CN107684796B

CN107684796B - Waste gas dust removal system

Info

Publication number: CN107684796B
Application number: CN201710814944.6A
Authority: CN
Inventors: 徐燮坚
Original assignee: Ningbo Jietong Environmental Protection Engineering Co ltd
Current assignee: Ningbo Jietong Environmental Protection Engineering Co ltd
Priority date: 2017-09-11
Filing date: 2017-09-11
Publication date: 2021-04-06
Anticipated expiration: 2037-09-11
Also published as: CN107684796A

Abstract

A waste gas dust removal system comprises a cyclone dust collector, a bag-type dust collector, a cyclone tower and a fan, wherein a first air outlet of the cyclone dust collector is communicated with a second air inlet of the bag-type dust collector, a second air outlet of the bag-type dust collector is communicated with a third air inlet of the cyclone tower, and a third air outlet of the cyclone tower is communicated with the outside through the fan. Through adopting above-mentioned technical scheme, waste gas can pass through cyclone at first for the great granule of specification can sink into cyclone's bottom along with the effect of centrifugal force among the dust granule, thereby tentatively purified waste gas. And when waste gas passes through the bag-type dust collector, the waste gas needs to be filtered by the bag, so that most of dust particles can be blocked in the bag. And the last whirl tower can make waste gas form the whirlwind to reuse centrifugal action, get rid of the dust granule to the wall of whirl tower, and then be favorable to the dust granule to sink.

Description

Waste gas dust removal system

Technical Field

The invention relates to the field of waste gas treatment, in particular to a waste gas dedusting system.

Background

The aluminum element is second to oxygen and silicon in the earth crust, and is the most abundant metal element in the earth crust. With the rapid development of three important industries of aviation, building and automobile in China, the requirements on the quality and quantity of aluminum metal materials are higher and higher. Therefore, the rapid development of the aluminum industry in China is greatly promoted, the contradiction between the supply and demand of the original aluminum resource is increasingly prominent, the recovery and utilization of the regenerated aluminum resource are vigorously developed, and the method is a necessary way for the development of the aluminum industry. However, during the melting of aluminum, a large amount of dust particles are easily generated from combustion products of fuel and internal impurities of the molten secondary aluminum, and are discharged together with the exhaust gas.

Which, if discharged directly into the atmosphere, can cause serious pollution to the atmosphere. Especially in autumn and winter, the weather is dry, and the moisture in the air is less, so that dust particles are dispersed, and the pm2.5 standard exceeding problem is caused.

For this reason, it is necessary to perform a corresponding environmental treatment on the aluminum melting waste gas before the discharge.

Disclosure of Invention

The invention aims to provide an exhaust gas dedusting system which is convenient to operate and can completely remove dust particles in exhaust gas, so that the exhaust gas is subjected to relevant standards of composite emission.

The above object of the present invention is achieved by the following technical solutions: an exhaust gas dedusting system, characterized in that: the cyclone dust collector comprises a cyclone dust collector, a bag-type dust collector, a cyclone tower and a fan, wherein a first air outlet of the cyclone dust collector is communicated with a second air inlet of the bag-type dust collector, a second air outlet of the bag-type dust collector is communicated with a third air inlet of the cyclone tower, and a third air outlet of the cyclone tower is communicated with the outside through the fan.

Through adopting above-mentioned technical scheme, waste gas can pass through cyclone at first for the great granule of specification can sink into cyclone's bottom along with the effect of centrifugal force among the dust granule, thereby tentatively purified waste gas.

And when waste gas passes through the bag-type dust collector, the waste gas needs to be filtered by the bag, so that most of dust particles can be blocked in the bag. And the last whirl tower can make waste gas form the whirlwind to reuse centrifugal action, get rid of the dust granule to the wall of whirl tower, and then be favorable to the dust granule to sink.

Preferably, the sack cleaner includes dust removal case and ash bucket, the air intake is two in the side of ash bucket, top-down is equipped with respectively and has the last parallel plate and the lower parallel plate that correspond the perforation in the dust removal incasement, air outlet two is located the top of last parallel plate, goes up the parallel plate and has the sack of a plurality of vertical tube-shapes down between the parallel plate, the upper end of sack seals and is fixed mutually with last parallel plate, and the upper end of sack is corresponding with the perforation of last parallel plate simultaneously, the lower extreme of sack has the sack, the sack edge of sack is fixed mutually with the perforation edge of lower parallel plate, the perforation department of going up the parallel plate is provided with the gas blow pipe.

