A method and system for dry quenching of coal tar from a carbon product tail gas

Abstract

The embodiment of the application provides a kind of charcoal product tail gas dry method of extinguishing coal tar method and system, in the method, the self-produced tail gas obtained in the processing of target carbon product is handled after cooling, the combustible gas and gaseous coal tar in the exhaust tail gas of the sixth temperature are condensed and separated, realize the separation process of combustible gas and coal tar, obtain the coal tar product in liquid state.It can be seen that the mixed gas generated in the processing of target carbon product is condensed and separated, the medium for separating combustible gas and coal tar in mixed gas is the cooling tail gas after cooling of self-produced tail gas, not other gas outside.Therefore, the method reduces the generation of impurities in the preparation process of coal tar product, and the cooling tail gas after cooling of self-produced tail gas is used for condensing and separating mixed gas, which not only improves the collection efficiency of coal tar in mixed gas and increases the collection amount of coal tar, but also improves the utilization rate of self-produced tail gas.

Description

Technical Field

[0001] This application relates to the field of charcoal product manufacturing technology, specifically to a method for dry quenching coal tar from charcoal product tail gas. This application also relates to a system for dry quenching coal tar from charcoal product tail gas. Background Technology

[0002] The charcoal product generation process involves heating initial lump coal to a preset temperature in an industrial kiln. The volatile components in the initial lump coal decompose into tail gas, leaving behind non-volatile solid charcoal, which is called the target charcoal product. The tail gas obtained from the decomposition of volatile components in the initial lump coal contains coal tar and combustible gas components. In existing technologies, the method for separating the coal tar and combustible gas components in this tail gas to obtain liquid coal tar products typically involves washing and collecting the coal tar product with ammonia water.

[0003] The existing methods for obtaining coal tar products not only require the consumption of large amounts of ammonia water, but also have significant collection difficulties and result in low coal tar collection volumes.

[0004] Therefore, improving the collection method of coal tar in the exhaust gas generated during the heat treatment of charcoal products is a problem that needs to be solved. Summary of the Invention

[0005] This application provides a method for dry quenching coal tar from charcoal product tail gas to improve the utilization rate of tail gas generated during the heat treatment of charcoal products. This application also provides a system for dry quenching coal tar from charcoal product tail gas.

[0006] This application provides a method for dry quenching of coal tar in charcoal product tail gas, comprising: cooling a first target tail gas with a first temperature generated during the processing of a target charcoal product to obtain cooled tail gas; using the cooled tail gas to condense and separate a discharge tail gas with a sixth temperature generated during the processing of the target charcoal product to obtain a liquid coal tar product with a seventh temperature and a second target tail gas with a seventh temperature; storing the second target tail gas in a target charcoal product tail gas storage device, and after standing for a preset time, obtaining the first target tail gas; wherein, the first target tail gas is a combustible gas with a first temperature, the first temperature being room temperature, and the second target tail gas is a combustible gas with a seventh temperature, the seventh temperature being 30°C; the discharge tail gas with the sixth temperature is a mixed gas discharged from the outlet of a heating furnace during the processing of the target charcoal product, the mixed gas including gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature, wherein the first temperature is lower than the sixth temperature, and the seventh temperature is lower than the sixth temperature.

[0007] Optionally, the step of cooling the first target exhaust gas with a first temperature generated during the processing of the target charcoal product to obtain cooled exhaust gas includes: cooling the first target exhaust gas through a gas refrigeration and heating device to obtain cooled exhaust gas with an eighth temperature, wherein the eighth temperature is lower than the first temperature.

[0008] Optionally, the step of using the cooling exhaust gas to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product to obtain a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature includes: using the cooling exhaust gas to perform heat exchange treatment with the exhaust gas with the sixth temperature, and performing condensation and separation treatment on the gaseous coal tar and combustible gas in the exhaust gas with the sixth temperature to obtain a liquid coal tar product with the seventh temperature and a second target exhaust gas with the seventh temperature.

[0009] Optionally, the gas cooling and heating device is a vortex tube; the step of cooling the first target exhaust gas through the gas cooling and heating device to obtain cooled exhaust gas with an eighth temperature includes: separating the first target exhaust gas through the vortex tube into cooled exhaust gas with an eighth temperature and hot gas with a ninth temperature; wherein, the hot gas with the ninth temperature is introduced into the heating stage furnace layer through the air inlet of the heating stage furnace layer, and after heat exchange with the target plasma hot air medium gas, it is used to heat the preheated carbon product to obtain high-temperature exhaust gas with a fourth temperature and high-temperature carbon product with a fourth temperature; the eighth temperature is lower than the first temperature, the first temperature is lower than the ninth temperature, and the ninth temperature is lower than the fourth temperature.

[0010] Optionally, it further includes: obtaining exhaust gas with a sixth temperature generated during the processing of the target charcoal product; obtaining exhaust gas with a sixth temperature generated during the processing of the target charcoal product includes: plasma treatment of the target exhaust gas to obtain a plasma hot air medium gas, the target exhaust gas including the first target exhaust gas and the second target exhaust gas; using the plasma hot air medium gas to provide a heating source during the heating stage of the processing of the target charcoal product, heating the preheated charcoal product to obtain high-temperature exhaust gas with a fourth temperature and a high-temperature charcoal product with a fourth temperature, the fourth temperature being the preparation temperature that meets the preparation conditions of the high-temperature charcoal product; using the high-temperature exhaust gas with the fourth temperature to provide a preheating heat source during the preheating stage of the processing of the target charcoal product, preheating the charcoal raw material product to be processed to obtain a preheated charcoal product and exhaust gas with a sixth temperature; wherein, the sixth temperature is lower than the fourth temperature.

[0011] This application embodiment also provides a dry quenching coal tar system for charcoal product tail gas, comprising: a gas refrigeration and heating device, an oleophobic dust removal device, and a target charcoal product tail gas storage device; the gas refrigeration and heating device is used to cool a first target tail gas with a first temperature generated during the processing of the target charcoal product to obtain a cooled tail gas with an eighth temperature, and the cooled tail gas is provided to the oleophobic dust removal device; the oleophobic dust removal device is used to condense and separate the exhaust tail gas with a sixth temperature generated during the processing of the target charcoal product using the cooled tail gas to obtain a liquid coal tar product with a seventh temperature and a second target tail gas with a seventh temperature, and the second target tail gas is provided to the target charcoal product tail gas storage device; the target charcoal product tail gas storage device... The equipment is used to obtain the second target exhaust gas provided by the oleophobic dust removal equipment, and after standing for a preset time, obtain the first target exhaust gas, and provide the first target exhaust gas to the gas refrigeration and heating equipment; wherein, the first target exhaust gas is a combustible gas with a first temperature, the first temperature being room temperature, and the second target exhaust gas is a combustible gas with a seventh temperature, the seventh temperature being 30°C; the exhaust gas with the sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, the mixed gas including gaseous coal tar with the sixth temperature and combustible gas with the sixth temperature, the eighth temperature being lower than the first temperature and the seventh temperature respectively, the first temperature being lower than the sixth temperature, and the seventh temperature being lower than the sixth temperature.

[0012] Optionally, the oleophobic dust removal equipment is specifically used to perform heat exchange treatment between the cooled exhaust gas and the exhaust gas at the sixth temperature, and to perform condensation and separation treatment on the gaseous coal tar and combustible gas in the exhaust gas at the sixth temperature, so as to obtain a liquid coal tar product at the seventh temperature and a second target exhaust gas at the seventh temperature.

[0013] Optionally, the gas cooling and heating device is a vortex tube; the vortex tube is used to separate the first target exhaust gas into a cooled exhaust gas with an eighth temperature and a hot gas with a ninth temperature, providing the cooled exhaust gas with the eighth temperature to the oleophobic dust removal device, and providing the hot gas with the ninth temperature to the heating furnace; wherein, the hot gas with the ninth temperature is used to be introduced into the heating stage furnace layer through the air inlet of the heating stage furnace layer, and after heat exchange treatment with the target plasma hot air medium gas, it is used to heat the preheated carbon product to obtain the high-temperature exhaust gas with the fourth temperature and the high-temperature carbon product with the fourth temperature; the eighth temperature is lower than the first temperature, the first temperature is lower than the ninth temperature, and the ninth temperature is lower than the fourth temperature.

