CN104338719A - Liquid sodium metal ISO storage tank cleaning process - Google Patents
Liquid sodium metal ISO storage tank cleaning process Download PDFInfo
- Publication number
- CN104338719A CN104338719A CN201410462076.6A CN201410462076A CN104338719A CN 104338719 A CN104338719 A CN 104338719A CN 201410462076 A CN201410462076 A CN 201410462076A CN 104338719 A CN104338719 A CN 104338719A
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- Prior art keywords
- storage tank
- liquid metal
- sodium
- metal sodium
- iso
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/0804—Cleaning containers having tubular shape, e.g. casks, barrels, drums
- B08B9/0808—Cleaning containers having tubular shape, e.g. casks, barrels, drums by methods involving the use of tools, e.g. by brushes, scrapers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto
- B08B9/08—Cleaning containers, e.g. tanks
- B08B9/46—Inspecting cleaned containers for cleanliness
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Cleaning In General (AREA)
Abstract
The invention relates to a cleaning process of a liquid sodium metal ISO storage tank. The method is characterized by comprising the following steps: firstly, continuously filling nitrogen into a liquid metal sodium ISO storage tank to be cleaned to form micro positive pressure in the storage tank, then coating No. 15 industrial white oil on sodium slag on the inner wall of the storage tank for soaking and protection, finally cleaning the storage tank by using a tool, and passing a water pressure resistance test. The cleaning process for the liquid metal sodium ISO storage tank uses an air pick and nitrogen to clean the metal sodium in the liquid metal sodium ISO storage tank, and removes water through constant-temperature vacuum heating. The process of the invention uses the nitrogen pneumatic pick to clean the liquid sodium storage tank, has the characteristics of high safety, low cost and the like, and ensures the product quality of the liquid sodium. The test and the cleaning prove that the cleaning process can completely meet the requirement of a 5-year hydrostatic test ISO liquid sodium storage tank, thereby improving the recovery rate of the metal sodium and prolonging the service life of the ISO liquid sodium storage tank.
Description
Technical field
The present invention relates to a kind of liquid metal sodium ISO storage tank cleaning technique.
Background technology
In recent years, along with the development of society, the main flow consciousness that creation environment is friendly, resources saving enterprise has been economic development instantly.Metal sodium production industry uses the ISO liquid sodium storage tank quantity of international ITCO tank case standard progressively to increase every year, and due to frequent use, cause liquid metal sodium to accumulate in tank bottom, this brings very big inconvenience for follow-up use, causes potential safety hazard in scale removal process to highlight.Characteristic between sodium metal and the international standard requirement to ISO storage tank thereof, finding the new method of cleaning ISO storage tank, mode and technique becomes the task of top priority.
Summary of the invention
The object of this invention is to provide a kind of liquid metal sodium ISO storage tank cleaning technique, the rate of recovery of sodium metal in liquid metal sodium ISO storage tank can be improved, extend the life cycle of liquid metal sodium ISO storage tank.
A kind of liquid metal sodium ISO storage tank cleaning technique, its special feature is, comprise the steps: first to be filled with nitrogen continuously to liquid metal sodium ISO storage tank for clearance, cause in storage tank and form pressure-fired, then smear 15# technical white oil to the sodium slag of reservoir walls to soak, protect, instrument is finally used to clean out, then after the withstand voltage seizure test of water is qualified.
Further, comprise the steps:
(1) manhole cover and the safety valve of liquid metal sodium ISO storage tank first at normal temperatures, is opened;
(2) pass into nitrogen and replace gas in liquid metal sodium ISO storage tank continuously, then under operating personnel, storage tank carries out cleaning work, specifically first brushing one deck 15# technical white oil in the liquid metal sodium ISO reservoir walls of residual sodium slag, leave standstill at least 48h, then sodium metal instruments all in liquid metal sodium ISO storage tank is removed clean;
(3) after, all inner tank wall cotton being soaked with paraffin oil is cleaned, then by the flange of liquid metal sodium ISO storage tank, manhole cover, take out sodium pipe, enter sodium pipe and all open, carry out the naturally outdoor placement of 24-48h;
(4) take angle valve and the safety valve of liquid metal sodium ISO storage tank apart, after liquid metal sodium ISO storage tank uncovered placement 48h, with dry towel, wiping is carried out, until wiped clean to wall, bottom in tank; Finally also detect with water and whether thoroughly clean out, after namely adding water should without anyly smoldering, Ignition Phenomena;
(5) detect qualified after, by flange, manhole cover, enter sodium pipe, take out sodium pipe, safety valve, angle valve recover, operation water does pressure-resistant treatments and whether there is leakage with checking, fresh water (FW) is discharged after confirming No leakage, the conduction oil being heated to 20 ~ 30 DEG C is passed into the chuck Inner eycle of liquid metal sodium ISO storage tank, open vacuum system to make in storage tank to be negative pressure state simultaneously, continue 48 ~ 72h thus take internal moisture away.
