1t/h Chain Belt Type Grate
Product introduction
In the chain-belt type grate, the chain belt itself forms the grate surface. The chain is driven by the sprockets, so that the grate moves slowly. The grate plates are usually made of cast iron. After assembly, the necessary ventilation gaps are maintained between the grate plates, and independent air chambers with adjustable air volume are usually arranged under the grate, so that air can enter the fuel layer through the gaps for combustion. The coal falls evenly onto the grate from the coal hopper at the front end of the grate, and the thickness of the coal seam is adjusted by raising and lowering the coal gate.
As the grate moves backward, the coal seam completes ignition, combustion and final burnout in sequence. The ash after combustion is discharged manually or mechanically. There is also a mode in which no coal hopper is used for coal feeding; instead, a coal spreader throws the coal to the rear part of the grate and the grate moves forward. The moving speed of the grate is adjusted through gear transmission according to different coal types and boiler loads.
Applicable scope and requirements
Scope of application
The chain-belt type grate is a mechanized layer-combustion device, which can be used for boilers with an evaporation capacity of 1-25 t/h, and also for various heating and drying equipment. It is suitable for burning bituminous coal, lignite and peat. After special design, it can also serve as biomass fuel combustion equipment burning raw materials such as bagasse, wood and rice husk.
Use requirements
The coal quality burned in this grate shall meet the following requirements:
(1) The maximum particle size of the coal shall not exceed 40mm, and it is not suitable to burn coal fines below 0-5mm.
(2) The moisture content of the coal shall be less than 20%, preferably 8-10%.
(3) The ash content of the coal shall not exceed 30% but shall not be lower than 10%, and the volatile matter content shall not be lower than 20%.
(4) The ash melting point temperature of the coal shall be higher than 1290℃.
(5) The coking tendency should not be too strong.
(6) The net calorific value of the coal should not be higher than 4226kcal/kg.
(7) If the above coal quality requirements conflict with the coal feeding arrangement, the upper limit value shall be taken.
The primary air temperature used in this grate shall not exceed 200℃.
Structure and characteristics
Component parts: 1. drive shaft; 2. driven shaft; 3. support frame; 4. ash removal device; 5. air regulating device; 6. grate chain; 7. coal hopper; 8. front air baffle plate; 9. side seal.
(1) Simple structure, low metal consumption and a large ventilation cross-section ratio; the drive shaft, the driven shaft and the grate plates are subject to higher strength and performance requirements.
(2) Several mutually isolated independent air chambers are arranged longitudinally inside the grate. After the primary air enters an air chamber, its flow velocity decreases due to diffusion and it can fill the whole chamber uniformly. The air supply of each air chamber can be adjusted through the air regulating device.
(3) Each air chamber is equipped with an ash removal device. At the bottom of the air chamber there is an ash drop base plate with an ash drop opening, and a movable door connected to the ash drop pull rod normally covers the ash drop opening. When the ash removal handle is pulled at regular intervals, the ash falls from the ash drop opening onto the grate chain below, and the grate chain carries it to the front end or into the ash receiving hopper near the ash discharge door, where it is finally removed manually.
(4) The grate can operate normally after commissioning at the partner factory; it can be shipped as a whole unit, or shipped separately as required by the user.
Model parameters
| Boiler evaporation capacity | Effective grate area m² | Effective grate width mm | Shaft extension length (to grate centerline) mm | Shaft extension end diameter mm | Number of air chambers |
|---|---|---|---|---|---|
| 1 t/h | 2.68 | 980 | 767 | Φ60 | 4 |
| 2 t/h | 3.84 | 1030 | 783 | Φ60 | 4 |
| 4 t/h | 5.39 | 1400 | 980 | Φ60 | 5 |
| 6 t/h | 7 | 1400 | 1015 | Φ80 | 5 |
| 8 t/h | 9.9 | 1960 | 1235 | Φ80 | 6 |
| 10 t/h | 11.65 | 2330 | 1662 | Φ100 | 5 |
| 15 t/h | 18.99 | 2890 | 1880 | Φ100 | 6 |
| 20 t/h | 22.6 | 3440 | 2205 | Φ120 | 6 |
Operating features
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Compared with other chain-belt grates, the metal consumption is low, the structure is simple, and manufacture, installation and operation are convenient;
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The chain-belt grate runs reliably, burns stably and has wide fuel adaptability, and is widely used in industrial boilers.