Embedded pipe heat shielding ultra-low energy consumption building heat supply system based on low-grade industrial waste heat

Abstract

According to the embedded pipe heat shielding ultra-low energy consumption building heat supply system based on the low-grade industrial waste heat, all heat supply sources adopt low-grade industrial waste heat resources, and heat supply load requirements of conventional buildings and low-carbon buildings can be met without adopting a heat pump or other high-grade heat source modes; heat supply network supplied water is firstly fed into a floor heating heat exchanger of a conventional tail end heat consumer, cooled first-stage heat supply network return water is fed into an indoor heating tail end of a low-carbon building heat consumer, and further cooled second-stage heat supply network return water is fed into an embedded pipe heat exchanger in an enclosure structure to achieve heat shielding of air inside and outside a building. And the ultralow-temperature three-stage heat supply network return water returns to the high-energy-consumption industrial enterprise to continue waste heat heating circulation. The heat supply network achieves cascade heat supply transmission and distribution in a three-pipe water return mode, the temperature of supplied water of the heat supply network ranges from 30 DEG C to 40 DEG C, the temperature of first-stage water return ranges from 25 DEG C to 30 DEG C, the temperature of second-stage water return ranges from 10 DEG C to 20 DEG C, the temperature of third-stage water return ranges from 5 DEG C to 10 DEG C, and the maximum temperature difference ranges from 25 DEG C to 35 DEG

Description

TECHNICAL FIELD

[0001] The patent relates to a pipe-embedded heat shield ultra-low energy consumption building heating system based on low-grade industrial waste heat, belonging to the field of industrial energy saving and clean heating. BACKGROUND

[0002] At present, making full use of various waste heat resources of high energy consumption industrial enterprises has become one of the main solutions to significantly reduce fossil energy heating.

[0003] In actual engineering practice, there are significant limitations when using industrial low-grade waste heat resources for heating: although industrial waste heat resources are very rich, their energy grade is often low, and most process waste heat is wasted through cooling circulating water systems, with an outlet water temperature of 30-40°C. Therefore, a large amount of industrial low-grade waste heat cannot be directly used for heating, and needs to be recovered through absorption heat pumps, compression heat pumps, etc., which requires a large amount of high-quality and high-cost energy such as driving steam or electricity.

[0004] On the heating user side, due to the limitations of the end type, public buildings or old residential buildings use radiators, fan coils, etc. which require higher water supply temperature, for example, 45-60°C, and the return water temperature is often 35-45°C. At present, the larger proportion of heating end type for residential buildings is floor heating, which requires a water supply temperature of only 35-40°C, and a return water temperature of 25-35°C. The total return water temperature of the primary network of the current central heating heat network is usually about 35-55°C.

[0005] On the other hand, Professor Li Xianting's team of the Department of Building Technology Science of Tsinghua University innovatively proposed and developed the pipe-embedded heat shield technology, which uses low-temperature heat source water and other low-grade heat exchange media to heat the building envelope (including walls and windows, etc.) through embedded or external heat exchange pipes, realizes active insulation of the envelope, and basically reduces the influence range between outdoor air temperature and indoor air temperature in winter, achieving the so-called "heat shield" effect, thereby greatly reducing the heating load, which can be reduced to 10-20W / ㎡ or lower. At this time, only a small amount of heating is needed to meet the indoor heating temperature requirement, and the water supply temperature of the heating end can also be greatly reduced to, for example, 25-35°C. Similarly, in summer, the low-grade heat exchange medium can also be used to cool the envelope, thereby significantly reducing the indoor temperature and cooling load. If low-temperature heat sources can be obtained at a low cost, the above-mentioned active temperature control type building energy saving technology based on pipe-embedded heat shield will have a huge building energy saving effect, which can greatly reduce the overall heating load demand and realize the leap-forward development of clean heating technology in the northern region.

