CN110104664A - A kind of antiscaling method mentioning nitre heat exchanger surface - Google Patents
A kind of antiscaling method mentioning nitre heat exchanger surface Download PDFInfo
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- CN110104664A CN110104664A CN201910335712.1A CN201910335712A CN110104664A CN 110104664 A CN110104664 A CN 110104664A CN 201910335712 A CN201910335712 A CN 201910335712A CN 110104664 A CN110104664 A CN 110104664A
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- China
- Prior art keywords
- nitre
- heat exchanger
- caldo
- calcium sulfate
- slurry
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01D—COMPOUNDS OF ALKALI METALS, i.e. LITHIUM, SODIUM, POTASSIUM, RUBIDIUM, CAESIUM, OR FRANCIUM
- C01D5/00—Sulfates or sulfites of sodium, potassium or alkali metals in general
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
Abstract
The invention discloses a kind of antiscaling method for mentioning nitre heat exchanger surface, include the following steps: to mention caldo clarified solution and nitre slurry while be passed through in heat exchanger to mix, after mixed liquor is heated up, separated, what is obtained mentions caldo clarified solution and nitre slurry recycling；Wherein, the flow for mentioning caldo clarified solution is 320~480m3The flow of/h, the nitre slurry are 80~120m3/ h, and the mass content of calcium sulfate is 3~7% in nitre slurry.By nitre containing calcium sulfate being added in caldo starching to mentioning in the present invention, calcium sulfate in nitre slurry is identical with crystal seed structure with the calcium sulfate molecule structure mentioned in caldo, the calcium sulfate mentioned in caldo has better affinity to the calcium sulfate in nitre slurry, it can be preferentially attached on the calcium sulfate to suspend, to crystallize and enter in crystallizer with mixed liquor, calcium sulfate is greatly reduced in the attachment phenomenon of exchanger tube wall.
Description
Technical field
The invention belongs to preventing fouling fields, and in particular to a kind of antiscaling method for mentioning nitre heat exchanger surface.
Background technique
The sodium chloride brine resource distribution range in China is wider, but the brine type in the main area Chan Yan is sodium sulfate type,
In addition to main content sodium chloride, secondary content sodium sulphate is averagely up to 25g/l, additionally contains a small amount of calcium sulfate, magnesium sulfate.Master contains
After measuring sodium chloride separation, generally using sal prunella co-production method, frozen saltpeter mention method, saltouing proposes the methods of nitre method for sodium sulphate from system
It separates.It proposes nitre method using saltouing and mentions nitre, since former halogen does not purify, calcium sulphate content is 1.5g/l or so, is easily mentioning nitre
Dirty layer is formed on heat exchanger tube, and calcium sulfate heat resistance of the scale is very big, influence heat exchanger tube heat transfer, block heat exchanger tube when serious completely,
Heat exchanger tube largely blocks at general production 2~3 months, by forced-stopping machine.
Currently, the method for solving heat exchanger tube fouling is broadly divided into chemical method and physical method, chemical method antiscale is application
The chemical property of chemical scale inhibition agent itself come prevent or slow down dirt generation, the method for chemical scale inhibition mainly has softening at this stage
The methods of method, acidization and antisludging agent.But chemical method antiscale is there are many disadvantage, phosphorous in scale preventative at this stage, easily causes
Water eutrophication, while the higher cost of antisludging agent.The method of scale inhibition preferably selects then free of contamination physical method antiscale, mesh
Preceding physical method scale removal is mainly the heat exchanger tube that pass blocking plug is rushed with jetting machine.Since calcium sulfate is insoluble in water, quality is hard, single
Platform heat exchanger washing time at least 2~3 days, and after mentioning nitre system shutdown, it will cause very big influence to salt making system.Therefore,
Solving heat exchanger tube fouling, to propose nitre method very crucial to saltouing.
Summary of the invention
It is an object of the invention to overcome above-mentioned technical deficiency, a kind of antiscaling method for mentioning nitre heat exchanger surface is proposed, solve
It certainly saltouts the technical issues of proposing the easy fouling of heat exchanger tube in nitre method.
