CN106641721A - Constant-pressure start method for hot waxy crude oil pipeline - Google Patents
Constant-pressure start method for hot waxy crude oil pipeline Download PDFInfo
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- CN106641721A CN106641721A CN201510740670.1A CN201510740670A CN106641721A CN 106641721 A CN106641721 A CN 106641721A CN 201510740670 A CN201510740670 A CN 201510740670A CN 106641721 A CN106641721 A CN 106641721A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D1/00—Pipe-line systems
- F17D1/08—Pipe-line systems for liquids or viscous products
- F17D1/14—Conveying liquids or viscous products by pumping
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/01—Arrangements for supervising or controlling working operations for controlling, signalling, or supervising the conveyance of a product
Abstract
The invention discloses a constant-pressure start method for a hot waxy crude oil pipeline. When a pipeline system stopping transport starts again, a standby pump is connected in series into the oil pipeline and located at the downstream part of a main oil transport pump; the oil pipeline is provided with a buffer tank at the upstream part of the main oil transport pump, a circulating pipeline is arranged between the outlet of the final-stage oil transport pump, namely, the standby pump and the inlet of the buffer tank, and a branch flow regulating valve is arranged on the circulating pipeline; the opening of the branch flow regulating valve is regulated according to the change of the outlet pressure of the final-stage oil transport pump, so that crude oil flow passing the circulating pipeline is controlled, and the crude oil pipeline starts at a constant high pressure. The process is improved with the standby pump, and constant high pressure of the outer transport pipeline is kept in a start process, so that the transport stopping risk of the outer transport pipeline due to too high thixotropic pressure of the hot waxy crude oil in the start process is reduced.
Description
Technical field
The present invention relates to crude oil pipeline transport field, and in particular to a kind of startup method of hot waxy oil pipeline fast and stable under a constant.
Background technology
At present, the crude oil of Domestic Product about more than 80% is waxy crude oil.At home waxy crude oil yield continues to increase, and in the case of the demand continuation increasing to the energy, the defeated technique of pipe of waxy crude oil has important practical significance in the realization of the aspect such as safe transport, energy-saving.
Waxy crude oil is a kind of non-Newtonian thixotropic fluid, is characterized in that paraffin content is high, and condensation point is high, and density is relatively low, poor fluidity, and the property reduced with the prolongation of shearing force time with apparent viscosity.Therefore, generally, startup stage is conveyed in wax-containing oil pipe, oil transfer pump applies shearing force to pipeline inner wax crude oil, makes crude oil start flowing in pipeline.But due to the thixotropy of waxy crude oil, waxy crude oil forms packed structures in multi-purpose station pipeline, and flowing velocity is reduced, and now pressure increases suddenly in multi-purpose station pipeline.Subsequently due to the shear thinning behavior of waxy crude oil, the shear stress time increases, and waxy crude oil is accelerated to split drop, after yield limit is reached, normal fluid flow is slowly reverted to, so as to reduction multi-purpose station pipeline all fronts pressure, into normal stream state.
In crude pipeline transportation technique, there is provided the capital equipment of discharge pressure is main pump, usual one to open one standby.Due to the structural property of waxy crude oil, the pressure in multi-purpose station pipeline is set to increase in moment, not only result in main pump over-pressed, overheated, heat can not be evacuated in time, affect nucleus equipment service life, the outer defeated pressure instability of pipeline can be also caused, demand of the downstream user to fuel transfer pressure constant high-pressure is affected.
Focus mostly in terms of the thermodynamic computing and startup pressure of stopped flow injection analysis process with the calculating of starting time, there is not yet starting the correlative study achievement of technique with regard to hot waxy oil pipeline constant high-pressure with regard to the research that hot waxy oil pipeline constant high-pressure starts at present.
CN
102003623A discloses a kind of pipeline shutdown and restarts experimental provision, is provided with test line and auxiliary line and cooperates, and realizes the research of the stopped flow injection analysis rule to wax-containing oil pipe.The device only does in the lab the research of regularity, and can not be applied in actual production operation.
