CN105854339A - MVR (mechanical vapor recompression) evaporative crystallizer with scale removing and preventing functions - Google Patents
MVR (mechanical vapor recompression) evaporative crystallizer with scale removing and preventing functions Download PDFInfo
- Publication number
- CN105854339A CN105854339A CN201610313599.3A CN201610313599A CN105854339A CN 105854339 A CN105854339 A CN 105854339A CN 201610313599 A CN201610313599 A CN 201610313599A CN 105854339 A CN105854339 A CN 105854339A
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- CN
- China
- Prior art keywords
- descaling
- antiscaling
- evaporated crystallization
- mvr
- crystallization device
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D9/00—Crystallisation
- B01D9/0004—Crystallisation cooling by heat exchange
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D1/00—Evaporating
- B01D1/26—Multiple-effect evaporating
-
- 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
- B01D2009/0086—Processes or apparatus therefor
Abstract
The invention discloses an MVR (mechanical vapor recompression) evaporative crystallizer with scale removing and preventing functions. The MVR evaporative crystallizer comprises a separator and a floatator which are communicated with each other, the floatator is provided with a material liquid inlet and a material liquid outlet, the material liquid outlet is communicated with the feeding end of a heat exchange tube in a heater, the discharging end of the heat exchange tube is communicated with a feeding end of a solid-liquid separator, inert solid particles are added into a solid collecting tank, the discharging end of the solid collecting tank is communicated with the heat exchange tube through a distributor, and the inert solid particles are distributed in the heat exchange tube uniformly through the distributor and are mixed with material liquid. The MVR evaporative crystallizer with the scale removing and preventing functions has the advantages that a scale induction period can be prolonged to the greatest extent, existing scale layers can be washed and removed, and a cleaning period can reach more than 8,000 hours (in a continuous operation state); the inner wall of the MRV evaporative crystallizer can be kept as smooth and clean as a new one, service life thereof is prolonged, and accordingly substantial economic, environmental and social benefits are created.
Description
Technical field
The present invention relates to a kind of descaling and antiscaling MVR mechanical compress evaporated crystallization device.
Background technology
The scale problems of the heater various degrees of evaporated crystallization device, it is particularly the inorganic salts such as sodium chloride, sodium sulfate, sodium hydroxide, magnesium chloride, magnesium sulfate at medium, and in the heater of the evaporation and concentration such as sewage disposal, food, sugaring, papermaking, desalinization, oil field waste, diaphragm caustic soda, ion film caustic soda, crystallization apparatus, material owing to being dissolved in feed liquid separates out, and scale problems is the most prominent.Fouling is phenomenon common in evaporated crystallization device, the fouling of evaporated crystallization device, not only reduce effective swept volume of equipment, adding thermal resistance and flow resistance, and the heat transfer coefficient adding heat pipe is reduced, production capacity declines, serious fouling also can make production pause, shorten effective production time, reduce service life of equipment even damage equipment, increase raw material and the consumption of the energy.
After fouling, existing processing mode typically uses mechanical cleaning or two kinds of methods of Chemical cleaning (difference according to dirt thing, the methods such as water soluble method, acid wash, soda boiling, mechanical descaling, pickling corrosion inhibiter, ultrasonic waves for cleaning can be used), equipment can be caused irreversible damage by mechanical cleaning frequently, and equipment is easily caused corrosion by Chemical cleaning, and the substantial amounts of cleaning waste water containing chemical composition can be produced, environment is caused the biggest pressure.Prior art is badly in need of a kind of descaling and antiscaling MVR mechanical compress evaporated crystallization device being not easy fouling.
Summary of the invention
It is an object of the invention to overcome defect present in prior art, it is provided that a kind of descaling and antiscaling MVR mechanical compress evaporated crystallization device being not easy fouling.
For achieving the above object, the technical scheme is that and provide a kind of descaling and antiscaling MVR mechanical compress evaporated crystallization device, separator and floatation device including connection, described floatation device is provided with feed liquid port and material liquid outlet, described material liquid outlet connects with the feeding end of the heat-exchange tube in heater, the discharge end of described heat-exchange tube connects with the feed end of solid-liquid separator, described solid-liquid separator is provided with solids exit end and gas-liquid discharge end, described solids exit end connects with solid collecting tank, and described gas-liquid discharge end connects with the feeding mouth of separator；Being added with inert solid particle in described solid collecting tank, described solid collecting tank discharge end, by distributor and heat-exchange tube UNICOM, in described inert solid particle is uniformly distributed in heat-exchange tube by distributor and mixes with feed liquid.
