湿法脱硫后烟气腐蚀现场实验研究

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

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.

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.

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

In-plant experimental study on desulfurized flue gas corrosion

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