The paper presents the results of an industrial scale combustion test investigating the effects of firing petroleum coke in a CFB-boiler originally designed for bituminous coal. In stage 1 of the testing the petcoke portion was gradually increased up to 100%. As the testing focused on the effects to a CFB-boiler originally designed for a different fuel all relevant information as furnace temperature, material circulation, heat transfer and flue gas emissions were recorded, evaluated and compared to mere coal operation. The paper presents the test results featuring the aspects of boiler operation, boiler efficiency and desulfurization. In stage 2 of the testing the applicability of molded petcoke was investigated. This molded petcoke was prepared by granulating original petcoke and compressing a mixture of petcoke, flyash and limestone. Laboratory tests had indicated an advantegeous behaviour, but due to insufficient mixture in the make-up process the testing of this fuel had to be stopped in an untimely fashion. As the testing of the original petcoke showed quite promising results in operational aspects and efficiency as well, continous co-firing of petcoke at that plant where the testing was executed has been started in February 2002 with a petcoke heat input portion up to 70%.

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