CN110579048A - Horizontal separation container and refrigerating system - Google Patents
Horizontal separation container and refrigerating system Download PDFInfo
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- CN110579048A CN110579048A CN201810590297.XA CN201810590297A CN110579048A CN 110579048 A CN110579048 A CN 110579048A CN 201810590297 A CN201810590297 A CN 201810590297A CN 110579048 A CN110579048 A CN 110579048A
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- Prior art keywords
- separation
- central axis
- horizontal
- cylinder
- barrel
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- 238000000926 separation method Methods 0.000 title claims abstract description 226
- 239000007788 liquid Substances 0.000 claims abstract description 165
- 238000005057 refrigeration Methods 0.000 claims abstract description 28
- 239000003507 refrigerant Substances 0.000 claims description 77
- 238000012937 correction Methods 0.000 claims description 13
- 230000005484 gravity Effects 0.000 claims description 10
- 230000001133 acceleration Effects 0.000 claims description 7
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 30
- 229910021529 ammonia Inorganic materials 0.000 description 15
- 238000005192 partition Methods 0.000 description 9
- 238000000034 method Methods 0.000 description 5
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 4
- 238000009795 derivation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 229910002092 carbon dioxide Inorganic materials 0.000 description 2
- 239000001569 carbon dioxide Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000001627 detrimental effect Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- -1 freon Chemical compound 0.000 description 1
- WABPQHHGFIMREM-UHFFFAOYSA-N lead(0) Chemical compound [Pb] WABPQHHGFIMREM-UHFFFAOYSA-N 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000009491 slugging Methods 0.000 description 1
- 239000000725 suspension Substances 0.000 description 1
Classifications
-
- 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
- F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
- F25B43/02—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat for separating lubricants from the refrigerant
Abstract
The invention discloses a horizontal separation container, which comprises a cylinder body, wherein the central axis of the cylinder body is horizontally arranged, the cylinder body is provided with an air inlet and an air outlet which are communicated with the interior of the cylinder body, the central axis of the air outlet is vertical to the central axis of the cylinder body, and the distance between the projection point of the central axis of the air outlet on the plane of the central axis of the cylinder body and the projection point of the central axis of the air inlet on the plane of the central axis of the cylinder body is greater than or equal to the separation length of the. In addition, the invention also discloses a refrigerating system with the horizontal separation container. The horizontal separation container and the refrigeration system provided by the invention can prevent the liquid impact phenomenon and ensure the normal operation of the compressor.
Description
Technical Field
the invention relates to the technical field of refrigeration, in particular to a horizontal separation container and a refrigeration system.
background
at present, in traditional refrigeration cycle system, can set up the separator vessel between evaporimeter and compressor usually to the realization can utilize the separator vessel to separate the flash steam that refrigerant liquid produced behind the throttle in the refrigeration cycle process, and the refrigerant liquid drop of smuggleing secretly in the separation evaporimeter backsteam, and then probably cause the purpose of damage to the compressor when reaching to avoid refrigerant liquid drop or flash steam to get into in the compressor. However, the design of the positions of the air inlet and the air return port of the existing separation container is not reasonable enough, so that in the operation process of a refrigeration system, when steam in an evaporator enters the separation container, airflow directly enters the compressor through the air outlet at a high speed, a liquid impact phenomenon is caused, and the normal operation of the compressor is seriously influenced.
Disclosure of Invention
In view of the above problems in the prior art, an object of the present invention is to provide a horizontal separation vessel and a refrigeration system, which can avoid the occurrence of liquid slugging, effectively ensure the normal operation of a compressor, and reduce economic loss.
In order to achieve the above purpose, the embodiments of the present invention provide the following technical solutions:
In a first aspect, the present invention discloses a horizontal separation vessel comprising
The liquid drop separation device comprises a barrel, wherein the central axis of the barrel is horizontally arranged, the barrel is provided with an air inlet and an air return port which are communicated with the interior of the barrel, the central axis of the air return port is perpendicular to the central axis of the barrel, the projection of the central axis of the air return port on the plane of the central axis of the barrel is a first projection point, the projection of the central axis of the air inlet on the plane of the central axis of the barrel is a second projection point, the distance between the first projection point and the second projection point is the separation length of the barrel, and the separation length of the barrel is greater than or equal to the actual separation length of liquid drops in a separation state in the barrel;
When the liquid drops in the separation state enter the cylinder from the air inlet, the actual separation length is the distance between a projection point of the liquid drops on the plane where the central axis of the cylinder is located and a contact point of the liquid drops, which is contacted with the plane where the central axis of the cylinder is located, when the liquid drops move to the plane where the central axis of the cylinder is located at the separation speed.
As an alternative implementation, in an embodiment of the first aspect of the invention, the separation speed is a vertical separation speed Utand horizontal separation velocity UhThe rate of closure of (a), wherein,
The vertical separation speed
The horizontal separation speed
H is the distance from the air inlet to the plane where the central axis of the cylinder body is located, and the unit of h is m;
l is the distance between the first projection point and the second projection point, and the unit of L is m;
f is a correction value;
CDIs a coefficient of resistance;
g is the acceleration of gravity;
ρvThe density of the boil-off gas is expressed in kg/m 3;
ρLRefrigerant liquid density in kg/m 3;
d is the diameter of the refrigerant droplet, which is given in m.
