CN212492204U - Tail gas treatment system of kettle type heating method modified asphalt reaction kettle - Google Patents
Tail gas treatment system of kettle type heating method modified asphalt reaction kettle Download PDFInfo
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- CN212492204U CN212492204U CN202021925049.5U CN202021925049U CN212492204U CN 212492204 U CN212492204 U CN 212492204U CN 202021925049 U CN202021925049 U CN 202021925049U CN 212492204 U CN212492204 U CN 212492204U
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Abstract
The utility model relates to a tail gas treatment system of a kettle type heating method modified asphalt reaction kettle, which comprises a flash oil tank, a tail gas cooler, a gas-liquid separator, a mist catcher, a cyclone separator, a tail gas fan, an active carbon filter, a safe water seal tank and a tubular furnace; the utility model discloses a degree of depth cooling, gas-liquid separation and active carbon filter are filtered, get rid of the gaseous component of condensable in the tail gas, make the tail gas after handling can reach the requirement of burning through the tube furnace.
Description
Technical Field
The utility model relates to an industrial tail gas purification handles technical field, especially relates to a cauldron formula heating method modified pitch reation kettle's tail gas treatment system.
Background
About 50% -60% of asphalt is generally generated in the coal tar processing process, which belongs to a bulk product of tar processing, and the larger the processing scale is, the more the asphalt yield is. The modified asphalt is the main downstream product of the existing asphalt and is mainly used for producing prebaked anodes in the electrolytic aluminum industry to prepare battery rods or electrode binders.
At present, the domestic modified asphalt production process mostly adopts a thermal polycondensation method, the thermal polycondensation method can be divided into a kettle type heating method and a tube furnace heating method according to the heating mode, and the utility model aims at the modified asphalt production process of the kettle type heating method.
The production process of modified asphalt by kettle type heating method uses medium temperature asphalt as raw material, and uses heating furnace to directly heat the external surface of reaction kettle, and the reaction kettle interior can be controlled by means of a certain reaction residence time and proper reaction temperature so as to attain the goal of modifying asphalt. As the heating surface is the outer surface of the reaction kettle, in order to achieve good mass and heat transfer effects, a stirrer needs to be arranged in the reaction kettle, so that the volume in the reaction kettle is limited, and the design production capacity is limited, so that the subsequent tubular furnace heating method is provided.
The production process of modified asphalt by kettle-type heating method is characterized by that it is an old process, and basically adopts normal-pressure operation, and the tail gas of modified asphalt reaction kettle, tail gas of modified asphalt high-level tank and tail gas of asphalt forming are combined, and fed into an exhaust cleaning tower, cleaned by washing oil and discharged into atmosphere.
Because the purification capacity of the exhaust cleaning method is limited, the exhaust gas after the exhaust cleaning tower is directly discharged into the atmosphere, the current environmental protection requirement cannot be met, and the existing exhaust gas system needs to be upgraded and modified. In the existing transformation scheme, the cleaned tail gas basically adopts an incineration mode so as to improve the operation environment of workers and meet the requirement of environmental protection; the tail gas of the tar production device is basically all condensable gas, after being cleaned by an exhaust cleaning method, although the tail gas can not meet the requirement of environmental protection, combustible components are basically absorbed by washing oil, and the main component of the tail gas is air which can be directly sent to a tubular furnace to be burnt; only the tail gas of the modified asphalt reaction kettle is special, and the modified asphalt reaction kettle and the tail gas cannot be sent into a tubular furnace together with other tail gas for incineration treatment.
