Remote start-stop compound system suitable for fluid transportation and control method thereof

Abstract

The invention discloses a remote start-stop compound system suitable for fluid conveying and a using method thereof. The system comprises a first process tank which is connected with first fluid conveying equipment and second fluid conveying equipment in parallel, and the first fluid conveying equipment is in pipeline connection with a second process tank through a first automatic control valve; the second fluid conveying equipment is in pipeline connection with the second process tank through a fourth self-control valve; a first pressure gauge is arranged on a pipeline for connecting the first fluid conveying equipment and the first self-control valve; and a second pressure gauge is arranged on a pipeline for connecting the second fluid conveying equipment and the fourth self-control valve. According to the invention, flow control and remote start and stop control of the fluid conveying equipment are realized, manual intervention is not needed, and adverse effects on a production device caused by equipment abnormity can be greatly reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of organosilicon monomer production, and in particular relates to a remote start-stop composite system suitable for fluid transportation and a control method thereof. Background Art

[0002] Organic silicon materials are favored by people for their unique and excellent properties such as waterproof, high and low temperature resistance, weather aging resistance, good electrical properties, and environmental friendliness. They are increasingly widely used in various fields. Among them, the production of methylchlorosilane is the technical pillar of the organic silicon industry. At present, methylchlorosilane is generally synthesized by direct method, and silicon powder and methyl chloride are reacted in the presence of copper catalyst to generate methylchlorosilane series monomers. In the industrial production of methylchlorosilane, multiple process links involve the transportation and regulation of fluids, and also involve phase transitions. Therefore, process control during the synthesis reaction is particularly important.

[0003] Chinese patent CN203449526U discloses a supercritical fluid delivery device, which consists of a gas source control device, a boost control device, a storage device and an electronic control device, wherein the entire system is controlled mainly through an integrated control panel, which can achieve stable delivery and control of supercritical fluids and greatly improve work efficiency. However, it is only applicable to special supercritical fluids, and the large impact force generated when the fluid delivery device is turned on has not been paid attention to or solved.

[0004] Chinese patent CN2562173Y discloses a fluid metering control device, including a fluid conveying part, a control part and a metering part, wherein the fluid conveying part adopts a positive displacement pump in a hydraulic transmission, the rotating shaft of the positive displacement pump is connected to a motor, and the metering part is a device for detecting the number of rotations of the positive displacement pump, and the output of the device for detecting the number of rotations is connected to the control part. However, it mainly focuses on the metering of the fluid, and does not pay attention to or solve the large impact force generated when the fluid conveying device is turned on.

[0005] In the production process of methylchlorosilane, the fluid conveying equipment will generate a large impact force when it is turned on, which will have a great negative impact on the device and pipeline, and will also affect the stability of the production process, which is easy to cause product quality problems; in addition, the degree of automation of fluid conveying is one of the key factors affecting the entire production process, because automation technology can greatly improve the continuity and stability of production, reduce human errors, reduce energy consumption, and improve economic benefits. At present, the start and stop operations of fluid conveying equipment in monomer synthesis devices require employees to operate on-site. If there is a power outage or other abnormal conditions, the backup equipment cannot be started for a short time, which will cause the entire device to have a safety risk of over-temperature and over-pressure; in addition, there is only one set of fluid conveying equipment. Once the fluid conveying equipment fails, it will cause the entire device to stop production, seriously affecting production efficiency; at the same time, even if there are multiple sets of fluid conveying equipment, the switching and pressure control between fluid conveying equipment have become the difficulties and pain points in the production process of methylchlorosilane. Therefore, it is necessary to provide a system that can realize automatic control, reduce the impact of opening the fluid conveying equipment, and take into account the monitoring of the phase transition of the fluid, and can realize the switching of the fluid conveying equipment under the premise of maintaining stable delivery. Summary of the invention

[0006] In response to the above technical problems, the present invention provides a remote start-stop composite system suitable for fluid transportation and a control method thereof, which realizes flow control and remote start and stop control of fluid transportation equipment without manual intervention, and can significantly reduce the adverse effects of equipment abnormalities on production equipment.

