High-turndown-ratio flow control valve group for bottom blowing in converter and gas supply method

Abstract

A high-turndown-ratio flow control valve group for bottom blowing in a converter, comprising a main line and branch lines. The main line comprises a main line gas supply pipe, a ball valve (5), a check valve (4), a regulating valve (2), a cut-off valve (1) and a pressure gauge (3); the number of the branch lines is N, and each branch line comprises a bypass gas supply pipe, a low-flow gas supply pipe and a high-flow gas supply pipe; the bypass gas supply pipe is manually controlled to open and close, and a needle valve (8) and a ball valve are arranged on the bypass gas supply pipe; the low-flow gas supply pipe is automatically controlled to open and close, and a ball valve, a check valve, a flow controller (7) and a pressure gauge are arranged on the low-flow gas supply pipe; the high-flow gas supply pipe is automatically controlled to open and close, and a ball valve, a regulating valve, a check valve, a flow meter (6) and a pressure gauge are arranged on the high-flow gas supply pipe; the main line is connected in series to the plurality of branch lines to control the regulation of the total flow of all the branch lines; the plurality of branch lines are connected in parallel, and each branch line independently supplies gas. Also disclosed is a gas supply method using the valve group.

Description

A high-turndown ratio flow control valve group and gas supply method for converter bottom blowing Technical Field

[0001] The present application relates to the technical field of iron and steel metallurgy, and in particular to a high-regulation ratio flow control valve group and a gas supply method for bottom blowing of a converter. 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] The traditional converter bottom blowing gas supply valve group uses a regulating valve or flow controller to adjust and control the gas flow. Due to the influence of the adjustment accuracy, the adjustment ratio of the regulating valve is generally 10:1, that is, the maximum flow is 10 times the minimum flow; due to the influence of the adjustment range and equipment price, the flow adjustment range of the flow controller is generally 200Nm 3 / h or less; therefore, it is difficult for the existing gas supply valve group and gas supply method to achieve high regulation ratio flow regulation within a large flow range.

[0004] Summary of the Invention

[0005] In view of the above analysis, the embodiments of the present application aim to provide a high-regulation ratio flow control valve group and gas supply method for converter bottom blowing, so as to solve the problem that the flow regulation ratio of the existing converter bottom blowing gas supply valve group is small and it is difficult to achieve high-regulation ratio flow regulation within a large flow range.

[0006] The purpose of this application is mainly achieved through the following technical solutions:

[0007] On the one hand, the present application provides a high turndown ratio flow control valve group for converter bottom blowing, comprising a main circuit and a branch circuit;

[0008] The main circuit is connected in series with a plurality of branch circuits, and the plurality of branch circuits are connected in parallel;

[0009] The main line includes a main air supply pipe, a ball valve, a check valve, a regulating valve, a shut-off valve, and a pressure gauge; the shut-off valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are sequentially arranged on the main air supply pipe;

[0010] The number of the branches is N, and each branch includes a bypass air supply pipe, a low-flow air supply pipe, and a high-flow air supply pipe;

[0011] The bypass air supply pipe is manually opened and closed, and a needle valve and a ball valve are provided on the bypass air supply pipe;

[0012] The low-flow gas supply pipe is automatically opened and closed, and a ball valve, a check valve, a flow controller, and a pressure gauge are provided on the low-flow gas supply pipe;

[0013] The high-flow air supply pipe is automatically controlled to open and close, and a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are arranged on the high-flow air supply pipe.

[0014] Furthermore, the diameter of the main air supply pipe is DN60~DN200, the diameter of the bypass air supply pipe is DN20~DN40, the diameter of the low-flow air supply pipe is DN20~DN40, and the diameter of the high-flow air supply pipe is DN40~DN60.

[0015] Furthermore, the maximum air flow rate Q of the low-flow air supply pipe is 低max 100Nm 3 / h, the maximum air supply flow rate Q of the high-flow air supply pipe 高max 1000Nm 3 / h.

