PCS7在玉米油精制生产中的应用.pdfPCS7在玉米油精制生产中的应用pdf,PCS7在玉米油精制

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详细说明：PCS7在玉米油精制生产中的应用pdf,PCS7在玉米油精制生产中的应用SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用控制系统完成的功能 SIMATIC PCS7是西门子公司结合最先进的计算机软、硬件技术,在西门子公司 S5,S7系列可编程控制器及 TELEPERM系列集散系统的基础上,面向所冇过程控制应用场合的先进过程控制系统。 SIMAT|CPCs7过程控制系统具备了以下几个方面的特点: 高度的可靠性和稳定性 ●高速度,大容量的控制器 ●客户/服务器的结构 ●集中的,从上到下的组态方式能灵活、可靠地嫁接于老系统 ●集中的,友好的人机界面含有配方功能的批量处理包开放的结构,可以同管理级进行通讯同现场总线技术溶为一体 SIMATIC PCS7采用优秀的上位机软件 Wincc作为操作和监控的人机界面,利用开放的现场总线和工业以太网实现现场信息采集和系统通讯,采用S7自动化系统作为现场控制单元实现过程控制,以灵活多样的分布式I/0接收现场传感检测信号。 SIMATIC PCS7的通讯系统采用的是工业以太网和 PROFIBUS现场总线。工业以太网用于系统站之间的数据通讯, PROFIBUS用于现场控制及检测采集单元的数据交换。 PROF TBUS现场总线是基于国际标准EN50170的开放的现场总线,采用令牌调度原理进行数据通讯,主要包括最高波特率可达12M的高速总线 PROF LBUS一DP(H2)和用于过程制的本安型低速总线 PROFIBUS一PA(I)DP和PA的完美结合使得 PROFIBUS现场总线在结构和性能上优越于其他现场总线。 PROFIBUS既适合于自动化系统与现场信号单元的通讯,也可用于可以直接连接带有接口的变送器、执行器、传动装置和其它现场仪表及设备,对现场信号进行采集和监控,并且用一对双绞线替代了传统的大量的传输电缆。大量节省了电缆的费用,也相应节省了施工调试以及系统投运后的维护时间和费用。根据统计,使用 PROFIBUS可以使工程总造价降低20-40%。 SIMATIC PCS7釆用符合IEC一1131-3国际标准的编程软件和现场设备库,提供连续控制、顺序控制及高级编程语言。现场设备库提供大量的常用的现场设备信息及功能块,可大大简化组态工作,缩短工程周期。四、项目的工艺及控制方案 A&D Service Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用工芒顺序:玉米毛油一脱胶一中和一冲洗一漂白一过滤一结晶一软塔脱臭一成品精制油 1.脱胶操作画面流程图 20/00-0410:11:55CornOll/G10'()ConOll 1 OD reques 03是时国[34冬口 a圈工出停|四和园6[蚂[习闺《彐耐 man4 ]301 3301 說泉计 M四图国 111n1 蒸汽 E3302 E33 3303 长=n2m, 厂「「,「,「「,「「 m「。「雪WmE小:n到 iMATIC Man-gH,到 Wwincc-Runtine: C-C: [NEUTRALISATI將ADAL用03平2Pm」中和过程工艺要求中和算法 Neutralisation Amount of lye require for neutralisation can be calculated as shown below, Oil tlow-Kg/hr, Some ft comes in l/hi Density of Oil-Kg/L FFA( Free Fatty Acid )-Fraction Lye Excess-Factor Molecular Weight-Factor Lye normality-Nc Lye Amount- L/hr(Naoh -Sodium hydroxide H3PO4-Phosphoric acid OilFlow* Density FFA Lyeexcess ye amount Molecularweight* lvenormality Note: In this case we do not need to multiply by density since the ft measured in Kghr A&D Service Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用 Lye Amount(/hr) Flow (Rawvalue FFA% H3P04 Dosed Naoh Excess Dosed FT Range)米 Maxscale 100 FFA Mole weight* LyeNormality 1000 LyeAmount P3307SP= * P3307 Setpoint Max StrokelengthAmount Example, the maximum stroke length of the pump can pump in 120 L/hr. That is, if plc give a 20mA output to the pump. Then 120 litre of Lye will be injected to the plant every hour Therefore, the calculated output(P3307SP) will be in raw value 0 to 65535 which correspond to 4 to 20 ma outpu Oil flow-The actual oil flow rate reading from Flow transmitter. The input to plc will be 4-20mA correspond to 0-65535 depending on type of PLC used. The MaxScale will be 65535 in this case. Inorder to calculate for the actual value we divide by the maxscale and multiply by the max Ft range of Flow Transmitters. Example, the range of FT is0-9500 Kg/hr. Then the FT range will 9500 FFA%-Free Fatty Acid will vary with the type of oil used. The FFA% will be determined in the lab This value will be entered by operator as %o. From the formula we divide the ffa%o by 100 for calculation. Since the amount key in is in percentage H3 PO4 Dosed is also entered by operator as % For every 1% of FFA%, we will dose 0. 