Reduction furnace hearth temperature optimization device and method

Abstract

The invention discloses a reduction furnace hearth temperature optimizing device and method, and relates to the technical field of reduction furnaces, the device comprises a furnace body, a burner assembly and a medium supply assembly, the burner assembly and the medium supply assembly are installed on the furnace body, and a furnace top is installed at the top of the furnace body. In the medium supply assembly, a plurality of natural gas pipes are correspondingly connected with gas inlet pipes of the burner assemblies, the problem that pressure of burners at the tail end is insufficient due to traditional single-pipe multi-nozzle gas supply is thoroughly solved, uniform gas supply of the burners is achieved, and the combustion efficiency is improved. One end of the air pipe is connected with the air inlet pipe, the other end of the air pipe is connected with the air pump, the air pump can provide stable forced airflow, air supply is prevented from being affected by natural air pressure fluctuation, it is guaranteed that fuel and air are mixed according to the optimal proportion all the time, sufficient combustion is guaranteed, energy consumption is reduced, and meanwhile a foundation is laid for hearth temperature stability; and the problems of large hearth temperature fluctuation and low reduction reaction efficiency caused by non-uniform gas supply and unstable combustion of a traditional device are effectively improved.

Description

Technical Field

[0001] This invention relates to the field of reduction furnace technology, and in particular to a device and method for optimizing the furnace temperature of a reduction furnace. Background Technology

[0002] Reduction furnaces are key thermal equipment used in metallurgical, chemical, and other fields for the reduction reaction of metal oxides. Their core function is to provide a stable and uniform high-temperature environment in the furnace chamber through fuel combustion. A typical reduction furnace consists of a furnace body comprised of a top, bottom, and walls, and a combustion system and a fuel supply system arranged within the furnace body. The combustion system mainly consists of burner assemblies, which ignite a mixture of air and fuel (such as natural gas) supplied from the air inlet and fuel gas inlet pipes using an ignition gun, generating a high-temperature flame to heat the furnace chamber and the internal reduction vessel. The fuel supply system is responsible for stably delivering fuel and combustion air to each burner. In such equipment, the uniformity and stability of the furnace temperature are core technical indicators that directly affect the reduction reaction efficiency, energy consumption, and the quality of the final product (such as the purity of crude magnesium).

[0003] In existing solutions, the medium supply system typically employs a "single-pipe, multi-nozzle" gas supply mode, where a single main pipeline supplies gas to multiple burners simultaneously. This method easily leads to insufficient pressure at the end burners and uneven gas distribution among them. Simultaneously, air supply largely relies on natural wind pressure, which has poor pressure and flow stability, resulting in inadequate fuel-air mixing and low combustion efficiency. Regarding combustion control, existing methods generally depend on operators observing flame color and manually adjusting valve openings based on experience, lacking a real-time, accurate combustion status monitoring and feedback mechanism, making precise control of the combustion process difficult. These problems—uneven gas supply, insufficient mixing, and delayed manual control—combined to cause uneven temperature distribution within the furnace, localized overheating or underheating, and significant overall temperature fluctuations, directly impacting the overall efficiency of the reduction reaction and the consistency of product quality. Summary of the Invention

[0004] This invention provides a furnace temperature optimization device for a reduction furnace, which can solve the problem that the air supply in the prior art relies heavily on natural wind pressure, which has poor pressure and flow stability, resulting in unsatisfactory fuel-air mixing and low combustion efficiency.

[0005] A furnace temperature optimization device for a reduction furnace includes a furnace body and a burner assembly and a medium supply assembly mounted thereon. A furnace top is installed on the top of the furnace body, and a furnace bottom is installed at the bottom of the furnace body. The burner assembly is connected to a reduction tank. The burner assembly includes a housing and burner bricks. An air inlet pipe and a gas inlet pipe are installed on the housing, and an ignition gun is installed on the burner bricks. The medium supply assembly includes an air pipe and multiple natural gas pipes. One end of the air pipe is connected to the air inlet pipe, and the other end of the air pipe is connected to an air pump. One end of the natural gas pipe is connected to the gas inlet pipe.