[0014] Optionally, it further includes: a plasma hot air furnace and a heating furnace; the target charcoal product exhaust gas storage device is further used to provide the first target exhaust gas to the plasma hot air furnace; the oleophobic dust removal device is further used to provide the second target exhaust gas to the plasma hot air furnace; the plasma hot air furnace is used to plasma-treat the target exhaust gas to obtain a plasma hot air medium gas, the target exhaust gas including the first target exhaust gas and the second target exhaust gas; the plasma hot air medium gas is provided to the heating furnace; the heating furnace is used to process the target charcoal product using the plasma hot air medium gas. The heating stage in the process provides a heat source to heat the preheated charcoal product, obtaining high-temperature exhaust gas with a fourth temperature and high-temperature charcoal product with a fourth temperature, wherein the fourth temperature is the preparation temperature that meets the preparation conditions of the high-temperature charcoal product; the high-temperature exhaust gas with the fourth temperature is used as a preheating heat source in the preheating stage of the target charcoal product processing process to preheat the charcoal raw material product to be processed, obtaining preheated charcoal product and exhaust exhaust gas with a sixth temperature; the exhaust exhaust gas with the sixth temperature is discharged through the outlet of the heating furnace and then provided to the oil-repellent dust removal equipment; wherein, the sixth temperature is lower than the fourth temperature.

[0015] Compared with the prior art, the embodiments of this application have the following advantages:

[0016] The dry quenching method for coal tar in charcoal product tail gas provided in this application embodiment involves cooling a first target tail gas generated during the processing of the target charcoal product to obtain cooled tail gas. Then, a sixth-temperature exhaust tail gas generated during the processing of the target charcoal product is subjected to condensation separation treatment to obtain a liquid coal tar product with a seventh temperature and a second target tail gas with a seventh temperature. The sixth-temperature exhaust tail gas is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, comprising gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature. The second target tail gas is stored in a target charcoal product tail gas storage device and allowed to stand for a preset time to obtain the first target tail gas. In this process, the self-generated tail gas obtained during the processing of the target charcoal product is cooled, and then the combustible gas and gaseous coal tar in the sixth-temperature exhaust tail gas are condensed and separated, achieving the separation of combustible gas and coal tar, and obtaining a liquid coal tar product. Therefore, it can be seen that the condensation separation of the mixed gas generated during the processing of the target charcoal products, using cooled tail gas (after cooling the self-produced tail gas) as the medium for separating combustible gases and coal tar from the mixed gas, rather than other external gases, reduces the generation of impurities during the preparation of coal tar products. Using cooled tail gas (after cooling the self-produced tail gas) for condensation separation of the mixed gas not only improves the collection efficiency of coal tar in the mixed gas and increases the amount of coal tar collected, but also enhances the utilization rate of the self-produced tail gas.

[0017] The dry quenching coal tar system for charcoal product tail gas provided in this application includes: a gas refrigeration and heating device, an oleophobic dust removal device, and a target charcoal product tail gas storage device. The gas refrigeration and heating device cools the first target tail gas generated during the processing of the target charcoal product to obtain cooled tail gas. The oleophobic dust removal device condenses and separates the exhaust tail gas with a sixth temperature generated during the processing of the target charcoal product to obtain a liquid coal tar product with a seventh temperature and a second target tail gas with a seventh temperature. The exhaust tail gas with the sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, and the mixed gas includes gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature. The target charcoal product tail gas storage device stores the second target tail gas, and after standing for a preset time, obtains the first target tail gas. In this process, the self-produced tail gas obtained during the processing of the target charcoal product is cooled and then used to condense and separate the combustible gas and gaseous coal tar in the exhaust gas at the sixth temperature. This separation process achieves the separation of combustible gas and coal tar, resulting in a liquid coal tar product. Therefore, it can be seen that the medium for condensing and separating the combustible gas and coal tar in the mixed gas generated during the processing of the target charcoal product is the cooled tail gas obtained from the self-produced tail gas, rather than other external gases. Thus, this method reduces the generation of impurities during the preparation of coal tar products. Using the cooled tail gas obtained from the self-produced tail gas for condensing and separating the mixed gas not only improves the collection efficiency of coal tar in the mixed gas and increases the amount of coal tar collected, but also enhances the utilization rate of the self-produced tail gas. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the semi-coke production process in the prior art. The components include an industrial kiln 101, a blower 102, a tail gas storage device 103, a cooling and coking device 104, a charcoal product storage tank 105, a coal tar storage tank 106, and a cooling and screening device 107.

[0019] Figure 2 This is a schematic diagram of the target charcoal product generation process provided in the embodiments of this application.

[0020] Figure 3 This is a schematic diagram of the structure of the heating furnace provided in an embodiment of this application.

[0021] Among them, there are plasma hot air furnace 201, heating furnace 202, preheating stage furnace layer 202-1 of heating furnace, heating stage furnace layer 202-2 of heating furnace, dry quenching stage furnace layer 202-3 of heating furnace, air outlet of preheating stage furnace layer 202-4, air inlet of heating stage furnace layer 202-5, air inlet of dry quenching stage furnace layer 202-6, carbon outlet of dry quenching stage furnace layer 202-7, oleophobic dust removal equipment 203, target carbon product tail gas storage equipment 204, coal tar product storage equipment 205, target carbon product storage equipment 206, gas refrigeration and heating equipment 207, and compressor 208.

[0022] Figure 4 The flowchart illustrates a method for dry quenching of coal tar from tail gas in charcoal products, as provided in the first embodiment of this application.

[0023] Figure 5 This is a logic framework diagram of a dry quenching coal tar system for charcoal product tail gas provided in the second embodiment of this application. Detailed Implementation

[0024] Many specific details are set forth in the following description to provide a full understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of this application; therefore, this application is not limited to the specific embodiments disclosed below.

[0025] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to limit the application. The descriptive terms used in this application and the appended claims, such as "a," "first," and "second," are not intended to limit quantity or sequence, but rather to distinguish information of the same type from one another.

[0026] Chemical terminology

[0027] Unless otherwise defined, all technical terms herein have the same meaning as commonly understood by one of ordinary skill in the art to which the subject of the claims pertains. If multiple definitions exist for a term herein, the definition provided in this chapter shall prevail.

[0028] First, let me explain the concepts involved in this application:

[0029] Plasma hot air furnace: A device that uses plasma technology to generate high-temperature hot air. In a plasma hot air furnace, gas passes through a discharge region between electrodes to generate plasma, and then the energy of the plasma is converted into heat energy to produce high-temperature hot air.

[0030] Plasma: A high-temperature gaseous state composed of electrons, ions, and neutral particles, typically ranging from 3000°C to 5000°C. In this state, the particles in the gas possess high energy and are highly ionized, forming a fluid similar to a liquid. Plasma can be generated through methods such as electrical discharge, electric arc, and laser, and possesses specific characteristics such as high temperature, high energy, and high electrical conductivity.

[0031] Coke: Obtained by dry distillation of coal at temperatures ranging from 1000℃ to 1300℃. Specifically, when coal is heated to above 350℃ in a furnace, as the temperature gradually increases, the organic matter in the coal decomposes, with volatile products escaping as gases, and the remaining non-volatile products forming coke.

[0032] Semi-coke: also known as semi-coke, it has a blocky structure with a particle size greater than or equal to 30 mm and a light black color. It is carbon formed from the non-volatile components obtained by dry distillation of semi-coke lump coal at a temperature of 550-750℃. The semi-coke lump coal used in this application has a particle size greater than or equal to 30 mm.

[0033] Shaped coke: Coke produced by pressing and molding into uniform shapes. Specifically, it is a new type of coke made by pressing coal powder and other raw materials into shaped pieces, followed by carbonization. The dry distillation temperature of shaped coke is the same as that of regular coke, which is 1000℃~1300℃.

[0034] Dry distillation: The process by which coal undergoes thermal changes under conditions of isolation from air. Coal undergoes complex changes during dry distillation, mainly in terms of its properties. When studying the dry distillation process, it is essential to understand the changes in coal particle size, softening, thermal decomposition, and coking. Coal dry distillation is also known as coal coking.

[0035] Lump raw materials or briquettes: Coal is compressed into lumps or spheres of a predetermined size, with a particle size greater than or equal to 10mm. They are light black in color and characterized by high calorific value, low ash content, low sulfur content, and low nitrogen oxide emissions, making them a clean and efficient energy source. For example, semi-coke and shaped coke can both be made into briquettes. Powdered coal is processed to obtain spherical semi-coke or shaped coke. During the heating process, lump raw materials or briquettes decompose, releasing volatile and non-volatile components.

[0036] Volatile components: also known as volatile matter, are components in the raw material or briquette that can decompose into gaseous and liquid substances during the heating process. They mainly include hydrogen, methane, carbon monoxide, and carbon dioxide.

