-
公开(公告)号：US4960059A
公开(公告)日：1990-10-02
申请号：US371059
申请日：1989-06-26
IPC分类号： F23D17/00
CPC分类号： F23D17/00
摘要： A method is disclosed which overcomes the problems which tend to occur in the retrofitting of coal burners for low-NOx emission. A gaseous or volatile liquid fuel is introduced into the primary or secondary air with the amount ranging from 2% to 25% of the boiler energy input as necessary to achieve the necessary NOx reduction and improved load following without operational problems. Optionally gas can be injected through gas burners in an amount ranging from 2% to 50% of the boiler energy input.
摘要翻译： 公开了一种克服了在用于低NOx排放的燃煤机改造中倾向于发生的问题的方法。 将气态或挥发性液体燃料引入到一次或二次空气中，其量为锅炉能量输入的2％至25％，以在没有操作问题的情况下实现必要的NOx还原和改进的负载。 任选地，气体可以通过气体燃烧器注入量为锅炉能量输入的2％至50％。
-
公开(公告)号：US4779545A
公开(公告)日：1988-10-25
申请号：US159677
申请日：1988-02-24
CPC分类号： F23C6/00 , F23C1/12 , F23J2219/201
摘要： An apparatus and method for reducing nitrogen oxide emissions from furnace flue gas is provided in which a pulse generator introduces natural gas, or other fluid fuel which has little or no fixed nitrogen, into the upper portion of the furnace. The fuel pulse reacts with the nitrogen oxide in the flue gas to form ammonia-like compounds and nitrogen gas. These ammonia-like compounds react with additional amounts of nitrogen oxide in the flue gas to form nitrogen gas, water vapor and carbon dioxide. In this manner, the amount of nitrogen oxide in the flue gas is reduced using a process which can be easily applied to retrofitted furnaces.
摘要翻译： 提供了一种用于减少炉烟气中的氮氧化物排放的装置和方法，其中脉冲发生器将天然气或具有很少或没有固定氮的其它流体燃料引入炉的上部。 燃料脉冲与烟气中的氮氧化物反应形成氨类化合物和氮气。 这些氨类化合物与烟道气中的额外量的氮氧化物反应，形成氮气，水蒸汽和二氧化碳。 以这种方式，使用可以容易地应用于改装的炉子的方法来减少烟道气中的氮氧化物的量。
-
13.发明授权公开(公告)号：US06357367B1
公开(公告)日：2002-03-19
申请号：US09618782
申请日：2000-07-18
IPC分类号： F23J1100
CPC分类号： F23J15/003 , F23C2900/01001 , F23J2215/101
摘要： In an improved method for reducing nitrogen oxide emissions from a furnace wherein at least one injector is attached to the furnace above the primary combustion zone a biomass or biowaste and water slurry is injected into the flue gas through the injectors. The biowaste or a biomass material can be supplemented with a fixed nitrogen source.
摘要翻译： 在用于减少来自炉的氮氧化物排放的改进方法中，其中至少一个喷射器连接到主燃烧区上方的炉，生物质或生物废水和水浆通过喷射器注入烟道气中。 生物废物或生物质材料可以用固定氮源补充。
-
公开(公告)号：US5568777A
公开(公告)日：1996-10-29
申请号：US359800
申请日：1994-12-20
CPC分类号： F23D1/00 , F23D2201/10 , F23D2201/20
摘要： An improved pulverized coal burner that reduces the formation of nitrogen oxides. The coal burner includes fuel splitters that separate a mixture of primary air and coal into a plurality of streams while the mixture is discharged through a diffuser having a plurality of partially open areas and a plurality of blocked areas. After passing through the diffuser, the plurality of streams are discharged into a furnace to be burned. The plurality of partially open areas and blocked areas are created by removing sections of the diffuser and replacing the removed sections with fuel splitters. Creation of these discrete streams delays mixing with secondary air. Because primary air is supplied in sub-stoichiometric quantities, the coal in these split streams will be burned under fuel-rich conditions for the first 100 to 200 milliseconds of combustion, until the delayed mixing of secondary air occurs. Combustion in a fuel-rich environment retards formation of nitrogen oxides in two ways. First, nitrogen that is part of the volatile matter that is evolved during the early stages of combustion will tend to form molecular nitrogen rather than react with oxygen to form nitrogen oxides. Second, an oxygen deficiency will reduce formation of nitrogen oxides from atmospheric nitrogen.
