A volumetric flowmeter based on air floatation separation and working method

Abstract

The application provides a volumetric flowmeter based on air floatation separation and a working method, comprising a mixing mechanism, a shearing mechanism, a sedimentation chamber and a measuring mechanism, the flowmeter is installed on a petroleum / liquefied natural gas pipeline, the mixing mechanism has a fluid inlet and a gas nozzle, the gas nozzle is used for gas injection, the mixing mechanism is used for mixing the gas and the liquid, the mixing mechanism outlet is communicated with the shearing mechanism, a shearing turbine is installed in the shearing mechanism, the shearing turbine produces shearing force on the mixed fluid through rotation and refines the bubbles, so that the bubbles are combined with solid particles, the shearing mechanism outlet is communicated with the sedimentation chamber, the combination of the solid particles and the bubbles is separated by rising in the sedimentation chamber, the sedimentation chamber outlet is communicated with the measuring mechanism, a measuring turbine is installed in the measuring mechanism, the measuring turbine is connected with a sensor, the sensor is used for measuring the turbine rotating speed, so that the fluid flow is indirectly obtained. The application ensures that the solid particle content in the fluid entering the measuring turbine is as low as possible.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of flow meters, and particularly relates to a volumetric flow meter based on air floatation separation and a working method. BACKGROUND

[0002] In the industrial fields of petroleum, chemical industry, etc., the fluid often contains a certain amount of solid particles. These solid particles can cause various adverse effects on the flow meter, such as reducing the measurement accuracy, damaging the internal structure of the flow meter, etc. The traditional flow meter usually faces the problems of accuracy reduction and service life shortening when dealing with solid-containing fluid.

[0003] The utility model discloses a gas floatation machine equipment, including gas floatation pool, the gas floatation pool bottom left side verticality is provided with the blowdown, the gas floatation pool top board covers the top board, the gas floatation pool left side upper portion is fixedly connected with the flow guide pipe, the top board left and right sides are all vertical downward fixedly connected with push rod motor, the gas floatation pool inside upper level is provided with the bubble collecting plate. The utility model discloses a follow-up pipe and gas conveying aluminum pipe are installed in cooperation, the follow-up pipe rotates, and the gas conveying aluminum pipe is installed in cooperation, the follow-up pipe rotates, and the gas conveying aluminum pipe can also carry out gas conveying, the stirring rod on the follow-up pipe can not only stir the sewage in the gas floatation pool, but also can avoid the problem that the particulate matter above the ring type aeration pipe is attached on the ring type aeration pipe and causes the aeration hole to be blocked.

[0004] A gas floatation machine equipment discloses a scheme for wrapping the particulate matter in sewage with gas bubbles and floating up, but the scheme is used in sewage treatment. However, due to the different particle sizes of the particulate matter, even if the number of gas bubbles is large, the gas bubbles cannot wrap the particulate matter with large particle sizes and float up. Moreover, the floating up of the particulate matter wrapped by the gas bubbles is a random probability time, and the particulate matter cannot be removed as much as possible. SUMMARY

[0005] The present application aims to solve the defects in the prior art, and provides a volumetric flow meter based on air floatation separation and a working method, which solves the influence of solid-containing fluid on the accuracy and service life of the flow meter, and especially realizes the controllable separation of the combination at multiple points through the innovative design of the settling chamber separation plate, thereby improving the adaptability to fluid with different particle properties.

[0006] The present application adopts the following technical scheme:

[0007] A volumetric flowmeter based on gas floatation separation, comprising a mixing mechanism, a shearing mechanism, a settling chamber and a measuring mechanism. The flowmeter is installed on a petroleum / liquefied natural gas pipeline, the mixing mechanism has a fluid inlet and a gas nozzle for injecting gas, and is used for mixing the gas and the liquid. The mixing mechanism outlet is communicated with the shearing mechanism, a shearing turbine is installed in the shearing mechanism, and the shearing turbine produces shearing force on the mixed fluid to refine the gas bubbles and promote the combination of the solid particles and the gas bubbles. The shearing mechanism outlet is communicated with the settling chamber, and the combination of the solid particles and the gas bubbles is separated by rising in the settling chamber. The settling chamber outlet is communicated with the measuring mechanism, and a measuring turbine is installed in the measuring mechanism. The measuring turbine is connected with a sensor, and the sensor is used for measuring the turbine speed to indirectly obtain the fluid flow.

