CN105642062A - Device and method for removing fine particles in gas in supergravity manner - Google Patents
Device and method for removing fine particles in gas in supergravity manner Download PDFInfo
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- CN105642062A CN105642062A CN201610118824.8A CN201610118824A CN105642062A CN 105642062 A CN105642062 A CN 105642062A CN 201610118824 A CN201610118824 A CN 201610118824A CN 105642062 A CN105642062 A CN 105642062A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D50/00—Combinations of methods or devices for separating particles from gases or vapours
- B01D50/40—Combinations of devices covered by groups B01D45/00 and B01D47/00
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D47/00—Separating dispersed particles from gases, air or vapours by liquid as separating agent
- B01D47/14—Packed scrubbers
Abstract
The invention belongs to the technical field of supergravity dedusting, aims at solving the problem that existing supergravity dedusting methods are low in fine particle removing rate, high and unstable in energy consumption, prone to causing packing blockage when being used for treating high-concentration dust-containing gas and incapable of realizing continuous running and provides a device and a method for removing fine particles in gas in a supergravity manner. A gas inlet of a supergravity rotating packing bed is connected with a dust-containing gas source through a vortex shedding flowmeter, a liquid inlet is connected with a liquid storage tank through a liquid pump, a liquid outlet is connected with the liquid storage tank through a U-shaped liquid sealing device, the gas inlet is tangentially arranged outside a shell of the supergravity rotating packing bed, a square diversion inlet plate is mounted at the gas inlet, a packing layer is arranged in the supergravity rotating packing bed, and packing is plastic Pall ring packing. Total dedusting efficiency is up to 99.6%, grading efficiency is remarkably improved, and the device and the method are more suitable for removing the fine particles in the gas. The device is lower in economic cost, more stable in running, low in energy consumption, suitable for industrial application, free of blockage, supportive of continuous running, light in weight and convenient to transport.
Description
Technical field
The invention belongs to high gravity dedusting technical field, be specifically related to a kind of hypergravity and remove the apparatus and method of fine particle in gas.
Background technology
Fine particle is (also known as PM2.5) refer to the aerodynamic diameter dust less than 2.5 ��m, its specific surface area is big, it is possible to adsorbs various poisonous and harmful substances and is deposited on human lung, causes cardiovascular and cerebrovascular disease and pulmonary carcinoma, serious harm health, is also the arch-criminal that " haze " phenomenon frequently occurs in recent years. In the industrial waste gas of the fixed-contamination source emissions such as coal fired power generation, chemical industry, smelting, PETROLEUM PROCESSING, containing a large amount of fine particles, it is difficult to removed by conventional dust removal device, become the main source of fine particle.
Cross_flow rotating packed bed is a kind of novel high-effective dust-removing equipment, the multiple dedusting mechanism such as centrifugal sedimentation, machinery rotary collision, inertial collision, drop seizure is integrated in one, and efficiency of dust collection is high, and pressure drop is low, and liquid-gas ratio is little, and floor space is little. There is a lot of industrial applications in recent years in dedusting direction, but the report for its elimination fine particle (particle diameter is 1-75 ��m) is less. The domestic Pulvis Talci simulation micron particles thing having bibliographical information South China Science & Engineering University to use peak diameter to be 4.73 ��m, employing multistage centrifugal atomization is high-gravity rotating bed removes fine particle, it is possible at tolerance 600m3/ h, liquid measure 0.6m3/ h, the operating condition of rotating speed 1400r/min is issued to the efficiency of dust collection of 97%. But the rotating speed that its shortcoming is required is high, is appropriate only for laboratory scale research, it is difficult to industrialization promotion. And it is little to process dust concentration, is only 4g/m3, according to conventional experiment experience, rotary packed bed easily there is filler clogging under the slow-speed of revolution, high dust concentration, causes that equipment cannot run continuously. Generally speaking, the rotary packed bed removal efficiency to fine particle of existing structure is still not as high, and fluctuation of service, industrialization promotion is hindered, haves much room for improvement.
Summary of the invention
The present invention is to solve that existing high gravity dedusting method gas is too short in the rotary packed bed middle time of staying, have little time to be caught by drop to be namely drained; Although rotary packed bed total efficiency of dust collection is high, but the removal efficiency of fine particle is still relatively low; Needing the rotating speed more than 1000r/min to can be only achieved higher efficiency of dust collection, energy consumption is high, unstable; Filler blocking is easily caused, it is impossible to the problems such as continuous operation, it is provided that the apparatus and method of fine particle in a kind of hypergravity elimination gas when processing high concentration dusty gas.
