Thermal test system and method for simulating non-toxic HAN fuel gas generator

The invention relates to a thermal test system and method for simulating a non-toxic HAN fuel gas generator, and the system comprises a propellant supply unit, a fuel gas generator, a cooling unit, a buffer tank, a buffer tank pressurizing unit, and an attitude and orbit control engine consumption simulation unit. The output end of the propellant supply unit is connected with the fuel gas generator through a pipeline with a normally-open valve, a propellant blowing-off branch is arranged on the pipeline where the output end of the propellant supply unit is connected with the fuel gas generator, and the output end of the propellant blowing-off branch is connected with the pressure adjusting end of the propellant supply unit. The output end of the fuel gas generator is connected with the buffer tank after passing through the cooling unit, the output end of the buffer tank is connected with each attitude and orbit control engine consumption simulation unit, a pressure sensor for measuring pressure data in the bu