Heat supply unit and heat supply system

Abstract

The application provides a heat supply unit and a heat supply system. The heat supply unit comprises a water supplement assembly, a heat exchanger and a water circulation assembly. The water supplement assembly comprises a water supplement tank and a water supplement pump, and the inlet end of the water supplement pump is communicated with the water outlet of the water supplement tank. The heat exchanger has a first heat exchange pipeline and a second heat exchange pipeline. The inlet end of the first heat exchange pipeline is communicated with a water supply pipe of a thermal power plant, the outlet end of the first heat exchange pipeline is communicated with a water return pipe of the thermal power plant, and the inlet end of the second heat exchange pipeline is communicated with the outlet end of the water supplement pump. The water circulation assembly comprises a first circulation pump and a second circulation pump which are arranged in parallel. In the early cold period and the late cold period, the second circulation pump with a smaller rated power is started, and in the severe cold period, the first circulation pump with a larger rated power is started. In this way, the first circulation pump and the second circulation pump can run in their respective optimal conditions, the energy utilization efficiency is higher, and running in the optimal condition also helps to prolong the service life of the circulation pump.

Description

Technical Field

[0001] This invention belongs to the technical field of heating equipment, specifically relating to a heating unit and a heating system. Background Technology

[0002] To ensure the normal lives of residents in cold winter regions, heating is necessary to keep indoor temperatures higher than outdoor temperatures. Urban heating systems mainly consist of heating units, heating pipes, and radiators. The heating units use heat energy from power plants to heat water in the heating network through heat exchangers, and then use circulating pumps to deliver the hot water to the radiators in the houses, where it is used to raise the temperature and provide warmth. Common types of radiators include underfloor heating, radiators, and fan coil units.

[0003] Depending on the ambient temperature, winter can be divided into the early cold period, the severe cold period, and the late cold period. The heating load required varies during these different periods, resulting in different water flow rates supplied by the circulating pumps of the heating units. Generally speaking, the heating load required is the highest during the severe cold period, and the load on the circulating pumps is also the highest. The heating load during the early and late cold periods is relatively small, about 60% of the heating load during the severe cold period, and the load on the circulating pumps is correspondingly reduced.

[0004] In existing technologies, heating units use a single circulating pump to supply hot water to the heating network. The circulating pump is selected based on the operating conditions under maximum load during the severe cold period. A single circulating pump cannot adapt to the changes in heating load during the early, severe, and late cold periods. During the early and late cold periods, the heating load is relatively small, which will cause the circulating pump to be unable to operate under the most suitable conditions. The energy utilization efficiency of the circulating pump is low, resulting in energy waste. Summary of the Invention

[0005] This invention provides a heating unit and heating system, aiming to solve the problem that the circulating pump of the existing heating unit cannot simultaneously match the changes in heating load during the early cold period, severe cold period and late cold period, and the energy utilization efficiency of the circulating pump is low.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows: In a first aspect, the present invention provides a heating unit, comprising: A water replenishment assembly includes a water replenishment tank and a water replenishment pump, wherein the inlet end of the water replenishment pump is connected to the outlet of the water replenishment tank; A heat exchanger includes a first heat exchange pipeline and a second heat exchange pipeline. The inlet end of the first heat exchange pipeline is connected to the power plant's water supply pipeline, and the outlet end of the first heat exchange pipeline is connected to the power plant's return water pipeline. The inlet end of the second heat exchange pipeline is connected to the outlet end of the makeup water pump. The water circulation assembly includes a first circulation pump and a second circulation pump connected in parallel. The inlet end of the first circulation pump and the inlet end of the second circulation pump are respectively connected to the outlet end of the second heat exchange pipeline, and the outlet end of the first circulation pump and the outlet end of the second circulation pump are respectively connected to the heating network.

[0007] In one possible implementation, the rated power of the second circulating pump is 60% of the rated power of the first circulating pump.

[0008] In one possible implementation, the water replenishment tank includes a tank body, the water outlet is provided on the side wall of the tank body, and the scale inhibitor addition port is provided on the top of the tank body; the water replenishment component includes a scale inhibitor addition component, which is located on the top of the tank body and is used to add scale inhibitor to the scale inhibitor addition port.

[0009] In one possible implementation, the scale inhibitor adding component includes: A storage tank is located at the top of the box body on a plane perpendicular to the vertical direction. The storage tank is offset from the scale inhibitor addition port. A discharge pipe is provided at the bottom of the storage tank, and the discharge pipe is equipped with a discharge valve. The first driving mechanism includes a rotating platform disposed on the top of the housing and a clamping unit disposed on the rotating platform. A measuring cup, disposed in the clamping unit, has a first position located below the discharge pipe and a second position located above the scale inhibitor addition port; and The controller is communicatively connected to the discharge valve and the rotary table, respectively.

