It should be noted that some uneven heating of solid materials closed by steam registers is an organic vice of this method, as well as all methods in which there is no direct contact of the coolant with solid material. In this case, in the case of large aggregates, the uneven heating will be higher than the heating of the sand.
However, the temperature fluctuations observed in the practice of building aggregate temperatures can be significantly reduced with the correct choice of bunker configuration. The examined bunker of heating of the plant No. 5, like the vast majority of heating bunkers, is designed without taking into account the influence of the bunker shape on the nature of the expiration of aggregates from it. At the factory No. 5, the ratio of height of the bunker of heating to its linear size in the plan is 0.8. In most other bunkers operating at the Bunkers factories, this ratio is 1-1.5. The angle of inclination of the walls of the pyramidal part of the bunker to the horizontal is 40-50 °. As you know, there are two types of flooding of the mass of tanks depending on their design. When the first species expires, the part of the material that is located in the cylinder area located above the expiration hole is first mixed up. While the part of the bulk mass is located directly above the opening of the material near the walls of the bunker come in motion. Gradually, a mass of material throughout the height comes into motion, and a funnel forms on the free surface. With the further expiration of the material moving in the central part of the material, a bulk mass falls, crawling from the conical surface of the funnel.