A fuel oil treatment system

Abstract

The application provides a fuel oil treatment system, which comprises a filter, a benzene distillation tower, an SRV rectifying device and a cyclohexanone steam air cooler connected in sequence, and the benzene distillation tower is further connected with a benzene vapor air cooler and a benzene buffer tank in sequence. In the system, solid components such as catalysts in the fuel oil are filtered out through the filter, trace benzene is recovered through the benzene distillation tower, the bottom product of the benzene distillation tower is subjected to rectification treatment in the SRV rectifying device, cyclohexanone is obtained at the top, cyclohexanol is obtained at the middle side line, and heavy oil is obtained at the bottom, so that the fuel oil is recycled and utilized, the loss of cyclohexanol and cyclohexanone is reduced, the production cost is lowered, and the recycled material is 120 m 3 per week, which has good practical value. In addition, by adding the cyclohexanone steam air cooler at the rectification section of the SRV rectifying device and adding a reboiler at the stripping section, 66% of the circulating water and 45% of the steam consumption can be saved, and the production cost is further lowered.

Description

Technical Field

[0001] This utility model belongs to the field of fuel oil treatment technology and relates to a fuel oil treatment system. Background Technology

[0002] Fuel oil is mainly made from cracked petroleum residue oil and straight-run residue oil, and it has high viscosity and contains a relatively high amount of non-hydrocarbon compounds, gums and asphaltenes.

[0003] Fuel oil contains some cyclohexanol and cyclohexanone. Because cyclohexanol and cyclohexanone have similar properties and boiling points, separating them through traditional distillation is very expensive and wastes a lot of steam and circulating water, resulting in high costs. Utility Model Content

[0004] The purpose of this invention is to provide a fuel oil processing system to solve the problem of high separation costs for cyclohexanol and cyclohexanone in fuel oil.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This application provides a fuel oil processing system, including a filter, a benzene distillation column, an SRV distillation unit, and a cyclohexanone vapor air cooler connected in sequence. The benzene distillation column is also connected in sequence to the benzene vapor air cooler and a benzene buffer tank.

[0007] Preferably, the SRV distillation apparatus includes a stripping section and a rectification section, the top of the stripping section is connected to the benzene distillation column and the bottom of the rectification section respectively, and the top of the rectification section is connected to the cyclohexanone vapor air cooler.

[0008] Preferably, a reboiler is provided at the bottom of the stripping section.

[0009] Preferably, the SRV distillation apparatus is a distillation apparatus with a temperature of 145-158°C and a pressure of atmospheric pressure.

[0010] Preferably, the system includes two side-by-side filters, both of which are connected to the benzene distillation column.

[0011] Preferably, the bottom of the benzene distillation column is heated by steam condensate.

[0012] Preferably, the benzene distillation column is a distillation column with a top temperature of 80.1°C and a pressure of atmospheric pressure.

[0013] This utility model has the following beneficial effects:

[0014] (1) In this application, after filtering out solid components such as catalysts from the fuel oil, trace amounts of benzene are recovered by distillation in a benzene distillation tower. The bottom product of the benzene distillation tower enters the SRV distillation unit for distillation treatment. Cyclohexanone is obtained from the top of the tower, cyclohexanol is obtained from the middle side stream, and heavy oil is obtained from the bottom of the tower, thus realizing the recovery and utilization of fuel liquid, reducing the loss of cyclohexanol and ketone, and lowering the production cost. It is estimated that the recovered material is 120m³ per week. 3 It has good practical value.

[0015] (2) In this application, by adding a cyclohexanone vapor air cooler in the rectification section of the SRV distillation unit and adding a reboiler in the stripping section, 66% of circulating water and 45% of steam consumption can be saved, further reducing production costs. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the fuel oil processing system provided in the embodiments of this application;

[0017] Symbolic representation:

[0018] 1-Filter, 2-Benzene distillation column, 3-SRV distillation unit, 4-Cyclohexanone vapor air cooler, 5-Benzene vapor air cooler, 6-Benzene buffer tank, 301-Rectifying section, 302-Rectifying section, 303-Reboiler. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] This application provides a fuel oil processing system, which includes a filter 1, a benzene distillation column 2, an SRV distillation unit 3, and a cyclohexanone vapor air cooler 4 connected in sequence. The benzene distillation column 2 is also connected in sequence to a benzene vapor air cooler 5 and a benzene buffer tank 6, as shown in the attached figure. Figure 1 As shown.

