Composite biomass fuel with high ash fusion point and preparation method thereof

The invention relates to a high-ash-fusion-point composite biomass fuel and a preparation method thereof. The composite biomass fuel comprises the following components in percentage by weight: 25-35% of herbaceous biomass, 55-70% of woody biomass, 2-8% of anthracite and 1-5% of a zirconium anti-slagging agent. The preparation method comprises the following steps: (1) slurrying: preparing materials according to the formula of the zirconium anti-slagging agent, adding 0.1% of sodium carboxymethyl cellulose, 0.4% of sodium tripolyphosphate and 50% of water, and carrying out ball milling and slurry discharging to obtain anti-slagging agent slurry; mixing the anti-slagging agent slurry and the coal water slurry according to a ratio of 5: 3, and adding water to regulate the concentration of the mixed slurry to 50%; the herbaceous biomass and the woody biomass are mixed according to the weight percentage of 31: 61, the mixed slurry obtained in the slurrying step is evenly sprayed to the biomass through a high-pressu