CN101239268A - Method and device for recovering dust of urea granulation - Google Patents
Method and device for recovering dust of urea granulation Download PDFInfo
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- CN101239268A CN101239268A CNA2008100198905A CN200810019890A CN101239268A CN 101239268 A CN101239268 A CN 101239268A CN A2008100198905 A CNA2008100198905 A CN A2008100198905A CN 200810019890 A CN200810019890 A CN 200810019890A CN 101239268 A CN101239268 A CN 101239268A
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- 239000000428 dust Substances 0.000 title claims abstract description 60
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 title claims abstract description 48
- 239000004202 carbamide Substances 0.000 title claims abstract description 27
- 238000000034 method Methods 0.000 title claims abstract description 24
- 238000005469 granulation Methods 0.000 title claims description 54
- 230000003179 granulation Effects 0.000 title claims description 54
- 238000010521 absorption reaction Methods 0.000 claims abstract description 48
- 239000007788 liquid Substances 0.000 claims abstract description 39
- 239000012530 fluid Substances 0.000 claims abstract description 15
- 238000001816 cooling Methods 0.000 claims abstract description 12
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 230000008569 process Effects 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000000945 filler Substances 0.000 claims description 7
- 230000004888 barrier function Effects 0.000 claims description 6
- 230000008676 import Effects 0.000 claims description 6
- 239000006096 absorbing agent Substances 0.000 claims description 4
- 238000007599 discharging Methods 0.000 abstract description 4
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000001704 evaporation Methods 0.000 abstract description 4
- 238000004064 recycling Methods 0.000 abstract 3
- 238000009408 flooring Methods 0.000 abstract 1
- 230000001360 synchronised effect Effects 0.000 abstract 1
- 235000013877 carbamide Nutrition 0.000 description 21
- 230000000694 effects Effects 0.000 description 13
- 241000282326 Felis catus Species 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000000926 separation method Methods 0.000 description 5
- 230000008901 benefit Effects 0.000 description 3
- 230000008020 evaporation Effects 0.000 description 3
- 230000004927 fusion Effects 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000005507 spraying Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 238000009423 ventilation Methods 0.000 description 2
- 101000860173 Myxococcus xanthus C-factor Proteins 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000004087 circulation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000010408 sweeping Methods 0.000 description 1
- 230000009897 systematic effect Effects 0.000 description 1
- 210000002700 urine Anatomy 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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- Treating Waste Gases (AREA)
Abstract
The present invention provides a dust recycling method and apparatus of urea prilling, the recovery method is synchronous recycling prilling dust and cooling dust when a water absorption liquid processes closed-circuit in multiple system or series connected system set in the prilling tower top device (I) and the flooring device (II). A multilevel nozzle is set in the device I and the device II, dust is absorbed respectively by atomizing water, the absorption liquid absorbs prilling dust and then returns to the fluid storage tank (5) in the device I, and cycled to the device I after absorbing cooling dust by potential difference in the device II. A gas distributed device and a gas-liquid separating device, pumps (15, 11) are respectively set in the device I and the device II to cycle, when the concentration of urea in absorption fluid is >/= 25%, the absorption fluid is transferred to the steam evaporating system to recycling urea. The method and device recycle the prilling dust and the cooling dust at the same time, not only improve the super quality efficiency of the product, but also the discharging tail gas keep with the national environmental protection standards.
Description
One, technical field
The present invention relates to chemical field dust recovery method and device, specifically a kind of dust of urea granulation recovery method and device.
Two, background technology
Carbamide granulation is the granulation of lowering the temperature in granulation tower of the urea of fusion, promptly solidifies granulating with the cold air heat exchange of sending at the bottom of the tower, and so-called cold air is for the urea of fusion.Air-flow heats up gradually in uphill process and is sweeping along dust to discharge from cat head, and the thermograde at the bottom of the tower and between the cat head forms thermal head has the natural air exhaust effect to promote the effect of air-flow ascension.The particle of moulding send fluid bed cooling cooling after vibrosieve is grade packaged.So-called dust of urea granulation is meant the dust that the dust that forms and fluid bed form when cooling when the granulation tower granulation.Dust of urea granulation or urea if do not reclaim, are not only loss and waste, and directly endanger plant area's greening health and carry out production strictly in line with rules and regulations and worker healthy, and contaminated environment.Dust of urea granulation has been included into one of necessary environmental protection project of administering of country at present.Mostly existing recovery method is individual event, promptly reclaims separately at granulation tower or fluid bed setting device.At present discharging standards is≤30mg/m3, the discharging gas of not going up device for recovering powder is generally equal 〉=and 100mg/m3.
