沥滤预处理的棉秆-高灰煤共气化特性研究

Study on the co-gasification characteristics of cotton stalks and high-ash coal by leaching pretreatment

中文关键词: 沥滤  棉秆  高灰煤  共气化  交叉组合

英文关键词: leaching  cotton stalk  high-ash coal  co-gasification  cross combination

中文摘要:

      生物质与煤的固在碱金属是生物质与煤炭共气化过程中的重要影响因素。本研究以含不同形态的碱金属的棉秆（CS）和高灰煤（HAC）为研究对象，采用自制的固定床研究其共气化过程中的气体产量与主要组分变化规律以及两者之间的相互作用，以揭示两种原料中不同形态的碱金属对共气化的影响。结果表明：随着沥滤脱灰程度的提高，棉秆与高灰煤的产气量得到不同程度的提高。对棉秆与高灰煤交叉组合共气化，发现棉秆气化在共气化过程中起到主导作用。原样棉秆与高灰煤共气化协同效应系数最高，为1.15，水沥滤秸秆与水沥滤煤的共气化产气量最高，为1428 mL·g-1。酸沥滤后的棉秆对共气化气体组分有较大的影响，表现为H2与CO2组分的降低，CO与CH4组分的升高。

英文摘要:

      The inherent alkali metals of biomass and coal are important factors during co-gasification. In this study, two materials containing different forms of alkali metals, cotton stalk (CS) and high ash coal (HAC), were used as the research objects. In the co-gasification process, the self-made fixed bed was used to study the gas production and the change of main components and interaction between CS and HAC, revealing the influence of different forms of alkali metals in the two raw materials on co-gasification. The results show that with the increase of the degree of leaching and deashing, the gas production of CS and HAC has been increased to varying degrees. For the cross-combination co-gasification of CS and HAC, found that CS gasification played a leading role in the CS-HAC co-gasification process. The co-gasification of raw-CS and raw-HAC had the highest synergy coefficient, which was 1.15. The co-gasification of water-leached CS and water-leashed HAC produced the highest gas production, which was 1428 mL·g-1. The acid-leached CS has a greater impact on the co-gasification gas composition, which is manifested by the de-crease of H2 and CO2 components, and the increase of CO and CH4 components.