Through adopting above-mentioned technical scheme, when the adnexed volume of dust granule is too much on the sack, the gas blow pipe then can blow in the perforation of the parallel plate that makes progress to the sack that corresponds will take place the shake, and then the dust granule will be followed and gone up the perforation through on sack and the parallel plate down and fall into in the ash bucket. Thus, the cloth bag is cleaned.

Preferably, the insufflation tube is provided with a pulse valve.

Through adopting above-mentioned technical scheme, the pulse valve can play the control action to the gas blow pipe to can make the gas blow pipe blow towards the sack discontinuously, can avoid dust particle to pile up thickly on the sack like this, guarantee that waste gas can be normal continuously normally see through the sack.

Preferably, the bottom side of the dust hopper is provided with a dust outlet, and a collecting bag with a filtering hole is sleeved on the dust outlet.

By adopting the technical scheme, when dust particles in the dust hopper are accumulated too much, the dust outlet is opened as long as the pulse valve is started, and compressed air blown out by the air blowing pipe pushes dust in the dust hopper into the collecting bag, so that the dust hopper is cleaned.

And, at this in-process, the air that gets into in the collection bag can see through the filtration pore outflow on the collection bag to the collection bag has been guaranteed to the stable accomodating of dust. And because the dust outlet is positioned on the side surface of the dust hopper, when the air blowing pipe stops blowing air, the collecting bag can also droop under the action of gravity, so that the bag opening of the collecting bag is automatically sealed, and the probability of dust escaping from the bag opening is reduced.

Preferably, a guide plate connected with the upper edge of the second air inlet is arranged in the ash bucket, and the guide plate is bent downwards.

Through adopting above-mentioned technical scheme, like this when the dust granule is shaken off from the sack, the guide plate can be with in the dust granule direction ash bucket to the probability that the dust enters into in the air intake two has been reduced.

Preferably, the cross section of the ash hopper below the air inlet is covered with flow blocking plates, the vertical sections of the flow blocking plates are in an inverted V shape, and a gap exists between every two adjacent flow blocking plates.

Through adopting above-mentioned technical scheme, the dust granule that is shaken off on the one hand is owing to receive the hindrance of spoiler to be difficult to appear the problem of kicking up again, and on the other hand dust granule can follow the surface of spoiler again and enter into the bottom of ash bucket through the clearance between two spoilers. Thereby greatly improving the dust removal efficiency of the bag-type dust remover.

Preferably, the device comprises an activated carbon absorber positioned between the bag-type dust collector and the cyclone tower, and a plurality of activated carbon plates parallel to the flowing direction of the waste gas are arranged in the activated carbon absorber.

Through adopting above-mentioned technical scheme, be on a parallel with the activated carbon plate of waste gas flow direction, can guarantee that waste gas passes through activated carbon absorber fast, also can make waste gas take place the torrent in activated carbon absorber simultaneously, and then just also guaranteed the efficiency to tiny dust purification in the waste gas.

Preferably, the middle part of the cyclone dust collector is provided with an air outlet pipe communicated with the first air outlet, and a bucket-shaped filter plate is arranged in the air outlet pipe.

Through adopting above-mentioned technical scheme, waste gas is when seeing through the filter, and its inside dust granule will be blockked by the filter, and then the dust granule will fall back to cyclone's bottom. On the other hand, the waste gas passing through the middle through hole of the filter plate is obviously increased due to the front space and the rear space, the flow velocity of the waste gas is reduced, and therefore the dust particles fall on the upper surface of the filter plate. And the dust removing function is easily realized.

Preferably, a plurality of rotational flow plates are arranged in the rotational flow tower from top to bottom, and a spray header for adsorbing liquid is arranged below each rotational flow plate.

Through adopting above-mentioned technical scheme, after the absorption liquid sprays out, more tiny dust particle can be adsorbed to its vaporific water droplet to under the effect of gravity, have the vaporific water droplet of dust particle and will fall down, and then just further improved dust removal effect.

