A smelting furnace system based on brown gas ultra-high temperature combustion

Abstract

The application provides a melting furnace system based on Brown gas superhigh-temperature combustion, which can improve the safety during use of the melting furnace and can safely use Brown gas as a heat source of the melting furnace. A gas storage tank is arranged between a Brown gas burner and a Brown gas generating device, so that stable gas supply for the Brown gas burner can be realized; a flame arrester is arranged between the Brown gas burner and the gas storage tank, so that the risk of pipeline backfire can be eliminated; a porous burner nozzle is arranged in the Brown gas burner, Brown gas is guided to the burner nozzle through a Brown gas guide pipe and is uniformly sprayed out, so that uniform combustion of the Brown gas can be ensured; the Brown gas guide pipe and the burner nozzle are arranged in an inner cavity of a burner sleeve, primary air is introduced into the inner cavity of the burner sleeve through a primary air interface in the same direction as the Brown gas flow, the Brown gas and the primary air are mixed at the burner nozzle and then are combusted, and then the combustion gas is sprayed into an inner cavity of a melting furnace body through a burner protection cover, so that the risk of Brown gas backfire is reduced.

Description

Technical Field

[0001] This utility model relates to the field of high-temperature smelting technology, specifically a melting furnace system based on ultra-high temperature combustion of Brown gas. Background Technology

[0002] In metal smelting, hazardous waste treatment, and glass manufacturing, melting furnaces are common reaction equipment. For example, the technical solutions disclosed in patent documents with publication numbers CN119309217A and CN217464441U represent melting furnace systems currently in use by our company. Commonly used melting furnaces include electric arc furnaces and natural gas / coke furnaces. However, in practical use, traditional melting furnaces have been found to have many drawbacks, such as: the upper temperature limit of natural gas / coke furnaces is approximately 1600℃, making it difficult to handle high-melting-point materials (such as molybdenum, tungsten, and ceramics); and the generation of CO2 and NO by carbon-based fuels. x Emissions from such sources will cause pollution problems, requiring a corresponding exhaust gas treatment system, which leads to high system operating costs. While the temperature of a typical electric arc furnace is between 1600 and 2000 degrees Celsius, and some types can exceed 2000 degrees Celsius, overall, electric arc furnaces have high energy consumption, resulting in higher operating costs.

[0003] To reduce energy consumption and increase melting temperature, some technicians have considered introducing Brown's gas as fuel for melting furnaces. Brown's gas is a mixture of hydrogen and oxygen, with a combustion temperature reaching 2800℃ (theoretical value), and its product is only water vapor, making it a clean energy source. Brown's gas can be used to achieve ultra-high temperature (above 2500℃) melting. Although Brown's gas is generated through electrolysis, its energy consumption is lower than that of electric arc furnaces. However, in practical applications, Brown's gas carries the risk of backfire and explosion, and the positive pressure environment inside the furnace exacerbates the risk of gas leakage. Therefore, the use of Brown's gas in industrial applications has been limited. Summary of the Invention

[0004] To address the safety risks associated with using Brown gas in existing melting furnaces, this invention provides a melting furnace system based on ultra-high temperature combustion of Brown gas, which improves the safety of the melting furnace during operation and enables the safe use of Brown gas as a heat source.

