Denitration Control for Gas Turbine Cogeneration
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Solution Overview
Problem
The gas turbine cogeneration system faces challenges in quickly performing denitration operations when the hydrogen gas fuel co-firing ratio increases, leading to higher NOx emissions.
Innovation Solution
The system includes a denitration control part that generates control commands for the denitration device based on a NOx parameter correlated with NOx emissions at the turbine outlet, allowing for quick adjustment of reducing agent addition to maintain NOx emissions within target values.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the hydrogen gas fuel co-firing ratio is increased to reduce CO2 emissions, then the environmental benefit is improved, but the NOx emissions increase and require slower denitration response
Solution Approach 1:
The system performs preliminary calculation of the required reducing agent amount based on the hydrogen gas fuel supply amount before NOx emissions actually increase. The denitration control part generates a control command in advance by calculating the first addition amount of reducing agent based on the NOx parameter, enabling the denitration device to start operation before NOx reaches the target value, thus achieving quick response to NOx emission changes
2Speed
If the denitration response time is reduced to quickly follow NOx emission changes, then the emission control is improved, but the system complexity increases
Solution Approach 1:
The denitration control part performs preliminary calculation of the reducing agent addition amount based on the hydrogen gas fuel supply amount and NOx parameter before NOx emissions actually increase. This advance calculation enables quick denitration response without requiring complex real-time measurement and adjustment systems
Solution Approach 2:
The system uses the existing NOx parameter (which is already available from the control system) to calculate the required reducing agent amount. The denitration control part generates control commands using readily available data from the gas turbine control system, eliminating the need for additional complex measurement and control infrastructure
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 configuration enables rapid denitration operations in response to increased NOx emissions due to changes in hydrogen gas fuel co-firing ratios, effectively managing emissions and ensuring system efficiency.
Implementation Method 1
a heat recovery steam generator for generating steam using exhaust gas discharged from the turbine
Implementation Method 2
a denitration device for denitration of the exhaust gas by adding a reducing agent to the exhaust gas flowing through the heat recovery steam generator
Implementation Method 3
a combustor for burning fuel and generating high temperature combustion gas
Data Source
AI summary
A gas turbine cogeneration system includes a denitration control part for outputting to a denitration device a control command to set the amount of NOx emissions at a heat recovery steam generator outlet not more than a boiler outlet target value. The denitration control part is configured to generate the control command with reference to at least a first addition amount of a reducing agent obtained by calculation based on a NOx parameter which is a parameter correlated with the amount of NOx emissions at a turbine outlet.