CN109310002B - Oil static eliminator combining active and passive - Google Patents
Oil static eliminator combining active and passive Download PDFInfo
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- CN109310002B CN109310002B CN201711133449.5A CN201711133449A CN109310002B CN 109310002 B CN109310002 B CN 109310002B CN 201711133449 A CN201711133449 A CN 201711133449A CN 109310002 B CN109310002 B CN 109310002B
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- pipeline
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- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05F—STATIC ELECTRICITY; NATURALLY-OCCURRING ELECTRICITY
- H05F3/00—Carrying-off electrostatic charges
- H05F3/04—Carrying-off electrostatic charges by means of spark gaps or other discharge devices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R29/00—Arrangements for measuring or indicating electric quantities not covered by groups G01R19/00 - G01R27/00
- G01R29/24—Arrangements for measuring quantities of charge
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- General Physics & Mathematics (AREA)
- Pipeline Systems (AREA)
- Elimination Of Static Electricity (AREA)
Abstract
The invention provides an oil product static eliminator combining active and passive, which mainly solves the problem that oil product static in a fine oil pipeline cannot be eliminated. Connecting the oil product static eliminator on the pipeline in series through a connecting flange; the insulation module ensures that the discharge needle and the pipeline cannot be punctured by high voltage; the oil charge density monitor is used for monitoring the electrostatic charge condition of oil in the pipeline and uploading monitoring data to the control module; the control device controls the output voltage of the positive voltage generating device and the output voltage of the negative voltage generating device; the switch controls the connection of the positive voltage generating device, the negative voltage generating device and the grounding device with the discharge needle; the discharge needle is connected with the grounding module for a long time, and when the data detected by the oil charge density monitor exceeds a threshold value, the discharge needle discharges to eliminate charges.
Description
Technical Field
The invention relates to oil delivery pipe static elimination equipment in flammable and explosive places such as petrochemical oil and gas storage and transportation, in particular to an active and passive oil static eliminator.
Background
In the oil conveying process, a large amount of static electricity is generated in the oil conveying process due to the reasons that the conductivity of the oil is low, the oil conveying speed is too high, the oil contains impurities and the like. GB 12158 and 2006 general guidelines for preventing electrostatic accidents and GB 13348 and 2009 Electrostatic safety regulations for liquid Petroleum products specify that a liquid electrostatic eliminator can be installed at the end of a pipe to reduce electrostatic accumulation. However, at present, the oil pipeline static eliminator is mainly a passive static eliminator, which eliminates oil static by discharging static electricity of discharge needles in an induction mode and is installed on a pipeline with a larger diameter.
At present, the method for eliminating static in pipeline oil products mainly comprises the following steps: (1) static electricity is leaked in the grounding of the metal shell, the static electricity on the metal shell can only be conducted away in the mode, the static electricity in the oil product cannot be conducted away, and the static electricity elimination needs a certain time and cannot meet the requirement of the flow velocity of the oil product, so that the instant discharge accident is still difficult to avoid. (2) And (4) additionally installing a pipeline static eliminator. At present, an active oil product static eliminator is not applied to a small-diameter thin pipe of an oil pipeline. The method of installing the pipeline static eliminator is commonly used in large-scale oil pipelines, static electricity is more easily generated in the thin oil pipelines due to the slender pipelines, the flow rate of oil products in the pipelines is high, and the method of leaking the static electricity by grounding of a metal shell is not suitable; when no oil exists in the pipeline or the cross section of the fluid in the pipeline is smaller than the diameter of the pipeline, a large amount of oil gas is remained in the pipeline under the two conditions, and the discharge needle discharges to easily cause danger. The device can not adapt to the condition of large change of the charge quantity in the pipeline, and can ensure the safety when the charge quantity is small and timely leak static electricity. In addition, the explosion danger is easily caused in the process of high-voltage discharge by the discharge needle, so that an oil product static eliminator combining an active mode and a passive mode needs to be designed.
