CN106289428A - Cool down device and metering system - Google Patents

Abstract

Disclosed are a degassing device and a metering system. The degassing device includes: a substantially cylindrical closed casing; an input pipe extending from the outside of the casing to the inside of the casing, and the end of the inlet pipe located inside the casing is formed into a roughly arc-shaped portion, so that The fluid flowing into the casing forms a vortex to promote the separation of gas and liquid in the fluid, and the separated gas accumulates in the upper part of the casing; the output pipe extends from the outside of the casing to the inside of the casing at the lower part of the input pipe, To drain the liquid in the fluid in the housing. The fluid containing gas enters from the upper part of the degassing device, and the liquid in the fluid is discharged from the lower part of the degassing device. The air bubbles in the fluid have a longer floating distance, and the gas floats to a sufficient distance from the outlet of the output pipe before the liquid is discharged, so that It will not be discharged with the liquid; the mass flowmeter installed on the output pipeline only measures the liquid part that does not contain gas, thereby improving the measurement accuracy.

Description

Gas eliminator and metering system

technical field

Embodiments of the present invention relate to a gas getter, and in particular, to a gas getter capable of eliminating gas in a fluid including liquid and gas, and a metering system including the gas getter.

Background technique

With the improvement of the degree of industrialization and people's living standards, the demand for liquid chemical products (such as refined oil, liquid chemical raw materials, etc.) is increasing. In order to store liquid chemical products, various storage tanks have been built in ports mainly along the river and along the coast. In the process of trading liquid chemical products, it is necessary to unload the liquid chemical products transported by ships into storage tanks through pipelines. The current international custody transfer method is based on the ship inspection quantity or tank inspection quantity, because of the objective existence of the system Errors and accidental errors have resulted in numerous international and domestic custody transfer disputes. Internationally and internationally, the default acceptable measurement error is less than 3‰, while the batches with custody transfer measurement error of the actual liquid chemical products exceeding 3‰ account for the total transaction volume. 20%-30% of the batch will cause huge losses to the country and enterprises; and it will cost a huge amount of money for the calibration capacity, the measurement of each qualification unit, and the long and complicated handover process.

At present, Micro Motion's mass flowmeter (measurement accuracy can reach 0.5‰) is also used at home and abroad to directly measure the mass of the flowing liquid, but because the accuracy is greatly reduced under the condition of gas-liquid two-phase, it is limited to the liquid that does not contain Custody transfer for any gas service.

At present, we are looking for the possibility of using degassing equipment to remove the gas in the liquid first, and then measure it through a high-precision mass flowmeter. However, the degassing equipment that has been developed cannot completely eliminate the gas contained in the liquid, especially when the gas content gradually increases. Larger, even up to 100%, the degassing effect is significantly reduced.

Contents of the invention

In order to overcome the above-mentioned or other defects in the prior art, the present invention proposes a degassing device and a metering system including such a degassing device, which can automatically eliminate all the gases in the fluid to be metered at 0%-100% content, In this way, the accurate metering of fluid mixed with gas can be realized.

According to an embodiment of an aspect of the present invention, there is provided a degassing device, comprising: a substantially cylindrical closed casing; an input pipe extending from the outside of the casing to the inside of the casing, and the input The end of the pipe located inside the housing is formed into a substantially arc-shaped portion, so that the fluid flowing into the housing through the input pipe forms a vortex to promote the separation of gas and liquid in the fluid, and the separated Gas accumulates in the upper part of the housing; an output pipe, in the lower part of the input pipe, extends from the outside of the housing to the inside of the housing to discharge liquid in the fluid in the housing.

The degassing device according to an embodiment of the present invention further includes: a substantially cylindrical screen installed inside the housing and having a predetermined distance from the inner wall of the housing, the screen and the housing The height of the cylindrical part of the body is approximately the same.

According to an embodiment of the degassing device of the present invention, the arc portion is arranged to be inclined downward relative to the liquid surface of the fluid.

According to an embodiment of the degassing device of the present invention, the diameter of the circle where the arc-shaped portion is located is 3-4 times the inner diameter of the input pipe.

According to the degassing device of an embodiment of the present invention, a liquid level gauge is provided between the screen and the housing, and an exhaust valve is provided on the top of the housing, and the exhaust valve is The result is on or off.

According to an embodiment of the degassing device of the present invention, the screen comprises:

The upper segment, in the upper segment, has 1500-2500 first sieve holes per square meter, and the aperture of each first sieve hole is 15-20 mm;

an intermediate section, in which there are 3000-5000 second meshes per square, each second mesh having a hole size of 10-15 mm; and

The lower section, in the lower section, has 2000-4000 third sieve holes per square meter, and the aperture of each third sieve hole is 10-15 mm.

