CN112851058A - Alternating-current voltage auxiliary belt type filter pressing equipment and sludge high-dryness dewatering method - Google Patents
Alternating-current voltage auxiliary belt type filter pressing equipment and sludge high-dryness dewatering method Download PDFInfo
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- 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
- C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
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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
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Abstract
The invention relates to an alternating voltage auxiliary belt type filter pressing device and a sludge high-dryness dehydration method, wherein the device comprises: the device comprises a hydraulic station, a first conveying belt, a second conveying belt, a first steel plate and a second steel plate; the first steel plate is arranged in the first conveying belt and is abutted against the first conveying belt; the second steel plate is arranged in the second conveying belt and abutted against the second conveying belt, and the first steel plate and the second steel plate are oppositely arranged; the output end of the hydraulic station is connected with the first steel plate, and the first steel plate and the second steel plate move relatively in order to apply pressure to the first steel plate; the first steel plate and the second steel plate are further connected with electrodes, so that an electric field is formed between the first steel plate and the second steel plate, and the advantages of electroosmosis and mechanical pressure are combined, so that the energy consumption can be reduced, and meanwhile, the moisture in the sludge is rapidly removed.
Description
Technical Field
The invention relates to the technical field of sludge dehydration treatment, in particular to an alternating-current voltage auxiliary belt type filter pressing device and a sludge high-dryness dehydration method.
Background
With the increasing importance of the country on sewage treatment and the continuous new construction of urban sewage treatment plants, the yield of sludge is continuously increased, and the rapid and effective treatment of sludge is not slow enough. The sludge has the characteristics of high water content, large pathogen content, high organic matter content and the like, and is easy to cause environmental pollution events.
The sludge treatment principle is to realize reduction, stabilization, harmlessness and recycling of sludge, wherein the sludge reduction is the key of subsequent treatment of sludge and the key point of sludge treatment. Among them, reducing the water content of sludge is a main way of sludge reduction. The sludge dewatering is characterized by simple and easy operation, easy realization and the like. Research shows that if the water content of the sludge is reduced from 99% to 60% -80%, the volume of the sludge can be reduced to 1/10-1/15 of the original volume, so that the cost of transporting the sludge outside is greatly reduced, and the difficulty of further treatment is reduced.
Chinese patent 202010585123.1 (an ultra-high pressure sludge deep dehydration equipment) provides an ultra-high pressure sludge deep dehydration equipment with high dehydration efficiency and high automation degree, which mainly relies on ultra-high pressure to remove water in sludge. The pressure of an oil pump reaches 63MPa, and the pressure level of a single oil cylinder is 400 tons/square meter. The extremely high pressures also place high demands on the material of the equipment, thereby greatly increasing the cost of the equipment, and the risk and difficulty of operation and maintenance. Meanwhile, the patent only needs to remove the moisture in the sludge by means of mechanical pressure, and the property of the sludge is not changed, so that the dehydration efficiency of the sludge is difficult to further improve.
The electroosmosis technology is introduced into the traditional dehydration technology, so that the dehydration and removal efficiency of the sludge can be greatly improved. Chinese patent 201210270508.4 (mechanical assisted electric dehydration device) provides a new type of mechanical assisted electric dehydration device for sludge dehydration, which combines electric dehydration with mechanical pressure to reduce the water content of sludge from about 86% to about 43% under the pressure of about 100 kPa. This patent has adopted accurate pressure monitoring unit for equipment structure is complicated, maintains the difficulty. Chinese patent 201811640338.8 (sludge treatment system and method combining electroosmosis high-dry dehydration and aerobic fermentation) discloses a sludge treatment system combining electroosmosis high-dry dehydration and aerobic fermentation and a method thereof, wherein the method combines the advantages of electroosmosis and aerobic fermentation, and further improves the dehydration efficiency of sludge. In the implementation, the sludge with the water content of 80 percent is reduced to a mud cake with the water content of about 60 percent under the pressure of about 1.2 MPa. The technology has the characteristics of simple operation of technical route, short construction period, low treatment and operation cost and good effect. However, the aerobic fermentation is adopted, so that the sludge dewatering period is prolonged, the high-temperature fermentation time is 15 days, and the secondary after-ripening time is 15-20 days, so that the treatment capacity per unit time is reduced, and the time cost is increased. Meanwhile, in the sludge dewatering stage, water is still removed by means of electroosmosis and mechanical pressure, the nature of the sludge is not changed, and bound water and capillary water in the sludge are difficult to further remove. In addition, application of a dc voltage to the sludge causes coking of the sludge near the electrode plates, which hinders further removal of water. In addition, the corrosion of the electrode plate by the direct current also affects the life of the electrode.
