CN211705922U

CN211705922U - Defoaming structure of forced circulation evaporation crystallization system

Info

Publication number: CN211705922U
Application number: CN201922432548.4U
Authority: CN
Inventors: 龚卫星
Original assignee: Shanghai Qingye Energy Co ltd
Current assignee: Shanghai Qingye Energy Co ltd
Priority date: 2019-12-30
Filing date: 2019-12-30
Publication date: 2020-10-20
Anticipated expiration: 2029-12-30

Abstract

The utility model relates to a forced circulation evaporation crystallization system's defoaming structure, including the evaporimeter, crystal separator and condenser, the evaporimeter passes through pipeline and crystal separator intercommunication, be equipped with labyrinth demister between crystal separator and the condenser, labyrinth demister includes the shell, the steam inlet, the steam outlet, labyrinth defoaming bars and washing shower nozzle, steam inlet and steam outlet are located the both sides of shell symmetry respectively, labyrinth defoaming bars set up in the shell and corresponding with steam inlet and steam outlet, be equipped with the washing shower nozzle in steam inlet and the steam outlet respectively, crystal separator vapor phase export and steam inlet intercommunication, steam outlet and condenser intercommunication, labyrinth demister bottom is equipped with the leakage fluid dram, crystal separator's bottom is equipped with the backward flow mouth, labyrinth demister's leakage fluid dram passes through the backward flow and crystal separator's backward flow mouth intercommunication. The utility model discloses can avoid the pressure drop increase or too big increase of evaporation crystallization equipment, realize the online cleanness to the demister, convenient clean operation.

Description

Defoaming structure of forced circulation evaporation crystallization system

Technical Field

The utility model belongs to the technical field of vapour-liquid two-phase flow equipment removes the foam, especially relates to a forced circulation evaporation crystal system remove foam structure.

Background

Entrainment of liquid foam is a common phenomenon in evaporators, crystallizers, distillation columns and other equipment with vapor-liquid two-phase flow. Entrainment of liquid foam will result in a reduction in the quality of the evaporator and crystallizer condensate, increasing the cost of subsequent water treatment. In distillation equipment, liquid foam entrainment causes product loss, tower plate efficiency is reduced, flooding of a tower and the like is caused in severe cases, and the equipment cannot normally run.

In order to prevent and reduce entrainment of liquid foam, in the prior art, it is generally necessary to install a demister in an evaporator, a crystallizer or a distillation tower, and the types of the demister are various, such as a wire mesh structure, a grid structure and the like, for example, a wire mesh demister structure in the existing forced circulation evaporative crystallization system as shown in fig. 1. The prior art of this defoaming structure has the disadvantages that: the pressure drop is increased when the demister is arranged in the vapor-liquid two-phase flow equipment, particularly, the equipment load is seriously increased when the pressure drop of the equipment is obviously increased when the demister is blocked, and even the demister falls off; in addition, the demister needs to be cleaned regularly, the cleaning operation of the existing structure is complex, the machine needs to be stopped for cleaning, and the production efficiency is reduced.

Disclosure of Invention

The utility model aims to solve the technical problem that a forced circulation evaporation crystallization system's defoaming structure is provided, reduces the influence that leads to the equipment pressure drop to increase, realizes the online cleanness to the demister, convenient clean operation.

The utility model provides a technical scheme who solves its technical problem adopts provides a defoaming structure of forced circulation evaporation crystallization system, including evaporimeter, crystal separator and condenser, the discharge gate of evaporimeter passes through the pipeline and communicates with crystal separator's feed inlet, be equipped with labyrinth demister between crystal separator and the condenser, labyrinth demister includes shell, steam inlet, steam outlet, labyrinth defoaming bars and washs the shower nozzle, steam inlet and steam outlet are located the both sides of shell symmetry respectively, labyrinth defoaming bars sets up in the shell and both sides face respectively with steam inlet and steam outlet corresponding, be equipped with the washing shower nozzle towards labyrinth defoaming bars in steam inlet and the steam outlet respectively, crystal separator's vapour phase export communicates with steam inlet through the pipeline, steam outlet communicates with the condenser through the pipeline, the labyrinth demister is characterized in that a liquid outlet is formed in the bottom of the labyrinth demister, a backflow port is formed in the bottom of the crystallization separator, and the liquid outlet of the labyrinth demister is communicated with the backflow port of the crystallization separator through a backflow pipe.

The inner part of the shell is provided with a mounting bracket of a labyrinth defoaming grid, and sealing plates connected with the inner wall of the shell are respectively arranged at the top and the bottom of one side of the labyrinth defoaming grid, which is opposite to the steam outlet.

And the cleaning spray heads are respectively connected with the cleaning liquid conveying pipes.

Advantageous effects

The utility model arranges the labyrinth demister between the crystallization separator and the condenser, and the demister and the crystallization separator are of a separate structure, so that the demister is relatively independent from the forced circulation evaporation crystallization system, thereby being beneficial to reducing the influence on the pressure drop of the forced circulation evaporation crystallization system and avoiding the pressure drop increase or overlarge increase of the evaporation crystallization equipment; the utility model discloses a wash the shower nozzle and can remove the foam bars to the labyrinth and carry out online cleanness, be favorable to improving production efficiency, easy and simple to handle, the washing liquid can flow back to forced circulation evaporation crystallization system and participate in circulation evaporation crystallization.

