1、 1 文献综述 摘要：摘要：隔膜法电解制得的 11%的碱液，采用三效顺流蒸发使碱液浓度达到 32% 的要求。本设计通过对整个蒸发过程进行总物料衡算，各效物料衡算，温差损失 计算， 热量衡算， 并进行多次迭代后达到一定的误差要求后算得各效的传热面积。 用物料计算的结果并综合考虑能耗和总费用等问题， 对工艺过程进行一定的改进 和优化后，再对设备的主要工艺尺寸进行计算，以达到设计的要求；对辅助设备 进行设计选型，选出适合的设备。 关键字：关键字：蒸发器，三效顺流，烧碱蒸发 2 Literature review Abstract： Diaphragm electrolysis was 11% of
2、the lye, the use of three-effect evaporation of the alkali concentration downstream 32% of the requirements. The design of the evaporation process by the total mass balance, the effective material balance, temperature loss calculations, heat balance, and multiple iterations required to achieve a cer
3、tain degree of error is considered after the effective heat transfer area. The calculated results with the material and considering issues such as energy consumption and total cost of process improvement and optimization of a certain, then the main process on the size of the device calculated to mee
4、t the design requirements; design and selection of auxiliary equipment to select the appropriate equipment. Finally, with control points to draw out the flow chart, see attached. Keywords: evaporator, three-way downstream, caustic soda evaporation 3 1.1.蒸发及蒸发流程蒸发及蒸发流程 蒸发是采用加热的方法，使含有不挥发性杂质（如盐类）的溶液沸腾，除 去其中被汽化单位部分杂质，使溶液得以浓缩的单元操作过程。 蒸发操作广泛用于浓缩各种不挥发性物质的水溶液，是化工、医药、食品 等工业中较为常见的单元操作。化工生产中蒸发主要用于以下几种目的： (1)获得浓缩的溶液产品； (2)将溶液蒸发增浓后，冷却结晶，用以获得固体产品，如烧碱、抗生素、 糖等产品； (3)脱除杂质，获得纯净的溶剂或半成品，
