WO2008029113A1 - Filter monitor - Google Patents

Filter monitor Download PDF

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Publication number
WO2008029113A1
WO2008029113A1 PCT/GB2007/003325 GB2007003325W WO2008029113A1 WO 2008029113 A1 WO2008029113 A1 WO 2008029113A1 GB 2007003325 W GB2007003325 W GB 2007003325W WO 2008029113 A1 WO2008029113 A1 WO 2008029113A1
Authority
WO
WIPO (PCT)
Prior art keywords
filter
sample
lines
upstream
particle detector
Prior art date
Application number
PCT/GB2007/003325
Other languages
French (fr)
Inventor
Philip Richard Pendrill
Original Assignee
Philip Richard Pendrill
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Philip Richard Pendrill filed Critical Philip Richard Pendrill
Priority to GB0906116A priority Critical patent/GB2456249A/en
Publication of WO2008029113A1 publication Critical patent/WO2008029113A1/en

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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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • B01D46/442—Auxiliary equipment or operation thereof controlling filtration by measuring the concentration of particles
    • 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
    • B01D46/0084—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours provided with safety means
    • B01D46/0086—Filter condition indicators
    • 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
    • B01D46/42—Auxiliary equipment or operation thereof
    • B01D46/44—Auxiliary equipment or operation thereof controlling filtration
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/20—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point using special tracer materials, e.g. dye, fluorescent material, radioactive material
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/26—Devices for withdrawing samples in the gaseous state with provision for intake from several spaces
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2247—Sampling from a flowing stream of gas
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/06—Investigating concentration of particle suspensions
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N1/00—Sampling; Preparing specimens for investigation
    • G01N1/02—Devices for withdrawing samples
    • G01N1/22—Devices for withdrawing samples in the gaseous state
    • G01N1/2202—Devices for withdrawing samples in the gaseous state involving separation of sample components during sampling
    • G01N2001/222—Other features
    • G01N2001/2223—Other features aerosol sampling devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
    • G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
    • G01N2015/084—Testing filters
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
    • G01N33/0004—Gaseous mixtures, e.g. polluted air
    • G01N33/0009—General constructional details of gas analysers, e.g. portable test equipment
    • G01N33/0026—General constructional details of gas analysers, e.g. portable test equipment using an alternating circulation of another gas

