DL/T 467-2019 in English
VALIDPerformance test for pulverizers and pulverizing systems of power station
- Issued on:2019-06-04
- Implemented on:2019-10-01
- File Format:PDF
- Delivery:Via email within 10 business days
Price(USD)：
$1,020.00
$990.00
$990.00
Introduction
Analysis of the core content of the standard
| Test type | Key parameters | Allowance deviation |
|---|---|---|
| Ball mill output test | Optimal ball loading, ventilation volume | ±5% |
| Medium speed coal mill fineness test | Coal powder uniformity index, stone coal amount | R90≤±2% |
| Fan mill pure air test | Increase pressure head, ventilation efficiency | ≤0.05% output |
Technology evolution and standard update
Main revisions of the 2019 version of the standard:
- New term definitions: 3 items such as fan power consumption and powder making power consumption
- Optimize the measurement point layout requirements, the measurement points of the powder-containing pipeline require a ≥10D straight pipe section
- Improve the minimum output test specification for medium-speed mills, requiring a wind speed of ≥18m/s
Typical test case analysis
Ball mill optimal loading test
Calculate the theoretical value according to formulas (14)-(21), and verify the actual loading by the chord length measurement method:
α = 2arcsin((d+2h)/D) G = (D²/8)(α-sinα)Lρb
Measured data of a Φ3.2×4.5m mill in a power plant:
- Bulk density of steel balls ρb=4.9t/m³
- The power consumption of pulverizing powder is the lowest when the loading capacity is 28t
Implementation suggestions
- Pretreatment requirements: Coal feeder calibration and velocity tube pure air calibration must be completed before the test
- Data verification: The deviation between the pulverized coal sampling volume and the actual output should be ≤10%
- Safety control: Static pressure measurement of the pulverized coal pipeline requires an anti-blocking design
Sample only — not a preview of DL/T 467-2019
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