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257 条记录 (耗时 0.024 秒)

    Elevated pressure air separation cycles with liquid production
    94.
    发明授权
    Elevated pressure air separation cycles with liquid production 失效
    高压空气分离循环与液体生产

    公开(公告)号：US5165245A

    公开(公告)日：1992-11-24

    申请号：US700021

    申请日：1991-05-14

    申请人： Rakesh Agrawal ,  Jianguo Xu

    发明人： Rakesh Agrawal ,  Jianguo Xu

    IPC分类号： F25J3/04

    CPC分类号： F25J3/04181 ,  F25J3/04284 ,  F25J3/04296 ,  F25J3/04315 ,  F25J3/04393 ,  F25J3/04412 ,  F25J3/04672 ,  F25J3/04733 ,  F25J2200/20 ,  F25J2200/54 ,  F25J2205/02 ,  F25J2205/60 ,  F25J2250/20 ,  Y10S62/939

    摘要： The present invention relates to an improvement to a cryogenic process for the separation of air into its constituent components. In the process, a distillation column system having at least two distillation columns, a high pressure distillation column and a low pressure column is used; these two distillation columns are in thermal communication with each other. The low pressure column of the distillation column system operates at a pressure between 9 to 75 psig and a nitrogen product is produced from the top section thereof. At least 50% of the air to the distillation column system is removed as this nitrogen product, which has a nitrogen concentration of at least 95% and is at a pressure of at least 9 psig.The improvement to the process is a series of steps which allows for the production of liquid products from the cryogenic process in an efficient manner. These steps are primarily the partial warming of the nitrogen product, its subsequent isentropic expansion and use of the inherent refrigeration of the expanded nitrogen. These steps can be carried out in three ways.

    Use of liquefied natural gas (LNG) coupled with a cold expander to produce liquid nitrogen
    95.
    发明授权
    Use of liquefied natural gas (LNG) coupled with a cold expander to produce liquid nitrogen 失效
    使用与冷膨胀器相连的液化天然气（LNG）产生液氮

    公开(公告)号：US5141543A

    公开(公告)日：1992-08-25

    申请号：US691773

    申请日：1991-04-26

    申请人： Rakesh Agrawal ,  Thomas E. Cormier, Sr.

    发明人： Rakesh Agrawal ,  Thomas E. Cormier, Sr.

    IPC分类号： F25J3/04 ,  F17C9/04 ,  F25J1/02

    CPC分类号： F25J3/04351 ,  F17C9/04 ,  F25J1/0015 ,  F25J1/0037 ,  F25J1/004 ,  F25J1/0042 ,  F25J1/0224 ,  F25J1/0234 ,  F25J1/0292 ,  F25J3/0406 ,  F25J3/0409 ,  F25J3/04224 ,  F25J3/04266 ,  F25J3/04387 ,  F17C2221/033 ,  F17C2223/0161 ,  F17C2223/033 ,  F17C2225/0123 ,  F17C2227/0309 ,  F17C2265/05 ,  F25J2210/50 ,  F25J2210/62 ,  F25J2230/08 ,  F25J2230/42 ,  F25J2240/12 ,  F25J2245/42 ,  F25J2245/90

    摘要： The present invention relates to a process for the liquefaction of a nitrogen stream produced by separating air components, by using the combination of cryogenic distillation with improved refrigeration. Very cold liquefied natural gas (LNG) is employed as refrigerant, with the LNG currently being revaporized for transportation.Multi-stage component compression is used, with the component feed to each compression stage being precooled using sequential refrigeration from the LNG. Expander means for the coldest air component product stream provides supplemental refrigeration at the cold end beyond that which is available from the refrigerant LNG.In a preferred embodiment, the feed nitrogen stream(s) are compressed to at least 300 psi in a multi-stage compressor with interstage cooling provided by heat exchange against vaporizing LNG; the resulting compressed stream is directed into first and second nitrogen substreams, followed by further cooling of the first substream by heat exchange against vaporizing LNG and then expanding the cooled first substream to produce an expanded nitrogen substream. Condensing of the second compressed substream against both vaporizing LNG and the expanded nitrogen substream is carried out. Reducing the pressure of the condensed second nitrogen substream produces a two phase nitrogen stream. Phase separation yields a recyclable nitrogen vapor stream and a liquid nitrogen stream as product.

