Heating type absorption heat pump unit
By adopting a parallel drive heat source inlet pipeline and a solution binary circulation loop design in the heat-enhancing absorption heat pump unit, the problem of low efficiency in waste heat recovery of drive steam is solved, and efficient heat recovery and heating effect are achieved.
Patent Information
- Application Number
- CN202520296629.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-24
- Publication Date
- 2026-01-23
- Estimated Expiration
- 2035-02-24
AI Technical Summary
Traditional heat-enhancing absorption heat pump units have low waste heat recovery efficiency when using steam as a heat source, and the internal heat exchange area of the unit cannot be effectively matched, resulting in the inability to fully utilize the heat.
The design employs a parallel inlet pipeline for the three driving heat sources, allowing driving steam to simultaneously enter the three generators. Combined with a binary solution circulation loop and a heat exchanger, the heat exchange area is matched according to the heat load of each generator, and the steam flow rate is adjusted by a flow valve to achieve efficient waste heat recovery.
It improves the heat recovery efficiency of the driving steam, produces hot water at a higher temperature, reduces the heat exchange area by about 25%, and increases the heating capacity by 20%.
Smart Images
Figure CN223826520U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat pump technical field, concretely relates to a heat type absorption heat pump unit. BACKGROUND
[0002] The heat type absorption heat pump unit is a kind of heat pump, it utilizes high-temperature heat energy driving, and the heat energy of low-temperature heat source is promoted to medium temperature, to improve the utilization efficiency of heat energy.
[0003] The traditional heat type absorption heat pump unit of binary solution circulation includes three generators and two absorbers, and the external driving heat source is high-temperature hot water, and the high-temperature hot water flows through three generators in turn and is gradually cooled down.The driving heat source of current heat type absorption heat pump unit is limited to high-temperature hot water, when external heat source is driving steam, the generator in the heat type absorption heat pump unit can only utilize a small amount of sensible heat, and the internal heat exchange area of unit cannot be effectively matched, and the recovery heat quantity efficiency is relatively low.
[0004] Therefore, how to provide a kind of heat type absorption heat pump unit, when the driving heat source is driving steam, recovery efficiency is relatively high, it is the problem that the person skilled in the art has been concerned. CONTENT OF UTILITY MODEL
[0005] The purpose of the embodiment of the application is to provide a kind of heat type absorption heat pump unit, the heat recovery efficiency of driving steam is relatively high.
[0006] The embodiment of the application provides a kind of heat type absorption heat pump unit, comprising:
[0007] First generator, second generator and third generator, the driving heat source import pipe of first generator, second generator and third generator is connected in parallel;
[0008] First absorber, the first absorber, the first generator and the second generator form first solution circulation loop;
[0009] Second absorber, the second absorber and the third generator form second solution circulation loop.
[0010] In the embodiments of the present application, the first generator, the second generator and the third generator are respectively communicated with the driving heat source main pipe through separate pipelines. In this way, the high-temperature heat source in the driving heat source main pipe can enter the interiors of the three generators at the same time, the latent heat of the driving steam can be utilized in a single stage, the driving steam becomes condensed water after heat release in the interiors of the first generator, the second generator and the third generator, and the driving steam flow entering the interiors of the three generators can be adjusted according to the actual working conditions on site to adjust the heat load of the generators on site. Under the premise of the same solution binary cycle, more waste heat can be recovered, and hot water with higher heat can be produced.
[0011] In an example, the first absorber, the first generator and the second generator are connected in series to form the first solution circulation loop.
[0012] In an example, the inner cavity of the second generator is communicated with the inner cavity of the second absorber, so that the refrigerant steam generated in the interior of the second generator can enter the interior of the second absorber;
[0013] Further comprising an evaporator for providing refrigerant steam to the first absorber.
[0014] In an example, further comprising a first condenser and a second condenser, the first condenser is used for condensing the refrigerant steam generated by the first generator; the second condenser is used for condensing the refrigerant steam generated by the third generator;
[0015] The refrigerant outlets of the first condenser and the second condenser are communicated with the inner cavity of the evaporator.
