FM series fan mill
key word：Heat exchange element
Category:
Product description
FM series fan mill
1. Introduction
1.1. Purpose
It is mainly used in power plant, chemical plant and other pulverized coal preparation systems, and it can also complete the functions of coal grinding, drying and transportation.
1.2. Model meaning
FM ** • ##
FM --- fan mill
**-----Outer diameter of striking wheel (* mm)
##----Effective width of striking wheel
1.3. Structural features
Structural drawing of FM type fan pulverizer 19-1
FM type fan coal mill is composed of gate, shaft end fixing device, plug plate and expansion joint, separator (upper and lower sections), casing, striking wheel, sealing air device, bearing box, coupling, bearing box base, foundation and other assembly parts.
FM type fan mill is suitable for grinding lignite and bituminous coal with large moisture content and grindability coefficient
1.3.1. The coal is always in suspension state in the fan mill with strong drying ability, and the inlet has suction force, which can extract part of furnace smoke to improve the temperature of desiccant. Therefore, FM type fan mill is suitable for grinding lignite and bituminous coal with high moisture content.
1.3.2. The fan mill has the dual functions of coal grinding and ventilation. Coal mill M can also produce air pressure of 1500 ~ 2000Pa at the same time, so it can directly blow pulverized coal into the furnace for combustion, thus greatly simplifying the boiler combustion system.
1.3.3. The structure is simple and compact, the metal consumption is small, and the power consumption of pulverizing is low.
1.4. Form
According to the requirements for fineness of pulverized coal, FM type fan pulverizer can be divided into two types according to different separators (see Fig. 19-2 and Fig. 19-3.)
Fig. 19-2 fan mill with dual channel inertia separator and Fig. 19-3 fan mill with single channel inertia separator
2. Main technical parameters
The basic parameters of FM series fan mill are shown in table 19-1
| Model | Rated capacity BM0 (t/h) |
Impeller diameter D2/D1 (mm) |
fan plate height D (mm) |
fan plate width b (mm) |
Rotating speed n (r/min) |
Linear velocity of impeller outer edge ω2 (m/s) |
Characteristic value D22bn |
Recommonded value | Motor power P (kW) |
||
| Ventilation rate Q0 (m3/h) |
Lifting head (with powder) Hμt=120℃ (Pa) |
Pure air lift head H0t=120℃ (Pa) |
|||||||||
| FM159.380(S9.10) | 9 | 1590/1010 | 290 | 380 | 1000 | 83.3 | 960.7 | 17000 | 2160 | 2800 | 225 |
| FM219.350(S12.75) | 12 | 2190/1490 | 350 | 350 | 750 | 86 | 1259 | 22000 | 2160 | 2800 | 300 |
| FM220.400(S14.75) | 14 | 2200/1500 | 350 | 400 | 750 | 86.4 | 1452 | 25000 | 2160 | 2800 | 340 |
| FM220.440(S16.75) | 16 | 2200/1500 | 350 | 440 | 750 | 86.4 | 1597 | 28000 | 2160 | 2800 | 380 |
| FM275.480(S20.60) | 20 | 2750/2030 | 360 | 480 | 600 | 86.4 | 2178 | 38000 | 2160 | 2800 | 400 |
| FM275.590(S25.60) | 25 | 2750/1850 | 450 | 590 | 600 | 86.4 | 2677 | 46000 | 2160 | 2800 | 450 |
| FM275.755(S32.60) | 32 | 2750/1850 | 450 | 755 | 600 | 86.4 | 3426 | 59000 | 2160 | 2800 | 700 |
| FM318.644(S36.50) | 36 | 3180/2270 | 454 | 644 | 500 | 83.3 | 3256 | 56000 | 2000 | 2700 | 800 |
| FM340.760(S40.50) | 40 | 3400/2420 | 490 | 760 | 500 | 89 | 4393 | 76000 | 2300 | 3000 | 880 |
| FM340.880(S45.50) | 45 | 3400/2420 | 490 | 880 | 500 | 89 | 5086 | 88000 | 2410 | 3100 | 1000 |
