Oxygen lance valve station control system and oxygen lance valve station control method

Abstract

The present invention discloses an oxygen lance valve station control system and an oxygen lance valve station control method, and relates to the technical field of oxygen bottom blowing smelting. The oxygen lance valve station control system of the present invention comprises a lance body, a first branch pipe, a second branch pipe, a third branch pipe, a flow sensor and a controller, the lance body having a first channel and a second channel, the first branch pipe being connected to the first channel and used for conveying oxygen-enriched air, the second branch pipe being connected to the second channel and used for conveying protective gas, the third branch pipe being used for conveying oxygen and being connected to the first branch pipe or the second branch pipe, the flow sensor being arranged on the first branch pipe and being connected to the controller, the flow sensor being used for conveying the measured flow value to the controller, and the controller being connected to the control valve to control the opening or closing of the control valve. The oxygen lance valve station control system of the present invention can accurately control the cooling effect of the oxygen lance, and ensure the normal use of the oxygen lance and the smelting efficiency of the smelting furnace while extending the service life of the oxygen lance.

Description

Technical Field

[0001] The present invention relates to the technical field of oxygen bottom blowing smelting, and in particular to an oxygen lance valve station control system and an oxygen lance valve station control method. Background Art

[0002] The oxygen lance is the core device of oxygen bottom-blown copper smelting, oxygen bottom-blown copper matte continuous blowing, bottom-blown lead smelting, etc. The oxygen lance is used to deliver the process gas (oxygen) required for smelting and blowing into the furnace. It has the advantages of low energy consumption, less pollution, high efficiency, and good operating environment. However, during use, the oxygen lance is partially in a high-temperature environment, has a short service life, and needs to be regularly repaired and replaced, which affects the smelting operation rate and production cost.

[0003] In the related art, the oxygen lance is protected by introducing a cooling protective gas into the oxygen lance. However, the cooling effect of the protective gas on the oxygen lance cannot be accurately controlled, and there are problems such as the cooling effect failing to meet the requirements, causing the oxygen lance to burn out easily, and excessive cooling of the oxygen lance causing metal solution nodules to form at the outlet of the oxygen lance in the smelting furnace, thereby hindering the delivery of oxygen and affecting the smelting efficiency of the smelting furnace. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, an embodiment of the present invention proposes an oxygen lance valve station control system, which can accurately control the cooling effect of the oxygen lance, while extending the service life of the oxygen lance and ensuring the normal use of the oxygen lance and the smelting efficiency of the smelting furnace.

[0006] The embodiment of the present invention also provides an oxygen lance valve station control method.

[0007] The oxygen lance valve station control system of the embodiment of the present invention includes:

[0008] A gun body, wherein the gun body is partially inserted into the inner cavity of the smelting furnace, and the gun body has a first channel and a second channel communicating with the inner cavity of the smelting furnace;

[0009] a first branch pipe, the first branch pipe being connected to the first channel and used for conveying oxygen-enriched air;

[0010] a second branch pipe, the second branch pipe being connected to the second channel and used for conveying protective gas;

[0011] a third branch pipe, wherein a control valve is disposed on the third branch pipe, the third branch pipe is used to transport oxygen-containing gas, the oxygen concentration in the oxygen-containing gas is greater than the oxygen concentration in the oxygen-enriched air, and the third branch pipe is used to be connected to the first branch pipe or the second branch pipe;

[0012] A flow sensor and a controller, wherein the flow sensor is arranged on the first branch pipe and connected to the controller, the flow sensor is used to measure the gas flow in the first branch pipe and transmit the measured flow value to the controller, the controller is connected to the control valve, the controller is used to open the control valve to connect the third branch pipe when the measured flow value is less than a first set value, and is used to close the control valve to isolate the third branch pipe when the measured flow value is greater than a second set value, and the second set value is greater than the first set value.

[0013] The oxygen lance valve station control system of the embodiment of the present invention can accurately control the cooling effect of the oxygen lance, thereby extending the service life of the oxygen lance and ensuring the normal use of the oxygen lance and the smelting efficiency of the smelting furnace.

[0014] In some embodiments, the gun body includes a first main pipe, a second main pipe and a third main pipe. The gun body is provided with multiple first branch pipes connected in parallel to the first main pipe, the second branch pipes connected in parallel to the second main pipe, and multiple third branch pipes connected in parallel to the third main pipe.

