随着网络技术的不断进步，网络教学近年来得到了飞速发展。作为一门省级优秀课，我们在课程建设的过程中不断探索更好的教学模式，利用计算机网络的方便快捷，实时应用的特点，打破了传统教学模式师生不能实时互动的缺点，更大地激发了学生自主学习的兴趣，而且也可以将所有最好的教学资源共享。

Through 4.2MW water-fire tube shell hot water boiler hydrodynamic experiment and calculation, the attained data are analyzed and certified the circulation velocity in raisers may be largely increased by installing sprayer - supply water injectors in downcomers inlet and water circulation reliabilities are ensured.

The article mainly aims at the problem of gasification-sootless combustion boilers that was discovered in one pracitically enviromental test,analyzes the reason and puts forward to the combustion charactertistics of gasification-sootless combustion boilers and some suggestion.