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

Abstract

The present disclosure discloses a converter bottom blowing gas supply valve group and stabilizing pressure adjustment method, belongs to the technical field of ferrous metallurgy, and solves the problems of slow gas supply adjustment speed and slow stabilizing pressure speed during gas supply flow adjustment process of the existing converter bottom blowing gas supply valve group. A converter bottom blowing gas supply valve group, comprising main gas pipeline, branch gas pipeline, gas collecting pipe group; The gas collecting pipe group comprises collecting group, transiting pipe and distributing group; There are m main gas pipelines, which are connected in parallel, and each main gas pipeline is provided with main gas pipeline manual ball valve, main gas pipeline check valve, main gas pipeline pressure gauge, main gas pipeline cut-off valve, and main gas pipeline regulating valve; There are n branch gas pipelines, which are connected in parallel, and each branch gas pipeline is provided with manual ball valve, check valve, pressure gauge, regulating valve, and flow meter. The present disclosure has fast flow regulation and pressure regulation speed, and high accuracy.

Description

TECHNICAL FIELD

[0001] The application pertains to the field of steel metallurgical technology, and in particular, to a converter bottom blowing gas supply valve group and stabilizing pressure adjustment method.BACKGROUND ART

[0002] During the smelting process of steel converter, blowing gas from the bottom of the converter into high-temperature molten pool can effectively improve the agitation of molten metal for promoting the reaction of slag steel and further promote the uniformity of the molten metal composition and temperature, which can improve the smelting quality and efficiency of the converter.

[0003] In order to realize the bottom blowing gas supply of the converter, the converter bottom blowing gas supply valve group is equipped for gas supply control. During the gas supply flow adjustment process of the bottom blowing valve group, there are problems of large fluctuations in gas supply pressure and slow gas supply adjustment speed; in order to achieve pressure stabilization and rapid adjustment during the flow adjustment process, the existing process generally adopts the gas bag stabilizing pressure method and the flow controller control method; as a gas storage device, the gas bag can alleviate the gas source pressure fluctuation caused by flow adjustment during the flow adjustment process by storing a certain amount of gas under specific pressure, so as to achieve pressure stabilization and rapid adjustment; because of large gas storage capacity make the gas bag volume be huge and small gas bag volume make the gas storage capacity be small, although the gas bag stabilizing pressure method has a certain stabilizing pressure effect, it is difficult to achieve the effective unification of the gas storage volume and the gas bag volume, and to achieve the effective stability of the bottom blowing gas supply pressure; and when switching the type of the gas, the release of the stored gas makes it impossible to achieve rapid switching of the gas, which will affect the control of the converter bottom blowing gas supply. The flow controller control method achieves rapid flow adjustment by directly controlling the flow. Because of great effect of pressure fluctuations during the adjustment process and limit from the control method, although the flow controller regulating valve can achieve accurate and rapid flow adjustment within a certain range, it is difficult to achieve flow adjustment within a large range. Therefore, in actual industrial production, flow adjustment within a large range mostly adopts non-flow controller-type valve group.

[0004] Therefore, because of the equipment or control method limit, although there are methods and equipment that can achieve rapid flow adjustment in industrial production, it is not possible to achieve rapid pressure stabilization during the flow adjustment process while achieving stable adjustment of the gas supply flow. Therefore, there is an urgent need for a converter bottom blowing gas supply valve group and stabilizing pressure adjustment method, which can achieve rapid pressure stabilization while achieving stable adjustment of the gas supply flow during the gas supply control process of the converter bottom blowing valve group.SUMMARY OF THE INVENTION

[0005] In view of the above analysis, the present disclosure aims to provide a converter bottom blowing gas supply valve group and stabilizing pressure adjustment method, so as to solve the problem of slow gas supply adjustment speed and slow stabilizing pressure speed during gas supply flow adjustment process of the existing converter bottom blowing gas supply valve group.

[0006] The objects of the present disclosure are mainly realized by the following technical schemes: On the one hand, the present disclosure provides a converter bottom blowing gas supply valve group, comprising main gas pipelines, branch gas pipelines, gas collecting pipe groups; Each of the gas collecting pipe groups comprises collecting groups, a transiting pipe and distributing groups; There are m main gas pipelines, which are connected in parallel. Each main gas pipeline is provided with main gas pipeline manual ball valves, a main gas pipeline check valve, main gas pipeline pressure gauges, a main gas pipeline cut-off valve, and a main gas pipeline regulating valve; There are n branch gas pipelines, which are connected in parallel. Each branch gas pipeline is provided with manual ball valves, a check valve, pressure gauges, a regulating valve, and a flow meter; Further, each of the collecting groups comprises collecting pipes, connecting pipes and gas outlet ends of the collecting groups, the main gas pipelines are connected with one of the collecting pipes, and the collecting pipes are connected through flanges and the connecting pipes; Each of the distributing groups comprises distributing pipes, connecting pipes, gas inlet end of the distributing group and n gas outlet ends of the distributing group; the branch gas pipelines are connected to the distributing pipes, and the distributing pipes are connected through flanges and the connecting pipes.

[0007] Further, the transiting pipe is an extended pipe of the gas outlet ends of the collecting groups, with one end connected to the gas outlet ends of the collecting groups and the other end connected to the gas inlet ends of the distributing groups through flange devices. The transiting pipe is provided with pressure gauges and a thermometer.

[0008] Further, the pipe diameter of the main gas pipeline is DN40-DN120, and the gas supply flow range is 100-5000Nm 3< / h; The pipe diameter of the branch gas pipeline is DN10-DN60, and the gas supply flow range is 100-500Nm 3< / h; The pipe diameters of the collecting pipe, the transiting pipe, the distributing pipe and the connecting pipe are equal to the pipe diameter of the main gas pipeline.

