Phase-change mixed heat-carrying direct-drive heat pump

Abstract

The utility model discloses a phase-change mixed heat-carrying direct-drive heat pump, which belongs to the technical field of energy conservation and environmental protection, and comprises a first flash evaporation unit, a second flash evaporation unit, a first condensation heat exchange unit, a second condensation heat exchange unit, a third flash evaporation unit and a fourth condensation heat exchange unit, an ejector is arranged between the second flash evaporation unit and the second condensation heat exchange unit, and a medium to be heated sequentially passes through the first condensation heat exchange unit and the second condensation heat exchange unit. The ejector is arranged between the second flash evaporation unit and the second condensation heat exchange unit and is coupled with a traditional direct heating machine, namely a flash evaporation and condensation combination, so that the temperature of water or a medium to be heated can be stably increased, the temperature of the water or the medium to be heated can be 15-30 DEG C higher than that of a flash evaporation medium, and the coefficient of performance (COP) can reach at least 2.0.

Description

Technical Field

[0001] This utility model belongs to the field of energy-saving and environmental protection technology, especially the phase change hybrid heat transfer direct drive heat pump. Background Technology

[0002] Industrial wastewater is diverse, with significant variations in composition between different industries and even within the same industry's various production processes. This wastewater may contain inorganic pollutants (such as heavy metal ions, acids, and alkalis) or organic pollutants (such as organic matter and aromatic compounds), and may also contain multiple different types of pollutants simultaneously. It is characterized by high corrosiveness, easy clogging, and abrasion. Currently, vacuum phase change heat exchange is generally used to extract this type of industrial wastewater. However, because vacuum phase change heat exchange lowers the boiling point temperature during waste heat extraction, the resulting water temperature is also relatively low, leading to a waste of heat source quality. Utility Model Content

[0003] Purpose of the utility model: To provide a phase change hybrid heat pump with direct drive to solve the above-mentioned problems in the prior art.

[0004] Technical solution: A phase change hybrid heat transfer direct drive heat pump, comprising: a first flash unit, wherein the medium and exhaust steam after flashing in the first flash unit enter a second flash unit and a first condensing heat exchange unit respectively, and an ejector is provided between the second flash unit and the second condensing heat exchange unit, wherein the medium to be heated passes through the first condensing heat exchange unit and the second condensing heat exchange unit in sequence.

[0005] Furthermore, the ejector is provided with a steam exhaust inlet connected to the second flash evaporation unit, a drive steam inlet, and a mixed steam outlet connected to the second condensation heat exchange unit.

[0006] Furthermore, multiple of the aforementioned injectors are arranged in parallel.

[0007] Furthermore, the first condensation heat exchange unit is connected to a vacuum pump.

[0008] Furthermore, a demister is provided inside the first flash evaporation unit.

[0009] Furthermore, the first flash evaporation unit and the first condensation heat exchange unit are either an integrated structure or separate structures.

[0010] Furthermore, the first flash evaporation unit and the first condensation heat exchange unit are connected through a steam exhaust channel or through a steam exhaust pipeline.

[0011] Furthermore, it also includes at least one set of direct-drive flash evaporation unit and direct-drive condensation heat exchange unit. The medium and steam exhaust after flash evaporation in the direct-drive flash evaporation unit enter the first flash evaporation unit and the direct-drive condensation heat exchange unit, respectively. The medium to be heated passes through the direct-drive condensation heat exchange unit and the first condensation heat exchange unit in sequence.

[0012] Furthermore, it also includes at least one set of mixing flash evaporation unit and mixing condensation heat exchange unit, with a mixing injector provided between the mixing flash evaporation unit and the mixing condensation heat exchange unit, and the medium to be heated passing through the first condensation heat exchange unit, the second condensation heat exchange unit and the mixing condensation heat exchange unit in sequence.

[0013] Furthermore, it also includes at least one set of mixing flash evaporation unit and mixing condensation heat exchange unit, with a mixing ejector provided between the mixing flash evaporation unit and the mixing condensation heat exchange unit, and the medium to be heated passing through the direct-drive condensation heat exchange unit, the first condensation heat exchange unit, the second condensation heat exchange unit and the mixing condensation heat exchange unit in sequence.

