6t/h Small tonnage Chain Grate
Product introduction
The chain belt of the chain-belt grate itself forms the grate surface. The chain is driven by chain wheels, which makes the grate move slowly. The grate plates are usually made of cast iron. After assembly, the necessary ventilation gaps are kept between the grate plates, and independent air chambers with adjustable air volume are usually arranged below the grate, so that air can pass through the gaps into the fuel layer for combustion. 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 finally burnout in sequence. The ash and slag after combustion are 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 while 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 chain grate is a mechanized layer-combustion device, which can be used for boilers with an evaporation capacity of 1-25 t/h and can also be used 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 by this grate shall meet the following requirements:
(1) The maximum particle size of the coal shall not exceed 40mm, and coal fines below 0-5mm are not suitable for burning.
(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 above 1290℃.
(5) The coking tendency should not be too strong.
(6) The net calorific value of the coal should not be greater than 4226kcal/kg.
(7) If the above coal quality requirements conflict with the coal feeding setting, the upper limit value shall be adopted.
The primary air temperature used by this grate shall not exceed 200℃.
Structure and characteristics
Components: 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; 9. side seal.
(1) Simple structure, low metal consumption, large ventilation section ratio; higher strength and performance requirements are placed on the drive shaft, the driven shaft and the grate plates.
(2) Several mutually isolated independent air chambers are arranged along the longitudinal direction inside the grate. After the primary air enters an air chamber, its flow velocity decreases due to diffusion, and it can evenly fill the whole air chamber. 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. The bottom of the air chamber is provided with an ash dropping base plate with an ash dropping opening, and the movable door connected to the ash dropping pull rod normally covers the ash dropping opening. When the ash removal handle is pulled at regular intervals, the ash and slag fall from the ash dropping opening onto the grate chain below, and are then carried by the grate chain to the front end or to the ash receiving hopper near the ash discharge door, and are finally removed manually.
(4) After debugging is completed in the partner factory, the grate can operate normally; it can be shipped as a whole machine, or shipped in separate parts according to user requirements.
Model parameters
| Boiler evaporation capacity | Grate effective area m² | Grate effective width mm | Shaft extension length (to grate centerline) mm | Shaft 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, it has low metal consumption and a simple structure, and is easy to fabricate, install and operate;
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The chain-belt grate operates reliably, burns stably and has wide fuel adaptability, and is widely used in industrial boilers.