SU708126A1 - Rotary furnace heat-exchanging arrangement - Google Patents

Description

I

The invention relates to heat exchange devices for compressing aggregates, for example, rotary kilns for heat treatment of cement raw mix.

A heat exchanger device located in the furnace body, and consisting of coaxially arranged conical drums, surrounded by smaller bases and forming a cascade heat exchange surface, is known. On the turn of the NCX: these drums are fixed cleaning carpet chains ij.

In this heat exchanger, there are no structural elements used to distribute the material over the entire heat exchange surface, which does not allow sufficiently effective use.

The most short-lasting by technical essence and the achieved result to the described device is the heat exchange device of the rotary kiln, which contains an open, placed in its boot.

; two sides of the drum, equipped with a chain curtain to the partition, connecting the outer surface of the drum with the furnace body.

The raw material slurry is fed to the inside of the furnace body and to the inside of the drum using two separate points. The drum has a length equal to 3-5 diameters of the furnace body. The diameter of the drum is O, 3-O, 6 of the diameter of the furnace body and the supply of a chain curtain {J2j.

A disadvantage of the known tenloexchange device is the low thermal efficiency due to the fact that

5, when the kiln rotates, the raw material sludge is only in the lower section of the shaft and the drum and moves in the dense layer system, and the rest of the section is free for the passage of gases, and the contact surface of the material and gas flow is insufficient.

In addition, the operation of such a heat exchanger requires

There are two separate chutes for loading the furnace and a built-in drum, which makes it difficult to maintain this loading unit, since sludge chutes require constant cleaning and repair.

The purpose of the invention is to intensify heat exchange and simplify the design,

It is achieved by the fact that in a heat-exchanging device of a rotary kiln, containing placed in its loading part, coaxially with the opening casing on both sides of the drum with a chain curtain connecting the outer surface of the drum to the furnace casing, the partitions are radial and tio the length of the furnace are offset by an angle of 15 -45 ° In addition, holes are made in the drum casing to be loaded with the drum material and to ensure the circulation of the material over the entire working section of the heat-generating device and greater contact between the material and the chain This design of the heat-transfer device creates cascade material flows in the heat exchanger and achieves a more even distribution of it across the surface of the chains, which increases the surface of the direct contact of the material with the gas flow, and makes it possible to get rid of the layered arrangement of the material in the heat exchanger.

FIG. 1 shows a general view of the heat-generating device in section; in fig. 2 is a cross section A-A in FIG. one.

In the cold part of the rotary kiln

1 and coaxially with it placed drum 2, open from both kondov. Inside the furnace body 1, the drum 2 is reinforced with flat, radially arranged partitions 3, which form two sections 4 and 5 along the length of the drum, and longitudinal chambers 6. The partitions 3 of section 5 are offset by an angle of 15-45 ° relative to the partitions 3 of section 4 in the direction rotation of the furnace body 1.

There are through-holes 7 in the body of the drum 2 for reloading material from the longitudinal chambers 6 into the drum

2i back. A chain curtain 8 with free-standing ends is installed inside the drum 2, and in the longitudinal chambers 6 there is a chain curtain 9, whose chains are located radially.

The material in the heat exchanger is fed by the chute Yu.

The proposed heat exchange device operates as follows.

According to the chute 10, the raw material slit enters the internal volume of the furnace 1 and during its rotation, it is evenly distributed along the longitudinal chambers 6, heated by a gas curtain 9 in the gas flow and partitions 3, where it is heated, and v is then through the hole 7 enters the drum 2 and distributed over the chain curtain 8, directly in contact with the gas stream.

Passing the first section 4 in the course of the material movement, the slots are reloaded from each chamber 6 of the section adjacent chambers 6 of section 5 to the heated chain curtain 9. After heating and suspending in the heat exchanger, the material freely flows into the furnace 1 and then moves to the usual chain curtain.

Claims (2)

1. A heat exchanger for a rotary kiln containing a drum with a chain-curtain placed in its charging part coaxially with the openings on both sides and partitions connecting the outer surface of the drum with the kiln's body, characterized in that, in order to intensify heat exchange and simplify the design, the partitions made radial and the length of the furnace offset by an angle of 15-45. 2. Heat exchanger according to claim 1, characterized in that holes are made in the drum housing. Sources of information taken into account during the experiment 1. USSR author's certificate number 489922, cl. F 27 B 7/16. 1973. 2. USSR author's certificate number 487282, cl. F 27 В 7/14, 1974 (prototype). 7 (Rig.y.