Analysis of the Heat Exchanger Energy Efficiency of Variable Cross Section with an Inhomogeneous Coolant

Abstract

One of the main priorities in the modern thermal power engineering development is the problem of energy saving due to the economical use of fuel and energy reserves. Increasing energy consumption with a simultaneous increase in energy prices and widespread environmental degradation necessitates the development and implementation of energy efficient technologies to save fuel, materials and labour costs. The object of study is tubular heat exchangers of variable cross section, which are widely used in steam generators of nuclear power plants, gas turbines and transport plants. Scale deposit properties and the composition of the heat coolant were studied, and their influence on the energy efficiency of heat exchangers was analysed. To study the scale deposits and coolant influence on the energy efficiency of heat exchangers, their properties were examined using an atomic emission analysis with the help of a TESCAN electron microscope. The principles of implementing technologies aimed at intensifying heat transfer, reducing hydraulic and heat losses in heat exchangers were formulated.

Improving the Quality of Ekibastuz Coal Using the Dry Enrichment Method

“…Global climate change, caused by increasing harmful emissions into the atmosphere, necessitates a widespread transition from hydrogen energy to the development of technologies for converting renewable energy sources (RES). According to the Sixth Assessment Report of the International Panel on Climate Change (IPCC), anthropogenic greenhouse gas (GHG) emissions have reached the highest levels in human history, which is already having a negative impact on the Earth's climate [1][2][3][4][5][6][7]. In the production of electricity and heat, coal generation retains a dominant position.…”

“…The priority in the modern thermal power engineering development is the problem of energy saving due to the economical use of fuel and energy reserves. Increasing energy consumption with a simultaneous increase in energy prices and widespread environmental degradation necessitates the development and implementation of energy efficient technologies to save fuel, materials and labor costs [5][6][7][8]. Energy conservation includes a wide range of interrelated activities and techniques to ensure efficient use of energy.…”

“…Energy conservation includes a wide range of interrelated activities and techniques to ensure efficient use of energy. One of the methods is to clean the walls of pipelines of heat exchange devices from scale, which forms during long-term operation and worsens the hydrodynamics of the flow and the intensity of heat transfer processes [5]. To ensure higher combustion efficiency of ekibastuz coal and, accordingly, less harmful emissions into the atmosphere, it is proposed to use laser ignition of the coal mixture [6].…”