EXPERIMENTAL INVESTIGATIONS ON PRESSURIZED FLUIDIZED BED COMBUSTION(PFBC)FOR HIGH ASH COAL

The first phase of the experimental investigation in our institute on pressur-ized fluidized bed combustion(PFBC)technology is introduced,and the results of fivetests are presented.The combustion efficiencies were as high as 97% 98% when high ashcontent coal was burnt in PFBC,and the sulphur retention efficiencics were 80%-85%with the Ca/S mole ratios between 1.5-1.8.The particulate content in flue gas at the out-let of high temperature gas clean-up system was 189mg/m~3(normalized).The average di-ameter of particles was 2.5-3μm and the weight fraction of particles with diameter largerthan 10μm was not greater than 3%.     

投影机光路通道除尘探讨

针对灰尘沾污投影机光路通道中各种镜头引起亮度降低、图象模糊不清的典型故障，介绍对光通道中反射镜、滤光片、分色镜、聚焦镜的拆卸和除尘过程、顺序、方法及注意事项。     

煤中灰份的快速测定

通过生产实践总结出煤样灰份快速测定方法，应用快速灰化法解决了缓慢灰化法指导发车滞后的问题。     

模块组合式脱硫除尘吸收实验装置

这是踊套具有创新性的模块组合式湿法脱硫除尘装置,使用者根据教学和科研的需要,可任意拆卸组合。其创新点是在塔的下部嵌入了一个环栅喷射鼓泡式进气装置,其新颖之处体现于:烟气稳流减压,冷却除尘,高效吸收,气力搅拌等功能可在环栅通道内一气呵成。     

直接酸解锌矿粉制取氯化锌

本文报道了以本省天然矿石粉碎而得的矿粉为原料，直接用酸分解制取氯化锌的实验过程，经硫酸除铅、钙、钡盐除多余的ＳＯ_４~（２－），再经氢氟酸除镁并深度除钙后，制得质量指标完全达到国家标准的氯化锌．该工艺能充分利用我省资源，耗能少，产品质量可靠     

条件价值法在环境治理价值评估中的运用——以长沙市扬尘治理为例

条件价值评估法是研究环境非使用价值评估的主要方法。本文尝试运用条件价值法,对扬尘治理所带来的长沙市空气质量改善的经济价值进行评估。研究结果如下：长沙市居民对长沙市扬尘治理工程改善后空气质量的平均支付意愿为每户每年71．7-72元,长沙市区扬尘治理的总价值评估为138．03亿元;支付意愿水平与被调查者的受教育程度、收入状况、对环境的认知度成正相关,与被调查者对环境的满意度成负相关,与其年龄和性别、职业关系不显著;长沙市居民偏好的支付方式主要为现金。     

选煤厂产尘环节粉尘颗粒扩散方程的建立

由风力扬起的粉尘是由不同粒径所组成的颗粒群,能否用数值方法再现出不同粒径的颗粒群的运动轨迹是预测含尘质量分数的前提和关键。从研究粉尘粒子在空间中的受力情况及在这些力作用下的运动状态,通过研究粉尘在紊流气流中的扩散规律,得出粉尘颗粒的运动轨迹,为最后达到粉尘控制奠定基础。     

几种窑型对环境影响的探讨

本文从工艺的角度分析了几种水泥生产窑型对环境的污染及原因,并进行了对比。     

Dust diffusion simulation in the third layer construction of underground powerhouse

Under forced ventilation, the dust diffusion of underground powerhouse construction is investigated using a 3D high Reynolds number k-ε model. The interfacial momentum transfers and the wall roughness in the wall function are considered. Ventilation in the third layer of underground powerhouse of Xiangjiaba hydropower station is used as a case. The geometric structure has a decisive effect on the airflow distribution. It is concluded that the dust concentration decreases gradually with the increase of the ventilation time. However, iso-concentration curves have the same tendency after 1 800 s. The dust concentration meets the ventilation and dust-prevention health standard after 2 300 s. The prediction by the present model is confirmed by the experimental measurement by Nakayama.     

PASSIM8K接装机滤嘴烟支切割鼓轮尘槽改进

通过对PASSIM接装机最后切割鼓轮尘槽进行改进,利用鼓轮体内部的负压吸风及时将切割尘末吸除,不但使成品滤嘴烟支切口光滑平整,保证了烟支的外观质量,而且也减少了打刀、同步齿形带断裂损坏等问题,减少了因频繁清理而停机的次数和维修时间,提高了设备的有效作业率.在维护和保养最后切割部件时也更加方便,节时省力.