Tar residue treatment system and treatment process thereof

Abstract

The present application belongs to the technical field of solid waste treatment, and specifically relates to a tar residue treatment system and a treatment process thereof. The present application effectively improves the energy utilization rate by utilizing the high-temperature hot gas generated in the pyrolysis process multiple times. After the pyrolysis is completed, part of the remaining high-temperature hot gas is sent to the combustion chamber for heating and then continues to be used in the pyrolysis process, and the other part is used for the secondary preheating and the primary preheating of the tar residue, so that the tar residue can reach the ideal preheating temperature before entering the continuous pyrolyzer, the heat energy is maximally recovered, and the energy waste is reduced. The pyrolysis process is carried out in a closed system, thereby reducing the emission of harmful gases. The remaining hot air is discharged after being treated by a desulfurization tower, thereby further reducing the influence on the environment. In addition, the non-condensable gas is sent back into the combustion chamber for combustion as fuel, thereby realizing the reuse of waste and reducing the emission of pollutants. The system is suitable for large-scale and continuous tar residue treatment, and can meet the needs of enterprises of different scales.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of solid waste treatment, and specifically relates to a tar residue treatment system and a treatment process thereof. BACKGROUND

[0002] With the rapid development of economy and the continuous advancement of industrialization process, the treatment and utilization of tar residue, an important industrial by-product, have increasingly attracted attention. Tar residue is mainly derived from the further processing and treatment of liquid by-products, coal tar, produced in the coal dry distillation process. Traditional tar residue treatment methods mainly include using as low-value fuel, reselling after reblending with coal, using as brick burning fuel or preparing activated carbon after extraction and centrifugation, etc.

[0003] However, these traditional methods have many problems: 1. Environmental pollution: Traditional tar residue treatment methods often accompany with a large amount of waste gas and wastewater discharge, causing serious pollution to the environment. For example, direct combustion of tar residue will produce a large amount of harmful gases such as sulfur dioxide and nitrogen oxides, which will have a serious impact on the atmospheric environment. 2. Resource waste: Tar residue contains rich organic matter and recyclable ingredients such as tar, gasoline and diesel. Traditional methods fail to fully recover these valuable resources, resulting in great waste of resources. 3. Low treatment efficiency: Traditional tar residue treatment methods usually have low efficiency and cannot realize large-scale and continuous treatment. This not only limits the treatment capacity but also increases the treatment cost. 4. Poor safety: In the treatment process, harmful substances in tar residue may pose a threat to human health. For example, carcinogenic substances such as polycyclic aromatic hydrocarbons in tar residue may be released into the environment during the treatment process, posing a risk to the health of operators and surrounding residents.

[0004] In recent years, tar residue pyrolysis technology has gradually become an emerging treatment method. Pyrolysis technology decomposes tar residue into gaseous products (such as tar and coal gas) and solid products (such as carbon particles) through high-temperature heating. This technology has the following advantages: High efficiency: Pyrolysis technology can quickly and efficiently decompose tar residue into a variety of useful substances, improving resource recovery rate. Environmental friendliness: The pyrolysis process can be carried out in a closed system, reducing the emission of harmful gases and reducing environmental pollution. Economic benefits: By recovering high-value-added products such as tar, gasoline, and diesel, the economic benefits of enterprises can be significantly improved. However, existing tar residue pyrolysis systems still have some shortcomings: Low energy utilization: The high-temperature hot gas generated during the pyrolysis process is often directly emitted, failing to fully utilize its heat and leading to energy waste. Poor preheating effect: Tar residue needs to be preheated before entering the pyrolyzer, but existing preheating equipment and methods are often inefficient, affecting the overall treatment effect. Complex process: Existing pyrolysis systems are usually complex in structure, difficult to maintain and operate, increasing operating costs. Therefore, there is an urgent need to develop an efficient tar residue treatment system and its processing technology to overcome the shortcomings of existing technologies, improve energy utilization, optimize preheating effects, and simplify the process flow, thereby achieving efficient, environmentally friendly, and economical treatment of tar residue.

[0005] In view of this, the present invention is hereby proposed. Summary of the Invention

[0006] The purpose of this invention is to overcome the shortcomings of the prior art and provide a tar residue treatment system and its treatment process.

[0007] To achieve the above objectives, the present invention provides the following technical solution:

[0008] On one hand, the present invention provides a tar residue treatment system, comprising:

[0009] The first preheating zone is where the tar residue is sent to a conical tank for initial preheating. The first preheating zone also includes a heat transfer oil coil installed inside the conical tank for heat tracing of the tar residue.

[0010] The second preheating zone is used to preheat the tar residue after the initial preheating. During the second preheating, a first gaseous product is generated. The first gaseous product is sent to a preheating cooler for cooling to obtain a first liquid product and non-condensable gas. The second preheating zone includes a drum-type preheater. Hot air is introduced into the outer cylinder of the preheater to heat the tar residue in the inner cylinder of the preheater.

[0011] The pyrolysis zone comprises a combustion chamber and a continuous pyrolyzer, the combustion chamber is connected to the outer cylinder of the continuous pyrolyzer, and the high-temperature hot gas generated by the mixed combustion of natural gas and air is sent to the outer cylinder of the continuous pyrolyzer; the second preheated tar residue is sent into the rotating inner cylinder of the continuous pyrolyzer, and the tar residue is pyrolyzed by the high-temperature hot gas in the outer cylinder of the continuous pyrolyzer, and the pyrolysis reaction finally converts the tar residue into a third gaseous product and a solid product; wherein, when the second preheated tar residue just enters the continuous pyrolyzer, the second gaseous product is gradually pyrolyzed in the inner cylinder of the continuous pyrolyzer, and the second gaseous product is sent to the front liquid separator cooler for cooling to obtain a second liquid product and non-condensable gas;

[0012] The discharge area is connected to the carbon powder bin, and the solid product generated after pyrolysis is sent to the discharge area by the discharge machine for cooling.

[0013] The coal tar processing zone is connected to the combustion chamber, and the third gaseous product generated during the pyrolysis process is cooled by the rear liquid separator cooler to obtain a third liquid product and non-condensable gas; the coal tar in the first liquid product, the second liquid product and the third liquid product is mixed and sent to the coal tar intermediate storage tank for further processing, and all the non-condensable gas is mixed and sent to the combustion chamber as fuel for combustion.

