Steam pipe network optimization regulation and control method based on valve characteristics

Abstract

The invention discloses a steam pipe network optimization regulation and control method based on valve characteristics. The method comprises the steps that 1, factory characteristic curves of all valves of a steam pipe network are corrected one by one to obtain valve characteristic curves; 2, establishing a pipe network steady-state model according to the geometric parameters, the physical property parameters and the steady-state operation data of the steam pipe network; 3, constructing a characteristic relation database of the opening degree of each valve and the hydraulic working condition of the steam pipe network; 4, when the steam consumption load of the user side is changed from the first steam consumption amount to the second steam consumption amount, the pipe network steady-state model and the valve characteristic curve serve as constraint conditions, and the opening degree of each valve corresponding to the second steam consumption amount is retrieved in the characteristic relation database; the valves are regulated and controlled according to the retrieved opening degrees of the valves; due to the fact that the number of the pipe network steady-state model and the number of the valve opening degree data matrixes are limited, the pipe network steady-state model and the valve opening degree data matrixes are coupled and enumerated to form the characteristic relation database, modeling and solving are greatly simplified, cost is reduced, and later application efficiency is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the field of valve regulation, and in particular relates to a steam pipe network optimization regulation method based on valve characteristics. Background Art

[0002] In the regulation of steam pipe network, steam traps, safety valves, relief valves, etc. are generally self-operated and do not require manual operation to operate; regulating valves are valves that balance the hydraulic conditions of the system in the steam pipe network and generally require manual operation according to the hydraulic conditions of the pipe network.

[0003] The simulation modeling of steam pipe network is divided into steady-state model and transient model according to whether the change of pipe network system over time is considered. Steady-state model is generally a set of algebraic equations, and transient model is generally a set of differential equations containing time terms. Since the steady-state model involves fewer parameters and the mathematical relationship between the parameters is expressed by simple algebraic equations, the modeling and solution methods are simple. The transient model involves more system parameters and considers the change of each parameter over time. Therefore, the transient model has high accuracy in dynamic analysis; but the cost of establishing the simulation model and developing and applying the calculation is high. Summary of the invention

[0004] The purpose of the present invention is to provide a steam pipeline optimization control method based on valve characteristics to solve the problem that the transient model is generally a set of differential equations containing time terms, which leads to high costs of simulation modeling solution methods and related IoT meters in project applications.

[0005] The present invention adopts the following technical solution: a steam pipe network optimization control method based on valve characteristics, comprising:

[0006] Step 1: Correct the factory characteristic curve of each valve in the steam network one by one to obtain the valve characteristic curve;

[0007] Step 2: Establish a steady-state model of the steam network based on its geometric parameters, physical parameters, and steady-state operation data;

[0008] Step 3: Construct a characteristic relationship database of each valve opening and hydraulic conditions of the steam pipe network;

[0009] Step 4: When the steam load at the user end changes from the first steam consumption to the second steam consumption, the opening of each valve corresponding to the second steam consumption is retrieved from the characteristic relationship database with the steady-state model of the pipeline network and the valve characteristic curve as constraints; each valve is regulated according to the retrieved opening of each valve.

[0010] Furthermore, the correction method in step 1 is:

[0011] Assuming that each valve has multiple openings, calculate the deviation between the actual flow corresponding to the valve core stroke at each opening and the flow marked on the valve's factory characteristic curve, and use the deviation to correct the valve's factory characteristic curve to obtain the valve characteristic curve.

[0012] Furthermore, the calculation formula for step 1 correction is:

[0013] (Q+ΔQ) / Q max =f(L / L max )

[0014] Where: Q is the flow rate at a certain opening on the factory characteristic curve of the valve;

[0015] Q max —Flow rate of the valve in the fully open state on the factory characteristic curve;

[0016] L—The stroke of the valve core at a certain opening on the factory characteristic curve of the valve;

[0017] L max —The stroke of the valve core in the fully open state on the factory characteristic curve of the valve;

[0018] ΔQ—The flow rate Q marked on the factory characteristic curve when the valve is at opening L and the actual flow rate Q on site ’ The deviation, that is, ΔQ = Q ’ -Q.

[0019] Furthermore, in step 3, a characteristic relationship database of the valve openings and hydraulic conditions of the steam network is constructed, specifically:

[0020] Step 301: forming a valve opening degree data matrix according to multiple opening degrees of multiple valves;

[0021] Step 302: adjust the opening of any one of the multiple valves, and count the flow vectors of the pipe network, and then obtain the flow vectors corresponding to all the openings of all the valves.

