Optimization method of input conditions of intersection piping system based on three-way regulating valve

Abstract

The present invention discloses an optimization method for the input conditions of a confluence type pipeline system based on a three-way regulating valve, comprising the following steps: establishing a three-dimensional model according to a two-dimensional engineering drawing of the three-way regulating valve, and extracting a flow channel model; using fluid analysis software to calculate a grid model and a response surface analysis method, calculating the distribution of the three-way regulating valve inlet flow Qi under different combinations of flow, pressure, and opening, and establishing a flow distribution characteristic matrix; according to the actual process pipeline wiring situation, measuring or calculating the three-way regulating valve inlet pressure and flow value under the displacement of the adjusting screw of each upstream pressure reducing valve, and drawing the pressure reducing valve response inlet boundary condition curve; according to the flow regulation interval requirements, according to the design method proposed by the invention, selecting the optimal adjustment screw displacement, the flow regulation performance of the overall pipeline has been achieved. The present invention can set the confluence type pipeline based on the three-way regulating valve in the theoretical optimal regulation domain, avoid repeated adjustment, and reduce operation and maintenance costs.

Description

Technical Field

[0001] The invention belongs to the field of industrial valve design, and in particular relates to a method for optimizing input conditions of a junction type pipeline system based on a three-way regulating valve. Background Art

[0002] In the process pipeline systems in the fields of nuclear power, petroleum, chemical industry, etc., it is often necessary to merge the media of two pipelines and control the distribution ratio of pipeline flow. In some special occasions, high precision and high adjustment performance are required, such as the boric acid concentration chemical volume control system in the third-generation nuclear power. At this time, a three-way regulating valve is often installed at the intersection of the two pipelines to achieve the effect of efficiently controlling the distribution ratio of pipeline flow. However, during the actual operation of the system, due to the large volume of the pipeline network, the complexity of the adjustable components, and the high system redundancy, the following problems often occur: the three-way regulating valve has a small effective adjustment range and low adjustment linearity. Since this problem seriously affects the overall performance of the pipeline system, workers are required to continuously monitor and adjust during operation, which greatly reduces the operating efficiency of the system and wastes manpower and material resources. Summary of the invention

[0003] The purpose of the present invention is to overcome the defects in the prior art and provide a method for optimizing the input conditions of a junction type pipeline system based on a three-way regulating valve.

[0004] The specific technical solutions adopted by the present invention are as follows:

[0005] The present invention provides a method for optimizing the input conditions of a junction type pipeline system based on a three-way regulating valve, which is as follows:

[0006] S1. Establish a three-dimensional model of a three-way regulating valve at the intersection of pipelines according to the engineering drawings, extract the flow channel model inside the valve according to the internal flow channel of the three-dimensional model; discretize the flow channel model inside the valve into a grid model using grid division software;

[0007] S2, based on the discretized grid model in S1, according to the response surface analysis method, the inlet pressure difference Δp, the outlet flow rate Q O , valve core displacement L x As the independent variable, the inlet flow rate Q i is the array data of the dependent variable;

[0008] S3, import the array data obtained by response surface analysis in S2 into data analysis software, taking the inlet pressure difference Δp as the x-axis and the outlet flow rate Q as the O is the y-axis, with the valve core displacement L x is the z-axis, using the inlet flow rate Q i The whole space is assigned a value and the space is used as a characteristic dot matrix of a three-way regulating valve; in the characteristic dot matrix of the three-way regulating valve, the inlet flow Q iThe area where a certain value of the array is always 0 is used as the invalid adjustment domain V i , the three-way regulating valve characteristic dot matrix that does not belong to the invalid regulating domain V i The region serves as the effective regulatory domain V e , invalid regulation domain V i and effective regulatory domain V e The interface is taken as the failure surface S i ;

[0009] S4. According to the requirements of the pressure reducing valve adjustment design accuracy, select the pressure reducing valve adjusting screw displacement test interval to obtain the three-way regulating valve inlet pressure difference Δp and outlet flow rate Q under different pressure reducing valve adjusting screw displacements. O The relationship curve L p ;

