1. Introduction - Firenze University Press

Gross electric power kW 244619. 244962.
CHP plant efficiency % 57.13 57.19
Results of performed analysis show that the efficiency of the CHP plant is only slightly influenced
by the way of regulation. By-pass regulation provides higher electric power by 1.4 per mill and
efficiency by 0.06 percentage point higher than that obtained when using throttling.
This kind of regulation is also used in the second variant.
4. Modernization of the power plant after its integration with a CO2
capture facility
A CHP plant will need to be modernized after being coupled with a CO2 capture unit. This problem
is covered in [3 - 6]. It concerns especially turbine, regeneration system and condensers cooling [3 -
5]. Therefore, machinery and utilities of such a plant should be chosen appropriately during the
design stage taking those changes into consideration. Considered structure (first variant) of a CHP
plant was chosen in the way that will reduce required after the integration changes as much as
possible. In fact, they are limited to the low pressure turbine, which will be mostly affected by
changed operation conditions.
5. Conclusions and remarks
Aim of this work was a design of a CHP plant structure, that will meet the requirements of the UE
Parliament and Council directive UE 2001/80/WE.
Presented structure of a “capture ready” CHP plant will work with possibly high efficiency before
and after the integration with a CO2 capture unit, providing costs of modernization to be low as
possible.
By decreasing the sorbents energy consumption by 1 MJ/CO2 one can raise the efficiency by ca. 2
percentage points.
Peak power of the heating unit is limited by the sorbents energy consumption rate.
Calculation results show that the heating unit regulation method does not affect the plants efficiency
significantly.
Performed analysis includes only the sorbents energy consumption rate and omits other auxiliary
power needs.
Acknowledgments
The results presented in this paper were obtained from research work co-financed by the National
Centre of Research and Development in the framework of Contract SP/E/1/67484/10 – „Strategic
Research Programme – Advanced Technologies for obtaining energy: Development of a technology
for highly efficient zero-emission coal-fired Power units integrated with CO 2 capture”.
References
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