A side wall metal submerged combustion device for a smelting furnace and a method of using the same

Abstract

The present invention relates to a side wall metal submerged combustion device for a smelting furnace and a method for using the device. The device is provided with a fuel gun body, a fuel and combustion-supporting agent supply source connection port and an automatic control system. The device is characterized in that: the combustion device is an integrated combustion device, provided with: a fuel gun, a nozzle is provided at the front end, a quick-install sealing plug and a fuel source interface are provided at the rear; an air sleeve is provided at the periphery, an combustion-supporting agent interface is provided on the air sleeve body, a ball valve is provided at the rear end, and a quick-install sealing plug interface for connecting the fuel gun is provided at the rear end of the ball valve; an air sleeve front port is provided at the front end of the air sleeve and is parallel to the nozzle and is passed into the smelting furnace chamber, the air sleeve front port and the nozzle are fixedly arranged on the side wall below the metal liquid level of the smelting furnace, and a cold water jacket or refractory bricks are provided at the periphery. The present invention is suitable for oxidation, reduction and combustion of a smelting furnace. It has a reasonable structural design, stable and reliable operation, safety, high degree of automation, increased metal melting temperature, and accelerated oxidation and reduction speed.

Description

Technical Field

[0001] The present invention relates to the technical field of smelting furnace combustion, and in particular to a side wall metal submerged combustion device for a smelting furnace and a use method thereof. Background Art

[0002] Traditionally, pyrometallurgy is a common smelting method for the melting and refining of non-ferrous metals. It uses the high-temperature radiant heat generated by the combustion of fuel to heat and melt on the liquid surface. The pyrometallurgy process includes two main operations, oxidation and reduction. Its main purpose is to melt the metal ore into a liquid state and then perform oxidation or reduction operations. A large amount of slag layer is produced during the melting process of the metal ore. The slag layer floats on the surface of the metal liquid to produce a heat-insulating effect, making it difficult for the radiant heat heated on the liquid surface to be transferred to the slag layer, resulting in poor oxidation-reduction effects. Therefore, it is very necessary to propose an improved combustion device to improve the efficiency of pyrometallurgy. The present invention is proposed based on the above research background, and aims to provide a side wall metal submerged combustion device for a smelting furnace and a method of using the device to meet the needs of non-ferrous metal smelting. Summary of the invention

[0003] In view of the shortcomings of the combustion device of the smelting furnace in the prior art, the present invention provides a submerged metal combustion device for the side wall of the smelting furnace and a method of using the device, which has the advantages of reasonable structural design, stable and reliable operation, high efficiency and safety, a high degree of automation, increased melting temperature of the metal under the slag layer, and accelerated oxidation-reduction speed.

[0004] In order to achieve the above object, the present invention adopts the following technical solutions:

[0005] A submerged metal combustion device for the side wall of a smelting furnace, comprising a fuel gun body, a fuel and combustion-aiding agent supply source connection port and an automatic control system, wherein the combustion device is an integrated fuel device, comprising: a fuel gun for introducing fuel, the fuel gun being provided with a tube body, a nozzle being provided at the front end of the fuel gun tube body, a quick-install sealing plug being fixedly covered on the circumference of the fuel gun tube body at the rear of the fuel gun, and an interface for connecting to a fuel source being provided at the rear end of the tube body of the fuel gun; an air sleeve for introducing combustion-aiding agent being provided on the outer periphery of the fuel gun tube body, the air sleeve being provided with a tube body, the fuel gun tube body being inserted into the tube body of the air sleeve, and the annular gap between the two tube bodies being a combustion-aiding agent channel; a combustion-aiding agent interface being provided on the air sleeve tube body and being connected to the combustion-aiding agent channel; a ball valve being provided at the rear end of the air sleeve and being connected to the air sleeve and being used to seal the inner cavity of the air sleeve, The valve body of the ball valve is an approximately arc-shaped bent circular tube, which is fixedly connected to the air sleeve at an angle toward the front end of the air sleeve. The steel ball in the ball valve is arranged in the ball valve tube body above the fuel gun tube body. When the fuel gun tube body is pulled out of the air sleeve tube body, the steel ball falls into the tube body at the rear end of the air sleeve tube body and seals the air sleeve. An interface is provided at the rear end of the ball valve, which is sealed and connected to a quick-install sealing plug fixedly arranged at the rear of the fuel gun tube body. The air sleeve, the ball valve, the interface and the quick-install sealing plug constitute a sealed air sleeve inner space at the rear of the air sleeve. An air sleeve front opening is provided at the front end of the air sleeve, which is covered at the front end of the fuel gun tube body and the periphery of the nozzle. The air sleeve front opening and the nozzle are parallelly connected to the smelting furnace. The air sleeve front opening and the nozzle are fixedly and horizontally arranged on the side wall below the metal liquid level of the smelting furnace, and a cold water jacket or refractory bricks are provided at the periphery.

