Experimental study and numerical simulation of solid alkaline slag depolymerization homogenizer structure

doi:10.16085/j.issn.1000-6613.2017-1769

Abstract

Abstract: During the ammonia alkali process, a lot of caustic waste such as alkaline slag is produced. It is a technical problem in the chemical industry to solve the waste of alkali residue. Taking a chemical Co. Ltd., solid alkaline slag production during the ammonia alkaline process as the research object, the effects of homogenized fluid distribution uniformity were numerically studied. The optimum structural characteristics of homogenizer were verified by experiments. The results showed that, the particle size of solid alkaline slag is small, which has the same properties of sol. After filter presser, the particle of alkaline slag reunites, which make it has high hardness and hard to break and homogenate. It has great effect on fluid flow when increasing the rotation speed of blender, but the dead zone cannot be completely eliminated. Compared with the local-vertical blade structure, the homogeneity effect of vertical blade structure is more obvious, and the power consumption is smaller. Increasing the structure of the deflector, the power consumption reduces compared to before loading. Overall consideration, the blade structure of homogenizer blender adopt plan of horizontal-blade + vertical-blade + guide plate, which is helpful to improve the economy of the reuse of alkali residue. The research can build the foundation for the industrial application of desulfurizer for solid alkaline slag.

Key words: solid alkaline slag, desulfurizer preparation, structure optimization, experiment research, numerical simulation

摘要： 制碱工业过程产生大量碱渣等废弃物，固体碱渣再利用是化工行业技术难题。本文以某化工股份有限公司氨碱法制碱过程中产生的固体碱渣为研究对象，数值模拟研究了影响均质器内浆液分布均匀性的变化因素，通过试验验证了均质器的最佳结构特征。结果表明：固体碱渣的粒度小，具有溶胶的性质，经过压滤机压滤过后的碱渣，粒子重新团聚，硬度大、不易破碎、解聚；提高均质器的搅拌器转速对流体的流动速度及均质效果有很大改善，但并不能完全消除死区；相比于局部立式搅拌桨叶结构，采用立式搅拌桨结构的均质效果明显，且功耗更小；增加导流板结构，与未加装前相比，功耗降低，综合考虑确定均质器的搅拌器采用立式桨+平直桨+导流板的混合型桨叶结构，有利于提高碱渣再利用的经济性。本文研究结果可为固体碱渣制备脱硫剂的工业应用奠定基础。

关键词: 固体碱渣, 均质器, 结构优化, 试验研究, 数值模拟

CLC Number:

TQ074

ZHAO Bin, GAO Mingfei, DU Yajie, HUO Dianlong. Experimental study and numerical simulation of solid alkaline slag depolymerization homogenizer structure[J]. Chemical Industry and Engineering Progress, 2018, 37(06): 2101-2108.

赵斌, 高明非, 杜亚杰, 霍殿龙. 固体碱渣解聚均质器结构试验与数值模拟[J]. 化工进展, 2018, 37(06): 2101-2108.

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