Numerical simulation on characteristics of impinging air flow propagationand CO formation in lignite explosion

LIU Tianqi

doi:10.11883/bzycj-2018-0297

Volume 39 Issue 10

Oct. 2019

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LIU Tianqi. Numerical simulation on characteristics of impinging air flow propagationand CO formation in lignite explosion[J]. Explosion And Shock Waves, 2019, 39(10): 105401. doi: 10.11883/bzycj-2018-0297

Citation:

LIU Tianqi. Numerical simulation on characteristics of impinging air flow propagationand CO formation in lignite explosion[J]. Explosion And Shock Waves, 2019, 39(10): 105401. doi: 10.11883/bzycj-2018-0297

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Numerical simulation on characteristics of impinging air flow propagationand CO formation in lignite explosion

doi: 10.11883/bzycj-2018-0297

LIU Tianqi

College of Safety Engineering, Shenyang Aerospace University, Shenyang 110136, Liaoning, China

Received Date: 2018-08-13
Rev Recd Date: 2018-11-02
Publish Date: 2019-10-01

Abstract

Abstract

In this paper we established a horizontal pipeline geometric model based on the horizontal pipeline coal dust explosion experimental device to study the characteristics of impinging airflow and CO gas generation during lignite explosion, and constructed the mathematical model of the coal-dust explosion dynamic propagation according to the 1∶1 ratio, with the characteristics of the airflow propagation and CO generation simulated. The results verified the reliability of the simulation by comparing the simulated and measured values of the lignite explosion flame propagation distance at different times. The spatial region is divided by the simulated velocity of the impinging airflow: z=0−0.10 m is the initial dusting zone, z=0.10−0.42 m is the impact airflow velocity jump zone, and z=0.42−0.98 m is the high velocity propagation zone of the impinging airflow. z=0.98−1.40 m is the impinging airflow buffer. The farther away from the centers of the z=0.20 m and z=0.40 m cross-sections, the greater the velocity of the impinging airflow, resulting from the " wall effect” of the fluid flow. The void ratio near the wall is larger than that in the inside of the fluid, and the resistance is weak when flowing. Therefore, the impinging airflow exhibits a relatively greater flow velocity near the wall. The simulation of the formation of CO gas products shows that z=0.30−0.60 m in the tube is the spatial range with the highest CO mass fraction, and the local maximum is 0.024%−0.026%. At z＞0.70 m, the particles were subjected to the gravity, and the high-temperature gas generated by the explosion was subjected to the buoyancy, resulting in a tendency of the CO gas product to sink.
- explosion of coal dust,
- impinging airflow,
- CO toxic gas product,
- lignite

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References(17)

References

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