Tar residue treatment system and treatment process thereof

Abstract

The invention belongs to the technical field of solid waste treatment, and particularly relates to a tar residue treatment system and a treatment process thereof. High-temperature hot gas generated in the pyrolysis process is utilized for multiple times, and the energy utilization rate is effectively increased. One part of residual high-temperature hot gas after pyrolysis is completed is sent to the combustion chamber to be heated and then is continuously used for the pyrolysis process, and the other part of the residual high-temperature hot gas is used for secondary preheating and primary preheating of the tar residue, so that the tar residue can reach an ideal preheating temperature before entering the continuous pyrolyzer, heat energy is recycled to the maximum extent, and energy waste is reduced. The pyrolysis process is carried out in a closed system, and emission of harmful gas is reduced. And residual hot air is discharged after being treated by the desulfurizing tower, so that the influence on the environment is further reduced. In addition, the non-condensable gas serves as fuel to be fed into the combustion chamber again to be combusted, waste recycling is achieved, and pollutant emission is reduced. The system is suitable for large-scale and continuous tar residue treatment, and can meet the requirements of enterprises with different scales.

Description

Technical Field

[0001] The invention belongs to the technical field of solid waste treatment, and in particular relates to a tar residue treatment system and a treatment process thereof. Background Art

[0002] With the rapid development of economy and the continuous advancement of industrialization, the treatment and utilization of tar residue as an important industrial by-product has attracted increasing attention. Tar residue mainly comes from the further processing and treatment of coal tar, a liquid by-product produced during coal distillation. Traditional tar residue treatment methods mainly include using it as a low-value fuel, re-blending coal for sale, extracting and centrifuging it for use as a brick burning fuel or preparing activated carbon, etc.

[0003] However, these traditional methods have many problems: 1. Environmental pollution: Traditional tar residue treatment methods are often accompanied by 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, nitrogen oxides, etc., which have a serious impact on the atmospheric environment. 2. Waste of resources: Tar residue contains rich organic matter and recyclable components, such as tar, gasoline, diesel, etc. Traditional methods have failed to fully recycle these valuable resources, resulting in a great waste of resources. 3. Low treatment efficiency: Traditional tar residue treatment methods are usually inefficient and cannot achieve large-scale and continuous treatment. This not only limits the treatment capacity, but also increases the treatment cost. 4. Poor safety: During the treatment process, harmful substances in tar residue may pose a threat to human health. For example, carcinogens 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 is to decompose tar residue into gaseous products (such as tar, coal gas, etc.) and solid products (such as carbon particles) by 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 the recovery rate of resources. Environmental protection: The pyrolysis process can be carried out in a closed system, reducing the emission of harmful gases and reducing environmental pollution. Economic benefits: By recycling high-value-added products such as tar, gasoline, and diesel, the economic benefits of the enterprise can be significantly improved. However, the existing tar residue pyrolysis system still has some shortcomings: Low energy utilization: The high-temperature hot gas generated during the pyrolysis process is often directly discharged, and its heat is not fully utilized, resulting in energy waste. Poor preheating effect: Tar residue needs to be preheated before entering the pyrolyzer, but the existing preheating equipment and methods are often inefficient, affecting the overall treatment effect. Complex process: The existing pyrolysis system is usually complex in structure, difficult to maintain and operate, and increases the operating cost. Therefore, it is urgent to develop an efficient tar residue treatment system and its treatment process to overcome the shortcomings of the existing technology, improve energy utilization, optimize the preheating effect, and simplify the process flow, so as to achieve efficient, environmentally friendly and economical treatment of tar residue.

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

[0006] The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a tar residue treatment system and a treatment process thereof.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] In one aspect, the present invention provides a tar residue processing system, comprising:

[0009] The first preheating zone is used to send the tar residue to the conical tank for initial preheating. The first preheating zone also includes a heat transfer oil coil disposed in the conical tank and used for heating the tar residue.

[0010] The second preheating zone is used to perform secondary preheating on the tar slag after the initial preheating. The first gaseous product is produced during the secondary preheating. The first gaseous product is sent to the 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 slag in the inner cylinder of the preheater.

[0011] The pyrolysis zone includes a combustion chamber and a continuous pyrolyzer, wherein the combustion chamber passes the high-temperature hot gas generated by the mixed combustion of natural gas and air to the outer cylinder of the continuous pyrolyzer; the tar residue preheated for the second time is fed into the rotating inner cylinder of the continuous pyrolyzer, and 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 tar residue preheated for the second time just enters the continuous pyrolyzer, it gradually begins to pyrolyze in the inner cylinder of the continuous pyrolyzer to produce a second gaseous product, and the second gaseous product is passed to the front liquid separation cooler for cooling to obtain a second liquid product and a non-condensable product;

[0012] In the discharging area, the solid product produced after pyrolysis is cooled and sent to the carbon powder silo by the discharging machine in the discharging area;

[0013] In the coal tar processing area, the third gaseous product generated during the pyrolysis process is cooled by the post-liquid separation cooler to obtain the third liquid product and non-condensable gas; the coal tar in the first liquid product, the second liquid product, and the third liquid product obtained above are combined and sent to the coal tar intermediate storage tank for further processing, and all the non-condensable gases are combined and sent to the combustion chamber to serve as fuel for combustion;

[0014] After the pyrolysis in the continuous pyrolyzer is completed, 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, and the other part of the hot air is sent to the second preheating zone, and the waste heat of the hot air is used to preheat the initially preheated tar residue for a second time. After the second preheating, the hot air is sent to the first preheating zone, and 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 in the desulfurization tower and then discharged.

