CN107082550B - Sewage sludge dewatering device based on electromagnetic force - Google Patents
Sewage sludge dewatering device based on electromagnetic force Download PDFInfo
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- CN107082550B CN107082550B CN201710410610.2A CN201710410610A CN107082550B CN 107082550 B CN107082550 B CN 107082550B CN 201710410610 A CN201710410610 A CN 201710410610A CN 107082550 B CN107082550 B CN 107082550B
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- filter plate
- electromagnetic
- auxiliary filter
- main
- connecting rod
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- 239000010801 sewage sludge Substances 0.000 title claims abstract description 27
- 239000010802 sludge Substances 0.000 claims abstract description 73
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 37
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 12
- 230000000670 limiting effect Effects 0.000 claims description 54
- 239000004744 fabric Substances 0.000 claims description 25
- 230000018044 dehydration Effects 0.000 claims description 22
- 238000006297 dehydration reaction Methods 0.000 claims description 22
- 239000000428 dust Substances 0.000 claims description 15
- 230000003014 reinforcing effect Effects 0.000 claims description 15
- 230000007246 mechanism Effects 0.000 claims description 12
- 238000007789 sealing Methods 0.000 claims description 10
- 230000009471 action Effects 0.000 claims description 9
- 239000010865 sewage Substances 0.000 claims description 4
- 239000000126 substance Substances 0.000 claims description 2
- 238000005265 energy consumption Methods 0.000 abstract description 3
- 208000005156 Dehydration Diseases 0.000 description 19
- 238000000034 method Methods 0.000 description 7
- 230000008569 process Effects 0.000 description 6
- 230000009467 reduction Effects 0.000 description 6
- 238000001914 filtration Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 230000002829 reductive effect Effects 0.000 description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 2
- 235000011941 Tilia x europaea Nutrition 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 239000004571 lime Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- -1 meanwhile Substances 0.000 description 2
- 230000036961 partial effect Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 229910021578 Iron(III) chloride Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000003795 desorption Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/121—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering
- C02F11/122—Treatment of sludge; Devices therefor by de-watering, drying or thickening by mechanical de-watering using filter presses
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/003—Filters formed by clamping together several filtering elements or parts of such elements integrally combined with devices for controlling the filtration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D25/00—Filters formed by clamping together several filtering elements or parts of such elements
- B01D25/12—Filter presses, i.e. of the plate or plate and frame type
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
Abstract
The invention relates to a sewage sludge dewatering device based on electromagnetic force, which comprises a front end auxiliary filter plate (7), a rear end auxiliary filter plate (19), a middle main filter plate (11), a middle auxiliary filter plate (10), an electromagnetic iron core (4) and an electromagnetic coil (5), wherein the electromagnetic coil (5) is coiled on the corresponding electromagnetic iron core (4) to form an electromagnetic module, the electromagnetic module is arranged on the outer side of the front end auxiliary filter plate (7), the electromagnetic module is arranged on the inner side of the rear end auxiliary filter plate (19), a plurality of filter plate modules are arranged between the front end auxiliary filter plate (7) and the rear end auxiliary filter plate (19), and each filter plate module comprises a middle main filter plate (11), a middle auxiliary filter plate (10) and an electromagnetic module. The invention adopts electromagnetic force, and has the advantages of few vulnerable parts, no need of hydraulic system, low energy consumption and lower water content of dehydrated sludge.
Description
Technical Field
The invention relates to the field of sewage sludge treatment, in particular to a sewage sludge dewatering device based on electromagnetic force.
Background
In the prior art, more sludge deep dehydration equipment appears in the market is a diaphragm plate-and-frame filter press, the efficiency is lower during dehydration, the squeezing pressure is only 1.6MPa, water is injected into the diaphragm plate frame by a high-pressure water pump during squeezing, the diaphragm is inflated to reduce the area of a filter chamber, and the diaphragm plate frame is squeezed by virtue of plastic deformation of the plate frame; the diaphragm plate frame has small compression ratio and long relative working period. In addition, on the structure of the common elastic pressing plate frame in the market, the filtering plates are all integral injection molding modules, the filtering plates are easy to damage and deform, and the damaged filtering plates need to be replaced integrally, so that the maintenance cost is higher, more importantly, due to the structural characteristics and the low pressing pressure, the current diaphragm plate frame filter press can be used for pressing and dehydrating municipal sludge to about 60%, the water content of the diaphragm plate frame filter press is reduced greatly compared with that of the prior plate frame filter press, the diaphragm bulge produces secondary pressing on the sludge, namely, the sludge press chamber is a variable chamber, but lime and ferric salt with the absolute sludge amount of about 30% are required to be added into the device, so that the sludge amount is greatly increased, the added lime, ferric chloride and the like bring adverse effects to the subsequent treatment and disposal of the sludge, and the reduction and harmless principles of the sludge treatment and disposal are violated.
