CN108558163B - Electromagnetic force filter-pressing dehydration method for sewage sludge - Google Patents
Electromagnetic force filter-pressing dehydration method for sewage sludge Download PDFInfo
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- CN108558163B CN108558163B CN201810091869.XA CN201810091869A CN108558163B CN 108558163 B CN108558163 B CN 108558163B CN 201810091869 A CN201810091869 A CN 201810091869A CN 108558163 B CN108558163 B CN 108558163B
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- 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
- B01D25/164—Chamber-plate presses, i.e. the sides of the filtering elements being clamped between two successive filtering plates
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- 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
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- 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
Abstract
The invention relates to a sewage sludge electromagnetic force filter-pressing dehydration method, which is based on a sewage sludge electromagnetic filter-pressing dehydration device, wherein the sewage sludge electromagnetic filter-pressing dehydration device comprises a plurality of filter-pressing chambers, each filter-pressing chamber comprises a middle main filter plate (9) and a middle auxiliary filter plate (10), electromagnetic modules are respectively arranged on the middle main filter plate (9) and the middle auxiliary filter plate (10), and the middle main filter plate (9) and the middle auxiliary filter plate (10) in the same filter-pressing chamber are mutually attracted through the electromagnetic modules; the adjacent filter pressing chambers are communicated through a hose (12), and the hose (12) is communicated with a mud inlet pipe; a limiting rope (31) for limiting the maximum displacement of the two filter plates is arranged between the two adjacent filter plates; each electromagnetic module comprises an electromagnetic core (6) and an electromagnetic coil (7), and the electromagnetic coil (7) is wound on the corresponding electromagnetic core (6). The invention realizes the aim of the invention through multi-stage dehydration. The invention adopts electromagnetic force, and has the advantages of less easily-damaged parts, no need of hydraulic system, low energy consumption and lower water content of dewatered sludge.
Description
Technical Field
The invention relates to the field of sewage sludge treatment, in particular to a sewage sludge electromagnetic force filter-pressing dehydration method.
Background
In the prior art, most of sludge deep dehydration equipment on the market is a diaphragm plate-and-frame filter press, the efficiency is low during dehydration, the squeezing pressure is only 1.6MPa, water is injected into the diaphragm plate-and-frame by a high-pressure water pump during squeezing, the diaphragm is expanded to reduce the area of a filter chamber, and the diaphragm plate frame is squeezed by plastic deformation of the plate-and-frame; the compression ratio of the diaphragm plate frame is small, and the relative working period is long. In addition, in the structure of the common elastic squeezing plate frame on the market, the filtering plates are all integral injection molding parts, the filtering plates are easy to damage and deform, and the damaged filter plate needs to be replaced integrally, so that the maintenance cost is higher, and more importantly, because of the structural characteristics and low pressing pressure, the prior membrane plate-and-frame filter press can press and dehydrate municipal sludge to about 60 percent, and the water content is reduced a lot compared with the prior plate-and-frame filter press, the main reason is that the sludge is pressed for the second time due to the expansion of the membrane, namely, the sludge filter-pressing chamber is a variable chamber, but the equipment needs to add lime and ferric salt with about 30 percent of absolute dry sludge, thereby greatly increasing the amount of sludge, moreover, the added lime, ferric chloride and the like bring adverse effects on the subsequent treatment of the sludge, and the reduction and harmlessness principles of the sludge treatment are violated.
At present there is also a super high pressure elasticity squeezes sludge dewaterer, this equipment mainly includes high-pressure cylinder, super high pressure filter plate, joins in marriage the board, the spring medium, special filter cloth, the vice filter plate in rear end, the push pedal, girder etc. and constitute, this super high pressure squeezes the sheet frame and includes filter frame, filter plate, filter cloth, studio, spring and piston plate, and the spring sets up between filter frame and filter plate, and the piston plate sets up between studio and filter plate for the filter plate passes through the piston plate and produces the compression effect to the studio. The dewatering process of the press plate is mainly divided into two stages, wherein the first stage is to convey materials to a filter chamber by a feed pump, and solid-liquid separation is carried out by means of the pressure of the feed pump while feeding, namely primary filtration dewatering; the second level is elastic squeezing, one end of the device is fixed, the other end of the device applies external pressure through a hydraulic oil cylinder, and the filter chamber space is compressed through an elastic force transmission device (a spring) to squeeze the materials for secondary dehydration. The water content of the sludge can be reduced to about 50% by carrying out ultrahigh pressure squeezing on the sludge, wherein the squeezing pressure is about 5MPa, and the high-pressure oil pump needs to provide pressure of about 25-30 MPa. Similarly, the ultrahigh pressure elastic squeezer realizes ultrahigh pressure extrusion by changing the volume of the sludge squeezing chamber through the arrangement of the springs, the springs are easy to generate fatigue damage because the springs often complete the processes of extension-compression and the like and need to bear alternating load, the springs are easy to generate wearing parts, 10-20 high-strength springs are needed between each group of plate frames, 50-100 plate frames need nearly 1000-2000 high-strength springs, the initial elastic action of the springs needs to be overcome when the springs are squeezed, and the actual squeezing pressure of the sludge during secondary squeezing is smaller than the pressure provided by the ultrahigh pressure oil pump. For example, when the feeding pressure is 1MPa, the spring must provide an elastic force greater than 1MPa, so that the chamber between the filter plate and the filter frame can be kept maximized, and when the feeding compression is finished, the high-pressure pump performs a second high-pressure compression on the sludge, the elastic force of the spring must be overcome, and the pressure of the high-pressure pump is consumed, so that the pressure generated by the high-pressure pump on the sludge is smaller than the actual pressure.
