【摘要】：大慶石化公司煉油廠制氫裝置采用烴類水蒸氣轉(zhuǎn)化法,原始設(shè)計是中變反應(yīng)之后由中變反應(yīng)器出來的中溫中變氣直接給除鹽水加熱,這樣不但造成能量浪費,而且還會使后部的空冷和水冷換熱器的負荷過大,尤其是夏季,嚴重時直接威脅到了變壓吸附系統(tǒng)(PSA)的穩(wěn)定運行。鑒于以上原因,通過對裝置現(xiàn)有流程的分析,最終確立了余熱回收技術(shù)改造方案,即在中變氣第二分液罐之后,中變氣空冷器之前加裝一臺余熱回收器,利用中變氣的過剩熱量與界區(qū)來的除鹽水進行換熱,利用中溫中變氣余熱提升除鹽水溫度。由于換熱后的除鹽水要進入除氧器除氧,而水中的溶解氧含量與溫度成反比,這樣就會節(jié)省除氧器蒸汽使用量。而經(jīng)過換熱之后的中溫中變氣溫度降低,減少了空冷的負荷。該工藝改造實施后,預(yù)計可將進入除氧器的除鹽水的溫度至少升高到77℃,同時減少除氧器中的1.0 MPaG蒸汽的消耗量和中變氣空冷器的用電量,起到節(jié)能的效果;同時可以保證在裝置較大負荷運行時除氧器內(nèi)的溫度達到除氧要求,有利于裝置的平穩(wěn)運行。對整個工藝改造的投資估算,融資方案,成本費用估算,項目獲利能力等經(jīng)濟指標的計算結(jié)果表明,本論文提出的工藝改造方案經(jīng)濟效益良好。該工藝改造的投資財務(wù)內(nèi)部收益率為15.85%,高于行業(yè)基準收益率。本論文所實施的改造項目完成后煉油廠制氫裝置的能耗減少量為976.12 MJ/噸工業(yè)氫,即23.31 kg標準油/噸工業(yè)氫。綜上所述,經(jīng)過優(yōu)化工藝流程的制氫裝置,能夠從多個方面降低裝置能耗和生產(chǎn)成本,能量利用也將更加合理。
[Abstract]:The hydrogen production unit of Daqing Petrochemical Company adopts the method of steam conversion of hydrocarbons. The original design is that the medium temperature and medium change gas produced from the medium temperature reactor directly heat the desalted water after the intermediate change reaction, which not only results in energy waste. Moreover, the load of the air-cooled and water-cooled heat exchangers in the rear part is too large, especially in summer, which directly threatens the stable operation of the pressure swing adsorption system (PSA). In view of the above reasons, through the analysis of the existing process of the plant, the technical retrofit scheme of waste heat recovery was finally established, that is, after the second liquid tank of the medium variable gas, a waste heat collector was installed before the intermediate variable air cooler. The excess heat of medium variable gas and the desalted water from the boundary area are used to exchange heat, and the temperature of desalted water is raised by using the residual heat of medium temperature variable gas. Since the desalted water after heat transfer has to enter the deaerator and the dissolved oxygen content in the water is inversely proportional to the temperature, the amount of steam used in the deaerator will be saved. After heat transfer, the medium temperature of medium temperature is reduced and the load of air cooling is reduced. It is expected that the temperature of desalted water entering the deaerator can be raised to at least 77 鈩，

本文編號：2166521