Heat supply network large-temperature-difference waste heat supply system based on embedded pipe heat shielding building temperature control technology

Abstract

A heat supply network large-temperature-difference waste heat supply system based on the embedded pipe heat shielding building temperature control technology is composed of a conventional high-temperature heat source, a conventional tail end heat user, a low-grade industrial waste heat source and an embedded pipe heat shielding low-carbon building heat user, water supplied by the conventional high-temperature heat source bears the conventional tail end heat supply requirement, and heat network return water of the conventional high-temperature heat source is mixed with water supplied by the low-grade industrial waste heat source; and the heat supply requirements of low-carbon building heat consumers are met. The heat supply network is in a three-pipe cascade heat supply transmission and distribution mode, first-stage water supply of the heat supply network is 90-120 DEG C, second-stage water supply of the heat supply network is 30-45 DEG C, second-stage return water is 5-10 DEG C, the maximum temperature difference reaches 115 DEG C, ultra-large temperature difference heat supply network operation is achieved, the second-stage return water is firstly fed into a low-grade industrial waste heat source for heating, and outlet water of the second-stage return water is fed into a low-carbon building heat user for direct heat supply and is fed into a high-temperature heat source for continuous heating to be supplied out. Compared with the conventional heat supply network design with the return water supply of 120 / 70 DEG C and the temperature difference of 50 DEG C, the temperature difference is improved by 2.3 times, and the heat supply area can be enlarged by more than 130%.

Description

Technical Field

[0001] This patent relates to a large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology, belonging to the field of dual-carbon clean heating technology. Background Technology

[0002] In practical engineering, there are significant limitations to using low-grade industrial waste heat for heating: although industrial waste heat resources are abundant, their energy grade is often low, and most of the process waste heat is wasted through cooling water circulation systems, with outlet water temperatures typically between 30 and 40°C. However, the primary water supply temperature of most current heating networks is approximately 60–120°C, and the return water temperature is mostly between 40 and 55°C. This is the basic operating condition of traditional heating sources such as cogeneration heat sources or boiler rooms and their heating network systems. Therefore, a large amount of low-grade waste heat from industrial enterprises cannot be directly used for heating and must be recovered through absorption heat pumps, compression heat pumps, etc., which requires a large amount of high-quality, high-cost energy such as driving steam or electricity.

[0003] On the heating user side, due to limitations in the terminal type, public buildings or older residential buildings often use radiators and fan coil units that require higher supply water temperatures, such as 45–60°C, while the return water temperature is typically 35–45°C. However, a larger proportion of newly built residential buildings currently use underfloor heating, which only requires a supply water temperature of 35–40°C and a return water temperature of 25–35°C. The total return water temperature of the primary heating network in current centralized heating systems is typically around 35–55°C.

[0004] On the other hand, Professor Li Xianting's team from the Department of Building Technology Science at Tsinghua University innovatively proposed and developed embedded heat shielding technology. This technology uses embedded or external heat pipes in the building envelope (including walls and windows) to supply heating via low-grade heat exchange media such as low-temperature hot water. This achieves active insulation of the building envelope. In winter, the low-grade heat exchange media heats the building envelope, significantly reducing the temperature difference between outdoor and indoor air, achieving a so-called "heat shielding" effect. This drastically reduces the heating load, potentially by as much as 10-20 W / m² or even lower. At this point, only a moderate amount of heating is needed to meet indoor heating requirements, and the water supply temperature at the heating terminal can be significantly reduced to, for example, 25-35°C. Similarly, in summer, the low-grade heat exchange media can be used to cool the building envelope, significantly reducing indoor temperature and cooling load. If a low-temperature heat source can be obtained cheaply, the aforementioned active temperature control building energy-saving technology based on embedded tube thermal shielding will have a huge building energy-saving effect, which can significantly reduce the overall heating load demand, realize a leapfrog development in the field of clean heating technology in northern regions, and meet the development requirements of heating and people's livelihood services in the era of carbon neutrality.