[0037] Non-volatile components: These are the components in the raw materials or briquettes that cannot be decomposed into gaseous and liquid substances during the heating process. They mainly include elements such as carbon, oxygen, nitrogen, and sulfur.

[0038] During the heating process of raw materials or briquettes, volatile components first decompose from the surface of the raw materials or briquettes, forming gaseous and liquid substances. These volatile components then further decompose, producing more gas. The decomposition process of volatile components is affected by factors such as temperature, time, and pressure, and the decomposition characteristics of volatile components vary depending on the type of coal. Non-volatile components, on the other hand, remain in the raw materials or briquettes, forming the target charcoal product. These non-volatile components affect the calorific value and combustion performance of the target charcoal product.

[0039] If the raw material or briquettes are semi-coke, the volatiles will volatilize when heated to a temperature of 550–750℃. If the raw material or briquettes are molded coke, the volatiles will volatilize when heated to a temperature of 1000–1300℃.

[0040] Cooling gas: Cooled tail gas obtained after cooling the first target tail gas stored in the target charcoal product tail gas storage device. In the embodiments of this application, the first target tail gas stored in the target charcoal product tail gas storage device mainly includes hydrogen and methane, which are volatile gases generated during the production of coke, semi-coke, or shaped coke, and are combustible gases obtained after condensation and separation.

[0041] Before detailing the embodiments of this application, we will first introduce the background technology of the solutions involved in this application.

[0042] The charcoal product generation process involves heating the initial lump coal to a preset temperature in an industrial kiln. The volatile components in the initial lump coal decompose into exhaust gas, leaving behind non-volatile solid charcoal, which is called the target charcoal product. A conventional method for charcoal product generation involves combustion of the mixed flue gas from the initial lump coal's volatilization with air in an industrial kiln. This provides the kiln with a heat source, heating the initial lump coal to obtain the mixed flue gas and the target charcoal product.

[0043] For example, semi-coke is produced by heating semi-coke lumps in an industrial kiln to 550–750℃. The volatile components in the semi-coke lumps decompose into semi-coke tail gas and coal tar, leaving behind non-volatile solid carbon, which is called semi-coke. Another example is shaped coke, produced by heating shaped coke lumps in an industrial kiln to 1000–1300℃. The volatile components in the shaped coke lumps decompose into tail gas and coal tar, leaving behind non-volatile solid carbon, which is called shaped coke.

[0044] like Figure 1 The diagram shown illustrates the existing technology for the formation of charcoal products and the structural design for collecting coal tar with ammonia water. The following section uses semi-coke as an example. Figure 1 Explanation will be provided. In Figure 1In the process, air and semi-coke tail gas are introduced into the industrial kiln 101 by the blower 102 for combustion reaction, heating the semi-coke lump coal. When the temperature of the semi-coke lump coal rises from room temperature to 550℃~750℃, a mixed gas and hot semi-coke are obtained. The mixed gas is then condensed and separated in the cooling coke collector 104 to obtain semi-coke tail gas and coal tar. The semi-coke tail gas is stored in the tail gas storage device 103, and the coal tar is stored in the coal tar storage tank 106.

[0045] Hot-pressed semi-coke undergoes cooling and screening in cooling and screening equipment 107 to obtain the target semi-coke, which is then stored in charcoal product storage tank 105. The composition of the semi-coke tail gas is: oxygen 0.5%, carbon monoxide 12%, carbon dioxide 10%, nitrogen 44.5%, hydrogen 24%, methane 8%, C... n H n 1%. It is evident that the gas composition in semi-coke tail gas is complex. Furthermore, the total content of oxygen, carbon monoxide, carbon dioxide, and nitrogen in the aforementioned semi-coke tail gas is 67%, while the total content of hydrogen and methane is 33%. This increases the cost of separating the various gases in the semi-coke tail gas, thereby reducing its utilization rate.

[0046] In addition, the mixed gas is condensed and separated in the cooling coke collector 104 to obtain semi-coke tail gas and coal tar. This process requires ammonia water washing to collect coal tar, which not only consumes a large amount of ammonia water, but also makes it difficult to collect coal tar.

[0047] Therefore, improving the collection method of coal tar in the exhaust gas generated during the heat treatment of charcoal products is a problem that needs to be solved.

[0048] To address the aforementioned problems, this application provides a method for dry quenching of coal tar in charcoal product tail gas, thereby improving the collection of coal tar in the exhaust gas generated during the heat treatment of charcoal products. This application also provides a system for dry quenching of coal tar in charcoal product tail gas.

[0049] The dry quenching method for coal tar from tail gas provided in this application can be applied to the preparation of semi-coke, coke, and briquettes. The required temperature data differs at each stage of the preparation process for semi-coke and coke, while the required temperature data is the same at each stage of the preparation process for briquettes and coke.

[0050] Please refer to Figure 2 This is a schematic diagram of the target charcoal product generation process provided in the embodiments of this application. Figure 2 The process shown involves the production of self-generated dry-quenched coal tar from tail gas, applicable to semi-coke, coke, and briquettes. The following description uses temperature data changes during semi-coke production as an example to illustrate the material and temperature changes in each component during the self-generated dry-quenched coal tar process.

[0051] exist Figure 2 In China, the self-produced gas dry coal tar process includes the following main processes:

[0052] First, the tail gas generated during the processing of the target semi-coke is converted into plasma hot air medium gas through a plasma hot air furnace 201 and supplied to the heating furnace 202. During the heating stage of the heating furnace, the furnace layer 202-2 uses the plasma hot air medium gas to heat the semi-coke lump coal, obtaining high-temperature tail gas with a fourth temperature (550-750℃) and high-temperature semi-coke products with a fourth temperature (550-750℃). Second, during the preheating stage of the heating furnace, the high-temperature tail gas with the fourth temperature undergoes waste heat recovery treatment in the furnace layer 202-1 to obtain exhaust tail gas with a sixth temperature (70-90℃). The exhaust tail gas with the sixth temperature is discharged through the outlet 202-4 of the furnace layer in the preheating stage of the heating furnace and then enters the oil-repellent dust removal device 203. Third, the gas refrigeration and heating device 207 cools the first target tail gas provided in the target charcoal product tail gas storage device 204 to obtain cooled tail gas (temperature -20 to -45℃). The cooled exhaust gas is supplied to the oleophobic dust collector 203, which uses the cooled exhaust gas to condense and separate the exhaust gas at the sixth temperature, separating the gaseous coal tar and combustible gas contained in the exhaust gas at the sixth temperature, to obtain a liquid coal tar product at the seventh temperature (30°C) and a combustible gas at the seventh temperature (30°C). The coal tar product is stored in the coal tar product storage device 205. Fourth, after the second target semi-coke exhaust gas at the seventh temperature is allowed to stand for a preset time, a first target semi-coke exhaust gas at the first temperature (room temperature) is obtained. The first target semi-coke exhaust gas and the second target semi-coke exhaust gas are the only difference in temperature, and have the same gas composition. Both the first target semi-coke exhaust gas and the second target semi-coke exhaust gas can be supplied to the plasma hot air furnace to be converted into plasma hot air medium gas. The first target semi-coke exhaust gas is supplied by the target charcoal product exhaust gas storage device 204 to the gas cooling and heating device 207 to prepare cooled exhaust gas.

[0053] Therefore, in the above process, the self-generated tail gas produced during the preparation of the target charcoal product is cooled to obtain cooled tail gas. This cooled tail gas is then used to condense and separate the mixed gas discharged from the heating furnace to obtain coal tar products and the target tail gas. Because the self-generated tail gas is converted into plasma hot air medium gas during the preparation of the target charcoal product to provide a heating source for the heating furnace, the target tail gas produced during the preparation of the target charcoal product does not contain various impurity gases generated by oxygen combustion, and the total gas content of hydrogen and methane in the target tail gas is greater than or equal to 80%. Correspondingly, the condensation and separation process of the mixed gas discharged from the heating furnace using the cooled tail gas does not contain other impurity gases, does not produce water vapor, and does not use ammonia water to collect coal tar. This not only improves the collection efficiency of coal tar in the mixed gas and increases the amount of coal tar collected, but also enhances the utilization rate of the self-generated tail gas.

[0054] First Embodiment

[0055] Please refer to Figure 4 This is a flowchart of a method for dry quenching coal tar from charcoal product tail gas, provided in the first embodiment of this application. The following is in conjunction with... Figure 4 The method for dry quenching of coal tar from charcoal product tail gas provided in the first embodiment of this application is described in detail. The method for dry quenching of coal tar from charcoal product tail gas provided in the first embodiment is similar to... Figure 2 The process for producing the target charcoal product shown corresponds to this process; please refer to [reference needed]. Figure 2 The description. Figure 4 The method for dry quenching coal tar from tail gas of charcoal products shown includes steps S401-S403.

