چكيده به لاتين
In order to reduce the use of fossil fuels to minimize its adverse consequences such as global warming, we must look for ways to produce suitable and alternative fuels. One of the suitable sources for alternative fuel production is biomass, which has various sources such as agricultural residues, types of wood, forest plant residues, etc. Pyrolysis is one of the suitable methods to convert these materials into fuel. Depending on the type of feed and operating conditions, the fuel obtained from pyrolysis of biomass has unfavorable characteristics that are needed to overcome these disadvantages of certain processes. The simulation of these processes gives a worthy contribution to the industry. In this research, the simulation of pyrolysis of pine wood was done by Aspen Plus software. This biomass enters the process with an amount of 80 kg/h. The initial feed had 50% by weight of moisture, which was reduced to 8% by weight before pyrolysis. The screw reactor was considered as a pyrolysis reactor and was simulated by RYield reactor in the software. The pyrolysis process was simulated at a temperature of 450 degrees Celsius and atmospheric pressure, and then the process of separating solid products from pyrolysis gas and improving the quality of the products was also simulated. Finally, it was observed that the desired biofuel efficiency based on dry feed is 19.95%. In other words, for 80 kg of pine wood with an initial moisture content of 50% by weight, 7.98 kg of biofuel was produced, the share of light component was 4.62 and the share of heavy component was 3.36 kg. The weight percentage of compounds such as phenol, dextrose, and vanillin decreased from 8.03, 25.28, and 6.01 to zero, 0.2, and zero, respectively, during the upgrading process. The error rate between the simulation results and the desired reference for process validation was 1.52% for biofuel, 0.1% for non-compressible gases and 7.4% for coke and coal. After the validation, another study case was simulated, the pyrolysis temperature of which was 500 degrees Celsius, and in which pine wood with a moisture content of 50 percent by weight was entered into the process, and the yield of the resulting biofuel was equal to 24.06 percent based on dry feed. became. The error rate between the present simulation results and the experimental data of this case study was 10.8% for biofuel. It was observed that by increasing the initial moisture content from 10 to 50% by weight, the efficiency of biofuel should decrease from about 35 to 19.95% by weight based on dry feed. The innovation carried out in this research was the conversion of the GC-MS experimental data available in the sources into weight percentage and yield distribution.
