Novel converter top-blowing valve station system and working method

Abstract

The invention discloses a novel converter top-blowing valve station system and a working method. Comprising an oxygen pipeline, a nitrogen pipeline and a carbon dioxide pipeline, an oxygen stop valve, an oxygen filter, an oxygen quick cut-off valve, an oxygen pressure regulating valve and an oxygen flow meter are sequentially arranged at the front end of the oxygen pipeline, and the oxygen pipeline is divided into two oxygen branches which are respectively provided with an oxygen branch first stop valve, an oxygen branch flow regulating valve and an oxygen branch second stop valve; the two pipelines are standby for each other; a nitrogen stop valve, a nitrogen filter, a nitrogen quick cut-off valve, a nitrogen regulating valve and a nitrogen flowmeter are sequentially arranged at the front end of the nitrogen pipeline; a carbon dioxide first stop valve, a carbon dioxide filter, a carbon dioxide rapid cut-off valve, a carbon dioxide adjusting valve and a carbon dioxide flowmeter are sequentially arranged at the front end of the carbon dioxide pipeline. The carbon dioxide pipeline is additionally arranged and connected into the oxygen pipeline, so that pure oxygen top blowing can be achieved, oxygen-carbon dioxide mixed gas top blowing can also be achieved, and the quality of steelmaking products is improved.

Description

Technical Field

[0001] The present invention relates to the field of metallurgical converter top blowing, and in particular to a novel converter top blowing valve station system and a working method. Background Art

[0002] Converter steel production in my country accounts for over 85% of total output. Converter steelmaking typically uses oxygen as the oxidant, which is blown onto the hot metal in the converter to remove impurities such as carbon, silicon, manganese, and phosphorus. After the molten steel is smelted, nitrogen is blown into the furnace through an oxygen lance to remove residue from the lining and keep it clean and smooth. Nitrogen also acts as a coolant, lowering the lining temperature and extending its service life. The oxygen and nitrogen valve stations share the same structure, with automatic cut-off switching devices used to switch between them.

[0003] Introduction to the existing converter top blowing valve station process and existing problems:

[0004] 1. The existing converter top-blowing valve station process nitrogen pipeline, after filtering, regulating, and metering, is divided into two routes, each equipped with a stop valve, a quick shut-off valve, and a check valve, to supply the oxygen lance and the backup oxygen lance. This setup results in a slow switching speed between oxygen and nitrogen.

[0005] 2. The existing converter top-blowing valve station process uses only oxygen blowing. When using pure oxygen blowing, the converter steelmaking process generates a large amount of smoke and dust, the slag iron loss is high, and the dephosphorization rate is unstable during the single-slag method. Summary of the Invention

[0006] To address the aforementioned issues with existing converter top-blowing valve station technology, the present invention provides a novel converter top-blowing valve station system and operating method. This system prevents crosstalk between oxygen and nitrogen, ensures rapid switching between them, and enables top-blowing of either pure oxygen or an oxygen-CO2 mixture, improving system efficiency and steel product quality.

[0007] In order to solve the above technical problems, the present invention provides a new converter top blowing valve station system, including an oxygen pipeline, a nitrogen pipeline and a carbon dioxide pipeline.

[0008] The front end of the oxygen pipeline is provided with an oxygen stop valve (101), an oxygen filter (102), an oxygen quick shut-off valve (103), an oxygen pressure regulating valve (104), and an oxygen flow meter (105) in sequence, and is further divided into two oxygen branches, each of which is provided with an oxygen branch first stop valve (106a / b), an oxygen branch flow regulating valve (107a / b), and an oxygen branch second stop valve (108a / b), and the two pipelines serve as backup for each other;

[0009] The front end of the nitrogen pipeline is sequentially provided with a nitrogen stop valve (301), a nitrogen filter (302), a nitrogen quick shut-off valve (303), a nitrogen regulating valve (304), and a nitrogen flow meter (305);

[0010] The front end of the carbon dioxide pipeline is provided with a carbon dioxide first stop valve (201), a carbon dioxide filter (202), a carbon dioxide quick shut-off valve (203), a carbon dioxide regulating valve (204), and a carbon dioxide flow meter (205) in sequence.

[0011] Furthermore, an oxygen branch third stop valve (109a / b), an oxygen branch quick shut-off valve (110a / b), and an oxygen branch check valve (111a / b) are sequentially arranged after each oxygen branch to supply oxygen to an oxygen gun (112a) or a spare oxygen gun (112b).

