Electrically heated carbon roasting apparatus free of harmful gases and with zero carbon emissions

Abstract

The present invention relates to the field of carbon, and provides an electrically heated carbon roasting apparatus free of harmful gases and with zero carbon emissions, comprising metal material heating bodies. A carbon green product is placed between the metal material heating bodies; a metal material is energized to generate heat, so as to roast the carbon green product; the carbon green product is a carbon molded blank containing a binder such as pitch, a negative electrode powder containing volatile gases, and a carbonaceous material requiring dry distillation and carbonization; and after a filler is added between the metal material heating bodies and the carbon green product, the metal material is energized to generate heat, and the filler and the carbon product material are heated to 600°C-1200°C by means of conduction. The present invention uses clean electricity to heat the carbon product and the filler between the metal material heating bodies by means of the uniform heating of the metal material heating bodies. In this process, the emitted volatile gases are not diluted by combustion exhaust gas, so that the treatment is simple and recycling is possible.

Description

A carbon electric heating calcination equipment with no harmful gases and zero carbon emissions Technical Field

[0001] This invention belongs to the field of carbon products, specifically a carbon electrothermal roasting equipment with no harmful gases and zero carbon emissions. Background Technology

[0002] With the increasing proportion of renewable energy sources such as wind power, photovoltaics, and hydropower, expanding the use of green electricity in industrial production is a major measure to implement the "dual-carbon" strategy.

[0003] The main equipment technologies for roasting, one of the four major processes in carbon product manufacturing—forming, roasting, graphitization, and machining—currently include: covered ring roasting furnaces, open roasting furnaces, car-bottom roasting furnaces, and tunnel kilns. Although their structures differ, they all use fuel gas combustion as a heat source. This not only results in large CO2 emissions, but also the emission of 7-9% of the carbon products' volatile matter during roasting. These volatile matter includes asphalt fumes, benzo[a]pyrene, particulate matter, nitrogen oxides, and SO2, which are discharged along with the combustion exhaust gas, increasing the difficulty of environmental governance. Even after treatment to meet standards, the exhaust gas still needs to be discharged at high altitude through chimneys. Developing new roasting equipment using green electricity is a call for new quality productivity.

[0004] The dry distillation, carbonization processes, and waste gas treatment of other carbon products are basically similar to the roasting process described above.

[0005] To address these issues, the inventors have proposed a carbon electrothermal roasting equipment that produces no harmful gases and has zero carbon emissions.

[0006] Summary of the Invention

[0007] To address the aforementioned technical problems, this invention provides a carbon electrothermal calcination equipment that produces no harmful gases and emits zero carbon emissions, thereby resolving the issues present in the prior art.

[0008] A carbon electric heating roasting equipment with no harmful gases and zero carbon emissions includes an electric current passing through a metal heating element to heat it up, thereby realizing the roasting process of carbon raw products placed therein.

[0009] Preferably, a filler is added between the metal heating element and the carbon product. The metal material generates heat when energized, and the filler and carbon product are heated through conduction to reach 600-1200°C.

[0010] Preferably, the carbon raw materials are carbon molding blanks containing binders, negative electrode powders containing volatile gases, and carbonaceous materials that require dry distillation and carbonization.

[0011] Preferably, the shape of the metal heating element can be varied according to the needs of the carbon product being heated.

[0012] Preferably, a tubular pyrolysis cooling device is fixed on the metal material heating element.

[0013] Preferably, power can be supplied to a single metal heating element; or power can be supplied to multiple metal heating elements connected end to end to form a series circuit; or the series circuit can be set up in parallel according to production capacity requirements.

[0014] Preferably, the roasting equipment also includes a pyrolysis cooling device, a gas collection and dispersion channel, a cooling, dust removal and dehydration device, a gas boiler, an internal combustion engine, an industrial furnace and other gas-using devices.

[0015] Preferably, there is no chimney required for the emission of combustion exhaust gases and volatile gases generated by heating the carbonization chamber with combustion gases.

[0016] Preferably, the roasting equipment includes a power supply device consisting of a transformer, a flexible power supply, a rectifier cabinet, a busbar, and flexible connections.

[0017] Preferably, the volatile gases generated during the roasting process are burned by a gas-using device to release CO2, and then pass through a denitrification device to achieve ultra-low emissions. Alternatively, the emissions can be catalytically hydrogenated to produce compounds such as methanol, formic acid, ethanol, and acetic acid, achieving zero carbon emissions.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] 1. This invention uses an electric current to uniformly heat carbon products and fillers through a metal heating element. The volatile gases emitted during this process are not diluted by combustion exhaust gases, making them not only easy to treat but also recyclable.

