CN101935081A - Pressure type air flotation separation device - Google Patents
Pressure type air flotation separation device Download PDFInfo
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- CN101935081A CN101935081A CN 201010290566 CN201010290566A CN101935081A CN 101935081 A CN101935081 A CN 101935081A CN 201010290566 CN201010290566 CN 201010290566 CN 201010290566 A CN201010290566 A CN 201010290566A CN 101935081 A CN101935081 A CN 101935081A
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- oil
- tank body
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- bubble
- pressure type
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- 238000000926 separation method Methods 0.000 title claims abstract description 50
- 238000005188 flotation Methods 0.000 title claims abstract description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 81
- 239000002893 slag Substances 0.000 claims description 14
- 238000012856 packing Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 2
- 239000007789 gas Substances 0.000 abstract description 16
- 230000000694 effects Effects 0.000 abstract description 6
- 239000002245 particle Substances 0.000 abstract description 3
- 230000004927 fusion Effects 0.000 abstract description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 16
- 238000000034 method Methods 0.000 description 12
- 239000000377 silicon dioxide Substances 0.000 description 8
- 238000002156 mixing Methods 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 241000024287 Areas Species 0.000 description 1
- 206010020852 Hypertonia Diseases 0.000 description 1
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005587 bubbling Effects 0.000 description 1
- 235000009508 confectionery Nutrition 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 239000000796 flavoring agent Substances 0.000 description 1
- 235000019634 flavors Nutrition 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- 239000007764 o/w emulsion Substances 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 239000002516 radical scavenger Substances 0.000 description 1
- 238000010992 reflux Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
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Abstract
The invention discloses a pressure type air flotation separation device, which comprises a tank body (1), and an oil collecting barrel (3) and an air bubble flow rectifying barrel (2) which are arranged in the tank body (1), wherein an air bubble flow rectifying area (A) of which the bottom is sealed is formed between the outer side wall of the air bubble flow rectifying barrel (2) and the inner side wall of the tank body (1); a flotation separation area (B) of which the bottom is open is formed between the inner side wall of the air bubble flow rectifying barrel (2) and the outer side wall of the oil collecting barrel (3); an oil-containing water inlet pipe (4) and a gas-dissolving water inlet pipe (5) are arranged on the tank body (1) tangentially; and a water discharge pipe (11) is arranged at the bottom of the tank body (1). Compared with the prior art, the pressure type air flotation separation device has the advantages that: the interference of large air bubbles with the oil-water flotation separation area is avoided, the oil-water separation interface is more stable and the separation efficiency is high; mutual fusion of micro air bubbles is inhibited, so that the success rate of the contact and adhesion between the micro air bubbles and oil drops with small particle sizes is improved considerably; and thus, the oil-water separation effect is improved considerably. In addition, the device adopts a sealed tank body, so harmful gases are prevented from leaking to the outside.
Description
Technical field
The present invention relates to the technical field that oily water separations such as ocean platform, oil field, land are handled, be meant a kind of under band press strip spare and use the pressure type gas floatation separation device that the air supporting method makes oily water separation especially.
Background technology
In the generation of oil and Sweet natural gas, transport and preserve in the process, main natural concomitant product is exactly a water.For the oil field oil-containing water that makes the different quality characteristics reaches re-injection or emission standard, the oil-containing water processing technological flow according to present main flow can roughly be divided into: gravity type boat davit is received oil, sedimentation, filtering process; Coalescent settlement separate, filtering process of pressure type and flotation formula are removed three kinds of basic oil-containing water tupes such as oil purification, filtering process.
As oil-containing water waste-oil scavenger main in the flotation formula flow process, most of air-floating apparatus mainly is to take the floatation process of partial reflux to feed gas in pending oil-containing water, makes oil-containing water become gas-oil-water three-phase mixture system.Most of bubble contacts with the oil-containing water thorough mixing in this process, and bubble and oil droplet are sticked together as far as possible.Along with bubble volume in floating-upward process constantly expands, the corresponding increase of suffered buoyancy, the profit density difference constantly increases, and oil droplet is flotated by bubble and realizes that oil droplet with water isolating purpose takes place in air-floating apparatus.
Usually the principal element that influences oil removal by air bubbling efficient comprises: the adhesivity of bubble and oil droplet and air pocket are to the disturbance of oily water separation etc.Generally for oil droplet can effectively be separated from oil-containing water, require the bubble in the pressure type gas floatation separation device flotation area to distribute fine and smooth and even, so both helped the bubble adhesion oil droplet, and can avoid bubble to assemble fast again and form air pocket and produce disturbance in oil water separation process, having stablized fluid to be separated.
