High-adjustment specific flow rate control valve group for bottom blowing converter and gas supply method

Abstract

This application relates to a converter bottom blowing high-adjustment ratio flow control valve group, which belongs to the field of steel metallurgy technology. It is used to solve the problem that conventional converter bottom blowing gas supply valve groups have a low flow control ratio and it is difficult to achieve high-adjustment ratio flow control within a wide flow rate range. The converter bottom blowing high-adjustment ratio flow control valve group includes a main line and a branch line, where the main line is connected in series to multiple branch lines, which are connected in parallel. The main line includes a main line gas supply pipe, a ball valve, a check valve, an adjustment valve, a shutoff valve, and a pressure gauge. Each branch line 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 equipped with a needle valve and a ball valve, and the low-flow gas supply pipe is equipped with a ball valve, a check valve, a flow controller, and a pressure gauge. The high-flow gas supply pipe is equipped with a ball valve, an adjustment valve, a check valve, a flowmeter, and a pressure gauge. The present invention makes it possible to precisely control and adjust the flow rate of the valve group at an adjustment ratio of 1:100 within a wide flow rate gas supply range.

Description

[Technical Field]

[0001] The present application relates to the technical field of iron and steel metallurgy, and in particular to a group of high-adjustment specific flow rate control valves for bottom blowing in a converter and a gas supply method. [Background technology]

[0002] In the steel smelting process using a converter, gas injection into the high-temperature molten pool from the bottom of the converter can effectively improve the stirring of the molten metal, promote the slag-steel reaction, and further promote the uniformity of the composition and temperature of the molten metal, thereby improving the quality and efficiency of converter smelting.

[0003] Conventional converter bottom blowing gas supply valve groups use regulating valves or flow controllers to adjust and control the gas flow rate. Influenced by the adjustment accuracy, the adjustment ratio of the regulating valve is generally 10:1, that is, the maximum flow rate is 10 times the minimum flow rate. In addition, influenced by the adjustment range and equipment price, the flow rate adjustment range of the flow controller is generally 200 Nm 3 / h or less. Therefore, it is difficult to achieve flow rate regulation with a high regulation ratio over a wide flow rate range using conventional gas supply valve groups and gas supply methods. Summary of the Invention [Problem to be solved by the invention]

[0004] In consideration of the above analysis, the embodiments of the present application aim to provide a converter bottom blowing high adjustment ratio flow rate control valve group and a gas supply method in order to solve the problem that the flow rate adjustment ratio of the conventional converter bottom blowing gas supply valve group is low and it is difficult to achieve flow rate adjustment with a high adjustment ratio over a wide flow rate range.

[0005] The objectives of the present application are mainly achieved by the following technical solutions:

[0006] On the other hand, the present application provides a group of high-adjustment specific flow rate control valves for bottom blowing of a converter, including a main passage and a branch passage, the main path is connected in series to a plurality of branch paths, and the plurality of branch paths are connected in parallel; the main line includes a main line gas supply pipe, a ball valve, a check valve, a regulating valve, a shutoff valve, and a pressure gauge, and the shutoff valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are arranged in this order on the main line gas supply pipe; The number of the branch paths is N, and each branch path includes a bypass gas supply pipe, a low flow rate gas supply pipe, and a high flow rate gas supply pipe; the bypass gas supply pipe is manually opened and closed, and a needle valve and a ball valve are provided in the bypass gas supply pipe; The low flow rate gas supply pipe is automatically controlled to open and close, and is provided with a ball valve, a check valve, a flow rate controller, and a pressure gauge; The high flow rate gas supply pipe is automatically controlled to open and close, and is equipped with a ball valve, an adjustment valve, a check valve, a flow meter, and a pressure gauge.

[0007] Furthermore, the pipe diameter of the main gas supply pipe is DN60 to DN200, the pipe diameter of the bypass gas supply pipe is DN20 to DN40, the pipe diameter of the low flow rate gas supply pipe is DN20 to DN40, and the pipe diameter of the high flow rate gas supply pipe is DN40 to DN60.

