CN115234281A - A tunnel ventilation and refrigeration system - Google Patents

Abstract

The invention discloses a tunnel ventilation and refrigeration system which comprises an expansion machine connected with an air compressor, wherein the expansion machine is communicated with a secondary air pipe in a tunnel through an air mixer, and an air distribution pipeline connected with the expansion machine in parallel is arranged between the air compressor and the air mixer. According to the technical scheme, high-pressure air is generated by an air compressor, the high-pressure air is transported and shunted through a pipeline, part of the high-pressure air enters an expander for expansion refrigeration, refrigerated cold air is mixed with compressed air which is not subjected to expansion refrigeration in a mixer and is decompressed, and fresh air with conventional ventilation pressure and corresponding refrigeration temperature is finally formed, and the fresh air is conveyed to a working area at the rear part of a shield body through a secondary air pipe for air supply, so that the working environment is improved, people can breathe, and the industrial requirements of tunnel ventilation and the working environment are met.

Description

A tunnel ventilation and refrigeration system

technical field

The invention relates to the technical field of tunnel ventilation and refrigeration, in particular to a tunnel ventilation and refrigeration system.

Background technique

At present, the refrigeration system used in the shield tunnel construction tunnel uses external water to cool the chilled water of the refrigeration unit, and the low-temperature chilled water cools the fresh air in the fresh air duct through the air cooler to achieve the cooling effect. 40m ³ /h, large-diameter tunnels require more water for cooling, which is larger than the cooling cycle and water consumption of the tunnel construction equipment itself; it is urgent to find a cooling solution with less water demand, especially for areas with insufficient water supply.

Therefore, a refrigeration system using air cooling for cooling has appeared in the prior art. For example, the Chinese invention patent application whose application publication date is 2022.04.29 and whose application publication number is CN 114412535 A discloses an ultra-long continuous operation based on tunnel TBM. In the method of continuous high-pressure air supply over a distance, the air compressor is used to compress the air, the high-pressure air is used for long-distance continuous air supply, and the expander is used to reduce the temperature. However, this technical solution has the following problems:

(1) Necessary treatment for high-pressure ventilation is not performed before entering the tunnel. According to the expansion and cooling efficiency characteristics of the expander, all the compressed air required for ventilation enters the expander for expansion and cooling, which will result in an excessively low outlet temperature (about -18°C). , the moisture in the compressed air will freeze, and after the compressed air expands and accelerates, it will destroy the structure of the expander and damage the equipment;

(2) After communicating with well-known domestic expander manufacturers, the gas expander with the largest suction capacity in China currently has a suction capacity of 3-5Nm ³ . Due to the limitation of the expander's own suction capacity, there is currently no capacity equal to the shield. Therefore, even if the factor that the moisture in the compressed air freezes and destroys the expander is not considered, it is impossible to make all the required ventilation volume enter the expander for expansion refrigeration;

(3) All the high-pressure air will pass through the expansion machine, causing the outlet air temperature to be too low to be adjusted, and the suitable ventilation temperature of the tunnel is 20-26 °C, and the too low ventilation temperature cannot meet the normal use requirements;

(4) In order to ensure continuous air supply, the technical solution of the above patent application adopts two sets of expanders and two sets of air duct extension structures, which causes great difficulty in construction and operation cost and space layout, and is not easy to achieve.

Therefore, it is necessary to design a more convenient and effective new high-pressure ventilation expander refrigeration system.

SUMMARY OF THE INVENTION

In view of the above-mentioned deficiencies in the background technology, the present invention proposes a tunnel ventilation and refrigeration system, which solves the technical problems that the expander of the existing tunnel construction refrigeration system is easily damaged and the outlet air temperature is too low.

The technical solution of this application is:

A tunnel ventilation and refrigeration system includes an expander connected to an air compressor, the expander is communicated with a secondary air pipe in the tunnel through an air mixer, and an air mixer is arranged between the air compressor and the air mixer. The gas distribution line in parallel with the expander. The technical scheme uses an air compressor to generate high-pressure air, which is transported and divided through pipelines, and part of the high-pressure air enters the expander for expansion and refrigeration. The fresh air with conventional ventilation pressure and corresponding cooling temperature is transported to the working area at the rear of the shield body through the secondary air duct for air supply, which improves the working environment and allows personnel to breathe, and meets the requirements of tunnel ventilation and working environment industry.

