Flow rate adjustment control method for a group of air supply valves

Abstract

This application relates to a method for controlling the flow rate of an air inlet valve group in the field of steel metallurgy, which solves the problem of slow speed and low accuracy of the conventional air inlet model flow rate control method. The method collects the stored openings of the regulating valves for the design flow rate of the air inlet model under different pressures of the air inlet branch lines and the main line, and creates a stored opening set K of the design flow rate of the air inlet model. j and establishing K j and then, depending on the design flow rate of the supply air model to be switched to, j The jth flow rate memory opening set K corresponding to j and a step of selecting the storage opening K of the adjustment valve of the design flow rate of the air supply model according to the pressure of the air supply branch line and the pressure of the main line. ji and a step of determining the stored opening of the adjusting valve K ji a step of controlling the flow rate to be adjusted to K after the adjustment is completed, a step of measuring the actual flow rate, calculating the accuracy of the actual flow rate, determining whether the actual flow rate is in a stable state, and calculating the continuous stability rate; j and determining whether to update K. This method has fast adjustment speed and high accuracy.

Description

[Technical Field]

[0001] This application relates to the technical field of iron and steel metallurgy, and more particularly to a method for controlling the flow rate of a group of air supply valves. [Background technology]

[0002] In the converter steelmaking process, blowing gas from the bottom of the converter into the high-temperature molten pool effectively improves the agitation of the molten metal, promotes the slag-steel reaction, and further promotes the homogenization of the composition and temperature of the molten metal, thereby improving the quality and efficiency of converter smelting. Depending on the converter's production and smelting characteristics, bottom-blowing gas supply to the converter is intermittent and periodic, and in each cycle, the bottom-blowing gas flow rate is adjusted according to the different characteristics of each stage of converter smelting.

[0003] To meet the control needs of the converter's smelting process, it is necessary to quickly and accurately adjust the flow rate at various stages of the smelting process. Many conventional bottom-blowing air supply models set the flow rate according to the model and automatically adjust the flow rate using a system control valve or flow control device. The adjustment speed and accuracy of this method depend mainly on the characteristics of the control valve or flow control device itself, and extensive adjustment of the related equipment is required each time the flow rate is adjusted. This not only results in a slow adjustment speed, but the frequent operation also affects the stability and accuracy of the related equipment. [Overview of the Initiative] [Problems that the invention aims to solve]

[0004] Taking the above analysis into consideration, the present invention aims to provide a flow rate control method for a group of air supply valves in order to solve the problems of slow adjustment speed and low adjustment accuracy in conventional air supply model flow rate adjustment methods in converter smelting processes.

[0005] The objectives of this application are primarily achieved through the following technical solutions.

[0006] A method for controlling the flow rate of a group of air supply valves, Design flow rate Q of the air supply model j Collect the stored opening degrees of the regulating valve at the pressures of different air supply branch paths and the main path for the design flow rate Q of the air supply model j The j-th flow rate stored opening degree set K composed of the stored opening degrees of the control valve at the pressures of different air supply branch paths and the main path for the design flow rate Q j Step 1 of establishing The j-th flow rate stored opening degree set K j Step 2 of establishing the set K composed of When the air supply model switches the design flow rates of different air supply models, first, according to the design flow rate Q of the air supply model at the switching destination j Corresponding to, select the j-th flow rate stored opening degree set K j Corresponding to Q from the set K j Step 3 of selecting The pressure P of the corresponding air supply branch path 1i And the pressure P of the main path 0i According to, for the design flow rate Q of the air supply model j The pressure P of the corresponding air supply branch path 1i And the pressure P of the main path 0i The stored opening degree K of the regulating valve at ji Step 4 of determining Control the regulating valve to be adjusted to the stored opening degree K ji Step 5 of adjusting When the adjustment of the regulating valve is completed, measure the actual flow rate Q j′ At this time The actual flow rate Q j′ Based on, calculate the actual flow rate adjustment accuracy R j′ The air supply model determines whether the actual flow rate Q j′ Is in a stable state, and calculates the continuous stability rate within the design flow rate adjustment accuracy R j′ Of the actual flow rate Q j Step 7 of calculating The air supply model determines whether to update K j According to the update condition, if no update is required, the adjustment of the current air supply valve is completed. If an update is required, the adjustment of the current air supply valve is completed after the update is completed. Step 8 includes

[0007] Furthermore, step 1 is, Design flow rate Q for the air supply model j The pressure P in the air supply branch line 1i and the pressure P of the main passage 0i Memory opening K of the adjustment valve ji Collect the data, where i = 1, 2, 3...n and j = 1, 2, 3...m, step, Design flow rate Q for the air supply model j The pressure P in the air supply branch line 1i and the pressure P of the main passage 0i The memory opening setting K of the adjustment valve. ji The j-th flow memory opening set K consists of the following: j Establish K j ={K j1 , K j2 ,..., K ji ,..., K jn}, where i = 1, 2, 3...n and j = 1, 2, 3...m, including the step and .

[0008] Furthermore, the design flow rate Q of the aforementioned air supply model j The pressure P in the air supply branch line 1i and the pressure P of the main passage 0i The adjustment valve memory opening degree K ji is, t j This is the opening degree of the adjustment valve when it is ≥20%, and t j However, this represents the continuous stability rate within the design adjustment accuracy range for the actual flow rate.

