Modeling Performance of High-Temperature Biomass Gasification Process

Table 7

The effects of preheated air temperature on (a) chemical, (b) chemical, and physical exergy efficiencies.

(a)  

Biomass material	ER	Chemical exergy efficiency (𝜂ex,ch)
		and irreversibility (I) values
		for the biomass materials
		𝜂ex,ch (%)		𝐼 (%)
		800°K	1400°K	800°K	1400°K
	0.3	73.8	83.5	26.2	16.5
Rice husks	0.35	79.6	89.0	20.4	11.0
	0.4	85.4	93.2	14.6	6.8
	0.3	79.2	79.8	20.8	20.2
Sugarcane baggase	0.35	82.3	81.9	17.1	17.7
	0.4	84.3	84.6	15.7	15.3
	0.3	81.9	82.4	19.1	18.6
Palm stem	0.35	84.2	84.6	15.8	15.4
	0.4	86.3	86.6	13.7	13.4

(b)  

Biomass material	ER	Chemical and physical exergy efficiency
		(𝜂)ex,ch+phy and irreversibility (I) values for
		the biomass materials
		𝜂ex,ch+ph (%)			𝐼 (%)
		800°K	900°K	1400°K	900°K
Rice husks	0.3	62.9	64.8	46.3	25.2
	0.35	68.6	70.9	51.5	29.1
	0.4	74.4	76.9	55.6	23.1
Sugarcane baggase	0.3	71.7	72.1	54.2	27.9
	0.35	74.4	74.7	56.7	25.3
	0.4	76.7	77.0	58.9	23.0
Palm stem	0.3	75.3	75.7	59.9	24.3
	0.35	77.7	77.9	62.1	22.1
	0.4	79.7	79.9	64.0	21.1