[0005] The structure of this utility model is as follows: a melting furnace system based on ultra-high temperature combustion of Brown gas, which includes: a melting furnace body, a feeding system, a Brown gas burner and a furnace tail water quenched slag conveying system, characterized in that: the melting furnace body is a cubic structure with a rectangular cross-section and an arched top. The furnace wall structure of the melting furnace body includes: a high-temperature resistant layer, a heat insulation layer, and a cooling support layer arranged from the inside out; The bottom plate of the melting furnace body is set as an inclined surface with one end higher than the other along the length direction. The feeding system is set at the higher end of the bottom plate and is arranged on both sides of the width direction of the melting furnace body. The discharge port is set at the lower end of the bottom plate, and the furnace tail water quenched slag conveying system is connected to the discharge port. The Brown gas burners are evenly arranged on the side walls of the melting furnace body on both sides in the width direction; A gas storage tank is provided between the Brown gas generator and the Brown gas burner; A flame arrester is installed on the gas supply line between each Brown gas burner and the gas storage tank; The Brown gas burner includes: a burner sleeve, a Brown gas duct, and a burner nozzle. The burner sleeve has a cylindrical structure, with one end configured as an air inlet and the other end configured as an ignition end. The air inlet is located on the outside of the melting furnace body and is equipped with a primary air inlet; the ignition end is inserted into the side wall of the melting furnace body. The Brown gas duct is movably inserted into the inner cavity of the burner sleeve, with one end extending out of the air inlet of the burner sleeve and equipped with a gas interface; the other end is located in the center of the inner cavity of the ignition end of the burner sleeve and is equipped with a burner nozzle. The gas interface is connected to the Brown gas generator via a gas supply pipeline; the primary air interface is connected to the primary air supply device. The burner nozzle has a truncated cone structure with milled holes evenly distributed around its outer circumference, and an ignition gun is installed at the top of the truncated cone.

[0006] Its further features are: It also includes: a flue, which is located at the top of the furnace body at one end of the feeding system, at the highest point of the arch, and vertically upward; The flue includes a secondary combustion section and a heat recovery section arranged from bottom to top; the heat recovery section includes an air-cooling section and a water-cooling section arranged from bottom to top. A secondary air inlet is provided on the inner wall of the secondary combustion section, and the secondary air inlet is connected to a combustion air supply device. It also includes: heat exchange equipment, which includes: gas-to-gas heat exchange equipment and gas-liquid heat exchange equipment, wherein the gas-to-gas heat exchange equipment is installed in the air-cooled section and the gas-liquid heat exchange equipment is installed in the water-cooled section; The cold end inlet of the gas-to-gas heat exchanger is connected to the air supply equipment, and the hot end outlet is connected to the primary air interface. The cold end inlet of the gas-liquid heat exchanger is connected to the demineralized water supply equipment, and the hot end outlet is connected to the Brown gas generator. The furnace wall structure of the melting furnace body includes: a zirconium oxide layer, a nano-aerogel layer and a copper water jacket arranged from the inside to the outside; The height of the molten pool in the inner cavity of the furnace body is no higher than half the height of the inner cavity of the furnace body, and the discharge port is located below the highest point of the molten pool; the feeding position of the feeding system is higher than the height of the molten pool. The Brown gas burner further includes: a baffle structure, the baffle structure including baffle blades, the baffle blades being installed on the outer periphery of the Brown gas duct; the air inlet side of the baffle blades facing the primary air inlet direction, and the air outlet direction being set on the outer periphery of the burner nozzle; It also includes: a telescopic structure, which is implemented based on a linear drive module; the telescopic structure is fixed to the outside of the melting furnace body; the output end of the telescopic structure is connected to the Brown gas duct; It also includes: a burner protective cover, which is installed in the side wall of the melting furnace body. The burner protective cover is a lampshade-shaped structure that is narrow at one end and wide at the other, with the wider end facing the inner cavity of the melting furnace body. The ignition end of the burner sleeve is inserted into the inner cavity on the narrower side of the burner protective cover.

[0007] This application provides a molten furnace system based on ultra-high temperature combustion of Brown gas. Brown gas is introduced as high-temperature fuel by uniformly arranging Brown gas burners on the inner wall of the furnace cavity. A gas storage tank is installed between the Brown gas burners and the Brown gas generator to ensure a stable gas supply to the burners, thereby ensuring stable internal temperature of the furnace. A flame arrester is installed between the burners and the storage tank to eliminate the risk of backfire. A porous burner nozzle is installed in the burner to guide Brown gas through a Brown gas conduit to the nozzle for uniform combustion. The Brown gas conduit and burner nozzle are located within the burner sleeve cavity. Primary air is introduced into the burner sleeve cavity in the same direction as the Brown gas flow through a primary air interface, mixing with the Brown gas at the burner nozzle and then combusting before being sprayed into the furnace cavity through a burner protective cover. This reduces the risk of Brown gas backfire, ensures stable burner operation, and improves the safety of the furnace operation. The top of the molten furnace is designed as an arched dome. The space created by the arched dome helps guide the flow of the high-temperature gas stream composed of flames and flue gas within the furnace, promoting a uniform distribution of the high-temperature gas stream in the furnace space. This improves the temperature uniformity, heating efficiency, and fuel utilization rate within the furnace. Furthermore, when the internal high-temperature molten pool generates significant gas pressure, the force on the arched dome is converted into a force along the tangent of the arch, which is transmitted to adjacent parts and ultimately to the arch feet on both sides. This mechanical principle prevents the gaps between the arched structures from easily opening, reducing the probability of gas leakage and effectively improving equipment safety. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the overall structure of the melting furnace system in this application; Figure 2 A schematic diagram of a Brownian gas burner; Figure 3 for Figure 2 A magnified structural diagram of point A in the middle. Detailed Implementation

