Heating system based on pressure potential energy conversion

Abstract

The present invention discloses a heating system based on pressure potential energy conversion, which includes a primary pipe network, a secondary pipe network and a heat exchange device. The primary pipe network is used to introduce high-temperature and high-pressure hot water; the heat exchange device is used to receive the high-temperature and high-pressure hot water from the primary pipe network and reduce the pressure; the secondary pipe network is used to receive the high-temperature and low-pressure hot water after the pressure reduction by the heat exchange device and is used to heat the heating users; the high-temperature and high-pressure hot water from the primary pipe network pressurizes the low-temperature and low-pressure hot water after heating by the heating users from the secondary pipe network, then conveys and heats it, and circulates it back to the primary pipe network; the heating system based on pressure potential energy conversion of the present invention utilizes the pressure difference between the primary pipe network and the secondary pipe network. After reducing the pressure of the high-pressure hot water in the primary pipe network, it is directly supplied to the secondary pipe network; at the same time, after increasing the pressure of the low-temperature and low-pressure hot water in the secondary pipe network, it is conveyed to the return pipe network of the primary pipe network for heating. In this way, the temperature difference between the supply water and the return water in the primary pipe network is increased, and the hot water heat exchange efficiency is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of municipal heating and relates to a heating system based on pressure potential energy conversion. Background Art

[0002] In the existing municipal heating system based on pressure potential energy conversion, small-volume heat exchangers such as plate heat exchangers are usually used to transfer heat from the primary pipe network to the secondary pipe network. Affected by objective factors such as the heat exchange efficiency of the plate heat exchanger, the return water temperature of the primary pipe network is high, and the supply and return water temperature difference of the primary pipe network is small, which leads to a large flow of the heating system based on pressure potential energy conversion, and the waste heat of the power station condenser cannot be fully utilized, resulting in low thermal energy utilization and waste of resources. At present, the large temperature difference absorption heat exchange unit is large in size, and most heat exchange stations are difficult to accommodate. It is necessary to re-expropriate land to build structures, which makes implementation difficult.

[0003] In order to solve the above problems, a heating system based on pressure potential energy conversion is needed to reduce the supply and return water temperature difference of the primary pipe network and improve the utilization rate of thermal energy. Summary of the invention

[0004] In view of this, the present invention provides a heating system based on pressure potential energy conversion, which utilizes the pressure difference between the primary pipe network and the secondary pipe network to reduce the pressure of the high-pressure hot water in the primary pipe network and directly supply it to the secondary pipe network; at the same time, the pressure of the low-temperature and low-pressure hot water in the secondary pipe network is increased by utilizing the pressure potential energy of the primary pipe network, and then transported to the primary return water network for heating. In this way, the supply and return water temperature difference of the primary pipe network is increased, thereby improving the heat exchange efficiency of the hot water.

[0005] A heating system based on pressure potential energy conversion includes a primary pipe network, a secondary pipe network and a heat exchange device. The primary pipe network is used to introduce high-temperature and high-pressure hot water; the heat exchange device is used to receive the high-temperature and high-pressure hot water from the primary pipe network and reduce the pressure; the secondary pipe network is used to receive the high-temperature and low-pressure hot water after the pressure reduction by the heat exchange device and is used to provide heating for heating users. The high-temperature and high-pressure hot water from the primary pipe network pressurizes the low-temperature and low-pressure hot water from the secondary pipe network after heating, and then transports it for heating and circulates it to the primary pipe network.

[0006] Furthermore, the heat exchange device includes a heat exchange chamber I and a heat exchange chamber II, and the heat exchange chamber I and the heat exchange chamber II do not prepare high-temperature low-pressure hot water and low-temperature high-pressure hot water at the same time. Not preparing high-temperature low-pressure hot water and low-temperature high-pressure hot water at the same time means that when the heat exchange chamber I prepares high-temperature low-pressure hot water, the heat exchange chamber II prepares low-temperature high-pressure hot water, or when the heat exchange chamber I prepares low-temperature high-pressure hot water, the heat exchange chamber II prepares high-temperature low-pressure hot water.

