CN113916598A - Device for sampling and gasifying liquid phase medium - Google Patents
Device for sampling and gasifying liquid phase medium Download PDFInfo
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- CN113916598A CN113916598A CN202011196194.9A CN202011196194A CN113916598A CN 113916598 A CN113916598 A CN 113916598A CN 202011196194 A CN202011196194 A CN 202011196194A CN 113916598 A CN113916598 A CN 113916598A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/02—Devices for withdrawing samples
- G01N1/10—Devices for withdrawing samples in the liquid or fluent state
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
Abstract
The invention discloses a device for sampling and gasifying a liquid phase medium, which comprises: the sampling unit comprises a sampling probe and is used for collecting the liquid phase medium; the first gasification unit is used for gasifying the liquid-phase medium collected by the sampling unit; and the throttling unit is arranged on a first pipeline for connecting the sampling unit and the first gasification unit, and is configured to adjust the flow of the liquid-phase medium entering the first gasification unit and enable the liquid-phase medium entering the first gasification unit to have a sufficient supercooling degree based on decompression and gasification. The throttling unit is arranged, so that on one hand, the flow of the liquid-phase medium entering the first gasification unit is adjusted to adapt to the change of the heat load of the first gasification unit; on the other hand, a small part of the liquid phase medium is decompressed and gasified before entering the first gasification unit, the gasified liquid phase medium absorbs heat, the supercooling degree of the residual liquid phase medium is increased, and fractionation of the liquid phase medium before entering the first gasification unit for gasification is effectively avoided.
Description
The present invention claims priority from patent application having application number CN202010652011.3, filed on year 2020, month 07, 08, the contents of which are incorporated herein by reference.
Technical Field
The invention relates to the technical field of liquid sampling and gasification, in particular to a device for sampling and gasifying a low-temperature liquid-phase medium.
Background
When a medium which is in a liquid phase at a low temperature, such as LNG, LPG and other low-temperature liquid phase media, is sampled and analyzed, the medium needs to be converted into a gas phase so as to be analyzed. Because the low-temperature liquid phase medium often contains a plurality of components with different boiling points, when the low-temperature liquid phase medium is heated or gasified under reduced pressure, the components with different boiling points are converted into gas phases in sequence in a time-sharing or low-to-high sequence, so that a fractionation phenomenon occurs, and the analysis and measurement results are deviated.
In order to ensure the accuracy of the analysis result, the low-temperature liquid phase medium must be kept in a supercooled state before gasification, any component must not be fractionated and gasified, and the gas component mixing ratio and the liquid component ratio are completely consistent after gasification. In the prior art, in order to avoid measurement deviation caused by gasification in distillation range, a homogenization container with the volume of more than 20L is often adopted, so that the real-time property of analysis components is poor.
The vaporizer is one of key components for converting a liquid-phase medium into a gas phase, the vaporizer in the prior art controls the pressure of fluid by using the change of the cross-sectional area to enable the fluid to reach a supercritical state, the thermal inertia of a heating body is not considered, the working state of hermetically heating the liquid-phase sample to the release of the critical state is difficult to realize, and the vaporizer is difficult to be applied to actual operation.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide an apparatus for sampling and vaporizing a liquid medium, which is intended to realize stable conversion of a liquid medium containing components with different boiling points into a gas sample, thereby improving the accuracy of the component analysis of the liquid medium.
As a first aspect of the present invention, the present invention provides an apparatus for sampling and vaporizing a liquid-phase medium.
Preferably, the device for sampling and gasifying a liquid phase medium comprises:
the sampling unit comprises a sampling probe and is used for collecting the liquid phase medium;
the first gasification unit is used for gasifying the liquid-phase medium collected by the sampling unit; and
the throttling unit is arranged on a first pipeline for connecting the sampling unit and the first gasification unit, and is configured to adjust the flow of the liquid-phase medium entering the first gasification unit and enable the liquid-phase medium entering the first gasification unit to have a sufficient supercooling degree based on decompression and gasification.
Preferably, the throttling unit comprises a throttling element and a liquid dividing pipeline, and the throttling element is arranged on the liquid dividing pipeline;
the throttling element comprises a shell, a liquid inlet and a liquid outlet are arranged at two opposite ends of the shell, a throttling channel is arranged in the shell, and the liquid inlet, the liquid outlet and the throttling channel are communicated with each other; the cross-sectional area of the throttling channel is gradually reduced and then gradually increased from the liquid inlet to the liquid outlet;
the liquid medium part collected by the sampling unit enters the first gasification unit through the first pipeline, and the other part of the liquid medium collected by the sampling unit enters the throttling element through a liquid distribution pipeline communicated with the first pipeline, and is subjected to pressure reduction gasification to generate a gas-liquid mixed phase which is discharged from the liquid outlet.
