Investigation of Ash Deposit Formation Dynamics in Boiler Units of Small Steam Capacity

The aim of the work is to study the dynamics of ash deposits formation process at sulfur fuel oil combustion in boiler units of small steam capacity, the influence of these deposits on technical and economic characteristics of boiler operation and analysis of ways to reduce emissions of harmful substances. The aim is achieved by experimental studies, in which the object was steam boilers DE-6,5/14GM, burning fuel oils of M100 and M40 grades. With the help of a bench installation installed in the gas outlet at the flue gas outlet from the convective part of the boiler, the intensity of ash deposits formation on its heating surfaces was determined. The results of measurements were evaluated for the content of gross error according to the Romanovsky criterion. The graphical dependences describing the percentage of heat transfer coefficient losses were obtained by the calculation method. According to the results of flue gas temperature measurements the heat losses in flue gases were determined. Comparative analysis of technical and economic indicators of power plants depending on the fuel quality showed that when using low-sulfur fuel oil, the average steam capacity of the boiler unit increases to 7-9 %, while the amount of harmful substances emitted with flue gases decreases.