关键词: CFB锅炉, 清洁化, 天然气, 改造, 节能, 降碳

Abstract:

It introduces the situation of two 310 t/h CFB natural gas retrofit project in a refining and chemical enterprise. Transformation content: Based on the design status of the original CFB boiler and the combustion characteristics of natural gas, recalculate and arrange each heating surface, adjust the heat exchange area and proportion. The results show that compared to the same period in 2018, in 2021, fuel consumption of coal and coke decreased by 329 kt, natural gas consumption increased by 170 kt, and comprehensive plant electricity consumption decreased by 60 GW·h, equivalent to an annual emission reduction of approximately 480 kt of carbon dioxide. The annual reduction of auxiliary material consumption was 127 kt, with an indirect reduction of approximately 55 kt of carbon dioxide, and a total reduction of approximately 530 kt of carbon dioxide. The CFB boiler natural gas retrofit project was completed on schedule, achieving the expected goals of coal reduction, carbon reduction, and clean green production for the enterprise. After the revamping, the boiler still faces problems such as sudden increase in furnace vibration amplitude and high fluctuation of furnace negative pressure, which restrict the boiler's load-bearing capacity and require relevant technical research to solve.

Key words: CFB boiler, clean, natural gas, revamping, energy saving, carbon reduction