[0009] Furthermore, the aforementioned t j =T j / T 0j It is ×100%, Here, T j This is the continuous stabilization period s of the actual flow rate within the design flow rate adjustment accuracy range. T 0j This is the set air supply period s for the design flow rate of the air supply model.

[0010] Furthermore, the design flow rate adjustment accuracy R j =±(7.25-1.16ln(Q j )) and Here, Rj This is the design flow rate adjustment accuracy. Q j This is the design flow rate Nm³ for the air supply model. 3 It is / h.

[0011] Furthermore, in step 7, the air supply model is the actual flow rate Q j′ Determining whether or not it is in a stable state is Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j In the following cases, the actual flow rate Q j′ It was determined that it was in a stable state. Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j If it is greater than, the actual flow rate Q j′ This includes determining that the state is unstable.

[0012] Furthermore, the actual flow rate adjustment accuracy is R j′ =|(Q j -Q j′ ) / Q j |

[0013] Furthermore, the update conditions include the following: The air supply model has an actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j Whether or not it falls within the range, and the design flow rate adjustment accuracy R of the actual flow rate. j Continuous stability rate t within the range j We determine whether it is 20% or more. Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j The following applies, and the design flow rate adjustment accuracy R of the actual flow rate. j Continuous stability rate t within the range j If it is 20% or more, the actual flow rate Q j′ It is in a stable state, K j Without updating K, the flow rate adjustment of the air supply valve is completed.

[0014] Furthermore, the update conditions further include the following: Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R jThe following applies to the actual flow rate and the design flow rate adjustment accuracy R. j Continuous stability rate t within the range j If it is less than 20%, the actual flow rate Q j′ When the system is in an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow rate, and the design flow rate adjustment accuracy R j Continuous stability rate t within the range j Set it to 20% or more, record the opening degree of the adjustment valve, K j The values ​​of and K are updated, and the flow rate adjustment of the air supply valve is completed.

[0015] Furthermore, the update conditions further include the following: Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j Larger than the actual flow rate, and with design flow rate adjustment accuracy R j Continuous stability rate t within the range j If it is less than 20%, the actual flow rate Q j′ When the system is in an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow rate, and the design flow rate adjustment accuracy R j Continuous stability rate t within the range j Set it to 20% or more, record the opening degree of the adjustment valve, K j The values ​​of and K are updated, and the flow rate adjustment of the air supply valve is completed.

[0016] Compared to conventional technology, this invention can achieve at least one of the following beneficial effects. 1. The present invention, in the air supply model, establishes memory opening sets for the regulating valves at different design flow rates and different pressures in the air supply branch and main lines. Subsequently, when performing corresponding flow rate adjustments, the regulating valves of the air supply valve group can be quickly adjusted to the corresponding opening based on the data in the memory opening sets of the regulating valves. The flow rate adjustment speed of the regulating valves is 10s or less, and the flow rate adjustment accuracy range is ±1Nm 3 The flow rate is / h, and the flow rate stability coefficient is 0.02 or less. Compared to conventional technology, the flow rate adjustment speed and accuracy are improved. 2. In the intake air model of the method of the present application, for different design flow rates, the memory opening degree settings of the adjustment valve at the pressures of different intake air branch paths and the main path are established, and then when performing the corresponding flow rate adjustment, the memory opening degree settings of the adjustment valve are updated according to the adjustment results, so as to ensure the accuracy when the intake air model adjusts the intake air valve group.

[0017] In the present application, by combining the above technical solution means with each other, more preferred combination solution means can also be realized. Other features and advantages of the present application will be described in the following specification. Some advantages will be apparent from the specification or can be understood by implementing the present application. The object and other advantages of the present application can be obtained by realizing through the content specifically pointed out in the specification and drawings.

Brief Description of the Drawings

[0018] The attached drawings are for showing specific embodiments and do not limit the present application. Throughout the attached drawings, the same reference numerals indicate the same components. [Figure 1] FIG. 1 is a flowchart of the flow rate adjustment control method for the intake air valve group of the present application. ​​​​​​​​​​​​​​​​​​​ The j-th flow rate memory opening set K j Step 2 of establishing the set K composed of When switching the design flow rate of an air supply model with a different air supply model, first, the design flow rate Q of the air supply model at the switching destination j According to, from the set K to Q j The j-th flow rate memory opening set K corresponding to j Step 3 of selecting The pressure P of the corresponding air supply branch 1i And the pressure P of the main path 0i According to, the design flow rate Q of the air supply model j Of, the pressure P of the corresponding air supply branch 1i And the pressure P of the main path 0i At, the memory opening K of the adjustment valve ji Step 4 of determining Control the adjustment valve to adjust to the memory opening K ji Step 5 of The actual flow rate Q at this time when the adjustment of the adjustment valve is completed j′ Step 6 of measuring Based on the actual flow rate Qj′, calculate the actual flow rate adjustment accuracy R j′ The air supply model determines whether the actual flow rate Q j′ Is in a stable state, and the actual flow rate Q j′ Of, calculate the continuous stability rate within the design flow rate adjustment accuracy R j Step 7 of The air supply model determines whether to update K j And K according to the update conditions. If no update is required, the adjustment of the current air supply valve is completed. If an update is required, the adjustment of the current air supply valve is completed after the update. Step 8 includes.