[0016] In an example, the first absorber, the second absorber, the first condenser and the second condenser all have heat exchange pipe assemblies in their interiors, the heat exchange pipe assemblies are used for passing through the working medium to be heated, and the heat exchange pipe assemblies in the interiors of the first absorber, the second absorber, the first condenser and the second condenser are connected in series, in parallel or in series-parallel.
[0017] In an example, the solution pipelines of the first generator, the second generator and the first absorber are connected in series to form the first solution circulation loop,
[0018] Further comprising a first solution heat exchanger and a second solution heat exchanger, the first solution heat exchanger is used for heat exchange between the solution flowing out of the first absorber and the solution flowing out of the second generator; the solution flowing out of the first absorber flows into the second solution heat exchanger after heat exchange in the first solution heat exchanger, and exchanges heat with the solution flowing out of the first generator.
[0019] In an example, a third solution heat exchanger is further included for heat exchange between the solution flowing out of the third generator and the solution flowing into the third generator.
[0020] In an example, at least one solution pump is provided on the first solution circulation loop for providing power for solution flow.
[0021] Alternatively or additionally, at least one solution pump is provided on the second solution circulation loop for providing power for solution flow.
[0022] In an example, the driving heat source inlet pipe of at least one of the first generator, the second generator and the third generator includes a first branch and a second branch connected in parallel, and a flow valve is provided on the second branch, and the opening degree of the flow valve is adjustable.
[0023] In an example, the driving heat source inlet pipe is connected to a driving steam main pipe away from the pipe orifice of each generator. BRIEF DESCRIPTION OF DRAWINGS
[0024] Figure 1 FIG. 1 is a structural schematic diagram of a heating type absorption heat pump unit according to an example of the present application;
[0025] Figure 2 FIG. 2 is a schematic diagram of another connection mode of the first generator, the second generator and the third generator of the heating type absorption heat pump unit according to an example of the present application and a driving steam pipe.
[0026] In the drawings, Figure 1 and Figure 2 the reference signs in the drawings are explained as follows:
[0027] 1 evaporator;
[0028] 21 first generator; 21A first driving heat source inlet pipe; 22 second generator; 22A second driving heat source inlet pipe; 23 third generator; 23A third driving heat source inlet pipe;
[0029] 31 first absorber; 32 second absorber;
[0030] 41 first condenser; 42 second condenser;
[0031] 5 first solution heat exchanger; 6 second solution heat exchanger; 7 third solution heat exchanger;
[0032] 8 solution pump; 9 refrigerant pump. DETAILED DESCRIPTION
[0033] In view of the technical problem of low waste heat recovery efficiency of driving steam in the current heat-increasing absorption heat pump unit, the utility model person has carried out a large number of researches and experiments, and finds that the heat of driving steam mainly exists in latent heat of phase change, when driving steam flows through multiple generators in turn, most of the heat of driving steam will be absorbed in the first generator, and only a small amount of sensible heat can be used in the following generators, which leads to that the internal heat exchange area of the unit cannot be effectively matched, and then the driving steam is difficult to be applied to the heat-increasing absorption heat pump unit.
[0034] On the basis of the above research, the utility model person further explores, improves the structure of the current heat-increasing absorption heat pump unit, so that the improved heat-increasing absorption heat pump unit can use driving steam as a driving heat source, and the heat recovery efficiency of the heat-increasing absorption heat pump unit for driving steam is also relatively high.
[0035] In order for those skilled in the art to better understand the technical solutions of the embodiments of the present application, the embodiments of the present application are further described in detail below with reference to the drawings and specific embodiments.
[0036] Please refer to Figure 1 and Figure 2 , Figure 1 The structure of the heat-increasing absorption heat pump unit in an embodiment provided by the embodiments of the present application is shown in the structure diagram. Figure 2 The schematic diagram of another connection mode of the first generator, the second generator and the third generator of the heat-increasing absorption heat pump unit in the embodiments of the present application and the driving steam pipe is shown.
