Return air heat exchange platform
By designing a return air heat exchange platform, using baffles to guide water flow, air doors to control ventilation, and reverse air doors to regulate pressure, the problems of condensate freezing in mine return air and equipment failure were solved, achieving safe and reliable mine ventilation and equipment maintenance.
Patent Information
- Application Number
- CN202520091260.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-11-11
- Estimated Expiration
- 2035-01-15
AI Technical Summary
The high temperature and relative humidity of the mine return air cause condensate to drip into the connection between the return air heat exchange platform and the ventilation duct, forming ice and creating a safety hazard. Furthermore, the exhaust air from the return air heat exchanger escapes directly to the outside, which may lead to equipment failure and a short service life.
A return air heat exchange platform was designed, including a return air heat exchange chamber, a return air heat exchanger, a baffle plate, a damper, and a reverse damper. It is equipped with a maintenance passage and a pressure sensor. The baffle plate guides the water flow downward, the damper controls the ventilation direction, the reverse damper regulates the pressure, and the pressure sensor monitors the pressure difference to prevent condensate from freezing and equipment failure.
It effectively prevents safety hazards, extends the service life of equipment, ensures ventilation safety, and facilitates inspection and maintenance.
Smart Images
Figure CN223536385U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of mine waste heat utilization, and in particular to a return air heat exchange platform for exchanging heat with mine return air. Background Technology
[0002] Mine return air is characterized by large air volume, stable air temperature, high relative humidity, and good continuity, making it an excellent low-temperature waste heat resource. In winter, heat pumps can be used to extract waste heat from the return air to meet the needs of mine building heating, hot water preparation for bathing, and antifreeze heating at the mine entrance. In summer, mine return air can be used for cooling in buildings or for cooling down the mine.
[0003] Generally, a mine exhaust ventilation system's return air diffuser tower consists of two fans, one in operation and one on standby, running year-round. The mine return air heat exchange system includes a return air heat exchange platform located above the diffuser tower. Mine return air enters the platform from the diffuser tower via ventilation ducts. The heat exchanger on the platform allows heat exchange between the return air and the heat exchange medium, and the heat is then supplied to the heat-using units via a heat pump, thus utilizing the waste heat from the mine return air. Utility Model Content
[0004] Problems to be solved by the utility model
[0005] In existing technologies, mine return air temperatures are high and relative humidity is relatively high, resulting in a large amount of condensate dripping into the connection between the return air heat exchange platform and the ventilation duct, and then flowing into the diffusion tower. The condensate forming on the inner wall of the ventilation duct is prone to freezing, posing a safety hazard to mine ventilation. Furthermore, during heat exchange, the return air heat exchanger directly exhausts air outdoors, causing it to disperse in all directions. Condensate in the exhaust air may also splash, potentially leading to freezing and falling ice, among other safety hazards. Additionally, because the return air heat exchange platform is damp and contains impurities such as coal dust, instruments, valves, and other equipment installed within the platform are prone to malfunction and have short service lifespans.
[0006] Solution for solving the problem
[0007] A return air heat exchange platform, located near a return air diffusion tower, is used for heat exchange of mine return air. It is characterized by comprising: a return air heat exchange chamber, which serves as the main body of the platform; a return air heat exchanger disposed on the side wall of the chamber; and a baffle plate, which is erected vertically and surrounds the return air heat exchange chamber, wherein the height of the upper edge of the baffle plate is the same as the height of the top of the return air heat exchanger, or the difference between the height of the upper edge of the baffle plate and the height of the top of the return air heat exchanger is less than 10 cm.
[0008] The return air heat exchange platform is characterized in that the baffle plate is a corrugated plate, which can guide water to flow smoothly down.
[0009] The return air heat exchange platform is characterized in that a maintenance passage is provided outside the return air heat exchange chamber.
[0010] The return air heat exchange platform is characterized in that the maintenance passage is at least one of a pipe gallery set at the top of the return air heat exchange chamber and a pipe interlayer set at the bottom of the return air heat exchange chamber.
[0011] The return air heat exchange platform is characterized by further comprising: a damper, which is disposed at the connection between the return air diffuser tower and the return air heat exchange chamber, and is capable of opening and closing the diffuser port of the diffuser tower; and a reverse air damper, which is disposed on the top or side of the return air heat exchange chamber, and is capable of adjusting the internal pressure of the return air heat exchange chamber.
