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2.8 TypesofHRSG HRSGs can be classified according to their design, operation and also application. - Fired and Unfired The steam generated in a HRSG may also be used for process heating apart from it’s main function of driving a steam turbine. The load condition of the primary waste heat source, i.e. an internal combustion engine or a gas turbine, could affect the process heating at times of low load running by not meeting the desired steam demand. Therefore some HRSGs are fitted with separate fuel burners at the inlet duct of the HRSG, usually fired with the same fuel as the mail engine, to be used at reduced waste heat supply conditions and are classified as supplementary-fired HRSGs. - Single and Multiple Pressure Operation Smaller HRSG units are typically designed only with a single pressure level of steam generation in order to decrease complexity and ensure lowest possible costs. Larger units and especially combined cycles aiming at high efficiency would enhance the heat recovery in the HRSG by using multiple (usually 2 or 3) pressure levels of steam generation. - Horizontal and vertical Based on the position of the waste heat gas flow, the HRSG can be designed horizontally or vertically. Although both the designs carry similar manufacturing costs the different geometry has the following advantages over one-another, as listed in Table 2.4. Table 2.4 Comparison of Horizontal and Vertical HRSGs Horizontal Require 30% larger footprint area Higher number of expansion joints Less structural requirements Difficult to maintain and inspect Vertical Requires less ground space Lesser number of expansion joints Higher and complex structural requirements Easier to maintain and inspect 17PDF Image | waste heat recovery steam power system for ACE Embilipitiya
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