[0037] The embodiments of the present application provide a heat-increasing absorption heat pump unit, also known as a type of heat pump, which is usually powered by a high-temperature heat source, uses lithium bromide solution as an absorbent, and uses water as a coolant, uses a small amount of high-temperature heat source (such as steam, high-temperature hot water, combustible gas combustion heat, etc.) as a driving heat source, and generates a large amount of medium-temperature useful heat energy.
[0038] It should be noted that the "solution" in this paper refers to the absorbent solution, which can be lithium bromide solution; the "coolant" in this paper refers to a medium substance used to complete energy conversion, which can be water, etc., which can be evaporated into water vapor (i.e. coolant steam) in the evaporator 1 or the generator, and can be absorbed by the absorbent solution in the absorber to reduce the concentration of the absorbent solution, and can be separated from the absorbent solution in the generator to increase the concentration of the absorbent solution.
[0039] The embodiments of the present application provide a heat-increasing absorption heat pump unit, which comprises a first generator 21, a second generator 22, a third generator 23, a first absorber 31, a second absorber 32, an evaporator 1, a first condenser 41 and a second condenser 42.
[0040] In the embodiment of the present application, the first absorber 31, the first generator 21 and the second generator 22 form a first solution circulation loop; the second absorber 32 and the third generator 23 form a second solution circulation loop. That is, the heat-reinforced absorption heat pump unit has a solution binary cycle, including two independent solution loops: the first solution circulation loop and the second solution circulation loop. The solution in the first solution circulation loop circulates and flows among the first generator 21, the second generator 22 and the first absorber 31, and the solution in the second solution circulation loop circulates and flows between the second absorber 32 and the third generator 23. The specific connection mode of the first solution circulation loop will be described in detail below.
[0041] In the embodiment of the present application, the inner cavity of the second generator 22 can communicate with the inner cavity of the second absorber 32, so that the refrigerant vapor generated in the second generator 22 can enter the inside of the second absorber 32; in this way, the second absorber 32 does not need to be separately configured with an evaporation device, and the system structure is relatively simple.
[0042] In the embodiment of the present application, the evaporator 1 is used to provide the first absorber 31 with refrigerant vapor, and the evaporator 1 has a waste heat pipeline. External waste heat entering the waste heat pipeline can heat the refrigerant entering the evaporator 1, thereby generating refrigerant vapor, which can be absorbed by the absorbent when entering the first absorber 31.
[0043] In the embodiment of the present application, the first generator 21, the second generator 22 and the third generator 23 all have a driving heat source inlet, and the driving heat source inlet is connected to the driving heat source main pipe through a driving heat source inlet pipe. In order to describe the technical solution simply, the driving heat source inlet pipe connected between the driving heat source inlet of the first generator 21 and the driving heat source main pipe is defined as the first driving heat source inlet pipe 21A, the driving heat source inlet pipe connected between the driving heat source inlet of the second generator 22 and the driving heat source main pipe is defined as the second driving heat source inlet pipe 22A, and the driving heat source inlet pipe connected between the driving heat source inlet of the third generator 23 and the driving heat source main pipe is defined as the third driving heat source inlet pipe 23A.
[0044] In the embodiment of the present application, the first driving heat source inlet pipe, the second driving heat source inlet pipe and the third driving heat source inlet pipe are arranged in parallel, that is, the first generator 21, the second generator 22 and the third generator 23 are respectively communicated with the driving heat source main pipe through separate pipelines. In this way, the high-temperature heat source in the driving heat source main pipe can enter the interiors of the three generators at the same time, the latent heat of the driving steam can be utilized in a single stage, the driving steam becomes condensed water after heat release in the interiors of the first generator 21, the second generator 22 and the third generator 23, and then is discharged. In this way, the heat exchange areas of the three generators can be matched during design and manufacture according to the respective heat loads of the three generators, the driving steam flow entering the interiors of the three generators can be adjusted according to the actual working conditions on site, the heat load of the generator can be adjusted on site, and more waste heat can be recovered and more high-heat hot water can be produced under the premise of the same solution binary cycle.
