Two-Stage Sulfur Combustion for High-Conversion Sulfurous Acid
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Solution Overview
Problem
Existing systems for producing sulfurous acid have low conversion efficiency from sulfur to sulfurous acid, typically achieving only 60% or less, and produce compositions with a pH of 2.5 or higher, which may not be suitable for certain applications.
Innovation Solution
A system with a primary burn chamber, exhaust pipe, secondary burn chamber, and venturi pumps is used to enhance sulfur dioxide production by incorporating a secondary burn chamber in the exhaust pipe, where a temperature gradient and controlled flow rates facilitate complete sulfur oxidation, followed by mixing with water to achieve high conversion efficiency and lower pH levels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single burn chamber system is used, then the device complexity is low, but the sulfur to sulfurous acid conversion efficiency is only 60% or less
Solution Approach 1:
The burn chamber is divided into two distinct chambers: a primary burn chamber for initial sulfur combustion and a secondary burn chamber for completing the oxidation of sulfur to sulfur dioxide. This segmentation allows each chamber to perform a specific function, improving overall conversion efficiency from 60% to greater than 90% by ensuring complete oxidation of sulfur.
Solution Approach 2:
The secondary burn chamber is positioned within the exhaust path of the primary burn chamber, creating a nested configuration where the exhaust from the primary chamber flows through the secondary chamber. This nesting allows the system to achieve high conversion efficiency while maintaining a compact structure, effectively resolving the contradiction between improved productivity and device complexity.
2Manufacturing precision
If conventional sulfurous acid production systems are used, then the pH is 2.5 or higher, but this pH level is not sufficient for some applications
Solution Approach 1:
The system changes the operational parameters of the burn chambers, specifically maintaining the secondary burn chamber temperature between 232-850°C and controlling the exhaust flow rate between 20-400 gallons per minute. These parameter changes enable precise control over the sulfurous acid production process, achieving a pH less than 2.5 that is suitable for various applications.
3Productivity
If the secondary burn chamber is added to the exhaust pipe, then the sulfur oxidation is complete and conversion efficiency exceeds 90%, but the device complexity increases
Solution Approach 1:
The secondary burn chamber is merged with the exhaust pipe structure, where the exhaust from the primary burn chamber flows directly through the secondary burn chamber. This merging allows the system to achieve complete sulfur oxidation and greater than 90% conversion efficiency while avoiding the need for separate, complex equipment, thus minimizing the increase in device complexity.
4Temperature
If the exhaust flow rate is controlled at 20-400 gallons per minute, then the temperature gradient is optimized for complete oxidation, but the control complexity increases
Solution Approach 1:
The system is designed to maintain the exhaust flow rate within the optimal range of 20-400 gallons per minute through self-regulating mechanisms, where the temperature gradient in the secondary burn chamber naturally optimizes for complete oxidation. This self-service approach allows the system to maintain optimal temperature control without requiring complex external control systems, preserving ease of operation.
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 system achieves greater than 90% conversion of sulfur to sulfurous acid and produces it at a pH less than 2.5, improving efficiency and acidity for various applications.
Implementation Method 1
burning a first portion of the sulfur in the primary burn chamber to form a first portion of sulfur dioxide
Implementation Method 2
burning a second portion of the sulfur in the secondary burn chamber to form a second portion of sulfur dioxide
Implementation Method 3
mixing the first and second portions of sulfur dioxide with an aqueous composition so as to produce aqueous sulfurous acid
Data Source
AI summary
A sulfuric acid generating system can include: a primary burn chamber; an exhaust pipe extending from the burn chamber at a first end to an opposite second end; a secondary burn chamber located between the first end and second end; and a primary venturi pump having a gas inlet coupled to an outlet at the second end of the exhaust pipe and having an aqueous media inlet and having a fluid outlet. A method of producing sulfurous acid can include: providing sulfur to the primary burn chamber; burning a first portion of the sulfur in the primary burn chamber to form a first portion of sulfur dioxide; burning a second portion of the sulfur in the secondary burn chamber to form a second portion of sulfur dioxide; and mixing the first portion and second portion of sulfur dioxide with an aqueous composition so as to produce aqueous sulfurous acid.