Device for online switching of the working state of an energy storage tank, unit system and header system based on the device

Abstract

Device for online switching of the working state of an energy storage tank, unit system and header system based on the device, relating to the field of thermoelectric energy storage. The present invention is to solve the problem that the frequent start-stop switching of the energy storage pump and the heat release pump of the energy storage tank will affect the operation of the pump set. The device for online switching of the working state of the energy storage tank, the unit system and the header system based on the device of the present invention can switch the working state of the energy storage tank only by controlling the valve action without starting and stopping the pump set. While realizing the continuous operation of the energy storage tank for 24 hours in a central heating project, the operation reliability of the pump set is ensured, and the construction and operation economy and stability of the system are improved.

Description

Technical Field

[0001] The present invention belongs to the field of thermoelectricity, and particularly relates to a storage device for thermoelectricity. Background Art

[0002] Currently, energy storage tanks are mostly used to store heat generated by consuming the on-grid electricity through equipment such as electric boilers during power peak regulation in thermal power plants, and this part of the heat is used for heating the heat network. To ensure a single and stable thermocline in the energy storage tank, during the operation design of the energy storage tank system, the energy storage tank needs to completely complete the injection or discharge of hot water when switching operations. Due to the power peak regulation being carried out in time periods, the energy storage tank operates intermittently, that is, the heat storage and heat release of the energy storage tank operate intermittently.

[0003] However, when the energy storage tank is applied to a heating project that requires continuous operation for 24 hours, that is, the heat storage duration and the heat release duration are both 12 hours, or the sum of the heat storage duration and the heat release duration is 24 hours, or the heat storage cycle and the heat release cycle continuously and uninterruptedly alternate. The original system needs to realize the switching of heat storage and heat release operations through the start-stop switching of the heat storage pump and the heat release pump. Frequent start-stop is bound to affect the safe and reliable operation of the pump, shortening the service life of the pump group. At the same time, using the start-stop of the heat storage pump and the heat release pump respectively to drive the switching operation of the heat storage and heat release systems is not conducive to the project economy and system stability; when the flowing medium of the heat storage pump or the heat release pump is high-temperature water, special sealing treatment and cooling devices need to be installed on the pump body, which also increases the system cost. Summary of the Invention

[0004] The present invention is to solve the problem that the frequent start-stop switching of the heat storage pump and the heat release pump of the energy storage tank will affect the operation of the pump group, and now provides a device for online switching of the working state of the energy storage tank, a unit system and a header system based on this device.

[0005] The device for online switching of the working state of the energy storage tank includes: a high-temperature water inlet passage, a high-temperature water outlet passage, a low-temperature water outlet passage, a low-temperature water inlet passage, a high-temperature water interface passage and a low-temperature water interface passage.

[0006] The high-temperature water inlet passage is successively connected in series with a high-temperature part regulating valve group and a check valve b8 from the inlet end to the outlet end.

[0007] The high-temperature water outlet passage is successively connected in series with a check valve b7 and a fifth valve from the outlet end to the inlet end.

[0008] One end to the other end of the high-temperature water interface passage is successively connected in series with a valve a8 and a gate valve d2.

[0009] The outlet end of the high-temperature water inlet passage and the inlet end of the high-temperature water outlet passage are simultaneously communicated with one end of the high-temperature water interface passage, and the other end of the high-temperature water interface passage serves as the high-temperature water interface end of the energy storage tank.

[0010] The low-temperature water inlet passage is successively connected in series with a No. 4 valve, a pump group, a low-temperature section regulating valve group, and a check valve b6 from the water inlet end to the water outlet end. A check valve b3 is connected in parallel at both ends of the pump group, and the flow direction of the check valve b3 is from the water inlet of the pump group to the water outlet of the pump group. A branch is provided between the water outlet end of the low-temperature water inlet passage and the water inlet of the pump group. The branch is successively connected in series with a check valve b4 and a No. 1 valve from the water inlet to the water outlet.

[0011] The low-temperature water outlet passage is successively connected in series with a check valve b5 and a No. 3 valve from the water outlet end to the water inlet end. The water inlet end of the low-temperature water outlet passage is communicated with the water outlet of the pump group.

[0012] The water outlet end of the low-temperature water inlet passage is communicated with one end of the low-temperature water interface passage. A gate valve d1 is provided on the low-temperature water interface passage, and the other end of the low-temperature water interface passage serves as the low-temperature water interface end of the energy storage tank.

