RU58958U1 - VACUUM INSTALLATION OF CONTINUOUS ACTION FOR CLEANING RESERVOIRS FROM RESIDUALS OF OIL PRODUCTS AND BOTTOM DEPOSITS - Google Patents

Abstract

The utility model relates to installations for cleaning hollow products, in particular tanks, and can be used in warehouses and fuel bases in preparing tanks for inspection or repair, as well as when using tanks for other petroleum products. The technical result of the utility model is to increase the efficiency of cleaning tanks from oil product residues and bottom sediments while reducing manufacturing, installation and operation costs. This technical result is achieved in that the installation, consisting of two reservoir tanks 1 and 2, a vacuum pump 3, a piping system with shut-off valves and a gripping device, further comprises a washing solution supply unit connected by a flexible pipe 14c to the pipe 11. At the upper end of the pipe 11, a shut-off valve 13 is installed, and a nozzle 12 is installed on the bottom. The gripping device is made in the form of a diffuser 7 mounted on the end of the knee-shaped pipe 6, under which a scraper 10 is fixed behind the diffuser 7. The edge 10 is missing a tube 11, mounted on a gripper at an angle to the horizontal plane. The moving mechanism of the gripping device is made in the form of a trolley 15 located behind the scraper 10, and a flexible hose 30 for suctioning the residues of oil products and bottom sediments, connected to the elbow pipe 6, is placed on the rollers 43. 4 ill., 1 table.

Description

The utility model relates to installations for cleaning hollow products, in particular tanks, and can be used in warehouses and fuel bases in preparing tanks for inspection or repair, as well as when using tanks for other petroleum products.

In accordance with the requirements of GOST 1510-84 "Oil and petroleum products. Marking, packaging. Transportation and storage "tanks should be periodically cleaned of oil residues, rust and bottom sediments.

As the practice of operating steel vertical tanks has shown, the value of the technological non-sludge (“dead”) residue depends on the diameter of the tank and can be several tens of cubic meters, and the thickness of the sediment layer on the bottom of the tank is several tens of centimeters.

Cleaning tanks from oil product residues is a complex and time-consuming process and largely depends on the design of the devices with which this operation is performed.

An equally laborious operation is the removal of bottom sediments, especially when viscous petroleum products, especially fuel oil, have been stored in the tank for a long time.

An analysis of the sources of patent information showed that there is a known installation for cleaning tanks from oil product residues, containing a vacuum pump and a collection tank, interconnected by pipelines. A cutter is installed on the lid of the collection tank. The installation is equipped with a gripping device moving along the bottom of the cleaned tank, including a hollow holder, in the lower part of which is installed

a cylindrical glass with a float placed in it (RU P. No. 1238155, class. B 08 V 9/08, 10/20/2004).

The disadvantage of this installation is the frequency of its operation, associated with the need to empty the collection tank after filling it with the product to be cleaned, which leads to an increase in the cleaning time of especially tanks with a large technological residue.

In addition, it is difficult to move the gripping device together with the suction sleeve when cleaning the tank, as well as the fact that the gripping device (in the form of a glass with a float) does not allow cleaning tanks with a large amount of mechanical impurities. Additional equipment is required to remove solid bottom sediments.

Also known is a device for removing oil residue from the bottom of the tanks, including a gripping device connected by a flexible hose to a jet liquid ejector, the pressure line of which is connected to the oil residue collector. Vacuum in the ejector is created by a liquid pump. The exciting device is made in the form of a disk with channels made in the shape of Archimedes spirals. The disk has a nozzle, which is connected to the ejector with a flexible hose. The gripping device moves along the bottom of the tank with the help of a rod fixed on the disc nozzle (RU P. No. 2150340 C 1, class. 08 V 9/08, 10.06.2000).

The disadvantage of this installation is the unreliability of operation due to the possibility of clogging of the liquid ejector with cleaning products, since the liquid is supplied directly from the collection of contaminated oil residues to the ejector and, in addition, the insufficient removal efficiency of bottom sediments.