As an alternative implementation manner, in an embodiment of the first aspect of the present invention, the horizontal separation vessel further includes at least one liquid outlet, each of the liquid outlets is disposed on a side of the cylinder away from the return air inlet, and a vortex preventing plate is disposed in each of the liquid outlets.
As an optional implementation manner, in an embodiment of the first aspect of the present invention, the vortex preventing plate includes a top plate and a plurality of partition plates disposed on a lower end surface of the top plate, and a preset included angle is formed between two adjacent partition plates.
as an optional implementation manner, in an embodiment of the first aspect of the present invention, the horizontal separation vessel further includes an oil collecting pipe, the oil collecting pipe is disposed on a side of the cylinder body away from the air return opening, and the oil collecting pipe is spaced from the liquid outlet.
In a second aspect, the invention also discloses another horizontal separation vessel comprising
The liquid drop separation device comprises a barrel, wherein the central axis of the barrel is horizontally arranged, the barrel is provided with two air inlets communicated with the interior of the barrel and an air return port arranged between the two air inlets, the two air inlets are symmetrically arranged relative to the central axis of the air return port, the distance between the two air inlets is the separation length of the barrel, and the separation length is larger than or equal to the actual separation length of liquid drops in a separation state in the barrel;
When two liquid drops in a separated state enter the cylinder body from the two air inlets respectively, the distance between a projection point of one liquid drop on the plane where the central axis of the cylinder body is located and a contact point, which is in contact with the plane where the central axis of the cylinder body is located, when one liquid drop runs to the plane where the central axis of the cylinder body at a separation speed, is a first distance, the distance between a projection point of the other liquid drop on the plane where the central axis of the cylinder body is located and a contact point, which is in contact with the plane where the central axis of the cylinder body is located, when the other liquid drop runs to the plane where the central axis of the cylinder body at the separation speed, is a second distance, and the actual separation length is the sum of the first distance and the second distance.
As an optional implementation manner, in an embodiment of the second aspect of the present invention, the two air inlets are respectively used for connecting a first air inlet pipe and a second air inlet pipe, and both the first air inlet pipe and the second air inlet pipe are straight pipes or bent pipes;
When the first air inlet pipe and the second air inlet pipe are both straight pipes, the distance between the central axis of the first air inlet pipe and the central axis of the second air inlet pipe is the separation length of the cylinder;
When first intake pipe and second intake pipe are the return bend, first intake pipe stretches into the inside one end of barrel has first gas outlet, the second intake pipe stretches into the inside one end of barrel has the second gas outlet, first gas outlet extremely the distance of second gas outlet does the separation length of barrel.
As an optional implementation manner, in an embodiment of the second aspect of the present invention, the first air intake pipe includes a first horizontal portion and a first vertical portion fixedly connected to the first horizontal portion, the second air intake pipe includes a second horizontal portion and a second vertical portion fixedly connected to the second horizontal portion, the first vertical portion and the second vertical portion are both located outside the barrel, the first horizontal portion and the second horizontal portion are both located inside the barrel, the first horizontal portion has the first air outlet, the second horizontal portion has the second air outlet, and an outlet direction of the first air outlet is opposite to an outlet direction of the second air outlet.
As an alternative, in an embodiment of the second aspect of the invention, the separation speed is a vertical separation speed Utand horizontal separation velocity UhThe rate of closure of (a), wherein,
The vertical separation speed
The horizontal separation speed
H is the distance from any air inlet to the plane where the central axis of the cylinder body is located, and the unit of h is m;
L is the distance between two of the air inlets, and the unit of L is m;
f is a correction value;
CDIs a coefficient of resistance;
g is the acceleration of gravity;
ρvIn terms of boil-off gas density, it is expressed in kg/m3；
ρLIs the density of the refrigerant liquid, and has a unit of kg/m3；
d is the diameter of the refrigerant droplet, which is given in m.
In a third aspect, the present invention discloses a refrigeration system comprising a horizontal separation vessel as described in the first aspect above or comprising another horizontal separation vessel as described in the second aspect above.
as an alternative implementation manner, in an embodiment of the third aspect of the present invention, the horizontal separation vessel further includes at least one liquid outlet, each of the liquid outlets is disposed on a side of the cylinder away from the return air inlet, and a vortex preventing plate is disposed in each of the liquid outlets.
as an optional implementation manner, in an embodiment of the third aspect of the present invention, the vortex preventing plate includes a top plate and a plurality of partition plates disposed on a lower end surface of the top plate, and a preset included angle is formed between two adjacent partition plates.
as an alternative, in an embodiment of the third aspect of the present invention, the horizontal separation vessel further includes an oil collecting pipe, the oil collecting pipe is disposed on a side of the cylinder body away from the air return opening, and the oil collecting pipe is spaced from the liquid outlet.
Compared with the prior art, according to the horizontal separation container and the refrigeration system provided by the embodiment of the invention, the distance between the projection point of the central axis of the return air port on the plane of the central axis of the cylinder and the projection point of the central axis of the air inlet on the plane of the central axis of the cylinder is larger than or equal to the actual separation length of the cylinder, or the distance between the two air inlets is larger than or equal to the actual separation length of the cylinder, so that the effective separation of refrigerant liquid drops and gas contained in the steam entering the separation container from the air inlet is realized, the steam entering the compressor from the return air port is effectively ensured not to contain or basically not to contain the refrigerant liquid drops, the liquid impact phenomenon of the compressor is effectively solved, the normal operation of the compressor is ensured, and the economic loss is reduced.
