Medium-temperature waste heat heating heat pump

Abstract

The utility model provides a medium-temperature waste heat heating heat pump, and relates to the technical field of heat pumps. Comprising a waste heat water pipe, an evaporator, an absorber, a water-water heat exchanger, a generator, a condenser and a solution heat exchanger, an inlet of the waste heat water pipe is located on one side of the evaporator or the water-water heat exchanger, and after the waste heat water pipe passes through the evaporator, the water-water heat exchanger and the generator, an outlet of the waste heat water pipe is led out from one side of the generator; the absorber is communicated with the evaporator, and a heat supply network water pipe sequentially passes through the water-water heat exchanger and the absorber, so that heat supply network water flows out after absorbing heat and is used for heat supply of a heat supply network; the generator is in two-way communication with the absorber through the solution heat exchanger, the condenser is communicated with the generator, cooling water is introduced into the condenser to cool refrigerant steam introduced into the condenser through the generator, and refrigerant water generated in the condenser flows to the evaporator through throttling pressure reduction. The heat pump can improve the utilization efficiency of waste heat of hot water, consumes a small amount of electric energy and reduces heat loss.

Description

Technical Field

[0001] The utility model relates to the technical field of heat pumps, in particular to a medium-temperature waste heat heating heat pump. Background Art

[0002] Process cooling in the petroleum, chemical, steel, and nonferrous metals industries generates low-temperature wastewater at 60-70°C. This low-grade wastewater has a high flow rate and is difficult to efficiently recycle. This low-grade wastewater is used for winter heating in northern China, typically through direct heat exchangers. However, this direct heat exchange method results in a temperature difference of approximately 10°C in the recovered water, resulting in low heat recovery. This low-grade wastewater is often utilized in heat pump units, consuming at least 25% of electrical energy or at least 60% of steam (or gas) energy.

[0003] The current existing heating methods mainly include: water-to-water heat exchange heating, electric compression heat pump heating, lithium bromide heating heat pump, and lithium bromide heating heat pump heating. Among them, water-to-water heat exchange uses waste hot water to heat the heating water; electric compression heat pump heating uses an electric compression heat pump unit, which uses a compressor to compress the Freon refrigerant to recover low-temperature waste hot water and produce high-temperature hot water or steam; lithium bromide heating heat pump uses steam, high-temperature hot water, gas and other media as drive, which requires the consumption of high-grade energy, recovers low-temperature waste heat, and produces heating water or make-up water not higher than 95°C; lithium bromide heating heat pump uses medium-temperature waste heat above 90°C to produce high-temperature hot water or steam, and the waste heat recovery efficiency is low.

[0004] However, the above heating method has the following problems: 1. The water-to-water heat exchanger has heat exchange end difference loss and cannot exchange heat higher than the low-temperature waste heat. That is, the cold end water temperature cannot be higher than the hot end water temperature. For heating, if the cold end heat network inlet water is 50℃, the hot end water outlet can only be higher than 50℃, usually resulting in a 5℃ end difference loss.

[0005] 2. Electric compression heat pumps: Extracting heat from low-temperature waste water requires a large amount of electricity to raise the temperature of the heating network water. This is also limited by the refrigerant and heating pressure levels, making them expensive. If heat is extracted from water at 60-70°C to around 100°C, the energy efficiency reaches a maximum of 4.0. Furthermore, the heating temperature rise of a single unit is small, limiting the total heating capacity. Electric compression heat pumps, when used for high-load heating, consume a significant amount of electricity, making it difficult to meet the demand for increased power capacity.

[0006] 3. Lithium bromide heat-increasing heat pumps need to use high-temperature steam, gas, high-temperature hot water, etc. to recover the heat of low-temperature waste water. They consume high-grade steam or gas, and the energy investment cost is relatively high. For heating, it generally consumes 60% of high-grade energy and recovers about 40% of low-grade waste heat.

[0007] 4. Lithium bromide heating type heat pump mainly recovers waste hot water or exhaust steam above 90℃, and produces higher temperature hot water or steam under the action of cooling water at about 30℃. This equipment is mainly used to produce industrial steam and has an efficiency of less than 50%.

