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193 results on '"Huang, Jingchun"'

45. In-depth study of the sulfur migration and transformation during hydrothermal carbonization of sewage sludge.

Author

Wang, Zhenqi, Huang, Jingchun, Hu, Wei, Xie, Di, Xu, Minghou, and Qiao, Yu

Abstract

This study investigated the effect of temperature on sulfur transformation behavior during the hydrothermal carbonization of raw sludge, water washed sludge and the corresponding filtrate solution at 110–235 °C. The different sulfur species in the various products were determined, primarily focusing on the sulfur species present in the aqueous product. At 110 °C, 31.9% of sulfur migrated to the aqueous product, primarily in the form of sulfone-S and sulfoxide-S. As the temperature increased to 160 °C, the hydrolysis of aliphatic-S and aromatic-S was enhanced, and the former species further transformed to other organic-S or SO 4 2-S in the aqueous product. High temperature is beneficial to the formation of sulfate-S and thiophene-S/aromatic-S in the aqueous and hydrochar products, along with the release of H 2 S and CH 3 SH. This caused a retention of only 29.2% sulfur (i.e., sulfate-S) in the hydrochar at 235 °C, with a large amount of sulfur migrating to the aqueous product (51.1%), followed by the gas product (9.1%). Among all the sulfur species in raw sludge, aliphatic-S was the most thermally unstable. SO 4 2-S and sulfur-containing gas were primarily formed from the decomposition of water-insoluble aliphatic-S, while part of thiophene-S/aromatic-S in aqueous products was generated from water-soluble sulfone-S and sulfoxide-S at high temperatures of ≥160 °C. The results indicate that 210 °C is the optimal temperature for preparing of sludge-based fuel during hydrothermal carbonization, and water washing pre-treatment is a good strategy for enhancing the removal of sulfur in hydrochar and reducing the release of sulfur-containing odorous gas. [ABSTRACT FROM AUTHOR]

Published
2023
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48. Control Conflict Suppressing and Stability Improving for an MMC Distributed Control System

Author

Haiyu Wang, Shun Liu, Hang Su, Huang Jingchun, and Shunfeng Yang

Subjects
Flexibility (engineering), Coupling, business.industry, Computer science, digestive, oral, and skin physiology, Control (management), Stability (learning theory), Modular design, Control theory, Control system, Thermal stability, Electrical and Electronic Engineering, business, Distributed control system
Abstract

Compared with traditional centralized control strategies, the distributed control systems significantly improve the flexibility and expandability of an modular multilevel converter (MMC). However, the stability issue in the MMC distributed control system with the presence of control loop coupling interactions is rarely discussed in existing research works. This article is to improve the stability of an MMC distributed control system by inhibiting the control conflict due to the coupling interactions among control loops with incomplete control information. By modeling the MMC distributed control system, the control loop coupling interactions are analyzed and the essential cause of control conflict is revealed. Accordingly, a control parameter design principle is proposed to effectively suppress the disturbances from the targeted control conflict and improve the MMC system stability. The rationality of the theoretical analysis and the effectiveness of the control parameter design principle are confirmed by simulation and experimental results.

Published
2020

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