CN101256026A - Primary oil long-distance pipeline electric heating membrane safety heating system and construction method - Google Patents
Primary oil long-distance pipeline electric heating membrane safety heating system and construction method Download PDFInfo
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- CN101256026A CN101256026A CNA2007100641208A CN200710064120A CN101256026A CN 101256026 A CN101256026 A CN 101256026A CN A2007100641208 A CNA2007100641208 A CN A2007100641208A CN 200710064120 A CN200710064120 A CN 200710064120A CN 101256026 A CN101256026 A CN 101256026A
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Abstract
The invention relates to a crude oil long-distance pipeline electric heating membrane safe heating system for preventing coagulation when crude oil long-distance pipeline transport is stopped, and a construction method thereof is also disclosed. A rare earth electric heating membrane (3) is coated between a solvent-free liquid epoxy paint external anticorrosive layer (2) and solvent-free liquid epoxy paint waterproof layer (4), and an insulation resistance between the rear earth electric heating membrane (3) and a conduit is more than 400 M omega; the electric heating membrane (3) is disposed on the conduit as a plurality of heating units with identical intervals, an electrode (5) is provided at each of the two ends of each heating unit, the heating units are connected one by one in parallel by power supply lines (6), a set of buried transformer and rectifier is provided with each two heating units, output AC voltage is supplied to the heating units, and 220-1000V AC voltage is supplied by a power source which is connected to the a plurality of buried transformers in parallel. The inventive system is installed on crude oil long-distance pipeline enter-station segment, electric heating and thermal insulation when transport is stopped are performed when necessary, and requirement of buried crude oil conduits is satisfied substantially; the inventive system is provided with safety, reliability, a long service life and economy.
Description
Technical field
The present invention stops the primary oil long-distance pipeline electric heating membrane safety heating system and the construction method thereof of pipe with fixed attention when being the crude oil pipeline stopping transportation.Relate to the pipe-line system technical field.
Background technology
The hot output oil pipeline of the long distance of China's heavy caliber occupies crucial status in whole petroleum transportation pipeline, along with national economy is increasing to the dependence of oil, the security of oil transportation has occupied crucial status in whole oil transportation.Crude oil that China produces mostly is the content of wax or high viscosity heavy oil greatly, pipeline transportation all need adopt mode of heating to reduce viscosity and to prevent the event of running affairs with fixed attention, pipe temperature between pipeline heating website is along with the prolongation of distance constantly descends, in order to guarantee the safety of pipeline, inlet temperature remains on more than condensation point 3 degree always, pipe does not take place to coagulate though can keep a period of time (being 24 hours at present) when stopping transportation, but also there are two problems, the one, can not guarantee the safety of pipeline when longer in the time, the 2nd, for the temperature that guarantees inlet temperature pipeline when moving at ordinary times higher, waste a large amount of energy, consumed a large amount of fuel oil.
Though add pour-point depressant at the domestic waxy crude oil that carried out in recent years, heavy crude adopts technology such as dilution conveying, emulsification conveying, but also there is not fundamentally to solve the heating transportation problem of long distance pipeline, on promoting, technology also comes up against a series of problems simultaneously, therefore, on the most of crude oil pipeline of China, also will take to heat the method for operation of conveying.
The Electric radiant Heating Film heating technique is one of the highest mode of heating of the present efficiency of heating surface, and its main feature is the electric conversion efficiency height, and heat transfer area is big, and heating temp is low, long service life, and reliability and security are good.This technology belongs to the emerging technology in the electric-heating technology field, can be widely used in military project, petrochemical industry, building, machinery and field such as civilian.Just be useful at present the well head oil recovery of oil extraction and the oil inlet pipe Electric radiant Heating Film heating technique of burning former thermo oil boiler, and multinomial patent is arranged.But these technology only are applicable to several meters to tens meters short-range former oil pipe heating, and structure is also comparatively complicated.This special in picture for crude oil long-distance transmission pipeline, because generally speaking caliber is big, distance is long, bury on ground and the pipeline and all be added with cathodic protection system, these technology just can not be suitable for, so also do not apply to crude oil pipeline so far.
