A system and method for preparing light oil using pyrolysis gas from a coke oven

Abstract

The present invention provides a system and method for preparing light oil by using pyrolysis gas from a coke oven. The system includes a reforming furnace and a solid-liquid separation device connected to each other. The reforming furnace includes a first cooling section, a hydro-reforming section, and a second cooling section connected in sequence. The first cooling section has a pyrolysis gas inlet, which is connected to the pyrolysis gas outlet of the coke oven. A first cooling device is provided in the first cooling section; the hydro-reforming section has a hydrogen inlet and a red mud inlet, and a temperature adjustment device and a stirring device are provided in the hydro-reforming section; the second cooling section has a solid-liquid outlet and a gas outlet, the gas outlet is connected to a secondary combustion furnace, and a second cooling device is provided in the second cooling section; the solid-liquid separation device has a light oil outlet, and the solid-liquid outlet is connected to the solid-liquid separation device. This application can use the coal tar in the pyrolysis gas to prepare light oil, improve the utilization rate of the pyrolysis gas, and the prepared light oil can be used to produce light fuels such as light gasoline and diesel.

Description

Technical Field

[0001] The present invention relates to the field of light oil preparation, and particularly to a system and method for preparing light oil by using pyrolysis gas of a coke oven. Background Art

[0002] The one-step coke oven is divided into a carbonization section and an activation section. Using coal as raw material, the coal goes through carbonization and activation processes successively to generate activated coke. Carbonization is carried out under the condition of isolating air, and the volatile components in the raw material are separated out by heating to be converted into carbonized material. In the activation furnace, the carbonized material is passed with water vapor as the activation medium to carry out an activation reaction with the carbonized material to generate activated carbon or activated coke. A large amount of pyrolysis gas is generated during the carbonization process, and the components of the pyrolysis gas include H2, CO, hydrocarbons, coal tar, etc. In the prior art, usually the pyrolysis gas is introduced into a secondary combustion furnace for combustion to make full use of the combustible gas in the pyrolysis gas. However, the content of combustible gas in the pyrolysis gas is not high, and there is also a large amount of macromolecular coal tar that cannot be fully utilized by combustion. If the pyrolysis gas is directly burned, the utilization rate of the pyrolysis gas will be reduced. Summary of the Invention

[0003] The present invention aims to solve at least one of the technical problems in the related art to some extent. For this purpose, an embodiment of the present invention provides a system for preparing light oil by using pyrolysis gas of a coke oven, which can use the coal tar in the pyrolysis gas to prepare light oil and improve the utilization rate of the pyrolysis gas.

[0004] An embodiment of the present invention also provides a method for preparing light oil by using pyrolysis gas of a coke oven.

[0005] The system for preparing light oil by using pyrolysis gas of a coke oven according to the embodiment of the present invention includes a reforming furnace and a solid-liquid separation device connected to each other. The reforming furnace includes: a first cooling section, a hydro-reforming section, and a second cooling section. The first cooling section has a first furnace chamber, the first furnace chamber has a pyrolysis gas inlet and a first outlet, the pyrolysis gas inlet is connected to the pyrolysis gas outlet of the coke oven, and a first cooling device is provided in the first furnace chamber; the hydro-reforming section has a second furnace chamber, the second furnace chamber is connected to the first furnace chamber through the first outlet, the second furnace chamber has a hydrogen inlet, a red mud inlet, and a second outlet, and a temperature regulating device and a stirring device are provided in the second furnace chamber; the second cooling section has a third furnace chamber, the third furnace chamber is connected to the second furnace chamber through the second outlet, the third furnace chamber has a solid-liquid outlet and a gas outlet, the gas outlet is connected to a secondary combustion furnace, and a second cooling device is provided in the third furnace chamber; the solid-liquid separation device has a light oil outlet, and the solid-liquid outlet is connected to the solid-liquid separation device.

[0006] By providing a reforming furnace and a solid-liquid separation device, this application can utilize the coal tar in the pyrolysis gas to produce light oil, improving the utilization rate of the pyrolysis gas. The produced light oil can be used to produce light fuels such as light gasoline and diesel. The remaining gas of the pyrolysis gas is introduced into a secondary combustion furnace for combustion and heat release, improving the energy utilization efficiency.

