A secondary heating system
By designing a secondary heating system, heat is utilized in stages and waste heat is recovered, solving the problem of low heat utilization in traditional heating systems and improving heating efficiency, system flexibility, and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- HEFEI RUINA ENERGY SAVING ENG CO LTD
- Filing Date
- 2025-07-14
- Publication Date
- 2026-07-31
AI Technical Summary
Traditional heating systems have low heat utilization rates, especially in extremely cold weather, making it difficult to guarantee heating needs.
Design a secondary heating system, including a heat pump and a heat exchanger. Through the parallel design of the first and second heating paths, heat can be used in stages. The heat energy utilization rate can be improved by utilizing the waste heat recovery end. The heating demand can be flexibly adjusted by controlling the electric valve and the circulating pump.
It improves thermal energy utilization, enhances heating effect, strengthens system flexibility and stability, reduces primary return water temperature, and improves overall unit heat exchange efficiency.
Smart Images
Figure CN224580337U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of heating technology, and in particular relates to a secondary heating system. Background Technology
[0002] In traditional heating systems, secondary circulating water pumps are typically installed at power plants. These pumps function as both power plant circulating water pumps and secondary heating network circulating water pumps. During the secondary water supply process, heat exchange units are usually used for heating. However, traditional heat exchange units have a small primary supply and return water temperature difference (around 45℃) and a high primary return water temperature (around 40℃), resulting in low heat utilization. Furthermore, in extremely cold weather, the limited heat source distribution capacity makes it difficult to guarantee the heating effect, leading to poor heating performance.
[0003] Therefore, it is urgent to design a secondary heating system to solve the problems mentioned above. Utility Model Content
[0004] One objective of this invention is to improve the utilization rate of thermal energy, enhance the heating effect, and increase the overall heat exchange efficiency of the unit by utilizing the waste heat recovery end.
[0005] Another objective of this invention is to achieve graded utilization of heat through the parallel design of the first and second heating channels, thereby improving the utilization rate of heat energy and flexibly supplementing heating demand.
[0006] To achieve the above objectives, the specific technical solution of the secondary heating system of this utility model is as follows: A secondary heating system includes a heat pump and a heat exchanger. The heat pump includes a first heating end, a second heating end, and a waste heat recovery end. The heat exchanger includes a first heat exchange end and a second heat exchange end. The secondary heating system further includes a first heating passage, in which the heated medium passes sequentially through the first heating end, the first heat exchange end, and the waste heat recovery end and is output. The secondary heating system further includes a second heating passage, in which the heated medium passes through the second heating end and / or the second heat exchange end and is output.
[0007] Furthermore, the secondary heating system also includes a first heating branch, one end of which is connected to the inlet end of the first heating passage, and the other end is connected to the first heat exchange end, so that the heated medium in the first heating passage directly enters the heat exchanger and is output.
[0008] Furthermore, the second heating passage includes a second heating branch and a third heating branch, the second heating branch and the third heating branch are connected in parallel, and both the second heating branch and the third heating branch are connected to the second heating end.
[0009] Furthermore, the second heating end includes an inlet end and two outlet ends. The second heating branch and the third heating branch both enter the heating pump through the inlet end and leave the heating pump through the two outlet ends respectively.
[0010] Furthermore, one of the second heating branch and the third heating branch connects to the second heat exchange end and outputs after leaving the heat pump, while the other outputs directly after leaving the heat pump.
[0011] Furthermore, the second heating path also includes a fourth heating branch, which is connected to the second heat exchange end and outputs heat.
[0012] Furthermore, an electric valve is installed between the fourth heating branch and the second and third heating branches.
[0013] Furthermore, the secondary heating system also includes a water replenishment unit, which is located at the inlet end of the second heating passage and is used to introduce softened water into the second heating passage when needed to maintain stable pressure in the second heating passage pipe.
[0014] Furthermore, the secondary heating system also includes a circulation pump, which is installed on the second heating passage and located at the outlet end of the water replenishment unit, and is used to adjust the circulation flow rate or inlet-outlet pressure difference of the second heating passage.
