CN214735134U - Energy-conserving evaporation crystal system of MVR - Google Patents
Energy-conserving evaporation crystal system of MVR Download PDFInfo
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- CN214735134U CN214735134U CN202120786482.3U CN202120786482U CN214735134U CN 214735134 U CN214735134 U CN 214735134U CN 202120786482 U CN202120786482 U CN 202120786482U CN 214735134 U CN214735134 U CN 214735134U
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- pump
- falling film
- forced circulation
- evaporator
- separator
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- 238000001704 evaporation Methods 0.000 title claims abstract description 18
- 239000011552 falling film Substances 0.000 claims abstract description 56
- 238000002425 crystallisation Methods 0.000 claims abstract description 46
- 230000005712 crystallization Effects 0.000 claims abstract description 46
- 239000000463 material Substances 0.000 claims abstract description 26
- 239000002994 raw material Substances 0.000 claims abstract description 21
- 239000008258 liquid foam Substances 0.000 claims abstract description 20
- 239000012153 distilled water Substances 0.000 claims abstract description 19
- 238000010438 heat treatment Methods 0.000 claims abstract description 14
- 239000012452 mother liquor Substances 0.000 claims abstract description 14
- 239000002562 thickening agent Substances 0.000 claims abstract description 13
- 239000007788 liquid Substances 0.000 claims description 50
- 150000003839 salts Chemical class 0.000 claims description 13
- 239000011780 sodium chloride Substances 0.000 claims description 13
- 238000007599 discharging Methods 0.000 claims description 6
- 238000004821 distillation Methods 0.000 abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 3
- 239000002351 wastewater Substances 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- RAHZWNYVWXNFOC-UHFFFAOYSA-N sulphur dioxide Chemical compound O=S=O RAHZWNYVWXNFOC-UHFFFAOYSA-N 0.000 description 2
- 238000003911 water pollution Methods 0.000 description 2
- 235000013361 beverage Nutrition 0.000 description 1
- 238000002306 biochemical method Methods 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005039 chemical industry Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000004059 degradation Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000010612 desalination reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006011 modification reaction Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000004065 wastewater treatment Methods 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
An energy-conserving evaporation crystallization system of MVR, its characterized in that: comprises a raw material tank, a feeding pump, a preheating plate exchanger, a falling film circulating pump, a falling film material transferring pump, a falling film evaporator, a steam compressor, a liquid foam separator, a distilled water conveying pump and a distilled water tank, the system comprises a forced circulation evaporator, a crystallization separator, a forced circulation pump, a discharge pump, a thickener, a centrifugal machine, a mother liquor heating tank and a mother liquor delivery pump, wherein the feed pump is connected with a raw material tank, the falling film evaporator is connected with a falling film transfer pump, the outlet of a liquid foam separator is connected with the inlet of a vapor compressor, the outlet of the vapor compressor enters the falling film evaporator and the vapor inlet of the forced circulation evaporator, the crystallization separator is connected with the thickener through the discharge pump, the thickener is connected with the centrifugal machine, centrifugal mother liquor enters the mother liquor heating tank, the mother liquor delivery pump delivers the mother liquor to the forced circulation evaporator, condensate on the lower parts of the falling film evaporator and the forced circulation evaporator enters a distillation water tank, and the distilled water delivery pump delivers the condensate to a preheating plate and then is discharged out of the system.
Description
Technical Field
The utility model relates to a MVR evaporation crystallization technical field relates to an energy-conserving evaporation crystallization system of MVR particularly.
Background
MVR is a short for mechanical vapor recompression technology, is widely used in the industries of chemical industry, pharmacy, food, beverage, environmental protection and the like, is an energy-saving technology which utilizes secondary vapor and energy thereof generated by an evaporation system to lift low-grade vapor into high-grade vapor heat source through mechanical work of a compressor, so that the circulating evaporation system provides heat energy for the system, thereby reducing the requirements on other external energy sources.
With the continuous improvement of the industrial level in China, the demand of water resources is increasing day by day, however, the water pollution problem in China is not fundamentally treated, but gradually aggravated. This leads to that the pressure of water pollution control will be more prominent in the future period in China with scarce water resources. At present, industrial sewage treatment methods are various, wherein a distillation method is widely applied due to high technical level and remarkable treatment effect. However, a coal-fired boiler is required to provide a large amount of power steam in the operation process of the distillation method, so that the problems of low heat efficiency, high power consumption, high operation cost, resource waste and the like of the traditional evaporator exist, and the combustion of coal in the boiler is accompanied with the generation of harmful gases such as carbon dioxide, sulfur dioxide and the like, so that a lot of adverse effects are brought to the production development. In recent years, as a novel evaporation device, an MVR evaporator is generally popular because the technology, the principle and the mode of the traditional evaporation system are thoroughly changed, various heat losses in the system are fully reduced, and various effective heat energies are utilized.
