EP3859165A1 - Éjecteur pour un système de récupération de chaleur ou de récupération de travail, et système de récupération de chaleur ou de récupération de travail - Google Patents

Éjecteur pour un système de récupération de chaleur ou de récupération de travail, et système de récupération de chaleur ou de récupération de travail Download PDF

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Publication number
EP3859165A1
EP3859165A1 EP20215178.3A EP20215178A EP3859165A1 EP 3859165 A1 EP3859165 A1 EP 3859165A1 EP 20215178 A EP20215178 A EP 20215178A EP 3859165 A1 EP3859165 A1 EP 3859165A1
Authority
EP
European Patent Office
Prior art keywords
diffusion
section
ejector
chamber
diffusion angle
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP20215178.3A
Other languages
German (de)
English (en)
Inventor
Wei Zhang
Parmesh Verma
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Carrier Corp
Original Assignee
Carrier Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Carrier Corp filed Critical Carrier Corp
Publication of EP3859165A1 publication Critical patent/EP3859165A1/fr
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/14—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid
    • F04F5/24—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow the inducing fluid being elastic fluid displacing liquids, e.g. containing solids, or liquids and elastic fluids
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/08—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using ejectors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/44—Component parts, details, or accessories not provided for in, or of interest apart from, groups F04F5/02 - F04F5/42
    • F04F5/46—Arrangements of nozzles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04F—PUMPING OF FLUID BY DIRECT CONTACT OF ANOTHER FLUID OR BY USING INERTIA OF FLUID TO BE PUMPED; SIPHONS
    • F04F5/00—Jet pumps, i.e. devices in which flow is induced by pressure drop caused by velocity of another fluid flow
    • F04F5/54—Installations characterised by use of jet pumps, e.g. combinations of two or more jet pumps of different type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B27/00—Machines, plants or systems, using particular sources of energy
    • F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines

