Heat pump system for recovering waste heat for supplementing water to heat supply network

Abstract

The utility model discloses a heat pump system for recovering waste heat for supplementing water for a heat supply network, which is characterized by comprising a heat user, an absorption type large-temperature-difference heat exchanger unit, primary network backwater and primary network water supply, a pipeline at one end of the absorption type large-temperature-difference heat exchange unit is connected with primary network water supply, and a pipeline at the other end of the absorption type large-temperature-difference heat exchange unit is connected with primary network return water; an outlet of the absorption type large-temperature-difference heat exchange unit is connected with an inlet of a heat user through a secondary net water supply pipeline, and an inlet of the absorption type large-temperature-difference heat exchange unit is connected with an outlet of the heat user through a secondary net water return pipeline. The utility model relates to the technical field of waste heat utilization, in particular to a heat pump system for recycling waste heat for heat supply network water replenishing, which recycles primary network return water heat or outdoor air heat by utilizing a carbon dioxide heat pump technology, heats tap water subjected to softening treatment and uses the tap water as heat supply network water replenishing. The water replenishing temperature of a heat supply network is increased; and heat from a power plant is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a waste heat utilization technical field, specifically, relates to a heat pump system that recycles waste heat for heat network water supplement. BACKGROUND

[0002] Electric heat pump technology is to take heat from low-temperature heat source by using electric energy, and transfer the heat to the heated medium, that is, to improve the low-grade heat to high-grade heat for utilization by consuming a small amount of high-grade energy.

[0003] The conventional electric heat pump working medium is mostly hydrofluorocarbon, and with the double-carbon policy, the refrigerant replacement is a very urgent and challenging problem.

[0004] Carbon dioxide, as a natural working medium, has good characteristics and is an environmentally friendly working medium. Carbon dioxide is an inert gas, safe, non-toxic and non-flammable, with good safety and chemical stability, suitable for various lubricating oils and commonly used mechanical part materials, and even at high temperatures, it does not decompose to produce harmful gases; its global warming potential index GWP is 1, and its oxygen layer destruction index ODP is 0; carbon dioxide has high unit volume refrigeration capacity and low kinematic viscosity, and its excellent flow and heat transfer characteristics can significantly reduce the size of the compressor and the system, making the entire system very compact, easy to operate and maintain, and having good economic performance; the critical temperature of carbon dioxide is 31.1℃, and the critical pressure is 7.37MPa; carbon dioxide heat pump usually adopts transcritical cycle, that is, the heat release process is carried out in the supercritical region, without phase change phenomenon, and belongs to the temperature change process, with a large temperature glide, and using counterflow heat exchange, a higher outlet water temperature can be obtained.

[0005] The heat network pipeline needs to be frequently supplemented with water due to pipeline aging, sewage drainage, human factors, etc.

[0006] The conventional heat network water supplement uses tap water, which is directly supplemented to the heat network after softening treatment, with a temperature of about 5-10℃; the tap water supplemented to the heat network system needs to be heated to the average return water temperature of the heat network by the heat source, increasing the heating cost; in an emergency, a large amount of water supplemented to the heat network may reduce the water supply temperature, affecting the experience of heat users; therefore, the heat pump system for recycling waste heat for heat network water supplement is designed to avoid the defect of directly supplementing tap water to increase heat consumption when directly supplementing water to the heat network. INVENTION CONTENTS

[0007] The utility model solves the technical problem to provide a heat pump system that recycles waste heat for heat network water supplement, which recycles the heat of the primary network return water or outdoor air by using carbon dioxide heat pump technology, heats the softened tap water, and supplements the heat network with the tap water, thereby improving the heat network water supplement temperature, reducing the heat extraction amount from the power plant, and overcoming the defects of the existing heat network water supplement technology, directly supplementing tap water, increasing heat consumption, and increasing heating cost.

[0008] The utility model discloses a technical scheme as follows to realize the utility model purposes:

[0009] A kind of heat pump system for recycling waste heat to be used for heat network water replenishment, it is characterized by comprising heat user, absorption large temperature difference heat exchange unit, primary network return water and primary network water supply;

[0010] One end pipeline of the absorption large temperature difference heat exchange unit is connected with primary network water supply, and the other end pipeline of the absorption large temperature difference heat exchange unit is connected with primary network return water;

[0011] The outlet of the absorption large temperature difference heat exchange unit is connected with the inlet of heat user by secondary network water supply pipeline, and the inlet of the absorption large temperature difference heat exchange unit is connected with the outlet of heat user by secondary network return water pipeline.

