Method for adjusting pressure in deep well pipeline and filling system

Abstract

The embodiment of the invention discloses a method for adjusting pressure in a deep well pipeline and a filling system, and relates to the technical field of filling and pipeline pressure detection, regulation and control. The method comprises the steps that in the process that a filling pump is started to fill slurry into a goaf through a main pipeline, a pressure value in a first branch pipeline is collected through a first pressure sensor in the first branch pipeline, and the pressure value in the first branch pipeline is sent to a control device; when the control device judges that the pressure value in the first branch pipeline is larger than a preset pressure limit value, a first electric high-pressure ball valve is controlled to be opened to discharge filling slurry to a first sewage discharge pool for pressure relief; and the opening degree of a first electric gate valve on the main pipeline is increased, so that the circulation sectional area is enlarged. The method is suitable for the scene of monitoring and adjusting the pressure in the deep well pipeline.

Description

Technical Field

[0001] The invention relates to the technical field of filling and pipeline pressure detection and regulation, and in particular to a deep well pipeline pressure regulation method and a filling system. Background Art

[0002] The pipeline pressure monitoring and control technology during deep well (depth > 600m) filling is the core link to ensure the safe operation of the transportation system in the fields of petroleum, natural gas, chemical industry and municipal engineering. With the complexity of industrial scenes, pipelines need to withstand challenges such as high pressure, corrosion, impurity deposition, etc. for a long time. In the scene of high viscosity or solid medium, the control accuracy is difficult to guarantee, and it is difficult to cope with sudden pressure fluctuations. If the pressure in the pipeline is not adjusted in time, it may cause abnormal pressure in the pipeline, which may cause leakage, pipe burst and even safety accidents. Summary of the invention

[0003] In view of this, the present invention provides a method for regulating the pressure in a deep well pipeline and a filling system to increase the pressure relief speed when the pressure in the pipeline is abnormal.

[0004] In a first aspect, the present invention provides a method for regulating pressure in a deep well pipeline, comprising: in the process of starting a filling pump to fill slurry into a goaf via a main pipeline, collecting the pressure value in the first branch pipeline through a first pressure sensor in the first branch pipeline, and sending the pressure value in the first branch pipeline to a control device; wherein the first branch pipeline is located on a branch of the main pipeline, is connected to the main pipeline, and a probe of the first pressure sensor is installed toward the center of the main pipeline; when the control device determines that the pressure value in the first branch pipeline is greater than a preset pressure limit value, controls the opening of a first electric high-pressure ball valve to discharge the filling slurry to a first sewage tank for pressure relief; and increases the opening of a first electric gate valve on the main pipeline to expand the flow cross-sectional area; the first sewage tank is connected to the first branch pipeline through a first sewage pipe, the first electric high-pressure ball valve is arranged in the first sewage pipe, and the first electric gate valve is arranged in the main pipeline and is located downstream of the first branch pipeline.

[0005] Optionally, more than two pressure monitoring and control nodes are deployed along the main pipeline; each pressure monitoring and control node includes a branch pipeline connected to the main pipeline, a pressure sensor arranged in the branch pipeline, a sewage pipeline, a sewage tank connected to the branch pipeline through the sewage pipeline, an electric high-pressure ball valve arranged in the sewage pipeline, and an electric gate valve arranged downstream of the branch pipeline; the first branch pipeline, the first pressure sensor, the first sewage pipeline, the first sewage tank, the first electric high-pressure ball valve and the first electric gate valve constitute a first pressure monitoring and control node; wherein, in During the process of starting the filling pump to fill the goaf with filling slurry through the main pipeline, the method also includes: receiving the pressure value uploaded by the pressure sensor of each pressure monitoring and control node through the control device; when the pressure value of the first pressure monitoring and control node is monitored to be greater than the preset pressure limit value, the adjacent pressure monitoring and control nodes are linked and controlled according to the following rules: reducing the opening of the electric gate valve of the upstream node adjacent to the first pressure monitoring and control node, and increasing the opening of the electric gate valve of the downstream node adjacent to the first pressure monitoring and control node, until the pressure value of the first pressure monitoring and control node returns to normal.

[0006] Optionally, the method further includes: detecting ambient temperature using a temperature sensor; determining a pressure impact value based on the ambient temperature, and determining an actual pressure value based on the pressure impact value and a pressure value collected by the first pressure sensor.

[0007] Optionally, the method further includes: during the pressure relief process, dynamically adjusting the displacement of the filling pump according to the attenuation rate of the pressure value, and synchronously adjusting the configuration concentration of the filling slurry; when it is monitored that the pressure value is lower than the safety threshold, controlling the closing of the first electric high-pressure ball valve to terminate the pressure relief; restoring the opening of the first electric gate valve to the initial working state, controlling the displacement of the filling pump to increase step by step to the maximum, and continuing filling.

[0008] Optionally, the method further includes: when a cleaning control signal is triggered, controlling the closing of the first electric gate valve located on the main pipeline, and simultaneously opening the first electric high-pressure ball valve, flushing the cleaning fluid into the first branch pipeline through the filling pump to flush the probe of the first pressure sensor, the wall of the first branch pipeline and the wall of the first sewage pipeline, so as to discharge the flushing waste into the first sewage tank.

[0009] Optionally, the control device adjusts the decrease in the opening of the electric gate valve of the upstream adjacent node and the increase in the opening of the electric gate valve of the downstream adjacent node according to the following method: ,in , are the flow coefficients of the electric gate valves at the upstream and downstream nodes, is the reduction in the opening of the electric gate valve at the upstream adjacent node, is the increase in the opening of the electric gate valve at the downstream adjacent node; if the overpressure ratio ΔP / P1 increases by 5%, Increase by 5%-10%, Increase by 10%-15%; where P is the real-time pressure value of the node; P1 is the preset pressure limit value; ΔP=P-P1.

