CN114702217B

CN114702217B - Gas coupling type hydrodynamic cavitation device

Info

Publication number: CN114702217B
Application number: CN202210619457.5A
Authority: CN
Inventors: 李丕成; 赵奂; 赵迪; 李娜; 李学勤; 曹行春; 徐正强; 韩增伟; 王兆霖
Original assignee: Shandong Ams Environmental Co ltd
Current assignee: Shandong Ams Environmental Co ltd
Priority date: 2022-06-02
Filing date: 2022-06-02
Publication date: 2022-09-23
Anticipated expiration: 2042-06-02
Also published as: CN114702217A

Abstract

The invention discloses a gas coupling type hydrodynamic cavitation device, which relates to the technical field of sludge dehydration and specifically comprises an outer cylinder, an inner cylinder and a cavitation mechanism arranged in the outer cylinder, wherein the cavitation mechanism comprises a porous plate and a nozzle, and the inside of the nozzle is at least provided with a contraction section with a reduced sectional area. By introducing the hydrodynamic cavitation structural design, the invention improves the sludge dehydration performance by 10 to 20 percent or even higher than that of the conventional process, reduces the cost by 30 to 50 percent and improves the performance by 5 to 10 percent compared with the similar process, and organic matters which are difficult to biochemically degrade in the effluent are subjected to primary oxidative degradation; then, through the cavitation design such as baffle, the organic pollutant of further effective degradation play water, through cavitation device and gas coupling, can further promote sludge dewatering rate, the oxidation efficiency and the biochemical properties of play water.

Description

Gas coupling type hydrodynamic cavitation device

Technical Field

The invention relates to the technical field of sludge dewatering, in particular to a gas coupling type hydrodynamic cavitation device.

Background

The sludge is a semi-solid or solid substance generated in the sewage treatment process, enriches the main pollution components of the original sewage, contains pathogenic microorganisms, parasitic ova and some low-content toxic organic matters, has carcinogenicity and mutagenicity, and is extremely easy to cause secondary pollution to the environment and threaten human health once the sludge is not properly treated. However, with the increasing tightening of industrialization, urbanization and environmental protection policies, the scale of sewage treatment in China has increased rapidly in recent years, and the annual output of sludge has reached 60 Mt.

The research on sludge reduction is the key of sludge treatment, the wall breaking and dehydration of sludge are the primary factors for realizing sludge reduction, and the sludge treatment process commonly used in the market at present is as follows: the sludge concentration tank → the chemical conditioning tank → the plate-and-frame filter press has the following disadvantages: 1. chemical agents are introduced, so that secondary pollution is caused while the cost of the agents is increased; 2. the introduction of partial lime and other chemical agents reduces the water content of the plate frame effluent sludge to a certain extent, but increases the yield of the oven-dried sludge; 3. after the plate frame is adopted in the process, the water content of the sludge is as high as 75% or more, the increasingly strict environmental protection requirements cannot be met, and the aims of sludge reduction, stabilization and harmless treatment are not realized; 4. when the process is used for treating the sludge, the cost is higher: 5. the wastewater after sludge dehydration contains a large amount of organic matters which are difficult to biodegrade, and the conventional process returns the wastewater to a front-end biochemical system, so that the organic matters which are difficult to biodegrade form ineffective circulation in the system, are accumulated to a certain degree, cause the deterioration of the whole biochemical system, and cause burden on the whole sewage and sludge treatment system.

Disclosure of Invention

The invention aims to provide a gas coupling type hydrodynamic cavitation device, which firstly replaces a chemical conditioning tank in the prior art and is used for solving the problems of low dehydration rate, high energy consumption, high cost and secondary pollution in the prior sludge wall breaking dehydration technology; secondly, compared with the existing cavitation device, the invention can realize the improvement of sludge cavitation efficiency, can further degrade sludge water, optimize water quality and improve the biochemical degradation capability of sewage.

