A wellbore air intake heating system based on return air waste heat recovery
By arranging return air tunnels and heat exchangers underground and adopting a two-stage heat extraction method to recover waste heat from mine return air, the problems of high cost and high energy consumption in the utilization of waste heat from mine return air have been solved, realizing a low-cost and high-efficiency waste heat recovery and air supply solution.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- INNER MONGOLIA ZHONGTAI ENERGY GROUP CO LTD DAAN BRANCH
- Filing Date
- 2025-08-14
- Publication Date
- 2026-06-09
AI Technical Summary
Existing mine return air waste heat utilization technology relies on large steel structure projects, resulting in high construction costs and complex system energy consumption and management. Traditional return air waste heat utilization systems suffer from heat loss and increased energy consumption.
The system employs underground return air tunnels, gas-to-gas heat exchangers, and partitioned heat exchangers to recover waste heat from the return air through a two-stage heat extraction method. It also utilizes negative pressure air supply at the wellhead to reduce heat loss and system complexity.
It significantly reduces construction costs, improves waste heat recovery rate, reduces energy consumption and maintenance costs, has high system stability, excellent environmental performance, and adapts to different heating needs.
Smart Images
Figure CN224339029U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of mine return air waste heat utilization, specifically a shaft intake air heating system based on return air waste heat recovery. Background Technology
[0002] Currently, the direct utilization of waste heat from mine return air generally relies on large-scale steel structure projects, resulting in high overall construction costs. Existing technologies often involve installing ducts at the exhaust outlet of mine ventilation fans to introduce return air into heat exchange devices for energy recovery, but this method results in significant return air losses. Furthermore, traditional return air waste heat utilization systems are typically equipped with damper devices and multiple supply fans are configured to ensure system air supply capacity, increasing system energy consumption and complicating operation and management. Utility Model Content
[0003] The purpose of this invention is to provide a well intake air heating system based on return air waste heat recovery, which can effectively solve the problems mentioned in the background art.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] A shaft intake air heating system based on return air waste heat recovery includes a return air roadway, an air-to-air heat exchanger installed in the return air roadway, and the roadway being connected to the return air duct; a partition-type heat exchanger is arranged in the return air duct and connected to the mine ventilation fan.
[0006] A further improvement of this utility model is that the return air tunnel, the gas-to-gas heat exchanger, the return air duct, and the partition-type heat exchanger are all located underground.
[0007] A further improvement of this invention is that the gas-to-gas heat exchanger is composed of multiple circular tube bundles and has an air inlet channel.
[0008] A further improvement of this invention is that the gas-to-gas heat exchanger is also connected to the No. 1 air inlet duct.
[0009] A further improvement of this utility model is that the No. 1 air inlet duct is made of brick-concrete structure and has an internal insulation layer of not less than 100mm.
[0010] A further improvement of this utility model is that the No. 1 air intake duct is connected to the air intake shaft.
[0011] A further improvement of this utility model is that the No. 1 air intake duct is provided with a branch channel connected to the No. 2 air intake duct.
[0012] A further improvement of this invention is that the partition wall heat exchanger is connected to the partition wall heat releaser through a liquid supply pipe and a liquid return pipe.
[0013] A further improvement of this invention is that a solution circulation pump is installed in the return pipe.
[0014] A further improvement of this invention is that the partition-type heat exchanger is connected to the No. 2 air inlet duct and the air inlet shaft.
[0015] Compared with the prior art, the present invention has at least the following beneficial technical effects:
[0016] This utility model provides a shaft intake air heating system based on return air waste heat recovery. The heat extraction duct, heat exchanger, and supply air duct are all located underground, significantly reducing heat loss, eliminating the need for complex steel structure supports, and greatly reducing construction costs. Addressing the insufficient efficiency of existing single-stage heat extraction systems, this design employs a two-stage return air heat extraction system, significantly improving the waste heat recovery rate. The system has a low installed load, relying solely on the negative pressure at the wellhead to achieve shaft air supply, resulting in low energy consumption, simple maintenance, and higher utilization of flue gas waste heat. The overall solution operates stably, has low maintenance costs, and excellent environmental and safety performance, possessing promising prospects for widespread application. Attached Figure Description
[0017] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.
[0018] Figure 1 This is a schematic diagram of the structure of a well intake air heating system based on return air waste heat recovery according to this utility model;
[0019] Explanation of reference numerals in the attached figures:
[0020] 1. Return airway; 2. Gas-to-gas heat exchanger; 3. No. 1 intake airway; 4. Intake air shaft; 5. Return airway; 6. Indirect heat exchanger; 7. Mine ventilation fan; 8. No. 2 intake airway; 9. Indirect heat exchanger; 10. Solution circulation pump; 11. Liquid supply pipe; 12. Liquid return pipe; 13. Air intake channel. Detailed Implementation
[0021] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of this invention. Therefore, the drawings and description are considered exemplary in nature and not restrictive.
