Vehicle bottom type carbon roasting furnace

Abstract

The utility model discloses a car bottom type carbon roasting furnace, which belongs to the technical field of heat treatment furnaces, comprises a furnace car (2) and a fixed furnace body (1) arranged above the furnace car, and is characterized in that a circulating fan (8) is arranged at the top of the fixed furnace body (1), a spraying device (9) is arranged on the left side of the circulating fan (8), a plurality of combustion nozzles (11) are arranged on the two sides of the circulating fan side by side, and the spraying device (9) is arranged on the top of the fixed furnace body (1). And a smoke exhaust pipeline (7) for exhausting smoke is arranged at the tail part of the fixed furnace body (1). According to the utility model, the smoke combustion mode of saggar-exhaust pipe-storage tank-combustor is completely abandoned, and the mode that smoke volatile matters are discharged to the incinerator for direct combustion is adopted, so that the comprehensive energy consumption of the ring type roasting furnace is below 3.6 * 106 kJ, and the energy consumption level of the domestic ring type roasting furnace is completely reached. Meanwhile, the gas leakage amount is extremely small, the temperature distribution in the furnace is uniform, the product homogeneity is good, and operation automation, temperature control precision, fuel utilization maximization and finished product high normalization are achieved.

Description

Technical Field

[0001] This utility model relates to a car-bottom type carbon roasting furnace, belonging to the field of heat treatment furnace technology. Background Technology

[0002] The heat treatment of carbon products requires four stages: preheating, heating, holding, and cooling. During the heating stage, a large amount of volatile asphalt fumes will be generated. The heating rate of the products must be strictly controlled during this period to avoid cracks caused by excessive local stress due to uneven local temperature. At the same time, the oxygen content in the furnace must be strictly controlled to keep the furnace in a reducing atmosphere to prevent the volatile asphalt fumes from exploding and causing the furnace temperature to run out of control or even endanger production safety.

[0003] Currently, the calcination of graphite electrode materials in my country generally adopts the covered ring calcination furnace. This type of furnace has the characteristics of low energy consumption and high output. However, the temperature difference of the covered ring calcination furnace is above 100℃. The large temperature difference leads to uneven internal stress in the product and cracks, which affects the product quality and service life.

[0004] The prior art discloses a car-bottom type roasting furnace and its usage method, application number 201410274692.9. The roasting furnace disclosed in this invention has a rectangular closed steel structure, with multiple crucibles with exhaust pipes installed inside the furnace. A volatile matter storage tank is installed on the top of the furnace and connected to the burner. The volatile matter generated in the crucibles enters the storage tank through the exhaust pipes for secondary combustion and utilization, thereby achieving the purpose of saving fuel. However, this technology has problems such as complex structure, high operation difficulty, frequent manual disassembly of exhaust pipes, and high labor intensity. Summary of the Invention

[0005] This utility model provides a car-bottom type carbon roasting furnace to solve the above-mentioned technical problems.

[0006] This utility model provides a car-bottom type carbon roasting furnace, including a furnace car and a fixed furnace body installed above the furnace car. The top of the fixed furnace body is equipped with a circulating fan, and a spray device is provided on the left side of the circulating fan. Several combustion nozzles are also arranged side by side on both sides of the circulating fan. The tail of the fixed furnace body is equipped with a smoke exhaust pipe for exhausting smoke.

[0007] Furthermore, the fixed furnace body is also equipped with a heat insulation module.

[0008] Furthermore, the fixed furnace body is provided with a furnace door at the front, and a water-cooled door frame is provided at the connection between the furnace door and the fixed furnace body.

[0009] Furthermore, the top of the furnace car is provided with a water seal groove, and the furnace car is connected to the fixed furnace body through the water seal groove.

[0010] Furthermore, a clean chimney is also provided on the top of the fixed furnace body.

[0011] Furthermore, the fixed furnace body is also equipped with a flue gas composition detector and a thermocouple, which are electrically connected.

[0012] The advantages of this utility model, employing the above technical solution, are as follows: It completely abandons the traditional flue gas combustion mode of sagger-exhaust pipe-storage tank-burner, instead using a method where flue gas volatiles are directly burned in the incinerator. The combusted flue gas undergoes multi-stage heat exchange, including heating heat transfer oil, heat exchange with combustion-supporting cold air, and steam production, to fully recover heat. Its comprehensive energy consumption reaches below 3.6 x 10⁶ kJ, fully meeting the energy consumption level of domestic ring-type roasting furnaces. Simultaneously, the furnace adopts a closed-loop structure design, minimizing gas leakage. Forced convection of flue gas within the furnace is achieved under the stirring of a circulating fan, controlling the temperature difference within ±10℃. This results in uniform temperature distribution and excellent product homogeneity, unmatched by other furnace types. Furthermore, the furnace door, water seal, exhaust, and spraying devices are all automated, requiring no manual on-site operation. The flue gas composition detector and thermocouples are linked with the combustion nozzle to ensure that the furnace temperature error between the set temperature and the actual temperature is ±0.5℃ and the oxygen content in the furnace is less than 3%, thereby achieving automated operation, precise temperature control, maximized fuel utilization, and high-specification finished products in the car-bottom carbon roasting furnace. Attached Figure Description

[0013] Figure 1 This is a main structural diagram of the car-bottom type carbon roasting furnace of this utility model;

[0014] In the diagram: 1. Fixed furnace body, 2. Furnace car, 3. Thermal insulation module, 4. Water seal trough, 5. Furnace door, 6. Water-cooled door frame, 7. Exhaust duct, 8. Circulating fan, 9. Spraying device, 10. Clean chimney, 11. Combustion nozzle, 12. Flue gas composition detector, 13. Thermocouple. Detailed Implementation

[0015] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments.

