A mechanism for bottom blowing of gas in off-line refining
By employing a dual nitrogen and argon gas supply system in the ladle refining process and utilizing standard flow meters to ensure precise control of nitrogen and argon, the problems of high cost and frequent detection affecting production in existing technologies have been solved, achieving low-cost and continuous production.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- SICHUAN DAZHOU IRON & STEEL GROUP
- Filing Date
- 2025-05-27
- Publication Date
- 2026-06-16
AI Technical Summary
In the existing technology, when the argon gas supply flow rate/pressure is detected and adjusted to meet the gas supply requirements at different stages, the cost is high for nitrogen-containing steel grades, and the detection instruments need to be calibrated and maintained offline regularly, which affects the continuous operation of production.
A dual nitrogen and argon gas supply system is adopted, in which the supply of nitrogen and argon is controlled by nitrogen flow meters and argon flow meters respectively, and a first standard flow meter and a second standard flow meter are used as backup references to ensure the accuracy of the nitrogen flow meter, thereby achieving continuous nitrogen supply and precise control of argon.
This reduces the production cost of nitrogen-containing steel, ensures the continuity and accuracy of nitrogen supply, reduces the frequency of offline calibration of testing instruments, and improves the continuity of production.
Smart Images
Figure CN224362804U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of steelmaking technology, and in particular to a bottom blowing gas supply mechanism for ladle refining. Background Technology
[0002] Bottom blowing in the ladle is an important method of ladle refining of molten steel. Argon blowing at the bottom of the ladle creates circulation in the molten steel, and the agitation increases the chances of non-metallic inclusions in the steel colliding and growing. The rising argon bubbles not only absorb gases from the steel, promoting the removal of hydrogen and nitrogen, but also adhere to inclusions suspended in the molten steel, carrying these inclusions to the surface where they are absorbed by the slag layer. Simultaneously, it expands the slag-metal reaction surface, accelerates the transfer of reactants, and increases the reaction rate.
[0003] In existing technologies, there are methods to adapt to the gas supply requirements at different stages by detecting and adjusting the argon gas supply flow rate / pressure. However, on the one hand, the cost of argon gas is relatively high for nitrogen-containing steel grades; on the other hand, the instruments for detecting the argon gas supply flow rate / pressure need to be calibrated and maintained offline regularly, which affects the continuous operation of production. Utility Model Content
[0004] In view of the above situation, this utility model provides an external refining bottom blowing gas supply mechanism, which aims to solve the technical problems in the prior art, which uses the detection and adjustment of argon gas supply flow / pressure to adapt to the gas supply demand at different stages. However, on the one hand, the cost of argon gas is high for nitrogen-containing steel grades; on the other hand, the instruments for detecting argon gas supply flow / pressure need to be calibrated and maintained offline regularly, which affects the continuous production.
[0005] To achieve the above objectives, this utility model provides the following technical solution:
[0006] This utility model provides an external refining bottom blowing gas supply mechanism, comprising:
[0007] Bottom blowing pipeline, connected to the bottom of the ladle;
[0008] Argon gas supply pipeline, used to connect argon gas storage tank and bottom blowing pipeline;
[0009] A nitrogen supply pipeline is used to connect a nitrogen storage tank and a bottom blowing pipeline; the nitrogen supply pipeline includes a nitrogen main valve, a nitrogen flow meter, and a nitrogen flow regulating valve connected in sequence; among them, the nitrogen flow meter and the nitrogen flow regulating valve are related.
[0010] The first diversion valve is connected in series between the nitrogen main valve and the nitrogen flow meter;
[0011] The first bypass valve is connected in parallel with the nitrogen flow meter;
[0012] Second diversion valve;
[0013] The first standard flow meter, after being connected in series with the second diverter valve, is connected in parallel with the first diverter valve.
[0014] In some embodiments of this utility model, the first standard flow meter is a Coriolis mass flow meter.
[0015] In some embodiments of this utility model, a second standard flow meter and a third diverter valve are also included; the second standard flow meter and the third diverter valve are connected in series and then connected in parallel with the first diverter valve and the second diverter valve.
