SU771437A1 - Rotary furnace heat-exchanger - Google Patents

Description

one

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

There are cell, unit and other types of heat exchangers that intensify the heat exchange between the material and the hot gases 1.

The closest in technical essence and effect achieved is a rotary kiln heat exchanger containing hollow flexible elements coaxial with the furnace placed inside it, closed in an endless web.

The disadvantage of this heat exchanger is its low efficiency and short service life, since the elements quickly burn out from contact with hot gases, and the material is heated only in the lower position relative to the furnace, and the material does not rise to the upper part of the furnace.

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

This goal is achieved by the fact that the heat exchanger of the rotary kiln containing coaxial

furnace hollow flexible elements, closed in an endless canvas, equipped with fixed by means of brackets inside the furnace coaxially with it a hollow cylinder, and the hollow flexible elements freely placed on the outer surface of the cylinder. In addition, the hollow cylinder is provided with a blank wall on the side of the movement of gases. At the same time, the flexible hollow elements are provided with longitudinal ribs on the side of the furnace axis, and in one of the embodiments, the flexible elements are made of rows of chains that are interconnected.

FIG. 1 shows a longitudinal section of the furnace at the site of installation of the heat exchanger; in fig. 2 is a section A-A of FIG. 1, and in FIG. 3 is a section BB of FIG. one.

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Inside the furnace 1 on the brackets 2, 3 there are fixed hollow cylinders 4, on which flexible elements 5, which are closed in an endless canvas, are freely positioned. In the second variant, flexible elements 5 consist

20 of the links 6, which are interconnected by means of bows 7. In the third version, the links x 8 have longitudinal ribs 9. In the fourth version, around the flexible element 5 with links 8 and edges 9 are arranged in several layers flexible elements 5 with links 8a and ribs 9a. In the fifth embodiment, the flexible elements 5 are made of chains 10 interconnected by axes 11. In the sixth embodiment, the internal cavity of the hollow cylinder 4 is plugged with a partition 12. The dimensions of the brackets 2, 3 and the hollow cylinder 4 are determined by thermal calculation while ensuring that they are in contact with a layer of material. The length of the flexible elements 5 is determined from the condition of excluding their contact in the lower position between themselves and the furnace 1. The dimensions of the ribs 9, 9a along the radius are determined from the condition of elimination of crushing of the material granules, i.e. larger than the maximum granule size. The heat exchanger works as follows. When the furnace 1 is drilled, there are hollow cylinder 4 and flexible elements 5, the latter having relative movement along cylinder 4. The material trapped between cylinder 4 and flexible elements 5 in the lower position rises upward between them, which contributes to the stitching of cylinder 4 and flexible elements 5 from combustion and provides contact of the material with hot gases and in the upper position. In the second variant, flexible elements 5 are made of links 6, which increase the total heat exchange surface. In the third embodiment, the links 8 to the axis of the furnace 1 radially have longitudinal ribs 9, which lift the material upward into the gas flow. In the fourth embodiment, the flexible elements 5 are arranged in several ranks, which increases the heat exchange surface and the amount of material lifted upwards. In the fifth embodiment, the flexible elements are made of interconnected chains 10, which are more effective in the area of wet material (sludge) and I 5

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Claims (2)

11 9 Figure 1 provide samsyuchistku from adhering material. In the sixth embodiment, the internal cavity of the cylinder 4 is plugged with a partition 12 so that all gases wash the flexible elements 5 and the material that is in them. The application of the proposed heat exchanger will increase efficiency, since the presence of material between the flexible elements 5 in the upper position protects them from combustion and contributes to an increase in the degree of heating of the material. Claim 1. A rotary kiln heat exchanger containing hollow flexible elements coaxial with the furnace housed inside it, enclosed in an endless web, characterized in that, in order to increase the heat exchange efficiency, it is provided with a hollow cylinder fixed with brackets inside the kiln and flexible elements are freely placed on the outer surface of the cylinder. 2. A heat exchanger according to claim 1, characterized in that the hollow cylinder is provided with a blank wall from the side of the movement of gases. 3. Heat exchanger according to claim 1, 2, characterized in that the flexible hollow elements are provided with longitudinal ribs on the side of the furnace axis. 4. Heat exchanger according to claims 1, 2, characterized in that the flexible elements are made of a series of chains interconnected. Sources of information taken into account in the examination 1. Khodorov EI Cement industry furnaces, Stroyizdat. L., 1968, p. 59-95. 2.Certificate of Certificate No. 2664838 / 29-33, cl. F-27 V 7/16, 09/12/78. J bb Sa Su ig.Z