Waste salt melting equipment

Abstract

The utility model discloses waste salt melting equipment, and relates to a furnace with a waste heat utilization device, the melting equipment comprises a waste heat boiler and a combustion chamber, the waste heat boiler is connected with the combustion chamber, a discharge port is arranged below the connection position of the waste heat boiler and the combustion chamber, the bottom of the combustion chamber is of a multi-layer structure, and the bottom of the combustion chamber is provided with a discharge port. A feeding port and a combustor are arranged at the position close to the furnace top of the combustion chamber. According to the waste salt melting treatment equipment, oxygen and natural gas are added in the combustion chamber, the combustion speed of waste salt is increased, the waste salt can be fully combusted, the efficiency is high, meanwhile, the cost is low, and large-batch waste salt treatment is facilitated.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of furnace, specifically to a kind of waste salt melting equipment with waste heat utilization device. BACKGROUND

[0002] A large amount of by-product salt is produced in industrial production process, most of which is dissolved in industrial water. The salt-containing water is mixed with some organic matter and some impurities due to many process links. The by-product salt obtained by evaporation and crystallization is an industrial waste salt containing salt, water and a small amount of other impurities, which cannot be directly used as raw material for downstream products. Chemical waste salt contains various toxic substances, with organic matter being the most harmful. In the face of increasingly stringent environmental protection policies, the treatment and disposal of waste salt have become a growing concern.

[0003] High-temperature treatment method is to treat waste salt at high temperature, so that organic impurities contained in dry salt are decomposed into gas at high temperature, thereby achieving the purpose of removing organic impurities. In the high-temperature method, melting treatment is widely used and has good treatment effect. However, in the prior art, the space of the melting furnace is closed, which leads to insufficient combustion of waste salt, and the combustion products are still harmful. Moreover, the waste salt treatment has high energy consumption. Although the system disclosed in the publication No. CN119178321A can recover waste heat, it needs to recover waste heat from waste salt and requires multiple processes to burn waste salt multiple times. The structure is complex, maintenance is difficult, although the utilization rate is high, but the initial investment cost is large, and the investment recovery period is long. SUMMARY

[0004] The utility model aims to provide a kind of waste salt melting equipment with simple structure and high efficiency. The utility model has simple structure, and the furnace can be a fixed building. The waste salt in the utility model stays in the combustion chamber for a long time, so the combustion is more complete. The further purpose of the utility model is to generate power by using waste heat generated by waste salt combustion, thereby improving energy utilization efficiency. Another purpose of the utility model is to blow oxygen-rich air into the combustion chamber during the waste salt combustion process, so that the waste salt can be fully combusted to produce only carbon dioxide, water and other harmless products, thereby avoiding the generation of additional harmful pollutants due to insufficient combustion. Natural gas is also introduced into the position of the burner to assist the combustion of waste salt.

[0005] The utility model achieves the above technical purposes through the following technical means.

[0006] A waste salt melting equipment includes a waste heat boiler and a combustion chamber. The waste heat boiler and the combustion chamber are connected. A discharge port is provided below the connection position of the waste heat boiler and the combustion chamber. The bottom of the combustion chamber is a multi-layer structure. An inlet and a burner are provided near the top of the combustion chamber.

[0007] Further, the feeding port is located in the combustion chamber, away from one side of the waste heat boiler, close to the furnace wall.

[0008] As preferred, the burner is located on the furnace wall of the combustion chamber, away from the waste heat boiler.

[0009] As preferred, the connection position of the combustion chamber and the waste heat boiler is the tail gas flue, and the discharge port is below the connection position of the tail gas flue and the waste heat boiler.

[0010] Further, the combustion chamber comprises a molten pool and a tail gas flue, and the height at the connection position of the molten pool and the tail gas flue gradually decreases compared with the height of the molten pool.

