【正文】 nce biogas can be an alternative fuel of petrochemical natural gas, it is possible to increase the development of methane gas supplies to alleviate the energy crisis. This paper describes a washing method is a mon method for purifying biogas abroad. It uses CO2, CH4 difference in solubility in water to separate, is a relatively inexpensive method of purification, in particular it does not need to be regenerated water when its economy is more obvious. Study its control system to effectively save resources, improve efficiency, reduce human error, improve product quality. Bring safe and convenient operation. Keyword： Biogas purification Biogas upgrading with water Control sys1 引言 ..........................................................1 課題研究背景及意義 .......................................................................................................... 1 國(guó)內(nèi)外沼氣提純技術(shù)的發(fā)展現(xiàn)狀 ...................................................................................... 3 沼氣組分及特性 .................................................................................................................. 5 沼氣水洗提純技術(shù)介紹 ...................................................................................................... 5 本章小結(jié) .............................................................................................................................. 7 2 系統(tǒng)方案設(shè)計(jì) ..................................................7 控制方案一 .......................................................................................................................... 7 控制方案二 .......................................................................................................................... 8 控制方案選擇 ...................................................................................................................... 9 傳感器參數(shù) .......................................................................................................................... 9 控制系統(tǒng)設(shè)計(jì)方案優(yōu)化 .................................................................................................... 11 沼氣壓力水洗提純流程圖 ................................................................................................ 12 本章小結(jié) ............................................................................................................................ 13 3 硬件電路設(shè)計(jì) .................................................13 總體硬件電路原理圖 ........................................................................................................ 13 單片機(jī)最小系統(tǒng) ................................................................................................................ 14 電流轉(zhuǎn)電壓模塊 ................................................................................................................ 15 轉(zhuǎn)換模塊 ...................................................................................................................... 16 顯示模塊 ............................................................................................................................ 17 本章小結(jié) ............................................................................................................................ 18 4 控制系統(tǒng)軟件設(shè)計(jì) .............................................18 控制系統(tǒng)控制要求 ............................................................................................................ 18 系統(tǒng)軟件主流程圖 ............................................................................................................ 19 控制部分主程序 ................................................................................................................ 19 延時(shí)子程序 ........................................................................................................................ 21 轉(zhuǎn)換程序 ...................................................................................................................... 21 本章小結(jié) ............................................................................................................................ 21 5 系統(tǒng)調(diào)試 .....................................................21 常熟 理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 2 線性度確認(rèn) ........................................................................................................................ 21 工作流程驗(yàn)證 .................................................................................................................... 22 本章小結(jié) ............................................................................................................................ 23 6 總結(jié)與展望 ...................................................23 總結(jié) .................................................................................................................................... 23 問(wèn)題展望 ............................................................................................................................ 24 參考文獻(xiàn) .......................................................25 致謝 ...........................................................26 附錄 ...........................................................27 附錄 1,軟件代碼 ...................................................................................................................... 27 附錄 2 模塊實(shí)物圖 ................................................................................................................. 34 常熟 理工學(xué)院畢業(yè)設(shè)計(jì)（論文） 1 1 引言 經(jīng)濟(jì)的發(fā)展總是伴隨著能源的消耗，發(fā)展越快，能源消耗的也就越快 。 由于生物天然氣可以直接作為石化天然氣的替代燃料，所以可以發(fā)展沼氣增加天然氣供應(yīng)從而緩解能源危機(jī)。日益增長(zhǎng)的能源需求和日漸嚴(yán)重的環(huán)境污染迫使我們尋找解決能源危機(jī)的 突圍 之路。學(xué)校有權(quán)保留并向國(guó)家有關(guān)部門或機(jī)構(gòu)送交論文的復(fù)印件和電子版，允許畢業(yè)設(shè)計(jì) (論文 )被查閱和借閱；學(xué)?？梢詫厴I(yè)設(shè)計(jì) (論文 )的全部或部分內(nèi)容編入有關(guān)數(shù)據(jù)庫(kù)進(jìn)行檢索，可以采用影印、縮印或掃描等復(fù)制手段 保存、匯編畢業(yè)設(shè)計(jì)（論文），并且本人電子文檔和紙質(zhì)論文的內(nèi)容相一致。除文中已經(jīng)注明引用的內(nèi)容外，本論文不含任何其他個(gè)人或集體已經(jīng)發(fā)表或撰寫(xiě)過(guò)的作品成果。對(duì)本文的研究做出重要貢獻(xiàn)的個(gè)人和集體，均已在文中以明確方式標(biāo)明。 保密的畢業(yè)設(shè)計(jì) (論文 )在解密后遵守此規(guī)定。其中，發(fā)展替代能源，實(shí)現(xiàn)傳統(tǒng)能 源之間，傳統(tǒng)能源與新能源之間的替代，是解決我國(guó)能源供需 瓶頸 、 供需結(jié)構(gòu)性矛盾以及減輕環(huán)境壓力的有效途徑。 本文主要介紹了國(guó)內(nèi)外 常見(jiàn)沼氣提純方法中的水洗法，它是 利用 CO CH4 在水中溶解度的差異實(shí)現(xiàn)分離，是一種相對(duì)廉價(jià)的提純方法，尤其在不需要對(duì)水進(jìn)行再生處理的時(shí)候其經(jīng)濟(jì)性更加明顯。如今地球的煤，石油，天然氣等不可再生資源的儲(chǔ)存量來(lái)說(shuō)，已經(jīng)漸漸跟不上其消耗的速度。開(kāi)發(fā)新能源，尋找替代能源，提高能源利用