Bag pretreatment device for bag-type dust collector

Abstract

The utility model provides a cloth bag pretreatment device for a cloth bag dust remover, which comprises an ash spraying chamber, a tubesheet is arranged at the top in the ash spraying chamber, a tubesheet hole is arranged in the middle of the tubesheet and is used for mounting a filter bag, a circle of blowing ring pipe is arranged below the tubesheet, the diameter of the blowing ring pipe is larger than that of the filter bag, the blowing ring pipe is provided with a plurality of spray heads, and the spray heads are aligned to the filter bag. The center of the blowing ring pipe coincides with the center line of the pattern plate hole, the blowing ring pipe is fixedly connected with the ash spraying chamber, the blowing ring pipe is provided with an ash inlet pipe, the ash inlet pipe outwards penetrates out of the ash spraying chamber and is connected to the ash supply mechanism, and the ash supply mechanism is used for conveying a moisture absorption agent into the blowing ring pipe; a transparent observation window is arranged on the side wall of the ash spraying chamber, a smoke collecting pipe is arranged on one side, opposite to the ash supply mechanism, of the upper end of the ash spraying chamber, and a valve is arranged on the smoke collecting pipe; the device is easy and convenient to operate and good in ash coating effect, and the problem of bag pasting is solved; and the utilization rate of the moisture absorption agent is improved.

Description

Technical Field

[0001] The utility model relates to the field of copper metallurgical fume treatment, in particular to a bag pretreatment device for a bag dust collector. Background Art

[0002] The production flue gas of the copper metallurgical furnace is purified and dusted by a bag filter. The inlet smoke pipe of the bag filter is connected to the metallurgical furnace, and the outlet smoke pipe is connected to the exhaust fan. A flower plate is provided on the top of the bag filter, and the flower plate has flower plate holes. The filter bag passes through the flower plate holes from top to bottom and is fixed on the flower plate with a filter bag cage. After the exhaust fan is started, the production flue gas of the metallurgical furnace enters the bag filter through the inlet smoke pipe, enters the filter bag from the outside, and the dust in the flue gas is captured on the surface of the filter bag. The purified flue gas flows out from the top of the filter bag and gathers into the outlet smoke pipe of the bag filter to be sent to the next process.

[0003] In the early stage of copper metallurgical furnace operation, the flue gas temperature entering the bag filter is often lower than its dew point temperature. The moisture in the flue gas condenses on the surface of the bag and combines with the smoke to form a sticky substance that cannot be removed by backblowing, causing the bag to lose its air permeability and the bag filter to fail to work properly. This is called bag sticking. To solve the bag sticking problem, an ash filling port is opened on the inlet smoke pipe. Before the furnace is turned on, desiccant such as lime and diatomaceous earth is added to the ash filling port, and then the exhaust fan is started so that the desiccant is sucked into the bag filter along with the air. The desiccant is blocked by the filter bag and retained on the surface of the filter bag, eventually forming a protective layer. This operation is called filter bag pre-coating.

[0004] After the metallurgical furnace is turned on, the moisture contained in the initial flue gas condenses and is absorbed by the desiccant on the surface of the filter bag, thereby preventing the filter bag from becoming sticky. With the current conventional pre-ashing method, the thickness of the protective layer on the filter bag surface cannot be uniform. The surface of the filter bag facing the flue gas inlet has a better ash coating effect, while the effect on the back is poor. The surface of the filter bag around the flue gas inlet has a better ash coating effect. The farther away from the flue gas inlet, the worse the effect, and some filter bags are not even coated with ash at all. For small bag dust collectors with a small number of longitudinal chambers, the problem of uneven ash coating on the filter bag surface can be compensated to a certain extent by increasing the amount of desiccant used. The side effects are large waste of desiccant and excessive resistance of some filter bags. However, for large bag dust collectors with more longitudinal chambers, the problem of uneven ash coating on the filter bag surface is more prominent. Even if the amount of desiccant used is increased, the pre-ashing effect is still not ideal, and the bag becomes sticky. Utility Model Content

[0005] In order to solve the above technical problems, the utility model provides a bag pretreatment device for a bag dust collector.