The ultra-high pressure elastic squeezing sludge dewatering machine mainly comprises a high-pressure oil cylinder, an ultra-high pressure filter plate, a distributing plate, a spring medium, special filter cloth, a rear end auxiliary filter plate, a push plate, a main beam and the like. The dewatering process of the squeeze plate is mainly divided into two stages, wherein the first stage is to convey materials to a filter chamber by a feed pump, and the solid-liquid separation is carried out by the pressure of the feed pump while feeding, namely, one-time filtration and dewatering; the second stage is elastic squeezing, one end of the device is fixed, the other end applies external pressure through a hydraulic cylinder, and the material is squeezed through an elastic force transfer device (spring) to carry out secondary dehydration. By carrying out ultrahigh pressure squeezing on the sludge, the squeezing pressure is about 5MPa, and a high-pressure oil pump is required to provide about 25-30MPa, so that the water content of the sludge can be reduced to about 50%. In addition, the ultra-high pressure elastic squeezer realizes ultra-high pressure squeezing by arranging the springs to change the volume of the sludge squeezing chamber, and because the springs are often subjected to processes of extension, compression and the like, the springs are required to bear alternating loads and are easy to be damaged by fatigue, the springs are easy to be damaged by fatigue, 10-20 high-strength springs are required between each group of plate frames, approximately 1000-2000 high-strength springs are required for 50-100 plate frames, the initial elastic action of the springs is overcome when the springs are squeezed, and the actual squeezing pressure of sludge is smaller than the pressure provided by an ultra-high pressure oil pump when the springs are squeezed for the second time. For example, at a feed pressure of 1MPa, the spring must provide an elastic force of greater than 1MPa so that the chamber between the filter plate and the filter frame is kept to a maximum, and when the high-pressure pump presses the sludge for the second time at the end of the feed pressing, the spring must be overcome, and this partial pressure is the consumed pressure, so that the pressure generated by the high-pressure pump on the sludge is smaller than the actual pressure.
There is also an ultrahigh pressure diaphragm plate-and-frame filter press in the market at present, the device is an upgrade on the original diaphragm plate-and-frame filter press, the pressure of nearly 10MPa is provided for the sludge by injecting 10MPa water into the diaphragm, the two-stage squeezing process is also adopted, namely, the feeding pressure is started, then high-pressure liquid is injected into the diaphragm, the diaphragm is inflated to further squeeze and dewater the sludge, and the water content of municipal sludge can be reduced to about 50% after the sludge is dewatered by the device. One major problem with this device is the life of the diaphragm at such high pressures and large deformations.
The diaphragm plate-and-frame filter press, the high-pressure elastic machine and other devices are all used for providing power for the sludge squeezing and dewatering through the high-pressure oil cylinder, a special hydraulic system is needed to be configured, and the pressure of the hydraulic system is very high when the pressure is high. When the mud is discharged, the filter plates are required to be pulled apart, a special plate pulling device is required to be arranged to pull apart the filter plates one by one, the plate pulling efficiency is low, the time is long, and the whole working time is influenced.
From the above analysis, it can be seen that the variability of the volume of the sludge press chamber must be achieved in order to achieve deep dewatering of the sludge, while the sludge is pressed under high pressure. Both diaphragm plate-and-frame presses and ultra-high pressure elastic presses have variability in the sludge press chamber, but the current deep sludge dewatering equipment has several major problems: (1) The common diaphragm plate-and-frame filter press has smaller sludge squeezing pressure and enough ultrahigh pressure diaphragm plate-and-frame filter press squeezing pressure, but the service life of the diaphragm is a problem; (2) The ultrahigh pressure elastic squeezer realizes the change of the volume of the sludge squeezing chamber by means of springs, and the springs are easy to damage and consume a large amount of squeezing pressure; (3) The larger the pressure is, the stronger the sludge clinging to the filter plate is, so that a compact sludge layer is easy to form, the sludge layer is bonded on the filter cloth, the water discharge resistance is increased, and the dewatering effect is affected; (4) Due to the high compressibility and high water content of sewage and sludge and the characteristic of difficult sludge dehydration caused by capillary water, adsorbed water and internal water contained in the sewage and sludge, the sludge is difficult to be dehydrated deeply by completely adopting mechanical pressure, so that the water content of the sludge reaches a lower level.
Disclosure of Invention
In view of the above, the invention provides an electromagnetic force-based sewage and sludge dewatering device which adopts electromagnetic force and does not need a hydraulic system, aiming at the technical problems of more wearing parts, high energy consumption and high requirement on the pressure of an oil cylinder in the prior art, thereby reducing the complexity of the device and saving the cost and the energy consumption.
