CN202733313U - Automatic lifting device with cryogenic liquid throttle for conveying liquid - Google Patents
Automatic lifting device with cryogenic liquid throttle for conveying liquid Download PDFInfo
- Publication number
- CN202733313U CN202733313U CN2012203362373U CN201220336237U CN202733313U CN 202733313 U CN202733313 U CN 202733313U CN 2012203362373 U CN2012203362373 U CN 2012203362373U CN 201220336237 U CN201220336237 U CN 201220336237U CN 202733313 U CN202733313 U CN 202733313U
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- China
- Prior art keywords
- cryogenic liquide
- throttle valve
- pipe
- gas
- valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn - After Issue
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04406—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system
- F25J3/04412—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air using a dual pressure main column system in a classical double column flowsheet, i.e. with thermal coupling by a main reboiler-condenser in the bottom of low pressure respectively top of high pressure column
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04763—Start-up or control of the process; Details of the apparatus used
- F25J3/04769—Operation, control and regulation of the process; Instrumentation within the process
- F25J3/04793—Rectification, e.g. columns; Reboiler-condenser
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2205/00—Processes or apparatus using other separation and/or other processing means
- F25J2205/02—Processes or apparatus using other separation and/or other processing means using simple phase separation in a vessel or drum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J2235/00—Processes or apparatus involving steps for increasing the pressure or for conveying of liquid process streams
- F25J2235/06—Lifting of liquids by gas lift, e.g. "Mammutpumpe"
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
Abstract
The utility model relates to an automatic lifting device with a cryogenic liquid throttle for conveying a liquid. The automatic lifting device comprises at least one cryogenic liquid throttle connected to a cryogenic liquid conveying pipe in series, and a gas filled pipe fitting is arranged on the conveying pipe in a certain distance after the cryogenic liquid throttle. One end of the gas filled pipe fitting is connected with a gas-filled pipe after the cryogenic liquid throttle, and the other end of the gas filled pipe fitting is connected with an external gas-filled gas source pipe. The gas filled pipe fitting is composed of a gas filled pipe sleeve connected to the conveying pipe and a gas filled pipeline connected to the gas filled pipe sleeve. The gas filled pipe sleeve is divided into an outer pipe and an inner pipe, small gas filled holes are formed in the pipe wall of the inner pipe, and the inner pipe is directly abutted and communicated with the conveying pipe. The automatic lifting device has the characteristics of simple structure and convenience and reliability in use, the problem that the cryogenic liquid throttle is difficult to convey fluid as the direct coupling height of a rectifying column is increased or the lower column pressure is reduced can be greatly solved, and the unit consumption in oxygen generation of an air separation plant can be obviously reduced.
Description
Technical field
The utility model relates to a kind of cryogenic liquide throttle valve and carry the automatic lifting device of liquid, be used for the conveying capacity that the Deep Cooling Method air separation facility improves the cryogenic liquide throttle valve, especially be applicable to large-scale low energy consumption air separation facility, belong to the technological process ancillary technique in air separation field.
Background technique
Utilizing principles of rectification to separate air under cryogenic conditions is a kind of known deep cooling technology.Its basic principle is at first will process air liquefaction, then utilizes the boiling-point difference of the components such as oxygen, nitrogen to adopt rectificating method to make air separation obtain oxygen and nitrogen.Typical air separation facility comprises following equipment: raw air filter, air turbine compressor, air cooling tower, molecular sieve adsorber, booster expansion turbine, heat exchanger, rectifying column and cryogenic liquide throttle valve etc.Rectifying column then is comprised of Xia Ta, upper tower and main condenser vaporizer.Twin-stage rectifying, namely adopting simultaneously Xia Ta and Shang Ta is core and the distinguishing feature of typical deep cooling technology.Shang Ta and lower tower are realized the rectifying coupling by main condenser vaporizer and pipe valve.As everyone knows, the saturation temperature of pure oxygen is higher than the saturation temperature of purity nitrogen under same pressure.Such as, 1 * 10
5Under the Pa pressure condition, the saturation temperature of pure oxygen is-183 ℃, and the saturation temperature of purity nitrogen is-196 ℃.This expression nitrogen more easily gasifies than oxygen.But under different pressures, the saturation temperature of nitrogen might be higher than oxygen.In air separation facility, for the liquid oxygen that guarantees upper tower evaporates at condenser/evaporator, gas nitrogen condensation in condenser/evaporator of lower tower must make the saturation temperature of lower tower nitrogen be higher than the saturation temperature of tower oxygen.Corresponding therewith, the working pressure of lower tower will be higher than the working pressure of tower, and therefore lower tower is called again pressure column, and upper tower is called again lower pressure column.When upper tower pressure one timing, the pressure of lower tower is determined by the main cold temperature difference.If the temperature difference of condenser/evaporator obtains greatly, the pressure of lower tower also will improve, and the power that the air compressor of air separation facility is consumed can increase.Otherwise the power of consumption can reduce.