[0010] Optionally, in the process in which the control device adjusts the decrease in the opening amount of the electric gate valve of the upstream adjacent node and the increase in the opening amount of the electric gate valve of the downstream adjacent node according to the above method, the method further includes: using the real-time flow Q in the main pipeline collected as a correction factor, based on the formula:

[0011] Dynamically optimize the adjustment range of the electric gate valve, where K is the pipeline resistance coefficient and D is the pipe diameter, in meters.

[0012] Optionally, when the first pressure monitoring and control node is located at the elbow section, the control device further executes: according to the bending angle θ of the elbow section and the ratio of the curvature radius R to the pipe diameter D, based on the formula: Calculate the local resistance coefficient of the elbow section, where θ≤90°; increase the opening adjustment range based on the local resistance coefficient of the elbow section to adjust the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node; when the first pressure monitoring and control node is located in the variable diameter section, the control device also executes: according to the upstream and downstream pipe diameters of the variable diameter section, according to the formula Calculate the cross-sectional area change rate, where ΔA / A is the cross-sectional area change rate, and A is the pipe diameter of the first pressure monitoring and control node. is the upstream node diameter, is the pipe diameter of the downstream node; based on the cross-sectional area change rate, when ΔA / A>10%, the trigger is based on the formula Calculate the local resistance coefficient of the variable diameter section; and if the length of the variable diameter section L < 3D, ξ increases by 30%; if L ≥ 5D, ξ decreases by 20%; increase the opening adjustment range based on the local resistance coefficient of the variable diameter section to adjust the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node; when the first pressure monitoring and control node is located in the vertical section, the control device further performs: according to the filling slurry density ρ and the vertical section height h, calculate the static pressure correction term: , where g is the acceleration due to gravity, unit , ΔP is the node pressure deviation, unit Pa; based on the static pressure correction term, the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node is adjusted to .

[0013] In a second aspect, the present invention provides a filling system for a deep well pipeline, comprising: a main pipeline, a first branch pipeline, a filling pump, a sewage tank, a control device, a first pressure sensor and a first regulating valve group assembly; the filling pump is connected to the main pipeline, and the first branch pipeline is located on a branch of the main pipeline and communicated with the main pipeline; the axis of the first branch pipeline is arranged to intersect perpendicularly with the axis of the main pipeline; the first pressure sensor is arranged at an end of the first branch pipeline away from the main pipeline, and the probe of the first pressure sensor is installed toward the center of the main pipeline; the first regulating valve group assembly comprises: a first electric high-pressure ball valve and a first electric gate valve; the first electric high-pressure ball valve is arranged on a first sewage pipe, and the first sewage pipe is arranged on an end of the first branch pipe away from the main pipe and communicated with the sewage tank; the first electric gate valve is arranged on the main pipeline, behind the intersection of the main pipeline and the first branch pipeline; the filling pump, the first pressure sensor and the first regulating valve group assembly are electrically connected to the control device.

[0014] Optionally, more than two pressure monitoring and control nodes are deployed along the main pipeline; each pressure monitoring and control node includes a branch pipeline connected to the main pipeline, a pressure sensor in the branch pipeline, a sewage pipe, a sewage tank connected to the branch pipeline through the sewage pipe, an electric high-pressure ball valve in the sewage pipe, and an electric gate valve downstream of the branch pipeline; the first branch pipeline, the first pressure sensor, the first sewage pipe, the first sewage tank, the first electric high-pressure ball valve and the first electric gate valve constitute a first pressure monitoring and control node.

[0015] The present invention provides a method for regulating the pressure in a deep well pipeline and a filling system. The method collects the pressure value in the first branch pipeline through a first pressure sensor in the first branch pipeline, and sends the pressure value in the first branch pipeline to a control device, so as to avoid direct impact of filling slurry in the main pipeline on the pressure sensor, thereby improving the accuracy and service life of the pressure sensor; when the control device determines that the pressure value in the first branch pipeline is greater than a preset pressure limit value, the control device controls the opening of the first electric high-pressure ball valve to discharge the filling slurry to the first sewage tank for pressure relief; and increases the opening of the first electric gate valve on the main pipeline to expand the flow cross-sectional area, thereby increasing the pressure relief speed when the pressure in the pipeline is abnormal, thereby avoiding pipeline leakage, pipe burst or safety accidents; and the control device performs real-time coordinated control of the pressure sensor, the electric high-pressure ball valve, the electric gate valve and the filling pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a schematic flow chart of a method for regulating pressure in a deep well pipeline according to an embodiment of the present invention;

[0018] Figure 2 This is a schematic structural diagram of a deep well pipeline filling system according to an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the first node structure of a deep well pipeline filling system according to an embodiment of the present invention;

[0020] In the figure: 1. main pipeline; 2. first branch pipeline; 3. filling pump; 4. first sewage tank; 5. control device; 6. first pressure sensor; 7. first regulating valve group assembly; 71. first electric high-pressure ball valve; 72. first electric gate valve; 8. first sewage pipeline. DETAILED DESCRIPTION

[0021] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0022] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] Embodiment 1:

[0024] Figure 1 This is a schematic diagram of a method for regulating pressure in a deep well pipeline according to the present invention. Figure 1 The present invention provides a method for regulating the pressure in a deep well pipeline, comprising:

[0025] S1. During the process of starting the filling pump to fill the goaf with slurry through the main pipeline, the pressure value in the first branch pipeline is collected by the first pressure sensor in the first branch pipeline, and the pressure value in the first branch pipeline is sent to the control device; wherein, the first branch pipeline is located on the branch of the main pipeline, connected to the main pipeline, and the probe of the first pressure sensor is installed toward the center of the main pipeline.