[0011] Further, the multi-layer structure of the bottom of the combustion chamber comprises at least two layers of heat insulation bricks from outside to inside, and the heat insulation bricks are clamped with a furnace shell, and the heat insulation bricks on the inside and the furnace shell are clamped with an asbestos board.

[0012] Further, the heat insulation bricks on the inside are further separated from the molten pool by castable and refractory bricks, and the refractory bricks are covered with a furnace bottom.

[0013] As preferred, the bottom of the combustion chamber is provided with a bubble, and the bubble is filled with oxygen-enriched air, and the oxygen content of the oxygen-enriched air is 50% to 90%.

[0014] As preferred, the furnace top of the combustion chamber is constructed by refractory bricks, and the furnace top is fixedly connected by an arch top hanger.

[0015] As preferred, the burner is an oxygen-enriched burner, and the fuel is natural gas.

[0016] The present application has the following gain effects:

[0017] Compared with the prior art device structure, the waste salt melting treatment device of the present application can accelerate the burning speed of waste salt by increasing oxygen and natural gas in the combustion chamber, and can make the waste salt burn fully, which is efficient and low in cost, and is beneficial to large-scale waste salt treatment. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 It is a structural schematic view of the waste salt melting device of the present application.

[0019] Figure 2 It is a structural schematic view of the waste salt melting device of the present application. Figure 1 It is a local enlarged view of A in the middle.

[0020] In the figure, 1-steel frame, 2-furnace shell, 3-asbestos plate, 4-insulation brick, 5-castable, 6-refractory brick, 7-bubble, 8-molten pool, 9-feeding port, 10-furnace top, 11-arch top hanger, 12-burner, 13-exhaust flue, 14-discharge port, 15-waste heat boiler, 16-furnace bottom, 17-furnace wall, 18-combustion chamber. DETAILED DESCRIPTION

[0021] The utility model will be further explained in connection with the drawings and specific embodiments, but the protection scope of the utility model is not limited to this.

[0022] Example one:

[0023] As Figures 1 to 2 indicated, a kind of waste salt melting equipment, including waste heat boiler 15 and combustion chamber 18, the waste heat boiler 15 and the combustion chamber 18 are connected, the waste heat boiler 15 and the combustion chamber 18 connection position below is equipped with discharge port 14, the bottom of the combustion chamber 18 is multilayer structure, and feeding port 9 and burner 12 are equipped in the position close to the furnace top of the combustion chamber 18.

[0024] This embodiment introduces a kind of equipment for the melting treatment of waste salt in chemical industry, the equipment purpose is to realize the safe, sufficient melting treatment of waste salt, the organic matter in waste salt is fully combusted to be harmless inorganic substance such as carbon dioxide and water, while waste heat can be recycled, is used for power generation or heating, improves energy utilization efficiency.The core component of the equipment includes combustion chamber 18 and waste heat boiler 15, which are connected to each other, waste salt treatment and waste heat recycling system.

[0025] Combustion chamber 18 and waste heat boiler 15 are communicated by exhaust flue 13.The purpose is to effectively guide the high-temperature flue gas generated in combustion chamber 18 into waste heat boiler 15, and recycle the waste heat in combustion exhaust gas.Below the connection position of exhaust flue 13 and waste heat boiler 15, discharge port 14 is provided.The position of discharge port 14 is relatively low, which facilitates the smooth discharge of molten salt liquid from the equipment.

[0026] Combustion chamber 18 is mainly composed of molten pool 8 and exhaust flue 13.Molten pool 8 is the main space for waste salt melting reaction, and waste salt receives heat and melts in this area.Exhaust flue 13 serves as a channel for guiding high-temperature flue gas to enter waste heat boiler.

[0027] The bottom of combustion chamber 18 adopts a multilayer composite structure, which aims to achieve good heat preservation and insulation effect, avoid pollution to the environment caused by leakage of harmful substances, and reduce heat loss and protect the structure of the furnace body.From outside to inside, the bottom structure includes at least two layers of insulation bricks 4.The insulation bricks 4 can be made of lightweight, low thermal conductivity refractory materials to effectively block heat transfer.

