Telescopic Blanking Pipe for Coal Silo Ventilation
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Solution Overview
Problem
The existing coal storage Eurosilo technology faces challenges with high vapor concentration leading to acidic corrosion and flammable gas accumulation, which poses safety risks and inefficiencies in ventilation, particularly with lignite coal prone to spontaneous combustion, resulting in inadequate gas exchange and potential asphyxiation hazards.
Innovation Solution
A ventilating and blanking device featuring a central telescopic blanking pipe with an axial flow fan and baffle door mechanism, which rapidly replaces air near the coal pile by extending the pipe close to the coal surface, utilizing a spiral frame and rotary trestle for efficient gas discharge and air supply, ensuring effective ventilation and safety.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nitrogen is released from the bottom of the silo body to fill gaps between coal particles, then oxidation reaction is suppressed, but oxygen content in the space without coal is reduced causing asphyxiation risk
Solution Approach 1:
The silo is divided into two functional zones: the coal storage area at the bottom where nitrogen is released for oxidation prevention, and the upper space without coal where air is supplied through the central telescopic blanking pipe to maintain oxygen content for personnel safety. This spatial segmentation allows simultaneous achievement of both safety objectives.
2Ease of operation
If top fan is used to discharge gas from the silo, then gas discharge function is provided, but ventilation efficiency is low and air replacement takes at least 10 hours
Solution Approach 1:
The ventilation system transitions from a single top-down discharge approach to a three-dimensional airflow pattern by introducing the central telescopic blanking pipe that extends to the coal pile surface, creating multiple airflow paths (radial and axial) for rapid gas replacement.
Solution Approach 2:
The central telescopic blanking pipe is pre-positioned to extend close to the coal pile surface before ventilation operation begins, ensuring that air supply starts at the optimal location for maximum ventilation efficiency from the outset.
3Productivity
If top fan exhaust volume is greater than air entering the silo, then gas discharge is enhanced, but negative pressure is formed causing load on silo top and safety hazards
Solution Approach 1:
The baffle door mechanism provides automatic feedback control by adjusting the air supply volume based on the ventilation state, preventing excessive negative pressure formation while maintaining effective gas discharge through the central telescopic blanking pipe.
4Ease of manufacture
If conventional blanking pipe is used for coal feeding, then coal conveying function is provided, but ventilation function is insufficient and gas replacement is slow
Solution Approach 1:
The central telescopic blanking pipe is designed to perform dual functions: coal feeding during loading operations and active ventilation during storage. The pipe can be extended to the coal pile surface and equipped with the axial flow fan to provide rapid gas replacement while maintaining its original coal conveying 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 significantly shortens air replacement time, reduces acidic corrosion, enhances ventilation efficiency, ensures coal storage safety, and maintains personnel safety by rapidly displacing flammable gases and water vapor, while being cost-effective and adaptable to different coal types.
Implementation Method 1
an axial flow fan arranged at an inlet end of the air supply pipe
Implementation Method 2
a baffle door movably arranged in the second pipeline and connected to a driving mechanism
Data Source
AI summary
The present invention relates to a ventilating and blanking device for a coal storage Eurosilo. The ventilating and blanking device includes a top blanking pipe, an axial flow fan and a baffle door, the top blanking pipe including a first pipeline and a second pipeline, an air supply pipe is connected to a side wall of the second pipeline, and the baffle door is connected to a driving mechanism; during blanking, the driving mechanism drives the baffle door so as to make the baffle door close the air supply pipe and the axial flow fan is shut off; and during ventilation, the driving mechanism drives the baffle door so as to make the baffle door close the first pipeline, and the axial flow fan is turned on. Compared with the prior art, the present invention has the advantages of ventilation efficiency, good ventilation effect, etc.