According to an embodiment of the degassing device of the present invention, the screen comprises:

The upper section, in the upper section, there are 3000-5000 first sieve holes per square meter, and the aperture of each first sieve hole is 10-15 mm;

The middle section, in which there are 4000-6000 second meshes per square, and the holes of each second mesh are 5-10 mm; and

The lower section, in the lower section, has 6000-20000 third mesh holes per square meter, and the hole diameter of each third mesh hole is 5-10 mm.

According to an embodiment of another aspect of the present invention, there is provided a metering system, comprising: the gas eliminator described in the various embodiments above; and a mass flowmeter, installed outside the housing of the gas eliminator at the output On the pipeline, the inner diameter D2 of the shell is determined by the following _formula :

Wherein, C ₁ is the first matching coefficient, and the value range of C ₁ is 1.7-1.9, η ₁ is the kinematic viscosity coefficient of water, η ₂ is the kinematic viscosity coefficient of the liquid component in the fluid, and D ₁ is the mass flow meter The inner diameter of the inlet, Fv is the design flow rate of the mass flow meter.

According to an embodiment of the metering system, the first matching coefficient is 1.75-1.85, preferably 1.8.

According to one embodiment of the metering system, a liquid level gauge is provided between the screen and the housing, an exhaust valve is provided on the top of the housing, and a regulating valve is provided on the output pipeline, so The above-mentioned exhaust valve and regulating valve are opened or closed according to the measurement results of the displacement meter.

According to an embodiment of the metering system, the _first height H1 of the housing from the bottom to the top is determined by the following formula:

Wherein, C ₂ is the second matching coefficient, and the value range of C ₂ is 3.8-4.2, preferably 4.

The metering system according to an embodiment further comprises a control system, and when the first height difference between the inlet of the output pipe and the liquid level measured by the liquid level gauge is greater than the second height _H2 , the control system The system controls the regulating valve to remain in an open state, and when the first height difference is not greater than the second height _H2 , the control system controls the regulating valve to remain in a closed state,

The second height _H2 is determined by the following formula:

Wherein, C3 is the _third matching coefficient, and the value range of C3 is 0.8-1.2, preferably ₁ .

According to an embodiment of the metering system, when the second height difference between the liquid level measured by the liquid level gauge and the top of the housing is less than or equal to the _third height H3, the control system controls the The exhaust valve remains closed,

The _third height H3 is determined by the following formula:

Wherein, _C4 is the fourth matching coefficient, and the value range of _C4 is 1.5-2.1, preferably 1.8.

According to an embodiment of the metering system, the mass flow meter is a Coriolis flow meter.

According to an embodiment of the metering system, an emptying pipe is provided at the bottom of the casing, and an emptying valve is installed on the emptying pipe.

According to an embodiment of the metering system, the liquid level gauge includes a float that rises or falls with the liquid level, and the first travel switch and the The second travel switch, the cooperation of the floating ball and the first travel switch triggers the switching of the regulating valve, and the cooperation of the floating ball and the second travel switch triggers the closing of the exhaust valve.

According to an embodiment of the metering system, the liquid in the fluid is refined oil or liquid chemical raw material.

According to the degassing device and the metering system of the above-mentioned various embodiments of the present invention, the fluid containing gas enters from the upper part of the degassing device, the liquid in the fluid is discharged from the lower part of the degassing device, and the air bubbles in the fluid have a longer floating distance. Before the liquid is discharged, the gas floats up to a sufficient distance from the outlet of the output pipeline, so that it will not be discharged with the liquid; in this way, the mass flowmeter installed on the output pipeline only measures the liquid part that does not contain gas, thereby improving the measurement accuracy.

Description of drawings

In order to make the purpose, features and advantages of the present invention more obvious and understandable, the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments, wherein:

Fig. 1 is a schematic diagram of the principle of a metering system according to an exemplary embodiment of the present invention;

Figure 2 is a detailed schematic diagram of a metering system according to an exemplary embodiment of the present invention;

Fig. 3 is the schematic diagram of the principle of the degassing device according to an exemplary embodiment of the present invention; And

Fig. 4 is a schematic diagram of the principle of a test system for verifying the metering effect of the metering system of the embodiment of the present invention.

detailed description

While the present invention will be fully described with reference to the accompanying drawings containing preferred embodiments of the invention, it should be understood before proceeding that those skilled in the art may modify the invention described herein while obtaining the technical effects of the present invention. Therefore, it should be understood that the above description is a broad disclosure for those skilled in the art, and its content is not intended to limit the described exemplary embodiments of the present invention.

In addition, in the following detailed description, for purposes of explanation, numerous specific details are set forth in order to provide a comprehensive understanding of the embodiments of the present disclosure. It may be evident, however, that one or more embodiments may be practiced without these specific details. In other instances, well-known structures and devices are shown in diagrammatic form to simplify the drawings.

