CN108100675A - Ice chest pearlife takes off sand device and method - Google Patents

Ice chest pearlife takes off sand device and method Download PDF

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Publication number
CN108100675A
CN108100675A CN201711344881.9A CN201711344881A CN108100675A CN 108100675 A CN108100675 A CN 108100675A CN 201711344881 A CN201711344881 A CN 201711344881A CN 108100675 A CN108100675 A CN 108100675A
Authority
CN
China
Prior art keywords
sand
pearlife
ice chest
takes
surge tank
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.)
Pending
Application number
CN201711344881.9A
Other languages
Chinese (zh)
Inventor
杨冰
宋占文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Energy Investment Corp Ltd
Shenhua Ningxia Coal Industry Group Co Ltd
Original Assignee
Shenhua Group Corp Ltd
Shenhua Ningxia Coal Industry Group Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Shenhua Group Corp Ltd, Shenhua Ningxia Coal Industry Group Co Ltd filed Critical Shenhua Group Corp Ltd
Priority to CN201711344881.9A priority Critical patent/CN108100675A/en
Publication of CN108100675A publication Critical patent/CN108100675A/en
Pending legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/04Conveying materials in bulk pneumatically through pipes or tubes; Air slides
    • B65G53/24Gas suction systems
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34Details
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G53/00Conveying materials in bulk through troughs, pipes or tubes by floating the materials or by flow of gas, liquid or foam
    • B65G53/34Details
    • B65G53/52Adaptations of pipes or tubes
    • B65G53/54Flexible pipes or tubes
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G69/00Auxiliary measures taken, or devices used, in connection with loading or unloading
    • B65G69/18Preventing escape of dust
    • B65G69/185Preventing escape of dust by means of non-sealed systems
    • B65G69/186Preventing escape of dust by means of non-sealed systems with aspiration means
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25JLIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J3/00Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B65CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65GTRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
    • B65G2201/00Indexing codes relating to handling devices, e.g. conveyors, characterised by the type of product or load being conveyed or handled
    • B65G2201/04Bulk
    • B65G2201/045Sand, soil and mineral ore

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air Transport Of Granular Materials (AREA)

Abstract

The invention discloses a kind of ice chest pearlifes to take off sand device and method.Ice chest pearlife, which takes off sand device, includes ice chest and the pearlife in the ice chest, and surge tank offers sand inlet and air inlet on the surge tank, and the air inlet is higher than the sand inlet;Suction tube, the suction tube include pump orifice and sand export, and the sand export is connected with the sand inlet, and the pump orifice is arranged in the pearlife in ice chest;Aspirator, the aspirator is connected with the air inlet to be made to generate negative pressure in the surge tank, and the pearlife is entered by the suction tube in the surge tank under suction function.Ice chest pearlife takes off sand method for taking off sand.Ice chest pearlife provided by the invention takes off sand device and method, reduces labor intensity, shortens and takes off the sand time, avoids pearlife and flies upward, and improves working environment quality, improves the security for taking off sand.