[0007] Further, it further includes a heat exchange chamber III, which is used to prepare high-temperature and low-pressure hot water or low-temperature and high-pressure hot water. The heat exchange device has three operating modes: Mode I, Mode II, and Mode III. In Mode I, the heat exchange chamber I prepares and conveys high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber II prepares and conveys low-temperature and high-pressure hot water to the primary pipe network; in Mode II, the heat exchange chamber II prepares and conveys high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber III prepares and conveys low-temperature and high-pressure hot water to the primary pipe network; in Mode III, the heat exchange chamber III prepares and conveys high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber I prepares and conveys low-temperature and high-pressure hot water to the primary pipe network; the above-mentioned Mode I, Mode II, and Mode III operate in a cycle in sequence. The sequential cyclic operation of Mode I, Mode II, and Mode III means that after the operation of Mode I ends, Mode II operates, after the operation of Mode II ends, Mode III operates, and after the operation of Mode III ends, Mode I operates, so that Mode I, Mode II, and Mode III form a working cycle and continuously repeat the cycle to achieve continuous heating.

[0008] Further, it further includes a high-pressure return pipe for recovering low-temperature and high-pressure hot water. The primary pipe network has a high-pressure supply pipe for conveying high-temperature and high-pressure hot water to the heat exchange device. The high-pressure supply pipe and the high-pressure return pipe are respectively connected to the heat exchange chamber I, the heat exchange chamber II, and the heat exchange chamber III.

[0009] Further, the secondary pipe network has a low-pressure supply pipe for conveying low-temperature and low-pressure hot water to the heat exchange device and a heat supply pipe for receiving high-temperature and low-pressure hot water. The low-pressure supply pipe and the heat supply pipe are respectively connected to the heat exchange chamber I, the heat exchange chamber II, and the heat exchange chamber III.

[0010] Further, it further includes a pressure balance valve group, and the pressure balance valve group includes a high-pressure balance valve and a low-pressure balance valve. The high-pressure balance valve group is provided to transfer the pressure potential energy in the primary pipe network to the low-temperature and low-pressure hot water, so that the pressure of the low-temperature and low-pressure hot water is increased to become low-temperature and high-pressure hot water, that is, the return water of the primary pipe network. The low-pressure balance valve group is provided to provide a pressure relief channel for the high-temperature and high-pressure hot water, so that the high-temperature and high-pressure hot water can be depressurized to high-temperature and low-pressure hot water to meet the pressure requirements of heating. The high-pressure balance valve includes a high-pressure balance valve I, a high-pressure balance valve II, and a high-pressure balance valve III. The high-pressure balance valve I is arranged at the position where the high-pressure water supply pipe is connected to the heat exchange chamber I to balance the pressure between the high-pressure water supply pipe and the heat exchange chamber I to increase the water pressure in the heat exchange chamber I. The high-pressure balance valve II is arranged at the position where the high-pressure water supply pipe is connected to the heat exchange chamber II to balance the pressure between the high-pressure water supply pipe and the heat exchange chamber I to increase the water pressure in the heat exchange chamber I. The high-pressure balance valve III is arranged at the position where the high-pressure water supply pipe is connected to the heat exchange chamber III to balance the pressure between the high-pressure water supply pipe and the heat exchange chamber III to increase the water pressure in the heat exchange chamber I. The low-pressure balance valve includes a low-pressure balance valve I, a low-pressure balance valve II, and a low-pressure balance valve III. The low-pressure balance valve I is arranged at the position where the heat supply pipe is connected to the heat exchange chamber I to balance the pressure between the heat supply pipe and the heat exchange chamber I to reduce the water pressure in the heat exchange chamber I. The low-pressure balance valve II is arranged at the position where the heat supply pipe is connected to the heat exchange chamber II to balance the pressure between the heat supply pipe and the heat exchange chamber I to reduce the water pressure in the heat exchange chamber I. The low-pressure balance valve III is arranged at the position where the heat supply pipe is connected to the heat exchange chamber III to balance the pressure between the heat supply pipe and the heat exchange chamber III to reduce the water pressure in the heat exchange chamber I.

[0011] Further, it further includes a water mixer. The low-temperature and high-pressure hot water prepared by the heat exchange device flows into the water mixer and is mixed with the low-temperature and low-pressure hot water in the secondary pipe network and then flows out after cooling for heating. A part of the low-temperature and low-pressure hot water in the secondary pipe network enters the heat exchange device and is boosted to low-temperature and high-pressure hot water and then sent to the primary pipe network for heating. The remaining part enters the water mixer and is mixed with the high-temperature and low-pressure hot water, and the temperature is reduced to a suitable temperature for heating, and then sent to the user's home for heating. The previous cycle means the working cycle of the previous mode I, mode II, and mode III. When the heating system based on pressure potential energy conversion is put into use for the first time, only the high-temperature and high-pressure hot water in the primary pipe network needs to be injected into the heat exchange chamber I, and the low-temperature and low-pressure hot water from the secondary pipe network is injected into the heat exchange chamber II and the heat exchange chamber III, and then the working cycle mentioned in the technical solution of the present invention can be started. This is a processing method that can be understood or common by those skilled in the art, and will not be elaborated here.

