Partition type heat storage water tank and heat supply system and method applying heat storage water tank

Abstract

The invention relates to the field of heat supply, and discloses a partitioned heat storage water tank and a heat supply system and method.The partitioned heat storage water tank comprises a tank body, a first partition plate and a second partition plate are fixedly arranged in the tank body, the first partition plate divides the inner space of the tank body into a first area and a second area which are not communicated, and the second partition plate is fixedly arranged in the tank body; the second partition plate divides the second area into a water inlet area and a water storage area, a working medium in the water inlet area can overflow to the water storage area from the top of the second partition plate, a first notch used for communicating the water inlet area with the water storage area is formed in the bottom of the second partition plate, and a first inlet, a second inlet, a first outlet and a second outlet are formed in the box body; compared with an existing heat storage water tank which only adopts two partition plates for partition layout, the heat storage water tank has the advantages that the use of the partition plates is reduced, the overall mass of the tank body is reduced, the application range of water tank installation is widened, and the manufacturing cost is reduced.

Description

Technical Field

[0001] The present invention relates to the field of heating, and in particular to a partitioned hot water storage tank, and a heating system and method using the hot water storage tank. Background Art

[0002] In industrial production, the operation of numerous production facilities is highly dependent on various heat-consuming equipment to meet their process requirements. To provide a stable heat supply to these facilities, the currently common heating method is to store hot water in a water storage tank and then transport it to the various heat-consuming equipment, providing the required heat through heat exchange.

[0003] Existing hot water storage tank technology has some problems that need to be solved urgently. Currently common types of hot water storage tanks include labyrinth-type hot water storage tanks, multi-tank hot water storage tanks, and modular hot water storage tanks. These hot water storage tanks usually form a labyrinth-type, multi-tank-type, or modular internal structure by setting a number of partitions inside the tank body to achieve heat storage and distribution. However, this design has obvious defects: on the one hand, the use of a large number of partitions leads to a significant increase in the overall mass of the hot water storage tank, which not only limits the installation environment of the hot water storage tank, making it difficult to adapt to some places with limited space, but also increases the difficulty of installation and transportation. On the other hand, the extensive use of partitions also greatly increases the manufacturing cost of the hot water storage tank, bringing unnecessary economic burdens to industrial production. Summary of the Invention

[0004] The purpose of the present invention is to overcome the problem of limited installation environment of existing hot water storage tanks and provide a partitioned hot water storage tank, which can reduce the overall weight of the tank body, is suitable for a wider installation environment, and has a lower manufacturing cost.

[0005] To achieve the above objectives, the present invention provides, in a first aspect, a partitioned hot water storage tank, comprising a tank body, wherein a first partition and a second partition are fixedly disposed within the tank body, wherein the first partition divides the interior space of the tank body into a first area and a second area that are not connected to each other, and the second partition divides the second area into a water inlet area and a water storage area, wherein the working medium in the water inlet area can overflow from the top of the second partition into the water storage area, and a first notch is formed at the bottom of the second partition for connecting the water inlet area and the water storage area; The box body is provided with a first inlet, a second inlet, a first outlet and a second outlet. The first inlet and the first outlet are both connected to the first area, the second inlet is connected to the water inlet area, and the second outlet is connected to the water storage area.

[0006] In some embodiments, a second notch is formed on the top of the first partition plate to connect the first area and the water inlet area, and the working medium in the first area can overflow from the second notch to the water inlet area. An overflow port is formed on the box body and the overflow port is connected to the first area. The height of the overflow port is higher than that of the second notch, and the height of the top of the second partition is lower than that of the second notch.

[0007] In some embodiments, a spoiler is fixedly provided in the water storage area for disturbing the working medium flowing out of the first gap, and a gap is provided between the spoiler and the bottom wall inside the box.

[0008] In some embodiments, guide plates are provided in the first area and / or the second area.

[0009] In some embodiments, a phase change material for heat storage is provided in the water storage area, and the phase change temperature of the phase change material is not lower than the heating temperature.

[0010] A second aspect of the present invention provides a heating system using the above-described partitioned hot water storage tank, the heating system further comprising: a heat pump unit, wherein the liquid inlet of the heat pump unit is connected to the first outlet, and the liquid outlet of the heat pump unit is connected to the second inlet; a heat supply pump station, wherein the liquid inlet of the heat supply pump station is connected to the second outlet; a main pipeline, one end of which is connected to the liquid outlet of the heat supply pump station, and the other end of which is connected to the first inlet; a first stop valve, a second stop valve, and a one-way valve are sequentially provided on the main pipeline along the flow direction of the working medium; the working medium in the main pipeline between the first stop valve and the second stop valve is used to supply heat to the heat-consuming equipment; a branch pipeline, the branch pipeline being in communication with the main pipeline, one end of the branch pipeline being in communication with the upstream of the first stop valve, and the other end of the branch pipeline being in communication with between the second stop valve and the one-way valve; A control valve is used to adjust the flow rate of the working medium flowing from the main pipeline to the branch pipeline.

