A method for regulating and controlling the flow of a gas valve group

Abstract

The present invention relates to a flow control method for a gas supply valve group, which belongs to the field of steel metallurgy technology and solves the problems of slow speed and low precision of the existing gas supply model flow control method. The method comprises: collecting the gas supply model design flow under different gas supply branch pressures and main line pressures to determine the memory opening of the regulating valve, and establishing a gas supply model design flow memory opening set K. j ; Founded by K j The set K is composed of; according to the design flow of the gas supply model to be switched, select Q in the set K j The corresponding j-th flow memory opening set K j ; According to the air supply branch pressure and the main line pressure, determine the memory opening K of the regulating valve of the air supply model design flow ji ; Control the regulating valve to the memory opening K ji Adjustment; After adjustment, measure the actual flow, calculate the actual flow accuracy, determine whether the actual flow is in a stable state, calculate the continuous stability rate; determine whether K is correct according to the update conditions j and K. This method has fast adjustment speed and high precision.

Description

Technical Field

[0001] The present invention relates to the technical field of iron and steel metallurgy, and in particular to a flow regulation and control method for an air supply valve group. Background Art

[0002] During the steel converter smelting process, blowing gas from the bottom of the converter into the high-temperature molten pool can effectively improve the stirring of the molten metal, promote the slag-steel reaction, and further promote the uniformity of the molten metal composition and temperature, thereby improving the converter smelting quality and efficiency. According to the production and smelting characteristics of the converter, the converter bottom blowing gas supply is an intermittent cyclic gas supply, and in each cycle, different bottom blowing gas flow rates are adjusted according to the different characteristics of different stages of converter smelting.

[0003] To meet the needs of converter smelting process control, flow rates must be adjusted quickly and accurately during different smelting stages to meet the flow adjustment requirements of the converter during different smelting stages. Existing bottom-blowing gas supply models often set flow rates based on the model, with system control valves or flow control devices automatically adjusting the flow rate. This method's adjustment speed and accuracy depend primarily on the characteristics of the control valves or flow control devices, and each flow adjustment requires extensive adjustments to the relevant devices. This not only slows down the adjustment process, but the frequent adjustments also affect the stability and accuracy of the relevant equipment. Summary of the Invention

[0004] In view of the above analysis, an embodiment of the present invention aims to provide a flow regulation control method for a gas supply valve group, so as to solve the problems of slow adjustment speed and low adjustment accuracy of the flow regulation method of the gas supply model in the existing converter smelting process.

[0005] The purpose of the present invention is mainly achieved through the following technical solutions:

[0006] A flow regulation control method for a gas supply valve group comprises the following steps:

[0007] Step 1: Collect the air supply model design flow Q j The regulating valve memory opening under different air supply branch pressures and main line pressures is used to establish the air supply model design flow rate Q j The jth flow memory opening set K is composed of the memory opening of the regulating valve under different gas supply branch pressures and main pressures. j ;

[0008] Step 2: Create a memory opening set K based on the j-th flow j The set K composed of

[0009] Step 3: When the air supply model switches to a different design flow rate, first design the flow rate Q according to the air supply model to be switched to. j , select Q from the set K j The corresponding j-th flow memory opening set Kj ;

[0010] Step 4: According to the corresponding gas supply branch pressure P 1i With the main pressure P 0i , determine the air supply model design flow Q j At the corresponding gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji ;

[0011] Step 5: Control the regulating valve to the memory opening K ji adjust;

[0012] Step 6: After the regulating valve is adjusted, measure the actual flow rate Q at this time j′ ;

[0013] Step 7: According to the actual flow Q j′ , calculate the actual flow accuracy R j′ , the gas supply model determines the actual flow rate Q j′ Is it in a stable state and calculate the actual flow rate Q j′ In the design flow regulation accuracy range R j Continuous stability rate within

[0014] Step 8: The air supply model determines whether to update K according to the update conditions. j and K are updated. If no update is required, the air supply valve adjustment is completed. If update is required, the air supply valve adjustment is completed after the update is completed.

[0015] Furthermore, the step 1 includes:

[0016] Collect the design flow rate Q of the air supply model j In the gas supply branch pressure P 1i With the main pressure P 0i Memory opening K ji , where i = 1, 2, 3 ... n, j = 1, 2, 3 ... m;

[0017] Establish the air supply model and design the flow rate Q j In the gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji The j-th flow memory opening set K j , K j ={K j1 , K j2 , ..., K ji , ..., K jn}, where i = 1, 2, 3…n, j = 1, 2, 3…m.