[0006] The optimization scheme for further implementation and improvement of the present invention is:

[0007] The structure of the nozzle of the fuel gun is an accelerating nozzle structure: the nozzle is in the shape of a circular tube, and the shape of its inner wall is in the following order from back to front: a thorn bell mouth with a thick back and a thin front, a short tube with a thin diameter, a thorn bell mouth with a thin back and a thick front, and a front end outlet (22) with a slightly smaller diameter; the cross-sectional area of ​​the nozzle first changes from large to small and then becomes large again, and a section of a thin diameter tube passes through the middle, so that the gas or liquid passing through is accelerated; under the matched pressure, the ejected air flow or liquid flow can form a combustion space in front of the fuel gun outlet, forming combustion under the liquid surface; and the flame leaves the nozzle outlet, and also forms a relatively low temperature zone at the nozzle outlet where the combustion-supporting agent and the fuel are mixed, thereby avoiding high-temperature burning of the flame and extending the life of the nozzle.

[0008] The structure of the quick-release sealing plug fixedly arranged at the rear of the fuel gun barrel body: the quick-release sealing plug is provided with a tubular plug-in body, a plug nozzle is provided at the front end of the plug-in body, the outer diameter of the plug nozzle is consistent with the inner diameter of the interface arranged at the rear end of the ball valve, a handle and a sealing strip are provided in the middle of the plug-in body, and a fixed screw sleeve is provided at the rear end of the plug-in body. The inner wall of the screw sleeve is provided with a thread matching the screw arranged on the outer circumferential surface of the corresponding part of the fuel gun. The quick-release sealing plug quickly connects the fuel gun and the air sleeve from the rear and seals and fixes them together.

[0009] The structure of the automatic control system: the automatic control system is provided with a PLC controller and a human-computer interaction interface, the combustion-aiding agent interface is connected to the set gas mixing tank, and the gas mixing tank is connected to the oxygen source pipeline and the compressed air source pipeline; the fuel inlet of the fuel gun is connected to the pipeline of the fuel source; the oxygen source pipeline, the compressed air source pipeline, and the fuel source pipeline are respectively provided with a pressure transmitter and a flow transmitter connected to the PLC controller for pressure signals and flow signals, and a pressure regulating valve and a flow regulating valve connected to the PLC controller for regulating instruction transmission are provided; the PLC and the human-computer interaction interface are provided with an operation panel for setting pressure and flow operating parameters and controlling the operation of the automatic control system.

