RU137873U1 - OIL PRODUCT STORAGE TANK - Google Patents

Abstract

1. A tank for storing petroleum products containing a receiving, breathing and safety valve, a manhole, light and metering hatches, a fire fuse, a pick-up nozzle, a sampler, a floating fuel intake, a heat detector, a level indicator, a clapper, a drainage water discharge pipe, characterized in that that it additionally contains a device for the continuous cleaning of oil products from oil-containing sediments, oil sludge, drainage water and mechanical impurities. 2. The tank according to claim 1, characterized in that the device for the continuous purification of petroleum products contains a pump, a filter and a hydrocyclone equipped with nozzles for draining the separated water and returning the refined petroleum product to the tank. The tank according to claim 1, characterized in that it contains a cutter mounted above the drain pipe. The tank according to claim 1, characterized in that it contains a pipe extending from the drain pipe to the opposite wall of the tank, the lower part of the pipe having holes whose diameter increases from the drain pipe to the side of the opposite wall of the tank. The tank according to claim 1, characterized in that it comprises a duct extending from the drain pipe to the opposite wall of the tank, made in the form of a half cylinder with edges having cutouts in the shape of a semicircle, the diameter of which increases from the drain pipe to the side of the opposite wall of the tank.

Description

The invention relates to means for storing and transporting liquids and can be used in industries related to the reception, storage and delivery of non-water-miscible liquids, mainly oil products.

In any tank operated for the extraction, processing and storage of petroleum products, deposits (oil sludge) accumulate over time, and it is necessary to clean the tank from them. Sediment is a dense mass deposited unevenly on the bottom and interferes with the progress of the fuel; regular cleaning of the tank prevents this. Moreover, due to untimely cleaning of the tank, the useful volume of the tank is reduced and operational characteristics are reduced. Normative acts prescribe the mandatory inspection of the technical condition of the tank with the cleaning of the tank every 5 years.

Currently used traditional technologies are environmentally hazardous, time consuming, inefficient and extremely expensive. Components of high cost are large heat and energy consumption, significant water consumption, the need for stationary treatment facilities and equipment for the separation of petroleum products.

The frequency of cleaning containers is set out in the requirements of GOST 1510-84 and depends on the type of oil products, the technical condition of the tanks, storage conditions and the frequency of change of grade of oil products. Frequent cleaning of fuel tanks is provided for fuel tanks, which are subject to high quality and cleanliness requirements: jet engine fuel, aviation and straight-run gasolines, oils and their components. In this case, periodic cleaning should be carried out at least twice a year. Once a year they clean fuel tanks with lubricants and additives. Tanks with diesel fuel, gasoline, paraffins are cleaned once every two years. Cleaning of fuel oil tanks, tanks with motor fuels is carried out as necessary, to ensure conditions of reliable operation and consumer properties of petroleum products.

Water naturally accumulates in fuel tanks as a result of condensation or during filling with fuel, through ventilation openings. Water and temperature changes create the conditions for the growth of microorganisms and the natural oxidation of fuel, accelerating the formation of sludge, acids and corrosion of the tank. A change in fuel quality may cause equipment failure or equipment operation may be unreliable.

A known tank for storing, dispensing and separating crude oil from water [RF Patent 62909], comprising vertically mounted two dispensing nozzles with shutoff valves for dispensing crude oil above the water level, two siphon taps for determining the water level, a drainage nozzle with valve and pipeline communications for the purpose of pumping (discharge) of produced water.

A known tank [RF Patent 2444469] the spillway system of which includes a vertical fixed stand made in the form of a perforated pipe, the lower end of which is hermetically attached to the bottom of the tank and the drain pipe, and the perforated part is passed through the water receiving cup of the floating roof, and the perforated part of the vertical rack enclosed in a corrugated casing, the upper pipe of which is fixedly attached to the wall of the water intake cup, and the lower pipe is fixedly attached to the rack the perforations.

Known fuel system of a submarine, including external fuel tanks, a device for sludge and fuel supply to a diesel engine with a sludge discharge pipe to the waste fuel tank [RF Patent 2127209] made in the form of a continuous inertial separator [RF Patent 2077916] equipped with a medium separation sensor and an automated control valve located on the sludge discharge pipeline, while the external fuel tanks are elongated to provide fuel back-up to the separator and diesel.

This solution is the closest in technical essence and we have taken as a prototype.

The disadvantages of the prototype include the complexity of the manufacturing technology of the inertial separator of continuous operation, the need to create a constant backwater to ensure the trouble-free operation of the separator, a low degree of purification of fuel from mechanical impurities (60-70%), a complex tank binding system (phase separation sensor, valve with automated control )

The objective of the invention is to increase the reliability of operation of the tanks by ensuring constant cleaning of the tank from the separated water, solids, oily sediments and oil sludge, simplifying the technology of their manufacture.