[0013] The unit system based on the above device includes a plurality of devices for online switching of the working state of the energy storage tank, a high-temperature water inlet main road, a high-temperature water outlet main road, a low-temperature water outlet main road, and a low-temperature water inlet main road;

[0014] The ends of the low-temperature water outlet main road and the low-temperature water inlet main road are connected by a check valve. The head end of the low-temperature water outlet main road is the low-temperature water outlet end, and the head end of the low-temperature water inlet main road is the low-temperature water inlet end.

[0015] The water inlet end of the low-temperature water inlet passage of each device for online switching of the working state of the energy storage tank is connected to the low-temperature water inlet main road, the water outlet end of the low-temperature water outlet passage of each device for online switching of the working state of the energy storage tank is connected to the low-temperature water outlet main road, the water outlet end of the high-temperature water outlet passage of each device for online switching of the working state of the energy storage tank is connected to the high-temperature water outlet main road, and the water inlet end of the high-temperature inlet and outlet passage of each device for online switching of the working state of the energy storage tank is connected to the high-temperature water inlet main road.

[0016] A gate valve is provided on the low-temperature water inlet main road, and the gate valve is located between the device for online switching of the working state of the energy storage tank at the end and the check valve.

[0017] A plurality of devices for online switching of the working state of the energy storage tank correspond to a plurality of energy storage tanks one by one and are respectively used to be connected to the corresponding energy storage tanks.

[0018] The header system includes a plurality of sub-devices, a high-temperature water inlet main road, a high-temperature water outlet main road, and a header line;

[0019] Each sub-device includes: a high-temperature water inlet passage, a high-temperature water outlet passage, a low-temperature water inlet passage, a high-temperature water interface passage, and a low-temperature water interface passage.

[0020] The high-temperature water inlet passage is successively connected in series with a high-temperature section regulating valve group and a check valve b8 from the water inlet end to the water outlet end.

[0021] The high-temperature water outlet passage is serially connected with a check valve b7 and a fifth valve in sequence from the water outlet end to the water inlet end.

[0022] One end to the other end of the high-temperature water interface passage is serially connected with a valve a8 and a gate valve d2 in sequence.

[0023] The water outlet end of the high-temperature water inlet passage and the water inlet end of the high-temperature water outlet passage are simultaneously connected to one end of the high-temperature water interface passage, and the other end of the high-temperature water interface passage serves as the high-temperature water interface end of the energy storage tank.

[0024] The low-temperature water inlet passage is serially connected with a low-temperature part regulating valve group and a check valve b6 in sequence from the water inlet end to the water outlet end.

[0025] The water outlet end of the low-temperature water inlet passage is connected to one end of the low-temperature water interface passage. A gate valve d1 is provided on the low-temperature water interface passage, and the other end of the low-temperature water interface passage serves as the low-temperature water interface end of the energy storage tank.

[0026] The main pipeline includes a fourth valve, a pump group, a third valve, and a check valve b5 that are serially connected in sequence from the pipeline inlet to the outlet. A check valve b3 is connected in parallel at both ends of the pump group, and the flow direction of this check valve b3 is from the water inlet of the pump group to the water outlet of the pump group.

[0027] The water outlet end of the low-temperature water inlet passage of each sub-device is simultaneously connected to the water inlet of the pump group through a check valve b4 and a first valve. The water inlet end of the low-temperature water inlet passage of each sub-device is simultaneously connected to the water outlet of the pump group. The water inlet end of the high-temperature water inlet passage of each sub-device is connected to the high-temperature water inlet main pipeline, and the water outlet end of the high-temperature water outlet passage of each sub-device is connected to the high-temperature water outlet main pipeline.

[0028] The main function of the above pump group: When the energy storage tank releases heat, it provides power for the low-temperature water to enter the energy storage tank to overcome the height pressure difference of the tank body and the resistance of the pipeline; when the energy storage tank stores heat, it replaces the high-temperature water heat storage pump and provides power for the heat storage cycle by boosting the pressure of the low-temperature water. Since the low-temperature water medium parameters are low, the pump body does not require special sealing and additional cooling devices, the equipment construction cost is low, and the reliability is high. At the same time, a set of pump groups drives the operation of the energy storage tank. Compared with the energy storage tank operation system in the thermal power plant peak shaving project that uses two sets of pump groups, namely a heat storage pump and a heat release pump, at least one set of pump groups can be saved. When the energy storage tank switches the working state during the heating season, the pump group operates constantly without starting and stopping, and the operation parameters of the pump group are low, and the equipment reliability is high, which is conducive to saving project costs.

