简介:摘要随着我们国家重视资源节约和环境保护,积极倡导“节能降耗”,改变粗放型增长方式,走新型工业化道路,加大淘汰关停耗能高、污染重、设备陈旧机组的力度,降低发电成本,提高电力企业经济效益,提高发电厂的竞争能力,日益成为电力企业的必选之路。
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简介:作为称谓的N1+N2式定中粘合结构非常普遍,且构词能力最强、能产性最高.本文以“N+汤”类语法结构为例,虽然形式都表现为N1+N2,但是结构内部却存在着语义差异性.对这一结构语义模式的分析,不仅会使我们对该语法结构有更深入细致的认识,还有助于对外汉语中留学生对此类结构的语义理解.
简介:Elevatedatmosphericnitrogen(N)depositionhasbeendetectedinmanyregionsofChina,butitseffectsonsoilNtransformationintemperateforestecosystemsarenotwellknown.WethereforesimulatedNdepositionwithfourlevelsofNadditionrate(N0,N30,N60,andN120)for6yearsinanold-growthtemperateforestinXiaoxing’anMountainsinNortheasternChina.WemeasuredgrossNtransformationratesinthelaboratoryusing15NtracingtechnologytoexploretheeffectsofNdepositiononsoilgrossNtransformationstakingadvantageofNdepositionsoils.NosignificantdifferencesingrosssoilNtransformationrateswereobservedafter6yearsofNdepositionwithvariouslevelsofNadditionrate.ForallNdepositionsoils,thegrossNH4+immobilizationrateswereconsistentlylowerthanthegrossNmineralizationrates,leadingtonetNmineralization.Nitrate(NO3-)wasprimarilyproducedviaoxidationofNH4+(i.e.,autotrophicnitrification),whereasoxidationoforganicN(i.e.,heterotrophicnitrification)wasnegligible.Differencesbetweenthequantityofammonia-oxidizingbacteriaandammonia-oxidizingarchaeawerenotsignificantforanytreatment,whichlikelyexplainsthelackofasignificanteffectongrossnitrificationrates.GrossnitrificationratesweremuchhigherthanthetotalNO3-consumptionrates,resultinginabuild-upofNO3-,whichhighlightsthehighriskofNlossesviaNO3-leachingorgaseousNemissionsfromsoils.ThisresponseisoppositethatoftypicalN-limitedtemperateforestssufferingfromNdeposition,suggestingthattheinvestigatedold-growthtemperateforestecosystemislikelytoapproachNsaturation.
简介:摘要近年来国内经济快速发展,电力资源的供应起到了至关重要的作用。国内电力主要来自火力发电机组,其中单机容量为300MW与600MW的机组占据了火力发电的绝大部分,这也是为了响应国家节能减排的战略方针,优胜劣汰后形成的局面。600MW机组作为火力发电的主力设备,脱硫系统的效率对火电厂烟气的排放影响较大,因此本文将以600MW机组的脱硫系统作为研究对象,分析其烟气系统、除雾器、石膏脱水系统等设备,对常出现的问题进行分析,解决现有系统的不足指出,优化脱硫系统的整体性能。研究显示通过对现有脱硫系统进行设备改造,可以有效的提升烟气脱硫效率,改进现有的脱硫工艺,为600MW机组脱硫系统的改造提供指导。