CN104979051B - 66-500kV crosslinked cable short-degassing online treatment process - Google Patents
66-500kV crosslinked cable short-degassing online treatment process Download PDFInfo
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Abstract
The invention discloses a 66-500kV crosslinked cable short-degassing online treatment process. A process flow comprises conductor preparing; three-layer co-extruding and insulating and online degassing; and degassing in a drying room, wherein the step of three-layer co-extruding and insulating and online degassing specifically comprises three-layer co-extruding of a conductor shielding layer, an insulating layer and an insulating shielding layer; crosslinking; cooling; secondary heating; and cooling; the secondary heating is carried out under protection of nitrogen atmosphere, the nitrogen concentration of the nitrogen atmosphere is controlled over 98%, the nitrogen temperature is controlled at 220+/-5 DEG C, and the conductor temperature is controlled at 90 DEG C. According to the 66-500kV crosslinked cable short-degassing online treatment process disclosed by the invention, the insulating layer is not aged during degassing, the degassing rate is high, the byproduct removal effect is good, the degassing time of the drying room can be greatly shortened, the production period is shortened, and energy is saved and emission is reduced.
Description
Technical field
The present invention relates to a kind of crosslinked cable degasification technique, particularly to a kind of 66-500kV crosslinked cable short degassing online treatment technique.
Background technology
66kV-500kV high voltage power cable, its major insulation has by-product in cross-linking process and produces, and be present in insulation, has the biggest adverse effect to quality of insulation, and insulated wire cores needs to be de-gassed process under normal circumstances.Degassing time is the longest, and typically at 7 ~ 12 days, degassing temperature is 70 DEG C.The deficiency existed is: 1, degassing time is long, wastes the energy, and the production cycle is longer；2, degassing is to complete to carry out afterwards in insulation production, and the by-product of insulating inner is removed not exclusively；3, insulated wire cores the most easily occurs aging.
Summary of the invention
It is an object of the invention to provide a kind of 66-500kV crosslinked cable short degassing online treatment technique, insulating barrier does not haves catabiosis, and outgassing rate is high, and by-product removal effect is good, can be greatly shortened drying room degassing time, shortens the production cycle, energy-saving and emission-reduction.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of 66-500kV crosslinked cable short degassing online treatment technique, technological process includes: conductor → three-layer co-extruded insulation and online degassing → drying room degassing；Described three-layer co-extruded insulation and online de-airing step particularly as follows: conductor shield+insulating barrier+insulation screen three-layer co-extruded → crosslinking → cooling → post bake → cooling；Described post bake is carried out under nitrogen atmosphere is protected, and the nitrogen gas concn of nitrogen atmosphere controls more than 98%, and nitrogen temperature controls at 220 ± 5 DEG C, and conductor temperature controls at 90 DEG C.
The crosslinked polyetylene insulated cross-linking chemistry that completes in process of production reacts, and period has a certain amount of small molecule by-product and generates, and the composition of by-product mainly has water, methane, 1-Phenylethanone. and methyl styrene.
Insulation layer quality is had a significant impact by these cross-linking by-products, it is common that being de-gassed process in being placed directly in degassing drying room after insulated wire cores being cross-linked, owing to degassing time is longer, insulating barrier there will be catabiosis sometimes.
The present invention is to be de-gassed process (degassing online) in insulation production process, then places into drying room further degassing, shortens degassing time, improves quality of insulation.
By cross-linking step, can produce more by-product, now, these by-product overwhelming majority all can rest in insulating barrier, it is impossible to effusion.Cooling after crosslinking, can shape well to cable.But, the by-product that conventional direct drying room degassing rests in insulating barrier limits due to heated condition, is difficult to removing, needs long-time degassing.The present invention after the cooling period carry out post bake at line procedures, now can be heated to higher temperature, outgassing rate is fast, effective.Cooling and shaping is good, can be greatly shortened the time of follow-up drying room degassing.
