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HRSG, the steam itself is originally raised within the gasifier). The cooled gases are then exhausted via the stack to atmosphere. The condensate from the low pressure LP steam turbine is passed through a condensate preheater prior to entry to the deaerator. Here the incoming water is heated by direct contact with steam. From the deaerator, there are three supply lines to the HRSG, namely the HP, IP and LP lines. The LP pump supplies feedwater directly to an LP evaporator within the HRSG. Following evaporation, some saturated steam is extracted after the LP evaporator and used in the dryer to remove moisture from the incoming pulverised fuel (PF). The remaining saturated steam from the evaporator feeds into the LP superheater. After being superheated, the LP steam is split into two lines. One line supplies the superheated LP steam to the LP turbine another recirculates the LP superheated steam back to the deareator. The IP pump supplies feed water to the syngas cooler and gasifier membrane wall where the heat from the gasification process is utilised to generate IP steam as previously described. Some steam is also bled off and fed to the gasifier itself as part of the gasification process. The IP steam from the gasifier is then fed into the HRSG for superheating. Following superheating, the IP steam is added to the exit line from the HP turbine. These lines combine and are reheated in the HRSG before entering the IP turbine. The HP pump supplies feedwater to the high-pressure, low-temperature (HP/LT) economiser and then on to the HP/HT economiser. Upon leaving the HP/HT economiser, feedwater is extracted to supply the waste heat boiler within the gasifier (see above) as well as supplying a source of heat for the clean fuel gas line. Saturated steam is therefore produced from both the HP evaporator within the HRSG and the waste heat boiler within the gasifier. The two steam lines then recombine to be superheated within the HRSG. The superheated HP steam is then fed to the HP turbine for power generation. The IP turbine steam supply consists of the HP turbine exit flow combined with the HRSG IP line. The LP turbine steam supply consists of the IP turbine exit flow combined with the HRSG LP line. (91)
Figure 33: Diagram of a typical IGCC plant with dry feed gasifier (Courtesy of Mitsui Babcock Energy Ltd) (92)
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