[0016] On the other hand, the present application also provides a gas supply method for a high turndown ratio flow control valve group for converter bottom blowing, which is implemented by the above-mentioned control valve group and includes the following steps:

[0017] Step 1: Determine the size of the designed air supply flow rate q of the i-th branch set in the air supply model, the maximum air supply value of the i-th branch low-flow air supply pipeline, and the maximum air supply value of the i-th branch high-flow air supply pipeline;

[0018] Step 2: Determine the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline based on the minimum gas supply value and the maximum gas supply value of the i-th branch low-flow gas supply pipeline and the minimum gas supply value and the maximum gas supply value of the i-th branch high-flow gas supply pipeline, and determine the adjustment ratio based on the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline;

[0019] Step 3: Compare the designed air supply flow rate q of the i-th branch and the maximum air supply value of the i-th branch low-flow air supply pipeline, and the designed air supply flow rate q of the i-th branch and the maximum air supply value of the i-th branch high-flow air supply pipeline. Determine the air supply principle based on the comparison results, and select the air supply pipeline to supply air to the i-th branch based on the air supply principle:

[0020] Step 4: According to the air supply line of the i-th branch determined in step 3, adjust the flow of the air supply line of the i-th branch so that the difference between the actual air supply flow of the i-th branch and the designed air supply flow q is ≤ 0.5Nm 3 / h;

[0021] Step 5: According to steps 1 to 4, adjust the flow of other air supply branches so that the difference between the actual air supply flow and the designed air supply flow is ≤ 0.5Nm 3 / h.

[0022] Furthermore, in step 2, the implementation principle of the adjustment ratio includes:

[0023] When the gas flow rate Q of the low flow gas supply pipeline 低 =1~10Nm 3 / h, adjust the gas flow Q of the high-flow gas supply pipeline 高 =10~100Nm 3 / h, the total flow of the valve group can be achieved in the range of 1 to 110 Nm 3 / h range, flow control and regulation with a regulation ratio of 1:100;

[0024] When the gas flow rate Q of the low flow gas supply pipeline 低 =2~20Nm 3 / h, adjust the gas flow Q of the high-flow gas supply pipeline 高 =20~200Nm 3 / h, the total flow of the valve group can be achieved in the range of 2 to 220 Nm 3 / h range, with a flow rate control and regulation ratio of 1:100.

[0025] Furthermore, in step 2, the implementation principle of the adjustment ratio also includes:

[0026] When the gas flow rate Q of the low flow gas supply pipeline 低 =3~30Nm 3 / h, adjust the gas flow Q of the high-flow gas supply pipeline 高 =30~300Nm 3 / h, the total flow of the valve group can be achieved in the range of 3 to 330 Nm 3 / h range, flow control and regulation with a regulation ratio of 1:100;

[0027] When the gas flow rate Q of the low flow gas supply pipeline 低 =4~40Nm 3 / h, adjust the gas flow Q of the high-flow gas supply pipeline 高 =40~400Nm 3 / h, the total flow of the valve group can be achieved in the range of 4 to 440 Nm 3 / h range, with a flow rate control and regulation ratio of 1:100.

[0028] Furthermore, in step 2, the implementation principle of the adjustment ratio also includes:

[0029] When the gas flow rate Q of the low flow gas supply pipeline 低 =5~50Nm 3 / h, adjust the gas flow Q of the high-flow gas supply pipeline 高 =50~500Nm 3 / h, the total flow of the valve group can be 5~550Nm 3 / h range, flow control and regulation with a regulation ratio of 1:100;

[0030] When the gas flow rate Q of the low flow gas supply pipeline 低 =10~100Nm 3 / h, adjust the gas flow Q of the high-flow gas supply pipeline 高 =100~1000Nm 3 / h, the total flow of the valve group can be between 10 and 1100 Nm 3 / h range, with a flow rate control and regulation ratio of 1:100.