The technical scheme is that the electromagnetic force-based sewage sludge dewatering device comprises a front end auxiliary filter plate, a rear end auxiliary filter plate, a middle main filter plate, a middle auxiliary filter plate, an electromagnetic iron core and an electromagnetic coil, wherein the electromagnetic coil is wound on the corresponding electromagnetic iron core to form an electromagnetic module, the electromagnetic module is arranged on the outer side of the front end auxiliary filter plate, the electromagnetic module is arranged on the inner side of the rear end auxiliary filter plate, a plurality of filter plate modules are arranged between the front end auxiliary filter plate and the rear end auxiliary filter plate, each filter plate module comprises a middle main filter plate, a middle auxiliary filter plate and an electromagnetic module, the middle main filter plate and the middle auxiliary filter plate of the plurality of filter plate modules are respectively fixed at two ends of the electromagnetic module, the middle main filter plate of the plurality of filter plate modules faces the front end auxiliary filter plate, the middle auxiliary filter plates of the plurality of filter plate modules face the rear end auxiliary filter plate, so that the auxiliary filter plates are in one-to-one correspondence with the main filter plate to form a plurality of filter plate chambers, and sewage sludge enters the filter plate chambers through sludge inlet pipes;
the front end auxiliary filter plate, the middle main filter plate, the middle auxiliary filter plate and the rear end auxiliary filter plate are sequentially connected through a connecting rod mechanism so as to realize linkage under the electromagnetic force action of the electromagnetic module;
first stage dehydration: the electromagnetic coil in the electromagnetic module is electrified with a first current, the electromagnetic force generated by the electromagnetic module is kept to attract the main filter plate and the auxiliary filter plate together, the electromagnetic coil is powered off after the electromagnetic module is attracted, and the coil is electrified through the limiting device, so that the rotation angle of the connecting rod mechanism is limited; injecting sewage sludge into the filter pressing cavity, and realizing first-stage dehydration under the action of feeding pressure;
and (3) dehydration in the second stage: electrifying an electromagnetic coil in the electromagnetic module again, and electrifying a second current in the same direction as the current direction during suction, wherein the second current is larger than the first current, and the second current gradually increases to gradually increase the pressure between the main filter plate and the auxiliary filter plate;
and (3) mud unloading: the coil on the limiting device is firstly powered off, limiting on the connecting rod mechanism is released, the current direction of part of electromagnetic coils is changed, the electromagnetic force of all filter pressing chambers can become repulsive force, and the main filter plate and the auxiliary filter plate can be separated under the action of the repulsive force, so that sludge discharge is realized.
Optionally, a sealing ring is arranged on the outer ring of the middle main filter plate, and a reinforcing liner and filter cloth are sequentially arranged on the middle main filter plate from inside to outside.
Optionally, the air inlet main pipe is connected with a plurality of air inlet branch pipes, and the air inlet branch pipes are correspondingly communicated with a plurality of filter pressing chambers and are used for introducing high-pressure gas from the air inlet main pipe and entering the corresponding filter pressing chambers through the air inlet branch pipes.
Optionally, the front end auxiliary filter plate, the middle main filter plate and the middle auxiliary filter plate are respectively provided with a filter plate drain pipe for draining filtered water.
Optionally, the link mechanism includes a main link and an auxiliary link, the main link is installed on the rotation center axis of the auxiliary filter plate in the middle of the odd number, the auxiliary link is installed on the rotation center axis of the auxiliary filter plate in the middle of the even number, and the main link and the auxiliary link are connected through a hinge.
Optionally, the middle pair filter plate of odd number piece still be equipped with stop device, stop device include stopper electromagnetic core, stopper coil, spring baffle, reset spring, slide rail and slider, every stop device in the slide rail fix on the middle pair filter plate to realize can accurately inject the rotatory angle of main connecting rod after the slider stretches out, thereby inject the distance of middle pair filter plate and middle main filter plate, stopper electromagnetic core fix on the spacing slider, spring baffle fix at the slide rail, reset spring be used for connecting slider and slide rail.
Optionally, the slider afterbody be magnetic substance, slider and slide rail produce relative motion after stopper coil is electrified, compress reset spring simultaneously, the slider front end stretches out and blocks the main connecting rod.
Optionally, the reduction dehydration device further comprises a dust removal device, and the dust removal device sucks sludge dust brought by high-pressure gas to the dust removal device through negative pressure to remove the sludge dust.
By adopting the structure, compared with the prior art, the invention has the following advantages: (1) The electromagnetic field provides strong squeezing force to squeeze the sludge without hydraulic pressure and a hydraulic system, in addition, the suction force of the electromagnet is changed into repulsive force by changing the current direction of the electromagnetic coil, and the plate is automatically pulled without a plate pulling device; (2) The closed cavity with variable volume is formed by the structure of matching the middle main filter plate, the sealing ring, the middle auxiliary filter plate, the reinforcing liner and the filter cloth, so that the high compressibility characteristic of the sludge is met, vulnerable parts such as springs and diaphragms are not used, the reliability of the equipment is improved, and the service life of the equipment is prolonged; (3) A high-pressure mud feeding pump is adopted, the mud feeding pump is a high-pressure plunger pump, the high-pressure feeding pressure can be used for carrying out first feeding pressure dehydration on the sludge, then the coil current is increased, the electromagnetic force is increased to gradually increase the pressure between the main filter press plate and the auxiliary filter press plate, the sludge is gradually pressurized, and the second stage of squeezing dehydration is carried out; (4) Because still some moisture can not get rid of through mechanical system in the mud, this scheme has adopted high-pressure gas generator and subassembly, through high-pressure gas effect, takes away the moisture that mechanical system was difficult to the desorption in the mud through high-pressure air current mode, realizes mechanical squeezing and air current dual effect promptly to further reduce the moisture of mud, reach the degree of depth reduction purpose of mud.