[0010] S5, compare the characteristic dot matrix of the three-way regulating valve obtained in S3 with the relationship curve L obtained in S4 p Place them in the same space, observe the data characteristics, and choose to execute S61 or S62;

[0011] S61, if the relationship curve L under the displacement of all pressure reducing valve adjusting screws p The upper space contains the invalid regulation domain V i , it means that no matter how the pressure reducing valve adjusting screw is adjusted, the flow regulation performance of the overall intersection piping system cannot reach the ideal state, and the optimization operation is terminated;

[0012] S62, if there is a relationship curve L under the displacement of the pressure reducing valve adjusting screw p The upper space only contains the effective regulation domain V e , it means that this set of relationship curves can make the flow regulation performance of the overall intersection type pipeline system reach an ideal state. On this basis, S7 can be executed to select the optimal solution in this set of relationship curves;

[0013] S7. According to the weight expression in The relationship curve L p Distance to failure surface S i The average distance, X min The relationship curve L p Distance to failure surface S i The minimum distance of the curve L p The acceptable weight of the ideal relationship curve obtained in S62 is compared with the relationship curve with the largest weight;

[0014] S8, based on the relationship curve L with the largest weight obtained in S7 p, the displacement value of the pressure reducing valve adjusting screw for setting the relationship curve is obtained, and the displacement of the upstream pressure reducing valve adjusting screw in the intersection type pipeline system is set to this value, that is, the optimal flow regulation performance that can be achieved in the current intersection type pipeline system is obtained.

[0015] Preferably, the specific operation of S2 is as follows:

[0016] According to the actual working conditions of the three-way regulating valve, the pressure difference range of the two inlets of the three-way regulating valve is determined; according to the flow range required by the intersection type pipeline system, the flow range of the outlet of the three-way regulating valve is determined; according to the design drawings, the valve core displacement L of the three-way regulating valve is determined. x According to the accuracy requirements of the adjustment, in the pressure difference range, flow range and valve core displacement L x The points in the interval are taken as the independent variables of the response surface analysis method; the discretized grid model in S1 is imported into the fluid analysis software, and the fluid properties of the medium in the valve are assigned to the entire space inside the flow channel model in the valve according to the design drawings. According to the response surface analysis method, the inlet pressure difference Δp condition and the outlet flow rate Q are calculated. O Conditions, valve core displacement L x The flow value of the two inlets of the three-way regulating valve under the condition of i The value is used as the dependent variable, and the inlet pressure difference Δp and the outlet flow rate Q are derived. O , valve core displacement L x As the independent variable, the inlet flow rate Q i Array data for the dependent variable.

[0017] Preferably, in S4, if a pressure gauge and a flow meter are installed at the inlet of the three-way regulating valve, the instrument readings are directly read and the relationship curve L under different displacements of the pressure reducing valve adjusting screw is plotted. p If there is no pressure gauge or flow meter installed at the inlet of the three-way regulating valve, the relationship curve L under different displacements of the regulating screw of the pressure reducing valve can be obtained by deriving the upstream instrument reading and the Bernoulli equation. p .

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The present invention, with the help of an electronic computer, can achieve the optimal regulation performance of the current system by adjusting the displacement of the regulating screw of the upstream pressure reducing valve through numerical simulation and data analysis. The method can avoid repeated manual adjustment and reduce operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the invalid regulating region, the effective regulating region and the failure surface of the three-way regulating valve in Example 1;

[0021] Figure 2 is a curve showing the relationship between the inlet pressure difference and the outlet flow rate of the three-way regulating valve under a certain adjustment screw displacement in Example 1;

[0022] Figure 3 Schematic diagram of the distance between the relationship curve and the failure surface in Example 1. DETAILED DESCRIPTION

[0023] To make it easier to understand, the entire optimization process will be described in detail below in combination with valve disc optimization examples and simulation diagrams. Obviously, the following optimization example is only one of the optimization methods based on the content disclosed by the present invention. Before technical workers in other valve fields produce innovative results, all optimization solutions implemented based on the present invention fall within the protection scope of the present invention.