[0015] In some embodiments, it includes a first sub-tube and a second sub-tube, a gas mixer is provided at the input end of the first main pipe, the first sub-tube and the second sub-tube are respectively provided at the input ends of the gas mixer, the first sub-tube is used to transport oxygen, and the second sub-tube is used to transport air.

[0016] In some embodiments, the gas flow rate during normal delivery of oxygen-enriched air in the first branch pipe is defined as q, the first set value is a, and the second set value is b. Then the value range of the first set value satisfies: a≤0.6q, and the value range of the second set value satisfies: q≥b≥0.9q.

[0017] In some embodiments, a pressure sensor is included, which is arranged in the first branch and connected to the controller. The pressure sensor is used to measure the gas delivery pressure in the first branch and transmit the measured pressure value to the controller. The controller is connected to the control valve. The controller is used to open the control valve to connect the third branch when the measured pressure value is greater than a third set value, and to close the control valve to isolate the third branch when the measured pressure value is less than a fourth set value. The third set value is greater than the fourth set value.

[0018] In some embodiments, the gas pressure of oxygen-enriched air during normal delivery in the first branch pipe is defined as p, the third set value is m, and the fourth set value is n. Then, the value range of the third set value satisfies: m≥1.5p, and the value range of the fourth set value satisfies: 1.1p≥n≥p.

[0019] In some embodiments, the axis of the first channel is coaxially arranged with the axis of the gun body, and the second channel is coaxially arranged with the first channel and sleeved on the outside of the first channel; or the second channel includes a plurality of diversion channels, and the plurality of diversion channels are spaced around the first channel, and the axis of the diversion channel is parallel to the axis of the first channel.

[0020] In some embodiments, the oxygen concentration in the oxygen-enriched air in the first branch pipe is not less than 21%, and the oxygen concentration in the oxygen-containing gas in the third branch pipe is not less than 80%.

[0021] In some embodiments, the concentration of oxygen in the protective gas is less than the concentration of oxygen in the oxygen-enriched air, and the protective gas is cooling nitrogen or cooling air.

[0022] The oxygen lance valve station control method of the embodiment of the present invention includes the oxygen lance valve station control system of any of the above embodiments, including the following steps:

[0023] S1: connected to the first branch pipe to deliver oxygen-enriched air to the first channel, and connected to the second branch pipe to deliver protective gas to the second channel;

[0024] S2: Detecting the gas delivery flow rate in the first branch pipe by means of a flow sensor, and transmitting the measured flow data to the controller for comparison with the first set value and the second set value;

[0025] S3: If the measured flow value is less than the first set value, the control valve is opened to connect the third branch pipe to transport the oxygen-containing gas to the first branch pipe or the second branch pipe; if the measured flow value is greater than the second set value and the control valve is in an open state, the control valve is closed to isolate the third branch pipe;

[0026] S4: Repeat steps S2 and S3 to monitor and adjust the gas delivery flow rate in the first branch pipe connected to the gun body in real time. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the structure of the oxygen lance valve station control system according to an embodiment of the present invention.

[0028] Figure 2 It is a schematic diagram of the structure of an oxygen lance valve station control system according to another embodiment of the present invention.

[0029] Reference numerals:

[0030] The first branch pipe 1; the second branch pipe 2; the third branch pipe 3; the control valve 31; the flow sensor 4; the first main pipe 5; the second main pipe 6; the third main pipe 7; the first sub-pipe 8; the second sub-pipe 9; the gas mixer 10; and the pressure sensor 11. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but should not be understood as limiting the present invention.

