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On December 21, following several days of continuous monitoring, the three medium-pressure steam boilers in the power station of the natural gas purification plant at the Puguang branch of the Zhongyuan Oilfield achieved an energy efficiency level of over 92.4% after undergoing low-nitrogen combustion modifications. The emissions of nitrogen oxides were kept below 30 milligrams per standard cubic meter, which is lower than Sichuan Province’s local standard of 50 milligrams per standard cubic meter; this achievement provides strong impetus for the green transformation of the oilfield. The power station is the \"heart\" of the natural gas purification plant; the three medium-pressure steam boilers, A, B, and C, are responsible for providing a steady supply of steam to the downstream purification units. However, nitrogen oxides are generated during boiler combustion; before the renovation, the boiler’s nitrogen oxide emissions amounted to 150–200 milligrams per standard cubic meter. To reduce nitrogen oxide emissions and support the green transformation of gas fields, Puguang Branch established a specialized technical team to address this issue. After multiple rounds of process evaluation, the combined approach of \"low-nitrogen burners + flue gas recirculation\" was ultimately chosen – this method utilizes flue gas recirculation to significantly reduce the generation of nitrogen oxides. During the renovation period, the company adopted a work management approach based on staggered timing, different peak periods, and separate locations. It carefully planned the operations, and implemented measures such as physical barriers, dedicated personnel for inspections, and risk-based control strategies. As a result, the number of high-risk tasks was reduced by 70%, and the boiler upgrade was completed 25 days ahead of schedule, achieving improvements in both efficiency and safety. This renovation has achieved breakthroughs in both energy conservation and environmental protection, making the \"power heart\" of the gas field stronger and more reliable. It not only provides solid support for ensuring energy supply during winter but also lays a solid environmental foundation for the green and low-carbon development of oil and gas fields.