A regenerator waste heat recovery system
By introducing a drain tank and heat exchanger into the heat accumulator, heat recovery from hot water and steam is achieved, solving the problem of low heat utilization caused by hot water retention and improving heat utilization and heat exchange efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HONGTA TOBACCO (GROUP) CO LTD
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-19
AI Technical Summary
The heat of the hot water retained in the existing heat storage device is not fully utilized, resulting in low heat utilization rate.
A waste heat recovery system for a thermal accumulator was designed. Hot water and steam are introduced into a drain tank through a drain pipe for flash evaporation. Heat exchange is carried out using a heat exchanger and a cooling water tank to transfer heat to the water in the storage tank. The system is automated by combining temperature and flow sensors to achieve efficient heat recovery and utilization.
This improves the heat utilization rate of the heat accumulator, enhances the heat exchange efficiency, fully recovers the heat of the hot water in the heat accumulator, and reduces energy waste.
Smart Images
Figure CN224382223U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the technical field of heat recovery equipment for tobacco equipment, and specifically to a waste heat recovery system for a heat accumulator. Background Technology
[0002] Some high-temperature furnaces in tobacco processing carry a large amount of heat during operation and use. If this heat is not recovered and utilized, it will result in a huge waste of energy. Therefore, the steam heat in the heat accumulator is usually recovered and utilized, and the heat is carried to other places where it is needed.
[0003] Because the hot steam inside the accumulator liquefies, high-temperature hot water remains at the bottom of the accumulator. The heat of this hot water is retained inside the accumulator, and the hot water retained inside the accumulator is not utilized, resulting in low heat utilization rate of the accumulator. Utility Model Content
[0004] This application provides a waste heat recovery system for a heat accumulator, which aims to improve the heat utilization rate of the heat accumulator.
[0005] In one embodiment, a waste heat recovery system for a heat accumulator is provided, comprising a heat accumulator body filled with hot steam; the bottom of the heat accumulator has a drain outlet, and further comprising: a drain tank having a first steam outlet and a wastewater outlet, a cooling water tank having a return outlet, a heat exchanger having a steam inlet and a steam outlet, and a water storage tank having a water inlet and a water outlet;
[0006] The sewage tank is connected to the sewage outlet via a sewage pipe; the sewage outlet is connected to the cooling water tank via a sewage pipe; the water in the sewage pipe passes through the cooling water tank and is discharged from the return port; the cooling water tank is connected to both the inlet and outlet of the water storage tank.
[0007] The first steam outlet is connected to the steam inlet of the heat exchanger via a first steam pipe; the steam inlet is connected to the steam outlet; the heat exchanger is connected to both the water inlet and the water outlet of the water storage tank.
[0008] The water storage tank is equipped with pumps at its outlet and on its drain pipe; the return port is connected to the deaerator via a return pipe, and the deaerator is connected to the heat storage tank via a pipeline. The drain tank is a flash tank; the heat storage tank contains high-temperature, high-pressure steam.
[0009] In one embodiment, the cooling water tank is provided with a second steam outlet; the sewage pipe is connected to the second steam outlet; and the second steam outlet is connected to the first steam pipe via a second steam pipe.
[0010] In one embodiment, the heat exchanger is also connected to a connecting pipe, which is further connected to a hot water pipe of an air conditioner.
[0011] In one embodiment, both ends of the connecting pipe are connected to the hot water pipe, and the two ends of the connecting pipe are spaced apart; a first valve body is provided on the connecting pipe, and a second valve body is provided on the hot water pipe located between the two ends of the connecting pipe.
[0012] Specifically, both the first valve body and the second valve body are flow regulating valves.
[0013] The cooling water tank is a sealed tank with multiple spaced cooling pipes inside. Each cooling pipe is connected to the inlet and outlet of the water storage tank. Sewage from the sewage pipe enters the cooling water tank and exchanges heat with the outer wall of the cooling water pipe, and then flows out from the return port. After some sewage evaporates, it enters the second steam pipe and flows into the first steam pipe through the second steam pipe.
[0014] The heat exchanger has a sealed cavity, which is divided into a first chamber and a second chamber by a partition. The first chamber is connected to the connecting pipe and the first circulation pipe, while the second chamber is connected to the first steam pipe and the steam outlet. The heat of the steam is exchanged through the partition.
