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Faizābād, India

Sudhir K.,Yash Papers Ltd. | Vijay S.,Yash Papers Ltd. | Pankaj S.,Yash Papers Ltd. | Rai A.K.,Yash Papers Ltd.
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2012

Rice husk is one of the most important biomass fuel and renewable source of energy to generate power. It is burnt in ' Atmospheric Fluidized Bed Combustion (AFBC) water tube boiler furnace at 700-800°C. After combustion Rice Husk Ash (RHA) generated at this temperature gives rise to amorphous ash. The ash content of husk is about 20% and silica content (as silicon dioxide) in RHA is 92-93%. Rice husk ash is highly porous, light weight with very high external surface area and thus is very useful pozzolonic material. Rice husk ash type varies considerably according to burning techniques. The RHA used for this study for making mortar to replace partially or completely pozzolona Portland cement (PPC) is of amorphous ash collected after combustion temperature 700-800°c from boiler electrostatic precipitator (ESP) outlet. The different mix proportion of RHA, lime and PPC in the ratio of 50:40:10,55:35:10,60:30:10 and 65:25:10 respectively ground in ball mill for 8.0 hours and screened to 100 mesh sizes. After grinding from each mix which is termed as Yash Ashmoh mortar in the ratio ofYash Ashmoh: Sand was made to prepare standard cubes of 10cm x 10cm x 10cm dimensions and were allowed to dry and subsequently cured in water for 7 and 28 days. Yash Ashmoh with above mentioned mix proportions gave 97.5,122.5,140.0 and 155.0 kg/cm 2 average compressive strength after 7 days and 105.0, 130, 145.0 and 165.0 kg/cm 2 after 28 days curing. The maximum compressive strength was obtained with the mix proportion of 65:25:10. The compressive strength ofYash Ashmoh was compared with standard PPC mortar. The results revealed that Yash Ashmoh can be used in a big way for non structural purposes replacing up to 90% PPC. Yash Ashmoh binder is being used by the mill to produce flower pots, interlocking bricks, curved stones, drain trench covers etc. Further studies are in progress to develop the cement which can be used in concrete mix for high strength and making the concrete durable to chemical attack and water proofing compounds. RHA is truly called as carbon neutral green product. Source

Sanjay B.S.,Yash Papers Ltd. | Awaz K.M.,Yash Papers Ltd. | Sudhir K.,Yash Papers Ltd. | Narendra A.,Yash Papers Ltd.
IPPTA: Quarterly Journal of Indian Pulp and Paper Technical Association | Year: 2012

The prime purpose of Soda Recovery Boiler is to recover chemicals and heat from the black liquor, efficient generation of steam and electrical power from the fuel values of the black liquor. Recovery operation consists of concentrating the weak black liquor for firing in the Recovery Boiler & to produce white liquor which is returned to the Pulp Mill for cooking. Overall purpose is to have maximum caustic recovery with minimum wastages, minimum conversion cost & meeting all the environmental norms. The present study describes the recovery of caustic from black liquor generated out of Baggase/Wheat straw cooking and the challenges/problems associated with the use of Baggase/Wheat straw WBL as raw material for the Chemical recovery plant. Paper describes the counter measures were taken to efficiently run the recovery plant to meet the pulp mill requirement with minimum make up & conversion cost & unique practices being followed in the Recovery Operations to overcome these difficulties. The practical difficulties faced on account of high silica along with a host of non process elements (NPEs) & low GCV of Bagasse/Straw WBL. Major challenges in agro-based chemical recovery are overall recovery efficiency drop, low concentration of black liquor from evaporator, steam economy, steam generation, ESP breakdowns, high lime consumption in causticizing, scaling, deposition at heat transfer surfaces, high moisture inside the ESP, improper combustions etc. Source

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