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Air supply system for achieving natural energy dehumidification by using underground tunnel wall surface

An air supply system and underground tunnel technology, which is applied in the ventilation of mines/tunnels, mining equipment, and earth-moving drilling, etc., can solve the problems of fogging of workshops, obstacles of underground traffic tunnels, affecting the health and work efficiency of workers, etc. To achieve the effect of reducing load and reducing air moisture content

Inactive Publication Date: 2018-11-23
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

The impact of fogging and condensation in the underground corridor has two sides: on the one hand, when the rock mass is pre-cooling the air and condensation occurs, it is a process of dehumidification and cooling for the air, which increases the latent heat of the air The exchange is beneficial to enhance the heat exchange effect between the underground corridor and the air, and is beneficial to reduce the moisture content of the air introduced into the factory building; on the other hand, the relative humidity of the air increases while the heat exchange cools down. The air will condense when the temperature is high, and even fog will appear in the underground corridor, which will reduce the visibility in the cave and bring obstacles to the underground traffic tunnel. At the same time, it will also bring high humidity air into the factory, causing fogging and condensation inside the factory Exposure not only affects the operation of electrical equipment, but also affects the health and work efficiency of the staff, which must be avoided

Method used

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  • Air supply system for achieving natural energy dehumidification by using underground tunnel wall surface
  • Air supply system for achieving natural energy dehumidification by using underground tunnel wall surface
  • Air supply system for achieving natural energy dehumidification by using underground tunnel wall surface

Examples

Experimental program
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Effect test

Embodiment 1

[0030] According to the actual situation, the size of the underground tunnel is 1000000(x)×8000(y)×8000(z)(mm 3 ) numerical calculation model, the partition plate is arranged on both sides 500mm away from the side wall, and arranged along the x-axis from the entrance to the end of the tunnel. For summer working conditions, the temperature of all walls inside the underground tunnel is 295K, and the wall surface roughness is 0.1; the temperature of the air supply air at the entrance of the tunnel is 305K, the relative humidity is 70%, and the air supply speed is 8m / s; the material of the partition plate is stainless steel plate And set the heat insulation layer, the heat flux is 0W / m 2 .

[0031] In order to verify the heat exchange effect between the air in the air supply duct and the cave wall in this embodiment, the average turbulence energy model, namely the standard k-ε model, is used to solve the equations.

[0032] image 3 It is the air temperature and relative humidi...

Embodiment 2

[0036] Establish the same numerical calculation model as in Example 1, changing the wall roughness to 0.2. The enthalpy value of the air from the inlet to the end of the air duct is reduced by 22.62kJ / kg, and the moisture content is reduced by 4.72g / kg. Compared with Example 1, the changes of enthalpy and moisture content of the inlet and end air are the same, but the heat exchange efficiency is different. For the comparison results, see Figure 5 .

Embodiment 3

[0038] Establish the same numerical calculation model as in Example 1, changing the wall roughness to 0.3. The enthalpy value of the air from the inlet to the end of the air duct is reduced by 22.62kJ / kg, and the moisture content is reduced by 4.72g / kg. Compared with Example 1, the changes of enthalpy and moisture content of the inlet and end air are the same, but the heat exchange efficiency is different. For the comparison results, see Image 6 .

[0039]The environmental control goal of underground tunnels in summer is to use natural energy to achieve cooling and dehumidification to save high-grade energy. Embodiment 1, Embodiment 2 and Embodiment 3 are respectively the air inlet effect simulation under different roughness working conditions of the wall surface of the air inlet tunnel, and it can be found from the analysis of the results that using the air inlet tunnel of the present invention to supply air compared with the traditional tunnel The cooling and dehumidifica...

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Abstract

The invention discloses an air supply system for achieving natural energy dehumidification by using an underground tunnel wall surface. The air supply system is provided with partition plates, fresh air is sent into air supply holes through an air supply device, the heat and humidity treatment capacity of underground tunnel rock to the entering air can be fully utilized, the moisture content of the air entering an engineering plant is reduced, the load of an air conditioning system in the plant is reduced, and the purpose of saving the energy is achieved; meanwhile, the problems can be solvedthat due to the occurrence of the phenomena of moisture condensation and fogging in an underground tunnel, the traffic safety is influenced.

Description

technical field [0001] The invention relates to an air supply system, in particular to an air supply system which utilizes the wall surface of an underground tunnel to realize natural energy dehumidification. Background technique [0002] Underground engineering workshops generally introduce fresh air from outside through wind tunnels, underground corridors or other underground passages. Due to the great thermal inertia and thermal inertia of the soil, the temperature fluctuation of the soil surface affected by the external climate gradually decreases with the increase of the soil depth and there is a hysteresis. At a certain depth of the soil, the temperature is in a constant temperature state. When the air flows through the underground passage, it will exchange heat and moisture with the cave wall rock mass. The temperature of the rock mass at a certain depth is lower than the outside air temperature in summer and higher than the outside ambient temperature in winter. The ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21F1/00E21F1/08E21F3/00
CPCE21F1/00E21F1/08E21F3/00
Inventor 李安桂任彤惠浩勃林文峰林文华胡海虹
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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