Lower kiln rpm gives good preheating temperatures and higher kiln rpm gives longer campaign life. The optimum rpm for tpd kiln is 0. Temperature of the cooler discharge product: The temperature of the cooler discharge product is maintained well below deg C. This temperature is significant in preventing thr reoxidation of the product during storage.
In case of cooler discharge temperature of more than deg C product shall be diverted separately and cooled in covered shed in open air by spreading layers of not more than mm thick. Coal is injected in such a way that fresh coal falls at various zones of the kiln so as to maintain the temperature profile.
This system ensures consistency in the product quality. The mean particle size of iron ore shall be restricted to 11mm in order to achieve uniform Fe metallic of all grain size fraction of the product. The mean particle size ratio of iron ore to feed coal shall be in the range of 1. Retention Time: The time traveled by the materials in the kiln is taken as a reference for the assessment og the kiln condition. In case of a fresh kiln the retention time for a TPD kiln at 0.
With the formation of coating the retention time increases progressively. The retention time can be easily determined by feeding 30mm size hexagonal nuts in feed conveyor and collecting the same at cooler discharge conveyor.
Any abnormal increase in retention time clearly indicates severe accretion formation hindering the smooth flow of materials. Fe total: The Fe total content in sponge iron purely depends on Fe con tent in iron ore and the degree of reduction achieved in the process.
Carbon content: The carbon content in sponge iron produced by coal based rotay kiln processes are generally low and is in the range og 0. The carbon content in gas based processes can be controllrd to a level of 1. Size Distribution: The size distribution of sponge iron lumps varies with decrepitating behavior of iron ores.
As the Fe metallic content in sponge iron varies for each size fraction control of feed size of iron ore is very important for achieving uniform Fe metallic content. The typical size distribution and Fe metallic for each fraction is as given below. Material Balance and Energy Balance: The typical material balance and energy balance for tpd kiln is as given below. In order to have effective control and monitoring of process parameters, Direct reduction plant comprising rotary kiln, rotary cooler, waste gas cleaning system, product separation system, in plant dedusting system, PLC system, Measuring and control systems shall be equipped with standard equipments.
All records of the process parameters shall be maintained properly to serve as a reference for analysis and for future requirements. IS Iron ore lumps for direct reduction process. IS : Various tests on raw materials to be used for coal based rotary kiln direct reduction. IS Guidelines for ash softening studies on solid reductants for direct reduction. IS Guidelines for non-coking coals for solid reductant base direct reduction in rotary kilns.
IS Method for determination of coal char reactivity for direct reduction process. Unknown September 20, at AM. Unknown September 28, at AM. Unknown October 13, at AM. Unknown October 15, at AM. Unknown November 26, at AM. Unknown February 28, at PM. Unknown September 29, at PM.
Unknown January 12, at AM. Unknown August 7, at AM. Rainman June 29, at AM. Unknown May 10, at AM. Venkat July 2, at AM. Unknown February 5, at AM. Anonymous April 15, at AM. Unknown August 2, at PM. Unknown January 21, at PM. Unknown January 24, at AM. Anonymous June 6, at PM. Anonymous July 2, at AM. Rakesh April 10, at PM. Surelia Dev April 15, at AM. Miguel Calabozo Alvaro. Aan Supriyanto.
Fadhil Khalid. Sara Vijay. Said EL Fakkoussi. Prasanna kumar subudhi. Albar Budiman. Kenny Ruiz. Bijay Agrawal. More From hijzain. Fundamentals of Modern Manufacturing Mikell P.
Muhammad Faisal Khan. Julna Seethi. Reduction and sintering of Ouxed iron ore pellets-a comprehensive review. Popular in Materials. Saravanan Kumar. Carmelo Magno. Nikola Radovic. Syed Raziuddin. Nupur Bhadra. Zia Khan. Ivan Morales Aguilar. Saravana Kumar.. Malik Kirby. Mauricio Esteban Fernandez Ramirez. Tawfiq Zidan. Tamara Knox. Ralph Daniello. Raymond Godfrey Dagwasi. Prudhvi Raj. Vietanh Phung. Mcael Timanta Ginting. Varthini Raja.
Juan Van der Tapia. Johan Castro. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime. Next SlideShares. You are reading a preview.
Create your free account to continue reading. Sign Up. Upcoming SlideShare. Sponge Iron Industry. Embed Size px. Start on. Show related SlideShares at end. WordPress Shortcode. Share Email. Top clipped slide. Download Now Download Download to read offline. Sponge iron making process Nov.
0コメント