[0008] Furthermore, the maximum gas supply flow rate Q of the low flow rate gas supply pipe 低max is 100Nm 3 / h, and the maximum gas supply flow rate Q of the high flow rate gas supply pipe 高max is 1000Nm 3 / h.

[0009] On the other hand, there is further provided a gas supply method for a converter bottom blowing high adjustment specific flow rate control valve group realized by the above control valve group, the method comprising: Step 1: determining the magnitude of the design gas supply flow rate q of the i-th branch path set by the gas supply model, the maximum gas supply value of the low flow rate gas supply pipe of the i-th branch path, and the maximum gas supply value of the high flow rate gas supply pipe of the i-th branch path; a step 2 of determining a range of gas supply flow rates for the low flow gas supply pipe and a range of gas supply flow rates for the high flow gas supply pipe based on the minimum and maximum gas supply values ​​of the low flow gas supply pipe of the i-th branch path and the minimum and maximum gas supply values ​​of the high flow gas supply pipe of the i-th branch path, and determining an adjustment ratio based on the range of gas supply flow rates for the low flow gas supply pipe and the range of gas supply flow rates for the high flow gas supply pipe; Step 3: comparing the magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value of the low-flow gas supply pipe of the i-th branch, comparing the magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value of the high-flow gas supply pipe of the i-th branch, determining a gas supply principle according to the comparison result, and selecting a gas supply pipe according to the gas supply principle to supply gas to the i-th branch; Based on the gas supply pipe of the ith branch determined in step 3, the difference between the actual gas supply flow rate of the ith branch and the design gas supply flow rate q of the ith branch is 0.5 Nm 3 Step 4: adjusting the flow rate of the gas supply pipe of the ith branch so that the flow rate is equal to or less than 1 / h; According to steps 1 to 4, the difference between the actual gas supply flow rate of the other gas supply branch and the design gas supply flow rate is 0.5 Nm 3 and step 5, adjusting the flow rates of the other gas supply branches so that the flow rate is equal to or less than 1 / h.

[0010] Furthermore, in step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low-flow gas supply pipe is Q 低 =1~10Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =10~100Nm 3 / h, 1~110Nm 3 / h with an adjustment ratio of 1:100. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =2~20Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =20~200Nm 3 / h, 2~220Nm3 This includes being able to control and adjust the total flow rate of the valve group with an adjustment ratio of 1:100 within the range of 1:1 / h.

[0011] Furthermore, in step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low-flow gas supply pipe is Q 低 =3~30Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =30~300Nm 3 / h, 3~330Nm 3 / h with an adjustment ratio of 1:100. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =4~40Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =40~400Nm 3 / h, 4~440Nm 3 / h with an adjustment ratio of 1:100.

[0012] Furthermore, in step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low-flow gas supply pipe is Q 低 =5~50Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =50~500Nm 3 / h, 5~550Nm 3 / h with an adjustment ratio of 1:100. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =10~100Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =100~1000Nm 3 / h, 10~1100Nm 3 / h with an adjustment ratio of 1:100.

[0013] Further, in step 3, the gas supply principle is: q≦Q 低max In the case of (i), a low flow rate gas supply pipe is selected as the gas supply pipe of the i-th branch path; q is the design gas supply flow rate Nm of the ith branch 3 / h, Q 低max is the maximum gas supply value Nm of the low flow gas supply pipe of the i-th branch 3 / h.

[0014] Further, in step 3, the gas supply principle is: Q 低max <q≦Q 高max further comprising selecting a high flow rate gas supply pipe as the gas supply pipe of the i-th branch path in the case of Q 高max is the maximum gas supply value Nm of the high flow rate gas supply pipe of the ith branch 3 / h.

[0015] Further, in step 3, the gas supply principle is: Q 高max ≦q≦Q 低max +Q 高max In this case, the high flow gas supply pipe is fully opened and the low flow gas supply pipe is opened. 高max +Q 低max )|, and setting both the high flow rate gas supply pipe and the low flow rate gas supply pipe as the gas supply pipes of the i-th branch path.

