A gas multi-branch fan valve control system and a control method thereof

Abstract

This invention relates to a fan and valve control system and its control method in a multi-branch gas pipeline system. The system includes a fan for powering gas flow in a main pipeline; a pipeline group for diverting gas from the main pipeline, comprising valves, flow meters, and branch pipelines; the fan, main pipeline, valves, flow meters, and branch pipelines are connected sequentially; the pipeline group comprises several groups, each connected to the main pipeline; and the ends of each branch pipeline group are connected to the same pressure environment; a control module for setting, collecting, and sending control commands; the fan, valves, and flow meters are electrically connected to the control module; the module sets the flow rate setpoint for each branch pipeline, controls the valve opening, controls the flow meter to collect data from the branch pipelines, and controls the fan speed to ensure the branch pipelines reach the set flow rate. This invention satisfies the airflow requirements of each branch pipeline while keeping the fan in a state of minimum energy consumption, thus achieving energy saving.

Description

Technical Field

[0001] This invention belongs to the field of fan valve control technology, specifically relating to a fan valve control system and control method in a multi-branch gas flow system. Background Technology

[0002] Currently, in gas supply systems, fans power the gas flow, and valves regulate the gas flow in the pipelines to achieve the target flow rate. Existing control strategies typically involve directly setting the target fan speed and using valves to control the flow distribution in each branch. If the gas supply system is used for short periods, the time and electricity consumption are minimal, and the overall energy consumption will not have a significant impact. However, if the gas supply system operates for extended periods, even small energy savings can translate into substantial production cost reductions. Therefore, adjusting the control strategy in the gas supply system is crucial for enterprises to save on production costs. Summary of the Invention

[0003] To solve the above-mentioned technical problems, the present invention provides a control system and method for a fan valve in a multi-branch gas pipeline, which can meet the air volume requirements of each pipeline branch while keeping the fan in a state of minimum energy consumption, so as to achieve the goal of energy saving.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A gas multi-branch fan valve control system, including

[0006] A fan is used to power the flow of gas in a duct; the fan delivers air through the main duct.

[0007] A pipeline group is used to divert gas in the main pipeline. The pipeline group includes a damper, a flow meter, and pipeline branches. The fan, main pipeline, damper, flow meter, and pipeline branches are connected in sequence. The pipeline group includes several groups, each of which is connected to the main pipeline. The ends of the pipeline branches in each group are connected to the same pressure environment.

[0008] The control module is used for setting values, collecting values, and sending control commands. The fan, air valve, and flow meter are electrically connected to the control module. The control module includes: a setting calculation module, used to detect the number of pipe groups that are open, and calculate the pressure difference of each pipe branch under the flow set value based on the flow set value of each pipe branch in the opened pipe group; and a flow control module, used to, based on the calculated pressure difference of each pipe branch, fully open the air valve on the pipe branch with the largest pressure difference, adjust the fan speed to make the pipe branch reach the flow set value, collect data of each pipe branch, and adjust the opening degree of other air valves except the air valve of the pipe branch to make each pipe branch reach the flow set value.

[0009] Furthermore, the setting calculation module also includes a storage module for storing the pressure difference and flow characteristic curves of each pipeline branch.

[0010] The present invention also provides a method for controlling the air valve of a multi-branch gas fan, comprising the following steps:

[0011] S1: Set the air valve to Valve, the air valve opening signal to Opening, the flow meter measurement value to Vmeasure, the pipeline branch to T, the flow rate setpoint of the pipeline branch to Vset, the fan speed to RPMset, the pressure difference of the pipeline branch to deltaP, and the pressure difference and flow characteristic curve of the pipeline branch to Func.

[0012] S2: Detects the number of pipe groups opened by setting the calculation module;

[0013] S3: When the number of pipe groups open is 1, set the target pipe branch to T_1, then set the Valve's Opening to fully open, and adjust RPMset to make Vmeasure reach Vset;

