CO2-水处理准东煤钠脱除效果研究

摘要

为解决新疆准东高钠煤在燃烧利用时所引起的锅炉结渣与沾污等问题,采用CO2-水处理方法进行煤燃前脱钠,在煤液比为1∶20的混合液中,在保持一定的水浴温度和搅拌转速100 r/min的条件下,持续通入CO2,考察了煤样粒度、CO2通入时间和温度对脱钠效果的影响.结果表明:在CO2通入时间为24 h的常温常压CO2-水处理过程中,煤样粒径的减小有利于提升脱钠率,粒径为0.1～0.2 mm时,脱钠率达到86.1％,在常温常压下CO2通入6h后可以脱除大量的水溶钠和部分有机钠,脱钠率达到83.1％,温度升到40℃时加剧了煤中水溶钠、醋酸铵溶钠、稀盐酸溶钠的脱除效果,脱钠率可达到88.3％,达到了燃烧锅炉对煤质的要求.%In order to solve the problems of boiler slagging and fouling caused by Xinjiang Zhundong high sodium coal during combustion,the CO2-water treatment method was ured to remove sodium before burning,when in the mixture of coal and liquid ratio of 1 ∶ 20,maintaining a certain water temperature and stirring speed of 100 r/min with the conditions of ventilation with carbon dioxide gas,different particle size of coal,the ventilation time of carbon dioxide and temperature on the influence of sodium effect were investigated.The results showed during CO2-water pretreatment under normal temperature and normal pressure when the time of 24 hours of CO2 ventilation,while the decrease of particle size could facilitate increase the sodium removal efficiency,sodium removal efficiency reached 86.8％ when particle size of coal was 0.1～ 0.2 mm.Under the normal temperature and atmospheric,It could be removed large amounts of water soluble sodium and part of the organic sodium after six hours with carbon dioxide,sodium removal efficiency reached 83.1％.When the temperature rose to 40 ℃,it increased the removal effect of water soluble in sodium,sodium ammonium acetate solution,dilute hydrochloric acid soluble sodium in coal,sodium removal efficiency could reach 88.3％,which had reached the requirements of coal burning boiler.