Summary of the invention
Prevent safe, reliable, the primary oil long-distance pipeline electric heating membrane safety heating system and the construction method thereof that efficient is high, economical of pipe with fixed attention when the objective of the invention is to invent a kind of crude oil pipeline stopping transportation.
Crude oil pipeline is followed inlet temperature always and is higher than the above regulation of condensation point of crude oil 3 degree in running, mainly be in order to ensure dying not taking place behind the pipeline shutdown to run affairs with fixed attention in a period of time.The danger of coagulating pipe mainly occurs in several kilometer range of the section of entering the station, if can the most dangerous pipeline section promptly the section of entering the station set in advance the heat tracing system, coagulating of dangerous pipeline section pipeline managed when stopping stopping transportation, security in the time of not only can improving stopping transportation, can when normal operation, reduce running temperature simultaneously, thereby reduce the operating cost of pipeline.
Though the Electric radiant Heating Film heating technique is a mature technique, application also has many problems that will solve on crude oil pipeline, closes problem as the lotus root of Electric radiant Heating Film and existing corrosion protection system, i.e. Electric radiant Heating Film oil transportation heat-insulation system does not cause negative effect to anticorrosion coating on pipeline; Bond strength between electric heating membrane insulated material and the corrosion-inhibiting coating meets the relevant requirements of national long distance pipeline standard; Use dc source to heat, the target protection does not impact; The construction technology problem of Electric radiant Heating Film coating in large-scale pipeline; To the requirement of the insulaion resistance between corrosion-inhibiting coating and the pipeline etc.
In view of this, this electric heating membrane safety heating system is that Electric radiant Heating Film 3 is coated between the external anti-corrosion layer 2 and watertight composition 4 of the segment pipe 1 that enters the station as shown in Figure 1; The equidistant segmentation of determining by required heating power on pipeline 1 is made as a heating unit, and each heating unit two ends is connected to electrode 5, connects to power supply.
Specifically be that rare earth Electric radiant Heating Film 3 is coated between the solvent-free liquid epoxy coating external anti-corrosion layer 2 and solvent-free liquid epoxy coating watertight composition 4 of the segment pipe 1 that enters the station, the insulaion resistance between rare earth Electric radiant Heating Film 3 and the pipeline 1 is more than 400M Ω; Electric radiant Heating Film 3 is made as a plurality of heating units equidistantly on pipeline 1, each heating unit two ends is connected to electrode 5, by power line 6 heating unit is connected in parallel in twos, ground transformer and rectifier one cover are buried in per two heating unit settings, output dc voltage is added on the heating unit, and main supply is connected with a plurality of ground transformers that bury of parallel connection.
The value of the length of one of them heating unit, institute's making alive and electric current, the heat that produces in Electric radiant Heating Film 3 guarantees that crude oil temperature is higher than under the prerequisite of 3 ℃ of condensation points in the crude oil pipeline, the caliber of based on crude pipeline, ground temperature, throughput rate, calculate the heat dissipation capacity in every mitron road, and then determine the compensation power in every mitron road; Value as for length, institute's making alive and the electric current of a heating unit, then can calculate the bulk resistor in every mitron road according to the conductivity meter of Electric radiant Heating Film 3, can select the value of length, institute's making alive and the electric current of a heating unit thus, generally speaking, the length of a heating unit is greatly about 50m-100m, institute's making alive is about 80-100V, and institute adds electric current and is about 100-150A.In fact compensation power can be adjusted at random by adjusting institute's making alive, to tackle the heating system that may change.
Wherein leave the gap between the Electric radiant Heating Film 3 of each heating unit, keep insulation each other, this gap is generally about 1 centimetre.
Wherein the electrode 6 at each heating unit two ends is a circular boop shape copper strips, is enclosed within on the pipeline 1 outer Electric radiant Heating Film 3 that applies fastening copper strips after adding one deck conductive silver paste between copper strips and the Electric radiant Heating Film 3.
Wherein main supply uses the power supply of 220-1000V alternating voltage, and burying the ground transformer is the Adjustable Output Voltage formula.