[0022] Furthermore, the flow vector of the pipe network in step 302 includes the flow of each user node and the flow of each internal node.

[0023] The beneficial effects of the present invention are:

[0024] In the steam network control, since the valves that can be manually adjusted are relatively simple and the number is small, the present invention couples and enumerates the adjustment characteristics of these valves with the steady-state model of the network, forms a characteristic relationship database of the steam network system with the valve opening and flow set, and then controls the valves of the steam network;

[0025] Since the number of pipeline network steady-state models and valve opening data matrices is limited, the present invention couples and enumerates the two to form a characteristic relationship database, which greatly simplifies modeling and solving, reduces costs and ensures the effectiveness of subsequent applications. DETAILED DESCRIPTION

[0026] The present invention is described in detail below in conjunction with specific implementation modes.

[0027] The present invention discloses a steam pipe network optimization control method based on valve characteristics, comprising:

[0028] Step 1: Correct the factory characteristic curve of each valve in the steam network one by one to obtain the valve characteristic curve;

[0029] Among them, the correction method in step 1 is:

[0030] Assuming that each valve has multiple openings, calculate the deviation between the actual flow corresponding to the valve core stroke at each opening and the flow marked on the valve's factory characteristic curve, and use the deviation to correct the valve's factory characteristic curve to obtain the valve characteristic curve.

[0031] Among them, the calculation formula for step 1 correction is:

[0032] (Q+ΔQ) / Q max =f(L / L max )

[0033] Where: Q is the flow rate at a certain opening on the factory characteristic curve of the valve;

[0034] Q max —Flow rate of the valve in the fully open state on the factory characteristic curve;

[0035] L—The stroke of the valve core at a certain opening on the factory characteristic curve of the valve;

[0036] L max —The stroke of the valve core in the fully open state on the factory characteristic curve of the valve;

[0037] ΔQ—The flow rate Q marked on the factory characteristic curve when the valve is at opening L and the actual flow rate Q on site ’ The deviation, that is, ΔQ = Q ’ -Q.

[0038] The specific correction is: sort out the regulating valves in the steam network, the total number is i, and the mth valve is marked as A m ; For all valves: A1, A2, ...A m …A i Collect and record the factory characteristic curves of each valve; i To correct the characteristic curve, the specific operations are as follows:

[0039] Based on the factory characteristic curve, the valve opening is divided into j parts, and the nth valve opening is recorded as B n ; When the valve opening is B1, record the deviation ΔQ1 between the valve core stroke L1 and the flow rate Q1 marked on the factory characteristic curve; for each valve opening B j , perform the above operations one by one, according to the recorded data ΔQ1, ΔQ2, ... ΔQ n ,…ΔQ j According to the above method, each valve in the pipe network is operated to complete the characteristic curve correction of all regulating valves.

[0040] Step 2: Establish a steady-state model of the pipe network based on the geometric parameters, physical parameters, and steady-state operation data of the steam pipe network; collect the geometric parameters, physical parameters, and steady-state operation data of the pipe network to complete the establishment of the steady-state model of the pipe network, which includes the temperature, pressure, and flow parameters of each node of the pipe network. According to multiple sets of steady-state data on site, the modeling parameters in the steady-state model are corrected so that the accuracy of the steady-state model in the pipe network meets the project requirements.

[0041] Step 3: Construct a database of the characteristic relationships between the valve openings and hydraulic conditions of the steam network.

[0042] Among them, in step 3, a characteristic relationship database of each valve opening and hydraulic condition of the steam pipe network is constructed, specifically:

[0043] Step 301: forming a valve opening degree data matrix according to multiple opening degrees of multiple valves;

[0044] Step 302: adjust the opening of any one of the multiple valves, and count the flow vectors of the pipe network, and then obtain the flow vectors corresponding to all the openings of all the valves.

[0045] The flow vector of the pipe network in step 302 includes the flow of each user node and the flow of each internal node.

[0046] Construct the valve opening data matrix O of the pipeline network valve, which contains i rows and j columns:

[0047]

[0048] Item a1b1 represents the state of valve A1 when it is opened at B1.

[0049] Item a1b2 represents the state of valve A1 when it is opened at B2.

[0050] …

[0051] Item a2b1 represents the state of valve A2 when it is opened at B1.

