CN113739311B - Utility tunnel entrance section anti-condensation air supply device and implementation method - Google Patents

Abstract

The invention discloses an anti-condensation air supply device at the entrance section of a comprehensive pipe gallery and a realization method, comprising an air supply device arranged on the equipment layer of the comprehensive pipe gallery and a partition plate arranged in the corridor, and the integrated pipe gallery is separated by the partition plate. The internal space is divided into a cable hole area and a ventilation hole area, and the upper part of the cable hole area and the ventilation hole area are respectively provided with a post-treatment air supply port and a direct fresh air supply port. The present invention is provided with an automatic adjustment device and an adjustment valve, and the automatic adjustment device can automatically control the opening and closing of each air duct adjustment valve and the dehumidifier according to the air conditions inside and outside the pipe gallery. By analyzing the temperature and humidity of the air inside the pipe gallery and the temperature and humidity of the outside air, according to the difference in moisture content and the wall temperature of the pipe gallery, when it is judged that the fresh air will reach the condensation condition after entering the pipe gallery, the dehumidifier will be activated, thereby effectively reducing the integrated pipe gallery. Risk of condensation in the inlet section.

Description

An anti-condensation air supply device and realization method for the entrance section of a comprehensive pipe gallery

technical field

The invention relates to the technical field of air supply, in particular to an anti-condensation air supply device for the entrance section of a comprehensive pipe gallery and a realization method thereof.

Background technique

Due to its advantages of effectively avoiding the repeated excavation of roads and efficiently utilizing urban underground space, the integrated pipe gallery has developed rapidly in my country. At the same time, the problems existing in its construction and operation have been paid more and more attention. The dew condensation problem area of each cabin of the integrated pipe gallery, especially located in the middle and lower reaches of the Yangtze River and the coastal high humidity and heat climate in summer, is an urgent problem to be solved in ventilation design.

The integrated pipe gallery project is generally located in the space below 2.5m from the ground. Due to being surrounded by rock and soil or soil, the space is relatively closed, and the surrounding rock and soil temperature is basically constant and far lower than the temperature of a typical meteorological day in summer. In summer, when the hot and humid air with high external moisture content enters the pipe gallery through the vent, the contact between the hot and humid air and the low temperature wall of the pipe gallery is prone to condensation, and the leakage of groundwater causes the pipe gallery to be in a humid environment for a long time. This will have an impact on the main structure of the pipe gallery and the durability of the pipeline, brackets, and various detection devices.

At present, the methods for dehumidification of underground space include ventilation dehumidification, solid and liquid absorbent dehumidification, compression dehumidification and cooling dehumidification. Ventilation and dehumidification method means that when the moisture content of the outdoor air is lower than that of the underground space, mechanical ventilation is used to send it into the room to replace the air with high moisture content. The solid and liquid absorbent dehumidification, compression dehumidification and cooling dehumidification methods require special dehumidification equipment. Defogging and dehumidification methods have large equipment investment, often need to consume extra energy to dehumidify or regenerate hygroscopic agent, high operating energy consumption and large consumables; and the defogging timeliness is not good. Therefore, these methods cannot be used in the limited space of the integrated pipe gallery.

According to the length of the fire compartment (usually 200m), the integrated pipe gallery is equipped with air inlet and outlet respectively. Existing studies generally believe that the ventilation form of "air intake at one end and exhaust air at the other end" is conducive to the discharge of moist air inside the integrated pipe gallery. Some projects The measures of "increasing ventilation to relieve condensation" were adopted in China, but resulted in the result of "more ventilation, more humidity", resulting in an increase in the energy consumption of the ventilation system. At present, the main dehumidification measures are to dehumidify the air entering the pipe gallery from the outside, and then use the overall ventilation to reduce the air humidity of the integrated pipe gallery. Zhang Qinglin et al. invented a new type of integrated pipe gallery ventilation and defogging system (ZL201822014961.4), by setting two air supply fans, one exhaust fan, one total heat exchanger, one sensible heat exchanger, etc., the use of the pipe gallery The low-temperature exhaust gas inside and the outdoor high-temperature and high-humidity air conduct full heat exchange, so that the temperature difference between the fresh air sent into the pipe gallery and the air in the pipe gallery is reduced, and the moisture content is reduced. Min Yun et al. invented an integrated pipe gallery ventilation and defogging system (ZL202020531697.6), by setting the pipe gallery body, ventilation demister and outer pipe, etc., the ventilation demister and the preheated air flow along the heat exchange tube. Entering the pipe gallery body, it plays the role of ventilation and defogging in the pipe gallery body. Lv Jing invented an underground integrated pipe gallery dehumidification system (ZL202020918184.0). The inside of the exhaust pavilion is equipped with a driving mechanism, a horizontal partition and two smoke filters. wind, which is beneficial to reduce the humidity inside the main body of the pipe gallery.

