Distillation decompression device of crude benzol tower

Abstract

The utility model provides a crude benzene tower distillation decompression device which comprises a distillation tower, the top of the distillation tower is connected with an exhaust pipe, the exhaust pipe is connected with a crude benzene cooler, the crude benzene cooler is connected with a liquid conveying pipe, a buffer tank is arranged above a decompression pipe, the middle part of the liquid conveying pipe is connected with a decompression pipe, and the decompression pipe is connected with the crude benzene cooler. The end, away from the liquid conveying pipe, of the pressure reducing pipe is connected with the side wall of the buffer tank, and the top of the buffer tank is connected with a gas conveying pipe. The pressure reducing pipe is connected to the liquid conveying pipe for conveying distilled crude benzene, and part of liquid and gas in the liquid conveying pipe are conveyed into the buffer tank through the pressure reducing pipe, so that the pressure intensity in the liquid conveying pipe and a subsequent pipeline is effectively reduced, and the pipeline leakage is prevented; part of condensed gas can be condensed and recovered through the buffer tank, so that the recovery rate of crude benzene is effectively improved, and resources are saved; the structure is simple and the use mode is convenient.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the technical field of chemical equipment relates to a crude benzol tower distillation decompression device. BACKGROUND

[0002] Crude benzol produced in the coking process of coking coal is an important raw material for organic chemical industry, and recovering crude benzol has high economic benefits. Under normal circumstances, the content of crude benzol in coke oven gas is generally 25-40g / m³, and the yield is 0.9%-1.1% of dry coal. Most of the early domestic coking enterprises adopt the atmospheric distillation process of pipe furnace heating rich oil and superheated steam stripping benzene, which belongs to the conventional crude benzol recovery process, and the yield is basically between 0.8%-0.9%, which has the disadvantages of low crude benzol recovery rate, large steam consumption and much waste water.

[0003] During the distillation of the crude benzol tower, the pressure is 8-9kPa, which causes the subsequent equipment and process pipelines to have a risk of leakage, and in addition, it also affects the mass transfer rate of benzene components in the crude benzol tower under decompression, resulting in low crude benzol recovery rate, large steam consumption and much waste water. UTILITY MODEL CONTENT

[0004] The utility model is directed at the problem of high pressure after the distillation of the crude benzol tower in the background art, and provides a crude benzol tower distillation decompression device.

[0005] To this end, the utility model takes the following technical scheme:

[0006] A crude benzol tower distillation decompression device, comprising a distillation tower, an exhaust pipe connected to the top of the distillation tower, a crude benzol cooler connected to the exhaust pipe, a liquid delivery pipe connected to the crude benzol cooler, a buffer tank provided above the liquid delivery pipe, a decompression pipe connected to the middle part of the liquid delivery pipe, the end of the decompression pipe away from the liquid delivery pipe connected to the side wall of the buffer tank, and a gas delivery pipe connected to the top of the buffer tank.

[0007] Further, a decompression regulating valve is provided on the decompression pipe.

[0008] Further, a gas delivery valve is provided on the gas delivery pipe.

[0009] Further, a liquid return pipe is connected to the bottom of the buffer tank, and the liquid return pipe is connected to the middle part of the liquid delivery pipe.

[0010] Further, a liquid return valve is provided on the liquid return pipe.

[0011] Further, a plurality of fins are provided on the decompression pipe, and a fan is provided on one side of the decompression pipe.

[0012] The beneficial effects of this utility model are as follows: By connecting a pressure reducing pipe to the delivery pipe for distilling crude benzene, a portion of the liquid and gas in the delivery pipe is transported to the buffer tank through the pressure reducing pipe, effectively reducing the pressure in the delivery pipe and subsequent pipelines and preventing pipeline leakage; the buffer tank can condense and recover a portion of the gas, effectively improving the crude benzene recovery rate and saving resources; the structure is simple and the method of use is convenient. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model;

[0014] In the diagram, 1-distillation tower, 2-exhaust pipe, 3-crude benzene cooler, 4-liquid delivery pipe, 5-buffer tank, 6-pressure reducing pipe, 7-pressure reducing regulating valve, 8-fins, 9-fan, 10-gas delivery pipe, 11-gas delivery valve, 12-return pipe, 13-return valve. Detailed Implementation

[0015] The present invention will now be described in detail with reference to the accompanying drawings:

