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

Abstract

The present disclosure relates to a high-regulation-ratio flow control valve group for converter bottom-blowing, belonging to the technical field of steel metallurgy. The present disclosure is intended to solve the problem that the existing gas supply valve groups of converter bottom-blowing have a low flow regulation ratio and it is difficult to achieve high-regulation-ratio flow regulation within a wide flow range. The flow valve group for converter bottom-blowing includes a main pipeline and branch pipelines; the main pipeline is connected in series with multiple branch pipelines, and the multiple branch pipelines are connected in parallel; the main pipeline includes a main gas supply pipe, a ball valve, a check valve, a regulating valve, a shut-off valve, and a pressure gauge. The shut-off valve, regulating valve, pressure gauge, check valve, and ball valve are sequentially arranged on the main gas supply pipe; each branch pipeline includes a bypass gas supply pipe, a low-flow gas supply pipe, and a high-flow gas supply pipe; a needle valve and a ball valve are arranged on the bypass gas supply pipe; a ball valve, a check valve, a flow controller, and a pressure gauge are arranged on the low-flow gas supply pipe; a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are arranged on the high-flow gas supply pipe. The present disclosure enables precise control and regulation of the valve group's total flow within a wide flow range with a regulation ratio of 1:100.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the technical field of iron and steel metallurgy, and in particular to a high-regulation-ratio flow control valve group for converter bottom-blowing and gas supply method.BACKGROUND

[0002] In the steel converter refining process, blowing gas into the high-temperature molten pool from the bottom of the converter can effectively enhance the stirring of the molten metal, promote the slag-metal reaction, and further improve the homogenization of the composition and temperature of molten metal. This process ultimately enhances the quality and efficiency of converter refining.

[0003] Traditional gas supply valve groups of converter bottom-blowing typically adopt regulating valves or flow controllers to regulate and control the gas flow. However, affected by the regulation precision, the regulation ratio of the control valves generally is 10:1, meaning the maximum flow rate is ten times the minimum flow rate. Furthermore, the flow regulation range of flow controllers is usually below 200 Nm 3< / h, affected by the regulation range and equipment cost. As a result, it is difficult for existing gas supply valve groups and methods to achieve high-regulation-ratio flow regulation within a wide flow range.SUMMARY

[0004] In view of the above-mentioned situation, the present disclosure is intended to provide a high-regulation-ratio flow control valve group for converter bottom-blowing and gas supply method. The present disclosure is intended to solve the problem that the existing gas supply valve groups of converter bottom-blowing have a low flow regulation ratio and it is difficult to achieve high-regulation-ratio flow regulation within a wide flow range.

[0005] The objective of the present disclosure is mainly allowed by the following technical solutions:

[0006] In a first aspect, the present disclosure provides a high-regulation-ratio flow control valve group for converter bottom-blowing, which includes a main pipeline and branch pipelines.

[0007] The main pipeline is connected in series with multiple branch pipelines, and the multiple branch pipelines are connected in parallel.

[0008] The main pipeline includes a main gas 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 gas supply pipe.

[0009] The number of branch pipelines is N, and each branch pipeline includes a bypass gas supply pipe, a low-flow gas supply pipe, and a high-flow gas supply pipe.

[0010] The bypass gas supply pipe is manually controlled for opening and closing, and a needle valve and a ball valve are arranged on the bypass gas supply pipe.

[0011] The low-flow gas supply pipe is automatically controlled for opening and closing, and a ball valve, a check valve, a flow controller, and a pressure gauge are arranged on the low-flow gas supply pipe.

[0012] The high-flow gas supply pipe is also automatically controlled for opening and closing, and a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are arranged on the high-flow gas supply pipe.

[0013] Further, the diameter of the main 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.

[0014] Further, the maximum gas flow rate Q low max of the low-flow gas supply pipe is 100 Nm 3< / h, and the maximum gas flow rate Q high max of the high-flow gas supply pipe is 1000 Nm 3< / h.

