The paper shows the results of the experimental measurements and the numerical simulation of the flow-circulation type reactor pump main characteristics. The mathematical model based on Navier-Stokes equations and standard k-epsilon turbulence model was used for the pump CFD simulation. The pump power consumption was calculated by the proposed CFD post-processing method. It is found that the simulation error of the proposed method is not more than 2.9%. The obtained results include the regression equations of the pump full pressure, the pump feed and the power consumption at the pump cross-points.

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A technological scheme is given for removing hydrochloric acid vapor from air together with the parameters of the plant operation with Venturi tubes and air flow up to 76000 m 3 /h. With an initial content of hydrochloric acid in air of 250 mg/liter, the final content is as follows: with the solution in the etching bath at 60-70°C it is 1.5 mg/m 3 , while at 80°C it is not more than 5 mg/m 3 .As part of the program for rebuilding the Magnitogorsk Metallurgical Combine (MMK) in 2004, there was reconstruction of the etching section of the sheet rolling plant, in which the etching of the hot-rolled strip was transferred to hydrochloric acid from sulfuric.This gave obvious advantages: the production volume was increased while the quality of the etched steel strip was improved. However, there were then tighter requirements for the equipment for trapping the hydrochloric acid vapor in the air leaving the etching bath.The main specification is a low concentration limit for HCl in the discarded air, which should not exceed 5 mg/m 3 ; at the same time, reliability is required in prolonged operation with this corrosive air discharge, in which the content of vapor and droplets of hydrochloric acid in the air initially attains 250 mg/m 3 . The conditions for modifying the process within the existing production area gave rise to constraints on the size and location of the plant.All these conditions and requirements were borne in mind in choosing the method of treating the air discharges, designing and making the nonstandard equipment, installing auxiliary plant, and general installation and commissioning operations, which were carried out by the Mashprom Company.The usual standard ways of trapping gases in packed, bubble, and hollow spray columns are inapplicable because they are cumbersome for high gas throughputs (in the present case, 75000 m 3 /h), while the equipment is not transportable and the design of the components and units is complicated in order to provide good corrosion protection [1][2][3][4][5][6].We chose a way of trapping HCl vapor by the use of a high-speed direct-flow sprayer of ejector type with Venturi tubes [7,8], which provided the best match to requirement as regards simple design, operation with a corrosive medium, and handling large gas volumes (up to 100,000 m 3 /h).There is nothing in the technical literature on trapping HCl vapor from gases, especially in Venturi tubes. Therefore, we estimated the rate and completeness of the trapping in this case from experience with trapping CO 2 , SO 2 , H 2 S, and other discharges in Venturi tubes [1].

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