[0056] like Figure 4 As shown, in step S401, the first target exhaust gas with a first temperature generated during the processing of the target charcoal product is cooled to obtain cooled exhaust gas.

[0057] This step is used to cool the first target tail gas generated during the processing of the target charcoal product to obtain cooled tail gas, which is then used in subsequent steps to condense and separate the exhaust tail gas with a sixth temperature generated during the processing of the target charcoal product to obtain coal tar products.

[0058] The step of cooling the first target exhaust gas with a first temperature generated during the processing of the target charcoal product to obtain cooled exhaust gas includes: cooling the first target exhaust gas through a gas refrigeration and heating device to obtain cooled exhaust gas with an eighth temperature, wherein the eighth temperature is lower than the first temperature.

[0059] The first target exhaust gas is cooled, which can be referred to as... Figure 2The gas cooling and heating device 207 in the process reduces the temperature of the first target exhaust gas from room temperature to -20 to -45°C, obtaining cooled exhaust gas. The gas cooling and heating device 207 is powered by a compressor 208, which pressurizes the gas cooling and heating device 207 by 1 MPa. Specifically, the gas cooling and heating device is a vortex tube. The process of cooling the first target exhaust gas through the gas cooling and heating device to obtain cooled exhaust gas with an eighth temperature includes: separating the first target exhaust gas through the vortex tube into cooled exhaust gas with an eighth temperature and hot gas with a ninth temperature; wherein the hot gas with the ninth temperature is introduced into the heating stage furnace layer through the air inlet of the heating stage furnace layer, and after heat exchange with the target plasma hot air medium gas, it is used to heat the preheated carbon product to obtain high-temperature exhaust gas with a fourth temperature and high-temperature carbon product with the fourth temperature; the eighth temperature is lower than the first temperature, the first temperature is lower than the ninth temperature, and the ninth temperature is lower than the fourth temperature.

[0060] Continue to refer to Figure 2 The gas refrigeration and heating device 207 is a vortex tube. The vortex tube receives the first target tail gas at room temperature from the target charcoal product tail gas storage device 204. The first target tail gas is processed to obtain a cooling tail gas at an eighth temperature and a hot gas at a ninth temperature. The eighth temperature is -20 to -45℃, and the ninth temperature is 130 to 160℃. In the dry quenching stage of the heating furnace, the furnace layer 202-3 uses the cooling tail gas to dry quench the high-temperature charcoal products at the fourth temperature, obtaining the target charcoal products at the fifth temperature. These are discharged from the charcoal outlet 202-7 of the dry quenching stage furnace layer and stored in the target charcoal product storage device 206. In the heating stage of the heating furnace, the hot gas at the ninth temperature is introduced into the air inlet of the furnace layer. After heat exchange with the target plasma hot air medium gas, the preheated charcoal products are heated to obtain high-temperature charcoal products at the fourth temperature and high-temperature tail gas at the fourth temperature.

[0061] like Figure 4 As shown, in step S402, the cooling exhaust gas is used to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product, thereby obtaining a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature.

[0062] This step involves using an oleophobic dust collector to condense and separate the exhaust gas from the sixth temperature. This process separates the gaseous coal tar and combustible gas contained in the exhaust gas from the sixth temperature, resulting in liquid coal tar products and combustible gas.

[0063] Specifically, the step of using the cooling exhaust gas to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product, to obtain a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature, includes:

[0064] The cooling exhaust gas is subjected to heat exchange treatment with the exhaust gas at the sixth temperature. The gaseous coal tar and combustible gas in the exhaust gas at the sixth temperature are condensed and separated to obtain a liquid coal tar product at the seventh temperature and a second target exhaust gas at the seventh temperature.

[0065] Continue to refer to Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of the heating furnace provided in an embodiment of this application. The inlet of the oleophobic dust collector 203 receives cooling exhaust gas from the gas refrigeration and heating device 207, and also receives exhaust gas at a sixth temperature from the outlet 202-4 of the furnace layer during the preheating stage of the heating furnace. The exhaust gas at the sixth temperature is a mixture of gaseous coal tar and combustible gas. The oleophobic dust collector 203 condenses and separates the exhaust gas at the sixth temperature from the cooling exhaust gas, reducing the temperature of the exhaust gas from the sixth temperature (70-90°C) to the seventh temperature (30°C). At this time, the state of the coal tar changes from gaseous to liquid, thereby realizing the separation process of coal tar and combustible gas, and obtaining coal tar products and combustible gas.

[0066] Furthermore, it also includes: obtaining exhaust gas with a sixth temperature generated during the processing of the target charcoal product; obtaining exhaust gas with a sixth temperature generated during the processing of the target charcoal product includes: plasma treatment of the target exhaust gas to obtain plasma hot air medium gas, the target exhaust gas including the first target exhaust gas and the second target exhaust gas; using the plasma hot air medium gas to provide a heating source during the heating stage of the processing of the target charcoal product, heating the preheated charcoal product to obtain high-temperature exhaust gas with a fourth temperature and high-temperature charcoal product with a fourth temperature, the fourth temperature being the preparation temperature that meets the preparation conditions of the high-temperature charcoal product; using the high-temperature exhaust gas with the fourth temperature to provide a preheating heat source during the preheating stage of the processing of the target charcoal product, preheating the charcoal raw material product to be processed to obtain preheated charcoal product and exhaust gas with a sixth temperature; wherein, the sixth temperature is lower than the fourth temperature.

[0067] The exhaust gas at the sixth temperature is the mixed gas discharged from the gas outlet of the furnace layer during the preheating stage of the heating furnace when the target charcoal product is being prepared. The following is combined with... Figure 2 and Figure 3It describes the preparation process of the target charcoal product, which includes a preheating stage, a heating stage, and a dry quenching stage.

[0068] In the preheating stage, the charcoal raw material product to be processed is preheated to obtain preheated charcoal products. Specifically, the high-temperature exhaust gas at the fourth temperature is subjected to flue gas waste heat recovery treatment, and the high-temperature exhaust gas at the fourth temperature is used to preheat the charcoal raw material product to be processed to obtain preheated charcoal products and exhaust gas at a sixth temperature. The exhaust gas at the sixth temperature is a mixed gas discharged from the outlet of the heating furnace, and the mixed gas includes gaseous coal tar at the sixth temperature and combustible gas at the sixth temperature.

[0069] Continue to refer to Figure 2 and Figure 3 In the preheating stage of the heating furnace, furnace layer 202-1, the high-temperature tail gas at the fourth temperature is used to preheat the charcoal raw material product to be processed. While obtaining the preheated charcoal product, the high-temperature tail gas at the fourth temperature is treated with waste heat recovery to obtain exhaust tail gas at the sixth temperature. After being discharged from the gas outlet 202-4 of the furnace layer in the preheating stage of the heating furnace, it enters the oil-repellent dust removal equipment 203.

[0070] The exhaust gas at the sixth temperature is a mixed gas, which includes gaseous coal tar at the sixth temperature and combustible gas at the sixth temperature. In order to separate the gaseous coal tar and combustible gas in the mixed gas, this application uses an oil-repellent dust removal device 203 to perform condensation separation treatment on the mixed gas.

[0071] During the heating stage, the preheated carbon product is heated by the target plasma hot air medium gas at the third temperature to obtain the high-temperature carbon product at the fourth temperature and the high-temperature exhaust gas at the fourth temperature.

[0072] The process of obtaining the target plasma hot air medium gas and the process of heating the preheated carbon products using the target plasma hot air medium gas are as follows:

[0073] The target exhaust gas generated during the processing of the target charcoal product is subjected to plasma treatment to obtain a target plasma hot air medium gas with a third temperature. The target exhaust gas includes a first target exhaust gas or a second target exhaust gas. The first target exhaust gas is a combustible gas with a first temperature stored in a target charcoal product exhaust gas storage device. The second target exhaust gas is a combustible gas with a seventh temperature of 30°C obtained after condensation and separation treatment by an oleophobic dust removal device. The target plasma hot air medium gas with the third temperature is used to provide a heating heat source for the heating stage of the processing of the target charcoal product to obtain a high-temperature charcoal product with the fourth temperature and a high-temperature exhaust gas with the fourth temperature. The first temperature is lower than the fourth temperature, the seventh temperature is lower than the fourth temperature, and the fourth temperature is lower than the third temperature.

