The article is dedicated to a design of a pilot model of a 60 MW installation, operating according to a new promising compressorless combined cycle. In the course of the study, the weight-size parameters and functional indicators of the main parts of the energy complex were preliminarily determined. The auxiliary components of a compressorless combined cycle unit were selected, such as pumps, heat exchangers, compressors, pipelines and etc. Within a draft elaboration, preliminary weight, size and functional parameters of a turbine unit were defined, solutions were found for two groups of pumping equipment, and a plant prototype was designed. Additionally, the weight and size parameters of the plate heat exchangers were determined and a special design of shell-and-tube heat exchangers was designed to return the heat of combustion products. The results, obtained during the study, make it possible to simulate the behavior (develop dynamic models) of a compressorless combined cycle unit in all operating modes (from start-up to shutdown) under various conditions, as well as to carry out a feasibility study for the creation of such installations.
Hydroxyapatite (HA) coatings were deposited onto titanium alloy substrate using the microplasma spray (MPS) technique. The fractional-factorial experiment design method was employed to study the relationships between MPS parameters (amperage, plasma gas flow rate, spray distance and powder rate) and characteristics of HA coatings (microstructure, morphology, content of crystalline and amorphous phases, texture). Influence of coating thickness and the deposited coating heat treatment were evaluated also. The results show some peculiarities of HA coating formation in conditions of microplasma spraying process.
The method of microplasma spraying provides a small size of the spraying spot (a few millimeters), is characterized by small dimensions of relevant equipment and a low level of noise. A plasmatron with a device for feeding a wire has been designed to use wire as a material for coating spraying. Experiments on microplasma spraying of coatings were conducted using molybdenum, tungsten, titanium, nichrome, copper, brass, tin, aluminum, steel and stainless steel wires. The use has been made of wires with a diameter of 0.2-0.4 mm. Relationship between the wire material and diameter at a wire feed speed ensuring optimal conditions of the spraying process has been established. Structure and properties of coatings produced by the microplasma wire spraying method have been studied. Results of the studies are indicative of the possibility of thus producing the dense coatings at a spraying spot size of 3-8 mm.
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