[go: up one dir, main page]

EP3879124A1 - Ejektor für wärmerückgewinnungs- oder -arbeitsrückgewinnungssystem sowie wärmerückgewinnungs- oder arbeitsrückgewinnungssystem - Google Patents

Ejektor für wärmerückgewinnungs- oder -arbeitsrückgewinnungssystem sowie wärmerückgewinnungs- oder arbeitsrückgewinnungssystem Download PDF

Info

Publication number
EP3879124A1
EP3879124A1 EP20213788.1A EP20213788A EP3879124A1 EP 3879124 A1 EP3879124 A1 EP 3879124A1 EP 20213788 A EP20213788 A EP 20213788A EP 3879124 A1 EP3879124 A1 EP 3879124A1
Authority
EP
European Patent Office
Prior art keywords
pressure fluid
segment
diffusion
ejector
heat recovery
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
EP20213788.1A
Other languages
English (en)
French (fr)
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 EP3879124A1 publication Critical patent/EP3879124A1/de
Pending legal-status Critical Current

Links

Images

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
    • 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
    • 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
    • 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

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 converts the pressure of the high pressure fluid into kinetic energy, mixes with a low pressure fluid and supplies a mixed medium-pressure fluid 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 low-pressure 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 which is subsequently supplied to the compressor.
  • the efficiency of the ejector is critical to the entire system.
  • An object of at least some embodiments of the present invention is to solve or at least alleviate problems existing in the related art.
  • an ejector for a heat recovery or work recovery system which includes: a high-pressure fluid passage including a high-pressure fluid inlet and a high-pressure fluid nozzle; a low-pressure fluid passage including a low-pressure fluid inlet and a suction chamber surrounding the high-pressure fluid nozzle; a mixing chamber in fluid communication with the high-pressure fluid passage and the low-pressure fluid passage respectively; and a diffusion chamber downstream of the mixing chamber; wherein the high-pressure fluid nozzle includes a constricted segment, a throat portion, and a diffusion segment in sequence, a distal end of the diffusion segment defines a high-pressure fluid outlet, and a peripheral wall of the diffusion segment has a convex arc shape in a longitudinal section.
  • a diffusion angle at the high-pressure fluid outlet at the distal end of the diffusion segment is in a range of 0° to 10°, preferably in a range of 0° to 5°, more preferably in a range of 0° to 3°, for example, the diffusion angle is equal to 0°.
  • the peripheral wall of the diffusion segment is composed of a convex arc-shaped segment having a gradually decreasing diffusion angle.
  • the peripheral wall of the diffusion segment is composed of a convex arc-shaped segment having a parabolic shape.
  • the peripheral wall of the diffusion segment is composed of a convex circular arc-shaped segment with a consistent radius of curvature.
  • the high-pressure fluid outlet of the high-pressure fluid nozzle faces the mixing chamber, and a center line of the high-pressure fluid nozzle is collinear with a center line of the mixing chamber.
  • the suction chamber is in communication with the mixing chamber, and a transition segment having a tapered structure is located between the suction chamber and the mixing chamber.
  • the constricted segment of the high-pressure fluid nozzle is composed of a straight segment having a constant constriction angle or an arc segment having a convex or concave shape.
  • a heat recovery or work recovery system which includes the ejector according to the first aspect and, optionally, in accordance with any of the optional features thereof.
  • 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 of the compressor 83, 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 flowing out of 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 enter into a low-pressure 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 of Figure 1 includes only one ejector, but alternative systems may include a plurality of ejectors. Therefore, the ejector may be applied to various types of heat recovery or work recovery systems.
  • the ejector includes: a high-pressure fluid passage 1; a low-pressure fluid passage 2; a mixing chamber 3 in fluid communication with the high-pressure fluid passage 1 and the low-pressure fluid passage 2 respectively; and a diffusion chamber 4 downstream of the mixing chamber 3.
  • the high-pressure fluid passage 1 may include a high-pressure fluid inlet 11 and a high-pressure fluid nozzle 12.
  • the high-pressure fluid nozzle includes a constricted segment 13, a throat portion 14, and a diffusion segment 15 in sequence. A distal end of the diffusion segment 15 defines a high-pressure fluid outlet 16.
  • the high-pressure fluid outlet 16 may face the mixing chamber 3.
  • a center line of the high-pressure fluid nozzle 16 may be collinear with a center line of the mixing chamber 3.
  • the low-pressure fluid passage 2 may include a low-pressure fluid inlet 21, and a suction chamber 22 surrounding the high-pressure fluid nozzle 12.
  • the suction chamber 22 is in communication with the mixing chamber 3.
  • a transition segment 23 between the suction chamber 22 and the mixing chamber 3 has a tapered structure. That is, the cross section thereof gradually decreases.
  • the mixing chamber 3 may have a cylindrical shape having a constant cross-sectional area.
