CN209828630U

CN209828630U - Dewatering device for benzoic acid waste gas

Info

Publication number: CN209828630U
Application number: CN201920568229.3U
Authority: CN
Inventors: 李仁峰
Original assignee: Jujube Guipu Material Ltd Company
Current assignee: Jujube Guipu Material Ltd Company
Priority date: 2019-04-24
Filing date: 2019-04-24
Publication date: 2019-12-24
Anticipated expiration: 2029-04-24

Abstract

The utility model discloses a dewatering device of benzoic acid waste gas, the chemistry waste gas treatment field. The dehydrating device for treating the benzoic acid and the condensed water simultaneously is provided aiming at the problems of low benzoic acid recovery rate and high water content in the prior art. Comprises a condenser pipe, a centrifugal separator, a dryer, an evaporator and a storage tank; and (4) centrifugally separating the condensed water, then respectively sending the condensed water into a dryer and an evaporator for treatment, and finally collecting and drying to obtain the dry benzoic acid. And (3) carrying out centrifugal separation on the condensate water rich in the benzoic acid, and adopting different stations to extract the benzoic acid according to different states of the separated substances. The energy consumption output of the whole device is strong in pertinence, so that the recovery rate of the benzoic acid can reach more than 95%. Is especially suitable for large-scale industrialized production environment.

Description

Dewatering device for benzoic acid waste gas

Technical Field

The utility model relates to a chemistry exhaust treatment device especially relates to a dewatering device of benzoic acid waste gas.

Background

Benzoic acid is commonly used in the manufacturing processes of dyes, livestock and poultry feeds, medical supplies and the like, and waste gas and waste water which are rich in benzoic acid are directly discharged to pollute the environment. And the benzoic acid belongs to recyclable materials, and the waste gas rich in water vapor and the benzoic acid needs to be dehydrated at present and then collected. If the waste gas is introduced into the box body with the cooling effect, the water vapor is condensed at the bottom of the box body and is discharged, and the gas flows upwards and is collected. However, the content of benzoic acid in the gas flowing up is not high, and much benzoic acid is discharged in condensed water after crystallization and precipitation along with temperature reduction. Resulting in a very low recovery rate and a gas with a high water content that cannot be used directly in other processes to follow.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the utility model aims to provide a dehydrating device for benzoic acid waste gas with high recovery rate.

Dewatering device of benzoic acid waste gas, include: a condenser pipe, a centrifugal separator, a dryer, an evaporator and a storage tank; the feed inlet of the condensing pipe is externally connected with a benzoic acid waste gas discharge port, and the discharge port of the condensing pipe is connected with the input end of a centrifugal separator; the supernatant output end of the centrifugal separator is connected with the input end of the evaporator, and the turbid material output end is connected with the first input end of the dryer; the material output end of the evaporator is connected with a second input end of the dryer; the output end of the dryer is connected with the input end of the storage tank.

A dewatering device of benzoic acid waste gas, its advantage lie in, all condense through the condenser pipe of sufficient length with all benzoic acid waste gases, then the material of output includes upper strata gas and lower floor's comdenstion water. Most of the benzoic acid was precipitated into the condensed water, and the upper gas contained almost no benzoic acid. And then carrying out centrifugal separation on the condensed water rich in the benzoic acid, and adopting different stations to extract the benzoic acid according to different states of the separated substances. The energy consumption output of the whole device is strong in pertinence, so that the recovery rate of the benzoic acid can reach more than 95%.

Preferably, the exhaust port of the dryer is connected with the exhaust port of the evaporator through a pipeline and then connected with an external collecting device. Gaseous substances at the rear end are treated uniformly, direct emission pollution is reduced, and the maximum waste gas treatment efficiency can be achieved through collected output.

Preferably, the condensation pipe is of a spiral structure, the length of the pipe is 15-19 m, and the inner diameter of the pipe is 21-30 cm; the feed inlet is positioned at the top of the spiral structure, and the discharge outlet is positioned at the bottom of the spiral structure. The spiral structure effectively prevents turbid condensate from blocking, and the condensation pipe with enough length can ensure that the benzoic acid basically falls into the condensate water. The optimal size of the condensation amount corresponding to the inner diameter size required by large-scale industry can ensure the condensation effect and also ensure that other impurities which can not be condensed have enough upper space to be discharged, so that the condensation effect for collecting benzoic acid can reach the best.

Preferably, the condensation pipe is a pipe body sleeved with an inner layer and an outer layer, and the gap between the inner pipe and the outer pipe is 5 cm-9 cm. On the basis of the length and inner diameter size ranges of the condensing pipes, the gap space for inputting condensing media directly influences the inputtable flow speed and flow, 5-9 cm is the corresponding optimal value range, and the best condensing and collecting effect can be achieved.

Drawings

FIG. 1 is a schematic structural view of a dehydration apparatus for benzoic acid waste gas according to the present invention;

fig. 2 is a partially enlarged view of a portion a in fig. 1.

