Method and device for roasting carbon block material in tunnel kiln

Abstract

The invention discloses a carbon block material tunnel kiln roasting method which comprises the following steps: feeding a carbon block material blank impregnated with asphalt into an inlet of a tunnel kiln, and moving at a constant speed to pass through the tunnel kiln for roasting; the tunnel kiln is sequentially divided into a heating section, a maintaining section and a cooling section; in the moving direction of the carbon block material blank, the temperature of a heating section is gradually increased to 700-800 DEG C from 350-480 DEG C, and the temperature of a maintaining section is gradually reduced to 550-650 DEG C from 700-800 DEG C; the temperature of the cooling section is gradually reduced from 550 DEG C to 650 DEG C to 250 DEG C to 350 DEG C; flue gas flow of the heating section flows to a low-temperature position from a high-temperature position; the flue gas is pumped away near the low-temperature position and fed into a tunnel kiln combustion chamber, and the flue gas combusted in the tunnel kiln combustion chamber is led to the high-temperature position to form first flue gas circulation. Through specific temperature control in the roasting process, stable quality of the carbon block material is realized, meanwhile, the production cost is reduced, and the safety is improved.

Description

Technical Field

[0001] The present invention relates to the field of preparation of carbon block materials, and in particular to a tunnel kiln roasting technology for carbon block material blanks after impregnation with asphalt to penetrate the pores of the carbon block material blanks when manufacturing carbon block materials such as graphite electrodes. Background Art

[0002] The production process of carbon block materials generally includes batching, kneading, molding, primary roasting, impregnation, secondary roasting, graphitization, and mechanical processing. To produce graphite electrodes or joint blanks with higher volume density requirements, the green blanks must be impregnated and roasted twice with coal tar or petroleum asphalt after roasting, and then loaded into the graphitization furnace. The advantages of loading the semi-finished products after impregnation into the graphitization furnace after secondary roasting are: improving the yield of the graphitization process; reducing the power consumption of the graphitization process; greatly reducing the harmful gases discharged during the graphitization process, improving the production environment; and increasing the asphalt coking value and the volume density of the finished product.

[0003] If the temperature control of the carbon block material blank is unreasonable during the roasting process in the tunnel kiln after impregnation, the carbon block material blank will be affected by internal stress, which will affect the quality defects of the subsequent graphitization products. In addition, unreasonable roasting temperature control will also cause energy waste and increase production costs.

[0004] The large amount of volatiles generated by the secondary roasting of the carbon block material blanks after impregnation during the roasting process in the tunnel kiln will cause serious air pollution if they are directly discharged. Although the gas circulation device is also used in the production of carbon block materials to draw the high-temperature volatile smoke into the combustion chamber, it is hoped that the volatiles will be burned by the combustion flame, and then sent to the kiln to roast the carbon block materials. However, in reality, the combustion process and temperature of the volatiles in the combustion chamber are not well controlled, and the volatiles often accumulate in the tunnel kiln to cause fire, causing safety hazards.

[0005] CN2023110136416 A graphitization furnace, a control system and a graphitization method, providing a graphitization furnace and a control system and a graphitization method that can recycle the heat or waste heat generated in the secondary roasting process or the cooling process after the secondary roasting into the graphitization furnace for preheating operation, and at the same time can transport the heat in the graphitization furnace after graphitization is completed to the secondary roasting furnace for preheating treatment.

[0006] CN201210315816.4 A heating graphite for a heat exchanger and a preparation method thereof, the preparation method comprising crushing, screening, batching, kneading, molding, primary roasting, primary impregnation, secondary roasting and graphitization to obtain a finished product, the ignition temperature of the secondary roasting is 220-230°C, the maximum temperature of the secondary roasting is 1100-1150°C, the particle size of the filler around the secondary roasted product is 2-6mm; the distance between the secondary roasted product and the fire wall is not less than 150mm. Summary of the invention

[0007] The purpose of the present invention is to provide a method and device for baking carbon block materials in a tunnel kiln, which can achieve stable quality of carbon block materials, reduce production costs and improve safety through specific temperature control during baking process. The present invention prevents the accumulation of high-temperature volatile smoke by controlling the circulation mode of smoke, and reduces gas consumption and achieves full combustion of high-temperature volatile smoke by controlling the size of the combustion fire.