[0032] like Figure 1 and Figure 2 As shown, the oxygen lance valve station control system of the embodiment of the present invention includes a lance body, a first branch pipe 1, a second branch pipe 2, a third branch pipe 3, a flow sensor 4 and a controller. The lance body is partially inserted into the inner cavity of the smelting furnace. The lance body has a first channel and a second channel connected to the inner cavity of the smelting furnace. The first branch pipe 1 is connected to the first channel, and the first branch pipe 1 is used to transport oxygen-enriched air to the first channel. The second branch pipe 2 is connected to the second channel, and the second branch pipe 2 is used to transport protective gas to the second channel. The third branch pipe 3 is provided with a control valve 31, as shown in FIG. Figure 1 As shown, the third branch pipe 3 is connected to the first branch pipe 1 for conveying oxygen-containing gas to the first branch pipe 1, or as shown in Figure 2 As shown, the third branch pipe 3 is connected to the second branch pipe 2 for conveying oxygen-containing gas to the second branch pipe 2, the oxygen concentration in the oxygen-containing gas is greater than the oxygen concentration in the oxygen-enriched air, the flow sensor 4 is arranged on the first branch pipe 1 and connected to the controller, the flow sensor 4 is used to measure the gas conveying flow in the first branch pipe 1 and convey the measured flow value to the controller, the controller is connected to the control valve 31, the controller is used to open the control valve 31 when the measured flow value is less than the first set value to connect the third branch pipe 3 to convey the oxygen-containing gas to the first branch pipe 1 or the second branch pipe 2, and is used to close the control valve 31 when the measured flow value is greater than the second set value to cut off the third branch pipe 3, the second set value is greater than the first set value.

[0033] When the oxygen lance valve station control system of the embodiment of the present invention is in use, the first branch pipe 1 delivers oxygen-enriched air to the inner cavity of the smelting furnace through the first channel to ensure the progress of the smelting reaction, and the second branch pipe 2 delivers protective gas to the lance body through the second channel to cool the lance body. The gas delivery flow in the first branch pipe 1 is monitored in real time by the flow sensor 4, and the measured flow value is transmitted to the controller. If the measured flow value is less than the first set value, there is a situation where the melt is agglomerated at the outlet of the first channel to block the first channel, and the control valve 31 is opened to connect the third branch pipe 3, and the third branch pipe 3 is connected to the third branch pipe 3. Pipe 3 is connected with the first branch pipe 1 or the second branch pipe 2, and the oxygen-containing gas in the third branch pipe 3 increases the proportion of oxygen in the gas per unit volume transported to the inner cavity of the smelting furnace, thereby increasing the smelting reaction efficiency in the smelting furnace to increase the heat generation, and then melts the metal nodule appearing at the outlet position of the first channel of the gun body in the smelting furnace to ensure the normal transportation of the first channel. If the measured flow value is greater than the second set value and the control valve 31 is in the open state, the control valve 31 is closed to isolate the third branch pipe 3, and stop the third branch pipe 3 from transporting the oxygen-containing gas to the first branch pipe 1 or the second branch pipe 2.

[0034] The oxygen lance valve station control system of the embodiment of the present invention increases the proportion of oxygen in the unit volume of gas transported into the smelting furnace through the third branch pipe 3, controls the reaction efficiency of the melt at the lance outlet position in the smelting furnace, and then promptly eliminates the metal melt lumps appearing at the corresponding oxygen lance outlet position in the smelting furnace, thereby achieving precise control of the cooling effect of the oxygen lance, and extending the service life of the oxygen lance while ensuring the normal use of the oxygen lance and the smelting efficiency of the smelting furnace.

[0035] Optionally, the oxygen concentration in the oxygen-enriched air in the first branch pipe 1 is not less than 21%, and the oxygen concentration in the oxygen-containing gas in the third branch pipe 3 is not less than 80%. When the oxygen-containing gas is transported to the first branch pipe or the second branch pipe through the third branch pipe 3, the oxygen in the smelting furnace can be quickly supplemented, and the adjustment speed can be accelerated, so as to ensure the normal use of the oxygen gun and the smelting efficiency of the smelting furnace.

[0036] In some embodiments, Figure 1 and Figure 2 As shown, it includes a first main pipe 5, a second main pipe 6 and a third main pipe 7. The gun body is provided with multiple first branch pipes 1 connected in parallel to the first main pipe 5, the second branch pipe 2 connected in parallel to the second main pipe 6, and multiple third branch pipes 3 connected in parallel to the third main pipe 7.

[0037] In the oxygen lance valve station control system, there are multiple oxygen lances operating at the same time. By setting the first main pipe 5, the second main pipe 6 and the third main pipe 7, the unified delivery of oxygen-enriched air or protective gas to multiple lance bodies can be achieved. The operation is convenient and can provide a basis for the individual control of each lance body, which is convenient for the development of real-time monitoring and individual adjustment of the control system.

[0038] Optionally, the first branch pipe 1 is provided with a first valve, the second branch pipe 2 is provided with a second valve, and both the first valve and the second valve are connected to the controller.