[0026] In this step, during the filling slurry fluid filling process into the goaf through the main pipeline, the first branch pipeline is located on the branch of the main pipeline and is connected to the main pipeline. The probe of the first pressure sensor is installed in the first branch pipeline facing the center of the main pipeline. The first pressure sensor obtains the pressure value in the first branch pipeline according to the principle of Boyle's law. The formula of Boyle's law is: p , avoiding the direct impact and wear of the pressure sensor by the high-speed flowing filling slurry in the main pipeline during the monitoring process, and improving the accuracy and service life of the pressure sensor.

[0027] S2. When the control device determines that the pressure value in the first branch pipeline is greater than the preset pressure limit value, it controls the opening of the first electric high-pressure ball valve to discharge the filling slurry to the first sewage tank for pressure relief; and increases the opening of the first electric gate valve on the main pipeline to expand the flow cross-sectional area; the first sewage tank is connected to the first branch pipeline through the first sewage pipeline, the first electric high-pressure ball valve is arranged in the first sewage pipeline, and the first electric gate valve is arranged in the main pipeline and is located downstream of the first branch pipeline.

[0028] In this step, when the control device determines that the pressure value in the first branch pipeline is greater than the preset pressure limit value, the control device controls the first electric high-pressure ball valve to be opened, so that the filling slurry is discharged from the first branch pipeline and the first sewage pipeline to the sewage pool for rapid pressure relief; at the same time, the control device controls to increase the opening of the first electric gate valve on the main pipeline, such as increasing it from 30% to 60%, so as to expand the flow cross-sectional area of ​​the main pipeline, reduce the local resistance in the main pipeline, and quickly discharge the filling slurry, reduce the pressure in the main pipeline, and increase the pressure relief speed when the pressure in the pipeline is abnormal, so as to avoid leakage, pipe burst or safety accidents; the first electric high-pressure ball valve is arranged in the first sewage pipeline. When the first electric high-pressure ball valve is opened, the filling slurry and cleaning fluid in the first branch pipeline can flow into the first sewage pool through the first sewage pipeline.

[0029] In some embodiments, more than two pressure monitoring and control nodes are deployed along the main pipeline; each pressure monitoring and control node includes a branch pipeline connected to the main pipeline, a pressure sensor arranged in the branch pipeline, a sewage pipeline, a sewage tank connected to the branch pipeline through the sewage pipeline, an electric high-pressure ball valve arranged in the sewage pipeline, and an electric gate valve arranged downstream of the branch pipeline; the first branch pipeline, the first pressure sensor, the first sewage pipeline, the first sewage tank, the first electric high-pressure ball valve and the first electric gate valve constitute a first pressure monitoring and control node; wherein, in the process of starting the filling pump to fill the goaf with slurry via the main pipeline, the method further includes: receiving the pressure value uploaded by the pressure sensor of each pressure monitoring and control node through the control device; when the pressure value of the first pressure monitoring and control node is monitored to be greater than the preset pressure limit value, the adjacent pressure monitoring and control nodes are controlled in linkage according to the following rules: reducing the opening of the electric gate valve of the upstream node adjacent to the first pressure monitoring and control node, and increasing the opening of the electric gate valve of the downstream node adjacent to the first pressure monitoring and control node, until the pressure value of the first pressure monitoring and control node returns to normal.

[0030] In this step, the pressure sensors of each node can be connected to the control device and the cloud platform respectively through the network to achieve global pressure balance optimization, and the pressure distribution monitoring of the entire pipeline section can be realized through the networking of pressure sensors of multiple nodes. When any node is over-pressured, the opening of the electric gate valves of the upstream node and the downstream node can be coordinated to improve the response speed and pressure relief speed to the sudden pressure situation; in the process of starting the filling pump to fill the goaf with slurry through the main pipeline, the method can also include: receiving the pressure value in the branch pipeline of each node collected and uploaded by each pressure sensor in real time through the control device, calculating the actual pressure value in the branch pipeline of each node, and the control device recording the real-time pressure value, analyzing the historical pressure curve through the algorithm, Predict the risk of pipe blockage and start the pressure relief operation in advance; when the actual pressure value of any node is monitored to be greater than the preset pressure limit value, the adjacent pressure monitoring and control nodes are controlled in conjunction according to the following rules: reduce the opening of the electric gate valve of the upstream node adjacent to the first node, increase the opening of the electric gate valve of the downstream node adjacent to the first node, reduce the resistance of the downstream pipeline node, and achieve coordinated joint adjustment until the pressure value of the first node returns to normal. After troubleshooting, gradually restore the opening of the electric high-pressure ball valve and electric gate valve of the upstream and downstream adjacent nodes of the first node to resume the normal filling process; distributed deployment of pressure sensors supports global pressure optimization of complex pipelines, especially suitable for long-distance and multi-branch filling scenarios.

[0031] In some embodiments, the method may further include: detecting the ambient temperature using a temperature sensor; determining a pressure impact value based on the ambient temperature, and determining an actual pressure value based on the pressure impact value and a pressure value collected by the first pressure sensor.

[0032] In this step, temperature will cause thermal expansion effect on the first branch pipeline, the first pressure sensor and the cavity between the first pressure sensor and the first branch pipeline, thereby causing errors. The temperature sensor is used to detect the ambient temperature data near the first pressure sensor, and the temperature data is sent to the control device. The control device determines the pressure impact value of the temperature on the pressure sensor based on the ambient temperature data, and calculates the actual pressure value in the first branch pipeline according to the piecewise linear fitting algorithm, the pressure impact value and the pressure value collected by the first pressure sensor, thereby improving the accuracy of the pressure value collected by the pressure sensor.

