Match!
Jiansheng Zhang
Tsinghua University
45Publications
13H-index
426Citations
Publications 33
Newest
#1Weiwei XuanH-Index: 3
#2Haonan WangH-Index: 1
Last.Jiansheng ZhangH-Index: 13
view all 4 authors...
The properties of coal slags in slagging gasifiers such as viscosity are intrinsically determined by structure. In this article, the structure of ten coal slags is investigated by a combination of nuclear magnetic resonance (NMR) experiment and molecular dynamics (MD) simulation quantitatively. The proportions of different structural units Qn with Si as the centered atom are determined and the results from NMR experiment and MD simulation agree well. As the basicity increases, the proportion of ...
Source
#1Jiazhou Li (THU: Tsinghua University)
#2Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
Last.Yitian Fang (CAS: Chinese Academy of Sciences)H-Index: 21
view all 4 authors...
Petroleum coke (petcoke) ash fusibility is closely related to the ash-related fouling and slagging, which have significant effects on its clean and efficient utilization. Sodium (Na) element in petcoke ash is considered to induce ash fouling and slagging. In this paper, we investigate the effect of Na2O on the petcoke ash fusibility from the perspectives of atmosphere, Na2O content, and temperature. The crystalline minerals and surface morphologies of high-temperature ashes were determined by X-...
Source
#1Weiwei Xuan (USTB: University of Science and Technology Beijing)H-Index: 3
#2Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
Last.Dehong Xia (USTB: University of Science and Technology Beijing)H-Index: 3
view all 3 authors...
Abstract Crystallization is a significant challenge for the rheological properties of the liquid slag flowing down along the wall of entrained flow gasifier. Viscosity can increase sharply when certain crystals occur inside the slag. Chemical compositions are the intrinsic factors in determining the crystallization characteristics. In former studies, we have investigated the influence of major components such as SiO2, Al2O3, CaO, Fe2O3 as well as atmosphere based on synthetic coal slags. While f...
3 CitationsSource
#1Weiwei Xuan (USTB: University of Science and Technology Beijing)H-Index: 3
#2Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
Last.Dehong Xia (USTB: University of Science and Technology Beijing)H-Index: 3
view all 3 authors...
Abstract Crystallization inside the liquid slag can increase the viscosity, affecting flow down the wall which is associated with the temperature of critical viscosity ( T cv ). Four groups of synthetic slags with different Si/Al, Si + Al, CaO, Fe 2 O 3 ratios were sorted to study the crystallization characteristics including the crystallization tendency as well as crystallization temperature ( T crys ). Samples with base–acid ratio (R > 0.7) and Si/Al in the range of 1–4 are liable to crystalli...
2 CitationsSource
#1Weiwei Xuan (USTB: University of Science and Technology Beijing)H-Index: 3
#2Qian Wang (THU: Tsinghua University)H-Index: 1
Last.Dehong Xia (USTB: University of Science and Technology Beijing)H-Index: 3
view all 4 authors...
Abstract Crystallization inside the liquid slag of entrained flow gasifiers can increase the viscosity of the slag, affecting flow down the wall and resulting in operational problems. The chemical component of the slag is an intrinsic factor of crystallization characteristics. In the study presented here, Differential Scanning Calorimetry (DSC) and the Single Hot Thermocouple Technique (SHTT) were combined to investigate the influence of (SiO 2 + Al 2 O 3 ) ratios on crystallization temperature ...
9 CitationsSource
#1Weiwei Xuan (USTB: University of Science and Technology Beijing)H-Index: 1
#2Qingliang GuanH-Index: 6
Last.Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
view all 3 authors...
Abstract A comprehensive three-dimensional numerical model has been developed to for entrained flow coal hydrogasifier reactor. The kinetic model includes water evaporation, Johnson and Tran hydropyrolysis model, semichar reactions and secondary tar hydrocracking reactions. Numerical CFD(Computational Fluid Dynamics) simulation were performed using this model on a 6 t/d hydrogasifier reactor and the predictions are in good agreement with experimental results on coal conversion on a Dry Ash-Free ...
5 CitationsSource
#1Weiwei Xuan (USTB: University of Science and Technology Beijing)H-Index: 3
#2Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
Last.Dehong Xia (USTB: University of Science and Technology Beijing)H-Index: 3
view all 3 authors...
Abstract In entrained flow gasifiers, crystallization inside the liquid slag can cause an increase of the slag viscosity, affecting flow along the wall and resulting in operational challenges. In the study reported here, a real Chinese ash was investigated for its crystallization behavior as well as the viscosity. Differential Scanning Calorimetry (DSC) and the Single Hot Thermocouple Technique (SHTT) were combined to measure the crystallization temperature and observe the crystallization proces...
19 CitationsSource
#1Dapeng Bi (THU: Tsinghua University)H-Index: 6
#2Qingliang Guan (THU: Tsinghua University)H-Index: 6
Last.Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
view all 4 authors...
Abstract Based on chemical equilibrium assumption, a comprehensive three-dimensional numerical model was developed for a GSP gasifier. The Euler–Lagrange approach was applied to describe the multiphase flow in the reactor. The mixture fractions were used to describe the thermochemistry. The probability density function (PDF) of β -function was used to model the turbulence–chemistry interaction. The stochastic tracking technique was used to model turbulence–particle motion interaction. The predic...
12 CitationsSource
#1Qingliang Guan (THU: Tsinghua University)H-Index: 6
#2Dapeng Bi (THU: Tsinghua University)H-Index: 6
Last.Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
view all 4 authors...
Abstract A kinetic model of hydropyrolysis was developed based on the Chemical Percolation Devolatilization (CPD) network devolatilization model, considering the hydrogenation reactions of active species and fragments produced during the decomposition of the coal structure with hydrogen. Light gas compositions were calculated and the yields of oxygen-containing species were corrected. The calculation results show that the model well predicts the yields of volatile matter and methane for the coal...
2 CitationsSource
#1Dapeng Bi (THU: Tsinghua University)H-Index: 6
#2Qingliang Guan (THU: Tsinghua University)H-Index: 6
Last.Jiansheng Zhang (THU: Tsinghua University)H-Index: 13
view all 4 authors...
Abstract A slag flow and heat transfer model coupled with a particle capture sub-model and 3-D gasifier model was developed to describe the slag characteristics and gasification process in entrained flow gasifier. A criterion for particle capture was used to evaluate the interaction of particles colliding with the wall. Two kinds of gasifiers were simulated using the developed model: the membrane wall gasifier and the refractory wall gasifier. The model was proved reliable by comparing the simul...
21 CitationsSource
1234