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甲胺是重要的有机化工原料,我国甲胺生产能耗一直远远高于国际水平。为了开发甲胺生产节能流程,全流程模拟某厂甲醇气相胺化法的甲胺工艺,逐个分析系统各个用能设备的能量利用情况,找出节能的关键环节,分3个步骤改进节能,首先在合成系统合理回收能量,提高装置的能量利用效率,能耗下降37%;再模拟优化分离系统5个精馏塔,找到最佳的操作参数,能耗下降20%;最后通过热量集成进一步节能18%。优化后的节能新工艺比原来节能36%,中压蒸汽、高压蒸汽、循环水消耗量降幅分别达50%、22%、40%,节省操作费用464万元/a,只增加少量设备投资,节能效果和经济效益显著。甲胺产品质量较优化前有提高。新的节能工艺为甲醇新装置的设计和原有装置的改造提供有益的参考。
Methylamine is an important organic chemical raw material, the energy consumption of methylamine production in our country has been far above the international level. In order to develop the energy-saving process of methylamine production, the whole process simulates the methylamine process of methanol vapor phase amidation in a certain plant and analyzes the energy utilization of each energy-using equipment of the system one by one to find out the key aspects of energy saving and improve energy conservation in three steps In the synthesis system, a reasonable recovery of energy, improve the energy efficiency of the device, energy consumption decreased by 37%; then simulated the optimal separation system 5 distillation column, to find the best operating parameters, energy consumption decreased by 20%; Finally, further integration of heat energy savings 18%. The optimized energy-saving new process saves 36% of the original energy, and the consumption of medium-pressure steam, high-pressure steam and circulating water drops by 50%, 22% and 40% respectively, saving operation cost of 4.64 million yuan / a, only adding a small amount of equipment investment, Energy-saving effect and significant economic benefits. Methylamine product quality has been improved before optimization. The new energy-saving process provides a useful reference for the design of the new methanol plant and the retrofit of the original plant.