CN110201423B - Automatic water cutting device based on rotation method - Google Patents
Automatic water cutting device based on rotation method Download PDFInfo
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- CN110201423B CN110201423B CN201910349122.4A CN201910349122A CN110201423B CN 110201423 B CN110201423 B CN 110201423B CN 201910349122 A CN201910349122 A CN 201910349122A CN 110201423 B CN110201423 B CN 110201423B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 172
- 238000005520 cutting process Methods 0.000 title claims abstract description 111
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 55
- 238000001514 detection method Methods 0.000 claims abstract description 53
- 239000002184 metal Substances 0.000 claims abstract description 24
- 238000005070 sampling Methods 0.000 claims description 11
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 238000004140 cleaning Methods 0.000 abstract description 3
- 238000012423 maintenance Methods 0.000 abstract description 3
- 230000000737 periodic effect Effects 0.000 abstract description 2
- 239000003921 oil Substances 0.000 description 66
- 239000000523 sample Substances 0.000 description 30
- 238000004457 water analysis Methods 0.000 description 8
- 238000007667 floating Methods 0.000 description 6
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 238000004458 analytical method Methods 0.000 description 3
- 239000012488 sample solution Substances 0.000 description 3
- 230000000903 blocking effect Effects 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 239000010779 crude oil Substances 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002283 diesel fuel Substances 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000002592 echocardiography Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000295 fuel oil Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000010705 motor oil Substances 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
- B01D17/02—Separation of non-miscible liquids
- B01D17/0208—Separation of non-miscible liquids by sedimentation
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention relates to the technical field of petrochemical industry, in particular to an automatic water cutter based on a rotation method. In the detection sample liquid with different viscosities, the rotation speeds of the metal rotors with constant torque have obvious difference, so that oil and water can be accurately distinguished according to the rotation speeds, and automatic water cutting is realized. The water cutting device can be suitable for various different oil products, and effectively avoids the adhesion of detection sample liquid on the detection component by virtue of the centrifugal force generated by high-speed rotation of the motor, so that the accuracy cannot be influenced by the adhesion of the detection sample liquid, the water cutting device can be operated for a long time without periodic cleaning and maintenance, and the water cutting cost is reduced while the accuracy is improved.
Description
Technical Field
The invention relates to the technical field of petrochemical industry, in particular to an automatic water cutting device based on a rotation method.
Background
In petrochemical industry enterprise storage tanks, crude oil or finished oil inevitably contains certain moisture, and the existence of the moisture influences the quality of oil products, so that the burden is brought to subsequent processing treatment, and even equipment damage and safety accidents are caused seriously. For example, the high water content of diesel oil can cause corrosion and damage to engine cylinders, valves and pistons. Therefore, the oil products are stored in the oil tank, and the water is deposited at the bottom of the storage tank by virtue of the principle that the water density is higher than that of the oil products. After the water is accumulated to a certain extent, opening a valve at the bottom of the tank to discharge the water, and the process is that the oil tank cuts water.
At present, the oil tank is cut into water in two modes of manual operation and automatic operation. The manual water cutting is to distinguish oil and water by eyes, so that the time for closing the valve is difficult to grasp, the oil is often wrongly discharged to the drainage system, the waste of the oil and the environmental pollution are caused, and the operation cost of enterprises is increased. The water cut per diesel tank per year was found to be about 180 tons, with about 10 tons of oil if manual cutting is used. And most of the oil contains harmful substances such as hydrogen sulfide, and the health of operators is damaged. Therefore, the adoption of the automatic water cutting equipment tends to be the trend of the oil tank water cutting equipment selection, and is a necessary requirement for safe production, environmental protection and efficiency improvement.