[0005] Current problems include: First, conventional combined heat and power (CHP) systems and boiler room heating systems, along with their heating network coverage areas, often experience increased heating demand. However, limitations in the pipe diameter and heat transfer capacity of the heating network make expansion and renovation difficult. It is necessary to reduce the return water temperature and increase the temperature difference between the supply and return water in the heating network to accommodate more of the new heating area. Second, while there is potential for upgrading older residential areas within the existing coverage area using embedded pipe heat shielding technology, or for directly incorporating embedded pipe heat shielding technology into new buildings, there is a lack of suitable, inexpensive, low-grade heat sources. While directly using the heating network return water can significantly reduce the return water temperature, it cannot significantly improve the thermal economy. Thirdly, although high-energy-consuming industrial enterprises possess a large amount of low-grade waste heat resources, they are often far from urban areas and their centralized heating networks. If they participate in heating, they often need to use heat pumps to significantly increase the temperature of circulating water to achieve heating. Moreover, the temperature difference between the supply and return water of the heating network is often only 10-30°C, resulting in high initial investment and operating costs. Furthermore, they also need to be equipped with long-distance heating networks, leading to poor overall economic efficiency. Fourthly, even if high-energy-consuming industrial enterprises are located near a large heating area, if the temperature of the waste hot water outlet from the factory is only 25-40°C, there is still a problem of excessively high initial investment and operating costs, resulting in poor thermal economic efficiency. Summary of the Invention

[0006] The purpose and task of this patent is to design a novel heating network system based on embedded tube thermal shielding low-carbon building technology and low-grade waste heat with ultra-large temperature difference, so as to maximize the utilization of industrial waste heat for large-scale urban centralized heating, and significantly improve the heat transmission capacity and heating area of ​​the original urban heating network system, which is expected to help achieve the goal of carbon neutrality in the heating field.

[0007] The specific description of this patent is as follows: A large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology, consisting of a conventional high-temperature heat source S0, conventional terminal heat users U0, a low-grade industrial waste heat source S1, embedded tube thermal shielding low-carbon building heat users U1, and their heating network distribution pipeline components. The primary water supply outlet of the heating network heater 8 of the conventional high-temperature heat source S0 is connected via a V11 electric valve and the primary water supply pipe 11 to the inlet of the matching V19 electric valve of the secondary station plate heat exchanger 6 in the conventional terminal heat user U0, and the inlets of the matching V14 and V16 electric valves of the floor heating heat user 7. The primary return water inlet of the heating network heater 8 is connected to the outlet of the heating network circulation pump P2, and the inlet of the heating network circulation pump P2 is connected to... The outlet of the V18 electric valve is connected, and the inlet of the V18 electric valve is connected via the primary return water pipe 12 of the heating network to the outlet of the matching V20 electric valve of the secondary station plate heat exchanger 6 and the outlets of the matching V16 and V15 electric valves of the floor heating user 7, respectively. The low-grade industrial waste heat source S1 is characterized by having a low-grade waste heat exchanger 1 for dissipating process waste heat. The cooling water inlet of the low-grade waste heat exchanger 1 is connected to the outlet of the process cooling pump P1. The inlet of the process cooling pump P1 is connected to the outlet of the cooling tower 2 via the V2 electric valve and also to the outlet of the V4 electric valve. The cooling water outlet of the low-grade waste heat exchanger 1 is connected to the inlet of the cooling tower 2 via the V1 electric valve and also to the outlet of the V3 electric valve. The inlet of the electric valve is connected to the inlet of the V9 electric valve. The outlet of the V9 electric valve is connected to the outlet of the V18 electric valve and the inlet of the heat network circulation pump P2 via the primary return water pipe 12 of the heat network. The outlet of the V3 electric valve is connected to the inlet of the V18 electric valve and the primary return water pipe 12 of the heat network via the secondary supply water pipe 14 of the heat network. It is also connected to the primary supply water pipe 11 of the heat network via the V17 electric valve and the secondary mixed supply water pipe 15 of the heat network. The embedded tube heat shield low-carbon building heat user U1 includes radiator-type embedded tube heat user U11 and underfloor heating-type embedded tube heat user U12. The radiator-type embedded tube heat user U11's radiator-type embedded tube heating component 3 includes a radiator 31 and a first embedded tube group 32. The heating water inlet of radiator 31 is connected to the secondary mixing water supply pipe 15 of the heating network via a V6 electric valve. The heating water outlet of radiator 31 is connected to the heat shield water inlet of the first embedded pipe group 32. The heat shield water outlet of the first embedded pipe group 32 is connected to the secondary return water pipe 13 of the heating network via a V5 electric valve. The floor heating type embedded pipe heating component 4 of the floor heating type embedded pipe heat user U12 includes a floor heating heat exchanger 41 and a second embedded pipe group 42. The heating water inlet of the floor heating heat exchanger 41 is connected to the secondary mixing water supply pipe 15 of the heating network via a V8 electric valve. The heating water outlet of the floor heating heat exchanger 41 is connected to the heat shield water inlet of the second embedded pipe group 42. The heat shield water outlet of the second embedded pipe group 42 is connected to the secondary return water pipe 13 of the heating network via a V7 electric valve.A V4 electric valve is also installed on the secondary return water pipe 13 of the heating network. The inlet of the V4 electric valve is connected to the outlet of both the V5 and V7 electric valves, and the outlet of the V4 electric valve is connected to the inlet of the process cooling pump P1.

