A method and equipment for preparing synthesis gas by autothermal reforming of biogas with double risers

Abstract

The invention discloses a method and equipment for preparing synthesis gas by self-thermal reforming of biogas with double risers. The method comprises the steps of: first performing desulfurization treatment on the biogas, and then mixing with the gas delivered at the outlet of the riser regenerator in the riser reforming reactor ; The mixed gas is reformed by catalyst in the riser reforming reactor to generate synthesis gas; the reacted synthesis gas is output as a product; the deactivated catalyst after the reaction enters the riser regenerator, and the riser regenerator The oxygen reacts for regeneration; the charred gas in the riser regenerator is sent to the riser reforming reactor, and the regenerated catalyst is sent to the riser reforming reactor. The invention realizes the cycle of catalyst reaction and deactivated catalyst regeneration through the reaction-regeneration system composed of double risers, and solves the problem of catalyst deactivation caused by coking; the heat released by combustion can heat the catalyst to provide part of the heat for the reforming reaction, and maintain the reforming reaction. The lack of heat for the whole reaction solves the problem of energy consumption in the process.

Description

technical field [0001] The invention relates to the field of energy, in particular to a method and equipment for preparing synthesis gas by autothermal reforming of biogas with double risers. Background technique [0002] With the increasing demand for energy from social development and the depletion of fossil energy, the development of renewable energy to replace fossil energy has become a hot topic worldwide. Biomass energy, as the only carbon-containing renewable resource that can be used to produce liquid fuels on a large scale, has become a current research hotspot. [0003] China is a large agricultural production country with rich agricultural biomass resources. According to statistics, more than 700 million tons of crop straw, 160 million tons of abandoned forest trees, and 1.8 billion tons of livestock and poultry manure are produced every year, with a total of more than 3 billion tons of agricultural biomass resources. Biogas is considered to be "the most feasible...

AI Technical Summary

Problems solved by technology

The steam reforming of biogas has been industrialized, but due to the participation of water vapor, the H in the product 2 The volume ratio of / CO is close to 3, which is not conducive to the synthesis of downstream products; the research focus of biogas dry reforming is to improve the stability of the catalyst based on the fixed bed process and the mechanism of catalyst deactivation. Since this reaction is a strong endothermic reaction, The heat supply problem of the reaction system will definitely become the bottleneck in the scale-up process of this technology in the future; in order to solve the heat supply problem of the system, researchers have begun to devote themselves to the development of a hybrid reforming process, which introduces oxygen into the reaction system and utilizes the energy of combustible components. Combustion provides heat for the reforming reaction, but the introduction of oxygen easily interacts with the H in the product 2 It reacts with CO and affects the composition of syngas. In addition, the reforming and combustion reactions are carried out in a reactor, which has the risk of explosion

In recent years, plasma has been applied in biogas reforming to produce syngas. Among them, hot plasma has the characteristics of high enthalpy, high temperature, and high density of high-energy particles. Compared with cold plasma, it is more suitable for industrial scale-up production, but this technology is still In the initial stage of laboratory research, how to improve the energy conversion efficiency of thermal plasma generators and rationally design the plasma reactor structure suitable for biogas reforming is the key to realize the industrial application of plasma reforming technology

[0008] Through the analysis of various technologies under research, it can be found that the main technical reasons for the failure of biogas reforming technology to achieve large-scale industrial production are the problems of catalysts that are prone to carbon deposition, resulting in decreased activity and high energy consumption in the process.

Images