[0015] Specifically, the first preheating zone includes 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 to the heat transfer oil coil. The heat transfer oil spiral pipe is arranged in a circulating outer cylinder. The air inlet of the circulating outer cylinder is connected to the outer cylinder of the preheater, the air outlet of the circulating outer cylinder is connected to the desulfurization tower, and the conical tank is connected to the inner cylinder of the preheater.

[0016] Specifically, the combustion chamber is also provided with a burner for mixing natural gas and air. The natural gas is decompressed through a decompression station before entering the burner; the non-condensable combustible gas directly flows to the burner.

[0017] Specifically, the hot air after pyrolysis in the continuous pyrolyzer enters the flue gas conditioning box through the heat recovery fan. After being regulated by the flue gas conditioning box, part of the hot air enters the combustion chamber, and the other part of the hot air flows to the outer cylinder of the preheater.

[0018] Specifically, the structures of the preheating cooler, the front liquid separation cooler, and the rear liquid separation cooler are the same, all of which are double-tower structures, 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 bottoms of the first tower and the second tower are connected to a horizontal liquid storage tank, and the first tower is provided with a coolant coil for cooling the gaseous product; the horizontal liquid storage tank is connected to a coal tar intermediate storage tank; each of the non-condensable gas extraction towers continuously extracts non-condensable gas in the tar residue treatment system, so that the tar residue treatment system is in a slightly negative pressure environment.

[0019] On the other hand, the present invention provides a tar residue treatment process based on the above tar residue treatment system, comprising the following steps:

[0020] Step 1, sending the tar residue to be treated to a conical tank, and using the heat transfer oil coil in the conical tank for initial preheating, wherein the heat transfer oil coil is preheated using the residual hot air and waste heat of the preheating machine;

[0021] Step 2: Send the tar residue after the initial preheating to a drum-type preheater, and use the residual hot air and waste heat of the continuous pyrolyzer for secondary preheating; the first gaseous product (oil-water mixed gas and non-condensable gas) generated by the secondary preheating enters the preheating cooler for cooling to obtain the first liquid product and non-condensable gas;

[0022] Step 3, the tar residue after the secondary preheating is sent to the continuous pyrolyzer, and the high-temperature hot gas generated by the combustion in the combustion chamber is used for pyrolysis. During the pyrolysis process, part of the second gaseous product is also generated in the inner cylinder of the continuous pyrolyzer, and the second gaseous product is sent to the front liquid separation cooler for cooling to obtain a second liquid product and non-condensable gas; the pyrolysis reaction finally converts the tar residue into a third gaseous product and a solid product; at the same time, a part of the hot air after the high-temperature hot gas pyrolysis is sent to the combustion chamber for heating and then continues to be sent to the continuous pyrolyzer to pyrolyze the tar residue, and the waste heat of the other part of the hot air is used to perform secondary preheating and primary preheating on the tar residue in sequence;

[0023] Step 4: After the solid product is cooled, it is sent to the carbon powder bin for storage by the discharging machine; the third gaseous product is cooled by the post-liquid separation cooler to obtain the third liquid product and non-condensable gas;

[0024] Step 5: The liquid product extracted from the first liquid product, the second liquid product and the third liquid product is sent to the coal tar intermediate storage tank for further processing, and the obtained non-condensable gas is sent to the combustion chamber to serve as fuel for combustion, thereby completing the processing of the tar residue.

[0025] Specifically, in step 3, the solid product is 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 trace 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 trace amount of water.

[0028] Specifically, the generated non-condensable gas is passed through the pressure stabilization tank and then flows into the combustion chamber.

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

[0030] A. Energy-saving design

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

[0032] Innovation in preheating of thermal oil coils: In the first preheating area, the thermal oil coils in the conical tank use the flue gas heat exchanger to exchange heat with the remaining hot air of the preheater to achieve preheating. This design cleverly recycles the remaining hot air heat after the preheater is working, and uses it for the initial preheating of tar slag, greatly improving the energy utilization rate. For example, the hot air (temperature of about 270°C) discharged from the outer cylinder of the preheater enters the flue gas heat exchanger through the circulating outer cylinder, and exchanges heat with the thermal oil in the thermal oil spiral tube, heating the thermal oil to about 100°C, thereby providing the heat required for the initial preheating of the tar slag in the conical tank, reducing the input of external energy, and realizing the third efficient utilization of waste heat.

