掺固硫灰干粉砂浆的性能研究

对掺固硫灰干粉砂浆的性能进行了研究。讨论了固硫灰细度、掺量及与粉煤灰复掺对干粉砂浆工作性能、力学性能和膨胀性的影响。结果表明：经预处理固硫灰可以应用于干粉砂浆中,且掺量为10%时效果最佳。固硫灰与粉煤灰等矿物掺合料复掺可以改善干粉砂浆性能。     

Effect of curing conditions on the hydration and performance of CFBC ash cementitious system

Circulating fluidized bed combustion （CFBC） ash can be used as supplementary cementitious material for concrete production for its high pozzolanic activity. We investigated the effect of curing conditions on the hydration and performance of CFBC ash-Portland cement system （30： 70, by mass） including hydration products, paste microstructure, linear expansion ratio, chemically combined water content and compressive strength. The results show that tobermorite rather than ettringite is generated under the condition of autoclaved curing. The expansion and mortar strength of the system cured in water is higher than those cured in air at a given age, and the strength and bulk volume may retract under the condition of air curing. In addition, autoclaved curing facilitates the increase of strength gain at early curing ages （the increase rate lowers down in the following ages） and the improvement of system volume stability. It is suggested that sufficient water is necessary for the curing of CFBC ash cementitious system, and autoclaved curing may be considered where volume stability is a primary concern.     

CFBC锅炉安全经济运行中三大顽症的治理之一——CFBC锅炉入炉煤颗粒度优选及煤的制备

煤的制备系统能否提供符合要求的入炉煤是CFBC锅炉安全、经济运行的根本保证。通过对入炉煤颗粒度对CFBC锅炉的流化质量、燃烧效率与脱硫效率、传热系数以及对炉内受热面和炉壁磨损的影响的定性和定量的分析,并结合实验和实测的数据,指出对于入炉煤粒径范围的选择,不仅要限制其最大的颗粒直径,更重要的是选择合理的颗粒筛分分布,保证有足够的循环物料量。为CFBC锅炉的经济运行及其煤的制备系统的合理设计指明了方向。     

一种减少烧高硫燃料带来SO2污染的重要途径--用循环流化床燃烧技术改造旧锅炉

用循环流化床燃烧技术改造旧锅炉，烧高硫燃料，在国内外得到了很好的发展。章总结了国内外用循环流化床燃烧技术改造旧锅炉，烧高硫燃料的一些典型示范工程。这些示范工程的成功经验证实：旧锅炉改循环流化床燃烧锅炉烧高硫燃料，是减少SO2污染的重要途径之一，是切实可行的。     

活化方式对CFBC脱硫灰自硬化性能的影响

通过物理粉磨、化学激发和物理-化学联合激发3种方式系统研究了循环流化床锅炉燃烧脱硫灰(CFBC脱硫灰)物理力学性能的变化规律,并采用水化热,FTIR,XRD和SEM测试方法分析了活化方式对CFBC脱硫灰自硬化水化历程及性能的影响机理.结果表明:物理粉磨、化学激发和联合活化均提高了脱硫灰的自硬强度及水化反应程度,且降低了需水量比.与原状CFBC脱硫灰相比,粉磨后试样需水量比降低了13％(质量分数),7,28d抗压强度分别提高了210.0％,25.4％;改性剂A,B加入后混磨试样需水量比降低了19％,7,28 d抗压强度各自提高了337.0％,96.5％.在相同的A掺量下,CFBC脱硫灰与A混合后混磨试样的强度效果优于粉磨后A的外加.CFBC脱硫灰的主要水化产物为AFt,Ca(OH)2,CaSO4·2H2O,C-S-H凝胶.     

降低130t/h循环流化床锅炉磨损的措施探讨

窑街劣质煤热电厂 1 30t/h循环流化床锅炉金属件和耐磨材料在运行中磨损严重 ,导致经常性爆管停炉。为解决这一技术难题 ,在锅炉运行实践中 ,通过调整参数、改造系统等方法摸索出一些减少磨损的途径 ,为循环流化床的使用和发展积累了经验。     

循环流化床锅炉燃烧系统的模块化仿真模型

在STAR－90一体化仿真支撑系统下，开发了循环流化床锅炉（CFBB）燃烧系统主要过程的仿真算法，并采用工程块化建模方法建立了大型CFBB燃烧系统的仿真模型。仿真试验表明，所建立的模型运行稳定,可以正确反应实际系统的工作过程。工程模块化的CFBB燃烧系统仿真模型，通过合理的系统分解和模块结构设计，可以使得模型的修改量降到最小，模型的表现形式与实际过程的流程相似，更利于用户理解和掌握。     

CFBC固硫灰水泥早期强度性能研究

以CFBC(循环流化床)固硫灰为水泥混合材,CFBC固硫灰掺量、固硫灰级配、水胶比、激发剂种类和激发剂掺量等为变量,系统研究了CFBC固硫灰水泥砂浆试块3 d/28 d强度性能.采用SEM对CFBC固硫灰水泥在有无激发剂情况下的水化过程机理进行了分析,并对CFBC固硫灰水泥应用上进行了改进和建议.     

Experimental trends of NO in circulating fluidized bed combustion

Experimental trends for the dependence of CO, NO and N₂O emissions on bed temperature and oxygen concentration in circulating fluidized bed combustion (CFB) are presented. The main focus is on the nitrogen emission formation in the lower furnace area. A test campaign including seven tests with a laboratory scale CFB test rig were carried out to produce appropriate data of the phenomena. These experiments show that NO emissions above the dense bed decrease with decreasing temperature or oxygen concentration. Instead, N₂O emissions increase when the bed temperature is decreased and decrease when the oxygen concentration is decreased. These trends can partly be explained by heterogeneous reactions between NO and char, since decrease in temperature or oxygen concentration increases the bed char inventory. However, oxygen and temperature also affect directly on NO emissions. Correlations for the CO, NO, N₂O, NH₃ and HCN concentrations at the exit of dense bed were developed. This type of correlations can, among other things, be applied as boundary conditions to the more sophisticated CFD models that are usually applied to modelling of diluted part of the furnace. CFD modelling of the dense bed area is complicated and accuracy is not sufficient, thus simplified experimental correlations can aid in the development of furnace design towards better emission performance.     

CFBC固硫灰地质聚合物强度性能研究

100%以CFBC(Circulating Fluidized Bed Combustion)固硫灰为胶凝材料,采用碱激发方法,选取水玻璃模数、激发剂含碱量、养护温度、养护时间和碱液陈化温度等为变量,系统研究了其对CFBC固硫灰地质聚合物砂浆试块强度性能的影响。结果表明当水玻璃模数为1,养护温度60℃,养护时间3 h,陈化温度为50℃时,砂浆块的抗压强度最高。