Author Affiliations
1State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China2Zhejiang Energy Group Co., Ltd, Hangzhou 310007, Chinashow less
Fig. 1. Recording and reconstruction of digital holography
Fig. 2. Schematic diagram of the measurement equipment
Fig. 3. (a) Gas system; (b) Light path system. 1-Gas source, 2-Air filter, 3-Gas distributor, 4-Ball valve group, 5-Flowmeter group, 6-Aspirator, 7-Cyclone, 8-Chamber, 9-Ball valve, 10-Pressure gauge, 11-Sampling probe, 12-Pipe, 13-Sampled coal flow, 14-Dilution gas, 15 and 16-Protection gas, 17-Ejector gas, 18-Laser, 19-Attenuator, 20-Spatial filter, 21-Lens, 22-Camera, 23-Laser controller, 24-Synchronizer, 25-Computer
Fig. 4. (a) Framework of the software; (b) Flow chart of holograms processing
Fig. 5. On-site experiments
Fig. 6. (a) and (d) are typical holograms of coal powders from mill B and D; (b) and (e) are reconstructed images of (a) and (d), while the particle size information are plotted in (c) and (f) respectively
Fig. 7. and
results obtained by different methods
不同方法得到的
和
结果
Fig. 8. Comparison of PSD of different methods. (a) Mill B; (b) Mill D
Fig. 9. Online monitoring of pulverized coal fineness within 1 hour
Parameter | Unit | Value | B | D | Air flowrate | t/h | 49.88 | 50.28 | Coal flowrate | t/h | 23.1 | 22.05 | Diameter of pipes | mm | 460 | 460 | Temperature | ℃ | 80.03 | 80.05 | Pressure | kPa | 1.21 | 1.41 | Velocity | m/s | 20.59 | 20.90 | Concentration | kg/kg air | 0.46 | 0.44 |
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Table 1. Parameters of coal powder flow in primary pipes