关键词: 垃圾焚烧, 大容量, 脱硫脱硝一体化, 工艺研究

Abstract: The integrated treatment technology of desulfurization and denitrification in the furnace of waste incineration power plant is to inject denitrification and desulfurization agents into the furnace of waste incinerator at the same time to remove NOx and SO2 from the source of pollutant generation. In this study, the collaborative control of multi-pollutants in large-capacity incinerator flue gas was taken as the research object, and the emission characteristics of NOx and SO2 were analyzed under the conditions of no desulfurization and denitrification process, using high-temperature denitrification agent and high-temperature desulfurization agent alone, adopting the process of “high-temperature desulfurization+semi-dry deacidification” and using desulfurization and denitrification agents collaboratively. And the economic costs of traditional process and the integrated process of desulfurization and denitrification were compared. The results showed that when 0.5 g/m3 denitrification agent and 0.9 g/m3 desulfurization agent were injected into 750 t/d furnace at the same time, the denitrification efficiency and desulfurization efficiency could reach above 74% and 84% respectively, and the daily average of NOx emission index could be lower than 100 mg/m3, and the daily average of SO2 emission index could be lower than 50 mg/m3. When the process of “high-temperature desulfurization+semi-dry deacidification” was adopted and the lime slurry flow rate was fixed at 2 000 L/h, the SO2 emission concentration at the chimney outlet could be stably controlled below 20 mg/m3. The technical and economic analysis showed that compared with the traditional boiler tail flue gas treatment processes, the integrated process of desulfurization and denitrification in the furnace was simple and low cost, which could not only reduce the consumption of chemicals, but also reduce investment costs by 90% and operating costs by 59%. It had a good application prospect in the source control of NOx and SO2 emissions.

Key words: waste incineration, large-capacity, integrated desulfurization and denitrification, process research