In order to realize the purpose of the invention, the invention adopts the following technical scheme:

the invention provides a gas coupling type hydrodynamic cavitation device, which comprises an outer cylinder, an inner cylinder and a cavitation mechanism arranged in the outer cylinder, wherein the cavitation mechanism comprises:

the porous plate is arranged in the inner cylinder and can reciprocate along the direction vertical to the central axis of the inner cylinder;

the nozzle is used for conveying the sludge and the gas into the inner cylinder, the nozzle is uniformly arranged on the inner cylinder along the circumferential direction of the inner cylinder, and can rotate in a reciprocating manner along the central axis of the nozzle when the porous plate reciprocates, and the inside of the nozzle at least has a contraction section with a reduced sectional area;

the water outlet is arranged on the inner barrel and is positioned above the porous plate;

and the blowdown assembly is arranged in the inner barrel and is used for periodically discharging sludge in the inner barrel.

Preferably, be provided with first annular bag on the inside wall of urceolus, and communicate through first branch pipe between first annular bag and the nozzle, the dredge pump is installed to the side of urceolus, and the exit end of dredge pump passes through discharging pipe and first annular bag intercommunication.

Preferably, the top of perforated plate is provided with the branch that runs through to the inner tube top, and the top of branch is provided with the roof, the bottom of roof is provided with the rack that is located the inner tube outside, cup joint on the nozzle with rack matched with gear.

Preferably, be provided with the fixed box that just aligns with the nozzle one-to-one on the outer wall of inner tube, and the inside of fixed box is provided with the piston, the top of piston is provided with and runs through to the fixed box outside and the connecting rod of being connected with the bottom of roof, the bottom of fixed box is provided with the connecting pipe that communicates with first branch pipe, and the inside of connecting pipe is provided with the check valve.

Preferably, a second annular bag is further arranged on the outer wall of the inner barrel, the second annular bag is communicated with the nozzle through a second branch pipe, a gas containing box is arranged between the outer barrel and the inner barrel, and the gas outlet end of the gas containing box is communicated with the second annular bag through a gas outlet pipe.

Preferably, the inside below that is located the perforated plate of inner tube is provided with the baffle, and has evenly seted up the interlude hole on the baffle, the bottom of perforated plate is provided with and runs through the interlude hole and extend to the interlude pole of baffle bottom.

Preferably, the central point department of putting of perforated plate bottom is provided with the pivot, and the outside of pivot evenly is provided with the puddler along its circumferencial direction, the inside of puddler is provided with two sets of holes along the direction symmetry of perpendicular to puddler, just the center department of hole has one section shrink section of contracting the sectional area and reducing, the longitudinal section of puddler is the rhombus.

Preferably, the blowdown subassembly is including setting up the funnel that is located the puddler below in the inner tube to and install the solenoid valve in funnel bottom opening part.

Preferably, the funnel is connected with the fixed block towards the one end of pivot, and inlays on the fixed block and have the ball, seted up the helicla flute in the pivot, and the ball is located the inside of helicla flute, still be provided with ultrasonic transducer in the pivot, still be provided with supersonic generator on the lateral surface of urceolus, electric connection between supersonic generator and the ultrasonic transducer.

Preferably, the cylinder is installed at the top of inner tube, and the output of cylinder is connected with the top of perforated plate.

Compared with the prior art, the above one or more technical schemes have the following beneficial effects:

1. when the sludge passes through the contraction section in the nozzle, the pressure is reduced, when the pressure is reduced to be lower than the vapor pressure of the liquid, the dissolved gas in the mobile phase can be gathered and released to generate a large amount of cavitation bubbles, the cavitation bubbles flow along with the fluid, in the process, if the pressure around the fluid is suddenly increased, the volume of the cavitation bubbles is rapidly reduced and collapsed until bursting, the bubbles generate local high temperature and high pressure at the moment of sudden collapse, and the extreme physical condition is enough to kill most microorganisms and destroy the cell walls. The water accounts for 70 percent of the microbial cells on average, and after the wall breaking by hydrodynamic cavitation, the surface adsorption water, pore water and internal water in the sludge can be separated from the sludge after subsequent centrifugal dehydration or filter pressing, so that the water content of the sludge and the sludge yield can be greatly reduced. Meanwhile, a large amount of hydroxyl free radicals with strong oxidation activity are generated, and the hydroxyl free radicals can perform oxidation reaction with organic matters or other reducing substances in the water solution, so that the degradation-resistant organic pollutants in the sludge can be subjected to ring-opening, chain scission and detoxification.

