CN219119451U

CN219119451U - Matched solvent recovery device of vacuum system

Info

Publication number: CN219119451U
Application number: CN202122034900.6U
Authority: CN
Inventors: 赵金召; 黄德伟; 郑敏捷; 周磊
Original assignee: Wuyang Weisen Biomedical Co ltd
Current assignee: Wuyang Weisen Biomedical Co ltd
Priority date: 2021-08-26
Filing date: 2021-08-26
Publication date: 2023-06-02
Anticipated expiration: 2031-08-26

Abstract

The utility model discloses a solvent recovery device matched with a vacuum system, which relates to the technical field of solvent recovery devices and solves the technical problems that the existing tail gas recovery system cannot recycle solvents and reduce tail gas treatment capacity, and comprises at least two front condensation recovery devices and vacuum pumps respectively connected with the front condensation recovery devices, wherein the outlets of the vacuum pumps are connected with the rear condensation recovery devices; the matched solvent recovery device of the vacuum system provided by the utility model can recover a large amount of available solvents, reduce solvent loss, simultaneously reduce the amount of solvents which go to the VOCs tail gas treatment system, improve the working efficiency of the tail gas treatment system, and really play roles in energy conservation and emission reduction.

Description

Matched solvent recovery device of vacuum system

Technical Field

The utility model relates to the technical field of solvent recovery devices, in particular to the technical field of solvent recovery devices matched with vacuum systems.

Background

The tail gas in the reaction kettle/collection tank pumped and discharged by the existing dry vacuum pump unit cannot be effectively collected, so that the equipment facilities in the production area and the surrounding environment are greatly influenced, and the environmental protection policy of energy conservation and emission reduction is not met.

For example, patent application document 201721734348.9 discloses an MMA tail gas recovery system, wherein an air outlet at the top of a waste acid storage tank is connected with a tail gas condenser through a pipeline, a tail gas buffer tank is connected to the tail gas condenser, and a condensate outlet connected with the waste acid storage tank is arranged at the lower part of the tail gas condenser; the tail gas outlets of the acylation section reactor I and the acylation section reactor II are respectively connected with the tail gas buffer tank through tail gas conveying pipelines, an exhaust port is formed in the tail gas buffer tank, an exhaust pipeline connected with the incinerator is arranged on the exhaust port, a vacuum pump is arranged on the exhaust pipeline, and a pneumatic diaphragm pump connected with a waste acid storage tank is connected to a liquid phase outlet of the tail gas buffer tank. According to the utility model, by adding the tail gas condenser and the tail gas buffer tank, part of tail gas discharged from the waste acid storage tank is condensed and then sent back to the waste acid storage tank, so that gas phase liquid is reduced, and the load of a vacuum pump is reduced; the uncondensed tail gas and the tail gas from the acylation section reactor I are mixed in a tail gas buffer tank to be boosted and then sent into an incinerator for treatment, so that pollution is reduced.

It can be seen that the liquid phase collected by the tail gas recovery system is directly discharged into the waste acid storage tank without being recycled, and meanwhile, the gas phase discharged from the exhaust port is directly discharged into the incinerator for combustion, and the actual gas phase still contains a lot of liquid, so that the combustion load is greatly increased.

Disclosure of Invention

The utility model aims at: in order to solve the technical problems, the utility model provides a solvent recovery device matched with a vacuum system.

The utility model adopts the following technical scheme for realizing the purposes:

a solvent recovery device matched with a vacuum system. The solvent recovery device includes:

the front condensation recovery device comprises at least two front tail gas condensers, the inlets of the front tail gas condensers are connected with the outlets of the collecting tanks, the outlets of the front tail gas condensers are connected with the inlets of the front separators, and the liquid phase outlets of the front separators are connected with the inlets of the front solvent recovery tanks;

the inlets of the vacuum pumps are connected with the gas phase outlet of the front separator through a first pipeline;

the rear condensation recovery device comprises a rear tail gas condenser, an inlet of the rear tail gas condenser is connected with at least two outlets of the vacuum pump through a second pipeline, an outlet of the rear tail gas condenser is connected with an inlet of the rear separator, a liquid phase outlet of the rear separator is connected with an inlet of the rear solvent recovery tank, and a gas phase outlet of the rear separator is connected with an emptying pipeline.

Further, a first cut-off valve, a filter and a vacuum gauge are sequentially arranged on the first pipeline.

Further, the pressure balance port of the front solvent recovery tank is communicated with the first pipeline through a third pipeline, and a second cut-off valve is arranged on the third pipeline.

Further, the vacuum pump adopts a spiral dry vacuum pump.

Further, a muffler is provided between the vacuum pump and the rear exhaust condenser.

Further, the muffler is connected to the rear solvent recovery tank through a fourth pipe.

The beneficial effects of the utility model are as follows:

the matched solvent recovery device of the vacuum system provided by the utility model can recover a large amount of available solvents, so that the solvent loss is reduced; meanwhile, the solvent amount of the VOCs tail gas treatment system is reduced, the working efficiency of the tail gas treatment system is improved, and the effects of energy conservation and emission reduction are truly achieved.