Drawings
Fig. 1 is a front view of a sewage sludge dewatering device based on electromagnetic force according to the present invention;
fig. 2 is a plan view of the electromagnetic force-based sewage sludge dewatering apparatus of the present invention;
fig. 3 is a cross-sectional view of the sewage sludge dehydrating apparatus based on electromagnetic force of the present invention;
FIG. 4 is a partial enlarged view of a cross-sectional view of the sewage sludge dewatering apparatus based on electromagnetic force according to the present invention;
FIG. 5 is a schematic diagram of a positioning device;
FIG. 6 is a schematic diagram of the structure of the electromagnetic force-based sewage sludge dewatering device according to the present invention when the chamber is opened;
FIG. 7 is a schematic diagram of the structure of the electromagnetic force-based sewage sludge dewatering device according to the present invention when the chamber is closed;
fig. 8 is a side view of the chamber of the electromagnetic force-based sewage sludge dewatering apparatus of the present invention when closed.
As shown in the figure, 1, a mud inlet pipe, 2, a plunger pump, 3, a pneumatic ball valve, 4, an electromagnetic iron core, 5, an electromagnetic coil, 6, an air inlet branch pipe, 7, a front end auxiliary filter plate, 8, an air inlet main pipe, 9, a sealing ring, 10, a middle auxiliary filter plate, 11, a middle main filter plate, 12, a main connecting rod, 13, an auxiliary connecting rod, 14, a limiting device, 14-1, a limiting block electromagnetic iron core, 14-2, a limiting block coil, 14-3, a spring baffle, 14-4, a return spring, 14-5, a sliding rail, 14-6, a sliding block, 15, a dust removing device, 16, a high-pressure air pump, 17, a rotary center shaft, 18, a plug pin, 19, a rear end auxiliary filter plate, 20, a filter plate supporting lug, 21, a reinforcing liner, 22, a filter cloth, 23, a main auxiliary filter plate connecting pipe, 24, a limiting bump, 25, a filter plate drain pipe, 26, a control bus, 27, a front end auxiliary filter plate mud inlet pipe, 28 and a system controller.
Detailed Description
The invention will be further described with reference to the drawings and the specific examples.
The invention is intended to cover any alternatives, modifications, equivalents, and variations that fall within the spirit and scope of the invention. In the following description of preferred embodiments of the invention, specific details are set forth in order to provide a thorough understanding of the invention, and the invention will be fully understood to those skilled in the art without such details. Furthermore, the drawings of the present invention are not necessarily to scale, nor are they necessarily drawn to scale.
As shown in the figure, the electromagnetic force-based sewage sludge reduction dewatering device comprises a sludge inlet pipe 1, a high-pressure sludge inlet pump 2, a pneumatic ball valve 3, a front end auxiliary filter plate 7, a sealing ring 10, a dust removing device 15, a rear end auxiliary filter plate 19, a filter plate support lug 20, a reinforcing liner 21, a filter cloth 22, a sludge inlet pipe 27, a filter plate drain pipe 25, a control bus 26 and a system controller 28, wherein the electromagnetic force-based sewage sludge reduction dewatering device also comprises an electromagnetic iron core 4, an electromagnetic coil 5, an air inlet branch pipe 6, an air inlet main pipe 8, an intermediate auxiliary filter plate 9, an intermediate main filter plate 11, a main connecting rod 12, an auxiliary connecting rod 13, a limiting device 14, a high-pressure air pump 16, a rotary center shaft 17, a hinge 18, a main and auxiliary filter plate connecting pipe 23 and a limiting bump 24, wherein a plurality of electromagnetic iron cores 4, electromagnetic coils 5 and main and auxiliary filter plate connecting pipes 23 are arranged between the intermediate main filter plate 11 and the intermediate auxiliary filter plate 9, a plurality of electromagnetic coils 5 and main filter plate connecting pipes 23 form a relatively fixed unit, the electromagnetic coils are alternating current, the size and the direction of the electromagnetic coils can be adjusted, the front end auxiliary filter plate 7 can be fixedly connected with the front end and the pneumatic ball valve 3 and the intermediate filter plate 11. The main link 12 and the sub link 13 connect all the intermediate sub filter plates 10, the front sub filter plates 7, and the rear sub filter plates 19. The outer ring of the middle main filter pressing plate 11 is provided with a semicircular groove for installing the sealing ring 10, the diameter of the sealing ring 10 is smaller than that of the outer diameter of the middle main filter pressing plate, the middle auxiliary filter pressing plate 9, the middle main filter pressing plate 11, the sealing ring 10, the reinforcing liner 20 and the filter cloth 19 form a sealed cavity with variable volume, the sealed cavity is a sludge filter pressing cavity, the scheme of better filter pressing plate frame structure is round, the sealing performance is better, and special requirements can be square.