[0010] In one possible implementation, the tank is connected to a water supply pipe, and a liquid flow meter is installed on the water supply pipe. The liquid flow meter is communicatively connected to the controller. The scale inhibitor addition component also includes a weighing device, which is located at the top of the tank and below the discharge pipe. The weighing device is communicatively connected to the controller.

[0011] In one possible implementation, the measuring cup includes: The cup body is an inverted frustum-shaped component, thicker at the top and thinner at the bottom, and has a through-flow space for holding material; and The base is housed within the material-containing space and is movably connected to the inner wall of the material-containing space. The base has an open state with the bottom opening of the material-containing space open and a closed state with the bottom opening of the material-containing space closed. The upper surface of the base is formed into a cone that is thicker at the bottom and thinner at the top.

[0012] In one possible implementation, the outer diameter of the base is smaller than the diameter of the opening at the bottom of the material-containing space, and in the closed state, the outer peripheral wall of the base overlaps the inner wall of the material-containing space. The scale inhibitor addition component further includes a feeding component, which includes: A discharge pusher is provided at the scale inhibitor inlet; the discharge pusher has a third position where it extends upward to push the base upward, and a fourth position where it retracts towards the scale inhibitor inlet; and The second drive mechanism, located in the housing, is used to drive the material discharge push rod to rise and fall, so that the material discharge push rod switches between the third position and the fourth position.

[0013] In one possible implementation, the clamping unit includes: A lifting cylinder is located on the rotary table; A bracket is connected to the lifting end of the lifting cylinder; A support ring, connected to the bracket, and fitted around the outer periphery of the cup body; and A limiting ring is connected to the bracket and is located above the cup body.

[0014] In one possible implementation, the housing has a water storage cavity, which is an inverted frustum-shaped cavity that is wider at the top and narrower at the bottom. The water outlet is provided on the side wall of the water storage cavity, and the drain outlet is provided on the bottom wall of the water storage cavity. The water replenishment component also includes a descaling component, which includes: The scraping frame includes a horizontally arranged connecting rod, two side scrapers respectively connected to both ends of the connecting rod, and a lower scraper connected to the bottom of the two side scrapers. The connecting rod, the two side scrapers and the lower scraper together form a trapezoidal frame structure that is wider at the top and narrower at the bottom. A third driving mechanism, connected to the connecting rod, is used to drive the scraper frame to rise and fall, switching the scraper frame between a fifth position and a sixth position. When the scraper frame is in the fifth position, the lower scraper is in contact with the bottom wall of the water storage cavity, and the two side scrapers are in contact with the side walls of the water storage cavity respectively. When the scraper frame is in the sixth position, neither the lower scraper nor the side scrapers are in contact with the inner wall of the water storage cavity. A fourth drive mechanism is located in the housing and connected to the third drive mechanism, used to drive the third drive mechanism and the scraper frame to rotate together around a vertical axis.

[0015] In one possible implementation, the water replenishment assembly further includes a filter disposed at the water outlet, the inlet end of the filter being connected to the water outlet, and the outlet end of the filter being connected to the inlet end of the water replenishment pump.

[0016] Compared with the prior art, the beneficial effects of the heating unit provided by the present invention are: The heating unit provided by this invention includes a water supply component, a heat exchanger, and a water circulation component. The heat exchanger uses thermal energy from a power plant to heat the circulating water in the heating network. The water supply component includes a water supply tank and a water supply pump, used to replenish water to the circulating pipeline of the heating network. The water circulation component is used to realize the water circulation of the heating network, transporting hot water from the heat exchanger to user homes and transporting cooling water from user homes back to the heat exchanger for reheating. The water circulation component includes a first circulation pump and a second circulation pump. The first and second circulation pumps can be selected with different rated power models to adapt to the workload of different heating stages. During the early and late cold periods, the second circulation pump with a smaller rated power is started, while during the severe cold period, the first circulation pump with a larger rated power is activated. This configuration ensures that both the first and second circulation pumps operate within their respective optimal operating conditions, resulting in higher energy efficiency. Furthermore, operating within optimal conditions also helps extend the service life of the circulation pumps.

[0017] In a second aspect, the present invention provides a heating system, comprising: As described in any of the above implementations, the rated power of the first circulating pump is greater than that of the second circulating pump; and An ambient temperature detection module, located outdoors, is used to monitor the ambient temperature. The ambient temperature detection module is communicatively connected to the first circulating pump and the second circulating pump, respectively. When the ambient temperature detection module detects that the ambient temperature is higher than the preset value, it controls the second circulation pump to start working and the first circulation pump to stop working. When the ambient temperature detection module detects that the ambient temperature is lower than the preset value, it controls the first circulation pump to start working and the second circulation pump to stop working.

