【摘要】：因排放量巨大,二氧化碳被認(rèn)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(jīng)成為中國(guó)乃至世界各國(guó)共同面臨的挑戰(zhàn),同時(shí)也成了各領(lǐng)域研究者共同關(guān)注的焦點(diǎn)。近年來(lái),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(jī)胺引起了很多研究者的興趣。目前,已經(jīng)有一些公開的文獻(xiàn)報(bào)道了這四種有機(jī)胺在吸收C02方面的一些應(yīng)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(jìn)行C02吸收的實(shí)驗(yàn),并分別考察了添加劑PZ和AEPZ濃度、液體流量、氣體流量、進(jìn)口CO2濃度以及吸收劑溫度對(duì)CO2脫除率的影響。實(shí)驗(yàn)結(jié)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(shí)驗(yàn)的基礎(chǔ)上,以25% DETA+5% PZ為主要吸收劑,在旋轉(zhuǎn)填充床中進(jìn)行了CO2吸收的實(shí)驗(yàn),并考察了轉(zhuǎn)子轉(zhuǎn)速、PZ濃度、液體流量、氣體流量、氣體停留時(shí)間、進(jìn)口C02濃度以及溫度對(duì)CO2脫除率和KCa的影響。研究結(jié)果表明轉(zhuǎn)子轉(zhuǎn)速、液體流量、氣體流量和氣體停留時(shí)間、溫度對(duì)CO2脫除率和KGa影響較大,而PZ濃度和進(jìn)口C02濃度的影響則相對(duì)較低。本文得出的較適宜的操作條件為：轉(zhuǎn)子轉(zhuǎn)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(dāng)氣體流量為2.0 m3·h-1時(shí),C02脫除率可達(dá)90%以上;同時(shí),依據(jù)實(shí)驗(yàn)數(shù)據(jù)擬合出了KGa的實(shí)驗(yàn)關(guān)聯(lián)式,結(jié)果顯示絕大多數(shù)KGa計(jì)算值和實(shí)驗(yàn)值的誤差在±20%以內(nèi),可以較好地預(yù)測(cè)實(shí)驗(yàn)結(jié)果。另外,通過旋轉(zhuǎn)填充床和填料塔的實(shí)驗(yàn)結(jié)果的對(duì)比,可以看出,在相似操作條件下,旋轉(zhuǎn)填充床在C02吸收方面更具優(yōu)勢(shì)。
[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(hào)：2429171