Abstract: Waste-to-energy(WTE) has become the mainstream way of waste treatment method in China. Improve the energy efficiency of waste incineration power plants is currently the focus of the operation of the waste incineration industry in the context of “dual carbon”goals. The different waste heat utilization technology routes and their advantages and disadvantages were discussed. And a certain waste incineration power plant in Northeast China was taken as the research object to analyse the waste heat utilization effect. Results indicated that the adoption of waste heat heating technology enabled the overall plant efficiency to exceed 50% during the winter heating period, with a maximum efficiency of up to 71.33%. The utilization of waste heat for heating in waste incineration power plants could improve the social environmental benefits, economic benefits and carbon emission reduction benefits of the incineration plant. During a single heating season, 25 000 tons of standard coal could be saved, and the carbon emission reduction was approximately 66 000 tons. The research aims to provide references and inspirations for promoting the technical optimization of waste incineration equipment and systems, and enhancing the development level of the industry.

Key words: waste incineration plant, thermal efficiency； energy efficiency of the whole plant, waste heat utilization of lack steam, high back pressure extraction turbine