CN214571618U - System for using electric heating low-pressure steam for crude benzene distillation - Google Patents
System for using electric heating low-pressure steam for crude benzene distillation Download PDFInfo
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- CN214571618U CN214571618U CN202023139041.9U CN202023139041U CN214571618U CN 214571618 U CN214571618 U CN 214571618U CN 202023139041 U CN202023139041 U CN 202023139041U CN 214571618 U CN214571618 U CN 214571618U
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Abstract
The utility model relates to a coking technical field especially relates to a system for be used for crude benzol distillation with electrical heating low pressure steam. Comprises an oil-rich heater, an electric heater, a regenerator and a debenzolization tower; the first low-pressure saturated steam pipeline is connected with an inlet at one side of the rich oil heater, the rich oil pipeline is connected with an inlet at the other side of the rich oil heater, and an outlet of the rich oil heater is connected with the debenzolization tower; the second low-pressure saturated steam pipeline is connected with an electric heater, the electric heater is connected with the inlet of the regenerator through a pipeline, and the outlet of the regenerator is connected with the debenzolization tower through a pipeline. The utility model discloses a rich oil of low pressure saturated steam heating adopts electric heater to realize that steam is overheated, avoids using the superheated steam of middling pressure, realizes that crude benzol distillation operation does not receive the restriction of the superheated steam vapour source of middling pressure, and rational utilization low-grade heat source, production flexible operation. Not only saves the occupied area of equipment, reduces the equipment investment and simplifies the production operation, but also solves the problems of waste gas generated by gas combustion and environmental pollution.
Description
Technical Field
The utility model relates to a coking technical field especially relates to a system for be used for crude benzol distillation with electrical heating low pressure steam.
Background
At present, the process for producing crude (light) benzene in a coking plant generally adopts a liquid absorption method, coal gas is sent into a benzene washing tower, washing oil is used for washing and removing benzene media to obtain benzene-rich washing oil (rich oil), the rich oil is sent into a debenzolization tower for distillation after being heated to about 180 ℃, and the rich oil is sent into the benzene washing tower for recycling after being debenzolized.
The crude benzene distillation needs external heat supply and is mainly used for heating rich oil and low-pressure steam, the two main heating processes are adopted at present, one is that a tubular furnace is adopted to burn coal gas to heat the rich oil and the low-pressure steam, the rich oil is heated and then sent to a debenzolization tower for distillation, the low-pressure steam which is heated to obtain overheat is sent to a regenerator for recycling washing oil for regeneration, and the top oil steam of the regenerator is sent to the bottom of the debenzolization tower for steam stripping. With the increasingly strict environmental requirements, the exhaust gas outside the tube furnace cannot meet the discharge standard of pollutants for coking chemical industry of GB16171-2012, and the heating process of the combustion gas of the tube furnace is limited. The other is to use the medium-pressure superheated steam (the lowest pressure is 3.8MPa and the temperature is 450 ℃) generated by a coke oven matching dry quenching system, one part of the medium-pressure superheated steam is heated by a rich oil heater to be rich in oil, and the other part of the medium-pressure superheated steam is decompressed (the pressure is reduced to 0.3MPa) and then sent to a regenerator to carry out oil washing regeneration and stripping of a debenzolization tower. The heating process avoids the pollution of waste gas generated by burning coal gas in the tubular furnace to the environment, but the pressure reducing valve is used for losing a large amount of steam energy, so that the unreasonable use problem of waste heat steam exists in the heating process by utilizing the medium-pressure superheated steam in the dry quenching. Theoretically, the saturated steam of 1.2MPa (g) can be used to satisfy the rich oil heating condition.
With the high-speed development of the coking industry, the energy utilization structure is optimized, the step utilization of energy is adopted, and the reasonable use of the energy is very important. Therefore, an energy source which can be effectively and reasonably utilized for heating the rich oil and the steam in the crude benzene distillation system is found, and the economic significance and the social significance are achieved.