[0016] Compared with the conventional technology, the present application can achieve at least one of the following beneficial effects: 1. The flow control valve group of the present application includes a main line and a branch line, and each branch line includes a bypass gas supply pipe, a low flow gas supply pipe, and a high flow gas supply pipe. The low flow gas supply pipe and the high flow gas supply pipe work together to precisely control and adjust the flow rate of the valve group with an adjustment ratio of 1:100 within a wide flow rate gas supply range. 2. In the gas supply method of the present application, the design gas supply flow rate q of the i-th branch path is compared with the maximum gas supply value of the low-flow gas supply pipe of the i-th branch path, and the design gas supply flow rate q of the i-th branch path is compared with the maximum gas supply value of the high-flow gas supply pipe of the i-th branch path to determine the gas supply principle, and the gas supply pipe of the i-th branch path can be precisely selected in accordance with the gas supply principle, and the flow rate of the valve group can be precisely controlled and adjusted with an adjustment ratio of 1:100 within a wide flow rate gas supply range. 3. In the gas supply method of the present application, the flow rate of the valve group is precisely controlled and adjusted with an adjustment ratio of 1:100 within a wide flow rate supply range, and the difference between the actual gas supply flow rate of the valve group and the designed gas supply flow rate is 0.5 Nm 3 / h or less, and the adjustment accuracy is relatively high.

[0017] In the present application, the above technical solutions can be combined with each other to achieve more preferred combined solutions. Other features and advantages of the present application will be set forth in the specification that follows, and some advantages will be apparent from the specification or may be learned by practice of the present application. The objectives and other advantages of the present application will be realized and obtained through the details particularly pointed out in the specification and drawings. [Brief explanation of the drawings]

[0018] The accompanying drawings are used only to illustrate specific embodiments and are not intended to limit the present application. Like reference numerals refer to like components throughout the accompanying drawings. [Figure 1] FIG. 1 is a schematic diagram of a flow control valve group according to a first embodiment of the present invention. [Figure 2] FIG. 2 is a process schematic diagram of the gas supply method of the present application. [Explanation of symbols]

[0019] 1. Main line shut-off valve, 2. Main line adjustment valve, 3. Main line pressure gauge, 4. Main line check valve, 5. Main line ball valve, 6. Flow meter installed in the high flow rate gas supply pipe of the first branch line, 7. Flow controller installed in the low flow rate gas supply pipe of the first branch line, 8. Needle valve installed in the bypass gas supply pipe of the first branch line, 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 rate gas supply pipe of the first branch line, Q-2, low flow rate gas supply pipe of the first branch line, Q-3, bypass gas supply pipe of the first branch line. DETAILED DESCRIPTION OF THE INVENTION

[0020] Preferred embodiments of the present application will now be described in detail with reference to the accompanying drawings, which constitute a part of this application and, together with the embodiments of the present application, are used to explain the principles of the present application and are not intended to limit the scope of the present application.

[0021] The present application provides a group of high-adjustment specific flow rate control valves for bottom blowing of a converter, including a main passage and a branch passage, The main line includes a main line gas supply pipe, a ball valve, a check valve, an adjustment valve, a shutoff valve, and a pressure gauge, and the shutoff valve, the adjustment valve, the pressure gauge, the check valve, and the ball valve are arranged in order on the main line gas supply pipe, supplying gas to all branch lines in a wide flow rate range; The number of the branch paths is N, and each branch path includes a bypass gas supply pipe, a low flow rate gas supply pipe, and a high flow rate gas supply pipe; The bypass gas supply pipe is manually opened and closed, and is provided with a needle valve and a ball valve, so as to meet the gas supply needs when the valve group is in an abnormal operating state; The low flow rate gas supply pipe is automatically controlled to open and close, and is provided with a ball valve, a check valve, a flow rate controller, and a pressure gauge; The high flow rate gas supply pipe is automatically controlled to open and close, and is provided with a ball valve, an adjustment valve, a check valve, a flow meter, and a pressure gauge; the main passage is connected in series to a plurality of branch passages and controls the adjustment of the total flow rate of the plurality of branch passages; The plurality of branch paths are connected in parallel, and each branch path supplies gas independently.

