Combustor and combustion system

The utility model relates to a combustor and a combustion system. The combustor comprises an outlet; the air-coal inlet is configured to introduce pulverized coal and primary air; the air-coal channel comprises an inlet end and an outlet end which are communicated with the air-coal inlet; the ammonia fuel nozzle is communicated with the air-coal channel so as to mix the ammonia fuel output by the ammonia fuel nozzle with the pulverized coal in the air-coal channel; the ignition source is arranged in the air-coal channel so as to ignite pulverized coal and ammonia fuel in the air-coal channel; one end of the combustion cylinder is communicated with the outlet end of the air-coal channel, the other end of the combustion cylinder is communicated with the outlet, and pulverized coal and ammonia fuel are rapidly ignited and co-combusted under the action of the ignition source and have high-proportion ammonia mixing adaptability; the combustor can create a fuel-rich reducibility area in the initial stage of combust