Operating a feedstock reactor

A system comprising:

• a feedstock reactor comprising a reaction chamber connected to multiple combustors;
• one or more controllers configured to control valving to:
• for each reaction cycle in a sequence of reaction cycles:
• load one or more combustors of the multiple combustors with a combustible gas mixture;
• and
• trigger a number of igniters to combust the combustible gas mixture in a number of the multiple combustors, thereby producing combustion products that flow into the reaction chamber,
• wherein, for at least a first reaction cycle and a second reaction cycle in the sequence of reaction cycles, the second reaction cycle occurring after the first reaction cycle, at least one of:
• the number of the combustors in which the combustible gas mixture is combusted is greater in the second reaction cycle than in the first reaction cycle;
• and
• an equivalence ratio of the combustible gas mixture loaded into the one or more combustors is higher in the second reaction cycle than in the first reaction cycle.