Reducing nitrogen oxide emissions in boilers at moistening of blowing air in heat recovery systemsRaisa Navrodska, Nataliia Fialko, Georgii Presich, Georgii Gnedash, Sergii Alioshko and Svitlana ShevcukE3S Web Conf., 100 (2019) 00055DOI: https://doi.org/10.1051/e3sconf/201910000055