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

Summary of country study – Bangladesh 151
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
processing mill, the reciprocating engine power match option meeting power requirement of
875 kW is found to be the most suitable cogeneration system. It represents an initial
investment of 37 Million Taka and leads to an internal rate of return of 40.8 per cent.
3.3.5 Hospital
This hospital operates throughout the year without any stop. Electricity is required for
lighting, air conditioning and motors whereas as a lot of thermal energy is needed in the form
of steam for various applications.
Analysis of the monthly electricity and steam consumption data of 1997 led to the following:
• Total Electricity Consumption in 1997: 7,108 MWh
• Maximum Electricity Demand: 1,200 kW
• Minimum Electricity Demand: 800 kW
• Total Thermal Energy Consumption in 1997: 91.5 TJ
• Maximum Steam Demand: 4.99 ton/hr
Minimum Steam Demand: 3.90 ton/hr
The power-to-heat ratio of the site was calculated to be 0.68 for 1997. Typical cogeneration
system suitable for this site would be based on gas turbine. However, reciprocating engine
and steam turbine cogeneration systems were also considered as potential alternatives.
Results of the feasibility study are summarized in Table 3.9.
The steam turbine option is found to be not suitable: (i) with steam turbine thermal match
(STTM), less than 30 per cent of the power requirement is generated and the hospital will
have to depend heavily on the utility grid; (ii) with steam turbine power match (STPM), 119
per cent excess heat are generated which has no commercial value.
With the reciprocating engine thermal match (RETM) option, 475 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 there will
be small (16 per cent) shortage in the heat supply. There is no need for an auxiliary boiler as
this shortfall can be easily made up by auxiliary natural gas firing in the recovery boiler.