CN100436992C - A freezing dryer for compressed air - Google Patents

A freezing dryer for compressed air Download PDF

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Publication number
CN100436992C
CN100436992C CNB2006100504704A CN200610050470A CN100436992C CN 100436992 C CN100436992 C CN 100436992C CN B2006100504704 A CNB2006100504704 A CN B2006100504704A CN 200610050470 A CN200610050470 A CN 200610050470A CN 100436992 C CN100436992 C CN 100436992C
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CN
China
Prior art keywords
compressed air
tube evaporator
tube
full liquid
forecooler
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Expired - Fee Related
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CNB2006100504704A
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Chinese (zh)
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CN1837734A (en
Inventor
程成
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HANGZHOU HANKE PURIFYING EQUIPMENT CO Ltd
Zhejiang University of Technology ZJUT
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HANGZHOU HANKE PURIFYING EQUIPMENT CO Ltd
Zhejiang University of Technology ZJUT
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Priority to CNB2006100504704A priority Critical patent/CN100436992C/en
Publication of CN1837734A publication Critical patent/CN1837734A/en
Application granted granted Critical
Publication of CN100436992C publication Critical patent/CN100436992C/en
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Abstract

The present invention relates to a compressed air freezing drier which comprises a precooler, a flooded shell-and-tube evaporator, a filter-type steam-water separator, an automatic drainer, a coolant compressor, a condenser and an expansion valve, wherein the precooler, the flooded shell-and-tube evaporator, the filter-type steam-water separator and the automatic drainer are in sequential connection and form a compressed air circulation loop; the coolant compressor, the flooded shell-and-tube evaporator, the expansion valve and the condenser are in sequential connection and form a coolant circulation loop. Because the utility model adopts the flooded shell-and-tube evaporator, the service efficiency of the evaporator and the efficiency of the compressor are both increased, and the heat transfer efficiency or the efficiency ratio is increased; moreover, the structure is compact, and the installation and the maintenance are convenient.

