CN1515393A - Nitrogen gas circulating superhigh molecular weight polyethylene steam pipe rotary drying method - Google Patents
Nitrogen gas circulating superhigh molecular weight polyethylene steam pipe rotary drying method Download PDFInfo
- Publication number
- CN1515393A CN1515393A CNA031144527A CN03114452A CN1515393A CN 1515393 A CN1515393 A CN 1515393A CN A031144527 A CNA031144527 A CN A031144527A CN 03114452 A CN03114452 A CN 03114452A CN 1515393 A CN1515393 A CN 1515393A
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- Prior art keywords
- nitrogen
- scrubbing tower
- enters
- steam
- separator
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- 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.)
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- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 title claims abstract description 113
- 238000001035 drying Methods 0.000 title claims abstract description 45
- 229910001873 dinitrogen Inorganic materials 0.000 title claims abstract description 9
- 239000004698 Polyethylene Substances 0.000 title 1
- -1 polyethylene Polymers 0.000 title 1
- 229920000573 polyethylene Polymers 0.000 title 1
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 52
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000004699 Ultra-high molecular weight polyethylene Substances 0.000 claims abstract description 12
- 229920000785 ultra high molecular weight polyethylene Polymers 0.000 claims abstract description 12
- 239000000428 dust Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims abstract description 9
- 229920010741 Ultra High Molecular Weight Polyethylene (UHMWPE) Polymers 0.000 claims abstract description 5
- 238000005201 scrubbing Methods 0.000 claims description 26
- 150000002829 nitrogen Chemical class 0.000 claims description 6
- 238000009834 vaporization Methods 0.000 claims description 6
- 230000008016 vaporization Effects 0.000 claims description 6
- 238000007791 dehumidification Methods 0.000 claims description 5
- 239000000470 constituent Substances 0.000 claims description 4
- 241000282326 Felis catus Species 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 7
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000004880 explosion Methods 0.000 abstract description 4
- 238000010438 heat treatment Methods 0.000 abstract description 3
- 238000000926 separation method Methods 0.000 abstract 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract 2
- 239000000843 powder Substances 0.000 description 8
- 239000007789 gas Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005200 wet scrubbing Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
Landscapes
- Drying Of Solid Materials (AREA)
Abstract
The present invention relates to a nitrogen gas circulation ultrahigh molecular weight polyethylene (UHMWPE) steam pipe rotary drying method, i.e. in the closed steam pipe rotary drying technology a nitrogen gas circulation system is added, and the processes of washing, nitrogen gas-water separation, cooling nitrogen gas-water separation and nitrogen gas supercharging and heating, etc. are used to make the wet conent of the material be reached to below 0.15% (dry basis), and it can effectively resolve the dust explosion hidden peril of UHMWPE open-circuit drying system.
Description
Technical field
The present invention relates to the powder drying technical field, especially a kind of nitrogen circulation ultra-high molecular weight polyethylene (UHMWPE) steam pipe rotary drying method.
Background technology
Molecular weight is that the ultra-high molecular weight polyethylene (UHMWPE) of 100-600 ten thousand has outstanding impact resistance, environmental stress crack resistance, wearability, self lubricity, can be used as the gear mechanism parts, the material of equipment liner, the pump housing and valve body, joint prosthesis and high-strength light fiber etc. becomes the up-and-coming youngster in the engineering plastics.
But traditional drying means is to be the open circuit fluidized bed drying of drying medium with the hot-air in the UHMWPE production technology, wet stock joins in the fluidized bed dryer through charging valve, be recycled hot gas ebullated drying, the fine granules that fluid bed hot gas is carried secretly is after the I and II cyclone separator separates, return fluidized bed dryer, enter air-flow with material in the bed by discharge valve and carry workshop section, finish the drying of powder.This drying means belongs to hot blast type drying.As second auxiliary factory, Beijing UHMWPE device drying technology process, the problem of its existence has: 1. the dust of UHMWPE powder has explosivity, and in the open circuit drying process, the UHMWPE powder contacts fully with hot-air, and burning and blast happen occasionally.2. compare hot blast type energy consumption for drying height with the heat-conduction-type drying.
