CN107670393A - A kind of Pressure Filter System of chemical industry slurry - Google Patents

A kind of Pressure Filter System of chemical industry slurry Download PDF

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Publication number
CN107670393A
CN107670393A CN201611166547.4A CN201611166547A CN107670393A CN 107670393 A CN107670393 A CN 107670393A CN 201611166547 A CN201611166547 A CN 201611166547A CN 107670393 A CN107670393 A CN 107670393A
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filter
chemical
belt
enters
filtrate
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CN107670393B (en
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王艳玮
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Baoying County Organic Food Quality Supervision And Inspection Center
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Qingdao University
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D36/00Filter circuits or combinations of filters with other separating devices
    • B01D36/04Combinations of filters with settling tanks
    • AHUMAN NECESSITIES
    • A61MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61LMETHODS OR APPARATUS FOR STERILISING MATERIALS OR OBJECTS IN GENERAL; DISINFECTION, STERILISATION, OR DEODORISATION OF AIR; CHEMICAL ASPECTS OF BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES; MATERIALS FOR BANDAGES, DRESSINGS, ABSORBENT PADS, OR SURGICAL ARTICLES
    • A61L2/00Methods or apparatus for disinfecting or sterilising materials or objects other than foodstuffs or contact lenses; Accessories therefor
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D36/00Filter circuits or combinations of filters with other separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D36/00Filter circuits or combinations of filters with other separating devices
    • B01D36/02Combinations of filters of different kinds
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B01PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01DSEPARATION
    • B01D2201/00Details relating to filtering apparatus
    • B01D2201/31Other construction details

Abstract

A kind of Pressure Filter System of chemical industry slurry, it includes 1 belt filter press, 1 chamber type filter, 1 pressing filter, 1 extruding filter, 1 bactericidal device, 1 settling tank, 1 waste liquid pool, 1 collecting tank, 4 solid-holding ponds, 3 surge tanks, 6 feed pumps, 5 Ge Huan roads devices and 15 valves, pressing filter includes motor, clutch, power transmission shaft, dispensing head, ball bearing, left end cap, outer barrel main body, seal cover board, seal spacer block, filter screen, inner cylinder main body, discharging tube, packing seal, right end cap, roller bearing, outer barrel bearing, support baseboard, it is collateral, discharge device for scraper, discharge box, reductor and lubricating arrangement.

Description

Chemical industry thick liquids's pressure filtration system
Technical Field
The invention belongs to a chemical separation system, and particularly relates to a pressure filtration system for chemical slurry.
Background
At present, the problems in the production process are as follows in the laggard production process of weak production technical strength of a chemical separation system, low automation degree of a production line, more manual operations, dispersed working procedures and poor working environment.
The existing separation system is single in type of chemical slurry, and pipelines can not be adjusted timely according to needs, so that different slurries can be processed; the separation system has low separation efficiency, low automatic control degree and low manual operation efficiency of operators; the adjustment and monitoring of some parameters in the production process mainly depend on the monitoring of experienced operators, so that the production information and the process data cannot be accurate and cannot be adjusted in time.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a chemical separation system which can allow a user to adjust a pipeline according to the requirement, uses multiple circulation and has more thorough filtration.
In order to achieve the purpose, the technical scheme of the invention is as follows: the utility model provides a chemical industry thick liquids's pressurization filtration system, its includes 1 belt filter press, 1 box filter, 1 pressure filter, 1 extrusion filter, 1 bacteria removing device, 1 sedimentation tank, 1 waste liquid pond, 1 collecting tank, 4 hold slag bath, 3 buffer tanks, 6 charge pumps, 5 way changers and 15 valves, its characterized in that: the sedimentation tank contains chemical industry slurry, the settled chemical industry slurry enters a belt filter press under the action of a first feeding pump through the bottom of the sedimentation tank, the belt filter press puts the filter-pressed chemical industry material into a first slag containing tank, the generated chemical industry filtrate enters a recovery main pipeline through a sixth feeding pump and a fourteenth valve and returns to the sedimentation tank, the upper part of the sedimentation tank is provided with a chemical industry filtrate outlet, the chemical industry filtrate enters a first route changer through a first valve and a second feeding pump, the first route changer is adjusted, the chemical industry filtrate enters a second route changer or a third route changer, the second route changer is adjusted, the chemical industry filtrate enters a waste liquid tank or enters a second valve, the chemical industry filtrate enters a box type filter after passing through the second valve and returns to the sedimentation tank, the box type filter puts the filtered chemical industry material into a second slag containing tank, chemical filtrate on the upper part of the box type filter enters a first buffer tank through a third valve, the chemical filtrate enters a third circuit breaker through a fourth valve under the drive of a third feeding pump after being buffered, the third circuit breaker is adjusted, the chemical filtrate enters a fifth valve or a fourth circuit breaker, the chemical filtrate enters an extrusion filter through the fifth valve, the chemical filtrate on the lower part of the extrusion filter enters a recovery main pipeline through a seventh valve and returns to a sedimentation tank, the