Isothermal Shift Reactor for High CO Conversion
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Solution Overview
Problem
Conventional adiabatic shift technologies face challenges in achieving high CO conversion efficiency with high CO content gases, leading to catalyst degradation, increased energy consumption, and complex multi-reactor systems, especially when dealing with industrial off-gas and coal gas with high CO concentrations.
Innovation Solution
An isothermal shift reactor design featuring a pressure vessel with concentric and U-shaped water-steam tubes, catalyst beds, and a steam-water mixture injection system, which maintains a consistent reaction temperature and reduces system pressure drop, allowing for high CO conversion efficiency with a single reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If adiabatic shift technology is used to process high CO content gases, then CO conversion can be achieved, but catalyst degradation occurs and energy consumption increases
Solution Approach 1:
The patent changes the thermal regime parameter from adiabatic to isothermal operation. By maintaining constant temperature through controlled steam injection and heat exchange, the catalyst operates within optimal temperature ranges, preventing thermal degradation and extending catalyst lifetime while achieving high CO conversion rates.
Solution Approach 2:
The patent employs periodic steam injection into the catalyst bed to maintain isothermal conditions. This periodic addition of steam absorbs reaction heat and prevents temperature runaway, protecting the catalyst from thermal damage while sustaining high conversion efficiency throughout operation.
2Productivity
If adiabatic shift technology is used for high CO content gases, then CO conversion is achieved, but energy consumption increases
Solution Approach 1:
The patent makes the reaction system self-regulating by using the reaction heat itself to generate steam that is then injected back into the catalyst bed. This internal heat recycling eliminates the need for external cooling systems and reduces energy consumption while maintaining high CO conversion rates.
Solution Approach 2:
The patent utilizes the phase transition of water to steam as a heat management mechanism. By injecting water that vaporizes in situ, the system absorbs excess reaction heat efficiently, converting thermal energy into useful steam rather than dissipating it, thereby reducing overall energy consumption.
3Productivity
If conventional shift technology is used, then CO conversion is achieved, but system complexity increases with multi-reactor systems
Solution Approach 1:
The patent combines multiple functions into a single reactor vessel: CO conversion, temperature control, and steam generation all occur within one integrated system. The steam injection system and catalyst bed are combined in a way that eliminates the need for separate reactors and heat exchange systems, simplifying the overall process while maintaining high conversion efficiency.
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 isothermal shift reactor achieves CO conversion rates of 98% or higher with reduced catalyst degradation, lower energy consumption, and simplified process design, extending catalyst lifetime and reducing system complexity.
Implementation Method 1
a water chamber defined by the upper seal head and the upper tube sheet, a steam chamber defined by the upper tube sheet and a lower tube sheet... the water chamber is connected by connection tubes to the steam chamber
Implementation Method 2
maintains a consistent reaction temperature... isothermal shift reactor achieves CO conversion rates of 98% or higher with reduced catalyst degradation, lower energy consumption
Implementation Method 3
an upper catalyst bed located at an upper mid portion of the outside pressure vessel chamber... a lower catalyst bed located at a lower mid portion of the outside pressure vessel chamber... reacting the feed gas in the isothermal shift reactor, wherein a temperature range in an upper catalyst bed and lower catalyst bed is within approximately 260° C. to approximately 275° C. and the CO concentration by volume of the shifted gas is approximately 0.4% to approximately 0.7%
Data Source
AI summary
An isothermal carbon monoxide (CO) shift reactor having high CO conversion and the process technology comprises the outside pressure vessel; the catalyst unit; upper and lower tube sheets welded with water tubes and bottom tee joints; the said outside pressure vessel has seal heads at the upper and lower ends; the said vessel has a water chamber and a steam chamber at the upper section. The catalyst unit comprises the upper catalyst bed with water tubes. There is a central pipe that is located in the said vessel, of which the upper end is located in the upper catalyst bed while the lower end is located in the lower catalyst bed; the said bottom tee joint has an inlet for feed gas, outlet for reacted shift gas and inlet for steam-water mixture; the said central pipe is installed with spray nozzle for steam-water mixture; the said reactor is applicable for process technologies for feed and effluent gas having different CO contents. Low temperature, high CO feed content, high shift conversion and low system pressure drop are direct results of this disclosure.