The tail gas of the modified asphalt reaction kettle in the kettle type heating method has the following characteristics:
1) the main components of the asphalt are micromolecules such as hydrogen, methane, water and the like generated in the thermal polycondensation process of aromatic hydrocarbon molecules in asphalt, and the asphalt contains a large amount of fogdrops such as carbon cyclic hydrocarbon, cyclic hydrocarbon derivatives and the like, wherein a plurality of polycyclic aromatic hydrocarbon substances such as benzopyrene, benzanthracene, carbazole and the like are most carcinogenic and strong carcinogenic substances; the tail gas of the modified asphalt reaction kettle belongs to non-condensable combustible gas containing certain condensable components, and after being mixed with other tail gas containing a large amount of air, the tail gas has the probability of generating explosive mixtures, so the tail gas cannot be mixed with other tail gas for incineration;
2) because the production process of the modified asphalt by the kettle type heating method belongs to normal pressure operation, the flow of tail gas is small, the pressure is low (only about 1 kPa), the direct combustion is unsafe, and the tempering phenomenon is easy to generate;
3) the tail gas of the modified asphalt reaction kettle is accompanied with a large amount of fog drops, and the direct combustion can block a combustion nozzle of the tubular furnace.
In summary, if the tail gas of the modified asphalt reactor in the kettle-type heating method is treated by incineration, the tail gas needs to be pretreated by a specific process so as to reach the incineration condition.
Disclosure of Invention
The utility model provides a kettle-type heating method modified asphalt reation kettle's tail gas treatment system filters through deep cooling, gas-liquid separation and active carbon filter, gets rid of the condensable gas component in the tail gas, makes the tail gas after handling can reach the requirement of burning through the tube furnace.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
the tail gas treatment system of the kettle type heating modified asphalt reaction kettle comprises a flash oil tank, a tail gas cooler, a gas-liquid separator, a mist catcher, a cyclone separator, a tail gas fan, an active carbon filter, a safe water seal tank and a tubular furnace; the flash oil tank is provided with a tail gas outlet which is connected with an inlet of a tail gas cooler; the middle part of the gas-liquid separator is provided with a clapboard which divides the inner space of the gas-liquid separator into a first chamber and a second chamber; the top of the first chamber is provided with a tail gas inlet and a separated gas outlet, and the top of the second chamber is provided with a cyclone separator; a tail gas inlet on the first chamber is connected with an outlet of the tail gas cooler, a separated gas outlet is connected with an inlet of the mist catcher, and an outlet of the mist catcher is connected with an inlet of the cyclone separator; the middle part of the cyclone separator is provided with a central pipeline, the lower end of the central pipeline is communicated with the second chamber of the gas-liquid separator, the upper end of the central pipeline is sequentially connected with a tail gas fan, an activated carbon filter and a safe water seal tank through a tail gas pipeline, the tubular furnace is provided with a gas inlet which is connected with the gas pipeline, and the safe water seal tank is connected with the gas pipeline through a combustible gas pipeline.
The top of the flash oil tank is also provided with a pressure recording and adjusting alarm instrument and a tail gas returning inlet; a tail gas outlet is arranged on a tail gas pipeline between the tail gas fan and the activated carbon filter and is connected with a returned tail gas inlet on the flash evaporation oil tank through a tail gas returning pipeline; the tail gas returning pipeline is sequentially provided with a first diffused gas outlet, a pressure regulating valve, a nitrogen inlet and a second diffused gas outlet along the flow direction of the tail gas, wherein the nitrogen inlet is connected with the nitrogen pipeline, and the nitrogen pipeline is provided with a self-standing regulating valve I; the first diffused air outlet is connected with the high-altitude diffusing device through a first diffused air pipeline, the second diffused air outlet is connected with the high-altitude diffusing device through a second diffused air pipeline, a safety valve is arranged on the first diffused air pipeline, and an electromagnetic valve is arranged on the second diffused air pipeline; and the pressure recording and adjusting alarm instrument on the flash oil tank is controlled by interlocking with the pressure adjusting valve and the electromagnetic valve.
And a self-standing regulating valve II is arranged on the combustible gas pipeline.
