Solid waste leachate low-temperature crystallization device

Abstract

The utility model relates to the technical field of crystallization equipment, and discloses a solid waste leachate low-temperature crystallization device, which comprises a crystallization chamber, a condensation heat exchange chamber, a compressor, a vacuum pump and a circulating pipe, the top of the crystallization chamber is communicated with the bottom of the condensation heat exchange chamber, the condensation heat exchange chamber is communicated with the vacuum pump, and the vacuum pump is used for keeping vacuum states in the crystallization chamber and the condensation heat exchange chamber. A heat exchanger is arranged at the top in the condensation heat exchange chamber, a condensation water tank is arranged at the bottom in the condensation heat exchange chamber, and an outlet of the heat exchanger is sequentially communicated with the compressor, the crystallization chamber and an inlet of the heat exchanger through circulating pipes. The utility model has the advantages of low energy consumption, stable and safe operation, and good market prospect.

Description

Technical Field

[0001] The utility model relates to the technical field of crystallization equipment, in particular to a low-temperature crystallization device for solid waste leachate. Background Art

[0002] A large amount of solid waste is generated in industrial production and life, such as industrial sludge, slag, etc. During the landfill and stacking process of solid waste, the water generated by the decomposition of organic matter in the waste, the free water in the waste, precipitation, and the infiltrated groundwater, the sewage formed by leaching is called solid waste leachate.

[0003] Solid waste leachate is a high-concentration sewage, which seriously pollutes the environment and groundwater. As the landfill time increases, the water quality of the leachate changes from organic nitrogen to inorganic nitrogen. The phosphorus element in the leachate is deficient, resulting in a decrease in the concentration of dissolved phosphates and poor biodegradability. At the same time, it contains a wide variety of metal ions. Therefore, solid waste leachate is one of the most difficult wastewaters to treat.

[0004] At present, when treating leachate, evaporation concentration and crystallization are basically used to remove harmful substances in the leachate before discharge. However, in the existing crystallization treatment technology, the crystallization system needs to use different cold sources and heat sources to evaporate the leachate at high temperature and condense it at low temperature, resulting in high energy consumption and high cost of use of the crystallization system. Utility Model Content

[0005] The utility model aims to provide a low-temperature crystallization device for solid waste leachate, which is used to solve the technical problems of high processing energy consumption and high processing cost in the existing low-temperature crystallization system.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A low-temperature crystallization device for solid waste leachate, comprising a crystallization chamber, a condensation heat exchange chamber, a compressor, a vacuum pump and a circulation pipe, wherein the top of the crystallization chamber is connected to the bottom of the condensation heat exchange chamber, the condensation heat exchange chamber is connected to the vacuum pump, and the vacuum pump is used to maintain a vacuum state in the crystallization chamber and the condensation heat exchange chamber;

[0008] A heat exchanger is provided at the top of the condensation heat exchange chamber, a condensation water tank is provided at the bottom of the condensation heat exchange chamber, and the outlet of the heat exchanger is connected with the compressor, the crystallization chamber and the inlet of the heat exchanger in sequence through a circulation pipe.

[0009] Furthermore, the above-mentioned low-temperature crystallization system also includes a condensate collection system, which includes a condensate pipe and a connected condensate tank and a drainage pump; the condensate tank is connected to the condensate tank and the top of the condensation heat exchange chamber through the condensate pipe.

[0010] Furthermore, the crystallization chamber comprises a crystallization chamber barrel body and a spiral stirring rod disposed in the crystallization chamber barrel body, and a stirring motor for driving the spiral stirring rod is disposed at the outer end of the crystallization chamber barrel body.

[0011] Furthermore, a raw material inlet and a crystallization material outlet are respectively provided at two ends of the crystallization chamber barrel; the raw material inlet and the stirring motor are located at the same end.

[0012] Furthermore, a heat medium outlet is provided at the upper part of the crystallization chamber barrel body, and a heat medium inlet is provided at the lower part of the crystallization chamber barrel body; the heat medium outlet is communicated with the inlet of the heat exchanger, and the heat medium inlet is communicated with the compressor.

[0013] Furthermore, an expansion valve is provided on the circulation pipe between the crystallization chamber and the compressor.

[0014] Furthermore, the vacuum pump is connected to the condensate tank.

