RU219342U1 - SCALER FOR HORIZONTAL STEEL TANK - Google Patents

Abstract

The utility model relates to wastewater treatment devices and is applicable in the oil industry. The skimmer for a horizontal steel tank is made with side and top openings. The flotation tank is equipped with lower and upper rectangular circuits, connected to a collector with the possibility of passing water with air at the attachment points. The lower circuit has a pipe section and is mounted on supports, which are fixed to the bottom of the tank. The connection of the contours is carried out at the expense of pipe sections. The contours are parallel to each other and the earth's surface. EFFECT: increased efficiency of wastewater treatment from oil products and suspended solids, increased plant productivity and filter life, as well as reduced energy consumption of the treatment process. 3 ill.

Description

According to GOST 17032-2010, horizontal steel tanks (RGS) are produced with a capacity of 3 to 100 cubic meters. The design of this tank is a hollow cylinder with two walls. A feature of this design is that the width of the CGS increases from the bottom to the middle of the tank.

Known installation of wastewater treatment at gas stations using pressure flotation and a tank for collecting petroleum products. [Matveev Yu.A. et al. Patent for invention No. 2613293 dated March 15, 2017].

On the grate for receiving wastewater, which has a suction pipeline, with a valve, two cone-type sedimentation filters with valves and pipelines are equipped to remove mechanical impurities. Also, in addition, settling tanks are equipped with two filter meshes, with cells of different diameters. The settling filters are connected by means of a process pipeline to a waste water collection tank, in which two intake pipes are mounted: an upper pipe for collecting suspended solids with an upper layer of waste water and a lower pipe for pumping waste water. Also, settling tanks are equipped with an upper pipe for taking oil products. The wastewater treatment plant includes electric pumping units. The first electric pumping unit is designed for pumping oil products with a top layer of water into a tank for collecting oil products. The same electric pumping unit is designed for pumping contaminated wastewater through the process pipeline into a coarse filter, a membrane-type fine filter and into a clean water tank.

The second electric pumping unit is used to supply clean water through the intake pipe through the clean water pipeline to the city storm sewer or to the ground. This electric pump unit is also used for self-cleaning of fine and coarse filters. After the self-cleaning of the filters, the sludge with water enters the sludge tank through the pipeline.

The functions of the first electric pumping unit also include the pumping of suspended solids with the upper layer of water from the tank through the process pipeline and the pipeline to the sludge tank.

The tank for collecting oil products is connected with the tank for collecting waste water by means of a process pipeline. A viewing device is mounted on the process pipeline below the tank to separate oil products from water, which includes a housing, sight glass and flange connections. Also, in order to take oil products from the sedimentation filters and suspended solids from the tank, the corresponding intake pipes are inserted into the corresponding tight swivel joints located in pipes of a larger diameter. In this case, the length of the intake pipe is regulated by a sealed swivel joint. In order to pump oil products and suspended solids with the least amount of waste water, the intake pipes are equipped with horizontal outlets. Intake pipes, swivel joints and pipes of large diameter for pumping oil products and suspended solids are made in a similar way.

Pumping out from the reservoir filled with oil is carried out through the pipeline using an electric pump unit.

In order to carry out pressure flotation in the wastewater collection tank, the process pipeline is equipped with an appropriate electric pump unit with an ejector. In this case, the ejector has an air duct. The ejector sucks in air due to the water pressure created by the pump. Air consumption is 1.5-2% of the amount of water supplied. The tank for pressure reduction during pressure flotation is equipped with an air release valve.

The installation works as follows. Through the grate for receiving wastewater, the intake pipeline, with the corresponding valve open, contaminated wastewater with mechanical impurities, suspended solids and oil products enters the first filter-sump. In the sump, part of the mechanical impurities due to gravitational forces is deposited on the bottom of the sump filter. Mechanical impurities of a larger diameter are retained by the first grid, and those of a smaller diameter by the second grid. During settling, oil products rise to the surface of the liquid due to their lower density.

