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 NOx emissions. In this paper, a techno-economic analysis of green hydrogen was carried out. And coal/hydrogen co-firing experiments were conducted on a 50kW downstream furnace of Dongfang Boiler Co., Ltd. which can achieve self-sustained combustion of pulverised coal. The generation of NOx, 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. The NOx emission increases and subsequently decreases as the hydrogen cofiring ratio rises. The lowest NOx emission at 30% hydrogen doping ratio is 263.3 mg/m3, or 3.5% of oxygen. The rise in hydrogen doping ratio causes a first increase in CO emissions followed by a reduction. When burnout air rate is increased to a specific hydrogen co-firing ratio, NOx emissions are significantly decreased. Compared to 17% burnout air, there is a significant reduction in NOx emissions at 52% burnout air. With 17% burnout air, the NOx emission 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.