Slidable Ash Baffle Plates for Flue Gas Denitrification
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Solution Overview
Problem
Conventional flue gas denitrification apparatuses face issues with ash accumulation, thermal stress, and on-site welding requirements, leading to reduced denitrification performance and increased maintenance costs due to ash accumulation between catalyst blocks and the need for on-site welding.
Innovation Solution
A vertical downflow type flue gas denitrification apparatus with slidable ash accumulation baffle plates, featuring a hook structure and detachable support, which minimizes ash accumulation and absorbs thermal expansion without requiring on-site welding, using a first ash accumulation baffle plate with an angle structure and a second baffle plate with a U-shaped design for effective ash management.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If angle steel or round steel is welded and fixed to the frame body to prevent ash deposition, then ash accumulation is prevented, but thermal stress causes cracks and welding quality becomes difficult to control
Solution Approach 1:
The patent replaces the welding connection (mechanical joining) with a snap-fit connection system. The insertion portion of the baffle plate fits into the insertion hole of the frame body without welding, eliminating thermal stress and cracks while maintaining ash prevention functionality. This substitution of connection method resolves the contradiction between preventing ash accumulation and ensuring welding quality.
Solution Approach 2:
The patent changes the connection parameter from permanent welding to detachable snap-fit connection. This parameter change allows the baffle plate to be installed and removed without thermal processing, avoiding welding quality issues while still effectively preventing ash accumulation through proper mechanical engagement.
2Object-affected harmful factors
If angle steel or round steel is welded to prevent ash deposition, then ash accumulation is reduced, but on-site welding increases installation time and cost
Solution Approach 1:
The patent replaces time-consuming on-site welding operations with a quick snap-fit connection system. The baffle plate with insertion portion can be rapidly installed by simply fitting it into the insertion hole, dramatically reducing installation time while maintaining effective ash prevention.
Solution Approach 2:
The baffle plate is designed with pre-formed insertion portions that are prepared in advance during manufacturing. This preliminary action eliminates the need for on-site welding or complex assembly operations, allowing for rapid installation by simply snapping the pre-prepared components into place.
3Object-affected harmful factors
If welded protective equipment is used, then ash deposition is prevented, but thermal expansion causes cracks and reduces reliability
Solution Approach 1:
The patent replaces welded connections with snap-fit connections that accommodate thermal expansion. The detachable connection allows for movement and expansion without creating stress concentrations that would lead to cracks, maintaining structural integrity under thermal cycling conditions while preventing ash deposition.
Data Source
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AI summary
Disclosed is a vertical downflow type flue gas denitrification apparatus which has a plurality of catalyst blocks 1, each incorporating a catalyst unit 2, provided therein, is provided with a first ash accumulation baffle plate 9 and a second ash accumulation baffle plate 10 which are slidable into a gap between catalyst blocks 1, 1, 1 adjacent to each other, and processes an exhaust gas emitted from a combustor and turned to a vertical downflow, the denitrification apparatus having a simple configuration where the ash accumulation baffle plates 9, 10 prevent ash or the like from being accumulated in the gap between the catalyst blocks 1, 1, the thermal expansion of the ash accumulation baffle plate 9, 10 can be absorbed even under the operating conditions which produce a change in temperature, and charging and replacing the catalyst in the catalyst blocks 2 are possible without on-site welding of the ash accumulation baffle plates 9, 10.