Serbia - public sector accounting review : report on the enhancement of public sector financial reporting

The government’s public financial management (PFM) Reform Program 2016-2020 foresees the gradual transition of public sector financial reporting from a cash basis to an accrual basis of accounting and the application of International Public Sector Accounting Standards (IPSAS). This will significantly improve the quality of financial information and should enable better informed decision-making, more efficient use of public funds and resources and improved fiscal performance. This Report on the Enhancement of Public Sector Financial Reporting is one output of the Serbia Public Sector Accounting Reform Technical Assistance project funded by the Swiss State Secretariat for Economic Affairs (SECO) through the Strengthening Accountability and Fiduciary Environment (SAFE) Trust Fund under the Public Sector Accounting and Reporting Program (PULSAR) which provides support for the development and implementation of public sector accounting standards. This report supports the development of a plan towards that goal by assessing the institutional framework for public sector accounting as well as the gap between Serbian public sector generally accepted accounting principles (PS GAAP) and IPSAS

Modeling and optimization of processes for clean and efficient pulverized coal combustion in utility boilers

Pulverized coal-fired power plants should provide higher efficiency of energy conversion, flexibility in terms of boiler loads and fuel characteristics and emission reduction of pollutants like nitrogen oxides. Modification of combustion process is a cost-effective technology for NOx control. For optimization of complex processes, such as turbulent reactive flow in coal-fired furnaces, mathematical modeling is regularly used The NOx emission reduction by combustion modifications in the 350 MWe Kostolac B boiler furnace, tangentially fired by pulverized Serbian lignite, is investigated in the paper. Numerical experiments were done by an in-house developed 3-D differential comprehensive combustion code, with fuel- and thermal-NO formation/destruction reactions model. The code was developed to be easily used by engineering staff for process analysis in boiler units. A broad range of operating conditions was examined, such as fuel and preheated air distribution over the burners and tiers, operation mode of the burners, grinding fineness and quality of coal, boiler loads, cold air ingress, recirculation of flue gases, water-walls ash deposition and combined effect of different parameters. The predictions show that the NOx emission reduction of up to 30% can be achieved by a proper combustion organization in the case-study furnace, with the flame position control. Impact of combustion modifications on the boiler operation was evaluated by the boiler thermal calculations suggesting that the facility was to be controlled within narrow limits of operation parameters. Such a complex approach to pollutants control enables evaluating alternative solutions to achieve efficient and low emission operation of utility boiler units