Pneumatic Conveying Switching Unit for Automatic Blockage Clearance
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Solution Overview
Problem
Existing pneumatic conveying systems for lumpy or powdered fuels face challenges in automatically clearing blockages in the central suction line, requiring extensive manual maintenance and limiting the permissible height difference to prevent blockages, which is inconvenient and often leads to longer stub lines.
Innovation Solution
Incorporating a connection on the switching unit that allows air to be sucked in the normal conveying direction directly into the central suction line without flowing through a branch line, providing higher delivery pressure and preventing additional granulate from entering the clogged area, enabling automatic blockage removal through a free flow path connected to the central supply air line, and optionally reversing the air flow direction to clear blockages.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the central suction line is designed to allow automatic blockage clearance through a free flow path, then blockage clearance capability is improved, but the device complexity increases due to additional connections and flow path configurations
Solution Approach 1:
The switching unit is designed to perform multiple functions: normal pellet conveying and blockage clearance. The free flow path connection enables the switching unit to redirect air flow for clearing blockages in the central suction line, making the same component serve dual purposes without requiring entirely separate systems.
Solution Approach 2:
The free flow path acts as an intermediary element that connects the switching unit to the central suction line, enabling automatic blockage clearance. This intermediate connection allows air to be redirected through the blocked area without requiring direct manual intervention or complete system disassembly.
2Reliability
If the permissible height difference of the central suction line is limited to prevent blockages, then blockage occurrence is reduced, but the stub line length increases leading to longer conveying paths
Solution Approach 1:
The system performs preliminary blockage clearance by establishing a free flow path that can automatically clear blockages before they cause system failure. The switching unit is pre-configured with the capability to redirect air flow for clearance, acting in advance to prevent prolonged blockage conditions.
Solution Approach 2:
Instead of preventing blockages by strictly limiting height differences (which causes longer stub lines), the invention inverts the approach by allowing blockages to occur but providing an automatic clearance mechanism. The free flow path enables air to flow in the opposite direction through the blockage, clearing it rather than preventing its formation.
3Ease of repair
If manual maintenance is required to clear blockages in the central suction line, then maintenance thoroughness may be improved, but the loss of time and productivity increases
Solution Approach 1:
The system performs self-service blockage clearance through the automatic free flow path mechanism. When a blockage occurs in the central suction line, the switching unit automatically redirects air flow through the free flow path to clear the blockage without requiring manual intervention, enabling the system to service itself.
Solution Approach 2:
The system incorporates feedback through the switching unit that detects blockage conditions and automatically responds by redirecting air flow through the free flow path. This feedback mechanism monitors the conveying system's status and triggers the clearance operation when blockages are detected, reducing the need for manual maintenance.
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 solution allows for reliable automatic clearance of blockages in the central suction line, reducing the need for manual intervention and minimizing the length of stub lines, ensuring efficient and uninterrupted operation of the pneumatic conveying system.
Implementation Method 1
a pneumatic conveying system to the combustion unit or an intermediate storage tank located upstream of it. The pneumatic conveying system comprises several suction probes, a switching unit, a suction turbine, a solids separator, and a system of pipes and hoses.
Implementation Method 2
They are located at the bottom of the storage room and each is supplied with an air intake spur and a suction spur. At each suction probe, air flows from the connected air intake spur into the storage room and from there into the suction spur connected to the probe. This airflow carries pellets from the storage room into the suction spur.
Implementation Method 3
a solids separator for the pellets in the suction air stream
Data Source
Figure 1
AI summary
The system has a pneumatic conveyor line with several suction probes (2) that are arranged in a storage room (1) and are connected to a air supply branch line (9) and a suction branch line (3). The branch lines lead to a switching unit (4) through which air supply branch line and suction branch line are passed. The switching unit has connection to the terminals of the branch lines (3, 9) that are connected to a central suction line (5) through the switching unit and in which a free flow path is present. An independent claim is included for a method for operating system for loading furnace.