Novel heat supply network system
Through the multi-stage heat exchange process of temperature difference type and direct combustion type absorption heat exchange unit, the problems of insufficient heat supply of primary heat network and insufficient return water heating of secondary heat network are solved, and efficient energy utilization and waste heat recovery of the heating system are achieved.
Patent Information
- Application Number
- CN202422443855.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-10
- Publication Date
- 2025-08-01
- Estimated Expiration
- 2034-10-10
AI Technical Summary
The heat of the primary heating network water supply in the existing heating system is not fully utilized, and the return water heating of the secondary heating network is not sufficient, resulting in low comprehensive energy utilization efficiency of the heating system.
The temperature difference type and direct combustion type absorption heat exchange unit are adopted to recover heat from the primary heat network water supply through a multi-stage heat exchange process, and the secondary heat network return water is heated through multiple stages to increase the temperature difference of the supply and return water and improve energy utilization efficiency.
The full recycling of the primary heat supply heat and the multi-stage heating of the secondary heat network return water have been achieved, which significantly improves the comprehensive energy utilization efficiency of the heating system, saves power transmission costs, and provides favorable conditions for the recovery of waste heat on the heat source side.
Smart Images
Figure CN223178908U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of urban heating, and particularly relates to a novel heat network system. Background Art
[0002] At present, the heating in northern cities of China mainly relies on centralized heating. The centralized heating heat network consists of a primary heat network, a heat exchange station, and a secondary heat network. The primary heat network is led out from a heat source point, and hot water is transported through pipelines to each heat exchange station in the urban area. In the heat exchange station, the primary heat network is used to heat the circulating water of the secondary heat network. The supply and return water circulation from the heat exchange station to each heat user is realized by the pressurization of the secondary heat network circulating pump. Moreover, with the continuous development of urban long-distance heat supply in recent years, the scale of urban central heating is getting larger and larger, and the energy consumption in the heating system, including the power consumption of the heat network circulating pump, is also increasing. Therefore, the energy-saving transformation of the heating system has become increasingly important.
[0003] To reduce the construction cost of the heating pipeline network and the cost of heat transfer, it is necessary to increase the supply temperature of the hot water in the primary network or reduce its return water temperature as much as possible to increase the temperature difference between the supply and return water, so as to reduce the required flow rate under the condition of transporting the same amount of heat. For ordinary heat exchangers, a certain heat exchange temperature difference is required between the hot water in the primary network and the hot water in the secondary network to achieve effective heat exchange. Therefore, in the prior art, the return water temperature of the hot water in the primary network theoretically needs to be higher than the inlet temperature of the hot water in the secondary network, and the heat energy of the hot water in the primary network cannot be fully utilized, resulting in a low comprehensive energy utilization efficiency of the heating system.
[0004] Therefore, there is an urgent need to propose a novel heat network system that can fully recover and utilize the heat of the primary heat network supply water, perform multi-stage full heating on the secondary heat network return water, greatly improve the heat transfer capacity of the pipeline network, and improve the comprehensive energy utilization efficiency of the heating system. Content of the Utility Model
[0005] The purpose of the utility model is to provide a novel heat network system to solve the problems existing in the above-mentioned prior art, fully recover and utilize the heat of the primary heat network supply water, perform multi-stage full heating on the secondary heat network return water, increase the temperature difference between the supply and return water of the primary heat network, make the temperature of the secondary heat network supply water as close as possible to the temperature of the primary heat network supply water, provide favorable conditions for the waste heat recovery on the heat source side, and greatly improve the comprehensive energy utilization efficiency of the heating system.
[0006] To achieve the above purpose, the utility model provides the following solution: Provide a novel heat network system, including a primary heat network pipeline system and a secondary heat network pipeline system, and further including:
[0007] A temperature difference type absorption heat exchange unit, including a hot water generator, a hot water evaporator, a hot water absorber, and a hot water condenser;
[0008] The direct-fired absorption heat exchange unit includes a direct-fired generator, a direct-fired evaporator, a direct-fired absorber, and a direct-fired condenser;
[0009] The primary heat network pipeline system includes a first heating section and a second heating section connected in series along the water supply direction; the first heating section is sequentially connected to the hot water generator and the hot water evaporator along the water supply direction; the second heating section is connected to the direct-fired evaporator;
[0010] The secondary heat network pipeline system includes a first branch and a second branch connected in parallel; the first branch is sequentially connected to the hot water absorber and the hot water condenser along the water supply direction; the second branch is sequentially connected to the direct-fired absorber and the direct-fired condenser along the water supply direction.