Although the theory and technology of sludge dewatering have been developed, sludge dewatering is still a major technical problem in sewage treatment engineering, and how to fully utilize the advantages of mechanical pressure and electroosmosis technology to develop a low-cost and high-efficiency sludge dewatering device to remove moisture in sludge to the maximum extent is a difficult problem in the existing sludge dewatering treatment technology.
Disclosure of Invention
The invention aims to provide an alternating-current voltage auxiliary belt type filter pressing device and a sludge high-dryness dehydration method, which combine the advantages of electroosmosis and mechanical pressure, reduce energy consumption and simultaneously rapidly remove water in sludge.
To achieve the above object, a first aspect of the present application provides an ac voltage-assisted belt type filter press apparatus comprising: the device comprises a hydraulic station, a first conveying belt, a second conveying belt, a first steel plate and a second steel plate;
the first steel plate is arranged in the first conveying belt and is abutted against the first conveying belt; the first conveying belt is fixed, so that the sludge is prevented from being adhered to the steel plate, and meanwhile, the corrosion to the steel plate in the electroosmosis process is reduced.
The second steel plate is arranged in the second conveying belt and abutted against the second conveying belt, and the first steel plate and the second steel plate are oppositely arranged;
the output end of the hydraulic station is connected with the first steel plate to apply pressure to the first steel plate, so that sludge between the first steel plate and the second steel plate is dewatered;
the first steel plate and the second steel plate are further connected with electrodes so as to form an electric field between the first steel plate and the second steel plate.
Optionally, the press filtration device further comprises: the blanking part, the frame part and the mud discharging part are connected in sequence;
the frame portion is provided with the first conveyor belt and the second conveyor belt.
Optionally, the press filtration device further comprises: an automatic deviation adjusting part;
the automatic deviation adjusting part is positioned in the frame body part and is positioned at the lower end of the frame body part;
the automatic deviation adjusting part comprises: the device comprises a bearing seat with a sliding block, an adjusting plate, a cylinder and a reinforcing rib;
one end of the air cylinder is connected with the bearing seat with the sliding block, and the other end of the air cylinder is connected with the reinforcing rib; the bearing seat with the sliding block is also connected with the adjusting plate.
Optionally, the press filtration device further comprises: a cleaning section;
the cleaning part comprises a water pipe;
one end of the water pipe is provided with a water pipe plug, and the water pipe is distributed with water spraying heads.
Optionally, a sludge water-containing sensor is further arranged at the sludge discharging part, and a sludge thickness measuring sensor is further arranged at the discharging part.
Optionally, the voltage of the alternating current electric field is controlled to be 10-15V, and the frequency is 50 Hz.
Optionally, the first steel plate and the second steel plate are both stainless steel plates, and the distance between the first steel plate and the second steel plate is 20mm-40 mm.
In order to achieve the above object, the second aspect of the present application provides a method for dewatering sludge with high dryness, which is applied to the filter pressing equipment of any one of the first aspect, and the method comprises:
adding the sludge with the original water content onto a second conveying belt of the filter pressing equipment;
controlling the second conveyer belt to run, wherein the first conveyer belt wraps the first steel plate, is fixed, and stops running after the sludge is fed between the first steel plate and the second steel plate;
applying a first pressure to the first steel plate for a preset first time period, and simultaneously applying a first alternating voltage before the first steel plate and the second steel plate so as to dewater the sludge;
applying a second pressure to the first steel plate within a preset second time period;
and after the second time period, releasing the second pressure to finish the dehydration of the sludge.