[0012] As a further limitation of the technical solution, it further includes secondary network water supply, first heat pump, valve and second heat pump, one end of the first heat pump is connected with tap water by pipeline, the other end of the first heat pump is connected with secondary network water supply by pipeline, the first heat pump further forms closed loop with the primary network return water pipeline by pipeline, the pipeline connected with the first heat pump and primary network return water is provided with the valve, one end of the second heat pump is connected with the tap water, and the other end of the second heat pump is connected with the secondary network water supply by pipeline.

[0013] As a further limitation of the technical solution, the first heat pump is carbon dioxide water source heat pump, and the second heat pump is carbon dioxide air source heat pump.

[0014] As a further limitation of the technical solution, it further includes first heat pump and valve, one end of the first heat pump is connected with tap water by pipeline, the other end of the first heat pump is connected with the primary network water supply by pipeline, the first heat pump forms closed loop with the primary network return water pipeline by pipeline, and the pipeline connected with the first heat pump and the primary network return water is provided with the valve.

[0015] As a further limitation of the technical solution, the first heat pump is carbon dioxide water source heat pump.

[0016] As a further limitation of the technical solution, it further includes second heat pump, one end of the second heat pump is connected with tap water by pipeline, and the other end of the second heat pump is connected with the primary network water supply by pipeline.

[0017] As a further limitation of the technical solution, the second heat pump is carbon dioxide air source heat pump.

[0018] Compared with the prior art, the utility model has the advantages and positive effects that:

[0019] 1. Adopting carbon dioxide heat pump technology, recovering once network backwater heat or outdoor air heat, using carbon dioxide transcritical cycle, high exhaust temperature, and large temperature slip characteristics of heat release process, heating the treated tap water, heating 10℃ tap water to 90℃ as heat network make-up water, carbon dioxide heat pump large temperature difference small flow operation mode, plays the advantages of carbon dioxide heat pump, avoids the performance decline problem of carbon dioxide heat pump applied to ordinary heating condition at high backwater temperature;

[0020] 2. Using once network backwater as heat source will further reduce the temperature of once network backwater, creating conditions for power plant waste heat recovery, using air as free heat source to further reduce cost;

[0021] 3. Using carbon dioxide as heat pump working medium, compared with traditional refrigerant, has higher safety, reduces the risk of leakage and fire, by using carbon dioxide heat pump technology to recover once network backwater heat or outdoor air heat, heating the softened tap water as heat network make-up water, improves the heat network make-up water temperature, reduces the heat quantity from the power plant. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical scheme in the utility model or prior art, the following will be briefly introduced the drawings needed to be used in the embodiment or prior art description, obviously, the drawings in the following description is some embodiments of the utility model, for those skilled in the art, without creative labor, can also obtain other drawings according to these drawings.

[0023] Figure 1 It is the structural schematic diagram of the embodiment one of the utility model;

[0024] Figure 2 It is the structural schematic diagram of the embodiment two of the utility model;

[0025] Figure 3 It is the structural schematic diagram of the embodiment three of the utility model.

[0026] Reference signs:

[0027] 1, heat user, 2, absorption type large temperature difference heat exchange unit, 3, first heat pump, 4, valve, 5, second heat pump. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model below, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0029] In the description of the utility model, it is understood that the orientation or position relation indicated by the terms "upper", "lower", "horizontal", "inner", "outer" and the like is the orientation or position relation shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model.

[0030] In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "multiple" is two or more than two, unless otherwise specifically limited.

[0031] When a component is referred to as "on" or "set on" another component, it can be on the other component or can exist simultaneously with a middle component. When a component is referred to as "connected to" another component, it can be directly connected to the other component or can exist simultaneously with a middle component.

[0032] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the technical scheme in the utility model will be described clearly and completely in combination with the drawings in the utility model below, obviously, the described embodiments are part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the ordinary skilled in the art without making creative labor belong to the scope of protection of the utility model.

[0033] Embodiment one: a heat pump system for recycling waste heat for heat network water replenishment, comprising a heat user 1, an absorption type large temperature difference heat exchange unit 2, primary network return water and primary network water supply;

[0034] One end pipeline of the absorption type large temperature difference heat exchange unit 2 is connected with the primary network water supply, and the other end pipeline of the absorption type large temperature difference heat exchange unit 2 is connected with the primary network return water;

[0035] The outlet of the absorption type large temperature difference heat exchange unit 2 is connected with the inlet of the heat user 1 through the secondary network water supply pipeline, and the inlet of the absorption type large temperature difference heat exchange unit 2 is connected with the outlet of the heat user 1 through the secondary network return water pipeline.