[0028] Between the two adjacent layers of heat preservation bricks 4, a furnace shell 2 is arranged. The furnace shell 2 is usually welded by steel plates, and mainly provides structural support for the internal heat preservation layer and plays a protective role as an outer shell. Between the heat preservation bricks 4 close to the inner side of the molten pool 8 and the furnace shell 2, a stone wool board 3 is also arranged. The stone wool board 3 has good high-temperature resistance and heat insulation performance, further enhancing the heat preservation effect of the bottom.

[0029] Between the inner heat preservation bricks 4 and the molten pool 8, a castable 5 and a refractory brick 6 are arranged in sequence. The castable 5 is usually selected from refractory castables, which is used to fill the brick joints, form a smooth working surface, and further improve the overall integrity and airtightness of the structure.

[0030] The refractory brick 6 is directly in contact with the high-temperature molten salt, and needs to have excellent high-temperature resistance, molten salt corrosion resistance and thermal shock resistance. Above the refractory brick 6, a furnace bottom 16 is laid. The furnace bottom 16 is a structural layer that directly bears the molten salt, and needs to have similar performance requirements as the refractory brick 6, and select different materials and thicknesses of refractory materials according to the actual working conditions.

[0031] In order to improve the melting efficiency and uniformity of the molten salt, a bubbling 7 device is installed at the bottom of the combustion chamber 18. The function of the bubbling 7 device is to blow oxygen-rich air into the molten pool 8. The oxygen content of the oxygen-rich air is controlled within the range of 50% to 90%. Through bubbling, it promotes the uniform transfer of heat in the molten salt, and at the same time can enhance the stirring action of the molten salt in the molten pool, and accelerate the melting process. The use of oxygen-enriched air also improves the combustion efficiency of the fuel and increases the combustion temperature.

[0032] The furnace top 10 of the combustion chamber 18 is built with refractory bricks. The furnace top 10 is designed as an arch structure, which has good stability in mechanics, can withstand high temperature and internal pressure of the hearth, and reduce the deformation of the furnace top structure. The furnace top 10 is fixedly connected through the dome hanger 11. The dome hanger 11 supports and fixes the furnace top 10, prevents the furnace top 10 from collapsing, and ensures the long-term stability and safety of the furnace top 10 structure.

[0033] The combustion chamber 18 is equipped with a burner 12 and a feed inlet 9. The burner 12 is an oxygen-enriched burner, and the fuel is natural gas. Oxygen-enriched combustion can increase the combustion temperature in the molten pool 8, accelerate the melting process, and reduce the generation of harmful gases such as nitrogen oxides and carbon monoxide. Natural gas as fuel has the advantages of clean combustion, high heat value, easy control, etc. The feed inlet 9 is arranged at the position close to the furnace wall 17 of the furnace top 10 of the combustion chamber 18, and is located on the side away from the waste heat boiler 15 in the combustion chamber 18. The burner 12 is installed on the furnace wall 17 away from the waste heat boiler 15 of the combustion chamber 18. The positions of the feed inlet 9 and the burner 12 are relatively arranged, which increases the combustion time of the waste salt, improves the melting efficiency, and reduces the possibility of un-melted materials entering the tail gas flue.

[0034] The combustion chamber 18 is in the shape of a cuboid horizontally arranged. The horizontal structure is more conducive to the horizontal flow of materials and the discharge of molten salt. The cuboid shape is convenient for the utilization of the internal space of the hearth and the structural design. The feed inlet 9 is located on the side wall of the smelting furnace near one end of the smelting furnace burner 12, and the burner 12 is also located on the upper part of the side wall of the smelting furnace. The height of the discharge outlet 14 is lower than that of the feed inlet 9, and the height difference is used to form a gravity flow to assist the discharge of the molten salt and prevent the backflow of flue gas from the discharge outlet.