Subsequently, with the help of the first electrical installation, through the corresponding upper intake pipe with horizontal outlets, the oil products with the upper layer of water enter the tank for collecting oil products. In this case, the operator adjusts the length of the intake pipe using a sealed swivel joint.

After oil products are pumped out of the sump, water is supplied to the wastewater collection tank with the help of an appropriate electric pumping unit. At the same time, air is supplied to the electric pumping unit by an ejector, which, together with waste water, enters the process pipeline and then into the tank. When rising in the tank, air bubbles take suspended solids with them and lift them into the upper layer of the liquid. The air pressure in the tank is reduced by a relief valve. Then, with the help of the first electrical installation, through the corresponding upper intake pipe with horizontal outlets, the suspended solids with the upper layer of water enter the sludge tank through the pipeline.

After the suspended solids are pumped out with the help of the first electric pumping unit, the contaminated wastewater is fed through the pipe and the technological pipeline with the appropriate valve open to the coarse filter, then to the membrane-type fine filter and to the clean water tank.

Clean water from the tank is pumped out by the second electric pump unit through the intake pipe through the clean water pipeline into the city storm sewer or onto the ground.

From the tank, the settled water through the pipeline and the corresponding open valve enters the viewing device for separating oil products from water.

To determine the level of water, oil products and suspended solids in the tank and in the settling filters, the operator uses a meter rod and water sensitive paste. The operator then sets the length of the intake pipe using a leak-tight swivel to more accurately sample the volume of oil products and suspended solids.

The disadvantages of this setup are:

1. Lack of a flotator in the installation.

2. Low efficiency of flotation throughout the tank.

It is also known to install pressure flotation for wastewater treatment at gas stations. [Bogdanov A.Yu., Matveev Yu.A. Utility model patent No. 194306 dated December 5, 2019].

The wastewater collection tank is equipped with two intake pipes: an upper pipe for collecting suspended solids and oil products and a lower pipe for pumping wastewater. The top pipe is equipped with horizontal outlets. Pipes have valves. In order to take oil products and suspended solids from the tank, the intake pipe is inserted into a sealed swivel joint. In this case, the length of the intake pipe is regulated by a sealed swivel joint. The wastewater treatment plant includes an electric pumping unit, which supplies wastewater to the reservoir through a process pipeline. The process pipeline in the lower part of the tank is equipped with a manifold with holes for air supply and waste water.

To carry out pressure flotation in the tank, the electric pump unit is equipped with an ejector. It should be noted that the ejector has an air duct. The ejector sucks in air due to the water pressure created by the pump. Air consumption is 1.5-2% of the amount of water supplied.

The tank for pressure reduction during pressure flotation is equipped with an air release valve, and for measuring the liquid level with a gauge hatch. Also, the tank is equipped with a neck in the form of a cylindrical elongated structure. This neck is designed for more efficient pumping of oil products and suspended solids using a top pipe with horizontal outlets. Efficiency is achieved by reducing the area of intake of oil products and suspended solids from the neck of the tank, which leads to a decrease in the amount of sewage pumped out by the upper pipe.

The installation works as follows. With the help of an electric pumping unit, waste water with suspended solids and oil products enters the reservoir through a process pipeline and a collector. At the same time, air is supplied to the electric pumping unit by an ejector, which, together with waste water, enters the process pipeline, collector and then into the tank. Air bubbles, together with waste water, exit the collector holes. When rising in the tank, air bubbles take with them suspended solids, oil products and lift them into the upper layer of the liquid. The air pressure in the tank is reduced by a relief valve.

Further, to determine the level of water, oil products and suspended solids in the tank, the operator uses a meter rod and water sensitive paste. The measuring rod is lowered into the measuring hatch. The operator brings the liquid level to the neck of the tank and then turns off the electric pump unit. After that, the operator sets the length of the intake pipe using a tight swivel for a more accurate sampling of the volume of oil products and suspended solids.

