Synthesis Gas Purification via Adsorption and Cooling
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Solution Overview
Problem
Current methods for purifying synthesis gas from biomass gasification are inefficient due to the use of solvents that require complex regeneration, leading to high energy consumption and environmental impact, and do not effectively minimize impurities that can deactivate catalysts and clog equipment.
Innovation Solution
A process involving cooling to condense heavy organic impurities and water, followed by adsorption using multiple adsorption beds with temperature-modulated desorption, eliminating the need for solvent washing and regeneration, and optimizing energy use by reusing cooled water and efficiently regenerating adsorption beds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If solvent washing is used to remove impurities from synthesis gas, then purification effectiveness is improved, but energy consumption increases due to complex solvent regeneration
Solution Approach 1:
The patent extracts and removes the solvent washing and regeneration steps from the purification process, replacing them with direct adsorption using solid adsorbent materials. This eliminates the energy-intensive solvent regeneration operation while maintaining effective impurity removal through adsorption mechanisms.
Solution Approach 2:
The patent changes the physical-chemical parameters of the purification approach by transitioning from liquid solvent washing to solid adsorbent materials operating at different temperature conditions. The adsorption process utilizes temperature modulation to control impurity uptake and release, eliminating the need for solvent regeneration energy input.
2Reliability
If multiple purification stages are implemented to remove all impurities, then catalyst protection is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple purification functions into a single adsorption bed system that simultaneously removes various types of impurities (tar, hydrogen sulfide, carbon oxysulfide, ammonia, hydrochloric acid) through the adsorbent material. This consolidation simplifies the device structure while maintaining comprehensive catalyst protection.
Solution Approach 2:
The adsorbent material performs multiple purification functions simultaneously, acting as a universal filter for diverse impurities including organic and inorganic compounds. This multi-functionality reduces the number of separate purification units needed while ensuring thorough catalyst protection.
3Productivity
If continuous operation is maintained without regeneration downtime, then productivity is improved, but impurity accumulation in adsorption beds occurs
Solution Approach 1:
The patent implements periodic regeneration cycles of the adsorption beds, where beds are sequentially switched between service and regeneration modes. This periodic action allows continuous overall operation while systematically removing accumulated impurities from the adsorbent material through temperature-modulated desorption.
Solution Approach 2:
The patent ensures continuous purification capability by maintaining multiple adsorption beds in parallel, allowing one bed to serve while another regenerates. This continuity of useful action eliminates downtime and maintains constant impurity removal from the synthesis gas stream.
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 process reduces energy consumption, minimizes environmental impact, and ensures continuous operation by simplifying the treatment routine, while effectively removing impurities and optimizing the conversion of carbon into synthetic gas, thus enhancing the overall efficiency of the synthesis gas production.
Implementation Method 1
a stage of cooling the synthesis gas to condense heavy organic impurities and water
Implementation Method 2
a stage of adsorption, at the outlet of the cooling stage, of light organic impurities and of inorganic impurities by at least one bed adsorption
Implementation Method 3
a stage of regeneration of at least one adsorption bed by desorption modulated in temperature comprising a stage injection of a hot gas against each said adsorption bed, the hot gas being superheated steam or a pure gas or a mixture of gases
Implementation Method 4
the hot gas being superheated steam or a pure gas or a mixture of gases chosen from C=2, CH4, H2, CO, at a temperature comprised between 110°C and 250°C
Data Source
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AI summary
The invention relates to a method (10) for treating a synthesis gas from a gasification step, which includes: a step (105) of cooling the synthesis gas in order to condense heavy organic impurities and water; a step (110) of adsorption, at the end of the cooling step, of light organic impurities and inorganic impurities by at least one adsorption bed (230); a step (155) of separation, by decantation (135), of the water and heavy tars from the step (105) of cooling the synthesis gas; and a step (120) of regenerating at least one adsorption bed (230) by temperature-modulated or pressure-modulated desorption.