[0021] During the steelmaking process in a converter, flow rate adjustment is achieved through an air supply model. Many conventional air supply models set the flow rate according to the model and automatically adjust the flow rate using a system adjustment valve or flow rate adjustment device. The adjustment speed and accuracy of this method mainly depend on the characteristics of the adjustment valve or flow rate adjustment device itself, requiring extensive adjustment of related equipment each time the flow rate is adjusted, resulting in slow adjustment speeds and relatively low accuracy. In the present invention, the air supply model establishes memory opening sets for the adjustment valves at different design flow rates, different pressures in the air supply branch lines, and different pressures in the main line. Subsequently, when performing the corresponding flow rate adjustment, the air supply valve group can be quickly adjusted to the corresponding opening based on the data in the memory opening set of the adjustment valves. The flow rate adjustment speed is 10s or less, and the flow rate adjustment accuracy range is ±1Nm 3 The flow rate is / h, and the flow rate stability coefficient is 0.02 or less. Compared to conventional technology, the flow rate adjustment speed and accuracy are improved.

[0022] Specifically, in Step 1, first, the pressure P of the supply air branch is determined based on the design flow rate Q1 of the supply air model. 1i and the pressure P of the main passage 0i Memory opening K of the adjustment valve 1i Collect (i=1, 2, 3...n), The memory opening degree K 1i This is the opening degree of the control valve when t1 ≥ 20%. Here, t1 is the actual flow rate Q. 1′ This is the continuous stability rate within the design flow rate adjustment accuracy range R1, where t1 = T1 / T 01 It is ×100%. Here, T1 is Q within the design flow rate adjustment accuracy range R1. 1′ This is a period of continuous stability, T 01 This is the set supply period for the design flow rate Q1 of the supply air model, Here, R1 = ±(7.25 - 1.16ln(Q1)), and the actual flow rate adjustment accuracy R 1′ =|(Q1-Q 1′ ) / Q1| and the actual flow rate adjustment accuracy R 1′ If R ≤ R1, 1′ The design flow rate adjustment accuracy range R1 is within the actual flow rate Q. 1′ This indicates that it is in a stable state, and the actual flow rate adjustment accuracy R 1′ >In the case of R1, R1′ The actual flow rate Q is not within the design flow rate adjustment accuracy range R1. 1′ This indicates that it is in an unstable state.

[0023] For example, consider the pressure P in the air supply branch line for a model design flow rate Q1. 11 and the pressure P of the main passage 01 The memory opening degree K of the adjustment valve 11 The pressure P in the air supply branch is the model design flow rate Q1. 12 and the pressure P of the main passage 02 Memory opening K of the adjustment valve 12 Model design flow rate Q1, pressure P in the air supply branch. 13 and the pressure P of the main passage 03 Memory opening K of the adjustment valve 13 Model design flow rate Q1, pressure P in the air supply branch. 1i and the pressure P of the main passage 0i Memory opening K of the adjustment valve 1i , and the pressure P of the air supply branch line for the model design flow rate Q1. 1n and the pressure P of the main passage 0n Memory opening K of the adjustment valve 1n This refers to the memory opening degree K of the regulating valve at different pressures in the supply air branch and main air supply lines, for the design flow rate Q1 of the supply air model. 1i A first flow rate memory opening set K1 is established consisting of (i=1, 2, 3...n), and K1={K 11 , K 12 ,..., K 1i ,..., K 1n}

[0024] Similarly, the pressure P in the supply branch is the design flow rate Q2 of the supply air model. 1i and the pressure P in the main passage 0i Memory opening K of the adjustment valve 2i Collect (i=1, 2, 3…n) and store the regulating valve opening K at different pressures in the supply branch and main supply lines for the design flow rate Q2 of the supply air model. 2i A second flow rate memory opening set K2 is established consisting of (i=1, 2, 3…n), and K2={K 21 , K 22 ,..., K 2i ,..., K 2nThis results in the model design flow rate Q. j Pressure P of the air supply branch 1i and the pressure P of the main passage 0i Memory opening K of the adjustment valve ji (i=1, 2, 3…n, j=1, 2, 3…m) were collected, and the design flow rate Q of the air supply model was collected. j The memory opening degree K of the regulating valve at different pressures in the supply branch and main supply lines. ji The j-th flow rate memory opening set K consists of (i=1, 2, 3…n) j Establish K j ={K j1 , K j2 ,..., K ji ,..., K jn}

[0025] Accordingly, K ji is, t j This is the opening degree of the adjustment valve when ≥20%. Here, t j is the actual flow rate Q j′ Design flow rate adjustment accuracy R j This is the continuous stability rate within the range, and t j =T j / T 0j It is ×100%. Here, T j The design flow rate adjustment accuracy R j Q within j′ This is a period of continuous stability, T 0j This is the design flow rate Q of the air supply model. j This is the set air supply period. Here, R j =±(7.25-1.16ln(Q j )) and the actual flow rate adjustment accuracy is R j′ =|(Q j -Q j′ ) / Q j The actual flow rate adjustment accuracy R is |. j′ ≤R j In the case of R j′ Design flow rate adjustment accuracy R j Located inside, actual flow rate Q j′ This indicates that it is in a stable state, and the actual flow rate adjustment accuracy R j′ >R j In the case of R j′ Design flow rate adjustment accuracy R jNot inside, actual flow rate Q j′ This indicates that it is in an unstable state.