[0008] In view of the above reasons, the present invention proposes a medium-temperature waste heat heating heat pump, which can maximize the use of hot water waste heat, consume a small amount of electricity, and achieve maximum utilization of heat. Utility Model Content

[0009] The purpose of the utility model is to provide a medium-temperature waste heat heating heat pump, which can improve the utilization efficiency of waste heat of hot water, consume a small amount of electricity, and reduce heat loss.

[0010] The utility model provides a medium-temperature waste heat heating heat pump, comprising: a waste heat water pipe, an evaporator, an absorber, a water-to-water heat exchanger, a generator, a condenser, and a solution heat exchanger. The inlet of the waste heat water pipe is located on one side of the evaporator or the water-to-water heat exchanger. After the waste heat water pipe passes through the evaporator, the water-to-water heat exchanger, and the generator, its outlet is led out from one side of the generator.

[0011] The absorber is connected to the evaporator, and the water pipe of the heating network passes through the water-to-water heat exchanger and the absorber in sequence, so that the water in the heating network absorbs heat and flows out to be used for heating the heating network;

[0012] The generator is bidirectionally connected to the absorber through the solution heat exchanger, the condenser is connected to the generator, cooling water flows into the condenser, and the refrigerant water of the condenser flows to the evaporator through throttling and pressure reduction.

[0013] Preferably, the inlet of the waste heat water pipe is connected to a three-way regulating valve, and the three-way regulating valve is connected to the first branch pipe and the second branch pipe respectively passing through the evaporator and the water-to-water heat exchanger. The ends of the first branch pipe and the second branch pipe are merged and pass through the generator, and the outlet of the waste heat water pipe is located on the external side of the generator.

[0014] Preferably, the inlet of the waste heat water pipe is located outside the evaporator, and the waste heat water pipe passes through the evaporator, the water-to-water heat exchanger and the generator in sequence.

[0015] Preferably, the inlet of the waste hot water pipe is located outside the water-to-water heat exchanger, and the waste hot water pipe passes through the water-to-water heat exchanger, the evaporator and the generator in sequence.

[0016] Preferably, the inlet of the heating network water pipe is located outside the water-to-water heat exchanger, the heating network water pipe passes through the water-to-water heat exchanger and the absorber in sequence, and the outlet of the heating network water pipe is located outside the absorber.

[0017] Preferably, the hot network water pipe is provided with a first inlet and a second inlet, the first inlet is located outside the water-to-water heat exchanger, and the second inlet is located outside the absorber. Part of the hot network water enters the water-to-water heat exchanger through the first inlet to exchange heat with the waste hot water, and then mixes with another part of the hot network water that enters the absorber through the second inlet and is heated, and then flows out from the outlet of the hot network water pipe located outside the absorber.

[0018] Preferably, the bottom solution outlet of the evaporator is connected to the spray pipe at the top thereof through a circulation pump.

[0019] Preferably, the concentrated solution outlet of the solution heat exchanger is connected to the spray pipe at the top of the absorber through a concentrated solution pump.

[0020] Preferably, the dilute solution outlet at the bottom of the absorber is connected to the dilute solution inlet of the solution heat exchanger through a dilute solution pump.

[0021] Preferably, cooling water is introduced into the tube side of the condenser through a cooling water pipe.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. This heat pump can adapt to different working conditions according to the changes in outdoor temperature in winter, and is suitable for heating needs throughout the entire heating season in the northern cold regions;

[0024] 2. It can efficiently recover waste heat from hot water, reduce the input of other energy sources such as electricity or natural gas, and improve the utilization rate of waste heat;

[0025] 3. Under the condition of recovering the same amount of waste heat, the utility model heat pump has low equipment investment and short payback period;

[0026] 4. This utility model utilizes the low temperature environment in the cold northern regions and solves the problem of high energy consumption for heating in the north in winter and inability to fully utilize low-temperature waste heat through the innovative combination of a water-to-water heat exchanger and a lithium bromide heating heat pump unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 This is a structural principle diagram of a medium-temperature waste heat heating heat pump according to the first embodiment of the present invention;

[0029] Figure 2 This is a structural principle diagram of a medium-temperature waste heat heating heat pump according to the second embodiment of the present invention;