Drawings
in order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural view of a horizontal separation vessel according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a vortex breaker of the horizontal separation vessel according to an embodiment of the present invention;
FIG. 3 is a side view of a horizontal separation vessel according to one disclosed embodiment of the invention;
FIG. 4 is a schematic structural diagram of a horizontal separation vessel disclosed in the second embodiment of the present invention.
Detailed Description
the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
in the present invention, the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", "inner", "outer", "center", "vertical", "horizontal", "lateral", "longitudinal", and the like indicate an orientation or positional relationship based on the orientation or positional relationship shown in the drawings. These terms are used primarily to better describe the invention and its embodiments and are not intended to limit the indicated devices, elements or components to a particular orientation or to be constructed and operated in a particular orientation.
Moreover, some of the above terms may be used to indicate other meanings besides the orientation or positional relationship, for example, the term "on" may also be used to indicate some kind of attachment or connection relationship in some cases. The specific meanings of these terms in the present invention can be understood by those skilled in the art as appropriate.
furthermore, the terms "mounted," "disposed," "provided," "connected," and "connected" are to be construed broadly. For example, it may be a fixed connection, a removable connection, or a unitary construction; can be a mechanical connection, or an electrical connection; may be directly connected, or indirectly connected through intervening media, or may be in internal communication between two devices, elements or components. The specific meanings of the above terms in the present invention can be understood by those of ordinary skill in the art according to specific situations.
Furthermore, the terms "first," "second," and the like, are used primarily to distinguish one device, element, or component from another (the specific nature and configuration may be the same or different), and are not used to indicate or imply the relative importance or number of the indicated devices, elements, or components. "plurality" means two or more unless otherwise specified.
The embodiment of the invention discloses a horizontal separation container and a refrigeration system, which can solve the problem that liquid impact occurs due to the fact that refrigerant liquid drops are contained in steam entering a compressor due to the fact that the existing refrigeration system is poor in steam separation effect. The following detailed description is made with reference to the accompanying drawings.
example one
Fig. 1 to fig. 2 are schematic structural diagrams of a horizontal separation vessel according to an embodiment of the present invention. The horizontal separation container provided by the embodiment of the invention comprises a cylinder 10, wherein a central axis of the cylinder 10 is horizontally arranged, the cylinder 10 is provided with an air inlet 11 and an air return port 12 which are communicated with the inside of the cylinder 10, the central axis of the air return port 12 is perpendicular to the central axis of the cylinder 10, a projection of the central axis of the air return port 12 on a plane where the central axis of the cylinder 10 is located is a first projection point 121, a projection of the central axis of the air inlet 11 on the plane where the central axis of the cylinder 10 is located is a second projection point 111, a distance L between the first projection point 121 and the second projection point 111 is a separation length L of the cylinder 10, and the separation length L of the cylinder 10 is greater than or equal to an actual separation length L1 of liquid drops in a separation state in the cylinder 10; the actual separation length L1 is a distance between a projection point 21 of the droplet 20 on the plane of the central axis of the cylinder 10 when the droplet 20 in the separated state enters the cylinder 10 from the air inlet 11 and a contact point 22 of the droplet 20 contacting the plane of the central axis of the cylinder 10 when the droplet 20 travels to the plane of the central axis of the cylinder 10 at the separation speed.
Wherein the horizontal separation vessel can be used in, but is not limited to, refrigeration systems and the like. The refrigerant used in the refrigeration system may be, but is not limited to, ammonia, freon, carbon dioxide, and the like.
In the present embodiment, the horizontal separation vessel is used in a refrigeration system, the vapor entering the horizontal separation vessel from the gas inlet 11 contains a plurality of refrigerant droplets with different diameters, wherein a part of the refrigerant droplets has a larger diameter and a heavier weight, and the refrigerant droplets basically do not influence the horizontal acting force, but fall vertically into the plane of the central axis of the cylinder 10 under the action of the self gravity, that is, the part of the refrigerant droplets can be automatically separated from the gas under the action of the self gravity. A small portion of the refrigerant droplets having a very small diameter and a very light weight are introduced directly into the compressor from the return port 12 by a horizontal force of the compressor (not shown), i.e., the small refrigerant droplets cannot be separated into gas and liquid. The refrigerant droplets between the two diameters are the droplets 20 in the separated state in this embodiment, and they are inclined into the plane of the central axis of the cylinder 10 under the resultant force of the vertical force and the horizontal force, so as to separate the droplets from the gas.
Specifically, the diameter of the refrigerant droplets to be separated can be looked up by a refrigerant performance table, for example, the droplet diameter of ammonia here can be 0.003 m, the droplet diameter of freon here can be 0.002 m, and the droplet diameter of carbon dioxide here can be 0.001 m. Taking ammonia refrigerant as an example, the droplets 20 in the separated state refer to ammonia refrigerant droplets with a droplet diameter greater than 0.003 m, which can be separated after entering the cylinder 10 from the air inlet, and it should be understood that when a droplet with a droplet diameter equal to 0.003 m enters the cylinder 10, the distance between the projection point of the droplet on the plane where the central axis of the cylinder 10 is located and the contact point where the droplet is in contact with the plane where the central axis of the cylinder 10 after separation is the actual separation length L1, while a droplet with a droplet diameter less than 0.003 m is the above-mentioned droplet with a very small droplet diameter, which will directly enter the compressor from the return air port 12 under the horizontal force of the compressor.
