超声法在线测量烟气脱硫浆液粒度分布、密度方法和装置

doi:10.16085/j.issn.1000-6613.2021-1268

摘要/Abstract

摘要：

针对烟气脱硫工艺中石灰石/石膏浆液粒度、密度（浓度）在线测量需求，研究了基于超声衰减法的浆料多参数在线测量方法和装置。改进了一种自适应控制参数的差分进化算法用于颗粒粒径反演，模拟算例显示，改进差分进化算法求解精度更高；设计了非接触式测量管段，采用换能器一发一收模式，实现非接触式无损测量；开展了温度变化对声衰减影响实验，提出了声衰减量的温度修正方法。通过实验室结果验证，文中方法浓度测量结果与取样法浓度分析结果最大偏差为1.75%，最小偏差为0.59%。通过电厂测试结果验证，文中方法的粒度测量结果与显微镜图像法、激光粒度仪三者测量结果具有较好的一致性，最大偏差小于17%；密度测量结果与取样法吻合度高，最大重复性偏差仅为0.23%，单次测量结果与取样法最大偏差为0.26%，两项指标均优于差压密度计测量结果，可满足烟气脱硫工艺中石灰石/石膏浆液粒度、密度（浓度）在线测量需求。

关键词: 两相流, 粒度分布, 测量, 遗传算法

Abstract:

In this paper, the method and device for on-line measurement of the density and particle size of limestone/gypsum slurry in the flue gas desulfurization based on the ultrasonic attenuation method were studied. Improved differential evolution algorithm with adaptive control parameters was used for particle size inversion, and simulations showed that the improved differential evolution algorithm had higher accuracy. Non-contact measurement section was designed, and the independent transducer mode was adopted to realize non-destructive measurement. An experiment on the relationship between temperature and sound attenuation was carried out, and the method for correcting the sound attenuation value was proposed. A differential evolution algorithm with adaptive control parameters was studied for particle size inversion. Laboratory results verified that the maximum deviation between the concentration measurement results of the method and the concentration analysis result of the sampling method was 1.75%, and the minimum deviation was 0.59%. The test results of the power plant showed that the particle size measurement results of the proposed method were in good agreement with those of the microscope image method and laser particle size analyzer, and the maximum deviation was less than 17%. The density measurement results were in good agreement with the sampling method, the maximum repeatability deviation was only 0.23%, and the maximum deviation between the single measurement result and the sampling method was 0.26%. Both indicators were better than the measurement results of the differential pressure density meter, which could meet the requirements for online measurement of the density and particle size of the limestone/gypsum slurry in the flue gas desulfurization.

Key words: two-phase flow, particle size distribution, measurement, genetic algorithm

中图分类号:

TK31

田昌, 苏明旭, 蒋瑜, 夏多兵. 超声法在线测量烟气脱硫浆液粒度分布、密度方法和装置[J]. 化工进展, 2021, 40(12): 6516-6522.

TIAN Chang, SU Mingxu, JIANG Yu, XIA Duobing. Method and device for on-line measurement of particle size distribution and density of desulfurization slurry by ultrasonic[J]. Chemical Industry and Engineering Progress, 2021, 40(12): 6516-6522.

图/表 11

参考文献 16

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统计粒径	电厂石膏粒度分布/μm
统计粒径	A1	A2	A3	A4	B1	B2
D10	21.22	20.43	19.80	19.31	15.35	16.88
D40	28.19	29.04	28.75	27.86	23.83	22.16
D50	29.58	30.97	31.80	29.97	25.45	26.04
D90	37.34	38.52	38.91	37.07	31.48	32.81
D［4，3］	30.21	31.13	31.66	29.93	25.45	24.68

统计粒径	电厂石膏粒度分布/μm
统计粒径	A1	A2	A3	A4	B1	B2
D10	21.22	20.43	19.80	19.31	15.35	16.88
D40	28.19	29.04	28.75	27.86	23.83	22.16
D50	29.58	30.97	31.80	29.97	25.45	26.04
D90	37.34	38.52	38.91	37.07	31.48	32.81
D［4，3］	30.21	31.13	31.66	29.93	25.45	24.68

项目	取样法 /kg·m^-3	超声法 /kg·m^-3	差压密度计 /kg·m^-3
测量样本算术平均值	1154.92	1154.33	1168.83
最大重复性偏差/%	0.18	0.23	1.11
算术平均值偏差/%	—	0.05	1.20
单次测量最大偏差/%	—	0.26	1.81

项目	取样法 /kg·m^-3	超声法 /kg·m^-3	差压密度计 /kg·m^-3
测量样本算术平均值	1154.92	1154.33	1168.83
最大重复性偏差/%	0.18	0.23	1.11
算术平均值偏差/%	—	0.05	1.20
单次测量最大偏差/%	—	0.26	1.81

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