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GB/T 40508-2021 English PDF (GBT40508-2021)

GB/T 40508-2021 English PDF (GBT40508-2021)

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GB/T 40508-2021: Determination of tar and dust concentrations in biomass-based synthetic gas

This document specifies the determination method, result calculation and repeatability requirements of tar and dust concentrations in biomass-based synthetic gas. This document applies to combustible gases which are produced from raw materials, such as biomass wastes of agricultural sources, forestry sources, industrial sources, and domestic sources, through thermo-chemical conversion methods such as pyrolysis or gasification.
GB/T 40508-2021
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 27.010
CCS F 01
Determination of tar and dust concentrations in
biomass-based synthetic gas
ISSUED ON: AUGUST 20, 2021
IMPLEMENTED ON: MARCH 01, 2022
Issued by: State Administration for Market Regulation;
Standardization Administration of the PEOPLE Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 4
4 Determination method ... 5
5 Result calculation ... 9
6 Repeatability ... 10
Appendix A (Normative) Conversion method of gas volume under standard
conditions ... 11
Determination of tar and dust concentrations in
biomass-based synthetic gas
1 Scope
This document specifies the determination method, result calculation and repeatability requirements of tar and dust concentrations in biomass-based synthetic gas.
This document applies to combustible gases which are produced from raw
materials, such as biomass wastes of agricultural sources, forestry sources, industrial sources, and domestic sources, through thermo-chemical conversion methods such as pyrolysis or gasification.
2 Normative references
The following documents are normatively referenced in this document and are indispensable for its application. For dated references, only the version corresponding to that date is applicable to this document; for undated
references, the latest version (including all amendments) is applicable to this document.
GB/T 1914-2017, Chemical analytical filter paper
GB/T 12206-2006, Testing method to determine the calorific values of town gas
GB/T 12208-2008, Test methods of components and impurities of the
manufactured gas
3 Terms and definitions
The following terms and definitions are applicable to this document.
3.1
biomass-based synthetic gas
Combustible gas which is produced by biomass raw materials through thermo- chemical conversion methods such as pyrolysis or gasification.
3.2
4.2.10 Vacuum drying oven: the temperature control range is from room
temperature to 200 ??C; the temperature control accuracy is ??1 ??C; the vacuum degree range is 0 kPa ~ 98 kPa.
4.2.11 Buchner funnel: the inner diameter is 80 mm.
4.2.12 Filter bottle: the volume is 1 000 mL.
4.2.13 Dryer: it contains color-changing silica gel or granular anhydrous calcium chloride.
4.2.14 Drying dish: the diameter is 150 mm.
4.2.15 Round-bottom flask: the volume is 250 mL; the bottleneck has a standard grinding mouth whose diameter is 24/29.
4.3 Sampling requirements and procedures
4.3.1 Sampling requirements
4.3.1.1 Sampling position and requirements: the gas sampling position and requirements shall be implemented in accordance with 5.3.1 of GB/T 12208- 2008.
4.3.1.2 The gas production equipment shall be in a stable operating state during sampling; the equipment operating parameters shall be stable and the types of raw materials shall be unchanged during the test.
4.3.1.3 If the gas pressure at the sampling point is lower than the atmospheric pressure, a vacuum controllable suction pump should be connected after the wet gas flow meter, so as to ensure that the gas can pass through the sampling device smoothly. The gas after the volume measured by the wet gas flow meter shall be discharged to an open outdoor area to avoid possible safety risks. 4.3.2 Sampling procedures
4.3.2.1 Add 150 mL ~ 200 mL of trichloromethane to the 6 gas washing bottles; place all the gas washing bottles in the cooling pool. The height of the ice-water mixture in the cooling pool shall be higher than the height of the solvent in the gas washing bottles. It shall be ensured that the cooling pool is always in a state of coexistence of ice and water during the sampling process. Connect the sampling device according to Figure 1; check the air tightness of the device; confirm that the air tightness of the device is good; record the wet gas flow meter reading V1.
4.3.2.2 Open the sampling valve; adjust the gas flow rate to 5 L/min ~ 10 L/min; record the sampled gas average temperature (t1), gas pressure (p1) and
atmospheric pressure (p).
dripping speed in the rotary evaporator is about 0.25 drops/s, stop the rotary evaporator.
4.4.2.3 Transfer the filtrate from the filter bottle to the flask in batches; repeat 4.4.2.2; use about 30 mL of trichloromethane to clean the filter bottle twice; transfer all the cleaning solvents to the flask for rotary evaporation. 4.4.2.4 When the dripping speed of the liquid in the rotary evaporator is about 0.25 drops/s, continue the rotary evaporation for 30 minutes and then end it; if a small amount of moisture is still observed in the flask, add about 20 mL of trichloromethane to the flask.
4.4.2.5 Repeat 4.4.2.4 until no moisture can be observed in the flask.
4.4.2.6 Remove the flask and put it in a desiccator to cool to room temperature; then, weigh it. The reading is accurate to 0.1 mg; the weighed mass m3 is used as the basis for calculation of the result. If the mass of the obtained tar is less than 100 mg, the tar mass result of this time shall be converted to adjust the gas sampling volume, so as to the to ensure that the tar mass measured by subsequent tests is greater than 100 mg. The result of the last test shall prevail. 4.4.3 Determination of dust concentration
4.4.3.1 Transfer the filter cake and filter paper to a clean and dry dish of a known mass of m4.
4.4.3.2 Place the drying dish in a vacuum drying oven for 12 hours. Set the temperature of the drying oven to 80 ??C. After removing the drying dish, put it in a desiccator and cool to room temperature before weighing. The reading is accurate to 0.1 mg.
4.4.3.3 Carry out inspection drying, for 0.5 h each time, until the difference between the last two weighing results does not exceed 0.3 mg. Use the mass m5 of the last weighing as the basis for calculation of the results.
4.4.3.4 If the mass of the obtained dust is less than 100 mg, the dust mass result of this time shall be converted to adjust the gas sampling volume, so as to ensure that the dust mass measured by subsequent tests is greater than 100 mg. The result of the last test shall prevail.
5 Result calculation
5.1 The tar concentration in biomass-based synthetic gas is calculated
according to Formula (1):
Where:
TC ?€? the tar concentration in biomass-based synthetic gas, in milligrams per cubic meter (mg/m3);
m2 ?€? the mass of the 250 mL flask, in milligrams (mg);
m3 ?€? the sum of mass of the 250 mL flask and tar, in milligrams (mg);
V0 ?€? the value of gas volume under standard conditions [calculated according to Formula (A.1) in Appendix A], in liters (L).
5.2 The dust concentration in biomass-based synthetic gas is calculated according to Formula (2):
Where:
DC ?€? the dust concentration in biomass-based synthetic gas, in milligrams per cubic meter (mg/m3);
m1 ?€? the mass of the quantitative filter paper, in milligrams (mg);
m4 ?€? the mass of the drying dish, in milligrams (mg);
m5 ?€? the sum of mass of the quantitative filter paper, drying dish and dust, in milligrams (mg).
6 Repeatability
When the tar or dust concentrations in biomass-based synthetic gas is less than 5 mg/m3, the absolute difference between the two independent measurement results that are obtained under repeatability conditions does not exceed 14% of the arithmetic mean; when the tar or dust concentration is greater than or equal to 5 mg/m3, the absolute difference between two independent determination results that are obtained under repeatability conditions does not exceed 7% of the arithmetic mean.

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