An experimental method and system device for microflow in coal mine goaf

Abstract

Disclosed is a mined-out coal area micro-flow experiment method. The mined-out coal area micro-flow experiment method is characterized in that the affection of differential pressure driving effect on a flow field inside a mining area is captured by means of supplying air dynamically and premixing tracer gas; the affection of gas concentration diffusion effect on gas concentration migration inside the mined-out area is captured by means of releasing the tracer gas inside the mined-out area. The experiment device comprises a mining-area dynamic ventilation sub-device, a tracer gas releasing sub-device, a tracer gas concentration measurement sub-device and a mined-out area model sub-device. The simulation of the micro-flow process of the differential pressure driven-concentration diffusion coupled mined-out area can be realized through detection of tracer gas concentration inside the mined-out area and on a working surface and acquisition of continuous real-time concentration volume of the tracer gas, effect rules and function mechanism of gas emission or protrusion of the mined-out area on ventilation of the mining area can be quantitatively researched, disturbance characteristics of dynamic ventilation of the mining area on flow of the flow field inside the mined-out area can be studied, and the effect rules of various ventilation modes on the ventilation of the mining area and the micro flow inside the mined-out area can be researched.

Description

technical field [0001] The invention belongs to the field of internal flow research in coal mine goaf, and specifically relates to an experimental method for measuring the concentration field of microflow in the goaf, including a goaf model device, a dynamic ventilation device in the mining area, a tracer gas release device, and a tracer gas concentration measurement device. technical background [0002] The goaf is the goaf left after coal mining, and the microflow in the goaf refers to the flow phenomenon of fluid in the small flow channel. Micro-flow in goaf is a special form of fluid flow. There are fine-scale flow, large-scale flow, and their mixed flow. As a result, the existing linear Darcy seepage equation and Navier-Stokes fluid control equations cannot be effective. Describe its flow phenomenon. However, the flow conditions inside the goaf directly affect the ventilation safety of the mining area in underground coal mining. The goaf is a major hidden danger area...

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Problems solved by technology

However, these experimental methods and devices are difficult to achieve continuous and real-time acquisition of the gas concentration in the goaf. Differential driving effect and its diffusion effect of internal gas concentration gradient

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