Metering Tank Fluidized Bed for Gasifier Fuel Feed
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Solution Overview
Problem
Existing methods for pressurized gasification of pulverized fuels face issues with discontinuous loading of metering tanks, leading to pressure fluctuations that affect the pressure differential driving dust flow between the metering tank and gasification reactor, resulting in unreliable temperature control during the gasification process.
Innovation Solution
A method involving the formation of a dense fluidized bed in the metering tank with fluidizing gas and the use of auxiliary gas to regulate pressure differentials, ensuring a constant dust flow rate by introducing auxiliary gas into the transport lines and the head space of the metering tank, allowing for continuous and accurate metering of pulverized fuel into the gasification reactor.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If pulverized fuel is fed through pressurized sluice tanks to a metering tank, then the fuel can be transported under pressure to the gasification reactor, but pressure fluctuations occur that affect the pressure differential driving dust flow
Solution Approach 1:
A fluidized bed is introduced as an intermediary medium between the metering tank and the gasification reactor. This fluidized bed acts as a buffer that absorbs pressure fluctuations and maintains a stable pressure differential, ensuring reliable dust flow while preserving the high productivity of pressurized fuel transport.
Solution Approach 2:
The invention changes the physical state of the fuel from solid particles in a tank to a fluidized state in the bed. This parameter change allows the fuel to flow more smoothly and respond better to pressure differentials, stabilizing the system while maintaining efficient transport.
2Productivity
If the metering tank is filled alternately from operational bunkers, then the fuel supply can be maintained, but fluctuations in the filled level affect metering accuracy
Solution Approach 1:
The fluidized bed serves as an intermediary that decouples the fuel level in the metering tank from the actual fuel flow to the reactor. This allows the tank to be refilled alternately while the fluidized bed maintains consistent flow conditions, preserving metering accuracy during continuous operation.
Solution Approach 2:
The fluidized bed creates a dynamic system where fuel particles are in constant motion. This dynamic state allows the system to adapt to level fluctuations in the metering tank while maintaining stable flow characteristics, ensuring both continuous supply and accurate metering.
3Speed
If the dust stream flow velocity is increased to improve transport efficiency, then the dust can reach the reactor faster, but the pressure differential fluctuations become more pronounced
Solution Approach 1:
The fluidized bed acts as a buffer zone that absorbs the shock of high-velocity dust streams. It moderates the flow, reducing pressure differential fluctuations while maintaining the high speed necessary for efficient transport to the gasification reactor.
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 stabilizes the pressure differential and ensures a constant dust flow rate, maintaining metering accuracy and process reliability by compensating for fluctuations with auxiliary gas infeeds, enabling efficient operation of the gasification reactor.
Implementation Method 1
in the bottom of which a dense fluidized bed is formed by feeding in fluidizing gas through a turbulence plate
Implementation Method 2
the necessary amount of auxiliary gas is set by instruments with reference to the value obtained. The stream of auxiliary gas is preferably fed in near the inlet of each transport line
Data Source
AI summary
A method and device for metering and feeding pulverized fuels under pressure into gasification reactors, with the pulverized fuel being supplied alternately from an operational bunker through pressurized sluices to a metering tank, in the bottom of which a dense fluidized bed is formed by introducing fluidizing gas through a turbulence plate, with transport pipes immersed in the fluidized bed horizontally or vertically, by which the fluidized fuel is fed continuously through burners to a pressurized gasification reactor. By feeding in auxiliary gas in the immediate vicinity of the transport line inlet into the metering tank or the transport lines, the pressure differential between the metering tank and the gasification reactor is controlled and is utilized as a control parameter for pulverized fuel transport.