0086-21-58386256
DOI: 10.1016/j.jece.2022.108653 Corpus ID: 252549033; Investigation on self-sustained combustion, NOx emissions, and ash characteristics of coal slime in a lab-scale fluidized bed
Production of clean pulverized coal for boiler combustion heating and power supply. Fineness: 200 mesh, D80-90, according to the needs of back-end combustion Suitable coal types: bituminous coal, anthracite, blue carbon, etc. The production of clean pulverized coal is used for boiler combustion heating and power …
Preparation Plant, the coal slurry was dried to make dry coal slime. After that, the ultra-pure water was used with a resistivity of 18.25 MΩ×cm to make coal slurry with a concentration of 80 g/dm3 in a 300 cm3 capacity beaker, and stirring for 5 minutes to mix the coal slime particles with ultra-pure water.
combustion intensification for blended coal in rotary cement kiln. Fuel 2001, 80, 1645-1650. Figure 1. Abridged general view of modern dry process cement rotary kiln system. Cement Rotary Kiln Coal Combustion Energy & Fuels, Vol. 20, No. 6, 2006 2351
bituminous coal with a heating value (HHV) of 11,380 Btu/lb. The coal's ultimate analysis is shown in Figure 1. The original fuel system consisted of three spring-loaded, type, vertical spindle mills, each gravimetric belt feeder, seal air fan, 1800 rpm primary air fan, and four mill outlets supplying pulverized coal to one of the three
With increased awareness of the large-scale CO 2 emissions from the cement industry, there has been growing focus on greenhouse gas reduction strategies. Among all these strategies, fuel substitution using biomass fuel is extensively used to achieve CO 2 zero-emission in cement production. Due to the avoidable high …
More than 70% of run-of-mine coal is enriched. At the same time, typical coal processing waste (slime, flotation waste, mid-coal and tailings) make up at least …
Coal slime can be disposed in quantity and fully utilized in a well-designed circulating fluidized bed (CFB) boiler, but the nitrogen oxides (NOx) and sulphur dioxide (SO2) emissions generated in the combustion of coal slime have contributed to serious atmospheric pollution. High Temperature & Post-combustion Technology, a novel and …
The pulverized coal particles fire gradually during the downward movement. When reaching the central zone of the furnace, they turn and move upward due to the effects of the D, E and F secondary air flows. ... Fuel Processing Technology, 89 (12) (2008), pp. 1297-1305. View PDF View article View in Scopus Google Scholar [4] J.-R. …
Characteristics of pulverized coals have significant influence on the spontaneous combustion and explosion processes. This paper presents an experimental and theoretical framework on physico-chemical characteristics of coal and their interrelations from spontaneous combustion and explosion perspectives. The chemical …
Pulverized coal (PC) combustion is presently the system of choice for coal-fired power-generating plants. In PC combustion, the coal is dried and is ground to a specified fineness, with a maximum particle size of 250–300 μm, depending on the reactivity of the coal.
Before going into the details, let us look at the quantity of coal processed in a power plant. A 2000 MW power station could be handling coal in the range of 1600 tons/hr or around 12 million tons of coal annually.
This paper presents the monitoring of the oscillatory characteristics of pulverized coal flames using image processing and spectral analysis techniques. The instrumentation system employed in this ...
Coal processing by-products mainly include coal gangue and coal slime. The presence of a variety of impurity phases (clays, quartz, pyrite, etc.) in mined coals requires extensive …
High temperature air combustion is a prospecting technology in energy saving and pollutants reduction. Numerical simulation on pulverized coal combustion and NOx emissions in high temperature air from circulating fluidized bed was presented. The down-fired combustor, taken as the calculation domain, has the diameter of 220 mm and …
Pulverized coal injection (PCI) is a special process used in blast furnaces in which pulverized coal is preheated. However, there are few studies on the application of this technology in industry.
Prediction Method for Coal Slime Blending Circulating Fluidized Bed Units. Appl. Sci. 2022, 12, 6652. ... China is advocating coal washing and quality improvement processing as well as promoting coal energy low-carbon development. ... the size range of pulverized coal particles is 0~12 mm, d50 = 1.1 mm, and the size range of limestone particles ...
Compared with traditional combustion, the difference of physical properties between CO 2 and N 2 makes the ignition of pulverized coal unstable in oxy-fuel combustion [43].The oxygen concentration had been tried to be increased [29, [44], [45], [46]] to improve the ignition performance.Based on this idea, Niu et al. [28] believed that …
DOI: 10.1016/JBUSTFLAME.2018.05.004 Corpus ID: 103396958; Ignition and combustion behaviors of single coal slime particles in CO2/O2 atmosphere @article{Zhou2018IgnitionAC, title={Ignition and combustion behaviors of single coal slime particles in CO2/O2 atmosphere}, author={Kun Zhou and Qizhao Lin and Hongwei Hu …
The coal components were coking bituminous coal from the Berezovskoe deposit (Kemerovo region, Russia) and coal slime was derived from the processing of coal of the same rank. Coal components were first ground in a rotor mill and riddled to obtain a fine powder with a particle size of no more than 100 m. This pulverized …
Section snippets General assumptions. In the narrow wavelength range of visible region, from 380 to 780 nm, the 3D system of pulverized coal combustion in a furnace is assumed to be filled by a gray emitting, absorbing, and scattering gas-particle mixture, surrounded by gray water-wall surfaces.For processing a flame image in the …
Each type of raw coal was ground with a medium-speed pulverizer and sieved to 0–50, 50–100, and 100–150 μm separately.Only the size range of 0–50 μm was used here, with the 90% cut size of 48 μm and mean particle diameter (d 50) of 20 μm. The other two size ranges would be used in the future to investigate the effects of particle size on …
Exhaust gas temperature in coal-fired power plants can reach approximately 120 °C to 140 °C, with the thermal energy accounting for approximately 3% to 8% of the total input energy.