The existing market also has an ultrahigh pressure diaphragm plate and frame filter press, and this equipment is for upgrading on original diaphragm plate and frame filter press, provides nearly 10 MPa's pressure to mud through the water that injects 10MPa in the diaphragm, also is the process of squeezing for the second grade, begins promptly through feed pressure, then injects high-pressure liquid in the diaphragm, carries out the bulging to the diaphragm and further squeezes the dehydration to mud, and municipal administration mud moisture content can drop to about 50% after this equipment dehydration. One major problem with this device is the life of the diaphragm at such high pressures and large deformations.
The membrane plate-and-frame filter press, the high-pressure elastic machine and other equipment provide power for sludge squeezing and dewatering through the high-pressure oil cylinder, a special set of hydraulic system needs to be configured, and when the high-pressure squeezing is performed, the pressure of the hydraulic system is very high. When mud is discharged, the filter plates need to be pulled apart, so that a special plate pulling device is required to pull the filter plates apart, 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 to achieve deep dewatering of sludge, variability in the volume of the sludge pressing chamber must be achieved, while the sludge is pressed at high pressure. Regardless of the variability of the sludge pressing chamber of the membrane plate-and-frame filter press or the ultrahigh pressure elastic press, the current sludge deep dehydration equipment has the following main problems: (1) the sludge pressing pressure of a common diaphragm plate-and-frame filter press is low, the pressing pressure of an ultrahigh-pressure diaphragm plate-and-frame filter press is enough, but the service life of a diaphragm is long; (2) the ultrahigh-pressure elastic presser realizes the change of the volume of a sludge pressing chamber by virtue of a spring, and the spring is easy to damage and can consume a large amount of pressing pressure; (3) the higher the pressure is, the firmer the sludge tightly attached to the filter plate is, a compact sludge layer is easily formed and is bonded on the filter cloth, the water discharge resistance is increased, and the dehydration effect is influenced; and (4) due to the characteristics of high compressibility and high water content of the sewage sludge and the difficulty in sludge dehydration caused by the fact that the sewage sludge contains capillary water, adsorbed water and internal water, the sludge is difficult to be dehydrated at high depth 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 a sewage sludge electromagnetic force filter-pressing dehydration method which adopts electromagnetic force and does not need a hydraulic system, and the method reduces the complexity of the device and saves the cost and the energy consumption, aiming at the technical problems of more easily damaged parts, high energy consumption and high requirement on the pressure of an oil cylinder in the prior art.
The technical scheme of the invention is that the sewage sludge electromagnetic force filter-pressing dehydration method is provided, based on the sewage sludge electromagnetic force filter-pressing dehydration device, the sewage sludge electromagnetic force filter-pressing dehydration device comprises a plurality of filter-pressing chambers, each filter-pressing chamber comprises a middle main filter plate and a middle auxiliary filter plate, electromagnetic modules are arranged on the middle main filter plate and the middle auxiliary filter plate, and the middle main filter plate and the middle auxiliary filter plate in the same filter-pressing chamber are mutually attracted through the electromagnetic modules; the adjacent filter pressing chambers are communicated through a hose, and the hose is communicated with a mud inlet pipe; a limiting rope for limiting the maximum displacement of the two filter plates is arranged between the two adjacent filter plates; each electromagnetic module comprises an electromagnetic iron core and an electromagnetic coil, and the electromagnetic coil is wound on the corresponding electromagnetic iron core;
the electromagnetic force filter-pressing dehydration method for sewage sludge comprises the following steps:
dewatering in the first stage: a first current is introduced into an electromagnetic coil in the electromagnetic module, so that the generated electromagnetic force attracts a middle main filter plate and a middle auxiliary filter plate of the filter pressing chamber together, the filter pressing chamber is closed and limited, and the electromagnetic coil is powered off; injecting sewage sludge into a filter-pressing chamber, enabling a middle main filter plate and a middle auxiliary filter plate in the filter-pressing chamber to reach the maximum limit distance, and realizing first-stage dehydration under the action of feeding pressure;
and (3) second stage dehydration: electrifying the electromagnetic coil in the electromagnetic module again, and introducing a second current, wherein the direction of the second current is the same as the current direction in the process of suction, the second current is larger than the first current, the second current is increased to increase the pressure between the middle main filter plate and the middle auxiliary filter plate, and the second stage of dehydration is realized through the electromagnetic suction force formed in the filter pressing chamber;
and (3) dehydrating in a third stage: when the current direction of the electromagnetic coil on the middle main filter plate and/or the middle auxiliary filter plate is changed, the attraction force is continuously kept between the filter plates of the filter pressing chambers, and the repulsion force is changed between the adjacent filter pressing chambers, so that the sludge is further squeezed and dewatered.
Alternatively, the electromagnetic force between the intermediate main filter plate and the intermediate auxiliary filter plate in the filter press chambers and the electromagnetic force between the adjacent filter press chambers may be arbitrarily switched between the repulsive force and the attractive force.
Optionally, the electromagnetic filter-pressing dewatering device further comprises a first plate and a tail plate, the first plate is located at the front end of the first filter-pressing cavity, a through hole for the mud inlet pipe to penetrate through is formed in the first plate, and the tail plate is located at the rear end of the last filter-pressing cavity.
Optionally, the electromagnetic filter-pressing dewatering device further comprises a rack support, a rack and a clamping mechanism, wherein the rack support is vertically fixed on the first plate, the rack is fixed on the rack support and is parallel to the filter-pressing direction, the tail end of the rack is fixed on the frame, the clamping mechanism is mounted on the tail plate, the rack is clamped through the clamping mechanism in a clamping state, and at the moment, the tail plate can only move towards the first plate in a single direction;
in the second stage of dehydration, the clamping mechanism is clamped on the rack to enable the tail plate to move in a single direction, and meanwhile, the current of the electromagnetic coil is gradually increased to enable the pressure between the middle main filter plate and the middle auxiliary filter plate to be gradually increased; in the third stage of dehydration process, the blocking mechanism is blocked on the rack, so that the repulsion force between the adjacent filter pressing chambers can only push the filter plate to reduce the filter pressing chambers.