[0016] In some embodiments of this utility model, it further includes:
[0017] The first shut-off valve is connected in series between the first standard flow meter and the nitrogen flow meter;
[0018] The fourth diverter valve is connected in parallel with the first shut-off valve and in series with the second standard flow meter.
[0019] In some embodiments of this utility model, the argon gas supply pipeline includes an argon gas pressure reducing valve, an argon gas main valve, an argon gas filter, an argon gas flow meter, and an argon gas flow regulating valve connected in sequence, wherein the argon gas flow meter and the argon gas flow regulating valve are associated with each other.
[0020] In some embodiments of this invention, the nitrogen supply pipeline also includes a nitrogen filter.
[0021] In some embodiments of this invention, a nitrogen filter is connected between the nitrogen main valve and the nitrogen flow meter.
[0022] In some embodiments of this utility model, it further includes:
[0023] The backflush valve, nitrogen main valve, and nitrogen filter are all connected in parallel with the backflush valve;
[0024] The exhaust valve is connected between the main nitrogen valve and the nitrogen filter.
[0025] The embodiments of this utility model have at least the following advantages or beneficial effects:
[0026] 1. The choice of nitrogen gas, which is less expensive, can be determined based on whether the steel grade contains nitrogen, thus controlling costs. The nitrogen flow regulating valve adjusts the nitrogen flow rate in the nitrogen supply pipeline based on the detection data of the nitrogen flow meter, ensuring that the nitrogen flow rate reaches the predetermined value, thereby achieving precise supply of nitrogen.
[0027] 2. The nitrogen flow meter and the first standard flow meter can be connected in series. Both can detect the same nitrogen and the detection environment is the same. The detection results of the nitrogen flow meter and the first standard flow meter can be compared. If the difference is too large, it can be determined that the nitrogen flow meter is inaccurate and needs to be recalibrated and repaired.
[0028] 3. When the nitrogen flow meter needs to be recalibrated or repaired, after closing the first diversion valve and opening the second diversion valve and the first bypass valve, the nitrogen flow meter can be disassembled for offline calibration and repair. The remaining first standard flow meter can replace the nitrogen flow meter to detect the nitrogen flow rate, so as to ensure the continuous supply of nitrogen.
[0029] Other features and advantages of this invention will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the invention. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of the bottom-blowing gas supply mechanism for ladle refining.
[0032] icon:
[0033] 1-Bottom blowing pipeline,
[0034] 2-Argon gas supply pipeline, 21-Argon gas storage tank, 22-Argon gas pressure reducing valve, 23-Argon gas main valve, 24-Argon gas filter, 25-Argon gas flow meter, 26-Argon gas flow regulating valve.
[0035] 3-Nitrogen supply pipeline, 31-Nitrogen storage tank, 32-Nitrogen pressure reducing valve, 33-Nitrogen main valve, 34-Nitrogen filter, 35-Nitrogen flow meter, 36-Nitrogen flow regulating valve.
[0036] 37-First diverter valve, 38-First bypass valve, 39-First standard flow meter, 41-Second diverter valve, 42-Second standard flow meter, 43-Third diverter valve, 44-First shut-off valve, 45-Fourth diverter valve, 46-Backflush valve, 47-Discharge valve. Detailed Implementation
[0037] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the present invention.
[0038] In the description of the embodiments of this utility model, it should be understood that 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 number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the embodiments of this utility model, "multiple" means two or more, unless otherwise explicitly specified.
[0039] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.
[0040] The embodiments of this utility model will be described in detail below.
[0041] Example
[0042] See Figure 1 This embodiment provides an external refining bottom blowing gas supply mechanism, including a bottom blowing pipeline 1, an argon gas supply pipeline 2, and a nitrogen gas supply pipeline 3.
[0043] Bottom blowing line 1 is connected to the bottom of the ladle to create circulation of molten steel in the ladle.
[0044] Argon supply line 2 is used to connect argon storage tank 21 and bottom blowing line 1. Argon supply line 2 includes an argon pressure reducing valve 22, an argon main valve 23, an argon filter 24, an argon flow meter 25, and an argon flow regulating valve 26 connected in sequence, wherein the argon flow meter 25 and the argon flow regulating valve 26 are associated.
