In-plant experimental study on desulfurized flue gas corrosion

doi:10.11949/j.issn.0438-1157.20180328

Abstract

Abstract:

Based on the need to increase the height of the exhaust plume and the whitening of the flue gas, the wet flue gas after the wet desulfurization of the flue gas of the coal-fired boiler must be properly disposed. However, the wet flue gas after wet desulfurization is very corrosive and will cause serious corrosion to downstream equipment. In this paper, in-plant corrosion tests were conducted in the flue after the wet desulphurization system in a 91 MW coal-fired travelling grate heating boiler. Five common corrosion-resistant steels including ND steel, 304 L, 316 L, 2205 and 2507 were tested and then evaluated. According to the results, surface temperature of the steel was the key factor in corrosion process. As the surface temperature increased, corrosion of the steels was first exacerbated due to the increase in Cl^? concentration in the deposits and then mitigated due to the lack of the electrolyte.

Key words: coal combustion, deposition, flue gas, corrosion, flue gas reheater, exhaust fumetransparentization

摘要：

基于提升排放烟羽高度以及排烟脱白的需求，必须对燃煤锅炉烟气湿法脱硫后的湿烟气进行妥当处理。但湿法脱硫后的湿烟气腐蚀性很强，将对下游设备造成严重腐蚀。本文在91 MW层燃供热锅炉湿法脱硫系统后烟道进行了现场腐蚀实验，测试和评估了5种钢材的耐腐蚀能力。实验结果表明，钢材的表面温度对腐蚀过程具有关键影响。随着表面温度的升高，钢材的腐蚀程度首先因为表面沉积物中氯离子浓度升高而加剧，然后因电解质的匮乏而减轻。

关键词: 煤燃烧, 沉积物, 烟道气, 腐蚀, 烟气再热器, 排烟脱白

CLC Number:

TK 16

Peiyuan PAN, Heng CHEN, Jian JIAO, Zhiyuan LIANG, Qinxin ZHAO. In-plant experimental study on desulfurized flue gas corrosion[J]. CIESC Journal, 2019, 70(1): 161-169.

潘佩媛, 陈衡, 焦健, 梁志远, 赵钦新. 湿法脱硫后烟气腐蚀现场实验研究[J]. 化工学报, 2019, 70(1): 161-169.

Figures/Tables 16

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实验钢材	C	Si	Mn	P	S	Ni	Cr	Cu	Mo	N	Sb	Fe
ND钢	0.078	0.26	0.48	0.012	0.010	—	0.90	0.37	—	—	0.060	Bal.
304L	0.019	0.36	1.28	0.029	0.004	8.15	18.14	0.09	—	—	—	Bal.
316L	0.020	0.40	1.45	0.018	0.002	10.73	16.97	0.12	2.47	—	—	Bal.
2205	0.016	0.37	1.12	0.026	0.001	5.74	22.06	0.24	3.13	0.17	—	Bal.
2507	0.018	0.25	0.77	0.015	0.001	7.08	25.18	0.21	3.89	0.27	—	Bal.

实验钢材	C	Si	Mn	P	S	Ni	Cr	Cu	Mo	N	Sb	Fe
ND钢	0.078	0.26	0.48	0.012	0.010	—	0.90	0.37	—	—	0.060	Bal.
304L	0.019	0.36	1.28	0.029	0.004	8.15	18.14	0.09	—	—	—	Bal.
316L	0.020	0.40	1.45	0.018	0.002	10.73	16.97	0.12	2.47	—	—	Bal.
2205	0.016	0.37	1.12	0.026	0.001	5.74	22.06	0.24	3.13	0.17	—	Bal.
2507	0.018	0.25	0.77	0.015	0.001	7.08	25.18	0.21	3.89	0.27	—	Bal.