The filter pressing cavity comprises a middle main filter plate 11, a middle auxiliary filter plate 10, a reinforcing lining 21 and filter cloth 22, wherein the middle main filter plate 11 and the middle auxiliary filter plate 10 are provided with annular and strip-shaped water outlet grooves, the upper half part of the annular and strip-shaped water outlet grooves is connected with an air inlet branch pipe 6, the lower half part of the annular and strip-shaped water outlet grooves is connected with seven through holes of a filter plate drain pipe 25, so that water flowing out of filter pressing can flow into the filter plate drain pipe 25 and simultaneously blow out water on the surface of mud cakes through high-pressure gas to accelerate the flow rate of water, bosses are arranged on two sides of the middle auxiliary filter plate 10, the front end auxiliary filter plate 7 and the rear end auxiliary filter plate 19, a rotary center shaft 17 and a limiting bump 24 are arranged on the bosses and used for installing and connecting a main connecting rod 12 and limiting the rotating direction of the main connecting rod, the reinforcing lining 21 is fixed on each filter plate, the filter cloth 22 wraps the reinforcing lining 21 on the filter plate, and the center positions of the middle main filter plate 11, the middle auxiliary filter plate 10, the reinforcing lining 21 and the filter cloth 22 are provided with mud inlet holes, and the mud holes are formed in the center positions of the filter cloth 22, so that mud can sequentially enter the next main and auxiliary filter plate cavity cavities from the mud inlet holes.
The middle secondary filter plate of the odd number block is also fixedly provided with a limiting device 14, the limiting device 14 comprises a limiting electromagnetic iron core 14-1, a limiting block coil 14-2, a spring baffle 14-3, a return spring 14-4, a sliding rail 14-5, a sliding block 14-6 and the like, the sliding rail 14-5 in each limiting device 14 is fixed at a fixed position of the middle filter plate so as to ensure that the sliding block can accurately limit the rotating angle of the main connecting rod 12 after extending out, thereby indirectly limiting the distance between the middle secondary filter plate 10 and the middle main filter plate 11, further ensuring that a filter pressing cavity is kept closed in the mud feeding process, the limiting electromagnetic iron core 14-1 is fixed on the limiting sliding block 14-6, the limiting block coil 14-2 is connected with a controller and receives a switch signal, the spring baffle 14-3 is fixed on the sliding rail 14-5, so that the return spring 14-4 has enough stressed area, the return spring 14-4 is responsible for connecting the sliding block 14-6 and the original sliding rail 14-5, the position of the sliding block 14-6 can be restored to the position of the sliding block after the sliding block 14-5 moves relatively, and the end 14-6 is relatively compressed by the magnetic material of the limiting block 14-6 and the sliding block 14-4 when the end of the sliding block 14-4 extends out of the sliding rail 14-6 relatively to the sliding rail 14-5. The odd number middle filter press plates refer to the middle filter press plates from the mud inlet end, namely from left to right in the figure, as exemplified by filter press chambers in thin frames in fig. 2, and the middle filter press plates in the first frame and the third frame are the odd number middle filter press plates, and the middle filter press plates in the second frame in the middle are the even number middle filter press plates.
The main connecting rod 12 is arranged on the rotating center shaft 17 of the odd-numbered middle auxiliary filter plates, the auxiliary connecting rod 12 is arranged on the rotating center shaft 17 of the even-numbered middle auxiliary filter plates, the main connecting rod 12 and the auxiliary connecting rod 12 are connected through a bolt, and the direction limiting protruding points 24 are arranged on the boss edges on two sides of the filter plates, so that the main connecting rod 12 can only rotate below the direction limiting protruding points 24.
The upper ends of the front end auxiliary filter plate 7, the middle auxiliary filter plate 10 and the middle main filter plate 11 are respectively provided with a high-pressure air inlet hole and connected with an air inlet branch pipe 6, the filter plates are provided with through holes, the high-pressure gas generator and components comprise a high-pressure air pump 16, the air inlet branch pipe 6 and an air inlet main pipe 8, the air inlet branch pipe 6 is a hose which can move along with the filter plates, high-pressure gas can enter a sludge filter pressing cavity through the high-pressure air pump 16, the air inlet main pipe 8, the air inlet branch pipe 6 and the through holes, the lower ends of the front end auxiliary filter plate 7, the middle auxiliary filter plate 10 and the middle main filter plate 11 are respectively provided with a liquid discharge through hole which is connected with a filter plate drain pipe 25, the drain pipe 25 is connected with a drain main pipe through the hose, and the tail end of the drain main pipe is provided with an electromagnetic valve.
The sewage sludge dewatering and reducing device by means of electromagnetic force is also provided with a system controller 28 and a control bus 26, so that automatic control of the system is realized. The pneumatic ball valve 3 is connected with the system controller 28 to realize automatic opening and closing, and the electromagnetic coil 5 and the limiting block coil 142 on each filter plate are connected with the system controller 28 through the control bus 26.
The water outlet valve is an electromagnetic water outlet valve and can be automatically controlled to be opened and closed. The electromagnetic force sewage sludge reduction dehydration device also comprises a dust removal device 15, the dust removal device 15 removes sludge dust brought by high-pressure gas through negative pressure, and the primary sedimentation device can be a cloth bag, a cyclone separator or a combination of the cloth bag and the cyclone separator.