[0045] The condensed water of the driving steam after flowing through the first generator 21, the second generator 22 and the third generator 23 can be selected to be combined or branched, and the heat thereof can be further utilized in combination with other equipment.
[0046] In the embodiment of the present application, the first absorber 31, the first generator 21 and the second generator 22 are arranged in series to form a first solution circulation loop. Figure 1 A specific embodiment in which the first absorber 31, the first generator 21 and the second generator 22 are arranged in series is shown. The dilute solution flowing out of the first absorber 31 is transported to the first generator 21, in the interior of which the dilute solution is heated by the driving steam to generate cold agent steam, and then the concentration and temperature of the dilute solution are increased. The intermediate-concentration solution flowing out of the first generator 21 is transported to the second generator 22 after heat exchange and temperature reduction through the second solution heat exchanger. In the interior of the second generator 22, the solution is continuously heated by the driving steam flowing into the second generator 22 to generate a concentrated solution. The concentrated solution flowing out of the second generator 22 is transported to the first absorber 31 after heat exchange with the dilute solution through the first solution heat exchanger. The concentration of the concentrated solution is diluted after absorbing the cold agent steam from the evaporator 1 in the interior of the first absorber 31, and the released heat is taken away by the to-be-heated working medium.
[0047] In the second solution circulation loop, the dilute solution of the second absorber 32 is transported to the third generator 23 after heat exchange through the third solution heat exchanger. In the interior of the third generator 23, the dilute solution is heated by the driving steam to generate cold agent steam. The concentrated solution flowing out of the third generator 23 is transported to the second absorber 32 after heat exchange through the third solution heat exchanger. In the interior of the second absorber 32, the concentrated solution is diluted after absorbing the cold agent steam generated by the second generator 22, and the released heat is taken away by the working medium from the first absorber 31.
[0048] The refrigerant steam generated by the first generator 21 is condensed inside the first condenser 41, and the refrigerant steam generated by the third generator 23 is condensed inside the second condenser 42. The condensate outlets of the first condenser 41 and the second condenser 42 are communicated with the inner cavity of the evaporator 1, and the condensed refrigerant of the first condenser 41 and the second condenser 42 is introduced into the evaporator 1, and the heat generated in the condensation process is taken away by the working medium.
[0049] The refrigerant is evaporated in the evaporator 1, and the evaporated refrigerant steam is absorbed by the concentrated solution in the first absorber 31, and the unevaporated refrigerant is sent to the top of the evaporator 1 under the pumping action of the refrigerant pump 9 to continue to be sprayed or dripped.
[0050] The heat exchange pipe group in the evaporator 1 can be connected with an external waste heat source. The waste heat source enters the evaporator 1, releases heat, and then flows out of the evaporator 1. Since the driving heat source gives heat to several groups of heat release to the maximum extent, the unit recovers more heat of the waste heat source.
[0051] In the embodiment of the present application, the first absorber 31, the second absorber 32, the first condenser 41 and the second condenser 42 all have heat exchange pipe assemblies inside, the heat exchange pipe assemblies are used to introduce the working medium to be heated, and the heat exchange pipe assemblies inside the first absorber 31, the second absorber 32, the first condenser 41 and the second condenser 42 are connected in series, in parallel or in series-parallel. Figure 1 The specific embodiment in which the heat exchange pipe assemblies inside the first absorber 31, the second absorber 32, the first condenser 41 and the second condenser 42 are connected in series is shown. That is, after the working medium to be heated is cooled at the user end, it is introduced into the first absorber 31, the second absorber 32, the first condenser 41 and the second condenser 42 for heat exchange, and then flows back to the user end for heating. The hot water releases heat and then returns to the unit.
