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A portion of the reactor effluent leaving the Ethanol Dehydration Reactor Feed/Effluent Exchanger is used in the Stripping Column Reboiler, E-3310 (Dwg. 5248-X-103A), to reboil the bottoms of the Stripping Column, T-3310 (Dwg. 5248-X-103A). The remainder of the reactor effluent is sent to the Ethanol Feed Vaporizer where it is cooled to 118°C. The ethylene-steam mixture from the Ethanol Feed Vaporizer is mixed with flash vapor from the Dehydration Excess Steam Condensate Drum, V-31230, and with vapor from Stripping Column Reboiler Condensate Drum, V-3310 (Dwg. 5248-X-103A). This combined vapor stream is fed to the Dehydration Excess Steam Condenser, E-31230, where it is cooled to 60°C.The ethylene-rich vapor from the Dehydration Excess Steam Condenser is sent to the Ethylene Compressors, C-3310A/B (Dwg.5248-X-103B).

離開乙醇脫水反應(yīng)器進(jìn)料/出料換熱器的一部分反應(yīng)器流出物被用于汽提塔再沸器內(nèi)（E-3310，圖號5248 – X- 103A），使汽提塔（T-3310，圖號5248-X-103A）底部再沸騰。其余反應(yīng)器流出物被送至乙醇進(jìn)料汽化器，在此被冷卻至118°C。來自乙醇進(jìn)料汽化器的乙烯蒸汽混合物與來自脫水過剩蒸汽冷凝液罐（V-31230）的閃變水汽及來自汽提塔再沸器冷凝液罐（V-3310，圖號5248 -X-103A）的蒸汽相混合。這種混合蒸汽流被送至脫水過剩蒸汽冷凝器（E-31230）內(nèi)，在此被冷卻至60°C。來自脫水過剩凝汽器的富乙烯水汽被送至乙烯壓縮機(jī)（C – 3310A/B，圖號5248 -X-103B）。

In the case of the cycle gas differential flow alarm, the alarm point will automatically increase at its fixed ratio below the process flow as the process flow is increased. However, the alarm point will not decrease when the process flow is decreased unless the “reset” push-button for the alarm is pressed. Failure to reset the alarm point when reducing the process flow could result in a shutdown because the alarm point would remain at a value equal to the set ratio below the maximum process flow which has been obtained. Consequently, when deliberately reducing cycle gas, the “reset” push-button should be pressed and held until the new process flow has stabilized. The alarm point tracks the process flow while the push-button is pressed. Upon release of the “reset” push-button, the alarm point is reset to the fixed ratio below the new lower process flow.

在循環(huán)氣體流量差報警的情況下，隨著工藝流程的增加，報警點會按照工藝流程以下的固定比例而自動增加。但當(dāng)工藝流程降低時，報警點將不會減少，除非按下報警用的“復(fù)位”按鍵。工藝流程降低時，未復(fù)位報警點可能會導(dǎo)致停機(jī)，因為報警點將保持在一個與低于已經(jīng)獲得的最大工藝流程的設(shè)定比例相當(dāng)?shù)闹瞪?。因此，?dāng)故意減少循環(huán)氣時，應(yīng)按下“復(fù)位”按鍵按下并保持直至新的工藝流程已趨于穩(wěn)定。當(dāng)按下按鍵時，該報警點會跟蹤工藝流程。一旦松開“復(fù)位”按鍵，報警點將被復(fù)位至低于新的較低工藝流程的固定比例。

The Purification Column is provided with tandem safety valves which provide pressure relief for the entire Ethylene Oxide Purification Section. The design pressure is set significantly higher than the normal operating pressure to minimize the possibility of an accidental EO release. Redundant high-pressure interlocks cut off feeds to the EO Reaction Section and all heat sources to the Ethylene Oxide Purification Section far below the relieving pressure. Rupture discs with “tell-tale” pressure switches are provided for EO service relief valves to eliminate fugitive emissions. The temperature level of all concentrated EO heating media is limited to assure that the temperature of all surfaces in contact with concentrated EO vapor is kept well below the established safety limits.

凈化塔配備有串聯(lián)安全閥，為整個環(huán)氧乙烷凈化工段卸壓。設(shè)計壓力被設(shè)定為大大高于普通工作壓力，以將發(fā)生環(huán)氧乙烷泄漏事故的可能性降至最低。冗余高壓連鎖切斷了向環(huán)氧乙烷反應(yīng)工段的供料，以及供至遠(yuǎn)低于泄放壓力的環(huán)氧乙烷凈化工段的所有熱源。環(huán)氧乙烷服務(wù)安全閥配備有帶“指示器”壓力開關(guān)的破裂片，以消除無組織排放。需要對所有濃縮環(huán)氧乙烷加熱介質(zhì)的溫度范圍進(jìn)行限制，以確保與濃縮環(huán)氧乙烷蒸汽接觸的所有表面溫度被控制在規(guī)定的安全范圍以下。

Start Evaporator bottoms flow and slowly increase to 1.7 times the estimated EO content of the Glycol Reactor feed. Make small (1%) changes in bottoms flow to obtain a stable Evaporator bottoms temperature of 182 to 186°C. Do not put the steam flow controller in cascade with the temperature at this time. As the EO production increases the bottoms flow must be increased proportionately. Make small changes to the steam flow controller in an effort to stabilize the trend of the Evaporator bottoms level.

開啟蒸發(fā)器底流，慢慢將其增至乙二醇反應(yīng)器進(jìn)料中預(yù)計環(huán)氧乙烷濃度的1.7倍。對底流做一些細(xì)微（1%）調(diào)整，以便獲得一個穩(wěn)定的蒸發(fā)器底層溫度——182°C到186°C之間。此時，請勿將蒸汽流控制器與溫度串聯(lián)。由于環(huán)氧乙烷生產(chǎn)增加，底流也必須成比例增加。對蒸汽流控制器做一些細(xì)微的調(diào)整，以穩(wěn)定蒸發(fā)器底部水位的趨勢。

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