[0011] In some embodiments, the heat pump units are provided in plurality and connected in parallel between the first outlet and the second inlet; Preferably, the heating system further comprises a photothermal system for heating the working medium, and the photothermal system and the heat pump unit are connected in parallel between the first outlet and the second inlet.

[0012] A third aspect of the present invention provides a heating method using the heating system described above, comprising the following steps: Keep the first stop valve, the second stop valve, and the heat supply pumping station in the open state; The heat supply pumping station extracts the working medium in the second area at the second outlet and pumps the working medium into the main pipeline. Part of the working medium flows through the first stop valve, the second stop valve, and the check valve in sequence in the main pipeline and returns to the first area from the first inlet. Another part of the working medium flows through the control valve and the branch pipeline and returns to the main pipeline; Based on the heat demand, adjust the flow rates of the working medium in the main pipeline and the branch pipeline through the control valve; Start the heat pump unit. The heat pump unit extracts the working medium in the first area at the first outlet and heats it. The heated working medium flows into the second area at the second inlet.

[0013] In some embodiments, obtain the liquid level H in the first area; If: H ≤ H1, then the heat pump unit stops running, keep the heat supply pumping station running, and replenish the working medium into the box body; If: H1 < H < H2 and the liquid level H is in a continuous decreasing state, reduce the flow rate of the working medium extracted by the heat pump unit in the first area; If: H ≥ H3 and the liquid level H is in a continuous increasing state, increase the flow rate of the working medium extracted by the heat pump unit in the first area; Where, H1 is the protection liquid level, H2 is the lower limit liquid level, and H3 is the upper limit liquid level; Preferably, when there are several heat pump units, the flow rate of the working medium extracted by the heat pump unit in the first area can be increased by increasing the number of operating heat pump units; When there are several heat pump units and the number of operating units is at least two, the working medium extracted by the heat pump unit in the first area can be reduced by reducing the number of operating heat pump units.

[0014] In some embodiments, obtain the electricity price at the current time period; If the electricity price at the current time period is at the low valley electricity, then maintain the temperature of the working medium flowing out of the second outlet at a state not lower than T1, otherwise maintain the temperature of the working medium flowing out of the second outlet at a state not lower than T2; Where, T1 > T2, T1 is the heat storage temperature, and T2 is the heat supply temperature; Preferably, when there is a phase change material configured in the water storage area, set the threshold temperature T3, where: the phase change temperature of the phase change material is lower than T1, and T1 > T3 > T2; If the electricity price at the current time period is not at the low valley electricity and the temperature of the working medium flowing out of the second outlet is lower than T3, start the heat pump unit and maintain the temperature of the working medium flowing out of the second outlet at a state not lower than T2.

[0015] The application of the above technical solution of the present invention to a partitioned hot water storage tank has the following effects: Compared to existing hot water storage tanks, the zoned hot water storage tank uses only two partitions for partitioning. This reduces the number of partitions, lowers the overall tank mass, expands the tank's installation range, and reduces manufacturing costs. The zoned hot water storage tank uses an internal overflow system to transfer the high-temperature working medium. The notch at the bottom of the second partition ensures more even distribution of the high-temperature working medium, improving the stability of heat output.

[0016] Other features and advantages of the present invention will be described in detail in the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the three-dimensional structure of a partitioned hot water storage tank according to an embodiment of the present invention; Figure 2 It is a three-dimensional cross-sectional schematic diagram of a partitioned hot water storage tank according to an embodiment of the present invention; Figure 3 is a side cross-sectional schematic diagram of a partitioned hot water storage tank according to an embodiment of the present invention; Figure 4 1 is a schematic top view and cross-section of a partitioned hot water storage tank according to an embodiment of the present invention; Figure 5 is a schematic diagram of a heating system according to a first embodiment of the present invention; Figure 6 is a schematic diagram of a heating system according to a second embodiment of the present invention; Figure 7 It is a schematic diagram of a heating system according to a third embodiment of the present invention.