[0012] The return air heat exchange platform is characterized in that pressure sensors are respectively installed inside and outside the return air heat exchange chamber. When the pressure sensor detects that the pressure difference between the inside and outside of the return air heat exchange chamber is greater than a predetermined value, the reverse air door opens.
[0013] The return air heat exchange platform is characterized in that the damper is a horizontal automatic damper.
[0014] The return air heat exchange platform is characterized in that, when the reverse air door is installed on the top surface of the return air heat exchange chamber, it is a horizontal automatic air door.
[0015] The return air heat exchange platform is characterized in that the damper and the reverse damper are electric dampers or pneumatic dampers.
[0016] The return air heat exchange platform is characterized in that the return air heat exchanger is a partitioned return air heat exchanger with a heat exchange capacity surplus coefficient of 1.15 to 1.25.
[0017] Effects of the utility model
[0018] It can prevent safety hazards, extend the service life of equipment, and facilitate manual inspection and maintenance. Attached Figure Description
[0019] Figure 1 This is a side view showing the return air heat exchange platform according to this embodiment.
[0020] Figure 2 This is a front view showing the return air heat exchange platform according to this embodiment. Detailed Implementation
[0021] To make the objectives, technical solutions and advantages of this utility model clearer, the embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0022] <Example>
[0023] Mine return air is characterized by large volume, stable temperature, high relative humidity, and good continuity, making it an excellent source of low-temperature waste heat. In winter, return air heat exchange systems can extract heat from the mine return air for heating or warming purposes.
[0024] In the return air heat exchange system, two return air diffusion towers 2 are installed at the return air outlet of the mine. Fans 21 and 22 are installed in each of the two return air diffusion towers 2, with one fan in operation and the other on standby. For example, if fan 21 fails, fan 22 can be immediately activated to ensure the continuous operation of the mine ventilation system. The main function of the return air diffusion towers 2 is to dilute and diffuse the mine return air. When the mine return air rises from the bottom of the shaft to the return air outlet, due to the dispersing effect of the return air diffusion towers 2, the high concentration and high temperature of the return air mixes with the surrounding air, reducing the concentration and temperature of the return air and thus minimizing environmental pollution.
[0025] In this embodiment, a return air heat exchange platform 1 is set above the two return air diffuser towers 2, but there are no special limitations; the return air heat exchange platform 1 can also be set near the two return air diffuser towers 2. The return air heat exchange platform 1 is a highly efficient energy recovery facility, whose main function is to utilize the heat energy in the mine return air for heating or warming in winter. The following refers to... Figure 1 and Figure 2 This utility model relates to a return air heat exchange platform 1.
[0026] The main body of the return air heat exchange platform 1 involved in this embodiment is a return air heat exchange chamber R, which is rectangular or cubic in shape. A damper 12 is provided on the bottom surface of the return air heat exchange chamber R, and a reverse air damper 13 is provided on the top surface. A return air heat exchanger 11 is provided on the inner side of the return air heat exchange chamber R, and a baffle plate 14 and a maintenance passage 15 are provided on the outer side. The return air heat exchange chamber R also has a detection unit and a control unit (not shown).
[0027] In the return air heat exchange chamber R of the return air heat exchange platform 1, one or more return air heat exchangers 11 are installed. The return air heat exchangers 11 can be arranged in a single layer or multiple layers. Mine return air is introduced into the return air heat exchange chamber R through the return air duct of the return air diffuser tower 2 and enters the interior of the return air heat exchanger 11. During the heat exchange process, the mine return air exchanges heat with the heat medium in the return air heat exchanger 11. Since the mine return air itself has a certain temperature, it can transfer heat to the heat medium in the return air heat exchanger 11. In this process, the temperature of the mine return air decreases, while the temperature of the heat medium in the return air heat exchanger 11 increases, thereby obtaining heat from the mine return air.
[0028] The core of the return air heat exchange platform 1 lies in the heat exchange structure of the return air heat exchanger 11. The return air heat exchanger 11 typically employs high-efficiency heat exchangers, such as plate, shell-and-tube, and finned tube types. Among these, a partitioned return air heat exchanger is preferred due to its high heat exchange performance and widespread application. More preferably, a partitioned return air heat exchanger with a heat exchange capacity surplus coefficient of 1.15 to 1.25 is used.
