Ejecting type dry ice phase change cooling device

Abstract

The utility model provides an injection type dry ice phase change cooling device which is used for local cooling of a high-temperature environment in an underground coal mine. The device comprises an air supply section, a first-stage heat exchange section, a second-stage heat exchange section, an air outlet, a feeding port and the like. The air supply section is provided with an ejector for introducing hot air; dry ice is fed into the first-stage heat exchange section through a feeding port and absorbs heat from hot air to sublimate, so that the hot air in the heat exchange pipe is rapidly cooled; low-temperature carbon dioxide generated by sublimation is fed into the second-stage heat exchange section through a carbon dioxide leading-out opening in the heat exchange section, hot air cooled by the first-stage heat exchange section is cooled by low-temperature carbon dioxide gas again, and the cooled low-temperature air is discharged from an air outlet, so that a cool and comfortable working environment is provided for operators; the carbon dioxide gas is discharged from the discharge port. Efficient utilization of cold energy of dry ice is achieved through two-stage heat exchange, the device is convenient to move and use, the maintenance cost and the operation difficulty are remarkably reduced, and the operation safety and the production efficiency of places such as mines are further improved.

Description

Technical Field

[0001] This utility model relates to the field of coal mine cooling technology, and in particular to an ejector-type dry ice phase change cooling device. Background Technology

[0002] During coal mining, coal often has a high volatile content and a low ignition point. Influenced by the oxygen, sulfur, and water content of the coal, as well as environmental factors, it is highly susceptible to spontaneous combustion underground. Specifically, during mining or transportation, the internal temperature of underground coal seams continuously rises due to repeated oxidation reactions, eventually leading to combustion or even fire. This spontaneous combustion not only threatens the normal operation of mining production, but also jeopardizes the physical and mental health and safety of workers when underground temperatures are excessively high. Therefore, effective cooling and fire prevention measures must be adopted to reduce underground ambient temperature and minimize the risk of spontaneous combustion fires.

[0003] Based on this, the technology of physical cooling using the sublimation and heat absorption of dry ice (solid carbon dioxide) has emerged. Its core principle is that dry ice absorbs a large amount of latent heat during a phase change at room temperature and pressure. This not only effectively solves the problem of high-temperature environments underground and reduces the risk of spontaneous combustion, but also provides a relatively comfortable and safe working environment for underground personnel. Currently, existing dry ice phase change cooling devices can alleviate the problem of high temperatures underground to some extent, but they still have many shortcomings. For example, in the heat exchange section, the cooling capacity generated by the dry ice phase change is often not fully utilized; some of the cooling capacity of the carbon dioxide is directly discharged or wasted, leading to reduced cooling efficiency. Furthermore, existing devices, in order to meet certain pressure requirements, often have bulky designs for the feed inlet, resulting in high material costs and inconvenience for construction and maintenance.

[0004] Therefore, considering multiple requirements such as improving cooling efficiency, reducing equipment size and weight, and simplifying material feeding and operation and maintenance, there is an urgent need to provide an ejector-type dry ice phase change cooling device, which can be further optimized and improved based on existing technologies in order to achieve a more efficient and stable cooling and fire extinguishing effect. Utility Model Content

[0005] To address the aforementioned technical problems, an ejector-type dry ice phase change cooling device is provided. Based on existing cooling device structures, this invention aims to improve the utilization rate of carbon dioxide cooling capacity, reduce the device's own weight, and improve the arrangement and performance of the feeding port, thereby providing a better and safer working environment for underground operations.

[0006] The technical means adopted in this utility model are as follows:

[0007] An ejector-type dry ice phase change cooling device includes:

[0008] The first-stage heat exchange section is a hollow cylindrical structure with several heat exchange tubes inside. At the top of the first-stage heat exchange section, there is a feed port for adding dry ice and a carbon dioxide outlet.

[0009] An air supply section is located at the front end of the first-stage heat exchange section. At least one set of air supply devices is provided at the front end of the air supply section. The hot air introduced by the air supply devices enters the heat exchange tube of the first-stage heat exchange section. Dry ice introduced through the feeding port absorbs the heat in the hot air in the heat exchange tube and sublimates, so that the hot air in the heat exchange tube is cooled down rapidly.