[0014] The hot air after the pyrolysis of the continuous pyrolyzer is partially sent to the combustion chamber for heating and then to the continuous pyrolyzer for pyrolysis of the tar residue, and the other part of the hot air is sent to the second preheating area for secondary preheating of the preliminary preheated tar residue, and the hot air after the secondary preheating is sent to the first preheating area for preheating of the heat transfer oil in the heat transfer oil coil through the flue gas heat exchanger, and the remaining hot air after the preheating is treated by the desulfurization tower and then discharged.

[0015] Specifically, the first preheating area comprises a conical tank, a heat transfer oil coil arranged in the conical tank, and a flue gas heat exchanger for heat exchange with the heat transfer oil coil, the flue gas heat exchanger is provided with a heat transfer oil spiral pipe connected with the heat transfer oil coil, the heat transfer oil spiral pipe is arranged in a circulating outer cylinder, the circulating outer cylinder is connected with the outer cylinder of the preheating machine at the gas inlet, and the circulating outer cylinder is connected with the desulfurization tower at the gas outlet, and the conical tank is connected with the inner cylinder of the preheating machine.

[0016] Specifically, the combustion chamber is further provided with a burner for mixing natural gas and air, and the natural gas is further depressurized by a pressure reducing station before entering the burner; the non-condensable gas combustible gas is directly sent to the burner.

[0017] Specifically, the hot air after the pyrolysis of the continuous pyrolyzer enters the flue gas adjusting tank through the heat recovery fan, and after the adjustment of the flue gas adjusting tank, part of the hot air enters the combustion chamber, and the other part of the hot air is sent to the outer cylinder of the preheating machine.

[0018] Specifically, the preheating cooler, the front liquid separation cooler and the rear liquid separation cooler have the same structure, and are all double-tower structures, comprising a first tower and a second tower, the first tower is a gaseous product cooling tower, and the second tower is a non-condensable gas extraction tower, the bottoms of the first tower and the second tower are communicated with a horizontal liquid storage tank, and a cooling liquid coil pipe for cooling gaseous products is arranged in the first tower; the horizontal liquid storage tank is communicated with a coal tar intermediate storage tank; each non-condensable gas extraction tower continuously extracts non-condensable gas in the tar residue treatment system, so that the tar residue treatment system is in a micro-negative pressure environment.

[0019] In another aspect, the present application provides a tar residue treatment process based on the above tar residue treatment system, comprising the following steps:

[0020] Step 1: The tar residue to be treated is sent to a conical tank, and initial preheating is performed by using a heat conducting oil coil pipe in the conical tank, and the heat conducting oil coil pipe is preheated by using the residual hot air waste heat of a preheating machine;

[0021] Step 2: The tar residue after initial preheating is sent to a drum-type preheating machine, and secondary preheating is performed by using the residual hot air waste heat of a continuous pyrolyzer; first gaseous products (oil-water mixed gas and non-condensable gas) generated by secondary preheating are sent to a preheating cooler for cooling, and first liquid products and non-condensable gas are obtained;

[0022] Step 3: The tar residue after secondary preheating is sent to a continuous pyrolyzer, and pyrolysis is performed by using high-temperature hot gas generated by combustion in a combustion chamber; during the pyrolysis process, part of second gaseous products is also generated in the inner cylinder of the continuous pyrolyzer, and the second gaseous products are sent to a front liquid separation cooler for cooling, and second liquid products and non-condensable gas are obtained; the pyrolysis reaction finally converts the tar residue into third gaseous products and solid products; at the same time, the hot air after the pyrolysis of the high-temperature hot gas is heated in the combustion chamber, and part of the hot air is continuously sent to the continuous pyrolyzer for pyrolysis of the tar residue, and the other part of the hot air is used for secondary preheating and initial preheating of the tar residue in sequence;

[0023] Step 4: The solid products generated after cooling are sent to a carbon powder storage bin by a discharging machine for storage; the third gaseous products generated are cooled by a rear liquid separation cooler, and third liquid products and non-condensable gas are obtained;

[0024] Step 5: The liquid products extracted from the first liquid products, the second liquid products and the third liquid products are sent to a coal tar intermediate storage tank for further treatment, and the non-condensable gas obtained is sent to the combustion chamber for combustion as fuel, and thus the treatment of the tar residue is completed.

[0025] Specifically, in step 3, the solid products are carbon particles.

[0026] Specifically, the first gaseous product includes a small amount of gaseous coal tar, a large amount of water vapor and non-condensable gas, the second gaseous product includes gaseous coal tar, a small amount of water vapor and non-condensable gas, and the third gaseous product includes a large amount of gaseous coal tar, a small amount of water vapor and non-condensable gas.

[0027] Specifically, the first liquid product includes a small amount of liquid coal tar and a large amount of water, the second liquid product includes liquid coal tar and a small amount of water, and the third liquid product includes a large amount of liquid coal tar and a small amount of water.

[0028] Specifically, the generated non-condensable gas is stabilized by a pressure stabilizing tank and then enters the combustion chamber.

[0029] Further, the design features of the tar residue treatment system of the present application will be described in detail below:

[0030] A. Energy-saving design

[0031] 1. Multi-stage recycling of waste heat

[0032] Heat transfer oil coil preheating innovation: In the first preheating area, the heat transfer oil coil in the conical tank uses the flue gas heat exchanger to exchange heat with the remaining hot air of the preheater to achieve preheating. This design ingeniously recycles the heat of the remaining hot air after the preheater works, which is used for the initial preheating of the tar residue, greatly improving the energy utilization rate. For example, the hot air (temperature about 270℃) discharged from the outer cylinder of the preheater enters the flue gas heat exchanger through the circulating outer cylinder, exchanges heat with the heat transfer oil in the heat transfer oil coil, heats the heat transfer oil to about 100℃, and then provides the heat required for the initial preheating of the tar residue in the conical tank, reducing the input of external energy and achieving the third efficient use of waste heat.

[0033] Full-process utilization of hot air circulation: The hot air (temperature about 530℃) after the completion of the continuous pyrolysis is an important energy carrier. Through the regenerative air blower, it is sent into the flue gas adjusting tank, and after adjustment, part of the hot air (temperature about 500℃) is sent to the combustion chamber to heat and then returned to the continuous pyrolysis device for pyrolysis, realizing the direct recycling of high-temperature hot air, reducing the demand for new fuel in the combustion chamber, and reducing energy consumption. Another part of the hot air (temperature about 400℃) is used for secondary preheating and initial preheating of the tar residue in turn, fully utilizing the waste heat of the hot air, making the energy utilization of the whole system form an organic cycle, and maximizing the reduction of heat loss, improving the comprehensive utilization rate of energy.

