Heating centralized is an important thing in the north . whether this is implemented in a large scale has contributed to impove city modern level and ameliorate atmosphere environment . the traditional heating system are two - upright - pipe - parallel system , two - pipe system , single - pipe - stride system etc , whose calculation for heat charge is either by man or by ic installed on the caliduct . therefore , the problem arise that heat provided does n ' t accord with heat charge payed , not secure , and resident have to suffer much 传统的供暖系统有双立管水平式系统、全双管系统、单管跨越式系统等，其计费方式要么为人工计费，要么是利用安装在暖气片上的带电读卡器，这样存在着供热量与收费额匹配不准确、不安全等方面的问题，也使集中供热用户有苦难言。
Finally , the thesis employed the new combined model to simulate the dense gas - solid two - phase vertical flows , to simulate the dilute or dense gas - solid two - phase jet flows , and both of them got a satisfied numerical solution . after comparing the numerical results to experimental data , we found that they were quite agreement . it proves that the new combined model is right , accurate and reliable , and it may be suitable to simulate various dense gas - solid multiphase flows 最后，本文利用所提出的新的组合模型，对高浓度气固两相立管流动进行了数值模拟；对稀相和密相气固两相射流进行了数值模拟；两者均得到了满意的数值解；将所得数值结果与相关实验数据进行了比较，两者十分吻合，证明了本组合法在模拟高浓度气固两相流动时的准确性和可靠性，并具有一定的普适性。
The results of calculation and measures show that the low frequency of steam pipelines vibration fastens on 4 . 3 to 4 . 5 hz and 9 . 5hz , the low modes fastens on one - steps curl in vertical plane and its plane of each steam pipeline and one - rotation along with the line connecting the port circling main steam gate and the horizontal port of unit . the modes of # 3 and # 4 main steam conduits occupy the majority of low steps modes ( the five of the first eight phases ) , except for the first phase rotation vibration , the maximal distortion of other low steps vibration modes are all caused by the vibration of erect pipelines of cylinder 计算和实际测量结果表明：导汽管低频振动以4 . 3 - 4 . 5hz 、 9 . 5hz频率为主，管系的低阶模态以各导汽管在垂直导管平面和平面内的一阶弯曲、以及绕主汽门处端点与水平段汽机端连线的一阶扭转为主， # 3 、 # 4导汽管的振动模态占低阶模态的多数(前八阶模态中的五阶) ，除一阶扭转振型，导汽管的其它低阶振动模态中都是进汽缸立管的下端振动变形最大。