[0022] The diameter of the main gas supply pipe is DN60 to DN200, the diameter of the bypass gas supply pipe is DN20 to DN40, the diameter of the low flow rate gas supply pipe is DN20 to DN40, and the diameter of the high flow rate gas supply pipe is DN40 to DN60.

[0023] The maximum gas supply flow rate of the low-flow gas supply pipe is 100 Nm 3 / h, and the minimum gas supply flow rate of the high-flow gas supply pipe is 20 Nm 3 / h, and the maximum gas supply flow rate of the high-flow gas supply pipe is 1000 Nm 3 / h.

[0024] The present application further provides a gas supply method for a converter bottom blowing high adjustment specific flow rate control valve group realized by the above control valve group, the method comprising: Step 1: determining the magnitude of the design gas supply flow rate q of the i-th branch path set by the gas supply model, the maximum gas supply value of the low flow rate gas supply pipe of the i-th branch path, and the maximum gas supply value of the high flow rate gas supply pipe of the i-th branch path; a step 2 of determining a range of gas supply flow rates for the low flow gas supply pipe and a range of gas supply flow rates for the high flow gas supply pipe based on the minimum and maximum gas supply values ​​of the low flow gas supply pipe of the i-th branch path and the minimum and maximum gas supply values ​​of the high flow gas supply pipe of the i-th branch path, and determining an adjustment ratio based on the range of gas supply flow rates for the low flow gas supply pipe and the range of gas supply flow rates for the high flow gas supply pipe; Step 3: comparing the magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value of the low-flow gas supply pipe of the i-th branch, comparing the magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value of the high-flow gas supply pipe of the i-th branch, determining a gas supply principle, and selecting a gas supply pipe to supply gas to the i-th branch according to the gas supply principle; Based on the gas supply pipe of the ith branch determined in step 3, the difference between the actual gas supply flow rate of the ith branch and the design gas supply flow rate q of the ith branch is 0.5 Nm 3 Step 4: adjusting the flow rate of the gas supply pipe of the ith branch so that the flow rate is equal to or less than 1 / h; According to steps 1 to 4, the difference between the actual gas supply flow rate of the other gas supply branch and the design gas supply flow rate is 0.5 Nm 3 and step 5, adjusting the flow rates of the other gas supply branches so that the flow rate is equal to or less than 1 / h.

[0025] Specifically, in step 1, the value of i ranges from 1 to N, where N is an integer, Specifically, in step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low-flow gas supply pipe is Q 低 =1~10Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =10~100Nm 3 / h, 1~110Nm 3 / h with a 1:100 adjustment ratio, allowing precise control and adjustment of the total flow rate of the valve group. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =2~20Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =20~200Nm 3 / h, 2~220Nm 3 / h with a 1:100 adjustment ratio, allowing precise control and adjustment of the total flow rate of the valve group. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =3~30Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =30~300Nm 3 / h, 3~330Nm 3 / h with a 1:100 adjustment ratio, allowing precise control and adjustment of the total flow rate of the valve group. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =4~40Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =40~400Nm 3 / h, 4~440Nm 3 / h with a 1:100 adjustment ratio, allowing precise control and adjustment of the total flow rate of the valve group. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =5~50Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =50~500Nm 3 / h, 5~550Nm 3 / h with a 1:100 adjustment ratio, allowing precise control and adjustment of the total flow rate of the valve group. The gas supply flow rate of the low-flow gas supply pipe is Q 低 =10~100Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =100~1000Nm 3 / h, 10~1100Nm 3 This includes being able to precisely control and adjust the total flow rate of the valve group with an adjustment ratio of 1:100 within the range of 1 / h.

