Five ways to solve the sticking phenomenon of spray drying machine

There are many classifications of spray dryer According to gas liquid flow, they can be divided into parallel flow, counterflow and mixed flow According to the installation of nebulizer, they can be divided into upper and lower ones According to the structure of nebulizer, they can be divided into centrifugal, pressure and airflow According to whether the heating gas can be recycled, it can be divided into open, partial and closed Sticking phenomenon is a serious problem that hinders the normal operation of spray dryer The spray drying process of solid preparations (especially Chinese Medicine) is particularly obvious Material sticking to the wall is not only not conducive to the collection operation, but also with the extension of time, sensitive sticking materials will deteriorate into unqualified materials From the point of view of technology, the solutions include choosing suitable solvents, adding auxiliary materials and changing process parameters However, there is not much room for these methods to be adjusted Therefore, it is necessary to seek fundamental solutions from the perspective of equipment Experts at home and abroad have studied the problems of wall sticking and caking in the drying process, and they think that the main reason of wall sticking is the wall temperature The spray drying machine adheres the wall generally in three situations: 1 Semi wet material adheres the wall: the reason is that the droplets sprayed out have contacted with the wall before reaching the surface dry, and therefore stick to the wall The position of the sticky wall is generally on the plane of the droplet trajectory on the atomizer, and the structure of the atomizer, the hot wind is related to the movement state of the tower 2 Hot melt wall adhesion of low melting point materials: the reason is that the materials begin to melt at a certain temperature and become sticky and adhere to the wall 3 Surface adhesion of dry powder: the movement of dry powder in a limited space will always touch the wall of the device, which can not be avoided, but such adhesion is generally not thick, as long as it can be shaken down by air blowing or tapping gently, the simple solution is to polish the inner wall, which can solve the problem to a certain extent There are five ways to solve the problem of sticky wall in the spray drying machine: 1, the wall drying tower is used to cool the air between 50 degrees below 2; 2, the air cooling tower wall is cut through the tangential air of the tower wall; 3, the air broom which is composed of a row of nozzles near the wall of the tower is slowly rotated along the wall of the tower 4 Increase the air hammer on the tower wall, and force the wall sticking materials to separate through the impact of the air hammer; 5 Increase the processing accuracy of the equipment, and polish the inner wall of the tower can also reduce the wall sticking