Power Plant Engineering

58 POWER PLANT ENGINEERING

Mixing

tank

Collecting

chamber

Biogas

Biomass +

water

Slurry

Out flow

tank

Digester

Fig 2.3. Fixed Dome type.

Biomass +

water Biogas Slurry

Outflow

tank

Digester
Fig 2.4. Floating gas holder type.
Floating Gas Holder Type. In this design a dome made floats above the slurry in the disaster.
In the Fig. 2.4, The disaster tank is of cylindrical masonry construction. The floating dome is of fabri-
cated steel construction. The dome guide shaft provides the axial guide to the floating dome. As the gas
is collected in it. The sliding bearing provides smooth sliding surface and guide to the floating dome.
The gas generated in the slurry gets collected in the dome and the dome arises. The water seal tank
provides separation between the gas in the dome and the outlet gas.

2.15 Wind Energy

Wind energy is another potential source of energy. Winds are the motion of air caused by un-
even heating of the earth’s surface by the sun and rotation of the earth. It generates due to various
global phenomena such as ‘air-temperature difference’ associated with different rates of solar heating.
Since the earth’s surface is made up of land, desert, water, and forest areas, the surface absorbs the
sun’s radiation differently. Locally, the strong winds are created by sharp temperature difference be-
tween the land and the sea. Wind resources in India are tremendous. They are mainly located near the
sea coasts. Its potential in India is estimated to be of 25 × 10^3 mW. According to a news release from
American Wind Energy Association the installed wind capacity in India in the year 2000 was 1167 mW
and the wind energy production was 2.33 × 10^6 mWh. This is 0.6% of the total electricity production.