Thermal behavior of woody residues in a reduced‐oxygen atmosphere using Macro‐thermogravimetric technique

Abstract

In the context of sustainable development, co‐gasification or co‐firing of biomass residues and coal is becoming a relevant solution to mitigate the negative impact of fossil fuels. For this reason, it is crucial to understand the characteristics, as well as the thermal behaviors of these residues, especially in a low‐oxygen condition that is often found in industrial processes. In this study, woody residues, namely bamboo and rubberwood chips that are abundantly available in Vietnam were characterized. Thermal degradation of these residues in 4 % oxygen was also conducted using a Macro‐thermogravimetric analyzer, from room temperature to 700 °C. The results showed that bamboo had a higher volatile matter and a higher hemicellulose content compared to rubberwood chips, hence is easier for ignition in a thermochemical conversion process. Regarding the thermal behaviors of these residues in a reduced‐oxygen condition, three stages could be clearly observed in the TGA‐DTG curves. Rubberwood chip had a higher ignition temperature and higher temperatures of maximum mass loss rate compared to bamboo chip. Results could contribute to the understanding of the thermal behaviors of these biomass feedstocks in order to improve the efficiency of co‐gasification or co‐firing processes.

Khí Hóa Vỏ Hạt Cà Phê Trong Môi Trường Liên Quan Đến Các Quy Trình Công Nghiệp

“…Hơn nữa, các hành vi nhiệt đo được bằng phương pháp phân tích nhiệt trọng -vi sai (TGA-DTG), chẳng hạn như nhiệt độ phân hủy ban đầu, nhiệt độ phân hủy tối đa, tốc độ phân hủy, v.v... là cần thiết cho việc thiết kế một hệ thống khí hóa hiệu quả [8]. Kỹ thuật TGA-DTG đã được sử dụng rộng rãi trong việc nghiên cứu các quá trình chuyển đổi nhiệt hóa như nhiệt phân và khí hóa [9], [10].…”

Investigation on gasification of coffee husk inCO2,H2O, and mixed atmospheres

“…[11] The TGA-DTG technique has been widely used in studying thermochemical conversion processes such as pyrolysis and gasification. [12][13][14] Several studies of the properties and thermal behaviors of coffee husk from Brazil, [15] Colombia, [16] Tanzania, [17] were investigated in the literature, but a high heterogeneity in the results. Additionally, the characteristics of biomass are based on their intrinsic nature, weather conditions, and field locations.…”