Oil-fired natural gas hot air environmental protection boiler

Abstract

The invention relates to the field of boilers, in particular to an environment-friendly air heating boiler burning oil and natural gas. A boiler furnace, a back combustion chamber and a hot air jacket are arranged in a lower boiler body. The two ends of the boiler furnace are connected with a combustor and the back combustion chamber correspondingly. The hot air jacket is arranged outside the boiler furnace. A spiral air duct is arranged in the hot air jacket. A heated cylinder, a smoke inlet box, a smoke return box and a smoke outlet box are arranged in the upper boiler body. The end, far away from the combustor, of the spiral air duct in the hot air jacket communicates with the inner portion of the heated cylinder. The smoke inlet box and the smoke outlet box are arranged at the end, far away from the combustor, of the heated cylinder. The smoke return box is arranged at the other end of the heated cylinder. Multiple rows of smoke pipes are arranged in the heated cylinder. The two ends of a lower pipe bundle of the heated cylinder communicate with the smoke inlet box and the smoke return box correspondingly. The two ends of an upper pipe bundle of the heated cylinder communicate with the smoke outlet box and the smoke return box correspondingly. The back combustion chamber communicates with the smoke inlet box. A chimney is arranged on the upper side of the smoke outlet box. The upper side of the end, far away from the combustor, of the heated cylinder is provided with a hot air outlet. The thermal efficiency of the environment-friendly air heating boiler burning the oil and the natural gas is greatly improved.

Description

technical field [0001] The invention relates to the field of boilers, in particular to a fuel-fired natural gas hot-air environment-friendly boiler which uses oil or natural gas as fuel and only uses air as a heating medium, and a combustion chamber and a heat exchanger are integrated. Background technique [0002] The fuel-fired natural gas hot air boilers in the prior art are usually separated from the combustion furnace and the drum of the heat exchange and heating tube bundle, and the flue gas in the furnace is directly discharged by the chimney. The distance of the flue gas is short, the exhaust gas temperature is high, and the boiler thermal efficiency is high. Low, the thermal efficiency of the fuel-fired natural gas hot air boiler with two separate bodies can generally only reach about 70%. Due to the high flame temperature when fuel oil or natural gas is fired, if the boiler body and the heat exchange heating tube bundle are combined, the high temperature flame in t...

AI Technical Summary

Problems solved by technology

Due to the high flame temperature when fuel oil or natural gas is fired, if the boiler body and the heat exchange heating tube bundle are combined, the high temperature flame in the boiler furnace can easily burn through the heating tube bundle, which cannot guarantee the safe and stable operation of the boiler

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