Powder Fuel Supply Apparatus Flow Velocity Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The existing powder fuel supply systems in gasification furnaces face challenges in reliably detecting and recovering from decreases in powder fuel flow velocity, which can lead to sedimentation and conveyance defects, causing wear on burner tips and potential leakage due to inadequate radiation blocking and increased temperature.
Innovation Solution
A powder fuel supply apparatus with a distributor branching fuel into multiple tubes, each equipped with a resistor for pressure loss measurement and a control unit to determine flow velocity, along with an inert gas additional supply unit to maintain flow rates and prevent sedimentation, and a temperature measuring unit to monitor downstream end temperatures for accurate detection and recovery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If the flow velocity of powder fuel is reduced to operate with multiple coal types, then adaptability is improved, but the powder fuel may sediment in the conveyance tube causing conveyance defects
Solution Approach 1:
The patent implements a feedback mechanism by measuring the differential pressure across a resistor in the branch tube and using this information to detect changes in powder fuel flow velocity. The control unit monitors the measured value and can adjust operations to maintain reliable conveyance when switching between different coal types, preventing sedimentation while preserving adaptability.
2Reliability
If the conveyance of powder fuel is stopped to purge the conveyance tube, then conveyance defects are removed, but the burner tip temperature rises accelerating wear
Solution Approach 1:
The patent applies preliminary action by detecting decreases in powder fuel flow velocity before complete sedimentation occurs. By measuring differential pressure and identifying flow velocity reductions early, the system can take preventive measures to maintain flow or perform minimal purging, avoiding complete stoppage and the associated burner tip temperature rise that accelerates wear.
3Reliability
If the flow velocity of powder fuel is increased to prevent sedimentation, then conveyance stability is improved, but the wear on the burner tip accelerates due to higher temperatures
Solution Approach 1:
The control unit uses feedback from differential pressure measurements to monitor powder fuel flow velocity continuously. This allows the system to maintain the minimum flow velocity needed to prevent sedimentation without excessive increases that would accelerate burner tip wear, optimizing the balance between conveyance stability and component protection.
4Measurement precision
If a resistor is added to measure pressure loss for flow velocity detection, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent uses differential pressure measurement across a resistor as an intermediary method to infer powder fuel flow velocity. Instead of directly measuring flow velocity, the system measures pressure loss which correlates with flow conditions, providing accurate detection while using a relatively simple resistor component that can be integrated into the existing branch tube structure.
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 enables timely and accurate detection of flow velocity decreases, preventing sedimentation and wear on burner tips by maintaining flow rates and ensuring continuous radiation blocking, thus enhancing operational stability and reducing maintenance needs.
Implementation Method 1
a resistor provided in each of the plurality of branch tubes, to apply pressure loss to powder fuel flow in the branch tube
Implementation Method 2
a pressure loss measuring unit for measuring a differential pressure generated by the resistor
Implementation Method 3
powder of char jetted toward the gasification furnace flows like a curtain to the burner tip, and blocks the radiation from inside the furnace to the burner tip
Implementation Method 4
the char sediments due to its gravity in the conveyance tube to generate a conveyance defect
Data Source
AI summary
Provided is a powder fuel supply apparatus comprising a distributor (84) that branches supplied powder fuel to a plurality of branch tubes (82), a plurality of burners (126a) connected to downstream ends (82a) of the plurality of branch tubes (82), respectively, to supply char into a gasification furnace that gasifies the powder fuel, a flow nozzle (85) provided in each of the plurality of branch tubes (82), to apply pressure loss to char flow in the branch tube (82), a differential pressure gauge (86) that measures a differential pressure generated by the flow nozzle (85), and a control unit that determines decrease in flow velocity of the char flow based on the differential pressure obtained by the differential pressure gauge (86).