Ignition behaviors of pulverized coal particles in O2/N2 and O2/H2O mixtures in a drop tube furnace using flame monitoring techniques

2015 ◽  
Vol 35 (3) ◽  
pp. 3629-3636 ◽  
Author(s):  
Chun Zou ◽  
Lei Cai ◽  
Di Wu ◽  
Yang Liu ◽  
Siliang Liu ◽  
...  
Keyword(s):  
Pulverized Coal ◽  
Tube Furnace ◽  
Drop Tube ◽  
Monitoring Techniques ◽  
Drop Tube Furnace ◽  
Coal Particles ◽  
Flame Monitoring

Investigations into the ignition behaviors of pulverized coals and coal blends in a drop tube furnace using flame monitoring techniques

Fuel ◽  
2010 ◽  
Vol 89 (3) ◽  
pp. 743-751 ◽  
Author(s):  
Tianyang Chi ◽  
Hongjian Zhang ◽  
Yong Yan ◽  
Hongliang Zhou ◽  
Hang Zheng
Keyword(s):  
Tube Furnace ◽  
Drop Tube ◽  
Monitoring Techniques ◽  
Drop Tube Furnace ◽  
Flame Monitoring

scholarly journals ON SOME ASPECTS OF THE STUDY OF PULVERIZED COAL AND FUEL MIXTURES COMBUSTION IN A DROP TUBE FURNACE

2021 ◽  
pp. 119-131
Author(s):  
Yurii Stupak ◽  
Tatyana Khokhlova
Keyword(s):  
Blast Furnace ◽  
Combustion Process ◽  
Pulverized Coal ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Coal Particles ◽  
Two Component ◽  
Tube Furnaces ◽  
Fuel Mixtures

The article considers some aspects of the pulverized fuel combustion modelling in the laboratory on installations called vertical tube furnaces (referred to as drop tube furnaces in scientific periodicals). We have considered the scheme of the installation to study the process of pulverized coal (PС) combustion in conditions similar to the conditions of heating and ignition of coal particles in the blast flow of the blast furnace and their subsequent gasification in the raceway. We have formulated the basic requirements for ensuring the reliability of modelling results. We have examined the methods of combustion completeness (burnout) estimation used in similar studies. We have proposed a convenient method for the estimation of the burnout of two-component fuel mixtures. According to this method, the estimation can be performed for any ratio of components in a two-component fuel mixture with the use of data on the initial ash content in each of them and the relevant burnout. We have obtained the estimated data on the dependence of the burnout of PC (anthracite, lean coal) with fuel additives. It has been shown that the proposed approach can be used to evaluate experimental data regarding the study of the combustion completeness of fuel mixtures. It has been established that for the initial stages of PC combustion (heating, emission and ignition of volatile matters), which occur before the fuel particles enter the blast furnace raceway, the fuel mixtures burnout values recorded in the experiments do not differ significantly from the estimated ones. For the final stages of PC combustion (heating and burnout of char), which occur mainly in the raceway and outside, the combustion completeness determined in laboratory studies was significantly higher than the estimated one. The obtained results confirmed the efficiency in the use of drop tube furnace to model the PC combustion process during the fuel injection with the heated blast flow in the blast furnace raceways and study of the influence of various factors on the combustion process. The results of such studies can be used to improve the design of PC injection units in the blast furnace and to study the possibilities for improving the coal particles combustion completeness and the specific consumption of PC.