Referring to Figures 1-3, according to an exemplary embodiment of the present invention, a metering system 8 is provided, including: a degassing device 3 for eliminating gas components in a fluid and a mass flow meter for metering liquid in the fluid 6. The air getter 3 comprises a substantially cylindrical closed housing 31 , for example made of stainless steel material, an inlet duct 24 and an outlet duct 25 . The input pipe 24 extends from the outside of the housing 31 to the inside of the housing 31, and the end of the input pipe 24 positioned at the inside of the housing 31 is formed into a substantially arc-shaped portion 241, so that the fluid flowing into the housing 31 through the input pipe 24 is subjected to Driven to form a vortex to promote the separation of gas and liquid in the fluid, and the separated gas accumulates in the upper part of the housing 31 , while the liquid part remains in the lower part of the housing 31 . The output pipe 25 extends from the outside of the housing 31 to the inside of the housing 31 at the lower part of the input pipe 24 to discharge the liquid in the fluid in the housing 31 . The mass flowmeter 6 is installed on the output pipeline 24 of the gas getter 3 outside the housing 31 of the gas getter 3, and the inner diameter D of the housing 31 is determined by the following _formula (1):

Wherein, C ₁ is the first matching coefficient, and the value range of C ₁ is 1.7-1.9, η ₁ is the kinematic viscosity coefficient of water under a certain temperature, η ₂ is the kinematic viscosity coefficient of the liquid component in the fluid under the same temperature, D ₁ is the inner diameter of the inlet of the mass flow meter 6 , and Fv is the design flow or rated flow of the mass flow meter 6 . In an exemplary embodiment, the first matching coefficient is 1.75-1.85, preferably 1.8.

The metering system 8 according to the embodiment of the present invention is suitable for use in a delivery system that transports refined oil or liquid chemical raw materials that may be mixed with air bubbles 21 from the ship 2 to the storage tank 9, and realizes the measurement of the transported refined oil or liquid chemical raw materials. Raw materials are accurately measured. In this case, the liquid 5 in the fluid is a liquid chemical product, including refined oil or liquid chemical raw material.

In the metering system 8 of the embodiment of the present invention, the degassing device 3 cooperates with the mass flow meter 6, and the degassing device 3 eliminates the gas in the fluid containing two components of gas and liquid from the outside (such as a ship). Since the content of gas components contained in the fluid may be different in different environments (such as temperature, actual liquid level in the ship, ship running distance, degree of turbulence during transportation, etc.), but no matter how many gas components are contained in the fluid, the It can be eliminated by the degassing device, and the mass flowmeter only measures the liquid components in the fluid, so that the measurement accuracy of the liquid components that actually need to be measured can be improved. Further, it can be seen from formula (1) that due to the inner diameter of the housing of the degasser 3 and the kinetic viscosity coefficient η ₁ of water, the kinetic viscosity coefficient η ₂ of the liquid component in the fluid, and the inner diameter D of the inlet of the mass flowmeter 6 _1. It is related to the design flow rate Fv of the mass flow meter 6. Especially in the case where the first matching coefficient _C1 is about 1.8, it can ensure that a vortex is formed in the housing 31 to discharge the gas in the fluid located in the lower part of the housing 31 to the upper part of the housing, thereby achieving the purpose of eliminating gas, In addition, the fluid can flow continuously in the input pipeline 24, the degassing device 3 and the output pipeline 25, so as to ensure continuous and fast unloading of refined oil or liquefied chemical raw materials on the ship 2.

In addition, in the degassing device, the fluid enters from the upper part, and the liquid is discharged from the lower part. The position of the outlet of the arc-shaped part 241 of the input pipe 24 is higher than the position of the inlet 251 of the output pipe 25, which can ensure that the air bubbles in the fluid have a longer floating time. Before the liquid is discharged, it floats to a sufficient distance from the inlet 251 of the output pipe 25, and the gas will not be discharged with the liquid. In addition, the housing 31 includes a cylindrical part and an arc-shaped part positioned at the upper and lower ends of the cylindrical part; the position of the outlet of the input pipe 24 in the housing 3 is located in the area above the height 1/3 of the housing 31; the output pipe The outlet 251 of 25 within the housing 31 is located approximately in the area of the bottom of the cylindrical portion of the housing.

The degassing device according to the embodiment of the present invention also includes a substantially cylindrical screen 20, the screen 20 is installed inside the housing 31 and has a predetermined distance from the inner wall of the housing 31, the screen 20 and the cylinder of the housing 31 The sections are about the same height. Both the outlet of the arc portion 241 of the input pipe 24 and the inlet 251 of the output pipe 25 are located inside the screen 20 . A plurality of circular screen holes 201 with a diameter of 5mm-20mm are evenly distributed on the cylindrical screen 20 . By setting the screen 20, the fluid repeatedly flows through the mesh 201 on the screen 20 due to the vortex flow in the housing 31, which can further expand the air filtering surface and improve the effect of filtering gas.