[0018] Description of Reference Numerals 1. Box body; 2. First partition; 3. First area; 4. Second area; 5. First inlet; 6. Second inlet; 7. First outlet; 8. Second outlet; 9. Second gap; 10. Overflow port; 11. Second partition; 12. Water inlet area; 13. Water storage area; 14. First gap; 15. Spoiler; 16. Guide plate; 17. Water supply port; 18. Heat pump unit; 19. Heating pump station; 20. Main pipeline; 21. First stop valve; 22. Second stop valve; 23. One-way valve; 24. Branch pipeline; 25. Control valve; 26. Solar thermal system. DETAILED DESCRIPTION

[0019] The following is a detailed description of the specific embodiments of the present invention. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0020] In the first aspect of the present invention, a partitioned hot water storage tank is provided. Figure 1 and attached Figure 2 As shown, the partitioned hot water storage tank includes a tank body 1, in which a first partition 2 and a second partition 11 are fixed. The first partition 2 divides the internal space of the tank body 1 into a first area 3 and a second area 4 that are not connected to each other, and the second partition 11 divides the second area 4 into a water inlet area 12 and a water storage area 13. The working medium in the water inlet area 12 can overflow from the top of the second partition 11 to the water storage area 13. The bottom of the second partition 11 is provided with a second notch 9 for connecting the water inlet area 12 and the water storage area 13. Figure 3 and attached Figure 4 As shown, the box body 1 is provided with a first inlet 5, a second inlet 6, a first outlet 7 and a second outlet 8. The first inlet 5 and the first outlet 7 are both connected to the first area 3, the second inlet 6 is connected to the water inlet area 12 and the second outlet 8 is connected to the water storage area 13.

[0021] The main body of the enclosure 1 is constructed from polyurethane insulation to ensure excellent thermal insulation. Specifically, the enclosure 1 utilizes a double-layer stainless steel shell with an inner and outer layer, and utilizes a polyurethane in-situ foaming process to ensure thermal insulation and minimize thermal bridging. Thermal bridging refers to uneven heat transfer due to varying thermal conductivity of materials. Similarly, the insulation measures for the first and second partitions 2, 11 are identical to those for the main body of the enclosure 1.

[0022] The working medium's circulation process is as follows: First, the working medium in the first region 3 is discharged through the first outlet 7, flows through an external pipeline, and then flows into the water inlet region 12 through the second inlet 6. Second, under the action of hydraulic pressure, the working medium in the water inlet region 12 is discharged from the first notch 14 to the water storage region 13. When the flow rate of working medium flowing into the second inlet 6 exceeds the flow rate of working medium discharged from the first notch 14, the liquid level in the water inlet region 12 rises. When the liquid level in the water inlet region 12 rises above the height of the top of the second partition 11, the working medium in the water inlet region 12 overflows into the water storage region 13. This overflow transfer, combined with the notch at the bottom of the second partition 11, ensures a more even distribution of the working medium in the water storage region 13. The working medium in the water storage region 13 is then discharged from the second outlet 8 to supply heat to the heating equipment. Finally, the heated working medium flows back into the first region 3 through the first inlet 5, completing the circulation.

[0023] Since the working medium needs to be heated externally after being discharged from the second outlet 8, the temperature of the working medium flowing into the first region 3 after being heated is lower than that of the working medium discharged from the second outlet 8. To ensure that the temperature of the working medium can meet the heating requirements of the heat-consuming equipment, the working medium can be heated by an external heating device during the process of being discharged from the first outlet 7 to the external pipeline and then flowing into the second inlet 6, so that the temperature of the working medium flowing into the second inlet 6 meets the requirements of the heat-consuming equipment.

[0024] In this embodiment, the first notches 14 are formed as a plurality of through-holes formed at the bottom of the second partition 11. The first notches 14 are designed to allow the working medium in the water inlet area 12 to be discharged and transferred to the water storage area 13 through the first notches 14 under hydraulic pressure during operation, thereby preventing the working medium from forming a dead zone within the water inlet area 12. If the working medium in the water inlet area 12 were to be transferred to the water storage area 13 solely by overflow, the working medium at the bottom of the water inlet area 12 would have poor fluidity and could easily form dead water, shortening the service life of the hot water tank. Furthermore, the first notches 14 allow the working medium in the water inlet area 12 to be fully discharged to the water storage area 13 during maintenance. Specifically, during maintenance, the working medium within the tank body 1 must be fully discharged. The working medium in the water inlet area 12 can be discharged through two methods: overflow into the water storage area 13 and discharge into the water storage area 13 through the first notches 14. Relying solely on overflow, the working medium in the water inlet area 12 cannot be fully discharged.

[0025] In addition, as attached Figure 1 As shown, a water replenishment port 17 is provided in the housing 1, located above the water storage area 13. If a leak occurs within the housing 1, the total volume of the working medium within the housing 1 decreases. This port allows the working medium to be replenished until the effective liquid level is reached. Typically, the effective liquid level within the housing 1 is flush with the height of the second partition 11. The location of the water replenishment port 17 above the water storage area 13 allows the replenished working medium to flow quickly, driven by the heat pump station 19, to replenish the first area 3.