[0010] A secondary heat exchange section is located at the end of the primary heat exchange section. The secondary heat exchange section is equipped with a carbon dioxide inlet. The carbon dioxide outlet draws low-temperature carbon dioxide gas generated by the sublimation of dry ice in the primary heat exchange section through a pipeline and sends it into the carbon dioxide inlet. The carbon dioxide inlet is connected to a carbon dioxide gas pipe located inside the secondary heat exchange section. The hot air cooled by the primary heat exchange section is cooled again by the low-temperature carbon dioxide gas, and the cooled low-temperature air is discharged from the air outlet. The carbon dioxide gas is discharged through the carbon dioxide outlet located on the secondary heat exchange section.

[0011] Furthermore, one or more carbon dioxide inlets are provided, and the number of carbon dioxide gas pipes matches the number of carbon dioxide inlets. The carbon dioxide gas pipes are in the form of spiral coils within the secondary heat exchange section.

[0012] Furthermore, the heat exchange tubes in the primary heat exchange section are fixed by heat exchange tube baffles at both ends.

[0013] Furthermore, the air supply device is an ejector, and the end of the air supply section is provided with an air inlet baffle. An air inlet ejector fixing ring for connecting the ejector is fixed on the air inlet baffle. The side of the air supply section connected to the primary heat exchange section is fixed by an air inlet steel gasket and a flange sleeved on the outside of the air supply section.

[0014] Furthermore, the end side of the air supply section is provided with a bent plate for fixing the high-pressure air filter, and the air outlet of the high-pressure air filter is connected to the air inlet of the ejector through a high-pressure air pipe.

[0015] Furthermore, the end of the secondary heat exchange section is provided with an air outlet baffle, the air outlet baffle is provided with an air outlet, and the side of the secondary heat exchange section connected to the primary heat exchange section is fixed by an air outlet steel gasket and a flange sleeved on the outside of the secondary heat exchange section.

[0016] Furthermore, a sealing cap is provided at the top of the feeding port, and a connecting frame is provided on the side of the feeding port. The connecting frame is connected to the connecting seat provided on the sealing cap via a connecting rod. A limiting clamp is provided at the end of the connecting rod. The limiting clamp cooperates with a limiting bolt provided on the opposite side of the feeding port to lock and seal the feeding port. The limiting bolt is fixed by a fixing seat provided on the side of the feeding port.

[0017] Furthermore, the top of the primary heat exchange section is provided with lifting lugs in the area near the air supply section and the secondary heat exchange section to facilitate hoisting.

[0018] Furthermore, a pressure gauge and a safety valve are provided at the top of the primary heat exchange section on the side away from the carbon dioxide outlet.

[0019] Furthermore, support frames are provided on both sides of the bottom of the primary heat exchange section, and drain pipes are provided at the bottom of the primary heat exchange section, the air supply section, and the secondary heat exchange section.

[0020] Compared with the prior art, the present invention has the following advantages:

[0021] 1. This utility model sets a carbon dioxide outlet at the top of the primary heat exchange section, and sends the low-temperature carbon dioxide gas generated by the sublimation of dry ice into the secondary heat exchange section through the pipeline, so that the cooling capacity of carbon dioxide is "reused" and a more complete cooling effect is achieved.

[0022] 2. This invention features a carbon dioxide inlet in the secondary heat exchange section and a carbon dioxide pipe (in the form of a spiral coil) for secondary cooling of the hot air cooled from the primary heat exchange section, further utilizing the cooling capacity of the carbon dioxide fluid itself. Because the spiral coil structure has advantages such as increased heat transfer area and extended fluid residence time, the carbon dioxide and the hot air flowing through the secondary heat exchange section achieve more complete heat exchange, thereby significantly improving cooling efficiency and reducing cooling waste.

[0023] 3. The feeding port of this utility model has been optimized compared with the prior art. Through the combination design of the side connecting frame, connecting rod and limiting bolt, the feeding port is locked and sealed with high strength after the dry ice is added, preventing the leakage of internal pressure or carbon dioxide gas. On the one hand, it improves the safety and stability of the equipment, and on the other hand, it ensures the continuous operation of the dry ice phase change process under pressure, providing reliable sealed conditions for subsequent efficient heat exchange.

[0024] In summary, the various structural components of this utility model work together to improve the utilization rate of dry ice cooling capacity through multi-stage heat exchange, reasonable layout, and efficient sealing, thus meeting the rapid cooling needs in underground or other special environments and providing a cool and comfortable working environment for operators. At the same time, it takes into account the convenience of operation, safety and reliability, and ease of maintenance of the equipment. The carbon dioxide gas emitted after the dry ice sublimates can dilute the oxygen content in the environment, providing a more efficient solution for fire prevention and extinguishing and improving the working environment.