Optionally, after the second period of time elapses, the second pressure is released, and after the dewatering of the sludge is completed, the method further includes:
controlling the second conveying belt to operate so as to convey the dewatered sludge to a sludge outlet part;
and in the sludge discharging part, the sludge is crushed into particles.
Optionally, the second pressure is higher than the first pressure.
From top to bottom, the technical scheme that this application provided includes through setting up filter pressing equipment: the device comprises a hydraulic station, a first conveying belt, a second conveying belt, a first steel plate and a second steel plate; the first steel plate is arranged in the first conveying belt and is abutted against the first conveying belt; the second steel plate is arranged in the second conveying belt and abutted against the second conveying belt, and the first steel plate and the second steel plate are oppositely arranged; the output end of the hydraulic station is connected with the first steel plate to apply pressure to the first steel plate, so that sludge between the first steel plate and the second steel plate is dewatered; the first steel plate and the second steel plate are further connected with electrodes, so that an electric field is formed between the first steel plate and the second steel plate, and the advantages of electroosmosis and mechanical pressure are combined, so that the energy consumption can be reduced, and meanwhile, the moisture in the sludge is rapidly removed.
Specifically, the following technical effects can be achieved:
(1) the mechanical pressure and the electroosmosis technology are combined, so that gap water, most of capillary water and internal water in the sludge can be removed, and part of adsorbed water can be removed; the traditional electroosmosis effect depends on the migration of moisture under the action of an electric field to achieve the purpose of moisture removal; in the mechanical pressure stage, an alternating current electric field is adopted, so that the internal water of the sludge is dissociated, and the subsequent removal of water is facilitated; the conventional dehydration method combining mechanical pressure and electroosmosis applies mechanical pressure and electroosmosis to simultaneously act on sludge, and the dehydration method adopts a mode of dividing the mechanical pressure and the electroosmosis into steps, so that the advantages of the mechanical pressure and the electroosmosis are fully exerted, and the energy is saved.
(2) The voltage provided by the electrode can be set as alternating voltage, a direct current method adopted in the traditional electroosmosis can be changed, and an alternating current application mode is adopted, so that the surface coking phenomenon of the electrode 6 plate is avoided on one hand; on the other hand, the corrosion of the electrode is reduced, and the service life of the electrode is prolonged.
(3) The hydraulic station is arranged separately from the electrode, so that the safety and reliability are high. Specifically, the pressure supply unit (hydraulic station) and the electric dehydration unit (electrode) are self-systematized units, the applied mechanical pressure belongs to a conventional pressure range, and the applied alternating voltage is within a safe voltage; the cost of the equipment is greatly reduced, and the operation and maintenance are safer and simpler.
(4) No chemical agents are required. The traditional plate-frame dehydration technology is difficult to reduce the water content of the sludge to 60 percent, and agents such as PAC, ferric trichloride, quicklime and the like are required to be added; the electroosmosis dehydration technology has the advantages that the moisture content of wet sludge can be reduced to 50-60% under the condition of not adding any chemical agent, and the adverse effect of the chemical agent on fermentation microorganisms is avoided.
Drawings
FIG. 1 is a schematic structural diagram of an AC voltage auxiliary belt type filter press device provided in an embodiment of the present invention;
FIG. 2 is a top view of an AC voltage assisted belt filter press apparatus in accordance with an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a blanking portion of an AC voltage auxiliary belt type filter pressing device provided in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a mud discharging part of an AC voltage auxiliary belt type filter pressing device provided in the embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an automatic deviation adjustment device in an AC voltage auxiliary belt type filter press apparatus according to an embodiment of the present invention;
FIG. 6 is a schematic structural view of a cleaning part of an AC voltage auxiliary belt type filter pressing device provided in an embodiment of the present invention;
FIG. 7 is a flow chart of a method for dewatering sludge with high dryness according to an embodiment of the present invention.
