Exhaust Gas Regulation System with Dynamic Fan Control
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Solution Overview
Problem
The continuous operation of suction fans in exhaust systems at maximum speed results in high energy consumption and costs, particularly in steelworks where pressure ratios of primary gas vary during different operating states of converters.
Innovation Solution
A control device regulates the speed of the suction fan by varying the degree of opening of the valve in the exhaust gas duct, allowing the fan to operate at reduced speeds and optimizing energy use by maintaining a target degree of opening or pressure drop, depending on operational conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the suction fan is operated at maximum speed continuously, then sufficient suction power is maintained for all operating states and pressure conditions, but energy consumption and operating costs become very high
Solution Approach 1:
The suction fan speed is made dynamically adjustable rather than fixed at maximum. The control device varies the fan speed according to actual operating conditions, allowing the system to adapt to different pressure ratios and gas flow rates, thereby reducing energy consumption while maintaining sufficient suction power when needed.
Solution Approach 2:
The operating parameters of the suction fan (speed, power) are changed based on measured pressure ratios and gas flow conditions. The control device adjusts these parameters to match actual system requirements, avoiding the waste of operating at maximum speed when lower power levels are sufficient.
2Use of energy by moving object
If the suction fan speed is reduced to save energy, then energy consumption decreases, but maintaining sufficient suction power across all operating states becomes difficult
Solution Approach 1:
The control device implements a feedback mechanism that continuously measures the pressure ratio in the exhaust gas duct and uses this information to adjust the suction fan speed. This closed-loop control ensures that the fan speed is always appropriate for the current operating conditions, maintaining adaptability while reducing energy consumption.
Solution Approach 2:
The system uses its own operational parameters (pressure ratio, gas flow rate) to automatically regulate the suction fan speed. The control device processes measurements from the exhaust system itself to determine the optimal fan speed, making the system self-regulating and adaptive without external intervention.
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 approach significantly reduces the need for electrical energy and operating costs by adjusting the suction fan speed according to the required conditions, ensuring efficient operation across varying pressure ratios.
Implementation Method 1
a suction fan arranged downstream of the valve in the exhaust gas duct for conveying the exhaust gas inside the exhaust duct towards the outlet
Implementation Method 2
A valve with the function of a Venturi throat is installed in the exhaust gas scrubber; there the water is dusted into the stream of primary gas
Data Source
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AI summary
The invention relates to an exhaust gas system comprising an exhaust gas channel for receiving exhaust gas from an exhaust gas generator at the exhaust gas channel inlet and for discharging the exhaust gas at the exhaust gas channel outlet, comprising a valve in the exhaust gas channel, comprising a suction fan arranged in the exhaust gas channel downstream of the valve for conducting the exhaust gas within the exhaust gas channel in the direction of the outlet, and comprising a regulating device. The aim of the invention is to save on energy and costs. This is achieved by an alternative regulating process for the exhaust gas system, wherein the degree of opening of the valve is adjusted to a specified target degree of opening by varying the rotational speed of the suction fan in a suitable manner.