CN215084988U - Low-temperature evaporation crystallization equipment - Google Patents
Low-temperature evaporation crystallization equipment Download PDFInfo
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- CN215084988U CN215084988U CN202120809625.8U CN202120809625U CN215084988U CN 215084988 U CN215084988 U CN 215084988U CN 202120809625 U CN202120809625 U CN 202120809625U CN 215084988 U CN215084988 U CN 215084988U
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Abstract
The utility model discloses a low temperature evaporation crystallization equipment, include: a liquid storage tank, a preprocessor and a plurality of low-temperature evaporative crystallization devices; the liquid storage tank, the pre-processor and the low-temperature evaporative crystallization devices are communicated in series; stock solution is stored in the liquid storage tank; the pre-processor comprises a pre-processing tank and a pre-heating device, and can receive stock solution in the liquid storage tank and pre-heat the stock solution; the low-temperature evaporative crystallization device comprises a low-temperature evaporative crystallization chamber, a negative pressure system and a heating device, wherein the low-temperature evaporative crystallization chamber is of a sheath structure, and preheated stock solution introduced into the low-temperature evaporative crystallization chamber is evaporated in a vacuum and set low-temperature range to form crystals; the structure of the system enables the stock solution introduced into the low-temperature evaporative crystallization device to be preheated, so that the heating area and the heat transfer efficiency of the unit low-temperature evaporative crystallization device on a branch road are improved, the strength of low-temperature evaporative crystallization is improved, the crystallization processing time is shortened, and the increase of the evaporative crystallization processing capacity is further realized.
Description
Technical Field
The utility model relates to the technical field of mechanical equipment, especially, relate to a low temperature evaporation crystallization equipment.
Background
The evaporative crystallization device is widely applied to the industries of sewage treatment, chemical industry, non-ferrous metal industry, pesticide industry, food industry, pharmaceutical industry, ammonia desulphurization, mine smelting, steel mills, oil fields and the like, the evaporative crystallization equipment generally evaporates and recycles crystals such as ammonium chloride, potassium chloride, sodium sulfate and the like in solution, and the evaporative crystallization equipment heats feed liquid to concentrate and enlarge the feed liquid so as to separate out crystal grains.
The evaporative crystallization of liquid is generally treated by adopting a low-temperature evaporative concentration process, evaporative crystallization equipment in the prior art directly heats a single evaporative crystallization tank by repeated heat exchange, and when the evaporative crystallization is carried out on the solution in the mode, the solution is small in heated area, the evaporative crystallization speed is low, the heat transfer efficiency is low, the time consumption of the whole evaporative crystallization process is long, and the treatment capacity of the evaporative crystallization equipment is low.
In view of the above, there is a need for an improved evaporative crystallization apparatus in the prior art to solve the above problems.
Disclosure of Invention
The utility model overcomes prior art's is not enough, provides a low temperature evaporation crystallization equipment, aims at solving among the prior art low temperature evaporator heated area and heat transfer efficiency low, the little problem of evaporation crystallization throughput.
In order to achieve the above purpose, the utility model adopts the technical scheme that: a low temperature evaporative crystallization apparatus, comprising: a liquid storage tank, a preprocessor and a plurality of low-temperature evaporative crystallization devices; the liquid storage tank, the pre-processor and each low-temperature evaporative crystallization device are communicated in series;
stock solution is stored in the liquid storage tank, and the air pressure in the liquid storage tank is normal pressure; the pretreatment device comprises a pretreatment tank and a preheating device, the pretreatment device can receive the stock solution in the liquid storage tank and preheat the stock solution, and the air pressure in the pretreatment tank is normal pressure;
the low-temperature evaporative crystallization device comprises a low-temperature evaporative crystallization chamber, a negative pressure system and a heating device, wherein the low-temperature evaporative crystallization chamber is of a sheath structure, the inner layer of the low-temperature evaporative crystallization chamber is an evaporative crystallization cavity, and the outer side surface of the evaporative crystallization cavity is wrapped by the outer jacket cavity of the low-temperature evaporative crystallization chamber or the outer side surface and the bottom surface of the evaporative crystallization cavity are wrapped by the outer jacket cavity of the low-temperature evaporative crystallization chamber; the evaporation crystallization cavity in the inner layer of the low-temperature evaporation crystallization chamber can receive the stock solution preheated in the pre-processor, the evaporation crystallization cavity is also communicated with the negative pressure system, and the evaporation crystallization cavity is enabled to realize a vacuum environment through the negative pressure system; and the preheated stock solution which is introduced into the evaporation crystallization cavity is evaporated in a vacuum and set low temperature range to form crystals.
