CN110553153B - Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking - Google Patents
Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking Download PDFInfo
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- CN110553153B CN110553153B CN201910917125.3A CN201910917125A CN110553153B CN 110553153 B CN110553153 B CN 110553153B CN 201910917125 A CN201910917125 A CN 201910917125A CN 110553153 B CN110553153 B CN 110553153B
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- cold box
- liquid
- sand
- leakage
- steel pipe
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Separation By Low-Temperature Treatments (AREA)
- Examining Or Testing Airtightness (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
Abstract
The invention relates to the technical field of air separation, in particular to a method for treating leakage of liquid nitrogen, liquid argon or liquid air in a cold box by local sand raking, which comprises the following steps: 1) searching a fault point, and analyzing the components of the leaked gas; 2) reducing the inflation pressure; 3) drilling a small hole to observe the internal condition and injecting a certain amount of water; 4) forming a circle of a plurality of holes on the periphery of the small hole according to the icing condition of the wall of the cold box, and inserting a steel pipe into the holes; 5) an inlet hole is formed in an area surrounded by the steel pipe, and a pipeline for exposing the solidified pearlife to leakage is drawn out; 6) after stopping and draining the liquid, the maintainers enter the space to perform leakage repairing operation; 7) testing pressure and checking leakage after the overhaul is finished, and sealing the port after no abnormity is confirmed; the invention has the advantages of local sand raking, saving manpower, material resources and financial resources, shortening the overhaul period and being particularly suitable for the fault treatment of the non-oxygen leakage cold box.
Description
Technical Field
The invention relates to the technical field of air separation, in particular to a method for treating leakage of liquid nitrogen, liquid argon or liquid air in a cold box by local sand raking.
Background
The air separation plant is equipped with a large-sized cold box, the height of the cold box is usually 60 meters, and the length and the width of the cold box are about 20 meters, and devices such as a main tower, a heat exchanger, a liquid pipeline, a gas pipeline, a valve, a measuring cylinder and the like are assembled inside the cold box. When the refrigerator works, the temperature in the cold box is usually about-170 ℃, heat preservation is carried out by using pearlife, and generally set oxygen production is 10000m34500 m is arranged in a cold box of the/h oxygen generator3Left and right pearlife heat-insulating materials. Once low-temperature gas or liquid leaks in the cold box, the oxygen measuring instrument can measure whether liquid air, liquid oxygen, liquid nitrogen or liquid argon leaks, the common method is that the cold box needs to be stopped, low-temperature liquid in the cold box is discharged according to regulations, then the cold box is kept still, the cold box is heated for about 48 hours, after the air separation equipment recovers to the normal temperature, all pearlifes in the cold box are completely removed, the pearlifes are swept out through a sweeping tower (the residual pearlifes are swept out to prevent the pearlifes from flying and obstructing the sight), then an inspection scaffold is erected in the cold box, low-pressure air or low-pressure nitrogen is filled into the air separation equipment, soap water on a human belt enters the air separation tower to check leakage one by one while pressure is maintained, fault points are found out in the tower, constructors enter the cold box again to perform leakage repairing treatment, the pearlifes are refilled after the treatment, the normal work is started, and a large amountThe maintenance period is about 20-30 days.
Disclosure of Invention
The invention aims to solve the problems that when leakage faults occur in the interior of the existing cold box, all pearlife needs to be scraped out, a large amount of manpower, material resources and financial resources are consumed, the construction period is long, and the production efficiency is influenced, and provides a method for locally scraping sand to treat leakage of liquid nitrogen, liquid argon or liquid air in the cold box.
The specific scheme of the invention is as follows: a method for treating leakage of liquid nitrogen, liquid argon or liquid air in a cold box by local sand raking comprises the following steps:
1) when the inside of the cold box leaks, the temperature measuring device is used for measuring the temperature of the outer wall of the cold box and looking up a relevant drawing of the structure inside the cold box to find a rough fault point, meanwhile, the gas composition leaked inside the cold box is analyzed, if the leaked gas composition is liquid nitrogen, liquid argon or liquid air, the subsequent steps are carried out, and if the leaked gas composition is liquid oxygen, the method is not adopted;
2) the cold box is inflated and closed to ensure that the inflation pressure of the space in the tower is less than 100Pa (relative pressure);
3) drilling a small hole DN8-DN12 near a fault point on the outer wall of the cold box, standing a person on the side of the small hole, wearing glasses and gauze kerchief to prevent the pearlife from being sprayed out to cause damage to constructors;
4) injecting a certain amount of water into the small hole after the internal condition of the cold box is detected, wherein the water is condensed in a low-temperature environment to solidify the pearl sand, so that the fluidity of the pearl sand is greatly reduced;
5) according to the icing condition on the wall of the cold box, drilling a circle of a plurality of holes along the periphery of the fault point, inserting a steel pipe with the length of 1.0-1.5m into each hole, and tightly inserting the inner end of each steel pipe into the pearlite sand;
6) forming an access hole in the outer wall of the cold box in the middle area surrounded by a circle of steel pipes, and digging out solidified pearl sand until a leaking pipeline is exposed (if the sand is still flowing, injecting a proper amount of water to reduce the fluidity);
7) stopping the cold box, discharging liquid, heating to normal temperature, detecting the oxygen content in the space, and when the oxygen content reaches the operating condition, entering a cold box by a maintainer to overhaul the leaked pipeline;
8) and after the overhaul is finished, carrying out pressure test and leakage detection on the cold box, and taking out the steel pipe and sealing the cold box after no abnormity is confirmed.
