Chimney with waste heat recovery function
By designing a waste heat recovery mechanism and a phase change heat storage mechanism in the chimney, combining the heat conducting medium and the phase change heat storage medium, the problem of waste heat in the flue gas cannot be effectively recovered, efficient waste heat recovery and heat energy reuse are achieved, and thermal pollution is reduced.
Patent Information
- Application Number
- CN202422274968.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-18
- Publication Date
- 2025-07-01
- Estimated Expiration
- 2034-09-18
AI Technical Summary
The existing chimney technology has failed to effectively recover waste heat from flue gas, resulting in heat waste and thermal pollution problems.
A chimney with waste heat recovery function is designed, and the waste heat recovery mechanism is combined with a phase change heat storage mechanism. Through the coordination of the heat conducting medium and the phase change heat storage medium, the waste heat in the flue gas is effectively recovered and stored.
It significantly improves waste heat recovery efficiency, reduces smoke exhaust temperature, reduces thermal pollution, and realizes the reuse of heat energy, improving energy utilization efficiency.
Smart Images
Figure CN223050509U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of industrial chimneys, in particular to a chimney with a waste heat recovery function. Background Art
[0002] In many core industrial fields such as electric power, iron and steel, and chemical industry, as an essential facility, the chimney bears the heavy responsibility of discharging the flue gas generated in the production process into the atmosphere. However, it cannot be ignored that these high-temperature flue gases contain rich heat energy resources. If these precious heat energies are directly released into the environment without being utilized, it not only means a huge waste of energy but also may cause non-negligible thermal pollution to the natural environment and affect the ecological balance.
[0003] Therefore, it is particularly important to develop chimney technologies with waste heat recovery functions. Content of the Utility Model
[0004] The technical problem to be solved by the utility model is to provide a chimney with a waste heat recovery function that can effectively recover the waste heat in the flue gas, help reduce the flue gas discharge temperature, and reduce thermal pollution in view of the deficiencies of the prior art.
[0005] The technical problem to be solved by the utility model is realized through the following technical solutions. The utility model is a chimney with a waste heat recovery function, which includes a waste heat recovery mechanism for sleeving on the chimney and a phase change heat storage mechanism for cooperating with the waste heat recovery mechanism. The waste heat recovery mechanism includes a waste heat recovery outer shell sleeved on the chimney, a waste heat recovery cavity is left between the waste heat recovery outer shell and the chimney, and a heat conduction medium is contained in the waste heat recovery cavity; the phase change heat storage mechanism includes a phase change heat storage outer shell, a phase change heat storage medium is contained in the phase change heat storage outer shell, and a phase change heat storage channel and a phase change heat release channel penetrating through the phase change heat storage outer shell are also arranged on the phase change heat storage outer shell. One end of the waste heat recovery cavity is communicated with one end of the phase change heat storage channel through a heat conduction medium output pipeline, the other end of the phase change heat storage channel is communicated with the top of the waste heat recovery box through a heat conduction medium return pipeline, and a heat conduction medium power pump is also installed on the heat conduction medium output pipeline.
[0006] The technical problem to be solved by the utility model can also be further realized through the following technical solutions. For the chimney with a waste heat recovery function described above, a plurality of heat pipes are also inserted on the chimney in the waste heat recovery cavity. The evaporation end of the heat pipe is arranged in the chimney, the condensation end of the heat pipe is arranged in the waste heat recovery cavity, and the connection part between the heat pipe and the chimney is hermetically connected.
[0007] The technical problem to be solved by the present utility model can also be further realized by the following technical solutions. For the chimney with the waste heat recovery function described above, the distance between two adjacent heat pipes from top to bottom decreases successively.
[0008] The technical problem to be solved by the present utility model can also be further realized by the following technical solutions. For the chimney with the waste heat recovery function described above, both the phase change heat storage channel and the phase change heat release channel are in a curved shape.
[0009] The technical problem to be solved by the present utility model can also be further realized by the following technical solutions. For the chimney with the waste heat recovery function described above, quick connectors are installed on the phase change heat storage outer shells at both ends of the phase change heat release channel.
[0010] The technical problem to be solved by the present utility model can also be further realized by the following technical solutions. For the chimney with the waste heat recovery function described above, the heat conduction medium is water or heat conduction oil.
[0011] The technical problem to be solved by the present utility model can also be further realized by the following technical solutions. For the chimney with the waste heat recovery function described above, the phase change heat storage medium is hydrated salt, metal alloy or carbonate.
[0012] The technical problem to be solved by the present utility model can also be further realized by the following technical solutions. For the chimney with the waste heat recovery function described above, heat insulation layers are sleeved on the outer sides of the waste heat recovery outer shell and the phase change heat storage outer shell.