In a preferred embodiment of the present invention, the stock solution in the stock solution tank is fed into the pretreatment tank through a first feed pump.
In a preferred embodiment of the present invention, the pre-treatment tank of the pre-treatment device is internally or externally connected to the pre-heating device, so as to pre-heat the stock solution inside the pre-treatment tank.
In a preferred embodiment of the present invention, the pre-heating device in the pre-processor is separately provided, or the pre-heating device and the heating device in the low-temperature evaporation crystallization device are jointly provided.
In a preferred embodiment of the present invention, the negative pressure system is disposed in the low temperature evaporation crystallization device, and the vacuum pump is disposed in the negative pressure system, and the vacuum pump provides a vacuum environment for the evaporation crystallization cavity and reduces the boiling point of the liquid in the evaporation crystallization cavity.
In a preferred embodiment of the present invention, the liquid storage tank, the pre-processor and the low temperature evaporative crystallization device cooperate to form a plurality of evaporative crystallization branches, and the plurality of evaporative crystallization branches can share the second feeding pump, or each evaporative crystallization branch is provided with the second feeding pump separately.
In a preferred embodiment of the present invention, the liquid in each of the evaporative crystallization branches may or may not be in communication with each other.
In a preferred embodiment of the present invention, the pipeline connecting the pre-processor and the low temperature evaporation crystallizer is provided with a solenoid valve for adjusting the flow rate and speed of the fluid.
In a preferred embodiment of the present invention, a scraper is disposed in the evaporation crystallization cavity, and the scraper is used for scraping off the scaling substances or residues on the inner wall of the evaporation crystallization cavity.
In a preferred embodiment of the present invention, the stock solution can be a liquid that is not subjected to evaporation treatment, or a residual concentrated solution that is subjected to high-temperature evaporation or low-temperature evaporation treatment to reach a specified multiple.
In a preferred embodiment of the present invention, the liquid storage capacity of the liquid storage tank is greater than, equal to or less than the processing capacity of the pre-processor.
The utility model provides a defect that exists among the background art, the utility model discloses possess following beneficial effect:
(1) the utility model provides a low-temperature evaporative crystallization device, which is provided with a liquid storage tank, a preprocessor and a plurality of low-temperature evaporative crystallization devices; the structure enables the solution introduced into the low-temperature evaporative crystallization device to be preheated, improves the heating area and the heat transfer efficiency of the unit low-temperature evaporative crystallization device on a branch road, improves the strength of evaporative crystallization, reduces the crystallization processing time, and further achieves the increase of the evaporative crystallization processing amount.
(2) The utility model is provided with one or more low-temperature evaporative crystallization devices to form one or more evaporative crystallization branches; each evaporation crystallization branch can share the liquid storage tank and the pre-processor, so that the production cost of equipment is saved, and the liquid storage tank and the pre-processor can be independently configured; the liquid storage tank, the preprocessor and the plurality of low-temperature evaporative crystallization devices are connected in series or in parallel, and adjacent branches are communicated or not communicated; the branch connection mode enables the processing capacity of evaporative crystallization of the whole system to be more flexible, and the evaporative crystallization efficiency on each branch is optimized.
Drawings
The present invention will be further explained with reference to the drawings and examples;
FIG. 1 is a schematic structural diagram of a low-temperature evaporative crystallization apparatus according to a first embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a low-temperature evaporative crystallization apparatus according to a second embodiment of the present invention;
in the figure: 1. a liquid storage tank; 11. stock solution; 12. a first feed pump; 2. a pre-processor; 21. a pretreatment tank; 22. a preheating device; 3. a low-temperature evaporation crystallization device; 31. a low-temperature evaporation crystallization chamber; 311. evaporating the crystallization cavity; 312. a jacket cavity; 32. a negative pressure system; 321. a vacuum pump; 33. a heating device; 34. a second feed pump; 35. an electromagnetic valve.
Detailed Description
The invention will now be described in further detail with reference to the accompanying drawings, which are simplified schematic drawings and illustrate, by way of illustration only, the basic structure of the invention, and which therefore show only the constituents relevant to the invention.