Compared with the prior art, the beneficial effects of the utility model are that:
1) and (3) condensing and cooling steam generated in the thermal polycondensation process of the modified asphalt reaction kettle, and then sending the steam to a flash oil tank for gas-liquid separation, wherein the separated gas is the tail gas of the modified asphalt reaction kettle to be treated. The utility model removes condensable gas components in tail gas through deep cooling, gas-liquid separation and filtration of an active carbon filter, because the condensable gas components contain strong carcinogens such as benzopyrene and the like and are decomposed at more than 1000 ℃, the temperature of a furnace chamber of a common tube furnace is 800 ℃, and the decomposition temperature can not be reached, therefore, the strong carcinogens such as benzopyrene and the like must be removed before being sent to the common tube furnace for incineration; the treated tail gas is merged into a gas pipeline and is directly sent to a common tubular furnace for incineration treatment.
2) The tail gas cooler is cooled by low-temperature water, and compared with normal-temperature circulating water cooling, the condensable gas components in the tail gas can be more effectively reduced;
3) the gas-liquid separator with the partition plate is adopted, two-stage gas-liquid separation can be realized through the assistance of the mist catcher and the cyclone separator, and the gas-liquid separation effect is good;
4) the tail gas fan is additionally arranged to provide power, so that smooth realization of a gas-liquid separation process can be ensured, and pressure is provided for the purified tail gas to be finally merged into a gas pipeline;
5) an activated carbon filter is additionally arranged behind the tail gas fan and used for finally removing fog drops in the tail gas and removing strong carcinogens such as benzopyrene and the like to obtain pure non-condensable combustible gas, so that the phenomenon that the gas pipeline and a nozzle are blocked after the tail gas is merged into the gas pipeline is avoided.
6) The tail gas after purification passes through the safe water seal groove before being merged into the gas pipeline, so as to ensure that the gas cannot flow back into the tail gas treatment system, and eliminate potential safety hazards.
7) One part of tail gas after the tail gas fan is boosted returns to the flash oil tank, and a pressure regulating valve is arranged on a corresponding tail gas returning pipeline, so that the stable operation of stabilizing the pressure of the flash oil tank and ensuring a process system can be realized.
8) The return tail gas pipeline leading to the flash oil tank is additionally connected with a nitrogen pipeline, so that nitrogen can be supplemented under the condition of pressure regulation failure, and the effects of protecting and stabilizing the system pressure are achieved.
9) Through setting up solenoid valve and high altitude diffusion equipment, when tail gas fan shut down because of the trouble, can play the guard action to the system.
10) A self-standing regulating valve II is arranged on the tail gas pipeline before the tail gas pipeline is merged into the gas pipeline, so that the system pressure behind the tail gas fan can be stabilized, and the stability of the system pressure in front of the tail gas fan is further ensured; the pressure of the second self-supporting regulating valve is higher than the pressure of the coal gas, so that the coal gas cannot flow back into the tail gas pipeline.
11) By providing a safety valve, overpressure protection can be performed as soon as the self-standing regulating valve is closed due to failure.
Drawings
FIG. 1 is a schematic structural diagram of a tail gas treatment system of a kettle-type heating asphalt-modifying reaction kettle.