[0008] The heat user U1 of the low-carbon building with embedded pipe heat shield also includes the original heating community transformed embedded pipe heat user U13. The location of the original heating community transformed embedded pipe heat user U13 is distributed in the heating network coverage area where the conventional terminal heat user U0 is located. The transformed embedded pipe heating component 5 of the original heating community transformed embedded pipe heat user U13 includes the original heating heat exchanger 51 and the third embedded pipe group 52. The heating water inlet of the original heating heat exchanger 51 is connected to the outlet of the heating booster pump P3 through the V12 electric valve. The inlet of the heating booster pump P3 is connected to the water intake bypass port of the primary return water pipe 12 of the heating network. The heating water outlet of the original heating heat exchanger 41 is connected to the heat shield water inlet of the third embedded pipe group 52. The heat shield water outlet of the third embedded pipe group 52 is connected to the water discharge bypass port of the primary return water pipe 12 of the heating network through the V13 electric valve.

[0009] The low-grade waste heat exchanger 1 includes one or more process heat exchangers in a high-energy-consuming plant. These process heat exchangers may be located in one plant or distributed in several plants in the same or different areas.

[0010] The radiator-type embedded pipe heat user U11 and the underfloor heating-type embedded pipe heat user U12 in the embedded pipe heat user U1 are located in a different area from the conventional terminal heat user U0 and its heat network coverage area. They are connected to the low-grade industrial waste heat source S1 through the heat network pipeline. Thus, their heating water inlet is connected to the primary return water pipe 12 of the heat network of the conventional terminal heat user U0 and the secondary supply water pipe 14 of the heat network of the low-grade industrial waste heat source S1. Their heat shield water outlet is connected to the secondary return water pipe 13 of the heat network of the low-grade industrial waste heat source S1. The embedded pipe heat shield low-carbon building heat user U1 is located in the heat network coverage area of ​​the conventional terminal heat user U0 and is not connected to the low-grade industrial waste heat source S1 through the heat network pipeline. Thus, its heating water inlet and heat shield water outlet are connected to the water intake bypass port and water discharge bypass port of the primary return water pipe 12 of the heat network, respectively.

[0011] The large temperature difference heating network water pipeline forms a heating network distribution system with three-pipe cascade heating. The normal operating water temperature range of the primary heating network water supply pipe 11 is 90-120℃, the normal operating water temperature range of the primary heating network return water pipe 12 is 35-50℃, the normal operating water temperature range of the secondary heating network water supply pipe 14 is 30-45℃, the normal operating water temperature range of the secondary heating network mixed water supply pipe 15 is 30-45℃, and the normal operating water temperature range of the secondary heating network return water pipe 13 is 5-10℃. The maximum temperature difference of the entire three-pipe heating network composed of the above five branches reaches 115℃, forming a large temperature difference heating network.

[0012] The innovativeness and technical effects of this patent are as follows.

[0013] The heat user side employs various heating terminal methods, including conventional radiators and underfloor heating. More importantly, it utilizes embedded tube thermal shielding low-carbon building energy-saving technology in older, high-energy-consuming residential areas, and improves the processes of new buildings using this technology. This allows for the use of low-grade industrial waste heat. By employing embedded tube thermal shielding components, the indoor heating load and required water temperature are significantly reduced. Low-grade waste heat circulating water at 25-35℃ can be sent to the indoor heating terminals to handle the indoor heating load. After the water temperature drops to 10-25℃, it can enter the embedded tubes to achieve thermal shielding between indoor and outdoor air. Ultra-low temperature heat network return water at 5-10℃ is returned to high-energy-consuming industrial enterprises, where it can be heated and recirculated using their existing cooling water circulation systems. Therefore, this patent achieves the combined use of multiple heating terminal technologies and devices, forming a large-temperature-difference cascade utilization of heat network water and ultra-low temperature heat network return water.