The working principle of the device is as follows:
taking the initial state as an example that all chambers are opened, a controller sends a command to the electromagnetic coil, a smaller current is supplied to the electromagnetic coil, only the electromagnetic force generated by the current can attract the main filter plate and the auxiliary filter plate together, the electromagnetic coil is powered off after the electromagnetic coil is attracted, the limiting device coil is powered on, the limiting sliding block stretches out of the limiting sliding rail to limit the rotation angle of the main connecting rod, then the pneumatic ball valve is opened, the high-pressure mud pump injects mud into the filter pressing chamber, the main filter plate and the auxiliary filter plate move towards two sides under the pressure of mud, the filter pressing chamber gradually increases, the limiting sliding block is limited to the maximum, the main connecting rod is clamped to rotate, the volume of the chamber is fixed, the relative position between the main filter plate and the auxiliary filter plate is fixed, the size of the filter pressing chamber is the initial volume of mud, the mud is filled into the first filter pressing chamber and then enters the second chamber after the mud enters, the main filter plate of the second chamber is pushed to move rightwards, the main filter plate and the auxiliary filter plate are fixed by the main filter plate and the limiting device, and the auxiliary filter plate and the main filter plate and the limiting device are all connected into the whole when the main filter plate and the last filter plate enters the chamber. Under the action of the feeding pressure, the pressure to which the sludge is subjected is between 1.5 and 2.0MPa, the sludge is continuously pumped in, moisture enters into a water outlet groove and a through hole on a filter plate through filter cloth and a reinforcing lining and is discharged from a water outlet valve, the sludge is left in a filter pressing cavity, the filter pressing cavity is filled after a period of feeding dehydration, the sludge cannot enter, a pneumatic ball valve is closed, the feeding of the sludge is stopped, and the feeding dehydration in the first stage is finished.
The second stage of dehydration is prepared, the electromagnetic coil is powered on again, the direction of the current is the same as that of the current during suction, but the current is far greater than the suction current, and the current can be gradually increased to gradually increase the pressure between the main filter plate and the auxiliary filter plate. Each chamber presses sludge in the respective chamber by means of independent electromagnetic suction, and the sludge is pressed and dehydrated in the second stage after being continuously pressed for a period of time;
the controller controls the high-pressure air pump to start working, high-pressure air enters the high-pressure air inlet holes and the through holes on the filter plate through the air inlet branch pipes to blow back the filter cloth tightly attached to the reinforcing lining, the high-pressure air blows away mud cakes tightly attached to the filter cloth, meanwhile, mud particles attached to the filter cloth are blown away, the filter cloth is cleaned, and the high-pressure air also takes away a certain amount of moisture in the mud; in addition, when the mechanical squeezing is carried out, high-pressure gas enters, more water which is difficult to be removed by the mechanical squeezing in the sludge is carried out in a water vapor mode, and when the water outlet valve almost does not have water outlet, the squeezing is stopped, and the whole dehydration process is finished.
In the mud unloading stage, the coil on the limiting device is powered off firstly, the limiting sliding block is restored to the original position through the reset spring, then the current direction of the electromagnetic coil on the combined filter plate block provided with the limiting device is changed, so that electromagnetic force of all filter pressing chambers can become repulsive force, the main filter plate and the auxiliary filter plate can be separated under the repulsive force, mud falls into a conveying mechanism below the device from a gap between the filter plates, the high-pressure air pump still continues to work so that mud blocks fall off from the chambers and residual water and water on the surface of the mud cake are blown out until mud unloading is finished, the limiting device is enabled to malfunction in order to prevent the next closing of the main connecting rod when the chambers are opened, and the limiting protruding points are additionally arranged on the filter plate boss, so that when the filter pressing chambers are pulled to the maximum, the main connecting rod always keeps a small angle with the horizontal direction, the next rotation is facilitated, and the reverse rotation of the connecting rod is avoided. Until the operation of this cycle is completed, each mechanism returns to the initial state again, ready for entering the next cycle, and the cycle operation is repeated.