CN
103234119A discloses a kind of method that long-distance pipeline coal system band slurry starts, each segment pipe will be realized respectively from the process for opening into series connection closed conveying temporarily in the invention, final whole pipe-line system reaches normal feed flow, and the band slurry for realizing pipe-line system starts and system-wide series connection closed conveying.The invention is mainly used in the startup that the band containing solid particles such as cinders starches system.
CN
202707449U discloses a kind of pipeline constant pressure for liquid and conveys boot disk, the intelligent automatic energy saving control system of frequency conversion in use that the utility model is provided carries out energy-saving speed regulating to the refrigerating water pump of central air-conditioning, its discharge and water pressure is set to match with refrigeration, reach energy-conservation of consumption reduction, the purpose of improve product quality.The device is mainly used in supply channel, has basic different from wax-containing oil pipe.
The content of the invention
The technical problem to be solved is to provide a kind of hot waxy oil pipeline constant high-pressure to start method, realize that hot waxy oil pipeline technology quickly starts under constant high-pressure, and multi-purpose station pipeline pressure stability is maintained, while reducing the energy consumption of pump so as to even running.
To achieve these goals, the invention provides a kind of hot waxy oil pipe-line system constant high-pressure starts method, including herein below：
（1）Wax-containing oil pipe system of the present invention includes main pump（Group）, stand-by pump, oil pipeline, surge tank, flow process switching valve, relief valve, control pressurer system and internal recycle pipeline；
（2）When the pipe-line system of stopping transportation restarts, stand-by pump series connection is accessed in oil pipeline, be allowed to be located at the downstream of main pump；Oil pipeline is provided with surge tank in the upstream of main pump, and is that internal recycle pipeline is arranged between the entrance of the outlet of stand-by pump and the surge tank in afterbody oil transfer pump, and bypass flow regulating valve is arranged on internal recycle pipeline；According to the change of afterbody oil transportation pump discharge pressure, the aperture of bypass flow regulating valve is adjusted, to control the oil flow by internal recycle pipeline, so as to the constant high-pressure for realizing crude oil pipeline system starts.
In the method for the present invention, step can also be included（3）, when the pressure stability of waxy crude oil multi-purpose station pipeline, and output flow is reached after downstream requires, closing flow path switching valve and internal recycle pipeline, and stand-by pump is cut out from oil pipeline, is allowed in stand-by state, so as to the safety for realizing pipe-line system is restarted.
The method according to the invention, wherein, it is located on oil pipeline and main flow valve is set between main pump and surge tank, to control to enter the flow of main pump, and keep the inlet pressure of main pump to stablize, maintain main pump（Group）Normal operating conditions.
The method according to the invention, wherein, because the later output pressure of main pump and standby series connection of pumps and flow are significantly improved, therefore also it is provided with relief valve on stand-by pump outlet line, to prevent the excessive impact caused to pipeline of crude exports pressure, it is ensured that conduit running safety.
Simultaneously, the control pressurer system arranged on multi-purpose station pipeline includes pressure monitor and flow controller, to the pipeline pressure for monitoring multi-purpose station pipeline, and the aperture of the bypass flow regulating valve in the pipeline pressure control crude oil internal circulation system for monitoring, so as to adjust the flow and pressure of hot waxy oil in multi-purpose station pipeline, and part crude oil is recycled to into surge tank.Because hot waxy oil through pump group when pressurizeing, pump can do work to crude oil, the temperature for making crude oil in pipeline is significantly raised, and the crude oil in internal recycle pipeline returns to heat and oil pump is entered back into after surge tank is mixed with the hot waxy oil in main pipeline, heat can be made to accumulate in pump, so as to consume the service life of pump.Therefore, oil-to-water heat exchanger is further typically provided with interior circulation pipeline, for carrying out cooling process to the hot waxy oil for circulating.
