分子篩特殊再生方案.doc

Yulin TSA INITIAL CONDITIONING PROCEDUREPurposeThe TSAs contain a layer of CaX material to remove CO2 and N2O. Water typically does not contact this layer. But under some plant upsets maintenance, orduring loading of sieve; water may reach this material. As the residual water content on the CaX increases, its capacity for CO2 and N2O decreases, which can lead to premature break through (i.e. shorter on-stream times). Normal regeneration temperatures are not high enough to completely remove water from the CaX material, so high temperature regeneration is required. This procedure describes the steps for the initial regeneration of the TSA.ScopeThis procedure assumes the ASU has been isolated and secured, such that it is safe to operate the main air compressor, DCAC, and the TSA.Warnings/Notes The high temperature regeneration causes a few situations that must be monitored closely. The TSA regeneration circuit isnt designed for high temperature and pressure. The regeneration circuit pressure must operate 0.5 bar g The temperature to the main exchanger 50 ppm CO2) onto a hot bed could cause some damage to the sieve. In order to achieve the desired effect, the total heat time for each adsorber vessel must be 12 hours with regeneration flow conditions of 14500 Nm3/hr at 300 C regen inlet temp. Assume heater outlet temp is 330 C to account for piping heat leak. The on-line time for the adsorber is about 30 hours at 33 C air inlet temperature and 15000 Nm3/hr of air flow. TSA on line time for adsorber can be increased if air temperature is lower. At 15000 nm3/h bootstrap flow, 28 C and 5 barg inlet conditions, the on stream time is approx 38 hours. The steam and electric heaters must be run to achieve the 330 C regeneration temperature. During regen, air flow to the on stream adsorber should be limited to the adsorber regeneration flow of 14500 Nm3/hr to minimize on stream adsorber water load and maximize on stream time.Procedure1. Start the MAC, Front end system. 主壓縮機，空冷塔和TSA正常運轉。2. Override the “TSA cycle incomplete” trip. 旁路“TSA cycle incomplete” 停車功能。3. Once TSA started, 2 beds should run 1 normal cycle first to achieve a peak temperature of at least 100C exiting the bed being regenerated, the cycle time, heating time & heating temperature, regen flow shall follow the design values, during initial conditioning, need ensure IA from backup system, not from TSA. 分子篩啟動的第一個循環(huán)應該是正常運行去獲得一個最低100攝氏度的床出口再生溫度，運行的周期時間，加熱時間，加熱溫度，再生氣流量均應保持與設計一致, 在特殊再生期間，工廠儀表氣應由備用系統(tǒng)提供，不要由TSA供給。4. Override the trim heater high outlet temperature trip. 旁路電加熱器出口溫度高停車功能。5. Allow the TSA sequence to reach a heating step on one of beds, adjust V1827 to control the regen flow reach 14700 Nm3/h, the flow must over 13700Nm3/h, increase the trim heater temperature TIC-1826 to the lower of 260C, once 260C is attained, increase the set point by 10C every 2 minutes until 330C attained, closely to monitor the trim heater shell temperature, do not allow the shell temperature to reach a temperature within 10C of its trip point. 當分子篩運行到加熱步驟時，調(diào)整V1827的開度，再生氣流量達到14700Nm3/h, 應確保不能低于13700Nm3/h, 調(diào)整TIC-1806的設定值低于260攝氏度，當溫度到達260度時，再每2分鐘上調(diào)設定值10度直到到達330度，注意觀察電加熱器外殼溫度，溫度應低于停車值10度。6. Switch the sequence to manual with one bed online and the other in heating step, keep the total heating time over 12 hours then step advance to the cooling step.將TSA順序控制設為手動當床進入加熱步驟時，并保持這個床加熱時間超過12小時以上然后用步進器手動進入冷吹步驟。7. Keep sequence in manual an cool the bed until the regen out and bed inlet temperatures are within 15 C of each other, the time should be around 7 hours.保持冷吹步驟手動大約7個小時直到冷吹床出口和另一個在線吸附床入口的溫度差在15度以內(nèi)。8. Step advance to the repressurisation step and return the sequence to auto, allow the sequence to proceed in auto until the next heating step is reached.將步進器手動進入再加壓步驟后將TSA順序控制器設定為自動，讓TSA自動運行直到下一個床加熱步驟。9. Repeat steps 5 through to step 8 for the other bed.重復步驟5到8，進行另一個床的烘烤。10. Return the sequence to auto, set the regen flow, heater outlet temperature back to design values, remove the the overrides put on in steps 2 & 4.將TSA順序控制器設定為自動。江再生氣流量，加熱溫度改為設計值，取消在第二步和第四步的停車旁路。Conditioning is now complete，the TSA beds have been conditioned to achieve at least the expected pe