[0018] Furthermore, the air supply model designs a flow rate Q j In the gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji t j ≥20% when the regulating valve opening, where t j It is the continuous stability rate of the actual flow within the designed adjustment accuracy range.

[0019] Furthermore, the t j =T j / T 0j ×100%,

[0020] Among them, T j is the continuous stable time of actual flow within the design regulation accuracy range, s;

[0021] T 0j Set the air supply time for the air supply model design flow, s.

[0022] Furthermore, the designed flow regulation accuracy R j = ±(7.25-1.16ln(Q j )),

[0023] Among them, R j To design flow regulation accuracy;

[0024] Q j Design flow rate for air supply model, Nm 3 / h.

[0025] Furthermore, in step 7, the gas supply model determines the actual flow rate Q j′ Whether it is in a stable state includes:

[0026] Actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , then the actual flow rate Q j′ in a stable state;

[0027] Actual flow regulation accuracy R j′ >Design flow regulation accuracy R j , then the actual flow rate Q j′ In an unstable state.

[0028] Furthermore, the actual flow rate adjustment accuracy R j′ =|(Q j -Q j′ ) / Q j |.

[0029] Furthermore, the update condition includes: the air supply model determines the actual flow regulation accuracy R j′ Is the flow regulation accuracy R in the design? j The actual flow rate is within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%;

[0030] If the actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , and the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j ≥20%, then the actual flow rate Q j′ In a stable state, K j and K are updated, and the flow adjustment of the air supply valve is completed.

[0031] Furthermore, the update condition also includes: actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j <20%, ​​then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%, record the opening of the regulating valve, for K j and K are updated, and the flow adjustment of the air supply valve is completed.

[0032] Furthermore, the update condition also includes: actual flow regulation accuracy R j′ >Design flow regulation accuracy R j , and the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j <20%, ​​then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%, record the opening of the regulating valve, for K j and K are updated, and the flow adjustment of the air supply valve is completed.

[0033] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0034] 1. The method of the present invention establishes a set of memory openings of regulating valves at different design flows under different branch pressures and main pressures in the air supply model. When the corresponding flow is subsequently adjusted, the regulating valves in the air supply valve group can be quickly adjusted to the corresponding openings according to the data in the memory opening set of regulating valves. The flow adjustment speed of the regulating valve is ≤10s, and the flow adjustment accuracy range is ±1Nm 3 / h, flow stability coefficient ≤0.02; compared with the existing technology, the flow regulation speed is faster and the accuracy is improved.

[0035] 2. The method of the present invention establishes a set of memory openings of the regulating valves for different design flows under different branch pressures and main pressures in the air supply model, and updates the set of memory openings of the regulating valves according to the adjustment results when performing corresponding flow adjustments subsequently, thereby ensuring the accuracy of the air supply model in adjusting the air supply valve group.

[0036] In the present invention, the above-mentioned technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of the present invention will be described in the following description, and some advantages will become apparent from the description or be learned through practice of the present invention. The objectives and other advantages of the present invention can be realized and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered limiting of the present invention. Like reference symbols denote like parts throughout the drawings.

[0038] Figure 1 This is a flow chart of the flow regulation control method of the gas supply valve group of the present invention. DETAILED DESCRIPTION

[0039] The preferred embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, and are not used to limit the scope of the present invention.

[0040] The present invention provides a flow regulation control method for a gas supply valve group, comprising the following steps:

[0041] Step 1: Collect the air supply model design flow Q j The regulating valve memory opening under different air supply branch pressures and main line pressures is used to establish the air supply model design flow rate Q j The jth flow memory opening set K is composed of the memory opening of the regulating valve under different gas supply branch pressures and main pressures. j ;

[0042] Step 2: Create a memory opening set K based on the j-th flowj The set K composed of

[0043] Step 3: When the air supply model switches to a different design flow rate, first design the flow rate Q according to the air supply model to be switched to. j , select Q from the set K j The corresponding j-th flow memory opening set K j ;

[0044] Step 4: According to the corresponding gas supply branch pressure P 1i With the main pressure P 0i , determine the air supply model design flow Q j At the corresponding gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji ;

[0045] Step 5: Control the regulating valve to the memory opening K ji adjust;

[0046] Step 6: After the regulating valve is adjusted, measure the actual flow rate Q at this time j′ ;

[0047] Step 7: According to the actual flow Q j′ , calculate the actual flow accuracy R j′ , the gas supply model determines the actual flow rate Q j′ Is it in a stable state and calculate the actual flow rate Q j′ In the design flow regulation accuracy range R j Continuous stability rate within

[0048] Step 8: The air supply model determines whether to update K according to the update conditions. j and K are updated. If no update is required, the air supply valve adjustment is completed. If update is required, the air supply valve adjustment is completed after the update is completed.