[0025] Based on the above reasons, this utility model can be widely promoted in the fields of mine safety and coal mine cooling technology. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of an ejector-type dry ice phase change cooling device according to this utility model.

[0028] Figure 2 This is a side view of an ejector-type dry ice phase change cooling device according to the present invention.

[0029] Figure 3 for Figure 2 Sectional view along the AA direction.

[0030] Figure 4 This is a cross-sectional view of the air outlet pipe section of an ejector-type dry ice phase change cooling device according to this utility model.

[0031] In the diagram: 1. Main body of the device; 11. Air supply section; 111. Inlet baffle; 112. Inlet ejector fixing ring; 113. Inlet steel pad; 114. Third drain pipe; 12. Primary heat exchange section; 121. First drain pipe; 122. Carbon dioxide outlet; 13. Secondary heat exchange section; 131. Outlet baffle; 132. Outlet; 133. Second drain pipe; 134. Carbon dioxide inlet; 135. Carbon dioxide 136. Gas pipe; 14. Carbon dioxide exhaust port; 15. Support frame; 16. Feed port; 17. Connecting frame; 18. Connecting rod; 19. Connecting seat; 10. Fixing seat; 11. Limiting clamp; 12. Limiting bolt; 13. Lifting lug; 14. Heat exchange tube; 15. Heat exchange tube baffle; 16. Ejector; 17. Bending plate; 18. High-pressure air filter; 19. High-pressure gas pipe; 20. Flange; 21. Pressure gauge; 22. Safety valve. Detailed Implementation

[0032] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. In the description of the embodiments of the present utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connection" and "installation" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. In addition, "connection" can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed" means that they are connected to each other and the relative positional relationship remains unchanged after the connection. The directional terms mentioned in the embodiments of the present utility model, such as "inner", "outer", "top", "bottom", etc., are only for reference to the direction of the accompanying drawings. Therefore, the directional terms used are for better and clearer explanation and understanding of the embodiments of the present utility model, 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 on the embodiments of the present utility model. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present utility model.

[0033] like Figure 1 As shown, this utility model provides an ejector-type dry ice phase change cooling device. The main body 1 of the device consists of a primary heat exchange section 12, an air supply section 11, a secondary heat exchange section 13, and a feeding port 15. Several heat exchange tubes 17 are set in the primary heat exchange section 12 to cooperate with the secondary heat exchange section 13 to achieve multi-stage heat exchange. In actual application, the secondary heat exchange section 13 can be selectively installed according to the site conditions.

[0034] Specifically, the primary heat exchange section 12 is a hollow cylindrical structure, such as... Figure 2 As shown, a plurality of heat exchange tubes 17 arranged in an array are installed in the primary heat exchange section 12, and the two ends of the heat exchange tubes 17 are fixed by heat exchange tube baffles 171. The two ends of the primary heat exchange section 12 are respectively sealed to the air supply section 11 and the secondary heat exchange section 13 through flanges 3 and inlet steel gaskets 113 or outlet steel gaskets, thereby ensuring the airtightness of the gas exchange process and the strength of the equipment.

[0035] An air inlet baffle 111 is provided at the end of the air supply section 11. The air supply device can be a fan or an ejector 2. When the air supply device is an ejector 2, the air inlet ejector fixing ring 112 (e.g., provided on the air inlet baffle 111) is used. Figure 2 (as shown) to stabilize, preferably, the number of ejectors 2 can be one or more.

[0036] Furthermore, the end side of the air supply section 11 is provided with a bent plate 21 for fixing the high-pressure air filter 22. The outlet end of the high-pressure air filter 22 is connected to the air inlet of the ejector 2 through a high-pressure air pipe 23. The high-pressure air filter 22 filters out particulate matter or impurities in the external air, preventing impurities or dust from entering the system, effectively controlling the cleanliness, and improving the service life and operational reliability of the equipment. The gas entering the air supply section 11 forms a large airflow velocity under the action of the ejector 2, quickly guiding the external hot air into the first-stage heat exchange section 12, where it fully contacts the dry ice placed inside the first-stage heat exchange section 12 and completes heat exchange.