In the figure, 1, a hydraulic station; 2. a first conveyor belt; 3. a second conveyor belt; 4. a first steel plate; 5. a second steel plate; 6. an electrode; 7. a support plate; 8. a drain pipe; 9. a blanking part; 91. a third steel plate; 92. a roller; 93. a base plate; 94. blanking a base plate; 95. a blanking box; 96. a first sprocket; 97. a motor; 10. a frame portion; 101. a bearing seat with a sliding block; 102. an adjusting plate; 103. a cylinder; 104. reinforcing ribs; 11. a mud discharging part; 111. a power roller; 112. a mud discharging roller; 113. a mud beating device; 114. a second sprocket; 115. a power motor; 116. a mud discharging motor; 117. a mud discharging motor frame; 12. a cleaning section; 121. a water pipe; 122. a water pipe plug; 123. a sprinkler head.
Detailed Description
The following examples are intended to illustrate the invention but are not intended to limit the scope of the invention.
Examples
Referring to fig. 1, the ac voltage auxiliary belt type filter pressing device provided by the invention specifically comprises the following structures: a hydraulic station 1, a first conveyor belt 2, a second conveyor belt 3, a first steel plate 4 and a second steel plate 5.
The hydraulic station 1 may be an oil hydraulic pump. The first steel plate 4 is arranged in the first conveying belt 2 and is abutted against the first conveying belt 2; the second steel plate 5 is provided in the second conveyor belt 3, abuts against the second conveyor belt 3, and the first steel plate 4 and the second steel plate 5 are provided at positions opposite to each other.
On the one hand, the output of the hydraulic station 1 is connected to the first steel plate 4 to apply pressure to the first steel plate 4, so that mechanical dewatering between the first steel plate 4 and the second steel plate 5 takes place.
On the other hand, the first steel plate 4 and the second steel plate 5 are further connected with electrodes 6 to form an electric field between the first steel plate 4 and the second steel plate 5, and sludge placed between the first steel plate 4 and the second steel plate 5 is mechanically dewatered by electro-osmosis.
In this embodiment, the first steel plate 4 and the second steel plate 5 are both stainless steel plates, and the distance between the first steel plate 4 and the second steel plate 5 is between 20mm and 40mm, that is, the thickness of the cake of the dewatered sludge is between 20mm and 40mm, which can be determined according to the time required for dewatering, the characteristics of the sludge, the requirement of the water content of the product, and the like. The larger thickness of the mud cake increases the dehydration time, and if the dehydration time is shortened, the water content of the product is increased.
In addition, in order to ensure the smooth and effective dehydration of the sludge in the electric field, the water content of the sludge placed on the second conveying belt can be controlled between 80 percent and 90 percent.
Further, the voltage of the alternating current electric field can be controlled between 10 and 15V, and the frequency is 50 Hz. Higher voltage can increase the motion power of the inside moisture of mud, shortens the dehydration time, reduces the product moisture content, but also increased the consumption of electric field electric energy simultaneously, and can aggravate the formation of positive pole coking.
Aiming at the mechanical pressure part, the mechanical pressure applied to the mud cake of the sludge for the first time is controlled within 1-1.5MPa, the moisture in the sludge is easy to remove at the stage, and the excessive pressure easily causes the waste of energy. During the second application of pressure, the pressure needs to reach about 20MPa, most of the water is removed in the stage, and more water can be further removed by high pressure.
In the technical scheme provided by the embodiment, the mechanical pressure and the electroosmosis technology are combined, so that interstitial water, most of capillary water and internal water in sludge can be removed, and part of adsorbed water can be removed; the traditional electroosmosis effect depends on the migration of moisture under the action of an electric field to achieve the purpose of moisture removal; in the mechanical pressure stage, an alternating current electric field is adopted, so that the internal water of the sludge is dissociated, and the subsequent removal of water is facilitated; the conventional dehydration method combining mechanical pressure and electroosmosis applies mechanical pressure and electroosmosis to simultaneously act on sludge, and the dehydration method adopts a mode of dividing the mechanical pressure and the electroosmosis into steps, so that the advantages of the mechanical pressure and the electroosmosis are fully exerted, and the energy is saved.
Further, in this embodiment, the voltage provided by the electrode 6 may be set as an alternating voltage, which can change the direct current method adopted in the conventional electroosmosis, and adopt the application mode of alternating current, on one hand, avoid the surface coking phenomenon of the electrode 6; on the other hand, the corrosion of the electrode 6 is reduced, and the service life of the electrode 6 is prolonged.
