Download Steam Power Plants PDF

TitleSteam Power Plants
File Size1.2 MB
Total Pages73
Table of Contents
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Document Text Contents
Page 36

Pulverized coal

• Coal is pulverized (powdered) to increase its surface area (and
therefore exposure) thus permitting rapid combustion.

• The pulverized coal is obtained by grinding the raw coal in
pulverizing mills. Various types of pulverizing mills are:

• Ball mill

• Ball and race mill

• Hammer mill

• Bowl mill

• Essential functions of pulverizing mills are:

• Drying of the coal

• Grinding

• Separation of particles of a desired size.

Coal pulverizing mills reduce coal to powder by any (or all) action such as
Impact, Abrasion and Crushing

Page 72

Schmidt-Hartmann Boiler
• There are two pressure circuits in this
boiler

• Primary circuit

• Secondary circuit

• Primary circuit uses distilled water that
goes from the drum to primary

evaporator kept at the furnace. Steam
generated is passed through a

submerged heating coil kept inside the
drum. It loses heat to water in secondary
circuit and condenses. A condensate
pump maintains primary water

circulation.

• In the secondary circuit, normal water is
pumped to evaporator drum which picks
up heat from steam in submerged coils.

• Steam thus produced is superheated
and passed on to the turbines.

FIRE GRATE

SUPER HEATER

SUPER HEATED
STEAM

WATER LINE

C
O

N
D

E
N

S
A

T
E

C
O

O
L
E

R

DRUM

H
E

A
T

IN
G

S
U

R
F

A
C

E

PUMP

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