[0033] In some embodiments, the method may further include: during the pressure relief process, dynamically adjusting the displacement of the filling pump according to the pressure value attenuation rate, and synchronously adjusting the configuration concentration of the filling slurry; when the monitored pressure value is lower than the safety threshold, controlling the closing of the first electric high-pressure ball valve to terminate the pressure relief; restoring the opening of the first electric gate valve to the initial working state, controlling the filling pump displacement to increase step by step to the maximum, and continuing filling.

[0034] In this step, during the pressure relief process, the displacement of the filling pump is dynamically adjusted according to the pressure value decay rate, such as from 100% to 70%, to reduce the flow rate of the filling slurry input into the main pipeline, and the concentration of the filling slurry is simultaneously adjusted and optimized, such as the water-cement ratio is reduced by 15%, the viscosity of the filling slurry is reduced, the fluid resistance is further reduced, the flow rate of the filling slurry is increased, blockage in the pipeline is avoided, the stability of pressure regulation in the pipeline is improved, and damage to the pipeline, sensor, electric high-pressure ball valve and electric gate valve caused by the water hammer effect due to excessive pressure change rate in the pipeline is avoided, and the pressure relief stability when the pressure in the pipeline is abnormal is improved.

[0035] When the pressure value drops below the safety threshold, the control device controls the closing of the first electric high-pressure ball valve to terminate the pressure relief operation.

[0036] After the pressure relief is terminated, the opening of the first electric gate valve is restored to the initial working state in a step-by-step manner, such as from 60% to 30%, and the displacement of the filling pump is controlled to increase step-by-step to the maximum, such as from 75%→85%→100%, to ensure that the pressure in the main pipeline and the first branch pipeline smoothly transitions to the normal operating range to continue the filling process, avoiding sudden changes in pressure in the pipeline from causing damage to the pipeline and the devices in the pipeline.

[0037] In some embodiments, the method further includes: when a cleaning control signal is triggered, controlling the closing of a first electric gate valve located on the main pipeline, and simultaneously opening a first electric high-pressure ball valve, flushing the cleaning fluid into the first branch pipeline through a filling pump to flush the probe of the first pressure sensor, the wall of the first branch pipeline, and the wall of the first sewage pipeline, so as to discharge the flushing waste into the first sewage tank.

[0038] In this step, when it is necessary to clean the first pressure sensor and the first branch pipe, the cleaning control signal is triggered, and the control device controls the closing of the first electric gate valve located in the main pipe to block the downward flow of the cleaning fluid in the main pipe, and switches the cleaning fluid to the first sewage pipe. At the same time, the first electric high-pressure ball valve located on the first sewage pipe is fully opened, and the filling pump is only connected to the cleaning fluid source. The filling pump is started to output the cleaning fluid (pressure ≥3MPa) into the main pipe, and the cleaning fluid is flushed into the first branch pipe and the first sewage pipe, and the first branch pipe wall, the first pressure sensor, the first sewage pipe wall and the valve cavity of the first electric high-pressure ball valve are flushed to remove the gas adhering to the pressure sensor probe, the first branch pipe wall, the first sewage pipe wall and the first sewage pipe wall. The sediment on the sewage pipe wall and the valve cavity of the first electric high-pressure ball valve is discharged to the first sewage tank; after flushing, the first sewage tank collects and discharges the waste liquid into the underground drainage ditch; after cleaning, the control device verifies the accuracy and signal stability of the first pressure sensor and the temperature sensor. If the verification is abnormal, it triggers secondary cleaning or alarms to remind the staff to handle it; the pipe walls of the main pipeline, the first branch pipeline and the first sewage pipe and the pressure sensors and valve cavities therein can be cleaned without stopping the machine, and there is no need to clean the pressure sensors in the pipeline separately, avoiding operation interruptions caused by shutdowns for clearing blockages in traditional solutions and reducing economic losses. For example, in the coal mine grouting scenario, the traditional shutdown for clearing blockages loses more than 100,000 yuan per hour.

[0039] In some embodiments, the control device adjusts the decrease in the opening of the electric gate valve of the upstream adjacent node and the increase in the opening of the electric gate valve of the downstream adjacent node according to the following method: ,in , are the flow coefficients of the electric gate valves at the upstream and downstream nodes, is the reduction in the opening of the electric gate valve at the upstream adjacent node, is the increase in the opening of the electric gate valve at the downstream adjacent node; if the overpressure ratio ΔP / P1 increases by 5%, Increase by 5%-10%, Increase by 10%-15%; where P is the real-time pressure value of the node; P1 is the preset pressure limit value; ΔP=P-P1.

[0040] In this step, the reduction in the opening of the electric gate valve of the upstream adjacent node and the increase in the opening of the electric gate valve of the downstream adjacent node are adjusted to satisfy the resistance balance equation: , in order to maintain the stability of the total flow in the main pipeline; when the real-time pressure value of the first node exceeds the preset pressure limit value, the control device sets the electric regulating valve opening adjustment gradient according to the node overpressure ratio ΔP / P1 to avoid damage to the pipeline caused by sudden pressure changes in the pipeline. For example, when the overpressure ratio ΔP / P1 increases by 5%, Increase by 5%-10%, Increased by 10%-15%.

[0041] In some embodiments, when the control device adjusts the electric gate valve opening reduction amount of the upstream adjacent node and the electric gate valve opening increase amount of the downstream adjacent node according to the above method, the method further includes: using the real-time flow Q in the main pipeline collected as a correction factor, based on the formula: opening adjustment amount Dynamically optimize the adjustment range of the electric gate valve, where K is the pipeline resistance coefficient and D is the pipe diameter, in meters.

