The utility model discloses an add high temperature gas gas heater's zero release urea pyrolysis system, the urea solution entry of spray gun is linked together in the export of the urea solution of urea solution metrological control module and the pyrolysis oven, the export of pyrolysis oven is linked together with the ammonia injection grid in the flue, it is linked together to dilute the export of wind input pipeline and gas gas heater's endothermic side entrance, gas gas heater's the entry of inhaling heat side outlet and pyrolysis oven is linked together, furnace's exhanst gas outlet is linked together with gas gas heater's exothermic side entrance, gas gas heater's the heat side outlet of putting send the income wind gap of the general right type powder process system of whitewashed bituminous coal meager coal to be linked together with the hot -blast complex of weary gas, the weary hot -blast complex of gas send the export of the general right type powder process system of whitewashed bituminous coal meager coal and furnace's entry to be linked together, this system can be with discharging behind the high temperature flue gas denitration after the heat transfer again, and need not increase extra denitrification facility newly.