[0015] Furthermore, pressure transmitters and temperature sensors are installed at the inlet and outlet ends of both the first heating passage and the second heating passage. The pressure transmitters are used to monitor the inlet and outlet pressures of the first heating passage and the second heating passage, and the temperature sensors are used to monitor the inlet and outlet temperatures of the first heating passage and the second heating passage.
[0016] The secondary heating system of this invention has the following advantages: 1. This secondary heating system achieves graded utilization of heat through the parallel design of the first heating path and the second heating path. The first heating path improves the heat energy utilization rate through the waste heat recovery end, and the second heating path flexibly supplements the heating demand.
[0017] 2. The heat exchanger and the heat pump have clearly defined functions, with the heat exchange end and the heating end corresponding to different paths, which facilitates system expansion and maintenance. In the first heating path, the heated medium is output after passing through the waste heat recovery end, which reduces the primary return water temperature and improves the utilization rate of the heat source temperature difference. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the secondary heating system of this utility model; Figure 2 This is a schematic diagram of the structure when the first heating branch of this utility model is connected; Figure 3 This is a schematic diagram of the structure when the second and third heating branches of this utility model are connected; Figure 4 This is a schematic diagram of the structure when the second heating branch of this utility model is connected; Figure 5 This is a schematic diagram of the structure when the third heating branch of this utility model is connected; Figure 6 This is a schematic diagram of the structure when the fourth heating branch of this utility model is connected; Figure 7 This is a schematic diagram of the secondary heating system of this utility model when using a heat exchanger for heating; Figure 8 This is a schematic diagram of the waste heat recovery structure of the secondary heating system of this utility model.
[0019] Explanation of markings in the diagram: 1. Heat pump; 11. First heating end; 12. Second heating end; 13. Waste heat recovery end; 2. Heat exchanger; 21. First heat exchange end; 22. Second heat exchange end; 301. Electric valve one; 302. Electric valve two; 303. Electric valve three; 304. Electric valve four; 305. Electric valve five; 306. Electric valve six; 307. Electric valve seven; 308. Electric valve eight; 309. Electric valve nine; 310. Electric valve ten; 4. Water supply unit; 5. Circulation pump; 6. Pressure transmitter; 7. Temperature sensor. Detailed Implementation
[0020] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0021] Those skilled in the art will understand that although some embodiments herein include certain features included in other embodiments but not others, combinations of features from different embodiments are intended to be within the scope of this invention and form different embodiments. For example, in the claims, any of the claimed embodiments can be used in any combination.
[0022] The following is a reference to the appendix. Figure 1 To be continued Figure 8 This invention describes a secondary heating system.
[0023] This embodiment provides a secondary heating system. Figure 1 This is a schematic diagram of the secondary heating system in this embodiment, as shown below. Figure 1 As shown, the secondary heating system includes a heat pump 1 and a heat exchanger 2. The heat pump 1 includes a first heating end 11, a second heating end 12, and a waste heat recovery end 13. The heat exchanger 2 includes a first heat exchange end 21 and a second heat exchange end 22. The secondary heating system also includes a first heating passage, in which the heated medium passes through the first heating end 11, the first heat exchange end 21, and the waste heat recovery end 13 in sequence and is output. The secondary heating system also includes a second heating passage, in which the heated medium passes through the second heating end 12 and / or the second heat exchange end 22 and is output.
[0024] The secondary heating system has the following advantages: 1. The secondary heating system achieves graded utilization of heat through the parallel design of the first heating path and the second heating path. The first heating path improves the heat energy utilization rate through the waste heat recovery end 13, and the second heating path flexibly supplements the heating demand; 2. The ends of the heat exchanger 2 and the heat pump 1 have clear division of labor, that is, the heat exchange end and the heating end correspond to different paths, which facilitates system expansion and maintenance. In the first heating path, the heated medium is output after passing through the waste heat recovery end 13, which reduces the primary return water temperature and improves the utilization rate of the heat source temperature difference.