By using evaporated crystallization device described herein can extend dirt induction period greatly, also existing dirt layer can be washed away removal, so that the cleaning frequency reaches more than 8000 hours (under continuous duty), keep equipment inner wall sparkling clean simultaneously, in the service life of extension device, there is great economic benefit, environmental benefit and social benefit.
As preferably, described inert solid particle is any one or the combination of any two kinds in polytetrafluoroethylgranule granule, corundum in granules, glass particle or ceramic particle or the combination of any three kinds or the combination of four kinds.Such design is a kind of optimization to scheme.
As preferably, described inert solid particle is the size granule at 1 ~ 10mm.Such design is a kind of optimization to scheme
As preferably, described inert solid particle is 5% ~ 15% with the volume ratio of stock solution.Such design is a kind of optimization to scheme.
As preferably, described evaporated crystallization device also includes that feed pump is connected with feed pump and for the condensed water preheater preheating feed liquid, for providing the condensate pump of condensate water circulatory power to be connected and for storing the condensate water pot of condensed water with condensate pump；Described condensate water pot is connected with the condensation-water drain of heater；Described condensed water preheater material liquid outlet is connected with floatation device feed liquid port.Such design can utilize the condensed water of heater to preheat feed liquid, improves energy utilization rate.
As preferably, described separator top is provided with steam (vapor) outlet, and described steam (vapor) outlet is connected with vapour scrubber by secondary steam pipe.Such design is a kind of optimization to scheme
As preferably, described vapour scrubber connects with steam-water separation tank, and described steam-water separation tank is connected with vapour compression machine, and described vapour compression machine connects with heater.Such design can obtain the indirect steam of cleaning by indirect steam through vapour scrubber, to heater to feed liquid heat after improving the temperature of clean indirect steam after vapour compression machine after entering steam-water separation tank.
As preferably, described steam-water separation tank is provided with water circulating pump.The superheated steam that water circulating pump exports to vapour scrubber and vapour compression machine provides washings and temperature lowering water.
As preferably, it is connected with discharging pump bottom described floatation device.The discharge of thick magma material is easy in such design.
Advantages of the present invention and having the beneficial effects that: by using evaporated crystallization device described herein can extend dirt induction period greatly, also existing dirt layer can be washed away removal, so that the cleaning frequency reaches more than 8000 hours (under continuous duty), keep equipment inner wall sparkling clean simultaneously, in the service life of extension device, there is great economic benefit, environmental benefit and social benefit；
This device technique is reasonable, floor space is little, requisite space is the least, easy to operate, easily realize industrial automatic control, the feed liquid of high concentration and the evaporating, concentrating and crystallizing of high viscosity feed liquid are also adapted to, existing conventional evaporated crystallization device can also be transformed, equally reach anti-, the purpose of scale removal, solve a fouling difficult problem for current evaporated crystallization device, to the development promoting evaporative crystallization technique, reduce energy consumption, improve resource utilization etc. to have great importance, it is applicable to pharmacy, food, chemical industry, plant extract, biological engineering, glucose, xylose, evaporation and concentration and the operation of crystallization in the industries such as starch food.
Accompanying drawing explanation
Fig. 1 is present configuration schematic diagram.
In figure: 1, feed pump；2, condensed water preheater；3, condensate pump；4, condensate water pot；5, floatation device；6, discharging pump；7, separator；8, solid-liquid separator；9, upper communicating pipe；10, heater；11, vapour compression machine；12, solid collecting tank；13, lower communicating tube；14, uniform device；15, steam-water separation tank；16, vapour scrubber；17, water circulating pump；18, feed liquid port；19, material liquid outlet；20, heat-exchange tube；21, solids exit end；22, gas-liquid discharge end；24, secondary steam pipe.
Detailed description of the invention
Below in conjunction with the accompanying drawings and embodiment, the detailed description of the invention of the present invention is further described.Following example are only used for clearly illustrating technical scheme, and can not limit the scope of the invention with this.