[0033] Full-process utilization of hot air circulation: The hot air (temperature of about 530°C) after the continuous pyrolyzer pyrolysis is an important energy carrier. It is sent to the flue gas conditioning box through the heat recovery fan. After conditioning, a part of the hot air (temperature of about 500°C) is sent to the combustion chamber for heating and then returns to the continuous pyrolyzer to pyrolyze the tar residue, realizing the direct recycling of high-temperature hot air, reducing the demand for new fuel in the combustion chamber and reducing energy consumption. The other part of the hot air (temperature of about 400°C) is used for secondary preheating and primary preheating of the tar residue in turn, making full use of the waste heat of the hot air, so that the energy utilization of the entire system forms an organic cycle, minimizing heat loss and improving the comprehensive utilization rate of energy.

[0034] 2. Equipment optimization and energy saving synergy

[0035] Improved preheater structure and efficiency: The second preheating zone uses a drum preheater, whose outer drum is heated by hot air to heat the tar residue in the inner drum. This structural design allows heat to be transferred to the tar residue more evenly, improves preheating efficiency, and reduces heat loss during the transfer process. At the same time, the drum design is conducive to the turning and mixing of the tar residue during the preheating process, further enhancing the heat transfer effect, thereby utilizing heat in a more efficient way and reducing energy consumption.

[0036] Burner optimization and efficient energy utilization: The burners in the combustion chamber are decompressed by the decompression station before the natural gas enters. This measure ensures that the natural gas can enter the burner at a stable pressure and achieve more efficient combustion after being fully mixed with the air. By optimizing the combustion process, the combustion efficiency of natural gas is improved, energy waste is reduced, and a stable and efficient heat source is provided 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 gases generated in the system are combined and directed to the combustion chamber to act as fuel for combustion. Non-condensable gas is mainly composed of combustible gas. Recycling it and using it for combustion not only reduces the pollution caused by direct emission of non-condensable gas to the environment, but also replaces the use of some external fuels, thereby reducing greenhouse gas emissions such as carbon dioxide generated by fuel combustion. For example, a large amount of non-condensable gas generated during the pyrolysis process becomes an important fuel source for the combustion chamber after being collected and pressure-stabilized, realizing the recycling of resources 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 in energy consumption means that greenhouse gas emissions such as carbon dioxide generated during the production process are correspondingly reduced, achieving the effect of indirect carbon reduction. In addition, the pyrolysis process is carried out in a closed system, which reduces the leakage and emission of harmful gases and further reduces 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. Compared with traditional fuels such as coal, the carbon dioxide emissions generated by natural gas combustion are relatively small, and harmful gases such as sulfur dioxide and nitrogen oxides generated during the combustion process are also greatly reduced. This choice reduces carbon emissions from the source, conforms to the trend of clean energy utilization, and provides a guarantee for the low-carbonization of the entire tar residue treatment process.

[0043] C. Automation and Continuity

[0044] 1.Automation control system

[0045] Precise parameter monitoring and control: The system is equipped with an advanced automatic control system that can accurately monitor and control the operating parameters of each link in real time, such as temperature, pressure, flow, etc. The coordinated work of sensors and controllers ensures that the system operates in the best state. For example, in the process of preheating, pyrolysis and cooling, precise temperature control is essential to ensure the treatment effect and product quality. The automation system can automatically adjust the flow of the heating source or cooling medium according to the preset temperature range to achieve stable temperature control, thereby improving the stability and consistency of production.

[0046] Equipment interlocking and intelligent control: Interlocking control is implemented between various devices. When a device fails or operates abnormally, the system can automatically start the corresponding protection measures and adjust the operating status of other devices to ensure the continuity and stability of the entire production process. For example, if the temperature of the continuous pyrolyzer rises abnormally, the automation system will immediately stop feeding, adjust the hot air flow and the working status of the burner, and issue an alarm to notify the operator to carry out maintenance, avoiding the shutdown of the entire system due to local failures and improving production efficiency and safety.

[0047] 2. Continuous production process

[0048] Seamless process flow: From the feeding of tar residue to the processing of the final product, the entire process is operated continuously. The tar residue first enters the conical tank for initial preheating, and then is transported to the drum preheater by a plunger pump for secondary preheating and oil-water separation. Then it flows into the continuous pyrolyzer for pyrolysis reaction. The solid product after pyrolysis is sent to the carbon powder silo after cooling. The gaseous product is cooled and separated to obtain coal tar and non-condensable gas, and 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 function of the continuous pyrolyzer: As the core equipment of the system, the continuous operation of the continuous pyrolyzer ensures the uninterrupted pyrolysis process of the tar residue. The tar residue preheated for the second time is continuously fed into the rotating inner cylinder of the continuous pyrolyzer, where it undergoes pyrolysis reaction in a stable high-temperature hot gas environment, continuously converting the tar residue into useful gaseous and solid products. This continuous pyrolysis method not only improves production efficiency, but also reduces the number of equipment starts and stops, reduces energy consumption and equipment wear, and provides strong support for the efficient operation of the entire process.