1 of H3PO4. That is why we divide the h3Po4 by 10. H3 PO4 is added for degumming purpose Density-Here refer to the density of oil. Example 0.87 Naoh Excess Dosed- This is the extra amount of naoh we would like to add it in Usually around 20% more Since it is express as %o we divide it by 100. By adding l,we have 1. 2 which is 1 20% of naoh to be added FFA Mole Weight- Molecular weight divided by 1000 LyeNormality- This value is obtained from the %o of raw concentration of lye used. From the naoh table we can convert the concentration to normality Example, 40% correspond to 14.3. Desire flow rate of Pump(amount of Phosphoric acid) Flow(Rawvalue*FT Range)*( h3P04 Dosed Mo arcane 100 1692 A&D Service Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用 P3305SP=( Desired flow rate of pump x flow Rate of pi )*65535(P3305 Setpoint) 1/11 The operator keys h3Po4's concentration in percentage Hence we need to divide it by 100 to convert it to a real value. This value is then multiplied by the oil flow (kg/hr). It is further divided by the density of the Phosphoric acid at 85% concentration. Density of phosphoric acid at 85% concentration is 1692kg/m. The result will then be in m/hr. as the desired flow rate of the pump is in L/hr, we need to multiply it by a 1000 Once we obtain the desired flow rate in l/hr. we need to convert it back to raw values so that we can have 4-20mA output which corresponds to the flow rate. The Max flow rate of pump has units of / hr Calculation for amount of water require for dilution amount of water to be added for dilution Lye Amount*Lye Normality 100 FIC3320ISP=(( )-Lye Amount ) Process Lye Normality FlC3320Range ProcessLyeNormality- This value is obtained from the %desired concentration of lye used From the Naoh table we can convert the concentration to Normality. For example, when we want to change the raw concentration form 40%o to 20% the process lye normality will be 6.09 Naoli table e YoNah SG 188 10.2 7 1.0758 2.18 1.0869 2.47 12.9 1.0979 2.78 14.2 10 1.1089 3.08 15.5 3.39 168 12 1309 18.0 13 1.1419 4.03 19.2 14 1.1530 4.36 20.4 15 1710 4.7 16 1.1890 5.04 22.8 17 1931 5.38 23.9 18 1972 5.74 25.0 19 1.2082 6.09 26.1 20 1.2191 6.46 27.2 21 12301 6.83 282 22 1.2411 721 29.2 23 1.2520 7.58 30.2 24 1.2629 7.97 31.1 25 12739 8.35 32.1 26 1.2848 8.75 33.0 27 1.2956 34.0 28 1.3064 9.5 34.9 29 3172 9.97 35.8 30 1.3279 A&D Service Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用 10.8 37.5 32 1.3490 11.7 39.1 34 3545 12.5 7 36 1.3650 13.4 42.2 38 1.3710 14.3 43.6 40 1.3800 152 45.0 42 14101 16.1 46.3 44 1.4300 17.1 46 1.4495 18.1 48.8 48 14685 19.1 49.9 50 1.4873 LYE AMOUNT: OIL FLOW*(FFA/100+H3P04 DOSED/10 *(NAOH EXCESS DOSED/100+1)/(FFA MOLE WEIGHT/1000 LYE NORMALITY P3307SP: =( LYE AMOUNT/MAXSTrokeLength Amount)*65535 DESIRE FLOW RATE OF PUMP: OIL FLOW(H3 PO4 DOSED/ 100)1000/1692 P3305SP: (DESIRE FLOW RATE OF PUMP/MAX flow rate of pump) *65535 FIC33201SP: ((LYE AMOUNT "LYE NORMALITY/ProceSs LYE NORMALITY)- LYE AMOUNT)-(1000/FIC33201Range) 中和操作画面流程图 :0/08/04 10:10: 06 Corn Oil/ 10/7)Corn Oil 1 OB request: 0B34 still being processed 圖口[L。私基裴则□母 03囗四匚。