System and method for simultaneously preparing ammonia synthesis gas and liquid fuel synthesis gas

Abstract

The invention provides a system and a method for simultaneously preparing ammonia synthesis gas and liquid fuel synthesis gas. The system comprises a solid electrolysis cell, a catalyst module I, a catalyst module II, a gas induction device I, a gas induction device II, a mixture of steam and air, and natural gas; the solid electrolytic cell comprises a cathode, an electrolyte layer, an anode and a current collecting layer; the catalyst module I is loaded in the cathode and the catalyst module II is loaded in the anode; the gas induction device I is used for introducing ammonia synthesis gas virgin gas to the cathode side of the solid electrolysis cell; the gas induction device II is used for introducing liquid fuel synthesis gas virgin gas to the anode side of the solid electrolysis cell; the mixture of the steam and the air acts as the ammonia synthesis gas virgin gas; and the natural gas acts as the liquid fuel synthesis gas virgin gas. With the adoption of the system and the method, the ammonia synthesis gas and the liquid fuel synthesis gas can be prepared simultaneously and efficiently in the solid electrolysis cell, the operation and the devices are very simple, procedures for preparing the ammonia synthesis gas and the liquid fuel synthesis gas are reduced substantially, nine steps in two complicated chemical processes are coupled to be one step, and a lot of resources and energy sources are saved.

Description

technical field [0001] The invention relates to a system and method for simultaneously preparing ammonia synthesis gas and liquid fuel synthesis gas, in particular to a system and method for simultaneously preparing ammonia synthesis gas and liquid fuel synthesis gas directly in a solid oxide electrolytic cell. [0002] technical background [0003] The synthetic ammonia industry is one of the most important basic industries in the world and plays an important role in the national economy. In the ammonia synthesis process, the ammonia synthesis gas (H 2 / N 2 =3) The hydrogen mainly comes from natural gas mainly composed of methane. The traditional process of preparing ammonia synthesis gas has many steps, consumes a lot of energy and emits a large amount of greenhouse gas carbon dioxide. Desulfurized natural gas needs to go through seven steps to obtain ammonia synthesis gas. The energy consumption of these seven steps accounts for 84% of the energy consumption of the enti...

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Problems solved by technology

It has been reported that the air separation process can be efficiently coupled with the partial oxidation of methane by using an oxygen-permeable membrane reactor, but the coupling reaction is an exothermic reaction, and there is a risk of overheating when it is scaled up. In addition, once the membrane ruptures, it will risk of explosion

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