Abstract: Hydrogen, as a carbon-free fuel, is characteristic of highly productive, non-polluting and zero carbon emissions. Hydrogen combustion in industrial gas boilers can reduce the use of carbon-containing fuels, but it will have an impact on NO_x emissions. In this paper, a techno-economic analysis of green hydrogen was carried out. As well as coal/hydrogen co-firing experiments were conducted on a 50 kW downstream furnace. which can achieve self-sustained combustion of pulverized coal. The generation of NO_x, CO and CO₂, and the impacts of hydrogen co-firing ratio were investigated on the basis of air staged combustion. The findings demonstrate that at present, it is economically feasible to produce hydrogen from waste electricity that cannot be stored, such as wind and solar energy. As the hydrogen co-firing ratio rises, the emission of CO₂ gradually decreases, the emission of NO_x increases and subsequently decreases. The lowest NO_x emission at 30% hydrogen ratio is 263.3 mg/m³, or oxygen volume fraction is 3.5%. The rise in hydrogen doping ratio causes a first increase in CO emissions followed by a reduction. When burnout air rate is increased in a specific hydrogen co-firing ratio, the emission of NO_x significantly decreases. Compared to 17% burnout air, there is a significant reduction in NO_x emissions at 52% burnout air. With 17% burnout air, the emission of NO_x is decreased from 742.7 mg/m³ to 193.6 mg/m³. This research advances the development of hydrogen fuel in the field of coal-fired power generation, supports the use of hydrogen doping technology in large-scale industrial boilers with data, and helps coal-fired boilers achieve their “dual-carbon” goal. Overall, coal co-firing with hydrogen technology possesses both carbon reduction potential and combustion regulation complexity. In the future, if it can be operated synergistically with tail-end flue gas purification and carbon capture systems, it will play a more positive role in the low-carbon transformation of the thermal power industry.