[0042] In this step, a flow sensor is set at the front end of the intersection of the branch pipe and the main pipe in the main pipe, and the real-time flow in the main pipe is introduced as the correction factor based on the formula: The opening adjustment range of the electric gate valve is dynamically optimized according to the flow feedback, and the nonlinear relationship between the opening adjustment amount and the filling slurry flow rate is flexibly handled, so as to automatically adjust the importance weight of the correction factor under different working conditions to accurately control the opening of the electric gate valve; in view of the high solid content characteristics of the filling slurry, the electric gate valve adopts an equal percentage flow characteristic valve core to ensure that the fine-tuning accuracy of the electric gate valve at a small opening is ±1%, thereby improving the control accuracy of the electric gate valve and being able to respond quickly at a large opening, so that the opening change rate of the electric gate valve is increased by 5% / s, thereby improving the control speed of the electric gate valve.

[0043] In some embodiments, the deployment locations of more than two pressure monitoring and control nodes include: pipeline elbows, reducer sections and vertical section nodes. If the node is located at an elbow, reducer section or vertical section node, the electric gate valve opening compensation amount is adjusted according to the local resistance coefficient ξ. For example, ΔL at the elbow needs to be additionally increased by ξ×10%.

[0044] In some embodiments, when the first pressure monitoring and control node is located at the elbow section, the control device further executes: according to the bending angle θ of the elbow section and the ratio of the curvature radius R to the pipe diameter D, based on the formula: Calculate the local resistance coefficient of the elbow section, where θ≤90°; increase the opening adjustment range based on the local resistance coefficient of the elbow section to adjust the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node.

[0045] In this step, when the first node is located at the elbow section, After that, based on the local resistance coefficient of the elbow section, the electric gate valve opening adjustment amount of the upstream adjacent node and the downstream adjacent node of the first node is corrected. Specifically, the control device corrects the local resistance coefficient according to the elbow bending angle θ and the ratio R / D of the elbow curvature radius to the main pipeline diameter D; when the elbow bending angle θ increases from 0° to 90°, ξ increases nonlinearly, which is specifically expressed as follows: (applicable when θ≤90°), when θ is 45°, the local resistance coefficient caused by θ at the elbow is ; When the ratio R / D of the elbow curvature radius R and the pipe diameter D increases, ξ gradually decreases, but the rate of decrease slows down as R / D increases. The formula is: When R / D=3, ; When R / D=6, ; When R / D→∞, → 0. Comprehensive influence of bending angle and curvature radius , that is, the combined correction formula is: Improve the accuracy of the resistance compensation of the elbow section at large angles and small curvature radius; that is, the reduction in the opening of the electric gate valve of the upstream adjacent node after correction is ×10%, the increase in the opening of the electric gate valve at the downstream adjacent node is + ×10%.

[0046] In some embodiments, when the first pressure monitoring and control node is located at the variable diameter section, the control device further executes: according to the upstream and downstream pipe diameters of the variable diameter section, according to the formula Calculate the cross-sectional area change rate, where ΔA / A is the cross-sectional area change rate, and A is the pipe diameter of the first pressure monitoring and control node. is the upstream node diameter, is the pipe diameter of the downstream node; based on the cross-sectional area change rate, when ΔA / A>10%, the trigger is based on the formula Calculate the local resistance coefficient of the variable diameter section; and if the length of the variable diameter section L is less than 3D, ξ increases by 30%; if L is greater than or equal to 5D, ξ decreases by 20%; increase the opening adjustment range based on the local resistance coefficient of the variable diameter section to adjust the reduction in the opening of the electric gate valve of the upstream adjacent node or the increase in the opening of the electric gate valve of the downstream adjacent node.

[0047] In this step, when the first node is located in the variable diameter section, After that, based on the local resistance coefficient of the variable diameter section, the electric gate valve opening adjustment amount of the upstream adjacent node and the downstream adjacent node of the first node is corrected. Specifically, the control device corrects the local resistance coefficient according to the cross-sectional area change rate ΔA / A; when according to the cross-sectional area of ​​the upstream and downstream pipes of the variable diameter section, according to the calculation formula: Calculate the cross-sectional area change rate. When ΔA / A is greater than 10%, ξ increases with ΔA / A in a square order, that is, , if the cross-sectional area is reduced by 30% (ΔA / A=0.3), ξ=0.5×0.09=0.045, after adding the reference value of 0.5, the total ξ=0.545; if L≥5D (D is the main pipeline diameter), ξ can be reduced by 20%, that is, the corrected reduction in the opening of the electric gate valve at the upstream adjacent node is ×20%, the increase in the opening of the electric gate valve at the downstream adjacent node is + ×20%; if the length of the variable diameter section L<3D, ξ increases by 30%, that is, the reduction in the opening of the electric gate valve of the upstream adjacent node after correction is ×30%, the increase in the opening of the electric gate valve at the downstream adjacent node is + ×30%; ​​if the length of the variable diameter section L is outside the above range, ξ increases by 10%, that is, the corrected reduction in the opening of the electric gate valve of the upstream adjacent node is ×10%, the increase in the opening of the electric gate valve at the downstream adjacent node is + ×10%; to achieve the correction of the local resistance coefficient of the variable diameter section in the main pipeline and improve the resistance compensation accuracy of the variable diameter section.

[0048] In some embodiments, when the first pressure monitoring and control node is located in the vertical section, the control device further performs: calculating the static pressure correction term according to the filling slurry density ρ and the vertical section height h:

[0049] , where g is the acceleration due to gravity, unit , ΔP is the node pressure deviation, unit Pa; based on the static pressure correction term, the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node is adjusted to .

[0050] In this step, when the first node is located in the vertical pipeline section, the opening adjustment amount of the electric gate valve controlled by the control device also needs to be superimposed with the static pressure correction term caused by the gravity of the filling slurry. , in order to improve the accuracy of the opening adjustment of the electric gate valve.