[0029] In the heat release state, the low-temperature water is led out from the return water pipe network of the heating station through an automatic water filter to the water inlet end of the low-temperature water inlet passage. The high-temperature water of the energy storage tank is connected to the front of the return water heat network circulation pump of the heating station through the water outlet end of the high-temperature water outlet passage. Compared with the high-temperature water of the energy storage tank in the thermal power plant peak shaving project that is directly connected to the heat network supply pipeline through a heat release pump, the pump group can save 100 m of head.

[0030] The present invention can switch the working state of the energy storage tank only by controlling the valve action without starting and stopping the pump set. While realizing the continuous 24-hour operation of the energy storage tank in the central heating project, the operation reliability of the pump set is ensured, and the construction, operation economy and stability of the system are improved. To sum up, the advantage of the present invention is that the pump set integrates multiple functions, and the specific advantages are as follows:

[0031] (1) When the energy storage tank switches its operating state, there is no need to start and stop the pump;

[0032] (2) Only one set of pump set is provided, which has multiple functions, high equipment utilization rate, saves construction costs, and improves the economy and stability of the system;

[0033] (3) The pump set pressurizes the hot water return network to the tank and flows by gravity to the front of the hot water circulation pump by using the height difference of the tank body. The pump set only needs to overcome the resistance of the pipeline and the height difference of the tank body, and the energy-saving effect is better;

[0034] (4) Due to switching the working state of the energy storage tank, in order to ensure the stability of the thermocline in the energy storage tank, check valves are installed on the pipelines that may cause backflow, improving the operation safety. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 is a schematic structural diagram of the device for online switching of the working state of the energy storage tank according to the present invention;

[0036] Figure 2 is a schematic diagram of the valve state during the heat release process of the device for online switching of the working state of the energy storage tank, where black indicates closed;

[0037] Figure 3 is a schematic diagram of the valve state during the heat storage process of the device for online switching of the working state of the energy storage tank, where black indicates closed;

[0038] Figure 4 is a schematic structural diagram of the unit system;

[0039] Figure 5 is a schematic structural diagram of the header system. DETAILED DESCRIPTION OF THE INVENTION

[0040] DETAILED DESCRIPTION OF THE INVENTION 1: Refer to Figure 1 、 2 and 3 to specifically illustrate this embodiment. The device for online switching of the working state of the energy storage tank described in this embodiment includes: a high-temperature water inlet passage, a high-temperature water outlet passage, a low-temperature water outlet passage, a low-temperature water inlet passage, a high-temperature water interface passage and a low-temperature water interface passage,

[0041] A high-temperature water regulating valve group and a check valve b8 are sequentially connected in series in the high-temperature water inlet passage from the inlet end to the outlet end,

[0042] The high-temperature water outlet passage is successively connected in series with a check valve b7 and a No. 5 valve (5) from the water outlet end to the water inlet end.

[0043] One end to the other end of the high-temperature water interface passage is successively connected in series with a valve a8 and a gate valve d2.

[0044] The water outlet end of the high-temperature water inlet passage and the water inlet end of the high-temperature water outlet passage are simultaneously connected to one end of the high-temperature water interface passage, and the other end of the high-temperature water interface passage serves as the high-temperature water interface end of the energy storage tank.

[0045] The low-temperature water inlet passage is successively connected in series with a No. 4 valve (4), a pump set, a low-temperature part regulating valve group, and a check valve b6 from the water inlet end to the water outlet end. A check valve b3 is connected in parallel at both ends of the pump set, and the flow direction of the check valve b3 is from the water inlet of the pump set to the water outlet of the pump set. A branch is provided between the water outlet end of the low-temperature water inlet passage and the water inlet of the pump set. The branch is successively connected in series with a check valve b4 and a No. 1 valve (1) from the water inlet of the pump set to the water outlet of the low-temperature water inlet passage.

[0046] The low-temperature water outlet passage is successively connected in series with a check valve b5 and a No. 3 valve (3) from the water outlet end to the water inlet end. The water inlet end of the low-temperature water outlet passage is connected to the water outlet of the pump set.

