scholarly journals Environmental aspects of heat recovery systems of boiler plants

2019 ◽  
Vol 100 ◽  
pp. 00015
Author(s):  
Nataliia Fialko ◽  
Raisa Navrodska ◽  
Malgorzata Ulewicz ◽  
Georgii Gnedash ◽  
Sergii Alioshko ◽  
...  
Keyword(s):  
Heat Recovery ◽  
Environmental Safety ◽  
Dew Point ◽  
Ecological Effect ◽  
Exhaust Gas ◽  
Environmental Aspects ◽  
Exhaust Gases ◽  
Harmful Emissions ◽  
Condensate Formation ◽  
Additional Water

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.

IMPROVING THE ENVIRONMENTAL PERFORMANCE OF CHIMNEYS OF BOILER PLANTS WITH HEAT RECOVERY SYSTEMS

2017 ◽  
Author(s):  
Nataliia Fialko ◽  
◽  
Victor Prokopov ◽  
Raisa Navrodskaia ◽  
Svetlana Shevchuk ◽  
...  
Keyword(s):  
Environmental Performance ◽  
Heat Recovery ◽  
Environmental Parameters ◽  
Surface Concentration ◽  
Exhaust Gas ◽  
Environmental Friendliness ◽  
Exhaust Gases ◽  
Heated Air ◽  
Harmful Emissions ◽  
Boiler Room

The researches results of thermotechnical and environmental parameters of emissions from chimneys of gas-fired boiler plants equipped with systems for deep heat recovery of exhaust gas are presented. The issues of the expediency of using heat methods for preventing condensation formation in chimneys to improve their environmental friendliness are considered. These are methods of partial bypassing of boiler exhaust gases past the heat recovery equipment, predrying the exhaust gases cooled after heat recovery in heat exchangers-gas heaters and mixing dry and heated air from the boiler room air heater to these gases. The efficiency of using these methods in order to improve the environmental performance of chimneys is analyzed. A relative decrease in the maximum surface concentration of such harmful emissions as nitrogen and carbon oxides due to the use of these heat methods has been determined. Comparison of the effectiveness of the application of these methods to improve the environmental friendliness of the considered chimneys is carried out. It is shown that the proposed methods used for anticorrosion protection of chimneys of boiler plants when using heat recovery technologies with deep cooling of flue gases contribute to an increase in the environmental friendliness of these chimneys.

scholarly journals ЗМЕНШЕННЯ ВИКИДІВ СУДНОВОГО ДИЗЕЛЯ УТИЛІЗАЦІЄЮ ТЕПЛОТИ РЕЦИРКУЛЯЦІЙНИХ ГАЗІВ ЕЖЕКТОРНОЮ ХОЛОДИЛЬНОЮ МАШИНОЮ

2019 ◽  
pp. 20-24
Author(s):  
Максим Андрійович Пирисунько ◽  
Роман Миколайович Радченко ◽  
Андрій Адольфович Андреєв ◽  
Вікторія Сергіївна Корнієнко
Keyword(s):  
Nitrogen Oxides ◽  
Alternative Fuels ◽  
Exhaust Gas ◽  
Exhaust Gases ◽  
Harmful Emissions ◽  
Harmful Substances ◽  
Main Engine ◽  
Gas Recirculation ◽  
Refrigeration Machine ◽  
Emissions Of Harmful Substances

The problem of air basin pollution of the World Ocean with harmful emissions from the exhaust gases of marine diesel engines is primarily associated with the creation of highly efficient technologies for the neutralization of nitrogen oxides NOx on exhaust gases from a diesel engine. Emissions of harmful substances from the combustion of marine fuels are limited by international atmospheric protection programs and the requirements of the International Maritime Organization (IMO). The requirements relate to almost all groups of harmful emissions in marine engines and the more stringent of them are primarily related to nitrogen oxides NOx and sulfur oxides SOx. To reduce harmful emissions from exhaust gases into the environment, scientists and world engine leaders use and suggest various methods for reducing the content of harmful substances in exhaust gases. The implementation of new standards in the areas of further improvement of the working process, the use of alternative fuels, fuel, and air additives, as well as selective catalytic reduction systems do not preclude further development of scientific research in the field of exhaust gas cleaning. One of the promising ways in environmentalizing marine internal combustion engines is the neutralization of harmful substances in exhaust gases through particular gas recirculation (EGR-technology). However, the use of such techniques conflicts with the engine's energy efficiency. In the work presented, the scheme-design solution of the exhaust gas recirculation system with using the heat of recirculation gases by an ejector refrigeration machine for cooling the air at the intake of ship's main engine is proposed. The effect of using the heat of recirculation gases for cooling the air at the intake of the engine is analyzed taking into account the changing climatic conditions for a particular vessel's route line. It is shown that the use of an ejector refrigeration machine reduces the air temperature at the entrance of the main engine by 5…15 ° С, which reduces the specific fuel consumption. This reduces emissions of harmful substances when the engine is running with recirculation of gases.

