Abstract
The issues of taking account of damage caused by exposure to high levels of local temperatures of gases, local non-uniformity of temperature and reliable assessment of residual resource of high-temperature elements are relevant and will provide for a reliable and long-term operation of energy generating equipment. A mathematical model is developed for the combustion process in burner devices with stabilizers based on the software complex ANSYS Fluent. We created a technique for determining the impact of levels of temperatures and their gradients on the assessment of residual resource of high-temperature elements of power and industrial equipment. Based on data on the work of industrial power equipment and results of physical experiments, we selected correct initial and boundary conditions that enabled adequate simulation of the influence of non-uniformity in the combustion products temperature field. Based on the software complex Solid Works, we performed calculation studies that take into account the gas-dynamics of gas flow that flows around the pipeline. The thermal and stress-strained states are defined and an estimation is conducted of operational lifecycle of pipeline in a boiler plant depending on the operating conditions of equipment. It was established that the residual operation time of a pipeline in a boiler plant is 77.4 thousand hours at static damageability from long-term loads of 57 %. Results of the research conducted might be used by implementing the recommendations proposed in large- and small-scale energy sector, industry and gas transportation system in Ukraine, as well as in other fields of science and technology.
Highlights
Energy sector in Ukraine employs a significant number of energy and industrial boilers of different capacity, furnaces, driers, gas-turbine plants, etc., which exhausted their operational life cycle
Results of calculations using ANSYS Fluent demonstrated that maximum temperature on the wall of the branch pipe is on the back wall of the branch pipe and is equal to 224 oC, minimum temperature in the neighboring section is 160 oC
Significant influence is exerted by a cooling water component that acts in the inner surface of the branch pipe
Summary
Energy sector in Ukraine employs a significant number of energy and industrial boilers of different capacity, furnaces, driers, gas-turbine plants, etc., which exhausted their operational life cycle. Work experience of such installations demonstrates that one of the essential factors that worsen reliability and efficiency is the non-uniform character of fuel distribution in combustion chamber, both in space and over time [1] This leads to the violation of temperature and thermal-hydraulic modes of heating surfaces, occurrence of additional thermocyclic loads on metal and, eventually, to installation’s breakdown. A violation of the optimum ratio “fuel-air” in separate burners and in the combustion chamber as a whole causes excessive chemical and mechanical incompleteness of fuel combustion, as well as nitrogen oxides emissions larger than those permitted by the European regulations [2, 3]
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