[0009] On the other hand, the present disclosure also provides a pressure stabilization adjustment method of converter bottom blowing gas supply valve group, is used for the above converter bottom blowing gas supply valve group, and includes the following steps: Step1: setting stable pressure P and designed flow Q j of the gas collecting pipe group in gas supply model; Step 2: regulating the regulation valves of the main gas pipelines and the branch gas pipelines, when the actual flow of the gas supply valve group have reached the designed flow Q j and the pressure of the gas collecting group is in the range of the stable pressure, collecting the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under different main gas pipeline pressures and branch gas pipeline pressures for the designed flow Q j , and establishing the j-th flow memory opening set K j composed of the regulation valve memory opening set K ja under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Q j ; Step 3: establishing the set K composed of the j-th flow memory opening set K j ; Step 4: when the gas supply model performs switch between different designed flows, firstly according to the gas supply model designed flow Q j to be switched, in the set K, selecting the j-th flow memory opening set K j corresponding to Q j ; Step 5: according to the corresponding branch gas pipeline pressure P li and main gas pipeline pressure P 0i , selecting the regulation valve memory opening set K ja of the corresponding main gas pipeline and branch gas pipeline from the set K j ; Step 6: in the memory opening set K ja , establishing the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under corresponding main gas pipeline pressures and branch gas pipeline pressures for the designed flow Q j , Step 7: controlling the regulation valves of the main gas pipeline and branch gas pipeline to be regulated to the memory opening K ai-j ; Step 8: after regulating the regulation valves of the main gas pipeline and the branch gas pipeline, measuring the actual flow Q j' and the collecting group pressure P'; Step 9: calculating the actual flow accuracy R j' according to the actual flow Q j' , and calculating the pressure fluctuation ΔP of the gas collection pipe group according to the gas collection pipe group pressure P'; the gas supply model judges whether the actual flow Q j' is in a stable state and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range, and calculates the continuous stability rate of the actual flow Q j' in the range of the designed flow regulation accuracy R j ; Step 10: the gas supply model judges whether updating K ja , K j and K according update condition, if not, ending the regulation of the gas supply valve, or ending the regulation of the gas supply valve after updating.

[0010] Further, the step 2 includes: Collecting the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under the branch gas pipeline pressure P la and the main gas pipeline pressure P 0a for the designed flow Q j ; Establishing the memory opening set K ja of the gas supply model designed flow Q j under the branch gas pipeline pressure P la and the main gas pipeline pressure P 0a , K ja ={L a1-j , L a2-j , ..., L ai-j , ..., L a(m+n)-j }, wherein, L ai-j is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a for the gas supply model designed flow Q j , a=1, 2, 3, ...n; j=1, 2, 3 ...x; Establishing the j-th flow memory opening set K j composed of the regulation valve memory opening set K ja under the branch air pressure P 1a and the main air pressure P 0a for the gas supply model designed flow Q j , wherein, K j ={K j1 , K j2 , .., K ja , ..., K jn }, a=1, 2, 3, ...n; j=1, 2, 3...x.

[0011] Further, the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a for the designed flow Q j is the regulation valve opening when t j ≥20 %, wherein, t j is the continuous stability rate of the actual flow in the designed regulation accuracy range.

[0012] Further, t j =T j / T 0j ×100%, Wherein, T j is continuous stability time (s) of the actual flow in the designed regulation accuracy range; T 0j is the set gas supply time (s) of the gas supply model designed flow Q j .

[0013] Further, the designed flow regulation accuracy R j =±(7.25-1.16ln(Q j )), Wherein, R j is the designed flow regulation accuracy; Q j is the gas supply model designed flow, Nm 3< / h.

[0014] Further, the pressure stabilization range: the pressure fluctuation ΔP of the gas collection pipe group no less than 0.4MPa and no more than 2.0MPa.

[0015] Compared with the prior art, the present disclosure can achieve at least one of the following beneficial effects: 1. The present disclosure adopts multiple main gas pipelines in parallel, which are gathered into the connected collecting pipe, and then communicated with branch gas pipelines through the transiting pipe for the distribution of the branch gas pipelines, wherein, the collecting group is many-to-one, that is, many gas source inlets in parallel correspond to one gas source outlet; the multiple gas sources in parallel are gathered through the collecting pipe and the connecting pipe after flowing out from the multiple main gas pipelines, and then flow into the transiting pipe through the gas outlet end of the collecting group; A collecting group can realize gathering and switching of multiple gas sources. 2. The method of the present disclosure establishes a regulation valve memory opening set of different designed flows under different gas supply branch gas pipeline pressures and main gas pipeline pressures in the gas supply model, and when performing the corresponding flow regulation and the collecting pipe group pressure regulation in the subsequent process, can quickly regulate the regulation valve in the gas supply valve group to the corresponding opening according to the data in the regulation valve memory opening set. The flow regulation speed of the regulation valve is ≤10s, the flow regulation accuracy range is ±1Nm 3< / h, and the flow stability coefficient is ≤0.02. Compared with the prior art, the speeds of the flow regulation and the pressure regulation are increased, and the accuracy is improved. 3. The method of the present disclosure establishes a regulation valve memory opening set of different design flows under different gas supply branch gas pipeline pressures and main gas pipeline pressures in the gas supply model, and when performing the corresponding flow regulation and collecting pipe group pressure regulation in subsequent process, updates the regulation valve memory opening set according to the regulation result, thereby ensuring the accuracy of the regulation of the gas supply valve group for the gas supply model.

[0016] In the present disclosure, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present disclosure will be described in the following description, and some of them will become apparent from the description, or will be understood by implementing the present disclosure. The purpose and other advantages of the present disclosure can be realized and obtained through the contents specially pointed out in the written description and the drawings.BRIEF DESCRIPTION OF DRAWINGS

[0017] The drawings are only for the purpose of showing specific embodiments, and are not considered to limit the application. In the whole drawing, the same reference symbols represent the same components. FIG. 1 is the structural diagram of the converter bottom blowing gas supply valve group provided in Embodiment 1 of the disclosure; FIG. 2 the planform of the converter bottom blowing gas supply valve group provided in Embodiment 1 of the disclosure.

[0018] Reference numerals are as follows: 1-main gas pipeline; 2-branch gas pipeline; 3-collecting group; 4-transiting pipe; 5-ditributing group; 6-connnecting pipe.DETAILED DESCRIPTION OF THE INVENTION

[0019] The preferred embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings, which form a part hereof, and which together with the embodiments of the present disclosure serve to explain the principles of the present disclosure, but is not used to limit the range of the present disclosure.

[0020] A converter bottom blowing gas supply valve group comprises main gas pipeline, branch gas pipeline, gas collecting pipe group; The gas collecting pipe group comprises collecting group, transiting pipe and distributing group; There are m main gas pipelines, which are connected in parallel. Each main gas pipeline is provided with main gas pipeline manual ball valve, main gas pipeline check valve, main gas pipeline pressure gauge, main gas pipeline cut-off valve, and main gas pipeline regulating valve; wherein, m=1-6, and m is an integer; There are n branch gas pipelines, which are connected in parallel. Each branch gas pipeline is provided with manual ball valve, check valve, pressure gauge, regulating valve, and flow meter; wherein, n=2-30, n is an integer; The collecting group comprises collecting pipe, connecting pipe and gas outlet end of the collecting group, the main gas pipeline is connected with the collecting pipes, and the collecting pipes are connected through flange and the connecting pipe; The distributing group comprises distributing pipe, connecting pipe, gas inlet end of the distributing group and n gas outlet ends of the distributing group; the branch gas pipeline is connected to the distributing pipe, and the distributing pipes are connected through flange and the connecting pipe.

