SU850196A1 - Apparatus for granulating melt - Google Patents

Description

(54) DEVICE FOR GRANULATION OF THE MELT

Claims (5)

The invention relates to the instrumentation design of the process of melt granulation and can be used in the chemical, metal, construction and other industrial sectors. A device for granulating a melt of calcium carbide is known, which contains a hollow drum with a charging end for introducing a melt and a discharging end. The drum is installed under a certain incline in the direction of movement of the material and rotates at a constant speed. The outer surface of the drum is irrigated with an agent (water). On a part of the inner surface of the drum, the plates are reinforced, which ensure the crushing of the hardened product. The discharge end of the drum passes into the discharge chamber 1. The melt entering the loading end of the drum crystallizes and forms ingots and agglomerates of different particle size distribution. Ingots and agglomerates are fractionated to the required smaller sizes due to subsection a periodic fall from a certain level to which they are lifted from the plate, fixed on the inner surface of the drum during the rotation of the bar. When crushed, due to the lack of selectivity, a considerable amount of fines and dust are formed in the process. In the known device, sifting of the crushed product by fractions is also absent. The product moves with a total poorly divided mass, which results in a low drum filling coefficient and poor organization of heat removal. Because of this, the performance of the device in question is low and the product is not sufficiently cooled, the tether temperature at the outlet of the discharge chamber often exceeds 300 C. Thus, the device in question has low productivity and does not ensure the quality of the product does not provide the required product cooling. The purpose of the inventions is to increase the productivity of the device by reducing the yield of small substandard fractions of the product and the formation of dust, improving heat exchange conditions that provide the required cooling of the product. This goal is achieved by the fact that the inner surface of the drum plate is set at an angle to the drum's core, exceeding the friction angle of the product-metal slip. The pitch between the plates is reduced in the direction from the loading end to the discharge end of the drum. In this case, the plates have different lengths. The drum is also provided with longitudinal partitions. At the discharge end of the drum, a screen is placed for sieving the product with openings whose diameter increases in the direction from the loading to the discharge end of the drum. FIG. 1 shows the inventive melt pelletizing device, a general view of / in FIG. 2 is a cut AA in FIG. IJ in FIG. 3 - section -B in FIG. one; in fig. 4 shows a section B-B in FIG. one; in fig. 5 is a section of YYD in FIG. 1. The device consists of a rotating drum 1. with a charging end 2 for introducing the melt and a discharge end 3. Plates 4-6 are installed on the inner surface of the drum at an angle to the drum's core that exceeds the friction angle of the product slip on the metal, the pitch between the plates 4 is set in the calculation of the crushing of large ingots and agglomerates. Plates 5 have a step of the maximum size of the fraction of the finished product. Plates 6 are installed among the plates 5 (Fig. 3 projecting in the radial direction for additional cracking of the non-conforming product. Longitudinal partitions 7 are located between the section with the plates 5 and the discharge end 3, forming sections (Fig. 4) to divide the product into a series of streams. At the loading end of the drum there is a screen 8 with holes For sifting the finished product by fractional composition, the diameter of the holes increases in the direction from the loading to the unloading end of the drum. Plates 9 (Fig. 5) for dodes are installed in the screen from the rumble of the finished product jiocTynaeT into the unloading chamber 10 having a damper 11c with a load 12 and paraplate 13 for suctioning the gas-air mixture.The device contains: a means for supplying a cooling agent — water 14. The device operates as follows. the drum 1 and the loading end 2 crystallize, solidifies and the solidified pieces enter areas equipped with plates 4-6, are selectively crushed and the product flow is divided by a longitudinal partition 7 into a series of flows and enters the The formations formed by these and partitions are cooled further to the screen 8, where the product’s fractional composition is carried out. Larger chunks, flow into the screen, are tightened by plates 9. From the screen, each fraction of the finished product enters the discharge chamber 10, through which gases generated during the crystallization of the melt are sucked off and discharged by the nozzle 13. To avoid air leaks in the discharge chamber, a valve 11 is installed 12. Placing the plates at an angle exceeding the friction sliding angle ensures that the crushed to the required dimensions of the product is removed from the crushing zone, which eliminates excessive grinding of the product and significantly reduces the formation of fines and dust. Reducing the pitch between the plates in the direction from the loading end to the unloading end of the drum and the presence of plates of different lengths provides the necessary sequence of the crushing process, determines the final size of the crushed product. The longitudinal partitions divide the drum into separate sections, thereby dividing the product flow into a number of separate streams, which entails an increase in the contact surface between the product and the drum working surfaces, and also reduces the thermal capacity of the product streams, increases the active surface. layer, i.e. contributes to the intensification of the cooling of the product. Placing in the discharge end of the drum screen having holes, the diameter of which increases in the direction from the loading end to the discharge end of the drum, determines the possibility of fractional sieving of the product, separating primarily fines and dust from the main product flow, which contributes to additional cooling of large fractions of the product, those. the porosity of the product layer increases. The use of the proposed device for melt pelletizing allows increasing the productivity by 1.5-2 times due to the reduction of dust and fines in the final product and more intensive cooling of the product during the granulation process. Claims 1. A device for granulating a melt, comprising a rotating drum, provided at opposite ends with a tray for introducing the melt and unloading with a chamber, means for supplying a cooling agent, plates fixed on the inner surface of the drum, preferably. that, in order to increase productivity, the plates are set at an angle to the shape of the drum, exceeding the friction angle of the product slip on the metal. 2. A device according to claim 1, characterized in that the pitch between the plates is reduced in the direction from the loading end to the discharge end of the drum. 3. The device according to paragraphs. 1 or 2, characterized in that the plates have different lengths. 4. Device on PP. 1,2 or 3 / characterized in that the ba f . -.-- LI 5-B. 8-3 Gd (rig. 3 raban is supplied with longitudinal partitions. 5. The device according to claim 1-4, which is based on the fact that at the discharge end of the drum there is a screen having openings whose diameter increases in the direction from the loading point to the discharge end of the drum. Information sources, taken into account in the examination Production 1. Kuznetsov L.A. Calcium carbide, M., 1954, p. . FSh4 II