[0015] In a second aspect, the present disclosure also provides a gas supply method of a high-regulation-ratio flow control valve group for converter bottom-blowing, implemented by the above control valve group, including the following steps: step 1: determine the design gas flow rate q of the i-th branch, the maximum gas supply value of the low-flow gas supply pipe and the high-flow gas supply pipe in the i-th branch; step 2: based on the minimum and maximum gas supply values of the low-flow gas supply pipe and the minimum and maximum gas supply values of the high-flow gas supply pipe in the i-th branch, determine the gas supply flow range of both the low-flow and the high-flow gas supply pipe, then, determine the regulation ratio according to the gas supply flow range of the low-flow and the high-flow gas supply pipes; step 3: compare the design gas flow rate q of the i-th branch with the maximum gas supply value of the low-flow gas supply pipe and the maximum gas supply value of the high-flow gas supply pipe of the i-th branch, based on the comparison result, determine the gas supply principles and select the i-th branch as the gas supply pipe for gas supply according to the gas supply principles; step 4: according to the i-th branch determined in step 3, adjust the flow rate of the i-th branch, ensuring that the difference between the actual gas flow rate and the design gas flow rate q is ≤0.5 Nm 3< / h; step 5: according to steps 1 to 4, adjust the flow rate of the remaining gas supply branch pipes so that the difference between the actual gas flow rate and the design gas flow rate is ≤0.5 Nm 3< / h;

[0016] Further, in step 2, the principles for achieving the regulation ratio include: When the gas flow rate of the low-flow gas supply pipe Q low is 1-10 Nm 3< / h, regulate the gas flow rate of the high-flow gas supply pipe Q high =10-100 Nm 3< / h, the total flow rate of the valve group can be controlled and regulated within the range of 1-110 Nm 3< / h, with a regulation ratio of 1:100; when the gas flow rate of the low-flow gas supply pipe Q low is 2-20 Nm 3< / h, regulate the gas flow rate of the high-flow gas supply pipe Q high =20-200 Nm 3< / h, the total flow rate of the valve group can be controlled and regulated within the range of 2-220 Nm 3< / h, with a regulation ratio of 1:100.

[0017] Further, in Step 2, the principles for achieving the regulation ratio further include: When the gas flow rate in the low-flow gas supply pipe Q low is 3-30 Nm 3< / h, regulate the gas flow rate of the high-flow gas supply pipe Q high =30-300 Nm 3< / h, the total flow rate of the valve group can be controlled and regulated within the range of 3-330 Nm 3< / h, with a regulation ratio of 1:100; when the gas flow rate of the low-flow gas supply pipe Q low is 4-40 Nm 3< / h, regulate the gas flow rate of the high-flow gas supply pipe Q high =40-400 Nm 3< / h, the total flow rate of the valve group can be controlled and regulated within the range of 4-440 Nm 3< / h, with a regulation ratio of 1:100.

[0018] Further, in Step 2, the principles for achieving the regulation ratio further include: When the gas flow rate of the low-flow gas supply pipe Q low is 5-50 Nm 3< / h, regulate the gas flow rate of the high-flow gas supply pipe Q high =50-500 Nm 3< / h, the total flow rate of the valve group can be controlled and regulated within the range of 5-550 Nm 3< / h, with a regulation ratio of 1:100; when the gas flow rate of the low-flow gas supply pipe Q low is 10-100 Nm 3< / h, regulate the gas flow rate of the high-flow gas supply pipe Q high =100-1000 Nm 3< / h, the total flow rate of the valve group can be controlled and regulated within the range of 10-1100 Nm 3< / h, with a regulation ratio of 1:100.

[0019] Further, in Step 3, the gas supply principles include: When q≤Q low max , select the low-flow gas supply pipe as the gas supply pipe of the i-th branch; where q is the designed gas flow rate of the i-th branch, measured in Nm 3< / h; and Q low max is the maximum gas flow rate of the low-flow gas supply pipe of the i-th branch, also measured in Nm 3< / h.

[0020] Further, in Step 3, the gas supply principles further include: When Q low max <q≤Q high max , select the high-flow gas supply pipe as the supply pipe of the i-th branch; where Q high max is the maximum gas flow rate of the high-flow gas supply pipe of the i-th branch, measured in Nm 3< / h.

[0021] Further, in Step 3, the gas supply principles further include: When Q high max ≤q≤Q low max +Q high max , select the high-flow gas supply pipe to be fully opened, and regulate the flow of the low-flow gas supply pipe based on |q-(Q high max +Q low max )|, both the high-flow gas supply pipe and the low-flow gas supply pipe together serve as the gas supply pipes of the i-th branch.

