Majari Magazine

have comment an method to reduce sulpur?

i just wanna give sugestion, how if you give us about coal fix bed combustion. please send that explain to my mail. thanks

This info is quiet educational. but my problem is how do I make the conversion of the Gross calorific value of the fuel from ar to DAF analysis. I understood how to get the DAF analysis for the components from AR analysis but how do I get the calorific value?

Will appreciate if u explain

Hi.
I want to understand the nature of Indonesian coal. Want to know about the coal characteristics like moisture content, ash, sulfur, etc.
Would appreciate any help in this regard.

Can any body send me a procedure to determine the Sulfur contents in coal ash by wet analysis.

Hi,
Can any body send me a procedure to determine the Coal Consumption when 4 different Coals of different GCV’s is being utilised.

I am looking at a coal analysis for Lignite. The heating values were reported as BTU /Lb include various conditions:
As received, Dry, DAF, and MMMFree. While I know the first TWO, I am not too sure about DAF and MMMFree. Could you explain these terms for me. Thank you.

reply for selly – Sulphur in coal cannot be reduced . But the sulphur dioxide formed during combustion caan be captured or reduced in Flue Gas desulphurising units or using limestone as a sorbent.
reply for Jim-
DAF means dry , ash free basis. The % is calculated based on 0 % moisture and 0 % Ash.
MMMF means Moisture and Mineral Matter free basis. Sometimes for high ash coals apart from ash there some mineral matter also is reported in the ultimate analysis. Mineral matter free basis is considering 0 % of ash and mineral matter.

reply to Haseeb :
Consider a large coal fired power plant has an efficiency of 33 % .
This means the plant heat rate is
3600/ 33% = 10909 kJ/kwhr (kiloJoules/Kilowatthour)
If the calorific value of Coal A is 20,000 kj/kg
then the coal required is = 10909 /20000 = 0.545 kg / kwhr.
If the calorific value of Coal B is 15,000 kj/kg
then the coal required is = 10909 /15000 = 0.727 kg / kwhr.
Of course ther will be a small change in th power plant efficiency because of the coal. But for quick calculations you can consider efficiency to be constant.

The website provides quite good information but basic. I will request for application of the coal characteristics particularly for coal ranking.

I’m looking for all 4 types of coal analysis.

1. lignite or brown coal
2. bituminous coal or black coal
3. anthracite
4. graphite

Sir,

I am looking for formula to derive ultimate analysis of Caol from proximate analysis & GCV of Coal.

Can you guide me so thatt we are able to get more precise efficiency of our plant.

A line of confirmation shall be highly appriciated.

for ST,
Following is a formula collected by me long time back. I dont remeber the reference.
Applicable for bituminous coal.
FC – Fixed Carbon % by weight on Moisture and Ash Free basis
VM- Volatile Matter % by Weight on Moisture and Ash Free Basis

Hydrogen % ( Moisture and Ash free basis )= VM *[ 7.35/(VM+10) - 0.013 ]
Nitrogen % ( Moisture and Ash free basis ) = 2.1 – 0.012 * VM)
Carbon % ( Moisture and Ash free basis) ={ [FC + 0.9*( VM-14)] – Sulphur %}
Sulphur % has to be assumed based on some prevoius analysis.

Convert all the above to Air dired basis or As recieved basis, as per the
Ash % and Moisture % in the proximate sample.
Then Subtract from 100 to get Oxygen %.

Another method is to use regression analysis form a large no of samples of both Ultimate and Proximate analysis to derive a quadratic equation. I did this long time back for Indian coals. Maybe in a few days time i can search and post it here thanks.

i have coal sample on recevied basis .i want to convert on dry basis please give me formula for ash moisture volatile matter fixed carbon & GCV

Hi
Can I get the average composition of coal (A’cite,L’nite,B’nus) to find the theoritical O2 required for combustion & Is there any thumb value for coal/MW Power.