[0006] The present invention provides a furnace temperature optimization device for a reduction furnace, which, compared with the prior art, has, but is not limited to, the following beneficial effects: This reduction furnace temperature optimization device provides a closed space for mixing air and natural gas through the burner assembly housing. The air inlet pipe and the fuel inlet pipe respectively deliver combustion air and fuel. Their reasonable layout promotes initial gas mixing. The burner brick guides the mixed gas to form a stable flame, and the ignition gun can quickly ignite the gas, ensuring timely combustion start-up. In the medium supply component, multiple natural gas pipes are connected to the fuel inlet pipes of each burner assembly, completely solving the problem of insufficient pressure at the end burners caused by traditional single-pipe multi-nozzle gas supply. This achieves uniform gas supply to each burner. One end of the air pipe is connected to the air inlet pipe, and the other end is connected to the air pump. The air pump can provide a stable forced airflow, avoiding the impact of natural wind pressure fluctuations on the air supply. This ensures that fuel and air are always mixed in the optimal ratio, thereby ensuring complete combustion, reducing energy consumption, and laying the foundation for stable furnace temperature. This effectively improves the problems of uneven gas supply, unstable combustion, large furnace temperature fluctuations, and low reduction reaction efficiency caused by traditional devices.

[0007] Furthermore, a heat storage body is provided inside the box, and an elongated hole is provided on the burner brick.

[0008] Furthermore, a dust removal hood is installed on the top of the furnace, and a heightening frame is installed at the bottom of the furnace.

[0009] Furthermore, an upper water-cooling pipe is installed on the furnace top, and a lower water-cooling pipe is installed on the furnace bottom. The upper and lower water-cooling pipes are connected by a circulating water pipe, which is connected to an inlet pipe and an outlet pipe.

[0010] Furthermore, multiple natural gas pipes are provided, and each of the gas inlet pipes is connected to a natural gas pipe, and a solenoid valve and a ball valve are installed on the natural gas pipe.

[0011] Furthermore, the enclosure is equipped with an inspection door panel.

[0012] Furthermore, the device also includes an electrical control subsystem, which includes multiple temperature sensors disposed on the inner wall of the furnace body, the temperature sensors being located on one side of the burner assembly.

[0013] Furthermore, the heat storage body is made of honeycomb ceramic material.

[0014] Furthermore, an air duct gate valve is also installed on the furnace top.

[0015] A method for optimizing the furnace temperature of a reduction furnace includes: S1: Start the air pump to deliver air to the burner assembly housing through the air pipe and the air inlet pipe, and at the same time, deliver natural gas to the housing through the natural gas pipe and the gas inlet pipe; S2: Inside the chamber, the incoming air is mixed with natural gas, and the mixed gas is ignited by an ignition gun to form a flame at the burner brick, which heats the reduction tank. S3: Monitor the temperature inside the furnace chamber in real time, compare the monitored temperature signal with the preset target temperature value, and adjust the valve opening on the natural gas pipe and / or the power of the gas pump in real time according to the comparison result to change the supply flow of natural gas and air, thereby stabilizing the furnace temperature near the target temperature value. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a reduction furnace temperature optimization device according to an embodiment of the present invention; Figure 2 for Figure 1 Schematic diagram of the structure of the furnace top; Figure 3 for Figure 1 Schematic diagram of the burner assembly Figure 1 ; Figure 4 for Figure 1 Schematic diagram of the burner assembly Figure 2 ; Figure 5 for Figure 1 Internal schematic diagram of the burner assembly; Figure 6 for Figure 1 A schematic diagram of the medium supply component.

[0017] Explanation of reference numerals in the attached figures: 1. Furnace body; 2. Furnace top; 3. Furnace bottom; 4. Burner assembly; 5. Medium supply assembly; 6. Reduction tank; 7. Dust hood; 8. Elevator frame; 9. Upper water cooling pipes; 10. Lower water cooling pipes; 11. Circulating water pipe; 12. Inlet water pipe; 13. Outlet water pipe; 14. Temperature sensor; 15. Air duct gate valve; 41. Housing; 42. Burner brick; 43. Air inlet pipe; 44. Gas inlet pipe; 45. Ignition gun; 46. Heat storage body; 47. Long waist hole; 48. Inspection door panel; 51. Air pipe; 52. Natural gas pipe; 53. Air pump; 54. Solenoid valve; 55. Ball valve. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings showing multiple embodiments according to this application. It should be understood that the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments described in this application without creative effort will fall within the scope of protection of this application.