[0007] In order to achieve the above-mentioned purpose, the present invention provides a remote start-stop composite system suitable for fluid transportation, wherein a first process tank is connected in parallel with a first fluid transportation device and a second fluid transportation device respectively, the first fluid transportation device is connected to the pipeline of the second process tank via a first automatic control valve; the second fluid transportation device is connected to the pipeline of the second process tank via a fourth automatic control valve; a first pressure gauge is provided on the pipeline connecting the first fluid transportation device and the first automatic control valve, and a second pressure gauge is provided on the pipeline connecting the second fluid transportation device and the fourth automatic control valve.

[0008] Preferably, the first fluid conveying device is connected to the gas phase storage tank and the liquid phase storage tank pipelines respectively via a second automatic control valve.

[0009] Preferably, the second fluid conveying device is connected to the gas phase storage tank and the liquid phase storage tank pipelines respectively via a third automatic control valve.

[0010] Further preferably, flow meters are provided on the pipelines where the second automatic control valve and the third automatic control valve are located.

[0011] Preferably, the first fluid conveying device is connected to the cooling water tank pipeline via a first flow control switch; the cooling water tank is connected to the first fluid conveying device pipeline, and a second flow meter is provided on the pipeline.

[0012] Preferably, the second fluid conveying device is connected to the cooling water tank pipeline via a second flow control switch; the cooling water tank is connected to the first fluid conveying device pipeline.

[0013] Preferably, the first fluid conveying device and the second fluid conveying device are any one of a pump, a fan and a compressor.

[0014] The present invention also provides a method for using a remote start-stop composite system suitable for fluid transportation, comprising the following steps: (1) Check the power supply and switch operation of fluid conveying equipment, automatic valves, and flow control switches; (2) Turn on the flow control switch to deliver cooling water to the fluid delivery equipment, and use a second flow meter to detect the cooling water flow rate; (3) Open the automatic control valve to exhaust air, and close the automatic control valve after the flow rate detected by the first flow meter is stable; (4) Turn on the fluid conveying equipment and open the automatic control valve to full open according to the pressure gauge display.

[0015] Preferably, the change rate of the gradient opening in step (4) is 10%.

[0016] Further preferably, the gradient opening method is that when the pressure gauge data is stable, the opening of the automatic control valve is first adjusted from 0 to 10%; when the outlet flow of the fluid conveying equipment rises to a stable state, the opening of the automatic control valve is adjusted to 20%, and so on until the opening of the automatic control valve is 100%.

[0017] More preferably, the stable state is that the flow value fluctuation range is within ±10%.

[0018] More preferably, during the gradient opening process of the automatic control valve, the value displayed on the pressure gauge will drop slightly, but the drop cannot exceed 30%. If the drop exceeds 30%, the automatic control valve at the equipment outlet is closed, and step (3) is repeated before performing step (4).

[0019] Preferably, the method of use further includes a switching method, and the specific steps are as follows: when switching from the first fluid delivery device to the second fluid delivery device, slowly close the first automatic control valve and slowly open the fourth automatic control valve at the same time, and when the first automatic control valve is completely closed and the fourth automatic control valve is completely opened, the switching is completed; When switching from the second fluid delivery device to the first fluid delivery device, the operation is reversed.

[0020] Preferably, the sum of the openings of the first automatic control valve and the fourth automatic control valve is 100%. When the opening of the first automatic control valve changes by 10%, the opening of the fourth automatic control valve changes in the opposite direction by 10%.

[0021] Preferably, the second flow meter is interlocked with the first flow control switch and the second flow control switch respectively, the first flow control switch is interlocked with the first fluid conveying equipment, and the second flow control switch is interlocked with the second fluid conveying equipment; when the second flow meter detects that the flow rate of cooling water in the pipeline is lower than the normal value, the first flow control switch and the first fluid conveying equipment are interlocked and tripped, and the second flow control switch and the second fluid conveying equipment are interlocked and tripped.

[0022] Further preferably, the calculation formula of the normal value is Q = (πD 2 ) / 4·v·3600, where D is the inner diameter of the pipe in m, v is the average velocity of the fluid in m / s, and Q is the flow rate in m 3 / h.

[0023] The beneficial effects of the present invention are: 1. The process tank is connected to two sets of parallel fluid conveying equipment, which reduces the impact of fluid conveying equipment failure on the production process and improves efficiency; the fluid conveying equipment can be started and stopped remotely without manual intervention, which can further reduce the adverse effects of equipment abnormalities on the production system.