[0031] Furthermore, in step 3, the gas supply principle includes:

[0032] When q≤Q 低max , select the low-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0033] Where q is the designed air supply flow rate of the i-th branch, Nm 3 / h;

[0034] Q 低max is the maximum air supply value of the low-flow air supply pipeline of the i-th branch, Nm 3 / h.

[0035] Furthermore, in step 3, the gas supply principle also includes:

[0036] When Q 低max <q≤Q 高max , select the high-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0037] Among them, Q 高max Maximum air supply value of the high-flow air supply pipeline of the i-th branch, Nm 3 / h.

[0038] Furthermore, in step 3, the gas supply principle also includes:

[0039] When Q 高max ≤q≤Q 低max +Q 高max , select the high flow gas supply line to fully open, the low flow gas supply line according to |q-(Q 高max +Q 低max )|For flow regulation, the high-flow gas supply pipe and the low-flow gas supply pipe together serve as the gas supply pipe of the i-th branch.

[0040] Compared with the prior art, this application can achieve at least one of the following beneficial effects:

[0041] 1. The flow control valve group of the present application includes a main line and a branch line. Each branch line includes a bypass air supply pipe, a low-flow air supply pipe, and a high-flow air supply pipe. Through the coordination of the low-flow air supply pipe and the high-flow air supply pipe, the flow rate can be accurately controlled and adjusted with a regulation ratio of 1:100 within the large-flow air supply range of the valve group.

[0042] 2. The air supply method of the present application determines the air supply principle by comparing the designed air supply flow q of the i-th branch and the maximum air supply value of the i-th branch low-flow air supply pipeline, and the designed air supply flow q of the i-th branch and the maximum air supply value of the i-th branch high-flow air supply pipeline. According to the air supply principle, the air supply pipeline of the i-th branch can be accurately selected to achieve precise control and regulation of the flow with a regulation ratio of 1:100 within the large-flow air supply range of the valve group.

[0043] 3. The air supply method of this application realizes the precise control and regulation of the flow rate with a regulation ratio of 1:100 within the large flow supply range of the valve group. At the same time, the difference between the actual air supply flow rate of the valve group and the designed air supply flow rate is ≤0.5Nm 3 / h, with higher adjustment accuracy.

[0044] 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

[0045] 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.

[0046] FIG1 is a schematic diagram of a flow control valve assembly according to Example 1 of the present application;

[0047] FIG2 is a schematic diagram of the gas supply method process of the present application.

[0048] Reference numerals:

[0049] 1- Main line shut-off valve; 2- Main line regulating valve; 3- Main line pressure gauge; 4- Main line check valve; 5- Main line ball valve; 6- Flow meter installed on the high-flow air supply pipe of the first branch; 7- Flow controller installed on the low-flow air supply pipe of the first branch; 8- Needle valve installed on the bypass air supply pipe of the first branch; A- Main line; B- Branch line; B-1- First branch line; B-2- Second branch line; B-3- Third branch line; Q-1- High-flow air supply pipe of the first branch line; Q-2- Low-flow air supply pipe of the first branch line; Q-3- Bypass air supply pipe of the first branch line. DETAILED DESCRIPTION

[0050] 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.

[0051] The present application provides a high turndown ratio flow control valve group for converter bottom blowing, comprising a main circuit and a branch circuit;

[0052] The main line includes a main air supply pipe, a ball valve, a check valve, a regulating valve, a shut-off valve, and a pressure gauge; the shut-off valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are sequentially arranged on the main air supply pipe to supply air in a wide flow range to all branches;

[0053] The number of the branches is N, and each branch includes a bypass air supply pipe, a low-flow air supply pipe, and a high-flow air supply pipe;

[0054] The bypass air supply pipe is manually controlled to open and close, and a needle valve and a ball valve are provided on the bypass air supply pipe to meet the air supply needs when the valve group is in an abnormal working state;

[0055] The low-flow gas supply pipe is automatically opened and closed, and a ball valve, a check valve, a flow controller, and a pressure gauge are provided on the low-flow gas supply pipe;

[0056] The high-flow gas supply pipe is automatically opened and closed, and a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are provided on the high-flow gas supply pipe;

[0057] The main road is connected in series with multiple branches to control the regulation of the total flow of all branches;

[0058] The multiple branches are connected in parallel, and each branch supplies gas independently.