[0014] S4: When the number of pipe groups open is greater than 1, the number of pipe groups is set to n, each pipe branch is set to T_1~T_n, each air valve is set to Valve_1~Valve_n, each air valve opening signal is set to Opening_1~Opening_n, and each flow meter measurement value is set to Vmeasure_1~Vmeasure_n. Vmeasure_n, each pipeline branch is designated as T_1~T_n. The storage module of the calculation module stores the pressure drop and flow characteristic curves Func_1~Func_n of each pipeline branch. Func represents the relationship between the pressure difference deltaP in the pipeline branch and the flow rate Vset of the gas passing through it. A mathematical model of pipeline pressure drop and flow rate is established, and the functional relationship deltaP=f(Vset) is obtained. Here, the variable Vset is the flow rate setpoint of each pipeline branch, designated as Vset_1~Vset_n; deltaP is the pressure difference of each pipeline branch obtained according to the functional relationship, designated as deltaP_1~deltaP_n. The pipeline branch with the largest pressure difference is numbered a (a is one of 1~n). The air valve Valve_a is fully open, and the fan adjusts the speed RPMset to make pipeline branch T_a reach the flow rate setpoint Vset_a. Each flow meter collects data of each pipeline branch, and the flow control module adjusts the opening of other air valves except air valve Valve_a to make each pipeline branch reach the flow rate setpoint.

[0015] Furthermore, the storage module in S4 records the adjusted fan speed and the opening signals of each air valve to correspond to the number of pipe groups and the flow rate setting value of each pipe branch.

[0016] Compared with the prior art, the advantages of this invention are as follows: After setting the flow rate setpoint for each pipeline branch, the pressure difference of each pipeline branch is calculated using the function relationship deltaP=f(Vset). The air valve of the pipeline branch with the largest pressure difference is fully opened, and the fan speed is adjusted to make the pipeline branch reach the flow rate setpoint. Other air valves outside this pipeline branch are adjusted by adjusting their opening degrees. Each flow meter collects data from each pipeline branch and adjusts other air valves to make each pipeline branch reach the flow rate setpoint. Under this operation, the optimal coordination between the fan and the air valve is achieved through the control of the air valves and the coordination of the fan speed. This not only achieves the flow rate setpoint but also ensures that the fan maintains the lowest energy consumption state under normal operation, thereby reducing the power consumption of the fan. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram showing the connections of the various devices in the system of the present invention;

[0019] Figure 2 This is a schematic block diagram of a sub-module of the control module in the system of the present invention;

[0020] Figure 3 This is a flowchart of the main steps of the method of the present invention.

[0021] The components include: 1. Fan; 11. Main duct; 2. Pipeline assembly; 21. Air valve; 22. Flow meter; 23. Pipeline branch; 3. Control module; 31. Setting calculation module; 311. Storage module; 32. Flow control module. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this invention, and not all of them. Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0023] The specific embodiments of the present invention will now be described with reference to the accompanying drawings:

[0024] like Figure 1-3As shown, a multi-branch gas fan valve control system includes...

[0025] Fan 1 is used to provide power for the flow of gas in the pipeline. Fan 1 delivers air through the main pipeline 11.

[0026] Pipeline group 2 is used to divert gas from the main pipeline 11. Pipeline group 2 includes a damper 21, a flow meter 22, and pipeline branches 23. The fan 1, main pipeline 11, damper 21, flow meter 22, and pipeline branches 23 are connected sequentially. Pipeline group 2 comprises several groups, each group connected to the main pipeline 11. The ends of each pipeline branch 23 are connected to the same pressure environment, which can be atmospheric or the same gas container. Each pipeline branch 23 may contain components for gas processing, such as pipes, heat exchangers, reactors, etc., but the gas processing components do not include other adjustable valves.

[0027] The control module 3 is used for setting values, collecting values, and sending control commands. The fan 1, the air valve 21, and the flow meter 22 are electrically connected to the control module 3. The control module 3 includes: a setting calculation module 31, used to detect the number of pipe groups 2 open, and calculate the pressure difference of each pipe branch 23 under the flow setting value according to the flow setting value of each pipe branch 23 of the opened pipe group 2; and a flow control module 32, used to adjust the opening of the air valve 21 on the pipe branch 23 with the largest pressure difference according to the calculated pressure difference of each pipe branch 23. The fan 1 adjusts its speed to make the pipe branch 23 reach the flow setting value, and each flow meter 22 collects data of each pipe branch 23 and adjusts the opening of other air valves 21 except for the air valve 21 of the pipe branch 23 so that each pipe branch 23 reaches the flow setting value.

[0028] Furthermore, the setting calculation module 31 also includes a storage module 311 for storing the pressure difference and flow characteristic curves of each pipeline branch 23.