[0014] Beneficial effects:

[0015] This application provides an ejector between the second flash unit and the second condensation heat exchange unit, which is coupled with a conventional direct heat exchanger, i.e., a flash-condensation combination, to stably increase the temperature of the water or medium to be heated. This can achieve a temperature 15°C to 30°C higher than the flash medium temperature, thereby achieving a coefficient of performance (COP) of at least 2.0. Attached Figure Description

[0016] Figure 1 This is a structural schematic diagram of Embodiment 1 of the present invention;

[0017] Figure 2 This is a schematic diagram of the structure of Embodiment 2 of this utility model;

[0018] Figure 3 This is a structural schematic diagram of Embodiment 3 of this utility model;

[0019] Figure 4 This is a structural schematic diagram of Embodiment 4 of this utility model.

[0020] The attached figures are labeled as follows: First flash evaporation unit 100A, First condensation heat exchange unit 100B, Second flash evaporation unit 200A, Second condensation heat exchange unit 200B, Ejector 300A, Steam exhaust inlet 310A, Driven steam inlet 320A, Mixed steam outlet 330A, Direct drive flash evaporation unit 400A, Direct drive condensation heat exchange unit 400B, Mixed flash evaporation unit 500A, Mixed condensation heat exchange unit 500B. Detailed Implementation

[0021] In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. However, it will be apparent to those skilled in the art that the present invention can be practiced without one or more of these details. In other instances, certain technical features well-known in the art have not been described in order to avoid confusion with the present invention.

[0022] Example 1: As Figure 1 A phase change hybrid heat transfer direct-drive heat pump includes: a first flash unit 100A, wherein the medium and exhaust steam after flashing in the first flash unit 100A enter a second flash unit 200A and a first condensing heat exchange unit 100B, respectively; an ejector 300A is provided between the second flash unit 200A and the second condensing heat exchange unit 200B; the medium to be heated passes sequentially through the first condensing heat exchange unit 100B and the second condensing heat exchange unit 200B. The ejector 300A is provided with an exhaust steam inlet 310A communicating with the second flash unit 200A, a driving steam inlet 320A, and a mixed steam outlet 330A communicating with the second condensing heat exchange unit 200B. A waste liquid return pump is provided on the second flash unit 200A. A vacuum pump is connected to the first condensing heat exchange unit 100B. Demisters are provided in both the first flash unit 100A and the second flash unit 200A. The first flash evaporation unit 100A and the first condensation heat exchange unit 100B are either an integrated structure or separate structures. The first flash evaporation unit 100A and the first condensation heat exchange unit 100B are connected through a steam exhaust channel or through a steam exhaust pipeline.

[0023] This application provides an ejector between the second flash unit 200A and the second condensation heat exchange unit 200B, and couples it with a conventional direct heat exchanger, i.e., a flash-condensation combination, to stably increase the temperature of the water or medium to be heated. This can achieve a temperature 15°C to 30°C higher than the flash medium temperature, thereby achieving a COP of at least 2.0.

[0024] The medium first enters the first flash evaporation unit 100A, where it undergoes flash evaporation under a negative pressure environment maintained by a vacuum pump and the first condensation heat exchange unit 100B, generating first-stage flash steam. The waste liquid, cooled by flash evaporation in the first flash evaporation unit 100A, enters the second flash evaporation unit 200A and undergoes flash evaporation again under a negative pressure environment maintained by an ejector 300A. The waste liquid, cooled by double-effect flash evaporation, finally exits the phase change mixing direct-drive heat pump.

[0025] The flash steam from the first flash unit 100A, after being demisted, enters the first condensing heat exchange unit 100B, where it heats the water to be heated, condenses, and discharges the condensate. The flash steam from the second flash unit 200A, after being demisted, enters the exhaust steam inlet 310A of the ejector 300A, where it mixes with the driving steam entering from the driving steam inlet 320A at the other end. After mixing and heating, the mixture steam exits through the mixed steam outlet 330A into the second condensing heat exchange unit 200B, heating the water to be heated by the upper-effect condenser, thus improving its thermal quality.

[0026] This application includes, but is not limited to, a vacuum pump that can be connected to the condensation unit or directly to the flash evaporation unit, depending on the actual situation. There is no limitation on the specific connection method, as long as the flash evaporation unit is subjected to vacuum negative pressure treatment.