[0021] The transiting pipe is an extended pipe of the gas outlet end of the collecting group, with one end connected to the gas outlet end of the collecting group and the other end connected to the gas inlet end of the distributing group through flange device, and realizes the communication between the main gas pipeline and the branch gas pipeline; the transiting pipe is provided with pressure gauge and thermometer.

[0022] It should be noted that the collecting group is many-to-one, that is, many gas source inlets in parallel correspond to one gas source outlet; the multiple gas sources in parallel are gathered through the collecting pipe and the connecting pipe after flowing out from the multiple main gas pipelines, and then flow into the transiting pipe through the gas outlet end of the collecting group; A collecting group can realize gathering and switching of 1-6 gas sources, which includes one or more of nitrogen, argon, air, oxygen, CO, CO 2 , CH 4 , C 2 H 4 and C 3 H 6 ; multiple parallel gas sources enter the gas inlet pipe of the distributing group after flowing into the transiting pipe, are distributed through multiple distributing pipes, and can flow out from multiple gas outlet ends of the distributing group.

[0023] The pipe diameter of the main gas pipeline is DN40-DN120, and the gas supply flow range is 100-5000Nm 3< / h; The pipe diameter of the branch gas pipeline is DN10-DN60, and the gas supply flow range is 100-500Nm 3< / h; The pipe diameters of the collecting pipe, the transiting pipe, the distributing pipe and the connecting pipe are respectively equal to the pipe diameter of the main gas pipeline, that is DN40-DN120.

[0024] The present disclosure also provides a stabilizing pressure adjustment method of converter bottom blowing gas supply valve group. The method is realized by the above converter bottom blowing gas supply valve group, and includes the following steps: Step1: setting stable pressure P and designed flow Q j of the gas collecting pipe group in gas supply model; Step 2: regulating the regulation valves of the main gas pipelines and the branch gas pipelines, when the actual flow of the gas supply valve group have reached the designed flow Q j and the pressure of the gas collecting group is in the range of the stable pressure, collecting the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under different main gas pipeline pressures and branch gas pipeline pressures for the designed flow Q j , and establishing the j-th flow memory opening set K j composed of the regulation valve memory opening set K ja under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Q j ; Step 3: establishing the set K composed of the j-th flow memory opening set K j ; Step 4: when the gas supply model performs switch between different designed flows, firstly according to the gas supply model designed flow Q j to be switched, in the set K, selecting the j-th flow memory opening set K j corresponding to Q j ; Step 5: according to the corresponding branch gas pipeline pressure P 1i and main gas pipeline pressure P 0i , selecting the regulation valve memory opening set K ja of the corresponding main gas pipeline and branch gas pipeline from the set K j ; Step 6: in the memory opening set K ja , establishing the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under corresponding main gas pipeline pressures and branch gas pipeline pressures for the designed flow Q j Step 7: controlling the regulation valves of the main gas pipeline and branch gas pipeline to be regulated to the memory opening K ai-j ; Step 8: after regulating the regulation valves of the main gas pipeline and the branch gas pipeline, measuring the actual flow Q j' and the collecting group pressure P'; Step 9: calculating the actual flow accuracy R j' according to the actual flow Q j , and calculating the pressure fluctuation ΔP of the gas collection pipe group according to the gas collection pipe group pressure P'; The gas supply model judges whether the actual flow Q j' is in a stable state and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range, and calculates the continuous stability rate of the actual flow Q j' in the range of the designed flow regulation accuracy R j ; Step 10: the gas supply model judges whether updating K ja , K j and K according update condition, if not, ending the regulation of the gas supply valve, or ending the regulation of the gas supply valve after updating.

[0025] Specifically, in the step 2, the stabilizing pressure range: the pressure fluctuation ΔP of the gas collection pipe group no less than 0.4MPa and no more than 2.0MPa.

[0026] Regulating the regulation valves of multiple main gas pipelines and branch gas pipelines, when the actual flow of the gas supply valve group has reached the designed flow Q j and the pressure of the gas collecting group is in the range of the stable pressure, firstly collecting the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline for the designed flow Q j under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a ; Establishing the memory opening set K 1a (a=1, 2, 3, ...n) of the designed flow Q 1 under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a ; The memory opening set K 1a is the memory opening set composed of the regulation valve memory opening of the corresponding main gas pipeline and branch gas pipeline, the memory opening of each main gas pipeline and branch gas pipeline is the regulation valve opening when t 1 ≥20%, wherein, t 1 is the continuous stability rate of the actual flow Q 1' in the designed flow regulation accuracy range R 1 , t 1 =T 1 / T 01 ×100%, T 1 is continuous stability time of Q 1' in the designed flow regulation accuracy range R 1 ; T 01 is the set gas supply time of the gas supply model designed flow Q 1 .

[0027] Wherein, R 1 =±(7.25-1.16ln(Q 1 )), the actual flow regulation accuracy R 1' =|(Q 1 -Q 1' ) / Q 1 |, if the actual flow regulation accuracy R 1' ≤ R 1 , indicating that R 1' is in the designed flow regulation accuracy range R 1 , and the actual flow Q 1' is in a stable state; If the actual flow regulation accuracy R 1' >R 1 , indicating that R 1' is not in the designed flow adjustment accuracy R 1 range, and the actual flow Q 1' is in a unstable state.

[0028] For example, K 11 is the memory opening set of the model designed flow Q 1 under the branch gas pipeline pressure P 11 and the main gas pipeline pressure P 01 , K 11 = {L 11-1 , L 12-1 , ...L 1i-1 , L 1(m+n)-1 }, wherein, i= 1, 2, 3, ...(m+n), L 1i-1 is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 11 and the main gas pipeline pressure P 01 for the model designed flow Q 1 ; K 12 is the memory opening set of the model designed flow Q 1 under the branch gas pipeline pressure P 12 and the main gas pipeline pressure P 02 , K 12 = {L 21-1 , L 22-1 , ...L 2i-1 , L 2(m+n)-1 }, wherein, L 2i-1 is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 12 and the main gas pipeline pressure P 02 for the model designed flow Q 1 ; K 13 is the memory opening set of the model designed flow Q 1 under the branch gas pipeline pressure P 13 and the main gas pipeline pressure P 03 , K 13 = {L 31-1 , L 32-1 , ...L 3i-1 , L 3(m+n)-i }, wherein, L 3i-1 is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 13 and the main gas pipeline pressure P 03 for the model designed flow Q 1 ; K 1a is the memory opening set of the model designed flow Q 1 under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a , K 1a = {L a1-1 , L a2-1 , ...L a1-1 , L a(m+n)-1 }, wherein, L ai-1 is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a for the model designed flow Q 1 ; Establishing the first flow memory opening set K 1 composed of the regulation valve memory opening set K 1a (a=1, 2, 3, ...n) under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Q 1 , wherein, K 1 = {K 11 , K 12 , .., K 1a , ..., K 1n }.

