NB/T 11644-2024Determination of carbon and hydrogen in solid biofuels - Coulometric and gravimetric method (English PDF)

Preface

This document is in accordance with the provisions of GB/T 1.1-2020 "Guidelines for standardization work Part 1: Structure and drafting rules for standardization documents" Drafting.

1 Scope

This document specifies the principle of the method for determining hydrogen in solid biomass fuels by the electrical method and carbon in solid biomass fuels by the gravimetric method.

Reagents and materials, instruments and equipment, experimental preparation, experimental steps, calculation of results and precision of methods, etc.

This document applies to solid biomass fuels.

2 Normative references

The contents of the following documents constitute the essential clauses of this document through normative references in this document.

For referenced documents without a date, only the version corresponding to that date applies to this document; for referenced documents without a date, the latest version (including all amendments) applies to this document. document.

GB/T 6682 Specifications and test methods for water used in analytical laboratories

GB/T 21923 General rules for inspection of solid biomass fuels

GB/T 28730 Solid biomass fuel sample preparation method

GB/T 28731 Industrial analysis methods for solid biomass fuels

3 Terms and definitions

The terms and definitions defined in GB/T 21923, GB/T 28730 and the following apply to this document.

4 Principles of the method

A certain amount of solid biomass fuel sample is burned in an oxygen flow, and the generated water reacts with phosphorus pentoxide to form metaphosphoric acid. The metaphosphoric acid is electrolyzed.

The hydrogen content in the solid biomass fuel is calculated based on the amount of electricity consumed by electrolysis; the generated carbon dioxide is absorbed by the carbon dioxide absorbent, and the amount of hydrogen in the solid biomass fuel is calculated based on the amount of electricity consumed by electrolysis.

The carbon content in the solid biomass fuel is calculated by collecting the weight increment of the collecting agent. The sulfur oxides and chlorine generated after the sample is burned are treated with the pyrolysis products of silver permanganate.

Nitrogen oxides are removed using granular manganese dioxide to eliminate their interference with carbon determination.

5 Reagents and Materials

Unless otherwise specified, all reagents used in this document are of analytical grade and the water used should meet the requirements of Grade III water specified in GB/T 6682.