Whether qualifiedly before cleaning work, also detect air index in storage tank with portable hydrogen, oxygen detection instrument in step (2), be required to meet hydrogen < 4%, that oxygen > 19.5% is is qualified.
After passing into the circulating heat conduction oil of 20 ~ 30 DEG C in liquid metal sodium storage tank clamping sleeve in step (2) after cleaning work terminates, vacuum system is used to take moisture content away.
Instrument in step (2) refers to nitrogen pneumatic pick, copper shovel and wooden mallet.
What pass in step (2) is purity >=99.99%, the dew point nitrogen below-50 DEG C.
A kind of liquid metal sodium ISO storage tank cleaning technique of the present invention uses pneumatic pick and nitrogen to carry out clearing up the sodium metal in liquid metal sodium ISO storage tank, by constant-temperature vacuum heating removing moisture content.Present invention process uses nitrogen pneumatic pick cleaning liquid sodium storage tank, has security high, the features such as cost is low, ensures the product quality of liquid sodium.Prove through overtesting cleaning, adopt cleaning technology of the present invention to reach to reach completely the requirement of 5 years water pressure test ISO liquid sodium storage tanks, fill up the blank of domestic cleaning liquid metal sodium ISO storage tank, thus improve the sodium metal rate of recovery, extend the service life of ISO liquid sodium storage tank.
Detailed description of the invention
Embodiment 1:
1, preparation before cleaning:
Take ISO tank manhole for clearance and four angle valves and safety valve apart, the sodium on angle valve, safety valve, manhole cover is cleaned out, prevents angle valve, manhole cover is stained with the sodium moisture absorption and blasts.
By manhole and installation angle valve place, check in ISO tank have no-sundries, moisture absorption situation and obvious chemical reaction situation with flashlight by circular hole, after normal in confirmation tank, angle valve is installed, to turn on angle valve blind plate on plug or plug valve, connect 99.99% nitrogen tube with the pipe joint with flange, pipeline is provided with Pressure gauge.By the sodium metal nitrogen protection in ISO tank, prevent the moisture absorption from exploding.
Be filled with by the short circuit place of not installing angle valve that purity is 99.99%, the high pure nitrogen of dew point below-50 DEG C, cover manhole cover, micro-ly stay gap, gas in displacement tank, displacement 30min.Prevent the high pure nitrogen water content of use high, cause the sodium metal moisture absorption, blast, after displacement 30min, restricted clearance work permit card is handled according to " entering restricted clearance safety management specification " (Q/SY1242-2009), cleaning personnel wear dry cotton work clothes, footware and headgear by regulation, wear safety belt, safety rope, safety goggles, long tube respirator, portable hydrogen detector and portable oxygen detector.Prevent from producing electrostatic in scale removal process, hydrogen, oxygen detection instrument measure in tank that hydrogen is 3%, oxygen be 25% alarm is normal, clearing up personnel when not reporting to the police should stop operation immediately, withdraws from tank.
Cleaning personnel enter in tank and to smear in ISO tank skin sodium metal on the surface with 15# technical white oil, cover manhole, the plug installed on angle valve, after pressure filling in tank to pressure-fired, close nitrogen valve, soak 48h and clear up.
2, cleaning operation:
Soak 48h and open high pure nitrogen valve, carry out gas displacement to ISO tank, cleaning personnel wear appliances for labor protection, and undertaken into tank cleaning with 12V explosion-proof lamp by manhole, cleaning tool is copper shovel, wooden mallet, prevents ironware and ironware from knocking generation spark, ignites hydrogen in tank.Cleaning pot bottom sodium metal, transports outside tank by the sodium metal of cleaning in time, carries out security protection; Cleaning personnel, every 20min, change other cleaning personnel and clear up, pass into high pure nitrogen continuously in scale removal process; Hydrogen, oxygen detection instrument alarm in tank is normal, and clearing up personnel when not reporting to the police should stop operation immediately, leaves in tank.(with copper shovel and wooden mallet be prevent from producing electrostatic in scale removal process.)
After the complete liquidation of pot bottom sodium metal is clean, the sheet sodium at wall and top in cleaning tank.With being soaked with in the towel wiping tank of technical white oil, until wiped clean, close high pure nitrogen valve.Take other angle valve of ISO tank and safety valve apart, after ISO tank uncovered placement 4h, after labor protection articles for use are worn by operating personnel, with dry towel, wiping is carried out, until wiped clean to wall, bottom in tank.After confirming wiped clean, in tank, fill water, to be tested.
3, liquid metal sodium ISO storage tank cleaning, fullys meet international ITCO tank case handbook to the inspection technology requirement of ISO storage tank.
