CN112814882B - Electric chemical agent injection system capable of automatically adjusting flow - Google Patents
Electric chemical agent injection system capable of automatically adjusting flow Download PDFInfo
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- CN112814882B CN112814882B CN202011629704.7A CN202011629704A CN112814882B CN 112814882 B CN112814882 B CN 112814882B CN 202011629704 A CN202011629704 A CN 202011629704A CN 112814882 B CN112814882 B CN 112814882B
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- pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B37/00—Methods or apparatus for cleaning boreholes or wells
- E21B37/06—Methods or apparatus for cleaning boreholes or wells using chemical means for preventing, limiting or eliminating the deposition of paraffins or like substances
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B41/00—Equipment or details not covered by groups E21B15/00 - E21B40/00
- E21B41/02—Equipment or details not covered by groups E21B15/00 - E21B40/00 in situ inhibition of corrosion in boreholes or wells
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21B—EARTH DRILLING, e.g. DEEP DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B43/00—Methods or apparatus for obtaining oil, gas, water, soluble or meltable materials or a slurry of minerals from wells
- E21B43/16—Enhanced recovery methods for obtaining hydrocarbons
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
Abstract
The application relates to an electric chemical injection system capable of automatically adjusting flow, which comprises a liquid storage assembly, a chemical filling assembly and a stroke adjusting assembly, wherein the liquid storage assembly is used for acquiring and storing chemical liquid medicine from a raw material unit and conveying the chemical liquid medicine to a specified well body. A user can manually input given parameters by operating keys and a display screen on a panel of the intelligent electric stroke controller on site, and change the rotating angle of an output shaft of the electric angular stroke actuating mechanism, thereby adjusting the output flow of the metering pump; the electric chemical agent injection system receives the automatic adjustment control signals of 4-20mA sent remotely from the station control DCS, and changes the rotation angle of the output shaft of the electric angular stroke execution mechanism, so that the stroke length of the metering pump is changed, and the output flow of the metering pump is remotely and automatically adjusted. An operator can remotely adjust the flow of the metering pump by operating a terminal of the station control DCS through the control room in the station. This application has the effect that improves work efficiency.
Description
Technical Field
The application relates to the field of electric dosing devices, in particular to an electric chemical agent injection system capable of automatically adjusting flow.
Background
At present, in the engineering of exploring or developing liquid and gaseous mineral products such as petroleum, natural gas and the like, well drilling and completion are very important links. The chemical injection system is used for accurately and quantitatively filling chemical liquid medicines such as corrosion inhibitor, scale inhibitor, demulsifier, flocculant, acid, alkali and the like into a well body such as a crude oil well or a natural gas well according to the requirements of the process flows such as well drilling, well completion and the like. The chemical injection system can achieve the effects of different processes such as corrosion relieving, descaling, paraffin removing, rust removing, asphalt removing or blockage removing by acquiring or storing the chemical liquid medicine from the raw material unit and outputting the chemical liquid medicine to the specified well body, and the chemical injection system not only can be adapted to the physical or chemical characteristics of various chemical agents, but also needs to meet the conditions of the field environmental working conditions so as to meet the normal production requirements of the well body such as a raw oil well or a natural gas well.
In view of the related art in the above, the inventors consider that a plunger type metering pump is often used for the metering pump; this kind of measuring pump belongs to the reciprocal positive displacement pump of mechanical type, and the measuring pump needs artifical manual regulation measuring pump's stroke length regulating part usually when adjusting the flow, and then changes the effective length of plunger or diaphragm in the measuring pump, and then changes the stroke length of measuring pump, realizes adjusting the flow size of measuring pump, but this kind of mode that needs artifical closely manual regulation is comparatively wasted time and energy, influences work efficiency.
Disclosure of Invention
In order to improve the work efficiency, the application provides an electrodynamic chemical agent injection system capable of automatically adjusting the flow.
The application provides a but electronic chemical agent injection system of automatically regulated flow adopts following technical scheme:
an electric chemical agent injection system capable of automatically adjusting flow is used for obtaining chemical liquid medicine from a raw material unit and delivering the chemical liquid medicine to a specified well body and comprises a liquid storage assembly, a medicament filling assembly and a stroke adjusting assembly,
the medicament filling assembly comprises a low-pressure pipeline, a metering pump and a high-pressure pipeline, wherein the low-pressure pipeline, the metering pump and the high-pressure pipeline are sequentially arranged and communicated according to the transmission direction of liquid medicament;
the liquid storage assembly comprises a liquid storage tank, and the liquid storage tank is provided with a liquid inlet interface communicated with the raw material unit and a liquid outlet interface communicated with the low-pressure pipeline;
the stroke adjusting assembly comprises an electric angle stroke executing mechanism for driving the stroke length adjusting part of the metering pump to rotate and a stroke adjusting control device for performing information interaction with a remote terminal, and the stroke adjusting control device is electrically connected with the electric angle stroke executing mechanism;
the stroke adjusting control device outputs a stroke length adjusting signal for driving the electric angle stroke executing mechanism to work to the electric angle stroke executing mechanism based on a remote flow adjusting signal sent by a remote terminal.