The actual separation length L1 includes the distance between the projection point 21 of the liquid droplet 20 on the plane of the central axis of the cylinder 10 and the contact point 22 of the corresponding liquid droplet 20 contacting the plane of the central axis of the cylinder 10 when the liquid droplet 20 enters the cylinder 10 from the air inlet 11 in the separated state and the corresponding liquid droplet 20 travels to the plane of the central axis of the cylinder 10 at the separation speed. Specifically, taking ammonia refrigerant as an example, it is described above that the droplet diameter of ammonia here may be 0.003 m, in this case, the droplet 20 in the separated state is an ammonia refrigerant droplet with a droplet diameter of not less than 0.003 m, and the actual separation length L1 is the distance between the projection point of the droplet with a droplet diameter of 0.003 m on the plane of the central axis of the cylinder 10 when entering the cylinder 10 and the contact point of the droplet with the plane of the central axis of the cylinder 10 after separation. And the actual separation length of the ammonia refrigerant droplets with the droplet diameter larger than 0.003 m in the cylinder 10 is smaller than the actual separation length L1. That is, the actual separation length L1 includes the distance between the projection point of the ammonia refrigerant droplets with a droplet diameter of 0.003 m or more on the plane of the central axis of the cylinder 10 after entering the cylinder 10 and the contact point of the separated ammonia refrigerant droplets contacting the plane of the central axis of the cylinder 10. It should be understood that, in design, the distance L between the first projection point 121 and the second projection point 111 (i.e., the separation length L of the cylinder 10) should be greater than or equal to the actual separation length L1 of the ammonia refrigerant liquid drop with a liquid drop diameter of 0.003 m in the cylinder 10, so as to effectively ensure that all the liquid drops 20 in a separated state can enter the plane of the central axis of the cylinder 10, thereby ensuring that the vapor entering the compressor from the return port 12 contains substantially no liquid drops, and effectively ensuring the normal operation of the compressor.
In this embodiment, in order to ensure the normal operation of the refrigeration system, the cylinder 10 may be used to store refrigerant liquid, and the liquid level of the refrigerant liquid in the cylinder 10 needs to be controlled within a certain range, which cannot be higher than the central axis of the cylinder 10, nor lower than the lowest liquid level alarm line L2 disposed on the cylinder 10, so as to ensure the normal operation of the entire refrigeration system. The liquid level formed by the refrigerant liquid between the lowest liquid level alarm line L2 of the cylinder 10 and the central axis of the cylinder 10 is the operating liquid level S when the horizontal separation vessel operates, the plane where the central axis of the cylinder 10 is located is the highest operating liquid level, and the plane where the operating liquid level S is located is the lowest operating liquid level where the lowest liquid level alarm line L2 is located. Furthermore, it should be understood that the plane of the central axis of the cylinder 10 is the highest position (i.e. the highest operating liquid level) that the refrigerant liquid can reach in practical application, and if the separation length L of the cylinder 10 can be greater than or equal to the actual separation length L1 of the refrigerant liquid droplet 20 in the separated state in the cylinder 10, when the refrigerant liquid in the cylinder 10 is at the other operating liquid level S, the actual separation length L1 of the refrigerant liquid droplet 20 in the separated state in the cylinder 10 is always within the separation length L of the cylinder 10, so that, in design, the calculation can be performed according to the condition that the operating liquid level S is in the plane of the central axis of the cylinder 10.
wherein, the cylinder 10 can be a container formed by seamless connection of two elliptical seal heads and a cylindrical structure. The plane of the central axis of the cylinder 10 divides the cylinder 10 into an upper cavity 13 and a lower cavity 14, the refrigerant liquid is located in the lower cavity 14, that is, the operating liquid level S is formed in the lower cavity 14, the air inlet 11 and the air return port 12 are both located on the upper cavity 13, and the air inlet 11 and the air return port 12 may be disposed in the same plane or in different planes, that is, the air inlet 11 may be disposed at any position on the upper cavity 13.
In this embodiment, the horizontal separation vessel further includes at least one liquid outlet 30, and each liquid outlet 30 is disposed on the lower cavity 14 of the cylinder 10, and is used for pumping the refrigerant liquid in the lower cavity 14 out of the cylinder 10, so as to ensure that the operating liquid level S in the cylinder 10 can be always within a reasonable range, and further ensure that the refrigeration system has good cooling performance.
The number of the liquid outlets 30 can be set to one, two, three or four, and the liquid outlets 30 can be disposed at any position on the lower cavity 14 of the cylinder 10.
Further, in order to prevent the refrigerant liquid in the cylinder 10 from swirling when the refrigerant liquid is discharged, a vortex preventing plate 31 is disposed in each liquid outlet 30, and the vortex preventing plate 31 is used to divide the refrigerant liquid into multiple paths of liquids, so as to prevent the refrigerant liquid in the cylinder 10 from vertically entering a pipeline connected to the liquid outlets 30 to cause a swirling phenomenon. Specifically, the vortex preventing plate 31 includes a top plate 31a and a plurality of partition plates 31b disposed on a lower end surface of the top plate 31a, a preset included angle a is formed between two adjacent partition plates 31b, and the plurality of partition plates 31b are used for separating refrigerant liquid discharged from the liquid outlet 30 of the cylinder 10 into a plurality of paths of liquid to enter a pipeline connected with the liquid outlet 30, so as to prevent a vortex phenomenon.
preferably, the top plate 31a may be a circular thin plate, the number of the partition plates 31b may be three, four or more, and the preset included angle a between two adjacent partition plates 31b may be 90 ° or 120 °, etc.
in this embodiment, the refrigeration system may be an ammonia refrigeration system, that is, the refrigerant liquid used in the refrigeration system is ammonia liquid. In this case, the horizontal separation vessel may further include an oil collecting pipe 40, the oil collecting pipe 40 is disposed on the lower cavity 14 of the cylinder 10, and the oil collecting pipe 40 is spaced from the liquid outlet 30, the oil collecting pipe 40 is used for collecting oil under the ammonia refrigerant to ensure the normal operation of the ammonia refrigeration system.