[0029] Similarly, establishing the memory opening set K 2a (a=1, 2, 3, ...n) of the gas supply model designed flow Q 2 under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a , K 2a = {L a1-2 , L a2-2 , ...L ai-2 , L a(m+n)-2 }, wherein, L ai-2 is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a for the model designed flow Q 2 ; Then, establishing the second flow memory opening set K 2 composed of the regulation valve memory opening set K 2a (a=1, 2, 3, ...n) under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Q 2 , wherein, K 2 ={K 21 , K 22 , .., K 2a , ..., K 2n }.

[0030] Similarly, establishing the memory opening set K ja (a=1, 2, 3, ...n; j=1, 2, 3, ...x) of the gas supply model designed flow Q j under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a , K ja = {L a1-j , L a2-j , ...L ai-j , L a(m+n)-j }, wherein, L ai-j is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P 1a and the main gas pipeline pressure P 0a for the model designed flow Q j ; Then, establishing the j-th flow memory opening set K j composed of the regulation valve memory opening set K ja (a=1, 2, 3, ...n) under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Q j , wherein, K j ={K j1 , K j2 , .., K ja , ..., K jn }.

[0031] The memory opening set K ja is the memory opening set composed of the regulation valve memory opening of the corresponding main gas pipeline and branch gas pipeline, the memory opening of each main gas pipeline and branch gas pipeline is the regulation valve opening when t j ≥20%, wherein, t j is the continuous stability rate of the actual flow Q j' in the designed flow regulation accuracy range R j , t j =T j / T 0j ×100%, T j is continuous stability time of Q j' in the designed flow regulation accuracy range R j ; T 0j is the set gas supply time of the gas supply model designed flow Q j ; Wherein, R j =±(7.25-1.16ln(Q j )), the actual flow regulation accuracy R j =|(Q j -Q j' ) / Q j |, if the actual flow regulation accuracy R j' ≤ R j , indicating that R j' is in the designed flow regulation accuracy range R j , and the actual flow Q j' is in a stable state; If the actual flow regulation accuracy R j' > R j , indicating that R j' is not in the designed flow adjustment accuracy range R j , and the actual flow Q j' is in a unstable state.

[0032] In the step3, establishing the set K composed of the j-th flow memory opening set K j , that is, the regulation valve memory opening set for each designed flow in the gas supply model under different gas supply branch pressures and main line pressures, wherein, K= {K 1 , K 2 , ..., K j , ..., K x }.

[0033] Specifically, in the step 9, the update conditions include: the gas supply model judges whether the actual flow regulation accuracy R j' is in the range of the designed flow regulation accuracy R j , the continuous stability rate t j of the actual flow is in the range of the designed flow regulation accuracy R j is ≥20%, and the pressure fluctuation ΔP of the gas collection pipe group in the stabilizing pressure range; If the actual flow regulation accuracy R j' ≤ the designed flow regulation accuracy R j , the continuous stability rate t j of the actual flow in the range of the designed flow regulation accuracy R j is ≥20%, and the pressure fluctuation ΔP of the gas collection pipe group is no less than 0.4MPa and no more than 2.0MPa, the actual flow Q j' is in a stable state and the collecting group is in a stable pressure state, no need to update K ja , K j and K, and ending flow regulation and stable pressure regulation of the gas supply valve.

[0034] If the actual flow regulation accuracy R j' ≤ the designed flow regulation accuracy R j , the continuous stability rate t j of the actual flow in the range of the designed flow regulation accuracy R j is ≥20%, but the pressure fluctuation ΔP of the gas collection pipe group does not meet the condition of no less than 0.4MPa and no more than 2.0MPa, the actual flow Q j' is in a stable state, but the collecting group is in an unstable pressure state, the gas supply model automatically controls the fine regulation of the regulation valve opening of some main gas pipeline and branch gas pipeline to make the pressure fluctuation ΔP of the gas collection pipe group meet the condition of no less than 0.4MPa and no more than 2.0MPa, recording the regulation valve opening of the corresponding main gas pipeline and branch gas pipeline, updating K ja , K j and K, and ending flow regulation and stable pressure regulation of the gas supply valve.

[0035] If the actual flow regulation accuracy R j' ≤ the designed flow regulation accuracy R j , but the continuous stability rate t j of the actual flow in the range of the designed flow regulation accuracy R j is <20% and the pressure fluctuation ΔP of the gas collection pipe group does not meet the condition of no less than 0.4MPa and no more than 2.0MPa, the actual flow Q j' is in an unstable state and the collecting group is in an unstable pressure state, the gas supply model automatically controls the fine regulation of the regulation valve opening of some main gas pipeline and branch gas pipeline, to make the continuous stability rate t j of the actual flow be ≥20% in the range of the designed flow regulation accuracy R j and the pressure fluctuation ΔP of the gas collection pipe group meet the condition of no less than 0.4MPa and no more than 2.0MPa, recording the regulation valve opening of the corresponding main gas pipeline and branch gas pipeline, updating K ja , K j and K, and ending flow regulation and stable pressure regulation of the gas supply valve.

[0036] If the actual flow regulation accuracy R j' > the designed flow regulation accuracy R j , the actual flow Q j' is in an unstable state. The gas supply model automatically controls the regulation of the regulation valve opening of some main gas pipeline and branch gas pipeline, to make the actual flow regulation accuracy R j' ≤ the designed flow regulation accuracy R j , the continuous stability rate t j of the actual flow be ≥20% in the range of the designed flow regulation accuracy R j , and the pressure fluctuation ΔP of the gas collection pipe group meet the condition of no less than 0.4MPa and no more than 2.0MPa; recording the regulation valve opening of the corresponding main gas pipeline and branch gas pipeline, updating K ja , K j and K, and ending flow regulation and stable pressure regulation of the gas supply valve.