Preferably, the first gasification unit comprises a first heat exchange element;
the first heat exchange element comprises a columnar heat conduction body, a liquid flow channel extending along the length direction of the columnar heat conduction body is arranged in the columnar heat conduction body, one end of the liquid channel is provided with an opening to form a liquid inlet, and the other end of the liquid channel is closed; wherein, a plurality of through holes communicated with the liquid flow channel are arranged on the columnar heat conduction body surrounding the liquid flow channel, and the outlet of each through hole is connected with a guide pipe; and liquid-phase medium from the sampling unit enters the liquid flow channel through the liquid inlet, and gas generated by heating and gasification is discharged through the through hole and the guide pipe and is converged at the outlet end of the guide pipe.
Preferably, a nozzle is arranged between the outlet end of the first pipeline and the liquid inlet, the liquid-phase medium enters the liquid flow channel through the nozzle, and the outlet of the nozzle is in a necking structure; the inlet end of the liquid separation pipeline is connected to the wall of the first pipeline close to the outlet end of the first pipeline.
Preferably, the sampling device further comprises a closed vacuum heat insulation shell, the sampling unit and the throttling unit are integrated in the vacuum heat insulation shell, and the inlet end of the sampling probe is exposed out of the vacuum heat insulation shell.
Preferably, a first valve for controlling the on-off of the sampling unit is arranged on the first pipeline, and the free end of a valve rod of the first valve is exposed outside the vacuum heat insulation shell; preferably, the first valve is a low temperature resistant shut-off valve.
Preferably, the system further comprises a discharge unit communicated with the throttling unit, and the discharge unit is used for gasifying a gas-liquid mixed phase generated by decompression and gasification of the throttling unit and then conveying the gasified gas-liquid mixed phase to a gas recovery main pipe;
the discharge unit comprises a second pipeline which is connected with the outlet end of the liquid separation pipeline and the gas recovery header pipe, and a second gasification unit for gasifying the gas-liquid mixed phase is arranged on the second pipeline; wherein the outlet end of the liquid separation pipeline is close to the sampling unit.
Preferably, the discharge unit further comprises a pressure transmitter and a second valve disposed between the second gasification unit and the gas recovery manifold; the second valve is a back pressure valve.
Preferably, an electric tracing band is arranged on the second pipeline.
Preferably, the first heat exchange element, the first pipeline close to the nozzle, and the second pipeline between the throttling unit and the second gasification unit are both provided with temperature measuring elements.
The invention has the beneficial effects that:
1) the device of the invention is provided with the throttling unit, on one hand, the liquid-phase medium flowing through the throttling unit is throttled, so that the flow of the liquid-phase medium entering the first gasification unit is adjusted to adapt to the change of the heat load of the first gasification unit; on the other hand, a small part of the liquid phase medium is decompressed and gasified before entering the first gasification unit, the gasified liquid phase medium absorbs heat, the supercooling degree of the residual liquid phase medium is increased, and fractionation of the liquid phase medium before entering the first gasification unit for gasification is effectively avoided;
2) the first gasification unit adopts the honeycomb first heat exchange element, has high energy density and larger heat exchange area, is fully and quickly gasified, can simultaneously and instantly gasify various components with different boiling points in a liquid phase medium with wide component distillation range, can furthest reduce the time of a fractionation state, keeps the consistency of a gas component and a liquid phase component, is beneficial to improving the accuracy of component analysis of the liquid phase medium, saves a large-size homogenizing container, and improves the analysis real-time property;
3) the sampling unit and the throttling unit are arranged in the closed vacuum heat insulation shell formed by heat insulation materials, so that the sampling unit and the throttling unit can effectively carry out cold insulation and heat insulation on a liquid medium, and can also carry out heat insulation on the sampling unit, the throttling unit and the first gasification unit, thereby preventing cold and hot convection, effectively inhibiting low-boiling-point components in a liquid medium from being gasified in advance, ensuring that a representative sample is obtained, and improving the accuracy of component analysis of the liquid medium.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments made with reference to the following drawings:
FIG. 1 is a schematic structural view of an apparatus for sampling and vaporizing a liquid-phase medium according to a preferred embodiment of the present invention;
FIG. 2 is an enlarged view of a portion A of the apparatus shown in FIG. 1.