In order to guarantee the long-term safety operation of safe heating system, every 1km is provided with a measurement point on the pipeline 1 that the safety heating system is installed, the voltage of test safety heating system, resistance, insulation, oil temperature, ground temperature parameter testing, but in-site collecting parameter or carry out data by the teletransmission mode and transmit.
The principle of safe heating system
The defeated pipeline of long distance heat in order to guarantee flowing of pipeline PetroChina Company Limited., the most important thing is to guarantee the safety when pipeline shutdown in running, avoid taking place to run affairs with fixed attention so.Take to improve the way of oil temperature traditionally, the one, reduce viscosity, simultaneously the time in order to provide one to allow stopping transportation, the inlet temperature when pipeline normally moves must be higher than condensation point, and present standard is to be higher than more than 3 ℃.The temperature of several kilometers pipelines of the section of entering the station is minimum, the easiest pipeline section that coagulates pipe when also being stopping transportation.General several kilometers pipe temperatures before entering the station are only high about 1 ℃ than inlet temperature, if the electric heating thermal insulation system is installed in advance at this segment pipe, do not enable at ordinary times, when pipeline shutdown, utilize the power initiation heat-insulation system in station district, can guarantee the most dangerous pipeline of this section do not take place to run affairs with fixed attention so, prolonged the time of safe stopping transportation; And, because the generation of the event of can avoiding running affairs with fixed attention can suitably reduce running temperature when normal operation, save great amount of fuel oil, reduce operating cost.
Su Huofu equation according to the conveying of deep fat long distance pipeline: T
L=T
0+ (T
R-T
0) (3.14*D*K*L/G/C), the ground temperature value of different pipelines is a determined value to EXP, and the K value is 1.8w/m
2℃, station spacing also is a determined value,, 2100KJ/Kg ℃ of crude oil specific heat capacity C value is so can calculate the decline situation of pipe temperature under different tube diameters, the different throughput rate.Consider that pipeline oil transportation has for many years until old formed the ground temperature field-effect, and pipeline latter end temperature difference is less, calculates, just can calculate every mitron road heat dissipation capacity according to cooling back pipe temperature and ground temperature.The compensation heat transmits to pipeline and soil both direction, so heat dissipation capacity was calculated by 1: 1.1, is easy to calculate the compensation power in every mitron road and total compensation power of a heating unit so.Get final product the value of length, institute's making alive and the electric current of a heating unit of choose reasonable thus.
Electric radiant Heating Film 3 is the planar functional materials of thin layer that a kind ofly overlayed on the insulating body, can generate heat after the energising, is the abbreviation of membranaceous electric heating function material, and its thicknesses of layers is generally below the millimeter.Membranaceous electric heating function element generally is made up of electric heating function film, electrode, matrix material three parts.The rare earth Electric radiant Heating Film is that a kind of conductive material, ceramic material and rare earth material with certain resistance formed, can cover the heating object all surfaces, heat transfer area is big, and under the energising situation, heat transfer rate is exceedingly fast, the thermal efficiency is high, and heating material this in when work, temperature is not high, does not have phenomenon such as rubescent, red-hot to produce yet, radiation loss is little, and is safe and reliable.
The construction method of this electric heating membrane safety heating system is: apply solvent-free liquid epoxy coating earlier outside the segment pipe 1 that enters the station, form insulating substrate, divide the heating unit of equidistant section to be coated to matrix surface electrothermal film material in epoxy coating external application spraying or brushing mode, spaced apart between section and the section, paste solid copper strips electrode 5 at the two ends of each heating unit, obtain the electroded Electric radiant Heating Film 3 of certain resistance value after the curing, after the interface between adjacent two sections Electric radiant Heating Film 3 uses the epoxy coating sealing, install the heat-shrinkable T bush sealing additional, after this apply at the solvent-free liquid epoxy coating of Electric radiant Heating Film 3 outer employings; Power line picks out from the electrode 6 of each heating unit, and the power line 6 of per two heating units also is attached to the output of rectifier, and the input of rectifier connects the output of transformer, and the input of a plurality of transformers also is attached to total AC power; Make the heating of just can switching on behind the electrode, carry out the surface insulation processing as required after after tested; Cathodic protection system is installed at last.
