CN221701353U - A spiral extrusion belt filter press - Google Patents

Abstract

The utility model discloses a spiral extrusion belt filter press, comprising a frame and a spiral extrusion device, a filter belt filtering device, a power device and a tail water collecting device arranged on the frame. The spiral extrusion device comprises an inner cylinder, an outer cylinder, a spiral shaft and spiral blades; the filter belt filtering device further squeezes the sludge under the action of the power device until it is discharged; the tail water collecting device collects the water squeezed out by the spiral extrusion device and the filter belt filtering device and discharges it. The utility model dehydrates the mud quickly under the pressure of the inner cylinder and the spiral blades, and then the dehydrated mud cake is pushed out of the inner cylinder by the rotating blades and falls into the filter belt filtering device, and continues to be dehydrated under the squeezing action of the filter belt and the roller. Compared with the traditional extrusion belt filter press, the filtration efficiency is higher, the water content of the obtained mud cake is lower, and the subsequent transportation and utilization are convenient.

Description

A spiral extrusion belt filter press

Technical Field

The utility model relates to a filter press in the field of dehydration equipment, in particular to a spiral extrusion belt filter press.

Background Art

The belt filter press is a highly efficient sludge dewatering and fine industrial material solid-liquid separation equipment. Due to its simple structure, safe and reliable operation, low energy consumption, low noise, large processing capacity, and continuous operation, it has been rapidly promoted and applied in the fields of chemical industry, papermaking, coal, environmental protection, etc. in recent years. However, with the progress of science and technology and the development of production, some performance indicators of the belt filter press are increasingly unable to meet the needs of production development. Although in recent years, relevant experts and manufacturers at home and abroad have made some improvements and optimizations to the structure of the belt filter press, such as adjusting the size and structural layout of the extrusion dewatering roller system, increasing the gravity dewatering area, and increasing the high-pressure extrusion dewatering area, the extrusion effect of the belt filter press has not been significantly improved. For example, the moisture content of the mud cake cannot be further reduced, resulting in increased difficulty and cost of mud cake transportation.

The traditional belt filter press mainly removes most of the free water under the action of gravity, and then the sludge enters the wedge-shaped pre-pressing section. In this stage, the sludge is flattened on the one hand, and slightly squeezed on the other hand. The sludge is gradually compressed and dehydrated, preparing for the subsequent extrusion and dehydration; then, the sludge enters the S-shaped extrusion and dehydration section, in which the sludge is sandwiched between the upper and lower filter screens, and is repeatedly squeezed and sheared and dehydrated by several rollers from large to small, so that the sludge forms a filter cake. Finally, the filter cake is unloaded through the unloading device. The filter belt of the unloading filter cake is cleaned by the automatic cleaning device and then participates in a new working cycle, completing the entire sludge dehydration work.

Through on-site investigation, it was found that the dehydration effect of the gravity section of the belt filter press was not good, the moisture content of the final mud cake was generally high, and there were problems such as mud leakage and filter belt sticking during the extrusion process. At present, the improvement of the gravity section mainly integrates a vacuum re-pressurization device or extends the gravity section, etc. The free water discharge of the gravity section has increased to a certain extent, but the effect is not significant. In addition, the gravity section occupies a large area, which is not convenient for equipment transportation.

Utility Model Content

The utility model aims to overcome the shortcomings of the existing belt filter press and provide a spiral extrusion belt filter press which occupies a small area and can effectively reduce the moisture content of sludge.

To this end, the utility model adopts the following technical solutions:

A spiral extrusion belt filter press comprises a frame 1 and a spiral extrusion device, a filter belt filtering device, a power device and a tail water collecting device arranged on the frame 1, wherein:

The screw extrusion device is installed obliquely, and includes a screw shaft 14 and a coaxially arranged inner cylinder 16 with openings at both ends and an outer cylinder 17 with closed ends. The length of the inner cylinder is adapted to the inner length of the outer cylinder, and the outer cylinder 17 is sleeved outside the inner cylinder 16.

An upper hopper 2 is arranged on the lower side of the screw extrusion device, and the sludge is put into the inner cylinder through the upper hopper 2; the upper hopper 2 is 80-100 cm long and 60-80 cm wide.

A discharge chute 12 is provided on the higher side of the screw extruder for discharging the sludge extruded in the inner cylinder 16;

The diameter of the inner cylinder 16 gradually decreases along the sludge conveying direction, and the diameter of the end close to the discharge chute 12 is smaller. A plurality of drainage holes 18 are provided on the side wall of the inner cylinder 16 .

