CN204352703U - For the high efficiency cooling dust arrester of nano-powder industry - Google Patents
For the high efficiency cooling dust arrester of nano-powder industry Download PDFInfo
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- CN204352703U CN204352703U CN201420814343.7U CN201420814343U CN204352703U CN 204352703 U CN204352703 U CN 204352703U CN 201420814343 U CN201420814343 U CN 201420814343U CN 204352703 U CN204352703 U CN 204352703U
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Abstract
The utility model discloses a kind of high efficiency cooling dust arrester for nano-powder industry, comprise Venturi scrubbing device, collecting tank and be socketed in the chuck cooling device of hull outside of described Venturi scrubbing device; Described chuck cooling device is used for passing through cooling circulating water; Wherein, described Venturi scrubbing device comprises venturi tube and is positioned at the Venturi scrubbing spray equipment on venturi tube top and is positioned at the secondary spraying device of venturi tube bottom; The bottom of described Venturi scrubbing device is communicated with described collecting tank by connecting pipe; Described collecting tank is separated rear gas-liquid mixture for collecting cooling and dedusting.This is used for the high efficiency cooling dust arrester of nano-powder industry, and device structure is simple, easily safeguards.Not only can carry out abundant cooling, purifying to nano-powder, reduce the possibility of equipment blocking, and udst separation Be very effective.
Description
Technical field
The utility model relates to fine inorganic chemicals processing equipment technical field, particularly relates to the high efficiency cooling dust arrester for nano-powder industry.
Background technology
In fine inorganic chemicals technology field, the fumed nano powder synthesized by metal chloride pyrohydrolysis is more typically had: fumed silica, fumed titanium dioxide, and wherein fumed silica is widely used in the product scope such as silicon rubber, adhesive; Fumed titanium dioxide is as a kind of efficient, nontoxic photochemical catalyst, and in field of Environment Protection, its antiseptic is widely used.
The fumed nano powder synthesized by metal chloride creates a large amount of HCl gas (sour gas) in gas-phase combustion preparation process, due to the particularity of nano-powder, even if by after the equipment such as fluid bed, cyclone dust collectors, except containing except a large amount of HC1 gas in synthesis tail gas, also a lot of fumed nano powder can be contained.Therefore, the nano-powder how removed in tail gas to become in the preparation process of vapor phase method synthesis of nano powder a problem being very difficult to solve.
The solid particle device removed in Chemical Manufacture in tail gas is subject to the attention of people always very much, relatively common are gas solid separation, solid-liquor separation, because nano-powder belongs to the nanometer grade powder that specific area is large, density is little, the dust removing effects of its conventional dust removal equipment is always bad, carried by tail gas that to enter follow-up wet dedusting operation be inevitable, and this tail gas containing nano-powder not only temperature is high, also containing hydrogen chloride gas; Its corrosivity in wet dedusting of hydrogen chloride gas is very strong, usually can corrode cleaner.
All the time, wet dedusting cooling technology is just only confined to tail gas desulfurization, boiler flue dedusting etc., although the form of deduster is various, mainly includes the various wet scrubbers such as packed tower, plate column, venturi tower; But never a kind of device being applicable to the nano-powder removed in high temperature corrosion gas.Wherein, packed tower, plate column is very easily stifled tower in this tail gas process of process, and its cooling can only be undertaken by the liquid of spray, be unfavorable for consecutive production, shaped Venturi dedusting tower overcomes this shortcoming of stifled tower, but its cooling performance and packed tower, plate column is the same, the temperature of tail gas can not be effectively reduced, after the cooling of these dedusters, the temperature of tower Inner eycle liquid can reach 80-90 DEG C, high temperature like this not only requires to uprise to the equipment of wet scrubber and coupled pipe material, and hydrochloric acid is produced to follow-up hydrogen chloride absorption also create very large side effect, its hydrogen chloride solubility step-down is caused to have a strong impact on the concentration of hydrochloric acid, this phenomenon is particularly serious in summer.