[0051] In some embodiments, when adjusting the opening of the electric gate valve, it also includes: collecting the real-time flow of the filling slurry in the pipe section of the node where the flow sensor is located, and sending it to the control device; when the control device monitors that the sudden change of the real-time flow exceeds the safe flow threshold, adjusting the opening amplitude in advance according to the preset opening adjustment strategy; and dynamically correcting the opening control response curve according to the yield stress and viscosity μ of the filling slurry to adapt to changes in flow and pressure.

[0052] In this step, when adjusting the opening of the electric gate valve, the flow sensor data is used as the feedforward signal. When the flow rate suddenly exceeds the threshold ( ), adjust the electric gate valve opening compensation in advance, the flow rate per , corresponding to the opening of the electric gate valve .

[0053] The electric gate valve opening control response curve is dynamically corrected according to the yield stress and viscosity μ of the filling slurry. The delay time of the electric gate valve opening adjustment can be shortened to 0.5 seconds under high viscosity filling conditions. Based on the rheological properties of the filling slurry, the quantitative relationship between the electric gate valve opening adjustment amount ΔL and the yield stress τ and viscosity μ is constructed, and the electric gate valve opening correction formula is: ,in , The benchmark yield stress (100Pa) and viscosity (1Pa·s) are used, and the power index n=0.5 (applicable to shear-thinning fluids); at the same time, the viscosity-response time coupling mechanism is added, and the delay time is dynamically adjusted to meet the formula: )),in In this case , , to prevent high viscosity filling slurry from causing pipe blockage due to sudden increase in resistance; and to adopt graded compensation rules for the rheological parameters of filling slurry-electric valve linkage, among which,

[0054] First-level compensation (dominated by the yield stress of filling slurry): , adopt step-type opening adjustment, the opening change increases by 20%, and triggers the synchronous action of the valves at adjacent nodes (such as the opening of the adjacent electric gate valve upstream of the first node is -15%, and the opening of the adjacent electric gate valve downstream of the first node is +10%);

[0055] Secondary compensation (dominated by filling slurry viscosity μ): If and , gradual gradient adjustment is adopted, and the opening is adjusted by 3%-5% every 0.2 seconds to avoid pressure oscillation caused by sudden changes in viscous resistance.

[0056] In some embodiments, the main pipeline may have multiple branch pipelines. For the multiple branch pipelines, the electric gate valve opening adjustment weight of each branch is allocated by using the proportion of the cross-sectional area of ​​each branch pipeline to allocate the electric gate valve opening adjustment weight, such as the first branch pipeline accounts for 70% and the second branch pipeline accounts for 30%, to avoid single-node adjustment causing global pressure fluctuations in the pipeline.

[0057] In some embodiments, a guide plate is installed at the elbow of the main pipeline, and combined with the step-by-step adjustment of the electric gate valve opening (the change in the electric gate valve opening at each level is ≤5%), the Reynolds number is controlled in the laminar-turbulent transition zone (Re=2000~4000), thereby reducing the risk of erosion of the filling slurry at the elbow of the pipeline.

[0058] Embodiment 2:

[0059] Figure 2 FIG. 1 is a schematic diagram of a deep well pipeline filling system according to an embodiment of the present invention. Figure 2As shown, the present invention provides a filling system for deep well pipelines, including: a main pipeline 1, a first branch pipeline 2, a filling pump 3, a first sewage tank 4, a control device 5, a first pressure sensor 6 and a first regulating valve group assembly 7.

[0060] The main pipeline 1 serves as the main filling slurry conveying channel, the filling pump 3 is connected to the main pipeline 1, the first branch pipeline 2 is located on the branch of the main pipeline 1 and is connected to the main pipeline 1; the axis of the first branch pipeline 2 is arranged to intersect the axis of the main pipeline 1 perpendicularly.

[0061] The temperature sensor (not shown in the figure) is integrated on the first pressure sensor 6. The temperature sensor and the first pressure sensor 6 are both electrically connected to the control device 5. The filling pump 3 and the first regulating valve group component 7 are electrically connected to the control device 5. The control device 5 receives data from the pressure sensor 6 and the temperature sensor to accurately control the output flow of the filling pump 3, the pressure relief of the first regulating valve group component 7, the restoration of the normal filling process, and the cleaning of the branch pipelines, pressure sensors, sewage pipelines, electric high-pressure ball valves and electric gate valves at each node; the first pressure sensor 6 is arranged at the end of the first branch pipeline 2 away from the main pipeline 1, and the probe of the first pressure sensor 6 is installed in the first branch pipeline 2 toward the center of the main pipeline 1, so as to facilitate the detection of the pressure of the filling slurry flowing into the first branch pipeline 2 from the main pipeline 1; Figure 3 This is a schematic diagram of the first node structure of a deep well pipeline filling system according to an embodiment of the present invention, see Figure 3 The first branch pipeline 2 includes a first cavity and a second cavity, the inner diameter of the second cavity is smaller than the inner diameter of the first cavity, the second cavity is located above the first cavity, and the first cavity and the second cavity are connected to form an integrated structure; the volume of the second cavity of the first branch pipeline 2 is The volume of the first cavity of the first branch pipe 2 The sum of the volumes of the gases in the first cavity and the second cavity of the first branch pipe 2 is a constant value. When the filling slurry enters the first branch pipe 2 and compresses the gas in its cavity, the sum of the volumes of the gases in the first cavity and the second cavity of the first branch pipe 2 changes to ,satisfy To ensure that the first pressure sensor 6 is in a clean working environment during the filling process, To meet the ultimate pressure of the filling pipeline, avoid direct impact of the filling slurry in the main pipeline on the pressure sensor, improve the service life and measurement accuracy of the pressure sensor, prevent impact of filling slurry or cleaning fluid and other external environmental interference, and maintain the stability of pressure detection data.