Content of the present invention
Purpose of the present invention aims to provide a kind of nitrogen circulation ultra-high molecular weight polyethylene steam pipe rotary drying method, promptly in airtight steam pipe rotary drying technology, incorporate nitrogen circulating system, its by the washing, nitrogen---moisture from, the cooling, nitrogen---moisture from, nitrogen supercharging, heating process has been realized low temperature, the low humidity of circulating nitrogen gas having reduced nitrogen use level, improve drying efficiency, solved UHMWPE open circuit drying system dust explosion accident potential effectively.
The object of the present invention is achieved like this:
Ultra-high molecular weight polyethylene (UHMWPE) wet stock adds from the steam-tube rotatory dryer feed end, at thermal medium---under the indirect of steam, wet part of vaporization, the drying of realization material.Enter drying machine from about 100 ℃ of hot nitrogens of drying system from the discharge end of steam pipe rotary dryer, discharge, the fugitive constituent of material vaporization in the drying is carried out drying machine, about 80 ℃ of the outlet temperature of nitrogen from the feed end of steam-tube rotatory dryer.
The wet nitrogen that carries dust enters scrubbing tower, removes dust, is also lowered the temperature, and reduces the moisture that carries in the nitrogen.
The nitrogen that scrubbing tower is discharged enters first separator and deviates from moisture in the nitrogen.
The nitrogen that scrubbing tower is discharged enters condenser, and nitrogen is carried out cool-down dehumidification.
The washings of scrubbing tower are the circulation closed-circuit system, and circulating pump is sent washings into the cat head that enters scrubbing tower after cooler cools off at the bottom of tower, and the material that scrubbing tower reclaims enters knockout drum by the scrubbing tower overflow mechanism.
The nitrogen that condenser is discharged is again through second separator, and circulating nitrogen gas becomes 5 ℃ saturated nitrogen.5 ℃ saturated nitrogen pressurizes through air blast, and nitrogen heater is heated to about 100 ℃, enters from the discharge end of steam-tube rotatory dryer, recycles.
Wet part that the two-stage separator is discharged is converged in hermetically sealed can, enters in the scrubbing tower to recycle again; Be provided with nitrogen simultaneously in the first separator exit and replenish mouth, be used for replenishing the loss of nitrogen.
The present invention compared with prior art, the advantage and the beneficial effect that have are:
1, the present invention proposes the closed circuit nitrogen circulation steam pipe of UHMWPE powder rotary drying method, solve the dust explosion accident potential of traditional UHMWPE powder open circuit fluidized bed drying system effectively, adopted the steam pipe rotary drying to shorten drying technology process simultaneously;
2, the present invention adopts the wet scrubbing process for cooling, has both solved the dirt plug in the nitrogen circulation process, has realized the washing and the cooling of nitrogen again.
3, the present invention compares with the open circuit fluid bed drying process, has improved product appearance, has guaranteed the purity of product, and operating cost reduces by 50%, relatively the seeing the following form of its drying mode, technological process, Technological Economy:
| The present invention | Traditional drying technology | |
| Drying mode | Closed circuit nitrogen circulation steam pipe rotary drying | Open circuit air heat fluidized bed drying |
| Technological process | Nitrogen washing---moisture from, cool nitrogen---moisture is from, nitrogen supercharging, heating process | Hot gas ebullated, I and II separates |
| Product quality | Free from admixture, good quality of product | Because of air carries impurity, influence product quality |
| Processing safety | Do not have | Partial combustion or explosion accident occurred repeatedly, there is potential safety hazard in production |
| Public work consumes | : the heat that 47.45KW is required: 229055Kcal/h nitrogen: 50Nm 3/h | : the heat 450715Kcal/h that 140KW is required |