[0030] Figure 3 This is a structural principle diagram of a medium-temperature waste heat heating heat pump according to the third embodiment of the present invention;

[0031] Figure 4 This is a structural principle diagram of a medium-temperature waste heat heating heat pump according to the fourth embodiment of the present utility model;

[0032] Figure 5 This is a structural principle diagram of a medium-temperature waste heat heating heat pump according to a fifth embodiment of the present invention;

[0033] Description of reference numerals:

[0034] 1: Three-way regulating valve; 2: Evaporator; 3: Water-to-water heat exchanger; 4: Generator; 5: Condenser; 6: Absorber; 7: Solution heat exchanger; 8: Dilute solution pump; 9: Concentrated solution pump; 10: Circulation pump; 11: Waste water pipe; 12: Heating network water pipe. DETAILED DESCRIPTION

[0035] The following will clearly and completely describe the technical solutions of the present invention in conjunction with the embodiments. Obviously, the embodiments described are only a part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present invention.

[0037] In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present utility model, "multiple" means two or more, unless otherwise clearly and specifically defined. In addition, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a communication between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to the specific circumstances.

[0038] Example 1

[0039] like Figure 1 As shown, this embodiment provides a medium-temperature waste heat heating heat pump, including: a waste heat water pipe 11, an evaporator 2, an absorber 6, a water-to-water heat exchanger 3, a generator 4, a condenser 5, and a solution heat exchanger 7. The inlet of the waste heat water pipe 11 is located on one side of the evaporator 2 or the water-to-water heat exchanger 3. After the waste heat water pipe 11 passes through the evaporator 2, the water-to-water heat exchanger 3, and the generator 4, its outlet is led out from one side of the generator 4. The waste heat water pipe 11 is filled with low-temperature waste water at 60-70°C generated by process cooling in the fields of petroleum, chemical industry, steel, non-ferrous metals, etc., which serves as the main heat source for the heating network water.

[0040] The absorber 6 is connected to the evaporator 2, and the heat network water pipe 12 passes through the water-to-water heat exchanger 3 and the absorber 6 in sequence, so that the heat network water flows out after absorbing the residual heat in the water-to-water heat exchanger 3 and the heat in the absorber 6, and is used for heating the heat network;

[0041] Generator 4 is in bidirectional communication with absorber 6 via solution heat exchanger 7. Condenser 5 is connected to generator 4, and cooling water flows into condenser 5. The condensed water outlet of condenser 5 is connected to evaporator 2. The heat pump of this embodiment combines a traditional lithium bromide heating heat pump with a water-to-water heat exchanger 3. The unit utilizes a large temperature potential energy difference between waste hot water and low-temperature cooling water. This large temperature potential energy difference generates hot water at a temperature that is at least 20°C higher than the waste hot water. For example, the heating temperature can utilize medium-temperature waste hot water at a slightly lower temperature of approximately 60°C to 70°C, and can supply hot water at a temperature approximately 20°C higher than the medium-temperature waste hot water. This makes it suitable for use in the lower ambient temperatures of cold northern regions during winter.

[0042] In this embodiment, the inlet of the waste heat water pipe 11 is connected to a three-way regulating valve 1, and the two ports of the three-way regulating valve 1 are connected to the first branch pipe and the second branch pipe passing through the evaporator 2 and the water-to-water heat exchanger 3 respectively. The ends of the first branch pipe and the second branch pipe are merged and pass through the generator 4. The outlet of the waste heat water pipe 11 is located on the external side of the generator.

[0043] In this embodiment, the heating network water pipe 12 is provided with a first inlet and a second inlet. The first inlet is located outside the water-to-water heat exchanger 3 , and the second inlet is located outside the absorber 6 .

[0044] The waste hot water enters the unit in two ways through the three-way regulating valve 1. One way enters the evaporator 2 of the unit, heats the refrigerant in the evaporator 2 to generate refrigerant vapor that enters the absorber 6; the other way enters the water-to-water heat exchanger 3 to exchange heat with the hot network water, giving the hot network water a preliminary temperature increase. After that, the two ways of waste hot water are mixed and enter the generator 4 to heat the lithium bromide solution in the generator 4. After cooling, the waste hot water is discharged. The refrigerant vapor in the generator 4 enters the condenser 5 for condensation. The condensed refrigerant solution flows to the evaporator 2 through throttling and pressure reduction, realizing the circulation of the refrigerant; the hot network water is preliminarily heated through the water-to-water heat exchanger 3 and enters the absorber 6. The refrigerant solution in the absorber uses a concentrated lithium bromide solution. The concentrated solution absorbs water and releases heat inside it, heating the hot network water. After absorbing heat, the hot network water is used for heating the hot network.