The present invention online degasification technique method: being de-gassed process online has good gas shield environment, and under nitrogen protection, cable insulation at high temperature deaerates and do not haves aging, oxidative phenomena, and quality of insulation can be greatly improved.And routine technique degassing mainly carry out at drying room, do not have nitrogen protection environment, the most aging, and due to when drying room deaerates cable coiled; therefore, drying room degassing can not temperature the highest, the most not can exceed that 80 DEG C; otherwise, the easy softening transform of cable, largely effect on quality.
The present invention installs post bake system additional at cross-linking production line, carries out post bake process after insulated wire cores cooling, and now cable is not coiled heating-up temperature and can arrive more than the crystallization temperature of crosslinked polyethylene and reach 220 ± 5 DEG C, and such outgassing rate is soon, effective.Now, crosslinked polyethylene internal by-product under elastomeric state escapes insulation in gaseous form, reaches good degasifying effect.
The present invention is computer heating control independent to conductor during post bake, and temperature controls at 90 DEG C, and such by-product just will not remain in insulating inner, reaches the purpose thoroughly deaerated, and degassing efficiency is the highest.
The online walking speed of crosslinking and post bake process cable controls at 0.5-1m/min.
As preferably, described crosslinking is carried out under nitrogen atmosphere is protected, and the nitrogen gas concn of nitrogen atmosphere controls more than 98%, and nitrogen temperature controls at 340 DEG C, and conductor temperature controls at 150 DEG C.The present invention is computer heating control independent to conductor in cross-linking process, temperature controls at 150 DEG C, it is ensured that inside insulating barrier, middle part, the inside and outside degree of cross linking of outside degree of cross linking uniformity, only insulation uniform, by-product just will not remain in insulating inner, reaches the purpose thoroughly deaerated.
As preferably, in cross-linking process, the frequency of waste air is that every 20min arranges once, each 2s.
As preferably, described in be cooled under nitrogen atmosphere protection carrying out, the nitrogen gas concn of nitrogen atmosphere controls more than 98%, is cooled to 40 DEG C.
As preferably, post bake process maintains pressure at more than 10bar, and the frequency of post bake process control waste air is that every 8-10min arranges once, each 3-4s.
The present invention utilizes original cross-linking production line drainage, greatly changes process time and the frequency of blowdown, it is ensured that nitrogen gas concn in curing tube.Cross-linking by-products escapes in gaseous form, and its effusion efficiency has certain relation with nitrogen gas concn in curing tube, and after by-product escapes endlessly, the nitrogen gas concn in curing tube can reduce, and the by-product concentration within curing tube increases, and affects by-product and continues effusion.
Post bake process of the present invention maintains pressure at more than 10bar (more than 10 atmospheric pressure), the frequency of post bake process control waste air is that every 8-10min arranges once, each 3-4s, it is ensured that in curing tube, nitrogen gas concn keeps within the specific limits, by-product effusion is smooth and easy, and degasifying effect is good.
As preferably, the temperature of described drying room degassing controls at 70 DEG C ± 5 DEG C, degassing time: dielectric strength specification 110kV is 5 × 24h；: dielectric strength specification 220kV is 10 × 24h.By to crosslinking and the improvement of post bake operation, the time of drying room degassing can be greatly shortened.
The invention has the beneficial effects as follows: when the present invention deaerates, insulating barrier does not haves catabiosis, outgassing rate is high, and by-product removal effect is good, can be greatly shortened drying room degassing time, shortens the production cycle, energy-saving and emission-reduction.
Detailed description of the invention
Below by specific embodiment, technical scheme is described in further detail.
In the present invention, if not refering in particular to, the raw material used and equipment etc. are all commercially available or commonly used in the art.Method in following embodiment, if no special instructions, is the conventional method of this area.
