Stack Inlet Flap Design to Prevent Flue Gas Air Inflow
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Solution Overview
Problem
Conventional methods fail to safely and stably draw almost the total amount of flue gas into a CO2 recovering apparatus without using a blocking unit in the stack, leading to atmospheric inflow and potential damage to upstream facilities.
Innovation Solution
An air pollution control apparatus with a controlling unit that forms a serpentine channel, mixes, or suppresses inflow using density differences, or employs an opening/closing unit to manage flue gas and atmospheric flow within the stack, preventing discharge and inflow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a blocking unit such as a damper is provided in the stack to prevent atmospheric inflow, then atmospheric inflow is suppressed, but the upstream facility (boiler and gas turbine) is adversely influenced when the damper is closed during operation
Solution Approach 1:
The invention extracts the blocking function from the stack by providing a separate atmospheric inflow preventing unit in the flue gas channel downstream of the stack. This allows the stack to remain open for normal flue gas discharge while preventing atmospheric inflow through the separate unit that can be independently controlled and removed when not needed.
2Reliability
If no blocking unit is provided in the stack, then the upstream facility operation is not adversely influenced, but atmospheric inflow occurs when flue gas flow rate becomes low
Solution Approach 1:
The invention introduces an intermediary atmospheric inflow preventing unit with a blocking member that can be selectively positioned in the flue gas channel. This unit acts as a mediator between the open stack and the CO2 recovering apparatus, preventing atmospheric inflow when needed while allowing normal operation without interference.
3Productivity
If the stack has a short height and large inner diameter to facilitate flue gas discharge, then flue gas discharge is improved, but atmospheric inflow along the inner wall increases
Solution Approach 1:
The invention segments the flue gas channel into distinct regions by providing an atmospheric inflow preventing unit that creates a separate flow path. This segmentation allows the stack to maintain its short height and large diameter for efficient discharge while the preventing unit blocks the specific path along the inner wall where atmospheric inflow occurs.
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
Stably and safely draws almost all flue gas into the CO2 recovering apparatus, minimizing atmospheric inflow, maintaining high recovery rates, and preventing facility damage.
Implementation Method 1
a controlling unit that suppresses release of the flue gas outside from the stack and suppresses inflow of atmosphere to the stack
Data Source
Figure 1~2
Figure 3~4
Figure 5~6
AI summary
An air pollution control apparatus according to an embodiment of the present invention includes: a stack (15) that discharges flue gas discharged from a boiler outside; a blower (13) that is provided downstream of the stack (15) and draws in the flue gas; and a CO2 recovering apparatus (22) that recovers CO2 in the flue gas drawn in by the blower (13). The stack (15) includes a controlling unit that suppresses release of the flue gas outside from the stack (15) and suppresses inflow of atmosphere to the stack (15), and the controlling unit is an opening/closing unit (52) that is provided at an inlet (36) of the stack (15) through which the flue gas is fed into the stack (15) and that is openable only inward of the stack (15) .