Fluidized Bed Gas Withdrawal for Primary Supply Failure
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Solution Overview
Problem
The risk of fluidized bed apparatus malfunction due to the collapse of the fluidized bed when the primary fluidizing gas supply fails, particularly in the absence of ambient air, leading to potential ammonia leakage and undesired reactions within the wind box.
Innovation Solution
A fluidized bed apparatus and method that includes a pump system, such as an active or passive ejector, to withdraw remaining fluidizing gases from the fluidizing bottom upon detection of a failure in the primary fluidizing gas supply, ensuring continued operation by using ammonia as a secondary fluidizing gas and incorporating a secondary gas injection system to maintain combustion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a primary fluidizing gas supply system is used, then efficient combustion and fluidization are achieved, but the system becomes vulnerable to malfunction when the primary supply fails
Solution Approach 1:
The system changes the fluidizing gas parameter from a single primary source to multiple alternative sources (secondary fluidizing gas), allowing substitution when the primary source fails. This parameter change ensures continuous operation by switching between different gas supply modes.
Solution Approach 2:
The invention prepares compensatory measures in advance by providing a secondary fluidizing gas supply system that activates when the primary supply fails. This prior cushioning prevents system collapse and maintains fluidization stability during primary supply disruptions.
2Reliability
If ammonia is stored in the wind box for backup fluidization, then system reliability improves, but undesired reactions and leakage risks occur when primary supply fails
Solution Approach 1:
The invention extracts ammonia from the wind box storage and introduces it directly into the reaction chamber through dedicated injection means. This separation prevents ammonia from remaining in the wind box where it could cause undesired reactions or leakage, while still providing backup fluidization capability.
Solution Approach 2:
The invention introduces an intermediary injection system that mediates between the ammonia storage and the reaction chamber. This intermediary mechanism controlledly delivers ammonia only when needed, preventing direct contact between ammonia and the wind box environment that would cause harmful effects.
3Object-generated harmful factors
If ammonia is injected directly into the reaction chamber, then harmful effects are reduced, but additional injection infrastructure increases device complexity
Solution Approach 1:
The injection means are designed to serve multiple functions: they can introduce secondary fluidizing gas for fluidization purposes and also serve as a pathway for ammonia injection when needed. This multi-functionality reduces the need for separate dedicated infrastructure, thereby limiting complexity increase.
4Object-generated harmful factors
If the fluidized bed collapses due to primary gas failure, then ammonia leakage and undesired reactions are prevented, but combustion continuity is disrupted
Solution Approach 1:
The invention performs preliminary action by pre-positioning secondary fluidizing gas sources and ammonia injection means ready for immediate activation. When primary supply fails, these pre-prepared systems activate without delay to maintain fluidization and prevent bed collapse, ensuring continuous combustion operation.
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
Prevents undesired reactions and leakage by actively or passively removing residual fluidizing gases, maintaining stable operation even when the primary fluidizing gas supply fails, thus avoiding apparatus malfunction.
Implementation Method 1
a pump system, in particular having a suction line connected to the wind box
Implementation Method 2
A fluidized bed apparatus and method that includes a pump system, such as an active or passive ejector
Implementation Method 3
a first fluidizing agent source (6) being connected to the fluidizing bottom (3) and a second fluidizing agent source (7) being connected to the fluidizing bottom (3), wherein the fluidized bed apparatus comprises a pump system (8) connected to the fluidizing bottom (3) for withdrawing fluidizing gas from the fluidizing bottom (3)
Implementation Method 4
a method for combusting carbonaceous fuel in a fluidized bed reactor
Data Source
Figure 1
AI summary
The invention relates to a fluidized bed apparatus, comprising a fluidized bed reactor (1), the fluidized bed reactor (1) having a reaction chamber (2), a fluidizing bottom (3) at the bottom of the reaction chamber (2), at least one reactant supply (4) above the fluidizing bottom (3), at least one source (5) for a reactant being connected to the reactant supply (4), a first fluidizing gas source (6) being connected to the fluidizing bottom (3), a second fluidizing gas source (7) being connected to the fluidizing bottom (3), wherein the fluidized bed apparatus comprises a pump system (8) connected to the fluidizing bottom (3) for withdrawing fluidizing gas from the fluidizing bottom (3).