[0006] The specific scheme of the utility model is as follows: a bag pretreatment device for a bag dust collector, comprising an ash spraying chamber, a flower plate is provided on the top of the ash spraying chamber, a flower plate hole is provided in the middle of the flower plate, the flower plate hole is used to install a filter bag, a circle of blowing ring pipe is provided below the flower plate, the diameter of the blowing ring pipe is larger than the filter bag and is provided with a plurality of nozzles, the nozzles are aimed at the filter bag, the center of the blowing ring pipe coincides with the center line of the flower plate hole, the blowing ring pipe is fixedly connected to the ash spraying chamber, the blowing ring pipe is provided with an ash inlet pipe, the ash inlet pipe passes out of the ash spraying chamber and is connected to an ash supply mechanism, the ash supply mechanism is used to transport a moisture absorbent into the blowing ring pipe; a transparent observation window is provided on the side wall of the ash spraying chamber, a smoke collecting pipe is provided on the upper end of the ash spraying chamber relative to the side of the ash supply mechanism, and a valve is installed on the smoke collecting pipe.

[0007] Preferably, a lifting cover is provided on the top of the spraying chamber, and the lifting cover is used for installing and removing the filter bag.

[0008] Preferably, a plurality of nozzles are evenly mounted along the circumference of the blowing ring tube on one side facing the filter bag, and the nozzles point to the center of the blowing ring tube and are arranged at an angle of 15°-75° downward.

[0009] Preferably, the outer end of the smoke collecting pipe is connected to the inlet smoke pipe of the bag filter.

[0010] Preferably, the ash supply mechanism sprays the moisture absorbing agent into the spray ring pipe through high-pressure gas.

[0011] Preferably, a quick connector is provided at the outer end of the ash inlet pipe.

[0012] Compared with the prior art, the utility model has the following beneficial effects: the bag pretreatment device of the utility model is used for lime coating, which is easy to operate, has good lime coating effect, and solves the problem of bag sticking; and the utilization rate of the moisture absorbent is increased by 40%, reducing the use cost of the moisture absorbent. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a structural schematic diagram of the pretreatment device of the utility model;

[0014] Figure 2 yes Figure 1 AA view;

[0015] Figure 3 This is a schematic diagram of the state of the utility model applied to a bag dust collector;

[0016] In the figure: 1. ash spraying room; 2. observation window; 3. filter bag; 4. smoke collecting pipe; 5. blowing ring pipe; 51. nozzle; 52. ash inlet pipe; 6. flower plate; 7. lifting cover; 8. valve; 9. inlet smoke pipe; 10. bag filter; 11. outlet smoke pipe; 12. smoke exhaust fan; 13. ash supply mechanism. DETAILED DESCRIPTION

[0017] like Figure 1-3 As shown, this embodiment provides a bag pretreatment device for a bag dust collector 10, including an ash spraying chamber 1, a flower plate 6 is provided on the top of the ash spraying chamber 1, a flower plate hole is provided in the middle of the flower plate 6, and the flower plate hole is used to install the filter bag 3, and a circle of spray ring pipe 5 is provided below the flower plate 6. The spray ring pipe 5 is made of a φ50mm steel pipe to complete a large circle. The diameter of the spray ring pipe 5 is larger than the filter bag 3 and is provided with a plurality of nozzles 51. The nozzles 51 are aimed at the filter bag 3, and the spray ring The center of the tube 5 coincides with the center line of the flower plate hole, the blowing ring tube 5 is fixedly connected to the ash spraying chamber 1, and the blowing ring tube 5 is provided with an ash inlet pipe 52, the ash inlet pipe 52 passes through the ash spraying chamber 1 and is connected to the ash supply mechanism 13, and the ash supply mechanism 13 is used to transport moisture absorbent into the blowing ring tube 5; the side wall of the ash spraying chamber 1 is provided with a transparent observation window 2, and the upper end of the ash spraying chamber 1 is provided with a φ250mm smoke collecting pipe 4 on the side opposite to the ash supply mechanism 13, and a valve 8 is installed on the smoke collecting pipe 4.

[0018] Preferably, a hanging cover 7 is provided on the top of the spraying chamber 1, and the hanging cover 7 is used to install and remove the filter bag 3. Preferably, a plurality of nozzles 51 are evenly installed along the circumference of the spraying ring pipe 5 on one side facing the filter bag 3, and the nozzles 51 point to the center of the spraying ring pipe 5 and are arranged at a downward inclination of 15°-75°.

[0019] Preferably, the outer end of the smoke collecting pipe 4 is communicated with the inlet smoke pipe 9 of the bag filter 10. Preferably, the ash supply mechanism 13 sprays the moisture absorbing agent into the spray ring pipe 5 through high-pressure gas.

[0020] The ash supply mechanism 13 in this embodiment is composed of a storage bin, a mixer, and an air distribution device, and its structure is basically the same as that of another patent of the applicant, "A denitrification device, authorization announcement number CN217068349U". The storage bin is made of steel, and a feeding funnel and a butterfly valve are provided on the top.

