CN105709511A - Method and device for improving dust removal effect and explosion-proof performance of dust remover - Google Patents

Abstract

The invention discloses a device and method for improving dust removal effect and explosion-proof performance of a dust collector. The device includes a quantitative powder feeder (3), a timing control module (4), a delay control module (5), and a dust removal controller ( 7) and dust removal device (8), the entrance of the quantitative powder feeder passes through the side wall of the air inlet pipe (2) of the dust collector (1), and the quantitative powder feeder is connected with the timing control module; the timing control module is respectively connected with the dust collector The switch (6) is connected with the dust removal controller; the dust remover switch is connected with the fan (10); the delay control module is connected with the dust removal controller and the dust removal device (8) respectively. The method is to add inert powder to the air inlet (2) of the dust collector respectively when the dust collector is turned on and the dust is cleaned. The invention cooperates with the start-up and dust-cleaning actions of the dust collector, and optimizes the time for adding the inert powder. A small amount of inert powder greatly reduces the difficulty of dust falling off the filter material during dust removal, and reduces the explosiveness of the dust in the dust collector.

Description

A device and method for improving dust cleaning effect and explosion-proof performance of dust collector

technical field

The invention belongs to the technical field of dust collectors, and in particular relates to a device and a method capable of simultaneously improving the dust cleaning effect and explosion-proof performance of the dust collector.

Background technique

The filter dust collector is a dust removal device that intercepts the dust in the dusty gas through the interception of the filter material, so that the gas passing through the filter material can be purified. As the dust trapped by the filter material gradually increases, the filtration resistance increases, resulting in a decrease in air volume. Therefore, it is necessary to clean the filter material to realize the repeated reuse of the filter material. When cleaning dust, on the one hand, for the dust with high viscosity, it is difficult to fall off when it adheres to the filter material, causing the filter material to be clogged and the ability to purify dust is reduced; Cloud, this process has serious safety hazards for explosive dust.

At present, there are two main methods to improve the cleaning effect: one is to increase the cleaning intensity, such as increasing the injection pressure, increasing the injection diameter or prolonging the injection time, which increases the consumption of cleaning. energy; the other is to achieve by improving the flow field of the ash cleaning airflow, such as using induction nozzles, speed difference jet nozzles, or adding venturi tubes at the openings of filter cartridges or filter bags, and installing cones inside the filter cartridges etc., the above methods hardly change the gas consumption, the effect is still limited, and it is still difficult to achieve the desired effect for highly viscous dust.

The dust explosion suppression methods in the dust cleaning process mainly include gas inertization and spray drying. The former is to inject a large amount of inert gas into the dust collector to reduce the oxygen content in the dust cloud area before dust cleaning, so as to achieve the purpose of explosion suppression and explosion protection; the latter is to detect sparks and temperature at the moment of combustion or explosion through sensors. , pressure and other detection factors, and quickly start spraying water to suppress the explosion or extinguish the fire source. However, gas inertization needs to consume a large amount of inert gas, and generally cannot be used at the same time as dust filtration; spraying water is a passive explosion-proof method, and it largely depends on the detection performance of the sensor, the reliability of explosion-proof is not high, and spraying water will reduce The service life of the filter cartridge or filter bag.

The patent with the publication number CN202682974U discloses an inert powdered paint mist exhaust gas treatment device. The device continuously raises the inert powder to mix the inert powder with the paint mist and coat the paint mist, thereby reducing the viscosity of the paint mist to improve the dust removal effect. The device relies on the continuous mixing of inert powder and paint mist, and it is necessary to continuously add inert powder while purifying the paint mist. This process consumes a large amount of inert powder, and because the particle size of paint mist and inert powder is extremely small, the two are mixed and wrapped. It is extremely difficult and the effect of dust removal is not obvious.

Contents of the invention

The purpose of the present invention is to provide a device and method for improving dust removal effect and explosion-proof performance of dust collector. The device and method cooperate with the start-up and dust removal action of dust collector, and the time of adding inert powder is preferred, which can be greatly reduced by a small amount of inert powder. It is difficult for dust to fall off from the filter material during dust cleaning, which reduces the explosiveness of dust in the dust collector.