[0026] In some preferred embodiments, Figure 2 and attached Figure 3 As shown, a second notch 9 is provided at the top of the first partition 2 for connecting the first area 3 and the water inlet area 12. The working medium in the first area 3 can overflow from the second notch 9 to the water inlet area 12. An overflow port 10 is provided on the box body 1 and is connected to the first area 3. The height of the overflow port 10 is higher than that of the second notch 9, and the top height of the second partition 11 is lower than that of the second notch 9.

[0027] When the demand for heat equipment is large, the flow rate of the working medium discharged from the second outlet 8 will increase, and thus the flow rate of the working medium discharged from the first inlet 5 will also increase. At this time, if the flow rate of the working medium discharged from the first inlet 5 is greater than the flow rate of the working medium discharged from the first outlet 7, the working medium level in the first area 3 will rise. When the working medium level in the first area 3 rises to the overflow port 10, the working medium will overflow and be discharged from the overflow port 10. It should be noted that the core function of the overflow port 10 is to prevent excessive accumulation of liquid or excessive pressure, and to provide a safety guarantee. Specifically, when the liquid levels in the first area 3 and the second area 4 inside the box body 1 both reach the overflow port 10, it indicates that the pressure inside the box body 1 is too high. At this time, the working medium can be discharged through the overflow port 10 to ensure safety.

[0028] During the above process, although the working medium accumulates in the first region 3, the working medium capacity in the second region 4 is relatively small, and the working medium capacity within the entire tank 1 remains within the normal range. If some of the working medium in the first region 3 overflows and is discharged from the overflow port 10, it will cause waste of working medium in the hot water tank and loss of stored heat.

[0029] The second notch 9 is designed to allow the working medium in the first region 3 to overflow into the water inlet area 12 in the second region 4 before reaching the overflow port 10 when the working medium level in the first region 3 is high and the level in the second region 4 is low, thus avoiding waste of working medium and heat loss. Furthermore, the height of the second baffle 11 is required to be lower than that of the second notch 9. This ensures that when the working medium level in the water inlet area 12 is higher than the top of the second baffle 11, the working medium in the water inlet area 12 overflows only into the water storage area 13 and not into the first region 3.

[0030] In some preferred embodiments, Figure 2 and attached Figure 3 As shown, a spoiler 15 is fixedly installed in the water storage area 13 to disrupt the flow of the working medium flowing out of the first notch 14. A gap is formed between the spoiler 15 and the bottom wall of the housing 1. Specifically, the spoiler 15 is made of stainless steel and disrupts the flow of the working medium discharged from the water inlet area 12 through the first notch 14 into the water storage area 13, thereby improving the temperature distribution of the working medium in the water storage area 13.

[0031] In some preferred embodiments, Figure 4As shown, a guide plate 16 is provided in the first area 3 and / or the second area 4. The guiding effect of the guide plate 16 can guide the flow direction of the working medium to further prevent the working medium from forming a dead water zone in the first area 3 and the second area 4. Specifically, when the space of the first area 3 is large, the time for the working medium to flow from the first inlet 5 to the first outlet 7 is long, and the flow rate is slow in the middle period of the flow, which easily forms a dead water zone. The setting of the guide plate 16 is to guide the flow process of the working medium in the entire first area 3 to prevent the working medium from forming a dead water zone in the first area 3. Similarly, if the space of the second area 4 is large, the time for the working medium to flow to the second outlet 8 is long, and the flow rate is slow in the middle period of the flow, which also easily forms a dead water zone. In this embodiment, guide plates 16 are provided in the water storage area 13 of the first area 3 and the second area 4 to prevent the working medium from forming a dead water zone therein.

[0032] In some preferred embodiments, a phase-change material for heat storage is provided in the water storage area 13. The phase-change temperature of the phase-change material is not lower than the heating temperature. When the working medium's temperature exceeds the phase-change temperature of the phase-change material during the working cycle, the phase-change material absorbs the working medium's heat and stores it. When the working medium's temperature falls below the phase-change temperature, the phase-change material provides heat to the working medium. The presence of the phase-change material can enhance the heat storage capacity of the water storage tank.

