HJ/T 57-2000 (HJT 57-2000)

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HJ/T 57-2000	English	70	Add to Cart	0--3 minutes. Auto-delivered.	Determination of sulphur dioxide from exhausted gas of stationary source - Fixed-potential electrolysis method	HJ/T 57-2000	Obsolete	HJ/T 57-2000

HJ/T 57-2000
HJ
Standard of the State Environmental
Protection Administration
Determination of Sulphur Dioxide from Exhausted Gas of
Stationary Source Fixed-potential Electrolysis Method
ISSUED ON. DECEMBER 07, 2000
IMPLEMENTED ON. MARCH 01, 2001
Issued by. State Environmental Protection Administration of the
People's Republic of China
Table of Contents
Foreword ... 3 
1 Scope ... 4 
2 Normative References ... 4 
3 Principles ... 4 
4 Instruments ... 5 
5 Reagents ... 5 
6 Procedures... 5 
7 Calculation of Sulfur Dioxide Emission Rate ... 6 
Foreword
This Standard specifies the fixed-potential electrolysis method to measure the
concentration of sulfur dioxide from exhausted gas of stationary source and the
determination of discharging total quantity. During the process of formulation, the
national standard GB/T 16157-1996 "The Determination of Particulates and Sampling
Methods of Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source" and
part of the standard "Monitoring and Analysis Methods of Air and Waste Gas" that was
printed and distributed by the State Environmental Protection Administration are taken
as the references; the relevant testing instrument technical criteria and enterprise
standard from domestic and foreign countries are also taken as the references.
This Standard was proposed by the State Environment Protection Administration -
Department of Science, Technology and Standards.
This Standard was drafted by China Environmental Monitoring Station.
The State Environmental Protection Administration is responsible for the interpretation
of this Standard.
Standard of the State Environmental Protection Administration
Determination of Sulphur Dioxide from Exhausted Gas of
Stationary Source Fixed-potential Electrolysis Method
1 Scope
This Standard specifies the fixed-potential electrolysis method to measure the
concentration of sulfur dioxide from exhausted gas of stationary source and the
determination of discharging total quantity
2 Normative References
The provisions involved in the following standard are quoted in this Standard to
constitute the provisions of this Standard; they have the same effect with this Standard.
GB/T 16157-1996 “Determination of Particulates and Sampling Methods of
Gaseous Pollutants Emitted from Exhaust Gas of Stationary Source”
3 Principles
The sulfur dioxide (SO2) in flue gas spreads and passes the osmotic membrane of
sensor; then enter into the electrolyzer. The oxidizing reaction occurs at the constant-
potential working electrode.
SO2+2H2O==== 24SO +4H++2e
The limited diffusion current i is generated in certain field; the current size is
proportional to the concentration of sulfur dioxide, that is.
cZFSDi  
Under the specified working conditions, the electron transfer number Z, faraday
constant F, diffusion area S, diffusion coefficient D and diffusion layer thickness δ are
all constants, so the concentration of sulfur dioxide c can be measured by limited
current i.
Measuring range. 15 mg /m3~14300 mg /m3. Measuring error ±5%.
7.1 Measurement and calculation of emission flow
The exhausting velocity shall be measured according to those specified in Clauses
7.1~7.5 of GB/T 16157-1996; the dry emission flow in normal conditions shall be
calculated according to those specified in Clause 7.6.
7.2 Calculation of sulfur dioxide emission rate
7.2.1 When the concentration of sulfur dioxide is represented in ppm (V/V), the
concentration can be translated into the concentration of dry flue gas sulfur dioxide in
normal condition.
cC  4.22
64 (mg/m3)
Where.
c′ — the concentration of dry flue gas sulfur dioxide in normal conditions (mg /m3).
7.2.2 Calculation of sulfur dioxide emission rate
G = C ×Qδn×10-6 (kg/h)
Where.
G — the sulfur dioxide emission rate (kg/h);
c′ — the dry exhausting sulfur dioxide concentration (mg/m3);
Qδn — the dry emission flow in normal conditions (dm3/h).