电厂烟道气CO2变温吸附捕集工艺设计及经济评价

摘要

A fixed-bed temperature swing adsorption process with the CO2capture capacity of 20 kt/a was designed for coal-fired power plant flue gas based on a PEHA type(R1HMS3-PEHA80) amine-based adsorbent. Economic evaluation on the designed process was carried out by calculating the investment cost and the operating cost,and studing the influence of various performance parameters and effective capture capability of the adsorbent on the economic performance and energy consumption was made. The experimental results indicated that the total regeneration energy consumption and the capture cost of the process were 2.26 GJ/t and 341.0 Yuan/t(based on the amount of CO2captured),respectively,which were reduced by 30.7% and by 13.5% in contrast with the amine solution absorption method;the operating cost was a major part of the total capture cost,which was in a proportion of as high as 91.2%;and the steam consumption accounted for the largest operating cost(66.2%). The parameter analysis results showed that the adsorption heat of the adsorbent affected the regeneration energy consumption most and both the effective capture capability and the adsorption heat had the greatest influence on the capture cost.%针对燃煤电厂烟道气,以PEHA型(R1HMS3-PEHA80)胺基吸附剂为基础,设计了一套CO2捕集量为20 kt/a的固定床变温吸附工艺,通过投资成本和运行成本的计算对设计的工艺进行了经济性评价,并研究了吸附剂各性能参数和有效捕集能力对再生能耗和捕集成本的影响.实验结果表明,工艺总再生能耗为2.26 GJ/t(基于CO2捕集量),比胺溶液吸收法再生能耗降低了30.7%;捕集成本为341.0 元/t(基于CO2捕集量),比胺溶液吸收法降低了13.5%;在工艺总捕集成本中,运行成本是主要组成部分,所占比例高达91.2%;在运行成本中,蒸汽成本所占比例为66.2%,是工艺运行中的最大消耗.参数分析结果显示,吸附剂的吸附热对再生能耗的影响最大;有效捕集能力和吸附热对捕集成本的影响最大.