[0033] The second aspect of the present invention provides a heating system, which uses the partitioned hot water storage tank of any of the above embodiments. Figure 5 and attached Figure 6As shown, the heating system also includes a heat pump unit 18, a heat pump station 19, a main pipeline 20, a branch pipeline 24, a first shut-off valve 21, a second shut-off valve 22, a one-way valve 23, and a control valve 25. The liquid inlet of the heat pump unit 18 is connected to the first outlet 7, and the liquid outlet of the heat pump unit 18 is connected to the second inlet 6. The working medium in the first region 3 is discharged from the first outlet 7, heated by the heat pump unit 18, and then flows into the water inlet area 12 through the second inlet 6. The liquid inlet of the heat pump station 19 is connected to the second outlet 8. The heat pump station 19 pumps the working medium from the water storage area 13 to supply heat to the heat-consuming equipment. The heat pump station 19 uses a variable frequency pump to adjust the power of the heat pump station 19 based on heat demand, thereby adjusting the output flow rate of the working medium at the second outlet 8 and maintaining a stable pressure at the second outlet 8. One end of the main pipeline 20 is connected to the liquid outlet of the heat pump station 19, and the other end is connected to the first inlet 5. A first stop valve 21, a second stop valve 22, and a one-way valve 23 are sequentially arranged on the main pipeline 20 along the direction of the working medium flow. The working medium in the main pipeline 20 between the first stop valve 21 and the second stop valve 22 is used to supply heat to the heat-consuming equipment. The first stop valve 21 and the second stop valve 22 are normally open and are only closed during maintenance. The one-way valve 23 prevents the working medium in the first area 3 from flowing back into the main pipeline 20. A branch pipeline 24 is connected to the main pipeline 20. One end of the branch pipeline 24 is connected upstream of the first stop valve 21, and the other end is connected between the second stop valve 22 and the one-way valve 23. A control valve 25 is used to regulate the flow rate of the working medium flowing from the main pipeline 20 to the branch pipeline 24. Generally, softened water is used as the working medium. To prevent scaling in the pipelines from affecting the heat exchange efficiency of the energy-consuming equipment, softened water is selected as the working fluid to reduce maintenance costs.

[0034] In some embodiments, as shown in the attached Figure 5As shown, the first and second stop valves 21 and 22 are normally open, while the control valve 25 is an on-off valve installed on the branch pipe 24. This design of the heating system is suitable for uninterrupted heat production environments. Specifically, the heating pump station 19 operates and extracts working medium from the water storage area 13. When the on-off valve is closed, all the working medium pumped out of the liquid outlet of the heating pump station 19 flows into the main pipe 20 and is used for heating. When the on-off valve is open, part of the working medium pumped out of the liquid outlet of the heating pump station 19 flows into the main pipe 20 for heating, while the remaining part flows through the branch pipe 24 and mixes with the heated working medium in the main pipe 20 between the second stop valve 22 and the one-way valve 23. The flow rate of the working medium in the branch pipe 24 is adjusted by adjusting the opening of the on-off valve. When the heat demand decreases, the on-off valve opening is increased, thereby increasing the flow rate of the working medium in the branch pipe 24 and reducing the flow rate of the working medium in the main pipe 20 for heating. Conversely, decreasing the opening of the on-off valve reduces the flow rate of the working medium in branch pipe 24, increasing the flow rate of the working medium used for heating in main pipe 20. Furthermore, when the on-off valve is fully closed, the flow rate of the working medium used for heating in main pipe 20 is at its maximum. To further increase the flow rate of the working medium used for heating in main pipe 20, the output power of heat pump station 19 must be adjusted. In summary, regardless of whether control valve 25 is open or closed, or how much it is open, a certain flow rate of working medium is always available in main pipe 20 for heating, ensuring uninterrupted production heat demand.

[0035] In other embodiments, as shown in the attached Figure 6As shown, the first stop valve 21 and the second stop valve 22 are in a normally open state, and the control valve 25 is connected between the main pipeline 20 and the branch pipeline 24 using a three-way reversing valve and is located upstream of the first stop valve 21. The heating system designed in this way is suitable for production environments with intermittent heat demand. Specifically, the heating pump station 19 operates and extracts the working medium from the water storage area 13. When the three-way reversing valve is only connected to one side of the first stop valve 21, the working medium pumped out of the liquid outlet of the heating pump station 19 all flows to the main pipeline 20 and is used for heating; when the three-way reversing valve is only connected to one side of the branch pipeline 24, the working medium pumped out of the liquid outlet of the heating pump station 19 all flows to the branch pipeline 24, and no working medium flows in the main pipeline 20 for heating. By adjusting the opening of the three-way reversing valve connected to the first stop valve 21 side and the branch pipeline 24 side, the flow rate of the working medium used for heating and the flow rate of the working medium flowing in the branch pipeline 24 are adjusted. Similarly, when the three-way reversing valve is connected to only one side of the first stop valve 21, the flow rate of the working medium for heating in the main pipeline 20 is the largest. At this time, if the flow rate of the working medium for heating in the main pipeline 20 needs to be further increased, it is necessary to adjust the output power of the heat supply pump station 19. In summary, the configuration of the three-way reversing valve can meet the needs of production with intermittent heating demand, and of course, it can also meet the needs of production with uninterrupted heating demand.