The present invention is realized by following technical scheme: the device of fine particle in a kind of hypergravity elimination gas, including the cross_flow rotating packed bed being provided with gas inlet and outlet and liquid entrance, the gas feed of cross_flow rotating packed bed connects dust-laden source of the gas by vortex-shedding meter, liquid-inlet connects reservoir by liquid pump, liquid outlet connects reservoir by U-shaped liquid seal device, the gas feed of described cross_flow rotating packed bed is tangentially-arranged in cross_flow rotating packed bed hull outside, back-shaped water conservancy diversion inlet plate is installed in gas feed place, packing layer it is provided with in cross_flow rotating packed bed, the filler of packing layer is plastics Pall ring filler.
Described back-shaped water conservancy diversion inlet plate is that baffle plate is installed along gas feed is alternately interspersed, and back-shaped water conservancy diversion inlet plate length is 1/3rd of gas inlet duct diameter, and the width of back-shaped water conservancy diversion inlet plate is 1/2nd of back-shaped water conservancy diversion inlet plate length. Described plastics Pall ring filler surface is provided with matte embossing, and the external diameter of plastics Pall ring filler is 16-50mm. Described cross_flow rotating packed bed is Cross-Flow Rotating Packed Bed.
Utilize the method for fine particle in the device elimination gas of fine particle in above-mentioned hypergravity elimination gas, specifically comprise the following steps that dusty gas from dust-laden source of the gas after vortex-shedding meter, along back-shaped tangential entrance cross_flow rotating packed bed, reactant liquor in reservoir is delivered to high-gravity rotating bed by liquid pump, gas-liquid two-phase is in packing layer haptoreaction, complete the fine particle in elimination gas, reacted liquid is discharged from liquid outlet, enters in reservoir and recycle after U-shaped liquid seal device; The gas of elimination fine particle discharges cross_flow rotating packed bed through gas outlet; Reactant liquor in described reservoir is mass concentration is the foaming agent solution of 0.01-0.1%, described in pass into the gas gas speed of cross_flow rotating packed bed be 10 ~ 20m/s.
The rotating speed of described cross_flow rotating packed bed is 400-600r/min, and the gas-phase pressure drop of cross_flow rotating packed bed is 150-200Pa, and the liquid-gas ratio in cross_flow rotating packed bed is 0.2-0.4L/m3. Foaming agent solution in described reservoir is the surfactant and the wetting agent that add sodium lauryl sulphate, span series or tween series in water, is configured to the foaming agent solution that mass fraction is 0.01% ~ 0.1%.
Traditional Cross-Flow Rotating Packed Bed air inlet is improved by the present invention, changes tangential back-shaped entrance into. This changes to be changed into turn clockwise by original motion straight up by airflow direction and moves upward, it is to avoid enters one jet before filler and proceeds to suddenly in bigger pipeline, and its speed granule relatively big, that energy is higher is gone out without filler. Avoid producing boundary layer separation, cause eddy current, reduce the cushion effect of gas, and then reduce turbulence. Extend the gas time of staying in bed body, be conducive to drop and the liquid film trapping process to dust.Meanwhile, the change of airflow direction increases the relative velocity between grit and drop, makes the inertial collision effect that grit is subject to increase, improves efficiency of dust collection.
Xiang Shuizhong adds foaming agent, it is configured to the foaming agent solution that mass concentration is 0.01% ~ 0.1%, the surface tension of solution significantly reduces, on the foaming agent solution filler being distributed to rotation subject to centrifugal forces of liquid distribution trough, form substantial amounts of foam particle group, there is the bigger gross area and cumulative volume, less surface tension, almost can trap all dust met with it, especially fine particle is had higher cohesion ability, liquid-gas ratio and rotating speed can be significantly reduced, improve the rotary packed bed removal efficiency to fine particle.
In order to improve the foam generating capacity of foaming agent, rotary packed bed filler has been improved, contrast by experiment, find that the gas release of the ring-like filler of Bauer is more than wire packing, and the filler of plastic material is lighter, rotary packed bed gas-phase pressure drop is also decreased to 200Pa, and the voidage of the ring-like filler of Bauer is much larger than wire packing, reduce the possibility of filler blocking when processing high concentration dusty gas, by further its surface being carried out embossed, so as to roughening, the true area of filler is improved with this, after passing into liquid, wetting areas is made to increase, improve its ability catching granule, contribute to the generation of foam, the problem of filler blocking when processing high concentration dusty gas is solved while reducing equipment pressure drop.
