the sleeves of group A, which removes the dust layer from the filter cloth and in the sleeves of group B, the pressure of 200 Pa is excessive to the chamber 8 , which eliminates the reprecipitation of dust on the sleeves of this group s from the sleeves of group A. After closing the valves on pipelines 15 and 18 simultaneously open the valves on pipelines G / and 19. Pipeline 19 compressed gas flows into the sleeves of group B, injecting purified gas from chamber 13 into them, and through pipe 17 compressed gas expires in mixing chamber 21, injecting purified gas from chamber 12. into chamber 13. At the same time vacuum, about 15

20

25

thirty

into chamber 13. Accordingly, the pressure drop in the arms of groups C and D is similar to the pressure drop relative to the chamber of hazardous gas in the arms of groups A and B. After closing the valve on pipelines 17 and 19, valves of pipelines 16 and 18 open. B from pipelines 16 a compressed gas impulse is received, enhanced by impulse from pipe 18 to chamber B supplied by B, and pulses supplied from pipe 18 to chamber 12, which eliminates redeposition of the dust removed from filter cloth on the arms of group A. sleeveless band B. Filtzia of the dusty gas, which compensates for the vacuum in chamber 13, occurs through sleeves B and G. The pressure drop created on the tissue of the arms of group K, when impulse from pipe 16 is fed into them, is less than the pressure on the fabric of arms of group A at feeds a pulse from conduit 15 into them by reducing the effect of the pulse 35 fed into chamber 12, due to

filtering gas through the cleaned arms of the vacuum chamber A into chamber 8. However, the efficiency of regeneration of the filter sleeves did not change, since this reduced the filtering gas’s resistance through the cleaned arms of group B from chamber 9. After closing the valves of the pipeline 16.18 by O, 1 open the valves of pipelines 12 and 20 and carry out the regeneration of the arms of group G. At the end of the regeneration of the section, open the shut-off valve 23 and the filtering mode of the dusty gas is resumed.

Examples of the method in other modes are presented in tables.

From the table you can see the following

40

45

50

)five

tea, when in the arms of group B an overpressure with respect to the gas chamber is less than 1000 n as a result of dust deposition on the arms of this group from the arms of group A (where pulses are fed directly from the pipeline 17,

into chamber 13. Accordingly, the pressure drop in the arms of groups C and D is similar to the pressure drop in relation to the chamber of hazardous gas in the arms of groups A and B. After closing the valves on pipelines 17 and 19, the valves of pipelines 16 and 18 are opened. pipelines 16 receives a pulse of compressed gas, amplified by a pulse from pipe 18, chamber B supplied to chamber 12, and group A sleeves are pumped impulse supplied from pipe line 18 to chamber 12, which eliminates the deposition of dust removed from filter fabric groups B. Filtration of the dusty gas, which compensates for the vacuum in chamber 13, occurs through sleeves B and G. The pressure drop created on the fabric of the sleeves of group K when the impulse from pipeline 16 is fed into them is less than what is on the fabric of the sleeves of group A when fed to impulse from conduit 15 by reducing the effect of the impulse fed into chamber 12 due to

filtering gas through purified hoses A into chamber 8. However, the efficiency of regeneration of filter sleeves did not change, since this decreased the resistance to gas filtered through cleaned arms of group B from chamber 9. After closing the valves of the pipeline 16.18 by 0, 1 the valves were opened pipelines 12 and 20 and carry out the regeneration of the arms of group G. At the end of the regeneration, the sections open the shut-off valve 23 and the filtering of the dusty gas is resumed.

Examples of the method in other modes are presented in the table.

From the table you can see the following

In tea, when in the arms of group B an overpressure relative to the gas chamber of less than 1000 Pa is created as a result of dust deposition on the arms of this group from the arms of group A (where the pulses are fed directly), the filter regeneration efficiency decreases. At the same time, an increase in this pressure drop above 3000 Pa does not lead to a further increase in the efficiency of regeneration, but only entails an increase in energy consumption.

The application of the invention will improve the efficiency of regeneration of filter fabric and reduce capital and operating costs.

gas cleaning.

Claims (1)

Formula of the invention e; n and A method for regenerating a multi-section fabric filter, comprising sectional regeneration with output of the regenerated section from the filtration mode and alternating injection of purified gas from one half of the section to the other through the supply of pulses of: compressed gas, characterized in that, in order to increase the efficiency of regeneration and reduce the cost of gas purification, during injection they create pressure on 100-300 Pa, which exceeds the pressure in the interstitial space, and additionally serves impulses of compressed gas inside the group of arms of the regenerated half of the section.