Flare Smoke Suppression via Dual Sensor Feedback
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Solution Overview
Problem
Refineries and chemical plants face environmental pollution issues due to unburned waste gas emissions from flares, as existing methods fail to accurately correlate combustion efficiency with smoke production, leading to inefficient smoke suppression and potential reduction in combustion efficiency when introducing steam.
Innovation Solution
A system with a particulate matter sensor to detect smoke independently of combustion efficiency and a combustion efficiency sensor to measure unburned volatile organic compounds, a controller adjusts the steam injection rate based on these signals to limit smoke and emissions, optimizing flare operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If steam injection rate is increased to suppress smoke, then smoke emissions are reduced, but combustion efficiency deteriorates
Solution Approach 1:
The system employs a particulate matter sensor to detect smoke emissions and provides feedback to the controller, which adjusts the steam injection rate accordingly. This closed-loop feedback mechanism enables dynamic optimization of smoke suppression while maintaining combustion efficiency by responding to actual emissions rather than using fixed or indirect control parameters.
Solution Approach 2:
The invention replaces indirect combustion efficiency measurements (infrared radiation) with direct particulate matter detection using a particulate matter sensor. This substitution provides accurate real-time smoke emission data independent of combustion efficiency, enabling precise control of steam injection to suppress smoke without compromising combustion performance.
2Ease of operation
If combustion efficiency is used to determine smoke suppression needs, then control is simplified, but measurement accuracy deteriorates due to lack of correlation between combustion efficiency and smoke production
Solution Approach 1:
The system substitutes indirect combustion efficiency measurements with direct particulate matter detection. The particulate matter sensor directly measures smoke emissions rather than inferring them from combustion efficiency, providing accurate smoke detection independent of the combustion process parameters. This maintains control simplicity while dramatically improving measurement precision for smoke suppression decisions.
Solution Approach 2:
The particulate matter sensor acts as an intermediary that directly detects smoke emissions without relying on combustion efficiency as an intermediate parameter. This direct measurement pathway eliminates the correlation problem between combustion efficiency and smoke production, providing accurate smoke detection while keeping the control system straightforward through automated sensor-controller integration.
Data Source
AI summary
Methods and apparatus relate to control of smoke suppressant flow rate to a flare that disposes of combustible gas, such as waste from refineries and chemical plants. One or more detectors produce signals that enable separate monitoring of both particulate emissions from the flare and combustion efficiency of the flare. Adjusting the flow rate of the smoke suppressant to the flare in response to such dual monitoring facilitates operation of the flare so as to manage environmental pollution caused by unburned volatile organic compounds and smoke emitted from the flare.