Three, summary of the invention
The present invention aims to provide a kind of method and corresponding device thereof that reclaims dust of urea granulation, and the dust that forms when dust that technical problem to be solved forms when being the granulation tower granulation and fluid bed cooling cooling reclaims synchronously.Being convenient narration, is granulation dust and cooled dust with the dust of calling this two places formation in the following text.
Be the purpose that realizes reclaiming synchronously, thinking of the present invention is to use the wet dust removal method, promptly be the atomizing absorption process of absorption liquid with original production desorb or hydrolyzed waste water, by absorption liquid in two closed cycles of cover in the retracting devices to reclaim granulation dust and cooled dust simultaneously.So-called two cover retracting devices are meant that one is set on the atomizing absorber that the granulation tower top is used for reclaiming the granulation dust, call device (I) in the following text, another set ofly are arranged on the atomizing absorption tower that ground is used for reclaiming cooled dust, call device (II) in the following text.
The technical scheme of this recovery method is to be the atomizing absorption process of absorption liquid (abbreviation absorption liquid down) with original production desorb or hydrolyzed waste water, difference with the prior art be granulation dust and cooled dust by absorption liquid at two cover atomizing retracting devices (I) and (II) closed cycle reclaim described closed cycle or be parallel closed cycle or be the tandem closed cycle synchronously.
Described parallel closed cycle is that the absorption liquid from hopper 5 divides two-way, leads up to pump 15 and heating to be sent to device (I), is back to the hopper 5 that is positioned at the granulation tower top after absorbing the granulation dust; Another road absorption liquid is sent to device (II) by potential difference, sends tower body 10 back to or/and be sent to device (I) by pump 11 after absorbing cooled dust, is back to hopper 5 after absorbing the granulation dust once more.As shown in Figure 1.
Described tandem closed cycle is that the absorption liquid from hopper 5 at first is sent to device (II) by potential difference, is sent to device (I) by pump 11 after absorbing cooled dust, is back to hopper 5 after absorbing the granulation dust.
The purpose of absorption liquid heating is the thermograde of keeping in the granulation tower, prevents the loss of thermal head, and this just requires the temperature of absorption liquid to adapt with the temperature of granulation cat head, sets the temperature of absorption liquid in other words according to the temperature of granulation cat head.
The employed device of this recovery method comprises device (I) and device (II), device (I) is arranged on the atomizing absorber that is used for absorbing the granulation dust at granulation tower 1 top, comprise absorbing tube 2, distribution device in gas-fluid 3, collecting tank 4 and hopper 5, as shown in Figure 2.Absorb tube 2 tops that are positioned at granulation tower 1 effect of increasing tower body is arranged, be provided with at least three grades of nozzle 6a, 6b and 6c that stagger mutually in it, its effect is to form at least three layers of atomizing layer to absorb the granulation dust with the absorption liquid atomizing and in the cross-wise direction that absorbs tube 2, stagger mutually be meant that nozzle axially staggers up and down each other and about radially stagger, the atomized liquid of condensation flows into hoppers 5 through collecting tank 4; Distribution device in gas-fluid 3, collecting tank 4 and hopper 5 embed in the top of granulation tower 1, and the air-flow of rising flows to cat head via venetian blind type distribution device in gas-fluid 3; From absorption liquid that hopper 5 flows out or be connected in parallel on device (I) and device (II) on, perhaps be connected on device (II) and install on (I).
Be provided with the vane type demist plate 7 of gas-liquid separation effect at nozzle 6a and 6b, as shown in Figure 5, between nozzle 6b and 6c, be provided with the vertical honeycomb barrier filler 8 of gas-liquid separation effect, as shown in Figure 6.
Also upwards be provided with except that (spraying downwards) is set downwards between nozzle 6b and the 6c (upwards spraying), a density that increases atomizing layer is with abundant absorption dust, and two have the effect of flushing filler.
Be provided with filter 9 in the exit of hopper 5, to remove non-water soluble impurity in the absorption liquid.