[0050] D. Security

[0051] 1.Precise pressure control and safety

[0052] Construction and maintenance of micro-negative pressure environment: The non-condensable gas in the tar residue treatment system is continuously extracted through the non-condensable gas extraction tower, so that the entire system is in a micro-negative pressure environment. This micro-negative pressure state can effectively prevent gas leakage and ensure the safety of the production process. For example, in the preheating cooler, the front liquid separation cooler, the rear liquid separation cooler and the entire treatment system, the micro-negative pressure environment prevents harmful gases from leaking into the surrounding environment due to excessive pressure, 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 interlock and automatic adjustment: The system is equipped with control mechanisms such as the interlock between the full-pressure fan and the negative pressure in the pyrolyzer, and the interlock between the induced draft fan and the negative pressure in the furnace. Through these interlocking devices, the control system can automatically adjust the exhaust flow of the fan according to the set pressure value to maintain the pressure stability of each part of the system. For example, the pressure of the outer cylinder of the continuous pyrolyzer is controlled by the induced draft fan set at the hot air outlet to keep it at a slight negative pressure of about -120Pa, ensuring the safety of the pyrolysis process. When the pressure fluctuates, the induced draft fan can automatically adjust the size of the hot air extraction flow rate, so that the outer cylinder of the pyrolyzer and the combustion chamber are always in a slight negative pressure state, preventing safety accidents caused by abnormal pressure.

[0054] 2. Combustion safety measures

[0055] Burner safety design: The burner in 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, the natural gas is decompressed through a decompression station before entering the burner, which stabilizes the pressure of the natural gas, ensures the stability and safety of the combustion process, and prevents 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 entering the combustion chamber as fuel, a pressure stabilization tank is set up for pressure stabilization. After the pressure stabilization, the non-condensable gas enters the combustion chamber at a stable pressure for combustion, ensuring the smooth progress of the combustion process and avoiding abnormal combustion or safety accidents caused by unstable pressure. In addition, the system is also equipped with a complete flame monitoring and alarm device to monitor the combustion status in real time. Once a combustion abnormality is found, an alarm can be issued in time and corresponding 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., has taken safety factors into full consideration in structural design and material selection. The shell of the equipment is made of high-strength, corrosion-resistant materials, which can withstand the pressure and temperature changes during the operation of the system and prevent the equipment from breaking or leaking. 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 parts of the equipment. When the internal pressure of the equipment exceeds the set value, these safety devices can be activated in time to release the pressure and ensure the safety of the equipment and personnel. For example, in parts such as the combustion chamber and pyrolyzer where abnormal pressure may rise, the safety valve can automatically open at a critical moment to release the excess pressure within a safe range to prevent the equipment from being damaged due to overpressure and causing safety accidents.

[0060] Regular maintenance and inspection: Regular maintenance and inspection of equipment is an important measure to ensure the safe operation of the system. A comprehensive equipment maintenance plan and inspection system have been formulated to regularly inspect and maintain the performance, structural integrity and safety devices of the equipment. For example, the sealing of the thermal oil coil, the wear of the hot air duct, and the working status of various valves and sensors are regularly checked to promptly discover and deal with potential safety hazards and ensure that the performance and safety of the equipment are always in good condition. At the same time, the training and management of operators are strengthened to improve their safety awareness and operating skills so that they can operate the equipment correctly and deal with emergencies in a timely manner, thus jointly 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 invention will be described in detail below:

[0062] A. Process steps

[0063] Initial preheating: The tar slag raw material is sent from the storage tank to the conical tank through the crane grab, and the thermal oil coil in the conical tank is used for initial preheating. The thermal oil coil exchanges heat with the residual hot air of the preheater through the flue gas heat exchanger to preheat the tar slag to 30-60℃. This process makes full use of the residual heat after the preheater works, reduces energy consumption, and provides suitable initial temperature conditions for subsequent processing steps.

[0064] Secondary preheating and oil-water separation: The tar residue after the initial preheating is sent to a drum-type preheater through a plunger pump for oil-water separation, and is preheated to 150-190°C for the second time using the residual hot air from the continuous pyrolyzer, and crude evaporation is performed at the same time 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) produced during 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 achieves further preheating of the tar residue and improves its pyrolysis performance, but also preliminarily separates the water and part of the coal tar through oil-water separation, laying the 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 (slightly negative pressure of about -20Pa) by gravity, and is pyrolyzed using the high-temperature hot gas (about 550°C) generated by the combustion in the combustion chamber. During the pyrolysis process, the second gaseous product (including gaseous coal tar, a small amount of water vapor and non-condensable gas) will be further pyrolyzed in the inner cylinder of the continuous pyrolyzer. The second gaseous product is cooled by the front liquid cooler to obtain the second liquid product (a mixture of liquid coal tar and water) and non-condensable gas. The pyrolysis reaction eventually converts the tar residue into a third gaseous product (including a large amount of gaseous coal tar, a small amount of water vapor and non-condensable gas) and a solid product (carbon particles). At the same time, the hot air (about 530°C) formed after the high-temperature hot gas pyrolysis is completed is extracted by the heat recovery fan and recycled. A part of the hot air is heated and heated in the combustion chamber and then continued to be used for pyrolysis, and the other part is used for the secondary preheating and primary preheating of the tar residue in turn, realizing the 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 a rotating water-cooling coil (normal pressure, cooled to 50°C) and then sent to the carbon powder silo for 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) produced during the pyrolysis process is cooled in the post-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 are all combined and sent to the coal tar intermediate storage tank for further processing, realizing the centralized recovery and subsequent deep processing of coal tar, and producing high value-added oil products.