extrusion filter puts the filtered chemical materials into a third slag containing tank, the chemical filtrate on the upper part enters a fourth commutator through an eighth valve, the fourth commutator is adjusted, the chemical filtrate enters a sterilizing device or the fifth commutator, the chemical filtrate on the bottom of the sterilizing device enters the fifth commutator through a thirteenth valve after being sterilized, the fifth commutator is adjusted, and the chemical filtrate enters the third buffer tank or a pressure filter, chemical filtrate in a third buffer tank enters a pressure filter through a fifth feeding pump and a twelfth valve, the pressure filter puts the filtered chemical materials into a fourth slag containing tank, the chemical filtrate at the bottom of the pressure filter enters a recovery main pipeline through an eleventh valve and returns to a sedimentation tank, the chemical filtrate at the upper part of the pressure filter enters a second buffer tank, the liquid in the second buffer tank is reusable chemical liquid, a part of chemical liquid enters a liquid collecting tank through the bottom of the second buffer tank, and a part of chemical liquid as flushing liquid returns to a box type filter, a pressure filter, an extrusion filter and a belt type filter press through a ninth valve, a tenth valve, a sixth valve and a fifteenth valve respectively through a fourth feeding pump so as to realize flushing of the box type filter, the pressure filter, the extrusion filter and the belt type filter press;
the pressure filter comprises a driving motor, a clutch, a transmission shaft, a distribution head, a ball bearing, a left end cover, an outer barrel main body, a sealing cover plate, a sealing spacer block, a filter screen, an inner barrel main body, a liquid discharge pipe, a filler seal, a right end cover, a roller bearing, an outer barrel support, a supporting bottom plate, a side branch, a scraper discharging device and a discharging box, wherein the driving motor is connected with the transmission shaft through the clutch, the transmission shaft is detachably connected with the inner barrel main body, the distribution head is arranged at one end of the inner barrel main body and is fixedly connected to the left end cover through a support and corresponds to each pipe orifice of the outer barrel main body, corresponding pipe orifices are distributed on the distribution head, two ends of the outer barrel main body are sealed by the left end cover and the right end cover, the sealing cover plate is arranged on the outer barrel main body, the sealing spacer block is arranged between the inner barrel main body and the outer barrel main body, the filter screen is arranged on the surface of the inner barrel main body, the filter screen is divided into a plurality of filter units by the wall surfaces of the circumferential unit and the radial unit by the supporting plate, the wall surfaces of the radial filter units are parallel to the central axis of the inner cylinder main body and form a certain angle therebetween, interchangeable unit filter plug-in components are arranged in the filter units, the filter units are provided with liquid discharge pipes, ring bodies are arranged on two sides of the inner cylinder main body, the outer parts of the ring bodies on two sides are respectively connected with a left end shaft and a right end shaft, the left end shaft and the right end shaft are respectively and fixedly connected with the inner rings of a ball bearing and a roller bearing, the outer rings of the ball bearing and the roller bearing are respectively and fixedly connected with a left end cover and a right end cover, the right end cover is provided with a feed inlet, the outer cylinder main body is connected with a supporting base plate through a side support structure on an outer cylinder support, a scraper discharge device is further arranged between the outer cylinder main body and the inner cylinder main body and is used for scraping materials on the filter units out and entering a discharge box, and the outer cylinder main body is provided with a filtrate outlet;
the pressure filter also comprises a speed reducer and a lubricating device, wherein the speed reducer is arranged between the driving motor and the clutch, the rated power of the speed reducer is 5Kw, the output torque is 50500Nm, and the lubricating device is a manual oil pump.
The invention has the beneficial effects that:
1. the processing and manufacturing of various chemical industry slurries are realized by using a plurality of filtering devices, a plurality of path changers and valves;
2. triple circulation is adopted, so that the waste liquid is filtered more thoroughly;
3. the automatic flushing of each filtering device is realized through the automatic flushing system;
4. monitoring the material level condition in real time to prevent fibrous and blocky materials from generating;
5. the gravity separation and the filter pressing separation are realized independently, and the gravity separation time is prolonged;
6. the deviation adjusting device combines the deviation adjusting and tensioning functions, so that each filter belt cannot fall off a roller and deviate, and the tensioning degree of each filter belt can be adjusted in real time;
7. the pressure filter has the advantages of large filtering pressure, good sealing performance, continuous operation, full-automatic operation, adoption of different operating pressures in different chambers and the like;
8. the fuzzy control reduces the waste in efficiency and the inaccuracy caused by the repeated modification of manual setting.
Drawings
FIG. 1 is a schematic view of a pressure filtration system for chemical slurries according to the present invention;
FIG. 2 is a schematic view of the belt filter press of the present invention;
FIG. 3 is a structural view of a press filter of the present invention;
FIG. 4 is a front view of the pressure filter of the present invention;
FIG. 5 is a side view of a pressure filter of the present invention;
FIG. 6 is a schematic diagram of the fuzzy controller of the present invention.
Detailed Description
The invention is further described with reference to the following figures and examples.
Embodiments of the present invention are illustrated with reference to fig. 1-6.
