Qiang Song

Qiang Song
Tsinghua University | TH · Department of Energy andPower Engineering

PhD

About

160
Publications
17,468
Reads
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1,872
Citations
Citations since 2017
48 Research Items
1253 Citations
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
2017201820192020202120222023050100150200250
Additional affiliations
May 2000 - present
Tsinghua University
Position
  • Professor (Associate)
August 1999 - May 2000
Education
September 1994 - July 1999
Tsinghua University
Field of study
  • Engineering Thermophysics

Publications

Publications (160)
Article
Arsenic (As) transformation during flue-gas cooling process determines terminal As emission. In this study, the dominant role of chemical adsorption in gaseous As transformed to ash was confirmed. Dynamic curves of As2O3 adsorption by ash at 500–900 °C were obtained. The adsorbed As amount increased linearly with time, far from reaching saturation,...
Article
Understanding the transformation of Se during the flue-gas cooling process is important for controlling Se emissions. By analyzing the thermal stability of Se in ash collected from power plant dust collectors, physical migration was found to be the main pathway by which gaseous Se transformed into ash during the flue-gas cooling process. The dynami...
Article
The retention of arsenic (As) during coal combustion facilitates As emission control. A fixed-bed experimental system was used to conduct devolatilization and char combustion experiments at 1100–1300 °C using three types of coal. Both processes contributed to the As release. As in coal was bound to carbonate, oxide, sulfide, and aluminosilicate (Al...
Article
Full-text available
Understanding the phenomenon of filmwise condensation on solid surfaces is vital for industrial processes such as air pollutant control and desalination. In this work, we study the formation of condensed liquid films via molecular dynamics simulations, and the effects of solid-fluid interactions and the sulfuric acid component are given major atten...
Article
The sampling accuracy for high-temperature flue gas is limited by the particle deposition on the sampling tube wall, which is important for the study of fuel conversion. Herein, deposition of 0.1–10 μm particles in 300–1000 K flue gas in the sampling tube is numerically investigated, and the corresponding particle loss is quantified by theoretical...
Article
Exploring arsenic (As) transformation during coal combustion is beneficial for reducing its pollution. Herein, combustion experiments were developed at 1100–1300 °C in a fixed-bed experimental system with 25 types of coal samples. The occurrences of As in coal and combustion products were characterized. All the original forms of As in coal were fou...
Article
The pollution caused by sulfuric acid mist emissions has attracted attention due to demand of low emissions. In this work, molecular dynamics simulation was used to investigate effects of particle properties on nucleation process in a sulfuric acid–water vapor mixture. The effects of particle properties, including particle-vapor interaction and par...
Article
The interaction between flue gas and ash causes the redistribution of heavy metals and affect their emission characteristics. In this study, a double-layer fixed-bed reactor was used to investigate the effect of this interaction on Pb distribution at 800–1000 °C. Obvious gaseous Pb adsorption by ash just occurred in the case of high-Pb flue gas and...
Article
SO3 in coal-fired flue gas will cause equipment corrosion and the emission of sulfuric acid mist. The performance of injecting the alkaline adsorbent into the flue gas to remove SO3 is affected by the adsorption of SO2 in the flue gas. Taking Ca(OH)2 as a typical alkaline adsorbent, a model describing the adsorption of SO3 and SO2 by Ca(OH)2 partic...
Article
Transformation of As in the post-combustion zone has a significant effect on its emission characteristics. In this study, redistribution of As that occurs during the interaction between flue gas and ash has been elucidated using a double-layer fixed-bed reactor at 800–1000 °C. Herein, flue gas and ash samples with different As contents and inorgani...
Article
Ensuring the sustainable propagation of the combustion zone is a prerequisite for in-situ combustion (ISC). The combustion zone propagation processes with different gas injection parameters and reservoir properties were simulated with CMG STARS and a method of determining the propagation state was proposed based on the theoretical analysis of the s...
Article
Full-text available
Micron particles rotate and their trajectories deviate from the impact direction when impacting the liquid surface obliquely; thus their impact dynamics is largely different from that of vertical impact, which remains to be studied in depth. In this study we established a three-dimensional simulation method by solving the coupled equations of parti...
