Distributions of Cr, Ni, Cu and Zn in Hazardous Waste Co-Processing in a Pilot-Scale Rotary Cement Kiln

2011 ◽  
Vol 12 (1) ◽  
pp. 22-31 ◽  
Author(s):  
Jenwit Krobthong ◽  
Manaskorn Rachakornk ◽  
Viboon Sricharoen
Keyword(s):  
Hazardous Waste ◽  
Pilot Scale ◽  
Cement Kiln ◽  
Rotary Cement Kiln ◽  
Cu And Zn

Disposal of hazardous industrial waste in cement kiln – A pilot study of acid tar sludge

2021 ◽  
pp. 0734242X2110555
Author(s):  
Rahul Baidya ◽  
Sadhan Kumar Ghosh
Keyword(s):  
Hazardous Waste ◽  
Feed Rate ◽  
Treatment Plant ◽  
Ambient Air ◽  
Cement Kiln ◽  
Cement Plant ◽  
Hazardous Waste Disposal ◽  
Alternative Means ◽  
Central Pollution Control Board ◽  
Disposal Problem

Acid tar sludge (ATS) is a hazardous waste generated in steel plants as a process by-product. ATS disposal is a major challenge for the steel industry around the world and specifically for developing nations. Hazardous wastes are usually disposed of in a dedicated expensive thermal treatment plant as per existing rules. Due to inadequate capacity of treating the total amount of hazardous waste, study of other economical options are required. India generates over 7.2 million metric tonnes of hazardous waste annually as per Central Pollution Control Board (CPCB), Government of India. Thus, co-processing of ATS in cement plant as an alternative means of disposal was studied based on a number of trials. During the five trials of 5 day each, feed rate of ATS was maintained at 0.4 tonne per hour (TPH) with an average coal feed rate of 10 TPH. No incremental variations in emissions were observed during the trials. The analysis further revealed insignificant impact on clinker quality, leach behaviour and cement property. The study also showed negligible impact on ambient air quality based on NO x, SO2, RSPM, SPM measurement at varying location around the cement plant. Thus, co-processing of hazardous waste such as ATS in cement plant can be an effective way to address the hazardous waste disposal problem in developing countries such as India.

Rotary Cement Kiln Simulator (RoCKS): Integrated modeling of pre-heater, calciner, kiln and clinker cooler

2007 ◽  
Vol 62 (9) ◽  
pp. 2590-2607 ◽  
Author(s):  
Kaustubh S. Mujumdar ◽  
K.V. Ganesh ◽  
Sarita B. Kulkarni ◽  
Vivek V. Ranade
Keyword(s):  
Integrated Modeling ◽  
Cement Kiln ◽  
Rotary Cement Kiln

Clarifying the decomposition process of pyrite and SO2 release in the cyclone preheater of a dry rotary cement kiln system

2019 ◽  
Vol 241 ◽  
pp. 118422 ◽  
Author(s):  
Tongsheng Zhang ◽  
Chang Wu ◽  
Bin Li ◽  
Chao Wang ◽  
Xinzhi Chen ◽  
...  
Keyword(s):  
Decomposition Process ◽  
Cement Kiln ◽  
Rotary Cement Kiln

Heat and Material Balances for a Rotary Cement Kiln

1935 ◽  
Vol 27 (4) ◽  
pp. 379-382 ◽  
Author(s):  
William N. Lacey ◽  
Hubert Woods
Keyword(s):  
Cement Kiln ◽  
Rotary Cement Kiln

Thermal analysis of spurrite from a rotary cement kiln

1989 ◽  
Vol 35 (4) ◽  
pp. 1129-1136 ◽  
Author(s):  
G. Goswami ◽  
B. P. Padhy ◽  
J. D. Panda
Keyword(s):  
Thermal Analysis ◽  
Cement Kiln ◽  
Rotary Cement Kiln

Hybrid Eulerian Multiphase-Dense Discrete Phase Model Approach for Numerical Simulation of Dense Particle-Laden Turbulent Flows Within Vertical Multi-Stage Cyclone Heat Exchanger

2018 ◽  
Author(s):  
Eugen-Dan Cristea ◽  
Pierangelo Conti
Keyword(s):  
Heat Exchanger ◽  
Carrier Phase ◽  
Phase Model ◽  
Cement Kiln ◽  
Dispersed Phase ◽  
Discrete Phase Model ◽  
Dry Process ◽  
Rotary Cement Kiln ◽  
Multi Stage ◽  
Discrete Phase

This article describes a CFD engineering application developed to investigate numerically the multiphase, non-isothermal, turbulent flow physics within the suspension preheater of a dry-process rotary cement kiln. The multi–stage cyclone preheater is a counter-current heat exchanger. We used the CFD flow solver ANSYS-Fluent R18.1. to accomplish this task. The hybrid Eulerian multiphase-dense discrete phase model is a coupled Eulerian-Lagrangian technique. The primary carrier-phase is treated as a continuum by solving the Navier-Stokes equations, while the secondary discrete dispersed-phase is solved by tracking the particle parcels through the calculated flow field. The multiphase turbulence of the carrier-phase is modeled using the Reynolds stress transport model. The dispersed-phase interactions are modeled through the specific collisions models provided by the kinetic theory of granular flow and/or discrete element method. The Eulerian multiphase-DDPM method provided a quiet stable solution for a medium/high mass loading (solid to gas mass ratio 0.89:1). The four-stage cyclone suspension preheater is analyzed for its operating performance i.e. overall pressure drop and global collection efficiency of cyclone stages, calcination degree at bottom cyclone stage, flue gas temperature at 1st. cyclone stage and availability to get more insight of very complex multi-phase flow patterns within this equipment. The set of industrial measurements, collected during a heat and mass balance of a dry process rotary cement kiln, were used to verify and to validate part of the simulation results.

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