[0059] The diameter of the main air supply pipe is DN60~DN200, the diameter of the bypass air supply pipe is DN20~DN40, the diameter of the low-flow air supply pipe is DN20~DN40, and the diameter of the high-flow air supply pipe is DN40~DN60.

[0060] The maximum air flow rate of the low-flow air supply pipeline is 100Nm 3 / h, the minimum air flow rate of the high-flow air supply pipeline is 20Nm 3 / h, the maximum air flow rate of the high-flow air supply pipeline is 1000Nm 3 / h.

[0061] The present application also provides a gas supply method for a high turndown ratio flow control valve group for converter bottom blowing, which is implemented by the above-mentioned flow control valve group and includes the following steps:

[0062] Step 1: Determine the size of the designed air supply flow rate q of the i-th branch set in the air supply model, the maximum air supply value of the i-th branch low-flow air supply pipeline, and the maximum air supply value of the i-th branch high-flow air supply pipeline;

[0063] Step 2: Determine the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline based on the minimum gas supply value and the maximum gas supply value of the i-th branch low-flow gas supply pipeline and the minimum gas supply value and the maximum gas supply value of the i-th branch high-flow gas supply pipeline, and determine the adjustment ratio based on the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline;

[0064] Step 3: Compare the designed air supply flow rate q of the i-th branch and the maximum air supply value of the i-th branch low-flow air supply pipeline, and the designed air supply flow rate q of the i-th branch and the maximum air supply value of the i-th branch high-flow air supply pipeline, determine the air supply principle, and select the air supply pipeline to supply air to the i-th branch according to the air supply principle:

[0065] Step 4: According to the air supply line of the i-th branch determined in step 3, adjust the flow of the air supply line of the i-th branch so that the difference between the actual air supply flow of the i-th branch and the designed air supply flow q is ≤ 0.5Nm 3 / h;

[0066] Step 5: According to steps 1 to 4, adjust the flow of other air supply branches so that the difference between the actual air supply flow and the designed air supply flow is ≤ 0.5Nm 3 / h.

[0067] Specifically, in step 1, the value range of i is 1 to N, where N is an integer;

[0068] Specifically, in step 2, the implementation principles of the adjustment ratio include:

[0069] When the gas flow rate Q of the low flow gas supply pipeline 低 =1~10Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =10~100Nm 3 / h, the total flow of the valve group can be achieved in the range of 1 to 110 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100;

[0070] When the gas flow rate Q of the low flow gas supply pipeline 低 =2~20Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =20~200Nm 3 / h, the total flow of the valve group can be achieved in the range of 2 to 220 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100;

[0071] When the gas flow rate Q of the low flow gas supply pipeline 低 =3~30Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =30~300Nm 3 / h, the total flow of the valve group can be achieved in the range of 3 to 330 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100;

[0072] When the gas flow rate Q of the low flow gas supply pipeline 低 =4~40Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =40~400Nm 3 / h, the total flow of the valve group can be achieved in the range of 4 to 440 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100;

[0073] When the gas flow rate Q of the low flow gas supply pipeline 低 =5~50Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =50~500Nm 3 / h, the total flow of the valve group can be 5~550Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100;

[0074] When the gas flow rate Q of the low flow gas supply pipeline 低 =10~100Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =100~1000Nm 3 / h, the total flow of the valve group can be between 10 and 1100 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100.

