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一、问题的引入尿素高压洗涤器中段为内径959mm的立式列管式高压热交换器(见图1)。共有φ25×2的316L不锈钢列管496根,工作介质为甲铵、氨、二氧化碳,操作压力为140kgf/cm~2。
First, the introduction of the problem The middle of the high pressure washer for the internal diameter of 959mm vertical tube type high-pressure heat exchanger (see Figure 1). There are altogether 496 316L stainless steel tubes with φ25 × 2. The working medium is ammonium methylate, ammonia and carbon dioxide. The operating pressure is 140kgf / cm ~ 2.