To reach above-mentioned technical purpose, technical solution of the present invention provides a kind of antiscaling method for mentioning nitre heat exchanger surface,
Include the following steps: to mention caldo clarified solution and nitre slurry while be passed through in heat exchanger to mix, mixed liquor is heated up, separated
Afterwards, what is obtained mentions caldo clarified solution and nitre slurry recycling；Wherein, the flow for mentioning caldo clarified solution be 320~
480m3The flow of/h, the nitre slurry are 80~120m3/ h, and the mass content of calcium sulfate is 3~7% in nitre slurry.
Compared with prior art, the beneficial effect comprise that
1, in the present invention by mention the calcium sulfate for nitre containing calcium sulfate is added in caldo clarified solution starching, in nitre slurry and
The calcium sulfate molecule structure mentioned in caldo is identical with crystal seed structure, mentions the calcium sulfate in caldo clarified solution to the sulphur in nitre slurry
Sour calcium has better affinity, can be preferentially attached on the calcium sulfate to suspend, to crystallize and enter crystallizer with mixed liquor
In, calcium sulfate is greatly reduced in the attachment phenomenon of exchanger tube wall；
2, the mass content of the invention by adjusting calcium sulfate in the flow for mentioning caldo clarified solution and nitre slurry and nitre slurry,
The degree of supersaturation for mentioning calcium sulfate in caldo clarified solution can be reduced, so that it is existing to be further reduced fouling of the calcium sulfate on heat exchanger tube
As, and avoid the excessively high quality for influencing final products of calcium sulphate content；
3, using method heat exchanger continuously-running half a year non-scaling of the invention, the heat exchange of heat exchanger tube fouling blockage is avoided
Pipe is forced parking and is dredged, not only reduces production cost, improve work efficiency, also achieve sal prunella and propose nitre technique
The operation of continuous-stable.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to embodiments, to the present invention
It is further elaborated.It should be appreciated that embodiment described herein is only used to explain the present invention, it is not used to limit
The present invention.
The embodiment provides a kind of antiscaling method for mentioning nitre heat exchanger surface, include the following steps: that nitre will be mentioned
Brine clarified solution and nitre slurry while being passed through in heat exchanger and mixed, after mixed liquor is heated up, is separated, obtain to mention caldo clear
Clear liquid and nitre slurry are recycled；Wherein, the flow for mentioning caldo clarified solution is 320~480m3/ h, nitre slurry flow be 80~
120m3/ h, and the mass content of calcium sulfate is 3~7% in nitre slurry.
In the present invention, mixed liquor is separated by crystallizer, and crystallizer upper layer is to mention caldo clarified solution, and lower layer is nitre
Slurry；It mentions caldo clarified solution and enters salt making system, contain the substances such as calcium sulfate, sodium sulphate, calcium chloride and sodium chloride, warp in nitre slurry
Take out finished product nitre after dehydrating.Nitre slurry can be made full use of to participate in circulation in preheater in the present invention, it not only can be significantly
The fouling of heat exchanger tube in heat exchanger is reduced, and does not reduce the yield of finished product nitre in cyclic process.
In some preferred embodiments of the invention, the ratio between flow of caldo clarified solution and nitre slurry is mentioned as 4:1；With into
One step reduces scale formation of the calcium sulfate on heat exchanger tube.
It is highly preferred that the flow for mentioning caldo clarified solution is 400m3/ h, the flow of nitre slurry are 100m3/h。
In some preferred embodiments of the invention, the mass content of calcium sulfate is 5% in nitre slurry；Nitre halogen is mentioned to reduce
The degree of supersaturation of calcium sulfate in water reduces scale formation of the calcium sulfate on heat exchanger tube, and avoids the excessively high influence of calcium sulphate content
The quality of final products.
In the present invention, nitre slurry in also contain sodium chloride and calcium chloride, and the mass content of sodium chloride and calcium chloride≤
5%.
In some preferred embodiments of the invention, the mass content of sodium chloride is 2~5% in nitre slurry, calcium chloride
Mass content is 2~5%；The content of sodium chloride and calcium chloride is higher, the calcium sulfate mentioned in caldo can be promoted to be preferentially adsorbed on
On calcium sulfate in nitre slurry, and promote calcium sulfate nucleus growth, to reduce the crystalline polamer of heat exchange pipeline inner wall, while can be with
The too high levels for avoiding sodium chloride and calcium chloride influence the purity of final products sodium sulphate.
In the present invention, the temperature of mixed liquor is risen to 97~99 DEG C.
