SU953407A1 - Rotary kiln cellular heat exchanger - Google Patents

Description

one

This invention relates to a heat exchange technique in rotary kilns and can be used in the building materials industry.

A rotary kiln cell heat exchanger is known that contains cells parallel to the furnace axis formed by the internal partitions arranged along the furnace axis, are turned one relative to another and are screw elements mounted on the Q discharge ends of the cells, also formed in the form of cells and connecting adjacent cells 1.

In such a heat exchanger, in any position of the furnace, there are portions of the material that are in the upper position, and they are brought into contact with hotter gases. In this case, the furnace drive is not overloaded, since the material is evenly distributed over the cross section of the furnace. 20

A disadvantage of the known heat exchanger is the large hydraulic resistance, which is created by screw

cells that occupy the entire cross section of the furnace, and which are very difficult to implement.

The purpose of the invention is to reduce the hydraulic resistance and simplify the design.

This goal is achieved by the fact that in a cell heat exchanger of a rotary kiln containing sections of cells parallel to the axis of the kilns placed along the axis of the furnace with internal partitions, rotated one relative to another, and screw elements mounted on the discharge ends of the cells, the sections of the cells are in alignment with each other the partitions are made with cuts at the discharge ends, in which are placed spiral elements made in the form of trays.

In such a heat exchanger, the central part of the furnace does not overlap with helical-shaped cells, which reduces the resistance to the passage of gases. FIG. Figure 1 shows a furnace with two pilot valves and one and with 90 sec. Cells, rotated 90 degrees, the longitudinal raere in FIG. 2 shows section A-A in FIG. 1 with radial partitions; in fig. 3 - section BB in FIG. 1 with radial partitions in FIG. 4 shows section A-A in FIG. 1 with parallel axes of the furnace partitions; in fig. 5 is a section BB in FIG. 1 with parallel axes of the kiln. Inside the furnace 1, there are sections of partitions 2, which form the cells a, b, C, d, e, -, g, b. if the partitions 2 are radial or a, t); c, if the partitions 2 are parallel to each other and the axis of the furnace 1. The number of partitions 2, their length along the axis of the furnace 1 and the number of sections are determined by thermal calculation. On the side of the discharge end of the partitions 2, cuts are made with pa3Mepajv along the axis of the furnace 1 equal to b. This size is determined by the fluidity of the material, taking into account the distance between the respective partitions 2 of the adjacent sections (the greater the fluidity of the material, the smaller the size; the greater the distance between the corresponding partitions 2, the larger the size 6). The size Wi in the direction perpendicular to the axis is determined by 5-10%, depending on the thickness of the material layer and more than this thickness. In the cutouts are screw trays 3. The heat exchanger works as follows. Due to the rotation and inclination of the furnace 1, the material moves towards the hot end of the furnace 1, enters the cell sections a, b, c, d, e, {o, v, c d moves into them with lifting and pouring. After reaching the cuts in the partitions 2j, it is poured over the internal surfaces of the screw chutes 3 onto the partitions 074 2 following the course of the section and continues to move further. The material that has not yet reached the Cutout in the partition 2 moves along it, as indicated by the arrows, and reaches the cutout in this partition at the other end and then drops along the outer surfaces of the trays 3 onto the furnace body 1. The use of the proposed heat mixer reduces hydraulic resistance to the passage of gases, since the screw trays 3 overlap the cross section of the furnace 1 only by the size of the ring with height tn This will lead to energy savings for the drive of the exhauster to suck the gases through the furnace 1. In addition, the design screws Tray 3 is easier to vsholneshsh than screw cell. This means that this will lead to savings in labor costs for manufacturing and repairs. The formula of the invention. The cell heat exchanger of the rotary kiln containing cells formed along the furnace axis by internal partitions of sections parallel to the furnace axis of the cells rotated one relative to another, and screw elements mounted on the discharge ends of the cells, characterized in that, in order to reduce flow resistance and simplify the design, cell sections are located close to each other, and partitions are made with cuts at the discharge ends, in which the screw-like elements are placed, filled in the form of trays. Sources of information taken into account during the examination 1. USSR author's certificate P27 B 7/16, 1979 No. 807О13, cl. (prototype).

Claims (1)

Claim Cellular heat exchanger of a rotary kiln, contents formed by the internal partitions of the section along the furnace axis of the section of cells parallel to the furnace axis, rotated one relative to another, and screw-shaped elements mounted on the unloading ends of the cells, characterized in that, in order to reduce hydraulic resistance and simplify the design, the cell sections are located close to each other, and the partitions are made with cutouts at the discharge ends, in which there are screw-shaped elements made in the form of trays.