Sustainability 2022 , 14 , 4669
11of 18
3.3. Sensitivity Analysis To optimize the process, the effect of gasification temperature and ER on composition, LHV , and density of syngas, CGE , CCE , and . P net obtained from thermal treatment of the M2 pellet is analysed by setting a fed flow rate of 1.0 kg/h. 3.3.1. Effect of Temperature Gasification temperature is varied in the range of 700 to 1000 ◦ C at a fixed ER of 0.3 to estimate its optimum value. The fluctuation of syngas composition with gasification temperature is presented in Figure 4. The variation of LHV and density of syngas, CGE , CCE and . P net is presented in Figure 5.
60
40
20
0
700
800
900
1000
Temperature (°C)
ƀ
CO
ƀ
Ƃ
ƀ Ƃ
Figure4. Effect of gasification temperature on syngas composition.
5.5
5
75
0.4
5
4.8
65
0.3
4.5
4.6
55
4
4.4
45
0.2
700
800
900
1000
700
800
900
1000
Temperature (°C) LHV Net Power
Temperature (°C) CGE CCE Syngas density
( a )
( b )
Figure 5. Effect of gasification temperature on CGE , CCE , and syngas density ( a ) and syngas LHV and net power from gasification products ( b ). The concentration of CO and H 2 increases continuously with temperature, whereas thatofCO 2 ,CH 4 , andC 2 H 4 shows an opposite trend due to the alteration of exothermic and endothermic reaction rates with temperature [49,51,63]. Endothermic reactions (water–gas and water–gas shift reactions in this case) move in the forward direction with temperature,
Made with FlippingBook - Online magazine maker