Furthermore, the wet cotton quilt is plugged while the pearly-luster sand is drawn out in the step 6), so that the wet cotton quilt and the steel pipe form a closed operation space to prevent sand above or on the left side and the right side from flowing into the operation space, and the steel pipe is taken out and sealed while the wet cotton quilt is taken out in the step 8).
Compared with the prior art, the invention has the following advantages: the leakage fault in the cold box can be processed only by local sand raking, so that the manpower, material resources and financial resources are saved, the overhaul period is greatly shortened, and meanwhile, the safety of maintainers and the safety of the cold box are ensured in the whole operation process.
Detailed Description
The embodiment is a method for treating leakage of liquid nitrogen, liquid argon or liquid air in a cold box by local sand raking, which comprises the following steps:
1) when the inside of the cold box leaks, the temperature measuring device is used for measuring the temperature of the outer wall of the cold box and looking up a relevant drawing of the structure inside the cold box to find a rough fault point, meanwhile, the gas composition leaked inside the cold box is analyzed, if the leaked gas composition is liquid nitrogen, liquid argon or liquid air, the subsequent steps are carried out, and if the leaked gas composition is liquid oxygen, the method is not adopted;
2) the cold box is inflated and closed to ensure that the inflation pressure of the space in the tower is less than 100Pa (relative pressure);
3) drilling a DN10 small hole near a fault point on the outer wall of the cold box, standing a person on the side of the small hole, wearing glasses and gauze kerchief, and preventing the pearl sand from spraying out to cause damage to constructors;
4) injecting a certain amount of water into the small hole after the internal condition of the cold box is detected, wherein the water is condensed in a low-temperature environment to solidify the pearl sand, so that the fluidity of the pearl sand is greatly reduced;
5) according to the icing condition on the wall of the cold box, drilling a circle of a plurality of DN45 holes along the periphery of a fault point, inserting a steel pipe with the length of 1.5m into each hole, and tightly inserting the inner end of each steel pipe into the pearlite sand;
6) the method comprises the following steps of (1) forming an access hole in the outer wall of a cold box in the middle area surrounded by a circle of steel pipes, digging out solidified pearlite until a leaked pipeline is exposed (if sand is found to still flow, a proper amount of water is injected to reduce the fluidity), and then plugging in a wet cotton quilt, wherein a little bit and a little bit are taken off because the pearlite is thin and light, and the wet cotton quilt and the steel pipes form a firm and reliable vacated space with tight periphery and little bit to prevent sand above or on the left side and the right side from flowing into an operation space;
7) stopping the cold box, discharging liquid, heating to normal temperature, detecting the oxygen content in the space, and when the oxygen content reaches the operating condition, entering a cold box by a maintainer to overhaul the leaked pipeline;
8) and after the overhaul is finished, carrying out pressure test and leakage detection on the cold box, taking out the steel pipe and sealing the cold box after no abnormity is confirmed, taking out the cotton quilt a little by a little, taking out the cotton quilt while gradually taking out the steel pipe and sealing the steel pipe, and strengthening monitoring by constructors and controlling the flying-out of the pearl sand.
9) And finally, supplementing the pearlife from the top of the cold box, wherein the pearlife sinks to fill the space which is taken out.
This embodiment is at the in-process that overhauls the back equipment of finishing heating, through opening big cold box inflation pressure, lets the moisture content of pouring into volatilize and discharge through cold box pressure release mouth, and the moisture of consequently pouring into can not cause the influence to the operation of equipment.
The method only needs to draw out about 1.5-2m3The maintenance period of the pearlife is not more than 48 hours.
