Converter bottom blowing gas supply valve group and pressure-stabilizing regulation method therefor

Abstract

A converter bottom blowing gas supply valve group and a pressure-stabilizing regulation method therefor, relating to the technical field of ferrous metallurgy, and for use in solving the problems that during the gas supply flow regulation of existing converter bottom blowing gas supply valve groups, the gas supply regulation speed is low, and the pressure stabilization speed during the flow regulation is low. The converter bottom blowing gas supply valve group comprises main gas paths (1), branch gas paths (2), and a gas collecting pipe group; the gas collecting pipe group comprises a collecting group (3), a transition pipe (4), and a distributing group (5); m main gas paths (1) are provided, the m main gas paths (1) are connected in parallel, and a main gas path manual ball valve, a main gas path check valve, a main gas path pressure gauge, a main gas path stop valve, and a main gas path regulating valve are provided on each main gas path (1); n branch gas paths (2) are provided, the n branch gas paths (2) are connected in parallel, and a manual ball valve, a check valve, a pressure gauge, a regulating valve, and a flow meter are provided on each branch gas path (1). The converter bottom blowing gas supply valve group has high flow regulation and pressure regulation speed and high precision.

Description

Converter bottom blowing gas supply valve group and pressure stabilization adjustment method Technical Field

[0001] The present application relates to the technical field of iron and steel metallurgy, and in particular to a converter bottom blowing gas supply valve group and a pressure stabilization and regulation method. 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 homogenization of the molten metal composition and temperature, thereby improving the quality and efficiency of converter smelting.

[0003] In order to realize the bottom blowing gas supply of the converter, a bottom blowing gas supply valve group is equipped to control the gas supply. During the gas supply flow adjustment process of the bottom blowing valve group, there are problems such as large fluctuations in gas supply pressure and slow gas supply adjustment speed. To achieve stable pressure and rapid flow adjustment, the existing process generally adopts the gas bag pressure stabilization method and the flow controller control method. The gas bag is a gas storage device that stores a certain amount of gas at a specific pressure to alleviate the gas source pressure fluctuation caused by flow adjustment during the flow adjustment process, so as to achieve stable pressure and rapid adjustment. Although the gas bag pressure stabilization method has a certain pressure stabilization effect, if the gas storage volume is large, the gas bag volume will be huge, and if the gas bag volume is small, the gas storage volume will be small. It is difficult to achieve effective unification of gas storage volume and gas bag volume, and thus it is also difficult to achieve effective stabilization of bottom blowing gas supply pressure. Moreover, when switching gas types, the release of stored gas makes it impossible to achieve rapid gas switching, which affects the control of the bottom blowing gas supply of the converter. The control principle of the flow controller is to achieve rapid flow adjustment by directly controlling the flow. Although the flow controller regulating valve can achieve accurate and rapid flow adjustment within a certain range, its adjustment process is greatly affected by pressure fluctuations and is limited by the control method. It is difficult to achieve flow regulation within a large range. Therefore, in actual industrial production, non-flow controller valve groups are often used for flow adjustment within a large range.

[0004] Therefore, although methods and equipment are available in industrial production that can achieve rapid flow rate adjustment, limitations in the equipment or control methods prevent the simultaneous stable adjustment of the gas flow rate and rapid pressure stabilization during the flow adjustment process. Therefore, a converter bottom-blowing gas supply valve group and pressure stabilization method are urgently needed to achieve rapid stabilization of the gas supply pressure while simultaneously achieving stable adjustment of the gas flow rate during the converter bottom-blowing gas supply control process.

[0005] Summary of the Invention

[0006] In view of the above analysis, the embodiments of the present application aim to provide a converter bottom blowing gas supply valve group and a pressure stabilization adjustment method to solve the problems of slow gas supply adjustment speed and slow pressure stabilization speed during the gas supply flow adjustment process of the existing converter bottom blowing gas supply valve group.

[0007] The purpose of this application is mainly achieved through the following technical solutions:

[0008] On the one hand, the present application provides a converter bottom blowing gas supply valve group, including a main gas line, a branch gas line, and a gas collecting pipe group;

[0009] The gas collecting pipe group includes a collecting group, a transition pipe and a distribution group;

[0010] There are m main gas circuits, which are connected in parallel. Each main gas circuit is provided with a main gas circuit manual ball valve, a main gas circuit check valve, a main gas circuit pressure gauge, a main gas circuit shut-off valve, and a main gas circuit regulating valve.

[0011] There are n branch air lines, which are connected in parallel. A manual ball valve, a check valve, a pressure gauge, a regulating valve and a flow meter are provided on each branch air line.

[0012] Furthermore, the collecting group includes a collecting pipe, a connecting pipe and a collecting group gas outlet end, the main gas path is connected to the collecting pipe, and the collecting pipes are connected through flanges and connecting pipes;

[0013] The distribution group includes a distribution pipe, a connecting pipe, a distribution group air inlet end and n distribution group air outlet ends; the branch air path is connected to the distribution pipe, and the distribution pipes are connected through flanges and connecting pipes.

[0014] Furthermore, the transition pipe is an extension pipe of the gas outlet end of the collection group, one end of which is connected to the gas outlet end of the collection group and the other end is connected to the gas inlet end of the distribution group through a flange device. The transition pipe is provided with a pressure gauge and a thermometer.

[0015] Furthermore, the main gas line diameter is DN40~DN120, and the gas flow range is 100~5000Nm 3 / h;

[0016] The diameter of the branch pipe is DN10~DN60, and the air supply flow range is 100~500Nm 3 / h;

[0017] The diameters of the collecting pipe, transition pipe, distribution pipe, and connecting pipe are equal to the diameter of the main gas line.