Drawings

FIG. 1 is a schematic diagram of the structure of a solvent recovery device associated with a vacuum system of the present utility model;

reference numerals: 1-a front tail gas condenser; 2-front separator; 3-a front solvent recovery tank; 4-a vacuum pump; 5-a first pipe; 6-a rear tail gas condenser; 7-a second pipe; 8-a post separator; 9-a post solvent recovery tank; 10-a first shut-off valve; 11-a filter; 12-vacuum gauge; 13-a third pipe; 14-a second shut-off valve; 15-a muffler; 16-fourth pipe.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present utility model more apparent, the technical solutions of the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model, and it is apparent that the described embodiments are some embodiments of the present utility model, but not all embodiments of the present utility model. The components of the embodiments of the present utility model generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the utility model, as presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Example 1

As shown in fig. 1, this embodiment provides a solvent recovery device for a vacuum system. The solvent recovery device comprises: the front condensation recovery device comprises at least two front tail gas condensers 1, the inlet of each front tail gas condenser 1 is connected with the outlet of the corresponding collecting tank, the outlet of each front tail gas condenser 1 is connected with the inlet of the corresponding front separator 2, and the liquid phase outlet of the corresponding front separator 2 is connected with the inlet of the corresponding front solvent recovery tank 3; the vacuum pumps 4 are at least two, and inlets of the vacuum pumps 4 are connected with a gas phase outlet of the front separator 2 through a first pipeline 5; the rear condensation recovery device comprises a rear tail gas condenser 6, an inlet of the rear tail gas condenser 6 is connected with outlets of at least two vacuum pumps 4 through a second pipeline 7, an outlet of the rear tail gas condenser 6 is connected with an inlet of a rear separator 8, a liquid phase outlet of the rear separator 8 is connected with an inlet of a rear solvent recovery tank 9, and a gas phase outlet of the rear separator 8 is connected with an emptying pipeline.

By adopting the technical scheme, tail gas exhausted by different workshop vacuum systems (reaction kettles or collecting tanks) is respectively recovered by a front condensation recovery device, a large amount of solvent is recovered, and the solvent has simple components and can be recycled. The vacuum pump 4 corresponds to the front condensation recovery device one by one, the tail gas passes through the vacuum pump 4 unit, the tail gas is connected into the rear condensation recovery device after being combined with the pipeline to collect and obtain a mixed solvent, and the mixed solvent is treated according to the waste solvent due to various components. The tail gas after being treated by the post-condensation recovery device enters the VOCs tail gas treatment system for treatment through the evacuation pipeline, so that the solvent amount of the tail gas to the VOCs tail gas treatment system is reduced, and the working efficiency of the tail gas treatment system is improved.

Further, as shown in fig. 1, a first shut-off valve 10, a filter 11, and a vacuum gauge 12, which are sequentially connected, are provided between the front separator 2 and the vacuum pump 4. The first cut-off valve 10 is convenient for controlling each path of front condensation recovery device independently, when a certain workshop stops production, the corresponding first cut-off valve 10 is cut off, the corresponding front condensation recovery device and the vacuum pump 4 are closed, and no-load operation of equipment is avoided. The filter 11 can remove larger solid impurities in the fluid, so that machine equipment and instruments can work and operate normally, the stable process is achieved, and the safe production is ensured. The vacuum gauge 12 facilitates measurement of vacuum or air pressure.

Further, the pressure balance port of the front solvent recovery tank 3 communicates with the first pipe 5 through a third pipe 13, and a second shut-off valve 14 is provided on the third pipe 13. The third pipeline 13 is used for balancing the pressure in the front solvent recovery tank 3, and the second cut-off valve 14 is in a closed state when the vacuum system operates; the second cut-off valve 14 is opened during discharging, so that the situation that micro vacuum is formed in the front solvent recovery tank 3 in the discharging process of materials, and discharging is not smooth is avoided.

Further, the vacuum pump 4 in the present embodiment adopts a screw dry vacuum pump.

Further, in view of reducing noise pollution generated by the vacuum pump 4 unit, a muffler 15 is provided between the vacuum pump 4 and the rear exhaust condenser 6.

Still further, the muffler 15 is connected to the post-solvent recovery tank 9 through a fourth pipe 16. Because the muffler 15 is arranged at the rear end of the vacuum pump 4, no vacuum exists, cooling liquid remains in the muffler, and the fourth pipeline 16 solves the problem of residual solvent in the muffler 15.

It will be appreciated that in this embodiment, the vacuum pump 4 is purged with nitrogen for protection. The front solvent recovery tank 3 and the rear solvent recovery tank 9 may be cooled by circulating water.

Example 2

The use of the solvent recovery device associated with the vacuum system in example 1 reduces the amount of solvent going to the VOCs tail gas treatment system and improves the working efficiency of the tail gas treatment system. The specific analysis is as follows:

the recovery rate of the solvent in the collecting tank in the workshop is about 85 percent (the recovery rates of different solvents are slightly different), the front solvent recovery tank 3 which is additionally arranged can recover 85 percent of uncollected solvent, and the rear solvent recovery tank 9 can recover 90 percent of the residual solvent.

And (3) calculating:

workshop collection rate: 85% (recyclable)

Solvent collection rate before vacuum pump: (1-85%) x 85% = 12.75% (recyclable sleeve)

Solvent collection rate after vacuum pump: (1-85% -12.75%) ×90% =2.025% (mixture, discard)

The amount of the tail gas entering the VOCs treatment system is as follows: 1-85% -12.75% -2.025% = 0.225%.

Claims

1. A vacuum system-associated solvent recovery apparatus, comprising:

2. The apparatus of claim 1, wherein the first pipe is provided with a first shut-off valve, a filter, and a vacuum gauge in sequence.

3. The vacuum system-associated solvent recovery apparatus of claim 1, wherein the pressure equalizing port of the front solvent recovery tank is in communication with the first conduit via a third conduit, and wherein a second shut-off valve is disposed on the third conduit.

4. The apparatus of claim 1, wherein the vacuum pump is a screw dry vacuum pump.

5. The vacuum system-associated solvent recovery apparatus of claim 1, wherein a muffler is disposed between the vacuum pump and the rear exhaust condenser.

6. The apparatus of claim 5, wherein the muffler is connected to the post-solvent recovery tank via a fourth conduit.