[0008] The present invention adopts the following technical solutions: A method for roasting carbon block materials in a tunnel kiln, comprising: The asphalt-impregnated carbon block material is fed into the tunnel kiln entrance and moves through the tunnel kiln at a constant speed for roasting; The tunnel kiln is divided into the heating section, the holding section, and the cooling section in sequence; Along the moving direction of the carbon block material blank, the temperature of the heating section is gradually increased from 350℃~480℃ to 700℃~800℃, the temperature of the holding section is gradually decreased from 700℃~800℃ to 550℃~650℃; the temperature of the cooling section is gradually decreased from 550℃~650℃ to 250℃~350℃; In the temperature rising stage, the flue gas flows from the high temperature to the low temperature; the flue gas is extracted near the low temperature and sent to the tunnel kiln combustion chamber. The flue gas after combustion in the tunnel kiln combustion chamber flows to the high temperature, forming the first flue gas circulation.

[0009] As an optimization, the carbon block material tunnel kiln roasting method has a tunnel kiln length of 30 to 120 meters; the heating section length is 14 to 56 meters, the holding section length is 8 to 32 meters, and the cooling section length is 8 to 32 meters.

[0010] As an optimization, in the tunnel kiln roasting method of carbon block materials, the time taken for the carbon block material blanks to move in the heating section is 14 to 140 hours, the time taken for the carbon block material blanks to move in the holding section is 8 to 80 hours, and the time taken for the carbon block material blanks to move in the cooling section is 8 to 80 hours.

[0011] As an optimization, the flue gas flow in the cooling section flows from the low-temperature end to the high-temperature end, the flue gas is extracted near the high-temperature end for cooling, and the cooled flue gas is directed to the low-temperature end to form a second flue gas cycle.

[0012] As an optimization, the tunnel kiln roasting method of carbon block material is such that the temperature of the heating section is gradually increased from 430℃~480℃ to 750℃~800℃ along the moving direction of the carbon block material blank.

[0013] The flue gas flow in the cooling section flows from the low-temperature end near the tunnel kiln outlet to the high-temperature end near the holding section. The flue gas is extracted near the high-temperature end of the cooling section and sent to the heat exchanger for cooling. The cooled flue gas flows to the low-temperature end of the cooling section, forming the second flue gas cycle.

[0014] As an optimization, the combustion temperature of the tunnel kiln combustion chamber is repeatedly cycled between 800℃ and 860℃; that is, when the combustion temperature of the tunnel kiln combustion chamber rises to 860℃, it is adjusted to a low fire; when the combustion temperature of the tunnel kiln combustion chamber drops to 800℃, it is adjusted to a high fire; and this cycle is repeated. Compared with the previous constant temperature combustion method used in the combustion chamber, it is impossible to fully burn the asphalt volatiles in the flue gas, and black smoke is discharged from the exhaust pipe, causing great pollution. At the same time, the inlet temperature in the heating stage is greater than 450℃, and the factory has experienced several fire accidents of carbon block material blanks.

[0015] The charcoal block material tunnel kiln roasting device includes: a gas combustion chamber for burning gas to generate high-temperature flue gas and burning volatiles generated by charcoal block material blanks; a roasting chamber for placing charcoal block material blanks, and the roasting chamber is divided into a heating chamber, a holding chamber, and a cooling chamber according to different temperature changes; the front half of the heating chamber is provided with a flue gas return pipe, and the flue gas return pipe is connected to the gas combustion chamber; the rear half of the heating chamber is provided with a first flue gas output pipe, the holding chamber is provided with a second flue gas output pipe, and the gas combustion chamber is connected to the first flue gas output pipe and the second flue gas output pipe. The front half of the cooling chamber is provided with a flue gas cooling pipe, and the rear half of the cooling chamber is provided with a low-temperature flue gas pipe, the flue gas cooling pipe is connected to a heat exchanger, and the heat exchanger is connected to the low-temperature flue gas pipe.

