Formation and emission of fine particles from two Danish pulverised coal fired power plants
ABSTRACT
Measuring campaigns at two Danish pulverised coal fired power plants has been performed. The power plants are equipped with the same type og flue gas cleaning devices. The concentrations and chemical compositions of the formed particles were similar for the two plants. The measurements were performed simultaneously at three locations including both total dust measurements and fine particle characterisation with low pressure impactors and scanning mobility particle sizers. The size distribution of the particles formed during the combustion is clearly bimodal and the fine particles (< 1m) account for less than 1 % w/w of the total dust concentration. The fine particles are formed by condensation of vaporised species and show significant enrichment of several trace elements. Less than 0.5 % w/w of the total particle mass penetrate the electrostatic precipitators. The fine particles have penetrations of 4-6 % w/w clearly indicating the difficulties accompanied with the removal of fine particles from the flue gas, in good agreement with the theory for electrostatic precipitator performance. The flue gas desulfurisation plants have very little effect on the fine particles which easily penetrate the plants. Almost all particles emitted from the stacks are smaller than 10 m and the fine particles account for 19-38 % w/w of the total emitted mass..
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