Embodiment 2:
(1) manhole cover and the safety valve of liquid metal sodium ISO storage tank first at normal temperatures, is opened;
(2) pass into nitrogen and replace gas in liquid metal sodium ISO storage tank continuously, then under operating personnel, storage tank carries out cleaning work, specifically first brushing one deck 15# technical white oil in the liquid metal sodium ISO reservoir walls of residual sodium slag, leave standstill 48h, then sodium metal instruments all in liquid metal sodium ISO storage tank is removed clean;
Before cleaning work, whether qualified also detect air index in storage tank with portable hydrogen, oxygen detection instrument, be required to meet hydrogen < 4%, that oxygen > 19.5% is is qualified.
Pass into the circulating heat conduction oil of 25 DEG C in liquid metal sodium storage tank clamping sleeve after cleaning work terminates after, vacuum system is used to take moisture content away.
Instrument refers to nitrogen pneumatic pick, copper shovel and wooden mallet.
What pass into is purity >=99.99%, the dew point nitrogen below-50 DEG C.
(3) after, all inner tank wall cotton being soaked with paraffin oil is cleaned, then by the flange of liquid metal sodium ISO storage tank, manhole cover, take out sodium pipe, enter sodium pipe and all open, carry out the naturally outdoor placement of 48h;
(4) take angle valve and the safety valve of liquid metal sodium ISO storage tank apart, after liquid metal sodium ISO storage tank uncovered placement 48h, with dry towel, wiping is carried out, until wiped clean to wall, bottom in tank; Finally also detect with water and whether thoroughly clean out, after namely adding water should without anyly smoldering, Ignition Phenomena;
(5) detect qualified after, by flange, manhole cover, enter sodium pipe, take out sodium pipe, safety valve, angle valve recover, operation water does pressure-resistant treatments and whether there is leakage with checking, fresh water (FW) is discharged after confirming No leakage, the conduction oil being heated to 25 DEG C is passed into the chuck Inner eycle of liquid metal sodium ISO storage tank, open vacuum system to make in storage tank to be negative pressure state simultaneously, continue 72h thus take internal moisture away.
Claims (6)
1. a liquid metal sodium ISO storage tank cleaning technique, it is characterized in that, comprise the steps: first to be filled with nitrogen continuously to liquid metal sodium ISO storage tank for clearance, cause in storage tank and form pressure-fired, then smear 15# technical white oil to the sodium slag of reservoir walls to soak, protect, instrument is finally used to clean out, then after the withstand voltage seizure test of water is qualified.
2. a kind of liquid metal sodium ISO storage tank cleaning technique as claimed in claim 1, is characterized in that, comprise the steps:
(1) manhole cover and the safety valve of liquid metal sodium ISO storage tank first at normal temperatures, is opened;
(2) pass into nitrogen and replace gas in liquid metal sodium ISO storage tank continuously, then under operating personnel, storage tank carries out cleaning work, specifically first brushing one deck 15# technical white oil in the liquid metal sodium ISO reservoir walls of residual sodium slag, leave standstill at least 48h, then sodium metal instruments all in liquid metal sodium ISO storage tank is removed clean;
(3) after, all inner tank wall cotton being soaked with paraffin oil is cleaned, then by the flange of liquid metal sodium ISO storage tank, manhole cover, take out sodium pipe, enter sodium pipe and all open, carry out the naturally outdoor placement of 24-48h;
(4) take angle valve and the safety valve of liquid metal sodium ISO storage tank apart, after liquid metal sodium ISO storage tank uncovered placement 48h, with dry towel, wiping is carried out, until wiped clean to wall, bottom in tank; Finally also detect with water and whether thoroughly clean out, after namely adding water should without anyly smoldering, Ignition Phenomena;
(5) detect qualified after, by flange, manhole cover, enter sodium pipe, take out sodium pipe, safety valve, angle valve recover, operation water does pressure-resistant treatments and whether there is leakage with checking, fresh water (FW) is discharged after confirming No leakage, the conduction oil being heated to 20 ~ 30 DEG C is passed into the chuck Inner eycle of liquid metal sodium ISO storage tank, open vacuum system to make in storage tank to be negative pressure state simultaneously, continue 48 ~ 72h thus take internal moisture away.
3. a kind of liquid metal sodium ISO storage tank cleaning technique as claimed in claim 2, it is characterized in that, whether qualifiedly to comprise the steps: in step (2) also to detect air index in storage tank with portable hydrogen, oxygen detection instrument before cleaning work, be required to meet hydrogen < 4%, that oxygen > 19.5% is is qualified.
4. a kind of liquid metal sodium ISO storage tank cleaning technique as claimed in claim 2, it is characterized in that: after passing into the circulating heat conduction oil of 20 ~ 30 DEG C in liquid metal sodium storage tank clamping sleeve in step (2) after cleaning work terminates, use vacuum system to take moisture content away.