[0022] Compared with the prior art, the present disclosure can achieve at least one of the following beneficial effects: 1. The flow control valve group of the present disclosure includes a main pipeline and multiple branch pipelines, and each branch pipeline includes a bypass gas supply pipe, a low-flow gas supply pipe, and a high-flow gas supply pipe. By means of the coordinated operation of the low-flow and high-flow gas supply pipes, the valve group can achieve precise flow control and regulation with a regulation ratio of 1:100 within a wide range of gas flow. 2. The gas supply method of the present disclosure determines the gas supply principles by comparing the design gas flow rate q of the i-th branch with the maximum gas supply values of the low-flow, and the design gas flow rate q of the i-th branch with high-flow gas supply pipes in the i-th branch, based on this principles, the gas supply pipe of the i-th branch can be precisely selected, enabling accurate control and regulation with a regulation ratio of 1:100 within the wide flow range of the valve group. 3. The gas supply method of the present disclosure not only achieves precise control and regulation with a regulation ratio of 1:100 within a wide flow range, but also maintains a difference of ≤0.5 Nm 3< / h between the actual gas flow rate and the design gas flow rate of the valve group, ensuring relatively high regulation accuracy.

[0023] In the present disclosure, the aforementioned technical solutions can also be combined with each other to achieve more optimized combinations. Other features and advantages of the present disclosure will be detailed in the following description, with some advantages becoming apparent from the description or by practicing the disclosure. The objectives and other advantages of the present disclosure can be realized and obtained as specified in the description and accompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are provided merely to illustrate the specific embodiments, rather than to limit the present disclosure. The same reference numerals represent the same components throughout the accompanying drawings. FIG. 1 is a schematic diagram of the flow control valve group in Example 1 of the present disclosure; FIG. 2 is a schematic diagram illustrating the process of the gas supply method of the present disclosure; Reference numerals:

[0025] 1: main pipeline shut-off valve, 2: main pipeline regulating valve, 3: main pipeline pressure gauge, 4: main pipeline check valve, 5: main pipeline ball valve, 6: flow meter on the high-flow gas supply pipe of the first branch, 7: flow controller on the low-flow gas supply pipe of the first branch, 8: needle valve on the bypass gas supply pipe of the first branch, A: main pipeline, B: branch pipeline, B-1: first branch, B-2: second branch, B-3: third branch, Q-1: high-flow gas supply pipe of the first branch, Q-2: low-flow gas supply pipe of the first branch, and Q-3: bypass gas supply pipe of the first branch.DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] Preferred embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings constitute a part of the present disclosure, and are provided together with the embodiments of the present disclosure to explain the principles of the present disclosure.

[0027] The present disclosure provides a high-regulation-ratio flow control valve group for converter bottom blowing, which includes a main pipeline and branch pipelines.

[0028] The main pipeline includes a main gas 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 gas supply pipe, to supply gas in a wide flow range to all branch pipelines.

[0029] The number of branch pipelines is N, and each branch pipeline includes a bypass gas supply pipe, a low-flow gas supply pipe, and a high-flow gas supply pipe.

[0030] The bypass gas supply pipe is manually controlled for opening and closing, and a needle valve and a ball valve are arranged on the bypass gas pipeline, meeting the gas supply needs during an abnormal operating conditions of the valve group.

[0031] The low-flow gas supply pipe is automatically controlled for opening and closing, and a ball valve, a check valve, a flow controller, and a pressure gauge are arranged on the low-flow gas supply pipe.

[0032] The high-flow gas supply pipe is also automatically controlled for opening and closing, and a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are arranged on the high-flow gas supply pipe.

[0033] The main pipeline is connected in series with multiple branch pipelines to control the total flow rate of all branch pipelines.

[0034] The branch pipelines are connected in parallel, and each branch pipeline supplies gas independently.

[0035] The diameter of the main 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.

[0036] The maximum gas supply flow rate of the low-flow gas supply pipe is 100 Nm 3< / h, the minimum gas supply flow rate of the high-flow gas supply pipe is 20 Nm 3< / h, the maximum gas supply flow rate of the high-flow gas supply pipe is 1000 Nm 3< / h.