The inner cylinder 16 rotates clockwise under the action of the power device; a plurality of brush fixing rings 20 are installed at intervals on the inner wall of the outer cylinder 17, and a plurality of strip brushes extending along the sludge conveying direction are also arranged between the inner cylinder and the outer cylinder. The strip brushes are fixed on the brush fixing ring 20 for cleaning the drainage hole 18.

The spiral shaft 14 is provided with a spiral blade 15 whose diameter is adapted to the inner diameter of the inner cylinder 16. The spiral shaft 14 rotates counterclockwise, and the squeezed sludge falls into the filter belt filtering device through the discharge trough 12. A drain port 13 is also provided at the bottom of the lower end of the outer cylinder 17. The diameter of the spiral shaft 14 is 2-3 cm, the pitch is 75-125 cm, and the rotation speed is 5-10 rpm.

The opening diameter at one end of the inner cylinder 16 is 2-2.5m, and the opening diameter at the other end is 1.5-2m. The central axis of the inner cylinder 16 is at an angle of 20-30° to the horizontal plane. The rotation direction is opposite to that of the spiral shaft. The rotation speed is 3-5 rpm. The hole spacing of the drainage holes 18 is 2-3cm, and the hole diameter is 2-3mm. The hole diameter gradually increases from the lower end to the higher end.

The outer cylinder 17 has a diameter of 2.1-2.6m at one end and a diameter of 1.6-2.1m at the other end, and a length of 4.5-5.5m. The outer cylinder 17 has the same inclination angle as the inner cylinder 16, and the spacing between the inner and outer cylinders is 10-15cm. The discharge chute 12 has a length of 300-350cm and a width of 20-40cm. The drain outlet 13 has a length of 40-50cm and a width of 40-50cm.

The filter belt filter device further squeezes the sludge under the action of the power device until it is discharged.

The filter belt filtration device includes seven dewatering rollers 6 of different diameters fixed on the frame 1, a discharge roller 7, a transmission roller 8, two steering rollers 5, four support rollers 4 and two filter belts. The transmission roller 8 drives the other rollers to rotate through the filter belt under the action of the power device. The filter belt is in close contact with the roller. When the roller rolls, the roller and the filter belt produce a compressive force on the sludge. The filter belt filtration device also includes two flushing nozzles 9 for flushing the filter belt after discharge. Among the dewatering rollers 6, the larger diameter is 100-120cm, the smaller dewatering roller 6 has a diameter of 20-30cm, the discharge roller 7 has a diameter of 30-45cm, the transmission roller 8 has a diameter of 50-60cm, the steering roller 5 has a diameter of 20-30cm, and the support roller 4 has a diameter of 20-30cm.

The tail water collection device collects and discharges the water squeezed out by the spiral extrusion device and the filter belt filtration device. The tail water collection device consists of a No. 1 water collection tank 10, a No. 2 water collection tank 11 and a drainage port, which are respectively arranged on the side bottom walls of the No. 1 water collection tank 10 and the No. 2 water collection tank 11. The water squeezed out by the spiral extrusion device and the filter belt filtration device converges in the No. 1 water collection tank 10 and the No. 2 water collection tank 11 and is discharged from the drainage port. The No. 1 water collection tank 10 collects the tail water of the spiral extrusion device, with a length of 6.5-7m, a width of 4-4.5m, and a depth of 1-1.5m. The No. 2 water collection tank 11 collects the tail water of the filter belt filtration device, with a length of 6.5-7m, a width of 4-4.5m, and a depth of 1-1.5m. The side bottom walls of the two water collection tanks are provided with drainage ports with a diameter of 20-30cm, and the lower edge of the drainage port is 3-5cm away from the bottom of the water collection tank.

Compared with the existing belt filter press, the utility model has the following beneficial effects:

1. The spiral extrusion belt filter press of the utility model does not require a gravity dehydration section, the overall length of the equipment is shorter, the floor space is smaller, and transportation is convenient.

2. The screw extrusion device of the utility model produces a mud cake with lower moisture content through rotating centrifugal action and extrusion action, which is 20-25% lower than that of the prior art, and has higher dehydration efficiency.

