Catalyst Membrane Gas Detector for H2S and NOx
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Solution Overview
Problem
Existing gas detection methods in oil and gas installations face challenges in reliably detecting noxious gases like H2S and NOx, as their spectra overlap with harmless gases, and current sensors lack self-diagnostic capabilities and often require complex systems with active components and pumps.
Innovation Solution
A simple optical gas detector using a catalyst membrane that allows gases to diffuse through, converting H2S to SO2 or NOx to N2O, eliminating the need for active components and enabling self-functional verification, with a catalyst made from FeCrAl alloy and operated without forced pressure differences.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If optical sensors are used to detect noxious gases like H2S and NOx, then gas detection capability is provided, but spectrum overlap with harmless gases causes unreliable detection
Solution Approach 1:
A catalyst membrane is introduced as an intermediary component between the gas sample and the optical detector. The membrane selectively converts noxious gases (H2S, NOx) into different gases with distinct spectral signatures that do not overlap with common interfering gases, enabling reliable optical detection
Solution Approach 2:
The chemical composition parameter of the target gas is changed by passing it through a catalyst membrane that transforms H2S to SO2 and NOx to N2O. These transformed gases have unique absorption spectra that can be reliably distinguished from interfering gases using optical detection
2Reliability
If complex systems with pumps and active components are used, then fail-safe detection is provided, but power consumption increases and device complexity increases
Solution Approach 1:
The catalyst membrane operates passively using only the kinetic energy of diffusing gas molecules to drive the catalytic conversion. No external power, pumps, or active components are required, yet the system provides reliable detection by automatically converting noxious gases to detectable forms
Solution Approach 2:
The mechanical pumping system is replaced with a passive diffusion-based transport mechanism. Gas moves through the catalyst membrane solely by diffusion driven by concentration gradients, eliminating the need for mechanical pumps and reducing system complexity
3Reliability
If conventional sensors are used for H2S detection, then detection capability is provided, but functional failure cannot be verified
Solution Approach 1:
The system incorporates a self-diagnostic feedback mechanism where the optical detector continuously monitors for the presence of converted gases (SO2, N2O). The absence of expected spectral signals provides feedback that the catalyst membrane or optical path may be malfunctioning, alerting users to functional failures
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 solution provides reliable, self-verifying gas detection without complex systems, ensuring accurate identification of noxious gases and functional status, while minimizing power consumption and avoiding false alarms through efficient gas conversion and calibration methods.
Implementation Method 1
a catalyst is positioned in said membrane openings for converting the gas diffusing therethrough to said predetermined gas
Implementation Method 2
The thickness of the membrane is not important, thus the term in this case may include a wide range, but the openings are chosen so as to allow diffusion of the target gas
Data Source
AI summary
The present invention relates to a gas detector cell and cell unit for optical detection of a predetermined gas, the cell being provided with optical means for investigating a gas sample present in the cell. The cell is constituted by a volume enclosed in a container, at least part of the container wall being constituted by a membrane, the membrane being provided with openings allowing diffusion of gas therethrough, and the membrane openings being provided with a catalyst for converting the gas diffusing therethrough to said predetermined gas.