[0021] The air distribution device includes an air bag and an air inlet pipe and an air outlet pipe connected to the air bag. The air source used is compressed air / nitrogen with a pressure of 0.2MPa to 0.4MPa. The air inlet pipe is connected to the air source and is used to input the compressed air / nitrogen into the air bag. The air outlet pipe is connected to the mixer and is used to input the compressed air / nitrogen in the air bag into the mixer.

[0022] The outlet of the mixer is provided with a discharge pipe, which is connected to the ash inlet pipe 52 through a quick connector. The operation method of using the utility model to process the filter bag 3 of the bag dust collector 10 is as follows: open the hanging cover 7 on the top of the ash spraying chamber 1, pass the filter bag 3 to be ash-coated from top to bottom through the flower plate hole, and then put the filter bag 3 cage frame into it to fix it on the flower plate 6.

[0023] Lime is stored in the storage bin as a moisture absorbent, and the lime enters the mixer under the action of gravity. The connection between the air inlet pipe and the air source is opened. The air source is 0.3MPa nitrogen. The nitrogen first enters the air bag through the air inlet pipe, and then enters the mixer through the air outlet pipe. The lime particles in the mixer are transported by nitrogen and sent to the ash inlet pipe 52 through the discharge pipe and the feed pipe, and then sent to the nozzle 51 through the spray ring pipe 5. The lime particles are sprayed onto the surface of the filter bag 3 through the nozzle 51, thereby achieving lime coating.

[0024] During the lime coating process, after observing through the observation window 2 that the surface of the filter bag 3 is evenly coated with lime, the connection between the air inlet pipe and the air source is closed.

[0025] Open the lifting cover 7, clamp the inner side of the filter bag 3 cage frame with the hook, take out the filter bag 3 cage frame and the filter bag 3 and put them into the flower plate hole of the bag filter 10, and then put the next filter bag 3 into the ash spraying room 1 and perform the ash coating operation according to the above method.

[0026] When all the filter bags 3 of the bag filter 10 are coated with lime and installed back into the dust collector, the valve 8 of the smoke collecting pipe 4 is opened, and the smoke exhaust fan 12 is started to form a negative pressure in the ash spraying chamber 1, so that the lime remaining in the ash spraying chamber 1 is sucked into the bag filter 10 through the inlet smoke pipe 9, achieving secondary lime coating, while also improving the utilization rate of lime and reducing the cost of lime use.

Claims

1. A bag pretreatment device for a bag dust collector, characterized in that: It includes an ash spraying chamber, a flower plate is provided on the top of the ash spraying chamber, a flower plate hole is provided in the middle of the flower plate, the flower plate hole is used to install a filter bag, a circle of blowing ring pipe is provided below the flower plate, the diameter of the blowing ring pipe is larger than the filter bag and a plurality of nozzles are provided, the nozzles are aimed at the filter bag, the center of the blowing ring pipe coincides with the center line of the flower plate hole, the blowing ring pipe is fixedly connected to the ash spraying chamber, the blowing ring pipe is provided with an ash inlet pipe, the ash inlet pipe passes out of the ash spraying chamber and is connected to an ash supply mechanism, the ash supply mechanism is used to transport a desiccant into the blowing ring pipe; a transparent observation window is provided on the side wall of the ash spraying chamber, a smoke collecting pipe is provided on the upper end of the ash spraying chamber opposite to the side of the ash supply mechanism, and a valve is installed on the smoke collecting pipe.

2. The bag pretreatment device for a bag dust collector according to claim 1, characterized in that: A hanging cover is arranged on the top of the ash spraying chamber, and the hanging cover is used for installing and removing the filter bag.

3. The bag pretreatment device for a bag dust collector according to claim 1, characterized in that: A plurality of nozzles are evenly arranged along the circumference of the spray ring tube on one side facing the filter bag. The nozzles point to the center of the spray ring tube and are arranged with a downward inclination of 15°-75°.

4. The bag pretreatment device for a bag dust collector according to claim 1, characterized in that: The outer end of the smoke collecting pipe is communicated with the inlet smoke pipe of the bag filter.

5. The bag pretreatment device for a bag dust collector according to claim 1, characterized in that: The ash supply mechanism sprays the moisture absorbing agent into the spraying ring pipe through high-pressure gas.

6. The bag pretreatment device for a bag dust collector according to claim 1, characterized in that: The outer end of the ash inlet pipe is provided with a quick connector.

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