A pre-carbonization treatment gas energy saving tunnel kiln

Abstract

This utility model discloses a gas-fired energy-saving tunnel kiln for pre-carbonization treatment, belonging to the field of lithium battery material sintering technology. It includes an inlet replacement chamber, a preheating section, a heating section, a heat preservation section, a quenching section, a slow cooling section, and an outlet replacement chamber connected in sequence. A waste heat boiler is provided in the quenching section, with a water inlet and a steam outlet. A propulsion device is provided below the inlet replacement chamber. The propulsion device drives the kiln car to move inside the tunnel kiln. The waste heat boiler absorbs heat from the quenching section to heat the cooling water, thereby utilizing the waste heat. The propulsion device pushes the kiln car from the bottom. The kiln car's movement distance is accurately controlled and the load that can be pushed is large, increasing the pre-carbonization treatment capacity of the tunnel kiln.

Description

Technical Field

[0001] This utility model relates to the field of lithium battery material sintering technology, specifically to a pre-carbonization treatment gas-fired energy-saving tunnel kiln. Background Technology

[0002] New energy vehicles, including pure electric vehicles, fuel cell vehicles, and electric vehicles, use lithium-ion batteries to power the vehicles. The battery materials of lithium-ion batteries are formed by sintering. In the sintering process, the battery materials need to undergo pre-carbonization treatment. Rotary kilns are generally used for pre-carbonization sintering of battery materials. However, when battery materials are loaded into the rotary kiln, the rotating structure of the kiln limits the formation of spherical products, resulting in unstable heating time and uneven carbonization. In addition, the commonly used heating temperature of battery materials is between 950 and 1150°C. Due to the material of the rotary kiln, the highest operating temperature does not exceed 1150°C, and the small loading capacity at one time leads to low pre-treatment efficiency. Therefore, there is a need for a tunnel kiln with a large loading capacity and high sintering temperature that can ensure energy utilization. Utility Model Content

[0003] The purpose of this invention is to provide a gas-fired energy-saving tunnel kiln for pre-carbonization treatment, which solves the problems of uneven heating and low energy utilization rate of existing battery materials during pre-carbonization treatment.

[0004] To achieve the above-mentioned objectives, the technical solution adopted by this utility model is as follows:

[0005] A pre-carbonization gas-fired energy-saving tunnel kiln includes an inlet replacement chamber, a preheating section, a heating section, a heat preservation section, a quenching section, a slow cooling section, and an outlet replacement chamber connected in sequence. A waste heat boiler is installed in the quenching section, with a water inlet and a steam outlet. A propulsion device is installed below the inlet replacement chamber, which drives the kiln car to move inside the tunnel kiln. The waste heat boiler absorbs heat from the quenching section to heat the cooling water, thus utilizing waste heat. The propulsion device pushes the kiln car from the bottom, and the kiln car's movement distance is accurately controlled and can push a large load, thereby increasing the pre-carbonization capacity of the tunnel kiln.

[0006] Furthermore, it also includes a waste gas treatment device, a smoke exhaust fan unit, a first smoke exhaust duct, valves, a flue gas recirculation fan, and a second smoke exhaust duct. One end of the first smoke exhaust duct is connected to the front half of the preheating section, and the other end of the first smoke exhaust duct is connected to one end of both the smoke exhaust fan unit and the flue gas recirculation fan. The valve is located between the flue gas recirculation fan and the preheating section. One end of the second smoke exhaust duct is connected to the rear half of the preheating section, and the other end of the second smoke exhaust duct is connected to one end of the flue gas recirculation fan. The other end of the flue gas recirculation fan is connected to the heating section and / or the insulation section. The smoke exhaust fan unit can send the waste gas generated by the heating material to the waste gas treatment device for harmless treatment to prevent environmental pollution. The flue gas recirculation fan can send the combustible gases volatilized from the material to the subsequent heating section or insulation section for combustion and utilization, reducing the energy consumption for heating and the amount of flue gas to be treated.