In this embodiment, this air inlet 11 can be used to connect intake pipe 15, and this return-air inlet 12 can be used to connect outlet duct 16, and this intake pipe 15 all can be the straight tube with this outlet duct 16, and at this moment, the distance between the axis of this intake pipe 15 and the axis of this outlet duct 16 is the separation length L of this barrel promptly.
in this embodiment, the separation speed of the drum 10 is a vertical separation speed Utand horizontal separation velocity UhWherein the vertical separation speed
the horizontal separationSpeed of rotation
Wherein h is the distance from the air inlet 11 to the plane where the central axis of the cylinder 10 is located, and the unit is m;
L is the distance between the first projection point 111 and the second projection point 121, and is expressed in m;
f is a correction value;
CDIs a coefficient of resistance;
g is the acceleration of gravity;
ρvIn terms of boil-off gas density, it is expressed in kg/m3；
ρLIs the density of the refrigerant liquid, and has a unit of kg/m3；
d is the diameter of the refrigerant droplet, which is given in m.
Specifically, the specific derivation process of the separation speed of the cylinder 10 is as follows: according to the above, the gas entering the horizontal separation vessel from the gas inlet 11 is in a gas-liquid mixed state, and the gas contains refrigerant liquid with a plurality of different diameters. The refrigerant liquid with a smaller diameter is sucked away from the return air port 12 by the compressor along with the gas, and the refrigerant liquid with a larger diameter drops into the operating liquid surface S, so that the gas-liquid separation of the refrigerant is realized. Accordingly, we can assume a critical diameter (i.e. the diameter of the above-mentioned refrigerant liquid drop to be separated), when the diameter of the refrigerant liquid drop is smaller than the critical diameter, the refrigerant liquid drop can directly enter the compressor through the air return port 12 of the horizontal separation container under the action of the compressor; when the diameter of the refrigerant droplets is greater than or equal to the critical diameter, the refrigerant droplets fall to the operating liquid surface S under the action of gravity, and the operating liquid surface S is set to be the plane of the central axis of the cylinder 10. Accordingly, in the embodiment of the present invention, the refrigerant droplet having the droplet diameter equal to the critical diameter is referred to as a critical droplet. When the horizontal separation container reaches the maximum separation capacity under a certain working condition (the refrigerant liquid drops with the critical diameter or more all fall into the operating liquid levelS) is moved to the highest operating liquid level (i.e., the plane of the central axis of the cylinder 10) in the vertical direction, and is also moved to the intersection point of the central line of the return air port 12 and the operating liquid level in the horizontal direction, and the moving speed U of the critical liquid drop in the horizontal direction is at this timehThe gas-liquid separation speed of the horizontal separation container under the working condition can be considered. It can be seen that the vertical separation velocity U is the critical drop moving in the vertical directiontWith horizontal separation speed U when moving in the horizontal directionhThe relationship of (a) to (b) is as follows:
Namely:
In the formula (4), h or L can be obtained by measurement or table lookup, and it can be known that the horizontal separation velocity U of the refrigerant droplets is calculated if necessaryhThe vertical separation velocity U of the refrigerant droplets can be calculated firstt。
The vertical separation velocity U of the refrigerant droplets is described in detail belowtThe corresponding derivation process:
when the critical liquid drop is in a critical state of gas-liquid separation, the critical liquid drop is in a suspension state in the vertical direction, at the moment, the resultant force formed by the gravity, the buoyancy and the resistance applied to the critical liquid drop is zero, the critical liquid drop does not move in an accelerating manner in the vertical direction, and the speed of the state is called as the maximum speed Vt：
Wherein g is gravitational acceleration, d is the diameter of refrigerant droplet, CDis a coefficient of resistance; rhovFor evaporating gas density, pLIs the refrigerant liquid density.
In horizontal separation vessels, the critical droplets are also subjected to a horizontal directionThe effect of the drag force, thus requiring a V-pairtMaking a correction to obtain UtAnd this modification is closely related to the structure of the interior of the horizontal separation vessel.