[0036] In some preferred embodiments, Figure 7 As shown, several heat pump units 18 are provided and connected in parallel between the first outlet 7 and the second inlet 6. The heat pump units 18 can operate in a constant flow rate mode. This means that the power of a single heat pump unit 18 extracting the working medium from the first region 3 remains constant. The greater the number of heat pump units 18 in operation, the greater the flow rate of the working medium discharged from the first outlet 7. When the liquid level in the first region 3 is high and continues to rise, the number of heat pump units 18 in operation can be increased; when the liquid level in the first region 3 is low and continues to fall, the number of heat pump units 18 in operation can be reduced.

[0037] In a further preferred embodiment, Figure 5 To the attached Figure 7 As shown, the heating system also includes a photothermal system 26 for heating the working medium. The photothermal system 26 is connected in parallel with the heat pump unit 18 between the first outlet 7 and the second inlet 6. The use of the photothermal system 26 improves the utilization rate of solar energy, thereby reducing the operating costs of the heat pump unit 18.

[0038] A third aspect of the present invention provides a heating method using the heating system according to any of the above embodiments, comprising the following steps: Keep the first stop valve 21, the second stop valve 22 and the heat pump station 19 in the open state; The heat supply pump station 19 extracts the working medium in the second area 4 at the second outlet 8 and pumps the working medium into the main pipeline 20. Part of the working medium flows through the first stop valve 21, the second stop valve 22, and the check valve 23 in sequence in the main pipeline 20 and returns to the first area 3 from the first inlet 5. Another part of the working medium flows through the control valve 25 and the branch pipeline 24 and returns to the main pipeline 20; Based on the heat demand, the flow rates of the working medium in the main pipeline 20 and the branch pipeline 24 are adjusted through the control valve 25; The heat pump unit 18 is turned on. The heat pump unit 18 extracts the working medium in the first area 3 at the first outlet and heats it. The heated working medium flows into the second area 4 at the second inlet.

[0039] In some preferred embodiments, the liquid level H in the first area 3 is obtained.

[0040] If: H ≤ H1, the heat pump unit 18 stops operating, the heat supply pump station 19 remains running, and the working medium is supplemented into the box body 1; If: H1 < H < H2 and the liquid level H is in a continuously decreasing state, the flow rate of the working medium extracted by the heat pump unit 18 in the first area 3 is reduced; If: H ≥ H3 and the liquid level H is in a continuously increasing state, the flow rate of the working medium extracted by the heat pump unit 18 in the first area 3 is increased; Wherein, H1 is the protection liquid level, H2 is the lower limit liquid level, and H3 is the upper limit liquid level.

[0041] It should be noted that the shutdown of the heat pump unit 18 also belongs to a way of overhaul and maintenance. At this time, the first stop valve 21 and the second stop valve 22 need to be manually closed. Since the temperature of the supplemented working medium does not reach the heat supply requirement, if the first stop valve 21 and the second stop valve 22 are kept open at this time, the working medium that does not meet the heat supply requirement temperature supplying heat to the heat-using equipment will affect the production of the heat-using equipment. After the liquid level is supplemented to the effective water level, the first stop valve 21 and the second stop valve 22 are manually opened again.

[0042] In addition, H1 < H < H2 and the liquid level H being in a continuously decreasing state means that the average liquid level in a certain time period is between H1 and H2, and in the subsequent consecutive multiple time periods, the average liquid level decreases successively. Similarly, H ≥ H3 and the liquid level H being in a continuously increasing state means that the average liquid level in a certain time period is greater than H3, and in the consecutive multiple time periods, the average liquid level increases successively.

[0043] In a further preferred embodiment, when several heat pump units 18 are configured, the flow rate of the working medium extracted from the first region 3 by the heat pump units 18 can be increased by increasing the number of heat pump units 18 put into operation; when several heat pump units 18 are configured and the number of units put into operation is at least two, the working medium extracted by the heat pump units 18 from the first region 3 can be reduced by reducing the number of heat pump units 18 put into operation.

[0044] Specifically, when H ≥ H3 and the liquid level H is in a continuous rising state, it indicates that the flow rate of the working medium at the first inlet 5 is greater than the flow rate of the working medium at the first outlet 7, and it also indicates that the heat demand of the heat-consuming equipment is large. At this time, to avoid the liquid level in the first region 3 from being too high, the flow rate of the working medium extracted by the heat pump units 18 from the first region 3 needs to be increased, which can be directly achieved by increasing the number of heat pump units 18 put into operation when several heat pump units 18 are configured.

[0045] When H1 < H < H2 and the liquid level H is in a continuous falling state, it indicates that the flow rate of the working medium at the first inlet 5 is less than the flow rate of the working medium at the first outlet 7, and it also indicates that the heat demand of the heat-consuming equipment is small. At this time, to avoid the liquid level in the first region 3 from being too low, the flow rate of the working medium extracted by the heat pump units 18 from the first region 3 needs to be reduced, which can be directly achieved by reducing the number of heat pump units 18 put into operation when several heat pump units 18 are configured and the number of units put into operation is at least two. When the number of heat pump units 18 put into operation is only one, the heat pump unit 18 can be shut down.

