SU1762091A1 - Heat exchanger of rotating furnace - Google Patents

Abstract

This invention relates to a heat exchange technique in rotary kilns and can be used in industrial construction materials. The purpose of the invention is to increase the efficiency of heat transfer and reduce the metal intensity of elements. The rotary kiln heat exchanger contains hinged hollow closed tubular elements that are cut on both sides at an angle equal to the angle of repose of the material being processed. 2 Il.

Description

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

A heat exchanger with hinged trough-shaped blades is known.

The closest in technical essence and achievable results to the described one is a heat exchanger containing hollow closed tubular elements fixed on brackets with axles.

In such a heat exchanger, in the upper position, the elements with the material sag and are heated by the material, the lower part enters its layer, then slip relative to the axes along the furnace body and the process repeats.

The disadvantages of it are

-the replacement of the material inside the element is bad, which reduces the efficiency of its heating;

-low performance due to wear of the element and the furnace during slippage;

-high intensity.

The aim of the invention is to increase the efficiency of heat exchange and reduce the metal intensity of the elements.

FIG. Figure 1 shows a longitudinal section of a rotary kiln with a heat exchanger; in fig. 2 shows section A-A in FIG. one.

Inside the rotary kiln 1, brackets 2 with axes 3 are hinged with hollow closed tubular elements 4, which at both ends have sections at angles equal to the angle of repose of the raw mixture being processed, which, for example, is 409 ° for cement The calculation is based on the condition that a given amount of the raw mix is raised, taking into account the heat resistance of the material and the temperature of the gases (the more heat resistance and the lower the gas temperature, the larger the size can be taken). The number of elements 4 along the circumference in one section is taken as high as possible while ensuring the condition of excluding mutual touch. Part of the element 4 on the side of the furnace body 1, when lifting the material, may be opposed to the reduction of dusting (shown in Fig. 1 by the dotted line). Ossl

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Total dimensions are determined constructively and tested for durability and operability.

The heat exchanger works as follows.

When entering the lower position into the layer of material from the elements 4, the material freely spills out, which is facilitated by a narrower part on the side of the CS3. With further rotation, the elements 4 slowly turn over on axis 3 in the layer of raw material bunches and fill with a new one. Upon exiting the layer, a material remains in the layer, which is heated by hot gases, at the same time protecting the elements 4 from burning.

The use of a heat exchanger will increase the efficiency of heat exchange, since the material in the elements 4 will be better replaced, and this will lead to fuel savings. The presence of an oblique cut on the elements 4 provides improved performance at high temperatures, because there are no parts of the element that does not touch with raw mix, which increases reliability and reduces repair costs. At the same time, the presence of oblique cuts reduces the metal intensity of elements 4 with the same amount of material being lifted, which will reduce the cost.

FORUMAWLAH AND ISLANDS

Rotary kiln heat exchanger containing hollow closed tubular members hinged on brackets with axles, characterized by

so that, in order to increase the efficiency of the heat exchange process and reduce metal consumption, the elements on both sides are cut at an angle equal to the angle of repose of the material being processed.

Claims (1)

The claims of a rotary kiln heat exchanger containing hollow closed tubular elements pivotally mounted on brackets with axles, characterized in that, in order to increase the efficiency of the heat exchange process and reduce metal consumption, the elements on both sides are cut off at an angle equal to the angle of natural deflection FIG. 2