[0011] Preferably, the temperature difference type absorption heat exchange unit is a hot water type lithium bromide heat exchange unit, and the direct-fired type absorption heat exchange unit is a direct-fired type lithium bromide heat exchange unit.
[0012] Preferably, the driving source inlet of the hot water generator is connected to the first heating section; the driving source inlet of the direct-fired generator is connected to the gas supply device.
[0013] Preferably, the temperature difference type absorption heat exchange unit further includes a heat exchanger, and the heat exchanger is connected to a part of the first heating section between the hot water generator and the hot water evaporator; the primary heat network pipeline system includes a third branch connected in parallel with the first branch and the second branch; the heat exchanger is connected to the first heating section and the third branch.
[0014] Preferably, the heat exchanger is a plate heat exchanger.
[0015] Preferably, the primary heat network pipeline system includes a primary heat network water supply pipeline and a primary heat network return water pipeline, and the first heating section and the second heating section are located in the primary heat network water supply pipeline; the primary heat network return water pipeline is connected to the outlet of the second heating section; the secondary heat network pipeline system includes a secondary heat network return water pipeline and a secondary heat network water supply pipeline, and the first branch, the second branch, and the third branch are located in the secondary heat network return water pipeline, and the outlets of the first branch, the second branch, and the third branch are all connected to the secondary heat network water supply pipeline.
[0016] Preferably, the secondary heat network water supply pipeline includes a collecting section and a heating section; the collecting section is connected to the outlets of the first branch, the second branch, and the third branch; the heating section is connected to the water outlet end of the collecting section, and a hot water boiler is connected to the heating section.
[0017] Preferably, the hot water boiler is connected in parallel with the heating section and is communicated with the gas supply device.
[0018] Preferably, a power regulating device for regulating the heating power is provided in the hot water boiler.
[0019] Preferably, temperature detection devices are provided in the heating section of the secondary heat network water supply pipeline and the primary heat network water supply pipeline, and the temperature detection devices are electrically connected to the power regulating device.
[0020] The present utility model has achieved the following technical effects compared with the prior art:
[0021] The primary heat network water supply of the present utility model is first cooled in the hot water generator to extract the high-grade heat of the primary heat network water supply. Then, the primary heat network water supply is introduced into the hot water evaporator to extract the low-grade heat of the primary heat network water supply. The secondary heat network return water on the first branch is directly introduced into the hot water absorber to be heated once, and then introduced into the hot water condenser for secondary heating to form high-temperature secondary heat network water supply. After that, the primary heat network water supply is reduced to a temperature lower than that of the secondary heat network water supply and then enters the direct-fired evaporator for in-depth heat extraction, further reducing the temperature of the primary heat network water supply to form the primary heat network return water. At the same time, the secondary heat network return water is further transported along the second branch to the direct-fired absorber for preliminary heating, and then further heated in the direct-fired condenser to form high-temperature secondary heat network water supply. After that, the high-temperature secondary heat network water supply of the first branch and the high-temperature secondary heat network water supply of the second branch converge to provide the secondary heat network water supply to the heat-using unit. The present utility model can fully recover and utilize the heat of the primary heat network water supply, perform multi-stage full heating on the secondary heat network return water, widen the temperature difference between the supply and return water of the primary heat network, greatly improve the heat transmission capacity of the pipe network, improve the comprehensive energy utilization efficiency of the heating system, save the transmission electricity cost, provide favorable conditions for the waste heat recovery on the heat source side, greatly improve the comprehensive energy utilization efficiency of the heating system, and make the temperature of the secondary heat network water supply as close as possible to the temperature of the primary heat network water supply.
