CN102698451A - Heat pump type low-temperature evaporating device and method - Google Patents
Heat pump type low-temperature evaporating device and method Download PDFInfo
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Abstract
一种热泵型低温蒸发装置及方法，属于化工分离和节能减排技术领域。其特征是在载热媒介的制热循环过程中把溶剂蒸发、冷凝以达到低温下蒸发浓缩热敏料液或回收有机溶剂的目的；装置主要由料液蒸发器、气液分离器、二次蒸汽冷凝器、凝液罐、热媒储罐、热媒蒸汽压缩机、过滤器、料液泵、凝液泵、节流装置及管路阀门等组成，其中料液蒸发器采用单效或多效降膜蒸发器。通过调节系统真空度来控制料液蒸发温度在25-60℃间；通过变频调节压缩机输入功率来控制系统制热量和蒸发量之间的匹配。本发明的效果和益处是：可以减少气体排放，环保节能；另外低温蒸发可维持料液有效成分，设备腐蚀较轻，不易堵塞管道，减少了设备成本。
A heat pump type low-temperature evaporation device and method belong to the technical field of chemical separation and energy saving and emission reduction. It is characterized in that the solvent is evaporated and condensed during the heating cycle of the heat-carrying medium to achieve the purpose of evaporating and concentrating the heat-sensitive feed liquid at low temperature or recovering the organic solvent; the device is mainly composed of a feed-liquid evaporator, a gas-liquid separator, and a secondary Steam condenser, condensate tank, heat medium storage tank, heat medium steam compressor, filter, feed liquid pump, condensate pump, throttling device and pipeline valves, among which the feed liquid evaporator adopts single-effect or multi-effect Efficient falling film evaporator. The evaporation temperature of the material liquid is controlled between 25-60°C by adjusting the vacuum degree of the system; the matching between the heating capacity and the evaporation capacity of the system is controlled by adjusting the input power of the compressor through frequency conversion. The effects and benefits of the invention are: gas emission can be reduced, environmental protection and energy saving; in addition, low-temperature evaporation can maintain the effective components of the feed liquid, the equipment is less corroded, the pipeline is not easy to be blocked, and the equipment cost is reduced.
Description
Technical field
The invention belongs to chemical separating and energy-conserving and emission-cutting technology field, relate to a kind of heat sensitive material and the low-temperature evaporation technology and the device that reclaim low boiling point solvent, specially referring to heating agent, to heat circulation technological with the heat pump energy-conserving of solution evaporation, solvent condenses coupling.
Background technology
In evaporation and concentration operation, sex change can take place or scab at the evaporation wall to influence evaporation efficiency and product quality in its active ingredient when heat sensitive material was met high temperature, so the influence of evaporating temperature is very important control condition.For example in biological medicine food industry, its portioned product non-refractory, promptly heat sensitive material needs under worst cold case, to evaporate.In low-temperature evaporation, mechanical vapour compression (MVR) method has its weakness, and directly the indirect steam specific volume of compression is very big, and the steam after the compression will be operated under the higher temperature scope just has efficient preferably.Will increase specific volume and reduce vapor (steam) temperature, cause the increase of cost of equipment and operating cost.In addition; The increase of specific volume will cause the increase of steam flow rate; In evaporation corrosive material (like vitamin C, tartaric acid etc.) process; The indirect steam that produces causes that more easily material carries secretly, and directly compression can make indirect steam contact and the corrosion compressor that contains the corrosivity material, has a strong impact on the life-span of compressor.
