8-What do you mean by DP test in AFBC Boilers? It is the test carried out before the light up of Boiler to ensure the healthiness of air nozzle & bed plate.
What is DP test of boiler?
Dye penetrant inspection (DP), also called liquid penetrate inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to check surface-breaking defects in all non-porous materials (metals, plastics, or ceramics).
How does Afbc boiler work?
In afbc boiler fluidization bed combustion is method of burning of solids fuel in which the fuel is continuous fed into hot fluidized bed of inert bed material. Inert fluidized bed is heated to the ignition temperature of fuel and fuel is supplied continuously into the bed.
What are the two parts of a boiler?
Key Components of Boilers are:-
- Burner – The burner is the component of boiler that provides the heat that heats the water of system.
- Heat exchanger – The heat exchanger of boiler allows the heat from the burner to heat the water in system.
How do you perform a DP test?
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- Penetrant. Apply the penetrant to the test area. Allow the penetrant to dwell for 10-30 minutes.
- Developer. Apply the developer to the test area. Allow the developer to dwell for 10-60 minutes.
- Inspect. Examine the part for any bright, clear indications.
What is DP test kit?
DP kit consist of 3 Different items… 1. DEVELOPER SKD – S2: is ready to use suspension of white developing particles in a fast-drying solvent. CLEANER/REMOVER SKC-I: is a clear, flammable solvent, lighter than water. SKC – I is used as a pre-cleaner a post cleaner and a penetrant remover.
What is IBD in boiler?
This type of valve removes alkaline earths, phosphates or polyacrylates that may form a sludge at the bottom of the lowest boiler drum and can affect heat transfer. The Intermittent Blow-Down Valve is mostly a quick opening valve, utilizing spring aided levers.
Why it is called as Afbc boiler?
Atmospheric Fluidized Bed Combustion System (AFBC) Atmospheric Fluidized bed combustion boilers are most common and simple FBC boiler where combustion takes place at layer of sand or sand like material. Bubbling of sand bed is created with the help of fluidizing air of velocity 1.2-3.7 m/sec.
What is the principle of FBC?
Fluidized bed combustion (FBC) is a combustion technology used to burn solid fuels. In its most basic form, fuel particles are suspended in a hot, bubbling fluidity bed of ash and other particulate materials (sand, limestone etc.)
What is AFBC boiler?
Atmospheric Fluidized Bed Combustion (AFBC) boilers are those, which have the potential to use alternative fuel sources such as coal, wood, or waste or any other low grade fuel, and are able to reduce and control nitrogen oxide (NOx) and sulphur dioxide (SO2) emissions. 2-List down the advantages of FBC boilers over other boilers?
What is fluidization bed combustion in a boiler?
In afbc boiler fluidization bed combustion is method of burning of solids fuel in which the fuel is continuous fed into hot fluidized bed of inert bed material. Inert fluidized bed is heated to the ignition temperature of fuel and fuel is supplied continuously into the bed.
What is the use of fly ash in a FBC boiler?
The fly ash of the FBC boiler is more than other boilers. The combustion efficiency can be increased by utilizing the fly ash in some units. It is happening because the speed of the particle is very high. The fly ash travels with the flue gases, which is taken out at various stages from the FBC unit.
What is an inert fluidized boiler?
Inert fluidized bed is heated to the ignition temperature of fuel and fuel is supplied continuously into the bed. The fuel burn rapidly and the bed attain a uniform temperature. In afbc boiler combustion is take place at about 850- 950 degree Celsius.