[0034] 2. Equipment optimization and energy saving

[0035] Preheating machine structure and efficiency improvement: The second preheating zone uses a drum-type preheating machine. The outer cylinder is connected to hot air to heat the tar residue in the inner cylinder. This design allows heat to be more evenly transferred to the tar residue, improving preheating efficiency and reducing heat loss during transmission. At the same time, the drum-type design facilitates the turning and mixing of tar residue during preheating, further enhancing heat transfer efficiency and reducing energy consumption.

[0036] Combustor optimization and energy efficient use: The combustor of the combustion chamber is subjected to pressure reduction treatment by the pressure reduction station before natural gas enters. This ensures that natural gas can enter the combustor at a stable pressure and mix with air to achieve more efficient combustion. By optimizing the combustion process, the efficiency of natural gas combustion is improved, reducing energy waste and providing a stable and efficient heat source for the entire system.

[0037] B, Carbon reduction measures

[0038] 1. Non-condensable gas recycling and carbon reduction

[0039] Efficient use of non-condensable gas as fuel: All non-condensable gas produced in the system is combined and sent to the combustion chamber to serve as fuel for combustion. Non-condensable gas is mainly composed of combustible gas, which is recovered and used for combustion, not only reducing pollution caused by direct emission of non-condensable gas to the environment, but also replacing part of the external fuel, thereby reducing the emission of greenhouse gases such as carbon dioxide generated by fuel combustion. For example, a large amount of non-condensable gas produced during pyrolysis is collected and pressure stabilized to become an important fuel source for the combustion chamber, achieving resource recycling and effective reduction of carbon emissions.

[0040] System optimization and indirect carbon reduction: Through the above energy-saving measures, such as efficient recovery and utilization of waste heat and optimized operation of equipment, the energy consumption of the entire system is significantly reduced. The reduction of energy consumption means that the emission of greenhouse gases such as carbon dioxide generated during production is correspondingly reduced, achieving the effect of indirect carbon reduction. In addition, the pyrolysis process is carried out in a closed system, reducing the leakage and emission of harmful gases, further reducing the carbon footprint on the environment.

[0041] 2. Clean energy selection and carbon reduction synergy

[0042] Application of natural gas as clean fuel: The combustion chamber uses natural gas as fuel, which produces relatively less carbon dioxide emissions compared to traditional fuels such as coal. The combustion process also significantly reduces the emission of harmful gases such as sulfur dioxide and nitrogen oxides. This choice reduces carbon emissions from the source and meets the trend of clean energy use, providing a guarantee for the low-carbonization of the entire tar residue treatment process.

[0043] C, Automation and continuous operation

[0044] 1. Automation control system

[0045] Precise parameter monitoring and regulation: The system is equipped with advanced automation control system, which can accurately monitor and control the operating parameters of each link in real time, such as temperature, pressure, flow, etc. Through the cooperation of sensors and controllers, it ensures the system to run in the best state. For example, in the processes of preheating, pyrolysis and cooling, accurate control of temperature is crucial to ensure the treatment effect and product quality. The automation system can automatically adjust the flow of heating source or cooling medium according to the preset temperature range, realize stable control of temperature, and improve the stability and consistency of production.

[0046] Device interlocking and intelligent control: Interlocking control is realized between devices, when a device fails or operates abnormally, the system can automatically start the corresponding protection measures and adjust the running state of other devices to ensure the continuity and stability of the whole production process. For example, if the temperature of the continuous pyrolyzer abnormally rises, the automation system will immediately stop feeding and adjust the working state of hot air flow and burner, and send an alarm to the operator for maintenance, avoiding the shutdown of the whole system due to local failure, improving the production efficiency and safety.

[0047] 2. Continuous production process

[0048] Seamless process flow: From the feeding of tar residue to the processing of final products, the whole process realizes continuous operation. The tar residue first enters the conical tank for primary preheating, then is transported to the roller preheater by the plunger pump for secondary preheating and oil-water separation, and then flows into the continuous pyrolyzer for pyrolysis reaction. The solid products after pyrolysis are cooled and sent to the carbon powder bin, and the gaseous products are cooled and separated to obtain coal tar and non-condensable gas, then the obtained products are stored and reused respectively. Each link is closely connected without interruption and pause, realizing large-scale and efficient tar residue treatment.

[0049] The core role of continuous pyrolyzer: As the core equipment of the system, the continuous pyrolyzer ensures the uninterrupted pyrolysis process of tar residue. The secondary preheated tar residue is continuously fed into the rotating inner cylinder of the continuous pyrolyzer, and the pyrolysis reaction is carried out in the stable high-temperature hot gas environment, constantly converting tar residue into useful gaseous and solid products. This continuous pyrolysis method not only improves the production efficiency, but also reduces the start-stop times of equipment, reduces energy consumption and equipment wear, and provides strong support for the efficient operation of the whole process.

[0050] D、Safety guarantee

[0051] 1. Precise pressure control and safety

[0052] Micro-negative pressure environment construction and maintenance: By continuously extracting non-condensable gas from the tar residue treatment system through the non-condensable gas extraction tower, the entire system is in a micro-negative pressure environment. This micro-negative pressure state can effectively prevent gas leakage, ensuring the safety of the production process. For example, in the preheating cooler, front fractionating cooler, rear fractionating cooler, and the entire treatment system, the micro-negative pressure environment avoids harmful gas leakage due to excessive pressure into the surrounding environment, posing a threat to the health of operators and surrounding residents. At the same time, for key parts such as the combustion chamber and continuous pyrolyzer, precise pressure control is also used to ensure that they operate within a safe pressure range.

[0053] Pressure interlocking and automatic adjustment: The system is equipped with control mechanisms such as full-pressure fan and pyrolysis machine internal negative pressure interlocking, and induced draft fan and furnace negative pressure interlocking. Through these interlocking devices, the control system can automatically adjust the air flow of the fan according to the set pressure value, maintaining the pressure stability of each part of the system. For example, the pressure of the continuous pyrolyzer outer cylinder is controlled by the induced draft fan at the hot air outlet, keeping it at a micro-negative pressure of about -120 Pa, ensuring the safe operation of the pyrolysis process. When the pressure fluctuates, the induced draft fan can automatically adjust the hot air flow to keep the pyrolyzer outer cylinder and combustion chamber in a micro-negative pressure state, preventing safety accidents caused by abnormal pressure.