Device (II) is arranged on the atomizing absorption tower that is used for absorbing cooled dust on the ground, comprise tower body 10, pump 11 and air-introduced machine 12, in tower body 10, be provided with at least three grades of nozzle 6d, 6e that stagger mutually and 6f and gas panel 13 and demister 14, as shown in Figure 3.The effect of nozzle 6d, 6e and 6f be will send here by potential difference the absorption liquid atomizing form the atomizing section absorbing cooled dust, the atomized drop flocking settling is sent tower body 10 back to or/and be sent to device (I) by pump 11 at the bottom of the tower; Distribution of air flow dish 13 prevents the air-flow that contains cooled dust short circuit under the effect of air-introduced machine 12 that Zi Tadi enters, and its structure as shown in Figure 7; Demister 14 plays the gas-liquid separation effect, and its structure as shown in Figure 8; The outlet of air-introduced machine 12 or emptying or be connected with the bottom of granulation tower 1 are for granulation tower 1 provides cooling blast.
Nozzle 6d, 6e and 6f also upwards are provided with except that being provided with downwards.
Below tower body 10 atomizing sections, be provided with the vertical honeycomb barrier filler 8 of gas-liquid separation effect.
When device (I) and device (II) parallel connection, the absorption liquid of process filter 9 divides two-way, is sent to device (I) after a route pump 15 and heater via 16 heating, and device (II) is sent to by potential difference in another road.Described heater 16 is for utilizing the tube still heater of steam or other thermals source.
When device (I) and device (II) series connection, the absorption liquid of process filter 9 directly is sent to device (II) by potential difference, sends tower body 10 back to or/and be sent to device (I) by pump 11 after the absorption cooled dust, to absorb the granulation dust.
The concentration of urea in the monitoring absorption liquid, when reach 〉=be sent to Urea Evaporation System to reclaim urea by pump 11 during 25% (wt), replenish new absorption liquid simultaneously.
The invention has the advantages that: device for recovering powder (I) and (II) place urea prilling tower top and ground respectively, device (I) adopts gravity-flow ventilation, resistance is low, need not add ventilation equipment, device (II) places ground, and easy and simple to handle and original production system is integrated, and equipment is few, reduced investment, effective; Absorption liquid fully utilizes mutually, and is effective.The air-introduced machine exit gas of device (II) is sent into the cooling air quantity that replenishes in the granulation tower in the tower, and total energy approach is good; Regularly be recovered to urine groove or vapo(u)rization system when circulating absorption solution reaches finite concentration, little to the original production systematic influence, it is obvious to reclaim benefit; Not only reclaim the carbamide dust in the tower overhead gas, make it reach state environmental emissioning standard, but also the dust in the finished urea is reclaimed, meet national requirements for environmental protection and improve finished product high-class product rate, bring considerable economic benefit etc.
Four, description of drawings
Fig. 1 is device (I) and (II) parallel closed cycle structure, schematic flow sheet.The urea of arrow A signal fusion is sent to the granulation process of granulation tower 1 among the figure; The outlet of arrow B signal air-introduced machine 12 or emptying or be connected with granulation tower 1 bottom; The outlet of arrow C signal pump 11 or is connected with tower body 10 or with install (I) nozzle 6a and be connected or be connected with Urea Evaporation System.
Fig. 2 is device (I) cross-sectional view, the flow direction of arrow signal absorption liquid among the figure.
Fig. 3 is device (II) cross-sectional view, the flow direction of arrow signal absorption liquid among the figure.
Fig. 4 is venetian blind type distribution device in gas-fluid 3 cross-sectional view.
Fig. 5 is the structural representation of vane type demist plate 7.
Fig. 6 is vertical honeycomb barrier filler 8 perspective view.
Fig. 7 is gas panel 13 structural representations.
Fig. 8 is demister 14 structural representations.
Five, the specific embodiment
Now with hydrolyzed waste water as absorption liquid the device (I) and (II) in parallel closed cycle be example, in conjunction with the accompanying drawings, non-limiting examples is described below:
1, device (I): as shown in Figure 1 and Figure 2, will absorb the top that tube 2 is fixed on granulation tower 1, be fixedly connected sequentially below it distribution device in gas-fluid 3 and collecting tank 4, collecting tank 4 is connected with hopper 5 by pipeline, and hopper 5 is fixed on the carbamide granulation structure of an essay 17.
Spiral clog-free spraynozzle 6a, 6b and 6c that three grades of atomizings absorb dust are set in absorbing tube 2, and wherein 6b and 6c spray up and down; Vane type demist plate 7 as shown in Figure 5 is set below nozzle 6a, vertical honeycomb barrier filler 8 as shown in Figure 6 is set between nozzle 6b and 6c.
The outlet of hopper 5 is connected with filter 9, the outlet one tunnel of filter 9 is connected with the import of pump 15, and the outlet of pump 15 is connected with heater 16, is sent to device (I) after absorption liquid is heated, promptly in parallel with nozzle 6a, 6b and 6c, be back to hopper 5 behind the absorption granulation dust; Another road is connected with device (II) by potential difference.