[0045] The nitrogen supply line 3 is used to connect the nitrogen storage tank 31 and the bottom blowing line 1. The nitrogen supply line 3 includes a nitrogen pressure reducing valve 32, a nitrogen main valve 33, a nitrogen filter 34, a nitrogen flow meter 35, and a nitrogen flow regulating valve 36 connected in sequence, wherein the nitrogen flow meter 35 and the nitrogen flow regulating valve 36 are associated.
[0046] After opening the argon main valve 23 and closing the nitrogen main valve 33, the argon gas in the argon storage tank 21, after being depressurized, filtered, and its flow rate regulated, enters the bottom blowing pipeline 1, and then flows into the ladle. Similarly, after opening the nitrogen main valve 33 and closing the argon main valve 23, the nitrogen gas in the nitrogen storage tank 31, after being depressurized, filtered, and its flow rate regulated, enters the bottom blowing pipeline 1, and then flows into the ladle. This allows for the selection of lower-cost nitrogen gas based on whether the steel grade contains nitrogen, thus controlling costs. The argon flow regulating valve 26 adjusts the argon flow rate in the argon supply pipeline 2 according to the detection data from the argon flow meter 25, ensuring the argon flow rate reaches a predetermined value, thereby achieving precise argon supply. The nitrogen flow regulating valve 36 adjusts the nitrogen flow rate in the nitrogen supply pipeline 3 according to the detection data from the nitrogen flow meter 35, ensuring the nitrogen flow rate reaches a predetermined value, thereby achieving precise nitrogen supply.
[0047] The bottom blowing gas supply mechanism for ladle refining also includes a first diversion valve 37, a first bypass valve 38, a first standard flow meter 39, and a second diversion valve 41.
[0048] The first diversion valve 37 is connected in series between the nitrogen filter 34 (or the nitrogen main valve 33) and the nitrogen flow meter 35.
[0049] The first bypass valve 38 is connected in parallel with the nitrogen flow meter 35.
[0050] The first standard flow meter 39 and the second diverter valve 41 are connected in series and then in parallel with the first diverter valve 37. The first standard flow meter 39 is a high-precision Coriolis mass flow meter, which serves as the reference instrument.
[0051] After opening the first diversion valve 37 and closing the second diversion valve 41 and the first bypass valve 38, nitrogen can directly enter the bottom blowing pipeline 1 from the nitrogen supply pipeline 3. After closing the first diversion valve 37 and the first bypass valve 38 and opening the second diversion valve 41, the nitrogen flow meter 35 and the first standard flow meter 39 are connected in series. In this way, both measure the same nitrogen and the same detection environment. The detection results of the nitrogen flow meter 35 and the first standard flow meter 39 can be compared. If the difference is too large, it can be determined that the nitrogen flow meter 35 is inaccurate and needs to be recalibrated and repaired. When the nitrogen flow meter 35 needs to be recalibrated and repaired, after closing the first diversion valve 37 and opening the second diversion valve 41 and the first bypass valve 38, the nitrogen flow meter 35 (the nitrogen flow meter 35 is generally detachable and installed via a flange) can be disassembled for offline calibration and repair. The remaining first standard flow meter 39 can replace the nitrogen flow meter 35 to measure the nitrogen flow rate to ensure a continuous supply of nitrogen.
[0052] The bottom-blowing gas supply mechanism for ladle refining also includes a second standard flow meter 42 and a third diverter valve 43. The second standard flow meter 42 and the third diverter valve 43 are connected in series and then in parallel with the first diverter valve 37 and the second diverter valve 41. The second standard flow meter 42 is a high-precision Coriolis mass flow meter, which serves as a backup reference instrument.
[0053] When the first standard flow meter 39 malfunctions, the first diversion valve 37 and the second diversion valve 41 can be closed, and the third diversion valve 43 can be opened. The second standard flow meter 42 can then be used to check whether the nitrogen flow meter 35 is inaccurate.
[0054] The bottom blowing gas supply mechanism for ladle refining also includes a first shut-off valve 44 and a fourth diversion valve 45.
[0055] The first shut-off valve 44 is connected in series between the first standard flow meter 39 and the nitrogen flow meter 35.
[0056] The fourth diverter valve 45 is connected in parallel with the first shut-off valve 44 and in series with the second standard flow meter 42.