[0039] In some embodiments, Figure 1 and Figure 2 As shown, it includes a first sub-tube 8 and a second sub-tube 9. A gas mixer 10 is provided at the input end of the first main pipe 5. The first sub-tube 8 and the second sub-tube 9 are respectively provided at the input ends of the gas mixer 10. The first sub-tube 8 is used to transport oxygen, and the second sub-tube 9 is used to transport air.

[0040] By setting the first sub-pipe 8 and the second sub-pipe 9, the concentration of the oxygen-enriched air entering the first main pipe 5 can be controlled and adjusted to meet the needs of the smelting furnace under normal transportation conditions and to meet the needs of oxygen-enriched air under different smelting conditions, thereby facilitating the adjustment of the concentration of the oxygen-enriched air entering the first channel.

[0041] In some embodiments, the gas flow rate of oxygen-enriched air during normal transportation in the first branch pipe 1 is defined as q, the first set value is a, and the second set value is b. The value range of the first set value satisfies: a≤0.6q, and the value range of the second set value satisfies: q≥b≥0.9q.

[0042] Specifically, in the oxygen bottom blowing copper smelting production line, the first branch pipe 1 transports oxygen-enriched air with a flow rate of 3000 Nm³ / h, the second branch pipe transports compressed air with a flow rate of 1500 Nm³ / h, and when the flow rate in the first pipe is reduced to 1800 Nm³ / h, the control valve 31 is opened by the controller to connect the third branch pipe 3, and the oxygen-containing gas with a flow rate of 1000 Nm³ / h to 2000 Nm³ / h is introduced into the first branch pipe 1 or the second branch pipe 2 through the third branch pipe 3 to adjust the oxygen concentration and increase the oxygen concentration until the gas delivery flow rate in the first branch pipe 1 returns to normal, and then the control valve 31 is closed to isolate the third branch pipe 3.

[0043] In the oxygen bottom-blown copper matte continuous blowing production line, air mixed with oxygen is transported in the first branch pipe 1 with a flow rate of 3000 Nm³ / h, oxygen is transported in the first sub-pipe 8 with a flow rate of 1000 Nm³ / h, air is transported in the second sub-pipe 9 with a flow rate of 2000 Nm³ / h, and nitrogen is transported in the second branch pipe 2. When the flow rate is reduced to 1800 Nm³ / h, the controller controls the control valve 31 to open the third branch pipe 3, and oxygen-containing gas with a flow rate of 600Nm³ / h to 1600Nm³ / h is introduced into the first branch pipe 1 or the second branch pipe 2 through the third branch pipe 3 to adjust the oxygen concentration and increase the oxygen concentration until the gas transport flow rate in the first branch pipe 1 returns to normal and then the third branch pipe 3 is closed.

[0044] In some embodiments, Figure 1 and Figure 2 As shown, it includes a pressure sensor 11, which is arranged in the first branch pipe 1 and connected to the controller. The pressure sensor 11 is used to measure the gas pressure in the first branch pipe 1 and transmit the measured pressure value to the controller. The controller is used to open the control valve 31 to connect the third branch pipe 3 when the measured pressure value is greater than the third set value, and is used to close the control valve 31 to isolate the third branch pipe 3 when the measured pressure value is less than the fourth set value. The third set value is greater than the fourth set value.

[0045] The controller is connected to the pressure sensor 11, and the gas delivery pressure is monitored on the basis of monitoring the gas delivery flow rate, so as to ensure the normal judgment of the controller on the gas delivery in the first branch pipe 1, thereby improving the reliability of the valve station control system.

[0046] In some embodiments, the gas pressure of oxygen-enriched air in the first branch pipe 1 during normal transportation is defined as p, the third set value is m, and the fourth set value is n. The value range of the third set value satisfies: m≥1.5p, and the value range of the fourth set value satisfies: 1.1p≥n≥p.