The sewage sludge dewatering and reducing method based on the device by means of electromagnetic force comprises the following steps:
(1) The electromagnetic coil is electrified with a small current to generate suction force between the main filter plate and the auxiliary filter plate, the main filter plate and the auxiliary filter plate are closed, wherein the middle auxiliary filter plate, the middle main filter plate, the sealing ring, the reinforcing lining and the filter cloth form a closed chamber with the minimum volume, and the main connecting rod and the auxiliary connecting rod rotate downwards;
(2) The electromagnetic coil is powered off, and the coil of the limiting device is powered on, so that the limiting sliding block extends out of the limiting sliding rail to limit the rotation angle of the main connecting rod;
(3) The pneumatic ball valve is opened, the high-pressure mud inlet pump injects mud into the filter pressing cavity, the main filter pressing plate and the auxiliary filter pressing plate move towards two sides under the pressure of the mud, the filter pressing cavity gradually becomes larger, and the limit sliding block is used for clamping the rotation of the main connecting rod when reaching the maximum limit, so that the volume of the cavity is fixed, the relative position between the main filter pressing plate and the auxiliary filter pressing plate is fixed, and the size of the filter pressing cavity is the initial volume of the mud;
(4) The mud enters, the mud fills the first filter pressing chamber and enters the second chamber, the main filter pressing plate of the second chamber is pushed to move rightwards, the main filter pressing plate and the auxiliary filter pressing plate are fixed by the main connecting rod, the auxiliary connecting rod and the limiting device, according to the embodiment, when the mud enters the last chamber, each filter pressing plate is connected into a whole by the main connecting rod, the auxiliary connecting rod and the limiting device, and all filter pressing chambers reach the maximum;
(5) Under the action of the feeding pressure, the pressure to which the sludge is subjected is between 1.5 and 2.0MPa, the sludge is continuously pumped in, moisture enters into a water outlet groove and a through hole on a filter plate through filter cloth and a reinforcing lining and is discharged from a water outlet valve, the sludge is left in a filter pressing cavity, the filter pressing cavity is filled after a period of feeding dehydration, the sludge cannot enter, a pneumatic ball valve is closed, the feeding of the sludge is stopped, and the feeding dehydration in the first stage is finished;
(6) The second stage of dehydration is started, the electromagnetic coil is powered on again, the direction of the current is the same as that of the current during suction, but the current is far greater than the suction current, and the current can be gradually increased to gradually increase the pressure between the main filter plate and the auxiliary filter plate. Each chamber presses sludge in the respective chamber by means of independent electromagnetic suction, and the sludge is pressed and dehydrated in the second stage after being continuously pressed for a period of time;
(7) The controller controls the high-pressure air pump to start working, high-pressure air enters the high-pressure air inlet holes and the through holes on the filter plate through the air inlet branch pipes to blow back the filter cloth tightly attached to the reinforcing lining, the high-pressure air blows away mud cakes tightly attached to the filter cloth, meanwhile, mud particles attached to the filter cloth are blown away, the filter cloth is cleaned, and the high-pressure air also takes away a certain amount of moisture in the mud;
(8) When the mechanical squeezing is carried out, high-pressure gas enters, more water which is difficult to remove by the mechanical squeezing in the sludge is brought out by water vapor, and when the water outlet valve almost does not have water outlet, the squeezing is stopped, and the whole dehydration process is finished.
(9) In the sludge unloading stage, the coil on the limiting device is powered off firstly, so that the limiting sliding block is restored to the original position through the reset spring, then the current direction of the electromagnetic coil on the combined filter plate block provided with the limiting device is changed, so that electromagnetic force of all filter pressing chambers can become repulsive force, the main filter plate and the auxiliary filter plate can be separated under the repulsive force, sludge falls into a conveying mechanism below the device from a gap between the filter plates and is conveyed out, and the high-pressure air pump still continues to work until the sludge unloading is completed;
(10) After the mud is discharged, all the main filter press plates and the auxiliary filter press plates are separated to return to the initial state, and the next cycle is to be started.
The foregoing is illustrative of the preferred embodiments of the present invention, and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. In general, all changes that come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (5)
1. The utility model provides a sewage sludge dewatering device based on electromagnetic force, includes front end auxiliary filter plate (7), rear end auxiliary filter plate (19), middle main filter plate (11), middle auxiliary filter plate (10), electromagnetic core (4) and electromagnetic coil (5), electromagnetic coil (5) roll up and locate on corresponding electromagnetic core (4) to form electromagnetic module, the outside of front end auxiliary filter plate (7) be equipped with electromagnetic module, the inboard of rear end auxiliary filter plate (19) be equipped with electromagnetic module, front end auxiliary filter plate (7) and rear end auxiliary filter plate (19) between be equipped with a plurality of filter plate modules, every filter plate module includes middle main filter plate (11), middle auxiliary filter plate (10) and an electromagnetic module, middle main filter plate (11) and middle auxiliary filter plate (10) of a plurality of filter plate modules fix respectively in the both ends of this electromagnetic module, middle main filter plate of a plurality of filter plate modules is towards front end auxiliary filter plate (7), middle auxiliary filter plate (10) of a plurality of filter plate modules are towards rear end auxiliary filter plate (19) for vice sewage and main filter plate form a plurality of filter plate and are cooperated one by one and are passed through filter-press mud filter plate cavity (1) and are got into filter pressing cavity through;
the sewage sludge dewatering device based on electromagnetic force also comprises a connecting rod mechanism, wherein the connecting rod mechanism comprises a main connecting rod (12) and an auxiliary connecting rod (13), the main connecting rod (12) is arranged on a rotating center shaft (17) of an odd-numbered middle auxiliary filter plate (10), the auxiliary connecting rod (13) is arranged on the rotating center shaft (17) of an even-numbered middle auxiliary filter plate (10), and the main connecting rod (12) and the auxiliary connecting rod (13) are connected through a hinge;
the front end auxiliary filter plate (7), the middle main filter plate (11), the middle auxiliary filter plate (10) and the rear end auxiliary filter plate (19) are sequentially connected through a connecting rod mechanism so as to realize linkage under the electromagnetic force action of the electromagnetic module;
the odd-numbered middle auxiliary filter plate (10) is further provided with a limiting device (14), the limiting device comprises a limiting block electromagnetic iron core (14-1), a limiting block coil (14-2), a spring baffle (14-3), a return spring (14-4), a sliding rail (14-5) and a sliding block (14-6), the sliding rail (14-5) in each limiting device (14) is fixed on the middle auxiliary filter plate (10) so as to accurately limit the rotating angle of a main connecting rod (12) after the sliding block (14-6) stretches out, the distance between the middle auxiliary filter plate (10) and the middle main filter plate (11) is limited, the limiting block electromagnetic iron core (14-1) is fixed on the sliding block, the spring baffle (14-3) is fixed on the sliding rail, and the return spring (14-4) is used for connecting the sliding block (14-6) and the sliding rail (14-5).
