Furnace lining structure and method capable of achieving furnace temperature control and waste heat utilization of molten salt chlorination furnace

Abstract

The invention relates to the technical field of molten salt chlorination furnaces, in particular to a furnace lining structure and method capable of achieving furnace temperature control and waste heat utilization of a molten salt chlorination furnace, and the furnace lining structure sequentially comprises a metal furnace shell, a heat insulation basalt plate layer, an anthracene oil graphite sealing layer, a first refractory clay brick layer, a phosphate pouring material layer and a second refractory clay brick layer from outside to inside. And a corrosion-resistant metal conduit is pre-buried in the phosphate castable layer. According to the furnace lining structure and method capable of achieving furnace temperature control and waste heat utilization of the fused salt chlorination furnace, the corrosion-resistant metal guide pipe is pre-buried in the phosphate pouring material layer, coarse TiCl4 clear liquid is utilized to circularly absorb heat in the guide pipe, and linkage control of the temperature sensor and the flow adjusting valve is combined, so that the temperature in the fused salt chlorination furnace can be accurately adjusted in real time. And compared with a traditional cooling mode of back spraying of high-solid-content materials, the problem that the gas amount in the furnace is suddenly increased due to spraying evaporation is solved, and the stability of the negative pressure in the furnace is effectively guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of molten salt chlorination furnaces, and specifically, to a lining structure and method capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace. Background Art

[0002] In the field of titanium metallurgy production, the furnace temperature control and waste heat utilization of molten salt chlorination furnaces are key links in the industrial production of titanium tetrachloride and sponge titanium. The carbon addition chlorination reaction of titanium slag, as the core process, is an exothermic reaction. External heating is required to reach the reaction temperature at the initial stage of startup, and subsequent self-heating can be relied on to continue.

[0003] Currently, molten salt treatment technologies in related fields have their own characteristics, but there are still deficiencies in the furnace temperature control and waste heat utilization of molten salt chlorination furnaces. For example, patent application number 202210720004.1 discloses a pretreatment method for molten salts, which is mainly applied to the pretreatment of molten salts used in the electrorefining of nuclear materials. Specifically, the proportionally prepared molten salts are placed in a magnesia crucible, evacuated and heated in a high-temperature vacuum resistance furnace, the specific raw materials are kept warm, and high-purity inert gas is filled and evacuated multiple times to control the water and oxygen content. After heating to the melting point and keeping warm, the temperature is lowered under vacuum, and after cooling to room temperature, it is taken out and plastic-sealed. This method focuses on the pretreatment of molten salts, simplifies the operation and controls the impurity content through specific processes. However, it does not involve the temperature regulation and waste heat utilization problems of molten salts during the actual reaction process.

[0004] Looking at the production process of molten salt chlorination furnaces, traditional technologies mostly use the backspray of crude titanium tetrachloride with a relatively high solid content (the slurry at the bottom of the rinsing tank) to control the furnace temperature. This method has obvious drawbacks. Spray evaporation will cause a sudden increase in the gas volume in the furnace, interfering with the negative pressure control in the furnace; the evaporation process makes the furnace gas entrain a large amount of fine powder raw materials, reducing the gravity dust collection effect; the reflux of crude TiCl4 impurities aggravates equipment corrosion and is prone to blockage, seriously affecting production efficiency and equipment life. Moreover, traditional technologies also have defects in waste heat utilization, failing to efficiently recover the reaction heat, resulting in energy waste and increased production costs. Therefore, it is urgent to develop a technical solution that can effectively control the furnace temperature and efficiently utilize waste heat according to the characteristics of molten salt chlorination furnaces to solve the deficiencies of traditional technologies and meet the requirements of titanium metallurgy industrial production. Summary of the Invention

[0005] The purpose of the present invention is to provide a lining structure and method capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace to solve the problems of sudden increase in the gas volume in the furnace caused by spray evaporation, interfering with the negative pressure control in the furnace; the evaporation process making the furnace gas entrain a large amount of fine powder raw materials, reducing the gravity dust collection effect; the reflux of crude TiCl4 impurities aggravating equipment corrosion and being prone to blockage, seriously affecting production efficiency and equipment life as mentioned in the above background art.