Referring to fig. 1, it can be seen from fig. 1 that the motion trajectory of the critical liquid droplet (the liquid droplet 20 in the separation state) in the horizontal separation container can be regarded as a connection line between the center of the gas inlet 11 and a contact point 22 of the liquid droplet 20, which is in contact with the plane of the central axis of the cylinder 10 when entering the plane of the central axis of the cylinder 10 at the separation speed, and the connection line and the plane of the central axis of the cylinder 10 form a separation angle θ,(i.e., the ratio of the separation height to the separation length). And the smaller tan theta, the horizontal separation speed U required when the critical liquid droplet is separatedhThe greater, simultaneous vertical separation velocity UtThe smaller the value of (c). That is, the long separation length is advantageous for increasing the gas-liquid separation rate of the refrigerant, and also for reducing the drop rate of the liquid droplets. When U is turnedhwhen equal to 0, Ut＝Vt(ii) a With increasing compressor suction, Uhis not zero and UhThe larger, Utthe smaller. Thus, VtAnd UtThe relationship between them is:
Ut＝(tanθ×f)×Vt (6)
The vertical separation velocity U can be obtained by substituting tan theta and the formula (5) into the formula (6)tThe calculation formula of (2):
Wherein f is a correction factor. By the above-mentioned pair of vertical separation speeds UtIt can be seen from the derivation analysis of the calculation formula (2) that when the gas inlet 11 and the gas return 12 of the horizontal separation vessel are not on the same plane, the correction needs to be performed by the correction factor f. Referring to fig. 3, fig. 3 is a side view of a horizontal separation vessel according to an embodiment of the present invention. In the horizontal separation vessel shown in FIG. 3, the gas inlet and the gas return are not in the same positionOn the plane: the air inlet is positioned on a vertical line of a circle center (specifically, the center line of the air inlet is positioned on the vertical line of the circle center), and the air return port (specifically, the center line of the air return port) is positioned on a horizontal line of a crossing point of a lead wire and an arc, wherein the horizontal line of the circle center forms an angle of 45 degrees. Therefore, if the air inlet and the air return port of the horizontal separation container are both positioned on the vertical line of the circle center of the horizontal separation container model machine, the value of the correction factor is a first preset value; and if the air inlet and/or the air return port of the horizontal separation container model are/is not positioned on the vertical line of the circle center of the horizontal separation container model, the correction factor is obtained according to the container diameter of the horizontal separation container. In addition, the value of the correction factor obtained from the vessel diameter of the horizontal separation vessel is different from the first preset value.
In summary, by combining the formulas (3) and (7), the horizontal separation velocity U can be obtainedhThe calculation formula of (2):
Further, as is clear from the above analysis of the relationship between the separation angle θ and the gas-liquid separation speed, in designing a horizontal separation vessel, a longer separation length, that is, a smaller separation angle θ can be set after the diameter of the vessel is determined. Preferably, θ may be set to be smaller than a first value that enables the separation height to be greater than or equal to the separation length when θ is greater than or equal to the first value, which is detrimental to the separation of the droplets. Further, considering the re-entrainment velocity issue, the separation angle θ should be greater than an angle threshold, and the angle threshold is less than the first value described above.
According to the horizontal separation container provided by the embodiment of the invention, the distance between the projection point of the central axis of the air return port on the plane of the central axis of the cylinder body and the projection point of the central axis of the air inlet on the plane of the central axis of the cylinder body is larger than or equal to the actual separation length of liquid drops in a separation state in the cylinder body, so that the steam entering the horizontal separation container from the air inlet can be effectively ensured to be subjected to sufficient gas-liquid separation, the steam is further effectively ensured to contain no or no refrigerant liquid drops when flowing through the air return port, and the phenomenon of liquid impact caused by the refrigerant liquid drops entering a compressor is effectively prevented.
Example two
fig. 4 is a schematic structural diagram of a horizontal separation vessel according to a second embodiment of the present invention. The horizontal separation container provided by the second embodiment of the invention is different from the horizontal separation container provided by the first embodiment of the invention in that:
The cylinder 10 is provided with two air inlets 11 communicated with the inside of the cylinder 10 and a return air port 12 arranged between the two air inlets 11, the two air inlets 11 are symmetrically arranged relative to the central axis of the return air port 12, the distance between the two air inlets 11 is the separation length L of the cylinder 10, and the separation length L is greater than or equal to the actual separation length of the liquid drops in the separation state in the cylinder 10; when two liquid drops in a separated state enter the cylinder 10 from the air inlet 11, respectively, a distance between a projection point of one liquid drop on a plane where the central axis of the cylinder 10 is located and a contact point, which is in contact with the plane where the central axis of the cylinder 10 is located, when the one liquid drop enters the plane where the central axis of the cylinder 10 at a separation speed, is a first distance, and a distance between a projection point of the other liquid drop on the plane where the central axis of the cylinder 10 is located and a contact point, which is in contact with the plane where the central axis of the cylinder 10 is located, when the other liquid drop enters the plane where the central axis of the cylinder 10 at the separation speed, is a second distance, and at this time, the actual separation length is the sum of the first distance and the second distance.
The description of the relationship between the liquid drop in the separation state and the operation liquid level and the description of the relationship between the plane of the central axis of the cylinder 10 and the operation liquid level are the same as those described in the first embodiment of the present invention, and are not repeated herein. In addition, the design of the liquid outlet 30 and the oil collecting pipe 40 is the same as that of the first embodiment, and the detailed description thereof is omitted.
In the present embodiment, the two air inlets 11 are respectively used for connecting the first air inlet pipe 50 and the second air inlet pipe 60, and both the first air inlet pipe 50 and the second air inlet pipe 60 can be straight pipes or bent pipes. When the first air inlet pipe 50 and the second air inlet pipe 60 are both straight pipes, the distance between the central axis of the first air inlet pipe 50 and the central axis of the second air inlet pipe 60 is the separation length L of the cylinder 10. When the first air inlet pipe 50 and the second air inlet pipe 60 are both bent pipes, one end of the first air inlet pipe 50 extending into the cylinder 10 has a first air outlet 511, one end of the second air inlet pipe 60 extending into the cylinder 10 has a second air outlet 611, and a distance L between the first air outlet 511 and the second air outlet 611 is a separation length L of the cylinder 10 (as shown in fig. 4). Thereby effectively ensuring that the steam entering the horizontal separation container can be fully separated into gas and liquid and ensuring the effective operation of a refrigeration system.