[0020] 2. The volatile gases emitted during roasting are discharged after cracking and cooling without any harmful solid, liquid, or gaseous substances such as asphalt fumes, benzo[a]pyrene, tar, or particulate matter.

[0021] 3. The absence of combustion exhaust gases, coupled with improved thermal efficiency and reduced energy consumption, contributes to the dual-carbon strategy.

[0022] 4. The main components of the gas discharged after cracking are carbon monoxide, methane, hydrogen, etc. After being burned by the gas-using equipment, relatively pure carbon dioxide is generated. Then, it is catalytically hydrogenated to produce compounds such as methanol, ethanol, formic acid, and acetic acid, thus achieving zero carbon emissions from the carbon roasting furnace. Attached Figure Description

[0023] Figures 1 and 2 are schematic diagrams of the structure of Embodiment 1 of the present invention;

[0024] Figures 3 and 4 are schematic diagrams of the structure of Embodiment 2 of the present invention;

[0025] In the figure: 1. Rectifier furnace transformer and rectifier cabinet; 2. Positive busbar; 3. Negative busbar; 4. Heating element made of metal material; 5. Filler; 6. Carbon product; 7. Pyrolysis cooling device; 8. Gas collection hood; 9. Gas collection and dispersion channel; 10. Flue gas pipeline; 11. Temperature reduction, dust removal and dehydration device; 12. Centrifugal fan; 13. Gas-using device Specific implementation manner

[0026] The following further describes the implementation manner of the present invention in detail in conjunction with the accompanying drawings and embodiments. The following embodiments are used to describe the present invention, but cannot be used to limit the scope of the present invention.

[0027] Embodiment 1: As shown in Figure 1, the present invention provides a carbon electrothermal baking equipment without harmful gases and zero carbon emissions, including a heating element 4 made of metal material. Carbon green products 6 are placed between the heating elements 4 made of metal material. The metal material is electrified to generate heat, so as to realize the baking of the carbon green products 6. The carbon green products 6 are carbon forming billets containing binders such as asphalt, negative electrode powder containing volatile gases, and carbonaceous materials that need to be dry-distilled and carbonized. Fillers 5 such as negative electrode materials that need to be added are added between the heating elements 4 made of metal material. Then, the metal material is electrified to generate heat, and the filler 5 and the carbon product 6 are heated by conduction to reach 600-1200 °C. A tubular pyrolysis cooling device 7 is fixed on the heating element 4 made of metal material. 58 heating elements 5 made of metal material are connected end to end to form a series circuit and are connected to the power supply device for power transmission. The power supply device can be fixed or movable. In this case, it is a fixed type. When the pyrolysis cooling device 7 is at a high temperature, it receives the volatile gases generated by another group of furnaces and is sent to its bottom through the gas collection and dispersion channel 9. During the rising process of the gas, pyrolysis occurs at a high temperature to generate small molecule combustible gases with a relatively narrow range. Under the seal of the gas collection hood 8, it is discharged through the flue gas pipe 10 and enters the gas-using device 13 after being purified by the temperature reduction, dust removal and dehydration device 11. The CO2 discharged after the combustion of the gas-using device 13 realizes ultra-low emission after passing through the denitration device.

[0028] Embodiment 2: As shown in Figure 2: The present invention provides a carbon electrothermal roasting equipment without harmful gases and zero carbon emissions, including a metal material heating body 4. The metal material heating body 4 is cylindrical, and carbon green products 6 are placed inside. Electricity is applied to the metal material to make it heat up, so as to realize the roasting of the carbon green products 6. The carbon green products 6 are carbon forming billets containing binders such as pitch, negative electrode powders containing volatile gases, and carbonaceous materials that need to be dry-distilled and carbonized. Fillers 5 such as negative electrode materials are added between the cylindrical metal material heating body 4 and the carbon green products 6. Then, electricity is applied to the metal material to make it heat up. Through conduction, the filler 5 and the carbon products 6 are heated to 600-1200 °C. The shape of the cylindrical metal material heating body 4 can be changed according to the needs of the carbon products 6 to be heated. The cylindrical metal material heating body 4 is preferably arranged in an equilateral triangle with 38 cylinders connected up and down to form a series circuit and connected to the power supply device. The power supply device can be fixed or movable. In this case, it is fixed. The outer triangular-like area of the equilateral triangle arrangement is a cracking and cooling device 7. When it is at a high temperature, it receives the volatile gases generated by another group of furnaces and is sent to its bottom through the gas collection and dispersion channel 9. During the upward movement of the gas, it undergoes cracking at high temperature to generate small molecule combustible gases with a relatively narrow range, which are discharged through the flue gas pipe 10 and enter the gas-using device 13 after being purified by the temperature reduction, dust removal, and dehydration device 11. The CO2 discharged after the combustion of the gas-using device 13 realizes ultra-low emissions after passing through the denitration device.

