27-12-2012, 06:28 PM
TRAINING REPORT ON PATRATU THERMAL POWER PLANT JHARKHAND
TRAINING REPORT.pptx (Size: 6.08 MB / Downloads: 363)
1. Coal is conveyed (14) from an external stack and ground to a very fine powder by large metal spheres in the pulverized fuel mill (16).
2. There it is mixed with preheated air (24) driven by the forced draught fan (20).
3. The hot air-fuel mixture is forced at high pressure into the boiler where it rapidly ignites.
4. Water of a high purity flows vertically up the tube-lined walls of the boiler, where it turns into steam, and is passed to the boiler drum, where steam is separated from any remaining water.
5. The steam passes through a manifold in the roof of the drum into the pendant superheater (19) where its temperature and pressure increase rapidly to around 200 bar and 570°C, sufficient to make the tube walls glow a dull red.
6. The steam is piped to the high-pressure turbine (11), the first of a three-stage turbine process.
7. A steam governor valve (10) allows for both manual control of the turbine and automatic set point following
8. The steam is exhausted from the high-pressure turbine, and reduced in both pressure and temperature, is returned to the boiler reheater (21).
9. The reheated steam is then passed to the intermediate pressure turbine (9), and from there passed directly to the low pressure turbine set (6).