[0037] The present disclosure also provides a gas supply method of a high-regulation-ratio flow control valve group for converter bottom-blowing, implemented by the above-described valve group, including the following steps: Step 1: determine the design gas flow rate q of the i-th branch as set in the gas supply model, the maximum gas supply value of the low-flow gas supply pipe of the i-th branch, and the maximum gas supply value of the high-flow gas supply pipe of the i-th branch. Step 2: based on the minimum and maximum gas supply values of the low-flow gas supply pipe and the minimum and maximum gas supply values of the high-flow gas supply pipe of the i-th branch, determine the gas supply flow range of both the low-flow and high-flow gas supply pipe, according to the gas supply flow range of both the low-flow and high-flow gas supply pipe, determine the regulation ratio. Step 3: compare the design gas flow rate q of the i-th branch with the maximum gas supply value of the low-flow gas supply pipe of the i-th branch and compare the design gas flow rate q with the maximum gas supply value of the high-flow gas supply pipe of the i-th branch, based on the comparison result, determine the gas supply principles, and select the i-th branch as the gas supply pipe. Step 4: according to the i-th branch gas supply pipe determined in Step 3, adjust the flow rate of the i-th branch, ensuring that the difference between the actual gas flow rate and the design gas flow rate q is ≤0.5 Nm 3< / h. Step 5: according to Steps 1 to 4, adjust the flow rate of the other gas supply branch pipes so that the difference between the actual gas flow rate and the design gas flow rate is ≤0.5 Nm 3< / h.

[0038] Specifically, in Step 1, the value of i ranges from 1 to N, where N is an integer.

[0039] Specifically, in Step 2, the principles for achieving the regulation ratio include: When the gas flow rate of the low-flow gas supply pipe Q low is 1-10 Nm 3< / h, the gas flow rate of the high-flow gas supply pipe Q high is 10-100 Nm 3< / h, the valve group can achieve precise control and regulation of total flow rate within a range of 1-110 Nm 3< / h, with a regulation ratio of 1:100.

[0040] When the Q low is 2-20 Nm 3< / h, the Q high is 20-200 Nm 3< / h, the valve group can achieve precise control and regulation of total flow within a range of 2-220 Nm 3< / h, with a regulation ratio of 1:100.

[0041] When the Q low is 3-30 Nm 3< / h, the Q high is 30-300 Nm 3< / h, the valve group can achieve precise control and regulation of total flow within a range of 3-330 Nm 3< / h, with a regulation ratio of 1:100.

[0042] When the Q low is 4-40 Nm 3< / h, the Q high is 40-400 Nm 3< / h, the valve group can achieve precise control and regulation of total flow within a range of 4-440 Nm 3< / h, with a regulation ratio of 1:100.

[0043] When the Q low is 5-50 Nm 3< / h, the Q high is 50-500 Nm 3< / h, the valve group can achieve precise control and regulation of total flow within a range of 5-550 Nm 3< / h, with a regulation ratio of 1:100.

[0044] When the Q low is 10-00 Nm 3< / h, the Q high is 100-1000 Nm 3< / h, the valve group can achieve precise control and regulation of total flow within a range of 10-1100 Nm 3< / h, with a regulation ratio of 1:100.

[0045] Specifically, in Step 3, compare the design gas flow rate q of the i-th branch and the maximum gas supply value of the low-flow gas supply pipe Q low max , as well as compare the design gas flow rate q and the maximum gas supply value of the high-flow gas supply pipe Q high max , determine the gas supply principles, based on the principles, select the i-th branch as the gas supply pipe for gas supply. The gas supply principles are as follows: When q≤Q low max , select the low-flow gas supply pipe as the gas supply pipe of the i-th branch; when Q low max <q≤Q high max , select the high-flow gas supply pipe as the gas supply pipe of the i-th branch; when Q high max ≤q≤Q low max +Q high max , fully open the high-flow gas supply pipe, and adjust the flow rate of the low-flow gas supply pipe based on |q-(Q high max +Q low max )|, both the high-flow gas supply pipe and low-flow gas supply pipe jointly serve as the gas supply pipes of the i-th branch.

[0046] Through the aforementioned flow control valve group and gas supply method, the present disclosure can achieve precise regulation and control of flow rates within a wide flow range, with a high regulation ratio of up to 1:100, during converter refining.Example 1

[0047] The present example provides a high-regulation-ratio flow control valve group for converter bottom-blowing, as shown in FIG.1, including a main pipeline and branch pipelines.

