NOx Catalyst Regeneration via Gas Abrasive Blasting
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Solution Overview
Problem
Existing methods for regenerating NOx removal catalysts in flue gas NOx removal apparatuses are cumbersome and prone to self-breakage, and fail to uniformly grind the inner walls of the catalyst along the flow path direction.
Innovation Solution
A method involving an upstream fixing member with an expanded cross-sectional area and a downstream fixing member with a fixed cross-sectional area, combined with a mixing part for abrasive and gas, a screen member, and a classification and dust-collecting part to uniformly grind the inner walls of the NOx removal catalyst through-holes without breaking the catalyst.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical grinding methods are used to remove deteriorated parts and contaminants, then the catalytic performance is improved, but the operation becomes cumbersome and self-breakage or damage of the catalyst occurs
Solution Approach 1:
The patent replaces complex mechanical grinding operations with a simplified gas flow-based abrasive blasting system. Gas containing abrasive particles is introduced to flow through the catalyst, automatically removing contaminants without requiring cumbersome mechanical equipment or manual operations.
Solution Approach 2:
The catalyst regeneration process is designed to be self-performing. The gas flow carrying abrasive particles automatically passes through the catalyst structure, enabling the catalyst to clean itself without external mechanical intervention or complex operational procedures.
2Reliability
If physical grinding methods are used to remove deteriorated parts, then the active surface is exposed, but self-breakage or damage of the catalyst occurs during the process
Solution Approach 1:
The patent replaces direct mechanical contact grinding with a fluid-based abrasive blasting method. Gas carrying abrasive particles flows through the catalyst, achieving surface cleaning without the high mechanical stresses that cause catalyst breakage and damage.
Solution Approach 2:
The patent changes the physical state and delivery method of the abrasive from solid mechanical contact to suspended particles in gas flow. This parameter change allows the abrasive to remove contaminants through controlled particle impact rather than direct mechanical force, preserving catalyst integrity.
3Manufacturing precision
If conventional grinding methods are used, then the surface is renewed, but the target catalyst cannot be uniformly ground along the flow path direction
Solution Approach 1:
The patent replaces mechanical grinding systems that create non-uniform surfaces with a gas flow-based abrasive blasting system. The gas flow distributes abrasive particles uniformly throughout the catalyst structure, ensuring consistent surface renewal along the entire flow path direction.
Solution Approach 2:
The patent uses pneumatic principles to deliver abrasive particles through gas flow. The pressurized gas carries the abrasive uniformly through the catalyst structure, ensuring even distribution and uniform grinding action along the flow path, which mechanical systems cannot achieve.
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 method allows for uniform regeneration of the NOx removal catalyst, preventing breakage and ensuring consistent grinding across all through-holes, thereby enhancing the catalyst's performance and extending its lifespan.
Implementation Method 1
a gas containing abrasive particles is caused to flow through through-holes of a target NOx removal catalyst 1, to thereby grind inner walls of through-holes of the NOx removal catalyst 1
Data Source
AI summary
A method for regenerating an NOx removal catalyst, which includes connecting an upstream fixing member (10) to one end of a member to be ground, and connecting a downstream fixing member (20) to the other end; connecting a mixing part (40) for mixing an abrasive with a gas to an upstream portion of the upstream fixing member, and disposing a screen member in the expanded part, and connecting a classification part (70) and a dust-collecting part (80) to the downstream fixing member; and transferring the abrasive which has been mixed with the gas from the mixing part to the upstream fixing member, reducing the flow rate of the mixture in the expanded part, subsequently, causing the mixture to pass through the through-hole of the NOx removal catalyst and the downstream fixing member, and then collecting dust by means of the dust-collecting part via the classification part.