  • a high-pressure fluid MF entering through the high-pressure fluid passage 1 and a low-pressure fluid SF suctioned in through the low-pressure fluid passage 2 are sufficiently mixed so that a supersonic fluid transitions to a subsonic fluid which diffuses in the diffusion chamber 4 to restore the kinetic energy therein to a pressure, thereby forming an output flow EF of a medium-pressure fluid at the outlet 43 of the ejector, which is supplied to, for example, the inlet of the compressor.
  • a diffusion angle thereof needs to ensure full restoration of the fluid pressure and avoid the occurrence of flow separation.
  • FIG. 3 a flow simulation diagram in the ejector shown in FIG. 2 is illustrated.
  • the high-pressure fluid MF entering from the high-pressure fluid inlet is ejected from the ejector and forms a high-pressure flow core 91.
  • the low-pressure fluid SF needs to be sufficiently mixed with the high-pressure fluid MF in a potential mixed shock region 93 after passing through the fictive throat 92.
  • the entrainment ratio (which is defined as a mass flow ratio of the low-pressure fluid SF to the high-pressure fluid MF, and which is an important parameter affecting the performance of the ejector) will no longer increase, that is, the performance of the ejector can no longer be improved.
  • a peripheral wall of the high-pressure fluid nozzle includes a constricted segment 13, a throat portion 14, and a diffusion segment 15 in sequence.
  • the peripheral wall of the diffusion segment 15 of the nozzle extends straight at a constant diffusion angle ⁇ from a starting point P1 of the diffusion segment 15 to an end point P2 of the diffusion segment 15, and a total length of the diffusion segment 15 is L.
  • an angle ⁇ is between a tangent line at that point and a horizontal line, that is, the high-pressure fluid is ejected from the high-pressure fluid nozzle at a diffusion angle ⁇ . If the diffusion angle ⁇ is too large, the fictive throat is prone to early blockage.
  • FIG. 5 a partial longitudinal sectional view of a high-pressure nozzle is shown.
  • the peripheral wall of the diffusion segment 15 has a convex arc shape.
  • the so-called convex arc shape means that in the section shown in FIG. 5 , the peripheral wall is raised relative to a line C connecting the starting point P1 and the end point P2 of the diffusion segment 15 and has an arc shape.
  • the center of curvature at any point of the peripheral wall is located inwardly of the peripheral wall.
  • the high-pressure fluid nozzle has an increased internal space 49 as compared to the design of FIG. 4 , which allows for more phase changes in the high-pressure fluid nozzle; that is, more liquid evaporates into vapor, resulting in higher nozzle ejection velocity and enabling a higher efficiency of the ejector.
  • the diffusion angle of the diffusion segment 15 at the high-pressure fluid outlet 16 is in a range of 0° to 10°, preferably in a range of 0° to 5°, more preferably in a range of 0° to 3°, for example, the diffusion angle is equal to 0°, that is, the high-pressure fluid leaving the high-pressure fluid nozzle is ejected substantially horizontally.
  • the position of the fictive throat 92 related to the diffusion angle of the high-pressure fluid ejected from the high-pressure fluid nozzle is more rearward (more downstream), so that the system can operate in a larger range of operating parameters without early blockage of the fictive throat.
  • a higher efficiency of the ejector can be achieved and the operating efficiency of the entire system can be improved.
  • the peripheral wall of the diffusion segment 15 is composed of a convex arc-shaped segment having a gradually decreasing diffusion angle; that is, in the diffusion segment 15, the diffusion angle of any further downstream point on the peripheral wall is less than that of an upstream point.
  • the diffusion angle may be defined as an angle between a tangent line at a point on the peripheral wall and the horizontal line or a centerline of the ejector.
  • the diffusion angle at the starting point P1 of the diffusion segment 15 is larger than the diffusion angle at a first intermediate point P4, the diffusion angle at the first intermediate point P4 is larger than the diffusion angle at a second intermediate point P5 downstream of the first intermediate point P4, and the diffusion angle at the second intermediate point P5 is larger than the diffusion angle at the end point P2 of the diffusion segment, which is located downstream of the second intermediate point P5.
  • the diffusion angle at the end point P2 of the diffusion segment may substantially be 0°.
  • the peripheral wall of the diffusion segment 15 may be composed of a convex arc-shaped segment having a parabolic shape. In some other embodiments, the peripheral wall of the diffusion segment 15 may be composed of a convex circular arc-shaped segment with a consistent radius of curvature.
  • the constricted segment 13 of the high-pressure fluid nozzle may be composed of a straight segment having a constant constriction angle; alternatively, the constricted segment 13 may be composed of a convex arc-shaped segment or a concave arc-shaped segment.
  • the high-pressure fluid outlet 16 of the high-pressure fluid nozzle 12 faces the mixing chamber 3, and the center line of the high-pressure fluid nozzle 12 is collinear with the center line of the mixing chamber 3.
  • the segment between the point P1 and the point P2 is drawn from the end point P2 of the
  • a heat recovery or work recovery system may include an ejector as described above.

