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    • 1. 发明授权
    • Control method for mixed refrigerant based natural gas liquefier
    • 混合制冷剂天然气液化器的控制方法
    • US06530240B1
    • 2003-03-11
    • US10013243
    • 2001-12-10
    • Kenneth J. KountzPatrick M. Bishop
    • Kenneth J. KountzPatrick M. Bishop
    • F25J100
    • F04C28/26F04C18/16F04C28/06F04C28/08F04C29/026F25B1/047F25B9/006F25B43/02F25B45/00F25B49/025F25B2400/16F25B2600/021F25J1/0022F25J1/0052F25J1/0212F25J1/0279F25J1/0284F25J1/0298F25J2280/10F25J2280/20Y02B30/741
    • In a natural gas liquefaction system having a refrigerant storage circuit, a refrigerant circulation circuit in fluid communication with the refrigerant storage circuit, and a natural gas liquefaction circuit in thermal communication with the refrigerant circulation circuit, a method for liquefaction of natural gas in which pressure in the refrigerant circulation circuit is adjusted to below about 175 psig by exchange of refrigerant with the refrigerant storage circuit. A variable speed motor is started whereby operation of a compressor is initiated. The compressor is operated at full discharge capacity. Operation of an expansion valve is initiated whereby suction pressure at the suction pressure port of the compressor is maintained below about 30 psig and discharge pressure at the discharge pressure port of the compressor is maintained below about 350 psig. Refrigerant vapor is introduced from the refrigerant holding tank into the refrigerant circulation circuit until the suction pressure is reduced to below about 15 psig, after which flow of the refrigerant vapor from the refrigerant holding tank is terminated. Natural gas is then introduced into a natural gas liquefier, resulting in liquefaction of the natural gas.
    • 在具有制冷剂储存回路,与制冷剂储存回路流体连通的制冷剂循环回路和与制冷剂循环回路热连通的天然气液化回路的天然气液化系统中,液化天然气的方法,其中压力 在制冷剂循环回路中,通过制冷剂与制冷剂储存回路的交换而调节到低于约175psig。 启动变速电动机,从而启动压缩机的操作。 压缩机以全放电容量运行。 启动膨胀阀的操作,由此压缩机的吸入压力端口处的吸入压力保持在约30psig以下,压缩机的排出压力端口处的排出压力保持在约350psig以下。 制冷剂蒸气从制冷剂储存罐引入制冷剂循环回路,直到吸入压力降低到约15psig以下,此后制冷剂储存罐的制冷剂蒸汽流过终止。 然后将天然气引入天然气液化器中,导致天然气液化。
    • 3. 发明授权
    • Control system for regulating large capacity rotating machinery
    • 用于调节大容量旋转机械的控制系统
    • US4282719A
    • 1981-08-11
    • US75044
    • 1979-09-12
    • Kenneth J. KountzRichard A. ErthDean K. Norbeck
    • Kenneth J. KountzRichard A. ErthDean K. Norbeck
    • H02P27/06F04B49/06F04D27/00F24F11/02F25B1/00F25B1/053F25B49/02
    • F25B49/022F25B49/025F25B2600/021Y02B30/741
    • The control system disclosed herein regulates a centrifugal compressor which has inlet guide vanes adjustable to vary the compressor capacity. A variable speed motor is connected to drive the compressor, and variation of this motor speed provides another input for regulating the compressor capacity. A control system achieves optimum energy efficiency, while avoiding surge, by the manner in which the motor speed and the inlet guide vane positions are regulated. To do this, a control signal must be derived to indicate the compressor head value. This signal is achieved by providing two signals, one related to the absolute condenser pressure, and the second related to the absolute evaporator pressure. The control system operates on these two signals to provide a third signal which is a function of a ratio, in which the numerator is the difference between the condenser and evaporator pressures, and the denominator is the evaporator pressure. Alternative measurement and processing techniques are described. This signal affords a very good indication of the compressor head and thus achieves increased efficiency of system operation, with consequent energy conservation, especially at lighter loads and low heads.