[0007] Furthermore, it also includes a gas supply pipeline and a combustion-supporting fan. The gas supply pipeline is connected to the heating section and the insulation section respectively. The air outlet of the combustion-supporting fan is connected to the heating section and the insulation section respectively. The air inlet of the combustion-supporting fan is connected to the slow cooling section, which is used to input gas into the heating section and the insulation section for heating materials.

[0008] As a preferred option, nitrogen pipelines and quenching fans are also included. Both the nitrogen pipelines and quenching fans are connected to the quenching section, and the supply of nitrogen can displace the gas in the furnace and carry away heat and air.

[0009] Even better, it also includes a hot air extraction fan and a slow cooling fan. The air inlet of the hot air extraction fan is connected to the slow cooling section, and the air outlet of the hot air extraction fan is connected to the external atmospheric environment. The air outlet of the slow cooling fan is connected to the slow cooling section, and the air inlet of the slow cooling fan is connected to the external atmospheric environment. Both the hot air extraction fan and the slow cooling fan are used to input cold air to cool the materials in the furnace.

[0010] Furthermore, it also includes a tail cooling section, which is located between the slow cooling section and the outlet replacement chamber, and is used for precise temperature control of the pre-carbonized material.

[0011] As a preferred option, a tail-cooling fan and an axial flow fan are also included. The axial flow fan is installed in the tail-cooling section and is connected to the axial flow fan. The tail-cooling fan has a large exhaust volume, which improves the accuracy of material exit temperature control.

[0012] As an even better option, the inlet replacement chamber is equipped with a first sealing door and a second sealing door, which are respectively located at both ends of the inlet replacement chamber. The inlet replacement chamber and the inlet replacement chamber have the same structure and are used to prevent air from mixing in when materials enter and exit the kiln.

[0013] Preferably, the propulsion device uses hydraulic power, and multiple crucibles containing raw materials are placed at intervals on the kiln car. Hydraulic propulsion can push a large load and control the movement distance with high accuracy.

[0014] Preferably, the furnace includes a furnace shell and an insulation layer disposed on the inner wall of the furnace shell, the insulation layer surrounding the kiln car to improve the utilization rate of heat.

[0015] The beneficial effects of this utility model are as follows:

[0016] (1) The pre-carbonization gas-fired energy-saving tunnel kiln is equipped with a waste heat boiler in the quench section. The waste heat boiler is equipped with cooling water. The waste heat boiler absorbs heat from the furnace to heat the cooling water, thus utilizing the waste heat. The steam generated in the waste heat boiler can be used externally. The kiln car for transporting materials is pushed forward by a propulsion device located at the bottom of the inlet replacement chamber. The propulsion device has a large force to push the kiln car and moves the kiln car accurately. The temperature control of the material at each stage is accurate, and a large amount of material can be fed in at one time for pre-carbonization treatment.

[0017] (2) The pre-carbonization gas-fired energy-saving tunnel kiln is equipped with a flue gas exhaust fan and a flue gas circulation fan, which can treat the flue gas generated by the preheating section to be harmless and prevent the flue gas from polluting the environment. The combustible gas generated by the material in the preheating section is sent to the heating section and the heat preservation section for combustion by the flue gas circulation fan, thereby reducing energy consumption and reducing pollutant emissions. Attached Figure Description

[0018] Figure 1 Structural diagram of the pre-carbonization treatment gas-fired energy-saving tunnel kiln provided by this utility model;

[0019] Figure 2 A structural diagram of the front half of the pre-carbonization treatment gas-fired energy-saving tunnel kiln provided by this utility model;

[0020] Figure 3 A structural diagram of the rear half of the pre-carbonization gas-fired energy-saving tunnel kiln provided by this utility model;

[0021] Figure 4 Front and side views of the kiln car provided for this utility model;

[0022] Figure 5 A cross-sectional view of the pre-carbonization treatment gas-fired energy-saving tunnel kiln provided by this utility model.

