GB/T 35211-2017 English PDF

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GB/T 35211-2017: Measurement of nature gas calorific value -- Continuous combustion
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 35211-2017	279	Add to Cart	3 days	Measurement of nature gas calorific value -- Continuous combustion	Valid

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Basic data

Standard ID: GB/T 35211-2017 (GB/T35211-2017)
Description (Translated English): Measurement of nature gas calorific value -- Continuous combustion
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: E24
Classification of International Standard: 75.060
Word Count Estimation: 14,177
Date of Issue: 2017-12-29
Date of Implementation: 2018-07-01
Regulation (derived from): National Standards Bulletin 2017 No. 32
Issuing agency(ies): General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China

GB/T 35211-2017: Measurement of nature gas calorific value -- Continuous combustion

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Measurement of nature gas calorific value - Continuous combustion ICS 75.060 E24 National Standards of People's Republic of China Natural gas - Determination of calorific value - Continuous combustion method 2017-12-29 Posted 2018-07-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China China National Standardization Administration released Directory Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 measurement principle 1 4 test conditions 1 5 material 1 5.1 standard gas 5.2 verification gas 2 6 instruments and equipment 2 6.1 calorific value direct measurement system 2 6.2 gas decompression unit 2 6.3 calorimeter 2 6.4 signal acquisition and processing unit 3 7 Test 3 7.1 Instrument Calibration 3 7.2 Sample Test 3 8 data processing 3 Repeatability and uncertainty 4 9.1 Repeatability 4 9.2 Uncertainty 4 Appendix A (Informative) Standard gas and standard curve example 5 Appendix B (informative) Verification gas example 7 Appendix C (informative) calorific value example 8

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009. This standard is proposed by China National Petroleum Corporation. This standard by the National Natural Gas Standardization Technical Committee (SAC/TC244) centralized. This standard was drafted by CNPC Southwest Oil and Gas Field Branch Natural Gas Research Institute, China Institute of Metrology. The main drafters of this standard. Zhang Lulu, Tang Meng, Pan Chunfeng, Wang Haifeng, Luo Qin, Zhou Li, Chang Hong Kong. Natural gas - Determination of calorific value - Continuous combustion method

1 Scope

This standard specifies the continuous combustion gas calorimeter measurement of natural gas calorific value. This standard applies to 30MJ/m3 ~ 40MJ/m3 high calorific value of natural gas measurement. Note. When there is a suitable standard gas, the measurement range of high calorific value of natural gas can be expanded.

2 Normative references

The following documents for the application of this document is essential. For dated references, only the dated version applies to this article Pieces. For undated references, the latest edition (including all amendments) applies to this document. GB/T 5274 Gas analysis Calibration Preparation of mixed gases Weighing GB/T 11062-2014 Method of calculating calorific value, density, relative density and Wobbe index of natural gas

3 measurement principle

A certain amount of gas, through the wet gas flow meter into the combustion chamber completely burned, and then through the heat exchanger, the heat generated by the combustion Hand to the absorption medium, making the medium temperature increases. The amount of heat generated by the gas is obtained from the temperature at which the test medium is raised. In the combustion measurement process, using the same motor driven with a gas and thermal adsorption medium wet flow meter. Flow meter placed in constant Temperature tank, the water remained stable and controlled at a certain temperature, by regulating the water temperature control gas and combustion air temperature, gas combustion generated Water vapor condensation into liquid, measured the value of high-calorific gas.

4 test conditions

4.1 Ambient temperature Maintain the room temperature 22.5 ℃ ~ 24.5 ℃, temperature fluctuations of not more than 0.3 ℃. 4.2 Water temperature .22.0 ℃ ~ 23.0 ℃, temperature fluctuations of not more than 0.3 ℃. 4.3 Relative humidity environment. The range of 40% to 60%, every 4h change of not more than 5%.

5 material

5.1 standard gas 5.1.1 Methane Purity (mole fraction) is not less than 99.995%. 5.1.2 Determination of calorific value of the standard gas Prepared according to GB/T 5274 or purchased from the nationally accredited production unit. Two kinds of standard gases with a heating value greater than that of methane, HH and HL, are required, each of which is a mixture of methane and ethane, where HH is methane (Mole fraction, the same below) 87.7%, ethane 12.3%; HL 93.4% of methane, ethane 6.6%. ......

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