Optionally, be equipped with main filter plate supporting plate frame on the middle main filter plate, middle vice filter plate, main filter plate supporting plate frame, first board and tailboard both sides all be equipped with the boss, have the gag lever post that is equipped with the draw-in groove on the boss of main filter plate supporting plate frame, be equipped with bolt mechanism on the vice filter plate of centre, during the first stage dehydration spacing indicate: and the sliding block of the bolt mechanism is inserted into the clamping groove of the limiting rod.
Optionally, screens mechanism includes screens sliding tooth, screens slide rail, sliding tooth reset spring and sliding tooth driving electromagnet, the screens sliding tooth is mutually supported with the rack, and slide in the screens slide rail, sliding tooth reset spring cover is located on the screens sliding tooth, through switching on and cutting off the power supply of sliding tooth driving electromagnet switches, realizes breaking away from of screens sliding tooth and rack switches with the state of block.
Optionally, the bolt mechanism includes stopper electromagnetic core, stopper coil, spring baffle, reset spring, slider and spacing slide rail, stopper electromagnetic core fixes on spacing slide rail, and the stopper coil winding is in stopper electromagnetic core, the slider sets up in spacing slide rail to be connected with reset spring, simultaneously, stopper electromagnetic core and stopper coil are right under the on-state the slider produces the magnetic attraction.
Optionally, the bolt mechanism further comprises a spring baffle, one side of the spring baffle abuts against the electromagnetic iron core, the other end of the spring baffle is connected with the reset spring, and the other end of the reset spring is connected with the sliding block.
Optionally, the outer ring of the middle main filter plate is provided with a semicircular groove for installing a seal ring, the diameter of the seal ring is smaller than the outer diameter of the middle main filter plate, the middle main filter plate and the middle auxiliary filter plate are provided with a reinforcing lining and filter cloth from inside to outside, and the middle auxiliary filter plate, the middle main filter plate, the middle seal ring, the reinforcing lining and the filter cloth form a filter pressing chamber with a variable volume.
Optionally, the upper parts of the middle main filter plate and the middle auxiliary filter plate are both provided with high-pressure air inlets and communicated with corresponding air inlet branch pipes, and high-pressure air can enter the filter pressing chamber through the high-pressure air pump, the air inlet main pipe, the air inlet branch pipes and the high-pressure air inlets; the lower ends of the main filter plate and the auxiliary filter plate are respectively provided with a liquid discharge through hole which is connected with a filter plate drainage branch pipe, and the drainage branch pipe is communicated with a drainage main pipe; in the second stage of dehydration, after continuously squeezing for a period of time, introducing high-pressure gas into each filter pressing cavity by using a high-pressure gas pump, and blowing out the residual water and the water on the surface of the mud cake; in the third stage of dehydration process, the high-pressure air pump works, high-pressure air enters the high-pressure air inlet hole on the filter plate through the air inlet branch pipe to perform back flushing on the filter cloth tightly attached to the reinforcing lining, the high-pressure air blows away mud cakes tightly attached to the filter cloth and simultaneously blows away sludge particles attached to the filter cloth to clean the filter cloth, and partial moisture in the sludge is taken away by the high-pressure air.
Compared with the prior art, the method has the following advantages that: (1) the cavity with variable volume formed between the main filter plate and the auxiliary filter plate meets the high compressibility characteristic of sludge, and easily damaged parts such as springs and diaphragms do not exist, so that the reliability of equipment is improved, and the service life of the equipment is prolonged; (2) the sludge can be subjected to primary feeding pressure dehydration through the high-pressure feeding pressure; then increasing the current of the coil and increasing the electromagnetic force to gradually increase the pressure between the main filter press plate and the auxiliary filter press plate, gradually pressurizing the sludge, and performing second-stage squeezing dehydration; finally, the clamping sliding teeth are clamped on the rack, the current direction of the coil is changed at the same time, so that attraction force between the filter pressing chambers is kept continuously, and two sides of the chambers become repulsive force to further press sludge in the filter pressing chambers; because partial moisture in the sludge can not be removed in a mechanical mode, the high-pressure gas generator and the high-pressure gas generator assembly are adopted in the scheme, and the moisture which is difficult to remove in the mechanical mode in the sludge is taken away in a high-pressure airflow mode under the action of high-pressure gas, namely, the double effects of mechanical squeezing and airflow are realized, so that the moisture in the sludge is further reduced, and the purpose of sludge depth reduction is achieved.
Drawings
FIG. 1 is a front view of a sewage sludge electromagnetic force filter-pressing dewatering device;
FIG. 2 is a top view of the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 3 is a sectional view of the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 4 is an enlarged view of a portion of a cross-sectional view of the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 5 is a second enlarged view of a cross-sectional view of the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 6 is a three-dimensional view of a plunger mechanism in the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 7 is a side view of the main filter plate support plate frame in the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 8 is an axial side view of a tail plate and a clamping mechanism thereon of the electromagnetic force filter-pressing dewatering device for sewage sludge;
FIG. 9 is an axial side view of the sewage sludge electromagnetic force filter-pressing dewatering device;
FIG. 10 is a schematic view showing a state in which the electromagnetic filter-press dehydration apparatus for sewage sludge is engaged;
FIG. 11 is a schematic view showing a state of the electromagnetic force filter-pressing dewatering device for sewage sludge during filter-pressing by repulsive force;
FIG. 12 is a schematic view showing the state of the filter-pressing chamber of the electromagnetic filter-pressing dehydration device for sewage sludge when the filter-pressing chamber is opened.
