CN110694287A - Low temperature evaporative crystallizer - Google Patents

Abstract

The invention discloses a low-temperature evaporative crystallizer, which comprises a shell, and is characterized in that: a first baffle plate and a second baffle plate are arranged in the shell, and the first and second baffle plates divide the inner cavity of the shell into inlets. The water chamber, the middle chamber and the evaporation chamber are arranged up and down in the middle chamber with multi-layer crystallization chambers. A first ventilation hole is provided to conduct the crystallization chamber and the water inlet chamber, and the second baffle plate is provided with a second ventilation hole and a drainage hole to conduct the crystallization chamber and the evaporation chamber. There is a water distribution pipe on one side of the water inlet chamber, the water distribution pipe is connected with the water inlet pipe, a heating component is installed in the middle chamber, a water atomizer is installed in the evaporation chamber, the evaporation chamber is connected with the blowing pipe, and the water inlet chamber is connected with The suction pipe and the blowing pipe are connected to the hot air blower. The invention has the advantages of compact structure and low energy consumption.

Description

Low temperature evaporative crystallizer

technical field

The invention belongs to the technical field of evaporative crystallization, in particular to a low-temperature evaporative crystallizer.

Background technique

The evaporative crystallizer uses the evaporation of part of the solvent to make the solution reach a state of supersaturation, and at the same time analyzes the salt (not just sodium chloride) in the solution. Among them, some manufacturers also use evaporative crystallizers in sewage treatment, and separate water and salt components in water through evaporative crystallizers. The more common evaporator principle is to use the heating method to evaporate the water, so that the salt in the water is precipitated, but this method generally has the defect of excessive energy consumption.

SUMMARY OF THE INVENTION

In view of the deficiencies in the background technology, the purpose of the present invention is to provide a low-temperature evaporative crystallizer with the advantages of compact structure and low energy consumption.

The present invention is implemented through the following technical solutions:

The low-temperature evaporative crystallizer includes a shell, and is characterized in that: the shell is provided with a first baffle plate and a second baffle plate, and the first and second baffle plates divide the inner cavity of the shell into a water inlet chamber and an intermediate cavity. chamber and evaporation chamber, the middle chamber is arranged with multi-layer crystallization chambers up and down, the bottom plate of each layer of crystallization chamber is an inclined crystal plate, the top plate is an inclined filter cloth, and the first baffle plate is provided with a first ventilation hole The crystallization chamber and the water inlet chamber are connected, the second baffle plate is provided with second ventilation holes and drainage holes to conduct the crystallization chamber and the evaporation chamber, and the filter cloth of each layer of the crystallization chamber is on the side of the water inlet chamber A water distribution pipe is provided, the water distribution pipe communicates with the water inlet pipe, a heating component is installed in the middle chamber, a water atomizer is installed in the evaporation chamber, the evaporation chamber is connected with a blowing pipe, and the water inlet chamber is connected with a suction pipe. The blowing duct is connected to the hot air blower.

The low-temperature evaporative crystallizer of the above technical solution has a compact structure and low energy consumption. When treating sewage, the sewage is first pumped into the water distribution pipe through the water inlet pipe by the action of the pump, and the water distribution pipe divides the sewage into several small trickles to flow down. On the filter cloth, the filter cloth is inclined, so under the gravity of the liquid and the guidance of the filter cloth, the liquid descends to the lower end of the filter cloth and flows to the crystallization plate along the second baffle plate. The heated part has a relatively high temperature (the heating temperature is generally between 50-100 degrees, depending on the nature of different sewage), so when the small stream of sewage flows on the filter cloth, part of the water that tends to be infinitely diluted will be released. It evaporates directly and is sucked away by the suction pipe through the first ventilation hole, and the liquid is concentrated; next, the concentrated liquid flowing to the crystallization plate enters the evaporation chamber through the drainage hole, and in the evaporation chamber, the water atomizer will The liquid is atomized, so that the liquid forms droplets with a small particle size, and the droplets rapidly form gas under the action of hot air blowing (the temperature of the hot air blowing is lower than the heating temperature of the intermediate chamber), and the salt is also precipitated from the water. The air blowing and the air suction pipe make a negative pressure effect between the water inlet chamber, the middle chamber and the evaporation chamber, so that the gas in the evaporation chamber passes through the second ventilation hole, the crystallization cavity and the first ventilation hole in turn and then enters into the air. The water enters the chamber and is discharged through the suction pipe; when the gas passes through the crystallization chamber, the gas will contact the crystallizing plate, and the inclined crystallizing plate increases the crystal contact area. Evaporate out and be sucked away by the suction pipe, while the salt component is precipitated on the crystallizing plate (the crystallizing plate needs to be cleaned regularly). In the above process, when the small stream of sewage passes through the filter cloth, the filter cloth can also absorb the oil stains in the sewage, so that the atomized sewage quickly turns into a gas when it contacts with the hot air blower.

Preferably, the water distribution pipes are arranged in a row along the setting direction of the filter cloth. The above design can ensure that the sewage forms a whole row of small fines and flows down to the filter cloth.

Preferably, the crystal plate and the filter cloth have the same inclination direction.

Preferably, the shell, the first baffle plate, the second baffle plate and the crystallizing plate are stainless steel plates of 306 or 316 grades.

The filter cloth is made of vinylon material.

The bottom of the evaporation chamber is provided with a return pipe, the return pipe is connected with the water inlet pipe, and a return pump is installed on the pipe of the return pipe. The above design can return the excess residual liquid in the evaporation chamber to the water inlet pipe through the return pipe for circulating evaporation, so that the evaporation chamber can continue to work normally.