[0049] During the smelting process of the steel converter, the flow rate is adjusted through the gas supply model. Most existing gas supply models set the flow rate according to the model, and the system regulating valve or flow regulating device automatically adjusts the flow rate. The adjustment speed and accuracy of this method mainly depend on the inherent characteristics of the regulating valve or flow regulating device, and a large range of adjustments of the relevant devices are required during each flow adjustment process, resulting in slow adjustment speed and low accuracy. The method of the present invention establishes a set of regulating valve memory openings for different design flows under different gas supply branch pressures and main line pressures in the gas supply model. When the corresponding flow rate is subsequently adjusted, the gas supply valve group can be quickly adjusted to the corresponding opening according to the data in the regulating valve memory opening set. The flow adjustment speed is ≤10s, and the flow adjustment accuracy range is ±1Nm. 3 / h, flow stability coefficient ≤0.02; compared with the existing technology, the flow regulation speed is faster and the accuracy is improved.

[0050] Specifically, in step 1, first collect the air supply model design flow Q1 at the air supply branch pressure P 1i With the main pressure P 0i Memory opening K 1i (i=1, 2, 3...n);

[0051] The memory opening K 1i The opening of the regulating valve when t1≥20%, where t1 is the actual flow Q 1′ The continuous stability rate within the designed flow regulation accuracy range R1, the t1 = T1 / T 01 ×100%, where T1 is the designed flow regulation accuracy within R1 Q 1′ The continuous stable duration, T 01 Set the air supply duration for the air supply model design flow Q1;

[0052] Among them, R1=±(7.25-1.16ln(Q1)), the actual flow regulation accuracy R 1′ =|(Q1-Q 1′ ) / Q1|, if the actual flow regulation accuracy R 1′ ≤R1, then R 1′ Within the designed flow regulation accuracy range R1, the actual flow Q 1′ In a stable state; if the actual flow adjustment accuracy R 1′ >R1, it means R 1′ Not within the design flow regulation accuracy range R1, the actual flow Q 1′ In an unstable state.

[0053] For example, the model design flow Q1 is at the air supply branch pressure P 11 With the main pressure P 01 Memory opening K 11 , the model design flow Q1 at the gas supply branch pressure P 12 With the main pressure P 02 Memory opening K 12 , the model design flow Q1 at the gas supply branch pressure P 13 With the main pressure P 03 Memory opening K 13 , the model design flow Q1 at the gas supply branch pressure P 1i With the main pressure P 0i Memory opening K 1i , the model design flow Q1 at the gas supply branch pressure P 1n With the main pressure P 0n Memory opening K1n , establish the gas supply model design flow Q1 under different gas supply branch pressure and main pressure of the regulating valve memory opening K 1i (i=1,2,3…n) composed of the first flow memory opening set K1, K1={K 11 , K 12 , ..., K 1i , ..., K 1n}.

[0054] Similarly, the design flow rate Q2 of the air supply model is collected at the air supply branch pressure P 1i With the main pressure P 0i Memory opening K 2i (i=1,2,3…n), establish the air supply model design flow Q2 and the regulating valve memory opening K under different air supply branch pressure and main line pressure 2i (i=1,2,3…n) composed of the second flow memory opening set K2, K2={K 21 , K 22 , ..., K 2i , ..., K 2n}. Collection model design flow Q j In the gas supply branch pressure P 1i With the main pressure P 0i Memory opening K ji (i=1,2,3…n;j=1,2,3…m), establish the air supply model design flow rate Q j The memory opening K of the regulating valve under different gas supply branch pressures and main pressures ji The j-th flow memory opening set K composed of (i=1,2,3…n) j , K j ={K j1 , K j2 , ..., K ji , ..., K jn}.

[0055] Accordingly, K ji That is t j ≥20% when the regulating valve opening, where t j is the actual flow rate Q j′ In the design flow regulation accuracy range R j The continuous stability rate within the t j =T j / T 0j × 100%, where T j Design flow regulation accuracy range R j Inner Q j′ The continuous stable duration, T 0j Design flow rate Q for the air supply modelj Set gas supply time;

[0056] Among them, R j = ±(7.25-1.16ln(Q j )), actual flow regulation accuracy R j′ =|(Q j -Q j′ ) / Q j If the actual flow rate adjustment accuracy R j′ ≤R j , which means R j′ In the design flow regulation accuracy range R j Internal, actual flow Q j′ In a stable state; if the actual flow adjustment accuracy R j′ >R j , which means R j′ Not within the design flow regulation accuracy range R j Internal, actual flow Q j′ In an unstable state.