[0023] Figure label:

[0024] 1. Inlet replacement chamber; 11. First sealing door; 12. Second sealing door; 2. Preheating section; 21. Exhaust fan unit; 22. First exhaust duct; 23. Valve; 24. Flue gas circulation fan; 25. Second exhaust duct; 26. Waste gas treatment device; 3. Heating section; 31. Gas supply pipeline; 32. Combustion fan; 33. Nitrogen pipeline; 34. Quenching fan; 4. Insulation section; 5. Quenching section; 51. Waste heat boiler; 6. Slow cooling section; 61. Heat extraction fan; 7. Tail cooling section; 71. Slow cooling fan; 72. Tail cooling fan; 73. Axial flow fan; 8. Outlet replacement chamber; 9. Kiln car; 10. Propulsion device; 101. Inlet shuttle car; 102. Outlet shuttle car; 103. Crucible; 104. Furnace shell; 105. Insulation layer. Detailed Implementation

[0025] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0026] Example 1

[0027] like Figures 1-5 As shown, this embodiment discloses a pre-carbonization gas-fired energy-saving tunnel kiln, including an inlet replacement chamber 1, a preheating section 2, a heating section 3, a heat preservation section 4, a rapid cooling section 5, a slow cooling section 6, and an outlet replacement chamber 8 connected in sequence. A waste heat boiler 51 is provided in the rapid cooling section 5. The waste heat boiler 51 is provided with a water inlet and a steam outlet. Cooling water is injected into the waste heat boiler 51 through the water inlet. The cooling water can absorb the heat in the rapid cooling section 5. After absorbing heat, the cooling water vaporizes to generate water vapor. The water vapor can be used for external equipment and personnel, thereby making full use of the heat in the kiln. A propulsion device 10 is provided below the inlet replacement chamber 1. The propulsion device 10 drives the kiln car 9 to move in the tunnel kiln. The propulsion device 10 directly pushes the kiln car 9 to move in the kiln and can accurately control the distance traveled.

[0028] Among them, the propulsion device 10 adopts hydraulic power. Hydraulic drive has the advantages of strong load capacity and accurate movement. Multiple rows of crucibles 103 can be arranged side by side on the kiln car 9, which increases the preheating heat of the tunnel kiln in one go. The tunnel kiln can use a wide-body structure, thereby increasing the output.

[0029] Furthermore, it also includes a waste gas treatment device 26, a flue gas exhaust fan unit 21, a first flue gas duct 22, a valve 23, a flue gas recirculation fan 24, and a second flue gas duct 25. One end of the first flue gas duct 22 is connected to the front half of the preheating section 2, and the other end of the first flue gas duct 22 is connected to one end of the flue gas exhaust fan unit 21 and the flue gas recirculation fan 24, respectively. The valve 23 is located between the flue gas recirculation fan 24 and the preheating section 2. One end of the second flue gas duct 25 is connected to the rear half of the preheating section 2, and the other end of the second flue gas duct 25 is connected to one end of the flue gas recirculation fan 24. The other end of the flue gas recirculation fan 24 is connected to the heating section 3 and / or the insulation section 4. The exhaust fan unit 21 can extract the flue gas generated in the preheating section 2 and discharge it to the outside. It is used to discharge the waste gas when the material is preheated to prevent the waste gas from accumulating in the kiln and affecting the preheating reaction. The flue gas recirculation fan 24 is used to extract the combustible gas generated by heating the material and transport it to the heating section 3 or the insulation section 4. After mixing with the fuel gas, it is burned to reduce fuel consumption and the amount of waste gas to be treated. When flue gas needs to be recycled, the valve 23 can be opened to extract the flue gas from the preheating section 2.

