Calibration and bell jar verification system for wet gas flow meters based on standard instrument combination

Abstract

This utility model discloses a calibration and bell-jar verification system for a wet gas flow meter based on a standard device combination, relating to the field of gas flow measurement technology. The bell-jar type gas flow standard device and the gas-liquid dual-purpose standard metal measuring vessel are sequentially connected by a first solenoid valve, a pressure sensor, a first temperature sensor, a wet gas flow meter, a flow regulating valve, and a fourth solenoid valve. The wet gas flow meter has a branch circuit. The inlet end of the gas-liquid dual-purpose standard metal measuring vessel is connected to a water tank via a pipeline. The outlet end of the gas-liquid dual-purpose standard metal measuring vessel is equipped with a drain valve and a three-way valve. The three-way valve is connected to a narrow-mouth bottle and the water tank via flexible conduits. An electronic balance is installed at the bottom of the narrow-mouth bottle. This utility model enables full-range calibration of the wet gas flow meter, calibration of the 0.2-grade standard wet gas flow meter, and verification and inspection of the bell-jar type gas flow standard device without disassembling the pipeline.

Description

Technical Field

[0001] This utility model relates to the field of gas flow measurement technology, specifically a wet gas flow meter calibration and bell jar verification system based on a combination of standard instruments. Background Technology

[0002] Existing calibration devices for wet gas flow meters have limitations: the flow range of the standard cannot cover the flow range of the wet gas flow meter under test. According to the JJF1357-2012 wet gas flow meter calibration specification, the main standard devices that can be selected are piston-type gas flow standard devices, bell-type gas flow standard devices, and sonic nozzle gas flow standard devices, and their flow range should be compatible with the wet gas flow meter being calibrated. Taking the existing bell-type gas flow device as an example, the minimum size of the bell is generally 20L, corresponding to a lower flow limit of 40L / h, while the lower flow limit of wet gas flow meters on the market is generally less than 10L / h, which obviously cannot meet the calibration requirements for small flow points. The lower flow limits of piston-type gas flow standard devices and sonic nozzle gas flow standard devices are also relatively high, and similarly cannot meet the requirements for small flow points.

[0003] The accuracy class of commonly used standards is insufficient to calibrate high-accuracy meters under test. According to the requirements of the calibration specifications, the expanded uncertainty of the standard should be better than half of that of the wet gas flow meter under test. Common bell-type gas flow standard devices and sonic nozzle gas flow standard devices cannot calibrate standard wet gas flow meters (0.2 class).

[0004] The equipment switching efficiency is low. When calibrating wet gas flow meters at minute flow points, the standard typically uses a small-sized gas-liquid dual-purpose standard metal measuring vessel or electronic balance, and performs calibration using the static volumetric method or weighing method. This means that different flow points require moving the meter under test, disassembling and reassembling the pipeline, re-preparing the calibration procedure, and is prone to introducing the risk of seal failure, resulting in a significant reduction in testing efficiency.

[0005] The cost of periodic verification and calibration of bell-type gas flow meters is high. The main standard instrument, the bell-type gas flow meter, requires regular verification and calibration. The static volumetric method using a gas-liquid dual-purpose standard metal measuring vessel is a common method for calibrating the bell-type gas flow meter. However, the initial setup and transportation of the standard instrument, piping, and temperature control of the water all require significant manpower and time, resulting in high costs. Furthermore, the calibration process disrupts routine testing and calibration tasks. Therefore, a wet gas flow meter calibration and bell-type gas flow meter verification system based on a combination of standard instruments is needed to solve these technical problems. Utility Model Content

[0006] In view of this, this utility model provides a wet gas flow meter calibration and bell jar verification system based on a combination of standard instruments. It solves the problems that the flow range of the standard instruments selected in the calibration specifications cannot cover the flow range of the wet gas flow meter under test, and cannot meet the calibration requirements of small flow points; the accuracy class of commonly used standard instruments is insufficient to calibrate high-precision meters under test (such as 0.2-grade meters); different flow points require disassembly and reassembly of pipelines to switch standard instruments, which leads to a significant reduction in operating efficiency and is prone to introducing the risk of seal failure; and the high cost of periodic verification and calibration of bell jar type gas standard devices.