[0024] The present invention provides an optimization method for the input conditions of an intersection-type pipeline system based on a three-way regulating valve, and the method mainly comprises the following steps: establishing a three-dimensional model according to a two-dimensional engineering drawing of the three-way regulating valve, and extracting a flow channel model; using fluid analysis software to calculate a grid model and a response surface analysis method, calculating the distribution of the three-way regulating valve inlet flow Qi under different combinations of flow rates, pressures, and openings, and establishing a flow distribution characteristic matrix; measuring or calculating the inlet pressure and flow value of the three-way regulating valve under the displacement of the adjusting screw of each upstream pressure reducing valve according to the actual process pipeline wiring situation, and drawing a pressure reducing valve response inlet boundary condition curve; according to the flow regulation range requirements, selecting the optimal adjusting screw displacement according to the design method proposed by the invention, and achieving the optimal flow regulation performance of the overall pipeline.

[0025] The following is a detailed description of each step of the optimization method of the present invention.

[0026] S1. Establish a three-dimensional model of the three-way valve at the intersection of pipelines according to the engineering drawings. Extract the flow channel model inside the valve according to the internal flow channel of the three-dimensional model; and use meshing software to discretize the flow channel model inside the valve into a suitable mesh model.

[0027] S2, based on the discretized grid model in S1 above, according to the response surface analysis method, the inlet pressure difference Δp, outlet flow rate Q O , valve core displacement L x As the independent variable, the inlet flow rate Q i Array data for the dependent variable.

[0028] In actual application, the steps are as follows:

[0029] According to the actual working conditions of the three-way regulating valve, determine the pressure difference range of the two inlets of the three-way regulating valve; according to the flow range required by the intersection type pipeline system, determine the flow range of the three-way regulating valve outlet; according to the design drawings of the three-way regulating valve, determine the valve core displacement L of the three-way regulating valve.x According to the accuracy requirements of the adjustment, in the above pressure difference range, flow range, valve core displacement L x The interval is selected at appropriate positions and intervals as independent variables of the response surface analysis method. The discrete grid model obtained in S1 is imported into the fluid analysis software. According to the design drawings of the three-way control valve, the fluid properties of the medium in the valve are assigned to the entire space inside the flow channel model in the valve. According to the response surface analysis method, the inlet pressure difference Δp and the outlet flow rate Q are calculated. O Conditions, valve core displacement L x The flow value of the two inlets of the three-way regulating valve under the condition of i The value is used as the dependent variable, and the inlet pressure difference Δp and the outlet flow rate Q are derived. O , valve core displacement L x As the independent variable, the inlet flow rate Q i is the array data of the dependent variable. At this point, the response surface analysis method ends.

[0030] In this step, it is proposed to use the response surface analysis method as a method for establishing a characteristic data model of a three-way regulating valve, which can greatly reduce the amount of calculation and ensure the accuracy of the data model.

[0031] S3, import the array data obtained by response surface analysis in S2 into data analysis software, with the inlet pressure difference Δp as the x-axis and the outlet flow rate Q as the O is the y-axis, with the valve core displacement L x is the z-axis, using the inlet flow rate Q i The whole space is assigned a value and is called the three-way control valve characteristic dot matrix. In the three-way control valve characteristic dot matrix, there is an area with an inlet flow rate Q i A certain value in the array is always 0, and this area is named the invalid adjustment area V i , the three-way control valve characteristic dot matrix does not belong to the invalid regulation domain V i The region is named as the effective regulatory domain V e . Invalid regulation domain V i and effective regulatory domain V e The interface is named failure surface S i .

[0032] In this step, a characteristic dot matrix of the three-way regulating valve is proposed, and based on this, a failure regulation domain, an effective regulation domain and a failure surface of the three-way regulating valve are proposed.

[0033] S4. According to the requirements of the pressure reducing valve adjustment design accuracy, select a reasonable pressure reducing valve adjustment screw displacement test interval, and then obtain the three-way regulating valve inlet pressure difference Δp and outlet flow rate Q under different pressure reducing valve adjustment screw displacements. O The relationship curve L p .