In some preferred embodiments of the invention, the temperature of mixed liquor is risen to 98~98.5 DEG C；So as to mention nitre halogen
More calcium sulfate are precipitated in clarification of water liquid, and on the calcium sulfate being attached in nitre slurry, to improve the pure of final products sodium sulphate
Degree.
In the present invention, the nitre slurry in crystallizer is evacuated in heat exchanger using the pressure of 0.2~0.4Mpa.
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, to this
Invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, not
For limiting the present invention.
Experimental method in the present invention is unless otherwise specified conventional method.Experimental material used in the present invention is such as
It is that market is commercially available without specified otherwise.
Embodiment 1:
It saltouts and mentions nitre technique analysis nitre and carried out in crystallizer, using OSL type crystallizer, the upper layer of crystallizer is to mention caldo
Clarified solution, lower layer are nitre slurry, and heat exchanger uses dismountable tubular heat exchanger, and a feed inlet of heat exchanger and crystallizer
Upper end proposes the connection of caldo settling section, another feed inlet is connect with nitre stock pump outlet, clear in order to mention caldo respectively
Clear liquid and nitre slurry are evacuated in heat exchanger, and there are one discharge ports for heat exchanger.It specifically uses following technique: caldo clarified solution will be mentioned
It is evacuated in heat exchanger and is mixed simultaneously from different feed inlets with nitre slurry, mention caldo clarified solution and enter the flow of heat exchanger and be
400m3/ h, the flow that nitre slurry enters heat exchanger is 100m3/ h, and the mass content of calcium sulfate is 5% in nitre slurry, the matter of sodium chloride
Measuring content is 5%, and the mass content of calcium chloride is 5%；Caldo clarified solution and nitre slurry are mentioned after mixing, by the temperature of mixed liquor
Degree rises to 98.5 DEG C, then mixed liquor is evacuated to crystallizer and is separated, and the clear liquid on upper layer and the slurries of lower layer can be recycled.
Detection shows that the temperature of each pipe of tubular heat exchanger does not change after tubular heat exchanger is run 6 months, will be detachable
Tubular heat exchanger dismantle observation tubular heat exchanger fouling condition, it can be observed that fouling does not occur substantially for tubular heat exchanger.
Embodiment 2:
It saltouts and mentions nitre technique analysis nitre and carried out in crystallizer, using OSL type crystallizer, the upper layer of crystallizer is to mention caldo
Clarified solution, lower layer are nitre slurry, and heat exchanger uses dismountable tubular heat exchanger, and a feed inlet of heat exchanger and crystallizer
Upper end proposes the connection of caldo settling section, another feed inlet is connect with nitre stock pump outlet, clear in order to mention caldo respectively
Clear liquid and nitre slurry are evacuated in heat exchanger, and there are one discharge ports for heat exchanger.It specifically uses following technique: caldo clarified solution will be mentioned
It is evacuated in heat exchanger and is mixed simultaneously from different feed inlets with nitre slurry, mention caldo clarified solution and enter the flow of heat exchanger and be
320m3/ h, the flow that nitre slurry enters heat exchanger is 100m3/ h, and the mass content of calcium sulfate is 4.5% in nitre slurry, sodium chloride
Mass content is 4%, and the mass content of calcium chloride is 3%；Caldo clarified solution and nitre slurry are mentioned after mixing, by mixed liquor
Temperature rises to 98 DEG C, then mixed liquor is evacuated to crystallizer and is separated, and the clear liquid on upper layer and the slurries of lower layer can be recycled.
Detection shows that the temperature of each pipe of tubular heat exchanger does not change after tubular heat exchanger is run 6 months, will be detachable
Tubular heat exchanger dismantle observation tubular heat exchanger fouling condition, it can be observed that tubular heat exchanger only has one layer of very thin calcium
Dirt, being rinsed with water can fall.