[0024] 2. An automatic valve is installed on the output pipeline of the fluid conveying equipment, which can automatically control the output flow of the fluid conveying equipment, reduce the dependence on the frequency conversion equipment, and avoid the impact of the flow rate reaching a high level instantly when the fluid conveying equipment is turned on on the device and pipeline, thereby reducing the negative impact on the device and pipeline, thereby extending the service life and reducing the frequency of maintenance; at the same time, the automatic valve improves the degree of automation of the production system, reduces the labor intensity of on-site employees, and saves labor costs.

[0025] 3. The present invention has a simple structure, a short improvement cycle for the process system, and a simple and easy-to-implement system operation logic. It can be applied to multiple fluid delivery scenarios and can monitor the phase transition of the fluid in real time. It has the advantages of wide applicability and high safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 11 is a schematic diagram of the overall structure of the present invention, in which 1 is a first process tank, 2 is a first flow control switch, 3 is a second flow control switch, 4 is a first fluid conveying device, 5 is a second fluid conveying device, 6 is a cooling water storage tank, 7 is a first automatic valve, 8 is a second automatic valve, 9 is a third automatic valve, 10 is a fourth automatic valve, 11 is a gas phase storage tank, 12 is a liquid phase storage tank, 13 is a second process tank, 14 is a first flow meter, 15 is a second flow meter, 16 is a first pressure gauge, and 17 is a second pressure gauge. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It is worth noting that the following embodiments are only preferred embodiments of the present invention and should not be understood as limiting the present invention. The protection scope of the present invention shall be based on the contents recorded in the claims. Any modification or replacement made by those skilled in the art to the technical solution of the present invention without creative work shall fall within the protection scope of the present invention.

[0028] Example 1 like Figure 1 As shown, a remote start-stop composite system suitable for fluid transportation, the first process tank 1 is connected in parallel with the pipeline inlet of the first fluid transportation equipment 4 and the second fluid transportation equipment 5 respectively, the first fluid transportation equipment 4 is connected to the pipeline of the second process tank 13 via the first automatic control valve 7, so as to control the output flow of the first fluid transportation equipment 4; the second fluid transportation equipment 5 is connected to the pipeline of the second process tank 13 via the fourth automatic control valve 10, so as to control the output flow of the second fluid transportation equipment 5, so as to avoid excessive flow when the first fluid transportation equipment 4 and the second fluid transportation equipment 5 are turned on, which will cause a large impact on the pipeline, the fluid transportation equipment and the second process tank 13, affect the service life of the equipment and maintain the stability of the production process; a first pressure gauge 16 is provided on the pipeline connecting the first fluid transportation equipment 4 and the first automatic control valve 7, and a second pressure gauge 17 is provided on the pipeline connecting the second fluid transportation equipment 5 and the fourth automatic control valve 10, and the first pressure gauge 16 and the second pressure gauge 17 are used to detect the outlet pressure of the first fluid transportation equipment 4 and the second fluid transportation equipment 5 in real time.

[0029] Preferably, the first fluid conveying equipment 4 is connected to the gas phase storage tank 11 and the liquid phase storage tank 12 pipelines respectively through the second automatic control valve 8 to discharge the residual substances in the first fluid conveying equipment 4 and the pipeline, wherein the gas enters the gas phase storage tank 11 for temporary storage and the liquid enters the liquid phase storage tank 12 for temporary storage, thereby reducing the impact on the production process.

[0030] Preferably, the second fluid delivery device 5 is connected to the gas phase storage tank 11 and the liquid phase storage tank 12 through the third automatic control valve 9 respectively.

[0031] Further preferably, the gas phase storage tank 11 is arranged at the highest point of the pipeline, and the liquid phase storage tank 12 is arranged at the lowest point of the pipeline.

[0032] Further preferably, a first flow meter 14 is provided on the pipeline where the second automatic control valve 8 and the third automatic control valve 9 are located, for detecting the phase change before the fluid conveying equipment is started and monitoring the flow rate.

[0033] Preferably, the first fluid conveying device 4 is connected to the cooling water storage tank 6 pipeline via the first flow control switch 2; the cooling water storage tank 6 is connected to the first fluid conveying device 4 pipeline to circulate cooling water for the first fluid conveying device 4 to assist in cooling; a second flow meter 15 is provided on the pipeline to monitor the flow of cooling water in the pipeline.

