Introduction to liquid ammonia refrigerant

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Time of issue:2021-07-01
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(Summary description)Liquidammonia(NH3),alsoknownasanhydrousammonia,isobtainedbypressurizingorcoolingammonia.Itisacommonrefrigerantinfresh-keepingcabinets.Thepressureofammoniarefrigerantincondenserandevaporatorismoderate(condensationpressureisgenerally0.981mpa,evaporationpressureisgenerally0.098-0.49mpa);TherefrigeratingcapacityperunitvolumeislargerthanthatofCFC-12andHCFC-22;Ithasgoodthermodynamiccharacteristicsandexcellentenvironmentalprotectionperformance,highrefrigerationcoefficientandlargeheatreleasecoefficient.Whenthesametemperatureandrefrigerationcapacityarethesame,thesizeofammoniacompressoristhesmallest. Moreover,ammoniarefrigeranthasmaturesynthesisprocess,easypreparation,lowpriceandissuitableforlarge-scaleuse.Therefore,amongallkindsofrefrigerants,liquidammoniaisthefirstchoiceforrefrigerationinmostindustrialenterprisesandiswidelyusedinindustry,largecoldstorageandsupermarketfooddisplaycabinets. Ammoniarefrigerantisflammableandtoxic.Itcorrodeszinc,copperandbronzealloys(exceptphosphorbronze)andhasapungentsmellafterencounteringwater.Therefrigerationsystemusingammoniaasrefrigerantneedstohavetwocharacteristics:safety,perfectsealingsystem,leakdetectionsystemandperfectalarmsystem.Corrosionresistance.Inammoniarefrigerationunit,copperandcopperalloymaterialscannotbeusedforpipes,instrumentsandvalves. Ammoniarefrigerantcanbewidelyusedinrefrigerationsystemsoflargeandmedium-sizedcoldstoragesandchemicalrefrigerationsystemstocooldownthroughvaporcompressionrefrigeration.Ammoniarefrigerantisalsoflammable,toxicandcorrosive.Whentheconcentrationofammoniaintheairreaches16%-23%,itwillimmediatelycauseexplosionincaseofopenfire.Therefore,oncetheliquidammonialeaks,therewillbemajorpotentialsafetyhazards.Althoughammoniadoeshavethedisadvantagesofflammabilityandtoxicity,itsusetechnologyhasbeenverymature,anditssafetycanbeguaranteed. Ammoniarefrigeranthasbeenusedintheworldformorethan150years.ItistheearliestrefrigerantusedinrefrigerationinChina.Ithasahistoryof50or60yearsinChinaandiswidelyusedallovertheworld.Itsinstallation,operationandSafetyspecificationshaveformedacompletesystem.Ammoniarefrigerantisnowusedinmanylargefactories,buildingsandcoldstorages.Ifitisoperatedproperlyandinfullaccordancewiththerules,thereisnoneedtoworryaboutsafetyatall.Thecapitalgymnasiumbuiltin1968isusingammoniasystemforrefrigeration,andtherearestillnopotentialsafetyhazardsforsomanyyears.

武汉群星明供应链管理股份有限公司

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Introduction to liquid ammonia refrigerant