[0037] like Figure 4 As shown, a feeding port 15 is provided at the top of the primary heat exchange section 12. Dry ice is fed into the primary heat exchange section 12 through the feeding port 15. The top of the feeding port 15 is equipped with a sealing cover, and a connecting frame 151 is provided on the side. The connecting frame 151 is connected to the connecting seat 153 on the sealing cover through a connecting rod 152. The limiting clamp 155 at the end of the connecting rod 152 cooperates with the limiting bolt 156 on the opposite side of the feeding port 15 to fasten and lock the sealing cover. The limiting bolt 156 is secured by the fixing seat 154 to ensure that the feeding port 15 can be safely sealed under pressure. The cooperation of the connecting rod and the connecting frame can keep the sealing cover moving on a fixed trajectory, avoiding frequent disassembly or falling off. Since a secondary heat exchange section 13 is added, the low-temperature carbon dioxide gas generated after the dry ice sublimates is discharged, and the inside of the cooling device is not pressurized. Therefore, the structure is simplified, and the sealing effect of the feeding port 15 can still be achieved.

[0038] The dry ice absorbed heat from the hot air inside the heat exchange tube 17 and sublimated, forming low-temperature carbon dioxide gas. This gas was drawn out from the carbon dioxide outlet 122 at the top of the primary heat exchange section 12, and then piped to the carbon dioxide inlet 134 of the secondary heat exchange section 13. It then entered the spiral coiled carbon dioxide pipe 135, where its own cooling capacity provided "secondary cooling" to the hot air that had already been cooled by the primary heat exchange section 12. The cooled air was then discharged from the outlet, providing a cool and comfortable working environment for the workers. Finally, the carbon dioxide gas was discharged from the device through the carbon dioxide outlet 136, thus maximizing the utilization of cooling capacity and improving overall cooling efficiency. The secondary heat exchange section 13 is enclosed by an outlet baffle 131, with an outlet 132 on the baffle to discharge the cooled gas.

[0039] A pressure gauge 4 and a safety valve 5 are installed on the top side of the primary heat exchange section 12 away from the carbon dioxide outlet 122. These are used to monitor and protect the internal pressure, monitor and adjust the internal pressure at any time, release excessive pressure in a timely manner, and ensure the safe operation of the system.

[0040] Lifting lugs 16 are installed at the top of the primary heat exchange section 12 near the air supply section 11 and the secondary heat exchange section 13 to facilitate the hoisting of the entire device in the well or other work locations, reducing construction difficulty and manpower input.

[0041] In addition, to ensure stable placement, support frames 14 are added to both sides of the bottom of the primary heat exchange section 12. Furthermore, the bottom of the primary heat exchange section 12, the air supply section 11, and the secondary heat exchange section 13 are respectively equipped with a first drain pipe 121, a third drain pipe 114, and a second drain pipe 133, which can promptly remove accumulated liquid and impurities during equipment operation or maintenance, prevent pipe blockage or corrosion, and provide further assurance for the stable operation and service life of the system.

[0042] In use, the operator introduces dry ice into the first-stage heat exchange section 12 through the feeding port 15 and then seals the feeding port 15. External hot air is rapidly introduced into the air supply section 11 through the ejector 2 and flows through the heat exchange tubes 17 in the first-stage heat exchange section 12. The dry ice absorbs heat from the hot air in the heat exchange tubes 17 and sublimates at room temperature and pressure, causing the hot air in the heat exchange tubes 17 to cool down rapidly. After the hot air inside the first-stage heat exchange section 12 is cooled, it flows through the heat exchange tubes 17 to the second-stage heat exchange section 13, completing the first cooling process. The low-temperature carbon dioxide gas produced after dry ice sublimation is transported through carbon dioxide outlet 122 and pipeline to carbon dioxide inlet 134 of the secondary heat exchange section 13, and then enters carbon dioxide pipe 135. The hot air cooled by the primary heat exchange section 12 is further cooled by the low-temperature carbon dioxide gas, achieving secondary cooling. The cooled air is then discharged through outlet 132, providing a cool and comfortable working environment for operators. (The secondary heat exchange section 13 can be installed or not, depending on actual working conditions. When not installed, the hot air can be discharged after cooling by the primary heat exchange section 12.) The carbon dioxide gas is then discharged from carbon dioxide outlet 136, maximizing the utilization of cooling capacity and improving overall cooling efficiency. Pressure gauge 4 and safety valve 5 can monitor and protect the gas pressure inside the primary heat exchange section 12 in real time. Drain pipes installed in various parts (primary heat exchange section 12, air supply section 11, and secondary heating section 13) can discharge condensate and impurities when needed, preventing pipe blockage and equipment damage.

