By V Ganapathy

Covers the layout and alertness of waste warmth boilers for business, cogeneration and municipal good waste purposes. genuine lifestyles case experiences reduction realizing the specification, operation and alertness of waste warmth boilers. additionally contains brief reduce equipment for sizing apparatus and crucial info on warmth and fabric balances. Environmental concerns together with NOx and CO emissions are provided. an essential reference for engineers, experts and executives occupied with specifying, working, engineering, advertising and comparing waste warmth boilers or warmth restoration steam turbines.

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Solution: A procedure similar to Example 2 is followed. The analysis used for air is 79% nitrogen and 21 % oxygen by volume. 1 MMBtu/h. See Figure 1-14c. Analysis of the flue gas and other data may also be obtained from the printout. Waste Heat Boiler Deskbook 30 Figure 1-14c. Input and results for Example FUEL ANALYSIS·%vol 1 methane· 2 ethane· 3 propane- ? 95 ? 2 EXHAUST GAS FLOW·L9iH,TEMP·F=? H20,N2,02=? 0,0,79,21 BURNER DUTY·BTU,H FINAL TEMP·Ftinputzero for the unknown)=? 261224E-'l8 FUEL GAS ANAL YSIS·WOL 1 methane· 95 2 ethane- 3 3 propane· 2 4 butane- 0 5 isobutane- 0 6 pentane· 0 7 isopentane· 0 8 hexane- 0 9 hydrogen· 0 10 carbon monoxide- 0 11 carbon dioxide· 0 12 nitrogen' 0 13 water vapor· 0 14 hydrogen sulfide- 0 SUPPLEMENTARY FIRING AND SYSTEM EFFICIENCY The efficiency of the HRSG system improves with firing.

The casing design described above is used for the duct work leading to the HRSG from the burner and also in the HRSG portions having a high gas temperature. Carbon steel liners and lesser insulation thiCkness may be used in low temperature portions of the HRSG and economizer. The firing transition is about 10 to 15 feet long, depending on the boiler size and the transition angle between the burner and the HRSG. The HRSG does not differ much in concept from the unfired design, except for the sizing of drum and other heat transfer surfaces and components to handle the higher steam generation.

20 % for case 2. ' As seen from the above table, the efficiency increases with additional fuel input. The additional fuel input generates nearly 90 to 95% of its energy equivalent as steam. FRESH AIR FIRING AND EFFICIENCY Fresh air firing is often used in gas turbine plants in case the gas turbine fails or is shut down and steam should still be generated. How does one select the fresh air fan capacity? The efficiency of the HRSG system increases with a decrease in stack gas temperature and mass flow, as will be shown in Chapter 4.

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