[0027] The water to be heated first passes through the low-temperature flash steam of the first condensing heat exchange unit 100B for heating. After heating, it enters the second condensing heat exchange unit 200B for thermal quality improvement. After absorbing heat and raising the temperature, it is discharged from the phase change mixing direct drive heat pump.

[0028] The condensate generated by the second condensation heat exchange unit 200B and the first condensation heat exchange unit 100B in this embodiment can be stored or used in the next process stage. The specific application scenarios will not be elaborated in this embodiment.

[0029] Example 2: Figure 2 As shown, a phase change hybrid heat transfer direct-drive heat pump includes: a first flash unit 100A, where the medium and exhaust steam after flashing in the first flash unit 100A enter a second flash unit 200A and a first condensing heat exchange unit 100B, respectively; an ejector 300A is provided between the second flash unit 200A and the second condensing heat exchange unit 200B; the medium to be heated passes sequentially through the first condensing heat exchange unit 100B and the second condensing heat exchange unit 200B; and at least one set of direct-drive flash units 400A and direct-drive condensing heat exchange units 400B, where the medium and exhaust steam after flashing in the direct-drive flash unit 400A enter the first flash unit 100A and the direct-drive condensing heat exchange unit 400B, respectively; and the medium to be heated passes sequentially through the direct-drive condensing heat exchange unit 400B and the first condensing heat exchange unit 100B. A waste liquid return pump is provided on the second flash unit 200A. The first condensing heat exchange unit 100B and the direct-drive condensing heat exchange unit 400B are connected to a vacuum pump. A demister is installed in each of the first flash evaporation unit 100A, the second flash evaporation unit 200A, and the direct-drive flash evaporation unit 400A. The first flash evaporation unit 100A and the first condensing heat exchange unit 100B are either an integrated structure or separate structures. The first flash evaporation unit 100A and the first condensing heat exchange unit 100B are connected via a steam exhaust channel or a steam exhaust pipeline.

[0030] The medium in this application first undergoes flash evaporation in the direct-drive flash unit 400A. The flashed steam then enters the direct-drive condensing heat exchange unit 400B for condensation. The flashed medium then enters the first flash unit 100A, where it undergoes flash evaporation under the negative pressure environment maintained by the vacuum pump and the first condensing heat exchange unit 100B, generating first-stage flash steam. The waste liquid after flash evaporation and cooling in the first flash unit 100A enters the second flash unit 200A and undergoes flash evaporation under the negative pressure environment maintained by the ejector 300A. The waste liquid after multi-effect flash evaporation and cooling finally exits the phase change mixing direct-drive heat pump.

[0031] The flash steam from the first flash unit 100A, after being demisted, enters the first condensing heat exchange unit 100B, where it heats the water to be heated, condenses, and discharges the condensate. The flash steam from the second flash unit 200A, after being demisted, enters the exhaust steam inlet 310A of the ejector 300A, where it mixes with the driving steam entering from the driving steam inlet 320A at the other end. After mixing and heating, the mixture steam exits through the mixed steam outlet 330A into the second condensing heat exchange unit 200B, heating the water to be heated by the upper-effect condenser, thus improving its thermal quality.

[0032] The water to be heated first passes through the direct-drive condensing heat exchange unit 400B and the first condensing heat exchange unit 100B and is heated by low-temperature flash steam. After heating, it enters the second condensing heat exchange unit 200B for thermal quality improvement. After absorbing heat and raising the temperature, it is discharged from the phase change mixing direct-drive heat pump.

[0033] The condensate generated by the direct-drive condensing heat exchange unit 400B, the second condensing heat exchange unit 200B and the first condensing heat exchange unit 100B in this embodiment can be stored or used in the next process stage. The specific application scenarios will not be elaborated in this embodiment.