Reference numerals: the device comprises a sampling unit 1, a sampling probe 10, an inlet end 101, a first gasification unit 2, a first heat exchange element 20, a columnar heat conduction body 201, a liquid inlet 202, a through hole 203, a guide pipe 204, an outlet end 205, a hollow shell 21, an air outlet 210, a throttling unit 3, a throttling element 30, a liquid distribution pipeline 31, an inlet end 311, an outlet end 312, a first pipeline 4, an outlet end 41, a nozzle 42, a vacuum heat insulation shell 5, a first valve 6, a valve rod 60, a discharge unit 7, a second pipeline 70, a second gasification unit 71, a pressure transmitter 72, a second valve 73, an electric tracing band 74, a gas recovery header pipe 8, a temperature measurement element 9, a sampling pipeline 100, a short neck 200, a flange 300 and a heat insulation structure 400.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the relevant invention and not restrictive of the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
It should be noted that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in an orientation or positional relationship indicated in the drawings for convenience and simplicity of description only, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention.
It should be noted that the terms "first", "second", etc. in the description of the present invention are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.
It should be noted that unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly and include, for example, fixed or removable connections or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Referring to fig. 1, there is shown an apparatus for sampling and vaporizing a liquid-phase medium according to a preferred embodiment of the present invention, which includes a sampling unit 1, a first vaporizing unit 2, and a throttling unit 3. Wherein, the sampling unit 1 comprises a sampling probe 10 for collecting the liquid phase medium; the first gasification unit 2 is used for gasifying the liquid-phase medium collected by the sampling unit 1; the throttling unit 3 is arranged on a first pipeline 4 for connecting the sampling unit 1 and the first gasification unit 2, and is configured to adjust the flow rate of the liquid-phase medium entering the first gasification unit 2 and enable the liquid-phase medium entering the first gasification unit 2 to have a sufficient supercooling degree based on decompression and gasification.
In the present embodiment, the sampling probe 10 of the sampling unit 1 is generally fixed in the main liquid medium loading/unloading line, and the liquid medium at the sampling point is in a supercooled state and the flow rate and pressure are stable.
In the present embodiment, the throttling unit 3 adjusts the flow rate of the liquid-phase medium entering the first gasification unit 2 through throttling action, so that a part of the liquid-phase medium enters the throttling unit 3, but does not enter the first gasification unit 2, and the part is subjected to reduced-pressure gasification, and the part of the liquid-phase medium absorbs heat of the remaining most of the liquid-phase medium in the reduced-pressure gasification process, thereby performing supercooling protection on the most of the liquid-phase medium entering the first gasification unit 2, improving the supercooling degree of the most of the liquid-phase medium entering the first gasification unit 2, keeping the most of the liquid-phase medium in a liquid state all the time, and preventing low-boiling-point components therein from being gasified in advance.
In the present embodiment, the first gasification unit 2 provides a heat medium environment to achieve rapid total gasification of the liquid phase medium.
The liquid medium includes, but is not limited to, any one or more of Liquefied Natural Gas (LNG), Liquefied petroleum gas, Liquefied gas, liquid nitrogen, and liquid argon.
Further, in some preferred embodiments of the present invention, the throttling unit 3 includes a throttling element 30 and a liquid dividing line 31, the throttling element 30 is disposed on the liquid dividing line 31;
the throttling element 30 comprises a shell, a liquid inlet and a liquid outlet are arranged at two opposite ends of the shell, a throttling channel is arranged in the shell, and the liquid inlet, the liquid outlet and the throttling channel are communicated with each other; the cross-sectional area of the throttling channel is gradually reduced and then gradually increased from the liquid inlet to the liquid outlet;
wherein, a part of the liquid-phase medium collected by the sampling unit 1 enters the first gasification unit 2 via the first pipeline 4, and another part of the liquid-phase medium collected by the sampling unit 1 enters the throttling element 30 via a liquid-separating pipeline 31 communicated with the first pipeline 1, and is decompressed and gasified to generate a gas-liquid mixed phase which is discharged from a liquid outlet of the throttling element 30.
Specifically, the throttling channel is sequentially provided with a liquid inlet area, a throttling area and a liquid outlet area in the fluid flow direction, the liquid inlet is used for guiding fluid to enter the liquid inlet area, and the liquid outlet is used for guiding the fluid which enters the liquid outlet area after throttling to flow out; the cross-sectional area of the liquid inlet area is gradually reduced from the liquid inlet to the throttling area, and the cross-sectional area of the liquid outlet area is gradually increased from the throttling area to the liquid outlet, so that the cross-sectional area of the throttling channel is gradually reduced and then gradually increased from the liquid inlet to the liquid outlet;
the liquid separation pipeline 31 includes an inlet end 311 and an outlet end 312, the inlet end 311 is communicated with the first pipeline 4, the liquid-phase medium enters the throttling element 30 from the liquid inlet of the throttling element 30 through the inlet end 311 of the liquid separation pipeline 31, the liquid-phase medium generates a conjugation effect in the throttling channel gradually contracted by the throttling element 30, so that the liquid-phase medium converts potential energy into kinetic energy under the throttling action, namely, the original pressure is converted into velocity, the pressure of the sample is reduced and tends to saturated vapor pressure, energy conversion occurs, a part of the liquid-phase medium is converted from a liquid state to a gaseous state to form a gas-liquid mixed phase, and the formed gas-liquid mixed phase is discharged from the liquid outlet of the throttling element 30 and then discharged from the outlet end 312 of the liquid separation pipeline 31.