By adopting the technical scheme, the electric chemical agent injection system can enable chemical liquid medicine to sequentially pass through the liquid storage assembly, the low-pressure pipeline, the agent injection assembly and the high-pressure pipeline to be injected into an externally preset injection pipeline, and then the chemical liquid medicine can be injected into a designated well body through the injection pipeline. The user can send a remote flow adjusting signal through the remote terminal to drive the electric angular stroke actuating mechanism to complete the operation of rotating the stroke length adjusting piece of the metering pump, and further realize the flow adjustment of the metering pump. The automatic remote control of the metering pump is realized, and an operator can remotely adjust the flow of the metering pump through a remote terminal.
Optionally, the stroke adjustment control device includes a control module, a display module for displaying the stroke data of the metering pump, an operation key panel for sending an execution instruction to the control module, a signal transceiver module for implementing signal transmission with a remote terminal, and a power supply module for supplying power to the control module, wherein the display module, the operation key panel, the signal transceiver module and the power supply module are all electrically connected to the control module.
By adopting the technical scheme, the power supply module can supply power to the control module; a user can send an adjusting instruction to the control module by touching and pressing keys of the operation key panel, and the control module outputs a flow adjusting signal based on the adjusting pointing electric angular travel executing mechanism so as to enable the angular travel executing mechanism to adjust the flow. The remote terminal can send an adjusting instruction to the control module through the signal receiving and sending module, and the control module outputs a flow adjusting signal based on the adjusting pointing electric angle stroke executing mechanism so as to enable the angle stroke executing mechanism to adjust the flow. Therefore, the flow regulation mode of the metering pump comprises remote manual regulation realized by a user through remote terminal control and close-distance manual regulation realized by the user through direct control of the operation key panel.
Optionally, the stroke adjusting and controlling device is an explosion-proof electric stroke controller.
Through adopting above-mentioned technical scheme, select for use explosion-proof electronic stroke controller, improve stroke regulation controlling means's security to improve stroke regulation controlling means's job stabilization nature.
Optionally, the medicament filling assembly further comprises a filling motor for providing power for the metering pump, and the filling motor is a low-pressure explosion-proof motor.
By adopting the technical scheme, the output shaft of the filling motor is connected with the driving shaft of the metering pump, so that the filling motor can provide power for the metering pump, and the safety and the working stability of the metering pump can be improved by selecting the explosion-proof motor as the filling motor.
Optionally, the high-pressure pipeline is provided with a pressure gauge for displaying pressure information in the high-pressure pipeline.
Through adopting above-mentioned technical scheme, the manometer can reflect the pressure value in the high-pressure line, and the person of facilitating the use observes whether the measuring pump operates normally.
Optionally, a relief return line is communicated between the high-pressure pipeline and the low-pressure pipeline, and the relief return line is provided with an overflow relief safety valve for relieving pressure when the pressure in the high-pressure pipeline is greater than a preset value; when the overflow load relief valve is in a closed state, the overflow load relief valve prevents the chemical liquid from passing through the discharge return pipeline.
By adopting the technical scheme, when the electric chemical agent injection system works normally, the overflow load relief valve is in a normally closed state and blocks chemical liquid medicine in the discharge return pipeline from flowing out. When the filling pressure of the metering pump to the chemical liquid medicine is larger than a preset value or the high-pressure pipeline and the filling pipeline are blocked, the overflow load relief valve can be automatically opened, so that the chemical liquid medicine in the high-pressure pipeline can flow back to the low-pressure pipeline through the discharge backflow pipeline, the pressure relief effect is achieved, and the chemical liquid medicine is recovered. On the other hand, when the electric chemical injection system finishes chemical injection or needs the electric chemical injection system to overhaul and disassemble, the overflow load relief valve can be opened by a user to release the pressure in the high-pressure pipeline.
Optionally, the low-pressure pipeline is provided with a filter and a calibration pipe in sequence according to the chemical liquid conveying direction.
By adopting the technical scheme, the filter can filter impurities in the chemical liquid medicine, and the interference of the impurities on the metering pump is reduced; the calibration pipe is used for calibrating and calibrating the chemical liquid injection flow of the metering pump.
Optionally, the system further comprises a motor starting control box electrically connected with a preset motor and an instrument junction box electrically connected with a preset measuring instrument, wherein the motor starting control box and the instrument junction box are both electrically connected with the remote terminal.