In order to solve the problems that in actual production in many areas, no steam heat source exists, but the salt content of wastewater exceeds the tolerance degree of an activated sludge process, or the wastewater is not high in salt content, has organic toxicity and is not suitable for degradation by a biochemical method, an evaporative crystallization desalination technology is needed, and MVR energy-saving evaporation can just solve the problems.
Disclosure of Invention
An energy-conserving evaporation crystallization system of MVR, its characterized in that: the device comprises a raw material tank, a feed pump, a preheating plate exchanger, a falling film circulating pump, a falling film material transferring pump, a falling film evaporator, a steam compressor, a liquid foam separator, a distilled water conveying pump, a distilled water tank, a forced circulation evaporator, a crystallization separator, a forced circulation pump, a discharge pump, a thickener, a centrifuge, a mother liquor heating tank and a mother liquor conveying pump, wherein the inlet of the feed pump is connected with the raw material tank, the outlet of the feed pump is connected with the raw material inlet of the preheating plate exchanger, the bottom of the thin liquid side of the falling film evaporator is connected with the falling film circulating pump, the bottom of the thick liquid side of the falling film evaporator is connected with the falling film material transferring pump, the lower end of the falling film evaporator is connected with the liquid foam separator, the outlet of the liquid foam separator is connected with the inlet of a steam compressor, the outlets of the steam compressor respectively enter the steam inlet of the falling film evaporator and the steam inlet of the forced circulation evaporator, the falling film material transferring pump is connected with the forced circulation evaporator, the crystallization separator is connected with the forced circulation evaporator in series, the forced circulation pump is characterized in that an inlet of the forced circulation pump is connected with a crystallization separator, an outlet of the forced circulation pump is connected with a forced circulation evaporator, a thick material at the bottom of the crystallization separator is connected with a thickener through a discharging pump, the thickener is connected with a centrifugal machine in a discharging mode, centrifugal mother liquid of the centrifugal machine enters a mother liquid heating tank, a mother liquid conveying pump conveys the thick material of the mother liquid heating tank to the forced circulation evaporator, an upper steam port of the crystallization separator is connected with a liquid foam separator, condensate at the lower parts of the falling film evaporator and the forced circulation evaporator enters a distilled water tank, and the distilled water conveying pump conveys the condensate to a preheating plate and then to be discharged out of the system.
In some preferred embodiments, the raw material tank is provided with a liquid level sensor for controlling the starting and stopping of the raw material pump.
In some preferable embodiments, the upper part of the falling-film evaporator is provided with a liquid distribution device.
In some preferred embodiments, the upper part of the crystallization separator is provided with a baffle demister.
In some preferred embodiments, the crystallization separator is provided with a liquid level sensor for controlling the start and stop of the falling film material transfer pump.
In some preferred embodiments, the bottom of the crystallization separator is provided with a salt leg with a crystal growth function, and the salt leg is in a conical structure.
In some preferred embodiments, a swirl plate demister or a wire mesh demister is arranged inside the liquid-foam separator.
In some preferred embodiments, the centrifuge may be a spiral screen centrifuge, a plate unloading centrifuge, or a dual-stage pusher centrifuge.
Drawings
The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.
FIG. 1 is a schematic flow diagram of an energy-saving evaporative crystallization system of MVR of the present invention;
wherein, 1 raw material tank, 2 charge pumps, 3 preheating plate exchange, 4 falling film circulating pumps, 5 falling film material transfer pumps, 6 falling film evaporators, 7 steam compressors, 8 liquid foam separators, 9 distilled water delivery pumps, 10 distilled water tanks, 11 forced circulation evaporators, 12 crystallization separators, 13 forced circulation pumps, 14 discharge pumps, 15 thickeners, 16 centrifuges, 17 mother liquor heating tanks and 18 mother liquor delivery pumps.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the accompanying drawings and the embodiments.
