新型低碳排放脱硫剂纳米氢氧化钙的制备、评价及应用研究

doi:10.19964/j.issn.1006-4990.2022-0467

Abstract

Abstract:

In the traditional limestone-gypsum wet flue gas desulfurization（FGD） process，the reaction of limestone and SO₂ generate a large amount of CO₂，which is not favorable to the realization of “carbon peaking” and “carbon neutralization”.By using cheap starting materials and in the presence of polyethyleneimine（PEI），a series of nanoscale Ca（OH）₂ were prepared to replace traditional limestone for FGD process.The samples were characterized by SEM，XRD，BET，and FT-IR.The effects of Ca（OH）₂ with different specific surface area and limestone on SO₂ adsorption rate and desulfurization efficiency were studied in a simulated experimental device.The results showed that when the inlet SO₂ concentration was 3 500 mg/Nm³，the desulfurization efficiency was increased from 93.05% of limestone to 99.31% of Ca（OH）₂.The actual desulfurization effect of the new nano Ca（OH）₂ desulfurizer was studied by using the wet desulfurization device of Shaoguan Power Plant Unit 1（600 MW）.The results showed that the limestone could not meet the requirements of ultra-low emission by using high sulfur coal，but after adding part of Ca（OH）₂（18.0%~22.5%），the ultra-low emission could be achieved（the outlet SO₂concentration was less than 35 mg/Nm³），and the desulfurization efficiency was all higher than 99%，thus improving the adaptability of FGD system to high sulfur coal.

Key words: nano calcium hydroxide, power plant desulfurization, polyethyleneimine, specific surface area

CLC Number:

X701.3

YAO Yong, LI Shizhu, ZHENG Dongchen, ZENG Tinghua, WU Zhichao, YU Chi, LIU Faqian. Study on preparation，evaluation and application of new low-carbon emission nano calcium hydroxide desulfurizer[J]. Inorganic Chemicals Industry, 2023, 55(4): 38-44.

Figures/Tables 9

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脱硫剂	BET比表面积/（m²·g^-1）	孔容/（cm³·g^-1）
样品1	7.525 2	0.047 213
样品2	16.839 1	0.064 264
样品3	22.337 6	0.072 513
样品4	28.793 1	0.085 151
韶关电厂用CaCO₃	2.430 2	0.010 338

组别	比表面积/ （m²·g^-1）	入口SO₂ 浓度/（mg·Nm^-3）	出口SO₂ 浓度/（mg·Nm^-3）	脱硫效率/%	SO₂吸收速率/（10^-6mol·m^-2·s^-1）
样品1	7.525 2	3 500	34.02	99.03	11.290 0
样品1	7.525 2	2 000	13.60	99.32	6.467
样品2	16.839 1	3 500	29.35	99.16	11.305 2
样品2	16.839 1	2 000	11.59	99.42	6.473
样品3	22.337 6	3 500	25.67	99.27	11.317 2
样品3	22.337 6	2 000	10.03	99.50	6.478
样品4	28.793 1	3 500	24.12	99.31	11.322 3
样品4	28.793 1	2 000	8.41	99.58	6.484
韶关电厂用碳酸钙	2.430 2	3 500	243.25	93.05	10.610 0
韶关电厂用碳酸钙	2.430 2	2 000	75.41	96.23	6.270

时间	脱硫剂	机组负荷/MW	入口SO₂ 质量浓度/ （mg·Nm^-3）	出口SO₂ 质量浓度/ （mg·Nm^-3）	脱硫效率/%
2021年 9月26日	CaCO₃	490	1 700	29	98.29
2021年 9月26日	CaCO₃+22.5% Ca（OH）₂	490	1 700	16	99.06
2021年 9月27日	CaCO₃	592	2 250	30	98.67
2021年 9月27日	CaCO₃+22.5% Ca（OH）₂	592	2 250	9	99.60
2021年 9月28日	CaCO₃	597	3 255 （高硫煤）	48.5 （排放超标）	98.51
2021年 9月28日	CaCO₃+18.0% Ca（OH）₂	597	3 255 （高硫煤）	23	99.29

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Study on preparation，evaluation and application of new low-carbon emission nano calcium hydroxide desulfurizer

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