CN105879426A - MVR continuous evaporative crystallization system - Google Patents
MVR continuous evaporative crystallization system Download PDFInfo
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- CN105879426A CN105879426A CN201610375197.6A CN201610375197A CN105879426A CN 105879426 A CN105879426 A CN 105879426A CN 201610375197 A CN201610375197 A CN 201610375197A CN 105879426 A CN105879426 A CN 105879426A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0018—Evaporation of components of the mixture to be separated
- B01D9/0031—Evaporation of components of the mixture to be separated by heating
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/0094—Evaporating with forced circulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/30—Accessories for evaporators ; Constructional details thereof
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0059—General arrangements of crystallisation plant, e.g. flow sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0063—Control or regulation
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/02—Crystallisation from solutions
- B01D9/04—Crystallisation from solutions concentrating solutions by removing frozen solvent therefrom
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Crystallography & Structural Chemistry (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Vaporization, Distillation, Condensation, Sublimation, And Cold Traps (AREA)
Abstract
The invention relates to a MVR continuous evaporative crystallization system which comprises a heating system, an evaporative crystallization system, a crystallization separation system and a condensation system. The heating system comprises a live steam compensation pipeline, a steam compressor and a material preheating device. The evaporative crystallization system comprises a circulation evaporator and a crystallizer. The crystallization separation system comprises a centrifugal machine. The condensation system comprises a condensate collection tank. The circulation evaporator comprises is connected with the condensate collection tank through a condensate water inlet pipe. The material preheating device comprises a primary preheater, a secondary preheater and a tertiary preheater. A second branch pipe, used for conveying live steam, connected to the steam compressor is connected into the tertiary preheater. The condensate collection tank is connected with the secondary preheater through a condensate water outlet pipe. The condensate collection tank is connected with the primary preheater through a non-condensation gas pipe. A non-condensation gas outlet of the primary preheater is connected with a vacuum pump. The MVR continuous evaporative crystallization system has the advantages of being high in heat utilization rate, good in energy-saving performance, low in pollution, high in efficiency and stable in work.
Description
Technical field
The present invention relates to evaporation and crystallization system, be specifically MVR continuous evaporative crystallization system.
Background technology
Function of mechanical steam recompression Mechanical Vapor
Recompression technology is a kind of high-efficient energy-saving environment friendly technology, is called for short MVR.Although prior art discloses a lot of MVR continuous evaporative crystallization system using mechanical vapor recompression technology, but it not the most that it is enough in the application of technical grade.
Industrial material and industrial wastewater are through frequently with evaporating and concentrating process, and steam consumption is high.In evaporation technique, the form evaporator of multiple-effect evaporation uses the most universal.But in recent years, along with the rise at full speed of steam price, the energy consumption of this kind of evaporation process also makes vast business burden be increased dramatically.Indirect steam mostly just is compressed utilizing potential by existing MVR evaporation and crystallization system, and it is simply for a portion for the whole evaporation and crystallization system discharge energy, the discharge energy in whole system is still underutilized, such as the fixed gas produced in evaporation, condensed water etc., not only cause the waste of the energy, and cause the pollution of environment.Along with country is the strictest to the requirement of energy-saving and emission-reduction, and the requirement of enterprise's self-growth, energy utilization rate bigger in evaporation and crystallization system becomes the target that enterprise is constantly pursued.
Summary of the invention
Objects of the present invention: for the defect overcoming prior art to exist, the present invention provides a kind of heat utilization ratio high, and energy-efficient performance is good, the MVR continuous evaporative crystallization system that pollution is less, efficiency is high, has the advantage that system is stable and reliable in work.
