Positive pressure waste heat boiler

The utility model provides a positive pressure waste heat boiler which comprises a boiler body and a protective shell, the boiler body is provided with an air inlet pipeline and an exhaust pipeline, and the protective shell is of a sealed structure and wraps the boiler body. The gas inlet pipeline and the exhaust pipeline penetrate through the protective shell and are sealed with the protective shell, gas is filled between the protective shell and the boiler body, and the pressure intensity of the gas is larger than the external air pressure. The differential pressure between the inner side and the outer side of the boiler body is reduced, and therefore the risk of leakage is reduced. In addition, the differential pressure between the inner side and the outer side of the boiler body can be reduced, so that the operation pressure in the boiler body can be improved, and the heat efficiency is improved. 本申请提供一种正压余热锅炉，包括锅炉本体和保护壳，所述锅炉本体设有进气管道和排气管道，所述保护壳为密封结构，所述保护壳包覆于所述锅炉本体上，所述进气管道和所述排气管道穿过所述保护壳设置且与所述保护壳之间实现密封，所述保护