In order to achieve the above object, a device for improving dust removal effect and explosion-proof performance of a dust collector is characterized in that it includes a quantitative powder feeder, a timing control module, a delay control module, a dust removal controller and a dust removal device, and the quantitative The entrance of the powder feeder passes through the side wall of the air inlet pipe of the dust collector, and the quantitative powder feeder is connected to the timing control module; the timing control module is connected to the dust collector switch and the dust removal controller respectively; the dust collector switch It is connected with the fan; the delay control module is respectively connected with the dust removal controller and the dust removal device.

Further, the timing control module is used to adjust the time of continuous output signal; the delay control module is used to adjust the time of delayed output signal.

Preferably, the time for delaying the output signal by the delay control module is 1/3 to 2/3 of the time for the timing control module to continuously output the signal.

A method for improving dust cleaning effect and explosion-proof performance of a dust collector, comprising the following steps:

A) Turn on the switch of the dust collector to start the timing control module and the fan. Under the action of the negative pressure generated by the fan, the dusty gas begins to enter the dust collector from the air inlet pipe; at the same time, the timing control module controls the quantitative powder feeder The inert powder is input into the tube, and the inert powder is non-explosive dust. The inert powder enters the interior of the dust collector along with the dusty gas and is absorbed by the filter cartridge. is adsorbed on the surface of the inert powder layer;

B) The dust removal controller includes an automatic dust removal mode and a manual dust removal mode. When the dust purification ability of the filter cartridge decreases, the dust removal controller will start the automatic dust removal mode, and can also manually start the manual dust removal mode; After the ash controller is started, the signal is transmitted to the timing control module and the delay control module at the same time. After the timing control module is started, the quantitative powder feeder is controlled to input inert powder into the air inlet pipe; after the delay control module is started, the output signal is sent to the ash cleaning The device implements dust removal;

C) After dust removal, the timing control module continues to control the quantitative powder feeder to add inert powder to the air inlet until the timing ends, the quantitative powder feeder stops working, and the subsequent dust is then adsorbed on the surface of the inert powder layer;

D) When the dust purification ability of the filter cartridge drops again, repeat steps B) and C) until the dust collector stops;

The addition rate Q _m and the addition time t of the inert powder in the steps A), B) and C) are calculated according to the following formula respectively:

Q _m =c·Q

$\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&sigma;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; S</span>}}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}$

Among them, c is the concentration of inert powder, ρ is the density of inert powder, σ is the thickness of inert powder formed on the filter material, Q is the air suction volume of the dust collector, S is the total filtration area of the dust removal system; the value of c is 10-50g/m ³ , the value of σ is 0.01~0.05mm.

Preferably, the bonding strength of the inert powder is less than 500 Pa, and the particle size of the inert powder is larger than the filtration accuracy of the filter material.

Compared with the prior art, the present invention adds low-viscosity, non-explosive inert powder at the inlet of the air inlet when the dust collector is turned on, so that a layer of low-viscosity inert powder layer is formed on the filter material. When the gas passes through the filter cartridge, the dust is adsorbed on the surface of the inert powder layer, which facilitates the dust to fall off from the filter material during dust removal; adding inert powder before dust removal makes the inside of the dust collector permeated with inert powder, which is beneficial to inhibit the dust removal. The possibility of explosion of a large amount of suspended dust generated during ash removal; the inert powder that continues to be added after cleaning, on the one hand, suppresses the possibility of explosion of the still suspended dust, and on the other hand forms a layer of inert powder on the filter material again. layer, which is conducive to the shedding of dust during the next cleaning. The present invention cooperates with the start-up and dust-cleaning process of the dust collector, only needs to add inert powder when the dust remover is started and cleans dust, and does not need to add inert powder in the whole dust removal process, thereby reducing the amount of inert powder, saving costs, and improving the efficiency of the dust collector. Dust removal effect and explosion-proof performance double-layer effect, does not affect the normal operation of the dust collector, easy to operate, prolonging the service life of the filter cartridge or filter bag.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a working principle flowchart of the present invention;

In the drawings: 1. Dust collector, 2. Air inlet pipe, 3. Quantitative powder feeder, 4. Timing control module, 5. Delay control module, 6. Dust collector switch, 7. Ash cleaning controller, 8. Cleaning device, 9, filter cartridge, 10, blower fan.

detailed description

The present invention will be described in further detail below in conjunction with the accompanying drawings.