[0026] Specifically, in step 3, the design gas supply flow rate q of the i-th branch and the maximum gas supply value Q of the low-flow gas supply pipe of the i-th branch are calculated. 低max The magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value Q of the high flow rate gas supply pipe of the i-th branch is compared. 高max and the magnitude relationship is compared to determine the gas supply principle, and a gas supply pipe is selected according to the gas supply principle to supply gas to the i-th branch path, and the gas supply principle is q≦Q 低max In the case of (i), a low flow rate gas supply pipe is selected as the gas supply pipe of the i-th branch path; Q 低max <q≦Q 高max further comprising selecting a high flow rate gas supply pipe as the gas supply pipe of the i-th branch path in the case of Q 高max ≦q≦Q 低max +Q 高maxIn this case, the high flow gas supply pipe is fully opened and the low flow gas supply pipe is opened. 高max +Q 低max )|, and both the high flow rate gas supply pipe and the low flow rate gas supply pipe are used as gas supply pipes for the ith branch path.

[0027] The present application makes it possible to precisely adjust and control the flow rate at a flow rate adjustment ratio of 1:100 within a wide flow rate range during the converter smelting process by using the above-mentioned flow rate control valve group and gas supply method.

[0028] Example 1 This embodiment provides a high-adjustment specific flow rate control valve group for converter bottom blowing, and as shown in FIG. 1, the valve group includes a main passage and a branch passage, The main line is shown by A in FIG. 1 and includes a main line gas supply pipe, a ball valve, a check valve, an adjustment valve, a shutoff valve, and a pressure gauge. The shutoff valve, the adjustment valve, the pressure gauge, the check valve, and the ball valve are arranged in order on the main line gas supply pipe along the gas supply direction, so that gas can be supplied to all branch lines in a wide flow rate range. The number of the branch paths is N, and is represented by Bi (i=1, 2, 3...N) in FIG. 1, and each branch path includes a bypass gas supply pipe (Q-3), a low flow rate gas supply pipe (Q-2), and a high flow rate gas supply pipe (Q-1); The bypass gas supply pipe is manually opened and closed, and is provided with a needle valve and a ball valve, so as to meet the gas supply needs when the valve group is in an abnormal operating state; The low flow rate gas supply pipe is automatically controlled to open and close, and is provided with a ball valve, a check valve, a flow rate controller, and a pressure gauge; The high flow rate gas supply pipe is automatically controlled to open and close, and is provided with a ball valve, an adjustment valve, a check valve, a flow meter, and a pressure gauge; the main passage is connected in series to a plurality of branch passages and controls the adjustment of the total flow rate of the plurality of branch passages; The multiple branch paths were connected in parallel, and each branch path supplied gas independently.

[0029] The diameter of the main gas supply pipe was DN60 to DN200, the diameter of the bypass gas supply pipe was DN20 to DN40, the diameter of the low flow gas supply pipe was DN20 to DN40, and the diameter of the high flow gas supply pipe was DN40 to DN60.

[0030] Low flow gas supply pipe flow range is 1~10Nm 3 / h, and the flow rate range of the high flow gas supply pipe is 10~100Nm 3 / h.

[0031] Example 2 In this example, the gas supply flow rate q of the ith branch path of the gas supply model is 1 Nm 3 / h, 5Nm 3 / h, 20Nm 3 / h, 50Nm 3 / h, 100Nm 3 / h, and 105Nm 3 / h.

