【摘要】：隨著石油化工對(duì)C2+輕烴需求的日益增長(zhǎng),回收分離C2+輕烴為主的深冷分離裝置的優(yōu)化操作備受關(guān)注。通過(guò)深冷裝置的模擬計(jì)算,分析裝置的存在的問(wèn)題,找出操作參數(shù)對(duì)產(chǎn)品收率的影響規(guī)律,對(duì)降低深冷裝置運(yùn)行成本、提高輕烴收率具有重要指導(dǎo)意義。本文采用HYSYS模擬軟件對(duì)天然氣深冷裝置進(jìn)行模擬與優(yōu)化,在對(duì)裝置進(jìn)行物料衡算的基礎(chǔ)上,對(duì)脫甲塔、動(dòng)設(shè)備、換熱器等設(shè)備的生產(chǎn)運(yùn)行狀況進(jìn)行核算,分析了現(xiàn)有裝置存在的主要問(wèn)題,提出了相應(yīng)的改造建議。結(jié)果表明:(1)在處理量為24145.85Nm3/h(設(shè)計(jì)處理量為25000Nm3/h)時(shí),裝置各操作參數(shù)平穩(wěn),輕烴回收率為28.1%,比設(shè)計(jì)值33.3%低,而干氣回收率為62.6%,比設(shè)計(jì)值60.5%高。乙烷收率和輕烴中C1/C2摩爾比符合設(shè)計(jì)要求。(2)塔底抽出取熱量提高,塔底溫度升高,且塔底抽出取熱量與塔底溫度之間呈線性關(guān)系;(3)隨著塔頂溫度的降低,萬(wàn)方氣輕烴收率升高;塔頂溫度由-70℃降低-2℃時(shí),輕烴產(chǎn)量由6802.35kg/h提高到6965.37kg/h,萬(wàn)方氣輕烴收率由2.82t升高到2.88t,按日處理量58×104m3計(jì),每天可以多產(chǎn)輕烴3.48t,其效益可觀。(4)輕烴產(chǎn)率隨制冷深度變化較大,其變化規(guī)律基本呈線性關(guān)系;制冷溫度每降低10℃,輕烴產(chǎn)量提高0.4108t輕烴/104m3原料氣;如果按60×104Nm3/天計(jì),每天可多產(chǎn)輕烴24.65t,每年可多產(chǎn)輕烴8997.3t。(5)脫甲烷塔塔頂、塔底溫度是相互影響的,在不同塔頂溫度下,最佳的塔底溫度會(huì)變化,為了將這兩個(gè)因數(shù)控制好,達(dá)到最佳操作狀態(tài),通過(guò)模擬計(jì)算和分析發(fā)現(xiàn)塔頂和塔底溫差在103℃左右,這樣可以保證塔底輕烴中C1/C2摩爾比不大于0.03。
[Abstract]:With the increasing demand for C2 light hydrocarbons in petrochemical industry, the optimization operation of the cryogenic separation unit for the recovery and separation of C2 light hydrocarbons has been paid more and more attention. Through the simulation calculation of the cryogenic unit, the existing problems of the unit are analyzed, and the influence of the operating parameters on the product yield is found out, which is of great guiding significance for reducing the operating cost of the cryogenic unit and increasing the yield of light hydrocarbons. In this paper, the HYSYS simulation software is used to simulate and optimize the deep cooling unit of natural gas. On the basis of the material balance calculation of the unit, the production and operation status of the decarbonizing tower, the moving equipment and the heat exchanger are calculated. This paper analyzes the main problems existing in the existing equipment and puts forward the corresponding suggestions for improvement. The results show that: (1) when the processing capacity is 24145.85Nm3/h (the design capacity is 25000Nm3/h), the operation parameters of the unit are stable, the recovery rate of light hydrocarbon is 28.1%, which is lower than the designed value of 33.3%, while the recovery rate of dry gas is 62.6%. It is higher than the designed value of 60.5%. The yield of ethane and the molar ratio of C1/C2 to light hydrocarbon meet the design requirements. (2) the heat extracted from the bottom of the tower increases and the temperature of the bottom of the tower increases, and the relationship between the heat extracted from the bottom of the tower and the temperature of the bottom of the tower is linear. (3) with the decrease of tower top temperature, the light hydrocarbon yield of Wanfang gas increases; When the top temperature of the tower is reduced from-70 鈩，

本文編號(hào)：2453826