In the method for the present invention, in pipe-line transportation system restarting procedure, multi-purpose station pipeline pressure remains constant high-pressure under the regulation of flow controller and bypass flow regulating valve.Hot waxy oil reaches in the duct yield limit so as to after mobile performance in the duct is stable, you can close bypass flow regulating valve, closes stand-by pump and it is cut out into pipeline, recovers by main pump（Group）The dynamical system state of maintenance, now multi-purpose station pipeline pressure can decline, but still in pressure constant state.
In the method for the present invention, wherein it is preferred that on oil pipeline, between the stand-by pump downstream of access conduit of especially connecting and relief valve pipeline auxiliary actuating apparatus are additionally provided with.Described pipeline auxiliary actuating apparatus include：Vehicle frame, liquid reserve tank, reaction chamber, control system and propulsion system, the propulsion system is arranged on the vehicle frame, for promoting the vehicle frame to move；The liquid reserve tank and reaction chamber are separately mounted on the vehicle frame, and the liquid reserve tank is higher than the reaction chamber, and the liquid reserve tank is connected with reaction chamber by conduit；The liquid reserve tank and reaction chamber are respectively provided with the reactant for generating gas for reaction；The conduit is provided with cut-out cock；The reaction chamber is provided with the venthole of supplied gas outflow；The control system is connected respectively with the propulsion system and cut-out cock.
In the method for the present invention, wherein being provided with relief valve on the venthole.
In the method for the present invention, wherein being provided with pressure-control valve in the liquid reserve tank, the pressure-control valve is connected with the control system.
In the method for the present invention, wherein the propulsion system includes battery, screw driver and wheel mechanism, the wheel mechanism is arranged on the vehicle frame；The screw driver is arranged on the rear end of the vehicle frame；The battery is connected with the screw driver, for providing power.
In the method for the present invention, wherein the screw driver includes two screws, two screws are symmetricly set on two side positions of the vehicle frame rear end, and the rotation direction of two screws is contrary.
Wherein, the wheel mechanism includes being separately mounted to two groups of screens pulleys of vehicle frame front and rear, and per group of screens pulley is 3, in 120 ° of angle arrangements between 3 screens pulleys.
Further, the screens pulley includes roller, wheel carrier and elastic shelf, and one end of the wheel carrier is fixed on the vehicle frame, and the other end installs the elastic shelf；The roller is arranged on the elastic shelf.The elastic shelf includes rectangular frame and spring, and the rectangular frame is hinged successively by 4 straight panels and is formed, and the spring is arranged on a pair of diagonal positions of rectangular frame；The rectangular frame it is another to being diagonally respectively mounted the roller and wheel carrier.
In the method for the present invention, described control system also includes locator, wireless signal transceiver and pressure sensor, and the wireless signal transceiver is connected respectively with the locator, pressure sensor.
Further, the front end of the vehicle frame is provided with radome fairing.
Compared with prior art, the beneficial effect of the inventive method is：
1st, using stand-by pump modified technique flow process, the constant high-pressure of multi-purpose station pipeline is kept in start-up course, so as to reduce the stopping transportation risk that hot waxy oil is caused to multi-purpose station pipeline in start-up course because thixotroping pressure is excessive.
2nd, the present invention is using surge tank and bypass flow regulating valve; pipeline pressure is disperseed in waxy crude oil start-up course; the accumulation of heat that pump is produced to waxy crude oil acting is solved the problems, such as, the startup pressure stability of whole pipeline is maintained and is served the effect of protective conduit safety.
3, in the inventive method, the hot waxy oil pipeline auxiliary actuating apparatus for wherein providing, the liquid reserve tank and reaction chamber of the reactant equipped with reaction generation gas are installed on vehicle frame, and separated using cut-out cock, when needing to start crude oil pipeline, when starting pump work, increase the pressure in pipeline, now, open the cut-out cock of auxiliary actuating apparatus, liquid reserve tank is set to connect with reaction chamber, reactant reaction generates gas, gas is discharged in pipeline, the rapid pressure for improving pipeline, coordinate the effect of main pump and stand-by pump, rupture the gelled crude in pipeline, pipeline is turned on again, further improve the success rate that pipeline is restarted.