Further, the first air inlet duct 50 includes a first horizontal portion 51 and a first vertical portion 52 fixedly connected to the first horizontal portion 51, the second air inlet duct 60 includes a second horizontal portion 61 and a second vertical portion 62 fixedly connected to the second horizontal portion 61, the first vertical portion 52 and the second vertical portion 62 are both located outside the barrel 10, the first horizontal portion 51 and the second horizontal portion 61 are both located inside the barrel 10, the first horizontal portion 51 has the first air outlet 511, the second horizontal portion 61 has the second air outlet 611, and an outlet direction of the first air outlet 511 and an outlet direction of the second air outlet 611 are arranged in a reverse direction. By adopting the arrangement mode, the retention time of the steam in the cylinder 10 can be further prolonged, effective separation of gas and liquid in the cylinder 10 is realized, the steam entering the compressor from the return air port 12 does not contain refrigerant liquid drops basically, and the condition that the compressor is damaged due to the fact that the refrigerant liquid drops enter the compressor is effectively avoided.
In this embodiment, the vertical separation speed of the drum 10
The horizontal separation velocity
Wherein h is the distance from any one of the air inlets 11 to the plane where the central axis of the cylinder 10 is located, and the unit is m;
l is the distance between the two air inlets 11, which is given in m;
f is a correction value;
CDIs a coefficient of resistance;
g is the acceleration of gravity;
ρvIn terms of boil-off gas density, it is expressed in kg/m3；
ρLIs the density of the refrigerant liquid, and has a unit of kg/m3；
d is the diameter of the refrigerant droplet, which is given in m.
Specifically, in the present embodiment, the vertical separation speed U of the drum 10tspeed of separation from horizontal Uhthe derivation process is the same as that in the first embodiment, and is not described here again.
according to the horizontal separation container provided by the embodiment of the invention, the distance between the two air inlets is larger than or equal to the actual separation length of liquid drops in a separation state in the cylinder, so that the steam entering the cylinder is effectively ensured to have enough residence time, the steam can be subjected to sufficient gas-liquid separation in the cylinder, the steam entering the compressor is effectively ensured to contain no refrigerant liquid drops, and the liquid impact phenomenon is effectively prevented.
EXAMPLE III
Referring to fig. 1 and 4 together, a refrigeration system according to a third embodiment of the present invention includes the horizontal separation container according to the first embodiment or the horizontal separation container according to the second embodiment.
specifically, the horizontal separation container disclosed in the first embodiment may be disposed between an evaporator (not shown) and a compressor (not shown), in which case, vapor in the evaporator can enter the horizontal separation container through only one air inlet 11, and after gas-liquid separation is performed in the horizontal separation container, the vapor enters the compressor through the air return port 12, so that refrigerant liquid carried in the vapor is effectively prevented from entering the compressor.
alternatively, the refrigeration system may be a horizontal separation vessel as disclosed in the second embodiment, wherein two inlets of the horizontal separation vessel are simultaneously connected to the evaporator pipe, so that the steam in the evaporator can simultaneously enter the horizontal separation vessel through the two inlets 11. Optionally, a first air inlet pipe 50 and a second air inlet pipe 60 are respectively arranged in the two air inlets 11, the first air inlet pipe 50 and the second air inlet pipe 60 are both bent pipes, and meanwhile, horizontal portions of the first air inlet pipe 50 and the second air inlet pipe 60 both extend into the barrel 10, and gas outlets of the two horizontal portions are arranged in opposite directions, so that steam can stay in the horizontal separation container for a longer time, and further, gas and liquid in the steam can be separated more effectively.
in the refrigeration system provided by the third embodiment, the horizontal separation container is arranged between the evaporator and the compressor, and the positions of the air inlet and the air return port of the horizontal separation container are reasonably designed, that is, the distance between the projection point of the central axis of the air return port of the horizontal separation container on the plane of the central axis of the cylinder and the projection point of the central axis of the air inlet on the plane of the central axis of the cylinder is greater than or equal to the actual separation length of the cylinder, or the distance between the two air inlets is greater than or equal to the actual separation length of the cylinder, so that the refrigerant liquid drops in the steam entering the separation container from the air inlets are effectively separated from the gas, further the steam flowing into the compressor from the air return port is effectively ensured to contain or basically contain no refrigerant liquid drops, the liquid impact phenomenon is effectively prevented, and the normal operation of the compressor is ensured, and economic loss is reduced.
The horizontal separation vessel and the refrigeration system disclosed in the embodiments of the present invention are described in detail above, and the principle and the embodiment of the present invention are explained in detail herein by using specific examples, and the description of the above embodiments is only used to help understand the core ideas of the horizontal separation vessel and the refrigeration system of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (10)
1. A horizontal separation vessel is characterized by comprising
The liquid drop separation device comprises a barrel, wherein the central axis of the barrel is horizontally arranged, the barrel is provided with an air inlet and an air return port which are communicated with the interior of the barrel, the central axis of the air return port is perpendicular to the central axis of the barrel, the projection of the central axis of the air return port on the plane of the central axis of the barrel is a first projection point, the projection of the central axis of the air inlet on the plane of the central axis of the barrel is a second projection point, the distance between the first projection point and the second projection point is the separation length of the barrel, and the separation length of the barrel is greater than or equal to the actual separation length of liquid drops in a separation state in the barrel;
when the liquid drops in the separation state enter the cylinder from the air inlet, the actual separation length is the distance between a projection point of the liquid drops on the plane where the central axis of the cylinder is located and a contact point of the liquid drops, which is contacted with the plane where the central axis of the cylinder is located, when the liquid drops move to the plane where the central axis of the cylinder is located at the separation speed.
