Agenda

Houston Material Handling Society

October 2008

Baghouse Cleaning Control

Presented by:T.J. Winalski

Copyright 2008Page 2

Agenda


Particulate Monitoring

Diagnostics

Overview


Baghouse Basics

•Baghouses can be very efficient in collecting particulate

•Media – many media types for different processes

•Pressure Loss (Drop) of a baghouse is function of:

– Baghouse Design– Media Type– Air Flow– Dust Layer Thickness

•Cleaning Media – All media needs to be periodically cleaned to maintain acceptable pressure drop

•Cleaning is controlled either by Time OR Differential Pressure


Pulse Jet Baghouse


Baghouse Basics

•Ensure cleaning air supply is sufficient (flow/pressure)

•Cleaning air supply should be clean and dry•Keep air to cloth ratio at acceptable levels•Avoid condensation in baghouse


Agenda



Diagnostics

Overview


Cleaning Pulse – The Beat of the Baghouse


Depth vs. Surface Filtration – Filtering Mode

Conventional Media Membrane Media

Depth filter mediae.g. PPS felt

Membrane

In - Depth Filter

Material (Felt)


Solenoid Activation: Current

Timer Board

– Controls Solenoid ON Time and OFF Time – OFF Time

• Adjustable off time 3-600 seconds

• Stand Alone of through Other Device


How does your baghouse heart beat?

istockphoto.com


Types of Cleaning Modes

•Time Only•Pulse On Demand•Single Set Point Hold


Pulse on Demand – 30 days

DP

(“

WC

)

Days4 12 20 28

2

4

DP


Single Set Point: Hold 4.0” WC

DP


Single Set-Point: Hold 4.7” WC

DP

Pulse Rate


Single Set-Point: Hold 4.0” WC

DP

Pulse Rate


Single Set Point: Hold 6.5” WC - 12 days

DP

Particulate


IntelliPulse – Single Set-point Control

DP

Pulse Rate


Single Set Point Hold Control: 1 day

Pulse Rate

DP


Single Set Point Hold = Even Filter Cake/Constant Air Flow


Single Set Point Hold - Benefits

•Constant Air Flow Through the Baghouse

•Minimum Compressed Air Use – for Cleaning

•Maximum Filter Life

•Reduced Maintenance due to longer component life

•Lowest Particulate Emissions


Single Set Point Hold – Total Pulse Count



Single Set Point HoldActual Electricity Savings from Compressed Air


Comprehensive Cleaning ControllerFunctionality

Cleaning Modes• Off• Time

– Once Through– Cycle Down

• Pressure– Single Set Point Hold– POD

Full Solenoid Control – Easily Selectable and Adjustable

•Multi-Row Pulsing•Pattern Pulsing

• Pulse Control for Each Individual Solenoid


Single Set Point Hold Control - Benefits

•Steady Differential Pressure by Maintaining Filter Cake •Constant Air Flow through Baghouse •Lowest Particulate Emissions•Optimum Operating Costs

– Maximum Media Life– Lowest Compressed Air Usage– Optimum Fan Volume – Minimize Maintenance Costs

through longer life of components


Requirements of Today’s Technology:

•Performance•Reliability•Flexibility•Information •Communication

•Comprehensive Cleaning Control

• Integrate Particulate Sensing

• Integrate Differential Pressure Sensing: Tube DP or Non-Clogging DP Transmitter

• Integrate I/O’s

•Ethernet/Fieldbus Communication


27

Non-Clogging Differential Pressure Transmitter


Inch

es o

f H

2O

Time (sec)-4

-2

0

2

4

6

8

10

0 500 1000 1500 2000 2500 3000 3500 4000

-2

0

2

4

6

8

10Flange – to Flange P

Compartment P provides insight:

35 minutesCleaning frequency

Variation in P amongst compartments

Some compartments are taking more flow

Differential Pressure Monitoring


Agenda



Diagnostics

Overview


Integration of Particulate Monitoring


Sensor Technology – Protected Probe


Particulate Emissions

Pulse Rate


Particulate Emissions

Filter Media Change


Particulate Monitoring with Broken Bag


Particulate Monitoring - Cement Kiln


Particulate and DP – over 6 days

DPParticulate


Particulate and DP – 1 day

DP

Particulate


Particulate Emissions: High Resolution

Particulate

DP


Particulate Monitor - Locations


Particulate Emissions – Maintenance Tool


Proactive Maintenance Tool: MicroFractures

DP

(“

WC

)

Days4 12 20 28

2

4

DP

Particulate


Agenda



Diagnostics

Overview


Which would you prefer?


Diagnostic Capability

Instrumentation is the window into the process

•Failed Solenoids

•Failed Diaphragm (header pressure)

•Failed Filter by Row (particulate)

•Process Conditions – high DP, low Header Pressure, air temperatures, moisture, fan vibration, bearing temperatures, etc.


Typical Baghouse


PARTICULATE SENSOR

•Passive Sensor

•Protected Probe Technology

• Mounted in clean air duct

DELTA P SENSOR

•Non-Clogging Type for reliable maintenance free measurement

•Mounted on Dirty Side

•Accurate Reliable Measured Differential Pressure

•Quick Clamp Connection

COMPRESSED AIR SENSOR

•Checks compressed air (gas) header pressure

•Mounted in the compressed gas manifold


• Bag Row Leaks• Particulate • Failed Individual Solenoid• Failed Individual Diaphragm• Header Pressure Compressed Air (Gas)• Differential Pressure

Read Locally Or On HMI

Diagnostics


Visualization


Conclusion

•Comprehensive Cleaning Control

•Operate as a Stand Alone Controller (harsh industrial environments)

•Operate out of the box for any baghouse, bin vent to 80 row baghouse

•Reliably Monitor Particulate Emissions

•Communicate with a HMI


Questions, Discussions,

Applications


THANK YOU !!


MICS Platform

•Power Supply•IntelliPulse Triac Modules•Tube Type DP Module•I/O Modules•Particulate Modules•Fieldbus Communications•Internal DataLogging (removable SD Card)•Comprehensive Graphic Display


Cleaning Control/Diagnostic Technology

•Modular Instrument Control System – adds functionality as required

Basic Control System Remote I/O’s installed at baghouse

(minimize installation)

Documents

Agenda