As shown in the figure, 1, a high-pressure mud inlet pipe, 2, a plunger pump, 3, a pneumatic ball valve, 4, a rack support, 5, a rack, 6, an electromagnetic iron core, 7, an electromagnetic coil, 8, an air inlet branch pipe, 9, a middle main filter plate, 10, a middle auxiliary filter plate, 11, a connecting block, 12, a hose, 13, a limiting rod, 14, a bolt mechanism, 14-1, a limiting block electromagnetic iron core, 14-2, a limiting block coil, 14-3, a spring baffle, 14-4, a reset spring, 14-5, a sliding block, 14-6, a limiting sliding rail, 15, a dust removal device, 16, a clamping sliding tooth, 17, a clamping sliding rail, 18, a sliding tooth reset spring, 19, a sliding tooth driving electromagnet, 20, a tail plate, 21, a sealing ring, 22, a filter plate support lug, 23, a reinforcing lining, 24, filter cloth, 25, a main filter plate support plate frame, 26, a drainage branch pipe, the device comprises a control bus 28, a first plate 29, a system controller 30, a filter plate boss 31 and a limiting rope.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
The invention is intended to cover alternatives, modifications, equivalents, and alternatives that may be included within the spirit and scope of the invention. In the following description of the preferred embodiments of the present invention, specific details are set forth in order to provide a thorough understanding of the present invention, and it will be apparent to those skilled in the art that the present invention may be practiced without these specific details. Moreover, the drawings of the present invention are not necessarily to scale, nor are they necessarily to scale, as may be shown and described herein.
As shown in the figure, the electromagnetic force filter-pressing dehydration device for sewage sludge comprises a plurality of filter-pressing chambers, wherein each filter-pressing chamber comprises a middle main filter plate 9 and a middle auxiliary filter plate 10, the middle main filter plate 9 and the middle auxiliary filter plate 10 are respectively provided with an electromagnetic module, and the middle main filter plate 9 and the middle auxiliary filter plate 10 in the same filter-pressing chamber are mutually attracted through the electromagnetic modules; the adjacent filter pressing chambers are communicated through a hose 12, and the hose 12 is communicated with a high-pressure mud inlet pipe; a limiting rope 31 for limiting the maximum displacement of the two filter plates is arranged between the two adjacent filter plates; each electromagnetic module comprises an electromagnetic core 6 and an electromagnetic coil 7, and the electromagnetic coil 7 is wound on the corresponding electromagnetic core 6. The high-pressure sludge inlet pipe 1 is arranged at a sewage sludge inlet of the device, the opening and closing of the high-pressure sludge inlet pipe 1 are controlled by a pneumatic ball valve 3, the high-pressure sludge inlet pipe is provided with a plunger pump 2, the plunger pump 2 is used as a sludge inlet pump, the feeding pressure of the plunger pump 2 is 1.5-2.0MPa, and the sludge can be subjected to primary feeding pressure dehydration through the high-pressure feeding pressure of the plunger pump 2.
The electromagnetic force filter-pressing dehydration method for sewage sludge comprises the following steps:
dewatering in the first stage: a first current is introduced into an electromagnetic coil in the electromagnetic module, so that the generated electromagnetic force attracts a middle main filter plate and a middle auxiliary filter plate of the filter pressing chamber together, the filter pressing chamber is closed and limited, and the electromagnetic coil is powered off; injecting sewage sludge into a filter pressing cavity, enabling a middle main filter plate and a middle auxiliary filter plate in the filter pressing cavity to reach the maximum limiting distance, and realizing first-stage dehydration under the action of feeding pressure;
and (3) second stage dehydration: electrifying the electromagnetic coil in the electromagnetic module again, and introducing a second current, wherein the direction of the second current is the same as the current direction in the process of suction, the second current is larger than the first current, the second current is increased to increase the pressure between the middle main filter plate and the middle auxiliary filter plate, and the second stage of dehydration is realized through the electromagnetic suction force formed in the filter pressing chamber;
and (3) dehydrating in a third stage: when the current direction of the electromagnetic coil on the middle main filter plate and/or the middle auxiliary filter plate is changed, the attraction force is continuously kept between the filter plates of the filter pressing chambers, and the repulsion force is changed between the adjacent filter pressing chambers, so that the sludge is further squeezed and dewatered.
The electromagnetic filter-pressing dewatering device further comprises a first plate 28 and a tail plate 20, wherein the first plate 28 is located at the front end of the first filter-pressing cavity, a through hole for the high-pressure mud inlet pipe 1 to penetrate is formed in the first plate 28, and the tail plate 20 is located at the rear end of the last filter-pressing cavity.
The middle main filter plate 9 is provided with a main filter plate supporting plate frame 25, the two sides of the middle auxiliary filter plate 10, the main filter plate supporting plate frame 25, the first plate 28 and the tail plate 20 are respectively provided with a boss, the boss of the main filter plate supporting plate frame 25 is provided with a limiting rod 13 provided with a clamping groove, the middle auxiliary filter plate 10 is provided with a bolt mechanism 14, and when limiting is performed, a sliding block of the bolt mechanism 14 is inserted into the clamping groove of the limiting rod 13.
Electromagnetism filter-pressing dewatering device still includes rack support 4, rack 5 and screens mechanism, rack support 4 vertical fix on head plate 28, rack 5 fix on rack support to parallel with the filter-pressing direction, the end of rack 5 is fixed in the frame, screens mechanism install in on tail plate 20, pass through under the screens state screens mechanism is to the 5 screens of rack, and the tail plate can only be to head plate 28 one-way motion this moment. The filter pressing direction generally refers to the axial movement direction of the filter pressing chamber in the horizontal direction. In the second stage of dehydration, the clamping mechanism is clamped on the rack to enable the tail plate to move in a single direction, and meanwhile, the current of the electromagnetic coil is gradually increased to enable the pressure between the middle main filter press plate and the middle auxiliary filter press plate to be gradually increased; in the third stage of dehydration process, the blocking mechanism is blocked on the rack, so that the repulsion force between the adjacent filter pressing chambers can only push the filter plate to reduce the filter pressing chambers.