Then, through the corresponding upper intake pipe with horizontal outlets, suspended solids and oil products with a top layer of water are pumped out of the tank. Subsequently, waste water is pumped out of the tank through a pipe.

The disadvantages of a pressure flotation plant for wastewater treatment at gas stations are:

1. Low efficiency of flotation, since air bubbles do not spread throughout the entire volume of the tank.

2. Lack of fastening of the flotator with the bottom of the tank.

Closest to this problem is a self-regulating flotation plant [Mingazetdinov I.Kh., Lisin R.A., Nurtdinov K.R. Patent for invention No. 2761527 dated December 9, 2021].

This device contains a housing with pipes for supplying contaminated water, discharging purified water, a flotation machine, a belt conveyor in the form of a spiral with a rotation drive, a foam collector, in which there is a tank with external floats inside the body. Inside the tank there is a belt spiral conveyor with a rotation drive and a foam removal device in the form of a truncated cone with a smaller base in the center of the spiral conveyor and a drain hood in the upper part, on the inner surface of which there are screw collars, under the belt transport There are blades on the common shaft, there are windows on the side walls of the tank, in front of which inclined reflectors are located inside the tank. In the lower part of the housing there is a flotator fixed with a support bracket to the bottom.

Self-regulating flotation plant operates as follows. The initial water contaminated with suspended solids begins to flow into the body space through the branch pipe. Water fills the entire space of the inner floating tank and the annular area between the hull and the tank. The hole in the wall of the floating tank ensures equalization of pressures in both cavities and the same water level. The presence of floats provides the tank, together with internal structural elements (spiral conveyor, conical cup, blades on the shaft), with positive buoyancy inside the body. Simultaneously with the supply of raw water, the air supply to the flotation machine, mounted on support brackets, is switched on through a branch pipe and a flexible hose, and the external drive begins to rotate the shaft. Together with the shaft, the spiral conveyor, conical cup and blades rotate. Air bubbles escaping from the openings of the skimmer begin to rise upward, carrying pollutant particles with them. The rotation of the blades provides a rotational movement of the rising air bubbles, which contributes to a more complete coverage of the entire volume of liquid inside the tank by the flotation process. The presence of reflective screens in front of the side holes eliminates the ingress of air bubbles into the space between the hull and the floating tank and no foam is formed under the float.

Foam and sludge, rising to the upper part of the floating tank, fall into the rotation zone of the spiral conveyor and enter the central part of the conveyor with spiral blades. From the central zone of the conveyor, the foam enters the conical cup. Further, the foam rises along the helical blades of the rotating conical glass to the upper part of the glass and enters the annular foam collector through the drain visor, from where it is removed through the nozzle. Purified water is discharged through a branch pipe connected to the space of the floating tank by a flexible element, and the intake hole is cleaned with a reflector, which prevents foam from entering the purified water. To prevent rotation of the floating tank and ensure only its vertical movement, there are grooves in the float, and clamps are made on the body. The vertical movement of the shaft and the provision of rotation is carried out from an external drive through the splines on the shaft, the movable element in the top cover. In the top cover there is a pipe for venting gases that are formed during the destruction of a certain part of the foam bubbles.

Some of the large contaminants that have not been subjected to the flotation process may settle to the lower bottom, from where it is removed through the nozzle during washing operations. In the event of a change in the flow rate of incoming contaminated water through the nozzle, the water level in the hull and in the internal floating tank may increase (or decrease). At the same time, the floats will ensure the rise (or lowering) of the internal floating tank in accordance with the change in water flow. The central shaft will either rise (or fall) in the calculated design range, the spline connection in the upper part of the shaft will provide a constant connection with the drive, and the lower part of the shaft will move freely along the central opening of the skimmer, respectively, up (or down). With all these oscillations, the spiral belt conveyor will constantly be in the foam sludge accumulation zone and the helical blades will continuously remove foam into the annular foam collector.