[0019] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing specific embodiments only and is not intended to limit this application; the terms "comprising," "including," "having," "containing," etc., in the description, claims, and accompanying drawings of this application are open-ended terms. Therefore, "comprising," "including," or "having" refers to, for example, a method or apparatus having one or more steps or elements, but is not limited to having only these one or more elements. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0021] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0022] It should be emphasized that when the term "comprising / including" is used in this specification, it is used to explicitly indicate the presence of the stated feature, integer, step, or component, but does not exclude the presence or addition of one or more other features, integers, steps, parts, or groups of features, integers, steps, or parts.

[0023] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0024] like Figure 1-3 As shown in the figure, an embodiment of the present invention provides a furnace temperature optimization device for a reduction furnace, including a furnace body 1 and a burner assembly 4 and a medium supply assembly 5 installed thereon. A furnace top 2 is installed on the top of the furnace body 1, and a furnace bottom 3 is installed on the bottom of the furnace body 1. The burner assembly 4 is connected to a reduction tank 6. The burner assembly 4 includes a housing 41 and burner bricks 42. An air inlet pipe 43 and a gas inlet pipe 44 are installed on the housing 41, and an ignition gun 45 is installed on the burner bricks 42. The medium supply assembly 5 includes an air pipe 51 and multiple natural gas pipes 52. One end of the air pipe 51 is connected to the air inlet pipe 43, and the other end of the air pipe 51 is connected to an air pump 53. One end of the natural gas pipes 52 is connected to the gas inlet pipes 44.

[0025] In this embodiment, the furnace body 1 serves as the basic frame, with the furnace top 2 and furnace bottom 3 forming a stable high-temperature reaction space, providing a suitable heating environment for the reduction tank 6. The burner assembly 4 is directly connected to the reduction tank 6, ensuring that the flame heat is precisely applied to the reduction tank 6, avoiding heat waste. The housing 41 of the burner assembly 4 provides a closed space for the mixing of air and natural gas. The air inlet pipe 43 and the gas inlet pipe 44 respectively deliver combustion air and fuel. Their reasonable arrangement promotes initial gas mixing. The burner brick 42 guides the mixed gas to form a stable flame, and the ignition gun 45 can quickly ignite the gas, ensuring timely combustion start-up. In the supply component 5, multiple natural gas pipes 52 are connected to the gas inlet pipes 44 of each burner component 4, which completely solves the problem of insufficient pressure at the end burners caused by traditional single-pipe multi-burner gas supply, and realizes uniform gas supply to each burner. The air pipe 51 is connected to the air inlet pipe 43 at one end and the air pump 53 at the other end. The air pump 53 can provide a stable forced airflow, avoid the natural wind pressure fluctuations from affecting the air supply, ensure that the fuel and air are always mixed in the optimal ratio, thereby ensuring complete combustion, reducing energy consumption, and laying the foundation for stable furnace temperature. It effectively improves the problems of uneven gas supply and unstable combustion in traditional devices, which lead to large furnace temperature fluctuations and low reduction reaction efficiency.

[0026] Specifically, the ignition end of the ignition gun 45 is located inside the housing 41. The ignition gun 45 adopts an integrated structure of high-temperature resistant electrodes, insulation protection, and high-voltage drive. The core consists of two coaxially arranged electrodes, with an inner polytetrafluoroethylene insulating tube and an outer high-alumina ceramic insulating tube. High-temperature resistant sealant is filled between the tube and the ignition hole of the burner brick 42. The tail is connected to the high-voltage ignition module of the electrical control subsystem and integrates a signal feedback line through an AF200 high-temperature resistant cable. It is positioned with the burner brick 42 through the ignition hole and is precisely aligned with the downstream mixing area where the air inlet pipe 43 and the gas inlet pipe 44 meet inside the housing 41. It works in conjunction with the medium supply component 5, following the principle of supplying gas first and then igniting. It works with the temperature sensor 14 to determine the success or failure of ignition. During ignition, the high-voltage module converts AC power to high-voltage power, and an electric spark is generated between the electrodes, igniting the mixed gas to the ignition temperature. The flame forms a swirling heating reduction tank 6 through the long waist hole 47 of the burner brick 42. After successful ignition, the high-voltage power supply is stopped.

[0027] Among them, the elongated hole 47 on the burner brick 42 serves as a precise fluid channel, which can effectively organize the mixed airflow of gas and air, and make it spray out in a predetermined shape. At the same time, the high refractory material used in the burner brick rapidly stores heat and heats up after ignition. Its hot inner surface serves as a continuous ignition source, which can instantly ignite the mixed gas flowing through it, effectively preventing flame extinguishing or backfire caused by changes in airflow speed.