[0018] The heating system provided by the present invention uses a heating unit in any of the above implementation methods. It monitors the ambient temperature through an ambient temperature detection module. When the temperature reaches a preset value, it can automatically start the high-power first circulation pump to achieve frequency conversion control. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the working principle of a heating unit provided in one embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of a heating unit provided in one embodiment of the present invention; Figure 3 This is a schematic diagram of the heating unit from another angle, according to one embodiment of the present invention. Figure 4 This is a schematic diagram of the structure of the water replenishment component in one embodiment of the present invention; Figure 5 This is an internal cross-sectional view of the water replenishment component in one embodiment of the present invention; Figure 6 for Figure 5 A cross-sectional view along the AA direction; Figure 7 This is a schematic diagram of the descaling component in one embodiment of the present invention; Figure 8 This is a schematic diagram of the filter structure in one embodiment of the present invention; Figure 9 This is a partial structural diagram of the measuring cup in the first position in one embodiment of the present invention; Figure 10 This is a partial structural diagram of the measuring cup in the second position in one embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of the material feeding component installed at the scale inhibitor addition port in one embodiment of the present invention; Figure 12 This is a schematic diagram showing the cooperation of the clamping component, measuring cup, and discharge pusher in one embodiment of the present invention.

[0020] Explanation of reference numerals in the attached figures: 1. Hydration components; 10. Water supply tank; 11. Water outlet; 12. Scale inhibitor addition port; 13. Water supply pipe; 14. Liquid flow meter; 15. Sewage outlet; 20. Scale inhibitor addition assembly; 21. Storage bin; 22. First drive mechanism; 221. Rotary table; 222. Lifting cylinder; 223. Bracket; 224. Support ring; 225. Limiting ring; 23. Measuring cup; 231. Cup body; 232. Base support; 24. Weighing device; 25. Discharge assembly; 251. Discharge push rod; 252. Second drive mechanism; 30. Descaling assembly; 31. Scraper frame; 311. Connecting rod; 312. Side scraper; 313. Lower scraper; 32. Third drive mechanism; 33. Fourth drive mechanism; 40. Filter; 41. First branch pipe; 42. Second branch pipe; 43. Control valve; 44. Filter unit; 50. Water supply pump; 2. Heat exchanger; 201. First heat exchange pipeline; 202. Second heat exchange pipeline; 3. Water circulation assembly; 301. First circulation pump; 302. Second circulation pump. Detailed Implementation

[0021] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0022] It should be noted that when an element is referred to as "fixed to," "fixed," or "attached" to another element, it can be directly on the other element or may have an intervening element. When an element is referred to as "connected to" or "connected to" another element, it can be directly connected to the other element or may have an intervening element. When an element is referred to as "set on" or "located on" another element, it can be directly on the other element or may have an intervening element. "Multiple" refers to two or more items. "At least one" refers to one or more items. "Several" refers to one or more items.

[0023] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0024] Please refer to the following: Figures 1 to 12 The heating unit and heating system provided in the embodiments of the present invention will be described below.

[0025] Please see Figures 1 to 3 In a first aspect, embodiments of the present invention provide a heating unit, including a water supply component 1, a heat exchanger 2, and a water circulation component 3. The water supply component 1 includes a water supply tank 10 and a water supply pump 50, with the inlet end of the water supply pump 50 connected to the outlet 11 of the water supply tank 10. The heat exchanger 2 has a first heat exchange pipeline 201 and a second heat exchange pipeline 202. The inlet end of the first heat exchange pipeline 201 is connected to the power plant's water supply pipeline, and the outlet end of the first heat exchange pipeline 201 is connected to the power plant's return water pipeline. The inlet end of the second heat exchange pipeline 202 is connected to the outlet end of the water supply pump 50. The water circulation component 3 includes a first circulation pump 301 and a second circulation pump 302 connected in parallel. The inlet ends of the first circulation pump 301 and the second circulation pump 302 are respectively connected to the outlet end of the second heat exchange pipeline 202, and the outlet ends of the first circulation pump 301 and the second circulation pump 302 are respectively connected to the heating network.

[0026] Compared with the prior art, the beneficial effects of the heating unit provided in the embodiments of the present invention are: The heating unit provided in this embodiment of the invention includes a water supply component 1, a heat exchanger 2, and a water circulation component 3. The heat exchanger 2 uses thermal energy from a thermal power plant to heat the circulating water in the heating network. The water supply component 1 includes a water supply tank 10 and a water supply pump 50, used to replenish water to the circulating pipeline of the heating network. The water circulation component 3 is used to realize the water circulation of the heating network, transporting the hot water in the heat exchanger 2 to the user's house, and transporting the cooling water in the user's house to the heat exchanger 2 for reheating. The water circulation component 3 includes a first circulation pump 301 and a second circulation pump 302. The first circulation pump 301 and the second circulation pump 302 can be selected with different rated power to adapt to the working load of different heating stages. During the early and late cold periods, the second circulation pump 302 with a smaller rated power is started, while during the severe cold period, the first circulation pump 301 with a larger rated power is activated. This setting ensures that both the first circulation pump 301 and the second circulation pump 302 can operate within their respective optimal operating conditions, resulting in higher energy utilization efficiency. Furthermore, operating within optimal operating conditions also helps to extend the service life of the circulation pumps.