| Operating cost | : 18.80 (unit/ton product) steam: 24.50 (unit/ton product) nitrogen: 9.00 (unit/ton product) operating cost adds up to: 52.30 (unit/ton products) | : 55.48 (unit/ton product) steam: 48.20 (unit/ton product) operating cost adds up to: 103.68 (unit/ton products) |
Description of drawings
Fig. 1, process chart of the present invention
The specific embodiment
In conjunction with the accompanying drawings the present invention is described in further detail again
The UHMWPE wet stock adds from steam-tube rotatory dryer 1 inlet side, at thermal medium---under the indirect of steam, wet part of vaporization.Enter drying machine from 100 ℃ of hot nitrogens of system from the discharge end of steam-tube rotatory dryer 1, discharge, the fugitive constituent of material vaporization in the dry run is carried out drying machine, realize the drying of material from the feed end of steam-tube rotatory dryer 1.When powder left steam-tube rotatory dryer 1, moisture content reached below 0.15% (butt), becomes qualified products.The nitrogen that enters drying system is closed cycle, and its effect is the fugitive constituent that carries out material in the drying machine.Because after hot nitrogen enters steam-tube rotatory dryer 1, participate in heat transfer, the mass transfer of material dry run, make and take sparkling temperature reduction, the temperature outlet of nitrogen is 80 ℃, the wet nitrogen that carries powder enters scrubbing tower 2, and the function of scrubbing tower 2 is to carry out wet scrubbing to handle, when circulating nitrogen gas is removed dust in scrubbing tower 2, also lowered the temperature, carried moisture in the nitrogen thereby reduced.The nitrogen that scrubbing tower 2 is discharged enters first separator 3, and the function of separator is the moisture content of deviating from the nitrogen, and promptly dehumidification is handled.The nitrogen that scrubbing tower 2 is discharged enters condenser 8, and the function of condenser 8 is that nitrogen is carried out cool-down dehumidification.The washings of scrubbing tower 2 are circulation closed-circuit system at the bottom of the tower, and circulating pump 10 is sent washings into the cat head that enters scrubbing tower 2 after cooler 7 cools off at the bottom of tower.The material that scrubbing tower 2 reclaims enters knockout drum 6 by the scrubbing tower overflow mechanism.After the 4 further dehumidification demists of second separator were handled, circulating nitrogen gas became 5 ℃ saturated nitrogen to the nitrogen that condenser 8 is discharged again.5 ℃ saturated nitrogen is heated to 100 ℃ through nitrogen heater 9 after air blast 11 pressurization, enter from the discharge end of steam-tube rotatory dryer 1, recycles.Wet part that first separator 3 and second separator 4 are discharged is converged in hermetically sealed can 5, enters in the scrubbing tower 2 to recycle again.Be provided with nitrogen simultaneously in first separator, 3 exits and replenish mouth, be used for replenishing the loss of nitrogen.
Claims (1)
1, a kind of nitrogen circulation ultra-high molecular weight polyethylene steam pipe rotary drying method the steps include:
1. ultra-high molecular weight polyethylene (UHMWPE) wet stock adds from steam-tube rotatory dryer (1) feed end, at thermal medium---under the indirect of steam, wet part of vaporization; Enter drying machine from about 100 ℃ of hot nitrogens of system from the discharge end of steam pipe rotary dryer (1), discharge from the feed end of steam-tube rotatory dryer (1), the fugitive constituent of material vaporization in the dry run is carried out drying machine (1), about 80 ℃ of the outlet temperature of nitrogen;
2. the wet nitrogen that carries dust enters scrubbing tower (2), removes dust, is also lowered the temperature, and reduces the moisture that carries in the nitrogen;
3. scrubbing tower (2) nitrogen of discharging enters first separator (3) and deviates from moisture in the nitrogen.
4. the nitrogen of scrubbing tower (2) discharge enters condenser (8), and nitrogen is carried out cool-down dehumidification.