Description

Ice chest pearlife takes off sand device and method
Technical field
The present invention relates to deep cooling heat preservation technology fields more particularly to a kind of ice chest pearlife to take off sand device and method.
Background technology
Ice chest be it is a kind of efficiently, the cryogenic heat exchange equipment of cold insulation, during cryogenic separation pass through frequently with.Pearlife Because it has the characteristics that capacity is small, thermal conductivity factor is low, chemical stability is good, non-ignitable, nontoxic, tasteless, sound absorption properties are good, extensive use In ice chest heat preservation.
In the prior art, when ice chest failure, the method that generally use is manually removed claws pearlife from ice chest.People Work is taken off sand and is had the following disadvantages:First, pearlife has very strong mobility, easily buries staff, staff takes off There are life dangers during sand;Second, the pearlife of the interior filling of ice chest is more, and the personnel labor intensity taken off needed for sand is big;The Three, when manually taking off sand, pearlife flies upward and swims in ambient air, and operating environment is poor, and the respiratory health of operating personnel can not Ensure;4th, the time manually taken off needed for sand is longer, and the liquid oxygen or nitrogen when taking off sand for a long time in ice chest, which have gasification suddenly, leads The problem of causing explosion, causes equipment breakdown, casualties.
Therefore, it is necessary to solve above-mentioned technical problem.
The content of the invention
The present invention provides a kind of ice chest pearlife and takes off sand device and method, to solve problems of the prior art, drop Low labor intensity, shortening take off the sand time, pearlife are avoided to fly upward, and improve working environment quality, improve the security for taking off sand.
The present invention provides a kind of ice chest pearlifes to take off sand device, the pearly-lustre including ice chest and in the ice chest Sand further includes:Surge tank, sand inlet and air inlet are offered on the surge tank, and the air inlet is higher than the sand inlet;It takes out Suction pipe, the suction tube include pump orifice and sand export, and the sand export is connected with the sand inlet, and the pump orifice is worn In pearlife in ice chest;Aspirator, the aspirator is connected with the air inlet to be made to generate negative pressure in the surge tank, The pearlife is entered by the suction tube in the surge tank under suction function.
Optionally, the ice chest pearlife takes off sand device and further includes drill bit, and suction sand hole, the suction are offered on the drill bit The outlet of sand hole is connected with the pump orifice.
Optionally, the shape of the drill bit is taper, and the outlet for inhaling sand hole is positioned at the bottom surface of the drill bit, the suction The entrance of sand hole is located at the side of the drill bit.
Optionally, the mouth of falling sand is offered in the bottom wall of the surge tank.
Optionally, the ice chest pearlife takes off sand device and further includes down sandpipe and connect sand device, and the mouth of falling sand connects with described Sand device is connected by the sandpipe.
Optionally, it is provided with gate valve on the sandpipe.
Optionally, the quantity of the suction tube is multiple that multiple sand inlets are offered on the side wall of the surge tank, Multiple pump orifices are respectively positioned in the pearlife, and multiple sand exports connect correspondingly with multiple sand inlets It connects.
Optionally, the suction tube is hose.
Based on same inventive concept, the present invention also provides a kind of ice chest pearlifes to take off sand method, by above-described Ice chest pearlife takes off sand device and carries out taking off sand, including:The blanket gas of ice chest is switched into air;Pump orifice on suction tube is put It is placed in pearlife;Opening aspirator makes to generate negative pressure in surge tank, so that the pearlife in ice chest is entered by suction tube In surge tank.
Optionally, further include and be passed through air into the ice chest, the atmospheric pressure value in the ice chest is made to be more than the surge tank Interior atmospheric pressure value.
Ice chest pearlife provided by the invention takes off sand device and method, by the swabbing action of aspirator, in surge tank Negative pressure is generated, the pearlife in ice chest is driven to be directly entered the inside of surge tank from suction tube, realizes and quickly takes off sand, compared with It is of the prior art manually to take off sand, it avoids pearlife and flies upward and float in air, improve working environment quality, shorten The sand time is taken off, reduces labor intensity, improves security.
Description of the drawings
Preferred embodiment in the present invention will be described in detail by attached drawing below, it will help understand the purpose of the present invention and excellent Point, wherein:
Fig. 1 is the structure diagram that the ice chest pearlife that the preferred embodiment of the present invention provides takes off sand device.
Fig. 2 is the flow chart that the ice chest pearlife that the preferred embodiment of the present invention provides takes off sand method.
Specific embodiment
It mentions in the present specification or up, down, left, right, before and after, front, the back side, top, the bottom that may mention etc. Orientation term is defined compared with each attached construction shown in figure, and word " interior " and " outer " refer respectively to direction or remote They are opposite concepts for direction from particular elements geometric center, and it is therefore possible to can be according to its residing different position, difference Use state and correspondingly changed.So also these or other orientation term should not be construed to restricted use Language.
Fig. 1 is the structure diagram that the ice chest pearlife that the preferred embodiment of the present invention provides takes off sand device, as shown in Figure 1, The present invention provides a kind of ice chest pearlifes to take off sand device, pearlife, surge tank 1, pumping including ice chest, in the ice chest Suction pipe 2 and aspirator 3.
It refer to Fig. 1, surge tank 1 offers sand inlet and air inlet 11 on the surge tank 1, and the air inlet 11 is high In the sand inlet;Suction tube 2, the suction tube 2 include pump orifice 21 and sand export 22, the sand export 22 with it is described into sand Mouth is connected, and the pump orifice 21 is arranged in the pearlife in ice chest (in the layer of sand where pearlife);The aspirator 3 with The air inlet 11, which is connected, to be made to generate negative pressure in the surge tank 1, and the pearlife is straight by suction tube 2 under suction function The inside into surge tank 1 is tapped into, pearlife is avoided and flies upward and swim in air, improve working environment quality, shorten and take off The time required to sand, compared to manually sand is taken off, labor intensity is reduced, improves security.Wherein aspirator 3 can be exhaust fan Either air-introduced machine for aspirating air, generates subnormal ambient in surge tank 1 and suction tube 2.
