Rich oil circulating device of benzene washing tower

Abstract

The utility model relates to the technical field of negative pressure debenzolization, in particular to a rich oil circulating device of a benzene washing tower, which comprises a benzene washing tower body, a first feeding pipe connected to the top of the benzene washing tower body, a discharging pipe connected to the bottom of the benzene washing tower body, an oil-water separator connected to one end of the discharging pipe, a rich oil circulating pump arranged at the top of the oil-water separator, and a second feeding pipe connected to the bottom of the benzene washing tower body. One end of one pipeline of the rich oil circulating pump extends into the oil area of the oil-water separator, a connecting pipe is arranged at one end of the first feeding pipe, one end of the other pipeline of the rich oil circulating pump is connected with one pipeline of the connecting pipe, and a communicating valve is installed on the other pipeline of the rich oil circulating pump. According to the device, the rich oil circulating pump is additionally arranged behind the benzene washing tower body, and part of rich oil after benzene washing is circulated to the top of the benzene washing tower body to be continuously sprayed, so that the contact area of coal gas and washing oil is increased, the benzene washing effect is enhanced, and the benzene elution efficiency is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of negative pressure benzene removal, in particular to an oil-rich circulation device of a benzene washing tower. Background Art

[0002] At present, the negative pressure debenzening process usually takes the principle of distillation as the core of the process. Through the connection and utilization of liquid pressure, boiling point and volatilization in this principle, the decompression work of the debenzening tower with a vacuum pump as the infrastructure is realized. At the same time, by reducing the surface pressure of the rich oil in the debenzening tower, the boiling point of the components inside the rich oil will also be reduced accordingly, thereby realizing the distillation debenzening operation under the condition of lower operating temperature than the normal pressure debenzening process.

[0003] However, in the benzene removal process, after the material is discharged from the bottom of the benzene washing tower, the lean oil contains more benzene, which in turn affects the benzene washing effect, resulting in low benzene removal efficiency. Utility Model Content

[0004] The utility model aims to solve the problem in the prior art that after the bottom of the benzene washing tower is discharged, the lean oil contains more benzene, which affects the benzene washing effect and makes the benzene elution efficiency low, and proposes a rich oil circulation device for the benzene washing tower.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A rich oil circulation device for a benzene washing tower is designed, comprising a benzene washing tower body, a first feed pipe is connected to the top of the benzene washing tower body, a discharge pipe is connected to the bottom of the benzene washing tower body, one end of the discharge pipe is connected to an oil-water separator, an oil-rich circulation pump is arranged on the top of the oil-water separator, one end of one of the pipelines of the oil-rich circulation pump extends to the oil area of ​​the oil-water separator, a connecting pipe is arranged at one end of the first feed pipe, one end of the other pipeline of the oil-rich circulation pump is connected to one pipeline of the connecting pipe, and a connecting valve is installed on the other pipeline of the oil-rich circulation pump.

[0007] Preferably, the connecting pipe is configured as a three-way pipe, one end of the connecting pipe is connected to the second feed pipe, and a first pressure gauge is installed on the connecting pipe.

[0008] Preferably, a second pressure gauge is installed on the pipeline of the oil-rich circulation pump at the bottom of the connecting valve.

[0009] Preferably, a corrosion-resistant coating is provided inside the pipeline of the oil-rich circulation pump.

[0010] Preferably, the connecting valve is configured as a one-way valve.

[0011] The utility model proposes an oil-rich circulation device for a benzene washing tower, which has the beneficial effect that: the oil-rich circulation device for the benzene washing tower connects a carbon steel pipeline to the outlet of a newly added oil-rich circulation pump by opening a hole on the benzene washing tower body, and circulates part of the rich oil after benzene washing to the top of the benzene washing tower body through the newly installed oil-rich circulation pump for continuous spraying, so that part of the rich oil returns to the benzene washing tower body to wash benzene again, thereby reducing the benzene content in the material that is first debenzenized, thereby enhancing the benzene washing effect, thereby improving the benzene washing efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 The utility model discloses a structural schematic diagram of an oil-rich circulation device for a benzene washing tower.

[0013] Figure 2 The utility model provides a structural schematic diagram of a partial structural cross-sectional view of an oil-rich circulation device for a benzene washing tower.

[0014] Figure 3 for Figure 2 A partial enlarged view of point A.

[0015] In the figure: 1. benzene washing tower body; 2. first feed pipe; 3. discharge pipe; 4. oil-water separator; 5. oil-rich circulation pump; 6. connecting pipe; 7. connecting valve; 8. second feed pipe; 9. first pressure gauge; 10. second pressure gauge; 11. bracket; 12. stirring blade. DETAILED DESCRIPTION

[0016] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0017] Example 1

[0018] Reference Figure 1-3 A rich oil circulation device for a benzene washing tower comprises a benzene washing tower body 1, a first feed pipe 2 is connected to the top of the benzene washing tower body 1, a discharge pipe 3 is connected to the bottom of the benzene washing tower body 1, one end of the discharge pipe 3 is connected to an oil-water separator 4, an oil-rich circulation pump 5 is arranged on the top of the oil-water separator 4, one end of one pipeline of the oil-rich circulation pump 5 extends to the oil area inside the oil-water separator 4, a connecting pipe 6 is arranged at one end of the first feed pipe 2, one end of the other pipeline of the oil-rich circulation pump 5 is connected to a pipeline of the connecting pipe 6, a connecting valve 7 is installed on the other pipeline of the oil-rich circulation pump 5, and the connecting valve 7 is arranged as a one-way valve.