[0009] like Figure 1 As shown, this application includes: a melting furnace system based on ultra-high temperature combustion of Brown gas, which includes: a melting furnace body 1, a feeding system 2, a Brown gas burner 3, a furnace tail water quenched slag conveying system 4, and a flue 8.

[0010] The melting furnace body 1 is a cubic structure with a rectangular cross-section. In this embodiment, the length, width and height of the melting furnace body 1 are 9600cm, 4100cm and 3800cm respectively. The top is set as an arched top, and the inner surface of the arched top is a downward curved surface, which effectively reflects the radiant heat emitted by the flame and high temperature furnace wall in the furnace back to the lower part of the furnace chamber and focuses it on the heated material.

[0011] The internal cavity of the furnace body 1 is a high-temperature molten pool area. The height of the molten pool 9 in the inner cavity of the furnace body 1 is no higher than half the height of the inner cavity of the furnace body 1, and the discharge port 104 is located below the highest point of the molten pool 9. The feeding position of the feeding system 2 is higher than the height of the molten pool 9. The flue 8 is located at the top of the furnace body at one end of the feeding system 2, at the highest point of the arch, and is set vertically upward. The combustion flue gas is sent out of the furnace through the flue 8.

[0012] The furnace wall structure of the melting furnace body 1 includes: a high-temperature resistant layer 101, a heat insulation layer 102, and a cooling support layer 103 arranged from the inside to the outside; in this embodiment, the high-temperature resistant layer 101 is based on a zirconium oxide layer, the heat insulation layer 102 is based on a nano aerogel layer, and the cooling support layer 103 is based on a copper water jacket.

[0013] This application includes a high-temperature water-cooled screw conveyor system 22 and a material buffer silo 21 on each side of the melting furnace as the feeding system 2. After granulation and uniform mixing, fly ash enters the material buffer silo 21 and is uniformly fed into the high-temperature melting furnace via the high-temperature water-cooled screw conveyor. Inside the melting furnace, the fly ash and other auxiliary materials are melted into a liquid state. Simultaneously, organic matter, dioxins, furans, and other substances in the fly ash are fully combusted and decomposed, thereby removing toxic and harmful substances such as organic matter from the fly ash. The feeding system 2 includes the feeding buffer silo 21 and the high-temperature water screw conveyor 22. Pre-treated (dried and granulated) fly ash and auxiliary materials (silica sand) are mixed and fed to the feeding buffer silo 21. The mixed material is uniformly conveyed from the buffer silo outlet to the melting furnace via the high-temperature water-cooled screw conveyor 22. The high-temperature water-cooled screw conveyor uses high-temperature resistant materials and water-cooling protection measures, thereby extending the service life of the high-temperature water-cooled screw conveyor and improving the stability of the equipment. The fly ash and auxiliary materials are fully combusted and melted in the melting pool zone 9 of the melting furnace.

[0014] The bottom plate of the melting furnace body 1 is designed as an inclined surface with one end higher than the other along its length. The feeding system 2 is located at the higher end of the bottom plate and is arranged on both sides of the melting furnace body 1 in the width direction. The discharge port 104 is located at the lower end of the bottom plate, and the furnace tail water-quenched slag conveying system 4 is connected to the discharge port 104. Specifically, two slag discharge ports 104 are provided at the tail of the melting furnace. The high-temperature molten slag slides through the chute 43 to the slag cooler 41, which is a water-cooled slag remover. Inside the slag cooler 41, the high-temperature molten slag is water-quenched into a glassy state. The glassy product has stable properties and low heavy metal leaching. The finished glassy product is sent to the glassy storage device 42 by the slag cooler. The glassy storage device 42 is based on a slag storage bin or a ton container.