[0048] The main pipeline, indicated as A in FIG.1, includes a main gas supply pipe, a ball valve, a check valve, a regulating valve, a shut-off valve, and a pressure gauge; in the direction of the gas flow, the shut-off valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are sequentially arranged on the main gas supply pipe to provide a large flow range gas supply to all branch pipelines.

[0049] The number of branch pipelines is N and shown as B-i in FIG. 1 (where i=1, 2, 3..., N), each branch pipeline includes a bypass gas supply pipe (Q-3), a low-flow gas supply pipe (Q-2), and a high-flow gas supply pipe (Q-1).

[0050] The bypass gas supply pipe is manually controlled for opening and closing, and a needle valve and a ball valve are arranged on the bypass gas supply pipe to ensure gas supply in case of abnormal operating conditions of the valve group.

[0051] The low-flow gas supply pipe is automatically controlled for opening and closing, and a ball valve, a check valve, a flow controller, and a pressure gauge are arranged on the low-flow gas supply pipe.

[0052] The high-flow gas supply pipe is automatically controlled for opening and closing, and a ball valve, a control valve, a check valve, a flow meter, and a pressure gauge are arranged on the high-flow gas supply pipe.

[0053] The main pipeline is connected in series with multiple branch pipelines to control the total flow rate of all branch pipelines.

[0054] The branch pipelines are connected in parallel, and each branch pipeline supplies gas independently.

[0055] The diameter of the main 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.

[0056] The flow rate range of the low-flow gas supply pipe is 1-10 Nm 3< / h, and the flow rate range of the high-flow gas supply pipe is 10-100 Nm 3< / h.Example 2

[0057] In the present embodiment, the gas supply flow rate q of the i-th branch in the gas supply model is divided into six flow segments: 1 Nm 3< / h, 5 Nm 3< / h, 20 Nm 3< / h, 50 Nm 3< / h, 100 Nm 3< / h, and 105 Nm 3< / h.

[0058] The gas is supplied through the flow control valve group described in Example 1, following these steps: Step 1: determine the design gas flow rate q of the i-th branch, the flow rate range of the low-flow gas supply pipe and high-flow gas supply pipe of the i-th branch; in the first flow segment: q=1 Nm 3< / h; the second flow segment: q=5 Nm 3< / h; the third flow segment: q=20 Nm 3< / h; the fourth flow segment: q=50 Nm 3< / h; the fifth flow segment: q=100 Nm 3< / h; sixth flow segment: q=105 Nm 3< / h; the flow rate range of the low-flow gas supply pipe of the i-th branch is 1-10 Nm 3< / h; the flow rate range of the high-flow gas supply pipe of the i-th branch is 10-100 Nm 3< / h.

[0059] Step 2: based on the minimum and maximum gas supply values of both the low-flow and high-flow gas supply pipes of the i-th branch, determine the gas flow rate range of both pipes, then, determine the regulation ratio according to the gas flow rate range of both pipes; when the gas flow rate of the low-flow gas supply pipe Q low =1-10 Nm 3< / h, the gas flow rate of the high-flow gas supply pipe Q high =10-100 Nm 3< / h, the valve group can achieve precise control and regulation of the total flow rate within the range of 1-110 Nm 3< / h with a regulation ratio of 1:100; thus, Q low max =10 Nm 3< / h and Q high max =100 Nm 3< / h.

[0060] Step 3: compare the design gas flow rate q of the i-th branch with the maximum gas supply values of the low-flow gas supply pipe of the i-th branch, and compare the design gas flow rate q with the maximum gas supply value of high-flow gas supply pipe; based on the comparison result, determine the gas supply principles, and select the i-th branch as the gas supply pipe according to the gas supply principles: in the first flow segment: q=1 Nm 3< / h, q≤Q low max , select the low-flow pipe as the gas supply pipe of the i-th branch; the second flow segment: q=5 Nm 3< / h, q<Q low max , select the low-flow pipe as the gas supply pipe of the i-th branch; the third flow segment: q=20 Nm 3< / h, Q low max <q<Q high max , select the high-flow pipe as the gas supply pipe of the i-th branch; the fourth flow segment: q=50 Nm 3< / h, Q low max <q<Q high max , select the high-flow pipe as the gas supply pipe of the i-th branch; the fifth flow segment: q=100 Nm 3< / h, q≤Q high max , select the high-flow pipe as the gas supply pipe of the i-th branch; the sixth flow segment: q=105 Nm 3< / h, Q high max ≤q≤Q low max +Q high max , fully open the high-flow pipe and regulate the low-flow pipe based on |q-(Q high max +Q low max )|, both the high-flow and low-flow pipes serve as the gas supply pipes of the i-th branch.

