SO3 and H2SO4 Gas Concentration Photometer
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Solution Overview
Problem
Current methods for measuring SO3 and H2SO4 concentrations in gases are not continuous, leading to inefficiencies in additive control and increased emissions, with existing technologies relying on manual or non-continuous measurements.
Innovation Solution
A photometer device with a light source, cuvette, optical filter unit, and evaluation device that uses specific wavelengths for SO3 and H2SO4 absorption, accounting for cross-sensitivities to continuously measure concentrations, calibrated with gases of known concentration, and equipped with an adjustment filter for drift correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual or non-continuous measurement methods are used for SO3 and H2SO4 concentrations, then device complexity is reduced, but measurement precision and productivity deteriorate due to inability to continuously monitor and control emissions
Solution Approach 1:
The patent applies parameter changes by selecting specific measurement wavelengths (7050-7250 nm for SO3, 10800-12200 nm for H2SO4) where absorption by target gases is maximized while interference from other components is minimized. This wavelength selection parameter change enables continuous measurement with improved precision while maintaining manageable device complexity through optimized optical filtering.
Solution Approach 2:
The patent uses an optical filter unit as an intermediary component that selectively transmits measurement wavelengths absorbed by SO3 and H2SO4 while blocking other wavelengths. This intermediary filter enables the photometer to continuously measure target gas concentrations with high precision by isolating their specific absorption signals from the complex combustion gas mixture.
2Object-generated harmful factors
If additives are injected without continuous SO3 measurement, then device complexity is reduced, but harmful factors increase due to uncontrolled SO3 emissions and excessive additive usage
Solution Approach 1:
The patent implements feedback control by continuously measuring SO3 and H2SO4 concentrations with the photometer system and using this real-time data to control additive injection rates. The measurement results feed back to the control system, enabling dynamic adjustment of additive dosing to maintain optimal SO3 levels and minimize harmful emissions while reducing excessive additive usage.
Solution Approach 2:
The patent achieves continuous monitoring of SO3 and H2SO4 concentrations through the photometer system, enabling uninterrupted measurement and control of emissions. This continuous action allows real-time detection of concentration changes and immediate corrective adjustments, preventing harmful emissions rather than relying on periodic or manual checks.
3Measurement precision
If cross-sensitivities are not accounted for in measurement, then device complexity is reduced, but measurement precision deteriorates due to interference from other gas components
Solution Approach 1:
The patent applies preliminary action by pre-determining cross-sensitivity factors for various gas components at the selected measurement wavelengths before actual measurement. These cross-sensitivity corrections are stored and applied automatically during continuous operation, enabling accurate SO3 and H2SO4 concentration measurements while compensating for interference from other combustion gases without adding significant operational complexity.
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
Enables continuous, accurate measurement of SO3 and H2SO4 concentrations, reducing costs and emissions by allowing real-time monitoring and corrective actions, while minimizing additive usage and addressing corrosion and air quality issues.
Implementation Method 1
an optical filter which is selected in such a way that it transmits a measurement wavelength which is selected in such a way that it is absorbed as well as possible by SO 3 and/or H 2 SO 4
Implementation Method 2
A gas analyzer with which the concentration of SO 3 and H 2 SO 4 can be determined is known from US Pat. No. 6,396,056 B1. This device works according to the in-situ principle.
Data Source
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AI summary
The invention relates to a device for continuously measuring SO3 and/or H2SO4 concentrations in gases, comprising a photometer with a light source, a cuvette, a receiver, and an optical filter unit with at least one optical filter selected to transmit a measurement wavelength chosen to be absorbed as well as possible by SO3 and/or H2SO4 and as little as possible by the other components of the gas, and the photometer being calibrated with SO3 and H2SO4 gases of known concentration, and an evaluation unit comprising a storage unit in which previously measured cross-sensitivities at the measurement wavelength are stored, and the evaluation unit being able to continuously determine a concentration value for SO3 and/or H2SO4 from the photosignals and the stored cross-sensitivities.