scholarly journals INCREASE OF ECOLOGICAL EFFECTIVENESS OF COMPLEX HEAT-RECOVERY SYSTEMS FOR BOILER PLANTS

2018 ◽  
Vol 40 (2) ◽  
pp. 27-32 ◽  
Author(s):  
N. M. Fialko ◽  
R. A. Navrodskaya ◽  
G. A. Presich ◽  
G. A. Gnedash ◽  
S. I. Shevchuk ◽  
...  
Keyword(s):  
Nitrogen Oxides ◽  
Fuel Consumption ◽  
Heat Recovery ◽  
Environmental Indicators ◽  
Steady Increase ◽  
Boiler Furnace ◽  
Boiler Water ◽  
Exhaust Gases ◽  
Harmful Emissions ◽  
Condensation Mode

It is revealed that the humidifying of blown air in complex heat recovery systems of gas-fired boiler plants provides the significant reduction in the concentration of nitrogen oxides in exhaust-gases due to the suppression of their formation in the boiler furnace when moisture is introduced with this air.  Problems of environmental protection and energy-saving became priority in world practice. The main directions of deciding these pressing problems in municipal heat-power engineering is to improve the environmental indicators of heating boiler plants and increase the efficiency of using fuel in them through the use of technologies for deep recovery of the exhaust-gases heat. The relevance of scientific problems in these directions is increasing due to the steady increase in the fuel-energy costs and the strengthening of requirements to reducing environmental pollution. When using these technologies of deep heat-recovery of exhaust-gases, the condensation mode of the heat-recovery equipment is realized, when, apart from to the so-called clear heat of these gases, the latent heat of condensation of the water vapor contained in them is also used. The condensation mode implementation also improves the ecological indicators of the boiler due to the reduction of fuel consumption and the dissolution in the resulting condensate of a part of harmful emissions formed during its combustion. The use of modern heat-recovery technologies for the gasfired boiler plants with complex use of recovered heat for the preheating of boiler water, water of the chemical waterpurification system and blowing air makes it possible to reduce fuel consumption in the boiler and, accordingly, its harmful emissions by 8...12 %. Humidification of the blowing air through the use of the recovery heat also provides a reduction of nitrogen oxides emissions to 60 % by suppressing their formation in the boiler combustion chamber.

scholarly journals Absorption of pollutants from exhaust gases by low-temperature heating surfaces

2021 ◽  
Vol 323 ◽  
pp. 00018
Author(s):  
Victoria Kornienko ◽  
Mykola Radchenko ◽  
Roman Radchenko ◽  
Marcin Kruzel ◽  
Dmytro Konovalov ◽  
...  
Keyword(s):  
Particulate Matter ◽  
Low Temperature ◽  
Internal Combustion Engines ◽  
Experimental Studies ◽  
Heating Surface ◽  
Dew Point ◽  
Fuel Oil ◽  
Exhaust Gas ◽  
Acid Vapor ◽  
Exhaust Gases

One of the most effective methods aimed to improving the environmental safety is fuel oil combustion in the form of specially prepared water-fuel emulsions. The combustion of water-fuel emulsion in internal combustion engines makes it possible to reduce a rate of low-temperature corrosion at wall temperatures below the dew point temperature of sulfuric acid vapor, to install a condensing lowtemperature heating surface in the exhaust gas boiler that leads to increase the efficiency of boiler. Therefore, it is of great importance to assess the effect of the presence of condensate (water, acid) and pollution on these surfaces on the processes of NOx, SO2 absorption from exhaust gases. Investigations of SO2, NOx and particulate matter emission were carried out on the experimental installation for fuel oil and water-fuel emulsion combustion with different water content. Using condensing heating surface enables to reduce the concentration of NOx and SO2 by 65 %. Experimental studies have shown that condensing heating surface ensures the capture of up to 30 % of particulate matter from the exhaust gas flow.

scholarly journals ЗМЕНШЕННЯ ВИКИДІВ ОКСИДІВ АЗОТУ З ВІДПРАЦЬОВАНИМИ ГАЗАМИ СУДНОВИХ ДИЗЕЛІВ

2018 ◽  
pp. 36-41 ◽  
Author(s):  
Роман Миколайович Радченко ◽  
Максим Андрійович Пирисунько
Keyword(s):  
Nitrogen Oxides ◽  
Thermodynamic Cycle ◽  
Combustion Products ◽  
Working Fluid ◽  
Exhaust Gas ◽  
Exhaust Gases ◽  
Exhaust Temperature ◽  
Harmful Emissions ◽  
Marine Engines ◽  
Harmful Substances

