Environmental aspects of heat recovery systems of boiler plantsNataliia Fialko, Raisa Navrodska, Malgorzata Ulewicz, Georgii Gnedash, Sergii Alioshko and Svitlana ShevcukE3S Web Conf., 100 (2019) 00015DOI: https://doi.org/10.1051/e3sconf/201910000015