[0016] As an optimization, the tunnel kiln roasting device for carbon block materials has 30 to 60 workstations arranged in the tunnel kiln roasting chamber, each workstation is 0.5 to 4 meters long, and the carbon block material blanks stay in each workstation for 1 hour to 5 hours; the length of the heating chamber is 14 to 28 workstations, the length of the holding chamber is 8 to 16 workstations, and the length of the cooling chamber is 8 to 16 workstations; at the front of the heating chamber, at least four flue gas return ducts are connected; at the rear of the heating chamber, at least four first flue gas output ducts are connected.

[0017] As an optimization, in the carbon block material tunnel kiln roasting device, the first flue gas output pipe and the second flue gas output pipe are both connected with an opening adjustment device.

[0018] As an optimization, the carbon block material tunnel kiln roasting device is provided with multiple first flue gas output pipes. When working, the opening degree of the first flue gas output pipe closest to the holding chamber is at the maximum state to promote flue gas circulation.

[0019] As an optimization, the carbon block material tunnel kiln roasting device, the gas combustion chamber is connected with a gas pipeline with adjustable opening and a damper pipeline with adjustable opening; the temperature of the gas combustion chamber is controlled at 800℃~860℃; When the temperature reaches 850℃~860℃, reduce the gas pipeline opening and the damper pipeline opening; When the temperature reaches 800℃~810℃, restore the gas pipeline opening and the damper pipeline opening.

[0020] Compared with the prior art, the present invention has the following beneficial effects: 1) The tunnel kiln roasting chamber of the present invention adopts specific temperature control; while ensuring the stability of the quality of the carbon block material, it ensures the effective and rapid release of high-temperature volatile flue gas in the heating section; in addition, the layout of the two flue gas circulation spaces in the tunnel kiln roasting chamber and the flat flue gas space in the middle ensures that the high-temperature volatile flue gas is efficiently circulated to the combustion chamber.

[0021] 2) The present invention reduces gas consumption and ensures that high-temperature volatile flue gas is fully burned in the combustion chamber by repeatedly controlling the large and small flames in the combustion chamber at 800°C to 860°C; compared with the previous method without the use of large and small flame control, the exhaust flue gas is cleaner and the blackening phenomenon no longer exists.

[0022] 3) By controlling the circulation mode of flue gas and the size of the combustion fire, the enrichment of high-temperature volatile flue gas in the temperature rising section is greatly reduced; compared with the previous phenomenon of spontaneous combustion of carbon block material blanks at the entrance of the tunnel kiln is reduced to zero, and the safety has been greatly improved; thereby increasing the entrance temperature of the tunnel kiln by more than 450°C, further reducing the length of the tunnel kiln roasting chamber, reducing the energy consumption of the tunnel kiln, and reducing production costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 This is a schematic diagram of a tunnel kiln roasting device for carbon block materials according to Example 1 of the present invention.

