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Introduction to the use of gas flowmeters in daily life

The detailed application of gas lumbar flowmeter in daily life According to the introduction of vortex flowmeter experts: With the increase of natural gas exploration in China and the increasingly urgent urban environmental protection. Urban gasification has become the development trend of major and medium-sized cities across the country. Under the influence of the market economy, the measurement tasks in the city gas transmission and distribution indirectly affect the career and development of the gas management department, and also the main indicators of the tasks of these departments. Then, in the face of more than ten varieties and hundreds of varieties of gas flow meters at home and abroad, how to make a good measurement according to various physical properties, flow patterns, device requirements, environmental conditions, economics, etc. The premise and basics are also the immortal theme of the gas measurement departments and professional designers in each city. As a gas management department, we attach great importance to the measurement and free tasks of the jurisdiction. According to the actual working conditions, we chose to use the JLQ-ZC series intelligent gas waist flowmeter, which is consumed by Tianjin Xinke Complete Instrument Co., Ltd., as a volumetric flowmeter. The meter for the closed gas inspection of the community. This series of instruments not only has all the features of the volumetric flowmeter, but also the complete combination of its intelligent integration and localization makes the flowmeter obtain a wider range ratio without losing the measurement accuracy, and the gas volume of the residential area is shaken greatly. The dry tube metering is especially useful.
2. The principle and characteristics of the volumetric gas lumbar flowmeter:
2.1 The principle of the volumetric flowmeter:
The external design of the positive displacement flowmeter has a space for affirming the volume. The external flow of the flowmeter rotates under the pressure of the fluid flowing from the inlet. As the rotor rotates, the fluid flows from the inlet to the discharge port. During the course of the rotation, a positive volume space is created between the rotor and the flow meter housing, so that the fluid overflows the space and the fluid is always sent to the discharge port. If the volume of the space is designed and the number of revolutions of the rotor is measured, the volume given by the space can be obtained, thereby obtaining the volume of the fluid flowing. In addition, according to the number of rotations of the rotor measured per unit time, the instantaneous flow rate can be obtained, which is the measurement principle of the volumetric flowmeter.
Vortex flowmeter experts pointed out: With the increase of natural gas exploration in China and the increasingly eager urban environmental protection. Urban gasification has become the development trend of major and medium-sized cities across the country. Under the influence of the market economy, the measurement tasks in the city gas transmission and distribution indirectly affect the career and development of the gas management department, and also the main indicators of the tasks of these departments. Then, in the face of more than ten varieties and hundreds of varieties of gas flow meters at home and abroad, how to make a good measurement according to various physical properties, flow patterns, device requirements, environmental conditions, economics, etc. The premise and basics are also the immortal theme of the gas measurement departments and professional designers in each city. As a gas management department, we attach great importance to the measurement and free tasks of the jurisdiction. According to the actual working conditions, we chose to use the JLQ-ZC series intelligent gas waist flowmeter, which is consumed by Tianjin Xinke Complete Instrument Co., Ltd., as a volumetric flowmeter. The meter for the closed gas inspection of the community. This series of instruments not only has all the features of the volumetric flowmeter, but also the complete combination of its intelligent integration and localization makes the flowmeter obtain a wider range ratio without losing the measurement accuracy, and the gas volume of the residential area is shaken greatly. The dry tube metering is especially useful.
2. The principle and characteristics of the volumetric gas lumbar flowmeter:
2.1 The principle of the volumetric flowmeter:
The external design of the positive displacement flowmeter has a space for affirming the volume. The external flow of the flowmeter rotates under the pressure of the fluid flowing from the inlet. As the rotor rotates, the fluid flows from the inlet to the discharge port. During the course of the rotation, a positive volume space is created between the rotor and the flow meter housing, so that the fluid overflows the space and the fluid is always sent to the discharge port. If the volume of the space is designed and the number of revolutions of the rotor is measured, the volume given by the space can be obtained, thereby obtaining the volume of the fluid flowing. In addition, according to the number of rotations of the rotor measured per unit time, the instantaneous flow rate can be obtained, which is the measurement principle of the volumetric flowmeter.
3. JLQ-Z-C series intelligent gas waist flowmeter in the area of closed metering:
Vortex flowmeter expert comment: In order to cooperate with the mission to reduce the amount of civil gas to take the regional closed measurement, the small accounting unit is a feasible move. On the one hand, it can examine the task of the philanthropist in the cell through the difference between the total table and the sub-table of the community, and analyze the operation status of the external pipe network of the cell; on the other hand, it can control the air volume allocation state of all jurisdictions through data analysis, which is beneficial to Reasonably adjust the gas volume to protect residents' gas consumption.
Cell closed measurement characteristics:
1) With the absolute comparison of the gas peak and the low peak, the flow quality of the main pipe in the inlet zone is changed in a larger range, and the request summary has a wider range ratio.
