LU Lin, LI Wenqi, FENG Qing, TANG Yongzhi, LAN Yi
(Jingdezhen Ceramic University, Jingdezhen 333403, Jiangxi, China)

Abstract: In ceramic production process, the firing process consumes the largest proportion of energy and emits pollutants. Natural gas is currently the main choice in the firing process. Although methane, the main gas component, is a clean energy, as compared with traditional carbon and oil, pollutants (such as NO₂) could be produced. In response to carbon peaking and carbon neutrality goals, we focused on the effect of hydrogen doping on combustion during kiln firing. Using five hydrogen doping ratios, the effect of hydrogen on overall combustion of the kiln was clarified. It is concluded that the addition of hydrogen would promote combustion, increase the temperature in the kiln by 200 K, and increase the production rate of free radicals (such as ·O, ·OH, and ·H), with increasing content of hydrogen. The addition of hydrogen would promote the production of NO in the kiln, but the production of NO₂ could be inhibited. The addition of hydrogen does not change the properties of the combustion, which is still a combustion reaction dominated by C-H chain oxidation. The optimal hydrogen doping ratio in the kiln was 40%.
Key words: methane; hydrogen; clean combustion; ceramic kiln