Low temperature evaporation crystallizer

Abstract

The invention discloses a low-temperature evaporation crystallizer, comprising a shell, characterized in that: a first baffle plate and a second baffle plate are arranged in the shell, the first and second baffle plates divide the inner cavity of the shell into a water inlet chamber, an intermediate chamber and an evaporation chamber, multiple layers of crystallization chambers are arranged up and down in the intermediate chamber, the bottom plate of each layer of crystallization chamber is an inclined crystallization plate, the top plate is an inclined filter cloth, the first baffle plate is provided with a first air vent to connect the crystallization chamber with the water inlet chamber, the second baffle plate is provided with a second air vent and a drain hole to connect the crystallization chamber with the evaporation chamber, a water distribution pipe is provided above the filter cloth of each layer of crystallization chamber on one side of the water inlet chamber, the water distribution pipe is communicated with the water inlet pipe, a heating component is installed in the intermediate chamber, a water atomizer is installed in the evaporation chamber, the evaporation chamber is connected to a blowing pipe, the water inlet chamber is connected to a suction pipe, and the blowing pipe is connected to a hot air blower. The invention has the advantages of compact structure and low energy consumption.

Description

Technical Field

[0001] The invention belongs to the technical field of evaporation crystallization, and in particular relates to a low-temperature evaporation crystallizer. Background Art

[0002] The evaporation crystallizer uses the evaporation of part of the solvent to make the solution reach a supersaturated state, and at the same time, the salt in the solution (not just sodium chloride) is analyzed out. Some manufacturers also use evaporation crystallizers in sewage treatment to separate water from the salt components in the water. The more common evaporator principle is to use heating to evaporate water, thereby precipitating the salt in the water, but this method generally has the defect of high energy consumption. Summary of the invention

[0003] In view of the shortcomings of the background technology, the object of the present invention is to provide a low-temperature evaporation crystallizer with the advantages of compact structure and low energy consumption.

[0004] The present invention is implemented by the following technical solutions:

[0005] The low-temperature evaporation crystallizer includes a shell, characterized in that: a first baffle plate and a second baffle plate are provided in the shell, the first and second baffle plates divide the inner cavity of the shell into a water inlet chamber, an intermediate chamber and an evaporation chamber, multiple layers of crystallization chambers are arranged up and down in the intermediate chamber, the bottom plate of each layer of crystallization chamber is an inclined crystallization plate, the top plate is an inclined filter cloth, the first baffle plate is provided with a first air vent to connect the crystallization chamber with the water inlet chamber, the second baffle plate is provided with a second air vent and a drain hole to connect the crystallization chamber with the evaporation chamber, a water distribution pipe is provided above the filter cloth of each layer of crystallization chamber on one side of the water inlet chamber, the water distribution pipe is communicated with the water inlet pipe, a heating component is installed in the intermediate chamber, a water atomizer is installed in the evaporation chamber, the evaporation chamber is connected to a blow pipe, and the water inlet chamber is connected to a suction pipe. The blow pipe is connected to a hot air blower.

[0006] The low-temperature evaporation 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 a pump. The water distribution pipe divides the sewage into several small streams and flows down to the filter cloth. The filter cloth is tilted, so under the gravity of the liquid and the guiding action of the filter cloth, the liquid flows down to the lower end of the filter cloth and flows along the second baffle plate to the crystallization plate. Since the crystallization chamber is heated by the heating component and has a high temperature (the heating temperature is generally between 50-100 degrees, depending on the nature of the sewage), when the small stream of sewage flows on the filter cloth, part of the water in the liquid that tends to be infinitely diluted will directly evaporate and be sucked away by the suction pipe through the first air hole, and the liquid will be concentrated; next, the concentrated liquid that flows to the crystallization plate enters the evaporation plate through the drainage hole. In the evaporation chamber, the water atomizer will atomize the liquid, so that the liquid forms droplets with very small particle size, and the droplets quickly form gas under the action of hot air (the temperature of the hot air is lower than the heating temperature of the middle chamber), and the salt is also precipitated from the water. At the same time, the blowing pipe blows and the suction pipe draws air to form 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 air hole, the crystallization chamber and the first air hole in turn and enters the water inlet chamber, and is discharged through the suction pipe; when the gas passes through the crystallization chamber, the gas will contact the crystallization plate. The inclined crystallization plate increases the crystallization contact area. Due to the high temperature of the crystallization plate, the water can be evaporated and sucked away by the suction pipe, while the salt component is precipitated on the crystallization plate (the crystallization 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 gas when it contacts the hot air.

[0007] 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 row of small streams flowing down to the filter cloth.

[0008] Preferably, the crystallization plate and the filter cloth have the same inclination direction.

[0009] Preferably, the shell, the first baffle plate, the second baffle plate and the crystallization plate are made of 306 or 316 grade stainless steel plates.

[0010] The filter cloth is made of vinylon material.

