半干法脱硫灰生产蒸压砖技术研究

发布时间：2018-04-30 17:54

本文选题：半干法脱硫 + 脱硫灰　；参考：《华北电力大学》2015年硕士论文

【摘要】：随着我国控制和削减SO2排放力度的不断加大,电厂锅炉烟气脱硫已进入快速发展阶段。但随之产生了大量脱硫废弃物的处置问题,尤其半干法脱硫过程中产生的脱硫灰,由于其物化特性,难以实现综合利用,由于缺乏先进的半干法脱硫灰综合利用技术,目前该类脱硫灰以堆放和抛弃处置为主,对环境造成了一定程度的污染,对企业形成了较大的压力。因此,如何实现半干法脱硫灰综合利用己成为国家和企业亟待解决的重大问题。本文以半干法脱硫灰为主要原料制备蒸压砖,对蒸压砖的制备原理进行系统分析研究,并研究了蒸压砖强度形成机理。研究了以半干法脱硫灰为主要原料制备蒸压砖的原理及其工艺,并进行工业化试验。在一系列单因子变量的基础上,探索不同配比对蒸压砖性能的影响,最终确定脱硫灰蒸压砖的最佳配方比范围。对于生产MU20强度等级脱硫灰蒸压砖,脱硫灰的掺量可控制在50%左右,生石灰的掺量控制在10%左右;对于生产MU15强度等级脱硫灰蒸压砖,脱硫灰的掺量可控制在60%左右,生石灰的掺量控制在8%左右。采用扫描电镜(SEM)、X射线能谱(EDS)和X射线衍射(XRD)三种仪器对半干法脱硫灰蒸压砖进行分析,并结合化学分析法,研究了半干法蒸压砖的强度形成机理。研究表明,脱硫灰蒸压砖的强度主要来源于以下几个方面:其一,生石灰水化反应产生胶凝性;其二,生石灰水化时产生的Ca(OH)2及脱硫灰中的石膏等激发粉煤灰的活性产生胶凝性;其三,与铝酸盐反应生成水化硫铝酸钙;其四,炉渣对强度的贡献。
[Abstract]:With the increasing control and reduction of SO2 emissions in China, flue gas desulfurization (FGD) of power plant boilers has entered a rapid stage of development. However, the disposal of a large number of desulphurization wastes has arisen, especially the desulphurization ash produced in semi-dry desulphurization process, because of its physical and chemical characteristics, it is difficult to realize comprehensive utilization, due to the lack of advanced comprehensive utilization technology of semi-dry desulphurization ash. At present, this kind of desulphurization ash is mainly stacked and discarded, which pollutes the environment to a certain extent and forms a great pressure on the enterprises. Therefore, how to realize the comprehensive utilization of semi-dry desulphurization ash has become an important problem to be solved by the country and enterprises. In this paper, autoclaved brick was prepared with semi-dry desulphurization ash as the main raw material. The preparation principle of autoclaved brick was studied systematically, and the mechanism of strength formation of autoclaved brick was studied. The principle and process of preparing autoclaved brick with semi-dry desulfurization ash as main raw material were studied, and the industrial test was carried out. On the basis of a series of single factor variables, the effects of different ratios on the properties of autoclaved brick were explored, and the optimum formula range of desulfurization ash autoclaved brick was finally determined. For producing MU20 strength grade desulphurization ash autoclaved brick, the content of desulfurization ash can be controlled at about 50%, the content of quicklime is about 10%, for producing MU15 strength grade desulphurization ash autoclaved brick, the amount of desulfurization ash can be controlled at about 60%. The content of quicklime is about 8%. The autoclaved brick with semi-dry desulphurization ash was analyzed by means of scanning electron microscope (SEM) and X-ray diffraction (XRD), and the mechanism of strength formation of semi-dry autoclaved brick was studied by chemical analysis. The results show that the strength of desulphurized ash autoclaved brick mainly comes from the following aspects: first, hydration of quicklime produces gelation; second, Ca(OH)2 produced by hydration of quicklime and gypsum in desulphurization ash can stimulate the activity of fly ash to produce cementitious property; third, react with aluminate to form calcium sulphoaluminate hydrate; fourth, the contribution of slag to strength.
【学位授予单位】：华北电力大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：X773;TU522.1

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