For achieving the above object, the technical scheme is that
nullA kind of MVR continuous evaporative crystallization system，Including heating system、Evaporation and crystallization system、Crystallization Separation system and condenser system，Described heating system includes raw steam compensation conduit、Vapour compression machine and material preheating device，Described evaporation and crystallization system includes circulating evaporator and crystallizer，Circulating evaporator and crystallizer all connect vapour compression machine through secondary steam pipe，The outlet of vapour compression machine is delivered a child steam pipe，Raw steam pipe connects the first arm accessing circulating evaporator and the second arm connecing material preheating device，First arm and the second arm connect raw steam compensation conduit，Crystallizer connects feeding pipe，Circulating evaporator top is connected through return pipeline with crystallizer，It is connected through materail tube with crystallizer bottom circulating evaporator，Materail tube is provided with circulating pump，Crystallization Separation system includes centrifuge，Centrifuge is connected with the bottom conduit of crystallizer，Pipeline between centrifuge and crystallizer is provided with magma pump，Described condenser system includes lime set collecting tank，Circulating evaporator condensed water inlet pipe connects lime set collecting tank，It is characterized in that: described material preheating device includes the one-level preheater being sequentially arranged、Two grades of preheaters and three grades of preheaters，Feeding pipe sequentially passes through one-level preheater、Two grades of preheaters and three grades of preheaters，Described second arm connects three grades of preheaters，The described condensed water of lime set collecting tank goes out pipe and connects two grades of preheaters，Lime set collecting tank connects one-level preheater through fixed gas pipe，The fixed gas outlet connection of one-level preheater has vacuum pump.
nullBy using technique scheme，Material is through one-level preheater、Two grades of preheaters and three grades of preheaters carry out stepped heating and reach design temperature，Crystallize in entering evaporation and crystallization system afterwards，Material evaporation crystallization process is carried out when total enclosing，Temperature in equipment、Pressure and feed concentration are all positively retained at the state being most appropriate to evaporation，Require that being pumped to centrifuge by magma is centrifuged obtaining crystal when magma solid-to-liquid ratio reaches design，The raw steam compensation conduit of heating system supplements as the raw steam in system and is used，The indirect steam produced in evaporation and crystallization system improves its pressure and saturation temperature after vapour compression machine compresses，Increase enthalpy，It is re-fed into vaporizer and maintains evaporating temperature as thermal source，And in sending into three grades of preheaters, material is preheated，Owing to the latent heat of indirect steam is fully used，Reach energy-conservation purpose；And material is preheated in respectively leading to two grades of preheaters, one-level preheater by condensed water in lime set collecting tank and fixed gas as thermal source, it is effectively utilized the heat of condensed water and fixed gas, thus reach energy-conservation purpose, one-level preheater, two grades of preheaters and the layout of three grades of preheaters, can reach the system discharge energy is made full use of, and material is realized stable effective heating so that system stability high-efficiency operation.
Preferably, the top of described feeding pipe connects to be had by batch can and feed pump, is connected feed pump by the outlet of batch can, and the liquid outlet of described centrifuge connects mother solution surge tank, the outlet of mother solution surge tank connects mother solution feed back pump, and mother solution feed back pump connects by batch can through mother liquor reflux pipe.
Technique scheme designs, realized collection and the buffering of raw material by batch can so that it is more stable that material enters system, and mother solution obtains backflow storage, whole system is discharged without mother solution, reach environmental protection and efficiently, and mother solution mixes with stock solution, with partial heat in mother solution, upon mixing, improve and enter intrasystem material temperature, thus reach energy-conservation purpose, and improve system temperature high-efficiency operation.
Preferably, also include accident emergency system, accident emergency system includes emergent accident pond, underground, emergent accident pond, underground first pipe of meeting an urgent need connects the materail tube being connected bottom circulating evaporator with crystallizer, emergent accident pond, underground second is met an urgent need on the pipeline that pipe is connected on the pipeline of magma pump and crystalliser feet and is connected between mother solution surge tank and mother solution feed back pump, and the first emergent pipe and second is met an urgent need and is provided with controlling valve on pipe.
Technique scheme designs, and is effectively improved the safety of System Operation.
Preferably, being provided with magma surge tank in the pipeline between described centrifuge and magma pump, magma surge tank is configured with agitator.
Technique scheme designs so that store the collection of magma, and joins agitator and make the magma entering centrifuge uniform, it is ensured that reliable operation.
Preferably, described crystallizer is provided with Level Detection pipe, Level Detection pipe two ends connect the upper and lower of crystallizer respectively, Level Detection pipe is provided with level monitoring device, it is provided with inlet control valve between described feeding pipe and crystallizer, level monitoring device is connected with feed control valve signal, and when in crystallizer, material liquid level arrives setting value, level monitoring device controls inlet control valve closedown and stops charging.
Technique scheme designs so that material charging is safe and reliable.
Preferably, described one-level preheater, two grades of preheaters and three grades of preheaters are floating head tubular heat exchanger.
Technique scheme designs, and has heat transfer efficiency high, the advantages such as floor space is little, and equipment price is low.
