Combustion controller for combustible gas

A nuclear power plant exhaust system comprising:

• a chimney comprising at least one chimney wall that defines a chimney channel with a chimney inlet and a chimney outlet, wherein the chimney inlet is connected to an exhaust outlet of a nuclear reactor containment structure and configured to receive, from the exhaust outlet, an exhaust gas comprising a combustible component;
• a combustion apparatus installed inside the chimney channel and comprising a support frame, a plurality of recombiners, and a quenching mesh;
• the support frame comprising at least one sidewall that defines a hollow channel extending along and inside the chimney channel and that also separates the hollow channel from a chimney space that is inside chimney channel but outside the hollow channel;
• a first one of the plurality of recombiners installed inside the hollow channel over the quenching mesh and comprising a recombiner mesh and a combustion catalyst coated on the recombiner mesh, wherein the first recombiner is configured to burn at least part of the combustible component contained in the exhaust gas flowing in the hollow channel as the exhaust gas passes through the recombiner mesh;
• the quenching mesh installed inside the hollow channel under the first recombiner;
• and
• at least one hole formed between the quenching mesh and the first recombiner through the at least one sidewall of the support frame and configured to allow air introduction into the hollow channel therethrough.