US 12,241,626 B2
Method and device for flameless stepwise combustion
Joachim G. Wünning, Leonberg (DE); and Joachim A. Wünning, Leonberg (DE)
Assigned to WS-WÄRMEPROZESSTECHNIK GMBH, Renningen (DE)
Appl. No. 17/292,810
Filed by WS-WÄRMEPROZESSTECHNIK GMBH, Renningen (DE)
PCT Filed Nov. 8, 2019, PCT No. PCT/EP2019/080635
§ 371(c)(1), (2) Date May 11, 2021,
PCT Pub. No. WO2020/099254, PCT Pub. Date May 22, 2020.
Claims priority of application No. 18205667 (EP), filed on Nov. 12, 2018.
Prior Publication US 2022/0026058 A1, Jan. 27, 2022
Int. Cl. F23C 6/04 (2006.01); F23N 1/02 (2006.01); F23C 9/00 (2006.01)
CPC F23C 6/042 (2013.01) [F23N 1/02 (2013.01); F23C 9/006 (2013.01); F23C 2900/99001 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A method for heating a heating chamber (12), comprising:
heating the heating chamber (12) to a temperature below a spontaneous ignition temperature of a fuel used to heat the heating chamber;
reacting fuel and air in flameless oxidation in a non-stoichiometric ratio in a combustion chamber (11); and
supplying the fuel and air in the heating chamber (12) as a reaction gas without heat withdrawal from the combustion chamber (11) apart from non-avoidable thermal losses;
wherein the reaction gas is completely oxidized in the heating chamber (12), by adding air and/or fuel as necessary;
wherein a temperature between 1000° C. and 1300° C. is achieved in the combustion chamber (11) by adjustment or closed loop control of a fuel/air ratio.