Expecting your appreciable reply

hi
i want to know about the type of coal found in pakistan and how can we improve it?

did we convert coal into diamond or not?

hi,

I wish to know educational. how do I make the conversion of the Gross calorific value of the fuel from ar to DAF analysis. I understood how to get the DAF analysis for the components from AR analysis but how do I get the calorific value?

Secondly If anybody quoted on ADB basis of IM and GCV then I make convert in GAR Basis of GCV How I will calculate.

Please clear me.

http://majarimagazine.com/2008/06/understanding-coal-sample-analysis/

In above web site , typing mistake is observed . Under heading – Proximate analysis ,

wrong Statement :
The objective of coal ultimate analysis is to determine the amount of fixed carbon (FC), volatile matters (VM), moisture, and ash within the coal sample

Correct Statement:
The objective of coal Proximate analysis is to determine the amount of fixed carbon (FC), volatile matters (VM), moisture, and ash within the coal sample

i would like to do a university project on basic coal analysis however i got no clue what to as a project,actually what to test for project purpose not like day to day analysis.

I need to know on how many basis does coal is classified and what are they and i also want the classification.
What are the tests required basically in proximate and ultimate analysis(list of the tests) and are float and Sink, hard groove grindability Index included in ultimate analyses.Thanks!

Sir, one more thing want to know
1) formula to determine total sulphur on as received basis, when pyretic sulphur, sulphate sulphur and organic sulphur is given.or do total sulphur has any relation to these sulphures during calculations
Thanks,for your time!

may i know the answers of my previous questions.

its my first time to visit your site. please send me the procedure on determining ultimate analysis using AAS

would you please give me the procedure on ultimate analysis using AAS

hi, thank alot about this info.
can you described how the method coal analysis?

Sir,

Beside above tests, there are some physical tests carried out for coal, such as Hard Grove Grindability Index and Abrasion Index

What are the requirements for these tests for a coal fired power plant with a CFB boiler

Thanks

thanks for above comments it helped me lot……………

i want to understand the chemical analysis of
Pakistan coal located at Lakhra

I am attending one coal fire . Before fire coal ash was 24%. After fire extinguished by water,
samples were drawn and tested.Found that TM 5%, ash 38%. My understanding is that even if partly burnt coal is fully burnt in laboratory coal ash should remain same as 24%.
why there is increase ?

Please reply

Tambe

Any Questions related to Coal Analysis are welcome on my email ID

Is there such a thing as an abrasion index and/or hardness index for coal ?. If so could you advise test methods.

Thanks.

what is full form of GAR.
How do you calculate GAr value if we know the GCv on ADb basis .
We know total moisture and Im on ADB. what formulae do we adopt to calculate GAR. what is NAR.
appreciate your reply

sir,

Please clarify the formula which has been used for ADB(air dry basis) to ARB (as received basis).Please mail me the clarification.

Thanks & Regards,

Vignesh kannan

I would like to know the phosphorus % in Indonesian thermal coals from Kalimantan area.
Thanks

what are the types of coal analysis?

Hi! I was surfing and found your blog post… nice! I love your blog. Cheers! Sandra. R.

Please email the calculation formula to convert GCV from ADB to ARB. Thanks in advance

Greetings,

I was wondering if anyone could tell me the formula to convert Moisture from ADB into AR. any help is greatly appreciated. Thanks much

Can i get complete (detailed ) procedure of Elemental Analysis of coal ( As done in Indian or in any other Lab.)? please mail me the details.

Dear Sir / Madam

We are determining Gross Calorific Value (GCV) of Raw coal by Bomb Calorimeter using Air Dried sample.
For example, Analysis details are as under :
Total Moisture : 11%
Inherent Moisture 3%
Ash (including IM) 25%
GCV 5500 K.Cal/Kg

Please provide the GCV of above on As Received (AR) basis

How can I calculate gar vaue if adb/arb value is known? Can you provide me the formula?

