| 摘要 |
<p>A method of reducing the oil content of cuttings, in which the cuttings are introduced into a drum-shaped space, where an elevated temperature is predominant and subjected to a hammering treatment in that space and the drum-shaped space is permanently heated from without so that during the performance of the hammering treatment the temperature in the interior is maintained in the vicinity of, but below, the cracking temperature of the oil in the cuttings to be treated, while further the pressure in the spaces is maintained at a value of at least 0.3 bar gauge. An apparatus for the application of such a method comprises a hammer mill and a dust cyclone, the hammer mill comprising a drum-shaped body, a rotary shaft passed through a side wall of the drum and extending axially through the drum, which shaft can be connected to suitable driving means outside the drum, onto which rotary shaft hammers are mounted which extend into a direction substantially transverse to the shaft reaching up to the vicinity of the inner wall of the drum, the drum further comprises an inlet for feeding cuttings to the drum and outlets for discharging the mist formed in the apparatus in operation and the purified cuttings respectively, the outlet for the mist being connected to the dust cyclone and means being provided around the drum for continuously supplying heat to the drum wall and maintaining it at a high temperature.</p> |
