Brief analysis on roof gas accident in a multi - shaft - mouth zoned bottom airway and its preventive measure 多井口分区式井底进风大巷高顶瓦斯事故浅析及防范措施
Discusses the feasibility of natural smoke extraction and the parameter in detail and the conditions of natural ventilation 讨论了自然排烟的可行性及相关参数的量化和自然进风的条件。
Private intilted air course makes sure the materials in the girding chamber enter into the mill along the inclined plane 独特设计向内倾斜的风道，确保迸入进风窝壳内的物料能顺利地沿着斜面落入磨机内。
Lower inlet style means the dusty flow inlet is situated on the lower part of the bag - house , and the direction of flow is opposite to that of dust precipitastion 下进风是指含尘气体流入口位于袋室下部，气流与粉尘沉降方向相反。
Boiler combustion efficiency is improved due to the retrofit for burner material , air flow adjustment mechanism and air direction of entering burner , and cold and hot commissioning 通过对燃烧器材料、调风机构、进风方式及调节等方面进行改造，并经过冷、热态调试后， # 1锅炉燃烧状况得到改善，经济性得到提高。
2 . build a mathematic model of variable capacity system , simulate the steady - state performances of three different structures , and obtain their trends of performances and compositions with inlet temperature of evaporator descending 建立了变浓度容量调节的数学模型，对三种不同结构的系统进行了稳态模拟，得出其各自性能及组分随蒸发器进风温度的下降而变化的趋势。
From the experiments and analysis , below results were gotten : ( 1 ) it was benefited to reduce the emisses of nox that the tangential reburning system was used , which was as the same as the test results before in our lab 分析研究发现：采用四角进再燃风方式，将有利于降低nox的排放。本次实验在再燃风进风方式的结论与我们研究室前期的研究工作的结论是一致的。
Compared theoretical results with experimental data , it shows that heating / cooling capacity reduces when inlet temperature of evaporator is decreasing , which is not satisfied room comfortable demand at low temperature environment in winter condition 结果表明：随着蒸发器进风温度的降低，系统的吸热量和制热量都会减少，不能满足冬季工况低温环境下室内舒适性的要求。
Cooling capacity increases with the raising of the flowing out temperature , and decreases with the raising up of the air temperature . the energy consumption increases with the increasing of the temperature of the water flowing out of the evaporator , and the environment air temperature 制冷量是随冷水出水温度的增加而增加，并随环境进风温度的增加而减少，机组的功耗是随冷水的出水温度的增加而增加，并随环境温度的增加而增加。
The main research contents are as follows : 1 . build a steady - state simulation model of a general heat pump system , calculate system performances of using r22 and ( 30 / 70wt % ) r32 / r134a as refrigerants respectively , and get their performance curves as the working conditions change 主要研究内容如下： 1建立了常规热泵系统的稳态仿真模型，对采用r22和( 30 70wt ) r32 r134a为制冷工质的系统分别进行了计算，得出其各自性能随蒸发器进风或冷凝器进水温度变化的关系。