[0007] To achieve the above objectives, the present invention adopts the following technical solution:

[0008] A calibration and bell-jar verification system for a wet gas flow meter based on a combination of standard instruments includes: a bell-jar type gas flow standard device and a gas-liquid dual-purpose standard metal measuring vessel. The bell-jar type gas flow standard device is connected to the gas-liquid dual-purpose standard metal measuring vessel via a pipeline. A first solenoid valve, a pressure sensor, a first temperature sensor, a wet gas flow meter, a flow regulating valve, and a fourth solenoid valve are sequentially connected between the bell-jar type gas flow standard device and the gas-liquid dual-purpose standard metal measuring vessel. The wet gas flow meter has a branch, on which a third solenoid valve is installed. The inlet end of the gas-liquid dual-purpose standard metal measuring vessel is connected to a water tank via a pipeline. The outlet end of the gas-liquid dual-purpose standard metal measuring vessel is equipped with a drain valve and a three-way valve. The three-way valve is connected to a narrow-mouth bottle and the water tank via flexible conduits. An electronic balance is installed at the bottom of the narrow-mouth bottle.

[0009] Furthermore, a first venting pipe is provided between the first solenoid valve and the pressure sensor, and a second solenoid valve is provided on the first venting pipe.

[0010] Furthermore, a second venting pipeline is provided between the flow regulating valve and the fourth solenoid valve, and a fifth solenoid valve is provided on the second venting pipeline.

[0011] Furthermore, a drain gate is provided between the outlet end of the gas-liquid dual-purpose standard metal measuring instrument and the three-way valve.

[0012] Furthermore, a sixth solenoid valve and a water pump are sequentially installed on the pipeline connecting the gas-liquid dual-purpose standard metal measuring instrument to the water tank.

[0013] Furthermore, a second temperature sensor is installed inside the water tank.

[0014] The beneficial effects of this utility model are as follows:

[0015] This utility model, through a combination of standard devices, enables the calibration of wet gas flow meters across the entire flow range and the periodic verification and calibration of bell-type gas standard devices without disassembling the pipeline. Specifically, it achieves the following four functions:

[0016] 1. Testing of the flow meter at regular flow points: When calibrating regular flow points (e.g., qmax, 0.7qmax, 0.2qmax), the bell-shaped gas flow standard device is used as the standard. The operation procedure is in accordance with the calibration specification. The bell-shaped gas flow standard device and the electronic balance are not involved in the calibration.

[0017] 2. Calibration of high-accuracy wet gas flow meters: When calibrating a 0.2-class wet gas flow meter, use a gas-liquid dual-purpose standard metal measuring instrument (better than Class II, with a maximum permissible error better than ±2.5×10-4) as the standard instrument.

[0018] 3. Calibration of wet gas flow meters at minute flow points (gravimetric method): When calibrating flow points less than 40 L / h, use the electronic balance at the back end as the standard, a gas-liquid dual-purpose standard metal measuring vessel as the water container, and a bell-type gas flow standard device to provide the gas source. The wet gas flow meter is calibrated using the gravimetric method, which can complete the calibration of minute flow points (0–40) L / h. If the minute flow point data is questionable, the same flow point can be tested a second time using the static volumetric method (using a metal measuring vessel) to verify consistency with the gravimetric method data.

