Crispin Thanks for your knowledgeable comments.
Last week I witnessed such a burner assembly reach bright orange heat, (fuelled by 100kg/hr wood gasifier!) and wondered whether the annular air ducting would be more effective than free air for cooling. Subsequently the flue has been lined with 1" of refractory - a partial solution - but I like the idea of using an annular heat shield that provides accelerated cooling and air pre-heat. Ken Doing sustainable energy work in Northern California.
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