The flow of the liquid-phase medium entering the first gasification unit 2 is adjusted and controlled by the throttling unit 3, so that the part of the liquid-phase medium entering the first gasification unit 2 can be matched with the gasification capacity of the first gasification unit 2 and is completely gasified in the first gasification unit 2, and most of the liquid-phase medium before entering the first gasification unit 2 is kept in a liquid state through the reduced-pressure flash vaporization of the throttling unit 3, and all components contained in the part of the liquid-phase medium can be simultaneously gasified after entering the first gasification unit 2, so that the authenticity and accuracy of an analysis result are ensured.
Further, in some preferred embodiments of the present invention, as shown in fig. 1, the first gasification unit 2 includes a first heat exchange element 20, the first heat exchange element 20 includes a cylindrical heat conduction body 201, a liquid flow channel extending along a length direction of the cylindrical heat conduction body 201 is disposed in the cylindrical heat conduction body 201, one end of the liquid flow channel has an opening to form a liquid inlet 202, and the other end of the liquid flow channel is closed; wherein, a plurality of through holes 203 communicated with the liquid flow channel are arranged on the columnar heat conduction body 201 surrounding the liquid flow channel, and the outlet of each through hole 203 is connected with a guide pipe 204; the liquid phase medium from the sampling unit 1 enters the liquid flow channel through the liquid inlet 202, and the gas generated by thermal vaporization is discharged through the through hole 203 and the guide pipe 204 and is merged at the outlet end 205 of the guide pipe 204.
Specifically, the first gasification unit 2 includes a hollow housing 21, and the first heat exchange element 20 is disposed in the hollow housing 21, wherein, for the convenience of understanding the structure of the first heat exchange element 20, fig. 1 only shows that the outlet of a part of the through holes 203 is connected to the guide pipe 204; after the liquid phase medium enters the columnar heat conduction body 201, at least part of the liquid phase medium is heated and gasified to generate gas, at the moment, the gas or gas-liquid mixed phase enters the through hole 203, continues to be heated and is completely gasified in the through hole 203 and the guide pipe 204, the gas is discharged from the outlet end 205 of the guide pipe 204 and is converged, and then the gas is discharged from the gas outlet 210 arranged on the hollow shell 21 close to the outlet end 205 and enters the analysis unit; therefore, optionally, the apparatus for sampling and vaporizing a liquid-phase medium of the present invention may further comprise an analyzing unit (not shown in the drawings) for on-line analyzing the composition of the vaporized liquid-phase medium, the analyzing unit being connected to the gas outlet 210 of the first vaporizing unit 2 by a pipe, the analyzing unit comprising an on-line chromatograph;
the columnar heat conducting body 201 and the guiding pipe 204 are made of high heat conducting material, such as copper, iron, or other simple substance or alloy; wherein, the first heat exchange element can adopt electromagnetic induction heating;
by adopting the honeycomb-type first heat exchange element 20, the gasification power and efficiency are obviously improved due to the high energy density and the large surface area; wherein, can set up temperature element on first heat exchange element 20, can real-time detection first gasification unit 2's temperature through temperature element, and then according to the heating temperature of temperature regulation and control first heat exchange element 20, through the temperature control with first gasification unit 2 more than the critical condensation temperature of liquid phase medium, thereby realize that the liquid phase turns into the gaseous phase rapidly, ensure that the liquid phase medium that gets into wherein obtains whole gasification in the short time, the coexistence state of gas, liquid can not appear, effectively avoided the gasification insufficient and reduced the representative defect of sample.
Further, in some preferred embodiments of the present invention, as shown in fig. 1 and fig. 2, the first pipeline 4 has an inlet end and an outlet end 41, the inlet end of the first pipeline is connected to the sampling probe 10, a nozzle 42 is disposed between the outlet end 41 of the first pipeline 4 and the liquid inlet 202, the liquid-phase medium enters the liquid flow passage of the first heat exchange element 20 through the nozzle 42, and the outlet of the nozzle 42 is in a reduced structure; wherein, the inlet end 211 of the liquid separation pipeline 31 is connected to the wall of the first pipeline 4 near the outlet end 41 of the first pipeline 4.