Therefore, the above-mentioned technological deficiency how overcoming cleaner of the prior art is those skilled in the art's technical problems urgently to be resolved hurrily.
Utility model content
The utility model, for solving the deficiencies in the prior art, provides a kind of except the fumed nano powder high-effective dust-removing cooling device that nano-powder performance is good, temperature reduction performance is good, efficiency is high, energy consumption is low, cost is low, duration of service is long.
Above-mentioned purpose of the present utility model is achieved by the following technical programs:
The utility model provides a kind of high efficiency cooling dust arrester for nano-powder industry,
Comprise Venturi scrubbing device (2), collecting tank (7) and be socketed in the chuck cooling device (1) of hull outside of described Venturi scrubbing device (2); Described chuck cooling device (1) is for passing through cooling circulating water;
Wherein, described Venturi scrubbing device (2) comprises venturi tube and is positioned at the Venturi scrubbing spray equipment (4) on venturi tube top and is positioned at the secondary spraying device (6) of venturi tube bottom; The bottom of described Venturi scrubbing device (2) is communicated with described collecting tank (7) by connecting pipe;
Described collecting tank (7) is separated rear gas-liquid mixture for collecting cooling and dedusting.
Preferably, as a kind of embodiment, the housing exterior walls along described Venturi scrubbing device (2) in described chuck cooling device (1) is disposed with multiple deflector (3) from top to bottom.
Preferably, as a kind of embodiment, described venturi tube comprises the entrance, contraction section, trunnion and the diffuser that are communicated with successively; Described entrance, described contraction section, described trunnion are communicated with successively with described diffuser.
Preferably, as a kind of embodiment, described Venturi scrubbing spray equipment (4) comprises hydrojet pipeline and is arranged on the spray head in the middle of described hydrojet pipeline.
Preferably, as a kind of embodiment, described secondary spraying device (6) comprises hydrojet pipeline and is arranged on the multiple spray heads on described hydrojet pipeline; In multiple spray head, one is positioned at the centre of described Venturi scrubbing device (2), and all the other multiple spray head uniform intervals are along the circumferential direction distributed in around middle spray head.
Preferably, as a kind of embodiment, the spray head in described secondary spraying device (6) is spiral tetrafluoro shower nozzle.
Preferably, as a kind of embodiment, the crown center position of the housing of described Venturi scrubbing device (2) is provided with containing nano-powder inlet exhaust gas (C); The bottom sidewall of the housing of described Venturi scrubbing device is also provided with offgas outlet (D).
Preferably, as a kind of embodiment, the top position of the housing of described Venturi scrubbing device is respectively arranged with washing mouth (A) and washing mouth (B).
Preferably, as a kind of embodiment, the middle part sidewall of the housing of described Venturi scrubbing device (2) is also provided with manhole.
Preferably, as a kind of embodiment, be describedly copper structural member for the described chuck cooling device (1) in the high efficiency cooling dust arrester structure of nano-powder industry, described Venturi scrubbing device (2), described collecting tank (7).
Compared with prior art, the advantage of the utility model embodiment is:
The utility model provides a kind of high efficiency cooling dust arrester for nano-powder industry, and the structure analyzing the above-mentioned high efficiency cooling dust arrester for nano-powder industry is known: for the high efficiency cooling dust arrester of nano-powder industry primarily of Venturi scrubbing device, collecting tank and the structure such as the chuck cooling device composition of hull outside being socketed in described Venturi scrubbing device; In the schematic views in particular: chuck cooling device wherein built with cooling fluid (such as cooling water), and is implemented to cool to the Venturi scrubbing device be socketed in chuck cooling device by the cooling water of circulation.The temperature in spray column can be made by being down to lower temperature range by the cooling of recirculated water.The device of Venturi scrubbing is simultaneously divided into two-layer up and down, upper strata Venturi scrubbing spray equipment, lower floor is secondary spraying device, Venturi scrubbing spray equipment in upper strata can form water membrane after implementing spray, gas-solid phase is fully mixed with liquid phase, can ensure that the solid in tail gas is soaked uniformly and effectively like this, nano-powder after wetting becomes oarse-grained solid, and in secondary spray process, (after namely secondary spraying device is implemented) can well be sprayed in the collecting tank that traps and flow into deduster bottom.