This object is achieved in that the reservoir further comprises a device for the continuous purification of oil products from oily sediments, oil sludge, drainage water and mechanical impurities.

The invention is illustrated by drawings, where in FIG. 1 schematically shows a longitudinal section of a tank for storing oil products, which consists of a tank body 1, containing a receiving 2, breathing 3 and safety 4 valves, manhole 5, light 6 and metering 7 hatches, fire fuse 8, receiving and distributing pipe 9, a sampler 10, a floating fuel intake 11, a temperature detector 12, a level gauge 13, a clapper 14, a drain pipe 15 and a device for the continuous cleaning of oil products from oily sediments, oil sludge, drainage water and mechanical impurities 16 minutes, the return pipe 17 of the purified product in the tank 1 and return pipes of the pure product 18 and drain 19. The drain water to the drain water flow direction towards the drain pipe 15 on the drainage water it cutter 23 is mounted.

A device for the continuous cleaning of petroleum products from oily sediments, oil sludge, drainage water and mechanical impurities 16 consists (Fig. 2) of a pump 20, a coalescence filter 21 and a hydrocyclone 22.

To direct the flow of drainage water from the opposite wall of the tank to the drain pipe drainage pipe 15, the tank contains a pipe 24 (Fig. 3) extending from the drainage pipe 15 to the opposite wall of the tank 1, and the lower part of the pipe 24 has holes 25, the diameter of which increases from the drainage pipe 15 towards the opposite wall of tank 1 (d1 <d2 <d3 <d4 <... <dn-1 <dn).

To direct the flow of drainage water from the opposite wall of the tank to the drain pipe 15, the tank contains a duct 26 (Fig. 4) extending from the drainage pipe 15 to the opposite wall of the tank 1 made in the form of a half cylinder with edges having cutouts 27 in the shape of a semicircle whose diameter increases from drainage pipe 15 towards the opposite wall of the reservoir 1 (d1 <d2 <d3 <d4 <... <dn-1 <dn).

The proposed device operates as follows: with a pump 20, a bottom layer of liquid containing drainage water, mechanical impurities and oil is sent to a coalescent filter 21, where mechanical impurities are retained and water coagulates into large droplets that settle to the bottom of the filter. From the coalescence filter 21, the refined oil product enters the hydrocyclone 22 where the after-treatment of the oil product from water takes place, and the dry refined oil product is returned to the tank 1 through pipeline 17. The separated water from the coalescence filter 21 and the hydrocyclone 22 through the drainage water discharge pipes 19 enters the drainage water system.

To verify the effectiveness of the claimed method and the operability of the proposed installation, we selected a sample of produced water and bottom sediments from a long-term storage tank of diesel fuel L in accordance with GOST 305-82. Part of the sample was poured into a liter cylinder, and after 24 hours of sedimentation, the composition of the sample was visually determined. The sample contained 176 ml of sediment, 706 ml of water and 128 ml of diesel fuel.

After cleaning the taken sample in a laboratory setting, the purified diesel fuel was analyzed for water and solids. The analysis results are shown in the table:

Diesel fuel sample The content of the fur. impurities according to GOST 6370-83,% Water content GOST 2477-65,% Before cleaning 1.47 0.25 After cleaning lack of lack of Requirements GOST 305-82 lack of lack of

As can be seen from the data given in the table, diesel fuel fully complies with the requirements of GOST 305-82 and can be used for its intended purpose.

The claimed device allows from a mixture of oil products and drainage water contaminated with mechanical to obtain an oil product that meets the requirements of GOST, which indicates the achievement of a new technical effect and the compliance of the claimed solution with the criterion of "inventive step".

Claims (5)

1. A tank for storing petroleum products containing a receiving, breathing and safety valve, a manhole, light and metering hatches, a fire fuse, a pick-up pipe, a sampler, a floating fuel intake, a thermal detector, a level gauge, a cracker, a drainage water discharge pipe, characterized in that that it additionally contains a device for continuous cleaning of oil products from oil-containing sediments, oil sludge, drainage water and mechanical impurities. 2. The tank according to claim 1, characterized in that the device for continuous purification of petroleum products contains a pump, a filter and a hydrocyclone equipped with nozzles for draining the separated water and returning the refined petroleum product to the tank. 3. The tank according to claim 1, characterized in that it contains a cutter mounted above the drain pipe. 4. The tank according to claim 1, characterized in that it comprises a pipe extending from the drain pipe to the opposite wall of the tank, the lower part of the pipe having holes whose diameter increases from the drain pipe to the side of the opposite wall of the tank. 5. The tank according to claim 1, characterized in that it comprises a duct extending from the drain pipe to the opposite wall of the tank, made in the form of a half cylinder with edges having cutouts in the shape of a semicircle, the diameter of which increases from the drain pipe to the side of the opposite wall of the tank.

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