摘要翻译： 一种改进的粉煤燃烧器，可减少氮氧化物的形成。 煤燃烧器包括燃料分配器，其将一次空气和煤的混合物分离成多个流，同时通过具有多个部分开放区域和多个阻塞区域的扩散器排出混合物。 在通过扩散器之后，将多个流排出到待燃烧的炉中。 通过去除扩散器的部分并且用燃料分离器代替去除的部分来产生多个部分开放区域和阻塞区域。 这些离散流的创建延迟了与二次空气的混合。 由于一次空气以亚化学计量的方式供应，这些分流中的煤将在富燃料条件下燃烧第一个100至200毫秒的燃烧，直到发生二次空气的延迟混合。 在富含燃料的环境中的燃烧有两种方式阻碍了氮氧化物的形成。 首先，作为在燃烧的早期阶段演化的挥发性物质的一部分的氮将倾向于形成分子氮而不是与氧反应形成氮氧化物。 第二，缺氧会减少氮氧化物从大气氮的形成。
-
公开(公告)号：US5546874A
公开(公告)日：1996-08-20
申请号：US362290
申请日：1994-12-22
申请人： Bernard P. Breen , John P. Bionda, Jr. , James E. Gabrielson , Roger W. Glickert , Anthony Hallo
发明人： Bernard P. Breen , John P. Bionda, Jr. , James E. Gabrielson , Roger W. Glickert , Anthony Hallo
CPC分类号： F23C5/00 , F23C2201/102 , F23C2900/05081
摘要： A method and apparatus for reducing the formation of nitrogen oxides during combustion in a roof-fired furnace is disclosed. By blocking at least some of the fuel nozzles associated with a roof-fired burner while leaving open the secondary air openings associated with the blocked fuel nozzles, reduction in NOX emissions from roof-fired furnaces is accomplished. This blocking results in the creation of a localized fuel-rich or just slightly fuel-lean environment near open fuel nozzles because part of the secondary air needed for combustion is being added at a location distant from where the initial combustion occurs. By creating a localized fuel-rich or slightly fuel-lean environment near the open fuel nozzles, the initial stages of combustion occur with little or no excess oxygen present. Because much of the fuel-bound nitrogen is liberated during the initial stages of combustion, it will preferentially react to form molecular nitrogen rather than nitrogen oxides because of the lack of available oxygen. Further, by the time all the secondary air is mixed with the pulverized coal to complete substantially the combustion, the flame temperature will have been sufficiently lowered by heat transfer to the boiler tubes that thermal formation of nitrogen oxides will be reduced. This invention works well in those roof-fired furnaces where individual burners are composed of multiple fuel nozzles and the fuel nozzles eject primary air and fuel between boiler tubes which form the furnace roof.
摘要翻译： 公开了一种用于在屋顶燃烧炉中燃烧期间减少氮氧化物形成的方法和装置。 通过阻挡与屋顶燃烧的燃烧器相关联的至少一些燃料喷嘴，同时打开与堵塞的燃料喷嘴相关联的二次空气开口，从而实现了屋顶燃烧炉的NO x排放的减少。 这种阻塞导致在打开的燃料喷嘴附近产生局部富燃料或仅略微贫燃环境，因为燃烧所需的二次空气的一部分被添加在远离初始燃烧发生的位置。 通过在敞开的燃料喷嘴附近产生局部的富含燃料或稍微贫燃的环境，燃烧的初始阶段几乎没有或没有过量的氧存在。 由于大部分燃料结合的氮在燃烧的初始阶段被释放，由于缺乏可用的氧，它将优先反应形成分子氮而不是氮氧化物。 此外，当所有的二次空气与粉煤混合以完全燃烧时，通过传递到锅炉管的火焰温度将被充分降低，氮氧化物的热形成将被减少。 本发明在那些屋顶燃烧炉中工作良好，其中单个燃烧器由多个燃料喷嘴组成，并且燃料喷嘴在形成炉顶的锅炉管之间喷射一次空气和燃料。
-
16.发明授权Apparatus and method of lowering NO.sub.x emissions using diffusion processes 失效使用扩散过程降低NOx排放的装置和方法
公开(公告)号：US5078064A
公开(公告)日：1992-01-07
申请号：US623782
申请日：1990-12-07
IPC分类号： F23C1/12
CPC分类号： F23C1/12 , Y02E20/344
摘要： An apparatus and method for reducing nitrogen oxide emissions from furnace flue gas is provided in which natural gas or other fluid fuel which has little or no fixed nitrogen is introduced into the upper portion of the furnace. The fuel diffuses by laminar or turbulent diffusion into oxygen-rich flue gas where it reacts with oxygen and nitric oxide to form CO.sub.2, H.sub.2 O and N.sub.2, thus reducing the nitrogen oxide emissions from the furnace. In this manner, the amount of nitrogen oxide in the flue gas is reduced. The apparatus and method can be easily applied to new furnaces or retrofitted on existing furnaces.
摘要翻译： 提供了一种用于减少炉烟气中的氮氧化物排放的装置和方法，其中将天然气或具有很少或不固定氮的其它流体燃料引入炉的上部。 燃料通过层流或湍流扩散扩散到富氧烟气中，与氧气和一氧化氮反应形成CO2，H2O和N2，从而减少了炉内的氮氧化物排放。 以这种方式，烟气中的氮氧化物的量减少。 该设备和方法可以方便地应用于新的炉子或在现有的炉子上进行改造。
-
公开(公告)号：US06478948B2
公开(公告)日：2002-11-12
申请号：US09793792
申请日：2001-02-26
IPC分类号： C23F1300
CPC分类号： G01N17/02 , F23G5/48 , F23M5/08 , F23M2900/05001
摘要： A method for monitoring and reducing corrosion in furnace boiler tubes measures electrochemical noise associated with corrosion mechanisms while corrosion is occurring at the surface of the tubes as they are exposed to combustion products. This noise is detected using a probe at the boiler waterwall surface that is connected to a corrosion monitor. The monitor contains a computer and software which determines a corrosion rate from the measured electrochemical noise. That rate is compared to a standard to determine if the rate is within acceptable limits. If not, the operator of the furnace or an Adaptive Process Controller (APC) is notified and adjusts one or more burners to change the combustion products that are responsible for the corrosion. Such an adjustment could be made by changing the amount of air or fuel being provided to the burner or other air slots or air ports. After that adjustment is made the furnace emissions could be checked for NOx, SOx and particulate emissions and further adjustments could be made to the burners to reduce those emissions.
