Fabric Filters

Air Control Techniques, P.C. helps industrial clients optimize performance of a wide variety of fabric filters including pulse jet, plenum pulse, reverse air (conventional), reverse air positive pressure, and specialized high temperature units.

We help industrial clients identify and solve fabric filter problems such as:

  • Premature bag failure

  • Cleaning-related seepage

  • Excessive static pressure drop

  • Corrosion and acid attack of filter media

  • Air infiltration

  • Compressed air leakage and compressed air quality

  • Abrasion damage of filter media

  • Inadequate filter media cleaning

  • Hopper discharge problems

  • Poppet and bypass damper erosion, sealing problems, and maladjustment

  • High temperature damage of the filter media

  • Compartment gas flow distribution

  • Instrumentation failure
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Condensable Particulate Matter Test Method and the New Dry Impinger Test Method Developed by Air Control Techniques, P.C.

Air Control Techniques, P.C. developed a modified version of conventional Method 202 to minimize the biases to higher-than-true test results caused by aqueous phase reactions of soluble gases absorbed into the Method 202 impinger solutions. We have termed this the "Dry Impinger" version of Method 202.

Conventional Method 202 often provides unusually high and imprecise condensable particulate matter emission rate data when used for sources containing sulfur dioxide, nitrogen dioxide, ammonia, or soluble organic gases. The "Dry Impinger" Method 202 developed by Air Control Techniques, P.C. successfully minimizes the inadvertent conversion of gases to condensable particulate matter in the conventional Method 202 impingers by indirect-cooling of the sample gas stream instead of direct gas-liquid contact in the impingers.

Tests conducted by Air Control Techniques, P.C. and summarized in a paper presented at an AWMA Conference (http://www.epa.gov/ttn/emc/methods/m202doc3.pdf) demonstrated that the positive bias in Method 202 is reduced to 10% to 15% of the previous levels (85% to 90% bias reduction) by these modifications to the sampling equipment. EPA has further refined the Dry Impinger Method and conducted follow-up tests that confirmed that the positive bias is reduced to less than 10% of previous levels and that this bias is often undetectable (90% to 100% bias reduction).

On March 25, 2009, EPA changed the status of the Dry Impinger method from "Other Test Method 028" (OTM 028) to Proposed Method 202. EPA has published a preamble in the Federal Register providing background information on this proposed method. Both the preamble and the proposed method are available at http://www.epa.gov/ttn/emc/proposed.html.

Air Control Techniques, P.C. encourages support for the Dry Impinger version of Method 202. Substantially more accurate and reproducible condensable particulate matter emissions data are provided by this new method.

Source operators and regulatory agencies wishing to accurately measure condensable particulate matter emissions should consider using the Dry Impinger version of Method 202 instead of conventional Method 202 while EPA completes the proposed method review process.

Air Control Techniques, P.C. can provide assistance to industrial sources attempting to obtain accurate condensable particulate matter emissions data.
 

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