[0018] On the other hand, the present application also provides a method for stabilizing and regulating the pressure of a converter bottom blowing gas supply valve group, which is used for the above converter bottom blowing gas supply valve group, comprising the following steps:

[0019] Step 1: Set the stable pressure P and design flow Q of the gas collection group in the gas supply model j ;

[0020] Step 2: Adjust the regulating valves of multiple main gas lines and branch gas lines until the actual flow of the gas supply valve group reaches the design flow Q jAfter the gas collection group pressure is within the stable pressure range, collect the design flow Q j The memory opening L of the regulating valve of the corresponding main gas line and branch gas line under different branch gas line pressure and main gas line pressure ai-j , establish the air supply model and design the flow rate Q j The memory opening set K of the regulating valve under different branch line pressures and main line pressures ja The j-th flow memory opening set K j ;

[0021] Step 3: Create a memory opening set K based on the j-th flow j The set K composed of

[0022] Step 4: When the air supply model switches to different design flow rates, firstly according to the design flow rate Q to be switched to j , select Q from the set K j The corresponding j-th flow memory opening set K j ;

[0023] Step 5: According to the corresponding bronchial pressure P 1i With the main gas pressure P 0i , in the set K j Select the corresponding memory opening set K of the main gas line and branch gas line regulating valve ja ;

[0024] Step 6: In the memory opening set K ja Determine the design flow rate Q j The memory opening L of the regulating valve of the corresponding main gas line and branch gas line under the corresponding branch gas line pressure and main gas line pressure ai-j ;

[0025] Step 7: Control the main gas line and branch gas line regulating valve to the memory opening L ai-j adjust;

[0026] Step 8: After the main gas line and branch gas line regulating valves are adjusted, measure the actual flow rate Q at this time j′ and the gas collection group pressure P′;

[0027] Step 9: According to the actual flow Q j′ , calculate the actual flow accuracy R j′ , according to the pressure P′ of the gas collection group, calculate the pressure fluctuation ΔP of the gas collection group, and the gas supply model determines the actual flow rate Q j′ Is it in a stable state and whether the pressure fluctuation ΔP of the gas collection group is within the stable pressure range, and calculate the actual flow rate Q j′ In the design flow regulation accuracy range R j Continuous stability rate within

[0028] Step 10: The air supply model determines whether to update K according to the update conditions. ja , K 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.

[0029] Furthermore, the step 2 includes:

[0030] Collect design flow Q j In the bronchial pressure P 1a With the main gas pressure P 0a The corresponding main gas line and branch gas line regulating valve memory opening L ai-j ;

[0031] Establish model and design flow rate Q j In the bronchial pressure P 1a With the main gas pressure P 0a The memory opening set K under ja , K ja ={L a1-j , L a2-j ,...,L ai-j ,...,L a(m+n)-j}, where L ai-j Design flow Q for the model j In the bronchial pressure P 1a With the main gas pressure P 0a The memory opening of the regulating valve of a main gas line or branch gas line, where a = 1, 2, 3, ... n; j = 1, 2, 3 ... x;

[0032] Establish the air supply model and design the flow rate Q j In the bronchial pressure P 1a With the main gas pressure P 0a The memory opening set K of the regulating valve under ja The j-th flow memory opening set K j , K j ={K j1 , K j2 ,..,K ja , ..., K jn}, where a=1, 2, 3,…n; j=1, 2, 3…x.

[0033] Furthermore, the design flow rate Q j In the bronchial pressure P 1a With the main gas pressure P 0a The corresponding main gas line and branch gas line regulating valve memory opening L ai-j t j ≥20% when the regulating valve opening, where t jIt is the continuous stability rate of the actual flow within the designed adjustment accuracy range.

[0034] Furthermore, the t j =T j / T 0j ×100%,

[0035] Among them, T j is the continuous stable time of actual flow within the design regulation accuracy range, s;

[0036] T 0j Set the air supply time for the air supply model design flow, s.

[0037] Furthermore, the designed flow regulation accuracy R j = ±(7.25-1.16ln(Q j )),

[0038] Among them, R j To design flow regulation accuracy;

[0039] Q j is the design flow rate, Nm 3 / h.

[0040] Furthermore, the pressure stabilization range is: the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa.

[0041] Compared with the prior art, this application can achieve at least one of the following beneficial effects:

[0042] 1. This application adopts multiple main gas paths in parallel. After the multiple main gas paths are gathered into a connected gathering pipe, the connection between the main gas path and the branch gas path is realized through a transition pipe, and the branch gas path is distributed. The gathering group is many to one, that is, multiple parallel gas source inlets correspond to one gas source outlet; after multiple parallel gas sources flow out from multiple main gas paths, they are gathered through the gathering pipe and the connecting pipe, and then flow into the transition pipe through the gas outlet end of the gathering group; one gathering group can realize the gathering and switching of multiple gas sources.

[0043] 2. The method of this application establishes a set of memory openings of the regulating valves at different design flow rates under different branch pressures and main pressures in the gas supply model. When the corresponding flow rate adjustment and gas collection pipe group pressure adjustment are subsequently performed, the regulating valves in the gas supply valve group can be quickly adjusted to the corresponding openings according to the data in the memory opening set of the regulating valves. The flow adjustment speed of the regulating valves 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 and pressure regulation speed are faster and the accuracy is improved.

[0044] 3. The method of the present application establishes a set of memory openings of the regulating valves for different design flows at different gas supply branch pressures and main line pressures in the gas supply model, and updates the set of memory openings of the regulating valves according to the adjustment results when performing corresponding flow adjustments and gas collecting pipe group pressure adjustments in the subsequent process, thereby ensuring the accuracy of the gas supply model in adjusting the gas supply valve group.

[0045] In this application, the above-mentioned technical solutions can be combined with each other to achieve more preferred combination solutions. Other features and advantages of this application will be described in the subsequent description, and some advantages will become apparent from the description or be understood by practicing this application. The objectives and other advantages of this application can be achieved and obtained through the contents particularly pointed out in the description and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] The accompanying drawings are only for the purpose of illustrating particular embodiments and are not to be considered as limiting the present application. Like reference symbols denote like components throughout the drawings.