[0046] In some preferred embodiments, the electricity price at the current time period is obtained.

[0047] If the electricity price at the current time period is at a low valley electricity price, then the temperature of the working medium flowing out of the second outlet 8 is maintained at a state not lower than T1, otherwise the temperature of the working medium flowing out of the second outlet 8 is maintained at a state not lower than T2; where T1 > T2, T1 is the heat storage temperature, and T2 is the heat supply temperature.

[0048] An example is illustrated as follows: First, the heat storage temperature T1 is set to 55 °C and the heat supply temperature T2 is set to 45 °C.

[0049] The first case: The electricity price at the current time period is not at a low valley electricity price. The temperature of the working medium at the second outlet 8 remains at 45 °C, the temperature of the working medium at the first inlet 5 is 40 °C, and the temperature of the working medium in the first region 3 rises to 45 °C after being heated by the heat pump unit 18.

[0050] Case 2: During the off-peak electricity price period, the working medium temperature at the second outlet 8 is initially 45°C, and the working medium temperature at the first inlet 5 is 40°C. The working medium in the first region 3 is heated by the heat pump unit 18 and rises to 55°C. The working medium temperature at the second outlet 8 then remains at 55°C. The working medium flowing back into the first region 3 through the first inlet 5 is heated by the heat pump unit 18 and remains at 55°C.

[0051] In summary, although heat pump unit 18 consumes more power in the second scenario to heat the 40°C working medium to 55°C, the heating cost in the second scenario remains essentially the same as in the first scenario during off-peak electricity periods, and the heat storage tank in the second scenario can store more heat. Of course, the specific heat storage and heating temperature settings need to be adjusted based on the actual off-peak electricity price, the power of heat pump unit 18, and the heat demand of the heating equipment.

[0052] In a further preferred embodiment, when a phase-change material is installed in water storage area 13, a threshold temperature T3 is set, where the phase-change temperature of the phase-change material is lower than T1, and T1>T3>T2. If the current electricity price is not off-peak and the working medium temperature flowing out of second outlet 8 is lower than T3, heat pump unit 18 is turned on and the working medium temperature flowing out of second outlet 8 is maintained at or above T2.

[0053] In this embodiment, the temperature of the phase change material must be lower than the heat storage temperature to ensure that the phase change material can fully store heat during low-peak hours, so that the phase change material can provide heat to ensure stable heating when the working medium temperature drops and the heat pump unit 18 is not started.

[0054] In addition, a threshold temperature is set that is lower than the heat storage temperature and higher than the heat supply temperature to improve the heat supply stability.

[0055] For example, let's set the threshold temperature to 48°C. If the working medium temperature flowing out of second outlet 8 is above 48°C during the current electricity price period and the working medium is not at a low point, the heat pump unit 18 does not need to operate, and the working medium temperature is maintained by heat released by the phase change material. If the working medium temperature flowing out of second outlet 8 is below 48°C, indicating that the heat stored in the phase change material is insufficient to maintain the working medium's heating temperature, the heat pump unit 18 is activated to heat the working medium, saving costs while ensuring stable heating.

[0056] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0057] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. To avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0058] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A partitioned hot water storage tank, characterized in that: The invention comprises a box body (1), wherein a first partition plate (2) and a second partition plate (11) are fixedly provided in the box body (1), wherein the first partition plate (2) divides the internal space of the box body (1) into a first area (3) and a second area (4) which are not connected to each other, and the second partition plate (11) divides the second area (4) into a water inlet area (12) and a water storage area (13), wherein the working medium in the water inlet area (12) can overflow from the top of the second partition plate (11) to the water storage area (13), and a first notch (14) for connecting the water inlet area (12) and the water storage area (13) is provided at the bottom of the second partition plate (11); The box body (1) is provided with a first inlet (5), a second inlet (6), a first outlet (7) and a second outlet (8); the first inlet (5) and the first outlet (7) are both connected to the first area (3); the second inlet (6) is connected to the water inlet area (12); and the second outlet (8) is connected to the water storage area (13).

2. The partitioned hot water storage tank according to claim 1, characterized in that: A second notch (9) for connecting the first area (3) and the water inlet area (12) is provided on the top of the first partition (2); the working medium in the first area (3) can overflow from the second notch (9) to the water inlet area (12); an overflow port (10) is provided on the box body (1), and the overflow port (10) is connected to the first area (3); The height of the overflow port (10) is higher than the height of the second notch (9), and the top height of the second partition (11) is lower than the height of the second notch (9).

3. The partitioned hot water storage tank according to claim 1, characterized in that: A spoiler (15) for disturbing the working medium flowing out of the first notch (14) is fixedly provided in the water storage area (13), and a gap is provided between the spoiler (15) and the inner bottom wall of the box body (1).

