钙基脱硫剂在烟气脱硫中应用的实验研究

发布时间：2018-01-11 20:32

本文关键词：钙基脱硫剂在烟气脱硫中应用的实验研究　出处：《青岛科技大学》2015年硕士论文　论文类型：学位论文

【摘要】：二氧化硫(S02)是大气污染物的主要成分之一,严重污染环境并对人的身体健康有很大危害。其中S02的脱除一直是环境保护难题,每一年因为SO2的排放会导致巨大的经济损失,是以烟气脱硫已成为如今研究领域的热门之一。本文采用一种新型的烟气脱硫方式,利用CaS作为钙基烟气脱硫剂进行脱硫,不仅能将烟气中的SO2气体还原为硫单质,而且能够通过与化学链技术相结合,实现CaS的再生,从而实现化学链的循环反应,主要研究内容如下：首先,基于热力学定律和吉布斯自由能最小原理,利用HSC Chemistry软件对NiS-SO2、FeS-SO2、Na2S-SO2、MgS-SO2、BaS-SO2、CaS-SO2进行热力学计算与分析,模拟时调剂S02和脱硫剂的比例为2：1,并加入氮气(N2)作为保护气,经分析最终筛选出合适的CaS作为脱硫剂。生成产物CaSO4与CO和H2反应实现CaS脱硫剂再生的过程已经在化学链技术中得到应用,因而可以实现化学链循环反应。采用CaS作为脱硫剂不仅具有活性好、硫单质产率高、副反应少等优点,而且脱硫剂可循环利用。于是本文采用CaS作为钙基烟气脱硫剂对烟气脱硫进行考察研究。其次,在固定床反应器中对钙基烟气脱硫剂脱除SO2的实验进行了考察,筛选出了合适的反应条件,即：反应温度为200℃、空速为600 h-1、床高／直径比为5：2、CaS含量为40%。CO2对钙基烟气脱硫剂的脱硫实验没有影响,而CaO的脱硫效果低于CaS的脱硫效果,烟气中的O2在反应中能够提供反应热量,同时也能与部分CaS结合,使得脱硫率有所降低,但是降低不明显。钙基烟气脱硫剂在高温下会出现烧结现象,导致比表面积降低,粒径增大。另外,本文采用收缩核模型很好地对钙基烟气脱硫剂与SO2的反应进行了描述,分别考察了反应温度、SO2浓度、空速等因素对脱硫反应的影响,并对反应过程进行了线性拟合,计算出了反应活化能等因子,构造了合适的反应动力学方程。
[Abstract]:Sulfur dioxide (S02) is one of the main components of atmospheric pollutants, has great harm serious pollution of the environment and the health of people. The removal of S02 has been the environmental protection problem, every year because of the emission of SO2 will lead to huge economic losses in flue gas desulfurization has become one of the hot research field nowadays. This paper use a new type of flue gas desulfurization, flue gas as a calcium based desulfurizer using CaS, can not only restore the SO2 gas in flue gas to elemental sulfur, and can combine with chemical looping technology, then the implementation of CaS, so as to realize the chemical chain reaction cycle, the main research contents are as follows: first of all, the laws of thermodynamics and the principle of Gibbs free energy minimization based on the use of HSC Chemistry software on NiS-SO2, FeS-SO2, Na2S-SO2, MgS-SO2, BaS-SO2, CaS-SO2 by thermodynamic calculation and analysis, simulation and adjust S02 off The sulfur ratio of 2:1 (N2), and adding nitrogen as protective gas, through the analysis of the final selected CaS as a desulfurization agent. Generating CO and H2 reaction product of CaSO4 and implementation of CaS sorbent regeneration has been used in chemical looping technology, which can realize the chemical chain reaction. The CaS cycle as the desulfurization agent not only has good activity, sulfur high yield, less side reaction, and the desulfurizing agent can be recycled. So this paper uses CaS as a calcium based flue gas desulfurization of flue gas desulfurization were investigated. Secondly, in a fixed bed reactor of calcium based sorbents for the removal of SO2 were investigated experimentally and selected reaction conditions, namely: the suitable reaction temperature to 200 degrees, speed is 600 H-1, the bed height / diameter ratio of 5:2, CaS content has no effect on calcium based desulfurization experiment of 40%.CO2 flue gas desulfurization, desulfurization effect and low CaO The desulfurization effect of CaS, O2 in the flue gas to provide heat of reaction in the reaction, but also can be combined with CaS, the desulfurization rate decreased, but the decrease is not obvious. Calcium based flue gas desulfurization agent in high temperature sintering phenomenon, resulting in the specific surface area decreases, the particle size increased. In addition, this paper the shrinking core model is very good to the reaction of calcium based sorbents and SO2 are described, respectively. The effects of reaction temperature, SO2 concentration, space velocity and other factors on the impact of the desulfurization reaction, and the reaction process of the linear fit to calculate the reaction activation energy and other factors, construct appropriate reaction kinetics equation.

【学位授予单位】：青岛科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X701.3

【参考文献】