Article
Coke formation during the process of in-situ combustion is affected by clay minerals, among which montmorillonite shows the most significant effect. A fixed-bed reactor was used to conduct the thermal conversion experiments of heavy oil and model compounds to reveal the mechanism of montmorillonite affecting the coke formation. Under the inert atmo...
Article
Full-text available
Impact of microspheres on liquid surfaces is a universal phenomenon in nature and in industrial processes. However, most relevant studies have mainly focused on the sphere’s vertical impact. Herein, we present the first observation on the oblique impact of microspheres on the surface of quiescent liquid using high-speed microphotography. The sphere...
Article
Study on selenium (Se) transformation during coal combustion will facilitate the development of emission–control technologies. A fixed–bed reactor was used to conduct pyrolysis and combustion experiments involving three types of coal at 600–1000 °C. In an inert atmosphere, the release ratios of Se increased slowly as temperature increased, varying...
Article
Full-text available
The oil oxidation characteristics of the whole temperature regions from 30 °C to 600 °C during oil reservoir air injection were revealed by experiments. The whole oil oxidation temperature regions were divided into four different parts: dissolving and inflation region, low temperature oxidation region, medium temperature oxidation region and high t...
Article
In this study, an improved calibration method for the in-situ measurement of potassium (K), concentration in the flame field was developed using laser induced breakdown spectroscopy (LIBS). The temporal behaviors of K release and particle temperature were recorded simultaneously during biomass combustion. During combustion of raw willow wood, the m...
Article
When in situ combustion is applied to reservoirs that have been exploited by steam recovery, the influence of high water saturation on the thermal conversion of heavy oil into coke needs to be evaluated. A Xinjiang heavy oil was used as the sample. A thermogravimetric analyzer and a pressurized reactor were used to study the influence of steam on t...
Article
Heavy oil coking is an important process for in situ combustion. The coking characteristics of two low-asphaltene heavy oils from Fengcheng (FC) and Hongqian (HQ) oilfields, which are different in viscosity, density, and composition, were studied in a fixed bed reaction system in pyrolysis and oxidizing atmospheres. FC heavy oil showed a 35% higher...
Article
The vapor pressure data of Se and SeO2 in low temperature range are essential for the study of emission and migration of selenium from stationary sources. The vapor pressure of SeO2 at 353.2–473.2 K was measured by thermogravimetric analysis, and the corresponding pressure was 0.026–319.2 Pa. The vapor pressure of Se at 423.2–573.2 K was measured,...
Article
Studying the transformation of heavy metals during the coal combustion process is of great significance to controlling their emission. In this study, three coals with different contents of arsenic (As), lead (Pb) and mineral elements were selected. The experiments were conducted at 900-1300 °C using a drop tube furnace system. The transformation of...
Article
The forms of arsenic (As) and lead (Pb) in coal have an important influence on their transformation during combustion. Considering that As and Pb in coal are partially associated with pyrite, pyrolysis and oxidation experiments were conducted on pyrite in a fixed-bed reactor between 600 and 1000 °C to study the transformation of As and Pb in pyrite...
Article
In situ combustion (ISC) is an efficient method to recover heavy oil, in which low-temperature oxidation (LTO) is an important process. A fixed-bed reactor was used to conduct ramped temperature oxidation experiments on a mixture of heavy oil from China, silica and clay minerals, including montmorillonite, kaolinite, illite and chlorite. The four c...
Article
Accurate prediction of coke yield is the basis for simulation and operation of the in situ combustion process. In view of the low asphaltene content of heavy oil in China, this study established a coke yield prediction model for the pyrolysis and oxidation processes of low-asphaltene heavy oil based on the coking characteristics of the main fractio...
Article
Particle impacting on a liquid surface is frequently observed in natural and industrial processes. This study numerically investigates the critical sinking behaviour after the impact of hydrophobic micron particles on liquid surfaces. The effects of contact angle θ, density ratio D, and the Reynolds number Re on the motions of the particle and TPCL...
Article
Alkaline injection is an effective way to control the emission of high concentration SO3 caused by the use of high-sulfur coal and selective catalytic reduction (SCR), but its performance is affected by the competitive absorption of SO2. A fixed-bed reactor was used to study the competitive absorption of SO3 and SO2 by Ca(OH)2. The dynamic absorpti...