The utility model discloses a process to waste water treatment as follows:
an energy-conserving evaporation crystallization system of MVR, its characterized in that: comprises a raw material tank (1), a feed pump (2), a preheating plate exchanger (3), a falling film circulating pump (4), a falling film material transfer pump (5), a falling film evaporator (6), a steam compressor (7), a liquid foam separator (8), a distilled water conveying pump (9), a distilled water tank (10), a forced circulation evaporator (11), a crystallization separator (12), a forced circulation pump (13), a discharge pump (14), a thickener (15), a centrifuge (16), a mother liquor heating tank (17) and a mother liquor conveying pump (18), wherein the inlet of the feed pump (2) is connected with the raw material tank (1), the outlet of the feed pump (2) is connected with the raw material inlet of the preheating plate exchanger (3), the bottom of the thin liquid side of the falling film evaporator (6) is connected with the falling film circulating pump (4), the bottom of the thick liquid side of the falling film evaporator (6) is connected with the falling film material transfer pump (5), the lower end of the falling film evaporator (6) is connected with the liquid foam separator (8), the outlet of the liquid-foam separator (8) is connected with the inlet of a steam compressor (7), the outlet of the steam compressor (7) is respectively connected with the steam inlets of a falling film evaporator (6) and a forced circulation evaporator (11), the falling film material transferring pump (5) is connected with the forced circulation evaporator (11), the crystallization separator (12) is connected with the forced circulation evaporator (11) in series, the inlet of a forced circulation pump (13) is connected with the crystallization separator (12), the outlet of the forced circulation pump (13) is connected with the forced circulation evaporator (11), the thick material at the bottom of the crystallization separator (12) is connected with a thick material device (15) through a discharging pump (14), the thick material device (15) is discharged and connected with a centrifugal machine (16), the centrifugal machine (16) centrifugalizes the mother liquid into a mother liquid heating tank (17), and the mother liquid conveying pump (18) conveys the thick material in the mother liquid heating tank (17) to the forced circulation evaporator (11), the upper steam port of the crystallization separator (12) is connected to the liquid foam separator (8), condensate at the lower parts of the falling-film evaporator (6) and the forced circulation evaporator (11) enters a distilled water tank (10), and the distilled water conveying pump (9) conveys the condensate to the preheating plate to be exchanged (3) and then to be discharged out of the system.
Further, the head tank is equipped with level sensor, controls opening of feedstock pump and stops.
Further, the upper part of the falling film evaporator is provided with a liquid distribution device.
Furthermore, a baffle demister is arranged at the upper part of the crystallization separator.
Furthermore, the crystallization separator is provided with a liquid level sensor for controlling the start and stop of the falling film material transferring pump.
Furthermore, the bottom of the crystallization separator is provided with a salt leg with a crystal growing function, and the salt leg is in a conical structure.
Furthermore, a rotational flow plate demister or a wire mesh demister is arranged in the liquid-foam separator.
Further, the centrifuge can adopt a spiral screen centrifuge, a flat plate unloading centrifuge or a double-stage piston pusher centrifuge and the like.
Specifically, wastewater is firstly conveyed to a raw material tank (1) through a pipeline, a liquid level sensor of the raw material tank (1) can control the start and stop of an automatic valve on a feeding pipeline so as to keep the liquid level of the raw material tank (1) stable, a raw material pump (2) conveys the material to an MVR evaporator, the raw material is preheated by a preheating plate exchanger (3) to recover the waste heat of evaporated condensate, the raw material firstly enters a liquid distributor on the upper part of a falling-film evaporator (6), the liquid falls into a thin liquid side on the lower part of the falling-film evaporator (6) after primary heat exchange is carried out on the liquid and steam through a heat exchange pipe, a falling-film circulating pump (4) continuously conveys the liquid on the thin liquid side to the liquid distributor on the upper part of the falling-film evaporator (6), the liquid falls into a thick liquid side on the lower part of the falling-film evaporator (6) after secondary heat exchange is carried out on the liquid and steam through the heat exchange pipe, the falling-film material transferring pump (5) conveys the liquid on the thick liquid side to a forced circulation evaporator (11) for continuous evaporation and concentration, the forced circulation evaporator (11), the crystallization separator (12) and the forced circulation pump (13) are connected in series for circulation evaporation, inorganic salt precipitated from the feed liquid reaching the saturated concentration enters a salt leg with a crystal growth function arranged at the bottom of the crystallization separator (12), the salt leg is pumped into the thickener (15) through a discharge pump (14) to continuously increase the solid-to-liquid ratio, clear liquid at the upper part of the thickener (15) overflows into a mother liquid heating tank (17), when the crystallized salt in the thickener (15) reaches the set solid-to-liquid ratio, a centrifugal machine (16) is started to separate the inorganic salt, centrifugal mother liquid continuously enters the mother liquid heating tank (17) to be heated, the mother liquid is conveyed into the forced circulation evaporator (11) through a mother liquid conveying pump (18) to be continuously evaporated, secondary steam at the upper part enters the crystallization separator (12) and passes through the upper part of the crystallization separator (12) under the suction action of a steam compressor (7) to be provided with a baffle demister to primarily remove large liquid drops in the secondary steam, continuously enters a liquid foam separator (8) to fully separate liquid foam in secondary steam, then is mechanically lifted into a high-grade steam heat source through a steam compressor (7), and then respectively enters a falling film evaporator (6) and a forced circulation evaporator (11) to exchange heat with materials to form a completed evaporation cycle, evaporation condensate is collected to a distilled water tank (10) to reach the liquid level and then is conveyed to a preheating plate (3) through a distilled water conveying pump (9) to exchange heat with raw materials, and then is discharged out of an evaporation system.