[0069] Non-condensable gas treatment and recycling: All non-condensable gases generated in the system are collected and pumped to the pressure stabilizing tank by a vacuum pump, and then sent to the combustion chamber to act as fuel for combustion after pressure stabilization. The recycling of non-condensable gas not only reduces energy waste and pollutant emissions, but also provides additional fuel for the combustion chamber, reduces dependence on external fuel, and improves the energy efficiency and economic benefits of the entire system.

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

[0071] A. Gaseous products

[0072] Composition changes are associated with the pyrolysis process: During the pyrolysis process, the composition of the gaseous products changes as the reaction proceeds. 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 progresses, 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 of the inner barrel of the continuous pyrolyzer, more coal tar is converted into gas, and most of the water has evaporated in the early stage. In the later stage of the pyrolysis reaction, the third gaseous product includes a large amount of gaseous coal tar, trace 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, the gaseous coal tar will condense into liquid coal tar and separate from water and non-condensable gas. The liquid products obtained after cooling are stored in the corresponding horizontal liquid storage tanks, and then merged into the coal tar intermediate storage tank for further treatment and processing, such as extracting coal tar products of different qualities and uses through distillation, fractionation and other processes, such as fuel oil, chemical raw materials, etc., to achieve efficient recovery and resource utilization of gaseous coal tar. The non-condensable gas is collected and pressure-stabilized, and then sent to the combustion chamber for combustion as fuel, realizing the recycling of non-condensable gas and reducing energy waste and environmental pollution.

[0074] B. Liquid products

[0075] Composition changes and process effects: The first liquid product includes a small amount of liquid coal tar and a large amount of water. This is the result of oil-water separation in the initial stage of secondary preheating. At this time, most of it is water, and the liquid coal tar content is relatively small. As the pyrolysis process progresses, the liquid coal tar content in the second liquid product increases and the water content decreases, reflecting the gradual enrichment of coal tar during the pyrolysis process. The third liquid product includes a large amount of liquid coal tar and a trace amount of water, indicating that in the later stage of pyrolysis, most of the water has been removed and a relatively pure liquid coal tar has been obtained.

[0076] Processing and comprehensive utilization: The liquid coal tar in the first liquid product, the second liquid product and the third liquid product are combined and sent to the coal tar intermediate storage tank for further processing. These liquid coal tars can be further 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, 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 standard discharge or reuse, etc., to achieve the rational use of water resources and environmental protection.

[0077] C. Solid products

[0078] Characteristics and application value: The solid products produced by pyrolysis are mainly carbon particles, which have a high carbon content and a certain calorific value. The cooled carbon particles can be used as high-quality fuel for industrial boilers and other equipment, providing enterprises with a stable heat supply, replacing some traditional fuels, and reducing energy costs. In addition, the carbon particles can be further processed to make activated carbon and other products for use in sewage treatment, air purification and other fields, realizing the 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 treatment process provided by the present invention have significant advantages and innovations. In terms of energy saving, the energy utilization rate is greatly improved and energy consumption is reduced through multi-stage recovery and utilization of waste heat and equipment optimization; in terms of carbon reduction, the recycling of non-condensable gas and the selection of clean energy effectively reduce carbon emissions, realize sustainable utilization of resources and friendly protection of the environment; the automated and continuous design ensures the stable operation and efficient production of the system, improves production efficiency and product quality; and perfect safety measures ensure the safe and reliable operation of the system from multiple aspects such as 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 economical treatment of tar residue. It has broad application prospects and promotion value, and provides an advanced solution for the field of industrial solid waste treatment. It meets the current strategic requirements of sustainable development and is of great significance for promoting technological progress and environmental protection in the industry.

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

[0081] 1. Improve energy utilization: The tar residue treatment system of the present invention is a continuously operated system. The continuous operation of the system greatly reduces energy consumption, and by repeatedly utilizing the hot air waste heat generated during the pyrolysis process, the energy utilization rate is effectively improved. After the pyrolysis is completed, part of the high-temperature hot air remaining is sent to the combustion chamber for heating and then continued 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, ensuring that the tar residue can reach the ideal preheating temperature before entering the continuous pyrolyzer, maximizing the recovery of heat energy and reducing energy waste.

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

[0083] 3. High safety: The non-condensable gas in the tar slag treatment system is continuously extracted through the non-condensable gas extraction tower, so that the entire tar slag treatment system is in a slightly negative pressure state, and no gas leakage will occur, making the production process highly safe.