Solving the problem of ocean's airspace polluting with harmful emissions of ship-generated diesel engines by exhaust gases is associated with the creation of highly effective technologies for the neutralization of nitrogen oxides NOx from the diesel plant that apply both to vessels in service, designed and built. The air entering the engine is a working fluid that carries out a certain thermodynamic cycle, resulting in a change in its chemical composition, and the exhaust gas mixture contains many components. Emissions of harmful substances during the combustion of marine fuels are limited in accordance with international programs for the protection of the atmosphere and requirements of the International Maritime Organization IMO. Requirements apply all groups of harmful emissions of marine engines. The most stringent of them concern nitrogen oxides NOx and sulfur oxides SOx. To reduce harmful emissions from the exhaust gases into the environment, scientists and world leaders in engine construction, such as MAN Energy Solutions and Wärtsilä, apply and offer a variety of techniques to reduce the number of harmful substances in the exhaust gases. One of the most promising is the exhaust gas recirculation system (EGRS) of the ship diesel engine. Its advantage over other methods is the insignificant impact on the operation of the engine. During the exhaust gas recycling a temperature of the flame in the combustion chamber decreases, which leads to the reduction of NOx number. This is a consequence of the high rates of carbon dioxide and water vapor. Since the combustion rate is reduced, the exhaust temperature and the thermal load on the engine part are increased. The dilution of the inflow air with waste gas reduces the oxygen content in the supercharged air from 21 to 13%. The possibilities of the technology of the system of recirculation of exhaust gases of a marine engine are limited by the value of the ratio of O2/CO2 in the intake air, due to which the amount of combustion products at the inlet is limited to no more than 30%

scholarly journals Improving the efficiency of heat recovery circuits of cogeneration plants with combustion of water-fuel emulsions

2020 ◽  
pp. 154-154 ◽  
Author(s):  
Victoria Kornienko ◽  
Mykola Radchenko ◽  
Roman Radchenko ◽  
Dmytro Konovalov ◽  
Andrii Andreev ◽  
...  
Keyword(s):  
Heat Capacity ◽  
Power Plant ◽  
Heat Recovery ◽  
Internal Combustion Engines ◽  
Waste Heat ◽  
Dew Point ◽  
Exhaust Gas ◽  
Direct Flow ◽  
Exhaust Heat ◽  
Heating Surfaces

When using modern highly efficient internal combustion engines with lowered potential of exhaust heat the heat recovery systems receive increasing attention. The efficiency of combustion exhaust heat recovery at the low potential level can be enhanced by deep cooling the combustion products below a dew point temperature, which is practically the only possibility for reducing the temperature of boiler exhaust gas, while ensuring the reliability, environmental friendliness and economy of power plant. The aim of research is to investigate the influence of multiplicity of circulation and temperature difference at the exit of exhaust gas boiler heating surfaces, which values are varying as 20, 15, 10?C, on exhaust gas boiler characteristics. The calculations were performed to compare the constructive and thermal characteristics of the various waste heat recovery circuits and exhaust gas boiler of ship power plant. Their results showed that due to application of condensing heating surfaces in exhaust gas boiler the total heat capacity and steam capacity of exhaust gas boiler increases. The increase of exhaust gas boiler heat capacity is proportional to the growth of its overall dimensions. A direct-flow design of the boiler provides a significant increase in heat efficiency and decrease in dimensions. In addition, a direct-flow boiler circuit does not need steam separator, circulation pump, the capital cost of which is about half (or even more) of heating surface cost.

Planning and management of activities in the eld of environmental safety at the heating complex

2021 ◽  
pp. 75-79
Author(s):  
Yu.S. Pozdnyak ◽  
◽  
A.E. TIKHOMIROV ◽  
Keyword(s):  
Environmental Impact ◽  
Heat Production ◽  
Environmental Problem ◽  
Negative Impact ◽  
Environmental Safety ◽  
Environmental Risks ◽  
Ecological System ◽  
Environmental Aspects ◽  
Huge Amount ◽  
Harmful Emissions

Heat production activities are accompanied by a huge amount of harmful emissions that enter the environment and cause harm to it, and this is an environmental problem that requires attention. Therefore, the environmental safety of thermal production should be in the first place, since the issue of reducing the negative impact on the ecological system directly affects the sustainable existence of wildlife and humans.The article provides an assessment of environmental risks based on the following factors: the volume of the environmental impact on the environment, the severity of the consequences for the environment, the probability of the environmental impact, the duration of the environmental impact, as well as a scale of assessments of the significance of environmental aspects, the form of the register of environmental aspects and the list of significant environmental aspects.