Pump type heat evaporimeter and multi-effect evaporator are all energy-saving evaporimeter.Pump type heat evaporator operation temperature is low and be easy to regulate and control according to the actual requirements, is more suitable in the evaporation of heat sensitive material and the recovery of low boiling point solvent.Compare the effect that the organic solvent extraction effect is superior to water as extractant, the use of organic solvent constantly increases in the leaching process in recent years, but organic solvent has characteristics such as boiling point is low, inflammable and explosive, poisonous, contaminated environment.Utilize the low characteristics of cryogen evaporating temperature, from the feed liquid stram condenser, take away heat, reduce the exhaust temperature of condenser, promptly discharge organic steam content in the tail gas after reducing to the environment permissible range.The capacity of heating agent both vapor compression is much smaller than the capacity of direct pressurized water steam, and the operating temperature interval is low, so be specially adapted to low-temperature evaporation.Therefore in the low-temperature evaporation of heat sensitive material reclaims with low boiling point solvent, for energy-conservation and reduce compressor volume, prolong compressor life-span, reduce to invest and increase economic efficiency, the pump type heat cryogenic vaporization systems is arisen at the historic moment.
Summary of the invention
The invention provides the auxiliary pump type heat low-temperature evaporation device and method of a kind of heat-carrying media, can effectively utilize heat energy, make heat sensitive material in the lower temperature evaporation and concentration and keep its active ingredient, the high efficiente callback organic solvent has reduced noxious gas emission.
Technical scheme of the present invention is following:
A kind of pump type heat low-temperature evaporation device; Be to heat the auxiliary pump type heat low-temperature evaporation device of circulation, this device comprises feed liquid evaporimeter, gas-liquid separator, indirect steam condenser, lime set jar, heating agent storage tank, heating agent vapour compression machine, filter, feed pump, lime set pump and throttling arrangement; Wherein, the following outlet of feed liquid evaporimeter is connected to the centre entrance of gas-liquid separator, and the upper outlet of gas-liquid separator is connected to the upper inlet of indirect steam condenser; The following outlet of indirect steam condenser is connected to the lime set jar, is connected with the lime set pump on the lime set jar; The following outlet of feed liquid evaporimeter is connected to the heating agent storage tank, is connected to the lower inlet of indirect steam condenser through heating agent storage tank, filter and throttling arrangement; The heating agent steam that the heating agent vapour compression machine comes out the indirect steam condenser overhead is delivered to the feed liquid evaporimeter.Feed pump is sent the feed liquid of gas-liquid separator outlet at bottom back to the feed liquid evaporimeter.
Described feed liquid evaporimeter can adopt single-action or multiple-effect falling film evaporimeter.
Said apparatus is that the solvent in the feed liquid is evaporated, condensation in the cyclic process of the compression of heat-carrying media, condensation, expansion, evaporation again, reaches concentrated feed liquid and recovery solvent under cryogenic conditions; Step is following:
A) heat-carrying media steam is evaporated concentrated material at feed liquid evaporator condensation heat release heating evaporation; The back flows into the heating agent storage tank; Filter by filter; After the throttling arrangement throttling, get into the evaporation of indirect steam condenser, steam gets into the heating agent vapour compression machine, and the heating agent steam after the increasing temperature and pressure gets into the feed liquid evaporimeter again and forms a loop;
B) feed liquid is formed another loop through feed pump, feed liquid evaporimeter, gas-liquid separator; Feed liquid gets into system by the feed liquid evaporimeter, and through steaming solvent after the circulation, circulation reaches setting value until solution concentration so repeatedly;
C) solvent vapo(u)r of evaporator evaporation gets into condenser through separator, the laggard lime set storage tank of heat release condensation, after the lime set pump is discharged, the condensation latent heat heating heat-carrying media of release makes its carburation by evaporation.
During work, control the feed liquid evaporating temperature through regulating system vacuum, scope is at 25-60 ℃; Control the coupling between system's heating capacity and the evaporation capacity through the variable frequency adjustment compressor power input.But it should be noted that Compressor Discharge Pressure should not surpass its machinery and bear pressure, be generally below the 2.5MPa.Along with the increase of feed concentration, effective temperature difference is more and more littler, and it is constant to keep system pressure, improves compressor frequency and compressor power input and keeps required evaporation rate.
