Procedure

VN

Overview

This Technical Specification specifies a simplified method for the determination of the gross calorific value of waste at constant volume and at the reference temperature of 25 °C in a bomb calorimeter calibrated by combustion of certified benzoic acid. The determination of gross calorific value is carried out without thermo-chemical corrections. These corrections typically result in minor changes of the result. The influence of these corrections is shown in Annex C. The result of this method is the gross calorific value at constant volume with both the water of the combustion products and the moisture of the waste as liquid water. This Technical Specification also specifies a simplified calculation of the net calorific value from the gross calorific value. For the purpose of this Specification, the value of the net calorific value does not need to be determined exactly. The correction for hydrogen is simplified by the use of typical hydrogen contents derived from table values of hydrogen contents in common types of waste. This Technical Specification specifies a quick method to determine calorific value; a more comprehensive analysis is described in ISO 1928. Waste can contain water and (unburnable) solids in large amounts. Therefore their calorific value - especially on the "as received" basis - can be quite low. For some purposes it may be sufficient to determine the gross calorific value only, and not the net calorific value. This Technical Specification is applicable for the evaluation of suitability of waste to be treated by thermal processes and for the energy to be recovered. This Technical Specification is applicable to all kinds of waste. The preliminary work has been prepared by Working Group 5 "Analysis of waste - Selected groups parameters" of CEN/TC 292. The committee responsible for this standard is NA 119-01-02-02 UA "Chemische und physikalische Verfahren" ("Chemical and physical processes") at the Water Practice Standards Committee (NAW) at DIN.

Document: references other documents

Responsible national committee

NA 119-01-02-02-09 AK - Physical methods  

Responsible european committee

CEN/TC 444/WG 5 - Physical tests