[0025] In some embodiments, the first heating path is the primary side, typically connected to a thermal power plant, with the inlet end being the primary water supply and the outlet end being the primary return water; the second heating path is the secondary side, typically connected to the residential heating end, with the inlet end being the secondary return water and the outlet end being the secondary water supply. That is to say, the water supply is relative to the heating end. For the primary side, the thermal power plant is the heating end, so the primary network supplies water to the thermal power plant, and the water enters the thermal power plant; for the secondary side, the residential heating end is the heating end, so the thermal power plant supplies water to the residential residents, and the water flows from the thermal power plant to the residential residents.
[0026] Specifically, such as Figure 1 As shown, the secondary heating system includes electric valve 1 301, electric valve 2 302, electric valve 3 303, electric valve 4 304, electric valve 5 305, electric valve 6 306, electric valve 7 307, electric valve 8 308, electric valve 9 309 and electric valve 10 310, which realize the control of the first heating passage and the second heating passage.
[0027] Furthermore, Figure 2 This is a schematic diagram of the structure when the first heating branch is connected in this embodiment, as shown below. Figure 1 and Figure 2As shown, the secondary heating system also includes a first heating branch. One end of the first heating branch is connected to the inlet of the first heating passage, and the other end is connected to the first heat exchange end 21, so that the heated medium in the first heating passage directly enters the heat exchanger 2 and is output. The heated medium enters the heat exchanger 2 directly through the first heating branch, avoiding the pumping energy consumption when flowing through the first heating end 11 and reducing ineffective circulation. Under partial load conditions, this branch can be prioritized for rapid heating, improving the system's adjustment flexibility.
[0028] Understandably, the secondary heating system can sequentially open electric valve 301 and electric valve 306 (while other electric valves are closed, the same below) to connect the first heating branch.
[0029] Specifically, the second heating passage includes a second heating branch and a third heating branch. The second heating branch and the third heating branch are connected in parallel, and both the second heating branch and the third heating branch are connected to the second heating end 12.
[0030] Specifically, the second heating end 12 includes an inlet end and two outlet ends. The second heating branch and the third heating branch both enter the heating pump 1 through the inlet end and leave the heating pump 1 through the two outlet ends respectively.
[0031] Understandable Figure 3 This is a schematic diagram of the structure when the second and third heating branches of this embodiment are connected, as shown below. Figure 1 and Figure 3 As shown, the secondary heating system can sequentially open electric valve 8 308, electric valve 9 309 and electric valve 10 310 to connect the second heating branch with the third heating branch.
[0032] Furthermore, one of the second heating branch and the third heating branch connects to the second heat exchange end 22 and outputs after leaving the heat pump 1, while the other outputs directly after leaving the heat pump 1.
[0033] It is understandable that the second heating branch outputs directly after leaving the heating pump 1, and the third heating branch connects to the second heat exchange end 22 and outputs after leaving the heating pump 1.
[0034] Specifically, Figure 4 This is a schematic diagram of the structure when the second heating branch is connected in this embodiment, as shown below. Figure 1 and Figure 4 As shown, the secondary heating system can sequentially open electric valve 309 and electric valve 310 to connect the second heating branch.
[0035] Specifically, Figure 5 This is a schematic diagram of the structure when the third heating branch is connected in this embodiment, as shown below. Figure 1 and Figure 5As shown, the secondary heating system can sequentially open electric valve 308 and electric valve 310 to connect the third heating branch.
[0036] It should be noted that in practical applications, the second and third heating branches usually work simultaneously. This is because the heated medium mainly flows through the third heating branch. Since the flow rate of the second heating branch is very small, the third heating branch must also be opened when the second heating branch is opened, and vice versa.
