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化工生产过程中,有些原料、中间体、成品,需要过滤(一般均用真空抽滤)。在放料过滤时产生大量有毒蒸气和气体,一般都采用伞形排气罩,为了不影响操作,伞形罩离滤桶口一般较远(控制距离较远),影响排毒效果。如果缩小控制距离,则影响工人的观察和操作。滤桶边缘吸风(槽边吸风),滤布往往挡住吸口,也不宜采用。为此过滤桶的防毒措施,是化工生产较难解决的问题之一。
In the chemical production process, some raw materials, intermediates, and finished products need to be filtered (usually vacuum filtered). In the discharge filter produces a large number of toxic vapor and gas, generally umbrella exhaust hood, in order to not affect the operation, the umbrella hood is generally far from the filter barrel mouth (control distance is far), affect the detoxification effect. If the control distance is reduced, the observation and operation of workers will be affected. The suction edge of the filter barrel (suction at the edge of the tank) is often blocked by the filter cloth and should not be used. To this end, the anti-virus measures of the filter tank are one of the more difficult problems to be solved in chemical production.