Further, since the hydraulic station 1 is provided separately from the electrode 6, high reliability and safety are provided. Specifically, the pressure supply unit (hydraulic station 1) and the electric dehydration unit (electrode 6) are self-organized units, the applied mechanical pressure belongs to a conventional pressure range, and the applied direct current voltage and alternating current voltage are both within a safe voltage; the cost of the equipment is greatly reduced, and the operation and maintenance are safer and simpler.
Furthermore, the technical scheme provided by the embodiment does not need chemical agents. The traditional plate-frame dehydration technology is difficult to reduce the water content of the sludge to 60 percent, and agents such as PAC, ferric trichloride, quicklime and the like are required to be added; the electroosmosis dehydration technology has the advantages that the moisture content of wet sludge can be reduced to 50-60% under the condition of not adding any chemical agent, and the adverse effect of the chemical agent on fermentation microorganisms is avoided.
In addition to the above embodiment, the second steel plate 5 may be provided with a drain hole, and when mechanical squeezing is performed on sludge between the first steel plate 4 and the second steel plate 5, moisture squeezed out of the sludge may flow out of the drain hole.
On the basis of the above embodiment, a support plate 7 and a drain pipe 8 may be further provided under the second steel plate 5. The supporting plate 7 is used for supporting the second steel plate 5, and the second steel plate 5 is kept in the original position under the extrusion action; the drain pipe 8 is used to drain away moisture flowing out of the drain hole.
On the basis of the above embodiment, referring to fig. 1 to 6, the press filtration apparatus further comprises: the blanking part 9, the frame part 10 and the mud discharging part 11 are connected in sequence;
the frame portion 10 is provided therein with a first conveyor belt 2 and a second conveyor belt 3.
Wherein, the blanking part 9 includes: a third steel plate 91, a roller 92, a backing plate 93, a blanking backing plate 94, a blanking box 95, a first chain wheel 96 and a motor 97.
The mud discharging part 11 includes: the device comprises a power roller 111, a mud discharging roller 112, a mud beating device 113, a second chain wheel 114, a power motor 115, a mud discharging motor 116 and a mud discharging motor frame 117.
On the basis of the above embodiment, the press filtration apparatus further comprises: an automatic deviation adjusting part;
wherein, the automatic deviation adjusting part is positioned in the frame part 10 and at the lower end of the frame part 10;
the automatic deviation adjusting part comprises: a bearing seat 101 with a slider, an adjusting plate 102, a cylinder 103 and a reinforcing rib 104;
one end of the air cylinder 103 is connected with the slider bearing seat 101, and the other end of the air cylinder 103 is connected with the reinforcing rib 104; the belt block bearing housing 101 is also connected to an adjusting plate 102.
On the basis of the above embodiment, the method further includes: a washing section 12; the washing section 12 includes a water pipe 121; a water pipe plug 122 is arranged at one end of the water pipe, and water spray heads 123 are distributed on the water pipe 121.
On the basis of the above embodiment, the sludge discharging part 11 is also provided with a sludge water-containing sensor, the blanking part 9 is also provided with a sludge thickness measuring sensor, the operation parameters such as sludge thickness, pressure application time, voltage and the like can be automatically adjusted through a PLC system, and the automatic operation can be realized after the operation parameters are set; in the operation process, according to the actual dehydration efficiency, the automatic adjustment can be carried out in a set range, so that the automation degree of the system is higher, and the operation is easier.
Referring to fig. 1 to 7, an embodiment of the present invention further provides a high-dryness sludge dewatering method, which is applied to any one of the filter pressing devices in the above embodiments, and the method specifically includes the following steps:
s1, adding the sludge with the original water content to the second conveyor belt 3 of the filter pressing device.
In this embodiment, in order to ensure effective dehydration of the sludge in the electric field, the original water content may be controlled between 80% and 90%, such as 85%.
And S2, controlling the second conveyor belt 3 to run, wherein the first conveyor belt 2 wraps the first steel plate 4 and is fixed for feeding the sludge between the first steel plate 4 and the second steel plate 5 and then stops running.