The input of institute of system energy requirement is only provided by the power of heating agent vapour compression machine, the heat supply that discharges during solvent vapo(u)r condensation that the heat that heating agent evaporation needs in the indirect steam condenser is flowed out by the feed liquid evaporimeter.
The present invention adopts the auxiliary pump type heat low-temperature evaporation device of heating agent circulation, and whole process structure is compact; Only need the heating agent vapour compression machine that power is provided and do not have the input of other outside energy, the heat supply that discharges during steam condensation that the heat that heating agent evaporation needs in the condenser is flowed out by evaporimeter has reduced operating cost; Adopt suitable heating agent can make system carry under the low temperature operation, feed liquid is evaporated at low temperatures and keep its active ingredient, equipment corrosion is lighter, is difficult for blocking pipe, has reduced equipment cost; Heating agent is prone to compress and evaporating temperature is low can make the effective condensation of solvent vapo(u)r, reduces the gas discharging, environmental protection and energy saving; Heat pump COP can reach 3-5.
Description of drawings
Accompanying drawing is the described pump type heat cryogenic vaporizer of embodiment of the invention system process figure.
Among the figure: 1 feed liquid evaporimeter; 2 gas-liquid separators; 3 indirect steam condensers; 4 lime set jars; 5 heating agent storage tanks; 6 heating agent vapour compression machines; 7 filters; 8 feed pumps; 9 lime set pumps; 10 throttling arrangements.
The specific embodiment
Combination technology scheme and accompanying drawing use the pump type heat cryogenic vaporizer to be described in detail the specific embodiment of the present invention as example with small-scale test.
Embodiment 1
As shown in the figure, feed liquid evaporimeter heat transfer area is 0.58m
2, the stram condenser area is 1.58 m
2, compressor uses totally-enclosed 5 compressors of paddy wheel CRNQ-0500-TFO-272 type, and throttling arrangement uses heating power expansion valve.With R22 is heating agent, the glucose solution of evaporation and concentration 10.5%.
The material circulation: the lime set tank top is extracted on-condensible gas out to keep system pressure between 2.5-5kPa by vavuum pump; Solvent or diluent liquid arrives specified altitude through being pumped into evaporimeter to separator liquid level; Be evenly distributed to each heat-transfer pipe of evaporimeter and be membranaceous by the filming device of pumping feed liquid spray flux 300L/h and flow down, evaporation between 28 ℃-38 ℃ of evaporating temperatures behind the heat of the outer heating agent steam of liquid film absorption tube through the evaporimeter top.Indirect steam gas-liquid separation in separator for evaporation feed liquid and generation; Solution is back to evaporimeter; 26-33 ℃ steam gets into behind the condenser under the helical duct that forms along the coil pipe outer wall and flow to the lime set storage tank; Liberated heat is used for the heating agent evaporation when reclaiming the condensation of feed liquid steam simultaneously, and about 18-22 ℃ solvent lime set is made an appointment with after the lime set pumping goes out.The heating agent circulation: expansion became 37-49 ℃ saturated vapor after exhaust outlet of compressor 80-103 ℃ heating agent steam got into evaporimeter; Be condensed into 33-45 ℃ liquid with the feed liquid heat exchange; Be 6-12 ℃ gas-liquid mixture after the throttling, the back gets into stram condenser, and always to absorb heat of vaporization be that 25-34 ℃ steam gets into compressor once more and accomplishes once circulation.The feed liquid evaporation rate is 3.5kg/h-9.1kg/h, and the evaporimeter heat transfer temperature difference is 6-10 ℃, and heat transfer coefficient is 900-1200Wm
-2℃, the condenser heat transfer temperature difference is 3-7 ℃, heat transfer temperature difference 350-600 Wm
-2℃.
