Low temperature reduction of NO over sludge char prepared under different pyrolysis conditions

doi:10.16085/j.issn.1000-6613.2019-1509

Abstract

Abstract:

Low temperature conversion of NO over sludge char which was prepared by pyrolysis of municipal sewage sludge was experimentally investigated. The effects of pyrolysis temperature (400℃, 600℃ and 800℃) and initial moisture content (0, 66% and 80%, mass fraction) on NO conversion characteristics of sludge char were studied. The results indicated that the sludge char contains high content of iron (41.1mg/g). The increase of pyrolysis temperature can promote the formation of ferrous components (Fe₂P and FeS), improving the NO reduction ability of iron, as well as the de-NO_x efficiency of sludge char. The specific surface area of sludge was greatly promoted when sludge was pyrolyzed under higher moisture content, as well as the low temperature NO reduction performance of sludge char. Based on the analysis of specific surface area analysis, X ray diffraction (XRD) analysis, and Fourier transform infrared (FTIR) analysis, it was found that the formation of ferrous components in sludge char was the key factor influencing NO conversion, whereas the effects of the specific surface area and surface functional groups of sludge char was not obvious.

Key words: nitric oxide, denitration, sewage sludge, pyrolysis, char

摘要：

以市政污泥为原料热解制备污泥炭，开展了污泥炭催化还原NO的实验研究。考察了不同热解温度（400℃、600℃和800℃）和污泥初始含水率（0、66%和80%，质量分数）条件下热解制备的污泥炭的脱硝性能。研究表明，污泥炭中包含大量铁元素（41.1mg/g），提高热解温度可促进污泥炭中亚铁化合物（Fe₂P和FeS）的生成，使铁元素具备催化还原NO的能力，从而显著提高污泥炭的脱硝效率。提高污泥热解初始含水率可显著提高污泥炭比表面积，污泥炭对NO的低温还原能力也随初始含水率提升而显著提高。通过对污泥炭的比表面积、X射线衍射（XRD）和傅里叶红外（FTIR）分析表征，结果表明污泥炭中亚铁化合物的生成是影响NO转化的关键影响因素，而比表面积和表面官能团类型对污泥炭脱硝反应并无明显影响。

关键词: 一氧化氮, 脱硝, 污泥, 热解, 焦炭

CLC Number:

Wenyi DENG, Cong TAO, Shijuan TIAN, Andong YIN, Yaxin SU. Low temperature reduction of NO over sludge char prepared under different pyrolysis conditions[J]. Chemical Industry and Engineering Progress, 2020, 39(S1): 263-269.

邓文义, 陶聪, 田诗娟, 印安冬, 苏亚欣. 不同热解条件下制备的污泥炭低温还原NO[J]. 化工进展, 2020, 39(S1): 263-269.

Figures/Tables 8

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样品名称	灰分/%	挥发分/%	固定碳/%	比表面积/m²·g^-1	总孔容/m³·g^-1
干污泥	30.6	58.5	10.9	—	—
400℃-0%	64.1	24.1	11.8	12.3	0.032
600℃-0%	67.3	20.7	12.0	22.5	0.051
800℃-0%	82.8	6.0	11.2	40.6	0.088
800℃-66%	84.2	6.6	9.2	93.1	0.141
800℃-80%	83.4	7.7	8.9	102.4	0.125
800℃-CO₂	92.8	3.3	3.9	173.5	0.189

样品名称	灰分/%	挥发分/%	固定碳/%	比表面积/m²·g^-1	总孔容/m³·g^-1
干污泥	30.6	58.5	10.9	—	—
400℃-0%	64.1	24.1	11.8	12.3	0.032
600℃-0%	67.3	20.7	12.0	22.5	0.051
800℃-0%	82.8	6.0	11.2	40.6	0.088
800℃-66%	84.2	6.6	9.2	93.1	0.141
800℃-80%	83.4	7.7	8.9	102.4	0.125
800℃-CO₂	92.8	3.3	3.9	173.5	0.189

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