Heat recovery device in ventilation air methane separation process

Abstract

The utility model discloses a heat recovery device in a ventilation air methane separation process. The heat recovery device comprises a recovery chamber after heat storage type high-temperature oxidation treatment of ventilation air methane, and a water inlet pipe and a water outlet pipe which are respectively arranged at the upper position and the lower position of the two sides of the recovery chamber, the heat exchange tube is mounted in the recovery chamber; the air inlet pipeline is communicated with one end of the heat exchange pipe and is used for introducing ventilation air methane into the heat exchange pipe; the ash scraping pipe is arranged in the heat exchange pipe in a sliding manner; the automatic cleaning function before and after heat exchange is achieved through the dust scraping pipe, attached dust is scraped off on the inner wall of the heat exchange pipe in advance, and the negative influence of the dust on the heat exchange effect is avoided. According to the design, the thermal resistance of the pipeline is optimized, the heat exchange efficiency is effectively improved, and a purer heat exchange environment is provided for subsequent gas recovery; according to the structural design of the sealing strip, specific requirements of a recovery chamber structure and heat recovery leakproofness are considered, soft iron sheets or chain link belts are selected, and flexible selection and replacement of the sealing strip are ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of exhaust gas separation, in particular to a heat recovery device for exhaust gas separation process. Background Art

[0002] Ventilation air methane (VAM) refers to coal mine gas with a methane concentration below 0.75%. Utilizing VAM has long been a global challenge. Due to its low concentration and the technical challenges of utilization, this methane has long been vented into the atmosphere, causing significant greenhouse gas pollution. Patent No. CN104906928A discloses a VAM oxidation device. While the high-temperature flue gas passes through a heat exchanger to heat the cold water entering the water inlet pipe, it does not clean dust from the recovery pipe during the heat exchange process.

[0003] Specifically, existing exhaust gas heat recovery devices lack a mechanism for cleaning the recovery pipe during the heat exchange process, making it difficult to flexibly and timely use the device for subsequent heat recovery of exhaust gas. Therefore, a new exhaust gas separation process heat recovery device is urgently needed to address this issue. Utility Model Content

[0004] The purpose of the utility model is to provide a heat recovery device for the separation process of exhaust gas to solve the problems in the above background.

[0005] The purpose of the utility model can be achieved through the following technical solutions:

[0006] A heat recovery device for the separation process of exhaust gas comprises: a recovery chamber after exhaust gas is treated by thermal storage high-temperature oxidation, and a water inlet pipe and a water outlet pipe respectively installed at upper and lower positions on both sides of the recovery chamber.

[0007] Also includes,

[0008] Heat exchange tubes, installed inside the recovery chamber,

[0009] The air inlet pipe is connected to one end of the heat exchange pipe and is used to introduce exhaust gas into the heat exchange pipe.

[0010] The scraper tube is slidably arranged in the heat exchange tube.

[0011] The air outlet pipe is connected to the other end of the heat exchange tube.

[0012] The extracted gas with a lower methane concentration is mixed with the collected ventilation gas to make the methane concentration after mixing reach about 1.2%. It is then introduced into a thermal storage high-temperature oxidation device for flameless oxidation. The hot gas is introduced into the recovery chamber through the air inlet pipe for heat exchange recovery. The water inlet pipe and the water outlet pipe, the air inlet pipe and the air outlet pipe are arranged at different heights to increase the contact path. At the same time, the scraper pipe scrapes the dust on the wall of the heat exchange pipe before and during the heat exchange process to improve the heat exchange efficiency.

[0013] Furthermore, a slide groove is provided in the middle of the upper plate of the recovery chamber, and a sealing strip is slidably provided in the slide groove.

[0014] Furthermore, the recovery chamber is provided with a limiting groove at the lower part of the side of the chute, the end of the sealing strip is fixedly connected to a limiting rod, and the limiting rod is adapted to the limiting groove.

[0015] Furthermore, connecting grooves are sequentially fixed between the chute and the plurality of heat exchange tubes.

[0016] Furthermore, connecting plates are sequentially fixed between the sealing strip and the plurality of scraping tubes, the connecting plates being adapted to the connecting grooves, and the scraping tubes being adapted to the heat exchange tubes. By setting the distance between the sliding structure of the sealing strip and the limiting grooves, one side of the sealing strips on both sides is pulled out and snapped into the limiting grooves, while the other side abuts against the outside of its corresponding sliding groove. This prevents the scraping tubes driven by the sealing strips from loosening or sliding due to uneven gravity distribution after scraping, ensuring that dust adhering to the heat exchange tube walls caused by the preceding air intake can be safely scraped under relatively airtight ventilation conditions, ensuring the cleaning effect of the tube walls and further improving the heat exchange efficiency after gas recovery.

[0017] Furthermore, a trapezoidal opening is provided at one end of the scraping pipe facing the air inlet duct, and the inner diameter of the trapezoidal opening gradually decreases from the air inlet direction. The trapezoidal opening allows dust to be collected centrally after entering and will not get stuck at the front end of the scraping pipe, thereby ensuring scraping efficiency.