[0029] A damper 12 is located at the connection between the return air diffuser tower 2 and the return air heat exchange chamber R. It is sized to completely cover the diffuser opening of the return air diffuser tower 2. The damper 12 is activated to open and close the diffuser opening of the return air diffuser tower 2. For example, when one fan 22 is in use while the other fan 21 is on standby, the damper 12 is activated to close (cover) the diffuser opening of the other fan tower 2. Preferably, the damper 12 is a horizontal automatic damper capable of moving above the diffuser opening. For example, a track is provided near the diffuser opening, and the damper 12 moves along the track via pulleys to cover the top of the diffuser tower on the standby fan side. The damper 12 can also be used in other ways, as long as it can close the diffuser opening of the standby fan tower. Furthermore, the damper 12 can be a manual damper, a pneumatic damper (using compressed air as a power source and a pneumatic actuator to open and close the damper), or an electric damper (using an electric motor as a power source to open and close the damper).
[0030] Here, the damper 12 is located on the bottom surface of the return air heat exchange chamber R, but there are no special limitations. It only needs to be located at the connection between the return air diffuser tower 2 and the return air heat exchange chamber R, allowing the diffuser opening of the diffuser tower 2 to be opened and closed. By setting the damper 12 to close the backup return air diffuser opening, condensate dripping into the backup diffuser tower can be prevented. Therefore, in winter, this avoids a large amount of condensate dripping into the backup diffuser tower due to low outdoor temperatures and high mine return air temperatures and relative humidity, and also prevents condensate forming on the inner wall of the ventilation duct from freezing into ice, thus preventing safety hazards to mine ventilation.
[0031] A reverse air damper 13 is installed on the top or side of the return air heat exchange chamber R, and can adjust the internal pressure of the return air heat exchange chamber R. One or more reverse air dampers 13 can be installed. In this embodiment, two reverse air dampers 13, namely reverse air damper 131 and reverse air damper 132, are installed on the top surface of the return air heat exchange chamber R. The reverse air dampers 13 can also be installed on the side of the return air heat exchange chamber R (not shown), for example... Figure 1 The return air heat exchanger 11 is located in the return air heat exchange chamber. With the reverse air damper 13 installed on the top surface of the return air heat exchange chamber R, the reverse air damper 13 can be a horizontal automatic damper, similar to the damper 12. The reverse air damper 13 can be a manual damper, a pneumatic damper, or an electric damper. There are no particular restrictions on the number, location, or type of the reverse air dampers 13, as long as they can adjust the internal pressure of the return air heat exchange chamber R.
[0032] Pressure sensors P1 and P2 are installed inside and outside the return air heat exchange chamber R, respectively, and are connected to the control unit. When pressure sensors P1 and P2 detect that the pressure difference between the inside and outside of the return air heat exchange chamber R is greater than a predetermined value (e.g., 150 Pa), the control unit opens the reverse air door 13 to regulate the internal pressure of the return air heat exchange chamber R and ensure the safety of mine ventilation. In addition, when an accident occurs underground and reverse ventilation is required, the control unit opens the reverse air door 13 to increase the ventilation volume, ensuring smooth air intake of the return air heat exchange platform and thus ensuring the safety requirements of underground air supply.
[0033] The baffle 14 is configured to stand vertically and surround the return air heat exchange platform 1. The baffle 14 is located outside the return air heat exchange chamber R, rising from the bottom surface of the return air heat exchange platform 1, and its upper edge is approximately the same height as the top of the return air heat exchanger 11. Preferably, the height difference between the baffle 14 and the height of the return air heat exchanger 11 located at the top is within the range of 0cm-10cm. This is because if the baffle 14 is too high, it will result in a narrow return air exhaust space, increasing resistance and hindering return air exhaust. In severe cases, it may cause return air accumulation, affecting ventilation safety and causing unnecessary waste. However, if the baffle 14 is too low, it will not serve its intended purpose. By setting up the baffle plate 14, the exhaust air after heat exchange can be discharged upwards into the atmosphere in an orderly manner, avoiding the exhaust air from being scattered. It can also discharge the condensate carried in the exhaust air into the baffle plate 14 and then discharge it through the floor drain installed in the inner corridor. This can prevent the poor drainage, corrosion of the ground, and ice block falling caused by ice formation inside and outside the corridor.
[0034] The baffle 14 can be configured as a corrugated plate. At least the surface of the baffle 14 facing the return air heat exchanger 11 should be corrugated to increase the contact area between the corrugated plate and the water flow, providing more flow paths and guidance for the water. This allows the condensate carried in the return air to pass smoothly and quickly along the corrugations, preventing icing and other issues. Furthermore, the corrugated baffle also has a certain self-cleaning function. When water flows through the corrugated plate, it generates a certain scouring force, which helps to remove dirt and impurities from the surface of the corrugated plate, preventing blockages and sediment buildup.
