Automated calculation of a three-vane propeller mixer for production of the sulfur-containing sorbent based on chlorolignin selective to heavy metal ions

Abstract

Automation of the calculation of the physical properties of the ingredients of a two-phase (liquid-solid) working medium and the hydrodynamics of a mixing device for a batch reactor used in the production of a sulfur-containing sorbent based on chlorolignin has been performed. The sorbent is selective for a number of heavy metal ions. Based on the results of calculating the physical properties of the ingredients, a review of the design of mixing devices, a three-blade propeller mixer was used in the experimental reactor for mixing the working medium with a dynamic viscosity coefficient of 6.01 centipoise and a solid phase content of 31.8%. Since it was found in the 70s of the 20th century that, due to the incompatibility of the criteria for the similarity of chemical and mass transfer processes, a large-scale transition in a reactor based on physical similarity is practically impossible, then with a large-scale transition from a laboratory facility to a small production facility with a capacity of 200 kg of sulfur of the sorbent per cycle, instead of physical similarity, computational methods were used. It should be noted that an increase in the scale of the installation to M = 104 will not affect the ratio of ingredients used to obtain a new sorbent (by analogy with cooking a dish in larger quantities and in a larger container: the cooking recipe will not change, the mass of ingredients will increase in accordance with the scale), only the times of mixing, heating to 40-45 ° C and subsequent cooling of the mixture to 20 ° C can change. The physical properties of solid ingredients were determined by reference books (for chlorolignin - experimentally). Known additive models were used to calculate the physical properties of liquid ingredients and their mixtures. A technological scheme for the production of new sulfur-containing sorbents has been developed. The profile of the peripheral speed is calculated, which quadratically increases to the maximum value on the circle, which coincides in diameter with the mixer. In the peripheral zone, the peripheral velocity hyperbolically decreases down to the reactor wall. Found: the parameters of the mixer, the average speed of the working medium in the volume of the reactor, the mixing power, the depth of the formed funnel and the power consumption for mixing the medium.