[0057] In step 2, establish the j-th flow memory opening set K j The set K is composed of the memory opening set of the regulating valve at different branch pressures and main pressures for each design flow in the air supply model, K = {K1, K2, ..., K j , ..., K m}.

[0058] Specifically, in step 8, the update condition is: the air supply model determines the actual flow regulation accuracy R j′ Is the flow regulation accuracy R in the design? j The actual flow rate is within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%;

[0059] If the actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , and the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j ≥20%, then the actual flow rate Q j′ In a stable state, K j and K are updated, and the flow adjustment of the air supply valve is completed.

[0060] If the actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range tj <20%, ​​then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%, record the opening of the regulating valve, for K j and K are updated, and the flow adjustment of the air supply valve is completed.

[0061] If the actual flow regulation accuracy R j′ >Design flow regulation accuracy R j , and the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j <20%, ​​then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%, record the opening of the regulating valve, for K j and K are updated, and the flow adjustment of the air supply valve is completed.

[0062] The method of the present invention establishes a set of memory openings of regulating valves at different design flow rates under different supply branch pressures and main line pressures in the air supply model. When performing corresponding flow adjustment subsequently, the air supply valve group can be quickly adjusted to the corresponding opening according to the data in the memory opening set of regulating valves. The adjustment speed is fast and the accuracy is high. The set of memory openings of regulating valves can be updated according to the adjustment results, thereby ensuring the accuracy of the flow adjustment of the air supply valve group by the air supply model.

[0063] Example

[0064] This embodiment adjusts the flow of a gas supply valve group, including the following steps:

[0065] Step 1: Collect the air supply model design flow Q j The regulating valve memory opening under different air supply branch pressures and main line pressures is used to establish the air supply model design flow rate Q j The jth flow memory opening set K is composed of the memory opening of the regulating valve under different gas supply branch pressures and main pressures. j ;

[0066] Among them, Q j Q1 = 50Nm 3 / h, Q2=100Nm 3 / h, Q3=150Nm 3 / h;

[0067] Q1(50Nm3 / h) The memory opening of the regulating valve at the air supply branch pressure of 0.3MPa and the main pressure of 1.5MPa is 30% (K 11 ), the memory opening of the regulating valve under the pressure of 0.4MPa of the gas supply branch and 1.5MPa of the main line is 31% (K 12 ), the memory opening of the regulating valve under the pressure of 0.5MPa of the gas supply branch and 1.5MPa of the main line is 32% (K 13 ), the memory opening of the regulating valve under the pressure of 0.6MPa of the gas supply branch and 1.5MPa of the main line is 33% (K 14 ), the memory opening of the regulating valve under the pressure of 0.7MPa of the gas supply branch and 1.5MPa of the main line is 34% (K 15 ), the memory opening of the regulating valve under the pressure of 0.8MPa of the gas supply branch and 1.5MPa of the main line is 35% (K 16 ); air supply model design flow rate 50Nm 3 / h. A first flow memory opening set K1 composed of the memory openings of the regulating valve at different supply branch pressures, K1 = {30%, 31%, 32%, 33%, 34%, 35%};

[0068] Q2(100Nm 3 / h) The memory opening of the regulating valve at the air supply branch pressure of 0.6MPa and the main pressure of 1.5MPa is 60% (K 21 ), the memory opening of the regulating valve under the pressure of 0.7MPa of the gas supply branch and 1.5MPa of the main line is 61% (K 22 ), the memory opening of the regulating valve under the pressure of 0.8MPa of the gas supply branch and 1.5MPa of the main line is 62% (K 23 ), the memory opening of the regulating valve under the air supply branch pressure of 0.9MPa and the main pressure of 1.5MPa is 63% (K 24 ), the memory opening of the regulating valve under the pressure of 1.0MPa of the gas supply branch and 1.5MPa of the main line is 64% (K 25 ), the memory opening of the regulating valve at the air supply branch pressure of 1.1MPa and the main pressure of 1.5MPa is 65% (K 26 ); air supply model design flow rate 100Nm 3 / h. A second flow memory opening set K2 composed of the memory openings of the regulating valve at different supply branch pressures, K2 = {60%, 61%, 62%, 63%, 64%, 65%};

