分子筛特殊再生方案.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. 主压缩机，空冷塔和TSA正常运转。2. Override the “TSA cycle incomplete” trip. 旁路“TSA cycle incomplete” 停车功能。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. 分子筛启动的第一个循环应该是正常运行去获得一个最低100摄氏度的床出口再生温度，运行的周期时间，加热时间，加热温度，再生气流量均应保持与设计一致, 在特殊再生期间，工厂仪表气应由备用系统提供，不要由TSA供给。4. Override the trim heater high outlet temperature trip. 旁路电加热器出口温度高停车功能。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. 当分子筛运行到加热步骤时，调整V1827的开度，再生气流量达到14700Nm3/h, 应确保不能低于13700Nm3/h, 调整TIC-1806的设定值低于260摄氏度，当温度到达260度时，再每2分钟上调设定值10度直到到达330度，注意观察电加热器外壳温度，温度应低于停车值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.将TSA顺序控制设为手动当床进入加热步骤时，并保持这个床加热时间超过12小时以上然后用步进器手动进入冷吹步骤。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.保持冷吹步骤手动大约7个小时直到冷吹床出口和另一个在线吸附床入口的温度差在15度以内。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.将步进器手动进入再加压步骤后将TSA顺序控制器设定为自动，让TSA自动运行直到下一个床加热步骤。9. Repeat steps 5 through to step 8 for the other bed.重复步骤5到8，进行另一个床的烘烤。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.将TSA顺序控制器设定为自动。江再生气流量，加热温度改为设计值，取消在第二步和第四步的停车旁路。Conditioning is now complete，the TSA beds have been conditioned to achieve at least the expected pe