Reference numerals: 10-condenser pipe, 11-feed inlet, 12-discharge outlet, 13-cold liquid inlet, 14-cold liquid outlet, 20-centrifugal separator, 31-dryer, 32-evaporator and 40-storage tank.

Detailed Description

As shown in fig. 1 and 2, the dehydration device for benzoic acid waste gas of the present invention comprises a condensation pipe 10, a centrifugal separator 20, a dryer 31, an evaporator 32 and a storage tank 40. A feed inlet 11 of the condensation pipe 10 is externally connected with a benzoic acid waste gas discharge port, and a discharge outlet 12 is connected with an input end of a centrifugal separator 20. The supernatant output end of the centrifugal separator 20 is connected with the input end of the evaporator 32, and the lower turbid material output end is connected with the first input end of the dryer 31. The material output end of the evaporator 32 is connected with a second input end of the dryer 31. The output end of the dryer 31 is connected with the input end of the storage tank 40.

The exhaust port of the dryer 31 is connected with the exhaust port of the evaporator 32 through a pipeline and then connected with an external collecting device. The condensation pipe 10 is of a spiral structure, the length of the pipe is 15-19 m, and the inner diameter of the pipe is 21-30 cm. The feed inlet 11 is located at the top of the spiral structure, and the discharge outlet 12 is located at the bottom of the spiral structure. The condensation pipe 10 is a pipe body sleeved with an inner layer and an outer layer, and the gap between the inner pipe and the outer pipe is 5 cm-9 cm. The cold liquid inlet 13 is arranged at a position close to the feed inlet 11, the cold liquid outlet 14 is arranged at a position close to the discharge outlet 12, and the cold liquid outlet 14 and the cold liquid inlet 13 are respectively communicated with the gaps between the inner pipe and the outer pipe.

A dewatering device of benzoic acid waste gas's theory of operation lie in, at first input sufficient condensing medium to cold liquid entry 13, then flow back to circulation line from cold liquid export 14. When the temperature in the condensation tube 10 is sufficiently low, benzoic acid off-gas is fed from the feed port 11, and spiral condensation is performed in the condensation tube 10 which is sufficiently long. Most benzoic acid is crystallized gradually and falls into the condensed water at the lower layer of the inner pipe, and other gases which are not condensed continue to remain at the upper layer of the inner pipe. Finally, the gas and the condensed water are discharged into a centrifugal separator 20 from a discharge port 12 for centrifugal separation, the separated supernatant and the gas firstly enter an evaporator 32, and other lower turbid materials directly enter a dryer 31. After being treated by the evaporator 32, a mixture of a small portion of benzoic acid and a small amount of impurity liquid is obtained, and then the mixture is fed into the dryer 31. The material entering the dryer 31 from the centrifugal separator 20 or entering the dryer 31 from the evaporator 32 has a high water content, and can be dried to obtain dry benzoic acid. The dried benzoic acid is sent into the storage tank 40 from the dryer 31 to be stored, the proportion of the benzoic acid obtained in the storage tank 40 is up to more than 95% relative to the benzoic acid waste gas input into the condensation pipe 10, and the recovery rate is high. All the gases generated in the dryer 31 and the evaporator 32 are intensively discharged to an external collecting device for unified treatment, and the device is green and environment-friendly.

Various other modifications and changes may be made by those skilled in the art based on the above-described technical solutions and concepts, and all such modifications and changes are intended to fall within the scope of the claims.

Claims

1. A dehydration device of benzoic acid waste gas, characterized by comprising: a condensation pipe (10), a centrifugal separator (20), a dryer (31), an evaporator (32) and a storage tank (40);

a feed port (11) of the condensation pipe (10) is externally connected with a benzoic acid waste gas discharge port, and a discharge port (12) is connected with an input end of a centrifugal separator (20); the supernatant output end of the centrifugal separator (20) is connected with the input end of the evaporator (32), and the lower turbid material output end is connected with the first input end of the dryer (31); the material output end of the evaporator (32) is connected with the second input end of the dryer (31); the output end of the dryer (31) is connected with the input end of the storage tank (40).

2. The dehydration apparatus for benzoic acid exhaust gas according to claim 1, wherein the exhaust port of the dryer (31) is connected to the exhaust port of the evaporator (32) through a pipe and then connected to an external collection device.

3. The dehydration device of benzoic acid waste gas according to claim 1, wherein said condensation tube (10) is of a spiral structure, the tube length is 15 m-19 m, and the inner diameter is 21 cm-30 cm; the feed inlet (11) is positioned at the top of the spiral structure, and the discharge outlet (12) is positioned at the bottom of the spiral structure.

4. The benzoic acid waste gas dehydration device according to claim 3, characterized in that said condensation pipe (10) is a pipe body with an inner layer and an outer layer sleeved, and the gap between the inner pipe and the outer pipe is 5 cm-9 cm.