The investigation of combustion phenomena in pulverized coal flames is significant for combustion optimization related to energy conservation and emission reduction. Real-time two dimensional (2D) temperature and concentration distributions play an important role for combustion analysis.
In coal MILD-oxy combustion, different oxygen concentrations change the amount of flue gas and inlet velocity when the excess oxygen coefficient is fixed. ... "Novel conceptual design of a supercritical pulverized coal boiler utilizing high temperature air combustion (HTAC) technology," Energy, Elsevier, vol. 35(7), pages 2752-2760. Full ...
Measurement for pulverized-coal concentration is important to the safe and economic operation in power plant. This paper presents an on-line measurement system …
The MILD combustion experiments with pulverized coal of the reference case were performed by IFRF in a 0.58 MW scale furnace with a cross section of 2 × 2 ... The concentration of CO 2 is higher, in the case of oxy-40-V, and the contribution of gasification reaction is higher than that of oxy-50-2V. These demonstrate that increasing …
The peak NO concentration during the combustion process of corn stalk is 4.56 ×10−4, which is approximately 7 times higher than that of coal, and it is caused by the high amount of N in corn stalk. ... Yu J., Lucas J.A., Wall T.F., Formation of the structure of chars during devolatilization of pulverized coal and its thermoproperties: A ...
DOI: 10.1016/j.energy.2020.117376 Corpus ID: 216312396; Effects of oxygen concentration and inlet velocity on pulverized coal MILD combustion @article{Kuang2020EffectsOO, title={Effects of oxygen concentration and inlet velocity on pulverized coal MILD combustion}, author={Yucheng Kuang and Boshu He and …
In light of the lack of consensus and effective means for measuring pulverized coal concentration in dilute-phase pneumatic conveying, this paper proposes a microwave-based pulverized coal concentration detection system. The sensor employs multiple electrodes with freely switchable transceiving states, enabling the construction …
The pulverized coal in pneumatic pipelines of a coal-fired power plant is a typical gas–solid two-phase flow. In-line monitoring the concentration and size of …
Experimental results demonstrate the system's ability to detect and classify various pulverized coal concentrations, offering novel insights into concentration measurement of gas-solid mixtures in dilute-phase pneumatic conveying conditions.
The profiles of high flue gas temperature, proper oxygen concentration and high pulverized coal concentration after the flame stabilizing ring at the outlet of the primary air are firstly depicted to elucidate the mechanisms of coal ignition and flame stability and in-flame NOx reduction in Fig. 10. As mentioned above, pulverized coal …
Meanwhile, the tested pulverized coal concentration plus 5 g/m 3 is the lower explosion limit of pulverized coal cloud. Explosion intensity test Different concentrations. The concentration of pulverized coal was set at 50g/m 3, 80g/m 3, 125g/m 3, 175g/m 3, and 225g/m 3, respectively. The pulverized coal with the particle …
Spontaneous combustion of pulverized coal has become a safety topic and has been extensively researched. This study using differential scanning calorimetry investigated the exothermic characteristics and spontaneous combustion risk of three metamorphic pulverized coal samples during oxidative combustion, for oxygen concentrations of …
CEMS is installed that logged NOx concentration per minute basis. A coal analyzer is also incorporated into boiler operation to record coal properties per minute basis. ... to reduce the dimensionality of the data. For example, pulverized coal feeder flow rate consisted of 6 sub-process variables that were found strongly correlated with each ...
Pulverized coal fineness (PCF) is a key parameter in coal-fired power plants, demanding accurate and on-line monitoring.
The research aimed to understand the physical properties of the nanofluids in terms of surface tension and viscosity, investigate how the nanofluids affected the wettability of the pulverized coal by analyzing changes in contact angles and the WAR, explore the role of nanofluid concentrations in protecting against coal dust with …
In this study, simulations were carried out to study the combustion characteristics within a 600 MW W-shaped pulverized coal boiler under O2/N2 and O2/CO2 atmospheres. The objective of this work is to develop and validate a novel model for pulverized coal combustion under O2-enriched conditions, specifically optimized for …
The pulverized coal concentration of self-preheating burner is generally around 1.1. High pulverized coal concentration ensures that under ultra-low load, pulverized coal can be ignited more intensively, thus ensuring stable combustion. (2) A separation sleeve is designed between the primary air and the internal secondary air. ...
The two-dimensional laminar combustion characteristics of coal particles at various oxygen concentration levels of a surrounding gas have been numerically investigated. The numerical simulations, which use the two-step global reaction model to account for the surrounding gas effect, show the detailed interaction among the inter …
In this study, a discrete phase model is used to describe the complex flow and thermochemical behavior associated with the co-injection of hydrogen and pulverized coal in the raceway. The effect of hydrogen injection rate on the raceway is studied from the aspects of gas velocity, temperature, concentration distribution and coal burnout rate.
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.
The advanced development of solid fuel combustion requires the on-line monitoring of coal powder concentration in the pneumatic pipelines with dilute solid flows …
The chemical properties, morphology, bulk density, particle size, and specific surface area of pulverized coals from nine different coal subsidiaries of India are …
Pulverized coal finds applications as raw material in several process industries, wherein its physical properties, viz., bulk density, shape, size, surface texture, and moisture content play a major role. ... Li et al. investigated the influence of fuel concentration and coal particle size on multiple explosion parameters for …
Moderate and intense low-oxygen dilution (MILD) combustion is regarded as a new clean combustion mode, which can simultaneously improve combustion efficiency and decease NOx emission. The computational fluid dynamics (CFD) modeling on pulverized coal MILD combustion was conducted to simulate the flue gas velocity, …
for measuring pulverized coal concentration in dilute-phase pneumatic conveying, this paper proposes a microwave-based pulverized coal concentration detection system.
Measurement for pulverized-coal concentration is important to the safe and economic operation in power plant. This paper presents an on-line measurement system for pulverized-coal concentration ...
Hence, the projection area of the particle of pulverized coal is ( ) () Φ ∆ = t t A I I S 2 0 2 1 (7) or the average size of the particle is = D S 1 4 / p (8) and mass concentration of pulverized coal is 3 6 r W nD p = (9) Where ρ is the density of pulverized coal. 2.2 Measurement of the velocity of pulverized coal
The concentration measurement of pulverized coal in a pneumatic pipeline is a challenging issue in power plant. A thermal probe manufactured with abrasion-proof steel was developed for coal con-
Large-eddy simulation is applied to a pulverized coal flame with oxy-firing conditions. • Effect of oxygen concentration on NO x formation are investigated.. Peak value of the formed NO increases with increasing the O 2 concentration.. When equivalence ratio is larger than unity, NO decreases after its peak value.
Coal-fired power plants are one of the major sources of CO 2 emission, and the novel application of directly co-firing the carbon-free fuel ammonia into the coal-fired power plants is emerging as a promising method of CO 2 emission reduction. In this study, simulations of the boiler system of a 600 MW e coal-fired power plant unit were …
In-line monitoring the concentration and size of pulverized coal is becoming increasingly important to improve the operational safety, reduce the emission of dust …