SU949304A2 - Rotary furnace heat exchanger - Google Patents

Description

(54) ROTATING FURNACE HEAT EXCHANGER

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

According to the main author. St. No. 754182 is known for a rotary kiln heat exchanger containing 5 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 shifted Q along the furnace each other around the circumference.

The raw material mixture moves due to the rotation and inclination of the furnace in the direction of the hot KqHU, a and enters the cells, in which it then moves with a rise of 15 and a pouring of 1.

A disadvantage of the known heat exchanger is the increased dust formation at the "hot (discharge)" end, which reduces efficiency, since heat is carried away along with the dust particles.

The aim of the invention is to increase the efficiency of heat exchange.

This goal is achieved by the fact that the rotary kiln heat exchanger is provided with a retaining device located between the longitudinal partitions on the side of the discharge end of the sections. In addition, the heat exchanger is equipped with screw blades mounted behind the retaining device towards the discharge end.

FIG. 1 shows a furnace at the site of installation of the heat exchanger, a longitudinal section; in fig. 2 and 3 - section A-A in FIG. 1 (partitioning options); in fig. 4 shows a section B-B in FIG. one.

Inside the furnace 1 there are partitions 2, which form longitudinal cells 3. The length of the partition 2 along the axis of the furnace 1 is determined by thermal calculation.

On the side of the “hot” discharge end of the cells 3 there is a retaining device, which can be made in the form of a ring 4.

The height of the ring 4 h is determined depending on the thickness of the layer of material (the greater the height of the layer of material, the larger the size h). The distance I from the hot end of the partitions 2 is determined depending on the inclination of the furnace 1 and the material flowability (the greater the inclination of the furnace 1 and the fluidity of the material, the greater 1). For the retaining ring 4 can be located screw blades 5. Their height is taken approximately equal to the height of the ring 4 h. The angle of inclination of the helical blades of the screw blades 5 is determined by the angle of slope of the raw mix with the material being poured from them (with the exception of lifting the material together with the blades 5 to the upper part of the furnace 1). The length 1) along the axis of the furnace 1 of the blades 5 is determined from the condition of pushing all the material out of the cells 3 (if you make 1 li, the whole material is not pushed out). Partitions 2 can be radial or parallel between themselves and the axis of the furnace 1. The heat exchanger works as follows. The raw mix due to inclination and rotation of the furnace 1 alternates in cells 3 along partitions 2 with lifting and pouring. L. go to ring 4, the raw material mixture begins to pour over the partition 2 (shown by dash-dotted lines in Fig. 1). Dumping from the partitions 2 into the gas flow does not occur, since the raw material mixture will have time to fall on the furnace body 1 (Fig. 1). if the furnace I leaves the normal mode and the thickness of the raw material mixture layer increases, part of it is poured through the ring 4, the blades 5 push the raw mixture out of the limits of burnout.

Gorchii hohei nevu

Claims (2)

d WALL 2, which excludes, in this case, the shedding of the raw mix from partitions 2. All reasoning is true for radial partitions 2, only in this case the raw mix is lifted by one partition 2, then poured into the next one, and it is pushed out of it. . The use of the proposed heat exchanger will reduce dusting, which will increase the efficiency of heat exchange by reducing heat removal from dust, and this in turn will provide fuel savings and improved furnace performance. Claims. Rotary kiln heat exchanger according to ed. St. No. 754182, characterized in that, in order to increase the efficiency of heat exchange, it is provided with a retaining device located between the longitudinal partitions on the side of the discharge end of the sections. 2. A heat exchanger according to claim 1, characterized in that it is provided with screw blades mounted behind the retaining device towards the discharge end. Sources of information taken into account during the examination 1. USSR Author's Certificate No. 754182, cl. F 27 B 7/16, 1978. / i-x) / 1-4 Fi & .2 FIG.