But existing dissolved air water reliever mainly is by draw effusive form, forms high speed dissolved air water fluid, the gas come-up that expands rapidly in this process, increase the unstable of fluid flow, easily caused isolating profit generation back-mixing, reduced oily water separation efficient.In addition because the dissolved air water reliever easily stops up, need irregularly cleaning, also need complete machine to stop inspection sometimes, thereby safeguard that the reclamation work amount is big, influence production efficiency.
Summary of the invention
Technical problem to be solved by this invention is the present situation at prior art, provide a kind of and do not adopt reliever and make more laborsaving, the pressure type gas floatation separation device easily of repair and maintenance work, this pressure type gas floatation separation device can also significantly improve oil-water separation.
The present invention solves the problems of the technologies described above the technical scheme that is adopted: this pressure type gas floatation separation device is characterized in that including tank body, is arranged on jar an intravital receipts oil tube and a bubble rectification tube;
Wherein, described bubble rectification jacket casing is located to be received outside the oil tube, receive that the oil tube is fixed with the relative tank body of bubble rectification tube and with the setting of tank body concentric;
Be provided with annular bottom plate between the bottom of described bubble rectification tube and the inner side-wall of tank body, and between the inner side-wall of the outer side wall of bubble rectification tube and tank body, form the bubble commutating zone of closed bottom, described bubble rectification tube and the flotation separation district of receiving formation bottom opening between inner side-wall that has spacing between the oil tube and make bubble rectification tube and the outer side wall of receiving the oil tube are provided with the oil exit pipe that stretches out outside tank body and receive oily tube bottom;
And on the described tank body, the position (promptly being positioned at the position of annular bottom plate top) that is positioned at bubble commutating zone bottom is provided with the dissolved air water inlet pipe that an oil-containing water inlet pipe and that tangentially enters tangentially enters, and tank base is provided with water shoot;
Simultaneously, also be provided with one at a described receipts oil tube top and receive the slag flow deflector, this receipts slag flow deflector is one to be the slice template of involute urve shape, the gradually evolution of its setting to described gas commutating zone in liquid eddy flow direction just in time opposite.
This pressure type gas floatation separation device is when operation, oil-containing water and dissolved air water enter the bottom of bubble commutating zone respectively from inlet pipe separately under pressure stable, both are along tank body inner side-wall generation eddy flow, and thorough mixing, make the micro bubble in the dissolved air water contact and stick on the oil droplet with oil droplet in the oil-containing water fully;
Because the bottom of bubble commutating zone is airtight, the mixture of oil-containing water and dissolved air water flows to the top of bubble commutating zone, then the top that climbs over bubble rectification tube enters the flotation separation district, hydraulic pressure pressure reduces because micro bubble rises along with water level, and volume constantly expands, the also corresponding increase of suffered buoyancy, therefore, in the flotation separation district, the most of oil droplet that is stained with micro bubble stably floatingly selects the water surface, and forms scum silica frost;
Simultaneously, owing in the flotation separation district, formed the oil-containing water of scum silica frost, its eddy flow direction is just in time opposite with the closing in direction of receiving the slag flow deflector, emersion is being received under the effect of slag flow deflector at the scum silica frost at top, flotation separation district, enter into smoothly and receive oil tube top inlet, then by the oil exit pipe of receiving oily tube bottom outside the discharger;
Clear water after separating in the flotation separation district flows to the bottom of tank body through the bottom opening in flotation separation district, at last by the water shoot of tank base outside the discharger.
For guaranteeing fully the contacting of dissolved air water and oil-containing water, mixing, described oil-containing water inlet pipe and dissolved air water inlet pipe with vertical relatively be good.
Because a jar intravital device is to be under the airtight operating mode with pressure to move, thereby in order to be easy to control water-oil interface, can a pair of receipts an oil interface of the level gauge be set being positioned at position of receiving above the oil tube and the position that communicates with oil exit pipe on the tank body, also be provided with a pair of whole interface of the level gauge on the described tank body.
As further improvement, described tank body top can also be provided with the vapor pipe of a band valve, thereby safety relief interface as unnecessary gas in the tank body, when this installs in operation, if during jar intravital hypertonia, can be by controlling the valve of this vapor pipe automatically, release portion gas and make jar intravital pressure reach the design conditions requirement.
Preferably, described receipts oil tube is one to have the cylindrical tube of hopper-bottom, links to each other with bubble rectification tube by being arranged on peripheral fixed link, can satisfy the support strength requirement of receiving oil tin.
