| 摘要 |
Protection device for apparatuses and pipework for pneumatic transportation of pulverulent materials, with a view to suppressing or greatly reducing the depositing and sticking of these pulverulent materials on the internal walls of the said apparatuses and pipework. This device comprises at least one electrical conductor 2 mounted outside the said apparatus or the said pipework 1, the said conductor being on the one hand earthed 4 and on the other hand connected electrically to the outer wall of the said apparatus or of the said pipework at at least two points 3; the ratio R1/R2 between the electrical resistance of the said conductor and that of the said apparatus or of the said pipework, expressed in ohms, is less than 1, preferably less than or equal to 0.1, and more particularly between 0.1 and 0.01. <IMAGE>
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