[0047] The water outlet end of the low-temperature water inlet passage is connected to one end of the low-temperature water interface passage. A gate valve d1 is provided on the low-temperature water interface passage, and the other end of the low-temperature water interface passage serves as the low-temperature water interface end of the energy storage tank.

[0048] Further, the high-temperature part regulating valve group includes: a No. 6 valve (6), a valve a10, a valve a9, and a valve a11.

[0049] The No. 6 valve (6), the valve a10, and the valve a9 are successively connected in series between the high-temperature water outlet during heat storage of the heating or heat exchange device and the check valve b8, and the valve a11 is connected in parallel with the No. 6 valve (6), the valve a10, and the valve a9.

[0050] The low-temperature part regulating valve group includes: a No. 2 valve (2), a valve a5, a valve a6, and a valve a7.

[0051] The No. 2 valve (2), the valve a5, and the valve a6 are successively connected in series between the water outlet of the pump set and the check valve b6, and the valve a7 is connected in parallel with the No. 2 valve (2), the valve a5, and the valve a6.

[0052] Further, the pump set includes two pumps connected in parallel with each other.

[0053] A valve a1 and a valve a3 are respectively connected in series at both ends of one pump. A check valve b1 is connected in series between the pump and the valve a3. The valve a1 is adjacent to the No. 4 valve (4), and the valve a3 is adjacent to the low-temperature part regulating valve group.

[0054] Another pump is connected in series with valve a2 and valve a4 at both ends respectively. A check valve b2 is connected in series between this pump and valve a4. Valve a2 is adjacent to the fourth valve (4), and valve a4 is adjacent to the low-temperature section regulating valve group.

[0055] Furthermore, the first valve (1), the second valve (2), the third valve (3), the fourth valve (4), the fifth valve (5), the sixth valve (6), valve a1, valve a2, valve a3, valve a4, valve a6, valve a7, valve a8, valve a9, and valve a11 are all butterfly valves, and valve a5 and valve a10 are regulating valves.

[0056] Furthermore, a flow measurement device c2 is provided between valve a8 and gate valve d2, and a flow measurement device c1 is provided between check valve b6 and gate valve d1.

[0057] The working principle of this embodiment is as follows:

[0058] As Figure 2 shown, in the exothermic state, the first valve 1, the third valve 3, and the sixth valve 6 are in the closed state, and the second valve 2, the fourth valve 4, and the fifth valve 5 are in the open state. The low-temperature water is pressurized by the pump group and enters the low-temperature water interface of the energy storage tank through the low-temperature section regulating valve group. The high-temperature water passes through the fifth valve 5 and utilizes the pressure difference of the tank body height to lead to the front of the heat network circulating pump in the heat supply station. When the heat storage tank switches from the exothermic state to the heat storage state, the action sequence of the valves is the third valve 3, the sixth valve 6, the second valve 2, the first valve 1, the fourth valve 4, the fifth valve 5. During the switching process, there is no need to start or stop the pump group.

[0059] As Figure 3 shown, in the heat storage state, the first valve 1, the third valve 3, and the sixth valve 6 are in the open state, and the second valve 2, the fourth valve 4, and the fifth valve 5 are in the closed state. The low-temperature water passes through the first valve 1 from the low-temperature water interface of the energy storage tank, is pressurized by the pump group, and then enters the heat storage heating device or heat exchange device through the third valve 3. The heated high-temperature water is connected to the high-temperature water interface of the energy storage tank through the high-temperature section regulating valve group. When the heat storage tank switches from the heat storage state to the exothermic state, the action sequence of the valves is the fourth valve 4, the fifth valve 5, the first valve 1, the second valve 2, the third valve 3, the sixth valve 6. During the switching process, there is no need to start or stop the pump group.

