Don't worry, you are not alone in not understanding Mr. Guddu.
To come back to your initial question, a waste heat power generation plant must really be tailored to the specific characteristics of a given plant. It may not be a good idea to extrapolate 'as is' from another plant.
You better ask some prefeasibility study and estimation from known suppliers in this field.
In our company, we worked quite a lot with SINOMA TCDRI: http://www.tcdri.com.cn/English/6.asp
I am not in charge of any of these projects however, so don't ask me for details ;-)
Best regards,