peat is also a form of coal

PLEASE NOTE THAT THERE IS A FORMULA FOR LOW RANKING COAL.
GCV=2111+0.6812UHV

INHERENT MOISTURE AFFECTS COAL GCV

sir,
i found it very helpful to improve my concept .
I want to derive such a formula to determine the GCV of pak coal because available formulas are not valid for our coal
if u send me helping materials,so that i can derive such a formula,it may improve a big achievement in our field.
bet regards;
NAVEED AHMAD COAL TECH PU

hi.
saman ang kami i am student of centre for coal technology university of the punjab lahore (pakistan).r u student of our centre ? if not then why and from how long time u work on coal.my mail is
junaid_asgharian@yahoo.com

to convert ‘adb’ to’ arb’ use this formula :

GCV (arb) = GCV (adb) X (100-TM)/(100-IM)
Hence, the bigger the difference between TM adn IM will result in bigger difference in GAR between ‘abd’ and ‘arb’ value.

GAR = GCV (arb)
NAR = Net CV (arb)

Rule of thumb (safely minus 250 from GAR to get NAR. This is only estimate.

hi i am a member of CHQ group we work on coal
centre for coal technology university of the punjab lahore(pakistan)
junaidasgharian@yahoo.com

Pls clarify the relationship between fixed carbon and coke contents of coal.

Excellent article really helpful. I found the formulas in

http://www.worldcoal.org/bin/pdf/original_pdf_file/coalconversionfacts2007(04_06_2009).pdf

Someone should build a calculator application for this. I did an excel one

Dearsir,
I want to know about different methods to calculate the gcv of thecoal while analysis.what percentage of sulphur is perferrable for coal in steel industry.How can we find the varition of fuel ratio for dfferent types of coal.

How can define Free Moisture in coal.what a procedue ?

Dear sir,

Please provide me the Formulae for Calculations

Hi,

Please send me if you have any coal related trainings and seminars. Thanks,

We’re in coal sourcing for our 235 MW capacity, who can provide me coal type matrix with adb and arb analysis. We prefer high and mid CV with low sulfur. Thanks.

can any body explain to me how to calculate GAR, NAR from ADB

Can i get complete (detailed ) all type of coal ( As done in Indian or in any other Lab.)? please mail me the details

Sir,

Good Afternoon!! i just want to know what is more accurate analysis. is it the ash received or the air dried? email me at johnlouie_sy@yahoo.com
Thank You very much!!!!!!!

thanks for sharing the info, but what is the meaning of as-fired basis , is it the same with as recieved basis

Sir, please tell me formula of gcv and differences between four types of coal

dear sir;

now i neeed one easy and portable methord to inspect the steam/blending coal on the locale, mainly in some index: total moisture, inherent moisture, ash, gulfur, hard grove index and net calorific value….. who can help and lead me? tks!

pls revert to my e-mail:caesarxu@jiangsu-sunny.com.

tks for yr comment and helps!

caesar xu

coal preparation ,and determination of proximate analysis latest process send my email id

To reduce the sulphur, we have to use lime stone while coal combustion, and the alternate process is to have a desulpharisation plant.

What is the difference (if any) between GAR and NAR?

Does anybody know a list of vendors for coal analysis?

Regards.

i want to know how i can find partical size in coal and what r the different sizes of mash used for this analysis

Dear Sir,

Can any one help me to know what GCV impacts on coal/fuel costing & how it is calculated on in terms of price

where do I find a , how to read , coal analsis , done at a coal prep.plant , before and after washing .
thank you ed

Hi Gustav,

Depending on your location, I might be able to help you out with some compaines that provide coal analysis services. Please contact me at terrorjay81@live.com.au

plz describe the arb method

i use coal standards for proximate analysis but when i use it for gcv analysis, i don’t get the true value of my standard. Does anyone knows the why? what should i do?

i use coal standards for proximate analysis but when i use it for gcv analysis, i don’t get the true value of my standard. Does anyone knows why? what should i do?

Pls what is the diffence between proximate and ultimate analysis. Thanks

why ash content is included in ultimate analysis?

how can i caluculate the GCV from ultimate analysis of coal

what is the density of indian coal

Free information, advice and ocuments on Coal and Energy are available.
Please contact kazmi at kensys dot pk

pls mail me witi anticle on coal uses.thanks.