The utility model provides a chemical industry thick liquids's pressurization filtration system, its includes 1 belt filter press, 1 box filter, 1 pressure filter, 1 extrusion filter, 1 bacteria removing device, 1 sedimentation tank, 1 waste liquid pond, 1 collecting tank, 4 hold slag bath, 3 buffer tanks, 6 charge pumps, 5 way changers and 15 valves, its characterized in that: the sedimentation tank contains chemical industry slurry, the settled chemical industry slurry enters a belt filter press under the action of a first feeding pump through the bottom of the sedimentation tank, the belt filter press puts the filter-pressed chemical industry material into a first slag containing tank, the generated chemical industry filtrate enters a recovery main pipeline through a sixth feeding pump and a fourteenth valve and returns to the sedimentation tank, the upper part of the sedimentation tank is provided with a chemical industry filtrate outlet, the chemical industry filtrate enters a first route changer through a first valve and a second feeding pump, the first route changer is adjusted, the chemical industry filtrate enters a second route changer or a third route changer, the second route changer is adjusted, the chemical industry filtrate enters a waste liquid tank or enters a second valve, the chemical industry filtrate enters a box type filter after passing through the second valve and returns to the sedimentation tank, the box type filter puts the filtered chemical industry material into a second slag containing tank, chemical filtrate on the upper part of the box type filter enters a first buffer tank through a third valve, the chemical filtrate enters a third circuit breaker through a fourth valve under the drive of a third feeding pump after being buffered, the third circuit breaker is adjusted, the chemical filtrate enters a fifth valve or a fourth circuit breaker, the chemical filtrate enters an extrusion filter through the fifth valve, the chemical filtrate on the lower part of the extrusion filter enters a recovery main pipeline through a seventh valve and returns to a sedimentation tank, the extrusion filter puts the filtered chemical materials into a third slag containing tank, the chemical filtrate on the upper part enters a fourth commutator through an eighth valve, the fourth commutator is adjusted, the chemical filtrate enters a sterilizing device or the fifth commutator, the chemical filtrate on the bottom of the sterilizing device enters the fifth commutator through a thirteenth valve after being sterilized, the fifth commutator is adjusted, and the chemical filtrate enters the third buffer tank or a pressure filter, chemical industry filtrating of third buffer tank gets into pressure filter through fifth charge pump and twelfth valve, pressure filter puts into the fourth and holds the sediment pond with the chemical material after filtering, the chemical industry filtrating of pressure filter bottom gets into through the eleventh valve and retrieves the main line and return the sedimentation tank, the chemical industry filtrating on pressure filter upper portion gets into the second buffer tank, the liquid in the second buffer tank is repeatedly usable's chemical industry liquid, a part of chemical industry liquid gets into the collecting tank through the second buffer tank bottom, a part of chemical industry liquid passes through the ninth valve respectively as the flush fluid through the fourth charge pump, the tenth valve, the box filter is returned to sixth valve and fifteenth valve, pressure filter, extrusion filter and belt filter press, in order to realize the washing to box filter, pressure filter, extrusion filter and belt filter press.
The system uses the multiple filtering devices, so that the chemical filtrate is effectively filtered; a plurality of circuit changers and valves are arranged, so that a user can adjust the pipeline according to the requirement; the three-stage circulation of main filtration circulation, recovery circulation and back washing circulation is formed, so that the waste liquid is filtered more thoroughly, each filtering device can be automatically washed, and the situation that chemical materials block the device is prevented.
Wherein, the flocculating agent is contained in the sedimentation tank to ensure that the chemical pulp is easy to deliquor.
Wherein, the belt filter press comprises a frame, a gravity separation area, a squeezing separation area and a liquid guiding device, the gravity separation area, the squeezing separation area and the liquid guiding device are arranged on the frame, the gravity separation area comprises a feed inlet, a first driving motor, a first deviation adjusting device, a support roller and a filter belt, the squeezing separation area comprises a second driving motor, a third driving motor, a prepressing device, an upper filter pressing belt, a lower filter pressing belt, a tension roller, a discharge roller, a dewatering roller system, a support roller, a second deviation adjusting device and a third deviation adjusting device, chemical pulp to be subjected to liquid removal enters the gravity separation area through the feed inlet, most of chemical pulp is removed from the filter belt under the action of gravity, the first driving motor drives the support roller to rotate to drive the filter belt to circularly rotate, the first deviation adjusting device adjusts the running route of the filter belt through the deviation adjusting roller to enable the filter belt to be in a certain tensioning state and prevent the filter belt from falling off the roller, chemical pulp enters a squeezing separation area after passing through a gravity separation area, an upper filter press belt and a lower filter press belt are supported by a tension roller, a dewatering roller, a carrier roller and an unloading roller to form a squeezing separation area, a second driving motor and a third driving motor drive the unloading roller to realize continuous circular motion of the upper filter press belt and the lower filter press belt, the chemical pulp enters an opening formed by the upper filter press belt and the lower filter press belt, filter cakes are preliminarily formed under the action of two prepressing devices, the filter cakes further remove redundant chemical filtrate through a dewatering roller system to form chemical materials, the chemical materials enter a first slag containing pool after passing through the unloading roller, an upper filter press belt and a lower filter press belt are respectively arranged on a second deviation adjusting device and a third deviation adjusting device, the running route of the filter belts is adjusted through deviation adjusting rollers, so that the upper filter press belt and the lower filter press belt are in a certain tensioning state and are prevented from falling off the rollers, and the filtrate removed from the gravity separation area and the squeezing separation area enters a liquid guide device, and returning the chemical filtrate in the liquid guiding device to the sedimentation tank.
The traditional filter press can not realize independent control on gravity separation and filter-pressing separation, the belt filter press is provided with an independent gravity separation area, so that independent realization of gravity separation and filter-pressing separation is realized, and the independent gravity separation area can prolong the gravity separation time, thereby providing a working basis for the subsequent filter-pressing separation and effectively improving the filter-pressing effect; the deviation adjusting device combines the deviation adjusting function and the tensioning function, so that each filter belt cannot fall off a roller and deviate, and the tensioning degree of each filter belt can be adjusted in real time.
Wherein, the dewatering roll system includes 5 dewatering rolls, it will lay respectively in last filtration belt and lower filtration belt, will go up filtration belt and lower filtration belt extrusion coincide and form the S-shaped, wherein, first dewatering roll diameter is 500mm, is arranged in lower filtration belt, and second dewatering roll diameter is 400mm, is arranged in last filtration belt, and third dewatering roll diameter is 360mm, is arranged in lower filtration belt, and fourth dewatering roll diameter is 330mm, is arranged in last filtration belt, and fifth dewatering roll diameter is 220mm, is arranged in lower filtration belt.