[0047] FIG1 is a schematic diagram of a converter bottom blowing gas supply valve assembly according to Example 1 of the present application;

[0048] Figure 2 is a top view of the converter bottom blowing gas supply valve group in Example 1 of the present application.

[0049] Reference numerals:

[0050] 1- Main gas line; 2- Branch gas line; 3- Collection group; 4- Transition pipe; 5- Distribution group; 6- Connecting pipe. DETAILED DESCRIPTION

[0051] The preferred embodiments of the present application are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of the present application and are used together with the embodiments of the present application to illustrate the principles of the present application, and are not used to limit the scope of the present application.

[0052] A converter bottom blowing gas supply valve group, comprising a main gas line, a branch gas line, and a gas collecting pipe group;

[0053] The gas collecting pipe group includes a collecting group, a transition pipe and a distribution group;

[0054] There are m main gas lines connected in parallel, and each main gas line is provided with a main gas line manual ball valve, a main gas line check valve, a main gas line pressure gauge, a main gas line shut-off valve, and a main gas line regulating valve; wherein m=1-6, and M is an integer;

[0055] There are n branch air lines connected in parallel, and each branch air line is provided with a manual ball valve, a check valve, a pressure gauge, a regulating valve, and a flow meter; wherein n=2 to 30, and n is an integer;

[0056] The collecting group includes a collecting pipe, a connecting pipe and a collecting group gas outlet end, the main gas path is connected to the collecting pipe, and the collecting pipes are connected by flanges and connecting pipes;

[0057] The distribution group includes a distribution pipe, a connecting pipe, a distribution group air inlet end and n distribution group air outlet ends; the branch air path is connected to the distribution pipe, and the distribution pipes are connected by flanges and connecting pipes;

[0058] The transition pipe is an extension pipe of the gas outlet end of the collection group. One end is connected to the gas outlet end of the collection group and the other end is connected to the gas inlet end of the distribution group through a flange device, thereby achieving communication between the main gas line and the branch gas line. A pressure gauge and a thermometer are provided on the transition pipe.

[0059] It should be noted that the collection group is many-to-one, that is, multiple parallel gas source inlets correspond to one gas source outlet; after multiple parallel gas sources flow out from multiple main gas paths, they are collected through the collection pipe and the connecting pipe, and then flow into the transition pipe through the gas outlet of the collection group; one collection group can realize the collection and switching of 1 to 6 gas sources, and the gas source gas types are: one or more of nitrogen, argon, air, oxygen, CO, CO2, CH4, C2H4, and C3H6; after multiple parallel gas sources flow into the transition pipe, they enter the distribution group inlet pipe, and then are distributed through multiple distribution pipes, and can flow out from the gas outlet of multiple distribution groups.

[0060] The main gas line diameter is DN40~DN120, and the gas flow range is 100~5000Nm 3 / h; the branch pipe diameter is DN10~DN60, and the gas flow range is 100~500Nm 3 / h; the diameters of the collecting pipe, transition pipe, distribution pipe, and connecting pipe are consistent with the main gas line diameter and are DN40 to DN120.

[0061] The present application also provides a method for stabilizing and regulating the pressure of a converter bottom blowing gas supply valve group, which is implemented by the converter bottom blowing gas supply valve group, comprising the following steps:

[0062] Step 1: Set the stable pressure P and design flow Q of the gas collection group in the gas supply model j ;

[0063] Step 2: Adjust the regulating valves of multiple main gas lines and branch gas lines until the actual flow of the gas supply valve group reaches the design flow Q j After the gas collection group pressure is within the stable pressure range, collect the design flow Q j The memory opening L of the regulating valve of the corresponding main gas line and branch gas line under different branch gas line pressure and main gas line pressure ai-j , establish the air supply model and design the flow rate Q j The memory opening set K of the regulating valve under different branch line pressures and main line pressures jaThe j-th flow memory opening set K j ;

[0064] Step 3: Create a memory opening set K based on the j-th flow j The set K composed of

[0065] Step 4: When the air supply model switches to different design flow rates, firstly according to the design flow rate Q to be switched to j , select Q from the set K j The corresponding j-th flow memory opening set K j ;

[0066] Step 5: According to the corresponding bronchial pressure P 1i With the main gas pressure P 0i , in the set K j Select the corresponding memory opening set K of the main gas line and branch gas line regulating valve ja ;

[0067] Step 6: In the memory opening set K ja Determine the design flow rate Q j The memory opening L of the regulating valve of the corresponding main gas line and branch gas line under the corresponding branch gas line pressure and main gas line pressure ai-j ;

[0068] Step 7: Control the main gas line and branch gas line regulating valve to the memory opening L ai-j adjust;

[0069] Step 8: After the main gas line and branch gas line regulating valves are adjusted, measure the actual flow rate Q at this time j′ and the gas collection group pressure P′;

[0070] Step 9: According to the actual flow Q j′ , calculate the actual flow accuracy R j′ , according to the pressure P′ of the gas collection group, calculate the pressure fluctuation ΔP of the gas collection group, and the gas supply model determines the actual flow rate Q j′ Is it in a stable state and whether the pressure fluctuation ΔP of the gas collection group is within the stable pressure range, and calculate the actual flow rate Q j′ In the design flow regulation accuracy range R j Continuous stability rate within

[0071] Step 10: The air supply model determines whether to update K according to the update conditions. ja , K 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.

