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How can it happen? How do R22 and R717 react in the system? What will be the symptoms on the system? How do we solve the problem if R22 gets into a R717.

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Presentation on theme: "How can it happen? How do R22 and R717 react in the system? What will be the symptoms on the system? How do we solve the problem if R22 gets into a R717."— Presentation transcript:

1 How can it happen? How do R22 and R717 react in the system? What will be the symptoms on the system? How do we solve the problem if R22 gets into a R717 system? How do we avoid R22 gets into the system? R22 polution of R717 refrigeration systems ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

2 During service and maintenance: Using the same hoses, containers, tools and pressure vessels when working on both R22 and R717 systems When second hand components from R22 systems are fitted on R717 systems Accidents, where the wrong refrigerant is charged to the system Direct from the supplier of refrigerant: Supplier can use same charging system for R22 and R717 Pressure vessels used for both R22 and R717 When changing refrigerant: Failing to get all oil and R22 out of a system which is changed to R717. How can R22 get into a R717 refrigeration system? ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

3 How do R22 and R717 react in a R717 system? Reactions will take place where R717 is in the liquid phase: R22 + R717 => AMMONIUM + AMMONIUM + AMMONIUM CYANIDE CHLORIDE FLOURIDE CHClF 2 + 5NH 3 => NH 4 CN + NH 4 Cl + 2NH 4 F Will react with iron Dissolves in NH 3 liquid Colorless crystals Colorless Very corrosive crystals Precipitates NB: Reaction products are aggressive or very poisonous ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

4 Ammoniacyanide will react with iron in the system R22 + R717 + IRON => AMMONIUM + AMMONIUM + AMMONIUM + HYDROGEN FERROCYANIDE CHLORIDE FLOURIDE 6CHClF 2 +28NH 3 +Fe =>(NH 4 ) 4 Fe(CN) 6 + 6NH 4 Cl + 12NH 4 F + H 2 Dissolves in Dissolves Colorless Non- NH 3 liquid. in NH 3 liquid Crystals conden- Yellow color. Corrosive Precipitates sible gas Color change slowly to grey/blue when ex- posed to air. NB: Reaction products are aggressive or very poisonous ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

5 Ammoniumferrocyanide can react further: R22 + R717 + IRON => IRONBLUE + AMMONIUM + AMMONIUM + HYDROGEN CHLORIDE FLOURIDE 18CHCLF 2 +72NH 3 +7Fe => Fe 4 (Fe(CN) 6 ) 3 + 18NH 4 Cl + 36NH 4 F + 9H 2 Crystals Dissolves Colorless Non Strong blue in NH 3 liquid crystals condens- Precipitates Corrosive Precipitates ible gas NB: Reaction products are aggressive or very poisonous ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

6 How much is created? Every kg R22 in a R717 system will create : 0,62 kg AMMONIUMCHLORIDE NH 4 Cl 0,86 kg AMMONIUMFLOURIDE NH 4 F 1 kg R22 => AMMONIUMFERROCYANIDE (NH 4 ) 4 Fe(CN) 6 IRONBLUE Fe 4 Fe(CN) 6 0,004-0,012 kg HYDROGEN H 2 0,55 kg ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

7 Where do the reaction products settle? AMMONIUMFLOURIDE Settles as crystals in the NH 3 liquid where NH 4 F they are created, mainly in high pressure IRONBLUE receiver and high pressure liquid line. Fe 4 (Fe(CH 6 )) 3 HYDROGEN H 2 Assembles as non condensible gas in condenser and / or receiver AMMONIUMCHLORIDE Settles as porous crystals where NH 3 NH 4 Cl liquid evaporates, mainly in expansion AMMONIUMFERROCYANIDEdevices and evaporators (NH 4 ) 4 Fe(CN) 6 ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

8 Secondary Effects In the presense of zinc, Zincammoniumchloride Zn(NH 3 ) 2 Cl will be created: Zincammoniumchloride Zn(NH 3 ) 2 Cl Have a flux effect => reactive surfaces on metals AmmoniumchlorideCreates a very corrosive environment NH 4 Cl Valves, regulators etc. can get stuck du to excessive corrosion. ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

9 Excessive Corrosion Pistons from PM valves exposed in two weeks to the corrosive environment of a R22 poluted R717 system. ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

10 Practical examples of damage on systems Pump damage Blue coloring and corrosion Blue coloring Blocked by corrosion Check valves blocked Compressor bearing break down Blue coloring Pipe blocked Housing filled with sludge Sludge Blue coloring Big amount of sludge Sludge Pipes and valves totally blocked ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

11 How to clean the system? AMMONIUMCHLORIDE NH 4 Cl: Dissolves in water AMMONIUMFLOURIDE NH 4 F Dissolves in cold water and AMMONIUMFEEROCYANIDE decompose in hot water (NH 4 ) 4 Fe(CN) 6 IRONBLUE Fe((Fe(CH 6 )) 3 : Will not dissolve in water, mechanical cleaning necessary Corrosion products:Mechanical cleaning NB: Reaction products are aggressive or very poisonous ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C

12 Conclusions: R22 pollution of R717 systems can happen The quantity of reaction products is high Very corrosive environments can be created in the plant Valves, filters, controls and pipes can get blocked Compressors and NH 3 pumps can be damaged Valves and controls can get stuck in corrosion System cleaning difficult and expensive ooling M. Sc. Mech. Per Skærbæk Nielsen, +45 28720673, +45 721990, skaer@mail.dk, ww.coolingconsult.com onsult Bjødstrupvej 77, 8310 Tranbjerg, Denmark, CVR: 28445415 C C


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