Qianshi Song

Qianshi Song
Chinese Academy of Sciences | CAS · Guangzhou Institute of Energy Conversion

Visiting Scholar, Kyoto University, Japan

About

22
Publications
2,829
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93
Citations
Citations since 2017
22 Research Items
93 Citations
20172018201920202021202220230102030
20172018201920202021202220230102030
20172018201920202021202220230102030
20172018201920202021202220230102030
Introduction
Qianshi Song is mainly engaged in ①:the research on the reaction kinetics of thermochemical conversion of solid fuels or solid wastes;②:the research on pyrolysis products of sludge and carbon containing solid waste. Based on the analysis of char pore structure, and then establish a general kinetic model of thermochemical conversion process.

Publications

Publications (22)
Article
The objective of this study is to investigate the effects of inorganic element catalysis and basic fuel properties of sewage sludge on pyrolysis kinetics and self-sustained smoldering characteristics. The sludge pyrolysis process was explored by thermogravimetric and iso-conversion methods, and it was found that the pyrolysis process can be divided...
Article
A kinetic model of char-CO2 gasification reaction with the influence of inorganic elements was established based on gas-solid simple collision theory. In the modeling process, the effects of the content of seven inorganic elements, the catalytic/inhibitory factor, and the fully catalytic ratio of single inorganic element on the char-CO2 reactivity...
Article
Methylcyclohexane (MCH) and n-heptane (nC7) were used to perform experimental studies in high-temperature oxidation pretreated STS304 reactor (ϕ2 × 0.5 × 1000 mm) at 873–1073 K, 1.0 MPa, and 1.0 mL/min feed rate. The heat sinks of the two fuels were calculated based on the conversion and product distribution. MCH was found to have difficulty in ach...
Article
In this study, a theoretical model of biomass char gasification reactivity was developed, focusing on the catalytic effect of inorganic elements on the char gasification process. A comparison with previous research results shows that the catalytic ability of K in a fixed bed reactor is stronger than that of Ca, while the catalytic ability of Ca in...
Article
Full-text available
Paper mill sludge (PMS) is an abundant organic solid waste with complex composition from the pulp and paper industry. In this study, the Fe2O3 was used as a catalyst during PMS pyrolysis to reduce the emission of nitrogen-containing pollutants and tar formation. The transformation of N, N retention rate, and resulting biochar products were comprehe...
Article
In order to study the new cracking process characteristics of hydrocarbon feedstock to light olefins by direct flue gas heating, the pyrolysis experiments of n-heptane in CO2 and H2O atmosphere were performed in pretreated STS316L flow reactor (ϕ10 mm × 2.5 mm × 700 mm) at a temperature range of 1073–1373 K, pressure range of 0.1–1.0 MPa. By changi...
Article
Four different types of solid waste samples were selected for pyrolysis experiments to explore the distribution law of solid,liquid,and gas products under the influences of different pyrolysis temperature,residence time,carrier gas flow and heating rate. Based on the back propagation(BP)neural network principle and the Matlab neural network toolbox...
Article
This study was performed to analyse the adaptability of the self-developed char reactivity model and reveal the influence of preparation conditions on the char gasification reactivity. Firstly, six coal samples were selected for the step-by-step extraction of the metal elements. The forms of K elements in the different coal samples were quite diffe...
Article
Full-text available
Coke deposition is considered a challenging problem during hydrocarbon pyrolysis. To get more insights into pyrolysis coking characteristics in the regenerative cooling channels, the unsteady-state experiments of n-heptane were performed in a 2.0 mm (internal diameter) passivated STS304 tube at 873–1073 K and 1.0 MPa with a feeding flow rate of 1.0...
Article
Full-text available
Four solid wastes including sludge, watermelon rind, corncob, and eucalyptus and their demineralized samples were selected to conduct pyrolysis experiments under different experimental conditions, including temperature, residence time, carrier gas flow rate, and heating rate, respectively. The co‐pyrolysis experiment was carried out after mixing di...
Article