    摘要翻译： 本发明涉及通过使用低温蒸馏与改进的制冷的组合分离空气组分而产生的氮气流的液化方法。 使用非常冷的液化天然气（LNG）作为制冷剂，目前LNG正在进行再蒸发运输。 使用多级部件压缩，使用来自LNG的顺序制冷将每个压缩级的分量进料预冷却。 用于最冷空气组分产物流的膨胀器意味着在冷端超过可从制冷剂LNG获得的冷却的补充制冷。 在一个优选的实施方案中，在多级压缩机中将进料氮气流压缩至至少300psi，其中通过与蒸发的LNG进行热交换而提供级间冷却; 将所得压缩流引导到第一和第二氮气流中，随后通过与汽化LNG的热交换进一步冷却第一子流，然后使冷却的第一子流扩展以产生膨胀的氮气流。 执行第二压缩子流对蒸发LNG和膨胀氮气流的冷凝。 减少浓缩的第二氮气流的压力产生两相氮气流。 相分离产生可回收的氮蒸汽流和液氮流作为产物。

    Cryogenic process for the production of methane-free, krypton/xenon product
    96.
    发明授权
    Cryogenic process for the production of methane-free, krypton/xenon product 失效
    用于生产无甲烷，氪/氙产品的低温工艺

    公开(公告)号：US5063746A

    公开(公告)日：1991-11-12

    申请号：US650523

    申请日：1991-02-05

    申请人： Rakesh Agrawal ,  Brian E. Farrell

    发明人： Rakesh Agrawal ,  Brian E. Farrell

    IPC分类号： C01B23/00 ,  F25J3/04

    CPC分类号： F25J3/04412 ,  F25J3/04678 ,  F25J3/04745 ,  F25J2200/32 ,  F25J2200/34 ,  F25J2205/30 ,  F25J2205/60 ,  Y10S62/925

    摘要： The present invention relates to a process for the production of kryton and xenon by using a vapor stream containing greater than 2% oxygen to strip a liquid stream containing oxygen, krypton, methane and xenon of methane. This is accomplished by properly adjusting the liquid to vapor flows in the distillation column. The use of a suitable reflux liquid will decrease the loss of krypton and xenon in the methane laden vapor stream leaving the distillation system.

    摘要翻译： 本发明涉及通过使用含有大于2％氧的蒸气流来生产含有氧，氪，甲烷和甲烷氙的液体流来生产氪和氙的方法。 这是通过在蒸馏塔中适当地调节液体与蒸汽流量来实现的。 使用合适的回流液将减少离开蒸馏系统的含甲烷蒸气流中氪和氙的损失。

    Orientation of photovoltaic modules to minimize intercepted radiation in photovoltaic aglectric systems
    98.
    发明授权
    Orientation of photovoltaic modules to minimize intercepted radiation in photovoltaic aglectric systems 有权

    公开(公告)号：US11646693B2

    公开(公告)日：2023-05-09

    申请号：US16997386

    申请日：2020-08-19

    申请人： Rakesh Agrawal ,  Peter Andrew Bermel ,  Allison Perna

    发明人： Rakesh Agrawal ,  Peter Andrew Bermel ,  Allison Perna

    IPC分类号： H02S20/32

    CPC分类号： H02S20/32

    摘要： A photovoltaic system for generating electrical power on farmland while minimizing reduction of solar radiation incident on ground due to shadowing, including a photovoltaic module having a first photovoltaic face defining a first plane, a normal axis extending from the first plane, a first pivot axis extending through the photovoltaic module, a second pivot axis extending through the photovoltaic module, at least one motor operationally connected to pivot the photovoltaic module about at least one pivot axis, and an electronic controller operationally connected to at least one motor. An incident solar ray strikes the photovoltaic module at an angle of incidence defined as an intersection of the incident solar ray and the normal axis. The electronic controller sends signals to the at least one motor to maintain the angle of incidence as close as possible to ninety degrees.

    Customized search
    99.
    发明授权
    Customized search 有权
    定制搜索

    公开(公告)号：US09262525B2

    公开(公告)日：2016-02-16

    申请号：US12253658

    申请日：2008-10-17

    申请人： John C. Shafer ,  Rakesh Agrawal

    发明人： John C. Shafer ,  Rakesh Agrawal

    IPC分类号： G06F17/30

    CPC分类号： G06F17/30864 ,  G06F17/30477

    摘要： Techniques are disclosed herein for providing a custom search engine. In one aspect, a first search query is received from a requestor. First search results contain search result items that match the first search query are obtained. A least one sub-query is generated from the first search results. The generating is based on rules for a particular custom search engine. Second search results that match the sub-query are then obtained. A search result set is formed from a corpus that includes the first search results and the second search results. The generating of the search result set is based on the rules for the particular custom search engine. The search result set is provided to the requester. In one aspect an interface for designing a custom search engine is provided. The interface allows the designer to specify the layout of a search results page.

    摘要翻译： 本文公开了用于提供定制搜索引擎的技术。 在一个方面，从请求者接收第一搜索查询。 首先搜索结果包含与第一个搜索查询匹配的搜索结果项。 从第一搜索结果生成至少一个子查询。 生成基于特定自定义搜索引擎的规则。 然后获得与子查询匹配的第二搜索结果。 搜索结果集由包含第一搜索结果和第二搜索结果的语料库形成。 搜索结果集的生成基于特定自定义搜索引擎的规则。 搜索结果集提供给请求者。 在一个方面，提供了一种用于设计定制搜索引擎的界面。 该界面允许设计者指定搜索结果页面的布局。