Renewable energy synthesis ammonia device and method

Abstract

The invention provides a device and a method for synthesizing ammonia by utilizing renewable energy sources, and relates to the technical field of ammonia synthesis. The device provided by the invention comprises an energy microgrid 1, a water electrolysis hydrogen production device 2, an air separation device 3, a first buffer tank 4, a first compressor 5, a second buffer tank 6, a third buffer tank 18, a heat exchanger 7, a reaction tower 8, a first adsorption column 17, a second adsorption column 11, a third adsorption column 20, a first flash tower 10, a second flash tower 14, a third flash tower 15, a liquid ammonia pump 16, a second compressor 12 and valves. According to the invention, the energy microgrid is used for providing a renewable energy source for hydrogen production by water electrolysis and nitrogen production by air separation, then the prepared hydrogen and nitrogen are mixed and then subjected to a synthetic reaction, and the generated high-temperature outlet gas is subjected to adsorption separation again after flash evaporation, condensation and separation, so that ammonia is obtained. The method can realize production of carbon-free ammonia, and the method combining adsorption separation and condensation separation can improve the nitrogen-hydrogen conversion rate and the ammonia synthesis rate in the ammonia synthesis reaction.

Description

technical field [0001] The invention relates to the technical field of ammonia synthesis, in particular to a device and method for synthesizing ammonia from renewable energy. Background technique [0002] Ammonia is one of the most important chemicals in the world, which can be used in fertilizer and fiber production, refrigeration and other fields, or as a clean fuel. [0003] Traditional ammonia synthesis methods use coal, natural gas and other chemical energy sources. my country's ammonia synthesis is mainly based on coal, which has high carbon emissions and heavy pollution. It is of great significance to find a clean way to synthesize ammonia. At the same time, my country's new energy is developing rapidly, but because renewable energy power stations are mostly built in remote areas, the power consumption is less, and the speed of power grid construction lags behind the speed of power supply construction, resulting in excess power generation capacity; in addition, its po...

AI Technical Summary

Problems solved by technology

However, using the adsorption method alone to separate ammonia requires frequent switching of the adsorption column, and the adsorption performance of the adsorbent decreases with the increase in the number of adsorption and desorption cycles, resulting in an increase in the ammonia content in the reflux gas, which seriously affects the conversion rate of nitrogen and hydrogen and the rate of ammonia synthesis.

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