Abstract:

 The CO and CO₂ concentrations and air temperature in the indoor and outdoor were observed and compared using a multi-function radio collector in 10 coal-burning residences in Jilin province during winter. The characteristics of CO and CO₂ concentrations and their relationships with the coal-burning route and indoor air temperature were analyzed. The results show that the indoor pollution comes mainly from CO of the coal combustion. The CO pollution in coal-burning residences is prevalent in Jilin province during winter and about 60% residences appear the persistent high pollution with CO concentrations exceeding 125 mg·m^-3 among samples in this survey. The monthly change of indoor CO concentration is related with coal consumption, while its diurnal variation is related with the burning method and the process of burning. The CO proportion in the flue gas differs significantly in different seasons, cities, residences, temperature and combustion process. The variation characteristics of CO concentration also differ significantly in different burning stages such as lighting the fire, normal combustion, or putting the coal over the fire and extinguishing the fire, and in the different burning status such as burning strongly, reversing the smoke flowing direction sharply or slowly.

Key words:  Coal-burning amount, CO pollution, Burning status