System and method for preparing high-calorific-value gas by using biomass

Abstract

The invention discloses a system for preparing high-calorific-value gas by using biomass, belonging to the field of related biomass utilization technologies. The system comprises a pyrolysis device, acatalytic device and a heating device. According to the invention, volatile matters undergo catalytic reforming by a semi-coke catalyst in a primary catalytic device so as to obtain primary gas, thenthe primary gas is sent to a secondary catalytic device, and a nickel-based catalyst is used for catalytic reforming of the primary gas again so as to produce the high-calorific-value gas; and the heating device supplies heat to the system through high-temperature flue gas generated by the combustion of the deactivated semi-coke catalyst. In addition, the invention also discloses a correspondingprocess. According to the invention, since two-step catalysis is performed on the volatile matters obtained by pyrolysis, the catalytic efficiency and the service life of the nickel-based catalyst areimproved and external energy supply is not needed, so the system has good economic performance and low operation cost; meanwhile, high-temperature flue gas generated by combustion supplies heat onlythrough an independent flue gas heat exchange system, so the generated gas is free of impurity gas and has a high calorific value.

Description

technical field [0001] The invention belongs to the technical field related to biomass utilization, and more specifically relates to a system and method for preparing high calorific value gas from biomass. Background technique [0002] With the development of society and the improvement of environmental protection requirements, a large amount of waste biomass produced by agriculture and forestry needs to be treated. Therefore, how to realize the utilization of biomass resources efficiently and with low pollution has become a major problem to be solved urgently. [0003] Biomass, as a clean and renewable energy source, can be utilized quickly and efficiently by thermochemical means, among which the catalytic reforming of volatile matter in the pyrolysis process is one of the important ways to produce gas. In existing catalytic reforming systems, nickel-based catalysts have high catalytic activity and are widely used. However, since the non-catalytic components (such as arom...

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Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a system and method for producing high calorific value fuel gas from biomass, in which the structure and arrangement of key components such as pyrolysis equipment and catalytic equipment are improved, Correspondingly, it can solve the problem of nickel-based catalyst deactivation, and at the same time can improve the purity and calorific value of gas, so it is especially suitable for the application of biomass catalysis to prepare gas

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