[0008] Further, the gas nozzle of the mixing mechanism is connected with a gas injection system, the gas injection system comprises a gas storage tank, a pressure regulator and a gas injection nozzle, the gas storage tank is connected with the gas injection nozzle through a pipeline, and the pressure regulator is installed on the pipeline.

[0009] Further, a separation plate I is installed at the inlet of the settling chamber, the separation plate I is tightly attached to the inlet of the settling chamber, the separation plate I adopts a porous plate or a flat plate structure with slits, and the apertures or slits are 0.5-5 mm.

[0010] The separation plate II, the separation plate III and the separation plate IV are distributed at different heights in the settling chamber, the separation plate II, the separation plate III and the separation plate IV adopt a flat plate structure, and the surfaces thereof are roughened or coated with a hydrophilic coating. The height difference between the separation plate II and the separation plate III and between the separation plate III and the separation plate IV is 10-50 cm.

[0011] The separation plate V is an arc-shaped structure, can maximize the interception of solid particles, and has a thickness of 5-15 mm. The separation plate V is fixed on the outlet wall of the settling chamber by welding or bolting, and the two ends of the separation plate V are connected with flow guides.

[0012] Further, a flow guide plate is further installed on the separation plate I along the flow direction.

[0013] A working method of a volumetric flowmeter based on gas floatation separation, comprising:

[0014] Step 1. When the solid-containing fluid enters the flowmeter, the gas is injected into the fluid by the gas injection system, and the mixing of the gas and the liquid is realized in the mixing mechanism.

[0015] Step 2. The mixed fluid enters the shearing mechanism, the shearing turbine produces shearing force on the mixed fluid to refine the gas bubbles and promote the combination of the solid particles and the gas bubbles.

[0016] Step 3. The fluid enters the settling chamber, and the settling separation is performed in the settling chamber, and the combination of the solid particles and the gas bubbles rises to the surface of the fluid.

[0017] Step 4: The fluid separated by sedimentation continues to drive the measuring turbine in the measuring mechanism, and the sensor measures the measurement of the measuring turbine to obtain an accurate measurement value.

[0018] Further, in step 3, the separation plate I is used to separate particles with larger particle size, heavier mass and not easily wrapped and lifted by bubbles, the separation plate II, the separation plate III and the separation plate IV are used to separate the combination with small density and large particle size to the combination with large density and small particle size, and the separation plate V intercepts the residual solid particles and simultaneously performs flow regulation and buffering on the fluid.

[0019] The beneficial effects of the present application are:

[0020] 1. The present application improves the measurement accuracy. The present application effectively reduces the influence of solid particles on the flowmeter through air floatation separation and special measuring turbine, and improves the measurement accuracy.

[0021] 2. The present application reduces solid phase damage. The present application reduces the wear and damage of solid particles to the internal structure of the flowmeter through solid phase degradation mechanism, and prolongs the service life of the flowmeter.

[0022] 3. The present application has strong adaptability. The present application is suitable for the measurement of various solid-containing fluids, and can be adjusted and optimized according to different fluid properties and flow ranges.

[0023] 4. The present application can realize multi-site controllable separation of particulate matter. The unique separation plate design in the sedimentation chamber can effectively separate the solid particle and bubble combination at different positions according to different particle properties, improve the separation efficiency and controllability, and ensure the stable operation of the flowmeter under complex working conditions. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is a structure schematic diagram of the volumetric flowmeter based on air floatation separation of the present application.

[0025] Figure 2 It is a structure schematic diagram of the air floatation separation multi-site controllable structure in the sedimentation chamber of the present application.

[0026] Figure 3 It is a structure schematic diagram of the separation plate I.

[0027] Figure 4 It is a structure schematic diagram of the separation plate II, the separation plate III and the separation plate IV.

[0028] Figure 5 It is a structure schematic diagram of the separation plate V.

[0029] Figure 6 It is a structure schematic diagram of the gas injection system.

[0030] In the figure:

[0031] 1 - mixing mechanism, 2 - shearing mechanism, 3 - settling chamber, 4 - measuring mechanism, 5 - gas injection system;

[0032] 201 - shearing turbine;

[0033] 301 - separation plate I, 302 - guide plate, 303 - separation plate II, 304 - separation plate III, 305 - separation plate IV, 306 - separation plate V;

[0034] 401 - sensor, 402 - measuring turbine;

[0035] 501 - gas storage tank, 502 - pressure regulator, 503 - gas injection nozzle. DETAILED DESCRIPTION

[0036] In order to make the purpose, technical solutions and advantages of the present application clearer, the technical solutions in the present application are described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0037] Working principle of the present application:

[0038] 1. Bubble adsorption and carrying: In the process of mixing, shearing and settling, bubbles adsorb solid particles and carry them to the surface of the fluid. With the rupture of the bubbles, the solid particles are separated out, thereby realizing solid phase degradation.