[0062] The first regulating valve group component 7 includes: a first electric high-pressure ball valve 71 and a first electric gate valve 72; the first electric high-pressure ball valve 71 is arranged on the first sewage pipe 8 for rapid pressure relief, and its response time is ≤0.5 seconds. The valve core adopts tungsten carbide coating to resist the impact and wear of the high-solid content medium in the filling slurry; the first sewage pipe 8 is arranged on the first branch pipe 2 away from the end of the main pipe 1, and is connected with the first sewage tank 4, and is used to make the filling slurry flow from the first branch pipe 2 and the first sewage pipe 8 to the first sewage tank 4 when the pressure in the main pipe exceeds the limit, so as to achieve rapid pressure relief and avoid pipeline leakage, pipe burst and safety accidents caused by abnormal pressure; the first electric gate valve 72 is arranged on the main pipe 1, behind the intersection of the main pipe 1 and the first branch pipe 2, and the first electric gate valve 72 is controlled by the reducer and the motor to ensure the opening accuracy of ±1%. It supports stepped flow control, improves the pressure and filling slurry flow control stability in the main pipeline 1 and the operation stability of the filling process; the filling pump 3, the first pressure sensor 6 and the first regulating valve group component 7 are electrically connected to the control device 5, so that the control device 5 can realize real-time coordinated control of the filling pump 3 and the first regulating valve group component 7 according to the data of the first pressure sensor 6.

[0063] In some embodiments, more than two pressure monitoring and control nodes are deployed along the main pipeline; each pressure monitoring and control node includes a branch pipeline connected to the main pipeline, a pressure sensor in the branch pipeline, a sewage pipe, a sewage tank connected to the branch pipeline through the sewage pipe, an electric high-pressure ball valve in the sewage pipe, and an electric gate valve downstream of the branch pipeline; the first branch pipeline, the first pressure sensor, the first sewage pipe, the first sewage tank, the first electric high-pressure ball valve and the first electric gate valve constitute a first pressure monitoring and control node.

[0064] See also Figure 2 and Figure 3 The first node includes a first branch pipeline 2, a first pressure sensor 6, a first sewage pipeline 8, a first electric high-pressure ball valve 71, a first sewage tank 4 and a first electric gate valve 72 arranged downstream of the first branch pipeline 2. Two or more pressure detection and control nodes with the same structure as the first node are deployed along the main pipeline 1. When each node is in a pressure relief operation, the filling slurry at the first node flows along the first branch pipeline 2, through the first sewage pipeline 8 through the first electric high-pressure ball valve 71 to the first sewage tank 4; when each node is in a cleaning operation, the first electric gate valve 72 is closed at the first node to block the flow of the cleaning fluid to the downstream node. The cleaning fluid flows along the first branch pipeline 2, flushes the first pressure sensor 6 and the pipe wall of the first branch pipeline 2, and then passes through the first sewage pipeline 8 through the first electric high-pressure ball valve 71 to flush the valve cavity of the first electric high-pressure ball valve 71 and the pipe wall of the first sewage pipeline 8, and flushes the sediment attached to the first pressure sensor 6, the valve cavity and the pipeline.

[0065] In some embodiments, the first regulating valve assembly 7 further includes: elastic buckles and limit columns arranged between the valve stems and couplings of the first electric high-pressure ball valve 71 and the first electric gate valve 72 to prevent particles in the filling slurry from blocking the valves.

[0066] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. The orientation or position relationship indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present application. Moreover, the terms "include", "comprise" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or equipment including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or equipment. In the absence of more restrictions, the elements defined by the sentence "including one..." do not exclude the existence of other identical elements in the process, method, article or equipment including the elements.

[0067] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A method for regulating pressure in a deep well pipeline, characterized in that: include: When the filling pump is started to fill the goaf with slurry via the main pipeline, the pressure value in the first branch pipeline is collected by the first pressure sensor in the first branch pipeline, and the pressure value in the first branch pipeline is sent to the control device; wherein the first branch pipeline is located on the branch of the main pipeline, connected to the main pipeline, and the probe of the first pressure sensor is installed toward the center of the main pipeline; When the control device determines that the pressure value in the first branch pipeline is greater than the preset pressure limit value, it controls the opening of the first electric high-pressure ball valve to discharge the filling slurry to the first sewage tank for pressure relief; and increases the opening of the first electric gate valve on the main pipeline to expand the flow cross-sectional area; the first sewage tank is connected to the first branch pipeline through the first sewage pipe, the first electric high-pressure ball valve is arranged in the first sewage pipe, and the first electric gate valve is arranged in the main pipeline and is located downstream of the first branch pipeline.

2. The method according to claim 1, characterized in that More than two pressure monitoring and control nodes are deployed along the main pipeline; each pressure monitoring and control node includes a branch pipeline connected to the main pipeline, a pressure sensor arranged in the branch pipeline, a sewage pipeline, a sewage tank connected to the branch pipeline through the sewage pipeline, an electric high-pressure ball valve arranged in the sewage pipeline, and an electric gate valve arranged downstream of the branch pipeline; the first branch pipeline, the first pressure sensor, the first sewage pipeline, the first sewage tank, the first electric high-pressure ball valve and the first electric gate valve constitute a first pressure monitoring and control node; Wherein, in the process of starting the filling pump to fill the goaf with slurry via the main pipeline, the method further comprises: receiving, by the control device, the pressure value uploaded by the pressure sensor of each pressure monitoring and control node; When the pressure value of the first pressure monitoring and control node is greater than the preset pressure limit value, the adjacent pressure monitoring and control nodes are linked and controlled according to the following rules: Reduce the opening of the electric gate valve of the upstream node adjacent to the first pressure monitoring and control node, and increase the opening of the electric gate valve of the downstream node adjacent to the first pressure monitoring and control node until the pressure value of the first pressure monitoring and control node returns to normal.