[0034] More preferably, the first flowmeter 14 and the second flowmeter 15 are vortex flowmeters.

[0035] Preferably, the second fluid conveying device 5 is connected to the cooling water storage tank 6 pipeline via the second flow control switch 3; the cooling water storage tank 6 is connected to the first fluid conveying device 4 pipeline to convey cooling water to the second fluid conveying device 5 to assist in cooling; at the same time, the flow rate of cooling water is also monitored by the second flow meter 15 on the pipeline.

[0036] Preferably, the first fluid conveying device 4 and the second fluid conveying device 5 are any one of a pump, a fan and a compressor.

[0037] Further preferably, the automatic valve is a pneumatic regulating ball valve or an electric regulating ball valve.

[0038] Example 2 A method for using a remote start-stop composite system suitable for fluid transportation comprises the following steps: (1) Check the power supply and switch operation of fluid conveying equipment, automatic valves, and flow control switches; (2) Turn on the first flow control switch 2 to deliver cooling water to the first fluid delivery device 4, and use the second flow meter 15 to detect the cooling water flow rate; (3) Open the second automatic control valve 8 to exhaust gas and condensate, and close the second automatic control valve 8 after the first flow meter 14 detects that the flow rate is stable; (4) Opening the first fluid conveying device 4, and gradually opening the first automatic control valve 7 to full opening according to the display of the first pressure gauge 16, thereby completing the opening of the first fluid conveying device 4; (5) When choosing to start the second fluid conveying device 5 first, first open the second flow control switch 3 to deliver cooling water to the second fluid conveying device 5, and use the second flow meter 15 to detect the cooling water flow; then open the third automatic control valve 9 to exhaust, and close the third automatic control valve 9 after the first flow meter 14 detects that the flow is stable; finally, open the second fluid conveying device 5, and slowly open the fourth automatic control valve 10 to fully open according to the display of the second pressure meter 17, thereby completing the opening of the second fluid conveying device 5.

[0039] Preferably, the gradient opening described in step (4) is that after the first fluid conveying device 4 is started and the value of the first pressure gauge 16 at the outlet of the first fluid conveying device 4 is stable, the opening of the first automatic control valve 7 is first adjusted to 10%, and the outlet flow of the first fluid conveying device 4 is observed to rise to a stable state (the value fluctuation range is within ±10%), and then the first automatic control valve 7 is adjusted to 20%, and so on until the opening of the first automatic control valve 7 reaches 100%. During the entire adjustment stage, the outlet pressure of the first fluid conveying device 4 will decrease slightly, but the decrease cannot exceed 30%. If the decrease exceeds 30%, the first automatic control valve 7 is closed, and step (3) is repeated before performing step (4).

[0040] Preferably, the second flow meter 15 is interlocked with the first flow control switch 2 and the second flow control switch 3 respectively, the first flow control switch 2 is interlocked with the first fluid delivery device 4, and the second flow control switch 3 is interlocked with the second fluid delivery device 5; when the second flow meter 15 detects that the flow rate of cooling water in the pipeline is lower than 1.5m 3 / h (the pipeline diameter is DN25), the first flow control switch 2 and the first fluid conveying device 4 are interlocked and tripped, and the second flow control switch 3 and the second fluid conveying device 5 are interlocked and tripped.

[0041] Preferably, the exhaust and condensate removal process described in step (3) involves a phase transition, wherein during exhaust, the phase transition is from gas-liquid two-phase to liquid phase; during condensate removal, the phase transition is from gas-liquid two-phase to gas phase, and the opening degree of the second automatic control valve 8 is 50%-100% during the entire period before, during and after the phase transition. During exhaust, the reading of the first flow meter 14 is monitored. When the phase state is gas-liquid two-phase, the fluctuation range of the reading of the first flow meter 14 is more than ±50%, and after the phase state changes to liquid phase, the fluctuation range of the reading of the first flow meter 14 is within ±5%. During condensate removal, the reading of the first flow meter 14 is monitored. When the phase state is gas-liquid two-phase, the fluctuation range of the reading of the first flow meter 14 is more than ±50%, and after the phase state changes to gas phase, the fluctuation range of the reading of the first flow meter 14 is within ±5%.

[0042] Further preferably, the value of the flow rate detected by the first flow meter 14 after stabilization is about 2m 3 / h.