[0060] In this embodiment, a fourth valve 4 is provided in front of the low-temperature water side pump group. A branch is led out from the low-temperature water pipeline behind the pump group and leads to the low-temperature water inlet of the heating device or heat exchange device during heat storage. A check valve and a third valve (butterfly valve / gate valve) are provided on the branch. The check valve can prevent the reverse flow of the low-temperature water medium during the system switching process, and the on-off valve is used to cut off and control the system switching. A branch is led out after the low-temperature water inlet regulating valve group between the pump and the energy storage tank (a second valve 2 is provided in the regulating valve group to isolate the regulating valve group), and is connected between the pump group and the fourth valve 4. A check valve and a first valve 1 (butterfly valve / gate valve) are provided on the branch. The check valve can prevent the reverse flow of the low-temperature water medium during the system switching process, and the first valve 1 is used to cut off and control the system switching. A fifth valve 5 is provided on the high-temperature water heat release pipeline. The high-temperature water outlet of the heating device or heat exchange device during heat storage is connected to the front of the fifth valve 5 through a regulating valve group pipeline (a sixth valve 6 is provided in the regulating valve group to isolate the regulating valve group).

[0061] To save system costs, in this embodiment, except for the gate valves used for valves with high tightness requirements when cutting off from the energy storage tank, the rest of the on-off valves use butterfly valves instead of gate valves. Flow, pressure, and temperature monitoring devices are provided in front of the low-temperature water and high-temperature water interfaces of the energy storage tank, which are used for the PLC to precisely control the action valves to ensure that the water temperature at the energy storage tank interface meets the requirements of the stable inclined temperature layer of the tank body.

[0062] Specific Embodiment Two: Refer to Figure 4 This specific embodiment will be specifically described. The unit system based on the device described in Specific Embodiment One of this embodiment includes multiple devices for online switching the working state of the energy storage tank, a high-temperature water inlet main road, a high-temperature water outlet main road, a low-temperature water outlet main road, and a low-temperature water inlet main road;

[0063] The ends of the low-temperature water outlet main road and the low-temperature water inlet main road are connected through a check valve. The head end of the low-temperature water outlet main road is the low-temperature water outlet end, and the head end of the low-temperature water inlet main road is the low-temperature water inlet end.

[0064] The water inlet ends of the low-temperature water inlet passages of each device for online switching the working state of the energy storage tank are all connected to the low-temperature water inlet main road, the water outlet ends of the low-temperature water outlet passages of each device for online switching the working state of the energy storage tank are all connected to the low-temperature water outlet main road, the water outlet ends of the high-temperature water outlet passages of each device for online switching the working state of the energy storage tank are all connected to the high-temperature water outlet main road, and the water inlet ends of the high-temperature water inlet and outlet passages of each device for online switching the working state of the energy storage tank are all connected to the high-temperature water inlet main road.

[0065] A gate valve is provided on the low-temperature water inlet main road, and this gate valve is located between the last device for online switching the working state of the energy storage tank and the check valve.

[0066] The multiple devices for online switching the working state of the energy storage tank correspond to multiple energy storage tanks one by one and are respectively used to be connected to the corresponding energy storage tanks.

[0067] In centralized heating application projects, multiple energy storage tanks are commonly used. Multiple devices can be configured into a unit system, and multiple energy storage tank systems operate in parallel.

[0068] Embodiment 3: Refer to Figure 5 Specifically describe this embodiment. The header pipe system described in this embodiment is characterized by including multiple sub-devices, a high-temperature water inlet main road, a high-temperature water outlet main road, and a header pipe line;

[0069] Each sub-device includes: a high-temperature water inlet passage, a high-temperature water outlet passage, a low-temperature water inlet passage, a high-temperature water interface passage, and a low-temperature water interface passage.

[0070] The high-temperature water inlet passage is sequentially connected in series with a high-temperature part regulating valve group and a check valve b8 from the inlet end to the outlet end.

[0071] The high-temperature water outlet passage is sequentially connected in series with a check valve b7 and a fifth valve (5) from the outlet end to the inlet end.

[0072] One end of the high-temperature water interface passage to the other end is sequentially connected in series with a valve a8 and a gate valve d2.

[0073] The outlet end of the high-temperature water inlet passage and the inlet end of the high-temperature water outlet passage are simultaneously connected to one end of the high-temperature water interface passage, and the other end of the high-temperature water interface passage serves as the high-temperature water interface end of the energy storage tank;

[0074] The low-temperature water inlet passage is sequentially connected in series with a low-temperature part regulating valve group and a check valve b6 from the inlet end to the outlet end.