In one embodiment, the screen 20 includes: an upper section whose height is about one-third of the height of the screen, and in the upper section, there are 1500-2500 first screen holes per square meter, each first screen hole The hole diameter is 15-20 mm; its height is about one-third of the middle section of the screen height, in the middle section, there are 3000-5000 second screen holes per square, and each second screen hole holes of 10-15 mm; and a lower section whose height is about one-third of the height of the screen, in which there are 2000-4000 third mesh holes per square meter, each third mesh hole having a hole diameter of 10-15mm. In this way, the transmittance per square meter can be kept at 60%-80%.

In an alternative embodiment, the screen 20 includes: an upper section whose height is about one-third of the screen height, and in the upper section, there are 3000-5000 first screen holes per square meter, each The aperture of a first screen hole is 10-15 millimeters; Its height is about the middle section of about one-third of the screen height, and in said middle section, there are 4000-6000 second screen holes per square, each The hole of the second screen hole is 5-10 millimeter; And its height is about the lower section of about one-third of the height of the screen, in the lower section, there are 6000-20000 third screen holes per square meter, each The aperture of the three sieve holes is 5-10 mm. In this way, the transmittance per square meter can be kept at 60%-80%.

In a further embodiment of the degassing device, the arc portion 241 is arranged to be inclined downward relative to the liquid surface of the fluid. Due to the annular and downwardly inclined structure of the arc portion 241 of the input pipe 24, under the pressurization of the input pump (not shown), the fluid in the housing 31 forms a vortex and descends, and the air bubbles ascend by buoyancy, which can improve filtration. degassing effect. In addition, the vortex descending fluid repeatedly passes through the cylindrical screen 20 to repeatedly filter the air bubbles, which can further improve the effect of filtering gas.

In one embodiment, the diameter of the circle where the arc portion 241 is located is 3-4 times the inner diameter of the input pipe 24 . In this way, the fluid enters the housing 31 and rotates downward. When the liquid level rises, the stroke of the fluid in the housing 31 will be longer, and the number of rotations will be more and more. The bubbles in the fluid have a longer time to float. The part floats up to a sufficient distance from the inlet 251 of the output pipeline 25 before being discharged, so as not to enter the output pipeline 25 with the liquid, thereby improving the purity of the liquid in the output pipeline 25 .

In one embodiment, a liquid level gauge 17 is provided between the screen 20 and the housing 31, an exhaust valve 19 is provided on the top of the housing, and a regulating valve 23 is provided on the output pipeline 25. The exhaust valve 19 and regulating valve 25 are opened or closed according to the measurement result of displacement meter 17.

In the metering system 8 of the embodiment of the present invention, as shown in FIG. 3, the _first height H1 of the housing 31 from the bottom to the top is determined by the following formula:

Wherein, C ₂ is the second matching coefficient, and the value range of C ₂ is 3.8-4.2, preferably 4. It can be understood that the first height H ₁ is the height of the accommodation space in the casing 31 . By determining the internal height and inner diameter D ₂ of the housing 31, the volume of the housing 31 can be basically determined, further ensuring that a vortex is formed in the housing 31 to eliminate gas, and the fluid can flow through the input pipe 24, the degassing device 3 and the output. Continuous flow in the pipeline 25 ensures continuous and fast unloading of refined oil or liquid chemical raw materials on the ship 2 .

The metering system 8 of an embodiment of the present invention further includes a control system (not shown), when the first height difference between the inlet 251 of the output pipe 25 and the liquid level measured by the liquid level gauge 15 is greater than the second height When _H2 , the control system controls the regulating valve 23 installed on the output pipeline 25 to remain in an open state, so that the liquid is delivered to the storage tank 9 through the output pipeline 25; when the height difference is not greater than the second height _H2 , the The control system controls the regulating valve to remain in a closed state to ensure that gas or liquid mixed with gas will not be discharged from the inlet 251;

The second height _H2 is determined by the following formula:

Wherein, C3 is the _third matching coefficient, and the value range of C3 is 0.8-1.2, preferably ₁ . In this way, the liquid level in the housing 31 can be kept higher than the second height H ₂ , ensuring that the stroke of the fluid in the housing 31 is lengthened, and the gas will not enter the output pipe 25 with the liquid; Pipeline 24, degassing device 3 and output pipeline 25 flow continuously.

In a further embodiment, when the second height difference between the liquid level measured by the liquid level gauge 15 and the top of the housing 31 is less than or equal to the _third height H3, the control system controls the exhaust valve 19 to maintain in the off state,

The _third height H3 is determined by the following formula:

Wherein, _C4 is the fourth matching coefficient, and the value range of _C4 is 1.5-2.1, preferably 1.8.

When the second height difference between the liquid level measured by the liquid level gauge 15 and the top of the housing 31 is less than or equal to the _third height H3, the control system controls the exhaust valve 19 to switch to the closed state, thereby avoiding the liquid Exhausted from the exhaust pipe 13. Due to the closure of the exhaust valve 19, the gas accumulated on the upper part of the housing 31 gradually increases, the gas pressure increases, and the liquid level drops. When the liquid level drops to a height corresponding to the _second height H2, while the regulating valve 23 is closed, Open the exhaust valve 19 to discharge the gas accumulated on the upper part of the liquid level, so that the gas pressure is reduced and the liquid level of the fluid rises.