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

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

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

[0087] In summary, the tar residue treatment system and treatment process provided by the present invention overcome the shortcomings of the prior art by optimizing the preheating effect, improving energy utilization, reducing environmental pollution, improving economic benefits and simplifying the process flow, and realize efficient, environmentally friendly and economical treatment of tar residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] The accompanying drawings are incorporated in and constitute a part of this specification and, together with the description, serve to explain the principles of the present invention.

[0089] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0090] Figure 1 The figure is a flow chart of the processing technology of the present invention. DETAILED DESCRIPTION

[0091] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present invention. Instead, they are merely examples of devices consistent with some aspects of the present invention as detailed in the appended claims.

[0092] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0093] Example

[0094] See also Figure 1 As shown, this embodiment provides a tar residue processing system, comprising:

[0095] The first preheating zone sends the tar residue to the conical tank for initial preheating. The first preheating zone also includes a heat transfer oil coil arranged in the conical tank and used for heating the tar residue. The heat transfer oil coil uses a flue gas heat exchanger to perform heat exchange with the residual hot air of the preheater;

[0096] The second preheating zone performs secondary preheating on the tar slag after the initial preheating, and the first gaseous product is produced during the secondary preheating. The first gaseous product enters the preheating cooler for cooling to obtain a first liquid product and non-condensable gas; the second preheating zone includes a drum-type preheater, and hot air is introduced into the outer cylinder of the preheater to heat the tar slag in the inner cylinder of the preheater;

[0097] The pyrolysis zone includes a combustion chamber and a continuous pyrolyzer, wherein the combustion chamber passes the high-temperature hot gas generated by the mixed combustion of natural gas and air to the outer cylinder of the continuous pyrolyzer; the tar residue preheated for the second time is fed into the rotating inner cylinder of the continuous pyrolyzer, and 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 tar residue preheated for the second time just enters the continuous pyrolyzer, it gradually begins to pyrolyze in the inner cylinder of the continuous pyrolyzer to produce a second gaseous product, and the second gaseous product is passed to the front liquid separation cooler for cooling to obtain a second liquid product and a non-condensable product;

[0098] In the discharging area, the solid product produced after pyrolysis is cooled and sent to the carbon powder silo by the discharging machine in the discharging area;

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

[0100] After the pyrolysis in the continuous pyrolyzer is completed, 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, and the other part is sent to the second preheating area for secondary preheating of the initially preheated tar residue. After the secondary preheating, the hot air is sent to the first preheating area, and the flue gas heat exchanger is used to preheat the heat transfer oil in the heat transfer oil coil. The remaining hot air after preheating is treated in the desulfurization tower and then discharged.

[0101] Specifically, the first preheating zone includes 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 to the heat transfer oil coil. The heat transfer oil spiral pipe is arranged in a circulating outer cylinder. The air inlet of the circulating outer cylinder is connected to the outer cylinder of the preheater, the air outlet of the circulating outer cylinder is connected to the desulfurization tower, and the conical tank is connected to the inner cylinder of the preheater.

[0102] Specifically, the combustion chamber is also provided with a burner for mixing natural gas and air. The natural gas is decompressed through a decompression station before entering the burner; the non-condensable gas flows to the burner.

[0103] Specifically, the hot air after pyrolysis in the continuous pyrolyzer enters the flue gas conditioning box through the heat recovery fan. After being regulated by the flue gas conditioning box, part of the hot air enters the combustion chamber, and the other part goes to the outer cylinder of the preheater.

[0104] Specifically, the structures of the preheating cooler, the front liquid separation cooler, and the rear liquid separation cooler are the same, all of which are double-tower structures, 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 bottoms of the first tower and the second tower are connected to a horizontal liquid storage tank, and the first tower is provided with a coolant coil for cooling the gaseous product; the horizontal liquid storage tank is connected to a coal tar intermediate storage tank; each of the non-condensable gas extraction towers continuously extracts non-condensable gas in the tar residue treatment system, so that the tar residue treatment system is in a slightly negative pressure environment.

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

[0106] Step 1: The tar slag in the tar slag raw material storage tank is sent to the conical tank through the crane grab, and is preheated for the first time (preheated to 30-60°C) by the heat transfer oil coil in the conical tank, and the heat transfer oil coil is preheated (preheated to about 100°C) by the residual hot air (about 270°C) of the preheater;

[0107] Step 2: The tar residue after the initial preheating is sent to a drum-type preheater through a plunger pump for oil-water separation, and the residual hot air of the continuous pyrolyzer is used for secondary preheating (preheating to 150-190° C.), and crude evaporation is performed at the same time to form heavy tar residue; the first gaseous product (gaseous coal tar, a mixture of water and water vapor, and non-condensable gas) generated by the secondary preheating enters a preheating cooler for cooling to obtain a first liquid product (a mixture of liquid coal tar and water) and non-condensable gas;