Further, a decompression valve is provided on the air distribution pipeline, and the compressed air without expansion refrigeration is decompressed by the decompression valve, which can be fully mixed with the refrigerated cold air in the air mixer, and then a more uniform conventional ventilation can be obtained. Fresh air with pressure and corresponding cooling temperature.

Further, the air mixer includes a mixer body connected with the expander and the pressure reducing valve, and a check valve is provided between the mixer body, the expander and the pressure reducing valve, and the check valve can effectively prevent the gas backflow.

Further, the mixer body is connected with a pressure gauge or/and a pressure sensor, which can detect the pressure of the mixer.

Further, the air compressor is a variable frequency air compressor, and the pressure sensor connected to the air mixer forms an automatically adjusted closed-loop system with the air compressor through the control system. Tunneling distance and resistance loss of high-pressure air duct automatically adjust the initial pressure.

Further, the exhaust end of the air mixer is spaced and matched with the air inlet of the secondary air duct through a horn-shaped end. Through the horn-shaped end, the fresh air can better pass into the secondary air duct, and at the same time, it is not directly connected with the secondary air duct, which can prevent the air volume of the primary ventilation and the secondary ventilation from being unequal, which may lead to bulging or suction of this part of the air duct. collapse, or avoid the collapse of the air duct caused by the extremely negative pressure suction and collapse of the air duct when the high-pressure ventilation outside the cave is abnormally closed.

Further, a bypass valve for detection is provided between the trumpet-shaped end and the air mixer. Through the bypass valve, it can detect whether the temperature and pressure of the outlet air of the mixer are suitable, so as to adjust the system according to the detected value, adjust the parameters such as the outlet gas pressure of the air compressor, the inlet pressure of the expander, and the gas volume, and then adjust the exhaust gas of the mixer. pressure and temperature.

Further, two high-pressure flexible air ducts are connected in parallel with the air inlet end of the pressure reducing valve and the expander, and the two high-pressure flexible air ducts are respectively arranged on two air duct reels or two air duct storage reels. The air compressor is connected to one of the high-pressure flexible ducts through a high-pressure duct. The air duct reel or two air duct storage reels store a certain length of high-pressure flexible air duct, and the high-pressure air duct is extended as the roadheader continues to excavate. When the high-pressure flexible air duct on the air duct storage drum extends to the limit, the corresponding valve can be closed, and the high-pressure air duct connected with the high-pressure flexible air duct can be quickly disassembled and assembled to the spare air duct reel or the high-pressure flexible air duct of the air duct storage drum. , continue to extend the air duct with the roadheader. If the high-pressure air duct in the tunnel adopts a hard pipe for high-pressure air and adopts the corresponding high-pressure air duct on-off valve, the high-pressure air duct on-off valve should be quickly closed in time during the maintenance time of the roadheader, that is, when it is not tunneling, and then disconnect the high-pressure air duct. The connection between the air duct and the high-pressure flexible air duct in the air duct reel or the air duct storage cylinder, the air duct reel or the air duct storage cylinder is rolled back by the attached motor, and at the same time, the corresponding high-pressure flexible air duct area is laid in the corresponding tunnel. Then connect the high-pressure air duct to another air duct reel or the high-pressure flexible air duct in the air duct storage drum, and continue high-pressure ventilation to ensure the normal ventilation and tunneling of the roadheader.

Further, the secondary air duct is provided with a secondary fan near the port of the air mixer. The secondary fan acts as a relay, which can relay the primary air discharged from the air mixer through the horn-shaped end and transport it to the working area deep in the tunnel through the secondary air pipe, thereby realizing the tunnel ventilation and refrigeration system under continuous tunnel excavation. The function of ventilation and cooling.

Further, several fifth on-off valves are arranged on the high-pressure air duct at intervals, that is, fifth on-off valves are arranged on both sides of the high-pressure air duct at a certain distance, and the fifth on-off valves on both sides can be closed in time when the high-pressure air duct is worn and leaked. Carry out maintenance and replacement; the end of the high-pressure flexible air duct connected with the high-pressure air duct is provided with a sixth switch valve, which is convenient for the high-pressure air duct to be removed from one high-pressure flexible air duct when changing steps, and the other high-pressure air duct The flexible air pipe connection can also prevent the backflow of gas in the high-pressure flexible air pipe.