[0069] Q3(150Nm 3 / h) The memory opening of the regulating valve at the air supply branch pressure of 0.8MPa and the main pressure of 1.5MPa is 90% (K 31), the memory opening of the regulating valve under the pressure of 0.9MPa of the gas supply branch and 1.5MPa of the main line is 91% (K 32 ), the memory opening of the regulating valve under the pressure of 1.0MPa of the gas supply branch and 1.5MPa of the main line is 92% (K 33 ), the memory opening of the regulating valve under the pressure of 1.1MPa of the gas supply branch and 1.5MPa of the main line is 93% (K 34 ), the memory opening of the regulating valve under the pressure of 1.2MPa of the gas supply branch and 1.5MPa of the main line is 94% (K 35 ), the memory opening of the regulating valve at the air supply branch pressure of 1.3MPa and the main pressure of 1.5MPa is 95% (K 35 ); air supply model design flow rate 100Nm 3 / h. A third flow memory opening set K3 composed of the memory openings of the regulating valve at different supply branch pressures, K3 = {90%, 91%, 92%, 93%, 94%, 95%};

[0070] After calculation, the regulation accuracy R1 corresponding to the design flow rate Q1 of the air supply model is R1 = (Q1-Q 1′ ) / Q1=±(7.25-1.16ln(Q1)), which is 2.71; similarly, R2=1.90, R3=1.44;

[0071] Step 2: Create a control valve memory opening set K j The set K of

[0072] K = {K1, K2, K3};

[0073] Step 3: When the air supply model switches to a different design flow rate, first design the flow rate 50Nm according to the air supply model to be switched to. 3 / h, select 50Nm from the set K 3 / The first flow memory opening set K1 corresponding to h;

[0074] Step 4: According to the corresponding gas supply branch pressure P 11 (0.3MPa) and the main line pressure P 01 (1.5MPa), determine the air supply model design flow rate Q1 (50Nm 3 / h) At the corresponding gas supply branch pressure P 11 (0.3MPa) and the main line pressure P 01 (1.5MPa) The regulating valve memory opening is 30%;

[0075] Step 5: Control the regulating valve to adjust to the memory opening of 30%;

[0076] Step 6: After the regulating valve is adjusted, measure the actual flow rate Q at this time1′ , Q 1′ =49Nm 3 / h;

[0077] Step 7: According to the actual flow Q 1′ (49Nm 3 / h), calculate the corresponding accuracy R 1′ =0.02, satisfying R 1′ ≤R1, at the same time, the air supply model design flow rate is 50Nm 3 / h(Q1) set gas supply time T 01 =30s, adjustment accuracy range R1 within 49Nm 3 / h(Q 1′ ) continuous stable time T1 = 10s, satisfying the continuous stable time t1 = T1 / T 01 ×100%=33.33%≥20%, the actual flow rate Q at this time 1′ (49Nm 3 / h) In a stable state, there is no need to adjust the memory opening of the regulating valve, and there is no need to update K1 and K. The air supply valve adjustment is completed; the adjustment time is 10s, and the adjustment accuracy is -1Nm 3 / h, the flow stability coefficient is 0.02, which is the ratio of the difference between the actual flow and the design flow to the design flow.

[0078] Similarly, follow the same steps to Q1 (50Nm 3 / h) Adjust the flow rate at a branch pressure of 0.8 MPa and a main pressure of 1.5 MPa, and measure the actual flow rate Q at this time 1′ , Q 1′ =51Nm 3 / h; according to the actual flow Q 1′ (51Nm 3 / h), calculate the corresponding accuracy R 1′ =0.02, satisfying R 1′ ≤R1, at the same time, the air supply model design flow rate is 50Nm 3 / h(Q1) set gas supply time T 01 =30s, adjustment accuracy range R1 within Q 1′ (51Nm 3 / h) The continuous stable time T1 = 12s, which satisfies the continuous stable time t1 = T1 / T 01 ×100%=40%≥20%, the actual flow rate at this time is Q 1′ (51Nm 3 / h) In a stable state, there is no need to adjust the memory opening of the regulating valve, and there is no need to update K1 and K. The air supply valve adjustment is completed; the adjustment time is 8s, and the adjustment accuracy is 1Nm 3 / h, and the flow stability coefficient is 0.02.

