阅读说明：本技术 一种用于煤焦油蒸汽脱苯的装置及其方法 (Device and method for debenzolizing coal tar steam ) 是由 姚良雨 张颂 李枫 刘家祺 于 2020-03-16 设计创作，主要内容包括：本发明公开了一种用于煤焦油蒸汽脱苯的装置,包括蒸汽塔和通过管道依次连接的洗苯塔、焦油换热器、焦油加热器、脱苯塔和脱苯焦油冷却器,脱苯焦油冷却器的输出端设置与其管道连接的脱苯焦油收集池,焦油加热器的输出端分别设置与其管道连接的富油再生器和闪蒸罐,蒸汽塔的输出端分别与焦油加热器、脱苯塔和富油再生器的输入端管道连接,富油再生器的输出端设置与其管道连接的再生焦油收集池,本发明的有益效果是：避免了有害气体释放造成大气污染和加热过程中存在漏油着火、回火爆炸风险,高压蒸汽加热的温度稳定,避免富油中不饱和化合物在高温下发生聚合反应速率加快,加速循环洗油恶化,提高了富油洗苯的效率同时减少了洗油的消耗。(The invention discloses a device for coal tar steam debenzolization, which comprises a steam tower, a benzene washing tower, a tar heat exchanger, a tar heater, a debenzolization tower and a debenzolization tar cooler, wherein the benzene washing tower, the tar heat exchanger, the tar heater, the debenzolization tower and the debenzolization tar cooler are sequentially connected through a pipeline, a debenzolization tar collecting pool connected with the pipeline is arranged at the output end of the debenzolization tar cooler, an oil-rich regenerator and a flash tank connected with the pipeline are respectively arranged at the output end of the tar heater, the output end of the steam tower is respectively connected with the input end pipelines of the tar heater, the debenzolization tower and the oil-rich regenerator, and a regeneration tar collecting pool connected with the pipeline is arranged at: the method avoids atmospheric pollution caused by harmful gas release and risks of oil leakage ignition and tempering explosion in the heating process, has stable temperature of high-pressure steam heating, avoids the polymerization reaction rate acceleration of unsaturated compounds in the rich oil at high temperature, accelerates the deterioration of circulating wash oil, improves the efficiency of rich oil benzene washing, and reduces the consumption of wash oil.)

1. A device for coal tar steam debenzolization is characterized in that: including steam tower and the benzene washing tower that connects gradually through the pipeline, the tar heat exchanger, the tar heater, debenzolization tower and debenzolization tar cooler, the output setting of debenzolization tar cooler takes off benzene tar collecting pit rather than the pipe connection, the output of tar heater sets up respectively rather than the rich oil regenerator and the flash tank of pipe connection, the output of steam tower respectively with the tar heater, the input pipe connection of debenzolization tower and rich oil regenerator, the output setting of rich oil regenerator is rather than the regeneration tar collecting pit of pipe connection.

2. The apparatus for coal tar steam debenzolization as set forth in claim 1, characterized in that: the middle part of the pipeline connecting the tar heater and the flash tank is provided with a pressure reducing valve and a drain valve, wherein the input end of the pressure reducing valve is connected with the steam outlet pipeline of the tar heater, and the output end of the pressure reducing valve is connected with the input end pipeline of the drain valve.

3. The apparatus for coal tar steam debenzolization as set forth in claim 2, characterized in that: the output end of the drain valve is connected with the input end of the flash tank through a pipeline, and the output end of the flash tank is connected with the input end of the steam tower through a pipeline.

4. The apparatus for coal tar steam debenzolization as set forth in claim 1, characterized in that: the middle part of the pipeline connecting the debenzolization tar cooler and the debenzolization tar collecting tank is provided with a three-way connecting piece, and the three-way connecting piece is connected with the input end of the benzene washing tower through the pipeline.

5. The apparatus for coal tar steam debenzolization as set forth in claim 1, characterized in that: the pipeline for connecting the steam tower and the tar heater is provided with a first air pressure pump, the input end of the first air pressure pump is connected with the output end pipeline of the steam tower, and the output end of the first air pressure pump is connected with the input end pipeline of the tar heater.

6. The apparatus for coal tar steam debenzolization as set forth in claim 1, characterized in that: the pipeline for connecting the steam tower and the debenzolization tower is provided with a second pneumatic pump, the input end of the second pneumatic pump is connected with the output end pipeline of the steam tower, and the output end of the second pneumatic pump is connected with the input end pipeline of the debenzolization tower.

