Water vapor electrolytic process based system for joint production of ammonia and nitric acid

Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to a water vapor electrolytic process based system for joint production of ammonia and nitric acid. The system comprises a nitrogen generation unit, an ammonia synthesis unit, a nitric acid generation unit, and a solid oxide electrolyzer. The ammonia synthesis unit is used to provide the material ammonia and process vapor for the nitric acid generation unit, no ammonia is externally purchased for the nitric acid generation unit, meanwhile, a heat recovery boiler is eliminated. The reaction heat of the ammonia synthesis unit and the nitric acid generation unit is used to produce high temperature vapor, the high temperature vapor is applied to the solid oxide electrolyzer, the solid oxide electrolyzer produces hydrogen and oxygen, the hydrogen and the oxygen are applied to the ammonia synthesis unit and the nitric acid generation unit, so that a mode of joint production of ammonia and nitric acid by taking air and water as raw materials is achieved, no materials or fuels are externally purchased, only electric energy is used, so that the system has the characteristics of high integration, low production cost, single and convenient energy consumption, reasonable recovery of energy, less environment pollution, conformity to the international emission standard and the like, and has an excellent economic benefit and an excellent application prospect.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a system for jointly producing ammonia and nitric acid based on a steam electrolysis method. Background technique [0002] Synthetic ammonia is a basic chemical raw material, which can be used to produce dyes, pharmaceuticals, synthetic fibers and synthetic resins, etc. It is also a raw material for the nitric acid industry. The production of synthetic ammonia and nitric acid ranks first in the world. Since the ammonia synthesis process and the nitric acid production process are relatively complicated at the present stage, and there is no correlation between the two processes, an independent ammonia synthesis enterprise and a nitric acid enterprise are formed respectively, and the ammonia synthesis enterprise provides the raw material ammonia for the nitric acid enterprise. In recent years, with the growth of downstream demand such as metallurgy and medicin...

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Problems solved by technology

This method requires two compressors, which are respectively driven by the tail gas turbine and the medium-pressure steam turbine, and the medium-pressure steam is provided by the waste heat boiler arranged at the outlet of the oxidation furnace. The steam temperature of the waste heat boiler (about 300~400°C) does not match, which causes serious depreciation and utilization of high-grade heat energy at the outlet of the oxidation furnace, resulting in a large energy loss

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