[0018] Furthermore, the sealing strip is made of one of soft iron sheet and chain link belt, and one of them can be selected according to the structure of the recovery chamber and the degree of airtightness required.

[0019] Beneficial effects of the utility model:

[0020] 1. This utility model utilizes a scraping tube to achieve automatic cleaning before and after heat exchange, pre-scraping dust from the inner wall of the heat exchange tube, thus preventing its negative impact on heat exchange performance. This design optimizes the thermal resistance of the tube, effectively improving heat exchange efficiency and providing a purer heat exchange environment for subsequent gas recovery. The sealing strip structure design takes into account the specific requirements of the recovery chamber structure and heat recovery airtightness, using soft iron or chain link belts to ensure flexible selection and replacement of sealing strips.

[0021] 2. The connecting plate and connecting groove of the utility model provide flexibility in material transmission, ensure stable cooperation between the scraping pipe and the sealing strip, effectively prevent the scraping pipe from loosening during operation, and ensure the continuous high efficiency and safety of the heat recovery process; the design of the trapezoidal opening at the front end of the scraping pipe ensures the centralized collection of dust during the scraping process, avoids dust accumulation in the pipe, improves the scraping efficiency and the thoroughness of cleaning, and further ensures the stability of the heat exchange efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The present invention will be further described below with reference to the accompanying drawings.

[0023] Figure 1 This is a schematic diagram of the overall structure of the utility model in which the sealing strip is made of soft iron sheet;

[0024] Figure 2 It is a cross-sectional view of the heat exchange tube of the present utility model;

[0025] Figure 3 This is a schematic diagram of the connection between the sealing strip and the scraping pipe of the utility model;

[0026] Figure 4 This is a cross-sectional view of the utility model scraping tube;

[0027] Figure 5 This is a schematic diagram of the overall structure of the utility model in which the sealing strip is a chain link belt;

[0028] Figure 6 This is a schematic diagram of the position of the sealing strip and the slide groove of the utility model;

[0029] In the figure: 1. Recovery chamber; 2. Air inlet pipe; 3. Air outlet pipe; 4. Connecting groove; 5. Heat exchange tube; 6. Trapezoidal opening; 7. Sealing strip; 8. Slide groove; 9. Limiting groove; 10. Scraping tube; 11. Water inlet pipe; 12. Water outlet pipe; 13. Connecting plate; 14. Limiting rod. DETAILED DESCRIPTION

[0030] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] The exhaust gas (ultra-low concentration gas) comprehensive utilization and carbon reduction technology innovatively uses a new, independently structured, tapered exhaust gas collection hood to efficiently collect exhaust air, effectively increasing gas utilization and expanding installed capacity. This technology blends extracted gas with a low methane concentration with collected exhaust air, bringing the methane concentration to approximately 1.2%. The gas is then introduced into a thermal storage high-temperature oxidation unit for flameless oxidation into water and carbon dioxide, releasing a large amount of heat. This achieves oxidation and separation of the exhaust gas, leading to large-scale greenhouse gas emissions reductions. This system is combined with waste heat boilers and steam turbine generator sets for waste heat utilization and power generation. At the same time, it can be used to supply heat to external users through steam extraction from the steam turbine or main steam after temperature and pressure reduction. The combined heat and power system replaces existing small coal-fired (gas-fired) boilers in coal mine ventilation shafts, eliminating outdated production capacity and further reducing greenhouse gas emissions.

[0032] See also Figure 1 and Figure 2 As shown, a heat recovery device for the separation process of exhaust gas includes: a recovery chamber 1 after exhaust gas is treated by thermal storage high-temperature oxidation, and a water inlet pipe 11 and a water outlet pipe 12 respectively installed at upper and lower positions on both sides of the recovery chamber 1;

[0033] Also includes,

[0034] The heat exchange tube 5 is installed inside the recovery chamber 1;

[0035] The air inlet pipe 2 is connected to one end of the heat exchange pipe 5 and is used to introduce exhaust gas into the heat exchange pipe 5;

[0036] The scraper tube 10 is slidably arranged in the heat exchange tube 5;

[0037] The air outlet pipe 3 is connected to the other end of the heat exchange pipe 5.

[0038] The extracted gas with a lower methane concentration is mixed with the collected exhaust gas so that the methane concentration after mixing reaches about 1.2%. It is then introduced into a thermal storage high-temperature oxidation device for flameless oxidation, and the hot gas is introduced into the recovery chamber 1 through the air inlet pipe 2 for heat exchange recovery. The water inlet pipe 11 and the water outlet pipe 12, the air inlet pipe 2 and the air outlet pipe 3 are arranged at different heights to increase the contact path. At the same time, the scraper pipe 10 scrapes the dust on the wall of the heat exchange pipe 5 before and during the heat exchange process to improve the heat exchange efficiency.

[0039] A chute 8 is provided in the middle of the upper plate of the recovery chamber 1 , and a sealing strip 7 is slidably provided in the chute 8 .