[0036] The system further comprises secondary network water supply, the first heat pump 3, the valve 4 and the second heat pump 5, one end of the first heat pump 3 is connected with tap water through a pipeline, the other end of the first heat pump 3 is connected with the secondary network water supply through a pipeline, the first heat pump 3 further forms a closed loop with the primary network return water pipeline through a pipeline, the pipeline connecting the first heat pump 3 and the primary network return water is provided with the valve 4, one end of the second heat pump 5 is connected with tap water, the other end of the second heat pump 5 is connected with the secondary network water supply through a pipeline.

[0037] The first heat pump 3 is a carbon dioxide water source heat pump, and the second heat pump 5 is a carbon dioxide air source heat pump.

[0038] In the embodiment, the first heat pump 3 or the second heat pump 5 is arranged in the heat station, the heat station adopts the absorption type large temperature difference heat exchange unit 2, the primary network return water is cooled to about 20 DEG C after heat exchange through the absorption type large temperature difference heat exchange unit 2, and then is further cooled by the first heat pump 3 and returned to the power plant, which is helpful to further recover the waste heat in the power plant, and meanwhile, the first heat pump 3 heats the 10 DEG C tap water to 90 DEG C, and the tap water is supplied to the heat user 1 as secondary network water supply through a pipeline.

[0039] The second heat pump 5 consumes a small amount of electric energy, absorbs outdoor air heat, heats the 10 DEG C tap water to 90 DEG C, and supplies the tap water to the heat user 1 as secondary network water supply through a pipeline.

[0040] In use, the first heat pump 3 is started, carbon dioxide is used as working medium, heat is absorbed from the primary network return water, and tap water is heated;

[0041] The closed loop of the first heat pump 3 and the primary network return water pipeline is controlled through the valve 4, so as to adjust the water flow entering the first heat pump 3;

[0042] The second heat pump 5 is started, carbon dioxide is used as working medium, heat is absorbed from the air, and tap water is heated;

[0043] The heat of the primary network return water is transmitted to the secondary network water supply through the first heat pump 3, so as to realize heat recycling;

[0044] The heat user 1 obtains required heat through heat exchange with the primary network water supply through the absorption type large temperature difference heat exchange unit 2.

[0045] Embodiment two: a heat pump system for recycling waste heat to supply water to a heat network, characterized in that the system comprises a heat user 1, an absorption type large temperature difference heat exchange unit 2, primary network return water and primary network water supply.

[0046] One end of the absorption type large temperature difference heat exchange unit 2 is connected with the primary network water supply through a pipeline, and the other end of the absorption type large temperature difference heat exchange unit 2 is connected with the primary network return water through a pipeline.

[0047] Further comprising a first heat pump 3 and a valve 4, one end of the first heat pump 3 is connected with tap water through a pipeline, the other end of the first heat pump 3 is connected with primary network water supply through a pipeline, the first heat pump 3 forms a closed loop with the primary network return water pipeline through a pipeline, and the pipeline connected with the primary network return water of the first heat pump 3 is provided with the valve 4.

[0048] The first heat pump 3 is a carbon dioxide water source heat pump.

[0049] In this embodiment, the first heat pump 3 is arranged in the power plant, the heat station adopts the absorption type large temperature difference heat exchange unit 2, the primary network return water is cooled to about 20 DEG C after heat exchange through the absorption type large temperature difference heat exchange unit 2, and then is further cooled by the first heat pump 3 and returned to the power plant, which is helpful to further recover the waste heat in the power plant, and the first heat pump 3 heats the 10 DEG C tap water to 90 DEG C, which is further heated by the sharp peak heater and used as the primary network water supply.

[0050] In use, the first heat pump 3 is started, which is a carbon dioxide water source heat pump, used for extracting heat from the primary network return water and heating tap water;

[0051] The valve 4 is adjusted to control the closed loop of the first heat pump 3 and the primary network return water pipeline, so as to ensure the water flow entering the first heat pump 3;

[0052] Through the first heat pump 3, the heat of the primary network return water is transferred to the primary network water supply, so as to realize the recycling of heat;

[0053] The heat user 1 obtains the required heat through the heat exchange between the absorption type large temperature difference heat exchange unit 2 and the primary network water supply.

[0054] Embodiment three: a heat pump system for recycling waste heat to supply water for a heat network, characterized in that it comprises a heat user 1, an absorption type large temperature difference heat exchange unit 2, primary network return water and primary network water supply;

[0055] One end of the absorption type large temperature difference heat exchange unit 2 is connected with the primary network water supply through a pipeline, and the other end of the absorption type large temperature difference heat exchange unit 2 is connected with the primary network return water through a pipeline.