[0029] Description of the working principle of this invention:

[0030] The gas multi-branch fan valve control system with this structure consists of several sets of pipe groups 2, each with its own valve 21, flow meter 22, and pipe branches 23. Each valve 21 is connected to a main pipe 11, which supplies air via a fan 1. Therefore, when there is only one set of pipe groups 2, the flow rate can be adjusted by fully opening the valve 21 and adjusting the fan 1 speed to reach the set flow rate value. When there are multiple sets of pipe groups 2, the pressure difference and flow characteristic curves of each pipe branch 23 stored in the storage module 311 of the calculation module 31 are used. The pressure difference of each pipe branch 23 is calculated using the function deltaP=f(Vset). The valve 21 of the pipe branch 23 with the largest pressure difference is fully opened, and the fan 1 speed is adjusted to reach the set flow rate value for that pipe branch 23. Then, by adjusting the opening of the valves 21 of other pipe branches 23, the flow rate of each pipe branch 23 can be adjusted to reach its set flow rate value, thus ensuring that the use of each pipe branch 23 is met even at the lowest fan 1 speed.

[0031] The method and steps for controlling the air valve 21 of the multi-branch gas fan 1 in this invention:

[0032] S1: Set the damper 21 to Valve, the opening signal of the damper 21 to Opening, the measured value of the flow meter 22 to Vmeasure, the pipe branch 23 to T, the flow set value of the pipe branch 23 to Vset, the speed of the fan 1 to RPMset, the pressure difference of the pipe branch 23 to deltaP, and the pressure difference and flow characteristic curve of the pipe branch 23 to Func.

[0033] S2: The number of pipe groups 2 opened is detected by setting the calculation module 31;

[0034] S3: When the number of pipe group 2 open is 1, set the target pipe branch 23 to T_1, then set the Valve's Opening to fully open, and adjust RPMset to make Vmeasure reach Vset;

[0035] S4: When the number of pipe groups 2 open is greater than 1, the number of pipe groups 2 is set to n, each pipe branch 23 is set to T_1~T_n, each air valve 21 is set to Valve_1~Valve_n, the opening signal of each air valve 21 is set to Opening_1~Opening_n, and the measurement value of each flow meter 22 is set to Vmeasure_1~Vmeasure_n. Vmeasure_n, each pipeline branch 23 is divided into T_1~T_n. The storage module 311 of the calculation module 31 stores the pressure drop and flow characteristic curves Func_1~Func_n of each pipeline branch 23. Func represents the relationship between the pressure difference deltaP in the pipeline branch 23 and the flow rate Vset of the gas passing through it. A mathematical model of pipeline pressure drop and flow rate is established, and the functional relationship deltaP=f(Vset) is obtained. Here, the variable Vset is the flow rate setpoint of each pipeline branch 23, divided into Vset_1~Vset_n; deltaP is the pressure difference of each pipeline branch 23 obtained according to the functional relationship, divided into deltaP and deltaP. ltaP_1~deltaP_n, where the pipe branch 23 with the largest pressure difference is numbered a (a is one of 1~n). The air valve 21Valve_a is fully open. The fan 1 adjusts the speed RPMset to make the pipe branch 23T_a reach the flow set value Vset_a. Each flow meter 22 collects data from each pipe branch 23. The flow control module 32 adjusts the opening degree of other air valves 21 besides air valve 21Valve_a to make each pipe branch 23 reach the flow set value. After the adjustment is completed, the storage module 311 records the adjusted fan 1 speed and the opening degree signal of each air valve 21 to correspond to the number of pipe groups 2 and the flow set value of each pipe branch 23.