[0006] To achieve the above objectives, the present invention provides a furnace lining structure that can realize furnace temperature control and waste heat utilization of a molten salt chlorination furnace. The furnace lining structure includes, from the outside to the inside,: a metal furnace shell, an insulating basalt plate layer, an anthracene oil graphite sealing layer, a first refractory clay brick layer, a phosphate casting material layer, and a second refractory clay brick layer. A corrosion-resistant metal conduit is pre-embedded in the phosphate casting material layer, and a carbon fiber buffer layer is provided between the corrosion-resistant metal conduit and the phosphate casting material layer.

[0007] This setting constructs a multi-layer furnace lining structure from the outside to the inside. The metal furnace shell provides basic support, the insulating basalt plate layer reduces heat loss, the anthracene oil graphite sealing layer enhances the overall airtightness, the refractory clay brick layer resists high-temperature impact, and the corrosion-resistant metal conduit embedded in the phosphate casting material layer serves as the core heat exchange component. The second refractory clay brick layer directly withstands the high temperature and corrosion of the molten salt. The carbon fiber buffer layer is used to relieve the thermal stress caused by temperature changes. Each layer cooperates with each other to form a complete furnace lining system.

[0008] As a preferred solution of the present invention, the metal furnace shell is made of carbon steel to provide structural support, and the insulating basalt plate layer has a thickness of 20 mm and is used to reduce heat loss.

[0009] The metal furnace shell of this setting is made of carbon steel. Due to its good strength and toughness, it can withstand the pressure inside the furnace and the external mechanical force, providing a stable support framework for the entire furnace lining structure; the insulating basalt plate layer uses its low thermal conductivity to effectively prevent the heat in the furnace from being transferred to the outside, reducing heat loss.

[0010] As a preferred embodiment of the present invention, the anthracene oil graphite sealing layer has a thickness of 40-50 mm and is filled with a mixture of graphite powder and anthracene oil to enhance air tightness. The first refractory clay brick layer has a thickness of 80-100 mm and is used to withstand high temperature impact. The phosphate casting material layer has a thickness of 100 mm, and the second refractory clay brick layer has a thickness of 660-700 mm and is in direct contact with the molten salt, having high temperature and corrosion resistance. The carbon fiber buffer layer is used to absorb thermal stress.

[0011] This item sets the anthracene oil graphite sealing layer, which is filled with a mixture of graphite powder and anthracene oil. The lubricity of graphite and the adhesion of anthracene oil are used to form a dense sealing layer to prevent gas leakage in the furnace. The first refractory clay brick layer withstands the impact of the high temperature environment in the furnace with its high temperature resistance. The phosphate casting material layer and the second refractory clay brick layer are responsible for heat exchange and direct contact with molten salt respectively according to their different thicknesses and positions. The carbon fiber buffer layer uses the flexibility and high elasticity of carbon fiber to absorb the thermal stress caused by the expansion or contraction of various components due to temperature changes.

[0012] As a preferred embodiment of the present invention, the corrosion-resistant metal conduit serves as the core heat exchange layer, and the material is tantalum, zirconium alloy or Hastelloy C-276, and the inner wall is coated with a SiC or PTFE coating.

[0013] This setting selects corrosion-resistant materials such as tantalum, zirconium alloy or Hastelloy C-276 for the corrosion-resistant metal conduit because the reaction environment in the molten salt chlorination furnace is highly corrosive, and these materials can resist the erosion of corrosive media; the inner wall is coated with a SiC or PTFE coating to further enhance the corrosion resistance and non-stickiness of the conduit, preventing reaction substances from adhering to the inner wall of the conduit and affecting the heat exchange efficiency.

[0014] As a preferred embodiment of the present invention, the corrosion-resistant metal conduit is arranged in a spiral shape in the phosphate casting layer, covering the high-temperature reaction zone in the middle of the molten salt chlorination furnace, and the pitch is about 100 mm.

[0015] This setting arranges the corrosion-resistant metal conduit in a spiral shape in the phosphate casting layer, increasing the contact area between the conduit and the high-temperature reaction zone, enabling the conduit to absorb reaction heat more fully; covering the high-temperature reaction zone in the middle of the molten salt chlorination furnace and setting a pitch of about 100 mm to ensure uniform and efficient heat absorption, while ensuring that the crude TiCl4 clear liquid has a reasonable flow path and residence time in the conduit to achieve the best heat exchange effect.

