Methanol Synthesis Load Decoupling for Variable Hydrogen Supply
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Solution Overview
Problem
Methanol production plants face shutdowns due to fluctuations in hydrogen supply from renewable energy sources, as the methanol synthesis reactor and downstream processing units have different adaptability limits, leading to mechanical stress and inefficiencies in hydrogen storage.
Innovation Solution
Decouple the synthesis cycle from downstream processes by operating at partial load or standby mode, adjusting stoichiometry, and using crude methanol storage to supplement production, combined with measures like inert gas injection and isothermal control to maintain reactor conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If hydrogen supply fluctuates due to renewable energy sources, then adaptability to variable feedstock is improved, but shutdowns occur when hydrogen quantity falls below threshold
Solution Approach 1:
The patent applies preliminary action by storing crude methanol in advance during periods of high hydrogen supply (first operating mode) to bridge future shortages. The crude methanol storage facility accumulates product before hydrogen becomes insufficient, enabling continuous operation during low-supply periods without shutdown.
Solution Approach 2:
The patent introduces crude methanol as an intermediary substance between hydrogen supply and methanol processing plant operation. Instead of directly linking hydrogen availability to plant operation, crude methanol serves as a buffer medium that decouples the two, allowing the processing plant to maintain steady operation even when hydrogen supply fluctuates.
2Loss of energy
If methanol processing plant operates at partial load, then energy consumption is reduced, but mechanical stress increases and inefficiencies occur
Solution Approach 1:
The patent applies dynamics by enabling flexible switching between operating modes based on hydrogen availability. The methanol processing plant can operate continuously at optimal load conditions while the synthesis cycle dynamically adjusts its hydrogen consumption rate, allowing the plant to avoid mechanical stress from partial-load operation while still adapting to variable hydrogen supply.
3Reliability
If hydrogen is stored to bridge supply gaps, then continuous operation is maintained, but hydrogen storage requires large-scale facilities and incurs costs
Solution Approach 1:
The patent applies copying by storing crude methanol (an intermediate product) instead of storing hydrogen itself. This substitute storage approach uses existing crude methanol infrastructure rather than requiring new large-scale hydrogen storage facilities, achieving the same continuity goal with simpler, already-available equipment.
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
Enables continuous operation of the methanol processing unit at partial loads below the minimum threshold, reducing mechanical stress and allowing rapid load adjustments, thus avoiding unscheduled shutdowns and maintaining product quality.
Implementation Method 1
with catalytic assistance, converted in a methanol synthesis reactor under high pressure (5 to 10 MPa) and moderate temperatures (200 to 300°C) to a synthesis product containing methanol, water, and significant amounts of hydrogen and carbon oxides. Catalysts based on copper, zinc oxide, and aluminum oxide are commonly used
Implementation Method 2
To separate methanol and water by condensation and obtain crude methanol and the recyclable gas, which consists largely of hydrogen and carbon oxides, the synthesis product is cooled.
Data Source
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AI summary
The invention relates to a process and a plant for the production of methanol, in which hydrogen (101a) is provided in a first operating mode with a flow rate above a threshold value and is introduced together with carbon dioxide (101b) as fresh feed (101) into a synthesis cycle to form a synthesis feed (103) comprising hydrogen and carbon dioxide, from which a synthesis product (106) containing hydrogen, carbon dioxide, methanol and water is produced in a methanol synthesis reactor (40), which is separated into a hydrogen and carbon dioxide-containing recycling gas (102) for the formation of the synthesis feed (103) and crude methanol (107) containing methanol and water, from which a methanol product (117) is subsequently produced in a methanol processing plant, wherein the hydrogen (101a) is provided in a second operating mode with a flow rate below the threshold value, which is insufficientto produce sufficient crude methanol (107) to maintain the operation of the methanol upgrading plant (210). A key feature is that a portion (115) of the crude methanol (107) produced in the first operating mode is fed into a crude methanol storage tank (90), from which crude ethanol is drawn in the second operating mode to supplement the produced quantity of crude ethanol to such an extent that crude ethanol (116) is obtained in a quantity required for the operation of the methanol upgrading plant.