Effect of cyclic adsorption performance of calcium-based sorbent on enhanced biomass gasification for hydrogen production

LI Yang; ZHANG Yang; CHEN Xuanlong; GONG Xun

doi:10.11949/0438-1157.20190782

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Effect of cyclic adsorption performance of calcium-based sorbent on enhanced biomass gasification for hydrogen production

Energy and environmental engineering | 更新时间：2026-07-24

- Effect of cyclic adsorption performance of calcium-based sorbent on enhanced biomass gasification for hydrogen production
- CIESC Journal Vol. 71, Issue 2, Pages: 777-787(2020)
- 作者机构：
  
  华中科技大学煤燃烧国家重点实验室，湖北武汉 430074
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20190782
  CLC： TQ 424.24
- Received：09 July 2019，
  
  Revised：2019-12-05，
  
  Online First：14 August 2020，
  
  Published：05 February 2020
- 稿件说明：
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李扬, 张扬, 陈宣龙, 龚勋. 钙基吸附剂循环吸附性能对增强式生物质气化制氢的影响研究[J]. 化工学报, 2020, 71(2): 777-787

LI Yang, ZHANG Yang, CHEN Xuanlong, GONG Xun. Effect of cyclic adsorption performance of calcium-based sorbent on enhanced biomass gasification for hydrogen production[J]. CIESC Journal, 2020, 71(2): 777-787
李扬, 张扬, 陈宣龙, 龚勋. 钙基吸附剂循环吸附性能对增强式生物质气化制氢的影响研究[J]. 化工学报, 2020, 71(2): 777-787 DOI： 10.11949/0438-1157.20190782.

LI Yang, ZHANG Yang, CHEN Xuanlong, GONG Xun. Effect of cyclic adsorption performance of calcium-based sorbent on enhanced biomass gasification for hydrogen production[J]. CIESC Journal, 2020, 71(2): 777-787 DOI： 10.11949/0438-1157.20190782.

摘要

钙基吸附剂循环CO

吸附性能对增强式生物质气化连续高效制氢起重要作用。采用将CaO颗粒分散在惰性载体中的方法并结合挤压成型技术制备了合成吸附剂颗粒。为了筛选循环吸附性能较好的吸附剂，在热重分析仪上进行了循环吸附性能测试。基于热重测试结果开展了吸附剂循环利用条件下的增强式生物质气化制氢实验。结果表明：添加惰性载体能延缓CaO烧结，提高吸附剂的循环吸附能力；挤压成型过程会破坏吸附剂原有孔隙结构，导致吸附剂颗粒吸附性能不同程度降低，其中CaSi75p、CaAl75p和CaY75p三种吸附剂循环性能较好；添加以上三种吸附剂颗粒均可显著提高生物质气化合成气中H

浓度及产率，5次循环过程中气体成分和产率变化不大，表明吸附剂循环吸附能力和稳定性较好。

Abstract

The CO

adsorption performance of the calcium-based adsorbent cycle plays an important role in continuous and efficient hydrogen production from enhanced biomass gasification. Six kinds of synthetic adsorbent powders (CaMg75

CaAl75

CaLa75

CaY75

CaNd75 and CaSi75) and six kinds of synthetic adsorbent particles (CaMg75p

CaAl75p

CaLa75p

CaY75p

CaNd75p and CaSi75p) were prepared by adding different inert carriers into CaO particles and extrusion-spheronization process

wherein the mass fraction of CaO were 75%. Meanwhile

calcium oxide powder (CaO) obtained by calcination of calcium carbonate and its corresponding cal

cium oxide particles (CaOp) were prepared. The above seven kinds of powders were tested by X-ray diffraction (XRD). Seven kinds of adsorbent powders and seven kinds of particles were tested by specific surface area and pore size tester. Thermogravimetric analysis (TG) was used to test the carbonation-calcination cycle of the above seven adsorbent powders and their corresponding adsorbent particles. Based on the thermogravimetric test results

the enhanced biomass gasification experiment for hydrogen production under the condition of adsorbent recycling was carried out with smoke bars as the original biomass. The results show that there are MgO

and Ca

SiO

inert carriers in the powders of the six synthetic adsorbents. The inert carriers can not react with CO

but also disperse CaO grains. The thermal stability is good. The sintering of the adsorbents can be delayed and the adsorptive performance of the adsorbents can be improved. They have good thermal stability and they can delay the sintering of adsorbent to improve the adsorptive performance of adsorbent. The extrusion-spheronization process destroys the original pore structure of the adsorbent

and the specific surface area of spherical particles of synthetic CaO adsorbent is lower than that of the same kind of powder

which leads to the decrease of adsorptive performance of adsorbent particles. With the increase of thermogravimetric cycles

the adsorption capacity of CO

and conversion rate of CaO of adsorbents CaAl75p

CaY75p and CaSi75p in 25 cycles decreased gradually. However

the adsorption capacity of CO

is always above 0.15 g CO

/g biomass

and the conversion rate of CaO is always above 30% respectively. Both data are much higher than that of CaOp

indicating that three adsorbents

CaSi75p

CaAl75p and CaY75p

have better cycling performance. In the enhanced

biomass gasification hydrogen production cycle experiment

the volume fraction of H

increases significantly after adding the above three adsorbent particles in five cycles

and the concentration of H

increases from 46.2% to more than 60%. Addition of CaAl75p

CaY75p and CaSi75p could significantly increase concentration and yield of H

in biomass gasification synthesis gas. The composition and yield of the gas change little during the five cycles

indicating that three kinds of adsorbents have good cyclic adsorption capacity and stability.

关键词

Keywords

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