Embodiment 3:
It saltouts and mentions nitre technique analysis nitre and carried out in crystallizer, using OSL type crystallizer, the upper layer of crystallizer is to mention caldo
Clarified solution, lower layer are nitre slurry, and heat exchanger uses dismountable tubular heat exchanger, and a feed inlet of heat exchanger and crystallizer
Upper end proposes the connection of caldo settling section, another feed inlet is connect with nitre stock pump outlet, clear in order to mention caldo respectively
Clear liquid and nitre slurry are evacuated in heat exchanger, and there are one discharge ports for heat exchanger.It specifically uses following technique: caldo clarified solution will be mentioned
It is evacuated in heat exchanger and is mixed simultaneously from different feed inlets with nitre slurry, mention caldo clarified solution and enter the flow of heat exchanger and be
480m3/ h, the flow that nitre slurry enters heat exchanger is 100m3/ h, and the mass content of calcium sulfate is 5.5% in nitre slurry, sodium chloride
Mass content is 4%, and the mass content of calcium chloride is 4%；Caldo clarified solution and nitre slurry are mentioned after mixing, by mixed liquor
Temperature rises to 98 DEG C, then mixed liquor is evacuated to crystallizer and is separated, and the clear liquid on upper layer and the slurries of lower layer can be recycled.
Detection shows that the temperature of each pipe of tubular heat exchanger does not change after tubular heat exchanger is run 6 months, will be detachable
Tubular heat exchanger dismantle observation tubular heat exchanger fouling condition, it can be observed that tubular heat exchanger only has one layer of very thin calcium
Dirt, being rinsed with water can fall.
Embodiment 4:
It saltouts and mentions nitre technique analysis nitre and carried out in crystallizer, using OSL type crystallizer, the upper layer of crystallizer is to mention caldo
Clarified solution, lower layer are nitre slurry, and heat exchanger uses dismountable tubular heat exchanger, and a feed inlet of heat exchanger and crystallizer
Upper end proposes the connection of caldo settling section, another feed inlet is connect with nitre stock pump outlet, clear in order to mention caldo respectively
Clear liquid and nitre slurry are evacuated in heat exchanger, and there are one discharge ports for heat exchanger.It specifically uses following technique: caldo clarified solution will be mentioned
It is evacuated in heat exchanger and is mixed simultaneously from different feed inlets with nitre slurry, mention caldo clarified solution and enter the flow of heat exchanger and be
480m3/ h, the flow that nitre slurry enters heat exchanger is 80m3/ h, and the mass content of calcium sulfate is 3% in nitre slurry, the matter of sodium chloride
Measuring content is 3%, and the mass content of calcium chloride is 3%；Caldo clarified solution and nitre slurry are mentioned after mixing, by the temperature of mixed liquor
Degree rises to 99 DEG C, then mixed liquor is evacuated to crystallizer and is separated, and the clear liquid on upper layer and the slurries of lower layer can be recycled.
Detection shows that the temperature of last root tubulation declines 0.5 DEG C after tubular heat exchanger is run 6 months, will be dismountable
Tubular heat exchanger dismantles the fouling condition of observation tubular heat exchanger, it can be observed that tubular heat exchanger only has one layer of very thin calcium
Dirt, being rinsed with water can fall.
Embodiment 5:
It saltouts and mentions nitre technique analysis nitre and carried out in crystallizer, using OSL type crystallizer, the upper layer of crystallizer is to mention caldo
Clarified solution, lower layer are nitre slurry, and heat exchanger uses dismountable tubular heat exchanger, and a feed inlet of heat exchanger and crystallizer
Upper end proposes the connection of caldo settling section, another feed inlet is connect with nitre stock pump outlet, clear in order to mention caldo respectively
Clear liquid and nitre slurry are evacuated in heat exchanger, and there are one discharge ports for heat exchanger.It specifically uses following technique: caldo clarified solution will be mentioned
It is evacuated in heat exchanger and is mixed simultaneously from different feed inlets with nitre slurry, mention caldo clarified solution and enter the flow of heat exchanger and be
320m3/ h, the flow that nitre slurry enters heat exchanger is 120m3/ h, and the mass content of calcium sulfate is 7% in nitre slurry, the matter of sodium chloride
Measuring content is 2%, and the mass content of calcium chloride is 2%；Caldo clarified solution and nitre slurry are mentioned after mixing, by the temperature of mixed liquor
Degree rises to 97 DEG C, then mixed liquor is evacuated to crystallizer and is separated, and the clear liquid on upper layer and the slurries of lower layer can be recycled.
Detection shows that the temperature of last root tubulation declines 0.5 DEG C after tubular heat exchanger is run 6 months, will be dismountable
Tubular heat exchanger dismantles the fouling condition of observation tubular heat exchanger, it can be observed that tubular heat exchanger only has one layer of very thin calcium
Dirt, being rinsed with water can fall.