The arrangement of the dewatering roll system can enable the filter cake to be extruded and sheared simultaneously, thereby enhancing the dewatering effect; the design of the diameter of 5 dewatering rolls realizes the gradient change of pressure, and prevents the phenomenon of slurry run-out caused by high water content of the slurry in the initial stage while effectively performing filter pressing on a filter cake.
Wherein, the upper filter pressing belt and the lower filter pressing belt are made of polyester materials and adopt a twill weave method.
The adhesion of the polyester material is 2.1N/m 2 The filter belt made of polyester material has small adhesion to filter cake, so that the belt press filter can work continuously and effectively.
Wherein, be provided with a plurality of sprinkler heads on the upper portion of last filter-pressing area upper surface, wash the filter-pressing area, be provided with a plurality of sprinkler heads in the lower part of filter-pressing area lower surface down, wash the filter-pressing area down, the use of sprinkler head is that the flush fluid sprays, and chemical industry filtrating after washing gets into the drain device.
The spraying device realizes the automatic cleaning of the upper and lower pressing filter belts and prevents the filter belts from being damaged.
The box-type filter is formed by stacking a plurality of filter boxes, a spray pipe, a movable plate, a filter plate, a fixed plate, a rack and a transmission device are arranged in each filter box, the spray pipe is arranged on the upper portion of each filter box, a plurality of nozzles are arranged on the spray pipe and spray flushing liquid to the filter plate, the filter plate is provided with a plurality of movable plates, the filter plates and the fixed plates are arranged in the filter boxes from top to bottom, the movable plates and the filter plates are arranged on guide rails of the rack, the fixed plates are fixedly arranged at the bottom of the rack, the filter screens are arranged on the filter plates, the movable plates and the filter plates are connected through the transmission devices to further realize linkage of the filter plates, the movable plates move towards the fixed plates under the driving of the transmission devices and extrude the filter plates, in the operation process, the intervals between the filter plates are equal, the filter boxes are sealed in metal contact, contact surfaces between the filter boxes are deformed through certain external pressure, and accordingly the contact surfaces are tightly attached and fluid is prevented from passing through.
Wherein, the box filter comprises three filter boxes in a stacked manner, and the filter boxes are internally provided with filter aid.
Wherein, spray tube evenly distributed has a plurality of orifices, spouts the flush fluid to mix with the filter aid, under the effect of gravity and pressure, the mixed liquor flows to the exit of filter box through the filter plate.
Wherein, be provided with the pressure gauge on every filter box to the pressure of measurement filter box avoids the emergence of leaking.
Wherein, whether the filter plate works normally is judged according to the effective filtering area of the filter plate, the effective filtering area A of the filter plate is calculated by the following formula,
in the formula, W is the mass of chemical filtrate filtered per hour, gamma filtration speed reliability coefficient, C is experimental filtration speed, T is working time, and F is filtration utilization coefficient;
the effective filtering ratio delta is calculated,
in the formula, A 0 The overall area of the filter plate;
when the angle is more than 0.3 and less than or equal to 0.6, the filter plate needs to be cleaned;
when delta is less than or equal to 0.3, the filter plate needs to be replaced.
Wherein, the power P of the transmission device is obtained by the following formula calculation according to the comparison between the power P of the transmission device and the current driving power to judge whether the current transmission device works normally,
wherein V is the moving speed of the movable plate, q is the unit length weight of the transmission chain of the transmission device, Λ is the center distance of chain wheels at two ends of the transmission device, ω is the motion resistance coefficient of the chain, G is the weight of the filter plate, μ is the transmission efficiency of the transmission device, and η is m The coefficient of friction of the movement of the filter plate.
The extrusion filter comprises a water spraying pipe, a cylindrical shell, a screw rotary vane, a driving motor and a convergence plate, wherein a liquid discharging hole is formed in the middle of the cylindrical shell, the water spraying pipe is arranged at the top in the middle of the cylindrical shell, the water spraying pipe is provided with a plurality of spray heads and used for spraying flushing liquid to the cylindrical shell, the liquid discharging hole in the cylindrical shell is flushed, the liquid discharging hole is prevented from being blocked, a discharge port and a feed port are formed in two ends of the cylindrical shell, the driving motor is arranged at one end of the discharge port, the discharge port is provided with a baffle plate and a moving ring net, the moving ring net comprises a fixed ring piece and a moving ring piece, the fixed ring piece and the moving ring piece are mutually spaced and have a certain filtering gap, the moving ring piece eccentrically moves at a certain track under the pushing of the screw rotary vane, and the chemical filtrate is extruded through the relative movement between the moving ring piece and the fixed ring piece, so that the filtering separation effect of the material is improved, the total two convergence plates are arranged at the bottom in the middle of the cylindrical shell, two convergence plates have certain inclination and form a liquid outlet, and the chemical filtrate is collected and discharged.