[0015] Alternatively, the structure of the heat exchanger is the same as that of the cooling water pipe. The cooling water pipe of the heat exchanger is connected to the connecting pipe and the first circulation pipe. The steam inlet and steam outlet are connected to the interior of the heat exchanger. The steam exchanges heat by contacting the outer wall of the cooling water pipe.
[0016] In one embodiment, a pressure relief pipe is connected to the first steam pipe, and a safety valve is installed on the pressure relief pipe.
[0017] In one embodiment, a pressure regulating valve, a regulating valve, and a check valve are sequentially installed on the first steam pipe along the steam flow direction.
[0018] In one embodiment, temperature sensors and flow sensors are installed in the first steam pipe, the heat exchanger, the cooling water tank, the connecting pipe, and the hot water pipe.
[0019] Specifically, a heat meter is installed on the connecting pipe to calculate the energy of heat exchange. Temperature sensors are installed at the inlet and outlet of the heat exchanger to obtain the temperature difference, and the heat energy can be calculated based on the fluid flow rate.
[0020] The heat exchanger is equipped with an automatic steam vent valve and an automatic liquid vent valve. These are used to vent the steam and liquid inside the heat exchanger to facilitate maintenance and inspection.
[0021] In one embodiment, the system further includes a processor, and the first valve body, the second valve body, the safety valve, the regulating valve, the temperature sensor, and the flow sensor are all electrically connected to the processor.
[0022] Specifically, the hot water pipes are used to connect the air conditioners of different users. Each branch is equipped with a valve electrically connected to the processor. The processor adjusts the opening of the corresponding valve and the opening of the first and second valve bodies according to the heating needs of each user to achieve reasonable matching of heat source usage. A pressure gauge electrically connected to the processor is installed on the first steam pipe. When the pressure gauge signal exceeds the threshold, the processor opens the safety valve or adjusts the opening of the regulating valve to reduce the gas pressure in the first steam pipe.
[0023] In one embodiment, the inlet and outlet of the water storage tank are connected through a first circulation pipe; the heat exchanger is connected to the first circulation pipe.
[0024] Specifically, both the inlet and outlet of the heat exchanger are connected to a three-way valve. One port of the three-way valve is connected to the first circulation pipe, and the other port is connected to the connecting pipe.
[0025] In one embodiment, the inlet and outlet of the water storage tank are connected via a second circulation pipe; the cooling water tank is connected to the second circulation pipe.
[0026] The beneficial effects of this application are:
[0027] Hot water and / or hot steam at the bottom of the heat accumulator enter the drain tank through the drain pipe for flash evaporation. Steam comes out from the first steam pipe and enters the heat exchanger, where it exchanges heat with the water in the storage tank. The heat is transferred to the water in the storage tank, making it easier to use the hot water in the storage tank later.
[0028] Some hot water is discharged from the bottom of the drain tank and enters the cooling water tank through the sewage pipe. The hot water exchanges heat with the water in the storage tank, and the heat is transferred to the water in the storage tank, making it easier to use the hot water in the storage tank later.
[0029] By exchanging heat between the hot water and steam in a heat exchanger, and then exchanging heat between the hot water and the cooling water tank, the hot water exiting the heat accumulator is ensured to receive sufficient heat, thus improving heat exchange efficiency and effectiveness. This fully recovers and utilizes the heat from the hot water within the heat accumulator, increasing its heat utilization rate. Attached Figure Description
[0030] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0031] Figure 1 This is a schematic diagram of a waste heat recovery system according to an embodiment of this application;
[0032] Figure 2 This is a schematic diagram of the connection between the connecting pipe and the hot water pipe according to an embodiment of this application;
[0033] Figure 3 This is a schematic diagram of the control flow according to an embodiment of this application;
[0034] Labels for each item in the figure:
[0035] 1. Heat accumulator body; 11. Drain outlet; 2. Drain tank; 21. First steam outlet; 22. Sewage outlet; 23. Drain pipe; 3. Cooling water tank; 31. Return pipe; 32. Second steam pipe; 4. Heat exchanger; 41. Steam inlet; 42. Steam outlet; 43. First steam pipe; 431. Pressure regulating valve; 432. Regulating valve; 433. Check valve; 44. Connecting pipe; 45. First valve body; 46. Pressure relief pipe; 47. Safety valve; 5. Water storage tank; 51. First circulation pipe; 52. Second circulation pipe; 53. Three-way valve; 6. Pump body; 7. Hot water pipe; 71. Second valve body; 8. Temperature sensor; 9. Flow sensor; 10. Processor. Detailed Implementation
[0036] The specific embodiments of this application will be further described in detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this application, but are not intended to limit the scope of this application. Similarly, the following examples are only some embodiments of this application, not all embodiments. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.
