Temperature is an important factor

Temperature is an important factor affecting the quality of the distillation column, and also an important factor affecting the product quality. If you want to ensure the product quality, you need some control measures to reduce the impact of temperature on the distillation column. The design of temperature control scheme needs to pay attention to the following contents: in the case of constant pressure in the distillation column, there is a direct corresponding relationship between product composition and temperature, and the fluctuation of pressure will affect the effect of temperature control.The specific analysis is as follows: if it is ordinary distillation, there is no great requirement for the purity of the product. At this time, the small fluctuation of pressure has a great impact on the temperature control, which can be ignored; if it is a precise distillation, there is a higher requirement for the purity of the product. At this time, even a very small pressure fluctuation will have a great impact on the product quality.In the design of temperature control scheme, first of all, it should be clear that the tower top temperature can accurately reflect the actual quality of tower top products, correspondingly, the tower bottom temperature can also show the actual quality of tower bottom products, so the main control content of temperature is the control of tower top temperature and tower bottom temperature. However, in the actual control operation, the technical requirements are relatively high, which is mainly because the components of top products and bottom products are relatively close, that is to say, in the actual distillation process, there will not be too obvious temperature difference between the top temperature and the bottom temperature of the distillation column, and the ordinary temperature detection instrument can not effectively capture the temperature changes of each other The method of controlling the temperature of tower top and bottom is not practical. In order to effectively distinguish the actual changes of tower top temperature and tower bottom temperature, and achieve the purpose of temperature index control, we can use the sensitive plate temperature control product quality index, and effectively improve the product quality through the sensitive plate temperature control scheme of distillation section and stripping section.In the actual design of temperature control scheme, it is necessary to scientifically select the detection points of tower top temperature and tower bottom temperature. Only by ensuring the correctness of temperature detection points can good control effect be achieved. In the design, it is necessary to clearly divide the tower top temperature, tower bottom temperature and sensitive plate temperature, and select the tower bottom or tower top temperature whose product composition remains basically unchanged as the reference temperature, and the sensitive plate temperature is another influence temperature, because the tower top and tower bottom temperature are greatly affected by the pressure but not affected by the product composition, and the sensitive plate temperature is affected by both the product composition and the pressure change Therefore, the actual temperature difference control should be the temperature control of sensitive plate with compensation.