[0013] Compared with the prior art, the beneficial effects of the present utility model are as follows:
[0014] 1. By directly sleeving the waste heat recovery outer shell outside the chimney through the waste heat recovery mechanism of the present utility model, a closed waste heat recovery cavity is formed, and the heat conduction medium contained inside can effectively absorb the high-temperature waste heat in the flue gas discharged from the chimney. This direct contact heat exchange method significantly improves the waste heat recovery efficiency, and a large amount of heat energy that would otherwise be directly discharged into the atmosphere can be recycled.
[0015] 2. Due to the effective operation of the waste heat recovery mechanism, when the flue gas passes through the waste heat recovery cavity, a large amount of heat energy carried by it is absorbed by the heat conduction medium and transferred to the phase change heat storage mechanism. This process directly leads to a significant reduction in the flue gas discharge temperature. Reducing the flue gas discharge temperature not only reduces heat pollution but also avoids the direct heat radiation and heating effect of the high-temperature flue gas on the surrounding environment, which is beneficial to improving the surrounding air quality.
[0016] 3. The utility model efficiently recovers the waste heat in the flue gas. This design significantly reduces the thermal pollution caused by the direct discharge of high-temperature flue gas. At the same time, the recovered waste heat can be further used for heating, hot water supply and other purposes, realizing the reuse of energy and improving the overall energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] Figure 1 is a schematic structural diagram of the utility model;
[0018] Figure 2 is a top view of the structure of the phase change heat storage housing of the utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0019] To make the objectives, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings of the utility model. Apparently, the described embodiments are some but not all of the embodiments of the utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the utility model without creative efforts shall fall within the protection scope of the utility model.
[0020] Referring to Figure 1-2 , a chimney with a waste heat recovery function includes a waste heat recovery mechanism for sleeving on the chimney 1 and a phase change heat storage mechanism for cooperating with the waste heat recovery mechanism. The waste heat recovery mechanism includes a waste heat recovery housing 2 sleeved on the chimney 1. A waste heat recovery cavity is left between the waste heat recovery housing 2 and the chimney 1, and a heat conducting medium 3 is contained in the waste heat recovery cavity. The waste heat recovery housing 2 is usually made of high-temperature resistant and corrosion-resistant materials, such as stainless steel or other metal alloys, to ensure its long-term stable operation in a harsh flue gas environment. And it is designed to closely fit the chimney 1, but with enough space to form a waste heat recovery cavity, so as to ensure that the heat conducting medium 3 can fully contact and absorb the heat of the flue gas in the chimney 1, realizing the waste heat recovery of the flue gas;
[0021] The phase change heat storage mechanism includes a phase change heat storage outer shell 5, in which a phase change heat storage medium 11 is contained. A phase change heat storage channel 6 and a phase change heat release channel 7 are also provided on the phase change heat storage outer shell 5 and penetrate through the phase change heat storage outer shell 5. The bottom of the waste heat recovery cavity is connected to one end of the phase change heat storage channel 6 through a heat transfer medium output pipe 8, and the other end of the phase change heat storage channel 6 is connected to the top of the waste heat recovery tank through a heat transfer medium return pipe 10. A heat transfer medium power pump 9 is also installed on the heat transfer medium output pipe 8. Similar to the waste heat recovery outer shell 2, the phase change heat storage outer shell 5 is also made of high-temperature resistant and corrosion-resistant materials and is connected to the waste heat recovery cavity through the heat transfer medium output pipe 8 and the heat transfer medium return pipe 10, so that the heat carried by the heat transfer medium 3 enters the phase change heat storage mechanism through the phase change heat storage channel 6, allowing the phase change heat storage medium 11 to absorb this heat and undergo a phase change, storing the thermal energy in the form of latent heat; the phase change heat release channel 7 is used to communicate with an external system or device, such as an external circulating water pipe, to release the stored heat when needed and output the thermal energy in the phase change heat storage medium 11 for external use; in actual application, the phase change heat storage mechanism can be installed on one side of the chimney 1 through an external bracket;
[0022] Preferably, both the phase change heat storage channel 6 and the phase change heat release channel 7 are curved to increase the length of the channels, extend the residence time of the heat transfer medium 3 in the channels, and thus improve the heat transfer and storage efficiency;
[0023] Quick connectors 12 are installed on the phase change heat storage outer shell 5 at both ends of the phase change heat release channel 7, facilitating the quick and convenient connection of the phase change heat storage mechanism with other systems or devices and improving the flexibility and scalability of use;
[0024] The heat transfer medium 3 is water or heat transfer oil. Water has good thermal conductivity and stability and low cost; while heat transfer oil can work at higher temperatures and is suitable for occasions requiring high-temperature waste heat recovery. The phase change heat storage medium 11 is hydrated salt, metal alloy or carbonate. These materials have a large latent heat storage capacity and good thermal stability, can absorb and release a large amount of heat during the phase change process, and are suitable for occasions requiring long-term heat storage and release.