In the empty minute flow process of typical twin-stage rectifying,, be throttled to and send into respectively lower pressure column (upper tower) different parts behind the lower pressure and further realize the rectifying of oxygen nitrogen all by the cryogenic liquide throttle valve from the cryogenic liquide (oxygen-enriched liquid air or liquid nitrogen) of the elevated pressures of pressure column (lower tower).Here, the cryogenic liquide throttle valve is two effects of performance when realizing the fluid conveying function: the one, and decompression, the 2nd, cooling (isenthalpic throttling positive-effect).The size of pressure reduction plays a key effect to the conveying capacity of cryogenic liquide throttle valve before and after the valve.Front and back pressure reduction=the upstream pressure of cryogenic liquide throttle valve-downstream pressure＞0.The downstream pressure of cryogenic liquide throttle valve by upper tower pressure and valve after fluid column pressure reduction jointly determine.And the upstream pressure of cryogenic liquide throttle valve is determined jointly by position height and the lower tower liquid outlet height of valve, is finally determined by lower pressure tower.
In recent years, divide the development growth in market along with sky, air separation facility more and more trends towards maximizing and energy-saving, requires again the simple cost of investment of flow process few simultaneously.The maximization of air separation facility must bring the maximization of rectifying column.The rising that divides the scale grade along with sky, rectifying column comprise that the length of tower lengthens thereupon under the tower, and the total height that the direct lotus root of double rectification column is closed is also just more and more higher.Simultaneously, the energy-saving of air separation facility requires lower tower operation pressure low as far as possible.The direct lotus root of rectifying column is closed the increase of height and the reduction of lower tower operation pressure all will cause the valve front and back pressure reduction of cryogenic liquide throttle valve to reduce.But, operational characteristic according to the cryogenic liquide throttle valve can be known, the direct lotus root of rectifying column is closed the increase of height and the theoretical limit of the reduction of lower tower operation pressure is the front and back pressure reduction ≈ 0 of cryogenic liquide throttle valve, and perseverance be on the occasion of, otherwise twin-stage rectifying operating mode can not be set up; And in the actual motion, there is the malleation value of a minimum in pressure reduction before and after the cryogenic liquide throttle valve; The rectifying column partition is not met the requirement that flow process is oversimplified.
Summary of the invention
The purpose of this utility model is to overcome the deficiency that prior art exists, and provide a kind of cryogenic liquide throttle valve to carry the automatic lifting device of liquid, be mainly used in the large-scale low energy consumption air separation facility solving the direct lotus root of rectifying column and close and highly increase or lower pressure tower reduces the cryogenic liquide throttle valve conveying fluid difficult problem that brings, it can reduce the Unit consumption for oxygen production of air separation facility significantly.
The purpose of this utility model is achieved by the following technical solution: which comprises at least a cryogenic liquide throttle valve that is serially connected on the cryogenic liquide delivery line, an end is set and is filled the inflation pipe fitting that pipeline links to each other, the other end links to each other with outside source of inflation gas pipeline behind the cryogenic liquide throttle valve on the delivery line behind the described cryogenic liquide throttle valve in the certain distance.
Described inflation pipe fitting is socketed in the inflation pipe box on the delivery line by one and is connected to the gas ducting that described gas tube puts and forms, described inflation pipe box is comprised of outer tube and inner tube, and inner tube and described delivery line that the inflation aperture is set on the tube wall directly are docked and connected.
On the outside source of inflation gas pipeline that described inflation pipe fitting one end links to each other a modulating valve, a safety valve and a check valve are set at least; Described inflation modulating valve is higher than the cryogenic liquide throttle valve that is inflated at the valve location absolute altitude.