[0108] Step 3: The heavy tar residue formed after the secondary preheating flows by gravity into the rotating inner cylinder of the continuous pyrolyzer (slightly negative pressure of about -20Pa), and is pyrolyzed by the high-temperature hot gas (about 550°C) generated by combustion in the combustion chamber (slightly negative pressure of about -120Pa). During the pyrolysis process, part of the second gaseous product (gaseous coal tar, a mixture of water vapor and non-condensable gas) is also produced in the inner cylinder of the continuous pyrolyzer. The second gaseous product is cooled in the front liquid separation cooler to obtain a second liquid product (a mixture of liquid coal tar and water) and non-condensable gas; the pyrolysis reaction finally converts the tar residue into a third gaseous product (a mixture of gaseous coal tar and water vapor, non-condensable gas) and a solid product (carbon particles); at the same time, the high-temperature hot gas The hot air (about 530℃) formed after the pyrolysis is completed is extracted by the heat recovery fan and then circulated. A part of the hot air (temperature is about 500℃) is sent to the combustion chamber for heating and then continues to the continuous pyrolyzer to pyrolyze the tar residue. The other part of the hot air (about 400℃) is used for secondary preheating and rough evaporation separation of the tar residue in turn. After the secondary preheating, the remaining hot air (about 270℃) is used to heat the internal heat transfer oil coil by the flue gas heat exchanger (the temperature of the heat transfer oil is about 100℃ after heat exchange), and is preheated with the tar residue in the conical tank for the first time (preheated to 30-60℃). Finally, the hot air (120℃) coming out of the flue gas heat exchanger is treated in the desulfurization tower (the hot air temperature is about 60℃) and then discharged;

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

[0110] Step 5: send the liquid coal tar extracted from the first liquid product, the second liquid product and the third liquid product to the coal tar intermediate storage tank for further processing; all the non-condensable gases are combined and pumped to the pressure stabilizing tank by a vacuum pump and then sent to the combustion chamber to serve as fuel for combustion, thereby 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 trace 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 trace 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 becomes higher and higher, and the content of water vapor becomes lower and lower during the pyrolysis process; the content of liquid coal tar in the first liquid product, the second liquid product, and the third liquid product becomes higher and higher, and the content of water becomes lower and lower, and the coal tar content and water content of the finally obtained carbon powder are negligible, so that the carbon powder meets the conditions for reuse.

[0113] Specifically, the heat transfer oil spiral pipe in the flue gas heat exchanger is connected to the heat transfer oil coil, the air outlet of the circulating outer cylinder is connected to the desulfurization tower, the air inlet of the circulating outer cylinder is connected to the air outlet of the preheater, and the air inlet of the preheater is connected to the flue gas conditioning box; the discharge port of the conical tank is connected to the feed port of the preheater through a plunger pump, and the discharge port of the preheater is connected to the feed port of the continuous pyrolyzer, and the feed port of the continuous pyrolyzer is also connected to a cooling device for cooling the oil and gas generated by the tar residue after the secondary preheating. The front liquid separation cooler; the carbon powder discharge port of the continuous pyrolyzer is connected to the rotating water-cooling coil, the discharge machine and the carbon powder silo in sequence; the oil and gas discharge port of the continuous pyrolyzer is connected to the rear liquid separation cooler; the front liquid separation cooler and the liquid separation cooler are both connected to the coal tar intermediate storage tank, and the non-condensable gas is pumped to the pressure-stabilizing tank through a vacuum pump and sent to the combustion chamber for combustion treatment; the coal tar intermediate storage tank eventually leads to the oil tank area for subsequent oil sales; the carbon powder in the carbon powder silo is subsequently loaded and sold.

[0114] Specifically, the tar residue processing channel in the tar residue processing system monitors the real-time internal pressure through the control system, and controls the exhaust rate of the non-condensable gas exhaust tower to keep the tar residue processing system in a constant slightly negative pressure state;

[0115] The pressure of the outer cylinder of the continuous pyrolyzer in the tar residue treatment system is a slight negative pressure of about -120Pa, which is achieved by a heat recovery fan arranged at the hot air outlet of the continuous pyrolyzer. The control system adjusts the size of the hot air extraction flow of the heat recovery fan by monitoring the real-time internal pressure of the outer cylinder of the pyrolyzer, so that the outer cylinder of the pyrolyzer and the combustion chamber are at a slight negative pressure.

[0116] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. 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 present invention.

[0117] It should be understood that the present invention is not limited to what has been described above and that various modifications and changes may be made without departing from its scope. The scope of the present invention is limited only by the appended claims.