Through adopting above-mentioned technical scheme, the instrument junction box is arranged in being connected with the detection instrument that predetermines in the electronic chemical injection system, makes remote terminal can receive corresponding detected data and show. The motor starting control box is used for being connected with a preset motor in the electric chemical agent injection system, so that the remote terminal can control the motor to work.
And the liquid storage tank is internally provided with a liquid level transmitter for detecting liquid level data in the liquid storage tank, and the liquid level transmitter is electrically connected with the instrument junction box.
Through adopting above-mentioned technical scheme, liquid level transmitter passes through instrument junction box and establishes communication with remote terminal, and liquid level transmitter detectable liquid storage tank liquid level data send remote terminal, make remote terminal show for the user.
Optionally, the liquid storage tank is provided with a liquid level meter for detecting and displaying liquid level data, the upper end of the liquid level meter is provided with a high limit switch, the lower end of the liquid level meter is provided with a low limit switch, and the high limit switch and the low limit switch are both electrically connected with the instrument junction box;
when the liquid level in the liquid storage tank reaches a preset maximum height value, the high limit switch generates a switching value signal and sends the switching value signal to a remote terminal; when the liquid level in the liquid storage tank reaches a preset height minimum value, the low limit switch generates a switching value signal and sends the switching value signal to the remote terminal.
By adopting the technical scheme, the liquid level meter can be used for a user to observe the liquid level height in the liquid storage tank in real time on site; when the actual liquid level in the liquid storage tank reaches the height of the high limit switch, the high limit switch generates a switching value signal and sends the switching value signal to the remote terminal, and the remote terminal displays a high liquid level alarm signal. When the actual liquid level in the liquid storage tank reaches the height of the low limit switch, the low limit switch generates a switching value signal and sends the switching value signal to the remote terminal, and the remote terminal displays a low liquid level alarm signal.
In summary, the present application includes at least one of the following beneficial technical effects:
1. the automatic remote control of the metering pump is realized, and an operator can remotely adjust the flow of the metering pump through a remote terminal;
2. a user can touch and press keys of the operation key panel to enable the angular travel executing mechanism to adjust the flow, so that the flow of the metering pump can be manually adjusted in a short distance;
3. the explosion-proof motor and the explosion-proof electric stroke controller are selected, so that the safety coefficient of the electric chemical agent injection system can be improved, and the working stability of the electric chemical agent injection system can be improved.
Drawings
Fig. 1 is a schematic structural view of an electromotive chemical injection system according to an embodiment of the present application.
Fig. 2 is a schematic connection diagram of a metering pump and a filling motor according to an embodiment of the present application.
Fig. 3 is a functional block diagram of a stroke adjustment control device according to an embodiment of the present application.
Description of reference numerals:
1. a feedstock unit;
2. a liquid storage assembly; 21. a liquid storage tank; 211. a liquid inlet interface; 2111. a liquid inlet pipeline; 212. a manhole; 213. an exhaust interface; 2131. a storage tank breather valve; 214. an overflow interface; 2141. an overflow conduit; 215. a sewage draining interface; 2151. a blowdown line; 216. a liquid outlet interface; 217. a liquid level interface; 22. a stirring member; 23. a stirring motor; 24. a liquid level meter; 241. an upper liquid level pipe; 242. a lower liquid level pipe; 25. a liquid discharge conduit;
3. a medicament filling assembly; 31. a metering pump; 311. filling a motor; 32. a low pressure line; 321. a filter; 322. calibrating the tube; 33. a high pressure line; 331. a pressure gauge; 332. a pulse damper; 333. a check valve; 34. a bleed return line; 36. an overflow load relief valve; 38. filling a pipeline;
4. a stroke adjustment assembly; 41. an electric angular travel actuator; 42. a stroke adjustment control device; 421. an explosion-proof electric stroke controller; 422. a display module; 423. operating a key panel; 424. a PLC controller; 425. a signal transceiving module; 426. a power supply module;
5. a remote terminal; 51. a station control DCS system; 52. the motor starts the control box; 53. an instrument junction box; 54. an external power supply;
6. a liquid level assembly; 61. a liquid level transmitter; 62. a high limit magnetic liquid level switch; 63. a low limit magnetic liquid level switch.
Detailed Description
In the related art, in the process of drilling or completing a well, chemical liquid medicines such as corrosion inhibitors, scale inhibitors, demulsifiers, flocculants, acids, alkalis and the like need to be injected into a well body such as a crude oil well or a natural gas well to achieve the effects of different processes such as corrosion relief, descaling, wax removal, rust removal, asphalt removal or blockage removal, and the chemical injection system is the core for achieving the effects. The chemical solution is typically stored in a raw unit, which may be a raw tank or a raw pool, and the chemical injection system may retrieve and temporarily store the chemical solution from the raw unit and precisely dose the chemical solution into a designated well. The station-control DCS system is a distributed control system based on a plurality of microprocessors, and having distributed control functions and centralized display operations, and generally, the hardware of the station-control DCS system generally includes an intelligent module based on a microprocessor and various external devices such as a display.
