Ammonia Synthesis Circuit Segmentation for Pressure Limits
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Solution Overview
Problem
Current methods for producing ammonia from synthesis gas face limitations in capacity expansion due to high working pressures and temperatures, requiring technological changes to overcome construction limits in single-train plants, and existing methods for interconnecting synthesis circuits are not optimal for maximizing yield.
Innovation Solution
A hybrid method and apparatus that divides the synthesis gas into partial streams, with one stream fed to a first synthesis circuit and the other to a second circuit, allowing for sequential and parallel connections, enabling all reaction gas to be fed to an ammonia synthesis unit in each circuit, and discharging a purge gas stream only after the second synthesis cycle, thereby optimizing ammonia production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the capacity of closed-loop syntheses is increased by operating at higher pressures and temperatures, then productivity is improved, but the construction limits of pressure vessels and piping are exceeded
Solution Approach 1:
The patent divides a single large-scale synthesis loop into multiple smaller synthesis loops operating in parallel. Each loop operates at moderate pressures (200-300 bar) within construction limits, while the combined capacity of multiple loops achieves the desired high productivity. This segmentation allows existing pressure vessel technology to be utilized effectively without exceeding material strength limits.
Solution Approach 2:
The patent implements a hierarchical structure where multiple synthesis loops are nested within a larger plant configuration. Each synthesis loop contains its own compressor, heat exchangers, and separation systems, while sharing common infrastructure at the plant level. This nested arrangement enables scalable capacity expansion while maintaining manageable pressure levels in each individual loop.
2Productivity
If multiple synthesis cycles are interconnected to maximize yield, then productivity is improved, but the device complexity increases
Solution Approach 1:
The patent segments the synthesis system into identical, modular loops that can be independently configured and operated. Each loop is a self-contained unit with standardized components, simplifying the interconnection strategy. The modular design reduces complexity by allowing replicate units rather than requiring unique custom configurations for each synthesis cycle.
Solution Approach 2:
The patent designs synthesis loops with universal, multi-functional components that can serve multiple purposes. Heat exchangers, compressors, and separation systems are configured to handle various gas streams and operating conditions within each loop, reducing the need for specialized equipment and simplifying the overall system architecture.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach enhances ammonia production capacity by ensuring all reaction gas is utilized efficiently across both synthesis circuits, leading to increased overall yield and productivity while managing pressure and temperature constraints.
Implementation Method 1
fed into a closed loop that passes through one or more catalyst-filled reactors where ammonia is produced
Data Source
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AI summary
The invention relates to a method and a device for producing a product, in particular ammonia, from synthesis gas by means of a mixed circuitry consisting of two sequential synthesis circuits which are operated at a virtually identical pressure level and also work in parallel with each other. According to the invention, a recirculated circuit gas (B) from a first synthesis circuit is mixed with fresh synthesis gas (A) and then divided into two sub-flows (D) and (E) upstream of a first ammonia synthesis unit (4), wherein the second sub-flow (E) is transferred into a second synthesis circuit, mixed there with a recirculated circuit gas (H) from the second synthesis circuit, and fed to a second ammonia synthesis unit (7).