[0014] This patent achieves a design temperature of 120 / 5℃ for the supply and return water of the heating network and an ultra-large supply and return water temperature difference of 115℃. It is a unique and pioneering technology in the field of centralized heating. It creates the best technical conditions for large-scale use of low-grade heat sources such as waste heat from processes to serve as the main heat source for urban centralized heating. It can also significantly reduce circulating water flow, reduce pump consumption and operating costs, and provide an excellent solution to greatly increase the heating area of ​​the original heating network when it is difficult to expand the pipe diameter and heat transmission capacity of urban heating network.

[0015] This patent addresses the modification of conventional heating sources and networks by employing embedded tube thermal shielding low-carbon building technology. This significantly reduces the return water temperature of the heating network, enabling the use of low-grade industrial waste heat for heating within the existing network. It also drastically reduces the heat load and supply water temperature required for indoor heating, achieving deep return water heating. Furthermore, it allows for tiered heating, tiered distribution, and tiered heat release based on energy resource endowment and the energy grade requirements of heat users, significantly reducing fossil fuel consumption. This represents a large-scale carbon-neutral clean heating method.

[0016] The return water temperature of the heating network to the factory is extremely low, which can significantly improve the cooling conditions of process production equipment, increase production efficiency, improve the overall energy utilization rate of the plant, and achieve significant energy-saving and carbon reduction benefits.

[0017] The heat network transmission and distribution system implements a three-pipe transmission and distribution mode to achieve the best match between different heat source supply sides and different heat user demand sides. It flexibly adjusts the heat supply of each heat user and the optimal heat extraction sequence on the heat source side, maximizes the use of low-grade industrial waste heat for heating, reduces fossil energy consumption, achieves better flexibility in adjusting the heat system, realizes flexible heating of the entire system, and further improves the system's energy efficiency ratio and economy.

[0018] Therefore, this patent fundamentally changes the traditional heating system's reliance on fossil fuel heating and conventional heat pump heating, as well as its energy consumption. It realizes efficient centralized heating of a large temperature difference heat network using low-grade heat sources, which has obvious advantages in energy saving, health, environmental protection and economy. It is easy to promote and apply on a large scale, reflecting the actual development needs under carbon neutrality conditions and the theme of energy conservation and environmental protection in our times. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the system of this patent.

[0020] Figure 1 The component numbers and names are as follows: 1. Low-grade waste heat exchanger; 2. Cooling tower; 3. Radiator-type embedded pipe heating assembly; 4. Underfloor heating-type embedded pipe heating assembly; 5. Retrofitted embedded pipe heating assembly; 6. Secondary station plate heat exchanger; 7. Underfloor heating user; 8. Heat network heater; 11. Primary supply pipe of heat network; 12. Primary return pipe of heat network; 13. Secondary return pipe of heat network; 14. Secondary supply pipe of heat network; 15. Secondary mixed supply pipe of heat network; 31. Radiator; 32. First embedded pipe group. 2. Floor heating heat exchanger 41, second embedded tube group 42, original heating heat exchanger 51, third embedded tube group 52, process cooling pump P1, heat network circulation pump P2, heating booster pump P3, conventional high temperature heat source S0, low grade industrial waste heat source S1, conventional terminal heat user U0, embedded tube heat shield low carbon building heat user U1, radiator type embedded tube heat user U11, floor heating type embedded tube heat user U12, original heating community renovation type embedded tube heat user U13. Detailed Implementation

[0021] Figure 1 This is a schematic diagram of the system of this patent.