[0010] The automatic control system is also provided with a safety interlock control structure: a nitrogen source and a connecting pipeline are provided, a nitrogen pressure transmitter and a nitrogen quick shut-off valve are provided on the nitrogen source pipeline, and a fuel quick shut-off valve is provided on the fuel pipeline. The nitrogen pressure transmitter, the nitrogen quick shut-off valve and the fuel quick shut-off valve are connected with the PLC controller for signal and control command transmission. When the pressure of the fuel and combustion-supporting agent pipelines is lower than the normal working pressure, the PLC controller automatically instructs the fuel quick shut-off valve provided on the fuel pipeline to quickly shut off the fuel supply and send out an alarm signal to instruct personnel to check and repair; when the fuel gun nozzle is clogged and coking occurs, the natural gas flow meter value decreases, and the flow value decreases to the common value When the flow rate reaches 80% of the normal value, the PLC controller sends out an alarm signal to remind the operator to pay attention; when the flow value is reduced to 60% of the common value, the PLC controller automatically instructs the interlock quick cut-off valve set on the fuel pipeline to close the fuel gas supply, and sends out an audible and visual alarm to notify the operator to carry out maintenance; while cutting off the fuel supply, the PLC controller automatically opens the nitrogen quick cut-off valve to allow the fuel to be shut down. When the fuel supply is closed, nitrogen is introduced into the fuel gun to protect the fuel gun; and when various safety interlock actions occur, the combustion-aiding agent pipeline is always in operation to ensure that slag and molten metal will not flow back; when the nitrogen pressure on the nitrogen pipeline is lower than the set normal value, the PLC controller sends out an alarm signal to remind the operator to handle it.

[0011] A method for using a side wall metal submerged combustion device for a smelting furnace, characterized in that the method comprises the following steps:

[0012] 1) Pressure flow control of fuel and combustion aid: The oxygen content of the combustion aid can be selected according to the specific process requirements. The combustion aid pipeline is led to the valve station inlet after proportioning, and the pressure is stabilized by the pressure regulating valve: 0.05-0.5MPa, and the actual working pressure is determined by the liquid level; the combustion aid enters the combustion aid interface after pressure regulation; the fuel is led to the fuel pipeline valve station inlet, and the pressure is stabilized by the pressure regulating valve, and the fuel enters the fuel gun interface after pressure stabilization; the above can be operated manually or through the human-computer interaction interface;

[0013] 2) When the pressure flow ratio of the fuel and the combustion-supporting agent reaches the preset condition, the ignition operation is performed and the combustion device starts to operate;

[0014] 3) During the operation, the automatic control system is used to control normal operation, and in abnormal situations, alarms are issued and safety interlock control operations are initiated to ensure operation safety, equipment safety, and personnel safety.

[0015] The side wall metal submerged combustion device for a smelting furnace and the use method thereof according to the present invention have the following beneficial effects:

[0016] (1) The present invention overcomes the problem of unreasonable structural design in the prior art that two guns are used as combustion devices: one for air intake and the other for fuel intake. The present invention realizes the use of a fuel gun to complete the underwater combustion of metal. The combustion-supporting air enters from the gap between the fuel gun and the air inlet sleeve, and the underwater combustion of metal is adopted. The fuel of the fuel gun adopts the ultra-high-speed injection form, which can form a cavity in front of the gun, generate a combustion space, churn and stir the slag layer, increase the underwater temperature of the metal ore, and increase the redox efficiency.

[0017] (2) The side wall metal submerged combustion device mainly uses 99.6% pure oxygen to assist combustion, and the oxygen concentration of the combustion aid can also be adjusted within the range of 21-99.6%.

[0018] (3) A safety interlock control structure is set up to ensure the normal and safe operation of the device and timely handle abnormal operating conditions, especially to prevent accidents of molten metal or slag leakage.

[0019] (4) Side wall metal liquid submerged oxygen combustion - redox combustion device fuel / combustion air adopts programmed automatic ratio. Increasing the oxygen concentration ratio of the combustion air supply can realize oxidation operation, and reducing the oxygen concentration of the combustion air supply can realize reduction operation. The device has achieved the integration of combustion, oxidation and reduction functions.

[0020] (5) The nozzle of the side wall metal submerged combustion device is made of special heat-resistant alloy steel, with a high-speed injection structure to ensure high-temperature submerged combustion. The ball valve joint is used, which has the functions of positioning and sealing, and can ensure the rapid removal of the fuel gun; the tail end of the fuel gun adopts a quick sealing joint to match the tail end of the air sleeve, which is convenient for the rapid insertion and removal of the fuel gun and has a good sealing effect when connecting the tail end of the air sleeve during the insertion and removal process.