[0034] Example 3: Figure 3As shown, a phase change hybrid heat transfer direct-drive heat pump includes: a first flash unit 100A, where the medium and exhaust steam after flashing in the first flash unit 100A enter a second flash unit 200A and a first condensing heat exchange unit 100B, respectively. An ejector 300A is provided between the second flash unit 200A and the second condensing heat exchange unit 200B. The medium to be heated passes sequentially through the first condensing heat exchange unit 100B and the second condensing heat exchange unit 200B. The pump also includes at least one set of mixing flash units 500A and mixing condensing heat exchange units 500B, with a mixing ejector 300B provided between them. The medium to be heated passes sequentially through the first condensing heat exchange unit 100B, the second condensing heat exchange unit 200B, and the mixing condensing heat exchange unit 500B. A waste liquid return pump is provided on the mixing flash unit 500A. A vacuum pump is connected to the first condensing heat exchange unit 100B. Each of the first flash evaporation unit 100A, the second flash evaporation unit 200A, and the mixing flash evaporation unit 500A is equipped with a demister. The first flash evaporation unit 100A and the first condensation heat exchange unit 100B are either an integrated structure or separate structures. The first flash evaporation unit 100A and the first condensation heat exchange unit 100B are connected via a steam exhaust channel or a steam exhaust pipeline.

[0035] The medium first enters the first flash unit 100A, where it undergoes flash evaporation under the negative pressure environment maintained by the vacuum pump and the first condensation heat exchange unit 100B, generating first-stage flash steam. After being flash-cooled by the first flash unit 100A, the medium enters the second flash unit 200A and undergoes flash evaporation under the negative pressure environment maintained by the ejector 300A. After being flash-cooled by the second flash unit 200A, the medium enters the mixing flash unit 500A and undergoes flash evaporation again. Under the negative pressure environment maintained by the mixing ejector 300B, the waste liquid, after being cooled by multi-effect flash evaporation, finally exits the phase change mixing direct-drive heat pump.

[0036] The flash steam from the first flash unit 100A, after being demisted, enters the first condensing heat exchange unit 100B, where it heats the water to be heated, condenses, and discharges the condensate. The flash steam from the second flash unit 200A, after being demisted, enters the exhaust steam inlet 310A of the ejector 300A, where it mixes with the driving steam entering from the driving steam inlet 320A. After mixing and heating, the mixture steam exits through the mixed steam outlet 330A into the second condensing heat exchange unit 200B. Similarly, the steam generated by the mixing flash unit 500A enters the mixing ejector 300B and finally enters the mixing condensing heat exchange unit 500B, heating the water to be heated by the high-efficiency condenser, thus further improving the thermal quality.

[0037] The water to be heated first passes through the low-temperature flash steam of the first condensing heat exchange unit 100B for heating. After heating, it enters the second condensing heat exchange unit 200B for thermal quality improvement, and then enters the mixing condensing heat exchange unit 500B for further quality improvement. After absorbing heat and raising the temperature, it is discharged from the phase change mixing direct drive heat pump.

[0038] The condensate generated by the hybrid condensation heat exchange unit 500B, the second condensation heat exchange unit 200B and the first condensation heat exchange unit 100B in this embodiment can be stored or used in the next process stage. The specific application scenarios will not be elaborated in this embodiment.

[0039] Example 4: Figure 4 As shown, a phase change hybrid heat transfer direct-drive heat pump includes: a first flash unit 100A, where the medium and exhaust steam after flashing in the first flash unit 100A enter a second flash unit 200A and a first condensing heat exchange unit 100B respectively; an ejector 300A is provided between the second flash unit 200A and the second condensing heat exchange unit 200B; the medium to be heated passes sequentially through the first condensing heat exchange unit 100B and the second condensing heat exchange unit 200B; and at least one set of direct-drive flash units 400A and direct-drive condensing heat exchange units 400B. The medium after flashing in the direct-drive flash unit 400A... The steam and exhaust steam enter the first flash evaporation unit 100A and the direct-drive condensation heat exchange unit 400B respectively. The medium to be heated passes sequentially through the direct-drive condensation heat exchange unit 400B and the first condensation heat exchange unit 100B. The system also includes at least one set of mixing flash evaporation unit 500A and mixing condensation heat exchange unit 500B. A mixing injector 300B is provided between the mixing flash evaporation unit 500A and the mixing condensation heat exchange unit 500B. The medium to be heated passes sequentially through the direct-drive condensation heat exchange unit 400B, the first condensation heat exchange unit 100B, the second condensation heat exchange unit 200B, and the mixing condensation heat exchange unit 500B. A waste liquid return pump is provided on the mixing flash evaporation unit 500A. A vacuum pump is connected to the first condensation heat exchange unit 100B and the direct-drive condensation heat exchange unit 400B. A demister is provided in each of the first flash evaporation unit 100A, the second flash evaporation unit 200A, the direct-drive flash evaporation unit 400A, and the mixing flash evaporation unit 500A. The first flash evaporation unit 100A and the first condensation heat exchange unit 100B are either an integrated structure or separate structures. The first flash evaporation unit 100A and the first condensation heat exchange unit 100B are connected through a steam exhaust channel or through a steam exhaust pipeline.

