O2/fuel ratio changes
03-11-2009, 05:30 PM,
#1
O2/fuel ratio changes
Need a lil help on changing the o2/fuel ratio and its impact.

If I go from a o2/fuel ratio of 3.37 down to 2.52 I am lowering flame temperature, lowering the combustion pressure and slowing down the particle velocity? Is that correct?

When calculating the o2/fuel ratio, do you typically include the compressed air along with the o2?

Thanks for any help Smile
Reply
03-11-2009, 06:57 PM,
#2
RE: O2/fuel ratio changes
Hi Intel55

What is the fuel and equipment?
Reply
03-11-2009, 07:48 PM,
#3
RE: O2/fuel ratio changes
(03-11-2009, 06:57 PM)Gordon Wrote: Hi Intel55

What is the fuel and equipment?

DJ2700. CH4 (nat gas).
Reply
03-12-2009, 02:36 PM,
#4
RE: O2/fuel ratio changes
(03-11-2009, 07:48 PM)Intel55 Wrote:
(03-11-2009, 06:57 PM)Gordon Wrote: Hi Intel55

What is the fuel and equipment?

DJ2700. CH4 (nat gas).

Ok I have a good idea about this, I use CH4 on CDS HVOF gun.

stoichiometry at 1 for CH4 is 1 CH4 for 2 O2

In theory, higher temperature is for stoichiometry at 0.9, on CDS it is more near 1.1 or 1.2 probably because this gun have no combustion chamber. If you have less or more than this value, the temperature down. Generally it is better have more O2.

Lower pressure you have slow particles are.

I can't said more.
Reply
03-13-2009, 03:53 AM,
#5
RE: O2/fuel ratio changes
(03-12-2009, 02:36 PM)landemarre Wrote:
(03-11-2009, 07:48 PM)Intel55 Wrote:
(03-11-2009, 06:57 PM)Gordon Wrote: Hi Intel55

What is the fuel and equipment?

DJ2700. CH4 (nat gas).

Ok I have a good idea about this, I use CH4 on CDS HVOF gun.

stoichiometry at 1 for CH4 is 1 CH4 for 2 O2

In theory, higher temperature is for stoichiometry at 0.9, on CDS it is more near 1.1 or 1.2 probably because this gun have no combustion chamber. If you have less or more than this value, the temperature down. Generally it is better have more O2.

Lower pressure you have slow particles are.

I can't said more.

Thanks for the info. I am still a lil confused. My Sulzer parameter for 5847 (86/10/4) calls for a o2/fuel ratio of 3.37. I am wondering if I go to a 3.0 or lower and keep the 40 gr/min and 250mm spray distance the same, what effect this will have on the coating. Will the increase of O2 increase flame temperature and particle velocity?
Reply
03-13-2009, 10:11 AM,
#6
RE: O2/fuel ratio changes
(03-13-2009, 03:53 AM)Intel55 Wrote:
(03-12-2009, 02:36 PM)landemarre Wrote:
(03-11-2009, 07:48 PM)Intel55 Wrote:
(03-11-2009, 06:57 PM)Gordon Wrote: Hi Intel55

What is the fuel and equipment?

DJ2700. CH4 (nat gas).

Ok I have a good idea about this, I use CH4 on CDS HVOF gun.

stoichiometry at 1 for CH4 is 1 CH4 for 2 O2

In theory, higher temperature is for stoichiometry at 0.9, on CDS it is more near 1.1 or 1.2 probably because this gun have no combustion chamber. If you have less or more than this value, the temperature down. Generally it is better have more O2.

Lower pressure you have slow particles are.

I can't said more.

Thanks for the info. I am still a lil confused. My Sulzer parameter for 5847 (86/10/4) calls for a o2/fuel ratio of 3.37. I am wondering if I go to a 3.0 or lower and keep the 40 gr/min and 250mm spray distance the same, what effect this will have on the coating. Will the increase of O2 increase flame temperature and particle velocity?

You will have flame temperature higher (for the same pressure) so higher temperature particles (or more oxydation) but have same particles velocity (or near the same). So coating should have less unmelt particles or more oxydation, probably more dense and perhaps more strength on it.
Reply




Possibly Related Threads…
Thread Author Replies Views Last Post
  Why Liquid fuel is better than Gas fuel in HVOF? dibyendudhara 3 10,796 12-30-2013, 02:36 PM
Last Post: derek
Sad Stoichiometric ratio calculation for JP 5000 Lalit 3 4,771 06-13-2013, 07:33 PM
Last Post: Intel55
  Stoichiometric fuel ratio =λ Met.Eng. 1 8,528 01-14-2011, 08:44 PM
Last Post: Gordon
  The ratio of oxygen to fuel of Jet kote III wangqun72 5 7,525 09-02-2010, 06:18 PM
Last Post: wangqun72
  Fuel for HVOF Panf 15 18,259 02-11-2008, 04:54 PM
Last Post: Stuart Milton



Users browsing this thread: 1 Guest(s)





Surface Engineering Forum Sponsor - Alphatek Hyperformance Coatings Ltd