RU2061558C1 - Method and device for filtering solutions or liquid media with hard impurities - Google Patents

Abstract

FIELD: petroleum, mining industries. SUBSTANCE: raw material is fed to steep sloping portion of filtering sieve having the shape of blade line in longitudinal section perpendicularly to steep sloping portion by means of hydrodynamic screen in the form of bent plate disposed opposite the steep sloping portion. Hydrodynamic screen of device is fastened on housing rigidly or cantilevered on terminal portion which is disposed parallel to gently sloping sieve portion following the steep sloping one and creates additional pressure on material on gently sloping portion. When material is displaced along sieve it is periodically subjected to aggregation and disaggregation with simultaneous drying. Large-sized impurities are picked and are taken aside from purified liquid medium. EFFECT: enhanced efficiency. 5 cl, 6 dwg

Description

 The invention relates to equipment for cleaning mechanical impurities of various suspensions and emulsions and can be used in the mining industry, for example, when drilling wells for oil, gas, water and other minerals, food and chemical industries, in the field of production of building materials, etc. industries.

 In our country and near and far abroad countries, horizontal or inclined vibration screens are widely used.

 The closest in purpose and combination of features to the proposed invention is a device for filtering liquid media or solutions with solid impurities, including a housing mounted on the frame with a vibrator and spring supports, a filter sieve located in the housing, a receiving manifold for supplying source material / 4 /, which implements an appropriate method of filtering liquid media, including the separation on a sieve of solid impurities and purified liquid medium under the action of vibrational forces and gravity.

The main disadvantages of the known method and device are:
poor cleaning quality and throughput of the sieve due to the fact that the horizontal location of the mesh leads to its inevitable clogging by particles of sludge. The sludge particles and the solution move with acceleration of the vibrocasing along the sieve and with the acceleration of gravity g pass through the sieve, detach from the mesh and, when they meet, are subjected to a “frontal” impact, which speeds up the process of clogging the mesh with sludge and reduces its service life and throughput,
large overall dimensions, weight, material consumption, laboriousness of manufacturing a sieve.

high drive power
high windage of the mesh reduces its service life,
high gas contamination near the sieve in the event of a carbonated solution,
increased moisture discharged sludge.

 Achievable technical result is to improve the quality of cleaning liquid media, increase the specific throughput and service life of the mesh, reduce the weight, overall dimensions, laboriousness of manufacture while simplifying the design, reducing the moisture content of the sludge, ensuring an economically clean environment.

 The specified technical result is achieved by the fact that the source material is fed to a steeply inclined section of a filter screen having the shape of a broken line in a longitudinal section perpendicular to the steeply inclined section, and in the subsequent shallow section, the material to be separated is subjected to additional pressure by means of resonating or antiphase vibrations of the hydrodynamic screen and the casing with the sieve, while in the process of transporting material along the sieve periodically carry out aggregation and disaggregation of the material from one its drying belt, the shared material may be subjected to oscillatory directed at an angle to the longitudinal axis of the sieve.

 In FIG. 1-6 shows a device for implementing the method: FIG. 1 is a longitudinal section, FIG. 2 is a plan view, FIG. 3 is a section B-B of FIG. 2, FIGS.

 A device for filtering liquid media or solutions with solid impurities consists of a frame 1 with a receiving manifold 2 mounted on it and an inlet pipe 3 and a solution flow distributor 4, which is attached by clamping screws 5. A rectangular vibrocasing 7 is mounted on the frame 1 on four spring supports 6, in which perpendicular to the direction of flow of the fluid flow, rotating rollers 8-12 are installed at different heights and distances between each other, the sieve or mesh 13 alternately bends around them from above and below, taking in the form omani pine. The distance between the rollers is chosen so that the windage of the mesh 13 is practically reduced to zero, it is always in a pressed state to them. This allows you to significantly increase the frequency of oscillations / from 19 to 25 Hz or more / and the service life of the grid. Changing the location and number of rollers 8-12, you can give the grid any configuration with the formation of zones of aggregation, disaggregation, drying and transportation of sludge.

