CN101759343A - Concentration unit in sludge treatment - Google Patents

Abstract

The thickening device in the sludge treatment provided by the present invention is a circular tank body [5], and there is an isolation cylinder whose upper part is a filter screen cylinder [10] in the tank body, and the inside and outside of the isolation cylinder are respectively a drainage chamber [16] and a concentration zone [17], the isolation cylinder is installed on the rotating shaft of the mixer, and the paddle [4] is installed on the isolation cylinder through the paddle support plate [3], and there is also a scraper [7] in the concentration area through the scraper support rod [ 8] Installed on the tank wall, with flushing water pipe [9] installed in the drainage chamber, the working edge of the mud scraper and the water spray port of the flushing water pipe are opposite to each other inside and outside the filter screen cylinder and arranged on the entire height of the filter screen cylinder . Compared with the prior art, the present invention can guarantee the cooperative operation of the mud scraper and the flushing water pipe, so as to ensure the descaling effect on the filter screen, so that the concentration operation of the present invention will not be blocked due to the blockage of the filter screen or due to fouling. Stop production due to other reasons to ensure the continuity, effectiveness and stability of the concentration operation.

Description

Thickening device in sludge treatment

Technical Field The present invention relates to a thickening device in sludge treatment, which belongs to the technical field of sludge treatment in chemical metallurgy.

Background technology The sludge settled in the flocculated sewage treatment needs to be dehydrated to reduce the amount of final treatment such as landfill and sintering. Before the sludge is dewatered, the flocculated sewage must be concentrated to reduce the workload of the dehydration process and a large amount of equipment investment and consumption. In the past, sedimentation tanks and concentration tanks were widely used for the concentration of flocculated sewage. This exposes defects such as low efficiency, large floor space, and large engineering workload. Therefore, there is a Chinese utility model patent ZL 200820120162.9 "Flocc Thickening Device in Sludge Treatment" which proposes a kind of thickening device in sludge treatment with high efficiency and small footprint. Mixer. The outer ring of the tank is a jacket, that is to say, there is an isolation cylinder in the tank that divides it into two rings, the inside of the isolation tube is the concentration area, and the outside of the isolation tube is the drainage chamber. The concentration area is the upper cylindrical tube body and the conical bottom of the lower part, there is a concentrated mud outlet on the lower conical tip, and there is also an outlet in the lower part of the drainage chamber, which is the outlet of the filtered water. The upper part of the cylindrical part of the isolation cylinder is composed of grid bars The grating... There are stirring paddles in the enrichment area, and the stirring paddles... are vertically installed on two cantilevers intersecting in a cross, and the cantilevers are perpendicular to the stirring shaft". However, there are some defects in the thickening device in the sludge treatment of this structure, such as the removal of the sludge pasted on the screen is very inconvenient, which reduces the operating speed and even needs to be shut down for cleaning, which in turn affects the stability of the entire flocculated sewage treatment consistency, continuity and efficiency. Because during the concentration process, the flocculated sewage (a mixture of sludge aggregates and water) enters the outer ring of the tank, and the water enters the inner ring of the tank through the filter screen, and some impurities such as flocs and hairs are blocked in the filter of the filter screen cylinder. online. As time goes on, the thickness of the blocked flocs and sundries will gradually increase, which will reduce the permeable area, and finally until they are completely blocked or the flocs are destroyed and dispersed, and also enter the drainage cavity with water, thereby reducing concentration. efficiency. Although as disclosed in the Chinese utility model patent ZL200820120139.X "Anti-scaling structure in sludge treatment equipment", "the surface in sludge treatment equipment that is in contact with sludge is coated with a layer of fluorine paint." can be largely Prevent fouling on the grating, but this coating is easier to be stripped during sludge treatment, and it can't offset the entanglement of some long debris.

Summary of the invention In view of the above-mentioned defects, the technical problem to be solved by the present invention is to equip the thickening device with a structure capable of descaling and descaling the filter screen during operation, so as to provide an efficient, stable and continuous process for sludge treatment. The thickening device in sludge treatment provides good conditions for the sludge dehydration process.