[0028] like Figure 4 and Figure 5As shown, a heat storage body 46 is installed inside the box 41, and an elongated hole 47 is opened on the burner brick 42.

[0029] In this embodiment, efficient waste heat recovery is achieved through the heat storage body 46 housed inside the box 41. The heat storage body 46 can maximize contact with the high-temperature flue gas generated after combustion, storing the waste heat in the flue gas and transferring it to the cold air entering the box 41 subsequently. By stabilizing the preheated air temperature, unstable fuel combustion heat output caused by air temperature fluctuations is avoided. At the same time, the elongated holes 47 opened on the burner brick 42, after being optimized by fluid mechanics, can guide the fully mixed gas in the box 41 to form a swirling pattern and be ejected. This increases the contact area between the flame and the reduction tank 6, ensuring that heat is evenly transferred to the reduction tank and avoiding local overheating of the reduction tank caused by local flame concentration. It can also prolong the combustion time of the gas in the furnace through the swirling effect, promoting complete combustion of fuel and reducing the waste of unburned gas and pollutant emissions. Ultimately, it achieves the synergistic effect of waste heat recovery, efficient combustion and uniform heat transfer, providing key support for stabilizing the furnace temperature at 680-720℃ and controlling the temperature difference within ±3℃.

[0030] Specifically, the heat storage body 46 is made of honeycomb ceramic material with a temperature resistance of ≥1600℃. The honeycomb structure with a porosity of ≥80% can maximize the contact with the high-temperature flue gas generated after combustion, store the waste heat in the flue gas (recovery efficiency ≥85%) and transfer it to the cold air that subsequently enters the housing 41, so that the preheated air temperature is increased from <200℃ in the existing technology to more than 300℃, reducing natural gas consumption (10%-15% lower than the traditional solution).

[0031] like Figure 1 and Figure 2 As shown, a dust removal hood 7 is installed on the furnace top 2, and a heightening frame 8 is installed on the furnace bottom 3.

[0032] In this embodiment, the furnace top 2 serves as a closed and protective structure for the upper part of the furnace. The dust hood 7 installed on it guides the high-temperature hot airflow in the furnace to be discharged in an orderly manner, avoiding the accumulation of hot airflow caused by the lack of a dedicated flue gas exhaust structure in traditional furnace tops. During the combustion process in the furnace, flue gas containing residual heat is generated. If it cannot be discharged in time, it can easily cause the local temperature in the furnace top area to exceed 750°C, forming an excessive temperature difference (exceeding ±10°C) with the lower part of the furnace. The dust hood 7, through reasonable diameter design and distribution, can ensure that the hot airflow is discharged evenly, reducing the temperature difference between the upper and lower parts of the furnace to within ±3°C, ensuring that the reduction tank 6 is heated evenly. At the same time, it simultaneously filters dust impurities in the flue gas, preventing dust from adhering to the inner wall of the furnace top 2 or falling back into the furnace. This reduces the aging rate of the furnace top refractory material caused by dust erosion, extends the service life of the furnace top 2, and prevents dust from affecting the purity of fuel combustion, indirectly ensuring stable combustion efficiency.

[0033] The furnace bottom 3 serves as the foundation for the furnace body's bottom support. The riser 8 installed on it raises the furnace bottom 3 above the ground, preventing moisture or debris from directly contacting the furnace bottom. When the traditional furnace bottom is directly on the ground, moisture can easily penetrate the refractory material, causing it to become damp and crack, resulting in a heat leakage rate exceeding 15%. The elevated space created by the riser 8 can block moisture erosion and facilitate the cleaning of debris around the furnace bottom, reducing the risk of equipment failure caused by debris accumulation. At the same time, it provides maintenance space for the pipes below the furnace bottom 3. When the traditional furnace bottom does not have a riser design, workers need to bend over or lie on the ground to inspect the pipes, which is difficult and prone to damaging the pipes. The riser 8 provides a height space of about 500mm, allowing maintenance personnel to operate upright, improving pipe maintenance efficiency by more than 40%, while avoiding collisions and interference with the furnace bottom 3 and the internal reduction tank 6 during maintenance, ensuring the overall operational stability of the furnace body.