2) The low peak gas flow rate of the gas is very small, sometimes only the gas consumption of several residents' stoves, and the requesting meter has a very low starting flow.
3) The residents use a wide range of barrier-type civil gas meters, which have high measurement accuracy under normal operating conditions, do not lose gas, and require high accuracy of metering.
4) After the main meter is installed in the pressure regulator, the indoor unit and the residential gas working conditions are basically the same. The meter and the meter are used to remove different types of flow meters because the gas component changes to the meter. Difference.
5) Flow meter innovation task. The limitations of the original process pipeline and device space are large.
The request list does not have a straight pipe request and a smart device method.
It is confirmed that the JLQ-Z-C series intelligent gas lumbar flowmeter is a volumetric flowmeter that satisfies the above request. However, special attention should be paid to the fact that the measured medium flowing through the volumetric flowmeter must maintain a certain degree of cleanliness, that is, the gas filter must be installed before the flowmeter, otherwise it will affect the normal operation of the positive displacement flowmeter and the reliable accuracy. .
Comprehensive innovation investment, the average degree of life and death of the residential community, the residential habits and astronomical status of the community, the scope of the community and many other factors, selected 1045 commodity residential quarters in Fengheyuan on the Keshi Street and the Rongxiang Xili 3736 located in Wangding Dike. Huping changed the residential area as the most representative pilot in the city. The temperament of Fengheyuan Community is a natural gas. According to the state of gas control, a JLQ-ZC-300 intelligent gas lumbar flowmeter is installed. The maximum working flow is 300m3/h, and the accuracy is ±1%. The ratio is 1:60. (ie 5 - 300m3 / h), Wuhan moved to start flow 3m3 / h, up and down the device, the front of the table is equipped with a gas filter. In the Xili district, the temperament is natural gas, and a JLQ-Z-C-450 intelligent gas lumbar flowmeter is installed according to the previously controlled gas state. The maximum working condition is 450m3/h, the accuracy is ±1%, the range ratio is 1:60 (ie 7.5-450m3/h), the starting flow is 4.5m3/h, the upper and lower outlets are installed, and the gas filter is installed in front of the table. Since the commissioning operation in May 2000, it has seen initial efficacy. Taking the report data from July 20, 2000 to August 20, 2000 as an example, the total gas supply of Fengheyuan Community is 8520m3, the sales volume is 7991.5m3, and the sales rate is 6.2%. The gas supply volume is 39,830 m3, the gas volume is 37,318.27 m3, and the sales rate is 6.31%. Compared with the same period of last year, the free rate has increased by about 10%. In addition, through this method, the closed metering is relatively correct, and the supply and sales rate of each closed cell is obtained, which lays a good foundation for the operation of the progressive community and the free governance. On the one hand, the "human feelings in stealing gas, leaking and free tasks" Gas can be invented and adopted in a timely manner to increase the economic loss of the gas management department. At the same time, it also provides a favorable monitoring tool for the safe gas supply task. On the other hand, it has a hard indicator for the task of the community gratis personnel. Enhanced mission obligations.
When there is a large area of the cell and the peak flow of the main pipe in the zone is high, it is necessary to co-ordinate the upper limit flow, and not to lose the gas volume when the flow is small, and the request for the total meter range ratio of the entry zone is invisibly improved. For example, if the maximum flow of the main pipe in a residential area is 600m3/h, and the minimum flow is 6m3/h, the flowmeter ratio of the position is 1:100, and the parameters of various flow meters are difficult to control. At that time, we were able to handle this problem by adopting two flow meter parallel devices. In the above state, two JLQ-ZC-300 intelligent gas lumbar flowmeter parallel devices (Fig. 4) are adopted. The flow rate of a single meter is 5-300m3/h. Accuracy ±1%. At the same time, the two tables are simultaneously put into use. Operation, the upper limit of measurement is 600m3/h, that is, it does not exceed the limit operation, and it can satisfy the measurement accuracy. When a low flow peak is used, a flow meter is closed, and the upper limit of the single operation is 5m3/h, which can satisfy the measurement request of the minimum flow. All of these changes can be achieved manually, and can also be actively implemented through electric valves and control circuits.
4. Vortex flowmeter expert assertions and initiatives
4.1 From the above example, the task principle and structure of the volumetric flowmeter are selected and compared with the gas waist flowmeter in the closed metering of urban residents. It works in conjunction with the intelligent integrated display to make this type of flow meter more perfect.
4.2 Select JLQ-ZA series temperature-compensation intelligent gas lumbar flowmeter under the condition of permitting conditions, and indirectly convert the working flow into the standard (20°C, 101.325Kpa) flow display storage will be given to the gas department's measurement task Bring greater inconvenience.

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