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Volatile Releasing Characteristics of Pulverized Coals under Moderate or Intense Low-Oxygen Dilution Oxy-Combustion Conditions in a Flat-Flame Assisted Entrained Flow Reactor
| Content Provider | MDPI |
|---|---|
| Author | Huang, Xiaohong Hu, Fan Liu, Weilong Wang, Peng Sun, Heming Liu, Zhaohui |
| Copyright Year | 2022 |
| Description | There has been little research on volatile releasing characteristics of pulverized coals under moderate or intense low-oxygen dilution (MILD) oxy-combustion (MO) conditions. For the first time, volatile releasing characteristics of bituminous coal and semi-anthracite under both MILD air-combustion (MA) and MO conditions were investigated using a flat-flame assisted entrained flow reactor. Both heating rate $(~10^{5}$ K/s) and residence time (65 ms) were carefully selected to mimic the conditions in typical industrial boilers. The combustion processes and properties of the volatiles were characterized through direct observation and char analysis. The results showed that the lower diffusion rate of the volatile in $CO_{2}$ resulted in the decreasing of the volatile envelope flame size and a longer volatile burnout time (more than 20%). For bituminous coal (volatile content of 25%), the lower amount of apparent volatile yield under MO conditions reduced the heating value of the volatile. For semi-anthracite coal (volatile content of 7%), the short devolatilization time led to $char-CO_{2}$ gasification reaction, which increased the apparent volatile yield and the heating value of the volatile by 47% and the volatile-N by 19%. This paper indeed provided new insight into the MILD oxy-combustion of solid fuels. |
| Starting Page | 358 |
| e-ISSN | 22279717 |
| DOI | 10.3390/pr10020358 |
| Journal | Processes |
| Issue Number | 2 |
| Volume Number | 10 |
| Language | English |
| Publisher | MDPI |
| Publisher Date | 2022-02-13 |
| Access Restriction | Open |
| Subject Keyword | Processes Mild Oxy-combustion Oxy-fuel Combustion Volatile Releasing Coal Devolatilization |
| Content Type | Text |
| Resource Type | Article |