[0012] Further, in the Mode I, the high-temperature and high-pressure hot water injected into the heat exchange chamber I by the high-pressure water supply pipe in the previous cycle of Mode III is stored in the heat exchange chamber I. The low-pressure balance valve I is opened, and the pressure in the heat exchange chamber I decreases. The high-temperature and high-pressure hot water becomes high-temperature and low-pressure hot water and is sent to the heat supply pipe. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber I. The high-pressure balance valve II is opened, and the pressure in the heat exchange chamber II increases. The low-temperature and low-pressure hot water injected into the heat exchange chamber II in the previous cycle of Mode II is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe is injected into the heat exchange chamber II.

[0013] Further, in the Mode II, the low-pressure balance valve II is opened, and the pressure in the heat exchange chamber II decreases. The high-temperature and high-pressure hot water injected into the heat exchange chamber II in Mode I reduces in pressure to become high-temperature and low-pressure hot water and is sent to the heat supply pipe. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber II. The high-pressure balance valve III is opened, and the pressure in the heat exchange chamber III increases. The low-temperature and low-pressure hot water injected into the heat exchange chamber III in the previous cycle of Mode III is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe is injected into the heat exchange chamber III.

[0014] Further, in the Mode III, the low-pressure balance valve III is opened, and the pressure in the heat exchange chamber III decreases. The high-temperature and high-pressure hot water injected into the heat exchange chamber III in Mode II reduces in pressure to become high-temperature and low-pressure hot water and is sent to the heat supply pipe. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber III. The high-pressure balance valve I is opened, and the pressure in the heat exchange chamber I increases. The low-temperature and low-pressure hot water injected into the heat exchange chamber I in Mode I is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe is injected into the heat exchange chamber I.

[0015] Advantages of the present invention:

[0016] The present invention provides a heating system based on pressure potential energy conversion. The heating system based on pressure potential energy conversion of the present invention utilizes the pressure difference between the primary pipe network and the secondary pipe network. After reducing the pressure of the high-pressure hot water in the primary pipe network, it is directly supplied to the secondary pipe network. At the same time, after increasing the pressure of the low-temperature and low-pressure hot water in the secondary pipe network, it is transported to the return pipe network of the primary pipe network for heating. In this way, the temperature difference between the supply and return water in the primary pipe network is increased, and the hot water heat exchange efficiency is improved. The present invention utilizes the pressure potential energy of the primary pipe network to boost the low-temperature and low-pressure hot water from the secondary pipe network, enabling the effective recovery of the pressure potential energy of the high-pressure hot water in the primary pipe network. As a result, the present invention does not require additional driving sources, effectively reducing the operating costs of the system and achieving the purpose of energy-saving operation. Brief Description of the Drawings

[0017] Figure 1 It is a schematic flow chart of the present invention. Detailed Embodiments

[0018] Figure 1This is a schematic flow diagram of the present invention. The arrows in the figure represent the flow direction of the medium in the system of the present invention.

[0019] A heating system based on pressure potential energy conversion includes a primary pipe network, a secondary pipe network, and a heat exchange device. The primary pipe network is used to introduce high-temperature and high-pressure hot water; the heat exchange device is used to receive the high-temperature and high-pressure hot water from the primary pipe network and reduce the pressure; the secondary pipe network is used to receive the high-temperature and low-pressure hot water after the pressure reduction by the heat exchange device and is used to heat the heating users. The high-temperature and high-pressure hot water from the primary pipe network pressurizes the low-temperature and low-pressure hot water after heating for the heating users in the secondary pipe network, then conveys and heats it, and circulates it back to the primary pipe network.

[0020] In this embodiment, the heat exchange device includes a heat exchange chamber I 5 and a heat exchange chamber II 6, and the heat exchange chamber I 5 and the heat exchange chamber II 6 do not simultaneously produce high-temperature and low-pressure hot water and low-temperature and high-pressure hot water. Not simultaneously producing high-temperature and low-pressure hot water and low-temperature and high-pressure hot water means that when the heat exchange chamber I 5 produces high-temperature and low-pressure hot water, the heat exchange chamber II 6 produces low-temperature and high-pressure hot water, and when the heat exchange chamber I 5 produces low-temperature and high-pressure hot water, the heat exchange chamber II 6 produces high-temperature and low-pressure hot water.

