Pressurized pulverized coal combustion combined cycle with high temperature heat exchanger
Among power plants based on coal combustion, a Pressurized Pulverized Coal Combustion Combined Cycle (PPCCCC) can achieve highest electrical efficiencies. This cycle is not yet state of the art as a reliable and sufficient system for gas cleaning from dust and alkaline compounds upstream of the gas turbine, which operates at inlet temperatures about 2,400 F, is still to be developed. Experience in fly ash precipitation can be derived from Circulating Fluidized Bed Combustion which--due to the sticky property of coal ash at higher temperatures--is restricted to temperatures below 1,700 F. At the Institute fur Warme- und Brennstofftechnik (IWBT) of the Technical University of Braunschweig a cycle has been developed that integrates a fly ash removal at these temperature into a combined cycle by means of a high temperature heat exchanger. The flue gas leaving the combustion chamber is cooled down in the heat exchanger before it is cleaned by means of ceramic filter candles. After that, the clean flue gas is heated up again in counterflow to the raw gas to drive the gas turbine. In this cycle, the heat exchanger provides acceptable temperatures for the gas cleaning. In a research project performed at the IWBT, a heat exchanger from ceramic material and the fly ash removal are tested in an atmospheric test facility. One goal of the test facility is to find out the maximum allowable operating temperature of the heat exchanger, concerning possible slagging and high temperature corrosion effects, according to the properties of the coal ash. Furthermore, the operation of the gas cleaning system in combination with the ceramic heat exchanger is investigated.
- Research Organization:
- Technical Univ. of Braunschweig (DE)
- OSTI ID:
- 20034344
- Resource Relation:
- Conference: 25th International Technical Conference on Coal Utilization and Fuel Systems, Clearwater, FL (US), 03/06/2000--03/09/2000; Other Information: PBD: 2000; Related Information: In: 25th international technical conference on coal utilization and fuel systems: Proceedings, by Sakkestad, B.A. [ed.], 969 pages.
- Country of Publication:
- United States
- Language:
- English
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