As shown in Figure 1, a device for improving the dust removal effect and explosion-proof performance of the dust collector includes a quantitative powder feeder 3, a timing control module 4, a delay control module 5, a dust removal controller 7 and a dust removal device 8. The entrance of the quantitative powder feeder 3 passes through the side wall of the air inlet pipe 2 of the dust collector 1, and the quantitative powder feeder 3 is connected with the timing control module 4; The controller 7 is connected; the dust collector switch 6 is connected to the fan 10; the delay control module 5 is connected to the dust removal controller 7 and the dust removal device 8 respectively.

The timing control module 4 is used to adjust the time of continuous output signal; the delay control module 5 is used to adjust the time of delayed output signal.

In order to achieve better dust removal effect and explosion-proof performance, and save the amount of inert powder, the time delay control module 5 delays the output signal is 1/3-2/3 of the time that the timing control module 4 continues to output the signal.

As shown in Figure 1 and Figure 2, a method to improve the dust removal effect and explosion-proof performance of the dust collector includes the following steps:

A) Turn on the dust collector switch 6 to start the timing control module 4 and the fan 10, and the dust-laden gas begins to enter the dust collector 1 from the air inlet pipe 2 under the negative pressure generated by the fan 10; at the same time, the timing control module 4 controls Quantitative powder feeder 3 feeds inert powder into the air inlet pipe 2. The inert powder is non-explosive dust. The inert powder enters the interior of the dust collector 1 with the dusty gas and is absorbed by the filter cartridge 9. After the inert powder layer is formed, the timing control module 4 timing End, the quantitative powder feeder 3 stops working, and the subsequent dust is adsorbed on the surface of the inert powder layer; the amount of the inert powder is large at the beginning, and the quantitative powder feeder 3 will stabilize the amount of the inert powder after a few seconds, so , although at the beginning there will be a small part of the dusty gas entering the dust collector 1 before the inert powder enters the dust collector 1, but this part of a small amount of dust can be ignored compared to a large amount of inert powder;

B) The dust removal controller 7 includes an automatic dust removal mode and a manual dust removal mode. When the dust purification ability of the filter cartridge 9 decreases, the dust removal controller 7 will start the automatic dust removal mode. When cleaning is required, it can also be artificially Start the manual dust removal mode; after the dust removal controller 7 is started, the signal is transmitted to the timing control module 4 and the delay control module 5 at the same time. After the delay control module 5 is activated, the output signal is sent to the dust removal device 8 to carry out dust removal; because the adhesion between the inert powder and the surface of the filter material is low, it is easy to fall off from the filter material by the effect of dust removal, and it is attached to the inert powder. The dust on the outer layer also falls off; at the same time, the inert powder has diffused in the space of the dust collector 1 through the timing control module 4 before the signal output of the delay control module 5, and the inert powder passes through the shield between the explosive dust generated during dust removal. The heat radiation, heat conduction and heat absorption of the system can be used to suppress the explosion of dust;

C) After dust removal, the timing control module 4 continues to control the quantitative powder feeder 3 to add inert powder to the air inlet 2 until the timing ends, the quantitative powder feeder 3 stops working, and the subsequent dust is then adsorbed on the surface of the inert powder layer. On the one hand, this will continue to suppress the possibility of the explosion of the dust that is still suspended, and on the other hand, a layer of inert powder will be formed on the filter material again, which is conducive to the falling off of the dust during the next dust cleaning; Dust cleaning action, adding low-viscosity, non-explosive inert powder to the air inlet pipe 2, while improving the dust removal effect and explosion-proof performance of the dust collector;

D) When the dust purification ability of the filter cartridge 9 drops again, repeat steps B) and C) until the dust collector 1 is shut down;

The addition rate Q _m and the addition time t of the inert powder in the steps A), B) and C) are calculated according to the following formula respectively:

Q _m =c·Q

$\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&sigma;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; S</span>}}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}$

Among them, c is the concentration of inert powder, ρ is the density of inert powder, σ is the thickness of inert powder formed on the filter material, Q is the air suction volume of the dust collector, S is the total filtration area of the dust removal system; the value of c is 10-50g/m ³ , the value of σ is 0.01~0.05mm.

