Reactivity and kinetics of furfural residue air gasification based on-line gas releasing behaviors in a bubbling fluidized bed

Combustion and emission behavior of 100 % steam coal (SET 1) and a mixture of 80 % by weight steam coal and 20 % by weight local lignite, characterized by high sulfur and ash contents, (SET 2) were investigated in the 0.3 MWt Middle East Technical University (METU) Atmospheric Bubbling Fluidized Bed Combustor (ABFBC) Test Rig. Experiments were performed with limestone addition at various Ca/S molar ratios with fines recycle. In both sets of experiments, parameters other than Ca/S molar ratio were held as nearly constant as possible. On-line measurements of O2, CO2, CO, SO2, NOx emissions were carried out. Comparisons between the emissions show that lower NOx and SO2 emissions are obtained from combustion of steam coal/lignite mixture compared to those from steam coal only despite higher sulfur and almost equal nitrogen contents of the mixture. Calculated combustion efficiencies were found to be around 98 and 96 % for SET 1 and SET 2, respectively. As for the sulfur retention efficiencies, up to three times higher efficiencies were achieved when steam coal is co-fired with high sulfur lignite.

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99/00674 The kinetics of gasification and combustion of various wastes, biomasses, and coals in the bubbling fluidized bed

Fuel and Energy Abstracts ◽

10.1016/s0140-6701(99)92947-8 ◽

1999 ◽

Vol 40 (1) ◽

pp. 67

Keyword(s):

Fluidized Bed ◽

Bubbling Fluidized Bed ◽

Kinetics Of

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The Gasification of Sewage Sludge in Bubbling Fluidized Beds

17th International Conference on Fluidized Bed Combustion ◽

10.1115/fbc2003-070 ◽

2003 ◽

Author(s):

A. T. Harris ◽

S. A. Scott ◽

J. S. Dennis ◽

A. N. Hayhurst ◽

J. F. Davidson

Keyword(s):

Sewage Sludge ◽

Fluidized Bed ◽

Low Rank ◽

Municipal Sewage ◽

Low Rank Coal ◽

Exponential Factor ◽

Bubbling Fluidized Bed ◽

Fluidized Bed Gasifier ◽

The Uk ◽

Kinetics Of

This paper gives the first measurements from a project investigating the gasification of dried sewage sludge in a laboratory scale, bubbling fluidized bed at atmospheric pressure. The aim of the work was to examine the reactions occurring in a fluidized bed gasifier rather than simply treat the reactor as a ‘black box’. Experiments were performed to investigate the rates of drying, devolatilisation, gasification and combustion. Thermogravimetric analysis, as well as batch fluidized bed experiments using mechanically dewatered, dried and pelletised municipal sewage sludges from different regions in the UK were performed. A comparison was made between the different samples of sludge and a low rank coal and softwood biomass. A distributed activation energy model (DAEM) for interpreting the kinetics of devolatilisation was also investigated. The model was able to reduce the results from several TGA experiments to a single curve characterised by a single parameter, the pre-exponential factor, A.

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On line diagnostics and self-tuning method for the fluidized bed temperature controller

Archives of Thermodynamics ◽

10.1515/aoter-2016-0003 ◽

2016 ◽

Vol 37 (1) ◽

pp. 31-46

Author(s):

Jan Porzuczek

Keyword(s):

Fluidized Bed ◽

Experimental Verification ◽

Experimental Studies ◽

Statistical Process ◽

Temperature Controller ◽

Tuning Method ◽

Bed Temperature ◽

Bubbling Fluidized Bed ◽

Self Tuning ◽

On Line

Abstract The paper presents the method of on-line diagnostics of the bed temperature controller for the fluidized bed boiler. Proposed solution is based on the methods of statistical process control. Detected decrease of the bed temperature control quality is used to activate the controller self-tuning procedure. The algorithm that provides optimal tuning of the bed temperature controller is also proposed. The results of experimental verification of the presented method is attached. Experimental studies were carried out using the 2 MW bubbling fluidized bed boiler.

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