blob: 3f1142bae2d3720639178f6362e4f3be27f129cc (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
///Chapter No 11 Steam Boilers
////Example 11.9 Page No 237
///Find Mass of steam consumption
///Input data
clc;
clear;
P=15; //Boiler produces steam in bar
Tsup=250; //Boiler temperature in degree celsius
Tw=35; //Feed water in degree celsius
MWh=1.5; //steam supplied to the turbine
CV=32000; //Coal of calorific value in KJ/Kg
etaboiler=80/100; //Thermal efficiency in %
fr=210; //Firing rate in Kg/m^2/h
//From steam table(temp basis at 35 degree celsius)
hfw=146.56; //In KJ/Kg
Ts=198.29; //In degree celsius
hfg=1945.2; //In KJ/Kg
hg=2789.9; //In KJ/Kg
Cps=2.3;
//calculator
hs=hg+Cps*(Tsup-Ts); //Enthalpy of superheated steam(with superheater) in KJ/Kg
ms=9000/MWh; //Steam rate in Kg/MWh
mf=((ms*(hs-hfw))/(etaboiler*CV)); //Mass of steam consumption in Kg/h
GA=mf/fr; //Grate rate in m^2
//Output
printf('Enthalpy of superheated steam(with superheater)=%f KJ/Kg \n',hs);
printf('Steam rate= %f Kg/h \n',ms);
printf('Mass of steam consumption=%f Kg/h \n',mf);
printf('Grate rate=%f m^2 \n',GA);
|
