METHOD FOR AUTOCLAVING CELLULAR CONCRETE PRODUCTS Russian patent published in 2022 - IPC B28B1/50 C04B40/00 B28B5/00 B01J3/00 

FIELD: construction industry.

SUBSTANCE: invention relates to the construction industry, namely to a method for the production of building materials, and can be used, for example, in the production of cellular concrete products using autoclave technology. The method includes loading cellular concrete into an internal environment limited by the autoclave body. The autoclave is equipped with a pressure setting unit P3(t), a pressure measuring unit R_aut, a vacuum pump, and a vacuum pump drive with a power frequency converter. The program for changing the pressure in the autoclave is set during the sequential execution of technological operations: blowing, evacuating, raising the pressure, holding, lowering the pressure, measuring the pressure R_aut in the autoclave, automatically controlling the pressure in the autoclave in accordance with the program, unloading products from the autoclave. At the same time, the autoclave is additionally equipped with an automatic control system containing a unit for measuring the concentration of gas C_g in the vapor-air mixture, a regulator of the vacuum dynamics with the ability to set the required value of the gas concentration C_g³, and a unit for comparing the pressure R_aut with Р₃(t), P_min³ and P_max³. In this case, the output of the pressure setting unit Р₃(t) is connected to the first input of the pressure comparison unit R_aut with P3(t), P_min³ and P_max³, the second input of which is connected to the output of the pressure measurement unit R_aut, and the values ​​of the minimum P_min³ and maximum P_max³ pressure values ​​at the stage of evacuation. The output of the pressure comparison unit R_aut with P3(t), P_min³ and P_max³ is connected to the first input of the evacuation dynamics controller. The required value of gas concentration C_g³ in the vapor-air mixture is set to the second input of the evacuation dynamics controller. The third input of the evacuation dynamics controller is connected to the output of the unit for measuring the gas concentration C_g in the vapor-air mixture. The first output of the evacuation dynamics controller is connected to the input of a power frequency converter, the output of which is connected to the input of the vacuum pump drive, the output of which is connected to the input of the vacuum pump, at the output of which the value g_pvs of the flow rate of the steam-air mixture is formed, which enters the internal environment of the autoclave, at the first output which generates a signal corresponding to the value of the pressure R_aut in the autoclave, fed to the input of the pressure measurement unit R_aut. At the second outlet of the internal environment of the autoclave, a signal is generated corresponding to the value of the concentration of gas C_g in the vapor-air mixture, which is fed to the input of the unit for measuring the concentration of gas C_g in the vapor-air mixture. After that, at the second output of the evacuation dynamics controller, a signal t_v^k is generated, which is fed to the input of the pressure setting unit P₃(t), which corresponds to the end time of the evacuation stage.

EFFECT: increasing the efficiency of controlling the depth of rarefaction of the medium in the autoclave at the stage of evacuation of cellular concrete products, improving the quality and reducing the rejects of finished products, reducing energy costs for the production of cellular concrete products and stabilizing the strength of finished products.

1 cl, 3 dwg