Definitions

  • the present disclosure relates to the field of heat recovery or work recovery systems. More specifically, the present disclosure relates to an ejector for a heat recovery or work recovery system, and a heat recovery or work recovery system having such an ejector.
  • an ejector In commercial heat recovery or work recovery systems, especially systems that require a large pressure differential, an ejector is used to improve efficiency.
  • the ejector typically pressurizes a suction fluid by means of a high-pressure fluid and supplies mixed fluids to a compressor inlet, thereby increasing the pressure of fluid at the compressor inlet, reducing the requirements on the capacity of the compressor and improving the efficiency of the system.
  • the ejector usually includes a high-pressure fluid nozzle to convert the high-pressure fluid into a high-momentum fluid.
  • the suction fluid is suctioned in with the high-momentum fluid and mixed with the high-momentum fluid in a mixing chamber, then diffuses in a diffusion chamber to increase the pressure of the fluid and is subsequently supplied to the compressor.
  • a wall of the diffusion chamber has a diffusion angle. An effective recovery pressure needs to be considered and an occurrence of flow separation needs to be avoided in designing the diffusion angle.
  • a length of the ejector, especially a length of the diffusion chamber is limited by the actual application scenario.
  • An object of the present disclosure is to solve or at least alleviate the problems existing in the related art.
  • an ejector for a heat recovery or work recovery system which includes:
  • the second diffusion angle has a positive value or a negative value.
  • the first diffusion angle is between 3° and 10°, and an absolute value of the second diffusion angle is greater than or equal to 0° and smaller than an absolute value of the first diffusion angle.
  • the diffusion chamber wall includes a first section and a second section, the first section has a constant diffusion angle, and the first position is taken from the first section; the second section has a constant diffusion angle, and the second position is taken from the second section.
  • first section and the second section adjoin to each other.
  • the diffusion chamber wall has an arc-shaped section having a gradually decreasing diffusion angle, and the first position and the second position are both taken from the arc-shaped section.
  • the diffusion chamber wall is composed of a first section having a constant diffusion angle and a second section having a constant diffusion angle, or the diffusion chamber wall is composed of an arc-shaped section having a gradually decreasing diffusion angle.
  • the length D2 of the diffusion chamber is in a range of 0.8D1 to 3D1, and D1 is the length of the mixing chamber.
  • the high-pressure fluid passage includes a high-pressure fluid inlet and a high-pressure fluid nozzle
  • the high-pressure fluid nozzle includes a constricted section, a throat portion, a diffusion section, and a high-pressure fluid outlet in sequence, and the high-pressure fluid outlet faces toward the mixing chamber
  • the suction fluid passage includes a suction fluid inlet and a suction chamber surrounding the high-pressure fluid nozzle, the suction chamber is in communication with the mixing chamber, and a tapered transition section is located between the suction chamber and the mixing chamber.
  • a heat recovery or work recovery system including the ejector as described herein with reference to the first aspect of the invention is provided.
  • the work recovery system may include a compressor 83, an outlet of the compressor 83 is connected to an inlet of a condenser 82 downstream thereof, and an outlet of the condenser 82 is connected to a high-pressure fluid inlet 11 of an ejector 80.
  • a fluid outlet 43 of the ejector 80 is connected to a separator 84.
  • a fluid exiting from the fluid outlet 43 of the ejector 80 is separated in the separator, wherein a gas phase returns to an inlet of the compressor 83, and a liquid phase passes through a valve 85 and an evaporator 86 and then arrives at a suction fluid inlet 21 of the ejector 80.
  • the ejector 80 is used in the work recovery system as shown in FIG. 1 .
  • the ejector 80 may also be applied to other types of more complicated work recovery systems.
  • the ejector 80 may also be applied to a heat recovery system, such as a heat recovery system including a generator.
  • the work recovery system includes only one ejector, and in alternative examples, the system may include a plurality of ejectors. Therefore, the ejector according to various examples can be applied to various types of heat recovery or work recovery systems.
  • the ejector includes: a high-pressure fluid passage 1; a suction fluid passage 2; a mixing chamber 3 in fluid communication with the high-pressure fluid passage 1 and the suction fluid passage 2 respectively; and a diffusion chamber 4 downstream of the mixing chamber 3.
  • the high-pressure fluid channel 1 includes a high-pressure fluid inlet 11, and a high-pressure fluid nozzle which includes a constricted section 13, a throat portion 14, a diffusion section 15 and a high-pressure fluid outlet 16 in sequence, and the high-pressure fluid outlet 16 faces toward the mixing chamber 3.
  • the suction fluid passage 2 includes a suction fluid inlet 21 and a suction chamber 22 surrounding the high-pressure fluid nozzle, and the suction chamber 22 is in communication with the mixing chamber 3.
  • a transition section 23 between the suction chamber 22 and the mixing chamber 3 has a tapered structure.
  • the mixing chamber 3 may be of a cylindrical shape having an equal sectional area, and a high-pressure fluid entering the mixing chamber 3 through the high-pressure fluid passage 1 is sufficiently mixed with a suction fluid suctioned through the suction fluid passage 2 in the mixing chamber 3 to form a subsonic velocity fluid.
  • This fluid diffuses in the diffusion chamber 4 to restore pressure from the kinetic energy therein, thereby forming a medium-pressure fluid to be supplied to for example a compressor inlet.
  • the diffusion angle needs to ensure that the fluid pressure is sufficiently restored.
  • the diffusion angle should not be too large, which would otherwise cause flow separation, thereby resulting in local turbulence and fluid energy loss.
  • the length of the diffusion chamber 4 is limited by the actual application environment, such as the size of a heat recovery or work recovery system or device. Therefore, it is desirable to provide an ejector capable of sufficiently recovering fluid pressure and as compact as possible.
  • the diffusion chamber 4 has a diffusion chamber wall surrounding the diffusion chamber, wherein the diffusion chamber wall has a first position A and a second position B downstream of the first position A along a fluid flow direction.
  • the first position A has a first diffusion angle ⁇
  • the second position B has a second diffusion angle ⁇ smaller than the first diffusion angle ⁇ .