The pressure filter comprises a driving motor, a clutch, a transmission shaft, a distribution head, a ball bearing, a left end cover, an outer barrel main body, a sealing cover plate, a sealing spacer block, a filter screen, an inner barrel main body, a liquid discharge pipe, a filler seal, a right end cover, a roller bearing, an outer barrel support, a supporting bottom plate, a side branch, a scraper discharging device and a discharging box, wherein the driving motor is connected with the transmission shaft through the clutch, the transmission shaft is detachably connected with the inner barrel main body, the distribution head is arranged at one end of the inner barrel main body and is fixedly connected to the left end cover through a support and corresponds to each pipe orifice of the outer barrel main body, corresponding pipe orifices are distributed on the distribution head, two ends of the outer barrel main body are sealed by the left end cover and the right end cover, the sealing cover plate is arranged on the outer barrel main body, the sealing spacer block is arranged between the inner barrel main body and the outer barrel main body, the filter screen is arranged on the surface of the inner barrel main body, the filter screen is cut apart into a plurality of filter unit by circumference and radial unit wall by the backup pad, radial filter unit's wall and inner tube main part center pin parallel and between become certain angle, there is interchangeable unit filtration plug-in components in filter unit, the last fluid-discharge tube that is equipped with of filter unit, the ring body is installed to inner tube main part both sides, both sides ring body outside is connected with left end axle and right-hand member axle respectively, left end axle and right-hand member axle respectively with ball bearing and roller bearing's inner circle fixed connection, ball bearing and roller bearing's outer lane respectively with left end lid and right-hand member lid fixed connection, the right-hand member lid is opened and is equipped with the feed inlet, the urceolus main part is connected with the supporting baseplate through lateral structure on the urceolus support, still be provided with scraper discharge apparatus between urceolus main part and the inner tube main part, it scrapes out the material on the filter unit and gets into the dump box, the urceolus main part is provided with the filtrating discharge port.
The pressure filter has the advantages of large filtering pressure, good sealing performance, continuous operation, full-automatic operation, adoption of different operating pressures in different chambers and the like.
The inner cylinder main body, the filter screen, the distribution head, the liquid discharge pipe, the scraper discharging device and the discharging box of the pressure filter, which are in contact with chemical materials, are made of corrosion-resistant stainless steel materials, and the transmission shaft, the ball bearing, the left end cover, the outer cylinder main body, the sealing cover plate, the sealing spacer block, the packing seal, the right end cover, the roller bearing, the outer cylinder support, the supporting bottom plate and the side branch, which are not in contact with the chemical materials, are made of carbon steel materials.
The pressure filter also comprises a speed reducer and a lubricating device, wherein the speed reducer is arranged between the driving motor and the clutch, the rated power of the speed reducer is 5Kw, the output torque is 50500Nm, and the lubricating device is a manual oil pump.
The system also comprises a main control computer and a sensor, wherein the main control computer receives signals from the sensor and controls the on-off of 15 valves, the selection of 5 loop devices, the running power of 6 feeding pumps, the driving power of a transmission device of the box type filter, the working voltage of 3 driving motors of the belt type filter press, the working voltage of a driving motor of the extrusion filter and the working voltage of a driving motor of the compression filter through a bus.
The sensor comprises a rotating speed sensor, a flow rate sensor, a pressure gauge, a vibration sensor and a noise sensor, wherein the rotating speed sensor is arranged on a driving motor of the belt filter press, the extrusion filter and the compression filter and is used for measuring the rotating speed of the driving motor, the speed sensor is arranged on a movable plate of the box filter and is used for measuring the moving speed of the speed sensor, a filtrate outlet of the box filter of the flow rate sensor and is used for detecting the flow rate of filtrate, the pressure gauge is arranged on a filter box of the box filter and an outer cylinder body of the compression filter and is used for measuring pressure, and the vibration sensor and the noise sensor are arranged on a cylindrical shell of the extrusion filter and the outer cylinder body of the compression filter and are used for measuring mechanical vibration signals and noise signals of the extrusion filter and the compression filter.
The main control computer is provided with a fuzzy control device and a processor, the fuzzy control device comprises a differentiator, a fuzzification interface, an output quantity conversion module, a reasoning machine and a knowledge base, a rotating speed sensor provides the measured rotating speed of a driving motor of the belt filter press, the extrusion filter and the pressurization filter to the differentiator, the differentiator subtracts the set rotating speed input by an operator from the measured rotating speed to obtain an error value E, the error value E obtains an error change rate dE/dt through the differentiator, the error value E and the error change rate dE/dt are provided to the fuzzification interface, fuzzification assignment is carried out on the error value E and the error change rate dE/dt to respectively obtain a fuzzification error value ME and a fuzzification error change value MEC, the fuzzification error value ME and the fuzzification error change value MEC are provided to the reasoning machine, the reasoning machine carries out fuzzy reasoning on the fuzzification error value ME and the fuzzification error value MEC according to the input and output membership value in the knowledge base and a logic reasoning rule, the fuzzification error value ME and the fuzzification error value MEC are provided to the actual control quantity U, the output by the output conversion module, and the MU is provided to the working voltage for the driving motor.
The fuzzy control device is a programmable logic controller, and RS232 communication is adopted between the programmable logic controller and a processor of the main control computer.
The fuzzification assignment process specifically comprises the following steps: selecting parameters PL, PB, PM, PS, ZO, NS, NM, NB and BL according to linguistic variables of an operator, wherein the parameters respectively represent positive oversize, positive center, positive small, zero, negative small, negative center, negative large and negative oversize, and a corresponding fuzzy set { -n, -n +1,. 9.. 9., 0,. 9.. Once.., n-1,n }, and n =4;
determination of the quantization factor, k e = n/e, wherein k e Is the error value quantization factor, e is the measured maximum error value, k ec =n/ec,k ec Is the error rate quantization factor, ec is the measured maximum error rate,
if m is less than or equal to k e E≤m+1,m&N, the fuzzification error value ME is rounded k e E;
If k is e E&N, the fuzzification error value ME is-n;
if k is e E&N, the fuzzification error value ME is n;
if m is less than or equal to k ec E≤m+1,m&N, the variation value MEC of the blurring error is k after rounding ec E;
If k is ec E&N, the variation value MEC of the fuzzification error is-n;
if k is ec E&And gt, n, the variation value MEC of the fuzzification error is n.
