Increase the Efficiency of Complex Heat-Recovery Systems for Heating and Humidifying  of Blown Air of Gas-Fired Boilers

Fialko, Nataliia; Presich, Georgii; Gnedash, Georgii; Shevchuk, Svitlana; Dashkovska, I. L.

doi:10.31472/ihe.3.2018.06

Cited by 8 publications

(4 citation statements)

References 3 publications

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“…The relevance of scientific tasks in these areas is increasing due to the constant increase in the cost of fuel and the increasing requirements to reduce environmental pollution. The main ways to solve these important problems in the production of heat energy in the municipal sector is to improve the environmental performance of gas-fired boilers and increase the efficiency of their use of fuel in the application of technologies the deep recovery-heat of the exhaust-gases [1][2][3][4][5][6] or other companion waste heat [7]. It should be noted that the use of these technologies is characterized by obtaining an environmental effect in several directions.…”

Section: Introductionmentioning

confidence: 99%

Environmental aspects of heat recovery systems of boiler plants

et al. 2019

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The results of studies on improving the environmental characteristics of boiler plants of municipal heat-power engineering in the application of technologies for the deep recovery of heat from exhaust-gases of gas-fired boilers are presented. The data on the reduction of environment by reducing the amount and temperature of harmful emissions resulting from fuel combustion are given. The data are given for boiler plants equipped with complex heat-recovery systems characterized by cooling the exhaust-gases below the dew point of the water vapor contained in them. It is shown that the decrease in emissions is due to a decrease in fuel consumption in boilers due to the beneficial use of the heat of exhaust-gases in these systems and the dissolution of nitrogen and carbon oxides in the condensate, formed in the heat-recovery equipments. The analysis of improving the environmental safety of boiler plants when used in heat-recovery technologies of corrosion protection systems for chimneys has been performed. Anticorrosion protection is provided by preventing condensate formation in the exhaust-gas ducts of boiler plants when using technologies for the deep recovery of exhaust-gas heat. To prevent condensate formation, the method of pre-drying cooled exhaust-gases in a heat exchanger-preheater installed after heat-recovery equipment is used. It is also shown that the use of complex heat-recovery systems provides in the boiler plant additional water in the form of condensate formed during condensation of moisture from exhaust-gases. Receipt of this condensate is another ecological effect of heat-recovery, which allows reducing the consumption of natural water resources for supply municipal heat networks.

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Section: Introductionmentioning

confidence: 99%

Environmental aspects of heat recovery systems of boiler plants

et al. 2019

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“…In connection with the planned trend to tigh ten the requirements for the reduction of nitro gen oxide emissions from boiler plants, last time heatrecovery technologies have been developed, in which an increased environmental effect is ac hieved by a significant decrease of these emissions with boiler's fluegases. this effect is due to the use of a part of the heat of the exhaustgases of the boiler to heat water for humidifying the com bustion air [8][9][10]. the supply of humidified air into the furnace of the boiler leads to a decrease of the temperature in its combustion space and, as a result, to the suppression of the formation of nitrogen oxides.…”

mentioning

confidence: 99%

Study of Heat Recovery Systems for Heating and Moisturing Combustion Air of Boiler Units

Fialko¹,

Navrodska²,

Gnedash³

et al. 2020

Sci. innov.