[0012] Furthermore, two nitrogen branches are connected behind the nitrogen pipeline, and are respectively provided with a nitrogen branch stop valve (306a / b), a first nitrogen branch quick shut-off valve (307a / b), a nitrogen branch discharge pipe, and a third nitrogen branch quick shut-off valve (309a / b), which are supplied to the oxygen gun (112a) and the spare oxygen gun (112b). A second nitrogen branch quick shut-off valve (308a / b) is provided on the nitrogen branch discharge pipe.

[0013] Furthermore, a second carbon dioxide stop valve (206) and a carbon dioxide check valve (207) are sequentially arranged behind the carbon dioxide pipeline, and then inserted into the oxygen branch flow regulating valve group to supply oxygen to the oxygen gun (112a) and the spare oxygen gun (112b).

[0014] Furthermore, the first quick shut-off valve (307a / b) of the nitrogen branch, the third quick shut-off valve (309a / b) of the nitrogen branch and the second quick shut-off valve (308a / b) of the nitrogen branch are interlocked: when the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are closed, the second quick shut-off valve (308a / b) of the nitrogen branch is opened; when the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are opened, the second quick shut-off valve (308a / b) of the nitrogen branch is closed.

[0015] Furthermore, the first quick shut-off valve (307a / b) of the nitrogen branch, the third quick shut-off valve (309a / b) of the nitrogen branch and the quick shut-off valve (110a / b) of the oxygen branch are interlocked: after the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are closed, the quick shut-off valve (110a / b) of the oxygen branch is opened; after the quick shut-off valve (110a / b) of the oxygen branch is closed, the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are opened.

[0016] To achieve the above object, a novel operating method of a converter top-blowing valve station of the present invention comprises the following steps:

[0017] When blowing pure oxygen for the first time, the oxygen stop valve (101), the oxygen quick shut-off valve (103), the first oxygen branch stop valve (106a), the second oxygen branch stop valve (108a), the third oxygen branch stop valve (109a), and the oxygen branch quick shut-off valve (110a) are opened, and the oxygen pressure is adjusted to a desired pressure through the oxygen pressure regulating valve (104), and the oxygen flow rate is adjusted to a desired flow rate through the oxygen branch flow regulating valve (107a) to carry out pure oxygen blowing;

[0018] When blowing the oxygen-carbon dioxide mixture for the first time, according to the above steps, the first carbon dioxide stop valve (201), the carbon dioxide quick shut-off valve (203), and the second carbon dioxide stop valve (206) are opened, and the carbon dioxide is adjusted to the required pressure and flow rate through the carbon dioxide regulating valve (204) and mixed into the oxygen to carry out the blowing of the oxygen-carbon dioxide mixture.

[0019] Furthermore, the method further comprises the following steps:

[0020] After the oxygen blowing is completed, when the slag splashing furnace is first performed to protect the furnace, the nitrogen stop valve (301), the nitrogen quick shut-off valve (303), and the nitrogen branch stop valve (306a) are opened, and the oxygen branch quick shut-off valve (110a) is closed. According to the interlocking requirements, the second nitrogen branch quick shut-off valve (308a) and the third nitrogen branch quick shut-off valve (309a) are opened, and after the oxygen is exhausted, the first nitrogen branch quick shut-off valve (307a) is opened, and the nitrogen is adjusted to the required pressure and flow rate through the nitrogen regulating valve (304) to perform the slag splashing furnace protection.

[0021] Furthermore, the method further comprises the following steps:

[0022] After the slag splashing furnace protection is completed, when normal oxygen blowing is carried out, the first nitrogen branch quick shut-off valve (307a) and the third nitrogen branch quick shut-off valve (309a) are closed, and the oxygen branch quick shut-off valve (110a) is opened according to the interlocking requirement; the oxygen pressure is adjusted to the required pressure through the oxygen pressure regulating valve (104), and the oxygen flow is adjusted to the required flow through the oxygen branch flow regulating valve (107a) to carry out pure oxygen blowing.

[0023] Furthermore, the method further comprises the following steps:

[0024] After the oxygen blowing is completed, when the normal slag splashing furnace protection is carried out, the oxygen branch quick shut-off valve (110a) is closed, and through the interlocking requirement, the second nitrogen branch quick shut-off valve (308a) and the third nitrogen branch quick shut-off valve (309a) are opened. After the oxygen is exhausted, the first nitrogen branch quick shut-off valve (307a) is opened, and the nitrogen is adjusted to the required pressure and flow rate through the regulating valve (304) to carry out the slag splashing furnace protection.