5. the washings of scrubbing tower (2) are the circulation closed-circuit system, circulating pump (10) is sent washings into the cat head that enters scrubbing tower (2) after cooler (7) cools off at the bottom of tower, the material that scrubbing tower (2) reclaims enters knockout drum (6) by scrubbing tower (2) overflow mechanism;
6. the nitrogen of condenser (8) discharge is again through second separator (4), and circulating nitrogen gas becomes 5 ℃ saturated nitrogen;
7. 5 ℃ saturated nitrogen is heated to about 100 ℃ through nitrogen heater (9) after air blast (11) pressurization, enters from the discharge end of steam-tube rotatory dryer (1), recycles;
8. wet part of the discharge of separator (3) and separator (4) is converged in hermetically sealed can (5), enters in the scrubbing tower (2) to recycle again; Be provided with nitrogen simultaneously in first separator (3) exit and replenish mouth, be used for replenishing the loss of nitrogen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031144527A CN100368169C (en) | 2003-01-10 | 2003-01-10 | Nitrogen gas circulating superhigh molecular weight polyethylene steam pipe rotary drying method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031144527A CN100368169C (en) | 2003-01-10 | 2003-01-10 | Nitrogen gas circulating superhigh molecular weight polyethylene steam pipe rotary drying method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1515393A true CN1515393A (en) | 2004-07-28 |
| CN100368169C CN100368169C (en) | 2008-02-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031144527A Expired - Lifetime CN100368169C (en) | 2003-01-10 | 2003-01-10 | Nitrogen gas circulating superhigh molecular weight polyethylene steam pipe rotary drying method |
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| CN (1) | CN100368169C (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100400996C (en) * | 2006-07-19 | 2008-07-09 | 山东天力干燥设备有限公司 | Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology |
| CN100422677C (en) * | 2006-05-19 | 2008-10-01 | 登封电厂集团铝合金有限公司 | Pulverized coal drying process and apparatus |
| CN101896324A (en) * | 2007-12-18 | 2010-11-24 | 波利亚里斯技术有限公司 | Removing volatile compounds from polymer pellets |
| CN102997619A (en) * | 2011-09-17 | 2013-03-27 | 天华化工机械及自动化研究设计院有限公司 | Nitrogen closed cycle drying method and device for drying polyacrylonitrile |
| CN102992934A (en) * | 2011-09-17 | 2013-03-27 | 天华化工机械及自动化研究设计院有限公司 | Nitrogen closed-loop cyclic regeneration type propylene dehydration method and device |
| CN103505893A (en) * | 2012-06-25 | 2014-01-15 | 天华化工机械及自动化研究设计院有限公司 | Method for removing odors of high-density polyethylene food-grade special material |
| CN103884154A (en) * | 2014-04-02 | 2014-06-25 | 山东宝莫生物化工股份有限公司 | Fluidized bed cooling and dehumidification cold air system |
| CN104848655A (en) * | 2015-06-02 | 2015-08-19 | 天华化工机械及自动化研究设计院有限公司 | Method for drying closed circulation fluidized beds by aid of nitrogen and polyethylene with ultrahigh molecular weight |
| CN105352268A (en) * | 2015-12-02 | 2016-02-24 | 杭州良盛机械有限公司 | Liquid drying and recovery system |
| CN107449264A (en) * | 2017-09-15 | 2017-12-08 | 四川宏图普新微波科技有限公司 | A kind of polytetrafluoroethyldispersion dispersion resin particle wet feed drying system and method |
| CN111854373A (en) * | 2020-07-27 | 2020-10-30 | 山东天力能源股份有限公司 | Ammonium chloride closed cycle drying system and process |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102072634B (en) * | 2010-12-29 | 2012-07-18 | 洁星环保科技投资（上海）有限公司 | Closed circulating drying equipment and drying process for protective gas |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA2129451C (en) * | 1992-12-18 | 1999-04-06 | Arnulf Lorenz | Methods and devices for purifying polyolefin |
| DE4319828A1 (en) * | 1993-06-16 | 1994-12-22 | Henkel Kgaa | Modified drying process using superheated steam in the drying medium and its application |
| DE19729302A1 (en) * | 1997-07-09 | 1999-01-14 | Basf Ag | Deodorising of freshly cut polypropylene chips |
| JP2002053672A (en) * | 2000-08-04 | 2002-02-19 | Toray Ind Inc | Gas treatment device for resin chip |
