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Re: Tire burning Page 1 of 2 [Date Prey [Date Next][Thread Prey][Thread Next][Date Index][Thread Index] Re: Tire burning • To: "pacific justice center" <pic@igc_apc.org> • Subject: Re: Tire burning • From: Ferdinand.Engelbeen@ping.be (Ferdinand Engelbeen) • Date: Wed, 29 May 1996 23:08:58 +0200 (MET DST) • Cc: dioxin-1@essential.org On Thu, 23 May 1996, pacific justice center asked for more information on wood and tire chips burning. We have some imformation on industrial wood burning, but we first want to emphasise that we are not speaking for the industry, we are working in the chemical industry, together with hundreds of other Chlorophiles. For that reason, we do have some knowledge on chlorine and related topics of consideration. By TNO, The Netherlands, two types of wood incinerators were tested on dioxin formation: two installations where the wood is fed underneath, primary air is blown THROUGH the mass and secundary air is fed on a higher level to have an as complete as possible incineration of CO and volatile organics. The other installation had a two step concept, first the wood is degassed and carbonised. The off-gases are post-burned with secundary air. In the second step the carbonised wood is burned, the heat is used to degass the wood of the first step. In all three testruns contaminated wood was used, the 'contamination' being plastics and isolation material (polyurethane) and glue from furniturerests. The only off-gas cleaning were cyclones to retain particles. The results: The two underneath fed incinerators emitted 0.4-0.9 ng I-TEQ/m3 dioxins, the two-step incinerator emitted 1 ng I-TEQ/m3. In all cases the yearly emissions were low: 0.001-0.004 g I-TEQ/year for 3480, 2350 and 291 kW nominal heat generation. This gives 3-7 microgram dioxin per ton of incinerated wood. The USEPA estimates for industrial wood burning are 0.3-3 microgram I-TEQ/ton (average for all types) . Tyre chips burning has two disadvantages, compared with wood burning: It gives a very dense smoke, which may be less pronounced if the secondary air is working well enough. If not, an after-burner should be installed to solve this problem. The second problem is that tires have a rather high sulphur content, wich gives sulfur dioxyde, which should be neutralised. The metal content of tires can play a role in dioxin building, but that depends mainly of the incinerator concept and practical process circumstances. If they can keep the temperature above 800 °C for a few seconds, most dioxins will be destroyed. The only problem could be the slow cooling of particle laden off-gases before the cyclone. But why should you burn it? In Belgium, old rubber is mixed in asphalt to give 'silent' asphalt, used e.g. in Formula I race circuits. I am not sure, but I think it is Exxon Belgium which sells this. http://www.essential.org/listproc/dioxin-1/msg00390.html 8/13/98