[0057] By closing the first diversion valve 37, the third diversion valve 43, and the first shut-off valve 44, and opening the second diversion valve 41 and the fourth diversion valve 45, the first standard flow meter 39 and the second standard flow meter 42 can be connected in series to use the first standard flow meter 39 and the second standard flow meter 42 simultaneously. The two can be compared with each other to verify their accuracy.
[0058] The bottom blowing gas supply mechanism for ladle refining also includes a backflush valve 46 and a discharge valve 47.
[0059] The nitrogen main valve 33 and nitrogen filter 34 are both connected in parallel with the backflush valve 46.
[0060] The exhaust valve 47 is connected between the nitrogen main valve 33 and the nitrogen filter 34.
[0061] Backflush valve 46 and exhaust valve 47 are normally closed. When nitrogen filter 34 is severely clogged, nitrogen main valve 33, first diversion valve 37, second diversion valve 41 and third diversion valve 43 can be closed, and backflush valve 46 and exhaust valve 47 can be opened. Nitrogen gas enters nitrogen filter 34 in reverse to perform backflush cleaning to clear nitrogen filter 34.
[0062] In other embodiments, in order to achieve accurate online detection of argon flow meter 25 and ensure continuous argon supply, the argon supply pipeline 2 can be improved with reference to the above scheme, which will not be described in detail in this embodiment.
[0063] Finally, it should be noted that the above are merely preferred embodiments of this application and are not intended to limit this application. For those skilled in the art, this application can have various modifications and variations. Without conflict, the embodiments and features described in the embodiments of this application can be arbitrarily combined with each other. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.
Claims
1. An external refining bottom-blowing gas supply mechanism, characterized in that, include: Bottom blowing pipeline, connected to the bottom of the ladle; Argon gas supply pipeline, used to connect the argon gas storage tank and the bottom blowing pipeline; A nitrogen supply pipeline is used to connect a nitrogen storage tank and the bottom blowing pipeline; the nitrogen supply pipeline includes a nitrogen main valve, a nitrogen flow meter, and a nitrogen flow regulating valve connected in sequence; wherein the nitrogen flow meter and the nitrogen flow regulating valve are associated with each other; The first diversion valve is connected in series between the nitrogen main valve and the nitrogen flow meter; The first bypass valve is connected in parallel with the nitrogen flow meter; Second diversion valve; The first standard flow meter is connected in series with the second diverter valve and then in parallel with the first diverter valve.
2. The bottom-blowing gas supply mechanism for ladle refining according to claim 1, characterized in that, The first standard flow meter is a Coriolis mass flow meter.
3. The bottom-blowing gas supply mechanism for ladle refining according to claim 1, characterized in that, It also includes a second standard flow meter and a third diverter valve; the second standard flow meter and the third diverter valve are connected in series and then connected in parallel with the first diverter valve and the second diverter valve.
4. The bottom-blowing gas supply mechanism for ladle refining according to claim 3, characterized in that, Also includes: A first shut-off valve is connected in series between the first standard flow meter and the nitrogen flow meter; The fourth diverter valve is connected in parallel with the first shut-off valve and in series with the second standard flow meter.
5. The bottom-blowing gas supply mechanism for ladle refining according to claim 1, characterized in that, The argon gas supply pipeline includes an argon gas pressure reducing valve, an argon gas main valve, an argon gas filter, an argon gas flow meter, and an argon gas flow regulating valve connected in sequence, wherein the argon gas flow meter and the argon gas flow regulating valve are associated with each other.
6. The ladle refining bottom-blowing gas supply mechanism according to any one of claims 1 to 5, characterized in that, The nitrogen supply line also includes a nitrogen filter.
7. The bottom-blowing gas supply mechanism for ladle refining according to claim 6, characterized in that, The nitrogen filter is connected between the nitrogen main valve and the nitrogen flow meter.
8. The bottom-blowing gas supply mechanism for ladle refining according to claim 7, characterized in that, Also includes: The backflush valve, the main nitrogen valve and the nitrogen filter are both connected in parallel with the backflush valve; An exhaust valve is connected between the main nitrogen valve and the nitrogen filter.