GB/T 40508-2021Determination of tar and dust concentrations in biomass-based synthetic gas (English PDF)

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.

4 Determination method

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.

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. […]