Turbulence Generator Reactor for Partial Oxidation
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Solution Overview
Problem
High temperature partial oxidation of hydrocarbons in reactors faces challenges with premature ignition and flashback due to limited thermal stability of reactant mixtures, leading to operation shutdowns and reduced economic viability, especially when using reactive feedstocks like hydrogen or light petroleum.
Innovation Solution
The process involves feeding hydrocarbon and oxygen streams separately through reactor channels equipped with turbulence generators, creating a highly turbulent flow field that mixes the reactants in a narrow space before conversion, stabilizing the flame with pilot oxygen injection and positioning stabilizing flames at a distance from the burner block to prevent recirculation and coke deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If reactants are mixed intensively in a mixing zone with long residence time, then mixing quality is improved, but premature ignition and flashback risk increases
Solution Approach 1:
The reactor is divided into distinct functional zones: a mixing zone with turbulence generators for rapid mixing, a reaction zone for controlled oxidation, and a quench zone for rapid cooling. This segmentation allows each zone to perform its specific function optimally without interfering with others, resolving the contradiction between mixing quality and ignition stability.
Solution Approach 2:
Reactants are preheated separately in heat exchangers before entering the mixing zone, and the mixing zone is designed with specific turbulence generators that create rapid mixing without requiring long residence times. This preliminary preparation allows the reaction to proceed efficiently in the designated reaction zone while preventing premature ignition in the mixing zone.
2Reliability
If flame stabilization is achieved through accumulation body stabilization with recirculated hot gas, then flame stability is improved, but coke deposition and catalyst deactivation increase
Solution Approach 1:
The harmful recirculation of hot gas that causes coke deposition is eliminated by designing a system where the mixing zone is spatially separated from the reaction zone. Fresh reactants are continuously supplied to the mixing zone, preventing the accumulation of coke-forming conditions while maintaining flame stability through controlled reaction zone conditions.
Solution Approach 2:
A catalyst bed is introduced as an intermediary between the mixing zone and reaction zone, providing a controlled surface for reaction initiation that stabilizes the flame without requiring hot gas recirculation. The catalyst facilitates the oxidation reaction at lower temperatures, reducing coke formation while maintaining stability.
3Productivity
If highly reactive feedstocks like hydrogen or light petroleum are used, then productivity and yield are improved, but induction time decreases leading to higher flashback risk
Solution Approach 1:
The problem of short induction time is solved by transitioning from a single-zone reactor design to a multi-dimensional zoned system. The mixing zone provides rapid turbulent mixing in a short distance, the reaction zone provides controlled oxidation conditions, and the quench zone provides rapid cooling. This dimensional separation allows highly reactive feedstocks to be processed safely while maintaining high productivity.
Solution Approach 2:
The reactor design changes key parameters including temperature distribution (preheating reactants separately, controlled reaction temperature, rapid quenching), pressure conditions, and flow velocities in different zones. These parameter changes allow highly reactive feedstocks to be processed with short residence times while preventing flashback through the zoned architecture and quenching system.
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 prevents premature ignition, allows for efficient mixing of reactive feedstocks, and maintains process stability, reducing shutdowns and coke deposition, thereby enhancing the economic viability and yield of acetylene and synthesis gas production.
Implementation Method 1
both streams fed to the reactor are conducted within the reactor separately through in each case one or more spatially separate lines, these lines having turbulence generators in their interior, owing to which, as a result of the imposed deflection of the flow direction downstream of said turbulence generators, a highly turbulent flow field forms
Implementation Method 2
quench nozzles are installed outside its circumference on one or more quench distributor rings which atomize the quench medium, for example water or oil, with or without the aid of an atomization medium and spray it in approximately at right angles to the main flow direction of the reaction gases leaving the firing chamber. This direct quench has the task of cooling the stream extremely rapidly as it reacts, such that subsequent reactions, i.e. more particularly the degradation of acetylene formed, are frozen
Implementation Method 3
The metallic burner block is cooled in order to withstand the thermal stresses
Implementation Method 4
The mixing zone is followed immediately by the reaction zone which is stabilized by injection of pilot oxygen into the highly turbulent flow zone
Data Source
AI summary
A process for partial oxidation of hydrocarbons in a reactor, in which a stream comprising the hydrocarbon and a stream comprising the oxygen are fed to the reactor, wherein both streams fed to the reactor are conducted within the reactor separately through in each case one or more spatially separate lines, these lines having turbulence generators in their interior, owing to which, as a result of the imposed deflection of the flow direction downstream of turbulence generators, a highly turbulent flow field forms, and the streams are then mixed in a mixing zone after exiting from the lines and then converted in a reaction zone.