| CN2499212Y (en) * | 2001-06-18 | 2002-07-10 | 大庆石油化工设计院 | Nitrogen gas drying device for ABS powder material |
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2003
- 2003-01-10 CN CNB031144527A patent/CN100368169C/en not_active Expired - Lifetime
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN100422677C (en) * | 2006-05-19 | 2008-10-01 | 登封电厂集团铝合金有限公司 | Pulverized coal drying process and apparatus |
| CN100400996C (en) * | 2006-07-19 | 2008-07-09 | 山东天力干燥设备有限公司 | Nitrogen circulating coal powder air flow internal heating fluidized bed drying technology |
| CN101896324A (en) * | 2007-12-18 | 2010-11-24 | 波利亚里斯技术有限公司 | Removing volatile compounds from polymer pellets |
| CN101896324B (en) * | 2007-12-18 | 2013-04-10 | 波利亚里斯技术有限公司 | Removing volatile compounds from polymer pellets |
| CN102997619A (en) * | 2011-09-17 | 2013-03-27 | 天华化工机械及自动化研究设计院有限公司 | Nitrogen closed cycle drying method and device for drying polyacrylonitrile |
| CN102992934A (en) * | 2011-09-17 | 2013-03-27 | 天华化工机械及自动化研究设计院有限公司 | Nitrogen closed-loop cyclic regeneration type propylene dehydration method and device |
| CN103505893A (en) * | 2012-06-25 | 2014-01-15 | 天华化工机械及自动化研究设计院有限公司 | Method for removing odors of high-density polyethylene food-grade special material |
| CN103505893B (en) * | 2012-06-25 | 2015-01-21 | 天华化工机械及自动化研究设计院有限公司 | Method for removing odors of high-density polyethylene food-grade special material |
| CN103884154A (en) * | 2014-04-02 | 2014-06-25 | 山东宝莫生物化工股份有限公司 | Fluidized bed cooling and dehumidification cold air system |
| CN103884154B (en) * | 2014-04-02 | 2016-03-23 | 山东宝莫生物化工股份有限公司 | Fluid bed cool-down dehumidification quenching system |
| CN104848655A (en) * | 2015-06-02 | 2015-08-19 | 天华化工机械及自动化研究设计院有限公司 | Method for drying closed circulation fluidized beds by aid of nitrogen and polyethylene with ultrahigh molecular weight |
| CN105352268A (en) * | 2015-12-02 | 2016-02-24 | 杭州良盛机械有限公司 | Liquid drying and recovery system |
| CN107449264A (en) * | 2017-09-15 | 2017-12-08 | 四川宏图普新微波科技有限公司 | A kind of polytetrafluoroethyldispersion dispersion resin particle wet feed drying system and method |
| CN107449264B (en) * | 2017-09-15 | 2023-05-26 | 四川宏图普新微波科技有限公司 | Polytetrafluoroethylene dispersion resin particle wet material drying system and method |
| CN111854373A (en) * | 2020-07-27 | 2020-10-30 | 山东天力能源股份有限公司 | Ammonium chloride closed cycle drying system and process |
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| Publication number | Publication date |
|---|---|
| CN100368169C (en) | 2008-02-13 |
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Assignee: NANJING TIANHUA CHEMICAL ENGINEERING Co.,Ltd. Assignor: Lanzhou Ruide Drying Technology Co.,Ltd. Contract record no.: 2011320000615 Denomination of invention: Nitrogen gas circulating superhigh molecular weight polyethylene steam pipe rotary drying method Granted publication date: 20080213 License type: Exclusive License Open date: 20040728 Record date: 20110420 |
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Owner name: TIANHUA INSTITUTE OF CHEMICAL MACHINERY + AUTOMATI Free format text: FORMER OWNER: RUIDE DRYING TECHNOLOGY CO., LTD., LANZHOU Effective date: 20121018 |
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Effective date of registration: 20121018 Address after: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Patentee after: Tianhua Institute of Chemical Machinery and Automation Address before: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Patentee before: Lanzhou Ruide Drying Technology Co.,Ltd. |
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Owner name: TIANHUA INSTITUTE OF CHEMICAL MACHINERY + AUTOMATI Free format text: FORMER NAME: TIANHUA INSTITUTE OF CHEMICAL MACHINERY AND AUTOMATION |
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Address after: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Patentee after: TIANHUA INSTITUTE OF CHEMICAL MACHINERY AND AUTOMATION Co.,Ltd. Address before: 730060 Gansu city of Lanzhou province Xigu District Heshui Road No. 3 Patentee before: Tianhua Institute of Chemical Machinery and Automation |
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