[0025] In order to further improve the heat recovery efficiency, a number of heat pipes 4 are also inserted on the chimney 1 in the waste heat recovery cavity. The evaporation end of the heat pipe 4 is arranged inside the chimney 1, and the condensation end of the heat pipe 4 is arranged in the waste heat recovery cavity. The connection between the heat pipe 4 and the chimney 1 is hermetically connected. The heat pipe 4 is a highly efficient heat conduction element. It uses the phase change (evaporation and condensation) process of the working medium to transfer heat, and has extremely high thermal conductivity and isothermality. Inserting the heat pipe 4 on the chimney 1 in the waste heat recovery cavity can more effectively capture the heat in the high-temperature flue gas in the chimney 1 and quickly transfer it to the heat conduction medium 3 in the waste heat recovery cavity; preferably, the distance between two adjacent heat pipes 4 from top to bottom gradually decreases, mainly considering that the temperature of the flue gas gradually decreases during the upward process in the chimney 1, in order to more effectively recover the heat in the high-temperature section.
[0026] During actual use, heat insulation layers are sleeved on the outer sides of the waste heat recovery housing 2 and the phase change heat storage housing 5, which helps to reduce the heat loss of the waste heat recovery mechanism and the phase change heat storage mechanism during the working process and improve the heat recovery efficiency.
[0027] The specific working process of this application is as follows:
[0028] 1. Heat capture: During the upward process of the high-temperature flue gas in the chimney 1, the heat is transferred to the working medium in the heat pipe 4 through the evaporation end of the heat pipe 4. After the working medium is heated and evaporated, it condenses and releases heat at the condensation end of the heat pipe 4, and transfers the heat to the heat conduction medium 3 in the waste heat recovery cavity;
[0029] 2. Heat transfer: Under the action of the heat conduction medium power pump 9, the heat conduction medium 3 circulates between the waste heat recovery cavity and the phase change heat storage channel 6. The heat carried by the heat conduction medium 3 is transferred to the phase change heat storage medium 11 through the phase change heat storage channel 6, causing it to undergo a phase change and store heat;
[0030] 3. Heat storage and release: The phase change heat storage medium 11 undergoes a phase change after absorbing heat and stores a large amount of latent heat. When heat needs to be released, the flow rate and temperature of the phase change heat release channel 7 can be controlled to enable the phase change heat storage medium 11 to release heat and transfer it to an external system or device;
[0031] 4. Heat insulation: During the entire working process, the heat insulation layers on the outer sides of the waste heat recovery housing 2 and the phase change heat storage housing 5 effectively reduce the heat loss and the influence of the external environment on the internal temperature, improving the heat recovery efficiency and heat insulation performance.
Claims
1. A chimney with waste heat recovery function, characterized in that: It includes a waste heat recovery mechanism for being mounted on a chimney and a phase change heat storage mechanism for cooperating with the waste heat recovery mechanism. The waste heat recovery mechanism includes a waste heat recovery shell mounted on the chimney, a waste heat recovery chamber is left between the waste heat recovery shell and the chimney, and a heat transfer medium is contained in the waste heat recovery chamber. The phase change heat storage mechanism includes a phase change heat storage shell, a phase change heat storage medium is contained in the phase change heat storage shell, a phase change heat storage channel and a phase change heat release channel which are arranged through the phase change heat storage shell are also arranged on the phase change heat storage shell, the bottom of the waste heat recovery chamber is connected with one end of the phase change heat storage channel through a heat transfer medium output pipeline, the other end of the phase change heat storage channel is connected with the top of the waste heat recovery box through a heat transfer medium reflux pipeline, and a heat transfer medium power pump is also installed on the heat transfer medium output pipeline.
2. The chimney with waste heat recovery function according to claim 1 is characterized in that: A plurality of heat pipes are also installed on the chimney in the waste heat recovery chamber. The evaporation end of the heat pipe is arranged in the chimney, and the condensation end of the heat pipe is arranged in the waste heat recovery chamber. The junction between the heat pipe and the chimney is sealed.
3. The chimney with waste heat recovery function according to claim 2 is characterized in that: The distance between two adjacent heat pipes decreases from top to bottom.
4. The chimney with waste heat recovery function according to claim 1 is characterized in that: The phase-change heat storage channel and the phase-change heat release channel are both in a curved shape.
5. The chimney with waste heat recovery function according to claim 1 or 4, characterized in that: Quick-plug connectors are installed on the phase-change heat storage shells at both ends of the phase-change heat release channel.
6. The chimney with waste heat recovery function according to claim 1 is characterized in that: The heat transfer medium is water or heat transfer oil.
7. The chimney with waste heat recovery function according to claim 1 or 6, characterized in that: The phase-change heat storage medium is a hydrated salt, a metal alloy or a carbonate.
8. The chimney with waste heat recovery function according to claim 1, characterized in that: The outer sides of the waste heat recovery shell and the phase change heat storage shell are both provided with insulation layers.