CN106999820A - Filter retentate removes system and method - Google Patents
Filter retentate removes system and method Download PDFInfo
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- CN106999820A CN106999820A CN201580061145.5A CN201580061145A CN106999820A CN 106999820 A CN106999820 A CN 106999820A CN 201580061145 A CN201580061145 A CN 201580061145A CN 106999820 A CN106999820 A CN 106999820A
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- Prior art keywords
- filter
- fluid
- retentate
- regional
- nozzle
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
- B01D46/70—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter
- B01D46/71—Regeneration of the filtering material or filter elements inside the filter by acting counter-currently on the filtering surface, e.g. by flushing on the non-cake side of the filter with pressurised gas, e.g. pulsed air
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D41/00—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids
- B01D41/04—Regeneration of the filtering material or filter elements outside the filter for liquid or gaseous fluids of rigid self-supporting filtering material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/021—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters
- F01N3/023—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles
- F01N3/0233—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust by means of filters using means for regenerating the filters, e.g. by burning trapped particles periodically cleaning filter by blowing a gas through the filter in a direction opposite to exhaust flow, e.g. exposing filter to engine air intake
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- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Filtering Of Dispersed Particles In Gases (AREA)
Abstract
The present invention discloses a kind of system and method for being used to remove retentate from filter, and the system and method utilize supercharging and/or vacuum fluid by local application.The present invention describes a kind of cleaning systems and a series of for the step of carrying out following operation：Implement the cleaning process, guide fluid to flow through the regional area of the filter medium whereby, thus removed from the filter and remove gathered retentate.In addition, local apply of fluid stream allows with the cleannes of the spatial resolution part monitoring filter of higher degree.This filter retentate removes system and method and can be widely used in from engine and gas extraction system to production plant and the broad range of system and process of equipment.
Description
Technical field
Particulate filter is used in broad range of situation and system to capture material or retentate, and controls institute defeated
The composition or characteristic of the fluid gone out.The particulate matter collected in filter, which can effectively be removed, to be allowed to extend making for filter
With the life-span and it can reinstall and reuse filter.It is used to institute is removed and collected from filter the present invention relates to one kind
The material of trapping or the system and method for retentate.
Background technology
Illustrate that the example of the broad applicability of particulate filter cleaning systems includes the filtering of commercial and passenger car diesel particulate
Device system, gasoline engine particulate filter, and industrial process and application, wherein from any effluent stream (solid, liquid or gas
Body) particulate matter or retentate must be controlled or be minimized.
One particular instance is related to the particulate filter such as diesel engine or gasoline engine particulate filter, and wherein retentate is gathered in
In filter and periodically it must be moved out of and remove.However, any filter or retentate trapping medium or system all will be use
The method carries out the candidate of automation cleaning.
Particulate filter is used to provide the vehicle of power from bavin Water Oil Or Gas or the waste gas of equipment and dynamical system is reduced
Or eliminate some undesirable particulate matters.In this example, cigarette ash and ash content can be accumulated in filter.Cigarette ash based on carbon
Periodically aoxidized by means of regenerative process, thus raise the temperature of filter to promote cigarette ash and oxygen, nitrogen dioxide or a certain
The reaction of other oxidants.The cigarette ash of this carbon after allowing based on oxidation leaves filter as carbonoxide byproduct.However, grey
Divide and be made up of incombustible material, the incombustible material is mainly metal oxide, sulfate, phosphate and other materials
Material, these materials can not be aoxidized from filter.Filter must regularly remove from engine, equipment or machine and obtain clear
It is clean.
Currently, clean method includes pressurized air, thermal cleaning, liquid-based washing, vibration and the combination of other correlation techniques.
It is most common specific to the general ceramic particles filters (there are multiple passages in alternate ends closing) designed with honeycomb type
Clean method includes the combination of thermal cleaning and adverse current pressurized air.These systems are typically made up of nozzle, and the nozzle is given
Crossed above the exit surface for being highly in filter.Nozzle blows pressurized air, the pressurizing air at the back side of filter
Gas removes the ash content of deposition, so that the ash content moves to the front of filter and dropped.Another the replacing of pressurized air cleaning
Change including Pulsating Flow platform, thus force pressurized air to pass through whole filter from exit face in unstable fashion.
Although relatively success, these methods have many shortcomings, the present invention overcomes the shortcoming.Crossing formula nozzle
In the case of, do not produce sealing between nozzle and filter.Therefore, air is not forced directly through filter, but can
Using the path of minimum drag.This path generally surrounds filter, or away from filter, rather than through plugged sereen element
Or passage.In the case of Flow Technique of pulsing, end cap is assembled to the outlet of filter and to force pulsed air to immediately pass through whole
Individual filter.The effect of the method is limited by the fact that：Air will use the path of minimum drag again (away from blocking
Area).This, which occasionally results in the whole of filter, partly becomes not influenceed by cleaning process.
Can with clean method another limitation is that lack to quantify during cleaning process in the filter ooze remaining
The field data of thing level (or chocking-up degree) and the cleannes of filter after the cleaning.Local stoppages and defect generally exist
It is invisible during cleaning.Expect to determine the amount or characteristic of the retentate in filter in addition to optimize cleaning procedure parameter with most
Efficiently clean filter.The live knowledge of the degree of retentate level or plugged filter also allows after filter is cleaned
It is non-to terminate cleaning process on the time of scheduled volume, as the situation of Most current cleaning systems.
It is current pneumatic or air stream clean technologies another limitation is that the large energy and infrastructure of the technology will
Ask.For example, a considerable amount of air in nozzle can be discharged into surrounding environment by non-contact air nozzle or air knife method.