[0016] As a preferred embodiment of the present invention, it further includes a cooling medium circulation system. The cooling medium circulation system includes a storage tank, a feeding pump, and a refined distillation vanadium removal system. The crude TiCl4 clear liquid is input from the storage tank through the feeding pump into the corrosion-resistant metal conduit, circulating at a flow rate of 5 m³ / h. After absorbing heat in the corrosion-resistant metal conduit, the preheated crude TiCl4 clear liquid enters the refined distillation vanadium removal system for refining.

[0017] This setting stores the crude TiCl4 clear liquid in the storage tank of the cooling medium circulation system, and the feeding pump provides power to input the clear liquid into the corrosion-resistant metal conduit. The temperature of the clear liquid rises after absorbing reaction heat in the conduit, and then enters the refined distillation vanadium removal system for refining, forming a complete circulation loop. Using the crude TiCl4 clear liquid as the heat exchange medium, the recovery and reuse of reaction heat are realized.

[0018] As a preferred embodiment of the present invention, the cooling medium circulation system further includes a temperature sensor and a flow regulating valve. The temperature sensor is linked with the flow regulating valve to adjust the flow rate of the crude TiCl4 clear liquid in real time and maintain the furnace temperature at 750 - 850 °C.

[0019] This setting enables the temperature sensor to monitor the furnace temperature in real time and feed the data back to the control system. The flow regulating valve automatically adjusts the flow rate of the crude TiCl4 clear liquid according to the feedback signal from the temperature sensor. When the furnace temperature rises, the flow rate of the clear liquid is increased to improve the heat exchange efficiency and reduce the furnace temperature; when the furnace temperature drops, the flow rate of the clear liquid is decreased to maintain the stability of the furnace temperature.

[0020] As a preferred embodiment of the present invention, the cooling medium circulation system further includes a safety valve and an exhaust gas system. The safety valve is installed at the outlet of the corrosion-resistant metal conduit, quickly releases gas when overpressure occurs, and is connected to the exhaust gas system.

[0021] This setting installs the safety valve at the outlet of the corrosion-resistant metal conduit. When the pressure in the conduit exceeds the set value, the safety valve automatically opens and quickly releases gas to prevent the conduit from bursting or other safety accidents caused by excessive pressure; the released gas is connected to the exhaust gas system for treatment to avoid the emission of harmful gases into the environment.

[0022] The present invention also provides a method for realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace, which is used for the furnace lining structure that can realize the furnace temperature control and waste heat utilization of the molten salt chlorination furnace, and includes the following steps:

[0023] S1. Input the crude TiCl4 clear liquid at a temperature of 25 - 50°C from the storage tank into the corrosion-resistant metal conduit through a charging pump;

[0024] S2. After the crude TiCl4 clear liquid absorbs heat through the corrosion-resistant metal conduit, the temperature rises to 80 - 100°C and enters the refining and distillation system for removing vanadium of crude titanium tetrachloride for refining;

[0025] S3. Through the linkage of the temperature sensor and the flow regulating valve, the flow rate of the crude TiCl4 clear liquid is adjusted in real time to maintain the furnace temperature at 750 - 850°C;

[0026] S4. When the pressure in the corrosion-resistant metal conduit is overpressure, quickly release gas through the safety valve and connect it to the exhaust gas system.

[0027] This setting realizes furnace temperature control and waste heat utilization through a series of orderly steps. First, the crude TiCl4 clear liquid is input into the conduit to absorb the reaction heat, and the heated clear liquid is used for refining preheating. The temperature sensor and the flow regulating valve are linked to adjust the flow rate of the clear liquid in real time to control the furnace temperature. The safety valve ensures the safety of the system when the pressure exceeds the limit. Each step cooperates with each other to form a complete operation process.

[0028] Compared with the prior art, the beneficial effects of the present invention:

[0029] 1. This lining structure and method for controlling the temperature and utilizing waste heat in a molten salt chlorination furnace pre-embeds a corrosion-resistant metal conduit within the phosphate casting layer. A crude TiCl₄ solution circulates within the conduit to absorb heat. Combined with the coordinated control of a temperature sensor and a flow control valve, this system enables real-time and precise temperature regulation within the molten salt chlorination furnace, maintaining it within the ideal range of 750-850°C. Compared to traditional cooling methods involving back-spraying high-solids materials, this method avoids the problem of sudden increases in furnace gas volume caused by spray evaporation, effectively ensuring a stable negative pressure within the furnace, creating a stable environment for the molten salt chlorination reaction, and significantly improving the controllability and stability of the reaction process.