7. The apparatus for coal tar steam debenzolization as set forth in claim 1, characterized in that: the pipeline connecting the steam tower and the rich oil regenerator is provided with a third pneumatic pump, the input end of the third pneumatic pump is connected with the output end pipeline of the steam tower, and the output end of the third pneumatic pump is connected with the rich oil regenerator pipeline

8. A method for heating and debenzolizing rich oil steam, which comprises the device for debenzolizing coal tar steam as claimed in any one of claims 1 to 7, and is characterized by comprising the following steps:

s1, benzene-containing rich oil is washed by a benzene washing tower and then is introduced into a tar heat exchanger through a pipeline, the temperature of the rich oil is raised to 145 ℃, the rich oil is added into a tar heater, steam in a steam tower is conveyed to the tar heater through a first air pressure pump, the steam pressure introduced into the tar heater is not less than 0.3MPa, the rich oil is heated to 175-180 ℃, then the rich oil enters a debenzolization tower through a pipeline, the steam conveyed by a second air pressure pump is introduced into the debenzolization tower to carry out steam stripping distillation debenzolization, a part of the debenzolized lean oil is cooled by a debenzolization tar cooler and then enters the benzene washing tower through the pipeline for secondary debenzolization cycle, and the other part of the debenzolization tar collection pool through the pipeline for.

S2, allowing the heated rich oil in the part of the tar heater to enter a rich oil regenerator through a pipeline, introducing steam conveyed by a third air pressure pump into the rich oil regenerator for steam stripping distillation, allowing the regenerated rich oil to enter a regenerated tar collecting tank through a pipeline for collection, allowing saturated water generated by the tar heater to enter a flash tank through a pressure reducing valve and a drain valve, and allowing the flash tank to convert the saturated water into steam and convey the steam to a steam tower through a pipeline for reutilization.

Technical Field

The invention belongs to the technical field of coal coking, and particularly relates to a device and a method for debenzolizing coal tar steam.

Background

Crude benzene is an important chemical raw material and is one of main products of coking enterprises. The traditional coking crude benzene production usually adopts a mode of heating coal tar and low-pressure steam by using a tubular furnace, and in the actual production, the tubular furnace is found to be used for heating, so that in the aspect of environmental protection, harmful gases such as CO2, CO, NOx, SOx and the like can be generated in the tubular furnace heating mode, and the risk of atmospheric pollution exists; in the aspect of safety, the tubular furnace has the risks of oil leakage, ignition and tempering explosion in the heating process, in the aspect of energy conservation and consumption reduction, the temperature in the tubular furnace can reach more than 700 ℃ in the heating mode, and the polymerization reaction rate of unsaturated compounds in the coal tar is accelerated at high temperature due to the long-term circulation of rich oil at high temperature, so that the deterioration of circulating wash oil is accelerated, the benzene washing efficiency is influenced, and the consumption of the wash oil is increased.

Disclosure of Invention

The invention aims to provide a device for coal tar steam debenzolization, which avoids atmospheric pollution and oil leakage ignition.

In order to achieve the purpose, the invention adopts the technical scheme that:

the invention discloses a device for coal tar steam debenzolization, which comprises a steam tower, a benzene washing tower, a tar heat exchanger, a tar heater, a debenzolization tower and a debenzolization tar cooler, wherein the benzene washing tower, the tar heat exchanger, the tar heater, the debenzolization tower and the debenzolization tar cooler are sequentially connected through a pipeline, a debenzolization tar collecting pool connected with the pipeline is arranged at the output end of the debenzolization tar cooler, an oil-rich regenerator and a flash tank connected with the pipeline are respectively arranged at the output end of the tar heater, the output end of the steam tower is respectively connected with the input end pipelines of the tar heater, the debenzolization tower and the oil-rich regenerator, and a regeneration tar collecting pool.

The invention discloses a device for coal tar steam debenzolization, wherein a pressure reducing valve and a drain valve are arranged in the middle of a pipeline connecting a tar heater and a flash tank, wherein the input end of the pressure reducing valve is connected with a steam outlet pipeline of the tar heater, and the output end of the pressure reducing valve is connected with the input end of the drain valve.

The invention discloses a device for coal tar steam debenzolization, wherein the output end of a drain valve is connected with the input end of a flash tank through a pipeline, and the output end of the flash tank is connected with the input end of a steam tower through a pipeline.

The invention discloses a device for coal tar steam debenzolization, wherein a tee joint piece is arranged in the middle of a pipeline connecting a debenzolization tar cooler and a debenzolization tar collecting tank, and is connected with the input end of a benzene washing tower through a pipeline.

The invention discloses a device for coal tar steam debenzolization, wherein a first air pressure pump is arranged on a pipeline connecting a steam tower and a tar heater, the input end of the first air pressure pump is connected with an output end pipeline of the steam tower, and the output end of the first air pressure pump is connected with an input end pipeline of the tar heater.

The invention discloses a device for coal tar steam debenzolization, wherein a second pneumatic pump is arranged on a pipeline connecting a steam tower and a debenzolization tower, the input end of the second pneumatic pump is connected with the output end pipeline of the steam tower, and the output end of the second pneumatic pump is connected with the input end pipeline of the debenzolization tower.

