FCC再生烟气中CO_2捕集技术的试验研究

RESEARCH ON CO_2CAPTURE FROM FCC REGENERATION FLUE GAS

根据FCC再生烟气特点，应用化学吸收法对烟气中CO2进行捕集。在2m3／h烟气中CO2捕集试验装置上对烟气中CO2捕集技术进行试验研究，结果表明，FCC再生烟气中CO2捕集的适宜工艺条件为：吸收剂质量分数15％～30％，吸收温度60～70℃，解吸温度90～120℃，气液体积比100～250，吸收液为全回流状态。在上述条件下，采用开发的新型吸收剂CHA，烟气中CO2的捕集率达95％，解吸率达80％。与单乙醇胺吸收剂（MEA）相比，CHA的吸收速率相当，解吸能耗低，对设备的腐蚀性小，腐蚀速率仅为0．0136mm／a，同样条件下MEA的腐蚀速率为0．0325mm／a。烟气中的SOz对COz的捕集效果影响较大，在CO2捕集前应先脱除。

The CO2 capture test was conducted in a flue gas device with 2 ma/h capacity by chemical absorption. The results show that the suitable process conditions are.. absorbent 15%--30%, absorption temperature 60--70 ℃, desorption temperature 90--120 ℃, gas-liquid ratio of 100--250 and total reflux mode of absorbing liquid. The capture rate of CO2 is 95%, and desorption rate reaches 80% using a new developed absorbent CHA. The absorption rate of the CHA is equivalent to that of ethanolamine （MEA） and the energy consumption and the corrosion to equipment are less than MEA. The rate of corrosion of CHA is only 0. 013 6 mm/a, while the rate of MEA is 0. 032 5 mm/a. The SO2 in flue gas has an important influence on CO2 capture and should be removed in advance.