[0034] like Figure 1 As shown, an upper water-cooling pipe 9 is installed on the furnace top 2, and a lower water-cooling pipe 10 is installed on the furnace bottom 3. The upper water-cooling pipe 9 and the lower water-cooling pipe 10 are connected by a circulating water pipe 11, which is connected to the inlet pipe 12 and the outlet pipe 13.

[0035] In this embodiment, the upper water-cooling pipe 9 installed on the furnace top 2 can directly act on the inner refractory material of the furnace top. The cooling water flowing inside the pipe absorbs the heat transferred from the furnace top, and the upper water-cooling pipe 9 can stably control the temperature of the inner wall of the furnace top within a reasonable range, avoiding accelerated damage to the refractory material due to local overheating and extending the overall service life of the furnace top 2. Similarly, the lower water-cooling pipe 10 on the furnace bottom 3 can cool the area where the furnace bottom 3 contacts the ground, preventing the refractory material at the furnace bottom from bulging and peeling due to long-term heating and poor heat dissipation, while also preventing high temperature from being transferred to the ground through the furnace bottom and causing safety issues. Potential hazards: The circulating water pipe 11, which connects the upper water-cooled pipe 9 and the lower water-cooled pipe 10, realizes a closed-loop circulation of cooling water: the inlet pipe 12 delivers low-temperature cooling water of ≤30℃ to the circulating water pipe 11. After absorbing heat through the upper and lower water-cooled pipes, the heated cooling water is discharged through the outlet pipe 13, forming a stable process of low-temperature water inlet, heat absorption and heating, and high-temperature water outlet. This avoids the waste of cooling water. At the same time, through the continuous heat exchange of the circulating water flow, it ensures that the cooling effect of the upper and lower water-cooled pipes is uniform and stable, and there will be no cooling dead zone due to local cooling water stagnation.

[0036] like Figure 1 and Figure 6 As shown, there are multiple natural gas pipes 52, and each gas inlet pipe 44 is connected to a natural gas pipe 52. A solenoid valve 54 and a ball valve 55 are installed on the natural gas pipe 52.

[0037] In this embodiment, multiple natural gas pipes 52 overcome the limitations of traditional single-pipe multi-nozzle gas supply, achieving precise allocation of gas to each burner via an independent gas pipe. Each natural gas pipe 52 can independently supply gas to the corresponding burner's gas inlet pipe 44, avoiding insufficient pressure at the end burners caused by pressure distribution in the main pipeline. This lays the foundation for uniform heat output from each burner, thereby reducing local temperature differences in the furnace. The solenoid valve 54 on the natural gas pipe 52 can receive feedback signals from the temperature sensor in real time. When the temperature in a certain area of ​​the furnace deviates from the target range of 680-720℃, it can precisely adjust the opening degree within 1 second, changing the temperature distribution. The gas supply to the burner enables dynamic temperature control, allowing for precise adjustments to be made wherever there is a temperature deviation. This reduces temperature fluctuations from the traditional ±5℃ or more to within ±1℃, avoiding the lag of more than 10 minutes required for manual adjustments. The ball valve 55 connected in series serves both functional regulation and safety assurance. It allows for manual adjustment of gas flow in case of a malfunction in the solenoid valve 54, ensuring uninterrupted production. It can also completely cut off the gas supply during maintenance or shutdown, preventing safety hazards caused by minor leaks. The dual-valve combination increases safety redundancy by more than 100%. Together, these three components form a stable, precise, and safe gas supply system.

[0038] like Figure 4 and Figure 5 As shown, the housing 41 is equipped with an inspection door 48.

[0039] In this embodiment, the inspection door 48 is connected to the housing 41 via a hinge and is equipped with a high-temperature resistant sealing gasket. The operator can quickly open the door without disassembling the entire burner assembly to directly inspect the ash accumulation and damage status of the heat storage body 46 inside the housing 41. Cleaning the ash accumulation only requires blowing with 0.4MPa compressed air for 10-15 minutes, and replacing a damaged heat storage body takes ≤30 minutes per unit. Compared with the traditional maintenance method of disassembling the housing 41 (which takes 2-3 hours), the efficiency is improved by more than 80%, while avoiding damage to the air inlet pipe 43 and the gas inlet pipe 44 connection seal during disassembly.

