Steam Engine Design/Boiler

=Boiler= A simple boiler implementation involves a Babington_Burner heating the inside of a 6 inch metal pipe of 1/8" wall thickness. A 100 foot long coil of 1/2 inch steel tubing is placed inside this coil, and an electronically-controlled Valve delivery system (note: in steam engine case, the 'solar boiler' in last link is replaced by the above 100-foot coil of steel tubing.

=Design Rationale=


 * Easy to fabricate
 * Welds around each tube - 48 welds
 * Tubes stick through end plate for welding
 * End plates covers are welded on afterwards
 * 40 square foot area, sufficient for 8 hp steam engine?



=Review= By VK Desai of Tinytechindia.com:

Not perfect idea. Flue gas path not shown. Boiler cover not shown. 40 sq feet enough for 4 hp steam engine.

Materials

 * Stainless steel tubing at McMaster Carr, $130 for 100 feet of 1/2" tubing - type 304 stainless - item number 8989K67 at http://mcmaster.com
 * 200 psi pressure relief valve http://www.grainger.com/Grainger/wwg/guideBrowse.shtml $60.80.

Boiler Fuel: For transportation vehicles some biomass fuel energy densification is required. Pyrolisis fuels without elaborate processing look promising here is a brief summary of some methods http://www.ars.usda.gov/sp2UserFiles/Program/307/biomasstoDiesel/RobertBrown&JenniferHolmgrenpresentationslides.pdf http://www.biomasscombustion.com/horizontal_grate_technology.htm

Stationary applications can probably get by with a simple style grate biomass boiler. http://www.biomasscombustion.com/horizontal_grate_technology.htm

=Flash Steam Generator=


 * Coil bending jig - $400
 * Stainless steel coil, 150 feet - $200
 * Babington fittings and metal - $100
 * Dremel tool - $40
 * Dremel micro drill press - $40