Definitions

  • the present invention relates to a monitor for monitoring performance of a filter in use.
  • filter inefficiency causes inefficiency in the turbine itself, due to build up of dust on aerodynamic surfaces.
  • the first indication that the filter element should have been replaced already is given by a fall off in performance to a stage where the turbine needs to be taken out of service for washing.
  • the turbine down time for washing is much more expensive than that for filter element replacement.
  • the object of the present invention is to provide an improved filter monitor.
  • a filter monitor comprising:
  • the monitor could be operated manually, it is preferable for it to include a controller adapted and arranged to control the monitor to perform repeated monitoring cycles.
  • cycles can be envisaged, for instance each sampling line being purged for a period before a sample is passed through it, followed by the other line being purged and then having a sample passed through it.
  • both lines can be purged alternately and then samples are taken sequentially from the two probes.
  • both lines can be purged together and then samples are taken sequentially from the two probes. This obviates the risk of misleading results due to change of ambient conditions.
  • the purging periods are an order of magnitude longer than the sampling periods.
  • the means for alternate sampling connection and for purging connection can be distinct or separate, in that same valve or valves can be used for both functions or different valves can be used,
  • the means for connection of the purging fluid can be arranged to pass the purging fluid through the particle detector as well as the sample lines.
  • the line for the purging fluid is connected upstream (of the direction of sample flow) of the particle detector.
  • the purging fluid may be free to pass into the particle detector, but restrained by lack of an outlet, or as is preferred, a valve may be provided to isolate the detector from the purging fluid.
  • the particle detector will be provided with a pump for drawing the samples through it.
  • the probes are adapted for their inlet orifices to face into the flow being sampled.
  • they are provided with additional orifices for measuring the pressure head differential between their positions, namely up- and down-stream of a filter being monitored.
  • FIG. 1 is a block diagram of a filter monitor of the invention installed at a duct having a filter;
  • Figure 2 is a side view of a sampling probe of the filter monitor of Figure 1.
  • an inlet duct 101 to a gas turbine (not shown) has an inlet air filter 102.
  • the filter is provided to remove dust from the inlet air flow 103, which can otherwise degrade the efficiency of the gas turbine and/or cause wear of the turbine.
  • a filter monitor Associated with the duct is a filter monitor 1, having up- and down-stream probes 2,3 mounted in the side wall 104 of the duct, one 2 upstream of the filter 102 and the other.3 downstream of it.
  • a laser particle counter 4 Central to the monitor is a laser particle counter 4, which is a known product in itself.
  • Up- and down-stream sample lines 5,6 lead from the probes to respective two-way, three-port, electro-actuated valves 7,8, connected to an inlet 9 of the particle counter.
  • a pump 10 is provided at the outlet 1 1 of the counter.
  • a source of compressed air 12 having a pressure regulator 14 and a filter 15 in its output line 16, which branches to the two valves 7,8.
  • the probes 2,3 have pointed, hollow noses 17 facing into the air stream.
  • the noses communicate via central tubes 20 with the respective sample lines 5,6.
  • Outer tubes 21 communicate the pressure head at the collars 18 via further lines 22 to a differential pressure transducer 23.
  • the outer tubes 21 cany flanges by which the probes are otherwise sealed to the duct side wall 104.
  • a micro-controller 24 is connected to the valves 7,8 for controlling their state in accordance with a sampling/purging cycle. Via data lines 25, 26, the micro- controller is connected to the particle counter 4 and the differential pressure transducer 23.
  • the monitor is set to purge mode.
  • the pump 10 maintains a reduced pressure in the counter, with the valves 7,8 closing its inlet 9.
  • the valves allow pressure air to pass as a purging flow from the line 16 into the sample lines 5,6. This obviates particle deposit in the lines, such as might disturb measurements of the counter 4. This is the state of valve 8 shown in Figure 1.
  • one of the valves is set to allow sample air from its probe to be passed by the pump through the counter. This is the state of valve 8 shown in Figure 1.
  • the sampling is carried out for one minute, which allows the counter to settle to a steady reading and this to be recorded in the micro-controller.
  • a sample is similarly drawn from the other side of the filter. 102 and its reading logged.
  • the flow into the probes is drawn in at the same speed as the surrounding flow, i.e. it is isokinetic.
  • the differential pressure across the filter is also logged.
  • the logged particle counts up- and down-stream of the filter, together with the corresponding differential pressures, are downloaded at regular intervals via an internet line 27 to a remote station.
  • the above described filter monitor has the advantage of monitoring the filter in real time, whereby fall off in efficiency, namely passage through the filter of a higher percentage of the material intended to be filtered, can be monitored and the filter element replaced in good time before the gas turbine whose inlet air is being filtered requires to be taken out of service for washing.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Physics & Mathematics (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Molecular Biology (AREA)
  • Biomedical Technology (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Sampling And Sample Adjustment (AREA)

Abstract

An inlet duct (101) to a gas turbine (not shown) has an inlet air filter (102). The filter is provided to remove dust from the inlet air flow (103), which can otherwise degrade the efficiency of the gas turbine and/or cause wear of the turbine. Associated with the duct is a filter monitor (1), having up- and down-stream probes (2, 3) mounted in the side wall (104) of the duct, one (2) upstream of the filter (102) and the other (3) downstream of it. Central to the monitor is a laser particle counter (4). Up- and down-stream sample lines (5, 6) lead from the probes to respective two-way, three-port, electro-actuated valves (7, 8), connected to an inlet (9) of the particle counter. A pump (10) is provided at the outlet (11) of the counter A micro-controller (24) is connected to the valves (7, 8) for controlling their state in accordance with a sampling/purging cycle. Via data line (25), the micro-controller is connected to the particle counter (4).