Description

A kind of freezing dryer for compressed air
(1) technical field
The present invention relates to a kind of freezing dryer for compressed air.
(2) background technology
Compressed air is as a kind of power, because its outstanding superiority and the purification techniques of maturation gradually, makes it in the application of every field more and more widely and more and more important, and the compressed air drying equipment supporting with it also meets the tendency and flourish.Than other many compressed air drying technology, freezing type drier has remarkable advantages, as: the air-flow treating capacity is big, and power consumption is few, and pressure drop is little, reliable noiselessness.
In freezing type drier, evaporimeter is the main heat exchanger components and the critical component of cooling driers.Compressed air is forced to cooling in evaporimeter, wherein most of water vapor is cooled off and condensed into outside the aqueous water discharge machine, thereby makes compressed air obtain drying.What carry out in evaporimeter is convection current caloic exchange between air and the refrigerant low-pressure steam, by the low pressure refrigerant liquid behind the throttling arrangement, at evaporimeter and then undergo phase transition and become low pressure refrigerant steam, in phase transition process, absorb ambient heat, thereby make the compressed air cooling.
At present, the evaporimeter of domestic cooling driers all adopts traditional dry type (standing) formula evaporimeter that crouches, and does not adopt full liquid shell and tube evaporator.Full liquid shell and tube evaporator uses in handpiece Water Chilling Units or other refrigeration system usually, and refrigerating medium is a water.
On heat exchange method, the dry evaporator tube side is walked cold-producing medium, and shell side is walked air, the coolant injection amount is generally about 40% of pipe internal volume, and flow of refrigerant has several flow processs usually, because the gasification gradually of refrigerant liquid, logical Cheng Yue makes progress, and its flow process pipe number is many more.Use the shortcoming of dry evaporator to be:
1. in order to increase the air side heat exchange, be provided with several deflection plates, the repeatedly horizontal tube bundle of plunderring of air is flowed in the outside of cylindrical shell heat-transfer pipe.Can produce heat exchanger tube feed flow uneven phenomenon inevitably, cause heat exchange insufficient, effective heat exchange area can not be fully used.
2. cold-producing medium has a plurality of flow processs, produces hydrops at the end cap turning as handling bad meeting, thereby makes the liquid maldistribution that enters next flow process, influences heat-transfer effect.
3. at the pore and the pipe way of refrigerating medium side deflection plate, be easy to generate the leakage by-pass flow between deflection plate periphery and housing, thereby can reduce its heat-transfer effect.
4. overheated refrigerant steam accounts for evaporimeter heat and passes 20% of area, but only can provide the enthalpy of a small amount of refrigeration, so evaporimeter total heat transfer efficiency is lower.
5. the refrigerant of thermal expansion valve of flowing through must be kept certain pressure reduction, with refrigerant circulation and the refrigerating capacity of guaranteeing system.But this kind control model must be kept certain system high pressure, when on high-tension side operating condition is lower than design condition or during in fractional load, system effectiveness can't promote thereupon.
6. in the multi-compressor system, the refrigerant circulation is independent separately, and some idle heat exchange area of unloading back can't utilize, so the fractional load performance of system is restricted.
(3) summary of the invention
In order to overcome the deficiency that the freezing dryer for compressed air heat-transfer effect is relatively poor in the prior art, heat transfer efficiency is lower, the invention provides a kind of freeze drier with New Evaporator, its heat-transfer effect is good, heat transfer efficiency is high.
The technical solution adopted for the present invention to solve the technical problems is: a kind of freezing dryer for compressed air, comprise forecooler, full liquid shell and tube evaporator, steam-water separator, automatic water trap, cold medium compressor, condenser and throttling arrangement, described evaporimeter is the full liquid shell and tube evaporator of the logical compressed air of tube side, the logical refrigerant of shell side;
Described forecooler, full liquid shell and tube evaporator, steam-water separator, automatic water trap connects successively and form the compressed air closed circuit; Described cold medium compressor, full liquid shell and tube evaporator, throttling arrangement is connected successively with condenser and form refrigerant circulation circuit;
Further, described full liquid shell and tube evaporator, forecooler have two, between the full liquid shell and tube evaporator, vertical setting in parallel between the forecooler.
Further, the heat exchange copper tube of described full liquid shell and tube evaporator and the heat exchange copper tube of described forecooler all adopt the smooth wall copper pipe.
Further, also be provided with oil removal filter on the compressed air closed circuit between described automatic water trap and the full liquid shell and tube evaporator.
Throttling arrangement is selected expansion valve for use, and steam-water separator is selected the filtering type steam-water separator for use.
The present invention is when work, and saturated compressed air enters in the forecooler, the cold air precooling of at first being come out from evaporimeter, and then enter in the evaporimeter, in evaporimeter, further cool off by refrigerant.After the air cooling, airborne steam is condensed into the liquid water droplets of carrying dirt and oil secretly, drop separated by steam-water separator subsequently and by automatic water trap with outside its discharge machine, steam-water separator simultaneously can also be removed a large amount of liquid pollutants and the solid particle more than 3 microns efficiently.Air dry, cooling turns back to forecooler, and discharge outside the drying machine heat back again.
The tube side of full liquid shell and tube evaporator is walked air, and shell side is walked liquid refrigerants.Refrigerant is full of about 70% of the whole volume of shell side, and liquid level is steady, and the heat transfer temperature difference is 2 ℃, and the air conditioning condition evaporating temperature is 5 ℃, and outlet refrigerant superheat temperature is at 1.5~2 ℃.
The beneficial effect of freezing dryer for compressed air of the present invention mainly shows: 1. evaporimeter has the heat biography surface of complete wetting, can increase the service efficiency of evaporimeter, improves the system low-voltage lateral pressure.
2. liquid refrigerants is in the boiling of evaporimeter shell-side, and crushing is less, and temperature is also more even.Steam because of the suction side enters compressor with approaching saturated gaseous state simultaneously, so can increase the compression efficiency and the mass flowrate of compressor.
