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.
Виконано розрахункові дослідження щодо відвернення конденсатоутворення в газовідвідних трактах котельних установок під час використання методів: часткового байпасування відхідних газів котла повз теплоутилізатор, підмішування до димових газів після теплоутилізатора нагрітого повітря, підсушування цих газів шляхом їхнього нагрівання у поверхневих теплообмінниках та методу теплоізоляції димових труб. Наведено принципові схеми котельних установок у разі застосування систем теплоутилізації відхідних газів з використанням вказаних методів захисту газовідвідних трактів. Показано ефективність методу байпасування у широкому практичному діапазоні зміни основних визначальних параметрів. Для повітряного методу виявлено закономірності зміни тепловологісного режиму в газовідвідному каналі котельні залежно від температури нагрітого підмішуваного повітря і його частки в загальній витраті димових газів. Встановлено залежності потрібних для запобігання конденсатоутворенню рівнів підігріву димових газів від режимних параметрів котлів і типу димової труби для методу підсушування відхідних газів. Наведено дані щодо ефективності застосування для металевої та залізобетонної без футерування димових труб комплексу теплових методів, зокрема, підсушування димових газів і зовнішньої теплоізоляції корпусу труби. За результатами порівняльного аналізу ефективності зазначених теплових методів відвернення конденсатоутворення визначено межі раціонального застосування кожного з них. Ключові слова: газоспоживальні котли; глибоке охолодження відхідних газів; запобігання конденсатоутворенню; димові труби різного типу.
Purpose. Improving the environmental safety of chimneys of heating boiler plants with exhaustgas heatrecovery systems based on the use of the air method to prevent condensation in the exhaust ducts in combination with the method for drying the gases by heating them.Methodology. In conducting computational studies, the wellknown methods for thermal calculation of boiler plants and chimneys were used, as well as the results of our own experimental studies regarding heat transfer and hydrodynamics during deep cooling of the exhaustgases of boiler plants. The studies were carried out using single thermal methods in the heatrecovery schemes of boiler plants to prevent condensation in the exhaust ducts (drying flue gases and the air method) and a complex of these methods. At the same time, various options for heatrecovery systems and chimneys were considered in the presence of air heaters in boiler houses and in their absence.findings. The thermal and humidity characteristics of the exhaust gases at the mouth of the chimneys were studied at used dry and heated air to reduce the humidity of these gases with a wide temperature change. Under the conditions considered, the main parameters of the chimney anticorrosion protection systems were determined to prevent condensation in them under normative operating conditions of these chimneys. Based on the values of the obtained parameters, a comparative analysis of the effectiveness of the considered methods for protecting gas exhaust paths for various heatrecovery plants was performed. It is shown that for heating boilers, the use of the air method is most effective in complexheat recovery systems, characterized by the use of recovered heat to heat the return heatnetwork water and combustion air originality. For the first time, the application of the air method to prevent condensation in the gas exhaust paths of boiler plants with complex heatrecovery systems has been investigated.Practical value. The use of the proposed complex of thermal methods will significantly increase the reliability of the chimneys of heating boiler units in municipal heatpower engineering.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.