The present application is described in further detail below with reference to figures 1-3.
The embodiment of the application discloses an electric chemical agent injection system capable of automatically adjusting flow. Referring to fig. 1, the electric chemical injection system includes a liquid storage assembly 2 for storing chemical liquid and a chemical injection assembly 3 for injecting the chemical liquid in the liquid storage assembly 2 to a well, so that the electric chemical injection system can sequentially inject the chemical liquid into an external preset injection pipe 38 through the liquid storage assembly 2 and the chemical injection assembly 3, and then the chemical liquid can be injected into a designated well through the injection pipe 38. The electric chemical agent injection system also comprises a skid-mounted seat, and the liquid storage component 2 and the agent injection component 3 are integrally installed on the skid-mounted seat and fixed through bolts, so that a user can conveniently install or move the liquid storage component and the agent injection component; in the embodiment, the skid-mounted seat is formed by welding a carbon steel plate and a carbon steel channel steel.
Referring to fig. 1, the reservoir assembly 2 includes a reservoir tank 21, a stirring member 22 for stirring the chemical solution in the reservoir tank 21, a stirring motor 23 for driving the stirring member 22 to rotate, and a level gauge 24 for indicating a level of the chemical solution in the reservoir tank 21. The liquid storage tank 21 is a cylindrical vertical storage tank, the top end of the liquid storage tank 21 is bolted with a liquid inlet interface 211, a manhole 212 and an exhaust interface 213, the liquid inlet interface 211, the manhole 212 and the exhaust interface 213 are all communicated with the inside of the liquid storage tank 21, and the liquid inlet interface 211 and the exhaust interface 213 are flange interfaces. The liquid inlet joint 211 is in flange connection with a liquid inlet pipeline 2111, and the liquid inlet pipeline 2111 is communicated with the raw material unit 1 to form a liquid inlet channel between the raw material unit 1 and the liquid storage tank 21; the manhole 212 can be used for inspection personnel to enter and exit the liquid storage tank 21 for installation, maintenance or safety inspection; the exhaust port 213 is flanged with a storage tank breather valve 2131 to maintain the internal environment of the storage tank 21 sealed during operation.
Referring to fig. 1, the liquid storage tank 21 is further bolted with an overflow port 214, a sewage draining port 215, a liquid outlet port 216 and two liquid level ports 217, and the overflow port 214, the sewage draining port 215, the liquid outlet port 216 and the liquid level ports 217 are all flange ports which are communicated with the inside of the liquid storage tank 21. The outlet port 216 is located at the bottom end of the reservoir 21 and is used for connecting the drug filling assembly 3 to provide chemical liquid to the drug filling assembly 3. The overflow connector 214 is positioned at the upper part of one side of the liquid storage tank 21, the overflow connector 214 is connected with an overflow pipeline 2141 in a flange mode, and one end, far away from the overflow connector 214, of the overflow pipeline 2141 is communicated with a liquid discharge pipeline 25; the sewage draining interface 215 is positioned at the bottom end of the liquid storage tank 21, the sewage draining interface 215 is in flange connection with a sewage draining pipeline 2151, and one end of the sewage draining pipeline 2151, which is far away from the sewage draining interface 215, is communicated with a liquid draining pipeline 25; in this embodiment, the liquid discharge pipe 25 is connected to a waste liquid collecting device preset outside the electric chemical injection system, so that both the chemical waste liquid overflowing from the overflow pipe 2141 and the chemical waste liquid required to be discharged from the inside of the storage tank from the sewage discharge pipe 2151 can be discharged into the waste liquid collecting device.
Referring to fig. 1, a supporting base is bolted to the middle of the top end of the liquid storage tank 21, and the stirring motor 23 is bolted and fixed to the supporting base in a direction in which the output shaft faces downward. Stirring member 22 wholly holds in stock solution pot 21 with vertical direction, and the lower extreme of stirring member 22 is fixed to be provided with a plurality of and is the stirring leaf that the circumference distributes, and the upper end of stirring member 22 wears to locate the top of stock solution pot 21 and with agitator motor 23's output shaft coaxial coupling, makes agitator motor 23 can drive about stirring member 22 and stirs the chemical liquid medicine in the stock solution pot 21. In this example, the stirring motor 23 may be selected from, but not limited to, an explosion-proof motor.