Manage outer source of inflation gas and pass through the inflation aperture with certain flow rate, the interior cryogenic liquide acceleration of pipe gasification is risen after driving the cryogenic liquide throttle valve, thereby reduce the downstream pressure of cryogenic liquide throttle valve, arrive the above numerical value of minimum positive differential pressure (containing) that throttle valve requires, finally make behind the cryogenic liquide throttle valve the interior cryogenic liquide of pipe enter smoothly tower and set up the rectifying operating mode.
As special case, described inflation pipe fitting can be comprised of one section gas ducting that directly is plugged on delivery line inside, and its interpolation pipeline section flows to and flows to necessary in the same way coaxial with cryogenic liquide.At this moment, the outlet of interpolation inflation pipeline section is equivalent to play the effect of inflation aperture.
The minimum inflation pressure of source of inflation gas is determined according to the cryogenic liquide throttle valve upstream pressure that is inflated, the temperature of source of inflation gas is corresponding saturation temperature under normal temperature or the lower pressure tower, the maximum rate of gasification that allows behind the minimum positive differential pressure that the large-minded rootlet of source of inflation gas requires according to the cryogenic liquide throttle valve, the valve and upper tower Research of The Minimum Reflux Ratio of Rectification etc. aggregation of variable calculative determination.
For the strict occasion of upper tower rectifying reflux ratio, the utility model proposes the solution of " inflation+gas-liquid separation " Integrated using, namely before entering lower pressure column C2, delivery line 1 is provided with a gas-liquid separator PV1, as shown in Figure 2.
The cryogenic liquide throttle valve that the utility model is not limited to solve between lower tower (pressure column) and the upper tower (lower pressure column) is carried flow problem, the cryogenic liquide throttle valve that is applicable to simultaneously solve between lower tower (pressure column) and other low-voltage equipments is carried flow problem, such as liquid air throttle valve between lower tower and crude argon condenser, lower tower and pure argon condenser interstitial fluid nitrogen throttle valve etc.
It has simple in structure, and is easy to use and reliable, can solve preferably the direct lotus root of rectifying column and close highly increase or descend pressure tower to reduce the problems such as cryogenic liquide throttle valve conveying fluid difficulty of bringing, and can reduce significantly the characteristics such as Unit consumption for oxygen production of air separation facility.
Description of drawings
Fig. 1 is typical air separation facility process flow diagram;
Fig. 2 is inflation schematic flow sheet of the present utility model;
Fig. 3 is inflation pipe fitting structural representation described in the utility model;
Fig. 4 is a special case of inflation pipe fitting structural representation described in the utility model.
Embodiment
Below in conjunction with accompanying drawing the utility model is described in detail: shown in Figure 1 is existing typical air separation facility process flow diagram; Having shown in the figure: raw air filter AF, air compressor TC, air cooling tower AC, molecular sieve adsorber MS1/MS2, booster expansion turbine BT1/ET1, main heat exchanger E1, subcooler E2, pressure column C1, main condenser vaporizer K1, lower pressure column C2, cryogenic liquide throttle valve V, electric heater EH, air releasing silencer SL, water pump WP1/WP2, water-cooling tower WC.
Shown in Figure 2 is inflation schematic flow sheet of the present utility model, having shown in the figure: pressure column C1, lower pressure column C2, main condenser vaporizer K1, subcooler E2, cryogenic liquide throttle valve V1, gas-liquid separator PV1, external air source modulating valve Va, check valve Vb, safety valve Vc is apart from length A, cryogenic liquide feeding and discharging height difference B, valve height difference C.
Cryogenic liquide throttle valve described in the utility model is carried the automatic lifting device of liquid, which comprises at least a cryogenic liquide throttle valve V1 who is serially connected on the cryogenic liquide delivery line, an end is set and is filled the inflation pipe fitting 2 that pipeline links to each other, the other end links to each other with outside source of inflation gas pipeline behind the cryogenic liquide throttle valve on the delivery line 1 behind the described cryogenic liquide throttle valve V1 in the certain distance.On the outside source of inflation gas pipeline that described inflation pipe fitting 2 one ends link to each other a modulating valve Va, a safety valve Vc and a check valve Vb are set at least; Described inflation modulating valve Va is higher than the cryogenic liquide throttle valve V1 that is inflated at the valve location absolute altitude.