[0045] In this embodiment, the solution outlet at the bottom of evaporator 2 is connected to the spray pipe at the top of the evaporator 2 via a circulation pump 10. The concentrated solution outlet of solution heat exchanger 7 is connected to the spray pipe at the top of absorber 6 via a concentrated solution pump 9. The dilute solution outlet at the bottom of absorber 6 is connected to the dilute solution inlet of solution heat exchanger 7 via a dilute solution pump 8. This structure further provides power for the circulation of the refrigerant solution. In this embodiment, cooling water is introduced into the tube side of condenser 5 via a cooling water pipe, and the refrigerant solution is introduced into the shell side of condenser 5, achieving heat exchange between the two via a shell-and-tube structure.

[0046] For example, in winter, in an area with an average daily outdoor temperature of -20°C, using 70°C medium-temperature wastewater as an example: During the early to late cold season of winter heating, when the outdoor temperature is around 0-15°C, the cooling water temperature entering the unit is between 10°C and 12°C. Based on the required temperature of the unit's outlet hot water, the unit's three-way regulating valve 1 automatically adjusts the flow of wastewater into evaporator 2 and water-to-water heat exchanger 3. During this heating period, when the cooling water temperature is high and the unit is supplying hot water above 90°C, when the cooling water inlet temperature is between 10-12°C or even 15°C, the three-way regulating valve 1 controls the flow rate of water into evaporator 2 at a high level and that into water-to-water heat exchanger 3 at a low level.

[0047] During moderate and severe cold periods, the average outdoor temperature remains below 0°C, and the cooling water temperature entering the unit is between 5°C and 7°C. To maintain the required temperature of the heat network water at the unit's outlet, the unit's three-way regulating valve 1 automatically adjusts the flow of wastewater into the evaporator 2 and the water-to-water heat exchanger 3. During this heating period, the cooling water temperature is low. To ensure that the unit supplies heat network water above 90°C, the wastewater flow into the evaporator must be kept low, while the flow into the water-to-water heat exchanger must be kept high.

[0048] The waste water entering the evaporator 2 and the waste water exchanged with the hot water in the water-to-water heat exchanger 3 are finally mixed and enter the generator 4. After the waste water releases heat in the generator 4, it drops to below 40°C and is discharged;

[0049] After initial heating in water-to-water heat exchanger 3, the water in the heating network enters absorber 6 for further heating, reaching the required temperature before being delivered. Driven by wastewater at a low temperature of 70°C, the unit ensures that the water supply temperature meets the heating network's requirements throughout the heating season, and can reach temperatures above 90°C during severe cold spells.

[0050] Example 2

[0051] like Figure 2 As shown, this embodiment provides a medium-temperature waste heat heating heat pump, including: a waste heat water pipe 11, an evaporator 2, an absorber 6, a water-to-water heat exchanger 3, a generator 4, a condenser 5, and a solution heat exchanger 7. The inlet of the waste heat water pipe 11 is located on one side of the evaporator 2 or the water-to-water heat exchanger 3. After the waste heat water pipe 11 passes through the evaporator 2, the water-to-water heat exchanger 3, and the generator 4, its outlet is led out from one side of the generator 4. The waste heat water pipe 11 is filled with low-temperature waste water at 60-70°C generated by process cooling in the fields of petroleum, chemical industry, steel, non-ferrous metals, etc., which serves as the main heat source for the heating network water.

