Power plants – Motive fluid energized by externally applied heat – Power system involving change of state
Patent
1976-08-23
1978-05-23
Ostrager, Allen M.
Power plants
Motive fluid energized by externally applied heat
Power system involving change of state
60653, 60670, F01K 1300, F01K 1502, F01K 1706
Patent
active
040903621
ABSTRACT:
A thermodynamic power cycle and engine for motive power is disclosed which uses a condensible working fluid such as water in which the pressurized fluid, after being heated to vapor, is expanded to perform work in two or more stages with low expansion ratios per stage. The working fluid is reheated between one or more of the expansion stages with short reheats having high average heat addition temperatures. For use with a positive-displacement expander, the fluid has suspended in it a finely-divided powdered lubricant, such as calcium difluoride, which is used to lubricate all wear surfaces. After the fluid leaves the expander, it is still superheated and is desuperheated prior to condensing by transferring its energy to the combustion chamber inlet air. This air preheating reduces the fuel quantity required and facilitates the use of difficult-to-burn fuels such as coal dust. The combustion of the fuel and air preferably proceeds to two steps: the first overly rich and the second very lean.
REFERENCES:
patent: 3282048 (1966-11-01), Murphy
patent: 3797248 (1974-03-01), Witzel
patent: 3835650 (1974-09-01), Chesmejef
patent: 3848412 (1974-11-01), Michels
patent: 3893299 (1975-07-01), Hutchinson
patent: 3914091 (1975-10-01), Yamagishi
patent: 3940939 (1976-03-01), Davis
patent: 4023367 (1977-05-01), Izumi
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