CN106524825A - Method and system for scale prevention and descaling of film type evaporator - Google Patents
Method and system for scale prevention and descaling of film type evaporator Download PDFInfo
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- CN106524825A CN106524825A CN201510585905.4A CN201510585905A CN106524825A CN 106524825 A CN106524825 A CN 106524825A CN 201510585905 A CN201510585905 A CN 201510585905A CN 106524825 A CN106524825 A CN 106524825A
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- heat exchange
- playpipe
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- antiscaling
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Abstract
The invention discloses a method and a system for the scale prevention and descaling of a film type evaporator. Two fluids sequentially pass a heat exchange surface at different flow rates, one is a main fluid with a relatively larger flow but a low flow rate, and the other is an auxiliary fluid with a relatively smaller flow but a high flow rate. First, the main fluid is sprayed on the heat exchange surface. Then, the auxiliary fluid is jet on the heat exchange surface at the high flow rate so as to scour off scale formed on the heat exchange surface. The method and the system have the beneficial effects that scaling speed is reduced, and descaling efficiency is increased; and under the condition of normal evaporation, the whole heat exchange surface is strongly interfered by the fluid which is jet at the high rate, and at a result of strong interference, the heat exchange efficiency of the main fluid is enhanced.
Description
Technical field
The present invention relates to the Anti-fouling Technology field of heat exchanger, more particularly to a kind of kestner long-tube evaporator antiscale is removed
Dirty method and system.
Background technology
Evaporation concentration system is to make solvent evaporation by the method for heating and leave solution, and nonvolatile solute is still
So it is dissolved in remaining liquid flux, realizes that solvent is separated with solute；It was concentrated by evaporation as general
Journey is completed in evaporimeter, and the usual dividing wall type heat exchanger of evaporimeter, i.e. side are thermals source, and other side is
Need the solution of evaporation and concentration to be processed.Due to containing solute in solution, for example salt, calcium ion, magnesium ion,
Organic matter etc., as solution evaporation thickens, it is possible to have solute to separate out in heat exchanger surface, be attached to heat exchange
Device surface, affects heat exchange, here it is generally say dirt.The thermal conductivity factor of steel is 50.2W/ (m K), dirt
Thermal conductivity factor be 0.2～2W/ (m K), differ 25～250 times, have statistics show dirt increase 3mm, change
Hot property declines 20% or so.
Horizontal pipe falling film evaporator is a kind of efficient heat exchange mode, and many beam heat exchanger tube levels are horizontal, stream in pipe
Thermal medium is moved, evaporation material gets off from heat exchanger tube uppermost spray, falls the heat exchanger tube on upper strata, againsts pipe outer
Flow downward, drop onto the heat exchanger tube of lower floor, solution is exchanged heat tube wall heating, and partial solvent is evaporated, real
Evaporation and concentration is showed.Horizontal pipe falling film evaporator heat exchange efficiency is high, but material is slow in heat exchanger tube surface flow speed,
Easily in heat exchanger surface fouling, need frequent shutdown snaking just to can ensure that heat exchange efficiency, have an effect on production effect
Rate.
Therefore prior art has much room for improvement and develops.
The content of the invention
The technical problem to be solved in the present invention is to provide a kind of speed that can slow down fouling, improves scale removal efficiency
Kestner long-tube evaporator antiscaling, descaling system and method.
Heat exchange pipe surface forms the factor of dirt varied, so preventing the method for dirt formation also varied.
From this angle of heat exchanger tube surface velocity, proposition prevents the principle and method of dirt formation to patent of the present invention.It is existing
Research show that the turbulent extent of heat exchanger surface is got over Gao Yueneng and prevents the formation of dirt, Reynolds number (Reynolds
Number, RE) turbulent extent of fluid can be characterized, Reynolds number is bigger, and turbulent flow is stronger；RE=ρ vd/
μ, wherein ρ, v, μ are respectively density, flow velocity and the viscosity coefficient of fluid, and d is characterized length, for determination
Heat transferring medium, ρ, μ be to determine (although ρ, μ and temperature, concentration etc. are relevant, have a small amount of variation,
But do not change less, can consider what is be to determine in engineering), for the heat exchange tube structure for determining, feature is long
Degree d is to determine, then RE is directly proportional to flow velocity v reason material, because high flow rate can be the dirt for just having been formed
Wash away, be not bonded in heat exchanger surface, there is no the cumulative effect of dirt, so improve flow velocity effectively can prolong
Delay the formation of dirt.Generally flow velocity is higher than 1.0m/s just certain antiscaling effect.
