發(fā)布時(shí)間：2018-04-18 09:05

  本文選題：高速氣體 + 流量計(jì)校準(zhǔn)��； 參考：《東華理工大學(xué)》2015年碩士論文

【摘要】：為了解決標(biāo)準(zhǔn)表法校準(zhǔn)系統(tǒng)無(wú)法進(jìn)行高速氣體流量校準(zhǔn)的問(wèn)題,本文依據(jù)正壓標(biāo)準(zhǔn)表法設(shè)計(jì)了一套高速氣體流量計(jì)校準(zhǔn)系統(tǒng)。通過(guò)對(duì)系統(tǒng)的不確定度理論分析,并借助計(jì)算機(jī)流體仿真技術(shù)CFD對(duì)系統(tǒng)的結(jié)構(gòu)進(jìn)行了仿真分析,論證了系統(tǒng)設(shè)計(jì)方案的可行性。本系統(tǒng)通過(guò)空壓機(jī)提供氣源,氣體通過(guò)前儲(chǔ)氣罐后流向標(biāo)準(zhǔn)表區(qū),其后經(jīng)由后儲(chǔ)氣罐流向待測(cè)表區(qū)。通過(guò)改變?nèi)饭軓椒謩e為DN20、DN50和DN50的標(biāo)準(zhǔn)管道閥門開(kāi)度,選通三路管徑分別為DN20、DN32和DN50的待測(cè)表管道,實(shí)現(xiàn)氣體流量計(jì)從低速到高速的流量校準(zhǔn),其中三路標(biāo)準(zhǔn)表和三路待校準(zhǔn)表的安裝位置為通過(guò)CFD仿真確定的。系統(tǒng)采用PLC-CPU224作為主控制器,以電動(dòng)調(diào)節(jié)閥為被控對(duì)象,通過(guò)PID算法和閥門開(kāi)環(huán)控制調(diào)節(jié)閥門開(kāi)度進(jìn)而實(shí)現(xiàn)管道流速的控制,其中系統(tǒng)的閉環(huán)控制傳遞函數(shù)及整定參數(shù)為通過(guò)機(jī)理法和階躍響應(yīng)法結(jié)合使用,并借助于Matlab工具Simulink仿真得出的。在實(shí)際運(yùn)行過(guò)程中將系統(tǒng)的過(guò)程量利用組態(tài)軟件MCGS進(jìn)行實(shí)時(shí)顯示,并實(shí)時(shí)改變流量設(shè)定量和閥門開(kāi)度值。經(jīng)過(guò)對(duì)系統(tǒng)的校準(zhǔn)范圍、控制相對(duì)誤差、不確定度、重復(fù)性和穩(wěn)定性的實(shí)驗(yàn)研究,結(jié)果表明:校準(zhǔn)系統(tǒng)的擴(kuò)展不確定度為0.76%;流量校準(zhǔn)范圍為10-910m3/h(對(duì)應(yīng)的在DN50管道內(nèi)的流速范圍為1.4-128.7m/s);系統(tǒng)的控制相對(duì)誤差和校準(zhǔn)相對(duì)誤差都在1%以內(nèi)。
[Abstract]:In order to solve the problem that the calibration system of standard meter can not carry out high speed gas flow calibration, a calibration system of high speed gas Flowmeter is designed according to the positive pressure standard meter method in this paper.By analyzing the uncertainty theory of the system and using the computer fluid simulation technology CFD, the structure of the system is simulated and analyzed, and the feasibility of the system design scheme is proved.The system provides the air source through the air compressor, the gas flows through the front tank to the standard meter area, and then through the rear gas storage tank to the area to be measured.By changing the opening degree of the standard pipe valve with the diameter of DN20 / DN50 and DN50 respectively, and selecting the pipeline to be measured with the diameter of DN20 / DN32 and DN50 respectively, the flow calibration of gas Flowmeter from low speed to high speed can be realized.The installation positions of three standard tables and three channels to be calibrated are determined by CFD simulation.The system adopts PLC-CPU224 as the main controller and the electric regulating valve as the controlled object. Through the PID algorithm and the valve open loop control the valve opening to realize the control of the pipeline velocity.The closed-loop control transfer function and tuning parameters of the system are obtained by the combination of mechanism method and step response method, and by means of Simulink simulation with Matlab tool.The process quantity of the system is displayed in real time by configuration software MCGS, and the flow setting and valve opening value are changed in real time.After an experimental study of the calibration range of the system, the control of relative error, uncertainty, repeatability and stability,The results show that the extended uncertainty of the calibration system is 0.76, the flow calibration range is 10-910m3 / h (the corresponding velocity range in the DN50 pipeline is 1.4-128.7 m / s ~ (-1)), and the control relative error and the calibration relative error are within 1%.
【學(xué)位授予單位】：東華理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TH814

【參考文獻(xiàn)】

相關(guān)期刊論文 前1條

1 李剛,任金云,張濤;高準(zhǔn)確度標(biāo)準(zhǔn)表法流量標(biāo)準(zhǔn)裝置的研究[J];化工自動(dòng)化及儀表;1999年05期

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本文編號(hào)：1767693