Technical principles and functional implementation of Hongrun NHR-7630R in natural gas energy measurement

1. Abstract

As an available energy source, the core value of natural gas lies in the output of heat. The traditional volume measurement method for trade transfer pricing cannot reflect the advantages and disadvantages of natural gas with different qualities in terms of calorific value. Natural gas energy measurement for pricing and exchange of natural gas can better reflect fairness. NHR-7630R natural gas flow integrating controller/recorder flow controller is a device that mainly solves the problem of online measurement of natural gas flow in oil fields. It automatically converts the natural gas flow in the pipeline into the natural gas volume flow and accumulation under industrial standard conditions through compensation and calculation. Products designed to calculate and improve flow measurement accuracy. The product adopts a special design and has a total of thirteen "molar component coefficients" for selection and setting to meet the measurement of natural gas containing various components. At the same time, a variety of pressure measurement methods are set up to adapt to different measuring devices, and it has the function of automatically calculating and displaying the super compression factor. The setting standards are fully in line with the national standard SY/T6143-2004 "Measurement of Natural Gas Flow with Standard Orifice Plate Flowmeter" and can fully meet the measurement requirements of various natural gases in oil and gas fields and transmission pipelines across my country.

2. Product market background

The natural gas being sold in our country is in a period of complex and diversified temperaments, and it is expected that this status quo will remain for a long time in the future. Therefore, in order to reflect the importance of the calorific value of natural gas and eliminate the controversy caused by traditional volume measurement, the development of natural gas Energy metering will become an important measure. Now that the natural gas energy measurement technology system is basically in place, in order to achieve the cumbersome trade technology and procedures when imported natural gas is sold domestically, and at the same time better promote China's natural gas marketization process and avoid the situation of inhomogeneity at the same price, domestic The development of natural gas energy measurement has become an inevitable trend. The natural gas measuring instruments produced by our company are based on primary sensor signals and are developed with secondary instruments for trade settlement in accordance with the relevant standards of the natural gas industry. This product solves the problem of energy demand accuracy and settlement mechanism between supply and demand parties to a certain extent. question.

3. Main technical principles of the product

1. The software is based on the central processing unit of the ARM processor, uses an embedded operating system, and has an external built-in flash memory.

2. The hardware isolates and switches the channel signal value through the optocoupler relay, and converts it into a recognizable standard signal. The linear conversion from analog to digital is realized through the reference power supply, operational amplifier, and AD converter.

3. The software algorithm is based on the properties of natural gas components and the national standard SY/T6143-2004 "Measurement of Natural Gas Flow with Standard Orifice Plate Flowmeter", and realizes the flow measurement of natural gas through mathematical operations and digital discretization processing, and obtains The totalizer can realize remote meter reading and network communication according to the output mode.

4. The power supply is a closed-loop switching power supply, and the auxiliary power supply is power distribution for the flow sensor. The power of the entire power supply is not less than 5W.

5. The product has a USB data transfer function. The historical curve of process volume changes or related historical data can be retrieved at any time through a USB flash drive and host computer analysis software. It can be used with various flow sensors such as V-cones.

6. The instrument has good anti-theft, anti-power-down and other performance characteristics.

7. In the natural gas metering system, the product is responsible for the flow collection, control, analysis, recording, communication networking and other functions of the product.

4. Product application

System function introduction

1. Real-time data display: The system displays key data detected by the instrument in real time during the working process. This screen displays real-time data of a total of 5 pipelines, including instantaneous flow, cumulative flow, pressure, differential pressure, temperature and instrument clock.

2. Hourly and daily cumulative real-time data table. The NHR-7630R itself can store the hourly cumulative volume of the last 24 hours and the daily cumulative volume of the last 7 days.

3. Saving and reading historical data. The system can customize report formats such as daily, monthly, and annual reports according to customer requirements. The system will automatically save historical data to Excel, ACCESS or SQL Server at regular intervals to facilitate the use of other systems or individuals. The system can also save data to its own real-time database for the system itself to call.

You can see historical data in the table by clicking the corresponding "Query" button.

Product Image

5. Conclusion

NHR-7630R has high accuracy and immunity in natural gas energy metering. After combined use of this system, data detection and storage can be well realized, and the portable operation of natural gas composition setting and sensor configuration can be easily completed, so that the function of the instrument can be fully utilized to a greater extent. This system has been accepted by the customer and put into use. Through the use of the system, users can better realize the measurement and settlement of natural gas transportation, and improve the accuracy and reliability of measurement.