[0043] Example 3 The switching of the first fluid delivery device 4 and the second fluid delivery device 5 is carried out in the following specific steps: When switching from the opened first fluid delivery device 4 to the closed second fluid delivery device 5, the first automatic control valve 7 is slowly closed and the fourth automatic control valve 10 is slowly opened at the same time. When the first automatic control valve 7 is completely closed and the fourth automatic control valve 10 is completely opened, the switching is completed; When switching from the opened second fluid conveying device 5 to the closed first fluid conveying device 4, the fourth automatic control valve 10 is slowly closed and the first automatic control valve 7 is slowly opened at the same time. When the fourth automatic control valve 10 is completely closed and the first automatic control valve 7 is completely opened, the switching is completed.

[0044] Preferably, the sum of the openings of the first automatic valve 7 and the fourth automatic valve 10 is 100%. When the opening of the first automatic valve decreases by 10%, the opening of the fourth automatic valve increases by 10%.

Claims

1. A remote start-stop composite system suitable for fluid transportation, characterized in that: The first process tank (1) is connected in parallel with the first fluid conveying device (4) and the second fluid conveying device (5), respectively; the first fluid conveying device (4) is connected to the pipeline of the second process tank (13) via a first automatic control valve (7); the second fluid conveying device (5) is connected to the pipeline of the second process tank (13) via a fourth automatic control valve (10); a first pressure gauge (16) is provided on the pipeline connecting the first fluid conveying device (4) and the first automatic control valve (7), and a second pressure gauge (17) is provided on the pipeline connecting the second fluid conveying device (5) and the fourth automatic control valve (10).

2. A remote start-stop composite system suitable for fluid transportation according to claim 1, characterized in that: The first fluid conveying device (4) is connected to pipelines of the gas phase storage tank (11) and the liquid phase storage tank (12) respectively via a second automatic control valve (8).

3. A remote start-stop composite system suitable for fluid transportation according to claim 1, characterized in that: The second fluid delivery device (5) is connected to the gas phase storage tank (11) and the liquid phase storage tank (12) through pipelines via the third automatic control valve (9).

4. A remote start-stop composite system suitable for fluid transportation according to claim 2 or 3, characterized in that: A flow meter (14) is provided on the pipeline where the second automatic control valve (8) and the third automatic control valve (9) are located.

5. The remote start-stop composite system for fluid transportation according to claim 1, characterized in that: The first fluid delivery device (4) is connected to a pipeline of a cooling water storage tank (6) via a first flow control switch (2); the cooling water storage tank (6) is connected to a pipeline of the first fluid delivery device (4), and a second flow meter (15) is provided on the pipeline.

6. A remote start-stop composite system suitable for fluid transportation according to claim 1, characterized in that: The second fluid conveying device (5) is connected to the cooling water storage tank (6) pipeline via the second flow control switch (3); the cooling water storage tank (6) is connected to the first fluid conveying device (4) pipeline.

7. A remote start-stop composite system suitable for fluid transportation according to any one of claims 1 to 6, characterized in that: The first fluid conveying device (4) and the second fluid conveying device (5) are any one of a pump, a fan and a compressor.

8. A method for using a remote start-stop composite system suitable for fluid transportation, characterized in that: The steps include: (1) Check the power supply and switch operation of fluid conveying equipment, automatic valves, and flow control switches; (2) turning on the flow control switch to deliver cooling water to the fluid delivery device, and using a second flow meter (15) to detect the cooling water flow rate; (3) Open the automatic control valve to exhaust air, and close the automatic control valve after the first flow meter (14) detects that the flow rate is stable; (4) Turn on the fluid conveying equipment and open the automatic control valve to full open according to the pressure gauge display.

9. The method of use according to claim 8, characterized in that: The rate of change of the gradient opening described in step (4) is 10%.

10. The method of use according to claim 8, characterized in that: The method of use also includes a switching method, the specific steps of which are as follows: when switching from the first fluid conveying device (4) to the second fluid conveying device (5), slowly closing the first automatic control valve (7) and slowly opening the fourth automatic control valve (10) at the same time, and when the first automatic control valve (7) is completely closed and the fourth automatic control valve (10) is completely opened, the switching is completed; when switching from the second fluid conveying device (5) to the first fluid conveying device, the operation is reversed; The sum of the opening degrees of the first automatic control valve (7) and the fourth automatic control valve (10) is 100%.

Images