2. The invention can be lifted through the arranged perforated plate, the nozzles can rotate clockwise or anticlockwise through the meshing of the rack and the gear, so that the sludge sprayed out of the outlet of the nozzles is sprayed out in a rotating state, meanwhile, the rotating directions of every two nozzles which are symmetrical about the central axis of the inner cylinder are opposite, when one rotating nozzle sprays the sludge, the sludge sprayed out of the other rotating nozzle which is symmetrical to the rotating nozzle collides with the former through a jet flow which rotates in the opposite direction, the cavitation bubbles can be accelerated to generate the cavitation bubbles, the bubbles are quickly formed and broken, the released energy is enough to destroy the cell walls of microorganisms, further the sludge is cavitated, the dehydration rate of the sludge is further improved, and the broken chain of substances which are difficult to be biochemically degraded is realized.

3. Along with the lift of perforated plate, the puddler can go up and down and rotate, and because the longitudinal section of puddler is the rhombus, consequently no matter be the horizontal rotation of puddler, still the vertical displacement of puddler, the mud that is located near the puddler all can be extruded to the hole department because the rhombus structure of puddler, because the inside of hole also has one section shrink section, consequently, also can produce cavitation effect after the inside of sludge water entering hole, further promote the dehydration rate of mud and to the broken chain of difficult biochemical degradation material.

4. When the perforated plate rises to the highest position, water below the partition plate enters a cavity between the partition plate and the perforated plate through the through holes, and a cavitation effect is also generated when water flows through the through holes; and when the perforated plate descends, the interlude pole lapse will be gone through the hole shutoff again, make cavity volume between baffle and the perforated plate reduce gradually, and then make the inside rivers of cavity enter into the top of perforated plate and flow from the delivery port through the perforated plate, rivers produce cavitation effect once more when passing through the perforated plate, make sewage after the desliming receive dual cavitation's effect once more, further promote the water treatment effect, the organic pollutant of dehydration back water has effectively been degraded, waste water B/C can rise to some extent when the COD value descends, make backward flow water quality become the best.

In conclusion, the effective combination of the cavitation devices 1-3 can improve the sludge dewatering efficiency compared with the conventional process, does not need to introduce chemical agents, reduces the agent cost, avoids secondary pollution, reduces the yield of absolutely dry sludge, and has stable and reliable treatment process and small occupied area. Compared with the existing cavitation oxidation device, the sludge dewatering efficiency can be improved by 5-10%; the effective combination of the cavitation device 1-4 design can optimize the water quality of sludge water and enhance the biodegradability, and the existing chemical conditioning and cavitation oxidation device does not relate to the research in the field at present.

5. The invention can select whether to couple gas according to the treatment requirements of enterprises and places on sludge water, the commonly used gas is ozone or oxygen, when the muddy water mixture is sprayed out at high speed through the nozzle, negative pressure is formed near the nozzle, the gas and the muddy water mixture enter the main reactor together under the condition of negative pressure, the gas and the muddy water mixture are uniformly mixed and subjected to cavitation oxidation reaction, ozone with strong oxidation is injected into fluid through cavitation effect by taking the ozone as an example, pollutants in the water can be directly degraded, meanwhile, countless micro-bubbles with smaller size are formed in the fluid along with the collapse of the cavitation bubbles, the micro-bubbles float in the water along with the flow of the liquid, the contact time and the contact area of ozone gas and the liquid are increased, the mass transfer utilization efficiency of the ozone is greatly improved, the efficient utilization of the ozone is realized, and the synergistic action of hydrodynamic cavitation and the ozone is realized, further improves the dehydration efficiency of the sludge and plays a role in purifying the sludge water.

Aiming at the coupling of the cavitation oxidation device and the gas, compared with the independent cavitation oxidation device, the sludge dewatering efficiency can be further improved, and the sludge water quality can be further optimized. Compared with the conventional chemical process, the sludge dehydration rate can be improved by 10-20 percent or even higher; compared with the conventional cavitation oxidation device, the cavitation efficiency is improved by 5% -10%, the sludge water is optimized in water quality, the biochemical degradation capacity of sewage is improved, the water quality is changed from difficult biochemical treatment to biochemical treatment, the quality of return water is improved, the pollutants can be further treated through a biochemical system, salt and the like are not introduced in the process, and accumulation and ineffective circulation of the substances in the system are not caused.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a schematic view of the internal structure of the present invention;

FIG. 3 is a cross-sectional view taken at a-a of FIG. 2;

FIG. 4 is a schematic view of the construction of the stirring rod of the present invention;