Ice chest pearlife provided in an embodiment of the present invention takes off sand device, by the swabbing action of aspirator 3, in surge tank 1 Interior generation negative pressure drives the pearlife in ice chest to be directly entered the inside of surge tank 1 from suction tube 2, realizes and quickly takes off sand, phase Sand manually is taken off for of the prior art, pearlife is avoided and flies upward and swim in air, improve working environment quality, is shortened The sand time is taken off, labor intensity is reduced, improves security.
Optionally, the ice chest pearlife takes off sand device and further includes drill bit 4, and suction sand hole is offered on the drill bit 4, described The entrance for inhaling sand hole is located at the surface of the drill bit 4, and the outlet for inhaling sand hole is connected with the pump orifice 21.Drill bit 4 Weight is larger, and drill bit 4 can utilize the inside of own wt insertion pearlife, and outlet of the pump orifice 21 with inhaling sand hole is connected, It ensure that normal pumping sand.
It is preferred that the shape of the drill bit 4 is tapered, the outlet for inhaling sand hole is positioned at the bottom surface of the drill bit 4.It is tapered Drill bit 4 can further improve drill bit 4 be inserted into pearlife in depth, improve take out sand efficiency.Optionally, sand hole is inhaled Entrance could be provided as multiple, and multiple entrances for inhaling sand holes are arranged on the conical surface of drill bit 4 and work together, and sand effect is taken out to improve Rate.
Optionally, the mouth of falling sand 12 is offered in the bottom wall of the surge tank 1.It is pumped to from suction tube 2 in surge tank 1 Pearlife can by the mouth of falling sand 12 directly under the effect of gravity discharge surge tank 1 in, avoid pearlife heap in surge tank 1 Product, it is convenient and efficient.
Further, the ice chest pearlife takes off sand device and further includes down sandpipe 5 and connect sand device 7, the mouth of falling sand 12 and The sand device 7 that connects is connected by the sandpipe 5.By falling the drainage of sandpipe 5, the pearlife inside surge tank 1 is directly arranged To connecing in sand device 7, be conducive to centralized collection pearlife.
Optionally, it is provided with gate valve 6 on the sandpipe 5.The aperture of gate valve 6 is adjustable, by adjusting gate valve 6 Aperture can adjust the quantity of the negative pressure value and pearlife in surge tank 1.3 preliminary work of aspirator, gate valve 6 are in what is closed State, so as to generate the environment of negative pressure in surge tank 1;After the pearlife of the bottom of surge tank 1 accumulation covers the mouth of falling sand 12, Gate valve 6 is opened, discharges pearlife in time, gate valve 6 is closed when being covered in the negligible amounts of pearlife of the mouth of falling sand 12, is kept away Exempt from air from sandpipe 5 to enter in surge tank 1, to maintain the subnormal ambient inside surge tank 1.
It is preferred that the quantity of the suction tube 2 is multiple, offered on the side wall of the surge tank 1 multiple described into sand Mouthful, multiple pump orifices 21 are respectively positioned in the pearlife, and multiple sand exports 22 and multiple sand inlets one are a pair of It should ground connection.Multiple suction tubes 2 can parallel operation simultaneously, take off the efficiency of sand to improve.It is preferred that multiple suction tubes 2 along The short transverse spread configuration of the ice chest, ice chest are generally up to four, 50 meters and successively set platform, be all provided with for every layer on ice chest It puts and takes off Sha Kou, surge tank 1 and aspirator 3 can be provided on the corresponding platform of every layer of ice chest, every layer has suction tube 2 to extend Pearlife is aspirated in into ice chest, pearlife greatly improved takes off sand efficiency.
Optionally, the suction tube 2 is hose, and hose has the advantages of flexibility is good, good-extensibility, with pearlife The propulsion of sand process is taken off, the upper level of pearlife reduces, and hose can continue into pearlife under the affecting of drill bit 4 Inside improves the convenient degree for taking off sand.Further, hose can be the translucent plastic tube for having some strength, be convenient for The suction conditions of pearlife in suction tube 2 are observed, hose can be connected with surge tank 1 by screw thread or quick coupling, with Improve efficiency.
Fig. 2 Fig. 2 is the flow chart that the ice chest pearlife that the preferred embodiment of the present invention provides takes off sand method.
As shown in Fig. 2, the present invention also provides a kind of ice chest pearlifes to take off sand method, pass through above-described ice chest pearly-lustre Sand takes off sand device and carries out taking off sand, including:The blanket gas of ice chest is switched into air;Pump orifice 21 on suction tube 2 is positioned over In pearlife;Opening aspirator 3 makes bad student's negative pressure in surge tank 1, delays so that the pearlife in ice chest is entered by suction tube 2 It rushes in tank 1.By the above method, inside of the pearlife in ice chest from suction tube 2 into surge tank 1 is driven, is realized quick Sand is taken off, manually sand is taken off compared with of the prior art, pearlife is avoided and flies upward floating in air, improve working environment matter Amount, shortens and takes off the sand time, reduce people and taking off risk present in sand, avoid when taking off sand because there may be liquid in ice chest Oxygen or nitrogen gasify phenomenon suddenly or pearlife makes moist hardened and casualties, property loss accident occurs.Reduce labor intensity, Improve security.
Further, further include and be passed through air into the ice chest, the atmospheric pressure value in the ice chest is made to be more than the buffering Atmospheric pressure value in tank 1, the atmospheric pressure value in ice chest is higher, the inside for the suction tube 2 that Pipe deformation atmospheric pressure value can be driven relatively low, Improve the efficiency of the suction of suction tube 2.
Ice chest pearlife provided in an embodiment of the present invention takes off sand device and method, by the swabbing action of aspirator 3, slow It rushes and negative pressure is generated in tank 1, the pearlife in ice chest is driven to be directly entered the inside of surge tank 1 from suction tube 2, realizes and quickly takes off Sand manually takes off sand compared with of the prior art, avoids pearlife and fly upward and float in air, improve working environment matter Amount, shortens and takes off the sand time, reduce labor intensity, improve security.
Finally it should be noted that:The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations;Although The present invention is described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that:It still may be used To modify to the technical solution recorded in foregoing embodiments or carry out equivalent substitution to which part technical characteristic; And these modifications or replacement, the essence of appropriate technical solution is not made to depart from the scope of various embodiments of the present invention technical solution.