Preferably, the adsorption liquid is a mixture of water and the hydrophilic hydroxyl polymer, and the volume ratio of the water to the hydrophilic hydroxyl polymer is 6-8: 1.

Through adopting above-mentioned technical scheme, add to water and have hydrophilic hydroxyl polymer, can make both even mixings be in the same place on the one hand, on the other hand also can improve the viscosity of water to be favorable to improving the adsorption to the dust.

In conclusion, the invention has the following beneficial effects:

1. the dust particles in the waste gas can be completely filtered by utilizing the cloth bag, so that the purification efficiency of the waste gas is improved;

2. the dust outlet is arranged on the side surface of the dust hopper, so that after dust particles are collected by the collecting bag, the collecting bag can droop under the action of gravity, the bag opening can be sealed, and the dust escaping probability is reduced;

3. the hydrophilic hydroxyl polymer is added into the adsorption liquid mainly containing water, so that the viscosity of the water can be improved under the condition of ensuring the normal fluidity of the water, and the adsorption effect on dust particles is easier.

Drawings

FIG. 1 is a schematic diagram of an exhaust gas dedusting system according to an embodiment;

FIG. 2 is a schematic structural view of a cyclone dust collector in accordance with one embodiment;

FIG. 3 is a cross-sectional view taken at A-A of FIG. 2;

FIG. 4 is a schematic structural diagram of a bag-type dust collector in the first embodiment;

FIG. 5 is a cross-sectional view taken at B-B of FIG. 4;

FIG. 6 is a schematic structural diagram of a cyclone tower in the first embodiment;

FIG. 7 is a cross-sectional view at C-C of FIG. 6;

FIG. 8 is a schematic structural diagram of a blower fan according to the first embodiment;

FIG. 9 is a schematic configuration diagram of an exhaust gas dedusting system in accordance with a second embodiment;

FIG. 10 is a schematic view showing the structure of an activated carbon adsorber according to a second embodiment;

fig. 11 is a sectional view at D-D of fig. 10.

In the figure, 1, a cyclone dust collector; 11. an air duct; 111. a first air inlet; 12. an air outlet pipe; 121. an air outlet I; 122. a filter plate; 1221. a through hole; 13. a dust falling port; 14. an air inlet main pipe; 15. an air outlet main pipe; 2. a bag-type dust collector; 21. a dust removal box; 211. an air outlet II; 212. a lower parallel plate; 213. an upper parallel plate; 214. a cloth bag; 215. perforating; 216. an air blowing pipe; 2161. a blowing nozzle; 217. a pulse valve; 218. a gas buffer tank; 22. an ash hopper; 221. an air inlet II; 222. a baffle; 223. a spoiler; 224. a dust outlet; 225. a collection bag; 3. a cyclone tower; 31. an air inlet III; 32. an air outlet III; 33. a swirl plate; 34. a shower head; 35. a water pump; 36. a circulating water tank; 4. a fan; 41. an exhaust duct; 5. an activated carbon adsorber; 51. an air inlet IV; 52. an air outlet IV; 53. an activated carbon plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The first embodiment is as follows:

as shown in the attached figure 1, the waste gas dust removal system comprises a cyclone dust collector 1, a bag-type dust collector 2, a cyclone tower 3 and a fan 4, wherein the cyclone dust collector 1, the bag-type dust collector 2, the cyclone tower 3 and the fan 4 are sequentially communicated in sequence, so that waste gas is purified by the cyclone dust collector 1, the bag-type dust collector 2 and the cyclone tower 3 in sequence and is finally discharged into the atmosphere under the action of the fan 4.

Firstly, as shown in fig. 2 and fig. 3, the number of the cyclone dust collectors 1 can be determined according to the amount of the actually purified exhaust gas, the number of the cyclone dust collectors 1 is two, the two cyclone dust collectors 1 include a spiral air duct 11 and an air outlet pipe 12 which is located at the center of the air duct 11 and is vertically arranged, wherein the air duct 11 is communicated with the bottom of the air outlet pipe 12. Meanwhile, the first air inlet 111 of the air duct 11 and the first air outlet 121 of the air outlet pipe 12 are both located above the cyclone dust collector 1. And the first air inlet 111 and the first air outlet 121 of the two cyclone dust collectors 1 are respectively communicated with the main air inlet pipe 14 and the main air outlet pipe 15. Meanwhile, the bottom of the cyclone dust collector 1 is provided with a dust falling port 13.