[0022] Other technical solutions of the present utility model also have the following technical effects:
[0023] The primary heat supply water of the primary heat network first enters the temperature difference type absorption heat exchanger unit to initially heat the secondary heat network return water on the first branch, forming the secondary heat network supply water. In the temperature difference type absorption heat exchanger unit, the primary heat supply water in the medium temperature section serves as the high-temperature heat source for the plate heat exchanger to heat the secondary heat network. The primary heat supply water after preliminary cooling then enters the direct-fired type absorption heat exchanger unit for in-depth heat extraction to further reduce the temperature of the primary heat supply water. The direct-fired type absorption heat exchanger unit initially heats the secondary heat network return water on the second branch, forming the secondary heat network supply water. The secondary heat network supply water output from the first branch and the second branch is mixed and then enters the gas-fired hot water boiler for secondary heating to meet the actual supply water temperature requirements of the secondary heat network water, ensuring that the temperature of the primary heat supply water is equal to that of the secondary heat network supply water, significantly reducing the temperature of the primary heat network return water, achieving a larger temperature difference between the supply and return water of the primary heat network, greatly improving the heat transfer capacity of the pipe network, saving the transmission electricity cost, and providing favorable conditions for the waste heat recovery on the heat source side. Brief Description of the Drawings
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0025] Figure 1 It is a schematic diagram of the overall system of the present invention.
[0026] Among them, 1. Primary heat network pipeline system; 2. Secondary heat network pipeline system; 3. Temperature difference type absorption heat exchanger unit; 4. Direct-fired type absorption heat exchanger unit; 5. Hot water generator; 6. Hot water evaporator; 7. Hot water absorber; 8. Hot water condenser; 9. Direct-fired generator; 10. Direct-fired evaporator; 11. Direct-fired absorber; 12. Direct-fired condenser; 13. First heating section; 14. Second heating section; 15. First branch; 16. Second branch; 17. Heat exchanger; 18. Third branch; 19. Primary heat network supply water pipeline; 20. Primary heat network return water pipeline; 21. Secondary heat network return water pipeline; 22. Secondary heat network supply water pipeline; 23. Collection section; 24. Post-collection section; 25. Hot water boiler. Detailed Embodiments
[0027] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0028] To make the above objects, features, and advantages of the present utility model more obvious and understandable, the present utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.
[0029] Please refer to Figure 1 As shown, in this embodiment, a new type of heat network system is provided, including a primary heat network pipeline system 1, a secondary heat network pipeline system 2, a temperature difference type absorption heat exchange unit 3, and a direct combustion type absorption heat exchange unit 4. The temperature difference type absorption heat exchange unit 3 includes a hot water generator 5, a hot water evaporator 6, a hot water absorber 7, and a hot water condenser 8 that cooperate with each other. The driving heat source of the hot water generator 5 is high-temperature hot water. The direct combustion type absorption heat exchange unit 4 includes a direct combustion generator 9, a direct combustion evaporator 10, a direct combustion absorber 11, and a direct combustion condenser 12 that cooperate with each other. The driving source of the direct combustion generator 9 is preferably the combustion work of natural gas. The primary heat network pipeline system 1 includes a first heating section 13 and a second heating section 14, and the first heating section 13 and the second heating section 14 are connected in series in sequence along the water conveyance direction of the primary heat network pipeline system 1. And in the first heating section 13, the first heating section 13 is connected to the hot water generator 5 and the hot water evaporator 6 in sequence along the water conveyance direction. Preferably, the driving source inlet of the hot water generator 5 is communicated with the first heating section 13, and the hot water generator 5 uses the hot water input by the first heating section 13 as the driving source. The second heating section 14 is communicated with the direct combustion evaporator 10. The secondary heat network pipeline system 2 includes a first branch 15 and a second branch 16, and the first branch 15 and the second branch 16 are connected in parallel. Preferably, the inlet ends of the first branch 15 and the second branch 16 are communicated with the return water section of the secondary heat network pipeline system 2, and the outlet ends of the first branch 15 and the second branch 16 are communicated with the water supply section of the secondary heat network pipeline system 2. The first branch 15 is communicated with the hot water absorber 7 and the hot water condenser 8 in sequence along its water conveyance path; the second branch 16 is communicated with the direct combustion absorber 11 and the direct combustion condenser 12 in sequence along its water conveyance path.