[0021] In this embodiment, it further includes a heat exchange chamber III 7. The heat exchange chamber III 7 is used to produce high-temperature and low-pressure hot water or low-temperature and high-pressure hot water. The heat exchange device has three operating modes: mode I, mode II, and mode III. In mode I, the heat exchange chamber I 5 produces and conveys high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber II 6 produces and conveys low-temperature and high-pressure hot water to the primary pipe network; in mode II, the heat exchange chamber II 6 produces and conveys high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber III 7 produces and conveys low-temperature and high-pressure hot water to the primary pipe network; in mode III, the heat exchange chamber III 7 produces and conveys high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber I 5 produces and conveys low-temperature and high-pressure hot water to the primary pipe network; the mode I, mode II, and mode III operate in sequence and cycle. The sequential cyclic operation of mode I, mode II, and mode III means that after mode I finishes operating, mode II operates, after mode II finishes operating, mode III operates, and after mode III finishes operating, mode I operates, so that mode I, mode II, and mode III form a working cycle, and the three cavities cycle alternately to ensure the smoothness and continuity of the high-temperature side cycle and the low-temperature side cycle, so as to achieve continuous heating.

[0022] In this embodiment, it further includes a high-pressure return water pipe 3 for recovering low-temperature high-pressure hot water. The primary pipe network has a high-pressure water supply pipe 1 for delivering high-temperature high-pressure hot water to the heat exchange device. The high-pressure water supply pipe 1 and the high-pressure return water pipe 3 are respectively connected to the heat exchange chamber I 5, the heat exchange chamber II 6, and the heat exchange chamber III 7. At the position where the high-pressure water supply pipe 1 is connected to the heat exchange chamber I 5, a high-pressure inlet valve 101 for controlling the entry of high-temperature high-pressure hot water into the heat exchange chamber I 5 is provided. At the position where the high-pressure water supply pipe 1 is connected to the heat exchange chamber II 6, a high-pressure inlet valve 102 for controlling the entry of high-temperature high-pressure hot water into the heat exchange chamber II 6 is provided. At the position where the high-pressure water supply pipe 1 is connected to the heat exchange chamber III 7, a high-pressure inlet valve 103 for controlling the entry of high-temperature high-pressure hot water into the heat exchange chamber III 7 is provided. At the position where the high-pressure return water pipe 3 is connected to the heat exchange chamber I 5, a high-pressure return water valve 301 for controlling the outflow of low-temperature high-pressure hot water from the heat exchange chamber I 5 to the high-pressure return water valve is provided. At the position where the high-pressure return water pipe 3 is connected to the heat exchange chamber II 6, a high-pressure return water valve 302 for controlling the outflow of low-temperature high-pressure hot water from the heat exchange chamber II 6 to the high-pressure return water valve is provided. At the position where the high-pressure return water pipe 3 is connected to the heat exchange chamber III 7, a high-pressure return water valve 303 for controlling the outflow of low-temperature high-pressure hot water from the heat exchange chamber III 7 to the high-pressure return water valve is provided. The high-pressure water supply pipe 1 and the high-pressure return water pipe 3 are respectively connected to a heat supply source such as a power station boiler. The high-temperature high-pressure hot water in the heat supply source enters the heat exchange system through the high-pressure water supply pipe 1, while the low-temperature high-pressure hot water returns to the heat supply source through the high-pressure return water pipe 3 to be heated into high-temperature high-pressure hot water again.