Example one
Fig. 1 is a schematic structural diagram of a low-temperature evaporative crystallization apparatus. The low-temperature evaporation crystallization device comprises: a liquid storage tank 1, a pre-processor 2 and a low-temperature evaporation crystallization device. The liquid storage tank 1, the preprocessor 2 and the low-temperature evaporative crystallization device work cooperatively and form an evaporative crystallization branch.
The stock solution 11 is stored in the stock solution tank 1. The air pressure in the liquid storage tank 1 is normal pressure. The raw liquid 11 includes, but is not limited to, waste water, liquid chemicals, or organic mixed solution, and the liquid thereof mainly needs to be evaporated or purified, and in this embodiment, industrial waste water is preferred.
In this embodiment, the raw liquid 11 may be a liquid that has not been subjected to evaporation treatment, and the temperature is room temperature, generally 5 ℃ to 25 ℃; or the raw liquid 11 in this embodiment may also be a residual concentrated liquid that has been subjected to high-temperature evaporation or low-temperature evaporation processing to reach a specified multiple, and the residual concentrated liquid that has been subjected to high-temperature evaporation or low-temperature evaporation processing to reach a specified multiple may be mixed with the normal-temperature raw liquid 11 and then introduced into the low-temperature evaporative crystallization device 3, or may be directly introduced into the low-temperature evaporative crystallization device 3 alone, and may be controlled by a feed valve or an electromagnetic valve, which is not described herein again.
The stock solution 11 stored in the liquid storage tank 1 is pumped into the pre-processor 2 through the first feeding pump 12, the pre-processor 2 comprises a pre-processing tank 21 and a pre-heating device 22, the pre-processing tank 21 can receive the stock solution 11 pumped into the liquid storage tank 1 by the first feeding pump 12, and the air pressure in the pre-processing tank 21 is normal pressure. The preheating device 22 preheats the stock solution 11 in the pretreatment tank 21, and the heating temperature is controlled to be above 40 ℃. The pretreatment unit 2 in this embodiment is not limited to the above-described structure of the internal coil type volumetric heat exchanger or the external heat exchanger, and mainly heats the raw liquid 11 in the pretreatment tank 21.
It should be noted that the preheating device 22 in this embodiment may be provided separately or together with the heating device 33 in the low-temperature evaporative crystallization device 3.
The raw liquid 11 which has been preheated in the pre-processor 2 is fed to the low-temperature evaporative crystallization apparatus 3. The low-temperature evaporative crystallization device 3 comprises a low-temperature evaporative crystallization chamber 31, a negative pressure system 32 and a heating device 33.
The evaporative crystallization chamber 311 in the inner layer of the low temperature evaporative crystallization chamber 31 is capable of receiving the pre-heated stock solution 11 from the pre-treater 2. The heating device 33 can be an electric auxiliary heating device 33; an external heating device 33 for heating the medium in the jacket cavity 312 wrapped on the outer layer of the low-temperature evaporation crystallization chamber 31 can be selected, the medium in the jacket cavity 312 wrapped on the outer layer of the low-temperature evaporation crystallization chamber 31 can be various heat-conducting media such as gas, liquid or refrigerant, and the temperature of the corresponding medium can be raised through an air compressor, a steam compressor, an internal combustion engine, a gas turbine, a water heater, a heat pump and the like; high-temperature gas or high-temperature liquid can be directly used as a heat conducting medium.
In this embodiment, the low-temperature evaporative crystallization chamber 31 is preferably of a jacket structure, the inner layer of the low-temperature evaporative crystallization chamber 31 is an evaporative crystallization cavity 311, and the side surface of the outer layer of the evaporative crystallization cavity 311 is wrapped by the jacket cavity 312 of the outer layer of the low-temperature evaporative crystallization chamber 31 or the side surface and the bottom surface of the outer layer of the evaporative crystallization cavity 311 are wrapped by the jacket cavity 312 of the outer layer of the low-temperature evaporative crystallization chamber 31. After the gas heat-conducting medium is pressurized and heated by an air compressor or a vapor compressor, the residual concentrated solution in the inner cavity of the low-temperature evaporative crystallization chamber 31 is heated by the high-temperature heat-conducting medium, so that the temperature of the residual concentrated solution in the inner cavity of the low-temperature evaporative crystallization chamber 31 is higher than the temperature required for evaporation in a vacuum state in the low-temperature evaporative crystallization chamber 31 by 35-40 ℃.
