A test device and method for cooling air flow of frozen wall of mine

Abstract

The invention discloses a device and a method for testing cooling air flow of a mine freezing wall. The actual freezing construction mine shaft air supply working condition can be simulated; a real mine freezing wall is selected and restored according to a certain compression ratio and soil layer parameters; a test device composed of a mine shaft simulation system, a low-temperature refrigerationand freezing system, a freezing wall reverse heat removal system and a test system are utilized to realize the following four main test functions and research values: a freezing wall transmits coolingair flow characteristic test through heat-humidity coupling of a shaft wall and air flow; freezing wall reverse cooling characteristic testing and low-temperature salt liquid air cooler and air flowheat and humidity exchange characteristic testing are carried out; under the air supply working condition and the reverse cooling strip taking working condition, the thawing characteristic of the freezing wall is achieved; the air flow heat and humidity exchange characteristic in the vertical or horizontal circular pipe is tested, so that the rule of recycling the cooling air flow of the mine freezing wall is researched and analyzed, and a solid theoretical basis is provided for improving the underground heat and humidity environment by directly cooling the air flow of the mine freezing wall.

Description

technical field [0001] The invention relates to the field of mine equipment, more specifically, to a test device and method for cooling air flow of frozen walls of mines. Background technique [0002] When the coal mine vertical shaft shaft is constructed in an unstable topsoil layer or isolating groundwater, special construction methods are generally adopted to pass smoothly. At present, the freezing method is widely used. The freezing method has a long history and is relatively mature in theory and practice. When the freezing method is used for construction, the excavation of the shaft of the coal mine shaft must be excavated at an appropriate time. When the frozen wall has formed but has not been frozen within the range of the shaft, the stability of the frozen wall is better, which is the best choice for the excavation time of the shaft. Otherwise, it may be unfavorable to the excavation of the wellbore or cause water gushing and sanding accidents. [0003] With the de...

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Problems solved by technology

[0003] With the development of the economy, the increase of energy demand and the development of coal resources to the deep, in the deep mines in the northwestern and eastern regions of my country, after the freezing method is used to construct the well, a frozen wall with a thickness of about 10m is formed in the radial direction of the wellbore, and the depth reaches Hundreds of meters, after the construction is completed, the cooling capacity of the frozen wall is mostly melted naturally, but not well utilized

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