Further, an air storage tank is arranged between the air compressor, the expander and the gas distribution pipeline, and the air storage tank is connected with a safety valve, a second switch valve and an automatic drain valve. The air storage tank is used to store compressed air and stabilize the compressed air; the safety valve ensures the safety of the air storage tank and prevents the pressure of the air storage tank from suddenly increasing; the second switch valve controls the drainage pipeline of the air storage tank The automatic drain valve is used for automatic drainage, the second on-off valve is opened during normal operation, the gas storage tank is automatically drained through the automatic drain valve, and the automatic drain valve can be overhauled when the second on-off valve is closed.

Further, a pretreatment assembly is provided on the pipeline between the air storage tank and the expander, and the pretreatment assembly includes a filter or/and a water eliminator, and the air inlet end of the pretreatment assembly is provided with a third The on-off valve and the gas outlet are provided with a fourth on-off valve. The filter performs multi-stage filtration on the compressed air, so that the air source entering the expander is clean, and the workers in the tunnel can breathe safely; Damage to the expander when the temperature is below zero.

Further, two groups of the pretreatment assemblies are arranged in parallel, and each group of pretreatment assemblies is provided with a third switch valve at the air inlet end and a fourth switch valve at the air outlet end. The third on-off valve and the fourth on-off valve can be closed at the same time to repair the filter or/and the water eliminator in the middle. When one group of pretreatment components needs maintenance, one group of pretreatment components can be closed, and the other group of pretreatment components can be closed. can continue to work.

Further, the air compressor and the air storage tank are both arranged outside the tunnel, and a first switch valve is arranged between the air compressor and the air storage tank. The first switch valve controls the on-off of the compressed air pipeline, which is convenient. Repair the corresponding air compressor.

Further, the expander is connected with a generator, and the useful work output by the expander can be used to generate electricity.

Compared with the prior art, the invention can not only perform ventilation and refrigeration to reduce the ambient temperature of the working area and improve the construction environment, but also can adjust the outlet air temperature of the expander through the air mixer. The invention adjusts the air intake through the air inlet of the expander, so that a certain amount of compressed air enters the expander to perform adiabatic multi-stage expansion to do work, and the work can be used for power generation or other uses; at the same time, the expander decompresses and cools the compressed air, The refrigerated low-temperature gas is fully mixed and decompressed with the original compressed air that has not been refrigerated by the expander to obtain fresh ventilation with appropriate pressure and temperature, which is transferred by the secondary fan to improve the working environment and allow personnel to breathe, and to meet the needs of tunnel ventilation and work. Environmental industry requirements. Furthermore, the variable frequency air compressor is used to realize the adjustable supply pressure of high-pressure ventilation in the tunnel, and the initial pressure is adjusted according to the tunnel excavation distance and the resistance loss of the high-pressure air duct. Remove water to meet the air intake requirements of the expander. Further, through the reasonable conversion of the air duct reel or the reasonable conversion of the air duct storage cylinder, the continuous ventilation of the tunnel boring machine is ensured during the excavation process, thereby ensuring the continuous uninterrupted excavation of the tunnel boring machine.

The invention adopts the reasonable combination of high-pressure ventilation and expander refrigeration technology to cool the ventilation system of the roadheader. Ambient temperature, improve the construction environment.

Description of drawings

In order to illustrate the embodiments of the present invention more clearly, the following briefly introduces the accompanying drawings used in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, which are common in the art. As far as technical personnel are concerned, other drawings can also be obtained based on these drawings without any creative effort.

Fig. 1 is the principle schematic diagram of the present invention;

Labels in the figure:

1-air compressor, 2-first on-off valve, 3-air storage tank;

4-safety valve, 4.1-second switch valve, 4.2-automatic drain valve;

5-the third switch valve, 6-filter, 7-water eliminator, 8-the fourth switch valve;

9- fifth switch valve, 9.1- high pressure air duct, 10- sixth switch valve, 11- air duct reel;

12-expander, 13-generator;

14-air mixer, 14.1-check valve, 14.2-mixer body, 14.3-pressure gauge, 14.4-bypass valve;

15-trumpet end, 16-secondary air duct, 17-secondary fan.

Detailed ways

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

A tunnel ventilation and refrigeration system, as shown in Figure 1, includes an expander 12 connected to an air compressor 1, the air compressor 1 is located at an air compressor station outside the tunnel, providing a high-pressure air source for the entire high-pressure ventilation system, The air compressor 1 is preferably an oil-free air compressor to ensure that the compressed air can be breathed by people after decompression; the air compressor 1 is preferably controlled by frequency conversion, and the outlet pressure can be continuously controlled and adjusted according to the demand, that is, according to the wind pressure of the high-pressure ventilation pipe of the tunnel. The loss adjusts the initial pressure to ensure the inlet gas pressure of the expander.