[0039] 2. Continuous shearing effect of shearing turbine: The continuous rotation of the shearing turbine produces a continuous shearing force on the fluid, further promoting the combination of solid particles and bubbles, and making larger solid particles force smaller particles, which are convenient to be adsorbed and carried by bubbles.

[0040] 3. Different treatment methods according to particle size in the settling chamber: Based on the characteristic differences of the solid particle and bubble combination in the settling process, layered separation is realized. For the combination with small density and large particle size, due to the relatively large buoyancy it receives, the rising speed is relatively fast, and it will be intercepted at the relatively high position of the separation plate (such as separation plate II); while the combination with large density and small particle size has a slow rising speed, and will be separated at a relatively low position (such as separation plate IV).

[0041] For example, Figure 1As shown, a volumetric flowmeter based on gas floatation separation of the present application comprises a mixing mechanism 1, a shearing mechanism 2, a settling chamber 3 and a measuring mechanism 4. The flowmeter is installed on a petroleum / liquefied natural gas pipeline, the mixing mechanism 1 has a fluid inlet and a gas nozzle for injecting gas to mix gas and liquid. The mixing mechanism outlet is connected to the shearing mechanism 2, which is provided with a shearing turbine 201 to generate shearing force on the mixed fluid by rotation and to refine gas bubbles to better combine gas bubbles with solid particles. The shearing mechanism 2 outlet is connected to the settling chamber 3, where the sheared fluid is subjected to settling separation. The settling chamber 3 is optimally designed in shape and size to promote the rising separation of the combination of solid particles and gas bubbles. The settling chamber 3 outlet is connected to the measuring mechanism 4, which is provided with a measuring turbine 402 connected to a sensor 401. The sensor 401 is a high-precision sensor capable of accurately measuring the rotational speed of the turbine to indirectly obtain the fluid flow. The design of the measuring turbine 402 mainly considers the accurate measurement of fluid flow, and the structure is more precise to ensure the accuracy and stability of the measurement.

[0042] Further, as shown in Figure 6 The gas nozzle of the mixing mechanism 1 is connected to a gas injection system 5, which comprises a gas storage tank 501, a pressure regulator 502 and a gas injection nozzle 503. The gas storage tank 501 is connected to the gas injection nozzle 503 by a pipeline, and the pipeline is provided with the pressure regulator 502. The gas storage tank 501 is used to store compressed air such as air or nitrogen. The pressure regulator 502 can adjust the injection pressure of the gas according to the properties and flow of the fluid, and the gas injection nozzle 503 is used to inject compressed gas into the fluid in a small and uniform state to fully mix the gas and liquid.

[0043] Further, the blade shape and angle of the shearing turbine 201 are specially designed to optimize the shearing effect.

[0044] Further, as shown in Figure 3 The separation plate I 301 is installed at the inlet of the settling chamber 3, and the separation plate I 301 adopts a multi-hole plate or a flat plate structure with slits. The size of the holes or slits is designed to be between 0.5-5mm according to the particle size distribution of the total solid particles in the fluid. The separation plate I 301 is tightly fitted with the inlet of the settling chamber 3 and can be fixed by welding, bolt connection or slot embedding. The separation plate I 301 mainly intercepts the combination of large-size solid particles and gas bubbles, and at the same time, it straightens the fluid to make it enter the settling chamber 3 uniformly and stably. For particles with large particle size, heavy mass and not easy to be quickly wrapped and lifted by gas bubbles, the separation plate I 301 plays a role of preliminary screening and blocking to prevent them from directly impacting the subsequent separation structure and to ensure the stability of the subsequent separation process.

