Heat Resistant Lining

Hello tcchandran

You don't list your Location or Country, which is best done in your "Profile", then it auto-updates through all your Posts.

Please advise which "solid fuel" you are using:

1. Coal - Advise size and type
2. Wood - advise species
3. Corn Pellets
4. Wood Pellets - advise wood species
5. Coke
6. Other, please advise
   

You say the <"....Temperature inside furnace may be around 500-600C....">

• Have you actually measured this temperature, or is it a guess?

It may well be that the fuel you are using, gives off corrosive gases, which erode the firebricks you have used.

• Advise length of the tube, and if it has any bends or elbows in it.
• Advise inside diameter of tube (when the firebricks are in place)
• Do you have air blown into the burner or furnace, or is the air supply natural draught?
• Advise make and model of firebricks.
• Have you contacted the firebrick maker/
• Have you contacted the "fireproof grout between the firebricks" maker?
  
• Any further information which may have a bearing on your problem.
  

All the above variables need to be known, to give you a proper answer.

Reply here, with

Kind Regards....

Sparky,

I agree 100%. I would also ask what is the velocity of the hot gases passing over the bricks.

If "modern" methods are what is desired and if your questions are answered completely this may be an application for ceramic fiber modules with 1/4" fiber paper as a first covering of the surface prior to module installation. What is the minimum and maximum cold face temp. that is acceptable?

Mike

Thank you very much for your response.

The velocity of hot gases passing through the bricks is 2 meter cube per second at a water gauge pressure of 150mm.The HP of the ID fan is 7.5 and rpm is 1500.

Can you please explain to me what min and max cold face temperatures are?

Thanks

TC

Sparks,

Did you ever get answers to your great questions? I think I missed a response by the thread originator.

Mike

The details you wanted to solve my problem are given below:

1.The fuel used is cashewnut shell after extracting oil from it.

2. The temperaure inside the furnace is a guess and it was not actually measured.

3.The length of the tube is 1.5 meters

4.The inside diameter is 1 meter. The inside of the tube is not lined with firebricks but with refractory cement capable of withdstanding high temperature about 1500 C.

5. Refractory cement is from ACC, India

6.I have not contacted the firebrick maker nor the grout maker.

7. The furnace has refractory bricks and it is connected to the boiler through the MS tube which has refractory coating inside.The fuel is fed into the furnace.

8. The boiler connected to the surface has a capacity of 2 Tons/hr @a working pressure of 150 psi.

I hope with this information you will be able to help me.Thank you for your prompt reply.I was waiting to get more information for you, hence the delay to reply.

Thanks and kind regards

TC

HI TC,

I HAVE ALREADY MENTIONED ABOUT HIGH ALUMINA CERAMIC TILES LININING INSIDE THE TUBE. I'M SURE THIS WILL SOLVE YOUR PROBLEM. IFTHE VIBRATION LEVEL WILL BE MORE ON THE TUBE, THE TILES CAN BE FIXED WITH DOVE TAIL (OR) WELDABLE TILES.

I HAVE ONE MORE SOLUTION FOR THIS APPLICATION/PROBLEM.

- YOU CAN FABRICATE THE TUBE WITH PRE WELDED WEAR PLATES HAVING BORIDE AND CARBIDES OF NIOBIUM,TUNGSTON AND CHROMIUM TO TAKE CARE OF THE SEVERE WORKING WEAR FACTORS LIKE TEMPERATURE, CORROSION AND HIGH VELOCITY FINE PARTCLES FROM THE FURNACE.

SINCE THE PREVAILING REFRACTORY COATING PROVIDED INSIDE THE TUBE IS CAPABLE OF WITHSTANDING TEMP AROUND 1500DEG BUT COULDN'T STICK TO THE TUBE LONGER DUE TO THE HIGH VELOCITY EROSION OF THE FINE PARTICLE FROM THE FURNACE, IT DOESNT PERFORM.

MAHISRIRAM

Hi Mahisriram,

Excellent! Thank you very much for your input. I will try your suggestions and report results.

Regards

TC

Thank you very much for your prompt response. I had replied to the questions you had asked.What is your comment? If you need any further information to suggest a sloution please let me know.

Thanks

TC

Mr chandran,

Can u provided the following detail to me so that i can solve ur problem .

1. dia of the Mild steel tube .

regards

Earnest.

The diameter of the MS tube is 1 meter.

Thank you

Regards

TC

Back in the 80's I experimented with a ceramic material designed for repairing cracked chambers in boilers. For the intended application, you opened a sealed plastic bag in which the ceramic was saturated with a slightly viscous substance. You cut it to shape with scissors and secured it to the inside walls of the furnace. To cure the installation, you merely fired up the furnace.

I never used it in that manner. I purchased it for the purpose of wrapping the stainless steel exhaust manifolds on aircraft engines so as to reduce the amount of heat generated under the cowling, especially in turbocharged engines.

Worked like a charm but it was rather brittle when cured. I had to redo the installation and wrap the ceramic blanket with wire.

Dear Mr. Chandran,

I was investigating solution for a similar problem just a while ago. The solution could lie in coating the refractory with ZIRCOAT M which is claim to resist heat and severe attack of gases and fumes at low and high (1500 deg C) temperatures with considerable resistance to corrosion and erosion. Refer www.adorfon.com for further particulars.

Best of luck!

Based on my experience, the best suited solution for your problem/application is to go for high alumina ceramic lined pipe to prolong the life of the pipe or to combat the severe working conditions like temp/high velosity of the particles/erosion

u need not do much R&T on this due to the fact that this kind of application is regularly being solved through ceramic tile lined pipes. If the inner dia of the pipe is less than 120mm the ceramic lined pipe pipe can be procured with slip casted lining.

pl find below the material Vs relative wearlife comparison for your reference.

•Poly Urethane 0.2 •Mild Steel 1.0 •Stainless Steel 1.1 •Abrasion Resist Steel 2.1 •Cast Basalt 2.7 •Chrome Alloys 2.9 •High Chrome Ni-hard 4.5 •Silicon Carbide 8.5 •Alumna Ceramics 8.5

mahisriram

Your problem is the oxidation of the ID of the tube. The expansion of the oxide behind the refractory is most of the problem causing the failure of the system. We have coated several cement kilns and boiler super-heaters using special oxidation resistant composite coatings with good results. You also need to be aware of the thermal expansion issues relative to the tube chemistry.