    • 本文公开的控制系统调节离心式压缩机,其具有可调节的入口导向叶片以改变压缩机容量。 连接变速电动机来驱动压缩机,并且该电动机速度的变化提供用于调节压缩机容量的另一个输入。 控制系统通过电动机速度和入口导向叶片位置的调节方式实现最佳的能量效率,同时避免浪涌。 为此,必须导出控制信号以指示压缩机机头值。 该信号通过提供两个信号来实现,一个与绝对冷凝器压力相关,另一个与绝对蒸发器压力相关。 控制系统对这两个信号进行操作,以提供第三个信号,它是一个比例的函数,其中分子是冷凝器和蒸发器压力之差,分母是蒸发器压力。 描述了替代测量和处理技术。 该信号提供了压缩机头的非常好的指示,从而实现了系统操作的更高的效率,从而节约了能量,特别是在较轻的负载和低的头部。
    • 6. 发明授权
    • Adjustable surge and capacity control system
    • 可调浪涌和容量控制系统
    • US4355948A
    • 1982-10-26
    • US235266
    • 1981-02-17
    • Kenneth J. KountzDean K. Norbeck
    • Kenneth J. KountzDean K. Norbeck
    • F04D27/02F01D17/02
    • F04D27/02F04D27/0246
    • An adjustable surge and capacity control system for matching a capacity control system to an inverter-driven centrifugal compressor based liquid chiller having unknown surge characteristics. The necessary adaptation of the capacity control circuit to a particular chiller is attained by the provision of two potentiometers which are adjustable to develop a functional which avoids surge and operates the system in an efficient manner at all feasible operating point loads and heads. The use of a circuit employing a pair of potentiometers permits the formation of the appropriate functional with two degrees of shaping flexibility.
    • 一种可调节的浪涌和容量控制系统,用于将容量控制系统与具有未知浪涌特性的变频器驱动的离心式压缩机基液体冷却器相匹配。 容量控制电路对特定冷却器的必要调整是通过提供两个电位计来实现的,这两个电位计是可调节的,以开发避免浪涌的功能,并且在所有可行的工作点负载和磁头上以有效的方式操作系统。 使用采用一对电位器的电路允许形成具有两度成形灵活性的适当的功能。
    • 9. 发明授权
    • Capacity control systems for inverter-driven centrifugal compressor
based water chillers
    • 基于变频驱动离心压缩机的冷水机组容量控制系统
    • US4546618A
    • 1985-10-15
    • US652401
    • 1984-09-20
    • Kenneth J. KountzRichard A. Erth
    • Kenneth J. KountzRichard A. Erth
    • F04D27/00F04D27/02F25B1/00F25B1/053F25B49/02F04B49/00
    • F25B49/02F25B1/053F25B2600/021Y02B30/741
    • A capacity control system for a refrigeration system including a compressor, a condensor, and an evaporator, all connected in a closed refrigeration circuit is provided. The compressor includes a plurality of adjustable inlet guide vanes, a motor connected to regulate the inlet guide vanes position, and an electrical speed motor connected to drive the compressor. The capacity control system includes a microprocessor responsive to continual measurements of a PRV signal, a compressor head signal and a suction flow signal for calculating a current operating point. The microprocessor determines whether the operating point is sufficiently away from a surge surface. The microprocessor will cause the operating point to move to a new operating point of a lower compressor speed and a more open PRV position if the operating point is sufficiently away from surge. In order to accomplish this, the microprocessor generates control signals to adjust both the speed of the compressor drive motor and the position of the inlet guide vanes. In an alternate embodiment, the microprocessor is responsive to continual measurements of a PRV signal, a motor speed signal, and a suction flow signal for generating such control signals.
    • 提供一种全封闭制冷回路连接的包括压缩机,冷凝器和蒸发器的制冷系统的容量控制系统。 压缩机包括多个可调节的入口引导叶片,连接以调节入口导向叶片位置的马达以及连接以驱动压缩机的电动马达。 容量控制系统包括响应于PRV信号的连续测量的微处理器,压缩机头信号和用于计算当前工作点的吸入流信号。 微处理器确定工作点是否足够远离浪涌表面。 如果工作点远离浪涌,微处理器将使工作点移动到较低压缩机转速和更开放的PRV位置的新工作点。 为了实现这一点,微处理器产生控制信号以调节压缩机驱动马达的速度和入口导叶的位置。 在替代实施例中,微处理器响应于PRV信号的连续测量,电动机速度信号和用于产生这种控制信号的吸入流信号。