Claims (4)
1. pump type heat low-temperature evaporation device; Be to heat the auxiliary pump type heat low-temperature evaporation device of circulation; It is characterized in that this pump type heat low-temperature evaporation device comprises feed liquid evaporimeter (1), gas-liquid separator (2), indirect steam condenser (3), lime set jar (4), heating agent storage tank (5), heating agent vapour compression machine (6), filter (7), feed pump (8), lime set pump (9) and throttling arrangement (10); Wherein, the following outlet of feed liquid evaporimeter (1) is connected to the centre entrance of gas-liquid separator (2), and the upper outlet of gas-liquid separator (2) is connected to the upper inlet of indirect steam condenser (3); The following outlet of indirect steam condenser (3) is connected to lime set jar (4), is connected with lime set pump (9) on the lime set jar (4); The following outlet of feed liquid evaporimeter (1) is connected to heating agent storage tank (5), is connected to the lower inlet of indirect steam condenser (3) through heating agent storage tank (5), filter (7) and throttling arrangement (10); The heating agent steam that heating agent vapour compression machine (6) comes out indirect steam condenser (3) top is delivered to feed liquid evaporimeter (1); Feed pump (8) is sent the feed liquid of gas-liquid separator (2) outlet at bottom back to feed liquid evaporimeter (1).
2. device as claimed in claim 1 is characterized in that: the feed liquid evaporimeter adopts single-action or multiple-effect falling film evaporimeter.
3. utilizing the method for claim 1 or 2 said devices, is that the solvent in the feed liquid is evaporated, condensation in the cyclic process of compression, condensation, expansion, evaporation again at the heat-carrying media, reaches under cryogenic conditions concentrated feed liquid and reclaims solvent; Its characteristic may further comprise the steps:
A) heat-carrying media steam is evaporated concentrated material at feed liquid evaporimeter (1) condensation heat release heating evaporation; The back flows into heating agent storage tank (5); Filter by filter (7); After throttling arrangement (10) throttling, get into indirect steam condenser (3) evaporation, steam gets into heating agent vapour compression machine (6), and the heating agent steam after the increasing temperature and pressure gets into feed liquid evaporimeter (1) again and forms a loop;
B) feed liquid is formed another loop through feed pump (8), feed liquid evaporimeter (1), gas-liquid separator (2); Feed liquid is by feed liquid evaporimeter (1) access to plant, and through steaming solvent after the circulation, circulation reaches setting value until solution concentration so repeatedly;
C) solvent vapo(u)r of feed liquid evaporimeter (1) evaporation gets into indirect steam condenser (3) through gas-liquid separator (2), the laggard lime set storage tank of heat release condensation (4), after lime set pump (9) is discharged, the condensation latent heat heating heat-carrying media of release makes its carburation by evaporation.
4. method according to claim 3 is characterized in that: control the feed liquid evaporating temperature through regulating system vacuum, scope is at 25-60 ℃; Control the coupling between system's heating capacity and the evaporation capacity through variable frequency adjustment heating agent vapour compression machine (6) input power.
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| CN2012102351126A CN102698451A (en) | 2012-07-05 | 2012-07-05 | Heat pump type low-temperature evaporating device and method |
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| CN106807098A (en) * | 2016-12-27 | 2017-06-09 | 中山市中环环保废液回收有限公司 | A kind of low-temperature evaporation equipment |
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| CN108386827A (en) * | 2018-04-06 | 2018-08-10 | 无锡诚尔鑫环保装备科技有限公司 | A kind of steam generation facility and its application method using waste heat |
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| CN104383702A (en) * | 2014-10-15 | 2015-03-04 | 上海森松新能源设备有限公司 | Organic acid purifying method and its apparatus |
| CN104399267B (en) * | 2014-12-01 | 2016-04-13 | 大连理工大学 | A flash wave vapor recompression continuous evaporation system |
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| CN105582684A (en) * | 2016-03-14 | 2016-05-18 | 常州中源工程技术有限公司 | Mechanical compression and evaporation device for acid solution evaporation and recovery and treatment method thereof |
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Application publication date: 20121003 |