[0030] Working principle: The primary heat supply network water is transported along the primary heat supply network pipeline system 1, and the secondary heat supply network return water is transported along the secondary heat supply network pipeline system 2. The primary heat supply network water and the secondary heat supply network return water first enter the temperature difference type absorption heat exchange unit 3. Specifically, the primary heat supply network water is transported to the first heating section 13, and at this time, the primary heat supply network water directly enters the hot water generator 5. The high-temperature primary heat supply network water serves as the driving source of the hot water generator 5 and undergoes a first temperature reduction in the hot water generator 5. Then, the primary heat supply network water enters the hot water evaporator 6, causing the primary heat supply network water to further cool down, and further extracting the heat of the primary heat supply network water in the hot water evaporator 6. The secondary heat supply network return water is transported to the first branch 15, and at this time, the secondary heat supply network return water directly enters the hot water absorber 7. The hot water absorber 7 performs a first heating on the secondary heat supply network return water on the first branch 15. After the secondary heat supply network return water flows out of the hot water absorber 7, it enters the hot water condenser 8, and the secondary heat supply network return water is secondarily heated in the hot water condenser 8 to form high-temperature secondary heat supply network water. The temperature of the primary heat supply network water output from the hot water evaporator 6 is lower than the temperature of the secondary heat supply network water.
[0031] After that, the primary heat supply network water further flows along the primary heat supply network pipeline system 1 until it reaches the second heating section 14. At this time, the primary heat supply network water enters the direct-fired evaporator 10 of the direct-fired type absorption heat exchange unit 4, that is, after the primary heat supply network water is reduced to a temperature lower than that of the secondary heat supply network water, it enters the direct-fired evaporator 10 for in-depth heat extraction, further reducing the temperature of the primary heat supply network water to form primary heat supply network return water. At the same time, the secondary heat supply network return water further flows along the second branch 16 until it reaches the direct-fired absorber 11, and the secondary heat supply network return water on the second branch 16 is preliminarily heated. When the preliminarily heated secondary heat supply network return water flows out of the direct-fired absorber 11, it enters the direct-fired condenser 12 to further heat the secondary heat supply network return water to form high-temperature secondary heat supply network water.
[0032] After that, the high-temperature secondary heat supply network water of the first branch 15 and the high-temperature secondary heat supply network water of the second branch 16 converge to provide secondary heat supply network water to the heat-using unit. The utility model can fully recover and utilize the heat of the primary heat supply network water, perform multi-stage full heating on the secondary heat supply network return water, widen the temperature difference between the supply and return water of the primary heat supply network, greatly improve the heat transmission capacity of the pipe network, improve the comprehensive energy utilization efficiency of the heating system, save the transmission electricity cost, provide favorable conditions for the waste heat recovery on the heat source side, greatly improve the comprehensive energy utilization efficiency of the heating system, and make the temperature of the secondary heat supply network water as close as possible to the temperature of the primary heat supply network water.
[0033] In one embodiment, the temperature difference type absorption heat exchange unit 3 is a hot water type lithium bromide heat exchange unit; the hot water generator 5 of the hot water type lithium bromide heat exchange unit uses the primary heat network supply water in the primary heat network pipeline system 1 as the driving source (heat source). In the hot water type lithium bromide heat exchange unit, water is used as the refrigerant and lithium bromide is used as the absorbent. During the operation of the hot water type lithium bromide heat exchange unit, when the lithium bromide aqueous solution is heated by the primary heat network supply water in the hot water generator 5, the water in the solution continuously vaporizes; as the water continuously vaporizes, the concentration of the lithium bromide aqueous solution in the hot water generator 5 continuously increases and enters the hot water absorber 7, releasing heat to heat the secondary heat network return water; the water vapor enters the hot water condenser 8 and is condensed after being cooled by the cooling water in the hot water condenser 8, becoming high-pressure and low-temperature liquid water, and releasing a large amount of heat in the hot water condenser 8 to heat the secondary heat network return water; when the water in the hot water condenser 8 enters the hot water evaporator 6 through the throttle valve, it rapidly expands and vaporizes, and absorbs a large amount of heat from the chilled water and the primary heat network supply water in the evaporator during the vaporization process. The low-temperature water vapor enters the hot water absorber 7 and is absorbed by the lithium bromide aqueous solution in the hot water absorber 7, and the solution concentration gradually decreases, and then is pumped back to the hot water generator 5 by the circulation pump to complete the entire cycle. The direct-fired type absorption heat exchange unit 4 is a direct-fired type lithium bromide heat exchange unit. In the direct-fired generator 9 of the direct-fired type lithium bromide heat exchange unit, the combustion of natural gas is used as the driving source, and water is also used as the refrigerant and lithium bromide is used as the absorbent.