[0052] …

[0053] Item a m b n Indicates valve A m In B n The state of opening;

[0054] For the opening database O, only the opening of valve A1 is adjusted at a time, and the database O has a total of n states;

[0055] Based on these n states, each opening of valve A2 is adjusted once, and n new states are formed. At this time, the database O has n*n=n 2 status;

[0056] In n 2 Based on the state, only the opening of valve A3 is adjusted at a time. At this moment, database O has a total of n 2 *n=n 3 status;

[0057] …

[0058] The total number of states of the opening database O with a total number of valves m and a total number of openings n is n m indivual.

[0059] Mark the valve opening states of the pipeline network under all combinations of each valve opening state, there are k of them, counted as O k ; When the pipeline valve opening state is O1, the flow of each node in the pipeline network constitutes the flow vector Q1 under this working condition; when the pipeline valve opening state is O2, the flow of each node in the pipeline network constitutes the flow vector Q2 under this working condition; according to the above method, the flow vectors of each node in the pipeline network corresponding to all pipeline valve opening states are enumerated, and the characteristic relationship database is sorted out.

[0060] Step 4: When the steam load at the user end changes from the first steam consumption to the second steam consumption, the opening of each valve corresponding to the second steam consumption is retrieved from the characteristic relationship database with the steady-state model of the pipeline network and the valve characteristic curve as constraints; each valve is regulated according to the retrieved opening of each valve.

[0061] Specifically, in a certain steady-state condition, the flow of each user node and the flow of the internal node of the pipeline network form a flow vector Q 0 , at the next time t1, a user node Q x1 0 Change to Q due to changes in user usage x1 t1 In order to ensure the stability of steam consumption for other users, a combination of data O of each valve opening value is selected according to the characteristic relationship database.kt1 , satisfying the network flow vector Q kt1 The traffic values ​​of each user node and the internal node are [Q x1 t1 ,Q x2 0 ,Q x3 0 …,Q ’ y1 t1 ,Q ’ y2 t1 ,Q ’ y3 t1 …Q y1 t1 ,Q y2 t1 ,Q y3 t1 ...]; combined data of valve opening value O kt1 Each element in represents the opening value of each valve that meets the above hydraulic conditions; that is, a1b x =L A1 t1 , L A1 t1 is the opening value L of valve A1 at time t1 A1 t1 Marked as a1b in the opening database x .

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A steam pipe network optimization control method based on valve characteristics, characterized in that: include: Step 1: Correct the factory characteristic curve of each valve in the steam network one by one to obtain the valve characteristic curve; Step 2: Establish a steady-state model of the steam network based on its geometric parameters, physical parameters, and steady-state operation data; Step 3: Construct a characteristic relationship database of each valve opening and hydraulic conditions of the steam pipe network; Step 4: When the steam load at the user end changes from the first steam consumption to the second steam consumption, the opening of each valve corresponding to the second steam consumption is retrieved from the characteristic relationship database with the steady-state model of the pipeline network and the valve characteristic curve as constraints; each valve is regulated according to the retrieved opening of each valve.

2. The method for optimizing and controlling a steam pipe network based on valve characteristics according to claim 1, characterized in that: The correction method in step 1 is: Assuming that each valve has multiple openings, calculate the deviation between the actual flow corresponding to the valve core stroke at each opening and the flow marked on the valve's factory characteristic curve, and use the deviation to correct the valve's factory characteristic curve to obtain the valve characteristic curve.

3. The method for optimizing and controlling a steam pipe network based on valve characteristics according to claim 2, characterized in that: The calculation formula for step 1 correction is: (Q+ΔQ) / Q max =f(L / L max ) Where: Q is the flow rate at a certain opening on the factory characteristic curve of the valve; Q max —Flow rate of the valve in the fully open state on the factory characteristic curve; L—The stroke of the valve core at a certain opening on the factory characteristic curve of the valve; L max —The stroke of the valve core in the fully open state on the factory characteristic curve of the valve; ΔQ—The flow rate Q marked on the factory characteristic curve when the valve is at opening L and the actual flow rate Q on site ’ The deviation, that is, ΔQ = Q ’ -Q.

4. The method for optimizing and controlling a steam pipe network based on valve characteristics according to claim 1, characterized in that: In step 3, a characteristic relationship database of the valve opening and hydraulic conditions of the steam network is constructed, specifically: Step 301: forming a valve opening degree data matrix according to multiple opening degrees of multiple valves; Step 302: adjust the opening of any one of the multiple valves, and count the flow vectors of the pipe network, and then obtain the flow vectors corresponding to all the openings of all the valves.

5. The method for optimizing and controlling a steam pipe network based on valve characteristics according to claim 1, characterized in that: The flow vector of the pipe network in step 302 includes the flow of each user node and the flow of each internal node.

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