Description of the drawings
Fig. 1 is that hot waxy oil pipeline constant high-pressure starts process chart.
Respectively mark in Fig. 1：1- surge tanks, 2- main pumps, 3- stand-by pumps, 4- flow process switching valves, 5- relief valves, 6- flow controllers, 7- bypass flow regulating valves, 8- oil-to-water heat exchangers, 9- main flow valves, 10- standby stream range of flow valves, 11- stop valves, 12- pressure monitors.
Fig. 2 is the left end view of pipeline auxiliary actuating apparatus in the present invention.
Fig. 3 is along the sectional view in A-A directions in Fig. 2.
Respectively mark in Fig. 2-3：1- pipelines；2- vehicle frames；3- liquid reserve tanks；4- reaction chambers；5- screens pulleys；6- conduits；7- cut-out cocks；8- control systems；9- central shafts；10- screw drivers；101- screws；11- batteries；12- radome fairings；31- pressure-control valves；41- relief valves；51- wheel carriers；52- elastic shelfs；53- rollers；521- springs.
Specific embodiment
Below in conjunction with the accompanying drawings, the specific embodiment of the present invention is described in further detail.Following instance is used to illustrate the present invention, but is not limited to the scope of the present invention.
Embodiment 1
As shown in figure 1, the wax-containing oil pipe system of the present invention includes main pump 2, stand-by pump 3, oil pipeline, surge tank 1, flow process switching valve 4, relief valve 5, control pressurer system and inner loop pipeline 13；
When the pipe-line system of stopping transportation restarts, stand-by pump 3 is connected in access oil pipeline, be allowed to be located at the downstream of main pump 2；Oil pipeline is provided with surge tank 1 in the upstream of main pump 2, and is that interior circulation pipeline 13 is arranged between the entrance of the outlet of stand-by pump 3 and the surge tank 1 in afterbody oil transfer pump, and bypass flow regulating valve 7 is arranged on interior circulation pipeline；According to the change of afterbody oil transportation pump discharge pressure, the aperture of bypass flow regulating valve is adjusted, to control the oil flow by internal recycle pipeline, so as to the constant high-pressure for realizing crude oil pipeline starts；After waxy crude oil reaches downstream and require in the pressure stability of multi-purpose station pipeline, output flow, circulating line is closed, and stand-by pump 3 is cut out from oil pipeline, be allowed in stand-by state, so as to the safety for realizing pipe-line system is restarted.
As shown in Figure 1, it is the constant high-pressure for ensureing multi-purpose station pipeline in start-up course when pipe-line system starts, by opening flow process switching valve 4 and closing the series connection that stop valve 11 realizes main pump 2 and stand-by pump 3, outer delivery outlet pressure and flow are improved, the high voltage demands of multi-purpose station pipeline are met.
After turn-on flow rate pump group, hot waxy oil enters surge tank 1 from main pipeline, by the control of main flow valve 9 into the flow of main pump 2, keeps the inlet pressure of main pump 2 stable, maintains the normal operating conditions of pump.
The output pressure and flow that main pump 2 and stand-by pump 3 are connected later is significantly improved, and the outlet line of stand-by pump 3 is provided with relief valve 5, to prevent the excessive impact caused to pipeline of crude exports pressure, it is ensured that pipe safety.Flow controller 6 and pressure monitor 12 are provided with multi-purpose station pipeline, to the pipeline pressure for monitoring multi-purpose station pipeline, and control the aperture of bypass flow regulating valve 7 in crude oil internal circulation system, the flow and pressure of hot waxy oil in control and regulation multi-purpose station pipeline are realized, and part crude oil is recycled to into surge tank 1.Hot waxy oil through pump group when pressurizeing, pump can do work to waxy crude oil, the temperature for making waxy crude oil is raised, and the crude oil in internal recycle pipeline returns to heat and oil pump is entered back into after surge tank is mixed with the hot waxy oil in main pipeline, heat can be made to accumulate in pump, consume the service life of pump.Therefore, oil-to-water heat exchanger 8 is equipped with interior circulation pipeline, for carrying out cooling process to hot waxy oil.