[0034] In this embodiment, a driving source inlet is provided on the hot water generator 5, and the driving source inlet is communicated with the first heat supply section 13; the hot water generator 5 directly uses the primary heat network supply water in the primary heat network pipeline system 1 as the driving source to heat the heat exchange working medium in the hot water generator 5 through the primary heat network supply water. A driving source inlet is provided on the direct-fired generator 9, and the driving source inlet is communicated with the gas supply device. The gas supply device can supply gas to the direct-fired generator 9 in real time. The gas supply device is provided with a regulating valve and a switching valve to adjust the magnitude of the gas supply rate and control the on-off of the gas supply.
[0035] In this embodiment, the temperature difference type absorption heat exchange unit 3 further includes a heat exchanger 17, which is communicated with a part of the first heat supply section 13 that is connected between the hot water generator 5 and the hot water evaporator 6. And the primary heat network pipeline system 1 includes a third branch 18, and the third branch 18 is connected in parallel with the first branch 15 and the second branch 16. The heat exchanger 17 is communicated with the first heat supply section 13 and the third branch 18. After the primary heat network supply water in the first heat supply section 13 flows out of the hot water generator 5, it directly enters the heat exchanger 17. In the heat exchanger 17, the primary heat network supply water heats the secondary heat network return water in the third branch 18. During operation, the high-temperature concentrated solution flowing out of the hot water generator 5 can also exchange heat with the low-temperature dilute solution flowing out of the hot water absorber 7 through the heat exchanger 17 to increase the temperature of the dilute solution entering the generator. The heat exchanger 17 is preferably a plate heat exchanger. During operation, the high-temperature section of the primary heat network supply water serves as the drive of the temperature difference type absorption heat exchange unit 3. After the primary heat network supply water is preliminarily cooled in the hot water generator 5, the primary heat network supply water in the medium-temperature section is formed. The primary heat network supply water in the medium-temperature section is the high-temperature heat source of the plate heat exchanger. After the primary heat network supply water undergoes the heat exchange effect of the plate heat exchanger, the primary heat network supply water in the low-temperature section is formed. The primary heat network supply water in the low-temperature section enters the hot water evaporator 6 to deeply utilize the heat of the primary heat network supply water, and almost all of its heat is used for primary heating of the secondary heat network return water on the first branch 15. Through the reverse Carnot cycle principle of the absorption unit, the temperature difference type absorption heat exchange unit 3 uses the first type of absorption heat pump technology to realize the temperature of the primary heat network supply water after passing through the temperature difference type absorption heat exchange unit 3 is lower than the temperature of the secondary heat network supply water through the cascade utilization of heat. Without changing the overall heat supply, the temperature difference between the supply and return water passing through the temperature difference type absorption heat exchange unit 3 is increased, and the temperature of the primary heat network supply water is fully reduced; the effective and sufficient extraction of the heat of the primary heat network supply water is realized.
[0036] After that, the primary heat network supply water cooled by the temperature difference type absorption heat exchange unit 3 enters the direct-fired evaporator 10 for further cooling and heat extraction. Driven by the heat of natural gas combustion, it primarily heats the secondary heat network return water on the second branch 16. The characteristics of the direct-fired heat pump unit are fully utilized to further reduce the temperature of the primary heat network supply and return water, and transfer the heat of the primary heat network supply water and the gas heat to the secondary heat network return water on the second branch 16. In the present utility model, the direct-fired absorption heat exchange unit 4 uses the reverse Carnot cycle of the first type of absorption heat pump technology. The primary heat network supply water cooled by the temperature difference type absorption heat exchange unit 3 enters the direct-fired absorption heat exchange unit 4 for further cooling and heat extraction. The heat of natural gas combustion is used as the high-grade driving heat of the heat pump unit. The two parts of heat primarily heat the secondary heat network return water, which can not only further reduce the temperature of the primary heat network supply water, but also supplement the shortage of the primary heat network heat supply.
[0037] In one embodiment, the primary heat network pipeline system 1 includes a primary heat network supply pipeline 19 and a primary heat network return pipeline 20. The first heating section 13 and the second heating section 14 are located in the primary heat network supply pipeline 19. The primary heat network return pipeline 20 is communicated with the outlet of the second heating section 14. The primary heat network supply water is first transported along the primary heat network supply pipeline 19, and after being sufficiently cooled, it forms low-temperature primary heat network return water, which is then introduced into the primary heat network return pipeline 20. The secondary heat network pipeline system 2 includes a secondary heat network return pipeline 21 and a secondary heat network supply pipeline 22. The first branch 15, the second branch 16, and the third branch 18 are all located in the secondary heat network return pipeline 21. The secondary heat network supply pipeline 22 is communicated with the outlets of the first branch 15, the second branch 16, and the third branch 18. The secondary heat network return water is transported in the secondary heat network return pipeline 21, and after being sufficiently heated, it forms secondary heat network supply water, which is introduced into the secondary heat network supply pipeline 22. During operation, the water discharged from the first branch 15, the second branch 16, and the third branch 18 all converges into the secondary heat network supply pipeline 22, and heat is supplied to the heat-using unit through the secondary heat network supply pipeline 22.