Screens mechanism includes screens sliding teeth 16, screens slide rail 17, sliding teeth reset spring 18 and sliding teeth driving electromagnet 19, screens sliding teeth 16 and rack 5 mutually support, and slide in the screens slide rail 17, sliding teeth reset spring 18 cover is located on the screens sliding teeth 16, through switching on and off the power supply of sliding teeth driving electromagnet 19 switches, realizes the state switching that breaks away from and the block of screens sliding teeth 16 and rack 5.
The bolt mechanism 14 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 block 14-5 and a limiting slide rail 14-6, wherein the limiting block electromagnetic iron core 14-1 is fixed on the limiting slide rail 14-6, the limiting block coil 14-2 is wound on the limiting block electromagnetic iron core 14-1, the sliding block 14-5 is arranged in the limiting slide rail 14-6 and is connected with the return spring 14-4, and meanwhile, the limiting block electromagnetic iron core 14-1 and the limiting block coil 14-2 generate magnetic attraction force on the sliding block 14-5 in a power-on state.
The bolt mechanism 14 further comprises a spring baffle 14-3, one side of the spring baffle 14-3 is abutted against the electromagnetic iron core 14-1, the other end of the spring baffle is connected with the return spring 14-4, and the other end of the return spring is connected with the sliding block 14-5.
The outer lane of middle main filter plate 9 open and to have the semicircle recess to be used for installing sealing washer 21, sealing washer 21 diameter ratio in the middle of main filter plate external diameter little, be equipped with on middle main filter plate 9 and the vice filter plate 10 in the middle of from inside to outside to be equipped with and strengthen lining 23 and filter cloth 24, vice filter plate 10 in the middle of, middle main filter plate 9, sealing washer 21, strengthen lining 23 and filter cloth 24 and constitute a changeable filter-pressing cavity of volume.
The upper parts of the middle main filter plate 9 and the middle auxiliary filter plate 10 are both provided with high-pressure air inlets and communicated with corresponding air inlet branch pipes 8, and high-pressure air can enter a filter pressing chamber through a high-pressure air pump, an air inlet main pipe, the air inlet branch pipes 8 and the high-pressure air inlets; the lower ends of the middle main filter plate 9 and the middle auxiliary filter plate 10 are both provided with liquid discharge through holes which are connected with a filter plate drainage branch pipe 26, and the drainage branch pipe 26 is communicated with a drainage main pipe; in the second stage of dehydration, after continuously squeezing for a period of time, introducing high-pressure gas into each filter pressing cavity by using a high-pressure gas pump, and blowing out the residual water and the water on the surface of the mud cake; in the third stage of dehydration process, the high-pressure air pump works, high-pressure air enters the high-pressure air inlet hole on the filter plate through the air inlet branch pipe to perform back flushing on the filter cloth tightly attached to the reinforcing lining, the high-pressure air blows away mud cakes tightly attached to the filter cloth and simultaneously blows away sludge particles adhered to the filter cloth to clean the filter cloth, and partial moisture in the sludge is taken away by the high-pressure air.
The electromagnetic force between the intermediate main filter plate 9 and the intermediate auxiliary filter plate 10 in the filter press chambers and the electromagnetic force between the adjacent filter press chambers can be arbitrarily switched between the repulsive force and the attractive force.
The filter pressing plate is made into a round shape, has good sealing performance, can be made into a square shape in special requirements, the inserting rod mechanism 14 is fixed on the middle auxiliary filter plate 10, and the limiting rods 13 are fixed on two sides of the main filter plate support plate frame 25.
The middle main filter plate 9 and the middle auxiliary filter plate 10 are provided with annular grooves, the upper half parts of the annular grooves are communicated with the air inlet branch pipes 8, and the lower half parts of the annular grooves are communicated with the filter plate drainage branch pipes 26, so that the water after filter pressing can flow to the filter plate drainage branch pipes 26, the flow rate of the water is accelerated by high-pressure gas, and the water on the surface of a mud cake is blown out at the same time. Middle vice filter plate 10, main filter plate supporting plate frame 25, head plate 28 and tailboard 20 both sides all have the boss, have gag lever post 13 on the boss of main filter plate supporting plate frame 25, the boss of middle vice filter plate 10 can be convenient for gag lever post 13 contact and closely cooperate with it, enhancement lining 23 fix on each filter plate, filter cloth 24 strengthen lining 23 parcel on the filter plate, main filter plate 9, vice filter plate 10, strengthen lining 23, filter cloth 24 central point put and all seted up into the mud hole for mud can follow into the mud hole and enter into next group of main vice filter-press board cavity in proper order, until all cavities all are full of mud. The boss of the middle auxiliary filter plate 10 is replaced by a dovetail groove, the limiting rod 13 is also made into a dovetail groove shape, and the axial limiting can be realized by matching the two.
The limiting block coil 14-2 is connected with the controller to receive a switch signal, the spring baffle 14-3 is fixed on the sliding rail 14-6, so that the reset spring 14-4 has enough stress area, the reset spring 14-4 is responsible for connecting the sliding block 14-5 and the sliding rail 14-6 and ensures that the sliding block 14-5 and the sliding rail 14-6 can restore to the original position after relative movement, the tail part of the sliding block 14-5 is made of magnetic material, when the limiting block coil 14-2 is electrified, the sliding block 14-5 and the sliding rail 14-6 generate relative movement, the reset spring 14-4 is compressed, and the front end of the sliding block extends out to clamp the limiting rod 13.
The hose 12 communicate adjacent filter-pressing cavity, install on the main vice filter plate of adjacent cavity, first board 28 and tailboard 20 also are connected with adjacent filter-pressing board through the hose simultaneously, it has satisfied that the filter-pressing board is when removing, all cavities still communicate although the distance changes between board and the board, electromagnet core 6, solenoid 7 install on two filter plates that the hose is connected, a plurality of pairs altogether, can realize attracting each other between the cavity, mutual repulsion outside the cavity, the middle main filter plate 9 and middle vice filter plate 10 between connect with spacing rope 31 for the hose can not be broken when the filter plate removes.