[0074] like Figure 2 As shown, in the initial stage, the target charcoal product tail gas storage device supplies the first target tail gas to the plasma hot air furnace, which is a combustible gas at room temperature. The plasma hot air medium gas is selected according to... Figure 2 The processing procedure shown involves obtaining exhaust gas from the outlet of the heating furnace, which is then condensed and separated by an oleophobic dust removal device to obtain a second target exhaust gas with a seventh temperature and a liquid coal tar product with a seventh temperature. The second target exhaust gas with a seventh temperature is a combustible gas with a seventh temperature of 30°C. In subsequent stages, the second target exhaust gas can be used for plasma treatment to obtain a plasma hot air medium gas.

[0075] The target exhaust gas is plasma-treated in a plasma hot blast furnace to obtain an initial plasma hot blast medium gas with a second temperature. This process occurs inside the plasma hot blast furnace, and the second temperature is 3000–5000°C. The initial plasma hot blast medium gas at the second temperature is then temperature-adjusted at the connection between the plasma hot blast furnace and the heating furnace to obtain a target plasma hot blast medium gas with a third temperature. Therefore, the purpose of using the plasma hot blast medium gas to heat the charcoal raw material is to volatilize the volatile components. Thus, the initial plasma hot blast medium gas at the second temperature cannot be used directly, as it is unsuitable for the heating furnace and would also prevent carbonization of the charcoal raw material. Therefore, the target plasma hot blast medium gas at the third temperature is introduced into the heating stage of the heating furnace as a heat source for preheating the charcoal products. This heat treatment causes the volatile components in the preheated charcoal products to volatilize, while retaining the non-volatile solid char components.

[0076] The third temperature should be higher than the volatilization temperature of the volatile components in the preheated charcoal product. Therefore, the volatilization temperature of volatile components varies depending on the type of charcoal. For example, the volatilization temperature of volatile components in semi-coke is 550℃~750℃, so the third temperature should be higher than 550℃~750℃. For molded coke, the volatilization temperature of volatile components is 1000℃~1300℃, so the third temperature should be higher than 1000℃~1300℃. However, the difference between the third temperature and the volatilization temperature of the volatile components in the preheated charcoal product should be less than a preset difference threshold, for example, a preset difference threshold of 100~300℃.

[0077] The temperature of the plasma hot air medium gas is adjusted from the second temperature to the third temperature. This can be achieved using a heat exchange device to pre-condition the initial plasma hot air medium gas at the second temperature. For example, a water-cooled pipe can be fabricated using the same material as the plasma hot air furnace. The plasma hot air medium gas is then passed through the water-cooled pipe for temperature conditioning before entering the furnace. Other methods can also be used to pre-condition the initial plasma hot air medium gas at the second temperature; no restrictions are placed on this method.

[0078] Continue to refer to Figure 2 and Figure 3 In the heating stage furnace layer 202-2 of the heating furnace, hot gas at the ninth temperature enters the heating stage furnace layer through the air inlet 202-5. The hot gas at the ninth temperature and the target plasma hot air medium gas at the third temperature enter the heating stage furnace layer together through the air inlet 202-5 of the heating stage furnace layer for heat exchange treatment, and then heat the preheated carbon products.

[0079] In the dry quenching stage, cooling exhaust gas is used to dry quench the high-temperature charcoal product at a fourth temperature to obtain a target charcoal product with a fifth temperature. Specifically, the step of using the cooling exhaust gas to dry quench the high-temperature charcoal product at a fourth temperature generated during the processing of the target charcoal product to obtain a target charcoal product with a fifth temperature includes: providing the cooling exhaust gas to the heating furnace through the air inlet of the furnace layer in the dry quenching stage, so that the cooling exhaust gas performs dry quenching on the high-temperature charcoal product at a fourth temperature generated during the heating stage of the heating furnace in the furnace layer of the dry quenching stage of the heating furnace to obtain the target charcoal product with the fifth temperature.

[0080] Continue to refer to Figure 2 and Figure 3The cooling exhaust gas at the eighth temperature generated by the gas refrigeration and heating equipment 207 enters the dry quenching stage furnace layer through the air inlet 202-6. The high-temperature charcoal products at the fourth temperature undergo dry quenching treatment, transforming them into the target charcoal products at the fifth temperature. If the high-temperature charcoal products are high-temperature semi-coke products, the fourth temperature is 550–750℃; if the high-temperature charcoal products are coke or shaped coke, the fourth temperature is 1000–1300℃; and the fifth temperature is less than or equal to 50℃.

[0081] The above describes the three stages of the reaction process involved in the preparation of the target charcoal product.

[0082] like Figure 4 As shown, in step S403, the second target exhaust gas is stored in the target charcoal product exhaust gas storage device, and after standing for a preset time, the first target exhaust gas is obtained; wherein, the first target exhaust gas is a combustible gas with a first temperature, the first temperature being room temperature, and the second target exhaust gas is a combustible gas with a seventh temperature, the seventh temperature being 30°C; the exhaust gas with the sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, the mixed gas including gaseous coal tar with the sixth temperature and combustible gas with the sixth temperature, the first temperature being lower than the sixth temperature, and the seventh temperature being lower than the sixth temperature.

[0083] This step is used to obtain the first target tail gas, which is the gaseous raw material for preparing the cooling tail gas with an eighth temperature using gas refrigeration and heating equipment. In other words, the cooling tail gas obtained after cooling the self-produced tail gas from the target charcoal product preparation process is used to condense and separate the sixth temperature exhaust tail gas to obtain coal tar products. This process eliminates the need for ammonia water to collect coal tar. Furthermore, using self-produced tail gas for coal tar collection improves the collection efficiency and the utilization efficiency of the self-produced tail gas.

[0084] The dry quenching method for coal tar in charcoal product tail gas provided in this application embodiment involves cooling a first target tail gas generated during the processing of the target charcoal product to obtain cooled tail gas. Then, a sixth-temperature exhaust tail gas generated during the processing of the target charcoal product is subjected to condensation separation treatment to obtain a liquid coal tar product with a seventh temperature and a second target tail gas with a seventh temperature. The sixth-temperature exhaust tail gas is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, comprising gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature. The second target tail gas is stored in a target charcoal product tail gas storage device and allowed to stand for a preset time to obtain the first target tail gas. In this process, the self-generated tail gas obtained during the processing of the target charcoal product is cooled, and then the combustible gas and gaseous coal tar in the sixth-temperature exhaust tail gas are condensed and separated, achieving the separation of combustible gas and coal tar, and obtaining a liquid coal tar product. Therefore, it can be seen that the condensation separation of the mixed gas generated during the processing of the target charcoal products, using cooled tail gas (after cooling the self-produced tail gas) as the medium for separating combustible gases and coal tar from the mixed gas, rather than other external gases, reduces the generation of impurities during the preparation of coal tar products. Using cooled tail gas (after cooling the self-produced tail gas) for condensation separation of the mixed gas not only improves the collection efficiency of coal tar in the mixed gas and increases the amount of coal tar collected, but also enhances the utilization rate of the self-produced tail gas.

[0085] Second Embodiment

[0086] Please refer to Figure 5 This is a logic structure diagram of a dry quenching coal tar system for charcoal product tail gas provided in the second embodiment of this application. The following is in conjunction with... Figure 5 The dry quenching coal tar system for charcoal product tail gas provided in the second embodiment of this application will be described in detail. The dry quenching coal tar system for charcoal product tail gas provided in the second embodiment is similar to that in the first embodiment and... Figure 2 The process for producing the target charcoal product shown corresponds to this process; please refer to [reference needed]. Figure 2 The description of the first embodiment will not be repeated here.

[0087] Figure 4 The charcoal product tail gas dry quenching coal tar system 200 shown includes: a gas refrigeration and heating device 207, an oleophobic dust removal device 203, and a target charcoal product tail gas storage device 204.

[0088] The gas cooling and heating equipment 207 is used to cool the first target exhaust gas with a first temperature generated during the processing of the target charcoal product to obtain a cooled exhaust gas with an eighth temperature, and to provide the cooled exhaust gas to the oleophobic dust removal equipment 203.

[0089] The oleophobic dust removal device 203 is used to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product using the cooling exhaust gas, to obtain a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature, and to provide the second target exhaust gas to the target charcoal product exhaust gas storage device 204.

[0090] The target charcoal product tail gas storage device 204 is used to obtain the second target tail gas provided by the oleophobic dust removal device, and after standing for a preset time, obtain the first target tail gas and provide the first target tail gas to the gas refrigeration and heating device 207.

