Polymer Sampler for Polyhalogenated Compound Gas Monitoring
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for determining polyhalogenated compound concentrations in gases, such as PCDD/Fs, are costly, labor-intensive, and do not allow for real-time monitoring, especially during plant start-up phases or operational disturbances, leading to potential emission peaks being missed and inaccurate measurements due to low detection levels.
Innovation Solution
A method using a sampler material with a polymer matrix and filler, such as carbon, that absorbs and adsorbs polyhalogenated compounds, allowing for in-situ sampling without moving parts, enabling continuous monitoring and calculation of Time Weighted Average concentrations using GC-MS analysis, which can be correlated to gas concentrations, thereby reducing costs and improving accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional sampling methods (filter/condenser, dilution, cooled probe) are used to determine PCDD/F concentrations, then measurement capability is achieved, but substantial cost and effort are required
Solution Approach 1:
The invention extracts only the essential sampling function from complex conventional systems. Instead of using elaborate filter/condenser systems, dilution apparatus, or cooled probes, the patent employs a simple heated probe that extracts gas phase PCDD/Fs through thermal desorption, eliminating the need for complex filtration and condensation equipment while maintaining measurement capability
Solution Approach 2:
The invention replaces mechanical sampling systems (pumps, filters, condensers, cooled probes) with a thermal field-based approach. A heated probe uses temperature differential to drive PCDD/F desorption and transport, substituting mechanical movement and phase change systems with a purely thermal mechanism that is simpler and more reliable
2Productivity
If short-term sampling (6-8 hours twice annually) is performed according to Industrial Emissions Directive, then regulatory compliance is achieved, but emission peaks during start-up phases are missed
Solution Approach 1:
The invention enables dynamic sampling that adapts to operational conditions. The simplified probe system can be deployed continuously or for extended periods without the maintenance burden of complex equipment, allowing sampling during start-up, shutdown, and steady-state operations to capture transient emission peaks that fixed short-term schedules would miss
Solution Approach 2:
The probe is positioned and prepared in advance during plant start-up phases before emissions occur. The system is ready to immediately capture PCDD/Fs as they are formed during critical start-up periods, rather than waiting for scheduled sampling events that occur too late to capture transient emissions
3Measurement precision
If very low levels of PCDD/Fs are detected using conventional methods, then detection capability is achieved, but measurement uncertainties and errors increase
Solution Approach 1:
The invention changes the temperature parameter to optimize detection. By heating the probe to temperatures above the dew point but below PCDD/F decomposition temperatures, the system maintains PCDD/Fs in the gas phase for reliable detection while avoiding condensation losses that plague conventional cooled probe methods, thereby improving both precision and reliability at low concentrations
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 method provides a reliable, cost-effective, and accurate means to continuously monitor polyhalogenated compound concentrations in gases, allowing for real-time emission control and extended sampling periods without the need for expensive equipment, with a high selectivity and absorption rate, and simultaneously cleans the gas by removing these compounds.
Implementation Method 1
a polymer matrix that is suitable for absorbing one or more polyhalogenated compounds
Implementation Method 2
a filler that is suitable for adsorbing one or more polyhalogenated compounds
Data Source
AI summary
Method for determining a concentration of one or more polyhalogenated compounds in a gas. The method comprises the steps of exposing at least one sampler (10) containing or constituted by a material (14) comprising a polymer matrix that is suitable for absorbing one or more polyhalogenated compounds, and a filler that is suitable for absorbing and adsorbing one or more polyhalogenated compounds which is distributed through said polymer matrix, to gas (12) containing one or more polyhalogenated compounds during a sampling period, whereby said gas (12) constitutes at least part of said gas whose concentration of one or more polyhalogenated compounds is to be determined, determining an amount of one or more polyhalogenated compounds adsorbed or absorbed by said material, (14), and calculating a concentration of one or more polyhalogenated compounds in said gas (12) to which said material (14) was exposed, either upstream or downstream of said at least one sampler (10).