[0054] 2. Combustion safety measures

[0055] Combustion safety design: The burner of the combustion chamber is equipped with a special mixing device to ensure that natural gas and air can be fully mixed before combustion. This design improves combustion efficiency and reduces harmful gases such as carbon monoxide produced by incomplete combustion. At the same time, natural gas is reduced in pressure by a pressure reduction station before entering the burner, stabilizing the pressure of the natural gas and ensuring the stability and safety of the combustion process, preventing safety accidents such as abnormal combustion or explosion caused by pressure fluctuations.

[0056] Non-condensable gas pressure stabilization and safe combustion: For the process of non-condensable gas going to the combustion chamber as fuel, a pressure stabilizing tank is set up for pressure stabilization. After pressure stabilization, non-condensable gas enters the combustion chamber at a stable pressure, ensuring smooth combustion and avoiding abnormal combustion or safety accidents caused by unstable pressure. In addition, the system is equipped with a complete flame monitoring and alarm device to monitor the combustion state in real time. Once abnormal combustion is detected, an alarm can be sent in time and appropriate measures can be taken to ensure the safety and reliability of the entire combustion process.

[0057] 3. Equipment safety protection and reliability

[0058] Structural design and material selection: Each device in the system, such as the conical tank, preheater, continuous pyrolyzer, etc., fully considers safety factors in structural design and material selection. The outer shell of the device is made of high-strength, corrosion-resistant materials that can withstand pressure and temperature changes during system operation, preventing equipment rupture or leakage. For example, the rotating inner and outer cylinders of the continuous pyrolyzer are made of special high-temperature and corrosion-resistant materials to ensure long-term stable operation under the action of high-temperature hot gas and tar residue.

[0059] Safety device configuration: Safety devices such as safety valves and explosion-proof membranes are installed at key locations of the equipment. When the internal pressure of the equipment exceeds the set value, these safety devices can act in time to release pressure, ensuring the safety of the equipment and personnel. For example, in the combustion chamber and pyrolyzer, where pressure may abnormally rise, safety valves can automatically open at critical moments to release excess pressure within a safe range, preventing equipment damage and safety accidents caused by overpressure.

[0060] Regular maintenance and inspection: Regular maintenance and inspection of equipment is an important measure to ensure safe operation of the system. A complete equipment maintenance plan and inspection system is developed to regularly check and maintain the performance, structural integrity, and safety devices of the equipment. For example, regular inspection of the sealing of the heat transfer oil coil, the wear of the hot air pipeline, and the working state of various valves and sensors can detect and handle potential safety hazards in time, ensuring that the performance and safety of the equipment are always in good condition. At the same time, training and management of operating personnel are strengthened to improve their safety awareness and operating skills, enabling them to correctly operate the equipment and handle emergencies in time, ensuring the safe operation of the system from both personnel and equipment aspects.

[0061] Further, the characteristics of the tar residue treatment process of the present application will be described in detail as follows:

[0062] A. Process steps

[0063] Initial preheating: The tar residue raw material is sent from the storage tank to the conical tank by the row of hoist grab bucket, and the initial preheating is carried out by the heat transfer oil coil in the conical tank. The heat transfer oil coil exchanges heat with the remaining hot air from the preheater through the flue gas heat exchanger, preheating the tar residue to 30-60℃. This process fully utilizes the waste heat after the preheater works, reducing energy consumption and providing suitable initial temperature conditions for subsequent processing steps.

[0064] Secondary preheating and oil-water separation: the tar residue after the primary preheating is sent to the drum-type preheater by the plunger pump for oil-water separation, and is preheated to 150-190°C by the residual hot air of the continuous pyrolyzer for secondary preheating, while rough evaporation is carried out to form heavy tar residue. The first gaseous product (including a small amount of gaseous coal tar, a large amount of water vapor and non-condensable gas) generated in the secondary preheating process enters the preheating cooler for cooling to obtain the first liquid product (a mixture of liquid coal tar and water) and non-condensable gas. This step not only realizes further preheating of the tar residue and improves its pyrolysis performance, but also preliminarily separates the water and part of the coal tar therein by oil-water separation, laying a foundation for subsequent pyrolysis and product processing.

[0065] Pyrolysis reaction and product generation: the heavy tar residue formed after the secondary preheating flows into the rotating inner cylinder of the continuous pyrolyzer (micro-negative pressure of about -20 Pa) to be pyrolyzed by the high-temperature hot gas (about 550°C) generated by the combustion of the combustion chamber. In the process of pyrolysis, the second gaseous product (including gaseous coal tar, a small amount of water vapor and non-condensable gas) is further pyrolyzed in the inner cylinder of the continuous pyrolyzer, which is led to the front liquid separation cooler for cooling to obtain the second liquid product (a mixture of liquid coal tar and water) and non-condensable gas. The pyrolysis reaction finally converts the tar residue into the third gaseous product (including a large amount of gaseous coal tar, a small amount of water vapor and non-condensable gas) and the solid product (carbon particles). At the same time, the hot air (about 530°C) formed after the high-temperature hot gas pyrolysis is extracted by the heat recovery machine and recycled, part of which is heated in the combustion chamber and then used for pyrolysis, and the other part is used for secondary preheating and primary preheating of the tar residue, realizing efficient recovery and utilization of heat energy.

[0066] B, product cooling and storage

[0067] Solid product processing: the carbon particles produced by pyrolysis are cooled by the rotating water-cooled coil (at normal pressure, the temperature is reduced to 50°C), and are sent to the carbon powder storage by the discharging machine. The cooled carbon particles can be used as high-quality fuel or for other industrial purposes, realizing the recycling of resources.

[0068] Gaseous product processing: the third gaseous product (a mixture of gaseous coal tar, water vapor and non-condensable gas) generated in the pyrolysis process is cooled by the rear liquid separation cooler to obtain liquid coal tar (50-90°C), water and non-condensable gas. The liquid coal tar in the first liquid product, the second liquid product and the third liquid product is combined and led to the coal tar intermediate storage tank for further processing, realizing the centralized recovery and subsequent deep processing and utilization of coal tar, and producing high-value oil products.

[0069] Non-condensable gas treatment and recycling: All the non-condensable gas generated in the system is combined and then pumped to the pressure stabilizing tank by the vacuum pump. After pressure stabilization, it is sent to the combustion chamber to serve as fuel for combustion. The recycling of non-condensable gas not only reduces energy waste and pollutant emissions, but also provides additional fuel for the combustion chamber, reducing the dependence on external fuel and improving the energy utilization efficiency and economic benefits of the entire system.