[0023] In this embodiment, the secondary pipe network has a low-pressure water supply pipe 2 for delivering low-temperature and low-pressure hot water to the heat exchange device and a heat supply pipe 4 for receiving high-temperature and low-pressure hot water. The low-pressure water supply pipe 2 and the heat supply pipe 4 are respectively connected to the heat exchange chamber I 5, the heat exchange chamber II 6, and the heat exchange chamber III 7. In this embodiment, at the position where the low-pressure water supply pipe 2 is connected to the heat exchange chamber I 5, a low-pressure inlet valve 201 for controlling the entry of low-temperature and low-pressure hot water into the heat exchange chamber I 5 is provided. At the position where the low-pressure water supply pipe 2 is connected to the heat exchange chamber II 6, a low-pressure inlet valve 202 for controlling the entry of low-temperature and low-pressure hot water into the heat exchange chamber II 6 is provided. At the position where the low-pressure water supply pipe 2 is connected to the heat exchange chamber III 7, a low-pressure inlet valve 203 for controlling the entry of low-temperature and low-pressure hot water into the heat exchange chamber III 7 is provided; at the position where the heat supply pipe 4 is connected to the heat exchange chamber I 5, a heating valve 401 for controlling the outflow of high-temperature and low-pressure hot water from the heat exchange chamber I 5 to the heating pipe is provided. At the position where the heat supply pipe 4 is connected to the heat exchange chamber II 6, a heating valve 402 for controlling the outflow of high-temperature and low-pressure hot water from the heat exchange chamber II 6 to the heating pipe is provided. At the position where the heat supply pipe 4 is connected to the heat exchange chamber III 7, a heating valve 403 for controlling the outflow of high-temperature and low-pressure hot water from the heat exchange chamber III 7 to the heating pipe is provided. The low-pressure inlet valves and the high-pressure return valves in this embodiment are all one-way valves. Under the action of pressure, the fluid can flow spontaneously in the set flow direction, while there are no special regulations for other valves, which can be electric valves or pneumatic valves, etc. For example, for the low-pressure inlet valve 201, when the heating valve 401 is opened and the high-temperature and low-pressure hot water flows out of the heat exchange chamber I 5, the low-temperature and low-pressure hot water spontaneously flows into the heat exchange chamber I 5 through the low-pressure inlet valve 201 under the action of the pressure difference; another example is the high-pressure return valve 301. When the high-pressure inlet valve 101 is opened, the low-temperature and high-pressure hot water in the heat exchange chamber I 5 spontaneously flows out of the heat exchange chamber I 5 through the high-pressure return valve 301 under the extrusion of the high-temperature and high-pressure hot water. Such a setting does not require an additional driving source, reducing the operating cost of the system. In this embodiment, when there is a corresponding action, the corresponding valve opens, and after the action ends, the corresponding valve closes. For example, when the high-temperature and low-pressure hot water in the heat exchange chamber I needs to flow into the heat supply pipe, the corresponding heating valve 401 is opened, and when the high-temperature and low-pressure hot water completely flows out of the heat exchange chamber I, the heating valve 401 is closed. This is understandable to those skilled in the art of this technology and will not be elaborated here.

[0024] In this embodiment, a pressure balance valve group is further included. The pressure balance valve group includes a high-pressure balance valve and a low-pressure balance valve. The high-pressure balance valve includes a high-pressure balance valve I 12, a high-pressure balance valve II 14, and a high-pressure balance valve III 16. The high-pressure balance valve I 12 is arranged at the position where the high-pressure water supply pipe 1 is connected to the heat exchange chamber I 5 for balancing the pressure between the high-pressure water supply pipe 1 and the heat exchange chamber I 5 to increase the water pressure in the heat exchange chamber I 5. The high-pressure balance valve II 14 is arranged at the position where the high-pressure water supply pipe 1 is connected to the heat exchange chamber II 6 for balancing the pressure between the high-pressure water supply pipe 1 and the heat exchange chamber I 5 to increase the water pressure in the heat exchange chamber I 5. The high-pressure balance valve III 16 is arranged at the position where the high-pressure water supply pipe 1 is connected to the heat exchange chamber III 7 for balancing the pressure between the high-pressure water supply pipe 1 and the heat exchange chamber III 7 to increase the water pressure in the heat exchange chamber I 5. The low-pressure balance valve includes a low-pressure balance valve I 13, a low-pressure balance valve II 15, and a low-pressure balance valve III 17. The low-pressure balance valve I 13 is arranged at the position where the heat supply pipe 4 is connected to the heat exchange chamber I 5 for balancing the pressure between the heat supply pipe 4 and the heat exchange chamber I 5 to reduce the water pressure in the heat exchange chamber I 5. The low-pressure balance valve II 15 is arranged at the position where the heat supply pipe 4 is connected to the heat exchange chamber II 6 for balancing the pressure between the heat supply pipe 4 and the heat exchange chamber I 5 to reduce the water pressure in the heat exchange chamber I 5. The low-pressure balance valve III 17 is arranged at the position where the heat supply pipe 4 is connected to the heat exchange chamber III 7 for balancing the pressure between the heat supply pipe 4 and the heat exchange chamber III 7 to reduce the water pressure in the heat exchange chamber I 5.

