兰炭末制备水炭浆及其燃烧性能评价
发布时间：2018-11-06 11:06
【摘要】：本文以兰炭末为原料制备出新型清洁燃料-水炭浆,对我国煤化工、冶金等高耗能、高污染行业的技术升级、节能减排及产业链延伸具有重要的意义。主要研究了粒度级配、添加剂种类和复配方案、温度及搅拌作用等因素对水炭浆的粘度、流动性及稳定性等的影响规律,确定了最佳制备工艺及技术参数,并利用热重分析及Aspen Plus模拟对水炭浆的燃烧过程和燃烧性能进行了分析评价。研究表明,添加剂及粒度级配是影响水炭浆浓度、粘度和稳定性的重要因素。使用复配分散剂可以极大提高单型分散剂的分散和稳定性能,木质素磺酸钠(SL)与聚羧酸系分散剂(PC)复配后,SL弥补了PC在兰炭表面缩合芳环主体上吸附性能差的缺陷,使其立体吸附于兰炭的芳香核上,使SL和PC的分散和稳定性能得到了协同增强,当SL-PC添加量为1.0wt%、最佳配比SL:PC=2:1时的最高成浆浓度可达到65.50%。筛分分级可以获得最优级配M45um:M45μm~74um:M74μm~125um:M125μm~250um=5:2:2:1,使兰炭末(研磨时间250s)最大成浆浓度从63.53%提高到64.57%。磨制分级在研磨时间一定时,成浆性不如筛分分级,但通过增加研磨时间可获得较高的成浆浓度,当研磨时间为750s,磨制分级制浆最大成浆浓度为66.76%。高温和过度搅拌均不利于水炭浆的制备,保持适当的温度、搅拌时间及搅拌速度是制备高浓度水炭浆的关键条件。水炭浆的最佳制备工艺条件为:磨制分级750s、复配分散剂SL-PC(添加量为1.0wt%,复配比例SL:NSF=2:1)、稳定剂CMC(添加量0.02wt%)、制备温度25℃、搅拌速度800r/min和搅拌时间10min,在该条件下兰炭末的最大成浆浓度为66.02%,此时水炭浆的表观粘度为911.02mPa.s、流动时间为49s以及析水率0.56%。TG-DTG、DSC分析表明,水炭浆的燃烧过程可分为水分蒸发、挥发分析出燃烧及残炭和挥发分共同燃烧直至燃尽三个阶段,与水煤浆相比水炭浆存在热值低、燃烧滞后、着火稳定性差等缺点。Aspen Plus模拟分析结果表明,进料物流参数:兰炭末流量1000kg/hr、水量538kg/hr以及助燃空气流量9000kg/hr时,BURN温度可达1502.41℃,热量达11886MJ/hr。水炭浆燃烧过程具有燃烧高效充分(96.46%)、烟气中污染气体排放量低(NO+NO2+SO2+SO3=0.52wt%)、粉尘含量少(0.013kg/hr)且粒径小(0.32μm~0.61μm)等优点,是一种清洁高效的环保型燃料,并且兰炭末价格低廉,具有非常好经济效益和市场潜力,值得深入研究与推广应用。
[Abstract]:In this paper, a new clean fuel, water carbon slurry, is prepared from blue charcoal powder, which is of great significance to the upgrading of technology, energy saving and emission reduction and the extension of industrial chain in coal chemical industry, metallurgical industry and other high energy consuming and high pollution industries in China. The effects of particle size gradation, kinds of additives and blending schemes, temperature and agitation on the viscosity, fluidity and stability of water-carbon slurry were studied, and the optimum preparation process and technical parameters were determined. The combustion process and combustion performance of water carbon slurry were analyzed and evaluated by thermogravimetric analysis and Aspen Plus simulation. The results show that additives and particle size gradation are important factors affecting the concentration, viscosity and stability of water carbon slurry. The dispersion and stability of the monodispersant can be greatly improved by using the compound dispersant. After the addition of sodium lignosulfonate (SL) and polycarboxylic acid dispersant (PC), SL makes up for the poor adsorption performance of PC on the condensed aromatic ring on the surface of blue carbon. The dispersion and stability of SL and PC were enhanced synergistically by stereosorbent adsorption on the aromatic nuclei of blue charcoal. When the SL-PC content was 1.0 wt, the highest pulp concentration reached 65.50% when the optimum ratio of SL:PC=2:1 was 1.0 wt. The optimal gradation of M45um:M45 渭 m~74um:M74 渭 m~125um:M125 渭 m was obtained by screening and grading, and the maximum pulp concentration of blue charcoal powder (lapping time 250: 2: 1) was raised from 63.53% to 64.57%. When the grinding time is fixed, the pulping ability is not as good as sifting classification, but the higher pulp concentration can be obtained by increasing the grinding time. When the grinding time is 750 s, the maximum pulp concentration of grinding graded pulping is 66.76. High temperature and excessive stirring are not conducive to the preparation of water carbon slurry. Keeping proper temperature, stirring time and stirring speed are the key conditions for the preparation of high concentration water carbon slurry. The optimum preparation conditions of water-carbon slurry are as follows: grinding and grading 750s, compound dispersant SL-PC (1.0wtwt, SL:NSF=2:1), stabilizer CMC (0.02wt%), preparation temperature 25 鈩，
本文编号：2314090
[Abstract]:In this paper, a new clean fuel, water carbon slurry, is prepared from blue charcoal powder, which is of great significance to the upgrading of technology, energy saving and emission reduction and the extension of industrial chain in coal chemical industry, metallurgical industry and other high energy consuming and high pollution industries in China. The effects of particle size gradation, kinds of additives and blending schemes, temperature and agitation on the viscosity, fluidity and stability of water-carbon slurry were studied, and the optimum preparation process and technical parameters were determined. The combustion process and combustion performance of water carbon slurry were analyzed and evaluated by thermogravimetric analysis and Aspen Plus simulation. The results show that additives and particle size gradation are important factors affecting the concentration, viscosity and stability of water carbon slurry. The dispersion and stability of the monodispersant can be greatly improved by using the compound dispersant. After the addition of sodium lignosulfonate (SL) and polycarboxylic acid dispersant (PC), SL makes up for the poor adsorption performance of PC on the condensed aromatic ring on the surface of blue carbon. The dispersion and stability of SL and PC were enhanced synergistically by stereosorbent adsorption on the aromatic nuclei of blue charcoal. When the SL-PC content was 1.0 wt, the highest pulp concentration reached 65.50% when the optimum ratio of SL:PC=2:1 was 1.0 wt. The optimal gradation of M45um:M45 渭 m~74um:M74 渭 m~125um:M125 渭 m was obtained by screening and grading, and the maximum pulp concentration of blue charcoal powder (lapping time 250: 2: 1) was raised from 63.53% to 64.57%. When the grinding time is fixed, the pulping ability is not as good as sifting classification, but the higher pulp concentration can be obtained by increasing the grinding time. When the grinding time is 750 s, the maximum pulp concentration of grinding graded pulping is 66.76. High temperature and excessive stirring are not conducive to the preparation of water carbon slurry. Keeping proper temperature, stirring time and stirring speed are the key conditions for the preparation of high concentration water carbon slurry. The optimum preparation conditions of water-carbon slurry are as follows: grinding and grading 750s, compound dispersant SL-PC (1.0wtwt, SL:NSF=2:1), stabilizer CMC (0.02wt%), preparation temperature 25 鈩，
本文编号：2314090
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