[0037] 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.
[0038] 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 indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0039] 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 connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.
[0040] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0041] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0042] This application proposes improvements and innovations, and presents the following embodiments.
[0043] In some implementations, please refer to Figures 1 to 3 A waste heat recovery system for a heat accumulator is provided, including a heat accumulator body 1 filled with hot steam; the bottom of the heat accumulator has a drain port 11, and it also includes: a drain tank 2 with a first steam outlet 21 and a wastewater outlet 22, a cooling water tank 3 with a return outlet, a heat exchanger 4 with a steam inlet 41 and a steam outlet 42; and a water storage tank 5 with a water inlet and a water outlet.
[0044] Sewage tank 2 is connected to sewage outlet 11 via sewage pipe 23; sewage outlet 22 is connected to cooling water tank 3 via sewage pipe; water in sewage pipe is discharged from return port after passing through cooling water tank 3; cooling water tank 3 is connected to both inlet and outlet of water storage tank 5.
[0045] The first steam outlet 21 is connected to the steam inlet 41 of the heat exchanger 4 via the first steam pipe 43; the steam inlet 41 is connected to the steam outlet 42; the heat exchanger 4 is connected to both the inlet and outlet of the water storage tank 5.
[0046] Pumps 6 are installed on the outlet of the water storage tank 5 and the drain pipe 23; the return port is connected to the deaerator through the return pipe 31, and the deaerator is connected to the heat storage tank through a pipe. The drain tank 2 is a flash tank; the heat storage tank contains high-temperature and high-pressure hot steam.
[0047] Hot water and / or hot steam at the bottom of the heat accumulator enter the drain tank 2 through the drain pipe 23 for flash evaporation. Steam comes out from the first steam pipe 43 and enters the heat exchanger 4. The steam exchanges heat with the water in the water storage tank 5, and the heat is transferred to the water in the water storage tank 5, which is convenient for the use of hot water in the water storage tank 5 in the later stage.
[0048] Some hot water is discharged from the bottom of the drain tank 2 and enters the cooling water tank 3 through the sewage pipe. The hot water exchanges heat with the water in the storage tank 5, and the heat is transferred to the water in the storage tank 5, which facilitates the use of the hot water in the storage tank 5 later.
[0049] The hot water undergoes heat exchange with steam via heat exchanger 4, and with the hot water itself via a cooling water tank. This ensures that the hot water exiting the accumulator receives sufficient heat, improving heat exchange efficiency and effectiveness. It also fully recovers and utilizes the heat from the hot water within the accumulator, thus increasing the accumulator's heat utilization rate.
[0050] In some embodiments, the cooling water tank 3 has a second steam outlet; a sewage pipe is connected to the second steam outlet; the second steam outlet is connected to the first steam pipe 43 via a second steam pipe 32. Hot water entering the cooling water tank 3 evaporates to form hot steam, which then flows through the second steam pipe 32 into the first steam pipe 43, thus achieving heat recovery from the hot steam and improving the heat recovery efficiency of the heat accumulator.
[0051] In some embodiments, the heat exchanger 4 is also connected to a connecting pipe 44, which is further connected to the hot water pipe 7 of the air conditioner. Connecting the hot water pipe 7 of the air conditioner to the connecting pipe connects the hot water in the air conditioner's hot water pipe 7 to the heat exchanger 4. The hot water in the hot water pipe 7 exchanges heat with the steam in the first steam pipe 43, thereby heating the hot water in the hot water pipe. This fully utilizes the heat of the hot water in the heat storage device, reduces the energy required to heat the hot water in the hot water pipe 7, and lowers costs.
