|
Cost Comparison for Co-firing 15% Wood Chips vs. Charcoal with Coal
in a 100 MW
Pulverized Coal Boiler
|
|
Wood Chips
|
Charcoal
|
Biomass MW |
15 |
15 |
Capacity
Factor, % |
85% |
85% |
Annual Energy
From Biomass, GWh/yr |
112 |
112 |
Net Heat Rate,
kJ/kWh |
11,066 |
10,929 |
Biomass
HHV,
kJ/kg (dry) |
19,104 |
30,175 |
Feed Rate, 1000
tonnes per year (dry) |
64.7 |
40.5 |
O&M Cost
Comparison, $/yr. |
base |
471,677 |
Annual Cost of
Capital |
base |
(945,064) |
Annual Cost
Comparison, $/yr |
base |
$ (473,387) |
Incremental Costs for Wood & Charcoal (note 1) |
O&M Cost
for Wood, cents/kWh |
0.79 |
|
O&M Cost
for Wood , $/yr |
877,883 |
|
Charcoal Cost,
$/tonne |
|
75 |
Coal Cost,
$/tonne (wet) |
|
39 |
Price
Difference, $/tonne (wet) |
|
36 |
Biomass
Moisture Content, % |
21.5% |
7.2% |
Price
Difference, $/tonne (dry) |
|
33 |
Cost Increase
for Charcoal, $/year |
|
1,349,560 |
O&M Cost
Comparison, $ per year |
base |
471,677 |
Capital Cost Analysis (note 2) |
Capital Cost
for Biomass Equipment, $/kW Capacity |
255.50 |
|
Capital Cost
for Biomass Equipment, $ |
3,832,500 |
250,000 |
Capital
Recovery Factor, 5 years at 10% |
0.26 |
0.26 |
$ per year |
1,011,014 |
65,950 |
Capital Cost
Avoidance for Charcoal, $ per year |
base |
(945,064) |
Notes: |
(1)
Wood Cost From "Biomass Co-Firing" Year 2000 Excluding Credit for Consumables |
(2) P&I on
5 year loan at 10% interest rate |
|
|
Biomass Charcoal vs. Wood Chips for Co-firing with Coal
Data used in Chart:
Charcoal
|
|
|
|
|
|
Charcoal MW |
|
5 |
10 |
15 |
20 |
Capacity Factor, % |
|
85% |
85% |
85% |
85% |
Annual Energy From Charcoal,
GWh/yr. |
|
37 |
74 |
112 |
149 |
Net Heat Rate, kJ/kWh |
|
10,929 |
10,929 |
10,929 |
10,929 |
Charcoal HHV, kJ/kg (dry) |
|
30,175 |
30,175 |
30,175 |
30,175 |
Charcoal dry mt per year |
|
13,500 |
27,000 |
40,500 |
54,000 |
Charcoal, dry mt per day |
|
37 |
74 |
111 |
148 |
Moisture Content, % H20 |
|
7.2% |
7.2% |
7.2% |
7.2% |
Charcoal Feed Rate, mt per day |
|
40 |
80 |
120 |
159 |
Wood Chips
|
|
|
|
|
|
Wood Chips MW |
|
5 |
10 |
15 |
20 |
Capacity Factor, % |
|
85% |
85% |
85% |
85% |
Annual Energy From Wood Chips,
GWh/yr. |
|
37 |
74 |
112 |
149 |
Net Heat Rate, kJ/kWh |
|
11,066 |
11,066 |
11,066 |
11,066 |
Wood Chips HHV, kJ/kg (dry) |
|
19,104 |
19,104 |
19,104 |
19,104 |
Wood Chips Feed Rate,
dry mt per year |
|
21,600 |
43,200 |
64,700 |
86,300 |
Wood Chips dry mt per day |
|
59 |
118 |
177 |
236 |
Moisture Content, % H20 |
|
21.5% |
21.5% |
21.5% |
21.5% |
Wood Chips Feed Rate, mt per day |
|
75 |
151 |
226 |
301 |
 |