[0032] Supplying gas by the flow control valve group of the first embodiment is In step 1, the magnitude of the design gas supply flow rate q of the i-th branch path set by the gas supply model, the range of gas supply of the low-flow gas supply pipe of the i-th branch path, and the range of gas supply of the high-flow gas supply pipe of the i-th branch path are determined. In the first flow section, q=1Nm 3 / h, In the second flow section, q=5Nm 3 / h, In the third flow section, q=20Nm 3 / h, In the fourth flow section, q=50Nm 3 / h, In the fifth flow section, q = 100 Nm 3 / h, In the sixth flow section, q=105Nm 3 / h, The gas supply range of the low flow gas supply pipe of the ith branch is 1 to 10 Nm 3 / h, The gas supply range of the high flow rate gas supply pipe of the ith branch is 10 to 100 Nm 3 Step 1 is / h, and determining a range of gas supply flow rates for the low flow gas supply pipe and a range of gas supply flow rates for the high flow gas supply pipe based on the minimum gas supply value and the maximum gas supply value of the low flow gas supply pipe of the i-th branch path and the minimum gas supply value and the maximum gas supply value of the high flow gas supply pipe of the i-th branch path; and determining an adjustment ratio based on the range of gas supply flow rates for the low flow gas supply pipe and the range of gas supply flow rates for the high flow gas supply pipe; The gas supply flow rate of the low-flow gas supply pipe is Q 低 =1~10Nm 3 / h, the gas supply flow rate of the high-flow gas supply pipe is Q 高 =10~100Nm 3 / h, 1~110Nm 3 / h with a 1:100 adjustment ratio, i.e., Q 低max =10Nm 3 / h, Q 高max =100Nm 3 Step 2 to change it to / h, The magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value of the low-flow gas supply pipe of the i-th branch is compared, the magnitude relationship between the design gas supply flow rate q of the i-th branch and the maximum gas supply value of the high-flow gas supply pipe of the i-th branch is compared, a gas supply principle is determined according to the comparison result, and a gas supply pipe is selected in accordance with the gas supply principle to supply gas to the i-th branch, In the first flow section, q=1Nm 3 / h, q≦Q 低max and a low flow rate gas supply pipe is selected as the gas supply pipe for the i-th branch path, In the second flow section, q=5Nm 3 / h, q 低max and a low flow rate gas supply pipe is selected as the gas supply pipe for the i-th branch path, In the third flow section, q=20Nm 3 / h, Q​低max <q<Q 高max and a high flow rate gas supply pipe is selected as the gas supply pipe for the i-th branch path, In the fourth flow section, q=50Nm 3 / h, Q 低max <q<Q 高max and a high flow rate gas supply pipe is selected as the gas supply pipe for the i-th branch path, In the fifth flow section, q = 100 Nm 3 / h, q≦Q 高max and a high flow rate gas supply pipe is selected as the gas supply pipe for the i-th branch path, In the sixth flow section, q=105Nm 3 / h, Q 高max ≦q≦Q 低max +Q 高max The high-flow gas supply pipe is fully opened, and the low-flow gas supply pipe is closed. 高max +Q 低max Step 3: adjusting the flow rate according to the i-th branch path, and setting both the high-flow rate gas supply pipe and the low-flow rate gas supply pipe as the gas supply pipe of the i-th branch path; Based on the gas supply pipe of the ith branch determined in step 3, the difference between the actual gas supply flow rate of the ith branch and the design gas supply flow rate q of the ith branch is 0.5 Nm 3 / h or less, and adjust the flow rate of the gas supply pipe of the ith branch path. In the first flow section, a low flow gas supply pipe is selected as the gas supply pipe of the i-th branch, and the flow rate of the gas supply pipe of the i-th branch is adjusted, and the actual gas supply flow rate of the i-th branch is 1.05 Nm 3 / h, In the second flow section, a low flow gas supply pipe is selected as the gas supply pipe of the i-th branch, and the flow rate of the gas supply pipe of the i-th branch is adjusted, so that the actual gas supply flow rate of the i-th branch is 1.05 Nm 3 / h, In the third flow section, a high flow gas supply pipe is selected as the gas supply pipe of the ith branch, and the flow rate of the gas supply pipe of the ith branch is adjusted, and the actual gas supply flow rate of the ith branch is 5.1 Nm 3 / h, In the fourth flow section, a high flow gas supply pipe is selected as the gas supply pipe of the ith branch, and the flow rate of the gas supply pipe of the ith branch is adjusted, and the actual gas supply flow rate of the ith branch is 49.5 Nm 3 / h, In the fifth flow section, a high flow gas supply pipe is selected as the gas supply pipe of the ith branch, and the flow rate of the gas supply pipe of the ith branch is adjusted, and the actual gas supply flow rate of the ith branch is 99.5 Nm 3 / h, In the sixth flow section, the high-flow gas supply pipe is fully open and the low-flow gas supply pipe is open at |q-(Q 高max +Q 低max )|(i.e. 5Nm 3 / h), the actual gas supply flow rate of the high-flow gas supply pipe is 99.5 Nm 3 / h, and the actual gas supply flow rate of the low-flow gas supply pipe is 5.6 Nm 3 / h, and the total actual gas supply flow rate of the ith branch is 105.1 Nm 3 Step 4, which is / h, According to steps 1 to 4, the difference between the actual gas supply flow rate of the other gas supply branch and the design gas supply flow rate is 0.5 Nm 3 and step 5, adjusting the flow rates of the other gas supply branches so that the flow rate is equal to or less than 1 / h.