[0027] Since water loss occurs in the heating network during the heating season, the heating unit in this embodiment of the invention includes a water replenishment component 1. When the water in the heating network decreases, the water replenishment pump 50 can be started to add water from the water replenishment tank 10 to the second heat exchange pipeline 202. After being heated by the heat exchanger 2, the water enters the heating network, completing the water replenishment operation.

[0028] It should be noted that, due to the small internal clearances of the pipe valves and heat exchanger 2, the water in the makeup water tank 10 should undergo scale inhibition treatment to prevent scale buildup and pipe blockage caused by newly added water. Scale inhibition can be achieved by adding a scale inhibitor to the makeup water tank 10. The scale inhibitor disperses sparingly soluble inorganic salts in the water, preventing or interfering with their precipitation and scaling on metal surfaces, thus maintaining good heat transfer performance of the metal equipment. Commercially available scale inhibitors can be used, including both solid and liquid forms.

[0029] Heat exchanger 2 is used to achieve heat exchange, using hot water or steam from the thermal power plant to heat the water in the heating network. Heat exchanger 2 can be a plate heat exchanger 2, a shell and tube heat exchanger 2, etc. When the heat exchanger 2 is working, the hot water generated by the heat exchanger 2 is transported to the user's house through the water circulation component 3, and the cooling water of the user's house is transported to the heat exchanger 2 for reheating.

[0030] In some possible embodiments, the rated power of the second circulation pump 302 is 60% of the rated power of the first circulation pump 301. The first circulation pump 301 is started during the severe cold period, and the second circulation pump 302 is started during the early and late cold periods, so that both the first circulation pump 301 and the second circulation pump 302 can operate within their respective optimal operating conditions.

[0031] Please see Figures 4 to 6 In some possible embodiments, the water replenishment tank 10 includes a tank body, with a water outlet 11 on the side wall of the tank body and a scale inhibitor addition port 12 on the top of the tank body; the water replenishment component 1 also includes a scale inhibitor addition component 20, which is located on the top of the tank body and is used to add scale inhibitor to the scale inhibitor addition port 12.

[0032] In this embodiment, the scale inhibitor adding component 20 is used to add scale inhibitor to the water supply tank 10. The amount of scale inhibitor added can be selected according to the volume of water in the water supply tank 10. Liquid or solid scale inhibitors can be used. The scale inhibitor adding port 12 can be a normally open port or it can be equipped with an openable and closable valve plate. During normal use, the valve plate closes the scale inhibitor adding port 12. When scale inhibitor needs to be added, the valve is moved to open the scale inhibitor adding port 12.

[0033] Please see Figure 4 , Figure 5 , Figure 9 and Figure 10 In some possible embodiments, the scale inhibitor addition assembly 20 includes a storage tank 21, a first drive mechanism 22, a measuring cup 23, and a controller. The storage tank 21 is located at the top of the housing and is offset from the scale inhibitor addition port 12 on a plane perpendicular to the vertical direction. A discharge pipe with a discharge valve is provided at the bottom of the storage tank 21. The first drive mechanism 22 includes a rotating platform 221 located at the top of the housing and a clamping unit located on the rotating platform 221. The measuring cup 23 is located on the clamping unit and has a first position below the discharge pipe and a second position above the scale inhibitor addition port 12. The controller is communicatively connected to the discharge valve and the rotating platform 221.

[0034] In this embodiment, the scale inhibitor addition component 20 includes a storage tank 21, a first drive mechanism 22, a measuring cup 23, and a controller. The storage tank 21 is used to store solid or liquid scale inhibitors. The first drive mechanism 22 is used to drive the measuring cup 23 to switch between a first position and a second position. When the measuring cup 23 is in the first position, the discharge valve of the storage tank 21 is opened, allowing the scale inhibitor to fall from the discharge pipe into the measuring cup 23 below. After the measuring cup 23 has received the scale inhibitor, the first drive mechanism 22 drives the measuring cup 23 carrying the scale inhibitor to move to the second position. At this time, the measuring cup 23 is located above the scale inhibitor addition port 12. The first drive mechanism 22 drives the measuring cup 23 to flip, allowing the scale inhibitor to be poured into the water replenishment tank 10. The measuring cup 23 can be a stainless steel cup, a plastic cup, a glass cup, a paper cup, etc.

[0035] The controller is used to control the actions of mechanical structures such as the discharge valve and the first drive mechanism 22. The discharge valve can be an electric valve such as a star-shaped ash discharge valve, a slide gate valve, or a ball valve. The first drive mechanism 22 can be a mechanical device such as a robotic arm that can grip and drive the measuring cup 23 to move.

[0036] Please see Figure 4 and Figure 5 In some possible embodiments, the tank is connected to a water supply pipe 13, and a liquid flow meter 14 is provided on the water supply pipe 13. The liquid flow meter 14 is connected to the controller. The scale inhibitor addition component 20 also includes a weighing device 24, which is located on the top of the tank and below the discharge pipe. The weighing device 24 is connected to the controller.