Simultaneously, described receipts slag flow deflector, its set-up mode is fixing as long as receive the oil tube relatively, but for guaranteeing that the scum silica frost on the working level can enter the top inlet of receiving the oil tube smoothly, one end of described receipts slag flow deflector can link to each other with the described top inlet sidewall of receiving the oil tube, the other end then links to each other with the sidewall of described bubble rectification tube, can make like this to receive the fixing more firm of slag flow deflector.
For improving the purity of the clear water of discharging from water shoot, can be in described tank body, be positioned at bubble rectification tube below packing layer is set, so, from of the once more filtration of the effusive clear water of bubble rectification tube bottom through packing layer, that is, the oil droplet in the clear water can be attached on the packing layer, and final drain tank is external, can further reduce the oil concentration in the clear water, reach the advanced treatment effect of oil-containing water.This packing layer can carry out back flushing by the clear water that enters from water shoot, reaches the purpose of sustainable use.
Compared with prior art, the invention has the advantages that:
At first, device of the present invention makes oil-containing water and dissolved air water flow and thorough mixing by eddy flow, make bubble evenly fine and smooth more in the contact of oil-containing water, guarantee to satisfy the requirement of dispersed oil, oil in water emulsion and dissolving oil that microbubble as much as possible goes to adhere to small particle size, avoided the interference of air pocket to profit flotation separation district, make oil-water separation interface more stable, separation efficiency improves, and suppressed the mutual fusion of micro bubble, make micro bubble and small particle size oil droplet contact and adhere to successful probability and significantly improve, thereby can significantly improve oil-water separation;
Secondly, this device adopts the tank body sealing, has avoided obnoxious flavour to leak, and has improved safety performance, helps the protection to environment;
Simultaneously, by interface of the level gauge is set, link to each other with extraneous liquidometer, can realize the interface control of oily water separation under the air tight condition, guarantee that scum silica frost continuously enters receipts oil tube from receiving oil tube top, and then outside the discharger, realize the target of profit high efficiency separation under controlled condition, this device is specially adapted to high density (2500-3500ppm) oil-containing water processing under the band press strip spare in the Application Areass such as ocean platform, oil field, land;
In addition, this device has been avoided because of reliever is set, and the problem of the shutdown emptying maintenance that causes often takes place to stop up, and does not need to increase the external enwergy cleaning system, can realize the target of long-term continous-stable operation;
Once more, this device utilizes the receipts slag flow deflector of closing in shape to receive oil, has utilized the flow collection scum silica frost of oil-containing water itself, has saved the link that external moving equipment scums, and has realized requirements of saving energy;
At last, packing layer is set, can catches oil droplet, the oil removing flow process is simplified greatly, can finish the intensification of oil-containing water and handle by the adsorption effect of holding back of packing layer in lower part of this device.
Description of drawings
Fig. 1 is the structural representation of the embodiment of the invention one;
Fig. 2 be among Fig. 1 A-A to sectional view;
Fig. 3 is the structural representation of the embodiment of the invention two.
Embodiment
Embodiment describes in further detail the present invention below in conjunction with accompanying drawing.
Embodiment one:
As shown in Figure 1 and Figure 2, this pressure type gas floatation separation device includes tank body 1, is arranged on the bubble rectification tube 2 in the tank body 1 and receives oil tube 3;
Wherein, described receipts oil tube 3 is one to have the cylindrical tube of hopper-bottom 31, be the uniform fixed link of divergent shape 32 and fix by being arranged on two groups of receiving oil tube 3 peripheries with air supporting rectification tube 2, bubble rectification tube 2 is set in to be received outside the oil tube 3, be provided with annular bottom plate 21 between the bottom of bubble rectification tube 2 and the inner side-wall of tank body 1, thereby bubble rectification tube 2 and tank body 1 are fixed, receive that oil tube 3 is fixed with bubble rectification tube 2 relative tank bodies 1 and with tank body 1 concentric setting;
Form the bubble commutating zone A of closed bottom between the outer side wall of described bubble rectification tube 2 and the inner side-wall of tank body 1;
Described bubble rectification tube 2 and receive between the oil tube 3 and have spacing, and form the flotation separation district B of bottom opening between the inner side-wall that makes bubble rectification tube 2 and the outer side wall of receiving oil tube 3, be provided with the oil exit pipe 6 that stretches out outside tank body 1 and receive oil 3 bottom;
A pair of receipts an oil interface of the level gauge 8,12 is set being positioned at position of receiving above the oil tube 3 and the position that communicates with oil exit pipe 6 on the described tank body 1, also is provided with a pair of whole interface of the level gauge 14,15 on the described tank body 1;
On the described tank body 1, the position (promptly being positioned at the position of annular bottom plate 21 tops) that is positioned at bubble commutating zone A bottom is provided with the dissolved air water inlet pipe 5 that an oil-containing water inlet pipe 4 and that tangentially enters tangentially enters, this oil-containing water inlet pipe 4 and the vertical relatively setting of dissolved air water inlet pipe 5, and tank body 1 bottom is provided with water shoot 11, and tank body 1 top is provided with the vapor pipe 13 of a band valve;
Simultaneously, also be provided with one at described receipts oil tube 3 tops and receive slag flow deflector 7, this receipts slag flow deflector 7 is one to be the slice template of involute urve shape, the gradually evolution of its setting to described gas commutating zone A in liquid eddy flow direction just in time opposite, the one end links to each other with the top inlet sidewall of receiving oil tube 3, the other end then links to each other with the sidewall of bubble rectification tube 2, thus secure fixation, referring to Fig. 2.
