A secondary air damper is a control device that is commonly used in boilers to regulate the flow of air into the combustion chamber. The primary purpose of the secondary air damper is to provide the necessary amount of oxygen for the fuel to burn efficiently, while also minimizing the production of harmful emissions such as carbon monoxide.
There are several types of secondary air dampers, including manual and automatic control systems. Manual control systems typically involve a lever or handle that can be manually adjusted to open or close the damper and regulate the flow of air. Automatic control systems, on the other hand, use sensors and control algorithms to adjust the damper based on real-time readings of factors such as the temperature and pressure of the boiler.
One of the key benefits of using a secondary air damper is that it helps to optimize the efficiency of the boiler by providing the right amount of air for the fuel to burn. This can help to reduce energy consumption and lower operating costs. In addition, by ensuring that the fuel is burned efficiently, the secondary air damper also helps to reduce the production of harmful emissions, which is beneficial for both the environment and human health.
There are several factors that can affect the performance of a secondary air damper, including the type of fuel being used, the size and design of the boiler, and the ambient temperature and humidity. It is important to regularly monitor and maintain the secondary air damper to ensure that it is functioning correctly and providing the optimal flow of air for efficient combustion.
In conclusion, the secondary air damper is a crucial control device in boilers that helps to regulate the flow of air into the combustion chamber. By providing the right amount of oxygen for the fuel to burn efficiently, the secondary air damper helps to optimize the efficiency of the boiler, reduce energy consumption, and minimize the production of harmful emissions. Proper maintenance and monitoring of the secondary air damper are important to ensure that it is functioning correctly and providing the optimal performance of the boiler.
CONTROL OF SECONDARY AIR DAMPER
The coal nozzle elevations are designated as A,B,C,D,E,F elevation from bottom to top, the bottom end air and top end air elevations as AA and FF respectively. Louvre dampers named as secondary air dampers each of which is operated by an individual damper drive cylinder located at the side of the wind box. This paper was made in a Coal Based Thermal power plant at tuticorin, TTPS as the existing is running on DCS system. When there is no fuel input in any of the above elevations then the dampers will be in minimum opening position. This paper was made in a Coal Based Thermal power plant at tuticorin, TTPS as the existing is running on DCS system.
Secondary air damper control in boiler
The auxiliary air nozzles in between coal elevations are designated as elevations AB,BC,CD,DE,EF. Simultaneously, the auxillary air dampers associated with coal or oil elevations not in service close in timed sequence starting with the upper elevation of dampers and progressing to the lowest elevation. The bottom end air damper is normally kept open to a fixed predetermined position to reduce unburnt coal dust fall out. Fifty seconds after the coal feeders are removed from service, the associated fuel air dampers close. Delegate some of your assignments to our premium academic writers and concentrate on the most important things! The FD and ID fans develop enough draft to move the tremendous volume of air and gases through the flue gas ducts and stack to atmosphere maintaining a balanced draft in the furnace.
Secondary Air Damper Control in Boiler Engineering Study Affiliates Blog
Each pair of coal nozzle elevations is served by one elevation of oil burners 4 nos. Thus this project controls dampers based on arduino coding And its visually displayed in visual basics. All the auxillary air dampers maintain the status quotient upon a boiler trip and will open fully when both the FD fans are off. When the unit load exceeds 30% MCR, the differential pressure set point is changed and ramps to a higher setting approx. Thus 12 oil guns, non retractable type, are accommodated in the three elevations AB, CD and EF.
Secondary Air Damper Control in Boiler
Elevation AB dampers are kept at a fixed opening when light oil is being fired. Visual Basic was derived from BASIC and enables the rapid application development RAD of graphical user interface GUI applications, access to databases using Data Access Objects, Remote Data Objects, or ActiveX Data Objects, and creation of ActiveX controls and objects. A programmer can put together an application using the components provided with Visual Basic itself. All this proportioning of the air requires tools of adjustment available to the furnace operator. Programming is simple by the graphical programming language. Visual Basic was derived from BASIC and enables the rapid application development RAD of graphical user interface GUI applications, access to databases using Data Access Objects, Remote Data Objects, or ActiveX Data Objects, and creation of ActiveX controls and objects.
Secondary Air Damper Control in Boiler
The curtain of secondary air militates against the formation of slag on the furnace walls. This form shows all the elevation of dampers and denotes the damper that is open and the percentage of damper opening is also shown. Keywords- Secondary air dampers, Draft system, ARDUINO, Power plant TTPS , Software control. The algorithm for visual basics coding are as below. In this proposed work, design and development of controlling Secondary air dampers in a draft system of a power plant which is presently working on DCS technique has been accomplished by using high computing software ARDUINO and results has been shown with suitable simulation in VISUAL BASICS. Otherwise they open and close with the rest of the aux air dampers. The simulation results showing the air dampers status variation according to the various input set points is as follows: The amount of coal input given is shown in the above fig 5.
A form of visual basics personalizes button design and layout, with the virtual knobs and switches to struck the friendly human, intuitive control interface makes vivid, so that the operators are involved in the operation easier to control the process and results at a glance. The goal of this work is to control the air dampers in a different way according to the unit load thereby increasing the boiler efficiency and to reduce the pollution. Auxiliary air dampers: During the furnace purge period and initial operations up to 30% boiler loading all elevations of auxiliary and end air dampers modulate to maintain a predetermined approx. Thus this project controls dampers based on arduino coding And its visually displayed in visual basics. The coal nozzle elevations are designated as A,B,C,D,E,F elevation from bottom to top, the bottom end air and top end air elevations as AA and FF respectively. Software Description: The software coding was developed based on several conditions on which the secondary air damper openings depend.
Visual Basic was derived from BASIC and enables the rapid application development RAD of graphical user interface GUI applications, access to databases using Data Access Objects, Remote Data Objects, or ActiveX Data Objects, and creation of ActiveX controls and objects. The fuel coal air dampers open fully, when both FD fans are off or when the boiler trips on master fuel trip. As already mentioned the percentages of secondary air damper opening depend on the amount of fuel input to the furnace. Then the freeduino board in which the AT MEGA 8. All the auxillary air dampers maintain the status quotient upon a boiler trip and will open fully when both the FD fans are off. In addition to that reactive power produced for corresponding load is also calculated. All coal air dampers are normally closed.