Embodiment 1:
A kind of 66-500kV crosslinked cable short degassing online treatment technique, technological process includes: conductor → three-layer co-extruded insulation and online degassing → drying room degassing.Below as a example by rated voltage 110kV cable:
nullThree-layer co-extruded insulation and online de-airing step particularly as follows: conductor shield+insulating barrier+insulation screen three-layer co-extruded → crosslinking (carries out under nitrogen atmosphere is protected，The nitrogen gas concn of nitrogen atmosphere controls more than 98%，Nitrogen temperature controls at 340 DEG C，Conductor temperature controls at 150 DEG C，In cross-linking process, the frequency of waste air is that every 20min arranges once，2s every time) (nitrogen atmosphere is carried out under protecting in → cooling，The nitrogen gas concn of nitrogen atmosphere controls more than 98%，It being cooled to 40 DEG C) (nitrogen atmosphere is carried out under protecting → post bake，The nitrogen gas concn of nitrogen atmosphere controls more than 98%，Nitrogen temperature controls at 220 ± 5 DEG C，Conductor temperature controls at 90 DEG C，Post bake process maintains pressure at more than 10bar，The frequency of post bake process control waste air is that every 8min arranges once，3s every time.The online walking speed of post bake process cable controls at 1m/min, post bake passage length 20m) → cooling (carrying out under nitrogen atmosphere protection, the nitrogen gas concn of nitrogen atmosphere controls more than 98%, is cooled to 40 DEG C).
The temperature of described drying room degassing controls at 70 DEG C ± 5 DEG C, degassing time: 5 × 24h.
Through actually detected, in finished cable insulating barrier, without the micropore more than 0.02mm, (national standard requires: should be without the micropore more than 0.05mm in finished cable insulation, and more than 0.025mm, the micropore less than or equal to 0.05mm is converted to every 10cm3In volume, number cells should be less than 18), control indexes is far above national standard requirement, and test result is better than traditional handicraft.
Embodiment 2:
A kind of 66-500kV crosslinked cable short degassing online treatment technique, technological process includes: conductor → three-layer co-extruded insulation and online degassing → drying room degassing.Below as a example by rated voltage 220kV cable:
nullThree-layer co-extruded insulation and online de-airing step particularly as follows: conductor shield+insulating barrier+insulation screen three-layer co-extruded → crosslinking (carries out under nitrogen atmosphere is protected，The nitrogen gas concn of nitrogen atmosphere controls more than 98%，Nitrogen temperature controls at 340 DEG C，Conductor temperature controls at 150 DEG C，In cross-linking process, the frequency of waste air is that every 20min arranges once，2s every time) (nitrogen atmosphere is carried out under protecting in → cooling，The nitrogen gas concn of nitrogen atmosphere controls more than 98%，It being cooled to 40 DEG C) (nitrogen atmosphere is carried out under protecting → post bake，The nitrogen gas concn of nitrogen atmosphere controls more than 98%，Nitrogen temperature controls at 220 ± 5 DEG C，Conductor temperature controls at 90 DEG C，Post bake process maintains pressure at more than 10bar，The frequency of post bake process control waste air is that every 10min arranges once，4s every time.The online walking speed of post bake process cable controls at 0.5m/min, post bake passage length 20m) → cooling (carrying out under nitrogen atmosphere protection, the nitrogen gas concn of nitrogen atmosphere controls more than 98%, is cooled to 40 DEG C).
The temperature of described drying room degassing controls at 70 DEG C ± 5 DEG C, degassing time: 10 × 24h.
Through actually detected, without the micropore more than 0.02mm in finished cable insulating barrier, control indexes is far above national standard requirement, and test result is better than traditional handicraft.
Comparative example 1
As a example by rated voltage 110kV cable: 66-500kV crosslinked cable uses tradition degasification technique: conductor → three-layer co-extruded insulation (cross-links (high temperature, 97% nitrogen of 340 DEG C are protected) → cooling (40 DEG C, 97% nitrogen protection) → drying room degassing; the temperature of drying room degassing controls at 70 DEG C ± 5 DEG C, degassing time: 7 × 24h.Drying room degassing time is long, and insulating barrier is the most aging.Actually detected, without the micropore more than 0.025mm in finished cable insulation.
Comparative example 2
As a example by rated voltage 220kV cable: 66-500kV crosslinked cable uses tradition degasification technique: conductor → three-layer co-extruded insulation (cross-links (high temperature, 97% nitrogen of 340 DEG C are protected) → cooling (40 DEG C, 97% nitrogen protection) → drying room degassing; the temperature of drying room degassing controls at 70 DEG C ± 5 DEG C, degassing time: 14 × 24h.Drying room degassing time is long, and insulating barrier is the most aging.Actually detected, without the micropore more than 0.025mm in finished cable insulation.
