Experimental device for observing cold shock cracking coal body in whole process

Abstract

The invention belongs to the technical field of cold impact cracking coal bodies, and particularly relates to an experimental device for observing cold impact cracking coal bodies in a whole process, which comprises a coal sample storage system, a liquid nitrogen injection system, a liquid nitrogen cold impact system, an ultrasonic acquisition and processing system and a thermal imaging acquisition and processing system, the coal sample storage system is composed of a constant temperature and humidity chamber and a coal body; the liquid nitrogen injection system is composed of a self-pressurization liquid nitrogen tank, a valve, a pressure gauge, a pressure regulating valve, an ultralow temperature flowmeter, an ultralow temperature thermal insulation pipe and a liquid nitrogen cold impact fracturing device; the liquid nitrogen cold impact system comprises a liquid nitrogen cold impact fracturing device, and the liquid nitrogen cold impact fracturing device comprises a device shell; the experimental device disclosed by the invention has the beneficial effects that the experimental device disclosed by the invention can realize that a coal sample is rapidly immersed in liquid nitrogen and is rapidly separated from the liquid nitrogen, the time of cold impact of the coal body by the liquid nitrogen in a cold impact experiment is effectively controlled, and the accuracy of variable cold impact time is ensured.

Description

technical field [0001] The invention belongs to the technical field of cold shock fracturing coal bodies, and in particular relates to an experimental device for observing the whole process of cold shock fracturing coal bodies. Background technique [0002] my country's primary energy consumption structure is dominated by coal. With the steady development of my country's economy, the demand for coal has also increased. Coal has become an important resource base for my country's industrial and economic development. At present, most of the coal mines in my country are produced by underground mining, and with the passage of shallow coal mining time and the demand for energy, the hidden resources are increasingly exhausted, leading to the gradual entry of my country's mine mining into the deep mining stage. As the mine enters deep mining, the gas content and gas emission in the coal seam increase sharply. Especially under special conditions such as high ground stress and high gr...

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Problems solved by technology

[0004] With the development of science and technology, in order to solve the problem of technical deficiencies in coal seam enhancement in the past, to carry out efficient pre-extraction and utilization of coal seam gas, prevent gas accidents and reduce environmental pollution, and maximize economic benefits, ultra-low temperature fluids such as liquid nitrogen are used as The anhydrous fracturing technology of fracturing fluid has gradually been paid attention to, but the laboratory lacks observation instruments for the energy and structural changes of the coal body in the whole process of liquid nitrogen cold impact coal body, and the theory of liquid nitrogen on the coal body in the laboratory still needs to be further developed. Discussion in order to provide guidance for coal seam permeability enhancement

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