Study On Kinetics And Technology Of Biomass (Straw) Gas Methanol Synthesis

The research is linked with Henan Provincial Department of Science and Technology Research Project "Studies on Technologies of Methanol Synthesis from Fuel gas (Low Heat Value )of Agricultural Residues". Through the systematic study of "research progresses of biomass methanol synthesis technology", "tests of methanol syngas production from biomass (straw) by the thermochemical method ", "catalytic tests of methanol synthesis from straw biomass ", "technology optimum tests of methanol production from straw syngas ", "kinetic and thermodynamic characteristics tests of methanol synthesis from straw syngas ",data related to methanol synthesis technology of biomass (straw ) gas have been achieved, and the rules concluded. The major achievements are :1. After reading a large number of technical materials , the author made a comprehensive study on the following fields:(1) gasification technology of biomass; (2)technical processes of methanol production from biomass; (3)factors that have impact to biomass gasification process; (4)existing technology methanol syngas production from biomass and current situation of research; (5)catalyst research of biomass for methanol synthesis; (6)Problems occurred in existing gasifiable and catalytic technologies of biomass methanol.2. Purification technologies of cornstalk gas(low heat value) production in the down-flow fixed bed gasifer was experimented, focusing on the desulfurization, deoxy, catalytic cracking of tar, purification, hydrogenation etc. technical processes. Quality straw syngas was produced for methanol synthesis.3. The catalytic test of methanol synthesis for straw syngas over a domestic Cu-based catalyst C301 were carried out in a tubular-flow integral and isothermal reactor under pressure of 5MPa. Through changing some conditions of the synthetic reaction, the author has found the factors that influence CO and CO2 conversion and time space yield of CH3OH. By treatment of experimental data, the rules of the linkage among these factors was obtained.4. The catalytic techniques of methanol synthesis from straw syngas was experimented, focusing on the impact of pressure, temperature, catalyst, catalyst particle size, syngas flow at entering end, compositions of straw syngas on the technical parameters of synthesis, the optimum technology conditions of methanol production from straw syngas was obtained, thestudy provided the scientific and practical basis to the industrial test of methanol production from biomass (straw) gas.5. Dynamical characteristics of methanol synthesis from straw syngas was tested, It established L-H model of the intrinsic kinetics equations and the optimum parameters of the dynamic model equations. The results of statistical test and residue analysis of the model equations showed that the kinetic model equations were highly remarkable. These equations reflect the changing rules of kinetics which straw syngas synthesized methanol.6. Using SHBWR state equation, total reaction heat, equilibrium constants and compositions, which straw syngas synthesized methanol under pressure were researched. It provided basic parameters for design and manufacture of industrial test equipment, which straw syngas synthesized methanol.The paper is purposed on solving the technical problems occurred in high grade and new transforming technology of agricultural residues (cornstalk). The paper is focused on research of basic theories, because the lack of test reports of methanol synthesis used straw as feed gas, it can only refer to research results of methanol synthesis used natural gas coal and so forth as feed gas in experiments. It is unavoidable that experimental methods of this paper are not the best ones. The achievement, however, has provided effective guidance to the industrial test of straw methanol and synthesis equipment design.