The aim of the study is to develop a design of an air-heating recuperator for a purge ventilation system of a building inbuilt for the purpose of utilizing lower-grade heat from ventilation gases and emissions with the associated production of thermoelectricity.
An experimental design of an air-heating recuperator as part of an experimental purge unit has been developed. It includes a thermoelectric source of electromotive difference, which operates as a result of the associated conversion of heat into electricity, which allows utilizing lower-potential heat of ventilation releases from 40 ° C to 60 ° C.
This article is dedicated to problems of simultaneous generating of both thermal and electric power using thermoelectric effect of working pressure jet burner. A pilot plant description, study methods and results of the experiment are given below. Possibility of electric power generating with using thermoelectric add-on for utility pressure jet burners is also displayed below.
Justification and basic design of emulsion-film type of absorber are given. An example of realization of technical solution to flue gas cleaning from nitrogen oxides and utilization of their heat, making use of an absorber built around a standard heat exchanging equipment (a pilot-scale air heater), is discussed. The equipment can be used to clean flue gases, heat blast air to 70°C, and raise boiler efficiency.It is known that hazardous impurities of flue gases (NO x , etc.) are poorly soluble in water, so a substantial volume of water or use of chemical reagents is needed for their absorption. But in the industry use of chemical reagents for cleaning flue gases, because of the large scale of their emissions, raises heat energy cost and causes fouling of the effluent gases with these reagents. So the preferred alternative is to use an ecologically safe and cheap absorbent, such as water. A comparison of NO oxidation rates in gas and liquid phases (including water) at an NO content of up to 1% in the gas phase (NO x content in the flue gases is also less than 1%) showed that 50% of the NO underwent oxidation in the liquid phase [1]. This fact suggests that in the absorption process, NO undergoes oxidation not only in the gas phase but also in the liquid phase. This allows application of absorption for cleaning flue gases from nitrogen oxides because the volume of the liquid phase in the mass exchange process is hundreds and thousands of times less than the volume of the gas phase. So the technological operations with a liquid can be carried out in small reaction volumes. A significant irrigation density is required if water is used as the absorbent.Based on the conditions of implementation of absorption cleaning processes and on the demands generally made on the tail-end equipment for boiler units, the absorption apparatus assembly for cleaning flue gases must have the minimum aerodynamic resistance. In this context, it is essential to provide for a parallel flue gas cooling process, which will help raise the cleaning efficiency as a whole. Tube film absorbers meet such demands [2].In practice, absorption units with reverse and forward phase flow as well as single-and multi-stage units with recirculation of the liquid are used. If the coefficients of absorption A are fairly high, the difference between the coefficients of extraction ϕ for various types of phase flow (motion) diminishes markedly. This is observed in the cases where the equilibrium concentration y * = 0 or varies very little (for example, in the case of low absorptive concentration in the liquid). In such cases, it is advantageous to use forward flow apparatuses [3].One of the most popular methods of absorption of poorly soluble gases is recirculation of the absorbent, which makes it possible to reduce consumption of fresh absorbent with simultaneous increase of irrigation density and mass transfer rate resulting from increase in the coefficient of mass transfer in the liquid phase. At the same time, in order to ensure recirculation in the presently...
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