[0038] In this embodiment, the secondary heat network supply pipeline 22 includes a converging section 23 and a post-convergence section 24. The converging section 23 and the post-convergence section 24 are connected end to end, and are connected to the outlets of the first branch 15, the second branch 16, and the third branch 18 through the converging section 23. And the post-convergence section 24 is communicated with the water outlet of the converging section 23, and the other end of the post-convergence section 24 is communicated with the heat-using unit to output secondary heat network supply water to the heat-using unit. A hot water boiler 25 is connected to the post-convergence section 24, and the hot water boiler 25 can be connected in series or in parallel with the post-convergence section 24. During operation, if it is detected that the temperature of the secondary heat network supply water in the post-convergence section 24 is lower than the preset value, the hot water boiler 25 is started. The secondary heat network supply water in the post-convergence section 24 of the secondary heat network supply pipeline 22 can be introduced into the hot water boiler 25, and the hot water boiler 25 heats the secondary heat network supply water, and then re-introduces it into the post-convergence section 24 to increase the temperature and heat supply of the secondary heat network supply water in the secondary heat network supply pipeline 22.
[0039] In this embodiment, the hot water boiler 25 is connected to the gas supply device, and the secondary heat network supply water is heated by the combustion of gas. The hot water boiler 25 is a gas hot water boiler. Preferably, the hot water boiler 25 is connected in parallel with the secondary heat network supply pipeline 22. Specifically, the hot water boiler 25 is connected in parallel with the post-convergence section 24. A regulating valve and a cut-off valve are provided in the gas supply device. The gas supply flow rate can be adjusted through the regulating valve, and the gas supply to the hot water boiler 25 can be closed or opened through the cut-off valve.
[0040] In this embodiment, a power regulating device is provided in the hot water boiler 25. Through the power regulating device, the heating power of the hot water boiler 25 can be regulated, the heating amount of the hot water supplied to the secondary heat network by the hot water boiler 25 can be changed, and the temperature of the hot water supplied to the secondary heat network in the secondary heat network supply pipeline 22 can be regulated.
[0041] In this embodiment, temperature detection devices are provided in both the post-collection section 24 of the secondary heat network supply pipeline 22 and the primary heat network supply pipeline 19. The temperature detection devices are electrically connected to the power regulating device. Preferably, the control system receives the temperature signals from the temperature detection devices and controls the power regulating device in real time to change the heating power of the hot water boiler 25, so as to make the temperature of the hot water supplied to the secondary heat network as close as possible to the temperature of the hot water supplied to the primary heat network.
[0042] Working principle: The hot water supplied to the primary heat network first enters the temperature difference type absorption heat exchange unit 3 to perform primary heating on the secondary heat network return water on the first branch 15 to form the hot water supplied to the secondary heat network. The hot water supplied to the primary heat network after being preliminarily cooled then enters the direct-fired absorption heat exchange unit 4 for in-depth heat extraction to further reduce the temperature of the hot water supplied to the primary heat network. The direct-fired absorption heat exchange unit 4 performs primary heating on the secondary heat network return water on the second branch 16 to form the hot water supplied to the secondary heat network. The hot water supplied to the secondary heat network output from the first branch 15 and the second branch 16 is mixed and then enters the gas hot water boiler 25 for secondary heating to meet the actual temperature requirements of the hot water supplied to the secondary heat network, ensure that the temperature of the hot water supplied to the primary heat network is equal to the temperature of the hot water supplied to the secondary heat network, can significantly reduce the temperature of the return water of the primary heat network, realize widening the temperature difference between the supply and return water of the primary heat network, greatly improve the heat transmission capacity of the pipe network, save the transmission electricity cost, provide favorable conditions for the waste heat recovery on the heat source side, and greatly improve the comprehensive energy utilization efficiency of the heating system.
