You want the water hotter? Just turn up the gas. (BTW in modern plants this is done by computers)
Want the water hotter in a coal fired plant? Have the RxR coal cars dump more coal, then feed the coal
onto a belt which feeds the burners, produce lots of nasty by-products such as acid rain, fly ash, mercury,
greenhouse gases, and it beats the hell out of the equipment and structures too.
In college we went to a metal alloy plant on the Ohio River that used coal and "the dirt" inside the plant
was amazing.
" Unfortunately, the legacy of coal extraction, including acid mine runoff and scared landscapes will probably
be around for centuries." Yes, I know it well but under Obama he (and his team) started just cleaning up the
"gob piles" from left over coal operations and some of the streams and rivers that used to run blue (free
acid) or orange from the acid mine drainage started to clean up .... no more studying the problem which
had been studied many times over .... just clean it up and use the money from the pennies on a ton of coal
extracted fee and fix the problem. Waterways that had been dirty for generations started to get better.
Trump killed those projects.
BTW 
on Metallurgical Coal .... to make certain metals we still need coke coal
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