Malte Förster

OXYCOAL-AC: Towards an integrated coal-fired power plant process with ion transport membrane-based oxygen supply

The cooperative project OXYCOAL-AC aims at the development of a zero-CO2-emission coal combustion process for power generation. The scope of the research comprises a multitude of aspects. This article focuses on membrane-based air separation modules and their design for oxycoal conditions, the specifics of coal combustion in a CO2/O2 atmosphere including related burner design as well as the cleaning of hot flue gas from oxycoal combustion.

Pressurised pulverised coal combustion - a coal- based combined-cycle state of the cooperative project: cleaned flue gas matches specifications for use with gas turbines

A high efficiency of 60% in a combined-cycle power plant technology with fuels like gas or light oil is estimated to be achievable. On the other hand existing conventional coal-fired power plants based on steam generation have an efficiency of about 40–45%. A huge potential of improvement in efficiency could be achieved by the implementation of a simple and cost-effective technology: PPCC, a coal-based combined-cycle with combustion of coal at high pressure (up to 20 bar) and temperature (1500°C) with a subsequent efficient ash and alkali removal from the flue gas under pressure at process temperature to use it directly as input for a gas turbine. This process can be considered as the most suitable and straightforward design to utilise hard coal in a combined cycle with an efficiency of ~55% and above. The concept results in a straightforward and robust design at low installation and operating costs. We report the success in removing liquid ash particles to a content of <1 mg/m³ s.t.p., particle diameters d <<1 µm and the progress in alkali-reduction to a content <0.01 mg/m³ s.t.p. thus meeting gas turbine specifications. Perspectives and possible spin-offs of the technology are deduced.