In sum, the high efficiency cooling dust arrester for nano-powder industry that the utility model embodiment provides, not only can make the abundant cooling, purifying of nano-powder tail gas, and reaches discharge standard by more clean for the tail gas after purification; Liquid immixture can be promoted especially by venturi spray equipment and secondary spraying device, add gas-liquid contact surface, improve mass-transfer efficiency, greatly improve dust removing effects, reduce the possibility of equipment blocking.And high efficiency cooling dust arrester has high abrasion, high life and etch-proof advantage, there is again the reliability used continuously.
Therefore, high-effective dust-removing cooling device in the utility model embodiment, fully demonstrate the power of the dedusting cooler of a tower multiple-effect, udst separation Be very effective, especially to raw materials used be metal halide (based on chloride), and at a certain temperature, participate in the vent gas treatment successful of chemical reactive synthesis nano-powder with gaseous state.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model detailed description of the invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in detailed description of the invention or description of the prior art below, apparently, accompanying drawing in the following describes is embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
The structural profile schematic diagram of the high efficiency cooling dust arrester for nano-powder industry that Fig. 1 provides for the utility model embodiment;
In figure:
1-chuck cooling device; 2-Venturi scrubbing device; 3-deflector; 4-Venturi scrubbing spray equipment; 5-trunnion; 6-secondary spraying device; 7-collecting tank; A-washs mouth; B-washs mouth; C-inlet exhaust gas; D-offgas outlet.
Detailed description of the invention
Be clearly and completely described the technical solution of the utility model below in conjunction with accompanying drawing, obviously, described embodiment is the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
Also by reference to the accompanying drawings the utility model is described in further detail below by specific embodiment.
As shown in Figure 1, a kind of high efficiency cooling dust arrester for nano-powder industry that the utility model embodiment provides, comprises Venturi scrubbing device 2, collecting tank 7 and is socketed in the chuck cooling device 1 of hull outside of described Venturi scrubbing device 2; Described chuck cooling device 1 is for passing through cooling circulating water;
It has following position relationship and connected mode and specifically constructs: wherein, described Venturi scrubbing device 2 comprises venturi tube and is positioned at the Venturi scrubbing spray equipment 4 on venturi tube top and is positioned at the secondary spraying device 6 of venturi tube bottom; The bottom of described Venturi scrubbing device is communicated with described collecting tank 7 by connecting pipe; Described collecting tank 7 is separated rear gas-liquid mixture for collecting cooling and dedusting.
Wherein, the housing exterior walls along described Venturi scrubbing device in described chuck cooling device is disposed with multiple deflector 3 from top to bottom.Meanwhile, chuck cooling device wherein built with cooling fluid (such as cooling water), and is implemented to cool to the Venturi scrubbing device be socketed in chuck cooling device by the cooling water of circulation.The layout of deflector can increase the stroke of recirculated cooling water, increases its atomizing effect, and ensures that recirculated water implements cooling effect to Venturi scrubbing device fully.
In concrete syndeton, the crown center position of the housing of described Venturi scrubbing device 2 is provided with containing nano-powder inlet exhaust gas C, and the bottom sidewall of the housing of described Venturi scrubbing device 2 is also provided with offgas outlet D.The top position of the housing of described Venturi scrubbing device 2 is respectively arranged with washing mouth A and washing mouth B.Dust remover roof is also provided with two washing mouths A, B, hangs over the equipment on wall in purge column.