[0025] In this embodiment, a water mixer 10 is further included. The low-temperature and high-pressure hot water prepared by the heat exchange device flows into the water mixer 10, mixes with the low-temperature and low-pressure hot water in the secondary pipe network, and then flows out after temperature reduction for heating. A part of the low-temperature and low-pressure hot water in the secondary pipe network enters the heat exchange device, is boosted to low-temperature and high-pressure hot water, and then is sent to the primary pipe network for heating. The remaining part enters the water mixer 10, mixes with the high-temperature and low-pressure hot water, the temperature is reduced to a temperature suitable for heating, and then is sent to the user's 11 home for heating. The previous cycle means the working cycle of the previous mode I, mode II, and mode III. When the heating system based on pressure potential energy conversion is put into use for the first time, only the high-temperature and high-pressure hot water in the primary pipe network needs to be injected into the heat exchange chamber I 5, and the low-temperature and low-pressure hot water from the secondary pipe network is injected into the heat exchange chamber II 6 and the heat exchange chamber III 7, then the working cycle mentioned in the technical solution of the present invention can be started. This is a processing method that can be understood or is common for those skilled in the art, and will not be elaborated here.

[0026] In this embodiment, in Mode I, the high-temperature and high-pressure hot water injected by the high-pressure water supply pipe 1 in the previous cycle Mode III is stored in the heat exchange chamber I 5. The low-pressure balance valve I 13 is opened, and after the pressure in the heat exchange chamber I 5 decreases, the low-pressure balance valve I 13 is closed. The high-temperature and high-pressure hot water becomes high-temperature and low-pressure hot water and is sent to the heat supply pipe 4. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber I 5. The high-pressure balance valve II 14 is opened, the pressure in the heat exchange chamber II 6 increases, the low-temperature and low-pressure hot water injected into the heat exchange chamber II 6 in the previous cycle Mode II is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe 3. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe 1 is injected into the heat exchange chamber II 6.

[0027] In this embodiment, in Mode II, the low-pressure balance valve II 15 is opened, the pressure in the heat exchange chamber II 6 decreases, the pressure of the high-temperature and high-pressure hot water injected into the heat exchange chamber II 6 in Mode I decreases to high-temperature and low-pressure hot water and is sent to the heat supply pipe 4. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber II 6. The high-pressure balance valve III 16 is opened, the pressure in the heat exchange chamber III 7 increases, the low-temperature and low-pressure hot water injected into the heat exchange chamber III 7 in the previous cycle Mode III is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe 3. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe 1 is injected into the heat exchange chamber III 7.

[0028] In this embodiment, in Mode III, the low-pressure balance valve III 17 is opened, the pressure in the heat exchange chamber III 7 decreases, the pressure of the high-temperature and high-pressure hot water injected into the heat exchange chamber III 7 in Mode II decreases to high-temperature and low-pressure hot water and is sent to the heat supply pipe 4. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber III 7. The high-pressure balance valve I 12 is opened, the pressure in the heat exchange chamber I 5 increases, the low-temperature and low-pressure hot water injected into the heat exchange chamber I 5 in Mode I is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe 3. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe 1 is injected into the heat exchange chamber I 5.

[0029] In this embodiment, a secondary pipe network circulation pump 9 and a flow regulating valve 8 are also provided. The secondary pipe network circulation pump 9 is arranged on the side of the low-pressure water supply pipe 2 close to the user 11 so that the low-temperature and low-pressure hot water can flow smoothly into the heat exchange device or the water mixer 10. The flow regulating valve 8 is arranged on the side of the low-pressure water supply pipe 2 close to the heat exchange device and is used to regulate the flow rate of the low-temperature and low-pressure hot water entering the heat exchange device. By regulating the flow rate of the low-temperature and low-pressure hot water, the flow rate of the low-temperature and high-pressure hot water can be indirectly regulated. The flow rate of the low-temperature and high-pressure hot water affects the flow rate of the high-temperature and high-pressure hot water, and the flow rate of the high-temperature and high-pressure hot water in turn affects the temperature of the hot water finally used for heating. Therefore, the flow regulating valve 8 regulates the final heating temperature of the present invention by regulating the flow rate of the low-temperature and low-pressure hot water. The heat exchange chamber I 5, the heat exchange chamber II 6, the heat exchange chamber III 7 and the water mixer 10 in this embodiment are pressure-resistant water pipes with heat preservation functions. The hot water directly rises, reduces pressure or mixes and exchanges heat in the pipes. Such a design can reduce the operation cost and is also convenient for maintenance. Of course, a hybrid heat exchanger or other components with the same function can also be selected. This is a technical method that can be understood by those skilled in the art and will not be elaborated here.

