Experimental Study On Pine Catalytic Gasification Of The Ni-Zn/Basalt Catalyst

In the era of energy shortage,it is a hot issue to explore new energy and improve energy efficiency.The use of a large amount of easily obtained waste biomass from forests for catalytic gasification reactions to produce hydrogen-rich gas for use as a clean fuel is a hot topic in current extensive research.As far as the research progress in this field is concerned,the main research focus in the field of biomass gasification is to find efficient gasification catalysts to improve the output and calorific value of gasified gas.The main problems in the present research are:unstable performance of catalyst,easy carbon deposition or deactivation,and tar generated in the gasification process is difficult to purify or remove.How to improve catalyst efficiency and remove tar more efficiently is a hot research topic of biomass gasification.Under this premise,this article uses the hydrothermal synthesis method,with basalt fiber as catalyst carrier,Ni additives,zinc as the catalyst,and the preparation of Ni-zinc/basalt compound catalyst,and through the self-built downdraft gasifier experiment platform.The Ni-Zn/basalt composite catalyst was studied under different experimental conditions such as Ni,Zn ion loading,water vapor to biomass mass ratio?ie,gas-to-material ratio,S/B?and gasification reaction temperature to investigate the influence of the gasify biomass components.The thermal stability of the composite catalyst was also investigated.On the above content,this article mainly research work are as follows:?1?A hydrothermal synthesis method was used to load Ni and Zn ions on basalt fiber to prepare a Ni-Zn/basalt composite catalyst.Scanning electron microscopy observation of the catalyst revealed that both ZnO and NiO adhered well on the surface of basalt fiber.NiO was distributed like a net on the surface of basalt fiber and ZnO was distributed like like particle on the surface of basalt fiber.?2?A self-built gasification experiment platform was used to study the catalytic gasification characteristics of pine wood bar by catalyst,and the effects of different Ni and Zn ion loads,gas to material ratio and catalytic gasification temperature on the gasification gas components of biomass were investigated.The results showed that the different Ni and Zn ion loading capacity of the catalyst played a key role in the catalytic activity of the catalyst and had a certain influence on the product and gas components of biomass gasification.When the Ni and Zn ion loading capacity was 10%,the basalt composite catalyst prepared had a good catalytic effect on the gasification experiment.The addition of water vapor was conducive to increasing the hydrogen production rate of biomass gasification gas and reducing the content of hydrocarbon gas in the gasification gas.When the gasification experimental study was carried out under the condition of gas-fuel ratio of 1,it was conducive to the synthesis of hydrogen-rich gas.?3?As a catalyst carrier,the addition of Ni ions made the catalyst show a good catalytic effect on hydrocarbons.With the increase of the gasification temperature,the volume fraction of H₂ increases from 27.55%at 750?to 40.12%at 950?.A large amount of ZnO is formed after the Zn ions are loaded on the surface of the basalt support.The Zn-loaded catalyst can effectively reduce the corrosiveness of tar,reduce the production of phenols and acids in tar and has a strong deoxidization ability.With the increase of gasification temperature,the volume fraction of H₂ increased from 23.55%at750?to 950?in 36.74%,but compared with Ni after load of basalt catalytic effect is weak.?4?The catalyst samples before and after the biomass gasification reaction were observed by scanning electron microscopy.The results showed that when the nickel and zinc ion loading capacity was 10%,NiO and ZnO attached to the basalt fiber surface in large quantities and the adhesion layer was uniform and complete.This was the optimal loading capacity of the basalt composite catalyst.After the high-temperature gasification environment reaction,NiO and ZnO loaded on the surface of basalt fiber skeleton can still maintain their original morphology well after the gasification experiment,but some of the load layers were peeled off,causing adverse effects on the regeneration and reusing of the catalyst.