[0040] The recovery chamber 1 is provided with a limiting groove 9 at the lower part of the side of the chute 8 , and the end of the sealing strip 7 is fixedly connected to a limiting rod 14 , which is adapted to the limiting groove 9 .

[0041] Connecting grooves 4 are fixedly connected between the chute 8 and the plurality of heat exchange tubes 5 in sequence.

[0042] See also Figure 3 As shown, connecting plates 13 are sequentially fixed between the sealing strip 7 and a plurality of scraping tubes 10. The connecting plates 13 are adapted to the connecting grooves 4, and the scraping tubes 10 are adapted to the heat exchange tubes 5. By setting the distance between the sliding structure of the sealing strip 7 and the limiting grooves 9, one side of the sealing strips 7 on both sides is pulled out and inserted into the limiting grooves 9, while the other side abuts against the outside of its corresponding chute 8. This ensures that the scraping tubes 10 driven by the sealing strips 7 will not loosen or slide due to uneven gravity distribution after scraping, ensuring that dust attached to the wall of the heat exchange tube 5 due to the previous air intake can be safely scraped under relatively closed ventilation conditions, ensuring the cleaning effect of the tube wall to further improve the heat exchange efficiency after gas recovery.

[0043] See also Figure 4 As shown, a trapezoidal opening 6 is provided inside the scraping pipe 10 at one end facing the air inlet duct 2, and the inner diameter of the trapezoidal opening 6 gradually decreases from the air inlet direction. The trapezoidal opening 6 allows dust to be collected after entering and will not get stuck at the front end of the scraping pipe 10, thereby ensuring scraping efficiency.

[0044] See also Figure 1 、 Figure 5 and Figure 6 As shown, the sealing strip 7 is made of a soft iron sheet or a chain link belt, and one of them can be selected according to the structure of the recovery chamber 1 and the degree of airtightness required.

[0045] The working principle of the utility model is: before heat exchange, the sealing strip 7 on one side is pulled out and slides in the slide groove 8, which drives the scraping pipe 10 to scrape the dust;

[0046] The hot gas after the thermal storage high-temperature oxidation treatment of the exhaust gas is passed into the air inlet pipe 2 and the recovery chamber 1 for heat exchange recovery, and the water pump is started to pass the cooling water into the water inlet pipe 11 for heat exchange;

[0047] During the heat exchange process, the sealing strip 7 can be pulled further to fit into the limiting groove 9, and the other side can be placed against the outside of the corresponding chute 8 to scrape off the newly entered hot air and dust.

[0048] After the heat exchange is completed, the hot water is discharged from the water outlet pipe 12 to the warm water chamber for collection.

[0049] The above describes an embodiment of the present invention in detail. However, the above content is only a preferred embodiment of the present invention and should not be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent application of the present invention.

Claims

1. A heat recovery device for separation of exhaust gas, characterized in that: include: A recovery chamber (1) after thermal storage high-temperature oxidation treatment of exhaust gas, and a water inlet pipe (11) and a water outlet pipe (12) respectively installed at upper and lower positions on both sides of the recovery chamber (1), Also includes, The heat exchange tube (5) is installed inside the recovery chamber (1). The air inlet pipe (2) is connected to one end of the heat exchange pipe (5) and is used to introduce exhaust gas into the heat exchange pipe (5). The scraping tube (10) is slidably arranged in the heat exchange tube (5). The air outlet pipe (3) is connected to the other end of the heat exchange pipe (5).

2. The heat recovery device for separation of exhaust gas according to claim 1, characterized in that: A sliding groove (8) is provided in the middle of the upper plate of the recovery chamber (1), and a sealing strip (7) is slidably provided in the sliding groove (8).

3. The heat recovery device for separation of exhaust gas according to claim 2, characterized in that: The recovery chamber (1) is provided with a limiting groove (9) at the lower part of the side of the slide groove (8), and the end of the sealing strip (7) is fixedly connected to a limiting rod (14), and the limiting rod (14) is adapted to the limiting groove (9).

4. The heat recovery device for separation of exhaust gas according to claim 2, characterized in that: Connecting grooves (4) are fixedly connected in sequence between the slide groove (8) and the plurality of heat exchange tubes (5).

5. The heat recovery device for separation of exhaust gas according to claim 2, characterized in that: A connecting plate (13) is fixedly connected in sequence between the sealing strip (7) and a plurality of scraping tubes (10); the connecting plate (13) is matched with the connecting groove (4); and the scraping tube (10) is matched with the heat exchange tube (5).

6. The heat recovery device for separation of exhaust gas according to claim 1, characterized in that: A trapezoidal opening (6) is provided inside one end of the scraping pipe (10) facing the air intake pipe (2), and the inner diameter of the trapezoidal opening (6) gradually decreases in the air intake direction.

7. The heat recovery device for separation of exhaust gas according to claim 2, characterized in that: The sealing strip (7) is made of either iron sheet or chain link belt.

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