Fuel,air and diluted gas mixed gas spontaneous combustion and ignition on-fire test device

The invention relates to a fuel, air and diluted gas mixed gas spontaneous combustion and ignition on-fire test device which comprises a fuel supply system, an air supply system, a diluted gas supply system, a mixed gas preheating and mixing system, a combustion chamber and a gas exhaust and sampling system. The fuel supply system, the air supply system and the diluted gas supply system are used for achieving the beneficial effect of preparation of mixed gas with three components, namely fuel, air and diluted gas; a heating ring heats the mixed gas to enable the mixed gas to be spontaneously combusted so as to research the spontaneous combustion on-fire characteristic of the fuel, and external energy is injected to the mixed gas through an electrode to research the ignition on-fire characteristic of the fuel; by the arrangement of a stirrer, the beneficial effect of relative uniformity of concentration field-temperature field of the mixed gas is achieved.