[0079] Similarly, follow the same steps to Q2 (100Nm 3 / h) Adjust the flow rate at a branch pressure of 0.6 MPa and a main pressure of 1.5 MPa, and measure the actual flow rate Q at this time 2′ , Q 2′ =99Nm 3 / h; according to the actual flow Q 2′ (99Nm 3 / h), calculate the corresponding accuracy R 2′ =0.02, satisfying R 2′ ≤R2, at the same time, the air supply model design flow rate is 100Nm 3 / h(Q2) set gas supply time T 02 =30s, adjustment accuracy range R2 within Q 2′ (99Nm 3 / h) The continuous stable time length T2 = 8s, which satisfies the continuous stable time length t2 = T2 / T 02 ×100%=26.67%≥20%, the actual flow rate Q at this time 2′ (99Nm 3 / h) In a stable state, there is no need to adjust the memory opening of the regulating valve, and there is no need to update K2 and K. The air supply valve adjustment is completed; the adjustment time is 10s, and the adjustment accuracy is -1Nm 3 / h, flow stability coefficient 0.01.

[0080] Similarly, follow the same steps to Q2 (100Nm 3 / h) Adjust the flow rate at a branch pressure of 1.1 MPa and a main pressure of 1.5 MPa, and measure the actual flow rate Q at this time 2′ , Q 2′ =101Nm 3 / h; according to the actual flow Q 2′ (101Nm 3 / h), calculate the corresponding accuracy R 2′ =0.02, satisfying R 2′ ≤R2, at the same time, the air supply model design flow rate is 100Nm 3 / h(Q2) set gas supply time T 02 =30s, adjustment accuracy range R2 within Q 2′ (101Nm 3 / h) The continuous stable time T2 = 10s, satisfying the continuous stable time t2 = T2 / T 02 ×100%=33.33%≥20%, the actual flow rate Q at this time 2′ (101Nm 3 / h) In a stable state, there is no need to adjust the memory opening of the regulating valve, and there is no need to update K2 and K. The air supply valve adjustment is completed; the adjustment time is 10s, and the adjustment accuracy is 1Nm 3 / h, flow stability coefficient 0.01.

[0081] Similarly, follow the same steps to Q3 (150Nm 3 / h) Adjust the flow rate at a branch pressure of 0.8 MPa and a main pressure of 1.5 MPa, and measure the actual flow rate Q at this time 3′ , Q 3′ =149Nm 3 / h; according to the actual flow Q 3′ (149Nm 3 / h), calculate the corresponding accuracy R 3′ =0.02, satisfying R 3′ ≤R3, at the same time, the air supply model design flow rate is 150Nm 3 / h(Q3) set gas supply time T 03 =30s, adjustment accuracy within R3 Q 3′ (149Nm 3 / h) The continuous stable time T3 = 11s, which satisfies the continuous stable time t3 = T3 / T 03 ×100%=36.67%≥20%, the actual flow rate Q at this time 3′ (149Nm 3 / h) In a stable state, there is no need to adjust the memory opening of the regulating valve, and there is no need to update K3 and K. The air supply valve adjustment is completed; the adjustment time is 6s, and the adjustment accuracy is -1Nm 3 / h, flow stability coefficient 0.0067.

[0082] Similarly, follow the same steps to Q3 (150Nm 3 / h) Adjust the flow rate at a branch pressure of 1.2 MPa and a main pressure of 1.5 MPa, and measure the actual flow rate Q at this time 3′ , Q 3′ =151Nm 3 / h; according to the actual flow Q 3′ (151Nm 3 / h), calculate the corresponding accuracy R 3′ =0.02, satisfying R 3′ ≤R3, at the same time, the air supply model design flow rate is 150Nm 3 / h(Q3) set gas supply time T 03 =30s, adjustment accuracy within R3 Q 3′ (149Nm 3 / h) The continuous stable time T3 = 12s, which satisfies the continuous stable time t3 = T3 / T 03 ×100%=40%≥20%, the actual flow rate at this time is Q 3′ (151Nm 3 / h) In a stable state, there is no need to adjust the memory opening of the regulating valve, and there is no need to update K3 and K. The air supply valve adjustment is completed; the adjustment time is 9s and the adjustment accuracy is 1Nm 3 / h, and the flow stability coefficient is 0.0067.

[0083] Comparative Example

[0084] In this comparative example, the flow rate of a gas supply valve group identical to that in the embodiment is adjusted using the existing gas supply valve group adjustment method, and the steps are as follows:

[0085] According to the design flow set by the air supply model, under certain air supply branch pressure and main line pressure, adjust the regulating valve, and use the flow meter to detect whether the flow of the regulating valve is adjusted to the specified design flow; adjust the opening of the regulating valve according to the flow adjustment gradient, the adjustment gradient is 5%-10%, and the adjustment accuracy range is ±3Nm 3 / h.