[0052] The absorber 6 is connected to the evaporator 2, and the heat network water pipe 12 passes through the water-to-water heat exchanger 3 and the absorber 6 in sequence, so that the heat network water flows out after absorbing the residual heat in the water-to-water heat exchanger 3 and the heat in the absorber 6, and is used for heating the heat network;

[0053] Generator 4 is in bidirectional communication with absorber 6 via solution heat exchanger 7. Condenser 5 is also connected to generator 4. Cooling water flows into condenser 5. The refrigerant water in condenser 5 is throttled and depressurized before flowing to evaporator 2. This embodiment's heat pump combines a traditional lithium bromide heating heat pump with a water-to-water heat exchanger 3. This allows it to utilize slightly cooler, medium-temperature wastewater (around 60°C to 70°C) and supply hot water to the heating network at a temperature approximately 20°C higher than the medium-temperature wastewater. This makes it suitable for use in cold northern regions during the winter months, where the ambient temperatures are relatively low.

[0054] In this embodiment, the inlet of the waste heat water pipe 11 is connected to a three-way regulating valve 1, and the two ports of the three-way regulating valve 1 are connected to the first branch pipe and the second branch pipe passing through the evaporator 2 and the water-to-water heat exchanger 3 respectively. The ends of the first branch pipe and the second branch pipe are merged and pass through the generator 4. The outlet of the waste heat water pipe 11 is located on the external side of the generator.

[0055] In this embodiment, the inlet of the heating network water pipe 12 is located outside the water-to-water heat exchanger 3 , the heating network water pipe 12 passes through the water-to-water heat exchanger 3 and the absorber 6 in sequence, and the outlet of the heating network water pipe 12 is located outside the absorber 6 .

[0056] The waste hot water enters the unit in two ways through the three-way regulating valve 1. One way enters the evaporator 2 of the unit, heats the refrigerant in the evaporator 2 to generate refrigerant vapor that enters the absorber 6; the other way enters the water-to-water heat exchanger 3 to exchange heat with the hot network water, giving the hot network water a preliminary temperature increase. After that, the two ways of waste hot water are mixed and enter the generator 4 to heat the lithium bromide solution in the generator 4. After cooling, the waste hot water is discharged. The refrigerant vapor in the generator 4 enters the condenser 5, exchanges heat with the cooling water through the shell and tube structure to form refrigerant water, and flows to the evaporator 2 through throttling and pressure reduction; part of the hot network water enters the water-to-water heat exchanger 3 from the first inlet to exchange heat with the waste hot water, and then enters the absorber 6 from the second inlet. The concentrated lithium bromide solution in the absorber 6 absorbs water and releases heat, heating the hot network water. After heating, it mixes with another part of the hot network water and flows out from the outlet of the hot network water pipe 12 located outside the absorber 6 for heating the hot network.

[0057] In this embodiment, the solution outlet at the bottom of the evaporator 2 is connected to the spray pipe at the top thereof via a circulation pump 10, and the concentrated solution outlet of the solution heat exchanger 7 is connected to the spray pipe at the top of the absorber 6 via a concentrated solution pump 9. The dilute solution outlet at the bottom of the absorber 6 is connected to the dilute solution inlet of the solution heat exchanger 7 via a dilute solution pump 8. This structure provides power for the circulation of the refrigerant solution.

[0058] Example 3

[0059] like Figure 3 As shown, this embodiment provides a medium-temperature waste heat heating heat pump, including: a waste heat water pipe 11, an evaporator 2, an absorber 6, a water-to-water heat exchanger 3, a generator 4, a condenser 5, and a solution heat exchanger 7. The inlet of the waste heat water pipe 11 is located on one side of the evaporator 2 or the water-to-water heat exchanger 3. After the waste heat water pipe 11 passes through the evaporator 2, the water-to-water heat exchanger 3, and the generator 4, its outlet is led out from one side of the generator 4. The waste heat water pipe 11 is filled with low-temperature waste water at 60-70°C generated by process cooling in the fields of petroleum, chemical industry, steel, non-ferrous metals, etc., which serves as the main heat source for the heating network water.

