STACK DESIGN FOR LIME KILN

Abstract

Lime kiln emitting smoke, which contains 302,N0x, CO, particulate and low temperature distillates if fired by steam coal are main factors causing pollution. In our laboratories, planned studies are being carried out for monitoring and control of pollutants emitted by lime furnaces with particular reference to those being oper ated in Doon-Velley. In the present work two primary pollutants 502 and fine dust or separable particulate matter have been chosen for design of stack to be used for lime kilns. A primary factor in determining whether or not industrial wastes emitted to the atmosphere will be a nuisance is the stack design. Generally speaking, the higher the stack and the greater the exit velocity the better. But improvement at the ground does not vary pro-portionally with increasing values of these, and economic and other factors limit stack heights and exit velocities. There are thus optimum design values which vary with climatic conditions, topography, composition, temperature and exit velocity of effluents, and so on. A computer program is developed in Fortran-IV for the design of stack, diameter of stack and exit velocity by taking meteorological concepts (wind velocity and directions) and location into account. Ground concentr-ations of effluents are estimated with various possible heights and exit gas velocities.