[0047] Specifically, in the oxygen bottom blowing copper smelting production line, the gas delivery pressure in the first branch pipe 1 is 0.6MPa. When the gas delivery flow in the first branch pipe 1 decreases and the gas delivery pressure increases to 0.9MPa, the control valve 31 is opened to connect the third branch pipe 3, and oxygen-containing gas is delivered to the first branch pipe 1 or the second branch pipe 2 through the third branch pipe 3, so as to adjust the oxygen concentration in the gas delivered to the inner cavity of the smelting furnace, increase the oxygen concentration, so as to improve the reaction efficiency of the melt in the smelting furnace, increase the reaction heat to melt the metal nodule corresponding to the gun body in the smelting furnace, and when the gas delivery pressure in the first branch pipe 1 is lower than 0.66, that is, the first pipeline delivers oxygen-enriched air normally, at this time, the controller drives the control valve 31 to close to restore the normal delivery of the first branch pipe 1 and the second branch pipe 2.

[0048] In the oxygen bottom-blown copper matte continuous blowing production line, the gas delivery pressure in the first branch pipe 1 is 1.0MPa. When the gas delivery flow in the first branch pipe 1 decreases and the gas delivery pressure reaches 1.5MPa, the control valve 31 is opened to connect the third branch pipe 3, and oxygen-containing gas is delivered to the first branch pipe 1 or the second branch pipe 2 through the third branch pipe 3, so as to adjust the oxygen concentration in the gas delivered to the inner cavity of the smelting furnace, increase the oxygen concentration, so as to improve the reaction efficiency of the melt in the smelting furnace, increase the reaction heat to melt the metal nodule corresponding to the gun body in the smelting furnace, and ensure the normal supply of oxygen-enriched air in the first branch pipe 1. When the gas delivery pressure in the first branch pipe 1 is lower than 1.1MPa, that is, the first pipeline normally delivers oxygen-enriched air, at this time, the controller drives the control valve 31 to close to restore the normal delivery of the first branch pipe 1 and the second branch pipe 2.

[0049] In some embodiments, the axis of the first channel is coaxially arranged with the axis of the gun body, and the second channel is coaxially arranged with the first channel and is sleeved on the outside of the first channel. By sleeved the second channel on the outside of the first channel, it is convenient to cool the surrounding side of the gun body and increase the cooling speed. At the same time, the first channel is protected, and the structure is safe and reliable.

[0050] In some embodiments, the second channel includes multiple diversion channels, and the multiple diversion channels are arranged at intervals around the first channel, and the axis of the diversion channel is parallel to the axis of the first channel. By setting the second channel as multiple diversion channels, the overall structural strength of the gun body is ensured when the second channel is set, and the multiple diversion channels can ensure the normal delivery of gas, thereby extending the service life of the gun body.

[0051] In some embodiments, the protective gas is cooling nitrogen or cooling air, which is easy to prepare and has low cost.

[0052] The following describes an oxygen lance valve station control method according to an embodiment of the present invention.

[0053] The oxygen lance valve station control method of an embodiment of the present invention includes an oxygen lance valve station control system of any of the above embodiments, including the following steps: S1: connecting the first branch pipe 1 and conveying oxygen-enriched air into the first channel, and connecting the second branch pipe 2 to convey protective gas into the second channel; S2: detecting the gas delivery flow in the first branch pipe 1 through the flow sensor 4, and transmitting the measured flow data to the controller for comparison with the first set value and the second set value; S3: if the measured flow value is less than the first set value, opening the control valve 31 to connect the third branch pipe 3 and the first channel, if the measured flow value is greater than the second set value and the control valve 31 is in an open state, closing the control valve 31 to isolate the third branch pipe 3 and the first channel; S4: repeating steps S2 and S3 to achieve real-time monitoring and adjustment of the gas delivery flow in the first branch pipe 1.

[0054] The oxygen lance valve station control method of the present invention can realize real-time monitoring of the oxygen lance flow rate through a controller to meet the needs of timely adjustment of the lance body temperature, timely eliminate metal solution nodules appearing at the corresponding oxygen lance outlet position in the smelting furnace, and realize precise control of oxygen lance cooling. While extending the service life of the oxygen lance, it ensures the normal use of the oxygen lance and the smelting efficiency of the smelting furnace.