Specifically be outside the segment pipe that enters the station, to apply solvent-free liquid epoxy coating earlier, form the insulating substrate that thickness is not less than 400 μ m, divide the heating unit of equidistant section to be coated to matrix surface electrothermal film material in epoxy coating external application spraying or brushing mode, electric-heating coatings thickness is 150 ± 10 μ m, spaced apart between section and the section, be spaced apart about 1cm, width by the electrode copper strips is coated with one deck conductive silver paste at the two ends of heating unit immediately, copper strips electrode 5 cover is affixed on that the silver slurry is gone up and fastening, after the interface between adjacent two sections Electric radiant Heating Film 3 uses the epoxy coating sealing, installs the heat-shrinkable T bush sealing additional; After this outside Electric radiant Heating Film 3 and electrode copper strips, adopt solvent-free liquid epoxy coating to apply; Power line 6 picks out from the electrode 5 of each heating unit, and the power line 6 of per two heating units also is attached to the output of rectifier, and the input of rectifier connects the output of transformer, and the input of a plurality of transformers also is attached to total AC power; Main supply uses the power supply of 220-1000V alternating voltage, and ground transformer and rectifier one cover are buried in per two heating unit settings, its output dc voltage 80V-100V, and electric current 100A-150A, every transformer is two heating unit power supplies.Cathodic protection system is installed at last: for the magnesium anode protection system is to imbed after magnesium anode is soaked in water undergroundly, and lead and pipeline welding are connected to test pile from lead of pipe surface welding, and solder joint uses 100% epoxy coating to carry out insulation processing; For the then same standard practice of impressed current cathodic protection system.
When wherein heating unit electrode 5 is constructed, for can not guarantee air for a long time between electrode copper strips and the Electric radiant Heating Film 3, contact good, be affixed on the silver slurry and after fastening at copper strips electrode 5 cover, seal gap between copper strips and the Electric radiant Heating Film with epoxy coating immediately in advance, after this outside Electric radiant Heating Film 3 and electrode copper strips, together apply with solvent-free liquid epoxy coating again.
Wherein bury ground transformer and rectifier and be mounted in the ground well of Manhole cover with lock, the buried cable that connects to heating unit electrode 5 and AC power all overlaps the PVC sleeve pipe.
In order to guarantee construction quality, in Electric radiant Heating Film pipeline manufacturing process, need to test and the electric spark leak detection to the insulation between Electric radiant Heating Film 3 and the body, proceed after qualified; After Electric radiant Heating Film 3 outer layer insulations are made, insulating barrier is carried out the test of electric spark pin hole, detect again up to qualified after defective is repaired;
As seen, the present invention utilizes that electrothermal film technology is safe and reliable, long service life, characteristics that the thermal efficiency is high, through this construction method electric heating membrane safety heating system is installed in the crude oil pipeline section of entering the station, be in stand-by state for a long time, electrical heat tracing when carrying out stopping transportation in case of necessity, neither influence the cathodic protection of pipeline, anticorrosion coating on pipeline is not caused negative effect, bond strength between electric heating membrane insulated material and the corrosion-inhibiting coating meets the relevant requirements of national long distance pipeline standard, can satisfy fully and bury the ground environment requirement; But also safe and reliable, long service life, economy.
Description of drawings
Fig. 1 primary oil long-distance pipeline electric heating membrane safety heating system constitutes schematic diagram
1-pipeline 2-anticorrosive coat wherein
3-Electric radiant Heating Film 4-watertight composition
5-electrode 6-power line
The specific embodiment
Embodiment. also the present invention is further illustrated with this example the specific embodiment of the present invention to be described.This example is an Electric radiant Heating Film safety heating on-site testing system, is to carry out on the pipeline section that enters the station at the big line of iron station, and the caliber of this pipeline is Φ 720mm.The unit length power of electric heating membrane safety heating system is according to existing service data, and the consideration Northeast China oil has been moved more than 30 year, has formed more stable soil moisture field, and when pipeline shutdown, winter, ground 1.2m place ground temperature was decided to be 10 ℃, K value 1.8w/m
2℃, insulation power is 98.4w/m, Electric radiant Heating Film 3 adopts power line 6 to connect, DC power supply, give the switch board signal by the thermocouple assay terminal temperature, thereby the circuit output of control Electric radiant Heating Film heating system makes the minimum terminal pipe interior temperature of temperature be not less than setting value.
