Study on Slurry Forming Properties of Coal/Modified Biomass Blending Pulping

Abstract

Abstract: Rice straw is an agricultural waste that is usually utilized by direct burning or landfilled which pollutes the environment. Crushing and blending into coal water slurry can effectively utilize the calorific value of rice straw and protect the environment. Due to its characteristics of strong water absorption, poor grindability, and many pores, it is not conducive for the preparation of good slurry. This paper uses temperature modification to evaluate the slurry performance of the biomass coal water slurry prepared by mixing rice straw and coal powder. The research, comparative analysis of the difference in the pulping performance of the slurry prepared by mixing rice straw before and after the modification, and the effect of the modification temperature and the modification time on the pulping performance of the slurry are summarized. The experimental results show that: the rheological index (n) of the slurry made from unmodified rice straw is the smallest, and the smallest n=0.21. Modification at different temperatures increases the rheological index of the slurry. Modification at 105℃and 200℃did not improve the slurry formation performance. Modification at 250℃and 350℃both increased the slurry concentration of 3g and 5g rice mixture by 3% and 2%, respectively. Moreover, the fluidity of the slurry was B, and the results of rod drop experiment showed that the water separation rate was small and the slurry was soft precipitation. Therefore, the modification effect at 250℃and 350℃is better. Keywords: biomass, coal water slurry, temperature modification, slurry performance