Asphalt tail gas in-furnace combustion treatment system
Patent Information
- Application Number
- CN202522208389.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-10-20
- Publication Date
- 2026-10-09
- Estimated Expiration
- 2035-10-20
AI Technical Summary
[0005]本实用新型为了解决现有的沥青尾气处理系统中，直接放散无法满足环境的要求，而设立的处理系统焚烧炉炉膛的烟气管道内存在发生燃烧的现象，存在严重的安全隐患的一系列问题，提供了一种沥青尾气进炉燃烧处理系统
本实用新型所提供的一种沥青尾气进炉燃烧处理系统，通过设置旋涡分离器、除雾阻火器和水封槽，有效隔离尾气中的水雾和油雾，使尾气中的大量水雾被隔离在除雾阻火器中，彻底消除了其在后续管道内凝结积聚而被引燃的安全隐患；
Smart Images
Figure CN224837405U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of coking production technology, and in particular to the field of asphalt tail gas treatment, specifically an asphalt tail gas combustion treatment system. Background Technology
[0002] In the coking industry, asphalt exhaust gas (including exhaust gas generated from processes such as liquid loading and asphalt molding) is typically discharged directly after only simple scrubbing treatment. However, with increasingly stringent environmental protection requirements, the following treatment method is commonly used in the field for asphalt exhaust gas incineration: First, the asphalt exhaust gas is collected through the flue gas main. Low-naphthalene wash oil obtained from tar distillation is used as the absorbent. The asphalt exhaust gas is absorbed and treated by a jet mixer, so that most of the harmful substances are captured by the wash oil. Then, the gas-liquid mixture achieves gas-liquid separation. The separated gas then enters the exhaust gas scrubbing tower for secondary washing. Finally, it is sent to the incinerator by the exhaust fan, where the remaining harmful substances are completely removed by combustion.
[0003] However, in actual production, it was found that combustion occurred in the flue gas duct leading to the incinerator furnace during the operation of the above-mentioned treatment system. Research revealed that the cause was that the exhaust gas, even after washing, still contained a large amount of air, and the volume of asphalt exhaust gas remained high even after being washed by the jet mixer. When it passed at high speed through the exhaust gas scrubbing tower equipped with wash oil spray, it would carry wash oil droplets. This entrained wash oil mist condensed on the inner wall of the duct leading to the incinerator, accumulating over a long period to form flammable oil scale, which could be ignited at the duct inlet leading to the incinerator furnace, thus causing a hazard.
[0004] To address the aforementioned issues, those skilled in the art have attempted to install demisters and flame arresters near the incinerator in the flue gas duct. However, this measure only alleviates localized problems and does not systematically solve a series of fundamental issues such as the risk of backfire caused by pressure fluctuations, liquid accumulation in the duct due to excessive liquid droplets in the exhaust gas, and system instability. Therefore, there is an urgent need to develop a system for treating asphalt exhaust gas before combustion in the incinerator. Utility Model Content
[0005] This invention addresses a series of problems in existing asphalt exhaust gas treatment systems, such as the inability of direct venting to meet environmental requirements, the existence of combustion within the flue gas duct of the incinerator furnace, and the resulting serious safety hazards. It provides an asphalt exhaust gas combustion treatment system.
[0006] This utility model is achieved using the following technical solution: An asphalt tail gas combustion treatment system includes a tail gas tower connected to a flue gas main, an oil washer connected to the tail gas tower, an injection mixer connected to the oil washer to absorb and treat the asphalt tail gas, and a tail gas circulation pump installed on the connecting pipeline between the oil washer and the tail gas tower. The top outlet of the tail gas tower is connected to the inlet of a vortex separator through a first pipeline, the top outlet of the vortex separator is connected to a water seal tank through a second pipeline, the inlet of the second pipeline into the water seal tank is inserted below the liquid surface in the water seal tank, the bottom outlet of the water seal tank is connected to an oil separator through a third pipeline, the outlet of the oil separator is connected back to the water seal tank through a fourth pipeline, the top flue gas outlet of the water seal tank is connected to a demister flame arrester through a fifth pipeline, the top outlet of the demister flame arrester has a first branch and a second branch, the first branch is connected to a vent pipe through a valve, and the second branch is connected to the burner of the incinerator through a valve.