In start-up course, multi-purpose station pipeline pressure remains constant high pressure under the regulation of flow controller 6 and bypass flow regulating valve 7.Hot waxy oil reaches in the duct yield limit, after making its mobile performance in the duct stable, close bypass flow regulating valve 7, opening stop valve 11 simultaneously closes stand-by pump 3 and flow process switching valve 4, the dynamical system state that recovery is maintained by main pump 2, now multi-purpose station pipeline pressure can decline, but still in pressure constant state.
In whole start-up course, multi-purpose station pipeline pressure is not in fluctuation change, more will not cause stopping transportation accident because the short time thixotroping pressure produced in pipeline in start-up course is excessive.Technological process is entered after normal operating conditions, and stand-by pump 3 is closed and recovers normal process route, and facility is also provided on construction reformation.
Embodiment 2
As shown in Fig. 2 to 3, the wax-containing oil pipe auxiliary actuating apparatus used in the present invention, including：Vehicle frame 2, liquid reserve tank 3, reaction chamber 4, control system 8 and propulsion system, propulsion system is arranged on vehicle frame 2, for promoting vehicle frame 2 to move.Liquid reserve tank 3 and reaction chamber 4 are respectively provided with the reactant for generating gas for reaction, i.e. liquid reserve tank 3 is used for the first reactant equipped with liquid, and reaction chamber 4 is used to that the second reactant to be housed, and the first reactant and the second reactant can react generation gas.Liquid reserve tank 3 and reaction chamber 4 are separately mounted on vehicle frame 2, and liquid reserve tank 3 is higher than reaction chamber 4, liquid reserve tank 3 is connected with reaction chamber 4 by conduit 6, one end of conduit 6 is connected to the bottom of liquid reserve tank 3, the other end is connected on reaction chamber 4, the liquid stored in liquid reserve tank 3 is successfully flowed in reaction chamber 4.Reaction chamber 4 is provided with the venthole of supplied gas outflow；Venthole is provided with relief valve 41.The threshold values of relief valve 41 is set, and when the pressure in reaction chamber 4 reaches setting value, gas flows out from relief valve 41.Conduit 6 is provided with cut-out cock 7；Control system 8 is connected respectively with propulsion system and cut-out cock 7.
Further, propulsion system includes battery 11, screw driver 10 and wheel mechanism, and wheel mechanism is arranged on vehicle frame 2；Screw driver 10 is arranged on the rear end of vehicle frame 2；The front end of vehicle frame 2 is provided with radome fairing 12.Battery 11 is arranged on vehicle frame 2, and positioned at the lower section of liquid reserve tank 3, battery 11 is connected with screw driver 10, for providing power to screw driver 10.
Further, screw driver 10 includes two screws 101, and two screws 101 are symmetricly set on the side position of 2 rear end of vehicle frame two, and the rotation direction of two screws 101 is contrary.The model of two screws 101 is identical and is arranged symmetrically, and while advancing vehicle frame 2 to move, the respective turn-back moment loading for producing of cancelling out each other, in case auxiliary actuating apparatus upset or scraping inner-walls of duct, improves the stability in use of auxiliary actuating apparatus.