[0015] Because the bottom plate of the furnace body 1 is designed as an inclined surface with one end higher than the other along its length, the material fed into the furnace by the feeding system 2 from the higher end will flow down the bottom plate to the lower end after being fully burned and melted in the molten pool zone 9 of the furnace. Even if there is any material that is not fully melted, it will be ignited by the Brown gas burners 3 on both sides along the way and fully melted. The slag outlet 104 is set at the lower end. The inorganic components melt to a liquid state at high temperature and are discharged from the furnace outlet 104 as high-temperature slag. Then, it is sent to the water-cooled slag remover 41 through the chute 43. The molten fly ash is rapidly cooled in the water-cooled slag remover and becomes glassy. Due to its dense structure, the heavy metals are bound and solidified in the glass and are difficult to leach out.

[0016] This application includes multiple Brown gas burners 3 on both sides of the melting furnace, using high-calorific-value Brown gas as fuel to provide sufficient heat to the melting furnace, with a theoretical maximum temperature of 2800 degrees Celsius. The inorganic components in the fly ash are melted into a glassy state. Due to the dense structure of the glass, heavy metals are bound and solidified, making them difficult to leach.

[0017] Brown gas burners 3 are evenly arranged on the side walls of the melting furnace body 1 on both sides in the width direction and connected to the Brown gas generating device 5; a gas storage tank 6 is provided between the Brown gas generating device 5 and the Brown gas burners 3; a flame arrester 7 is provided on the gas supply pipe between each Brown gas burner 3 and the gas storage tank 6.

[0018] like Figure 2 As shown, the Brown gas burner 3 includes: a burner sleeve 31, a Brown gas duct 33, and a burner nozzle 36.

[0019] The burner sleeve 31 has a cylindrical structure, with one end set as the air inlet and the other end set as the ignition end. The air inlet is located on the outside of the melting furnace body 1 and is provided with a primary air interface 32; the ignition end is inserted into the side wall of the melting furnace body 1.

[0020] A Brown gas duct 33 is movably inserted into the inner cavity of the burner sleeve 31. One end of the Brown gas duct 33 extends out of the air inlet of the burner sleeve 31 and is provided with a gas interface 34; the other end is located in the center of the ignition end cavity of the burner sleeve 31 and is provided with a burner nozzle 36; the gas interface 34 is connected to the Brown gas generator through a gas supply pipe; the primary air interface 32 is connected to the primary air supply device; the burner nozzle 36 has a truncated cone structure, with milled holes evenly distributed on the outer circumference of the burner nozzle 36, and an ignition gun 38 is provided at the top of the truncated cone. The ignition gun 38 is implemented using a high-energy electric ignition gun in the prior art.

[0021] When Brown gas enters through Brown gas duct 33, it is ejected through milled holes evenly distributed on burner nozzle 36. Simultaneously, primary air enters the inner cavity of burner sleeve 31 through primary air inlet 32 ​​and is blown from the outside of Brown gas duct 33 toward burner nozzle 36. At burner nozzle 36, it mixes with Brown gas and is ignited by ignition gun 38. Following the airflow of the primary air and Brown gas, it is then sprayed into the inner cavity of the melting furnace body 1. Both primary air and Brown gas are driven by booster fans to reduce the probability of backfire.

[0022] To ensure uniform mixing of primary air and Brownian air, this application also includes a spoiler structure 37, such as... Figure 3 As shown, the spoiler structure 37 includes spoiler blades 371, which are mounted on the outer periphery of the Brown gas duct 33 via a mounting bracket 372. The air inlet side of the spoiler blades 371 faces the primary air inlet, and the air outlet direction is set on the outer periphery of the burner nozzle 36. The spoiler blades 371 are a structure capable of achieving a turbulence effect in the prior art; in this embodiment, they are based on a spiral-shaped blade. The spoiler blades 371 are uniformly arranged on the Brown gas duct 33 adjacent to the outer periphery of the burner nozzle 36. Primary air blown in from the air inlet end enters through the air inlet end of the spoiler structure 37, and after being turbulent by the spoiler blades 371, it mixes uniformly with the Brown gas ejected from the burner nozzle 36 at the air outlet end, ensuring complete and stable combustion.

