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Measurement for pulverizedcoal concentration is important to the safe and economic operation in power plant. This paper presents an online measurement system for pulverizedcoal concentration based on the method of ultrasonic attenuation in the gassolid two phase flow.
The assumptions are: the concentration of coal powder in the corridor is 2kg/m3, the dust cloud fills the entire corridor area, and the location of the ignition source is at the top left of the gallery. FLACSDustEx Simulation of Hebei Caofeidian Pulverized Coal Accident .
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 concentration of 30% and the pulverized coal concentration of 50%.
A new technology based on pulverized coal preheated by CFB was proposed, which could achieve stable flameless combustion, high combustion efficiency, and low NOX emission of pulverized coal. Experiments were conducted on a benchscale rig of pulverized coal combustion preheated by CFB to study the flameless combustion behavior.
11/12/2019· In this study, injection method of the ammonia into the pulverized coal fired boiler was investigated experimentally and numerically. And it succeeded to reduce the NO concentration to be in the same degree with the conventional boiler.
The invention relates to an integrated pulverized coal separation and concentration device of a pulverizedcoal boiler, which comprises an axial type coarse pulverized coal separator of which the bottom is connected with a coal mill (1) by a pulverized coal return pipe (16) and the top is connected with a tangential extraction axial type pulverized coal concentrator; the coarse pulverized coal
A pulverized coal distributor and a gasparticle flow adjustment device provided on an upstream side of the pulverized coal distributor and at a bottom in a pulverized coal pipe to adjust pulverized coal to branch pipes in concentration are provided, the gasparticle flow adjustment device comprises a plateshaped member provided along a
Abstract: During thermal power coalfired boiler operation, it is very important to detect the pulverized coal concentration in the air pipeline for the boiler combustion stability and economic security. Because the current measurement methods used by power plants are often involved with large measurement errors and unable to monitor the pulverized coal concentration in realtime, a new method
Under the various O 2 concentration conditions, blending of less than 50% of CM did not affect the overall combustion situation of pulverized coal. At the same time, the combustion characteristic of CM/SX blends with less than 50% CM had no apparent gap in the three types of O 2 concentration
behavior of pulverized coal in highly preheated air/ steam mixture. The temperature of air/steam mixture was heated up to 1150 ºC, with the steam concentration ranging from 0% to 44% of mass fraction. The flow rate of pulverized coal was 5 kg/h, and the injecting velocity varied from 9m/s to 30 m/s. In order to investigate the influence of nozzle
Abstract: This paper presents a novel instrumentation system for the concurrent measurement of temperature and soot concentration of pulverized coal flames. The system operates on the twocolor principle, combining CCD camera optical sensing and digital
Pulverized coal firing boilers are widely used in power plants. Coal is pulverized into very fine particles and then mixed with primary air in horizontal pipes in the case of exhaust pneumatic convey system. The pulverized coal particles are conveyed by primary air to the burner and burn in the furnace. The concentration of pulverized coal in primary air should be well controlled to keep the
12/14/2018· However, as increasing cofiring rate to 15 and 20%, NOx concentration also increased, and the concentration at cofiring rate of 20% was approximately 20% higher than that at single coal combustion. This indicates that fuel NOx was produced in the flame by the oxidation of ammonia, or combustion of pulverized coal was aggravated, and then it
In a pulverized coalfired boiler of a large power plant, an oxygen analyzer is essential for combustion control. Exhaust gases from the pulverized coal boiler contain a large quantity of dust and flow very fast. Oxygen analyzers that employ a sampling method may be subject to wear or clogging, resulting in increased maintenance workload and cost.
GM Highconcentration Pulverized Coal Bag Collector. Category: Filter Bag House. Share: Description; Reviews (0) Main Characteristics: High dust collecting efficiency. The collector can directly collect dust from gas with dust concentration of thousands of grams to tens of thousands of grams per m3. The emission concentration is far lower than
During thermal power coalfired boiler operation, it is very important to detect the pulverized coal concentration in the air pipeline for the boiler combustion stability and economic security. Because the current measurement methods used by power plants are often involved with large measurement errors and unable to monitor the pulverized coal
4/12/2011· This technology is capable of enriching the CO2 concentration and then allowing CO2 sequestration in an efficient and energysaving way. To study the operation characteristics of the oxycombustion process, an 800 MWe oxycombustion pulverizedcoalfired power plant was simulated and analyzed using the commercial flowsheet software Aspen Plus.
Kang, ZhiZhong, and Sun, BaoMin. "Numerical Simulation of the Effects of Pulverized Coal Concentration on Coal Ignition by High Temperature Air." Proceedings of the ASME 2008 International Mechanical Engineering Congress and Exposition. Volume 3: Combustion Science and Engineering. Boston, Massachusetts, USA.
The high temperature air combustion (HiTAC) is an advanced promising technology for heat recovery, energy saving, and stability improvement of flame. Computational fluid dynamic (CFD) is known as an applied tool to execute HiTAC modeling. In this paper, performances of pulverized coal combustion under the high preheated and oxygen deficient air are studied by both experimental and numerical
pulverized coal was aggravated, and then it resulted in the increase of NO x emission. On the other hand, it was found that NO x concentration in the flue gas at 20% ammonia cofiring depended on the position of ammonia injection into the furnace. Fig. 3 shows the changes of NO x concentration against different locations of ammonia injection
Combustion Behavior of Pulverized Coal and Change of Char Structure during Combustion. Figure 3 shows the combustion ratios with sampling point distance from injector for Coals L and H. Although the O 2 concentration for Coal L was lower than that of Coal H, the combustion ratio of Coal L was higher. From this result, it is clear that the
The higher the pulverized coal concentration is, the more obvious the homogeneous reductive reactions of CO are, and the high concentration of pulverized coal is very favorable to promote the formation of the reductive gases, which contributes to the conversion of NO x to N 2.
LowNOx combustion technologies are widely applied in pulverized coalfired boilers. But it promotes the formation of high concentration of H2S, which is one of the main reasons for hightemperature corrosion. To limit the H2S formation, it is urgently necessary to reveal the evolution behavior of the sulfur species. In this work, the reaction mechanism for sulfur species was investigated
The pulverized coal flow in the twophase gassolid is monitored based on the EC (Epstein, Carhart, Allegra, Hawley) theoretical model. The relationship between the volumetric concentration of the pulverized coal and the ultrasound attenuation coefficient is analyzed.
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