3. full liquid shell and tube evaporator is higher than dry evaporator heat transfer efficiency, has improved Energy Efficiency Ratio (COP value), and promptly energy is imported the ratio with energy output.
4. the multi-compressor unit can be shared one group of evaporimeter and condenser, still can effectively utilize heat during fractional load and pass area, so can have higher fractional load efficient.
5. compact conformation, floor space is little, good heat-transfer, it is comparatively convenient to make and install.
(4) description of drawings
Fig. 1 is a side-looking structure chart of the present invention.
Fig. 2 is main TV structure figure of the present invention.
Fig. 3 is a fundamental diagram of the present invention.
(5) specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is further described.
Embodiment one
With reference to Fig. 1,2,3, a kind of freezing dryer for compressed air comprises two forecoolers 1, two evaporimeters 2, two filtering type steam-water separators 3, automatic water trap 4, cold medium compressor 5, condenser 6, expansion valve 7 and oil removal filters 8.Described evaporimeter is the full liquid shell and tube evaporator 2 of the logical compressed air of tube side, the logical refrigerant of shell side, and expansion valve 7 is a throttling arrangement, also can substitute with the throttling arrangement of other types.Described forecooler 1, full liquid shell and tube evaporator 2, filtering type steam-water separator 3, automatic water trap 4 connects successively and form the compressed air closed circuit; Cold medium compressor 5, full liquid shell and tube evaporator 2, expansion valve 7 is connected successively with condenser 6 and form refrigerant circulation circuit.
The tube side of full liquid shell and tube evaporator 2 is walked air, and shell side is walked liquid refrigerants.Refrigerant is full of about 70% of the whole volume of shell side, and liquid level is steady, and the heat transfer temperature difference is 2 ℃, and the air conditioning condition evaporating temperature is 5 ℃, and outlet refrigerant superheat temperature is at 1.5~2 ℃.
Between two full liquid shell and tube evaporators 2, vertical setting in parallel between the forecooler 1, compact conformation, floor space are little.
The heat exchange copper tube of described full liquid shell and tube evaporator 2 and the heat exchange copper tube of described forecooler 1 all adopt the smooth wall copper pipe, and cost is low.Inner high tooth copper pipe or the finned tube template formula of adopting of traditional evaporimeter, forecooler adopts bellows, and cost is higher, and for example: a treating capacity is 30Nm 3The freezing type drier of/min, traditional evaporator shell adopts the GB8163 seamless steel pipe of DN250 barrel dliameter, length 1380mm, weight 127kg, copper pipe length 1100mm, the housing of the vertical flooded evaporator of weight 80kg. adopts the DN100 barrel dliameter, length 1550mm, weight 56kg, copper pipe length 1150mm, weight 30kg.Calculate as can be known by contrast, vertical flooded evaporator is saved seamless pipe 40%~50%, copper pipe 50%~60% than horizontal type dry evaporimeter.Vertical flooded evaporator is made easy for installation, and repair demolition is simple and direct, and production cost is low.
In addition, in environmental protection, adopting hfc refrigerant R407C or R134a is cold-producing medium.The ODP of R134a (ozone layer destroying coefficient) is zero and nontoxic, and GWP (to the global greenhouse effect coefficient) is 0.24~0.29, and chemical stability is good, does not burn; The tradition cooling driers adopts R22, and its ODP is 0.055, and GWP is 0.32~0.37.
The present invention is when work, saturated compressed air is entered in the forecooler 1 by air intlet 9, at first by the cold air precooling of coming out, and then enter in the full liquid shell and tube evaporator 2, in full liquid shell and tube evaporator 2, further cooling off by refrigerant from full liquid shell and tube evaporator 2.After the air cooling, airborne steam is condensed into the liquid water droplets of carrying dirt and oil secretly, drop be filtered subsequently that formula steam-water separator 3 separates and by automatic water trap 4 with outside its discharge machine, filtering type steam-water separator 3 can also be removed a large amount of liquid pollutants and the solid particle more than 3 microns simultaneously efficiently.Air dry, cooling turns back to forecooler 1, and the heat back is discharged outside the drying machine by air outlet slit 10 again.
Filtering type steam-water separator 3 adopts the import filter cores, can reach 100% to the filter efficiency of certain particle diameter water droplet.What the use at present of tradition freezing type drier was more is cyclone type moisture separator, and a kind of inertia separator of cyclone separator formula relatively is suitable for gas solid separation.After compressed air entered separator along the tube tangential direction, rotation inside was mixed in water droplet in the gas and also and then rotates together and produce centrifugal force.Because centrifugal force is directly proportional with quality, therefore, the centrifugal force sky of big water droplet causes the outside wall shift of big water droplet moving, and on outer wall, gather grow up also separated from the gas.And the less water droplet of particle diameter is under the gas pressure effect, to the central shaft migration that is negative pressure state.Because the existence of swirling eddy central negative nip, the less fine liquid particles of centrifugal force is very easily sucked forecooler by negative pressure, causes dew point to rise.If " steam-water separator " separative efficiency is low, a part of condensate water enters forecooler and double evaporation-cooling is reduced into steam, and compressed-air actuated water content will be improved greatly, and compressed-air actuated dew point is raise.For example: the 1Nm3 compressed air of 0.7Mpa temperature in cooling driers is reduced to 2 ℃ (water content 0.82g) from 10 ℃ (water content is 1.26g), and it is 6.44g that the condensation knot generates the water yield.If wherein 70% (4.51g) condensate water " spontaneous " in the gas flow process separate and the discharge machine outside, then also have the 1.93g condensate water to finish to catch and separate by " steam-water separator ".The separative efficiency 80% of " if steam-water separator ", then finally also have the aqueous water of 0.39g to enter forecooler with air, and double evaporation-cooling is reduced into steam, make the compressed air water vapour content be increased to 1.21g by the 0.82g that once reached, to rise to 8 ℃ this moment compressed-air actuated " pressure leak source ", and this is very disadvantageous.
Embodiment two
With reference to Fig. 1,2,3, also be provided with oil removal filter 8 on the compressed air closed circuit between described automatic water trap 4 and the full liquid shell and tube evaporator 2.Oil removal filter 8 can further remove and deoil and drop.All the other structures are identical with embodiment one with embodiment.
Embodiment three
With reference to Fig. 1,2,3, also be provided with oil removal filter 8 on the compressed air closed circuit between described automatic water trap 4 and the full liquid shell and tube evaporator 2.Oil removal filter 8 can further remove and deoil and drop.All the other structures are identical with embodiment two with embodiment.

