Download Clean and efficient coal-fired power plants : development by Heinz Termuehlen PDF

By Heinz Termuehlen

The U.S. remains to be seriously reliant on coal for far of its electrical energy iteration, yet is basically utilizing superseded crops which are inefficient and soiled in comparison to the chances supplied through fresh advances

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From the final superheater, the steam enters a steam header from which the main steam piping feeds the main steam to the HP turbine. The exhaust steam of the HP turbine is fed back to the boiler reheater sections. Between the 2 reheater sections, attemperation stations control the final hot reheat steam temperature at a constant level for the admission into the IP turbine. The listed materials for the boiler sections indicate that all tubing and heavy components like headers can be manufactured from ferritic or martensitic materials, except the tubing of the final superheater and final reheater sections, which are made from austenitic stainless-steel, like TP 347 HFG (HR3C).

5 m). The low-NOX emission flue gas leaves the regenerative air heater to enter the desulfurization system before being discharged as clean flue gas through the stack or cooling tower. Since NOX emissions are not all fuel-bound but are mainly produced during the combustion process, this thermal NOX emissions can already be minimized by primary means. Primary measures improve the combustion process itself, whereas secondary measures are defined as aftercombustion cleanup systems. Figure 3-7 reveals the combustion system improvements made to minimize the formation of thermal NOX.

Since the barrel-type front section of the HP turbine outer casing carries most of the pressure difference, the inner casing can be built with only a light vertically arranged joint without mass concentration and with only light bolting. The relatively large outer casing exhaust section is radial mounted to the smaller front section. Since the exhaust section is exposed to only low steam temperatures, it can be cast from 1% chromium steel, whereas the front section of the outer casing, the inner casing, and the rotor are made from advanced 10% chromium steel as indicated in Figure 4-3.

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