4. The partitioned hot water storage tank according to claim 1, characterized in that: A guide plate (16) is provided in the first area (3) and / or the second area (4).

5. The partitioned hot water storage tank according to claim 1, characterized in that: A phase change material for heat storage is provided in the water storage area (13), and the phase change temperature of the phase change material is not lower than the heating temperature.

6. A heating system using the partitioned hot water storage tank according to any one of claims 1 to 5, characterized in that: The heating system further comprises: a heat pump unit (18), wherein the liquid inlet of the heat pump unit (18) is in communication with the first outlet (7), and the liquid outlet of the heat pump unit (18) is in communication with the second inlet (6); A heat supply pump station (19), wherein the liquid inlet end of the heat supply pump station (19) is connected to the second outlet (8); a main pipeline (20), one end of the main pipeline (20) being in communication with the liquid outlet of the heat supply pump station (19), and the other end being in communication with the first inlet (5); a first stop valve (21), a second stop valve (22), and a one-way valve (23) being sequentially arranged on the main pipeline (20) along the flow direction of the working medium; the working medium in the main pipeline (20) between the first stop valve (21) and the second stop valve (22) is used to supply heat to the heat-using equipment; A branch pipeline (24), the branch pipeline (24) is connected to the main pipeline (20), one end of the branch pipeline (24) is connected upstream of the first stop valve (21), and the other end is connected between the second stop valve (22) and the check valve (23); A control valve (25), the control valve (25) is used to adjust the flow rate of the working medium flowing from the main pipeline (20) to the branch pipeline (24).

7. The heating system according to claim 6, characterized in that A plurality of the heat pump units (18) are provided and are connected in parallel between the first outlet (7) and the second inlet (6); Preferably, the heating system further includes a solar thermal system (26) for heating the working medium, and the solar thermal system (26) and the heat pump units (18) are connected in parallel between the first outlet (7) and the second inlet (6).

8. A heating method using the heating system according to claim 6 or 7, characterized in that: It includes the following steps: Keep the first stop valve (21), the second stop valve (22), and the heating pumping station (19) in the open state; The heating pumping station (19) extracts the working medium in the second area (4) from the second outlet (8) and pumps the working medium into the main pipeline (20). Part of the working medium flows through the first stop valve (21), the second stop valve (22), and the check valve (23) in sequence in the main pipeline (20) and returns to the first area (3) from the first inlet (5). Another part of the working medium flows through the control valve (25) and the branch pipeline (24) and returns to the main pipeline (20); Based on the heat demand, adjust the flow rates of the working medium in the main pipeline (20) and the branch pipeline (24) through the control valve (25); Open the heat pump unit (18), the heat pump unit (18) extracts the working medium in the first area (3) from the first outlet (7) and heats it, and the heated working medium flows into the second area (4) from the second inlet (6).

9. The heating method according to claim 8, characterized in that: Obtain the liquid level H in the first area (3); If: H ≤ H1, then the heat pump unit (18) stops running, keep the heating pumping station (19) running, and supplement the working medium into the box body (1); If: H1 < H < H2 and the liquid level H is in a continuous decreasing state, reduce the flow rate of the working medium extracted by the heat pump unit (18) in the first area (3); If: H ≥ H3 and the liquid level H is in a continuous increasing state, increase the flow rate of the working medium extracted by the heat pump unit (18) in the first area (3); Wherein, H1 is the protection liquid level, H2 is the lower limit liquid level, and H3 is the upper limit liquid level; Preferably, when there are a plurality of the heat pump units (18), the flow rate of the working medium extracted by the heat pump unit (18) in the first area (3) can be increased by increasing the number of the heat pump units (18) put into operation; When there are a plurality of the heat pump units (18) and the number of units put into operation is at least two, the working medium extracted by the heat pump unit (18) in the first area (3) can be reduced by reducing the number of the heat pump units (18) put into operation.

10. The heating method according to claim 8, characterized in that: Obtain the electricity price at the current time period; If the electricity price at the current time period is at the low valley electricity, then maintain the temperature of the working medium flowing out of the second outlet (8) at a state not lower than T1, otherwise maintain the temperature of the working medium flowing out of the second outlet (8) at a state not lower than T2; Among them, T1>T2, T1 is the heat storage temperature, T2 is the heating temperature; Preferably, when a phase change material is configured in the water storage area (13), a threshold temperature T3 is set, wherein: the phase change temperature of the phase change material is lower than T1, and T1>T3>T2; If the electricity price in the current period is not off-peak and the temperature of the working medium flowing out of the second outlet (8) is lower than T3, the heat pump unit (18) is turned on and the temperature of the working medium flowing out of the second outlet (8) is maintained at a state not lower than T2.

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