RU2370427C2 - Receiving-dispensing facility of reservoir - Google Patents

Abstract

FIELD: oil and gas industry.

SUBSTANCE: receiving-dispensing facility of reservoir consists of pipe with blind end attached to receiving-dispensing branch and with holes in its lower part on both sides. Nozzles are inserted into holes in the lower part of the pipe; a closed circular cavity is formed over each of the nozzle by means of a case; also holes are made in the nozzle and at the upper generatrix of the pipe thus communicating the nozzle with the upper part of pipe cavity via the closed circular cavity.

EFFECT: new design of receiving-dispensing reservoir.

2 dwg

Description

The invention relates to the oil industry and can be used in enterprises having vertical cylindrical tanks for storing oil and oil products, mainly tanks with pontoons and floating roofs.

The liquid is fed into the tank through the acceptance pipe welded into the tank wall. Inside the reservoir, a receiving and distributing device of various designs is connected to the receiving and distributing pipe: clappers, clappers with a receiving and distributing chamber, etc. / 1, 2, 3 /. The disadvantage of these receiving and distributing devices is that when a gas plug gets into the tank from the supply pipelines, these gases quickly float to the surface of the liquid, forming gas-liquid fountains. These fountains exert a force effect (impact) on a pontoon or a floating roof in the tank, and sometimes large volumes of liquid are thrown out onto the upper surface through a side gap or valve. Numerous cases of flooding and destruction of pontoons, especially light pontoons of float type and one-deck pontoons of plate type, are known.

A diffuser-type receiving and distributing device / 4 / is known, which is a long pipe (sometimes it reaches the center of the reservoir), slotted openings are cut out on both sides for liquid exit, and its end is plugged. The holes in the pipe as it moves away from the entrance to the tank increase in cross section so that the flow rate of liquid from all holes is the same. These receiving and dispensing devices also have a drawback, since in the pipe there is a stratification of the flow into liquid (below) and gas, which cannot be displaced through openings located below the surface of the liquid. In this case, the gas is displaced from the pipe into the tank in portions as it accumulates and contracts. Thus, this receiving-distributing branch pipe does not completely relieve the pontoon from the danger of hydraulic shocks, although it softens their impact on the pontoon.

The proposed receiving and distributing device is a pipe with a plugged end, in the lower part of which holes are cut on both sides, into which nozzles are inserted having holes on the upper generatrix. A hole is made in the pipe wall, on its upper generatrix, and a closed cavity is formed with the help of a casing over the holes in the pipe and nozzle around the pipe with the possibility of communication through it of the nozzle with the upper pipe cavity. Due to the communication of the upper part of the pipe cavity where the gas is located, the gas is sucked (ejected) with the nozzle by a stream of liquid in the nozzle with the nozzle. The suction is formed due to the fact that in the nozzle the fluid velocity is greater than in the pipe. Gas suction occurs continuously and in small portions while there is fluid movement in the nozzle. As a result, the pulsating exit of large volumes of gases from the receiving-distributing branch pipe to the tank is excluded, therefore, the force effect of gas plugs on the pontoon is excluded.

The figures schematically depict the proposed receiving and distributing device.

Figure 1 - location of the dispensing device inside the tank.

Figure 2 is a cross section of the casing and nozzle along aa (see figure 1).

The receiving and distributing device is a pipe 1, which is connected at one end to the receiving and distributing pipe 2 on the wall of the tank 3 by means of a flange connection 4, its other end is plugged with a plug 5, which has a small opening 6 at the bottom for fluid outflow. In the lower part of the pipe 1 (closer to the lower generatrix), approximately equal distances from each other from two sides are cut holes into which the nozzles are inserted 7. The cross section of these holes, with increasing distance from the flange 4, increase to ensure equal flow from all holes (nozzles). A closed cavity 9 is formed around the nozzles 7 around the pipe 1 using a casing 8 installed (for example, by welding) around the pipe, and a hole 10 is made in the body of the nozzle 7 for the cavity 9 to communicate with the nozzle 7. In the upper generatrix of the pipe 1, holes 11 are made for the gas the cavity of the pipe 1 with a closed cavity 9. The pipe 1 is located at a small distance from the bottom of the tank 12 and is attached to it by means of a support with a clamp 13.

The proposed receiving and distributing device operates as follows.

When liquid is supplied to the tank through the receiving-distributing pipe 2, it flows out of the tank through nozzles 7 with approximately the same flow rate from all nozzles. If a gas plug (air, gas-air mixture) enters the reservoir, in the pipe 1, the flow separates into gas (above) and liquid. The liquid flows from the tank through the nozzle 7. Since the cavity of the nozzle 7 is communicated through the openings 10 and 11 with the gas cavity of the pipe 1, the gas from the pipe will be sucked into the stream of liquid flowing from the nozzle 7 into the tank. Gas suction will be carried out continuously, in small portions. The proportion of gas sucked in by the liquid stream depends on the size of the cross section of the holes 10 and the pressure difference in the pipe 1 and the nozzle 7. The pressure in the nozzle is always less than in the pipe 1, since the speed is higher in the nozzle. As a result, a gas-liquid mixture flows through the nozzles into the reservoir, in which the gas is mixed, leaves the nozzles dispersed and rises in the liquid in the form of small bubbles, and not in the form of gas plugs. Therefore, gas does not significantly affect the pontoon and the floating roof. This is the positive effect of the proposed acceptance device.

The cross section of the hole 10 is determined constructively or by calculation based on the ratio of the volumes of gas and liquid entering the reservoir, provided that the total flow rate of the liquid and gas from all nozzles is equal to the flow rate in the receiving and distributing branch pipe.

Information sources

1. Patent of the Russian Federation, No. 2191730. 05/05/11.

2. RF patent, No. 2189929, 2000.12.14.

3. RF patent, No. 2036124, 04.16.92.

4. Drawing of Ultraflote Corporation, No. 20234, 10/12/92.

Claims (1)

The receiving and distributing device of the tank, comprising a pipe attached to the receiving and distributing pipe with a plugged end and having openings on both sides in its lower part, characterized in that nozzles are inserted into the openings in the lower part of the pipe, a closed annular ring is formed over each nozzle cavity, and in the nozzle and on the upper generatrix of the pipe holes are made with the possibility of communication, through a closed annular cavity, nozzles with the upper part of the cavity of the pipe.

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