WeChat Mini Program
Old Version Features

Generation Patterns and Mechanistic Interpretation of PAHs During High-Temperature Reaction Processes of Coal: A Case Study of Shuozhou Long-Flame Coal

FUEL(2025)

Jiangsu Ocean Univ | Huayang New Mat Technol Grp Co Ltd

Cited 0|Views4
Abstract
In order to prevent gas pollution caused by coal spontaneous combustion, the functional group changes of coal and the release patterns of 16 polycyclic aromatic hydrocarbons (PAHs) generated during pyrolysis and combustion processes were investigated, along with an in-depth exploration of their formation mechanisms. The results indicate that reaction temperature and oxygen supply conditions have significant impacts on the changes in coal functional groups and are the main factors determining PAHs yields. With the rise of temperature, the generation of PAHs continuously increases during pyrolysis, reaching a maximum value at 700 degrees C (6554.11 mu g/ g); while during combustion, the generation of PAHs initially increases and then decreases, reaching a maximum value at 600 degrees C (970.58 mu g/g). Furthermore, the temperature rise can drive the transformation of low-ring PAHs to high-ring PAHs in both reaction processes, accompanied by an increase in toxicity. Additionally, during combustion, adequate oxygen supply leads to the decomposition and scattering of hydrocarbon small molecules, significantly reducing the generation of PAHs; the generation of PAHs during pyrolysis is 5.93 to 12.52 times higher than that during combustion. Based on the changes of functional groups, it shows that during pyrolysis, C=C bonds and Ar-CH groups exhibit a significant correlation with the generation of PAHs, as aromatic hydrocarbons continuously detach from the coal to form PAHs, resulting in an increasing trend in PAHs content. Conversely, during combustion, C-O bonds and C=C bonds show a strong correlation with PAHs, as the formation and decomposition of complexes and transitional groups formed during coal-oxygen reactions lead to an initial increase followed by a decrease in the content of C-O bonds, with PAHs exhibiting a similar trend. Structural changes in PAHs reveal that their growth and reduction primarily occur through various oxidation and addition reactions at locally active structures within PAHs.
More
Translated text
Key words
Polycyclic Aromatic Hydrocarbons,Pyrolysis,Combustion,Functional Groups,Grey Relational Analysis
求助PDF
上传PDF
Bibtex
AI Read Science
AI Summary
AI Summary is the key point extracted automatically understanding the full text of the paper, including the background, methods, results, conclusions, icons and other key content, so that you can get the outline of the paper at a glance.
Example
Background
Key content
Introduction
Methods
Results
Related work
Fund
Key content
  • Pretraining has recently greatly promoted the development of natural language processing (NLP)
  • We show that M6 outperforms the baselines in multimodal downstream tasks, and the large M6 with 10 parameters can reach a better performance
  • We propose a method called M6 that is able to process information of multiple modalities and perform both single-modal and cross-modal understanding and generation
  • The model is scaled to large model with 10 billion parameters with sophisticated deployment, and the 10 -parameter M6-large is the largest pretrained model in Chinese
  • Experimental results show that our proposed M6 outperforms the baseline in a number of downstream tasks concerning both single modality and multiple modalities We will continue the pretraining of extremely large models by increasing data to explore the limit of its performance
Upload PDF to Generate Summary
Must-Reading Tree
Example
Generate MRT to find the research sequence of this paper
Data Disclaimer
The page data are from open Internet sources, cooperative publishers and automatic analysis results through AI technology. We do not make any commitments and guarantees for the validity, accuracy, correctness, reliability, completeness and timeliness of the page data. If you have any questions, please contact us by email: report@aminer.cn
Chat Paper
Summary is being generated by the instructions you defined