Closest to the utility model in technical essence is the installation for the removal of oil residues and sludge from the bottom of the tank, including a gripping device connected to the receiver (one or more), and with a vacuum pump piping system with shutoff valves. The capturing device is made in the form of a disk with a central

a through hole to which a pipe connected to a flexible hose is attached through a ball joint. A rod is mounted on the nozzle to move the disc. On the lower surface of the disk, metal plates are fixed, curved in a spiral of Archimedes and diverging from the central hole to the edges of the disk. Elastic bands of polymer material are attached to the lower edges of the plates along their entire length. To ensure the movement of the gripping device vertically and horizontally, a radial monorail with trolleys and an annular monorail mounted on the vertical wall of the tank are installed inside the tank. Each monorail has an electric drive, which is also located inside the tank (RU P. No. 2141387, C1 class. 08 V 9/08, 11/20/1999).

The disadvantage of this installation are:

bulkiness and complexity of installation of equipment inside the tank;

significant costs for the manufacture, installation and operation of equipment;

lack of bottom removal efficiency;

increased fire and explosion hazard of all moving and rotating mechanisms installed inside the tank (electric motors).

The technical result of the utility model is to increase the efficiency of cleaning tanks from oil product residues and bottom sediments while reducing manufacturing, installation and operation costs.

This technical result is achieved by the fact that the known installation for cleaning tanks from oil residues and bottom sediments, containing a gripping device with a flexible hose for removing contaminated residues and bottom sediments, reservoir tanks, connected in parallel to the vacuum pump by a pipeline system with shut-off valves, and a mechanism the movement of the gripping device, according to the proposed utility model, the installation further comprises a washing solution supply unit connected by a flexible pipe gadfly with the tube, at the upper end of which the stopcock is set, and at the bottom - the nozzle, and exciting

the device is made in the form of a diffuser mounted on the end of the knee-shaped pipe, under which a scraper is attached to the diffuser, through which a pipe is passed through, which is mounted on the gripping device at an angle to the horizontal plane, while the gripping mechanism is made in the form of a cart placed behind the scraper and a flexible hose for suctioning residues of oil products and bottom sediments connected to an elbow pipe is placed on rollers.

Figure 1 presents a continuous vacuum unit for cleaning tanks from oil product residues and bottom sediments;

figure 2 - a gripping device;

figure 3 is the same (view according to B, figure 2);

figure 4 - the attachment of the flexible hose on the rollers (view aa in figure 2).

A continuous vacuum installation for cleaning tanks from oil product residues and bottom sediments consists of two reservoir tanks 1 and 2, a vacuum pump 3, a gripping device, a washing solution supply unit and a piping system with shut-off valves. The washing solution supply unit includes a liquid pump 4 and a washing solution tank 5. The gripping device consists of an elbow pipe 6 on which a diffuser 7 and a shut-off valve are installed 8. To control the vacuum on the elbow pipe 6, a vacuum gauge 9 is installed. A scraper 10 is fixed under the elbow pipe 6 behind the diffuser 7, in which there is an opening (without position), for the passage of the tube 11 with the nozzle 12, at the opposite end of which a stopcock 13 is installed. The tube 11 is mounted on an elbow pipe 6 of the gripping device at an angle to the horizontal plane and is connected with the pressure line of the liquid the sucker 4 of the washing solution supply unit by a flexible conduit 14. The gripping device moving mechanism consists of a trolley 15 on which a knee-shaped pipe 6 and a handle 16 are fixed. The trolley 15 has wheels 17 fixed in

forks 18, which are mounted on the trolley 15 with the possibility of rotation around a vertical axis.

The scraper 10 is fixed to the diffuser 7 on an elbow pipe 6 with the possibility of adjusting its height position (for example, using a bolted connection).

On the covers of reservoir tanks 1 and 2, cutoffs 19 and 20 of the fluid flow and signaling devices 21 and 22 of the maximum level of liquid filling are installed. The signaling devices 21 and 22 of the maximum liquid filling level are tubes, the lower ends of which are installed at a predetermined distance from the tank lid, and the upper parts of the tubes are connected to the vacuum manometers 23 and 24.

The suction line 25 of the vacuum pump 3 is connected to the shut-off valves 21 and 22 of the collection tanks 1 and 2 through a three-way shut-off valve 26, and the pressure line 27 of the vacuum pump 3 is connected through a three-way shut-off valve 28 with nozzles (without positions) on the covers of the collection tanks 1 and 2.