Kestner long-tube evaporator is that heat transferring medium forms membranaceous in heat exchange pipe surface, and after heat transferring medium is heated, part is steamed
Send out, be a kind of phase-change heat-exchange, in order to be conducive to draining for steam, heat exchange is not filled between heat exchange pipe surface and is situated between
Matter, that is to say, that the space of relative heat exchange pipe surface, heat transferring medium amount is less, and medium is in heat exchanger tube table
Surface current speed relatively low (generally below 0.1m/s), the structures shape of kestner long-tube evaporator heat transferring medium flow velocity are relatively low.
The present invention technical solution be：
A kind of kestner long-tube evaporator antiscaling, descaling method, using two kinds of flow rates of fluid successively through heat exchange surface；One
It is the low main fluid of the big flow velocity of relative discharge to plant,；Another is the high secondary fluid of the little flow velocity of relative discharge, first
Heat exchange surface is sprayed with main fluid；Again using the secondary fluid injection heat exchange surface of high flow rate, wash away in heat exchange
The dirt that surface is formed.
During antiscale, comprise the following steps：
1), steam enters steam chest from steam inlet, then from steam chest distribution in each heat exchanger tube；
2), second circulation pump is pumped to sprinkling system material from remittance fluid column or stoste entrance, and material is from sprinkling
System is uniformly sprayed to heat exchange pipe external surface, and unevaporated partial material enters remittance fluid column；
3), by the material pumping converged in fluid column to playpipe, material is projected first circulation pump from jet, punching
Hit on each heat exchange pipe external surface；
During scale removal, comprise the following steps：
4), steam inlet stops steam supply, closes after opening concentrate floss hole emptying all materials；
5), cleaning mixture is added from stoste entrance；First circulation pump and second circulation pump, cleaning mixture is run simultaneously
Sprinkling system is pumped to by second circulation pump, cleaning mixture is uniformly sprayed to heat exchange pipe external surface from sprinkling system,
Remittance fluid column is dropped down onto finally；
6) cleaning mixture in fluid column that, will converge is pumped to playpipe by first circulation pump, projects from jet and rushes
Hit on each heat exchange pipe external surface.
During antiscale, the outlet pressure of the first circulation pump is 0.4～1MPa.
During antiscale, the circular flow of first circulation pump is less than the 5% of the circular flow of second circulation pump.
A kind of system for realizing above-mentioned kestner long-tube evaporator antiscaling, descaling method, offers indirect steam including top
The kestner long-tube evaporator body of outlet, originally has many horizontally disposed heat exchanger tubes in vivo positioned at kestner long-tube evaporator
Heat-exchanging tube bundle, and the remittance fluid column of the sprinkling system that is separately positioned on above heat-exchanging tube bundle and lower section；Change per root
One end of heat pipe is connected with the steam chest with steam inlet, and the other end is connected with condensate liquid collection chamber；
Be additionally provided with the heat-exchanging tube bundle be uniformly distributed and horizontal positioned many playpipes, every playpipe is along axle
To offering multiple jets；And every playpipe by the injection line with first circulation pump with it is described
The fluid column that converges is connected；Whole heat exchanger tubes can be covered from the material of jet injection.