Thus, after the exhaust gas enters the air duct 11 from the air intake manifold 14, the exhaust gas spirally flows along the air duct 11. The larger sized dust particles are thrown against the side walls of the air duct 11, and are gradually compacted to form a dust pile at a position close to the side walls of the air duct 11. Due to the relatively large weight and volume of the dust pile, the dust pile falls to the bottom of the cyclone dust collector 1 and can be discharged from the dust falling port 13. And the waste gas flows upwards from the air outlet pipe 12 and is converged into the air outlet main pipe 15, and flows to a downstream treatment process for treatment.

Meanwhile, a plurality of bucket-shaped filter plates 122 are arranged from top to bottom in the air outlet pipe 12, so that part of the waste gas directly penetrates through the filter plates 122 in the rising process of the waste gas, and part of dust particles are blocked below the filter plates 122. And another part of the exhaust gas passes through the middle through hole 1221 of the filter plate 122, so that the flow velocity of the exhaust gas is appropriately reduced due to the significant increase of the front and rear spaces, and then part of the dust falls on the upper surface of the filter plate 122. When the cyclone 1 is shut down, all the dust attached to the filter plates 122 falls down, thereby further improving the dust removing efficiency of the cyclone 1.

Furthermore, as shown in fig. 4 and 5, the bag-type dust collector 2 includes a dust collection box 21 and an ash bucket 22, wherein the ash bucket 22 is located below the dust collection box 21, the number of the bag-type dust collectors 2 can be determined according to actual needs, and the number of the bag-type dust collectors 2 is also two. The dust hoppers 22 of the two bag-type dust collectors 2 are communicated with each other, and the tops of the dust removing boxes 21 are also communicated with each other. Meanwhile, the second air inlet 221 of the bag-type dust collector 2 is located on the side of one of the ash hoppers 22, and the second air outlet 211 of the bag-type dust collector is located on the side of the dust removing box 21 close to the top. Here, the second air inlet 221 is communicated with the main air outlet pipe 15.

The bottom and the position near the top of each dust removing box 21 are respectively provided with a lower parallel plate 212 and an upper parallel plate 213. Here, the upper parallel plate 213 is lower than the second air outlet 211. Wherein, a cloth bag 214 in the vertical direction is also arranged between the upper parallel plate 213 and the lower parallel plate 212, and the inside of the cloth bag 214 is supported by a framework. The upper end of the cloth bag 214 is closed, and the lower end of the cloth bag 214 is provided with a bag opening. And the upper parallel plate 213 and the lower parallel plate 212 are provided with corresponding through holes 215. The upper end of the cloth bag 214 corresponds to the through hole 215 of the upper parallel plate 213 and is connected with the upper parallel plate 213. The mouth of the cloth bag 214 corresponds to the through hole 215 of the lower parallel plate 212, and the edge of the mouth of the cloth bag is fixed with the edge of the through hole 215 of the lower parallel plate 212. In addition, here, the through holes 215 of the upper parallel plate 213 are arranged in rows and columns, each row of through holes 215 is provided with a blowing pipe 216, the blowing pipe 216 is provided with a blowing nozzle 2161 facing the inside of the through hole 215, all the blowing pipes 216 are communicated with a gas buffer tank 218 arranged outside the dust removing box 21, the gas buffer tank 218 is communicated with an air compressor, and each blowing pipe 216 is provided with a pulse valve 217.

Here, after the exhaust gas enters the bag dust collector 2, the exhaust gas is filtered by the bag 214 and then discharged, and the dust particles attach to the bag 214. When the dust particles on the cloth bag 214 are too much, the pulse valve 217 is opened at a certain time, the compressed air is blown out from the air blowing nozzle 2161, so that the cloth bag 214 shakes from outside to inside, the dust particles fall into the dust hopper 22 from the bag opening, and the rate of the waste gas flowing through the dust removal box 21 is ensured.