A large number of investigations have shown that the area near the air inlet of the underground comprehensive pipe gallery is the area with the most serious condensation. Condensation is easy to occur when the wall is in contact, and the area far from the air inlet is less susceptible to dew condensation due to the less interference from the outside air. Therefore, it is necessary to take targeted measures for areas prone to condensation.

Considering that the integrated pipe gallery is a structure, only maintenance personnel usually enter, and the environmental sanitation requirements are far lower than the environmental requirements of the underground building space. When considering the dehumidification of the integrated pipe gallery, it is also necessary to consider reducing the energy consumption of the ventilation system. Therefore, it is very important to study and design an air supply device and its realization method for integrated pipe gallery anti-condensation.

SUMMARY OF THE INVENTION

In view of the problems existing in the prior art, the purpose of the present invention is to provide an anti-condensation air supply device and a realization method for the entrance section of a comprehensive pipe gallery. The device can determine a reasonable ventilation mode according to the air space parameters (temperature, humidity) inside and outside the pipe gallery, and can avoid condensation at the entrance caused by improper ventilation and the entry of air with high outdoor humidity into the pipe gallery.

In order to achieve the above object, the present invention has adopted the following technical solutions:

An anti-condensation air supply system at the entrance of a comprehensive pipe gallery, the air supply system is arranged in an underground comprehensive pipe gallery, and includes a partition plate and an air supply device arranged in the comprehensive pipe gallery, and the partition plate connects the inside of the integrated pipe gallery. The space is divided into a cable hole and a ventilation hole, and the upper part of one end of the cable hole and the ventilation hole is provided with a separate air supply device.

There are two partition plates, and the two partition plates are vertically and symmetrically arranged in the integrated pipe gallery to form two cable holes on both sides of the ventilation hole. A thermal insulation layer is provided on the side of the partition plate close to the inner wall of the integrated pipe gallery (the side of the cable hole). The partition plate is arranged in the area close to the air inlet, and its length can be adjusted according to the dehumidification requirements.

The air supply device includes an air supply main pipe, a ventilation hole branch pipe, a cable hole branch pipe and a cable hole dehumidification branch pipe. One end of the air supply main pipe is provided with a variable frequency fan, an automatic adjustment device is installed in the air supply main pipe, each branch pipe is provided with a regulating valve, a dehumidifier is installed in the dehumidification branch pipe of the cable hole, and the other end of the air supply pipe is provided with a direct air supply port and treatment The air supply ports correspond to the air supply of the cable hole and the air supply of the ventilation hole respectively.

Compared with the prior art, the present invention has the following technical advantages:

Regional separation, focus on processing. Considering the contact between the outside hot and humid air and the low temperature wall surface of the pipe gallery to cause condensation, the parts of the integrated pipe gallery that need to be dehumidified are separated. There is a partition plate in the area near the air inlet, which divides the internal space of the integrated pipe gallery into one ventilation hole area and two cable hole areas. Focus on the anti-condensation air supply treatment for the cable hole area that is prone to condensation, which is more targeted and more efficient.