[0006] The existing problems include: first, the conventional combined heat and power system and boiler room heating system and the heat network covering area have the possibility of old community reconstruction through the embedded pipe heat shield technology or direct combination of the embedded pipe heat shield technology for newly built buildings, but there is no suitable low-cost low-grade heat source, and direct use of heat network return water can significantly reduce the return water temperature, but cannot significantly improve the thermal economy; second, although high energy-consuming industrial enterprises have a large amount of low-grade waste heat resources, they are often far away from the urban area and the central heating heat network, and if they participate in heating, they often need to use heat pumps to significantly increase the circulating water temperature to achieve heating, and the heat network supply and return water temperature difference is often only 10-30℃, the initial investment and operating cost is often high, and a long-distance heat network is also needed, resulting in poor overall economy; third, similarly, even if there are more heating areas near the high energy-consuming industrial enterprises, if the factory waste heat water outlet temperature is only 25-40℃, the initial investment and operating cost is also too high, resulting in poor thermal economy. SUMMARY

[0007] The purpose and task of the patent is to design a brand new embedded pipe heat shield low-carbon building technology and low-grade large temperature difference heat network heating system based on waste heat, to realize large-scale urban central heating based on industrial waste heat.

[0008] The specific description of the patent is: an embedded pipe heat shield ultra-low energy consumption building heating system based on low-grade industrial waste heat, which is composed of a low-grade industrial waste heat source, an embedded pipe heat shield low-carbon building heat user and a heat network transmission and distribution pipeline component, the low-grade industrial waste heat source is provided with a low-grade waste heat exchanger 1 for releasing process waste heat, the cooling water inlet of the low-grade waste heat exchanger 1 is connected with the water outlet of a process cooling pump P1, the water inlet of the process cooling pump P1 is connected with the water outlet of a V4 electric valve in addition to being connected with the outlet of a cooling tower 2 through a V2 electric valve, and the cooling water outlet of the low-grade waste heat exchanger 1 is connected with the water inlet of a V3 electric valve in addition to being connected with the water inlet of the cooling tower 2 through a V1 electric valve; the water outlet of the V3 electric valve is communicated with the water inlet of a V8 electric valve through a heat network water supply pipe 11; the indoor heating terminal of the embedded pipe heat shield low-carbon building heat user adopts a floor heating type embedded pipe heating assembly 3, which includes a first floor heating heat exchanger 31 and a first embedded pipe group 32, wherein the heating water inlet of the first floor heating heat exchanger 31 is communicated with the heat network water supply pipe 11 through a V8 electric valve, the heating water outlet of the first floor heating heat exchanger 31 is connected with the heat shield water inlet of the first embedded pipe group 32 through a heat network secondary return water pipe 13, and the heat shield water outlet of the first embedded pipe group 32 is communicated with the heat network tertiary return water pipe 14 through a V7 electric valve; a V4 electric valve is further arranged on the heat network tertiary return water pipe 14, the water inlet of the V4 electric valve is connected with the water outlet of the V7 electric valve, and the water outlet of the V4 electric valve is connected with the water inlet of the process cooling pump P1.

[0009] The indoor heating terminal type of the low-carbon building heat user shielded by the embedded pipe heat shield also includes a radiator type embedded pipe heating assembly 4, wherein the radiator type embedded pipe heating assembly 4 includes a radiator 41 and a second embedded pipe group 42, wherein the heating water inlet of the radiator 41 is communicated with the heat supply pipe 11 through a V6 electric valve, the heating water outlet of the radiator 41 is connected with the heat shield water inlet of the second embedded pipe group 42 through the heat return pipe 13, and the heat shield water outlet of the second embedded pipe group 42 is communicated with the heat return pipe 14 through a V5 electric valve.