FIG. 5 is a schematic view of the internal structure of the nozzle of the present invention;

FIG. 6 is a schematic view of the internal structure of the stirring rod of the present invention;

FIG. 7 is an enlarged view at A in FIG. 2;

FIG. 8 is a schematic view showing the internal structure of the fixing case of the present invention;

FIG. 9 is an enlarged view at B in FIG. 2;

in the figure:

1. an outer cylinder; 2. an inner barrel; 3. a perforated plate; 4. a nozzle; 5. a stirring rod; 501. a hole; 6. a cylinder; 7. a rotating shaft; 8. a funnel; 9. an electromagnetic valve; 10. a fixed block; 11. a ball bearing; 12. a helical groove; 13. a top plate; 14. a rack; 15. a gear; 16. a first annular bladder; 17. a first branch pipe; 18. a sewage pump; 19. a second annular bladder; 20. a gas containment box; 21. a fixing box; 22. a piston; 23. a connecting rod; 24. a connecting pipe; 25. a one-way valve; 26. a second branch pipe; 27. a partition plate; 28. inserting holes; 29. inserting the rod; 30. an ultrasonic transducer; 31. an ultrasonic generator.

Detailed Description

The invention is further described with reference to the following figures and examples.

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the invention. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

Referring to fig. 1-9, the present invention is mainly applied to biochemical sludge dewatering, and also applied to oxidative degradation of organic substances in advanced wastewater treatment, wherein the technical scheme of biochemical sludge dewatering includes: sludge concentration tank → gas coupling cavitation oxidation device → plate and frame filter press;

the invention focuses on a gas coupling cavitation oxidation device, and provides a gas coupling type hydrodynamic cavitation device, other devices or equipment are commercially available, wherein the gas coupling type hydrodynamic cavitation device comprises an outer cylinder 1, an inner cylinder 2 and a cavitation mechanism arranged in the outer cylinder 1, and the cavitation mechanism comprises:

the perforated plate 3 is arranged in the inner cylinder 2 and can reciprocate along the direction vertical to the central axis of the inner cylinder 2, the peripheral wall of the perforated plate 3 is closely connected with the inner side wall of the inner cylinder 2 in a sliding manner, a circle of sealing ring is arranged on the peripheral wall of the perforated plate 3, so that the sealing performance between the perforated plate and the inner wall of the inner cylinder 2 is improved, and naturally, if the sealing performance is not considered, the perforated plate 3 can reciprocate more smoothly through the mutual matching between the sliding block and the sliding groove;

the nozzle 4 is used for conveying sludge and gas into the inner barrel 2, the nozzle 4 is uniformly arranged on the inner barrel 2 along the circumferential direction of the inner barrel 2, when the porous plate 3 reciprocates, the nozzle 4 can rotate in a reciprocating manner along the central axis of the nozzle 4, at least one section of contraction section with a reduced sectional area is arranged in the nozzle 4, it needs to be noted that the sealing property between the nozzle 4 and the inner barrel 2 is good, and the longitudinal section of the nozzle 4 is circular, so that the sewage can not leak out from the connection part of the nozzle 4 and the inner barrel 2 due to the rotation of the nozzle 4, when the sludge passes through the contraction section in the nozzle 4, the pressure is reduced, when the liquid pressure in the sludge is smaller than the saturated vapor pressure, bubbles in the liquid can be expanded continuously, and the volume is increased; along with the movement of the fluid, after the bubbles reach a high-pressure and low-flow-rate area, the bubbles collapse and burst, huge energy can be released during rapid collapse, local high temperature and high pressure are generated at the moment of rapid collapse, and the extreme physical condition is enough to kill most microorganisms in the sewage and destroy cell walls of the microorganisms;

the water outlet is arranged on the inner cylinder 2 and is positioned above the porous plate 3, after the sludge is cavitated in the inner cylinder 2, the sludge sinks, the sewage floats upwards, and the sewage is cavitated by the porous plate 3 again when passing through the porous plate 3, so that the sewage is further cavitated, and the cavitation effect is improved again;

because 70% of microbial cells are water on average, after the wall breaking by hydrodynamic cavitation, surface adsorbed water, pore water and internal water in the sludge can be separated from the sludge after subsequent centrifugal dehydration or filter pressing, the water content of the sludge and the sludge yield can be greatly reduced, the dehydration rate of the sludge can be improved by 10% -20%, organic pollutants in a water body after dehydration can be effectively degraded, the COD value is reduced, and the B/C of the wastewater can be increased to some extent, so that the quality of the return water is improved;

the blowdown subassembly is located the inside of inner tube 2 to be used for regularly discharging the inside mud of inner tube 2, the mud after the emission is through treatments such as sheet frame filter-pressing again.

