CN-121993863-A - System and method for heating ventilation pipeline in construction period of alpine tunnel by utilizing geothermal energy

CN121993863ACN 121993863 ACN121993863 ACN 121993863ACN-121993863-A

Abstract

The invention provides a ventilation pipeline heating system and a ventilation pipeline heating method in a construction period of a alpine tunnel by utilizing geothermal energy, belonging to the technical field of tunnel engineering; the heating system and the heating method can fully utilize the geothermal energy in the construction period of the tunnel in the cold region to heat the fresh air fed into the tunnel, realize the air temperature regulation control in the construction period with low energy consumption, long period and greenness, thereby effectively improving the working environment of the face and improving the construction safety and environmental comfort.

Inventors

CAO SHANPENG
ZHOU SHUMEI
HE LONGPENG
ZHANG JIAXUAN

Assignees

中国建筑第八工程局有限公司

Dates

Publication Date: 20260508
Application Date: 20260316

Claims (10)

1. The utility model provides an utilize high and cold tunnel construction period ventilation line heating system of geothermal energy which characterized in that includes: A ventilation pipeline which is arranged in the tunnel and is used for conveying air into the tunnel; the energy anchor rod is arranged in surrounding rock at the inlet end of the tunnel and is used for collecting ground temperature energy; an air heating module, which is arranged at the air inlet section of the ventilation pipeline and is used for heating the air flowing through the air heating module; the heat transmission pipeline is internally filled with a heat exchange medium, and the energy anchor rod and the air heating module are connected in series to form a closed circulation loop; A circulation pump group arranged on the heat transmission pipeline and used for driving the heat exchange medium to flow in the circulation loop; The circulating pump set drives the heat exchange medium to flow through the energy anchor rod to absorb geothermal energy, and flow through the air heating module to release heat, so that air conveyed to the face through the air heating module is heated.
2. The ventilating pipeline heating system for the construction period of the alpine tunnel by utilizing the geothermal energy according to claim 1, wherein the energy anchor rod comprises an anchor rod body, a heat exchange pipeline is arranged in the anchor rod body, and two ends of the heat exchange pipeline are respectively connected with the circulating pump group and the air heating module as interfaces; the anchor rod body is arranged in the surrounding rock drilling hole, and grouting materials with high heat conductivity are backfilled between the anchor rod body and the drilling hole to form an anchoring grouting layer.
3. The system for heating a ventilating duct in a construction period of a high and cold tunnel by utilizing geothermal energy according to claim 1, wherein the air heating module comprises a housing arranged at an air inlet section of the ventilating duct, a fin tube array arranged in a ventilating direction inside the housing, and a heating module inlet and a heating module outlet are arranged on the fin tube array; The heating module inlet is connected with the energy anchor rod, and the heating module outlet is connected with the circulating pump group.
4. The system for heating ventilation pipes in construction period of alpine tunnel by using geothermal energy as set forth in claim 3, wherein the housing is provided with an inlet port and an outlet port, and an electric heating grid is disposed between the fin tube array and the outlet port.
5. The system for heating a ventilation line during construction of a high and cold tunnel using geothermal energy of claim 1, further comprising a temperature control assembly; The temperature control assembly comprises a temperature sensor arranged at an air outlet of the air heating module or in the face area, and a circulating pump controller for adjusting the power of the circulating pump set according to a feedback signal of the temperature sensor.
6. The heating system for the ventilating pipeline of the construction period of the alpine tunnel using the geothermal energy as set forth in claim 1, further comprising an intelligent control device; the intelligent control device comprises: The regional monitoring unit comprises a plurality of surrounding rock temperature sensor groups respectively corresponding to different energy anchor rod groups and grouping control valves arranged on branches of all grouping heat transmission pipelines; the input end of the central control unit is connected with each surrounding rock temperature sensor group, the output end of the central control unit is connected with each grouping control valve and the circulating pump group, and a surrounding rock temperature safety threshold value is preset; the central control unit is used for comparing the surrounding rock temperature of each group with the safety threshold in real time and independently controlling the opening and closing of each group control valve, so that when the surrounding rock temperature of a certain group is lower than or equal to the safety threshold, the corresponding valve is closed to stop heat taking.
7. The method for heating the ventilation pipeline in the construction period of the alpine tunnel by utilizing the geothermal energy is characterized by comprising the following steps of: The heat-taking stage comprises the steps of distributing energy anchor rods in groups at the entrance section of a tunnel in a cold region, driving a heat exchange medium to flow through the energy anchor rods by using a circulating pump set, and absorbing the geothermal energy in surrounding rock; The heat transfer stage comprises the steps that circulating heat exchange medium is conveyed to an air heating module through a heat transmission pipeline; The heat exchange stage is that a heat exchange medium exchanges heat with ventilation air in an air heating module to heat the air to a set temperature range; the ventilation pipeline conveys the heated air to the face, and the temperature of the working area is increased to improve the working environment of workers; And in the cycle backheating stage, the heat exchange medium after heat exchange flows back to the energy anchor rod, and the closed cycle is maintained through the cycle pump group, so that continuous heat supply is realized.
8. The method for heating ventilation lines in construction period of alpine tunnel by using geothermal energy according to claim 7, wherein the heating stage further comprises closed-loop control of surrounding rock temperature, the closed-loop control of surrounding rock temperature comprises the following steps: Setting and monitoring, namely setting a surrounding rock temperature safety threshold value for each energy anchor rod group, and monitoring the surrounding rock temperature of each group corresponding area in real time; comparing the real-time surrounding rock temperature of each group with the safety threshold value, and independently controlling the opening and closing states of control valves on the heat transmission pipelines of the groups according to the comparison result; When the real-time surrounding rock temperature of a certain group is lower than or equal to the safety threshold value, closing a control valve corresponding to the group, and stopping collecting heat from the group; And dynamically adjusting the total load of the heating system according to the grouping number and the heating capacity in the current working state.
9. The method for heating a ventilation line in a construction period of a high and cold tunnel using geothermal energy according to claim 7, further comprising a recovery monitor, wherein the recovery monitor comprises: Continuously monitoring the surrounding rock temperature of the group in the heat recovery state, and restarting the control valve of the group when the temperature of the surrounding rock is higher than the recovery restarting threshold value so as to resume the participation in heat collection; wherein the recovery restart threshold is higher than the surrounding rock temperature safety threshold.
10. The method for heating ventilation lines in construction period of alpine tunnel using geothermal energy according to claim 7, further comprising a group rotation management, wherein the group rotation management comprises: The central control unit records the historical accumulated working time or heat taking amount of each energy anchor rod group; When the total load of the heating system is required to be adjusted or the energy anchor rod grouping is required to be restarted, the energy anchor rod grouping with shorter historical accumulated working time or smaller heat extraction amount is preferentially started, so that the balanced distribution of the working load among all the energy anchor rod groupings is realized.