[0030] In this embodiment, the district heating station usually uses a plate heat exchanger to transfer the heat on the primary side to the secondary pipe network. The supply and return water temperatures of the primary pipe network are usually 95°C and 65°C respectively; due to the popularization of floor heating, the supply and return water temperatures of the secondary pipe network are usually 58°C and 39°C respectively. After the high-temperature and high-pressure hot water in the primary pipe network is processed by the heat exchange device, it becomes high-temperature and low-pressure hot water. Due to certain losses, the temperature of the high-temperature hot water drops from 95°C to 94 - 94.5°C; after the low-temperature and low-pressure hot water in the secondary pipe network is processed by the heat exchange device, it becomes high-pressure and low-temperature water, and the temperature is about 40°C. It can be seen that the supply and return water temperatures of the primary side pipe network become 95°C and 40°C respectively. At this time, the supply and return water temperature difference of the primary pipe network changes from 30°C to 55°C. Then, under the same circulation flow rate, the supply and return water temperature difference of the primary network increases from 30°C to 55°C, and the heat carrying capacity increases by 83%. The heating area can be expanded by nearly 83%. For the existing pipe network, there is no need for new investment, which greatly reduces the investment cost of the heat network construction. For heating units such as centralized heating power plants, a lower return water temperature can improve the waste heat utilization rate of the power station and greatly improve the economic benefits.

[0031] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the purpose and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. A heating system based on pressure potential energy conversion, characterized in that: It includes a primary pipeline network, a secondary pipeline network and a heat exchange device. The primary pipeline network is used to introduce high-temperature and high-pressure hot water; the heat exchange device is used to receive the high-temperature and high-pressure hot water from the primary pipeline network and reduce the pressure; the secondary pipeline network is used to receive the high-temperature and low-pressure hot water after the pressure reduction by the heat exchange device and is used to heat the heating users; The high-temperature and high-pressure hot water from the primary pipeline network pressurizes the low-temperature and low-pressure hot water after heating for the heating by the secondary pipeline network, then conveys and heats it, and circulates it back to the primary pipeline network; The heat exchange device includes a heat exchange chamber Ⅰ and a heat exchange chamber Ⅱ, and the heat exchange chamber Ⅰ and the heat exchange chamber Ⅱ do not simultaneously produce high-temperature and low-pressure hot water and low-temperature and high-pressure hot water; It also includes a heat exchange chamber III, which is used to prepare high-temperature and low-pressure hot water or low-temperature and high-pressure hot water. The heat exchange device has three operating modes: Mode I, Mode II, and Mode III. In Mode I, the heat exchange chamber I prepares and transports high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber II prepares and transports low-temperature and high-pressure hot water to the primary pipe network; In Mode II, the heat exchange chamber II prepares and transports high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber III prepares and transports low-temperature and high-pressure hot water to the primary pipe network; In Mode III, the heat exchange chamber III prepares and transports high-temperature and low-pressure hot water to the secondary pipe network, and the heat exchange chamber I prepares and transports low-temperature and high-pressure hot water to the primary pipe network; The Mode I, Mode II, and Mode III operate in sequence in a cycle; In Mode I, there is high-temperature and high-pressure hot water injected from the high-pressure water supply pipe in the previous cycle's Mode III stored in the heat exchange chamber I. The low-pressure balance valve I is opened, and the pressure in the heat exchange chamber I decreases. The high-temperature and high-pressure hot water becomes high-temperature and low-pressure hot water and is sent to the heat supply pipe. At the same time, the low-temperature and low-pressure hot water enters the heat exchange chamber I; The high-pressure balance valve II is opened, and the pressure in the heat exchange chamber II increases. The low-temperature and low-pressure hot water injected into the heat exchange chamber II in the previous cycle's Mode II is boosted to low-temperature and high-pressure hot water and is sent to the high-pressure return pipe. At the same time, the high-temperature and high-pressure hot water in the high-pressure water supply pipe is injected into the heat exchange chamber II; It also includes a pressure balance valve group, and the pressure balance valve group includes a high-pressure balance valve and a low-pressure balance valve; The high-pressure balance valve includes a high-pressure balance valve I, a high-pressure balance valve II, and a high-pressure balance valve III. The high-pressure balance valve I is arranged at the position where the high-pressure water supply pipe is connected to the heat exchange chamber I to balance the pressure between the high-pressure water supply pipe and the heat exchange chamber I to increase the water pressure in the heat exchange chamber I. The high-pressure balance valve II is arranged at the position where the high-pressure water supply pipe is connected to the heat exchange chamber II to balance the pressure between the high-pressure water supply pipe and the heat exchange chamber I to increase the water pressure in the heat exchange chamber I. The high-pressure balance valve III is arranged at the position where the high-pressure water supply pipe is connected to the heat exchange chamber III to balance the pressure between the high-pressure water supply pipe and the heat exchange chamber III to increase the water pressure in the heat exchange chamber I; The low-pressure balance valve includes a low-pressure balance valve I, a low-pressure balance valve II, and a low-pressure balance valve III. The low-pressure balance valve I is arranged at the position where the heat supply pipe is connected to the heat exchange chamber I to balance the pressure between the heat supply pipe and the heat exchange chamber I to reduce the water pressure in the heat exchange chamber I. The low-pressure balance valve II is arranged at the position where the heat supply pipe is connected to the heat exchange chamber II to balance the pressure between the heat supply pipe and the heat exchange chamber I to reduce the water pressure in the heat exchange chamber I. The low-pressure balance valve III is arranged at the position where the heat supply pipe is connected to the heat exchange chamber III to balance the pressure between the heat supply pipe and the heat exchange chamber III to reduce the water pressure in the heat exchange chamber I.