In some examples, these systems can be in the flow velocity in 20scfm to 120scfm or bigger scope and 100 to 150psi or more
Big nozzle exit pressure operation.These systems need larger and expensive air compressor, and air-treatment and regulating system.Cause
Being these, cleaning process based on nozzle does not contact or sealed filter, so most of deviation filter table in pressure-air
Face, around filter flow, in the region away from nozzle with low-speed flow through filter, or along by filter it is clear
The path of the minimum drag in the region of clean or minimum blocking.Not only these systems produce big in poor outcome, and air
Part is also wasted in this process.The present invention produces sealing around the surface of filter, so as to guide high pressure air flow local
Ground is produced and had compared with low system cost, infrastructure requirements and the energy compared with little waste by the bottleneck area of filter
More excellent result.
The pulse of the air through high pressure compressed is guided to be reduced by the Pulsating Flow method of whole filter volumetric by escaping
Air loss caused by filter, it also requires larger and expensive air compressor and infrastructure.Safety can be also presented in high pressure
Property endangers and produces loud undesirable " blast " sound.The unexpected outburst of high-voltage pulse also introduces retentate and leaks and escape into
Other risk in working environment, health and safety harm is presented in this.Although in addition, the maximum pressure and flow velocity of these systems
Can to be higher, but local flow relatively low (assuming that a larger filter region is subjected to the stream) by individual other passage and also along
The path of minimum drag.Similar to air nozzle method, pulsating cleaner also meet with retentate from the incomplete of filter and
The problem of poorly efficient removal.
Also using the clean method substituted, such as with chemical solution, water or even ultrasonic clean (using liquid come will be super
Sound wave is coupled to filter) wet cleaning processes.These clean methods include the limitation of the following：It is situated between with some filterings
Chemical incompatibility between matter, or with certain filter part (for example, in the case of certain form of particulate filter
Fiber mat etc.) incompatibility.The other limitation of wet cleaning system include to after the cleaning from filter dry or
Remove the other step of cleaning liquid or solution, and fluid recovery in itself or throw aside.
Examples listed above emphasize to remove and remove on filter medium or middle collection particulate matter or retentate
Development the need for, the development to broad range of application and using field will have sizable effectiveness.
Filter retentate cleaning systems and method described in the present invention cause the direct and high localized of filter
Pressure air cleaner efficiently remove collection retentate medium.The system and method also allow before cleaning process, the phase
Between or in local horizontal and be used as the cleannes of overall quantization filter or retentate medium afterwards.
The content of the invention
The present invention relates to a kind of system for being used to remove retentate from filter, the system includes being used to apply fluid
One or more regional areas to filter for removing and removing from one or more regional areas of filter ooze remaining
The component of thing.
In one embodiment, the component of one or more regional areas for applying a fluid to filter includes
Fluid tip, the fluid tip seals one or more regional areas of filter.
In one embodiment, the system is comprised additionally in for fluid tip to be positioned at into one or many of filter
Actuating mechanism at individual regional area.
In one embodiment, actuating mechanism mobile fluid tip in two dimensions, and including central shaft can be surrounded
Line rotation main shaft, be attached to the linear shell of main shaft, at least one linear pole on linear shell and bracket,
The nozzle is installed to bracket, and the linear pole allows bracket together with the linear actuators and is installed to the spray of bracket
Mouth moves back and forth.
In one embodiment, the system comprises additionally in the vertical cause for the mobile fluid tip in third dimension
Dynamic device.
In one embodiment, the component for applying fluid for one or more regional areas to filter includes tool
There are the manifold of one or more valves, the valve and the one or more conduits included in the conduit shell of sealing filter
Coordinate, one or more of valves it is adapted to open and close to allow fluid to flow through one or many corresponding to filter
One or more of conduit of individual regional area.
In one embodiment, the component for applying fluid for one or more regional areas to filter was located at
The entrance of filter or exit, and be additionally included in the entrance of filter or outlet another at be used for filter
The component of one or more regional area applying vacuums or pressure, the component includes another discrimination with one or more valves
Pipe, the valve one or more is led with what is included in another the conduit shell in sealing the entrance of filter or outlet
Pipe coordinates, and one or more of described valve is adapted to open and close with by corresponding to the one or more of filter
One or more of conduit of regional area comes applying vacuum or pressure.
In one embodiment, in one or more of regional area of one or more sensor measurement filters
Retentate amount.
The invention further relates to a kind of method for being used to remove retentate from filter, methods described includes being used to apply fluid
One or more regional areas of filter are added to ooze for removing and removing from one or more regional areas of filter
The step of excess.
In one embodiment, methods described comprises additionally in following steps：Stop after the time by scheduled volume
Pass through the flowing of the fluid of one in the regional area of filter；Nozzle is moved to other regional areas of filter；And
Repeated the above steps for each in other regional areas of filter.
In one embodiment, methods described comprises additionally in following steps：After the time Jing Guo predetermined minimum amount
Measure the parameter in one in the regional area of filter；If after the time Jing Guo predetermined minimum amount at the parameter
In predetermined value, then stop the flowing of the fluid of one in the regional area by filter；Nozzle is moved to filter
Other regional areas；And repeated the above steps for each in other regional areas of filter.
In one embodiment, methods described comprises additionally in following steps：If in the time Jing Guo predetermined minimum amount
After-filter regional area in one in parameter be not at predetermined value, then continue logical on the maximum amount of time is made a reservation for
The flowing for the fluid of one crossed in the regional area of filter；If in the after-filter by making a reservation for the maximum amount of time
The parameter in one in regional area is in predetermined value, then the fluid of one in the regional area that stopping passes through filter
Flowing；And repeated the above steps for each in other regional areas of filter.
In one embodiment, methods described comprises additionally in following steps：If by making a reservation for the maximum amount of time
After-filter regional area in one in parameter be not at predetermined value, then repeat the above steps.