Wherein the knowledge base comprises a database and a rule base,
the fuzzy membership vector values of the input variables and the output variables are stored in the database, the vector values are a set of corresponding values of the input variables and the output variables after discretization through corresponding domains and the like, if the corresponding domains are continuous, the corresponding domains can be used as membership functions, for the input fuzzy variables, the membership functions are stored in the database, and data are provided for an inference engine in a fuzzy inference relationship.
The rule base stores fuzzy rules, which are formed on the basis of long-term accumulated experience of operators and expert knowledge and are expressed by related vocabularies of logical relations, such as if-then, else, end, and, or and the like.
The rapid setting of the parameters can be automatically and effectively realized through fuzzy control, and the waste on efficiency and the inaccuracy of precision caused by repeated modification of manual setting are reduced.
The outer barrel body of the pressure filter is uniformly and alternately provided with N vibration sensors and N noise sensors in the circumferential direction, the vibration sensors mechanically collect vibration signals, the noise sensors collect noise signals, and the material level in the outer barrel body of the pressure filter is judged through the mechanical vibration signals and the noise signals.
The specific steps of judging the material level in the outer cylinder body of the pressure filter through the mechanical vibration signal and the noise signal are as follows:
step 1, filtering N collected mechanical vibration signals and N collected noise signals, removing useless signals, and obtaining N mechanical vibration signal curves and N collected noise signal curves;
step 2, fitting the N mechanical vibration signal curves and the N noise signal curves to obtain the ith mechanical vibration frequency function f iz And ith noise frequency function f ic
Step 3, calculating an average mechanical vibration frequency function f z And average noise frequency function f c ,i=1,2,......,N;
And 4, calculating the sound level,
wherein L is sound level intensity, t is time, e is the base number of a natural logarithmic function, lg is a logarithmic function, F () is an impact force function between materials, and H e () As a function of structural responseA is the sound level weighting coefficient, σ rad Coefficient of acoustic radiation, eta s Is an internal damping coefficient, d is the average thickness of the outer cylinder body of the pressure filter, and Re represents the real part of a plurality of values;
step 5, drawing a curve of the sound level intensity L, extracting an envelope signal, forming an envelope curve, performing down-sampling processing on the envelope signal, and performing data compression;
step 6, performing low-frequency reconstruction on the compressed data to obtain a low-frequency reconstruction signal;
and 7, comparing the low-frequency reconstruction signals with pre-measured low-frequency reconstruction signals respectively at 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% material levels through the trained three-layer BP neural network, and outputting real-time material level information of the outer cylinder body of the pressure filter.
The material level of the outer cylinder body of the pressure filter is a macroscopic parameter, the material level change condition of the extrusion filter or the pressure filter is accurately grasped in real time, and the method is very important for controlling the load of the extrusion filter or the pressure filter, preventing fibrous and blocky materials from generating and stabilizing the operation of the whole system.
The above-described embodiment merely represents one embodiment of the present invention, but is not to be construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention.

Claims (10)

1. The utility model provides a chemical industry thick liquids's pressurization filtration system, its includes 1 belt filter press, 1 box filter, 1 pressure filter, 1 extrusion filter, 1 bacteria removing device, 1 sedimentation tank, 1 waste liquid pond, 1 collecting tank, 4 hold slag bath, 3 buffer tanks, 6 charge pumps, 5 way changers and 15 valves, its characterized in that: the sedimentation tank contains chemical industry slurry, the settled chemical industry slurry enters a belt filter press under the action of a first feeding pump through the bottom of the sedimentation tank, the belt filter press puts the filter-pressed chemical industry material into a first slag containing tank, the generated chemical industry filtrate enters a recovery main pipeline through a sixth feeding pump and a fourteenth valve and returns to the sedimentation tank, the upper part of the sedimentation tank is provided with a chemical industry filtrate outlet, the chemical industry filtrate enters a first route changer through a first valve and a second feeding pump, the first route changer is adjusted, the chemical industry filtrate enters a second route changer or a third route changer, the second route changer is adjusted, the chemical industry filtrate enters a waste liquid tank or enters a second valve, the chemical industry filtrate enters a box type filter after passing through the second valve and returns to the sedimentation tank, the box type filter puts the filtered chemical industry material into a second slag containing tank, chemical filtrate on the upper part of the box type filter enters a first buffer tank through a third valve, the chemical filtrate enters a third circuit breaker through a fourth valve under the drive of a third feeding pump after being buffered, the third circuit breaker is adjusted, the chemical filtrate enters a fifth valve or a fourth circuit breaker, the chemical filtrate enters an extrusion filter through the fifth valve, the chemical filtrate on the lower part of the extrusion filter enters a recovery main pipeline through a seventh valve and returns to a sedimentation tank, the extrusion filter puts the filtered chemical materials into a third slag containing tank, the chemical filtrate on the upper part enters a fourth commutator through an eighth valve, the fourth commutator is adjusted, the chemical filtrate enters a sterilizing device or the fifth commutator, the chemical filtrate on the bottom of the sterilizing device enters the fifth commutator through a thirteenth valve after being sterilized, the fifth commutator is adjusted, and the chemical filtrate enters the third buffer tank or a pressure filter, chemical filtrate in a third buffer tank enters a pressure filter through a fifth feeding pump and a twelfth valve, the pressure filter puts the filtered chemical materials into a fourth slag containing tank, the chemical filtrate at the bottom of the pressure filter enters a recovery main pipeline through an eleventh valve and returns to a sedimentation tank, the chemical filtrate at the upper part of the pressure filter enters a second buffer tank, the liquid in the second buffer tank is reusable chemical liquid, a part of chemical liquid enters a liquid collecting tank through the bottom of the second buffer tank, and a part of chemical liquid as flushing liquid returns to a box type filter, a pressure filter, an extrusion filter and a belt type filter press through a ninth valve, a tenth valve, a sixth valve and a fifteenth valve respectively through a fourth feeding pump so as to realize flushing of the box type filter, the pressure filter, the extrusion filter and the belt type filter press;
the pressure filter comprises a driving motor, a clutch, a transmission shaft, a distribution head, a ball bearing, a left end cover, an outer barrel main body, a sealing cover plate, a sealing spacer block, a filter screen, an inner barrel main body, a liquid discharge pipe, a filler seal, a right end cover, a roller bearing, an outer barrel support, a support base plate, a side branch, a scraper discharging device and a discharging box, wherein the driving motor is connected with the transmission shaft through the clutch;
the pressure filter also comprises a speed reducer and a lubricating device, wherein the speed reducer is arranged between the driving motor and the clutch, the rated power of the speed reducer is 5Kw, the output torque is 50500Nm, and the lubricating device is a manual oil pump.
