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

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Summary of country study – Bangladesh 147 What if the electricity price escalates faster? Internal Rate of Return (IRR) 50% 45% 40% 35% 30% 6% 7% 8% 9% 10% 11% 12% 13% Escalation Rate of Electricity Price From the sensitivity analysis of the potential cogeneration alternatives for the vegetable oil refinery, the reciprocating engine power match option meeting power requirement of 520 kW is found to be the most suitable cogeneration system. It represents an initial investment of 22 Million Taka and leads to an internal rate of return of 40.3 per cent. 3.3.3 Textile spinning mill This factory operates 24 hours a day and 350 days a year. Natural gas is used in boiler to generate steam that is required for the process. The production is greatly affected by any fluctuations or micro-cuts in the power supply. Analysis of the monthly electricity and steam consumption data of 1997 led to the following: • Total Electricity Consumption in 1997: 20,096 MWh • Maximum Electricity Demand: 2,500 kW • Minimum Electricity Demand: 2,350 kW • Total Thermal Energy Consumption in 1997: 66 TJ • Maximum Steam Demand: 3.520 ton/hr • Minimum Steam Demand: 3.225 ton/hr The power-to-heat ratio of the site was estimated as 1.1 for 1997. Typical cogeneration system for this site would be based on reciprocating engine. However, steam turbine and gas turbine cogeneration systems were also considered as potential alternatives. Results of the feasibility study are summarized in Table 3.7. As expected, the steam turbine option is not suitable: (i) with steam turbine thermal match (STTM), less than 10 per cent of the power requirement is met; (ii) with steam turbine power match (STPM), 770 per cent excess heat is generated. With the reciprocating engine thermal match (RETM) option, 62 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 requirement can be met though the heat generated is largely inadequate to meet the demand. An auxiliary boiler will be necessary to make up for over 65 per cent shortfall in the heat supply. REPM GTPM GTTM
Summary of country study – Bangladesh 148 Table 3.7 Summary of pre-feasibility study of the textile spinning mill Major Parameters Steam Turbine Gas Engine Gas Turbine Therm al Match Power Match Therm al Match Power Match Therm al Match Power Match Installed power (kW) 263.00 2,350.00 4,080.00 2,350.00 1,746.00 2,350.00 Fuel consumption (TJ/year) 88.80 794.90 386.40 222.60 200.60 270.00 Electricity generated (MWh) 2,096.00 18,753.00 32,555.00 18,753.00 13,983.00 18,753.00 Heat generated (TJ/year) -17,974.00 -1,316.00 12,486.00 -1,316.00 -6,136.00 -1,316.00 Excess/deficit(-) power (MWh/year) 71.20 637.40 71.20 41.00 71.20 95.90 Excess/deficit(-) heat (TJ/year) 5.20 507.60 5.00 -25.00 5.20 29.90 Equipment power-to-heat ratio 0.106 0.106 1.87 1.87 0.80 0.80 Total investment (million Taka) 15.12 135.36 176.24 101.52 83.81 112.80 Net present value (million Taka) 18.20 41.41 287.14 192.42 134.34 175.52 IRR (per cent) 32.80 19.90 38.40 41.90 38.10 37.40 With gas turbine thermal match (GTTM) option, about 30 per cent less electricity are generated. Gas turbine power match (GTPM) option takes care of all the power and heat needs but around 46 per cent of excess heat are generated which has no commercial value. 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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Page 90: PART 3: SUMMARY OF COUNTRY STUDIES
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