化肥生产工艺流程

全站基槽均为机械开挖，同时为保持一个平整的施工现场，达到文明施工的要求，根据现场情况将所挖出的土、石方只要不是立即回填的，便站外租地存放。Subsequently,theAnhuiArmymilitarySpecialBranch,inShanghai'sCentralIntelligenceOrganizationandtheCommunistpartyorganizationinWesternZhejiangProvince,sentpartybackbone,respectively,wenttoWuJiangyanopenedtheTomb,Tombofheroicpeople,undertheleadershipoftheCommunistParty,fearnosacrificeandpersevering,goaloftheanti-Japaneserevolutionarystruggle.(A)stationedinTaoyuanarea(Tombof)1,thenewarmyoftheCommunistPartyofChinaundergroundorganizationinSeptember1938,theCPCZhuangShaozhen(ZhuangZhen,Nanxunpeople)bytheDeputyDirectorofthepoliticalDepartmentofthearmyonDengZihui'sdispatch,operatingfromJingCounty,AnhuiProvince,theLakereachedtheTomb,itstasksare:lookingforreliableobject,introducethemtothenew,toexpandthenewteam.ZhuangShaozhenKMT-CPCcooperationasanopportunity,afterclassmatesYaoBi(Nanxunpeople,RenZhuxiforcestaffDirector),introducedintotheKuomintanggovernmentpoliticalteam,andasapoliticalleader.HeusedthisopportunitytoinviteprogressiveyouthHongHaiquanformapoliticalteam,atthispoint,theCountyGovernmenthasjustbeenestablished,localschool,unemployedyoutharemorequicklyabsorbedsheng,zhenze,Miaogang,Nanxun,huzhou,morethan20morethanrequired-Japaneseyouth.Inordertoraisethelevelofpoliticalplayersandtheabilitytowork,ZhuangShaozhenXuTemple,isfortheestablishmentofyouth...PoliticalactivitieswillsoonattracttheattentionoftheKuomintang.IsearlyZhuangShaozhenindicatingHongHaiquantoscoopthefirstelementaryschool,teacher'sidentityasacover,carryouttheparty'swork.However,CountyDirectorofeducationcomesintoaction.To第十五章化肥生产采用化学方法生产的含有氮、磷、钾等元素的肥料统称为化肥。主要的产品有氮肥、磷肥和钾肥。此外还有含有多种成分的复合肥料、混合肥料及微量肥料等。化肥生产，尤其是氮肥生产是一个复杂的连续化的工艺生产过程，需要在密闭的系统内，在高温、高压的条件下进行。其设备、管道繁多；原料、中间产品、成品多具有易燃、易爆性质，有的还具有腐蚀性和毒性。因此，化肥生产及其储运工作必须注意安全防火。第一节氮肥生产在各类化肥中，氮肥产量居第一位，氮肥工厂星罗棋布，多数县、市都有氮肥厂。氮肥生产火灾爆炸危险性也最大。氮肥生产就是将空气中游离态氮转变成化合态氮的过程，所以也常成为“氮的固定”。一、氮肥生产流程氮肥生产流程可概括为以下四个步骤：（1）造气—将原料制备成主要含有氢、氮气体的原料气。（2）精制—将原料气中氢、氮以外的杂质去除，使原料气得到精纯。（3）压缩与合成—将较为纯净的氮、氢比例为1：3的氮氢混合气体压缩到高压状态，在催化剂和高温的作用下合成为氨。（4）氨加工—将氨经进一步加工得氮肥。前三步常称为氨的合成。经进一步加工制得的成品如硝酸铵、尿素等都是化肥。从安全防火考虑，氮肥生产中以硝酸铵的生产过程最为典型，其他种类氮肥的火灾危险性及防火要求可以参照。以固体、液体燃料为原料制造硝酸铵的工艺流程如图所示。氮肥的生产总流程如表所示。氮肥生产总流程：脱硫原料准备变换造气水洗氨的合成精制铜洗压缩碱洗全站基槽均为机械开挖，同时为保持一个平整的施工现场，达到文明施工的要求，根据现场情况将所挖出的土、石方只要不是立即回填的，便站外租地存放。Subsequently,theAnhuiArmymilitarySpecialBranch,inShanghai'sCentralIntelligenceOrganizationandtheCommunistpartyorganizationinWesternZhejiangProvince,sentpartybackbone,respectively,wenttoWuJiangyanopenedtheTomb,Tombofheroicpeople,undertheleadershipoftheCommunistParty,fearnosacrificeandpersevering,goaloftheanti-Japaneserevolutionarystruggle.