In one embodiment, the parameter is the fluid by one or more of the regional area of filter
Flow velocity, and comprise additionally in following steps：If the flow velocity of fluid is on predetermined threshold after the time by scheduled volume,
Stop the flowing of the fluid by one or more of the regional area of filter.
In one embodiment, the step of methods described comprises additionally in the hot recycling for implementing filter.
In one embodiment, methods described comprises additionally in following steps：Applying a fluid to one of filter
Or before or after the step of multiple regional areas, check and analyze one or more regional areas of filter.
In one embodiment, the step of checking and analyze one or more regional areas of filter includes following step
Suddenly：Measure one or more offices of filter weight, retentate volume, filter passages length, retentate fraction or filter
One or more of position of retentate in portion region.
The other benefit and advantage of the present invention will be by carrying out with reference to accompanying drawing to embodiment and appended claims
Subsequent description and become apparent to the technical staff in field involved in the present invention.
Brief description of the drawings
Fig. 1 represents to remove system using the filter retentate of the nozzle of actuated supercharging；
Fig. 2 represents to seal the charging fluid feeding mechanism of a part for filter medium；
Fig. 3 is represented using the automation with the manifold equipped with valve of the fluid conduit systems Shu Peihe on the two ends of filter medium
Filter retentate removes system；
Fig. 4 represents nozzle and time and the reality of the possible clean method of flow measurement feedback a kind of of the explanation using positioning
Example flow chart；And
Fig. 5 represents that the example flow chart of cleaning process is described in detail.
Embodiment
Fig. 1 describes removes system using the automation filter retentate of the combination of the charging fluid applied by nozzle 114
One embodiment of system, a part for the sealed nozzle filter medium 102.Automation in this embodiment passes through it
The actuating system 120 that middle nozzle is physically moved is realized, but the automation can also be for example, by manifold or stream equipped with valve
Other methods such as body canal clump are even realized by manual methods in another example.
Actuating mechanism 120 is described for the purpose of physically moving nozzle 114 in Fig. 1.In one embodiment,
Main shaft 116 surrounds central axis rotation by means of the actuator 126 such as stepper motor, but any actuator can all be made
With.It is linear shell 106 to be attached on main shaft 116, and one or more linear poles 108 are arranged on the linear shell.
These bars 108 allow bracket 110 to move back and forth together with linear actuators 122.Because linear shell 106 rotates and bracket 110 is horizontal
Wear, so the physical part of bracket 110 is movable to any position in two dimensional surface space.
Actuating mechanism 120 in this embodiment allows nozzle 114 being positioned in two-dimentional polar coordinate space.However,
Described device can be used any coordinate system, or for moving nozzle purpose actuator and any coordinate system combination.This can
Comprising such as two-dimensional linear actuation phase, wherein nozzle is moved in the x and y direction, as described by by Cartesian coordinate.Herein
In embodiment, stepper motor 122 and 126 is used to nozzle being moved to exact position.Can be using the actuating method substituted, bag
Angle locator, rack and pinion system containing the direct current generator fed back with position, with encoder, pneumatically or hydraulically cylinder,
Linear electric machine or any other linear and/or rotary-actuated component.In general, the cleaning in regional area is being performed
At any time, any method on the surface of the filter cleaned for scanning can all be used.In another embodiment,
Nozzle 114 can be fixed, and filter medium 102 is through movement or rotates to realize identical result.
In this embodiment, vertical actuator 112 is installed to bracket 110 so as to moving nozzle 114 in third dimension.
Actuator 112 also comprising charging fluid feeding mechanism 124 and provided by power, but also can by solenoid, screw or its
Its component provides power, and charging fluid feeding mechanism may be housed in Anywhere.
In another embodiment, two-dimentional actuating mechanism 120 and vertical actuator 112 are combined into three degree of freedom
Triangular web.In another example, multiple actuating systems can be used.Any positioning or actuating system or sub-assembly can be used for repairing
Change position of the nozzle 114 relative to filter medium 102 or direction, on condition that nozzle 114 is in the time in work in system
Filter medium 102 is sealed on all or part of.
Filter medium 102 can be arranged on the lower section of actuating mechanism 120 so that nozzle 114 is on the surface of the filter medium
Moved in the plane of side.Surface of the actuator 112 nozzle 114 to be reduced to filter medium 102 so that nozzle 114 with
Sealing is produced between filter 102, charging fluid is thus forced with regional area of the high velocity stream through filter 102.Supply pressure
The particular geometric configuration of embodiment, the attribute of filter medium and desired flow velocity and condition can be depended largely on.Example
Such as, fluid supply can be in the range of from 25psig to 200psig.Fluid supply can be stable, temporary transient or pulsation.
In another embodiment, nozzle 114 can be arranged on the lower section of filter medium 102, or can be used two nozzles 114,
One of nozzle is in the top of filter 114, and a nozzle is below the filter.In another embodiment, it can be used
Multiple nozzles 114 simultaneously activate these nozzles in series, in parallel or with its deriving mode.One in stream will be in using
Main flow during filter is in the reverse direction.
The support 104 of filter medium 102 is designed so that removed retentate can be by the opposite side of filter 102
Spray.This retentate can be dropped or be collected and analyze.
Retentate removes to include removes particulate matter using vibrating from filter 102 or trapping medium
Matter.When using vibration, either directly or indirectly filter medium 102 can be applied and vibrated.That is, vibrating elements 118 can
Filter medium 102 is directly attached to as shown in the figure, or can be by clean frame 104 by the way that nozzle 114 is via housing or passes through certain
One other components are indirectly applied to actuator mechanism 106.Vibration can be before, during or after charging fluid cleaning or at it
Apply in the case of any combinations.In this embodiment, vibration apply during cleaning, and acceleration can from 10g to
In the range of 200g, wherein g is due to acceleration caused by gravity.However, any level of vibration and frequency can be used, at one
Supersonic frequency is included in embodiment.