[0019] 4. Verification and inspection of bell-type gas flow standard devices: Using a dual-purpose gas-liquid standard metal measuring instrument as the standard, the bell is calibrated according to the static volumetric method of JJG165-2024 Verification Procedure for Bell-Type Gas Flow Standard Devices, based on verification or traceability requirements. Equipment switching does not require disassembling pipelines; the bell calibration of the bell-type gas flow standard device can be completed within the system without affecting routine testing tasks. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the structure of this utility model;

[0022] In the figure:

[0023] 1- Bell-shaped gas flow standard device; 2- First solenoid valve; 3- Second solenoid valve; 4- Pressure sensor; 5- First temperature sensor; 6- Wet gas flow meter; 7- Third solenoid valve; 8- Flow regulating valve; 9- Narrow-mouth bottle; 10- Electronic balance; 11- Fourth solenoid valve; 12- Fifth solenoid valve; 13- Sixth solenoid valve; 14- Gas-liquid dual-purpose standard metal measuring instrument; 15- Water pump; 16- Discharge valve; 17- Three-way valve; 18- Water tank; 19- Second temperature sensor. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] Please see the appendix Figure 1 This utility model provides a wet gas flow meter calibration and bell jar verification system based on a combination of standard devices, including: a bell-shaped gas flow standard device 1 and a gas-liquid dual-purpose standard metal measuring instrument 14. The bell-shaped gas flow standard device 1 is connected to the gas-liquid dual-purpose standard metal measuring instrument 14 via a pipeline. A first solenoid valve 2, a pressure sensor 4, a first temperature sensor 5, a wet gas flow meter 6, a flow regulating valve 8, and a fourth solenoid valve 11 are sequentially connected between the bell-shaped gas flow standard device 1 and the gas-liquid dual-purpose standard metal measuring instrument 14. The wet gas flow meter 6 has a branch line with a third solenoid valve 7, which is used to bypass the wet gas flow meter 6 and directly connect to the bell-shaped gas flow meter 14 in bell jar verification mode. The gas flow standard device 1 has a gas-liquid dual-purpose standard metal measuring vessel 14 whose inlet end is connected to a water tank 18 via a pipeline. The outlet end of the gas-liquid dual-purpose standard metal measuring vessel 14 is equipped with a drain valve 16 and a three-way valve 17. The three-way valve 17 is connected to a narrow-mouth bottle 9 and the water tank 18 via flexible conduits. The narrow-mouth bottle 9 has a volume of 10L and is used to collect the water discharged from the bottom of the gas-liquid dual-purpose standard metal measuring vessel 14 when calibrating small flow points. An electronic balance 10 is installed at the bottom of the narrow-mouth bottle 9. The electronic balance 10 is used to weigh the water discharged from the bottom of the gas-liquid dual-purpose standard metal measuring vessel 14 into the narrow-mouth bottle 9. The accuracy of the electronic balance 10 is better than Class II, the maximum load capacity is 30kg, and the resolution d = 0.01g.

[0026] The gas-liquid dual-purpose standard metal measuring instrument 14 has an accuracy better than Class II. Its top overflow cover is sealed and equipped with a valve, and measuring necks are installed at both the top and bottom.

[0027] The bell-shaped gas flow standard device 1 has an accuracy class of 0.2, a nominal volume of ≥20L, and a working pressure of ≥10kPa.

[0028] Preferably, a first venting pipeline is provided between the first solenoid valve 2 and the pressure sensor 4, and a second solenoid valve 3 is provided on the first venting pipeline for venting gas from the pipeline.

[0029] Preferably, a second venting pipeline is provided between the flow regulating valve 8 and the fourth solenoid valve 11, and a fifth solenoid valve 12 is provided on the second venting pipeline for venting gas from the pipeline.

[0030] Preferably, a drain gate is also provided between the outlet end of the gas-liquid dual-purpose standard metal measuring instrument 14 and the three-way valve 17.

[0031] Preferably, a sixth solenoid valve 13 and a water pump 15 are sequentially installed on the pipeline connecting the gas-liquid dual-purpose standard metal measuring instrument 14 and the water tank 18.

[0032] All of the above solenoid valves can be replaced by ball valves, which are suitable for non-precision flow regulation scenarios.

[0033] Preferably, a second temperature sensor 19 is provided inside the water tank 18 for measuring the water temperature.

