Exhaust Gas Diffusion Module for Thermal Plant Startup Efficiency
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing exhaust gas treatment technologies in thermal power plants are inadequate, particularly during startup, as they fail to efficiently handle rapid changes in exhaust gas conditions such as flow rate, speed, and temperature, leading to insufficient pollutant removal.
Innovation Solution
An apparatus comprising a diffusion module, injection nozzles, a fluid supply system, and a catalyst module is used to guide exhaust gas toward the inner wall of a duct, allowing for intensive injection of a pollutant treatment fluid and effective catalytic treatment, even during startup conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional treatment facilities are used, then the structure is simple, but the treatment efficiency is insufficient during startup and rapid state changes
Solution Approach 1:
The treatment facility is divided into multiple functional modules: a diffusion module with spiral guide plates to create centrifugal flow, multiple injection nozzles positioned at different locations, and a catalyst module. This segmentation allows each component to perform its specific function optimally, improving overall treatment efficiency during dynamic operations.
Solution Approach 2:
The diffusion module uses spiral guide plates to dynamically adjust exhaust gas flow patterns, creating centrifugal forces that enhance mixing. The injection nozzles are positioned to deliver treatment fluid dynamically across different flow conditions, enabling the system to adapt to rapid state changes during startup and operation.
2Speed
If the injection nozzles are positioned to intersect the hub extension line, then the fluid injection is direct, but the contact time between treatment fluid and catalyst is insufficient
Solution Approach 1:
The injection nozzles are positioned off the central extension line of the hub, creating a radial offset. This dimensional change in nozzle positioning allows the treatment fluid to be injected into the centrifugal flow field at an optimal angle, extending the contact path and residence time between the fluid and exhaust gas without compromising injection speed.
3Productivity
If the exhaust gas flow is not guided toward the inner wall, then the flow path is direct, but the mixing between treatment fluid and exhaust gas is insufficient
Solution Approach 1:
The diffusion module incorporates spiral guide plates that curve the exhaust gas flow toward the inner wall of the duct, creating a rotational and centrifugal flow pattern. This curvature in the flow path enhances mixing between the treatment fluid and exhaust gas by increasing turbulence and contact area, while the spiral design optimizes the flow path length to achieve thorough mixing without excessive duct length.
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 apparatus achieves efficient treatment of exhaust gases by ensuring sufficient contact between the pollutant treatment fluid and catalysts, effectively reducing pollutants like nitrogen oxides, even at low temperatures and during frequent state changes in combined cycle power plants.
Implementation Method 1
a hub inserted into a center of the outer cylinder and guiding the exhaust gas in a centrifugal direction
Implementation Method 2
a catalyst module disposed at rear ends of the injection nozzles
Data Source
AI summary
An apparatus for treating exhaust gas of a thermal power plant according to the present invention includes: a diffusion module part controlling an exhaust gas flow between a duct disposed at a rear end of a gas turbine of the thermal power plant and the gas turbine to guide the exhaust gas flow toward an inner wall of the duct; a plurality of injection nozzles installed in a flow section in the duct in which the exhaust gas guided toward the inner wall of the duct from the diffusion module part flows, and protruding from the inner wall of the duct; a fluid supply pipe connected to the injection nozzles and extending outside the duct; a fluid supply part supplying a pollutant treatment fluid in liquid phase to the injection nozzles through the fluid supply pipe; and a catalyst module disposed at rear ends of the injection nozzles.