2. the horizontal separation vessel of claim 1 wherein the separation velocity is a vertical separation velocity Utand horizontal separation velocity UhThe rate of closure of (a), wherein,
The vertical separation speed
The horizontal separation speed
H is the distance from the air inlet to the plane where the central axis of the cylinder body is located, and the unit of h is m;
L is the distance between the first projection point and the second projection point, and the unit of L is m;
f is a correction value;
CDis a coefficient of resistance;
g is the acceleration of gravity;
ρvIn terms of boil-off gas density, it is expressed in kg/m3；
ρLIs the density of the refrigerant liquid, and has a unit of kg/m3；
d is the diameter of the refrigerant droplet, which is given in m.
3. the horizontal separation vessel according to claim 1, further comprising at least one liquid outlet, wherein each liquid outlet is disposed on a side of the cylinder away from the return air port, and a vortex breaker is disposed in each liquid outlet.
4. the horizontal separation vessel according to claim 3, wherein the vortex preventing plate comprises a top plate and a plurality of separation plates arranged on the lower end surface of the top plate, and a preset included angle is formed between two adjacent separation plates.
5. The horizontal separation vessel according to claim 3 further comprising an oil collection pipe disposed on a side of the cylinder away from the air return port, the oil collection pipe being spaced from the liquid outlet.
6. a horizontal separation vessel, characterized in that it comprises,
The liquid drop separation device comprises a barrel, wherein the central axis of the barrel is horizontally arranged, the barrel is provided with two air inlets communicated with the interior of the barrel and an air return port arranged between the two air inlets, the two air inlets are symmetrically arranged relative to the central axis of the air return port, the distance between the two air inlets is the separation length of the barrel, and the separation length is greater than or equal to the actual separation length of liquid drops in a separation state in the barrel;
When two liquid drops in a separated state enter the cylinder body from the two air inlets respectively, the distance between a projection point of one liquid drop on the plane where the central axis of the cylinder body is located and a contact point, which is in contact with the plane where the central axis of the cylinder body is located, when one liquid drop runs to the plane where the central axis of the cylinder body at a separation speed, is a first distance, the distance between a projection point of the other liquid drop on the plane where the central axis of the cylinder body is located and a contact point, which is in contact with the plane where the central axis of the cylinder body is located, when the other liquid drop runs to the plane where the central axis of the cylinder body at the separation speed, is a second distance, and the actual separation length is the sum of the first distance and the second distance.
7. The horizontal separation vessel according to claim 6 wherein the two gas inlets are respectively connected to a first gas inlet pipe and a second gas inlet pipe, and the first gas inlet pipe and the second gas inlet pipe are both straight pipes or bent pipes;
When the first air inlet pipe and the second air inlet pipe are both straight pipes, the distance between the central axis of the first air inlet pipe and the central axis of the second air inlet pipe is the separation length of the cylinder;
when first intake pipe and second intake pipe are the return bend, first intake pipe stretches into the inside one end of barrel has first gas outlet, the second intake pipe stretches into the inside one end of barrel has the second gas outlet, first gas outlet extremely the distance of second gas outlet does the separation length of barrel.
8. The horizontal separation vessel according to claim 7, wherein the first inlet duct and the second inlet duct are both bent tubes, the first inlet duct includes a first horizontal portion and a first vertical portion fixedly connected to the first horizontal portion, the second inlet duct includes a second horizontal portion and a second vertical portion fixedly connected to the second horizontal portion, the first vertical portion and the second vertical portion are both located outside the vessel body, the first horizontal portion and the second horizontal portion are both located inside the vessel body, the first horizontal portion has the first air outlet, the second horizontal portion has the second air outlet, and an outlet direction of the first air outlet is opposite to an outlet direction of the second air outlet.
9. the horizontal separation vessel according to any one of claims 6 to 8 wherein the separation velocity is a vertical separation velocity Utand horizontal separation velocity Uhthe rate of closure of (a), wherein,
the vertical separation speed
the horizontal separation speed
H is the distance from any air inlet to the plane where the central axis of the cylinder body is located, and the unit of h is m;
l is the distance between two of the air inlets, and the unit of L is m;
f is a correction value;
CDIs a coefficient of resistance;
g is the acceleration of gravity;
ρvIn terms of boil-off gas density, it is expressed in kg/m3；
ρLIs the density of the refrigerant liquid, and has a unit of kg/m3；
d is the diameter of the refrigerant droplet, which is given in m.
10. A refrigeration system comprising a horizontal separation vessel according to any one of claims 1 to 5 or a horizontal separation vessel according to any one of claims 6 to 9.
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| CN201810590297.XA CN110579048A (en) | 2018-06-08 | 2018-06-08 | Horizontal separation container and refrigerating system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810590297.XA CN110579048A (en) | 2018-06-08 | 2018-06-08 | Horizontal separation container and refrigerating system |
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