[0025] The beneficial effects of the novel converter top-blowing valve station system of the present invention are as follows:

[0026] 1. By interlocking the first quick shut-off valve (307a / b) of the nitrogen branch, the third quick shut-off valve (309a / b) of the nitrogen branch, the second quick shut-off valve (308a / b) of the nitrogen branch, and the quick shut-off valve (110a / b) of the oxygen branch, it is possible to prevent the cross-contamination of oxygen and nitrogen while ensuring rapid switching between oxygen and nitrogen.

[0027] 2. By adding a carbon dioxide pipeline and connecting it to the oxygen pipeline, both pure oxygen top blowing and oxygen-carbon dioxide mixed gas top blowing can be achieved, thereby improving the quality of steelmaking products. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a flow chart of a novel converter top-blowing valve station system according to the present invention. DETAILED DESCRIPTION

[0029] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0030] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0031] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0032] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediary, or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0033] like Figure 1 As shown, an example of the present invention provides a novel converter top-blowing valve station system, comprising: an oxygen pipeline (I), a nitrogen pipeline (III) and a carbon dioxide pipeline (II).

[0034] The front end of the oxygen pipeline (I) is provided with a stop valve (101), a filter (102), a quick shut-off valve (103), a pressure regulating valve (104), and a flow meter (105) in sequence, and is further divided into two routes, each of which is provided with a stop valve (106a / b), a flow regulating valve (107a / b), and a stop valve (108a / b). The two flow regulating valve pipelines serve as backup for each other.

[0035] The front end of the nitrogen pipeline (III) is provided with a stop valve (301), a filter (302), a quick shut-off valve (303), a regulating valve (304), and a flow meter (305) in sequence.

[0036] The front end of the carbon dioxide pipeline (II) is provided with a stop valve (201), a filter (202), a quick shut-off valve (203), a regulating valve (204), and a flow meter (205) in sequence.

[0037] After filtering, pressure regulation, flow metering and flow regulation, the oxygen pipeline (I) is divided into two routes, each of which is provided with a stop valve (109a / b), a quick shut-off valve (110a / b) and a check valve (111a / b), and then supplies oxygen to an oxygen gun (112a) and a spare oxygen gun (112b).

[0038] After filtering, regulating and metering, the nitrogen pipeline (III) is divided into two routes, each of which is provided with a stop valve (306a / b), a quick shut-off valve (307a / b), a vent pipe (including a quick shut-off valve (308a / b)), and a quick shut-off valve (309a / b), and then supplied to the oxygen gun (112a) and the standby oxygen gun (112b).

[0039] After filtering, regulating and metering, the carbon dioxide pipeline (II) is sequentially provided with a stop valve (206) and a check valve (207), and then inserted into the bypass valve group of the flow regulating valve, mixed with oxygen, and then delivered to the oxygen gun (112a) and the spare oxygen gun (112b).

[0040] The quick shut-off valve (307a / b), quick shut-off valve (309a / b) and quick shut-off valve (308a / b) of the nitrogen pipeline (III) are interlocked: when the quick shut-off valve (307a / b) and the quick shut-off valve (308a / b) are closed, the quick shut-off valve (309a / b) is opened; when the quick shut-off valve (307a / b) and the quick shut-off valve (308a / b) are opened, the quick shut-off valve (309a / b) is closed.

[0041] The quick shut-off valves (307a / b), quick shut-off valves (309a / b) and quick shut-off valves (110a / b) of the oxygen pipeline (I) and the nitrogen pipeline (III) are interlocked: after the quick shut-off valves (307a / b) and the quick shut-off valves (308a / b) are closed, the quick shut-off valves (110a / b) are opened; after the quick shut-off valves (110a / b) are closed, the quick shut-off valves (307a / b) and the quick shut-off valves (308a / b) are opened.

[0042] Copper pipe sections are used before and after the pressure regulating valve (104) and the flow regulating valve (106a / b) on the oxygen pipeline (I), and copper pipe sections are used before the oxygen gun (112a) and the spare oxygen gun (112b).

[0043] The pipe section behind the check valve (207) of the carbon dioxide pipeline (II) and the pipe section behind the quick shut-off valve (307a / b) of the nitrogen pipeline (III) are made of stainless steel, and all pipeline requirements are the same as those of the oxygen pipeline.

[0044] Preferably, when the converter adopts oxygen-carbon dioxide mixed gas top blowing, the proportion of carbon dioxide is 10% to 30%.

[0045] Preferably, the regulating valves and quick shut-off valves on the oxygen pipeline (I), nitrogen pipeline (III) and carbon dioxide pipeline (II) are pneumatic valves, the stop valves and check valves are manual valves, and the filter filtration accuracy is 60-80 mesh.