In the present embodiment, the cross-sectional area of the nozzle 42 is reduced from the outlet end 41 of the first pipeline 4 to the liquid inlet 202, so as to form a structure with a liquid-phase flow restriction function, and the nozzle 42 can prevent the generation of gas-liquid mixing phenomenon, and can set the flow rate of the liquid-phase medium entering the first heat exchange element 20 specifically by changing the size of the nozzle; the flow rate of the nozzle 42 is determined according to the pressure of the sampling unit 1, the pressure of the first gasifying unit 2, the demand of the liquid-phase medium which can be gasified by the first gasifying unit 2 and the demand of the analyzing unit, and a certain margin is required to be left; for example, the liquid phase medium is taken out from the liquid phase medium sampling pipeline through the sampling probe 10, the pressure is P1, the pressure of the gasified gas to be collected by the first gasification unit 2 is P2, and the flow rate of the nozzle 42 is determined according to the demand of the analysis unit and the first gasification unit 2, P1, P2 and other factors.
Further, in some preferred embodiments of the present invention, the sampling device further comprises a closed vacuum insulation shell 5, the sampling unit 1 and the throttling unit 3 are integrated in the vacuum insulation shell 5, and the inlet end 101 of the sampling probe 10 is exposed out of the vacuum insulation shell 5, so as to facilitate the collection of samples.
In the present embodiment, the vacuum insulation housing 5 forms a vacuum chamber therein for accommodating the sampling unit 1 and the throttling unit 3 and providing a vacuum insulation environment. Through form the vacuum environment in vacuum thermal-insulated shell 5, not only can effectively avoid getting into the super-cooled liquid medium in sampling unit 1 and the throttle unit 3 and the external world and carry out the heat exchange, and can keep apart the cryogenic environment of sampling unit 1 and throttle unit 3 and the heating environment of first gasification unit 2, prevent to carry out the cold and hot convection between above-mentioned each unit, thereby effectively restrain low boiling point component among the liquid medium and gasify in advance, guarantee that the liquid medium before getting into the gasification unit keeps liquid, thereby ensure to obtain representative sample, improve the accuracy of liquid medium component analysis.
Further, in some preferred embodiments of the present invention, the vacuum insulation casing 5 is integrally vacuum-sealed and molded by an insulation material on the outer sides of the sampling unit 1 and the throttling unit 3.
The heat insulation material can effectively block heat conduction, heat convection and heat radiation, plays a role in heat insulation and cold insulation, and can include but is not limited to aluminum foil, glass fiber paper, glass fiber tape or nanotube material and the like. The vacuum chamber of the vacuum heat insulation shell 5 not only ensures that the temperature of the liquid phase medium in the chamber is basically consistent with the temperature of the sampling point in the vacuum environment with extremely low heat leakage rate, but also plays a role in absorbing heat in the process of transferring the liquid phase medium, and can absorb heat once the liquid phase medium is gasified, thereby providing larger supercooling degree. Wherein, the vacuum degree of the vacuum heat insulation shell 5 can be 10-3And Pa, adjusting according to the actual application environment. In addition, the vacuum heat insulation shell 5 adopts one-time vacuum packaging, and has the advantages of long service life and small maintenance amount.
Further, in some preferred embodiments of the present invention, as shown in fig. 1, a heat insulation structure 400 formed of a heat insulating material is provided at the connection of the first vaporizing unit 2 and the nozzle 42 to isolate the cryogenic environment of the sampling unit 1 and the throttling unit 3 from the heating environment of the first vaporizing unit 2 for preventing heat and cold exchange between the above units, thereby effectively suppressing premature vaporization of the low boiling point component in the liquid phase medium, wherein the heat insulation structure 400 is covered at the opening of the casing 21 of the first vaporizing unit 2 by a structure similar to a heat insulation cover formed of a heat insulating material, and at least a portion of the first heat exchange element 20 is wrapped by the heat insulation structure 400.
Further, in some preferred embodiments of the present invention, a first valve 6 for controlling the on-off of the sampling unit 1 is disposed on the first pipeline 4 between the sampling unit 1 and the throttling unit 3.
In this embodiment, the inlet end 101 of the sampling probe 10 is inserted into the liquid phase medium sampling pipe 100, the outlet end of the sampling probe 10 is connected with the inlet end of the first valve 6, the outlet end of the first valve 6 is connected with the nozzle 42 through the first pipeline 4, and the liquid phase medium enters from the inlet end 101 of the sampling probe 10, and enters into the first gasification unit 2 through the first valve 6, the first pipeline 4 and the nozzle 42. During the sampling analysis, the first valve 6 is kept in an open state; when the device of the invention needs to be taken out of service for maintenance, the first valve 6 is closed, thus shutting off the sample analysis operation.
Further, in some preferred embodiments of the present invention, the first valve 6 is a low temperature resistant stop valve, a free end of a valve rod 60 of the low temperature resistant stop valve is exposed outside the vacuum insulation shell 4, and the opening and closing of the first valve 6 can be conveniently realized by adjusting and controlling the valve rod 60.