[0037] The present invention designs a converter bottom blowing gas supply valve group and establishes a regulation valve memory opening set of different designed flows under different gas supply branch pressures and main line pressures in the gas supply model, which can quickly regulate the regulation valve in the gas supply valve group to corresponding opening according to the data in the regulation valve memory openings set when performing corresponding flow regulation in the subsequent process; The present invention has fast flow regulation speed and small the pressure fluctuation ΔP of the gas collection pipe group, which can achieve rapid pressure stabilization of the gas collecting group.Embodiment 1

[0038] This embodiment provides a converter bottom blowing gas supply valve group, which comprises main gas pipeline, branch gas pipeline and gas collecting pipe group, and is shown in FIG. 1.

[0039] The gas collecting pipe group comprises collecting group, transiting pipe and distributing group; There are 4 main gas pipelines, which are connected in parallel. Each main gas pipeline is provided with main gas pipeline manual ball valve, main gas pipeline check valve, main gas pipeline pressure gauge, main gas pipeline cut-off valve, and main gas pipeline regulating valve; There are 8 branch gas pipelines, which are connected in parallel. Each branch gas pipeline is provided with manual ball valve, check valve, pressure gauge, regulating valve, and flow meter; The collecting group comprises 4 collecting pipes, 1 connecting pipe and the gas outlet end of the collecting group, wherein, the 4 main gas pipelines are respectively connected with the 4 collecting pipes, the collecting pipes are connected through flange and the connecting pipes; The distributing group comprises 8 distributing pipes, 3 connecting pipes, gas inlet end of the distributing group and 8 gas outlet ends of the distributing group; the branch gas pipeline is connected to the distributing pipe, and the distributing pipes are connected through flange and the connecting pipe.

[0040] The transiting pipe is the extended pipe of the gas outlet end of the collecting group, with one end connected to the gas outlet end of the collecting group and the other end connected to the gas inlet end of the distributing group through flange device. The transiting pipe is provided with pressure gauge and thermometer.

[0041] It should be noted that the collecting group is four-to-one, that is, four gas source inlets in parallel correspond to one gas source outlet; the four gas sources in parallel are gathered through the collecting pipe and the connecting pipe after flowing out from four main gas pipelines, and then flow into the transiting pipe through the gas outlet end of the collecting group; A collecting group can realize gathering and switching of four gas sources; the four gas sources in parallel enter the gas inlet pipes of the distributing group after flowing into the transiting pipe, are distributed by the 8 distributing pipes, and flow out from the 8 gas outlet ends of the distributing group.

[0042] The pipe diameter of the main gas pipeline is DN40, and the gas supply flow is 100Nm 3< / h; The pipe diameter of the branch gas pipeline is DN10, and the gas supply flow range is 100Nm 3< / h; The pipe diameters of the collecting pipe, the transiting pipe, the distributing pipe and the connecting pipe are DN40, and equal to the pipe diameter of the main gas pipeline.Embodiment 2

[0043] This embodiment provides a stabilizing pressure adjustment method of a converter bottom blowing gas supply valve group, which is realized by a converter bottom blowing gas supply valve group similar to that in the embodiment 1; the gas supply valve group includes one main gas pipeline and six branch gas pipelines.

[0044] Including the following steps: Step1: setting stable pressure P and designed flow Q j of the gas collecting pipe group in the gas supply model; Wherein, the stable pressure P of the gas collecting pipe group is 1.5MPa, the designed flows of the gas supply model are respectively: Q 1 = 50 Nm 3 / h , Q 2 = 100 Nm 3 / h ; Step 2: regulating the regulation valves of multiple main gas pipelines and branch gas pipelines, when the actual flow of the gas supply valve group have reached the designed flow Q j and the pressure of the gas collecting group is in the range of the stable pressure, collecting the regulation valve memory opening L ai-j of the corresponding main gas pipeline and branch gas pipeline under different main gas pipeline pressures and branch gas pipeline pressures for the designed flow Q j , and establishing the j-th flow memory opening set K j composed of the regulation valve memory opening set K ja under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Q j ; When the pressure of the 6 branch gas pipelines is 0.3MPa and the pressure of the main gas pipeline is 1.5MPa, the regulation valve memory opening of the main gas pipeline of Q 1 (=50Nm 3< / h) is 30%, and the regulation valve memory opening of the 6 branch gas pipelines 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%, 31%}; When the pressure of the 6 branch gas pipelines is 0.8MPa and the pressure of the main gas pipeline is 1.5MPa, the regulation valve memory opening of the main gas pipeline of Q 1 (=50Nm 3< / h) is 35%, and the regulation valve memory opening of the 6 branch gas pipelines 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%, 36%}; K 1 is the first flow memory opening set composed of the regulation valve memory openings under different gas supply branch gas pipeline pressures for the gas supply model designed flow 50Nm 3< / h, K 1 ={K 11 , K 12 }; When the pressure of the 6 branch gas pipelines is 0.6MPa and the pressure of the main gas pipeline is 1.5MPa, the regulation valve memory opening of the main gas pipeline is 60%, and the regulation valve memory opening of the 6 branch gas pipelines of Q 2 (=100Nm 3< / h) is 61%; that is, the memory opening set K 21 , 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%, 61%}; When the pressure of the 6 branch gas pipelines is 1.1MPa and the pressure of the main gas pipeline is 1.5MPa, the regulation valve memory opening of the main gas pipeline of Q 1 (=100Nm 3< / h) is 65%, and the regulation valve memory opening of the 6 branch gas pipelines 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 25-2 , L 26-2 , L 27-2 }={65%, 66%, 66%, 66%, 66%, 66%, 66%}; K 2 is the first flow memory opening set composed of the regulation valve memory openings under different gas supply branch gas pipeline pressures for the gas supply model designed flow 100Nm 3< / h, K 2 ={K 21 , K 22 }; By calculating, the regulation accuracy R 1 =±(7.25-1.16ln(Q 1 )) corresponding to the gas supply model designed flow Q 1 is 2.71, similarly, R 2 =1.90; Step 3: establishing the set K composed of the j-th flow memory opening set K j ; K={K 1 , K 2 }; Step 4: when the gas supply model performs switch between different designed flows, firstly according to the gas supply model designed flow 50Nm 3< / h to be switched, in the set K, selecting the first flow memory opening set K 1 corresponding to 50Nm 3< / h; Step 5: according to the corresponding branch gas pipeline pressure P 11 (0.3MPa) and main gas pipeline pressure P 01 (1.5MPa), selecting the regulation valve memory opening set K 11 of the corresponding main gas pipeline and branch gas pipeline from the set K 1 ; Step 6: in the memory opening set K 11 , determining the regulation valve memory openings of the corresponding main gas pipeline and branch gas pipeline under corresponding main gas pipeline pressure and branch gas pipeline pressure for the designed flow Q 1 (50Nm 3< / h), wherein, the regulation valve memory openings including L 11-1 (30%), L 21-1 (31%), L 13-1 (31%), L 14-1 (31%), L 15-1 (31%), L 16-1 (31%), and L 17-1 (31%); Step 7: controlling the regulation valve memory openings of the main gas pipeline and the branch gas pipeline to be respectively regulated to L 11-1 (30%), L 21-1 (31%), L 13-1 (31%), L 14-1 (31%), L 15-1 (31%), L 16-1 (31%), and L 17-1 (31%); Step 8: after regulating the regulation valves of the main gas pipeline and the branch gas pipeline, measuring the actual flow Q j' and the collecting group pressure P'; Q1'=49Nm 3< / h, P'=2.0MPa; Step 9: according to the actual flow Q 1' (49Nm 3< / h), calculating the actual flow accuracy R 1' =0.02, meeting R 1' ≤ R 1 ; at the same time, the set gas supply time T 01 is 30s for the gas supply model designed flow 50Nm 3< / h(Q 1 ), the continuous stability time T1 of 49Nm 3< / h(Q1') is 10s in the regulation accuracy range R 1 , the continuous stable time t 1 =T 1 / T 01 ×100%=33.33%, meeting t 1 ≥20%, the actual flow Q1'(49Nm 3< / h) is in a stable state; According to the gas collection pipe group pressure P'=2.0MPa, calculating the pressure fluctuation ΔP=0.5MPa of the gas collection pipe group, meeting the condition of no less than 0.4MPa and no more than 2.0MPa, and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range.