Conference Paper
Water entry problem has attracted much interest in the past century, but few research focused on the oblique water entry of micron particles, which is very common in nature and industrial processes. The oblique water entry of micron PMMA particles with different impact angles is realized by a self-made impactor and observed with a high speed camera...
Article
Hypothesis Although the static flotation of elongated cylinders is well understood, their flotation behavior under dynamic conditions after contacting a liquid surface, such as in situations experienced by water-walking insects, still need to be revealed. Methodology The motion of elongated horizontal cylinders after zero-velocity contact with a l...
Article
Full-text available
The synergetic effect of wet flue gas desulfurization (WFGD) system can further reduce the emission of particulate matter from the coal-fired plants. Mathematical model and numerical method were established to describe the gas-liquid-solid three-phase movement in the tower, and the process of particle removal by spraying in WFGD system was simulate...
Article
The release of K during thermal utilization of biomass can cause fouling, slagging and other technical problems, while the released K might be recaptured by biomass char. In this work, cellulose char was used as a raw material to avoid the effects of inorganic elements in biomass char. The capture of gaseous KCl by cellulose char was examined at 90...
Article
The migration of K during biomass thermal conversion can cause severe ash-related problems. K2CO3 and KCl are two important inorganic forms of K that appear during biomass thermal conversion. In this study, a fixed-bed reactor was used to investigate the effect of H2O vapor and SiO2 on the migration characteristics of these two inorganic K species....
Article
The migration of K and Cl during biomass thermal utilization can cause serious ash-related problems. Pyrolysis experiments with KCl-loaded cellulose were conducted in a fixed-bed reactor to investigate the reaction of KCl with organic functional groups. The migration pathways of K and Cl were obtained based on the analysis of char samples after pyr...
Article
Full-text available
Small spheres released above the liquid surface experience a dynamic process to ultimately float or sink, and thus, their behaviours should be considered using dynamic analysis instead of static equilibrium. This study numerically investigates the motion of small spheres after contacting the liquid surface with zero velocity, and the flotation cond...
Article
In situ combustion is an enhanced method to recover heavy oil. The formation and oxidation of coke is crucial to promote the combustion front. Heavy oil from China and montmorillonite, a major type of clay, were used as samples in this study. The thermogravimetric analyzer (TGA) was applied to temperature-programmed oxidation/pyrolysis experiments...
Article
Hybrid structure significantly affects the collection mechanism and performance of a hybrid particulate collector. The electrostatic precipitation of particles in the wire-perforated plate structure of a full-scale compact hybrid particulate collector is numerically simulated in this study. The distributions of electric and flow fields and the char...
Article
Coking of heavy oil plays the key role in in-situ combustion, which is affected by conversion conditions. In this study, a fixed-bed reactor and a pressurized reactor were used to thermally transform a heavy oil sample from China into coke under different atmospheric conditions, ending temperatures, heating rates, and pressures. Elemental compositi...
Article
The release of alkali and alkaline earth metallic species (AAEMs) can cause serious technical problems during biomass thermal utilization. The release characteristics of AAEMs from rice straw char during pyrolysis in N2 and CO2 gasification at 900℃ were investigated using a fixed-bed reactor. The release and transformation results of AAEMs under bo...
Article
The advanced hybrid particulate collector (AHPC) is a highly promising and novel hybrid electrostatic filter technology that removes particles from flue gas. Perforated plates are used as collecting electrodes to attain better synergism between the electrostatic and bag zones. A laboratory-scale AHPC was built to investigate the dust collection per...
Article
Full-text available
In this study, a simulation method is established for the impaction of micron particles on liquid surfaces, by which the processes of two impaction modes (submergence and oscillation) are studied. The submergence is found to go through three stages, each of which shows different characteristics of particle velocity and gas–liquid interface variance...
Article
CaO affects urea pyrolysis when coalescing with melting urea, which decreased the performance of urea-SNCR deNOx process. The influence of CaO on urea pyrolysis was studied with a thermogravimetric analyzer, a fixed bed reactor, and DRIFTS. The mechanism of CaO was also analyzed. Experimental results showed that CaO decreased the pyrolysis rate of...
Article
CaO decreased the performance of the urea-selective non-catalytic reduction deNOx process by affecting the conversion of urea pyrolysis products. The effect of CaO on HNCO conversion was studied in a pyrolysis/gas–solid reaction system along with DRIFTS and SEM. CaO was found to react with HNCO, and HNCO conversion and product selectivity changed w...
