【摘要】：因排放量巨大,二氧化碳被認為是造成全球變暖的主要溫室氣體,如何降低CO2排放量從而抑制全球變暖已經成為中國乃至世界各國共同面臨的挑戰(zhàn),同時也成了各領域研究者共同關注的焦點。近年來,PZ(哌嗪)、AEPZ(氨乙基哌嗪)、DETA(二乙烯三胺)和TETA(三乙烯四胺),這四種具有高吸收速率的有機胺引起了很多研究者的興趣。目前,已經有一些公開的文獻報道了這四種有機胺在吸收C02方面的一些應用。本文中,首先選擇了四種總濃度為30wt%的吸收劑：DETA+PZ, DETA+AEPZ,TETA+PZ和TETA+AEPZ,在填料塔中進行C02吸收的實驗,并分別考察了添加劑PZ和AEPZ濃度、液體流量、氣體流量、進口CO2濃度以及吸收劑溫度對CO2脫除率的影響。實驗結果表明,相比單一的DETA或TETA溶液,添加一定量的PZ或AEPZ能提高C02脫除率,但是添加過量的AEPZ效果則相反。四種吸收溶液中,DETA+PZ的脫碳效果最好,而TETA+AEPZ的脫碳效果最差。在填料塔實驗的基礎上,以25% DETA+5% PZ為主要吸收劑,在旋轉填充床中進行了CO2吸收的實驗,并考察了轉子轉速、PZ濃度、液體流量、氣體流量、氣體停留時間、進口C02濃度以及溫度對CO2脫除率和KCa的影響。研究結果表明轉子轉速、液體流量、氣體流量和氣體停留時間、溫度對CO2脫除率和KGa影響較大,而PZ濃度和進口C02濃度的影響則相對較低。本文得出的較適宜的操作條件為：轉子轉速為1000-1200 rpm,液體流量為11 L·h-1,PZ濃度為5%以及溫度為40-50℃,在此條件下,當氣體流量為2.0 m3·h-1時,C02脫除率可達90%以上;同時,依據(jù)實驗數(shù)據(jù)擬合出了KGa的實驗關聯(lián)式,結果顯示絕大多數(shù)KGa計算值和實驗值的誤差在±20%以內,可以較好地預測實驗結果。另外,通過旋轉填充床和填料塔的實驗結果的對比,可以看出,在相似操作條件下,旋轉填充床在C02吸收方面更具優(yōu)勢。
[Abstract]:Because of the huge emissions, carbon dioxide is considered to be the main greenhouse gas causing global warming. How to reduce the CO2 emissions to curb global warming has become a common challenge for China and the world. At the same time, it has also become the focus of attention of researchers in various fields. In recent years, PZ (piperazine), AEPZ (aminoethylpiperazine (), DETA (diethylenetriamine) and TETA (triethylenetetramine), four organic amines with high absorption rate, have attracted many researchers' interest. The applications of these four organic amines in the absorption of CO2 have been reported in some public literatures. In this paper, four kinds of absorbent: DETA PZ, DETA AEPZ,TETA PZ and TETA AEPZ, with total concentration of 30 wt% were selected for CO2 absorption in packed column, and the concentration of PZ and AEPZ, the flow rate of liquid and the flow rate of gas were investigated, respectively. The influence of CO2 concentration and absorbent temperature on the removal rate of CO2. The experimental results show that compared with a single DETA or TETA solution, adding a certain amount of PZ or AEPZ can increase the removal rate of CO2, but the effect of adding too much AEPZ is opposite. The decarburization effect of, DETA PZ is the best and that of TETA AEPZ is the worst. On the basis of packed column experiment, using 25% DETA 5% PZ as the main absorbent, the experiment of CO2 absorption in rotating packed bed was carried out, and the rotor speed, PZ concentration, liquid flow rate and gas residence time were investigated. Effects of inlet CO2 concentration and temperature on CO2 removal rate and KCa. The results show that rotor speed, liquid flow rate, gas residence time and temperature have great influence on CO2 removal rate and KGa, but the influence of PZ concentration and inlet CO2 concentration is relatively low. The optimum operating conditions are as follows: rotor speed is 1000-1200 rpm, liquid flow rate is 11L h-1PZ concentration 5% and temperature is 40-50 鈩，

本文編號：2429171