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芒硝即硫酸钠,俗称圆明粉。圆明粉是近年来我国出口南朝鲜、日本以及台湾的大宗化工产品之一。据“甘肃日报”报导,玉门市化工厂所生产的圆明粉的95％出口国外。四川,新疆、云南、湖南、湖北、山东、山西、江苏等省的芒硝生产已经颇具规模。各省的年产量已超过十万吨。目前,每吨价格约为300～400元。在芒硝生产过程中,除了提高硝水的循环速度而外,重点已放在如何提高末效真空度的技术改造。在芒硝生产行业中,通常使用多效蒸发器(一般为四效,在进口的设备中,也有单效热泵式系统)。多效真空蒸发器的生产强度与总的传热温差成正比。为了增大蒸发器传热
Glauber salt sodium sulfate, commonly known as round powder. Round Mingfen is one of the bulk chemical products exported to South Korea, Japan and Taiwan in recent years in China. According to the “Gansu Daily” reported that 95% of the round flour produced by the chemical plant in Yumen City is exported abroad. The production of thenardite in Sichuan, Xinjiang, Yunnan, Hunan, Hubei, Shandong, Shanxi and Jiangsu provinces is already quite large in scale. The annual output of the provinces has more than 100,000 tons. At present, the price per ton is about 300 ~ 400 yuan. In the process of mirabilite production, in addition to increasing the circulation rate of the nitric water, the emphasis has been placed on how to improve the technical efficiency of the final vacuum. In the thenardite production industry, multi-effect evaporators (typically four-effect evaporators) are commonly used, and single-effect heat pump systems are also available in imported equipment. The production efficiency of the multi-effect vacuum evaporator is proportional to the total heat transfer temperature difference. In order to increase the evaporator heat transfer