Paper details

Title:

Integration of a Drying Process in a Large-Scale Pulverized Coal-Fired Power Plant for the Co-Firing of Local Available Biomasses at High Rates

Author(s):

Everts, B., Distler, T., Kather, A.

Document(s):

Abstract:

When increasing the co­firing rate of local available biomasses like wood chips or green cuttings with coal in large­scale pulverized coal­fired power plants to rates above 5 – 10 % of the rated thermal input, fuel and flue gas mass and volume flows increase in ways that exceed the existing power plant capacities. The biomass fuels high moisture contents causing these restrictions can be reduced in a drying process. The purpose of this work is the evaluation of the required drying performance depending on biomass type and co­firing rate as well as showing possibilities and restrictions of process integrated biomass drying. Therefore a steam heated contact dryer is modelled in EBSILON®Professional and integrated in the model of an existing full scale coal­fired power plant. Providing the required drying heat via integration of the drying process into the power plant process can be beneficial but has not been content of other scientific approaches so far. The possibilities for steam extraction and re­integration of the condensate to the water­steam cycle are evaluated in this work. The results show benefits to the fuel characteristics through loss in moisture content and thereby reduced mass and volume flows as well as a reduced energy demand for fuel grinding. Moreover impairments of power output are caused by the required drying heat duty.

Keywords:

biomass, coal, drying, efficiency, cofiring, integration

Topic:

Biomass Conversion Technologies for Heating, Cooling and Electricity

Subtopic:

Solid biofuels combustion in large utilities

Event:

22nd European Biomass Conference and Exhibition

Session:

2BV.2.48

Pages:

731 - 736

ISBN:

978-88-89407-52-3

Paper DOI:

10.5071/22ndEUBCE2014-2BV.2.48

Price:

FREE