Description

FILTER MONITOR
The present invention relates to a monitor for monitoring performance of a filter in use.
Conventionally filter performance is monitored by measuring pressure difference across the filter. However, in some circumstances, a filter can fail to block fine dust without a significant increase in differential pressure across it being apparent.
In a gas turbine installation, filter inefficiency causes inefficiency in the turbine itself, due to build up of dust on aerodynamic surfaces. In some installations, the first indication that the filter element should have been replaced already is given by a fall off in performance to a stage where the turbine needs to be taken out of service for washing. The turbine down time for washing is much more expensive than that for filter element replacement.
The object of the present invention is to provide an improved filter monitor.
According to the invention there is provided a filter monitor comprising:
• a particle detector having an inlet and an outlet;
• an upstream probe positionable in use upstream of a filter;
• an upstream sample line connected to the upstream probe;
• a downstream probe positionable in use downstream of a filter; • a downstream sample line connected to the downstream probe; and
• means for:
• alternate connection of the upstream and downstream sample lines and probes to the inlet of the particle detector for detection of particles in a flow to and from the filter, and for • connection of purging fluid into the samples lines to purge them of particles intermediate sampling connections. Whilst it is conceivable that the monitor could be operated manually, it is preferable for it to include a controller adapted and arranged to control the monitor to perform repeated monitoring cycles. A variety of cycles can be envisaged, for instance each sampling line being purged for a period before a sample is passed through it, followed by the other line being purged and then having a sample passed through it. Again, both lines can be purged alternately and then samples are taken sequentially from the two probes. However in the preferred embodiment, both lines can be purged together and then samples are taken sequentially from the two probes. This obviates the risk of misleading results due to change of ambient conditions.
Preferably, the purging periods are an order of magnitude longer than the sampling periods.
The means for alternate sampling connection and for purging connection can be distinct or separate, in that same valve or valves can be used for both functions or different valves can be used,
Again, the means for connection of the purging fluid can be arranged to pass the purging fluid through the particle detector as well as the sample lines. However in the preferred embodiment, the line for the purging fluid is connected upstream (of the direction of sample flow) of the particle detector. Again the purging fluid may be free to pass into the particle detector, but restrained by lack of an outlet, or as is preferred, a valve may be provided to isolate the detector from the purging fluid.
Normally, the particle detector will be provided with a pump for drawing the samples through it.
Conveniently the probes are adapted for their inlet orifices to face into the flow being sampled. Preferably they are provided with additional orifices for measuring the pressure head differential between their positions, namely up- and down-stream of a filter being monitored.
In the preferred embodiment, the controller is integrated with a data logger for logging periodic measurements and a transceiver for remote interrogation. To help understanding of the invention, a specific embodiment thereof will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a block diagram of a filter monitor of the invention installed at a duct having a filter;
Figure 2 is a side view of a sampling probe of the filter monitor of Figure 1.
Referring to the drawings, an inlet duct 101 to a gas turbine (not shown) has an inlet air filter 102. The filter is provided to remove dust from the inlet air flow 103, which can otherwise degrade the efficiency of the gas turbine and/or cause wear of the turbine.
Associated with the duct is a filter monitor 1, having up- and down-stream probes 2,3 mounted in the side wall 104 of the duct, one 2 upstream of the filter 102 and the other.3 downstream of it. Central to the monitor is a laser particle counter 4, which is a known product in itself. Up- and down-stream sample lines 5,6 lead from the probes to respective two-way, three-port, electro-actuated valves 7,8, connected to an inlet 9 of the particle counter. A pump 10 is provided at the outlet 1 1 of the counter.
A source of compressed air 12 having a pressure regulator 14 and a filter 15 in its output line 16, which branches to the two valves 7,8.
The probes 2,3 have pointed, hollow noses 17 facing into the air stream.
Behind their noses, they incorporate pressure head collars 18, having a ring of tappings 19. The noses communicate via central tubes 20 with the respective sample lines 5,6. Outer tubes 21 communicate the pressure head at the collars 18 via further lines 22 to a differential pressure transducer 23. The outer tubes 21 cany flanges by which the probes are otherwise sealed to the duct side wall 104.
A micro-controller 24 is connected to the valves 7,8 for controlling their state in accordance with a sampling/purging cycle. Via data lines 25, 26, the micro- controller is connected to the particle counter 4 and the differential pressure transducer 23.
For the greater part of each cycle, typically 58 minutes in each hour, the monitor is set to purge mode. In this the pump 10 maintains a reduced pressure in the counter, with the valves 7,8 closing its inlet 9. At the same time, the valves allow pressure air to pass as a purging flow from the line 16 into the sample lines 5,6. This obviates particle deposit in the lines, such as might disturb measurements of the counter 4. This is the state of valve 8 shown in Figure 1.
At the end of the 58 minute purge cycle, one of the valves is set to allow sample air from its probe to be passed by the pump through the counter. This is the state of valve 8 shown in Figure 1. Typically the sampling is carried out for one minute, which allows the counter to settle to a steady reading and this to be recorded in the micro-controller. During the next minute, a sample is similarly drawn from the other side of the filter. 102 and its reading logged. For minimum disturbance of the flow by the sampling - and resultant in accuracy - the flow into the probes is drawn in at the same speed as the surrounding flow, i.e. it is isokinetic.
The differential pressure across the filter is also logged.
For monitoring when the filter is losing efficiency, the logged particle counts up- and down-stream of the filter, together with the corresponding differential pressures, are downloaded at regular intervals via an internet line 27 to a remote station.
It will be appreciated that the above described filter monitor has the advantage of monitoring the filter in real time, whereby fall off in efficiency, namely passage through the filter of a higher percentage of the material intended to be filtered, can be monitored and the filter element replaced in good time before the gas turbine whose inlet air is being filtered requires to be taken out of service for washing.
However, it should be noted that the invention is not intended to be restricted to use in connection with gas turbine filters.