[0040] like Figure 1 and Figure 2 As shown, the device also includes an electrical control subsystem, which includes multiple temperature sensors 14 disposed on the inner wall of the furnace body 1, with the temperature sensors 14 located on one side of the burner assembly 4.

[0041] In this embodiment, multiple temperature sensors 14 can comprehensively cover all areas of the inner wall of the furnace body 1, avoiding the limitation of traditional single-point temperature measurement that cannot capture local temperature differences in the furnace. Especially because they are close to the burner assembly 4, they can sense the furnace temperature change corresponding to the burner's combustion heat output in real time. Compared with temperature measurement positions far from the burner, the temperature feedback lag time is shortened to ≤1s. At the same time, the temperature sensors 14 can collect temperature data of each area in real time and transmit it to the control system. When the temperature of a certain area deviates from the target range of 680-720℃ by more than ±2℃, the control system can quickly locate the problem. The gas flow is then precisely adjusted by the solenoid valve 54 on the natural gas pipe 52 of the corresponding burner assembly 4, thereby achieving a closed-loop linkage of "burner-temperature-control". This avoids the control delay of more than 10 minutes caused by traditional manual inspection, and keeps the overall temperature difference of the furnace within ±3℃ and the temperature fluctuation within ±1℃. This provides data assurance for the optimal mixing ratio of fuel and air and the uniform heating of the reduction tank 6. At the same time, it reduces fuel waste and product quality deviation caused by untimely temperature monitoring, and further improves the production efficiency and product qualification rate of the reduction furnace.

[0042] like Figure 1 and Figure 2 As shown, a duct gate valve 15 is also installed on the furnace top 2. The duct gate valve 15 can be manually or electrically adjusted to precisely control the discharge rate of hot air and flue gas in the furnace top 2 area. When hot air accumulates in a local area of ​​the furnace due to the difference in burner heat output, adjusting the opening of the corresponding area's duct gate valve 15 can quickly balance the airflow distribution in the furnace, avoiding the disordered hot air discharge problem caused by the traditional gateless design, and helping to further reduce the temperature difference between different areas of the furnace to within ±3℃. At the same time, the duct gate valve 15 can be used in conjunction with the dust hood 7. When the dust hood 7 needs to be cleaned or repaired, closing the duct gate valve 15 can temporarily block the airflow connection between the furnace and the outside, preventing a large amount of cold air from entering the furnace and causing a sudden drop in temperature, ensuring that the furnace temperature is basically stable during maintenance, and reducing the time and energy consumption for reheating after maintenance.

[0043] A method for optimizing the furnace temperature of a reduction furnace includes: S1: starting the air pump 53 to deliver air to the housing 41 of the burner assembly 4 through the air pipe 51 and the air inlet pipe 43, and simultaneously delivering natural gas to the housing 41 through the natural gas pipe 52 and the gas inlet pipe 44; S2: mixing the incoming air with the natural gas inside the housing 41, igniting the mixed gas with the ignition gun 45 to form a flame at the burner brick 42, and heating the reduction tank 6; S3: monitoring the temperature inside the furnace of the furnace body 1 in real time, comparing the monitored temperature signal with a preset target temperature value, and adjusting the valve opening on the natural gas pipe 52 and / or the power of the air pump 53 in real time according to the comparison result to change the supply flow rate of natural gas and air, thereby stabilizing the furnace temperature near the target temperature value.

[0044] In this embodiment, the start-up air pump 53 delivers stable-pressure air to the housing 41 of the burner assembly 4 via the air pipe 51 and the air inlet pipe 43. Simultaneously, natural gas is delivered to the housing 41 via the natural gas pipe 52 and the gas inlet pipe 44, avoiding the instability of traditional natural air supply and single-pipe gas supply, ensuring that the initial supply pressure of air and natural gas matches, laying the foundation for subsequent thorough mixing. The housing 41 provides a closed mixing space for air and natural gas. Combined with the elongated hole 47 of the burner brick 42, the mixed gas can form a swirling flame, increasing the contact area with the reduction tank 6. At the same time, the ignition gun 45 quickly ignites the gas, avoiding gas accumulation caused by ignition delay, and ensuring efficient heat transfer. The gas is transferred to the reduction tank 6 to reduce heat loss. The temperature is monitored in real time by the temperature sensor 14 on the inner wall of the furnace body 1. After comparing the signal with the target temperature, the opening of the solenoid valve 54 on the natural gas pipe 52 or the power of the gas pump 53 can be precisely adjusted to achieve a closed-loop linkage of "gas supply-temperature-adjustment". This avoids the lag of more than 10 minutes in traditional manual adjustment, controls the furnace temperature difference within ±3℃ and stabilizes the temperature fluctuation within ±1℃. At the same time, it ensures that the fuel and air are always mixed in the optimal ratio of 1:10-1:12, improves the combustion efficiency to ≥85%, and reduces natural gas consumption by 10%-15%. This provides a reliable guarantee for a stable reduction reaction and high-quality products in the reduction tank 6.

