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Study on Characteristics of Gas Pressure Drop and Desulfurization Performance in a Novel Co-Current Rotating

Author: DanCongYun
Tutor: ChenJianFeng
School: Beijing University of Chemical Technology
Course: Chemical Engineering
Keywords: co-current rotating packed bed monolithic SiC packing pressure drop desulfurization gas-side overall mass transfercoefficient
CLC: TQ051
Type: Master's thesis
Year: 2013
Downloads: 32
Quote: 0
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Abstract


The task of upgrade of desulfurization equipments required the new e quipments should have small volume, low pressure drop and strong corros ion resistance. The co-current rotating packed bed (CO-RPB) can exert w ork to gases with the rotational rotor, which can provide dynamic to the gases, which can satisfy some demanding occasions. The monolithic silico n carbide (SiC) packing has the advantage of corrosion resistance. This p aper studied comprehensively on the pressure drop characteristics and desu lfurization performance in a CO-RPB packed with monolithic SiC packing and provided-prephase technical support for its industrial application. The main research contents and results were as follows:1. Study on gas pressure drop characteristicsBy air-water system, according to the single factor method, effects of rotational speed, gas flow rate on the gas pressure drop were examined in the dry CO-RPB. Effects of rotational speed, gas flow rate, liquid flow rate on the gas pressure drop were investigated in the wet CO-RPB. Experimental results showed that the gas pressure drop decreased with the increase of rotational speed and increased with the increase of the gas flow rate in the dry CO-RPB. In the wet CO-RPB, the gas pressure drop decreased with the increase of the rotational speed and increased with the increase of the gas flow rate. However, the gas pressure drop was almost constant with the increase of the liquid flow rate. Under the same operating conditions, the gas pressure drop increased about9.8%after adding the static annular packing and the gas pressure drop of monolithic SiC packing increased about7.3%in contrast to stainless wire mesh. Two empirical correlations for estimating the gas pressure drop in the dry and wet CO-RPB were proposed. The deviation of gas pressure drop predicted from the two correlations was within±15%of the experimental data.2. Study on desulfurization performance by ammonia-based wet methodBy ammonia-based wet method, the effects of rotational speed, gas flow rate, liquid flow rate, inlet SO2concentration, total salt concentration, and alkalinity on the SO2removal efficiency were investigated. The results showed that the SO2removal efficiency increased with the increase of rotational speed, liquid flow rate, alkalinity and decreased with the increase of gas flow rate, SO2inlet concentration, total salt concentration. In addition, the SO2removal efficiency is increased about2.5%after adding the static annular packing. The SO2removal efficiency of monolithic SiC packing is about1.5%higher than stainless wire mesh. Finally, the gas-side overall mass transfer coefficient (Kyα) was deduced based on the mass balance, and its correlation was also proposed. The predicted Kya using the above correlation is in good agreement with the experimental data within±8%.

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