Method for producing synthetic gas by natural gas conversion

Abstract

The invention discloses a circulating fluidized bed technology-based oxygen carrier thermo-chemical circulation process aiming at the purpose of producing synthetic gas by natural gas scale conversion. Natural gas is introduced at the inlet of a reforming reactor of a circulating fluidized bed at a certain speed, the natural gas captures lattice oxygen of oxygen carriers in the reforming reactor, and the generated synthetic gas (H2 and CO) can be used for preparing liquid fuel by Fischer-Tropsch synthesis after heat exchange of a heat exchanger and purification; and meanwhile, the oxygen carriers losing the lattice oxygen rise along with airflow and drop and return to an oxygen carrier regenerating reactor to react with an oxygen source such as H2O, air or CO2 and the like introduced from the bottom so as to recover the lattice oxygen thereof, the generated H2, N2 and CO airflow take the regenerated oxygen carriers out of the regenerating reactor and drop the oxygen carriers to the reforming reactor, and the H2, N2 and CO are discharged from the top and used as products through heat exchange of the heat exchanger and purification. The oxygen carriers are circularly used in two reaction areas of the circulating fluidized bed. The technology provides an important path for producing the synthetic gas by the natural gas scale conversion.

Description

technical field [0001] The invention relates to the technology of producing synthesis gas by converting natural gas, aims at the technology of producing synthesis gas by large-scale conversion of natural gas, and belongs to the field of energy catalysis. technical background [0002] More than 85% of the world's energy and chemical industries are based on the three combustible mineral resources of oil, coal and natural gas. Among these three pillar energy sources, oil resources are increasingly depleted and prices are rising. Although coal resources are abundant , but the pollution is serious when used, which poses a serious challenge to environmental protection. As a high-quality clean energy and chemical raw material, natural gas is expected to play a more important role in the modern economy. The world's proven natural gas reserves are 181 trillion cubic meters, and the prospective reserves are 250-350 trillion cubic meters. my country's natural gas prospective reserves r...

AI Technical Summary

Problems solved by technology

The steam reforming reaction is a strong endothermic process. Although it has been industrialized, it has the disadvantages of high energy consumption, large and complex equipment, and expensive operating costs; the carbon dioxide reforming process is in the research stage; the catalytic partial oxidation reaction temperature is high, and The mixed gas of methane and oxygen has the risk of explosion, and it is difficult to achieve industrial scale-up; the lattice oxygen partial oxidation method overcomes the problem that methane and oxygen are fed at the same time and is prone to explosion, and the oxygen carrier lattice oxygen can be regenerated by other oxygen sources, and at the same time Obtaining other by-products can greatly reduce the production cost of syngas. At present, the reaction devices to ensure the smooth progress of this technology are under development all over the world, and large-scale conversion is still a research hotspot.

Images