To develop a protection body including a wood main burning material, fossil additional burning material, a peripheral body and a control body to make up for defects in direct combustion as an example of application of almost inexhaustible biomass (botanical resources), with up-to-date technology, as the foundation of gradual improvement for present and near future domestic and international problems.

The protection device includes the protection body including the wood main burning material, the fossil additional burning material including a fossil fuel supporting material for burning a fossil fuel of high calorie disposed to be intensively burned and replenished in a final process near a turbine of a heating pipe to supply the steam in the heating pipe of high temperature and high pressure necessary and sufficient to rotate a turbine, and the control body including a computer, Internet and the like constituted to totally smoothly and comprehensively perform the control according to the output necessary for the rotation of the turbine by controlling a wood fuel supply machine for nearly automatically supplying a wood fuel of the wood main burning material, a fossil fuel supply machine for nearly automatically supplying the fossil fuel of the fossil additional burning material, and the peripheral bodies.