CN209797526U - Gypsum crystal scale prevention system applied to MVR - Google Patents
Gypsum crystal scale prevention system applied to MVR Download PDFInfo
- Publication number
- CN209797526U CN209797526U CN201920169181.9U CN201920169181U CN209797526U CN 209797526 U CN209797526 U CN 209797526U CN 201920169181 U CN201920169181 U CN 201920169181U CN 209797526 U CN209797526 U CN 209797526U
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- CN
- China
- Prior art keywords
- gypsum
- mother liquor
- evaporator
- heat exchanger
- mvr
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- 229910052602 gypsum Inorganic materials 0.000 title claims abstract description 59
- 239000010440 gypsum Substances 0.000 title claims abstract description 59
- 239000013078 crystal Substances 0.000 title claims abstract description 46
- 230000002265 prevention Effects 0.000 title claims description 5
- 239000012452 mother liquor Substances 0.000 claims abstract description 35
- 238000012546 transfer Methods 0.000 claims abstract description 14
- 239000007788 liquid Substances 0.000 claims abstract description 9
- 238000002425 crystallisation Methods 0.000 claims description 6
- 230000008025 crystallization Effects 0.000 claims description 6
- 238000011084 recovery Methods 0.000 claims description 5
- 238000010992 reflux Methods 0.000 claims description 5
- 238000007667 floating Methods 0.000 claims description 3
- 230000008901 benefit Effects 0.000 abstract description 10
- 239000002351 wastewater Substances 0.000 abstract description 9
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical compound [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 abstract description 8
- 229910001424 calcium ion Inorganic materials 0.000 abstract description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 abstract description 6
- 238000004140 cleaning Methods 0.000 abstract description 6
- 239000007791 liquid phase Substances 0.000 abstract description 6
- 239000000126 substance Substances 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 3
- 230000008676 import Effects 0.000 abstract description 2
- 238000000034 method Methods 0.000 description 9
- 230000008569 process Effects 0.000 description 7
- 230000008020 evaporation Effects 0.000 description 6
- 238000001704 evaporation Methods 0.000 description 6
- 230000006872 improvement Effects 0.000 description 5
- 230000009467 reduction Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000010842 industrial wastewater Substances 0.000 description 3
- 150000003839 salts Chemical class 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 238000004134 energy conservation Methods 0.000 description 2
- 229910017053 inorganic salt Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000001556 precipitation Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- NIAGBSSWEZDNMT-UHFFFAOYSA-M tetraoxidosulfate(.1-) Chemical compound [O]S([O-])(=O)=O NIAGBSSWEZDNMT-UHFFFAOYSA-M 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000003373 anti-fouling effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000003203 everyday effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
Abstract
The utility model discloses an use gypsum crystal scale control system in MVR, including evaporimeter, heat exchanger, forced circulation pump and mother liquor jar, evaporimeter, heat exchanger and forced circulation pump connect into circulation circuit jointly, and the mother liquor jar passes through the pipeline and puts through with circulation circuit, is provided with gypsum crystal import and feed liquid export on the evaporimeter. Based on the principle that the affinity of the same substance is greater than that of the different substances, the gypsum crystals are uniformly dispersed in the liquid-phase wastewater, calcium ions and sulfate ions in the wastewater can be coagulated on the gypsum crystals and crystallized and separated out, so that the problems of uneven heat transfer and low heat transfer efficiency caused by the fact that the calcium ions and the sulfate ions are attached to the surface of an evaporator are effectively avoided, and the aim of prolonging the cleaning period is fulfilled. Can bring greater economic benefit, social benefit and environmental benefit.
Description
Technical Field
the utility model relates to a MVR evaporation crystallization technical field, in particular to use gypsum crystal scale control system in MVR.
Background
Along with industrial production, a large amount of industrial wastewater is produced every day, particularly some high-salt industrial wastewater is produced, and at present, inorganic salt with certain value is extracted from the high-salt industrial wastewater by an MVR evaporation crystallization mode, and the inorganic salt is recycled, sold and changed into valuables. At present, the main equipment in the MVR process is an evaporator, in the evaporation process, salt is gradually increased to form crystal precipitation, part of the crystal precipitation is attached to the surface of the evaporator, so that uneven heat transfer and low heat transfer efficiency are caused, energy is wasted, and when the heat transfer efficiency is serious, a pipe is broken possibly, and the pipe needs to be stopped and cleaned regularly.
In order to solve the problem of evaporator scaling, the existing method adopts a chemical method or a mechanical method to remove the scale in a stopping state, which has the disadvantages of production reduction, cleaning solution consumption and product quality influence caused by stopping, and meanwhile, the cleaning solution must be cleaned periodically and continuously, the discharged cleaning solution can pollute the environment, the production efficiency is seriously influenced, the aim of reducing energy consumption is violated, and the waste and the loss are serious.