[0024] Figure 2 This is a schematic diagram of the tunnel kiln roasting method for carbon block materials in Example 5 of the present invention. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0026] Example 1: Tunnel kiln roasting device for carbon block materials, such as Figure 1 As shown, arrows represent the direction of airflow; comprising: a gas combustion chamber 1 for burning gas to generate high-temperature flue gas and burning volatiles generated by carbon block material blanks; The tunnel kiln roasting chamber is used to place the carbon block material blank. The tunnel kiln roasting chamber is divided into a heating chamber 2, a holding chamber 3, and a cooling chamber 4 according to different temperature changes; the front end of the heating chamber 2 is provided with an entrance door 11, and the end of the cooling chamber 4 is provided with an exit door 12; the front half of the heating chamber 2 is provided with a flue gas return pipe 5, and the flue gas return pipe 5 is connected to the gas combustion chamber 1 through an exhaust device; the rear half of the heating chamber 2 is provided with a first flue gas output pipe 6, and the holding chamber 3 is provided with a second flue gas output pipe 7, and the gas combustion chamber 1 is connected to the first flue gas output pipe 6 and the second flue gas output pipe 7; the first flue gas output pipe 6 and the second flue gas output pipe 7 are both connected to an opening adjustment device. The front half of the cooling chamber 3 is provided with a flue gas cooling pipe 8, and the rear half of the cooling chamber 3 is provided with a low-temperature flue gas pipe 9, and the flue gas cooling pipe 8 is connected to a heat exchanger 10, and the heat exchanger 10 is connected to a low-temperature flue gas pipe 9. The gas combustion chamber 1 is also connected to an exhaust pipe 13, and the exhaust pipe 13 is connected to a cooling heat exchanger 14. During operation, the opening of the first smoke output duct 6 closest to the holding chamber 3 is at the maximum opening. The first smoke output duct 6 and the smoke return duct 5 form a first smoke circulation space; the low-temperature smoke duct 9 and the smoke cooling duct 8 form a second smoke circulation space; and a relatively flat smoke space is formed near the second smoke output duct 7.

[0027] The gas combustion chamber 1 is connected to a gas pipeline 15 with an adjustable opening and a damper pipeline 16 with an adjustable opening; the temperature of the gas combustion chamber is controlled at 800°C to 860°C; when the temperature reaches 850°C to 860°C, the gas pipeline opening and the damper pipeline opening are reduced; when the temperature reaches 800°C to 810°C, the gas pipeline opening and the damper pipeline opening are restored.

[0028] A tunnel kiln roasting device for carbon block materials, wherein 30 to 60 workstations are arranged in the tunnel kiln roasting chamber, each workstation is 0.5 to 4 meters long, and the carbon block material blanks stay in each workstation for 1 hour to 5 hours; the length of the heating chamber is 14 to 28 workstations, the length of the holding chamber is 8 to 16 workstations, and the length of the cooling chamber is 8 to 16 workstations; at least four flue gas return ducts 5 are connected to the front of the heating chamber 2; at least four first flue gas output ducts 6 are connected to the rear of the heating chamber 2.

[0029] Embodiment 2: A method for roasting carbon block materials in a tunnel kiln, comprising: The asphalt-impregnated carbon block material blank is fed into the tunnel kiln entrance and moves through the tunnel kiln at a uniform speed for roasting; The tunnel kiln is divided into a heating section, a holding section, and a cooling section in sequence; the length of the tunnel kiln is set to 30 meters; the length of the heating section is 14 meters, the length of the holding section is 8 meters, and the length of the cooling section is 8 meters.

[0030] Along the moving direction of the carbon block material blank, the temperature of the heating section gradually increases from 350℃~430℃ at the entrance to 700℃~750℃ from front to back, and the temperature of the holding section gradually decreases from 700℃~750℃ to 550℃~600℃ from front to back; the temperature of the cooling section gradually decreases from 550℃~600℃ to 250℃~300℃ at the exit.

[0031] The carbon block material blank can be placed on a 1-meter-long work vehicle and moved once an hour, 1 meter at a time; the time taken for the carbon block material blank to move in the heating section is 14 hours, the time taken for the carbon block material blank to move in the holding section is 8 hours, and the time taken for the carbon block material blank to move in the cooling section is 8 hours.

[0032] The flue gas flow in the heating section flows from the high temperature to the low temperature. At the entrance of the tunnel kiln, that is, at the low temperature of the tunnel kiln heating section, the flue gas is extracted by an exhaust device and sent to the combustion chamber of the tunnel kiln to fully burn the volatile matter in the flue gas. The fully burned flue gas is recirculated into the tunnel kiln to form the first flue gas cycle. The flue gas flow in the cooling section flows from the low temperature end to the high temperature end. The flue gas is extracted and cooled near the high temperature end. The cooled flue gas is sent to the low temperature end to form the second flue gas cycle.

