SU830098A2 - Rotary furnace heat exchanger - Google Patents

Description

(54) EXHAUST HEAT EXCHANGER

one

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

A rotary kiln heat exchanger is known according to the main ed. St. No. 754182, containing parallel longitudinal partitions fixed on the furnace body along its axis by means of brackets, placed evenly over the furnace cross section and made of separate sections,. displaced along the furnace relative to each other around the circumference.

The material is taken twice in each revolution by cells formed by partitions, rises into a stream of gases, then is poured (or poured in the case of sludge), which contributes to the improvement of heat transfer. In the case of installing a heat exchanger in the zone of liquid sludge, a sludge curtain is formed when it is drained from partitions, which also contributes to the improvement of heat transfer.

The disadvantage of this heat exchanger is the rapid passage of the material, which reduces its efficiency.

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

The goal is achieved by the fact that the heat exchanger of the rotary kiln according to ed. St. No. 754182 equipped with brakes fixed above partitions. blades mi. The braking blades can be made either moving, or pivoting from an external drive. The blades can be located perpendicular to the axis of the furnace, or under the ANGLE ei to the axis of the furnace, where. In addition, the blades can be attached to the furnace body by means of flexible elements, and the heat exchanger is equipped with chains hung between the partitions.

Fig; 1 shows a longitudinal section of the furnace at the installation site.

0 heat exchanger; in fig. 2 is a section A-A of FIG. 1 with swivel blades; and in fig. 3 - section A-A of FIG. 1 with blades and chains suspended on flexible elements.

Inside the furnace 1 there are partitions 2, parallel to the axis of the furnace 1 and between themselves. Their length along the axis of the furnace 1 is determined by thermal calculation taking into account the heat resistance of the material.

0 The distance between them is determined from

Conditions for avoiding seizure or glossing over with material. On the partitions 2 there are blades 3, which protrude on the surface of the partition. 2. The height of the blades 3 and the distance between them is determined by the required braking of the material, taking into account the creation of an acceptable resistance (the more Bfcnue the blade 3 and the more often they are located, the greater the braking).

The blades 3 can be movable, in particular, in the third variant they turn on axis x 4 from the drives 5. The blades 3 in the fourth variant are perpendicular to the axis of the furnace 1, and in the fifth variant they are at an angle oi. to the furnace axis (9 0 (C O S)) In the sixth version, the blades 3 are suspended on flexible elements 6, which are fixed on rods 7, passing through the drives 5. Chains 8 are hung between partitions 2 in the seventh version.

The heat exchanger works in the following way.

The material enters the cells formed by the bulkheads 2 and moves into them with pouring (or transfusion in the case of liquid sludge). The presence of blades 3 slows down the transfer of material along the axis of the furnace 1, which improves heat transfer by increasing the material residence time of heat transfer material. The execution of the blade movable (option two) gives the HTEV the ability to regulate braking. For example, turning the blade may take a position parallel to the partition 2 (option three), then braking will be minimal, and turning to 90 braking will be maximum (maximum braking is required when the material passes the heat exchanger too quickly, which can be judged by the reduction power consumed by the furnace drive).

In the fourth variant, the axes of the blades 3 are perpendicular to the axis of the furnace, and in the fifth, they are located at an angle о ° to the axis of the furnace, where. The CC angle is greater, the more braking is required (in this case, the material, the slide of the blade 3, moves downward in the direction opposite to the material).

In the sixth version of the blade 3 is suspended on the flexible elements 6 and

rotation of the furnace 1, they first lie on one partition 2, and then after the vertical transition, they lie on the adjacent one and the brake is pro, the movement of the material on one or on another partition 2.

5 The actuators 5 serve to adjust the lengths of the flexible elements 6 in such a way that the blade 3 only touches the adjacent partitions 2. Such a structure

0 reduces - the total resistance to the passage of gases. In the seventh variant between the partitions 2 chains 8 are hung, which improve the heat exchange especially in the presence of liquid sludge,

5 that sticks to them.

. The use of the proposed heat exchanger will increase the efficiency of heat exchange by reducing the rate of movement of the material. At CH6M, the rate of decrease of the speed can be adjusted depending on the mode of the furnace.

Claims (5)

Invention Formula 1. Rotary kiln heat exchanger according to ed. St. 754182, characterized in that, in order to increase the efficiency of heat exchange, it is provided with braking blades fixed above the partitions. 2. Heat exchanger according to claim 1, characterized by the fact that the blades made movable. 3. The heat exchanger on the PP. 1.2, characterized in that blades are rotatable from external drive. 0 4. The heat exchanger on the PP. 1,2,3, characterized in that blades perpendicular furnace axis. 5. The heat exchanger on the PP. 1,2,3, 5 characterized in that blades angled ct to oven axis, where. b. Heat exchanger on PP. 1,2,3, different from the fact that The blades are fixed on the furnace body by means of flexible elements. 7. The heat exchanger on the PP. 1-6, characterized in that it is provided with chains hung between partitions. Xj-x FIG. g A-A Rig. 3