The tail part of the sliding block (14-6) is a magnetic substance, when the limiting block coil (14-2) is powered on, the sliding block (14-6) and the sliding rail (14-5) move relatively, meanwhile, the reset spring (14-4) is compressed, and the front end of the sliding block (14-6) extends out to clamp the main connecting rod (12);
first stage dehydration: the electromagnetic coil in the electromagnetic module is electrified with a first current, the electromagnetic force generated by the electromagnetic module is kept to attract the main filter plate and the auxiliary filter plate together, the electromagnetic coil is powered off after the electromagnetic module is attracted, and the coil is electrified through the limiting device, so that the rotation angle of the connecting rod mechanism is limited; injecting sewage sludge into the filter pressing cavity, and realizing first-stage dehydration under the action of feeding pressure;
and (3) dehydration in the second stage: electrifying an electromagnetic coil in the electromagnetic module again, and electrifying a second current in the same direction as the current direction during suction, wherein the second current is larger than the first current, and the second current gradually increases to gradually increase the pressure between the main filter plate and the auxiliary filter plate;
and (3) mud unloading: the coil on the limiting device is firstly powered off, limiting on the connecting rod mechanism is released, the current direction of part of electromagnetic coils is changed, the electromagnetic force of all filter pressing chambers can become repulsive force, and the main filter plate and the auxiliary filter plate can be separated under the action of the repulsive force, so that sludge discharge is realized.
2. The electromagnetic force-based sewage sludge dewatering device according to claim 1, wherein: the outer ring of the middle main filter plate (11) is provided with a sealing ring (9), and the middle main filter plate (11) is sequentially provided with a reinforcing liner (21) and a filter cloth (22) from inside to outside.
3. The electromagnetic force-based sewage sludge dewatering device according to claim 1, wherein: the air inlet main pipe (8) is connected with the plurality of air inlet branch pipes (6), and the plurality of air inlet branch pipes (6) are correspondingly communicated with the plurality of filter pressing chambers and are used for introducing high-pressure gas from the air inlet main pipe and entering the corresponding filter pressing chambers through the air inlet branch pipes (6).
4. The electromagnetic force-based sewage sludge dewatering device according to claim 1, wherein: the front end auxiliary filter plate (7), the middle main filter plate (11) and the middle auxiliary filter plate (10) are respectively provided with a filter plate drain pipe (25) for draining filtered water.
5. The electromagnetic force-based sewage sludge dewatering device according to claim 1, wherein: the dewatering device also comprises a dust removing device (15), and the dust removing device (15) sucks sludge dust brought by high-pressure gas to the dust removing device (15) through negative pressure to remove the sludge dust.
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| CN113480127B (en) * | 2021-07-22 | 2022-11-18 | 深圳市市政工程总公司 | A concentrated dehydration filter-pressing device for solidifying mud |
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| CN101544459A (en) * | 2009-05-11 | 2009-09-30 | 华章电气（桐乡）有限公司 | Plate-type sludge dewatering machine and dewatering method therefor |
| CN105800901A (en) * | 2016-03-21 | 2016-07-27 | 饶宾期 | Reduction dehydration device for sewage sludge |
| CN205886327U (en) * | 2016-08-19 | 2017-01-18 | 四川四通欧美环境工程有限公司 | Compact form filter press is inhaled to electromagnetism |
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| JP3568991B2 (en) * | 1994-07-12 | 2004-09-22 | 株式会社神鋼環境ソリューション | Filter press and dewatering method by the filter press |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101544459A (en) * | 2009-05-11 | 2009-09-30 | 华章电气（桐乡）有限公司 | Plate-type sludge dewatering machine and dewatering method therefor |
| CN105800901A (en) * | 2016-03-21 | 2016-07-27 | 饶宾期 | Reduction dehydration device for sewage sludge |
| CN205886327U (en) * | 2016-08-19 | 2017-01-18 | 四川四通欧美环境工程有限公司 | Compact form filter press is inhaled to electromagnetism |
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Effective date of registration: 20231011 Address after: 323300 long ban Shan District, Yunfeng Street Industrial Park, Suichang County, Lishui City, Zhejiang Province Applicant after: Zhejiang Huijin Environmental Protection Technology Co.,Ltd. Address before: 310018 China Metrology University, 258 Xiyuan street, Xiasha, Jianggan District, Hangzhou, Zhejiang Applicant before: Rao Binqi |
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