[0033] The combustion chamber is connected with a gas pipeline with adjustable opening and a damper pipeline with adjustable opening; when the temperature reaches 850℃, the gas pipeline opening and the damper pipeline opening are reduced; when the temperature reaches 800℃, the gas pipeline opening and the damper pipeline opening are restored. Through the above repeated large and small fire control, gas consumption is reduced while achieving full combustion of high-temperature volatile smoke.

[0034] Embodiment 3: A method for roasting carbon block materials in a tunnel kiln, comprising: The asphalt-impregnated carbon block material blank is fed into the tunnel kiln entrance and moves through the tunnel kiln at a uniform speed for roasting; The tunnel kiln is divided into a heating section, a holding section, and a cooling section in sequence; the length of the tunnel kiln is set to 120 meters; the length of the heating section is 56 meters, the length of the holding section is 32 meters, and the length of the cooling section is 32 meters.

[0035] Along the moving direction of the carbon block material blank, the temperature of the heating section gradually increases from 400℃~450℃ to 730℃~780℃, the temperature of the holding section gradually decreases from 730℃~780℃ to 580℃~630℃; the temperature of the cooling section gradually decreases from 580℃~630℃ to 280℃~330℃.

[0036] The time taken for the carbon block material blank to move in the temperature rising section is 140 hours, the time taken for the carbon block material blank to move in the holding section is 80 hours, and the time taken for the carbon block material blank to move in the temperature falling section is 80 hours.

[0037] The flue gas flow in the heating section flows from the high temperature to the low temperature. At the entrance of the tunnel kiln, which is the low temperature of the tunnel kiln heating section, the flue gas is extracted by an exhaust device and sent to the combustion chamber of the tunnel kiln to fully burn the volatiles in the flue gas. The fully burned flue gas is recirculated into the tunnel kiln to form the first flue gas cycle. The flue gas flow in the cooling section flows from the low temperature end near the tunnel kiln outlet to the high temperature end near the holding section. The flue gas is extracted near the high temperature end of the cooling section and sent to the heat exchanger for cooling. The cooled flue gas flows to the low temperature end of the cooling section to form the second flue gas cycle.

[0038] The combustion chamber is connected with a gas pipeline with adjustable opening and a damper pipeline with adjustable opening; when the temperature reaches 860℃, the gas pipeline opening and the damper pipeline opening are reduced; when the temperature reaches 810℃, the gas pipeline opening and the damper pipeline opening are restored. Through the above repeated large and small fire control, gas consumption is reduced while achieving full combustion of high-temperature volatile smoke.

[0039] Embodiment 4: A method for roasting carbon block materials in a tunnel kiln, comprising: The asphalt-impregnated carbon block material blank is fed into the tunnel kiln entrance and moves through the tunnel kiln at a uniform speed for roasting; The tunnel kiln is divided into a heating section, a holding section, and a cooling section in sequence; the length of the tunnel kiln is set to 75 meters; the length of the heating section is 35 meters, the length of the holding section is 20 meters, and the length of the cooling section is 20 meters.

[0040] Along the moving direction of the carbon block material blank, the temperature of the heating section increases from 430℃~480℃ at the entrance to 750℃~800℃ near the holding section. The temperature of the holding section increases from 750℃~800℃ near the heating section to 600℃~650℃ near the cooling section. The temperature of the cooling section increases from 600℃~650℃ near the holding section to 300℃~350℃ at the exit.

[0041] The time taken for the carbon block material blank to move in the temperature rising section is 70 hours, the time taken for the carbon block material blank to move in the holding section is 40 hours, and the time taken for the carbon block material blank to move in the temperature falling section is 40 hours.