[0022] The specific description of this patent is as follows: A large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology, consisting of a conventional high-temperature heat source S0, conventional terminal heat users U0, a low-grade industrial waste heat source S1, embedded tube thermal shielding low-carbon building heat users U1, and their heating network distribution pipeline components. The primary water supply outlet of the heating network heater 8 of the conventional high-temperature heat source S0 is connected via a V11 electric valve and the primary water supply pipe 11 to the inlet of the matching V19 electric valve of the secondary station plate heat exchanger 6 in the conventional terminal heat user U0, and the inlets of the matching V14 and V16 electric valves of the floor heating heat user 7. The primary return water inlet of the heating network heater 8 is connected to the outlet of the heating network circulation pump P2, and the inlet of the heating network circulation pump P2 is connected to... The outlet of the V18 electric valve is connected, and the inlet of the V18 electric valve is connected via the primary return water pipe 12 of the heating network to the outlet of the matching V20 electric valve of the secondary station plate heat exchanger 6 and the outlets of the matching V16 and V15 electric valves of the floor heating user 7, respectively. The low-grade industrial waste heat source S1 is characterized by having a low-grade waste heat exchanger 1 for dissipating process waste heat. The cooling water inlet of the low-grade waste heat exchanger 1 is connected to the outlet of the process cooling pump P1. The inlet of the process cooling pump P1 is connected to the outlet of the cooling tower 2 via the V2 electric valve and also to the outlet of the V4 electric valve. The cooling water outlet of the low-grade waste heat exchanger 1 is connected to the inlet of the cooling tower 2 via the V1 electric valve and also to the outlet of the V3 electric valve. The inlet of the electric valve is connected to the inlet of the V9 electric valve. The outlet of the V9 electric valve is connected to the outlet of the V18 electric valve and the inlet of the heat network circulation pump P2 via the primary return water pipe 12 of the heat network. The outlet of the V3 electric valve is connected to the inlet of the V18 electric valve and the primary return water pipe 12 of the heat network via the secondary supply water pipe 14 of the heat network. It is also connected to the primary supply water pipe 11 of the heat network via the V17 electric valve and the secondary mixed supply water pipe 15 of the heat network. The embedded tube heat shield low-carbon building heat user U1 includes radiator-type embedded tube heat user U11 and underfloor heating-type embedded tube heat user U12. The radiator-type embedded tube heat user U11's radiator-type embedded tube heating component 3 includes a radiator 31 and a first embedded tube group 32. The heating water inlet of radiator 31 is connected to the secondary mixing water supply pipe 15 of the heating network via a V6 electric valve. The heating water outlet of radiator 31 is connected to the heat shield water inlet of the first embedded pipe group 32. The heat shield water outlet of the first embedded pipe group 32 is connected to the secondary return water pipe 13 of the heating network via a V5 electric valve. The floor heating type embedded pipe heating component 4 of the floor heating type embedded pipe heat user U12 includes a floor heating heat exchanger 41 and a second embedded pipe group 42. The heating water inlet of the floor heating heat exchanger 41 is connected to the secondary mixing water supply pipe 15 of the heating network via a V8 electric valve. The heating water outlet of the floor heating heat exchanger 41 is connected to the heat shield water inlet of the second embedded pipe group 42. The heat shield water outlet of the second embedded pipe group 42 is connected to the secondary return water pipe 13 of the heating network via a V7 electric valve.A V4 electric valve is also installed on the secondary return water pipe 13 of the heating network. The inlet of the V4 electric valve is connected to the outlet of both the V5 and V7 electric valves, and the outlet of the V4 electric valve is connected to the inlet of the process cooling pump P1.

[0023] The heat user U1 of the low-carbon building with embedded pipe heat shield also includes the original heating community transformed embedded pipe heat user U13. The location of the original heating community transformed embedded pipe heat user U13 is distributed in the heating network coverage area where the conventional terminal heat user U0 is located. The transformed embedded pipe heating component 5 of the original heating community transformed embedded pipe heat user U13 includes the original heating heat exchanger 51 and the third embedded pipe group 52. The heating water inlet of the original heating heat exchanger 51 is connected to the outlet of the heating booster pump P3 through the V12 electric valve. The inlet of the heating booster pump P3 is connected to the water intake bypass port of the primary return water pipe 12 of the heating network. The heating water outlet of the original heating heat exchanger 41 is connected to the heat shield water inlet of the third embedded pipe group 52. The heat shield water outlet of the third embedded pipe group 52 is connected to the water discharge bypass port of the primary return water pipe 12 of the heating network through the V13 electric valve.

[0024] The low-grade waste heat exchanger 1 includes one or more process heat exchangers in a high-energy-consuming plant. These process heat exchangers may be located in one plant or distributed in several plants in the same or different areas.

