【作者】 韩方亮；

【导师】 黎国华；

【作者基本信息】 武汉理工大学 ， 机械电子工程， 2007， 硕士

【摘要】 半干法喷雾烟气脱硫技术是目前世界上技术最成熟，使用最为广泛的脱硫工艺之一。半干式脱硫塔内是SO₂气体和雾化的吸收剂的混合气—液两相流，整个SO₂的吸收过程中发生了一系列的物理、化学变化，塔内的运动情况相当的复杂。然而，流场是否稳定，喷雾器分布是否合理等等问题决定了整个脱硫系统脱硫效率的高低，因此，掌握脱硫塔内部流场的流动特性以及喷雾器的分布规律对于设计合理的脱硫塔结构，调整最佳的系统操作参数等具有十分重大的意义。本文应用计算流体力学方法，借用成熟的商用CFD软件FLUENT，以雷诺平均NS方程为控制方程，以RNGκ-ε模型为湍流模型，用离散相DPM模型对一种典型的立式半干法喷雾洗净脱硫塔内部气-液两相流场进行了模拟，结果表明：（1）就空塔而言，我们在简化模型的过程中忽略了塔内构件，削弱了流场的掺混效果，使流场发展不够充分。（2）喷雾器数量、位置上的不同分布对整个脱硫塔流场产生了很大的影响（3）在实际工况中，为了提高脱硫效率和烟气日处理量，宜采用混合喷雾设置。若受实际限制只能使用单排喷雾，宜采用高位喷雾设置。（4）液滴垂直气流喷射时脱硫效果好于顺向喷射。但垂直喷射时要保证脱硫塔横截面要有足够的宽度。（5）采用垂直喷射时脱硫塔的日处理量要高于顺向喷射。（6）在本文设定的边界条件和初始条件下，最佳喷雾角度为45°。从模拟结果上来看，喷雾液滴极大的影响了脱硫塔内的流场，将部分模拟结果和前人的理论研究和实验数据相比较，在一定程度上是吻合的，这表明，本文的研究方法是可行的。更多还原

【Abstract】 The SDFGD is one of the best abroad used desulphurization systems in the word. The flow field in absorber is a gas-solid two phase flow of SO₂ air and the atomization absorbefacient. During the desulphurization, a series of physics and chemistry change would happen; the situation in the absorber is very complex. But the situation with flow field and the position with spray is decide the desulphurization efficiency. So, in order to design reasonable absorber and adjust optimal operation parameters, a good grip on the flowing characteristies of absorber flow field and rules of spray is very essential and significant.In the paper, the numerical calculation of the gas-solid two phase flow in desulphurization absorber is being solved with the turbulence k-e model, Reynolds NS equation and disperse phase DPM model, and by virtue of a mature commercial CFD code FLUENT. The calculation result shows that:（1） The absorber without spray, the flow field expend no enough, because predigesting the absorber model.（2） The spray number and position is heavily impact on the flow field in absorber.（3） In real work, it is better using mix spray for improving the desulphurization efficiency, it is better using high position spray if the real work situation need.（4） The desulphurization efficiency with uprightly spray is better than parallel spray, but, it need enough width in uprightly spray.（5） The absorber’s workload in a day with uprightly spray is better than. parallel spray.（6） the best spray angle is 45°with the boundary situation in this paper.From the results of simulation, spray droplet heavily impacts on the flow field, Some simulation results are compared with the theoretic calculation and the experimental data, and they are shows a good consistency. The method of the desulphurization process is right.更多还原