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Thermal effects on arsenic emissions during coal combustion process
Weiqiang Zhang1, Qiang Sun2, Xiuyuan Yang3
1Key Laboratory of Coalbed Methane Resources and Reservoir Formation Process of the Ministry of Education, China University of Mining and Technology, Xuzhou, Jiangsu Province 221116, PR China; School of Resources and Geosciences, China University of Mining and Technology, Xuzhou, Jiangsu Province 221116, PR China.
The Science of the Total Environment
|September 3, 2017
Summary
Arsenic emission during coal combustion increases with temperature, especially above 700-800°C. Other factors like airflow and time have nonlinear effects, but original arsenic content is directly proportional to emissions.
Area of Science:
- Environmental Science
- Chemistry
- Combustion Engineering
Background:
- Coal combustion releases arsenic, posing risks to health and the environment.
- Understanding arsenic's volatility during combustion is crucial for mitigation.
Purpose of the Study:
- To investigate arsenic emission rates during the combustion of various coal types.
- To analyze the factors influencing arsenic release and volatility.
Main Methods:
- Examined arsenic emission rates across different coal types and combustion temperatures.
- Analyzed the relationship between arsenic emissions and factors like temperature, combustion time, airflow, and initial arsenic content.
Main Results:
- Arsenic emission rates increase with burning temperature, with a notable threshold between 700°C and 800°C.
- Combustion environment, time, temperature, and airflow exhibit nonlinear relationships with arsenic emission rates.
- Original arsenic content in coal is directly proportional to the emission rate.
Conclusions:
- Controlling factors with nonlinear relationships can minimize arsenic contamination.
- Managing original arsenic content and optimizing combustion conditions are key to reducing environmental arsenic release.
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