[0070] Further, the characteristics of the products obtained by treating the tar residue using the tar residue treatment process of the present application and the treatment optimization will be described in detail below:

[0071] A, gaseous products

[0072] Composition changes associated with pyrolysis process: During the pyrolysis process, the composition of gaseous products changes as the reaction progresses. The first gaseous product contains a small amount of gaseous coal tar, a large amount of water vapor, and non-condensable gas. This is because in the early stage of secondary preheating, a large amount of water in the tar residue evaporates, and a small amount of coal tar begins to volatilize to form a gas. As the pyrolysis proceeds, the gaseous coal tar content in the second gaseous product increases, and the water vapor content decreases. This is because in the further pyrolysis process in the inner cylinder of the continuous pyrolyzer, more coal tar is converted into gas, while water has already evaporated most of it in the early stage. In the later stage of the pyrolysis reaction, the third gaseous product includes a large amount of gaseous coal tar, a small amount of water vapor, and non-condensable gas. At this time, most of the organic matter in the tar residue has been converted into gaseous coal tar, and the water vapor content is very small.

[0073] Treatment method and resource recovery: The first gaseous product, the second gaseous product, and the third gaseous product are cooled by the preheating cooler, the front liquid separation cooler, and the rear liquid separation cooler, respectively. During the cooling process, gaseous coal tar will condense into liquid coal tar, which will be separated from water and non-condensable gas. The liquid products obtained after cooling are stored in the corresponding horizontal liquid storage tanks, and then combined into the coal tar intermediate storage tank for further processing and processing, such as distillation, fractionation, etc. to extract coal tar products of different qualities and uses, such as fuel oil, chemical raw materials, etc., realizing efficient recovery and resource utilization of gaseous coal tar. After collection and pressure stabilization, the non-condensable gas is sent to the combustion chamber as fuel for combustion, realizing the recycling of non-condensable gas, reducing energy waste and environmental pollution.

[0074] B, liquid products

[0075] Component changes and process effects: The first liquid product contains a small amount of liquid coal tar and a large amount of water, which is the result of oil-water separation in the early stage of secondary preheating. At this time, most of it is water, and the content of liquid coal tar is relatively small. With the advancement of the pyrolysis process, the content of liquid coal tar in the second liquid product increases, and the content of water decreases, reflecting the gradual enrichment of coal tar in the pyrolysis process. The third liquid product contains a large amount of liquid coal tar and a small amount of water, indicating that most of the water has been removed in the later stage of pyrolysis, and relatively pure liquid coal tar has been obtained.

[0076] Treatment and comprehensive utilization: The liquid coal tar in the first liquid product, the second liquid product and the third liquid product is combined and sent to the coal tar intermediate storage tank for further treatment. These liquid coal tar can be processed according to market demand and the requirements of subsequent processing technology to produce various high-value-added products such as high-quality fuel oil and chemical raw materials, etc., bringing significant economic benefits to the enterprise. At the same time, the water in the liquid product can be properly treated according to its water quality, such as reaching the standard for discharge or recycling, etc., realizing the rational utilization of water resources and environmental protection.

[0077] C, solid product

[0078] Characteristics and application value: The solid product produced by pyrolysis is mainly carbon particles, which have a high carbon content and a certain calorific value. The carbon particles after cooling can be used as high-quality fuel for industrial boilers and other equipment to provide stable heat supply for enterprises, replacing part of the traditional fuel and reducing energy costs. In addition, carbon particles can be further processed into activated carbon and other products for wastewater treatment, air purification and other fields, realizing diversified utilization of solid products and improving the economic and environmental benefits of the entire process.

[0079] In summary, the tar residue treatment system and its treatment process provided by the present application have significant advantages and innovations. In terms of energy saving, through multi-stage recycling of waste heat and optimization of equipment, the energy utilization rate is greatly improved, and energy consumption is reduced; in terms of carbon reduction, the recycling of non-condensable gas and the selection of clean energy effectively reduce carbon emissions, realizing sustainable utilization of resources and friendly protection of the environment; the design of automation and continuity ensures the stable operation and efficient production of the system, improving production efficiency and product quality; perfect safety protection measures ensure the safe and reliable operation of the system from pressure control, combustion safety and equipment protection. The system and process not only successfully solve many problems of traditional tar residue treatment methods, but also realize efficient, environmentally friendly and economic treatment of tar residue, have broad application prospects and promotion value, provide an advanced solution for the field of industrial solid waste treatment, meet the strategic requirements of current sustainable development, and have important significance for promoting the technological progress and environmental protection of the industry.

[0080] Compared with the prior art, the technical scheme provided by the present application has the following beneficial effects:

[0081] 1. Improve energy utilization: The tar residue treatment system is a continuous operation system, and the continuous operation of the system greatly reduces energy consumption. Moreover, the hot air waste heat generated in the pyrolysis process is utilized multiple times to effectively improve the energy utilization rate. After pyrolysis is completed, part of the remaining high-temperature hot air is sent to the combustion chamber for heating and then continues to be used in the pyrolysis process, and the other part of the hot air waste heat is used for secondary preheating and primary preheating of the tar residue, so that the tar residue can reach the ideal preheating temperature before entering the continuous pyrolyzer, the heat energy is maximally recovered, and energy waste is reduced.

[0082] 2. Reduce environmental pollution: The pyrolysis process is carried out in a closed system, reducing the emission of harmful gases. The remaining hot air is discharged after being treated by a desulfurization tower, further reducing the impact on the environment. In addition, the non-condensable gas is sent back into the combustion chamber as fuel for burning, realizing the reuse of waste and reducing the emission of pollutants.

[0083] 3. High safety: The non-condensable gas in the tar residue treatment system is continuously extracted by the non-condensable gas extraction tower, so that the entire tar residue treatment system is in a slightly negative pressure state, and gas leakage does not occur, making the production process safe.

[0084] 3. Improve economic benefits: By recycling coal tar, carbon particles and other high-value-added products, the economic benefits of enterprises can be significantly improved. These recycled coal tar and carbon particles can be further processed or sold, bringing additional income to the enterprise.