The upper ends of the middle main filter plate 9 and the middle auxiliary filter plate 10 are provided with high-pressure air inlets and connected with the air inlet branch pipes 8, the filter plates are provided with through holes, the high-pressure gas generator and the components comprise high-pressure air pumps, air inlet branch pipes 8 and air inlet main pipes, the air inlet branch pipes 8 are connected with hoses and can move along with the filter plates, high-pressure gas can enter a sludge filter pressing cavity through the high-pressure air pumps, the air inlet main pipes, the air inlet branch pipes 8 and the through holes, the lower ends of the main filter plate 9 and the auxiliary filter plate 10 are provided with liquid discharge through holes and connected with the filter plate drainage branch pipes 26, the drainage branch pipes 26 are connected with a drainage main pipe through hoses, and the tail.
The filter plate support lugs 22 are fixed on the middle auxiliary filter plate 10, the main filter plate support plate frame 25, the first plate 28 and the tail plate 20, and four support lugs 22 are arranged on each filter plate for fixing the filter plate on the frame.
The invention is also provided with a system controller 29 and a control bus 27 to realize automatic control of the system. The pneumatic ball valve 3 is connected with a system controller 29 to realize automatic opening and closing, and the electromagnetic coils 7, the sliding tooth driving electromagnetic coils 19 and the limiting block coils 14-2 on each filter plate are connected with the system controller 29 through a control bus 27.
The water outlet valve is an electromagnetic water outlet valve and can be opened and closed by an automatic controller. The sewage sludge dewatering and reducing device by means of electromagnetic force 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 dust removal device can be a cloth bag, a cyclone separator or the combination of the cloth bag and the cyclone separator.
The working principle of the device is as follows:
the initial state is not set to be that all chambers are opened, at the moment, a controller sends an instruction, the sliding teeth drive the electromagnet to be electrified to attract the clamping sliding teeth to be separated from the rack, meanwhile, the electromagnetic coil is electrified with a smaller current, as long as the electromagnetic force generated by the current can attract the main and auxiliary pressure filter plates together, after attraction, the coil of the limiting device is electrified, so that the limiting slide block extends out of the limiting slide rail to limit the moving distance of the limiting rod, then, the pneumatic ball valve starts to open the plunger pump to inject slurry into each pressure filter chamber, the main and auxiliary pressure filter plates move towards two sides under the pressure of the slurry, the pressure filter chambers gradually increase, the limiting slide block clamps the limiting rod when the maximum pressure is reached, the volume of the chambers is fixed, the relative position between the main and auxiliary pressure filter plates is fixed, the size of the pressure filter chambers is the initial volume of the sludge, and when all the chambers reach the, and the plunger pump is turned off after the certain time of pressure filtration by the plunger pump, and the mud inlet end pneumatic ball valve is closed. Under the action of feeding pressure, the pressure of the sludge is between 1.5 and 2.0MPa, the slurry is continuously pumped, water enters 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, after a period of feeding dehydration, the filter pressing cavity is filled to be full, the slurry cannot enter, a pneumatic ball valve is closed, the sludge feeding is stopped, and the first-stage feeding dehydration is finished.
Preparing the second stage of dehydration, then cutting off the power of the sliding tooth driving electromagnet, clamping the clamping sliding tooth on the rack to enable the clamping sliding tooth to move in a single direction, and simultaneously gradually increasing the current of the electromagnetic coil to enable the pressure between the main and auxiliary filter press plates to be gradually increased. Each chamber presses the sludge in the respective chamber by means of independent electromagnetic suction force, high-pressure air is blown into each filter pressing chamber by a high-pressure air pump after the sludge is continuously pressed for a period of time, and the residual water and the water on the surface of a mud cake are blown out, so that the second-stage pressing dehydration of the sludge is realized;
preparing the third stage of dehydration, the clamping sliding teeth and the rack play roles, the clamping sliding teeth always move towards the direction of the first plate along with the tail plate in the process of front filter pressing, the clamping sliding teeth can only move towards the direction of the first plate due to the structure, attraction force is continuously kept between filter pressing chambers when the current direction of an electromagnetic coil on the filter plate is changed, force between electromagnets between adjacent filter pressing chambers becomes repulsion force, sludge in the filter pressing chambers can be subjected to larger extrusion force, pressure and repulsion force, the repulsion force in the repulsion force can only push the filter plate to reduce the filter pressing chambers due to the existence of the clamping sliding teeth, the action of the repulsion force is greatly exerted, and sludge is further squeezed and dehydrated.
The controller controls the high-pressure air pump to work again, high-pressure air enters a high-pressure air inlet hole in the filter plate through the air inlet branch pipe and the through hole to perform back blowing on the filter cloth tightly attached to the reinforcing lining, the high-pressure air blows away mud cakes tightly attached to the filter cloth and simultaneously blows away sludge particles adhered to the filter cloth to clean the filter cloth, and the high-pressure air also carries away certain moisture in the sludge; in addition, when the mechanical pressing is carried out, high-pressure gas enters, more water which is difficult to remove in the sludge through the mechanical pressing is brought out in a steam mode, when the water outlet valve hardly discharges water, the pressing is stopped, and the whole dewatering process is finished.
Entering a mud unloading stage, powering off the inserted rod device after filter pressing is completed, retracting the inserted rod device into a limit slide rail through a reset spring limit slide block, driving an electromagnet to be electrified to attract the clamping slide tooth downwards to separate the clamping slide tooth from a rack, keeping a tail plate away from a head plate, correspondingly changing the current direction of each electromagnet between the filter plates to change the magnetic pole direction of each electromagnet, changing attraction force between filter pressing chambers into repulsion force, changing the force between the electromagnets between adjacent filter pressing chambers into attraction force, opening the filter pressing chambers, conveying sludge to a conveying mechanism below the device from a gap between the filter plates, keeping high-pressure gas blown in the process so that sludge blocks fall from the chambers and blow out residual water and water on the surfaces of the sludge cakes until the mud unloading is completed. In order to prevent their distance from affecting the next suction when the chamber is opened, it is therefore limited in distance by a flexible cord (one implementation of a limit cord). When the operation of one period is finished, each mechanism returns to the initial state again to prepare to enter the next cycle period, and the cycle operation is repeated.
