SU962325A1 - Apparatus for humidifying and pelletization of granular materials - Google Patents

Description

one

The invention relates to ferrous metallurgy, in particular, to devices for wetting and mixing various dispersed materials, and can be used for the work of iron-containing raw materials, in particular for wetted, such as aspirated dust plants of sinter plants.

A device for mixing and pelletizing of bulk materials is known, made in the form of a cylindrical drum with a drive and a charging tray, whose insert BHjrrpH is fixed in the form of spherical disks 1.

The disadvantage of this device is the poor quality of mixing and pelletizing of materials.

Closest to the proposed technical essence and the achieved result is a device for wetting and pelletizing of bulk materials, containing a rotary driven drum, bandages and a movable nozzle in the cavity of the drum 12.

Disadvantages of the device - low productivity, a wide range of the resulting

material granulometric composition and low pryuchnosti granules. This is due to the fact that the material along the entire length of the drum is processed with the same nozzle, which cannot ensure the optimization of processes occurring in the drum: moistening, mixing, pelletizing, a part of the formed granules is destroyed by the movable nozzle just before unloading.

The chain of the invention is the intensification of the processes of moistening, averaging and pelletizing. Nor, increasing the strength of the granules and uniformity of the particle size distribution.

Claims (2)

The goal is achieved in that the device for moistening and pelletizing of bulk materials is provided with partitions with discharge outlets, sections, a drum with a length of three chambers, and a nozzle is placed in the first two chambers from the loading opening, and the nozzle weight dp of the first chamber is 200 -350, and for the second, 100–200 kg / m of chamber volume, and the specific surface area of the nozzle for the first 39 second chambers, respectively, is (F-8) x S- and (7-15). ten- . FIG. 1 is a diagram of the separation of a drum by partitions; in fig. 2 shows section A-A in FIG. one; in fig. 3 shows a section BB in FIG. 1. The device includes a cylindrical drum 1 divided by partitions 2 and 3 with discharge openings into separate chambers and nozzles 4 for introducing water. Chambers I and II are equipped with a movable nozzle. Metal rods in chamber I with a specific surface (4–8) -10-, in chamber II with a specific surface (7–15) are used as a nozzle. The proposed device works as follows. Dry dust is applied. In the drum chamber 1 of the pelletizer, a humidifier, in particular, technical water, is introduced by the nozzles. Dust is moistened to 6-10%. The uniformity of moisture and the absorption of moisture contributes to the volume of the nozzle weighing 200-350 kg / m chamber volume with a specific surface (4-8) 10-. In chamber I, the nozzle is not tightened by the mass of the material being moistened, it retains its mobility at almost any humidity if its specific surface is in the range (4-8) -10. This is especially important when entering water to a dry food, when local overwetting can occur. A nozzle with a specific surface of less than 4-10 is impractical to use because of the increased energy consumption for moving the nozzle in the absence of an additional effect in the uniformity of mixing. A lighter and shallow nozzle — a specific surface above 8 10 slows down the processes of wetting and mixing and makes them unstable. The weight of the nozzle is selected in the most economical and technically efficient limits. On a cage weighing more than 350 kg / m, the drum pelletizer is significantly enhanced without noticeably speeding up the wetting and mixing process. A nozzle weighing less than 200 kg / m does not affect the process of mixing and moistening the loose mass. The presence of partitions makes it possible to separate and intensify the processes of preliminary moistening and the actual granulation, taking into account that the weight and surface of the nozzle in varying degrees affect the mixing during moistening and the actual granulation of materials. Through the discharge window in the partition 2, the pre-moistened material is fed into chamber I, equipped with a movable nozzle weighing 100-200 kg / m of chamber volume and nozzles for moistening. In this chamber, the material is dehumidified to optimum moisture and granulated. The speed of the granulation process is greatly affected by the working surface of the nozzle. A nozzle with a specific surface (7–15) m / kg ensures a uniformly grained material of class 2–6 mm. As the specific surface increases above 15 -10, the yield of large granules increases. The amount of packing in chamber II (100–200 kg / m) is determined by the optimal conditions for granulating the material. When inserting a nozzle weighing less than 100 kg / m, its influence on the granularity of the material is insignificant. Entering a nozzle weighing more than 200 kg / m will granulate the granulator without additional effect. The presence in this chamber of us, of these parameters allows us to sharply intensify the production of lake matter by increasing the working surface of the pellet and the mobility of the nozzle. Through the discharge window of the partition 3, the greened material enters chamber III without a nozzle. When moving along the side wall of the pelletizer, the granules are compacted and strengthened. From this chamber, the granules are discharged and sent to the consumer. PRI me R. On a drum granulator with a diameter of 500 mm, a length of 1500 m, divided by two partitions into three equal chambers, the dust of the sintering plant BMZ is granulated. In the first chamber there is a nozzle in the form of steel rods with a diameter of 65 mm, a length of 450 mm in the amount of 3 pieces, in the second - 5 steel rods with a diameter of 30 mm, a length of 450 mm, the third is a chamber without a nozzle. In the first chamber, the supplied dust is moistened with a stream of water up to 8–10% humidity, then in a second chamber it is humidified up to 1212.5%. Performance drum 800,840 kg of wet dust per hour. The residence time of the material in the drum is about 2 minutes. Sun Sha output from the drum mixture okomkovaya. The size of granules is 2-6 mm. The mixture after the first chamber is moistened uniformly. The grain size after the second chamber is 2-6 mm. The average crushing strength of the granules is 5-6 mm after the second chamber is 0.084 kg per granule. The average grail strength after the third chamber is 0.189 kg per granule. When pelletizing aspiration dust in a drum without partitions with a nozzle of three pipes with a diameter of 90 mm, the nozzle becomes overgrown. No output granulation is observed. The economic effect due to the utilization of dust in agglomeration and the improvement of the gas permeability of the charge of the granulated charge is 200 thousand rubles. The invention The device for wetting and pelletizing of loose materials, comprising a rotary driven drum, bandages, a movable nozzle in the drum cavity, characterized in that, in order to intensify the processes of wetting, averaging, forging, increasing the strength of granules and uniformity of the particle size distribution. i it is provided with baffles with discharge openings dividing the drum along three chambers, and the nozzle is located in the first two chambers of the loading opening, the nozzle weight for the first chamber being 200-350 kg / m chamber volume, for the second 100- 200 kg / m of chamber volume, and the specific surface area of the nozzle for the first and second chambers, respectively, is (4-8). 10- and (7-15). ten- . Sources of information taken into account in the examination 1. USSR author's certificate M 578998, cl. On 01 F 9/08 ,. 1977.c 2. USSR author's certificate N 505722, cl. From 22 to 1/24, 1980. fig ra.Z