CN103711678A - Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen - Google Patents
Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen Download PDFInfo
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- CN103711678A CN103711678A CN201310741430.4A CN201310741430A CN103711678A CN 103711678 A CN103711678 A CN 103711678A CN 201310741430 A CN201310741430 A CN 201310741430A CN 103711678 A CN103711678 A CN 103711678A
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Abstract
The invention discloses a method and device for preventing a transmission shaft of a cryogenic liquid pump from being frozen. The method comprises the steps that according to the characteristic that bad air nitrogen is dry and stable, the bad air nitrogen generated by an air separation device is used as a blowing-down air source, a bad air nitrogen branch pipeline is guided out from a bad air nitrogen pipeline of the air separation device and used as a main blowing-down air pipe, blowing-down branch pipes of the corresponding number are distributed according to the site requirements, pressure in an existing bad air nitrogen pipeline is utilized for carrying out blowing down on the portions, easy to freeze, of the cryogenic liquid pump shaft, water in the air near the end surface of a cold box of the pump shaft is taken away, and therefore the cold air leaked from the end surface of the cold box is prevented from making contact with the air and forming ice frost; the main blowing-down air pipe and the blowing-down branch pipes are provided with valves, and therefore the flow of the bad air nitrogen can be adjusted according to actual requirements.
Description
Technical field
The invention belongs to air separation technology field, relate in particular to the cryogenic liquid pump in air separation equipment oxygen unit.
Background technique
Cryogenic liquid pump mainly comprises reciprocating cryogenic liquid pump and centrifugal cryogenic liquid pump, at sky, divides in technology and uses extensively, acts on most important.In making oxygen by air separation technique, cryogenic liquid pump is carried is temperature at the cryogenic liquide of-183 ℃ to-200 ℃, require it in course of conveying, to keep low temperature, reduce cold damage as far as possible, otherwise cryogenic liquid pump can be due to the gasification of cryogenic liquide cisco unity malfunction, so the cold insulation of itself and external environment requires high.As shown in Figure 1, the general pump housing 1 is all arranged in pearlife insulation ice chest, by transmission shaft 3, is connected with extraneous housing and motor 2; Because ice chest internal-external temperature difference is very large, although the seal arrangement of pump can prevent the leakage of cryogenic liquide or cold, but cold still more or less (according to sealing state) by pump shaft 3, reach axial end outside cold box plate 4 one week, moisture in ambient air contacts with it and condenses into frost, if cold reveals serious or wet weather is rainy, will outside ice chest, form layers of ice 5 in whole axle 3 surfaces.After cryogenic liquid pump long-play, ice is more long-pending thicker, the easily rotation of clamping stagnation pump shaft, especially for centrifugal cryogenic liquid pump, because the rotating speed of axle is faster, layers of ice more easily causes pump running jam, so that motor load rises, occur to jump pump accident, motor damage even, affects operation and the safety of whole oxygen unit.Addressing the above problem at present the mode generally adopting is to use stand by pump alternation, and the pump of outage state is heated to defrosting; But switching of pump can not be very frequent, when freezing appears in pump shaft, can not process in time, make pump shaft running for a long time under ice sheet jam state, cause the minimizing in working life of pump even to damage pump.
Summary of the invention
For solving above-mentioned problems of the prior art, the invention provides a kind of method that prevents that cryogenic liquid pump pump shaft from freezing, and the device adopting for implementing the method.
The icing reason of cryogenic liquide pump drive shaft is that cold inevitably transmits out by pump shaft, contacts form ice with humid air.Therefore, if the outer pump shaft ambient air of ice chest is kept dry, just can be from preventing that to a great extent pump shaft surface from freezing.The method applied in the present invention is to adopt a covering device from the dirty gas nitrogen pipe road of air separation facility, to draw dirty gas nitrogen as blowing down source of the gas, utilize the pressure in existing dirty gas nitrogen pipe road, according to field demand, each cryogenic liquide pump shaft is easily frozen and locates to blow down, take away near the airborne moisture of pump shaft ice chest end face, thereby stop, from the cold of ice chest face leakage, contact with it formation frost.
Selecting dirty gas nitrogen to be used as blowing source of the gas is mainly because its dry stable characteristic, the nitrogen content of dirty gas nitrogen is generally 94%, dew point is below-75 ℃, relative moisture is in 30% left and right, be used for the pump shaft of High Rotation Speed to blow down the moisture that can not only take away in surrounding atmosphere, and can guarantee Security; Secondly, dirty gas nitrogen is mainly used as molecular sieve adsorber regeneration source of the gas and water-cooling tower heat exchange source of the gas in space division technique, enters atmosphere after use, and rich dirty gas nitrogen also can directly be discharged into atmosphere, therefore using dirty gas nitrogen to do and blow down almost user cost useless of source of the gas, is exhaust gas utilization.Therefore, utilize the dry characteristic of dirty gas nitrogen that the moisture evaporation compared with in humid air is taken away, prevent that pump shaft from freezing is a kind of method of simple and energy-conserving and environment-protective.