3. The spiral extrusion belt filter press of the utility model saves flushing water, reduces the workload of water treatment, and can also classify, collect and dispose of tail water, so as to facilitate the efficient recycling of tail water.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 is a schematic diagram of the overall structure of the utility model;

FIG2 is a schematic diagram showing the positional relationship between the spiral shaft and the spiral blades in the filter press of the present invention;

FIG3 is a schematic diagram showing the positional relationship between the inner cylinder and the outer cylinder in the filter press of the present invention;

FIG4 is a schematic diagram of the structure of the outer cylinder;

In the figure:

1. Frame 2. Upper hopper 3. Screw dehydrator 4. Support roller 5. Steering roller

6. Dewatering roller 7. Discharge roller 8. Transmission roller 9. Flushing nozzle 10. No. 1 water collection tank

11, No. 2 water collection tank 12, discharge chute 13, drain port 14, spiral shaft 15, spiral blade

16, inner cylinder 17, outer cylinder 18, drainage hole 19, brush 20, brush fixing ring.

DETAILED DESCRIPTION

The technical solution of the utility model is further described in detail below in conjunction with the accompanying drawings and embodiments.

1 to 4 , the spiral extrusion belt filter press of the utility model comprises: a spiral extrusion device, a filter belt filtering device, a power device and a tail water collecting device. The spiral extrusion device, the filter belt filtering device, the power device and the tail water collecting device are all arranged on a frame 1 .

The spiral extrusion device includes an inlet hopper 2, a spiral dehydrator 3, a discharge chute 12 and a drain port 13. The spiral dehydrator 3 includes a spiral shaft 14, a spiral blade 15, an inner cylinder 16 and an outer cylinder 17. Drain holes 18 are evenly distributed on the surface of the inner cylinder at equal distances. The outer cylinder 17 is sleeved on the outside of the inner cylinder 16. The inner cylinder has openings at both ends and the outer cylinder has closed ends. The length of the inner cylinder is adapted to the internal length of the outer cylinder. The sludge is put into the inner cylinder through the upper hopper 2. The extruded sludge is discharged from the outer cylinder through the discharge chute 12. A plurality of brush fixing rings 20 are installed at intervals on the inner wall of the outer cylinder 17. A plurality of strip brushes extending along the sludge conveying direction are also arranged between the inner cylinder and the outer cylinder. The strip brushes are fixed on the brush fixing ring 20 for cleaning the drain holes 18.

The inner cylinder 16 in the spiral dehydrator 3 is a filter cylinder with a length of 4-5m. The diameter of the filter cylinder gradually decreases along the sludge flow direction, and the angle between the central axis of the filter cylinder and the horizontal plane is 20-30°. The lower end is the filter cylinder feed end, and the higher end is the filter cylinder discharge end. The diameter of the filter cylinder feed end is 2-2.5m, and the diameter of the filter cylinder discharge end is 1.5-2m. The hole spacing of the drainage hole 18 is 2-3cm, and the hole diameter is 2-3mm. The hole diameter gradually increases from the feed end to the discharge end. The filter cylinder can rotate along the central axis, the rotation direction is clockwise, and the speed is 3-5 rpm.

The outer cylinder 17 in the spiral dehydrator 3 is a water collecting cylinder with a length of 4-5m. The diameter of the water collecting cylinder gradually decreases along the sludge flow direction. The angle between the central axis of the water collecting cylinder and the horizontal plane is 20-30°. The lower end is the water collecting cylinder feed end, and the higher end is the water collecting cylinder discharge end. The distance between the inner and outer cylinders is 10-15cm.

The diameter of the water collecting drum inlet end is 2.1-2.6m, and the diameter of the water collecting drum outlet end is 1.6-2.1m. A drain outlet is provided at the bottom of the water collecting drum, and the length of the drain outlet is 40-50cm, and the width is 40-50cm. The upper hopper 2 provided at the water collecting drum inlet end is in an inverted trapezoidal shape, and the length of the upper hopper 2 is 80-100cm, and the width is 60-80cm; the discharge end of the water collecting drum is provided with a discharge trough 12, and the length of the discharge trough 12 is 300-350cm, and the width is 20-40cm. The water collecting drum is fixed and cannot be rotated.

The spiral shaft is coaxially arranged with the inner cylinder, and the diameter of the spiral shaft 14 is 2-3 cm. The spiral blade 15 is fixedly connected with the spiral shaft 14, and the diameter of the spiral blade 15 is adapted to the diameter of the inner cylinder, and the pitch is 75-125 cm, and the rotation speed is 5-10 rpm.

