part 1: overview of cogeneration and its status in asia - Fire

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Summary of country study – Bangladesh 145 What if the electricity price escalates faster? Internal Rate of Return 50% 45% 40% 35% 30% REPM GTPM GTTM 6% 7% 8% 9% 10% 11% 12% 13% Electricity Price Escalation Rate From the sensitivity analysis of the potential cogeneration alternatives for the recycled paper mill, the reciprocating engine power match option meeting power requirement of 2750 kW is found to be the most suitable cogeneration system. It represents an initial investment of 118 Million Taka and leads to an internal rate of return of 41.9 per cent. 3.3.2 Vegetable oil refinery This factory operates 24 hours a day and 340 days a year. Natural gas is used in boiler to generate steam that is required for the process. Energy alone accounts for 35 per cent of the production cost. Analysis of the monthly electricity and steam consumption in 1997 led to the following: • Total Electricity Consumption in 1997: 4,229 MWh • Maximum Electricity Demand: 650 kW • Minimum Electricity Demand: 510 kW • Total Steam Consumption in 1997: 12,260 tons • Maximum Steam Demand 1.68 ton/hr Minimum Steam Demand: 1.43 ton/hr The average power-to-heat ratio was 0.53 in 1997. Typical cogeneration system for this site would be based on steam turbine, though its size will be quite small. However, reciprocating engine, gas turbine cogeneration systems were also considered as potential alternatives. Results of the feasibility study are summarized in Table 3.6. Obviously, the steam turbine option does not seem feasible: (i) with steam turbine thermal match (STTM), less than 20 per cent of the power requirement is met; (ii) with steam turbine power match (STPM), 300 per cent excess heat is generated. With the reciprocating engine thermal match (RETM) option, 235 per cent excess power is generated. The project profitability will depend on the buy-back rate. This may not be a good option as the purpose is not to earn from electricity sale. Reciprocating engine power match (REPM) option seems feasible as almost all the power needed can be met though an auxiliary boiler will be necessary to make up for the 30 per cent shortfall in the heat supply.
Summary of country study – Bangladesh 146 Table 3.6 Summary of pre-feasibility study of the vegetable oil refinery Major Parameters Steam Turbine Gas Engine Gas Turbine Thermal Match Power Match Thermal Match Power Match Thermal Match Power Match Installed power (kW) 101.00 520.00 1,804.00 520.00 772.00 520.00 Fuel consumption (TJ/year) 36.80 190.50 164.00 47.30 85.20 57.40 Electricity generated (MWh) 771.00 3,984.00 13,819.00 3,984.00 5,914.00 3,984.00 Heat generated (TJ/year) 30.20 156.30 30.20 8.70 30.20 20.40 Excess/deficit(-) power (MWh/year) -3,458.00 -245.00 9,950.00 -245.00 1,685.00 -245.00 Excess/deficit(-) heat (TJ/year) 1.60 112.00 1.60 -19.90 1.60 -8.30 Equipment power-to-heat ratio 0.092 0.09 1.87 1.87 0.80 0.80 Total investment (million Taka) 5.79 29.95 77.93 22.46 37.06 24.96 Net present value (million Taka) 6.61 6.23 102.69 39.82 49.27 37.61 IRR (per cent) 31.90 18.30 34.30 40.30 34.40 36.80 With gas turbine thermal match (GTTM) option, about 35 per cent excess electricity is generated which may be acceptable. Gas turbine power match (GTPM) option is also good as the 30 per cent deficit in the heat supplied can be met by auxiliary natural gas firing in the recovery boiler. Accordingly, the sensitivity analysis carried out to see the impacts of the increase in the investment, fuel and electricity price escalation, was limited to REPM, GTTM and GTPM options. What if the investment cost increases? 45% 40% 35% 30% 25% What if the fuel price escalates faster? Internal Rate of Return REPM GTPM GTTM 20% 1% 2.50% 5% 7.50% 10% 12.50% 15% Internal Rate of Return (IRR) 45% 40% 35% 30% % of Increase Invesrment Cost REPM GTPM GTTM 25% 5% 6% 7% 8% 9% 10% 11% 12% 13% Escalation Rate of Fuel Price
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PART 1: OVERVIEW OF COGENERATION AN
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4 Part I: Overview of cogeneration
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State of art review of cogeneration
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Policy framework for promoting coge
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Cogeneration in Asia today 49 1.1 I
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Cogeneration in Asia today 51 4,000
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Cogeneration in Asia today 53 1.3 T
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Cogeneration in Asia today 55 1.3.3
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Cogeneration in Asia today 61 1.7 R
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Cogeneration in Asia today 63 Every
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Cogeneration in Asia today 65 Cogen
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68 Part II: Cogeneration experience
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Cogeneration experiences around the
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part 1: overview of cogeneration and its status in asia - Fire

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