[0037] In this embodiment, the water supply pipe 13 is connected to the return water pipe in the water source or heating network, allowing water to be added to the tank. The water in the water supply tank 10 is descaled before being transported to the heat exchanger 2 to prevent scale buildup inside the heat exchanger 2. A liquid flow meter 14 is installed on the water supply pipe 13 to measure the volume of the added water. The liquid flow meter 14 sends the volume of the added water to the controller, which can then control the scale inhibitor addition component 20 to weigh an appropriate amount of scale inhibitor based on the volume of the newly added water and add it to the water supply tank 10. It should be noted that when the amount of scale inhibitor added is large and exceeds the capacity of the measuring cup 23, it can be added in multiple batches.

[0038] The weighing device 24 is an electronic weighing device. During use, the first drive mechanism 22 places the measuring cup 23 on the weighing device 24, the discharge valve opens, and the scale inhibitor falls into the measuring cup 23. When the weighing device 24 detects that the weight of the scale inhibitor has reached the required level, it sends a signal to the controller, which then controls the discharge valve to close. Then, the first drive mechanism 22 moves the measuring cup 23 to a second position, pouring the scale inhibitor into the water replenishment tank 10.

[0039] Please see Figure 12 In some possible embodiments, the measuring cup 23 includes a cup body 231 and a base 232. The cup body 231 is an inverted frustum-shaped component that is thicker at the top and thinner at the bottom, and has a material-containing space that runs through the top and bottom. The base 232 is housed in the material-containing space and is movably connected to the inner wall of the material-containing space. The base 232 has an open state with the bottom opening of the material-containing space open and a closed state with the bottom opening of the material-containing space closed. The upper surface of the base 232 is formed into a cone that is thicker at the bottom and thinner at the top.

[0040] In this embodiment, the measuring cup 23 includes a cup body 231 and a base 232 that are movably connected. The base 232 and the inner wall of the cup body 231 can be connected by snap-fit, magnetic adsorption, or other methods. The cup body 231 and the base 232 can be connected as a single unit to hold the descaling agent, and the base 232 can also be separated from the cup body 231 to allow the descaling agent to fall out. When the measuring cup 23 moves to the second position, the base 232 can be pushed upward using a cylinder, electric push rod, etc., to separate the base 232 from the cup body 231, allowing the descaling agent to fall out through the gap between the base 232 and the cup body 231. After all the descaling agent has fallen out, the cylinder or electric push rod retracts, and the base 232 falls back onto the bottom wall of the holding space. The cup body 231 is in the shape of an inverted frustum, which facilitates clamping by the first drive mechanism 22. The material holding space is also in the shape of an inverted frustum, and the upper surface of the base 232 has a cone, which facilitates the scale inhibitor to slide down along the cone surface and prevents the scale inhibitor from remaining in the measuring cup 23.

[0041] Please see Figures 9 to 11 In some possible embodiments, the outer diameter of the base 232 is smaller than the aperture of the bottom opening of the material holding space. In the closed state, the outer peripheral wall of the base 232 overlaps with the inner wall of the material holding space. The scale inhibitor adding assembly 20 also includes a discharging assembly 25, which includes a discharging push rod 251 and a second driving mechanism 252. The discharging push rod 251 is located at the scale inhibitor adding port 12 and has a third position in which it extends upward to push the base 232 upward, and a fourth position in which it retracts towards the scale inhibitor adding port 12. The second driving mechanism 252 is located in the housing and is used to drive the discharging push rod 251 to move up and down, so that the discharging push rod 251 switches between the third position and the fourth position.

[0042] In this embodiment, the scale inhibitor adding component 20 also includes a dispensing component 25. When the measuring cup 23 moves to the second position, the dispensing push rod 251 extends upward to the third position, lifting the base 232 and causing the scale inhibitor to fall into the scale inhibitor adding port 12. After the scale inhibitor is added, the dispensing push rod 251 retracts to the fourth position to reset. The second driving mechanism 252 can be a cylinder, an electric telescopic rod, etc.

[0043] Please see Figures 9 to 12 In some possible embodiments, the clamping unit includes a lifting cylinder 222, a bracket 223, a supporting ring 224, and a limiting ring 225. The lifting cylinder 222 is disposed on the rotary table 221; the bracket 223 is connected to the lifting end of the lifting cylinder 222; the supporting ring 224 is connected to the bracket 223 and is sleeved on the outer periphery of the cup body 231; the limiting ring 225 is connected to the bracket 223 and is disposed above the cup body 231.

[0044] In this embodiment, the clamping unit includes a lifting cylinder 222, a bracket 223, a supporting ring 224, and a limiting ring 225. The lifting cylinder 222 is mounted on a rotating platform 221 and can rotate with the platform. One end of the bracket 223 is fixedly mounted on the lifting end of the lifting cylinder 222, and the other end is connected to the supporting ring 224 and the limiting ring 225. The supporting ring 224 is fitted around the outer periphery of the cup body 231 and can hold the inverted frustum-shaped cup body 231. The limiting ring 225 is located above the cup body 231 and extends beyond the upper edge of the cup body 231 by a predetermined distance (e.g., 5-10mm). When the material discharge push rod 251 pushes the base 232 upward, the limiting ring 225 is used to limit the cup body 231 to prevent it from being pushed too high.