Claims

CLAIMS:
1. A filter monitor comprising:
• a particle detector having an inlet and an outlet;
• an upstream probe positionable in use upstream of a filter; • an upstream sample line connected to the upstream probe;
• a downstream probe positionable in use downstream of a filter;
• a downstream sample line connected to the downstream probe; and
• connection means for:
• alternate connection of the upstream and downstream sample lines and probes to the inlet of the particle detector for detection of particles in a flow to and from the filter, and for
• connection of purging fluid into the samples lines to purge them of particles intermediate sampling connections.
2. A filter monitor as claimed in claim 1, including a controller adapted and arranged to control the monitor to perform repeated monitoring cycles by control of the connection means and the particle detector. . . .. , - .
3. A filter monitor as claimed in claim 2, wherein the controller is programmed to successively:
• purge one of the upstream and down sample lines, • pass a sample down this one line to the particle detector,
• purge the other one of the upstream and down sample lines and
• pass a sample down this other line to the particle detector.
4. A filter monitor as claimed in claim 2, wherein the controller is programmed to successively: • purge one of the upstream and down sample lines,
• purge the other one of the upstream and down sample lines,
• pass a sample down one of the lines to the particle detector and
• pass a sample down the other of the lines to the particle detector.
5. A filter monitor as claimed in claim 2, wherein the controller is programmed to successively:
• purge both of the upstream and down sample lines simultaneously,
• pass a sample down one of the lines to the particle detector and
• pass a sample down the other of the lines to the particle detector.
6. A filter monitor as claimed in claim 3, claim 4 or claim 5, wherein the controller is programmed so that periods during which the lines are purged are controlled to be of an order of magnitude greater than periods during samples are passed.
7. A filter monitor as claimed in any preceding claim, wherein the connection means includes at least one valve for effecting both sampling connection and purging connection.
8. A filter monitor as claimed in any one of claims 1 to 6, wherein the connection means includes at least one valve for effecting both sampling connection and at least one other valve for effecting purging connection.
9. A filter monitor as claimed in any preceding claim, wherein the means for connection of the purging fluid is arranged to pass the purging fluid through the particle detector as well as the sample lines.
10. A filter monitor as claimed in any one of claims 1 to 8, wherein the means for connection of the purging fluid includes a line for the purging fluid connected upstream (of the direction of sample flow) of the particle detector.
11. A filter monitor as claimed in claim 10, wherein the purging fluid is free to pass into the particle detector, but restrained from doing so by lack of an outlet.
12. A filter monitor as claimed in claim 10, including a valve arranged to isolate the detector from the purging fluid.
13. A filter monitor as claimed in any preceding claim, wherein the particle detector is provided with a pump for drawing the samples through it.
14. A filter monitor as claimed in any preceding claim, wherein the probes are adapted for inlet orifices into them- to face into the flow being sampled.
15. A filter monitor as claimed in claim 14, wherein the probes are provided with additional orifices for measuring a pressure head differential between their positions, namely up- and down-stream of a filter being monitored, the inlet orifices of the probes being connected to central tubes via which the probes are connected to their sample lines and outer tubes via which the additional orifices are connected for pressure differential measurement.
16. A filter monitor as claimed in claim 15, including a differential pressure transducer to which the additional orifices are connected, via the outer tubes.
17. A filter monitor as claimed in any preceding claim, wherein the controller is integrated with a data logger for logging periodic measurements and a transceiver for remote interrogation.
PCT/GB2007/003325 2006-09-08 2007-09-04 Filter monitor WO2008029113A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB0906116A GB2456249A (en) 2006-09-08 2007-09-04 Filter Monitor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB0617674.7 2006-09-08
GB0617674A GB0617674D0 (en) 2006-09-08 2006-09-08 Filter monitor