[0007] In implementation, the system includes a tail gas tower connected to a main flue gas pipe, an oil washer connected to the tail gas tower, and a jet mixer connected to the oil washer to absorb and treat the asphalt tail gas. The jet mixer is connected to a tar distillation pipe, which uses low-naphthalene wash oil as an absorbent. A tail gas circulation pump is installed on the connecting pipe between the oil washer and the tail gas tower. The tail gas tower section uses the same device and connection as existing technology. The top outlet of the tail gas tower is connected to the inlet of a vortex separator through a first pipe. The top outlet of the vortex separator is connected to a water seal tank through a second pipe. The inlet of the second pipe into the water seal tank is inserted below the liquid surface in the water seal tank. Specifically, the water seal tank is a closed tank with an asphalt tail gas inlet and a flue gas outlet at the top. An inlet pipe is connected below the asphalt tail gas inlet and is inserted below the liquid surface in the water seal tank. The asphalt tail gas bubbles evenly around the flue gas. The inlet pipe is connected to the second pipe. The second pipe is equipped with a tail gas fan. Two tail gas fans are connected in parallel, one in use and one as a backup. The bottom outlet of the water seal tank is connected to an oil separator via a third pipeline. The outlet of the oil separator is connected back to the water seal tank via a fourth pipeline, which is equipped with an oil separator circulation pump to maintain a stable liquid level in the tank. The top flue gas outlet of the water seal tank is connected to a demister flame arrester via a fifth pipeline. The demister flame arrester uses existing equipment; installing this device alone can only alleviate local problems and cannot completely eliminate risks. When the exhaust gas passes through the demister flame arrester, the liquid droplets are first captured, and then the flame is extinguished by the flame arrestor layer to extinguish any possible backflow of flame. The top outlet of the demister flame arrester has a first branch and a second branch. The first branch is connected via a valve. The vent pipe has a second branch that connects to the burner of the incinerator via a valve. The burner is connected to the main body of the incinerator. A gas delivery pipeline is connected to the middle of the lower intake cylinder of the burner, entering the inner ring area of the burner to deliver gas to the combustion front end, serving as the core fuel flow channel for combustion. A second branch for asphalt exhaust gas is connected to the side wall of the lower intake cylinder, entering the outer ring area of the burner. The outer ring of the lower intake cylinder is equipped with exhaust gas plates to guide the asphalt exhaust gas, causing it to be injected in a rotating state. This ensures that the exhaust gas is evenly distributed circumferentially along the lower intake cylinder, facilitating its diffusion into the inner ring area and mixing with the gas. The rotating and diffused asphalt exhaust gas mixes thoroughly and evenly with the central jet of gas at the inner ring of the burner before being injected into the innermost ring of the furnace for complete combustion. This effectively ensures a full and stable flame shape, avoids the formation of localized high-temperature zones, and fundamentally solves the problem of coking in the furnace tubes.
[0008] This system provides power for conveying exhaust gas through a blower, stabilizes pressure and performs preliminary oil removal through a water seal tank, ensures pipeline dryness and safety through a demisting flame arrester, and finally achieves stable mixing and complete combustion of exhaust gas and coal gas through a burner, thus forming a complete and safe asphalt exhaust gas combustion treatment system to ensure that asphalt exhaust gas meets combustion standards.