[0023] To ensure that the furnace body 1 remains undeformed at high temperatures, a burner protection cover 39 is provided in this application. The burner protection cover 39 is made of a high-temperature resistant metal material based on existing technology, such as 310S stainless steel plate. The burner protection cover 39 is installed in the side wall of the furnace body 1, and a high-temperature resistant casting material 391 is filled between the burner protection cover 39 and the furnace body 1 to further ensure safe use. The burner protection cover 39 has a lampshade-shaped structure that is narrow at one end and wide at the other, with the wider end facing the inner cavity of the furnace body 1. The ignition end of the burner sleeve 31 is inserted into the inner cavity of the narrower side of the burner protection cover 39.

[0024] To ensure safe use and convenient maintenance, this application also includes a telescopic structure 35, which is implemented based on a linear drive module in the prior art; in this embodiment, it is implemented based on a cylinder. The telescopic structure 35 is fixed to the outside of the melting furnace body 1, and the output end of the telescopic structure 35 is connected to a Brownian gas duct 33.

[0025] Specifically, refer to Figure 2 The air inlet end of the burner sleeve 31 is provided with a flange face 310, and a through hole is provided on the flange face 310. One end of the burner nozzle 36 of the Brown gas duct 33 is inserted into the inner cavity of the burner sleeve 31, and one end of the gas interface 34 is located on the outside of the flange face 310. The cylinder output end is connected to the end of the Brown gas duct 33 located on the flange face 310.

[0026] In case of safety issues or maintenance requirements, after confirming that the supply of Brown gas and primary air has been disconnected, activate the cylinder to pull the Brown gas duct 33, burner nozzle 36, and baffle structure 37 outward together. After the burner nozzle 36 of the Brown gas duct 33 has been completely pulled out of the furnace body 1, remove the flange face 310, then remove the Brown gas duct 33 for subsequent operations.

[0027] Multiple Brown gas burners 3 are installed on both sides of the melting furnace. Each burner has a built-in perforated ceramic nozzle. A flame arrester 7 is installed in the inlet gas pipe of each Brown gas burner 3 to eliminate the risk of backfire. High-calorific-value gas is used to provide sufficient heat to the melting furnace, with the internal molten pool reaching a maximum temperature of 2500 degrees Celsius. At this high temperature, the organic matter in the fly ash is decomposed, fully combusted, and melted, and toxic substances such as dioxins and furans are completely decomposed (decomposition rate > 99.99%).

[0028] According to the technical performance indicators (Table 1) of GB 18484-2020 "Standard for Pollution Control of Hazardous Waste Incineration", the incinerator's high-temperature calcination temperature should be ≥1100℃, flue gas residence time ≥2s, and incineration removal rate ≥99.99%. In this application, a section of rising flue gas is reserved outside the exhaust gas outlet at the top of the melting furnace as a secondary combustion section 81. This ensures sufficient residence time for the flue gas while meeting the required flue gas temperature, thus achieving the required hazardous waste incineration removal rate. Actual measurements show that when the molten pool temperature reaches 2300~2500℃, the temperature of the secondary combustion section 81 in flue gas 8 can reach 1100~1300℃. Even if some fly ash is carried into the secondary combustion section 81 by the exhaust gas, it can be re-burned after the introduction of combustion air. Even if a small amount of escaped material is completely burned off in the subsequent rising flue gas, meeting national standards. The specific height of the secondary combustion section 81 is adaptively set according to the diameter of the flue 8 and the rising speed of the exhaust gas, ensuring that the exhaust gas stays in the secondary combustion section 81 for ≥2 seconds.