[0061] Step 4: according to the i-th branch gas supply pipe determined in Step 3, adjust the flow rate of the i-th branch, ensuring that the difference between the actual gas flow rate and the design gas flow rate q is ≤0.5 Nm 3< / h; in the first flow segment: select the low-flow pipe as the gas supply pipe of the i-th branch, adjust its flow rate, the actual flow rate of the i-th branch is 1.05 Nm 3< / h; the second flow segment: select the low-flow pipe as the gas supply pipe of the i-th branch, adjust its flow rate, the actual flow rate of the i-th branch is 1.05 Nm 3< / h; the third flow segment: select the high-flow pipe as the gas supply pipe of the i-th branch, adjust its flow rate, the actual flow rate of the i-th branch is 5.1 Nm 3< / h; the fourth flow segment: select the high-flow pipe as the gas supply pipe of the i-th branch, adjust its flow rate, the actual flow rate of the i-th branch is 49.5 Nm 3< / h; the fifth flow segment: select the high-flow pipe as the gas supply pipe of the i-th branch, adjust its flow rate, the actual flow rate of the i-th branch is 99.5 Nm 3< / h; the sixth flow segment: fully open the high-flow pipe, adjust the flow rate of the low-flow pipe according to |q-(Q high max +Q low max )|(i.e. 5 Nm 3< / h); the actual flow rate of the high-flow pipe is 99.5 Nm 3< / h, the actual flow rate of the low-flow pipe is 5.6 Nm 3< / h and the total actual flow rate of the i-th branch is 105.1 Nm 3< / h.

[0062] Step 5: according to Steps 1-4, adjust the flow rate of the remaining branch pipes so that the difference between the actual gas flow rate and the design flow rate is ≤0.5 Nm 3< / h.

[0063] The present embodiment achieves precise control and regulation of the valve group's total flow within the range of 1-110 Nm 3< / h with a regulation ratio of 1:100.

[0064] The above are merely preferred specific implementations of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any modification or replacement easily conceived by those skilled in the art within the technical scope of the present disclosure should fall within the protection scope of the present disclosure.

Claims

1. A high-regulation-ratio flow control valve group for converter bottom-blowing, wherein, comprising a main pipeline and branch pipelines; the main pipeline is connected in series with multiple branch pipelines, and the multiple branch pipelines are connected in parallel; the main pipeline comprises a main gas supply pipe, a ball valve, a check valve, a regulating valve, a shut-off valve, and a pressure gauge, and the shut-off valve, the regulating valve, the pressure gauge, the check valve, and the ball valve are sequentially arranged on the main gas supply pipe; number of branch pipelines is N, and each branch pipeline 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 for opening and closing, and a needle valve and a ball valve are arranged on the bypass gas supply pipe; the low-flow gas supply pipe is automatically controlled for opening and closing, and a ball valve, a check valve, a flow controller, and a pressure gauge are arranged on the low-flow gas supply pipe; the high-flow gas supply pipe is automatically controlled for opening and closing, and a ball valve, a regulating valve, a check valve, a flow meter, and a pressure gauge are arranged on the high-flow gas supply pipe.

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

3. The flow control valve group according to claim 1, wherein maximum gas flow rate Qlow max of the low-flow gas supply pipe is 100 Nm3 / h, and maximum gas flow rate Qhigh max of the high-flow gas supply pipe is 1000 Nm3 / h.