3未油油高停中和团初旬閔秋娴中和设置 T3303 330 表」调配计算 F=A 15 过度的碱碱《浓的铖(获的油流量 ka/h g 3301 手列流重热水太M1 P3307如碱量 /h P3305碳畯量 19 1/h c33203 1330T T330 蒸 FTc33201如水量 15761kg/h LALI E3303 E3304 脚 T3305 设走到 E3301E3301 P3309 圖国酉匾囻岡圖囟圖國國 A&D Service Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用冲洗操作画面流程图 20/08/04 10: 12: 16 TOLEDO/CURRENT WEIGHPV: Low Alam 回圖同20c4m4 术储逸从学化引喜发 C 净区中和国[[ 水蒸汽 T3301 汽 E332U4 PT33201 3305 3306 LC33210 T0J01 —m《燕汽 Pj311 v v3301 X33201 E333E3303 4302T-3420 国回圖圖四中國國圜圖國 4 漂白过程工艺要求漂白算法:更据FT33301(粗油)实际流量动态计算漂白十的一削白十量,从而掉制相关进料阀及电机的交替开关时间. Bleaching Earth Dosing BE dosing is the control of calculated amount of bleaching powder to be added in to the vacuum tank C3301 base on the flowrate Fic33301. Ilowever, operator is allow to use a bypass flowrate entered in the HMI whenever the flow transmitter is malfunction or a constant dosing is desire. BE Doserate has to be calculated every program scan due to the continously changes in flowrate Depending on Bypass or Actual flowrate is selected BEBypass-Boolean 1-True 0-False A&D Service Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用 When BEBypass is set to true then the bypass value(Fic33301BY) will be selected else the actual flow rate fic3301 will be selected for calculation BEBypass =0 BEBypass F|C33301BE=FC3331FC33301BE=F|C330BY FIC33301-real Actual flow rate FIC33301BY-real Bypass flow rate key in by user from the hM FIC33301BE-real This tag is use for calculation. Actual or Bypass flowrate will move into this tag for calculation BE Doserate =(BE per Dose/Time Taken) Kg/h BE Doserate- the amount of bleaching earth to be dose every hour. BEperDose-Size of the chamber container. That is the amount of bleaching earth in the container CrudeOilSG FIC33301BE*1000* BE%/ E Doserate g/nr 100 1m is equal to 1000L and 1L equal to 1Kg, if FIC33301 is measured in m/hr then we need to multiply by1000 BE%- This value is entered by operator which determine the percentage of bleaching earth to be added CrudeoilSG-Specific gravity of Oil (0.87) To compute to total amount of Bleaching Earth going into the system apply the formula below whenever the bottom Valve open(X33302OFB= 1) If X333020FB== 1 then AccumulatedBE= AccumulatedBE BeperDose end if The calculated Time will be the interval time for opening/closing of valve X 33301 TP=Timer Preset TATimer accumulated value Tim Dn= Time up for timer or Timer done bi Standby BEDOSE RU STT BEDose 1 And X33302CFB= 1 And LAL33302=0 BEDose Run=1 P3316FB(1->0) FIC33301BE>1000(Raw Or StP BE Dose 1 Value) Standby 2 Start betimer TP=BETimerTP(calculated BETimDn=1 P3316FB(1->0) Or stp be dose 1 &D Service& Support SIEMENS西门子全集成自动化过程控制系统PCs7在玉米油精制生产中的应用 X33301Run-1 And e-stop=0 P3316FB(1->0 X33301OFB=1 Or stP be dose 1 L3304Run=1 4 Start X33301Timer TP-3 S X3330I TimDn P3316FB(1->0 Or StP be D X33301CFB-1 P3316FB(1>0) Or StP BE Dose =1 Start IntervalTimer TP=3 S Interval TimDn=1 P3316FB(1->0) Or STP BE Do X33302Run=1 -stop 0 7 Start X33302Timer TP=3 Sec P3316FB(1->0) X33302TimDn Or stP be dose 1 8 X33302Run=0 BETimDn= l P3316FB(1->0) Or STP BE Dose 1 Reset betimes A&D Service Support 10

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