Pool-type condenser
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What are the similarities and differences between pool-type condensers and vertical high-pressure ammonium methanate condensers? This post was last edited by lxq700918 on 2009-2-10 18:16.]
The pool-type condenser functions both as a high-pressure ammonium methanate condenser for producing ammonium methanate, and as a synthesis tower for producing urea; in other words, part of the urea is generated within the pool-type condenser. Moreover, when driving, only heating for passivation is required; there is no need to increase pressure after heating for passivation as is the case with high-pressure ammonium methoxide condensers in order to start operation. This post was last edited by ymtuegj12 on 2009-2-9 13:00.]
Similarities and differences between pool condensers and high-pressure ammonium methanate condensers: The principles behind both are essentially the same, as they both utilize the heat of reaction to generate steam at 0.4 MPa. In the methylammonium condenser, the contact time between ammonia and CO2 is short, so the reaction of methylammonium dehydration to form urea hardly occurs. The horizontal condenser (pool-type condenser), on the other hand, not only generates steam but also accelerates the urea reaction, reducing the load on the synthesis tower. Pool-type condensers are characterized by a larger volume, higher operating temperature, lower pressure drop, and smaller cooling area. At the same time, the sensitivity to deviations in the ammonia-to-carbon dioxide ratio is reduced compared to the original process. Pool-type condensers are installed horizontally. The tube bank produces low-pressure steam (0.4 MPa); the gaseous phase surrounding the tube bank condenses, and ammonium carbamate, unreacted ammonia, and carbon dioxide are generated and thoroughly mixed in the pool condenser. During this process, the carbamate separates from water to produce urea. The pool-type condenser has a large reaction capacity, allowing the entire reaction to reach equilibrium. The horizontal installation of the pool-type condenser significantly reduces the height of the entire unit.
Provide a link: http://bbs.hcbbs.com/viewthread.php?tid=244107. There are relevant discussions inside for your reference.
60% of the urea is produced in the pool-type condenser, thereby **reducing** the volume of the urea tower. Moreover, due to the horizontal structure, stress corrosion of the tube bundles caused by chloride ions in the condensate is avoided. This post was last edited by Fan Zhou Wu Hu on 2009-2-10 02:41.]