[0025] The radiator-type embedded pipe heat user U11 and the underfloor heating-type embedded pipe heat user U12 in the embedded pipe heat user U1 are located in a different area from the conventional terminal heat user U0 and its heat network coverage area. They are connected to the low-grade industrial waste heat source S1 through the heat network pipeline. Thus, their heating water inlet is connected to the primary return water pipe 12 of the heat network of the conventional terminal heat user U0 and the secondary supply water pipe 14 of the heat network of the low-grade industrial waste heat source S1. Their heat shield water outlet is connected to the secondary return water pipe 13 of the heat network of the low-grade industrial waste heat source S1. The embedded pipe heat shield low-carbon building heat user U1 is located in the heat network coverage area of ​​the conventional terminal heat user U0 and is not connected to the low-grade industrial waste heat source S1 through the heat network pipeline. Thus, its heating water inlet and heat shield water outlet are connected to the water intake bypass port and water discharge bypass port of the primary return water pipe 12 of the heat network, respectively.

[0026] The large temperature difference heating network water pipeline forms a heating network distribution system with three-pipe cascade heating. The normal operating water temperature range of the primary heating network water supply pipe 11 is 90-120℃, the normal operating water temperature range of the primary heating network return water pipe 12 is 35-50℃, the normal operating water temperature range of the secondary heating network water supply pipe 14 is 30-45℃, the normal operating water temperature range of the secondary heating network mixed water supply pipe 15 is 30-45℃, and the normal operating water temperature range of the secondary heating network return water pipe 13 is 5-10℃. The maximum temperature difference of the entire three-pipe heating network composed of the above five branches reaches 115℃, forming a large temperature difference heating network.

[0027] It should be noted that the specific application of this patent is not limited to the specific description of the above embodiments. Any simple modifications or applications based on this, such as using different terminal types for heat users; simply changing the type, shape, or installation position of the embedded pipe or heating terminal in a low-carbon building with embedded pipe heat shield; or simply modifying the supply and return water loop of the heat network and its connecting pipes and valves, can all be considered to fall within the scope of protection of this patent.

Claims

1. A large temperature difference waste heat heating system for a heating network based on embedded tube heat shielding building temperature control technology, consisting of a conventional high-temperature heat source (S0), conventional terminal heat users (U0), a low-grade industrial waste heat source (S1), embedded tube heat shielding low-carbon building heat users (U1), and their heating network transmission and distribution pipeline components. The heating network heater (8) of the conventional high-temperature heat source (S0) is connected to the primary water supply outlet of the heating network via a V11 electric valve and the primary water supply pipe (11) of the heating network, respectively, to the secondary station plate heat exchanger (6) in the conventional terminal heat user (U0) via a matching V19 electric valve. The inlet of the heating network heater (8) is connected to the inlet of the matching V14 electric valve and V16 electric valve of the floor heating user (7). The inlet of the heating network heater (8) is connected to the outlet of the heating network circulation pump (P2). The inlet of the heating network circulation pump (P2) is connected to the outlet of the V18 electric valve. The inlet of the V18 electric valve is connected to the outlet of the matching V20 electric valve of the secondary station plate heat exchanger (6) and the outlet of the matching V16 electric valve and V15 electric valve of the floor heating user (7) via the heating network primary return water pipe (12). The feature is that... The low-grade industrial waste heat source (S1) is equipped with a low-grade waste heat exchanger (1) for dissipating process waste heat. The cooling water inlet of the low-grade waste heat exchanger (1) is connected to the outlet of the process cooling pump (P1). The inlet of the process cooling pump (P1) is connected to the outlet of the cooling tower (2) via the V2 electric valve, and also to the outlet of the V4 electric valve. The cooling water outlet of the low-grade waste heat exchanger (1) is connected to the inlet of the cooling tower (2) via the V1 electric valve, and also to the inlet of the V3 electric valve and the inlet of the V9 electric valve. The water outlet is connected to the outlet of the V18 electric valve and the inlet of the heat network circulation pump (P2) via the primary return water pipe (12) of the heat network; the outlet of the V3 electric valve is connected to the inlet of the V18 electric valve and the primary return water pipe (12) of the heat network via the secondary supply water pipe (14) of the heat network, and is connected to the primary supply water pipe (11) of the heat network via the V17 electric valve, and is also connected to the secondary mixed supply water pipe (15) of the heat network; the embedded pipe heat shield low-carbon building heat user (U1) includes radiator type embedded pipe heat user (U11) and underfloor heating type embedded pipe heat user (U12), wherein the radiator type embedded pipe heat user (U11) 1) The radiator-type embedded pipe heating assembly (3) includes a radiator (31) and a first embedded pipe assembly (32), wherein the heating water inlet of the radiator (31) is connected to the secondary mixing water supply pipe (15) of the heating network through a V6 electric valve, the heating water outlet of the radiator (31) is connected to the heat shield water inlet of the first embedded pipe assembly (32), and the heat shield water outlet of the first embedded pipe assembly (32) is connected to the secondary return water pipe (13) of the heating network through a V5 electric valve; the floor heating type embedded pipe heating assembly (4) of the floor heating type embedded pipe heat user (U12) includes a floor heating heat exchanger (41) and a second embedded pipe assembly (42) The heating water inlet of the floor heating heat exchanger (41) is connected to the secondary mixing water supply pipe (15) of the heating network through a V8 electric valve. The heating water outlet of the floor heating heat exchanger (41) is connected to the heat shield water inlet of the second embedded pipe group (42). The heat shield water outlet of the second embedded pipe group (42) is connected to the secondary return water pipe (13) of the heating network through a V7 electric valve. A V4 electric valve is also installed on the secondary return water pipe (13). The inlet of the V4 electric valve is connected to the outlet of the V5 electric valve and the V7 electric valve respectively. The outlet of the V4 electric valve is connected to the inlet of the process cooling pump (P1).