Description of drawings

The present invention has the following accompanying drawings:

Fig. 1 is the outline structure diagram of the present invention;

FIG. 2 is an internal structure diagram of the present invention.

Detailed ways

As shown in the figure, the low-temperature evaporative crystallizer of the present invention includes a casing 1, and a first baffle 2 and a second baffle 3 are arranged in the casing 1. The first and second baffles separate the inner cavity of the casing. It is divided into a water inlet chamber 4, a middle chamber 5 and an evaporation chamber 6. The middle chamber 5 is arranged with multi-layer crystallization chambers 7 up and down. The bottom plate of each layer of crystallization chamber 7 is an inclined crystal plate 71, and the top plate is The filter cloth 72 of the inclined setting, the crystallization plate 71 and the filter cloth 72 have the same inclination direction, the shell 1, the first baffle plate 2, the second baffle plate 3 and the crystal plate 71 are made of stainless steel of 306 or 316 grades The filter cloth 72 is made of vinylon material, the product number is 295-101, and the gram weight per square meter is 450g. The second baffle plate 3 is provided with a second ventilation hole 10 and a drainage hole 9 to conduct the crystallization chamber 5 with the evaporation chamber 6 . The drainage hole 9 is located below the second ventilation hole 10 and above the filter cloth 72 of each layer of the crystallization chamber 7 A water distribution pipe 13 is provided on one side of the water inlet chamber 4. The water distribution pipes 13 are arranged in a row along the setting direction of the filter cloth 72. The water distribution pipe 13 communicates with the water inlet pipe 16. The water inlet pipe 16 is supplied with sewage by the pump 17. An electric heating element 19 is installed in the chamber 5, and the working temperature of the electric heating element 19 is between 50-100 degrees. An ultrasonic water atomizer 8 is installed at the bottom of the evaporation chamber 6, and the evaporation chamber 6 is connected to the blowing pipe 11. , the blowing pipe 11 is connected to the hot air blower 12, the outlet of the blowing pipe 11 penetrates into the inside of the evaporation chamber 6 and is aligned with the atomized water outlet of the ultrasonic water atomizer 8, the water inlet chamber 4 is connected to the suction pipe 15, and the suction The pipe 15 is communicated with the exhaust fan, the bottom of the evaporation chamber 6 is provided with a return pipe 14 , the return pipe 14 is connected with the water inlet pipe 16 , and a return pump 20 is installed on the pipe of the return pipe 14 .

The above-mentioned low-temperature evaporative crystallizer, when treating sewage, firstly uses the action of the water pump to pump the sewage into the water distribution pipe through the water inlet pipe, and the water distribution pipe divides the sewage into several small fines and flows down to the filter cloth, under the gravity of the liquid. And under the guidance of the filter cloth, the liquid tends to be thinned and descend to the lower end of the filter cloth, and flow to the crystallization plate along the second baffle plate, and then enter the evaporation chamber through the drainage hole, where the water The atomizer will atomize the liquid, and under the action of hot air blowing, the moisture will be quickly turned into gas, and the salt will also be precipitated from the water. A negative pressure effect is formed between the chambers, so that the gas in the evaporation chamber enters the water inlet chamber through the second ventilation hole, the crystallization chamber and the first ventilation hole in turn, and is discharged through the suction pipe; after the gas passes through the crystallization chamber When the crystallization chamber is heated, the temperature of the crystallization plate is high, so the water can be evaporated and sucked away by the suction pipe, while the salt component is precipitated on the crystallization plate, and the return pump passes through The return pipe returns the liquid remaining in the evaporation chamber back to the water inlet pipe for circulating evaporation.

Claims (7)

1. Low temperature evaporation crystallizer, including the casing, its characterized in that: the shell is internally provided with a first baffle plate and a second baffle plate, the first baffle plate and the second baffle plate divide an inner cavity of the shell into a water inlet cavity, a middle cavity and an evaporation cavity, a plurality of layers of crystallization cavities are vertically arranged in the middle cavity, a bottom plate of each layer of crystallization cavity is a crystallization plate which is obliquely arranged, a top plate is filter cloth which is obliquely arranged, the first baffle plate is provided with a first air hole to communicate the crystallization cavity with the water inlet cavity, the second baffle plate is provided with a second air hole and a water drain hole to communicate the crystallization cavity with the evaporation cavity, a water distribution pipe is arranged on one side of the water inlet cavity above the filter cloth of each layer of crystallization cavity, the water distribution pipe is communicated with a water inlet pipe, a heating part is arranged in the middle cavity, a water atomizer is arranged in the evaporation cavity, the evaporation cavity is connected with a blowing pipe.

2. The low temperature evaporative crystallizer of claim 1: the method is characterized in that: the blowpipe is communicated with a hot air fan.

3. The cryogenic evaporative crystallizer of claim 1, wherein: the water distribution pipes are arranged in rows along the arrangement direction of the filter cloth.

4. The cryogenic evaporative crystallizer of claim 1, wherein: the crystallizing plate and the filter cloth have the same inclined direction.

5. The cryogenic evaporative crystallizer of claim 1, wherein: the shell, the first baffle plate, the second baffle plate and the crystallization plate are made of 306 or 316-grade stainless steel plates.

6. The cryogenic evaporative crystallizer of claim 1, wherein: the filter cloth is made of vinylon materials.

7. The cryogenic evaporative crystallizer of claim 1, wherein: the bottom of the evaporation chamber is provided with a return pipe, the return pipe is connected with a water inlet pipe, and a return pump is arranged on a pipeline of the return pipe.

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