The invention solves the problems with of traditional method: (1) gas is too short in the rotary packed bed middle time of staying, have little time to be caught by drop to be namely drained; (2) although rotary packed bed total efficiency of dust collection is high, but the removal efficiency of fine particle is still relatively low; (3) needing the rotating speed more than 1000r/min to can be only achieved higher efficiency of dust collection, energy consumption is high, unstable; (4) filler blocking is easily caused when processing high concentration dusty gas, it is impossible to run continuously.
After having the following characteristics that improvement compared with existing hypergravity wet dedusting method, total efficiency of dust collection is up to 99.6% for the present invention, and classification efficiency also more traditional high gravity dedusting method is significantly increased, wherein, and PM2.5Removal efficiency be more than 95%, PM1.0Removal efficiency be more than 88%, be more suitable for elimination gas in fine particle. The liquid-gas ratio that elimination fine particle is suitable for is 0.2 ~ 0.4L/m3, liquid can be recycled, although with the addition of trace foaming agent, and Financial cost still reduces 20%. Running more stable, energy consumption is lower, is more suitable for commercial Application. The filler of cross_flow rotating packed bed is plastics Pall ring, and porosity is big, does not block, continuously-running when processing high concentration dusty gas. During elimination fine particle, gas-phase pressure drop is 150 ~ 200Pa, and more conventional high gravity dedusting equipment reduces at least 50%. The weight of the cross_flow rotating packed bed after improvement is more light, convenient transport.
Accompanying drawing explanation
Fig. 1 is the structural representation of the device of fine particle in a kind of hypergravity of the present invention elimination gas; Fig. 2 is the structural representation of cross_flow rotating packed bed; Fig. 3 is hollow refluence inlet plate structural representation; Fig. 4 is former cross_flow rotating packed bed gas feed schematic diagram; Fig. 5 is cross_flow rotating packed bed gas feed schematic diagram of the present invention.
In figure: 1-cross_flow rotating packed bed; 1.1-gas feed; 1.2-liquid-inlet; 1.3-liquid outlet; 1.4-packing layer;1.5-gas outlet; 2-vortex-shedding meter; 3-dust-laden source of the gas; 4-liquid pump; 5-reservoir; 6-U type liquid seal device; The back-shaped water conservancy diversion inlet plate of 7-.
Detailed description of the invention
The apparatus and method of hypergravity provided by the present invention elimination fine particle are further illustrated below in conjunction with drawings and Examples.
Such as Fig. 1, shown in Fig. 2, the device of fine particle in a kind of hypergravity elimination gas, including the cross_flow rotating packed bed 1 being provided with gas inlet and outlet and liquid entrance, the gas feed 1.1 of cross_flow rotating packed bed 1 connects dust-laden source of the gas 3 by vortex-shedding meter 2, liquid-inlet 1.2 connects reservoir 5 by liquid pump 4, liquid outlet 1.3 connects reservoir 5 by U-shaped liquid seal device 6, the gas feed 1.1 of described cross_flow rotating packed bed 1 is tangentially-arranged in cross_flow rotating packed bed 1 hull outside, gas feed 1.1 place installs back-shaped water conservancy diversion inlet plate 7, packing layer 1.4 it is provided with in cross_flow rotating packed bed 1, the filler of packing layer 1.4 is plastics Pall ring filler.
Described back-shaped water conservancy diversion inlet plate 7 is installed along gas feed 1.1 is alternately interspersed for baffle plate, and back-shaped water conservancy diversion inlet plate 7 length is 1/3rd of gas feed 1.1 pipe diameter, and the width of back-shaped water conservancy diversion inlet plate 7 is 1/2nd of back-shaped water conservancy diversion inlet plate 7 length. Described plastics Pall ring filler surface is provided with matte embossing, and the external diameter of plastics Pall ring filler is 16-50mm. Described cross_flow rotating packed bed 1 is Cross-Flow Rotating Packed Bed.
As shown in Figure 4, the airflow direction of traditional Cross-Flow Rotating Packed Bed is for move straight up, as it is shown in figure 5, the present invention is changed into tangential back-shaped entrance. This changes to be changed into turn clockwise by original motion straight up by airflow direction and moves upward, it is to avoid enters one jet before filler and proceeds to suddenly in bigger pipeline, and its speed granule relatively big, that energy is higher is gone out without filler. Avoid producing boundary layer separation, cause eddy current, reduce the cushion effect of gas, and then reduce turbulence. Extend the gas time of staying in bed body, be conducive to drop and the liquid film trapping process to dust. Meanwhile, the change of airflow direction increases the relative velocity between grit and drop, makes the inertial collision effect that grit is subject to increase, improves efficiency of dust collection.
