Unfortunately , the engine room was incommodious , resulting in the air inlet muffler too close to the generator unit and making it inconvenient for maintenance staff to perform operation . in a spirit to avoid such an awkward situation and save the investment on muffling treatment , we suggest the following solution be adopted in future construction of engine rooms 例如我们以前治理过的某个油机房其进风口外为防火通道，不能占用，进风消音器只能安装在油机房内，而油机房内部空间设计又过小，就造成进风消音器距发电机组过近，维护人员操作起来很不方便。
For hoods with shutters in four sides , the results show : 1 ) the hoods positively placed boards are called hoods used for venting airflow ; hoods negatively placed boards are called hoods used for leading airflow ; 2 ) among the hoods used for venting airflow , the most effective hoods should have positive declining angle value of 30 , the ratio 4 of areas between the four windward faces and the gular section ( fy / fj = 4 ) , the value of b range from 70 mm to 120 mm and the value of b / h range from 0 . 5 to 0 . 6 ; 3 ) the most effective hoods should have negative declining angle value of 60 , the ratio 4 of areas between the four windward faces and the gular section ( fy / fj = 4 ) , the value of b range from 100 mm to 170 mm ( the optimum value is 120 mm ) and the value of b / h range from 1 . 4 to 2 . 2 ( the optimum value is 2 . 0 ) 对于四面设百叶型风帽，计算表明: l )正装倾斜挡板的百叶型风帽可认为是排风型风帽，倒装挡板倾斜的百叶型风帽可认为是进风型风帽; 2 )排风型风帽中，挡板正装30 ” 、风帽四个迎风面的有效面积fy和风管净断面积fj的比值( fy肠)为4 、挡板宽度b在70inln到120inln之间、板间距比值陇在0 . 5到0 . 6的百叶型风帽排风效果最好; 3 )进风型风帽中，挡板倒装装60 “ 、风帽四个迎风面的有效面积和风管净断面积的比值( fy例)为4 、挡板宽度b在100咖到170mm之间( 120mm为最佳) 、板间距比值陇在1 . 4到2 . 0的进风型风帽( b爪= 2 . 0为最佳)的百叶型风帽进效果最好。
The dehydration time is square of the droplets diameter so the small diameters of the droplets can cut down the drying time then reduce the height of the drying chamber . to the combined spin - flow pressure spray drying , the diameters of droplets are small and the dehydration rate is higher so keeping the qualities of the dried products we can increase the speed of the inlet wind and reduce the temperature of the outlet wind thus can improve the evaporation intensity of the drying chamber and the average energy utilization of the drying equipment 因雾滴的脱水时间与其直径的平方成正比，减小液滴直径有利于缩短干燥脱水时间，可有效降低干燥塔的高度；由于旋流式组合压力喷嘴雾化滴径的减小，脱水速度明显加快，在不影响干燥物料性质的前提下，适当提高进风温度，同时有效地降低排气温度，有利于提高干燥塔的蒸发强度，也有利于提高干燥设备的平均能源利用率。
For shelters , the results show : 1 ) to reduce the raining drops entering into the inlet and to decrease the influence of the vortex , the declining angle of 45 is recommended for the shelters ; 2 ) it is better to choose those shelters which are longer 100 mm ~ 200 mm than the height of the inlets , as they may protect the room from rain 对于单侧百叶风口的挡雨板，计算表明: 1 )为了防止雨水随空气流入自然进风口，并且使风口尽量少受涡流区的影响，建议选用倾斜角度为45 “的挡雨板; 2 )建议选用长度比风口高度长100mm - - 200 “的挡雨板，可以较好的避免挡雨板过短将雨水带入室内和过长影响风口进风的情况。
