摘要
目前 ,化石燃料燃烧过程的CO2 捕集技术主要包括燃烧后吸收、燃烧前脱碳和纯氧燃烧技术三种 .然而 ,这些技术因为成本比较高、工艺复杂等原因 ,仍未得到广泛的应用 .笔者提出了一种新型的燃烧技术———熔融盐循环热载体无烟燃烧技术 .该技术把一个燃烧过程分为氧化剂生成和燃料燃烧两个步骤进行 .第一步 ,氧气与氮气实现分离 ,得到高纯度的氮气 ;第二步 ,燃料与第一步生成的氧化物发生反应放出热 ,同时生成CO2 和水蒸气 ,CO2 很容易和水蒸气发生分离而被回收 .理论上讲 ,整个燃烧过程不向环境中排放CO2 ,NOx 和SO2 等有害气体 .金属氧化物分散在熔融盐中充当氧载体 ,燃烧过程在熔融盐体系中进行 .笔者以Li2 CO3+K2 CO3+Na2 SO4作为熔融盐体系 ,CH4作为燃料 ,CuO用作氧载体这一个典型的无烟燃烧体系进行了实验研究 .结果表明 ,燃烧过程可以按照理论分析的过程进行 ,燃烧放出热能的同时得到了纯度为 77.0 %～ 95 .0 %的CO2 和 91 .9%～ 99.3%的N2 .这样高纯度的CO2 有利于进一步捕集和储存 ,因此 。
At present, CO 2 capture technologies mainly include post-combustion scrubbing, pre-combustion decarbonization and oxyfuel. However, these technologies have not still been widely used in industry due to their higher cost and complicated technological process. In the authors' institute, a new type of nonflame combustion technology using thermal cyclic carrier of molten salt is developed, in which a whole combustion is divided into two steps, i.e. the section of producing oxide and the section of combustion. In the first step, oxygen is separated form air, and pure N 2 is simultaneously formed which is recovered. In the other step, fuels react with oxides formed in the first step, and at the same time, thermal energy, CO 2 and H 2O are produced. It is noted that the CO 2 is easily separated form water vaporization and captured. Theoretically, there are not environmental-unfriendly gases such as CO 2, NO x and SO 2 discharged in the whole combustion process. It is worth to point out that some metal oxides scattered into molten salts play the role of oxygen carriers in the combustion system. A typical nonflame combustion system using Li 2CO 3+K 2CO 3+Na 2SO 4 as molten salt system, CH 4 as fuel, CuO as catalyst is experimentally investigated. Experimental results show that the combustion process proceed as theoretically analysis, and high concentration CO 2 of 77.0%～95.0% and N 2 of 91.9%～99.3% are obtained. The high concentration of CO 2 is favorable to subsequently capture and store. Therefore, the potential of reducing CO 2 emissions of this nonflame combustion technology is huge.
出处
《昆明理工大学学报（理工版）》
2004年第4期43-49,共7页
Journal of Kunming University of Science and Technology(Natural Science Edition)
基金
SupportedbytheNationalNaturalScienceFoundationofChina ( 5 0 16 4 0 02)andScience&TechnologyFoundationofBaoshanIronandSteelCo .Ltd .
关键词
温室气体排放
无烟燃烧技术
熔融盐
greenhouse gas emission
nonflame combustion technology
molten salt
