CN211725234U - Rectifying column tail gas purification system - Google Patents

Abstract

The utility model discloses a rectification tower tail gas purification system, which comprises a rectification tower, a primary condenser, a secondary condenser and a distillate storage tank. The rectification tower is connected with the primary condenser through a primary tail gas conveying pipe The primary condenser is communicated with the secondary condenser through the secondary tail gas feeding pipe, and the distillate storage tank is communicated with the secondary condenser through the purified gas feeding pipe; One end of the pipe is connected with the secondary tail gas feeding pipe, and the other end is connected with the upper end of the rectification tower, and a U-shaped pipe is arranged on the reflux pipe; The separated dichloromethane is separated, which avoids the pollution to the environment by the tail gas; the recycling of the separated dichloromethane is realized through the setting of the return pipe and the U-shaped pipe, which saves resources and reduces the production cost; the structure of the utility model is Simple, easy to operate, worthy of promotion.

Description

A rectification tower tail gas purification system

technical field

The utility model relates to the technical field of chemical production equipment, in particular to a rectifying tower tail gas purification system.

Background technique

In chemical production, dichloromethane is widely used as the reaction medium and solvent, and then the product and the dichloromethane solvent are separated through a rectifying tower. In this process, a large amount of tail gas containing dichloromethane solvent will inevitably be generated. If the exhaust gas is discharged, it will not only pollute the environment but also waste production raw materials and increase production costs. Therefore, it is very necessary to produce a rectifying tower tail gas purification system in the technical field of chemical production equipment.

Utility model content

The purpose of this utility model is to provide a rectifying tower tail gas purification system to solve the problems raised in the above background technology.

In order to achieve the above purpose, the utility model provides the following technical scheme: a rectifying tower tail gas purification system, wherein, comprising a rectifying tower 1, a primary condenser 2, a secondary condenser 3 and a distillate storage tank 4, so The upper part of the rectifying tower 1 is connected with a first-level tail gas conveying pipe 10, and the rectifying tower 1 is communicated with the first-level condenser 2 through the first-level tail gas conveying pipe 10, and the upper end of the first-level condenser 2 is connected with a The secondary tail gas feeding pipe 11, the primary condenser 2 is communicated with the secondary condenser 3 through the secondary tail gas feeding pipe 11, and the outlet of the secondary condenser 3 is connected with a purified gas delivery pipe 12, The distillate storage tank 4 is communicated with the secondary condenser 3 through the purified gas delivery pipe 12;

The secondary tail gas feeding pipe 11 is connected with a reflux pipe 13, one end of the reflux pipe 13 is communicated with the secondary tail gas feeding pipe 11, and the other end is connected with the upper end of the rectifying tower 1. A section of U-shaped pipe 14 is provided on the pipe 13 .

Preferably, a condensed water outlet 5 is provided on one side of the upper end of the primary condenser 2 , and a condensed water inlet 6 is provided on the other side of the lower end of the primary condenser 2 . Both are provided with ball valves 16 .

Preferably, a chilled water outlet 7 is provided on one side of the upper end of the secondary condenser 3 , and a chilled water inlet 8 is provided on the other side of the lower end of the secondary condenser 3 . Both are provided with ball valves 16 .

Preferably, the distillate storage tank 4 is provided with a discharge pipe 9, the lowest point of the U-shaped pipe 14 is provided with a vent pipe 15, the discharge pipe 9, the purified gas delivery pipe 12 and the vent pipe 15 are provided with ball valves 16 .

Preferably, the temperature of the condensed water introduced into the condensed water inlet 6 is lower than 20°C.

Preferably, the temperature of the chilled water introduced into the chilled water inlet 8 is lower than 10°C.

Preferably, the primary condenser 2 is a tubular condenser, the secondary condenser 3 is a spiral tube condenser, the shell of the secondary condenser 3 is made of 304 stainless steel, and the secondary condenser 3 is made of 304 stainless steel. 3. The spiral tube is 316L stainless steel tube.

Beneficial effect: Compared with the prior art, the beneficial effect of the present utility model is: through the setting of the primary condenser and the secondary condenser, the methylene chloride contained in the tail gas can be separated, and the pollution of the environment by the tail gas can be avoided. ; Through the setting of the return pipe and the U-shaped pipe, the recovery and utilization of the separated dichloromethane is realized, the resources are saved, and the production cost is reduced.

Description of drawings

1 is a schematic diagram of the overall structure of a rectification tower tail gas purification system proposed by the utility model.

In the accompanying drawings: 1-rectification tower, 2-first-stage condenser, 3-secondary condenser, 4-distillate storage tank, 5-condensed water outlet, 6-condensed water inlet, 7-chilled water outlet, 8- Chilled water inlet, 9- Discharge pipe, 10- Primary exhaust gas delivery pipe, 11- Secondary exhaust gas feeding pipe, 12- Purified gas delivery pipe, 13- Return pipe, 14- U-shaped pipe, 15- Vent tube, 16-ball valve.

Detailed ways

The technical solution of the present patent will be described in further detail below in conjunction with specific embodiments.

Example

Please refer to FIG. 1, in the embodiment of the present utility model, a rectification tower tail gas purification system includes a rectification tower 1, a primary condenser 2, a secondary condenser 3 and a distillate storage tank 4, a rectification tower 1 The upper part is connected with a first-level tail gas delivery pipe 10, the rectification tower 1 is communicated with the first-level condenser 2 through the first-level tail gas delivery pipe 10, and the upper end of the first-level condenser 2 is connected with a second-level tail gas feeding pipe 11, and the first-level condenser 2 passes through The secondary tail gas feeding pipe 11 is communicated with the secondary condenser 3, the outlet of the secondary condenser 3 is connected with a purified gas delivery pipe 12, and the distillate storage tank 4 is communicated with the secondary condenser 3 through the purified gas delivery pipe 12;

The secondary tail gas feeding pipe 11 is connected with a reflux pipe 13, one end of the reflux pipe 13 is communicated with the secondary tail gas feeding pipe 11, and the other end is connected with the upper end of the rectifying tower 1, and a section of U-shaped pipe 14 is arranged on the reflux pipe 13 , the U-shaped pipe 14 can prevent the gas of the rectification tower 1 from directly entering the secondary condenser 3 through the reflux pipe 13 according to the principle of the communication device.