[0045] The above-disclosed embodiments are merely a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A reducing furnace hearth temperature optimization device, characterized by, The device comprises a furnace body (1), a burner assembly (4) and a medium supply assembly (5) installed on the furnace body (1), the furnace body (1) is provided with a furnace top (2) at the top and a furnace bottom (3) at the bottom, the burner assembly (4) is connected with a reduction tank (6); The burner assembly (4) comprises a box body (41) and a burner brick (42), the box body (41) is provided with an air inlet pipe (43) and a gas inlet pipe (44), the burner brick (42) is provided with an ignition gun (45); The medium supply assembly (5) comprises an air pipe (51) and a plurality of natural gas pipes (52), one end of the air pipe (51) is connected with the air inlet pipe (43), the other end of the air pipe (51) is connected with an air pump (53), one end of the natural gas pipe (52) is connected with the gas inlet pipe (44).

2. The reducing furnace hearth temperature optimization apparatus according to claim 1, wherein The box body (41) is internally provided with a heat accumulator (46), and the burner brick (42) is provided with a long waist hole (47).

3. The reducing furnace hearth temperature optimization apparatus as claimed in claim 1, wherein, The furnace top (2) is provided with a dust removal cover (7), and the furnace bottom (3) is provided with a heightening frame (8).

4. The reducing furnace hearth temperature optimization apparatus of claim 1, wherein, The furnace top (2) is provided with an upper water cooling pipe (9), the furnace bottom (3) is provided with a lower water cooling pipe (10), the upper water cooling pipe (9) and the lower water cooling pipe (10) are connected through a circulating water pipe (11), and the circulating water pipe (11) is connected with an inlet water pipe (12) and an outlet water pipe (13).

5. The reducing furnace hearth temperature optimization apparatus as claimed in claim 1, wherein, The natural gas pipe (52) is provided with a plurality of natural gas pipes (52), each of the natural gas pipes (52) is connected with the gas inlet pipe (44), and the natural gas pipe (52) is provided with an electromagnetic valve (54) and a ball valve (55).

6. The reducing furnace hearth temperature optimization apparatus of claim 1, wherein, The box body (41) is provided with an inspection door plate (48).

7. The reducing furnace hearth temperature optimization apparatus as claimed in claim 5, wherein, The device further comprises an electrical control subsystem, which comprises a plurality of temperature sensors (14) arranged on the inner wall of the furnace body (1), and the temperature sensors (14) are located on one side of the burner assembly (4).

8. The reducing furnace hearth temperature optimization apparatus as claimed in claim 2, wherein, The heat accumulator (46) is made of honeycomb ceramic material.

9. The reducing furnace hearth temperature optimization apparatus of claim 1, wherein, The furnace top (2) is further provided with an air duct gate valve (15).

10. A method for optimizing the temperature of the hearth of a reduction furnace, using the device for optimizing the temperature of the hearth of a reduction furnace according to any one of claims 1 to 9, characterized in that, The device comprises: S1: starting the air pump (53), conveying air to the box body (41) of the burner assembly (4) through the air pipe (51) and the air inlet pipe (43), and conveying natural gas to the box body (41) through the natural gas pipe (52) and the gas inlet pipe (44); S2: mixing the air and the natural gas in the box body (41), igniting the mixed gas by the ignition gun (45), forming a flame at the burner brick (42), and heating the reduction tank (6); S3: monitoring the temperature in the furnace chamber of the furnace body (1) in real time, comparing the monitored temperature signal with a preset target temperature value, and adjusting the valve opening degree of the natural gas pipe (52) in the medium supply assembly (5) and / or the power of the air pump (53) in real time according to the comparison result, so as to change the supply flow of the natural gas and the air, and stabilize the furnace chamber temperature near the target temperature value.

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