JPS641513Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a sludge adhesion prevention device for preventing sludge from accumulating around a submerged pump in a crude oil storage tank or from adhering to the suction port of a submerged pump.

Generally, in above-ground tanks for storing crude oil,
In order to prevent sludge from accumulating or adhering inside the tank, a side entry mixer is installed at the bottom of the tank side plate to circulate the crude oil, and a warmer is installed inside the tank to facilitate the circulation of the crude oil. Trying to lower the viscosity of crude oil. However, when using such devices such as side entry mixers and heaters in underground tanks, there are issues with the installation location of the side entry mixer and how to drain the warmer, so it is necessary to use the same equipment as in above-ground tanks. I can't. Therefore, sludge accumulates around the submerged pump in the pump column that is installed through the tank roof, and sludge adheres to the suction port, making it difficult to pull up the submerged pump during maintenance, etc.
Further, there are drawbacks such as clogging of the submerged pump and lowering the efficiency of the pump.

Therefore, the purpose of this invention is to eliminate these conventional drawbacks by heating the crude oil around the submerged pump to reduce its viscosity, thereby preventing the accumulation and adhesion of sludge around the submerged pump. An object of the present invention is to provide a sludge adhesion prevention device.

According to this invention, the sludge adhesion prevention device for a submerged pump includes a heating chamber formed by a jacket provided concentrically with the pump column on the outer peripheral surface of the lower part of the pump column extending inside the storage tank, and a heating chamber in which steam is placed. It consists of a pipe installed to send a heating medium such as hot water or hot water, and another pipe installed to discharge the heating medium from inside the heating chamber to the outside of the tank.

Other objects, features and advantages of the invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings.

Figures 1 and 2 of the drawings show a floating roof type underground tank for crude oil storage equipped with a sludge adhesion prevention device for a submerged pump according to this invention, and the submerged oil pump 4 penetrates the floating roof 1. It is attached to the lower part of the pump column 3, which does not extend to the vicinity of the tank bottom plate 2. As clearly shown in FIG. 2, the sludge adhesion prevention device of this invention has a cylindrical jacket 5 on the outer periphery of the pump column 3, and the lower end of this jacket 5 is hermetically sealed to the flange 6 of the pump column 3. A heating chamber 7 is formed around the submerged pump 4 by fixing the pump column 3 to the pump column 3 and airtightly fixing the upper end to the outer peripheral surface of the pump column 3 . A ring pipe 9 connected to a heating medium pipe 8 extending through the floating roof 1 is provided in the upper part of the heating chamber 7, and from a plurality of nozzles 10 provided in the ring pipe 9, It is designed to emit a heat medium such as steam. Also,
A drain outlet 11 is provided at the lower part of the heating chamber 7 and is connected to a drain pipe 12 extending through the floating roof 1.

Valves 13 and 14 are attached to the pipe 8 and the drain pipe 12, respectively, so that the amount of steam in the heating chamber 7 can be adjusted by these valves 13 and 14. Further, it is preferable that a temperature sensor 15 is provided in the heating chamber 7 so that the amount of steam can be automatically controlled based on the temperature inside the heating chamber 7.

In the sludge adhesion prevention device of this invention constructed in this way, the steam sent to the heating chamber 7 warms the crude oil around the heating chamber, that is, the crude oil around the submerged pump 4. The heated crude oil has lower viscosity and better fluidity, and the temperature difference between the crude oil around the heating chamber 7 and the crude oil elsewhere causes convection, which causes the oil to flow around the submerged pump 4. source oil is agitated, thus preventing sludge buildup and adhesion. After the steam in the heating chamber 7 exchanges heat with the crude oil, it is discharged to the outside of the tank from the drain outlet 11 through the drain pipe 12 due to the pressure inside the heating chamber 7 as drain or steam. be done.

Further, especially when removing sludge adhering to the suction port 17 of the submerged pump 4, it is preferable to provide a sludge removing device as shown in FIG. In this sludge removal device, a ring pipe 20 having a plurality of nozzles 21 facing the suction port 17 of the submerged pump 4 is attached to the inner peripheral surface of the pump column 3. A pipe 22 penetrating the two is connected to each other. A cylinder of inert gas such as nitrogen gas is attached to the outside of the tank to the piping 22, and the inert gas is spouted from the nozzle 21 of the ring pipe 20 to remove the sludge that has accumulated in the submerged pump suction port 17. can be removed. Alternatively, the piping 22 is connected to the discharge pipe 16 of the submerged pump 4, and the heated crude oil pumped up by the operation of the submerged pump 4 is circulated and blown out from the nozzle of the ring pipe 20 to generate sludge. may be removed.

Further, in this embodiment, crude oil is heated using steam as a heat medium, but it goes without saying that a heat medium such as hot water or hot gas may also be used. Furthermore, although this embodiment has been described as a floating roof type underground tank, it can be used not only for underground tanks but also for other storage tanks such as above-ground tanks.

In this way, according to this invention, the adhesion and accumulation of sludge around the submerged pump is prevented by heating the crude oil around the submerged pump, so that the pump can always be operated properly. is possible,
It also makes lifting the submersible pump easier. In addition, the sludge adhesion prevention device of this invention is small and has a simple structure, so it can be easily assembled.
It has advantages such as very low manufacturing cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic explanatory diagram showing a cross section of a floating roof tank equipped with a sludge adhesion prevention device for a submerged oil pump according to this invention, Fig. 2 is an enlarged sectional view of the vicinity of the submerged oil pump in Fig. 1, FIG. 3 is a schematic sectional view showing a device for removing sludge from a submerged pump suction port. In the figure, 1: floating roof, 2: tank bottom plate, 3: pump column, 4: submerged pump, 5:
Jacket, 6: Flange part, 7: Heating chamber, 8:
Piping, 9: Ring pipe, 10: Nozzle, 11: Drain outlet, 12: Drain piping, 13, 14: Valve, 15: Temperature sensor.

Claims (1)

[Scope of utility model registration request] A heating chamber formed by a jacket provided concentrically with the pump column on the outer peripheral surface of the lower part of the pump column extending inside the storage tank, and piping provided to send a heat medium such as steam or hot water to the heating chamber; A sludge for a submerged oil pump characterized in that it consists of a separate pipe installed to discharge a heating medium from inside the heating chamber to the outside of the tank, and is capable of heating crude oil around the submerged pump in a pump column. Anti-stick device.