To fill the reservoir tanks 1 and 2 with the product to be cleaned, the gripper is connected to the reservoir tanks 1 and 2 via a three-way shut-off valve 29 with a flexible hose 30 and pipelines 31 and 32, which are connected to the nozzles (without positions) on the bottoms of the reservoir tanks 1 and 2 .

To drain the product from the tanks of the collectors 1 and 2 on opposite bottoms there are nozzles (without positions), which are connected through the pipelines 33 and 34 and the three-way shut-off valve 35 to the drain line 36.

A vacuum gauge 37 is installed on the suction line of the vacuum pump 3, and a shut-off valve 38 for discharging the gas-air mixture is installed on the pressure line.

To degass the cleaned tank, a ventilation unit 39 is installed on its inspection hatch located on the roof.

In order to facilitate the movement of the flexible hose 30 along the bottom of the tank to be cleaned, removable clamps 40 with supports 41 for fixing forks 42 with rollers 43 are installed on it after 1-1.5 m from each other. Removable clamp

40 in the upper part is provided with a lock 44, and in the lower part, a longitudinal support plate 45. A holder 46 is attached to the removable collar 40 for fixing the flexible pipe 14. The forks 42 are mounted in supports 41 for rotation about a vertical axis.

Cutoff 19 (20) is a known float valve. It eliminates the ingress of liquid from the reservoir tanks 1 and 2 into the vacuum pump 3 in case of overflow.

The electric motors of the vacuum pump 3, the liquid pump 4, and the ventilation unit 39 are supplied through a cabinet 47 of power supply voltage of 380 V from the mains of the warehouse or fuel base.

As reservoir tanks 1 and 2, RA-2 tanks commercially available by industry with a capacity of 2 m ³ with ellipse bottoms can be used.

As a vacuum pump 3, a commercially available pump of the CAO52 ШМ brand with an electric motor with a power of 15 kW was used. The maximum vacuum of the pump is 0.09 MPa.

As a liquid pump 4, a washing machine of the brand SM-1-10 with an electric motor with a power of 4 kW was used. The pump head is up to 10 MPa, and the feed is up to 1 m ³ / h.

As a ventilation installation, a commercially available explosion-proof fan of model B-06-300-6.3 with an electric motor with a power of 1.1 kW was used.

All equipment of the installation can be placed on special platforms with dimensions: length 3 m, width 2.3 m and transported by road, or can be placed on KamAZ-type vehicles.

The entire process of cleaning tanks from oil product residues and bottom sediments consists of several sequential operations.

"A" - preparatory, consisting in the degassing of the cleaned tank with the subsequent placement of the gripping device inside the tank;

"B" - creating a vacuum (vacuum) in the reservoir tank 1 and filling it with cleaning products;

“C” - creating a vacuum in the collection tank 2, filling it with scraping products and draining from the collecting tank 1;

"G" - the creation of rarefaction in the reservoir tank 1, filling it with the products of stripping and discharge from the reservoir tank 2;

"D" - cleaning the tank from solid deposits.

Three-way shut-off valves 26, 28, 25 and 35 have two positions: position I - normally open and position II - normally closed.

The position of the shut-off valves of the installation when performing these operations is presented in the table.

Table
Position of stopcocks during operations Operations operations Stopcocks (positions) Note 8* 13** 26 28 29th 35 38 Shutoff Valve Position "A" - preparatory 3 3 S - closed; O - openly;
H.3 - normally closed;
N.O. - normally open. "B" - creating a vacuum (vacuum) in the reservoir tank 1 and filling it with cleaning products BUT H. H BUT H. H ABOUT "C" - creating a vacuum in the collection tank 2, filling it with cleaning products and draining from the collection tank 1 H. H BUT H. H BUT Z.

Table end "G" - creating a vacuum in the collection tank 1, filling it with cleaning products and draining from the collection tank 2 BUT H. H BUT H. H 3 "D" - cleaning the tank from bottom sediments * - The shut-off valve 8 is opened periodically by the operator when cleaning the residual oil products. ** - The shut-off valve 13 is opened periodically by the operator when the bottom sediments are washed out with water or a washing solution.

Vacuum installation of continuous operation is as follows.

