壳牌低温脱硝、二恶英及氧化亚氮消除技术系统介绍

壳牌低温脱硝、二恶英及氧化亚氮消除技术系统介绍2010-01-30 23:30:09| 分类：活性炭技术| 标签：|字号大中小订阅壳牌低温脱硝、二恶英及氧化亚氮消除技术系统介绍该技术系统是由英荷壳牌集团的成员之一，CRI（Catalyst Regeneration International）国际公司下属的全资子公司CRI催化剂公司开发的。

CRI的总部设在美国休斯顿。

1998年营业额5亿美元，主要从事炼油、石油化工和化工催化剂生产、销售和技术服务业务。

CRI催化剂公司（CRI Catalyst Company）主要从事环氧乙烷催化剂、脱NOx催化剂、脱VOx 催化剂的生产与销售，同时还进行技术转让。

在比利时根特和美国马丁内兹有两家生产厂。

CRI处理烟气的催化剂系统主要有三种：壳牌低温氮氧化物去除系统(SDS)CRI为各种静止火源和化工过程所产生的氮氧化物(NOx)提供壳牌低温氮氧化物去除系统(Shell DeNOx System, SDS)。

CRI特别研发的脱硝技术具备高效率、低工作温度的有利条件，特别在改建低温设备的情况下突出低成本的优势。

NOx Reduction CRI Selective Catalytic (SCR) NOx Reduction TechnologySince its commercial introduction in the 1970's,Selective Catalytic Reduction (SCR) of nitrogen oxides (NOx) has gained wide acceptance worldwide as the most effective and technologically proven method for high-percentage NOx removal from flue gases.CRI's technology, known as the Shell DeNOx System (SDS), operates on the SCR principal. It uses ammonia (NH 3) as the reductant and a catalyst to promote the reaction of NH 3 with NOx, formingnitrogen and water.An efficient retrofitThe CRI SCR catalyst can operate at lower temperatures and with lower pressure drop than conventional SCR catalysts. Consequently, the CRI SCR system can be installed immediately before or in the stack, thereby avoiding any modifications to combustion or heat-recovery equipment or negative effects on other upstream plant operations. This makes the CRI technology very cost-effective for retrofitSCR applications.Typical Application Conditions and Performance of the CRI Low-Temperature SCR Technology:Operating TemperatureTypical Application 325-450° F /160-230° CRange 300-700° F/ 150-375° CPressure DropTypical Application 2-3 in. H2O/ 5-7.5 mbarRange As low as 1 in. H2O/2.5 mbarPerformanceNOx Conversion >90%NH3Slip 5-10 ppm or lowerUnique catalyst and module technologyThe CRI technology differs from conventionalSCR systems in two important aspects: the catalyst and the catalyst reactor module. The catalyst is in the form of pellets and can be produced in a range of sizes and shapes to meet specific performance requirements. Due to the high activity of the catalyst, high NOx removal efficiencies with simultaneous control of NH3 slip can be obtained atrelatively low temperatures.The catalyst reactor module is based on the Lateral Flow Reactor (LFR) principal. The LFR is a packed-bed type reactor which offers the advantage of low pressure drop even at high space velocities. Furthermore, the LFR design makes possible the most efficient utilization of the SCR catalyst, which minimizes the amount of catalyst required and facilitates fast loading and unloading of catalyst from thereactor.Development of the LFR technology has resulted in a modular construction system, providing a high degree of flexibility in the design of SCR systems for specific applications, particularly retrofit.A broad range of applicationsThe CRI SCR technology has been successfully applied to combustion and chemical process operations including gas turbines, refinery heaters, boilers, ethylene cracker furnaces, nitric acid plantsand waste incineration facilities.Resulting from the high catalyst activity and flexibility of the LFR module design, the optimal and most cost-effective combination of NOx removal, NH 3 slip, temperature, pressure drop and available plot or duct space can be developed for virtually any application.去除氮氧化物系统（SDS）——世界上最好的低温脱硝技术和系统SCR催化剂，采用独特的侧流方式，具有效率高、压降小（<10~20mbar）、工作温度低（130~380℃）实际的造价和使用的成本低；氮氧化物的排除量<10~50PPMV，可去除60~98%氮氧化物；可按要求设计，广泛地应用于硝酸厂、已内酰胺厂、燃气轮机、燃煤燃气锅炉、垃圾焚烧炉、炼油厂加热炉、乙烯裂解炉等。

壳牌二恶英去除系统(SDDS)CRI为城市固废及危险废液焚烧处理设备产生的二恶英提供壳牌二恶英去除系统(Shell Dioxin Destruction System, SDDS)。

SDDS实现成本低，效率高的成功方案，能让客户达到最严格的二恶英排放标准。

CRI Catalytic Dioxin Destruction TechnologyDioxinsDioxins comprise a family of over 200 chemical compounds known as persistent organic pollutants, harmful by-products of industrial processes and waste incineration. Major sources of dioxinemissions include municipal solid, industrial liquid and medical waste incineration, as well as somechemical and metal sintering operations.Dioxins are potent carcinogens; their adverse effects also include neurological,developmental, reproductive and immunotoxic effects.The Shell Catalytic Dioxin Destruction System (SDDS) from CRI is a proven low-temperature technology for flue gas dioxin emission destruction, with excellent cost/performance benefits comparedto other dioxin emission control technologies.The Shell Dioxin Destruction SystemSingle-step simplicityUnlike technologies based on carbon adsorption, the CRI catalytic system destroys dioxin compounds in a single process step, with no subsequent processing needed. In addition, the CRI process does not require the addition of any reactant beyond the oxygen already in the flue gas. The CRI system uses a specially developed catalyst to convert dioxins to a mixture of harmless gases.Low emissions at low temperaturesThe CRI dioxin destruction catalyst enables dioxins to be reduced to extremely low levels at low flue gas temperatures, even as low as 320° F (160° C).Unique reactor designThe CRI dioxin destruction catalyst is contained in engineered stainless steel modules called lateral flow reactors, which expose the greatest amount of catalyst surface to the flue gas which gives thehighest performance with lowest pressure drop.High destruction efficiencyThe combination of high catalyst activity with the lateral flow reactor allows the Shell Dioxin Destruction System to easily achieve high dioxin destruction efficiency. From the highest inlet concentrations, the system can achieve over 99.9% destruction of dioxins and furans, down to the lowest worldwide regulated emission limit of 0.1 ng TEQ NM3.Flexible applicationsThe CRI catalytic dioxin destruction technology has been successfully applied to bo th liquid waste incinerators after the wet acid gas scrubber, and to solid waste incinerators after the acid gas and particulate removal systems. The low-operating temperature and the ability to design for low pressure drop allow the Shell Dioxin Destruction System to be positioned at the tail end of most existing processes,just prior to the stack.The Shell Dioxin Destruction System Process Flow ChartSolid Waste Incineration ApplicationHazardous Liquid Waste Incineration ApplicationEasy retrofitThe compact, lightweight nature of the system allows easy retrofit onto existing facilities where space is limited. Installation at the end of the process results in significant savings in installation andoperating costs, with minimal downtime for installation.先进环保工艺：壳牌去除二恶英系统（SDDS）选择性催化技术可以在低温下（100ºC）去除高达99.99%的二恶英，可达到0.01Ng/Nm³的世界最高标准。