In the embodiment, the low temperature resistant stop valve may be a manual stop valve or an automatic stop valve, wherein the automatic stop valve may be opened and closed by the driving of a cylinder or a motor.
Further, in some preferred embodiments of the present invention, the present invention further comprises a discharge unit 7 communicated with the throttling unit 3, and configured to gasify a gas-liquid mixed phase generated by decompression gasification in the throttling unit 3 and then convey the gasified gas-liquid mixed phase to the gas recovery header pipe 8;
the discharge unit 7 comprises a second pipeline 70 connecting the outlet end 312 of the liquid separation pipeline 31 and the gas recovery header pipe 8, and a second gasification unit 71 for gasifying the gas-liquid mixed phase is arranged on the second pipeline 70; wherein the outlet end 312 of the liquid separation pipeline 31 is close to the sampling unit 1.
In the present embodiment, the outlet end 312 of the liquid distribution pipe 31 is communicated with the second gasification unit 71 through the second pipe 70, and the liquid-liquid mixture phase discharged from the throttling element 30 sequentially enters the second gasification unit 71 through the outlet end 312 and the second pipe 70, is gasified into a gas by the second gasification unit 71, and then is merged into the gas recovery header 8; wherein, the second gasification unit 71 may include the first heat exchange element 20 as described above, and the second gasification unit 71 may also include a gasifier commonly used in the art, which is not limited in the present invention;
wherein the inlet end 311 of the liquid separation pipeline 31 is close to the first gasification unit 2, and the outlet end 312 of the liquid separation pipeline 31 extends from the throttling element 30 to a direction close to the sampling unit 1, so that the liquid separation pipeline 31 is completely integrated in the vacuum insulation shell 5; in the process that the gas-liquid mixed phase in the liquid separation pipeline 31 flows to the outlet end 312, kinetic energy is converted into heat energy to be continuously gasified, and the heat energy is absorbed in the process to ensure that the liquid-phase medium in the first pipeline 4 has enough cold energy, so that the liquid-phase medium cannot be gasified before entering the first gasification unit 2, and the excessive loss of the sample can be avoided.
Further, in some preferred embodiments of the present invention, the discharging unit 7 further comprises a pressure transmitter 72 and a second valve 73 disposed between the second gasification unit 71 and the gas recovery manifold 8; the second valve 73 is a back pressure valve.
Wherein a pressure transmitter 72 and a second valve 73 are sequentially provided in the gas flow direction, the pressure transmitter 72 is used for detecting the pressure of the gas in the second pipeline 70, and the second valve 73 is used for regulating the pressure of the gas in the second gasification unit 71.
In the present embodiment, for example, when the liquid-phase medium to be sampled and analyzed is LNG, a small amount of LNG entering the throttling unit 3 is subjected to reduced-pressure flash vaporization to generate a gas-liquid mixed phase, the gas-liquid mixed phase is heated in the second vaporizing unit 71 to generate BOG (boil of gas) gas, and the gas is returned to the BOG header pipe through the discharging unit 7, so that the recovery of the gas is realized. After the BOG gas generated in the second gasification unit 71 absorbs heat, the pressure in the second gasification unit 71 rises, and when the pressure reaches the set pressure, the second valve 73 opens to discharge the BOG gas generated in the second gasification unit 71 to the BOG header pipe, and the second valve 73 ensures that the pressure in the second gasification unit 71 is stable, thereby ensuring that the pressure in the throttle unit 3 is stable.
Further, in some preferred embodiments of the present invention, an electric tracing band 74 is provided on the second pipeline 70.
In the present embodiment, the electric tracing band 74 is enclosed in the second pipeline 70 between the throttling unit 3 and the gas recovery header 8, and heats the exhaust gas, which may carry a small amount of liquid, to ensure that the medium entering the gas recovery header 8 is in a gaseous state.
Further, an electric trace band 74 is also provided on the line connecting the analysis unit and the outlet port 210 of the first vaporizing unit 2 to ensure that the medium entering the analysis unit is in a gaseous state.
Further, in some preferred embodiments of the present invention, temperature measuring elements 9 are disposed on the first heat exchanging element, the first pipeline close to the nozzle, and the second pipeline between the throttling unit and the second vaporizing unit; the temperature measuring element 9 is used for detecting the temperature in real time, wherein the temperature measuring element can be a temperature sensor.
Furthermore, a temperature measuring element is also arranged on the pipeline connecting the analysis unit and the gas outlet 210 of the first gasification unit 2, so as to monitor the temperature of the medium entering the analysis unit in real time.