Preferably, described circulating evaporator is provided with the fixed gas capillary loop for vapours exchange connecting its upper and lower, is connected and has fixed gas ramuscule pipe between fixed gas capillary loop with lime set collecting tank.
Technique scheme designs so that vapours circulates in circulating evaporator, effectively prevents vapours from cooling down result in blockage pipeline and vaporizer too early.
The invention will be further described below in conjunction with the accompanying drawings.
Accompanying drawing explanation
Fig. 1 is specific embodiment of the invention MVR continuous evaporative crystallization system structure schematic diagram.
Detailed description of the invention
See accompanying drawing 1, a kind of MVR continuous evaporative crystallization system disclosed by the invention, including heating system, evaporation and crystallization system, Crystallization Separation system and condenser system, described heating system includes raw steam compensation conduit 1, vapour compression machine 2 and material preheating device, described evaporation and crystallization system includes circulating evaporator 31 and crystallizer 32, circulating evaporator 31 and crystallizer 32 are all through secondary steam pipe 311, 321 connect vapour compression machine 2, vapour compression machine 2 improves its pressure and saturation temperature after compressing indirect steam, increase enthalpy, the indirect steam that circulating evaporator and crystallizer are produced is utilized effectively, reach energy-conservation purpose；The outlet of vapour compression machine 2 is delivered a child steam pipe 21, raw steam pipe 21 connects the first arm 211 accessing circulating evaporator 31 and the second arm 212 connecing material preheating device, first arm 211 and the second arm 212 connect raw steam compensation conduit 1, the raw steam that vapour compression machine produces maintains as thermal source in entering system, described material preheating device includes 41, two grades of preheaters 42 of one-level preheater of being sequentially arranged and three grades of preheaters 43, and described second arm 212 connects three grades of preheaters 43 and realizes the heating of the later stage to material；Crystallizer 32 connects feeding pipe 5, feeding pipe 5 sequentially passes through 41, two grades of preheaters 42 of one-level preheater and three grades of preheaters 43, circulating evaporator 31 top is connected through return pipeline 34 with crystallizer 32, it is connected through materail tube with crystallizer 32 bottom circulating evaporator 31, materail tube is provided with circulating pump 35, Crystallization Separation system includes that centrifuge 71, centrifuge 71 are connected with the bottom conduit of crystallizer 32, is provided with magma pump 70 in the pipeline between centrifuge 71 and crystallizer 32；Described condenser system includes lime set collecting tank 61, circulating evaporator 31 condensed water inlet pipe 611 connects lime set collecting tank 61, the described condensed water of lime set collecting tank 61 goes out pipe 612 and connects two grades of preheaters 42, condensed water goes out to set condensate pump 64 on pipe 612, lime set collecting tank 61 connects one-level preheater 41 through fixed gas pipe 613, and the fixed gas outlet connection of one-level preheater 41 has vacuum pump 62.Vacuum pump 62 uses water ring vacuum pump, has the advantages such as air-breathing is uniform, stable working is reliable, simple to operate, easy to maintenance.nullIn the evaporation and crystallization system of the invention, material is through one-level preheater、Two grades of preheaters and three grades of preheaters carry out stepped heating and reach design temperature，Crystallize in entering evaporation and crystallization system afterwards，Material evaporation crystallization process is carried out when total enclosing，Temperature in equipment、Pressure and feed concentration are all positively retained at the state being most appropriate to evaporation，Require that being pumped to centrifuge by magma is centrifuged obtaining crystal when magma solid-to-liquid ratio reaches design，The raw steam compensation conduit of heating system supplements as the raw steam in system and is used，The indirect steam produced in evaporation and crystallization system improves its pressure and saturation temperature after vapour compression machine compresses，Increase enthalpy，It is re-fed into vaporizer and maintains evaporating temperature as thermal source，And in sending into three grades of preheaters, material is preheated，Owing to the latent heat of indirect steam is fully used，Reach energy-conservation purpose；And material is preheated in respectively leading to two grades of preheaters, one-level preheater by condensed water in lime set collecting tank and fixed gas as thermal source, it is effectively utilized the heat of condensed water and fixed gas, thus reach energy-conservation purpose, one-level preheater, two grades of preheaters and the layout of three grades of preheaters, can reach the system discharge energy is made full use of, and material is realized stable effective heating so that system stability high-efficiency operation.Wherein, 41, two grades of preheaters 42 of described one-level preheater and three grades of preheaters 43 are floating head tubular heat exchanger.Described circulating evaporator 31 is provided with the fixed gas capillary loop 313 for vapours exchange connecting its upper and lower, being connected between fixed gas capillary loop 313 with lime set collecting tank 61 and have fixed gas ramuscule pipe 614, fixed gas capillary loop 313 connects and is equipped with stop valve 3131 on node two lateral line of fixed gas ramuscule pipe 614.In making circulating evaporator 31, vapours is circulated, and prevents the cooling that vapours is too early, and causes blocking pipeline and vaporizer, improves work efficiency and vapours utilization rate simultaneously.