In an exemplary embodiment, mass flow meter 6 is a Coriolis mass flow meter. For example, the high precision mass flowmeter produced by Emerson Process Control Co., Ltd. of the United States can be selected, and its accuracy is 1‰.

In an exemplary embodiment, an emptying pipe 14 is provided at the bottom of the casing 31 , and an emptying valve 141 is mounted on the emptying pipe 14 to empty the liquid remaining in the casing 31 . In various embodiments of the present invention, the emptying valve 141, the exhaust valve 19 and the regulating valve 23 can all be electric valves.

In an exemplary embodiment, the liquid level gauge 15 includes a float 17 that rises or falls with the liquid level, and the housing 31 is provided with first heights corresponding to the second height _H2 and the _third height H3 respectively. The travel switch 18 and the second travel switch 16, the cooperation of the float ball 17 and the first travel switch 18 trigger the switching of the regulating valve 23, and the cooperation of the float ball 17 and the second travel switch 16 triggers the closing of the exhaust valve 19. The liquid level gauge 15 can be made of a stainless steel pipe with a diameter of 10mm-20mm, and its length is four-fifths of the overall height inside, and the floating ball 17 is installed on the steel pipe.

Although in the above embodiments, a certain kinematic viscosity coefficient is used to determine the parameters of the relevant components of the metering system, the present invention is not limited thereto. Any liquid medium with a hysteresis coefficient is applicable. For example, water at 20°C is selected as the transmission medium, and its viscosity coefficient is 1.0050. The metering system made by determining the parameters of the relevant components of the metering system based on this is suitable for the actual working conditions of the metering system. Any liquid medium with kinematic viscosity coefficient less than 1.0050 at the temperature is suitable.

Referring to the above empirical formulas (1)-(4), it is possible to effectively match the specifications of the mass flowmeter, the structure of the degassing device, the design flow rate of the metering system, and the selected metering medium to create an effective and applicable metering system with high accuracy. Up to 1‰.

The following describes the working process of using the degassing device and metering system of the present invention to transport and meter media such as refined oil with reference to FIGS. 1-3 .

First, the input pipeline 24 of the metering system 8 of the embodiment of the present invention is connected to the ship 2 loaded with refined oil (liquid), and the output pipeline 25 is connected to the storage tank 9. At this time, both the regulating valve 23 and the exhaust valve 19 remain closed. In addition, a pump body 10 and a manual valve 12 for extracting fluid are installed on the input pipeline 24, a manual valve 11 is installed on the output pipeline 25, and a liquid level gauge for measuring the liquid level is also provided on the ship 2 and the storage tank 9. Count 1.

Driven by the pump body 10, the fluid 22 containing the air bubbles 21 flows into the degasser 3 from the ship 2 through the input pipeline 24, and the fluid enters from the upper part of the housing 31 from the input pipeline 24, and the liquid level of the fluid in the housing 31 rises. The fluid flowing out from the input pipe 24 rotates and descends in the housing 31 , the liquid level gradually rises, and the air bubbles ascend by buoyancy.

During the rising process of the liquid level of the fluid, when the liquid level rises to the height corresponding to the second height H ₂ (the trigger surface of the regulating valve), the float 17 cooperates with the first limit switch 18, and the control system (not shown) controls The regulating valve 23 is switched from the closed state to the open state to discharge the gas-free liquid from the output pipeline 25. The liquid 5 enters the storage tank 9 after being measured by the mass flow meter 6 installed on the output pipeline 25. At the same time, the exhaust valve is controlled. 19 remains closed. After that, the metering system enters the normal delivery fluid and normal metering state.

During the normal conveying process, as the fluid continuously flows into the degassing device 8, the gas continuously accumulates in the upper part of the closed shell 31, and the pressure on the upper part of the shell 31 increases, causing the liquid level in the shell 31 to drop. When the float ball drops to When corresponding to the height of the second height H ₂ (the triggering surface of the regulating valve), the float 17 cooperates with the first travel switch 18, and the control system controls the electric regulating valve 23 to switch from the open state to the closed state, so as to avoid gas entering the output pipe 25. At the same time, the control system also controls the opening of the exhaust valve 19 to discharge the gas accumulated on the upper part of the liquid level, reduce the pressure of the gas in the casing 31, and raise the liquid level of the fluid. In this case, if the liquid level continues to rise to a height corresponding to the third height H ₃ (exhaust valve trigger surface), the float 17 cooperates with the second travel switch 16, and the control system controls the exhaust valve 19 to close, In order to prevent liquid from entering the exhaust pipe 13. With the exhaust valve 19 kept closed, as the fluid continuously flows into the gas eliminator 8, the gas continuously accumulates in the upper part of the closed housing 31, and the pressure on the upper part of the housing 31 increases, causing the liquid level in the housing 31 to drop, When the float drops to the height corresponding to the second height H ₂ (the trigger surface of the outlet electric valve), the float 17 cooperates with the first travel switch 18, and the control system controls the electric regulating valve 23 to switch from the open state to the closed state and The exhaust valve 19 is controlled to open. In this way, the liquid level of the fluid is limited to continuously float between the first travel switch 18 and the second travel switch 16, thereby realizing the purpose of eliminating gas, and the fluid can be made to flow in the input pipeline 24, the degassing device 3 and the output pipeline 25. Continuous flow ensures continuous and rapid unloading of refined oil products on vessel 2.