[0026] Step 2 involves the j-th flow memory opening set K. j A set K is established consisting of {K1, K2, ..., K}, i.e., a set of memory openings for the control valves at different pressures in the supply branch and main supply lines for each design flow rate in the supply air model, where K = {K1, K2, ..., K}. j ,..., K m}

[0027] Specifically, in step 8, the update conditions are as follows: The air supply model has an actual flow rate adjustment accuracy R. j′ Design flow rate adjustment accuracy R j Whether or not it falls within the range, and the design flow rate adjustment accuracy R of the actual flow rate. j Continuous stability rate t within the range j Determine whether it is 20% or more. Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j The following applies, and the design flow rate adjustment accuracy R of the actual flow rate. j Continuous stability rate t within the range j If it is 20% or more, the actual flow rate Q j′ It is in a stable state, K j Without updating K, the flow rate adjustment of the air supply valve is completed.

[0028] Actual flow rate adjustment accuracy R j′ Design flow rate adjustment accuracy R j The following applies to the actual flow rate and the design flow rate adjustment accuracy R. j Continuous stability rate t within the range j If it is less than 20%, the actual flow rate Q j′ When the system is in an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow rate, and the design flow rate adjustment accuracy R j Continuous stability rate t within the range j Set it to 20% or more, record the opening degree of the adjustment valve, K j The values ​​of and K are updated, and the flow rate adjustment of the air supply valve is completed.

[0029] Actual flow rate adjustment accuracy R j′Design flow rate adjustment accuracy R j Larger than the actual flow rate, and with a design flow rate adjustment accuracy R j Continuous stability rate t within the range j If it is less than 20%, the actual flow rate Q j′ When the system is in an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow rate, and the design flow rate adjustment accuracy R j Continuous stability rate t within the range j Set it to 20% or more, record the opening degree of the adjustment valve, K j The values ​​of and K are updated, and the flow rate adjustment of the air supply valve is completed.

[0030] In the present invention, the air supply model establishes memory opening sets for the regulating valves at different design flow rates and different pressures in the air supply branch and main supply lines. Subsequently, when performing corresponding flow rate adjustments, the group of air supply valves can be quickly adjusted to the corresponding openings based on the data in the memory opening sets of the regulating valves. The adjustment speed is fast and the accuracy is high. The memory opening sets of the regulating valves can be updated according to the adjustment results, ensuring the accuracy of flow rate adjustment of the group of air supply valves by the air supply model.

[0031] Examples In this embodiment, the flow rate of a specific group of air supply valves is adjusted, and the method is Design flow rate Q for the air supply model j The memory opening of the regulating valve is collected at different pressures in the supply branch and main supply lines, and the design flow rate Q of the supply model is determined. j The j-th flow rate memory opening set K consists of memory openings of the regulating valve at different pressures in the supply branch and main lines. j In step 1 of establishing, Q j Q1 = 50 Nm 3 / h, Q2 = 100Nm 3 / h, Q3 = 150Nm 3 / h Q1 (50Nm) 3 In the case of ( / h), when the pressure in the supply air branch is 0.3 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 30% (K 11) and when the pressure in the supply branch is 0.4 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 31% (K 12 ) and when the pressure in the supply branch is 0.5 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 32% (K 13 ) and when the pressure in the supply branch is 0.6 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 32% (K 14 ) and when the pressure in the supply branch is 0.7 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 34% (K 15 ) and when the pressure in the supply branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 35% (K 16 The design flow rate for the air supply model is 50 Nm³. 3 The first flow rate memory opening set K1, consisting of memory openings of the regulating valve at different supply branch pressures per hour, is K1 = {30%, 31%, 32%, 33%, 34%, 35%}. Q2 (100Nm) 3 In the case of ( / h), when the pressure in the supply air branch is 0.6 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 60% (K 21 ) and when the pressure in the supply branch is 0.7 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 61% (K 22 ) and when the pressure in the supply branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 62% (K 23 ) and when the pressure in the supply branch is 0.9 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 63% (K 24 ) and when the pressure in the supply branch is 1.0 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 64% (K 25 ) and when the pressure in the supply branch is 1.1 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 65% (K 26 ) The design flow rate for the air supply model is 100 Nm³. 3 The second flow rate memory opening set K2, consisting of memory openings of the regulating valve at different supply air branch pressures per hour, is K2 = {60%, 61%, 62%, 63%, 64%, 65%}. Q3 (150Nm) 3 In the case of ( / h), when the pressure in the supply air branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 90% (K 31 ) and when the pressure in the supply branch is 0.9 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 91% (K 32 ) and when the pressure in the supply branch is 1.0 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 92% (K 33 ) and when the pressure in the supply branch is 1.1 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 93% (K 34 ) and when the pressure in the supply branch is 1.2 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 94% (K 35 ) and when the pressure in the supply branch is 1.3 MPa and the pressure in the main line is 1.5 MPa, the memory opening of the control valve is 95% (K 35 ) The design flow rate for the air supply model is 100 Nm³. 3 The third flow rate memory opening set K3, consisting of memory openings of the regulating valve at different supply air branch pressures per hour, is K3 = {90%, 91%, 92%, 93%, 94%, 95%}. After calculation, the adjustment accuracy R1 = (Q1 - Q) corresponds to the design flow rate Q1 of the air supply model. 1′ ) / Q1=±(7.25-1.16ln(Q1)) is 2.71, and similarly R2=1.90 and R3=1.44, Step 1, Adjustment valve memory opening set K j In step 2, which establishes set K, Step 2 is that K = {K1, K2, K3}, When switching between different supply air models based on their design flow rates, first, set the design flow rate of the target supply air model to 50 Nm³. 3 Depending on the hour, set K to 50 Nm 3 Step 3 involves selecting the first flow rate memory opening set K1 corresponding to / h, Pressure P of the corresponding air supply branch 11 (0.3 MPa) and the pressure P of the main path 01(1.5 MPa) The design flow rate Q1 (50 Nm³) of the supply air model depends on the pressure. 3 The pressure P of the corresponding air supply branch line at / h 11 (0.3 MPa) and the pressure P of the main path 01 Step 4 determines the memory opening of the adjustment valve at 30% (1.5 MPa), Step 5 involves controlling the adjustment valve to adjust to a memory opening of 30%, Once the adjustment of the control valve is complete, the actual flow rate Q at this time will be complete. 1′ In step 6, when measuring Q 1′ = 49Nm 3 Step 6 is / h, Actual flow rate Q j′ (49Nm 3 Based on / h), the corresponding precision R 1′ In step 7, where R is calculated to be =0.02, 1′ The requirements are met for ≤R1, and simultaneously, the design flow rate of the supply air model is 50 Nm³. 3 The set supply period for / h(Q1) is T 01 =30s, and within the adjustment accuracy range R1, 49Nm 3 / h(Q 1′ The period of continuous stability is T1 = 10s, and the period of continuous stability t1 = T1 / T 01 The condition ×100% = 33.33% ≥ 20% is satisfied, and the actual flow rate Q at this time is Q. 1′ (49Nm 3 The / h) is in a stable state, there is no need to adjust the memory opening of the adjustment valve, there is no need to update K1 and K, the adjustment of the intake valve is complete, the adjustment time was 10s, and the adjustment accuracy is -1Nm 3 The value is / h, and the flow stability coefficient is 0.02, which is the ratio of the difference between the actual flow rate and the design flow rate to the design flow rate, and includes step 7.

