Conductivity Dependence on Spray Electrification of Flammable Solvent

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  • Endo Yuta
    National Institute of Occupational Safety and Health, Japan, Electrical Safety Research Group

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  • 可燃性溶剤の噴霧帯電量と導電率の関係
  • カネンセイ ヨウザイ ノ フンム タイデンリョウ ト ドウデンリツ ノ カンケイ

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<p>The spray electrification of liquid sprayed from nozzles, that may cause explosions or fires in facilities handling combustible organic solvent, was experimentally investigated. The effects of conductivity were examined with the low conductivity liquid （mineral spirit） by adding the conductivity improving additive and it varied from 10-13 to 10-6 S/m. The charge generated by the spray electrification with the two types of 1-fluid nozzles （stainless steel made nozzle and PTFE made nozzle） was measured. Measurement results showed the charge of the spray nozzle and the sprayed liquid depended strongly on the conductivity and became maximum at 10-9-10-7 S/m. The charge of the stainless steel made nozzle became about half as large as the maximum value even at the high conductivity of 10-6 S/m. These results showed a possibility that the controlling the conductivity of liquid at around 10-10 S/m can reduce the spray electrification by about one digit of the maximum value.</p>

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