Improving the Environmental Safety of Transport Engines Using Modified Engine Oil

2020 ◽  
Vol 24 (1) ◽  
pp. 9-13
Author(s):  
S.A. Petukhov ◽  
L.S. Kurmanova ◽  
M.P. Erzamaev ◽  
D.S. Sazonov ◽  
D.S. Chinchenko
Keyword(s):  
Experimental Studies ◽  
Environmental Safety ◽  
Engine Oil ◽  
Exhaust Gas ◽  
Motor Oil ◽  
Harmful Emissions ◽  
Harmful Substances ◽  
Technical Solutions ◽  
Emissions Of Harmful Substances

The problems of reducing emissions of harmful substances by transport engines are considered. It has been established that the use of modified engine oil is an effective way to increase the environmental safety of transport engines. The effectiveness of additives to improve the backsize of motor oil and reduce harmful emissions in the exhaust gas was evaluated. Methods for feeding additives are proposed. Technical solutions for the use of additives for transport engines have been developed. Experimental studies are presented to assess the effect of modified engine oil on the environmental safety of an engine.

scholarly journals Reducing nitrogen oxide emissions in boilers at moistening of blowing air in heat recovery systems

2019 ◽  
Vol 100 ◽  
pp. 00055 ◽  
Author(s):  
Raisa Navrodska ◽  
Nataliia Fialko ◽  
Georgii Presich ◽  
Georgii Gnedash ◽  
Sergii Alioshko ◽  
...  
Keyword(s):  
Experimental Data ◽  
Nitrogen Oxides ◽  
Heat Recovery ◽  
Fuel Combustion ◽  
Exhaust Gases ◽  
Relative Decrease ◽  
Water Purification System ◽  
Harmful Emissions ◽  
Steam Boilers ◽  
Useful Heat

Considered indicators of reducing harmful emissions into the environment by gas-fired water-heating and steam boilers of the municipal heat-power engineering, which are equipped with heat-recovery systems of boiler exhaust-gases. The results of studies on the relative decrease of emissions of nitrogen oxides and other harmful substances generated during fuel combustion in boilers when used for boilers complex heat-recovery plants for heating heat-network water and water for a chemical water-purification system of a boiler plant, as well as for heating and humidifying combustion air are presented. It is shown that the use of such complex heat-recovery systems, due to the useful heat of exhaust-gases from boilers, provides a reduction in fuel consumption and, consequently, the volumes of harmful emissions generated during its combustion, by 8–12%, depending on the mode of operation of boilers during the heating period. The efficiency of using combustion-air humidifying in these installations to decrease the level of formation of nitrogen oxides in the combustion area of boilers is considered. It is also shown that the use of these systems provides a decrease emissions of nitrogen oxides to the environment by up to 60% by reducing the combustion temperature in the combustion area at moisture introduction with the combustion air and, as a result, suppression of formation these oxides during fuel combustion in boilers. The substantiation of the accuracy of the obtained calculated values of the levels of relative decrease of emissions of nitrogen oxides with the moisture introduction into the boiler by comparing them with experimental data is given. Comparative of the results shows a good agreement between the calculated and experimental data.

scholarly journals Emission of pollution from motor vehicles with respect to selected solutions of roundabout intersections

2017 ◽  
Vol 168 (1) ◽  
pp. 140-144
Author(s):  
Artur JAWORSKI ◽  
Kazimierz LEJDA ◽  
Maksymilian MĄDZIEL
Keyword(s):  
Traffic Congestion ◽  
Input Data ◽  
Time Of Day ◽  
Motor Vehicles ◽  
Exhaust Gas ◽  
Emission Model ◽  
Average Speed ◽  
Exhaust Gases ◽  
Harmful Emissions ◽  
The City

The article concerns the assessment of emmision of selected two-lane roundabout functioning in the city of Rzeszow and its alternate turbo version. In the work was considered four scenarios that represent two different in terms of traffic congestion time of day. The results of the emission of selected components of the exhaust gas (NOx and particulates PM10) were obtained on the basis of calculations of emission model VERSIT+ Enviver. While the input data for the calculations were taken from the modeled options of roundabouts in the Vissim program. The results from the Enviver program were compared to calculations from mesoscopic model COPERT 5. The results show that the overall reduction in average speed, as well as increased frequency of braking and sudden acceleration, directly contribute to the growth of harmful emissions. However, with respect to comparision of turbo roundabout in regard of currently running two-lane roundabout can be observed reduction of selected components of exhaust gases emission about approx. 1/3.

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