Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Systematic analysis of reservoir properties on gas recovery from natural gas hydrate by multi-branch vertical wells: Examples from the Shenhu Sea of China
No full textAvailable studies indicate that a multi-branch vertical well (MVW) may be the most appropriate well type for natural gas hydrate (NGH) exploitation, and the effect of branch parameters on gas production has been extensively explored. However, there is still a lack of systematic research and organization on how reservoir properties like reservoir types, porosity, and thickness affect gas production indexes. Consequently, we established Class 1-3 reservoir models and designed a series of cases to analyze the effect of reservoir properties on the exploitation with MVW. Results indicate that (i) MVW may be suitable for short-term production in Class 1 and Class 2 reservoirs and long-term production in the Class 3 reservoir, and the main well of MVW accounts for about 19% of gas production. (ii) It is preferable to locate the branches as close to the top of the reservoir as possible while maintaining reasonable spacing to capture the dissociated gas escaping from the lower reservoir. In addition, in Class 1 reservoirs, branches below the main well can capture free gas in the mixed layer. (iii) Reservoir parameters, including saturation, porosity, permeability, and thickness, make a significant difference in gas production, which provides an essential basis for further research by correlation analysis and polynomial fitting
Innovative strategy to enhance bioconversion of sweet sorghum bagasse (SSB) by the combination of bio-fortified ensiling and dilute alkali pretreatment
No full textThe characteristics of seasonal-harvesting and recalcitrance to biodegradation hinder the efficient bioenergy utilization of biomass. To overcome the drawbacks, it's necessary to develop an integrated strategy for ensiling preservation to improve the bioconversion of lignocellulosic biomass. In this study, sweet sorghum bagasse (SSB) was ensiled for 21 days, followed by diluted NaOH pretreatment to enhance the biodegradability. Compared with the raw SSB and non-biofortified silage, the bio-fortified ensiling with L. plantarum alone or both L. plantarum and fibrolytic enzyme promoted the degradation of lignocellulose (e.g., hemicellulose, lignin) of SSB. Based on the membership function, L. plantarum additives was the most efficient for the improvement of ensiling quality. The genus of Lactobacillus (3.91-40.45%), Enterobacteriaceae (11.63-38.58%), and Pantoea (8.21-28.01%) were dominant at 21 days, accompanied by the high content of lactic and acetic acid in different silages. Moreover, Lactobacillus was beneficial to ensiling quality. Comparing to raw SSB (40.91%), the enzymatic efficiency of SSB sharply increased to 88.52% by the combination pretreatment of bio-fortified ensiling with L. plantarum and subsequent 2% NaOH, which was the most economical pretreatment method. In short, this work proposes a promising strategy by combining bio-fortified ensiling and NaOH pretreatment for the storage and bioenergy production of SSB
Performance Comparison of High-Temperature Heat Pumps with Different Vapor Refrigerant Injection Techniques
No full textIn order to develop a highly efficient and stable high-temperature heat pump to realize high-efficient electrification in the industrial sector, performance of high-temperature heat pumps with a flash tank vapor injection and sub-cooler vapor injection are compared under different evaporation temperatures, condensation temperatures, compressor suction superheat degrees, subcooling degrees and compressor isentropic efficiencies. The results show that the COP, injection mass flow ratio and VHC of the FTVC are higher than those of the SVIC-0, SVIC-5, SVIC-10 and SVIC-20 under the same working conditions, while the discharge temperature of the FTVC is approximately equal to that of the SVIC-0 and lower than those of the SVIC-5, SVIC-10 and SVIC-20. When the evaporation temperature, the condensation temperature and injection pressure are 55 degrees C, 125 degrees C and 921.4 kPa, respectively, the system COP of the FTVC is 4.49, which is approximately 6.7%, 7.3%, 7.8% and 8.9% higher than those of the SVIC-0, SVIC-5, SVIC-10, and SVIC-20, respectively
Guangdong Special Support Program-Local innovation and entrepreneurship team project[GDME-2020D044]
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Effect of Biochar in Modulating Anaerobic Digestion Performance and Microbial Structure Community of Different Inoculum Sources
No full textBiochar has attracted increasing attention as an additive for enhancing the performance of anaerobic digestion (AD), but the effect of biochar on microbial regulatory mechanisms in enhancing AD performance is unclear. To investigate how biochar modulates the process of AD, different inoculum sources including cellulose-peptone-swine inoculum (CPI) and swine manure inoculum (SMI) were designed to determine the effect of biochar on the performance and microbial communities of anaerobic digestion of the feedstock concentration from 1 to 6%. The results showed that the methane yields of CPI seeds were higher 20.3-38.7% than those of SMI seeds without a biochar addition, whereas the biochar addition reduced 5.3 and 23.1% of the corresponding methane yield of CPI and SMI, respectively. The biochar enhances the accumulation of volatile fatty acids (VFAs) and weakens the potential ammonia inhibition by adsorption, and it can improve the degradation rate of organic content of soluble COD for different inoculum sources. Microbial community analyses showed that the biochar addition could facilitate the growth of Bacteroidetes and Clostridiales, and it enriched the relative abundance of hydrogenotrophic methanogens Methanobrevibacter and Methanobacterium. Overall, although the modulation of biochar possessed different effects on the anaerobic digestion performance, it contributed to the stability and degradation efficiency of the digestion system. The recycling implication of biochar is critical to realizing a low-carbon and renewable treatment system for organic wastes
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