[0045] The lifting cylinder 222 is used to lift the bracket 223 and the support ring 224. When it is necessary to transfer the measuring cup 23, the lifting cylinder 222 rises, and the support ring 224 can lift the measuring cup 23. When it is necessary to place the measuring cup 23 on the weighing device 24, the lifting cylinder 222 descends an appropriate distance, so that the measuring cup 23 falls onto the weighing platform. At this time, the support ring 224 does not contact the cup body 231 and will not interfere with the weighing of the scale inhibitor.

[0046] Please see Figures 5 to 7 In some possible embodiments, the housing has a water storage cavity, which is an inverted frustum-shaped cavity that is wider at the top and narrower at the bottom. The water storage cavity has an outlet 11 on its side wall and a drain outlet 15 on its bottom wall. The water replenishment component 1 also includes a descaling component 30, which includes a scraping frame 31, a third drive mechanism 32 and a fourth drive mechanism 33. The scraping frame 31 includes a horizontally arranged connecting rod 311, two side scrapers 312 respectively connected to both ends of the connecting rod 311, and a lower scraper 313 connected to the bottom of the two side scrapers 312. The connecting rod 311, the two side scrapers 312 and the lower scraper 313 together form a trapezoidal frame structure that is wider at the top and narrower at the bottom. The third drive mechanism 32 is connected to the connecting rod 311 and is used to drive the scraping frame 31 to rise and fall, so that the scraping frame 31 switches between the fifth position and the sixth position. When the scraping frame 31 is in the fifth position, the lower scraper 313 is in contact with the bottom wall of the water storage cavity, and the two side scrapers 312 are in contact with the side walls of the water storage cavity. When the scraping frame 31 is in the sixth position, neither the lower scraper 313 nor the side scrapers 312 are in contact with the inner wall of the water storage cavity. The fourth drive mechanism 33 is located in the housing and is connected to the third drive mechanism 32, and is used to drive the third drive mechanism 32 and the scraping frame 31 to rotate together around the vertical axis.

[0047] Scale inhibitors can alleviate scale formation to some extent, but their effectiveness is not 100% due to limitations in product performance, application time, and dosage. Therefore, during heating shutdowns, the water supply tank 10 needs to be cleaned to remove scale buildup from its inner walls.

[0048] In this embodiment, the water replenishment component 1 also includes a descaling component 30. The descaling component 30 includes a rotatable scraper frame 31, which is raised and lowered by a third drive mechanism 32 and rotated by a fourth drive mechanism 33. When in the fifth position, the lower scraper 313 is in contact with the bottom wall of the water storage chamber, and the two side scrapers 312 are in contact with the side walls of the water storage chamber. The rotation of the scraper frame 31 can scrape off the scale on the inner wall of the water replenishment tank 10. The scraped scale falls to the bottom of the water storage chamber and can be discharged through the drain port 15. When in the sixth position, the third drive mechanism 32 drives the scraper frame 31 to rise. The scraper frame 31 does not contact the inner wall of the water replenishment tank 10. The rotation of the scraper frame 31 can stir the water and make the scale inhibitor evenly mixed.

[0049] The descaling component 30 provided in this embodiment includes a scraping frame 31, a third drive mechanism 32, and a fourth drive mechanism 33. Combined with the inverted frustum shape of the water storage chamber (wider at the top and narrower at the bottom), it can act as a stirrer during heating season, promoting uniform mixing of the scale inhibitor. During periods of heating shutdown and maintenance, it can also scrape away scale adhering to the side and bottom walls of the water storage chamber, achieving two goals at once. The third drive mechanism 32 can be a vertically arranged hydraulic cylinder, pneumatic cylinder, electric telescopic rod, etc., and the fourth drive mechanism 33 can be a motor, hydraulic rotary motor, or other power device.

[0050] Please see Figure 8 In some possible embodiments, the water replenishment assembly 1 further includes a filter 40 disposed at the outlet 11, with the inlet end of the filter 40 connected to the outlet 11 and the outlet end of the filter 40 connected to the inlet end of the water replenishment pump 50. The filter 40 is disposed at the outlet 11 of the water replenishment tank 10, which can filter again to prevent impurities from entering the heat exchanger 2 and causing blockage of the heat exchanger 2.

[0051] Please see Figure 8 In some possible embodiments, the filter 40 includes a first branch pipe 41 and a second branch pipe 42 arranged in parallel. Filter units 44 are detachably installed on both the first branch pipe 41 and the second branch pipe 42. Control valves 43 are respectively provided at both ends of the filter unit 44.

