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    • 2. 发明授权
    • Flow control system for erosive fluids
    • 侵蚀流体流量控制系统
    • US4687495A
    • 1987-08-18
    • US915388
    • 1986-10-06
    • James P. Maddox
    • James P. Maddox
    • B01D19/00
    • B01D19/0047
    • A system for pressure letdown and flow control of high-pressure erosive fluid streams containing gas, liquid and solid particles, such as process slurries used in coal gasification and liquefaction. Throttle valves presently used for this application suffer excessive impingement erosion and corrosion damage, leading to short valve lifetime even with super-resistant valve materials. The present invention uses pairs of fixed-geometry opposing nozzles whose jets meet head-on with consequent energy dissipation and stream containment at the reduced pressure. The only erosion encountered here is scouring of internal nozzle surfaces which is minor and permits long lifetimes to be attained with conventional materials. This system provides flow control by (1) varying the number of nozzle pairs which are on-line by use of on-off shutoff valves for stepwise flow increments, and (2) low-pressure-drop operation of a conventional throttle valve in the main line for proportional control within one step increment. Different nozzle designs accommodate supercritical, subcritical and gasless hydraulic flow.
    • 用于气体,液体和固体颗粒的高压侵蚀流体流的压力降低和流量控制系统,例如用于煤气化和液化的工艺浆料。 目前用于此应用的节流阀遭受过度的冲击腐蚀和腐蚀损坏,即使使用超级耐用阀门材料也能节省阀门寿命。 本发明使用成对的固定几何形状相对的喷嘴,其喷嘴在正面接合,从而减少了能量消耗和流体的流动。 这里遇到的唯一的侵蚀是内部喷嘴表面的冲刷,这是很小的并且可以用常规材料实现长寿命。 该系统通过以下方式提供流量控制:(1)通过使用开关截止阀来逐步流量增量来改变在线的喷嘴对的数量,以及(2)常规节流阀的低压降操作 一步增量的比例控制主线。 不同的喷嘴设计适应超临界,亚临界和无气体液压流。