[0030] 2. This furnace lining structure and method for temperature control and waste heat utilization in a molten salt chlorination furnace utilizes circulating crude TiCl₄ supernatant to absorb the reaction heat, raising the temperature of the crude TiCl₄ supernatant from 25-50°C to 80-100°C. This supernatant is then directly used to preheat the feedstock for the crude titanium tetrachloride refining and vanadium removal system. This process efficiently recovers and reuses waste heat from the reaction, and preliminary estimates suggest it can achieve a material preheating rate of 80-100 tons / day. This reduces power consumption in the titanium tetrachloride refining process by approximately 25% (80-100 kWh / ton of refined titanium), significantly reducing energy waste and lowering production costs for the company, aligning with the trend of energy conservation and emission reduction.

[0031] 3. This lining structure and method for temperature control and waste heat utilization in a molten salt chlorination furnace eliminates the traditional back-spraying of high-solids materials, avoiding the problem of fine powder material entrainment in the furnace gas due to spray evaporation. This effectively improves gravity dust collection and reduces the burden and cost of subsequent dust removal. Furthermore, it prevents the backflow of crude TiCl4 impurities into the reaction zone and gas passages, significantly reducing equipment corrosion, minimizing the risk of pipeline blockage, extending equipment life, reducing equipment maintenance frequency and costs, and improving production continuity and efficiency.

[0032] 4. The lining structure and method for achieving temperature control and waste heat utilization in a molten salt chlorination furnace adopts a multi-layer design consisting of a metal furnace shell, an insulating basalt plate layer, an anthracene oil graphite sealing layer, a refractory clay brick layer, and a phosphate casting material layer from the outside to the inside. Each layer of material performs different functions and works synergistically. Among them, the insulating basalt plate layer reduces heat loss, the anthracene oil graphite sealing layer enhances airtightness, the refractory clay brick layer withstands high-temperature impact, and the phosphate casting material layer combines with a corrosion-resistant metal conduit to achieve efficient heat exchange. The second refractory clay brick layer directly contacts the molten salt and has excellent high-temperature and corrosion resistance. In addition, the carbon fiber buffer layer provided between the corrosion-resistant metal conduit and the phosphate casting material layer can effectively absorb thermal stress, enhance the stability and reliability of the entire lining structure, and ensure the safety and stability of the equipment during long-term operation.

[0033] 5. This lining structure and method for temperature control and waste heat utilization in a molten salt chlorination furnace utilizes a temperature sensor and flow control valve to automatically adjust the flow rate of the crude TiCl4 clear solution, thereby precisely controlling the furnace temperature. Furthermore, a safety valve installed at the outlet of the corrosion-resistant metal conduit automatically and rapidly releases gas in the event of overpressure and connects it to the exhaust system, enabling automated emergency response. The entire system features intelligent control capabilities, reducing manual intervention, simplifying operation, and improving operational convenience and safety, thereby enhancing the automation level and management efficiency of the production process. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 It is a structural schematic diagram of the chlorination furnace lining structure of the present invention;

[0035] Figure 2 Schematic diagram of the arrangement of the corrosion-resistant metal conduits in the present invention;

[0036] Figure 3 is a system flow chart of the present invention;

[0037] The meaning of each number in the figure is:

[0038] 1. Metal furnace shell; 2. Insulating basalt plate layer; 3. Anthracene oil graphite sealing layer; 4. First refractory clay brick layer; 5. Phosphate casting material layer; 6. Corrosion-resistant metal conduit; 7. Second refractory clay brick layer; 8. Carbon fiber buffer layer; 9. Storage tank; 10. Feed pump; 11. Flow control valve; 12. Temperature sensor; 13. Safety valve; 14. Exhaust system; 15. Refining distillation vanadium removal system. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0040] The present invention provides a furnace lining structure and method for realizing temperature control and waste heat utilization of a molten salt chlorination furnace, such as Figure 1 As shown, the furnace lining structure includes, from the outside to the inside, a metal furnace shell 1, an insulating basalt plate layer 2, an anthracene oil graphite sealing layer 3, a first refractory clay brick layer 4, a phosphate casting material layer 5, and a second refractory clay brick layer 7. A corrosion-resistant metal conduit 6 is pre-buried inside the phosphate casting material layer 5, and a carbon fiber buffer layer 8 is provided between the corrosion-resistant metal conduit 6 and the phosphate casting material layer 5.