[0021] (6) The main fuel of the side wall metal submerged combustion device has a wide range of applications and is suitable for a variety of fuels: solid: coal powder, petroleum coke powder; liquid: heavy oil, diesel, coal tar; gas: natural gas, coal gas.

[0022] (7) The side wall metal submerged combustion device adopts PLC control automation program control, with a high degree of automation, flexible, safe and efficient operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0024] Figure 2 It is a schematic diagram of the structure of the ball valve of the present invention.

[0025] Figure 3 It is a schematic diagram of the nozzle structure of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of the quick-install sealing plug of the present invention.

[0027] Figure 5 It is a schematic diagram of the structure of the automatic control system of the present invention. DETAILED DESCRIPTION

[0028] The following is a detailed description of a submerged metal combustion device for a side wall of a smelting furnace and a method of using the device in conjunction with the accompanying drawings and embodiments.

[0029] Embodiment 1: Referring to the attached drawings, a side wall metal submerged combustion device for a smelting furnace is provided with a fuel gun body, a fuel and combustion-supporting agent supply source connection port and an automatic control system. The combustion device is an integrated combustion device that combines a conventional fuel gun and a combustion-supporting agent gun, and is provided with: a fuel gun 2 for introducing fuel, the fuel gun is provided with a pipe body, which is made of refractory metal, with a pipe diameter of DN10-DN100, and a nozzle 21 is provided at the front end of the fuel gun pipe body, which is made of special heat-resistant alloy steel 2520 or 2535 and adopts a Laval nozzle design The fuel gun has a jet speed of 200-300 m / s. The rear of the fuel gun is provided with a quick-install sealing plug 6 fixedly wrapped around the outer periphery of the fuel gun barrel, and a plate-type quick-install plug is adopted; the rear end of the fuel gun barrel is provided with an interface 7 connected to the fuel source; the outer periphery of the fuel gun barrel is provided with an air sleeve 4 for introducing a combustion-supporting agent, and the air sleeve is provided with a tube body made of ceramic, or heat-resistant steel or castable, with a tube diameter of DN20, and the fuel gun barrel is inserted into the air sleeve body, and the annular gap between the two tubes is the combustion-supporting agent channel; a gas outlet connected to the combustion-supporting agent is provided on the air sleeve body. The combustion-supporting agent interface 3 connected to the fuel gun channel is at an angle of 30-90 degrees to the air sleeve body, and is at an angle of 45 degrees in this embodiment; the rear end of the air sleeve is provided with a ball valve 5 connected to the air sleeve for sealing the inner cavity of the air sleeve, the valve body of the ball valve is an approximately arc-shaped bent circular tube, the valve body is fixedly connected to the air sleeve at an angle to the front end of the air sleeve, and the upper end 53 is sealed, and the steel ball 51 in the ball valve is arranged in the ball valve body above the fuel gun barrel body. When the fuel gun barrel body is pulled out of the air sleeve body, the steel ball falls into the body at the rear end of the air sleeve body and seals the air sleeve; An interface 52 is provided at the rear end of the ball valve, and the interface is sealingly connected to the quick-install sealing plug 6 fixedly arranged at the rear of the fuel gun barrel body. The air sleeve, the ball valve, the interface and the quick-install sealing plug constitute a sealed air sleeve inner space at the rear of the air sleeve; an air sleeve front opening 41 is provided at the front end of the air sleeve, which is covered on the outer periphery of the nozzle at the front end of the fuel gun barrel body. The air sleeve front opening and the nozzle are connected to the smelting furnace in parallel. The air sleeve front opening and the nozzle are fixedly and horizontally arranged on the side wall below the metal liquid level of the smelting furnace, and a cold water jacket or refractory bricks are provided on the outer periphery. In this embodiment, refractory bricks are used.