2. The pressurized filtration system for chemical industry slurry of claim 1, wherein: the inner barrel main body, the filter screen, the distribution head, the liquid discharge pipe, the scraper discharging device and the discharging box of the pressure filter, which are in contact with chemical materials, are made of corrosion-resistant stainless steel materials, and the transmission shaft, the ball bearing, the left end cover, the outer barrel main body, the sealing cover plate, the sealing spacer block, the packing seal, the right end cover, the roller bearing, the outer barrel support, the supporting bottom plate and the side branch, which are not in contact with the chemical materials, are made of carbon steel materials.
3. The pressurized filtration system for chemical industry slurry of claim 1, wherein: the belt filter press comprises a frame, a gravity separation area, a squeezing separation area and a liquid guiding device, wherein the gravity separation area, the squeezing separation area and the liquid guiding device are arranged on the frame, the gravity separation area comprises a feed inlet, a first driving motor, a first deviation adjusting device, a support roller and a filter belt, the squeezing separation area comprises a second driving motor, a third driving motor, a pre-pressing device, an upper filter press belt, a lower filter press belt, a tension roller, a discharge roller, a dewatering roller system, a support roller, a second deviation adjusting device and a third deviation adjusting device, chemical pulp to be subjected to liquid removal enters the gravity separation area through the feed inlet, most of chemical pulp is removed from the filter belt under the action of gravity, the first driving motor drives the support roller to rotate to drive the filter belt to rotate circularly, the first deviation adjusting device adjusts the running route of the filter belt through the deviation adjusting roller to enable the filter belt to be in a certain tensioning state and prevent the filter belt from falling off the roller, chemical pulp enters a squeezing separation area after passing through a gravity separation area, an upper filter press belt and a lower filter press belt are supported by a tension roller, a dewatering roller, a carrier roller and an unloading roller to form a squeezing separation area, a second driving motor and a third driving motor drive the unloading roller to realize continuous circular motion of the upper filter press belt and the lower filter press belt, the chemical pulp enters an opening formed by the upper filter press belt and the lower filter press belt, filter cakes are preliminarily formed under the action of two prepressing devices, the filter cakes further remove redundant chemical filtrate through a dewatering roller system to form chemical materials, the chemical materials enter a first slag containing pool after passing through the unloading roller, an upper filter press belt and a lower filter press belt are respectively arranged on a second deviation adjusting device and a third deviation adjusting device, the running route of the filter belts is adjusted through deviation adjusting rollers, so that the upper filter press belt and the lower filter press belt are in a certain tensioning state and are prevented from falling off the rollers, and the filtrate removed from the gravity separation area and the squeezing separation area enters a liquid guide device, and returning the chemical filtrate in the liquid guiding device to the sedimentation tank.
4. The pressurized filtration system for chemical industry slurry of claim 1, wherein: the box type filter is formed by stacking a plurality of filter boxes, a spray pipe is arranged in each filter box, a movable plate, a plurality of filter plates, a fixed plate, a rack and a transmission device are arranged in each filter box, the spray pipe is arranged on the upper portion of each filter box, a plurality of nozzles are arranged on the spray pipe, flushing liquid is sprayed to the filter plates, the filter plates are provided with a plurality of movable plates, the filter plates and the fixed plates are arranged in the filter boxes from top to bottom, the movable plates and the filter plates are arranged on guide rails of the rack, the fixed plates are fixedly arranged at the bottom of the rack, the filter screens are arranged on the filter plates, the movable plates and the filter plates are connected through the transmission devices to further realize linkage of the filter plates, the movable plates are driven by the transmission devices to move towards the fixed plates and extrude the filter plates, in the operation process, the intervals between the filter plates are equal, the filter boxes are sealed by metal contact, and contact surfaces between the filter boxes are deformed by certain external pressure, so that the contact surfaces are tightly attached to prevent fluid from passing through.
5. The pressurized filtration system for chemical industry slurry of claim 1, wherein: the extrusion filter comprises a water spraying pipe, a cylindrical shell, screw rotary vanes, a driving motor and a convergence plate, wherein a liquid drainage hole is formed in the middle of the cylindrical shell, the water spraying pipe is arranged at the top in the middle of the cylindrical shell, the water spraying pipe is provided with a plurality of spray heads and is used for spraying flushing liquid to the cylindrical shell, the liquid drainage hole in the cylindrical shell is flushed, the liquid drainage hole is prevented from being blocked, a discharge port and a feed port are formed in two ends of the cylindrical shell, the driving motor is arranged at one end of the discharge port, the discharge port is provided with a baffle and a moving ring net, the moving ring net comprises a fixed ring piece and a moving ring piece, the fixed ring piece and the moving ring piece are mutually spaced and have a certain filtering gap, the moving ring piece moves in a certain track in an eccentric mode under the pushing of the screw rotary vanes, extrusion effect is generated on chemical filtrate through the relative movement between the moving ring piece and the fixed ring piece, so that the filtering separation effect of the materials is improved, the number of the convergence plates is two, the bottom in the middle of the cylindrical shell, the two convergence plates have certain gradient, and form a liquid outlet, and the chemical filtrate is collected and discharged.