Device of the present invention is that the dirty gas source nitrogen pipeline from selecting is nearby drawn a road house steward, on house steward, dispose master control valve, according to on-the-spot needs, from described house steward, draw respectively one or more blowing pipeline again and lead to each cryogenic liquid pump, at every blowing pipeline proximal end place, control valve is all installed, after valve, be equipped with the blowing short tube that a joint is uncovered, when valve open, dirty gas nitrogen can easily freeze and locate to blow down facing to cryogenic liquide pump drive shaft.
Utilize device of the present invention, can be according to the real-world operation situation of pump and frosting state, and the changing condition of weather environment, by the aperture of regulating valve, adjust in time dirty gas nitrogen flow, reach the icing object of prevention pump shaft.
For convenience of applicable, described in apparatus of the present invention, blow down the instrument supply gas pipeline that pipeline can adopt DN6mm～DN12mm.
For solving the method and apparatus that cryogenic liquide pump drive shaft freezes, have the following advantages above:
1. simple, applicability is extensive, is applicable to the cryogenic liquid pump at various scenes;
2. safe and practical, effect is remarkable, concerning the pump shaft of High Rotation Speed, dirty gas nitrogen stable performance and dry, guaranteeing under the prerequisite of safe handling, effectively preventing spreading of transmission shaft surface layers of ice, on producing, guaranteeing the stable and Security of oxygen unit operation.
3. with low cost, energy-conserving and environment-protective, material requested is convenient easily to be got, and only need almost there is no thereafter operating cost at fixed equipments such as some pipelines of early investment and valves, do not need extra power and energy, and the dirty gas nitrogen that enters atmosphere is without any pollution.
Accompanying drawing explanation
The icing schematic diagram in Fig. 1 cryogenic liquid pump ice chest outer pump shaft end face and surface
Fig. 2 blowing-down device duct arrangement of the present invention schematic diagram
Wherein: 1 cryogenic liquid pump body; 2 cryogenic liquid pump external motor; 3 pump drive shafts (are called for short: pump shaft); 4 cold box plates; 5 frosting layers of ices; The dirty gas nitrogen pipe of 6 existing DN50 road; 7 DN12 that newly establish blow down house steward; 8 blow down the DN12 master control valve on house steward; 9 DN12 that newly establish blow down arm; DN12 control valve on 10 arms; 11 blow down short tube.
Embodiment
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail.
The present invention be take centrifugal cryogenic liquid pump as example, and as shown in Figure 1, the pump housing 1, in ice chest, is connected with the motor 2 outside ice chest by passing shaft 3; Cold is delivered to outside ice chest through cold box plate 4 along pump shaft 3, in the 3 end frostings of ice chest outer pump shaft, after operation a period of time, on pump shaft 3 surfaces, forms layers of ice 5.For addressing the above problem, the present invention utilizes the dirty gas nitrogen of the by-product of air separation facility to blow down pump shaft 3, prevents the formation of layers of ice 5.
The specific embodiment of the invention comprises blowing-down device duct arrangement and two aspects of regular job adjustment.Blowing-down device duct arrangement comprises: 1, apart from pump shaft, selecting dirty gas nitrogen pipe road access port the most nearby; 2, configuring pipes material can be selected the instrument supply gas pipeline of DN6～DN12, according to scene, need to set up one or more flow control valves; 3, as shown in Figure 2, blowing assembling pipe joint in the present embodiment comprises: the pipeline 7 that picks out a DN12 from dirty gas nitrogen pipe road 6 upper sheds of existing DN50 is as blowing down house steward, blowing down the control main valve 8 of setting up DN12 on house steward 7, the blowing arm 9 of drawing two DN12 from blowing down house steward 7 is configured to two pumps motor 2, the front DN12 control valve 10 arranging respectively before pump of two pumps motor 2 on blowing down arm 9, after control valve 10, respectively meet the DN12 that a joint is uncovered and blow down short tube 11, the blowing mouth that blows down short tube 11 easily freezes and locates along ice chest exterior edge face facing to pump shaft.After blowing-down device assembling has purged, during use, open and control main valve 8, dirty gas nitrogen is assigned in two blowing arms 9 by blowing down house steward 7, according to field condition, open the also aperture of adjusting control valve 10, dirty gas nitrogen easily blows down at icing place by blowing down 11 pairs of pump shafts of short tube, prevents that it from freezing.
Regular job adjustment comprises: 1, observe real-world operation situation and the frosting situation of pump, adjust dirty gas nitrogen flow; 2,, through tracing observation after a while, determine that dirty gas nitrogen blows down uninterrupted scope; When 3, weather environment changes, adjust and blow down flow.
Claims (4)
1. a method that prevents that cryogenic liquide pump drive shaft from freezing, it is characterized in that: described method is to adopt a covering device from the dirty gas nitrogen pipe road of air separation facility, to draw dirty gas nitrogen as blowing down source of the gas, utilize the dirty gas nitrogen in existing dirty gas nitrogen pipe road, each cryogenic liquide pump shaft is easily frozen and locates to blow down, take away near the airborne moisture of pump shaft ice chest end face, thereby stop, from the cold of ice chest face leakage, contact with it formation frost.