Please refer to fig. 2, fig. 3 and fig. 5, a first annular bag 16 is disposed on the inner sidewall of the outer cylinder 1, the first annular bag 16 is communicated with the nozzles 4 through a first branch pipe 17, a dredge pump 18 is installed on the side of the outer cylinder 1, and the outlet end of the dredge pump 18 is communicated with the first annular bag 16 through a discharge pipe, as can be seen from fig. 5, one end of the first branch pipe 17 extends to the inside of the nozzles 4 and is connected with the inner wall of the nozzles 4 in a sealed and rotatable manner, when the dredge pump 18 discharges the external sludge to the inside of the first annular bag 16 through the discharge pipe, the sludge can be sprayed out from the nozzles 4 through the first branch pipe 17, and the existence of the first branch pipe 17 can connect a plurality of nozzles 4 with one first annular bag 16, so that the sludge can be discharged from a plurality of nozzles 4 simultaneously by only one dredge pump 18.

Please refer to fig. 2 and 3, the top of the porous plate 3 is provided with a support rod penetrating to the top of the inner cylinder 2, the top of the support rod is provided with a top plate 13, the bottom of the top plate 13 is provided with a rack 14 positioned outside the inner cylinder 2, the nozzles 4 are sleeved with gears 15 matched with the rack 14, as can be seen from fig. 3, the rack 14 can be connected with a sliding rod, the other end of the sliding rod is connected with the outer peripheral wall of the inner cylinder 2 in a sliding manner so as to improve the stability of the rack 14, in addition, the number of the racks 14 is the same as that of the nozzles 4, and the two racks are in one-to-one correspondence, when the porous plate 3 is lifted or lowered, the nozzles 4 can rotate clockwise or counterclockwise by the meshing of the rack 14 and the gears 15, so that the sludge sprayed from the outlet of the nozzles 4 is sprayed out in a rotating state, and, as can be seen from fig. 3, when the racks 14 on every two nozzles 4 symmetrical by the axis of the inner cylinder 2 are lifted synchronously, the rotation directions of the gears 15 on the two nozzles 4 are opposite, and similarly, when the two racks 14 synchronously ascend, the rotation directions of the two gears 15 are still opposite, through the design, when one rotating nozzle 4 sprays sludge, the sludge sprayed by the other rotating nozzle 4 symmetrical to the rotating nozzle 4 collides with the former by virtue of the reversely rotating jet flow, cavitation bubbles generated by the cavitation bubbles can be accelerated, the bubbles are quickly formed and broken, the released energy is enough to destroy cell walls of microorganisms, and further cavitation is carried out on the sludge, so that the sludge is better in cavitation effect.

Please refer to fig. 2 and 8 again, the outer wall of the inner cylinder 2 is provided with a fixing box 21 corresponding to and aligned with the nozzles 4 one by one, a piston 22 is arranged inside the fixing box 21, the top of the piston 22 is provided with a connecting rod 23 penetrating to the outside of the fixing box 21 and connected with the bottom of the top plate 13, the bottom of the fixing box 21 is provided with a connecting pipe 24 communicated with the first branch pipe 17, a check valve 25 is arranged inside the connecting pipe 24, the fixing box 21 is further provided with a pipeline communicated to the outside, a check valve 25 is also arranged inside the fixing box 21, and when the check valve 25 inside the connecting pipe 24 is opened, the check valve 25 inside the pipeline is closed; when the pipe internal check valve 25 is opened, the check valve 25 inside the connection pipe 24 is closed; and when the perforated plate 3 rose, can make roof 13 rise, and then make connecting rod 23 drive piston 22 descend, piston 22 pours into the inside of nozzle 4 into through connecting pipe 24 with its inside gas (can be the air, also can pour into oxygen or ozone) inside (the inside check valve of connecting pipe 24 was in the open mode this moment), further promote the inside pressure of nozzle 4, make cavitation oxidation effect better, simultaneously solid-liquid gas homogeneous mixing, the introduction of gas further strengthens cavitation oxidation effect, ozone oxidation and cavitation oxidation effect are held, the effect is more obvious, realize the ring-opening of difficult degradation organic pollutant, chain scission, detoxify, finally realize sewage treatment target promotion quality of water.