[0060] The absorber 6 is connected to the evaporator 2, and the heat network water pipe 12 passes through the water-to-water heat exchanger 3 and the absorber 6 in sequence, so that the heat network water flows out after absorbing the residual heat in the water-to-water heat exchanger 3 and the heat in the absorber 6, and is used for heating the heat network;

[0061] Generator 4 is in bidirectional communication with absorber 6 via solution heat exchanger 7. Condenser 5 is also connected to generator 4. Cooling water flows into condenser 5. The refrigerant water in condenser 5 is throttled and depressurized before flowing to evaporator 2. This embodiment's heat pump combines a traditional lithium bromide heating heat pump with a water-to-water heat exchanger 3. This allows it to utilize slightly cooler, medium-temperature wastewater (around 60°C to 70°C) and supply hot water to the heating network at a temperature approximately 20°C higher than the medium-temperature wastewater. This makes it suitable for use in cold northern regions during the winter months, where the ambient temperatures are relatively low.

[0062] In this embodiment, the inlet of waste heat water pipe 11 is located outside of evaporator 2. Waste heat water pipe 11 sequentially passes through evaporator 2, water-to-water heat exchanger 3, and generator 4. The inlet of heating network water pipe 12 is located outside of water-to-water heat exchanger 3. It sequentially passes through water-to-water heat exchanger 3 and absorber 6, and its outlet is located outside of absorber 6. Waste heat water first heats the refrigerant in evaporator 2 to produce refrigerant vapor, which enters absorber 6. This refrigerant vapor then enters water-to-water heat exchanger 3 to exchange heat with heating network water, initially raising the heating network water temperature. The waste heat then enters generator 4, heating the lithium bromide solution within generator 4. After cooling, it is discharged. The refrigerant vapor within generator 4 enters condenser 5, condensing the refrigerant solution. The condensed refrigerant solution is throttled and depressurized before flowing to evaporator 2, completing the refrigerant circulation process. The heating network water is initially heated by water-to-water heat exchanger 3 before entering absorber 6. The concentrated lithium bromide solution within absorber 6 absorbs water and releases heat, while the heating network water absorbs heat and flows out, being used for heating the heating network.

[0063] In this embodiment, the solution outlet at the bottom of the evaporator 2 is connected to the spray pipe at the top thereof via a circulation pump 10, and the concentrated solution outlet of the solution heat exchanger 7 is connected to the spray pipe at the top of the absorber 6 via a concentrated solution pump 9. The dilute solution outlet at the bottom of the absorber 6 is connected to the dilute solution inlet of the solution heat exchanger 7 via a dilute solution pump 8. This structure provides power for the circulation of the refrigerant solution.

[0064] Example 4

[0065] like Figure 4As shown, this embodiment provides a medium-temperature waste heat heating heat pump, including: a waste heat water pipe 11, an evaporator 2, an absorber 6, a water-to-water heat exchanger 3, a generator 4, a condenser 5, and a solution heat exchanger 7. The inlet of the waste heat water pipe 11 is located on one side of the evaporator 2 or the water-to-water heat exchanger 3. After the waste heat water pipe 11 passes through the evaporator 2, the water-to-water heat exchanger 3, and the generator 4, its outlet is led out from one side of the generator 4. The waste heat water pipe 11 is filled with low-temperature waste water at 60-70°C generated by process cooling in the fields of petroleum, chemical industry, steel, non-ferrous metals, etc., which serves as the main heat source for the heating network water.

[0066] The absorber 6 is connected to the evaporator 2, and the heat network water pipe 12 passes through the water-to-water heat exchanger 3 and the absorber 6 in sequence, so that the heat network water flows out after absorbing the residual heat in the water-to-water heat exchanger 3 and the heat in the absorber 6, and is used for heating the heat network;

[0067] Generator 4 is in bidirectional communication with absorber 6 via solution heat exchanger 7. Condenser 5 is also connected to generator 4. Cooling water flows into condenser 5. The refrigerant water in condenser 5 is throttled and depressurized before flowing to evaporator 2. This embodiment's heat pump combines a traditional lithium bromide heating heat pump with a water-to-water heat exchanger 3. This allows it to utilize slightly cooler, medium-temperature wastewater (around 60°C to 70°C) and supply hot water to the heating network at a temperature approximately 20°C higher than the medium-temperature wastewater. This makes it suitable for use in cold northern regions during the winter months, where the ambient temperatures are relatively low.

