CN211936260U - Tetrahydrofuran tail gas safety recovery device - Google Patents

Abstract

The utility model relates to chemical industry tail gas recovery plant field, concretely relates to tetrahydrofuran tail gas safety recovery unit. Including the collecting tank, be fixed with on the collecting tank and advance the pipe with the tail gas of cavity intercommunication down, tail gas advances to be provided with cooling device on the pipe, be provided with the second intake pipe of the type of falling U in the cavity down, be provided with the first intake pipe of the type of falling U in the epicoele, first intake pipe one end is run through the baffle and is extended to in the cavity down, the collecting tank upper end is fixed with the outlet duct rather than inside intercommunication, collecting tank one side is provided with the collection box, first drain pipe and second drain pipe pass through the three-way pipe intercommunication with the collection box, install the water pump on the branch pipe of the three-way pipe of collection box intercommunication, communicating pipe one end extends to in the collecting tank and. The utility model discloses, can carry out recycle after water-soluble to the tetrahydrofuran in the tail gas that contains tetrahydrofuran, effectively reduce the material consumption, improve the safety guarantee of apparatus for producing and plant personnel's equipment simultaneously, the tetrahydrofuran clearance is high.

Description

Tetrahydrofuran tail gas safety recovery device

Technical Field

The utility model relates to chemical industry tail gas recovery plant field, concretely relates to tetrahydrofuran tail gas safety recovery unit.

Background

During the production of polybutylene terephthalate, Tetrahydrofuran (THF) and water are formed by the reaction. Tetrahydrofuran is a volatile liquid, and vapor of tetrahydrofuran is in contact with air to form an explosive mixture, and the explosive mixture is easy to burn when meeting open fire, high heat and strong oxidant, and can generate peroxide with potential explosion danger when contacting air or under the condition of illumination. In order to prevent uncondensed steam containing THF from gathering in the equipment and producing explosion, waste gas collecting pipelines are arranged at the top of each condenser and the top of the container, and finally, the waste gas is subjected to torch combustion. Thus, tetrahydrofuran in the exhaust gas cannot be collected and utilized well.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that one kind can carry out recycle, high safe tetrahydrofuran tail gas safety recovery device to the tetrahydrofuran in the tail gas that contains tetrahydrofuran.

In order to realize the purpose, the utility model provides a technical scheme is:

the tetrahydrofuran tail gas safe recovery device comprises a collecting tank, a baffle is fixed in the collecting tank, the baffle divides the collecting tank into two independent upper cavity and lower cavity, water is stored in the upper cavity and the lower cavity, a first water adding pipe and a second water adding pipe which are respectively communicated with the upper cavity and the lower cavity are fixed on the left side of the collecting tank, a tail gas inlet pipe communicated with the lower cavity is fixed on the collecting tank, a cooling device is arranged on the tail gas inlet pipe, an inverted U-shaped second gas inlet pipe is arranged in the lower cavity, the straight part at the upper end of the second gas inlet pipe is positioned above the water surface in the lower cavity, one end of the second gas inlet pipe is communicated with the tail gas inlet pipe, the other end of the second gas inlet pipe extends into the water in the lower cavity, an inverted U-shaped first gas inlet pipe is arranged in the upper cavity, the straight part at the upper end of the first gas inlet pipe is positioned above the water surface in the upper, the first intake pipe other end extends to the aquatic in the intracavity, the collecting tank upper end is fixed with the outlet duct rather than inside intercommunication, be fixed with respectively on the collecting tank with first drain pipe and the second drain pipe of last cavity and cavity intercommunication down, collecting tank one side is provided with the collection box, first drain pipe and second drain pipe pass through the three-way pipe intercommunication with the collection box, install the water pump on the branch pipe of the three-way pipe with the collection box intercommunication, the collection box upper end is fixed with communicating pipe and blow-down pipe, communicating pipe one end extends to in the collecting tank with last cavity intercommunication, communicating pipe one end that is located the epicoele extends to the aquatic in the intracavity.

Specifically, the first water adding pipe, the second water adding pipe, the first liquid outlet pipe, the second liquid outlet pipe, the communicating pipe, the emptying pipe and the discharging pipe are all provided with valves.

Specifically, cooling device includes the cooler bin, and tail gas advances the pipe and runs through the cold case of getting, and the tail gas advances the pipe part in the cooler bin and arranges at its inside snakelike, has put water in the cooler bin, and the cooling tower passes through the pipeline intercommunication with the cooler bin.

Specifically, a flame arrester is installed on the air outlet pipe.

Specifically, a check valve is installed on the first air inlet pipe.

