Effects of Ammonia Substitution On Stability Limits and Emissions of Premixed Hydrogen/Air Flames

Catalysis and Reaction Engineering Division
2011 AIChE Annual Meeting
AIChE Annual Meeting
October 19, 2011 - 8:00pm

The potential of partial ammonia (NH3) substitution to improve the safety of hydrogen (H2) use was evaluated, using premixed NH3/H2/air flames at normal temperature and pressure generated on a tube type burner. The effects of NH3 substitution on the stability limits and nitrogen oxide (NOx) emissions of premixed H2/air flames and the effects of inert (nitrogen, N2) coflows on the NH3-substituted H2/air flames were investigated. The lower stability limits due to heat losses are observed for all the present test conditions, while the upper stability limits due to insufficient residence times of injected mixture jet are observed for limited test conditions. Results also show reduction of the stability limits with NH3 substitution in H2/air flames, supporting the potential of NH3 as a carbon-free, clean additive for improving the safety of H2 use in premixed H2/air flames. Opposite tendencies of the upper stability limits with and without the coflow are observed since nonpremixed flames near the burner exit cannot be generated with the coflow. Ammonia substitution enhances the NOx formation in general; however, the NOx emission index that is defined as the fraction of the mass of the produced NOx per the mass of the provided NH3 and H2 is almost constant with the enhanced ammonia substitution. At fuel-rich conditions, the NOx emission index is reduced with increasing burner exit velocities of the injected mixtures.

Please Note: Members of the Catalysis and Reaction Engineering Division of AIChE are entitled to this content for free. Simply enter the 'promo code' CRECOD when you are checking out. Only AIChE members are entitled to join the Catalysis and Reaction Engineering Division. For more info please click here. click here
Professional Development Hours
0.5 PDHs
You will be able to download and print a certificate for these PDH credits once the content has been viewed. If you have already viewed this content, please click here to login.

Would you like to access this content?

No problem. You just have to complete the following steps.

You have completed 0 of 2 steps.

  1. Log in

    You must be logged in to view this content. Log in now.

  2. Purchase Technical Presentation

    You must purchase this technical presentation using one of the options below.
    If you already purchased this content recently, please click here to refresh the system's record of ownerships.


Credits 0.5 Use credits
List Price $25.00 Buy now
AIChE Members $15.00 Buy now
AIChE Undergraduate Student Members Free Free access
AIChE Graduate Student Members Free Free access