Pei Chenglin, Ma Li, Xia Tiantian, Li Sheng
Anhui Conch Environment Group Co., Ltd., Wuhu241005China.
School of Mechanical, Electronic and Control Engineering, Beijing Jiaotong University, Beijing100044China.
ACS Omega. 2023 Jan 17;8(4):4081-4091. doi: 10.1021/acsomega.2c07032. eCollection 2023 Jan 31.
In this paper, the fly ash cyclic gradient washing dechlorination process is systematically studied through experiments, and the effects of process parameters such as liquid-solid ratio, the number of leaching, and process pulping on the dechlorination effect of fly ash are investigated and analyzed with the currently operating three-stage counter-current washing dechlorination process. The experimental results indicate that with the liquid-solid ratio of 3:1, the number of leaching of 4, and the primary process pulping, the chlorine content of washing fly ash is reduced to 0.5-0.6%. The Baume degree in the washing filtrate is increased to 11-12 °Bé, the total amount is reduced by about 15%, and the average turbidity value is ≤5NTU. Meanwhile, the moisture content of the washing fly ash is reduced to 28-30%. By comparing with the actual construction project, it is found that under a disposal capacity of 100 t/d, the cyclic gradient washing dechlorination process can reduce the installed power by 30.3%, the floor space by 32.9%, the treatment volume of washing filtrate by 11.1%, and the drying load by 27.9% compared to the traditional three-stage counter-current washing and dechlorination process.
本文通过实验系统研究了粉煤灰循环梯度洗涤脱氯工艺，并与目前运行的三段逆流洗涤脱氯工艺对比，考察分析了液固比、浸出次数、工艺制浆等工艺参数对粉煤灰脱氯效果的影响。实验结果表明，在液固比为3:1、浸出次数为4次、一次工艺制浆的条件下，洗涤粉煤灰的氯含量降至0.5-0.6%。洗涤滤液的波美度提高到11-12°Bé，总量减少约15%，平均浊度值≤5NTU。同时，洗涤粉煤灰的水分含量降至28-30%。与实际建设项目对比发现，在日处理量100t的情况下，与传统三段逆流洗涤脱氯工艺相比，循环梯度洗涤脱氯工艺可使装机功率降低30.3%，占地面积减少32.9%，洗涤滤液处理量减少11.1%，干燥负荷降低27.9%。
