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Economic evaluation of A-USC power plant with CO2 capture unit

Stępczyńska-Drygas K., Dykas S., Łukowicz H., Czaja D.

Journal of Power Technologies

2015

Vol. 95, spec.

75--83

Achieving CO2 emission control while keeping electricity prices competitive is one of the most important economic and technical challenges. The strategy for lowering the CO2 emission from the coal-based power plants includes first of all raising electricity generation efficiency. Currently, steam temperatures in ultra-supercritical (USC) power plants are limited to approximately 627ºC by the use of the most advanced commercially available ferritic steels. To go to higher temperatures, high-nickel alloys must be used. The nickel alloys are at an advanced stage of development and are expected to be available to support construction of a demonstration plant in Europe in 2021. For pulverized coal (PC) plants the development means progressing to advanced ultra-supercritical (A-USC) steam conditions - 35MPa/700/720ºC. It turned out that the concept consists in gradually raising the live steam temperature and pressure can become economically unjustified. Cost-effectiveness of new investments can be provided only by a significant increase in the efficiency of electricity generation. In the paper the economic evaluation of 900 MW PC unit is presented. The main aim is to compare the cost of electricity generation in USC (28MPa/600/620ºC) and A-USC (35MPa/700/720ºC) power unit. The variants with CO2 capture installation by chemical absorption MEA are considered. Compared to a USC design, the capital cost of the A-USC PC plant will be higher, but the operating cost will be lower. Because of the higher efficiency of the A-USC plant, the differential in operating cost increases as fuel price increases and CO2 cost charges are included.

Operation of conceptual A-USC power unit integrated with CO2 capture installation at part load

Stępczyńska-Drygas K., Bochon K., Dykas S., Łukowicz H., Wróblewski W.

Journal of Power Technologies

2013

Vol. 93, nr 5

383--393

Nowadays, the main aim of the development of coal-fired power industry concentrates on improving the efficiency of electricity generation and on reducing the CO2 emission. Modern power systems require from the power units ability to flexible work at part loads with high efficiency. The paper presents the conceptual 900 MWcoal-fired power unit. Unit operates with advanced ultra-supercritical (A-USC) steam parameters 35MPa/700ºC and net efficiency of 49%. Improvement of the efficiency results in significant reduction of CO2 emission. Further reduction of emission requires integration of coal-fired power plants with CO2 capture installation. Newly built power plant offers a possibility of fully optimized integration to reduce the efficiency loss, which is related with post-combustion capture process. The CO2 capture by wet chemical absorption MEA can be characterized with three indicators: the demand for heat, electric power to drive auxiliary equipment and cooling. In order to calculate these indicators the capture process was modeled in Aspen Plus. Calculated indicators for nominal and part load operation were used to model integrated power unit in Ebsilon Professional 10.0. The characteristics of operation of power unit integrated with CO2 capture installation were determined.