The evaporation crystallization cavity 311 is further communicated with a negative pressure system 32, the negative pressure system 32 mainly comprises a vacuum pump 321, and the vacuum pump enables the evaporation crystallization cavity 311 to realize a vacuum environment, so that the boiling point of the residual concentrated solution in the low-temperature evaporation crystallization cavity 311 is reduced. The preheated dope 11 introduced into the evaporative crystallization chamber 311 is evaporated and crystallized in a vacuum and a set low temperature range.
A scraper or a stirring blade is selectively arranged in the evaporation crystallization cavity 311, and the scraper is used for scraping off scaling substances or residues on the inner wall of the evaporation crystallization cavity 311; the stirring paddle is used to stir the concentrated solution to be heated uniformly. The heat transfer area of the evaporator, which is generally provided with the scraper, is limited by the throughput, resulting in a low heat transfer efficiency and a limited heat transfer area, resulting in a low evaporation intensity of the evaporator.
In order to increase the processing capacity of evaporative crystallization, the present embodiment improves the heating area and the heat transfer efficiency of the unit low-temperature evaporative crystallization device 3 on the evaporative crystallization branch, improves the strength of evaporative crystallization, reduces the crystallization processing time, and achieves the increase of the processing capacity of evaporative crystallization by arranging the liquid storage tank 1 and the pre-processor 2 in front of the conventional low-temperature evaporative crystallization device 3 and preheating the raw liquid 11 entering the low-temperature evaporative crystallization device 3 by the pre-processor 2.
Example two
In order to further increase the throughput of evaporative crystallization, the present embodiment is modified based on the first embodiment. As shown in FIG. 2, the number of the low temperature evaporative crystallization devices 3 in the first embodiment is increased to add more evaporative crystallization branches, and a common second feeding pump 34 or a corresponding second feeding pump 34 can be adopted to adapt to the flexible change of the treatment capacity by increasing the number of the solenoid valves 35 of each branch. In the embodiment, the number of the low-temperature evaporative crystallization devices 3 can be set to be a plurality, and the main purpose of the low-temperature evaporative crystallization device is to ensure that the crystallization capacity of each evaporative crystallization branch is maximized. The liquid storage tank 1, the pre-processor 2 and each low-temperature evaporative crystallization device 3 are communicated in series, so that the stock solution 11 preheated in the pre-processor 2 can be flexibly distributed to each evaporative crystallization cavity 311.
Of course, in this embodiment, each evaporation crystallization branch can share the liquid storage tank 1 and the pre-processor 2, so as to save the production cost of the device, and the liquid storage tank 1 and the pre-processor 2 can also be configured separately; and the liquid storage tank 1, the pre-processor 2 and the plurality of low-temperature evaporative crystallization devices 3 are connected in series or in parallel, and adjacent branches are communicated or not communicated.
In addition, because the liquid storage capacity of the liquid storage tank 1 can be larger than, equal to or smaller than the processing capacity of the pre-processor 2, in order to maximize the evaporation crystallization capacity of all evaporation crystallization branches, a plurality of liquid storage tanks 1 or a plurality of pre-processors 2 can be selectively arranged to be connected in series or in parallel, so that the evaporation processing efficiency of the whole equipment is maximized, and the heat loss is reduced.
In this embodiment, the branch connection mode makes the throughput of evaporative crystallization of the whole system more flexible, and optimizes the evaporative crystallization efficiency on each branch.
In the embodiment, the number of the low-temperature evaporative crystallization devices 3 is increased, and the stock solution 11 preheated in the liquid storage tank 1 is evaporated by using a plurality of evaporative crystallization branches, so that the heating area and the heat transfer efficiency of the whole low-temperature evaporative crystallization equipment are improved, the evaporative crystallization strength is improved, the crystallization processing time is reduced, and the processing amount of evaporative crystallization is further improved on the basis of the first embodiment.
When the utility model is used, the stock solution 11 in the liquid storage tank 1 is conveyed into the pretreatment tank 21 through the first feeding pump 12, and the preheating device 22 preheats the stock solution 11 in the pretreatment tank 21; the stock solution 11 which has been preheated in the pre-processor 2 enters one or more low-temperature evaporative crystallization devices 3 to form one or more evaporative crystallization branches; and each evaporation crystallization branch regulates and controls the treatment amount entering each low-temperature evaporation crystallization chamber 31 through a second feeding pump 34 which is commonly arranged or is respectively arranged in each branch and an electromagnetic valve 35 which is respectively arranged in each branch, and the preheated stock solution 11 which is introduced into each evaporation crystallization cavity 311 is evaporated and crystallized in a vacuum and set low-temperature range.