2. a device that prevents that cryogenic liquide pump drive shaft from freezing, described device comprises the dirty gas source nitrogen pipeline of selecting successively nearby, from described pipeline, draw the master control valve on Yi road house steward and house steward, the one or more blowing pipeline that leads to cryogenic liquid pump of drawing respectively from described house steward, and uncovered blowing short tube after the control valve on described blowing pipeline and valve.
3. the device that prevents that cryogenic liquide pump drive shaft from freezing according to claim 2, is characterized in that: can be according to on-the-spot actual demand, by regulating the aperture of above-mentioned each control valve to adjust dirty gas nitrogen flow.
4. the device that prevents that cryogenic liquide pump drive shaft from freezing according to claim 2, is characterized in that: described blowing pipeline can adopt the instrument supply gas pipeline of DN6mm～DN12mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310741430.4A CN103711678A (en) | 2013-12-30 | 2013-12-30 | Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310741430.4A CN103711678A (en) | 2013-12-30 | 2013-12-30 | Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen |
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| CN103711678A true CN103711678A (en) | 2014-04-09 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201310741430.4A Pending CN103711678A (en) | 2013-12-30 | 2013-12-30 | Method and device for preventing transmission shaft of cryogenic liquid pump from being frozen |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715171A (en) * | 2019-10-14 | 2020-01-21 | 中海石油气电集团有限责任公司 | Special online repair purging system for cold insulation structure of LNG pipeline |
| CN110726038A (en) * | 2019-10-14 | 2020-01-24 | 中海石油气电集团有限责任公司 | Special handheld online repair purging system for cold insulation structure of LNG pipeline |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57157080A (en) * | 1981-03-23 | 1982-09-28 | Hitachi Ltd | Oil diffusing pump |
| EP0158295A2 (en) * | 1984-04-10 | 1985-10-16 | Air Products And Chemicals, Inc. | Method and apparatus for improving the sensitivity of a leak detector utilizing a cryopump |
| US4722191A (en) * | 1986-09-17 | 1988-02-02 | Pennwalt Corporation | High vacuum pumping system |
| JPH05272452A (en) * | 1992-03-27 | 1993-10-19 | Shincron:Kk | Cryopump regenerating method |
| JPH06137270A (en) * | 1992-10-23 | 1994-05-17 | Toshiba Corp | Cooling water freezing preventing system for vacuum device |
| JPH08303348A (en) * | 1995-05-10 | 1996-11-19 | Nissin Electric Co Ltd | Liquid nitrogen shrouding device |
| CN1071412C (en) * | 1995-07-06 | 2001-09-19 | 普拉塞尔技术有限公司 | Cryogenic pump system |
| CN102734122A (en) * | 2011-04-05 | 2012-10-17 | 住友重机械工业株式会社 | Cover structure for cryopump, cryopump, start-up method of cryopump, and storage method of cryopump |
| CN203770083U (en) * | 2013-12-30 | 2014-08-13 | 马钢(集团)控股有限公司 | Device for preventing cryogenic liquid pump transmission shaft from being frozen |
-
2013
- 2013-12-30 CN CN201310741430.4A patent/CN103711678A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57157080A (en) * | 1981-03-23 | 1982-09-28 | Hitachi Ltd | Oil diffusing pump |
| EP0158295A2 (en) * | 1984-04-10 | 1985-10-16 | Air Products And Chemicals, Inc. | Method and apparatus for improving the sensitivity of a leak detector utilizing a cryopump |
| US4722191A (en) * | 1986-09-17 | 1988-02-02 | Pennwalt Corporation | High vacuum pumping system |
| JPH05272452A (en) * | 1992-03-27 | 1993-10-19 | Shincron:Kk | Cryopump regenerating method |
| JPH06137270A (en) * | 1992-10-23 | 1994-05-17 | Toshiba Corp | Cooling water freezing preventing system for vacuum device |
| JPH08303348A (en) * | 1995-05-10 | 1996-11-19 | Nissin Electric Co Ltd | Liquid nitrogen shrouding device |
| CN1071412C (en) * | 1995-07-06 | 2001-09-19 | 普拉塞尔技术有限公司 | Cryogenic pump system |
| CN102734122A (en) * | 2011-04-05 | 2012-10-17 | 住友重机械工业株式会社 | Cover structure for cryopump, cryopump, start-up method of cryopump, and storage method of cryopump |
| CN203770083U (en) * | 2013-12-30 | 2014-08-13 | 马钢(集团)控股有限公司 | Device for preventing cryogenic liquid pump transmission shaft from being frozen |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110715171A (en) * | 2019-10-14 | 2020-01-21 | 中海石油气电集团有限责任公司 | Special online repair purging system for cold insulation structure of LNG pipeline |
| CN110726038A (en) * | 2019-10-14 | 2020-01-24 | 中海石油气电集团有限责任公司 | Special handheld online repair purging system for cold insulation structure of LNG pipeline |
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Application publication date: 20140409 |