[0035] The furnace bottom 6 is designed to be downwardly inclined from the side of the burner 12 to the side of the discharge outlet, with an inclination of 0.01. This inclined design is conducive to the flow of molten salt in the direction of the discharge outlet under the action of gravity, reduces the salt accumulation in the molten pool, and ensures the smooth and continuous discharge of the molten salt.

[0036] The preferred range of the length-width ratio of the smelting furnace is set to 1.7-3.5. The appropriate length-width ratio helps to optimize the gas flow organization and temperature field distribution in the hearth, improve the thermal efficiency and melting uniformity. The preferred range of the depth of the molten pool 8 is set to 0.41-0.95 m.

[0037] The depth of the molten pool needs to be considered comprehensively according to the processing capacity, melting characteristics, residence time and other factors. The hearth clearance height, i.e. the distance from the molten salt surface of the molten pool 8 to the furnace top 10. In this embodiment, the preferred range of the hearth clearance height is set to 0.8-1.47 m.

[0038] The hearth clearance height affects the gas space and combustion space in the hearth, and needs to be matched with the performance of the burner and the characteristics of the flame. The total height of the hearth, i.e. the height from the furnace bottom 16 to the furnace top 10, is preferably set to 1.26-2.22 m. The furnace bottom 16 adopts a reverse arch structure. The reverse arch furnace bottom helps to improve the structural strength of the furnace bottom, increases the residence time of the molten salt in the molten pool 8, and increases the combustion time of the molten salt. The furnace top 10 adopts an arch structure. The arched furnace top has good structural stability and carrying capacity, and can adapt to long-term operation in high-temperature environment.

[0039] The chemical waste salt is added to the improved waste salt smelting furnace through the feed inlet 9 for smelting treatment, and the residence time of the molten salt in the molten pool 8 is controlled within the range of 4-24 h. The length of the smelting residence time is related to the type and composition of the waste salt, the melting point, the initial state and the required smelting degree. Adjusting the residence time of the molten salt in the molten pool 8 according to the different characteristics of the waste salt can optimize the smelting effect and processing efficiency.

[0040] The waste heat boiler 15 is used to recover the heat in the high-temperature flue gas discharged from the combustion chamber 18. The waste heat boiler 15 can be of horizontal or vertical structure, which is suitable for different site conditions and layout requirements. The waste heat boiler 15 can adopt a natural circulation boiler or a forced circulation boiler.

[0041] Natural circulation boilers rely on the density difference of the working medium to form circulation power, and the structure is relatively simple; forced circulation boilers use water pumps to provide circulation power, and the circulation is more reliable and more adaptable. The specific selection can be determined comprehensively according to the actual process parameters, steam demand, and the convenience of operation and maintenance, etc.

[0042] The heat recovered by the waste heat boiler 15 can be used to generate steam or hot water, which can be used for chemical production processes, or for heating, power generation and other purposes, thereby improving energy utilization efficiency, reducing energy consumption, and reducing waste heat emissions directly to the environment.

[0043] Example two:

[0044] The structure of this embodiment is the same as that of the melting equipment of example one, and the melting process is further described.

[0045] As shown in Figures 1 to 2 A waste salt melting equipment, including a waste heat boiler 15 and a combustion chamber 18, the waste heat boiler 15 and the combustion chamber 18 are connected, and a discharge port 14 is arranged below the connection position of the waste heat boiler 15 and the combustion chamber 18, the bottom of the combustion chamber 18 is a multi-layer structure, and a feeding port 9 and a burner 12 are arranged near the top of the combustion chamber 18.

[0046] This embodiment introduces in detail a device for melting treatment of chemical waste salt. The purpose of the device is to realize safe and sufficient melting treatment of waste salt, and to fully burn the organic matter in the waste salt into harmless inorganic matter such as carbon dioxide and water, while recycling the waste heat for power generation or heating, thereby improving the utilization efficiency of energy. The core components of the device include a combustion chamber 18 and a waste heat boiler 15, which are connected to each other, and a waste salt treatment and waste heat recycling system.