Disclosure of Invention
The technical problem to be solved by the invention is that an oil product static eliminator combining active and passive is applied to a fine oil pipeline, which eliminates static in the pipeline and avoids explosion danger caused by high-voltage discharge, and the technical scheme is as follows:
an oil product static eliminator combining active and passive modes comprises a pipeline, a connecting flange, a discharge needle, an insulating block, an oil product charge density monitor, a switch, a grounding device, a positive voltage generating device, a negative voltage generating device and a control device; the oil charge density monitor is arranged on the pipeline and is connected with the control device through a data line; the control device controls the output voltage of the positive voltage generating device and the output voltage of the negative voltage generating device; the switch controls the connection of the positive voltage generating device, the negative voltage generating device and the grounding device with the discharge needle; the plurality of discharge needles are arranged on the inner wall of the pipeline and are uniformly and symmetrically distributed, the discharge ends of the discharge needles are wrapped in the insulating block, the insulating block is exposed out of the discharge ends, and a gap is reserved between the discharge ends of the discharge needles and the inner wall of the pipeline; the discharge needle is connected with the switch device through a lead.
Preferably, the discharge needles are uniformly distributed in 4 rows by taking the pipeline axis as a symmetry axis, the distances among the discharge needles in the pipeline direction are equal, and 4 discharge needles are arranged in each row.
It is also preferable that the pipe is used as a main body of the static eliminator, has a diameter equal to that of the oil pipeline, and is connected in series to the oil pipeline through a connecting flange.
It is also preferred that the length of the pipe is 3 to 7 times the diameter of the pipe.
It is also preferred that the insulating block is made of polytetrafluoroethylene.
It is also preferable that the radius of curvature of the end of the discharge needle is 1000 μm.
Preferably, the switch is a three-phase switch, one side of the switch is connected to a lead wire connected to the discharge needle, and the other side of the switch is provided with a switch circuit among the positive voltage generating device, the negative voltage generating device and the grounding device.
It is further preferred that the control device controls the switch to be closed, and when the oil charge density monitor monitors that the oil charge density is less than +/-5 μ C/m3When the grounding device is used, the circuit switch of the grounding device is closed, and the electrostatic charge is led out through grounding; when the charge density of the oil product is monitored by the charge density monitor to be more than +5 mu C/m3When the negative voltage generator is used, a line switch of the grounding device is opened, and a line switch connected with the negative voltage generator is closed; when the oil charge density monitor monitors that the oil charge density is more than-5 mu C/m3When the positive voltage is generated, the grounding device is connected with the positive voltage generating device.
More preferably, the output voltage of the positive voltage generator and the output voltage of the negative voltage generator are between 0 and 1500V.
The invention has the beneficial effects that: the tip of the used discharge needle has smaller curvature radius, is easy to carry out ionization discharge and is more beneficial to eliminating the static electricity of oil products; the insulating block is used for ensuring that the discharge needle and the pipeline are not punctured due to discharge, and ensuring that the discharge needle plays a role; the discharge needle is arranged at the bottom of the pipeline, and a gap is reserved between the discharge end of the discharge needle and the inner wall of the pipeline, so that the discharge needle is easily immersed by oil, and the explosion danger caused by the direct discharge of the discharge needle of the active oil eliminator in the pipeline where oil gas exists is avoided;
drawings
FIG. 1 is a schematic view of an active oil electrostatic eliminator;
FIG. 2 is a schematic view of a structure of a discharge needle;
FIG. 3 is a schematic view of an improved electrostatic eliminator for oil products;
FIG. 4 is a schematic view of a modified discharge needle;
in the figure: 1-a pipeline; 2-a connecting flange; 3-a discharge needle; 4-an insulating block; 5-oil charge density monitor; 6-a switch; 7-a grounding device; 8-positive voltage generating means; 9-negative voltage generating means; 10-control means.
Detailed Description
An active and passive oil product static eliminator comprises a pipeline 1, a connecting flange 2, a discharge needle 3, an insulating block 4, an oil product charge density monitor 5, a switch 6, a grounding device 7, a positive voltage generating device 8, a negative voltage generating device 9 and a control device 10. The pipeline 1 is used as the main body of the oil product static eliminator, the diameter of the pipeline is equal to the diameter of an oil pipeline, and the pipeline is connected in series with the oil pipeline through a connecting flange 2. Insulating block 4 parcel discharge needle 3, discharge needle 3 sets up on pipeline 1 body, and oil charge density monitor 5 stretches into and measures the electrified charge density of oil in the pipeline oil. The discharge needle 3 is connected with a switch 6 through a lead, the switch is respectively connected with a grounding device 7, a positive voltage generating device 8 and a negative voltage generating device 9, and a control device 10 controls the switch 6, the grounding device 7, the positive voltage generating device 8 and the negative voltage generating device 9 to work.
