化工毕业设计--二氧化碳的吸收

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1、 摘要 二氧化碳的吸收再生过程主要是由吸收、闪蒸和气提三部分组成。本次设计 选用的脱碳剂是聚乙二醇二甲醚（NHD） ，属于物理吸收法。主要的设备是吸收 塔和气提塔。在计算的过程中，首先根据所给的物料组成和工艺条件进行物料恒 算和热量恒算，再进行塔设备的计算、校核及辅助设备的计算或选型。 吸收段的计算结果如下： 二氧化碳的脱除量 21 921.8 3 m/h，NHD 的用量 1 515 3 m/ h；塔底流出的富 液带出的热量 114 745 456.2kJ/h，溶液温度升高了 6；塔径为 2.4m，填料层高 度为 9.49m，塔压降为 2 115.5Pa。 解吸段的计算结果如下： 闪蒸出的二氧

2、化碳的量 17 217.7 3 m/ h，二氧化碳的回收率为 80%，溶液带 出的热量 88 771 324.7kJ/h，闪蒸的容积为 2.1 3 m。 气提出的二氧化碳的量 4 567.7 3 m/h，氮气的用量 9090 3 m/h；塔底流出的 贫液带出的热量 81 855 501.7kJ/h，溶液温度为 27；上段塔径 1.4m，下段塔径 1.8m，填料层高度为 5.7m，塔压降为 2021.4Pa。 关键词 吸收、闪蒸、气提 2 ABSTRACT The decarbon and regeneration of carbon dioxide process is primarily c

3、omposed by three parts: absorption, flash vaporization and gas stripping. This design uses polyethylene glycol dimethl ether (NHD) to decarbon, which is the physical absorption method. The main device is absorption column and stripper. In the process of calculation, firstly make material constant ca

4、lculation and heat constant calculation, and then is the calculation of tower equipment, checking and ancillary equipments calculation or selection. Absorption segments results are as follows: The amount of carbon dioxide removel is 21 921.8m /h and the amount of NHD is 1 515 m /h; the heat of liqui

5、d-rich flow from tower bottom is 114 745 456.2kJ/h and the temperature of solution rises 6; the tower diameter is 2.4m, the height of packing layer is 9.49m and the column pressure dropping is 2 115.5Pa. The desorption segments results are as follows: The amount of carbon dioxide flashes is 17 217.7

6、m /h, the recovery rate of carbon dioxide is 80%, the heat brought out from solution is 88 771 324.7kJ/h and the volume of flash trough is 2.1 m . The amount of carbon dioxide stripped out is 4 567.7 m /h and the amount of nitwgen is 9 090 m /h; the heat of barren liquor from tower bottom is 81855501.7 kJ/h and the temperature of solution is 28; the upper column diameter is1.4m, the lower column diameter is 1.8m and the column pressure dropping is 2 021.4Pa. Key Words: absorption