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by Albert Waltien & Valerie Anne Edwards

Test Suggestions for the Laboratory Evaluation of Alken Even-Flo®

  1. ASTM D935-66 (Corrosivity Test Procedure)
  2. ASTM D 971 (Interfacial Tension Test)
  3. ASTM D 473 (Sedimentation Evaluation)
  4. The Socony Mobil analytical test method 530-64 (Anti-screen clogging test)
  5. The US Bureau of Mining 5113 (Atomization Test)
  6. The setup of a miniature boiler (or similar device) in which treatment can be applied and results monitored.

Alken Even-Flo® has several effects on fuel oil storage, distribution and combustion which ultimately result on lowered operating cost. In this context, we include labor cost as part of operating cost.

 P. Schmidt*
describes what he calls direct and indirect benefits of using a fuel oil additive.

Direct benefits are those that are readily and easily apparent from visual observation: prevention of organic precipitation or sludge; dispersion of (existing) organic sediment; clean tanks, pipelines, strainers, preheaters, and oil; reduction of surface tensions; steadiness of flame and unrestricted liquid flow.

Indirect benefits are the ones resulting from, and directly related to, the first benefits. While some of these results may be small, they nevertheless add up to savings in fuel, increased heat, higher efficiency, and less maintenance: burners free of carbon; a steadier flame; less or no smoke; less and drier soot; better heat transfer through the flues; reduced stack temperatures; increased carbon dioxide; and less oil consumption.

To Schmidt's list of benefits from a good treatment, we would add that the ability to operate with less excess air provided by Alken Even-Flo® results in lowered sulfur trioxide in the flue gas (SO3 is the prime cause of "cold-end corrosion" in air heaters, etc.) and lowered formation of vanadium pentoxide in the furnace (V2O5 is the prime cause of slag).

Most of the above benefits can be seen by simple observation, over time, by operating personnel, or by simple stack gas tests. Of course, determination of actual boiler efficiency with and without the use of Alken Even-Flo® (a complex task) would also prove the point.

Ultimately, the benefits of Alken Even-Flo® are measured by the reduction in fuel and maintenance costs with Alken Even-Flo® against those costs, under identical conditions (or for the same amount of production or steam generated) without Alken Even-Flo®.

Suggested Tests for Evaluating the Field Performance of Alken Even-Flo®

  • Stack temperature (should decrease significantly)
  • CO2 (should increase)
  • SO2 (should increase slightly)
  • SO3 (should decrease significantly)
  • H2SO4 (should decrease significantly)
  • V2O5 (should decrease significantly)
  • BCURA probe test of stack acid dew point (should decrease significantly)
  • Oil Consumption (should decrease)
  • Frequency of Requirement for Maintenance and Repairs (prepare for an initial increase in filter changing, then decrease significantly - once residual sludge has been burned off)
  • Volume of smoke (should reduce significantly)
  • Soot volume and wetness (should reduce)
  • Heat transfer through the flues (should increase significantly)
  • Volume of Water Separated (for EF 910 only, should increase)
  • Additional Testing for Power Generating Plants
NPHR (Net Plant Heat Rate). This is the measure of total fuel heat input, expressed in Btu, divided by the net busbar power leaving the power plant, expressed in kWh. Note that NPHR typically varies with load, so any variation in average load during field trial, as compared to normal operation without the addition of Alken Even-Flo® treatment, should be taken into account. (This is a test normally performed by power plants).

*Schmidt, Paul F., Fuel Oil Manual, New York, NY, 1985, Industrial Press 

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