The oil charge density monitor 5 is arranged on the pipeline, the oil charge density monitor 5 is connected with the control device 10 through a data line, and the oil charge density monitor 5 is connected with the control device 10 through a data line; the control device 10 controls the output voltage of the positive voltage generating device 8 and the output voltage of the negative voltage generating device 9; the switch 6 controls the connection of the positive voltage generating device 8, the negative voltage generating device 9 and the grounding device 7 with the discharge needle 3; the plurality of discharge needles 3 are arranged on the inner wall of the pipeline and are uniformly and symmetrically arranged, the discharge ends of the discharge needles 3 are wrapped in the insulating block 4, the insulating block 4 is exposed out of the discharge ends, and gaps are reserved between the discharge ends of the discharge needles 3 and the inner wall of the pipeline; the discharge needle 3 is connected with the switch 6 device through a lead.
Referring to fig. 1 and 2, the discharge needle is further specifically described, the discharge needle 3 is wrapped in the insulating block, the discharge end of the discharge needle exposes out of the insulating block 4, and the insulating block 4 is made of polytetrafluoroethylene. A gap is left between the discharge end of the discharge needle 3 and the inner wall of the pipeline, and the curvature radius of the end part of the discharge needle 3 is 1000 mu m. The spray point 3 evenly arranges along 1 circumference of pipeline, all outcrop in 1 inner wall formation recess of pipeline with the spray point, guaranteed that 3 tip of spray point are in all the time under the liquid level of oil, still can residual part oil in the recess that the pipeline inner wall spray point exists when even there is not the oil in the pipeline, thereby cover 3 tip of spray point, not only avoided the burning and exploding danger that the direct pipeline 1 internal discharge that persists of active oil annihilator spray point 3 leads to of active oil annihilator spray point, still protected the spray point 3 not damaged by the corrosive action.
One of the preferred arrangement schemes of the discharge needles is specifically described with reference to fig. 1 and 2, the discharge needles 3 are wrapped by an insulating material, an insulating block 4 is arranged between the body of the pipeline 1 and the discharge needles 3, the insulating block 4 is made of polytetrafluoroethylene, and the polytetrafluoroethylene is used for ensuring that the discharge needles 3 and the pipeline 1 cannot be broken down by 20000V high voltage. The discharge needles 3 are uniformly distributed in 4 rows by taking the axis of the pipeline 1 as a symmetry axis, the distances among the discharge needles in the direction along the pipeline 1 are equal, and 4 discharge needles are arranged in each row. The discharge needles can also be uniformly and symmetrically arranged around the pipeline according to the length of the pipeline. The discharge needles are symmetrically arranged around the pipeline 1, so that voltage can be conveniently released, and the discharge needles are symmetrically arranged at the top end and the bottom end of the pipeline 1. The distances between the electric needles in the direction along the pipeline are equal, and the distances between the electric needles in the direction along the tangent plane of the pipeline are equal. Experiments confirm that the size of the discharge needle 3 is specifically designed to be 2mm in diameter and 10mm in length, and the discharge effect of the discharge needle is the best under the size condition.
To further specify the power supply condition of the voltage generating device, the output voltage of the positive voltage generating device 8 and the output voltage of the negative voltage generating device 9 are less than 1500V. The positive voltage generating device 8 can output positive voltage of 0-1500V, and the magnitude can be adjusted. The negative voltage generating device 9 can output negative 0-1500V voltage, and the magnitude can be adjusted. The control device 10 receives the measurement data of the oil charge density monitor 5, and when the detection value is more than 5 mu C/m3At this time, the controller 10 controls the positive voltage generator 8 or the negative voltage generator 9 to discharge.
Further specifically describing the control situation of the control device, the working process of the control device specifically comprises the following steps: when the oil charge density monitor 5 monitors that the charge density in the pipeline is + 5-20 mu C/m3In between, the output voltage of the negative voltage generating device 9 is adjusted between-1V and-1500V,in particular + 5. mu.C/m3Corresponding to-10 v, the voltage correspondingly rises along with the rise of the charge density, the control device 10 controls the negative voltage generating device 9 to be closed, and the output voltage of the power supply is adjusted along with the equal gradient of the charge density. When the oil charge density monitor monitors that the charge density in the pipeline 1 is between 5 and 20 mu C/m3In the meantime, the control device 10 controls the positive voltage generating device 8 to be started, and the output voltage of the positive voltage generating device 8 is regulated between +1 and +1500V, specifically-5 μ C/m3Correspondingly to +10v, the voltage correspondingly rises along with the rise of the charge density, the voltage and the voltage are in a linear increasing relationship, the control device 10 controls the positive voltage generating device 8 to be closed, and the output voltage of the power supply is adjusted along with the charge density and other gradients.