The above is only the preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, many variations and modifications can be made without departing from the inventive concept, and these all fall into the protection scope of the present invention.
Claims (8)
1. An energy-conserving evaporation crystallization system of MVR, its characterized in that: the device comprises a raw material tank, a feed pump, a preheating plate exchanger, a falling film circulating pump, a falling film material transferring pump, a falling film evaporator, a steam compressor, a liquid foam separator, a distilled water conveying pump, a distilled water tank, a forced circulation evaporator, a crystallization separator, a forced circulation pump, a discharge pump, a thickener, a centrifuge, a mother liquor heating tank and a mother liquor conveying pump, wherein the inlet of the feed pump is connected with the raw material tank, the outlet of the feed pump is connected with the raw material inlet of the preheating plate exchanger, the bottom of the thin liquid side of the falling film evaporator is connected with the falling film circulating pump, the bottom of the thick liquid side of the falling film evaporator is connected with the falling film material transferring pump, the lower end of the falling film evaporator is connected with the liquid foam separator, the outlet of the liquid foam separator is connected with the inlet of a steam compressor, the outlets of the steam compressor respectively enter the steam inlet of the falling film evaporator and the steam inlet of the forced circulation evaporator, the falling film material transferring pump is connected with the forced circulation evaporator, the crystallization separator is connected with the forced circulation evaporator, the crystallization separator is connected with the forced circulation evaporator in series, the forced circulation evaporator is connected with the outlet of the forced circulation pump, the thick material at the bottom of the crystallization separator is connected with the thickener through the discharging pump, the thick material is connected with the centrifugal machine in a discharging mode, the centrifugal machine centrifugalizes the mother liquid to enter the mother liquid heating tank, the mother liquid conveying pump conveys the thick material in the mother liquid heating tank to the forced circulation evaporator, the upper steam port of the crystallization separator is connected with the liquid foam separator, the condensate at the lower parts of the falling-film evaporator and the forced circulation evaporator enters the distilled water tank, and the distilled water conveying pump conveys the condensate to the preheating plate and then to the system.
2. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: the head tank is equipped with level sensor, controls opening of feedstock pump and stops.
3. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: and the upper part of the falling film evaporator is provided with a liquid distribution device.
4. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: and the upper part of the crystallization separator is provided with a baffle demister.
5. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: the crystallization separator is provided with a liquid level sensor for controlling the start and stop of the falling film material transferring pump.
6. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: the bottom of the crystallization separator is provided with a salt leg with a crystal growing function, and the salt leg is of a conical structure.
7. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: and a rotational flow plate demister or a wire mesh demister is arranged in the liquid-foam separator.
8. The MVR energy-saving evaporative crystallization system according to claim 1, wherein: the centrifuge can adopt a spiral screen centrifuge, a flat plate lower discharging centrifuge or a double-stage piston pusher centrifuge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120786482.3U CN214735134U (en) | 2021-04-17 | 2021-04-17 | Energy-conserving evaporation crystal system of MVR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120786482.3U CN214735134U (en) | 2021-04-17 | 2021-04-17 | Energy-conserving evaporation crystal system of MVR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214735134U true CN214735134U (en) | 2021-11-16 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120786482.3U Active CN214735134U (en) | 2021-04-17 | 2021-04-17 | Energy-conserving evaporation crystal system of MVR |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN214735134U (en) |
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2021
- 2021-04-17 CN CN202120786482.3U patent/CN214735134U/en active Active
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