Effects of calcium-based additives on sulfur release during decoupling combustion of different coals

doi:10.16085/j.issn.1000-6613.2022-0136

Abstract

Abstract:

Sulfur oxides emitted by coal combustion have caused environmental pollution problems and attracted increasing attention. Based on one-stage and two-stage horizontal furnaces, the effects of temperature, coal type and CaO on the release of SO₂ were explored under traditional combustion and decoupling combustion. The results show that there are differences in the SO₂ release for different coals. Under both of combustion modes, when the temperature rises, the amount of SO₂ released from the combustion of different coals increases continuously, and the SO₂ release curve changes from a single-peak distribution to a double-peak distribution. In traditional combustion, after the addition of CaO, the desulfurization efficiencies of bituminous coal, anthracite and lignite can reach more than 70%, while the efficiency of high-chlorine coal is only 12.09% to 20.45%; with the increase of temperature, the desulfurization efficiencies of bituminous coal, lignite and high-chlorine coal slightly decrease at first, then increase and decrease, while the efficiency of bituminous coal gradually decreases. In decoupling combustion, after the addition of CaO, the desulfurization efficiencies of bituminous coal and anthracite coal are 42.35%—76.23%, it is 21.35%—52.63% for lignite, and the efficiency of high-chlorine coal is still low, ranging from 8.93% to 10.57%; with the increase of temperature, the desulfurization efficiencies of bituminous coal, lignite and high-chlorine coal increase at first and then decrease,while the desulfurization efficiency of bituminous coal gradually decrease. In decoupling combustion, the total release of SO₂ from different coals is more than that in traditional combustion, and the desulfurization efficiency with the addition of CaO is lower than that in the traditional combustion.

Key words: coal, decoupling combustion, sulfur release, calcium oxide, dry desulfurization

摘要：

煤燃烧后排放的硫氧化物导致的环境污染问题已经引起人们的日益关注。基于一段式和两段式卧式炉，本文探究在传统燃烧和解耦燃烧条件下，温度、煤种以及CaO对燃煤释放SO₂规律的影响。试验结果表明：不同煤种的SO₂释放规律存在差异。随着温度的升高，不同煤种燃烧SO₂的释放量均不断增加，硫的动态析出曲线逐渐由单峰分布转化为双峰分布。传统燃烧模式下，添加的CaO对烟煤、无烟煤和褐煤脱硫效率可以达到70%以上，高氯煤脱硫效率则较低，仅有12.09%～20.45%；随温度升高，烟煤、褐煤和高氯煤的脱硫效率呈现先略微下降，后升高再下降的趋势，烟煤脱硫效率则逐渐降低。解耦燃烧模式下，CaO对烟煤、无烟煤脱硫效率在42.35%～76.23%，褐煤在21.35%～52.63%，高氯煤脱硫效率仍然较低，在8.93%～10.57%；随温度升高，烟煤、褐煤和高氯煤的脱硫效率呈现先增加后降低的趋势，烟煤脱硫效率逐渐降低。解耦燃烧模式下，不同煤种SO₂的总释放量大于传统燃烧模式，添加CaO后脱硫效率小于传统燃烧模式。

关键词: 燃煤, 解耦燃烧, 硫释放, 氧化钙, 干法脱硫

CLC Number:

X701.3

DONG Kun, ZHAO Xu, YANG Fuxin, TAN Houzhang, LEI Yanzhou, CHEN Zhanjun. Effects of calcium-based additives on sulfur release during decoupling combustion of different coals[J]. Chemical Industry and Engineering Progress, 2022, 41(S1): 595-605.

董琨, 赵旭, 杨富鑫, 谭厚章, 雷廷宙, 程占军. 钙基添加剂对不同煤种解耦燃烧下硫释放的影响[J]. 化工进展, 2022, 41(S1): 595-605.

Figures/Tables 10

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煤种	工业分析/%				元素分析/%
煤种	A_ad	V_ad	FC_ad	M_ad	C_d	H_d	N_d	S_d	O_d
烟煤	12.64	28.91	52.18	6.28	67.61	3.42	0.40	1.81	13.27
无烟煤	14.33	9.60	75.12	0.94	74.99	2.73	0.52	1.16	6.14
褐煤	15.95	31.30	43.01	9.72	60.54	3.66	0.42	1.04	16.67
高氯煤	4.26	30.00	48.02	17.72	64.37	3.92	0.33	0.14	26.06

煤种	工业分析/%				元素分析/%
煤种	A_ad	V_ad	FC_ad	M_ad	C_d	H_d	N_d	S_d	O_d
烟煤	12.64	28.91	52.18	6.28	67.61	3.42	0.40	1.81	13.27
无烟煤	14.33	9.60	75.12	0.94	74.99	2.73	0.52	1.16	6.14
褐煤	15.95	31.30	43.01	9.72	60.54	3.66	0.42	1.04	16.67
高氯煤	4.26	30.00	48.02	17.72	64.37	3.92	0.33	0.14	26.06

煤种	空气干燥基全硫S_t，ad/%	硫酸盐硫 S_s，ad/%	硫化铁硫 S_p，ad/%	有机硫 S_o.ad/%
烟煤	1.81	0.61	0.68	0.52
无烟煤	1.16	0.10	0.40	0.66
褐煤	1.04	0.02	0.32	0.70
高氯煤	0.14	0.02	0.04	0.08

煤种	空气干燥基全硫S_t，ad/%	硫酸盐硫 S_s，ad/%	硫化铁硫 S_p，ad/%	有机硫 S_o.ad/%
烟煤	1.81	0.61	0.68	0.52
无烟煤	1.16	0.10	0.40	0.66
褐煤	1.04	0.02	0.32	0.70
高氯煤	0.14	0.02	0.04	0.08

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