[0045] As shown in Figure 4As shown, the separation plate II 303, the separation plate III 304 and the separation plate IV 305 are distributed at different heights in the settling chamber 3, adopting a flat plate structure, and the surface is roughened or coated with a hydrophilic coating to enhance the separation effect. The distance between the separation plate II 303 and the separation plate III 304, and the distance between the separation plate III 304 and the separation plate IV 305 are determined to be between 10-50 cm according to the solid particle settling characteristics and the desired separation effect. The three separation plates are installed on the inner wall of the settling chamber 3 through a guide rail structure, which can realize left-right position adjustment and angle adjustment, as shown. Figure 2 Of course, an automatic control system can also be installed to monitor the fluid state in real time through pressure sensors and turbidity sensors, and automatically adjust the positions of the three separation plates.

[0046] The above three separation plates realize the separation of different particle sizes and density combinations based on the characteristic differences of the solid particle and bubble combination in the settling process. For the combination with small density and large particle size, it will be intercepted at the higher separation plate (such as the separation plate II 303) due to its faster rising speed, while the combination with larger density and smaller particle size will be separated at a relatively lower position (such as the separation plate IV 305), so the pore size of the separation plate II 303 is larger than that of the separation plate IV 305. The separation plate III 304 is between the separation plate II 303 and the separation plate IV 305, and its height position enables it to separate combinations with specific particle size and density range, which is between the characteristics of the combinations targeted by the separation plate II 303 and the separation plate IV 305. For example, for some combinations with intermediate particle size and density, they may be separated from the fluid body when they reach the position of the separation plate III 304 due to the obstruction of the separation plate III 304 and their own settling characteristics. In this way, precise separation can be achieved for different particle properties, improving the overall separation efficiency.

[0047] As shown in Figure 5 The separation plate V 306 is an arc-shaped structure, and the thickness of the separation plate V 306 is 5-15 mm. It is fixed on the outlet wall of the settling chamber 3 by welding or high-strength bolts, and the two ends of the separation plate V 306 are connected to the flow guide cover to guide the fluid to the center position of the measuring turbine 402. The separation plate V 306 serves as the last line of defense to protect the measuring turbine 402, intercepting residual solid particles, while also guiding and buffering the fluid, ensuring measurement accuracy and prolonging the service life of the measuring turbine 402.

[0048] Further, the separation plate I 301 is also provided with a flow guide plate 302 along the flow direction to guide the flow direction of the fluid and enhance the settling effect.

[0049] A working method of a volumetric flowmeter based on air flotation separation, comprising:

[0050] Step 1. When the solid-containing fluid (oil / liquefied natural gas) enters the flow meter, the gas is injected into the fluid through the gas injection system, and the mixing of the gas and the liquid is achieved in the mixing mechanism 1.

[0051] Step 2. The mixed fluid enters the shearing mechanism 2, and the shearing turbine 201 generates shear force on it, which refines the gas bubbles and promotes the combination of solid particles and gas bubbles.

[0052] Step 3. The fluid enters the settling chamber 3, and the settling separation is carried out in the settling chamber 3, and the solid particle and gas bubble combination rises to the surface of the fluid.

[0053] Step 4. The fluid after the settling separation continues to drive the measurement turbine 402 in the measurement mechanism 4 to rotate, and the sensor 401 measures the measurement result of the measurement turbine 402 to obtain an accurate measurement value.

[0054] Further, the shear force generated by the rotation of the shearing turbine in step 2 continuously promotes the degradation of the solid phase and reduces the influence of the solid particles on the flow meter.

[0055] Further, in step 3, the separation plate I 301 is used to separate the particles with large particle size, heavy mass and not easy to be quickly wrapped and lifted by the gas bubbles, the separation plate II 303, the separation plate III 304 and the separation plate IV 305 are used to separate the combination with small density and large particle size to the combination with large density and small particle size, and the separation plate V 306 intercepts the residual solid particles while buffering and straightening the fluid. The separation plates at different positions realize multi-point controllable separation according to the property differences of the solid particle and gas bubble combination, ensure that the solid particle content in the fluid entering the measurement turbine 402 is as low as possible, and improve the overall performance of the flow meter.