[0075] Specifically, in step 3, the designed air supply flow rate q of the i-th branch is compared with the maximum air supply value Q of the i-th branch low-flow air supply pipeline. 低max , the i-th branch design air supply flow q and the i-th branch high flow air supply pipeline maximum air supply value Q 高max The size of the gas supply principle is determined, and the gas supply pipeline is selected as the i-th branch for gas supply according to the gas supply principle. The gas supply principle is:

[0076] When q≤Q 低max , select the low-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0077] When Q低max <q≤Q 高max , select the high-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0078] When Q 高max ≤q≤Q 低max +Q 高max , select the high flow gas supply line to fully open, the low flow gas supply line according to |q-(Q 高max +Q 低max )|For flow regulation, the high-flow gas supply pipe and the low-flow gas supply pipe together serve as the gas supply pipe of the i-th branch.

[0079] Through the above-mentioned flow control valve group and gas supply method, the present application can achieve precise regulation and control of the flow rate within a large flow range and a flow regulation ratio of up to 1:100 during the converter smelting process.

[0080] Example 1

[0081] This embodiment provides a high turndown ratio flow control valve group for converter bottom blowing, as shown in FIG1 , including a main circuit and a branch circuit;

[0082] The main line is shown as A in Figure 1, and includes a main air supply pipe, a ball valve, a check valve, a regulating valve, a shut-off valve, and a pressure gauge. Along the air supply direction, the shut-off valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are sequentially arranged on the main air supply pipe to supply air in a wide flow range to all branches.

[0083] The number of the branches is N, which is shown as Bi (i=1, 2, 3...N) in FIG1 , and each branch includes a bypass air supply pipe (Q-3), a low-flow air supply pipe (Q-2), and a high-flow air supply pipe (Q-1);

[0084] The bypass air supply pipe is manually controlled to open and close, and a needle valve and a ball valve are provided on the bypass air supply pipe to meet the air supply needs when the valve group is in an abnormal working state;

[0085] The low-flow gas supply pipe is automatically opened and closed, and a ball valve, a check valve, a flow controller, and a pressure gauge are provided on the low-flow gas supply pipe;

[0086] The high-flow gas supply pipe is automatically opened and closed, and a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are provided on the high-flow gas supply pipe;

[0087] The main road is connected in series with multiple branches to control the regulation of the total flow of all branches;

[0088] The multiple branches are connected in parallel, and each branch supplies gas independently.

[0089] The diameter of the main air supply pipe is DN60~DN200, the diameter of the bypass air supply pipe is DN20~DN40, the diameter of the low-flow air supply pipe is DN20~DN40, and the diameter of the high-flow air supply pipe is DN40~DN60.

[0090] Low flow air supply line range is 1~10Nm 3 / h, the flow range of high flow air supply pipe is 10~100Nm 3 / h.

[0091] Example 2

[0092] In this embodiment, the air supply flow rate q of the i-th branch of the air supply model is divided into 6 flow segments, namely 1Nm 3 / h, 5Nm 3 / h, 20Nm 3 / h, 50Nm 3 / h, 100Nm 3 / h, 105Nm 3 / h.

[0093] Supplying gas through the flow control valve group of Example 1 includes the following steps:

[0094] Step 1: Determine the size of the designed air supply flow rate q of the i-th branch set in the air supply model, the air supply range of the i-th branch low-flow air supply pipeline, and the air supply range of the i-th branch high-flow air supply pipeline;

[0095] In the first flow section, q = 1Nm 3 / h;

[0096] The second flow range, q = 5Nm 3 / h;

[0097] The third flow range, q = 20Nm 3 / h;

[0098] The fourth flow range, q = 50Nm 3 / h;

[0099] Fifth flow section, q = 100 Nm 3 / h;

[0100] The sixth flow range, q = 105 Nm 3 / h;