As shown in Figure 1, a kind of descaling and antiscaling MVR mechanical compress evaporated crystallization device, separator 7 and floatation device 5 including connection, described floatation device 5 is provided with feed liquid port 18 and material liquid outlet 19, described material liquid outlet 19 connects with the feeding end of the heat-exchange tube 20 in heater 10, the discharge end of described heat-exchange tube 20 connects with the feed end of solid-liquid separator 8, described solid-liquid separator 8 is provided with solids exit end 21 and gas-liquid discharge end 22, described solids exit end 21 connects with solid collecting tank 12, and described gas-liquid discharge end 22 connects with the feeding mouth of separator 7；Being added with inert solid particle in described solid collecting tank 12, described solid collecting tank 12 discharge end, by distributor and heat-exchange tube 20 UNICOM, in described inert solid particle is uniformly distributed in heat-exchange tube 20 by distributor and mixes with feed liquid.
Under the driving of negative pressure of vacuum and heating, feed liquid enters heat-exchange tube 20 from floatation device 5, and flows to discharge end along the feeding end of heat-exchange tube 20 and carry out heat exchange.
Described inert solid particle is that the combination inert solid particle simultaneously of the combination of any one or any two kinds in polytetrafluoroethylgranule granule, corundum in granules, glass particle or ceramic particle or the combination of any three kinds or four kinds can also be for the combination in any of silk screen granule or silk screen with above-mentioned four kinds of granules.
Described inert solid particle is the size granule at 1 ~ 10mm.
Described inert solid particle is 5% ~ 15% with the volume ratio of stock solution.
Described evaporated crystallization device also includes that feed pump 1 is connected with feed pump 1 and for the condensed water preheater 2 preheating feed liquid, for providing the condensate pump 3 of condensate water circulatory power to be connected and for storing the condensate water pot 4 of condensed water with condensate pump 3；Described condensate water pot 4 is connected with the condensation-water drain of heater 10；Described condensed water preheater 2 material liquid outlet 19 is connected with floatation device 5 feed liquid port 18.
Described separator 7 top is provided with steam (vapor) outlet, and described steam (vapor) outlet is connected with vapour scrubber 16 by secondary steam pipe 24.
Described vapour scrubber 16 connects with steam-water separation tank 15, and described steam-water separation tank 15 is connected with vapour compression machine 11, and described vapour compression machine 11 connects with heater 10.
Described steam-water separation tank 15 is provided with water circulating pump 17.
It is connected with discharging pump 6 bottom described floatation device 5.
nullIn use，First proportionally inert solid particle is joined solid collecting tank 12，By feed pump 1 after the stock solution metering of room temperature，Enter condensed water preheater 2 and improve feed temperature (being preheating to evaporating temperature)，Enter floatation device 5、Heater 10，Open vapour compression machine 11 simultaneously，Now，Inert solid particle in solid collecting tank 12 is evenly distributed in heater 10 heat exchanger tube by lower communicating tube 13 and uniform device 14，After 10 feed temperatures of heater raise，Gas with inert solid particle、Liquid、Solid three-phase mixture entered solid-liquid separator 8 by upper communicating pipe 9，Solid particle and vapour phase in solid-liquid separator 8、Liquid phase separates under gravitational and centrifugal forces，Solids (inert solid particle) are through entering solid collecting tank 12，It is again introduced into heater 10 by lower communicating tube 13 and uniform device 14 and forms circuit cycle，Vapour phase、Liquid phase enters separator 7 by gas-liquid discharge end 22，Enter the vapour phase of separator 7、Liquid phase flash distillation rapidly under vacuo，Indirect steam rises through vapour scrubber 16，The indirect steam of cleaning is obtained after entering steam-water separation tank 15，Heat to heater 10 to feed liquid after improving the temperature of clean indirect steam after vapour compression machine 11，Concentrate magma and discharge system (going centrifugal separation process) via discharging pump 6.The condensed water of the heat that heater 10 produces discharges system after charging stock solution is preheated by condensed water preheater 2.Water circulating pump 17 provides washings and temperature lowering water to the superheated steam of vapour scrubber 16 and vapour compression machine 11 outlet.
At inert solid particle in the heat-exchange tube 20 of heater 10, due to inert solid particle constantly through liquid film boundary region, inert solid particle and heat exchanger tube internal face collides, wash away simultaneously, rubbing down etc. acts on, and can effectively remove the dirt adding heat pipe wall face.The addition of inert solid particle adds the nucleus of boiling, enhances nucleateboiling heat transfer, destroys heat transfer boundary layer, enhance the less turbulence of fluid, enhance convection heat transfer' heat-transfer by convection, heat transfer coefficient can be made to improve more than 20%, also reduce the temperature of heat transfer tube wall, it is achieved that gentle evaporation smoothly simultaneously.And greatly delayed induction period of scaling, also existing dirt layer can be washed away removal, so that the cleaning frequency reaches more than 8000 hours (under continuous duty).Inert solid particle is circulated use at device interior, it year waste only have 0.1%, operating cost is extremely low.