[0052] The top of the evaporator 1, the first generator 21, the second generator 22, the third generator 23, the first absorber 31 and the second absorber 32 in the embodiment of the present application is provided with a spraying assembly. The solution is sprayed into the inside of the first generator 21, the second generator 22, the third generator 23, the first absorber 31 and the second absorber 32 from the corresponding spraying assembly, and the refrigerant is sprayed into the inside of the evaporator 1 from the spraying assembly at the top of the evaporator 1. In this way, the heat exchange and absorption efficiency of the unit can be increased.
[0053] The above processes are continuously cycled, that is, the heat of the high-temperature heat source can be continuously recovered, and the working medium with the required temperature of the user can be prepared. The working medium to be heated can be hot water.
[0054] The embodiment of the utility model takes the driving steam as the driving heat source as an example to specifically describe the technical scheme and technical effect, and the person skilled in the art should understand that the heat source of the unit provided by the utility model can not be limited to the driving steam, and can also be one or a combination of several of high-temperature hot water, fuel oil and fuel gas, for example, the combination of steam and hot water, that is, three generators are respectively connected to different types of driving heat sources, and of course, it can also be a combination of other heat sources. Similarly, the waste heat source in the utility model can be low-grade heat sources such as hot water, exhaust steam or low-temperature heat source water.
[0055] In the embodiment of the application, the heat-increasing absorption heat pump unit further comprises a first solution heat exchanger 5, a second solution heat exchanger 6 and a third solution heat exchanger 7. The first solution heat exchanger 5 is used for heat exchange between the solution flowing out of the first absorber 31 and the solution flowing out of the second generator 22; after the heat exchange in the first solution heat exchanger, the solution flowing out of the first absorber 31 flows into the second solution heat exchanger 6 and exchanges heat with the solution flowing out of the first generator 21.
[0056] The third solution heat exchanger 7 is used for heat exchange between the solution flowing out of the third generator 23 and the solution flowing into the third generator 23.
[0057] The heat exchangers arranged in the first solution circulation loop and the second solution circulation loop can further improve the utilization efficiency of the unit for waste heat.
[0058] In order to ensure the smooth flow of the solution in the unit, the first solution circulation loop and the second solution circulation loop can further be provided with a solution pump 8 for providing the flow power of the solution in the loop. The number of solution pumps 8 in each loop can be one or two or more than three, which is mainly selected according to the arrangement position of each component in the unit. Figure 1 In the specific embodiment shown in FIG. 3, three solution pumps 8 are arranged in the first solution circulation loop, and two solution pumps 8 are arranged in the second solution circulation loop. In the specific embodiment, the solution pump 8 is arranged at the solution outlet position of the absorber, and the solution pump 8 is arranged at the outlet position of the generator.
[0059] Similarly, in order to ensure the smooth circulation of the refrigerant in the evaporator 1, a refrigerant pump 9 can be further arranged.
[0060] In order to meet the needs of different working conditions of the unit, the application makes the following arrangements for the driving heat source inlet pipe.
[0061] In the embodiment of the application, the drive heat source inlet pipe of at least one of the first generator 21, the second generator 22 and the third generator 23 comprises a first branch 201 and a second branch 202 connected in parallel, the second branch 202 is provided with a flow valve 11, and the opening degree of the flow valve 11 is adjustable. The first branch 201 is connected between a total pipe connected to the drive heat source and the drive heat source inlet of the corresponding generator, and no valve is arranged on the first branch 201. The drive heat source inlet pipe is connected to the drive steam total pipe through the pipe opening away from the generator.
[0062] By adjusting the opening degree of the flow valve 11 on the second branch 202, the system flow can be efficiently and flexibly adjusted, and the uneven heat distribution of the unit caused by the adverse factors such as misoperation or steam fluctuation is avoided, so that the system stability and safety are improved.
[0063] The pipe diameters of the first branch 201 and the second branch 202 can be the same, and of course can be different.
