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    Detecting liquid dry conditions for liquefied compressed gases
    2.
    发明授权
    Detecting liquid dry conditions for liquefied compressed gases 有权
    检测液化气体的液体干燥条件

    公开(公告)号：US06742282B2

    公开(公告)日：2004-06-01

    申请号：US10300477

    申请日：2002-11-20

    Applicant: Naser Mahmud Chowdhury ,  Sukla Chandra ,  Warren Matthew Janigian

    Inventor： Naser Mahmud Chowdhury ,  Sukla Chandra ,  Warren Matthew Janigian

    IPC: F26B504

    CPC classification number: F17C7/02 ,  F17C13/02 ,  F17C13/025 ,  F17C13/026 ,  F17C2221/012 ,  F17C2221/03 ,  F17C2221/037 ,  F17C2221/05 ,  F17C2223/0153 ,  F17C2223/035 ,  F17C2250/032 ,  F17C2250/036 ,  F17C2250/043 ,  F17C2250/0439 ,  F17C2250/0473 ,  F17C2250/0491 ,  F17C2250/0495 ,  F17C2270/0518 ,  Y02E60/321

    Abstract: A method and an apparatus are disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The apparatus includes a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, said substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. The preferred embodiment includes a third sensor for sensing ambient temperature (Ta) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.

    Abstract translation: 公开了一种方法和装置，用于在含有液化压缩气体的容器中检测液体干燥状况的发生，同时液化压缩气体的气相随着时间从容器中移出。 该装置包括第一传感器，第二传感器和计算机，优选地是编程逻辑控制器（PLC）。 第一传感器感测容器内的温度（T），并提供指示其的信号。 第二传感器感测容器内的压力（P）并提供指示其的信号。 计算机接收来自第一和第二传感器的信号，并确定容器内的压力（dP / dt）和温度（dT / dt）随时间变化的速率。 计算机识别容器内的温度变化率（dT / dt）的突然增加的发生，以及容器内部的压力变化率（dP / dt）的显着同时出现 所述基本上同时发生的事件表明在容器中出现液体干燥状况。 优选实施例包括用于感测环境温度（Ta）并用于提供指示其的信号的第三传感器。 计算机接收来自第三传感器的信号，并且在确定容器内的温度变化率（dT / dt）随时间变化时，考虑到环境温度的变化。

    Detecting liquid dry conditions for liquified compressed gases
    3.
    发明授权
    Detecting liquid dry conditions for liquified compressed gases 失效
    检测液化干燥条件下的液化压缩气体

    公开(公告)号：US06643951B1

    公开(公告)日：2003-11-11

    申请号：US09694199

    申请日：2000-10-23

    Applicant: Naser Mahmud Chowdhury ,  Sukla Chandra ,  Warren Matthew Janigian

    Inventor： Naser Mahmud Chowdhury ,  Sukla Chandra ,  Warren Matthew Janigian

    IPC: F26B504

    CPC classification number: F17C7/02 ,  F17C13/02 ,  F17C13/025 ,  F17C13/026 ,  F17C2250/043 ,  F17C2250/0439 ,  F17C2250/046 ,  F17C2250/0473 ,  F17C2250/0495 ,  F17C2250/0694 ,  F17C2260/024 ,  F17C2270/0168 ,  F17C2270/0518

    Abstract: A method and an apparatus are disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The apparatus includes a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, said substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. The preferred embodiment includes a third sensor for sensing ambient temperature (Ta) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.

    Abstract translation: 公开了一种用于检测在含有液化压缩气体的容器中液体干燥状况的发生的方法和装置，同时液化压缩气体的气相随着时间从容器中移出。 该装置包括第一传感器，第二传感器和计算机，优选地是编程逻辑控制器（PLC）。 第一传感器感测容器内的温度（T），并提供指示其的信号。 第二传感器感测容器内的压力（P）并提供指示其的信号。 计算机接收来自第一和第二传感器的信号，并确定容器内的压力（dP / dt）和温度（dT / dt）随时间变化的速率。 计算机识别容器内的温度变化率（dT / dt）的突然增加的发生，以及容器内部的压力变化率（dP / dt）的显着同时出现 所述基本上同时发生的事件表明在容器中出现液体干燥状况。 优选实施例包括用于感测环境温度（Ta）并用于提供指示其的信号的第三传感器。 计算机接收来自第三传感器的信号，并且在确定容器内的温度变化率（dT / dt）随时间变化时，考虑到环境温度的变化。

    Detecting liquid dry conditions for liquefied compressed gases
    4.
    发明授权
    Detecting liquid dry conditions for liquefied compressed gases 失效
    检测液化气体的液体干燥条件