From the fluid that jet is ejected, flow is little, and flow velocity is high, high-speed fluid ejection heat exchange pipe external surface,
Wash away the dirt for just being formed in heat exchange pipe external surface；The formation of dirt can be effectively prevented, heat exchange efficiency is maintained
Long-term unattenuated or few decay.The material converged in fluid column enters playpipe by the pressurization of first circulation pump, sprays
Pipe is evenly distributed in heat-exchanging tube bundle, and the blowing angle of playpipe causes high-velocity fluid to be ejected into institute as far as possible
Some heat exchange pipe surfaces.In addition at a high speed the fluid of the injection pipe surface that makes entirely to exchange heat obtains strong disturbance, and strong
The result of strong disturbance is exactly to strengthen the heat exchange efficiency of main fluid.
The sprinkling system is connected with stoste entrance by the material pipeline with second circulation pump.
The jet section center line is intersected with the playpipe axis.
The playpipe can be rotatable around its axis, and the jet section center line is with the playpipe axis not
It is intersecting.
Also include the first support rim and the second support rim positioned at the playpipe two ends, the playpipe
Two ends are installed on the first support rim and the second support rim respectively.
A diameter of 1mm-3mm of the jet.
Hinge structure the invention has the beneficial effects as follows：Slow down the speed of fouling, improve scale removal efficiency, and
In the case of normal evaporation, the fluid of injection makes whole heat exchange surface obtain strong disturbance at a high speed, and disturbs strongly
Dynamic result is exactly to strengthen the heat exchange efficiency of main fluid.
Description of the drawings
Fig. 1 is overall structure diagram of the present invention；
Fig. 2 is heat-exchanging tube bundle longitudinal profile structure schematic；
Fig. 3 is playpipe horizontal cross-section structure diagram；
Longitudinal profile structure schematics of the Fig. 4 for Fig. 3；
Fig. 5 is the playpipe horizontal cross-section structure diagram of another kind of structure；
Longitudinal profile structure schematics of the Fig. 6 for Fig. 5.
Description of reference numerals：
1st, stoste entrance；2nd, second circulation pump；3rd, first circulation pump；4th, steam inlet；5th, steam chest；
6th, playpipe；7th, first member plate；8th, evaporation cavity；9th, heat exchanger tube；10th, indirect steam outlet；11st, spray
System；12nd, right end plate；13rd, condensate liquid collection chamber；14th, kestner long-tube evaporator body；15th, condensate discharge
Mouthful；16th, concentrate floss hole；17th, remittance fluid column；18th, jet；19th, the first support rim；20th,
Two support rims.
Specific embodiment
Embodiment：
Refering to Fig. 1, the present invention is using two kinds of flow rates of fluid through heat exchange surface.One kind is by second circulation pump 2
The main fluid of pumping, just as existing kestner long-tube evaporator, flow is big, and flow velocity is low；Another is by
The secondary fluid of the pumping of one circulating pump 3, flow are little, and flow velocity is high, high-speed fluid ejection heat exchange pipe surface, wash away
Fall the dirt for just being formed in heat exchange surface.Secondary fluid is ejected after the pressurization of first circulation pump 3, unit
The power consumption of mass flow is high compared with main fluid, but secondary fluid flow is few, typically only accounts for the 2-4% of main fluid, so
Overall energy consumption increases little.
Through the pressurization of first circulation pump 3 into playpipe 6, playpipe 6 is evenly distributed on heat-exchanging tube bundle to secondary fluid
In, and the blowing angle of playpipe 6 will make high-velocity fluid be ejected into all of heat exchange surface as far as possible so that
Kestner long-tube evaporator is prevented from the formation of dirt while work, maintains heat exchange efficiency long-term unattenuated or declines less
Subtract.
Another benefit that the present invention brings is to improve heat exchange efficiency, and the secondary fluid of injection makes whole at a high speed
Individual heat exchange surface obtains strong disturbance, and the result of strong disturbance is exactly to strengthen the heat exchange efficiency of main fluid.