[0041] Construct a multi-layer furnace lining structure from the outside to the inside. The metal furnace shell 1 provides basic support, the adiabatic basalt board layer 2 reduces heat loss, the anthracene oil graphite sealing layer 3 enhances the overall airtightness, the first refractory clay brick layer 4 resists high-temperature impact, and the phosphate castable layer 5 is embedded with corrosion-resistant metal conduits 6 as the core heat exchange components. The second refractory clay brick layer 7 directly bears the high temperature and corrosion of molten salt. A carbon fiber buffer layer 8 is provided between the corrosion-resistant metal conduit 6 and the phosphate castable layer 5 to relieve the thermal stress generated by temperature changes. Each layer cooperates with each other to form a complete furnace lining system. This multi-layer composite structure design clearly defines the functions of each layer. The metal furnace shell 1, the adiabatic basalt board layer 2, etc. work together to ensure both the structural strength and airtightness of the furnace lining, and lay a foundation for subsequent heat exchange, temperature control, and equipment protection, enabling the furnace lining to operate stably in harsh environments such as high temperature and corrosion, and extending the service life of the equipment.

[0042] In this embodiment, the metal furnace shell 1 is made of carbon steel and is used to provide structural support. The adiabatic basalt board layer 2 has a thickness of 20 mm and is used to reduce heat loss.

[0043] The metal furnace shell 1 is made of carbon steel. Because it has good strength and toughness, it can withstand the pressure inside the furnace body and external mechanical forces, providing a stable support framework for the entire furnace lining structure. The adiabatic basalt board layer 2 has a thickness of 20 mm. Utilizing its low thermal conductivity, it effectively blocks the heat in the furnace from conducting to the outside world, reducing heat loss. By combining the support of the metal furnace shell 1 and the heat insulation effect of the adiabatic basalt board layer 2, the stability of the furnace lining structure under complex working conditions is ensured, heat loss is reduced, energy utilization efficiency is improved, the energy cost in the production process is lowered, and at the same time, the safety hazards caused by heat transfer to the surrounding environment of the furnace body are reduced.

[0044] Specifically, the thickness of the anthracene oil graphite sealing layer 3 is 40 - 50 mm and is filled with a mixture of graphite powder and anthracene oil for enhancing airtightness. The thickness of the first refractory clay brick layer 4 is 80 - 100 mm for withstanding high-temperature impact; the phosphate castable layer has a thickness of 100 mm, and the second refractory clay brick layer 7 has a thickness of 660 - 700 mm, directly contacting molten salt and having high-temperature and corrosion resistance. The carbon fiber buffer layer 8 is used to absorb thermal stress.

[0045] The thickness of the anthracene oil graphite sealing layer 3 is 40 - 50 mm. It is filled with a mixture of graphite powder and anthracene oil. Using the lubricity of graphite and the adhesiveness of anthracene oil, a dense sealing layer is formed to prevent gas leakage in the furnace. The thickness of the first refractory clay brick layer 4 is 80 - 100 mm. Relying on its high-temperature resistance, it withstands the impact of the high-temperature environment in the furnace. The thickness of the phosphate castable layer 5 is 100 mm, and the thickness of the second refractory clay brick layer 7 is 660 - 700 mm. According to different thicknesses and positions, they respectively undertake the tasks of heat exchange and direct contact with molten salt. The carbon fiber buffer layer 8 utilizes the flexibility and high elasticity of carbon fiber to absorb the thermal stress generated by the expansion or contraction of each component due to temperature changes. It enhances the airtightness of the furnace lining, ensures the stability of the reaction environment in the furnace, and avoids safety problems and a decrease in reaction efficiency caused by gas leakage. The first refractory clay brick layer 4 and the second refractory clay brick layer 7 effectively protect the internal structure from high-temperature damage. The carbon fiber buffer layer 8 prevents damage to the furnace lining structure caused by thermal stress, improving the overall reliability and durability of the furnace lining.