Dear sir, please why Calorific value is included in Proximate analysis

I completed my BSc Mechanical Engineering Fainal Year Project on given topic and it got 2nd position in OPEN HOUSE, UET Taxila

“Proposed Simulations, Mass and Energy Balance of Thar Coal Project, PIEAS, Islamabad”
• Integrated Gasification Combine Cycle Power Plant
• Fischer Tropsch Liquid Plant
Study of IGCC, Fisher Tropsch Plant, mass and energy balance of each component manually as well as using ASPEN Plus and simulations of whole plant on MS Excel and Aspen Plus. I also include comparison of Gasifire technology with under ground gasification and give some technical suggestions.
Interested people may contact at abdul.wasy@ymail.com

i will like to ask for in formations about coal analysis, university project topic.

what is coal methodology all about and what r the processes involved.

what r the test method to the analysis of coal

what r the instruments used in coal analysis and what r the procedures.

Hello, your site very helpful. Can you advise where I can find a source which enables me to calculate the amount of coal required to fire a 20 HP [draw bar pull] locomotive at 20mph [approximately]. I am a member of the North Dorset Railway Trust and they are building an old British rail engine for which I do not have records. So I am having to start from basic principles. Many thanks J.Mason

I manage a brick factory in western cape REPUBLIC OF SOUTH AFRICA WE FIRE THE TUNNEL KILN WITH COAL every now and then the ash on the brick would be brown instead of white based on my experience it have to be metal present when they sen the coal to a lab the result only show 2.3% FE2O3 what specefic test could i ask for to prove my point

what is the ADB and ARB ? then how can we calculate the GCV (ADB) to as received basis?

pl tell about blending calculation as how to make and idea behind

I welcome to thank you for a wonderful daylight together.

hello

Thank you for this informative article. I have a question though, I want to know why it is necessary to do an ultimate and proximate analysis of coal when calculating the efficiency of a coal fired boiler?

dear sir,

i want to know to calculate the nett cv of coal from gross cv theoretically using moisture, without using the ultimate analysis and which should be more appropriate/accurate.

What will be the fornula to calculate FC in to GCV if test/analysis conducted on AD basis.

For example : We are getting report on ADB and the FC is shown as 46.5 % ,what will be GCV ? Please guide us the conversion or formula.

Hi

i want to know how to draft price adjustment clause when there is variance in moisture contents without consideration of penalty clause. eg GCV ADB 5800 WITH TM 40 has given by supplier against contract required 5800 with TM 28 AT PRICE OF USD58 . IN this case how to reduce the price , pl furnish with explanation- tks

for coal converters, blending calculators, slagging, fouling calculators, visit http://www.coalspot.com.

Use it and send your feedback.

dear sir,
could you please mail me the detailed procedure for analysis of moisture in hard coke

sir,
I want to know about the standard laboratory procedure of coal analysis(protocols),that can be followed by thermal power plant in India. please send me in my e-mail.

How to convert coal from one moisture content to another also from one ash content to another. The intention is to understand the change in GCV with variation in moisture and ash content.
Thanks

Hello i am in the process of closing a deal between a supplier and a buyer and i would like to consult anyone for a second opinion on coal analysis and trade protocols , so i can insure myself that all the info i have from both parties are correct to avoid any last minute disagreement , im not sure if i can live my contact info in this message but i will try , i can also contact any of you who can help , by email or phone , feel free to give me your info as well so i can contact you myself to avoid any communication fees…
Alex Caza most_wantedmtl@hotmail.com cell 0015149529268

Thank you all and Happy New Year!

An excellent explaination for coal Analysis ,author has covered every thing possible for any
student looking for general information on coal. Even the details provided are beyond the scope of topic. yet very well covered. I congratulate the author for a very thought provoking definations.

You have mentioned that the volatile material consists of some long and short hydrocarbons and aromatic hydrocarbons and sulphur. Could you please all of them exists, normally, in the volatile material and the procedure to calculate, empirically though?

Excellent Website!!
I am looking for excel spread sheets for coal analysis
or for someone who can help me create one.