[0036] The beneficial effects of this invention are as follows: After setting the flow rate setpoint for each pipeline branch 23, the pressure difference of each pipeline branch 23 is calculated using the function relationship deltaP=f(Vset). The damper 21 of the pipeline branch 23 with the largest pressure difference is fully opened, and the speed of the fan 1 is adjusted to make the pipeline branch 23 reach the flow rate setpoint. The other dampers 21 outside the pipeline branch 23 are adjusted, and the flow meters 22 collect data from each pipeline branch 23, adjusting the other dampers 21 to make each pipeline branch 23 reach the set flow rate. When the flow rate is set to the set value, under this operation, the fan 1 can operate at the speed and power consumption of the pipe branch 23 and the air valve 21 fully open under the maximum pressure difference, maintaining the lowest energy consumption under normal operation, thereby reducing the power consumption of the fan 1 and achieving the optimal coordination between the fan 1 and the air valve 21. After the adjustment is completed, the adjusted fan 1 speed and the opening signals of each air valve 21 are stored to correspond to the number of pipe groups 2 and the flow rate set value of each pipe branch 23. In the future, when encountering the same usage situation, the data can be retrieved for quick adjustment.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A control system for a multi-branch gas fan valve, characterized in that: include A fan is used to power the flow of gas in a duct; the fan delivers air through the main duct. A pipeline assembly is used to divert gas from the main pipeline. The pipeline assembly includes a damper, a flow meter, and pipeline branches, and the fan, main pipeline, damper, flow meter, and pipeline branches are connected in sequence. The control module is used for setting values, collecting values, and sending control commands. The fan, air valve, and flow meter are electrically connected to the control module. The module sets the flow rate set value of the pipeline branch, controls the opening of the air valve, controls the flow meter to collect data of the pipeline branch, and controls the fan speed to make the pipeline branch reach the flow rate set value. The pipeline group includes several groups, each group of which is connected to the main pipeline, and the ends of the branches of each group of pipelines are connected to the same pressure environment. The control module includes: The calculation module is set to detect the number of pipe groups that are open, and calculate the pressure difference of each pipe branch under the flow rate set value based on the flow rate set value of each pipe branch in the opened pipe group. The flow control module is used to calculate the pressure difference of each pipeline branch. The air valve on the pipeline branch with the largest pressure difference is fully opened, and the fan adjusts its speed to make the pipeline branch reach the flow set value. Each flow meter collects data from each pipeline branch and adjusts the opening of other air valves except the air valve of that pipeline branch so that each pipeline branch reaches the flow set value.

2. The gas multi-branch fan valve control system according to claim 1, characterized in that: The setting calculation module also includes a storage module for storing the pressure difference and flow characteristic curves of each pipeline branch.

3. A method for controlling the damper of a multi-branch gas fan, based on the multi-branch gas fan damper control system as described in any one of claims 1 to 2, characterized in that: Includes the following steps: S1: Set the air valve to Valve, the air valve opening signal to Opening, the flow meter measurement value to Vmeasure, the pipeline branch to T, the flow rate setpoint of the pipeline branch to Vset, the fan speed to RPMset, the pressure difference of the pipeline branch to deltaP, and the pressure difference and flow characteristic curve of the pipeline branch to Func. S2: Detects the number of pipe groups opened by setting the calculation module; S3: When the number of pipe groups open is 1, the target pipe branch is set to T_1, then the Valve's Opening is set to fully open, and Vmeasure is adjusted to Vset by adjusting RPMset; S4: When the number of pipe groups open is greater than 1, the number of pipe groups is set to n, each pipe branch is set to T_1~T_n, each air valve is set to Valve_1~Valve_n, each air valve opening signal is set to Opening_1~Opening_n, and each flow meter measurement value is set to Vmeasure_1~Vmeasure_n. Vmeasure_n, each pipeline branch is designated as T_1~T_n. The storage module of the calculation module stores the pressure drop and flow characteristic curves Func_1~Func_n of each pipeline branch. Func represents the relationship between the pressure difference deltaP in the pipeline branch and the flow rate Vset of the gas passing through it. A mathematical model of pipeline pressure drop and flow rate is established, and the functional relationship deltaP=f(Vset) is obtained. Here, the variable Vset is the flow rate setpoint of each pipeline branch, designated as Vset_1~Vset_n; deltaP is the pressure difference of each pipeline branch obtained according to the functional relationship, designated as deltaP_1~deltaP_n. The pipeline branch with the largest pressure difference is numbered a (a is one of 1~n). The air valve Valve_a is fully open, and the fan adjusts the speed RPMset to make pipeline branch T_a reach the flow rate setpoint Vset_a. Each flow meter collects data of each pipeline branch, and the flow control module adjusts the opening of other air valves except air valve Valve_a to make each pipeline branch reach the flow rate setpoint.

4. The method for controlling the fan valve in a multi-branch gas circuit according to claim 3, characterized in that: The storage module in S4 records the adjusted fan speed and the opening signals of each air valve, corresponding to the number of pipe groups and the flow rate setting value of each pipe branch.

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