Although aforesaid way can effectively prevent the formation of dirt, delay the working time, can not complete to prevent
After the formation of dirt, time length, or certain thickness dirt is accumulated, need to shut down scale removal.Scale removal process
Typically：Stop normal operation equipment, empty original solution, addition be conducive to dirt dissolving solution (depending on
The composition of dirt, using acid or alkaline solution), circulating pump is then started, makes acidity or alkaline solution not stop
Jing dirts surface, reaches the purpose of dissolving dirt, and at this time heat source side is not heated.The present invention is to improving scale removal
Efficiency is equally effective, or using two kinds of flow rates of fluid (detergent solution of acid or alkalescence) through heat transfer sheet
Face, but the flow of larger fluid is wanted, improve flow velocity.The descaling method using the present invention is experimentally confirmed,
The scale removal time of 80-95% can be saved than general only main flow body circulation scale removal.
As shown in figure 1, film-type evaporation system by kestner long-tube evaporator body 14, heat exchanger tube 9, playpipe 6,
Two circulating pumps 2, first circulation pump 3, stoste entrance 1, concentrate floss hole 16 etc. are constituted.
Wherein heat source side workflow is that steam enters steam chest 5 from steam inlet 4, then is distributed from steam chest 5
Into in each heat exchanger tube 9, steam chest 5 is arranged at the right end plate 12 of heat-exchanging tube bundle, and heat is by heat exchange
Material outside 9 wall heating tube of pipe, steam are condensed into liquid and flow to condensate liquid along heat exchanger tube 9 because of heat release
Collection chamber 13, condensed liquid floss hole 15 are discharged；Condensate liquid collection chamber 13 is arranged on the left end of heat-exchanging tube bundle
At plate 7.
Wherein heat side (i.e. evaporation side) workflow is second circulation pump 2 material from converging fluid column 17 or original
Liquid entrance 1 is pumped to sprinkling system 11, uniformly sprays to heat exchanger tube 9 from sprinkling system 11, and material is fallen and changed
9 outer surface of heat pipe, is partly evaporated, and unvaporized portion material drips next layer along 9 outer surface of heat exchanger tube and changes
Heat pipe 9, final unvaporized portion material enter remittance fluid column 17, and the Gaseous materials for being evaporated are gone out by indirect steam
Mouth 10 leaves kestner long-tube evaporator body 14, and stoste is added from stoste entrance 1, and concentrate is from concentrate floss hole
16 discharge, and the workflow of secondary fluid is that first circulation pump 3 is pumped to playpipe 6 material from remittance fluid column 17,
Material is projected from jet 18, is impacted on 9 surface of each heat exchanger tube, under the dirt on 9 surface of heat exchanger tube is washed away
Come, dirt is pooled to fluid column 17 and discharges with dope.
For guaranteeing that the liquid for spraying has impulsive force to dirt, need to maintain pressure of the material in playpipe 6, then
The outlet pressure for needing first circulation pump 3 is 0.4～1MPa, preferably 0.6～0.8MPa.
In the case of normal evaporation, the circular flow of first circulation pump 3 is big, and antiscaling effect is obvious, but recycle stream
Amount is excessive, and power consumption is also big, needs to find balance between antiscaling effect and power consumption, is generally directed to different things
Material, concentration and kestner long-tube evaporator are determined in debugging, by experimental results demonstrate, in first circulation pump 3
Circular flow can meet antiscale and also ensure that power consumption is not less than the 5% of the circular flow of second circulation pump 2
Very big, the circular flow preferably in first circulation pump 3 is the 3% of the circular flow of second circulation pump 2.
As run time is elapsed, if heat exchanger tube still defines dirt, need to shut down scale removal, the mistake of scale removal
Journey is as follows：Steam inlet 4 stops steam supply, opens concentrate floss hole 16 and empties all materials, from original
Liquid entrance 1 adds deployed cleaning mixture, while running second circulation pump 2, first circulation pump 3, scale removal mould
Under formula, the flow of first circulation pump 3 should be as big as possible.Cleaning mixture is delivered to playpipe 6 by first circulation pump 3,
Project from jet 18, impact on 9 surface of each heat exchanger tube, the dirt on 9 surface of heat exchanger tube is washed away.