Automatic control, intelligent linkage. The invention is equipped with an air volume loop conversion system, which can automatically select the working condition according to the air parameters conditions inside and outside the pipe gallery, control the start and stop of the dehumidifier and the opening and closing of the regulating valve of each air supply pipe, and realize the automatic switching between the dehumidification working condition and the normal ventilation working condition. . For the case where the air moisture content is lower than that of the integrated pipe gallery at night in summer, local air supply can be used to reduce the air moisture content in the inlet section. In addition, the length of the separation area in the integrated pipe gallery is adjusted according to the dehumidification requirements.

Local treatment to achieve energy saving. Since the ventilation hole and the cable hole are respectively provided with air supply branch pipes, when the dehumidification condition is activated, only the external fresh air sent into the cable hole needs to be dehumidified to prevent condensation, and the air supply volume and dehumidification can be achieved. volume is greatly reduced. Compared with the overall air supply and dehumidification strategy of the pipe gallery, the invention reduces the equipment cost from the selection of the dehumidifier, reduces the operation and maintenance cost from the use of the dehumidifier, and reduces the energy use, and can achieve a relatively low cost solution. The problem of condensation in the pipe gallery can achieve the win-win goal of anti-condensation and energy saving.

The anti-condensation air supply device at the entrance of the integrated pipe gallery is characterized in that it includes an air supply device 1, a partition plate 2, a cable hole 3, a ventilation hole 4, a thermal insulation layer 5, an air supply main pipe 6, and a ventilation hole branch pipe 7 , Cable hole branch pipe 8, cable hole dehumidification branch pipe 9, variable frequency fan 10, automatic adjustment device 11, regulating valve 12, dehumidifier 13, direct air supply port 14, treatment air supply port 15.

Specifically, the anti-condensation air supply device and implementation method at the entrance of the integrated pipe gallery include:

S1. The sensor obtains the dry bulb temperature t _Ng and the moisture content d _N in the integrated pipe gallery, the dew point temperature t _lw and the moisture content d _w of the outdoor air, and the automatic adjustment device 11 judges whether there is a risk of condensation in the ventilation according to the air parameters. When t _Ng < t _lw or t _Ng > t _lw and d _N < d _w , the dehumidification condition is activated; when t _Ng > t _lw and d _N > d _w , the normal ventilation condition is activated.

S2. Under normal ventilation conditions, the automatic adjustment device 11 automatically opens the adjustment valves of the ventilation hole branch pipe 7 and the cable hole branch pipe 8, and closes the adjustment valve of the cable hole dehumidification branch pipe 9 at the same time, so that the outdoor fresh air without dehumidification treatment can pass through the direct air supply port. 14 and the processing air outlet 15 are sent into the pipe gallery.

S3. In the dehumidification condition, the automatic adjustment device 11 automatically opens the control valve of the dehumidification branch pipe 9 of the cable hole, and simultaneously closes the control valve of the branch pipe 7 of the ventilation hole and the branch pipe 8 of the cable hole, so that a small part of the dehumidified dry fresh air is processed through the air supply port 15 Feed into the cable hole 3.

The solution of the present invention will be further explained and described in detail below in conjunction with the accompanying drawings and specific embodiments.

Description of drawings

Fig. 1 is a flow chart of an anti-condensation air supply device and an implementation method at the entrance section of a comprehensive pipe gallery provided by an embodiment of the present invention;

Fig. 2 is the overall structure schematic diagram of the present invention;

Fig. 3 is the front view of the present invention;

Fig. 4 is the top view of the present invention;

Figure 5 is a side view of the present invention;

Fig. 6 is the nephogram of relative humidity distribution at 0.5m behind the clapboard of Example 1;

Figure 7 is a cloud map of the relative humidity distribution 2m behind the air inlet section of the traditional air supply method;

Fig. 8 is the nephogram of relative humidity distribution at 0.5m behind the clapboard of Example 2;

Fig. 9 is the nephogram of relative humidity distribution at 0.5m behind the clapboard of Example 3;

Figure 10 is a cloud map of relative humidity distribution at 0.5m behind the clapboard of Example 4;

Figure 11 is a cloud map of the relative humidity distribution at 0.5 m behind the clapboard of Example 5;

Figure 12 is the change curve of the shortest partition length when the moisture content difference between the outdoor and the inside of the pipe gallery is 3.3g/kg, 5.4g/kg, 7g/kg, 9.8g/kg and 11.4g/kg respectively.