When the device for sampling and gasifying the liquid-phase medium is used, the front end of the sampling unit 1 is connected to a sampling pipeline 100 or a container (such as a liquid-phase medium discharge main pipe or a tank car loading main pipe) needing component analysis through a flange or other fixing parts; in some embodiments, a sampling port is disposed on the sampling pipe 100, a pipe wall of the sampling pipe 100 around the sampling port protrudes outward to form a short neck 200, a front end of the sampling unit 1 is inserted into the short neck 200 and is fixed to the sampling pipe 100 through a flange 300, wherein an inlet end 101 of the sampling probe 10 is exposed outside the vacuum heat insulation shell 5, a sample in a liquid phase in the sampling pipe 100 is collected, and the sample enters the first gasification unit 2 from the inlet end 101 of the sampling probe 10 through the first valve 6 and the nozzle 42 to be gasified, wherein a small amount of and a fixed amount of liquid phase medium absorbs heat in the throttling unit 3, so that a supercooling degree of a remaining majority of liquid phase medium before entering the first gasification unit 2 is increased, and the liquid phase medium before entering the first gasification unit 2 is prevented from being gasified in advance.
According to the invention, the throttling unit 3 and the vacuum heat insulation shell 5 are arranged to ensure that the enthalpy increment of the liquid-phase medium from the sampling probe 10 to the first gasification unit 2 is less than the supercooling degree of the liquid-phase medium at the inlet end 101 of the sampling probe 10, so that the liquid-phase medium is ensured not to be fractionated before entering the first gasification unit 2 for gasification, and all components of the liquid-phase medium entering the first gasification unit 2 are ensured to be gasified simultaneously; in addition, the liquid phase medium is heated by the first heat exchange element 20 with high energy density, so that each component in the liquid phase medium can rapidly complete phase state conversion, the gasification time is shortened, and the accuracy of a sample analysis result is further improved.
Wherein the heat absorption of the liquid phase medium during sampling is calculated according to the following formula (1) in ISO 8943-2007:
in the formula:
Q-Heat absorption, unit W;
Ta-ambient temperature, in K;
Ts-temperature of the liquid medium in units K;
hacoefficient of heat transfer surface of insulating material of vacuum insulating envelope, unit W/m2·K；
k-thermal conductivity of the insulating material of the vacuum insulating envelope, unit W/m2·K；
D0-the outer diameter of the vacuum insulation envelope in m;
D1-the inner diameter of the vacuum insulation envelope in m;
l is the effective length of the liquid medium passing from the inlet end of the sampling probe to the outlet end of the throttling gasification unit, and the effective length is m.
The heat absorption in the sampling process refers to the heat absorbed by the liquid phase medium flowing from the inlet end of the sampling probe to the outlet end of the throttling gasification unit. In the formula haAnd k is associated with the insulating material constituting the vacuum insulation envelope; d0And D1In relation to the size of the vacuum insulation envelope and the thickness of the insulation material constituting the vacuum insulation envelope.
Wherein, the enthalpy increment of the liquid phase medium in the sampling process is calculated according to the following formula (2):
in the formula,. DELTA.H1Is enthalpy gain, and the unit is J/kg; q is the heat absorption calculated according to equation (1); l is the same as formula (1); f is the flow of the liquid phase medium, and the unit kg/h can be obtained by calculation according to the diameter of the sampling probe and the pressure in the sampling probe.
The enthalpy increment in the sampling process refers to the enthalpy increment of the liquid phase medium flowing from the inlet end of the sampling probe to the outlet end of the throttling gasification unit.
Wherein, the enthalpy change amount generated by the phase change in the throttling gasification unit is calculated according to the following formula (3):
ΔH2＝mΔvapHm (3)
in the formula,. DELTA.H2Is enthalpy change with the unit of J/kg; m is the mass of the liquid phase medium generating the phase change; Δ VapHmIs an enthalpy variable in kilograms of liquid-phase medium.
Based on the above-mentioned Δ H2The supercooling degree of the liquid phase medium in the throttling gasification unit due to phase change can be obtained according to an enthalpy curve in the ISO8943 standard; based on the above-mentioned Δ H1And Δ H2The total enthalpy gain of the liquid phase medium before entering the gasification unit can be obtained.
The foregoing description is only exemplary of the preferred embodiments of the invention and is illustrative of the principles of the technology employed. It will be appreciated by those skilled in the art that the scope of the invention herein disclosed is not limited to the particular combination of features described above, but also encompasses other arrangements formed by any combination of the above features or their equivalents without departing from the spirit of the invention. For example, the above features and (but not limited to) features having similar functions disclosed in the present invention are mutually replaced to form the technical solution.
Claims (10)
1. An apparatus for sampling and vaporizing a liquid phase medium, comprising:
the sampling unit comprises a sampling probe and is used for collecting the liquid phase medium;
the first gasification unit is used for gasifying the liquid-phase medium collected by the sampling unit; and
the throttling unit is arranged on a first pipeline for connecting the sampling unit and the first gasification unit, and is configured to adjust the flow of the liquid-phase medium entering the first gasification unit and enable the liquid-phase medium entering the first gasification unit to have a sufficient supercooling degree based on decompression and gasification.