Article
Particle impaction on a droplet surface directly affects the particle capture by the droplet, and this phenomenon is the basic process of wet scrubbing and wet deposition. The experimental system is established to in-situ observe the behavior of micron particles impacting on the liquid surface. 50–200 μm hydrophobic PMMA and PS particles were used....
Article
Pyrolysis and oxidation of heavy oil is the fundamental of in situ combustion process. Heavy oil from Xinjiang, China and its main components, saturates, aromatics and resins (SAR), were used as samples to study their pyrolysis and oxidation characteristics with a thermogravimetric analyzer (TGA) and a fixed-bed reactor. The DTG curves and the dete...
Article
Full-text available
One advantage of the hybrid particulate collector is the electrically enhanced filtration of charged particles which escape from the electrostatic precipitation zone. The effect of the enhancement is related to particle charge. The particle charge will decay during transportation. An experimental system including the charger, flow pipe and samplers...
Article
As an important particle collection method, filtration is significantly affected by particle precharging. The filtration of differently charged fly ash particles using membrane and fibrous filters was experimentally studied. Particle charge was directly measured and quantitatively related to the enhancement of filter performance. Particle penetrati...
Article
HCl capture experiments with rice straw char were conducted in a fixed-bed reactor at 500-900 °C. The capture capacities of rice straw char at different temperatures were determined. A significant amount of HCl was found to be captured by rice straw char at all temperatures, and the amount of captured HCl decreased gradually with increased temperat...
Article
CaO significantly influences the SNCR deNOx process. The adsorption and reaction mechanism of NH3+NO+O2 system on the CaO surface were studied in this work. Results showed that NH3 adsorbed onto the Lewis acid sites of CaO and the main ad-species were NH2 and OH. With increased temperature, NH2 dehydrogenation occurred and formed dinitride, which e...
Article
Full-text available
A single layer filtration system was developed to investigate the filtration and regeneration performance of diesel particle filter (DPF). The particle layer thickness was directly measured online to analyze the different filtration stages. The influence of particle property on particle layer stage performance was also investigated. The results ind...
Article
Full-text available
As a key mechanism of submicron particle capture in wet deposition and wet scrubbing processes, thermophoresis is influenced by the flow and temperature fields. Three-dimensional direct numerical simulations were conducted to quantify the characteristics of the flow and temperature fields around a droplet at three droplet Reynolds numbers (Re) that...
Article
NO can be reduced by biomass char, which is catalyzed by inherent potassium in char. The isothermal reactions of char-NO and temperature-programmed desorption of reacted chars were studied in a fixed-bed reactor with original biomass char and acid-washed biomass char as samples. Experimental results showed that significant formation of C(O) occurre...
Article
The release of inherent potassium may cause severe problems in biomass thermal utilization. A fast-pyrolysis experiment was carried out with rice straw at 400-1000 °C in a fixed-bed reactor. The release of K and Cl to gas and the occurrences of K in residues during devolatilization and char pyrolysis were quantified on the basis of the analysis of...
Article
Full-text available
During the combustion of coal or biomass, the inherent alkali metals in the fuel will be released to the gas phase. The released alkali species condensed during the cooling of the flue gas, which may subsequently cause problems with ash deposition and corrosion in thermal fuel conversion systems. Laser Induced Breakdown Spectroscopy (LIBS) is an ef...
Article
N2O is an innegligible pollutant emitted from circulating fluidized bed (CFB) boilers which may be reduced by NH3. The influence of bed material (mainly CaO) on the N2O+NH3+O2 system was investigated using a fixed bed reactor in the temperature range from 873 K to 1123 K. Experimental results showed that CaO catalyzed N2O decomposition and the reac...
Article
An efficient rhodium(III)-catalyzed tandem three-component reaction of imines, alkynes and aldehydes through CH activation has been developed. High stereo- and regioselectivity, as well as good yields were obtained in most cases. The simple and atom-economical approach offers a broad scope of substrates, providing polycyclic skeletons with potentia...