[0072] Specifically, in step 2, the pressure stabilization range is: the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa;

[0073] Adjust the regulating valves of multiple main gas lines and branch gas lines until the actual flow of the gas supply valve group reaches the design flow Q j After the gas collection group pressure is in the stable pressure range, first collect the design flow Q1 at the branch pressure P 1a With the main gas pressure P 0a The corresponding main gas line and branch gas line regulating valve memory opening L ai-j ;

[0074] Establish the design flow Q1 at the branch pressure P 1a With the main gas pressure P 0a The memory opening set K under 1a (a=1, 2, 3, ... n);

[0075] The memory opening set K 1a The memory opening set is composed of the memory opening of the corresponding main gas line and branch gas line control valve. The memory opening of each main gas line and branch gas line is the control valve opening when t1≥20%, where t1 is the actual flow rate 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;

[0076] 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.

[0077] For example, the model design flow Q1 is at the bronchial pressure P 11 With the main gas pressure P 01 The memory opening set K under 11 , K 11 ={L 11-1 , L 12-1 ,...L1i-1 , L 1(m+n)-1}, where i = 1, 2, 3...(m+n), L 1i-1 The model design flow Q1 is at the bronchial pressure P 11 With the main gas pressure P 01 Memory opening of the regulating valve of a main gas line or branch gas line;

[0078] The model design flow Q1 at the bronchial pressure P 12 With the main gas pressure P 02 The memory opening set K under 12 , K 12 ={L 21-1 , L 22-1 ,...,L 2i-1 ,...,L 2(m+n)-1}, where L 2i-1 The model design flow Q1 is at the bronchial pressure P 12 With the main gas pressure P 02 Memory opening of the regulating valve of a main gas line or branch gas line;

[0079] The model design flow Q1 at the bronchial pressure P 13 With the main gas pressure P 03 The memory opening set K under 13 , K 13 ={L 31-1 , L 32-1 ,...,L 3i-1 ,...,L 3(m+n)-1}, where L 3i-1 The model design flow Q1 is at the bronchial pressure P 13 With the main gas pressure P 03 Memory opening of the regulating valve of a main gas line or branch gas line;

[0080] The model design flow Q1 at the bronchial pressure P 1a With the main gas pressure P 0a Memory opening K 1a , K 1a ={L a1-1 , L a2-1 ,...,L ai-1 ,...,L a(m+n)-1}, where L ai-1 The model design flow Q1 is at the bronchial pressure P 1a With the main gas pressure P 0a Memory opening of the regulating valve of a main gas line or branch gas line;

[0081] Establish the air supply model to design the flow Q1 and the regulating valve memory opening K under different branch line pressures and main line pressures 1a(a=1,2,3,…n) composed of the first flow memory opening set K1, K1={K 11 , K 12 , ..., K 1a , ..., K 1n}.

[0082] Similarly, the design flow rate Q2 of the air supply model is established at the branch pressure P 1a With the main gas pressure P 0a The memory opening set K under 2a (a=1,2,3,…n), K 2a ={L a1-2 , L a2-2 ,...,L ai-2 ,...,L a(m+n)-2}, where L ai-2 The model design flow Q2 is at the bronchial pressure P 1a With the main gas pressure P 0a Memory opening of the regulating valve of a main gas line or branch gas line;

[0083] Then, the control valve memory opening set K of the air supply model design flow Q2 under different branch line pressures and main line pressures is established. 2a The second flow memory opening set K2 composed of (a=1, 2, 3, ... n), K2={K 21 , K 22 , ..., K 2a , ..., K 2n}.

[0084] Similarly, establish a model to design the flow Q j In the bronchial pressure P 1a With the main gas pressure P 0a Memory opening K ja (a=1, 2, 3,...n; j=1, 2, 3...x), K ja ={L a1-j , L a2-j ,...,L ai-j ,...,L a(m+n)-j}, where L ai-j Design flow Q for the model j In the bronchial pressure P 1a With the main gas pressure P 0a Memory opening of the regulating valve of a main gas line or branch gas line;

[0085] Then, the air supply model design flow Q is established j The memory opening set K of the regulating valve under different branch line pressures and main line pressures jaThe j-th flow memory opening set K composed of (a=1,2,3,…n) j , K j ={K j1 , K j2 ,..,K ja , ..., K jn}.

[0086] The memory opening K ja The memory opening set is composed of the memory opening of the corresponding main gas line and branch gas line regulating valve. The memory opening of each main gas line and branch gas line 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 model j Set gas supply time;

[0087] 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.

[0088] In step 3, 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 x}.

[0089] Specifically, in step 9, 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%, whether the pressure fluctuation ΔP of the gas collection group is within the stable pressure range;

[0090] 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%, and the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa; then the actual flow rate Q j′ In a stable state and the gas collection group is in a stable pressure state, K ja , K j and K are updated, and the flow and pressure regulation of the gas supply valve group is completed.

[0091] 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%, but the pressure fluctuation ΔP of the gas collection group does not meet the requirement of 0.4MPa≤ΔP≤2.0MPa; then the actual flow rate Q j′ The gas collection group is in a stable state, but the gas collection group is in a non-stable pressure state. The gas supply model automatically controls the opening of the regulating valve of some main gas lines and branch gas lines to make the pressure fluctuation ΔP of the gas collection group meet 0.4MPa≤ΔP≤2.0MPa, and records the opening of the regulating valve of the corresponding main gas line and branch gas line. ja , K j and K are updated, and the flow and pressure regulation of the gas supply valve group is completed.

[0092] If the actual flow regulation accuracy R j′ ≤ Design flow regulation accuracy R j , but the actual flow rate is within the design flow regulation accuracy R j Continuous stability rate within the range t j <20%, the pressure fluctuation ΔP of the gas collection group does not meet the requirement of 0.4MPa≤ΔP≤2.0MPa; then the actual flow rate Q j′ In an unstable state, the gas collection group is in an unsteady pressure state, and the gas supply model automatically controls the opening of the regulating valves of some main gas lines and branch gas lines to make the actual flow within the designed flow regulation accuracy R j Continuous stability rate within the range tj ≥20% At the same time, the pressure fluctuation ΔP of the gas collection group meets 0.4MPa≤ΔP≤2.0MPa, and the opening of the regulating valve of the corresponding main gas line and branch gas line is recorded. ja , K j and K are updated, and the flow and pressure regulation of the gas supply valve group is completed.