[0046] Preferably, the stop valve, check valve (111a / b) on the oxygen pipeline (I) and the check valve (207) on the carbon dioxide pipeline (II) are made of copper valves, and a copper pipe section is used after the first stop valve (101) on the oxygen pipeline (I).

[0047] The converter top-blowing valve station method in this embodiment includes the following steps:

[0048] When blowing pure oxygen for the first time, the stop valve (101), the quick shut-off valve (103), the stop valve (106a), the stop valve (108a), the stop valve (109a), and the quick shut-off valve (110a) are opened, and the oxygen pressure is adjusted to the required pressure through the pressure regulating valve (104), and the oxygen flow rate is adjusted to the required flow rate through the flow regulating valve (107a) to carry out pure oxygen blowing.

[0049] When blowing the oxygen-carbon dioxide mixture for the first time, according to the above steps, the stop valve (201), the quick shut-off valve (203), and the stop valve (206) are opened, and the carbon dioxide is adjusted to the required pressure and flow rate through the regulating valve (204) and mixed into the oxygen to carry out the blowing of the oxygen-carbon dioxide mixture.

[0050] After the oxygen blowing is completed, when the slag splashing protection is performed for the first time, the stop valve (301), the quick shut-off valve (303), and the stop valve (306a) are opened, and the quick shut-off valve (110a) is closed. According to the interlocking requirements, the quick shut-off valve (308a) and the quick shut-off valve (309a) are opened, and after the oxygen is exhausted, the quick shut-off valve (307a) is opened again, and the nitrogen is adjusted to the required pressure and flow rate through the regulating valve (304) to perform the slag splashing protection.

[0051] After the slag splashing furnace protection is completed, when normal oxygen blowing is carried out, the quick shut-off valve (307a) and the quick shut-off valve (309a) are closed, and the quick shut-off valve (110a) is opened according to the interlocking requirement. The oxygen pressure is adjusted to the required pressure through the pressure regulating valve (104), and the oxygen flow rate is adjusted to the required flow rate through the flow regulating valve (107a) to carry out pure oxygen blowing.

[0052] After the oxygen blowing is completed, when the normal slag splashing furnace protection is carried out, the quick shut-off valve (110a) is closed, and the quick shut-off valve (308a) and the quick shut-off valve (309a) are opened according to the interlocking requirements. After the oxygen is exhausted, the quick shut-off valve (307a) is opened again, and the nitrogen is adjusted to the required pressure and flow rate through the regulating valve (304) to carry out the slag splashing furnace protection.

[0053] The present invention has been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above-described embodiments. Various modifications may be made within the scope of knowledge of those skilled in the art without departing from the spirit of the present invention. Many other changes and modifications that do not depart from the spirit and scope of the present invention should be considered within the scope of protection of the present invention.

[0054] In the description of this specification, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0055] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present invention should be included in the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A novel converter top-blowing valve station system, including oxygen pipelines, nitrogen pipelines and carbon dioxide pipelines, characterized by: The front end of the oxygen pipeline is provided with an oxygen stop valve (101), an oxygen filter (102), an oxygen quick shut-off valve (103), an oxygen pressure regulating valve (104), and an oxygen flow meter (105) in sequence, and is further divided into two oxygen branches, each of which is provided with an oxygen branch first stop valve (106a / b), an oxygen branch flow regulating valve (107a / b), and an oxygen branch second stop valve (108a / b), and the two pipelines serve as backup for each other; The front end of the nitrogen pipeline is sequentially provided with a nitrogen stop valve (301), a nitrogen filter (302), a nitrogen quick shut-off valve (303), a nitrogen regulating valve (304), and a nitrogen flow meter (305); The front end of the carbon dioxide pipeline is provided with a carbon dioxide first stop valve (201), a carbon dioxide filter (202), a carbon dioxide quick shut-off valve (203), a carbon dioxide regulating valve (204), and a carbon dioxide flow meter (205) in sequence.

2. The novel converter top-blowing valve station system according to claim 1 is characterized in that: An oxygen branch third stop valve (109a / b), an oxygen branch quick shut-off valve (110a / b), and an oxygen branch check valve (111a / b) are sequentially arranged behind each oxygen branch to supply oxygen to an oxygen gun (112a) or a spare oxygen gun (112b).

3. The novel converter top-blowing valve station system according to claim 1 is characterized in that: Two nitrogen branches are connected behind the nitrogen pipeline, and are respectively provided with a nitrogen branch stop valve (306a / b), a nitrogen branch first quick shut-off valve (307a / b), a nitrogen branch discharge pipe, and a nitrogen branch third quick shut-off valve (309a / b), supplying gas to the oxygen gun (112a) and the spare oxygen gun (112b). A nitrogen branch second quick shut-off valve (308a / b) is provided on the nitrogen branch discharge pipe.

