Wang Qian, Gong Dehong, Huang Zhengguang, Peng Changyang, Chen Jiandong, Luo Jie, Zhu Jiangdong, Luo Qingling
Electrical Engineering College, Guizhou University, Guiyang 550025, China.
Power China Guizhou Engineering Co., Ltd., Guiyang 550003, China.
ACS Omega. 2024 Nov 21;9(49):48586-48597. doi: 10.1021/acsomega.4c07552. eCollection 2024 Dec 10.
To address the instability of low-calorific-value waste incineration processes and suppress the generation of toxic dioxins, this study examines a 600 t/day waste incineration furnace as a case study. Numerical simulations of the incineration process were conducted by using bed calculation software FLIC and Fluent. A waste incineration cleanliness index was defined, and the impact of the reduced calorific value of the incoming waste on the temperature distribution within the incineration furnace was explored. The effectiveness of biomass steady combustion was compared to that of natural gas steady combustion, leading to the development of a control model for biomass steady combustion of low-calorific-value waste. The results indicate that a decrease in the calorific value of incoming waste reduces the cleanliness index; when the calorific value is 4739 kJ/kg, the cleanliness index drops to 0.96. The residence time of flue gas in the high-temperature zone of the first flue duct is less than 2 s, which is insufficient to effectively suppress dioxin formation. Therefore, steady combustion control measures are necessary. Both biomass and natural gas steady combustion can effectively increase the temperature of the incineration furnace; however, biomass, as a carbon-free energy source, significantly reduces carbon emissions compared with natural gas. A biomass-mixed control model for steady combustion of low-calorific-value waste was constructed and validated, achieving precise residence times in the high-temperature zones of 2.18 and 2.11 s, both exceeding 2 s, thereby achieving the desired control effect.
为了解决低热值垃圾焚烧过程的不稳定性并抑制有毒二噁英的产生，本研究以一座600吨/日的垃圾焚烧炉为例进行了研究。利用床层计算软件FLIC和Fluent对焚烧过程进行了数值模拟。定义了垃圾焚烧清洁指数，探讨了入炉垃圾热值降低对焚烧炉内温度分布的影响。比较了生物质稳定燃烧与天然气稳定燃烧的效果，建立了低热值垃圾生物质稳定燃烧控制模型。结果表明，入炉垃圾热值降低会降低清洁指数；当热值为4739千焦/千克时，清洁指数降至0.96。烟气在第一烟道高温区的停留时间小于2秒，不足以有效抑制二噁英的形成。因此，需要采取稳定燃烧控制措施。生物质和天然气稳定燃烧都能有效提高焚烧炉温度；然而，生物质作为无碳能源，与天然气相比，显著减少了碳排放。构建并验证了低热值垃圾生物质混合稳定燃烧控制模型，在高温区的精确停留时间分别为2.18秒和2.11秒，均超过2秒，从而达到了预期的控制效果。