The concrete structure analyzing the above-mentioned high efficiency cooling dust arrester for nano-powder industry is known: chuck cooling device wherein built with cooling fluid (such as cooling water), and is implemented to cool to the Venturi scrubbing device be socketed in chuck cooling device by the cooling water of circulation.The temperature in spray column can be made to be down to about 40 DEG C by 80-90 DEG C by the cooling of recirculated water.The device of Venturi scrubbing is simultaneously divided into two-layer up and down, upper strata Venturi scrubbing spray equipment, lower floor is secondary spraying device, Venturi scrubbing spray equipment in upper strata can form water membrane after implementing spray, gas-solid phase is fully mixed with liquid phase, can ensure that the solid in tail gas is soaked uniformly and effectively like this, nano-powder after wetting becomes oarse-grained solid, and in secondary spray process, (after namely secondary spraying device is implemented) can well be sprayed in the collecting tank that traps and flow into deduster bottom.
The high efficiency cooling dust arrester for nano-powder industry that the utility model embodiment provides can implement the operation of the process such as dedusting, purification, separation, cooling.When containing nano-powder tail gas after the crown center position of the housing of Venturi scrubbing device 2 is provided with and enters containing nano-powder inlet exhaust gas C, successively to enter Venturi scrubbing spray equipment 4 and be positioned at the secondary spraying device 6 of venturi tube bottom, after the washing of once washing liquid, the dust entered in the venturi tube air-flow of bottom to be dispersed on inwall and to contact inwall and accepts cooling, again through secondary washing after fully contacting cooling, then tail gas is discharged from the offgas outlet D of device bottom; Liquid after washing, purifying enters collecting tank 7.Described collecting tank 7 is separated rear gas-liquid mixture, in addition solid slag periodic exhaustion for collecting cooling and dedusting.
Find after deliberation, the fumed nano powder high-effective dust-removing cooling device provided by the utility model, the dust removal efficiency of the tail gas of fumed nano powder can be made to reach 99.9%, and temperature is reduced to about 40 DEG C.
Below the concrete structure of the high efficiency cooling dust arrester for nano-powder industry that the utility model embodiment provides is done and describes in detail:
Wherein, described Venturi scrubbing spray equipment 4 (i.e. fountain Venturi scrubber) comprises hydrojet pipeline and is arranged on the spray head in the middle of described hydrojet pipeline.
Described secondary spraying device 6 comprises hydrojet pipeline and is arranged on the multiple spray heads on described hydrojet pipeline; In multiple spray head, one is positioned at the centre of described Venturi scrubbing device, and all the other multiple spray head uniform intervals are along the circumferential direction distributed in around middle spray head.
Particularly, the spray head in described secondary spraying device 6 is spiral tetrafluoro shower nozzle.
It should be noted that, Venturi scrubbing device 2, venturi tube, secondary spraying device 6 and collecting tank 7 set gradually and through from top to bottom; In concrete structure: described Venturi scrubbing device 2 for spraying atomization cleaning solution and fully mixing with exhaust gas, and is introduced to venturi tube; Described venturi tube is for the liquid-vapor mixture washing liquid and tail gas, and abundant contact mixing mass transfer enters collecting tank 7 again and collects, and after cleaning, tail gas is discharged; Wherein in Venturi scrubbing spray equipment 4, secondary spraying device 6, multiple spray head is uniformly distributed, and can guarantee to implement spraying effect better, and after spray, cleaning solution surface flowing can form liquid film, implements gas-liquid Homogeneous phase mixing to through exhaust gas.This distribution mode structure can process the vent gas treatment of the air scale of construction simultaneously, and can ensure the sprinkle density in tower.
As a kind of preferred embodiment, above-mentioned venturi tube comprises the entrance, contraction section, trunnion and the diffuser that are communicated with successively.
