Mercury emissions from polish pulverized coalfired boiler

Abstract

Abstract. The current paper presents the research results carried out at one of Polish power plants at a pulverized hard coal-fired 225 MW unit. The research was carried out at full load of the boiler (100% MCR) and focused on analysis of mercury content in the input fuel and limestone sorbent for wet flue gas desulfurization (FGD) system, as well as investigation of mercury content in the combustion products, i.e. fly ash, slag, FGD product (gypsum) and FGD effluents (waste). Within the framework of the present study the concentration of mercury vapor in the exhaust gas was also investigated. The analysis was performed using Lumex RA-915+ spectrometer with an attachment (RP-91C). The measurements were carried out at three locations, i.e. before the electrostatic precipitator (ESP), downstream the ESP, and downstream the wet FGD plant. Design of the measurement system allowed to determine both forms of mercury in the flue gas (Hg 0 and Hg 2+ ) at all measurement locations.Based on the measurement results the balance of mercury for a pulverized coal (PC) boiler was calculated and the amount of mercury was assessed both in the input solids (fuel and sorbent), as well as the gaseous and solids products (flue gas, slag, ash, gypsum and FGD waste).

Pozyskiwanie węgla kamiennego z uwzględnieniem wybranych regulacji środowiskowych – studium przypadku polskiego sektora energetycznego

“…For each of the substances (SO 2 , dust, nO x , HCl, Hg, HF), the degree of emission reduction (installation efficiency) has been assumed following the values published in the environmental declarations of the EMAS system (EcoManagement and Audit Scheme), the Catalogue of Power Plants and Combined Heat and Power Plants, and on the websites of energy companies (ARE 2022). If this information was not made available, the average indicator for the national power industry or literature data would be adopted (Radović 1997;lorenz 1999;Bustard et al 2003;Qi et al 2003;Pavlish et al 2008;Chmielniak and Pilarz 2014;Deng et al 2014;Burmistrz et al 2016;Wichliński et al 2017;Fu et al 2018;Kim et al 2019;Zhou et al 2022;GDEP 2022;RAFAKO 2022).…”