[0043] This invention can rapidly cool localized areas underground or in other high-temperature environments, and the low-temperature carbon dioxide gas produced by dry ice sublimation can be reused for secondary cooling and has auxiliary functions such as fire extinguishing or combustion suppression. The spiral coiled carbon dioxide gas pipe 135 in the secondary heat exchange section 13 significantly improves heat exchange efficiency; the air supply section 11, together with the ejector 2 and the high-pressure air filter 22, ensures the cleanliness and flow rate control of the incoming air. The overall device has a compact structure and is easy to maintain, providing a reliable guarantee for continuous and efficient cooling in coal mines or other special occasions.

[0044] The above embodiments are merely preferred embodiments of the present utility model and are not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An ejector-type dry ice phase change cooling device, characterized in that, include: The first-stage heat exchange section is a hollow cylindrical structure with several heat exchange tubes inside. At the top of the first-stage heat exchange section, there is a feed port for adding dry ice and a carbon dioxide outlet. An air supply section is located at the front end of the first-stage heat exchange section. At least one set of air supply devices is provided at the front end of the air supply section. The hot air introduced by the air supply devices enters the heat exchange tube of the first-stage heat exchange section. Dry ice introduced through the feeding port absorbs the heat in the hot air in the heat exchange tube and sublimates, so that the hot air in the heat exchange tube is cooled down rapidly. A secondary heat exchange section is located at the end of the primary heat exchange section. The secondary heat exchange section is equipped with a carbon dioxide inlet. The carbon dioxide outlet draws low-temperature carbon dioxide gas generated by the sublimation of dry ice in the primary heat exchange section through a pipeline and sends it into the carbon dioxide inlet. The carbon dioxide inlet is connected to a carbon dioxide gas pipe located inside the secondary heat exchange section. The hot air cooled by the primary heat exchange section is cooled again by the low-temperature carbon dioxide gas, and the cooled low-temperature air is discharged from the air outlet. The carbon dioxide gas is discharged through the carbon dioxide outlet located on the secondary heat exchange section.

2. The ejector-type dry ice phase change cooling device according to claim 1, characterized in that, One or more carbon dioxide inlets are provided, and the number of carbon dioxide gas pipes matches the number of carbon dioxide inlets. The carbon dioxide gas pipes are in the form of spiral coils in the secondary heat exchange section.

3. The ejector-type dry ice phase change cooling device according to claim 2, characterized in that, The heat exchange tubes in the primary heat exchange section are fixed by heat exchange tube baffles at both ends.

4. The ejector-type dry ice phase change cooling device according to claim 3, characterized in that, The air supply device is an ejector, and the end of the air supply section is provided with an air inlet baffle. An air inlet ejector fixing ring for connecting the ejector is fixed on the air inlet baffle. The side of the air supply section connected to the first-stage heat exchange section is fixed by an air inlet steel gasket and a flange sleeved on the outside of the air supply section.

5. The ejector-type dry ice phase change cooling device according to claim 4, characterized in that, The end side of the air supply section is provided with a bent plate for fixing the high-pressure air filter, and the air outlet of the high-pressure air filter is connected to the air inlet of the ejector through a high-pressure air pipe.

6. The ejector-type dry ice phase change cooling device according to claim 2, characterized in that, The end of the secondary heat exchange section is provided with an air outlet baffle, and the air outlet baffle is provided with an air outlet. The side of the secondary heat exchange section connected to the primary heat exchange section is fixed by an air outlet steel gasket and a flange sleeved on the outside of the secondary heat exchange section.

7. The ejector-type dry ice phase change cooling device according to claim 1, characterized in that, The top of the feeding port is provided with a sealing cover, and the side of the feeding port is provided with a connecting frame. The connecting frame is connected to the connecting seat provided on the sealing cover by a connecting rod. The end of the connecting rod is provided with a limiting clamp. The limiting clamp cooperates with the limiting bolt provided on the opposite side of the feeding port to lock and seal the feeding port. The limiting bolt is fixed by a fixing seat provided on the side of the feeding port.

8. The ejector-type dry ice phase change cooling device according to claim 1, characterized in that, The top of the primary heat exchange section is provided with lifting lugs near the air supply section and the secondary heat exchange section for easy hoisting.

9. The ejector-type dry ice phase change cooling device according to claim 1, characterized in that, A pressure gauge and a safety valve are installed at the top of the primary heat exchange section on the side away from the carbon dioxide outlet.

10. The ejector-type dry ice phase change cooling device according to claim 1, characterized in that, The bottom of the primary heat exchange section is provided with support frames on both sides, and the bottom of the primary heat exchange section, the air supply section and the secondary heat exchange section are all provided with drain pipes.

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