您好,欢迎访问三七文档
当前位置:首页 > 行业资料 > 酒店餐饮 > 啤酒发酵过程中的PLC应用--毕业设计论文
1杭州电子工业学院毕业设计(论文)题目啤酒发酵过程中的PLC应用分院自动化学院专业自动化班级99612姓名指导教师柴利吕永杰俞文光2003年06月01日2啤酒发酵过程中的PLC应用摘要发酵技术是世界上最先进的农艺生物工程学技术。在啤酒酿造过程中有三种主要的成分:水,谷物和HOPS(啤酒花)。尽管酵母被认为是发酵过程的催化剂,而不仅仅它自身只是作为一种成分,但它仍然是酿造过程中一个很基本的因素。作为一门学问,或者说是一门艺术也好,酿造也是很基本的。而不仅仅是将水和谷物转化成啤酒的一个简单过程。最基础的就是,它是由下列过程组成的:谷物(主要是麦汁)和水的混合物,酵母是用来促进发酵的,啤酒花则是用来增加芳香和气味的。发酵控制系统的任务就是将发酵酒液的实际温度控制在和标准发酵曲线相差有限的误差范围内。啤酒生产过程分为麦芽制造、麦芽汁制造、前发酵、后发酵、过滤灭菌、包装等几道工。其中前发酵是啤酒发酵的主要过程,在这个过程中,酵母完成了增殖,厌氧发酵及其沉淀回收等。这个过程消耗了大部分可发酵性糖和可同化性氮等麦汁成分,排出的发酵代谢产物即啤酒的主要组成。而后发酵就是对主发酵的残糖继续发酵,达到要求的发酵度,排除氧气,增加酒精中的CO2的溶解量。促进发酵液成熟,改善口味,促进啤酒自然澄清,使其具有良好的稳定性。我们是用SIMATICS7来控制啤酒发酵的这个过程,编写程序主要控制温度、CIP、麦汁进罐等。选择硬件并实现它们之间的联系,编写OB,FB,FC等,并通过在OB中调用FB,FC等来实现程序。并到现场进行调试。当以STEP7编程时,不要求特别的顺序,但是,在大多数项目中必须满足某些基本的任务。编程的内容主要包括梯形图和语句表,在我编写的程序中,主要是语句表,在语句表中,递增地检查语法,如果你使用语句表指令编写程序,则STEP7在你输入每一指令之后检查语法。关键词啤酒发酵PLC(SIMATICS7)温度控制CIP。3TheApplyofPLCintheProcessofBeerFermentAbstractsFermenttechnologyisamostadvancedagriculturebioengineeringtechnologyintheworld.therearethreemainingredientsinbeer–watergrainandhops.Yeastisalsoabasicpartofthebrewingprocess,althoughitisconsideredacatalystforfermentationratherthananingredientinandofitself。Asmuchanartasascience,brewingisthefundamental,yetnot-so-simplepracticeofchangingwaterandgrainintobeer.Atitsmostbasic,theprocessconsistsofthemixtureofgrain(primarilymaltedbarley)andwater,yeastisintroducedtoinitiatefermentationandhopsareaddedforflavorandaroma.Thetaskoffermentcontrolsystemistomaketherealtemperatureoffermentliquidaslargeasthestandardfermentcurve,theprogressofbeerproductionconsistsofmaltproduction,wortproduction,formerferment、latterferment、filtration、casingandsoon.Formerfermentisthemainfermentprocessofthese,inthiscourse,yeastachievesproliferate,oxygen-detestedfermentanddepositionreclaimetc.Thisprocessconsumesmostwheatliquorcomponent.andthefermentmetabolizeoutcomesarethemainconstituteofbeer.Latterfermentisthego-onoftheformerferment,itaimsathigherdegreeofferment,getridofO2,andincreasethemeltquantityofCO2inthealcohol.promotetheliquidoffermenttomaturate,improvetasteandmakethebeerclearnaturally.Afterwordsitcanbedeliveredtofiltrate。WeuseSIMATICSTEP7tocontroltheprocessofbeerferment,compileprogramprimarilytocontroltemperature、CIPandsoon.wechoosehardwareandcarryoutthecontactbetweenthem,compileOB、FB、FCandsoon,andviatransferringFB,FCinOBtocometruetheprogram.Itdoesn’tneedspecialorderwhenprogrammingwithSTEP7,butitmustmeetsomebasictaskinthemostitems。Thecontentsofprogrammingprimarilycontainechelonplotandsentencelist,ItmajoredinsentencelistintheprogramIcompile,andinit,STEP7willchecktheparlanceafteryouinputaninstructionifyoucompileaprogramwithasentencelistKeyWordsBeerfermentPLC(SIMATICSTEP7)temperaturecontrollingCIP4目录第一章引言..................................................................................................................................................5第二章PLC概述.........................................................................................................................................62.1由来和发展..........................................................................................................................................62.2工作原理..............................................................................................................................................62.3构成......................................................................................................................................................62.4特点......................................................................................................................................................72.5优势......................................................................................................................................................82.6SIMATICS7介绍.................................................................................................................................9第三章啤酒的概述.....................................................................................................................................113.1啤酒的生理作用.................................................................................................................................113.2世界啤酒的历史.................................................................................................................................113.3我国的啤酒历史:............................................................................................................................123.4啤酒的生产工艺流程图:................................................................................................................123.5研究啤酒的意义................................................................................................................................133.6啤酒发展的前景................................................................................................................................14第四章控制初步设计................................................................................................................................154.1前言.......................
本文标题:啤酒发酵过程中的PLC应用--毕业设计论文
链接地址:https://www.777doc.com/doc-5890465 .html