The thickening device in the sludge treatment provided by the present invention is a circular tank body, and there is an isolation cylinder in the tank body, and the isolation cylinder separates the tank body into an inner and outer coaxial drainage cavity and a concentration area, and the upper part of the isolation cylinder is a circular filter. The isolation cylinder has a conical bottom, a mixer is installed on the tank body, a stirring paddle is installed in the concentration zone and there is an upper end of the flocculated sewage inlet and a lower end of the concentrated mud outlet, and the lower end of the drainage chamber has a filtered water outlet, wherein the drainage chamber Inside the isolation cylinder, the concentration zone is outside the isolation cylinder. The isolation cylinder is installed on the shaft of the mixer. The stirring paddle is composed of paddles installed on the isolation cylinder through the paddle support plate. There is also a filter cylinder in the concentration zone for scraping mud. The plate is fixed and installed on the tank wall through the support rod of the mud scraper. The mud scraper is between the paddle and the wall of the filter screen cylinder. The working edge of the plate and the water spray opening of the flushing water pipe are opposite to each other inside and outside the filter screen cylinder and arranged on the entire height of the filter screen cylinder.

The thickening device in the sludge treatment provided by the present invention uses a mixer to drive the isolation cylinder and the stirring paddle, and the thickening area is set inside the outer drainage chamber, so that the scraper can be fixedly installed on the tank wall to scrape the filter screen cylinder. Mud operation. The water spray port on the flushing water pipe and the working edge of the mud scraper are separated from the inside and outside of the filter screen and work on the filter screen at the same time, so that when the working edge of the mud scraper scrapes on the outer surface of the filter screen, there will be flushing water on the other side of the filter screen Fitting from the inside out, loosened buildup falls off. Compared with the prior art, the present invention can guarantee the cooperative operation of the mud scraper and the flushing water pipe, thereby ensuring the descaling effect on the filter screen, so that the concentration operation of the present invention will not be blocked by the filter screen or due to fouling. Stop production due to other reasons to ensure the continuity, effectiveness and stability of the concentration operation.

The mud scraper is composed of a plurality of spring steel sheets installed on a mud scraper rod. Each spring steel sheet has an included angle relative to the horizontal plane and one side is close to the wall of the filter screen cylinder. The close side is the working side. , the whole height of the filter screen cylinder has the working edge of the mud scraper and the wall of the filter cylinder, and there is a staggered part between two adjacent spring steel sheets, that is, the junction of two adjacent spring steel sheets pass through the same horizontal plane at the same time. A spring steel sheet can also be called a mud scraper. The scraper composed of multiple spring steel sheets makes it have enough elasticity and strength to ensure that its working side can continuously scrape off and adsorb on the scraper during long-term continuous work. Impurities on the surface of the filter cylinder wall; and the staggering of adjacent places and the working edge on the full height of the filter cylinder ensure that the entire surface of the filter cylinder wall is affected by the scraper.

In order to ensure the scraping effect and the life of the scraper, the tangential angle between the scraper and the surface of the net bucket can be controlled, the contact area between the scraper and the net bucket can be increased, the normal pressure can be reduced to reduce friction, and the speed of the net bucket can be controlled at the same time. to reduce its wear and tear.

The filter cylinder is spliced in parallel by steel bars with trapezoidal cross-section. There is a gap of 0.15-0.7mm width between the two steel bars. The barrel is constructed of steel bars of trapezoidal section welded vertically to horizontal support rings. The width is selected according to the nature of the sludge. Adopting such a structure not only effectively prevents impurities such as flocs from entering the filtered water, but also increases the filtering area of the filter screen to improve the concentration efficiency.

The agitating paddle is divided into an upper agitating paddle and a lower agitating paddle, which are respectively composed of the paddle support plate on the top of the isolation cylinder and the straight cylinder below the filter screen tube and the connected paddles. Pass through the gap of the mud scraper support rod; the upper and lower stirring blades have an inclination angle of 20-45° with the busbar of the tank body, and they are inclined from front to back according to the direction of rotation from top to bottom. This structure makes the flocculation The flocculation and impurities are subjected to a pressure in the thickening zone, and while the flocs and impurities are scraped off by the scraper, they can be smoothly discharged from the thickened mud outlet to ensure the thickening effect.