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Introduction. One of the ways to save natural gas and to improve the environmental conditions in the municipal heat-power engineering is to use progressive technologies for recovering the heat of flue gases from boiler plants, in which the condensation mode of operation of heat-recovery equipment is implemented. To inc rease the ecological effect in some heat-recovery systems, a humidification process of the combustion air occur. This lowers the combustion temperature of the fuel and reduces the concentration of nitrogen oxides in the combustion products. Problem Statement. At humidifying combustion air, the boiler exhaust-gases are characterized by high moisture content. In the known calculation methods, there are no data on heat transfer under these conditions. This is a problem for conducting thermal calculations of such installations. Purpose. Establishing patterns of heat transfer at an increased moisture content of exhaust-gases in heatrecovery equipment, consisting of bundles of transverse-finned pipes, and determining the main parameters of the proposed complex installation. Materials and Methods. Experimental studies of heat transfer were carried out on a specially created stand. For the thermal and hydraulic calculation of a heat-recovery installation, known calculation methods were used, taking into account the experimental data obtained. Results. The laws of heat transfer during deep cooling of exhaust-gases with moisture content X = 0.15-0.30 kg/kg d.g. are established. The thermal, hydraulic and operating characteristics of the proposed complex heat-recovery installation with heating and humidification of the combustion air in different modes of operation of the boiler are determined. This installation has been introduced; its tests have been carried out, which have confirmed high thermal and environmental efficiency. Conclusions. The application of the proposed complex heat-recovery unit allows increasing the coefficient of the use heat of fuel of boiler depending on its operating mode by 13-20%. K e y w o r d s : heat-recovery of exhaust-gases, increased moisture content, condensation mode, heat-exchange, efficiency use of fuel, and reduction of harmful emissions.

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“…In connection with the planned trend to tighten the requirements for the reduction of nitrogen oxide emissions from boiler plants, last time heat-recovery technologies have been developed, in which an increased environmental effect is achieved by a significant decrease of these emissions with boiler's flue-gases. this effect is due to the use of a part of the heat of the exhaust-gases of the boiler to heat water for humidifying the combustion air [8][9][10]. the supply of humidified air into the furnace of the boiler leads to a decrease of the temperature in its combustion space and, as a result, to the suppression of the formation of nitrogen oxides.…”

mentioning

confidence: 99%

Study of Heat Recovery Systems for Heating and Moisturing Combustion Air of Boiler Units

Fialko¹,

Navrodska²,

Gnedash³

et al. 2020

Nauka innov.

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Introduction. One of the ways to save natural gas and to improve the environmental conditions in the municipal heat-power engineering is to use progressive technologies for recovering the heat of flue gases from boiler plants, in which the condensation mode of operation of heat-recovery equipment is implemented. To inc rease the ecological effect in some heat-recovery systems, a humidification process of the combustion air occur. This lowers the combustion temperature of the fuel and reduces the concentration of nitrogen oxides in the combustion products.Problem Statement. At humidifying combustion air, the boiler exhaust-gases are characterized by high moisture content. In the known calculation methods, there are no data on heat transfer under these conditions. This is a problem for conducting thermal calculations of such installations.Purpose. Establishing patterns of heat transfer at an increased moisture content of exhaust-gases in heatrecovery equipment, consisting of bundles of transverse-finned pipes, and determining the main parameters of the proposed complex installation.Materials and Methods. Experimental studies of heat transfer were carried out on a specially created stand. For the thermal and hydraulic calculation of a heat-recovery installation, known calculation methods were used, taking into account the experimental data obtained.Results. The laws of heat transfer during deep cooling of exhaust-gases with moisture content X = 0.15-0.30 kg/kg d.g. are established. The thermal, hydraulic and operating characteristics of the proposed complex heat-recovery installation with heating and humidification of the combustion air in different modes of operation of the boiler are determined. This installation has been introduced; its tests have been carried out, which have confirmed high thermal and environmental efficiency.Conclusions. The application of the proposed complex heat-recovery unit allows increasing the coefficient of the use heat of fuel of boiler depending on its operating mode by 13-20%. K e y w o r d s : heat-recovery of exhaust-gases, increased moisture content, condensation mode, heat-exchange, efficiency use of fuel, and reduction of harmful emissions.

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Increase the Efficiency of Complex Heat-Recovery Systems for Heating and Humidifying of Blown Air of Gas-Fired Boilers

Cited by 8 publications

References 3 publications

Environmental aspects of heat recovery systems of boiler plants

Environmental aspects of heat recovery systems of boiler plants

Study of Heat Recovery Systems for Heating and Moisturing Combustion Air of Boiler Units

Study of Heat Recovery Systems for Heating and Moisturing Combustion Air of Boiler Units

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