Calculation of gas velocity in the shafts of four-barrel smokestacks

A review and analysis of the methods for designing chimneys of thermal power plants (TPPs) is made. It is shown that the main provisions of the methodology developed back in the USSR are relevant at the present time. The main feature of those provisions of the methodology is that the value of money was taken constant. Taking into account modern economic conditions and changes in prices for electricity, materials and wages, it was possible to develop a more general methodology that is more effective than the best foreign analogues.In Thermal Engineering this technique was modernized in terms of calculating 3-barrel chimneys with shafts of various diameters. For this, for the first time, an analytical dependence was obtained for calculating the diameter of the outer reinforced concrete shell for 3 shafts of different diameters.In this work, a further extension of the application of this technique to 4-barrel pipes is made. It was possible for the first time to obtain an analytical solution for finding the diameter of a reinforced concrete chimney for 4 shafts of different diameters. It is shown that the gas velocities must be chosen depending on the flow rate and temperature in each barrel.The analysis of the main modern price support for the construction of 4-barrel chimneys is given. Multivariate exemplary calculations are given for both real and prospective cases of flue gas evacuation.