Equilibrium of the decarbonization system
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Let’s discuss the mass balance and heat balance of carbon dioxide removal using the Phenylphol solution. At low load, what temperature should the rich liquid be above? Last edited in this post by yunanshu on 2008-1-27 13:51]
The main factors affecting the horizontal balance of the decarbonization system include the pressure and temperature of the shift gas before it enters the absorption tower (which affect the amount of water entering the system), the pressure and temperature of the purified gas, as well as the pressure of the carbon dioxide product (which affects the amount of water leaving the system). The values can be determined by calculating based on these parameters and the process load. This post was last edited by yunanshu on 2008-1-27 13:51.]
Generally, a temperature range of 100–110°C is sufficient.
When filling it up, we generally keep it below 118 degrees, but under light load it drops to around 108 degrees; at this point, it’s difficult to maintain a stable equilibrium for the solution. This post was last edited by yunanshu on 2008-1-27 13:52.]
Depending on the various processes, the influencing factors differ, as does the control temperature. The water balance is primarily influenced by the amount of steam added during the conversion process and the amount of condensate recovered. Due to the extremely high COD levels in the condensate, which leads to significant pollution, it is necessary to minimize the amount of water entering the system, for example by reducing the amount of steam used in the conversion process. The heat balance is primarily determined based on the actual decarburization and purification effects. Heat balance and water balance are interrelated.
This problem is easy to solve – basically, the design values are quite similar. In my plant, the temperature at the inlet of the absorption tower is set at 81 degrees, the temperature of carbon dioxide is 35 degrees, and the temperature of the purified gas at the outlet is 78 degrees. During winter, the temperature of carbon dioxide is lower, around 25 degrees, while the temperature of the purified gas remains around 75 degrees. The inlet temperature is mainly used as a means of adjustment, typically kept between 78 and 81 degrees, with adjustments made as appropriate based on the water balance conditions