In concrete structure, described Venturi scrubbing spray equipment is injecting type Venturi scrubber.Wherein the of paramount importance parts of this structure are venturi tubes: described venturi tube comprises the entrance, contraction section, trunnion (i.e. venturi) and the diffuser that are communicated with successively.It should be noted that, Venturi scrubber (injecting type Venturi scrubber) carries out dedusting to wash one of most economical method.Cleaning solution is atomized into fine drop by Venturi scrubber, because the relative velocity between gas and drop is very high, so arresting efficiency is also very high.Venturi scrubber only needs little maintenance and maintenance.The principle of venturi tube is exactly air-flow cavity from the coarse to fine, and to accelerate gas flow rate, the fastest through trunnion place air velocity, then enter the at this moment a large amount of enrichment of gas flow of expanding section subsequently spreads, and can carry out contact mixing fully to the cleaning solution introduced.This cleaning solution drop just obviously improving atomization shape is to the trapping effect of nano-powder tail gas.In addition, the size of its trapping effect also with the shape of the contraction section and anemostat etc. of venturi tube, latus rectum and relevant position relevant with factors such as bleed pressure sizes, this utility model embodiment is repeated no longer one by one.In addition, in device in venturi showering washing device 4, the design of trunnion 5 is particularly crucial, will calculate the size of accurate trunnion size and converging transition and expanding reach according to gas gauge.
Find through research, Venturi scrubber can be widely used in, the control of the industry Large Diameter Pipeline fluids such as oil, chemical industry, metallurgy, electric power and metering.It has following technical advantage: the resistance that (1) produces fluid is little, and about 150Pa therefore energy consumption is low.(2) scope of application is wide, and general gas flow, flue gas, impure more blast furnace gas etc., Long-Time Service is blockage phenomenon not.(3) easy for installation, be convenient to long-term maintenance.
Wherein, as a kind of embodiment, the middle part sidewall of the housing of described Venturi scrubbing device 2 is also provided with manhole.
In addition, the inwall of described housing is also provided with wear resistant corrosion resistant layer.
In addition, describedly copper structural member is for the described chuck cooling device 1 in the high efficiency cooling dust arrester structure of nano-powder industry, described Venturi scrubbing device 2, described collecting tank 7.
It should be noted that, inner walls scribbles wear resistant corrosion resistant layer, containing sour gas such as a large amount of HCI in nano-powder tail gas, is corrosive to inner walls, and enclosure interior contributes to the service life of raising equipment after increasing wear resistant corrosion resistant layer.In addition, high-effective dust-removing cooling device is made up of metallic copper, and solving other materials can not the performance of simultaneously corrosion-and high-temp-resistant, solves the shortcoming of other corrosion resistant material poor thermal conductivity simultaneously, and reduced the rank of connecting tube by the cooling-down effect of this equipment, save cost greatly.
In sum, the high efficiency cooling dust arrester for nano-powder industry that the utility model embodiment provides, not only can make the abundant cooling, purifying of nano-powder tail gas, and reaches discharge standard by more clean for the tail gas after purification; Liquid immixture can be promoted especially by venturi spray equipment and secondary spraying device, add gas-liquid contact surface, improve mass-transfer efficiency, greatly improve dust removing effects, reduce the possibility of equipment blocking.And high efficiency cooling dust arrester has high abrasion, high life and etch-proof advantage, there is again the reliability used continuously.Therefore, high-effective dust-removing cooling device in the utility model embodiment, fully demonstrate the power of the dedusting cooler of a tower multiple-effect, udst separation Be very effective, especially to raw materials used be metal halide (based on chloride), and at a certain temperature, participate in the vent gas treatment successful of chemical reactive synthesis nano-powder with gaseous state.
Last it is noted that above each embodiment is only in order to illustrate the technical solution of the utility model, be not intended to limit; Although be described in detail the utility model with reference to foregoing embodiments, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein some or all of technical characteristic; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of each embodiment technical scheme of the utility model.
Claims (10)
1., for a high efficiency cooling dust arrester for nano-powder industry, it is characterized in that,
Comprise Venturi scrubbing device (2), collecting tank (7) and be socketed in the chuck cooling device (1) of hull outside of described Venturi scrubbing device (2); Described chuck cooling device (1) is for passing through cooling circulating water;
Wherein, described Venturi scrubbing device (2) comprises venturi tube and is positioned at the Venturi scrubbing spray equipment (4) on venturi tube top and is positioned at the secondary spraying device (6) of venturi tube bottom; The bottom of described Venturi scrubbing device (2) is communicated with described collecting tank (7) by connecting pipe;
Described collecting tank (7) is separated rear gas-liquid mixture for collecting cooling and dedusting.
2., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
Housing exterior walls along described Venturi scrubbing device (2) in described chuck cooling device (1) is disposed with multiple deflector (3) from top to bottom.
3., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
Described venturi tube comprises the entrance, contraction section, trunnion and the diffuser that are communicated with successively; Described entrance, described contraction section, described trunnion are communicated with successively with described diffuser.
4., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
Described Venturi scrubbing spray equipment (4) comprises hydrojet pipeline and is arranged on the spray head in the middle of described hydrojet pipeline.
5., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
Described secondary spraying device (6) comprises hydrojet pipeline and is arranged on the multiple spray heads on described hydrojet pipeline; In multiple spray head, one is positioned at the centre of described Venturi scrubbing device (2), and all the other multiple spray head uniform intervals are along the circumferential direction distributed in around middle spray head.
6., as claimed in claim 5 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
Spray head in described secondary spraying device (6) is spiral tetrafluoro shower nozzle.
7., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
The crown center position of the housing of described Venturi scrubbing device (2) is provided with containing nano-powder inlet exhaust gas (C); The bottom sidewall of the housing of described Venturi scrubbing device is also provided with offgas outlet (D).
8., as claimed in claim 7 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
The top position of the housing of described Venturi scrubbing device is respectively arranged with washing mouth (A) and washing mouth (B).
9., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
The middle part sidewall of the housing of described Venturi scrubbing device (2) is also provided with manhole.
10., as claimed in claim 1 for the high efficiency cooling dust arrester of nano-powder industry, it is characterized in that,
Describedly be copper structural member for the described chuck cooling device (1) in the high efficiency cooling dust arrester structure of nano-powder industry, described Venturi scrubbing device (2), described collecting tank (7).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420814343.7U CN204352703U (en) | 2014-12-20 | 2014-12-20 | For the high efficiency cooling dust arrester of nano-powder industry |
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| CN201420814343.7U CN204352703U (en) | 2014-12-20 | 2014-12-20 | For the high efficiency cooling dust arrester of nano-powder industry |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892965A (en) * | 2017-12-12 | 2018-04-10 | 长春三真实业有限公司 | Greasy filth pollutant carries out the purification ＆ isolation device of caused natural gas in pyrolytic process |
| CN108159807A (en) * | 2017-12-29 | 2018-06-15 | 南京理工大学 | A kind of dust removal method and device that nanometer grit is captured using moist steam condensation phenomenon |
| CN111521038A (en) * | 2020-04-24 | 2020-08-11 | 西安交通大学 | Spiral winding type quencher for supercritical hydrothermal synthesis of nano powder |
| CN114432821A (en) * | 2022-03-08 | 2022-05-06 | 广东长信精密设备有限公司 | Recovery system of tail gas containing particulate matters |
| WO2023123633A1 (en) * | 2021-12-31 | 2023-07-06 | 江苏格陵兰传热科技有限公司 | High-efficiency composite cooler employing forced and induced draft fan without water spraying |
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2014
- 2014-12-20 CN CN201420814343.7U patent/CN204352703U/en active Active
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107892965A (en) * | 2017-12-12 | 2018-04-10 | 长春三真实业有限公司 | Greasy filth pollutant carries out the purification ＆ isolation device of caused natural gas in pyrolytic process |
| CN108159807A (en) * | 2017-12-29 | 2018-06-15 | 南京理工大学 | A kind of dust removal method and device that nanometer grit is captured using moist steam condensation phenomenon |
| CN111521038A (en) * | 2020-04-24 | 2020-08-11 | 西安交通大学 | Spiral winding type quencher for supercritical hydrothermal synthesis of nano powder |
| WO2023123633A1 (en) * | 2021-12-31 | 2023-07-06 | 江苏格陵兰传热科技有限公司 | High-efficiency composite cooler employing forced and induced draft fan without water spraying |
| CN114432821A (en) * | 2022-03-08 | 2022-05-06 | 广东长信精密设备有限公司 | Recovery system of tail gas containing particulate matters |
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