[0010] The heating system also includes a conventional building heat user, and the indoor heating terminal type of the conventional building heat user adopts a second floor heating heat exchanger 5, wherein the heating water inlet of the second floor heating heat exchanger 5 is communicated with the heat supply pipe 11 through a V12 electric valve, the heating water outlet of the second floor heating heat exchanger 5 is communicated with the heat return pipe 12 through a V11 electric valve, the water inlet of the V12 electric valve is connected with the water outlet of the V11 electric valve through a V13 electric valve, at this time, the heat supply pipe 11 and the heat return pipe 12 are also provided with a communication pipe, and the communication pipe is provided with a V14 electric valve; at this time, the heating water inlet of the first floor heating heat exchanger 31 is connected with the water outlet of a heating booster pump P2 through a V8 electric valve first, the water inlet of the heating booster pump P2 is communicated with the heat return pipe 12, and then communicated with the heat supply pipe 11 through the V14 electric valve; the water inlet of the heating booster pump P2 is also connected with the heat shield water outlet of the first embedded pipe group 32 through a V7 electric valve and communicated with the heat return pipe 14.

[0011] The heat supply pipe circuit of the heating system forms a heat supply network system in stages, wherein the operation temperature range of the heat supply pipe 11 is 30-40℃, the operation temperature range of the heat return pipe 12 is 25-30℃, the operation temperature range of the heat return pipe 13 is 10-20℃, the operation temperature range of the heat return pipe 14 is 5-10℃, and the maximum temperature difference range is 25-35℃.

[0012] The innovation and technical effects of the patent are as follows.

[0013] The heat user side adopts different heat supply terminal modes, including the conventional floor heating mode, and more importantly, the low-carbon building energy-saving technology of heat shield with embedded pipes is adopted in the old and old community with high energy consumption, and the technology is improved for the newly built buildings, so that the low-grade industrial waste heat is used, the indoor heating heat load and the required water supply temperature are greatly reduced through the heat shield assembly with embedded pipes, so that the indoor heating terminal can use the low-grade waste heat circulating water of 25-35℃ to bear the indoor heating load, and after the water temperature is reduced to 10-25℃, it can also enter the embedded pipe to realize the heat shield function of indoor and outdoor air, and the super-low temperature heat network return water of 5-10℃ can be returned to the high-energy-consuming industrial enterprise, so that it can use the original cooling water circulation system for heating and recycling. Therefore, the patent realizes the combined use of various heat supply terminal technologies and devices, and forms a large temperature difference cascade utilization of heat network water and super-low temperature heat network return water.

[0014] The patent realizes a low-temperature waste heat water heat network, in which the water supply temperature is 30-40℃, the return water temperature is 5-10℃, and the water supply and return temperature difference of the heat network is 25-35℃, which is basically equivalent to the water supply and return temperature difference of the conventional urban heat network, so that the heat network pipe diameter and initial investment, water pump flow and power consumption are not greater than those of the conventional heat network, which creates technical conditions for large-scale use of process waste heat and other low-grade heat sources to bear the main heat source of urban centralized heating.

[0015] The heat network return water temperature returned to the factory is very low, which can greatly improve the cooling conditions of process production equipment, improve production efficiency, improve the energy utilization rate of the whole factory, and achieve significant energy saving and carbon reduction benefits.

[0016] The heat network loop realizes a three-stage heat supply and distribution mode, which can flexibly adjust the heat supply of each heat user, completely uses low-grade industrial waste heat for heating, reduces the consumption of fossil energy, and has a high system energy efficiency ratio and economy.

[0017] Therefore, the patent fundamentally changes the form and energy consumption of the conventional heating system which relies on fossil fuel heating and conventional heat pump heating, realizes low-grade heat source for large temperature difference heat network efficient centralized heating, has obvious energy saving, health, environmental protection and economic advantages, and is easy to popularize and apply on a large scale. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 、 2 is a system schematic diagram of the patent.

[0019] Figure 1 、 2The component numbers and names are as follows: Low-grade waste heat exchanger 1, Cooling tower 2, Underfloor heating type embedded pipe heating assembly 3, Radiator type embedded pipe heating assembly 4, Second floor heating heat exchanger 5, Heat network supply pipe 11, Heat network primary return pipe 12, Heat network secondary return pipe 13, Heat network tertiary return pipe 14, First floor heating heat exchanger 31, First embedded pipe group 32, Radiator 41, Second embedded pipe group 42, Process cooling pump P1, Heating booster pump P2. Detailed Implementation

[0020] Figure 1 , 2 This is a schematic diagram of the system of this patent.