(Summary description)Liquidammonia(NH3),alsoknownasanhydrousammonia,isobtainedbypressurizingorcoolingammonia.Itisacommonrefrigerantinfresh-keepingcabinets.Thepressureofammoniarefrigerantincondenserandevaporatorismoderate(condensationpressureisgenerally0.981mpa,evaporationpressureisgenerally0.098-0.49mpa);TherefrigeratingcapacityperunitvolumeislargerthanthatofCFC-12andHCFC-22;Ithasgoodthermodynamiccharacteristicsandexcellentenvironmentalprotectionperformance,highrefrigerationcoefficientandlargeheatreleasecoefficient.Whenthesametemperatureandrefrigerationcapacityarethesame,thesizeofammoniacompressoristhesmallest. Moreover,ammoniarefrigeranthasmaturesynthesisprocess,easypreparation,lowpriceandissuitableforlarge-scaleuse.Therefore,amongallkindsofrefrigerants,liquidammoniaisthefirstchoiceforrefrigerationinmostindustrialenterprisesandiswidelyusedinindustry,largecoldstorageandsupermarketfooddisplaycabinets. Ammoniarefrigerantisflammableandtoxic.Itcorrodeszinc,copperandbronzealloys(exceptphosphorbronze)andhasapungentsmellafterencounteringwater.Therefrigerationsystemusingammoniaasrefrigerantneedstohavetwocharacteristics:safety,perfectsealingsystem,leakdetectionsystemandperfectalarmsystem.Corrosionresistance.Inammoniarefrigerationunit,copperandcopperalloymaterialscannotbeusedforpipes,instrumentsandvalves. Ammoniarefrigerantcanbewidelyusedinrefrigerationsystemsoflargeandmedium-sizedcoldstoragesandchemicalrefrigerationsystemstocooldownthroughvaporcompressionrefrigeration.Ammoniarefrigerantisalsoflammable,toxicandcorrosive.Whentheconcentrationofammoniaintheairreaches16%-23%,itwillimmediatelycauseexplosionincaseofopenfire.Therefore,oncetheliquidammonialeaks,therewillbemajorpotentialsafetyhazards.Althoughammoniadoeshavethedisadvantagesofflammabilityandtoxicity,itsusetechnologyhasbeenverymature,anditssafetycanbeguaranteed. Ammoniarefrigeranthasbeenusedintheworldformorethan150years.ItistheearliestrefrigerantusedinrefrigerationinChina.Ithasahistoryof50or60yearsinChinaandiswidelyusedallovertheworld.Itsinstallation,operationandSafetyspecificationshaveformedacompletesystem.Ammoniarefrigerantisnowusedinmanylargefactories,buildingsandcoldstorages.Ifitisoperatedproperlyandinfullaccordancewiththerules,thereisnoneedtoworryaboutsafetyatall.Thecapitalgymnasiumbuiltin1968isusingammoniasystemforrefrigeration,andtherearestillnopotentialsafetyhazardsforsomanyyears.

Categories:新闻资讯
Author:
Origin:
Time of issue:2021-07-01
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Liquid ammonia (NH3), also known as anhydrous ammonia, is obtained by pressurizing or cooling ammonia. It is a common refrigerant in fresh-keeping cabinets. The pressure of ammonia refrigerant in condenser and evaporator is moderate (condensation pressure is generally 0.981mpa, evaporation pressure is generally 0.098-0.49mpa); The refrigerating capacity per unit volume is larger than that of CFC-12 and HCFC-22; It has good thermodynamic characteristics and excellent environmental protection performance, high refrigeration coefficient and large heat release coefficient. When the same temperature and refrigeration capacity are the same, the size of ammonia compressor is the smallest.

Moreover, ammonia refrigerant has mature synthesis process, easy preparation, low price and is suitable for large-scale use. Therefore, among all kinds of refrigerants, liquid ammonia is the first choice for refrigeration in most industrial enterprises and is widely used in industry, large cold storage and supermarket food display cabinets.

Ammonia refrigerant is flammable and toxic. It corrodes zinc, copper and bronze alloys (except phosphor bronze) and has a pungent smell after encountering water. The refrigeration system using ammonia as refrigerant needs to have two characteristics: safety, perfect sealing system, leak detection system and perfect alarm system. Corrosion resistance. In ammonia refrigeration unit, copper and copper alloy materials cannot be used for pipes, instruments and valves.

Ammonia refrigerant can be widely used in refrigeration systems of large and medium-sized cold storages and chemical refrigeration systems to cool down through vapor compression refrigeration. Ammonia refrigerant is also flammable, toxic and corrosive. When the concentration of ammonia in the air reaches 16% - 23%, it will immediately cause explosion in case of open fire. Therefore, once the liquid ammonia leaks, there will be major potential safety hazards. Although ammonia does have the disadvantages of flammability and toxicity, its use technology has been very mature, and its safety can be guaranteed.

Ammonia refrigerant has been used in the world for more than 150 years. It is the earliest refrigerant used in refrigeration in China. It has a history of 50 or 60 years in China and is widely used all over the world. Its installation, operation and Safety specifications have formed a complete system. Ammonia refrigerant is now used in many large factories, buildings and cold storages. If it is operated properly and in full accordance with the rules, there is no need to worry about safety at all. The capital gymnasium built in 1968 is using ammonia system for refrigeration, and there are still no potential safety hazards for so many years.

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