السیرة النبوية از احمد بن زینی دحلان (م ۱۳۰۴ھ) کے مباحث فقہیہ کا تحقیقی جائزہ

Ahmad bin zeni Dahlan was born in Mecca on 1231 AH. He was a great scholar of Tafseer, Hadith, Fiqh and Sirah. His book "السیرۃالنبویۃ "is a wonderful piece of writing on sirah of Holy Prophet (PBUH). This book has got a significant place in sirah literature. In this book, Author discusses almost all the aspects of the life of Prophet Muhammad (PBUH), like his attributes, miracles, incidents and battles etc. One of zeni dahlan’s modes of sirah writing is that he derives juristic implications and lessons from the events of sirah which can be called Fiqh al sirah in modern terminology. This article intends to explore the mode of Fiqh al sirah in respect with “Al sirah al nabawiyyah” written by Ahmad bin Zeni Dahlan.

Design, Development and Performance Evaluation of Biomass Gasifier for Power Generation

The current study reveals various features that can affect the gasification process to improve syngas quality and yield. A comprehensive study was carried out using a 24 kW downdraft gasifier to evaluate the effect of uniformly distributed air in the oxidation zone, additional throat on the gasifier internal thermal profile distribution and the overall gasification process. The effect of biomass moisture, equivalence ratio, gasifying agent type and pre-treatment of the gasifying agent on producer gas yield and composition were also evaluated. The gasifier unit was equipped with cyclone separator, wet scrubber, water gas separator, biomass filter, auxiliary filter, cooling tower and vapour compression refrigeration system. The maximum flow rate of producer gas was found to be 90-104 m3h-1 under the biomass feeding range of 30-40 kgh-1. When corn cobs and waste wood (carpenter waste) with moisture content from 5-30% were used as feed stock, with 70ºC air as the oxidizing agent, the energy value of the producer gas obtained was 6.31 and 6.66 MJm-3, respectively. The heating value was improved to 6.72 and 8.43 MJm-3 when using 150ºC air-steam mixture as the gasifying agent, with the optimum equivalence ratio of 0.30. The Methane, Hydrogen and Carbon monoxide concentration (on volume basis) were found to be 6.20, 19.32 and 21.00%. The average amount of syngas produced from one kg of corn cobs and waste wood were 2.94 and 2.62 m3, while the average amount of tar produced was 2.2 and 1.8 gNm-3 respectively. The efficiency of cleaning and cooling system were found to be 86.81 and 92.06%. The experimental research concluded that uniformly distributed air in the combustion zone as an interconnected parameter with biomass moisture level, type of gasifying medium and pre-treatment/pre-heating of gasifying agent played a vital role in affecting the syn gas production and composition. Keywords: Gasification, Gasifier, Equivalence ratio, Gasifying agent, Pre-treatment, Syngas.