SIST ISO 17179:2019

INTERNATIONAL ISO
STANDARD 17179
First edition
2016-07-01
Stationary source emissions —
Determination of the mass
concentration of ammonia in flue
gas — Performance characteristics of
automated measuring systems
Émission des sources fixes — Détermination de la concentration
massique de l’ammoniac dans les gaz de combustion —
Caractéristiques de performance des systèmes de mesure automatisés
Reference number
©
ISO 2016
© ISO 2016, Published in Switzerland
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ii © ISO 2016 – All rights reserved

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 2
4 Symbols and abbreviated terms . 5
5 Principle . 6
6 Description of the automated measuring systems . 6
6.1 Sampling and sample gas conditioning systems . 6
6.2 Analyser equipment . 6
7 Performance characteristics . 6
7.1 Performance criteria . 6
7.2 Determination of the performance characteristics . 7
7.2.1 Performance test . 7
7.2.2 Ongoing quality control . 8
8 Measurement procedure . 8
8.1 General . 8
8.2 Choice of the measuring system . 8
8.3 Sampling . 9
8.3.1 Sampling location . 9
8.3.2 Sampling point(s) . 9
8.4 Data collection . 9
8.5 Calculation . 9
9 Quality assurance and quality control procedures .10
9.1 General .10
9.2 Frequency of checks .10
9.3 Calibration, validation and measurement uncertainty .11
10 Test report .11
Annex A (informative) Extractive differential NO measurement technique .13
x
Annex B (informative) Extractive direct NH measurement technique .17
Annex C (informative) In situ and direct NH measurement with TLS analyser .20
Annex D (normative) Operational gases .24
Annex E (normative) Procedures for determination of the performance characteristics
during the general performance test .26
Annex F (informative) Examples of the results for the assessment of ammonia AMS .34
Annex G (informative) Calculation of uncertainty of measurement of NH .36
Bibliography .40
Foreword
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The committee responsible for this document is ISO/TC 146, Air quality, Subcommittee SC 1, Stationary
source emissions.
iv © ISO 2016 – All rights reserved

Introduction
Selective Catalytic Reduction (SCR) and Selective Non-Catalytic Reduction (SNCR) NO control systems
x
are used for emission control of NO in flue gas from power generation plants, waste incinerators and
x
others. The NO reduction technologies require the injection of ammonia (NH ) and/or urea into flue
x 3
gas. The SCR system is designed to be operated at unreacted NH in flue gas (or remained NH in flue
3 3
3 3
gas) as small as possible (typically below 2 mg/m to 4 mg/m NH concentration) with more than
90 % NO reduction efficiency. The standardization of a measurement method of NH is thus strongly
x 3
desired for efficient operation and maintenance of the NO control systems and for minimization of
x
environmental impacts due to ammonia and NO .
x
INTERNATIONAL STANDARD ISO 17179:2016(E)
Stationary source emissions — Determination of the mass
concentration of ammonia in flue gas — Performance
characteristics of automated measuring systems
1 Scope
This International Standard specifies the fundamental structure and the most important performance
characteristics of automated measuring systems for ammonia (NH ) to be used on stationary source
emissions, for example, combustion plants where SNCR/SCR NO control systems (deNO systems) are
x x
applied. The procedures to determine the performance characteristics are also specified. Furthermore,
it describes methods and equipment to determine NH in flue gases including the sampling system and
sample gas conditioning system.
This International Standard describes extractive systems, based on direct and indirect measurement
methods, and in situ systems, based on direct measurement methods, in connection with a range of
analysers that operate using, for example, the following principles:
— ammonia conversion to, or reaction with NO, followed by chemiluminescence (CL) NO difference
x
measurement for ammonia (differential NO );
x
— ammonia conversion to, or reaction with NO, followed by non-dispersive ultraviolet (NDUV)
spectroscopy NO difference measurement for ammonia (differential NO );
x x
— Fourier transform infrared (FTIR) spectroscopy;
— non-dispersive infrared (NDIR) spectroscopy with gas filter correlation (GFC);
— tuneable laser spectroscopy (TLS).
The method allows continuous monitoring with permanently installed measuring systems of NH
emissions, and is applicable to measurements of NH in dry or wet flue gases, for process monitoring,
long term monitoring of the performance of deNO systems and/or emission monitoring.
x
Other equivalent instrumental methods can be used, provided they meet the minimum requirements
proposed in this International Standard. The measuring system can be calibrated with certified gases,
in accordance with this International Standard, or comparable methods.
The differential NO technique using CL has been successfully tested on some power plants where the
x
NO concentration and NH concentration in flue gas after deNO systems are up to 50 mg (NO)/m and
x 3 x
10 mg (NH )/m , respectively. AMS based on FTIR, NDIR with GFC and TLS has been used successfully
in this application for measuring ranges as low as 10 mg (NH )/m .
2 Normative references
The following documents, in whole or in part, are normatively referenced in this document and are
indispensable for its application. For dated references, only the edition cited applies. For undated
references, the latest edition of the referenced document (including any amendments) applies.
ISO 9169, Air quality — Definition and determination of performance characteristics of an automatic
measuring system
ISO 14956, Air quality — Evaluation of the suitability of a measurement procedure by comparison with a
required measurement uncertainty
ISO 20988, Air quality — Guidelines for estimating measurement uncertainty
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
analyser
analytical part in an extractive or in situ AMS (3.3)
[SOURCE: ISO 12039:2001, 3.3]
3.2
automated measuring system
AMS
measuring system interacting with the flue gas under investigation, returning an output signal
proportional to the physical unit of the measurand (3.11) in unattended operation
Note 1 to entry: In the sense of this International Standard, an AMS is a system that can be attached to a duct or
stack to continuously or intermittently measure the mass concentration of
...