[0046] Furthermore, the corrosion-resistant metal conduit 6 serves as the core heat exchange layer, and its material is tantalum, zirconium alloy, or Hastelloy C - 276. The inner wall is coated with a SiC or PTFE coating.

[0047] The corrosion-resistant metal conduit 6 serves as the core heat exchange layer, and the materials selected are tantalum, zirconium alloy, or Hastelloy C - 276 because the reaction environment in the molten salt chlorination furnace is highly corrosive, and these materials can resist the erosion of corrosive media. Its inner wall is coated with a SiC or PTFE coating to further enhance the corrosion resistance and non-stickiness of the conduit, preventing reaction substances from adhering to the inner wall of the conduit and affecting the heat exchange efficiency. It ensures that the corrosion-resistant metal conduit 6 can work stably for a long time in a harsh corrosion environment, maintaining high-efficiency heat exchange performance, avoiding equipment failures and production interruptions caused by conduit corrosion damage, and at the same time reducing the cleaning and maintenance work required due to substance adhesion, thus reducing the maintenance cost.

[0048] Furthermore, as Figure 3 shown, the corrosion-resistant metal conduit 6 is arranged in a spiral shape in the phosphate castable layer 5, covering the high-temperature reaction zone in the middle of the molten salt chlorination furnace, and the pitch is about 100 mm.

[0049] The corrosion-resistant metal conduit 6 is arranged in a spiral shape in the phosphate castable layer 5, covering the high-temperature reaction zone in the middle of the molten salt chlorination furnace. The pitch is about 100 mm. Such a design increases the contact area between the conduit and the high-temperature reaction zone, enabling the conduit to absorb the reaction heat more fully. At the same time, it ensures that the crude TiCl4 clear liquid has a reasonable flow path and residence time in the conduit to achieve the best heat exchange effect. Significantly improve the heat exchange efficiency, enabling the crude TiCl4 clear liquid to fully absorb the reaction heat, providing an adequate heat source for subsequent waste heat utilization and furnace temperature control, accurately controlling the furnace temperature, ensuring that the reaction proceeds under suitable temperature conditions, and improving product quality and production efficiency.

[0050] Furthermore, as Figure 2 shown, it also includes a cooling medium circulation system. The cooling medium circulation system includes a storage tank 9, a feeding pump 10, and a refining and distilling vanadium removal system 15. The crude TiCl4 clear liquid is input from the storage tank 9 into the corrosion-resistant metal conduit 6 through the feeding pump 10 and circulates at a flow rate of 5 m³ / h. The crude TiCl4 clear liquid that has completed preheating after absorbing heat in the corrosion-resistant metal conduit 6 enters the refining and distilling vanadium removal system 15 for refining.

[0051] The cooling medium circulation system includes a storage tank 9, a feeding pump 10, and a refining and distilling vanadium removal system 15. The crude TiCl4 clear liquid is stored in the storage tank 9, and the feeding pump 10 provides power to input the clear liquid into the corrosion-resistant metal conduit 6. The temperature of the clear liquid rises after absorbing the reaction heat in the conduit and then enters the refining and distilling vanadium removal system 15 for refining, forming a complete circulation loop. Using the crude TiCl4 clear liquid as the heat exchange medium, the recovery and reuse of the reaction heat are realized. The heat generated by the molten salt chlorination furnace reaction is effectively recovered and used for preheating the raw materials in the crude titanium tetrachloride refining process, reducing additional energy consumption, improving energy utilization efficiency, reducing production costs, and at the same time achieving the organic combination of furnace temperature control and waste heat utilization, optimizing the production process.

[0052] Furthermore, as Figure 2 shown, the cooling medium circulation system also includes a temperature sensor 12 and a flow regulating valve 11. The temperature sensor 12 is linked with the flow regulating valve 11 to adjust the flow rate of the crude TiCl4 clear liquid in real time and maintain the furnace temperature at 750 - 850 °C.

