Improving the efficiency of heat supply systems for infrastructure facilities by optimizing the pipeline subsystem according to technical and economic indicators

Abstract

The fuel economy, which provides acceptance, storage, preparation and supply of the necessary amount of fuel oil for its combustion in boiler furnaces, is one of the energy-intensive technological subsystems of thermal power plants and boiler houses. The design of new technological pipelines and the modernization of existing pipeline systems for transporting fuel oil involves hydraulic calculations. Generally accepted in practice is the hydraulic calculation of pipeline lines based on the flow continuity equation and the Bernoulli equation for a real viscous liquid, which takes into account the pressure loss due to friction and to overcome local pipeline resistances. With this approach, hydraulic calculation is a multi-variant task, since there are an infinite number of combinations of parameters pipeline diameter - pressure drop, which are not equal from both economic and technical points of view. Research of literature sources has shown the feasibility of conducting hydraulic calculation of pipe-wire lines on technical and economic indicators. As a criterion for optimization of technological pipelines, the total annual costs for the creation and operation of the pipeline, which are a linear superposition of capital and operational costs, are proposed. The paper offers calculation relations for determining the optimal diameter of the pipeline from the condition of minimum total annual costs for its creation and operation, taking into account current prices and tariffs for the pipeline and electricity, pipeline tracing, conditions of its operation, as well as the properties of the transported medium. On the example of a hydraulic installation for pumping fuel oil, computational experiments were performed to assess the influence of the pipeline diameter on its technical and economic indicators and determine the optimal parameters of the fuel oil pipeline.