Results of Experimental Studies of the Heat Engineering Characteristics of Industrial Furnace Water-Heating Heat Recovery Units

Abstract

The results of a complex of experimental studies of thermal and aerodynamic indicators of water-heating heat-recovery exchangers of dusty exhaust gases from glass-making furnaces are presented. The studies were carried out on an experimental installation located behind a glass-melting furnace, and in the process of start-up operations during the introduction into operation of modular-type water-heating heat exchangers (HWM) developed by IET NAS of Ukraine at various glass-producing enterprises. The studies were carried out using modern measuring equipment according to certified methods of the services of metrological adjustment of glass-making enterprises, with the participation of which the experiments were carried out. In the process of research, the heating capacity, average values of the heat transfer coefficients and aerodynamic resistance of heat exchange surfaces, which are assembled from of panel packages formed by pipes with membranes, under conditions of heat-recovery of dusty furnace gases, were determined. The dynamics of the formation of a layer of deposits of technological dust on the surface of the panels on the gas side and the contamination coefficient of surface were also subject to research. According to the data on the heat-recovery exchanger heating capacity, the rational period of its operation between cleaning the working surfaces was determined. The experimental parameters obtained were also compared with their calculated values, as well as with the data of other researchers. According to the results of the studies, it is shown that TVM heat exchangers when used in conditions of dusty furnace gases are characterized by high thermal efficiency due to the layout of the heat exchange surface from the packets of panels formed by pipes with membranes, and the possibility of cleaning these surfaces from deposits of technological dust with practical restoration of the initial indicators. Based on the data obtained, the duration of the cycles for cleaning membrane heating surfaces from dust deposits was determined: for furnaces for the production of glass packaging, this period was 10-14 days, and for furnaces for melting medical glass - 5-7 days.

Improvement of Scientific Approaches to the Development of Engineering

“…As the main equipment of heat-recovery technologies, for example, glass melting furnaces, hot water heat-recovery units have traditionally been used, in which water is usually heated for heating and hot water supply of glass factories and adjacent residential and industrial facilities. [369][370][371].…”

“…The well-known methods of thermal calculation of heat exchangers of regenerative and surface types [373,374], as well as the results of our own studies of the dynamics of the dust content of the working surfaces of heat-recovery units of glass melting furnaces, were used [371].…”

“…The movement of heat carriers is cross with the passage of air in the pipes, and exhaust-gases in the annulus. In these pipes, the intensification of heat transfer inside the pipes The choice of heating surfaces for furnace air heaters (terminal recuperators) is determined by the characteristics of the exhaust-gases, which are usually characterized by a high level of solid technological carryover [371].…”

“…The layout of the heating surfaces from membrane panels provides the formation of slotted channels for the passage of exhaust-gases and the possibility of organizing effective cleaning of the heat exchange surface from the side of gases from possible dust deposits. The design of the recuperator allows it to be used for industrial furnaces with high levels of flue gas dustiness and to periodically clean the heating surfaces [371,375]. Thermal calculations of the terminal recuperator were carried out at an average level of dust content of working surfaces between cleanings.…”

“…When using heat-recovery systems, especially with hot air equipment, there is a problem of choosing structural materials for heat-recovery exchangers. According to the results of studies [371], the temperature of air heating in metal recuperators is limited by the heat resistance of the materials used. In unalloyed metal recuperators, it is advisable to heat the air no higher than 250 °C.…”