In another embodiment, filter medium 102 can be moved relative to nozzle 114 or filter medium position relative to
The nozzle is adjusted so that can apply partial fluid.This embodiment can include stationary nozzle and mobile located mistake
Filter medium, or a certain combination that nozzle and filters locations are controlled.
Include the global flowing of the fluid by filter, or nozzle using the current filter clean technologies of charging fluid
Filter is moved through in the two-dimensional space at the assigned altitute above filter to be cleaned.Fluid can be therefore using process
The path of the minimum drag of large area, this is the major defect of these technologies.Fig. 2 illustrates the solution of this problem, whereby
Nozzle 204 is reduced by means of actuating and the sealing on the surface of filter 202.Therefore charging fluid is forced from nozzle
204 flow through filter medium 202, therefore prevent preferred stream from passing through the path cleaned, or surround or remote filter 202 itself
Flowing.
In illustrated embodiment, nozzle 204 is reduced on the direction perpendicular to filter surfaces 206.Packing ring or
Annular seal 208 can be used for improving the sealing between nozzle 204 and filter 202.Charging fluid is then channeled with vertical
Nozzle 204 is flowed up through in the side of filter surfaces 206 and by filter medium 202.It can be changed simultaneously by the flow velocity of nozzle 202
Depend largely on supply pressure and cleaning medium (gas, liquid or solid).For example, in this embodiment, flow velocity can use
Certainly in supply pressure, the size of nozzle 204 and filter medium attribute (include cleannes) and in the model from 10scfm to 150scfm
In enclosing.
In another embodiment, filter 202 itself can through it is mobile or position so as to seal filter in itself with nozzle.
This embodiment can allow positioning nozzle, filter medium or its a certain combination.
Fig. 3 illustrates to use the actuating realized via the manifold 308 equipped with valve coordinated with fluid conduit systems clump to obtain
The alternate embodiment of sterically defined device on the surface of filter, and can avoid completely or partially to relative to mistake
The need for the other actuating system of the position of the surface movement cleaning nozzle of filter.
In one embodiment, filter medium 302 can be fixed.In filter outlet or top side as shown here
On be attached with conduit shell 304.Shell 304 seals filter 302.In one particular embodiment, shell 304 can be by one
Row through hole is constituted, and the through hole allows fluid to pass through and enter in filter 302, and the through hole can be fixation or adjustable
Whole.Shell 304 is also comprising one clump of fluid conduit systems 306.Charging fluid is delivered to shell by conduit 306 from valve actuating manifold 308
304.Valve actuating manifold 308 is supplied by charging fluid feeding mechanism 310.In another embodiment, filter medium 302 can
Moved relative to conduit shell 304 or the position of filter medium is adjusted relative to the conduit shell.
In one embodiment, fluid flow to manifold 308 from feeding mechanism 310.A certain valve or series of valves 314 dozens
Open and close close to allow fluid to flow through the specific of ad-hoc location on the surface corresponding to filter 302 via conduit shell 304
Conduit 306.By via using packing ring or other components come by body seal to filter, it is ensured that fluid is in the ad-hoc location
Place travels through filter.Therefore, the Partial controll of fluid flow is activated by valve rather than ensured by position control.
Alternatively, this configuration can be used by the way that system is applied into the entrance of filter, and the entrance is such as by Fig. 3
Filter 302 lower surface illustrated by.In this example, shell 304 will be sealed to by means of packing ring or other components
The entrance of filter.Cage connection will be equipped with the manifold of valve by conduit 306 to second with a certain valve or series of valves 316
308.However, in this example, manifold will be supplied with vacuum source 312 in one embodiment, or in another embodiment
It is middle to be supplied with pressure source.In one embodiment, pressure source can be used for the retentate for detecting the back side by filter
Leakage, or turbulization is to strengthen removal of the retentate from filter.May or may not for leak detection by flow forward
Using a series of conduits, but it may be realized via single nozzle.
In another embodiment, vacuum can be by using the manifold equipped with valve with vessel cluster 306 and the cooperation of shell 304
308 ad-hoc location to be applied on the inlet face of filter medium 302.Fluid may be directed to flow to vacuum from manifold 308
Feeding mechanism 312.A certain valve or series of valves opening and closing correspond to filtering to allow fluid to be flowed through via conduit shell 304
The particular catheter 306 of ad-hoc location on the surface of device 302.By the way that body seal is arrived via using packing ring or other components
Filter, it is ensured that fluid travels through filter in the specific location.In this embodiment, one in both sides can wrap
Containing unitary catheter rather than one clump of conduit.That is, the charging fluid from feeding mechanism 310 can be by with a certain valve or one
The manifold 308 equipped with valve of series of valves 314 is partly guided by the conduit clump 306 on the back side of filter 302, and vacuum quilt
Attract by the unitary catheter 306 on front.Alternatively, charging fluid can be directed to filter via unitary catheter 306
302, and vacuum is partly applied to via conduit clump 306 and the manifold 308 equipped with valve with a certain valve or series of valves 316
Front.
Using valve actuating method as illustrated in Figure 3, any combinations or configuration can be used.Charging fluid can be applied to
The back side of filter medium, the fluid under negative pressure meter pressure can be applied to the front of filter medium, or using pressure and vacuum
Any combinations.
In another embodiment, filter medium in itself can through mobile and position, so as to charging fluid or vacuum or its
It is a certain to combine partly to direct flow through specific region.This embodiment can also include the group of actuating and the manifold equipped with valve
Close, to be produced identical with pressure, vacuum or its a certain combination and locally be applied effect.