[0034] Calibration of the flow meter at regular flow points using a bell jar:

[0035] 1. According to the JJG1357-2012 flowmeter calibration specification, such as Figure 1 Connect the pipeline. The bell of the bell-type gas flow standard device 1 is raised and filled with gas. The second solenoid valve 3 and the third solenoid valve 7 are normally closed, and the fifth solenoid valve 12 is normally open for venting. After the flow meter 6 has undergone constant temperature, level adjustment, pre-run, and liquid level adjustment, the flow regulating valve 8 is opened and the opening degree is set according to the target flow point. The gas discharged from the bell of the bell-type gas flow standard device 1 passes sequentially through the first solenoid valve 2, pressure sensor 4, temperature sensor 5, flow meter 6, flow regulating valve 8, and fifth solenoid valve 12 before being discharged into the atmosphere. The calibration of all flow points is completed according to the calibration specifications.

[0036] 2. Calibration of high-accuracy flow meters using a standard metal measuring vessel (14-piece set) for both gas and liquid transport (static volumetric method):

[0037] After the flow meter 6 and the gas-liquid dual-purpose standard metal measuring vessel 14 have undergone temperature control and leveling adjustments, the first solenoid valve 2 and the third solenoid valve 7 are normally closed, while the fourth solenoid valve 11 and the fifth solenoid valve 12 are all open. The bottom drain valve 16 of the gas-liquid dual-purpose standard metal measuring vessel 14 is closed, and the water pump 15 is running to fill the gas-liquid dual-purpose standard metal measuring vessel 14 with water up to the upper measuring neck mark. The fourth solenoid valve 11 and the fifth solenoid valve 12 are closed, the second solenoid valve 3 is opened, and the flow regulating valve 8 is opened with its opening degree set according to the target flow point. Calibration begins. The initial gas volume value of the flow meter 6 is recorded. The bottom drain valve 16 is opened, and the three-way valve 17 directs water to the water tank 18. The flow meter 6 operates as the water inside the gas-liquid dual-purpose standard metal measuring vessel 14 is discharged. When the water level in the gas-liquid dual-purpose standard metal measuring vessel 14 drops to the lower measuring neck mark, the solenoid valve 16 is closed, the final gas volume of the flow meter 6 is recorded, and one calibration is completed. Repeat the above steps to complete the calibration of all flow points of the high-accuracy flow meter.

[0038] 3. Calibrate the flow meter at minute flow points using an electronic balance (weighing method):

[0039] The fourth solenoid valve 11, the fifth solenoid valve 12, and the sixth solenoid valve 13 are all open. The bottom drain valve 16 of the dual-purpose gas-liquid standard metal measuring vessel 14 is closed. The water pump 15 runs, filling the dual-purpose gas-liquid standard metal measuring vessel 14 to the upper measuring neck. Then, the fifth solenoid valve 12 and the sixth solenoid valve 13 are closed. After the flow meter 6 has undergone temperature control, level adjustment, pre-run, and liquid level adjustment, the flow regulating valve 8 is opened, and the opening degree is set according to the target flow point. The electronic balance 10 is used to tare the liquid. The bell-shaped gas flow standard device 1 is raised and filled with gas. The first solenoid valve 2 is opened, while the bypass third solenoid valve 7 is normally closed. The gas discharged from the bell-shaped gas flow standard device 1 passes sequentially through the first solenoid valve 2, pressure sensor 4, temperature sensor 5, flow meter 6, flow regulating valve 8, and fourth solenoid valve 11 before being discharged into the gas-liquid dual-purpose standard metal measuring vessel 14. The three-way valve 17 and connecting silicone tube guide the gas-liquid dual-purpose standard metal measuring vessel 14 to the narrow-mouth bottle 9, with the tube opening 5cm from the bottom of the bottle to avoid weighing errors caused by water flow impact. After weighing the water using an electronic balance 10, the water temperature and density are measured using an external standard density meter (or a built-in density sensor) to calculate the standard gas volume. The calibration data is recorded and processed, and the above steps are repeated to complete the calibration of the flow meter at a small flow point. If the small flow data is questionable, the same flow point can be tested again by switching to the static volumetric method (as described in step 2 above) to verify consistency with the weighing method data.

