Methanol Synthesis Loop Buffering for Variable Feed Gas Pressure
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Solution Overview
Problem
Conventional methanol synthesis plants struggle with pressure fluctuations due to fluctuating hydrogen supply from renewable energy sources, leading to potential damage of equipment, especially the catalyst, and cannot operate efficiently under alternating load conditions without excessive stress.
Innovation Solution
Integrate an auxiliary volume into the piping system that adjusts its gas-accessible volume based on a liquid level to stabilize pressure by increasing the liquid level during feed gas flow reductions, using methanol produced in the reactor or from an external storage, to maintain consistent pressure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional methanol plants operate under variable load conditions to account for renewable energy availability, then adaptability improves, but equipment stress increases disproportionately
Solution Approach 1:
The patent applies beforehand cushioning by providing a buffer volume that compensates for pressure fluctuations before they reach the synthesis loop equipment. The buffer volume absorbs pressure spikes and maintains stable pressure conditions, protecting the catalyst and equipment from stress during variable load operation while enabling flexible response to renewable energy availability
2Loss of energy
If feed gas flow rate is reduced to match lower renewable energy availability, then energy waste decreases, but pressure drops and damages equipment
Solution Approach 1:
The buffer volume provides beforehand cushioning by maintaining stable pressure in the synthesis loop even when feed gas flow rate is reduced. This allows the system to operate at lower loads to match renewable energy availability without causing pressure drops that would damage equipment, thus reducing energy waste while protecting equipment safety
3Stability of the object's composition
If rapid pressure adjustments are made to respond to feed gas flow fluctuations, then pressure stability improves, but catalyst damage increases
Solution Approach 1:
The buffer volume provides beforehand cushioning that stabilizes pressure in the synthesis loop without requiring rapid adjustments. By absorbing pressure fluctuations at the buffer volume, the system maintains pressure stability while avoiding the rapid pressure changes that would otherwise damage the catalyst
4Strength
If partial load operation is implemented slowly over hours or days, then equipment stress is protected, but productivity loss increases
Solution Approach 1:
The buffer volume enables rapid load changes by providing beforehand cushioning that protects equipment from stress. This allows the system to transition quickly between different load levels to match renewable energy availability, significantly reducing the productivity loss associated with slow transitions while still protecting equipment through the buffer volume's pressure stabilization
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
The method effectively stabilizes pressure in the synthesis loop, reducing equipment stress and enabling flexible operation even with fluctuating feedstocks, particularly suitable for small to medium-sized plants.
Implementation Method 1
an auxiliary volume is integrated into the piping system such that a gas-accessible volume of the piping system depends on a liquid level in the auxiliary volume, and wherein the liquid level in the auxiliary volume is increased at least in one case of a reduction in the volumetric flow rate of the feed gas stream
Data Source
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AI summary
A process for the synthesis of methanol using a piping system (4) in which a raw gas source (7), a methanol synthesis reactor (2) and a separation device (3) are integrated, wherein a feed gas stream comprising reactants for the methanol synthesis is supplied from the raw gas source (7) to the methanol synthesis reactor (2) at a volumetric flow rate, wherein methanol is produced in the methanol synthesis reactor (2) with the reactants, wherein the produced methanol is separated from an outlet stream of the methanol synthesis reactor (2) by the separation device (3), wherein furthermore an auxiliary volume (5) is integrated into the piping system (4) such that a gas-accessible volume of the piping system (4) depends on a fill level (h) of a liquid (6) in the auxiliary volume (5).and wherein the fill level (h) of the liquid (6) in the auxiliary volume (5) is increased at least in one case of a reduction in the volumetric flow rate of the feed gas stream.