Engineering method for calculating the parameters of flue gas parameters of coal-fired thermal power plants based on solid fuel characteristics

Abstract

Introduction. The increase in coal share in the fuel balance of thermal power plants has led to increasing the SO 2 annual gross emissions to about 1 million tons. This fact require to introduce technological measures for the reduction of SO 2 emission at coalfired thermal power plants. Materials and Methods. Using a standard procedure, we have performed calculations of the specific flue gases volumes and SO 2 concentrations in them by the data of 96 certificates for coal products from mines and concentrating plants of the Donetsk coal basin. Results and Discussion. As a result, we have obtained empirical linear dependences of the specific volume of dry flue gases on lower heating value and ash content in the fuel and dependences of SO 2 concentration on sulfur and ash content in the fuel, which are different for low-reactive and high-reactive coals. In the case of presence of unburned carbon, the specific volume of dry flue gases decreases by a factor of (1-q u /100), and SO 2 concentration in them increases in the same proportion. We have created an engineering method for determining the specific volume of dry flue gases of coal-fired boilers and expected SO 2 concentration in them based on the data of coal technical analysis in the presence of the heat loss due to unburnt carbon. The method of the specific emissions' calculation at the TPPs and CHPs and the sulphur dioxide concentration expected in it is proposed to use in a range of the fuel ash content A d from 4.0 to 50.0% and the fuel low heat value Q i r from 14.5 to 32.0 MJ/kg. The proposed engineering method has been used for calculating an estimate of the gross SO 2 emissions and volumes of dry flue gases at the Ukrainian coal-fired thermal power plants from 2012 to 2016. The values of sulfur specific emission in flue gases during recent years are at a level of 16-20 grams per kilowatt-hour (kW-h) of electricity supplied. Conclusions. The method developed allows to make the evaluation of the sulphur dioxide emission expected on the basis of the technical analysis data and choose necessary desulphurization technology to meet the environment legislation requirements.

Estimation Method of Greenhouse Gases Emissions at Thermal Power Plants

“…According to our calculations, the oxidation degree of fuel carbon ε С with an accuracy of 0.6% can be determined by the formula [3]:…”

Selection of the Technology of Desulfurization of Flue Gases for Ukrainian Coal-Burning Thermal Power Plants

“…Існуючий парк газоочисного устаткування на ТЕС України представлений лише пиловловлювачамисухими електрофільтрами та мокрими золовловлювачами, які вводилися в експлуатацію одночасно з основним устаткуванням енергоблоків. Їхні проектні показники ефективності відповідають екологічним вимогам 40-60-річної давності, а тривалий час експлуатації призвів до значного падіння ефективності, вони і фізично, і морально застаріли [8][9][10][11]. На жодній ТЕС не споруджено установки очищення димових газів від діоксиду сірки.…”