[0030] The quick-install sealing plug 6 fixedly arranged at the rear of the fuel gun barrel is provided with a tubular plug-in body, a plug nozzle 61 is provided at the front end of the plug-in body, and the outer diameter of the plug nozzle coincides with the inner diameter of the interface 52 arranged at the rear end of the ball valve, a handle 62 and a sealing strip 64 are provided in the middle of the plug-in body, and a fixed screw sleeve 63 is provided at the rear end of the plug-in body, and a thread matching the screw arranged on the outer circumference of the corresponding part of the fuel gun is provided on the inner wall of the screw sleeve. The quick-install sealing plug quickly plugs the fuel gun and the air sleeve from the rear and seals and fixes them together.

[0031] The automatic control system is provided with a PLC controller and 65, the human-computer interaction interface adopts Advantech industrial computer IPC-610MB MGGS 1024 general version upper software, the PLC controller adopts Siemens S7-200SMART R40, the combustion-supporting agent interface 3 is connected with the set gas mixing tank 66, and the gas mixing tank is connected with the oxygen source pipeline 61 and the compressed air source pipeline 62; the fuel inlet of the fuel gun is connected with the pipeline 63 of the fuel source; the oxygen source pipeline, the compressed air source pipeline, and the fuel source pipeline are respectively provided with pressure transmitters and flow transmitters connected with the PLC controller for pressure signals and flow signals, the pressure transmitter adopts the EJA430E model, and the flow transmitter adopts the Tianxin Instrument TDS-XXBH-0.5 / 1 .6 / 1.5; and equipped with a pressure regulating valve and a flow regulating valve connected to the PLC controller for regulating command transmission. The pressure regulating valve adopts Exxon pneumatic diaphragm single-seat pressure regulating valve TGA23D3619-NA21A3113, and the flow regulating valve adopts Exxon pneumatic diaphragm single-seat flow regulating valve TGA23D3619-NA21A3113; the PLC and human-machine interaction interface are equipped with an operation panel for setting pressure and flow operating parameters and controlling the operation of the automatic control system.

[0032] The safety interlock control structure of the automatic control system is as follows: a nitrogen source and a connecting pipeline 64 are provided, a nitrogen pressure transmitter 67 and a nitrogen quick shut-off valve 68 are provided on the nitrogen source pipeline, and a fuel quick shut-off valve 69 is provided on the fuel pipeline, and a pneumatic quick valve is used: Exxon pneumatic single-acting quick-cut ball valve PA2118110 model; the nitrogen pressure transmitter, nitrogen quick shut-off valve and fuel quick shut-off valve are connected with the PLC controller for signal and control command transmission. When the pressure of the fuel and combustion-supporting agent pipelines is lower than the normal working pressure, the PLC controller automatically instructs the fuel quick shut-off valve provided on the fuel pipeline to quickly shut off the fuel supply and send out an alarm signal to instruct personnel to check and repair; when the fuel gun nozzle is blocked and coking occurs, the sky When the gas flow counter value decreases and the flow value decreases to 80% of the normal value, the PLC controller sends out an alarm signal to remind the operator to pay attention; when the flow value decreases to 60% of the normal value, the PLC controller automatically instructs the interlock quick shut-off valve set on the fuel pipeline to close the fuel gas supply, and sends out an audible and visual alarm to notify the operator to inspect and handle it; while cutting off the fuel supply, the PLC controller automatically opens the nitrogen quick shut-off valve to allow the fuel gun to pass nitrogen when the fuel supply is closed to protect the fuel gun; and when various safety interlock actions occur, the combustion-aiding agent pipeline is always in operation to ensure that slag and molten metal will not flow back; when the nitrogen pressure on the nitrogen pipeline is lower than the set normal value, the PLC controller sends out an alarm signal to remind the operator to handle it.