In this specific embodiment, the top of described feeding pipe 5 connects to be had by batch can 51 and feed pump 52, stored for raw material entrance by batch can 51, feed pump 52 is connected by the outlet of batch can 51, the liquid outlet of described centrifuge 71 connects mother solution surge tank 72, the outlet of mother solution surge tank 72 connects mother solution feed back pump 73, and mother solution feed back pump 73 connects by batch can 51 through mother liquor reflux pipe.Collection and the buffering of raw material is realized by batch can, material is made to enter system more stable, and mother solution obtains backflow storage, whole system is discharged without mother solution, reaches environmental protection with efficient, and mother solution mixes with stock solution, with partial heat in mother solution, upon mixing, the intrasystem material temperature of entrance is improved, thus reach energy-conservation purpose, and improve system temperature high-efficiency operation.
For improving the safety of whole system, correspondence system accident has good emergency capability.Also include accident emergency system, accident emergency system includes emergent accident pond, underground 81, emergent accident pond, underground 81 connects, through the first pipe 82 of meeting an urgent need, the materail tube being connected bottom circulating evaporator 31 with crystallizer 32, emergent accident pond, underground 81 is connected on the pipeline bottom magma pump 70 and crystallizer 32 through the second pipe 83 of meeting an urgent need and is connected on the pipeline between mother solution surge tank 72 and mother solution feed back pump 73, and the first pipe 82 and second of meeting an urgent need is met an urgent need and is provided with controlling valve 84,85,86 on pipe 83.When system malfunctions, can discharge it in the accident pool of underground, be effectively improved the safety of System Operation.
It addition, be provided with magma surge tank 74 in pipeline between described centrifuge 71 and magma pump 70, magma surge tank 74 is configured with agitator 741.Collection to magma is stored, and join agitator make enter centrifuge magma uniform, it is ensured that reliable operation.
For ease of controlling charging, described crystallizer 32 is provided with Level Detection pipe 323, Level Detection pipe 323 two ends connect the upper and lower of crystallizer 32 respectively, Level Detection pipe 323 is provided with level monitoring device 324, it is provided with inlet control valve 325 between described feeding pipe 5 and crystallizer 32, level monitoring device 324 is connected with inlet control valve 325 signal, and when in crystallizer 32, material liquid level arrives setting value, level monitoring fills 324 and puts control inlet control valve 325 closedown stopping charging.Level monitoring device includes liquid level sensor and controller, liquid level sensor monitoring liquid level, controller controls inlet control valve according to the signal of liquid level sensor, setting value is reached in liquid level, control inlet control valve closedown thus end charging, being not up to setting value in liquid level, inlet control valve opens charging.Level monitoring mode mainly has gas electric type, float-type, pressure type, radar type, and these are several, the most more advanced for radar type level gauging mode.The effect monitored in real time can be reached.The most most notable radar level gauge belonging to VEGA company of Germany, liquid level sensor and controller thereof can buy the most from the market, for existing equipment, therefore does not repeats its concrete structure.
