SU673823A1 - Screen bar refrigerator - Google Patents

Description

(54) KOLOSNIKOVY FRIDGE

one

The invention can be used in the cement industry.

The calcined material, in particular cement clinker, leaves the kiln with a temperature of 1150–1300 ° C and, when cooled in a refrigerator, emits a large amount of heat, which heats the air supplied to the kiln to intensify the combustion. In order to use the heat radiated by clinker during cooling, heat exchangers installed on the inner walls of the body or in refrigerators 1 are known.

Heat exchange tubes are located in hard-to-reach places, which makes it difficult to remove heat.

The protection of the heat exchange tubular device is provided by the coating of the solidified molten charge.

The temperature of the water passing through the heat exchange tubes is 30-50 ° C.

It is not possible to use the said device for heat recovery in clinker coolers, as the heat insulating material protects them by protecting the heat insulating material, and the open tubes in the high temperature zone are subjected to temperature effects, which leads to their deformation and destruction.

The closest to the invention in technical essence and the achieved result is a refrigerator with a heat exchange device in the form of pipes with ribbed protruding elements that are simultaneously reflective and guiding shields 2. The heat exchange device is installed on the roof and walls of the refrigerator chamber above the grate.

The location of the heat exchanger in the grate cooler in the low-temperature zone practically reduces the temperature of the secondary air entering the furnace from the refrigerator.

Due to the location of the heat exchange tubes in places prone to intense dusting, heat removal is drastically reduced.

The tubular form of the heat exchanger is applicable for the heating of water and air. The use of this device for heating bulk materials is impractical, since compressed air is required for transporting bulk materials through pipes, the presence of which in the material requires additional heat to heat it.

The purpose of the invention is to intensify the utilization of heat emitted from the burned clinker to dry the bulk material.

The goal is achieved by the fact that in the grate cooler comprising a body with a grate located in it and with a heat exchanging device placed above it, the latter is made in the form of a conveyor equipped with scrapers.

The location of the conveyor inside the refrigerator above the hot clinker layer allows maximum use of the radiant heat of the clinker and the heat of the air heated by convective heat exchange, eliminating the possibility of the material being dried on the clinker layer, which makes it possible to avoid clinker contamination by undesirable impurities. In addition, the conveyor located in the refrigerator is at the same time a reflective surface, contributing to the sedimentation of small particles of clinker flying out along with the air flow, which is a valuable finished product.

FIG. 1 shows the proposed grate cooler, longitudinal section; in fig. 2 - section A-A of FIG. I.

The grate cooler consists of a chamber 1, horizontally divided into two parts by a grate 2, which consists of moving and stationary rows of grates attached to longitudinal under-rim beams. In the upper chamber of the refrigerator lined with refractory bricks, a tenloexchange device is installed above the grate 2 - a scraper conveyor 3 above which the loading chute 4 with a sealing device 5 is located. In the lower chamber of the refrigerator there is a discharge chute 6 with a sealing device 7 and a conveyor 8 for dry material .

The device works as follows.

The clinker burned in a rotary kiln with a temperature of 1200-1300 ° C falls

on the slope of the material in the shaft of the refrigerator, rolls down from it and goes to the grate 2. At the same time, wet material is fed through the loading chute 4 to the heat exchanging device - scraper conveyor 3. Hot grate 2 moves through the grate 2, which is blown by air that is fed under the grate 2. The conveyor is heated and the material is dried by the radiant heat of the clinker and the air heated

when passing through a layer of hot clinker during its cooling. When moving along a scraper conveyor to improve heat transfer, the material is mixed with scrapers. The dried material is discharged through the chute 6 onto the conveyor 8 and is fed for further use.

The invention allows the use of waste heat from air heated during clinker cooling to moisten waste 1

air, which contributes to its better purification in electrostatic precipitators, to reduce the total amount of air for cooling the clinker and the number of drying units installed for drying the material, i.e., to reduce the amount of fuel consumed per unit of products manufactured by the plant.

Claims (2)

1. A knee cooler, comprising a housing with a grate located therein and with a heat exchanger placed above it, characterized in that, in order to intensify heat recovery for drying loose material, the heat exchanger is designed as a conveyor. 2. The refrigerator according to claim 1, wherein the conveyor is provided with scrapers. o Sources of information taken into account in the examination 1. US Patent No. 3034776, cl. 263 33, 1967. 2. The patent of Germany No. 1220779, cl. 31 a7 / 38, 1967. uuuuiJu yiiuuuiJl) ij u and L- / 1 2.2