In the present embodiment, wheel mechanism includes being separately mounted to two groups of screens pulleys 5 of the front and rear of vehicle frame 2, and every group of screens pulley 5 is 3, and 3 screens pulleys 5 are circumferentially arranged, are engaged with pipeline 1, and is in 120 ° of angles between 3 screens pulleys 5.Screens pulley 5 includes roller 53, wheel carrier 51 and elastic shelf 52, and one end of wheel carrier 51 is fixed on vehicle frame 2, and the other end installs elastic shelf 52；Roller 53 is arranged on elastic shelf 52.Elastic shelf 52 includes rectangular frame and spring 521, and rectangular frame is hinged successively by 4 straight panels and is formed, and a pair of rectangular frame are diagonally respectively mounted roller 53 and wheel carrier 51, and spring 521 is arranged on the another to diagonal position of rectangular frame.The tensile force that the rectangular frame being hinged passes through spring 521, make rectangular frame that there is elastic force, therefore, roller 53 has automatic telescopic function, guarantee that auxiliary actuating apparatus can all the time tight against inner-walls of duct, prevent auxiliary actuating apparatus from colliding with pipeline, while the frictional resistance in auxiliary actuating apparatus traveling process can be reduced.
A central shaft 9 is provided with vehicle frame 2, central shaft 9 is located at the center that the home position of whole auxiliary actuating apparatus, i.e. central shaft 9 are located at every group of screens pulley 5.When in auxiliary actuating apparatus propulsion branch pipe(tube) 1, the position of central shaft 9 is just identical with the axle center of pipeline 1.By central shaft 9, make auxiliary actuating apparatus that there is preferable stability when advancing in pipeline 1.
Further, the top of liquid reserve tank 3 is provided with pressure-control valve 31, and pressure-control valve 31 is connected with control system 8, control system 8 sends control instruction to pressure-control valve 31, be opened and closed pressure-control valve 31, so as to control liquid reserve tank 3 in pressure, control the first reactant whether flow out from conduit 6.When overpressure exceeds limit value, then external control sends control instruction centrally through control system 8 to cut-out cock 7, and cut-out cock 7 isolates two kinds of solution, and chemical reaction stops.When 7 failure of cut-out cock, the high pressure in pipeline 1 closes can pressure-control valve 31, and the first reactant in liquid reserve tank 3 cannot be flowed in reaction chamber 4, stop reaction.Can be with the pressure in dual guarantee pipeline in control range by pressure-control valve.
Further, control system 8 includes locator, wireless signal transceiver and pressure sensor, and wireless signal transceiver is connected respectively with locator, pressure sensor, propulsion system, pressure-control valve 31 and cut-out cock 7.Specifically, wireless signal transceiver is connected with screw driver, controls the work of screw driver.Pressure in pressure sensor detection pipeline 1, and external control center is sent to by wireless signal transceiver, external control is centrally through calculating signal, wireless signal transceiver is sent instructions to, wireless signal transceiver sends a signal to propulsion plant, pressure-control valve 31 and cut-out cock 7.Locator detects the position signalling of auxiliary actuating apparatus, and position signalling is sent to into external control center by wireless signal transceiver, so that it is determined that the position of auxiliary actuating apparatus, and control propulsion system work or stop.
Load the first reactant in liquid reserve tank 3, the second reactant is loaded in reaction chamber 4.In the present embodiment, the first reactant is aluminum sulfate, and the second reactant is sodium acid carbonate；Or first reactant be sodium acid carbonate, the second reactant be aluminum sulfate.After 1 stopping transportation of pipeline, auxiliary actuating apparatus are placed in into pipe end, external control center sends enabled instruction to control system.Control system 8 is connected to after the enabled instruction, connects battery circuit, starts screw driver, and auxiliary actuating apparatus to ducts upstream is advanced.In auxiliary actuating apparatus progradation, the continuous test position of locator of control system 8, and launch framing signal and give external control center, received by external control center and analyzed.After device arrives at specified location, external control center sends cutoff command, and auxiliary actuating apparatus stop in precalculated position.