[0033] In this embodiment, 1 to 110 Nm 3 The total flow rate of the valve group can be precisely controlled and adjusted within the range of 1:100 / h.

[0034] The above are merely preferred specific embodiments of the present application, and the scope of protection of the present application is not limited thereto. Any modifications or replacements that can be easily conceived by those skilled in the art within the technical scope disclosed in the present application shall be included in the scope of protection of the present application.

Claims

1. A group of high-adjustment specific flow rate control valves for bottom blowing of a converter, It includes a main road and a branch road, the main path is connected in series to the plurality of branch paths, and the plurality of branch paths are connected in parallel; the main line includes a main line gas supply pipe, a ball valve, a check valve, a regulating valve, a shutoff valve, and a pressure gauge, and the shutoff valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are arranged in this order on the main line gas supply pipe; the number of the branch paths is N, and each of the branch paths includes a bypass gas supply pipe, a low flow rate gas supply pipe, and a high flow rate gas supply pipe; the bypass gas supply pipe is manually opened and closed, and a needle valve and a ball valve are provided in the bypass gas supply pipe; The low flow rate gas supply pipe is automatically controlled to open and close, and is provided with a ball valve, a check valve, a flow rate controller, and a pressure gauge; a high adjustment ratio flow control valve group for converter bottom blowing, characterized in that the high flow rate gas supply pipe is automatically controlled to open and close, and the high flow rate gas supply pipe is provided with a ball valve, an adjustment valve, a check valve, a flow meter, and a pressure gauge.

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

3. The maximum gas supply flow rate Q of the low flow rate gas supply pipe 低ｍａｘ is 100Nm 3 / h, and the maximum gas supply flow rate Q of the high flow rate gas supply pipe 高ｍａｘ is 1000Nm 3 2. The flow control valve group according to claim 1, wherein the flow rate is 1 / h.

4. A gas supply method for a converter bottom blowing high adjustment specific flow rate control valve group realized by the control valve group according to any one of claims 1 to 3, comprising: Step 1: determining the magnitude of the design gas supply flow rate q of the i-th branch path set by the gas supply model, the maximum gas supply value of the low flow rate gas supply pipe of the i-th branch path, and the maximum gas supply value of the high flow rate gas supply pipe of the i-th branch path; a step 2 of determining a range of gas supply flow rates for the low flow gas supply pipe and a range of gas supply flow rates for the high flow gas supply pipe based on the minimum gas supply value and the maximum gas supply value of the low flow gas supply pipe of the i-th branch path and the minimum gas supply value and the maximum gas supply value of the high flow gas supply pipe of the i-th branch path, and determining an adjustment ratio based on the range of gas supply flow rates for the low flow gas supply pipe and the range of gas supply flow rates for the high flow gas supply pipe; Step 3: comparing the magnitude relationship between the design gas supply flow rate q of the i-th branch path and the maximum gas supply value of the low-flow gas supply pipe of the i-th branch path, comparing the magnitude relationship between the design gas supply flow rate q of the i-th branch path and the maximum gas supply value of the high-flow gas supply pipe of the i-th branch path, determining a gas supply principle according to the comparison result, and selecting a gas supply pipe according to the gas supply principle to supply gas to the i-th branch path; Based on the gas supply pipe of the i-th branch path determined in step 3, the difference between the actual gas supply flow rate of the i-th branch path and the design gas supply flow rate q of the i-th branch path is 0.5 Nm 3 Step 4: adjusting the flow rate of the gas supply pipe of the ith branch path so that the flow rate is equal to or less than 1 / h; According to steps 1 to 4, the difference between the actual gas supply flow rate of the other gas supply branch and the design gas supply flow rate is 0.5 Nm 3 and step 5 of adjusting the flow rates of the other gas supply branch lines so that the flow rate of the other gas supply branch lines is equal to or less than 1 / h.

