The process technologies,selection of equipment and its corrosion in the production of potassium sulphate from potassium chloride and ammonium sulphate are discussed. 提出以硫酸铵和氯化钾为原料，复分解制取农用硫酸钾的工艺条件及工艺流程，并探讨生产中设备选择及腐蚀问题。
Presents the general ventilation and air conditioning schemes for removing indoor excessive heat in a substation, and summarizes the calculation methods of equipment selection. 摘要介绍了变配电机房消除室内余热常用的通风空调方案，并总结了设备选择的设计计算方法。
