Cleaning Wastewater Streams: Scrubbers

For the next few weeks we're going to look at some application examples from our Chemical E-Book, this week we'll focus on a method of cleaning up plant wastewater streams: Scrubbers. Wet scrubbers are effective air pollution control devices for removing particles and/or gases from industrial exhaust streams. Scrubber liquid normally has very low organics, but the outlet must be monitored due to ever changing concentrations.

Celebrating the Fourth..from a Distance

As fireworks soar sky high around the Fourth of July, so do injuries. As the holiday approaches, the Consumer Product Safety Commission (CPSC) demonstrated the power fireworks, legal and illegal.

According to the CPSC, last year five people were killed and more than 9,000 were injured in fireworks-related incidents, the majority in a 30-day period around July 4.

Those injuries ranging from cuts, scrapes to permanent disfigurement, including severe burns, amputation of fingers and serious eye trauma.

Is Your Old Oven Obsolete? Safety and Performance Improvements for Baking and Drying Applications

Baking and drying ovens have been workhorses in the food, textile, and paper industries for many decades – and many oven users have clung to decades-old equipment because profit margins can be low in their industry. Although many of these older ovens still function with roughly the same level of consistency, certain newer technologies can result in reduced operating costs and lower risks to production and personnel due to fewer shutdowns.

The Safety and Performance of your Printing Line: Summary

When selecting a flammability analyzer, it’s always a good idea to enlist the advice of a specialist in the field. Do not assume that the analyzer which was correct for a previous job will also be the right choice for another application. Whether new or similar, the specific details of each application need to be examined closely to prevent disaster.

The Safety and Performance of your Printing Line: Flame Temperature

The flame temperature analyzer measures the amount of heat given off by a pilot flame as it burns in an explosion-proof measuring chamber. The small, well-regulated flame heats the tip of a temperature sensor suspended directly above it.

The Safety and Performance of your Printing Line: Infrared Absorption

Combustible gases absorb infrared radiation at certain characteristic wavelengths. A typical non-dispersive infrared (NDIR) detector passes a source of infrared energy through the sample and measures the energy received by one of two detectors. The active detector responds to wavelengths in the same band as the sample gas, while the other detector measures a reference to compensate for changes within the instrument.

The Safety and Performance of your Printing Line: Catalytic Sensors

Catalytic-bead sensors are constructed of two small wire coils covered with a catalyst. One coil is “active” while the other is rendered inert and acts as a reference. A flow of electrical current through the internal coils heats the catalytic coating to a temperature at which the active coil will react with many flammable vapors and gases. This reaction occurs in the form of surface combustion which in turn causes an increase in the sensor’s temperature. The resulting temperature change is converted into an LFL reading.

The Safety and Performance of your Printing Line: Sensor Choices and How to Decide

Although several different types of sensors are employed as LFL monitors, each has an appropriate application to which it is best suited.

Fires and explosions in what was thought to be “protected” equipment can occur without warning when a sensor is not capable of doing the job that had been assigned to it.

This is most often caused by a misunderstanding of the different available technologies.

The Safety and Performance of your Printing Line: Application Examples

Typical Flexographic Application Examples Include:

  • Drying systems for printing lines
  • Abatement systems such as oxidizers

Processes that use flammable solvents can develop explosive concentrations due to failure of coating, metering, ventilation or heating systems, adverse chemical reactions, and human error.

LFL monitors are used for safety as well as process efficiency, protecting the system from fire and explosion while also allowing operating at higher vapor concentrations to save costs.

The Safety and Performance of your Printing Line: Failsafe

There are important considerations when choosing an LFL monitor: Response Accuracy, Response Speed, Condensation Issues and Failsafe.

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