Steam Condensation Tower with Selective Stack Evacuation
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Solution Overview
Problem
Existing granulation installations for molten blast furnace slag face challenges in reliably evacuating excessive steam during peak flow rates, leading to overpressure and potential steam backflow, which poses safety risks and reduces installation efficiency.
Innovation Solution
A steam condensation tower equipped with a selectively controllable chimney or stack that allows for the evacuation of excessive steam to the atmosphere, using a combination of a water curtain obturator device and condensation nozzles, and/or a forced draught blower to manage steam flow, ensuring safe and efficient operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the steam condensation capacity is designed to handle the full steam flow during peak slag flows, then steam evacuation reliability is improved, but installation size and costs increase
Solution Approach 1:
The steam evacuation function is segmented into two separate systems: a condensation system for normal operation and a stack with obturator device for peak flow evacuation. This segmentation allows each system to be optimized for its specific function, avoiding the need to oversize the entire system for peak conditions.
Solution Approach 2:
The obturator device dynamically controls the stack opening based on steam flow conditions. During peak slag flows, the obturator opens to allow steam evacuation through the stack; during normal operation, it closes to direct steam through the condensation system. This dynamic control enables reliable steam evacuation without requiring the condensation system to be continuously oversized.
2Productivity
If overpressure relief flaps are used to evacuate excessive steam, then steam evacuation capability is improved, but steam backflow and safety risks occur
Solution Approach 1:
The obturator device acts as an intelligent intermediary between the steam flow and the stack opening. It senses steam flow conditions and selectively opens or closes the stack, mediating between the need for steam evacuation and the risk of backflow. This controlled mediation prevents the uncontrolled backflow issues associated with simple relief flaps.
Solution Approach 2:
The passive mechanical relief flap system is replaced with a more sophisticated control mechanism (obturator device) that can actively respond to steam flow conditions. This substitution transforms the system from passive pressure-driven opening to active controlled opening, preventing backflow while maintaining evacuation capability.
3Device complexity
If the condensation system is downsized to reduce costs, then installation costs are reduced, but steam condensation capacity becomes insufficient during peak flows
Solution Approach 1:
The condensation system is designed to handle only the partial steam flow expected during normal operation, rather than the full steam flow during peak conditions. The obturator-controlled stack provides the additional evacuation capacity needed during peak flows, allowing the condensation system to be downsized without compromising overall steam management capability.
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 enables reliable evacuation of excess steam, reducing safety risks, allowing for a smaller-scale condensation system design, and lowering capital and operating costs by safely handling higher slag flow rates without increasing water flow rates or infrastructure costs.
Implementation Method 1
a steam condensing system, typically of the counter-current type, having a water-spraying device [5] for spraying water droplets into steam that rises inside the steam condensation tower
Implementation Method 2
a water-spraying device [5] for spraying water droplets into steam that rises inside the steam condensation tower
Implementation Method 3
A steam condensation tower equipped with a selectively controllable chimney or stack that allows for the evacuation of excessive steam to the atmosphere
Implementation Method 4
enables reliable evacuation of excess steam, reducing safety risks
Data Source
AI summary
A granulation installation for a melt produced in a metallurgical plant having a water injection device for quenching and granulating the melt and a granulation tank for collecting water and granulates. The installation includes a steam condensation tower located above the granulation tank for collecting steam generated therein, where the tower has a steam condensing system. The system includes a water-spraying device disposed above a water-collecting device. The tower further includes a stack extending into the tower and configured for selectively evacuating excessive steam to the atmosphere. The stack has an inlet communicating with the lower zone of the tower and an outlet arranged to evacuate steam to the atmosphere above the tower. The stack is equipped with an obturator device for selective evacuation of steam through the stack. The installation may process an increase of 60% of slag without any risk of steam backflow in the granulation area.