[0040] The medium in this application first undergoes flash evaporation in the direct-drive flash unit 400A. The flashed steam then enters the direct-drive condensing heat exchange unit 400B for condensation. The flashed medium then enters the first flash unit 100A, where it undergoes flash evaporation under the negative pressure environment maintained by the vacuum pump and the first condensing heat exchange unit 100B, generating first-stage flash steam. The waste liquid after flash evaporation and cooling in the first flash unit 100A enters the second flash unit 200A and undergoes flash evaporation under the negative pressure environment maintained by the ejector 300A. The medium after flash evaporation in the second flash unit 200A enters the mixing flash unit 500A for flash evaporation again and undergoes flash evaporation under the negative pressure environment maintained by the mixing ejector 300B. The waste liquid after multi-effect flash evaporation and cooling finally exits the phase change mixing direct-drive heat pump.

[0041] The condensate generated by the direct-drive condensing heat exchange unit 400B, the mixed condensing heat exchange unit 500B, the second condensing heat exchange unit 200B, and the first condensing heat exchange unit 100B in this embodiment can be stored or used in the next process stage. Specific application scenarios will not be elaborated in this embodiment.

[0042] The flash steam from the first flash unit 100A, after being demisted, enters the first condensing heat exchange unit 100B, where it heats the water to be heated, condenses, and discharges the condensate. The flash steam from the second flash unit 200A, after being demisted, enters the exhaust steam inlet 310A of the ejector 300A, where it mixes with the driving steam entering from the driving steam inlet 320A. After mixing and heating, the mixture steam exits through the mixed steam outlet 330A into the second condensing heat exchange unit 200B. Similarly, the steam generated by the mixing flash unit 500A enters the mixing ejector 300B and finally enters the mixing condensing heat exchange unit 500B, heating the water to be heated by the high-efficiency condenser, thus improving the thermal quality.

[0043] The water to be heated first passes through the direct-drive condensing heat exchange unit 400B and the first condensing heat exchange unit 100B and is heated by low-temperature flash steam. After heating, it enters the second condensing heat exchange unit 200B for thermal quality improvement, and then enters the mixing condensing heat exchange unit 500B for further quality improvement. After absorbing heat and raising the temperature, it is discharged from the phase change mixing direct-drive heat pump.

[0044] The first flash unit 100A has a medium inlet at its upper end for the flashing medium. The flashing medium can be desulfurization slurry, blast furnace slag flushing water, or a non-clean medium. For corrosive media, an anti-corrosion coating can be applied inside the first flash unit 100A. The first flash unit 100A and the second flash unit 200A can be arranged vertically, connected by pipes or channels, and the medium flows under its own weight. In special environments, they can also be arranged in parallel, or driven by a pump unit when gravity is not possible. The specific arrangement depends on the actual situation. The first flash unit 100A is a closed body with no specific shape limit, preferably a tank or rectangular shape. The material can be carbon steel such as Q235B / Q345R, which is relatively low in cost, has good mechanical strength, and is suitable for environments without strong corrosiveness, such as the treatment of some ordinary industrial water. Stainless steel such as 304 or 316L can also be used, which has good corrosion resistance, especially when facing corrosive substances such as acids and alkalis. Stainless steel also has good weldability and formability. Sometimes, other materials are selected based on specific application requirements. Titanium alloy or other non-metallic materials, such as fiberglass reinforced plastic (FRP), can be selected to meet specific corrosion resistance requirements or lightweight design needs. If the first condensing heat exchange unit 100B is separate from the first flash evaporation unit 100A, the two are connected by a pipe for the flow of exhaust steam. If it is integrated with the first flash evaporation unit 100A, a partition plate is installed inside the shell, dividing the shell into a flash chamber and a heat exchange chamber. A demister is installed in the flash chamber, and the partition plate has channels, i.e., holes, for the passage of flash exhaust steam. The chamber is equipped with heat exchange pipes. The specific arrangement of the heat exchange pipes will not be described in detail here. Another partition plate divides the flash chamber and the heat exchange chamber into two effects. That is, a medium channel is provided on the partition plate located between the first flash unit 100A and the second flash unit 200A. Similarly, the position and arrangement structure of the direct drive flash unit 400A and the direct drive condensing heat exchange unit 400B, the mixed flash unit 500A and the mixed condensing heat exchange unit 500B are the same as those of the first condensing heat exchange unit 100B.