[0011] A reflux pipe is provided at the bottom of the evaporation chamber, the reflux pipe is connected to the water inlet pipe, and a reflux pump is installed on the reflux pipe. The above design can return the excess residual liquid in the evaporation chamber to the water inlet pipe through the reflux pipe for cyclic evaporation, so that the evaporation chamber can continue to work normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention has the following drawings:

[0013] Figure 1 It is the appearance structure diagram of the present invention;

[0014] Figure 2 It is the internal structure diagram of the present invention. DETAILED DESCRIPTION

[0015] As shown in the figure, the low-temperature evaporation crystallizer of the present invention includes a shell 1, a first baffle plate 2 and a second baffle plate 3 are arranged in the shell 1, the first and second baffle plates divide the inner cavity of the shell into a water inlet chamber 4, an intermediate chamber 5 and an evaporation chamber 6, and a plurality of crystallization chambers 7 are arranged in the upper and lower parts of the intermediate chamber 5, the bottom plate of each layer of the crystallization chamber 7 is an inclined crystallization plate 71, and the top plate is an inclined filter cloth 72, and 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 crystallization plate 71 are made of 306 or 316 stainless steel plates, the filter cloth 72 is made of vinylon material, product number 295-101, gram weight 450g per square meter, the first baffle plate 2 is provided with a first air vent 18 to connect the crystallization chamber 5 with the water inlet chamber 4, the second baffle plate 3 is provided with a second air vent 10 and a drainage hole 9 to connect the crystallization chamber 5 with the evaporation chamber 6, and the drainage hole 9 is located at Below the second vent hole 10, a water distribution pipe 13 is provided on one side of the water inlet chamber 4 above the filter cloth 72 of each layer of the crystallization chamber 7. The water distribution pipe 13 is arranged in a row in the front and back direction along the setting direction of the filter cloth 72. The water distribution pipe 13 is connected to the water inlet pipe 16. The water inlet pipe 16 is supplied with sewage by a water pump 17. An electric heating component 19 is installed in the middle chamber 5. The working temperature of the electric heating component 19 is between 50 and 100 degrees. The bottom of the evaporation chamber 6 is installed with An ultrasonic water atomizer 8 and an evaporation chamber 6 are connected to a blowing pipe 11, and the blowing pipe 11 is connected to a hot air blower 12. The outlet of the blowing pipe 11 penetrates into the interior 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 an air suction pipe 15, and the air suction pipe 15 is connected to the exhaust fan. A reflux pipe 14 is provided at the bottom of the evaporation chamber 6, and the reflux pipe 14 is connected to the water inlet pipe 16. A reflux pump 20 is installed on the reflux pipe 14.

[0016] When treating sewage, the low-temperature evaporation crystallizer described above first pumps the sewage through the water inlet pipe into the water distribution pipe through the action of the water pump. The water distribution pipe divides the sewage into several small streams and flows down to the filter cloth. Under the gravity of the liquid and the guiding action of the filter cloth, the liquid tends to be diluted and flows down to the lower end of the filter cloth, and flows along the second baffle plate to the crystallization plate, and then enters the evaporation chamber through the drainage hole. In the evaporation chamber, the water atomizer atomizes the liquid, and under the action of hot air, the water is quickly converted into gas, and the salt is precipitated from the water. At the same time, the air blower blows and sucks air. The pipe suction creates 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 air hole, the crystallization chamber and the first air hole in sequence and enters the water inlet chamber and is discharged through the suction pipe; when the gas passes through the crystallization chamber, the gas contacts the crystallization plate. Since the crystallization chamber is heated and the temperature of the crystallization plate is high, the water can be evaporated and sucked away by the suction pipe, while the salt component is precipitated on the crystallization plate. At the same time, the reflux pump returns the liquid remaining in the evaporation chamber to the water inlet pipe through the reflux pipe for cyclic evaporation.

Claims

1. A low-temperature evaporation crystallizer, comprising a shell, characterized in that: A first baffle plate and a second baffle plate are provided in the shell, and the first and second baffle plates divide the inner cavity of the shell into a water inlet chamber, an intermediate chamber and an evaporation chamber. Multiple layers of crystallization chambers are arranged up and down in the intermediate chamber, and the bottom plate of each layer of crystallization chamber is an inclined crystallization plate, and the top plate is an inclined filter cloth. The first baffle plate is provided with a first air vent to connect the crystallization chamber with the water inlet chamber, and the second baffle plate is provided with a second air vent and a drainage hole to connect the crystallization chamber with the evaporation chamber. A water distribution pipe is provided above the filter cloth of each layer of crystallization chamber on one side of the water inlet chamber, and the water distribution pipe is communicated with the water inlet pipe. A heating component is installed in the intermediate chamber, and a water atomizer is installed in the evaporation chamber. The evaporation chamber is connected to the blowing pipe, and the water inlet chamber is connected to the suction pipe; the water distribution pipes are arranged in a row along the setting direction of the filter cloth; the crystallization plate and the filter cloth have the same inclination direction; a reflux pipe is provided at the bottom of the evaporation chamber, and the reflux pipe is connected to the water inlet pipe, and a reflux pump is installed on the reflux pipe.

2. The low-temperature evaporation crystallizer according to claim 1 is characterized in that: The blowing pipe is connected to the hot air blower.

3. The low-temperature evaporation crystallizer according to claim 1, characterized in that: The shell, the first baffle plate, the second baffle plate and the crystallization plate are made of 306 or 316 grade stainless steel plates.

4. The low-temperature evaporation crystallizer according to claim 1, characterized in that: The filter cloth is made of vinylon material.

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