Therefore, how to efficiently and energy-efficiently solve the problem of scaling of an evaporator in an MVR evaporative crystallization process becomes a technical problem to be solved urgently by those skilled in the art.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide an use gypsum crystal scale control system in MVR to solve the problem that provides in the above-mentioned background art.
The technical scheme adopted for solving the technical problems is as follows: the utility model provides an use gypsum crystal scale control system in MVR, includes evaporimeter, heat exchanger, forced circulation pump and mother liquor jar, evaporimeter, heat exchanger and forced circulation pump pass through the pipe connection and form circulation circuit, and the mother liquor jar passes through the pipeline and the circulation circuit switch-on, be provided with gypsum crystal import and feed liquid export on the evaporimeter.
As an improvement to the above, the gypsum crystal inlet is used to add gypsum crystals to the mother liquor in the evaporator.
As an improvement of the scheme, a gypsum separator is arranged on the circulation loop and connected with a centrifugal machine, a gypsum discharge port is arranged on the centrifugal machine, and the centrifugal machine is communicated with a mother liquor tank through a pipeline to form a mother liquor recovery loop.
As an improvement of the scheme, a mother liquor reflux pump is arranged on the mother liquor recovery loop.
As a modification of the above, the evaporator is one of a circulation type evaporator, a once-through type evaporator and a direct contact heat transfer type evaporator.
As an improvement of the scheme, the heat exchanger is one of a floating head type heat exchanger, a fixed tube plate type heat exchanger, a U-shaped tube plate type heat exchanger and a plate type heat exchanger.
As an improvement of the scheme, the centrifuge is a gap centrifuge or a continuous centrifuge.
Has the advantages that: the utility model discloses in, this principle of affinity based on the affinity of same kind of material is greater than the heterogeneous material, will be the gypsum crystal of solid small granule and disperse in liquid phase waste water uniformly, calcium ion and sulfate radical ion in the waste water can condense on gypsum crystal and crystallization out, have effectively avoided because of calcium ion and sulfate radical ion adhere to the uneven and the low problem of heat transfer efficiency of heat transfer that leads to on the surface of evaporimeter and heat exchanger. In the operation process of the system, the problem of scaling of the evaporator and the heat exchanger can be effectively solved only by adding a proper amount of gypsum crystals into the system, so that the heat transfer efficiency is improved, the aim of prolonging the cleaning period is fulfilled, the actual production time is prolonged, the labor intensity is reduced, energy conservation, emission reduction, yield increase and consumption reduction are realized for enterprises, and greater economic benefit, social benefit and environmental benefit are brought.
Drawings
The invention is further described with reference to the following figures and examples:
FIG. 1 is a schematic diagram of a gypsum crystal scale control system for use in MVR.
Detailed Description
Referring to fig. 1, the utility model relates to a gypsum crystal anti fouling system who uses in MVR comprises evaporimeter 1, heat exchanger 2, forced circulation pump 3, gypsum separator 4, centrifuge 5, mother liquor jar 6 and mother liquor backwash pump 7 etc.. Wherein, the evaporator 1, the heat exchanger 2 and the forced circulation pump 3 form a circulation loop under the communication of the pipelines, and the mother liquor tank 6 is communicated with the circulation loop through the pipelines so as to inject the mother liquor into the circulation loop. Liquid phase wastewater is contained in the mother liquor tank 6 and flows into the circulation loop under the action of the mother liquor reflux pump 7. The evaporator 1 is provided with a gypsum crystal inlet 11 and a feed liquid outlet 12, and gypsum crystals are added into the liquid-phase wastewater in the evaporator 1 through the gypsum crystal inlet 11.
The liquid phase wastewater contains calcium ions and sulfate ions, and solid granular gypsum crystals are uniformly dispersed in the liquid phase wastewater. Based on the principle that the affinity of the same substance is greater than that of the different substances, calcium ions and sulfate ions in the wastewater can be coagulated on solid gypsum crystal nuclei and crystallized and separated out, so that the problems of uneven heat transfer and low heat transfer efficiency caused by the fact that the calcium ions and the sulfate ions are attached to the surfaces of the evaporator 1 and the heat exchanger 2 are effectively avoided. In the operation process of the system, the problem of scaling of the evaporator 1 and the heat exchanger 2 can be effectively solved only by adding a proper amount of gypsum crystals into the system, so that the heat transfer efficiency is improved, the aim of prolonging the cleaning period is fulfilled, the actual production time is prolonged, the labor intensity is reduced, energy conservation, emission reduction, yield increase and consumption reduction are realized for enterprises, and great economic benefit, social benefit and environmental benefit are brought. The system has wide prospect in MVR evaporative crystallization industry.
Practice shows that: the content of gypsum crystal in the mother liquor is kept between 15g/L and 40g/L, if the content is lower than 15g/L, the amount of the crystal seed cannot achieve the purpose of scale prevention, and if the content is higher than 40g/L, the salt quality and the evaporation amount are influenced.