[0052] In use, the control valve 43 of the first branch pipe 41 is opened, and the second branch pipe 42 is reserved. When the filter unit 44 of the first branch pipe 41 needs to be cleaned, the control valve 43 on the second branch pipe 42 is opened to make the pipeline of the second branch pipe 42 unobstructed. Then, the two control valves 43 on the first branch pipe 41 are closed, the filter unit 44 is removed for cleaning or replacement, and then it is installed and fixed.

[0053] In a second aspect, embodiments of the present invention provide a heating system, including a heating unit as described in any of the above embodiments, wherein the rated power of a first circulating pump 301 is greater than that of a second circulating pump 302; and an ambient temperature detection module, located outdoors, for monitoring ambient temperature, wherein the ambient temperature detection module is communicatively connected to the first circulating pump 301 and the second circulating pump 302 respectively; when the ambient temperature detection module detects that the ambient temperature is higher than a preset value, it controls the second circulating pump 302 to start working and the first circulating pump 301 to stop working; when the ambient temperature detection module detects that the ambient temperature is lower than the preset value, it controls the first circulating pump 301 to start working and the second circulating pump 302 to stop working.

[0054] Winter heating is a high-energy-consuming industry. Therefore, it is inevitable for heating companies to adopt various energy-saving and consumption-reducing methods. The heating system provided in this embodiment of the invention uses the heating unit in any of the above embodiments. The ambient temperature is monitored by the ambient temperature detection module. When the temperature reaches the preset value, the high-power first circulation pump can be started automatically to achieve variable frequency control. This helps to keep the circulation pump running under the best operating conditions, resulting in higher energy utilization efficiency. Furthermore, operating under the best operating conditions also helps to extend the service life of the circulation pump.

[0055] With the development of technology, many new technologies have emerged in the heating industry, such as distributed frequency conversion technology, direct-buried uncompensated technology, water pump mixing and pressurization technology, and IoT balancing valve technology. The application of these new technologies helps reduce energy consumption in centralized heating network systems and improve heating efficiency.

[0056] The following is a brief introduction to some new technologies in this field. Heating companies may apply them as appropriate according to their own actual situation. The embodiments of this invention do not limit these technologies.

[0057] Distributed variable frequency drive (VFD) technology is a technique for centrally optimizing and distributing the water circulation power in a centralized heating network system. Its fundamental characteristic is that it breaks down the traditional centralized large circulation pump, which includes the heat source and primary network, into multiple return water booster pumps equipped with variable frequency controllers, installed on the return water side of the primary network at each heat exchange station. Heating network systems employing distributed VFD technology substantially transform traditional heating network systems into flexible ones. By adjusting the operating flow rate of each heat exchange station through VFD pumps, the safety issues associated with large fluctuations in heating pipeline pressure are avoided. Balancing and regulating the primary heat network becomes simple and easy, resulting in significant savings in both thermal and electrical energy.

[0058] Direct-buried, uncompensated heating pipelines are laid directly underground. The insulation material for the insulated pipes is polyurethane. Since the thermal conductivity of polyurethane is much lower than that of rock wool, its insulation performance is better than that of overhead pipelines. Furthermore, direct-buried, uncompensated pipelines reduce the need for auxiliary equipment such as compensators, thereby reducing pipeline heat loss.

[0059] Mixed-water heating systems are suitable for different buildings within the same heat exchange station, where different heating methods are used indoors, such as the coexistence of radiant floor heating and radiant floor heating. Mixed-water heating technology can completely solve the heat balance problem between different heating methods. Because the mixing lowers the floor temperature, it achieves a reasonable temperature field and reduces heat consumption.

[0060] The Internet of Things (IoT) balancing valve technology is mainly used in district heating secondary network systems. It is generally installed at the unit inlet, in front of the building, or on the return water pipe in the building riser. By using feedback on the return water temperature or the temperature difference between the supply and return water, the valve opening is changed to adjust the flow rate of the branch pipes, ultimately achieving hydraulic and thermal balance of the entire network.

[0061] It is understood that the parts in the above embodiments can be freely combined or deleted to form different combined embodiments. The specific contents of each combined embodiment will not be repeated here. After this description, it can be considered that the present invention specification has recorded each combined embodiment and can support different combined embodiments.