| FM340.970(S50.50) | 50 | 3400/2420 | 490 | 970 | 500 | 89 | 5607 | 97000 | 2480 | 3200 | 1100 |
| FM380.940(S55.50) | 55 | 3800/2644 | 578 | 940 | 450 | 89.5 | 6108 | 106000 | 2480 | 3200 | 1200 |
| FM340.1060(S57.50) | 57 | 3400/2470 | 465 | 1060 | 500 | 89 | 6127 | 106000 | 2480 | 3200 | 1250 |
| FM380.1030(S60.45) | 60 | 3800/2644 | 578 | 1030 | 450 | 89.5 | 6693 | 116000 | 2480 | 3200 | 1300 |
| FM380.1150(S65.45) | 65 | 3800/2644 | 578 | 1150 | 450 | 89.5 | 7473 | 130000 | 2580 | 3300 | 1425 |
| FM380.1200(S70.45) | 70 | 3800/2644 | 578 | 1200 | 450 | 89.5 | 7798 | 135000 | 2560 | 3300 | 1550 |
| FM400.1310(S80.42) | 80 | 4000/2644 | 678 | 1310 | 425 | 89 | 8908 | 154210 | 2560 | 3300 | 1750 |
Remarks:
1. The models listed in the table are basic models. If new models need to be derived, they shall meet the technical requirements of this standard.
2. The value in the rated output column refers to the rated output when the coal quality characteristics of the machine in the design ventilation state are 27% of the total moisture, 34% of the dry ash, 66% of the Hardgrove grindability coefficient, and 48% of the pulverized coal fineness R90.
3. The lift head value in the table is the initial value of impact plate wear (excluding separator).
4. For the source of recommended value, see "Research on the same problem of output of medium speed coal mill and fan mill in large unit" -- <Thermal power generation>. 1995.1
3. Selection method
The model of FM type fan pulverizer is generally selected according to the chart and formula calculation in DL / t5145-2002 "technical specification for design and calculation of coal pulverizing system in thermal power plant", or determined by trial grinding.
If users want to use FM type fan mill, they should provide the following data:
3.1. Coal quality data
The user shall provide the coal quality data of design coal type and check coal type, including:
3.1.1. Industry and element analysis:
3.1.1.1. Total moisture Mt (%).
3.1.1.2. The moisture on air drying basis was Mad (%).
3.1.1.3. As received ash content Aar (%).
3.1.1.4. Dry ash free volatile matter Vdaf(%).
3.1.1.5. As received carbon Car (%)
3.1.1.6. As received hydrogen, Har (%).
3.1.1.7.As received oxygon Oar (%).
3.1.1.8. As received base nitrogen, Nar (%).
3.1.1.9. As received basis total sulfur St, ar (%).
3.1.1.10. As received basis low calorific value Qnet, ar (kJ / kg).
3.1.2. Wear index: 3.1.2
3.1.2.1. Hardgrove grindability index HGI.
3.1.2.2. Wear index Ke
3.2. Coal consumption of boiler under BMCR condition (t/h)
3.3. Drying medium temperature (high temperature flue gas temperature + hot air temperature + low temperature flue gas temperature)
4. Scope of supply
The scope of supply includes product design, procurement, manufacturing, factory testing and providing drawings and operation required for installation and commissioning
Maintenance manual.
4.1. Equipment scope
4.1.1. Expansion joint.
4.1.2. Gate.
4.1.3. Striking wheel.
4.1.4. Casing.
4.1.5. Bearing housing.
4.1.6. Separator (upper and lower sections).
4.1.7. Foundation.
4.1.8. Motor.
4.1.9. Coupling.
4.1.10. Sealing air device.
4.1.11. Thermal insulation filler for gate.
4.1.12. Thermal instruments.
4.2. Special maintenance tools
4.2.1. Static balance device of striking wheel
4.2.2. Fixed bearing disassembly and assembly device
4.2.3. Assembly and disassembly device of floating bearing
4.2.4. Torque wrench
Related products
Online Message