[0032] Similarly, using the same procedure, when the pressure in the air supply branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q1 (50 Nm³) is calculated. 3 Adjust the ( / h) and the actual flow rate Q at this time. 1′ When measuring Q, 1′ = 51Nm 3 / h becomes the actual flow rate Q 1′ (51Nm 3Based on / h), the corresponding precision R 1′ = Calculate 0.02, R 1′ The requirements are met for ≤R1, and simultaneously, the design flow rate of the supply air model is 50 Nm³. 3 The set supply period for / h(Q1) is T 01 =30s, and Q within the adjustment accuracy range R1. 1′ (51Nm 3 The continuous stability period for ( / h) is T1 = 12s, and the continuous stability period t1 = T1 / T 01 The condition ×100% = 40% ≥ 20% is satisfied, and in this case, the actual flow rate Q 1′ (51Nm 3 The ( / h) is in a stable state, there is no need to adjust the memory opening of the adjustment valve, there is no need to update K1 and K, the adjustment of the intake valve is complete, the adjustment time was 8s, and the adjustment accuracy is 1Nm 3 The value was / h, and the flow stability coefficient was 0.02.

[0033] Similarly, using the same procedure, when the pressure in the air supply branch is 0.6 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q2 (100 Nm³) 3 Adjust the ( / h) and the actual flow rate Q at this time. 2′ When measuring Q, 2′ =99Nm 3 / h becomes the actual flow rate Q 2′ (99Nm 3 Based on / h), the corresponding precision R 2′ = Calculate 0.02, R 2′ The system satisfies ≤ R2, and simultaneously, the design flow rate of the supply air model is 100 Nm³. 3 The set supply period for / h(Q2) is T 02 =30s, and Q within the adjustment accuracy range R2. 2′ (99Nm 3 The continuous stability period for ( / h) is T2 = 8s, and the continuous stability period t2 = T2 / T 02 The condition ×100% = 26.67% ≥ 20% is satisfied, and in this case, the actual flow rate Q 2′ (99Nm 3 The ( / h) is in a stable state, there is no need to adjust the memory opening of the adjustment valve, and there is no need to update K2 and K. The adjustment of the intake valve is now complete. The adjustment time was 10s, and the adjustment accuracy is -1Nm. 3The value was / h, and the flow stability coefficient was 0.01.