[0068] In this embodiment, the inlet of the waste hot water pipe 11 is located outside the evaporator 2, and the waste hot water pipe 11 passes through the evaporator 2, the water-to-water heat exchanger 3 and the generator 4 in sequence. The inlet of the hot network water pipe 12 is located outside the water-to-water heat exchanger 3, and the hot network water pipe 12 is provided with a first inlet and a second inlet. The first inlet is located outside the water-to-water heat exchanger 3, and the second inlet is located outside the absorber 6. The waste hot water first heats the refrigerant in the evaporator 2 to generate refrigerant vapor which enters the absorber 6, and then enters the water-to-water heat exchanger 3 to exchange heat with the hot network water, giving the hot network water a preliminary temperature increase. After that, the waste hot water enters the generator 4, heats the lithium bromide solution in the generator 4, and is discharged after cooling. The refrigerant vapor in the generator 4 enters the condenser 5 for condensation, and the condensed refrigerant solution flows to the evaporator 2 through throttling and pressure reduction, realizing the circulation of the refrigerant; part of the hot network water enters the water-to-water heat exchanger 3 from the first inlet to exchange heat with the waste hot water, and then mixes with another part of the hot network water that has been heated after entering the absorber 6 from the second inlet, and then flows out from the outlet of the hot network water pipe 12 located outside the absorber 6 for heating the hot network.

[0069] In this embodiment, the solution outlet at the bottom of the evaporator 2 is connected to the spray pipe at the top thereof via a circulation pump 10, and the concentrated solution outlet of the solution heat exchanger 7 is connected to the spray pipe at the top of the absorber 6 via a concentrated solution pump 9. The dilute solution outlet at the bottom of the absorber 6 is connected to the dilute solution inlet of the solution heat exchanger 7 via a dilute solution pump 8. This structure enables the circulation of the refrigerant solution.

[0070] Example 5

[0071] like Figure 5 As shown, this embodiment provides a medium-temperature waste heat heating heat pump, including: a waste heat water pipe 11, an evaporator 2, an absorber 6, a water-to-water heat exchanger 3, a generator 4, a condenser 5, and a solution heat exchanger 7. The inlet of the waste heat water pipe 11 is located on one side of the evaporator 2 or the water-to-water heat exchanger 3. After the waste heat water pipe 11 passes through the evaporator 2, the water-to-water heat exchanger 3, and the generator 4, its outlet is led out from one side of the generator 4. The waste heat water pipe 11 is filled with low-temperature waste water at 60-70°C generated by process cooling in the fields of petroleum, chemical industry, steel, non-ferrous metals, etc., which serves as the main heat source for the heating network water.

[0072] The absorber 6 is connected to the evaporator 2, and the heat network water pipe 12 passes through the water-to-water heat exchanger 3 and the absorber 6 in sequence, so that the heat network water flows out after absorbing the residual heat in the water-to-water heat exchanger 3 and the heat in the absorber 6, and is used for heating the heat network;

[0073] Generator 4 is in bidirectional communication with absorber 6 via solution heat exchanger 7. Condenser 5 is also connected to generator 4. Cooling water flows into condenser 5. The refrigerant water in condenser 5 is throttled and depressurized before flowing to evaporator 2. This embodiment's heat pump combines a traditional lithium bromide heating heat pump with a water-to-water heat exchanger 3. This allows it to utilize slightly cooler, medium-temperature wastewater (around 60°C to 70°C) and supply hot water to the heating network at a temperature approximately 20°C higher than the medium-temperature wastewater. This makes it suitable for use in cold northern regions during the winter months, where the ambient temperatures are relatively low.

[0074] In this embodiment, the inlet of waste heat water pipe 11 is located outside of water-to-water heat exchanger 3. Waste heat water pipe 11 sequentially passes through water-to-water heat exchanger 3, evaporator 2, and generator 4. The inlet of heating network water pipe 12 is located outside of water-to-water heat exchanger 3. It sequentially passes through water-to-water heat exchanger 3 and absorber 6, with the outlet of heating network water pipe 12 located outside of absorber 6. The waste heat water first enters water-to-water heat exchanger 3 to exchange heat with heating network water. It then enters evaporator 2 to heat the refrigerant, generating refrigerant vapor that enters absorber 6, initially raising the temperature of the heating network water. The waste heat water then enters generator 4, heating the lithium bromide solution within generator 4 before cooling and discharging. The refrigerant vapor within generator 4 enters condenser 5 for condensation. The condensed refrigerant solution is throttled and depressurized before flowing to evaporator 2, completing the refrigerant circulation process. The heating network water is initially heated by water-to-water heat exchanger 3, enters absorber 6, absorbs heat, and then flows out for heating in the heating network.