[0053] The cooling medium circulation system further includes a temperature sensor 12 and a flow regulating valve 11. The temperature sensor 12 monitors the temperature inside the furnace in real time and feeds the data back to the control system. The flow regulating valve 11 automatically adjusts the flow rate of the crude TiCl4 clear liquid according to the feedback signal from the temperature sensor 12. When the furnace temperature rises, the flow rate of the clear liquid is increased to improve the heat exchange efficiency and reduce the furnace temperature; when the furnace temperature drops, the flow rate of the clear liquid is decreased to maintain the stability of the furnace temperature. Precise and dynamic control of the furnace temperature is achieved, enabling the furnace temperature to always be maintained within the ideal range of 750 - 850 °C, ensuring that the molten salt chlorination reaction proceeds under stable temperature conditions, improving the controllability of the reaction and the stability of product quality, and reducing production abnormalities and product quality problems caused by temperature fluctuations.

[0054] Further, as Figure 2 shown, the cooling medium circulation system further includes a safety valve 13 and an exhaust gas system 14. The safety valve 13 is installed at the outlet of the corrosion-resistant metal conduit 6, quickly releases gas when overpressure occurs, and is connected to the exhaust gas system 14.

[0055] The cooling medium circulation system further includes a safety valve 13 and an exhaust gas system 14. The safety valve 13 is installed at the outlet of the corrosion-resistant metal conduit 6. When the pressure inside the conduit exceeds the set value, the safety valve 13 automatically opens to quickly release gas, preventing the conduit from bursting or other safety accidents caused by excessive pressure; the released gas is connected to the exhaust gas system 14 for treatment to avoid the emission of harmful gases into the environment. It provides safety protection for the cooling medium circulation system, effectively preventing equipment damage and safety risks caused by abnormal pressure, ensuring the safety of equipment and personnel; at the same time, treating the discharged gas meets environmental protection requirements and reduces environmental pollution.

[0056] The present invention also provides a method for realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace, which is used for the furnace lining structure capable of realizing the furnace temperature control and waste heat utilization of the molten salt chlorination furnace, and includes the following steps:

[0057] S1. Input the crude TiCl4 clear liquid with a temperature of 25 - 50 °C from the storage tank 9 into the corrosion-resistant metal conduit 6 through the charging pump 10;

[0058] S2. After the crude TiCl4 clear liquid absorbs heat through the corrosion-resistant metal conduit 6, the temperature rises to 80 - 100 °C and enters the refining and distillation vanadium removal system 15 of crude titanium tetrachloride for refining;

[0059] S3. Through the linkage of the temperature sensor 12 and the flow regulating valve 11, the flow rate of the crude TiCl4 clear liquid is adjusted in real time to maintain the furnace temperature at 750 - 850 °C;

[0060] S4. When the pressure in the corrosion-resistant metal conduit 6 is overpressure, quickly release gas through the safety valve 13 and connect it to the exhaust gas system 14.

[0061] Based on the lining structure described in Claims 1 - 9, the furnace temperature control and waste heat utilization are achieved through a series of ordered steps. First, the crude TiCl4 clear liquid at a temperature of 25 - 50°C is input from the storage tank 9 into the corrosion-resistant metal conduit 6 by the charging pump 10 to absorb the reaction heat. The heated clear liquid then enters the refining and distillation system 15 for vanadium removal of crude titanium tetrachloride for refining; the temperature sensor 12 and the flow regulating valve 11 are linked to adjust the flow rate of the clear liquid in real time to control the furnace temperature; when the pressure in the corrosion-resistant metal conduit 6 exceeds the pressure limit, the gas is quickly released through the safety valve 13 and connected to the tail gas system 14. Each step cooperates with each other to form a complete operation process. The precise control of the molten salt chlorination furnace temperature and the efficient utilization of the reaction waste heat are realized, the production process is optimized, the energy utilization efficiency is improved, the production cost and safety risks are reduced, and at the same time, the continuity and stability of the production process are ensured, enhancing the economic benefits and competitiveness of the enterprise.

[0062] Finally, it should be noted that for the temperature sensor 12, the safety valve 13, etc. in this embodiment, the electronic components in the above components are all general standard components or components known to those skilled in the art. Their structures and principles can be known by those skilled in the art through technical manuals or obtained through conventional experimental methods. At the idle places of this device, all the above electrical components are respectively connected by wires. The specific connection means should refer to the working sequence of each electrical component in the above working principle to complete the electrical connection, which are all well-known technologies in the art.

