Study on microwave enhanced removal performance of organic matter in coking waste salt

doi:10.11949/0438-1157.20251195

Abstract

Abstract:

The composition of coking waste salt is complex and the content of organic pollutants is high. The harmless and resource treatment of coking waste salt is a major challenge for the industry. In this paper, the physicochemical properties of coking waste salt were systematically analyzed, and the pyrolysis / combustion characteristics of coking waste salt under anaerobic and aerobic conditions were compared by thermogravimetric analysis. The effects of heating method and temperature on the removal efficiency of organic matter and the selective activation mechanism of microwave were further investigated by comparing the conventional pyrolysis and microwave pyrolysis systems. The results show that microwave pyrolysis can achieve 93% organic matter removal rate at 550 °C, which is significantly better than conventional pyrolysis. In addition, microwave pyrolysis technology also shows the comprehensive advantages of reducing reaction temperature, inhibiting the formation of CO₂ and toxic aromatic hydrocarbons, and enriching high-purity syngas. This study provides an efficient and low-pollution technical path for the controllable pyrolysis and resource utilization of coking waste salt, which has important scientific value and application prospect.

Key words: microwave pyrolysis, coking waste salt, organic matter removal

摘要：

焦化废盐成分复杂、有机污染物含量高，其无害化与资源化处理是行业面临的重大挑战。本文系统分析了焦化废盐的理化性质，并通过热重分析对比了其在无氧与有氧条件下的热解/燃烧特性。进一步通过常规热解与微波热解系统对比研究，探究了加热方式、温度对有机物去除效率的影响及微波的选择性活化机制。结果表明，微波热解在550℃下即可实现93%的有机物去除率，效果显著优于常规热解。此外，微波热解技术还展现出降低反应温度、抑制CO₂及有毒芳烃生成、并富集高纯度合成气的综合优势。本研究为焦化废盐的可控热解与资源化利用提供了一条高效、低污染的技术路径，具有重要的科学价值与应用前景。

关键词: 微波热解, 焦化废盐, 有机物脱除

CLC Number:

X 705

Fei WANG, Shixiong ZHAO, Liangzhe WEI, Xianggang LU, Hongzhou LÜ, Caihui LI. Study on microwave enhanced removal performance of organic matter in coking waste salt[J]. CIESC Journal, DOI: 10.11949/0438-1157.20251195.

王飞, 赵世雄, 卫亮哲, 鲁香港, 吕宏洲, 李彩慧. 微波强化焦化废盐中有机物脱除性能研究[J]. 化工学报, DOI: 10.11949/0438-1157.20251195.

Figures/Tables 19

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样品	工业分析(%)				元素分析(%)
样品	M	A	V	FC*	S	Na	O	CI	C *	Si	Ca
废盐	0.7	91.86	4.11	3.33	25.94	25.87	20.88	15.60	7.43	2.29	1.97

样品	工业分析(%)				元素分析(%)
样品	M	A	V	FC*	S	Na	O	CI	C *	Si	Ca
废盐	0.7	91.86	4.11	3.33	25.94	25.87	20.88	15.60	7.43	2.29	1.97

保留时间	名称	分子式	占比(%)
9.421	苯乙烯	C₈H₈	3.79
13.925	1-十二烯	C₁₂H₂₄	10.23
25.251	2,4-二叔丁基苯酚	C₁₄H₂₂O	14.57
28.285	菲	C₁₄H₁₀	4.84
30.153	含氮/硫杂环化合物	C₈H₁₅NOS	7.18
31.212	氯化苄	C₇H₇CI	22.76
36.173	邻苯二甲酸二丁酯	C₁₆H₂₂O₄	15.80
47.253	苯并蒽	C₁₈H₁₂	6.62

保留时间	名称	分子式	占比(%)
9.421	苯乙烯	C₈H₈	3.79
13.925	1-十二烯	C₁₂H₂₄	10.23
25.251	2,4-二叔丁基苯酚	C₁₄H₂₂O	14.57
28.285	菲	C₁₄H₁₀	4.84
30.153	含氮/硫杂环化合物	C₈H₁₅NOS	7.18
31.212	氯化苄	C₇H₇CI	22.76
36.173	邻苯二甲酸二丁酯	C₁₆H₂₂O₄	15.80
47.253	苯并蒽	C₁₈H₁₂	6.62

气氛	温度区间	E (kJ/mol)	ln(A) (min^-1)	R²
氮气	53~118℃	445.67	1.75	0.96505
	214~219℃	8.11	-7.17	0.96950
	558~570℃	321.15	-4.33	0.95986
	736~774℃	9503.09	11.40	0.98114
空气	53-118℃	218.26	-1.93	0.98053
	177-192℃	28.72	-6.19	0.99070
	412-418℃	14.37	-7.99	0.97024
	712-768℃	4516.97	3.80	0.96136