[0021] Specific embodiment 1 of this patent: See Figure 1 As shown, the low-grade industrial waste heat-based embedded-tube heat shielded ultra-low energy building heating system consists of a low-grade industrial waste heat source, embedded-tube heat shielded low-carbon building heat users, and their heat network distribution pipeline components. The low-grade industrial waste heat source 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 electric valve V2 and also to the outlet of electric valve V4. The cooling water outlet of the low-grade waste heat exchanger 1 is connected to the inlet of the cooling tower 2 via electric valve V1 and also to the inlet of electric valve V3. The outlet of electric valve V3 is connected to electric valve V8 via the heat network water supply pipe 11. The inlets are connected; the indoor heating terminal of the heat user in the embedded tube heat shielding low-carbon building adopts a floor heating type embedded tube heating component 3, including a first floor heating heat exchanger 31 and a first embedded tube group 32. The heating water inlet of the first floor heating heat exchanger 31 is connected to the heat network water supply pipe 11 through a V8 electric valve. The heating water outlet of the first floor heating heat exchanger 31 is connected to the heat shielding water inlet of the first embedded tube group 32 through the heat network secondary return water pipe 13. The heat shielding water outlet of the first embedded tube group 32 is connected to the heat network tertiary return water pipe 14 through a V7 electric valve. A V4 electric valve is also installed on the heat network tertiary return water pipe 14. The inlet of the V4 electric valve is connected to the outlet of the V7 electric valve, and the outlet of the V4 electric valve is connected to the inlet of the process cooling pump P1.

[0022] The indoor heating terminal type for heat users in low-carbon buildings with embedded tube heat shielding also includes radiator-type embedded tube heating components 4. The radiator-type embedded tube heating components 4 include radiators 41 and a second embedded tube group 42. The heating water inlet of the radiator 41 is connected to the heating network supply water pipe 11 through a V6 electric valve. The heating water outlet of the radiator 41 is connected to the heat shield water inlet of the second embedded tube group 42 through the secondary return water pipe 13 of the heating network. The heat shield water outlet of the second embedded tube group 42 is connected to the tertiary return water pipe 14 of the heating network through a V5 electric valve.

[0023] The water supply pipeline of the heat supply system forms a heat supply network distribution system with cascade heat supply, wherein the operation water temperature range of the heat supply water supply pipe 11 is 30-40℃, the operation water temperature range of the heat supply first return water pipe 12 is 25-30℃, the operation water temperature range of the heat supply second return water pipe 13 is 10-20℃, the operation water temperature range of the heat supply third return water pipe 14 is 5-10℃, and the maximum temperature difference range is 25-35℃.

[0024] The specific embodiment 2 of the patent is shown in Figure 2 The specific embodiment 2 of the patent is shown in

[0025] It should be noted that the specific application mode of the patent is not limited to the specific description of the above embodiments, and simple transformation applications made on this basis, such as different terminal types of heat users, simple changes of the type, shape, installation position of the embedded pipe heat shield in the low-carbon building, simple transformation of the heat supply water supply and return loop and its connecting pipeline, valves and the like, can be considered to fall within the protection scope of the patent.