The pyrolysis experiments of n-heptane in the CO2/H2O atmosphere were carried out in a millimeter-sized tube reactor. Mass yields and molar concentrations of gaseous products, including C2H4, C3H6, H2, CO, CH4, and C2H6, were obtained at a temperature range of 1073−1373 K, and atmospheric pressure. The pyrolysis characteristics of n-heptane under d...
Article
Full-text available
In this work, the structural function of char gasification is modelled theoretically. Considering that different components will have different pore characteristics after pyrolysis, char is divided into different micro-structures according to its corresponding components, and then a structural equation is constructed to realize the theoretical calc...
Article
A model was established to describe the effects of inorganic matter on the char-CO2 gasification reactivity. The effects of seven inorganic elements on the char-CO2 reactivity were considered: K, Na, Ca, Mg and Fe, which play a catalytic role, and Si and Al, which play an inhibitory role. A catalytic/inhibitory index factor model and a saturated ca...
Article
Full-text available
Experimental studies on premixed flame propagation characteristics in a sub-millimeter-scale closed chamber are performed. Propane/air mixtures are ignited in the center of the visualized chamber and the subsequent flame front evolution process is recorded. The effects of the gap size of the chamber and the initial pressure of the mixture on the fl...
Article
Full-text available
Flame propagation pictures of a propane/air mixture are captured by a high-speed camera in a visualized constant volume combustion chamber with a diameter of 150 mm, a parallel plate height of H = 1.45 mm, and an initial pressure of P0 = 1.25 ~ 3.00 bar, in the range of flammable equivalence ratios. The results show that when H of the combustion ch...
Article
Full-text available
Based on the optimization of the recently proposed gas phase mechanism for n-heptane pyrolysis, mechanisms for polycyclic aromatic hydrocarbon (PAH) formation and a detailed wall surface reaction, a basic gaseous pyrolysis mechanism with 1127 steps and a simplified surface reaction mechanism with 34 steps were developed, respectively. After perform...
Article
Full-text available
A thermal cracking experimental equipment of hydrocarbon fuels was built to study n-heptane pyrolysis and the effect of reaction conditions on this reaction process. The main species were measured and the change rules were analyzed on the range of temperature 873–1073 K and pressure 0.1–3.5 MPa. The total content of alkenes products was more than a...
Article
Based on the simple collision theory (SCT), the calculation method of biomass char gasification rate was developed and the combined parameters to characterize the pre-exponential factor were found. Furthermore, some experimental tests for six acid-washed biomass chars, such as the isothermal gasification and so on, were performed under CO2 atmosphe...

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Projects (3)
Project
Semi-char gasification reaction is the rate-control step in the process of biomass thermochemical conversion, which determines the residence time of samples in the gasifier and the structural size of the gasifier. Theoretical modeling of biomass in-situ semi-char gasification reactivity is of great significance for guiding the design of gasifier and controlling the biomass thermochemical conversion process. Aiming at the lack of general kinetic model of in-situ semi-char gasification in the process of biomass thermal conversion, the project will adopt the research method of combining theoretical research, model construction and principle experimental verification, and decouple the physical and chemical factors affecting the process of biomass thermal conversion. The project focuses on three aspects: the evolution law of semi-char pore structure in the process of biomass pyrolysis, the correlation mechanism between semi-char and macromolecular volatiles, and the construction of in-situ semi-char gasification reaction kinetic model under single/interactive atmosphere. The theoretical relationship between the semi-char gasification reaction rate and the characteristic parameters of biomass and reaction conditions will be explored and established. Through the comparison, verification and optimization between the model calculated values and the experimental results, a general model of biomass in-situ char intrinsic gasification reaction rate with clear physical meaning, accurate calculation and convenient use will be proposed, which will provide necessary scientific basis and theoretical support for the optimal design of the reactor.