[0101] The gas supply range of the low-flow gas supply pipeline of the i-th branch is 1~10Nm 3 / h;

[0102] The gas supply range of the high-flow gas supply pipeline of the i-th branch is 10~100Nm 3 / h;

[0103] Step 2: Determine the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline based on the minimum gas supply value and the maximum gas supply value of the i-th branch low-flow gas supply pipeline and the minimum gas supply value and the maximum gas supply value of the i-th branch high-flow gas supply pipeline, and determine the adjustment ratio based on the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline;

[0104] When the gas flow rate Q of the low flow gas supply pipeline 低 =1~10Nm 3 / h, gas flow rate Q of high flow gas supply pipeline 高 =10~100Nm 3 / h, the total flow of the valve group can be achieved in the range of 1 to 110 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100; that is: Q 低max =10Nm 3 / h,Q 高max =100Nm 3 / h.

[0105] Step 3: Compare the designed air supply flow rate q of the i-th branch and the maximum air supply value of the i-th branch low-flow air supply pipeline, and the designed air supply flow rate q of the i-th branch and the maximum air supply value of the i-th branch high-flow air supply pipeline. Determine the air supply principle based on the comparison results, and select the air supply pipeline to supply air to the i-th branch based on the air supply principle:

[0106] First flow section: q = 1 Nm 3 / h,q≤Q 低max , select the low-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0107] The second flow range, q = 5Nm 3 / h,q<Q 低max , select the low-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0108] The third flow range, q = 20Nm 3 / h,Q 低max <q<Q 高max , select the high-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0109] The fourth flow range, q = 50Nm 3 / h,Q 低max <q<Q 高max , select the high-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0110] Fifth flow section, q = 100 Nm 3 / h,q≤Q 高max , select the high-flow gas supply pipeline as the gas supply pipeline of the i-th branch;

[0111] The sixth flow range, q = 105 Nm 3 / h,Q 高max ≤q≤Q 低max +Q 高max , select the high flow gas supply line to fully open, the low flow gas supply line according to |q-(Q 高max +Q 低max )| Flow regulation is performed, and the high-flow gas supply pipe and the low-flow gas supply pipe together serve as the gas supply pipe of the i-th branch;

[0112] Step 4: According to the air supply line of the i-th branch determined in step 3, adjust the flow of the air supply line of the i-th branch so that the difference between the actual air supply flow of the i-th branch and the designed air supply flow q is ≤ 0.5Nm 3 / h;

[0113] First flow section: Select the low-flow air supply pipeline as the air supply pipeline of the i-th branch, adjust the flow of the i-th branch air supply pipeline, and the actual air supply flow of the i-th branch is 1.05Nm 3 / h;

[0114] In the second flow section, the low-flow air supply pipeline is selected as the air supply pipeline of the i-th branch, and the flow of the i-th branch air supply pipeline is adjusted. The actual air supply flow of the i-th branch is 1.05Nm 3 / h;

[0115] In the third flow segment, the high-flow gas supply pipeline is selected as the gas supply pipeline of the i-th branch, and the flow of the i-th branch gas supply pipeline is adjusted. The actual gas supply flow of the i-th branch is 5.1Nm 3 / h;

[0116] In the fourth flow segment, the high-flow air supply pipeline is selected as the air supply pipeline of the i-th branch, and the flow of the i-th branch air supply pipeline is adjusted. The actual air supply flow of the i-th branch is 49.5Nm 3 / h;

[0117] In the fifth flow segment, the high-flow air supply pipeline is selected as the air supply pipeline of the i-th branch, and the flow of the i-th branch air supply pipeline is adjusted. The actual air supply flow of the i-th branch is 99.5Nm 3 / h;

[0118] In the sixth flow section, the high flow gas supply line is fully opened, and the low flow gas supply line is opened according to |q-(Q 高max +Q 低max )|(i.e. 5Nm 3 / h) to adjust the flow rate. The actual gas flow rate of the high-flow gas supply pipeline is 99.5Nm3 / h, and the actual gas flow rate of the low-flow gas supply pipeline is 5.6Nm 3 / h, the total actual air supply flow of the i-th branch is 105.1Nm 3 / h.

