GB/T 39833-2021 PDF English
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GB/T 39833-2021: Test method for coal combustion characteristics - One-dimensional furnaces method
---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/GBT39833-2021
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 73.040
CCS D 21
Test method for coal combustion characteristics -
One-dimensional furnaces method
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 ... 4
4 Principle ... 5
5 Method summary ... 5
6 Instruments and equipment... 5
7 Test conditions ... 7
8 Test testing ... 9
9 Data processing and analysis methods ... 9
10 Precision ... 11
11 Combustion characteristics evaluation indexes ... 11
Annex A (informative) Combustion characteristics evaluation indexes ... 12
Test method for coal combustion characteristics -
One-dimensional furnaces method
1 Scope
This document specifies the one-dimensional furnaces method, instruments
and equipment, test conditions, test testing, data processing and analysis
methods, evaluation indexes, precision for ignition temperature and burnout
efficiency during pulverized coal combustion process.
This document is applicable to the one-dimensional furnaces method testing for
ignition temperature and burnout efficiency of lignite, bituminous and anthracite.
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 474, Method for preparation of coal sample
GB/T 19494.2, Mechanical sampling of coal Part 2: Method for sample
preparation
DL/T 567.5, Test Methods of Fuel in Thermal Power Plants - Part 5: Fineness
of Pulverized Coal
DL/T 567.6, Test Method for Thermal Power Plant Fuel Part 6: Determination
Methods of Fly Ash and Slag Fuel
DL/T 1106-2009, Test methods for pulverized coal combustion shagging
characteristics and burnout rate on one-dimensional flame furnace
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1 ignition temperature; Ti
the starting temperature of the ignition reaction between the pulverized coal
airflow and the surrounding air to form a combustible mixture
3.2 burnout efficiency; B
under the combustion test conditions of the pulverized coal airflow in a one-
dimensional furnace, a solid sample is taken at the outlet of the furnace and its
combustible content is analyzed; the burnout efficiency refers to the percentage
of burnt combustibles to initial combustibles
4 Principle
During the test of the one-dimensional furnace, a certain amount of air flow is
used to carry pulverized coal. After entering the furnace, it will be ignited and
burned by the heat of the furnace wall, so that it burns. One-dimensional
furnace realizes pulverized coal and air suspension combustion test under
dynamic conditions. The burning pulverized coal flow moves downwards along
the height of the furnace. The ignition temperature of the pulverized coal airflow
can be obtained by testing the temperature of the flue gas in the furnace.
Through the analysis of combustion products, the characteristics of pulverized
coal burnout can be evaluated.
5 Method summary
Multiple temperature measurement points are arranged from the top of the
furnace of the one-dimensional furnace downwards. Use thermocouple to
measure the temperature change along the pulverized coal gas flow. Analyze
to obtain the ignition temperature. Conduct the fly ash sample at the tail flue
dust collector. Conduct the bottom slag sample at the ash trough at the bottom
of the furnace. Test the combustible content in fly ash and bottom slag.
Calculate and analyze the burnout efficiency.
6 Instruments and equipment
6.1 One-dimensional furnace test device
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
Description of index numbers:
1 - Furnace body;
2 - Furnace top;
3 - Burner;
4 - Powder feeder;
5 - Blower;
6 - Flowmeter;
7 - Primary air duct;
8 - Secondary air duct;
9 - Air preheater;
10 - Tail flue;
11 - Dust collector;
12 - Flue gas cooler;
13 - Induced draft fan;
14 - Hearth test hole.
Figure 1 -- Schematic diagram of one-dimensional furnace combustion
test device
6.2 Test instruments
6.2.1 Primary air and secondary air thermometers (temperature measuring
element is thermocouple): control temperature error is ±5°C.
6.2.2 Primary and secondary air flow meters: precision level is 4%.
6.2.3 Pulverized coal combustion flue gas thermometer (insert the
thermocouple into the hearth to test): precision level is 0.25%.
7 Test conditions
7.1 Pulverized coal fineness requirements
7.1.1 Measured value of pulverized coal fineness
Prepare pulverized coal in accordance with the requirements of GB/T 474 or
GB/T 19494.2. Take no less than 100g of air-dried coal samples and grind them
all. According to the requirements of DL/T 567.5, select and calculate the
fineness of pulverized coal until the test coal samples all meet the requirements
of R200 and R90 fineness. The calculation of R200 and R90 is carried out according
to formula (1) and formula (2):
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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