Reference numeral description: air supply device 1, partition plate 2, cable hole 3, ventilation hole 4, insulation layer 5, air supply main pipe 6, ventilation hole branch pipe 7, cable hole branch pipe 8, cable hole dehumidification branch pipe 9, Inverter fan 10 , automatic adjustment device 11 , adjustment valve 12 , dehumidifier 13 , direct air supply port 14 , and processing air supply port 15 .

Detailed ways

The present invention provides an anti-condensation air supply device and a realization method at the entrance of the integrated pipe gallery, see Fig. 1 to Fig. 4 , the device is arranged in the underground integrated pipe gallery, and includes an air supply device arranged on the equipment layer of the integrated pipe gallery 1 and the partition plate 2 arranged in the corridor. The partition plate 2 divides the internal space of the integrated pipe gallery into a cable hole 3 and a ventilation hole 4. The upper part of one end of the cable hole 3 and the ventilation hole 4 is respectively provided with a processing air outlet 15 and direct air outlet 14. The present invention is provided with a dehumidifier 13, which can dehumidify the fresh air sent into the integrated pipe gallery, so as to directly and effectively avoid condensation and fogging in the integrated pipe gallery; an automatic adjustment device 11 and a control valve 12 are provided, and the automatic adjustment device 11 The opening and closing of each air duct regulating valve 12 and the dehumidifier 13 can be automatically controlled according to the air conditions inside and outside the pipe gallery. Only when the outside air humidity reaches the dew condensation condition, the dehumidifier 13 will be activated. The fresh air sent into the cable hole 3 is dehumidified, which can effectively save energy; a partition plate 2 is provided to separate the internal space of the integrated pipe gallery into one ventilation hole 4 and two cable holes 3, so that a small amount of dehumidification is processed. The dry fresh air enters the cable hole 3 through the processing air outlet 15 to prevent the fresh air that has not been dehumidified and the fresh air that has been dehumidified from contacting and mixing at the entrance section, thereby effectively reducing the risk of condensation at the entrance section of the integrated pipe gallery.

Specifically, two partition plates 2 are provided, and the two partition plates are vertically and symmetrically arranged in the integrated pipe gallery to form two cable holes 3 on both sides and a ventilation hole 4 in the middle. The two cable holes 3 in this embodiment are both surrounded by the side wall of the integrated pipe gallery and the partition plate 2. The cables are separated in a narrow space at the air supply inlet section to prevent the air in the cable hole 3 and the ventilation hole 4 in the inlet section. Air is mixed, and the dehumidified fresh air enters the cable hole 3 through the treatment vent 15, which can effectively avoid condensation and fogging in the cable hole.

Further, in another embodiment, a thermal insulation layer 5 is provided on the side of the partition plate 2 close to the inner wall of the integrated pipe gallery. The thermal insulation layer 5 can avoid heat exchange between the dry fresh air in the cable hole 3 and the untreated air in the ventilation hole 4, thereby reducing heat loss.

Further, in another embodiment, the air supply device 1 includes an air supply main pipe 6, a ventilation hole branch pipe 7 and a cable hole branch pipe 8, and one end of the air supply main pipe 6 is provided with a variable frequency fan 10. An automatic adjustment device 11 is provided, the cable hole branch pipe 8 is provided with a regulating valve 12 and a dehumidifier 13, and the other end of the air supply duct is provided with a direct air supply port 14 and a processing air supply port 15, corresponding to the ventilation hole 4 and the cable hole 3 respectively. air supply. The fresh air is introduced into the air supply main pipe 6 through the frequency conversion fan 10, and the humidity of the fresh air is detected by the automatic control device 11 in the air supply main pipe 6. If it does not exceed the set standard, the regulating valve 12 in the cable hole branch pipe 8 and the ventilation hole branch pipe 7 is opened. , directly into the cable hole 3 and the ventilation hole 4 from the air supply port; if the set standard is exceeded, there is a risk of condensation, the control valve 12 in the cable hole dehumidification branch pipe 9 and the ventilation hole branch pipe 7 is opened, and the cable will be sent into the hole. fresh air for dehumidification.