2. The large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology as described in claim 1, characterized in that... The aforementioned embedded pipe heat shield low-carbon building heat users (U1) also include original heating community retrofitted embedded pipe heat users (U13). The original heating community retrofitted embedded pipe heat users (U13) are located in the heating network coverage area where the conventional terminal heat users (U0) are located. The retrofitted embedded pipe heating components (5) of the original heating community retrofitted embedded pipe heat users (U13) include the original heating heat exchanger (51) and the third embedded pipe group (52), wherein the original heating heat exchanger ( The heating water inlet of 51) is connected to the outlet of the heating booster pump (P3) through the V12 electric valve. The inlet of the heating booster pump (P3) is connected to the water intake bypass of the primary return water pipe (12) of the heating network. The heating water outlet of the original heating heat exchanger (51) is connected to the heat shield water inlet of the third embedded pipe group (52). The heat shield water outlet of the third embedded pipe group (52) is connected to the water discharge bypass of the primary return water pipe (12) of the heating network through the V13 electric valve.

3. The large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology as described in claim 1, characterized in that... The low-grade waste heat exchanger (1) includes one or more process heat exchangers in high-energy-consuming plants. These process heat exchangers may be located in one plant or distributed in several plants in the same or different areas.

4. The large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology as described in claim 2, characterized in that... The locations of the radiator-type embedded pipe heat users (U11) and the underfloor heating-type embedded pipe heat users (U12) in the aforementioned embedded pipe heat users (U1) of low-carbon buildings are not in the same area as the conventional terminal heat users (U0) and their heat network coverage areas. They are connected to the low-grade industrial waste heat source (S1) through heat network pipelines. Therefore, their heating water inlets are connected to the primary return water pipe (12) of the conventional terminal heat user (U0) and the secondary supply water pipe (14) of the low-grade industrial waste heat source (S1) of the heat network. Meanwhile, their heat-shielded water outlets... The water outlet is connected to the secondary return water pipe (13) of the heat network of the low-grade industrial waste heat source (S1); the location of the embedded heat shield low-carbon building heat user (U1) in the embedded heat shield is distributed in the heat network coverage area where the conventional terminal heat user (U0) is located, and is not connected to the low-grade industrial waste heat source (S1) through the heat network pipeline. Thus, its heating water inlet and heat shield water outlet are respectively connected to the water intake bypass port and water discharge bypass port of the primary return water pipe (12) of the heat network located at the front and rear respectively.

5. The large temperature difference waste heat heating system for a heating network based on embedded tube thermal shielding building temperature control technology as described in claim 1, characterized in that... The aforementioned large temperature difference waste heat heating system forms a three-pipe cascade heating system. The operating water temperature range of the primary water supply pipe (11) is 90-120℃, the operating water temperature range of the primary return water pipe (12) is 35-50℃, the operating water temperature range of the secondary water supply pipe (14) is 30-45℃, the operating water temperature range of the secondary mixed water supply pipe (15) is 30-45℃, and the operating water temperature range of the secondary return water pipe (13) is 5-10℃. The maximum temperature difference of the overall three-pipe heating network composed of the above five branches reaches 115℃, forming a large temperature difference heating network.

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