Shown in Figure 3, described inflation pipe fitting 2 is socketed in the inflation pipe box 21 on the delivery line by one and is connected to the gas ducting 22 that described gas tube puts and forms, described inflation pipe box 21 is comprised of outer tube 211 and inner tube 212, and the inner tube 212 that inflation aperture 213 is set on the tube wall directly is docked and connected with described delivery line.
Figure 4 shows that another enforcement special case of the present utility model, wherein said inflation pipe fitting 2 is comprised of one section gas ducting 23 that directly is plugged on delivery line inside.Its interpolation pipeline section flows to and flows to necessary in the same way coaxial with cryogenic liquide.
Manage outer source of inflation gas and pass through inflation pipe fitting 2 with certain flow rate, the interior cryogenic liquide acceleration of pipe gasification is risen after driving cryogenic liquide throttle valve V1, thereby reduce the downstream pressure of cryogenic liquide throttle valve, arrive the above numerical value of minimum positive differential pressure (containing) that throttle valve requires, finally make behind the cryogenic liquide throttle valve the interior cryogenic liquide of pipe enter smoothly tower and set up the rectifying operating mode.
The minimum inflation pressure of source of inflation gas is determined according to the cryogenic liquide throttle valve upstream pressure that is inflated, the temperature of source of inflation gas is corresponding saturation temperature under normal temperature or the lower pressure tower, the maximum rate of gasification that allows behind the minimum positive differential pressure that the large-minded rootlet of source of inflation gas requires according to the cryogenic liquide throttle valve, the valve and upper tower Research of The Minimum Reflux Ratio of Rectification etc. aggregation of variable calculative determination.
For the strict occasion of upper tower rectifying reflux ratio, the utility model proposes the solution of " inflation+gas-liquid separation " Integrated using, namely before entering lower pressure column C2, delivery line 1 is provided with a gas-liquid separator PV1, as shown in Figure 2.
The cryogenic liquide throttle valve that the utility model is not limited to solve between lower tower (pressure column) and the upper tower (lower pressure column) is carried flow problem, the cryogenic liquide throttle valve that is applicable to simultaneously solve between lower tower (pressure column) and other low-voltage equipments is carried flow problem, such as liquid air throttle valve between lower tower and crude argon condenser, lower tower and pure argon condenser interstitial fluid nitrogen throttle valve etc.
Embodiment:
Shown in Figure 2, the cryogenic liquide that pressure column C1 extracts out in the typical double rectification column direct-coupling model is sent into lower pressure column through cryogenic liquide throttle valve V1.As follows according to energy-saving and cost-reducing demand large-scale space division device rectifying column parameter: pressure column C1 operation pressure is 0.5MPa (A), lower pressure column C2 operation pressure is 0.14 MPa (A), the cryogenic liquide inlet height difference B that the cryogenic liquide of pressure column is exported to lower pressure column is 50m, cryogenic liquide throttle valve V1 is 10m to the cryogenic liquide outlet height difference C of pressure column, and cryogenic liquide density is 850kg/m
3Gravity accleration is taken as 10m/s
2Then according to preliminary tentative calculation, cryogenic liquide head of liquid ≈ 0.5-850*10*10/1000000=0.415 (MPa (A)) before cryogenic liquide throttle valve V1 upstream pressure=pressure column C1 operation pressure-valve, and cryogenic liquide head of liquid ≈ 0.14+850*10* (50-10)/1000000=0.48 (MPa (A)) behind cryogenic liquide throttle valve V1 downstream pressure=lower pressure column C2 operation pressure+valve.Upstream pressure 0.415 MPa (A)＜downstream pressure 0.48 MPa (A), this moment, cryogenic liquide can not pass through throttle valve V1, and twin-stage rectifying operating mode can not be set up.
Adopt the present utility model after the position of certain distance length A behind the cryogenic liquide throttle valve V1 valve arranges an inflation pipe fitting 2 (seeing Fig. 3) or inflation pipe fitting 2 (seeing Fig. 4), dependence is filled with the ambient atmos of certain flow, cryogenic liquide accelerates forced gasification after can making the V1 valve, drives smooth rising of liquid in the fluid density and enter lower pressure column C2 after reducing valve.Fluid density reduces behind the valve, and downstream pressure decreases.As after being filled with the ambient atmos of certain flow, the liquid hybrid density reduces to 600kg/m behind the valve
3Cryogenic liquide head of liquid ≈ 0.14+600*10* (50-10)/1000000=0.38 (MPa (A)) behind cryogenic liquide throttle valve V1 downstream pressure=lower pressure column C2 operation pressure+valve then, upstream pressure 0.415 MPa (A)＞downstream pressure 0.38 MPa (A), this moment, cryogenic liquide can pass through throttle valve V1, and twin-stage rectifying operating mode can be set up smoothly.