Xiang Shuizhong adds foaming agent, it is configured to the foaming agent solution that mass concentration is 0.01% ~ 0.1%, the surface tension of solution significantly reduces, on the foaming agent solution filler being distributed to rotation subject to centrifugal forces of liquid distribution trough, form substantial amounts of foam particle group, there is the bigger gross area and cumulative volume, less surface tension, almost can trap all dust met with it, especially fine particle is had higher cohesion ability, liquid-gas ratio and rotating speed can be significantly reduced, improve the rotary packed bed removal efficiency to fine particle.
In order to improve the foam generating capacity of foaming agent, rotary packed bed filler has been improved, contrast by experiment, find that the gas release of the ring-like filler of Bauer is more than wire packing, and the filler of plastic material is lighter, rotary packed bed gas-phase pressure drop is also decreased to 200Pa, and the voidage of the ring-like filler of Bauer is much larger than wire packing, reduce the possibility of filler blocking when processing high concentration dusty gas, by further its surface being carried out embossed, so as to roughening, the true area of filler is improved with this, after passing into liquid, wetting areas is made to increase, improve its ability catching granule, contribute to the generation of foam, the problem of filler blocking when processing high concentration dusty gas is solved while reducing equipment pressure drop.
Utilize the method for fine particle in the device elimination gas of fine particle in described hypergravity elimination gas, specifically comprise the following steps that dusty gas from dust-laden source of the gas 3 after vortex-shedding meter 2, along back-shaped tangential entrance cross_flow rotating packed bed 1, reactant liquor in reservoir 5 is delivered to high-gravity rotating bed 1 by liquid pump 4, gas-liquid two-phase is in packing layer 1.4 haptoreaction, complete the fine particle in elimination gas, reacted liquid is discharged from liquid outlet 1.3, enters in reservoir 5 and recycle after U-shaped liquid seal device 6;The gas of elimination fine particle discharges cross_flow rotating packed bed 1 through gas outlet 1.5; Reactant liquor in described reservoir 5 is mass concentration is the foaming agent solution of 0.01-0.1%, described in pass into the gas gas speed of cross_flow rotating packed bed 1 be 10 ~ 20m/s.
The rotating speed of described cross_flow rotating packed bed is 400-600r/min, and the gas-phase pressure drop of cross_flow rotating packed bed is 150-200Pa, and the liquid-gas ratio in cross_flow rotating packed bed is 0.2-0.4L/m3. Foaming agent solution in described reservoir is the surfactant and the wetting agent that add sodium lauryl sulphate, span series or tween series in water, is configured to the foaming agent solution that mass fraction is 0.01% ~ 0.1%.
Embodiment 1: the dust concentration of certain steel mill blast furnace tail gas is about 10g/m3, carrying out pilot experiment as dusty gas, process tolerance is 500m3/ h, gas speed is 10m/s, and suitable liquid measure is 0.3m3/ h, the external diameter of the plastics Pall ring filler in cross_flow rotating packed bed is 16mm, and the rotating speed of cross_flow rotating packed bed is 600r/min, and the liquid-gas ratio in cross_flow rotating packed bed is 0.2L/m3, the gas-phase pressure drop of cross_flow rotating packed bed is 150Pa, adds sodium lauryl sulphate and be configured to the foaming agent solution that mass concentration is 0.05% in water, and measured total efficiency of dust collection is 98.7%, wherein, and PM2.5Removal efficiency be 96%, PM1.0Removal efficiency be 89%.
Embodiment 2: produce in the production line of nitrophosphate fertilizer at certain, 200,000 m can be discharged3The gas containing composite chemical fertilizer dust of/h, dust granules is thin, and concentration is about 4g/m3. Carrying out pilot experiment as dusty gas, process tolerance is 800m3/ h, gas speed is 15m/s, and suitable liquid measure is 0.3m3/ h, the external diameter of the plastics Pall ring filler in cross_flow rotating packed bed is 35mm, and the rotating speed of cross_flow rotating packed bed is 500r/min, and the liquid-gas ratio in cross_flow rotating packed bed is 0.3L/m3, the gas-phase pressure drop of cross_flow rotating packed bed is 180Pa, adds the foaming agent solution that the surfactant formulatory of span series becomes mass concentration to be 0.01% in water, and measured total efficiency of dust collection is 99.5%, wherein, and PM2.5Removal efficiency be 97%, PM1.0Removal efficiency be 88.5%.