Please refer to fig. 2 and 3, a second annular bag 19 is further disposed on the outer wall of the inner cylinder 2, the second annular bag 19 is communicated with the nozzles 4 through a second branch pipe 26, a gas containing box 20 is disposed between the outer cylinder 1 and the inner cylinder 2, and the gas outlet end of the gas containing box 20 is communicated with the second annular bag 19 through a gas outlet pipe, as can be seen from fig. 2, the plurality of nozzles 4 can be communicated with one second annular bag 19 through the second branch pipe 26, so that only one gas containing box 20 is needed to enable gas to enter the plurality of nozzles 4 simultaneously, furthermore, ozone or oxygen can be injected into the gas containing box 20 through the gas inlet pipe in advance, when the muddy water mixture is ejected through the nozzles at high speed, a negative pressure is formed near the nozzles, and under the negative pressure, the gas inside the gas containing box 20 is sucked into the nozzles 4 and enters the main reactor together with the muddy water mixture, the ozone is uniformly mixed and subjected to cavitation oxidation reaction, for example, the ozone with strong oxidizing property is injected into fluid through cavitation effect, pollutants in water can be directly degraded, meanwhile, along with the collapse of cavitation bubbles, the ozone forms countless micro bubbles with smaller size in the fluid, and the micro bubbles float in the water along with the flow of the liquid, so that the contact time and area of ozone gas and the liquid are increased, the mass transfer utilization efficiency of the ozone is greatly improved, the efficient utilization of the ozone is realized, and the synergy of hydrodynamic cavitation and the ozone further improves the dehydration efficiency of the sludge and plays a role in purifying the sludge water;

in addition, the equipment is adjusted according to the sludge treatment difficulty and the effluent sludge index requirement. Taking biochemical sludge treatment of a certain paper mill as an example, the on-site sludge dewatering process comprises the following steps: sludge concentration tank → chemical conditioning tank → plate and frame filter press. The gas coupling cavitation oxidation device provided by the invention replaces the existing chemical conditioning process. The following are comparisons of several conditions (taking biochemical sludge treatment in a certain paper mill as an example) as described in table one:

watch 1

After the field process dehydration, the COD value is about 600mg/L, and the BOD value is 0;

as can be seen from the table, after the device and the process are adjusted according to the enterprise requirements, compared with the traditional process (chemical conditioning process), the sludge dehydration rate is improved by 10-20 percent and higher; compared with the existing cavitation oxidation device, the cavitation effect can be improved by 5-10%.

The device can further treat the water body after sludge dehydration, and after the device is coupled with ozone by adopting a special structural design, the COD value of the water body after dehydration can be effectively reduced, the BOD value can be obviously improved, further biochemical degradation can be carried out, and ineffective circulation of organic matters which are difficult to be biochemically degraded in the whole system is avoided;

therefore, compared with the conventional chemical process, the device can improve the dehydration rate of the sludge by 10-20% or even higher, can effectively degrade organic pollutants in a water body after dehydration, can oxidize and break chains of the organic matters difficult to be biochemically degraded, can increase B/C (waste water) while the COD (chemical oxygen demand) value is reduced, enables the quality of the backflow water to be excellent, can further treat the pollutants after passing through a biochemical system, does not introduce salt and the like, and cannot cause accumulation and ineffective circulation of the substances in the system.

