ISO 9096:2017 定常発生源排出量 — 粒子状物質の質量濃度の手動測定 | ページ 2

Foreword

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The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different types of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives ).

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This document was prepared by ISO Technical Committee ISO/TC 146, Air quality, Subcommittee SC 1, Stationary source emissions.

This third edition cancels and replaces the second edition (ISO 9096:2003), of which it constitutes a minor revision. It also incorporates the Technical Corrigendum ISO 9096:2003/Cor.1:2006. The changes compared to the previous edition are as follows:

• Formula (11): the percent symbol has been added twice.
• Formula (13): the percent symbol has been added twice.
• Figure A.2: < 0,2 has been corrected to > 0,2.
• Formula (B.6): the parentheses have been removed.
• Formula (B.7): the formula has been corrected.

Introduction

Close liaison and cooperation between ISO/TC 146/SC 1 and CEN/TC 264 has resulted in the preparation of this document, ISO 12141 and EN 13824-1. This document is similar to EN 13284-1 with additional emphasis given on the use of high-volume sampling techniques. A representative, integrated sample is extracted from the flue gas and the particulate matter entrained in the gas sample is separated by a filter. The pre-weighed filter is subsequently dried and weighed. A relative increase in the mass is attributed to the collection of particulate matter on the filter.

To meet the specifications of this document, the particulate sample is weighed to a specified level of accuracy. This level of accuracy is achieved by:

• a) exercising extreme care in weighing, in accordance with the procedures of this document;
• b) extending the sampling time at conventional sampling rates;
• c) sampling at higher rates for conventional sampling times (high-volume sampling);
• d) recovering all dust upstream of the filter.

1 Scope

This document describes a reference method for the measurement of particulate matter (dust) concentration in waste gases of concentrations from 20 mg/m³ to 1 000 mg/m³ under standard conditions.

This document is applicable to the calibration of automated monitoring systems (AMS). If the emission gas contains unstable, reactive or semi-volatile substances, the measurement will depend on the filtration temperature. In-stack methods can be more applicable than out-stack methods for the calibration of automated monitoring systems.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.

3 Terms and definitions

For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

3.5

isokinetic sampling

sampling at a flowrate such that the velocity and direction of the gas entering the sampling nozzle, v_n, are the same as that of the gas in the duct at the sampling points, v_s

Note 1 to entry: See Figure 1 and Annex D.

Note 2 to entry: The velocity ratio, v_n/v_s, expressed as a percentage characterizes the deviation from isokinetic sampling.

Figure 1 — Isokinetic sampling

Key

vs	stack gas velocity
vn	velocity in the nozzle

3.6

hydraulic diameter

d_h

characteristic dimension of a duct cross-section

(1)

where

	As	is the cross-sectional area of the sampling plane;
	ls	is the length of the perimeter of the sampling plane.

3.7

sampling plane

plane normal to the centreline of the duct at the sampling position

Note 1 to entry: See Figure 2.

Figure 2 — Illustration of definitions in relation to a circular duct

Key

1	sampling lines
2	sampling plane
3	access port
4	flow
5	top of duct

Bibliography