As shown in Figure 2, process description after the employing the present utility model is as follows, the cryogenic liquide that pressure column C1 extracts out through subcooler cross be as cold as reach cryogenic liquide throttle valve V1 valve before, extraneous source of inflation gas is after gas overcharging modulating valve Va and check valve Vb arrive cryogenic liquide throttle valve V1 valve.Open the V1 valve, cryogenic liquide quick forced gasification and rise synchronously with air-flow under the effect of ambient atmos, (entering together gas-liquid separator) sends into lower pressure column C2 at last.
Claims (4)
1. a cryogenic liquide throttle valve is carried the automatic lifting device of liquid, which comprises at least a cryogenic liquide throttle valve that is serially connected on the cryogenic liquide delivery line, it is characterized in that an end being set and being filled the inflation pipe fitting that pipeline links to each other, the other end links to each other with outside source of inflation gas pipeline behind the cryogenic liquide throttle valve on the delivery line in the certain distance behind the described cryogenic liquide throttle valve.
2. cryogenic liquide throttle valve according to claim 1 is carried the automatic lifting device of liquid, it is characterized in that described inflation pipe fitting is socketed in the inflation pipe box on the delivery line by one and is connected to the gas ducting that described gas tube puts forms, described inflation pipe box is divided into outer tube and inner tube, and inner tube and described delivery line that the inflation aperture is set on the tube wall directly are docked and connected.
3. cryogenic liquide throttle valve according to claim 1 is carried the automatic lifting device of liquid, it is characterized in that described inflation pipe fitting can be comprised of one section gas ducting that directly is plugged on delivery line inside, its interpolation pipeline section flows to and flows to necessary in the same way coaxial with cryogenic liquide.
According to claim 1 and 2 or 3 described cryogenic liquide throttle valve carry the automatic lifting device of liquid, it is characterized in that on the outside source of inflation gas pipeline that described inflation pipe fitting one end links to each other a modulating valve, a safety valve and a check valve being set at least; Described inflation modulating valve is higher than the cryogenic liquide throttle valve that is inflated at the valve location absolute altitude.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203362373U CN202733313U (en) | 2012-07-12 | 2012-07-12 | Automatic lifting device with cryogenic liquid throttle for conveying liquid |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012203362373U CN202733313U (en) | 2012-07-12 | 2012-07-12 | Automatic lifting device with cryogenic liquid throttle for conveying liquid |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202733313U true CN202733313U (en) | 2013-02-13 |
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ID=47659012
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2012203362373U Withdrawn - After Issue CN202733313U (en) | 2012-07-12 | 2012-07-12 | Automatic lifting device with cryogenic liquid throttle for conveying liquid |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202733313U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734591A (en) * | 2012-07-12 | 2012-10-17 | 杭州杭氧股份有限公司 | Automatic lifting device with low-temperature liquid throttle valve for conveying liquid |
| CN113606866A (en) * | 2021-08-06 | 2021-11-05 | 苏州市兴鲁空分设备科技发展有限公司 | Device and method for preparing nitrogen by air separation |
-
2012
- 2012-07-12 CN CN2012203362373U patent/CN202733313U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102734591A (en) * | 2012-07-12 | 2012-10-17 | 杭州杭氧股份有限公司 | Automatic lifting device with low-temperature liquid throttle valve for conveying liquid |
| CN102734591B (en) * | 2012-07-12 | 2015-08-19 | 杭州杭氧股份有限公司 | A kind of automatic lifting device of cryogenic liquide throttle valve conveying liquid |
| CN113606866A (en) * | 2021-08-06 | 2021-11-05 | 苏州市兴鲁空分设备科技发展有限公司 | Device and method for preparing nitrogen by air separation |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20130213 Effective date of abandoning: 20150819 |
|
| RGAV | Abandon patent right to avoid regrant |