Claims (10)

1. a kind of ice chest pearlife takes off sand device, the pearlife including ice chest and in the ice chest, which is characterized in that It further includes:
Surge tank, sand inlet and air inlet are offered on the surge tank, and the air inlet is higher than the sand inlet;
Suction tube, the suction tube include pump orifice and sand export, and the sand export is connected with the sand inlet, the suction Mouth is arranged in the pearlife in ice chest;
Aspirator, the aspirator is connected with the air inlet to be made to generate negative pressure in the surge tank, and the pearlife is negative Pressure effect is lower to be entered by the suction tube in the surge tank.
2. ice chest pearlife according to claim 1 takes off sand device, which is characterized in that the ice chest pearlife takes off sand device Drill bit is further included, suction sand hole is offered on the drill bit, the outlet for inhaling sand hole is connected with the pump orifice.
3. ice chest pearlife according to claim 2 takes off sand device, which is characterized in that the shape of the drill bit is taper, Positioned at the bottom surface of the drill bit, the entrance for inhaling sand hole is located at the side of the drill bit for the outlet for inhaling sand hole.
4. ice chest pearlife according to claim 1 takes off sand device, which is characterized in that in the bottom wall of the surge tank Offer the mouth of falling sand.
5. ice chest pearlife according to claim 4 takes off sand device, which is characterized in that the ice chest pearlife takes off sand device It further includes down sandpipe and connects sand device, the mouth of falling sand is connected with the sand device that connects by the sandpipe.
6. ice chest pearlife according to claim 5 takes off sand device, which is characterized in that is provided with plate on the sandpipe Valve.
7. the ice chest pearlife according to claim 1-6 any one takes off sand device, which is characterized in that the suction tube Quantity is multiple, multiple sand inlets is offered on the side wall of the surge tank, multiple pump orifices are respectively positioned on the pearl In light sand, multiple sand exports are connected correspondingly with multiple sand inlets.
8. the ice chest pearlife according to claim 1-6 any one takes off sand device, which is characterized in that the suction tube is Hose.
9. a kind of ice chest pearlife takes off sand method, which is characterized in that passes through the ice chest pearly-lustre described in claim 1-8 any one Sand takes off sand device and carries out taking off sand, including:
The blanket gas of ice chest is switched into air;
Pump orifice on suction tube is positioned in pearlife;
Opening aspirator makes to generate negative pressure in surge tank, so that the pearlife in ice chest is entered by suction tube in surge tank.
10. ice chest pearlife according to claim 9 takes off sand method, which is characterized in that further includes and leads into the ice chest Enter air, the atmospheric pressure value in the ice chest is made to be more than the atmospheric pressure value in the surge tank.
CN201711344881.9A 2017-12-15 2017-12-15 Ice chest pearlife takes off sand device and method Pending CN108100675A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201711344881.9A CN108100675A (en) 2017-12-15 2017-12-15 Ice chest pearlife takes off sand device and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201711344881.9A CN108100675A (en) 2017-12-15 2017-12-15 Ice chest pearlife takes off sand device and method