Claims

1. A tar residue treatment system, characterized in that: include: The first preheating zone is used to send the tar residue to the conical tank for initial preheating. The first preheating zone also includes a heat transfer oil coil disposed in the conical tank and used for heating the tar residue. The second preheating zone is used to perform secondary preheating on the tar slag after the initial preheating. The first gaseous product is produced during the secondary preheating. The first gaseous product is sent to the 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 slag in the inner cylinder of the preheater. The pyrolysis zone includes a combustion chamber and a continuous pyrolyzer, wherein the combustion chamber passes the high-temperature hot gas generated by the combustion of the mixture of natural gas and air to the outer cylinder of the continuous pyrolyzer; the secondary preheated tar residue is fed into the rotating inner cylinder of the continuous pyrolyzer, and is pyrolyzed by the high-temperature hot gas in the outer cylinder of the continuous pyrolyzer, and the pyrolysis reaction eventually converts the tar residue into a third gaseous product and a solid product; wherein, when the secondary preheated tar residue just enters the continuous pyrolyzer, it gradually begins to pyrolyze in the inner cylinder of the continuous pyrolyzer to produce a second gaseous product, and the second gaseous product is passed to the front liquid separation cooler for cooling to obtain a second liquid product and non-condensable gas; In the discharging area, the solid product produced after pyrolysis is cooled and sent to the carbon powder silo by the discharging machine in the discharging area; In the coal tar processing area, the third gaseous product generated during the pyrolysis process is cooled by the post-liquid separation cooler to obtain the third liquid product and non-condensable gas; the coal tar in the first liquid product, the second liquid product, and the third liquid product obtained above are all combined and sent to the coal tar intermediate storage tank to wait for further processing, and all the non-condensable gases are combined and sent to the combustion chamber to serve as fuel for combustion; After the pyrolysis in the continuous pyrolyzer is completed, 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, and the other part of the hot air is sent to the second preheating zone, and the waste heat of the hot air is used to preheat the initially preheated tar residue for a second time. After the second preheating, the hot air is sent to the first preheating zone, and 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 in the desulfurization tower and then discharged.

2. The tar residue treatment system according to claim 1, characterized in that: The first preheating zone includes 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 to the heat transfer oil coil. The heat transfer oil spiral pipe is arranged in a circulating outer cylinder. The air inlet of the circulating outer cylinder is connected to the outer cylinder of the preheater, the air outlet of the circulating outer cylinder is connected to the desulfurization tower, and the conical tank is connected to the inner cylinder of the preheater.

3. The tar residue treatment system according to claim 1, characterized in that: The combustion chamber is also provided with a burner for mixing natural gas and air. The natural gas is decompressed through a decompression station before entering the burner. The non-condensable gas flows to the burner.

4. The tar residue treatment system according to claim 1, characterized in that: After the pyrolysis is completed in the continuous pyrolyzer, the hot air enters the flue gas conditioning box through the heat recovery fan. After being regulated by the flue gas conditioning box, part of the hot air enters the combustion chamber, and the other part of the hot air is directed to the outer cylinder of the preheater.

5. The tar residue treatment system according to claim 1, characterized in that: The structures of the preheating cooler, the front liquid separation cooler, and the rear liquid separation cooler are the same, all of which are double-tower structures, 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 bottoms of the first tower and the second tower are connected to horizontal liquid storage tanks. The first tower is provided with a coolant coil for cooling the gaseous product. Each of the non-condensable gas extraction towers continuously extracts non-condensable gas in the tar residue treatment system, so that the tar residue treatment system is in a slightly negative pressure environment.

6. A tar residue treatment process based on the tar residue treatment system according to any one of claims 1 to 5, characterized in that: The following steps are involved: Step 1, sending the tar residue to be treated to a conical tank, and using the heat transfer oil coil in the conical tank for initial preheating, wherein the heat transfer oil coil is preheated by using the residual hot air preheating of the preheating machine; Step 2: Send the tar residue after the initial preheating to a drum-type preheater, and use the residual heat of the hot air from the continuous pyrolyzer for secondary preheating; the first gaseous product produced 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 the secondary preheating is sent to the continuous pyrolyzer, and the high-temperature hot gas generated by the combustion in the combustion chamber is used for pyrolysis. During the pyrolysis process, part of the second gaseous product is also generated in the inner cylinder of the continuous pyrolyzer, and the second gaseous product is sent to the front liquid separation cooler for cooling to obtain a second liquid product and non-condensable gas; the pyrolysis reaction finally converts the tar residue into a third gaseous product and a solid product; at the same time, a part of the hot air after the high-temperature hot gas pyrolysis is sent to the combustion chamber for heating and then continues to be sent to the continuous pyrolyzer to pyrolyze the tar residue, and the waste heat of the other part of the hot air is used to perform secondary preheating and primary preheating on the tar residue in sequence; Step 4: After the solid product is cooled, it is sent to the carbon powder bin for storage by the discharging machine; the third gaseous product is cooled by the post-liquid separation cooler to obtain the third liquid product and non-condensable gas; Step 5: send the liquid coal tar extracted from the first liquid product, the second liquid product and the third liquid product to the coal tar intermediate storage tank for further processing, and all the non-condensable gases obtained are directed to the combustion chamber to serve as fuel for combustion, thereby completing the processing of the tar residue.

7. The tar residue treatment process according to claim 6, characterized in that: In step 3, the solid product is carbon particles.

8. The tar residue treatment process according to claim 6, characterized in that: 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 trace amount of water vapor and non-condensable gas.

9. The tar residue treatment process according to claim 6, 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.

10. The tar residue treatment process according to claim 6, characterized in that: The generated non-condensable gas is stabilized by the pressure stabilizing tank and then flows into the combustion chamber.

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