3. The method according to claim 1, characterized in that Also includes: Use temperature sensor to detect ambient temperature; A pressure influence value is determined based on the ambient temperature, and an actual pressure value is determined based on the pressure influence value and the pressure value collected by the first pressure sensor.

4. The method according to claim 1, characterized in that Also includes: During the pressure relief process, the displacement of the filling pump is dynamically adjusted according to the pressure value decay rate, and the configuration concentration of the filling slurry is adjusted synchronously; When the pressure value is detected to be lower than a safety threshold, the first electric high-pressure ball valve is controlled to close to terminate the pressure relief; The opening of the first electric gate valve is restored to the initial working state, the displacement of the filling pump is controlled to increase step by step to the maximum, and the filling is continued.

5. The method according to claim 1, characterized in that Also includes: When the cleaning control signal is triggered, the first electric gate valve on the main pipeline is controlled to close, and the first electric high-pressure ball valve is opened at the same time. The cleaning fluid is flushed into the first branch pipeline through the filling pump to flush the probe of the first pressure sensor, the wall of the first branch pipeline and the wall of the first sewage pipeline, so as to discharge the flushing waste into the first sewage tank.

6. The method according to claim 2, characterized in that The control device adjusts the decrease in the opening of the electric gate valve of the upstream adjacent node and the increase in the opening of the electric gate valve of the downstream adjacent node according to the following method: ,in , are the flow coefficients of the electric gate valves at the upstream and downstream nodes, is the reduction in the opening of the electric gate valve at the upstream adjacent node, The increase in the opening degree of the electric gate valve at the downstream adjacent node; If the overpressure ratio Every 5% increase, Increase by 5%-10%, Increase by 10%-15%; where P is the real-time pressure value of the node, P1 is the preset pressure limit value, .

7. The method according to claim 6, characterized in that In the process in which the control device adjusts the decrease amount of the electric gate valve opening of the upstream adjacent node and the increase amount of the electric gate valve opening of the downstream adjacent node according to the above method, the method further includes: The real-time flow Q in the main pipeline is used as the correction factor, based on the formula: Dynamically optimize the adjustment range of the electric gate valve, where K is the pipeline resistance coefficient and D is the pipe diameter, in meters.

8. The method according to claim 6, characterized in that The method further comprises: When the first pressure monitoring and control node is located at the elbow section, the control device further performs: According to the bending angle θ of the elbow section and the ratio of the curvature radius R to the pipe diameter D, based on the formula: Calculate the local drag coefficient of the elbow section, where θ≤90°; Increasing the opening adjustment range based on the local resistance coefficient of the elbow section to adjust the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node; When the first pressure monitoring and control node is located at the variable diameter section, the control device further performs: According to the upstream and downstream pipe diameters of the variable diameter section, according to the formula Calculate the rate of change of cross-sectional area, where is the cross-sectional area change rate, A is the pipe diameter of the first pressure monitoring and control node, is the upstream node diameter, is the pipe diameter of the downstream node; Based on the cross-sectional area change rate, when When triggered, the formula is: Calculate the local resistance coefficient of the variable diameter section; And, if the length of the variable diameter section L < 3D, ξ increases by 30%; if L ≥ 5D, ξ decreases by 20%; Increasing the opening adjustment range based on the local resistance coefficient of the variable diameter section to adjust the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node; When the first pressure monitoring and control node is located in the vertical section, the control device further performs: According to the filling slurry density ρ and the vertical section height h, calculate the static pressure correction term: , where g is the acceleration due to gravity, unit , ΔP is the node pressure deviation, unit: Pa; Based on the static pressure correction term, the electric gate valve opening reduction amount of the upstream adjacent node or the electric gate valve opening increase amount of the downstream adjacent node is adjusted to or .

9. A filling system for deep well pipelines, characterized in that: include: A main pipeline, a first branch pipeline, a filling pump, a sewage tank, a control device, a first pressure sensor and a first regulating valve group assembly; The filling pump is connected to the main pipeline, the first branch pipeline is located on the branch of the main pipeline and is connected to the main pipeline; the axis of the first branch pipeline is arranged to intersect the axis of the main pipeline perpendicularly; The first pressure sensor is arranged at one end of the first branch pipeline away from the main pipeline, and the probe of the first pressure sensor is installed toward the center of the main pipeline; The first regulating valve assembly comprises: a first electric high-pressure ball valve and a first electric gate valve; the first electric high-pressure ball valve is arranged on a first sewage pipe, the first sewage pipe is arranged on the first branch pipe away from one end of the main pipe and is connected to the sewage tank; the first electric gate valve is arranged on the main pipe, behind the intersection of the main pipe and the first branch pipe; The charging pump, the first pressure sensor and the first regulating valve group component are electrically connected to the control device.

10. The filling system according to claim 9, characterized in that There are more than two pressure monitoring and control nodes deployed along the main pipeline; each pressure monitoring and control node includes a branch pipeline connected to the main pipeline, a pressure sensor arranged in the branch pipeline, a sewage pipeline, a sewage tank connected to the branch pipeline through the sewage pipeline, an electric high-pressure ball valve arranged in the sewage pipeline, and an electric gate valve arranged downstream of the branch pipeline; the first branch pipeline, the first pressure sensor, the first sewage pipeline, the first sewage tank, the first electric high-pressure ball valve and the first electric gate valve constitute a first pressure monitoring and control node.

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