[0086] Among them, the design flow rate is Q j Q1 = 50 Nm 3 / h, Q2=100Nm 3 / h, Q3=150Nm 3 / h;

[0087] Q1=50Nm 3 / h, flow regulation is performed under the pressure of 0.3MPa of the gas supply branch and 1.5MPa of the main line. The flow meter detects the flow of the regulating valve and it is 45Nm 3 / h, is not within the required accuracy range, the regulating valve should be adjusted according to the adjustment gradient, the adjustment gradient is 5%, the flow meter detects the regulating valve flow rate is 47.25Nm 3 / h, within the required accuracy range, the adjustment is completed. The adjustment time is 40s and the adjustment accuracy is -2.75Nm 3 / h, and the flow stability coefficient is 0.055.

[0088] Similarly, follow the same steps to Q1 (50Nm 3 / h) Flow regulation is performed under the pressure of the air supply branch line of 0.8MPa and the main line pressure of 1.5MPa. The flow meter detects the flow of the regulating valve and it is 44Nm 3 / h, is not within the required accuracy range, the regulating valve should be adjusted according to the adjustment gradient, the adjustment gradient is 5%, the flow meter detects the regulating valve flow rate is 46.2Nm 3 / h, it is not within the required accuracy range, and the adjustment is continued according to the adjustment gradient of 5%. The flow meter detects that the flow rate of the regulating valve is 48.51Nm 3 / h, the adjustment is completed. The adjustment time is 45s and the adjustment accuracy is -1.49Nm 3 / h, and the flow stability coefficient is 0.029.

[0089] Similarly, follow the same steps to Q2 (100Nm 3 / h) Flow regulation is performed under the pressure of the air supply branch line of 0.6MPa and the main line pressure of 1.5MPa. The flow meter detects the flow of the regulating valve and it is 92Nm 3 / h, is not within the required accuracy range, the regulating valve should be adjusted according to the adjustment gradient, the adjustment gradient is 5%, the flow meter detects the regulating valve flow rate is 97.52Nm 3 / h, within the required accuracy range, the adjustment is completed. The adjustment time is 35s and the adjustment accuracy is -2.48Nm 3 / h, and the flow stability coefficient is 0.025.

[0090] Similarly, follow the same steps to Q2 (100Nm 3 / h) Flow regulation is performed under the pressure of 1.1MPa on the air supply branch and 1.5MPa on the main line. The flow meter detects that the flow rate of the regulating valve is 95Nm 3 / h, is not within the required accuracy range, the regulating valve should be adjusted according to the regulating gradient, the regulating gradient is 8%, the flow meter detects the regulating valve flow rate is 102.6Nm 3 / h, within the required accuracy range, the adjustment is completed, the adjustment time is 36s, and the adjustment accuracy is 2.6Nm 3 / h, and the flow stability coefficient is 0.026.

[0091] Similarly, follow the same steps to Q3 (150Nm 3 / h) Flow regulation is performed under the conditions of 0.8 MPa pressure on the gas supply branch and 1.5 MPa on the main line. The flow meter detects that the flow rate of the regulating valve is 144 Nm 3 / h, is not within the required accuracy range, the regulating valve should be adjusted according to the regulating gradient, the regulating gradient is 6%, the flow meter detects the regulating valve flow rate is 152.64Nm 3 / h, within the required accuracy range, the adjustment is completed. The adjustment time is 40s and the adjustment accuracy is 2.64Nm 3 / h, and the flow stability coefficient is 0.018.

[0092] Similarly, follow the same steps to Q3 (150Nm 3 / h) Flow regulation is performed under the pressure of 1.2MPa on the air supply branch and 1.5MPa on the main line. The flow meter detects that the flow rate of the regulating valve is 140Nm 3 / h, is not within the required accuracy range, the regulating valve should be adjusted according to the regulating gradient, the regulating gradient is 6%, the flow meter detects the regulating valve flow rate is 148.4Nm 3 / h, within the required accuracy range, the adjustment is completed. The adjustment time is 38s and the adjustment accuracy is -1.6Nm 3 / h, and the flow stability coefficient is 0.011.

[0093] From the embodiment and the comparative example, it can be seen that the method of the present invention adjusts the flow of the gas supply valve group, the flow adjustment time is ≤10s, and the flow adjustment accuracy is ±1Nm 3 / h, flow stability coefficient ≤0.02; the existing process adjusts the flow of the gas supply valve group, the flow adjustment time is about 30-50s, and the flow adjustment accuracy is ±3Nm 3 / h, flow stability coefficient ≤0.055%; compared with the existing method, the method of the present invention can achieve rapid and stable regulation and control of the flow of the gas supply valve group.