[0091] Wherein, the first target exhaust gas is a combustible gas with a first temperature, which is room temperature; the second target exhaust gas is a combustible gas with a seventh temperature, which is 30°C; the exhaust gas with a sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, the mixed gas including gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature; the eighth temperature is lower than the first temperature and the seventh temperature, the first temperature is lower than the sixth temperature, and the seventh temperature is lower than the sixth temperature.

[0092] Please refer to Figure 2 The gas cooling and heating device 207 reduces the temperature of the first target exhaust gas from room temperature to -20 to -45°C, obtaining cooled exhaust gas. Specifically, the gas cooling and heating device 207 is a vortex tube; the vortex tube is used to separate the first target exhaust gas into cooled exhaust gas with an eighth temperature and hot gas with a ninth temperature, providing the cooled exhaust gas with the eighth temperature to the oleophobic dust removal device, and providing the hot gas with the ninth temperature to the heating furnace; wherein, the hot gas with the ninth temperature is used to enter the heating stage furnace layer through the air inlet of the heating stage furnace layer, and after heat exchange treatment with the target plasma hot air medium gas, it heats the preheated carbon product to obtain the high-temperature exhaust gas with the fourth temperature and the high-temperature carbon product with the fourth temperature; the eighth temperature is lower than the first temperature, the first temperature is lower than the ninth temperature, and the ninth temperature is lower than the fourth temperature.

[0093] The gas refrigeration and heating device 207 is a vortex tube. The vortex tube receives the first target tail gas at room temperature from the target charcoal product tail gas storage device 204, processes the first target tail gas to obtain a cooled tail gas at an eighth temperature and a hot gas at a ninth temperature. The eighth temperature is -20 to -45℃, and the ninth temperature is 130 to 160℃. During the dry quenching stage of the heating furnace, the cooled tail gas is used to dry quench the high-temperature charcoal products at the fourth temperature. During the heating stage of the heating furnace, the hot gas at the ninth temperature is introduced into the inlet of the furnace layer. After heat exchange with the target plasma hot air medium gas, the preheated charcoal products are heated to obtain high-temperature charcoal products at the fourth temperature and high-temperature tail gas at the fourth temperature.

[0094] The oleophobic dust removal equipment 203 performs condensation and separation treatment on the exhaust gas at the sixth temperature, and condenses and separates the gaseous coal tar and combustible gas contained in the exhaust gas at the sixth temperature to obtain liquid coal tar products and combustible gas.

[0095] Specifically, the oleophobic dust removal device 203 is used to perform heat exchange treatment between the cooled exhaust gas and the exhaust gas at the sixth temperature, and to perform condensation and separation treatment on the gaseous coal tar and combustible gas in the exhaust gas at the sixth temperature, so as to obtain the liquid coal tar product at the seventh temperature and the second target exhaust gas at the seventh temperature.

[0096] Continue to refer to Figure 2 and Figure 3 , Figure 3 This is a schematic diagram of the heating furnace provided in an embodiment of this application. The inlet of the oleophobic dust collector 203 receives cooling exhaust gas from the gas refrigeration and heating device 207, and also receives exhaust gas at a sixth temperature from the outlet 202-4 of the furnace layer during the preheating stage of the heating furnace. The exhaust gas at the sixth temperature is a mixture of gaseous coal tar and combustible gas. The oleophobic dust collector 203 condenses and separates the exhaust gas at the sixth temperature from the cooling exhaust gas, reducing the temperature of the exhaust gas from the sixth temperature (70-90°C) to the seventh temperature (30°C). At this time, the state of the coal tar changes from gaseous to liquid, thereby realizing the separation process of coal tar and combustible gas, and obtaining coal tar products and combustible gas.

[0097] The target charcoal product tail gas storage device 204 obtains a first target tail gas, which is the gaseous raw material for preparing cooling tail gas with an eighth temperature using a gas refrigeration and heating device. In other words, the cooling tail gas obtained after cooling the self-produced tail gas from the target charcoal product preparation process is used to condense and separate the discharged tail gas at the sixth temperature, thereby obtaining coal tar products. This process eliminates the need for ammonia water to collect coal tar. Furthermore, using self-produced tail gas after treatment to collect coal tar improves the collection efficiency of coal tar and enhances the utilization efficiency of the self-produced tail gas.

[0098] The exhaust gas at the sixth temperature is a mixed gas discharged from the outlet of the furnace layer during the preheating stage of the heating furnace when the target charcoal product is being prepared. Therefore, the system further includes: a plasma hot air furnace and a heating furnace; the target charcoal product exhaust gas storage device is also used to provide the first target exhaust gas to the plasma hot air furnace; the oleophobic dust removal device is also used to provide the second target exhaust gas to the plasma hot air furnace; the plasma hot air furnace is used to plasma-treat the target exhaust gas to obtain a plasma hot air medium gas, the target exhaust gas including the first target exhaust gas and the second target exhaust gas; the plasma hot air medium gas is provided to the heating furnace; the heating furnace is used to apply the plasma hot air medium gas to the target charcoal product... The heating stage of the process provides a heat source to heat the preheated charcoal product, obtaining high-temperature exhaust gas with a fourth temperature and high-temperature charcoal product with a fourth temperature, wherein the fourth temperature is the preparation temperature that meets the preparation conditions of the high-temperature charcoal product; the high-temperature exhaust gas with the fourth temperature is used as a preheating heat source in the preheating stage of the target charcoal product processing process to preheat the charcoal raw material product to be processed, obtaining preheated charcoal product and exhaust exhaust gas with a sixth temperature; the exhaust exhaust gas with the sixth temperature is discharged through the outlet of the heating furnace and then provided to the oil-repellent dust removal equipment; wherein, the sixth temperature is lower than the fourth temperature.

[0099] The following combination Figure 2 and Figure 3 It describes the preparation process of the target charcoal product, which includes a preheating stage, a heating stage, and a dry quenching stage.

[0100] In the preheating stage, the charcoal raw material product to be processed is preheated to obtain preheated charcoal products. Specifically, the high-temperature exhaust gas at the fourth temperature is subjected to flue gas waste heat recovery treatment, and the high-temperature exhaust gas at the fourth temperature is used to preheat the charcoal raw material product to be processed to obtain preheated charcoal products and exhaust gas at a sixth temperature. The exhaust gas at the sixth temperature is a mixed gas discharged from the outlet of the heating furnace, and the mixed gas includes gaseous coal tar at the sixth temperature and combustible gas at the sixth temperature.

[0101] Continue to refer to Figure 2 and Figure 3 In the preheating stage of the heating furnace, furnace layer 202-1, the high-temperature tail gas at the fourth temperature is used to preheat the charcoal raw material product to be processed. While obtaining the preheated charcoal product, the high-temperature tail gas at the fourth temperature is treated with waste heat recovery to obtain exhaust tail gas at the sixth temperature. After being discharged from the gas outlet 202-4 of the furnace layer in the preheating stage of the heating furnace, it enters the oil-repellent dust removal equipment 203.

[0102] The exhaust gas at the sixth temperature is a mixed gas, which includes gaseous coal tar at the sixth temperature and combustible gas at the sixth temperature. In order to separate the gaseous coal tar and combustible gas in the mixed gas, this application uses an oil-repellent dust removal device 203 to perform condensation separation treatment on the mixed gas.

[0103] During the heating stage, the preheated carbon product is heated by the target plasma hot air medium gas at the third temperature to obtain the high-temperature carbon product at the fourth temperature and the high-temperature exhaust gas at the fourth temperature.

[0104] The process of obtaining the target plasma hot air medium gas and the process of heating the preheated carbon products using the target plasma hot air medium gas are as follows:

[0105] The target exhaust gas generated during the processing of the target charcoal product is subjected to plasma treatment to obtain a target plasma hot air medium gas with a third temperature. The target exhaust gas includes a first target exhaust gas or a second target exhaust gas. The first target exhaust gas is a combustible gas with a first temperature stored in a target charcoal product exhaust gas storage device. The second target exhaust gas is a combustible gas with a seventh temperature of 30°C obtained after condensation and separation treatment by an oleophobic dust removal device. The target plasma hot air medium gas with the third temperature is used to provide a heating heat source for the heating stage of the processing of the target charcoal product to obtain a high-temperature charcoal product with the fourth temperature and a high-temperature exhaust gas with the fourth temperature. The first temperature is lower than the fourth temperature, the seventh temperature is lower than the fourth temperature, and the fourth temperature is lower than the third temperature.