    公开(公告)号：US6134805A

    公开(公告)日：2000-10-24

    申请号：US138498

    申请日：1998-08-24

    Applicant: Naser Mahmud Chowdhury ,  Sukla Chandra ,  Warren Matthew Janigian

    Inventor： Naser Mahmud Chowdhury ,  Sukla Chandra ,  Warren Matthew Janigian

    IPC: F17C7/02 ,  F17C13/02 ,  F26B5/04

    CPC classification number: F17C7/02 ,  F17C13/02 ,  F17C13/025 ,  F17C13/026 ,  F17C2221/012 ,  F17C2221/03 ,  F17C2221/037 ,  F17C2221/05 ,  F17C2223/0153 ,  F17C2223/035 ,  F17C2250/032 ,  F17C2250/036 ,  F17C2250/043 ,  F17C2250/0439 ,  F17C2250/0473 ,  F17C2250/0491 ,  F17C2250/0495 ,  F17C2270/0518 ,  Y02E60/321

    Abstract: A method [and an apparatus are] is disclosed for detecting an occurrence of a liquid dry condition in a container containing a liquefied compressed gas while the gaseous phase of the liquefied compressed gas is being removed from the container over time. The [apparatus includes] method uses a first sensor, a second sensor, and a computer, preferably a programmed logic controller (PLC). The first sensor senses temperature (T) inside the container and provides a signal indicative thereof. The second sensor senses pressure (P) inside the container and provides a signal indicative thereof. The computer receives signals from the first and second sensors, and determines the rates of change in the pressure (dP/dt) and the temperature (dT/dt) inside the container over time. The computer identifies an occurrence of a sudden increase in the rate of change in the temperature (dT/dt) inside the container and a substantial simultaneous occurrence of a sudden decrease in the rate of change in the pressure (dP/dt) inside the container, [said] substantially simultaneous occurrences indicating an occurrence of a liquid dry condition in the container. [The preferred embodiment includes a third sensor for sensing ambient temperature (T.sub.a) and for providing a signal indicative thereof. The computer receives a signal from the third sensor and accounts for a change in the ambient temperature in determining the rate of change in the temperature (dT/dt) inside the container over time.]

    Abstract translation: 公开了一种用于检测在含有液化压缩气体的容器中液体干燥状况的发生同时液体压缩气体的气相随时间从容器中移出的方法[和装置]。 [装置包括]方法使用第一传感器，第二传感器和计算机，优选地是编程逻辑控制器（PLC）。 第一传感器感测容器内的温度（T），并提供指示其的信号。 第二传感器感测容器内的压力（P）并提供指示其的信号。 计算机接收来自第一和第二传感器的信号，并确定容器内的压力（dP / dt）和温度（dT / dt）随时间变化的速率。 计算机识别容器内的温度变化率（dT / dt）的突然增加的发生，以及容器内部的压力变化率（dP / dt）的显着同时出现 ，表示在容器中出现液体干燥状态的基本上同时发生的事件。 [优选实施例包括用于感测环境温度（Ta）并用于提供指示其的信号的第三传感器。 计算机接收来自第三传感器的信号，并且在确定容器内的温度变化率（dT / dt）随时间变化时，考虑到环境温度的变化。

    Ultra high purity delivery system for liquefied compressed gases
    6.
    发明授权
    Ultra high purity delivery system for liquefied compressed gases 失效
    用于液化压缩气体的超高纯度输送系统

    公开(公告)号：US5644921A

    公开(公告)日：1997-07-08

    申请号：US651311

    申请日：1996-05-22

    Applicant: Naser Mahmud Chowdhury

    Inventor： Naser Mahmud Chowdhury

    IPC: F17C9/02

    CPC classification number: F17C9/02 ,  F17C2201/0109 ,  F17C2201/035 ,  F17C2201/054 ,  F17C2201/056 ,  F17C2205/018 ,  F17C2205/0332 ,  F17C2205/0335 ,  F17C2221/05 ,  F17C2223/0153 ,  F17C2227/0304 ,  F17C2227/0374 ,  F17C2250/0626 ,  F17C2260/021 ,  F17C2270/0518

    Abstract: A method and apparatus for storing ultra high purity non-cryogenic liquefied compressed gases, such as ammonia (NH.sub.3), and delivering a vaporized gaseous product from those liquefied gases for semiconductor processing applications. The delivery method includes withdrawing and heating gaseous product from a storage vessel containing the liquefied compressed gas, and then piping the heated gas through the liquid contained in the storage vessel in a heat exchange fashion. The heat exchange with the liquid inside the vessel induces boiling to maintain a vaporized gaseous product under a minimum positive pressure in said vessel. After liberating its heat, the gaseous product is delivered to a semiconductor manufacturing point of use.

    Abstract translation: 用于储存例如氨（NH 3）的超高纯度非低温液化压缩气体的方法和装置，并从用于半导体处理应用的那些液化气体输送蒸发的气体产物。 输送方法包括从含有液化压缩气体的储存容器中取出和加热气态产物，然后以热交换的方式将加热的气体通过储存容器中所含的液体进行配管。 与容器内部的液体的热交换引起沸腾以在所述容器中保持在最小正压下的蒸发的气态产物。 释放出热量后，气态产物被输送到半导体制造使用点。

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