Referring to fig. 1 and 2, in particular, the chemical filling assembly 3 includes a metering pump 31 for outputting a chemical liquid, a filling motor 311 for powering the metering pump 31, a low-pressure pipeline 32 communicating with the reservoir 21, and a high-pressure pipeline 33 communicating with the filling pipe 38. One end of the low-pressure pipeline 32 is communicated with the inlet end of the metering pump 31, and the other end of the low-pressure pipeline 32 is in flange connection with the liquid outlet port 216; one end of the high-pressure pipeline 33 is communicated with the outlet end of the metering pump 31, and the other end of the high-pressure pipeline 33 is in flange connection with the filling pipeline 38, so that a chemical liquid passage among the liquid storage tank 21, the metering pump 31 and the filling pipeline 38 is formed.
Referring to fig. 2, the metering pump 31 may perform the delivery by applying a filling pressure to the chemical liquid in the cylinder by changing the volume space in the cylinder, so that the pressure in the high pressure line 33 is higher than the pressure in the low pressure line 32 in the operating state. The filling motor 311 is provided with a junction box 3111 for receiving a control signal of the upper computer, and the junction box 3111 is electrically connected with a power cable; the filling motor 311 is relatively fixed to the metering pump 31, and an output shaft of the filling motor 311 is connected to a drive shaft of the metering pump 31 through an i-shaped flange coupling. As a power source of the filling motor 311, in order to improve the safety of the metering pump 31, the filling motor 311 is an explosion-proof motor; the junction box 3111 is an explosion-proof junction box.
Referring to fig. 1, the low pressure pipeline 32 is sequentially provided with a filter 321 and a calibration pipe 322 according to the conveying direction of the chemical liquid, wherein the filter 321 can filter impurities in the chemical liquid to reduce interference of the impurities on the metering pump 31; the calibration pipe 322 is used to calibrate and calibrate the chemical injection flow rate of the metering pump 31. The high-pressure pipeline 33 is sequentially provided with a discharge backflow pipeline 34, a pressure gauge 331, a pulse damper 332 and a check valve 333 according to the conveying direction of the chemical liquid medicine, wherein the pressure gauge 331 can reflect the pressure value in the high-pressure pipeline 33, so that a user can conveniently observe whether the metering pump 31 operates normally, and in the embodiment, the pressure gauge 331 is an electronic digital pressure gauge 331; the pulse damper 332 can eliminate partial pressure in the high-pressure pipeline 33, so that the pressure value of the high-pressure pipeline 33 is maintained within a preset range; the check valve 333 reduces the risk of chemical liquid flowing back from the fill line 38 into the high-pressure line 33.
Referring to fig. 1, both ends of a bleed-off return line 34 communicate with a high-pressure line 33 and a low-pressure line 32, respectively, and the bleed-off return line 34 is provided with an overflow relief valve 36. When the electric chemical injection system normally works, the overflow load relief valve 36 is in a normally closed state and blocks the chemical liquid in the discharge return line 34 from passing through, which is equivalent to blocking the chemical liquid in the high-pressure line 33 from returning to the low-pressure line 32. When the filling pressure of the metering pump 31 to the chemical liquid is greater than the preset value or the high-pressure pipeline 33 and the filling pipeline 38 are blocked, the overflow load-relief safety valve 36 is automatically opened, so that the chemical liquid in the high-pressure pipeline 33 can flow back to the low-pressure pipeline 32 through the discharge return pipeline 34, and the effect of pressure relief is achieved.
On the other hand, when the electric chemical injection system has completed injecting the chemical solution or needs the electric chemical injection system to be repaired or disassembled, the user can open the overflow relief valve 36 to communicate the low pressure pipeline 32 with the outside air, thereby releasing the pressure in the low pressure pipeline 32 and reducing the time for maintaining the high pressure state of the low pressure pipeline 32. When the electrokinetic chemical injection system is required to operate properly, the user may close the overflow relief valve 36.
Referring to fig. 1 and 2, specifically, the metering pump 31 is an electric plunger type metering pump 31. The metering pump 31 is provided with a plunger which can change the stroke length of the metering pump 31 in a moving mode and a stroke length adjusting part which can drive the plunger to move in a rotating mode, under a certain effective plunger cylinder sectional area, the volume flow of the chemical liquid medicine output by the metering pump 31 is in direct proportion to the length of the stroke and the frequency of the stroke, under the condition that the rotating speed of the filling motor 311, namely the frequency of the stroke is not changed, the output flow of the metering pump 31 is directly in positive correlation with the length of the stroke, and a user can change 310% -100% of the stroke length of the metering pump in a mode of rotating the stroke length adjusting part, so that the flow of the metering pump 31 is adjusted.