[0045] Step 10: the gas supply model judges whether updating K ja , K j and K according update condition.

[0046] Because the actual flow regulation accuracy R 1' ≤ the designed flow regulation accuracy R 1 , the continuous stability rate t 1 of the actual flow in the designed flow regulation accuracy range R 1 is ≥20%, and the pressure fluctuation ΔP of the gas collection pipe group is no less than 0.4MPa and no more than 2.0MPa; the actual flow Q 1' is in a stable state and the collecting group is in a stable pressure state, no need to update K 11 , K 1 and K, and ending flow regulation and stabilizing pressure regulation of the gas supply valve; the regulation time is 10 s, the regulation accuracy is -1Nm 3< / h, and the flow stability coefficient is 0.02.

[0047] Similarly, according to the same steps, regulating flow for Q 1 (50Nm 3< / h) under the 6 branch gas pipelines pressure 0.8MPa and the main gas pipeline pressure 1.5MPa, and measuring the actual flow Q 1' , wherein, Q 1' =51Nm 3< / h; according to the actual flow Q 1' (51Nm 3< / h), calculating the corresponding accuracy R 1 =0.02, meeting R 1' ≤ R 1 ; at the same time, the set gas supply time T 01 is 30s for the gas supply model designed flow 50Nm 3< / h(Q 1 ), the 51Nm 3< / h(Q1') continuous stability time T 1 =12s in the regulation accuracy range R 1 , the continuous stable time t 1 =T 1 / T 01 ×100%=40%, meeting ≥20%, the actual flow Q1'(51Nm 3< / h) is in a stable state. According to the gas collection pipe group pressure P'=2.2MPa, calculating the pressure fluctuation ΔP=0.7MPa of the gas collection pipe group, meeting the condition of no less than 0.4MPa and no more than 2.0MPa, and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range. Because the actual flow regulation accuracy R 1' ≤ the designed flow regulation accuracy R 1 , the continuous stability rate t 1 of the actual flow in the designed flow regulation accuracy range R 1 is ≥20%, and the pressure fluctuation ΔP of the gas collection pipe group meets the condition of no less than 0.4MPa and no more than 2.0MPa; the actual flow Q 1' is in a stable state and the collecting group is in a stable pressure state, no need to update K 12 , K 1 and K, and ending flow regulation and stable pressure regulation of the gas supply valve; the regulation time is 8s, the regulation accuracy is 1Nm 3< / h, and the flow stability coefficient is 0.02.

[0048] Similarly, according to the same steps, regulating flow for Q 2 (50Nm 3< / h) under the 6 branch gas pipelines pressure 0.6MPa and the main gas pipeline pressure 1.5MPa, and measuring the actual flow Q 2' , wherein, Q 2' =99Nm 3< / h; according to the actual flow Q 2' (99Nm 3< / h), calculating the corresponding accuracy R 2' =0.02, meeting R 2' ≤ R 2 ; at the same time, the set gas supply time T 02 is 30s for the gas supply model designed flow 100Nm 3< / h(Q 2 ), the Q 2' (99Nm 3< / h) continuous stability time T 2 =8s in the regulation accuracy range R 2 , the continuous stable time t 2 =T 2 / T 02 ×100%=26.67%, meeting t 2 ≥20%, the actual flow Q 2' (99Nm 3< / h) is in a stable state. According to the gas collection pipe group pressure P'=2.1MPa, calculating the pressure fluctuation ΔP=0.6MPa of the gas collection pipe group, meeting the condition of no less than 0.4MPa and no more than 2.0MPa, and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range. Because the actual flow regulation accuracy R 2' ≤ the designed flow regulation accuracy R 2 , the continuous stability rate t 2 of the actual flow in the designed flow regulation accuracy range R 2 is ≥20%, and the pressure fluctuation ΔP of the gas collection pipe group meets the condition of no less than 0.4MPa and no more than 2.0MPa; the actual flow Q 2' is in a stable state and the collecting group is in a stable pressure state, no need to update K 21 , K 2 and K, and ending flow regulation and stable pressure regulation of the gas supply valve; the regulation time is 10s, the regulation accuracy is -1Nm 3< / h, and the flow stability coefficient is 0.01.

