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Yiqun Huang
Tsinghua University
10Publications
1H-index
5Citations
Publications 10
Newest
#1Runxia CaiH-Index: 4
#2Xiwei KeH-Index: 1
Last.Man ZhangH-Index: 9
view all 9 authors...
With the stringent emission regulation taking effect, it is difficult for the conventional desulfurization technology in circulating fluidized bed (CFB) boilers to meet the requirements on ultra-low SO2 emission. Therefore, in this paper, the application of natural ultrafine limestone, with Sauter mean diameter of less than 20 μm, was tested by conducting bench-scale, pilot-scale and commercial-scale experiments to realize the highly efficient desulfurization in CFB furnaces. In the past, such s...
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#1Yiqun Huang (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Yan Jin
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Abstract Due to high ash content and anisotropy of bedding structure, the effects of ash thickness and bedding structure anisotropy on combustion of oil shale semicoke were crucial. A two-dimensional mathematical model of oil shale semicoke particle combustion was developed and validated by combustion experiments of cylindrical Huadian oil shale semicoke particles on the self-designed Macro thermal gravimetric analyzer (TGA), with a weighting capacity over 100 g. There was obvious anisotropy dur...
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#1Runxia CaiH-Index: 4
#2Yiqun HuangH-Index: 1
Last.Junfu LyuH-Index: 4
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Limestone particle size has a crucial influence on SO2 capture efficiency, however there are few studies on the sulfation reactivity, which covers a broad range of particle sizes at low SO2 concentrations. In this paper, a large-capacity thermogravimetric analyzer (LC-TGA) was developed to obtain the sulfur removal reaction rate under a wide range of particle sizes (3 μm–600 μm) and SO2 concentrations (250 ppm–2000 ppm), and then compared with the results of a traditional fixed bed reactor and a...
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#1Yi Zhang (THU: Tsinghua University)
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Hairui Yang (THU: Tsinghua University)H-Index: 19
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Abstract The bed inventory overturn in pant-leg CFB boilers and bed pressure wave in single air distributor CFB boilers were the two well-known non-uniformity problems in large scale CFB boilers. However, a special gas solid flow non-uniformity problem, bed pressure deviation, occurred in a single air distributor 330 MW CFB boiler. The bed pressure in one side was 2 kPa constantly higher than that in the other side and lasted for a long time, resulting to the local over temperature and endangeri...
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#1Shahong Zhu (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Guangxi Yue (THU: Tsinghua University)H-Index: 17
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Abstract While the power plant units are the developing towards larger capacity, the relative shortage in thermal efficiency of the circulating fluidized bed (CFB) boiler unit, which has obtained significant development in recent years, is becoming more and more apparent. However, the thermal efficiency computational model applied for different CFB boiler units are not derived yet. Based on Generalized Energy Efficiency Distribution Matrix (GEEDM) model which is designed for normal pulverized co...
1 CitationsSource
#1Runxia Cai (THU: Tsinghua University)H-Index: 4
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Junfu Lyu (THU: Tsinghua University)H-Index: 4
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Abstract External heat exchangers (EHEs) are widely used in many industrial fields for heat absorption, such as circulating fluidized bed combustion, solar energy generation, etc. However, considerable deviation of tube wall temperatures was found in the commercial EHEs, which will result in the overheating of tubes and affect the safe operation. In order to investigate the non-uniform heat transfer phenomenon, local heat transfer and hydrodynamics with a horizontal tube and a vertical tube as w...
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#1Yiqun Huang (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 1
Last.Hairui Yang (THU: Tsinghua University)H-Index: 1
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Abstract In this paper, the combustion process of oil shale semicoke was investigated by modeling, where intraparticle mass transfer resistance was especially considered. The ash formation and attrition characteristics of oil shale semicoke were also investigated by a laboratory test procedure. The burnout time and residence time of different particle sizes were predicted, and the maximum particle size of which oil shale semicoke could be burned out in a 3 MW circulating fluidized bed boiler was...
2 CitationsSource
#1Yiqun Huang (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Hairui Yang (THU: Tsinghua University)H-Index: 19
view all 5 authors...
Abstract This paper, first of a two-paper series, analyzes the experimental results to clarify the effects of gas leakage on the separation performance of a cyclone. Experiments were carried out in a cold model of a cyclone. Varied parameters were inlet gas velocity, inlet solid concentration, and gas leakage velocity. In the experimental range, the pressure drops over a cyclone showed small variation with the increase in gas leakage velocity. When the gas leakage fraction exceeded 4%, experimen...
1 CitationsSource
#1Yiqun Huang (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Hairui Yang (THU: Tsinghua University)H-Index: 19
view all 5 authors...
Abstract This paper, the second part of a two-paper series, discusses the computational particle fluid dynamics (CPFD) simulation results to clarify the effects of gas leakage on the separation performance of a cyclone. Compared with the experimental results in Part 1 of this two-paper series, the CPFD simulation results showed good agreements on the pressure drop, the overall separation efficiency, and the grade efficiency. Gas leakage would reduce the swirling intensity in the cyclone, make th...
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#1Yiqun Huang (THU: Tsinghua University)H-Index: 1
#2Man Zhang (THU: Tsinghua University)H-Index: 9
Last.Qing Liu (THU: Tsinghua University)H-Index: 11
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Abstract A comprehensive model accounting for intraparticle heat and mass transport phenomena, primary and secondary reaction processes was developed. Mass loss history, particle surface temperature history, and volatile product distribution of oil shale particles at different pyrolysis temperatures were favorably compared with experimental data. Particle size and reactor temperature would affect temperature and residue solid density distribution in oil shale particle. It was proved by the model...
1 CitationsSource
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