[0042] The flue gas flow in the heating section flows from the high temperature area near the holding section to the low temperature area near the entrance of the tunnel kiln; the flue gas is extracted near the low temperature area and sent to the tunnel kiln combustion chamber. The flue gas fully burned in the tunnel kiln combustion chamber flows to the high temperature area and recirculates into the tunnel kiln to form the first flue gas cycle; the flue gas flow in the cooling section flows from the low temperature end near the tunnel kiln outlet to the high temperature end near the holding section. The flue gas is extracted near the high temperature end of the cooling section and sent to the heat exchanger for cooling. The cooled flue gas flows to the low temperature end of the cooling section to form the second flue gas cycle.

[0043] The combustion chamber is connected with a gas pipeline with adjustable opening and a damper pipeline with adjustable opening; when the temperature reaches 855℃, the gas pipeline opening and the damper pipeline opening are reduced; when the temperature reaches 805℃, the gas pipeline opening and the damper pipeline opening are restored. Through the above repeated large and small fire control, gas consumption is reduced while achieving full combustion of high-temperature volatile smoke.

[0044] Embodiment 5: A method for roasting carbon block materials in a tunnel kiln, comprising: The asphalt-impregnated carbon block material is fed into the tunnel kiln entrance and moved at a uniform speed through the tunnel kiln for roasting; the tunnel kiln is divided into a heating section, a holding section, and a cooling section in sequence; the length of the tunnel kiln is 30 to 120 meters.

[0045] The asphalt-impregnated carbon block material blank takes 14 to 140 hours to move in the heating section, 8 to 80 hours to move in the holding section, and 8 to 80 hours to move in the cooling section.

[0046] Along the moving direction of the carbon block material blank, the temperature of the heating section gradually rises from 350℃~480℃ to 700℃~800℃ from front to back, and the length of the heating section is 14~56 meters; the flue gas flow in the heating section flows from the high temperature near the holding section to the low temperature near the entrance of the tunnel kiln; the flue gas is extracted near the low temperature and sent to the tunnel kiln combustion chamber, and the flue gas after full combustion in the tunnel kiln combustion chamber flows to the high temperature to form the first flue gas cycle; the combustion temperature of the combustion chamber is repeatedly circulated between 800℃~860℃. Compared with the previous combustion chamber using a constant temperature combustion method, it is impossible to fully burn the asphalt volatiles in the flue gas, and black smoke is discharged from the exhaust pipe, which is highly polluting. Due to the incomplete combustion, the volatiles will be enriched during the flue gas circulation process, and the inlet temperature of the heating section is greater than 450℃, and the factory has experienced several carbon block material blank fire accidents.

[0047] Along the moving direction of the carbon block material blank, the temperature of the holding section is gradually reduced from 700℃~800℃ to 550℃~650℃ from front to back, and the length of the holding section is 8~32 meters; Along the moving direction of the carbon block material blank, the temperature of the cooling section gradually decreases from 550℃~650℃ to 250℃~350℃ from front to back, and the length of the cooling section is 8~32 meters; the flue gas flow in the cooling section flows from the low-temperature end near the tunnel kiln outlet to the high-temperature end near the holding section. The flue gas is extracted near the high-temperature end of the cooling section and sent to the heat exchanger for cooling. The cooled flue gas flows to the low-temperature end of the cooling section, forming the second flue gas cycle.

[0048] By forming the first flue gas cycle and the second flue gas cycle, and forming a relatively flat flue gas space between the first flue gas cycle and the second flue gas cycle, it can effectively promote the circulation of asphalt volatiles at high temperature to the combustion chamber, greatly reduce the enrichment of high-temperature volatile flue gas, and ensure safety. Compared with the previous tunnel kiln, there is no holding section and cooling section to form the second flue gas cycle; there is a risk of volatile flue gas entering the cooling section, and the carbon block material billet catching fire after the volatile flue gas is enriched.