[0047] The combustion chamber 18 and the waste heat boiler 15 are connected through a tail gas flue 13. The purpose is to effectively guide the high-temperature flue gas generated in the combustion chamber 18 into the waste heat boiler 15, and to recycle the waste heat in the combustion tail gas. A discharge port 14 is arranged below the connection position of the tail gas flue 13 and the waste heat boiler 15. The position of the discharge port 14 is relatively low, which is convenient for the smooth discharge of the molten salt liquid from the equipment.

[0048] The combustion chamber 18 mainly consists of a molten pool 8 and a tail gas flue 13. The molten pool 8 is the main space for waste salt melting reaction, and the waste salt receives heat and melts in this area. The tail gas flue 13 is used as a channel for guiding high-temperature flue gas into the waste heat boiler.

[0049] The bottom of the combustion chamber 18 adopts a multi-layer composite structure, aiming to achieve good heat preservation effect, avoid pollution to the environment caused by the leakage of harmful substances, and protect the structure of the furnace body. At the same time, less heat loss. From the outside to the inside, the bottom structure at least contains two layers of insulation bricks 4. The insulation bricks 4 can be made of lightweight, low thermal conductivity refractory materials to effectively block heat transfer.

[0050] Between the two adjacent layers of insulation bricks 4, a furnace shell 2 is arranged. The furnace shell 2 is usually welded by steel plates, and mainly provides structural support for the internal insulation layer and plays a protective role as an outer shell. Between the insulation bricks 4 near the inner side of the molten pool 8 and the furnace shell 2, there is also a asbestos board 3. The asbestos board 3 has good high temperature resistance and heat insulation performance, further enhancing the heat preservation effect of the bottom.

[0051] Between the inner insulation bricks 4 and the molten pool 8, there are castable 5 and refractory bricks 6 in turn. The castable 5 is usually made of refractory castable, which is used to fill the brick joints, form a smooth working surface, and further improve the overall structure and airtightness.

[0052] The refractory bricks 6 are directly in contact with the high-temperature molten salt and need to have excellent high-temperature resistance, molten salt corrosion resistance and thermal shock resistance. Above the refractory bricks 6, there is a furnace bottom 16. The furnace bottom 16 is a structural layer that directly bears the molten salt and needs to have similar performance requirements as the refractory bricks 6, and different materials and thicknesses of refractory materials are selected according to the actual working conditions.

[0053] In order to improve the melting efficiency and uniformity of the molten salt, the bottom of the combustion chamber 18 is equipped with a bubbling 7 device. The function of the bubbling 7 device is to blow oxygen-rich air into the molten pool 8. The oxygen content of the oxygen-rich air is controlled within the range of 50%~90%. Through bubbling, it promotes the uniform transfer of heat in the molten salt, and at the same time can enhance the stirring action of the molten salt in the molten pool and speed up the melting process. The use of oxygen-enriched air also improves the combustion efficiency of the fuel and increases the combustion temperature.

[0054] The top of the combustion chamber 18 is made of refractory bricks. The top 10 of the furnace is designed as an arch structure, which has good stability in mechanics and can withstand high temperature and internal pressure of the furnace, and reduce the deformation of the top structure. The top 10 is fixed and connected by the arch top hanger 11. The arch top hanger 11 supports and fixes the top 10 of the furnace to prevent the top 10 from collapsing and ensure the long-term stability and safety of the top 10 structure.