Refering to Fig. 2, playpipe 6 is evenly distributed in heat-exchanging tube bundle, and the arrangement causes playpipe 6 to the greatest extent may be used
Each heat exchanger tube 9 can be ejected into.
Refering to Fig. 3 Fig. 4, playpipe 6 offers multiple jets 18 vertically, while jet 18 is uniform
Distribution 6 excircle of playpipe, 18 section center line of jet are intersected with 6 axis of playpipe, it is additionally preferred to sprayed
18 a diameter of 1mm-3mm of loophole.
Refering to Fig. 5 Fig. 6, playpipe 6 can be rotatable around its axis, and playpipe 6 is installed on the first support rim 19
On second support rim 20, the tendency certain angle arrangement of jet 18, i.e. 18 center line of jet and injection
6 axis of pipe is non-intersect.In the case where the reaction force of injection is promoted, playpipe 6 is rotated, and is so ejected
Carry out material just evenly.
Above-listed detailed description in detail is illustrating for possible embodiments of the present invention, and the embodiment is simultaneously not used to limit
The scope of the claims of the present invention, all equivalence enforcements or change without departing from carried out by the present invention are intended to be limited solely by this case
The scope of the claims in.
Claims (10)
1. a kind of kestner long-tube evaporator antiscaling, descaling method, it is characterised in that：Using Jing after two kinds of flow rates of fluid elder generations
Cross heat exchange surface；A kind of is the low main fluid of the big flow velocity of relative discharge；Another is the little flow velocity of relative discharge
High secondary fluid, first sprays heat exchange surface with main fluid；Again using the secondary fluid injection heat exchange surface of high flow rate,
Wash away the dirt formed in heat exchange surface.
2. kestner long-tube evaporator antiscaling, descaling method according to claim 1, it is characterised in that：
During antiscale, comprise the following steps：
1), steam enters steam chest from steam inlet, then from steam chest distribution in each heat exchanger tube；
2), second circulation pump is pumped to sprinkling system material from remittance fluid column or stoste entrance, and material is from sprinkling
System is uniformly sprayed to heat exchange pipe external surface, and unevaporated partial material enters remittance fluid column；
3), by the material pumping converged in fluid column to playpipe, material is projected first circulation pump from jet, punching
Hit on each heat exchange pipe external surface；
During scale removal, comprise the following steps：
4), steam inlet stops steam supply, closes after opening concentrate floss hole emptying all materials；
5), cleaning mixture is added from stoste entrance；First circulation pump and second circulation pump, cleaning mixture is run simultaneously
Sprinkling system is pumped to by second circulation pump, cleaning mixture is uniformly sprayed to heat exchange pipe external surface from sprinkling system,
Remittance fluid column is dropped down onto finally；
6) cleaning mixture in fluid column that, will converge is pumped to playpipe by first circulation pump, projects from jet and rushes
Hit on each heat exchange pipe external surface.
3. kestner long-tube evaporator antiscaling, descaling method according to claim 2, it is characterised in that：During antiscale,
The outlet pressure of the first circulation pump is 0.4～1MPa.
4. the kestner long-tube evaporator antiscaling, descaling method according to Claims 2 or 3, it is characterised in that：Antiscale
When, the circular flow of first circulation pump is less than the 5% of the circular flow of second circulation pump.
5. a kind of system for realizing kestner long-tube evaporator antiscaling, descaling method described in claim 1, opens including top
The kestner long-tube evaporator body of indirect steam outlet is provided with, originally there are many levels to set in vivo positioned at kestner long-tube evaporator
The heat-exchanging tube bundle of the heat exchanger tube put, and the remittance of the sprinkling system that is separately positioned on above heat-exchanging tube bundle and lower section
Fluid column；One end of every heat exchanger tube with connect with the steam chest of steam inlet, the other end is and condensate liquid
Collection chamber is connected；It is characterized in that：Be additionally provided with the heat-exchanging tube bundle be uniformly distributed and horizontal positioned it is many
Root playpipe, every playpipe offer multiple jets vertically；And every playpipe is by with the
The injection line of one circulating pump is connected with the remittance fluid column；Can cover whole from the material of jet injection
Heat exchanger tube.