5. In step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low flow gas supply pipe is Q 低 = 1 to 10 Nm 3 / h, the gas supply flow rate of the high flow rate gas supply pipe is set to Q 高 = 10 to 100 Nm 3 / h, 1 to 110 Nm 3 / h with an adjustment ratio of 1:100, and The gas supply flow rate of the low flow rate gas supply pipe is Q 低 = 2 to 20 Nm 3 / h, the gas supply flow rate of the high flow rate gas supply pipe is set to Q 高 = 20 to 200 Nm 3 / h, 2 to 220 Nm 3 5. The gas supply method according to claim 4, further comprising controlling and adjusting the total flow rate of the valve group at an adjustment ratio of 1:100 within a range of 1:100 / h.

6. In step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low flow rate gas supply pipe is Q 低 = 3 to 30 Nm 3 / h, the gas supply flow rate of the high flow rate gas supply pipe is set to Q 高 = 30 to 300 Nm 3 / h, it is 3 to 330 Nm 3 / h with an adjustment ratio of 1:100, and The gas supply flow rate of the low flow rate gas supply pipe is Q 低 = 4 to 40 Nm 3 / h, the gas supply flow rate of the high flow rate gas supply pipe is set to Q 高 = 40 to 400 Nm 3 / h, 4 to 440 Nm 3 6. The gas supply method according to claim 5, further comprising controlling and adjusting the total flow rate of the valve group at an adjustment ratio of 1:100 within a range of 1:10 / h.

7. In step 2, the realization principle of the adjustment ratio is: The gas supply flow rate of the low flow rate gas supply pipe is Q 低 = 5 to 50 Nm 3 / h, the gas supply flow rate of the high flow rate gas supply pipe is set to Q 高 = 50 to 500 Nm 3 / h, 5 to 550 Nm 3 / h with an adjustment ratio of 1:100, and The gas supply flow rate of the low flow rate gas supply pipe is Q 低 = 10 to 100 Nm 3 / h, the gas supply flow rate of the high flow rate gas supply pipe is set to Q 高 =100~1000Nm 3 / h, it is 10 to 1100 Nm 3 7. The gas supply method of claim 6, further comprising controlling and adjusting the total flow rate of the valve group at an adjustment ratio of 1:100 within a range of 1:100 / h.

8. In step 3, the gas supply principle is: q≦Q 低ｍａｘ selecting a low flow rate gas supply pipe as the gas supply pipe of the i-th branch path in the case Here, q is the design gas supply flow rate Nm of the i-th branch path. 3 / h, Q 低ｍａｘ is the maximum gas supply value Nm of the low flow rate gas supply pipe of the i-th branch path 3 8. The gas supply method according to claim 7, wherein the gas supply rate is 1 / h.

9. In step 3, the gas supply principle is: Q 低ｍａｘ <q≦Q 高ｍａｘ further comprising selecting a high flow rate gas supply pipe as the gas supply pipe of the i-th branch path in the case of Here, Q 高ｍａｘ is the maximum gas supply value Nm of the high flow rate gas supply pipe of the i-th branch path 3 9. The gas supply method according to claim 8, wherein the gas supply rate is 1 / h.

10. In step 3, the gas supply principle is: Q 高ｍａｘ ≦q≦Q 低ｍａｘ +Q 高ｍａｘ In this case, the high flow rate gas supply pipe is fully opened, and the low flow rate gas supply pipe is opened. 高ｍａｘ +Q 低ｍａｘ 10. The gas supply method according to claim 9, further comprising adjusting the flow rates according to |i|, and using both the high flow rate gas supply pipe and the low flow rate gas supply pipe as the gas supply pipe of the i-th branch path.

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