In the running process of the system, the gypsum crystal seeds are gradually enlarged due to continuous adsorption of calcium ions and sulfate ions. From the above practical data, when the content of the gypsum crystal in the mother liquor is higher than a certain value, the salt and the evaporation amount are affected, so the gypsum separator 4 is arranged on the circulation loop, the gypsum separator 4 is connected with the centrifuge 5, the centrifuge 5 is provided with a gypsum discharge port 51, and the centrifuge 5 is communicated with the mother liquor tank 6 through a pipeline to form a mother liquor recovery loop. When the concentration of the gypsum crystals reaches a set value, the gypsum crystals enter the centrifuge 5 through the gypsum separator 4, the gypsum separator 4 has the function of screening large-particle gypsum crystals, the principle of the gypsum separator is equivalent to that of a sieve, large-particle gypsum crystals are intercepted and enter the centrifuge 5, and small-particle gypsum crystals continue to stay in mother liquor of the circulation loop. Large-particle gypsum crystals are discharged through a gypsum discharge port 51 of the centrifuge 5, and the residual mother liquor flows back to the mother liquor tank 6, and then the mother liquor is pumped back to the circulation loop by a mother liquor reflux pump 7.
The specific operation flow of the anti-scaling system is as follows:
In the operation process of the system, gypsum crystals are added from a gypsum crystal inlet 11 and enter the evaporator 1, then the feed liquid is sent into the heat exchanger 2 by the forced circulation pump 3 for heating, the feed liquid after heat exchange is evaporated and concentrated in the evaporator 1, and the feed liquid is discharged from a feed liquid outlet 12 when the feed liquid reaches a set concentration.
After the concentration of the gypsum crystals growing continuously reaches a set value, discharging the gypsum crystals in a gypsum separator 4 to enter a centrifugal machine 5, discharging gypsum through centrifugal discharging, and pumping residual mother liquor into a mother liquor tank 6 and pumping the mother liquor back to an evaporation system by a mother liquor reflux pump 7.
The evaporator 1 may be one of a circulation type evaporator, a once-through type evaporator, and a direct contact heat transfer type evaporator, among others. The heat exchanger 2 may be one of a floating head heat exchanger, a fixed tube and plate heat exchanger, a U-tube and plate heat exchanger. The centrifuge may be a gap centrifuge or a continuous centrifuge. In combination with practical situations, the evaporator 1, the heat exchanger 2 and the centrifuge 5 are selected to be suitable to be applied in the gypsum crystal anti-scaling system so as to achieve the best effect.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the scope of knowledge possessed by those skilled in the art.
Claims (7)
1. The utility model provides an use gypsum crystal scale control system in MVR which characterized in that: the gypsum crystallization device comprises an evaporator, a heat exchanger, a forced circulation pump and a mother liquor tank, wherein the evaporator, the heat exchanger and the forced circulation pump are connected through pipelines to form a circulation loop, the mother liquor tank is communicated with the circulation loop through a pipeline, and a gypsum crystal inlet and a feed liquid outlet are formed in the evaporator.
2. The system of claim 1, wherein the system comprises: the gypsum crystal inlet is used to add gypsum crystals to the mother liquor in the evaporator.
3. The system of claim 1, wherein the system comprises: and a gypsum separator is arranged on the circulation loop, the gypsum separator is connected with a centrifugal machine, a gypsum discharge port is arranged on the centrifugal machine, and the centrifugal machine is communicated with a mother liquor tank through a pipeline to form a mother liquor recovery loop.
4. the system of claim 3, wherein the system comprises: a mother liquor reflux pump is arranged on the mother liquor recovery loop.
5. The gypsum crystal scale prevention system applied in MVR according to any one of claims 1 to 4, wherein: the evaporator is one of a circulation evaporator, a once-through evaporator and a direct contact heat transfer evaporator.
6. The gypsum crystal scale prevention system applied in MVR according to any one of claims 1 to 4, wherein: the heat exchanger is one of a floating head type heat exchanger, a fixed tube plate type heat exchanger, a U-shaped tube plate type heat exchanger and a plate type heat exchanger.
7. The system of claim 3, wherein the system comprises: the centrifuge is a gap centrifuge or a continuous centrifuge.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920169181.9U CN209797526U (en) | 2019-01-30 | 2019-01-30 | Gypsum crystal scale prevention system applied to MVR |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920169181.9U CN209797526U (en) | 2019-01-30 | 2019-01-30 | Gypsum crystal scale prevention system applied to MVR |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209797526U true CN209797526U (en) | 2019-12-17 |
Family
ID=68821701
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201920169181.9U Active CN209797526U (en) | 2019-01-30 | 2019-01-30 | Gypsum crystal scale prevention system applied to MVR |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209797526U (en) |
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2019
- 2019-01-30 CN CN201920169181.9U patent/CN209797526U/en active Active
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