Example 1:

According to the actual situation, a numerical calculation model of the underground tunnel size of 2800(x)×20000(y)×2800(z)(mm ³ ) is established, and the partition plates are arranged 400mm from the side wall along the x-axis from the entrance of the pipe gallery on both sides. For summer working conditions, the difference between the internal and external moisture content is 3.3g/kg (take the outdoor parameter 32°C, 60%, and the indoor parameter 26°C, 70% as an example), and the total air supply volume after dehumidification on both sides is 784m3/ h, the material of the separator is made of stainless steel and set with a heat insulation layer, and the heat flux is 0W/m ² .

In order to verify the heat exchange effect between the air in the air supply duct and the air in the pipe gallery and the inner wall in this embodiment, the average turbulent energy model, that is, the standard k-ε two-equation model, is used to solve the equation system.

The shortest clapboard length in Example 1 is determined to be 5.2m through simulation. Figure 6 is the cloud map of the relative humidity distribution at 0.5m behind the clapboard in the pipe gallery in the case of Example 1. It can be seen from the figure that the relative humidity is 68-80 m. %, no condensation occurred.

The ventilation effect of the traditional pipe gallery is simulated, and the simulation results are shown in Figure 7. Figure 7 is the cloud map of the relative humidity distribution in the air inlet section (2m behind the air outlet) under the traditional air supply situation. The air supply device with dehumidification and no partition board directly sends the air into the pipe gallery, and the air humidity exceeds 100% (humidity exceeding 100% is regarded as condensation.)

In Example 1, compared with the traditional air inlet method of the pipe gallery, the humidity of the present invention is reduced, and there is no dew condensation in the pipe gallery. Therefore, the heat and humidity treatment system of the present invention can achieve the effect of preventing condensation.

Example 2:

The same numerical calculation model as in Example 1 was established, and the difference between the internal and external moisture content was changed to 5.4 g/kg (taking the outdoor parameter of 33°C, 60%, and the indoor parameter of 26°C, 65% as an example). The shortest clapboard length in Example 2 is determined to be 8.5m through simulation. Figure 8 is the cloud map of the relative humidity distribution at 0.5m behind the clapboard in the pipe gallery in the case of Example 2. It can be seen from the figure that the relative humidity is 72-80 m. %, no condensation occurred.

Example 3:

The same numerical calculation model as in Example 1 was established, and the difference between the moisture content inside and outside was changed to 7g/kg (taking the outdoor parameter of 35°C, 65%, and the indoor parameter of 26°C, 60% as an example). The shortest clapboard length in Example 3 is determined to be 10.7m through simulation. Figure 9 is the cloud map of the relative humidity distribution at 0.5m behind the clapboard in the pipe gallery in the case of Example 3. It can be seen from the figure that the relative humidity is 74-79 m. %, no condensation occurred.

Example 4:

The same numerical calculation model as in Example 1 was established, and the difference in moisture content between inside and outside was changed to 9.8 g/kg (taking the outdoor parameter of 33°C, 70%, and the indoor parameter of 26°C, 60% as an example). The shortest clapboard length in Example 4 was determined to be 13.5m by simulation. Figure 10 is the cloud map of the relative humidity distribution at 0.5m behind the clapboard in the pipe gallery in the case of Example 3. It can be seen from the figure that the relative humidity is 69-79 m. %, no condensation occurred.

Example 5:

The same numerical calculation model as in Example 1 was established, and the difference in moisture content between inside and outside was changed to 11.4 g/kg (taking the outdoor parameter of 35°C, 70%, and the indoor parameter of 26°C, 65% as an example). The shortest clapboard length in Example 5 is determined to be 13.5m through simulation. Figure 11 is the cloud map of the relative humidity distribution at 0.5m behind the clapboard in the pipe gallery in the case of Example 3. It can be seen from the figure that the relative humidity is 70-79 %, no condensation occurred.