6. The pressurized filtration system for chemical industry slurry of claim 1, wherein: the system also comprises a main control computer and a sensor, wherein the main control computer receives signals from the sensor and controls the on-off of 15 valves, the selection of 5 loop devices, the running power of 6 feeding pumps, the driving power of a transmission device of the box type filter, the working voltage of 3 driving motors of the belt type filter press, the working voltage of a driving motor of the extrusion filter and the working voltage of a driving motor of the compression filter through a bus.
7. The pressurized filtration system for chemical industry slurry of claim 6, wherein: the main control computer is provided with a fuzzy control device and a processor, the fuzzy control device comprises a differentiator, a fuzzification interface, an output quantity conversion module, a reasoning machine and a knowledge base, a rotating speed sensor provides the measured rotating speed of a driving motor of the belt filter press, the extrusion filter and the compression filter to the differentiator, the differentiator subtracts the set rotating speed input by an operator from the measured rotating speed to obtain an error value E, the error value E obtains an error change rate dE/dt through the differentiator, the error value E and the error change rate dE/dt are provided to the fuzzification interface, fuzzification assignment is carried out on the error value E and the error change rate dE/dt to respectively obtain a fuzzification error value ME and a fuzzification error change value MEC, the fuzzification error value ME and the fuzzification error change value MEC are provided to the reasoning machine, the reasoning machine carries out fuzzy reasoning on the fuzzification error value ME and the fuzzification error change value MEC to obtain a fuzzy control quantity MU according to the input and output membership vector value in the knowledge base and a logic reasoning rule to provide working voltage for the driving motor according to the actual control quantity U.
8. The pressurized filtering system for chemical industry slurry according to claim 7, wherein: the fuzzification assignment process specifically comprises the following steps: selecting parameters PL, PB, PM, PS, ZO, NS, NM, NB and BL according to linguistic variables of an operator, wherein the parameters respectively represent positive oversize, positive center, positive small, zero, negative small, negative center, negative large and negative oversize, and a corresponding fuzzy set { -n, -n +1,. 9.. 9., 0,. 9.. Once.., n-1,n }, and n =4;
determination of the quantization factor, k e = n/e, wherein k e Is the error value quantization factor, e is the measured maximum error value, k ec =n/ec,k ec Is the error rate quantization factor, ec is the measured maximum error rate,
if m is less than or equal to k e E≤m+1,m&N, the fuzzification error value ME is rounded k e E;
If k is e E&N, the fuzzification error value ME is-n;
if k is e E&N, the fuzzification error value ME is n;
if m is less than or equal to k ec E≤m+1,m&N, the variation value MEC of the blurring error is k after rounding ec E;
If k is ec E&N, the variation value MEC of the fuzzification error is-n;
if k is ec E&N, the variation value MEC of the fuzzification error is n;
wherein the knowledge base comprises a database and a rule base,
the fuzzy membership vector values of the input variables and the output variables are stored in the database, the vector values are a set of corresponding values of the input variables and the output variables after discretization through corresponding domains and the like, if the corresponding domains are continuous, the corresponding domains can be used as membership functions, for the input fuzzy variables, the membership functions are stored in the database, and data are provided for an inference engine in a fuzzy inference relationship.
9. The pressurized filtration system for chemical industry slurry of claim 6, wherein: n vibration sensors and N noise sensors are uniformly and alternately arranged on the circumferential direction of an outer barrel main body of the pressure filter, the vibration sensors mechanically collect vibration signals, the noise sensors collect noise signals, and the material level in the outer barrel main body of the pressure filter is judged through the mechanical vibration signals and the noise signals.
10. The pressurized filtration system for chemical industry slurry of claim 9, wherein: the specific steps of judging the material level in the outer cylinder body of the pressure filter through the mechanical vibration signal and the noise signal are as follows:
step 1, filtering N collected mechanical vibration signals and N collected noise signals, removing useless signals, and obtaining N mechanical vibration signal curves and N collected noise signal curves;
step 2, fitting the N mechanical vibration signal curves and the N noise signal curves to obtain the ith mechanical vibration frequency function f iz And ith noise frequency function f ic
Step 3, calculating an average mechanical vibration frequency function f z And average noise frequency function f c ,i=1,2,......,N;
And step 4, calculating the sound level,
wherein L is sound level intensity, t is time, e is the base number of a natural logarithmic function, lg is a logarithmic function, F () is an impact force function between materials, and H e () For the structural response function, a is the sound level weighting coefficient, σ rad Coefficient of acoustic radiation, η s Is an internal damping coefficient, d is the average thickness of the outer cylinder body of the pressure filter, and Re represents the real part of a plurality of values;
step 5, drawing a curve of the sound level intensity L, extracting an envelope signal, forming an envelope curve, performing down-sampling processing on the envelope signal, and performing data compression;
step 6, performing low-frequency reconstruction on the compressed data to obtain a low-frequency reconstruction signal;
and 7, comparing the low-frequency reconstruction signals with pre-measured low-frequency reconstruction signals respectively at 10%, 20%, 30%, 40%, 50%, 60%, 70%, 80% and 90% material levels through the trained three-layer BP neural network, and outputting real-time material level information of the outer cylinder body of the pressure filter.
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