The principle of work of this gas floatation separation device is as follows:
Oil-containing water and dissolved air water enter the bottom of bubble commutating zone A respectively from inlet pipe separately under pressure stable, both are along tank body 1 inner side-wall generation eddy flow, and thorough mixing, make the micro bubble in the dissolved air water contact and stick on the oil droplet with oil droplet in the oil-containing water fully;
The mixture of oil-containing water and dissolved air water flows to the top of bubble commutating zone A, and the top that climbs over bubble rectification tube 2 then enters flotation separation district B, and at flotation separation district B, the most of oil droplet that is stained with micro bubble stably floatingly selects the water surface, and forms scum silica frost;
Simultaneously, emersion is being received under the effect of slag flow deflector 7 at the scum silica frost at B top, flotation separation district, enters into smoothly to receive oil tube 3 tops inlet, then by the oil exit pipe 6 of receiving oil tube 3 bottoms outside the discharger;
Clear water after separating among the flotation separation district B flows to the bottom of tank body 1 through the bottom opening of flotation separation district B, at last by the water shoot 11 of tank body 1 bottom outside the discharger.
Embodiment two:
As shown in Figure 3, embodiments of the invention two are with the distinctive points of embodiment one: in described tank body 1, be positioned at bubble rectification tube 2 below be provided with packing layer 16, the adsorption effect of holding back by packing layer 16 is caught oil droplet, the oil removing flow process is simplified greatly, can be finished the intensification of oil-containing water and handle.
Claims (7)
1. a pressure type gas floatation separation device is characterized in that including tank body (1), is arranged on receipts oil tube (3) and bubble rectification tube (2) in the tank body (1);
Wherein, described bubble rectification tube (2) is set in to be received outside the oil tube (3), receive that oil tube (3) and the relative tank body of bubble rectification tube (2) (1) are fixed and with tank body (1) concentric setting;
Be provided with annular bottom plate (21) between the inner side-wall of the bottom of described bubble rectification tube (2) and tank body (1), and between the inner side-wall of the outer side wall of bubble rectification tube (2) and tank body (1), form the bubble commutating zone (A) of closed bottom, described bubble rectification tube (2) and receive between inner side-wall that has spacing between the oil tube (3) and make bubble rectification tube (2) and the outer side wall of receiving oil tube (3) and form the flotation separation district (B) of bottom opening is provided with the oil exit pipe (6) that stretches out outside tank body (1) and receive bottom the oil tube (3);
And the position that bubble commutating zone (A) bottom was gone up, was positioned to described tank body (1) is provided with the dissolved air water inlet pipe (5) that an oil-containing water inlet pipe (4) and that tangentially enters tangentially enters, and tank body (1) bottom is provided with water shoot (11);
Simultaneously, also be provided with one at described receipts oil tube (a 3) top and receive slag flow deflector (7), this receipts slag flow deflector (7) is one to be the slice template of involute urve shape, the gradually evolution of its setting to described gas commutating zone (A) in liquid eddy flow direction just in time opposite.
2. pressure type gas floatation separation device according to claim 1 is characterized in that: described oil-containing water inlet pipe (4) is vertical relatively with dissolved air water inlet pipe (5).
3. pressure type gas floatation separation device according to claim 1, it is characterized in that: on described tank body (1), be positioned at position of receiving oil tube (3) top and the position that communicates with oil exit pipe (6) a pair of receipts oil tube interface of the level gauge (8,12) is set, also be provided with a pair of whole interface of the level gauge (14,15) on the described tank body (1).
4. pressure type gas floatation separation device according to claim 1 is characterized in that: described tank body (1) top also is provided with the vapor pipe (13) of a band valve.