[0075] The outlet end of the low-temperature water inlet passage is connected to one end of the low-temperature water interface passage. A gate valve d1 is provided on the low-temperature water interface passage, and the other end of the low-temperature water interface passage serves as the low-temperature water interface end of the energy storage tank;

[0076] The header pipe line includes a fourth valve (4), a pump group, a third valve (3), and a check valve b5 sequentially connected in series from the line inlet to the outlet. A check valve b3 is connected in parallel at both ends of the pump group, and the flow direction of this check valve b3 is from the inlet of the pump group to the outlet of the pump group.

[0077] The outlet end of the low-temperature water inlet passage of each sub-device is simultaneously connected to the inlet of the pump group through a check valve b4 and a first valve (1). The inlet end of the low-temperature water inlet passage of each sub-device is simultaneously connected to the outlet of the pump group. The inlet end of the high-temperature water inlet passage of each sub-device is connected to the high-temperature water inlet main road, and the outlet end of the high-temperature water outlet passage of each sub-device is connected to the high-temperature water outlet main road.

[0078] Compared with the first specific embodiment and the second specific embodiment, in this embodiment, the pump sets in each set of devices are cancelled, and a large-flow pump set is arranged on the low-temperature water main pipe to drive multiple energy storage tanks at the same time, forming a header system. The high and low temperature water of multiple energy storage tanks is connected to the corresponding main pipelines through branch pipes. The valve control logics of the two schemes are the same when the working states of the energy storage tanks are switched.

Claims

1. An apparatus for online switching of the working state of an energy storage tank, characterized in that, Comprising: A high-temperature water inlet passage, a high-temperature water outlet passage, a low-temperature water outlet passage, a low-temperature water inlet passage, a high-temperature water interface passage, and a low-temperature water interface passage. The high-temperature water inlet passage is sequentially connected in series with a high-temperature section regulating valve group and a check valve b8 from the inlet end to the outlet end. The high-temperature water outlet passage is sequentially connected in series with a check valve b7 and a fifth valve (5) from the outlet end to the inlet end. One end to the other end of the high-temperature water interface passage is sequentially connected in series with a valve a8 and a gate valve d2. The outlet end of the high-temperature water inlet passage and the inlet end of the high-temperature water outlet passage are simultaneously connected to one end of the high-temperature water interface passage, and the other end of the high-temperature water interface passage serves as the high-temperature water interface end of the energy storage tank. The low-temperature water inlet passage is sequentially connected in series with a fourth valve (4), a pump group, a low-temperature section regulating valve group, and a check valve b6 from the inlet end to the outlet end. A check valve b3 is connected in parallel at both ends of the pump group, and the flow direction of this check valve b3 is from the water inlet of the pump group to the water outlet of the pump group. A branch is provided between the outlet end of the low-temperature water inlet passage and the water inlet of the pump group. This branch is sequentially connected in series with a check valve b4 and a first valve (1) from the water inlet to the water outlet. The low-temperature water outlet passage is sequentially connected in series with a check valve b5 and a third valve (3) from the outlet end to the inlet end, and the inlet end of the low-temperature water outlet passage is connected to the water outlet of the pump group. The outlet end of the low-temperature water inlet passage is connected to one end of the low-temperature water interface passage, a gate valve d1 is provided on the low-temperature water interface passage, and the other end of the low-temperature water interface passage serves as the low-temperature water interface end of the energy storage tank. The high-temperature section regulating valve group includes: a sixth valve (6), a valve a10, a valve a9, and a valve a11. The sixth valve (6), the valve a10, and the valve a9 are sequentially connected in series between the high-temperature water outlet during heat storage of the heating or heat exchange device and the check valve b8, and the valve a11 is connected in parallel with the sixth valve (6), the valve a10, and the valve a9. The low-temperature section regulating valve group includes: a second valve (2), a valve a5, a valve a6, and a valve a7. The second valve (2), the valve a5, and the valve a6 are sequentially connected in series between the water outlet of the pump group and the check valve b6, and the valve a7 is connected in parallel with the second valve (2), the valve a5, and the valve a6. The pump group includes two pumps connected in parallel. One pump is sequentially connected in series with a valve a1 and a valve a3 at both ends. A check valve b1 is connected in series between this pump and the valve a3. The valve a1 is adjacent to the fourth valve (4), and the valve a3 is adjacent to the low-temperature section regulating valve group. The other pump is sequentially connected in series with a valve a2 and a valve a4 at both ends. A check valve b2 is connected in series between this pump and the valve a4. The valve a2 is adjacent to the fourth valve (4), and the valve a4 is adjacent to the low-temperature section regulating valve group.