Referring to fig. 1, further, in order to remotely automate the flow adjustment of the metering pump 31, the electro-chemical injection system further includes a stroke adjustment assembly 4 for adjusting the outflow rate of the chemical filling assembly 3. The stroke adjusting assembly 4 comprises an electric angle stroke executing mechanism 41 and a stroke adjusting control device 42, wherein the stroke adjusting control device 42 is electrically connected with the electric angle stroke executing mechanism 41; the body of the electric angular travel actuator 41 is relatively fixed to the metering pump 31, and the driving end of the electric angular travel actuator 41 is coaxially connected to the stroke length adjusting member of the metering pump 31. The electric angular stroke actuator 41 drives the stroke length adjusting member of the metering pump 31 to rotate to change the angle of the stroke length adjusting member of the metering pump 31, thereby changing the flow rate of the metering pump 31.
Referring to fig. 1 and 3, the stroke adjustment control means 42 is used for information interaction with the remote terminal 5 outside the electro-chemical agent injection system. In this embodiment, the stroke adjustment control device 42 selects the explosion-proof electric stroke controller 421, the remote terminal 5 is the station-control DCS system 51, and the explosion-proof electric stroke controller 421 is electrically connected to the station-control DCS system 51 through a hard-wired cable. The flow rate adjusting mode of the variable metering pump 31 includes a remote automatic pump flow rate adjusting mode, in which the explosion-proof electric stroke controller 421 outputs a stroke length adjusting signal to the electric angular stroke actuator 41 based on a remote flow rate adjusting signal sent by the station-controlled DCS system 51, so as to rotate a stroke length adjusting member of the metering pump 31, thereby realizing remote automatic adjustment of the output flow rate of the metering pump 31.
Referring to fig. 1 and 3, in particular, the explosion-proof electric stroke controller 421 includes a control module, a display module 422, an operation key panel 423, a signal transceiver module and a power supply module; the display module 422, the operation key panel 423, the signal transceiver module 425 and the power supply module 426 are electrically connected with the control module, wherein the control module is a PLC controller 424; the signal transceiver module 425 is used for establishing signal transmission between the PLC controller 424 and the station-controlled DCS system 51; the power supply module 426 is electrically connected to the external power source 54 and is used for supplying power to the control module; the display module 422 is a digital display screen, and a user can view the working state of the electric angular travel actuator 41 through the display module 422 to obtain the current flow information of the metering pump 31.
In this embodiment, the signal transceiver module 425 may receive the 4 to 20mA remote control signals from the station-control DCS system 51 by using a digital/analog control technology, and the PLC 424 may output 4 to 20mA flow adjustment signals to the electric angular travel actuator 41 through the flow curve program operation of the PLC 424, so that the angular travel actuator performs flow adjustment. Alternatively, the user may send an adjustment command to the PLC controller 424 by touching a key of the operation key panel 423, and the PLC controller 424 outputs a flow rate adjustment signal to the electric angular stroke actuator 41 based on the adjustment direction, so that the angular stroke actuator performs flow rate adjustment. Therefore, the flow rate adjustment method of the metering pump includes automatic adjustment performed by a user by presetting a flow rate adjustment time in the station-control DCS system 51, remote manual adjustment performed by a user directly controlled in the station-control DCS system 51, and close manual adjustment performed by a user directly controlled in the operation key panel 423.
Referring to fig. 1 and 2, in particular, the electric chemical injection system further includes a motor start control box 52 and an instrument connection box 53, wherein the motor start control box 52 and the instrument connection box 53 are both bolted to the skid-mounted seat and both adopt explosion-proof boxes; the instrument junction box 53 is used for connecting various measuring instruments preset in the electric chemical agent injection system; the motor start control box 52 is used for connecting a motor preset in the electric chemical injection system. The motor starting control box 52 and the instrument junction box 53 are both electrically connected with the station control DCS system 51 through an external transfer multi-core signal cable; in the present embodiment, the stirring motor 23 and the filling motor 311 are both electrically connected to the motor start control box 52. Specifically, the 380vac,50hz three-phase ac power supply power cable from the station low-voltage power distribution cabinet is electrically connected to the motor start control box 52, so that the motor start control box 52 provides power distribution and start-stop control for the stirring motor 23 and the filling motor 311, respectively, and a user can remotely monitor or control the working state of the stirring motor 23 through the station control DCS 51.
Referring to fig. 1, the electro-chemical injection system further includes a liquid level assembly 6 for detecting liquid level data in the liquid storage tank 21 and displaying or alarming based on the detected data, and the liquid level assembly 6 includes a liquid level transmitter 61, a liquid level gauge 24, a high limit switch 62 and a low limit switch 63.
Referring to fig. 1, the liquid level transmitter 61 is a static pressure type liquid level transmitter, the liquid level transmitter 61 is disposed at the bottom of the inner cavity of the liquid storage tank 21, and the liquid level transmitter 61 is electrically connected to the instrument junction box 53 through a signal cable. The liquid level transmitter can transmit and output 4-20 mA continuous liquid level signals and transmit the signals to the station control DCS 51, and the station control DCS 51 realizes remote transmission display of chemical liquid continuous liquid level data in the liquid storage tank 21.