[0029] The power supply unit is directly supplied with power by the rectifier furnace transformer and the rectifier cabinet 1, and is composed of the positive busbar 2 and the negative busbar 3 to supply power to the series circuit composed of the metal material heating body 4. When current passes through the metal material heating body 4, it generates resistive heat following the Q = I 2 Rt law. A series circuit is composed of the metal material heating body 4, and its purpose is to increase the load voltage and reduce the current, making the load circuit more reasonable. According to the production capacity, multiple groups of power supply units can be successively incorporated, and through the reasonable combination of series and parallel connections, the production capacity load is made more balanced.

[0030] The carbon products 4 and the filler 5 installed in the cylindrical metal material heating body 4 will heat up when the power supply unit supplies power and the current flows through. After continuous heating for 300-800 hours, it is heated to 600-1200 °C according to the different uses of the products. After power-off, the gas collection hood 8 is opened, and the temperature is reduced to below 300 °C through the chimney effect of the cracking and cooling device 7, and then taken out.

[0031] Volatile gas utilization unit. The volatile gas discharged during the roasting process of the product is collected by the gas collecting hood 8, enters the gas collecting and dispersing channel 9 of the power-off high-temperature furnace through a branch of the flue gas pipe 10, and then is sent to the bottom of the furnace. During the upward process of the gas, the small molecule combustible gas with a relatively narrow discharge range after high-temperature cracking is collected again by the gas collecting hood 8 of the power-off high-temperature furnace, enters the cooling, dust removal and dehydration device through the flue gas pipe 10, and the purified gas enters the gas using device 13 through the centrifugal fan 12, realizing ultra-low emission. In addition, since the gas in the gas collecting hood 8 is combustible gas, pipeline relief purge valves and pipeline switching valves need to be installed on the pipeline to ensure the safety of operation and maintenance.

[0032] The embodiments of the present invention are given for the purposes of illustration and description. Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limitations of the present invention. Those of ordinary skill in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without affecting the claims of the present invention.

[0033] In the attached drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. Without conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0034] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments or perform equivalent substitution on some of the technical features. Any modification, equivalent substitution, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A carbon electric heating roasting equipment without harmful gas and zero carbon emission, characterized in that: An electric current passes through a metal heating element (4) to heat it up, thereby achieving the roasting process of the carbon raw material (6) placed therein. ​ 2. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 1, characterized in that: A filler (5) is added between the metal heating element (4) and the carbon product (6). The metal material is energized and heated, and the filler (5) and carbon product (6) are heated through conduction to reach 600-1200℃.

3. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 1, characterized in that: The carbon raw materials (6) are carbon molding blanks containing binders, negative electrode powders containing volatile gases, and carbonaceous materials that require dry distillation and carbonization.

4. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 1, characterized in that: The shape of the metal heating element (4) can be changed according to the needs of the carbon product (6) being heated.

5. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 4, characterized in that: A tubular pyrolysis cooling device (7) is fixed on the metal material heating element (4).

6. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 5, characterized in that: It can supply power to a single metal heating element (4); it can also supply power to multiple metal heating elements (4) connected end to end to form a series circuit; and it can also set up the series circuit in parallel according to the production capacity requirements.

7. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 1, characterized in that: The roasting equipment also includes a pyrolysis cooling device (7), a gas collection and dispersion channel (9), a cooling, dust removal and dehydration device (11), and gas-using devices such as a gas boiler, an internal combustion engine, and an industrial furnace (13).

8. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 1, characterized in that: There is no chimney required to emit combustion exhaust gases and volatile gases generated by heating the carbonization chamber with combustion gases.

9. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 1, characterized in that: The roasting equipment includes a power supply device consisting of a transformer, flexible power supply, rectifier cabinet, busbar, flexible connection, etc.

10. The carbon electric heat roasting equipment without harmful gas and zero carbon emission according to claim 7, characterized in that: The volatile gases generated during the roasting process are discharged as CO2 after being burned by the gas-using device (13). After passing through the denitrification device, ultra-low emissions are achieved. Alternatively, the emissions can be catalytically hydrogenated to produce compounds such as methanol, formic acid, ethanol, and acetic acid, achieving zero carbon emissions.

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