Packed Bed Scrubber for Gas Turbine Exhaust Recirculation
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Solution Overview
Problem
Existing gas turbine systems face challenges in effectively recirculating exhaust gases due to high levels of pollutants like SOx and other impurities, which can cause turbine fouling and corrosion, requiring improved treatment methods to meet strict quality standards for recirculation.
Innovation Solution
A method involving a packed bed gas cooling and cleaning device that contacts recirculated exhaust gas with a cooling and absorption liquid to lower temperature and remove contaminants like SO2, SO3, and other impurities, using a pH-controlled liquid with a low solids concentration to enhance efficiency and reduce fouling risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If exhaust gas is recirculated to the gas turbine, then CO2 concentration in exhaust gas is increased, but turbine fouling and corrosion occur due to SOx and other impurities
Solution Approach 1:
The harmful components (SOx, particulates, water) are extracted and removed from the exhaust gas stream through a scrubber system before recirculation, allowing the beneficial CO2 enrichment to proceed without the detrimental impurities
Solution Approach 2:
A scrubber system acts as an intermediary between the exhaust gas and the gas turbine, treating the gas to remove harmful constituents while allowing the recirculated gas to serve its purpose of increasing CO2 concentration in the combustor
2Object-affected harmful factors
If exhaust gas is treated with liquid reagents in a scrubber, then contaminants are removed, but equipment complexity and operational requirements increase
Solution Approach 1:
The scrubber system performs multiple functions simultaneously: cooling the exhaust gas, removing SOx through chemical absorption, condensing water, and removing particulates, thereby reducing the need for separate treatment equipment
Solution Approach 2:
The pH of the liquid reagent is controlled and adjusted to optimize the removal efficiency of SOx and other acidic contaminants, allowing effective treatment with a relatively simple single-stage scrubber design
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
This approach efficiently removes contaminants, decreases the risk of corrosion and fouling, and allows for the reuse of condensate water, providing a cost-effective solution for improving gas quality and reducing equipment needs.
Implementation Method 1
the recirculated exhaust gas is contacted with a first cooling and absorption liquid in a first packed bed, so that the temperature of the recirculated exhaust gas is lowered
Implementation Method 2
contaminants are removed from the recirculated exhaust gas by contacting with a cooling and absorption liquid
Implementation Method 3
contacting recirculated flue gas, originating from a gas turbine, with a cooling and absorption liquid in a packed bed provides for efficient removal of contaminants such as SO2 and SO3
Data Source
AI summary
A method of operating a turbine unit, wherein recirculated exhaust gas is contacted with a cooling and absorption liquid in a packed bed. An exhaust gas treatment system for a turbine unit, wherein an exhaust gas recirculation line comprises a gas cooling and cleaning device having a packed bed for contacting the exhaust gas with a cooling and absorption liquid. A combined cycle power generating system, wherein an exhaust gas recirculation line comprises a gas cooling and cleaning device having a packed bed for contacting the exhaust gas from a gas turbine with a cooling and absorption liquid and wherein water utilized as a cooling medium for condensation of steam originating from a steam turbine, and the cooling and absorption liquid, are passed to a cooling tower.