SU830100A1 - Rotary furnace heat exchange apparatus - Google Patents

Description

one

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

Cell, chain, chain and other types of heat exchangers are known, which serve to improve the heat exchange between the hot gases and the raw mix 1.

The closest in technical essence and the achieved result to the described invention is a heat-exchange device of a rotary kiln containing hollow closed elements freely located in each other.

When in the upper position, the hollow elements are heated by hot gases, and in the lower position they enter the layer of material, giving it heat 2.

A disadvantage of the known heat exchangers is its low efficiency, since the surface of the elements is small, the gases do not wash the surfaces of the hollow elements well enough, especially in the places of their contact and near them. The granules are strongly destroyed at the points of contact of hollow elements, which leads to increased dust formation and heat loss along with dust.

The purpose of the invention is to increase the efficiency of heat transfer.

This goal is achieved by the fact that in a known heat exchanger of a rotary kiln, containing freely. hollow closed elements arranged in each other, the latter being made of rods wound along a helical line, the contacting elements being made with the opposite direction of the turns.

0

In this case, the hollow closed elements are suspended on the axes fixed on the internal surface of the furnace with the help of flexible elements or freely located inside the furnace with restriction of movement 5 along its axis.

Claims (2)

In such a heat exchange device, with the same dimensions of the hollow elements, the heat exchange surface is larger, moreover, when in the upper position, gases freely penetrate the elements, since the turns of the contacting elements have the opposite direction and therefore there is only a point contact between them. . For the same reason, in the lower position, the granules practically do not break, so the elements are well heated at the top, and the material is good at the bottom that gives off heat to the material without destroying the granules. FIG. 1 shows a furnace, longitudinal section, at the site of installation of heat exchange elements suspended on axes fixed on the inner surface of the furnace; in fig. 2 - the same, with heat exchange elements freely located inside it, longitudinal section; in fig. 3- section A-A in FIG. one; in fig. 4 is a section BB in FIG. 2; in fig. 5 - a separate element, a general view. Inside the furnace 1 on the axis x 2, fixed with the help of flexible elements 3 on the furnace 1, hollow cylindrical elements 4-6 are freely installed one inside the other. Each cylindrical hollow element 4-6 is made of rod 7, for example, of circular cross section, but the section of rod 7 may have a different shape. The matching elements 4-6 have the opposite direction of the coils, which ensures their free movement without jamming. The hollow elements 4-6 are placed in the free space between the confined furnace 1, the axial movement 8 of the floor element 9. Between the turns 7 of the elements 4, 5 and 9 for rigidity, the elements 10 of the same rod 7 are evenly set around the circumference. The turns on each element 4, 5, 6 and 9 can be single and multiple. The lengths of the elements 4, 5, 6 and 9 are determined by thermal calculation. The diameter of each inner element 4-6 is 0.95-0.5 of the diameter of the outer one and is also determined by thermal calculation. The transverse dimensions of the rod 7 are determined by the required surface, taking into account the required heat capacity (the larger the cross-sectional dimensions of the rod 7, the greater the heat capacity), as well as from the condition of ensuring the rigidity of the elements 4, 5, 6 and 9. Step 1 between helix turns is determined from the condition of elimination of material smearing (the larger the granules and the more sticky the material, the greater the step t). The number of elements (one in the other) 4, 5, 6 and 9 is determined depending on the transverse dimensions of the rods 7 and the thickness of the material layer h, ensuring that the turns of the inner element 4-6 are immersed in the material. The heat exchanger operates as follows. When the coils of the elements 4, 5, 6 and 9 pass through in the upper position, they are penetrated by hot gases and are well heated. In the lower position, they enter the layer of material that passes well through all the elements 4, 5, 6 and 9, while the granules do not break down, because the contact between the elements 4, 5, 6 and 9 is a point. And the coating of the elements 4-6 also does not occur, since, rolling over in each other, the elements 4, 5, 6 and 9 self-clean. Since the direction of the turns of the adjacent elements 4, 5, 6 and 9 is opposite, they do not jam in each other and enter the material well without destroying its granules. The application of the proposed heat exchanging device increases the efficiency of heat exchange, the surface of the elements 4, 5, 6 and 9 is larger than that of the known heat exchangers with the same dimensions. Gases well wash all the coils of elements 4, 5, 6 and 9 due to guaranteed gaps between them, the destruction of the granules does not occur due to the point contact between elements 4, 5, 6 and 9. Invention 1. A rotary kiln heat exchange device containing hollow closed cells, which are freely located in each other, are characterized in that, in order to increase the efficiency of heat exchange, the hollow closed elements are made of rods wound along a helical line, the contacting elements being made with the opposite direction of turns. 2. A device according to claim 1, characterized in that the hollow closed elements are suspended on axes fixed on the inner surface of the furnace by means of flexible elements. 3. A device according to claim 1, characterized in that the hollow closed elements are freely located inside the furnace with restriction of movement along its axis. Sources of information taken into account in the examination 1. Khodorov EI Cement industry kilns. L., Stroyizdat, 1968, p. 59-9a - 2. USSR author's certificate in application number 2684772 / 29-33, cl. F 27 В 7/16, 1978. Z. rz-zia-f I. J-- 6 ) (oS zajoS Move fiamepua / jg. Cold KOHet4 furnace ZD one  i / I i  five .Higher end fr- ff ovens 3 fui. 2 eight