[0093] If the actual flow regulation accuracy R j′ >Design flow regulation accuracy R j , then the actual flow rate Q j′ In an unstable state, the air supply model automatically controls the opening of the regulating valves of some main air lines and branch air lines to make 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%, and the pressure fluctuation ΔP of the gas collection group meets 0.4MPa≤ΔP≤2.0MPa, record the opening of the corresponding main gas line and branch gas line regulating valve, and calculate the K ja , K j and K are updated, and the flow and pressure regulation of the gas supply valve group is completed.

[0094] The present application designs a bottom blowing gas supply valve group for a converter and establishes a set of memory openings of regulating valves for different design flows at different gas supply branch pressures and main line pressures in a gas supply model. When the corresponding flow and gas collection group pressure are subsequently adjusted, the regulating valves in the gas supply valve group can be quickly adjusted to the corresponding openings according to the data in the memory opening set of the regulating valves. The flow adjustment speed is fast, the pressure fluctuation of the gas collection group is small, and rapid pressure stabilization of the gas collection group can be achieved.

[0095] Example 1

[0096] The converter bottom blowing gas supply valve group of this embodiment includes a main gas path, branch gas paths, and a gas collecting pipe group, as shown in FIG1 .

[0097] The gas collecting pipe group includes a collecting group, a transition pipe and a distribution group;

[0098] There are four main gas circuits, which are connected in parallel. Each main gas circuit is provided with a main gas circuit manual ball valve, a main gas circuit check valve, a main gas circuit pressure gauge, a main gas circuit shut-off valve, and a main gas circuit regulating valve.

[0099] There are 8 branch gas lines, which are connected in parallel. Each branch gas line is equipped with a manual ball valve, a check valve, a pressure gauge, a regulating valve, and a flow meter.

[0100] The collecting group includes four collecting pipes, a connecting pipe and a collecting group outlet end. The four main gas paths are connected to the four collecting pipes respectively, and the collecting pipes are connected by flanges and connecting pipes.

[0101] The distribution group includes 8 distribution pipes, 3 connecting pipes, a distribution group air inlet end and 8 distribution group air outlet ends; the branch air path is connected to the distribution pipes, and the distribution pipes are connected by flanges and connecting pipes;

[0102] The transition pipe is an extension pipe of the gas outlet end of the collection group. One end is connected to the gas outlet end of the collection group and the other end is connected to the gas inlet end of the distribution group through a flange device, thereby achieving communication between the main gas line and the branch gas line. A pressure gauge and a thermometer are provided on the transition pipe.

[0103] It should be noted that the collection group is four to one, that is, four parallel gas source inlets correspond to one gas source outlet; after the four parallel gas sources flow out from the four main gas paths, they are collected through the collection pipe and the connecting pipe, and then flow into the transition pipe through the gas outlet of the collection group; one collection group can realize the collection and switching of four gas sources; after the four parallel gas sources flow into the transition pipe, they enter the distribution group air inlet pipe, and then are distributed through 8 distribution pipes, and can flow out from the gas outlet of the 8 distribution groups.

[0104] The main gas line diameter is DN40, and the gas flow range is 100Nm 3 / h; the branch pipe diameter is DN10, and the gas flow range is 100Nm 3 / h; the diameters of the collecting pipe, transition pipe, distribution pipe, and connecting pipe are consistent with the main gas line diameter, which is DN40.

[0105] Example 2

[0106] This embodiment provides a method for stabilizing and regulating the pressure of a converter bottom blowing gas supply valve group, which is implemented by a converter bottom blowing gas supply valve group similar to that of Example 1. The gas supply valve group has one main gas line and six branch gas lines.

[0107] The following steps are involved:

[0108] Step 1: Set the stable pressure P and design flow Q of the gas collection group in the gas supply model j ;

[0109] The stable pressure P of the gas gathering group is 1.5 MPa, and the design flow rates of the gas supply model are:

[0110] Q1=50Nm 3 / h, Q2=100Nm 3 / h;

[0111] Step 2: Adjust the regulating valves of multiple main gas lines and branch gas lines until the actual flow of the gas supply valve group reaches the design flow Q jAfter the gas collection group pressure is within the stable pressure range, collect the design flow Q j The memory opening L of the regulating valve of the corresponding main gas line and branch gas line under different branch gas line pressure and main gas line pressure ai-j , establish the air supply model and design the flow rate Q j The memory opening set K of the regulating valve under different branch line pressures and main line pressures ja The j-th flow memory opening set K j :

[0112] Q1(50Nm 3 / h) When the pressure of the six branch gas lines is 0.3 MPa and the main gas line pressure is 1.5 MPa, the memory opening of the main gas line regulating valve is 30%, and the memory opening of the six branch gas line regulating valves is 31%; that is, the memory opening set K 11 , K 11 ={L 11-1 , L 12-1 , L 13-1 , L 14-1 L 15-1 , L 16-1 , L 17-1} = {30%, 31%, 31%, 31%, 31%, 31%};

[0113] Q1(50Nm 3 / h) When the pressure of the six branch gas lines is 0.8 MPa and the main gas line pressure is 1.5 MPa, the memory opening of the main gas line regulating valve is 35%, and the memory opening of the six branch gas line regulating valves is 36%; that is, the memory opening set K 12 , K 12 ={L 21-1 , L 22-1 , L 23-1 , L 24-1 L 25-1 , L 26-1 , L 27-1} = {35%, 36%, 36%, 36%, 36%, 36%};

[0114] Air supply model design flow rate 50Nm 3 / h is the first flow memory opening set K1 composed of the memory opening of the regulating valve at different supply branch pressures, K1={K 11 , K 12};