[0119] Step 4: According to steps 1 to 3, adjust the flow of other air supply branches so that the difference between the actual air supply flow and the designed air supply flow is ≤ 0.5Nm 3 / h.

[0120] This embodiment can achieve a total flow rate of the valve group of 1 to 110 Nm 3 / h range, precise control and regulation of flow rate with a regulation ratio of 1:100.

[0121] 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 high regulation ratio flow control valve group for bottom blowing of a converter, characterized in that, It includes a main road and branch roads; The main road is connected in series with multiple branch roads, and the multiple branch roads are connected in parallel; The main road includes a main road gas supply pipe, a ball valve, a check valve, a regulating valve, a cut-off valve, and a pressure gauge; the cut-off valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are arranged on the main road gas supply pipe in sequence; The number of the branch roads is N, and each branch road includes a bypass gas supply pipe, a low-flow gas supply pipe, and a high-flow gas supply pipe; The bypass gas supply pipe is manually controlled to open and close, and a needle valve and a ball valve are arranged on the bypass gas supply pipeline; The low-flow gas supply pipe is automatically controlled to open and close, and a ball valve, a check valve, a flow controller, and a pressure gauge are arranged on the low-flow gas supply pipeline; The high-flow gas supply pipe is automatically controlled to open and close, and a ball valve, a regulating valve, a check valve, a flowmeter, and a pressure gauge are arranged on the high-flow gas supply pipeline.

2. The flow control valve group according to claim 1, wherein The diameter of the main road gas supply pipe is DN60 - DN200, the diameter of the bypass gas supply pipe is DN20 - DN40, the diameter of the low-flow gas supply pipe is DN20 - DN40, and the diameter of the high-flow gas supply pipe is DN40 - DN60.

3. The flow control valve group according to claim 1, wherein The maximum gas supply flow rate Q of the low-flow gas supply pipe 低max is 100 Nm 3 / h. The maximum gas supply flow rate Q of the high-flow gas supply pipe 高max is 1000 Nm 3 / h.

4. A gas supply method for a high regulation ratio flow control valve group for bottom blowing of a converter, which is realized by the control valve group according to any one of claims 1 - 3, and includes the following steps: Step 1: Determine the magnitude of the designed gas supply flow q of the i-th branch set in the gas supply model, the maximum gas supply value of the low-flow gas supply pipeline of the i-th branch, and the maximum gas supply value of the high-flow gas supply pipeline of the i-th branch; Step 2: According to the minimum and maximum gas supply values of the low-flow gas supply pipeline of the i-th branch and the minimum and maximum gas supply values of the high-flow gas supply pipeline of the i-th branch, determine the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline, and determine the regulation ratio based on the gas supply flow range of the low-flow gas supply pipeline and the gas supply flow range of the high-flow gas supply pipeline; Step 3: Compare the magnitude of the designed gas supply flow q of the i-th branch with the maximum gas supply value of the low-flow gas supply pipeline of the i-th branch and the maximum gas supply value of the high-flow gas supply pipeline of the i-th branch, determine the gas supply principle according to the comparison result, and select the gas supply pipeline for the i-th branch to supply gas according to the gas supply principle: Step 4: Adjust the flow rate of the i-th branch gas supply pipeline determined in Step 3 so that the difference between the actual gas supply flow rate of the i-th branch and the designed gas supply flow rate q is ≤ 0.5 Nm 3 / h; Step 5: According to Steps 1 to 4, adjust the flow rates of other gas supply branches so that the difference between the actual gas supply flow rate and the designed gas supply flow rate is ≤ 0.5 Nm 3 / h.