[0016] The terms "first," "second," etc. (if present) in the specification and claims of this utility model are used to distinguish similar objects, not to describe a specific order or sequence. Even if "second" is used before a technical feature for distinction, it does not necessarily imply the presence of "first." It should be understood that in this utility model, "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. It should be understood that in this utility model, "multiple" refers to two or more. "And / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, X and / or Y can represent: X alone, X and Y simultaneously, and Y alone. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "Containing X, Y, and Z," "Containing X, Y, and Z" means that all three X, Y, and Z are included; "Containing X, Y, or Z" means that one of X, Y, and Z is included; "Containing X, Y, and / or Z" means that any one, two, or three of X, Y, and Z are included.

[0017] like Figure 1 As shown, this utility model provides a car-bottom type carbon roasting furnace, including a furnace car 2 and a fixed furnace body 1 installed above the furnace car. The fixed furnace body 1 is characterized by: a circulating fan 8 at the top, a spray device 9 on the left side of the circulating fan 8, and several combustion nozzles 11 arranged side by side on both sides of the circulating fan 8. The fixed furnace body 1 is provided with a smoke exhaust pipe 7 for exhausting smoke at the rear.

[0018] The fixed furnace body 1 is also equipped with a heat insulation module 3. The heat insulation module 3 better maintains the temperature of the fixed furnace body 1. The heat insulation module 3 of the furnace body lining is heat resistant to 900~1200℃. The temperature during the firing process is generally not greater than 900℃, but under non-steady-state conditions or when some volatiles are burned, the temperature may exceed 1000℃. The thickness of the heat insulation module 3 can be 150~350mm.

[0019] The fixed furnace body 1 is provided with a furnace door 5 at the front, and a water-cooled door frame 6 is provided at the connection between the furnace door 5 and the fixed furnace body 1. The furnace door 5 is a steel component with an inner heat insulation module, and a lifting ring is provided at the top of the furnace door 5, which is lifted vertically by an electric winch.

[0020] The top of the furnace car 2 is provided with a water seal groove 4, and the furnace car 2 is connected to the fixed furnace body 1 through the water seal groove 4.

[0021] The top of the fixed furnace body 1 is also equipped with a clean chimney 10.

[0022] The fixed furnace body 1 is also equipped with a flue gas composition detector 12 and a thermocouple 13. The flue gas composition detector 12 is linked to the combustion nozzle, and the combustion nozzle automatically adjusts the ratio of fuel gas to combustion air to always ensure that the oxygen content in the furnace is below 3%.

[0023] During operation, the furnace car loaded with products enters the fixed furnace body 1, the furnace door 5 is closed and tightened, the water seal trough 4 is lifted to the set height by the lifting device, the flue gas pipe 7 is closed, the bell valve is opened, the circulating fan 8 is started, the circulating water system is turned on, fuel is injected into the combustion nozzle 11 and ignited, and the products enter the preheating stage; when the furnace temperature reaches 200℃, the bell valve is closed, the flue gas pipe 7 is opened, and the combustion nozzle 11 automatically adjusts the combustion power and air-fuel ratio according to the temperature setting curve and the oxygen content setting value, and the products enter the heating stage; when the furnace temperature reaches 850℃, the products enter the heat preservation stage, at which time the power of the combustion nozzle 11 reaches the maximum, and the oxygen content is controlled at about 0.1%; after heat preservation for 12~24 hours, the combustion nozzle 11 is shut off, the spray device 9 is turned on, the bell valve is opened, and the products enter the cooling stage, ready to be unloaded from the furnace.

[0024] In addition to the preferred embodiments described above, there are other embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection claimed by this utility model.

Claims

1. A car-bottom type carbon roasting furnace, comprising a furnace car (2) and a fixed furnace body (1) installed above the furnace car, characterized in that: The fixed furnace body (1) is provided with a circulating fan (8) at the top, a spray device (9) is provided on the left side of the circulating fan (8), and several combustion nozzles (11) are arranged side by side on both sides of the circulating fan (8). The fixed furnace body (1) is provided with a smoke exhaust pipe (7) for exhausting smoke at the tail.

2. The car-bottom type carbon roasting furnace according to claim 1, characterized in that: The fixed furnace body (1) is also equipped with a heat insulation module (3).

3. The car-bottom type carbon roasting furnace according to claim 1, characterized in that: The fixed furnace body (1) is provided with a furnace door (5) at the front, and a water-cooled door frame (6) is provided at the connection between the furnace door (5) and the fixed furnace body (1).

4. The car-bottom type carbon roasting furnace according to claim 1, characterized in that: The furnace car (2) is provided with a water seal groove (4) on the top, and the furnace car (2) is connected to the fixed furnace body (1) through the water seal groove (4).

5. The car-bottom type carbon roasting furnace according to claim 1, characterized in that: The top of the fixed furnace body (1) is also equipped with a clean chimney (10).

6. The car-bottom type carbon roasting furnace according to claim 1, characterized in that: The fixed furnace body (1) is also equipped with a flue gas composition detector (12) and a thermocouple (13).

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