[0115] Q2(100Nm 3 / h) When the pressure of the six branch gas lines is 0.6 MPa and the main gas line pressure is 1.5 MPa, the memory opening of the main gas line regulating valve is 60%, and the memory opening of the six branch gas line regulating valves is 61%; that is, the memory opening set K21 , K 21 ={L 11-2 , L 12-2 , L 13-2 , L 14-2 , L 15-2 , L 16-2 , L 17-2} = {60%, 61%, 61%, 61%, 61%, 61%};

[0116] Q1(100Nm 3 / h) When the pressure of the six branch gas lines is 1.1 MPa and the main gas line pressure is 1.5 MPa, the memory opening of the main gas line regulating valve is 65%, and the memory opening of the six branch gas line regulating valves is 66%; that is, the memory opening set K 22 , K 22 ={L 21-2 , L 22-2 , L 23-2 , L 24-2 , L 2,2 , L 26-2 , L 27-2} = {65%, 66%, 66%, 66%, 66%, 66%};

[0117] Air supply model design flow rate 100Nm 3 / h is the first flow memory opening set K2 composed of the memory opening of the regulating valve at different supply branch pressures, K2 = {K 21 , K 22};

[0118] After calculation, the regulation accuracy corresponding to the design flow rate Q1 of the air supply model is R1=±(7.25-1.16ln(Q1)), which is 2.71; similarly, R2=1.90;

[0119] Step 3: Create a memory opening set K based on the j-th flow j The set K composed of

[0120] K = {K1, K2};

[0121] Step 4: When the air supply model switches to different design flow rates, first, according to the design flow rate to be switched to 50Nm 3 / h, select 50Nm from the set K 3 / The first flow memory opening set K1 corresponding to h;

[0122] Step 5: According to the corresponding bronchial pressure P 11 (0.3MPa) and the main gas line pressure P 01 (1.5MPa), select the corresponding memory opening set K of the main gas line and branch gas line regulating valve in the set K111 ;

[0123] Step 6: In the memory opening set K 11 Determine the design flow rate Q1 (50Nm 3 / h) Memory opening L of the corresponding main and branch gas regulating valves at the corresponding branch gas pressure and main gas pressure 11-1 (30%), L 12-1 (31%), L 13-1 (31%), L 14-1 (31%), L 15-1 (31%), L 16-1 (31%), L 17-1 (31%);

[0124] Step 7: Control the main gas line and branch gas line regulating valve to the memory opening respectively to L 11-1 (30%), L 12-1 (31%), L 13-1 (31%), L 14-1 (31%), L 15-1 (31%), L 16-1 (31%), L 17-1 (31%) regulation;

[0125] Step 8: After all the regulating valves of the main gas line and branch gas line are adjusted, measure the actual flow rate Q at this time j′ and the gas collection group pressure P′;

[0126] Q 1′ =49Nm 3 / h, P′=2.0MPa;

[0127] Step 9: According to the actual flow Q j′ (49Nm 3 / h), calculate the actual flow 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;

[0128] According to the gas gathering group pressure P′=2.0MPa, the gas gathering group pressure fluctuation ΔP=0.5MPa is calculated, which satisfies 0.4MPa≤ΔP≤2.0MPa. The gas supply model determines that the gas gathering group pressure fluctuation ΔP is within the stable pressure range.

[0129] Step 10: The air supply model determines whether to update K according to the update conditions. ja , K j and K for update,

[0130] To meet the actual flow regulation accuracy R 1′ ≤ the design flow regulation accuracy R1, and the continuous stability rate t1 of the actual flow within the design flow regulation accuracy R1 is ≥ 20%, and the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa; then the actual flow Q 1′ In a stable state and the gas collection group is in a stable pressure state, K 11 , K1 and K are updated, and the flow and pressure regulation of the gas supply valve group is completed; the adjustment time is 10s, and the adjustment accuracy is -1Nm 3 / h, and the flow stability coefficient is 0.02.

[0131] Similarly, follow the same steps to Q1 (50Nm 3 / h) Flow rate adjustment is performed under the condition that the pressure of the six branch gas lines is 0.8 MPa and the pressure of the main gas line is 1.5 MPa, and the actual flow rate Q at this time is measured. 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; according to the gas collection group pressure P'=2.2MPa, the gas collection group pressure fluctuation ΔP=0.7MPa is calculated, which satisfies 0.4MPa≤ΔP≤2.0MPa. The gas supply model determines that the gas collection group pressure fluctuation ΔP is in the stable pressure range. Because the actual flow regulation accuracy R is met 1′≤ the design flow regulation accuracy R1, and the continuous stability rate t1 of the actual flow within the design flow regulation accuracy R1 is ≥ 20%, and the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa; then the actual flow Q 1′ In a stable state and the gas collection group is in a stable pressure state, K 12 , K1 and K are updated, and the flow and pressure regulation of the air supply valve group is completed; the adjustment time is 8s and the adjustment accuracy is 1Nm 3 / h, and the flow stability coefficient is 0.02.

[0132] Similarly, follow the same steps to Q2 (100Nm 3 / h) Flow rate adjustment is performed under the condition that the pressure of the six branch gas lines is 0.6 MPa and the pressure of the main gas line is 1.5 MPa, and the actual flow rate Q at this time is measured. 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; according to the gas collection group pressure P'=2.1MPa, the gas collection group pressure fluctuation ΔP=0.6MPa is calculated, which satisfies 0.4MPa≤ΔP≤2.0MPa. The gas supply model determines that the gas collection group pressure fluctuation ΔP is in the stable pressure range. Because the actual flow regulation accuracy R is met 1′ ≤ the design flow regulation accuracy R1, and the continuous stability rate t1 of the actual flow within the design flow regulation accuracy R1 is ≥ 20%, and the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa; then the actual flow Q 1′ In a stable state and the gas collection group is in a stable pressure state, K 21 , K2 and K are updated, and the flow and pressure regulation of the gas supply valve group is completed; the adjustment time is 10s, and the adjustment accuracy is -1Nm 3 / h, and the flow stability coefficient is 0.01.

