Coal with improved combustion properties

a technology of combustion properties and coal, applied in the petroleum industry, liquid carbonaceous fuels, solid fuels, etc., can solve the problems of low thermal efficiency, achieve the effects of improving carbon burnout, reducing carbon content in ash, and reducing activation energy for oxidation

Inactive Publication Date: 2009-11-12
AQUAFUEL RES LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0011]According to a first aspect of the present invention there is provided a method for improving the combustion properties of a coal, the method comprising treating said coal with a metal porphyrin.
[0013]We have found that the invention can provide improved carbon burnout, resulting in reduced carbon content in the ash. The activation energy for oxidation may also be reduced. NOx formation in combustion is related to the excess of air over the stoichiometric requirement: more excess means higher NOx and lower thermal efficiency. Improved rates of combustion / lower activation energy tends to reduce excess air requirement and lower NOx production. The combustion chamber airflow is typically actively managed and can be altered to optimise combustion conditions to minimise carbon content in ash and minimise NOx.

Problems solved by technology

NOx formation in combustion is related to the excess of air over the stoichiometric requirement: more excess means higher NOx and lower thermal efficiency.
Improved rates of combustion / lower activation energy tends to reduce excess air requirement and lower NOx production.

Method used

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  • Coal with improved combustion properties
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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0027]Iron (II) phthalocyanine (0.1-0.2 g) was dissolved in concentrated sulphuric acid (50-60 ml). A sample of brown coal (˜2 g) (2-3 mm grain size) was stirred in this solution for 2 hours at room temperature and left overnight to soak. After stirring, the coal with the deposited phthalocyanine was filtered off. The residual concentration of iron (II) phthalocyanine was determined by UV / visible spectrophotometric analysis. The quantity of the deposited iron-based additive was determined by the difference in concentrations of the starting and residual solutions. The filtered coal was washed with water to neutral pH and air-dried to constant weight over 72-144 hours. Calculations showed that 0.2% of iron (II) phthalocyanine was deposited on the coal. This corresponds to about 200 ppm of iron. After drying, the sample of coal was ground to dust in a mortar for DTA / DTG analysis.

[0028]Comparative measurements were made on untreated (‘neat’) brown coal and on brown coal treated under th...

example 2

[0042]As for Example 1 but using cobalt phthalocyanine disulphonate as the metal porphyrin and distilled water instead of sulphuric acid as the fluid carrier.

[0043]Results are shown in FIGS. 7-11.

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Abstract

A method for improving the combustion properties of a coalcomprises treating said coal with a metal porphyrin. The invention also provides a coal having a metal porphyrin deposited thereon, and a method of producing heat, comprising combusting the coal.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to a method for improving the combustion properties of a coal, to a coal with improved combustion properties, and to a process for combustion of a coal with reduced emissions.[0003]2. Description of the Prior Art[0004]Incomplete combustion in coal fired furnaces results in carbon being retained in ash, and limits the efficiency of coal fired plant. The carbon in ash contributes to the overall ash emission, reduces the efficiency of electrostatic precipitators for ash removal, and makes the ash less easy to dispose of, for example as a component for cement.[0005]Many coal-fired power plants, including Russian and Chinese plants, are using low-grade coals with low reactivity. The main challenges faced when firing these grades of coal are:[0006]High carbon content in the fly ash: up to 15-20%;[0007]Significant NOx emission.[0008]The high content of unburned carbon in the fly ash results in the...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): C10L5/00
CPCC10L9/10C10L1/301
Inventor DAY, PAUL G.SIROVSKI, FELIXDAUT, SERGEJ
Owner AQUAFUEL RES LTD
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