RU2107559C1 - Method of cleaning of small articles of oil and device for its realization - Google Patents

Abstract

FIELD: reclamation of fouled scale from secondary settling tanks of rolling water supply system at ferrous metallurgy works. SUBSTANCE: cleaning of fouled scale involves its treatment by heated degreasing reagents at continuous agitation with subsequent washing with water. Treatment is carried out by aqueous solution of water glass with a density at least of 1.1 g/cu. cm. The device for realization of the method has coaxially installed cleaning drums, coaxial cylindrical reloading drums for cleaning and washing of articles, means for conveyance of material from the cleaning drums to the reloading ones, drums rotation drive, detergent solution feed system made in the form of the lower parts of baths positioned in them. The walls of the cleaning drums are formed by louvers that overlap one another in a spaced relation by unbent edges coinciding in the direction of bending with the direction of drums rotation. Additionally installed inside the reloading drums are drums in the form of a truncated cone with a cylindrical louvered pulp separator inside it, whose smaller base faces the subsequent cleaning drum in the direction of scale movement. The means of conveyance of scale from the cleaning drums to the reloading ones represents a spiral reloader. EFFECT: enhanced efficiency. 2 cl, 2 dwg , 1 tbl

Description

 The invention relates to the cleaning of small products from oil, including scale, at the enterprises of mechanical engineering and ferrous metallurgy.

 A known method of purification of oil scale from inclusions of oils, providing for its heat treatment in rotary kilns [1,2]. During this treatment, the oils are burned out, and the scale goes into soot.

 The disadvantages of the method are: irretrievable loss of oils; the formation of toxic oils; the formation of toxic gases; scale pollution by carbon compounds.

A known method of cleaning oil scale with degreasing reagents, followed by washing with water [3]. According to the method for cleaning, a solution of the following composition is used, g / cm ³ :
Caustic soda - 0.03 - 0.050
Trisodium phosphate - 0.07 - 0.08
Liquid glass - 0.006 - 0.008
Cleaning is carried out in a rotating drum, the perforated body of which is immersed in a bath with a solution, at a solution temperature of 50 - 70 ^o C for 20 - 25 minutes

After cleaning, the drum is rearranged in a bath of water and rinsed at a water temperature of 60 - 80 ^o C for 20 to 25 minutes

 The disadvantage of the method and device for its implementation is the multicomponent composition of the degreasing solution, the use of expensive and scarce components, such as caustic soda and trisodium phosphate, the high complexity associated with loading the drums, their rearrangement and the frequency of the process.

 A known method of cleaning small products from oil, including the processing of small products from oil by heated detergent solutions with continuous stirring of products with subsequent washing [4].

 The disadvantage of this method is the insufficient cleaning of products from oil.

 A device is known for cleaning small parts from oil, comprising coaxially mounted cylindrical cleaning drums with helical grooves for cleaning and washing products, coaxial cylindrical reloading drums with additional drums in the form of a truncated cone, the smaller base of which is facing the subsequent drum equipped with turns with slots, a means of transportation from treatment drums to reloading drums, a drum movement drive, a washing solution supply system, made in the form of baths located in their lower part, with nozzles, which is taken as the closest analogue [4].

 The disadvantages of the device are: low washing efficiency due to the absence of fluid circulation in the washing zone and the formation of stagnant zones, as well as the lack of fluid movement relative to the products, since the friction forces between the products are greater than the friction forces between them and the surface of the helical groove, while the drum rotates, the product layer does not it is poured, but slips in the groove as a whole; the impossibility of cleaning finely dispersed materials, such as scale, since there is a gap in the turns of the cone of the transition zone to drain the solution, through which the scale spills back into the drum; increased consumption of treatment and flushing liquids, since the nozzles operate continuously and they are stationary, when the drum rotates at the moment of passage of the inter-turn gap, the sprayed torch leaves the drum through the inter-turn space and settles on the walls of the bathtubs.

 The problem to which the invention is directed, is to reduce the cost and increase the efficiency of cleaning small items, including oily scale.

The proposed method of cleaning small products from oil includes processing with heated detergent solutions with continuous stirring of products with subsequent washing. In this case, an aqueous solution of water glass with a density of 1.1 g / cm ³ is used as a washing solution.

 A distinctive feature of the method is that it uses a new composition of the washing solution.

 To implement the method in a device for cleaning small products from oil, containing coaxially mounted cylindrical cleaning drums for cleaning and washing products, coaxial cylindrical reloading drums with additional drums placed in them in the form of a truncated cone, the base of which is less directed towards the subsequent cleaning drum, a means of transportation from treatment drums to reloading drums, a drum rotation drive, a system for supplying detergent solutions made in the form of the bathtubs located in their lower part, the walls of the cleaning drums are formed by blinds that are bent by edges coinciding in the direction of bending with the direction of rotation of the drums, overlap each other with a gap, reloading drums are equipped with a cylindrical louvered pulp divider installed in them, and a means of transporting products from the cleaning drums in reloading made in the form of a snug reloader.

