RU2253516C2 - Device for rotary fan-like annular liquid jet forming - Google Patents

Abstract

FIELD: nozzles, particularly for cleaning reservoir bottom from residual viscous, high-viscous and hardening liquids and for removing deposits near connection pipes of fire-extinguishing systems adapted for extinguishing fire in reservoirs.

SUBSTANCE: device bottom is provided with radial eccentrically located distributors formed as plates having chamfers on the first plate sides. Plate length is less than device bottom radius. Plate height exceeds width of gap defined by device body and bottom.

EFFECT: increased efficiency along with maintaining design effective volume of the reservoir, reduced reservoir damage due to corrosive action.

2 dwg

Description

The invention relates to a device for cleaning the bottom of tanks from sediments of viscous, highly viscous and highly solidifying liquids, mainly of petroleum origin and can be used in the oil and oil refining industries.

During the operation of tanks, a large amount of viscous, highly viscous or highly solidifying sediments are deposited on their bottom, which reduce the useful volume and complicate normal operation. Removing precipitation is a complex and time-consuming operation. As indicated in [1], effective methods to combat the accumulation of sediment in reservoirs have not yet been created. The tank bottom cleaning devices used are based on the hydrodynamic and physico-chemical effects of the jets of various washing machines RAM-1, MM-3, GMOS-2, GM and require the use of manual labor. The softened suspended sludge is removed from the tank by cleaning pumps. Cleaning the bottom of large tanks with known devices requires the use of several washing machines and a significant number of people for maintenance. So, in [1] it is indicated that 6 people are required to clean the bottom of the tank with a capacity of 5000 m ³ . In the absence of washing machines, the tank is cleaned manually with a shovel.

A device is known for cleaning containers from bottom sediments [2], in which a cylindrical body with a flange mounted with a gap above the bottom, equipped with a movable casing shell mounted outside the body and having bent lower edges is used to form a fan ring jet of liquid. The device is installed on the bottom of the tank (tank) and connected to the pressure pipe. In the absence of fluid supply to the pressure pipe, the movable shell drops to the bottom of the device, separating the internal cavities of the device and the tank.

The disadvantage is the known design of the device does not allow to effectively erode bottom sediments in the tank in the form of asphalt-resin-paraffin deposits (AFS), because a viscous or highly viscous sediment located in the vessel prevents the lifting of the mobile loaded shell, i.e. the formation of a gap between the movable shell and the bottom of the device [3]. In addition, in an inoperative state, a viscous or highly viscous precipitate is accumulated in the internal cavity of the device during the inter-cycle period of cleaning the bottom of the tank, which also prevents the lifting of a loaded, loaded shell, i.e. the formation of a gap between the movable shell and the bottom.

The purpose of the invention is to increase the efficiency of the device by forming a rotating fan ring jet of washout liquid to maintain the useful volume of the tank, as well as eliminating the design of the movable loaded shell to eliminate obstacles to the formation of a gap and the expiration of the rotating fan ring jet of liquid as a result of exposure to the shell of a viscous, highly viscous or highly solidifying sediment.

This goal is achieved by the fact that the bottom of the proposed device is equipped with radial eccentrically arranged dividers made in the form of plates with a bevel on one side, while the length of each plate is less than the radius of the bottom of the device on which it is mounted, the height of the plates exceeds a fixed amount of clearance between the body and the bottom of the device , and the flow rate of the erosion fluid is set and maintained by the pump pumping it.

Upon erosion of a highly solidifying sediment, a washing liquid heated to the required temperature is supplied to the device.

Figure 1 shows a General view of the device; figure 2 is a section I-I in figure 1.

The device comprises a bottom 1, a gap 2, formed by the bottom of the device and the housing 3 with a flange and bent lower edges, dividers 4 and a cone 5.

The device operates as follows:

After turning on the pump and starting the supply of erosion fluid to the device for erosion of bottom sediments around each device, an intensive rotational movement of the entire mass of fluid flowing out through a fixed gap 2 formed by the bottom 1 of the device and the bent lower edges of the body 3 of the device is established. The rotational movement of the fan fluid flow and its continuity at the exit of the gap 2 is provided by the cone 5 and the dividers 4, made with a bevel on one side and having a length less than the radius of the bottom of the device.

In the process of testing, the following was established.

The average speed creating a rotational motion of the erosion fluid at the exit of the gap allowed us to conclude that the use of the proposed device increases the effect of erosion and weighing in the volume of the erosion fluid sediment paraffin, because its value of 9.9 m / s significantly exceeds the critical velocity of sediment sediment weighing with a fan stream (0.2 m / s).

The location of the flow divider device at an angle of 90 ° is optimal for creating a rotational movement.

The use of the present invention will constantly maintain the capacity of the tanks at the design level, reduce the intensity of corrosion damage to the bottom of the morning of the lower belt of steel tanks, and can also be used for erosion of bottom sediments at the locations of the outlet pipes of the tank fire extinguishing system.

Sources of information

1. Stulov T.T. and others. Reinforced concrete tanks for oil and oil products. Nedra, M., 1968, p. 233-234.

2. A.S. 280324. IPC B 65 d 87/00. Device for forming a fan ring jet of liquid. V.P. Sviridov, A.N. Leventsov, G.E. Lerke, B.I. Tolkachev and Yu.N. Pushkov. - 1297336 / 23-26; declared 1/14/69; publ. 08.26.70, Bull. 27, - p. 2.

3. A.S. 902840. At 05 V 1/04. Device for forming a fan ring jet of liquid. V.P. Sviridov, A.V. Sidorenko and B.I. Tolkachev. - 2942250 / 23-05; declared 06/16/80; publ. 02/07/82, Bull. 5.

Claims (1)

A device for forming a rotating fan ring jet of liquid, comprising a cylindrical body with a flange fixed with a gap above the bottom, characterized in that the bottom is provided with radial eccentrically arranged dividers made in the form of plates with a bevel on one side, while the length of the plates is less than the radius of the bottom of the device, on which they are mounted, and the height of the plates exceeds the gap between the housing and the bottom of the device.

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