Claims

1. A heat supply system for an ultra-low energy consumption building based on a low-grade industrial waste heat, which is composed of a low-grade industrial waste heat source, a low-carbon building heat user with a pipe-in-pipe heat shield, and a heat network transmission and distribution pipeline component, characterized in that, The low-grade industrial waste heat source is provided with a low-grade waste heat exchanger (1) for emitting process waste heat, a cooling water inlet of the low-grade waste heat exchanger (1) is connected with a water outlet of a process cooling pump (P1), an inlet of the process cooling pump (P1) is connected with a water outlet of a V4 electric valve in addition to being connected with an outlet of a cooling tower (2) through a V2 electric valve, a cooling water outlet of the low-grade waste heat exchanger (1) is connected with a water inlet of a V3 electric valve in addition to being connected with a water inlet of the cooling tower (2) through a V1 electric valve; a water outlet of the V3 electric valve is communicated with a water inlet of a V8 electric valve through a heat network water supply pipe (11); the indoor heating terminal of the low-carbon building heat user of the embedded pipe heat shield adopts a floor heating type embedded pipe heating assembly (3) including a first floor heating heat exchanger (31) and a first embedded pipe group (32), wherein a heating water inlet of the first floor heating heat exchanger (31) is communicated with the heat network water supply pipe (11) through the V8 electric valve, a heating water outlet of the first floor heating heat exchanger (31) is connected with a heat shield water inlet of the first embedded pipe group (32) through a heat network secondary return water pipe (13), and a heat shield water outlet of the first embedded pipe group (32) is communicated with a heat network tertiary return water pipe (14) through a V7 electric valve; the heat network tertiary return water pipe (14) is further provided with a V4 electric valve, a water inlet of the V4 electric valve is connected with a water outlet of the V7 electric valve, and a water outlet of the V4 electric valve is connected with a water inlet of the process cooling pump (P1).

2. The embedded pipe heat shield ultra-low energy consumption building heating system based on low-grade industrial waste heat according to claim 1, characterized in that The indoor heating terminal type of the low-carbon building heat user of the embedded pipe heat shield further includes a radiator type embedded pipe heating assembly (4), wherein the radiator type embedded pipe heating assembly (4) includes a radiator (41) and a second embedded pipe group (42), wherein a heating water inlet of the radiator (41) is communicated with the heat network water supply pipe (11) through a V6 electric valve, a heating water outlet of the radiator (41) is connected with a heat shield water inlet of the second embedded pipe group (42) through the heat network secondary return water pipe (13), and a heat shield water outlet of the second embedded pipe group (42) is communicated with the heat network tertiary return water pipe (14) through a V5 electric valve.

3. The embedded pipe heat shield ultra-low energy consumption building heating system based on low-grade industrial waste heat according to claim 1, characterized in that The heating system further comprises a conventional building heat user, and an indoor heating terminal type of the building heat user is a second floor heating heat exchanger (5), wherein a heating water inlet of the second floor heating heat exchanger (5) is communicated with a heat network water supply pipe (11) through a V12 electric valve, a heating water outlet of the second floor heating heat exchanger (5) is communicated with a heat network first stage return water pipe (12) through a V11 electric valve, and a water inlet of the V12 electric valve is connected with a water outlet of the V11 electric valve through a V13 electric valve, at this time, the heat network water supply pipe (11) and the heat network first stage return water pipe (12) are further provided with a communication pipe, and the communication pipe is provided with a V14 electric valve; at this time, a heating water inlet of the first floor heating heat exchanger (31) is firstly connected with a water outlet of a heating booster pump (P2) through a V8 electric valve, a water inlet of the heating booster pump (P2) is communicated with the heat network first stage return water pipe (12), and then communicated with the heat network water supply pipe (11) through the V14 electric valve; the water inlet of the heating booster pump (P2) is further connected with a hot shielding water outlet of a first embedded pipe group (32) through a V7 electric valve and communicated with a heat network third stage return water pipe (14).

4. The low-grade industrial waste heat based embedded tube thermal shield ultra-low energy consumption building heating system according to claim 1, characterized in that The network water pipe of the heating system forms a heat network transmission and distribution system of gradient heating, wherein a running water temperature range of the heat network water supply pipe (11) is 30-40 DEG C, a running water temperature range of the heat network first stage return water pipe (12) is 25-30 DEG C, a running water temperature range of the heat network second stage return water pipe (13) is 10-20 DEG C, a running water temperature range of the heat network third stage return water pipe (14) is 5-10 DEG C, and a maximum temperature difference range is 25-35 DEG C.

Images