生物质再燃焦管道喷射脱汞性能

doi:10.16085/j.issn.1000-6613.2018-1647

摘要/Abstract

摘要：

采用高温携带流反应装置在1050℃和1150℃条件下制备了稻壳再燃焦（RH1050和RH1150）和小麦秸秆再燃焦（WS1050和WS1150），并分别将其与燃煤灼烧飞灰混合制成相应的脱汞吸附剂。在吸附剂管道喷射脱汞实验装置上，研究了生物质种类、吸附温度、初始汞浓度和烟气组分（SO₂、NO和HCl）对生物质再燃焦管道喷射脱汞性能的影响，并结合生物质及其再燃焦的理化特性分析，探讨了单质汞（Hg⁰）脱除机理。结果表明：4种生物质再燃焦平均脱汞效率相差不大，约为30%，稻壳再燃焦的脱汞效率略高于小麦秸秆焦。随着吸附温度的升高，RH1050脱汞效率持续增加，RH1150脱汞效率则呈现波动变化趋势。随着初始汞浓度的升高，稻壳再燃焦的平均脱汞效率均呈现先增大后减小的趋势，初始汞浓度为25μg/m³时RH1050和RH1150的平均脱汞效率最大，分别为35.6%和37.1%。SO₂对生物质再燃焦管道喷射脱汞具有一定的抑制作用，NO具有一定促进作用，而HCl的促进作用更为显著，且当HCl浓度大于50μL/L时，生物质再燃焦的平均脱汞效率均在90%以上。

关键词: 生物质再燃, 生物质焦, 管道喷射, 脱汞, 烟气组分

Abstract:

Biochars (called RH1050, RH 1150, WS1050 and WS1150) were prepared under reburning with biomass of rice husk and wheat straw at 1050°C and 1105°C in an entrained flow reactor, and four kinds of sorbents for mercury removal were obtained through blending above biochars and calcined coal-fired flyash, respectively. Elenmental mercury (Hg⁰) removal characteristics of different sorbents was carried out in an in-duct sorbent injection apparatus. The effects of biomass species, adsorption temperature, initial mercury concentration, and flue gas components (SO₂, NO and HCl) on Hg⁰ removal were analyzed, and mercury removal mechanism was also discussed. The obtained results indicated that the average mercury removal efficiency of four biochars is around 30%, and mercury removal efficiency of RH-biochar is a little bit larger than that of WS-biochar. Mercury removal efficiency of RH1050 continuously increases with the increase of adsorption temperature, but mercury removal efficiency of RH1150 presents fluctuating trend. The average mercury removal efficiency of RH-biochar behaves the trend of increase first and decrease later, and the maximum average mercury removal efficiencies of 35.6% and 37.1% through in-duct injection of RH1050 and RH1150 are achieved at initial mercury concentration of 25μg/m³. The presence of SO₂ suppresses Hg⁰ removal, NO enhances Hg⁰ removal, and HCl has a significant promoting effect. The average mercury removal efficiency can achieve more than 90% while HCl content in the simulated flue gas is larger than 50μL/L.

Key words: biomass reburning, biochar, in-duct sorbent injection, mercury removal, flue gas component

中图分类号:

X511

卢平, 史加腾, 叶扬天, 蒋何伟. 生物质再燃焦管道喷射脱汞性能[J]. 化工进展, 2019, 38(05): 2471-2478.

Ping LU, Jiateng SHI, Yangtian YE, Hewei JIANG. In-duct injection mercury removal characteristics of biochar prepared under biomass reburning condition[J]. Chemical Industry and Engineering Progress, 2019, 38(05): 2471-2478.

图/表 9

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样品	工业分析			元素分析					Cl	Y	R₁
样品	A_d	FC_d	V_d	C_d	H_d	O_d	N_d	S_d	Cl	Y	R₁
RH	13.14	17.88	68.98	44.30	6.35	35.30	0.58	0.32	0.24	—	—
WS	9.83	17.46	72.71	39.17	5.63	42.34	2.55	0.48	0.72	—	—
RH1050	66.16	22.01	11.82	28.40	1.38	3.36	0.51	0.19	0.13	19.86	89.36
RH1150	69.88	22.91	7.21	27.11	1.24	1.10	0.52	0.15	0	18.80	100
WS1050	52.57	38.27	9.16	42.73	1.98	2.17	0.46	0.09	0.16	18.69	95.87
WS1150	56.66	43.34	7.36	39.87	1.85	1.06	0.44	0.12	0	17.34	100

样品	工业分析			元素分析					Cl	Y	R₁
样品	A_d	FC_d	V_d	C_d	H_d	O_d	N_d	S_d	Cl	Y	R₁
RH	13.14	17.88	68.98	44.30	6.35	35.30	0.58	0.32	0.24	—	—
WS	9.83	17.46	72.71	39.17	5.63	42.34	2.55	0.48	0.72	—	—
RH1050	66.16	22.01	11.82	28.40	1.38	3.36	0.51	0.19	0.13	19.86	89.36
RH1150	69.88	22.91	7.21	27.11	1.24	1.10	0.52	0.15	0	18.80	100
WS1050	52.57	38.27	9.16	42.73	1.98	2.17	0.46	0.09	0.16	18.69	95.87
WS1150	56.66	43.34	7.36	39.87	1.85	1.06	0.44	0.12	0	17.34	100

样品	S _BET/m²·g^-1	V _M/mm³·g^-1	V _T/mm³·g^-1	X/%	D _a/nm
飞灰	1.55	0.81	2.87	28.22	7.41
RH	1.23	0.67	1.96	34.18	6.37
WS	1.28	0.66	2.11	31.28	6.59
RH1050	176.92	93.87	111.40	84.26	2.52
RH1150	190.31	99.88	119.40	83.64	2.51
WS1050	146.27	77.05	93.12	82.74	2.55
WS1150	169.45	89.90	113.70	79.06	2.69

样品	S _BET/m²·g^-1	V _M/mm³·g^-1	V _T/mm³·g^-1	X/%	D _a/nm
飞灰	1.55	0.81	2.87	28.22	7.41
RH	1.23	0.67	1.96	34.18	6.37
WS	1.28	0.66	2.11	31.28	6.59
RH1050	176.92	93.87	111.40	84.26	2.52
RH1150	190.31	99.88	119.40	83.64	2.51
WS1050	146.27	77.05	93.12	82.74	2.55
WS1150	169.45	89.90	113.70	79.06	2.69

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