Landscapes

  • 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)
EP20213788.1A 2020-03-10 2020-12-14 Ejektor für wärmerückgewinnungs- oder -arbeitsrückgewinnungssystem sowie wärmerückgewinnungs- oder arbeitsrückgewinnungssystem Pending EP3879124A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010161694.2A CN113375363A (zh) 2020-03-10 2020-03-10 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
EP3879124A1 true EP3879124A1 (de) 2021-09-15

Family

ID=73835426

Family Applications (1)

Application Number Title Priority Date Filing Date
EP20213788.1A Pending EP3879124A1 (de) 2020-03-10 2020-12-14 Ejektor für wärmerückgewinnungs- oder -arbeitsrückgewinnungssystem sowie wärmerückgewinnungs- oder arbeitsrückgewinnungssystem

Country Status (2)

Country Link
EP (1) EP3879124A1 (de)
CN (1) CN113375363A (de)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE662250C (de) * 1936-01-21 1938-07-09 Gerhard Fehst Dipl Ing Strahlverdichter, bei welchem dem anzusaugenden Mittel vor dem Zusammentreffen mit dem Treibmittel eine gewisse Geschwindigkeit erteilt ist
FR960172A (de) * 1950-04-14
EP3093585A1 (de) * 2015-05-15 2016-11-16 Carrier Corporation Ejektoren
CN106391341A (zh) * 2016-09-07 2017-02-15 中国神华能源股份有限公司 喷嘴及蒸汽引射器

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR960172A (de) * 1950-04-14
DE662250C (de) * 1936-01-21 1938-07-09 Gerhard Fehst Dipl Ing Strahlverdichter, bei welchem dem anzusaugenden Mittel vor dem Zusammentreffen mit dem Treibmittel eine gewisse Geschwindigkeit erteilt ist
EP3093585A1 (de) * 2015-05-15 2016-11-16 Carrier Corporation Ejektoren
CN106391341A (zh) * 2016-09-07 2017-02-15 中国神华能源股份有限公司 喷嘴及蒸汽引射器

Also Published As

Publication number Publication date
CN113375363A (zh) 2021-09-10

Similar Documents

Publication Publication Date Title
RU2379525C2 (ru) Сборка трубы для использования в газотурбинном двигателе, обводная труба и газотурбинный двигатель
US8303258B2 (en) Fan platform fin
US20110088379A1 (en) Exhaust gas diffuser
US10215196B2 (en) Ejector using swirl flow
JP6423718B2 (ja) ガスタービンから排気ガスを排出する方法、および最適化された構成を有する排気アセンブリ
EP2691706B1 (de) Auswerfermischer
US8690519B2 (en) Wet gas compressor systems
US9347336B2 (en) Steam valve apparatus
CN102434233B (zh) 一种小型汽轮机的排汽缸
US20140157807A1 (en) Ejector
EP3879124A1 (de) Ejektor für wärmerückgewinnungs- oder -arbeitsrückgewinnungssystem sowie wärmerückgewinnungs- oder arbeitsrückgewinnungssystem
JP2006183586A (ja) エジェクタおよび冷凍システム
CN113646520B (zh) 非轴对称次级管道部分
JPH11148733A (ja) 冷凍サイクル用エジェクタ
EP3859165A1 (de) Ejektor für wärmerückgewinnungs- oder -arbeitsrückgewinnungssystem sowie wärmerückgewinnungs- oder arbeitsrückgewinnungssystem
US20180306365A1 (en) Bend pipe and fluid machine comprising same
EP3858472B1 (de) Ejektor für ein wärmerückgewinnungs- oder arbeitsrückgewinnungssystem und fluidmischverfahren
JPH1137577A (ja) ノズル装置
CN215409379U (zh) 引射结构、压缩机组件以及具有其的制冷设备
KR102587343B1 (ko) 저손실 곡관 배기덕트
CN106286420A (zh) 波瓣抽空器
CN104989529B (zh) 控制涡轮叶栅顶部端区流动的闭环式引气射流系统
RU184774U1 (ru) Выходное устройство газотурбинного двигателя
KR20220135553A (ko) 응축수 배관의 수격 방지 장치
CN108019293B (zh) 一种多级重入式涡轮

Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE

17P Request for examination filed

Effective date: 20220309

RBV Designated contracting states (corrected)

Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: EXAMINATION IS IN PROGRESS

17Q First examination report despatched

Effective date: 20230727

GRAP Despatch of communication of intention to grant a patent

Free format text: ORIGINAL CODE: EPIDOSNIGR1

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: GRANT OF PATENT IS INTENDED

INTG Intention to grant announced

Effective date: 20250410