When pipeline is restarted, the pressure sensor in control system to outside control centre sends " locality " pressure signal, and the explanation when increasing occurs in pressure starts pressure forward and has advanced into the position.Now, external control center sends " detonation " instruction.The control system of auxiliary actuating apparatus is connected to after " detonation " instruction, opens standby pressure-control valve and cut-out cock, and the first reactant Jing conduits in liquid reserve tank are flowed in reaction chamber.There is chemical reaction in two kinds of material contacts, produce a large amount of gases.Chemical equation is：
Al2(SO4)3+6NaHCO3=3Na2SO4+2Al(OH)3↓+6CO2↑。
Reacting gas Jing relief valves enter pipeline 1, so that pipeline produces high pressure, aid in the startup pump of series connection（Main pump and stand-by pump）The jelling structure of oil product in destruction pipe, makes pipeline recover flowing.
It should be noted that the first reactant and the second reactant are not limited to two kinds of chemical reactants of the present embodiment, any two can produce the chemical reactant that the gas insoluble in crude oil can be used as auxiliary actuating apparatus of the present invention.Second reactant need not be liquid substance, can be solid matter.Specific requirement is：（1）Course of reaction does not absorb heat, namely will not increase oil product structural strength；（2）Reaction product matter is not acid strong, namely will not corrosion pipeline；（3）The solid of formation is not into bulk, namely will not block pipeline；（4）Generate gas flow more and be not readily dissolved in crude oil, namely do not result in the excessive pressure loss.
Preferably, control system 8 can also include CPU（Central processing unit）, CPU is connected respectively with wireless signal transceiver, locator, pressure sensor, propulsion system, pressure-control valve 31 and cut-out cock 7.When pressure sensor detects pressure buildup, CPU is sent a signal to, CPU is processed signal, send control instruction control cut-out cock 7, pressure-control valve 31 and propulsion system work.
Embodiment 3
The present embodiment is substantially the same manner as Example 1, and institute's difference is：The wheel mechanism of the present embodiment adopts 4 wheels, 4 wheels lower position in vehicle frame in rectangular layout.
Presently preferred embodiments of the present invention is the foregoing is only, not to limit the present invention, all any modification, equivalent substitution and improvements within the spirit and principles in the present invention, made etc., be should be included within the scope of the present invention.
Claims (16)
1. a kind of hot waxy oil pipe-line system constant high-pressure starts method, including herein below：
（1）Wax-containing oil pipe system of the present invention includes main pump, stand-by pump, oil pipeline, surge tank, flow process switching valve, relief valve, control pressurer system and crude oil inner loop pipeline；
（2）When the pipe-line system of stopping transportation restarts, stand-by pump series connection is accessed in oil pipeline, be allowed to be located at the downstream of main pump；Oil pipeline is provided with surge tank in the upstream of main pump, and is that pipeloop is arranged between the entrance of the outlet of stand-by pump and the surge tank in afterbody oil transfer pump, and bypass flow regulating valve is arranged on pipeloop；According to the change of afterbody oil transportation pump discharge pressure, the aperture of bypass flow regulating valve is adjusted, to control the oil flow by circulating line, the constant high-pressure for realizing crude oil pipeline starts；After pressure stability, output flow when waxy crude oil multi-purpose station pipeline reaches downstream requirement, circulating line is closed, and stand-by pump is cut out from oil pipeline, be allowed in stand-by state, so as to the safety for realizing pipe-line system is restarted.
2. in accordance with the method for claim 1, it is characterised in that main flow valve is arranged on oil pipeline, to control to enter the flow of main pump, and keep the inlet pressure of main pump to stablize.
3. in accordance with the method for claim 1, it is characterised in that be provided with relief valve on stand-by pump outlet line, preventing the excessive impact caused to pipeline of crude exports pressure, it is ensured that conduit running safety.
4. in accordance with the method for claim 1, it is characterised in that meanwhile, the control pressurer system arranged on multi-purpose station pipeline includes pressure monitor and flow controller.
5. in accordance with the method for claim 1, it is characterised in that be additionally provided with oil-to-water heat exchanger on interior circulation pipeline, for circulate hot waxy oil carry out cooling process.
6. pipeline auxiliary actuating apparatus are additionally provided between the stand-by pump downstream of access conduit of in accordance with the method for claim 3, it is characterised in that on oil pipeline, connecting and relief valve.
