Denitration Reactor Duct Layout for Dust Clogging Control
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Solution Overview
Problem
Existing denitration devices in cement plants face issues with highly adherent dust accumulation, leading to clogging and increased maintenance costs and reduced operating efficiency.
Innovation Solution
A denitration device with a specific channel design featuring a hopper, weir, and soot blower system to manage dust flow, combined with a denitration reactor containing a screen plate and fixed bed catalyst, ensuring linear flow velocities and catalyst aperture sizes to minimize dust accumulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional denitration device is used, then denitration function is provided, but highly adherent dust accumulates and causes clogging
Solution Approach 1:
The patent extracts the dust removal function from the denitration reactor by adding a separate dust collector at the inlet. This separates the dust collection function from the denitration function, allowing the denitration catalyst to operate without dust accumulation while the dust collector handles particle removal independently.
Solution Approach 2:
The dust collector is positioned upstream of the denitration reactor to perform preliminary dust removal before the gas enters the catalyst bed. This preliminary action prevents dust from reaching the catalyst, avoiding clogging and maintaining continuous operation.
2Object-generated harmful factors
If dust collection is enhanced, then dust accumulation is reduced, but device complexity increases
Solution Approach 1:
The dust collector is designed with locally optimized features at the inlet region where dust accumulation is most problematic. The collector uses a simple conical or angled structure with appropriate slope angles (15-45 degrees) to facilitate dust settling, applying dust collection enhancement only where needed rather than throughout the entire system.
3Object-generated harmful factors
If linear flow velocity is increased to prevent dust accumulation, then dust settling is reduced, but pressure loss increases
Solution Approach 1:
The channel is segmented into different sections with different flow velocity requirements. The inlet section has higher velocity to prevent dust accumulation, while the denitration reactor section maintains optimized velocity for catalytic conversion. The dust collector section allows lower velocity for dust settling, dividing the flow path to satisfy different velocity requirements in different zones.
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 prevents clogging, maintains high operating rates, and reduces maintenance costs by efficiently managing adherent dust, thereby enhancing denitration efficiency.
Implementation Method 1
a soot blower is disposed in a portion of the inlet duct (2) and/or the denitration reactor, where dust tends to accumulate
Implementation Method 2
the inlet duct has on an inlet side a channel where the exhaust gas flows upward and on an outlet side a channel where the exhaust gas flows downward
Implementation Method 3
a hopper is disposed in a lower portion of the upward flowing channel
Implementation Method 4
a fixed bed including a denitration catalyst... decomposes NO x (NO and NO 2) into nitrogen (N 2) and water (H 2 O) by the denitration agent
Data Source
Figure 1
Figure 2~3
Figure 4~6
AI summary
A denitration device includes: an inlet duct; a denitration reactor; and an outlet duct. The denitration device allows an exhaust gas from a kiln or a furnace to flow to the inlet duct, the denitration reactor, and the outlet duct in this order. The denitration reactor has a channel through which the exhaust gas flows at a linear flow velocity of 5 to 8 m/sec in a substantially vertical direction, the channel is internally provided with a screen plate and a fixed bed including a denitration catalyst in this order along a flow direction, and the fixed bed has an aperture of not less than 7 mm. The inlet duct has on an inlet side a channel where the exhaust gas flows upward and has on an outlet side a channel where the exhaust gas flows downward, a cross-sectional area of a channel between the upward flowing channel and the downward flowing channel is smaller than a cross-sectional area of the upward flowing channel, a hopper is disposed in a lower portion of the upward flowing channel, and a weir is disposed around an edge of the hopper on a side near the downward flowing channel. A soot blower is disposed in a portion of each channel of the inlet duct and the denitration reactor, where dust tends to accumulate.