[0034] Similarly, using the same procedure, when the pressure in the air supply branch is 1.1 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q2 (100 Nm³) 3 Adjust the ( / h) and the actual flow rate Q at this time. 2′ When measuring Q, 2′ = 101 Nm 3 / h becomes the actual flow rate Q 2′ (101Nm 3 Based on / h), the corresponding precision R 2′ = Calculate 0.02, R 2′ The system satisfies ≤ R2, and simultaneously, the design flow rate of the supply air model is 100 Nm³. 3 The set supply period for / h(Q2) is T 02 =30s, and Q within the adjustment accuracy range R2. 2′ (101Nm 3 The continuous stability period for ( / h) is T2 = 10s, and the continuous stability period t2 = T2 / T 02 The condition ×100% = 33.33% ≥ 20% is satisfied, and in this case, the actual flow rate Q 2′ (101Nm 3 The ( / h) is in a stable state, there is no need to adjust the memory opening of the adjustment valve, and there is no need to update K2 and K. The adjustment of the intake valve is now complete. The adjustment time was 10s, and the adjustment accuracy is 1Nm. 3 The value was / h, and the flow stability coefficient was 0.01.

[0035] Similarly, using the same procedure, when the pressure in the air supply branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q3 (150 Nm³) 3 Adjust the ( / h) and the actual flow rate Q at this time. 3′ When measuring Q, 3′ = 149Nm 3 / h becomes the actual flow rate Q 3′ (149Nm 3 Based on / h), the corresponding precision R 3′ = Calculate 0.02, R 3′ The system satisfies ≤R3, and simultaneously, the design flow rate of the supply air model is 150 Nm³. 3 / h(Q3) Set supply air period T 03 =30s, and Q within the adjustment accuracy range R3.3′ (149Nm 3 The continuous stability period for ( / h) is T3 = 11s, and the continuous stability period t3 = T3 / T 03 The condition ×100% = 36.67% ≥ 20% is satisfied, and in this case, the actual flow rate Q 3′ (149Nm 3 The ( / h) is in a stable state, there is no need to adjust the memory opening of the adjustment valve, there is no need to update K3 and K, the adjustment of the intake valve is complete, the adjustment time was 6s, and the adjustment accuracy is -1Nm 3 The value was / h, and the flow stability coefficient was 0.0067.

[0036] Similarly, using the same procedure, when the pressure in the air supply branch is 1.2 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q3 (150 Nm³) 3 Adjust the ( / h) and the actual flow rate Q at this time. 3′ When measuring Q, 3′ = 151 Nm 3 / h becomes the actual flow rate Q 3′ (151Nm 3 Based on / h), the corresponding precision R 3′ = 0.02 was calculated, R 3′ The system satisfies ≤R3, and simultaneously, the design flow rate of the supply air model is 150 Nm³. 3 / h(Q3) Set supply air period T 03 =30s, and Q within the adjustment accuracy range R3. 3′ (149Nm 3 The continuous stability period for ( / h) is T3 = 12s, and the continuous stability period t3 = T3 / T 03 The condition ×100% = 40% ≥ 20% is satisfied, and in this case, the actual flow rate Q 3′ (151Nm 3 The ( / h) is in a stable state, there is no need to adjust the memory opening of the adjustment valve, there is no need to update K3 and K, the adjustment of the intake valve is complete, the adjustment time was 9s, and the adjustment accuracy is 1Nm 3 The value was / h, and the flow stability coefficient was 0.0067.

[0037] Comparative Example In this comparative example, the flow rate of the same specific group of air supply valves as in the example is adjusted using a conventional method for adjusting air supply valves, and the steps are as follows.

[0038] According to the design flow rate set by the air supply model, the control valve is adjusted under the pressure of a specific air supply branch and main line. A flow meter detects whether the flow rate of the control valve is adjusted to the specified design flow rate. The opening of the control valve is adjusted according to the flow rate adjustment gradient, with an adjustment gradient of 5% to 10% and an adjustment accuracy range of ±3Nm. 3 It was / h.

[0039] Design flow rate Q j Q1 = 50 Nm 3 / h, and Q2 = 100Nm 3 / h, and Q3 = 150Nm 3 It was / h.

[0040] Q1 = 50 Nm 3 In the case of / h, flow rate adjustment is performed when the pressure in the supply branch is 0.3 MPa and the pressure in the main line is 1.5 MPa, and the flow meter reads when the flow rate of the adjustment valve is 45 Nm³. 3 The flow meter detected that the flow rate was / h, which is outside the required accuracy range, and the adjustment valve needs to be adjusted according to an adjustment gradient of 5%. 3 The system detected that the value was / h, which is within the required accuracy range. The adjustment is complete, the adjustment time was 40s, and the adjustment accuracy is -2.75Nm. 3 The value was / h, and the flow stability coefficient was 0.055.

[0041] Similarly, using the same procedure, when the pressure in the air supply branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q1 (50 Nm³) is calculated. 3 Adjusting the valve ( / h), the flow meter detected that the flow rate of the adjustment valve was 44 Nm³ / h, which is outside the required accuracy range. The adjustment valve needed to be adjusted according to a 5% adjustment gradient, and the flow meter detected that the flow rate of the adjustment valve was 46.2 Nm³ / h. 3 The flow meter detected that the flow rate was / h, which is outside the required accuracy range, and subsequently adjusted according to a 5% adjustment gradient. The flow meter then detected that the flow rate of the adjustment valve was 48.51 Nm³. 3The adjustment is complete once it detects that the value is / h. The adjustment time for this session was 45s, and the adjustment accuracy was -1.49Nm. 3 The value was / h, and the flow stability coefficient was 0.029.