[0085] 4. Flexible processing capacity: The system is suitable for large-scale and continuous tar residue treatment and can meet the needs of enterprises of different scales. By adjusting the preheating temperature and pyrolysis conditions, different types of tar residue treatment can be adapted, improving the flexibility and applicability of the system.

[0086] 5. Reduce operating costs: By utilizing the high-temperature hot air generated in the pyrolysis process multiple times, external energy consumption is reduced. At the same time, the process flow and equipment maintenance are simplified, reducing the overall operating cost and improving the economic benefits of the enterprise.

[0087] In summary, the tar residue treatment system and its processing technology provided by the present application optimize the preheating effect, improve energy utilization, reduce environmental pollution, improve economic benefits and simplify the process flow, overcoming the shortcomings of the prior art and achieving efficient, environmentally friendly and economic treatment of tar residue. BRIEF DESCRIPTION OF DRAWINGS

[0088] The accompanying drawings, which are incorporated into and form part of the specification, illustrate the principles of the present application and, together with the description, serve to explain the present application.

[0089] In order to more clearly illustrate the technical solutions of the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, for those skilled in the field, other drawings can also be obtained based on these drawings without any creative effort.

[0090] Figure 1 The flow chart of the processing technology of the present application. DETAILED DESCRIPTION

[0091] The exemplary embodiments will be described in detail herein below with reference to the drawings. The following description refers to the accompanying drawings which show by way of example the exemplary embodiments of the present application. In the drawings, the same reference numerals in different drawings designate the same or similar elements unless otherwise indicated. The following exemplary embodiments described in the exemplary embodiments are not representative of all embodiments consistent with the present application. Rather, they are merely examples of apparatuses consistent with some aspects of the present application as detailed in the appended claims.

[0092] In order to make the technical solutions of the present application better understood by those skilled in the art, the present application will be further described in detail below with reference to the drawings and embodiments.

[0093] EMBODIMENT

[0094] Referring to Figure 1 As shown in the drawings, the present embodiment provides a tar residue treatment system, comprising:

[0095] The first preheating zone sends the tar residue to a conical tank for initial preheating, and further comprises a heat conducting oil coil arranged in the conical tank and used for heat tracing of the tar residue, which exchanges heat with the remaining hot air of the preheating machine by using a flue gas heat exchanger;

[0096] The second preheating zone preheats the tar residue after the initial preheating, and the second preheating produces a first gaseous product, which enters a preheating cooler to be cooled to obtain a first liquid product and non-condensable gas. The second preheating zone comprises a roller type preheating machine, and the outer cylinder of the preheating machine is connected to hot air to heat the tar residue in the inner cylinder of the preheating machine;

[0097] The pyrolysis zone comprises a combustion chamber and a continuous pyrolysis reactor, and the combustion chamber is connected to the outer cylinder of the continuous pyrolysis reactor to pass high-temperature hot gas produced by mixing and burning natural gas and air. The tar residue after the second preheating is sent into the rotating inner cylinder of the continuous pyrolysis reactor to be pyrolyzed by using the high-temperature hot gas in the outer cylinder of the continuous pyrolysis reactor, and the pyrolysis reaction finally converts the tar residue into a third gaseous product and a solid product. Wherein, when the tar residue after the second preheating enters the continuous pyrolysis reactor, the second gaseous product is gradually pyrolyzed in the inner cylinder of the continuous pyrolysis reactor, and the second gaseous product is connected to a front liquid separator cooler to be cooled to obtain a second liquid product and non-condensable gas.

[0098] an outlet area, the solid product generated after pyrolysis is sent to a carbon powder storage by an outlet machine of the outlet area after cooling;

[0099] a coal tar processing area, the third gaseous product generated during the pyrolysis process is cooled by the post-separation cooler to obtain a third liquid product and non-condensable gas; all the coal tar in the above-mentioned first liquid product, second liquid product and third liquid product is merged and sent to a coal tar intermediate storage tank for further processing, and all the non-condensable gas is merged and sent to a combustion chamber to serve as fuel for combustion;

[0100] the hot air after the pyrolysis of the continuous pyrolyzer is partially sent to the combustion chamber for heating and then to the continuous pyrolyzer for pyrolysis of the coal tar residue, and the other part is sent to the second preheating area for secondary preheating of the preliminarily preheated coal tar residue, the hot air after the secondary preheating is sent to the first preheating area, the heat transfer oil in the heat transfer oil coil is preheated by the flue gas heat exchanger, and the remaining hot air after the preheating is treated by the desulfurization tower and then discharged.

[0101] Specifically, the first preheating area comprises a conical tank, a heat transfer oil coil arranged in the conical tank, and a flue gas heat exchanger for heat exchange with the heat transfer oil coil, wherein the flue gas heat exchanger is provided with a heat transfer oil spiral pipe in communication with the heat transfer oil coil, the heat transfer oil spiral pipe is arranged in a circulating outer cylinder, an air inlet of the circulating outer cylinder is in communication with an outer cylinder of a preheating machine, an air outlet of the circulating outer cylinder is in communication with a desulfurization tower, and the conical tank is in communication with an inner cylinder of the preheating machine.

[0102] Specifically, the combustion chamber is further provided with a burner for mixing natural gas and air, and the natural gas is further depressurized by a pressure reduction station before entering the burner; the non-condensable gas is sent to the burner.

[0103] Specifically, the hot air after the pyrolysis of the continuous pyrolyzer enters the flue gas adjusting tank through a hot air recycling machine, a part of the hot air is sent to the combustion chamber after adjustment by the flue gas adjusting tank, and the other part is sent to the outer cylinder of the preheating machine.

[0104] Specifically, the preheating cooler, the front separation cooler and the post-separation cooler all have the same structure and are double-tower structures, comprising a first tower and a second tower, the first tower is a gaseous product cooling tower, and the second tower is a non-condensable gas extraction tower, the bottoms of the first tower and the second tower are in communication with a horizontal liquid storage tank, the first tower is provided with a cooling liquid coil for cooling gaseous products; the horizontal liquid storage tank is in communication with a coal tar intermediate storage tank; each non-condensable gas extraction tower continuously extracts non-condensable gas in the coal tar residue treatment system to maintain a micro-negative pressure environment in the coal tar residue treatment system.

