Three Steps Mixed (Fire Tube–Water Tube) Vertical Boiler to Optimize Thermal Performance

The research aims to design and construct a new mixed vertical boiler (fire tube – water tube) with three gas passes. strength of this technological innovation is in the best use thermic transmission receiving fluid (hot water, steam, thermal oil), due its multipurpose function steps using alternative fuels (Diesel, Liquid Petroleum Gas LPG, natural gas), by improving efficiency temperature reduced gases at low temperatures, which turn also reduce environmental pollution. methodology focuses on calculating transfer area calculation method that will allow dimensioning boiler, considering losses speed, two defined procedures, first for fire boilers. And another alternative. results obtained allowed optimizing level, achieving very significant results: With LPG 92.4% hot 92.42% generate steam same way 90.25% 90.24% as well Diesel 2; 89.21% 89.31% steam.