Further, one side of the upper end of the primary condenser 2 is provided with a condensed water outlet 5, the other side of the lower end of the primary condenser 2 is provided with a condensed water inlet 6, and both the condensed water outlet 5 and the condensed water inlet 6 are provided with a ball valve 16. .

Further, a chilled water outlet 7 is provided on one side of the upper end of the secondary condenser 3, a chilled water inlet 8 is provided on the other side of the lower end of the secondary condenser 3, and a ball valve 16 is provided on both the chilled water outlet 7 and the chilled water inlet 8. .

Further, the distillate storage tank 4 is provided with a discharging pipe 9, the lowest point of the U-shaped pipe 14 is provided with a venting pipe 15, and the discharging pipe 9, the purified gas conveying pipe 12 and the venting pipe 15 are all provided with Ball valve 16.

Further, the temperature of the condensed water introduced into the condensed water inlet 6 is lower than 20°C.

Further, the temperature of the chilled water introduced into the chilled water inlet 8 is lower than 10°C.

Further, the primary condenser 2 is a tubular condenser, the secondary condenser 3 is a spiral tube condenser, the shell of the secondary condenser 3 is made of 304 stainless steel, and the spiral tube in the secondary condenser 3 is 316L stainless steel. Tube.

Use process:

When in use, the tail gas produced by the rectifying tower 1 passes through the condensation of the primary condenser 2 and the secondary condenser 3, separates methylene chloride from the tail gas, and returns to the rectification through the reflux pipe 13 and the U-shaped pipe 14. In the tower 1, the pollution of the environment by the exhaust gas is avoided, resources are saved, and the production cost is reduced. The U-shaped pipe 14 can prevent the gas of the rectification tower 1 from directly entering the secondary condenser 3 through the reflux pipe 13 according to the principle of the communicating device.

In the above process, the dichloromethane contained in the tail gas can be separated by the setting of the primary condenser and the secondary condenser, so as to avoid the pollution of the tail gas to the environment; by the setting of the return pipe and the U-shaped pipe, the separation is realized. The recovery and utilization of the obtained dichloromethane saves resources and reduces production costs; the application has simple structure, strong practicability, and simple operation, which is worthy of popularization.

The above are only the preferred embodiments of the present utility model. It should be pointed out that for those skilled in the art, some modifications and improvements can be made without departing from the concept of the present utility model. These should also be regarded as the present utility model. The scope of protection of the new model will not affect the effect of the implementation of the present utility model and the practicability of the patent.

Claims (7)

1. The utility model provides a rectifying column tail gas clean-up system which characterized in that: the distillation tower comprises a distillation tower (1), a primary condenser (2), a secondary condenser (3) and a distillate storage tank (4), wherein a primary tail gas conveying pipe (10) is connected to the upper part of the distillation tower (1), the distillation tower (1) is communicated with the primary condenser (2) through the primary tail gas conveying pipe (10), a secondary tail gas conveying pipe (11) is connected to the upper end of the primary condenser (2), the primary condenser (2) is communicated with the secondary condenser (3) through the secondary tail gas conveying pipe (11), a purified gas conveying pipe (12) is connected to the outlet of the secondary condenser (3), and the distillate storage tank (4) is communicated with the secondary condenser (3) through the purified gas conveying pipe (12);

a return pipe (13) is connected to the secondary tail gas feeding pipe (11), one end of the return pipe (13) is communicated with the secondary tail gas feeding pipe (11), the other end of the return pipe is connected with the upper end of the rectifying tower (1), and a section of U-shaped pipe (14) is arranged on the return pipe (13).

2. The rectification column tail gas purification system according to claim 1, wherein: one side of the upper end of the primary condenser (2) is provided with a condensed water outlet (5), the other side of the lower end of the primary condenser (2) is provided with a condensed water inlet (6), and ball valves (16) are arranged on the condensed water outlet (5) and the condensed water inlet (6).

3. The rectification column tail gas purification system according to claim 1, wherein: one side of the upper end of the secondary condenser (3) is provided with a chilled water outlet (7), the other side of the lower end of the secondary condenser (3) is provided with a chilled water inlet (8), and ball valves (16) are arranged on the chilled water outlet (7) and the chilled water inlet (8).

4. The rectification column tail gas purification system according to claim 1, wherein: be provided with discharging pipe (9) on distillate storage tank (4), U-shaped pipe (14) the minimum is provided with blow-down pipe (15), all be provided with ball valve (16) on discharging pipe (9), purified gas conveyer pipe (12) and blow-down pipe (15).

5. The rectification column tail gas purification system according to claim 2, wherein: the temperature of the condensed water introduced from the condensed water inlet (6) is lower than 20 ℃.

6. The rectification column tail gas purification system according to claim 3, wherein: the temperature of the freezing water introduced from the freezing water inlet (8) is lower than 10 ℃.

7. The rectification column tail gas purification system according to claim 1, wherein: the condenser is characterized in that the first-stage condenser (2) is a shell-and-tube condenser, the second-stage condenser (3) is a spiral tube condenser, the shell of the second-stage condenser (3) is made of 304 stainless steel materials, and the spiral tube in the second-stage condenser (3) is a 316L stainless steel tube.

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