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公开(公告)号：US08848192B2
公开(公告)日：2014-09-30
申请号：US13890623
申请日：2013-05-09
申请人： Fuel Tech, Inc.
CPC分类号： G01N21/61 , G01N1/00 , G01N1/2247 , G01N1/26 , G01N21/3504 , G01N21/39 , G01N33/0054 , Y02A50/246
摘要： Disclosed are methods and apparatus for treating and analyzing a gas stream to determine the ammonia concentration. A gas stream is continuously monitored to determine the ammonia concentration by extracting gas samples from one or more locations and sending it to a tunable diode laser absorption spectroscopy instrument for analysis. By proper placement of sampling probes within a duct, depending on the particular flow patterns that have been determined by suitable modeling, e.g., computational fluid dynamics or cold flow modeling, the valves can be operated manually or by a controller to take samples at predetermined locations within the duct. This will enable taking samples from particular locations, samples representative of the entire cross section, or samples that are an average of a particular cross section. It will be possible by judicious placement of the probes and operation of the valves to map the concentrations of ammonia at a plurality of load settings and will permit continuous control.
摘要翻译： 公开了用于处理和分析气流以确定氨浓度的方法和装置。 通过从一个或多个位置提取气体样品并将其发送到可调谐二极管激光吸收光谱仪进行分析，连续监测气流以确定氨浓度。 通过将采样探针正确放置在管道内，取决于通过适当建模（例如计算流体动力学或冷流建模）确定的特定流动模式，阀可以手动操作或通过控制器在预定位置进行采样 在管道内。 这将使得能够从特定位置获取样本，代表整个横截面的样本，或者是特定横截面的平均值的样本。 可以通过明智地放置探针和操作阀来在多个负载设置下对氨的浓度进行映射并且将允许连续控制。
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公开(公告)号：US11339056B2
公开(公告)日：2022-05-24
申请号：US15856802
申请日：2017-12-28
申请人： Fuel Tech, Inc.
摘要： Disclosed are methods and compact apparatus for controlled, on-demand ammonia generation from urea. The process gasifies an aqueous urea solution in a chamber utilizing hot gas while controlling the flows of aqueous urea solution and hot gas to achieve complete gasification of the aqueous urea solution and form a gas mixture comprising ammonia, isocyanic acid, carbon dioxide and water vapor, which is passed through a catalyst bed containing particulate transition metal oxide to convert substantially all of the isocyanic acid to ammonia. A catalyst support and the catalyst bed are aligned with the gasification chamber at the lower end of said chamber to provide a degree of back pressure on the gases in the gasification chamber to isolate the gasification chamber from turbulent exit effects caused by equipment downstream of the thermal reactor. A sample of the product stream is treated to remove water and ammonia, and analyze for carbon dioxide content to control the process. The apparatus to perform the process includes flow managing equipment and catalyst supports that facilitate continuous operation with accurate control.
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公开(公告)号：US20180194639A1
公开(公告)日：2018-07-12
申请号：US15856802
申请日：2017-12-28
申请人： Fuel Tech, Inc.
CPC分类号： C01C1/086 , B01D53/9409 , B01J8/025 , B01J8/0278 , B01J19/245 , B01J21/063 , B01J2208/00548 , B01J2208/00884 , B01J2219/00164 , B01J2219/24 , C01C1/08
摘要： Disclosed are methods and compact apparatus for controlled, on-demand ammonia generation from urea. The process gasifies an aqueous urea solution in a chamber utilizing hot gas while controlling the flows of aqueous urea solution and hot gas to achieve complete gasification of the aqueous urea solution and form a gas mixture comprising ammonia, isocyanic acid, carbon dioxide and water vapor, which is passed through a catalyst bed containing particulate transition metal oxide to convert substantially all of the isocyanic acid to ammonia. A catalyst support and the catalyst bed are aligned with the gasification chamber at the lower end of said chamber to provide a degree of back pressure on the gases in the gasification chamber to isolate the gasification chamber from turbulent exit effects caused by equipment downstream of the thermal reactor. A sample of the product stream is treated to remove water and ammonia, and analyze for carbon dioxide content to control the process. The apparatus to perform the process includes flow managing equipment and catalyst supports that facilitate continuous operation with accurate control.
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公开(公告)号：US20130301053A1
公开(公告)日：2013-11-14
申请号：US13890623
申请日：2013-05-09
申请人： FUEL TECH, INC.
IPC分类号： G01N21/61
CPC分类号： G01N21/61 , G01N1/00 , G01N1/2247 , G01N1/26 , G01N21/3504 , G01N21/39 , G01N33/0054 , Y02A50/246
摘要： Disclosed are methods and apparatus for treating and analyzing a gas stream to determine the ammonia concentration. A gas stream is continuously monitored to determine the ammonia concentration by extracting gas samples from one or more locations and sending it to a tunable diode laser absorption spectroscopy instrument for analysis. By proper placement of sampling probes within a duct, depending on the particular flow patterns that have been determined by suitable modeling, e.g., computational fluid dynamics or cold flow modeling, the valves can be operated manually or by a controller to take samples at predetermined locations within the duct. This will enable taking samples from particular locations, samples representative of the entire cross section, or samples that are an average of a particular cross section. It will be possible by judicious placement of the probes and operation of the valves to map the concentrations of ammonia at a plurality of load settings and will permit continuous control.
摘要翻译： 公开了用于处理和分析气流以确定氨浓度的方法和装置。 通过从一个或多个位置提取气体样品并将其发送到可调谐二极管激光吸收光谱仪进行分析，连续监测气流以确定氨浓度。 通过将采样探针正确放置在管道内，取决于通过适当建模（例如计算流体动力学或冷流建模）确定的特定流动模式，阀可以手动操作或通过控制器在预定位置进行采样 在管道内。 这将使得能够从特定位置获取样本，代表整个横截面的样本，或者是特定横截面的平均值的样本。 可以通过明智地放置探针和操作阀来在多个负载设置下对氨的浓度进行映射并且将允许连续控制。
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