[0007] By providing a red mud inlet in the hydro-reforming section and introducing red mud into the furnace cavity as a catalyst to participate in the hydrocracking reaction, this application can improve the reaction efficiency. Moreover, it is conducive to the resource utilization of industrial solid waste and reduces costs.

[0008] In some embodiments, the solid-liquid separation device includes a filtering device and a centrifugal device connected to each other. The filtering device has a filtrate outlet, and the filtering device is connected to a solid-liquid outlet; the centrifugal device has a light oil outlet, and the centrifugal device is connected to the filtrate outlet.

[0009] This application can remove large particulate impurities such as red mud in the crude light oil product through the filtering device, and can remove quinoline insoluble substances generated during the pyrolysis process through the centrifugal device.

[0010] In some embodiments, the system for producing light oil using the pyrolysis gas of a coke oven further includes a heat exchanger and a high-temperature steam generator. The heat exchanger has a tube-side inlet, a tube-side outlet, and a shell-side inlet. The tube-side inlet is connected to the cooling water pipe of the coke oven, the tube-side outlet is connected to the high-temperature steam generator, and the secondary combustion furnace has a hot gas outlet, and the hot gas outlet is connected to the shell-side inlet.

[0011] This application uses the heat generated by the secondary combustion furnace to heat the cooling water. The heated cooling water is then introduced into the high-temperature steam generator to produce high-temperature steam, and the high-temperature steam is then introduced into the coke oven for activation of the carbonized material, enabling the recycling of energy.

[0012] In some embodiments, the temperature adjustment device includes a microwave heating device and an external heating device.

[0013] This application adjusts the temperature of the hydro-reforming section in a coordinated manner using microwave heating and external heating, which can make the materials in the hydro-reforming section heat up faster and more evenly, and the microwave can assist in the catalytic cracking effect. The red mud used can also act as a wave absorber to improve the microwave-assisted catalytic cracking effect.

[0014] A method for preparing light oil by using the pyrolysis gas of a coke oven, which uses the system for preparing light oil by using the pyrolysis gas of a coke oven as described above, includes the following steps: introducing the pyrolysis gas discharged from the coke oven into the first furnace cavity of a reforming furnace for cooling to obtain coal tar and residual gas; introducing the coal tar and the residual gas into the second furnace cavity, introducing red mud and hydrogen into the second furnace cavity, and performing temperature control and stirring to cause the coal tar to undergo a hydrocracking reaction to obtain a crude light oil product and residual gas; introducing the crude light oil product into the third furnace cavity for further cooling, and introducing the residual gas into a secondary combustion furnace for combustion; introducing the cooled crude light oil product into a solid-liquid separation device for solid-liquid separation to obtain a light oil product.

[0015] This application can utilize the coal tar in the pyrolysis gas to prepare light oil, improve the utilization rate of the pyrolysis gas, and the prepared light oil can be used to produce light fuels such as light gasoline and diesel. The residual gas of the pyrolysis gas is introduced into the secondary combustion furnace for combustion to release heat, improving the energy utilization efficiency.

[0016] This application passes red mud as a catalyst into the hydro-reforming section to participate in the hydrocracking reaction, which can improve the reaction efficiency. And it is beneficial to the resource utilization of industrial solid waste and reduces costs.

[0017] In some embodiments, the solid-liquid separation device includes a filtration device and a centrifugation device. The crude light oil product is introduced into the filtration device for filtration to obtain a filtrate, and then the filtrate is introduced into the centrifugation device for centrifugation to obtain a light oil product.

[0018] This application can remove large particulate impurities such as red mud in the crude light oil product through the filtration device, and can remove quinoline insoluble matter generated during the pyrolysis process through the centrifugation device.

[0019] In some embodiments, the hot gas generated after combustion in the secondary combustion furnace is introduced into a heat exchanger to exchange heat with the warm water discharged from the cooling water pipe of the coke oven to obtain hot water, and the hot water is introduced into the high-temperature steam generator to generate water vapor, and the water vapor is introduced into the coke oven for coke making.

