AEP-DPA-CuO相变纳米流体吸收CO_(2)稳定性

Study of CO_(2) absorption stability of AEP-DPA-CuO phase change nanofluids

化学吸收法CO_(2)捕集技术的核心是吸收剂,吸收剂的稳定性是实现CO_(2)捕集装置长周期连续运行的关键。本文针对0.6mol/L AEP-0.4mol/L DPA-0.1mol/L ACT相变有机胺吸收体系高温、含氧等条件下降解会带来腐蚀增强、吸收剂损耗的技术难题,进行了降解组分分析,研究了降解的主要影响因素。研究发现,CO_(2)负载、O_(2)、温度对降解率均有较大影响,其中影响因素排序为CO_(2)>O_(2)>温度,Fe对氧化降解影响大于对热降解的影响。通过GC-MS分析可知,热降解热稳定盐主要有3种,氧化降解热稳定盐主要有6种。为抑制热降解与氧化降解,研究选取酒石酸钾钠等6种抗氧化剂进行考察,得到最佳抗氧化剂为丙酮肟,最佳添加量为800mg/L,其中热降解抑制率为97.9%,氧化降解抑制率达到98.3%,实现了AEP-DPA-ACT相变体系的低降解率,为相变纳米流体的稳定运行提供了保障。

The core of CO_(2)capture technology by chemical absorption method is absorbent, and the stability of absorbent is the key to realize the long-term continuous operation of CO_(2)capture device. The degradation of 0.6mol/L AEP-0.4mol/L DPA-0.1mol/L ACT phase change organic amine absorption system under high temperature and oxygen-containing conditions leads to the technical problems of corrosion enhancement and absorbent loss. The degradation components were analyzed and the main influencing factors were studied. It was found that CO_(2)loading, Oand temperature had great influence on the degradation rate, and the order of influencing factors was: CO_(2)>O_(2)>temperature. Fehad greater influence on oxidative degradation than on thermal degradation. By GC-MS analysis, there were three kinds of thermally stable salts in thermal degradation and six kinds of thermally stable salts in oxidative degradation. To inhibit thermal degradation and oxidative degradation, six kinds of antioxidants, such as potassium sodium tartrate, were selected for investigation. The results showed that the best antioxidant was acetone oxime, and the best dosage was 800mg/L, in which the thermal degradation inhibition rate was 97.9%, and the oxidative degradation inhibition rate was 98.3%. The low degradation rate of AEP-DPA-ACT phase change system was realized, which provided a guarantee for the stable operation of phase change nanofluids.