Coal, Gas

High-efficiency alternative available

Issue 9 and Volume 101.

LETTERS

High-efficiencyalternative available

In reference to your article on the Kalina combined-cycle plant (“First Kalina combined-cycle plant tested successfully,” May 1997), little known, and unheralded, another turbine cycle efficiency improvement [the Rosenblatt Cycle Turbine System, (RCTS)], was being developed and patented concurrently with the Kalina cycle. It was invented by an experienced American engineer working alone on an island in the Florida Keys–with no governmental assistance.

He used a few old text and reference books and a hand-held calculator–and invented a new turbine cycle system that: equals or exceeds the maximum theoretical potential of the Kalina Cycle; involves no new technology beyond what has been commonly taught in basic thermodynamics courses; employs a “low-tech” application of existing technology requiring no R&D to verify; and involves no hardware components with less than 50 years` accumulated operating experience in identical hardware configurations, and readily available from existing plant capacities that have been in the business of supplying them for years.

Extensive computer simulation studies, for a series of different RCTS applications, indicate:

¥ Nuclear plants: 15 percent net power increase delivered at the bus-bar from the same steam source in the turbine plant.

¥ Dual flash geothermal plants: 25 percent net power increase from the same geothermal brine delivered to the surface plant; single flash geothermal plants: 45 percent increase from the hot water left after the single flash in an existing plant.

¥ Combined-cycle gas turbinesystems: at least an additional 5 percent added to the combined-cycle output.

These detailed computer simulation reports and reprints of the original published paper are available from the writer to people in the power generation industry.

Joel Rosenblatt, P.gif.

Summerland Key, Fla.

e-mail: [email protected]

Avoiding safetyvalve problems

Your article (“Proper installation can avoid safety valve problems,” April 1997) was good and of extreme interest to me since my entire career was involved with safety valves (SV). I started working for Crosby Valves in 1957 and spent eight years setting them in all phases of industry. I did, however, specialize in utility boilers and nuclear installations.

Burgeson should expand on sizing of discharge piping, especially on high-pressure boilers. Reaction forces on main steam SVs in PWRs also created a major problem for the industry, which required larger stacks.

Robert A. Garritano

Overland Park, Kan.

All things are goodin moderation …including radiation

In the April 1997 issue of Power Engineering, you wrote a short article on the topic of low-level radiation that “40 of 50 years ago people paid to … benefit from the healthful effects of low-level radiation.” I can assure you that even today people pay for the benefits from these effects. To witness this, just go to Abano and Montegrotto Terme in northern Italy, which specialize in low-level radiation and hot-mud treatments of diseases which respond to such cures (particularly arthritis and certain types of inflammatory diseases). Several hundred thousand patients are treated annually this way, and the medical results are encouraging.

The combined effects of the microbiological agents in the applied mud, the thermal effects and the low-level radiation appear to stimulate tissue regeneration and the body`s immune system. However, it should be emphasized that the radiation levels are weak, corresponding in magnitude to exposures encountered on airplane flights; the source is radon gas which disperses rapidly in the open space once released from the mineral water; and the exposure is usually limited to two to three week periods. The experiences at Abano and Montegrotto Terme (and other similar resorts) appear to confirm the effects you mention in your article.

Axel Hirhager

European Investment Bank