[0033] Embodiment 2: A method for using a side wall submerged metal combustion device for a smelting furnace, the method comprising the following steps:

[0034] 1) Pressure flow control of fuel and combustion aid: The oxygen content of the combustion aid can be selected according to the specific process requirements. The combustion aid pipeline is led to the valve station inlet after proportioning, and the pressure is stabilized by the pressure regulating valve: 0.05-0.5MPa, and the actual working pressure is determined by the liquid level; the combustion aid enters the combustion aid interface after pressure regulation; the fuel is led to the fuel pipeline valve station inlet, and the pressure is stabilized by the pressure regulating valve, and the fuel enters the fuel gun interface after pressure stabilization; the above can be operated manually or through the human-computer interaction interface;

[0035] 2) When the pressure flow ratio of the fuel and the combustion-supporting agent reaches the preset condition, the ignition operation is performed and the combustion device starts to operate;

[0036] 3) During the operation, the automatic control system is used to control normal operation, and in abnormal situations, alarms are issued and safety interlock control operations are initiated to ensure operation safety, equipment safety, and personnel safety.

[0037] It should be pointed out that on the basis of the basic technical solution of the present invention, some technical solutions with similar changes can be made, but they should all be within the protection scope of this patent.

Claims

1. A side wall metal submerged combustion device for a smelting furnace, provided with a fuel gun body, a fuel and combustion-supporting agent supply source connection port and an automatic control system, characterized in that: The combustion device is an integrated combustion device, comprising: a fuel gun (2) for introducing fuel, the fuel gun having a tube body, a nozzle (21) at the front end of the fuel gun tube body, a quick-install sealing plug (6) fixed to the outer periphery of the fuel gun tube body at the rear of the fuel gun, and a fuel gun interface (7) connected to a fuel source at the rear end of the fuel gun tube body; an air sleeve (4) for introducing an oxidant is provided at the outer periphery of the fuel gun tube body, the air sleeve having a tube body, the fuel gun tube body is inserted into the air sleeve tube body, and the annular gap between the two tube bodies is an oxidant channel; an oxidant interface (3) connected to the oxidant channel is provided on the air sleeve tube body; a ball valve (5) connected to the air sleeve for sealing the rear of the air sleeve is provided at the rear end of the air sleeve, the valve body of the ball valve being a nearly arc-shaped bent circular tube, the valve body being inclined toward the front end of the air sleeve and being connected to the oxidant channel. The air sleeve is fixedly connected, and the upper end (53) is sealed. The steel ball (51) in the ball valve is arranged in the ball valve tube body above the fuel gun tube body. When the fuel gun tube body is pulled out of the air sleeve tube body, the steel ball falls into the tube body at the rear end of the air sleeve tube body and seals the air sleeve. A ball valve interface (52) is provided at the rear end of the ball valve, and the interface is sealed to a quick-install sealing plug (6) fixedly arranged at the rear of the fuel gun tube body. The air sleeve, the ball valve, the ball valve interface and the quick-install sealing plug form a sealed air sleeve inner space at the rear of the air sleeve. A front air sleeve opening (41) is provided at the front end of the air sleeve, which is covered on the outer periphery of the nozzle at the front end of the fuel gun tube body. The front air sleeve opening and the nozzle are parallelly connected to the smelting furnace. The front air sleeve opening and the nozzle are fixedly arranged horizontally on the side wall below the metal liquid level of the smelting furnace, and a cold water jacket or refractory bricks are provided on the outer periphery. The structure of the nozzle of the fuel gun is a high-speed nozzle structure. The nozzle is in the shape of a circular tube, and the shape of its inner wall is, from back to front, in the following order: a thorn bell mouth (25) that is thick at the back and thin at the front, a short tube with a thin diameter (24), a thorn bell mouth (23) that is thin at the back and thick at the front, and a front outlet (22) with a slightly smaller diameter. The cross-sectional area of ​​the nozzle first changes from large to small and then becomes large again, and a section of a thin-diameter tube passes through the middle, so that the gas or liquid passing through is accelerated. Under the matched pressure, the ejected airflow or liquid can form a combustion space in front of the fuel gun outlet, forming combustion below the liquid surface. Moreover, when the flame leaves the nozzle outlet, a relatively low-temperature zone is formed at the nozzle outlet where the