[0021] Specifically, fuel oil contains solid impurities such as catalysts, which can affect subsequent distillation operations. Therefore, in this embodiment, solid impurities are filtered out by filter 1, and the filtered fuel oil is then fed into the benzene distillation column 2. This embodiment includes two parallel filters 1 for alternating operation, improving efficiency.

[0022] Fuel oil contains trace amounts of benzene. In this embodiment, the trace benzene is removed from the fuel oil using a benzene distillation column 2. Specifically, under the conditions of a temperature of 80.1°C and a pressure of atmospheric pressure, the fuel oil undergoes a distillation reaction within the benzene distillation column 2, yielding benzene at the top and a distillate at the bottom. By monitoring the composition of the material distilled at the top of the benzene distillation column 2, it is ensured that subsequent operations do not contain benzene. The distilled trace amounts of benzene are condensed into liquid benzene by a benzene vapor air cooler 5, buffered in a benzene buffer tank 6, and then recovered to a benzene storage tank via a benzene pump.

[0023] In this embodiment, the bottom of the benzene distillation column 2 is heated by steam condensate to reach the distillation temperature. The benzene distillation column 2 in this embodiment can also serve as a preheater for the SRV distillation unit 3 to preheat the fuel oil after benzene distillation to the greatest extent possible, thereby increasing the temperature of the fuel oil.

[0024] The fuel oil after benzene distillation in benzene distillation column 2 enters SRV distillation unit 3 to facilitate the separation and recovery of cyclohexanone, cyclohexanol, and high-boiling-point heavy oil. In this embodiment, SRV distillation unit 3 includes a stripping section 301 and a rectification section 302. The top of the stripping section 301 is connected to the benzene distillation column 2 and the bottom of the rectification section 302, respectively, and the top of the rectification section 302 is connected to a cyclohexanone vapor air cooler 4.

[0025] The fuel oil after benzene distillation in benzene distillation column 2 first enters the stripping section 301 of the SRV rectification unit 3, where rectification occurs at a temperature of 145-158℃ and a pressure of atmospheric pressure. The resulting gaseous product enters the rectification section 302 for further rectification. The cyclohexanone produced at the top enters the cyclohexanone vapor air cooler 4 and is condensed into liquid cyclohexanone, which is eventually recovered by a pump. The liquid produced at the bottom is refluxed back to the top of the stripping section 301. Liquid cyclohexanol is produced in the middle of the stripping section 301, and high-boiling-point heavy oil is produced at the bottom, achieving the separation of cyclohexanone, cyclohexanol, and high-boiling-point heavy oil. In the embodiments of this application, the temperature at each rectification plate in the stripping section 301 and the rectification section 302 is determined according to the actual operating conditions.

[0026] In addition, a reboiler 303 is provided at the bottom of the stripping section 301 to facilitate heating of the bottom of the stripping section 301. In this embodiment, an air cooler is used instead of water cooling, which saves the amount of circulating water used and thus reduces production costs.

[0027] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A fuel oil processing system, characterized in that, It includes a filter (1), a benzene distillation column (2), an SRV distillation unit (3), and a cyclohexanone vapor air cooler (4) connected in sequence. The benzene distillation column (2) is also connected in sequence to a benzene vapor air cooler (5) and a benzene buffer tank (6).

2. The fuel oil processing system according to claim 1, characterized in that, The SRV distillation unit (3) includes a stripping section (301) and a rectification section (302). The top of the stripping section (301) is connected to the benzene distillation column (2) and the bottom of the rectification section (302), respectively. The top of the rectification section (302) is connected to the cyclohexanone vapor air cooler (4).

3. The fuel oil processing system according to claim 2, characterized in that, The bottom of the stripping section (301) is equipped with a reboiler (303).

4. The fuel oil processing system according to claim 1, characterized in that, The SRV distillation unit (3) is a distillation unit with a temperature of 145-158℃ and a pressure of atmospheric pressure.

5. The fuel oil processing system according to claim 1, characterized in that, The system includes two side-by-side filters (1), both of which are connected to the benzene distillation column (2).

6. The fuel oil processing system according to claim 1, characterized in that, The bottom of the benzene distillation column (2) is heated by steam condensate.

7. The fuel oil processing system according to claim 1, characterized in that, The benzene distillation column (2) is a distillation column with a top temperature of 80.1℃ and a pressure of atmospheric pressure.

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