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USE OF A NEW TYPE OF ANTHRACITE BURNER AND BOILER IN A POWER STATION

Ziel

To demonstrate the use of an innovative, low pollutant burner of low volability anthracite, in a power station, in combination with a boiler system linked to a coal mine, thus solving the problems of mineral oil substitutes, use of low volability coal, SO2 separation, nitrogen removal, adjustability and economy.
The burners were able to ignite and burn low volatile coal in the combustion chambers of this unit, however, an operation of the boiler was not possible. Reasons were the temperature level, flow behaviour, heat expansion and instabilities of the feed water flow. Thus the project failed.
The calculation of expected and actual simple payback was originally based on a comparison with oil burning installations. Based on today's oil price a re-evaluation does not turn out favourable for coal.
Furthermore, a realistic comparison cannot be conducted due to the defective boiler.
The burner design, divided into pre-burner and main burner, means that the ignition and burning of the coal dust can be maintained without brick-lined burner walls and heated combustion air. Due to the type of air passage and course of combustion, the combusted ash is drawn off dry; the boiler can be dimensioned without the need to take waste gas loading into account. The direction of the air and combustion allows "the cold" combustion with low NOx concentrations. By the addition of lime dust, waste gases are desulphurised in the burner.
After grinding to dust, fine coal is passed from storage silos to 7 burners then passed for pre-burning where it is ignited using propane gas; this is gradually decreased (after warming the pre -burner) as the coal dust passes in.
This, then, continues to burn by recirculation of hot exhaust gases and continuous glowing coal-dust residue at the end of the pre -burner/start of the main burner. Air supply is via nozzles at the end of the burner which allows combustion control, termination and separation of air particles for easy disposal.
To reduce SO2, lime dust is added in the main burner. Waste gas is filtered prior to emission to the atmosphere.
The advantage of low-volability coals are :
- easier storage (fewer volatile components);
- easier transport by road, without need for special measures;
- no danger from explosion since anthracite dust is not self -igniting, and there is no risk to groundwater.
It is comparable to gas or oil-fired systems from the viewpoint of handling, storage and burning.

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GEWERKTSCHAFT SOPHIA-JACOBA
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Deutschland

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