In this embodiment, while the second conveyor belt 3 is moving, the sludge may be conveyed between the first steel plate 4 and the second steel plate 5 to be dewatered by using the first steel plate 4 and the second steel plate 5.
S3, applying a first pressure to the first steel plate 4 for a first preset time period, and simultaneously applying a first ac voltage before the first steel plate 4 and the second steel plate 5 to dewater the sludge.
In this embodiment, the first pressure may be set to a medium pressure of 1-1.5MPa, and the first AC voltage may be set to a lower AC voltage, such as 10-15V, 50 Hz. The first time period may be set to 5-10 minutes.
In this example, the combination of mechanical pressure and electro-osmosis techniques can remove interstitial water, most of capillary water and internal water in the sludge, and part of the adsorbed water.
S4, applying a second pressure to the first steel plate 4 within a preset second time period;
wherein the second pressure is higher than the first pressure, e.g. the second pressure is set to 20 MPa. The second time period may be set to 10-15 minutes.
In the embodiment, the mechanical pressure applied to the mud cake for the first time is controlled within 1-1.5MPa, so that the moisture in the mud is easy to remove at the stage, and the waste of energy is easily caused by the overhigh pressure. During the second application of pressure, the pressure needs to reach about 20MPa, most of the water is removed in the stage, and more water can be further removed by high pressure.
And S5, releasing the second pressure after the second time period, and completing the dehydration of the sludge.
On the basis of the above embodiment, after step S5, the method further includes:
and S6, controlling the second conveyer belt 3 to operate so as to convey the dewatered sludge to the sludge outlet part 11.
S7, in the sludge discharging part 11, the sludge is crushed into particles.
The whole process is automatically controlled by a PLC control system.
Furthermore, a sludge water-containing sensor can be further arranged on the sludge discharging part 11, a sludge thickness measuring sensor is further arranged on the blanking part 9, and the sludge thickness, the pressure application time, the voltage size and the like are automatically adjusted through a PLC system, so that the automation degree of the system is higher, and the operation is easier.
In a specific example, the sludge with the original water content of 85 percent in a sewage treatment plant can be sent to the filter pressing device of the invention for dehydration. Specifically, the sludge can be input to the second conveyer belt 3 of the sludge filter pressing equipment through the blanking part 9; the sludge thickness is set to be 4 cm; under the drive of the second conveyer belt 3, the sludge is sent between the first steel plate 4 and the second steel plate 5; applying a pressure of 1.2MPa with a medium pressure on the first steel plate 4, and simultaneously directly applying a lower alternating voltage (10V, 50Hz) on the first steel plate 4 and the second steel plate 5 for 10 minutes; finally, the pressure is increased to about 18MPa, and the pressure is maintained for 10 minutes.
Compared with the conventional belt-type sludge filter-pressing equipment for dehydration, on the premise of using sludge raw materials, applying pressure and having the same operation time, the filter-pressing equipment provided by the embodiment of the invention has the advantages that the final water content of the sludge in the dehydration process is less than 50% in three times of sampling, and the total power consumption of the equipment is 50 kw.h. While the dehydration water content of the traditional belt type sludge filter pressing equipment is 68 percent, and the consumed power is 60 kw.h. Therefore, the technology is obviously superior to the traditional belt type sludge filter pressing equipment.
In yet another specific example, the sludge with 85% of the original water content of the sewage treatment plant can be sent to the filter pressing device of the invention for dewatering. Specifically, the sludge can be input to the second conveyer belt 3 of the sludge filter pressing equipment through the blanking part 9; the sludge thickness is set to be 3 cm; under the drive of the second conveyer belt 3, the sludge is sent between the first steel plate 4 and the second steel plate 5; applying a pressure of 1MPa with a medium pressure on the first steel plate 4, and simultaneously directly applying a lower alternating voltage (10V, 50Hz) on the first steel plate 4 and the second steel plate 5 for 10 minutes; finally, the pressure is increased to about 15MPa, and the pressure is maintained for 10 minutes.