7. in accordance with the method for claim 6, it is characterised in that described pipeline auxiliary actuating apparatus include：Vehicle frame, liquid reserve tank, reaction chamber, control system and propulsion system, the propulsion system is arranged on the vehicle frame, for promoting the vehicle frame to move；The liquid reserve tank and reaction chamber are separately mounted on the vehicle frame, and the liquid reserve tank is higher than the reaction chamber, and the liquid reserve tank is connected with reaction chamber by conduit；The liquid reserve tank and reaction chamber are respectively provided with the reactant for generating gas for reaction；The conduit is provided with cut-out cock；The reaction chamber is provided with the venthole of supplied gas outflow；The control system is connected respectively with the propulsion system and cut-out cock.
8. in accordance with the method for claim 7, it is characterised in that the venthole is provided with relief valve.
9. in accordance with the method for claim 7, it is characterised in that the liquid reserve tank is provided with pressure-control valve, the pressure-control valve is connected with the control system.
10. in accordance with the method for claim 7, it is characterised in that the propulsion system includes battery, screw driver and wheel mechanism, the wheel mechanism is arranged on the vehicle frame；The screw driver is arranged on the rear end of the vehicle frame；The battery is connected with the screw driver, for providing power.
11. in accordance with the method for claim 10, it is characterised in that the screw driver includes two screws, and two screws are symmetricly set on two side positions of the vehicle frame rear end, and the rotation direction of two screws is contrary.
12. in accordance with the method for claim 10, it is characterised in that the wheel mechanism includes being separately mounted to two groups of screens pulleys of vehicle frame front and rear, and per group of screens pulley is 3, in 120 ° of angle arrangements between 3 screens pulleys.
13. in accordance with the method for claim 12, it is characterised in that the screens pulley includes roller, wheel carrier and elastic shelf, and one end of the wheel carrier is fixed on the vehicle frame, and the other end installs the elastic shelf；The roller is arranged on the elastic shelf.
14. in accordance with the method for claim 13, it is characterised in that the elastic shelf includes rectangular frame and spring, and the rectangular frame is hinged successively by 4 straight panels and is formed, and the spring is arranged on a pair of diagonal positions of rectangular frame；The rectangular frame it is another to being diagonally respectively mounted the roller and wheel carrier.
15. in accordance with the method for claim 7, it is characterised in that the control system includes locator, wireless signal transceiver and pressure sensor, and the wireless signal transceiver is connected respectively with the locator, pressure sensor.
16. in accordance with the method for claim 7, it is characterised in that the front end of the vehicle frame is provided with radome fairing.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108758349A (en) * | 2018-07-30 | 2018-11-06 | 中国石油工程建设有限公司 | Middle and long distance Molten sulphur pipeline shutdown and restart safety relief system and method |
| CN109357163A (en) * | 2018-11-23 | 2019-02-19 | 中国石油工程建设有限公司 | A kind of gaseous ethane pipeline shutdown restarts system and method |
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| CN108758349A (en) * | 2018-07-30 | 2018-11-06 | 中国石油工程建设有限公司 | Middle and long distance Molten sulphur pipeline shutdown and restart safety relief system and method |
| CN108758349B (en) * | 2018-07-30 | 2023-09-29 | 中国石油工程建设有限公司 | System and method for stopping and restarting safety release of medium-long distance liquid sulfur pipeline |
| CN109357163A (en) * | 2018-11-23 | 2019-02-19 | 中国石油工程建设有限公司 | A kind of gaseous ethane pipeline shutdown restarts system and method |
| CN109357163B (en) * | 2018-11-23 | 2023-10-03 | 中国石油工程建设有限公司 | System and method for stopping and restarting gaseous ethane pipeline |
| CN110657350A (en) * | 2019-08-21 | 2020-01-07 | 云南大红山管道有限公司 | Protection device and method for low-pressure system equipment for ore pulp pipeline transportation |
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