Biomass pellet fuel is a green fuel produced by the compression of a biomass pellet mill. Durability is an important performance indicator for evaluating the quality of a biomass formed fuel, and generally includes the resistance to degradation, deformation resistance, water impermeability And anti-hygroscopic several indicators.
Durability
The durability of biomass briquette affects the packaging, transportation and storage performance of biomass briquette.At present, there is no uniform standard to test methods and evaluation indexes of briquette performance of biomass briquette.Put samples can be used to judge the biomass briquette Durability meets packaging, shipping and storage requirements.
In this test, referring to the method commonly used by current researchers, the sample of formed fuel is placed on T25mm surface at a water temperature of 27 ° C, and the morphology of the formed fuel is continuously observed until the formed fuel completely peels off to decompose, so as to maintain the complete state of the shaped fuel in water As a technical indicator for evaluating the water resistance of shaped fuels, each sample was recorded 5 times and averaged.
Resistant to fragility
The resistance to fragmentation mainly reflects the ability of the biomass-shaped fuel to withstand some drop and tumble collision during handling and reflects the transportation requirements of the biomass-shaped fuel under actual conditions.
Biomass-forming fuels can lose weight due to a drop during transport or movement, and the percent remaining mass (ie, the difference between the total mass and the loss divided by the total mass) after the molding fuel falls reflects the size of the product .
Fragmentation resistance of molded fuels was measured by reference to the crushing strength measurement of coal. Fuel rods having a length of 60 to 100 mm were allowed to freely fall from a height of 2 m onto a hard floor, and then fuel falling in fuel rods larger than 25 mm The rods fall down again a total of three times to show the mass percentage of the fuel rods that are greater than 25 mm after crushing as the percentage of the original fuel rods and represent the resistance to the crushing strength of the fuel rods.
Anti-deformation
Deformability mainly reflects the ability of biomass-forming fuels to withstand rupture under the conditions of external pressure and determines the requirements for the use and storage of biomass-based fuels.
When biomass fuel is piled up, it must withstand a certain pressure, and its bearing capacity reflects the capability of deformation resistance of biomass briquette, and the maximum pressure of deformation and rupture of biomass briquette fuel sample under continuous loading Sample record 5 times, whichever is greater.
Water resistance, anti-hygroscopicity
Water permeability and anti-hygroscopicity respectively reflect the seepage ability of biomass forming fuel and the ability of absorbing air moisture, and the percentage of weight gain reflects the capacity of anti-hygroscopicity, which determines the storage performance of biomass forming fuel.
The test method is to put the molding fuel in a closed environment with a relative humidity of 100% and observe the change in its mass. In the preliminary test, it has good deformation resistance and hygroscopic resistance to the molding fuel with good relaxation density The accumulation of molding fuel at a height of about 2.5 meters, the bottom of the molding fuel deformation did not occur, and in the mechanical properties of the test machine found that its ability to deformation resistance is very strong.For the anti-hygroscopicity, the preparation of the test method The molding fuel is placed in a closed environment with a relative humidity of 100%, and the measurement is observed once a day.
'Biomass briquette fuel' has high calorific value, and its use cost is far lower than petroleum energy. It is a clean oil generation oil advocated by the country and has a vast market space.