The important advantage of the present invention be can partly measure stream attribute, it is the general health of filter medium, clear
Cleanliness and other attributes.Current filter clean technologies can only provide the overall flow rate resistance for being related to filter information (if
In the presence of).However, the present invention allows to measure flow and cleannes characteristic in certain filter position.These measurements may include
Addition and the pressure and/or flow sensor of charging fluid feeding mechanism point-blank, or measurement pass through system
Other components of flow.At each position, flow measurement can be carried out to recognize blocking position with high or polar region pressure difference
(low discharge) and cleaning position (high flow capacity), or even damaged area.In addition, the time span at each position can change so as to
Optimize retentate removal process.Flow and pressure measxurement can allow the predetermined or existing of nozzle at each position and fluid flow
The field residence time.In the later case, flow measurement can be used for depend on flow increase above acceptable thresholds time and incite somebody to action
The time that cleaning in given position is completed is sent with signal.Pressure, flow and residence time information can be used for constructing
The flow pattern of filter, the flow pattern will be helpful to the region of the other cleaning of positioning needs and inspection.This figure provide to
The space in the region of high or low flow restriction is indicated, correspondingly indicates blocking region or fault zone.
With reference to Fig. 1, one or more pressure sensors and one or more flow sensors can be with nozzle 114 and conduits
124 point-blank (or in be in fluid communication) and install, to measure the pressure and flow in conduit 124.Pressure and stream
Quantity sensor can be same or single.Any kind of pressure sensor and any suitable flow sensor can be used,
Or Flow Measuring System or method.
Another embodiment can include adjustable nozzle.When the cleaning for recognizing the need for other cleaning or more localizing
Region when, jet size can be adjusted by adjusting upstream pressure or nozzle geometry structure, to change stream attribute, comprising but
It is not limited to flow velocity, speed and audio conditions.Jet size can be adjusted to application-specific size or it is adjusted with solve block.
These adjustment can be included to outlet diameter, throat diameter (if depositing), nozzle cross-sectional shape or the change of its combination.To nozzle
The adjustment of shapes and sizes can be related to flow measurement, or can perform as a part for cleaning process.
Other advanced detection technologies can also be used for retentate level or the blocking for determining current or instantaneous at the scene.One
Such example can be RF sensing, to determine that the instantaneous particle material in ceramic filter is loaded, but in any filter base
Any retentate detection technology, inclusion relation (based on light) x-ray and other technologies can be used on plate.
Fig. 4 represents explanation using the controllable nozzle in position together with time and a kind of possible filter of flow measurement feedback
The flow chart of retentate minimizing technology.In any given position, nozzle residence time can be traced together with instantaneous velocity.As long as
Reach minimum residence time or nozzle residence time and given position instantaneous delivery on threshold value, will just allow nozzle
It is moved to latter position.In addition to flow velocity, it is also possible to use pressure (its Plays is by the pressure measured by needs under threshold value) or
Any other suitable parameter can be used.The figure of cleaned filter can be produced to indicate the possibility area for cleaning or checking
In the case of domain, the fracture wall of reduction filter clogging effect especially in the filter.In another example, the figure may indicate that
Blocking in high flow capacity restricted area or filter.
In an illustrative methods and embodiment, filter installs 402 into cleaning equipment first.Start to clean
Journey 404, rear nozzle be moved to the original position 406 of nozzle.At this point, main cleaning cycle can start.
Nozzle is reduced to 408 on filter substrate first, and the generation sealing between nozzle and filter.Once produce
Sealing, begins to the flowing 410 entered by nozzle in filter.Start in flowing after 410, the process starts measurement
Pass through nozzle and the flow velocity 414 that enters in filter.Meanwhile, the process needs the increase waiting period 412 specified.This can
By predetermined and allow fluid to discharge and spray some retentates trapped.After the stand-by period 412 specifying through,
The process needs logical condition 416 to determine whether to have reached minimum cleaning time.If not yet reaching the time,
The process returns to wait condition 412.If having reached minimum time, the process can continue to the second logical condition
418, to determine whether flow or pressure by filter have reached acceptable thresholds.At this point, if flow is not
It is enough to show clean part, then the process can continue to the 3rd logical condition to determine staying in the specific location
Whether the time has reached specific higher limit 420.If really not so, it is to be increased that the process can return to etc., wherein repeating
The sequence.If flow on threshold value 418 or pass through maximum time 420, the process can continue with stop flowing
422.At this point, nozzle can raise 424, and the process may proceed to its last logical condition 426 to determine whether
Complete whole cleaning process.If it is not, then nozzle is movable to the next position 428, process described whereby can be in next subsequent position
Place is put to repeat.Otherwise, the process can complete and can terminate 430.
This embodiment describes the minimum residence time 416 and maximum 420 liang of residence time of each position on filter
Person.This embodiment is also using the amount such as measured by flow velocity 414, to determine filter in the specific location
Flow resistance, but any amount is alternatively, include pressure.However, in other embodiments, different measured amounts can be used
To determine the residence time at each position.Such amount can be penetrated comprising the global or specific parameter in space, such as back pressure, x
Line analysis, split using the radio-frequency queries of resonance or anharmonic method of slight, weight measurement, light or Laser Transmission or absorptiometry, ultrasound
Stitch detection, acoustic measurement, Terahertz measurement, or any other suitable measuring system.Alternatively, the process may include every
The residence time of fixation at one position, without being fed back using measured amount.
Fig. 5 shows the flow chart of an exemplary of filter cleaning process.Reference can be used in the step
System and method that Fig. 1 to Fig. 4 is described or any other suitable cleaning systems are performed.In first step 510, received
Filter 102 and record information, described information can include sequence number, Part No., filter size, geometry, material or any
Other identifications or relevant information.Described information can be then input in database in later step 512 or by any suitable
Method record.Record can be manual or automation, such as pass through scanning or image procossing on an example.
