The invention relates to the explosion-prevention and energy-saving field of the surface treatment of steel plate and the hot air thermo curing of
coating, in particular to a method and a device for the
inert gas hydronic heating and the curing of a colorful steel plate. The method comprises the following procedures: the
coating is cured by heating in a hot-air curing oven; after fuel is burned, air is heated by
flue gas through a
heat exchanger and blown into a curing oven by a blast blower for heating band steel; the
coating is cured; the
fuel gas ratio of a burning furnace and a
combustion furnace is controlled to control the
oxygen content of
waste gas below 12 per cent; the
oxygen content of
waste gas is automatically analyzed, which interlocks with an automatic air-flow control and an automatic alarm
system; and an
air knife is used for separating the gas in the oven to realize
interlocking automatic control and automatic starting emergency. The device comprises a
natural gas pipe line, the
combustion furnace, the burning furnace, a
combustion air
pipe line, a heat interchanger, a circulating fan, a coating curing oven, an automatic analyzer for
oxygen content, a temperature
measuring equipment, a pressure measuring unit, a trip valve, the
air knife and a
interlocking control device. The fuel and the
discharge amount of
carbon dioxide can be saved in half. And in proportion as the fuel and the
discharge amount is saved, the
power consumption of a blower decreases.