Publications (1)

Publication Number Publication Date
CN108100675A true CN108100675A (en) 2018-06-01

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Family Applications (1)

Application Number Title Priority Date Filing Date
CN201711344881.9A Pending CN108100675A (en) 2017-12-15 2017-12-15 Ice chest pearlife takes off sand device and method

Country Status (1)

Country Link
CN (1) CN108100675A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110026018A (en) * 2019-04-08 2019-07-19 黄莹 A kind of air separation pearlife suction unit, monitoring system and repair method
CN110553153A (en) * 2019-09-26 2019-12-10 武汉钢铁集团鄂城钢铁有限责任公司 Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking
CN115504114A (en) * 2022-10-29 2022-12-23 中石化中原石油工程设计有限公司 Sand pulling device and method for suspended ceiling normal-pressure storage tank

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CN101962125A (en) * 2010-11-04 2011-02-02 南京顺风气力输送系统有限公司 Positive and negative pressure integrated storehouse pump
CN201935524U (en) * 2010-03-24 2011-08-17 河北钢铁股份有限公司邯郸分公司 Perlite scraping device of improved large air separation plant
CN202744011U (en) * 2012-08-02 2013-02-20 广州雅顺金属表面处理机械有限公司 Vacuum sand suction machine
CN204223827U (en) * 2014-11-04 2015-03-25 罗斯(无锡)设备有限公司 Dump tank vacuum intaking device
JP2015229531A (en) * 2014-06-03 2015-12-21 Ihi運搬機械株式会社 Pneumatic unloader
CN205634189U (en) * 2016-04-28 2016-10-12 池州灵芝化建材料科技有限公司 Powder negative pressure automatic feeding device

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Publication number Priority date Publication date Assignee Title
CN201935524U (en) * 2010-03-24 2011-08-17 河北钢铁股份有限公司邯郸分公司 Perlite scraping device of improved large air separation plant
CN101962125A (en) * 2010-11-04 2011-02-02 南京顺风气力输送系统有限公司 Positive and negative pressure integrated storehouse pump
CN202744011U (en) * 2012-08-02 2013-02-20 广州雅顺金属表面处理机械有限公司 Vacuum sand suction machine
JP2015229531A (en) * 2014-06-03 2015-12-21 Ihi運搬機械株式会社 Pneumatic unloader
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN110026018A (en) * 2019-04-08 2019-07-19 黄莹 A kind of air separation pearlife suction unit, monitoring system and repair method
CN110553153A (en) * 2019-09-26 2019-12-10 武汉钢铁集团鄂城钢铁有限责任公司 Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking
CN110553153B (en) * 2019-09-26 2020-09-29 宝武集团鄂城钢铁有限公司 Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking
CN115504114A (en) * 2022-10-29 2022-12-23 中石化中原石油工程设计有限公司 Sand pulling device and method for suspended ceiling normal-pressure storage tank

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Application publication date: 20180601

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