[0029] Since the exhaust gas temperature at the outlet 86 of flue 8 greatly exceeds 1100℃, direct discharge would result in significant heat waste. Furthermore, the Brown gas burner 3 requires not only fuel gas but also a certain amount of combustion air (primary combustion air). Normally, this combustion air is ambient air. This application utilizes the waste heat in flue 8 to heat the primary combustion air, fully leveraging the waste heat of the exhaust gas, thus saving substantial energy consumption and reducing system operating costs. An air-cooled section 82 is installed in the middle of the rising flue to raise the temperature of the primary combustion air supplied by the primary air fan 85 to above 200℃. Additionally, a water-cooled section 83 is installed at the tail end of the rising flue 8 to heat the demineralized water required by the Brown gas generator 5 to approximately 90℃ before supplying it to the Brown gas generator, significantly reducing the electrical energy required by the Brown gas generator. In summary, by fully utilizing the waste heat generated by Brown gas combustion, the entire system can achieve energy savings of approximately 30%.

[0030] Specifically, the flue 8 includes a secondary combustion section 81 and a heat recovery section arranged from bottom to top; the heat recovery section includes an air-cooling section 82 and a water-cooling section 83 arranged from bottom to top; a secondary air inlet 84 is provided on the inner wall of the secondary combustion section 81, and the secondary air inlet 84 is connected to a combustion air supply device. The secondary air contains oxygen and provides combustion air for the secondary combustion of flue gas in the secondary combustion section 81. The specific air volume of the secondary air is adjusted by a PID regulating valve 87 based on the oxygen content in the exhaust gas to ensure the complete combustion and decomposition of dioxins in the exhaust gas. To achieve heat recovery, this application also includes heat exchange equipment in conjunction with the heat recovery section to form a waste heat recovery system. The heat exchange equipment includes gas-to-gas heat exchange equipment and gas-to-liquid heat exchange equipment. Both the gas-to-gas and gas-to-liquid heat exchange equipment in this application are based on tubular heat exchange equipment, specifically based on existing technology. In this embodiment, the gas-to-gas heat exchange equipment is based on finned tubes, and the gas-to-liquid heat exchange equipment is based on coils.

[0031] The gas-to-gas heat exchanger is installed inside the air-cooled section 82, where high-temperature exhaust gas exchanges heat with the air inside the finned tubes as it passes through them. The coils of the gas-liquid heat exchanger are arranged around the outer wall of the water-cooled section 83, where high-temperature flue gas exchanges heat with the demineralized water inside the tubes as it passes through them. The cold-end inlet of the gas-to-gas heat exchanger is connected to the air supply equipment, and the hot-end outlet is connected to the primary air interface. The cold-end inlet of the gas-liquid heat exchanger is connected to the demineralized water supply equipment, and the hot-end outlet is connected to the Brown gas generator 5.

[0032] The exhaust gas discharged from outlet 86 of flue 8 continues to be sent to the subsequent exhaust gas treatment system (not marked in the figure) for harmless treatment of the exhaust gas. The specific exhaust gas treatment system can be implemented based on existing technology.

[0033] In practical applications, the equipment described in this application can also be equipped with a melting furnace control system. Through online monitoring instruments, the injected fuel gas volume, demineralized water volume, and primary air volume can be adjusted to control the internal temperature of the melting furnace, i.e., the molten pool temperature. This not only allows for reasonable control of the reaction temperature of the molten pool but also ensures the temperature at the outlet of the rising flue. This guarantees that the temperature meets national standards, prevents excessively high temperatures and fuel gas waste, and avoids the risk of coking on the inner walls of the melting furnace and secondary combustion chamber.

[0034] By using the technical solution of this utility model, Brown gas can be safely used as fuel for the melting furnace, enabling fly ash to be melted and vitrified at high temperatures. During the high-temperature melting process, dioxins and furans undergo pyrolysis and combustion at high temperatures, and inorganic substances decompose and melt, then become vitrified after cooling. Heavy metals are completely solidified and bound within the vitrified body. Furthermore, the vitrified body has certain economic value, thereby achieving the stabilization, reduction, and resource utilization of fly ash.