5. a kind of liquid metal sodium ISO storage tank cleaning technique as claimed in claim 2, is characterized in that: the instrument in step (2) refers to nitrogen pneumatic pick, copper shovel and wooden mallet.
6. a kind of liquid metal sodium ISO storage tank cleaning technique as claimed in claim 2, is characterized in that: what pass in step (2) is purity >=99.99%, the dew point nitrogen below-50 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410462076.6A CN104338719B (en) | 2014-09-12 | 2014-09-12 | Liquid sodium metal ISO storage tank cleaning process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410462076.6A CN104338719B (en) | 2014-09-12 | 2014-09-12 | Liquid sodium metal ISO storage tank cleaning process |
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| CN104338719A true CN104338719A (en) | 2015-02-11 |
| CN104338719B CN104338719B (en) | 2016-08-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201410462076.6A Active CN104338719B (en) | 2014-09-12 | 2014-09-12 | Liquid sodium metal ISO storage tank cleaning process |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108305694A (en) * | 2017-12-20 | 2018-07-20 | 中国原子能科学研究院 | A kind of burst disc replacement technique for liquid metal sodium environment |
| CN112025122A (en) * | 2020-08-20 | 2020-12-04 | 衡阳华宏化工实业有限公司 | Welding maintenance method for concentrated sulfuric acid storage tank |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61197997A (en) * | 1985-02-28 | 1986-09-02 | Toshiba Corp | Cleaning device for sodium handling equipment |
| CN1586741A (en) * | 2004-08-10 | 2005-03-02 | 广州广万通石油设备技术有限公司 | Quick cleaning method for underground and ground oil storage tank |
| CN202498060U (en) * | 2012-03-14 | 2012-10-24 | 山东旭锐新材有限公司 | Fine sodium storage tank slag removal equipment |
| CN103100528A (en) * | 2013-02-06 | 2013-05-15 | 中国原子能科学研究院 | Process and system of cleaning and removing sodium |
-
2014
- 2014-09-12 CN CN201410462076.6A patent/CN104338719B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61197997A (en) * | 1985-02-28 | 1986-09-02 | Toshiba Corp | Cleaning device for sodium handling equipment |
| CN1586741A (en) * | 2004-08-10 | 2005-03-02 | 广州广万通石油设备技术有限公司 | Quick cleaning method for underground and ground oil storage tank |
| CN202498060U (en) * | 2012-03-14 | 2012-10-24 | 山东旭锐新材有限公司 | Fine sodium storage tank slag removal equipment |
| CN103100528A (en) * | 2013-02-06 | 2013-05-15 | 中国原子能科学研究院 | Process and system of cleaning and removing sodium |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108305694A (en) * | 2017-12-20 | 2018-07-20 | 中国原子能科学研究院 | A kind of burst disc replacement technique for liquid metal sodium environment |
| CN112025122A (en) * | 2020-08-20 | 2020-12-04 | 衡阳华宏化工实业有限公司 | Welding maintenance method for concentrated sulfuric acid storage tank |
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| Publication number | Publication date |
|---|---|
| CN104338719B (en) | 2016-08-17 |
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Address after: 750336 Helan District, Alashan Economic Development Zone, Alashan League, Inner Mongolia Autonomous Region Patentee after: China Salt Inner Mongolia Chemical Co.,Ltd. Address before: 750336 Ustin Economic Development Zone, Alxa League, Inner Mongolia Autonomous Region Patentee before: INNER MONGOLIA LANTAI INDUSTRIAL Co.,Ltd. |
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Effective date of registration: 20220402 Address after: 750336 south of Ulanbuhe street, Alxa Economic Development Zone, Alxa League, Inner Mongolia Autonomous Region (WuSitai town) Patentee after: INNER MONGOLIA LANTAI SODIUM INDUSTRY Co.,Ltd. Patentee after: China Salt Inner Mongolia Chemical Co.,Ltd. Address before: 750336 Helan District, Alashan Economic Development Zone, Alashan League, Inner Mongolia Autonomous Region Patentee before: China Salt Inner Mongolia Chemical Co.,Ltd. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 750336 south of Ulanbuhe street, Alxa Economic Development Zone, Alxa League, Inner Mongolia Autonomous Region (WuSitai town) Patentee after: China Salt Inner Mongolia Chemical sodium Industry Co.,Ltd. Patentee after: China Salt Inner Mongolia Chemical Co.,Ltd. Address before: 750336 south of Ulanbuhe street, Alxa Economic Development Zone, Alxa League, Inner Mongolia Autonomous Region (WuSitai town) Patentee before: INNER MONGOLIA LANTAI SODIUM INDUSTRY Co.,Ltd. Patentee before: China Salt Inner Mongolia Chemical Co.,Ltd. |