[0052] In some embodiments, both ends of the connecting pipe 44 are connected to the hot water pipe 7, and the two ends of the connecting pipe 44 are spaced apart. A first valve body 45 is provided on the connecting pipe 44, and a second valve body 71 is provided on the hot water pipe 7 located between the two ends of the connecting pipe 44. The first valve body 45 and the second valve body 71 can control whether the hot water in the hot water pipe 7 needs to be connected to the heat exchanger 4. That is, when the steam temperature of the first steam pipe 43 is higher than the hot water temperature of the hot water pipe 7, the first valve body 45 is opened and the second valve body 71 is closed, so that the air conditioning hot water is connected to the heat exchanger 4 for heat exchange.
[0053] Specifically, both the first valve body 45 and the second valve body 71 are flow regulating valves 432. Using flow regulating valves 432 makes it easy to control the flow rate of air conditioning hot water connected to the heat exchanger 4.
[0054] The cooling water tank 3 is a sealed tank containing multiple spaced-apart cooling pipes, each connected to the inlet and outlet of the water storage tank 5. Wastewater from the sewage pipe enters the cooling water tank 3, exchanges heat with the outer wall of the cooling water pipes, and flows out from the return port. Some of the wastewater evaporates and enters the second steam pipe 32, then flows into the first steam pipe 43. The cooling water tank 3 has a simple and reasonable structure.
[0055] The heat exchanger 4 has a sealed cavity, which is divided into a first chamber and a second chamber by a partition. The first chamber is connected to the connecting pipe 44 and the first circulation pipe 51; the second chamber is connected to the first steam pipe 43 and the steam outlet 42. Heat exchange of the steam is achieved through the partition. The sealed chamber design allows high-pressure hot steam to buffer before entering the second chamber when steam is supplied through the first steam pipe 43, thus preventing the hot steam from impacting the inner wall of the chamber.
[0056] Alternatively, the structure of heat exchanger 4 can be the same as that of cooling water pipes. The cooling water pipes of heat exchanger 4 are connected to connecting pipe 44 and the first circulation pipe 51. The steam inlet 41 and steam outlet 42 are connected to the interior of heat exchanger 4, and steam exchanges heat through contact with the outer wall of the cooling water pipes. This design is simple and reasonable.
[0057] In some embodiments, a pressure relief pipe 46 is connected to the first steam pipe 43, and a safety valve 47 is provided on the pressure relief pipe 46. The safety valve 47 facilitates the pressure relief of the steam in the first steam pipe 43 to ensure that the gas pressure in the first steam pipe 43 remains stable.
[0058] In some embodiments, a pressure regulating valve 431, a regulating valve 432, and a check valve 433 are sequentially arranged on the first steam pipe 43 along the steam flow direction. After the steam passes through the pressure regulating valve 431 and the regulating valve 432, the steam pressure can be greatly reduced, ensuring the safe use of the heat exchanger 4 and improving the service life of the heat exchanger 4.
[0059] In some embodiments, temperature sensors 8 and flow sensors 9 are provided in the first steam pipe 43, heat exchanger 4, cooling water tank 3, connecting pipe 44, and hot water pipe 7. The temperature sensor 8 can obtain the temperature information of the corresponding pipe, and the flow sensor 9 can obtain the flow rate of the corresponding pipe; so as to facilitate the user's decision to open or close the corresponding valve and other operations.
[0060] Specifically, a heat meter is installed on the connecting pipe 44 to calculate the energy of heat exchange. That is, temperature sensors 8 are installed at the inlet and outlet of the heat exchanger 4 to obtain the temperature difference, and the heat energy can be calculated based on the flow rate of the fluid.
[0061] The heat exchanger 4 is equipped with an automatic steam vent valve and an automatic liquid vent valve. These are used to vent the steam and liquid inside the heat exchanger 4 to facilitate maintenance and inspection.
[0062] In some embodiments, the system further includes a processor 10, and the first valve body 45, the second valve body 71, the safety valve 47, the regulating valve 432, the temperature sensor 8, and the flow sensor 9 are all electrically connected to the processor 10. By rationally adjusting the corresponding heat flow direction and distribution through the processor 10 system, heat exchange efficiency and heat exchange effect can be improved, and the degree of system automation can be increased.
