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Fossil fuel

Coal burning 
For process steam 
Chain grate boiler Capacity from 5t/h to 30t/h, and pressure from 1.25Mpa to 2.5Mpa (12.5bar to 25bar) are standard. 
Thermal efficiency of 79% to 82% is expected. 
Advantages: short lead time, easy operation, robust construction, easy to maintain, low in price, less demand in civil work. 
Dis-advantages: low thermal efficiency, coal quality required (less than 3% sulfur, minimum LHV for coal  @4500Kcal/kg), So2 emission require external equipment. Maximum pressure is 2.5Mpa 
(25bar), super-heated steam temperature 450C (maximum) Applications: process steam or hot water. 

For Co-gen Power plant 
Circulated fluidized Bed (CFB) boiler
Commonly used Capacity from 25t/h to 480t/h, pressure from 3.8Mpa to 9.8Mpa (38bar to 98bar), steam temperature up to 540C, Thermal efficiency up to 92% is expected. According to the capacity, the technology could produce boiler with capacity over 1000t/h and pressure above 20Mpa (ultra critical). 
For smaller power plant there are boilers with CFB technology that capacity could be as small as 10t/h, if the application requires (calls) for it. 
Advantages : high thermal efficiency, flexible coal quality (as low as 3200Kcal/kg) LHV, combustion Desox , low Nox burning, stable operation. 
Dis-advantages: yearly maintenances require, higher operating cost and equipment cost.

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