The expander 12 communicates with the secondary air pipe 16 in the tunnel through an air mixer 14 , and an air distribution pipeline connected in parallel with the expander 12 is provided between the air compressor 1 and the air mixer 14 . The air compressor 1 is used to generate high-pressure air, and the high-pressure air is transported and divided through pipelines, and part of the high-pressure air enters the expander 12 for expansion and refrigeration. The fresh air with conventional ventilation pressure and corresponding refrigeration temperature, the fresh air is transported to the rear working area through the secondary air duct 16 for air supply, improving the working environment and allowing personnel to breathe, and meeting the industry requirements for tunnel ventilation and working environment.

On the basis of the above embodiment, as a preferred embodiment, a pressure reducing valve 12.1 is provided on the gas distribution pipeline, and the compressed air without expansion refrigeration is decompressed by the pressure reducing valve, and can be mixed with the air mixer 14 in the air mixer 14. The refrigerated cold air is fully mixed, and then a more uniform conventional ventilation pressure and fresh air of the corresponding cooling temperature are obtained.

On the basis of the above embodiment, as a preferred embodiment, the air mixer 14 includes a mixer body 14.2 connected with the expander 12 and the pressure reducing valve 12.1, and the mixer body 14.2 is connected with the expander 12 and the pressure reducing valve 12.1. One-way valves 14.1 are arranged between the pressure reducing valves 12.1, and the one-way valves 14.1 prevent the backflow of gas.

On the basis of the above embodiment, as a preferred embodiment, the mixer body 14.2 is connected with a pressure gauge 14.3 or/and a pressure sensor, which can detect the mixer pressure. When the air compressor 1 adopts a variable frequency air compressor, the pressure sensor can form an automatic closed-loop system with the air compressor 1 through the control system, and the air compressor 1 can be automatically adjusted according to the cooling demand. Adjust the initial pressure to meet the air inlet requirements and mixed air outlet requirements of the expander.

On the basis of the above-mentioned embodiment, as a preferred embodiment, the exhaust end of the air mixer 14 is spaced to fit with the air inlet of the secondary air duct 16 through the horn-shaped end head 15 . Through the horn-shaped end 15, the fresh air can better pass into the secondary air duct 16, and at the same time, it is not directly connected with the secondary air duct 16, which can prevent the air volume of the primary ventilation and the secondary ventilation from being unequal and causing this part of the air duct. Bulge or collapse, or avoid the collapse of the air duct caused by the extreme negative pressure suction and collapse of the air duct when the high-pressure ventilation outside the cave is abnormally closed.

On the basis of the above embodiment, as a preferred embodiment, a bypass valve 14.4 for detection is provided between the trumpet-shaped end 15 and the air mixer 14 . The bypass valve 14.4 can detect whether the outlet air temperature and pressure of the mixer 14 are suitable, so as to adjust the system according to the detected values, adjust the parameters such as the outlet gas pressure of the air compressor 1, the inlet pressure of the expander 12, the gas volume, etc., and then adjust the mixing 14 discharge pressure and temperature.

On the basis of the above embodiment, as a preferred embodiment, the pressure reducing valve 12.1 and the inlet end of the expander 12 are connected in parallel with two high-pressure flexible air pipes, and the two high-pressure flexible air pipes are respectively arranged in two On the air duct reel 11 or two air duct storage drums, the air compressor 1 is connected to one of the high-pressure flexible air ducts through a high-pressure air duct 9.1. The air duct reel 11 or two air duct storage cylinders store a certain length of high-pressure flexible air duct, and the high-pressure air duct is extended with the continuous excavation of the roadheader. Or when the high-pressure flexible air duct on the air duct storage cylinder extends to the limit, the corresponding valve can be closed, and the high-pressure air duct connected with the high-pressure flexible air duct can be quickly disassembled and assembled to the spare air duct reel or the high-pressure flexible air of the air duct storage cylinder. On the pipe, continue to extend the air pipe with the roadheader. If the high-pressure air duct 9.1 in the tunnel adopts a hard pipe for high-pressure air and adopts the corresponding high-pressure air duct on-off valve, the high-pressure air duct on-off valve should be quickly closed in time during the maintenance time of the roadheader, that is, when it is not tunneling, and then disconnected. 9.1 The connection of the high-pressure air duct and the high-pressure flexible air duct in the air duct reel or the air duct storage cylinder, the air duct reel or the air duct storage cylinder is rolled back by the motor, and the corresponding tunnel is laid in the area corresponding to the high-pressure flexible air duct before. Then connect the high-pressure air duct 9.1 to another air duct reel or the high-pressure flexible air duct in the air duct storage drum, and continue to perform high-pressure ventilation to ensure the normal ventilation and tunneling of the roadheader.