[0042] Similarly, using the same procedure, when the pressure in the air supply branch is 0.6 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q2 (100 Nm³) 3 Adjust the flow rate ( / h), and the flow meter will show that the flow rate of the adjustment valve is 92 Nm 3 The flow meter detected that the flow rate was / h, which is outside the required accuracy range, and the adjustment valve needs to be adjusted according to a 5% adjustment gradient. 3 The system detected that the value was / h, which is within the required accuracy range. The adjustment is complete, the adjustment time was 35s, and the adjustment accuracy is -2.48Nm. 3 The value was / h, and the flow stability coefficient was 0.025.

[0043] Similarly, using the same procedure, when the pressure in the air supply branch is 1.1 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q2 (100 Nm³) 3 Adjust the flow rate ( / h), and the flow meter will adjust the flow rate of the adjustment valve to 95 Nm. 3 The flow meter detected that the flow rate of the adjustment valve was 102.6 Nm³ / h, which is outside the required accuracy range, and the adjustment valve needed to be adjusted according to an 8% adjustment gradient. 3 The system detected that the value was / h, which is within the required accuracy range. The adjustment is complete, the adjustment time was 36s, and the adjustment accuracy is 2.6Nm. 3 The value was / h, and the flow stability coefficient was 0.026.

[0044] Similarly, using the same procedure, when the pressure in the air supply branch is 0.8 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q3 (150 Nm³) 3 Adjust the flow rate ( / h), and the flow meter will show that the flow rate of the adjustment valve is 144 Nm 3 The flow meter detected that the flow rate at the adjustment valve was 152.64 Nm³ / h, which is outside the required accuracy range. Therefore, the adjustment valve needs to be adjusted according to a 6% adjustment gradient. 3The system detected that the value was / h, which is within the required accuracy range. The adjustment is complete, the adjustment time was 40s, and the adjustment accuracy is 2.64Nm. 3 The value was / h, and the flow stability coefficient was 0.018.

[0045] Similarly, using the same procedure, when the pressure in the air supply branch is 1.2 MPa and the pressure in the main line is 1.5 MPa, the flow rate Q3 (150 Nm³) 3 Adjust the flow rate ( / h), and the flow meter will adjust the flow rate of the adjustment valve to 140 Nm. 3 The flow meter detected that the flow rate of the adjustment valve was 148.4 Nm³ / h, which is outside the required accuracy range, and the adjustment valve needs to be adjusted according to a 6% adjustment gradient. 3 The system detected that the value was / h, which is within the required accuracy range. The adjustment is complete, the adjustment time was 38s, and the adjustment accuracy is -1.6Nm. 3 The value was / h, and the flow stability coefficient was 0.011.

[0046] As can be seen from the examples and comparative examples, the method of the present invention adjusts the flow rate of the air supply valve group, the flow rate adjustment time is 10s or less, and the flow rate adjustment accuracy is ±1Nm 3 The flow rate is / h, and the flow rate stability coefficient is 0.02 or less. In the conventional process, the flow rate of the air supply valve group is adjusted, the flow rate adjustment time is approximately 30-50s, and the flow rate adjustment accuracy is ±3Nm 3 The flow rate is / h, and the flow rate stability coefficient is 0.055 or less. Compared to conventional methods, the method of this invention can quickly and stably adjust and control the flow rate of the air supply valve group.

[0047] The above describes only preferred specific embodiments of the present application, but the scope of protection is not limited thereto. Any modifications or substitutions that a person skilled in the art could easily conceive within the scope of the technical scope disclosed herein are all included in the scope of protection.

Claims

1. A method for controlling the flow rate of a group of air supply valves, Design flow rate Q for the air supply model ｊ The memory opening of the regulating valve is collected at different pressures in the supply branch and main supply lines, and the design flow rate Q of the supply model is determined. ｊ The j-th flow rate memory opening set K consists of the memory openings of the adjustment valve at different pressures in the supply branch and the main line. ｊ Step 1 to establish, The j-th flow rate memory opening set K ｊ Step 2 establishes a set K consisting of the following: When switching between different air supply models, first, the design flow rate Q of the target air supply model is determined. ｊ Depending on the set, from set K to Q ｊ The j-th flow rate memory opening set K corresponding to the j-th flow rate memory opening set K ｊ Step 3 involves selecting, The pressure P of the corresponding air supply branch １ｉ and the pressure P of the main path ０ｉ According to, the designed flow rate Q of the air supply model ｊ of the corresponding air supply branch at the pressure P １ｉ and the pressure P of the main path ０ｉ The stored opening degree K of the adjustment valve at ｊｉ Step 4 of determining, and The memory opening K of the adjustment valve ｊｉ Step 5 involves controlling the adjustment to the following: Once the adjustment of the control valve is complete, the actual flow rate Q at this time will be complete. ｊ′ Step 6 to measure, The aforementioned actual flow rate Q ｊ′ Based on this, the actual flow rate adjustment accuracy R ｊ′ The supply air model calculates the actual flow rate Q. ｊ′ Determine whether the system is in a stable state, and the actual flow rate Q ｊ′ The design flow rate adjustment accuracy R ｊ Step 7 calculates the continuous stability rate within the body, The air intake model is K depending on the update conditions. ｊ A method for controlling the flow rate of a group of air supply valves, characterized by including step 8, which involves determining whether or not to update and K, and if updating is not necessary, completing the adjustment of the current air supply valve, and if updating is necessary, completing the adjustment of the current air supply valve after the update is completed.