[0049] The series of detailed descriptions listed above are only specific descriptions of feasible embodiments of the present invention. They are not intended to limit the scope of protection of the present invention. All equivalent embodiments or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for roasting carbon block materials in a tunnel kiln, characterized in that include: The asphalt-impregnated carbon block material is fed into the tunnel kiln entrance and moves through the tunnel kiln at a constant speed for roasting; The tunnel kiln is divided into the heating section, the holding section, and the cooling section in sequence; Along the moving direction of the carbon block material blank, the temperature of the heating section is gradually increased from 350°C to 480°C to 700°C to 800°C, and the temperature of the holding section is gradually decreased from 700°C to 800°C to 550°C to 650°C. The temperature of the cooling section is gradually reduced from 550°C to 650°C to 250°C to 350°C; The flue gas flow in the temperature rising section flows from the high temperature to the low temperature; the flue gas is extracted near the low temperature and sent into the tunnel kiln combustion chamber, and the flue gas after combustion in the tunnel kiln combustion chamber flows to the high temperature to form a first flue gas circulation.

2. A method for roasting carbon block materials in a tunnel kiln according to claim 1, characterized in that: The flue gas flow in the cooling section flows from the low-temperature end to the high-temperature end, the flue gas is drawn away near the high-temperature end for cooling, and the cooled flue gas flows to the low-temperature end, forming a second flue gas cycle.

3. The method for roasting carbon block materials in a tunnel kiln according to claim 1, characterized in that: The combustion temperature in the tunnel kiln combustion chamber cycles repeatedly between 800°C and 860°C.

4. The method for roasting carbon block materials in a tunnel kiln according to claim 1, characterized in that: The length of the tunnel kiln is 30 to 120 meters; the length of the heating section is 14 to 56 meters, the length of the holding section is 8 to 32 meters, and the length of the cooling section is 8 to 32 meters.

5. The method for roasting carbon block materials in a tunnel kiln according to claim 1, characterized in that: The time taken for the carbon block material blank to move in the temperature rising section is 14 to 140 hours. The carbon block material blank moves in the holding section for 8 to 80 hours. The time taken for the carbon block material blank to move in the temperature reduction section is 8 to 80 hours.

6. A carbon block material tunnel kiln roasting device, characterized in that: include: The gas combustion chamber is used to burn the gas to generate high-temperature flue gas and burn the volatile matter generated by the carbon block material blank; The baking chamber is used to place the carbon block material blanks, and the baking chamber is divided into a rising chamber, a holding chamber, and a cooling chamber; The front half of the heating chamber is provided with a flue gas return pipe, and the flue gas return pipe is connected to the gas combustion chamber; The rear half of the heating chamber is provided with a first smoke output pipe, the holding chamber is provided with a second smoke output pipe, and the gas combustion chamber is connected to the first smoke output pipe and the second smoke output pipe; The front half of the cooling chamber is provided with a flue gas cooling pipe, and the rear half of the cooling chamber is provided with a low-temperature flue gas pipe. The flue gas cooling pipe is connected to a heat exchanger, and the heat exchanger is connected to the low-temperature flue gas pipe.

7. A carbon block material tunnel kiln roasting device according to claim 6, characterized in that: The tunnel kiln roasting chamber is provided with 30 to 60 working positions, each of which is 0.5 to 4 meters long, and the carbon block material blank stays in each working position for 1 to 5 hours; The length of the heating chamber is 14 to 28 working positions, the length of the holding chamber is 8 to 16 working positions, and the length of the cooling chamber is 8 to 16 working positions.

8. The carbon block material tunnel kiln roasting device according to claim 6, characterized in that: The first smoke output pipe and the second smoke output pipe are both connected with an opening adjustment device.

9. A carbon block material tunnel kiln roasting device according to claim 7, characterized in that: During operation, the first smoke output duct closest to the holding chamber is at its maximum opening.

10. A carbon block material tunnel kiln roasting device according to claim 6, characterized in that: The gas combustion chamber is connected to a gas pipeline with adjustable opening and a damper pipeline with adjustable opening; the temperature of the gas combustion chamber is controlled at 800°C to 860°C; When the temperature reaches 850℃~860℃, reduce the gas pipeline opening and the damper pipeline opening; When the temperature reaches 800℃~810℃, restore the gas pipeline opening and the damper pipeline opening.

Images