The automatic water cutting is to identify oil and water by means of mechanical and electronic devices, if water is, the valve is opened automatically to cut water, and after the oil content in the water reaches a certain degree, the valve is closed immediately. Automatic water cutting devices currently in use are broadly divided into two main categories: float ball type (mechanical type) and oil-water analysis type (electronic type). (1) floating ball type: the floating ball floats upwards when the water content is high by utilizing the density difference principle of oil and water, the valve is opened, the floating ball falls downwards when the oil content is high, and the valve is closed. The floating ball type automatic water cutting device is subjected to continuous optimization and improvement, and is widely applied to a plurality of petrochemical enterprises. However, in practical application, the floating ball type water cutter is found to have a plurality of problems, namely, when the water cutter works continuously, the water cutter drain valve may malfunction due to factors such as corrosion, impurities and the like for a long time, or the lever mechanism corrodes and is blocked, and once the blocking failure occurs, huge direct economic loss, potential safety hazard, environmental pollution and the like are brought. (2) oil-water analysis formula: the oil-water analysis type oil-water content is detected by using a viscosity sensor, a density sensor and the like, and the opening and closing of the valve are controlled, so that the oil-water analysis type oil-water valve is safer and more reliable than a mechanical type oil-water analysis type oil-water valve. The existing oil-water analysis type automatic water cutting device comprises an ultrasonic automatic water cutting device, an image detection automatic water cutting device, a liquid column resonance automatic water cutting device and the like. The ultrasonic automatic water cutting device utilizes the difference of the transmission rates of ultrasonic waves in water and oil, the ultrasonic waves are incident into liquid through the tank wall, the field controller detects and calculates ultrasonic wave echoes of the upper sensor and the lower sensor, and the oil-water interface in the tank is judged according to the ultrasonic wave echo time difference of the upper sensor and the lower sensor. If the water level reaches or exceeds the water cutting level, the on-site controller generates a water cutting signal to drive the water cutting valve to cut water after a certain time delay. In the water cutting process, if the oil-water interface in the tank is lower than the water cutting water level, the system stops cutting water, and the water cutting process is completed. The method has the advantages that the sensor is not in direct contact with the medium and is not limited by the viscosity of the medium, but the accuracy requirement on the ultrasonic sensor is high, and different sensors are selected according to different oil types, so that the universality is poor. The automatic water cutting device for image detection realizes real-time water cutting of the tank through video image acquisition and processing according to the basic fact that the water and the oil have obvious differences in color. However, the scheme has high requirements on the working environment, and greasy dirt, dust and the like can influence image acquisition to cause result distortion, so that the application of the scheme is limited. The liquid column resonance automatic water cutting device is based on that at a certain temperature, each fluid has its own resonance frequency. When the oil content in water changes slightly, the resonance frequency and the amplitude of the water change greatly, so that the water and the oil can be distinguished correctly. The disadvantage of this method is that the adhesion of the oil to the sensor leads to inaccurate measurement results, thus requiring regular cleaning and replacement of the sensor, and maintenance needs to be improved; these are not expected by the person skilled in the art.
Disclosure of Invention
In order to solve the above problems, the present invention discloses an automatic water cutting device based on a rotation method, which comprises: the device comprises an oil tank, a water cutting detector, a water cutting controller, a water cutting valve, a sampling pump and a drainage pipeline;
the water cutting detector comprises a sample liquid detection chamber, a rotor, a motor and a rotating speed detection device; the liquid inlet of the sample liquid detection chamber is communicated with the bottom of the oil tank through a pipeline, the output torque of the motor is constant, the rotor stretches into the sample liquid detection chamber and is connected with the output shaft of the motor to rotate under the drive of the motor, and the rotating speed detection device is connected with the motor to be used for measuring the rotating speed of the rotor;
the water cutting valve is connected between the oil tank and the drainage pipeline;
the water cutting controller is connected between the rotating speed detection device and the water cutting valve so as to control the switch of the water cutting valve according to the rotating speed of the rotor.
Further, the rotation speed detection device is connected with an output shaft of the motor through a coupler.
Further, the rotation speed detection device is a rotation speed sensor.
Further, the rotation speed detection device is an encoder.
Further, the rotor is a metal rod.
Further, a rotating speed threshold value is preset by the water cutting controller, and when the rotating speed output by the rotating speed sensor is greater than or equal to the rotating speed threshold value, the water cutting controller controls the water cutting valve to be opened;
when the rotating speed output by the rotating speed sensor is smaller than the rotating speed threshold value, the water cutting controller controls the water cutting valve to be opened.
Further, a liquid outlet of the sample liquid detection chamber is communicated with the oil tank through a sampling pump.
Further, the water cutting controller is connected with the sampling pump.
Further, a motion mechanical seal is further arranged on an output shaft of the motor.
Further, the motion mechanical seal is made of rubber.
Compared with the prior art, the invention has the following advantages or beneficial effects:
1. Compared with the existing 'floating ball' automatic water cutting device, the water cutting device detects the oil-water content by utilizing the rotation of the metal rotor, controls the valve to be opened and closed, has no blocking fault of a mechanical structure, and is safer and more reliable.