Claims

1. A melting furnace system based on ultra-high temperature combustion of Brown gas, comprising: The melting furnace body, feeding system, Brown gas burner and tail water-quenched slag conveying system are characterized in that: the melting furnace body is a cubic structure with a rectangular cross-section and an arched top; The furnace wall structure of the melting furnace body includes: a high-temperature resistant layer, a heat insulation layer, and a cooling support layer arranged from the inside out; The bottom plate of the melting furnace body is set as an inclined surface with one end higher than the other along the length direction. The feeding system is set at the higher end of the bottom plate and is arranged on both sides of the width direction of the melting furnace body. The discharge port is set at the lower end of the bottom plate, and the furnace tail water quenched slag conveying system is connected to the discharge port. The Brown gas burners are evenly arranged on the side walls of the melting furnace body on both sides in the width direction; A gas storage tank is provided between the Brown gas generator and the Brown gas burner; A flame arrester is installed on the gas supply line between each Brown gas burner and the gas storage tank; The Brown gas burner includes: a burner sleeve, a Brown gas duct, and a burner nozzle. The burner sleeve has a cylindrical structure, with one end configured as an air inlet and the other end configured as an ignition end. The air inlet is located on the outside of the melting furnace body and is equipped with a primary air inlet; the ignition end is inserted into the side wall of the melting furnace body. The Brown gas duct is movably inserted into the inner cavity of the burner sleeve, with one end extending out of the air inlet of the burner sleeve and equipped with a gas interface; the other end is located in the center of the inner cavity of the ignition end of the burner sleeve and is equipped with a burner nozzle. The gas interface is connected to the Brown gas generator via a gas supply pipeline; the primary air interface is connected to the primary air supply device. The burner nozzle has a truncated cone structure with milled holes evenly distributed around its outer circumference, and an ignition gun is installed at the top of the truncated cone.

2. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 1, characterized in that: It also includes: a flue, which is located at the top of the furnace body at one end of the feeding system, at the highest point of the arch, and vertically upward; The flue includes a secondary combustion section and a heat recovery section arranged from bottom to top; the heat recovery section includes an air-cooling section and a water-cooling section arranged from bottom to top. A secondary air inlet is provided on the inner wall of the secondary combustion section, and the secondary air inlet is connected to a combustion air supply device.

3. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 2, characterized in that: It also includes: heat exchange equipment, which includes: gas-to-gas heat exchange equipment and gas-liquid heat exchange equipment, wherein the gas-to-gas heat exchange equipment is installed in the air-cooled section and the gas-liquid heat exchange equipment is installed in the water-cooled section; The cold end inlet of the gas-to-gas heat exchanger is connected to the air supply equipment, and the hot end outlet is connected to the primary air interface. The cold end inlet of the gas-liquid heat exchanger is connected to the demineralized water supply equipment, and the hot end outlet is connected to the Brown gas generator.

4. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 1, characterized in that: The furnace wall structure of the melting furnace body includes: a zirconium oxide layer, a nano-aerogel layer, and a copper water jacket arranged from the inside out.

5. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 1, characterized in that: The height of the molten pool in the inner cavity of the furnace body is no higher than half the height of the inner cavity of the furnace body, and the outlet position is lower than the highest point of the molten pool; the feeding position of the feeding system is higher than the height of the molten pool.

6. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 1, characterized in that: The Brown gas burner further includes a baffle structure, which includes baffle blades installed on the outer periphery of the Brown gas duct; the air inlet side of the baffle blades faces the primary air inlet, and the air outlet direction is set on the outer periphery of the burner nozzle.

7. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 6, characterized in that: It also includes: a telescopic structure, which is implemented based on a linear drive module; the telescopic structure is fixed to the outside of the melting furnace body; the output end of the telescopic structure is connected to the Brown gas duct.

8. The melting furnace system based on ultra-high temperature combustion of Brown gas according to claim 6, characterized in that: It also includes: a burner protective cover, which is installed in the side wall of the melting furnace body. The burner protective cover is a lampshade-shaped structure that is narrow at one end and wide at the other, with the wider end facing the inner cavity of the melting furnace body. The ignition end of the burner sleeve is inserted into the inner cavity on the narrower side of the burner protective cover.

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