[0106] like Figure 2 As shown, in the initial stage, the target charcoal product tail gas storage device supplies the first target tail gas to the plasma hot air furnace, which is a combustible gas at room temperature. The plasma hot air medium gas is selected according to... Figure 2The processing procedure shown involves obtaining exhaust gas from the outlet of the heating furnace, which is then condensed and separated by an oleophobic dust removal device to obtain a second target exhaust gas with a seventh temperature and a liquid coal tar product with a seventh temperature. The second target exhaust gas with a seventh temperature is a combustible gas with a seventh temperature of 30°C. In subsequent stages, the second target exhaust gas can be used for plasma treatment to obtain a plasma hot air medium gas.

[0107] The target exhaust gas is plasma-treated in a plasma hot blast furnace to obtain an initial plasma hot blast medium gas with a second temperature. This process occurs inside the plasma hot blast furnace, and the second temperature is 3000–5000°C. The initial plasma hot blast medium gas at the second temperature is then temperature-adjusted at the connection between the plasma hot blast furnace and the heating furnace to obtain a target plasma hot blast medium gas with a third temperature. Therefore, the purpose of using the plasma hot blast medium gas to heat the charcoal raw material is to volatilize the volatile components. Thus, the initial plasma hot blast medium gas at the second temperature cannot be used directly, as it is unsuitable for the heating furnace and would also prevent carbonization of the charcoal raw material. Therefore, the target plasma hot blast medium gas at the third temperature is introduced into the heating stage of the heating furnace as a heat source for preheating the charcoal products. This heat treatment causes the volatile components in the preheated charcoal products to volatilize, while retaining the non-volatile solid char components.

[0108] The third temperature should be higher than the volatilization temperature of the volatile components in the preheated charcoal product. Therefore, the volatilization temperature of volatile components varies depending on the type of charcoal. For example, the volatilization temperature of volatile components in semi-coke is 550℃~750℃, so the third temperature should be higher than 550℃~750℃. For molded coke, the volatilization temperature of volatile components is 1000℃~1300℃, so the third temperature should be higher than 1000℃~1300℃. However, the difference between the third temperature and the volatilization temperature of the volatile components in the preheated charcoal product should be less than a preset difference threshold, for example, a preset difference threshold of 100~300℃.

[0109] The temperature of the plasma hot air medium gas is adjusted from the second temperature to the third temperature. This can be achieved using a heat exchange device to pre-condition the initial plasma hot air medium gas at the second temperature. For example, a water-cooled pipe can be fabricated using the same material as the plasma hot air furnace. The plasma hot air medium gas is then passed through the water-cooled pipe for temperature conditioning before entering the furnace. Other methods can also be used to pre-condition the initial plasma hot air medium gas at the second temperature; no restrictions are placed on this method.

[0110] Continue to refer to Figure 2 and Figure 3In the heating stage furnace layer 202-2 of the heating furnace, hot gas at the ninth temperature enters the heating stage furnace layer through the air inlet 202-5. The hot gas at the ninth temperature and the target plasma hot air medium gas at the third temperature enter the heating stage furnace layer together through the air inlet 202-5 of the heating stage furnace layer for heat exchange treatment, and then heat the preheated carbon products.

[0111] In the dry quenching stage, cooling exhaust gas is used to dry quench the high-temperature charcoal product at a fourth temperature to obtain a target charcoal product with a fifth temperature. Specifically, the step of using the cooling exhaust gas to dry quench the high-temperature charcoal product at a fourth temperature generated during the processing of the target charcoal product to obtain a target charcoal product with a fifth temperature includes: providing the cooling exhaust gas to the heating furnace through the air inlet of the furnace layer in the dry quenching stage, so that the cooling exhaust gas performs dry quenching on the high-temperature charcoal product at a fourth temperature generated during the heating stage of the heating furnace in the furnace layer of the dry quenching stage of the heating furnace to obtain the target charcoal product with the fifth temperature.

[0112] Continue to refer to Figure 2 and Figure 3 The cooling exhaust gas at the eighth temperature generated by the gas refrigeration and heating equipment 207 enters the dry quenching stage furnace layer through the air inlet 202-6. The high-temperature charcoal products at the fourth temperature undergo dry quenching treatment, transforming them into the target charcoal products at the fifth temperature. If the high-temperature charcoal products are high-temperature semi-coke products, the fourth temperature is 550–750℃; if the high-temperature charcoal products are coke or shaped coke, the fourth temperature is 1000–1300℃; and the fifth temperature is less than or equal to 50℃.

[0113] The above describes the three stages of the reaction process involved in the preparation of the target charcoal product.

[0114] The dry quenching coal tar system for charcoal product tail gas provided in this application includes: a gas refrigeration and heating device, an oleophobic dust removal device, and a target charcoal product tail gas storage device. The gas refrigeration and heating device cools the first target tail gas generated during the processing of the target charcoal product to obtain cooled tail gas. The oleophobic dust removal device condenses and separates the exhaust tail gas with a sixth temperature generated during the processing of the target charcoal product to obtain a liquid coal tar product with a seventh temperature and a second target tail gas with a seventh temperature. The exhaust tail gas with the sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, and the mixed gas includes gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature. The target charcoal product tail gas storage device stores the second target tail gas, and after standing for a preset time, obtains the first target tail gas. In this process, the self-produced tail gas obtained during the processing of the target charcoal product is cooled and then used to condense and separate the combustible gas and gaseous coal tar in the exhaust gas at the sixth temperature. This separation process achieves the separation of combustible gas and coal tar, resulting in a liquid coal tar product. Therefore, it can be seen that the medium for condensing and separating the combustible gas and coal tar in the mixed gas generated during the processing of the target charcoal product is the cooled tail gas obtained from the self-produced tail gas, rather than other external gases. Thus, this method reduces the generation of impurities during the preparation of coal tar products. Using the cooled tail gas obtained from the self-produced tail gas for condensing and separating the mixed gas not only improves the collection efficiency of coal tar in the mixed gas and increases the amount of coal tar collected, but also enhances the utilization rate of the self-produced tail gas.

[0115] Based on the above description of the first and second embodiments, the following describes the beneficial effects of using the method of the first embodiment provided in this application to dry quench coal tar through Comparative Example 1 and Example 1.

[0116] Comparative Example 1

[0117] Comparative Example 1 is an example of the prior art that uses... Figure 1 In the semi-coke production process shown, ammonia water is used to collect coal tar. First, a mixture of flue gas and air is used in an industrial kiln for combustion reaction to heat the semi-coke lump coal, yielding semi-coke tail gas and coal tar. The composition of the semi-coke tail gas is as follows: oxygen 0.5%, carbon monoxide 12%, carbon dioxide 10%, nitrogen 44.5%, hydrogen 24%, methane 8%, C... n H n1%. During this process, the exhaust gas from the heating furnace contains semi-coke tail gas and gaseous coal tar. Furthermore, the semi-coke tail gas has a complex composition, containing various impurity gases. Obtaining coal tar products through ammonia washing and cooling is difficult and costly; setting up a 300-ton ammonia treatment system requires an investment of approximately 2 billion yuan. Moreover, one heating furnace produces 200,000 tons of semi-coke annually, thus requiring a large amount of ammonia water to collect the coal tar. Therefore, using ammonia water to collect coal tar is complex, costly, and has low collection efficiency.

[0118] Example 1

[0119] Example 1 employs the dry quenching coal tar system and method for charcoal product tail gas provided in this application. The first target tail gas (combustible gas at room temperature) generated during the processing of the target semi-coke product is converted into plasma hot air medium gas. This plasma hot air medium gas is used to heat the preheated semi-coke product, resulting in high-temperature semi-coke tail gas and high-temperature semi-coke product with a fourth temperature (550–750°C). The high-temperature semi-coke tail gas with the fourth temperature (550–750°C) undergoes flue gas waste heat recovery treatment. This high-temperature semi-coke tail gas with the fourth temperature is then used to preheat the semi-coke raw material product (semi-coke lump coal or briquettes) to be processed, resulting in preheated semi-coke product and discharged semi-coke tail gas with a sixth temperature (70–90°C). The first target exhaust gas is cooled to obtain a cooled exhaust gas at an eighth temperature (-20 to -45°C). This cooled exhaust gas is then used to dry quench high-temperature semi-coke products at a fourth temperature, resulting in target semi-coke products with a fifth temperature (less than or equal to 50°C). The exhaust gas at a sixth temperature is then condensed and separated in an oleophobic dust collector to obtain a second target exhaust gas (a combustible gas at a seventh temperature, 30°C) and a liquid coal tar product. The second target exhaust gas is allowed to stand for a preset time to obtain the first target exhaust gas (a combustible gas at a first temperature, ambient temperature).