On the basis of the above embodiment, as a preferred embodiment, the secondary air duct 16 is provided with a secondary air blower 17 near the port of the air mixer 14 . The secondary fan 17 acts as a relay, which can relay the primary air discharged from the air mixer 14 through the horn-shaped end 15 and transport it to the working area deep in the tunnel through the secondary air duct 16, thereby realizing the ventilation and refrigeration system of the tunnel. The function of ventilation and cooling under continuous tunnel excavation.

On the basis of the above embodiment, as a preferred embodiment, the high-pressure air duct 9.1 is provided with a number of fifth on-off valves 9 at intervals, that is, the high-pressure air duct 9.1 is provided with fifth on-off valves 9 on both sides at a certain distance, When the high-pressure air duct 9.1 is worn and leaked, the fifth switch valve 9 on both sides can be closed in time for maintenance and replacement; When the high-pressure air duct 9.1 is removed from one high-pressure flexible air duct and connected to another high-pressure flexible air duct, it can also prevent the gas in the high-pressure flexible air duct from flowing back.

On the basis of the above embodiment, as a preferred embodiment, an air storage tank 3 is arranged between the air compressor 1, the expander 12 and the gas distribution pipeline, and the air storage tank 3 is connected with a safety valve 4 , the second switch valve 4.1 and the automatic drain valve 4.2. The air storage tank 3 is used to store compressed air and stabilize the compressed air; the safety valve 4.2 ensures the safety of the air storage tank and prevents the pressure of the air storage tank from suddenly increasing; the second on-off valve 4.1 controls the air storage tank 3. The on-off of the drainage pipeline; the automatic drainage valve 4.2 is used for automatic drainage. During normal operation, the second switch valve 4.1 is opened, and the gas tank 3 is automatically drained through the automatic drainage valve 4.2. When the second switch valve 4.1 is closed, The automatic drain valve 4.2 can be overhauled.

On the basis of the above embodiment, as a preferred embodiment, a pretreatment assembly is provided on the pipeline between the gas storage tank 3 and the expander 12, and the pretreatment assembly includes a filter 6 or/and a filter The water device 7 is provided with a third on-off valve 5 at the air inlet end of the pretreatment assembly, and a fourth on-off valve 8 on the air outlet end. The filter 6 performs multi-stage filtration on the compressed air, so that the air source entering the expander 12 is clean, and the subsequent workers in the tunnel can breathe safely; the water remover 7 further removes water from the compressed air to ensure that the air intake of the expander 12 is dry. , to prevent damage to the expander 12 when it is cooled to a low temperature below zero.

On the basis of the above-mentioned embodiment, as a preferred embodiment, two groups of the pretreatment assemblies are arranged in parallel, and the air inlet end of each group of pretreatment assemblies is provided with a third switch valve 5 , and the air outlet end is provided with a third switch valve 5 . The fourth switch valve 8 . The third on-off valve 5 and the fourth on-off valve 8 are closed at the same time to allow maintenance of the filter 6 or/and the water eliminator 7 in the middle. The group preprocessing component works continuously.

On the basis of the above embodiment, as a preferred embodiment, the air compressor 1 and the air storage tank 3 are both arranged outside the tunnel, and a second air compressor is arranged between the air compressor 1 and the air storage tank 3. An on-off valve 2, the first on-off valve 2 controls the on-off of the compressed air pipeline, which is convenient for maintenance of the corresponding air compressor 1.

On the basis of the above embodiment, as a preferred embodiment, the expander 12 is connected with a generator 13, and the useful work output by the expander 12 can be used to generate electricity. In addition to the generator 13, the expander 12 can also be connected to other components, which can make full use of the extra work generated in the expansion and refrigeration process.

The first on-off valve 2 , the third on-off valve 5 , the fourth on-off valve 8 , the fifth on-off valve 9 , and the sixth on-off valve 10 in the above-mentioned embodiment can be selected from manual ball valves, which are convenient for manual control, and can also be selected from automatic on-off valves. Valves, such as electromagnetic switch valves, pneumatic switch valves, etc. When the automatic switch valve is used, it can be connected to the control system to form a linkage control system with the air compressor and the expander, and automatically adjust the opening and closing of each valve according to the demand for ventilation, cooling capacity and pipeline extension.

