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Cyclone combustor design for the burning of variable calorific value fuels

Syred, Caroline, Griffiths, Anthony John and Syred, Nicholas 2003. Cyclone combustor design for the burning of variable calorific value fuels. Presented at: 14th International Symposium on Transport Phenomena, Bali, Indonesia, 6-10 July 2003.

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One of the major problems arising from the use of gasified products from biomass in small gas turbines is the development of stable secondary combustors which can efficiently utilise the variable quality medium to low calorific value gases so produced whilst still be capable of efficiently utilising fuels such as heating oil or natural gas for start-up/shutdown operations or as a pilot fuel during certain operational periods. A further requirement in direct-fired gas turbine applications is the removal of as many particles as possible down to 5 microns or less to minimise damage to the turbine. A cyclone type combustor was designed for such a process and will run on multiple fuels, primarily oil and low to medium CV wood gas. The combustor was designed with three tangential inlets, an oil inlet, a wood gas inlet and an air inlet. CFD modelling of the combustor was performed using the package Fluent. The model was initially run on LCV gas. The flow characteristics and temperature patterns in the combustor were investigated and the behaviour of the fuels combustion patterns studied. The LCV gas entering the combustor contained particles of varying size. The combustor was designed with a conical bottom section to collect the large particles, however finer particles are still carried with the flow to the combustor exit. The exhaust gas from the combustor must contain particles with a diameter below 5 microns, otherwise damage to the turbine would occur. The combustor was designed with a vortex collector pocket (VCP) positioned just before the tangential off take to collect the finer particles before they exit the combustor. Results showed the combustor produced a stable swirling flame, with good mixing patterns for the LCV gas. Areas of high temperature in the combustor were identified, where refractory material would be needed. The VCP performance was good, collecting most particles below 5 microns.

Item Type: Conference or Workshop Item (Paper)
Date Type: Completion
Status: Unpublished
Schools: Engineering
Subjects: T Technology > TD Environmental technology. Sanitary engineering
Uncontrolled Keywords: Cyclone combustor ; LCV gas
Last Modified: 02 Jan 2018 21:09

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