The filter belt filtering device includes an upper filter belt, a lower filter belt, seven dewatering rollers 6 of different diameters, a discharge roller 7 of 30-45 cm in diameter, a transmission roller 8 of 50-60 cm in diameter, two steering rollers 5 of 20-30 cm in diameter, and four support rollers 4 of 20-30 cm in diameter, wherein the largest dewatering roller has a diameter of 100-120 cm, and the smallest dewatering roller has a diameter of 20-30 cm; the sludge passes through a steering roller 5, seven dewatering rollers 6 and a transmission roller 8 on the upper filter belt in turn, and the upper filter belt is tightened by the action of three support rollers 4; the sludge passes through another steering roller 5, seven dewatering rollers 6 and a discharge roller 7 on the lower filter belt in turn, and the lower filter belt is tightened by the action of another support roller 4. The upper filter belt and the lower filter belt are tightened and fitted within the interval of the seven dewatering rollers to perform the filter belt dewatering operation.

The filter belt filtering device also includes two flushing nozzles 9, which are used for flushing the upper filter belt and the lower filter belt respectively.

The power device includes three motors, which are used to control the rotation of the transmission roller 8, the screw shaft 14 and the inner cylinder respectively.

The tail water collection device includes two water collection tanks. Water collection tank No. 1 10 collects the tail water of the screw extrusion device, with a length of 6.5-7m, a width of 4-4.5m, and a depth of 1-1.5m. Water collection tank No. 2 11 collects the tail water of the filter belt filtering device, with a length of 6.5-7m, a width of 4-4.5m, and a depth of 1-1.5m. A drainage port is opened at the bottom of the water collection tank with a diameter of 20-30cm, and the lower edge of the drainage port is 3-5cm away from the bottom of the water collection tank.

The working process of the above-mentioned spiral extrusion belt filter press is as follows:

When the spiral extrusion belt filter press is working, the conditioned river sludge is put into the upper hopper 2, and the spiral shaft 14 rotates counterclockwise, driving the spiral blades 15 to slowly push the municipal sludge to the discharge trough 12. The water separated from the sludge is discharged from the drainage hole of the inner cylinder 16 during the rotation. Since the diameter of the spiral dehydrator 3 gradually decreases along the sludge flow direction, the volume of the sludge in the inner cylinder decreases, and the pressure increases. Under the action of pressure, the moisture in the sludge is further squeezed out and discharged through the drainage hole 18. The gradually increasing aperture of the drainage hole is conducive to the rapid discharge of moisture. During the spiral extrusion process, the inner cylinder 16 rotates clockwise at a speed of 5 rpm. The drainage hole 18 can be cleaned by a brush 19 to avoid blockage. The water discharged through the drainage hole 18 is collected in the outer cylinder 17, and finally enters the No. 1 water collection tank 10 through the drainage port 13. The sludge that has been squeezed in the inner cylinder enters the filter belt filtration area through the discharge tank 12. Under the action of the dewatering roller 6, the mud cake is further squeezed, and the tail water of the filter pressure flows into the water collection tank 11 at the bottom. After the filter pressure is completed, the filter belt is rinsed through the flushing nozzle 9, and the flushing water flows into the No. 2 water collection tank 11 at the bottom. Finally, the squeezed mud cake is discharged through the discharge roller 7 to complete the squeezing.

Through actual testing, the moisture content of the mud cake of the spiral extrusion belt filter press of the utility model is 45-50%, which is about 10%-15% lower than the moisture content of the mud cake of the traditional belt filter press, which is 55%-65%.

Claims (10)