[0030] Furthermore, it also includes a gas supply pipeline 31 and a combustion-supporting fan 32. The gas supply pipeline 31 is connected to the heating section 3 and the insulation section 4 respectively. The air outlet of the combustion-supporting fan 32 is connected to the heating section 3 and the insulation section 4 respectively. The air inlet of the combustion-supporting fan 32 is connected to the slow cooling section 6. The gas supply pipeline 31 is used to supply combustible gas to the heating section 3 and the insulation section 4. The combustion-supporting fan 32 is used to input oxygen to improve the combustion reaction efficiency, reduce the generation of impurities, and increase the heating rate.

[0031] Preferably, it also includes a nitrogen pipeline 33 and a quenching fan 34. Both the nitrogen pipeline 33 and the quenching fan 34 are connected to the quenching section 5. The nitrogen pipeline 33 inputs nitrogen into the quenching section 5. The nitrogen plays a role in heat dissipation and protection, preventing material oxidation. The quenching fan 34 is used to accelerate the efficiency of gas circulation.

[0032] More preferably, it also includes a hot air blower 61 and a slow cooling blower 71. The air inlet of the hot air blower 61 is connected to the slow cooling section 6, and the air outlet of the hot air blower 61 is connected to the external atmospheric environment. The air outlet of the slow cooling blower 71 is connected to the slow cooling section 6, and the air inlet of the slow cooling blower 71 is connected to the external atmospheric environment. The slow cooling blower 71 is used to input cooling gas and plays a role in slowly reducing the temperature of the materials in the kiln.

[0033] Furthermore, it also includes a tail cooling section 7, which is located between the slow cooling section 6 and the outlet displacement chamber 8, to control the temperature drop more smoothly and improve the cooling efficiency.

[0034] Furthermore, it also includes a tail-cooling fan 72 and an axial flow fan 73. The axial flow fan 73 is installed in the tail-cooling section 7. The tail-cooling fan 72 is connected to the axial flow fan 73. The axial flow fan 73 has a large air volume and can accurately control the cooling flow rate.

[0035] Preferably, the inlet replacement chamber 1 is provided with a first sealing door 11 and a second sealing door 12. The first sealing door 11 and the second sealing door 12 are respectively located at both ends of the inlet replacement chamber 1. The inlet replacement chamber 1 and the outlet replacement chamber 8 have the same structure and are used for ventilation when the kiln car 9 enters the furnace. This can prevent the entry of air, prevent the material from oxidizing during heating, and reduce the molding quality of the material.

[0036] Preferably, multiple crucibles 103 containing raw materials are placed at intervals on the kiln car 9. The crucibles 103 are spaced apart so that they can be fully heated by the gas in the furnace. A hot plate is provided at the bottom of the crucible 103 so that the bottom of the crucible 103 does not contact the end face of the kiln car 9, thus ensuring the uniformity of the temperature rise of the material inside the crucible 103.

[0037] Preferably, the furnace includes a furnace shell 104 and an insulation layer 105 on the inner wall of the furnace shell 104. The insulation layer 105 surrounds the kiln car 9 and provides insulation. A track is provided on the top of the furnace for the kiln car 9 to travel. The front and rear ends of the kiln car 9 are provided with slot structures that can be interlocked. The propulsion device 10 can push multiple kiln cars 9 to travel in the tunnel kiln at one time, ensuring a consistent travel rate.

[0038] The process of using this pre-carbonization gas-fired energy-saving tunnel kiln is as follows:

[0039] The material to be sintered is added into the crucible 103, and then the crucible 103 is placed on the kiln car 9 in sequence at intervals. The kiln car 9 is sent into the inlet replacement chamber 1 via the inlet shuttle car 101. After the kiln car 9 completes the replacement, it is pushed by the propulsion device 10 through the preheating section 2, the heating section 3, the heat preservation section 4, the rapid cooling section 5, the slow cooling section 6 and the tail cooling section 7 to complete the sintering and cooling. After cooling, the kiln car 9 moves to the outlet shuttle car 102 via the outlet replacement chamber 8 to complete the sintering of the material.