[0009] Compared with the prior art, the present invention has the following beneficial effects: The asphalt tail gas combustion treatment system provided by this utility model effectively isolates water mist and oil mist in the tail gas by setting up a vortex separator, a demisting flame arrester and a water seal tank. The large amount of water mist in the tail gas is isolated in the demisting flame arrester, which completely eliminates the safety hazard of condensation and accumulation in the subsequent pipeline and ignition. This system effectively adjusts the burner connection method of the heating furnace, achieving full and uniform mixing of coal gas and asphalt tail gas, making combustion more stable, avoiding backfire or furnace extinguishing problems caused by local combustion instability, and also preventing coking of furnace tubes; while ensuring that asphalt tail gas meets the combustion standards, this system significantly improves the safety and operational stability of the entire process system. Attached Figure Description
[0010] Figure 1 This is a schematic diagram of the layout of this utility model.
[0011] In the diagram: 1. Exhaust gas tower; 2. Exhaust gas circulation pump; 3. Oil washer; 4. Vortex separator; 5. Water seal tank; 6. Oil separator; 7. Oil separator circulation pump; 8. Demisting flame arrester; 9. Incinerator; 10. Lower air inlet; 11. First pipeline; 12. Second pipeline; 13. Third pipeline; 14. Fourth pipeline; 15. Fifth pipeline; 16. First branch line; 17. Exhaust gas fan; 18. Second branch line; 19. Gas transmission pipeline. Detailed Implementation
[0012] The specific embodiments of this utility model will now be described with reference to the accompanying drawings.
[0013] A system for treating asphalt exhaust gas by combustion in a furnace, such as Figure 1 As shown: The system includes a tail gas tower 1 connected to a main flue gas pipe. An oil washer 3 is connected to the tail gas tower 1. An injection mixer connected to the oil washer 3 absorbs and treats the asphalt tail gas. The injection mixer is connected to a tar distillation pipe, through which low-naphthalene wash oil is introduced as an absorbent. A tail gas circulation pump 2 is installed on the connecting pipe between the oil washer 3 and the tail gas tower 1. The tail gas tower 1 uses the same device and connections as existing technology. The top outlet of the tail gas tower 1 is connected to the inlet of a vortex separator 4 via a first pipe 11. The top outlet of the vortex separator 4 is connected to... The second pipeline 12 is connected to the water seal tank 5. The inlet of the second pipeline 12 into the water seal tank 5 is inserted below the liquid surface inside the water seal tank 5. Specifically, the water seal tank 5 is a closed tank with an asphalt exhaust gas inlet and a flue gas outlet at the top. An inlet pipe is connected below the asphalt exhaust gas inlet. The inlet pipe is inserted below the liquid surface inside the water seal tank 5. The asphalt exhaust gas bubbles evenly along the surrounding flue gas. The inlet pipe is connected to the second pipeline 12. The second pipeline 12 is equipped with an exhaust gas fan 17. Two exhaust gas fans 17 are connected in parallel, one for use and one for backup. The bottom outlet of the water seal tank 5 is connected to an oil separator 6 via a third pipe 13. The outlet of the oil separator 6 is connected back to the water seal tank 5 via a fourth pipe 14. An oil separator circulation pump 7 is installed on the fourth pipe 14 to maintain a stable liquid level in the tank. The top flue gas outlet of the water seal tank 5 is connected to a demister flame arrester 8 via a fifth pipe 15. The demister flame arrester 8 uses existing equipment. When this device is installed alone, it can only alleviate local problems and cannot completely avoid risks. When the exhaust gas passes through the demister flame arrester 8, the liquid droplets in it are first captured, and then the flame that may be transmitted back is extinguished through the flame arrestor layer. The top outlet of the demister flame arrester 8 has a first branch 16 and a second branch 18. The first branch 16 is connected to... A valve connects to a vent pipe, and a second branch 18 connects to the burner of the incinerator 9 via a valve. The burner is connected to the main body of the incinerator 9. A gas delivery pipe 19 is connected to the middle of the lower air inlet cylinder 10 of the burner, entering the inner ring area of the burner to deliver gas to the combustion front end, serving as the core fuel flow channel for combustion. A second branch 18, which receives asphalt tail gas, is connected to the side wall of the lower air inlet cylinder 10, entering the outer ring area of the burner. The outer ring of the lower air inlet cylinder 10 is equipped with a tail gas plate to guide the flow of asphalt tail gas, causing the asphalt tail gas to be injected in a rotating state. This allows the tail gas to be evenly distributed along the circumference of the lower air inlet cylinder 10 after entering, facilitating the diffusion of the tail gas into the inner ring area and mixing with the gas. The rotating and diffused asphalt tail gas and the central jet of gas are fully and evenly mixed at the inner ring of the burner front end before being injected into the innermost ring of the furnace for full combustion. This effectively ensures a full and stable flame shape, avoids the generation of local high-temperature zones, and fundamentally solves the problem of coking in the furnace tubes.