[0133] Similarly, follow the same steps to Q2 (100Nm3 / h) Flow rate adjustment is performed with the pressure of the six branch gas lines at 1.1 MPa and the main gas line at 1.5 MPa, and the actual flow rate Q is measured 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; according to the gas collection group pressure P'=2.5MPa, the gas collection group pressure fluctuation ΔP=1.0MPa is calculated, and 0.4MPa≤ΔP≤2.0MPa is satisfied. The gas supply model determines that the gas collection group pressure fluctuation ΔP is in the stable pressure range. Because the actual flow regulation accuracy R is satisfied 1′ ≤ the design flow regulation accuracy R1, and the continuous stability rate t1 of the actual flow within the design flow regulation accuracy R1 is ≥ 20%, and the pressure fluctuation ΔP of the gas collection group satisfies 0.4MPa≤ΔP≤2.0MPa; then the actual flow Q 1′ In a stable state and the gas collection group is in a stable pressure state, K 22 , K2 and K are updated, and the flow and pressure regulation of the gas supply valve group is completed; the adjustment time is 10s, and the adjustment accuracy is 1Nm 3 / h, and the flow stability coefficient is 0.01.

[0134] Comparative Example

[0135] In this comparative example, the flow rate of a gas supply valve group identical to that in Example 2 is regulated by the gas bag pressure stabilization method, and the steps are as follows:

[0136] 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; at the same time, gradually release the gas in the air bag and adjust the pressure of the gas gathering group so that the pressure fluctuation ΔP of the gas gathering group meets 0.4MPa≤ΔP≤2.0MPa.

[0137] Among them, the design flow rate is Q j Q1 = 50 Nm 3 / h, Q2=100Nm 3 / h;

[0138] Q1=50Nm 3 / h, the flow rate is adjusted when the pressure of the 6 branch gas lines is 0.3MPa and the main gas line pressure is 1.5MPa. The flow rate of the regulating valve detected by the flow meter 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; gradually release the gas in the air bag and adjust the pressure of the gas collection group so that the pressure fluctuation ΔP of the gas collection group meets 0.4MPa≤ΔP≤2.0MPa. This adjustment is completed. The adjustment time is 40s and the adjustment accuracy is -2.75Nm 3 / h, the flow stability coefficient is 0.055;

[0139] Similarly, follow the same steps to Q1 (50Nm 3 / h) Flow regulation is performed under the conditions that the pressure of the six branch gas lines is 0.8 MPa and the pressure of the main gas line is 1.5 MPa. The flow rate of the regulating valve detected by the flow meter is 44 Nm 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, within the required accuracy range; gradually release the gas in the air bag and adjust the pressure of the gas collection group so that the pressure fluctuation ΔP of the gas collection group meets 0.4MPa≤ΔP≤2.0MPa. This adjustment is completed. The adjustment time is 45s and the adjustment accuracy is -1.49Nm 3 / h, the flow stability coefficient is 0.029;

[0140] Similarly, follow the same steps to Q2 (100Nm 3 / h) Flow regulation is performed under the conditions that the pressure of the six branch gas lines is 0.6 MPa and the pressure of the main gas line is 1.5 MPa. The flow rate of the regulating valve detected by the flow meter is 92 Nm 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; gradually release the gas in the air bag and adjust the pressure of the gas collection group so that the pressure fluctuation ΔP of the gas collection group meets 0.4MPa≤ΔP≤2.0MPa. This adjustment is completed. The adjustment time is 35s and the adjustment accuracy is -2.48Nm 3 / h, the flow stability coefficient is 0.025;

[0141] Similarly, follow the same steps to Q2 (100Nm 3 / h) Flow regulation is performed under the conditions that the pressure of the six branch gas lines is 1.1 MPa and the pressure of the main gas line is 1.5 MPa. The flow rate of the regulating valve detected by the flow meter is 95 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 8%, the flow meter detects the regulating valve flow rate is 102.6Nm 3 / h, within the required accuracy range; gradually release the gas in the air bag and adjust the pressure of the gas collection group so that the pressure fluctuation ΔP of the gas collection group meets 0.4MPa≤ΔP≤2.0MPa. This 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.

[0142] From the examples and comparative examples, it can be seen that the method of the present application adjusts the flow of the gas supply valve group and stabilizes the pressure of the gas collection group at the same time. 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 and the pressure of the gas collection 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 air supply valve group of the present application has a fast air supply adjustment speed and a fast pressure stabilization speed during the air supply flow adjustment process.

[0143] The above is only a preferred specific implementation method of the present application, but the scope of protection of the present application is not limited thereto. Any changes or replacements that can be easily thought of by any technician familiar with this technical field within the technical scope disclosed in this application should be covered by the scope of protection of the present application.

Claims

1. A bottom blowing gas supply valve group for a converter, characterized in that, It includes a main gas path, branch gas paths, and a gas collecting pipe group; The gas collecting pipe group includes a collecting group, a transition pipe, and a distribution group; There are m main gas paths, and the m main gas paths are in parallel. A manual ball valve for the main gas path, a check valve for the main gas path, a pressure gauge for the main gas path, a cut-off valve for the main gas path, and a regulating valve for the main gas path are provided on each main gas path; There are n branch gas paths, and the n branch gas paths are in parallel. A manual ball valve, a check valve, a pressure gauge, a regulating valve, and a flowmeter are provided on each branch gas path.

2. The gas supply valve group according to claim 1, wherein, The collecting group includes a collecting pipe, a connecting pipe, and an outlet end of the collecting group. The main gas path is connected to the collecting pipe, and the collecting pipes are connected through flanges and connecting pipes; The distribution group includes a distribution pipe, a connecting pipe, an inlet end of the distribution group, and n outlet ends of the distribution group; the branch gas path is connected to the distribution pipe, and the distribution pipes are connected through flanges and connecting pipes.