Compared with the prior art, the beneficial effects of the utility model are that:

the utility model discloses, simple structure, convenient operation can carry out recycle after water-soluble to the tetrahydrofuran in the tail gas that contains tetrahydrofuran, effectively reduces the material consumption, has improved the safety guarantee of apparatus for producing and plant personnel's equipment simultaneously, and the tetrahydrofuran clearance is high.

Drawings

Fig. 1 is a schematic structural diagram of the present invention.

Detailed Description

As shown in figure 1, the tetrahydrofuran tail gas safe recovery device comprises a collecting tank 1, a clapboard 2 is fixed in the collecting tank 1, the collecting tank 1 is divided into two independent upper cavities and lower cavities by the clapboard 2, water is stored in the upper cavities and the lower cavities, a first water adding pipe 13 and a second water adding pipe 14 which are respectively communicated with the upper cavities and the lower cavities are fixed at the left side of the collecting tank 1, a tail gas inlet pipe 5 communicated with the lower cavities is fixed on the collecting tank 1, a cooling device is arranged on the tail gas inlet pipe 5, an inverted U-shaped second gas inlet pipe 4 is arranged in the lower cavities, the straight part at the upper end of the second gas inlet pipe 4 is positioned above the water surface in the lower cavities, one end of the second gas inlet pipe 4 is communicated with the tail gas inlet pipe 5, the other end of the second gas inlet pipe 4 extends into the water in the lower cavities, an inverted U-shaped first gas inlet pipe 3 is arranged in the upper cavities, the straight part at the upper end of the first gas, 3 one end of first intake pipe runs through baffle 2 and extends to in the cavity down, and the 3 other end of first intake pipe extends to the aquatic in the cavity down, installs check valve 20 on the first intake pipe 3, and collecting tank 1 upper end is fixed with the outlet duct 10 rather than inside intercommunication, install spark arrester 11 on the outlet duct 10, be fixed with first drain pipe 17 and the second drain pipe 18 with last cavity and cavity down intercommunication respectively on the collecting tank 1, and collecting tank 1 one side is provided with collection box 8, and first drain pipe 17 and second drain pipe 18 communicate through three-way pipe 15 with collection box 8, install water pump 16 on the branch pipe of three-way pipe 15 with collection box 8 intercommunication, and collection box 8 upper end is fixed with communicating pipe 9 and blow-down pipe 12, and communicating pipe 9 one end extends to in the collecting tank 1 and is gone up the cavity intercommunication, and the communicating pipe 9 one end that lies in the epicoele body extends to the aquatic in the cavity.

And valves are respectively arranged on the first water adding pipe 13, the second water adding pipe 14, the first liquid outlet pipe 17, the second liquid outlet pipe 18, the communicating pipe 9, the emptying pipe 12 and the discharge pipe 19.

The cooling device comprises a cooling box 6, a tail gas inlet pipe 5 penetrates through the cold taking box 6, the tail gas inlet pipe 5 in the cooling box 6 is arranged in a snake shape in the cooling box, water is stored in the cooling box 6, and a cooling tower 7 is communicated with the cooling box through a pipeline.

The utility model discloses during the use, it is internal that tail gas advances pipe 5 and second intake pipe 4 to enter into the cavity of resorption through tail gas, water in the cooler bin 6 can advance the tail gas in the pipe 5 with tail gas and take place the heat transfer, water in the cooler bin 6 can be circulated to the cooling tower 7, and then make hydroenergy in the cooler bin 6 can last to advance tail gas in the pipe 5 to cool down the processing, tail gas enters into the cavity of resorption internal back and is carried out the washing by the internal water of cavity of resorption, tetrahydrofuran in the tail gas dissolves in the internal aquatic of cavity of resorption, the tail gas of having got rid of tetrahydrofuran enters into the cavity of resorption internal back through first intake pipe 3 and is carried out the washing once more by the internal water of cavity of resorption, a small amount of tetrahydrofuran in the tail gas is prevented to be discharged, the tail gas of having got rid of tetrahydrofuran passes through.

