Friends, today in this article we will learn about the working of the pulverized coal fuel combustion system. I am going to give information about all this in a very good way. So let’s start.
Pulverized Fuel Firing
The arrangement of a central system is shown in the picture.
Coal Pulverizing Mill
Coal pulverizing mill is an important part of the pulverized fuel system. The function of this mill is to break the solid coal and grind it to convert it into powder. Apart from this, there are also arrangements for drying wet coal and separating pulverized coal. Pulverization mills are of the following types –
(1) Hammer mill
(ii) Roller mill
(iii) Ball mill
Pulverized coal burners
The furnaces used for pulverized fuels do not have a grate, rather the fuel is burnt in a suspended state. The pulverized coal and primary air reach the burner, from where they are poured into the furnace chamber in the form of spray. There is also a provision to send pre-heated secondary air (generally 350 to 400°C) separately in the burner. The fuel coming out of the burner in the form of spray burns in the chamber maintaining a flame.
Types of burners
The following types of burners are mainly used for pulverized coal:
Stream flow
Turbulent flow
Stream flow burner is also called long flame or U-flame burner.
Advantages of pulverized fuel combustion
(i) The mixture of fuel and air is easily formed.
(ii) It becomes possible to send air in the desired quantity.
(iii) The fuel burns well.
(iv) Even low grade fuel can be burnt efficiently.
(v) Control of the amount of fuel burning is quick and easy.
(vi) Fuel burns efficiently.
(vii) Capacity of the furnace can be easily increased.
(viii) Construction of the furnace becomes simple.
(ix) Lumps of fuel (clinker) do not form.
(x) As the pulverization system is outside the furnace, the plant does not have to be cooled down for its repair.
Disadvantages of pulverized fuel burning
(i) Chances of slugs forming on boiler pipes and furnace walls increase.
(ii) Cost of additional equipment and operation is more in pulverization.
(iii) Amount of ash increases with burnt gases, which requires additional equipment to separate it.
(iv) Cost of maintenance of furnace walls increases.
What did you learn today :-
Now you must have known the working of the pulverized coal fuel combustion system. You must have got the answer to all these questions well.
I hope you liked the information given by me. If you have any question/suggestion in your mind, then you can tell me by commenting below. I will definitely answer your comment. If you liked this post, then you can also share it with your friends and relatives.