[0056] Further comprising a second heat pump 5, one end of the second heat pump 5 is connected with tap water through a pipeline, and the other end of the second heat pump 5 is connected with the primary network water supply through a pipeline.

[0057] The second heat pump 5 is a carbon dioxide air source heat pump.

[0058] In this embodiment, the second heat pump 5 is arranged in the power plant, the second heat pump 5 consumes a small amount of electric energy, absorbs outdoor air heat, heats the 10 DEG C tap water to 90 DEG C, and further heats the tap water by the sharp peak heater to be used as the primary network water supply.

[0059] In use, the second heat pump 5 is started, and the second heat pump 5 is a carbon dioxide air source heat pump, which is used for extracting heat from air and heating tap water;

[0060] The heat user 1 obtains required heat through heat exchange between the heat absorption type large temperature difference heat exchange unit 2 and the primary network supply water.

[0061] In conclusion, the utility model adopts carbon dioxide heat pump technology, uses carbon dioxide transcritical cycle, high exhaust temperature, and the characteristics of large temperature slip in heat release process, heats 10 DEG C tap water to 90 DEG C, and is used for heat network water supplement, and the heat source can adopt primary network return water or outdoor air, and the primary network return water is used as the heat source, which can further reduce the primary network return water temperature, creates conditions for power plant waste heat recovery, and the outdoor air is used as the heat source, and the heat source is free, theoretically calculates, the primary network return water temperature is 20 DEG C, the carbon dioxide heat pump inlet water temperature is 10 DEG C, the outlet water temperature is 90 DEG C, the heat pump heating COP is 4.1, the heat supply cost is 63 yuan / GJ by integrating power plant heat recovery cost (30 yuan / GJ) and electricity cost (0.6kW.h), the outdoor environment temperature is -10 DEG C, the carbon dioxide heat pump inlet water temperature is 10 DEG C, the outlet water temperature is 90 DEG C, the heat pump heating COP is 2.8, compared with the primary network return water, only the electric energy is consumed, and the heat supply cost is 60 yuan / GJ.The application avoids the problem that the carbon dioxide heat pump is applied to ordinary heating system, and the system performance deteriorates when the return water temperature is high.

[0062] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the utility model.

Claims

1. A heat pump system for recovering waste heat for heat network make-up, characterized in that, It comprises a heat user (1), an absorption large temperature difference heat exchange unit (2), primary network return water and primary network supply water; One end of the absorption large temperature difference heat exchange unit (2) is connected with the primary network supply water through a pipeline, and the other end of the absorption large temperature difference heat exchange unit (2) is connected with the primary network return water through a pipeline; The outlet of the absorption large temperature difference heat exchange unit (2) is connected with the inlet of the heat user (1) through a secondary network supply water pipeline, and the inlet of the absorption large temperature difference heat exchange unit (2) is connected with the outlet of the heat user (1) through a secondary network return water pipeline.

2. The heat pump system of claim 1, wherein, It further comprises secondary network supply water, a first heat pump (3), a valve (4) and a second heat pump (5), one end of the first heat pump (3) is connected with tap water through a pipeline, the other end of the first heat pump (3) is connected with the secondary network supply water through a pipeline, the first heat pump (3) further forms a closed loop with the primary network return water pipeline through a pipeline, the valve (4) is arranged on the pipeline connected with the primary network return water, one end of the second heat pump (5) is connected with the tap water, and the other end of the second heat pump (5) is connected with the secondary network supply water through a pipeline.

3. A heat pump system for recovering waste heat for heat supply network make-up water according to claim 2, characterized in that, The first heat pump (3) is a carbon dioxide water source heat pump, and the second heat pump (5) is a carbon dioxide air source heat pump.

4. The heat pump system of claim 1, wherein, It further comprises a first heat pump (3) and a valve (4), one end of the first heat pump (3) is connected with tap water through a pipeline, the other end of the first heat pump (3) is connected with the primary network supply water through a pipeline, the first heat pump (3) forms a closed loop with the primary network return water pipeline through a pipeline, and the valve (4) is arranged on the pipeline connected with the primary network return water.

5. A heat pump system for recovering waste heat for heat supply network make-up water according to claim 4, characterized in that, The first heat pump (3) is a carbon dioxide water source heat pump.

6. The heat pump system of claim 1, wherein, It further comprises a second heat pump (5), one end of the second heat pump (5) is connected with tap water through a pipeline, and the other end of the second heat pump (5) is connected with the primary network supply water through a pipeline.

7. A heat pump system for recovering waste heat for heat supply network make-up water according to claim 6, characterized in that, The second heat pump (5) is a carbon dioxide air source heat pump.

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