Please refer to fig. 2 and 9, the inner cylinder 2 is provided with a partition plate 27 below the porous plate 3, the partition plate 27 is provided with through holes 28 uniformly, the bottom of the porous plate 3 is provided with through rods 29 penetrating through the through holes 28 and extending to the bottom end of the partition plate 27, wherein, it should be noted that the partition plate 27 is fixed on the inner wall of the inner cylinder 2, so that the porous plate 3 can descend to the maximum extent only contacting the partition plate 27, and not driving the partition plate 27 to descend continuously, so that the porous plate 3 can ascend and descend without colliding with the nozzles 4, furthermore, the partition plate 27 can divide the inner cylinder 2 into an upper chamber and a lower chamber, the upper chamber is used as an auxiliary cavitation chamber, the lower chamber is used as a main cavitation chamber, specifically, as shown in fig. 9, after the porous plate 3 ascends to the highest position, the slope at the bottom end of the through rod 29 is located at the top end of the through hole 28, the through-holes 28 are in an open state at this time, water in the main cavitation chamber enters the cavity between the partition plate 27 and the porous plate 3 through the through-holes 28, and the through-holes 28 are horn-shaped openings with small upper parts and large lower parts, so that a cavitation effect is generated when water flows through the through-holes 28; and when the perforated plate 3 descends, the inserting rod 29 moves downwards to block the inserting hole 28, so that the volume of the cavity between the partition plate 27 and the perforated plate 3 is gradually reduced, and then the water flow in the cavity can enter the upper part of the perforated plate 3 through the perforated plate 3 and flow out from the water outlet, and because the caliber on the perforated plate 3 is also a horn-shaped opening with a small upper part and a large lower part, the cavitation effect can be further generated, and the water treatment effect is improved.

Please refer to fig. 2, 4, 6 and 7, the rotating shaft 7 is disposed at the center of the bottom of the perforated plate 3, the stirring rods 5 are uniformly disposed at the outer portion of the rotating shaft 7 along the circumferential direction, two sets of holes 501 are symmetrically disposed inside the stirring rods 5 along the direction perpendicular to the stirring rods 5, the center of the holes 501 has a contraction section with a reduced contraction section, the longitudinal section of the stirring rods 5 is diamond-shaped, in addition, one end of the funnel 8 facing the rotating shaft 7 is connected with a fixing block 10, the fixing block 10 is embedded with a ball 11, the rotating shaft 7 is disposed with a spiral groove 12, the ball 11 is disposed inside the spiral groove 12, when the perforated plate 3 is lifted, the rotating shaft 7 is lifted, because the spiral groove 12 is disposed on the rotating shaft 7, the ball 11 is embedded in the fixing block 10, and the ball 11 is disposed inside the spiral groove 12, when the rotating shaft 7 is lifted, under the mutual cooperation of the ball 11 and the spiral groove 12, the rotating shaft 7 can rotate to further drive the stirring rod 5 to rotate, and because the longitudinal section of the stirring rod 5 is rhombic, sludge near the stirring rod 5 can be extruded to the hole 501 due to the rhombic structure of the stirring rod 5 no matter the stirring rod 5 rotates transversely or the stirring rod 5 moves vertically, and because the inside of the hole 501 is also provided with a section of contraction section, the sludge can also generate a cavitation effect after entering the inside of the hole 501, so that the cavitation effect is further improved;

in addition, the rotating shaft 7 is further provided with an ultrasonic transducer 30, the outer side surface of the outer cylinder 1 is further provided with an ultrasonic generator 31, the ultrasonic generator 31 is electrically connected with the ultrasonic transducer 30, the power of the ultrasonic generator 31 is 400-500W, when the device is used, the ultrasonic generator 31 can be started, the ultrasonic transducer 30 distributed on the rotating shaft 7 induces ultrasonic cavitation, cavitation bubbles are generated through double functions of hydraulic cavitation and ultrasonic cavitation, instantaneous high pressure and high temperature are released through the cavitation bubbles in the processes of generation and collapse, a large amount of high-activity hydroxyl radicals generated under the conditions of high temperature and high pressure oxidize chemical substances in waste water, chemical bonds in molecules can be broken through the high temperature and high pressure, the purpose of degrading macromolecular organic substances is achieved, and the effect of degrading organic waste water is further improved.

Referring back to fig. 1 and 2, the sewage draining assembly includes a hopper 8 disposed inside the inner cylinder 2 and below the stirring rod 5, and a solenoid valve 9 installed at an opening at the bottom of the hopper 8, wherein when sludge inside the inner cylinder 2 needs to be drained, the solenoid valve 9 is opened so that no matter how far it can fall from the hopper 8, and then a sealing door on the outer cylinder 1 is opened for cleaning.

Please refer to fig. 1 and 2, the top of the inner cylinder 2 is installed with a cylinder 6, and the output end of the cylinder 6 is connected with the top of the porous plate 3, and the porous plate 3 is driven to ascend or descend by the arranged cylinder 6.