The invention discloses a device for removing benzene from coal tar steam.

The invention discloses a method for heating and debenzolizing rich oil steam, which comprises the following steps:

s1, benzene-containing rich oil is washed by a benzene washing tower and then is introduced into a tar heat exchanger through a pipeline, the temperature of the rich oil is raised to 145 ℃, the rich oil is added into a tar heater, steam in a steam tower is conveyed to the tar heater through a first air pressure pump, the steam pressure introduced into the tar heater is not less than 0.3MPa, the rich oil is heated to 175-180 ℃, then the rich oil enters a debenzolization tower through a pipeline, the steam conveyed by a second air pressure pump is introduced into the debenzolization tower to carry out steam stripping distillation debenzolization, a part of the debenzolized lean oil is cooled by a debenzolization tar cooler and then enters the benzene washing tower through the pipeline for secondary debenzolization cycle, and the other part of the debenzolization tar collection pool through the pipeline for.

S2, allowing the heated rich oil in the part of the tar heater to enter a rich oil regenerator through a pipeline, introducing steam conveyed by a third air pressure pump into the rich oil regenerator for steam stripping distillation, allowing the regenerated rich oil to enter a regenerated tar collecting tank through a pipeline for collection, allowing saturated water generated by the tar heater to enter a flash tank through a pressure reducing valve and a drain valve, and allowing the flash tank to convert the saturated water into steam and convey the steam to a steam tower through a pipeline for reutilization.

The technical scheme disclosed by the invention is adopted, a steam tower, a benzene washing tower, a tar heat exchanger, a tar heater, a debenzolization tower and a debenzolization tar cooler are arranged and sequentially connected through a pipeline, a debenzolization tar collecting pool connected with the pipeline is arranged at the output end of the debenzolization tar cooler, an oil-rich regenerator and a flash tank connected with the pipeline are respectively arranged at the output end of the tar heater, the output end of the steam tower is respectively connected with the input ends of the tar heater, the debenzolization tower and the oil-rich regenerator, a regeneration tar collecting pool connected with the pipeline is arranged at the output end of the oil-rich regenerator, benzene-containing rich oil enters the tar heat exchanger and the tar heater after passing through the benzene washing tower, the heated rich oil is respectively introduced into the oil-rich regenerator and the debenzolization tower through the pipeline, the rich oil is converted into lean oil through the debenzolization tower by stripping distillation and debenzolization, then is introduced into the debenzo, harmful gas is not generated and released in the debenzolization process, so that the pollution of the atmosphere is relieved; the rich oil is heated by steam, so that the risk of oil leakage ignition and tempering explosion of the tubular furnace in the heating process is avoided, the temperature in the tar heater is stable by adopting a high-pressure steam heating mode, the polymerization reaction rate of unsaturated compounds in the rich oil is prevented from being accelerated at high temperature due to the fact that the rich oil circulates at high temperature for a long time, the circulating wash oil deterioration is accelerated, the efficiency of rich oil benzene washing is improved, and the consumption of wash oil is reduced.

Drawings

The contents of the drawings and the reference numerals in the drawings are briefly described as follows:

FIG. 1 is a schematic diagram of a device for debenzolization of coal tar vapors;

the labels in the above figures are: 1. a benzene washing tower; 2. a tar heat exchanger; 3. a tar heater; 4. a debenzolization tower; 5. a benzene-removed tar cooler; 6. a debenzolization tar collecting tank; 7. a steam tower; 8. an oil-rich regenerator; 9. a regenerated tar collecting tank; 10. a pressure reducing valve; 11. a drain valve; 12. a flash tank; 13. a first air pressure pump; 14. a second pneumatic pump; 15. a third pneumatic pump; 16. tee joint spare.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

FIG. 1 is a schematic structural diagram of a device for coal tar steam debenzolization of the present invention, as shown in the figure:

the invention discloses a coal tar steam debenzolization device, which comprises a steam tower 7, a benzene washing tower 1, a tar heat exchanger 2, a tar heater 3, a debenzolization tower 4 and a debenzolization tar cooler 5 which are sequentially connected through pipelines, wherein the output end of the debenzolization tar cooler 5 is provided with a debenzolization tar collecting tank 6 connected with the pipelines, the output end of the tar heater 3 is respectively provided with an oil-rich regenerator 8 and a flash tank 12 which are connected with the pipelines, the output end of the steam tower 7 is respectively connected with the input ends of the tar heater 3, the debenzolization tower 4 and the oil-rich regenerator 8 through pipelines, and the output end of the oil-rich regenerator 8 is provided with a regeneration tar collecting tank 9 connected with the pipelines.