[0040] Based on the disclosure and teachings of the above specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, this utility model is not limited to the specific embodiments disclosed and described above, and any modifications and changes to this utility model should also fall within the protection scope of the claims of this utility model. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on this utility model.

Claims

1. A pre-carbonization gas-fired energy-saving tunnel kiln, comprising an inlet replacement chamber (1), a preheating section (2), a heating section (3), a heat preservation section (4), a rapid cooling section (5), a slow cooling section (6), and an outlet replacement chamber (8) connected in sequence, characterized in that: Waste heat boiler (51) is provided in the quench section (5). Waste heat boiler (51) is provided with water inlet and steam outlet. A propulsion device (10) is provided below the inlet replacement chamber (1). The propulsion device (10) drives the kiln car (9) to move in the tunnel kiln.

2. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to claim 1, characterized in that: It also includes a waste gas treatment device (26), a flue gas fan unit (21), a first flue gas duct (22), a valve (23), a flue gas circulation fan (24), and a second flue gas duct (25). One end of the first flue gas duct (22) is connected to the front half of the preheating section (2), and the other end of the first flue gas duct (22) is connected to one end of the flue gas fan unit (21) and the flue gas circulation fan (24), respectively. The valve (23) is located between the flue gas circulation fan (24) and the preheating section (2). One end of the second flue gas duct (25) is connected to the rear half of the preheating section (2), and the other end of the second flue gas duct (25) is connected to one end of the flue gas circulation fan (24). The other end of the flue gas circulation fan (24) is connected to the heating section (3) and / or the insulation section (4).

3. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to claim 2, characterized in that: It also includes a gas supply pipeline (31) and a combustion-supporting fan (32). The gas supply pipeline (31) is connected to the heating section (3) and the insulation section (4) respectively. The air outlet of the combustion-supporting fan (32) is connected to the heating section (3) and the insulation section (4) respectively. The air inlet of the combustion-supporting fan (32) is connected to the slow cooling section (6).

4. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to claim 3, characterized in that: It also includes a nitrogen pipeline (33) and a quenching fan (34), both of which are connected to the quenching section (5).

5. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to claim 1, characterized in that: It also includes a heat extraction fan (61) and a slow cooling fan (71). The air inlet of the heat extraction fan (61) is connected to the slow cooling section (6), the air outlet of the heat extraction fan (61) is connected to the external atmospheric environment, the air outlet of the slow cooling fan (71) is connected to the slow cooling section (6), and the air inlet of the slow cooling fan (71) is connected to the external atmospheric environment.

6. The pre-carbonization treated gas-fired energy-saving tunnel kiln according to claim 5, characterized in that: It also includes a tail cooling section (7), which is located between the slow cooling section (6) and the outlet replacement chamber (8).

7. The pre-carbonization treated gas-fired energy-saving tunnel kiln according to claim 6, characterized in that: It also includes a tail-cooling fan (72) and an axial flow fan (73). The axial flow fan (73) is installed in the tail-cooling section (7), and the tail-cooling fan (72) is connected to the axial flow fan (73).

8. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to claim 1, characterized in that: The inlet replacement chamber (1) is provided with a first sealing door (11) and a second sealing door (12). The first sealing door (11) and the second sealing door (12) are respectively located at both ends of the inlet replacement chamber (1). The inlet replacement chamber (1) and the outlet replacement chamber (8) have the same structure.

9. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to claim 1, characterized in that: The propulsion device (10) is hydraulically powered, and multiple crucibles (103) containing raw materials are placed at intervals on the kiln car (9).

10. The pre-carbonization treatment gas-fired energy-saving tunnel kiln according to any one of claims 1-9, characterized in that: It includes a furnace shell (104) and an insulation layer (105) installed on the inner wall of the furnace shell (104), the insulation layer (105) surrounding the kiln car (9).

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