4. The novel converter top-blowing valve station system according to claim 1 is characterized by: A second carbon dioxide shut-off valve (206) and a carbon dioxide check valve (207) are sequentially arranged behind the carbon dioxide pipeline, and then inserted into the oxygen branch flow regulating valve group to supply oxygen to the oxygen gun (112a) and the spare oxygen gun (112b).

5. The novel converter top-blowing valve station system according to claim 3 is characterized by: The first quick shut-off valve (307a / b) of the nitrogen branch, the third quick shut-off valve (309a / b) of the nitrogen branch and the second quick shut-off valve (308a / b) of the nitrogen branch are interlocked: when the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are closed, the second quick shut-off valve (308a / b) of the nitrogen branch is opened; when the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are opened, the second quick shut-off valve (308a / b) of the nitrogen branch is closed.

6. The novel converter top-blowing valve station system according to claim 2 and claim 3 is characterized in that: The first quick shut-off valve (307a / b) of the nitrogen branch, the third quick shut-off valve (309a / b) of the nitrogen branch and the quick shut-off valve (110a / b) of the oxygen branch are interlocked: after the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are closed, the quick shut-off valve (110a / b) of the oxygen branch is opened; after the quick shut-off valve (110a / b) of the oxygen branch is closed, the first quick shut-off valve (307a / b) of the nitrogen branch and the third quick shut-off valve (309a / b) of the nitrogen branch are opened.

7. A novel operating method of a converter top-blowing valve station, characterized in that: The method comprises the following steps: When blowing pure oxygen for the first time, the oxygen stop valve (101), the oxygen quick shut-off valve (103), the first oxygen branch stop valve (106a), the second oxygen branch stop valve (108a), the third oxygen branch stop valve (109a), and the oxygen branch quick shut-off valve (110a) are opened, and the oxygen pressure is adjusted to a desired pressure through the oxygen pressure regulating valve (104), and the oxygen flow rate is adjusted to a desired flow rate through the oxygen branch flow regulating valve (107a) to carry out pure oxygen blowing; When blowing the oxygen-carbon dioxide mixture for the first time, according to the above steps, the first carbon dioxide stop valve (201), the carbon dioxide quick shut-off valve (203), and the second carbon dioxide stop valve (206) are opened, and the carbon dioxide is adjusted to the required pressure and flow rate through the carbon dioxide regulating valve (204) and mixed into the oxygen to carry out the blowing of the oxygen-carbon dioxide mixture.

8. The operating method of the novel converter top-blowing valve station according to claim 7, characterized in that: The following steps are also included: After the oxygen blowing is completed, when the slag splashing furnace is first performed to protect the furnace, the nitrogen stop valve (301), the nitrogen quick shut-off valve (303), and the nitrogen branch stop valve (306a) are opened, and the oxygen branch quick shut-off valve (110a) is closed. According to the interlocking requirements, the second nitrogen branch quick shut-off valve (308a) and the third nitrogen branch quick shut-off valve (309a) are opened, and after the oxygen is exhausted, the first nitrogen branch quick shut-off valve (307a) is opened, and the nitrogen is adjusted to the required pressure and flow rate through the nitrogen regulating valve (304) to perform the slag splashing furnace protection.

9. The operating method of the novel converter top-blowing valve station according to claim 7, characterized in that: The following steps are also included: After the slag splashing furnace protection is completed, when normal oxygen blowing is carried out, the first nitrogen branch quick shut-off valve (307a) and the third nitrogen branch quick shut-off valve (309a) are closed, and the oxygen branch quick shut-off valve (110a) is opened according to the interlocking requirement; the oxygen pressure is adjusted to the required pressure through the oxygen pressure regulating valve (104), and the oxygen flow is adjusted to the required flow through the oxygen branch flow regulating valve (107a) to carry out pure oxygen blowing.

10. The operating method of the novel converter top-blowing valve station according to claim 7, characterized in that: The following steps are also included: After the oxygen blowing is completed, when the normal slag splashing furnace protection is carried out, the oxygen branch quick shut-off valve (110a) is closed, and through the interlocking requirement, the second nitrogen branch quick shut-off valve (308a) and the third nitrogen branch quick shut-off valve (309a) are opened. After the oxygen is exhausted, the first nitrogen branch quick shut-off valve (307a) is opened, and the nitrogen is adjusted to the required pressure and flow rate through the regulating valve (304) to carry out the slag splashing furnace protection.

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