Description

System and method for heating ventilation pipeline in construction period of alpine tunnel by utilizing geothermal energy Technical Field The invention belongs to the technical field of tunnel engineering, and particularly relates to a ventilating pipeline heating system and method for a construction period of a high and cold tunnel by utilizing ground temperature energy. Background In cold areas, tunnel construction period ventilation systems face serious challenges. In the tunnel construction process, enough fresh air is required to be continuously conveyed to the tunnel face so as to dilute blast smoke, tail gas and dust particles of diesel equipment generated after blasting, and ensure the safety of the operation environment and the health of personnel. At present, a high-pressure air blower is generally adopted in engineering to convey air pressure outside a tunnel to a tunnel face so as to maintain air exchange and ventilation in a construction area. However, in the construction of a high and cold tunnel, the outside air temperature is usually between-5 ℃ and-30 ℃, cold air outside the tunnel is directly fed into the tunnel, the air flow temperature is low when entering the tunnel face, and the air flow temperature directly acts on operators to generate obvious wind-cold effect, so that the body temperature is rapidly reduced, and the construction safety and the labor efficiency are affected. In addition, the air pipe and the connecting piece are in an embrittled state by long-time low-temperature air conveying, and are easy to break in installation or blasting vibration, so that the air leakage rate of the system is increased, the actual air supply amount is reduced, and the ventilation efficiency is reduced. Meanwhile, the maintenance effect of sprayed concrete and lining structures is poor due to the fact that the temperature in the tunnel is reduced, even freezing injury is induced, and engineering quality and construction progress are threatened. For this reason, combustion type air heaters or electric heating devices are often used in the prior art to heat the air supply. The combustion type air heater has the advantages of high fuel consumption, high operation cost and safety risk although the temperature is raised quickly, and the electric heating device has a simple structure, high power requirement, low electric energy conversion efficiency and poor economy, and the temporary power supply capability of construction is often not met. Both schemes have the problems of high energy consumption, high operation cost, inapplicability to long-period operation and the like, and do not meet the construction requirements of energy conservation, safety and redundancy of the alpine tunnel. Therefore, there is a need to design a new ventilating pipeline heating system for the construction period of the alpine tunnel to solve the technical problems faced at present. Disclosure of Invention Aiming at the defects existing in the prior art, the invention provides a ventilating pipeline heating system and a ventilating pipeline heating method for the construction period of a high-cold tunnel by utilizing the ground temperature energy, which can fully utilize the ground temperature energy in the construction period of the tunnel in the cold region to heat fresh air fed into the tunnel, and realize low-energy consumption, long-period and green construction period air temperature regulation control, thereby effectively improving the working environment of the tunnel face and improving the construction safety and environmental comfort. The technical scheme of the invention is that the ventilation pipeline heating system for the construction period of the alpine tunnel by utilizing the geothermal energy comprises: A ventilation pipeline which is arranged in the tunnel and is used for conveying air into the tunnel; the energy anchor rod is arranged in surrounding rock at the inlet end of the tunnel and is used for collecting ground temperature energy; an air heating module, which is arranged at the air inlet section of the ventilation pipeline and is used for heating the air flowing through the air heating module; the heat transmission pipeline is internally filled with a heat exchange medium, and the energy anchor rod and the air heating module are connected in series to form a closed circulation loop; A circulation pump group arranged on the heat transmission pipeline and used for driving the heat exchange medium to flow in the circulation loop; The circulating pump set drives the heat exchange medium to flow through the energy anchor rod to absorb geothermal energy, and flow through the air heating module to release heat, so that air conveyed to the face through the air heating module is heated. Further, the energy anchor rod comprises an anchor rod body, a heat exchange pipeline is arranged in the anchor rod body, and two ends of the heat exchange pipeline are used as interfaces to be respectively connected with