  • the diffusion angle at a position in the diffusion wall refers to an angle formed between a tangent line at that position and a central line direction of the diffusion chamber in the section for example shown in FIG. 2 or 3 .
  • the diffusion chamber wall is composed of a first section 41 and a second section 42.
  • the first section 41 has a constant diffusion angle, and the shape of the first section 41 is substantially a cone shape gradually diverging in the fluid direction.
  • the first position A is taken from the first section 41.
  • the second section 42 has a constant diffusion angle, and the second position is taken from the second section 42. Therefore, the values of the diffusion angles in any position of the first section 41 are equal to the first diffusion angle ⁇ , and the values of the diffusion angles in any position of the second section 42 are equal to the second diffusion angle ⁇ .
  • the first diffusion angle ⁇ is a positive value, such as in a range of 3° to 10°, such as in a range of 3° to 6°, or such as in a range of 3° to 4.5°.
  • the first diffusion angle ⁇ may be 3°, 4.5°, 6°, or a range of 3° to 4.5°, or a range of 4.5° to 6°.
  • the diffusion angle ⁇ of the second section may be a positive value or a negative value, wherein a positive value indicates that the diffusion chamber wall gradually diverges at that angle, and a negative value indicates that the diffusion chamber wall gradually converges at that angle. In the example shown in FIG.
  • the second section 42 gradually converges at an angle value of the second diffusion angle ⁇ , that is, the second diffusion angle ⁇ is a negative value.
  • the second diffusion angle ⁇ may also be a positive value, that is, the diffusion chamber wall gradually diverges in the second section 42 at a value of the second diffusion angle ⁇ different from the first diffusion angle ⁇ .
  • an absolute value of the second diffusion angle ⁇ may be in a range of greater than or equal to 0° and smaller than the first diffusion angle ⁇ .
  • the diffusion chamber wall is composed of the first section 41 and the second section 42 with different diffusion angles from each other.
  • the diffusion chamber wall may have more sections.
  • the third section may have a third section downstream of the second section in the fluid flow direction.
  • the third section is also a section having a constant diffusion angle, and it has a third diffusion angle smaller than the second diffusion angle, or the third section may be an arc-shaped section or the like.
  • first section 41 and the second section 42 may directly adjoin to each other, and in an alternative example, the first section 41 and the second section 42 may be separated by other sections.
  • an angle ⁇ formed by a connection line of the inlet (point A) and the outlet (point C) on the diffusion chamber wall with the fluid direction may be referred to as a net diffusion angle ⁇ of the diffusion chamber 4.
  • the absolute values of the first diffusion angle ⁇ and the second diffusion angle ⁇ may be both greater than the net diffusion angle ⁇ .
  • one of the absolute values of the first diffusion angle ⁇ and the second diffusion angle ⁇ may be greater than the net diffusion angle ⁇ and the other may be less than the net diffusion angle ⁇ .
  • the diffusion chamber wall includes an arc-shaped section having a gradually decreasing diffusion angle
  • the first position A and the second position B are taken from the arc-shaped section.
  • the first diffusion angle ⁇ is an angle formed between a tangent line L 1 at the position A and L 4 representing the center line direction
  • the second diffusion angle ⁇ is an angle formed between a tangent line L 2 at the position B and L 5 representing the center line direction.
  • an angle ⁇ formed between a connection line L 3 of the diffusion chamber inlet (point A) and the diffusion chamber outlet (point C) and L 4 representing the center line direction may be referred to as the net diffusion angle.
  • An arc-shaped section having a gradually decreasing diffusion angle means that in the arc-shaped section, the diffusion angle at any position is greater than the diffusion angle at any point downstream of said position.
  • the diffusion chamber wall is entirely composed of an arc-shaped section having a gradually decreasing diffusion angle.
  • the diffusion chamber wall may have other sections, such as straight sections having a certain diffusion angle in FIG. 2 or other types of arc-shaped sections.
  • a length D2 of the diffusion chamber is in a range of 0.8D1 to 3D1, wherein D1 is a length of the mixing chamber.
  • the length D2 of the diffusion chamber may be in a range of 0.8D1 to 2D1, or in a range of 0.8D1 to 1.5D1, or in a range of 0.8D1 to 1.2D1.
  • the length D2 of the diffusion chamber is less than the length D1 of the mixing chamber, such as in a range of 0.7D1 to 0.9D1 or in a range of 0.8D1 to 0.9D1.
  • FIGS. 4 and 5 a simulated pressure comparison diagram and a simulated speed comparison diagram of the ejector according to the present disclosure and a conventional ejector are shown.
  • the upper diagram shows a diffusion chamber having a constant diffusion angle of 3°
  • the lower diagram shows a diffusion chamber which has a first section having a diffusion angle of 4.5° and a second section having a diffusion section of 3°, wherein a darker color indicates a greater pressure.
  • points F and G are equal-pressure points, and it can therefore be seen that the diffusion chamber according to the present disclosure can recover to the same pressure in a shorter length.
  • the diffusion chamber according to the present disclosure can restore the pressure of the fluid more sufficiently in a case of a diffusion zone of the same length.
  • the upper diagram shows a diffusion chamber having a constant diffusion angle of 3°
  • the lower diagram shows a diffusion chamber according to the present disclosure, which has a first section having a diffusion angle of 4.5° and a second section having a diffusion section of 3°, wherein a darker color indicates a slower speed. It can be seen from the diagrams that the diffusion chamber according to the present disclosure can obtain a lower-speed fluid (that is, a higher pressure) in a case of a diffusion zone of the same length.
  • the pressure can be restored more sufficiently through a section having a larger diffusion angle close to the inlet zone as well as a flow separation can be prevented through the subsequent section, the pressure can be sufficiently restored in a shorter distance, thereby making it adapted to a more compact use environment.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Jet Pumps And Other Pumps (AREA)
EP20215178.3A 2020-02-03 2020-12-17 Éjecteur pour un système de récupération de chaleur ou de récupération de travail, et système de récupération de chaleur ou de récupération de travail Pending EP3859165A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010078568.0A CN113203216A (zh) 2020-02-03 2020-02-03 用于热回收或功回收系统的喷射器和热回收或功回收系统