[0035] The maintenance passage 15 is located outside the return air heat exchange chamber R to facilitate equipment inspection, maintenance, and upkeep. For example, pipes, valves, instruments, etc., originally placed inside the return air heat exchange chamber R can be placed in the maintenance passage 15, avoiding the problem of short equipment service life caused by the humid environment and impurities such as coal dust inside the return air heat exchange chamber. The height and width of the maintenance passage 15 only need to meet the passage needs of maintenance personnel and are not particularly limited. The maintenance passage 15 can be a pipe rack 151 set at the top of the return air heat exchange chamber R, or a pipe mezzanine 152 set at the bottom of the return air heat exchange chamber R and surrounding the diffuser tower 2. Only one of the pipe rack 151 and the pipe mezzanine 152 can be set, or both of them can be set.
[0036] The detection unit may include one or more temperature sensors T and one or more pressure sensors P. For example, the temperature sensor T may be located in the return air diffuser tower 2 near the return air heat exchange chamber R to detect the temperature of the mine return air, or it may be located outside the return air heat exchange chamber R to detect the temperature of the exhaust air after heat exchange. The pressure sensor P may include pressure sensors P1 and P2 located outside and inside the return air heat exchange chamber R, respectively, to detect the pressure inside and outside the return air heat exchange chamber R.
[0037] The control unit centrally controls the overall operation of the return air heat exchange platform 1. For example, the detection unit detects temperature and pressure, transmits the results to the control unit, which processes and analyzes the received data, determining, based on preset algorithms and logic, whether to activate the damper 12 or open the reverse air damper 13, etc. Additionally, the control unit can monitor the operating status of the return air heat exchange platform 1 based on the detection results from the detection unit to determine if a malfunction has occurred. In the event of a malfunction, the control unit activates the alarm system (not shown) to notify the operators to take appropriate measures.
[0038] The above are merely embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principle of this utility model should be included within the scope of the claims of this utility model.
Claims
1. A return air heat exchange platform, located near a return air diffuser tower, for exchanging heat with mine return air, characterized in that, have: The return air heat exchange chamber serves as the main body of the return air heat exchange platform; A return air heat exchanger, which is disposed on the side wall of the return air heat exchange chamber; and A baffle plate, configured to stand vertically and surround the return air heat exchange chamber. The height of the upper edge of the baffle plate is the same as the height of the top of the return air heat exchanger, or the difference between the height of the upper edge of the baffle plate and the height of the top of the return air heat exchanger is less than 10cm.
2. The return air heat exchange platform according to claim 1, characterized in that, The windbreak is a corrugated plate, which can guide water to flow smoothly.
3. The return air heat exchange platform according to claim 1, characterized in that, An inspection passage is provided on the outside of the return air heat exchange chamber.
4. The return air heat exchange platform according to claim 3, characterized in that, The maintenance access is at least one of a pipe gallery located at the top of the return air heat exchange chamber and a pipe interlayer located at the bottom of the return air heat exchange chamber.
5. The return air heat exchange platform according to claim 1, characterized in that, It also features: a damper, which is located at the connection between the return air diffusion tower and the return air heat exchange chamber, and can open and close the diffusion port of the diffusion tower; as well as A reverse air damper, located on the top or side of the return air heat exchange chamber, is used to adjust the internal pressure of the return air heat exchange chamber.
6. The return air heat exchange platform according to claim 5, characterized in that, Pressure sensors are installed inside and outside the return air heat exchange chamber. When the pressure sensor detects that the pressure difference between the inside and outside of the return air heat exchange chamber is greater than a predetermined value, the reverse air damper opens.
7. The return air heat exchange platform according to claim 5, characterized in that, The damper is a horizontal automatic damper.
8. The return air heat exchange platform according to claim 5, characterized in that, When the reverse air damper is located on the top surface of the return air heat exchange chamber, it is a horizontal automatic damper.
9. The return air heat exchange platform according to claim 8, characterized in that, The damper and the reverse damper are either electric dampers or pneumatic dampers.
10. The return air heat exchange platform according to claim 1, characterized in that, The return air heat exchanger is a partitioned return air heat exchanger with a heat exchange capacity surplus coefficient of 1.15 to 1.25.