Tradition evaporated crystallization device is in order to ensure feed liquid flow velocity in heat exchanger tube and reduce dirt layer attachment in heat exchanger tube, usually use the high-power axial-flow pump of big flow, low lift, its operation energy consumption and maintenance cost and to run noise bigger, this device can fully phase out powerful forced circulation pump, reduce equipment investment and operating cost, decrease site area so that it is lower that equipment runs noise.
This device can have good anti-, descaling function to particulate foulings various in vaporising device, crystallization dirt, chemical reaction dirt, corrosion fouling, biofouling etc..
The PLC Automatic Control two kinds controlling to have Non-follow control and man machine interface according to user's requirement of this device.
The above is only the preferred embodiment of the present invention; it should be pointed out that, for those skilled in the art, on the premise of without departing from the technology of the present invention principle; can also make some improvements and modifications, these improvements and modifications also should be regarded as the protection domain of invention.
Claims (9)
1. a descaling and antiscaling MVR mechanical compress evaporated crystallization device, it is characterized in that: include separator and the floatation device of connection, described floatation device is provided with feed liquid port and material liquid outlet, described material liquid outlet connects with the feeding end of the heat-exchange tube in heater, the discharge end of described heat-exchange tube connects with the feed end of solid-liquid separator, described solid-liquid separator is provided with solids exit end and gas-liquid discharge end, described solids exit end connects with solid collecting tank, and described gas-liquid discharge end connects with the feeding mouth of separator；Being added with inert solid particle in described solid collecting tank, described solid collecting tank discharge end, by distributor and heat-exchange tube UNICOM, in described inert solid particle is uniformly distributed in heat-exchange tube by distributor and mixes with feed liquid.
2. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 1, it is characterised in that: described inert solid particle is any one or the combination of any two kinds in polytetrafluoroethylgranule granule, corundum in granules, glass particle or ceramic particle or the combination of any three kinds or the combination of four kinds.
3. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 2, it is characterised in that: described inert solid particle is the size granule at 1 ~ 10mm.
4. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 3, it is characterised in that: described inert solid particle is 5% ~ 15% with the volume ratio of stock solution.
5. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 4, it is characterised in that: described evaporated crystallization device also includes that feed pump is connected with feed pump and for the condensed water preheater preheating feed liquid, for providing the condensate pump of condensate water circulatory power to be connected and for storing the condensate water pot of condensed water with condensate pump；Described condensate water pot is connected with the condensation-water drain of heater；Described condensed water preheater material liquid outlet is connected with floatation device feed liquid port.
6. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 5, it is characterised in that: described separator top is provided with steam (vapor) outlet, and described steam (vapor) outlet is connected with vapour scrubber by secondary steam pipe.
Descaling and antiscaling MVR mechanical compress evaporated crystallization device the most as claimed in claims 6 or 7, it is characterised in that: described vapour scrubber connects with steam-water separation tank, and described steam-water separation tank is connected with vapour compression machine, and described vapour compression machine connects with heater.
8. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 7, it is characterised in that: described steam-water separation tank is provided with water circulating pump.
9. descaling and antiscaling MVR mechanical compress evaporated crystallization device as claimed in claim 8, it is characterised in that: it is connected with discharging pump bottom described floatation device.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610313599.3A CN105854339A (en) | 2016-05-12 | 2016-05-12 | MVR (mechanical vapor recompression) evaporative crystallizer with scale removing and preventing functions |
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| CN201610313599.3A CN105854339A (en) | 2016-05-12 | 2016-05-12 | MVR (mechanical vapor recompression) evaporative crystallizer with scale removing and preventing functions |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110563062A (en) * | 2019-09-24 | 2019-12-13 | 深圳市瑞升华科技股份有限公司 | Anti-scaling energy-saving evaporative crystallization system and evaporative crystallization process thereof |
| CN111732272A (en) * | 2020-06-17 | 2020-10-02 | 江苏江中纪元科技有限公司 | Multi-effect evaporation crystallization equipment with pretreatment and multi-effect evaporation crystallization process |
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| CN111732272A (en) * | 2020-06-17 | 2020-10-02 | 江苏江中纪元科技有限公司 | Multi-effect evaporation crystallization equipment with pretreatment and multi-effect evaporation crystallization process |
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Application publication date: 20160817 |