Article
The temporal release of K from single pinewood particles of four different initial masses (20–50 mg) in a Hencken burner was measured in-situ by laser-induced break down spectroscopy (LIBS). Particle temperature during the combustion was measured by two-color pyrometry. A calculation method was developed to determine the K release flux across the p...
Article
Full-text available
A model was established for particles collected by a single droplet in the wet flue gas desulfurization scrubber, considering impaction, interception, Brownian diffusion, thermophoresis and diffusiophoresis. The influence of temperature, droplet diameter and particle size on the capture process and efficiency was analyzed based on the results of nu...
Conference Paper
Full-text available
Field measurement results on the particulate matter emissions from coal-fired power plants show that wet flue gas desulfurization (WFGD) devices can synergistically remove over forty percent of particulate matter from flue gas. Researches on particles scrubbed by spray of desulfurization slurry can serve to further enhance the removal of WFGD equip...
Article
The influence of Fe2O3 on the SNCR deNOx process was investigated in a fixed-bed reactor. The experimental results demonstrated that Fe2O3 has an inhibitory effect on the SNCR deNOx process that is more notable at low temperatures. Interactions between Fe2O3 and NH3, Fe2O3-catalyzed NH3 oxidation, and NO reduction by NH3 were studied experimentally...
Article
The evolution of rice straw char reactivity during reaction with NO was examined in differential reactor at 900 and 1000 °C. Original and acid-washed rice straw chars were used. Surface area and mineral content of char samples with different conversion were analyzed. The reactivity of the acid-washed char increased until conversion X=20%, remained...
Article
Full-text available
This study investigated the influence of precipitators and wet flue gas desulfurization equipment on characteristics of PM2.5 emission from coal-fired power stations. We measured size distribution and removal efficiencies, including hybrid electrostatic precipitator/bag filters (ESP/BAGs) which have rarely been studied. A bimodal distribution of pa...
Article
Propanol, n-decane, and diesel droplets were selected as experimental samples to study combustion behavior of fuel droplets in a vertical electric field under gravity. A high speed camera was used to measure the combustion flame and droplet size, with laser-induced incandescence (LII) applied to determining soot volume fractions. The results show t...
Article
Full-text available
This study focused on the evaporation and conversion process of urea aqueous solution droplet and the process characterization in the temperature range for selective non-catalytic reduction (SNCR). An in-situ observation system was built to study the evaporation and conversion of urea aqueous solution droplet. Based on the analysis of droplet photo...
Article
Full-text available
A lab-scale hybrid particulate collector was built. Seven types of perforated plates with different opening rates, shapes and arrangementsof holeswere used in the experiments to study their performance on particulate collection. The results show that opening rate, shape and arrangement of holeshave little influence on voltage-current characteristic...
Article
The influence of calcium-based particles on the selective non-catalytic reduction (SNCR) process was investigated in a drop tube furnace reactor; the tests under different temperatures (600~1100°C), normalized stoichiometric ratio (NSR) of NH3/NO (0.5~2.0) and O2 concentrations (0.5%~5.0%), with ammonia and urea as reducing agents, were considered....
Article
In this study, a new quantitative Na LIBS detection system, which was able to provide linear calibration curve, was established. In this system, the calibration experiment was performed by seeding a nebulized mist of NaCl droplets into the flat flame using methane as the carrier gas. By changing the flow rate of the carrier gas, the concentration o...
Article
This paper presents experimental results for combustion behavior of N-decane droplet in vertical direct current electric field. Applied electric field intensities range between 0 and 150 kV/m. The ambient gas is air at atmospheric pressure and room temperature, high-speed CCD camera and laser-induced incandescence (LII) technology are used to recor...
Article
Full-text available
In this paper, by adopting the laser-induced incandescence (LII) on soot volume fraction measurement method, and by using high speed camera to measure combustion flame and droplet size, the combustion behavior of n-decane droplet in vertical electric field in gravity field is studied. The experimental results show that, when V>0, as voltage increas...
Article
Full-text available
Effects of temperature and four acids (HNO3, HNO3/H2O2, HNO3/HF and HNO3/HF+H3BO3) on the coal decomposition by microwave digestion and the multi-element analysis were studied. SARM20 was used as a coal standard reference material. The contents of 10 mineral elements (Al, Ca, Fe, Mg, K, Na, S, Si, Sr and Ti) in the coal SARM20 were determined by in...