[0020] This application uses the heat generated by the secondary combustion furnace to heat the cooling water, and the heated cooling water is then introduced into the high-temperature steam generator to produce high-temperature water vapor, and the high-temperature water vapor is then introduced into the coke oven for the activation of carbonized materials, enabling the recycling of energy.

[0021] In some embodiments, the cooling temperature in the first furnace cavity is 390 - 410 °C.

[0022] The temperature of the pyrolysis gas discharged from the coke oven can reach 500 - 600 °C, and the coal tar is medium and low temperature coal tar, and the coal tar in the pyrolysis gas can be condensed into a liquid state in the first cooling section.

[0023] In some embodiments, the temperature in the second furnace chamber is 240 - 390 °C, and the reaction time of the hydrocracking reaction is 1.5 - 2.5 h. Controlling the temperature of the second furnace chamber at 240 - 390 °C can make the hydrocracking reaction more complete.

[0024] In some embodiments, the temperature in the third furnace chamber is 150 - 200 °C to cool the obtained light oil. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The above and / or additional aspects and advantages of the present invention will become apparent and be readily understood from the following description of the embodiments in conjunction with the drawings.

[0026] Wherein:

[0027] Figure 1 is a schematic structural diagram of a system for preparing light oil using the pyrolysis gas of a coke oven in an embodiment of the present application;

[0028] Reference Numerals:

[0029] 1 - reforming furnace; 2 - first cooling section; 3 - hydroreforming section; 4 - second cooling section; 5 - filtration device; 6 - centrifugation device; 7 - secondary combustion furnace; 8 - heat exchanger; 9 - high - temperature steam generator. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0030] Embodiments of the present invention will be described in detail below. Examples of the embodiments are shown in the drawings. The embodiments described below with reference to the drawings are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

[0031] A system for preparing light oil using the pyrolysis gas of a coke oven according to an embodiment of the present invention will be described below with reference to the drawings.

[0032] As Figure 1 shown, an embodiment of the present application provides a system for preparing light oil using the pyrolysis gas of a coke oven, including a reforming furnace 1 and a solid - liquid separation device connected to each other. The reforming furnace 1 includes: a first cooling section 2, a hydroreforming section 3, and a second cooling section 4. The first cooling section 2 has a first furnace chamber with a pyrolysis gas inlet and a first outlet. The pyrolysis gas inlet is connected to the pyrolysis gas outlet of the coke oven, and a first cooling device is provided in the first furnace chamber; the hydroreforming section 3 has a second furnace chamber connected to the first furnace chamber through the first outlet. The second furnace chamber has a hydrogen inlet, a red mud inlet, and a second outlet, and a temperature regulating device and a stirring device are provided in the second furnace chamber; the second cooling section 4 has a third furnace chamber connected to the second furnace chamber through the second outlet. The third furnace chamber has a solid - liquid outlet and a gas outlet, and the gas outlet is connected to a secondary combustion furnace. A second cooling device is provided in the third furnace chamber; the solid - liquid separation device has a light oil outlet, and the solid - liquid outlet is connected to the solid - liquid separation device.

[0033] In this application, by setting up a reforming furnace 1 and a solid-liquid separation device, the coal tar in the pyrolysis gas can be used to produce light oil, improving the utilization rate of the pyrolysis gas. The produced light oil can be used to produce light fuels such as light gasoline and diesel. The remaining gas of the pyrolysis gas is introduced into a secondary combustion furnace for combustion and heat release, improving the energy utilization efficiency.

[0034] It should be noted that the coal tar in the pyrolysis gas is medium-low temperature coal tar, which has a high liquid-phase yield and a low asphalt content, and is suitable for hydrocracking reactions. Coal tar belongs to heavy oil, and heavy oil is converted into light oil through hydro-reforming.

[0035] In this application, by setting a red mud inlet in the hydro-reforming section 3 and introducing red mud into the furnace cavity as a catalyst to participate in the hydrocracking reaction, the reaction efficiency can be improved. Moreover, it is beneficial to the resource utilization of industrial solid waste and reduces costs.

[0036] Furthermore, the secondary combustion furnace has an air combustion supplement port for introducing the air required for combustion into the secondary combustion furnace.

[0037] Furthermore, the stirring device is used to stir the red mud and coal tar, and hydrogen is introduced at the same time. Through stirring, the gas-liquid-solid mixture is made uniform, promoting the reaction process.

