GB/T 39836-2021 PDF English
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GB/T 39836-2021: Test methods for slagging indexes in coal combustion---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GBT39836-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
CCS D 21
Test methods for slagging indexes in coal combustion
ISSUED ON: MARCH 09, 2021
IMPLEMENTED ON: OCTOBER 01, 2021
Issued by: State Administration for Market Regulation;
Standardization Administration of the People's Republic of
China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative references ... 4
3 Terms and definitions ... 5
4 Determination method A (Method Sc for probe slagging index) ... 6
5 Determination method B (comprehensive slagging index method R) ... 11
6 Evaluation index of slagging characteristics ... 12
Annex A (informative) Method F of clustering slagging index ... 13
Annex B (informative) Evaluation index of slagging characteristics ... 17
Test methods for slagging indexes in coal combustion
1 Scope
This document specifies the determination method, test device, test instrument
and method, data processing and calculation method for slagging indexes in
coal combustion.
This document is applicable to the determination for slagging indexes of power
coal products such as power station boilers and industrial boilers. Applicable
coal types are lignite, bituminous coal and anthracite (excluding coal with a total
content of Na2O and K2O greater than 3% in coal ash).
This document uses Method A as the arbitration method.
NOTE: This document also gives the determination method C for slagging indexes of coal
- Clustering slagging index method F, see Annex A.
2 Normative references
The following referenced documents are indispensable for the application 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.
GB/T 219, Determination of fusibility of coal ash
GB/T 474, Method for preparation of coal sample
GB/T 1574, Analysis of coal ash
GB/T 3715-2007, Terms relating to properties and analysis of coal
GB/T 19494.2, Mechanical sampling of coal Part 2: Method for sample
preparation
GB/T 39833, Test method for coal combustion characteristics - One-
dimensional furnaces method
DL/T 567.5, Test Methods of Fuel in Thermal Power Plants - Part 5: Fineness
of Pulverized Coal
DL/T 1106-2009, Test methods for pulverized coal combustion shagging
comprehensive slagging
4 Determination method A (Method Sc for probe
slagging index)
4.1 Method summary
The one-dimensional furnace carries pulverized coal with a certain amount of
air flow during the test. After entering the hearth, it will catch fire and burn when
the furnace wall emits heat, so that it burns out. One-dimensional furnace can
realize the suspension combustion test of pulverized coal and air under
dynamic conditions. The burning pulverized coal flow moves downwards along
the height of the hearth. Use silicon carbide rods as slagging probes to sample
when pulverized coal is burned in one-dimensional furnace. Then use a blade
to cut the slag sample on the surface of the silicon carbide rod to determine the
slag type. Calculate corresponding slag type assignment to obtain the probe
slagging index.
4.2 Test devices
The schematic diagram of the one-dimensional furnace test device is shown in
Figure 1. The one-dimensional furnace test bench is mainly composed of
powder feeding system, heating and temperature control system, combustion
furnace body system, air smoke system and sampling analysis system. The
one-dimensional furnace body adopts a vertically arranged electric heating
building block structure. It is mainly composed of ignition section, stable
combustion section and burnout section. Connect the powder feeder to the
ignition section. The end of the burnout section is connected to the flue gas
cooler, followed by dust collector and induced draft fan. Ash trough is at the
bottom of the furnace body, used to collect the ash residue from the combustion
of pulverized coal airflow. The outside of the furnace is covered with refractory
and thermal insulation materials to ensure that the temperature of the outer wall
of the furnace is ≤60°C. The residence time of pulverized coal particles in the
furnace is controlled at 2s~10s. It can meet the burning-out requirements of
pulverized coal particles in the furnace. The air leakage rate of the whole one-
dimensional furnace test device (that is, the percentage of the leaked air mass
in the flue gas mass at the inlet of the device) is controlled within 5%.
The pulverized coal burner is installed on the top of the hearth. The primary air
carries pulverized coal into the top of the hearth. The secondary air is arranged
around the primary air and fed from the top of the hearth. The flow of primary
air and secondary air can be measured and controlled by flow meter. Use hot
air to send powder. The air preheater can adjust the temperature of the hot air
Where,
n - Pulverized coal uniformity coefficient (take n=1);
Vdaf - Dry ash-free volatile matter of pulverized coal, %.
4.4.1.3 Requirements for deviation of pulverized coal fineness
The deviation of pulverized coal fineness is calculated according to formula (4):
R90 allowable deviation increases with the increase of Vdaf: When Vdaf is less
than 15%, ΔR90=1~2; when Vdaf=15%~25%, ΔR90=2~3; when Vdaf is greater
than 25%, ΔR90=3~4.
4.4.2 Test preparation
According to the specified conditions of test conditions in GB/T 39833, preheat
each section of the furnace body to the set temperature. Start the induced draft
fan and the blower one after another. Adjust hot air temperature and excess air
coefficient. Start the power feeder to adjust the amount of pulverized coal. After
the furnace temperature and flue gas composition of the pulverized coal
combustion in the one-dimensional furnace are stabilized, according to the
ignition position of the test coal, insert six silicon carbide slagging rods (probes)
into the selected measuring hole along the flame stroke. Make each slagging
rod at the initial stage of ignition, the highest flame temperature, the median
temperature and the furnace outlet.
4.4.3 Probe sampling
Maintain the stable operating conditions of the pulverized coal combustion of
the one-dimensional furnace. Wait for a sufficient amount of ash and slag layer
to deposit on the slagging probe. The continuous slagging time of the probe
sampling is determined by the ash content of the coal. Generally, it is
20min~30min.
4.4.4 Observation of slag type
After the test, pull out the slagging probe carefully. Keep it as it is. After cooling,
use a blade to scrape the slag sample on the surface of the silicon carbide rod.
Observe and record its slag type characteristics.
4.5 Data processing and calculation methods
θ - Characteristic temperature value corresponding to slag type, in Celsius (°C).
5 Determination method B (comprehensive slagging
index method R)
5.1 Method summary
According to the percentage of each component of coal ash (expressed as
oxide), calculate the individual slagging index of coal: mass ratio of SiO2 to
Al2O3 (SiO2/Al2O3), mass ratio of SiO2 in coal ash (G) and base/acid ratio (B/A).
Comprehend the softening temperature (ST) and mass ratio of SiO2 to Al2O3,
mass ratio of SiO2 in coal ash and base/acid ratio. Conduct weighted calculation
of comprehensive slagging index of coal (R) to judge its slagging characteristics.
The determination of softening temperature (ST) and precision is carried out
according to GB/T 219. The components of coal ash (expressed as oxides): the
content determination of SiO2, Al2O3, Fe2O3, CaO, MgO, Na2O, K2O and TiO2
and precision are implemented in accordance with GB/T 1574.
5.2 Data processing and calculation methods
Comprehend the softening temperature and mass ratio of SiO2 to Al2O3, mass
ratio of SiO2 in coal ash and base/acid ratio. According to empirical coefficient
weighted average method of formula (6), calculate the comprehensive slagging
index (R):
Where,
R - Comprehensive slagging index;
B/A - Base/acid ratio of coal ash;
SiO2/Al2O3 - Mass ratio of SiO2 to Al2O3 of coal ash;
ST - Softening temperature of coal ash, in Celsius (°C);
G - Mass ratio of SiO2 in coal ash.
NOTE: Method R is based on the weighted average method of empirical
coefficients obtained from the statistics of a large number of coal samples of
China's 300MW~600MW units.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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