What is meant by pulverized coal and why it can be used in blast furnace?
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Pulverized coal is the "powder form of blended coal". Blended coal:- In India lower grade of coal are mixed with higher grade of coal which is exported from Australia, in order to insure that, the blended coal should have high calorific value and low ash content. Here, A question arises; why only pRead more
Pulverized coal is the “powder form of blended coal”.
Blended coal:- In India lower grade of coal are mixed with higher grade of coal which is exported from Australia, in order to insure that, the blended coal should have high calorific value and low ash content.
Here, A question arises; why only powder form blended coal is injected in blast furnace?
Answer; Powder from of blended coal provides more surface area for chemical reaction than solid coal, As we study in surface chemistry.
Why pulverized coal injection is used in blast furnace?
Answer; The purpose of pulverized coal injection(PCI) is:-
1. Since preparation of Metallurgical coke is a costly process as compared to pulverized coal, so to reduce the overall cost of iron making, PCI is used.
2. PCI help in generation and maintenance of RAFT(Raceway adiabatic flame temperature) which is important to sulfur reduction.
3. Carbon of PCI react with CO2 gas of burnt coke in tuyere region to produce CO gas, which take part in the indirect reduction of haematite in bosh region.
C + CO2 = 2CO
3Fe2O3 + CO = 2Fe3O4 + CO2
Fe3O4 + CO = 3FeO + CO2
4. It also provides strength to bed of the burden in furnace.
See lessPulverised coal is the powder form of coal. It is injected in BF through it's tuyures to save the coke. the pulverised coals burns and provides heat directly in the tuyeres area and save extra coke to burn.
Pulverised coal is the powder form of coal. It is injected in BF through it’s tuyures to save the coke. the pulverised coals burns and provides heat directly in the tuyeres area and save extra coke to burn.
See lessPulverized coal is a solid fuel. It is applied through the tuyeres. It is used in coke savings but it decreases the basicity of flux.
Pulverized coal is a solid fuel. It is applied through the tuyeres. It is used in coke savings but it decreases the basicity of flux.
See less