Power Plant Engineering

4.2.1. POWER STATION DESIGN
Power station design requires wide experience. A satisfactory design consists of the following
steps :
(i) Selection of site
(ii) Estimation of capacity of power station.
(iii) Selection of turbines and their auxiliaries.
(iv) Selection of boilers, and their auxiliaries.
(v) Design of fuel handling system.
(vi) Selection of condensers.
(vii) Design of cooling system.
(viii) Design of piping system to carry steam and water.
(ix) Selection of electrical generator.
(x) Design and control of instruments.
(xi) Design of layout of power station. Quality of coal used in steam power station plays an
important role in the design of power plant. The various factors to be considered while
designing the boilers and coal handling units are as follows :
(a) Slagging and erosion properties of ash.
(b) Moisture in the coal. Excessive moisture creates additional problems particularly in case
of pulverized fuel power plants.
(c) Burning characteristic of coal.
(d) Corrosive nature of ash.
4.2.2. CHARACTERISTICS OF STEAM POWER PLANT
The desirable characteristic for a steam power plant are as follows :
(i) Higher efficiency.
(ii) Lower cost.

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STEAM POWER PLANT
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(iii) Ability to burn coal especially of high ash content, and inferior coals.
(iv) Reduced environmental impact in terms of air pollution.
(v) Reduced water requirement.
(vi) Higher reliability and availability.
4.3 COAL HANDLING
Coal delivery equipment is one of the major components of plant cost. The various steps in-
volved in coal handling are as follows : (Fig. 4.2)
(i) Coal delivery
(ii) Unloading
(iii) Preparation
(iv) Transfer
(v) Outdoor storage
(vi) Covered storage
(vii) In plant handling
(viii) Weighing and measuring
(ix) Feeding the coal into furnace.
Coal Delivery
Unloading
Preparation
Transfer
Outdoor Storage
(Dead Storage)
Covered Storage
(Live Storage)
Weighing
and
Measuring
Furnace
In Plant Handling