Effect of steam on ignition of pulverized coal particles in oxy-fuel combustion in a drop tube furnace

Fuel ◽  
2016 ◽  
Vol 182 ◽  
pp. 958-966 ◽  
Author(s):  
Lei Cai ◽  
Chun Zou ◽  
Yanwen Guan ◽  
Huiqiao Jia ◽  
Liang Zhang ◽  
...  
Keyword(s):  
Fuel Combustion ◽  
Pulverized Coal ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Coal Particles

A Simplified Model Accounting for the Combustion of Pulverized Coal Char Particles in a Drop Tube Furnace

2017 ◽  
Vol 31 (10) ◽  
pp. 11391-11403 ◽  
Author(s):  
Patrick Gilot ◽  
Alain Brillard ◽  
Jean-François Brilhac ◽  
Cornelius Schönnenbeck
Keyword(s):  
Coal Char ◽  
Pulverized Coal ◽  
Tube Furnace ◽  
Simplified Model ◽  
Drop Tube ◽  
Drop Tube Furnace

scholarly journals Ash Evaluation of Indonesian Coal Blending for Pulverized Coal-Fired Boilers

2021 ◽  
Vol 2021 ◽  
pp. 1-15
Author(s):  
Hariana ◽  
Adi Prismantoko ◽  
Ganda Arif Ahmadi ◽  
Arif Darmawan
Keyword(s):  
Power Plants ◽  
Calorific Value ◽  
Pulverized Coal ◽  
Tube Furnace ◽  
Low Rank ◽  
Drop Tube ◽  
Chemical Additives ◽  
X Ray ◽  
Drop Tube Furnace ◽  
Coal Blending

Coal calorific value is one of the main considerations for using coal as a power plant fuel. In addition, the requirements for indications of slagging and fouling are also important to maintain combustion efficiency. However, coal power plants often experience problems in boiler operations due to the use of certain types of coal, even though they have a relatively high calorific value. This research investigates the effect of coal blending on ash fouling and slagging in an experimental investigation using a drop tube furnace with or without additives. Five different types of coal from different locations have been used in this study. Pulverized low-rank coal samples are burned in a drop tube furnace at 1,175°C with probe temperatures of 550°C and 600°C, corresponding to the combustion chamber of 600 MW power plants, including superheater and reheater areas. The ash particles’ characteristics and material composition were also analyzed using scanning electron microscopy with energy-dispersive X-ray (SEM-EDX) and X-ray diffraction (XRD), respectively. All coal mixture combinations demonstrated potential as a fuel for power plants that use pulverized coal-fired boilers. Because of its capacity to reduce slagging and fouling potentials, combining coal blending with the use of chemical additives yielded the greatest results.

Fragmentation of large coal particles in a drop-tube furnace

Fuel ◽  
1994 ◽  
Vol 73 (8) ◽  
pp. 1365-1367 ◽  
Author(s):  
P.J. Dacombe ◽  
E. Hampartsoumian ◽  
M. Pourkashanian
Keyword(s):  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Coal Particles

Theoretical and Experimental Investigation of Micro Feeding Technology on a Drop Tube Furnace

2012 ◽  
Vol 516-517 ◽  
pp. 476-482
Author(s):  
Zheng Zhong Ma ◽  
Xiang Xu ◽  
Yun Han Xiao
Keyword(s):  
Particle Size ◽  
Flow Rate ◽  
Feeding Rate ◽  
Tube Furnace ◽  
Low Flow ◽  
Drop Tube ◽  
Interparticle Forces ◽  
Drop Tube Furnace ◽  
Coal Particles ◽  
Low Flow Rate

Coal particles are supplied to drop tube furnace (DTF) with a designed shaftless screw micro feeder. The condition of individual particles in furnace, which demands small particles size (102μm) and low flow rate for micro feeder，is desired to reaction mechanisms research. When particle size is less than 1mm, the interparticle forces such as van der Waals interactions have enormous effect on flow behavior of particles, so it is difficult to provide continuous and steady particles flow at low flow rate. In this paper, the micro feeder uses shaftless spring as its feeding element. To simulate dispersed particles flow, the feeding rate of coal particles should be decided by feeding coefficient M and is controlled by variable rotation speed of screw. The corresponding simplified model of feeding rate is presented, and interparticle forces are evaluated by the velocity coefficient . A vibrating metal rod is inserted into the middle of the shaftless screw to avoid particles agglomeration, and particle flow stability is also effectively improved. The given results show good linearity and stability of micro feeder. Moreover, the influences of the particle properties such as particle size and particle moisture content on the feeding rate are also investigated.

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