[0055] The combustion chamber 18 is equipped with a burner 12 and a feeding port 9. The burner 12 is an oxygen-enriched burner, and the fuel is natural gas. Oxygen-enriched combustion can increase the combustion temperature in the molten pool 8, accelerate the melting process, and reduce the generation of harmful gases such as nitrogen oxides and carbon monoxide. Natural gas as fuel has the advantages of clean combustion, high calorific value, and easy control. The feeding port 9 is arranged at the position close to the furnace wall 17 on the top 10 of the combustion chamber 18, and is located on the side of the combustion chamber 18 away from the waste heat boiler 15. The burner 12 is installed on the furnace wall 17 of the combustion chamber 18 away from the waste heat boiler 15. The positions of the feeding port 9 and the burner 12 are opposite, which increases the burning time of waste salt, improves the melting efficiency, and reduces the possibility of unmelted material entering the tail gas flue.

[0056] The combustion chamber 18 is in the shape of a horizontal long rectangular cuboid. The horizontal structure is more conducive to the horizontal flow of materials and the discharge of molten salt. The long rectangular cuboid shape is convenient for the utilization of the internal space of the hearth and the structural design. The feeding port 9 is located on the side wall of the melting furnace close to the melting furnace burner 12 at one end, and the burner 12 is also located on the upper part of the side wall of the melting furnace. The height of the discharge port 14 is lower than that of the feeding port 9, and the height difference is used to form a gravity flow to assist the discharge of molten salt and prevent the backflow of flue gas from the discharge port.

[0057] The furnace bottom 6 is designed to be downwardly inclined from the side of the burner 12 to the side of the discharge port, with a slope of 0.01. This inclined design is conducive to the flow of molten salt in the direction of the discharge port under the action of gravity, reduces the accumulation of salt in the molten pool, and ensures the smooth and continuous discharge of molten salt.

[0058] The preferred range of the length-width ratio of the melting furnace is set to be 1.7-3.5. A suitable length-width ratio helps to optimize the gas flow organization and temperature field distribution in the hearth, improve the thermal efficiency and melting uniformity. The preferred range of the depth of the molten pool 8 is set to be 0.41-0.95 m.

[0059] The depth of the molten pool needs to be considered comprehensively according to the processing capacity, melting characteristics, residence time and other factors. The hearth clearance height, i.e. the distance from the molten salt surface of the molten pool 8 to the roof 10 of the furnace. In this embodiment, the preferred range of the hearth clearance height is set to be 0.8-1.47 m.

[0060] The hearth clearance height affects the gas space and combustion space in the hearth, and needs to be matched with the performance of the burner and the characteristics of the flame. The total height of the hearth, i.e. the height from the furnace bottom 16 to the roof 10 of the furnace, is preferably set to be 1.26-2.22 m. The furnace bottom 16 adopts a reverse arch structure. The reverse arch furnace bottom helps to improve the structural strength of the furnace bottom, increases the residence time of the molten salt in the molten pool 8, and increases the burning time of the molten salt. The roof 10 adopts an arch structure. The arch-shaped roof has good structural stability and carrying capacity, and can adapt to long-term operation in high-temperature environment.

[0061] The chemical waste salt is added into the improved waste salt melting furnace through the feeding port 9 for melting treatment, and the residence time of the molten salt in the molten pool 8 is controlled within the range of 4-24 hours. The length of the melting residence time is related to the type and composition of the waste salt, the melting point, the initial state, and the required melting degree, etc. According to the different characteristics of the waste salt, the residence time of the molten salt in the molten pool 8 is adjusted to optimize the melting effect and treatment efficiency.

[0062] The waste heat boiler 15 is used to recover the heat in the high-temperature flue gas discharged from the combustion chamber 18. The waste heat boiler 15 can be selected as a horizontal or vertical structure, which is suitable for different site conditions and layout requirements. The waste heat boiler 15 can adopt a natural circulation boiler or a forced circulation boiler.

[0063] The natural circulation boiler relies on the density difference of the working medium to form the circulation power, and the structure is relatively simple; the forced circulation boiler adopts a water pump to provide the circulation power, and the circulation is more reliable and adaptable. The specific selection can be determined comprehensively according to the actual process parameters, steam demand, and the convenience of operation and maintenance, etc.