In another subsequent step 514, it can implement to check, analyze or one or more tests are to determine on filter
Condition, the degree of retentate accumulation or the information of instruction to filter or equipment malfunction or failure.In an embodiment
In, check and analytical procedure 514 can be comprising one or more of following measurement or analysis：Filter weight, retentate volume,
Position of passage length, retentate fraction or the retentate of opening in filter.For the low of given stream in regional area
Pressure drop (or for high flow rate to constant pressure drop) may further indicate that filter failure.In addition, can also implement the mesh to filter surfaces
Inspection is looked into check the sign of inopportune operation, such as stain, abnormal deposition, cigarette ash or retentate leakage, oil, fuel or cooling
Agent material deposition, rupture, spot corrosion, leakage pleat, the end plug missed, the passage of fracture or abnormal operation or filter defect or failure
Other signs.It can also be completed by borescope, fibrescope, x-ray, light analysis or a certain other methods in filter 102
Portion is checked.
The instrument or the example of measurement/Examined effect that can be applied in inspection and analytical procedure 514 can be including but not limited to：
Pin gauge or scram measurement, x-ray analysis, the radio-frequency queries using resonance or anharmonic method of slight, the material using Raman spectrum point
Analysis, x-ray diffraction, inductively coupled plasma, x-ray fluorescence, energy dispersion x-ray, Fourier transform infrared, weight are surveyed
Amount, light or Laser Transmission or absorptiometry, lamp box measurement, ultrasonic crack detection, acoustic measurement, Terahertz measurement or any other
Suitable measuring system.It is also possible to use to filter's flow limit measurement, for example by flow platform test, measure whereby across
In the flow velocity and pressure drop of filter any one or both.In preferred embodiments, filter is assessed via a series of flow velocitys
Flow restriction, similar to the flow velocity undergone by filter in operation, and measurement across filter specific flow velocity and
Pressure drop.
The sample of filter material or collected retentate can also be removed from the surface of filter 102, or from filter 102
Passage or fold inside remove, for subsequent analysis or characterization in the step 514.In an exemplary embodiment party
In case, retentate sample can remove from filter 102 in one or more positions and be subjected to constituent analysis.In another step
In (not shown in Fig. 5), constituent analysis can be used for the operation shape for determining or inferring the equipment for being provided with filter thereon or machine
State.In an exemplary embodiment, the result of retentate analysis can be used for detecting high oil consumption, bad quality fuels, injection
Device failure, cooling agent leakage, the failure or any other system unit of upstream filter or exhaust gas catalyst.
The result of checking step 514 can be used for determining in step 516 filter be appropriate for clean, readjust or
Remanufacture.In an example, if the result of step 514 detects the sign of filter failure, such as crack, fusing
Area, the filter-portion missed, the end plug missed, sintered deposit or can not the accumulation of removed retentate (such as by chemistry
Bonding), then filter 102 can be rejected in step 532, and be dropped or reclaimed in subsequent step 534.In some feelings
Under condition, depending on the failure of filter 102 or the degree of defect, failure or defect can be repaired in a certain step (not shown), and
Filter 102 returns to step 510 or step 516 by process streams are cleaned.The reparation of filter can comprising reinsert unit or
Replace the end plug missed, addition catalysis material, replace mat or jar and fellow.
If determining that filter 102 is suitable for cleaning or remanufactured in step 516, filter 102 can be through heated
Regeneration step 518.Hot recycling can be used engine (such as parking regeneration or high idle regeneration), burner, in-line arrangement electric heater,
Microwave heating, plasmaassisted regenerate to implement, or using kiln, oven or smelting furnace or for any of hot filtration apparatus 102
Other suitable components are implemented.Other gas componant, oxygen, hydrogen comprising supplement or NOx (NO2), may or may
Apply not in regeneration step 518.Regenerate the time of sustainable scheduled volume, such as it is from 8 hours to 40 hours or any suitable
Time quantum.In another embodiment, regeneration can be implemented until cigarette ash and combustible have substantially been removed from filter, such as
Determined by pressure, total amount, radio frequency, optical, based on light, x-ray or any other suitable measurement.
In one embodiment, temperature increase slope and set point temperatures can be controlled during regenerative process.
In another embodiment, room temperature or heated air can be introduced so that it flows through part or all of filter 102.Another
In embodiment, the temperature that may be implemented in during regenerative process on 600 DEG C is preferentially to cause non-combustible retentate (for example
Ash content in an example) volume reduce.
After regeneration step 518, the determination to the completeness of regeneration can be made in step 520.Step 520 includes true
Determine cigarette ash or whether combustible is fully oxidized.The determination can be made based on visual inspection using the following：Pipeline
Mirror or fibrescope, weight measurement, pin gauge measurement, x-ray or optical measurement or any other suitable measurement or inspection method.Also
The measurement of flow restriction or pressure drop can be used., can if determining that cigarette ash or combustible are not yet fully oxidized in step 520
Indicated in repeat step 516, such as step 536.
If determining that filter 102 fully regenerates in step 520, ash content or retentate cleaning and removal can be in steps
Start in rapid 522.Retentate, which is removed, can include pneumatic or method for oscillating, as described by referring to figs. 1 to Fig. 4.Cleaning can be predetermined
Carry out, or controlled based on the in-site measurement to plugged filter or retentate level on the time of amount, for example by measure across
The pressure or flow of a part for more whole filter 102 or the filter, wherein the part is less than entirety, or by penetrating
Frequency measurement, x-ray measurement, to the survey of the amount (such as being represented in an example by quality or volume) of retentate removed
Amount, or the measurement to the amount of remaining retentate in filter in another example, or any other suitable measurement.Scene is surveyed
Amount can be used for operation and the procedure parameter of control cleaning systems, such as level of vibration (in the case where using vibration cleaning) or empty
Gas velocity or pressure.
After step 522, other inspection, analysis or testing procedure, referred to as 524 can be completed.Check and analytical procedure
524 can include to such as at least one in the measurement with reference to filter state or performance described by step 514.Check and analyze
The result of step 524 can be used for determining whether filter has returned to receptive phase based on step 526.If filter
102 not yet return to receptive phase, then the process (can be not known with step 516 or even in step 510 or 512 in Fig. 5
Show) place's repetition.