The upper part of the isolation cylinder is installed on the rotating shaft of the mixer, and the tip of the lower conical bottom is installed in the center of the bottom of the tank through the shaft. The shaft is a hollow shaft, and the flushing water pipe passes through the hollow shaft and enters the drainage cavity. The water pipe still communicates with the filtered water outlet channel outside the drain cavity and the tank.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic structural diagram of an embodiment of the present invention, in which: 1-reduction motor, 2-head, 3-blade support plate, 4-stirring blade, 5-tank body, 6-scraping mud Rod, 7- mud scraper, 8- mud scraper support rod, 9- flushing water pipe, 10- filter screen cylinder, 11- lower part of isolation cylinder, 12- filter water outlet, 13- flushing water inlet, 14- axle seat, 15-concentrated mud outlet, 16-drainage chamber, 17-concentrated area, 18-flocculated sewage inlet;

Figure 2 is an enlarged view of the I area in Figure 1, in the figure: 3-blade support plate, 4-stirring blade, 5-tank, 6-scraper rod, 7-scraper plate, 8-scraper rod support Rod, 9-washing water pipe, 10-filter screen cylinder, 11-isolation cylinder bottom;

Fig. 3 is an axial sectional view (partial) of the element 10 in Fig. 1 - the screen bucket.

DETAILED DESCRIPTION As shown in Figures 1 and 2, there is a tank body 5 with an elliptical head 2 on the upper and lower sides, and a reduction motor 1 is installed on the top of the upper head. There is an isolation cylinder inside the tank. The isolation cylinder includes a circular cylinder and a conical bottom. The upper part of the circular cylinder is a filter cylinder 10, and the lower part 11 of the isolation cylinder below the filter cylinder is a non-porous plate that really isolates the inside and outside. Composed, the inside and outside of the isolation cylinder are respectively a drainage cavity 16 and a concentration zone 17. The upper end of the filter screen cylinder is installed on the output shaft of the geared motor, and the tip of the lower conical bottom is installed on the lower head central shaft seat 14 of the tank body with an axis. Simultaneously, the upper end of the filter screen tube and the following parts of the filter screen tube are respectively fixed with stirring paddle support plates 3, and the upper and lower stirring paddles 4 are welded on the paddle support plates and other connecting plates are connected with the rotating shaft of the isolation tube, so that The original stirring paddle is connected with the output shaft of the reduction motor as the resale shaft of the mixer. The stirring blade is in the shape of a spiral ribbon, and the included angle between it and the busbar of the isolating cylinder where it is located is kept between 20° and 45°, and it is tilted forward, upward, backward, and downward according to the rotation direction of the mixer shaft. There is a gap between the planes where the ends of the upper and lower stirring blades are located, and a mud scraper support rod 8 passes through the gap to install the mud scraper 6 on the tank wall. The scraper rod is parallel to the axis of the filter cylinder, and a plurality of scrapers 7 are installed on it. The scrapers are parallel to each other and form an angle with the horizontal plane. The projection height of each scraper on the vertical plane is greater than that of two adjacent scrapers. The height difference between the two adjacent mud scrapers is staggered. The mud scraper is made of spring steel sheet. With the support of the mud scraper support rod, the working side of the mud scraper is close to the filter net. The mud scraper support rod is connected with the tank wall by a screw structure, so that it can be adjusted The actual length is the pressure of the working side on the filter. The tank body has a tangential flocculated sewage inlet 18 at the upper end of the concentration zone, and a concentrated mud outlet 15 at the bottom of the lower head. The shaft that installs the isolation cylinder on the lower head is a hollow shaft, and the lower end of the hollow shaft is a three-way structure. A flushing water pipe 9 is inserted into the drainage cavity from the axial passage of the hollow shaft, and the bottom end is sealed to form a flushing water inlet 13. The bypass of tee is water filter outlet 12. The flushing water pipe enters the drainage chamber according to the axis and then turns horizontally. The turned flushing water pipe is on the same elevation as the mud scraper support rod. The end of the horizontal flushing water pipe is installed with a vertical flushing water pipe through a three-way structure. The vertical flushing water pipe is provided with a water spray port on one side directed to the wall of the filter screen cylinder. Make the water jet face the working side of the mud scraper through the filter screen. The filter screen is composed of steel bars with trapezoidal cross-section welded vertically and parallel to the support ring. As shown in Figure 3, the long bottom of the trapezoidal cross-section is inside the outer short bottom. ~0.7. Make sludge agglomeration or sundries not solid in the gap of the filter screen.

During operation, the deceleration motor drives the isolation cylinder of the filter cylinder and the upper and lower stirring paddles to rotate. Sludge enters tangentially from the upper part along the direction of rotation, and under the action of the rotation of the stirring blades, the flocculated sewage forms a spiral downward flow state in the tank. While the flocculated sewage spirals downward, the liquid phase enters the drainage cavity through the filter screen cylinder and is discharged from the filter water outlet. On the surface of the filter net, the mud scraper continuously scrapes off the flocs and impurities adsorbed on the surface of the net barrel. At the same time, the inner side of the filter screen is facing the mud scraper flushing pipe water nozzle to continuously wash the filter screen to remove impurities remaining in the gaps of the filter screen to ensure its water permeable area, so as to prevent the water flow rate from being reduced due to the decrease of the water permeable area. Too fast to destroy the flocs and cause the broken flocs to enter the drainage cavity.