[0105] The embodiment also provides a coal tar residue treatment process based on the above-mentioned coal tar residue treatment system, comprising the following steps:

[0106] Step 1, tar residue in the tar residue raw material storage tank is sent to the conical tank by the row of hoist grab bucket, and is preliminarily preheated (preheated to 30-60°C) by the heat conduction oil coil in the conical tank, which is preheated by the remaining hot air (about 270°C) of the preheating machine (preheated to about 100°C) ;

[0107] Step 2, the preliminarily preheated tar residue is sent to the roller type preheating machine by the plunger pump for oil-water separation, and is secondarily preheated (preheated to 150-190°C) by the remaining hot air of the continuous pyrolyzer, while rough evaporation is carried out, forming heavy tar residue; the first gaseous product (mixed gas of gaseous coal tar, water vapor and non-condensable gas) generated by secondary preheating enters the preheating cooler for cooling, obtaining the first liquid product (mixture of liquid coal tar and water) and non-condensable gas;

[0108] Step 3, the heavy tar residue formed after secondary preheating flows into the rotating inner cylinder of the continuous pyrolyzer (micro negative pressure-20 Pa or so), and is pyrolyzed by the high-temperature hot gas (about 550°C) generated by the combustion chamber (micro negative pressure-120 Pa or so); during the pyrolysis process, part of the second gaseous product (mixed gas of gaseous coal tar, water vapor and non-condensable gas) is also generated in the inner cylinder of the continuous pyrolyzer, which is led to the front liquid separation cooler for cooling, obtaining the second liquid product (mixture of liquid coal tar and water) and non-condensable gas; the pyrolysis reaction finally converts the tar residue into the third gaseous product (mixed gas of gaseous coal tar, water vapor and non-condensable gas) and the solid product (carbon particles); at the same time, the hot air (about 530°C) formed after the high-temperature hot gas pyrolysis is circulated after being extracted by the heat recovery fan, part of the hot air (about 500°C) is heated after being heated in the combustion chamber and then is led to the continuous pyrolyzer for pyrolyzing the tar residue, the other part of the hot air (about 400°C) is sequentially used for secondary preheating and rough evaporation separation of the tar residue, the remaining hot air (about 270°C) after secondary preheating is used for heating and heat exchange of the internal heat conduction oil coil by the flue gas heat exchanger (the temperature of the heat conduction oil after heat exchange is about 100°C), and is used for preliminary preheating (preheated to 30-60°C) of the tar residue in the conical tank, and the hot air (120°C) finally coming out of the flue gas heat exchanger is treated by the desulfurization tower (the temperature of the hot air is about 60°C) and then is discharged;

[0109] Step 4, the generated carbon particles are cooled by the rotating water cooling coil (normal pressure, cooled to 50°C), and are sent to the carbon powder storage by the discharging machine; the third gaseous product (mixed gas of gaseous coal tar and water vapor and non-condensable gas) is cooled by the rear liquid separation cooler, obtaining liquid coal tar (50-90°C), water and non-condensable gas;

[0110] Step 5, the extracted liquid coal tar in the first liquid product, the second liquid product and the third liquid product is sent to a coal tar intermediate storage tank for further processing, all non-condensable gas is combined and then pumped to a pressure stabilizing tank by a vacuum pump and sent to a combustion chamber for combustion as fuel, thus completing the processing of the tar residue.

[0111] Specifically, the first gaseous product includes a small amount of gaseous coal tar, a large amount of water vapor and non-condensable gas, the second gaseous product includes gaseous coal tar, a small amount of water vapor and non-condensable gas, and the third gaseous product includes a large amount of gaseous coal tar, a small amount of water vapor and non-condensable gas; the first liquid product includes a small amount of liquid coal tar and a large amount of water, the second liquid product includes liquid coal tar and a small amount of water, and the third liquid product includes a large amount of liquid coal tar and a small amount of water.

[0112] Specifically, the content of gaseous coal tar in the first gaseous product, the second gaseous product and the third gaseous product is higher and higher, and the content of water vapor is less and less during the pyrolysis process; the content of liquid coal tar in the first liquid product, the second liquid product and the third liquid product is higher and higher, and the content of water is less and less, and finally the obtained carbon powder has a very small amount of coal tar and water, so that the carbon powder meets the conditions for reuse.

[0113] Specifically, the heat conducting oil spiral pipe in the flue gas heat exchanger is in communication with the heat conducting oil coil, the gas outlet of the circulating outer cylinder is in communication with the desulfurization tower, the gas inlet of the circulating outer cylinder is in communication with the gas outlet of the preheater, and the gas inlet of the preheater is in communication with the flue gas adjusting tank; the discharge outlet of the conical tank is in communication with the feed inlet of the preheater through the plunger pump, the discharge outlet of the preheater is in communication with the feed inlet of the continuous pyrolyzer, and the feed inlet of the continuous pyrolyzer is further connected with a front liquid separator cooler for cooling the oil gas generated by the tar residue after secondary preheating; the carbon powder discharge outlet of the continuous pyrolyzer is sequentially connected with a rotary water cooling coil, a discharge machine and a carbon powder bin, the oil gas discharge outlet of the continuous pyrolyzer is connected with a rear liquid separator cooler, and the front liquid separator cooler and the liquid separator cooler are both in communication with a coal tar intermediate storage tank, wherein the non-condensable gas is pumped to a pressure stabilizing tank by a vacuum pump and sent to a combustion chamber for combustion treatment; the coal tar intermediate storage tank is finally connected to an oil product tank area for subsequent oil product sales; and the carbon powder in the carbon powder bin is subsequently loaded for sale.

[0114] Specifically, the tar residue processing channel in the tar residue processing system is monitored in real time by the control system for internal pressure, and the tar residue processing system is kept in a constant micro-negative pressure state by controlling the exhaust rate of the non-condensable gas exhaust tower.

[0115] The pressure of the continuous pyrolyzer outer cylinder in the tar residue treatment system is about -120 Pa, which is realized by setting a regenerative air blower at the hot air outlet of the continuous pyrolyzer. The control system adjusts the size of the regenerative air blower to make the pyrolyzer outer cylinder and the combustion chamber in a micro negative pressure by monitoring the real-time internal pressure of the pyrolyzer outer cylinder.

[0116] The above description is merely a specific implementation of the application, which enables those skilled in the art to understand or implement the application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the application.

[0117] It should be understood that the present application is not limited to the above-described and described, and various modifications and changes can be made without departing from the scope thereof. The scope of the present application is limited only by the appended claims.