[0094] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed by the present invention should be covered by the scope of protection of the present invention.

Claims

1. A flow control method for a gas supply valve group, characterized in that: The following steps are involved: Step 1: Collect the air supply model design flow Q j The regulating valve memory opening under different air supply branch pressures and main line pressures is used to establish the air supply model design flow rate Q j The jth flow memory opening set K is composed of the memory opening of the regulating valve under different gas supply branch pressures and main pressures. j ; Step 2: Create a memory opening set K based on the j-th flow j The set K composed of Step 3: When the air supply model switches to a different design flow rate, first design the flow rate Q according to the air supply model to be switched to. j , select Q from the set K j The corresponding j-th flow memory opening set K j ; Step 4: According to the corresponding gas supply branch pressure P 1i With the main pressure P 0i , determine the air supply model design flow Q j At the corresponding gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji ; Step 5: Control the regulating valve to the memory opening K ji adjust; Step 6: After the regulating valve is adjusted, measure the actual flow rate Q at this time j′ ; Step 7: According to the actual flow Q j′ , calculate the actual flow accuracy R j′ , the gas supply model determines the actual flow rate Q j′ Is it in a stable state and calculate the actual flow rate Q j′ In the design flow regulation accuracy R j Continuous stability rate within the range; Step 8: The air supply model determines whether to update K according to the update conditions. j and K are updated. If no update is required, the air supply valve adjustment is completed. If update is required, the air supply valve adjustment is completed after the update is completed. In step 7, the actual flow rate Q j′ In the design flow regulation accuracy R j The continuous stability rate within the range is t j , t j =T j / T 0j ×100%, where T j The design flow regulation accuracy R j The continuous stable duration of actual flow within the range, s; T 0j Set the air supply time for the air supply model design flow, s; Design flow regulation accuracy R j = ± (7.25-1.16ln (Q j )), actual flow regulation accuracy R j′ =|(Q j -Q j′ ) / Q j |; Among them, R j To design flow regulation accuracy; Q j Design flow rate for air supply model, Nm 3 / h; Q j′ is the actual flow rate, Nm 3 / h.

2. The flow control method of the gas supply valve group according to claim 1, characterized in that: The step 1 comprises: Collect the design flow rate Q of the air supply model j In the gas supply branch pressure P 1i With the main pressure P 0i Memory opening K ji , where i=1, 2, 3…n, j=1, 2, 3…m; Establish the air supply model and design the flow rate Q j In the gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji The j-th flow memory opening set K j , K j ={ K j1 , K j2 , ..., K ji , ..., K jn }, where i=1, 2, 3…n, j=1, 2, 3…m.

3. The flow regulation control method of the gas supply valve group according to claim 2, characterized in that: The air supply model is designed to have a flow rate Q j In the gas supply branch pressure P 1i With the main pressure P 0i The memory opening degree K of the regulating valve under ji t j ≥20% when the regulating valve opening, where t j It is the continuous stability rate of the actual flow within the designed adjustment accuracy range.

4. The flow regulation control method of the gas supply valve group according to claim 3, characterized in that: In step 7, the air supply model determines the actual flow rate Q j′ Whether it is in a stable state includes: Actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , then the actual flow rate Q j′ in a stable state; Actual flow regulation accuracy R j′ >Design flow regulation accuracy R j , then the actual flow rate Q j′ In an unstable state.

5. The flow rate regulation and control method of the gas supply valve group according to claim 4, characterized in that: The update conditions include: the air supply model determines the actual flow regulation accuracy R j′ Is the flow regulation accuracy R in the design? j The actual flow rate is within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%; If the actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , and the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j ≥20%, then the actual flow rate Q j′ In a stable state, K j and K are updated, and the flow adjustment of the air supply valve is completed.

6. The flow rate regulation and control method of the gas supply valve group according to claim 5, characterized in that: The update condition also includes: actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j <20%, ​​then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%, record the opening of the regulating valve, and j and K are updated, and the flow adjustment of the air supply valve is completed.

7. The flow rate regulation and control method of the gas supply valve group according to claim 6, characterized in that: The update condition also includes: actual flow regulation accuracy R j′ >Design flow regulation accuracy R j , and the actual flow rate is within the design flow rate adjustment accuracy R j Continuous stability rate within the range t j <20%, ​​then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valve to adjust the actual flow within the design flow regulation accuracy R j Continuous stability rate within the range t j ≥20%, record the opening of the regulating valve, and j and K are updated, and the flow adjustment of the air supply valve is completed.

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