[0014] This system provides power for conveying exhaust gas through exhaust gas fan 17, stabilizes pressure and performs preliminary oil removal through water seal tank 5, ensures pipeline dryness and safety through demisting flame arrester 8, and finally achieves stable mixing and complete combustion of exhaust gas and coal gas through burner, thus forming a complete and safe asphalt exhaust gas combustion treatment system to ensure that asphalt exhaust gas meets the combustion standards.
[0015] The scope of protection claimed by this utility model is not limited to the specific embodiments described above. Moreover, for those skilled in the art, this utility model can have various modifications and alterations. Any modifications, improvements, and equivalent substitutions made within the concept and principles of this utility model should be included within the protection scope of this utility model.
Claims
1. An asphalt tail gas combustion treatment system, comprising a tail gas tower (1) connected to a flue gas main pipe, an oil washer (3) connected to the tail gas tower (1), an injection mixer connected to the oil washer (3) to absorb and treat the asphalt tail gas, and a tail gas circulation pump (2) installed on the connecting pipe between the oil washer (3) and the tail gas tower (1). Its features are: The top outlet of the tail gas tower (1) is connected to the inlet of the vortex separator (4) through the first pipeline (11). The top outlet of the vortex separator (4) is connected to the water seal tank (5) through the second pipeline (12). The pipe opening of the second pipeline (12) into the water seal tank (5) is inserted below the liquid level in the water seal tank (5). The bottom outlet of the water seal tank (5) is connected to the oil separator (6) through the third pipeline (13). The outlet of the oil separator (6) is connected back to the water seal tank (5) through the fourth pipeline (14). The top flue gas outlet of the water seal tank (5) is connected to the demisting flame arrester (8) through the fifth pipeline (15). The top outlet of the demisting flame arrester (8) is provided with a first branch (16) and a second branch (18). The first branch (16) is connected to the vent pipe through a valve. The second branch (18) is connected to the burner of the incinerator (9) through a valve.
2. The asphalt tail gas combustion treatment system according to claim 1, characterized in that: The burner is connected to the main body of the incinerator (9), and a gas transmission pipeline (19) is connected to the middle of the lower air inlet cylinder (10) of the burner. A second branch (18) for receiving asphalt tail gas is connected to the side wall of the lower air inlet cylinder (10).
3. The asphalt tail gas combustion treatment system according to claim 1, characterized in that: The top is provided with an asphalt exhaust gas inlet and a flue gas outlet. An inlet pipe is connected below the asphalt exhaust gas inlet. The inlet pipe is inserted below the liquid level in the water seal tank (5) body. The inlet pipe is connected to the second pipeline (12).
4. The asphalt tail gas combustion treatment system according to claim 1, characterized in that: The jet mixer is connected to a tar distillation tube.
5. The asphalt tail gas combustion treatment system according to claim 1, characterized in that: The second pipeline (12) is equipped with an exhaust gas fan (17), and two exhaust gas fans (17) are connected in parallel, one for use and one for backup.
6. The asphalt tail gas combustion treatment system according to claim 1, characterized in that: The fourth pipeline (14) is equipped with an oil separator circulation pump (7) to maintain a stable liquid level in the tank.