[0034] In practical application, the relationship curve L p Obtained by the following method:

[0035] If a pressure gauge and flow meter are installed at the inlet of the three-way regulating valve, read the instrument readings directly and plot the inlet pressure difference Δp and outlet flow rate Q of the three-way regulating valve under different displacements of the pressure reducing valve adjusting screw. O The relationship curve L p If there is no pressure gauge or flow meter installed at the inlet of the three-way regulating valve, the pressure difference Δ at the inlet of the three-way regulating valve under different displacements of the regulating screw of the pressure reducing valve can be obtained according to the reading of the upstream instrument and the Bernoulli equation. p and the outlet flow Q O The relationship curve L p .

[0036] In this step, the relationship curve between the inlet pressure difference and the outlet flow rate of the three-way regulating valve under different displacements of the pressure reducing valve adjusting screw is used to analyze the influence of the displacement of the pressure reducing valve adjusting screw on the boundary conditions of the three-way regulating valve.

[0037] S5, compare the characteristic dot matrix of the three-way regulating valve obtained in S3 with the inlet pressure difference Δp and outlet flow rate Q of the three-way regulating valve obtained in S4. O The relationship curve L p Place them in the same space, observe the data characteristics, and choose to execute the following S61 or S62.

[0038] S61, according to the above S5, if the inlet pressure difference Δp and outlet flow rate Q of the three-way regulating valve under the displacement of all pressure reducing valve adjusting screws O The relationship curve L p The upper space contains the invalid regulation domain V i , it means that no matter how the pressure reducing valve adjusting screw is adjusted, the flow regulation performance of the overall system cannot reach the ideal level. At this time, the optimization operation should be ended.

[0039] S62, according to the above S5, if there is a three-way regulating valve inlet pressure difference Δp and outlet flow rate Q under the displacement of the pressure reducing valve adjusting screw O The relationship curve L p The upper space only contains the effective regulation domain V e , it means that this set of curves can make the flow regulation performance of the overall system reach an ideal level. On this basis, S7 can be executed to select the optimal solution from this set of curves.

[0040] S7. According to the weight expression in is the inlet pressure difference Δp and outlet flow rate Q of the three-way regulating valve O The relationship curve L p Distance to failure surface Si The average distance, X min is the inlet pressure difference Δp and outlet flow rate Q of the three-way regulating valve O The relationship curve L p Distance to failure surface S i Compare the ideal curves obtained in S62 with the curve with the largest weight.

[0041] S8, based on the relationship curve L with the largest weight obtained in S7 p , the displacement value of the pressure reducing valve adjusting screw for setting the curve is obtained, and the displacement of the upstream pressure reducing valve adjusting screw in the pipeline system is set to this value, so as to obtain the optimal flow regulation performance achievable in the current regulation system.

[0042] In steps S5-S8, combined with the numerical calculation method, the optimal flow regulation performance achievable in the current system can be achieved by simply adjusting the pressure reducing valve adjusting screw.

[0043] The optimization method and effects of the present invention will be specifically described below through examples.

[0044] Example 1

[0045] By observing the wiring diagram of the pipeline system, it is found that the system is an intersection type pipeline system where two routes converge into one route, and the intersection is connected by a three-way regulating valve, which meets the application scope of the optimization method of the present invention. A three-way valve three-dimensional model is established according to the engineering drawings. The flow channel model inside the valve is extracted according to the internal flow channel of the three-dimensional model; the flow channel model inside the valve is discretized into a suitable grid model using meshing software.