[0049] Similarly, according to the same steps, regulating flow for Q 2 (100Nm 3< / h) under the 6 branch gas pipelines pressure 1.1MPa and the main gas pipeline pressure 1.5MPa, and measuring the actual flow Q 2' , wherein, Q 2' =101Nm 3< / h; according to the actual flow Q 2' (101Nm 3< / h), calculating the corresponding accuracy R 2' =0.02, meeting R 2' ≤ R 2 ; at the same time, the set gas supply time T 02 is 30s for the gas supply model designed flow 100Nm 3< / h(Q 2 ), the Q 2' (101Nm 3< / h) continuous stability time T 2 =10s in the regulation accuracy range R 2 , the continuous stable time t 2 =T 2 / T 02 ×100%=33.33%, meeting t 2 ≥20%, the actual flow Q 2' (101Nm 3< / h) is in a stable state; According to the gas collection pipe group pressure P'=2.5MPa, calculating the pressure fluctuation ΔP=1.0MPa of the gas collection pipe group, meeting the condition of no less than 0.4MPa and no more than 2.0MPa, and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range. Because the actual flow regulation accuracy R 2' ≤ the designed flow regulation accuracy R 2 , the continuous stability rate t 2 of the actual flow in the designed flow regulation accuracy range R 2 is ≥20%, and the pressure fluctuation ΔP of the gas collection pipe group meets the condition of no less than 0.4MPa and no more than 2.0MPa; the actual flow Q 2' is in a stable state and the collecting group is in a stable pressure state, no need to update K 22 , K 2 and K, and ending flow regulation and stable pressure regulation of the gas supply valve; the regulation time is 10s, the regulation accuracy is 1Nm 3< / h, and the flow stability coefficient is 0.01.Comparative embodiment

[0050] This comparative embodiment adopts gas bag stabilizing pressure method to regulate flow of the gas supply valve group, which is the same to that in the embodiment, and includes the following steps: According to the designed flow set by the gas supply model, regulating the regulation valve under a certain gas supply branch pressure and main line pressure, and detecting whether the flow of the regulation valve is adjusted to the specified designed flow by flow meter; adjusting the regulation valve opening according to the flow regulation gradient, the flow regulation gradient is 5%-10%, and the regulation accuracy range is ±3Nm 3< / h; at the same time, gradually releasing the gas in the gas bag and regulating the pressure of the gas collecting group to make the pressure fluctuation ΔP of the gas collecting group meet 0.4MPa≤ΔP≤2.0MPa.

[0051] Wherein, the designed flow Q j respectively is Q 1 =50Nm 3< / h, Q 2 =100Nm 3< / h; Regulating flow under the 6 branch gas pipeline pressure 0.3MPa and the main gas pipeline pressure 1.5MPa when the designed flow is Q 1 (50Nm 3< / h), the flow of the regulation valve is 45Nm 3< / h detected by the flow meter, which is not in the required accuracy range; regulating the regulation valve according to the regulation gradient, wherein, the regulation gradient is 5%, and the flow of the regulation valve is 47.25Nm 3< / h detected by the flow meter, which is in the required accuracy range; gradually releasing the gas in the gas bag, and regulating the pressure of the gas collecting group to make the pressure fluctuation ΔP of the gas collecting group meet the condition of 0.4MPa≤ΔP≤2.0MPa, then ending the flow regulation. The regulation time is 40s, the regulation accuracy is -2.75Nm 3< / h, and the flow stability coefficient is 0.055.

[0052] Similarly, according to the same steps, regulating flow under the 6 branch gas pipeline pressure 0.8MPa and the main gas pipeline pressure 1.5MPa when the designed flow is Q 1 (50Nm 3< / h), the flow of the regulation valve is 44Nm 3< / h detected by the flow meter, which is not in the required accuracy range; regulating the regulation valve according to the regulation gradient, wherein, the regulation gradient is 5%, and the flow of the regulation valve is 46.2Nm 3< / h detected by the flow meter, which is in the required accuracy range; gradually releasing the gas in the gas bag, and regulating the pressure of the gas collecting group to make the pressure fluctuation ΔP of the gas collecting group meet the condition of 0.4MPa≤ΔP≤2.0MPa, then ending the flow regulation. The regulation time is 45s, the regulation accuracy is -1.49Nm 3< / h, and the flow stability coefficient is 0.029.

[0053] Similarly, according to the same steps, regulating flow under the 6 branch gas pipeline pressure 0.6MPa and the main gas pipeline pressure 1.5MPa when the designed flow is Q 2 (100Nm 3< / h), the flow of the regulation valve is 92Nm 3< / h detected by the flow meter, which is not in the required accuracy range; regulating the regulation valve according to the regulation gradient, wherein, the regulation gradient is 5%, and the flow of the regulation valve is 97.52Nm 3< / h detected by the flow meter, which is in the required accuracy range; gradually releasing the gas in the gas bag, and regulating the pressure of the gas collecting group to make the pressure fluctuation ΔP of the gas collecting group meet the condition of 0.4MPa≤ΔP≤2.0MPa, then ending the flow regulation. The regulation time is 35s, the regulation accuracy is -2.48Nm 3< / h, and the flow stability coefficient is 0.025.

[0054] Similarly, according to the same steps, regulating flow under the 6 branch gas pipeline pressure 1.1MPa and the main gas pipeline pressure 1.5MPa when the designed flow is Q 2 (100Nm 3< / h), the flow of the regulation valve is 95Nm 3< / h detected by the flow meter, which is not in the required accuracy range; regulating the regulation valve according to the regulation gradient, wherein, the regulation gradient is 8%, and the flow of the regulation valve is 102.6Nm 3< / h detected by the flow meter, which is in the required accuracy range; gradually releasing the gas in the gas bag, and regulating the pressure of the gas collecting group to make the pressure fluctuation ΔP of the gas collecting group meet the condition of 0.4MPa≤ΔP≤2.0MPa, then ending the flow regulation. The regulation time is 36s, the regulation accuracy is 2.6Nm 3< / h, and the flow stability coefficient is 0.026; It can be seen from the embodiment and the comparative embodiment that the method of the present invention regulates the flow of the gas supply valve group and stabilizes the pressure of the collecting group, which makes the flow regulation time ≤10s, the flow regulation accuracy ±1Nm 3< / h, and the flow stability coefficient ≤0.02; the existing process for regulating the flow of the gas supply valve group and the pressure of the collecting group makes the flow regulation time 30-50s, the flow adjustment accuracy ±3Nm 3< / h, and the flow stability coefficient ≤0.055; Compared with the existing method, the method of the present invention can realize fast gas supply regulation speed and stabilizing pressure speed in the gas supply flow regulation process of the gas supply valve group.