[0037] Furthermore, the second heating path also includes a fourth heating branch, which connects to and outputs from the second heat exchange end 22. The fourth heating branch switches with the main branch via an electric valve to adapt to different temperature requirements. The valve prevents the heated medium from flowing back into the inactive branch from the second heat exchange end 22, ensuring system stability.
[0038] Furthermore, an electric valve is installed between the fourth heating branch and the second and third heating branches. Specifically, Figure 6 This is a schematic diagram of the structure when the fourth heating branch is connected in this embodiment. (See attached diagram.) Figure 1 and Figure 6 The fourth heating branch can open the electric valve 7307 to connect the fourth heating branch.
[0039] Furthermore, such as Figure 1 As shown, the secondary heating system also includes a water replenishment unit 4, which is located at the inlet end of the second heating passage. This unit is used to introduce softened water into the second heating passage when needed, maintaining stable pressure within the pipes. The softened water replenishment prevents system depressurization, thus avoiding the impact of pipe depressurization on high-rise users, such as gas accumulation and system shutdown. Simultaneously, the softened water also prevents scaling in the second heating passage, extending equipment lifespan. The water replenishment unit 4 is directly connected to the inlet end, allowing for rapid replenishment of water lost due to leaks, preventing gas accumulation on high-rise users due to pipe depressurization, and even severe depressurization leading to system shutdown.
[0040] Furthermore, such as Figure 1 As shown, the secondary heating system also includes a circulation pump 5, which is installed on the second heating passage and located at the outlet end of the water replenishment unit 4. The circulation pump 5 is used to regulate the circulation flow rate or the inlet-outlet pressure difference of the second heating passage. After water replenishment, the circulation pump 5 automatically adjusts the pressure, thereby promoting water circulation and enabling the overall system to regulate flow rate or pressure difference.
[0041] Furthermore, such as Figure 1As shown, pressure transmitters 6 and temperature sensors 7 are installed at the inlet and outlet ends of both the first and second heating passages. Pressure transmitters 6 monitor the inlet and outlet pressures of the first and second heating passages, while temperature sensors 7 monitor the inlet and outlet temperatures of the first and second heating passages. The inlet / outlet pressure transmitters 6 and temperature sensors 7 form a closed-loop monitoring system, promptly detecting blockages or leaks (such as abnormal pressure) or decreased heat exchange efficiency (such as abnormal temperature differences). The monitoring data provides a basis for system adjustments (such as valve opening and pump speed), improving overall energy efficiency.
[0042] The secondary heating system can be used in the following ways: When the temperature is high Figure 7 This is a schematic diagram of the secondary heating system in this embodiment when using a heat exchanger for heating, as shown below. Figure 1 and 7 As shown, the primary flow requirement of the heat source is small, and heat exchanger 2 alone is sufficient for heating. At this time, heat pump 1 is not running; only electric valves 301, 306, and 307 are open. The heated medium in the first heating path enters the first heating end 11 of heat exchanger 2 via electric valve 301. After heat exchange, it flows out from the primary outlet and through electric valve 306, thus entering the first heating path. The secondary return water in the second heating path is pushed by circulation pump 5 through electric valve 307 into the secondary inlet of heat exchanger 2. After heat exchange, it flows out from the secondary outlet back into the second heating path.
[0043] In extremely cold weather, Figure 8 This is a schematic diagram of the waste heat recovery structure of the secondary heating system in this embodiment, as shown below. Figure 1 and 8 As shown, when the heat pump 1 is turned on, it enters the waste heat recovery mode. In this mode, for the primary side, electric valves 2 (302), 3 (303), 5 (305), and 4 (304) are opened; for the secondary side, electric valves 8 (308), 9 (309), and 10 (310) are opened. The heated medium in the first heating path enters the primary inlet of the heat pump 1 through electric valve 2 (302), driving the heat pump 1 and releasing some energy to the secondary side. Water flows out from the primary outlet of the heat pump 1 and flows into the heat exchanger through electric valve 3 (303). After heat exchange with the secondary side inside the heat exchanger 2, the water flows out from the primary outlet of the heat exchanger 2 (temperature approximately 40°C). The water flowing out from the primary outlet of the heat exchanger 2 enters the waste heat inlet pipeline of the heat pump 1 through electric valve 5 305 for waste heat recovery and utilization. Then, it returns from the waste heat outlet of the heat pump 1 through electric valve 4 304 to the first heating passage (temperature approximately 30°C). In this way, the temperature of the primary return water of the heat exchanger 2 is reduced from 40°C to 30°C, and the temperature difference is increased by 10°C, which is equivalent to an overall heat exchange efficiency improvement of 20%.