2, device (II): as Fig. 1, shown in Figure 3, ground is located on the atomizing absorption tower, the cooled dust air-flow that contains from cooling, packing department enters in the absorption tower behind distribution of air flow dish 13 in the import 18 from tower body 10 bottoms under the effect of air-introduced machine 12, the import of air-introduced machine 12 is connected with the outlet on the top of tower body 10, the outlet of air-introduced machine 12 or emptying or provide cold gas for granulation tower 1.
Spiral clog-free spraynozzle 6d, 6e and 6f that three grades of atomizings absorb dust are set in tower body 10, all upper and lower spraying, and in parallel with another road of filter 9 outlets; Be provided with distribution of air flow dish 13 as shown in Figure 7 in the bottom of tower body 10, its top is provided with vertical honeycomb barrier filler 8 as shown in Figure 6; Be provided with demister 14 as shown in Figure 8 at the top of tower body 10.
The absorption liquid of atomizing is deposited in tower body after absorbing dust, sends tower body 10 circulations back to by pump 11 and absorbs or/and be sent to device (I), reaches when absorbing urea 〉=be sent to Urea Evaporation System by pump 11 during 25% (wt).
The air-flow that is cleaned is through discharging from blow-down pipe under the effect of air-introduced machine 12 after the gas-liquid separation.
Claims (10)
1, a kind of dust of urea granulation recovery method, be to be the atomizing absorption process of absorption liquid with water, it is characterized in that: the dust quilt that forms during the cooling of the dust that forms during by the granulation tower granulation and fluid bed at two covering devices (I) and the water absorption liquid of doing closed cycle (II) reclaim synchronously, described device (I) is arranged on the atomizing absorber on granulation tower top, described device (II) is arranged on the atomizing absorption tower on ground, described closed cycle or be parallel closed cycle or for the tandem closed cycle.
2, recovery method according to claim 1, it is characterized in that: described parallel closed cycle is that the absorption liquid from the hopper that is arranged in the granulation tower top (5) divides two-way, the pump (15) of leading up to is sent to device (I), be back to hopper (5) after absorbing dust, device (II) is sent to by potential difference in another road, absorb behind the dust or and return tower body 10, be back to hopper (5) after absorbing dust once more or/and be sent to device (I) by pump (11).
3, recovery method according to claim 1, it is characterized in that: described tandem closed cycle is that the absorption liquid from the hopper that is arranged in the granulation tower top (5) is sent to device (II) by potential difference, be sent to device (I) by pump (11) after absorbing dust, be back to hopper (5) behind the absorption dust.
4, by the used device of the described a kind of dust of urea granulation recovery method of claim 1, formed by device (I) and device (II), it is characterized in that: described device (I) is arranged on the atomizing absorber at granulation tower (1) top, comprise and absorb tube (2) distribution device in gas-fluid (3), collecting tank (4) and hopper (5), absorb the top that tube (2) is positioned at granulation tower (1), be provided with at least three grades of nozzles that stagger mutually (6a), (6b) and (6c) in it; Distribution device in gas-fluid (3), collecting tank (4) and hopper (5) embed in the top of granulation tower (1); Described device (II) is arranged on the atomizing absorption tower on ground, comprise tower body (10), pump (11) and air-introduced machine (12), in tower body (10), be provided with at least three grades of nozzles that stagger mutually (6d), (6e) and (6f) and distribution of air flow dish (13) and demister (14); The import of pump (11) and tower body (10) bottom is connected, its outlet or be connected with tower body 10 or/and with install (I) nozzle 6a and be connected; The import of air-introduced machine (12) is connected with tower body (10) top, its outlet or emptying or be connected with granulation tower (1) bottom; From absorption liquid that hopper (5) flows out or be connected in parallel on device (I) and device (II) is gone up or is connected on device (II) and installs on (I).
5, device according to claim 4 is characterized in that: be provided with filter (9) in the exit of hopper (5).
6, device according to claim 4 is characterized in that: nozzle (6b), (6c), (6d), (6e) and (6f) upwards setting.
7, device according to claim 4, it is characterized in that: be provided with vane type demist plate (7) at nozzle (6a) with (6b), be respectively arranged with vertical honeycomb barrier filler (8) at nozzle (6b) with (6c) and between nozzle (6f) and the distribution of air flow dish (13).