[0056] Embodiment

[0057] In a certain petrochemical pipeline, install the volume flowmeter based on gas floatation separation. First, according to the flow and fluid properties of the pipeline, adjust the pressure of the gas injection system 5 and the parameters of the gas injection nozzle 503 to ensure that the gas can be fully mixed with the liquid. When the solid-containing fluid enters the flowmeter, it passes through the mixing mechanism 1, the shearing mechanism 2, the settling chamber 3 and the measuring mechanism 4 in turn. In the settling chamber 3, each separation plate plays a role according to the design, realizing the multi-point controllable separation of solid particles. For example, for crude oil containing sand particles and impurities of different particle sizes, a part of the sand particles with larger particle sizes is intercepted by the separation plate I 301 at the inlet, and the impurities with smaller particle sizes are combined with gas bubbles and separated at different heights of the separation plate II 303, the separation plate III 304 and the separation plate IV 305 according to the gas density and the rising speed, and finally a small amount of residual particles are blocked at the separation plate V 306. In each link, the solid particles and the gas bubbles are continuously combined and separated, realizing the degradation of the solid phase. Compared with the traditional flowmeter, the service life of the flowmeter is also significantly prolonged due to the solid phase degradation mechanism after a period of operation.

[0058] Finally, it should be noted that: the above examples are only used to illustrate the technical solutions of the present application, and not to limit it; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

Claims

1. A positive displacement flowmeter based on gas float separation, characterized in that, The flow meter is installed on a petroleum / liquefied natural gas pipeline and comprises a mixing mechanism, a shearing mechanism, a settling chamber and a measuring mechanism, the mixing mechanism has a fluid inlet and a gas nozzle for gas injection, the mixing mechanism is used for mixing gas and liquid, the mixing mechanism outlet is communicated with the shearing mechanism, a shearing turbine is installed in the shearing mechanism, the shearing turbine produces shearing force on the mixed fluid by rotation and refines bubbles, so that the bubbles are combined with solid particles, the shearing mechanism outlet is communicated with the settling chamber, the combination of the solid particles and the bubbles is separated by rising in the settling chamber, and the settling chamber outlet is communicated with the measuring mechanism, a measuring turbine is installed in the measuring mechanism, the measuring turbine is connected with a sensor, the sensor is used for measuring the rotation speed of the measuring turbine, so that the fluid flow is indirectly obtained; The separation plate I is installed at the inlet of the settling chamber and tightly abuts against the inlet of the settling chamber, and the separation plate I adopts a porous plate or a flat plate structure with slits; The separation plate II, the separation plate III and the separation plate IV are distributed at different heights in the settling chamber, and the separation plate II, the separation plate III and the separation plate IV adopt a flat plate structure; the separation plate V is an arc-shaped structure, the separation plate V is fixed on the outlet wall of the settling chamber by welding or bolts, and the two ends of the separation plate V are connected with flow deflectors; The surfaces of the separation plate II, the separation plate III and the separation plate IV are roughened or coated with a hydrophilic coating, and the height difference between the separation plate II and the separation plate III and between the separation plate III and the separation plate IV is 10-50 cm.

2. The flow meter of claim 1, wherein, The gas nozzle of the mixing mechanism is connected with a gas injection nozzle of a gas injection system, the gas injection system comprises a gas storage tank, a pressure regulator and the gas injection nozzle, the gas storage tank is connected with the gas injection nozzle through a pipeline, and the pressure regulator is installed on the pipeline.

3. The flow meter of claim 1, wherein, The aperture or slit of the separation plate I is 0.5-5 mm.

4. The flow meter of claim 1, wherein, The thickness of the separation plate V is 5-15 mm.

5. The flow meter of claim 1, wherein, A flow guide plate is further installed on the separation plate I along the flow direction.

6. A method of operating a positive displacement flow meter based on the air floatation separation of any of claims 1-5, wherein, Comprise: Step 1. When the solid-containing fluid enters the flow meter, gas is injected into the fluid by the gas injection system, and the gas and the liquid are mixed in the mixing mechanism; Step 2. The mixed fluid enters the shearing mechanism, the shearing turbine produces shearing force on the fluid, refines the bubbles and promotes the combination of the solid particles and the bubbles; Step 3. The fluid enters the settling chamber, and the settling separation is performed in the settling chamber, and the combination of the solid particles and the bubbles rises to the surface of the fluid; Step 4. The fluid after the settling separation continues to drive the measuring turbine in the measuring mechanism to rotate, the sensor measures the measurement result of the measuring turbine, and an accurate measurement value is obtained.

7. The method of working according to claim 6, characterized in that, In step 3, the separation plate I is used for separating particles with large particle size, heavy mass and not easy to be quickly wrapped and lifted by bubbles, the separation plate II, the separation plate III and the separation plate IV are used for separating the combination of small density and large particle size to the combination of large density and small particle size, and the separation plate V intercepts the residual solid particles and simultaneously guides and buffers the fluid.

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