 The ends of the mesh are pressed by special grippers 14 and 15, the design of which can be very diverse. In this case, the rear gripper 14 is made in the form of two plates with rubber gaskets and tightening screws, the front 15 in the form of a pressure bar made of a pipe cut into a generatrix.

 For its clamping to the roller 12 are the screws 16.

 The final tension of the mesh is achieved by a roller 17, which performs a translational motion with the help of screws 18.

 The latter rotate in the bushings of the shaft 19, which is mounted with screws 20 and can rotate on them as around an axis.

 A rotary beam 23 is attached to the posts 21 with screws 22, with which the plate 24 is rigidly connected to the vibrator 25. To create a supply of mesh along the length, a rotary drum 26 is attached to the front of the frame 1.

 A hydrodynamic screen 27 is installed under the flow distributor 4 on the discharge side of the housing in the form of a curved plate fixed to the housing either rigidly or cantilever at the end section, which is located opposite the loading steeply inclined section 13 of the sieve, parallel to the subsequent gently sloping section.

 To exhaust gases, part of the frame 1 is covered by a plate 28, which together with the channel of the frame forms a gas outlet channel with holes 29 and nozzles 30.

The vibrator 25 on the plate 24 can be installed in two positions:
first, when the vibrator 25 / or two vibrators / is located perpendicular to the direction of flow of the solution, in the case of installing two vibrators, the sieve operates in a linear mode,
second, when the vibrator 25 is located along the direction of motion of the solution flow.

 The implementation of the method and the operation of the device is as follows.

 The solution from the well with slurry through the receiving pipe 3, the collector 2 and the flow distributor 4 enters the hydrodynamic screen 27 and is directed by gravity to the steeply falling section of the grid 13, where the process of filtering the liquid phase begins. Since the dead weight of particles / mechanical impurities / is directed almost parallel to the filtering surface of the mesh, this contributes to their rapid movement down and self-cleaning of the mesh simultaneously with the separation of the material.

 Next, a sludge particle with the remaining volume of the liquid phase, under the influence of its own weight and vibration, settles along the entire length of the roller 9. Here, in the cramped conditions, the process of particle aggregation begins to occur intensively, when on the surface of large particles, smaller mesh with a mesh size smaller.

 This process proceeds along the entire length of the filtration zone of the liquid phase and contributes to an increase in the efficiency of cleaning solutions.

 The remaining volume of the solution with the particles of sludge, which are mostly in the aggregative state, enters the gently sloping section of the net between the rollers 9 and 10, filling the entire volume under the hydrodynamic screen 27. Moving progressively due to the influence of vibrations and the difference in hydrostatic pressure at the beginning and end of the hollow section , the volume of the solution additionally receives accelerations with which the hydrodynamic screen 27 / more than 5 g / vibrates, while in all existing screens the solution moves only from top to bottom acceleration / free-fall in the air /.

 Due to this, the pressure drop across the screen surface increases, which dramatically increases the rate of filtration of the liquid phase.

 The hydrodynamic screen 27 performs synchronous oscillations in the case of its rigid attachment to the vibrocasing 7 and in antiphase, when its gentle consular section is free. In the latter case, the hydrodynamic effect increases, which is necessary in the case of cleaning solutions with high rheological parameters and density.

 Having reached the highest overflow line, i.e. the sludge roller 10, which is already in an aggregative state with the remaining volume of the liquid phase, is poured onto the next grid section at the location of the tension roller 17. The latter is located so that the first section has a rather significant slope. Therefore, almost complete separation of the majority of the liquid phase from the solution takes place, and the sludge, grinding, nevertheless remains in the aggregative state and moves at a steeply falling section of the mesh at a considerable speed, gathers along the tension roller 17, where the process of its aggregation and drying is also intensively taking place. In subsequent sections of the sieve surface, its maximum possible drying and transportation to a sludge collector or barn takes place.

 Thus, the process of cleaning the solution from sludge ends.