If determining that filter 102 has returned to receptive phase in step 526, cleaning process be step 518 to
524 result can be recorded in step 528 in database, record, daily record of work or suitable position and using any suitable
Method record, and filter 102 can return to client in step 530.
And all steps for being listed in Fig. 5 need not be completed, and and this need not be completed with listed order or order
A little steps.For example, step 518 can be omitted in the case where negligible horizontal combustible is gathered in filter 102.Another
In one example, step 522 can be omitted in the case where the noncombustible matter of negligible quantity is included in filter 102.Another
In example, step 510 can be omitted to 514 or step 524.Accordingly, there exist what can be contemplated based on those steps listed in Fig. 5
Many combinations of step, these combinations are not yet expressly recited, but can realize identical general objective.
Although above description includes many particularity, this is not necessarily to be construed as the scope for limiting any embodiment, and
It is the illustration for the currently preferred embodiment that should be interpreted in any embodiment.In the teaching of various embodiments
Interior, many other derivatives and change are all possible.For example, cleaning systems configuration and layout can be from configurations described herein
Easily changed with layout, and alternate embodiment may or may not include all parts, thereby increases and it is possible to or this may not be used
All operating methods and system described in invention.
Those skilled in the art will be further appreciated that the present invention is directed not only to particulate filter cleaning systems and method, and
And further relate to system and method for cleaning any kind of filter, such as air cleaner, liquid filter, filter bag
Room and fellow, wherein the understanding to filter load and the control to filter operation by pollutant or any other material
It is extremely important.
Therefore the scope of the present invention by appended claims and its legal equivalents rather than should pass through given example
To determine.
Claims (17)
1. a kind of system for being used to remove retentate from filter, the system includes being used to apply a fluid to the filter
One or more regional areas it is described for removing and removing from one or more of regional areas of the filter
The component of retentate.
2. system according to claim 1, wherein described be used to being applied to the fluid into described the one of the filter
The component of individual or multiple regional areas includes fluid tip, and the fluid tip seals the one or more of of the filter
Regional area.
3. system according to claim 2, the system is comprised additionally in for the fluid tip to be positioned at into the mistake
Actuating mechanism at one or more of regional areas of filter.
4. system according to claim 3, wherein the actuating mechanism mobile fluid tip in two dimensions, and
Including that can surround the main shaft of central axis rotation, be attached to the linear shell of the main shaft, on the linear shell
At least one linear pole and bracket, the nozzle are installed to the bracket, and at least one described linear pole is together with described
Linear actuators allows the bracket and is installed to moving back and forth for the nozzle of the bracket together.
5. system according to claim 4, is comprised additionally in for moving the vertical of the fluid tip in third dimension
Actuator.
6. system according to claim 1, wherein described be used for one or more of partial zones to the filter
The component that domain applies the fluid includes the manifold with one or more valves, and the valve is with sealing the filter
The one or more tubes fits included in conduit shell, one or more of valves are adapted to be allowed with opening and closing
Fluid flows through one or more of in the conduit corresponding to one or more of regional areas of the filter.
7. system according to claim 6, wherein described be used for one or more of partial zones to the filter
The component that domain applies the fluid is located at entrance or the exit of the filter, and is additionally included in the described of the filter
It is used for one or more of regional area applying vacuums to the filter at another in entrance or the outlet
Or the component of pressure, the component is including having another manifold of one or more valves, and the valve is with sealing the mistake
In the one or more tubes fits included in another conduit shell in the entrance of filter or outlet, the valve
It is one or more adapted to open and close with by one or more of regional areas corresponding to the filter
The conduit in it is one or more of come applying vacuum or pressure.
8. system according to claim 1, the system comprises additionally in the partial zones for measuring the filter
One or more sensors of the amount of the retentate in one or more of in domain.
9. a kind of method for being used to remove retentate from filter, methods described includes being used to apply a fluid to the filter
One or more regional areas it is described for removing and removing from one or more of regional areas of the filter
The step of retentate.
10. method according to claim 9, methods described comprises additionally in following steps：
Stop the fluid of one in the regional area by the filter after the time by scheduled volume
Flowing；
The nozzle is moved to other regional areas of the filter；And
Repeated the above steps for each in other regional areas of the filter.
11. method according to claim 9, methods described comprises additionally in following steps：
The ginseng in one in the regional area of the filter is measured after the time Jing Guo predetermined minimum amount
Number；
If the parameter is in predetermined value after the time Jing Guo the predetermined minimum amount, stop passing through the filter
The regional area in one fluid the flowing；
The nozzle is moved to other regional areas of the filter；And
Repeated the above steps for each in other regional areas of the filter.
12. method according to claim 11, methods described comprises additionally in following steps：
If after the time Jing Guo the predetermined minimum amount in one in the regional area of the filter
The parameter be not at the predetermined value, then the part of the filter is continued through on the maximum amount of time is made a reservation for
The flowing of one fluid in region；
If by it is described make a reservation for the maximum amount of time after the filter the regional area in it is one in
The parameter be in the predetermined value, then stop by one described in the regional area of the filter
The flowing of fluid；And
Repeated the above steps for each in other regional areas of the filter.
13. method according to claim 12, methods described comprises additionally in following steps：If made a reservation for most by described
The parameter after the substantial amounts of time in one in the regional area of the filter is not at described predetermined
Value, the then repeatedly step of claim 11 and 12.
14. method according to claim 13, wherein during the parameter is the regional area by the filter
One or more of fluids flow velocity, and comprise additionally in following steps：If when passing through predetermined amount of
Between after the flow velocity of the fluid stop on predetermined threshold, then by the regional area of the filter
The flowing of one or more of fluids.