Since the whole enrichment device is sealed for the benefit of environmental protection, a pressure gauge and an exhaust valve are installed on the head of the tank body to ensure safe operation. When the sludge starts to enter the tank after the device is started, open the exhaust valve to discharge the air to ensure that there is a certain amount of sludge and filtered water in the tank. During work, you can observe the value change of the pressure gauge, and when the pressure is abnormal, you can decompress it through the exhaust valve. At the same time, the height difference between the sludge liquid level and the filtrate liquid level can be achieved by adjusting the filtered water discharge volume and the sludge treatment volume, so that there is enough filter head.

This example is a relatively perfect and practical solution, but it does not mean that all technical features are necessary or irreplaceable, that is, under the guidance of the technical content disclosed in the present invention and the prior art content, several different implementations can be proposed plan.

Claims (6)

1. the concentrating unit in the sludge treatment, it is a circular tank, one isolating cylinder is arranged in the tank body, isolating cylinder is divided into inside and outside co-axial drain chamber and enrichment region with tank body, isolating cylinder top is circular filtering net cylinder, isolating cylinder has conical bottom, stirrer is installed on the tank body, stirring rake is installed in the enrichment region and exporting through the sewage import of flocculation and the concentrated mud of lower end of upper end arranged, there is the drainage outlet drain chamber lower end, it is characterized in that drain chamber is within isolating cylinder, enrichment region is outside isolating cylinder, isolating cylinder is installed in the stirrer rotating shaft, stirring rake is installed on the isolating cylinder through the blade back up pad by blade and constitutes, and also has the cleaning shoe of filtering net cylinder to be fixedly mounted on the tank wall through the cleaning shoe support bar in the enrichment region, and cleaning shoe is between blade and filtering net barrel, have wash tub pipe to pass isolating cylinder lower shaft hole and in sealing is installed in drain chamber, the working edge of cleaning shoe and the water jet of wash tub pipe are relative inside and outside the filtering net cylinder and be arranged on the whole height of filtering net cylinder.

2. the concentrating unit in the sludge treatment as claimed in claim 1, it is characterized in that said cleaning shoe is that a plurality of spring steel plates are installed on the mud scraping rod, the relative horizontal plane of each spring steel plate has an angle and has one side to be close on the filtering net barrel, this limit of being close to is a working edge, all there is the working edge of cleaning shoe to be close to mutually on the whole height of filtering net cylinder with the filtration barrel, between adjacent two spring steel plates staggered part is arranged, the intersection of two promptly adjacent spring steel plates is to pass through same horizontal plane simultaneously.

3. the concentrating unit in the sludge treatment as claimed in claim 1, it is characterized in that said filtering net cylinder is that steel bar by the trapezoid cross section is spliced abreast, the slit that 0.15～0.7mm width is arranged between two steel bars, the degree limit that lack outside on long base in the trapezoid cross section is interior.

4. the concentrating unit in the sludge treatment as claimed in claim 3 is characterized in that filtering net cylinder is that steel bar with the trapezoid cross section vertically is welded on the support annulus of level and constitutes.

5. the concentrating unit in the sludge treatment as claimed in claim 1, it is characterized in that said stirring rake is divided into stirring rake and lower stirring paddle, constitute with blade back up pad on the straight tube in lower section and the blade that is connected thereof with filtering net cylinder by the isolating cylinder top respectively, between the last lower stirring paddle blade tips neutral gear that passes the cleaning shoe support bar is arranged; Last lower stirring paddle blade respectively has and becomes 20～45 ° inclination angle with the tank body bus, and is to recede by sense of rotation from top to bottom in the past.

6. the concentrating unit in the sludge treatment as claimed in claim 1, it is characterized in that said isolating cylinder top is installed in the stirrer rotating shaft, tip at the bottom of the lower cone shape is installed in the tank base center through axle, this axle is a quill shaft, wash tub pipe passes from this hollow and enters drain chamber, still links up a drain chamber and a jar outer drainage exit passageway between this quill shaft and the wash tub pipe.

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