Publications (1)

Publication Number Publication Date
WO2008029113A1 true WO2008029113A1 (en) 2008-03-13

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2007/003325 WO2008029113A1 (en) 2006-09-08 2007-09-04 Filter monitor

Country Status (2)

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GB (2) GB0617674D0 (en)
WO (1) WO2008029113A1 (en)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8477043B2 (en) 2010-09-17 2013-07-02 General Electric Company Member integrity monitoring system and method
CN103830974A (en) * 2012-11-22 2014-06-04 丹东东方测控技术有限公司 Energy-saving and high-efficiency micropower dust removing device and method
CN103830973A (en) * 2012-11-22 2014-06-04 丹东东方测控技术有限公司 Micro-power dust removing device and method capable of alarming filterability deterioration
GB2522460A (en) * 2014-01-25 2015-07-29 Kenneth James Mollison Particle counter, particle size estimator, solids mass flow estimator and failed filter detector for inlet air systems
CN112557073A (en) * 2020-11-19 2021-03-26 飞潮（无锡）过滤技术有限公司 High-temperature flue gas single-tube filter element test platform and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057515A1 (en) * 1999-05-21 2000-12-06 KRANTZ - TKT GmbH Process and device for in-place determination of the filtration efficiency of a filter device
WO2002041974A1 (en) * 2000-11-23 2002-05-30 Ados Gmbh Mess- Und Regeltechnik Method for monitoring filtering installations
WO2006017143A1 (en) * 2004-07-11 2006-02-16 Lighthouse Worldwide Solutions, Inc. Lateral manifold for a multiple sample locations sensor and method for collection
WO2006058312A2 (en) * 2004-11-29 2006-06-01 Arthur Jones T Jr Apparatus and method of contaminant detection for food industry

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1057515A1 (en) * 1999-05-21 2000-12-06 KRANTZ - TKT GmbH Process and device for in-place determination of the filtration efficiency of a filter device
WO2002041974A1 (en) * 2000-11-23 2002-05-30 Ados Gmbh Mess- Und Regeltechnik Method for monitoring filtering installations
WO2006017143A1 (en) * 2004-07-11 2006-02-16 Lighthouse Worldwide Solutions, Inc. Lateral manifold for a multiple sample locations sensor and method for collection
WO2006058312A2 (en) * 2004-11-29 2006-06-01 Arthur Jones T Jr Apparatus and method of contaminant detection for food industry

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8477043B2 (en) 2010-09-17 2013-07-02 General Electric Company Member integrity monitoring system and method
CN103830974A (en) * 2012-11-22 2014-06-04 丹东东方测控技术有限公司 Energy-saving and high-efficiency micropower dust removing device and method
CN103830973A (en) * 2012-11-22 2014-06-04 丹东东方测控技术有限公司 Micro-power dust removing device and method capable of alarming filterability deterioration
GB2522460A (en) * 2014-01-25 2015-07-29 Kenneth James Mollison Particle counter, particle size estimator, solids mass flow estimator and failed filter detector for inlet air systems
CN112557073A (en) * 2020-11-19 2021-03-26 飞潮（无锡）过滤技术有限公司 High-temperature flue gas single-tube filter element test platform and application thereof

Also Published As

Publication number Publication date
GB0906116D0 (en) 2009-05-20
GB0617674D0 (en) 2006-10-18
GB2456249A (en) 2009-07-15

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