[0064] According to the application, under the drive of the heat source steam, the waste heat is 37-25 DEG C, the hot water is 42-89 DEG C, the heat exchange area can be reduced by about 25%, and 20% of heating capacity is obtained.
[0065] In the description of the embodiment of the application, the term "comprises", "includes" or any other variant thereof is intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device.
[0066] The above is only the preferred embodiment of the application, and it should be pointed out that for ordinary skilled in the art, without departing from the principles of the application, a number of improvements and refinements can be made, and these improvements and refinements should be regarded as the protection scope of the application.
Claims
1. A heat-enhancing absorption heat pump unit, characterized in that, include: The first generator (21), the second generator (22), and the third generator (23) are connected in parallel with the drive heat source inlet pipes of the first generator (21), the second generator (22), and the third generator (23); The first absorber (31), the first generator (21) and the second generator (22) form a first solution circulation loop; The second absorber (32) and the third generator (23) form a second solution circulation loop.
2. The heat-enhancing absorption heat pump unit according to claim 1, characterized in that, The first absorber (31), the first generator (21) and the second generator (22) are connected in series to form the first solution circulation loop.
3. The heat-enhancing absorption heat pump unit according to claim 1, characterized in that, The inner cavity of the second generator (22) is connected to the inner cavity of the second absorber (32) so that the refrigerant vapor generated inside the second generator (22) can enter the interior of the second absorber (32); It also includes an evaporator (1) for supplying refrigerant vapor to the first absorber (31).
4. The heat-enhancing absorption heat pump unit according to claim 3, characterized in that, It also includes a first condenser (41) and a second condenser (42), the first condenser (41) being used to condense the refrigerant vapor generated by the first generator (21); the second condenser (42) being used to condense the refrigerant vapor generated by the third generator (23); The refrigerant outlets of the first condenser (41) and the second condenser (42) are connected to the inner cavity of the evaporator (1).
5. The heat-enhancing absorption heat pump unit according to claim 4, characterized in that, The first absorber (31), the second absorber (32), the first condenser (41) and the second condenser (42) each have a heat exchange tube assembly inside. The heat exchange tube assembly is used to introduce the working fluid to be heated. The heat exchange tube assemblies inside the first absorber (31), the second absorber (32), the first condenser (41) and the second condenser (42) are connected in series, in parallel or in series-parallel connection.
6. The heat-enhancing absorption heat pump unit according to claim 1, characterized in that, The solution pipelines of the first generator (21), the second generator (22), and the first absorber (31) are connected in series to form the first solution circulation loop. It also includes a first solution heat exchanger (5) and a second solution heat exchanger (6). The first solution heat exchanger (5) is used for heat exchange between the solution flowing out of the first absorber (31) and the solution flowing out of the second generator (22). The solution flowing out of the first absorber (31) flows into the second solution heat exchanger after heat exchange in the first solution heat exchanger, and exchanges heat with the solution flowing out of the first generator (21).
7. The heat-enhancing absorption heat pump unit according to claim 1, characterized in that, It also includes a third solution heat exchanger (7) for heat exchange between the solution flowing out of the third generator (23) and the solution flowing into the third generator (23).
8. The heat-enhancing absorption heat pump unit according to claim 1, characterized in that, At least one solution pump is provided in the first solution circulation loop to provide power for the solution flow; Alternatively / and, at least one solution pump is provided on the second solution circulation loop to provide the power for solution flow.
9. The heat-enhancing absorption heat pump unit according to any one of claims 1 to 8, characterized in that, The driving heat source inlet pipe of at least one of the first generator (21), the second generator (22) and the third generator (23) includes a first branch and a second branch connected in parallel. A flow valve is provided on the second branch, and the opening degree of the flow valve is adjustable.
10. The heat-enhancing absorption heat pump unit according to any one of claims 1 to 8, characterized in that, The inlet pipe of the driving heat source is connected to the main driving steam pipe away from the pipe openings of each generator.