Зменшення вологовмісту димових газів у конденсаційних теплоутилізаторах котельних установок
| Autor: | O. Yu. Glushak, S. I. Shevchuk, G. O. Gnedash, Nataliia Fialko, Raisa Navrodska |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2019 |
| Předmět: |
010302 applied physics
Thermal efficiency Waste management Boiler (power generation) Humidity 020206 networking & telecommunications 02 engineering and technology Boiler water 01 natural sciences газоспоживальні котельні установки теплоутилізаційні технології глибоке охолодження відхідних газів нагрівання води різних потреб вологовміст точка роси Dew point Heat recovery ventilation 0103 physical sciences Heat exchanger 0202 electrical engineering electronic engineering information engineering General Earth and Planetary Sciences Environmental science lcsh:SD1-669.5 lcsh:Forestry Water vapor General Environmental Science |
| Zdroj: | Науковий вісник НЛТУ України, Vol 29, Iss 8, Pp 116-119 (2019) |
| ISSN: | 2519-2477 1994-7836 |
| Popis: | The results of computational studies of the thermal and humidity characteristics of the exhaust gases of gas-fired boiler plants using modern heat recovery technologies are presented. These technologies realize deep cooling of exhaust gases, due to which the thermal efficiency of these plants is increased. However, such cooling leads to moisture loss in the gas-exhaust ducts, which impairs their operation. In this article, the use of these technologies is considered as measure that meets the draying of exhaust gases as a result of deep heat recovery. With such heat recovery, the loss of the part contained in the exhaust gases of water in a vapor state is realized. Due to the loss of water, the moisture content (absolute humidity) of the exhaust gases is reduced, and, consequently, the dew point of water vapor in the gases. The results of studies to reduce the absolute humidity of exhaust gases in the heat-recovery systems of boiler plants are presented intended for heating due to the recovered heat of water for various purposes: the return water of the boiler water for technological needs and hot water supply; as well as water for other needs. The levels of reduction of this humidity in the heat recovery equipment of these systems, called condensation heat-recovery exchangers, are determined. Dependences on the operating parameters of boilers and condensation heat exchangers of relative value β are established. The value of β characterizes the degree of draying of exhaust gases in these heat exchangers and is the ratio of the absolute values of the level of decrease in humidity in them to its initial value. It is shown that in conditions of deep recovery of exhaust gases heat of heating boiler plants, in particular when heating their return water, the absolute humidity of the gases as a result of heat recovery can decrease by 3-4 times at low relative boiler capacities. This corresponds to a decrease in the dew point of water vapor in gases from 58-54 oС to 35 oС. It is also shown that when recovery heat is used for technological needs and hot water supply, the level of decrease in the absolute humidity of exhaust gases increases significantly due to a decrease in the temperature of the water heated in the heat-recovery exchanger tw. So when heating cold water with an initial temperature tw |
| Databáze: | OpenAIRE |
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