Claims

1. A tar residue treatment system, characterized in that, include: The first preheating zone is where the tar residue is sent to a conical tank for initial preheating. The first preheating zone also includes a heat transfer oil coil installed inside the conical tank for heat tracing of the tar residue. The first preheating zone includes a conical tank, a heat transfer oil coil installed inside the conical tank, and a flue gas heat exchanger that exchanges heat with the heat transfer oil coil. The flue gas heat exchanger is equipped with a heat transfer oil spiral tube connected to the heat transfer oil coil. The heat transfer oil spiral tube is installed inside the outer circulation cylinder. The air inlet of the outer circulation cylinder is connected to the outer cylinder of the preheater, and the air outlet of the outer circulation cylinder is connected to the desulfurization tower. The conical tank is connected to the inner cylinder of the preheater. The second preheating zone is used to preheat the tar residue after the initial preheating. During the second preheating, a first gaseous product is generated. The first gaseous product is sent to a preheating cooler for cooling to obtain a first liquid product and non-condensable gas. The second preheating zone includes a drum-type preheater. Hot air is introduced into the outer cylinder of the preheater to heat the tar residue in the inner cylinder of the preheater. The pyrolysis zone includes a combustion chamber and a continuous pyrolysis unit. The combustion chamber transmits the high-temperature hot gas generated by the combustion of natural gas and air to the outer cylinder of the continuous pyrolysis unit. The preheated tar residue is fed into the rotating inner cylinder of the continuous pyrolysis unit, where it is pyrolyzed using the high-temperature hot gas in the outer cylinder. The pyrolysis reaction ultimately converts the tar residue into a third gaseous product and a solid product. When the preheated tar residue first enters the continuous pyrolysis unit, it gradually begins to pyrolyze into a second gaseous product in the inner cylinder. The second gaseous product is then cooled by a pre-liquid separator to obtain a second liquid product and non-condensable gas. In the discharge area, the solid products generated after pyrolysis are cooled and then sent to the carbon powder silo by the discharge machine in the discharge area; In the coal tar processing area, the third gaseous product generated during pyrolysis is cooled by the post-liquid separator to obtain the third liquid product and non-condensable gas. The coal tar in the first, second, and third liquid products obtained above is combined and then sent to the intermediate coal tar storage tank for further processing. All the non-condensable gas is combined and then sent to the combustion chamber to be used as fuel for combustion. After the continuous pyrolysis is completed, part of the hot air is sent to the combustion chamber for heating and then continues to the continuous pyrolysis unit to pyrolyze the tar residue. The other part of the hot air is sent to the second preheating zone, where the waste heat of the hot air is used to preheat the tar residue that has been preheated in the first stage. After the second preheating, the hot air is sent to the first preheating zone, where the waste heat of the hot air is used to preheat the heat transfer oil in the heat transfer oil coil through the flue gas heat exchanger. The remaining hot air after preheating is treated by the desulfurization tower and then discharged. The preheating cooler, the front liquid separator, and the rear liquid separator all have the same structure, which is a double-tower structure, including a first tower and a second tower. The first tower is a gaseous product cooling tower, and the second tower is a non-condensable gas extraction tower. The bottom of the first tower and the second tower are connected to a horizontal liquid storage tank. The first tower is equipped with a cooling liquid coil for cooling the gaseous product. Each of the non-condensable gas extraction towers continuously extracts non-condensable gas from the tar residue treatment system, so that the tar residue treatment system is in a slightly negative pressure environment.

2. The tar residue treatment system according to claim 1, characterized in that, The combustion chamber is also equipped with a burner for mixing natural gas and air, and the natural gas is depressurized by a pressure reducing station before entering the burner; the non-condensable gas is led to the burner.

3. The tar residue treatment system according to claim 1, characterized in that, After the continuous pyrolysis is completed, the hot air enters the flue gas regulating box through the regenerating fan. After being regulated by the flue gas regulating box, part of the hot air enters the combustion chamber, and the other part of the hot air goes to the outer cylinder of the preheater.

4. The tar residue treatment process based on the tar residue treatment system according to any one of claims 1-3, characterized in that, Includes the following steps: Step 1: The tar residue to be processed is sent to a conical tank and preheated using the heat transfer oil coil inside the conical tank. The heat transfer oil coil is preheated using the residual hot air from the preheater. Step 2: The tar residue after the initial preheating is sent to a drum-type preheater and preheated again using the residual hot air heat from the continuous pyrolysis unit; the first gaseous product generated by the secondary preheating enters the preheating cooler for cooling to obtain the first liquid product and non-condensable gas. Step 3: The tar residue after secondary preheating is sent to a continuous pyrolyzer, where it is pyrolyzed using the high-temperature hot gas generated by combustion in the combustion chamber. During the pyrolysis process, some second gaseous products are also generated in the inner cylinder of the continuous pyrolyzer. The second gaseous products are cooled by the pre-liquid separator to obtain a second liquid product and non-condensable gas. The pyrolysis reaction eventually converts the tar residue into a third gaseous product and a solid product. At the same time, after the high-temperature hot gas has completed pyrolysis, part of the hot air is sent to the combustion chamber for heating and then continues to the continuous pyrolyzer to pyrolyze the tar residue. The residual heat of the other part of the hot air is used to perform secondary preheating and primary preheating of the tar residue in sequence. Step 4: The generated solid product is cooled and then sent to the toner silo for storage by the discharge machine; the generated third gaseous product is cooled by the post-liquid separator to obtain the third liquid product and non-condensable gas. Step 5: The liquid coal tar extracted from the first liquid product, the second liquid product, and the third liquid product is sent to the intermediate coal tar storage tank for further processing. All the non-condensable gases obtained are sent to the combustion chamber to be used as fuel for combustion. This completes the processing of the tar residue.

5. The tar residue treatment process according to claim 4, characterized in that, In step 3, the solid product is carbon particles.

6. The tar residue treatment process according to claim 4, characterized in that, The first gaseous product includes a small amount of gaseous coal tar, a large amount of water vapor, and non-condensable gases; the second gaseous product includes gaseous coal tar, a small amount of water vapor, and non-condensable gases; and the third gaseous product includes a large amount of gaseous coal tar, a trace amount of water vapor, and non-condensable gases.

7. The tar residue treatment process according to claim 4, characterized in that, The first liquid product includes a small amount of liquid coal tar and a large amount of water; the second liquid product includes liquid coal tar and a small amount of water; and the third liquid product includes a large amount of liquid coal tar and a trace amount of water.

8. The tar residue treatment process according to claim 4, characterized in that, The generated non-condensable gas is pressure-stabilized in a pressure stabilizing tank before entering the combustion chamber.

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