2. Compared with the existing oil-water analysis type water cutting device, the water cutting device can effectively avoid the adhesion of oil on the metal rotor by means of the centrifugal force generated by high-speed rotation of the motor, and the accuracy cannot be affected due to the adhesion of the oil in long-term operation, so that the water cutting device does not need to be cleaned and maintained regularly.
Drawings
The invention and its features, aspects and advantages will become more apparent from the detailed description of non-limiting embodiments with reference to the following drawings. Like numbers refer to like parts throughout. The drawings may not be to scale, emphasis instead being placed upon illustrating the principles of the invention.
FIG. 1 is a schematic diagram of a water cut detector in an embodiment of the invention;
FIG. 2 is a schematic structural view of an automatic water cutting device based on a rotation method in an embodiment of the present invention;
FIG. 3 is a flowchart of the operation of the water cut controller in an embodiment of the present invention.
Detailed Description
The invention will now be further described with reference to the accompanying drawings and specific examples, which are not intended to limit the invention.
As shown in fig. 1 to 3, the present embodiment relates to an automatic water cutter based on a rotation method, which can be used for cutting water from an oil tank; specifically, the automatic water cutting device comprises: an oil tank 5, a water cut detector 1, a water cut controller 2, a water cut valve 3, a sampling pump 4 and a drainage pipeline 6.
The oil tank 5 stores therein an aqueous oil material such as crude oil or fuel oil, and water is deposited on the bottom of the oil tank 5 after sedimentation because the density of water is higher than that of oil.
The water cutting detector 1 comprises a sample liquid detection chamber 11, a metal rotor 12 (the metal rotor 12 can be a metal rod), a motor 15, a coupler 16 and a rotating speed detection device 17; the liquid inlet of the sample liquid detection chamber 11 is communicated with the bottom of the oil tank 5 through a pipeline, under the action of static pressure, liquid (the liquid is water, but may also comprise oil) precipitated at the bottom of the oil tank 5 is pressed into the sample liquid detection chamber 11 to be detected as detection sample liquid, and the liquid outlet of the sample liquid detection chamber 11 is communicated with the oil tank 5 through a sampling pump 4, so that the sampling pump 4 can continuously extract samples from the sample liquid detection chamber 11 to return to the oil tank 5, and the consistency of the characteristics of the samples in the sample liquid detection chamber 11 and the liquid at the bottom of the oil tank 5 is ensured. The motor 15 outputs constant torque, and the output shaft 13 of the motor 15 is also provided with a motion mechanical seal 14 to prevent the overflow of the detection sample liquid rotating at high speed, thereby affecting the operation of the motor 15; the metal rotor 12 extends into the sample liquid detection chamber 11 and is connected with the output shaft 13 of the motor 15 so as to rotate in the detection sample liquid under the drive of the motor 15; the above-mentioned rotation speed detecting device 17 is connected to the motor 15 through the coupling 16 for measuring the rotation speed of the metal rotor 12, that is, the motor 15 drives the metal rotor 12 to rotate in the detected sample liquid in the sample liquid detecting chamber 11 with a constant torque, since the rotation speed of the motor 15 is related to the output torque of the motor 15 and the power of the motor 15, the rotation speed of the motor 15 is constant under the condition that both the torque and the power are constant, and thus, in theory, the rotation speed of the metal rotor 12 is constant under the condition that the metal rotor 12 is not subject to any resistance, however, the viscosity of the detected sample liquid in the sample liquid detecting chamber 11 inevitably affects the rotation speed of the metal rotor 12, as well known, the viscosity difference of water and oil is very large, the viscosity of pure water is generally 1 centipoise, and the viscosity of engine oil is about 80 centipoise, so that the viscous resistance of water and oil is remarkably different. When water and oil form a mixture, viscous resistance increases with an increase in oil content, so that the rotational speed of the metal rotor 12 decreases with an increase in oil content of the sample liquid detected in the sample liquid detection chamber 11, so that oil and water can be accurately distinguished according to the rotational speed of the metal rotor 12, and since the metal rotor 12 is connected to the output shaft 13 of the motor 15, the rotational speed detection device 17 is connected to the motor 15 through the coupling 16, and the motor 15 can transmit the rotational speed of the metal rotor 12 to the rotational speed detection device 17 through the coupling 16.