Those skilled in the art can understand that using the degassing device and metering system of the embodiment of the present invention can automatically eliminate all the gas in the fluid that needs to be metered, and then measure the mass flow rate and mass of the liquid component that does not contain gas by the mass flow meter. Various variables such as totalizer, density, volume flow rate, volume totalizer, etc. The metering system in the embodiment of the present invention can be configured as an integrated automatic metering system, including a degassing device and a mass flow meter, wherein the mass flow meter includes related sensors, core processors, and transmitters.

In order to verify the actual performance and measurement accuracy of the verification system of the measurement system of the embodiment, a test system as shown in FIG. 4 was assembled. The test system includes: the metering system 8 described in the above-mentioned various embodiments of the present invention, the first water tank 4 that is in fluid communication with the inlet of the input pipeline 24 of the metering system, and the second tank 4 that is in fluid communication with the inlet of the output pipeline 25 of the metering system. The water tank 7, the mass flow meter 27 installed on the input pipeline, the pump body 10 installed on the output pipeline 25, and the computer 28 for displaying the measurement results of the mass flow meter 27 and the mass flow meter 8 of the metering system. In this test system, the first water tank 4 and the second water tank 7 that can weigh the weight are used to ship and store the tank respectively, and a mass flow meter with the same type as the mass flow meter 6 of the metering system 8 is installed on the input pipeline 24 27. Use the 485 communication port to USB interface to connect the 485 communication port on the transmitter of the mass flow meters 6 and 27 to the USB interface of the computer 28 . In this way, the computer 28 and the mass flowmeters 6 and 27 are communicated in real time by using the Prolink program through the 485 communication method, and the computer 28 automatically records the various parameters measured by the mass flowmeter according to the set frequency, so as to facilitate the synthesis of various parameters Analyze and intuitively judge the performance of the metering system 8 . In addition, set the mass flow unit as kg/h or ton/h.

Example 1:

For the mass flow meters 6 and 27 with D ₁ =50 mm (diameter of 50 mm), the design flow rate F _V of the test system is 50 cubic meters per hour, and the test medium is water. The inner diameter D2 of the cylinder of the housing of the degassing device ₃ is 0.5 meters, and the distance H1 from the top to the bottom of the housing ₃ of the degassing device is 1.68 meters; The first height difference (i.e. H ₂ ) between the heights of the first travel switch is 0.56 meters; the second height between the top of the housing 3 (i.e. the entrance of the exhaust pipe 13) and the height of the second travel switch The difference (ie H ₃ ) is 0.31 meters.

The water in the first water tank 4 is pumped out by the pump body, enters the metering system 8 through the mass flow meter 27 , and then flows into the second water tank 7 . Use a weighing device with an accuracy of 0.05 (such as a weighbridge) to measure the quality change of the water in the two tanks, which is similar to the ship inspection and hull inspection in the actual custody transfer of liquid chemical products, but the accuracy can reach 0.1. The accuracy of the metering system is measured by comparing the mass cumulative quantities measured by the mass flowmeters 6 and 27 . In the process of pumping water, the inlet of the input pipe 24 in the first tank 4 can be raised several times to partially leave the water surface, so that the air is sucked into the input pipe together with the water. When the liquid level of the first water tank 4 drops and approaches the bottom, a large amount of gas will also enter the input pipe 24, and the instantaneous content of air in the water is 0% to 100%. Similarly, during the process of transporting refined oil from the ship 2 to the storage tank 9, air will also enter the input pipeline along with the liquid refined oil, especially when the liquid level of each cabin drops to the bottom and enters the storage stage, it will A large amount of gas or even 100% gas is sucked into the pipeline by the pump, which is also the reason why the measurement accuracy of the mass flowmeter is affected by the gas-liquid two-phase in the current custody transfer process. Through the metering system processing of the embodiment of the present invention, the gas with a content of 0% to 100% in the fluid can be eliminated, and the working condition required for accurate metering by the mass flowmeter can be achieved. After the water in the first water tank 4 li is nearly pumped out, the input pipeline can be placed on the second water tank 7, and the output pipeline 25 is placed on the first water tank 4 to continue the test. This is repeated many times, similar to the process of multi-warehouse delivery and multiple warehouse receipts in the process of ships delivering goods to storage tanks.