The skimmer in the said invention is made in the form of a hollow tubular torus (circle) connected to the central sleeve by means of six radial tubular elements. The torus and tubular radial elements have openings for air supply to the aquatic environment.

The skimmer is equipped with an air inlet with a flexible hose.

The flotation tank is made according to the dimensions of a cylindrical tank in order to cover its maximum volume with flotation. The working fluid in the flotator is air. The disadvantages of a self-regulating flotation plant are:

1. Not suitability of installation for horizontal steel tank.

2. Using the air inlet with a flexible hose, which may cause the flexible hose to break and fail.

3. High installation cost.

The proposed utility model allows solving the problem of increasing the efficiency of wastewater treatment at gas stations and oil depots when using horizontal steel tanks.

The solution of this problem is achieved by the fact that the flotator is equipped with a lower and upper circuits, rectangular in shape, connected to a collector with the possibility of passing water with air at the attachment points, while the lower circuit has a diametrical pipe section and is mounted on supports that are fixed on the bottom of the tank, the circuits are connected by pipe sections, and also by the fact that the circuits are located parallel to each other and the earth's surface, and the holes are located on top and side of the flotator.

These features are essential for solving the problem of the utility model, since the efficiency of the flotation process in a horizontal steel tank increases, the performance of suspended solids cleaning at the flotation stage throughout the entire volume of the CGM increases, and the energy intensity of the cleaning process decreases.

The essence of the utility model is explained in Fig. 1, fig. 2, fig. 3 showing a front view of a horizontal steel tank, a top view of a skimmer, and a front view of a skimmer with stands.

A horizontal steel tank 1 with spherical walls 2, having a neck 3, an inlet pipeline 4 with a valve 5 is equipped with a flotation 6 consisting of a lower 7 and upper 8 circuits. The skimmer is connected to the collector 9 with the possibility of supplying water with air (or air). The skimmer is equipped with holes 10, evenly spaced on the side and top. The lower contour is rigidly attached to supports 11, which are fixed to the bottom of the tank. The upper circuit is rigidly attached to the lower circuit with the help of pipe sections 12, with the possibility of water inflow with air. The lower contour of the flotator has a diametrical pipe section 13, which is connected to the collector. The reservoir is located on the earth's surface 14.

The upper and lower contours of the flotator are located at a distance of 10-20 cm from the walls of a horizontal steel tank at a certain height, which allows for the most efficient flotation throughout the entire volume of the CGM. The design of the flotator is in the lower contour the shape of a rectangle, in the center of which there is a diametrical pipe section. In the upper contour, the flotator design is a rectangle. This design avoids stagnant zones in the tank that are not subject to flotation.

The utility model works as follows. Air is supplied to the collector, which, together with waste water, enters the flotator 6 located in tank 1. Then the air with waste water enters the lower 7 and upper 8 circuits of the flotator. Air bubbles, together with waste water, exit holes 10 of the flotator 6. When rising in tank 1, air bubbles take with them suspended solids, oil products throughout the volume of the steel horizontal tank and lift them into the upper liquid layer.

After that, suspended solids and oil products with a top layer of water are pumped out of the tank through the corresponding upper intake pipe with horizontal outlets.

Preliminary pumping of oil products and suspended solids from the wastewater tank reduces the load on the fine filter, adsorption filter, increases productivity and reduces the energy intensity of the cleaning process. The amount of waste water pumped out together with oil products and suspended solids is also reduced.

Claims (1)

A flotation machine for a horizontal steel tank, including a flotation machine with side and top openings, supports, characterized in that the flotation device is equipped with a lower and upper rectangular contours, is connected to a collector with the possibility of passing water with air at the attachment points, while the lower circuit has a pipe section and is mounted on supports that are fixed to the bottom of the tank, the circuits are connected by pipe sections, and also by the fact that the circuits are located parallel to each other and the earth's surface, and the holes are located top and side of the skimmer.

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