This experimental system and construction method are:
1. every section construction distance is 50m in construction, and the unsettled length of pipeline section is not more than 8m;
2. the construction Electric radiant Heating Film is finished one section of one section landfill, reduces the heat dissipation of pipeline loss;
3. derusting by sandblasting is carried out on pipeline 1 surface, reaches the Sa2.5 level, the dedusting of drying after qualified;
4. carry out liquid epoxy spraying, must be evenly during spraying, thickness is not less than 400 μ m;
5. carry out the electric spark leak detection, leak detection voltage 3kv;
6. carry out the spraying of rare earth Electric radiant Heating Film, electric-heating coatings thickness is 150 ± 10 μ m, carries out according to company standard;
7. power supply adopts ac power supply, and AC power is designed to 1000V/1000A, and the heating station point source can meet the demands at present, and cable uses twin-core waterproof copper core cable, and the cross-section of cable amasss 100mm
2
8. pipeline 1 every 50m is divided into a heating unit, and the joint adds the copper strips electrode with conductive silver paste and goes between, and is connected with cable with bolt, adopts above-mentioned cable to be connected in parallel between each unit, carries out water-proofing treatment then;
9. waterproof outer adopts liquid epoxy coating, and thickness is not less than 400 μ m;
10. every 1km is provided with a measurement point, parameters such as the voltage of test safety system, resistance, insulation; Oil temperature, ground temperature test can be carried out data by the teletransmission mode and transmit;
11. the every 100m of main supply coefficient is provided with the S11-MR type and buries one in ground transformer, degree of protection is IP68, can all be immersed in the water to move, and output voltage is 80V, electric current 150A, transformer buried depth 1.5m, two heating units of every transformer supply;
12. calculate according to every meter 98.4W, each heating unit electric current is 64.5A, uses 10mm
2Water-proof cable with bury ground transformer frequency response be connected;
13. the galvanic anode protection protecting system is installed: imbed underground 1.5 meters after magnesium anode is soaked in water, lead and pipeline welding are from 2.5mm of pipe surface welding
2Lead is connected to test pile, and solder joint uses 100% epoxy coating to carry out insulation processing, installs the back and uses digital multimeter to test;
14. Electric radiant Heating Film 3 and the test of ADHESION OF PAINTS power: test is according to GB/T9286-1998, and the result reaches one-level;
15. the test of Electric radiant Heating Film pipeline: in Electric radiant Heating Film pipeline manufacturing process, adopt megameter that the insulation between Electric radiant Heating Film 3 and the body is tested, insulaion resistance has all surpassed 500M Ω, the Electric radiant Heating Film coating resistance value of this use is 200 Ω, thickness is 150 μ m, when energising voltage was 300V, power was 1560W, can control the size of power by adjusting voltage; When the Electric radiant Heating Film outer layer insulation is made, insulating barrier has been carried out the test of electric spark pin hole, test voltage 8kV finds 47 of pin holes, repairs the back and detects up to free of pinholes;
16. system test: the Electric radiant Heating Film pipeline has been carried out heating and insulation test, pipeline shutdown, treat that oily temperature drops to 30 ℃ and starts heating system, be heated to 32 ℃ and be incubated, being warmed up to 33 ℃, 34 ℃ then is incubated, parameters such as record relevant temperature, power consumption are tested and record the galvanic anode protection protecting system;
17. the test of sacrificial anode system: the sacrificial anode system inspires confidence in anticorrosion scientific and technological development Co., Ltd by Qing Daohai to be provided, fitting depth is 1.5m, apart from pipeline 1m, protect voltage to be-1.20V after tested, Electric radiant Heating Film energising back test is-1.20V, adopt DC power supply, can not impact the galvanic anode protection protecting system of pipeline;
18. the applicability of system in burying the ground environment
Because the electrothermal film material ectonexine covers by epoxy coating, therefore mainly determine that by the performance of epoxy coating according to test, performance is as follows in the adaptability of burying the ground environment:
Impact strength (CSA/Z245.20-M98)
@25 ℃＞20 Jiao Er
@-30 ℃＞8 Jiao Er
Hardness of film (Shore D): 80+/-5
Cathodic disbonding (CSA/Z245.20-M98)
28 Tian @65 ℃:＜6 millimeters
28 Tian @80 ℃:＜6 millimeters
Chemical-resistance: after the immersion in 720 hours
Gasoline: no change
Kerosene: do not change
Salt solution: do not change
Solvent: do not change
Heat resistance: xeothermic
Continuity: 90 ℃
Discontinuity: 120 ℃
Salt spray test: 720 hours 1 coat@300 μ m
Surface corrosion: do not change
Sur-face peeling: do not change
Epoxy coating is a high-molecular organic material, has good waterproof and decay resistance, and electrothermal film material is had good protective effect.Epoxy coating has obtained application at PetroChina Company Limited.'s long-distance pipe, has stood the test of actual motion, is used in combination with organic polymer rare earth electrothermal film material, can satisfy and bury the ground environment requirement.