The above described specific embodiments of the present invention are not intended to limit the scope of the present invention..Any basis
Any other various changes and modifications that technical concept of the invention is made should be included in the guarantor of the claims in the present invention
It protects in range.
Claims (8)
1. a kind of antiscaling method for mentioning nitre heat exchanger surface, which comprises the steps of: will mention caldo clarified solution and
Nitre slurry is passed through in heat exchanger and is mixed simultaneously, after mixed liquor is heated up, is separated, obtain mention caldo clarified solution and nitre is starched and is followed
Ring uses；Wherein, the flow for mentioning caldo clarified solution is 320~480m3The flow of/h, the nitre slurry are 80~120m3/
H, and the mass content of calcium sulfate is 3~7% in nitre slurry.
2. the antiscaling method according to claim 1 for mentioning nitre heat exchanger surface, which is characterized in that described to propose caldo clarification
The ratio between liquid and the flow of nitre slurry are 4:1.
3. the antiscaling method according to claim 1 or 2 for mentioning nitre heat exchanger surface, which is characterized in that described to mention caldo
The flow of clarified solution is 400m3The flow of/h, the nitre slurry are 100m3/h。
4. the antiscaling method according to claim 1 for mentioning nitre heat exchanger surface, which is characterized in that calcium sulfate in the nitre slurry
Mass content be 5%.
5. the antiscaling method according to claim 1 for mentioning nitre heat exchanger surface, which is characterized in that also contain in the nitre slurry
Sodium chloride and calcium chloride, and the mass content of sodium chloride and calcium chloride is ≤5%.
6. the antiscaling method according to claim 5 for mentioning nitre heat exchanger surface, which is characterized in that sodium chloride in the nitre slurry
Mass content be 2~5%, the mass content of calcium chloride is 2~5%.
7. the antiscaling method according to claim 1 for mentioning nitre heat exchanger surface, which is characterized in that by the temperature liter of mixed liquor
To 97~99 DEG C.
8. the antiscaling method according to claim 7 for mentioning nitre heat exchanger surface, which is characterized in that by the temperature liter of mixed liquor
To 98~98.5 DEG C.
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| CN201910335712.1A CN110104664B (en) | 2019-04-24 | 2019-04-24 | Antiscaling method for surface of saltpeter extraction heat exchanger |
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| CN201910335712.1A CN110104664B (en) | 2019-04-24 | 2019-04-24 | Antiscaling method for surface of saltpeter extraction heat exchanger |
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| CN110104664B CN110104664B (en) | 2021-12-17 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102032835A (en) * | 2010-12-22 | 2011-04-27 | 南京中电联环保股份有限公司 | Surface anti-scaling method for evaporator for brine |
| CN102060312A (en) * | 2010-11-15 | 2011-05-18 | 江苏井神盐化股份有限公司 | Method and device for preventing bittern delivery pipeline from scaling |
| CN108585227A (en) * | 2018-04-17 | 2018-09-28 | 天津科技大学 | A kind of high-temperature sulfuric acid calcium type Brine pre -heater surface antiscaling method |
| CN109133108A (en) * | 2018-08-29 | 2019-01-04 | 山东肥城海晶盐化有限公司 | Non- purification calcium sulfate type brine heat pump salt producing craft |
| CN109534363A (en) * | 2018-12-10 | 2019-03-29 | 中盐枣阳盐化有限公司 | A kind of thick nitre extracting method |
-
2019
- 2019-04-24 CN CN201910335712.1A patent/CN110104664B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102060312A (en) * | 2010-11-15 | 2011-05-18 | 江苏井神盐化股份有限公司 | Method and device for preventing bittern delivery pipeline from scaling |
| CN102032835A (en) * | 2010-12-22 | 2011-04-27 | 南京中电联环保股份有限公司 | Surface anti-scaling method for evaporator for brine |
| CN108585227A (en) * | 2018-04-17 | 2018-09-28 | 天津科技大学 | A kind of high-temperature sulfuric acid calcium type Brine pre -heater surface antiscaling method |
| CN109133108A (en) * | 2018-08-29 | 2019-01-04 | 山东肥城海晶盐化有限公司 | Non- purification calcium sulfate type brine heat pump salt producing craft |
| CN109534363A (en) * | 2018-12-10 | 2019-03-29 | 中盐枣阳盐化有限公司 | A kind of thick nitre extracting method |
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