This patent determines the shortest baffle length in this case by dehumidifying the air in the inlet section and using the difference in moisture content between inside and outside under different working conditions. Example 1, Example 2, Example 3, Example 4 and Example 5 are the shortest partition lengths determined by the difference in moisture content between the outdoor and the pipe gallery under different conditions. Compared with the traditional pipe gallery air supply system, the invented air supply system has obvious anti-condensation effect in summer conditions. Under different moisture content difference inside and outside, the length of the shortest separator is different, the greater the moisture content difference, the longer the required shortest separator length. The comparison results are shown in Figure 11.

Claims (4)

1. The utility model provides a utility tunnel entrance antisweat air supply arrangement, characterized in that, the device sets up in utility tunnel, including air supply arrangement (1) and division board (2) of setting in the corridor that set up in utility tunnel equipment layer, division board (2) divide utility tunnel internal space into two cable holes (3) and a ventilation hole (4), cable hole (3) one end upper portion with handle supply-air outlet (15) intercommunication, ventilation hole (4) one end upper portion with direct supply-air outlet (14) intercommunication; air supply arrangement (1) is including air supply main pipe (6), ventilation hole branch pipe (7) and cable hole branch pipe (8), the one end of air supply main pipe (6) is provided with variable frequency fan (10), air supply main pipe (6) other end is divided into ventilation hole branch pipe (7) and cable hole branch pipe (8), be provided with automatic regulating device (11) in air supply main pipe (6), cable hole branch pipe (8) are provided with governing valve (12) and dehumidifier (13), ventilation hole branch pipe (7) one end and air supply main pipe (6) intercommunication, the other end and direct supply-air outlet (14) intercommunication, correspond ventilation hole (4) air supply, cable hole branch pipe (8) one end and air supply main pipe (6) intercommunication, the other end passes through cable hole dehumidification branch pipe (9) and handles supply-air outlet (15) intercommunication, correspond cable hole (3) air supply.

2. The utility tunnel inlet section antisweat air supply arrangement of claim 1, characterized in that, division board (2) are provided with two, and two division boards are vertical and the symmetry sets up in the utility tunnel in order to form two cable holes (3) of both sides and a ventilation hole (4) in the middle of, and the length of division board is adjusted according to external environment and the interior environmental aspect of piping lane.

3. The inlet section anti-dewing air supply device for the utility tunnel according to claim 1, characterized in that one side of the partition plate (2) close to the inner wall of the utility tunnel is provided with an insulating layer (5).

4. The method for realizing the anti-dewing air supply device at the inlet section of the comprehensive pipe gallery according to any one of claims 1 to 3 is characterized by comprising the following steps:

s1, acquiring dry bulb temperature t in comprehensive pipe gallery by sensor_NgAnd moisture content d_NOutdoor air dew point temperature t_1wAnd moisture content d_wThe automatic adjusting device (11) judges whether the ventilation has the condensation risk or not according to the air parameters; when t is_Ng<t_1wOr t_Ng>t_1wAnd d is_N<d_wWhen the temperature is high, starting a dehumidification working condition; when t is_Ng>t_1wAnd d is_N>d_wWhen the ventilation is finished, starting a normal ventilation working condition;

s2, under the normal ventilation condition, the automatic adjusting device (11) automatically opens the adjusting valves of the ventilation hole branch pipe (7) and the cable hole branch pipe (8), and simultaneously closes the adjusting valve of the cable hole dehumidification branch pipe (9), so that outdoor fresh air is sent into the pipe gallery through the direct air supply outlet (14);

s3, under the dehumidification condition, the automatic adjusting device (11) automatically opens the adjusting valves of the cable hole branch pipe (8) and the cable hole dehumidification branch pipe (9), and simultaneously closes the adjusting valve of the ventilation hole branch pipe (7), so that a small part of dehumidified dry fresh air is delivered into the cable hole (3) through the processing air supply outlet (15).

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