RU1796852C - Rotary furnace heat exchanger - Google Patents

Abstract

Usage: in industrial materials in the technique of heat transfer in rotary kilns. SUMMARY OF THE INVENTION: a heat exchanger of a rotary kiln contains a diametrical baffle and a valve pivotally fixed at its end, moreover, at a right angle to the valve on the hollow axis, a floor baffle with cut ends and a cutout on one half of the width is fixed, and along the inner circumference of the furnace together with the valve spherical threshold. The heat exchanger may include a partition with one edge slanted along the entire length. 2 ill.

Description

The invention relates to a heat transfer technique in rotary kilns and can be used in industrial materials.

A rotary kiln cell heat exchanger with beveled edges at the ends is known.

. The closest in technical essence and the achieved results to the described is a rotary kiln heat exchanger containing diameter. ral septum and valves pivotally mounted at its ends,

In such a heat exchanger, when the hinge axis is upright, the valve moves smoothly from one extreme position to another under the influence of weight, opening the cell above it for passage of gases and closing the cell under the valve for gas passage, and the material is discharged from the partition through the valve without dust.

The disadvantages of the known heat exchanger are low heat transfer efficiency due to the absence of contact of hot gases with the material in the closed cell, high hydraulic resistance to the passage of hot gases due to the reduction of the cross-section, low efficiency due to combustion and warping of valves, which have large dimensions and poorly cooled material. The aim of the invention is to increase the efficiency of heat transfer.

The heat exchanger of a rotary kiln contains a diametrical baffle and valves pivotally mounted at its ends, they are shortened parallel to the ends of the baffle plate, and additional baffles are cut at right angles to them, cut to the outside in size on one side of the valve, with a diameter approximately equal to the inside diameter of the furnace, and with another by the size of the material layer in the furnace, and on the furnace in the vicinity of the valve there is a threshold with a configuration along a sphere with a diameter approximately equal to the internal diameter of the furnace, taking into account the weight liver free, turning the valve with an additional septum. Additional partitions can be sloped straight

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lines with a decrease in size from the cut in diameter.

In such a heat exchanger with a sharp decrease in hydraulic resistance from. a shortened valve improves heat transfer in both cells ..

Fig. 1 shows a heat exchanger, an axial section perpendicular to the diametrical partition in Fig. 2 - the same, along the diametrical partition.

Inside the rotary kiln 1 with lining 2 of diameter P there is a diametrical partition 3, at the ends of which hollow valves 5 of size he are installed with additional hollow partitions of 6 widths at hollow axles 4 exiting the furnace. 2 m, which are cut at half width on one side, straight at a time: measure C, equal to the thickness of the material layer, and on the other, approximately equal to the diameter D, taking into account freedom of rotation at size M. The edges 7 of the partitions 6 can be beveled along a straight line with a decrease in size from the cut in diameter D. In the additional region, with a partition b inside the furnace 1 with lining 2, a spherical threshold 8. is installed, which is smaller in diameter than diameter D by an amount that allows the partitions 6 to freely rotate, and is equal to t in length Axis 4 is set in under ipnikah 9 with seals 10. The size of the partition 3 is determined by the length of the thermal calculation, taking into account the heat resistance of its material (the greater the heat resistance of the material, the longer possible to do without the danger perego- rodku its rapid combustion).

The size of the L valves B is taken to be minimal and is determined constructively from the angle of rotation of the partition 6 from one extreme position parallel to the partition 3 to another and depends on the thickness of the partition 3.:; ,.

The size m and the bevel angle of the edges 7 are taken from the condition of excluding sprinkling of material

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Formula 1 of the shade 1, A heat exchanger of a rotary kiln, comprising a diametrical baffle and a valve hinged at its end, characterized in that, in order to increase heat exchange efficiency, a floor baffle is fixed at a right angle to the valve on the hollow axis with the cutoff of the partition 6 when it is rotated together with the furnace 1. The diameter of the hollow axis 4 is determined by calculating from the condition of providing a given degree of cooling of the valve 5 and the partition using air or other cooling agent and is checked for strength from the influence of weight Container material.

The remaining dimensions are determined structurally and checked for strength and performance. -.

The heat exchanger operates as follows. With the position of the partition b shown in Fig., The material is on the partition 3 and the mountains - well warms up. gases, then the same thing happens with the material under the partition 3, which lies on the lining 2. With further rotation, the material begins to pour over the partition 3 with movement along the axis of the furnace due to its bias towards the discharge, but does not allow it to flow into the gas stream the partition 6, which protrudes relative to the axis 4 by a value of m, and from the side of the lining 2 the threshold 8 interferes with pouring.

With further rotation, the axis 4 takes up a vertical position and then, under the influence of the weight of the valve 5 with the partition 6, the valve 6 smoothly turns from one extreme position to another and instead of one edge 7, another edge 7 emerges under the influence of hot gases and the process is repeated. The cooling of the cavities of the axis 4, valve B and partition b provides greater efficiency,

The use of a heat exchanger reduces hydraulic resistance, which reduces the cost of electricity for gas leakage. The passage of gases on both sides of the valve 5 increases the efficiency of heat transfer, which leads to fuel economy. Alternating contact of one edge 7, then the other with hot gases increases the work ability, which reduces the cost of repair and increases the output of products.

ends and with a cutout on one half of the width, and a spherical threshold is made along the inner circumference of the furnace at the valve location ..

2, The heat exchanger according to claim 1, with the exception that one edge of the partition is beveled along the entire length.

Editor

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Compiled by O. Samokhina Tehred M. Morgenthal

Proofreader M. Kul