(A)stationedinTaoyuanarea(Tombof)1,thenewarmyoftheCommunistPartyofChinaundergroundorganizationinSeptember1938,theCPCZhuangShaozhen(ZhuangZhen,Nanxunpeople)bytheDeputyDirectorofthepoliticalDepartmentofthearmyonDengZihui'sdispatch,operatingfromJingCounty,AnhuiProvince,theLakereachedtheTomb,itstasksare:lookingforreliableobject,introducethemtothenew,toexpandthenewteam.ZhuangShaozhenKMT-CPCcooperationasanopportunity,afterclassmatesYaoBi(Nanxunpeople,RenZhuxiforcestaffDirector),introducedintotheKuomintanggovernmentpoliticalteam,andasapoliticalleader.HeusedthisopportunitytoinviteprogressiveyouthHongHaiquanformapoliticalteam,atthispoint,theCountyGovernmenthasjustbeenestablished,localschool,unemployedyoutharemorequicklyabsorbedsheng,zhenze,Miaogang,Nanxun,huzhou,morethan20morethanrequired-Japaneseyouth.Inordertoraisethelevelofpoliticalplayersandtheabilitytowork,ZhuangShaozhenXuTemple,isfortheestablishmentofyouth...PoliticalactivitieswillsoonattracttheattentionoftheKuomintang.IsearlyZhuangShaozhenindicatingHongHaiquantoscoopthefirstelementaryschool,teacher'sidentityasacover,carryouttheparty'swork.However,CountyDirectorofeducationcomesintoaction.To氮肥生产合成甲烷化氨水氨的加工硝酸铵尿素氨合成的工艺流程图：空气水蒸汽硫或硫化物水蒸汽固体原料或液体原料造气半水煤气脱硫半水煤压缩一二三段变换变换气变脱精脱脱碳甲烷化压缩四五六段合成氨硝酸铵的生产工艺流程图如下：氨气氧化稀硝酸中和硝酸铵液后处理成品空气水二、原料准备现在，氮肥生产多采用天然气、炼厂气、焦炉气、重油和煤和焦碳等气体、液体和固体原料。(一)固体原料主要有块状焦炭、无烟煤和其他物质制成的煤球等。这类原料虽属于丙类火灾危险性，但在运输、粉碎、筛分等过程中极易产生粉尘、四处飞扬。当空气中的粉尘浓度达到200~300g/m3时，遇明火、猛烈摩擦或雷击等因素，很容易引起爆炸和燃烧，而且爆炸强度很高。因此，要防止粉尘的积存和飞扬。运输和处理固体原料的设备应尽可能做到密闭。处理固体燃料的厂房要设排风除尘设备和水喷装置，以利除尘和增加空气中的湿度。要加强生产管理，做到每班清除积尘。厂房应为一、二级耐火等级的建筑。在使用粉煤气化造气的工厂，因储煤与煤气发生炉相通，煤斗内需通入压力大于发生炉内压力的氮气进行保护。若氮气压力不足或供应中全站基槽均为机械开挖，同时为保持一个平整的施工现场，达到文明施工的要求，根据现场情况将所挖出的土、石方只要不是立即回填的，便站外租地存放。Subsequently,theAnhuiArmymilitarySpecialBranch,inShanghai'sCentralIntelligenceOrganizationandtheCommunistpartyorganizationinWesternZhejiangProvince,sentpartybackbone,respectively,wenttoWuJiangyanopenedtheTomb,Tombofheroicpeople,undertheleadershipoftheCommunistParty,fearnosacrificeandpersevering,goaloftheanti-Japaneserevolutionarystruggle.(A)stationedinTaoyuanarea(Tombof)1,thenewarmyoftheCommunistPartyofChinaundergroundorganizationinSeptember1938,theCPCZhuangShaozhen(ZhuangZhen,Nanxunpeople)bytheDeputyDirectorofthepoliticalDepartmentofthearmyonDengZihui'sdispatch,operatingfromJingCounty,AnhuiProvince,theLakereachedtheTomb,itstasksare:lookingforreliableobject,introducethemtothenew,toexpandthenewteam.ZhuangShaozhenKMT-CPCcoop