2. The apparatus for liquid phase medium sampling and gasification according to claim 1, wherein the throttling unit comprises a throttling element and a liquid dividing line, the throttling element being disposed on the liquid dividing line;
the throttling element comprises a shell, a liquid inlet and a liquid outlet are arranged at two opposite ends of the shell, a throttling channel is arranged in the shell, and the liquid inlet, the liquid outlet and the throttling channel are communicated with each other; the cross-sectional area of the throttling channel is gradually reduced and then gradually increased from the liquid inlet to the liquid outlet;
the liquid medium part collected by the sampling unit enters the first gasification unit through the first pipeline, and the other part of the liquid medium collected by the sampling unit enters the throttling element through a liquid distribution pipeline communicated with the first pipeline, and is subjected to pressure reduction gasification to generate a gas-liquid mixed phase which is discharged from the liquid outlet.
3. The apparatus for liquid phase medium sampling and gasification according to claim 2, wherein the first gasification unit comprises a first heat exchange element;
the first heat exchange element comprises a columnar heat conduction body, a liquid flow channel extending along the length direction of the columnar heat conduction body is arranged in the columnar heat conduction body, one end of the liquid channel is provided with an opening to form a liquid inlet, and the other end of the liquid channel is closed; wherein, a plurality of through holes communicated with the liquid flow channel are arranged on the columnar heat conduction body surrounding the liquid flow channel, and the outlet of each through hole is connected with a guide pipe; and liquid-phase medium from the sampling unit enters the liquid flow channel through the liquid inlet, and gas generated by heating and gasification is discharged through the through hole and the guide pipe and is converged at the outlet end of the guide pipe.
4. The apparatus for liquid phase medium sampling and gasification according to claim 3, wherein a nozzle is provided between the outlet end of the first pipeline and the liquid inlet, the liquid phase medium enters the liquid flow passage through the nozzle, and the outlet of the nozzle is in a necking structure; the inlet end of the liquid separation pipeline is connected to the wall of the first pipeline close to the outlet end of the first pipeline.
5. The apparatus for liquid phase media sampling and gasification according to claim 4, further comprising a closed vacuum insulation enclosure, wherein the sampling unit and the throttling unit are integrated within the vacuum insulation enclosure, and the inlet end of the sampling probe is exposed outside the vacuum insulation enclosure.
6. The device for liquid phase medium sampling and gasification according to claim 5, wherein a first valve for controlling the on-off of the sampling unit is arranged on the first pipeline, and the free end of a valve rod of the first valve is exposed out of the vacuum heat insulation shell; preferably, the first valve is a low temperature resistant shut-off valve.
7. The device for sampling and gasifying the liquid-phase medium according to claim 5, further comprising a discharge unit communicated with the throttling unit, and used for gasifying a gas-liquid mixed phase generated by the decompression and gasification of the throttling unit and then conveying the gasified gas-liquid mixed phase to a gas recovery header pipe;
the discharge unit comprises a second pipeline which is connected with the outlet end of the liquid separation pipeline and the gas recovery header pipe, and a second gasification unit for gasifying the gas-liquid mixed phase is arranged on the second pipeline; wherein the outlet end of the liquid separation pipeline is close to the sampling unit.
8. The apparatus for liquid phase media sampling and gasification of claim 7, wherein the discharge unit further comprises a pressure transmitter and a second valve disposed between the second gasification unit and the gas recovery manifold; the second valve is a back pressure valve.
9. Device for the sampling and gasification of a medium in the liquid phase according to claim 7 characterized in that the second line is provided with an electric tracing band.
10. The apparatus according to claim 7, wherein a temperature measuring element is disposed on the first heat exchange element, the first pipeline close to the nozzle, and the second pipeline between the throttling unit and the second vaporizing unit.
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| CN202010652011 | 2020-07-08 | ||
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023197196A1 (en) * | 2022-04-13 | 2023-10-19 | 中海石油气电集团有限责任公司 | High-compactness lng sampling and gasifying device having self-adaptive function |
| NL2033492B1 (en) * | 2022-04-13 | 2023-11-03 | Cnooc Gas & Power Group | Highly compact lng sampling and gasification apparatus with self-adaptive function |
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2020
- 2020-10-30 CN CN202011196194.9A patent/CN113916598A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023197196A1 (en) * | 2022-04-13 | 2023-10-19 | 中海石油气电集团有限责任公司 | High-compactness lng sampling and gasifying device having self-adaptive function |
| NL2033492B1 (en) * | 2022-04-13 | 2023-11-03 | Cnooc Gas & Power Group | Highly compact lng sampling and gasification apparatus with self-adaptive function |
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