[0046] According to the actual working conditions of the three-way regulating valve, determine the pressure difference range of the two inlets of the three-way regulating valve; according to the flow range required by the system, determine the flow range of the three-way regulating valve outlet; according to the design drawings of the valve, determine the valve core displacement L of the three-way regulating valve. x According to the accuracy requirements of the adjustment, in the above pressure difference range, flow range, valve core displacement L x The interval is selected at appropriate positions and intervals as independent variables of the response surface method. The obtained discrete grid model is imported into the fluid analysis software. According to the valve design drawings, the fluid properties of the medium in the valve are assigned to the entire space inside the valve flow channel model. According to the response surface analysis method, the inlet pressure difference Δp condition and the outlet flow rate Q are calculated. O Conditions, valve core displacement L x The flow value of the two inlets of the three-way regulating valve under the condition of i The value is used as the dependent variable, and the inlet pressure difference Δp and the outlet flow rate Q are derived. O , valve core displacement L x As the independent variable, the inlet flow rate Q i Array data for the dependent variable.

[0047] The array data obtained by response surface analysis was imported into the data analysis software, with the inlet pressure difference Δp as the x-axis and the outlet flow rate Q as the O is the y-axis, with the valve core displacement L x is the z-axis, using the inlet flow rate Q i The whole space is assigned a value and is called the three-way control valve characteristic dot matrix. In the three-way control valve characteristic dot matrix, there is an area with an inlet flow rate Q i A certain value in the array is always 0, and this area is named the invalid adjustment area V i ,like Figure 1 As shown, the three-way control valve characteristic dot matrix that does not belong to the invalid regulation domain V i The region is named as the effective regulatory domain V e ,like Figure 1 Invalid regulatory domain V i and effective regulatory domain V e The interface is named failure surface S i ,like Figure 1 shown.

[0048] According to the requirements of the pressure reducing valve adjustment design accuracy, select a reasonable pressure reducing valve adjustment screw displacement test interval. If a pressure gauge and flow meter are installed at the inlet of the three-way regulating valve, the instrument readings are directly read to plot the three-way regulating valve inlet pressure difference Δp and outlet flow rate Q under different pressure reducing valve adjustment screw displacements. O Relationship curve L p .like Figure 2 Shown is one of the relationship curves L p，N , the relationship curve L p，N The pressure reducing valve adjusting screw displacement array is (76, 66).

[0049] In this embodiment, there is a relationship curve L under the displacement of the pressure reducing valve adjusting screw p The upper space only contains the effective regulation domain V e , relationship curve L p，N is one of the curves. Calculate the weight like Figure 3 The distance diagram of the relationship curve and the failure surface is shown in Figure 2. The curve with the largest weight among the ideal curves is curve L. p，N The displacement value of the pressure reducing valve adjusting screw for setting the curve is obtained to be (76, 66). By setting the displacement of the upstream pressure reducing valve adjusting screw in the pipeline system to this value, the optimal flow regulation performance achievable in the current regulation system can be obtained.

[0050] During the operation of the intersection pipeline, it often happens that the three-way valve has low adjustment linearity, a small effective adjustment range, or cannot be adjusted under certain working conditions. At this time, it is necessary to repeatedly change the displacement of the pressure reducing valve adjustment screw, which wastes manpower. According to the method of the present invention, the intersection pipeline based on the three-way regulating valve can be set in the theoretical optimal adjustment range, avoiding repeated adjustment and reducing operation and maintenance costs.

[0051] The above-described embodiment is only a preferred solution of the present invention, but it is not intended to limit the present invention. A person skilled in the relevant technical field may make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, any technical solution obtained by equivalent replacement or equivalent transformation falls within the protection scope of the present invention.