 In the event of a carbonated solution, the pipe 30 is connected by a hose to a fan or a vacuum system. In this case, the gas released from the solution when cleaning it on a vibrating screen continues to move down due to rarefaction (this is also facilitated by the fact that it is heavier than air / and through the openings 29 in the frame 1 the exhaust 30 is removed by a fan / in Fig. not shown / transported outside the work area to a safe place. Thus, the use of a bulky exhaust system with umbrellas and air ducts is excluded and an environmentally friendly environment in the working area is guaranteed.

 In the case of installation on the plate 24 of two vibrators 25, and the unbalances of the latter rotate in different directions, the vibrocasing 7 performs linear oscillations.

 In the second case, when the vibrator is installed along the direction of movement of the solution and at an angle to the horizontal plane, the process of cleaning the solution from solids proceeds in a completely different way. Vibrocasing 7 vibrates along an elliptical / circular / trajectory, the plane of which is perpendicular to the direction of movement of the solution and at an angle to the horizontal plane. The solution, arriving alternately at different sections of the grid, is subjected to separation of the liquid phase, as in the first case described. However, the sludge particle moves not only translationally in the direction of fluid movement, but also from the side walls of the vibrating casing towards the center line. Thus, we have two sludge streams moving towards each other from the side walls of the vibrocasing 7. After they meet, they merge into a common stream moving along a helical path, undergoing disaggregation at the points of upper inflection and aggregation at the lower. Ceteris paribus, the particle transport path increases significantly, therefore, the process of particle aggregation at the extreme lower points proceeds more intensively due to lateral displacement of the sludge particle stream, i.e. the most optimal conditions for their aggregation and drying are created.

 Installation and change of the grid is as follows.

 The mesh of the required length is wound on the drum 26. The free end of the mesh 13 is laid between the rollers 8-12, as shown in figure 1 and clamped by the clamping bar 14. With the drum 26, select the slack of the mesh 13 until it is pre-tensioned, and the screws 16 and the strap 15 fix its position. By rotating the drum 26 in the opposite direction, leave a portion of the mesh between the drum 26 and the pressure bar 15 in a free state.

 The final tension is achieved by lowering the roller 17 with screws 18. The sieve is ready for use. As wear and tear, part of the net is thrown out due to its existing supply on drum 26. NUY2 NUY4

Claims (5)

 1. A method of filtering liquid media or solutions with solid impurities, comprising supplying the starting material to a filter sieve located in the vibrocasing, separating the solid impurities under the influence of gravity and vibration, and the subsequent separate removal of the purified liquid medium and solid impurities, characterized in that the starting material is fed on a steeply inclined section of the filter sieve, perpendicular to the last and on the subsequent shallow section, the material to be separated is subjected to additional pressure by cutting iruyuschih or antiphase vibrations and hydrodynamic screen housing with a screen, while in the process of conveying the material along the sieve are periodically performed aggregation and disaggregation of the material by drying it simultaneously.  2. The method according to p. 1, characterized in that the shared material is subjected to vibrations, directed at an angle to the longitudinal axis of the sieve.  3. A device for filtering a liquid medium or solutions with solid impurities, including a housing mounted on the frame with a vibrator and spring supports, a filter screen located in the housing, a receiving manifold for supplying source material, located on the loading side of the housing, characterized in that the receiving manifold is made with a feed flow distributor, the sieve is equipped with rollers mounted in the housing perpendicular to its longitudinal axis with offset relative to each other at the height and length of the housing, and a hydrodynamic screen in the form of a curved plate, and the filter screen is stretched on the rollers with the formation in the longitudinal section of a broken line with a loading steeply inclined section and subsequent gentle, and the hydrodynamic screen is installed under the flow distributor, fixed to the housing rigidly or cantilever at the end section, which is located opposite the loading section steeply inclined section of the sieve and parallel to the subsequent flat section, while the vibrator is mounted on the housing from its discharge side at an angle to the horizon total plane, along or across the longitudinal axis of the body.  4. The device according to p. 3, characterized in that it is equipped with a device for pre-tensioning, winding and bypass sieve in the form of a drum.  5. The device according to p. 3, characterized in that the frame is made with holes and an air duct with a pipe for removing gases.

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