[0063] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only the preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A lining structure capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace, characterized in that: The furnace lining structure comprises, from the outside to the inside, a metal furnace shell (1), an insulating basalt plate layer (2), an anthracene oil graphite sealing layer (3), a first refractory clay brick layer (4), a phosphate casting material layer (5), and a second refractory clay brick layer (7). A corrosion-resistant metal conduit (6) is pre-buried inside the phosphate casting material layer (5), and a carbon fiber buffer layer (8) is provided between the corrosion-resistant metal conduit (6) and the phosphate casting material layer (5).

2. The lining structure capable of realizing the furnace temperature control and waste heat utilization of the molten salt chlorination furnace according to claim 1, wherein: The metal furnace shell (1) is made of carbon steel to provide structural support, and the insulating basalt plate layer (2) has a thickness of 20 mm and is used to reduce heat loss.

3. The lining structure capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace according to claim 1, characterized in that: The anthracene oil graphite sealing layer (3) has a thickness of 40-50 mm and is filled with a mixture of graphite powder and anthracene oil to enhance air tightness. The first refractory clay brick layer (4) has a thickness of 80-100 mm and is used to withstand high temperature impact. The phosphate casting material layer has a thickness of 100 mm. The second refractory clay brick layer (7) has a thickness of 660-700 mm and is in direct contact with the molten salt, and has high temperature resistance and corrosion resistance. The carbon fiber buffer layer (8) is used to absorb thermal stress.

4. The lining structure capable of realizing the furnace temperature control and waste heat utilization of the molten salt chlorination furnace according to claim 1, characterized in that: The corrosion-resistant metal conduit (6) serves as the core heat exchange layer and is made of tantalum, zirconium alloy or Hastelloy C-276, and its inner wall is coated with SiC or PTFE coating.

5. The lining structure capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace according to claim 4, characterized in that: The corrosion-resistant metal conduit (6) is arranged in a spiral shape in the phosphate casting material layer (5), covering the high-temperature reaction zone in the middle of the molten salt chlorination furnace, with a pitch of about 100 mm.

6. The lining structure capable of realizing the furnace temperature control and waste heat utilization of a fused salt chlorination furnace according to claim 1, characterized in that: It also includes a cooling medium circulation system, which includes a storage tank (9), a feed pump (10), and a refined distillation vanadium removal system (15).

7. The lining structure capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace according to claim 6, wherein: The crude TiCl4 clear liquid is fed from the storage tank (9) to the corrosion-resistant metal conduit (6) via the feed pump (10) and circulated at a flow rate of 5m³ / h. After absorbing heat in the corrosion-resistant metal conduit (6), the preheated crude TiCl4 clear liquid enters the refined distillation vanadium removal system (15) for refining.

8. The lining structure capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace according to claim 1, wherein: The cooling medium circulation system further comprises a temperature sensor (12) and a flow regulating valve (11). The temperature sensor (12) and the flow regulating valve (11) are linked to each other to adjust the flow rate of the crude TiCl4 clear solution in real time to maintain the furnace temperature at 750-850°C.

9. The lining structure capable of realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace according to claim 1, characterized in that: The cooling medium circulation system further comprises a safety valve (13) and an exhaust system (14). The safety valve (13) is installed at the outlet of the corrosion-resistant metal conduit (6), quickly releases gas when overpressure occurs, and is connected to the exhaust system (14).

10. A method for realizing the furnace temperature control and waste heat utilization of a molten salt chlorination furnace, which is used for the furnace lining structure capable of realizing the furnace temperature control and waste heat utilization of the molten salt chlorination furnace according to any one of claims 1-9, and is characterized in that: The steps include: S1, the crude TiCl4 clear liquid at a temperature of 25-50°C is fed from the storage tank (9) to the corrosion-resistant metal conduit (6) via the feed pump (10); S2, the crude TiCl4 clear liquid absorbs heat through the corrosion-resistant metal conduit (6), and the temperature rises to 80-100°C, and enters the crude titanium tetrachloride refining distillation and vanadium removal system (15) for refining; S3, through the linkage of the temperature sensor (12) and the flow control valve (11), the flow rate of the crude TiCl4 clear liquid is adjusted in real time to maintain the furnace temperature at 750-850℃; S4. When the pressure inside the corrosion-resistant metal conduit (6) exceeds the rated pressure, the gas is quickly released through the safety valve (13) and connected to the tail gas system (14).

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