| 摘要 |
PURPOSE:To improve combustion efficiency and eliminate the danger of a fire by placing numberless small pores on the wall surface of a stack. CONSTITUTION:The wall of a stack has such a structure that small pores 2 formed on the wall surface of the stack 1 make crooked passages 3 in zigzag condition between the outside and inside of the stack. The open air is sucked from the small pores on the wall surface because of the ascending action of heat and the heat in the stack is reduced rapidly. At that time, since the ascending action is further increased in the stack, action aiding the combustion in a boiler chamber is found. Since the open air is sucked from the small pores on the surface of the stack, action cooling constantly the wall of the stack is shown.
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