CN104403704A discloses a steam heating wash oil negative pressure crude benzene distillation process and equipment, and relates to a steam heating wash oil negative pressure crude benzene distillation process and equipment, rich oil is heated to 160-200 ℃ by superheated steam and then enters a debenzolization tower, a vacuum pump or an ejector is used for sucking non-condensable gas of a debenzolization system, the debenzolization tower is in a negative pressure operation state, steam is used for steam blowing in a regenerator to regenerate wash oil, and oil-containing steam or fresh superheated steam from the regenerator is used for steam blowing benzene substances in wash oil in the debenzolization tower.
CN208883741U discloses a medium-low pressure steam heating device in a crude benzene distillation system, which comprises a low pressure steam heat exchanger, an oil-rich heat exchanger, a debenzolization tower and a regenerator. This utility model discloses earlier utilize the medium pressure superheated steam through low pressure steam heat exchanger, heat low pressure steam to overheated, overheated low pressure steam is sent to the regenerator, goes out the medium pressure superheated steam of low pressure steam heat exchanger and gets into rich oil heat exchanger heating rich oil, and the rich oil that goes out the rich oil heat exchanger connects to the debenzolization tower.
Above two utility model all use middling pressure steam heating medium at crude benzene distillation system, make crude benzene distillation operation receive the restriction of upper reaches middling pressure superheated steam vapour source, produce vapour device as the upper reaches and subtract the product and overhaul, must influence crude benzene distillation production.
SUMMERY OF THE UTILITY MODEL
In order to overcome the defects of the prior art, the utility model provides an electric heating low-pressure steam is used for the system of crude benzene distillation, so that the heating operation of the crude benzene distillation system is more flexible and is not limited by a medium-pressure steam source.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a system for distilling crude benzene by electrically heating low-pressure steam comprises an oil-rich heater, an electric heater, a regenerator and a debenzolization tower; the first low-pressure saturated steam pipeline is connected with an inlet at one side of the rich oil heater, the rich oil pipeline is connected with an inlet at the other side of the rich oil heater, and an outlet of the rich oil heater is connected with the debenzolization tower; the second low-pressure saturated steam pipeline is connected with an electric heater, the electric heater is connected with the inlet of the regenerator through a pipeline, and the outlet of the regenerator is connected with the debenzolization tower through a pipeline.
The electric heater adopts electromagnetic, infrared or resistance heating.
The electric heater is provided with a temperature sensor.
Compared with the prior art, the beneficial effects of the utility model are that:
1) compared with the crude benzene distillation process by a gas tube furnace heating method, the utility model discloses replace gas tube heating furnace with rich oil heater and electric heater, both save equipment and take up an area of, reduce equipment investment, simplify production operation, solved the problem that gas burning produced waste gas, polluted environment again.
2) Compare with utilizing middling pressure steam heating method crude benzol distillation technology, the utility model discloses a rich oil of low pressure saturated steam heating adopts electric heater to realize that steam is overheated, avoids using middling pressure superheated steam, realizes that crude benzol distillation operation does not receive the restriction of middling pressure superheated steam vapour source, and rational utilization low-grade heat source, production flexible operation.
Drawings
Fig. 1 is a schematic structure and a schematic process diagram of the present invention.
In the figure: 1-debenzolization tower 2-regenerator 3-rich oil heater 5-rich oil 6-heated rich oil 10-oil gas 11-flow measurement interlocking device 12-flow control valve I13-flow measurement interlocking operation device 14-flow control valve II 15-temperature measurement device 24-first low-pressure saturated steam 25-second low-pressure saturated steam 26-electric heater 27-low-pressure superheated steam 28-temperature sensor 29-temperature measurement interlocking device
Detailed Description
The following description of the embodiments of the present invention will be made with reference to the accompanying drawings:
as shown in figure 1, a system for distilling crude benzene by electrically heating low-pressure steam comprises an oil-rich heater 3, an electric heater 26, a regenerator 2 and a debenzolization tower 1. The first low-pressure saturated steam pipeline is connected with an inlet at one side of the rich oil heater 3, the rich oil pipeline is connected with an inlet at the other side of the rich oil heater 3, and an outlet of the rich oil heater 3 is connected with the debenzolization tower 1. The second low-pressure saturated steam pipeline is connected with an electric heater 26, the electric heater 26 is connected with the inlet of the regenerator 2 through a pipeline, and the outlet of the regenerator 2 is connected with the debenzolization tower 1 through a pipeline.
