Institutional Repository of GuangZhou Institute of Energy Conversion, CAS
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Numerical study on the heat and moisture transfer characteristics of FAM Z01 coated heat exchanger with different direction configuration of air flows
No full textThe internal cooling fluid is used to remove adsorption heat and improve dehumidification performance in desiccant coated heat exchangers (DCHEs), and its direction configuration not only has a significant impact on the heat and moisture transfer characteristics, but also sometimes determines the complexity of theoretical analysis. In this study, a simplified two-dimensional numerical model was developed to simulate the heat and moisture transfer within an air-cooling type FAM Z01 DCHE. The proposed model considers the local heat and moisture transfer mechanism and the effect of direction configuration of air flows. A parametric analysis is carried out for cross flow, counter current flow and cocurrent flow DCHEs. Results shows that the numerical model can receive a highly-reliable accuracy. The dehumidification performance indices of three DCHEs exhibit complex variation patterns under various parameters. The counter current flow DCHE demonstrates a better heat and moisture transfer performance compared to cross flow and cocurrent flow DCHEs. It can be found that the maximum relative deviation of dehumidification coefficient of performance DCOP between the cross flow DCHE and the other two DCHE is just 14.1%, indicating a feasible way for simplifying numerical modeling by transforming cross flow DCHE into counter current or cocurrent flow DCHE
Science and Technology Commission of Chongqing Municipality project[cstc2021jcyj-bshX0060]
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Science and Technology Apparatus Development Program of the Chinese Academy of Sciences[2020B0301030003]
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Co-pyrolysis coking characteristics of nC12H26 and DHN/MeOH/EtOH/MF/ DMF/H2O/H2/CO2/CO/N2 under supercritical condition
No full textThe introduction of additives or carrier gases to change the physicochemical process of endothermic fuel in a regenerative cooling channel and then regulate the carbon deposition behavior is an important coking control method. In this work, the co -pyrolysis and coking behavior of several novel additives, such as alcohols, furans, flue gas, and syngas, is compared under the supercritical condition of n-dodecane (nC12H26) with the traditional hydrogen supply agent decalin (DHN) and inert nitrogen (N2) as the basis in a 304STS tube with an inner diameter of 2 mm. Results show that the addition of methanol (MeOH) / ethanol (EtOH) / 2-methylfuran (MF) / 2,5-dimethylfuran (DMF) promotes the pyrolysis of nC12H26 and shows a strong coking trend. The coking rate of carbon monoxide (CO) addition is higher than that of carbon dioxide (CO2) addition, and the system is prone to presenting an exothermic chemical effect. The addition of hydrogen (H2) does not contribute to the hydrogen source but leads to a high coking risk at a low blend ratio. Although water (H2O) and CO2 atmospheres exhibit coke inhibition potential, they weaken the heat absorption capacity of nC12H26. The co -pyrolysis of alcohols, furans, and hydrocarbon feedstock to CO needs to be controlled in a targeted manner, so that endothermic fuels have high heat sink and low coking tendency in regenerative cooling channels
Holistic investigation of structural evolution in corn stover lignin under pretreatment with varying γ-valerolactone concentrations
No full textUntil now, research on green and sustainable gamma-valerolactone (GVL) pretreatment has predominantly centered on component separation efficiency, with limited attention given to the lignin structure. Nonetheless, the lignin's structure is considerably affected by the fractionation, consequently influencing its potential valorization. Herein, we conducted a holistic investigation of the structural evolution of two fractions of lignin in corn stover, obtained under pretreatment with varying GVL concentrations: GVL lignin (GVLL) originated from pretreatment liquor and cellulolytic enzyme lignin (CEL) separated from pretreated residue. Our findings indicated a general positive correlation between the molecular weight and polydispersity index of both GVLL and CEL with the increasing GVL concentration. This phenomenon is attributed to the enhanced lignin dissolution and relocation as the GVL concentration increases. Moreover, higher GVL concentrations also increased the acidity of reaction system, leading to degradation of beta-O-4 linkages from 45.2 to 34.9 and 57.6 to 37.9 per 100 aromatic units in GVLL and CEL, respectively. Compared to CEL, GVLL exhibited a more remarkable phenolics yield (33.7% vs. 22.2%) during hydrodeoxygenation due to its superior purity and lower degree of polymerization. Recycling studies demonstrated the stability of GVL at lower concentrations. These findings provide valuable insights for optimizing GVL pretreatment systems
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