[0075] In this embodiment, the solution outlet at the bottom of the evaporator 2 is connected to the spray pipe at the top thereof via a circulation pump 10, and the concentrated solution outlet of the solution heat exchanger 7 is connected to the spray pipe at the top of the absorber 6 via a concentrated solution pump 9. The dilute solution outlet at the bottom of the absorber 6 is connected to the dilute solution inlet of the solution heat exchanger 7 via a dilute solution pump 8. This structure provides power for the circulation of the refrigerant solution.

[0076] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A medium-temperature waste heat heating heat pump, characterized in that: include: A waste heat pipe, an evaporator, an absorber, a water-to-water heat exchanger, a generator, a condenser, and a solution heat exchanger. The inlet of the waste heat pipe is located on one side of the evaporator or the water-to-water heat exchanger. After the waste heat pipe passes through the evaporator, the water-to-water heat exchanger, and the generator, its outlet is led out from one side of the generator. The absorber is connected to the evaporator, and the water pipe of the heating network passes through the water-to-water heat exchanger and the absorber in sequence, so that the water in the heating network absorbs heat and flows out to be used for heating the heating network; The generator is bidirectionally connected to the absorber through the solution heat exchanger, the condenser is connected to the generator, cooling water flows into the condenser, and the refrigerant water of the condenser flows to the evaporator through throttling and pressure reduction.

2. The medium temperature waste heat heating heat pump according to claim 1, characterized in that: The inlet of the waste heat water pipe is connected to a three-way regulating valve, and the three-way regulating valve is connected to the first branch pipe and the second branch pipe respectively passing through the evaporator and the water-to-water heat exchanger. The ends of the first branch pipe and the second branch pipe are merged and pass through the generator. The outlet of the waste heat water pipe is located on the external side of the generator.

3. The medium temperature waste heat heating heat pump according to claim 1, characterized in that: The inlet of the waste heat water pipe is located outside the evaporator, and the waste heat water pipe passes through the evaporator, the water-to-water heat exchanger and the generator in sequence.

4. The medium temperature waste heat heating heat pump according to claim 1, characterized in that: The inlet of the waste heat water pipe is located outside the water-to-water heat exchanger, and the waste heat water pipe passes through the water-to-water heat exchanger, the evaporator and the generator in sequence.

5. The medium temperature waste heat heating heat pump according to claim 2 or 3, characterized in that: The inlet of the heating network water pipe is located outside the water-to-water heat exchanger. The heating network water pipe passes through the water-to-water heat exchanger and the absorber in sequence. The outlet of the heating network water pipe is located outside the absorber.

6. The medium temperature waste heat heating heat pump according to claim 2 or 3, characterized in that: The hot network water pipe is provided with a first inlet and a second inlet, the first inlet is located outside the water-to-water heat exchanger, and the second inlet is located outside the absorber. Part of the hot network water enters the water-to-water heat exchanger through the first inlet to exchange heat with the waste hot water, and then mixes with another part of the hot network water that enters the absorber through the second inlet and is heated, and then flows out from the outlet of the hot network water pipe located outside the absorber.

7. The medium-temperature waste heat heating heat pump according to claim 1, characterized in that: The bottom solution outlet of the evaporator is connected to the spray pipe at the top thereof through a circulation pump.

8. The medium-temperature waste heat heating heat pump according to claim 1, characterized in that: The concentrated solution outlet of the solution heat exchanger is connected to the spray pipe at the top of the absorber through a concentrated solution pump.

9. The medium-temperature waste heat heating heat pump according to claim 1, characterized in that: The dilute solution outlet at the bottom of the absorber is connected to the dilute solution inlet of the solution heat exchanger through a dilute solution pump.

10. The medium-temperature waste heat heating heat pump according to claim 1, characterized in that: Cooling water is passed into the tube side of the condenser through a cooling water pipe.

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