In light of the foregoing, it is to be understood that various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the invention. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. A low temperature evaporative crystallization apparatus, comprising: a liquid storage tank, a preprocessor and a plurality of low-temperature evaporative crystallization devices; the liquid storage tank, the pre-processor and each low-temperature evaporative crystallization device are communicated in series;
stock solution is stored in the liquid storage tank, and the air pressure in the liquid storage tank is normal pressure; the pretreatment device comprises a pretreatment tank and a preheating device, the pretreatment device can receive the stock solution in the liquid storage tank and preheat the stock solution, and the air pressure in the pretreatment tank is normal pressure;
the low-temperature evaporative crystallization device comprises a low-temperature evaporative crystallization chamber, a negative pressure system and a heating device, wherein the low-temperature evaporative crystallization chamber is of a sheath structure, the inner layer of the low-temperature evaporative crystallization chamber is an evaporative crystallization cavity, and the outer side surface of the evaporative crystallization cavity is wrapped by the outer jacket cavity of the low-temperature evaporative crystallization chamber or the outer side surface and the bottom surface of the evaporative crystallization cavity are wrapped by the outer jacket cavity of the low-temperature evaporative crystallization chamber; the evaporation crystallization cavity in the inner layer of the low-temperature evaporation crystallization chamber can receive the stock solution preheated in the pre-processor, the evaporation crystallization cavity is also communicated with the negative pressure system, and the evaporation crystallization cavity is enabled to realize a vacuum environment through the negative pressure system; and the preheated stock solution which is introduced into the evaporation crystallization cavity is evaporated in a vacuum and set low temperature range to form crystals.
2. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: and the stock solution in the stock solution tank is conveyed into the pretreatment tank through a first feeding pump.
3. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: the pretreatment tank in the pretreatment device is internally or externally connected with the preheating device to preheat the stock solution in the pretreatment tank.
4. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: the preheating device in the pre-processor is arranged independently, or the preheating device and the heating device in the low-temperature evaporative crystallization device are arranged together.
5. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: the low-temperature evaporative crystallization device is provided with the negative pressure system, the negative pressure system is provided with a vacuum pump, and the vacuum pump provides a vacuum environment for the evaporative crystallization cavity and reduces the boiling point of liquid in the evaporative crystallization cavity.
6. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: the liquid storage tank, the preprocessor and the low-temperature evaporative crystallization device work in a cooperative mode and are provided with a plurality of evaporative crystallization branches, and the evaporative crystallization branches can share the second feeding pump or are respectively and independently provided with the second feeding pump.
7. A low temperature evaporative crystallization apparatus as defined in claim 6, wherein: the liquid in each evaporation crystallization branch is communicated or not communicated with each other.
8. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: and an electromagnetic valve for adjusting the flow and speed of the fluid is arranged in a pipeline for communicating the pre-processor with the low-temperature evaporative crystallization device.
9. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: and a scraper is arranged in the evaporation crystallization cavity and used for scraping off scaling substances or residues on the inner wall of the evaporation crystallization cavity.
10. A low temperature evaporative crystallization apparatus as defined in claim 1 wherein: the stock solution can be liquid which is not subjected to evaporation treatment, or residual concentrated solution which is subjected to high-temperature evaporation or low-temperature evaporation treatment and reaches a specified multiple.
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| CN202120809625.8U CN215084988U (en) | 2021-04-20 | 2021-04-20 | Low-temperature evaporation crystallization equipment |
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| CN202120809625.8U CN215084988U (en) | 2021-04-20 | 2021-04-20 | Low-temperature evaporation crystallization equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114590856A (en) * | 2022-03-17 | 2022-06-07 | 江苏嘉泰蒸发设备股份有限公司 | Low-temperature multi-effect evaporation crystallization process and crystallization equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114590856A (en) * | 2022-03-17 | 2022-06-07 | 江苏嘉泰蒸发设备股份有限公司 | Low-temperature multi-effect evaporation crystallization process and crystallization equipment |
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