-
18.发明授权Apparatus and method for NO.sub.x reduction by selective injection of natural gas jets in flue gas 失效通过在烟道气中选择性地喷射天然气射流来减少NOx的装置和方法
公开(公告)号：US5915310A
公开(公告)日：1999-06-29
申请号：US507928
申请日：1995-07-27
CPC分类号： F23C6/047 , F23C2202/20 , F23J2215/10 , F23L2900/07009
摘要： A method of reducing NO.sub.x determines an NO.sub.x concentration profile within a zone of the furnace which is at a temperature below 2600.degree. F. A stream of fluid fuel is injected into at least one region of relatively high NO.sub.x concentration so that the fluid fuel mixes therein with the flue gas. The fluid fuel is natural gas, hydrogen, C.sub.x H.sub.y compounds, C.sub.x H.sub.y O.sub.z compounds or mixtures primarily of those compounds, in sufficient quantity to promote a reaction between nitrogen oxide in the flue gas and the fluid fuel, so as to substantially reduce nitrogen oxide content of the flue gas. The injector through which the fluid fuel is injected can be moveable and may have valves or deflectors to aid in directing the fluid fuel to regions of relatively high NO.sub.x concentration.
摘要翻译： 一种还原NOx的方法决定了炉内温度低于2600°F的区域内的NOx浓度分布。流体燃料流注入至少一个具有较高NOx浓度的区域，以使流体燃料在其中混合 与烟气。 流体燃料是天然气，氢，C x H y化合物，C x H y O z化合物或主要由那些化合物混合的物质，其量足以促进烟气中的氮氧化物与流体燃料之间的反应，以便基本上减少 烟气 注入流体燃料的喷射器可以是可移动的并且可以具有阀或偏转器，以帮助将流体燃料引导到具有较高NOx浓度的区域。
-
19.发明授权Apparatus and process for control of nitric oxide emissions from combustion devices using vortex rings and the like 失效用于控制使用涡环等的燃烧装置的一氧化氮排放的装置和方法
公开(公告)号：US5181475A
公开(公告)日：1993-01-26
申请号：US829430
申请日：1992-02-03
CPC分类号： F23C6/047 , F23C1/00 , F23C2201/101 , F23C2201/301
摘要： An apparatus and method for reducing nitrogen oxide emissions from the products of combustion is provided in which a vortex generator introduces natural gas, or other fluid fuel into the upper portion of a combustion device. The fuel introduced forms vortices, such as vortex rings, and the fuel reacts with the nitrogen oxide in the combustion products to form ammonia-like compounds, hydrogen cyanide and similar compounds, and nitrogen. The ammonia and cyanide-like fragments react with additional amounts of nitrogen oxide in the combustion products to form nitrogen gas, water vapor and carbon dioxide. The vortex rings can be controlled and will maintain their integrity longer than puffs or simple jets of fuel.
摘要翻译： 提供一种用于减少来自燃烧产物的氮氧化物排放的装置和方法，其中涡流发生器将天然气或其它流体燃料引入燃烧装置的上部。 引入的燃料形成漩涡，例如涡环，燃料与燃烧产物中的氮氧化物反应形成氨类化合物，氰化氢和类似化合物以及氮气。 氨和氰化物样碎片与燃烧产物中的额外量的氮氧化物反应以形成氮气，水蒸气和二氧化碳。 涡流环可以被控制，并且将保持它们的完整性比抽吸或简单的燃料喷射更长。
-
公开(公告)号：US5141726A
公开(公告)日：1992-08-25
申请号：US608989
申请日：1990-11-05
IPC分类号： B01D53/56
CPC分类号： B01D53/56
摘要： Nitrogen oxide and dioxide content of flue gas from combustion devices is reduced by mixing combustion air and a gas or volatilized fuel in proportions below the lower combustible limit of the mixture and utilizing that mixture for at least a part of the combustion air supplied to the devices. The mixture may take the form of air contaminated with a fuel.
摘要翻译： 通过将燃烧空气和气体或挥发性燃料以低于混合物的较低可燃极限的比例混合来混合来减少来自燃烧装置的烟道气的氮氧化物和二氧化物含量，并且将该混合物用于供应给装置的至少一部分燃烧空气 。 混合物可能采取被燃料污染的空气的形式。
-
-
-
-
-
-
-
-
-
搜索结果
26 条记录 (耗时 0.014 秒)