The electric heater 26 adopts electromagnetic, infrared or resistance heating, and the electric heater 26 is provided with a temperature sensor 28, so that the overheating temperature of the second low-pressure saturated steam 25 is controlled. The utility model discloses be equipped with temperature measurement interlock 29 interlocking electric heater 26 switch, set up overtemperature overheat protection.
The rich oil pipeline is provided with a flow measurement interlocking device 11 and a flow control valve I12, and the first low-pressure saturated steam pipeline is provided with a flow measurement interlocking operation device 13, a flow control valve II 14 and a temperature measurement device 15.
The utility model is suitable for a crude benzene of ordinary pressure or light benzene distillation and crude benzene of decompression or light benzene distillation, theory of operation and working process specifically include following step:
1) the pressure of the first low-pressure saturated steam 24 is 1.2MPa or more. The first low-pressure saturated steam 24 is conveyed to the rich oil heater 3 through a first low-pressure saturated steam pipeline, the rich oil 5 is heated by the first low-pressure saturated steam 24 through the rich oil heater, and the rich oil 5 is heated to 160-190 ℃ from 120-150 ℃;
2) conveying the heated rich oil 6 to a debenzolization tower 1 for distillation;
3) the pressure of the second low-pressure saturated steam 25 is 0.1-0.7 MPa. The second low-pressure saturated steam 25 is conveyed to the electric heater 26 through a second low-pressure saturated steam pipeline, is heated to 300-450 ℃ by the electric heater 26, is superheated to generate low-pressure superheated steam 27, and is conveyed to the regenerator 2, and then the oil gas 10 is conveyed to a debenzolization tower for stripping crude benzene.
The utility model discloses replace gas pipe formula heating furnace with rich oil heater 3 and electric heater 26, both saved equipment area, reduced equipment investment, simplified production operation, solved gas combustion again and produced waste gas, the problem of polluted environment.
The utility model discloses a 24 heating rich oil 5 of first low pressure saturated steam adopt electric heater 26 to realize that steam is overheated, avoid using the superheated steam of middling pressure, realize that crude benzol distillation operation does not receive the restriction of the superheated steam vapour source of middling pressure, the low-grade heat source of rational utilization, production flexible operation.
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. A system for distilling crude benzene by electrically heating low-pressure steam is characterized by comprising an oil-rich heater, an electric heater, a regenerator and a debenzolization tower; the first low-pressure saturated steam pipeline is connected with an inlet at one side of the rich oil heater, the rich oil pipeline is connected with an inlet at the other side of the rich oil heater, and an outlet of the rich oil heater is connected with the debenzolization tower; the second low-pressure saturated steam pipeline is connected with an electric heater, the electric heater is connected with the inlet of the regenerator through a pipeline, and the outlet of the regenerator is connected with the debenzolization tower through a pipeline.
2. The system for distillation of crude benzene using electrically heated low pressure steam as claimed in claim 1, wherein: the electric heater adopts electromagnetic, infrared or resistance heating.
3. The system for distillation of crude benzene using electrically heated low pressure steam as claimed in claim 1, wherein: the electric heater is provided with a temperature sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023139041.9U CN214571618U (en) | 2020-12-23 | 2020-12-23 | System for using electric heating low-pressure steam for crude benzene distillation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023139041.9U CN214571618U (en) | 2020-12-23 | 2020-12-23 | System for using electric heating low-pressure steam for crude benzene distillation |
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| Publication Number | Publication Date |
|---|---|
| CN214571618U true CN214571618U (en) | 2021-11-02 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202023139041.9U Active CN214571618U (en) | 2020-12-23 | 2020-12-23 | System for using electric heating low-pressure steam for crude benzene distillation |
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| Country | Link |
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| CN (1) | CN214571618U (en) |
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2020
- 2020-12-23 CN CN202023139041.9U patent/CN214571618U/en active Active
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