The foregoing is illustrative of the preferred embodiments of the present invention only 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 which come within the scope of the invention as defined by the independent claims are intended to be embraced therein.
Claims (4)
1. A sewage sludge electromagnetic force filter-pressing dehydration method is based on a sewage sludge electromagnetic force filter-pressing dehydration device, the sewage sludge electromagnetic force filter-pressing dehydration device comprises a plurality of filter-pressing chambers, each filter-pressing chamber comprises a middle main filter plate (9) and a middle auxiliary filter plate (10), electromagnetic modules are arranged on the middle main filter plate (9) and the middle auxiliary filter plate (10), and the middle main filter plate (9) and the middle auxiliary filter plate (10) in the same filter-pressing chamber are mutually attracted through the electromagnetic modules; the adjacent filter pressing chambers are communicated through a hose (12), and the hose (12) is communicated with the high-pressure sludge inlet pipe (1); each electromagnetic module comprises an electromagnetic core (6) and an electromagnetic coil (7), and the electromagnetic coil (7) is wound on the corresponding electromagnetic core (6); the electromagnetic force filter-pressing dehydration method for sewage sludge comprises the following steps:
dewatering in the first stage: a first current is introduced into an electromagnetic coil in the electromagnetic module, so that the generated electromagnetic force attracts a middle main filter plate and a middle auxiliary filter plate of the filter pressing chamber together, the filter pressing chamber is closed and limited, and the electromagnetic coil is powered off; injecting sewage sludge into a filter-pressing chamber, enabling a middle main filter plate and a middle auxiliary filter plate in the filter-pressing chamber to reach the maximum limit distance, and realizing first-stage dehydration under the action of feeding pressure;
and (3) second stage dehydration: electrifying the electromagnetic coil in the electromagnetic module again, and introducing a second current, wherein the direction of the second current is the same as the current direction in the process of suction, the second current is larger than the first current, the second current is increased to increase the pressure between the middle main filter plate and the middle auxiliary filter plate, and the second stage of dehydration is realized through the electromagnetic suction force formed in the filter pressing chamber;
and (3) dehydrating in a third stage: when the current direction of the electromagnetic coil on the middle main filter plate and/or the middle auxiliary filter plate is changed, the attraction force is continuously kept between the filter plates of the filter pressing chambers, and the repulsion force is changed between the adjacent filter pressing chambers, so that the sludge is further squeezed and dewatered;
the electromagnetic force filter-pressing dehydration device further comprises a first plate (28) and a tail plate (20), wherein the first plate (28) is positioned at the front end of the first filter-pressing cavity, a through hole for the high-pressure mud inlet pipe (1) to penetrate through is formed in the first plate (28), and the tail plate (20) is positioned at the rear end of the last filter-pressing cavity;
the electromagnetic force filter-pressing dehydration device further comprises a rack support (4), a rack (5) and a clamping mechanism, wherein the rack support (4) is vertically fixed on the first plate (28), the rack (5) is fixed on the rack support and is parallel to the filter-pressing direction, the tail end of the rack (5) is fixed on the rack, the clamping mechanism is arranged on the tail plate (20), the rack (5) is clamped through the clamping mechanism in a clamping state, and the tail plate can only move in one direction towards the first plate (28);
in the second stage of dehydration, the clamping mechanism is clamped on the rack to enable the tail plate to move in a single direction, and meanwhile, the current of the electromagnetic coil is gradually increased to enable the pressure between the middle main filter plate and the middle auxiliary filter plate to be gradually increased; in the third stage of dehydration process, as the clamping mechanism is clamped on the rack, the repulsion force between the adjacent filter pressing chambers can only push the filter plate to reduce the filter pressing chambers;
be equipped with main filter plate supporting plate frame (25) on middle main filter plate (9), middle vice filter plate (10), main filter plate supporting plate frame (25), head plate (28) and tailboard (20) both sides all be equipped with the boss, have gag lever post (13) that are equipped with the draw-in groove on the boss of main filter plate supporting plate frame (25), be equipped with bolt mechanism (14) on middle vice filter plate (10), during the first stage dehydration spacing indicate: a sliding block of the bolt mechanism (14) is inserted into a clamping groove of the limiting rod (13);
the filter press is characterized in that a semicircular groove is formed in the outer ring of the middle main filter plate (9) and used for installing a sealing ring (21), the diameter of the sealing ring (21) is smaller than the outer diameter of the middle main filter plate, a reinforcing lining (23) and filter cloth (24) are arranged on the middle main filter plate (9) and the middle auxiliary filter plate (10) from inside to outside, and the middle auxiliary filter plate (10), the middle main filter plate (9), the sealing ring (21), the reinforcing lining (23) and the filter cloth (24) form a filter press chamber with variable volume;
the upper parts of the middle main filter plate (9) and the middle auxiliary filter plate (10) are both provided with high-pressure air inlets and communicated with corresponding air inlet branch pipes (8), and high-pressure air enters the filter pressing chamber through a high-pressure air pump, an air inlet main pipe, the air inlet branch pipes (8) and the high-pressure air inlets; the lower ends of the middle main filter plate (9) and the middle auxiliary filter plate (10) are respectively provided with a liquid discharge through hole which is connected with a filter plate drainage branch pipe (26), and the drainage branch pipe (26) is communicated with a drainage main pipe; in the second stage of dehydration, after continuously squeezing for a period of time, introducing high-pressure gas into each filter pressing cavity by using a high-pressure gas pump, and blowing out the residual water and the water on the surface of the mud cake; in the third stage of dehydration process, the high-pressure air pump works, high-pressure air enters the high-pressure air inlet hole on the filter plate through the air inlet branch pipe to perform back flushing on the filter cloth tightly attached to the reinforcing lining, the high-pressure air blows away mud cakes tightly attached to the filter cloth and simultaneously blows away sludge particles adhered to the filter cloth to clean the filter cloth, and partial moisture in the sludge is taken away by the high-pressure air.