[0055] The above is only preferred embodiments of the present disclosure, but the scope of the present disclosure is not limited thereto, and any modification or substitution that can be easily conceived by those skilled in the art within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A converter bottom blowing gas supply valve group, <b>characterized in that it comprises main gas pipelines, branch gas pipelines, and gas collecting pipe groups; each of the gas collecting pipe groups comprises collecting groups, a transiting pipe and distributing groups; there are m main gas pipelines, which are connected in parallel, and each main gas pipeline is provided with main gas pipeline manual ball valves, a main gas pipeline check valve, main gas pipeline pressure gauges, a main gas pipeline cut-off valve, and a main gas pipeline regulating valve; there are n branch gas pipelines, which are connected in parallel, and each branch gas pipeline is provided with manual ball valves, a check valve, pressure gauges, a regulating valve, and a flow meter.

2. The converter bottom blowing gas supply valve group according to claim 1, wherein each of the collecting groups comprises collecting pipes, connecting pipes and gas outlet ends of the collecting groups, the main gas pipelines are connected with one of the collecting pipes, and the collecting pipes are connected through flanges and the connecting pipes; each of the distributing groups comprises distributing pipes, connecting pipes, gas inlet end of the distributing group and n gas outlet ends of the distributing group; the branch gas pipelines are connected to the distributing pipes, and the distributing pipes are connected through flanges and the connecting pipes.

3. The converter bottom blowing gas supply valve group according to claim 2, wherein the transiting pipe is an extended pipe of the gas outlet ends of the collecting groups, with one end connected to the gas outlet ends of the collecting groups and the other end connected to gas inlet ends of the distributing groups through flange devices; the transiting pipe is provided with pressure gauges and a thermometer.

4. The converter bottom blowing gas supply valve group according to claim 3, wherein a pipe diameter of each of the main gas pipelines is DN40-DN120, and a gas supply flow range is 100-5000Nm3 / h; a pipe diameter of each of the branch gas pipelines is DN10-DN60, and a gas supply flow range is 100-500Nm3 / h.

5. A stabilizing pressure adjustment method of converter bottom blowing gas supply valve group, used for the converter bottom blowing gas supply valve group mentioned in any one of claims 1-4, and <b>characterized in that it comprises the following steps: step1: setting stable pressure P and designed flow Qj of the gas collecting pipe group in a gas supply model; step 2: regulating regulation valves of the main gas pipelines and the branch gas pipelines, when actual flow of the gas supply valve group have reached the designed flow Qj and pressure of the gas collecting group is in the range of the stable pressure, collecting regulation valve memory opening Lai-j of corresponding one of the main gas pipelines and one of the branch gas pipelines under different main gas pipeline pressures and branch gas pipeline pressures for the designed flow Qj, and establishing a j-th flow memory opening set Kj composed of regulation valve memory opening set Kja under different branch gas pipeline pressures and main gas pipeline pressures for the gas supply model designed flow Qj; step 3: establishing a set K composed of the j-th flow memory opening set Kj; step 4: when the gas supply model performs switch between different designed flows, firstly according to the gas supply model designed flow Qj to be switched, in the set K, selecting the j-th flow memory opening set Kj corresponding to Qj; step 5: according to corresponding branch gas pipeline pressure P1i and main gas pipeline pressure P0i, selecting the regulation valve memory opening set Kja of the corresponding one of the main gas pipelines and one of the branch gas pipelines from the set Kj; step 6: in the memory opening set Kja, establishing the regulation valve memory opening Lai-j of the corresponding one of the main gas pipelines and one of the branch gas pipelines under corresponding main gas pipeline pressures and branch gas pipeline pressures for the designed flow Qj; step 7: controlling the regulation valves of the main gas pipelines and branch gas pipelines to be regulated to the memory opening Kai-j; step 8: after regulating the regulation valves of the main gas pipelines and the branch gas pipelines, measuring actual flow Qj, and collecting group pressure P'; step 9: calculating actual flow accuracy Rj, according to the actual flow Qj, and calculating pressure fluctuation ΔP of the gas collection pipe group according to the gas collection pipe group pressure P'; the gas supply model judges whether the actual flow Qj' is in a stable state and the pressure fluctuation ΔP of the gas collection pipe group is in the stable pressure range, and calculates continuous stability rate of the actual flow Qj' in the range of designed flow regulation accuracy Rj; step 10: the gas supply model judges whether updating Kja, Kj and K according update condition, if not, ending the regulation of the gas supply valve, or ending the regulation of the gas supply valve after updating.

6. The stabilizing pressure adjustment method of converter bottom blowing gas supply valve group according to claim 5, wherein the step 2 comprises: collecting the regulation valve memory opening Lai-j of the corresponding main gas pipeline and branch gas pipeline under the branch gas pipeline pressure P1a and the main gas pipeline pressure P0a for the designed flow Qj; establishing the memory opening set Kja of the gas supply model designed flow Qj under the branch gas pipeline pressure P1a and the main gas pipeline pressure P0a, Kja={La1-j, La2-j, ..., Lai-j, ..., La(m+n)-j}, wherein, Lai-j is the regulation valve memory opening of a main gas pipeline or a branch gas pipeline under the branch gas pipeline pressure P1a and the main gas pipeline pressure P0a for the gas supply model designed flow Qj, a=1, 2, 3, ...n; j=1, 2, 3 ...x; establishing the j-th flow memory opening set Kj composed of the regulation valve memory opening set Kja under the branch air pressure P1a and the main air pressure P0a for the gas supply model designed flow Qj, wherein, Kj={Kj1, Kj2, .., Kja, ..., Kjn}, a=1, 2, 3, ...n; j=1, 2, 3...x.

7. The stabilizing pressure adjustment method of converter bottom blowing gas supply valve group according to claim 6, wherein, the regulation valve memory opening Lai-j of the corresponding main gas pipeline and branch gas pipeline under the branch gas pipeline pressure P1a and the main gas pipeline pressure P0a for the designed flow Qj is the regulation valve opening when tj ≥ 20 % , wherein, tj is the continuous stability rate of the actual flow in the designed regulation accuracy range.

8. The stabilizing pressure adjustment method of converter bottom blowing gas supply valve group according to claim 7, wherein tj=Tj / T0j×100%, wherein, Tj is continuous stability time of the actual flow in the designed regulation accuracy range, s; T0j is the set gas supply time of the gas supply model designed flow Qj, s.

9. The stabilizing pressure adjustment method of converter bottom blowing gas supply valve group according to claim 8, wherein the designed flow regulation accuracy Rj=±(7.25-1.16ln(Qj)), wherein, Rj is the designed flow regulation accuracy; Qj is the gas supply model designed flow, Nm3 / h10. The stabilizing pressure adjustment method of converter bottom blowing gas supply valve group according to claim 9, wherein the stabilizing pressure range: the pressure fluctuation ΔP of the gas collection pipe group is no less than 0.4MPa and no more than 2.0MPa.

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