In the figure: 1. the flash oil tank 2, the tail gas cooler 3, the gas-liquid separator 4, the mist catcher 5, the cyclone separator 6, the tail gas fan 7, the activated carbon filter 8, the safe water seal tank 9, the tubular furnace 10, the pressure regulating valve 11, the self-standing regulating valve I12, the electromagnetic valve 13, the self-standing regulating valve II 14, the safety valve 15, the clapboard PRCA01, the pressure recording and regulating alarm instrument
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in fig. 1, the tail gas treatment system of the kettle-type heating asphalt-modifying reaction kettle of the present invention comprises a flash oil tank 1, a tail gas cooler 2, a gas-liquid separator 3, a mist catcher 4, a cyclone separator 5, a tail gas fan 6, an activated carbon filter 7, a safe water seal tank 8 and a tube furnace 9; the flash oil tank 1 is provided with a tail gas outlet which is connected with an inlet of the tail gas cooler 2; the middle part of the gas-liquid separator 3 is provided with a clapboard 15 to divide the inner space into a first chamber and a second chamber; the top of the first chamber is provided with a tail gas inlet and a separated gas outlet, and the top of the second chamber is provided with a cyclone separator 5; a tail gas inlet on the first chamber is connected with an outlet of the tail gas cooler 2, a separated gas outlet is connected with an inlet of a mist catcher 4, and an outlet of the mist catcher 4 is connected with an inlet of a cyclone separator 5; the middle part of the cyclone separator 5 is provided with a central pipeline, the lower end of the central pipeline is communicated with the second chamber of the gas-liquid separator 3, the upper end of the central pipeline is sequentially connected with a tail gas fan 6, an active carbon filter 7 and a safe water seal groove 8 through a tail gas pipeline, the tubular furnace 9 is provided with a gas inlet which is connected with the gas pipeline, and the safe water seal groove 8 is connected with the gas pipeline through a combustible gas pipeline.
The top of the flash oil tank 1 is also provided with a pressure recording and adjusting alarm instrument PRCA01 and a tail gas returning inlet; a tail gas outlet is arranged on a tail gas pipeline between the tail gas fan 6 and the activated carbon filter 7 and is connected with a returned tail gas inlet on the flash evaporation oil tank 1 through a tail gas returning pipeline; the tail gas returning pipeline is sequentially provided with a first diffused gas outlet, a pressure regulating valve 10, a nitrogen inlet and a second diffused gas outlet along the flow direction of the tail gas, wherein the nitrogen inlet is connected with the nitrogen pipeline, and the nitrogen pipeline is provided with a self-standing regulating valve I11; the first diffused air outlet is connected with the high-altitude diffusing device through a first diffused air pipeline, the second diffused air outlet is connected with the high-altitude diffusing device through a second diffused air pipeline, a safety valve 14 is arranged on the first diffused air pipeline, and an electromagnetic valve 12 is arranged on the second diffused air pipeline; and the pressure recording and adjusting alarm instrument PRCA01 on the flash oil tank 1 is controlled by interlocking with the pressure adjusting valve 10 and the electromagnetic valve 12.
And a second self-standing regulating valve 13 is arranged on the combustible gas pipeline.
The process flow of the tail gas treatment system of the kettle type heating modified asphalt reaction kettle is as follows: pumping tail gas of the modified asphalt reaction kettle from the flash oil tank 1 to a tail gas cooler 2 for low-temperature cooling, cooling condensable gas components remained in the tail gas into liquid, and separating the cooled gas-liquid mixture into liquid components through a gas-liquid separator 3; the separated non-condensable combustible gas is subjected to pressure boosting through a tail gas fan 6 and then is divided into two paths, wherein one path of the non-condensable combustible gas is returned to a flash oil tank 1 and is used for stabilizing the system pressure at the upstream of the tail gas fan 6; the other path is sent to an active carbon filter 7 to remove fog drops, and the obtained pure non-condensable combustible gas passes through a safe water seal tank 8 and then is mixed into a gas pipeline at the upstream of the tubular furnace 9, and is sent to the tubular furnace 9 together with the gas for incineration.
And the tail gas cooler 2 is used for carrying out low-temperature cooling on the tail gas by adopting low-temperature water at the temperature of 16-20 ℃.
The middle part of the gas-liquid separator 3 is provided with a clapboard 15 which divides the inner space into a first chamber and a second chamber; the gas-liquid mixture of the tail gas after the low-temperature cooling firstly enters a first chamber of a gas-liquid separator 3 for gas-liquid separation, the separated liquid falls to the bottom of the first chamber, the separated gas is sucked out from the gas-liquid separator 3 from the top, and the gas enters a second chamber after fog drops are removed by a mist catcher 4 and a cyclone separator 5; the separated mist droplets are carried down into the second chamber of the gas-liquid separator 3 by the gas flow, and gas-liquid separation is performed again in the second chamber; the separated liquid falls to the bottom of the second chamber and the separated gas is sent to the tail gas fan 6 through a central duct in the cyclone 5.
