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对某一硝基甲苯精馏装置建立了模型,对现场操作参数进行了分析,指出了各塔存在较大的节能潜力。以T4塔为例,通过分析进料位置和回流量对能耗的影响,得出最优的进料位置和回流量,降低了再沸器蒸汽量。通过塔顶发生低压二次蒸汽,节约了循环水,副产蒸汽还可以给其他设备使用。通过上述方法,整个硝基甲苯精馏装置可以节省再沸器蒸汽4.2 t·h~(-1),循环水274.4 t·h~(-1),每年节省费用439.8万元。
A model of a nitrotoluene rectification plant was established and the operating parameters of the site were analyzed. It is pointed out that there is a great energy saving potential in each tower. Take T4 tower as an example, through analyzing the influence of feed position and back flow on energy consumption, the optimal feed position and backflow are obtained, and the amount of steam in reboiler is reduced. Low-pressure secondary steam occurs through the top of the tower, saving the circulating water, by-product steam can also be used for other equipment. Through the above method, the whole nitrotoluene rectification device can save 4.2 t · h -1 of reboiler steam and 274.4 t · h -1 of circulating water, and save an annual saving cost of 4.368 million yuan.