It is to be understood that the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and those skilled in the art may make modifications, alterations, additions or substitutions within the spirit and scope of the present invention.
Claims (4)
1. An active and passive combined oil product static eliminator is characterized by comprising a pipeline, a connecting flange, a discharge needle, an insulating block, an oil product charge density monitor, a switch, a grounding device, a positive voltage generating device, a negative voltage generating device and a control device;
the oil charge density monitor is arranged on the pipeline and is connected with the control device through a data line;
the control device controls the output voltage of the positive voltage generating device and the output voltage of the negative voltage generating device; the switch controls the connection of the positive voltage generating device, the negative voltage generating device and the grounding device with the discharge needle;
the plurality of discharge needles are arranged on the inner wall of the pipeline and are uniformly and symmetrically distributed, the discharge ends of the discharge needles are wrapped in the insulating block, the insulating block is exposed out of the discharge ends, and a gap is reserved between the discharge ends of the discharge needles and the inner wall of the pipeline; the discharge needle is connected with the switch device through a lead;
the pipeline is used as the main body of the static eliminator, the diameter of the pipeline is equal to the diameter of the oil pipeline, and the pipeline is connected in series with the oil pipeline through a connecting flange; the length of the pipeline is 3-7 times of the diameter of the pipeline; the switch is a three-phase switch, one side of the switch is connected with a lead connected with the discharge needle, and the other side of the switch is respectively provided with a switch circuit among the positive voltage generating device, the negative voltage generating device and the grounding device; the output voltage of the positive voltage generating device and the output voltage of the negative voltage generating device are between 0 and 1500V;
the control device controls the switch to be closed, and when the oil charge density monitor monitors that the oil charge density is less than +/-5 mu C/m3When the grounding device is used, the circuit switch of the grounding device is closed, and the electrostatic charge is led out through grounding; when the charge density of the oil product is monitored by the charge density monitor to be more than +5 mu C/m3When the negative voltage generator is used, a line switch of the grounding device is opened, and a line switch connected with the negative voltage generator is closed; when the oil charge density monitor monitors that the oil charge density is more than-5 mu C/m3When the positive voltage generator is connected with the ground device, the line switch of the ground device is opened, and the line switch connected with the positive voltage generator is closed;
when the oil charge density monitor monitors that the charge density in the pipeline is + 5-20 mu C/m3In the middle, the output voltage of the negative voltage generator is adjusted between-1 to-1500V, specifically +5 μ C/m3Corresponding to-10 v, the voltage correspondingly rises and linearly increases along with the rise of the charge density, the control device controls the negative voltage generating device to be closed, and the output voltage of the power supply is adjusted along with the equal gradient of the charge density; when the charge density monitor of the oil product monitors that the charge density in the pipeline is within-5 to-20 mu C/m3In the middle, the control device controls the positive voltage generating device to be started, and the output voltage of the positive voltage generating device is adjusted between +1 to +1500V, specifically-5 μ C/m3Correspondingly to +10v, the voltage correspondingly rises and linearly increases along with the rise of the charge density, the control device controls the positive voltage generating device to be switched off, and the output voltage of the power supply is adjusted along with the equal gradient of the charge density.
2. The oil product static eliminator combining the active and the passive as claimed in claim 1, characterized in that the discharge needles are evenly distributed in 4 rows with the pipeline axis as the symmetry axis, the distance between the discharge needles along the pipeline direction is equal, 4 discharge needles are arranged in each row.
3. The combined active and passive oil static eliminator of claim 1, wherein said insulating block is made of teflon.
4. A combined active and passive oil electrostatic eliminator as claimed in claim 1 or 2, wherein the radius of curvature of said discharge pin end is 1000 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711133449.5A CN109310002B (en) | 2017-11-16 | 2017-11-16 | Oil static eliminator combining active and passive |
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| CN201711133449.5A CN109310002B (en) | 2017-11-16 | 2017-11-16 | Oil static eliminator combining active and passive |
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| CN109310002A CN109310002A (en) | 2019-02-05 |
| CN109310002B true CN109310002B (en) | 2021-02-09 |
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