[0022] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.
[0023] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.
[0024] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0025] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.
[0026] It should be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the scope of the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.
[0027] It should also be understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.
[0028] The accompanying drawings show various structural schematic diagrams according to embodiments of the present invention. These drawings are not to scale, and some details have been enlarged and may have been omitted for clarity. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.
[0029] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.
[0030] Example 1
[0031] like Figure 1 As shown, the present invention provides a shaft intake air heating system based on return air waste heat recovery, including a return air roadway 1, an air-to-air heat exchanger 2 installed in the return air roadway 1, and the roadway being connected to the return air duct 5; a partition-type heat exchanger 6 is arranged in the return air duct 5 and connected to the mine ventilation fan 7.
[0032] In this embodiment, the gas-to-gas heat exchanger 2 is composed of multiple circular tube bundles and has an air inlet channel 13. The gas-to-gas heat exchanger 2 is connected to the No. 1 air inlet channel 3.
[0033] In this embodiment, the No. 1 air intake duct 3 is directly connected to the air intake shaft 4, and the No. 1 air intake duct 3 is provided with a branch channel connected to the No. 2 air intake duct 8.
[0034] In this embodiment, the indirect heat exchanger 6 is connected to the indirect heat exchanger 9 via a liquid supply pipe 11 and a liquid return pipe 12. The liquid return pipe 12 is equipped with a solution circulation pump 10. The indirect heat exchanger 9 is connected to the No. 2 air inlet duct 8 and the air inlet shaft 4.
[0035] Example 2
[0036] like Figure 1 As shown, the present invention provides a shaft intake air heating system based on return air waste heat recovery, including a return air tunnel 1, an air-to-air heat exchanger 2 installed in the return air tunnel 1, and the return air tunnel 1 connected to the return air duct 5.
[0037] The gas-to-gas heat exchanger 2 is provided with an air inlet channel 13. The gas-to-gas heat exchanger 2 is connected to the No. 1 air inlet channel 3. The No. 1 air inlet channel 3 is directly connected to the air inlet shaft 4. The No. 1 air inlet channel 3 is provided with a branch channel connected to the No. 2 air inlet channel 8.
[0038] The return air duct 5 is equipped with a partition-type heat exchanger 6, which is connected to the mine ventilation fan 7.
[0039] The indirect heat exchanger 6 is connected to the indirect heat exchanger 9 through the liquid supply pipe 11 and the liquid return pipe 12. The liquid return pipe 12 is equipped with a solution circulation pump 10.
[0040] The partition-type heat exchanger 9 is connected to the No. 2 air inlet duct 8 and the air inlet shaft 4.
[0041] The working principle and usage process of this utility model are as follows: During winter heating, the return air absorbs residual heat in the underground roadway and then enters the air-to-air heat exchanger 2, which consists of multiple circular tube bundles, through the return air roadway 1, where it flows laterally on the outer wall of the tube bundles. Simultaneously, outdoor fresh air enters through the air inlet channel 13 and the inner cavity of the tube bundles, exchanging heat with the return air to complete the first stage of heat extraction. The heated fresh air is then sent into the air inlet shaft 4 through the air inlet pipe 3 under the negative pressure at the shaft opening.
[0042] After primary heat extraction, the return air enters the indirect heat exchanger 6 via return air duct 5. Heat exchanger 6 is filled with a low-temperature ethylene glycol solution. The return air exchanges heat with the solution through the pipe wall, achieving secondary heat extraction, and is then discharged outside the mine by the mine ventilation fan 7. The heat-absorbing ethylene glycol solution, under the action of the solution circulation pump 10, is transported to the indirect heat exchanger 9 via the return liquid pipe 12. A portion of the air in the air inlet duct 3 and the fresh air introduced through air inlet duct 8 enter the heat exchanger 9, exchange heat with the ethylene glycol solution, and are then sent into the air inlet shaft 4.
[0043] This invention achieves primary heat extraction between return air and fresh air through a gas-to-gas heat exchanger, utilizing the waste heat in the return air to preheat the fresh air, thus improving energy efficiency. Subsequently, a secondary heat extraction between the return air and the low-temperature ethylene glycol solution is achieved through a partition wall heat exchanger, further recovering heat from the return air and making heat recovery more thorough.