5. pressure type gas floatation separation device according to claim 1, it is characterized in that: described receipts oil tubes (3) are one to have the cylindrical tube of hopper-bottom (31), receive the peripheral fixed link (32) of oil tube (3) and link to each other with air supporting rectification tube (2) by being arranged on.
6. pressure type gas floatation separation device according to claim 1 is characterized in that: an end of described receipts slag flow deflector (7) links to each other with the described top inlet sidewall of receiving oil tube (3), and the other end then links to each other with the sidewall of described bubble rectification tube (2).
7. according to the described pressure type gas floatation separation device of arbitrary claim in the claim 1 to 6, it is characterized in that: in described tank body (1), the below that is positioned at bubble rectification tube (2) is provided with packing layer (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102905664A CN101935081B (en) | 2010-09-19 | 2010-09-19 | Pressure type air flotation separation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010102905664A CN101935081B (en) | 2010-09-19 | 2010-09-19 | Pressure type air flotation separation device |
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| Publication Number | Publication Date |
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| CN101935081A true CN101935081A (en) | 2011-01-05 |
| CN101935081B CN101935081B (en) | 2012-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2010102905664A Active CN101935081B (en) | 2010-09-19 | 2010-09-19 | Pressure type air flotation separation device |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250027A (en) * | 2014-09-26 | 2014-12-31 | 滁州友林科技发展有限公司 | Air floatation machine capable of improving distribution uniformity of bubbles |
| CN107235532A (en) * | 2017-05-16 | 2017-10-10 | 方明环保科技(漳州)有限公司 | The separator of energy oil-water separation |
| CN108979616A (en) * | 2018-08-22 | 2018-12-11 | 宁波信意达油气技术合伙企业(有限合伙) | A kind of water diversion system and turnout reason method of well head production |
| CN110980983A (en) * | 2019-11-13 | 2020-04-10 | 江苏亚洲环保有限公司 | Vertical flow type solid-liquid separator |
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| US5080780A (en) * | 1988-10-11 | 1992-01-14 | Process Development Company | Single cell vertical static flow flotation unit cross-reference to related applications |
| CN1474710A (en) * | 2000-11-21 | 2004-02-11 | ���տ�ŵ������˾ | Combined degassing and flotation tank |
| JP2006075814A (en) * | 2004-09-10 | 2006-03-23 | Cnk:Kk | Water-in-oil separation apparatus |
| CN201157703Y (en) * | 2007-11-28 | 2008-12-03 | 北京石油化工学院 | Compact type rotary flow air float separating device for oily wastewater treatment |
| CN201801396U (en) * | 2010-09-19 | 2011-04-20 | 宁波威瑞泰默赛多相流仪器设备有限公司 | Pressure-type air flotation separation device |
-
2010
- 2010-09-19 CN CN2010102905664A patent/CN101935081B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5080780A (en) * | 1988-10-11 | 1992-01-14 | Process Development Company | Single cell vertical static flow flotation unit cross-reference to related applications |
| CN1474710A (en) * | 2000-11-21 | 2004-02-11 | ���տ�ŵ������˾ | Combined degassing and flotation tank |
| JP2006075814A (en) * | 2004-09-10 | 2006-03-23 | Cnk:Kk | Water-in-oil separation apparatus |
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| CN201801396U (en) * | 2010-09-19 | 2011-04-20 | 宁波威瑞泰默赛多相流仪器设备有限公司 | Pressure-type air flotation separation device |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104250027A (en) * | 2014-09-26 | 2014-12-31 | 滁州友林科技发展有限公司 | Air floatation machine capable of improving distribution uniformity of bubbles |
| CN107235532A (en) * | 2017-05-16 | 2017-10-10 | 方明环保科技(漳州)有限公司 | The separator of energy oil-water separation |
| CN108979616A (en) * | 2018-08-22 | 2018-12-11 | 宁波信意达油气技术合伙企业(有限合伙) | A kind of water diversion system and turnout reason method of well head production |
| CN108979616B (en) * | 2018-08-22 | 2023-12-19 | 宁波信意达油气技术合伙企业(有限合伙) | Water diversion system and water diversion treatment method for wellhead produced materials |
| CN110980983A (en) * | 2019-11-13 | 2020-04-10 | 江苏亚洲环保有限公司 | Vertical flow type solid-liquid separator |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101935081B (en) | 2012-07-25 |
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Denomination of invention: Pressure type air flotation separation device Effective date of registration: 20120829 Granted publication date: 20120725 Pledgee: Ningbo Free Trade Zone, Bao Bao middle and small enterprises, Company limited by guarantee Pledgor: Veritas-MSI (Ningbo) Co.,Ltd. Registration number: 2012990000476 |
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