[0063] Specifically, hot water pipe 7 is used to connect air conditioners for different users. Each branch is equipped with a valve electrically connected to processor 10. Processor 10 adjusts the opening of the corresponding valve and the opening of the first valve body 45 and the second valve body 71 according to the heating needs of each user to achieve reasonable matching of heat source usage. A pressure gauge electrically connected to processor 10 is installed on the first steam pipe 43. When the pressure gauge signal exceeds the threshold, processor 10 opens safety valve 47 or adjusts the opening of regulating valve 432 to reduce the gas pressure in the first steam pipe 43.
[0064] In some embodiments, the inlet and outlet of the water storage tank 5 are connected through a first circulation pipe 51; the heat exchanger 4 is connected to the first circulation pipe 51. The water in the water storage tank 5 is continuously heated through the first circulation pipe 51.
[0065] Specifically, both the inlet and outlet of the heat exchanger 4 are connected to a three-way valve 53. One port of the three-way valve 53 is connected to the first circulation pipe 51, and the other port is connected to the connecting pipe 44. In some embodiments, the inlet and outlet of the water storage tank 5 are connected through a second circulation pipe 52; the cooling water tank 3 is also connected to the second circulation pipe 52. The water in the water storage tank 5 is continuously heated through the second circulation pipe 52.
[0066] The outlet and inlet of the water storage tank 5 are also equipped with the same three-way valve 53, and the three-way valve 53 of the outlet and inlet of the water storage tank 5 are connected to the first circulation pipe 51 and the second circulation pipe 52.
[0067] All three-way valves 53 are electrically connected to the processor 10, which improves the automation level of the system.
[0068] The above are merely optional embodiments of this application and are not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application. Although embodiments of this utility model have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting this utility model. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of this utility model.
Claims
1. A waste heat recovery system for a heat accumulator, comprising a heat accumulator body filled with hot steam; the bottom of the heat accumulator having a drain port, characterized in that, It also includes: a sludge tank with a first steam outlet and a sewage outlet; a cooling water tank with a return outlet; a heat exchanger with a steam inlet and a steam outlet; and a water storage tank with a water inlet and a water outlet. The sewage tank is connected to the sewage outlet via a sewage pipe; the sewage outlet is connected to the cooling water tank via a sewage pipe; the water in the sewage pipe passes through the cooling water tank and is discharged from the return port; the cooling water tank is connected to both the inlet and outlet of the water storage tank. The first steam outlet is connected to the steam inlet of the heat exchanger via a first steam pipe; the steam inlet is connected to the steam outlet; the heat exchanger is connected to both the water inlet and the water outlet of the water storage tank.
2. The waste heat recovery system according to claim 1, characterized in that, The cooling water tank has a second steam outlet; the sewage pipe is connected to the second steam outlet; the second steam outlet is connected to the first steam pipe through the second steam pipe.
3. The waste heat recovery system according to claim 1, characterized in that, The heat exchanger is also connected to a connecting pipe, which is also connected to the hot water pipe of the air conditioner.
4. The waste heat recovery system according to claim 3, characterized in that, Both ends of the connecting pipe are connected to the hot water pipe, and the two ends of the connecting pipe are spaced apart; a first valve body is provided on the connecting pipe, and a second valve body is provided on the hot water pipe located between the two ends of the connecting pipe.
5. The waste heat recovery system according to claim 4, characterized in that, The first steam pipe is connected to a pressure relief pipe, and the pressure relief pipe is equipped with a safety valve.
6. The waste heat recovery system according to claim 5, characterized in that, The first steam pipe is equipped with a pressure stabilizing valve, a regulating valve, and a check valve in sequence along the steam flow direction.
7. The waste heat recovery system according to claim 6, characterized in that, Temperature sensors and flow sensors are installed in the first steam pipe, the heat exchanger, the cooling water tank, the connecting pipe, and the hot water pipe.
8. The waste heat recovery system according to claim 7, characterized in that, It also includes a processor, and the first valve body, the second valve body, the safety valve, the regulating valve, the temperature sensor, and the flow sensor are all electrically connected to the processor.
9. The waste heat recovery system according to claim 1, characterized in that, The inlet and outlet of the water storage tank are connected through a first circulation pipe; the heat exchanger is connected to the first circulation pipe.
10. The waste heat recovery system according to claim 1, characterized in that, The inlet and outlet of the water storage tank are connected through a second circulation pipe; the cooling water tank is connected to the second circulation pipe.