Fuel-air ratio required for combustion and analysis of gases in an intermittent kiln

Abstract

The air-fuel ratio necessary for coal combustion and the study of atmospheric emissions generated in an intermittent kiln of brickworks la Pradera were determined. A mass balance of the coal constituents and an isokinetic sampling of the gas emissions generated in the kiln were carried out. This was done according to the methodology and procedures established by “Ministerio de Ambiente, Vivienda y Desarrollo Territorial” in the protocol for the control and monitoring of atmospheric pollution generated by stationary sources. A combustion gas analyzer was used to measure the concentration of pollutants such as particulate matter, sulfur dioxide, nitrogen oxides, hydrochloric and hydrofluoric acids, and carbon dioxide and monoxide. The average concentrations of particle material, nitrogen oxides, sulfur dioxide, hydrochloric and hydrofluoric acids through the kiln chimney were 1228.60 mg/Nm3, 625.50 mg/Nm3, 563.10 mg/Nm3, 21.50 mg/Nm3 and 6.40 mg/Nm3 respectively, under reference conditions and adjusted to 18% oxygen. The kiln used has energy losses due to incomplete combustion of coal and sensible heat in the flue gases. The concentrations of nitrogen oxides, sulfur dioxides, and particulate matter are above the standard value and do not meet the permissible emission standard. On the other hand, halides do meet the respective standard.