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    • 4. 发明公开
    • PHOSPHINE FUMIGATION METHOD AND APPARATUS.
    • Verfahren und Apparat zur Phosphin-Begasung。
    • EP0508984A4
    • 1992-08-27
    • EP90909574
    • 1990-06-25
    • COMMW SCIENT IND RES ORG
    • WINKS ROBERT GORDON
    • A01M13/00A01M17/00A23B20060101A23B7/144A23B9/18A23B9/22A23K3/00A23L3/3409B02B5/00F17D1/04
    • A23B9/18
    • An economical, yet effective technique for fumigating grain and other particulate foodstuffs involves the passage through the grain or the like of a carrier gas containing phosphine. The concentration of the phosphine in the carrier gas is within the range of from 4 to 200 micrograms of phosphine per litre. The flow of the gas is at a constant linear velocity within the grain, and the gas leaves the grain mass at a velocity of from 0.5x10 to about 2 x 10 metres per second. In addition, fumigation of grain in a storage facility having a plurality of grain silos (13) is effected from a single source (10) of a gaseous fumigant. The single source of gaseous fumigant is connected to a gas supply duct (11), to which gas inlet ports of the silos are also connected. The connection between each gas inlet port and the duct is provided with a respective valve (14) and a respective orifice plate (15), which is adjusted so that the pressure drop across the plate into the silo is substantially greater than the pressure drop across any other component between the gas source and the silo. With apparatus arranged in this manner, the flow rate of gaseous fumigant through the grain-containing silos in the facility suffers only a minor perturbation when a valve between the duct and a silo is opened or closed. This minor perturbation can be readily compensated by maintaining the gas pressure in the duct at a constant value.
    • 用于熏蒸谷物和其它颗粒食物的经济而有效的技术涉及通过含有磷化氢的载气的谷物或类似物。 载气中磷化氢的浓度在每升4至200微克磷化氢的范围内。 气体的流动在颗粒内处于恒定线速度,并且气体以每秒0.5×10-4〜约2×10-4米的速度离开颗粒物质。 此外,在具有多个粮仓(13)的储存设施中熏蒸谷物是从气态熏蒸剂的单一来源(10)进行的。 气体熏蒸剂的单一源连接到气体供应管道(11),筒仓的气体入口端口也连接到气体供应管道(11)。 每个气体入口端口和管道之间的连接设置有相应的阀门(14)和相应的孔板(15),该孔板被调节成使跨板进入筒仓的压降大大高于横跨压降 气源与筒仓之间的任何其他部件。 利用以这种方式布置的装置,当管道和筒仓之间的阀打开或关闭时,气体熏蒸剂通过设施中的含谷仓的流量仅受到较小的扰动。 通过将管道中的气体压力维持在恒定值可以容易地补偿这种微小的扰动。