6. kestner long-tube evaporator antiscaling, descaling system according to claim 5, it is characterised in that：The sprinkling
System is connected with stoste entrance by the material pipeline with second circulation pump.
7. kestner long-tube evaporator antiscaling, descaling system according to claim 5, it is characterised in that：The injection
Mouth section center line is intersected with the playpipe axis.
8. the kestner long-tube evaporator antiscaling, descaling system according to any one of claim 5-7, it is characterised in that：
The playpipe can be rotatable around its axis, and the jet section center line is non-intersect with the playpipe axis.
9. the kestner long-tube evaporator antiscaling, descaling system according to any one of claim 5-7, it is characterised in that：
Also include the first support rim and the second support rim positioned at the playpipe two ends, the playpipe two ends
It is installed on the first support rim and the second support rim respectively.
10. the kestner long-tube evaporator antiscaling, descaling system according to any one of claim 5-7, it is characterised in that：
A diameter of 1mm-3mm of the jet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510585905.4A CN106524825B (en) | 2015-09-15 | 2015-09-15 | A kind of kestner long-tube evaporator antiscaling, descaling method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510585905.4A CN106524825B (en) | 2015-09-15 | 2015-09-15 | A kind of kestner long-tube evaporator antiscaling, descaling method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106524825A true CN106524825A (en) | 2017-03-22 |
| CN106524825B CN106524825B (en) | 2018-12-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510585905.4A Active CN106524825B (en) | 2015-09-15 | 2015-09-15 | A kind of kestner long-tube evaporator antiscaling, descaling method and system |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168224A (en) * | 2023-11-03 | 2023-12-05 | 江苏嘉尚环保科技有限公司 | Evaporator with automatic descaling function |
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|---|---|---|---|---|
| US3195614A (en) * | 1961-12-01 | 1965-07-20 | Pittsburgh Plate Glass Co | Process of concentrating solutions of sodium and potassium chloride as falling films on heated surfaces |
| CN2714600Y (en) * | 2004-07-06 | 2005-08-03 | 中国林业科学研究院林产化学工业研究所 | Solution circulation spraying falling-film evaporator |
| CN1995899A (en) * | 2006-11-24 | 2007-07-11 | 华中科技大学 | Water current on-line scale remover for surface evaporation type air cooling device |
| CN101338991A (en) * | 2008-07-04 | 2009-01-07 | 洪鑫鹏 | Automatic cleaning device for evaporating air cooler |
| CN203291537U (en) * | 2013-06-17 | 2013-11-20 | 四川东联新能源科技有限公司 | Horizontal tube type falling film evaporator |
-
2015
- 2015-09-15 CN CN201510585905.4A patent/CN106524825B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3195614A (en) * | 1961-12-01 | 1965-07-20 | Pittsburgh Plate Glass Co | Process of concentrating solutions of sodium and potassium chloride as falling films on heated surfaces |
| CN2714600Y (en) * | 2004-07-06 | 2005-08-03 | 中国林业科学研究院林产化学工业研究所 | Solution circulation spraying falling-film evaporator |
| CN1995899A (en) * | 2006-11-24 | 2007-07-11 | 华中科技大学 | Water current on-line scale remover for surface evaporation type air cooling device |
| CN101338991A (en) * | 2008-07-04 | 2009-01-07 | 洪鑫鹏 | Automatic cleaning device for evaporating air cooler |
| CN203291537U (en) * | 2013-06-17 | 2013-11-20 | 四川东联新能源科技有限公司 | Horizontal tube type falling film evaporator |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117168224A (en) * | 2023-11-03 | 2023-12-05 | 江苏嘉尚环保科技有限公司 | Evaporator with automatic descaling function |
| CN117168224B (en) * | 2023-11-03 | 2024-02-02 | 江苏嘉尚环保科技有限公司 | Evaporator with automatic descaling function |
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|---|---|
| CN106524825B (en) | 2018-12-18 |
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