Publications (1)

Publication Number Publication Date
EP3859165A1 true EP3859165A1 (fr) 2021-08-04

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Application Number Title Priority Date Filing Date
EP20215178.3A Pending EP3859165A1 (fr) 2020-02-03 2020-12-17 Éjecteur pour un système de récupération de chaleur ou de récupération de travail, et système de récupération de chaleur ou de récupération de travail

Country Status (2)

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EP (1) EP3859165A1 (fr)
CN (1) CN113203216A (fr)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494296A (en) * 1968-06-14 1970-02-10 Gen Electric Diffuser
JP2010116927A (ja) * 2008-03-12 2010-05-27 Denso Corp エジェクタ
WO2012115698A1 (fr) * 2011-02-23 2012-08-30 Carrier Corporation Éjecteur
EP3040650A1 (fr) * 2014-12-30 2016-07-06 Samsung Electronics Co., Ltd. Éjecteur et appareil de refroidissement comprenant celui-ci

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3494296A (en) * 1968-06-14 1970-02-10 Gen Electric Diffuser
JP2010116927A (ja) * 2008-03-12 2010-05-27 Denso Corp エジェクタ
WO2012115698A1 (fr) * 2011-02-23 2012-08-30 Carrier Corporation Éjecteur
EP3040650A1 (fr) * 2014-12-30 2016-07-06 Samsung Electronics Co., Ltd. Éjecteur et appareil de refroidissement comprenant celui-ci

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CN113203216A (zh) 2021-08-03

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