[0062] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A heating unit, characterized in that, include: A water replenishment assembly includes a water replenishment tank and a water replenishment pump, wherein the inlet end of the water replenishment pump is connected to the outlet of the water replenishment tank; A heat exchanger includes a first heat exchange pipeline and a second heat exchange pipeline. The inlet end of the first heat exchange pipeline is connected to the power plant's water supply pipeline, and the outlet end of the first heat exchange pipeline is connected to the power plant's return water pipeline. The inlet end of the second heat exchange pipeline is connected to the outlet end of the makeup water pump. The water circulation component includes a first circulation pump and a second circulation pump arranged in parallel. The inlet end of the first circulation pump and the inlet end of the second circulation pump are respectively connected to the outlet end of the second heat exchange pipeline, and the outlet end of the first circulation pump and the outlet end of the second circulation pump are respectively connected to the heating network. The water replenishment tank includes a tank body, the water outlet is provided on the side wall of the tank body, and the scale inhibitor addition port is provided on the top of the tank body; the water replenishment component also includes a scale inhibitor addition component, which is located on the top of the tank body and is used to add scale inhibitor to the scale inhibitor addition port. The housing has a water storage cavity, which is an inverted frustum-shaped cavity that is wider at the top and narrower at the bottom. The water outlet is provided on the side wall of the water storage cavity, and the drain outlet is provided on the bottom wall of the water storage cavity. The water replenishment component also includes a descaling component, which is located inside the housing and is used to scrape off the scale on the inner wall of the water storage cavity. The descaling component includes: The scraping frame includes a horizontally arranged connecting rod, two side scrapers respectively connected to both ends of the connecting rod, and a lower scraper connected to the bottom of the two side scrapers. The connecting rod, the two side scrapers and the lower scraper together form a trapezoidal frame structure that is wider at the top and narrower at the bottom. A third driving mechanism, connected to the connecting rod, is used to drive the scraper frame to rise and fall, so that the scraper frame switches between a fifth position and a sixth position. When the scraper frame is in the fifth position, the lower scraper is in contact with the bottom wall of the water storage cavity, and the two side scrapers are in contact with the side walls of the water storage cavity respectively. When the scraper frame is in the sixth position, neither the lower scraper nor the side scrapers are in contact with the inner wall of the water storage cavity. A fourth drive mechanism is located in the housing and connected to the third drive mechanism, used to drive the third drive mechanism and the scraper frame to rotate together around a vertical axis.

2. The heating unit according to claim 1, characterized in that, The scale inhibitor addition component includes: A storage tank is located at the top of the box body on a plane perpendicular to the vertical direction. The storage tank is offset from the scale inhibitor addition port. A discharge pipe is provided at the bottom of the storage tank, and the discharge pipe is equipped with a discharge valve. The first driving mechanism includes a rotating platform disposed on the top of the housing and a clamping unit disposed on the rotating platform. A measuring cup, disposed in the clamping unit, has a first position located below the discharge pipe and a second position located above the scale inhibitor addition port; and The controller is communicatively connected to the discharge valve and the rotary table, respectively.

3. The heating unit according to claim 2, characterized in that, The tank is connected to a water supply pipe, and a liquid flow meter is installed on the water supply pipe. The liquid flow meter is communicatively connected to the controller. The scale inhibitor addition component also includes a weighing device, which is located on the top of the tank and below the discharge pipe. The weighing device is communicatively connected to the controller.

4. The heating unit according to claim 3, characterized in that, The measuring cup includes: The cup body is an inverted frustum-shaped component, thicker at the top and thinner at the bottom, and has a through-flow space for holding material; and The base is housed within the material-containing space and is movably connected to the inner wall of the material-containing space. The base has an open state with the bottom opening of the material-containing space open and a closed state with the bottom opening of the material-containing space closed. The upper surface of the base is formed into a cone that is thicker at the bottom and thinner at the top.

5. The heating unit according to claim 4, characterized in that, The outer diameter of the base is smaller than the diameter of the opening at the bottom of the material-containing space. In the closed state, the outer peripheral wall of the base overlaps and abuts against the inner wall of the material-containing space. The scale inhibitor addition component further includes a feeding component, which includes: A discharge pusher is provided at the scale inhibitor addition port. The discharge pusher has a third position in which it extends upward to push the base upward, and a fourth position in which it retracts towards the scale inhibitor addition port. as well as The second drive mechanism, located in the housing, is used to drive the material discharge push rod to rise and fall, so that the material discharge push rod switches between the third position and the fourth position.

6. The heating unit according to claim 4, characterized in that, The clamping unit includes: A lifting cylinder is located on the rotary table; A bracket is connected to the lifting end of the lifting cylinder; A support ring, connected to the bracket, and fitted onto the bottom of the cup body; and A limiting ring is connected to the bracket and is located above the cup body.

7. The heating unit according to claim 1, characterized in that, The water replenishment assembly also includes a filter disposed at the water outlet, wherein the inlet end of the filter is connected to the water outlet and the outlet end of the filter is connected to the inlet end of the water replenishment pump.

8. A heating system, characterized in that, include: The heating unit as described in any one of claims 1-7, wherein the rated power of the first circulating pump is greater than that of the second circulating pump; as well as An ambient temperature detection module, located outdoors, is used to monitor the ambient temperature. The ambient temperature detection module is communicatively connected to the first circulating pump and the second circulating pump, respectively. When the ambient temperature detection module detects that the ambient temperature is higher than the preset value, it controls the second circulation pump to start working and the first circulation pump to stop working. When the ambient temperature detection module detects that the ambient temperature is lower than the preset value, it controls the first circulation pump to start working and the second circulation pump to stop working.

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