By above test and detection; insulation in this coefficient between Electric radiant Heating Film 3 and ADHESION OF PAINTS power, Electric radiant Heating Film 3 and the body, all can reach standard-required to the heating of pipeline 1 and insulation; the galvanic anode protection protecting system of 3 pairs of pipelines 1 of Electric radiant Heating Film can not impact, and can satisfy and bury the ground environment requirement.
Rare earth complex electrocaloric film oil pipeline safety heat-insulation system is exactly to utilize the electrical heat tracing of electrothermal film technology when the pipeline section of entering the station is carried out stopping transportation, does not move when normal oil transportation, utilizes this system held section of entering the station temperature under the stopping transportation situation, guarantees the safety of pipeline.Original power supply in this system utilization station district is connected with heating system, utilizes that Electric radiant Heating Film is safe and reliable, long service life, characteristics that the thermal efficiency is high be in stand-by state for a long time and kept by detection, and working service is simple, convenient, economical and practical.
Claims (8)
1. stop the primary oil long-distance pipeline electric heating membrane safety heating system of pipe with fixed attention during a crude oil pipeline stopping transportation, it is characterized in that rare earth Electric radiant Heating Film [3] is coated between the solvent-free liquid epoxy coating external anti-corrosion layer [2] and solvent-free liquid epoxy coating watertight composition [4] of the segment pipe that enters the station [1], the insulaion resistance between rare earth Electric radiant Heating Film [3] and the pipeline [1] is more than 400M Ω; Electric radiant Heating Film [3] goes up at pipeline [1] and is made as a plurality of heating units equidistantly, each heating unit two ends is connected to electrode [5], by power line [6] heating unit is connected in parallel in twos, ground transformer and rectifier one cover are buried in per two heating unit settings, output dc voltage is added on the heating unit, and main supply is connected with a plurality of ground transformers that bury of parallel connection.
2. primary oil long-distance pipeline electric heating membrane safety heating system according to claim 1 is characterized in that leaving the gap between the Electric radiant Heating Film [3] of each heating unit, keeps insulation each other, and this gap is generally about 1 centimetre.
3. primary oil long-distance pipeline electric heating membrane safety heating system according to claim 2 is characterized in that main supply uses the power supply of 220-1000V alternating voltage, and burying the ground transformer is the Adjustable Output Voltage formula.
4. the construction method of the primary oil long-distance pipeline electric heating membrane safety heating system of the described primary oil long-distance pipeline electric heating membrane safety heating system of claim 1, it is characterized in that outside pipeline [1], applying earlier solvent-free liquid epoxy coating, form insulating substrate, outside epoxy coating, divide the heating unit of equidistant section to be coated to matrix surface electrothermal film material, spaced apart between section and the section, immediately the copper strips electrode paste is fixed in every section two ends, obtain the electroded Electric radiant Heating Film of certain resistance value after the curing, after using the epoxy coating sealing, the interface between adjacent two sections Electric radiant Heating Film installs the heat-shrinkable T bush sealing additional, be connected in parallel with the electrode [5] of power line [6], after this apply at the solvent-free liquid epoxy coating of the outer employing of Electric radiant Heating Film [3] with per two heating units; Power line [6] picks out from the electrode [5] of each heating unit, and the power line of per two heating units [6] also is attached to the output of rectifier, and the input of rectifier connects the output of transformer, and the input of a plurality of transformers also is attached to total AC power; Make the heating of just can switching on behind the electrode, carry out the surface insulation processing as required after after tested; Cathodic protection system is installed at last.