[0120] As shown in Comparative Example 1 and Example 1, the dry quenching method and system for coal tar from tail gas in this application utilizes the self-produced tail gas from the target coal product preparation process, converting it into a plasma hot air medium gas to process the coal raw material product to be processed, ultimately obtaining the target tail gas and the target coal product. The total gas content of hydrogen and combustible gas in the target tail gas is greater than or equal to 80%. Therefore, the gas components in the target tail gas are mostly combustible gases, and the impurity gases are negligible. This results in the exhaust tail gas (mixed gas) discharged from the heating furnace containing gaseous coal tar and combustible gas, with fewer impurity gases. Then, the self-produced tail gas is cooled to obtain cooled tail gas, and the exhaust tail gas (mixed gas) is condensed and separated to obtain the coal tar product. The medium for condensing and separating the combustible gas and coal tar in the mixed gas generated during the processing of the target coal product is the cooled tail gas from the self-produced tail gas, not other external gases. Therefore, this method reduces the generation of impurities during the preparation of coal tar products. By using the cooled tail gas after cooling treatment of the self-produced tail gas to condense and separate the mixed gas, it not only improves the collection efficiency of coal tar in the mixed gas and increases the amount of coal tar collected, but also improves the utilization rate of the self-produced tail gas.

Claims

1. A method for dry quenching of coal tar in charcoal product tail gas, characterized in that, include: Cool the first target exhaust gas with a first temperature generated during the processing of the target charcoal product to obtain cooled exhaust gas. The cooling exhaust gas is used to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product, thereby obtaining a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature. The second target exhaust gas is stored in the target charcoal product exhaust gas storage device, and after standing for a preset time, the first target exhaust gas is obtained. Wherein, the first target exhaust gas is a combustible gas with a first temperature, which is room temperature; the second target exhaust gas is a combustible gas with a seventh temperature, which is 30°C; the exhaust gas with the sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, the mixed gas including gaseous coal tar with the sixth temperature and combustible gas with the sixth temperature, the first temperature being lower than the sixth temperature, and the seventh temperature being lower than the sixth temperature.

2. The method according to claim 1, characterized in that, The cooling treatment of the first target exhaust gas with a first temperature generated during the processing of the target charcoal product to obtain cooled exhaust gas includes: The first target exhaust gas is cooled by a gas refrigeration and heating device to obtain a cooled exhaust gas with an eighth temperature, wherein the eighth temperature is lower than the first temperature.

3. The method according to claim 1, characterized in that, The step of using the cooling exhaust gas to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product, to obtain a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature, includes: The cooling exhaust gas is subjected to heat exchange treatment with the exhaust gas at the sixth temperature. The gaseous coal tar and combustible gas in the exhaust gas at the sixth temperature are condensed and separated to obtain a liquid coal tar product at the seventh temperature and a second target exhaust gas at the seventh temperature.

4. The method according to claim 2, characterized in that, The gas refrigeration and heating device is a vortex tube; the step of cooling the first target exhaust gas through the gas refrigeration and heating device to obtain cooled exhaust gas with an eighth temperature includes: The first target exhaust gas is separated into a cooled exhaust gas with an eighth temperature and a hot gas with a ninth temperature through the vortex tube. Wherein, the hot gas at the ninth temperature is introduced into the heating stage furnace layer through the air inlet of the heating stage furnace layer, and after heat exchange with the target plasma hot air medium gas, it is used to heat the preheated carbon product to obtain the high-temperature exhaust gas at the fourth temperature and the high-temperature carbon product at the fourth temperature; the eighth temperature is lower than the first temperature, the first temperature is lower than the ninth temperature, and the ninth temperature is lower than the fourth temperature.

5. The method according to claim 4, characterized in that, Also includes: Obtain the exhaust gas with a sixth temperature generated during the processing of the target charcoal product; The process of obtaining the exhaust gas with a sixth temperature generated during the processing of the target charcoal product includes: The target exhaust gas is subjected to plasma treatment to obtain a plasma hot air medium gas, wherein the target exhaust gas includes the first target exhaust gas and the second target exhaust gas. The plasma hot air medium gas is used to provide a heating source during the heating stage of the target carbon product processing, and the preheated carbon product is heated to obtain high-temperature exhaust gas with a fourth temperature and high-temperature carbon product with a fourth temperature, wherein the fourth temperature is the preparation temperature that meets the preparation conditions of the high-temperature carbon product. The high-temperature exhaust gas at the fourth temperature is used to provide a preheating heat source in the preheating stage of the target charcoal product processing process, to preheat the charcoal raw material product to be processed, and to obtain preheated charcoal products and exhaust gas with a sixth temperature. The sixth temperature is lower than the fourth temperature.

6. A dry quenching coal tar system for charcoal product tail gas, characterized in that, include: Gas refrigeration and heating equipment, oleophobic dust removal equipment, and tail gas storage equipment for target charcoal products; The gas refrigeration and heating equipment is used to cool the first target exhaust gas with a first temperature generated during the processing of the target charcoal product, to obtain a cooled exhaust gas with an eighth temperature, and to provide the cooled exhaust gas to the oleophobic dust removal equipment. The oleophobic dust removal equipment is used to condense and separate the exhaust gas with a sixth temperature generated during the processing of the target charcoal product using the cooling exhaust gas, to obtain a liquid coal tar product with a seventh temperature and a second target exhaust gas with a seventh temperature, and to provide the second target exhaust gas to the target charcoal product exhaust gas storage equipment. The target charcoal product exhaust gas storage device is used to obtain the second target exhaust gas provided by the oleophobic dust removal device, and after standing for a preset time, obtain the first target exhaust gas, and provide the first target exhaust gas to the gas refrigeration and heating device. Wherein, the first target exhaust gas is a combustible gas with a first temperature, which is room temperature; the second target exhaust gas is a combustible gas with a seventh temperature, which is 30°C; the exhaust gas with a sixth temperature is a mixed gas discharged from the outlet of the heating furnace during the processing of the target charcoal product, the mixed gas including gaseous coal tar with a sixth temperature and combustible gas with a sixth temperature; the eighth temperature is lower than the first temperature and the seventh temperature, the first temperature is lower than the sixth temperature, and the seventh temperature is lower than the sixth temperature.

7. The system according to claim 6, characterized in that, The oleophobic dust removal equipment is specifically used to perform heat exchange treatment between the cooled exhaust gas and the exhaust gas at the sixth temperature, and to perform condensation and separation treatment on the gaseous coal tar and combustible gas in the exhaust gas at the sixth temperature, so as to obtain a liquid coal tar product at the seventh temperature and a second target exhaust gas at the seventh temperature.

8. The system according to claim 7, characterized in that, The gas refrigeration and heating device is a vortex tube; The vortex tube is used to separate the first target exhaust gas into a cooled exhaust gas with an eighth temperature and a hot gas with a ninth temperature, providing the cooled exhaust gas with the eighth temperature to the oleophobic dust removal device and the hot gas with the ninth temperature to the heating furnace. Wherein, the hot gas at the ninth temperature is introduced into the heating stage furnace layer through the air inlet of the heating stage furnace layer, and after heat exchange with the target plasma hot air medium gas, it is used to heat the preheated carbon product to obtain the high-temperature exhaust gas at the fourth temperature and the high-temperature carbon product at the fourth temperature; the eighth temperature is lower than the first temperature, the first temperature is lower than the ninth temperature, and the ninth temperature is lower than the fourth temperature.

9. The system according to claim 6, characterized in that, Also includes: Plasma hot air furnaces and heating furnaces; The target charcoal product tail gas storage device is also used to provide the first target tail gas to the plasma hot air furnace; The oleophobic dust removal device is also used to provide the second target exhaust gas to the plasma hot air furnace; The plasma hot air furnace is used to plasma process the target exhaust gas to obtain a plasma hot air medium gas, wherein the target exhaust gas includes the first target exhaust gas and the second target exhaust gas; the plasma hot air medium gas is provided to the heating furnace. The heating furnace is used to provide a heat source during the heating stage of the target charcoal product processing using the plasma hot air medium gas, to heat the preheated charcoal product and obtain high-temperature exhaust gas with a fourth temperature and high-temperature charcoal product with a fourth temperature, wherein the fourth temperature is the preparation temperature that meets the preparation conditions of the high-temperature charcoal product; the high-temperature exhaust gas with the fourth temperature is used as a preheating heat source during the preheating stage of the target charcoal product processing to preheat the charcoal raw material product to be processed, to obtain preheated charcoal product and exhaust gas with a sixth temperature; the exhaust gas with the sixth temperature is discharged through the outlet of the heating furnace and then provided to the oleophobic dust removal equipment; The sixth temperature is lower than the fourth temperature.

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