[0019] The connecting valve 7 is set as a one-way valve to prevent the lean oil in the connecting pipe 6 from flowing back into the oil-water separator 4 through the pipeline; a bracket 11 is installed in the connecting pipe 6, and a stirring blade 12 is installed on the bracket 11. The lean oil will rotate with the stirring blade 12 during the flow process. Combined with the reflux of rich oil, the rich oil and the lean oil can be stirred by the bracket 11 and the stirring blade 12, so that the mixing effect of the lean oil and the rich oil is better, so that the benzene in the lean oil is dispersed more evenly, thereby improving the debenzenization effect of the benzene washing tower body 1 on the material.

[0020] After the benzene washing tower body 1 is working, the discharge pipe 3 at the bottom of the benzene washing tower body 1 will deliver the material to the oil-water separator 4, and then the rich oil circulation pump 5 will return the rich oil in the oil-water separator 4 through the pipeline through the one-way valve to the connecting pipe 6, and then return to the benzene washing tower body 1 through the first feed pipe 2. When the rich oil goes back, the rich oil and the lean oil will be mixed due to the impact of the rich oil circulation pump 5 on the connecting pipe 6, and part of the rich oil after benzene washing will be circulated to the top of the benzene washing tower body for continuous spraying, so that part of the rich oil returns to the benzene washing tower body 1 for debenzenization again, thereby reducing the amount of material for the first debenzenization of the first feed pipe 2, and the benzene contained in the material for the second debenzenization itself will also be reduced, so that the benzene content in the mixed debenzenized material is also reduced, thereby enhancing the benzene washing effect.

[0021] Example 2

[0022] Based on Example 1, optimization is performed. Figure 1-3 The connecting pipe 6 is configured as a three-way pipe, one end of which is connected to a second feed pipe 8, a first pressure gauge 9 is installed on the connecting pipe 6, a second pressure gauge 10 is installed on the pipeline of the oil-rich circulation pump 5 at the bottom of the connecting valve 7, and a corrosion-resistant coating is provided inside the pipeline of the oil-rich circulation pump 5.

[0023] The connecting pipe 6 is set as a three-way pipe, combined with the second feed pipe 8, the first pressure gauge 9, and the second pressure gauge 10, so that the internal pressure of the pipeline of the oil-rich circulation pump 5 and the pressure at the connecting pipe 6 can be compared, so that the pressure difference on both sides of the connecting valve 7 will not be too large, thereby reducing the loss of the connecting valve 7 and making the operation of the device more stable.

[0024] The corrosion-resistant coating on the inner wall of the pipeline of the oil-rich circulation pump 5 is formed by spraying ceramic particles, and the pipeline of the oil-rich circulation pump 5 is a carbon steel pipe, so that the pipeline of the oil-rich circulation pump 5 is not easy to break during the circulation of the liquid.

[0025] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A rich oil circulation device for a benzene washing tower, comprising a benzene washing tower body (1), characterized in that: The top of the benzene washing tower body (1) is connected to a first feed pipe (2), the bottom of the benzene washing tower body (1) is connected to a discharge pipe (3), one end of the discharge pipe (3) is connected to an oil-water separator (4), the top of the oil-water separator (4) is provided with an oil-rich circulation pump (5), one end of one of the pipelines of the oil-rich circulation pump (5) extends to the oil area of ​​the oil-water separator (4), one end of the first feed pipe (2) is provided with a connecting pipe (6), one end of the other pipeline of the oil-rich circulation pump (5) is connected to a pipeline of the connecting pipe (6), and a connecting valve (7) is installed on the other pipeline of the oil-rich circulation pump (5).

2. The oil-rich circulation device of the benzene washing tower according to claim 1, characterized in that: The connecting pipe (6) is configured as a three-way pipe, one end of the connecting pipe (6) is connected to a second feed pipe (8), and a first pressure gauge (9) is installed on the connecting pipe (6).

3. The oil-rich circulation device of the benzene washing tower according to claim 1 is characterized in that, A second pressure gauge (10) is installed on the pipeline of the oil-rich circulation pump (5) at the bottom of the connecting valve (7).

4. The oil-rich circulation device of the benzene washing tower according to claim 1 is characterized in that, The interior of the pipeline of the oil-rich circulation pump (5) is provided with a corrosion-resistant coating.

5. The oil-rich circulation device of the benzene washing tower according to claim 1 is characterized in that: The communication valve (7) is configured as a one-way valve.

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