Referring to fig. 1, the level gauge is a magnetic float level gauge 24, the high limit switch is a high limit magnetic level switch 62, and the low limit switch is a low limit magnetic level switch 63.
The two liquid level interfaces 217 are located at one side of the liquid storage tank 21 and are distributed up and down. The liquid level meter 24 is arranged in the vertical direction, and the upper end and the lower end of the magnetic floater liquid level meter 24 are respectively connected with two liquid level interfaces 217. A high limit magnetic level switch 62 is provided at the upper end of the magnetic float level gauge 24 and a low limit magnetic level switch 63 is provided at the lower end of the magnetic float level gauge 24.
When the liquid level of the chemical liquid in the liquid storage tank 21 reaches a set high limit, the high limit magnetic liquid level switch 62 generates a switching value signal and sends the switching value signal to the station control DCS 51 to display a high liquid level alarm signal; similarly, when the liquid level of the chemical liquid in the liquid storage tank 21 falls to the set lower limit, the lower limit magnetic liquid level switch 63 generates a switching value signal and sends the switching value signal to the station control DCS system 51 to perform low liquid level alarm display. In addition, when the station control DCS system 51 sends out a low liquid level alarm, the remote pump stop of the metering pump can be controlled in an interlocking mode, so that chemical liquid in the liquid storage tank is prevented from being pumped out.
The implementation principle of the electric chemical injection system capable of automatically adjusting the flow is as follows: through the cooperation of the stroke adjusting and controlling device 42 and the electric angular travel executing mechanism 41, the metering pump 31 can realize automatic remote control, an operator can remotely adjust the flow of the metering pump 31 through the station control DCS system 51 in a central control room, and the operator can manually adjust the flow value of the metering pump 31 through the operation key panel 423 on the spot, so that the traditional mechanical operation is replaced, the convenience of operation is improved, and the production efficiency can be greatly improved. In addition, the mixing motor 23 and the filling motor 311 are both explosion-proof motors, and the stroke adjusting and controlling device 42 is an explosion-proof electric stroke controller, so that the safety factor of the electric chemical agent injection system can be improved, and the working stability of the electric chemical agent injection system can be improved.
The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.
Claims (7)
1. An electric chemical injection system capable of automatically adjusting flow rate, which is applied to the technological process of exploration or mineral engineering development and is used for obtaining chemical liquid medicine from a raw material unit (1) and accurately and quantitatively injecting the chemical liquid medicine into a specified well body, and the system comprises:
the chemical liquid injection device comprises a medicament injection assembly (3) and a control system, wherein the medicament injection assembly (3) is used for delivering chemical liquid in a liquid storage assembly (2) to a well body through an injection pipeline (38), and comprises a low-pressure pipeline (32), a metering pump (31) and a high-pressure pipeline (33) which are sequentially arranged and communicated according to the liquid transmission direction; the high-pressure pipeline (33) is sequentially provided with a discharge backflow pipeline (34), a pressure gauge (331), a pulse damper (332) and a check valve (333) according to the conveying direction of the chemical liquid medicine, wherein the pressure gauge (331) is used for reflecting the pressure value in the high-pressure pipeline (33); the pulse damper (332) is used for eliminating partial pressure in the high-pressure pipeline (33) so that the pressure value of the high-pressure pipeline (33) is maintained within a preset range; the check valve (333) reduces the risk of backflow of the chemical liquid from the filling line (38) to the high-pressure line (33);
the liquid storage component (2) is used for storing chemical liquid medicine, the liquid storage component (2) comprises a liquid storage tank (21), and the liquid storage tank (21) is provided with a liquid inlet interface (211) communicated with the raw material unit (1) and a liquid outlet interface (216) communicated with the low-pressure pipeline (32);
the stroke adjusting assembly (4) is used for adjusting the liquid outlet flow of the medicament filling assembly (3), the stroke adjusting assembly (4) comprises an electric angle stroke executing mechanism (41) for driving a stroke length adjusting part of the metering pump (31) to rotate and a stroke adjusting control device (42) for carrying out information interaction with a remote terminal (5), and the stroke adjusting control device (42) is electrically connected with the electric angle stroke executing mechanism (41); the stroke adjusting control device (42) outputs a stroke length adjusting signal for driving the electric angle stroke actuating mechanism (41) to work to the electric angle stroke actuating mechanism (41) based on a remote flow adjusting signal sent by a remote terminal (5); the body of the electric angular travel executing mechanism (41) is relatively fixed with the metering pump (31), and the driving end of the electric angular travel executing mechanism (41) is coaxially connected with the stroke length adjusting piece of the metering pump (31); the electric angular stroke executing mechanism (41) drives the stroke length adjusting piece of the metering pump (31) to rotate so as to change the angle of the stroke length adjusting piece of the metering pump (31) and further change the flow of the metering pump (31);
the medicament filling assembly (3) further comprises a filling motor (311) used for providing power for the metering pump (31), and the filling motor (311) is a low-pressure explosion-proof motor;
a discharge return pipeline (34) is communicated between the high-pressure pipeline (33) and the low-pressure pipeline (32) in a bypass mode of bypassing a metering pump (31), and the discharge return pipeline (34) is provided with an overflow load relief valve (36) for relieving pressure when the pressure in the high-pressure pipeline (33) is greater than a preset value; the overflow load relief valve (36) prevents chemical liquid from flowing through the discharge return line (34) when the overflow load relief valve (36) is in a closed state.