The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims

1. The utility model provides a gas coupling formula hydrodynamic cavitation device, includes urceolus (1), inner tube (2) and locates the inside cavitation mechanism of urceolus (1), its characterized in that, cavitation mechanism includes:

the perforated plate (3) is arranged in the inner cylinder (2) and can reciprocate along the direction vertical to the central axis of the inner cylinder (2);

the nozzles (4) are used for conveying sludge and gas to the inside of the inner barrel (2), the nozzles (4) are uniformly arranged on the inner barrel (2) along the circumferential direction of the inner barrel (2), the nozzles (4) can rotate back and forth along the central axis when the porous plate (3) reciprocates, and the inside of the nozzles (4) at least has a contraction section with a reduced cross section;

the water outlet is arranged on the inner cylinder (2) and is positioned above the porous plate (3);

the blowdown component is arranged inside the inner cylinder (2) and is used for periodically discharging sludge inside the inner cylinder (2);

the inner cylinder (2) is internally provided with a partition plate (27) below the porous plate (3), the partition plate (27) is uniformly provided with through holes (28), the bottom of the porous plate (3) is provided with through rods (29) penetrating through the through holes (28) and extending to the bottom end of the partition plate (27), the through holes (28) are horn-shaped openings with small top and large bottom, and the holes in the porous plate (3) are also horn-shaped openings with small top and large bottom;

the cylinder (6) is installed at the top of the inner cylinder (2), and the output end of the cylinder (6) is connected with the top of the porous plate (3).

2. The gas-coupled hydrodynamic cavitation device of claim 1, wherein: be provided with first annular bag (16) on the inside wall of urceolus (1), and communicate through first branch pipe (17) between first annular bag (16) and nozzle (4), dredge pump (18) are installed to the side of urceolus (1), and the exit end of dredge pump (18) passes through discharging pipe and first annular bag (16) intercommunication.

3. The gas-coupled hydrodynamic cavitation device of claim 2, wherein: the top of perforated plate (3) is provided with the branch that runs through to inner tube (2) top, and the top of branch is provided with roof (13), the bottom of roof (13) is provided with rack (14) that are located inner tube (2) outside, cup joint on nozzle (4) with rack (14) matched with gear (15).

4. The gas-coupled hydrodynamic cavitation device of claim 3, wherein: be provided with on the outer wall of inner tube (2) with nozzle (4) one-to-one and the fixed box (21) of aligning, and the inside of fixed box (21) is provided with piston (22), the top of piston (22) is provided with runs through to fixed box (21) outside and connecting rod (23) of being connected with the bottom of roof (13), the bottom of fixed box (21) is provided with connecting pipe (24) with first branch pipe (17) intercommunication, and the inside of connecting pipe (24) is provided with check valve (25).

5. The gas-coupled hydrodynamic cavitation device of claim 4, wherein: the outer wall of the inner barrel (2) is further provided with a second annular bag (19), the second annular bag (19) is communicated with the nozzle (4) through a second branch pipe (26), a gas containing box (20) is arranged between the outer barrel (1) and the inner barrel (2), and the gas outlet end of the gas containing box (20) is communicated with the second annular bag (19) through a gas outlet pipe.

6. The gas-coupled hydrodynamic cavitation device of claim 1, wherein: the central point of perforated plate (3) bottom puts the department and is provided with pivot (7), and the outside of pivot (7) evenly is provided with puddler (5) along its circumferencial direction, the inside of puddler (5) is provided with two sets of holes (501) along the direction symmetry of perpendicular to puddler (5), just the center department of hole (501) has one section shrink section of receiving the sectional area and reducing, the longitudinal section of puddler (5) is the rhombus.

7. The gas-coupled hydrodynamic cavitation device of claim 6, wherein: the blowdown subassembly is including setting up funnel (8) inside inner tube (2) and being located puddler (5) below to and install solenoid valve (9) in funnel (8) bottom opening part.

8. The gas-coupled hydrodynamic cavitation device of claim 7, wherein: funnel (8) are connected with fixed block (10) towards the one end of pivot (7), and inlay on fixed block (10) and have ball (11), spiral groove (12) have been seted up on pivot (7), and ball (11) are located the inside of spiral groove (12), still be provided with ultrasonic transducer (30) on pivot (7), still be provided with supersonic generator (31) on the lateral surface of urceolus (1), electric connection between supersonic generator (31) and ultrasonic transducer (30).