Experimental study on cogasification mechanisms of straw and kitchen waste in the fixed‐bed gasifier. (22nd May 2020)

• Record Type: Journal Article
• Authors: Qi, Yongfeng; Shan, Xiaowei; Wang, Meiting; Zhao, Lingzhi; Ge, Panle; Wu, Jiang
• Is Part Of: International journal of energy research. Volume 44:Number 11(2020)
• Page Start: 8578
• Page End: 8590
• Publication Date: 2020-05-22
• Subjects: cooperative gasification -- function group -- kitchen waste -- straw -- trench oil; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Power resources -- Research -- Periodicals; 621.042
• DOI: 10.1002/er.5545
• Languages: English
• ISSNs: 0363-907X

Abstract

Summary: The cogasification experiments were carried out by an electric fixed‐bed gasifier to explore the cooperative gasification mechanisms of straw and kitchen waste. The effects of temperature, equivalence ratio as well as mixing ratio of straw and kitchen waste containing rice and trench oil on the gasification behaviors were investigated, combining the characterizations with SEM and FTIR. The results showed that the CH4 release volume fraction of single trench oil could up to 90%, as for the mixtures of straw, rice, and trench oil, the rapid reaction of oil could increase the gasification temperature, promote the bond fractures of CC and CH. Thereby those fractured matters could combine CO and H2 to generate CH4, which consequently improved the gas quality from straw gasification. As the equivalence ratio being 0.1 at 800°C, the actual calorific value of released gaseous from the mixture of straw, rice, and oil was at least 26% higher than the theoretical weighting value. When the mass ratio of straw, oil, and rice was 2:0.5:0.5, that superiority even reached 49.31%. Furthermore, in another fixed‐bed gasifier without external heating, the mixture of sun‐dried straw and actual kitchen waste containing much water could still achieve continuous gasification, and the experimental phenomena were similar to those above with the electric fixed‐bed gasifier. The real calorific value of the mixture of straw and kitchen waste was still higher than the theoretical weighting value. Abstract : The co‐gasification mechanisms of straw and kitchen waste were investigated by the electric heating reactor and the self‐heating gasifier, and with the effects of temperature, equivalence ratio, as well as mixing ratio of straw and kitchen waste considered. The co‐gasification could achieve much higher heat value than the weighting value from the single material gasification even without external heating, and the added kitchen waste into the straw increased the gasification temperature and promoted the breakage of functional groups. HIGHLIGHTS: Four main highlights of this manuscript are as follows: First, the cooperative gasification mechanisms of straw and kitchen waste were investigated with not only the electric heating reactor but also the self‐heating gasifier. Second, the cogasification could achieve much higher heat value than the weighting value from the single material gasification even without external heating. Third, the added kitchen waste increased the reaction temperature of gasification and promoted the breakage of function groups. Lastly, the mixture of preliminary dried straw and actual kitchen waste with more water could still achieve continuous gasification without external heating.