【毕业设计】热能专业毕业设计135MW机组电厂初设及制粉系统设计.doc

摘 要 本设计题目135MW机组电厂初设及制粉系统设计。拟以新疆天业120万吨化工项目配套自备电厂为例进行设计，专题部分为制粉系统设计。 电厂的初设，包括了电厂的设计依据，电厂性质与设计规模，介绍了厂区的总体布置方案以及对机务部分做了说明， 主要包括： 1．主机设备型号和参数，技术规范； 2．燃料特性； 3．燃烧系统及辅助设备选择； 4．热力系统及辅助设备选型； 5．主厂房布置； 6．辅助设施。 专题部分是对制粉系统进行设计与计算，主要包括： 制粉系统简介及磨煤机选择; 根据煤的特性选择磨煤机。通过直吹式和仓储式系统的比较，设计中选择了仓储式系统。 仓储式制粉系统热力计算; 制粉系统热力计算是以1kg煤为基础的热平衡计算，设计中需对各管段中的风量进行调节以及对各管的管径进行计算与选择。 此外，还对其它制粉设备。如粗粉分离器、细粉分离器等设备进行选型及计算。 3．烟风煤粉管道阻力计算; 通过制粉系统中设备及管道的阻力计算，求出制粉系统的总阻力，以选择合适的一次风机。 关键词：电厂初设； 制粉系统； 仓储式 Abstract The design of the subject unit as 135MW power plant of the beginning and milling based system design. I design 1.2 million tons in Xinjiang Tianye chemical projects supporting power plant as an example, the Special part of system design for the milling. The power plant of the beginning including the design of the plant based on plant size, nature and scale of power plant design, Described the plant’s general layout and introduced the part of mechanism including: Host device models and parameters, technical specifications; Fuel Characteristics; Combustion systems and auxiliary equipment; Thermal system and auxiliary equipment selection; Main Support facilities. Special part is the design and calculation of milling system, including: Introduction and mill pulverizing system selection; The selection of mill is mainly according to the coal’s characteristic. Through compare blow comparison and storage systems. The designs select storage system. The thermodynamics calculation of storage system. This is heat balance calculation on the basis of one kilogram crude coal. In the course of the design, we should calculate the volume and diameter of all tubes, select the diameter. In addition, the other milling equipment, such as coarse separator、 powder separator and other equipment selection and calculation 3. The calculation of the tobacco air pulverized coal pipe resistance. Through the resistance calculation of equipment and duct of pulverized-coal system, then work out general resistance. Base on the calc