Claims (7)
- null1. a MVR continuous evaporative crystallization system，Including heating system、Evaporation and crystallization system、Crystallization Separation system and condenser system，Described heating system includes raw steam compensation conduit、Vapour compression machine and material preheating device，Described evaporation and crystallization system includes circulating evaporator and crystallizer，Circulating evaporator and crystallizer all connect vapour compression machine through secondary steam pipe，The outlet of vapour compression machine is delivered a child steam pipe，Raw steam pipe connects the first arm accessing circulating evaporator and the second arm connecing material preheating device，First arm and the second arm connect raw steam compensation conduit，Crystallizer connects feeding pipe，Circulating evaporator top is connected through return pipeline with crystallizer，It is connected through materail tube with crystallizer bottom circulating evaporator，Materail tube is provided with circulating pump，Crystallization Separation system includes centrifuge，Centrifuge is connected with the bottom conduit of crystallizer，Pipeline between centrifuge and crystallizer is provided with magma pump，Described condenser system includes lime set collecting tank，Circulating evaporator condensed water inlet pipe connects lime set collecting tank，It is characterized in that: described material preheating device includes the one-level preheater being sequentially arranged、Two grades of preheaters and three grades of preheaters，Feeding pipe sequentially passes through one-level preheater、Two grades of preheaters and three grades of preheaters，Described second arm connects three grades of preheaters，The described condensed water of lime set collecting tank goes out pipe and connects two grades of preheaters，Lime set collecting tank connects one-level preheater through fixed gas pipe，The fixed gas outlet connection of one-level preheater has vacuum pump.
- MVR continuous evaporative crystallization system the most according to claim 1, it is characterized in that: the top of described feeding pipe connects to be had by batch can and feed pump, feed pump is connected by the outlet of batch can, the liquid outlet of described centrifuge connects mother solution surge tank, the outlet of mother solution surge tank connects mother solution feed back pump, and mother solution feed back pump connects by batch can through mother liquor reflux pipe.
- MVR continuous evaporative crystallization system the most according to claim 2, it is characterized in that: also include accident emergency system, accident emergency system includes emergent accident pond, underground, emergent accident pond, underground first pipe of meeting an urgent need connects the materail tube being connected bottom circulating evaporator with crystallizer, emergent accident pond, underground second is met an urgent need on the pipeline that pipe is connected on the pipeline of magma pump and crystalliser feet and is connected between mother solution surge tank and mother solution feed back pump, and the first emergent pipe and second is met an urgent need and is provided with controlling valve on pipe.
- 4. according to MVR continuous evaporative crystallization system described in claim 1 or 2 or 3, it is characterised in that: being provided with magma surge tank in the pipeline between described centrifuge and magma pump, magma surge tank is configured with agitator.
- 5. according to MVR continuous evaporative crystallization system described in claim 1 or 2 or 3, it is characterized in that: described crystallizer is provided with Level Detection pipe, Level Detection pipe two ends connect the upper and lower of crystallizer respectively, Level Detection pipe is provided with level monitoring device, it is provided with inlet control valve between described feeding pipe and crystallizer, level monitoring device is connected with feed control valve signal, and when in crystallizer, material liquid level arrives setting value, level monitoring device controls inlet control valve closedown and stops charging.
- 6. according to MVR continuous evaporative crystallization system described in claim 1 or 2 or 3, it is characterised in that: described one-level preheater, two grades of preheaters and three grades of preheaters are floating head tubular heat exchanger.
- 7. according to MVR continuous evaporative crystallization system described in claim 1 or 2 or 3, it is characterized in that: described circulating evaporator is provided with the fixed gas capillary loop for vapours exchange connecting its upper and lower, is connected and has fixed gas ramuscule pipe between fixed gas capillary loop with lime set collecting tank.
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| CN201610375197.6A CN105879426A (en) | 2016-05-31 | 2016-05-31 | MVR continuous evaporative crystallization system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108187353A (en) * | 2018-02-12 | 2018-06-22 | 南京高源环保工程有限公司 | A kind of MVR systems of the evaporator of detachable horizontal containing self-cleaning |
| CN109022625A (en) * | 2018-09-18 | 2018-12-18 | 上海立足生物科技有限公司 | A method of producing the D-Psicose of concentration |
| CN109534881A (en) * | 2018-12-28 | 2019-03-29 | 扬州大学 | It is a kind of to utilize the device and method for preparing slow release fertilizer in fuel ash with waste liquid |
| CN109753011A (en) * | 2019-01-17 | 2019-05-14 | 湖州惠鹏达节能环保科技有限公司 | A kind of evaporative crystallization robot control system(RCS) with warning function |
| CN114199065A (en) * | 2021-11-29 | 2022-03-18 | 北京微焓科技有限公司 | Condensation waste heat recovery system |
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| CN114199065A (en) * | 2021-11-29 | 2022-03-18 | 北京微焓科技有限公司 | Condensation waste heat recovery system |
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