Meanwhile, a downward bent guide plate 222 is arranged in the ash bucket 22, the guide plate 222 is a quarter circle, the radius of the guide plate 222 is half of the height of the second air inlet 221, and the upper edge of the guide plate 222 is fixed with the upper edge of the second air inlet 221. Therefore, on one hand, the waste gas can be ensured to flow into the ash hopper 22 from the second air inlet 221 normally, and on the other hand, when the dust particles are shaken off, the guide plate 222 can also play a role in blocking, so that the shaken off dust particles are prevented from entering the second air inlet 221 again to influence the purification efficiency of the waste gas.

Moreover, the cross section of the ash bucket 22 below the second air inlet 221 is covered with a plurality of flow blocking plates 223 with inverted V-shaped vertical sections, the flow blocking plates 223 are arranged in rows, and a gap exists between every two adjacent flow blocking plates 223, so that dust particles can easily pass through the gap. Thus, after the dust particles are shaken off, the flow blocking plate 223 can block the dust particles from diffusing to the peripheral surface, so that the dust particles are difficult to raise again, and in addition, the inclined surface of the flow blocking plate 223 can guide the dust particles to enter the gap between the two flow blocking plates 223 more easily, so that the dust particles are easy to collect at the bottom of the ash hopper 22. At this time, a dust outlet 224 is further provided at the bottom side of the dust hopper 22, and a collecting bag 225 with filter holes is fitted over the dust outlet 224, so that air can exit through the filter holes and dust is collected in the collecting bag 225. And because the dust outlet 224 is open on the side, when air pushes dust into the collecting bag 225, the collecting bag 225 will quickly bulge, and the dust will easily enter into the collecting bag 225, and after the dust is collected, the collecting bag 225 will naturally sag under the action of gravity, so that the opening of the collecting bag 225 is also closed, and the probability of dust entering the dust hopper 22 again is reduced.

Next, as shown in fig. 6 and 7, the air inlet third 31 and the air outlet second 211 on the side surface of the cyclone tower 3 near the bottom are communicated. A plurality of swirl plates 33 are arranged on the cross section of the swirl tower 3 from top to bottom, and rows of spray headers 34 are arranged below each swirl plate 33. The shower head 34 is connected to an external circulation tank 36 through a water pump 35, and the bottom of the cyclone tower 3 is also connected to the circulation tank 36, and the circulation tank 36 contains an adsorption liquid, so that the efficiency of recycling the adsorption liquid can be improved.

After in waste gas enters into whirl tower 3, it can form whirlwind under whirl board 33's effect to after the absorption liquid sprays down, waste gas can with the abundant mixed contact of absorption liquid, the tiny dust particle in the waste gas will be adsorbed by the absorption liquid this moment, and then improved waste gas purification efficiency greatly. The adsorption liquid is mainly a mixture of water and the hydrophilic hydroxyl polymer, wherein the volume ratio of the water to the hydrophilic hydroxyl polymer can be 6-8: 1, and preferably 7: 1. And the hydrophilic hydroxyl polymer can be polyvinyl alcohol, polyvinyl butyral, carboxymethyl cellulose and the like, so that on one hand, the water and the hydrophilic hydroxyl polymer can be uniformly and stably mixed together, and on the other hand, the viscosity of the water body is favorably enhanced, thereby being more easily adsorbing medium dust and being favorable for improving the purification efficiency of waste gas.

Finally, as shown in fig. 8, the fan 4 is communicated with the air outlet three 32, and the exhaust duct 41 of the fan 4 can be arranged according to actual conditions, wherein the exhaust duct 41 is arranged obliquely upwards, and the included angle between the exhaust duct 41 and the horizontal plane is 45 degrees, so that possible tiny dust particles in the waste gas can be diffused as much as possible, and the probability that the local dust particles are too dense to influence the life of people is reduced.

Example two:

as shown in fig. 9 to 11, based on the first embodiment, an activated carbon adsorber 5 is further disposed between the bag-type dust collector 2 and the cyclone tower 3, a top air inlet fourth 51 of the activated carbon adsorber 5 is communicated with an air outlet second 211, and a side air outlet fourth 52 of the activated carbon adsorber 5 is communicated with an air inlet third 31. And the center lines of both the four intake ports 51 and the four exhaust ports 52 are perpendicular to each other.