When the concentration of tetrahydrofuran in the water in the lower cavity is high, the mixed liquid in the lower cavity needs to be replaced, the valves on the second liquid outlet pipe 18 and the communicating pipe 9 are opened, the water pump 16 is started, the mixed liquid in the lower cavity is pumped into the recovery tank 8 by the water pump 16, the tail gas continuously enters the lower cavity, the one-way valve 20 is installed on the first air inlet pipe 3, the mixed liquid in the lower cavity can be pumped into the recovery tank 8, the water in the upper cavity can be prevented from flowing back into the lower cavity, part of the tail gas can enter the recovery tank 8 in the process of pumping the mixed liquid in the lower cavity into the recovery tank 8, the tail gas entering the recovery tank 8 can enter the upper cavity through the communicating pipe 9 for water washing, the mixed liquid in the recovery tank 8 is pumped into the upper cavity, the valves on the second liquid outlet pipe 18 and the communicating pipe 9 are closed, the water injection pipe is communicated with the second water adding pipe 14, water is added into the lower cavity, the liquid level of the water in the lower cavity is higher than the air outlet end of the second air inlet pipe 4, in the process of adding water into the lower cavity, tail gas entering the lower cavity can enter the upper cavity through the first air inlet pipe 3 to be washed, and therefore continuous emission treatment of the tail gas is achieved when liquid in the lower cavity is replaced.

The tetrahydrofuran content of the internal aquatic of epicoele is lower, consequently, the internal liquid of epicoele is changed the interval time longer, when changing the internal liquid of epicoele, open first drain pipe 17 and communicating pipe 9 on the valve, start water pump 16, take the internal liquid of epicoele into collection box 8 in, the internal liquid of epicoele is taken into the in-process of collection box 8, it can directly discharge to enter into the internal tail gas of epicoele, then add water to the cavity of resorption after directly communicating water injection pipe and first water pipe 13, make the liquid level of the internal water of epicoele be higher than behind the end of giving vent to anger of first intake pipe 3.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention are intended to be included within the scope of the present invention.

Claims (5)

1. The tetrahydrofuran tail gas safe recovery device comprises a collecting tank (1), and is characterized in that a partition plate (2) is fixed inside the collecting tank (1), the collecting tank (1) is divided into two independent upper and lower cavities by the partition plate (2), water is stored in the upper and lower cavities, a first water adding pipe (13) and a second water adding pipe (14) which are respectively communicated with the upper and lower cavities are fixed on the left side of the collecting tank (1), a tail gas inlet pipe (5) communicated with the lower cavity is fixed on the collecting tank (1), a cooling device is arranged on the tail gas inlet pipe (5), an inverted U-shaped second gas inlet pipe (4) is arranged in the lower cavity, the straight part of the second gas inlet pipe (4) is positioned above the water surface in the upper end of the lower cavity, one end of the second gas inlet pipe (4) is communicated with the tail gas inlet pipe (5), and the other end of the second gas inlet pipe (4) extends into the water in the lower cavity, an inverted U-shaped first air inlet pipe (3) is arranged in the upper cavity, the straight part of the upper end of the first air inlet pipe (3) is positioned above the water surface in the upper cavity, one end of the first air inlet pipe (3) penetrates through the partition plate (2) and extends into the lower cavity, the other end of the first air inlet pipe (3) extends into the water in the upper cavity, an air outlet pipe (10) communicated with the interior of the collection tank (1) is fixed at the upper end of the collection tank (1), a first liquid outlet pipe (17) and a second liquid outlet pipe (18) which are respectively communicated with the upper cavity and the lower cavity are fixed on the collection tank (1), a recovery box (8) is arranged at one side of the collection tank (1), the first liquid outlet pipe (17) and the second liquid outlet pipe (18) are communicated with the recovery box (8) through a three-way pipe (15), a water pump (16) is installed on a branch pipe of the three-way pipe (15) communicated with the recovery, one end of the communicating pipe (9) extends into the collecting tank (1) to be communicated with the upper cavity, and one end of the communicating pipe (9) positioned in the upper cavity extends into the water in the upper cavity.

2. The tetrahydrofuran tail gas safety recovery device according to claim 1, wherein valves are installed on the first water adding pipe (13), the second water adding pipe (14), the first liquid outlet pipe (17), the second liquid outlet pipe (18), the communicating pipe (9), the emptying pipe (12) and the discharge pipe (19).

3. The tetrahydrofuran tail gas safety recovery device according to claim 1, wherein the cooling device comprises a cooling tank (6), the tail gas inlet pipe (5) penetrates through the cooling tank (6), the tail gas inlet pipe (5) in the cooling tank (6) is partially distributed in a snake shape in the cooling tank, water is stored in the cooling tank (6), and the cooling tower (7) is communicated with the cooling tank through a pipeline.

4. The safe tetrahydrofuran tail gas recovery device according to claim 1, wherein a flame arrester (11) is installed on the gas outlet pipe (10).

5. The tetrahydrofuran off-gas safety recovery device according to claim 1, wherein a check valve (20) is installed on the first gas inlet pipe (3).

Images