[0015] Beneficial effects of the utility model:

[0016] The utility model introduces a vacuum pump during the evaporation and crystallization process of the leachate, reduces the internal pressure of the crystallizer, and improves the vacuum degree, so that the leachate can be evaporated and crystallized at a lower temperature, thereby increasing the evaporation rate. At the same time, the inventor also uses the effect of the compressor on the cold medium after heat exchange, changes its temperature by changing the pressure and state of the cold medium, controls the cold medium to release heat and heat the material when in contact with the material, and the cold medium is cooled and liquefied, and the temperature drops, and then the liquefied cold medium is transported to the steam condensation area through a pipeline, and the low temperature of the cold medium is used to condense water vapor, and the cold medium absorbs heat and vaporizes again, enters the compressor for recirculation, and the cold and heat sources are used in both directions during the whole process, so as to achieve the purpose of reducing energy consumption and saving costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a structural schematic diagram of a low-temperature crystallization device for solid waste leachate of the utility model.

[0018] The reference numerals in the figure are: crystallization chamber 1, condensation heat exchange chamber 2, compressor 3, vacuum pump 4, circulation pipe 5, condensate collection system 6, expansion valve 7;

[0019] Crystallization chamber barrel 101, spiral stirring rod 102, stirring motor 103, raw material inlet 104, crystallization material outlet 105, heat medium outlet 106, heat medium inlet 107;

[0020] Heat exchanger 201, condensation water tank 202;

[0021] Condensate tank 601 , drainage pump 602 , and condensate pipe 603 . DETAILED DESCRIPTION

[0022] In order to explain the structure and working principle of the present invention in detail, the following will combine the embodiments and drawings to clearly and completely describe the technical solution of the present invention. The specific implementation method is as follows: Example

[0023] As attached Figure 1 As shown, a low-temperature crystallization device for solid waste leachate includes a crystallization chamber 1, a condensation heat exchange chamber 2, a compressor 3, a vacuum pump 4 and a circulation pipe 5, wherein the top of the crystallization chamber 1 is connected to the bottom of the condensation heat exchange chamber 2, and the condensation heat exchange chamber 2 is connected to the vacuum pump 4, and the vacuum pump 4 is used to maintain a vacuum state in the crystallization chamber 1 and the condensation heat exchange chamber 2.

[0024] A heat exchanger 201 is provided at the top of the condensation heat exchange chamber 2, and a condensation water tank 202 is provided at the bottom of the condensation heat exchange chamber 2. The outlet of the heat exchanger 201 is connected with the compressor 3, the crystallization chamber 1 and the inlet of the heat exchanger 201 in sequence through the circulation pipe 5 to form a circulation pipeline, thereby improving energy utilization efficiency and reducing energy consumption.

[0025] The utility model further includes a condensate collection system 6, which includes a condensate pipe 603 and a connected condensate tank 601 and a drainage pump 602. The condensate tank 601 is connected to the condensate tank 202 and the top of the condensation heat exchange chamber 2 through the condensate pipe 603. The condensate tank 601 can collect the condensate gathered in the condensate tank 202 and formed after heat exchange at the top of the condensation heat exchange chamber 2, and then discharge it from the crystallization system through the condensate pipe 603 and the drainage pump 602.

[0026] The crystallization chamber 1 comprises a crystallization chamber barrel 101 and a spiral stirring rod 102 disposed in the crystallization chamber barrel 101. The outer end of the crystallization chamber barrel 101 is provided with a stirring motor 103 for driving the spiral stirring rod 102. The stirring motor 103 and the spiral stirring rod 102 can increase the heat exchange effect of the percolate, and ensure that the percolate in the crystallizer 1 is uniformly and completely crystallized.

[0027] The two ends of the crystallization chamber barrel 101 are respectively provided with a raw material inlet 104 and a crystallization material outlet 105, and the raw material inlet 104 and the stirring motor 103 are located at the same end. After the crystallization is completed, the impurities in the filtrate are discharged from the crystallizer 1 through the crystallization material outlet 105.

[0028] A heat medium outlet 106 is provided at the upper part of the crystallization chamber barrel 101, and a heat medium inlet 107 is provided at the lower part of the crystallization chamber barrel 101. The heat medium outlet 106 is communicated with the inlet of the heat exchanger 201, and the heat medium inlet 107 is communicated with the compressor 3. The heat medium compressed by the compressor 3 enters the crystallizer 1 through the heat medium inlet 107, and can heat the percolate in the crystallizer 1, so that the percolate forms steam and then enters the heat exchanger 201 through the heat medium outlet 106 for heat exchange, and this cycle ensures the continuous use of heat and reduces energy consumption.

[0029] An expansion valve 7 is provided on the circulation pipe 5 between the crystallization chamber 1 and the compressor 3. After the heat medium fluid compressed by the compressor 3 passes through the throttling of the expansion valve 7, the temperature and pressure are further reduced, which ensures the cold and heat balance of the crystallization system, makes the temperature of the condensation heat exchange chamber and the crystallization chamber within a controllable range, and allows the compressor to operate within the allowable range, providing conditions for the crystallizer to crystallize at a lower temperature.