In the embodiment of the present invention, the water cut valve 3 is connected between the oil tank 5 and the water drain pipe 6, specifically, the water drain pipe 6 is connected to the pipe between the oil tank 5 and the sample liquid detecting chamber 11 through the water cut valve 3, that is, the water cut valve 3 is opened, the oil tank 5 and the water drain pipe 6 are connected to drain the liquid at the bottom of the oil tank 5 into the water drain pipe 6, the water cut valve 3 is closed, the oil tank 5 and the water drain pipe 6 are not connected, and the liquid at the bottom of the oil tank 5 cannot be drained into the water drain pipe 6; the water cutting controller 2 is connected between the rotation speed detecting device 17 and the water cutting valve 3 to control the opening and closing of the water cutting valve 3 according to the rotation speed of the metal rotor 12, and it should be noted that the method and software flow of the water cutting controller 2 according to the invention for controlling the opening and closing of the water cutting valve 3 according to the rotation speed of the metal rotor 12 can be adopted by those skilled in the art; specifically, in the present invention, a rotation speed threshold value (the rotation speed threshold value is a rotation speed corresponding to a metal rotor when the oil content reaches a preset value) is preset in the water cutting controller 2, the function of the water cutting controller 2 is to read the rotation speed output by the rotation speed detecting device 17 and compare with the preset rotation speed threshold value to determine whether the oil content in the detected sample liquid exceeds the standard, when the rotation speed output by the rotation speed sensor is greater than or equal to the rotation speed threshold value, that is, the viscosity of the sample liquid in the sample liquid detecting chamber 11 is lower, and the oil content is lower than or equal to the oil content threshold value corresponding to the preset rotation speed threshold value, the water cutting controller 2 determines that the detected sample liquid is water-dischargeable, the water cutting controller 2 sends a start water cutting command to control the water cutting valve 3 to open to enter a water cutting state so as to discharge the liquid at the bottom of the oil tank 5 into the drain pipe 6; when the rotation speed output by the rotation speed detection device 17 is smaller than the rotation speed threshold, namely the viscosity of the sample solution in the sample solution detection chamber 11 is higher, the oil content is higher than the oil content threshold corresponding to the preset rotation speed threshold, the water cutting controller 2 judges that the oil content in the detected sample solution exceeds the standard, and then the water cutting controller 2 sends out a water cutting stopping command, and the water cutting valve 3 is closed, so that the liquid at the bottom of the oil tank 5 cannot be discharged into the drainage pipeline.
In the embodiment of the present invention, as shown in fig. 3, the working flow of the water cutting controller 2 specifically includes:
Step S1, starting;
Step S2, initializing a motor 15 of the water cutting detector 1;
Step S3, initializing a water cutting valve 3;
step S4, starting the motor 15 of the water cutting detector 1;
Step S5, detecting whether the motor 15 of the water cutting detector 1 fails, if the motor 15 of the water cutting detector 1 does not fail, directly proceeding to the next step, and if the motor 15 of the water cutting detector 1 fails, proceeding to step S12;
Step S6, measuring the rotation speed of the motor 15 of the water cutting detector 1 through the rotation speed detection device 17;
step S7, oil-water analysis is carried out, namely the rotating speed of the motor 15 of the water cutting detector 1 is compared with a rotating speed threshold preset by the water cutting controller 2;
S8, judging whether the oil content in the detection sample liquid exceeds a preset value according to a comparison result; if the preset value is exceeded, the water cutting valve 3 is set to be closed, and if the preset value is not exceeded, the water cutting valve 3 is set to be opened;
step S9, reading back the state of the water cutting valve 3;
step S10, judging that the state of the water cutting valve 3 is consistent with the analysis result, if the state of the water cutting valve 3 is consistent with the analysis result, judging that the state is correct, and returning to the step S5; if the state of the water cutting valve 3 is not consistent with the analysis result, judging that the state is wrong, and carrying out the next step;
Step S11, outputting an alarm;
step S13, cutting off the power supply;
Step S14, end.
Preferably, the rotation speed detecting device 17 is a rotation speed sensor or an encoder, and the rotation speed detecting device 17 can detect the rotation speed of the metal rotor 12 and output the rotation speed to the switching controller 2.
Preferably, the motor 15 is a servo motor.
Preferably, the material of the motion seal 14 is rubber, so as to improve the sealing effect of the motion seal 14.