Embodiment 3: the Pulvis Talci simulated concentration using 2000 orders is 15g/m3Dusty gas, process tolerance is 600m3/ h, the gas speed passing into cross_flow rotating packed bed is 20m/s, and suitable liquid measure is 0.15m3/ h, the external diameter of the plastics Pall ring filler in cross_flow rotating packed bed is 50mm, and the rotating speed of cross_flow rotating packed bed is 400r/min, and the liquid-gas ratio in cross_flow rotating packed bed is 0.4L/m3, the gas-phase pressure drop of cross_flow rotating packed bed is 200Pa, and the wetting agent adding tween series in water is configured to the foaming agent solution that mass concentration is 0.1%, and measured total efficiency of dust collection is 99.7%, wherein, and PM2.5Removal efficiency be 98%, PM1.0Removal efficiency be 90%.
Claims (7)
1. the device of fine particle in a hypergravity elimination gas, including the cross_flow rotating packed bed (1) being provided with gas inlet and outlet and liquid entrance, the gas feed (1.1) of cross_flow rotating packed bed (1) connects dust-laden source of the gas (3) by vortex-shedding meter (2), liquid-inlet (1.2) connects reservoir (5) by liquid pump (4), liquid outlet (1.3) connects reservoir (5) by U-shaped liquid seal device (6), it is characterized in that: the gas feed (1.1) of described cross_flow rotating packed bed (1) is tangentially-arranged in cross_flow rotating packed bed (1) hull outside, gas feed (1.1) place installs back-shaped water conservancy diversion inlet plate (7), packing layer (1.4) it is provided with in cross_flow rotating packed bed (1), the filler of packing layer (1.4) is plastics Pall ring filler.
2. the device of fine particle in a kind of hypergravity according to claim 1 elimination gas, it is characterized in that: described back-shaped water conservancy diversion inlet plate (7) is installed along gas feed (1.1) is alternately interspersed for baffle plate, back-shaped water conservancy diversion inlet plate (7) length is 1/3rd of gas feed (1.1) pipe diameter, and the width of back-shaped water conservancy diversion inlet plate (7) is 1/2nd of back-shaped water conservancy diversion inlet plate (7) length.
3. the device of fine particle in a kind of hypergravity according to claim 1 elimination gas, it is characterised in that: described plastics Pall ring filler surface is provided with matte embossing, and the external diameter of plastics Pall ring filler is 16-50mm.
4. the device of fine particle in a kind of hypergravity according to claim 1 elimination gas, it is characterised in that: described cross_flow rotating packed bed (1) is Cross-Flow Rotating Packed Bed.
5. utilize the device of fine particle in a kind of hypergravity elimination gas described in claim 1-3 to remove the method for fine particle in gas, it is characterized in that: specifically comprise the following steps that dusty gas from dust-laden source of the gas (3) after vortex-shedding meter (2), along back-shaped tangential entrance cross_flow rotating packed bed (1), reactant liquor in reservoir (5) is delivered to high-gravity rotating bed (1) by liquid pump (4), gas-liquid two-phase is in packing layer (1.4) haptoreaction, complete the fine particle in elimination gas, reacted liquid is discharged from liquid outlet (1.3), enter into after U-shaped liquid seal device (6) in reservoir (5) and recycle, the gas of elimination fine particle discharges cross_flow rotating packed bed (1) through gas outlet (1.5), reactant liquor in described reservoir (5) is mass concentration is the foaming agent solution of 0.01-0.1%, described in pass into the gas gas speed of cross_flow rotating packed bed (1) be 10 ~ 20m/s.
6. the method for fine particle in the device elimination gas utilizing fine particle in a kind of hypergravity elimination gas according to claim 4, it is characterized in that: the rotating speed of described cross_flow rotating packed bed is 400-600r/min, the gas-phase pressure drop of cross_flow rotating packed bed is 150-200Pa, and the liquid-gas ratio in cross_flow rotating packed bed is 0.2-0.4L/m3��
7. the method for fine particle in the device elimination gas utilizing fine particle in a kind of hypergravity elimination gas according to claim 4, it is characterized in that: the foaming agent solution in described reservoir is the surfactant and the wetting agent that add sodium lauryl sulphate, span series or tween series in water, is configured to the foaming agent solution that mass fraction is 0.01% ~ 0.1%.
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| CN113109222A (en) * | 2021-03-08 | 2021-07-13 | 唐山科技职业技术学院 | Method for evaluating comprehensive performance of supergravity rotating packed bed |
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| CN113109222A (en) * | 2021-03-08 | 2021-07-13 | 唐山科技职业技术学院 | Method for evaluating comprehensive performance of supergravity rotating packed bed |
| CN113231210A (en) * | 2021-06-01 | 2021-08-10 | 珠海力新环保有限公司 | Supergravity separation equipment |
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| CN105642062B (en) | 2018-06-26 |
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