In-Flue Fly Ash Collection with Curved Flow Baffles
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Solution Overview
Problem
Existing fly ash removal systems in thermal power generation systems require additional space and cause severe erosion and abrasion to downstream equipment due to the large size of particles exceeding 150 μm, leading to economic losses.
Innovation Solution
A fly ash removal device comprising a flow baffle, flow guiding component, and collecting component arranged in the flue, which diverts and guides particles into a collecting component without requiring additional space, using a curved plate structure to facilitate particle collection and integration with a spill-proof component to prevent splashing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a high-temperature electrostatic precipitator or cyclone separation precipitator is used for fly ash removal, then fly ash can be effectively removed, but a large amount of additional space is required
Solution Approach 1:
The fly ash removal device is nested within the existing outlet channel structure of the boiler system. The flow baffle, flow guiding component, and collecting component are arranged within the available space of the outlet channel, utilizing the existing structural envelope rather than requiring external installation space.
Solution Approach 2:
The device transitions from conventional horizontal or vertical large-footprint configurations to a three-dimensional arrangement within the outlet channel. The flow baffle protrudes into the flue gas flow path, creating a compact removal mechanism that utilizes the channel's cross-sectional area rather than requiring additional linear space.
2Device complexity
If fly ash is not removed, then the system structure remains simple, but severe erosion and abrasion occurs to downstream equipment causing economic loss
Solution Approach 1:
The outlet channel is segmented into functional zones by the flow baffle: a first outlet channel section for fly ash removal and a second outlet channel section for clean flue gas passage. This segmentation isolates the fly ash removal function from the main gas flow path, protecting downstream equipment while maintaining overall system simplicity.
Solution Approach 2:
The flow guiding component acts as an intermediary element that redirects particles from the main flue gas flow toward the collecting component. This intermediary mechanism enables effective particle capture without requiring complex equipment, achieving protection against erosion through a relatively simple structural addition.
3Reliability
If a flow baffle with protruding diversion surface is used to divert particles, then particle collection efficiency improves, but flow resistance increases
Solution Approach 1:
The flow baffle features a curved diversion surface that smoothly redirects flue gas and particles rather than creating abrupt directional changes. This curved geometry reduces flow separation and turbulence, minimizing energy loss while maintaining effective particle diversion toward the collection zone.
Solution Approach 2:
The angle and curvature parameters of the diversion surface are optimized to balance particle diversion effectiveness with flow resistance minimization. By adjusting these geometric parameters, the system achieves adequate particle collection efficiency while keeping the increase in flow resistance within acceptable limits.
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
The device effectively removes fly ash with minimal space requirements, reducing resistance and energy consumption, and prevents particle splashing, thereby improving the efficiency and reducing labor intensity.
Implementation Method 1
a flow baffle having a diversion surface that protrudes towards the flue gas
Implementation Method 2
some particles in the flue gas flowing towards the second end of the flow baffle flow onto the flow guiding component from the diversion surface
Data Source
AI summary
Provided is a fly ash removal device for a flue gas, including a fly ash collection assembly adapted to be arranged in a flue. The fly ash collection assembly includes: a flow baffle, a flow guiding component, and a collecting component.