8, according to claim 4 or 5 or 6 or 7 described devices, it is characterized in that: when device (I) and device (II) parallel connection, the outlet of filter (9) is connected with the import of pump (15), and the outlet of pump (15) is by heater (16) and the nozzle (6a) that installs (I), (6b) and (6c) in parallel; The outlet of filter (9) is also with nozzle (6d), (6e) and (6f) parallel connection of installing (II); The outlet of pump (11) is connected with nozzle 6a.
9, according to claim 4 or 5 or 6 or 7 described devices, it is characterized in that: when device (I) and device (II) series connection, the nozzle (6d) of the outlet of filter (9) and device (II), (6e) and (6f) in parallel, the nozzle (6a) of the outlet of pump (11) and device (I), (6b) and (6c) in parallel.
10, device according to claim 8 is characterized in that: described heater (16) is for utilizing the tube still heater of steam or other thermals source.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100198905A CN101239268B (en) | 2008-03-21 | 2008-03-21 | Method and device for recovering dust of urea granulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2008100198905A CN101239268B (en) | 2008-03-21 | 2008-03-21 | Method and device for recovering dust of urea granulation |
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| Publication Number | Publication Date |
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| CN101239268A true CN101239268A (en) | 2008-08-13 |
| CN101239268B CN101239268B (en) | 2011-05-18 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2008100198905A Expired - Fee Related CN101239268B (en) | 2008-03-21 | 2008-03-21 | Method and device for recovering dust of urea granulation |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350162A (en) * | 2011-07-22 | 2012-02-15 | 镇江市恒升达化工科技有限公司 | Tower top dust recovery device for urea granulation tower and recovery method for dust on top of urea granulation tower |
| CN104383790A (en) * | 2014-10-20 | 2015-03-04 | 安徽晋煤中能化工股份有限公司 | Technology for reducing noise and ammonia content generated during discharging process of CO2 stripping process urea device |
| CN107008084A (en) * | 2017-05-24 | 2017-08-04 | 镇江市恒升达化工科技有限公司 | A kind of dust collection box |
| CN107286058A (en) * | 2017-08-22 | 2017-10-24 | 四川金象赛瑞化工股份有限公司 | One section of evaporation control system of urea and method |
| CN107970716A (en) * | 2018-01-12 | 2018-05-01 | 西安同大科技有限公司 | Mechanical ventilation type tower top treating flour dust retracting device |
| CN107983057A (en) * | 2018-01-12 | 2018-05-04 | 西安同大科技有限公司 | A kind of ultra-clean urea granulation tower powder/dust reclaiming device |
| CN108355427A (en) * | 2018-04-19 | 2018-08-03 | 镇江市恒升达化工科技有限公司 | A kind of tower disc type device for recovering powder |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1185039C (en) * | 2002-07-23 | 2005-01-19 | 杨长明 | Wet type dual-collecting and fume purifying apparatus |
| CN201217653Y (en) * | 2008-03-21 | 2009-04-08 | 李洪林 | Urea granulation flour dust recovering device |
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2008
- 2008-03-21 CN CN2008100198905A patent/CN101239268B/en not_active Expired - Fee Related
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102350162A (en) * | 2011-07-22 | 2012-02-15 | 镇江市恒升达化工科技有限公司 | Tower top dust recovery device for urea granulation tower and recovery method for dust on top of urea granulation tower |
| CN104383790A (en) * | 2014-10-20 | 2015-03-04 | 安徽晋煤中能化工股份有限公司 | Technology for reducing noise and ammonia content generated during discharging process of CO2 stripping process urea device |
| CN107008084A (en) * | 2017-05-24 | 2017-08-04 | 镇江市恒升达化工科技有限公司 | A kind of dust collection box |
| CN107286058A (en) * | 2017-08-22 | 2017-10-24 | 四川金象赛瑞化工股份有限公司 | One section of evaporation control system of urea and method |
| CN107286058B (en) * | 2017-08-22 | 2023-04-18 | 四川金象赛瑞化工股份有限公司 | Urea first-stage evaporation control system and method |
| CN107970716A (en) * | 2018-01-12 | 2018-05-01 | 西安同大科技有限公司 | Mechanical ventilation type tower top treating flour dust retracting device |
| CN107983057A (en) * | 2018-01-12 | 2018-05-04 | 西安同大科技有限公司 | A kind of ultra-clean urea granulation tower powder/dust reclaiming device |
| CN108355427A (en) * | 2018-04-19 | 2018-08-03 | 镇江市恒升达化工科技有限公司 | A kind of tower disc type device for recovering powder |
Also Published As
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|---|---|
| CN101239268B (en) | 2011-05-18 |
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