 These distinctive features make it possible to simplify and cheapen the cleaning process of small items while increasing the cleaning efficiency.

 In FIG. 1 shows the proposed device, a longitudinal section; in FIG. 2 is a section A-A in FIG.

The device is a coaxially mounted cleaning and washing 2 drums connected by a transfer drum 3 with a reverse cone 4 and a louver separator 5 of the pulp. The longitudinal axis of the drums is inclined to the horizon at an angle of 3 ^o . A gear ring 6 is mounted on the cylinder of the drum 3, connected to a rotation drive (not shown). From the side of the entrance to the drum 1 and the exit of the drum 2 there are supporting bandages 7 under the support and thrust rollers. The cylindrical walls of the drums 1 and 2 are formed of separate louvers 8, which bent edges overlap each other with a gap, and the direction of the bends of the edges coincides with the direction of rotation of the drum. From the inside, longitudinal blades are welded to the blinds 8. The unloading ends of the drums 1 and 2 are covered by snail cranes 10. The lower parts of the drums 1 and 2 are immersed in baths 11 and 12, respectively, with an aqueous solution of liquid glass and water, respectively. Walls 11 and 12 have steam shirts 13 for heating working fluids. In the upper part of the bathtubs at the level of the liquid mirror there are overflow roads 14 connected by pipelines to containers for collecting the extracted oil.

 The cleaning method is carried out in the following sequence.

Before starting work, a solution of liquid glass is poured into the bath 11 with the required density of 1.1 g / cm ³ , water is poured into the bath 12. By supplying steam to the shirts 13 of the baths 11 and 12, the working fluids are heated to 50 - 70 ^o C, after which through the filler neck of the drum 1 is a continuous supply of oily small parts or oily scale. In the process, the baths 11 and 12 are continuously fed with working fluids, heated and maintained at a given temperature. Through the neck, small items are poured into the drum 1 and, when deposited on the blinds, 8 fall under the influence of a liquid glass solution. When the drum rotates, small items are captured by the blades 9, rise and when the blade reaches an inclination angle greater than the angle of repose, it is poured into the glass solution layer. Thus, mixing of small products is achieved and the process of interaction with the working solution is intensified. In this case, liquid glass molecules wedge an oil film on the surface of small products and extract oil, which floats and forms a layer on the surface of the solution. At the same time, thanks to the louvre device on the outer surface of the drum 1, the glass solution in the drum continuously communicates with the solution in the bath 11. During rotation, the solution in the drum rises above the level of the solution in the bath and under the influence of hydrostatic pressure flows through the gap between the blinds 8 into the bath 11. C the reverse side, when the blinds 8 are immersed, the solution flows into the drum 1. This prevents oil from entering the drum again. An oil film formed on the surface of the solution flows over the overflow threshold 14 of the bath 11 and is discharged into a separator, where it is separated into oil and solution.

 With periodic lifting and dropping of small products, they are cleaned of oil and moved along the drum to the snug reloaders 10.

 Upon reaching them, the small products together with the solution are reloaded onto the louver separator 5 of the pulp. When moving along the separator 5, the solution flows through the gap between the louvres to the inverse cone 4 and is discharged back to the drum 1. Condensed sediment remaining on the separator enters the washing drum 2.

 In the washing drum 2, processes similar to those described occur, as a result, small items are cleaned of residual oil and liquid glass, dehydrated without a pulp separator and sent for further processing.

Example. A device with 250 mm diameter drums rotates at a speed of 35 rpm. The device was used to clean small items, in particular scale, with an initial oil content of 16% in an aqueous solution of water glass with a density of at least 1.1 g / cm ³ at a solution temperature of 50-70 ^o C for 20 -25 min, followed by washing with water .

 The experimental results are shown in the table.

When the density of the liquid glass solution is less than 1.1 g / cm ^{3, the} residual oil content exceeds the permissible.

The use of the invention allows to simplify and reduce the cost of cleaning, to increase the efficiency of cleaning. A degreasing solution of water glass with a density of 1.1 g / cm ³ ensures good cleaning of small parts, including scale, the residual oil content in the scale is not more than 1.5%.

Claims (2)

1. A method of cleaning small products from oil, including treating them with heated detergent solutions with continuous stirring, products with their subsequent washing, characterized in that an aqueous solution of liquid glass with a density of at least 1.1 g / cm ^{3 is} used as a washing solution.  2. A device for cleaning small products from oil, containing coaxially mounted cylindrical cleaning drums for cleaning and washing products, coaxial cylindrical reloading drums with additional drums placed in them in the form of a truncated cone, the smaller base of which faces the subsequent cleaning drum, a means of transportation from treatment drums to reloading drums, a drum rotation drive, a system for supplying detergent solutions, made in the form located in their lower part baths, characterized in that in it the walls of the cleaning drums are formed by blinds, which, with bent edges coinciding in the direction of bending with the direction of rotation of the drums, overlap each other with a gap, reloading drums are equipped with a cylindrical louver pulp divider installed in them, and a means of transporting products from the treatment reloading drums made in the form of a snug reloader.

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