Claims

1. A method for optimizing the input conditions of a junction type pipeline system based on a three-way regulating valve, characterized in that: The details are as follows: S1. Establish a three-dimensional model of the three-way regulating valve at the intersection of pipelines according to the engineering drawings, extract the flow channel model inside the valve according to the internal flow channel of the three-dimensional model; discretize the flow channel model inside the valve into a grid model using grid division software; S2, based on the discretized grid model in S1, according to the response surface analysis method, the inlet pressure difference Δp, the outlet flow rate Q O , valve core displacement L x As the independent variable, the inlet flow rate Q i is the array data of the dependent variable; S3, import the array data obtained by response surface analysis in S2 into data analysis software, taking the inlet pressure difference Δp as the x-axis and the outlet flow rate Q as the O is the y-axis, with the valve core displacement L x is the z-axis, using the inlet flow rate Q i The whole space is assigned a value and the space is used as a characteristic dot matrix of a three-way regulating valve; in the characteristic dot matrix of the three-way regulating valve, the inlet flow Q i The area where a certain value of the array is always 0 is used as the invalid adjustment domain V i , the three-way regulating valve characteristic dot matrix that does not belong to the invalid regulating domain V i The region serves as the effective regulatory domain V e , invalid regulation domain V i and effective regulatory domain V e The interface is taken as the failure surface S i ; S4. According to the requirements of the pressure reducing valve adjustment design accuracy, select the pressure reducing valve adjusting screw displacement test interval to obtain the three-way regulating valve inlet pressure difference Δp and outlet flow rate Q under different pressure reducing valve adjusting screw displacements. O The relationship curve L p ; S5, compare the characteristic dot matrix of the three-way regulating valve obtained in S3 with the relationship curve L obtained in S4 p Place them in the same space, observe the data characteristics, and choose to execute S61 or S62; S61, if the relationship curve L under the displacement of all pressure reducing valve adjusting screws p The upper space contains the invalid regulation domain V i , it means that no matter how the pressure reducing valve adjusting screw is adjusted, the flow regulation performance of the overall intersection piping system cannot reach the ideal state, and the optimization operation is terminated; S62, if there is a relationship curve L under the displacement of the pressure reducing valve adjusting screw p The upper space only contains the effective regulation domain V e , it means that this set of relationship curves can make the flow regulation performance of the overall intersection type pipeline system reach an ideal state. On this basis, S7 can be executed to select the optimal solution in this set of relationship curves; S7. According to the weight expression in The relationship curve L p Distance to failure surface S i The average distance, X min The relationship curve L p Distance to failure surface S i The minimum distance of curve L p The acceptable weight of the ideal relationship curve obtained in S62 is compared with the relationship curve with the largest weight; S8, based on the relationship curve L with the largest weight obtained in S7 p , the displacement value of the pressure reducing valve adjusting screw for setting the relationship curve is obtained, and the displacement of the upstream pressure reducing valve adjusting screw in the intersection type pipeline system is set to this value, that is, the optimal flow regulation performance that can be achieved in the current intersection type pipeline system is obtained.

2. The method for optimizing the input conditions of a converging pipeline system based on a three-way regulating valve according to claim 1, characterized in that: The specific operation of S2 is as follows: According to the actual working conditions of the three-way regulating valve, the pressure difference range of the two inlets of the three-way regulating valve is determined; according to the flow range required by the intersection type pipeline system, the flow range of the outlet of the three-way regulating valve is determined; according to the design drawings, the valve core displacement L of the three-way regulating valve is determined. x According to the accuracy requirements of the adjustment, in the pressure difference range, flow range and valve core displacement L x The points in the interval are taken as the independent variables of the response surface analysis method; the discretized grid model in S1 is imported into the fluid analysis software, and the fluid properties of the medium in the valve are assigned to the entire space inside the flow channel model in the valve according to the design drawings. According to the response surface analysis method, the inlet pressure difference Δp condition and the outlet flow rate Q are calculated. O Conditions, valve core displacement L x The flow value of the two inlets of the three-way regulating valve under the condition of i The value is used as the dependent variable, and the inlet pressure difference Δp and the outlet flow rate Q are derived. O , valve core displacement L x As the independent variable, the inlet flow rate Q i Array data for the dependent variable.

3. The method for optimizing the input conditions of a junction type pipeline system based on a three-way regulating valve according to claim 1, characterized in that: In S4, if a pressure gauge and a flow meter are installed at the inlet of the three-way regulating valve, the instrument readings are directly read and the relationship curve L under different displacements of the pressure reducing valve adjusting screw is plotted. p If there is no pressure gauge or flow meter installed at the inlet of the three-way regulating valve, the relationship curve L under different displacements of the regulating screw of the pressure reducing valve can be obtained by deriving the upstream instrument reading and the Bernoulli equation. p .

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