[0044] This invention employs a two-stage heat extraction method. Even when the efficiency of the first-stage heat extraction decreases, the second-stage heat extraction can still ensure a certain level of heat recovery, thus improving the stability and reliability of the entire system. Using ethylene glycol solution as the heat transfer medium, its stable physical properties and low volatility contribute to the long-term stable operation of the system.
[0045] This invention allows for flexible adjustment of the intake air temperature and heat recovery by modifying the mixing ratio of air and fresh air in the intake duct and the circulation flow rate of the ethylene glycol solution, thus adapting to different heating needs. The partition-type heat exchanger enables some air and fresh air to exchange heat with the heat-absorbing ethylene glycol solution, further regulating the intake air temperature and increasing the system's adjustability.
[0046] This invention reduces the need for external heat sources by recovering waste heat from the return air, thereby lowering energy consumption and operating costs. It also reduces heat waste caused by directly discharging return air, helping to reduce carbon emissions in the mine and meeting environmental protection requirements.
[0047] This invention utilizes the negative pressure at the wellhead to deliver heated fresh air into the air intake shaft, eliminating the need for additional air supply equipment and reducing system complexity and energy consumption.
[0048] In summary, this invention arranges the heat extraction duct, heat exchanger, and air supply duct underground, significantly reducing heat loss, eliminating the need for complex steel structure supports, and greatly reducing construction costs. Addressing the insufficient efficiency of existing single-stage heat extraction systems, this design employs a two-stage return air heat extraction system, significantly improving waste heat recovery rate. The system has a low installed load, relying solely on the negative pressure at the wellhead to achieve wellbore air supply, resulting in low energy consumption, simple maintenance, and higher utilization rate of flue gas waste heat. The overall solution operates stably, has low maintenance costs, and excellent environmental and safety performance, possessing promising prospects for widespread application.
[0049] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. It will be apparent to those skilled in the art that this utility model is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or basic characteristics of this utility model. Therefore, the embodiments should be considered exemplary and non-limiting in all respects. The scope of this utility model is defined by the appended claims rather than the foregoing description, and thus all variations falling within the meaning and scope of equivalents of the claims are intended to be included within this utility model. No reference numerals in the claims should be construed as limiting the scope of the claims.
[0050] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that can be understood by those skilled in the art. The above content is only for illustrating the technical concept of this utility model and should not be used to limit the scope of protection of this utility model. Any modifications made to the technical solutions based on the technical concept proposed by this utility model shall fall within the scope of protection of the claims of this utility model.
Claims
1. A wellhead air intake heating system based on return air waste heat recovery, characterized in that, It includes a return air roadway (1), in which a gas-to-gas heat exchanger (2) is installed, and the roadway is connected to the return air duct (5); a partitioned heat exchanger (6) is arranged in the return air duct (5) and connected to the mine ventilation fan (7).
2. The wellhead air intake heating system based on return air waste heat recovery according to claim 1, characterized in that, The return air tunnel (1), the gas-to-gas heat exchanger (2), the return air duct (5), and the partition wall heat exchanger (6) are all located underground.
3. A wellhead air intake heating system based on return air waste heat recovery according to claim 1, characterized in that, The gas-to-gas heat exchanger (2) consists of multiple circular tube bundles and has an air inlet channel (13).
4. A well intake air heating system based on return air waste heat recovery according to claim 1, characterized in that, The gas-to-gas heat exchanger (2) is also connected to the No. 1 air inlet duct (3).
5. A wellhead air intake heating system based on return air waste heat recovery according to claim 4, characterized in that, The No. 1 air intake duct (3) is made of brick-concrete structure and has an internal insulation layer of not less than 100mm.
6. A well intake air heating system based on return air waste heat recovery according to claim 4, characterized in that, The No. 1 air intake duct (3) is connected to the air intake shaft (4).
7. A well intake air heating system based on return air waste heat recovery according to claim 6, characterized in that, The No. 1 air intake duct (3) is connected to the No. 2 air intake duct (8) by a branch passage.
8. A well intake air heating system based on return air waste heat recovery according to claim 7, characterized in that, The indirect heat exchanger (6) is connected to the indirect heat returner (9) via a liquid supply pipe (11) and a liquid return pipe (12).
9. A wellhead air intake heating system based on return air waste heat recovery according to claim 8, characterized in that, The return pipe (12) is equipped with a solution circulation pump (10).
10. A well intake air heating system based on return air waste heat recovery according to claim 8, characterized in that, The partition-type heat exchanger (9) is connected to the No. 2 air inlet duct (8) and the air inlet shaft (4).