Inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea

doi:10.3969/j.issn.0438-1157.2013.11.042

CIESC Journal ›› 2013, Vol. 64 ›› Issue (11): 4196-4202.DOI: 10.3969/j.issn.0438-1157.2013.11.042

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Inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea

YAN Mi^1,2, YANG Jie², LI Xiaodong², HU Yanjun¹, YAN Jianhua²

1. Institute of Energy and Power Engineering, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China;
2. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, Zhejiang, China

Received:2013-04-16 Revised:2013-06-08 Online:2013-11-05 Published:2013-11-05
Supported by:
supported by the National Basic Research Program of China(2011CB201500)and the High-tech Research and Development Program of China(2012AA062803).

硫酸铵和尿素抑制飞灰合成二(口恶)英

严密^1,2, 杨杰², 李晓东², 胡艳军¹, 严建华²

1. 浙江工业大学能源与动力工程研究所, 浙江杭州 310014;
2. 浙江大学能源清洁利用国家重点实验室, 浙江杭州 310027

通讯作者: 李晓东
作者简介:严密(1985-),男,博士,讲师。
基金资助:
国家重点基础研究发展计划项目(2011CB201500);国家高技术研究发展计划项目(2012AA062803)。

Abstract

Abstract: At present,the emission of polychlorinated dibenzo-p-dioxins and dibenzofurans(PCDD/Fs)has hampered the application of combustion technology in waste clean treatment and waste to energy utilization.This study experimentally investigated the inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea at different temperatures.Some key observations were reported.Both inhibitors had higher inhibition efficiency at a high temperature(650℃)than a low temperature(350℃),while the production of PCDD/Fs at 650℃ was quite small; the main reduction of PCDD/Fs was from PCDFs,as well as,the most significant reduction of homologue was TeCDF at a low temperature(350℃)and OCDF at 650℃.In a full scale incinerator,the chemical additives injected at the high temperature section could enter the low temperature area and continued to inhibit dioxin formation,so it is necessary to do more work to evaluate different inhibitors for PCDD/Fs formation and figure out the optimal injecting temperature.

Key words: PCDD/Fs, inhibition, ammonium sulfate, urea, waste incineration

摘要： 二(口恶)英(PCDD/Fs)排放制约了当前焚烧技术在垃圾处置和资源化利用领域的应用和推广。研究了硫酸铵和尿素在不同温度下对垃圾焚烧飞灰合成PCDD/Fs的抑制能力。实验结果表明:高温下(650℃)硫酸铵和尿素对PCDD/Fs合成具有更高的抑制效率,但高温下飞灰合成PCDD/Fs量远低于低温下(350℃)的生成量;PCDD/Fs的降低量均主要来自于PCDFs的减少,并且低温下TeCDF减少量最大,而高温下减少最多的同系物为OCDF。由于实际烟道中,高温处投入的抑制剂会进入低温段继续产生抑制作用,所以仍需要更多的研究正确评价抑制剂的抑制效果和最优使用温度。

关键词: 二(口恶)英, 抑制, 硫酸铵, 尿素, 废物焚烧

CLC Number:

TK229

YAN Mi, YANG Jie, LI Xiaodong, HU Yanjun, YAN Jianhua. Inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea[J]. CIESC Journal, 2013, 64(11): 4196-4202.

严密, 杨杰, 李晓东, 胡艳军, 严建华. 硫酸铵和尿素抑制飞灰合成二(口恶)英[J]. 化工学报, 2013, 64(11): 4196-4202.

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Inhibition of PCDD/Fs formation from fly ash by ammonium sulfate and urea

硫酸铵和尿素抑制飞灰合成二(口恶)英

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