wood briquette press machine
In furniture factories or other woodworking plants, there are plenty of waste wood produced every day. If not made use of, the waste wood pieces, chips or sawdust will remain worthless. But as a matter of fact, these waste woods are great fuel sources. One of the best ways to take their advantages is to make them into briquettes by briquette press machine.
The GCBC screw briquette press machine is used to press crushed wood powder into high density hexogen sticks with hole in center.
The forming principle of briquette press machine:
All biomass contains large proportion of lignin and cellulose. The lignin itself has no melting point but it has softening point. When temperature reaches 120-160℃, the hot-water-soluble substance in lignin will melt, while at 180℃, lignin will soften and reshape. Under such condition, if some pressure is exerted onto the biomass, the lignin and cellulose inside will adhere each other and bond tightly. This is how biomass briquette is extruded by heating.The forming conditions of briquette press machine:
Although we can utilize such biomass forming principle, it is realized under certain conditions. Since different biomass raw materials have different moisture content, volume and relative density, the requirement of forming conditions are not the same and their processing technologies vary.1. Raw material moisture content: it greatly influences the briquetting process and briquettes quality. If moisture content is too high, the heating procedure will generate too much vapor which cannot smoothly be excluded through the middle hole of briquettes. As a result, the briquettes surface will crack, sometimes briquettes cannot form. But if the moisture content is too low, briquettes also won’t form, since certain amount of moisture will promote lignin soften. So the best moisture content for briquetting is 6-12%.
2. Forming temperature: it affects the briquette making speed, density, appearance and quality. Therefore, the temperature must be adjusted to meet the raw material, so as to guarantee the quantity and quality of briquettes. If the temperature is too low, it cannot soften the lignin, as a result cause blockage to the extruding drum; if too high, the biomass will severely decompose, which will cause briquette surface carbonization or even can’t form briquettes.
By Shirley Wang