2. The sewage sludge electromagnetic force filter-pressing dehydration method according to claim 1, characterized in that: the electromagnetic force between the middle main filter plate (9) and the middle auxiliary filter plate (10) in the filter pressing chamber and the electromagnetic force between the adjacent filter pressing chambers are switched between the repulsive force and the attractive force at will.
3. The sewage sludge electromagnetic force filter-pressing dehydration method according to claim 1, characterized in that: screens mechanism includes screens sliding tooth (16), screens slide rail (17), sliding tooth reset spring (18) and sliding tooth driving electromagnet (19), screens sliding tooth (16) and rack (5) mutually support, and slide in screens slide rail (17), sliding tooth reset spring (18) cover is located on screens sliding tooth (16), through the circular telegram and the outage of sliding tooth driving electromagnet (19) switch, realize the screens sliding tooth (16) and the state of rack (5) break away from with the block switch.
4. The sewage sludge electromagnetic force filter-pressing dehydration method according to claim 1, characterized in that: the bolt mechanism (14) comprises a limiting block electromagnetic iron core (14-1), a limiting block coil (14-2), a spring baffle (14-3), a reset spring (14-4), a sliding block (14-5) and a limiting sliding rail (14-6), the limiting block electromagnetic iron core (14-1) is fixed on the limiting sliding rail (14-6), the limiting block coil (14-2) is wound on the limiting block electromagnetic iron core (14-1), the sliding block (14-5) is arranged in the limiting sliding rail (14-6) and connected with the reset spring (14-4), and meanwhile, the limiting block electromagnetic iron core (14-1) and the limiting block coil (14-2) generate magnetic attraction force on the sliding block (14-5) in the power-on state.
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| CN201710410600 | 2017-06-03 | ||
| CN2017104106009 | 2017-06-03 |
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| CN108558163A CN108558163A (en) | 2018-09-21 |
| CN108558163B true CN108558163B (en) | 2020-04-28 |
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| CN201820159552.0U Expired - Fee Related CN208711143U (en) | 2017-06-03 | 2018-01-31 | A kind of sewage sludge electromagnetic force filter-press dehydration device |
| CN201810092339.7A Active CN107998707B (en) | 2017-06-03 | 2018-01-31 | Electromagnetic force filter pressing dewatering device for sewage and sludge |
| CN201810091869.XA Expired - Fee Related CN108558163B (en) | 2017-06-03 | 2018-01-31 | Electromagnetic force filter-pressing dehydration method for sewage sludge |
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| CN201820159552.0U Expired - Fee Related CN208711143U (en) | 2017-06-03 | 2018-01-31 | A kind of sewage sludge electromagnetic force filter-press dehydration device |
| CN201810092339.7A Active CN107998707B (en) | 2017-06-03 | 2018-01-31 | Electromagnetic force filter pressing dewatering device for sewage and sludge |
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| CN208711143U (en) * | 2017-06-03 | 2019-04-09 | 中国计量大学 | A kind of sewage sludge electromagnetic force filter-press dehydration device |
| CN108479146B (en) * | 2018-05-31 | 2023-12-22 | 苏州凯新分离科技有限公司 | Pipeline type sewage filtering device with electromagnet loading and unloading mechanism |
| CN109351005A (en) * | 2018-11-29 | 2019-02-19 | 杭州渗源环境科技有限公司 | A kind of plate and frame filter press |
| CN110104925A (en) * | 2019-06-11 | 2019-08-09 | 饶宾期 | Sludge dewatering and moisture content detecting method |
| CN110092561B (en) * | 2019-06-11 | 2023-09-08 | 深圳市浩瑞泰科技有限公司 | Sludge dewatering and water content detection device |
| CN111153545B (en) * | 2020-01-14 | 2022-07-05 | 中国石油天然气股份有限公司 | Electromagnetic separation treatment method for oil field measure waste liquid |
| CN113185080A (en) * | 2020-12-31 | 2021-07-30 | 第一环保（深圳）股份有限公司 | Tympanic membrane filter pressing plate for magnetic-thermal diaphragm airflow sludge dewatering and drying integrated equipment |
| CN112755623A (en) * | 2020-12-31 | 2021-05-07 | 陈张萍 | Rotary dewatering type solid-liquid separation filter pressing device |
| CN113384944B (en) * | 2021-06-30 | 2022-08-19 | 山东凤鸣桓宇环保有限公司 | Sewage filtering environmental protection equipment based on magnetic control filter screen deformation |
| CN114702223B (en) * | 2022-06-02 | 2022-08-09 | 山东祥龙新材料股份有限公司 | Sludge dewatering treatment device |
| CN115259605A (en) * | 2022-08-12 | 2022-11-01 | 李能军 | Sludge press filtration system for sewage treatment |
| CN115650550A (en) * | 2022-12-28 | 2023-01-31 | 邱县神龙印染有限责任公司 | Filter press for treating sewage generated in corduroy production and treatment process |
| CN117361833B (en) * | 2023-12-07 | 2024-02-13 | 潍坊山水环保机械制造有限公司 | Sewage treatment device |
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2018
- 2018-01-31 CN CN201820159552.0U patent/CN208711143U/en not_active Expired - Fee Related
- 2018-01-31 CN CN201810092339.7A patent/CN107998707B/en active Active
- 2018-01-31 CN CN201810091869.XA patent/CN108558163B/en not_active Expired - Fee Related
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| CN107998707A (en) | 2018-05-08 |
| CN107998707B (en) | 2023-08-15 |
| CN108558163A (en) | 2018-09-21 |
| CN208711143U (en) | 2019-04-09 |
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