Compared with the conventional belt-type sludge filter-pressing equipment for dehydration, on the premise of using sludge raw materials, applying pressure and having the same operation time, the final water content of the sludge in the filter-pressing equipment provided by the embodiment of the invention is less than 46% in three times of sampling, and the total power consumption of the equipment is 45 kw.h. While the dehydration water content of the traditional belt type sludge filter pressing equipment is 72 percent, and the consumed power is 65 kw.h. Therefore, the technology is obviously superior to the traditional belt type sludge filter pressing equipment.
In the description herein, references to the description of the term "in an embodiment," "in another embodiment," "exemplary" or "in a particular embodiment," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although the invention has been described in detail hereinabove by way of general description, specific embodiments and experiments, it will be apparent to those skilled in the art that many modifications and improvements can be made thereto based on the invention. Accordingly, such modifications and improvements are intended to be within the scope of the invention as claimed.
Claims (10)
1. An ac voltage assisted belt filter press apparatus comprising: the device comprises a hydraulic station, a first conveying belt, a second conveying belt, a first steel plate and a second steel plate;
the first steel plate is arranged in the first conveying belt and is abutted against the first conveying belt;
the second steel plate is arranged in the second conveying belt and abutted against the second conveying belt, and the first steel plate and the second steel plate are oppositely arranged;
the output end of the hydraulic station is connected with the first steel plate and is used for applying pressure to the first steel plate;
the first steel plate and the second steel plate are further connected with electrodes so as to form an electric field between the first steel plate and the second steel plate.
2. The pressure filtration device of claim 1, further comprising: the blanking part, the frame part and the mud discharging part are connected in sequence;
the frame portion is provided with the first conveyor belt and the second conveyor belt.
3. The pressure filtration device of claim 2, further comprising: an automatic deviation adjusting part;
the automatic deviation adjusting part is positioned in the frame body part and is positioned at the lower end of the frame body part;
the automatic deviation adjusting part comprises: the device comprises a bearing seat with a sliding block, an adjusting plate, a cylinder and a reinforcing rib;
one end of the air cylinder is connected with the bearing seat with the sliding block, and the other end of the air cylinder is connected with the reinforcing rib; the bearing seat with the sliding block is also connected with the adjusting plate.
4. The pressure filtration device of claim 2, further comprising: a cleaning section;
the cleaning part comprises a water pipe;
one end of the water pipe is provided with a water pipe plug, and the water pipe is distributed with water spraying heads.
5. The filter pressing equipment as claimed in claim 2, wherein a sludge moisture sensor is further arranged at the sludge outlet part, and a sludge thickness measuring sensor is further arranged at the blanking part.
6. The pressure filtration device according to claim 1, wherein the voltage of the alternating electric field is controlled between 10-15V and the frequency is 50 Hz.
7. The pressure filtration device of claim 1, wherein the first and second steel plates are both stainless steel plates and the spacing between the first and second steel plates is between 20mm and 40 mm.
8. A high-dryness sludge dewatering method applied to the filter pressing equipment as claimed in any one of claims 1 to 7, which is characterized by comprising the following steps:
adding the sludge with the original water content onto a second conveying belt of the filter pressing equipment;
controlling the second conveyer belt to run, wherein the first conveyer belt wraps the first steel plate, is fixed and is used for sending the sludge between the first steel plate and the second steel plate and then stops running;
applying a first pressure to the first steel plate for a preset first time period, and simultaneously applying a first alternating voltage before the first steel plate and the second steel plate so as to dewater the sludge;
applying a second pressure to the first steel plate within a preset second time period;
and after the second time period, releasing the second pressure to finish the dehydration of the sludge.
9. The dewatering method according to claim 8, further comprising, after said second period of time has elapsed, releasing said second pressure and completing dewatering of said sludge:
controlling the second conveying belt to operate so as to convey the dewatered sludge to a sludge outlet part;
and in the sludge discharging part, the sludge is crushed into particles.
10. The dewatering method of claim 8, wherein said second pressure is higher than said first pressure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011572918.5A CN112851058A (en) | 2020-12-24 | 2020-12-24 | Alternating-current voltage auxiliary belt type filter pressing equipment and sludge high-dryness dewatering method |
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| CN202011572918.5A CN112851058A (en) | 2020-12-24 | 2020-12-24 | Alternating-current voltage auxiliary belt type filter pressing equipment and sludge high-dryness dewatering method |
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