5. the construction method of primary oil long-distance pipeline electric heating membrane safety heating system according to claim 4, it is characterized in that outside pipeline [1], applying earlier solvent-free liquid epoxy coating, form the insulating substrate that thickness is not less than 400 μ m, divide the heating unit of equidistant section to be coated to matrix surface electrothermal film material in epoxy coating external application spraying or brushing mode, electric-heating coatings thickness is 150 ± 10 μ m, spaced apart between section and the section, be spaced apart about 1cm, be coated with one deck silver slurry at the two ends of heating unit by the width of electrode copper strips immediately, copper strips electrode [5] cover is affixed on that the silver slurry is gone up and fastening, after the interface between adjacent two sections Electric radiant Heating Film [3] uses the epoxy coating sealing, installs the heat-shrinkable T bush sealing additional; After this outside Electric radiant Heating Film [3] and electrode copper strips, adopt solvent-free liquid epoxy coating to apply; Power line [6] picks out from the electrode [5] of each heating unit, and the power line of per two heating units [6] also is attached to the output of rectifier, and the input of rectifier connects the output of transformer, and the input of a plurality of transformers also is attached to total AC power; Main supply uses the power supply of 220-1000V alternating voltage, and ground transformer and rectifier one cover are buried in per two heating unit settings, its output dc voltage 80V-100V, and electric current 100A-150A, every transformer is two heating unit power supplies; Cathodic protection system is installed at last: for the magnesium anode protection system be imbed after magnesium anode is soaked in water underground, lead and pipeline [1] welding, be connected to test pile from lead of pipeline [1] surface soldered, solder joint uses 100% epoxy coating to carry out insulation processing; For the then same standard practice of impressed current cathodic protection system.
6. according to the construction method of claim 4 or 5 described primary oil long-distance pipeline electric heating membrane safety heating systems, when it is characterized in that heating unit electrode [5] construction, be affixed on the silver slurry and after fastening at the copper strips electrode sleeve, seal gap between copper strips and the Electric radiant Heating Film [3] with epoxy coating immediately in advance, after this outside Electric radiant Heating Film [3] and electrode copper strips, together apply with solvent-free liquid epoxy coating again.
7. according to the construction method of claim 4 or 5 described primary oil long-distance pipeline electric heating membrane safety heating systems, it is characterized in that burying ground transformer and rectifier and be mounted in the ground well of Manhole cover with lock, the ground power line [6] that buries that connects to heating unit electrode [5] and AC power all overlaps the PVC sleeve pipe.
8. according to the construction method of claim 4 or 5 described primary oil long-distance pipeline electric heating membrane safety heating systems, it is characterized in that in Electric radiant Heating Film pipeline manufacturing process, need to test and the electric spark leak detection, proceed after qualified the insulation between Electric radiant Heating Film [3] and the body; After Electric radiant Heating Film [3] outer layer insulation is made, insulating barrier is carried out the test of electric spark pin hole, detect again up to qualified after defective is repaired.
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| CN103136701A (en) * | 2011-11-25 | 2013-06-05 | 中国石油天然气股份有限公司 | Method for quantitatively evaluating pipe condensation probability of crude oil pipeline |
| CN103136701B (en) * | 2011-11-25 | 2017-07-14 | 中国石油天然气股份有限公司 | Pipe condensation probability of crude oil pipeline method for quantitatively evaluating |
| CN104790930A (en) * | 2015-04-15 | 2015-07-22 | 盘锦宏昌实业有限责任公司 | Thickened-oil step-lifting cable-free RC electric heating film heating oil extracting system |
| CN112903214A (en) * | 2021-01-12 | 2021-06-04 | 中国石油天然气股份有限公司 | Pipeline leakage point detection device and detection method |
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