2. The electrokinetic chemical agent injection system of claim 1, wherein: the stroke adjusting control device (42) comprises a control module, a display module (422) for displaying stroke data of the metering pump (31), an operation key panel (423) for sending an execution instruction to the control module, a signal transceiving module (425) for realizing signal transmission with a remote terminal (5), and a power supply module (426) for supplying power to the control module, wherein the display module (422), the operation key panel (423), the signal transceiving module (425) and the power supply module (426) are electrically connected with the control module.
3. The electrokinetic chemical agent injection system of claim 1, wherein: the stroke adjusting control device (42) is an explosion-proof electric stroke controller (421).
4. The electrokinetic chemical agent injection system of claim 1, wherein: the low-pressure pipeline (32) is sequentially provided with a filter (321) and a calibration pipe (322) according to the conveying direction of the chemical liquid medicine.
5. The electrokinetic chemical agent injection system of claim 1, wherein: the motor starting control box (52) is electrically connected with a preset motor, the instrument junction box (53) is electrically connected with a preset measuring instrument, and the motor starting control box (52) and the instrument junction box (53) are electrically connected with the remote terminal (5).
6. The electrokinetic chemical agent injection system of claim 5, wherein: be provided with in liquid storage pot (21) and be used for detecting liquid level data's in liquid storage pot (21) liquid level transmitter (61), liquid level transmitter (61) with instrument junction box (53) electric connection.
7. The electrokinetic chemical agent injection system of claim 5, wherein: the liquid storage tank (21) is provided with a liquid level meter (24) used for detecting and displaying liquid level data, the upper end of the liquid level meter (24) is provided with a high limit switch (62), the lower end of the liquid level meter (24) is provided with a low limit switch (63), and the high limit switch (62) and the low limit switch (63) are both electrically connected with the instrument junction box (53);
when the liquid level in the liquid storage tank (21) reaches a preset maximum height value, the high limit switch (62) generates a switching value signal and sends the switching value signal to the remote terminal (5); when the liquid level in the liquid storage tank (21) reaches a preset height minimum value, the low limit switch (63) generates a switching value signal and sends the switching value signal to the remote terminal (5).
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| IE54031B1 (en) * | 1982-01-29 | 1989-05-24 | Perkin Elmer Corp | Solvent delivery system |
| DE19654084C1 (en) * | 1996-12-23 | 1998-04-23 | Lang Apparatebau Gmbh | Method of increasing dosing accuracy of liquid dosing pump driven by asynchronous motor with eccentric gear |
| CN200999723Y (en) * | 2006-11-02 | 2008-01-02 | 汉胜工业设备(上海)有限公司 | Dosage pump electric stroke controller |
| CN204028676U (en) * | 2014-08-07 | 2014-12-17 | 浙江工业大学 | There is the electronic stroke adjusting device of volume pump of long-range operation controlling functions |
| CN205015745U (en) * | 2015-10-10 | 2016-02-03 | 杨晓林 | Add medicine flow closed loop control system based on measuring pump |
| CN106681268A (en) * | 2017-02-28 | 2017-05-17 | 浙江大维高新技术股份有限公司 | Intelligent on-line medicament adding system |
| CN208153001U (en) * | 2018-04-16 | 2018-11-27 | 陕西明特石油技术有限公司 | The long-range control more accurate quantitative filling devices of pit shaft desulfurizing agent of well group |
| CN108958194A (en) * | 2018-07-19 | 2018-12-07 | 广州喜马拉雅环保科技有限公司 | A kind of long-range medicine system of boiler based on data cloud and method |
| CN109980997A (en) * | 2019-04-12 | 2019-07-05 | 艺达思科技（苏州）有限公司 | Metering pump, frequency-variable controller and its control method |
| CN211422615U (en) * | 2019-11-04 | 2020-09-04 | 中国石油大学(北京) | Polymer microsphere dosing device |
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