[0038] In some embodiments, the solid-liquid separation device includes a filtering device 5 and a centrifugal device 6 that are connected to each other. The filtering device 5 has a filtrate outlet, and the filtering device 5 is connected to the solid-liquid outlet; the centrifugal device 6 has a light oil outlet, and the centrifugal device 6 is connected to the filtrate outlet.

[0039] In this application, the filtering device 5 can remove large particulate impurities such as red mud in the crude light oil product, and the centrifugal device 6 can remove quinoline insoluble matter generated during the pyrolysis process.

[0040] In some embodiments, the system for preparing light oil using the pyrolysis gas of a coke oven further includes a heat exchanger 8 and a high-temperature steam generator 9. The heat exchanger 8 has a tube-side inlet, a tube-side outlet, and a shell-side inlet. The tube-side inlet is connected to the cooling water pipe of the coke oven, the tube-side outlet is connected to the high-temperature steam generator 9, and the secondary combustion furnace has a hot gas outlet, and the hot gas outlet is connected to the shell-side inlet.

[0041] In this application, the heat generated by the secondary combustion furnace is used to heat the cooling water. The heated cooling water is then introduced into the high-temperature steam generator 9 to produce high-temperature steam, and the high-temperature steam is then introduced into the coke oven for the activation of carbonized materials, enabling the recycling of energy.

[0042] Furthermore, the heat exchanger 8 also has a shell-side outlet, and the shell-side outlet is connected to a flue to discharge the exhausted gas after heat exchange to the power plant flue.

[0043] In some embodiments, the temperature regulating device includes a microwave heating device and an external heating device.

[0044] In this application, the temperature of the hydrogenation reforming section 3 is regulated by the coordinated method of microwave heating and external heating, which can make the material in the hydrogenation reforming section 3 heat up faster and the temperature more uniform. Moreover, the microwave can assist the catalytic cracking effect. The red mud used can also be used as a wave-absorbing agent to improve the effect of microwave-assisted catalytic cracking.

[0045] Microwave heating belongs to the internal heating method and has the characteristic of fast heating and temperature rise. When the microwave heats the material, the temperature field distribution is high temperature inside and low temperature outside; when the external heating method heats the material, the temperature field distribution is high temperature outside and low temperature inside. The coordinated heating of microwave heating and external heating makes the temperature field of the material more uniform, ensures the reaction efficiency of hydrogenation reforming, and improves the quality of the product.

[0046] It should be noted that although the temperature of the hydrogenation reforming section 3 is lower than that of the first cooling section 2, due to the long duration of the hydrocracking reaction in the hydrogenation reforming section 3, the temperature will decrease, and the temperature regulating device is required to control the temperature within a certain range to ensure the reaction temperature required for the hydrocracking reaction.

[0047] In another embodiment of this application, a method for preparing light oil by using the pyrolysis gas of a coke oven is proposed. Using the above-mentioned system for preparing light oil by using the pyrolysis gas of a coke oven, it includes the following steps: passing the pyrolysis gas discharged from the coke oven into the first furnace cavity of the reforming furnace 1 for cooling to obtain coal tar and the remaining gas; passing the coal tar and the remaining gas into the second furnace cavity, introducing red mud and hydrogen into the second furnace cavity and performing temperature control and stirring to make the coal tar undergo a hydrocracking reaction to obtain a light oil crude product and the remaining gas; passing the light oil crude product into the third furnace cavity for further cooling, and passing the remaining gas into the secondary combustion furnace for combustion; passing the cooled light oil crude product into a solid-liquid separation device for solid-liquid separation to obtain a light oil product.

[0048] This application can use the coal tar in the pyrolysis gas to prepare light oil, improve the utilization rate of the pyrolysis gas, and the prepared light oil can be used to produce light fuels such as light gasoline and diesel. Passing the remaining gas of the pyrolysis gas into the secondary combustion furnace for combustion to release heat, improving the energy utilization efficiency.

[0049] In this application, by introducing red mud into the hydrogenation reforming section 3 as a catalyst to participate in the hydrocracking reaction, the reaction efficiency can be improved. Moreover, it is beneficial to the resource utilization of industrial solid waste and reduces costs.

