Experimental investigation of the impact of liquid carbon dioxide injection on temperature in pulverized coal

2020 ◽  
Vol 10 (1) ◽  
pp. 147-159 ◽  
Author(s):  
Zhijin Yu ◽  
Song Yang ◽  
Hu Wen ◽  
Jun Deng
Keyword(s):  
Carbon Dioxide ◽  
Experimental Investigation ◽  
Pulverized Coal ◽  
Carbon Dioxide Injection ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
The Impact

scholarly journals Experimental Study on Explosion Pressure and Rock Breaking Characteristics under Liquid Carbon Dioxide Blasting

2018 ◽  
Vol 2018 ◽  
pp. 1-9 ◽  
Author(s):  
Yanan Zhang ◽  
Junren Deng ◽  
Bo Ke ◽  
Hongwei Deng ◽  
Jielin Li
Keyword(s):  
Carbon Dioxide ◽  
High Pressure ◽  
Free Field ◽  
Jet Impingement ◽  
Rock Breaking ◽  
Tensile Failure ◽  
Liquid Carbon ◽  
Liquid Carbon Dioxide ◽  
Explosion Pressure ◽  
The Impact

A liquid carbon dioxide blasting experiment was carried out under free field conditions, alongside a liquid carbon dioxide rock breaking experiment, to investigate explosion pressure variation and rock breaking characteristics under liquid carbon dioxide blasting. The experimental results show that the internal and external explosion pressures of the liquid carbon dioxide fracturing devices all rapidly increased at first, before attenuating vibrantly after blasting. When the explosion pressure was raised, the internal explosion pressure increased first exponentially and then linearly, while the external explosion pressure increased exponentially throughout. The duration time of the blasting effect stage was about 45 ms. Under the combined effect of jet impingement and a gas wedge of high-pressure carbon dioxide, the rock is subjected to tensile failure. The impact failure and the “gas wedge effect” of high-pressure carbon dioxide play a key role in the rock breaking of liquid carbon dioxide blasting technology.

scholarly journals Positive Phase Pressure Function and Pressure Attenuation Characteristic of a Liquid Carbon Dioxide Blasting System

Energies ◽  
2019 ◽  
Vol 12 (21) ◽  
pp. 4134
Author(s):  
Bo Ke ◽  
Keping Zhou ◽  
Gaofeng Ren ◽  
Ji Shi ◽  
Yanan Zhang
Keyword(s):  
Phase Transition ◽  
Carbon Dioxide ◽  
High Pressure ◽  
Impact Pressure ◽  
Positive Phase ◽  
Liquid Carbon ◽  
Edge Zone ◽  
Liquid Carbon Dioxide ◽  
The Impact ◽  
Phase Pressure

As environmental requirements become more stringent, the liquid carbon dioxide blasting system is one of the non-explosive blasting technologies that, with low tensile stress energy, will replace the chemical explosive blasting technology, and the impact pressure characteristic of high-pressure fluid is a crucial factor in the process of rock breaking. To further investigate the impact and pressure attenuation characteristics of high-pressure fluid during the phase transition of liquid carbon dioxide blasting system, the pressure curves of high-pressure fluid in liquid carbon dioxide blasting systems at different distances were measured in the laboratory. Based on the mechanism analysis of phase transition kinetics, the initial jet velocity of the four experiments was calculated, and the rationality of results was verified by the Bernoulli equation. The general expression of the positive phase pressure–time function was proposed, and the idealized impact pressure curve can be divided into five stages. The impact pressure field of the liquid carbon dioxide blasting system can be divided into three areas at different distances: the explosive jet impact zone, the jet edge zone and the shock wave action zone, and the pressure–contrast distance fitting equation of the liquid carbon dioxide blasting system were obtained.

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