氯化铵蒸发器结垢成分鉴别及原因分析

doi:10.11962/1006-4990.2019-0457

Abstract

Abstract:

The fouling problem often occurs in multi-effect evaporators.These affect the thermal efficiency and normal operation of the device.In order to identify the formation causes and composition of fouling in the evaporator,a series of methods,including X-ray diffraction（XRD）,plasma emission spectroscopy（ICP）,scanning electron microscopy（SEM-EDS）,polarized light microscopy,Raman spectroscopy and ion chromatography were used to characterize and analyze the unknown fouling on the ammonium chloride multi-effect evaporator of Zhejiang Dayang Biotechnology Group Co.,Ltd..The results showed that the main component of the scale is a mixture of iron phosphate,alumina and organic matter.In addition,the cause and mechanism of the scale formation was discussed and the corresponding solutions for reducing the fouling in the evaporator was also proposed.

Key words: ammonium chloride, multi-effect evaporator, scale formation, iron phosphate

CLC Number:

TQ131.72

Wang Guoping,Xu Xuhui,Li Gang,Qiu Xuhui,Liu Zhengwei. Identification and analysis of fouling composition of ammonium chloride evaporator[J]. Inorganic Chemicals Industry, 2020, 52(8): 81-83.

序号	测试元素	含量/ （mg·kg^-1）	序号	测试元素	含量/ （mg·kg^-1）
1	Mo	15.0±0.72	13	Mg	486.5±24.33
2	Sr	28.1±1.36	14	Ni	503.8±26.22
3	Sb	33.2±1.78	15	Zr	999.9±50.19
4	Ba	34.2±1.68	16	Na	1 644.0±82.21
5	Co	38.4±1.84	17	Ca	2 023.4±100.94
6	V	46.3±2.57	18	K	4 018.2±200.91
7	Hf	48.6±2.88	19	Si	7 903.3±397.19
8	W	80.2±5.03	20	Cr	11 802.5±643.32
9	Zn	115.4±4.37	21	Ti	13 112.1±655.61
10	Mn	150.6±9.16	22	Fe	60 038.5±2 587.22
11	Cu	190.4±10.31	23	Al	86 014.9±4 210.55
12	S	263.4±12.88	24	P	159 139.6±7 996.81

序号	检测项目	测试值	序号	检测项目	测试值
1	w（氟）/10^-6	未检出	8	w（SO₄^2-）/10^-6	未检出
2	w（氯）/10^-6	1.047±0.052	9	w（C）/%	6.94±0.35
3	w（溴）/10^-6	未检出	10	w（H）/%	3.556±0.18
4	w（碘）/10^-6	未检出	11	w（N）/%	5.27±0.26
5	w（CO₃^2-）/10^-6	未检出	12	w（S）/%	0.055±0.003
6	w（PO₄^3-）/10^-6	38 432±1 921	13	w（O）/%	22.343±1.12
7	w（NO₃^-）/10^-6	165±8.25

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Inorganic Acid-Base-Salt Committee of CIESC

Identification and analysis of fouling composition of ammonium chloride evaporator

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