Claims (7)

1. a freezing dryer for compressed air comprises forecooler, evaporimeter, steam-water separator, automatic water trap, cold medium compressor, condenser and throttling arrangement;
Described forecooler, evaporimeter, steam-water separator, automatic water trap connect successively and form the compressed air closed circuit; Described cold medium compressor, evaporimeter, throttling arrangement and condenser are connected successively and form refrigerant circulation circuit;
It is characterized in that: described evaporimeter is the full liquid shell and tube evaporator that leads to refrigerant in the tube side in logical compressed air, the shell side.
2. freezing dryer for compressed air as claimed in claim 1 is characterized in that: described full liquid shell and tube evaporator, forecooler have two, between the full liquid shell and tube evaporator, vertical setting in parallel between the forecooler.
3. freezing dryer for compressed air as claimed in claim 2 is characterized in that: the heat exchange copper tube of described full liquid shell and tube evaporator and the heat exchange copper tube of described forecooler all adopt the smooth wall copper pipe.
4. as the described freezing dryer for compressed air of one of claim 1~3, it is characterized in that: described steam-water separator is the filtering type steam-water separator.
5. as the described freezing dryer for compressed air of one of claim 1~3, it is characterized in that: the compressed air closed circuit between described automatic water trap and the full liquid shell and tube evaporator is provided with oil removal filter.
6. freezing dryer for compressed air as claimed in claim 4 is characterized in that: also be provided with oil removal filter on the compressed air closed circuit between described automatic water trap and the full liquid shell and tube evaporator.
7. freezing dryer for compressed air as claimed in claim 1 is characterized in that: described throttling arrangement is an expansion valve.
CNB2006100504704A 2006-04-21 2006-04-21 A freezing dryer for compressed air Expired - Fee Related CN100436992C (en)

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Application Number Priority Date Filing Date Title
CNB2006100504704A CN100436992C (en) 2006-04-21 2006-04-21 A freezing dryer for compressed air

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CN100436992C true CN100436992C (en) 2008-11-26

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Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7635409B2 (en) * 2007-03-09 2009-12-22 Skf Usa Inc. Air dryer systems
CN102163044B (en) * 2010-12-22 2012-07-25 浙江工业大学 Variable-frequency controller of air compressor-refrigeration drier system
CN102553288B (en) * 2012-02-17 2014-04-16 核工业理化工程研究院华核新技术开发公司 Energy-saving air pretreatment system for separate type heat pipe
CN106091737B (en) * 2016-06-16 2018-01-02 吉首大学 A kind of drum-type colds and heat succeed each other salting apparatus
CN108120227A (en) * 2017-12-04 2018-06-05 珠海格力电器股份有限公司 A kind of compressed air drying and water manufacturing system and method

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2216858Y (en) * 1994-06-28 1996-01-10 冶金工业部重庆钢铁设计研究院 Combination type equipment for purifying compressed air
CN2272996Y (en) * 1996-11-26 1998-01-21 无锡市盛达气源净化设备有限公司 Frozen compressed air dryer
CN2305634Y (en) * 1997-08-07 1999-01-27 杭州汉业气源净化设备有限公司 Low dew point refrigerating compressed air drier
CN2520934Y (en) * 2002-01-16 2002-11-20 北京市康孚环境控制公司 Steam-water separator
CN2611840Y (en) * 2003-03-21 2004-04-14 十堰邦本科工贸有限公司 Cool storage compressed air freezing dryer
CN2919148Y (en) * 2006-04-21 2007-07-04 程成 Air-compressed freeze drying machine

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2216858Y (en) * 1994-06-28 1996-01-10 冶金工业部重庆钢铁设计研究院 Combination type equipment for purifying compressed air
CN2272996Y (en) * 1996-11-26 1998-01-21 无锡市盛达气源净化设备有限公司 Frozen compressed air dryer
CN2305634Y (en) * 1997-08-07 1999-01-27 杭州汉业气源净化设备有限公司 Low dew point refrigerating compressed air drier
CN2520934Y (en) * 2002-01-16 2002-11-20 北京市康孚环境控制公司 Steam-water separator
CN2611840Y (en) * 2003-03-21 2004-04-14 十堰邦本科工贸有限公司 Cool storage compressed air freezing dryer
CN2919148Y (en) * 2006-04-21 2007-07-04 程成 Air-compressed freeze drying machine

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