The middle part of the pipeline connecting the tar heater 3 and the flash tank 12 is provided with a pressure reducing valve 10 and a drain valve 11, wherein the input end of the pressure reducing valve 10 is connected with the steam outlet pipeline of the tar heater 3, and the output end is connected with the input end pipeline of the drain valve 11.

The output end of the drain valve 11 is connected with the input end of the flash tank 12 through a pipeline, and the output end of the flash tank 12 is connected with the input end of the steam tower 7 through a pipeline.

The middle part of the pipeline connecting the debenzolization tar cooler 5 and the debenzolization tar collecting tank 6 is provided with a three-way connecting piece 16, and the three-way connecting piece 16 is connected with the input end of the benzene washing tower 1 through the pipeline.

The pipeline connecting the steam tower 7 and the tar heater 3 is provided with a first air pressure pump 13, the input end of the first air pressure pump 13 is connected with the output end pipeline of the steam tower 7, and the output end is connected with the input end pipeline of the tar heater 3.

The pipeline connecting the steam tower 7 and the debenzolization tower 4 is provided with a second pneumatic pump 14, the input end of the second pneumatic pump 14 is connected with the output end pipeline of the steam tower 7, and the output end is connected with the input end pipeline of the debenzolization tower 4.

The pipeline connecting the steam tower 7 and the rich oil regenerator 8 is provided with a third pneumatic pump 15, the input end of the third pneumatic pump 15 is connected with the output end pipeline of the steam tower 7, and the output end is connected with the rich oil regenerator 8.

Benzene-containing rich oil is subjected to benzene washing in a benzene washing tower 1 and then is introduced into a tar heat exchanger 2 through a pipeline, the temperature of the rich oil is raised to 145 ℃, the rich oil is added into a tar heater 3, steam in a steam tower 7 is conveyed to the tar heater 3 through a first pneumatic pump 13, the steam pressure introduced into the tar heater 3 is not less than 0.3MPa, the rich oil is heated to 175-180 ℃, then the rich oil enters a debenzolization tower 4 through a pipeline, steam conveyed through a second pneumatic pump 14 is introduced into the debenzolization tower 4 to carry out steam stripping distillation debenzolization on the rich oil, a part of the debenzolized lean oil after being cooled in a debenzolization tar cooler 5 enters the benzene washing tower 1 through a pipeline for secondary debenzolization circulation, and the other part of the debenzolization tar enters a debenzolization.

Rich oil after heating in the tar heater 3 enters a rich oil regenerator 8 through a pipeline, steam conveyed by a third pneumatic pump 15 is introduced into the rich oil regenerator 8 for steam stripping distillation, regenerated rich oil enters a regenerated tar collecting tank 9 through a pipeline for collection, saturated water generated by the tar heater 3 enters a flash tank 12 through a pressure reducing valve 10 and a drain valve 11, the flash tank 12 converts the saturated water into steam and conveys the steam to a steam tower 7 through a pipeline for reutilization

The technical scheme disclosed by the invention is adopted, a steam tower 7 and a benzene-washing tower 1, a tar heat exchanger 2, a tar heater 3, a debenzolization tower 4 and a debenzolization tar cooler 5 which are sequentially connected through pipelines are arranged, the output end of the debenzolization tar cooler 5 is provided with a debenzolization tar collecting pool 6 connected with the pipelines, the output end of the tar heater 3 is respectively provided with an oil-rich regenerator 8 and a flash tank 12 which are connected with the pipelines, the output end of the steam tower 7 is respectively connected with the input ends of the tar heater 3, the debenzolization tower 4 and the oil-rich regenerator 8, the output end of the oil-rich regenerator 8 is provided with a regeneration tar collecting pool 9 connected with the pipelines, the benzene-containing rich oil enters the tar heat exchanger 2 and the tar heater 3 after passing through the benzene-washing tower 1, the heated rich oil is respectively introduced into the oil-rich regenerator 8 and the debenzolization tower 4 through the pipelines, the debenzolization tar cooler 5 is introduced into the benzene-washing tower 1 for cooling and debenzolization after the rich oil is converted, harmful gas is not generated and released in the debenzolization process, so that the pollution of the atmosphere is relieved; the rich oil is heated by steam, so that the risk of oil leakage ignition and tempering explosion of the tubular furnace in the heating process is avoided, the temperature in the tar heater is stable by adopting a high-pressure steam heating mode, the polymerization reaction rate of unsaturated compounds in the rich oil is prevented from being accelerated at high temperature due to the fact that the rich oil circulates at high temperature for a long time, the circulating wash oil deterioration is accelerated, the efficiency of rich oil benzene washing is improved, and the consumption of wash oil is reduced.

The invention has been described above with reference to the accompanying drawings, it is obvious that the invention is not limited to the specific implementation in the above-described manner, and it is within the scope of the invention to apply the inventive concept and solution to other applications without substantial modification.