在介绍喷射鼓泡塔烟气脱硫(flue gas desulfurization,FGD)及带托盘的喷淋塔烟气脱硫工艺的基础上,详细对比和分析了两种不同塔型烟气脱硫技术的钙硫比、脱硫效率、水耗及电耗,得出结论:鼓泡塔的烟气脱硫率较高,可控性较强,但是工艺复杂...在介绍喷射鼓泡塔烟气脱硫(flue gas desulfurization,FGD)及带托盘的喷淋塔烟气脱硫工艺的基础上,详细对比和分析了两种不同塔型烟气脱硫技术的钙硫比、脱硫效率、水耗及电耗,得出结论:鼓泡塔的烟气脱硫率较高,可控性较强,但是工艺复杂,系统阻力比较大,烟气含尘量大的电厂不适用;带托盘的喷淋塔烟气脱硫率稍低,但能满足环保要求,工艺简单,便于检修,适用性较强。提出以下建议:电厂设计时,应根据现场不同情况和具体的要求,选择不同的烟气脱硫技术。展开更多
A transient two-phase and three-dimensional computational fluid dynamics(CFD)simulation within the Eulerian framework has been carried out to investigate the influence of drag models on the radial gas hold-up profile ...A transient two-phase and three-dimensional computational fluid dynamics(CFD)simulation within the Eulerian framework has been carried out to investigate the influence of drag models on the radial gas hold-up profile of a bubble column.The effect of the sparger modeling is investigated as well.It can be concluded that:(1)the approximate modeling method for the sparger in this work is capable of reasonably predicting the radial gas holdup profile;(2)the CFD simulation with the Tomiyama’s drag model differs little from the Ishii-Zuber drag model at the low superficial velocity,while at the high gas velocity,the former leads to an over-prediction of the gas hold-up profile;(3)the correction factor of drag coefficient has a larger influence on the radial gas holdup profiles for high superficial gas velocity than low velocity.展开更多
文摘在介绍喷射鼓泡塔烟气脱硫(flue gas desulfurization,FGD)及带托盘的喷淋塔烟气脱硫工艺的基础上,详细对比和分析了两种不同塔型烟气脱硫技术的钙硫比、脱硫效率、水耗及电耗,得出结论:鼓泡塔的烟气脱硫率较高,可控性较强,但是工艺复杂,系统阻力比较大,烟气含尘量大的电厂不适用;带托盘的喷淋塔烟气脱硫率稍低,但能满足环保要求,工艺简单,便于检修,适用性较强。提出以下建议:电厂设计时,应根据现场不同情况和具体的要求,选择不同的烟气脱硫技术。
文摘A transient two-phase and three-dimensional computational fluid dynamics(CFD)simulation within the Eulerian framework has been carried out to investigate the influence of drag models on the radial gas hold-up profile of a bubble column.The effect of the sparger modeling is investigated as well.It can be concluded that:(1)the approximate modeling method for the sparger in this work is capable of reasonably predicting the radial gas holdup profile;(2)the CFD simulation with the Tomiyama’s drag model differs little from the Ishii-Zuber drag model at the low superficial velocity,while at the high gas velocity,the former leads to an over-prediction of the gas hold-up profile;(3)the correction factor of drag coefficient has a larger influence on the radial gas holdup profiles for high superficial gas velocity than low velocity.