Claims (2)
1. A method for processing leakage of liquid nitrogen, liquid argon or liquid air in a cold box by local sand raking is characterized by comprising the following steps: the method comprises the following steps:
1) when the inside of the cold box leaks, the temperature measuring device is used for measuring the temperature of the outer wall of the cold box and looking up a relevant drawing of the structure inside the cold box to find a rough fault point, meanwhile, the gas composition leaked inside the cold box is analyzed, if the leaked gas composition is liquid nitrogen, liquid argon or liquid air, the subsequent steps are carried out, and if the leaked gas composition is liquid oxygen, the method is not adopted;
2) the cold box is inflated and closed to ensure that the inflation pressure of the space in the tower is less than 100Pa relative pressure;
3) drilling a small hole DN8-DN12 near a fault point on the outer wall of the cold box, standing a person on the side of the small hole, wearing glasses and gauze kerchief to prevent the pearlife from being sprayed out to cause damage to constructors;
4) injecting a certain amount of water into the small hole after the internal condition of the cold box is detected, wherein the water is condensed in a low-temperature environment to solidify the pearl sand, so that the fluidity of the pearl sand is greatly reduced;
5) according to the icing condition on the wall of the cold box, drilling a circle of a plurality of holes along the periphery of a fault point, inserting a steel pipe with the length of 1.0-1.5m into each hole, and tightly inserting the inner end of each steel pipe into the pearlite sand;
6) forming an access hole in the outer wall of the cold box in the middle area surrounded by the circle of steel pipes, digging out solidified pearl sand until a leaked pipeline is exposed, and injecting a proper amount of water if the sand is still flowing so as to reduce the fluidity;
7) stopping the cold box, discharging liquid, heating to normal temperature, detecting the oxygen content in the space, and when the oxygen content reaches the operating condition, entering a cold box by a maintainer to overhaul the leaked pipeline;
8) and after the overhaul is finished, carrying out pressure test and leakage detection on the cold box, and taking out the steel pipe and sealing the cold box after no abnormity is confirmed.
2. The method for treating leakage of liquid nitrogen, liquid argon or liquid air in the cold box by local sand raking according to claim 1, which is characterized in that: and 6) digging out the pearly-luster sand and simultaneously plugging in the wet cotton quilt in the step 6), so that the wet cotton quilt and the steel pipe enclose a closed operation space to prevent the sand above or on the left side and the right side from flowing into the operation space, and 8) taking out the wet cotton quilt and simultaneously taking out the steel pipe and sealing the steel pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917125.3A CN110553153B (en) | 2019-09-26 | 2019-09-26 | Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910917125.3A CN110553153B (en) | 2019-09-26 | 2019-09-26 | Method for treating leakage of liquid nitrogen, liquid argon or liquid air in cold box by local sand raking |
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| CN110553153A CN110553153A (en) | 2019-12-10 |
| CN110553153B true CN110553153B (en) | 2020-09-29 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858684A (en) * | 2010-07-13 | 2010-10-13 | 中国化学工程第四建设公司 | Air separation cooling box layering haling method |
| CN103486433A (en) * | 2013-06-28 | 2014-01-01 | 苏州华福低温容器有限公司 | Method used for filling interlayer of cryogenic liquid storage tank with pearlife |
| CN108100675A (en) * | 2017-12-15 | 2018-06-01 | 神华集团有限责任公司 | Ice chest pearlife takes off sand device and method |
| CN110026018A (en) * | 2019-04-08 | 2019-07-19 | 黄莹 | A kind of air separation pearlife suction unit, monitoring system and repair method |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7340921B2 (en) * | 2004-10-25 | 2008-03-11 | L'Air Liquide - Société Anonyme à Directoire et Conseil de Surveillance pour l'Etude et l'Exploitation des Procédés Georges Claude | Cold box and cryogenic plant including a cold box |
-
2019
- 2019-09-26 CN CN201910917125.3A patent/CN110553153B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101858684A (en) * | 2010-07-13 | 2010-10-13 | 中国化学工程第四建设公司 | Air separation cooling box layering haling method |
| CN103486433A (en) * | 2013-06-28 | 2014-01-01 | 苏州华福低温容器有限公司 | Method used for filling interlayer of cryogenic liquid storage tank with pearlife |
| CN108100675A (en) * | 2017-12-15 | 2018-06-01 | 神华集团有限责任公司 | Ice chest pearlife takes off sand device and method |
| CN110026018A (en) * | 2019-04-08 | 2019-07-19 | 黄莹 | A kind of air separation pearlife suction unit, monitoring system and repair method |
Non-Patent Citations (3)
| Title |
|---|
| 大型空分设备检修实践;袁加宇;《深冷技术》;20080215;第22-25页 * |
| 对空分装置检修作业安全的探讨;李燕坡;《石油化工安全环保技术》;20120220;第28卷(第1期);第22-24页 * |
| 局部扒砂在28000 m~3/h空分设备冷箱内漏处理的应用;凌波等;《深冷技术》;20170430;第5-8页 * |
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Address after: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Applicant after: Baowu group Echeng Iron and Steel Co., Ltd Address before: No. 215, Wuchang Avenue, Hubei, Ezhou, Hubei Applicant before: WUHAN IRON AND STEEL GROUP ECHENG IRON AND STEEL Co.,Ltd. |
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Effective date of registration: 20211116 Address after: 436000 office building, Wuchang Avenue, Echeng District, Ezhou City, Hubei Province Patentee after: Baowu clean energy Ezhou Co., Ltd Address before: 436008 No. 215, Wuchang Avenue, Echeng District, Ezhou City, Hubei Province Patentee before: Baowu group Echeng Steel Co., Ltd |
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