After each pumping is completed, the displays of the two weighing devices for the first tank and the second tank are turned on, the output pipeline 25 and the input pipeline 24 are withdrawn from the corresponding tank, and the weight of the water in the two tanks 4 is recorded. Repeat the above test process for many times until the whole test process is finished at any time, calculate the increase of each water tank is the amount of water discharged each time, and then add all of them together to get the cumulative weight of all the water discharged. At the same time, the cumulative amounts of the mass flowmeter 6 and the mass flowmeter 27 displayed by the computer 28 are read.

The results of the first test are shown in Table 1 below:

Table 1

The results of the second test are shown in Table 2 below:

Table 2

The results of the third test are shown in Table 3 below:

table 3

Three tests show that when the gas-containing water is not treated by the metering system 8, the error rate of the cumulative amount measured by the mass flowmeter 27 is relatively large, and the gas contained in the water affects the measurement accuracy of the mass flowmeter. Compared with the error rate of flowmeter mass 27 relative to weighing equipment, the error rate of flowmeter mass 6 relative to weighing equipment has dropped significantly, and its error rate has dropped to significantly lower than the international default acceptable error rate of 0.3%. , the accuracy can reach 1‰.

Example 2:

For mass flowmeters 6 and 27 of D ₁ =100 (caliber is 100 mm), the design flow rate F _V of the test system is 250 cubic meters per hour; the inner diameter D ₂ of the cylinder of the housing of the degassing device 3 is 1.26 meters; The distance H1 from the top to the bottom of the housing ₃ of the degassing device is 2.66 meters _; ) is 0.45 meters; the second height difference (ie H ₃ ) between the top of the housing 3 (ie the inlet of the exhaust pipe 13 ) and the height of the second travel switch is 0.25 meters.

Example 3

For D ₌ 150 (caliber is 150 mm) mass flowmeter, the design flow F _V of the test system is 500 cubic meters per hour; the inner diameter D of the cylinder of the housing of the degassing device ₃ is 1.69 meters; The distance H ₁ from the top to the bottom of the housing 3 is 3.14 meters; the first height difference (ie H ₂ ) between the lowest end of the inlet 251 of the output pipe 25 in the housing and the height of the first travel switch is 0.5 m; the second height difference (ie H ₃ ) between the top of the housing 3 (ie the inlet of the exhaust pipe 13 ) and the height of the second travel switch is 0.28 meters.

An embodiment of a further aspect of the present invention provides an air eliminator 3 comprising a substantially cylindrical closed housing 31 , an inlet pipe 24 and an outlet pipe 25 , eg made of stainless steel material. The input pipe 24 extends from the outside of the housing 31 to the inside of the housing 31, and the end of the input pipe 24 positioned at the inside of the housing 31 is formed into a substantially arc-shaped portion 241, so that the fluid flowing into the housing 31 through the input pipe 24 is subjected to Driven to form a vortex to promote the separation of gas and liquid in the fluid, and the separated gas accumulates in the upper part of the housing 31 , while the liquid part remains in the lower part of the housing 31 . The output pipe 25 extends from the outside of the housing 31 to the inside of the housing 31 at the lower part of the input pipe 24 to discharge the liquid in the fluid in the housing 31 .

The degassing device and metering system according to the embodiment of the present invention can measure the instantaneous mass flow rate, and the mass accumulation amount at any time period from the start of metering to the end of the process, with an accuracy of up to 1‰. Based on the metering system of the present invention, a new custody transfer scheme for refined oil products can be established, that is, the custody transfer is carried out based on the cumulative mass of the liquid measured by the metering system of the embodiment of the present invention, which can greatly reduce the trade of liquid petrochemical products Quantity disputes in the handover method can avoid huge costs due to commodity inspection and warehouse capacity calibration, shorten the time of each trade handover, and improve the operational efficiency of the petrochemical logistics industry.

Those skilled in the art can understand that the above-described embodiments are exemplary, and those skilled in the art can improve them, and the structures described in various embodiments do not conflict with each other in terms of structure or principle Under the circumstances, free combination can be carried out, so that on the basis of solving the technical problem of the present invention, more cooling systems and cooling methods for the containment of nuclear power plants can be realized.

After describing the preferred embodiments of the present invention in detail, those skilled in the art can clearly understand that various changes and changes can be made without departing from the scope and spirit of the appended claims, and the present invention is not limited by Implementation is limited to the exemplary embodiments set forth in the specification. It should be noted that the word "comprising" does not exclude other elements or steps, and the word "a" or "an" does not exclude a plurality. Furthermore, any element references in the claims should not be construed as limiting the scope of the invention.