5. The gas supply method according to claim 4, wherein In step 2, the implementation principle of the regulation ratio includes: When the gas supply flow rate Q of the low-flow gas supply pipeline 低 = 1 - 10 Nm 3 / h, adjust the gas supply flow rate Q of the high-flow gas supply pipeline 高 = 10 - 100 Nm 3 / h, the total flow rate of the valve group can be achieved within the range of 1 - 110 Nm 3 / h, and the control and adjustment of the flow rate with a regulation ratio of 1:100 can be realized; When the supply air flow rate Q of the low-flow gas supply pipeline 低 = 2 - 20 Nm 3 / h, adjust the supply air flow rate Q of the high-flow gas supply pipeline 高 = 20 - 200 Nm 3 / h, the total flow rate of the valve group can be achieved within the range of 2 - 220 Nm 3 / h, and the control and adjustment of the flow rate with a regulation ratio of 1:100 can be realized.

6. The gas supply method according to claim 5, characterized in that In step 2, the implementation principle of the regulation ratio further includes: When the supply air flow rate Q of the low-flow supply air pipeline 低 = 3 - 30 Nm 3 / h, adjust the high-flow supply air pipeline The gas supply flow rate Q of the pipeline 高 = 30 - 300 Nm 3 / h, which can achieve the control and regulation of the total flow rate of the valve group within the range of 3 - 330 Nm 3 / h, with a regulation ratio of 1:100 for flow rate control and regulation; When the gas supply flow rate Q of the low-flow gas supply pipeline 低 = 4 - 40 Nm 3 / h, adjust the gas supply flow rate Q of the high-flow gas supply pipeline 高 = 40 - 400 Nm 3 / h, the total flow rate of the valve group can be achieved within the range of 4 - 440 Nm 3 / h, and the control and adjustment of the flow rate with a regulation ratio of 1:100 can be realized.

7. The air supply method according to claim 6, characterized in that In step 2, the implementation principle of the regulation ratio further includes: When the supply air flow rate Q of the low-flow supply air pipeline 低 = 5 - 50 Nm 3 / h, adjust the supply air flow rate Q of the high-flow supply air pipeline 高 = 50 - 500 Nm 3 / h, the total flow rate of the valve group can be achieved within the range of 5 - 550 Nm 3 / h, and the control and adjustment of the flow rate with a regulation ratio of 1:100 can be realized; When the gas supply flow rate Q of the low-flow gas supply pipeline 低 = 10 - 100 Nm 3 / h, adjust the gas supply flow rate Q of the high-flow gas supply pipeline 高 = 100 - 1000 Nm 3 / h, the total flow rate of the valve group can be achieved within the range of 10 - 1100 Nm 3 / h, and the control and adjustment of the flow rate with a regulation ratio of 1:100 can be realized.

8. The gas supply method according to claim 7, wherein In step 3, the gas supply principle includes: When q ≤ Q 低max , select the low-flow gas supply line as the gas supply line for the i-th branch; where q is the designed gas supply flow rate of the i-th branch, Nm 3 / h; Q 低max is the maximum gas supply value of the low-flow gas supply pipeline for the i-th branch, Nm 3 / h.

9. The gas supply method according to claim 8, wherein In step 3, the gas supply principle further includes: When Q 低max <q ≤ Q 高max , select the high-flow gas supply line as the gas supply line for the i-th branch; Among them, Q 高max The maximum gas supply value of the high-flow gas supply pipeline of the i-th branch, Nm 3 / h.

10. The gas supply method according to claim 9, wherein, In step 3, the gas supply principle further includes: When Q 高max ≤q≤Q 低max +Q 高max , fully open the high-flow gas supply pipeline, and adjust the flow rate of the low-flow gas supply pipeline according to |q - (Q 高max +Q 低max ). The high-flow gas supply pipeline and the low-flow gas supply pipeline jointly serve as the gas supply pipeline for the i-th branch.

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