2. Step 1 is, Design flow rate Q of the aforementioned air supply model ｊ The pressure P in the air supply branch line. １ｉ and the pressure P of the main passage ０ｉ Memory opening K of the adjustment valve ｊｉ Collect the data, where i = 1, 2, 3...n and j = 1, 2, 3...m, step, Design flow rate Q of the aforementioned air supply model ｊ The pressure P in the air supply branch line. １ｉ and the pressure P of the main passage ０ｉ The memory opening set K of the adjustment valve. ｊｉ The j-th flow rate memory opening set K is composed of the above. ｊ Establish K ｊ = {K ｊ１ _K ｊ２ , . . , K ｊｉ , . . , K ｊｎ A method for controlling the flow rate of an air supply valve group according to claim 1, characterized by including a step where i = 1, 2, 3...n and j = 1, 2, 3...m.

3. Design flow rate Q of the aforementioned air supply model ｊ The pressure P in the air supply branch line. １ｉ and the pressure P of the main passage ０ｉ The memory opening degree K of the adjustment valve ｊｉ ga t ｊ This is the opening degree of the adjustment valve when ≥ 20%, where t ｊ The flow rate adjustment control method for a group of air supply valves according to claim 2, characterized in that the actual flow rate is a continuous stability rate within the design flow rate adjustment accuracy range.

4. Said t ｊ = T ｊ / T ０ｊ It is ×100%, Here, T ｊ This is the continuous stabilization period s of the actual flow rate within the design flow rate adjustment accuracy range. T ０ｊ The flow rate adjustment control method for a group of air supply valves according to claim 3, characterized in that s is the set air supply period s of the design flow rate of the air supply model.

5. The design flow rate adjustment accuracy R ｊ =±(7.25-1.16ln(Q ｊ )) and Here, R ｊ This is the design flow rate adjustment accuracy, Q ｊ The design flow rate Nm of the aforementioned air supply model is ３ A method for controlling the flow rate of an air supply valve group according to claim 4, characterized in that it is / h.

6. In step 7, the air supply model is the actual flow rate Q ｊ′ Determining whether or not it is in a stable state is The aforementioned actual flow rate adjustment accuracy R ｊ′ The design flow rate adjustment accuracy R ｊ In the following cases, the actual flow rate Q ｊ′ It was determined that it was in a stable state. The aforementioned actual flow rate adjustment accuracy R ｊ′ The design flow rate adjustment accuracy R ｊ If it is greater than the actual flow rate Q, ｊ′ The method for controlling the flow rate of an air supply valve group according to claim 5, characterized in that it includes determining that the valves are in an unstable state.

7. The actual flow rate adjustment accuracy is R ｊ′ = | (Q ｊ - Q ｊ′ ) / Q ｊ The method for controlling the flow rate of a group of air supply valves according to claim 6, characterized in that |

8. The update conditions include the following: the air supply model has the actual flow rate adjustment accuracy R ｊ′ The design flow rate adjustment accuracy R ｊ Whether or not it falls within the range, and the design flow rate adjustment accuracy R of the actual flow rate. ｊ Continuous stability rate t within the range ｊ Determine whether it is 20% or more. The aforementioned actual flow rate adjustment accuracy R ｊ′ The design flow rate adjustment accuracy R ｊ The following applies, and the design flow rate adjustment accuracy R of the actual flow rate. ｊ The continuous stability rate t within the range ｊ If it is 20% or more, the actual flow rate Q ｊ′ It is in a stable state, K ｊ The method for controlling the flow rate of a group of air supply valves according to claim 7, characterized in that the flow rate adjustment of the air supply valves is completed without updating K.

9. The update conditions further include the following: the actual flow rate adjustment accuracy R ｊ′ The design flow rate adjustment accuracy R ｊ The following is the actual flow rate, and the design flow rate adjustment accuracy R ｊ Continuous stability rate t within the range ｊ If it is less than 20%, the actual flow rate Q ｊ′ The system is in an unstable state, and the air supply model automatically controls the opening of the adjustment valve to adjust the actual flow rate, and the design flow rate adjustment accuracy R ｊ The continuous stability rate t within the range ｊ Set it to 20% or more, record the opening degree of the adjustment valve, K ｊ The method for controlling the flow rate of a group of air supply valves according to claim 8, characterized in that K is updated and the flow rate adjustment of the air supply valve is completed.

10. The update conditions further include the following: the actual flow rate adjustment accuracy R ｊ′ The design flow rate adjustment accuracy R ｊ Larger than the actual flow rate, and with respect to the design flow rate adjustment accuracy R ｊ The continuous stability rate t within the range ｊ If it is less than 20%, the actual flow rate Q ｊ′ The system is in an unstable state, and the air supply model automatically controls the opening of the adjustment valve to adjust the actual flow rate, with the design flow rate adjustment accuracy R ｊ The continuous stability rate t within the range ｊ Set it to 20% or more, record the opening degree of the adjustment valve, K ｊ The method for controlling the flow rate of a group of air supply valves according to claim 9, characterized in that the flow rate adjustment of the air supply valves is completed by updating and K.

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