SU392947A1 - METHOD FOR AUTOMATIC CONTROL OF THE HEAT PROCESS - Google Patents

Description

The invention can be used in the chemical, food and microblogging industry. There is a known method for automatically controlling a thermal process, for example, an evaporation process by withdrawing a vapor-gas mixture from the zone of maximum accumulation of non-condensable gases. The disadvantages of this method include the limitations of its use, the low accuracy of the moment determination, for: K01Pleni noncondensing gases (NCG) and the lack of intensification of the process. In order to optimize the process of the proposed method, removal of the gas-vapor mixture is carried out depending on the ratio of the pressure of pure saturated water vapor in a closed cylinder placed in the gas-vapor mixture and having the same temperature with it, and the pressure of the gas-vapor mixture in the zone of maximum accumulation of non-condensing evaporator gases . The pressure of the mixture of ideal gases RS.CH is equal to the sum of the partial pressures of the individual components, and the partial pressure of gas to the product of the pressure of the mixture to its molar concentration: Pi - Xi PC ,, In the case of a mixture consisting of non-condensable gases (nkg) and saturated water vapor , we have: Rem Yap -f I „kg (2) 1 nkg - - g .Mj - pressure of the vapor-gas mixture (pressure in the apparatus); Yap - partial pressure of steam; HACS - noncondensable gas partial pressure; Xg is the molar concentration of non-condensable gases. From expressions 2 .and 3, the concentration of non-condensable gases is defined as:,. . Yasm - Pp 1 RFP pp - p cm cm cm The RP value is measured using a measuring cylinder filled with vapor and a liquid of the same nature as the vapor phase of the vapor – gas mixture (for evaporators it is usually water) and placed in the vapor – gas mixture evaporator. A closed cylinder has a developed contact surface with a vapor-gas mixture for