combustion-supporting agent and the fuel are mixed, thereby avoiding high-temperature burning of the flame and extending the nozzle life. The quick-install sealing plug (6) fixedly arranged at the rear of the fuel gun barrel is provided with a tubular plug-in body, the front end of which is provided with a plug nozzle (61), the outer diameter of which matches the inner diameter of the ball valve interface (52) arranged at the rear end of the ball valve, the middle of which is provided with a handle (62) and a sealing strip (64), the rear end of which is provided with a fixing screw sleeve (63), the inner wall of which is provided with a thread matching the screw arranged on the outer peripheral surface of the corresponding part of the fuel gun, the quick-install sealing plug quickly plugs the fuel gun and the air sleeve from the rear and seals and fixes them together; The automatic control system is provided with a PLC controller and a human-machine interface (65); the combustion-supporting agent interface (3) is connected to a gas mixing tank (66), which is connected to an oxygen source pipeline (61) and a compressed air source pipeline (62); the fuel inlet of the fuel gun is connected to the pipeline of the fuel source; a pressure transmitter and a flow transmitter connected to the PLC controller for pressure signals and flow signals are respectively provided on the oxygen source pipeline, the compressed air source pipeline and the fuel source pipeline, and a pressure regulating valve and a flow regulating valve connected to the PLC controller for regulating command transmission are also provided; the PLC and the human-machine interface are provided with an operation panel for setting pressure and flow operating parameters and controlling the operation of the automatic control system; The automatic control system is also provided with a safety interlock control structure: a nitrogen source and a connecting pipeline (64) are provided, a nitrogen pressure transmitter (67) and a nitrogen quick shut-off valve (68) are provided on the nitrogen source pipeline, and a fuel quick shut-off valve (69) is provided on the fuel pipeline. The nitrogen pressure transmitter, the nitrogen quick shut-off valve and the fuel quick shut-off valve are connected to the PLC controller for signal and control command transmission. When the pressure of the fuel and combustion-supporting agent pipelines is lower than the normal working pressure, the PLC automatically instructs the fuel quick shut-off valve provided on the fuel pipeline to close and sends out an alarm signal to instruct personnel to check and repair. When the fuel gun nozzle is clogged and coking occurs, the natural gas flow meter value decreases, and the flow value decreases to the normal value. When the flow rate reaches 80% of the normal value, the PLC controller sends out an alarm signal to remind the operator to pay attention; when the flow value is reduced to 60% of the normal value, the PLC controller automatically instructs the interlock quick cut-off valve set on the fuel pipeline to close the fuel gas supply, and sends out an audible and visual alarm to notify the operator to inspect and handle it; while cutting off the fuel supply, the PLC controller automatically opens the nitrogen quick cut-off valve to allow the fuel to be shut off. When the fuel supply is closed, nitrogen is introduced into the fuel gun to protect the fuel gun; and when various safety interlock actions occur, the combustion-aiding agent pipeline is always in operation to ensure that slag and molten metal will not flow back; when the nitrogen pressure on the nitrogen pipeline is lower than the set normal value, the PLC controller sends out an alarm signal to remind the operator to handle it.

2. The method for using the side wall submerged metal combustion device for a smelting furnace according to claim 1, characterized in that: The method of use includes the following steps: 1) Pressure flow control of fuel and combustion aid: The oxygen content of the combustion aid can be selected according to the specific process requirements. The combustion aid pipeline is led to the valve station inlet after proportioning, and the pressure is stabilized by the pressure regulating valve: 0.05-0.5MPa. The actual working pressure is determined by the liquid level. The combustion aid enters the combustion aid interface after pressure regulation. The fuel is led to the fuel pipeline valve station inlet, and the pressure is stabilized by the pressure regulating valve. The fuel enters the fuel gun interface after pressure stabilization. The above is operated manually or through the human-computer interaction interface. 2) When the pressure flow ratio of the fuel and the combustion aid reaches the preset condition, the combustion device starts to operate; 3) During the operation, the automatic control system is used to control normal operation, and in abnormal situations, alarms are issued and safety interlock control operations are initiated to ensure operation safety, equipment safety, and personnel safety.

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