Analysis and method of gas supply measurement error in natural gas station

At present, there are various types of gas dispensers in use in China, and their functions are also different. If a new gas dispenser is inspected for natural gas, it should be verified at a small flow rate and used under a large flow rate. Basically no error will be caused. The measurement of gas supply from natural gas stations is the basis for gas handover measurement and peak shaving treatment in the West-East Gas Pipeline System. Strengthen the metering management of the gas supply in natural gas stations, run the large-flow metering instruments in parallel, reasonably control the gas flow rate, and ensure that the metering accuracy meets the design standards. Select and use the best gas flow meter to make the gas measurement of natural gas stations reach the best state, and promote the amount of long-distance pipeline gas transmission to achieve the most accurate degree. 1. Overview of natural gas measurement There are various types of natural gas transmission stations. According to their role in the West-East Gas Pipeline System, the tasks of receiving, measuring and transmitting natural gas are completed. Boosting, distributing, storing and peak-shaving the natural gas transported by the pipeline ensures that the gas volume transported by the entire pipeline system meets the needs of users. The selection and use of natural gas measuring instruments is the key. In order to ensure the accuracy of the measurement of the West-East Gas Pipeline System, the management of the measuring instruments should be strengthened. Select ultrasonic flowmeters, etc. to conduct online gas measurement to ensure that the amount of pipeline gas transmission meets the design standards of long-distance pipeline systems, and avoid excessive measurement errors and losses to natural gas production enterprises. 2. Gas supply metering in natural gas stations 2.1 Gas supply metering instrument The metering device that displays the measured value of natural gas is the metering instrument. Combined with the gas supply conditions of natural gas stations in the West-East Gas Transmission System, select the best metering instrument system to ensure that the measurement accuracy meets the design requirements, obtain accurate natural gas flow data information, and provide a basis for long-distance pipeline gas transmission. The use of differential pressure flowmeter, according to the pressure difference before and after the flow detection device installed in the pipeline, such as the application of standard orifice flowmeter, combined with the operating parameters of the pipeline, the state of the medium circulating in the pipeline and other data, calculate the flow rate in the pipeline. Flow data for natural gas. The volumetric flowmeter uses mechanical measuring components to divide the natural gas flowing through the meter into a certain volume interval, and measures the amount of gas supplied to the natural gas station according to the fixed volume and the number of times of gas entering per unit time. The velocity-type flow measuring instrument can directly measure the flow of natural gas in a closed pipeline, and obtain the flow data of natural gas according to the velocity of the natural gas passing through the flow measuring instrument. The gas turbine flowmeter is that when the gas passes through the turbine, the gas can push the impeller to rotate, and the magnetic induction signal passes through the action of the induction coil to generate a pulse signal, which is proportional to the flow rate and flow of the natural gas. equipment, transmit it, obtain accurate natural gas flow data and information, complete the gas supply measurement of the gas transmission station, and ensure that the quantity of gas supplied meets the requirements of the pipeline system. 2.2 Automation of gas supply metering at natural gas stations In order to improve the accuracy of gas supply metering in the West-East Gas Transmission System, the metering of the gas supply end of the entire gas transmission station is optimized, and an automated metering system is selected to ensure the accuracy of metering data. , to avoid excessive errors, which will affect the economics of enterprise production. Combined with the automation of the long-distance gas pipeline system, the automatic part of the natural gas flow measurement instrument is closely combined with the SCADA system, etc., through automatic control and adjustment, to ensure that the pipeline gas volume meets the needs of users. Peak shaving is performed on the long-distance gas pipeline system to avoid errors in measuring instruments, which will affect the accuracy of peak shaving and bring losses to the long-distance pipeline system. The flow transmitter is used to transmit the flow data of the natural gas in the pipeline in real time, so that the pipeline automatic control system can open or close the gas transmission valve system in real time, so as to ensure that the opening of the valve meets the actual needs. Combining all parts of the automatic control system, if a natural gas leakage accident occurs, close the gas valve immediately to avoid a large amount of natural gas leaking into the atmosphere, causing environmental pollution and harm to long-distance pipeline gas transmission. Error analysis and method discussion The main reason for the error caused by the natural gas flowmeter is that the gas filling volume meters are all volumetric flowmeters, and the biggest drawback of the volumetric flowmeter is the existence of leakage. With the long-term use of natural gas flowmeters , the leakage will become larger and larger, so that the flow-error curve drops sharply in the small flow range, resulting in a large error. When the flow rate is higher than the verified flow rate, there will be an error in the sky. The best way is to re-set up the return pipe to ensure the accuracy of the value.

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