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average concentration of nitrogen oxides decreased from 480 to 273 mg/m3 Many works of literature have studied the combustion behavior of coal and evaluated the relative combustion performance of coal However the effectsof different heating rates on the combustion behavior of pulverized coal in
·Background Pulverized coal detection is an indispensable detection measure in the coal industry The current detection devices can be divided into two types invasive and non invasive The coal dust detection methods and devices based on acoustics optics and electricity have been extensively studied In order to achieve a high efficiency online detection
·The ignition behavior of pulverized coal particles at high carbon dioxide concentration was studied by using visible light spectrum diagnostic technology Based on the transient single particle ignition model the effects of different physicochemical properties of carbon dioxide on heterogeneous and homogeneous ignition were analyzed
·When the particle size pulverized coal is 200 mesh the peak pressure reaches the highest value The flame propagation characteristics are similar at different concentrations of pulverized coal and the maximum appears at 333 g/m 3 In addition the peak temperature of the pulverized coal flame increases with the increasing of the proportion of
： The influence of pulverized coal irregularity on acoustic attenuation is investigated the relationship among the ultrasonic attenuation the volume fraction and size of pulverized coal is established and the theoretical dependence of retrieved pulverized coal volume fraction and particle size is formed with experimental data The signal excitation of superposed wave is
·Previous research has provided strong evidence that CO 2 and H 2 O gasification reactions can provide non negligible contributions to the consumption rates of pulverized coal pc char during combustion particularly in oxy fuel environments Fully quantifying the contribution of these gasification reactions has proven to be difficult due to the dearth of knowledge of
·However pressure could switch the ignition mechanism of pulverized coal Ying et al 2016 investigated the influence of coal rank system pressure oxygen concentration and coal char structure on the ignition characteristics of coal under O 2 /CO 2 atmosphere The results suggested that the ignition temperature appeared to have an
·In this study air staged combustion experiments of pulverized coal were carried out using a ddown fired furnace the effects of furnace temperature air staging degree and injection position of the burnout air on the formation pattern of NO and N 2 O were preliminarily explored the macroscopic patterns of changes in the concentration of the components inside
·The N conversion in pulverized coal combustion can be divided into three stages 1 the generation of NOx pyrolysis precursor 2 the oxidization of volatile N/char N into NO and 3 the reduction of the generated NO by char Use the flue gas analyzer to measure the oxygen concentration and NO concentration in real time and record the time
The pulverized coal mass concentration in the primary air system of a thermal power plant directly affects the combustion and power generation efficiency of the furnace making it a crucial parameter for stable boiler operation However the measurement on pulverized coal mass concentration in the primary air flow still faces challenges in terms of accuracy due to issues
·Figure 10 depicts typical original measurement and fused velocities along with the WMA C C and rms charge level as a function of time for pulverized coal under an air velocity of approximately 16 m s −1 The arc shaped sensor arrays A C were selected as the measuring electrodes and the volumetric concentration of coal particles was %
·Effect of oxy fuel combustion with different O 2 /CO 2 fractions on the pulverized coal combustion mechanism and heat transfer characteristics in rotary kilns A numerical simulation study With the increase in primary air oxygen concentration the position of pulverized coal ignition point remains basically unchanged The isothermal zone
·Abstract The pulverized coal flow in the two phase gas solid is monitored based on the ECAH Epstein Carhart Allegra Hawley theoretical model The relationship between the volumetric concentration of the pulverized coal and the ultrasound attenuation coefficient is analyzed The flow velocity and concentration of the coal particles is measured using two
·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 on this idea Niu et al [28] believed that 10% oxygen
·With the increase of pulverized coal concentration the downward trend of pulverized coal ignition delay time was consistent with the upward trend of flue gas temperature which illustrated that the combustion stability of coal and ammonia gas solid fuel was improved Therefore self sustaining preheating combustion plasma assisted combustion
·During thermal power coal fired boiler operation it is very important to detect the pulverized coal concentration in the air pipeline for the boiler combustion stability and economic security
Dense phase pulverized coal concentration is a key performance indicator for the operation of pulverized coal boiler In this paper terahertz time domain spectroscopy is applied to the quantitative analysis of pulverized coal concentration To improve the stability and accuracy of terahertz spectrum quantitative analysis of pulverized coal
Within 50 225 g/m3 of pulverized coal concentration range the explosion intensity increases with increasing concentration The smaller the particle size of pulverized coal the greater the
A novel microwave based detection system with a sensor structure of 16 electrode ring sensor that can alternate between transmitting and receiving states via a switch matrix that can effectively detect the concentration of pulverized coal under complex coal airflow conditions is proposed Conventional concentration sensors have severe limitations in terms of detection accuracy and
·As above we can see the pulverized coal concentration in the operation of the power plant is generally within the range of kg/kg to kg/kg so the two groups with dielectric constant between and were selected corresponding to the pulverized coal
·The influence of pulverized coal irregularity on acoustic attenuation is investigated the relationship among the ultrasonic attenuation the volume fraction and size of pulverized coal is
·This concentration variation is related closely to the oxygen deficient combustion of pulverized coal and further oxidization of the produced CO species At a burner angle of 15° a certain amount of CO species was produced because of the pulverized coal combustion