[0045] This application provides a parallel arrangement of multiple ejectors 300A, which facilitates the integrated modular installation of the equipment. At the same time, the steam exhaust inlet 310A of the multiple ejectors 300A can achieve multi-point air intake, thereby improving the gas flow rate.

[0046] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and all such equivalent transformations fall within the protection scope of the present invention.

Claims

1. A phase change hybrid heat transfer direct-drive heat pump, including: The first flash unit (100A) and the medium and steam exhaust after flashing in the first flash unit (100A) respectively enter the second flash unit (200A) and the first condensation heat exchange unit (100B). The feature is that an ejector (300A) is provided between the second flash unit (200A) and the second condensation heat exchange unit (200B). The medium to be heated passes through the first condensation heat exchange unit (100B) and the second condensation heat exchange unit (200B) in sequence.

2. The phase change hybrid heat pump with direct drive according to claim 1, characterized in that, The ejector (300A) is provided with a steam exhaust inlet (310A) communicating with the second flash evaporation unit (200A), a drive steam inlet (320A), and a mixed steam outlet (330A) communicating with the second condensation heat exchange unit (200B).

3. The phase change hybrid heat pump with direct drive according to claim 1, characterized in that, Multiple of the aforementioned injectors (300A) are connected in parallel.

4. The phase change hybrid heat pump with direct drive according to claim 1, characterized in that, The first condensation heat exchange unit (100B) is connected to a vacuum pump.

5. The phase change hybrid heat pump with direct drive according to claim 1, characterized in that, The first flash unit (100A) is equipped with a demister.

6. The phase change hybrid heat pump with direct drive according to claim 1, characterized in that, The first flash evaporation unit (100A) and the first condensation heat exchange unit (100B) are either an integrated structure or separate structures.

7. The phase change hybrid heat pump with direct drive according to claim 1 or 6, characterized in that, The first flash evaporation unit (100A) and the first condensation heat exchange unit (100B) are connected through a steam exhaust channel or through a steam exhaust pipeline.

8. The phase change hybrid heat pump with direct drive according to claim 1, characterized in that, It also includes at least one set of direct-drive flash evaporation unit (400A) and direct-drive condensation heat exchange unit (400B). The medium and steam exhaust after flash evaporation in the direct-drive flash evaporation unit (400A) enter the first flash evaporation unit (100A) and the direct-drive condensation heat exchange unit (400B) respectively. The medium to be heated passes through the direct-drive condensation heat exchange unit (400B) and the first condensation heat exchange unit (100B) in sequence.

9. The phase change hybrid heat pump according to claim 1, characterized in that, It also includes at least one set of mixing flash evaporation unit (500A) and mixing condensation heat exchange unit (500B), and a mixing ejector (300B) is provided between the mixing flash evaporation unit (500A) and the mixing condensation heat exchange unit (500B). The medium to be heated passes through the first condensation heat exchange unit (100B), the second condensation heat exchange unit (200B) and the mixing condensation heat exchange unit (500B) in sequence.

10. The phase change hybrid heat pump with direct drive according to claim 8, characterized in that, It also includes at least one set of mixing flash evaporation unit (500A) and mixing condensation heat exchange unit (500B), and a mixing ejector (300B) is provided between the mixing flash evaporation unit (500A) and the mixing condensation heat exchange unit (500B). The medium to be heated passes sequentially through the direct drive condensation heat exchange unit (400B), the first condensation heat exchange unit (100B), the second condensation heat exchange unit (200B) and the mixing condensation heat exchange unit (500B).

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