Before cleaning the tank from the remnants of oil products and bottom sediments, perform operation "a". To do this, the cabinet 47 power supply is connected to the cable from the mains of the warehouse or fuel base. Remove the cover from the manhole located in the lower part of the body of the tank to be cleaned, remove the cover from the neck of the light door located on the roof of the tank to be cleaned, and instead install a ventilation unit 39 in the neck. Turn on the ventilation unit and pre-degass the tank to a safe vapor concentration oil product. At the same time carry out the heating of water or washing solution in the tank 5.

Then, through the hatch-hole of the tank being cleaned, a gripping device with a flexible hose 30 on the rollers 43 and a flexible pipe 14 is connected. The shut-off valves 8 and 13 on the bend pipe 6 and on the pipe 11 must be closed.

To perform operation "b", the shut-off valves 26 and 29 are set to the normally open position, and the shut-off valves 28 and 35 to the normally closed position. The stopcock 38 is open.

Turn on the vacuum pump 3 and in the reservoir tank 1, create a vacuum of 0.07-0.09 MPa, which is controlled by a manovacuum meter 23 and a vacuum gauge 37.

At the same time, the operator enters the tank to be cleaned through the manhole, observing safety measures and installs a gripping device in the place of accumulation of oil product residues. Upon reaching a vacuum of 0.07 MPa in the flexible hose 30, the operator periodically opens the shut-off valve 8 and sucks the petroleum products, moving the gripping device along the bottom of the tank. The vacuum in the flexible hose 30, he controls the manovacuum gauge 9.

Residues of petroleum products from the cleaned tank through a flexible hose 30 are sucked into the collection tank 1.

While filling the collection tank 1 with the product to be cleaned, the second operator, who is near the vacuum pump 3, monitors the readings of the vacuum gauge 23 and the vacuum gauge 37.

Upon reaching the maximum level of inflow in the collection tank 1, the liquid blocks the tube section on the indicator 21, while the arrow on the manovacuum meter 15 is set to zero or slightly higher, and on the vacuum gauge 37, the arrow is set at 0.08-0.09 MPa.

The second operator proceeds to the operation "in". To do this, he sets the shut-off valves 26, 29 in a normally closed position, and the shut-off valves 28 and 35 - in a normally open position. The shut-off valve 38 closes.

In the collection tank 2, a vacuum is created and oil begins to flow into it from the cleaned tank. At the same time, pressure is created in the collection tank 1 and the oil product is drained from it along the drain line 36 into a pre-prepared container. The magnitude of the vacuum in the reservoir tank 2 is controlled by a vacuum gauge 24.

After filling the reservoir tank 2, the second operator proceeds to perform operation "g". To do this, he sets the shut-off valves 26 and 29 in a normally open position, and the shut-off valves 28 and 35 - in a normally closed position. The shut-off valve 38 must be closed. Operations “c” and “g” can be repeated until the tank is completely cleaned of oil product residues.

After cleaning the tank from the remnants of oil products proceed to the operation "d". For this, the second operator turns on the liquid pump 4, and the operator located inside the tank to be cleaned moves the pickup device to the place of accumulation of solid bottom sediments, opens the shut-off valve 13 and erodes the bottom sediments. Using a scraper 10, he shifts them to one place, from which they are sucked into a free collection tank.

Thus, the use of this installation will improve the efficiency of cleaning tanks from residues of oil products and bottom sediments.

Claims (1)

Continuous vacuum installation for cleaning reservoirs from oil product residues and bottom sediments, containing a gripping device with a flexible hose for removing contaminated residues and bottom sediments, collecting tanks connected in parallel to the vacuum pump by a piping system with shut-off valves, and a gripping device moving mechanism the fact that the installation further comprises a washing solution supply unit connected by a flexible pipe to a tube at the upper end of which a shut-off valve is installed, and a nozzle is installed on the bottom, and the gripping device is made in the form of a diffuser mounted on the end of the knee-shaped pipe, under which a scraper is attached to the diffuser, through which a pipe is passed through, which is mounted on the gripping device at an angle to the horizontal plane, the mechanism for moving the gripping device is made in the form of a trolley located behind the scraper, and a flexible hose for suctioning residues of oil products and bottom sediments, connected to the elbow pipe, is placed on commercials.