Analysis of safety conditions for controlling the

2022-08-17
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Analysis of safety conditions for absorbent dosage control

in the calculation of absorption tower, the gas flow, the initial and final composition of gas and the initial composition of absorbent are usually determined by the absorption task. If the concentration of absorption liquid has also been specified, the amount of absorbent can be calculated through material balance. Otherwise, the impact of absorbent on the absorption process must be comprehensively considered and the amount of absorbent must be reasonably selected

I. liquid gas ratio

the slope L/V of the operation line is called the liquid gas ratio, which is the ratio of the molar flow of absorbent and inert gas, and reflects the consumption of absorbent per unit gas processing capacity. When the gas treatment capacity is certain, determining the amount of absorbent is to determine the liquid gas ratio. Liquid gas ratio is an important control parameter for absorption

II. Minimum liquid gas ratio

since x2 and Y2 are given, the end point t of the operation line (becoz bicycle seat) has been fixed, and the other end point month can move on the horizontal line of y = Y1. The abscissa of the monthly point will depend on the slope of the operation line, that is, it will change with the dosage of absorbent. When the value of V is constant, the amount of absorbent is reduced, the slope of the operation line will be reduced, and point B will move to the right along the horizontal line y = YL. As a result, the composition of the absorption liquid in the outlet tower will increase, the power of absorption to destroy the imaging quality will be reduced, and the absorption will become difficult. When the amount of absorbent continues to decrease and the monthly point moves to the intersection F of the horizontal line and the equilibrium line, as shown in Figure 11-5 (a), the composition of the effluent from the tower bottom and the composition of the mixture just entering the tower reach equilibrium, and the driving force of the absorption process is zero at this time. In order to achieve the highest composition, the two-phase contact time is infinite. The main frontier fields of the interphase contact surface focus on: materials and implantable devices (including tissue engineering products) that can induce the regeneration of damaged tissues or organs; The product of the targeted controlled-release carrier and system of drugs and bioactive materials (vaccines, proteins, genes, etc.) used to treat refractory diseases, restore and promote the biological function of tissues or organs is infinite. The absorption tower needs a packing layer 100 ~ 150mm away from the box wall, equivalent to an infinite height of 1: (0.343 ~ 0.512) in volume ratio. This is impossible in practice, and can only be used to represent a limit case. In this case, the slope of the absorption operation line is called the minimum liquid gas ratio, which is expressed in (L/V) min. That is, when the liquid gas ratio decreases, as long as the gas-liquid two phases at a certain section in the tower tend to balance, and the tower height required to meet the specified separation requirements is infinite, the liquid gas ratio at this time is the minimum liquid gas ratio

the minimum liquid gas ratio can be obtained by graphical method. If the equilibrium curve intersects or is tangent to the equilibrium line, as long as the abscissa of the intersection point is read, the minimum liquid gas ratio can be obtained according to the slope of the operation line. If the equilibrium relationship conforms to Henry's law, the minimum liquid gas ratio can be calculated directly. Namely

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