Pulverized coal ignition becomes possible when methane concentration exceeds 1.25 vol% [48]. The ignition of a mixture of methane, air, and coal dust includes two stages: methane ignition and coal dust ignition. ... Coal slime, which is a typical coal processing waste, can be a good candidate, provided that its low calorific value is ...
The combustion of pulverized coal is far more complex than that of methane and biomass due to its complex physical and chemical properties [29], [30], and hence the measurement of the stability of a pulverized coal flame is more challenging. ... The image processing software processes the images and derives quantified flame stability ...
Nitrogen oxides, being the second most toxic combustion product of pulverized coal fuel, turn to HNO 3 in the air and are the most common component of …
images. The image processing methods are then used to extracted features of the PCI and particles. As shown in Fig. 3, a raceway image is composed of three parts that are pulverized coal cloud, raceway, and background consisting of the inner wall and coal lance. In this work, the target is to obtain the pulverized coal cloud
In [11], [12], a novel instrumentation system for on-line, in situ visualization of 2D/3D temperature distributions in large-scale pulverized-coal-fired boiler furnaces developed by the authors has been applied in three tangentially fired boiler furnaces.Using the instrumentation system, the experiments to measure the flame emissivity and …
Research on the co-pyrolysis of coal slime and lignin based on the combination of TG-FTIR, artificial neural network, and principal component analysis. ... A modeling approach to co-firing biomass/coal blends in pulverized coal utility boilers: Synergistic effects and emissions profiles. Energy 2017, 120, ... Fuel Processing Technology 2016 ...
Nitrogen oxides, being the second most toxic combustion product of pulverized coal fuel, turn to HNO 3 in the air and are the most common component of acid rains . ... (Kemerovo region, Russia) and coal slime was derived from the processing of coal of the same rank. Coal components were first ground in a rotor mill and riddled to …
Research on the co-pyrolysis of coal slime and lignin based on the combination of TG-FTIR, artificial neural network, and principal component analysis. ... A modified …
The flame image processing and analysis system has been investigated for the optimal pulverized coal firing of thermal power plant, especially for lower nitrogen oxide generation and more safe ...
Fuel Processing Technology 91(1):88-96; DOI: ... Cofiring Coal Slime with Anthracite in a Down-Fired Utility Boiler: Experimental and Numerical Investigations ... The pulverized coal was dried at ...
In this study, coal slime was mainly utilized to conduct experiments on a 30 kW preheating combustion test rig to analyze the conversion pathway of sulfur during the experiment, aiming at reducing slime pollution, controlling sulfur emission reasonably, and providing theoretical support for the preheating combustion technology. The results …
It has been established that the use of slurry fuels makes the anthropogenic emissions 2–4 times lower than from the combustion of coal slime. For example, the CO 2 emissions from the combustion of dry coal slime were 2.5–3.7 times higher than from the combustion of slurry fuels. In addition, the combustion of slurry fuels made it possible ...
A semi-empirical NO x model for LES in pulverized coal air-staged combustion. Fuel, 2019, 241(4): 402–409. Google Scholar Chen D, Zhang Z, Li Z, Cai N. Online deposition measurement and slag bubble behavior in the reduction zone of pulverized coal staged combustion. Proceedings of the Combustion Institute, 2019, …
DOI: 10.1016/J.FUPROC.2006.11.010 Corpus ID: 93288174; Performance of an entrained-flow gasification technology of pulverized coal in pilot-scale plant @article{Guo2007PerformanceOA, title={Performance of an entrained-flow gasification technology of pulverized coal in pilot-scale plant}, author={Xiaolei Guo and Zhenghua …
This article describes an experimental study on NOx emissions in pulverized coal combustion after preheating and air staging. The process takes place in two stages: the pulverized coal is first preheated in a circulating fluidized bed, and then the resulting fuel gas and char particles are burned in a down-fired combustor under air …
Fuel Processing Technology, 87 (2006), pp. 775-781. View PDF View article View in Scopus Google Scholar [27] ... Ash liberation from included minerals during combustion of pulverized coal: the relationship with char structure and burnout. Energy & Fuels, 13 (1999), pp. 1197-1202. View in Scopus Google Scholar [31]