When the present invention deaerates, insulating barrier does not haves catabiosis, and outgassing rate is high, and by-product removal effect is good, can be greatly shortened drying room degassing time, can shorten 2 ~ 3 days, shortens the production cycle, energy-saving and emission-reduction.
Embodiment described above is the one preferably scheme of the present invention, and the present invention not makees any pro forma restriction, also has other variant and remodeling on the premise of without departing from the technical scheme described in claim.
Claims (5)
1. a 66-500kV crosslinked cable short degassing online treatment technique, it is characterised in that technological process includes: conductor → three-layer co-extruded insulation and online degassing → drying room degassing；Described three-layer co-extruded insulation and online de-airing step particularly as follows: conductor shield+insulating barrier+insulation screen three-layer co-extruded → crosslinking → cooling → post bake → cooling；Described post bake is carried out under nitrogen atmosphere is protected, and the nitrogen gas concn of nitrogen atmosphere controls more than 98%, and nitrogen temperature controls at 220 ± 5 DEG C, and conductor temperature controls at 90 DEG C；In cross-linking process, the frequency of waste air is that every 20min arranges once, each 2s.
66-500kV crosslinked cable the most according to claim 1 short degassing online treatment technique; it is characterized in that: described crosslinking is carried out under nitrogen atmosphere is protected; the nitrogen gas concn of nitrogen atmosphere controls more than 98%, and nitrogen temperature controls at 340 DEG C, and conductor temperature controls at 150 DEG C.
66-500kV crosslinked cable the most according to claim 1 and 2 short degassing online treatment technique, it is characterised in that: twice cooling is all carried out under nitrogen atmosphere is protected, and the nitrogen gas concn of nitrogen atmosphere controls more than 98%, is cooled to 40 DEG C.
66-500kV crosslinked cable the most according to claim 1 and 2 short degassing online treatment technique, it is characterised in that: post bake process maintains pressure at more than 10bar, and the frequency of post bake process control waste air is that every 8-10min arranges once, each 3-4s.
66-500kV crosslinked cable the most according to claim 1 and 2 short degassing online treatment technique, it is characterised in that: the temperature of described drying room degassing controls at 70 DEG C ± 5 DEG C, degassing time: dielectric strength specification 110kV is 5 × 24h；Dielectric strength specification 220kV is 10 × 24h.
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| CN106128653A (en) * | 2016-08-15 | 2016-11-16 | 河南开启电力实业有限公司 | Medium and high voltage cable cross-linking production line depassing unit |
| CN109616262B (en) * | 2018-12-28 | 2019-12-13 | 杭州电缆股份有限公司 | High-speed production process of 64/110kV high-voltage cross-linked polyethylene insulated power cable |
| CN111961239A (en) * | 2020-07-23 | 2020-11-20 | 上海摩恩电气股份有限公司 | Method for enhancing insulation stability of crosslinked polyethylene insulated power cable |
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| CN1652262A (en) * | 2004-01-30 | 2005-08-10 | 特勒斯特两合公司 | Method and apparatus for manufacture of cables with peroxide cross-linked insulative or semi-conductive layers |
| CN101339828A (en) * | 2007-09-14 | 2009-01-07 | 朱水良 | Processing method of power cable |
| CN102426885A (en) * | 2011-04-26 | 2012-04-25 | 上海市电力公司 | Method for degassing flexible direct current transmission cable |
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| JP2011527088A (en) * | 2008-07-02 | 2011-10-20 | ダウ グローバル テクノロジーズ エルエルシー | Improved method for degassing cables |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1652262A (en) * | 2004-01-30 | 2005-08-10 | 特勒斯特两合公司 | Method and apparatus for manufacture of cables with peroxide cross-linked insulative or semi-conductive layers |
| CN101339828A (en) * | 2007-09-14 | 2009-01-07 | 朱水良 | Processing method of power cable |
| CN102426885A (en) * | 2011-04-26 | 2012-04-25 | 上海市电力公司 | Method for degassing flexible direct current transmission cable |
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