2. The device for online switching of the working state of the energy storage tank according to claim 1, wherein, The first valve (1), the second valve (2), the third valve (3), the fourth valve (4), the fifth valve (5), the sixth valve (6), the valve a1, the valve a2, the valve a3, the valve a4, the valve a6, the valve a7, the valve a8, the valve a9, and the valve a11 are all butterfly valves. The valve a5 and the valve a10 are regulating valves.

3. The device for online switching of the working state of the energy storage tank according to claim 1, characterized in that A flow measurement device c2 is provided between the valve a8 and the gate valve d2, and a flow measurement device c1 is provided between the check valve b6 and the gate valve d1.

4. A unit system based on the device according to claim 1, 2 or 3, characterized in that, It includes multiple devices for online switching of the working state of energy storage tanks, a high-temperature water inlet main line, a high-temperature water outlet main line, a low-temperature water outlet main line, and a low-temperature water inlet main line; The ends of the low-temperature water outlet main line and the low-temperature water inlet main line are connected through a check valve. The head end of the low-temperature water outlet main line is the low-temperature water outlet end, and the head end of the low-temperature water inlet main line is the low-temperature water inlet end. The water inlet ends of the low-temperature water inlet passages of each device for online switching of the working state of energy storage tanks are all connected to the low-temperature water inlet main line. The water outlet ends of the low-temperature water outlet passages of each device for online switching of the working state of energy storage tanks are all connected to the low-temperature water outlet main line. The water outlet ends of the high-temperature water outlet passages of each device for online switching of the working state of energy storage tanks are all connected to the high-temperature water outlet main line. The water inlet ends of the high-temperature water inlet and outlet passages of each device for online switching of the working state of energy storage tanks are all connected to the high-temperature water inlet main line. A gate valve is provided on the low-temperature water inlet main line, and this gate valve is located between the device for online switching of the working state of the last energy storage tank and the check valve. The multiple devices for online switching of the working state of energy storage tanks correspond to multiple energy storage tanks one by one and are respectively used to be connected to the corresponding energy storage tanks.

5. A header system based on the device according to claim 1, 2 or 3, characterized in that, It includes multiple sub-devices, a high-temperature water inlet main line, a high-temperature water outlet main line, and a main pipe line; Each sub-device includes: a high-temperature water inlet passage, a high-temperature water outlet passage, a low-temperature water inlet passage, a high-temperature water interface passage, and a low-temperature water interface passage. The high-temperature water inlet passage is successively connected in series with a high-temperature part regulating valve group and a check valve b8 from the water inlet end to the water outlet end. The high-temperature water outlet passage is successively connected in series with a check valve b7 and a fifth valve (5) from the water outlet end to the water inlet end. One end to the other end of the high-temperature water interface passage is successively connected in series with a valve a8 and a gate valve d2. The water outlet end of the high-temperature water inlet passage and the water inlet end of the high-temperature water outlet passage are simultaneously connected to one end of the high-temperature water interface passage, and the other end of the high-temperature water interface passage serves as the high-temperature water interface end of the energy storage tank. The low-temperature water inlet passage is successively connected in series with a low-temperature part regulating valve group and a check valve b6 from the water inlet end to the water outlet end. The water outlet end of the low-temperature water inlet passage is connected to one end of the low-temperature water interface passage. A gate valve d1 is provided on the low-temperature water interface passage, and the other end of the low-temperature water interface passage serves as the low-temperature water interface end of the energy storage tank. The main pipe line includes a fourth valve (4), a pump group, a third valve (3), and a check valve b5 successively connected in series from the line inlet to the line outlet. A check valve b3 is connected in parallel at both ends of the pump group, and the flow direction of this check valve b3 is from the water inlet of the pump group to the water outlet of the pump group. The water outlet ends of the low-temperature water inlet passages of each sub-device are simultaneously connected to the water inlet of the pump group through a check valve b4 and a first valve (1). The water inlet ends of the low-temperature water inlet passages of each sub-device are simultaneously connected to the water outlet of the pump group. The water inlet ends of the high-temperature water inlet passages of each sub-device are all connected to the high-temperature water inlet main line. The water outlet ends of the high-temperature water outlet passages of each sub-device are all connected to the high-temperature water outlet main line.

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