Here, a plurality of activated carbon plates 53 are arranged in the activated carbon adsorber 5 in parallel to the direction of the whole flow of the exhaust gas, and the adjacent activated carbon plates 53 are equidistant, so that after the exhaust gas enters the activated carbon adsorber, the exhaust gas is easy to generate turbulence, so that dust particles are easy to collide with the activated carbon plates 53 and are adsorbed by the activated carbon plates 53, thereby ensuring that the exhaust gas can rapidly and smoothly pass through the activated carbon adsorber 5, and simultaneously, the exhaust gas is easy to be effectively purified, and the purification efficiency of the whole system is improved.

Waste gas containing dust particles with different specifications and contents is processed by the waste gas dedusting system, and finally, the dust detector is used for detecting the waste gas discharged by the fan, so that the following data are obtained:

as is apparent from the table above, the quality of the treated waste gas can basically meet the level of high-quality air, so that the method is suitable for large-scale popularization and application in industries with large dust generation amount, and is beneficial to reducing the pollution to the atmosphere.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

Claims

1. An exhaust gas dedusting system, characterized in that: comprises a cyclone dust collector (1), a bag-type dust collector (2), an active carbon absorber (5), a cyclone tower (3) and a fan (4), wherein the middle part of the cyclone dust collector (1) is provided with an air outlet pipe (12) communicated with an air outlet I (121), a hopper-shaped filter plate (122) is arranged in the air outlet pipe (12), the air outlet pipe (12) is communicated with an air inlet II (221) of the bag-type dust collector (2), an air outlet II (211) of the bag-type dust collector (2) is communicated with the active carbon absorber (5), the active carbon absorber (5) is communicated with an air inlet III (31) of the cyclone tower (3), a plurality of active carbon plates (53) parallel to the flow direction of waste gas are arranged in the active carbon absorber (5), an air outlet III (32) of the cyclone tower (3) is communicated with the outside through the fan (4), the bag-type dust collector (2) comprises a dust collection box (21) and an ash hopper (22, the second air inlet (221) is located on the side face of the ash bucket (22), an upper parallel plate (213) and a lower parallel plate (212) with corresponding through holes (215) are respectively arranged in the dust removing box (21) from top to bottom, the second air outlet (211) is located above the upper parallel plate (213), a plurality of vertical cylindrical cloth bags (214) are arranged between the upper parallel plate (213) and the lower parallel plate (212), the upper ends of the cloth bags (214) are sealed and fixed with the upper parallel plate (213), meanwhile, the upper ends of the cloth bags (214) correspond to the through holes (215) of the upper parallel plate (213), the lower ends of the cloth bags (214) are provided with bag openings, the edges of the bag openings of the cloth bags (214) are fixed with the edges of the through holes (215) of the lower parallel plate (212), air blow pipes (216) are arranged at the through holes (215) of the upper parallel plate (213), and guide plates (222) connected with the upper edges of the second air inlet (, the novel cyclone tower is characterized in that the guide plate (222) is bent downwards, the guide plate is a quarter circle and the radius of the guide plate is one half of the height of the air inlet II, a spoiler (223) covers the cross section of the ash bucket (22) below the air inlet, the vertical section of the spoiler (223) is in an inverted V shape, a gap exists between every two adjacent spoilers (223), a plurality of cyclone plates (33) are arranged in the cyclone tower (3) from top to bottom, a spray header (34) of adsorption liquid is arranged below each cyclone plate (33), the adsorption liquid is a mixture of water and hydrophilic hydroxyl polymer, and the volume ratio of the water to the hydrophilic hydroxyl polymer is 7: 1.

2. an exhaust gas dedusting system as set forth in claim 1, wherein: the air blow pipe (216) is provided with a pulse valve (217).

3. An exhaust gas dedusting system as set forth in claim 2, wherein: the bottom side surface of the ash bucket (22) is provided with a dust outlet (224), and a collecting bag (225) with filtering holes is sleeved on the dust outlet (224).