[0043] It should be noted that for those skilled in the art, it is obvious that the present invention is not limited to the details of the above-mentioned exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic characteristics of the present invention. Therefore, in any aspect, the embodiments should be regarded as exemplary and non-limiting. The scope of the present invention is defined by the appended claims rather than the above description. Therefore, all changes falling within the meaning and scope of the equivalent elements of the claims are intended to be included in the present invention. Any reference signs in the claims should not be regarded as limiting the claims involved.
[0044] Specific examples are used in the present invention to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation to the present invention.
Claims
1. A novel heat network system, comprising a primary heat network pipeline system (1) and a secondary heat network pipeline system (2), characterized in that, It further includes: A temperature difference type absorption heat exchange unit (3), including a hot water generator (5), a hot water evaporator (6), a hot water absorber (7), and a hot water condenser (8); A direct-fired type absorption heat exchange unit (4), including a direct-fired generator (9), a direct-fired evaporator (10), a direct-fired absorber (11), and a direct-fired condenser (12); The primary heat network pipeline system (1) includes a first heating section (13) and a second heating section (14) connected in series successively along the water conveyance direction; the first heating section (13) is successively connected to the hot water generator (5) and the hot water evaporator (6) along the water conveyance direction; the second heating section (14) is connected to the direct-fired evaporator (10); The secondary heat network pipeline system (2) includes a first branch (15) and a second branch (16) connected in parallel; the first branch (15) is successively connected to the hot water absorber (7) and the hot water condenser (8) along the water conveyance direction; the second branch (16) is successively connected to the direct-fired absorber (11) and the direct-fired condenser (12) along the water conveyance direction.
2. The novel heat network system according to claim 1, wherein The temperature difference type absorption heat exchange unit (3) is a hot water type lithium bromide heat exchange unit, and the direct-fired type absorption heat exchange unit (4) is a direct-fired type lithium bromide heat exchange unit.
3. The novel heat network system according to claim 2, characterized in that, The driving source inlet of the hot water generator (5) is connected to the first heating section (13); the driving source inlet of the direct-fired generator (9) is connected to a gas supply device.
4. The novel heat network system according to claim 1, characterized in that, The temperature difference type absorption heat exchange unit (3) further includes a heat exchanger (17), and the heat exchanger (17) is connected to a part of the first heating section (13) between the hot water generator (5) and the hot water evaporator (6); the primary heat network pipeline system (1) includes a third branch (18) connected in parallel with the first branch (15) and the second branch (16); the heat exchanger (17) is connected to the first heating section (13) and the third branch (18).
5. The novel heat network system according to claim 4, characterized in that, The heat exchanger (17) is a plate heat exchanger.
6. The novel heat network system according to claim 4, characterized in that, The primary heat network pipeline system (1) includes a primary heat network water supply pipeline (19) and a primary heat network water return pipeline (20), and the first heating section (13) and the second heating section (14) are located in the primary heat network water supply pipeline (19); the primary heat network water return pipeline (20) is connected to the outlet of the second heating section (14); the secondary heat network pipeline system (2) includes a secondary heat network water return pipeline (21) and a secondary heat network water supply pipeline (22), the first branch (15), the second branch (16), and the third branch (18) are located in the secondary heat network water return pipeline (21), and the outlets of the first branch (15), the second branch (16), and the third branch (18) are all connected to the secondary heat network water supply pipeline (22).
7. The novel heat network system according to claim 6, characterized in that, The secondary heat supply water pipeline (22) includes a collecting section (23) and a post-collecting section (24); the collecting section (23) is communicated with the outlets of the first branch (15), the second branch (16) and the third branch (18); the post-collecting section (24) is communicated with the water outlet end of the collecting section (23), and a hot water boiler (25) is communicated with the post-collecting section (24).
8. The novel heat network system according to claim 7, characterized in that, The hot water boiler (25) is connected in parallel with the post-collecting section (24), and the hot water boiler (25) is communicated with a gas supply device.
9. The novel heat network system according to claim 8, characterized in that, A power adjustment device for adjusting the heating power is arranged in the hot water boiler (25).
10. The novel heat network system according to claim 9, characterized in that, Temperature detection devices are arranged on the post-collecting section (24) of the secondary heat supply water pipeline (22) and the primary heat supply water pipeline (19), and the temperature detection devices are electrically connected with the power adjustment device.