[0050] It should be noted that the main components of red mud are Fe2O3 and Al2O3, and the combination of the two can improve the catalytic ability and cycle characteristics of Fe2O3.

[0051] In some embodiments, the solid-liquid separation device includes a filtration device 5 and a centrifugation device 6. The crude light oil product is passed into the filtration device 5 for filtration to obtain a filtrate, and then the filtrate is passed into the centrifugation device 6 for centrifugation to obtain a light oil product.

[0052] In this application, the filtration device 5 can remove large particulate impurities such as red mud in the crude light oil product, and the centrifugation device 6 can remove quinoline insoluble substances generated during the pyrolysis process.

[0053] In some embodiments, the hot gas generated after combustion in the secondary combustion furnace is passed into the heat exchanger 8 to exchange heat with the warm water discharged from the cooling water pipe of the coke oven to obtain hot water. The hot water is passed into the high-temperature steam generator 9 to generate steam, and the steam is passed into the coke oven for coke making.

[0054] In this application, the heat generated by the secondary combustion furnace is used to heat the cooling water. The heated cooling water is then passed into the high-temperature steam generator 9 to produce high-temperature steam, and the high-temperature steam is then passed into the coke oven for activation of the carbonized material, enabling the recycling of energy.

[0055] In some embodiments, the cooling temperature in the first furnace chamber is 390 - 410 °C, preferably 400 °C. The first cooling device is a cooling water coil, and cooling water is passed into the cooling water coil.

[0056] The temperature of the pyrolysis gas discharged from the coke oven can reach 500 - 600 °C, and the coal tar therein is medium and low-temperature coal tar. The coal tar in the pyrolysis gas can be condensed into a liquid state in the first cooling section 2.

[0057] In some embodiments, the temperature in the second furnace chamber is 240 - 390 °C. Controlling the temperature of the second furnace chamber within 240 - 390 °C can make the hydrocracking reaction more complete.

[0058] In some embodiments, the reaction time of the hydrocracking reaction is 1.5 - 2.5 h, preferably 2 h.

[0059] In some embodiments, the temperature in the third furnace chamber is 150 - 200 °C to cool the obtained light oil. The second cooling device is a cooling water coil, and cooling water is passed into the cooling water coil.

[0060] In some embodiments, industrial solid waste is used as the bed material of the reforming furnace 1, which is beneficial to the resource utilization of industrial solid waste and reduces the overall process cost.

[0061] The following further elaborates on this application through specific embodiments.

[0062] Example 1

[0063] As Figure 1 shown, a method for preparing light oil using the pyrolysis gas of a coke oven includes the following steps:

[0064] S1. Pass the pyrolysis gas discharged from the coking oven into the first cooling section 2 of the reforming furnace 1 to cool it down to 400 °C, obtaining coal tar and the remaining gas.

[0065] S2. Pass the coal tar and the remaining gas into the hydrocracking section, introduce red mud and hydrogen into the hydrocracking section, control the reaction temperature at 300 °C, turn on the stirring device to stir, make the coal tar, red mud and hydrogen mix evenly for full reaction, with the reaction time being 2 h, obtaining a light oil crude product and the remaining gas.

[0066] S3. Pass the light oil crude product into the second cooling section 4 to cool it down to 170 °C, and pass the remaining gas into the secondary combustion furnace for combustion. The hot gas generated after the combustion in the secondary combustion furnace is passed into the heat exchanger 8 to exchange heat with the warm water discharged from the cooling water pipe of the coking oven to obtain hot water, and the hot water is passed into the high-temperature steam generator 9 to generate steam, and the steam is passed into the coking oven for coking.

[0067] S4. Pass the cooled light oil crude product into the filtering device 5 for filtering to remove large particulate impurities such as red mud, obtaining a filtrate, and then pass the filtrate into the centrifugal device 6 for centrifugation to remove quinoline insoluble matter, obtaining a light oil product.

[0068] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present invention.

