System and method for co-producing ammonia electricity by utilizing renewable energy sources

Abstract

The invention provides a system for co-producing ammonia electricity by utilizing renewable energy sources, which is characterized by comprising a renewable energy source power generation system, a liquid air energy storage system, an air separation system and a green ammonia production system, the renewable energy power generation system is connected with the liquid air energy storage system, the green ammonia production system and the power grid through the power distributor and provides electric energy for the liquid air energy storage system, the green ammonia production system and the power grid. The liquid air energy storage system provides raw materials for the air separation system, is connected with the green ammonia production system and the power grid through the power distributor, and can provide electric energy for the green ammonia production system and the power grid when the renewable energy power generation system generates less power; the electric energy of the power grid can be dispatched, and redundant electric power can be provided for the green ammonia production system when a low peak is used; the air separation system is connected with the green ammonia production system and is used for providing nitrogen for ammonia synthesis reaction. The whole system co-produces liquid ammonia and electric energy, and the energy utilization efficiency is improved.

Description

technical field [0001] The invention relates to the technical field of renewable energy utilization, in particular to a system and method for co-producing ammonia and electricity using renewable energy. Background technique [0002] Green hydrogen produced by water electrolysis devices is considered to be a clean energy with zero carbon emissions. Due to the flammability and low density of hydrogen, its transportation and storage still face a series of safety and economic problems. Further reaction of hydrogen and nitrogen to produce green ammonia is a reasonable method of transporting and storing hydrogen, and the process has no carbon emission, safety and environmental protection. However, the key technical bottleneck of high cost and high energy consumption is to directly couple the water electrolysis device with the traditional ammonia production device. There are many limitations in its implementation in the industry, mainly in the following points: [0003] (1) Due t...

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Problems solved by technology

[0003] (1) Low energy utilization efficiency due to inability to deal with the intermittency of renewable energy

The production fluctuation of the device makes it impossible to carry out the high temperature operation of water electrolysis and the application of the latest high-efficiency electrolyzer equipment, that is, the solid oxide electrolysis equipment; in addition, the inconsistent operation between the electrolysis water device and the ammonia production device cannot realize the heat integration between the devices , resulting in lower energy efficiency and higher energy consumption for green ammonia production;

[0004] (2) It is necessary to store a large amount of hydrogen to realize the continuous production of the ammonia synthesis reactor, and the storage of hydrogen is often high-pressure storage; considering the large-scale application and promotion of this process, the storage of a large amount of hydrogen will cause safety hazards and increase production costs

In addition, the frequent start-up and shutdown of various components of the production device due to the fluctuation of renewable energy will also lead to potential operating costs and safety risks;

[0005] (3) This process cannot support production planning and scheduling to consider the real-time needs of the power grid and pipe network side; there are a large number of photovoltaic and wind power curtailment on the actual grid side, and this part of low-cost power curtailment cannot be effectively utilized, resulting in energy waste

However, most of the current liquid air energy storage systems are only applied to the peak load regulation and electric energy storage of a separate power grid. No one has proposed that it can be coupled with green ammonia production to break through the above key technical bottlenecks.

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