And a pressure recording and adjusting alarm instrument PRCA01 is arranged on the flash oil tank 1, and the amount of tail gas entering the flash oil tank 1 is adjusted according to the pressure recording and adjusting alarm instrument PRCA01.
The above, only be the concrete implementation of the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any person skilled in the art is in the technical scope of the present invention, according to the technical solution of the present invention and the utility model, the concept of which is equivalent to replace or change, should be covered within the protection scope of the present invention.
Claims (3)
1. The tail gas treatment system of the kettle type heating method modified asphalt reaction kettle is characterized by comprising a flash oil tank, a tail gas cooler, a gas-liquid separator, a mist catcher, a cyclone separator, a tail gas fan, an active carbon filter, a safe water seal tank and a tubular furnace; the flash oil tank is provided with a tail gas outlet which is connected with an inlet of a tail gas cooler; the middle part of the gas-liquid separator is provided with a clapboard which divides the inner space of the gas-liquid separator into a first chamber and a second chamber; the top of the first chamber is provided with a tail gas inlet and a separated gas outlet, and the top of the second chamber is provided with a cyclone separator; a tail gas inlet on the first chamber is connected with an outlet of the tail gas cooler, a separated gas outlet is connected with an inlet of the mist catcher, and an outlet of the mist catcher is connected with an inlet of the cyclone separator; the middle part of the cyclone separator is provided with a central pipeline, the lower end of the central pipeline is communicated with the second chamber of the gas-liquid separator, the upper end of the central pipeline is sequentially connected with a tail gas fan, an activated carbon filter and a safe water seal tank through a tail gas pipeline, the tubular furnace is provided with a gas inlet which is connected with the gas pipeline, and the safe water seal tank is connected with the gas pipeline through a combustible gas pipeline.
2. The tail gas treatment system of the kettle-type heating asphalt-modifying reaction kettle according to claim 1, wherein the top of the flash oil tank is further provided with a pressure recording and adjusting alarm instrument and a tail gas returning inlet; a tail gas outlet is arranged on a tail gas pipeline between the tail gas fan and the activated carbon filter and is connected with a returned tail gas inlet on the flash evaporation oil tank through a tail gas returning pipeline; the tail gas returning pipeline is sequentially provided with a first diffused gas outlet, a pressure regulating valve, a nitrogen inlet and a second diffused gas outlet along the flow direction of the tail gas, wherein the nitrogen inlet is connected with the nitrogen pipeline, and the nitrogen pipeline is provided with a self-standing regulating valve I; the first diffused air outlet is connected with the high-altitude diffusing device through a first diffused air pipeline, the second diffused air outlet is connected with the high-altitude diffusing device through a second diffused air pipeline, a safety valve is arranged on the first diffused air pipeline, and an electromagnetic valve is arranged on the second diffused air pipeline; and the pressure recording and adjusting alarm instrument on the flash oil tank is controlled by interlocking with the pressure adjusting valve and the electromagnetic valve.
3. The system for treating the tail gas of the kettle-type heating asphalt-modifying reaction kettle according to claim 1, wherein a second self-supporting regulating valve is arranged on the combustible gas pipeline.
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| CN202021925049.5U CN212492204U (en) | 2020-09-04 | 2020-09-04 | Tail gas treatment system of kettle type heating method modified asphalt reaction kettle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957165A (en) * | 2020-09-04 | 2020-11-20 | 中冶焦耐(大连)工程技术有限公司 | Tail gas treatment process and system for kettle type heating modified asphalt reaction kettle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111957165A (en) * | 2020-09-04 | 2020-11-20 | 中冶焦耐(大连)工程技术有限公司 | Tail gas treatment process and system for kettle type heating modified asphalt reaction kettle |
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