SU1152624A1 - Method and apparatus for cleaning gases in bag filter - Google Patents

Description

2. Gas purification device, on bag filters, including a body with filter sleeves, clean, dirty and compressed purge gas pipelines, quick-acting valves and diffusers, characterized in that, in order to increase the efficiency, the invention relates to cleaning gases from dust and applied in ferrous and nonferrous metallurgy, chemical industry and industrial construction materials.

The purpose of the invention is to increase the regeneration efficiency.

According to the invention, during the delivery of compressed gas impulses to the inside of the hoses in the filtered flow, oscillatory perturbations are created. The frequency and phase of oscillatory perturbations is equal to the frequency and phase of natural oscillations of the pressure differential that occur during pulse regeneration on the filter fabric of the sleeves, for which the pneumatic pulsator, the clean gas is installed on the pipeline, and the high-speed valves of the compressed purge gas are connected in parallel to each other through the executive relay to the pulse regenerator. .

The essence of the invention is as follows.

During pulsed regeneration of fabric filters inside the filtering element, low-frequency oscillations (with a frequency of about 510 Hz) pressure pressure occur on its porous partition. The greater the amplitude of these oscillations, the more efficient the regeneration proceeds. If during the delivery of a pulse of compressed purge gas (air) in a hose to the filtered gas flow (since during the regeneration the filter is not disconnected) oscillatory perturbations are applied with a frequency and phase equal to the frequency and phase of the natural oscillations of the regeneration differential pressure, the device is equipped with a pulse regenerator and pneumatic pulsator with high-speed valves that are connected through an actuating relay to the pulse regeneration unit, while the pneumatic pulsator is installed on the clean gas pipeline.

results from pulsed regeneration on the filter fabric, a resonance occurs, which significantly increases the amplitude of the oscillation pressure drop of the gas, and hence the regeneration efficiency. The phase and frequency of natural oscillations of the pressure drop across the filter septum can be

pre-determined from the experiment on the model or by calculation.

The drawing shows the proposed regeneration device.

sleeves.

The device consists of a housing 1 with gas pipelines 2 and 3, respectively, dusty and purified gases, a tube sheet 4 with sleeves 5,

a dust bin 6 and a device for pulsed regeneration. The device for pulse regeneration includes compressed gas (air) pipelines 7 with a purge

nozzles 8 and high-speed valves 9, diffusers 10 and unit pulse regeneration (ZIR) 11, which through the executive relay (IR) 12 in parallel

connected high-speed valves 9 and pneumatic pulsator (PP) 13 installed on the gas pipeline clean gas 3.

The filter works as follows.

Dusty gas through the pipeline 2

enters the housing 1. Filters are filtered through a cloth 4 filter sleeves 5 fixed in a tube sheet and removed from the filter through a clean gas pipeline 3. The dust is removed from the filter cloth of sleeves 5 by simultaneously supplying pulses of compressed gas (air) through nozzles 8, directed inside the sleeves towards each other. Upon reaching the maximum permissible hydraulic resistance from the pulse regeneration setting device 11, the executive relay 12 receives a signal to open the high-speed valves 9, compressed gas (air) flows through pipelines 7 from nozzles 8 to sleeves 5 and, passing through diffusers 10, injects purified gas from gas purge gas 3 into the sleeve 5. The incoming stream of compressed gas (air) and the purified gas creates an increased pressure in the sleeves, causing the filter sleeve to swell, deforming the filling layer, and one Temporarily purged reflux stream. Low-frequency fluctuations in pressure drop occur on the filter fabric of the sleeves 5, destroying the dust layer. Simultaneously with the signal to open the high-speed valves 9, the ZIR-IR receives a signal to turn on the pneumatic pulsator 13, which creates low-frequency oscillations for the flow of the filtered gas, coinciding in frequency and phase with oscillation. no pressure drop across the filter fabric of the sleeves. This leads to a significant increase in the amplitude of natural oscillations of the pressure drop 244 on the fabric of the sleeves and, as a result,. - to increase the efficiency of regeneration of filter sleeves, Example. When implementing the proposed method on a filter with a capacity of 10,000 m / h of dust-laden gas, 2 m / h of air with a pressure of 6 was spent on pulse regeneration. A pneumatic pulsator PP-17 was connected to the filter of the clean gas pipeline, which, in parallel with the high-speed purge gas valves, was connected to the pulse regeneration unit via the executive relay. According to a preliminary calculation, the PP-17 pneumatic pulsator was tuned to a frequency of 7 Hz and, when the filter was regenerated, oscillations were excited in the filtered gas flow, which in frequency and phase coincided with the natural oscillations of the pressure drop across the filter fabric of the sleeves. At the same time, the regeneration efficiency increased, which made it possible to increase the filtration rate. The use of the proposed invention allows to intensify the regeneration process without significant costs, which leads to an increase in throughput compared to the prototype and bai object.

Claims (2)

1. The method of purification of gases on bag filters by passing gas through filter bags with subsequent regeneration of the latter by blowing with compressed air, supplied by short-term pulses from both sides of the bags towards each other, characterized in that, in order to increase the efficiency of regeneration, during the regeneration period during the supply of compressed air pulses into the arms in a gas stream creates oscillatory disturbances, the frequency and phase of which coincide with the frequency and phase of the natural oscillations of the pressure drop i arising from pulsed regeneration on filter bags. .SU. ,,. 1152624 2. A device for gas purification on bag filters, including a housing with filter bags, pipelines for clean, dirty and compressed purge gases, high-speed valves and diffusers, characterized in that, in order to increase the efficiency of regeneration, the device is equipped with a pulse regeneration regulator and an air pulsator with quick valves that through I actuating relay is connected to the pulse regeneration master, while the air pulsator is installed on the clean gas pipeline.