3. The gas supply valve group according to claim 2, wherein, The transition pipe is an extension pipe of the outlet end of the collecting group. Through a flange device, one end is connected to the outlet end of the collecting group, and the other end is connected to the inlet end of the distribution group. A pressure gauge and a thermometer are provided on the transition pipe.

4. The air supply valve group according to claim 3, wherein The diameter of the main gas pipeline is DN40 - DN120, and the gas supply flow range is 100 - 5000 Nm 3 / h; The diameter of the bronchial airway is DN10 - DN60, and the air supply flow range is 100 - 500 Nm 3 / h; The diameters of the collecting pipe, the transition pipe, the distribution pipe, and the connecting pipe are equal to the diameter of the main gas path.

5. A method for stabilizing and regulating the pressure of the bottom blowing gas supply valve group of a converter, which is used for the bottom blowing gas supply valve group described in any one of claims 1-4, characterized in that, It includes the following steps: Step 1: Set the stable pressure P and the designed flow rate Q of the gas collecting group in the gas supply model j ; Step 2: Adjust the regulating valves of multiple main gas paths and branch gas paths until the actual flow rate of the gas supply valve group Reach the design flow rate Q j After the pressure of the gas collection group is within the stable pressure range, collect the design flow rate Q j The memory opening degrees L of the regulating valves of the corresponding main gas path and branch gas paths under different branch gas path pressures and main gas path pressures ai-j , establish the design flow rate Q of the gas supply model j The set K of the memory opening degrees of the regulating valves under different branch gas path pressures and main gas path pressures ja The jth flow memory opening degree set K composed of j ; Step 3: Establish a set K composed of the j-th flow memory opening degree set K j to form the set K; Step 4: When the gas supply model switches to different design flows, first, according to the design flow Q to be switched to j , select the j-th flow memory opening set K corresponding to Q j in the set K j ; Step 5: According to the corresponding bronchial airway pressure P 1i and the main airway pressure P 0i , select the corresponding memory opening degree sets K j of the main airway and bronchial airway regulating valves in the set K ja ; Step 6: Determine the design flow rate Q in the memory opening set K ja and the memory opening L of the regulating valves of the corresponding main gas path and branch gas paths at the corresponding branch gas path pressure and main gas path pressure j ; ai-j ; Step 7: Control the main air path and branch air path regulating valves to adjust to the memory opening L ai-j Adjustment; Step 8: After the main gas path and branch gas path regulating valves are adjusted, measure the actual flow rate Q at this time j′ and the pressure P' of the gas collecting group; Step 9: According to the actual flow rate Q j′ , calculate the actual flow rate accuracy R j′ , according to the pressure P' of the gas gathering group, calculate the pressure fluctuation ΔP of the gas gathering group, and the gas supply model determines whether the actual flow rate Q j′ is in a stable state and whether the pressure fluctuation ΔP of the gas gathering group is within the voltage stabilizing range, and calculate the actual flow rate Q j′ The continuous stability rate within the designed flow rate adjustment accuracy range R j ; Step 10: The air supply model determines whether to update K ja , K j and K. If no update is required, the adjustment of the air supply valve for this time ends. If an update is needed, the adjustment of the air supply valve for this time ends after the update is completed.

6. The method for stabilizing and regulating the bottom blowing gas supply valve group of a converter according to claim 5, characterized in that, The said Step 2 includes: Collect the design flow rate Q j At the branch air path pressure P 1a And the main air path pressure P 0a The memory opening L of the regulating valves of the corresponding main air path and branch air path under ai-j ; Establish the model design flow rate Q j At the branch air path pressure P 1a And the main air path pressure P 0a Under the memory opening set K ja , K ja ={L a1-j , L a2-j ,..., L ai-j ,..., L a(m+n)-j}, where L ai-j Is the memory opening of the regulating valve of a certain main air path or branch air path under the model design flow rate Q j At the branch air path pressure P 1a And the main air path pressure P 0a , where a = 1, 2, 3,..., n; j = 1, 2, 3,..., x; Establish the design flow rate Q of the gas supply model j At the pressure P of the branch gas path 1a And the pressure P of the main gas path 0a The set of memory opening degrees K of the regulating valve ja The j-th flow memory opening degree set K composed of j , K j ={K j1 , K j2 ,.., K ja ,..., K jn}, where a = 1, 2, 3,..., n; j = 1, 2, 3,..., x.

7. The method for stabilizing and regulating the bottom blowing gas supply valve group of a converter according to claim 6, characterized in that, The design flow rate Q j At the pressure P of the branch air path 1a And the pressure P of the main air path 0a The memory opening L of the regulating valves of the corresponding main air path and branch air path ai-j Is t j When ≥ 20%, the opening of the regulating valve, where t j Is the continuous stability rate of the actual flow rate within the design regulation accuracy range.

8. The converter bottom blowing gas supply valve group voltage stabilization adjustment method according to claim 7, characterized in that, The said t j = T j / T 0j × 100%, Among them, T j is the continuous stable duration of the actual flow within the design adjustment accuracy range, s; T 0j Set supply duration for the designed flow rate of the air supply model, s.

9. The method for stabilizing and regulating the bottom blowing gas supply valve group of a converter according to claim 8, characterized in that, The design flow rate adjustment accuracy R j = ±(7.25 - 1.16ln(Q j )) Among them, R j is the design flow rate adjustment accuracy; Q j is the design flow rate, Nm 3 / h.

10. The method for stabilizing and regulating the bottom blowing gas supply valve group of a converter according to claim 9, characterized in that, The voltage stabilization range is: the pressure fluctuation ΔP of the gas collecting group satisfies 0.4MPa ≤ ΔP ≤ 2.0MPa.

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