1. A spiral extrusion belt filter press, characterized in that it comprises a frame (1) and a spiral extrusion device, a filter belt filtering device, a power device and a tail water collecting device arranged on the frame (1), wherein: The screw extrusion device is installed obliquely, and comprises a screw shaft (14), an inner cylinder (16) coaxially arranged and open at both ends, and an outer cylinder (17) closed at both ends, wherein the length of the inner cylinder is adapted to the inner length of the outer cylinder, and the outer cylinder (17) is sleeved outside the inner cylinder (16); An upper hopper (2) is provided on the lower side of the screw extrusion device, and the sludge is fed into the inner cylinder through the upper hopper (2); A discharge trough (12) is provided on the higher side of the screw extrusion device for discharging the sludge extruded in the inner cylinder (16); The diameter of the inner cylinder (16) gradually decreases along the sludge conveying direction, and the diameter of the end close to the discharge trough (12) is smaller. A plurality of drainage holes (18) are provided on the side wall of the inner cylinder (16): The spiral shaft (14) is provided with a spiral blade (15) whose diameter is adapted to the inner diameter of the inner cylinder (16); the spiral shaft (14) rotates counterclockwise, and the squeezed sludge falls into the filter belt filtering device through the discharge trough (12); and a drainage port (13) is also provided at the bottom of the lower end of the outer cylinder (17); The filter belt filter device further squeezes the sludge under the action of the power device until it is discharged; The tail water collecting device collects the water squeezed out by the spiral squeezing device and the filter belt filtering device and discharges it. 2. The spiral extrusion belt filter press as described in claim 1 is characterized in that: the inner cylinder (16) rotates clockwise under the action of the power device; a plurality of brush fixing rings (20) are installed at intervals on the inner wall of the outer cylinder (17), and a plurality of strip brushes extending along the sludge conveying direction are also arranged between the inner cylinder and the outer cylinder, and the strip brushes are fixed on the brush fixing ring (20) for cleaning the drainage hole (18). 3. The spiral extrusion belt filter press as described in claim 1 is characterized in that: the tail water collecting device is composed of a water collecting tank No. 1 (10), a water collecting tank No. 2 (11) and a drain port, and the drain port is respectively arranged on the side bottom walls of the water collecting tank No. 1 (10) and the water collecting tank No. 2 (11), and the water squeezed by the spiral extrusion device and the filter belt filtering device is gathered in the water collecting tank No. 1 (10) and the water collecting tank No. 2 (11), and discharged from the drain port. 4. The spiral extrusion belt filter press according to any one of claims 1 to 3 is characterized in that: the filter belt filtering device includes seven dewatering rollers (6) of different diameters fixed on the frame (1), a discharge roller (7), a transmission roller (8), two steering rollers (5), four support rollers (4) and two filter belts, the transmission roller (8) drives the other rollers to rotate through the filter belt under the action of the power device, the filter belt is in close contact with the roller, and when the roller rolls, the roller and the filter belt generate a compression force on the sludge, and the filter belt filtering device also includes two flushing nozzles (9) for flushing the filter belt after unloading. 5. The spiral extrusion belt filter press according to claim 4, characterized in that the diameter of the spiral shaft (14) is 2-3 cm, the pitch is 75-125 cm, and the rotation speed is 5-10 rpm. 6. The spiral extrusion belt filter press as described in claim 5 is characterized in that: the opening diameter of one end of the inner cylinder (16) is 2-2.5m, and the opening diameter of the other end is 1.5-2m, the central axis of the inner cylinder (16) is at an angle of 20-30° with the horizontal plane, the rotation direction is opposite to the rotation direction of the spiral shaft, the rotation speed is 3-5 rpm, the hole spacing of the drainage holes (18) is 2-3cm, the hole diameter is 2-3mm, and the hole diameter gradually increases from the lower end to the higher end. 7. The spiral extrusion belt filter press according to claim 6 is characterized in that: the diameter of one end of the outer cylinder (17) is 2.1-2.6m, the diameter of the other end is 1.6-2.1m, and the length is 4.5-5.5m. The outer cylinder (17) and the inner cylinder (16) have the same inclination angle, and the distance between the inner and outer cylinders is 10-15cm. The discharge trough (12) is 300-350cm long and 20-40cm wide. The drain outlet (13) is 40-50cm long and 40-50cm wide. 8. The spiral extrusion belt filter press as described in claim 7 is characterized in that: among the dewatering rollers (6), the larger diameter is 100-120 cm, the smaller dewatering roller (6) has a diameter of 20-30 cm, the discharge roller (7) has a diameter of 30-45 cm, the transmission roller (8) has a diameter of 50-60 cm, the steering roller (5) has a diameter of 20-30 cm, and the support roller (4) has a diameter of 20-30 cm. 9. The spiral extrusion belt filter press as described in claim 3 is characterized in that: the No. 1 water collection trough (10) collects the tail water of the spiral extrusion device, has a length of 6.5-7m, a width of 4-4.5m, and a depth of 1-1.5m; the No. 2 water collection trough (11) collects the tail water of the filter belt filtering device, has a length of 6.5-7m, a width of 4-4.5m, and a depth of 1-1.5m; the side bottom walls of the two water collection troughs are both provided with drainage ports with a diameter of 20-30cm, and the lower edge of the drainage port is 3-5cm away from the bottom of the water collection trough. 10. The spiral extrusion belt filter press according to claim 9, characterized in that the upper hopper (2) is 80-100 cm long and 60-80 cm wide.