循环水温度	类型	Fe	Cr	Ni	O	S	Cl	Ca	Al	Si	Mg
50℃	ND钢表面沉积物	14.69	—	—	56.13	14.42	—	13.23	0.87	0.66	—
	ND钢表面腐蚀产物	51.37	—	—	35.15	13.48	—	—	—	—	—
	2205表面沉积物	—	—	—	49.58	20.80	—	24.64	2.65	2.33	—
60℃	ND钢表面沉积物	16.86	—	—	39.34	12.44	9.73	15.46	0.73	1.16	4.28
	ND钢表面腐蚀产物	53.78	—	—	28.60	3.56	12.91	—	—	—	1.15
	304L表面沉积物	8.48	2.33	1.07	29.18	17.02	10.03	22.69	—	2.37	6.83
	304L表面腐蚀产物	41.54	11.62	3.83	19.73	2.37	13.26	2.78	—		4.87
	316L表面沉积物	4.89	—	—	52.83	15.18	2.32	19.88	—	3.68	1.22
	316L表面腐蚀产物	50.80	9.04	3.86	18.53	3.97	7.54	2.06	—	1.02	3.18
	2205表面沉积物	49.23	9.64	4.24	16.74	5.94	9.13	4.08	—	—	1.41
	2507表面腐蚀产物	6.37	1.33	—	40.28	15.35	8.96	19.73	1.49	2.51	3.98
70℃	ND钢表面沉积物	7.45	—	—	38.15	14.50	13.52	19.11	0.67	1.46	5.14
	ND钢表面腐蚀产物	51.71	—	—	32.36	3.76	8.89	—	—	—	3.28
	304L表面沉积物	4.74	—	—	43.34	14.88	14.46	16.21	—	—	6.37
	304L表面腐蚀产物	43.84	11.58	3.03	18.88	1.00	14.54	—	—	1.90	5.23
	316L表面沉积物	3.47	—	—	38.34	16.29	12.02	19.87	2.73	1.94	5.34
	316L表面腐蚀产物	43.38	8.33	2.91	30.93	4.02	10.43	—	—	—	—
	2205表面腐蚀产物	42.29	8.25	3.97	18.24	5.35	10.60	7.94			1.41
80℃	ND钢表面沉积物	6.86	—	—	46.55	19.56	5.74	18.91	0.57	0.55	1.26
	ND钢表面腐蚀产物	61.38	—	—	28.84	3.02	6.76
	316L表面沉积物	11.51	—	—	45.63	11.32	3.28	17.03	2.11	4.18	4.94

循环水温度	类型	Fe	Cr	Ni	O	S	Cl	Ca	Al	Si	Mg
50℃	ND钢表面沉积物	14.69	—	—	56.13	14.42	—	13.23	0.87	0.66	—
	ND钢表面腐蚀产物	51.37	—	—	35.15	13.48	—	—	—	—	—
	2205表面沉积物	—	—	—	49.58	20.80	—	24.64	2.65	2.33	—
60℃	ND钢表面沉积物	16.86	—	—	39.34	12.44	9.73	15.46	0.73	1.16	4.28
	ND钢表面腐蚀产物	53.78	—	—	28.60	3.56	12.91	—	—	—	1.15
	304L表面沉积物	8.48	2.33	1.07	29.18	17.02	10.03	22.69	—	2.37	6.83
	304L表面腐蚀产物	41.54	11.62	3.83	19.73	2.37	13.26	2.78	—		4.87
	316L表面沉积物	4.89	—	—	52.83	15.18	2.32	19.88	—	3.68	1.22
	316L表面腐蚀产物	50.80	9.04	3.86	18.53	3.97	7.54	2.06	—	1.02	3.18
	2205表面沉积物	49.23	9.64	4.24	16.74	5.94	9.13	4.08	—	—	1.41
	2507表面腐蚀产物	6.37	1.33	—	40.28	15.35	8.96	19.73	1.49	2.51	3.98
70℃	ND钢表面沉积物	7.45	—	—	38.15	14.50	13.52	19.11	0.67	1.46	5.14
	ND钢表面腐蚀产物	51.71	—	—	32.36	3.76	8.89	—	—	—	3.28
	304L表面沉积物	4.74	—	—	43.34	14.88	14.46	16.21	—	—	6.37
	304L表面腐蚀产物	43.84	11.58	3.03	18.88	1.00	14.54	—	—	1.90	5.23
	316L表面沉积物	3.47	—	—	38.34	16.29	12.02	19.87	2.73	1.94	5.34
	316L表面腐蚀产物	43.38	8.33	2.91	30.93	4.02	10.43	—	—	—	—
	2205表面腐蚀产物	42.29	8.25	3.97	18.24	5.35	10.60	7.94			1.41
80℃	ND钢表面沉积物	6.86	—	—	46.55	19.56	5.74	18.91	0.57	0.55	1.26
	ND钢表面腐蚀产物	61.38	—	—	28.84	3.02	6.76
	316L表面沉积物	11.51	—	—	45.63	11.32	3.28	17.03	2.11	4.18	4.94

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