“KOSOVO” Dispersion Calculations
4.2
Date: 07.05.2007
Page 7
Diffuse Sources (Ash Tips)
Diffuse dust emissions in principle arise during the following processes involved in the transport and storage of ash: •
Transfer of the ash from one belt section to another
•
Dropping of the ash from the belt onto the tip
•
Wind erosion of the tip.
These diffuse dust emissions are quantified below. The calculations are based on VDI Guideline 3790, Sheet 3 – “Emissions of gases, odours and dusts from diffuse sources: Storage, handling and transport of bulk material“. In addition data from the US EPA are also used.
Emissions resulting from the bulk material handling and dropping from the belt The emission factors for the taking up and delivery of bulk material are calculated in accordance with VDI 3790 Sheet 3 as follows: Emission factor for the delivery:
qDel = qnorm,corr * ρ * kU
with the normed and corrected emission factors qnorm and qnorm,corr, the bulk density ρ and the environmental factor kU . qnorm,corr = qnorm *kH * 0.5 * KEquipment where kH = 17.8 for free-fall dropping from a height of 20 m and KEquipment =1 for the dropping from the belt and qnorm for continuous dropping in accordance with formula 7a of VDI 3790 Sheet 3 for highly dust-producing material and a belt capacity of 60 t/h = (10+5)-2 * 83.3 * 60-0.5 = 3398. In order to determine the normed and corrected emission factors for the taking up and delivery of bulk materials during the transfer process these must first be classified in accordance with their dust emission potential. This classification is performed in accordance with Appendix B of VDI 3790 Sheet 3 taking into consideration the grain size distribution of the combustion bed ash with an average moisture content.
GfA Consult GmbH
Report No.: 40207-01.B01