4. A gas supply method of a high-regulation-ratio flow control valve group for converter bottom-blowing, implemented through the flow control valve group according to any one of claims 1 to 3, comprising the following steps: step 1: determine design gas flow rate q of i-th branch as set in the gas supply model, maximum gas supply value of the low-flow gas supply pipe of the i-th branch and a maximum gas supply value of the high-flow gas supply pipe of the i-th branch; step 2: based on the minimum and maximum gas supply values of the low-flow of the i-th branch and the minimum and maximum gas supply values of the high-flow pipes of the i-th branch, determine a gas supply flow range of both the low-flow and high-flow pipes, then, determine a regulation ratio according to the gas supply flow range of the low-flow and the high-flow gas supply pipes; step 3: compare the design gas flow rate q of the i-th branch with the maximum gas supply value of the low-flow gas supply pipe of the i-th branch, and compare the design gas flow rate q of the i-th branch with the maximum gas supply value of the high-flow gas supply pipe of the i-th branch, based on the comparison result, determine gas supply principles and select the i-th branch as the gas supply pipe for gas supply according to the gas supply principles; step 4: according to the i-th branch determined in step 3, adjust flow rate of the i-th branch, ensuring that the difference between actual gas flow rate and the design gas flow rate q is ≤0.5 Nm3 / h; step 5: according to steps 1 to 4, adjust flow rate of the remaining gas supply branch pipes so that the difference between the actual gas flow rate and the design gas flow rate is ≤0.5 Nm3 / h.

5. The gas supply method according to claim 4, wherein, in step 2, the principles for achieving the regulation ratio comprise: when gas flow rate of the low-flow gas supply pipe Qlow is 1-10 Nm3 / h, regulate gas flow rate of the high-flow gas supply pipe Qhigh=10-100 Nm3 / h, total flow rate of the valve group can be controlled and regulated within a range of 1-110 Nm3 / h, with a regulation ratio of 1:100; when the gas flow rate of the low-flow gas supply pipe Qlow is 2-20 Nm3 / h, regulate the gas flow rate of the high-flow gas supply pipe Qhigh=20-200 Nm3 / h, the total flow rate of the valve group can be controlled and regulated within the range of 2-220 Nm3 / h, with a regulation ratio of 1:100.

6. The gas supply method according to claim 5, wherein, in step 2, the principles for achieving the regulation ratio also comprise: when the gas flow rate in the low-flow gas supply pipe Qlow is 3-30 Nm3 / h, regulate the gas flow rate of the high-flow gas supply pipe Qhigh=30-300 Nm3 / h, the total flow rate of the valve group can be controlled and regulated within the range of 3-330 Nm3 / h, with a regulation ratio of 1:100; when the gas flow rate of the low-flow gas supply pipe Qlow is 4-40 Nm3 / h, regulate the gas flow rate of the high-flow gas supply pipe Qhigh=40-400 Nm3 / h, the total flow rate of the valve group can be controlled and regulated within the range of 4-440 Nm3 / h, with a regulation ratio of 1:100.

7. The gas supply method according to claim 6, wherein, in step 2, the principles for achieving the regulation ratio also comprise: when the gas flow rate of the low-flow gas supply pipe Qlow is 5-50 Nm3 / h, regulate the gas flow rate of the high-flow gas supply pipe Qhigh=50-500 Nm3 / h, the total flow rate of the valve group can be controlled and regulated within the range of 5-550 Nm3 / h, with a regulation ratio of 1:100; when the gas flow rate of the low-flow gas supply pipe Qlow is 10-100 Nm3 / h, regulate the gas flow rate of the high-flow gas supply pipe Qhigh=100-1000 Nm3 / h, the total flow rate of the valve group can be controlled and regulated within the range of 10-1100 Nm3 / h, with a regulation ratio of 1:100.

8. The gas supply method according to claim 7, wherein, in step 3, the gas supply principles comprise: when q≤Qlow max, select the low-flow gas supply pipe as the gas supply pipe of the i-th branch; where q is the designed gas flow rate of the i-th branch, measured in Nm3 / h; and Qlow max is the maximum gas supply value of the low-flow gas supply pipe of the i-th branch, also measured in Nm3 / h.

9. The gas supply method according to claim 8, wherein, in step 3, the gas supply principles also comprise: when Qlow max<q≤Qhigh max, select the high-flow gas supply pipe as the supply pipe of the i-th branch; where Qhigh max is the maximum gas supply value of the high-flow gas supply pipe of the i-th branch, measured in Nm3 / h.

10. The gas supply method according to claim 9, wherein, in step 3, the gas supply principles also comprise: when Qhigh max≤q≤Qlow max+Qhigh max, select the high-flow gas supply pipe to be fully opened, and regulate the flow rate of the low-flow gas supply pipe based on |q-(Qhigh max+Qlow max)|, both the high-flow and low-flow gas supply pipes together serve as the gas supply pipes of the i-th branch.

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