In order to achieve a better cleaning effect, the cohesive strength of the inert powder is less than 500 Pa, and the particle size of the inert powder is greater than the filtration accuracy of the filter material.

Claims (5)

1. A device for improving dust removal effect and explosion-proof performance of a dust collector, characterized in that it comprises a quantitative powder feeder (3), a timing control module (4), a delay control module (5), a dust removal controller (7 ) and dust removal device (8), the entrance of the quantitative powder feeder (3) passes through the side wall of the air inlet pipe (2) of the dust collector (1), and the quantitative powder feeder (3) and timing control module (4) is connected; The timing control module (4) is connected with the dust collector switch (6) and the dust removal controller (7) respectively; The dust collector switch (6) is connected with the blower fan (10); the time delay The control module (5) is connected with the dust removal controller (7) and the dust removal device (8) respectively. 2. A kind of device that improves dedusting effect and explosion-proof performance of dust remover according to claim 1, is characterized in that, described timing control module (4) is used for adjusting the time of continuous output signal; Described delay control module (5) Used to adjust the delay output signal time. 3. A device for improving dust removal effect and explosion-proof performance of the dust collector according to claim 1 or 2, characterized in that, the delay control module (5) delays the output signal time for the timing control module (4) 1/3~2/3 of the time of continuous output signal. 4. A method for improving dust removal effect and explosion-proof performance of a dust collector, comprising the following steps: A) Turn on the switch (6) of the dust collector to start the timing control module (4) and the fan (10). Under the action of the negative pressure generated by the fan (10), the dusty gas begins to enter the dust collector from the air inlet pipe (2) (1); at the same time, the timing control module (4) controls the quantitative powder feeder (3) to input inert powder into the air inlet pipe (2), the inert powder is non-explosive dust, and the inert powder enters the dust collector with the dusty gas ( 1) The interior is absorbed by the filter cartridge (9) to form an inert powder layer, the timing control module (4) finishes timing, the quantitative powder feeder (3) stops working, and the subsequent dust is adsorbed on the surface of the inert powder layer; B) The dust removal controller (7) includes an automatic dust removal mode and a manual dust removal mode. When the dust purification ability of the filter cartridge (9) decreases, the dust removal controller (7) will start the automatic dust removal mode. Artificially start the manual dust removal mode; after the dust removal controller (7) is started, the signal is transmitted to the timing control module (4) and the delay control module (5) at the same time, and the timing control module (4) is activated to control the quantitative powder feeding The machine (3) inputs inert powder into the air inlet pipe (2); after the delay control module (5) is activated, the output signal is sent to the dust removal device (8) for dust removal; C) After cleaning, the timing control module (4) continues to control the quantitative powder feeder (3) to add inert powder to the air inlet (2) until the timing control module (4) finishes timing, and the quantitative powder feeder (3) stops working , the subsequent dust is then adsorbed on the surface of the inert powder layer; D) When the dust purification ability of the filter cartridge (9) drops again, repeat steps B) and C) until the dust collector (1) is shut down; The addition rate Q _m and the addition time t of the inert powder in the steps A), B) and C) are calculated according to the following formula respectively: Q _m =c·Q $\mathrm{<span\; class="notranslate">\; t</span>}<span\; class="notranslate">\; =</span>\frac{\mathrm{<span\; class="notranslate">\; \&rho;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; \&sigma;</span>}<span\; class="notranslate">\; \&Center\; Dot;</span>\mathrm{<span\; class="notranslate">\; S</span>}}{{\mathrm{<span\; class="notranslate">\; Q</span>}}_{\mathrm{<span\; class="notranslate">\; m</span>}}}$ Among them, c is the concentration of inert powder, ρ is the density of inert powder, σ is the thickness of inert powder formed on the filter material, Q is the air suction volume of the dust collector, S is the total filtration area of the dust removal system; the value of c is 10-50g/m ³ , the value of σ is 0.01~0.05mm. 5. a kind of method for improving dedusting effect and explosion-proof performance of dust collector according to claim 4, is characterized in that, the cohesive strength of described inert powder is less than 500Pa, and the particle diameter of described inert powder is greater than the filtration of filter material precision.