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.

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

NO Emission Characteristics of Low-Rank Pulverized Bituminous Coal in the Primary Combustion Zone of a Drop-Tube Furnace

2010 ◽  
Vol 24 (6) ◽  
pp. 3471-3478 ◽  
Author(s):  
Jun Fei ◽  
Rui Sun ◽  
Leibo Yu ◽  
Jian Liao ◽  
Shaozeng Sun ◽  
...  
Keyword(s):  
Combustion Zone ◽  
Bituminous Coal ◽  
Tube Furnace ◽  
Low Rank ◽  
Emission Characteristics ◽  
Drop Tube ◽  
No Emission ◽  
Drop Tube Furnace

scholarly journals Investigation on Slagging Fouling Potential in Coal Blending for PLTU with PC Boiler with Droptube Furnace Method

2021 ◽  
Vol 2 ◽  
pp. 28-40
Author(s):  
Hariana Hariana ◽  
Fairuz Milkiy Kuswa ◽  
Dani Rudiana ◽  
Lan Marakkup Tua Naingolan
Keyword(s):  
Power Plant ◽  
Power Plants ◽  
Xrd Analysis ◽  
Drop Tube ◽  
Acceptable Risk ◽  
Drop Tube Furnace ◽  
Design Specifications ◽  
Initial Design ◽  
Direct Testing ◽  
Coal Blending

The majority of power plants in Indonesia are Coal-Fired Power Plants (PLTU) which using coal as the main fuel. The coal used in the PLTU is coal that has been adjusted to the existing PLTU design. However, coal availability according to the initial design of the PLTU is running low and even almost non-existent. If the coal does not meet the PLTU design specifications is forced to be used as fuel, various problems will arise regarding to the capability and reliability of the power plant itself. Therefore, looking for coal alternatives that have similar specifications to the PLTU design is very important, to get these alternatives can be done by Blending coal from various specifications. The Blending product must be evaluated from various aspects, one of which is slagging and fouling. This research will focus on the aspects of slagging fouling resulting from the Blending of two different coals in terms of characteristics and specifications. Evaluation is carried out by taking samples and tested to make predictions based on AAS and AFT, burning in the Drop Tube Furnace (DTF), and performing SEM and XRD analysis of two coal Blending products. The results obtained are that the A and B Blending products are in an acceptable risk for direct testing on a larger scale (PLTU) or boiler simulator. However, Blending A has a greater potential for further research than Blending product B.

Numerical and Experimental Studies on Devolatilizaton Behavior of Pulverized Coal in a Drop Tube Furnace

2019 ◽  
Vol 24 (2) ◽  
pp. 34-40
Author(s):  
Jihoon Jang ◽  
Karam Han ◽  
Geun Sil Yu ◽  
Wook Ryun Lee ◽  
HyeonSoo Lim ◽  
...  
Keyword(s):  
Experimental Studies ◽  
Pulverized Coal ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace

Reactivity Study of Two Coal Chars Produced in a Drop-Tube Furnace and a Pulverized Coal Injection Rig

2012 ◽  
Vol 26 (8) ◽  
pp. 4690-4695 ◽  
Author(s):  
Hongyu Li ◽  
Liza Elliott ◽  
Harold Rogers ◽  
Peter Austin ◽  
Yonglong Jin ◽  
...  
Keyword(s):  
Pulverized Coal ◽  
Tube Furnace ◽  
Drop Tube ◽  
Drop Tube Furnace ◽  
Pulverized Coal Injection ◽  
Coal Injection ◽  
Reactivity Study

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.

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