[0044] The secondary return water is pushed by the circulating pump 5 and flows into the secondary inlet of the heating pump 1 through the electric valve 310. The water flow in the heating pump 1 is divided into two directions: one is that after absorbing the energy released when the primary water supply drives the heating pump 1, it flows out from the secondary outlet of the heating pump 1 to the second heating passage; the other is that after absorbing the recovered waste heat in the primary return water, it flows out from the secondary outlet of the heating pump 1, and then flows into the secondary inlet of the heat exchanger 2 to further exchange heat with the primary side, and finally flows out from the secondary outlet of the heat exchanger 2 to the second heating passage.
[0045] It is understandable that the above-mentioned electric valves 301 to 310 all have remote control functions. When selecting the waste heat recovery mode or the heat exchanger 2-only operation mode, one-click selection and switching can be achieved through the unattended system.
[0046] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.
Claims
1. A secondary heating system comprising a heat pump and a heat exchanger, characterized in that, The heat pump includes a first heating end, a second heating end and a waste heat recovery end, and the heat exchanger includes a first heat exchange end and a second heat exchange end; The secondary heating system further includes a first heating passage, in which the heated medium passes sequentially through the first heating end, the first heat exchange end, and the waste heat recovery end and is output. The secondary heating system further includes a second heating passage, in which the heated medium passes through the second heating end and / or the second heat exchange end and is output.
2. The secondary heating system of claim 1, wherein, The secondary heating system further includes a first heating branch, one end of which is connected to the inlet end of the first heating passage, and the other end is connected to the first heat exchange end, so that the heated medium in the first heating passage directly enters the heat exchanger and is output.
3. The secondary heating system of claim 1, wherein, The second heating path includes a second heating branch and a third heating branch. The second heating branch and the third heating branch are connected in parallel, and both the second heating branch and the third heating branch are connected to the second heating end.
4. The secondary heating system of claim 3, wherein, The second heating end includes an inlet end and two outlet ends. The second heating branch and the third heating branch both enter the heating pump through the inlet end and leave the heating pump through the two outlet ends respectively.
5. The secondary heating system of claim 4, wherein, One of the second heating branch and the third heating branch connects to the second heat exchange end and outputs after leaving the heat pump, while the other outputs directly after leaving the heat pump.
6. The secondary heating system of claim 3, wherein, The second heating path also includes a fourth heating branch, which is connected to the second heat exchange end and outputs heat.
7. The secondary heating system of claim 6, wherein, An electric valve is installed between the fourth heating branch and the second and third heating branches.
8. The secondary heating system according to any one of claims 1-7, characterized in that, The secondary heating system also includes a water replenishment unit, which is located at the inlet end of the second heating passage and is used to introduce softened water into the second heating passage when needed to maintain stable pressure in the second heating passage pipe.
9. The secondary heating system of claim 8, wherein, The secondary heating system also includes a circulation pump, which is installed on the second heating passage and located at the outlet end of the water replenishment unit, and is used to adjust the circulation flow rate or inlet-outlet pressure difference of the second heating passage.
10. A secondary heating system according to any one of claims 1 to 7, characterised in that, Pressure transmitters and temperature sensors are installed at the inlet and outlet ends of both the first and second heating passages. The pressure transmitters are used to monitor the inlet and outlet pressures of the first and second heating passages, and the temperature sensors are used to monitor the inlet and outlet temperatures of the first and second heating passages.