Dissociateur ammoniac, générateur hydrogène pour le production de hydrogène et azote
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Séparateur d'Ammoniac. Générateur de gaz composé.

It is well known that hydrogen is indispensable for the bright hardening of many kinds of metals. But, viewed from the standpoint of economy and safety hydrogen gas is by no means an advantageous atmosphere. Dissociated ammonia atmosphere or "forming gas" is the only furnace atmosphere that can make up the demerits of hydrogen and function nearly 100% as if it were hydrogen gas. There are cases where forming gas cannot replace pure hydrogen, but such cases are very rare. For almost all applications involved, dissociated ammonia atmosphere will answer the purpose.

Ce dispositif  dissociateur ammoniac, NH₃-Cracker ou générateur hydrogène est utilisé pour la fabrication d'un gaz composé N₂/H₂. Hydrogène et Azote sont produits dans des proportions de volume de 3 : 1 et de masse de 14 : 3.

The NH₃ is coming from bottles or from an ammonia tank. The ammonia gas is pre-heated in a heat exchanger and vaporizer and then cracked in the main furnace unit. The furnace is electrically heated by special LGO heating elements.

The dissociation of ammonia gas NH₃ takes place at a temperature of 920°C in the presence of a special nickel catalyst in an electrically heated furnace.
2 NH₃  N₂ + 3 H₂
The cracked gas then passes the heat exchanger for cooling and for pre-heating the incoming gas. This way and in combination with the low power consuming LGO heating elements, it can be made sure that only a minimum of electricity has to be used for the cracking process.

AM Gas Generator. Features: Light thermal mass heater: Comparing to conservative type brick furnace, there is lots of reduction in heat-up time, power consumption, foot print. Stable gas generation: Tube type retort integrated in round electrical heater can generate cracking gas stable. Safety feature: Excess temperature protection, over pressure, thermocouple burnt alarm, etc can maintain the system safe. Save foot print, easy operation: Operation switch install on front panel. Insulator got thinner and can realize less foot print.

As a result of complete dissociation into hydrogen and nitrogen, very little undissociated ammonia remains and the dew point temperature of the resulting gas is very low (well below -30°C).

Gas Purifier

As an option and in order to reduce the dew point of the generated forming gas further, a special forming gas purifier is available from Koyo Thermo Systems. Using molecular sieve technology, the dew point of the generated gas can be reduced to less than -65°C. Two adsorber units are working in parallel, one for adsorbing moisture and un-cracked ammonia from the forming gas and the other one is heated for regeneration. Every 6 h the gas flow is changed automatically.

Applications for dissociated ammonia

Le gaz composé est utilisé dans les fours à passage et dans les fours à tubes pour des procédés de recuit sous atmosphère réductrice. Vous trouverez de plus amples détails sur ces fours en vous référant au paragraphe product overview dans la rubrique Koyo Thermo Systems.

Brazing Sintering Deoxidization Nitrization

Metal anneal: Stainless steel wire anneal Metal powder anneal Bimetal products anneal

Hydrogenation of organic compounds Galvanization Production of Forming Gas

Gas Properties

Description	Ammonia NH3	Hydrogen H2	Nitrogen N2
Molecular Weight	17,03	2,0158	28,0134
Boiling Point (BP) in °C	-33,35	-252,87	-195,8
Liquid Density at BP in kg/m3	682,1	70,0	804,0
Vapor Density at BP in kg/m3	0,8906	1,329	4,613
Density at RT in kg/m3	0,7710	0,0899	1,2506
Heat of Vaporization in kJ/kg	1368,2	451,9	199,2
Solubility in cold water in g/100ml	89,9	-	-
Cp in kJ/kg (1 atm, RT)	2,188	14,2	1,038
Cp/Cv (1 atm, RT)	1,31	1,41	1,40

AM Product types

MODEL	Generation capacity (m3/h H2/N2)	Ammonia consumption (m3/h NH3)	Power requirement (kW at 220V)	Dimension W X D X H (mm)
AM- 5MT	5	2,5	11	1400 X 840 X 1750
AM- 10MT	10	5	16.5	1450 X 840 X 2150
AM- 15MT	15	7,5	18	1450 X 900 X 2700
AM- 20MT	20	10	26	1650 X 900 X 2500
AM- 30MT	30	15	28.5	1650 X 900 X 2700
AM- 40MT	40	20	52	2500 X 1000 X 2500
AM- 60MT	60	30	59.5	2800 X 1000 X 2900

For the production of larger amounts of forming gas, several units can be installed in parallel.

Koyo Thermo Systems et Crystec sont prêts à étudier pour vous, le système qui répondra à vos exigences en présentant le meilleur rapport qualité / prix.

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