2. The heating system based on pressure potential energy conversion according to claim 1, wherein: It also includes a high-pressure return pipe for recovering low-temperature and high-pressure hot water. The primary pipe network has a high-pressure water supply pipe for transporting high-temperature and high-pressure hot water to the heat exchange device. The high-pressure water supply pipe and the high-pressure return pipe are respectively connected to the heat exchange chamber I, the heat exchange chamber II, and the heat exchange chamber III.

3. The heating system based on pressure potential energy conversion according to claim 1, characterized in that: The secondary pipe network has a low-pressure water supply pipe for transporting low-temperature and low-pressure hot water to the heat exchange device and a heat supply pipe for receiving high-temperature and low-pressure hot water. The low-pressure water supply pipe and the heat supply pipe are respectively connected to the heat exchange chamber I, the heat exchange chamber II, and the heat exchange chamber III.

4. The heating system based on pressure potential energy conversion according to claim 1, wherein: It further includes a water mixer. The low-pressure high-temperature hot water prepared by the heat exchange device flows into the water mixer, mixes with the low-temperature low-pressure hot water in the secondary pipe network, cools down, and then flows out for heating.

5. The heating system based on pressure potential energy conversion according to claim 1, wherein: In the mode II, the low-pressure balance valve II is opened, the pressure in the heat exchange chamber II decreases, and the high-pressure high-temperature hot water injected into the heat exchange chamber II in the mode I is reduced to high-temperature low-pressure hot water and sent to the heat supply pipe. At the same time, the low-temperature low-pressure hot water enters the heat exchange chamber II. The high-pressure balance valve III is opened, the pressure in the heat exchange chamber III increases, and the low-temperature low-pressure hot water injected into the heat exchange chamber III in the previous cycle of the mode III is boosted to low-temperature high-pressure hot water and sent to the high-pressure return pipe. At the same time, the high-pressure high-temperature hot water in the high-pressure water supply pipe is injected into the heat exchange chamber III.

6. The heating system based on pressure potential energy conversion according to claim 5, wherein: In the mode III, the low-pressure balance valve III is opened, the pressure in the heat exchange chamber III decreases, and the high-pressure high-temperature hot water injected into the heat exchange chamber III in the mode II is reduced to high-temperature low-pressure hot water and sent to the heat supply pipe. At the same time, the low-temperature low-pressure hot water enters the heat exchange chamber III. The high-pressure balance valve I is opened, the pressure in the heat exchange chamber I increases, and the low-temperature low-pressure hot water injected into the heat exchange chamber I in the mode I is boosted to low-temperature high-pressure hot water and sent to the high-pressure return pipe. At the same time, the high-pressure high-temperature hot water in the high-pressure water supply pipe is injected into the heat exchange chamber I.

Images