[0069] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0070] In the present invention, unless otherwise clearly specified or limited, the terms "mounted", "connected", "connected to", "fixed", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection, or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and it may be the internal communication of two components or the interaction relationship between two components, unless otherwise clearly limited. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0071] In the present invention, unless otherwise clearly specified or limited, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "below" and "beneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0072] In the present invention, terms such as "some embodiments" mean that the specific features, structures, materials or characteristics described in connection with the embodiments are included in at least one embodiment of the present invention. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiments. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments and the features of different embodiments described in this specification.

[0073] 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 limiting 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.

Claims

1. A system for preparing light oil using the pyrolysis gas of a coke oven, characterized in that, Comprising a reforming furnace and a solid-liquid separation device connected to each other, the reforming furnace includes: A first cooling section having a first furnace chamber with a pyrolysis gas inlet and a first outlet. The pyrolysis gas inlet is connected to the pyrolysis gas outlet of the coke oven, and a first cooling device is provided in the first furnace chamber; A hydro-reforming section having a second furnace chamber connected to the first furnace chamber through the first outlet. The second furnace chamber has a hydrogen inlet, a red mud inlet, and a second outlet, and a temperature regulating device and a stirring device are provided in the second furnace chamber. The temperature regulating device includes a microwave heating device and an external heating device; A second cooling section having a third furnace chamber connected to the second furnace chamber through the second outlet. The third furnace chamber has a solid-liquid outlet and a gas outlet, and the gas outlet is connected to a secondary combustion furnace. A second cooling device is provided in the third furnace chamber; A heat exchanger and a high-temperature steam generator. The heat exchanger has a tube-side inlet, a tube-side outlet, and a shell-side inlet. The tube-side inlet is connected to the cooling water pipe of the coke oven, the tube-side outlet is connected to the high-temperature steam generator, and the secondary combustion furnace has a hot gas outlet connected to the shell-side inlet; The solid-liquid separation device has a light oil outlet, and the solid-liquid outlet is connected to the solid-liquid separation device.

2. The system for preparing light oil by using the pyrolysis gas of a coke oven according to claim 1, wherein The solid-liquid separation device includes a filtering device and a centrifugal device connected to each other. The filtering device has a filtrate outlet and is connected to the solid-liquid outlet; the centrifugal device has a light oil outlet and is connected to the filtrate outlet.

3. A method for preparing light oil by using pyrolysis gas of a coke oven, characterized in that, Using the system for preparing light oil from the pyrolysis gas of a coke oven according to any one of claims 1-2, comprising the following steps: Introducing the pyrolysis gas discharged from the coke oven into the first furnace chamber of the reforming furnace for cooling to obtain coal tar and residual gas; Introducing the coal tar and the residual gas into the second furnace chamber, introducing red mud and hydrogen into the second furnace chamber, and performing temperature control and stirring to cause the coal tar to undergo a hydrocracking reaction to obtain a crude light oil product and residual gas; Introducing the crude light oil product into the third furnace chamber for further cooling, and introducing the residual gas into the secondary combustion furnace for combustion; Introducing the cooled crude light oil product into the solid-liquid separation device for solid-liquid separation to obtain a light oil product.

4. The method for preparing light oil by using the pyrolysis gas of a coke oven according to claim 3, characterized in that, The solid-liquid separation device includes a filtering device and a centrifugal device. The crude light oil product is introduced into the filtering device for filtration to obtain a filtrate, and then the filtrate is introduced into the centrifugal device for centrifugation to obtain a light oil product.

5. The method for preparing light oil by using the pyrolysis gas of a coke oven according to claim 3, characterized in that, The hot gas generated after the combustion of the secondary combustion furnace is introduced into the heat exchanger to exchange heat with the warm water discharged from the cooling water pipe of the coke oven to obtain hot water, and the hot water is introduced into the high-temperature steam generator to generate steam, and the steam is introduced into the coke oven for coke making.

6. The method for preparing light oil by using the pyrolysis gas of a coke oven according to claim 3, characterized in that, The cooling temperature in the first furnace chamber is 390-410°C.

7. The method for preparing light oil by using the pyrolysis gas of a coke oven according to claim 3, characterized in that, The temperature in the second furnace chamber is 240-390°C, and the reaction time of the hydrocracking reaction is 1.5-2.5 h.

8. The method for preparing light oil by using pyrolysis gas of coke oven according to claim 3, characterized in that, The temperature in the third furnace chamber is 150-200°C.

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