[0064] The heat recovered by the waste heat boiler 15 can be used to generate steam or hot water, which can be used for chemical production processes, or for heating, power generation, and other purposes, thereby improving energy utilization efficiency, reducing energy consumption, and reducing the direct emission of waste heat to the environment.

[0065] The waste salt enters the molten pool 8 in the combustion chamber 18 from the feeding port 9, and is rapidly heated into a molten state in an oxygen-rich environment under the auxiliary combustion of natural gas input by the burner 12, forming molten salt. The organic matter in the molten salt is continuously burned and decomposed in the oxygen-rich environment. Because it is an oxygen-rich environment, the decomposition of the organic matter is more complete, and the combustion products in the waste salt are generally only harmless inorganic substances such as carbon dioxide and water vapor. With the flow of the molten salt, at the position of the tail gas flue 13, the flue gas density of the molten salt combustion is small, and it floats up and enters the waste heat boiler 15 for waste heat recovery and utilization.

[0066] The molten salt in the molten state with high density flows out from the discharge port 14 and enters the next process.

Claims

1. A waste salt melting apparatus, characterized by, The application relates to a waste heat boiler (15) and a combustion chamber (18), wherein the waste heat boiler (15) and the combustion chamber (18) are connected, a discharge port (14) is arranged below the connecting position of the waste heat boiler (15) and the combustion chamber (18), the bottom of the combustion chamber (18) is a multilayer structure, and an inlet port (9) and a burner (12) are arranged near the top of the combustion chamber (18).

2. A waste salt melting apparatus according to claim 1, wherein The inlet port (9) is arranged on the side of the combustion chamber (18) far away from the waste heat boiler (15) and close to the furnace wall (17).

3. The waste salt melting apparatus according to claim 1, wherein The burner (12) is arranged on the furnace wall (17) of the combustion chamber (18) far away from the waste heat boiler (15).

4. The waste salt melting apparatus according to claim 1, wherein The connecting position of the combustion chamber (18) and the waste heat boiler (15) is a tail gas flue (13), and the discharge port (14) is arranged below the connecting position of the tail gas flue (13) and the waste heat boiler (15).

5. A waste salt melting apparatus as claimed in claim 1 or 2 or 3 or 4, wherein, The combustion chamber (18) comprises a molten pool (8) and a tail gas flue (13), and the height of the connecting position of the molten pool (8) and the tail gas flue (13) gradually decreases compared with the height of the molten pool (8).

6. A waste salt melting apparatus according to claim 5, wherein The multilayer structure of the bottom of the combustion chamber (18) comprises at least two layers of heat preservation bricks (4) from outside to inside, the heat preservation bricks (4) are clamped with a furnace shell (2) therebetween, and the heat preservation bricks (4) on the inner side are clamped with an asbestos board (3) between the heat preservation bricks (4) and the furnace shell (2).

7. A waste salt melting apparatus according to claim 6, wherein The heat preservation bricks (4) on the inner side are further separated from the molten pool (8) by castable (5) and refractory bricks (6), and the refractory bricks (6) are covered with a furnace bottom (16).

8. A waste salt melting apparatus as claimed in claim 1 or 2 or 3 or 4 or 6 or 7, wherein, The bottom of the combustion chamber (18) is provided with a bubble (7), the bubble (7) is filled with oxygen-enriched air, and the oxygen content of the oxygen-enriched air is 50%-90%.

9. A waste salt melting apparatus as claimed in claim 1 or 2 or 3 or 4 or 6 or 7, wherein, The top of the combustion chamber (18) is constructed by refractory bricks, and the top (10) is fixedly connected by an arch top hanger (11).

10. The waste salt melting apparatus as claimed in claim 1 or 2 or 3 or 4 or 6 or 7, wherein, The burner (12) is an oxygen-enriched burner, and the fuel is natural gas.

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