[0030] The vacuum pump 4 is connected to the condensed water tank 601 .

[0031] The use process and principle of the utility model are as follows: the vacuum pump 4 draws the inside of the crystallization chamber 1 and the condensation heat exchange chamber 2 into a vacuum state, and the solid waste leachate enters the crystallization chamber barrel 101 through the raw material inlet 104, and can be evaporated and concentrated at a lower temperature under the stirring of the spiral stirring rod 102. The initially evaporated steam enters the condensation heat exchange chamber 2 through the heat medium outlet 106 and the top of the crystallization chamber 1, contacts the heat exchanger 201 and exchanges heat with the cold medium in the heat exchanger 201. After the heat exchange, the steam condenses and falls into the condensation water tank 202, and then is discharged through the condensation water collection system 6. The cold medium in the heat exchanger 201 is heated after the heat exchange, and after being compressed by the compressor 3, it is introduced into the crystallizer 1 through the expansion valve 7 and heats the leachate in the crystallizer 1, and the cycle is repeated. The leachate in the crystallizer 1 is continuously evaporated and vaporized, and finally the leachate reaches saturated crystallization, and the dry material after crystallization is discharged from the crystallization material outlet 105.

[0032] In summary, the utility model introduces a vacuum pump during the evaporation and crystallization of the leachate, reduces the internal pressure of the crystallizer, and increases the vacuum degree, so that the leachate can be evaporated and crystallized at a lower temperature, thereby increasing the evaporation rate. At the same time, the inventor also uses the effect of the compressor on the cold medium after heat exchange, changes its temperature by changing the pressure and state of the cold medium, controls the cold medium to release heat and heat the material when in contact with the material, and the cold medium is cooled and liquefied, and the temperature drops. The liquefied cold medium is then transported to the steam condensation area through a pipeline, and the low temperature of the cold medium is used to condense water vapor. The cold medium absorbs heat and vaporizes again, enters the compressor and circulates again. The cold and heat sources are used in both directions during the whole process, thereby achieving the purpose of reducing energy consumption and saving costs.

[0033] The above shows and describes the basic principles, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principles of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A low-temperature crystallization device for solid waste leachate, characterized in that: It comprises a crystallization chamber (1), a condensation heat exchange chamber (2), a compressor (3), a vacuum pump (4) and a circulation pipe (5); the top of the crystallization chamber (1) is connected to the bottom of the condensation heat exchange chamber (2), the condensation heat exchange chamber (2) is connected to the vacuum pump (4), and the vacuum pump (4) is used to maintain a vacuum state in the crystallization chamber (1) and the condensation heat exchange chamber (2); A heat exchanger (201) is provided at the top of the condensation heat exchange chamber (2), a condensation water tank (202) is provided at the bottom of the condensation heat exchange chamber (2), and the outlet of the heat exchanger (201) is connected to the compressor (3), the crystallization chamber (1), and the inlet of the heat exchanger (201) in sequence through a circulation pipe (5).

2. A solid waste leachate low-temperature crystallization device according to claim 1, characterized in that: It also includes a condensate collection system (6), the condensate collection system (6) including a condensate pipe (603) and a connected condensate tank (601) and a drainage pump (602); the condensate tank (601) is connected to the condensate tank (202) and the top of the condensation heat exchange chamber (2) through the condensate pipe (603).

3. A solid waste leachate low-temperature crystallization device according to claim 1, characterized in that: The crystallization chamber (1) comprises a crystallization chamber barrel (101) and a spiral stirring rod (102) disposed in the crystallization chamber barrel (101); a stirring motor (103) for driving the spiral stirring rod (102) is provided at the outer end of the crystallization chamber barrel (101).

4. A solid waste leachate low-temperature crystallization device according to claim 3, characterized in that: The two ends of the crystallization chamber barrel (101) are respectively provided with a raw material inlet (104) and a crystallization material outlet (105); the raw material inlet (104) and the stirring motor (103) are located at the same end.

5. A solid waste leachate low-temperature crystallization device according to claim 4, characterized in that: The upper portion of the crystallization chamber barrel body (101) is provided with a heat medium outlet (106), and the lower portion of the crystallization chamber barrel body (101) is provided with a heat medium inlet (107); the heat medium outlet (106) is in communication with the inlet of the heat exchanger (201), and the heat medium inlet (107) is in communication with the compressor (3).

6. The solid waste leachate low-temperature crystallization device according to claim 1, characterized in that: An expansion valve (7) is provided on the circulation pipe (5) between the crystallization chamber (1) and the compressor (3).

7. The solid waste leachate low-temperature crystallization device according to claim 1, characterized in that: The vacuum pump (4) is in communication with the condensate tank (601).

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