The non-exhaustive parts of the present invention are conventional technical means known to those skilled in the art.

The above content shows and describes the basic principles, main features and beneficial effects of the present invention. The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (15)

1. A tunnel ventilation refrigerating system comprises an expansion machine (12) connected with an air compressor (1), and is characterized in that: the expansion machine (12) is communicated with a secondary air pipe (16) in the tunnel through an air mixer (14), and an air distribution pipeline connected with the expansion machine (12) in parallel is arranged between the air compressor (1) and the air mixer (14).

2. The tunnel ventilation refrigeration system of claim 1, wherein: a pressure reducing valve (12.1) is arranged on the gas distribution pipeline.

3. The tunnel ventilation refrigeration system of claim 2, wherein: the air mixer (14) comprises a mixer body (14.2) connected with the expansion machine (12) and the pressure reducing valve (12.1), and one-way valves (14.1) are arranged between the mixer body (14.2) and the expansion machine (12) and between the mixer body and the pressure reducing valve (12.1).

4. The tunnel ventilation refrigeration system of claim 3, wherein: the mixer body (14.2) is connected with a pressure gauge (14.3) or/and a pressure sensor.

5. The tunnel ventilation refrigeration system of any one of claims 1 to 4, wherein: the air compressor (1) is a variable frequency air compressor, a pressure sensor connected with the air mixer (14) forms an automatically-adjusted closed loop system with the air compressor (1) through a control system, the control system automatically adjusts the air compressor (1) according to refrigeration requirements, and the initial pressure is automatically adjusted according to tunneling distance and high-pressure air pipe resistance loss.

6. The tunnel ventilation refrigeration system of claim 5, wherein: and the exhaust end of the air mixer (14) is in spaced fit with the air inlet of the secondary air pipe (16) through a horn-shaped end head (15).

7. The tunnel ventilation refrigeration system of claim 6, wherein: a bypass valve (14.4) for detection is arranged between the horn-shaped end head (15) and the air mixer (14).

8. The tunnel ventilation refrigeration system of any one of claims 2 to 4, wherein: the air compressor is characterized in that the air inlet ends of the pressure reducing valve (12.1) and the expansion machine (12) are connected in parallel with two high-pressure soft air pipes, the two high-pressure soft air pipes are arranged on two air pipe winding drums (11) or two air pipe storage drums respectively, and the air compressor (1) is connected with one high-pressure soft air pipe through the high-pressure air pipe (9.1).

9. The tunnel ventilation refrigeration system of claim 8, wherein: and a secondary air fan (17) is arranged at the port of the secondary air pipe (16) close to the air mixer (14).

10. The tunnel ventilation refrigeration system of claim 6 or 7, wherein: a plurality of fifth switch valves (9) are arranged on the high-pressure air pipe (9.1) at intervals, and a sixth switch valve (10) is arranged at the end part of the high-pressure air hose connected with the high-pressure air pipe (9.1).

11. The tunnel ventilation refrigeration system of claim 10, wherein: and a gas storage tank (3) is arranged between the air compressor (1) and the expansion machine (12) and between the air distribution pipeline and the gas distribution pipeline, and the gas storage tank (3) is connected with a safety valve (4), a second switch valve (4.1) and an automatic drain valve (4.2).

12. The tunnel ventilation refrigeration system of claim 11, wherein: a pipeline between the air storage tank (3) and the expansion machine (12) is provided with a pretreatment assembly, the pretreatment assembly comprises a filter (6) or/and a dehydrator (7), the air inlet end of the pretreatment assembly is provided with a third switch valve (5), and the air outlet end of the pretreatment assembly is provided with a fourth switch valve (8).

13. The tunnel ventilation refrigeration system of claim 12, wherein: the pretreatment component is provided with two groups in parallel, the air inlet end of each group of pretreatment component is provided with a third switch valve (5), and the air outlet end is provided with a fourth switch valve (8).

14. The tunnel ventilation refrigeration system of claim 13, wherein: air compressor machine (1), gas holder (3) all set up outside the tunnel, all are provided with first ooff valve (2) between air compressor machine (1) and gas holder (3).

15. The tunnel ventilation refrigeration system of any one of claims 1-4, 6-7, 9, 11-14, wherein: the expander (12) is connected with a generator (13).

Images