[0040] 4. Verification and inspection of the bell jar (static volume method):

[0041] According to the verification procedure of JJG65-2024 for bell-type gas flow standard devices, the fourth solenoid valve 11, the fifth solenoid valve 12, and the sixth solenoid valve 13 are all open, the bottom drain valve 16 of the gas-liquid dual-purpose standard metal measuring vessel 14 is closed, the water pump 15 is running, and water is added to the gas-liquid dual-purpose standard metal measuring vessel 14 to the upper measuring neck mark. The fifth solenoid valve 12 and the sixth solenoid valve 13 are closed, and the third solenoid valve 7 and the fourth solenoid valve 11 are open. At this time, the bell of the bell-type gas flow standard device 1 and the gas-liquid dual-purpose standard metal measuring vessel 14 are directly connected by pipeline. After the temperature, pressure, and sealing meet the requirements, the calibration begins. Open the bottom drain valve 16, and the water inside the dual-purpose gas-liquid standard metal measuring vessel 14 is discharged into the water tank 18 via the three-way valve 17. The bell of the bell-type gas flow standard device 1 then descends. When the water level in the dual-purpose gas-liquid standard metal measuring vessel 14 drops to the lower mark, sequentially close the solenoid valve 16 and the third solenoid valve 7. Repeat the above steps until the upper limit of this calibration section is reached. Read the height of the bell's descent from the scale to complete the first calibration. Record the data and repeat the steps of the first calibration to complete the calibration of the bell. The verification procedure is the same as the calibration procedure.

[0042] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A wet gas flowmeter calibration and bell prover system based on a combination of standards, characterized by, include: A bell-shaped gas flow standard device (1) and a gas-liquid dual-purpose standard metal measuring vessel (14) are provided. The bell-shaped gas flow standard device (1) is connected to the gas-liquid dual-purpose standard metal measuring vessel (14) via a pipeline. A first solenoid valve (2), a pressure sensor (4), a first temperature sensor (5), a wet gas flow meter (6), a flow regulating valve (8), and a fourth solenoid valve (11) are also connected in sequence between the bell-shaped gas flow standard device (1) and the gas-liquid dual-purpose standard metal measuring vessel (14). The wet gas flow meter (6) is provided with a branch, and a third solenoid valve (7) is provided on the branch. The inlet end of the gas-liquid dual-purpose standard metal measuring instrument (14) is connected to the water tank (18) through a pipeline. The outlet end of the gas-liquid dual-purpose standard metal measuring instrument (14) is provided with a liquid discharge valve (16) and a three-way valve (17). The three-way valve (17) is connected to the narrow-mouth bottle (9) and the water tank (18) respectively through a flexible conduit. An electronic balance (10) is provided at the bottom of the narrow-mouth bottle (9).

2. The primary standard combination based wet gas flow meter calibration and bell prover verification system of claim 1, wherein, A first venting pipe is provided between the first solenoid valve (2) and the pressure sensor (4), and a second solenoid valve (3) is provided on the first venting pipe.

3. The primary standard combination based wet gas flow meter calibration and bell prover verification system of claim 1, wherein, A second venting pipeline is provided between the flow regulating valve (8) and the fourth solenoid valve (11), and a fifth solenoid valve (12) is provided on the second venting pipeline.

4. The primary standard combination based wet gas flow meter calibration and bell prover verification system of claim 1, wherein, A drain gate is also provided between the outlet end of the gas-liquid dual-purpose standard metal measuring instrument (14) and the three-way valve (17).

5. The primary standard combination wet gas flow meter calibration and bell prover verification system of claim 1, wherein, The sixth solenoid valve (13) and the water pump (15) are sequentially installed on the pipeline connecting the gas-liquid dual-purpose standard metal measuring instrument (14) and the water tank (18).

6. The primary standard combination wet gas flow meter calibration and bell prover verification system of claim 1, wherein, A second temperature sensor (19) is installed inside the water tank (18).

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