[0055] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0056] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0057] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, or it can be connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0058] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0060] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. An oxygen lance valve station control system, characterized in that: include: A gun body, wherein the gun body is partially inserted into the inner cavity of the smelting furnace, and the gun body has a first channel and a second channel communicating with the inner cavity of the smelting furnace; a first branch pipe, the first branch pipe being connected to the first channel and used for conveying oxygen-enriched air; a second branch pipe, the second branch pipe being connected to the second channel and used for conveying protective gas; a third branch pipe, wherein a control valve is disposed on the third branch pipe, the third branch pipe is used to transport oxygen-containing gas, the oxygen concentration in the oxygen-containing gas is greater than the oxygen concentration in the oxygen-enriched air, and the third branch pipe is used to be connected to the first branch pipe or the second branch pipe; A flow sensor and a controller, wherein the flow sensor is arranged on the first branch pipe and connected to the controller, the flow sensor is used to measure the gas flow in the first branch pipe and transmit the measured flow value to the controller, the controller is connected to the control valve, the controller is used to open the control valve to connect the third branch pipe when the measured flow value is less than a first set value, and is used to close the control valve to isolate the third branch pipe when the measured flow value is greater than a second set value, and the second set value is greater than the first set value.

2. The oxygen lance valve station control system according to claim 1, characterized in that: It comprises a first main pipe, a second main pipe and a third main pipe, and the gun body is provided with a plurality of them. A plurality of the first branch pipes are arranged in parallel with the first main pipe, a second branch pipe is arranged in parallel with the second main pipe, and a plurality of the third branch pipes are arranged in parallel with the third main pipe.

3. The oxygen lance valve station control system according to claim 2, characterized in that: It comprises a first sub-tube and a second sub-tube, a gas mixer is arranged at the input end of the first main pipe, the first sub-tube and the second sub-tube are arranged at the input ends of the gas mixer respectively, the first sub-tube is used for conveying oxygen, and the second sub-tube is used for conveying air.

4. The oxygen lance valve station control system according to claim 1, characterized in that: The gas flow rate of oxygen-enriched air in the first branch pipe during normal transportation is defined as q, the first set value is a, and the second set value is b. The value range of the first set value satisfies: a≤0.6q, and the value range of the second set value satisfies: q≥b≥0.9q.

5. The oxygen lance valve station control system according to claim 1, characterized in that: It includes a pressure sensor, which is arranged on the first branch pipe and connected to the controller. The pressure sensor is used to measure the gas delivery pressure in the first branch pipe and transmit the measured pressure value to the controller. The controller is connected to the control valve. The controller is used to open the control valve to connect the third branch pipe when the measured pressure value is greater than a third set value, and to close the control valve to cut off the third branch pipe when the measured pressure value is less than a fourth set value. The third set value is greater than the fourth set value.

6. The oxygen lance valve station control system according to claim 5, characterized in that: The gas pressure of the oxygen-enriched air in the first branch pipe during normal transportation is defined as p, the third set value is defined as m, and the fourth set value is defined as n. Then, the value range of the third set value satisfies: m≥1.5p, and the value range of the fourth set value satisfies: 1.1p≥n≥p.

7. The oxygen lance valve station control system according to claim 1, characterized in that: The axis of the first channel is coaxially arranged with the axis of the gun body, and the second channel is coaxially arranged with the first channel and sleeved on the outside of the first channel; or the second channel includes a plurality of diversion channels, and the plurality of diversion channels are spaced around the first channel, and the axis of the diversion channel is parallel to the axis of the first channel.

8. The oxygen lance valve station control system according to claim 1, characterized in that: The oxygen concentration in the oxygen-enriched air in the first branch pipe is not less than 21%, and the oxygen concentration in the oxygen-containing gas in the third branch pipe is not less than 80%.

9. The oxygen lance valve station control system according to claim 1, characterized in that: The concentration of oxygen in the protective gas is lower than the concentration of oxygen in the oxygen-enriched air, and the protective gas is cooling nitrogen or cooling air.

10. An oxygen lance valve station control method, comprising the oxygen lance valve station control system according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: connected to the first branch pipe to deliver oxygen-enriched air to the first channel, and connected to the second branch pipe to deliver protective gas to the second channel; S2: Detecting the gas delivery flow rate in the first branch pipe by means of a flow sensor, and transmitting the measured flow data to the controller for comparison with the first set value and the second set value; S3: If the measured flow value is less than the first set value, the control valve is opened to connect the third branch pipe to transport the oxygen-containing gas to the first branch pipe or the second branch pipe; if the measured flow value is greater than the second set value and the control valve is in an open state, the control valve is closed to isolate the third branch pipe; S4: Repeat steps S2 and S3 to monitor and adjust the gas delivery flow rate in the first branch pipe connected to the gun body in real time.

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