Claims (15)

1. a device of cooling down (3), including:

The housing (31) of the closing of general cylindrical shape；

Input channel (24), the inside of described housing is extended to from the outside of described housing, the curved portions (241) that the end being positioned at described enclosure interior of described input channel is shaped generally as, the fluid in described input channel flows into described housing is made to form whirlpool, to promote the gas in described fluid to separate with liquid, and separated gas accumulates in the top of described housing；

Output channel (25), extends to the inside of described housing in the bottom of described input channel from the outside of described housing, to discharge the liquid in the fluid in described housing.

Cool down the most as claimed in claim 1 device, also include:

The screen cloth of general cylindrical shape, be arranged on described enclosure interior and and the inwall of described housing between there is preset distance, described screen cloth is roughly the same with the height of the column part of described housing.

Cooling down the most as claimed in claim 1 or 2 device, wherein, the liquid level that described curved portions is disposed relative to described fluid is downward-sloping.

Cooling down the most as claimed in claim 1 or 2 device, wherein, described curved portions place diameter of a circle is 3-4 times of the internal diameter of described input channel.

Cooling down the most as claimed in claim 2 device, wherein, described screen cloth includes:

Epimere, at described epimere, every square metre has 1500-2500 the first sieve aperture, and the aperture of each first sieve aperture is 15-20 millimeter；

Interlude, at described interlude, every square has 3000-5000 the second sieve aperture, and the hole of each second sieve aperture is 10-15 millimeter；And

Hypomere, at described hypomere, every square metre has 2000-4000 the 3rd sieve aperture, and the aperture of each 3rd sieve aperture is 10-15 millimeter；

Or, described screen cloth includes:

Epimere, at described epimere, every square metre has 3000-5000 the first sieve aperture, and the aperture of each first sieve aperture is 10-15 millimeter；

Interlude, at described interlude, every square has 4000-6000 the second sieve aperture, and the hole of each second sieve aperture is 5-10 millimeter；And

Hypomere, at described hypomere, every square metre has 6000-20000 the 3rd sieve aperture, and the aperture of each 3rd sieve aperture is 5-10 millimeter.

Cooling down the most as claimed in claim 2 device, wherein, be provided with liquidometer (17) between described screen cloth and housing, be provided with air bleeding valve (19) at the top of described housing, described air bleeding valve is opened according to the measurement result of displacement meter or is closed.

7. a metering system, including:

Device of cooling down as described in any one in claim 1-5；And

Mass flowmenter, be arranged in the hull outside of device of cooling down described in cool down device output channel on, the internal diameter D of described housing₂Determined by equation below:

Wherein, C₁It is the first matching factor, C₁Span be 1.7-1.9, η₁It is the kinematic coefficient of viscosity of water, η₂It is the kinematic coefficient of viscosity of liquid component, D in fluid₁For the inlet inside diameter of mass flowmenter, Fv is the design discharge of mass flowmenter.

8. metering system as claimed in claim 7, wherein, described first matching factor is 1.75-1.85, preferably 1.8.

9. metering system as claimed in claim 7, wherein, liquidometer (17) it is provided with between described screen cloth and housing, air bleeding valve (19) it is provided with at the top of described housing, described output channel is provided with regulation valve (23), described air bleeding valve and regulation valve open according to the measurement result of displacement meter or close.

10. metering system as claimed in claim 9, wherein, described housing the first height H from bottom to top₁Determined by equation below:

Wherein, C₂It is the second matching factor, C₂Span be 3.8-4.2, preferably 4.

11. metering systems as described in claim 9 or 10, wherein, farther include control system, when the first difference in height from the entrance of described output channel to the liquid level measured by described liquidometer is more than the second height H₂Time, described control system controls described regulation valve and is maintained at open mode, when described first difference in height is not more than the second height H₂Time, described control system controls described regulation valve and is maintained at closed mode,

Described second height H2 is determined by equation below:

Wherein, C₃It is the 3rd matching factor, C₃Span be 0.8-1.2, preferably 1.

12. metering systems as claimed in claim 11, wherein, the second difference in height when the liquid level measured from described liquidometer to the top of described housing is less than or equal to third height H₃Time, described control system controls described air bleeding valve and is maintained at closed mode,

Described third height H₃Determined by equation below:

Wherein, C₄It is the 4th matching factor, C₄Span be 1.5-2.1, preferably 1.8.

13. metering systems as described in any one in claim 7-12, wherein, mass flow is calculated as coriolis flowmeter.

14. metering systems as described in any one in claim 7-12, wherein, are provided with evacuated tube, described evacuated tube are provided with exhaust-valve (141) in the bottom of described housing.

15. metering systems as claimed in claim 12, wherein, described liquidometer includes the ball float (17) rising with liquid level or declining, and is provided with the first corresponding with the second height and third height respectively travel switch and the second travel switch on the housing

Described ball float regulates the switching of valve with the triggering that coordinates of described first travel switch, and described ball float coordinates triggering exhaust valve closure with described second travel switch.