15. method according to claim 9, the step of methods described comprises additionally in the hot recycling for implementing the filter.
16. method according to claim 9, methods described comprises additionally in following steps：The fluid is applied described
To the filter one or more of regional areas the step of before or after, check and analyze the filter
One or more of regional areas.
17. method according to claim 16, wherein described check and analyze the one or more of of the filter
The step of regional area, comprises the following steps：Measure the filter weight, retentate volume, filter passages length, ooze remaining
One or more of position of retentate in one or more of regional areas of thing composition or the filter.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US201462079545P | 2014-11-13 | 2014-11-13 | |
| US62/079545 | 2014-11-13 | ||
| PCT/US2015/060140 WO2016077452A2 (en) | 2014-11-13 | 2015-11-11 | Filter retentate removal system and method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106999820A true CN106999820A (en) | 2017-08-01 |
Family
ID=59422561
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201580061145.5A Pending CN106999820A (en) | 2014-11-13 | 2015-11-11 | Filter retentate removes system and method |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP3218082A2 (en) |
| CN (1) | CN106999820A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107670421A (en) * | 2017-10-16 | 2018-02-09 | 从佳乐 | A kind of emission-control equipment based on industrial machinery |
| CN107718165A (en) * | 2017-11-23 | 2018-02-23 | 深圳市共享能源技术有限公司 | Air knife apparatus |
| CN107744699A (en) * | 2017-11-30 | 2018-03-02 | 中车（天津）轨道交通设备有限公司 | Automatic blasting air filtration system for means of transport air inlet |
| CN111420468A (en) * | 2020-04-02 | 2020-07-17 | 乾亨贸易(杭州)有限公司 | Sintered plate repairing process method |
| CN113195315A (en) * | 2018-12-11 | 2021-07-30 | 伟摩有限责任公司 | Actuated injector system |
| CN113301976A (en) * | 2019-01-09 | 2021-08-24 | 克诺尔商用车制动系统有限公司 | Method for connecting a filter to a component and system consisting of a filter and a component |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2769529Y (en) * | 2003-01-07 | 2006-04-05 | 中国环境科学研究院 | Diesel engine exhaust particulate filter electric heating regeneration automatic controlling system |
| US20110146721A1 (en) * | 2009-12-18 | 2011-06-23 | Caterpillar, Inc. | Filter cleaning tool and method |
| CN202277760U (en) * | 2011-10-19 | 2012-06-20 | 江苏省宜兴非金属化工机械厂有限公司 | Efficient backflushing structure of smoke filter |
| CN102698546A (en) * | 2012-05-31 | 2012-10-03 | 中国石油大学(北京) | Pulse reverse blowing ash removal device of ceramic filter |
| CN102698533A (en) * | 2012-07-03 | 2012-10-03 | 高境 | Back blowing ash removing mechanism unit of bag filter and control method thereof |
| JP2013116451A (en) * | 2011-12-05 | 2013-06-13 | Ud Trucks Corp | Dpf cleaning device and cleaning method |
-
2015
- 2015-11-11 EP EP15802260.8A patent/EP3218082A2/en not_active Withdrawn
- 2015-11-11 CN CN201580061145.5A patent/CN106999820A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2769529Y (en) * | 2003-01-07 | 2006-04-05 | 中国环境科学研究院 | Diesel engine exhaust particulate filter electric heating regeneration automatic controlling system |
| US20110146721A1 (en) * | 2009-12-18 | 2011-06-23 | Caterpillar, Inc. | Filter cleaning tool and method |
| CN202277760U (en) * | 2011-10-19 | 2012-06-20 | 江苏省宜兴非金属化工机械厂有限公司 | Efficient backflushing structure of smoke filter |
| JP2013116451A (en) * | 2011-12-05 | 2013-06-13 | Ud Trucks Corp | Dpf cleaning device and cleaning method |
| CN102698546A (en) * | 2012-05-31 | 2012-10-03 | 中国石油大学(北京) | Pulse reverse blowing ash removal device of ceramic filter |
| CN102698533A (en) * | 2012-07-03 | 2012-10-03 | 高境 | Back blowing ash removing mechanism unit of bag filter and control method thereof |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107670421A (en) * | 2017-10-16 | 2018-02-09 | 从佳乐 | A kind of emission-control equipment based on industrial machinery |
| CN107718165A (en) * | 2017-11-23 | 2018-02-23 | 深圳市共享能源技术有限公司 | Air knife apparatus |
| CN107718165B (en) * | 2017-11-23 | 2024-02-13 | 广州共享能源科技有限公司 | Air knife device |
| CN107744699A (en) * | 2017-11-30 | 2018-03-02 | 中车（天津）轨道交通设备有限公司 | Automatic blasting air filtration system for means of transport air inlet |
| CN107744699B (en) * | 2017-11-30 | 2023-06-27 | 中车（天津）轨道交通设备有限公司 | Automatic blowing and air filtering system for air inlet of transport means |
| CN113195315A (en) * | 2018-12-11 | 2021-07-30 | 伟摩有限责任公司 | Actuated injector system |
| US11691598B2 (en) | 2018-12-11 | 2023-07-04 | Waymo Llc | Actuated sprayer system |
| CN113301976A (en) * | 2019-01-09 | 2021-08-24 | 克诺尔商用车制动系统有限公司 | Method for connecting a filter to a component and system consisting of a filter and a component |
| CN113301976B (en) * | 2019-01-09 | 2023-09-26 | 克诺尔商用车制动系统有限公司 | Method for connecting a filter to a component and system comprising a filter and a component |
| CN111420468A (en) * | 2020-04-02 | 2020-07-17 | 乾亨贸易(杭州)有限公司 | Sintered plate repairing process method |
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|---|---|
| EP3218082A2 (en) | 2017-09-20 |
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Application publication date: 20170801 |