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

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Summary of country study – Bangladesh 149 What if the electricity price escalates faster? Internal Rate of Return (IRR) 49% 47% 45% 43% 41% 39% 37% 35% REPM GTPM 6% 7% 8% 9% 10% 11% 12% 13% % of Increase Fuel Price Escalation Rate From the sensitivity analysis of the potential cogeneration alternatives for the textile spinning mill, the reciprocating engine power match option meeting power requirement of 2,350 kW is found to be the most suitable cogeneration system. It represents an initial investment of 102 Million Taka and leads to an internal rate of return of 41.9 per cent. 3.3.4 Textile processing mill This factory operates 24 hours a day, for 340 days a year. Natural gas is used in boiler to generate steam that is required for the process. The production process is sensitive to any fluctuations in the power supply or power failures. Analysis of the monthly electricity and steam consumption data of 1997 led to the following: • Total Electricity Consumption in 1997: 7,433 MWh • Maximum Electricity Demand: 1,100 kW • Minimum Electricity Demand: 875 kW • Total Thermal Energy Consumption in 1997: 89.3 TJ • Maximum Steam Demand: 5.66 ton/hr Minimum Steam Demand: 3.40 ton/hr The power-to-heat ratio of the site was estimated as 0.3 for 1997. Typical cogeneration system for this site would be based on steam turbine. However, reciprocating engine and gas turbine cogeneration systems were also considered as potential alternatives. Results of the feasibility study are summarized in Table 3.8. The steam turbine option is found to be not suitable: (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), 90 per cent excess power and 170 per cent excess heat are generated. With the reciprocating engine thermal match (RETM) option, 325 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 the heat generated meets up to 80 per cent of the demand. An auxiliary boiler will be necessary to make up for the remaining 20 per cent shortfall in the heat supply.
Summary of country study – Bangladesh 150 Table 3.8 Summary of pre-feasibility study of the textile spinning mill Major Parameters Steam Turbine Gas Engine Gas Turbine Ther mal Match Powe r Match Therma l Match Powe r Match Therm al Match Powe r Match Installed power (kW) 238.00 875.00 4,157.00 875.00 1,843.00 875.00 Fuel consumption (TJ/year) 88.90 326.10 382.50 80.50 205.70 97.70 Electricity generated (MWh) 1,849.00 6,783.00 32,226.00 6,783.00 14,284.00 6,783.00 Heat generated (TJ/year) 73.00 267.80 73.00 15.40 73.00 34.70 Excess/deficit(-) power (MWh/year) -5,584.00 -650.00 24,793.00 -650.00 6,851.00 -650.00 Excess/deficit(-) heat (TJ/year) -16.30 151.80 -16.30 -73.90 -16.30 -54.60 Equipment power-to-heat ratio 0.091 0.09 1.87 1.87 0.80 0.80 Total investment (million Taka) 13.74 50.40 179.59 37.80 88.44 42.00 Net present value (million Taka) 16.94 20.37 234.12 68.43 110.84 64.59 IRR (per cent) 33.20 21.30 34.10 40.80 33.40 37.20 With gas turbine thermal match (GTTM) option, about 90 per cent excess electricity is generated. Gas turbine power match (GTPM) option takes care of all the power needs though heat deficit is as high as 60 per cent. This will require the adoption of auxiliary natural gas firing in the recovery boiler. The total installation cost of GTPM is 50 per cent less than that for GTTM. 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 and GTPM options. What if the investment cost increases? Internal Rate of Return (IRR) 42% 40% 38% 36% 34% 32% 30% What if the fuel price escalates faster? Internal Rate of Return 41% 40% 39% 38% 37% 36% 35% REPM GTPM 1% 3% 5% 8% 10% 13% 15% % of Increase Investment Cost REPM GTPM 5% 6% 7% 8% 9% 10% 11% 12% 13% Fuel Price Escalation Rate
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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 3: SUMMARY OF COUNTRY STUDIES
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Page 177: Summary of country study - Viet Nam
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