Drawings

FIG. 1 is a schematic structural diagram of a conventional forced circulation evaporative crystallization system.

Fig. 2 is a schematic structural diagram of the present invention.

FIG. 3 is a schematic structural diagram of a labyrinth skimmer.

FIG. 4 is a schematic sectional view of a labyrinth type defoaming grid.

Detailed Description

The present invention will be further described with reference to the following specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Furthermore, it should be understood that various changes and modifications of the present invention may be made by those skilled in the art after reading the teachings of the present invention, and these equivalents also fall within the scope of the appended claims.

The defoaming structure of the forced circulation evaporative crystallization system as shown in fig. 2 comprises an evaporator 1 (see fig. 1), a crystallization separator 2 and a condenser 3 (see fig. 1), wherein a discharge port of the evaporator 1 is communicated with a feed port of the crystallization separator 2 through a pipeline, and a concentrate outlet of the crystallization separator 2 is communicated with the feed port of the evaporator 1 through a pipeline to form circulation.

A labyrinth demister 4 is arranged between the crystallization separator 2 and the condenser 3. As shown in fig. 3 and 4, the labyrinth demister 4 includes a housing 4-1, a steam inlet 4-2, a steam outlet 4-3, a labyrinth demister 4-4, and a cleaning nozzle 4-5. The steam inlet 4-2 and the steam outlet 4-3 are respectively positioned at the two symmetrical sides of the shell 4-1. The vapor phase outlet of the crystallization separator 2 is communicated with a vapor inlet 4-2 through a pipeline, and a vapor outlet 4-3 is communicated with a condenser 3 through a pipeline. The labyrinth demister 4 bottom is equipped with the leakage fluid dram, and the bottom of crystal separator 2 is equipped with the backward flow mouth, and the leakage fluid dram of labyrinth demister 4 passes through the backward flow mouth intercommunication of back flow 5 with crystal separator 2.

The labyrinth defoaming grid 4-4 is supported and installed in the shell 4-1 through an installation support, and two side surfaces of the labyrinth defoaming grid 4-4 correspond to the steam inlet 4-2 and the steam outlet 4-3 respectively. The labyrinth defoaming grid 4-4 is provided with sealing plates connected with the inner wall of the shell 4-1 at the top and the bottom respectively at one side opposite to the steam outlet 4-3, so that steam is ensured to flow to the condenser 3 through the labyrinth defoaming grid 4-4. The labyrinth type demister 4-4 is a commercial product, and its structure is not described in detail and is not limited to the structure shown in fig. 4. The steam separated from the crystallization separator 2 enters the labyrinth demister 4 and is defoamed by the labyrinth defoaming grid 4-4, liquid foam with materials is intercepted and falls down to flow back to the crystallization separator 2 from the return pipe 5 to participate in evaporative crystallization circulation, and material loss is effectively avoided.

The steam inlet 4-2 and the steam outlet 4-3 are respectively provided with a cleaning nozzle 4-5 facing the labyrinth defoaming grid 4-4, the cleaning nozzle 4-5 is respectively connected with a cleaning liquid conveying pipe 6, the labyrinth defoaming grid 4-4 can be cleaned on line through the cleaning nozzle 4-5, the production efficiency is improved, the operation is simple and convenient, and the cleaning liquid can flow back to the forced circulation evaporation crystallization system to participate in circulation evaporation crystallization.

Claims

1. The utility model provides a defoaming structure of forced circulation evaporation crystallization system, includes evaporimeter (1), crystallization separator (2) and condenser (3), the discharge gate of evaporimeter (1) passes through the feed inlet intercommunication of pipeline with crystallization separator (2), its characterized in that: a labyrinth demister (4) is arranged between the crystallization separator (2) and the condenser (3), the labyrinth demister (4) comprises a shell (4-1), a steam inlet (4-2), a steam outlet (4-3), a labyrinth defoaming grid (4-4) and a cleaning spray head (4-5), the steam inlet (4-2) and the steam outlet (4-3) are respectively positioned at two symmetrical sides of the shell (4-1), the labyrinth defoaming grid (4-4) is arranged in the shell (4-1), two side surfaces of the labyrinth defoaming grid respectively correspond to the steam inlet (4-2) and the steam outlet (4-3), the steam inlet (4-2) and the steam outlet (4-3) are respectively provided with the cleaning spray head (4-5) facing the labyrinth defoaming grid (4-4), the vapor phase outlet of the crystallization separator (2) is communicated with the vapor inlet (4-2) through a pipeline, the vapor outlet (4-3) is communicated with the condenser (3) through a pipeline, a liquid discharge port is arranged at the bottom of the labyrinth demister (4), a backflow port is arranged at the bottom of the crystallization separator (2), and the liquid discharge port of the labyrinth demister (4) is communicated with the backflow port of the crystallization separator (2) through a backflow pipe (5).

2. The defoaming structure of a forced circulation evaporative crystallization system as set forth in claim 1, wherein: the inner part of the shell (4-1) is provided with a mounting bracket of a labyrinth defoaming grid (4-4), and the top and the bottom of one side of the labyrinth defoaming grid (4-4) opposite to the steam outlet (4-3) are respectively provided with a sealing plate connected with the inner wall of the shell (4-1).

3. The defoaming structure of a forced circulation evaporative crystallization system as set forth in claim 1, wherein: the cleaning nozzles (4-5) are respectively connected with a cleaning liquid conveying pipe (6).