Preferably, the water cut controller 2 is connected to the sampling pump 4 to control the frequency of pumping the detection solution from the sampling pump 4 to the oil tank.
In summary, the invention discloses an automatic water cutter based on a rotation method, which is based on a detection principle of liquid viscosity, and drives a metal rotor to rotate in a detection sample liquid by utilizing a motor with constant torque. In the detection sample liquid with different viscosities, the rotation speeds of the metal rotors with constant torque have obvious difference, so that oil and water can be accurately distinguished according to the rotation speeds, and automatic water cutting is realized. The water cutting device can be suitable for various different oil products, and effectively avoids the adhesion of detection sample liquid on the detection component by virtue of the centrifugal force generated by high-speed rotation of the motor, so that the accuracy cannot be influenced by the adhesion of the detection sample liquid, the water cutting device can be operated for a long time without periodic cleaning and maintenance, and the water cutting cost is reduced while the accuracy is improved.
Those skilled in the art will understand that the skilled person can implement the modification in combination with the prior art and the above embodiments, and this will not be repeated here. Such modifications do not affect the essence of the present invention, and are not described herein.
The preferred embodiments of the present invention have been described above. It is to be understood that the invention is not limited to the specific embodiments described above, wherein devices and structures not described in detail are to be understood as being implemented in a manner common in the art; any person skilled in the art can make many possible variations and modifications to the technical solution of the present invention or modifications to equivalent embodiments without departing from the scope of the technical solution of the present invention, using the methods and technical contents disclosed above, without affecting the essential content of the present invention. Therefore, any simple modification, equivalent variation and modification of the above embodiments according to the technical substance of the present invention still fall within the scope of the technical solution of the present invention.
Claims (8)
1. An automatic water cutting device based on a rotation method, which is characterized by comprising: the device comprises an oil tank, a water cutting detector, a water cutting controller, a water cutting valve and a drainage pipeline;
the oil tank stores water-containing oil;
the water cutting detector comprises a sample liquid detection chamber, a rotor, a motor and a rotating speed detection device; the liquid inlet of the sample liquid detection chamber is communicated with the bottom of the oil tank through a pipeline, the output torque of the motor is constant, the rotor stretches into the sample liquid detection chamber and is connected with the output shaft of the motor to rotate under the drive of the motor, and the rotating speed detection device is connected with the motor to be used for measuring the rotating speed of the rotor;
The liquid outlet of the sample liquid detection chamber is communicated with the oil tank through a sampling pump, so that the sampling pump can continuously extract samples from the sample liquid detection chamber and return the samples to the oil tank;
the water cutting valve is connected between the oil tank and the drainage pipeline;
the water cutting controller is connected between the rotating speed detection device and the water cutting valve to control the switch of the water cutting valve according to the rotating speed of the rotor, a rotating speed threshold is preset in the water cutting controller, and when the rotating speed output by the rotating speed detection device is greater than or equal to the rotating speed threshold, the water cutting controller controls the water cutting valve to be opened; and when the rotating speed output by the rotating speed detection device is smaller than the rotating speed threshold value, the water cutting controller controls the water cutting valve to be closed.
2. The automatic water cutting machine based on the rotation method according to claim 1, wherein the rotation speed detection device is connected with an output shaft of the motor through a coupling.
3. The automatic water cutting machine based on the rotation method according to claim 1, wherein the rotation speed detection device is a rotation speed sensor.
4. The automatic water cutting machine based on the rotation method according to claim 1, wherein the rotation speed detecting device is an encoder.
5. The rotary-based automatic water cutter according to claim 1, wherein the rotor is a metal rotor.
6. The rotary method-based automatic water cutting machine according to claim 1, wherein the water cutting controller is connected with the sampling pump.
7. The automatic water cutting machine based on the rotation method according to claim 1, wherein a motion mechanical seal is further arranged on an output shaft of the motor.
8. The rotary-method-based automatic water cutting machine according to claim 7, wherein the motion mechanical seal is made of rubber.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910349122.4A CN110201423B (en) | 2019-04-28 | 2019-04-28 | Automatic water cutting device based on rotation method |
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| CN201910349122.4A CN110201423B (en) | 2019-04-28 | 2019-04-28 | Automatic water cutting device based on rotation method |
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| CN110201423B true CN110201423B (en) | 2024-05-03 |
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