[0016] like Figure 1 As shown, a crude benzene distillation and depressurization device includes a distillation column 1 for distilling crude benzene. The top of the distillation column 1 is connected to an exhaust pipe 2, through which the gas produced after distillation is discharged. The exhaust pipe 2 is connected to a crude benzene cooler 3, which is a conventional cooler used to condense the distilled crude benzene into liquid. The crude benzene cooler 3 is connected to a liquid delivery pipe 4, through which the condensed liquid is transported to subsequent equipment. A buffer tank 5 is located above the liquid delivery pipe 4, and a depressurization pipe 6 is connected to the middle of the liquid delivery pipe 4. The end of the depressurization pipe 6 away from the liquid delivery pipe 4 is connected to the side wall of the buffer tank 5. When the liquid is transported in the liquid delivery pipe 4, the gas and part of the liquid in the liquid can pass through the depressurization pipe 6. The gas is delivered to the buffer tank 5, thereby reducing the pressure in the delivery pipe 4. The pressure reducing pipe 6 is equipped with a pressure reducing regulating valve 7, which can control the flow rate of gas and liquid entering the pressure reducing pipe 6. The pressure reducing pipe 6 is equipped with multiple fins 8, and a fan 9 is provided on one side of the pressure reducing pipe 6. The fan 9 can blow air to the fins 8 for heat exchange. The heat exchange and cooling of the fins 8 can condense some of the uncondensed gas in the pressure reducing pipe 6 into liquid, preventing waste. The top of the buffer tank 5 is connected to a gas delivery pipe 10, through which the non-condensable gas in the buffer tank 5 can be discharged. The gas delivery pipe 10 is equipped with a gas delivery valve 11. The bottom of the buffer tank 5 is connected to a return liquid pipe 12, which is connected to the middle of the delivery pipe 4. The return liquid pipe 12 is equipped with a return liquid valve 13.

[0017] The method of using this utility model is as follows:

[0018] After crude benzene is distilled in distillation tower 1, it is fed into crude benzene cooler 3 through exhaust pipe 2 for cooling, condensing some of the gas into liquid. The condensed liquid and gas are then transported through liquid delivery pipe 4. When passing through pressure reducing pipe 6, some of the liquid and gas in liquid delivery pipe 4 can be transported to buffer tank 5 through pressure reducing pipe 6, thereby reducing the pressure in liquid delivery pipe 4. During the transport through pressure reducing pipe 6, heat exchange occurs through fins 8 on pressure reducing pipe 6, and the cooling can condense some of the uncondensed gas in pressure reducing pipe 6 into liquid, preventing waste. When the gas enters buffer tank 5, it can be discharged through gas delivery pipe 10 at the top of buffer tank 5. The liquid stored in buffer tank 5 can be returned to liquid delivery pipe 4 through return pipe 12 after opening return valve 13.

[0019] By using this device to reduce the pressure in infusion line 4, leakage in subsequent pipelines due to excessive pressure can be effectively prevented, and the crude benzene recovery rate can be effectively improved.

Claims

1. A crude benzene distillation vacuum apparatus, characterized in that, The system includes a distillation column (1), the top of which is connected to an exhaust pipe (2), the exhaust pipe (2) is connected to a crude benzene cooler (3), the crude benzene cooler (3) is connected to a liquid delivery pipe (4), a buffer tank (5) is provided above the liquid delivery pipe (4), a pressure reducing pipe (6) is connected to the middle of the liquid delivery pipe (4), the end of the pressure reducing pipe (6) away from the liquid delivery pipe (4) is connected to the side wall of the buffer tank (5), and a gas delivery pipe (10) is connected to the top of the buffer tank (5).

2. The crude benzene distillation vacuum apparatus according to claim 1, characterized in that, The pressure reducing pipe (6) is equipped with a pressure reducing regulating valve (7).

3. The crude benzene distillation vacuum apparatus according to claim 1, characterized in that, The gas supply pipe (10) is equipped with a gas supply valve (11).

4. The crude benzene distillation vacuum apparatus according to claim 1, characterized in that, The bottom of the buffer tank (5) is connected to a return pipe (12), which is connected to the middle of the infusion pipe (4).

5. The crude benzene distillation vacuum apparatus according to claim 4, characterized in that, The return pipe (12) is equipped with a return valve (13).

6. The crude benzene distillation vacuum apparatus according to claim 1, characterized in that, The pressure reducing pipe (6) is provided with multiple fins (8), and a fan (9) is provided on one side of the pressure reducing pipe (6).

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