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Extra resources for General Training Air conditioning - Module 9 Troubleshooting
Sample text
7), and at Eemscentrale, at Eemshafen, The Netherlands, with five units and Gent Ringvaart, with a single unit in Belgium which went into service in 1997. Eight single-shaft units were installed at Black Point, Hong Kong. The majority of single-shaft systems have been supplied in the 50 Hz market, by the European manufacturers. Each single-shaft block can be supplied as a standalone 400 MW power station or in a group of two or three separate units with shared facilities such as water treatment and control room.
All the above values are as measured at the gas turbine exhaust flange. In some parts of the USA, however, emissions have been defined as measured at the outlet of the stack. In the New England states the requirement is for 3 ppm coming from the stack and, to meet this, a catalyst must be installed in the heat recovery boiler to promote a chemical reaction with ammonia to reduce NOx to nitrogen and water. The reaction works best above 300 °C and the catalyst is therefore placed in the boiler upstream of the low-pressure superheater.
It was only when American developers came into the market and brought the horizontal-boiler technology with them that these boilers started to appear in Europe in any great number. The aero-derivative gas turbines which had come into utility service for peaking and standby duty in the 1960s were now much larger and with dry low-emissions combustion systems in the generator and mechanical drive versions could be operated anywhere. The GE LM6000, which was introduced in 1990, was a turbofan core engine rated at 42 MW and running at 3600 rev/min and could therefore drive a 60 Hz generator without the need for a gearbox.