scholarly journals Influence of moisture content of combusted wood on the thermal efficiency of a boiler

2017 ◽  
Vol 38 (1) ◽  
pp. 63-74 ◽  
Author(s):  
Ladislav Dzurenda ◽  
Adrián Banski
Keyword(s):  
Carbon Monoxide ◽  
Moisture Content ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Heat Losses ◽  
Flue Gases ◽  
Heat Power ◽  
Emission Standards ◽  
Negative Effect ◽  
Gas Loss

Abstract In the paper the influence of moisture content of wood on the heat losses and thermal efficiency of a boiler is analysed. The moisture content of wood has a negative effect, especially on flue gas loss. The mathematical dependence of the thermal efficiency of a boiler is presented for the following boundary conditions: the moisture content of wood 10-60%, range of temperatures of emitted flue gases from the boiler into the atmosphere 120-200 C, the emissions meeting the emission standards: carbon monoxide 250 mgm−3, fly ash 50 mgm−3 and the heat power range 30-100%.

The Thermal Efficiency of a Hand-Fired Natural-Draught Lancashire Boiler

1950 ◽  
Vol 162 (1) ◽  
pp. 20-26
Author(s):  
T. F. Hurley ◽  
W. J. Sparkes
Keyword(s):  
Thermal Efficiency ◽  
Considerable Increase ◽  
Heat Losses ◽  
Flue Gases ◽  
Maximum Efficiency ◽  
Research Station ◽  
Simple Method ◽  
Excess Air ◽  
Secondary Air ◽  
High Level

Following the development of the Fuel Research Station “smoke eliminator” fire doors for hand-fired, natural-draught Lancashire boilers, a series of trials was carried out to obtain figures for their performance under a variety of conditions. Most of the trials were made with one or other of two sizes (”singles” and “smalls”) of a Northumberland coal, which was chosen because of its tendency to make heavy smoke; similar results were obtained with both sizes. The figures obtained during these trials, together with those of a few supplementary trials, are used to illustrate the effects of certain variables upon the performance of a boiler of that type. The information presented includes (1) the correlation of smoke intensity with the composition of the flue gases and with thermal efficiency, (2) the use of secondary air and suitable methods of firing to reduce the heat losses caused by incomplete combustion, (3) the effect of too little and of too much excess air upon efficiency, and (4) the effect of load upon efficiency. With the special fire doors, the admission of secondary air over the fire could easily be controlled and a simple method of firing could be employed. In consequence, the efficiency of combustion was maintained at a consistently high level without calling for exceptional skill or effort on the part of the fireman. Maximum efficiency was obtained when the quantity of secondary air was just sufficient to eliminate smoke: decreasing the percentage of excess air by a small amount below the optimum had as bad an effect upon efficiency as a considerable increase. Varying the load also affected efficiency, the maximum being reached well below rated load, but the variation in efficiency between 40 and 100 per cent of full load was comparatively small.

scholarly journals Dependence of the boiler flue gas losses on humidity of wood biomass

2015 ◽  
Vol 36 (4) ◽  
pp. 77-86 ◽  
Author(s):  
Ladislav Dzurenda ◽  
Adrián Banski
Keyword(s):  
Adverse Effect ◽  
Heat Production ◽  
Flue Gas ◽  
Flue Gases ◽  
Outlet Temperature ◽  
Wood Biomass ◽  
Model Application ◽  
Mathematical Relation ◽  
Gas Loss

Abstract The paper analyzes the influence of humidity of combusted wood biomass on the flue gas losses. A mathematical relation between flue gas losses of the boiler on wood biomass humidity is presented as well as temperature of flue gas emitted from the boiler into the atmosphere. The limits of model application for the humidity of wood biomass falls into the interval 10–60% whereas the range of temperatures of flue gases emitted from the boiler to the atmosphere is 120–200 °C. The influence of the humidity of wood biomass has an adverse effect on increasing the extent of the boiler flue gas losses and thus inefficiency of the heat production. The increase of the wood biomass humidity from the value of 10% to 60% with the outlet temperature of flue gases from the boiler 120 °C causes an increase in flue gas loss of the boiler from the value 8.37% to 12.43%, similarly the increase of flue gas loss by 200 °C from 15.19% to 22.55%, or the increase of the flue gas loss by 7.36%.

scholarly journals Increase the efficiency of the fireplace insert with loop heat pipe

2020 ◽  
Vol 328 ◽  
pp. 04002
Author(s):  
Lucia Martvoňová ◽  
Milan Malcho ◽  
Jozef Jandačka
Keyword(s):  
Heat Source ◽  
Heat Pipe ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Closed Loop ◽  
Flue Gases ◽  
Saturated Steam ◽  
Loop Heat Pipe

The article is focused on increasing the efficiency of fireplace inserts by means of a device used to preheat the combustion air with a part of the heat from the flue gases. The proposed device is a heat pipe with a closed loop, where its evaporator takes heat from the flue gas in front of the chimney orifice and transfers it via saturated steam to the condenser. This heats the combustion air and thus increases the thermal efficiency of a small heat source.

Numerical Simulation and Optimization of a Carbon Monoxide Boiler

2016 ◽  
Author(s):  
Guangwu Tang ◽  
Bin Wu ◽  
Chenn Q. Zhou
Keyword(s):  
Heat Transfer ◽  
Carbon Monoxide ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Gas Flow ◽  
Combustion Process ◽  
Three Dimensional ◽  
Measurement Data ◽  
Flow Characteristics ◽  
Simulation And Optimization

Carbon monoxide (CO) boilers play an important role in the petroleum refining industry, completing the combustion of CO in the flue gas generated by the regeneration of fluidized cracking catalyst. The heat released by the CO combustion is used to generate steam for use in the refinery. The flue gas flow path can have a significant effect on the thermal efficiency and operation safety of the boiler. In this paper, a CO boiler which had been experiencing low thermal efficiency and high operation risks was studied. A three-dimensional (3D) computational fluid dynamics (CFD) model was developed with detailed description on the combustion process, flow characteristics and heat transfer. The results obtained from the model have good agreement with the plant measurement data. The heat transfer between the tubes and the combustion flue gas was optimized by adding a checker wall.

Contribution to the research and development of radiation chambers in steam reforming. Influence of selected parameters on main characteristic quantities

1991 ◽  
Vol 56 (4) ◽  
pp. 831-846 ◽  
Author(s):  
Petr Stehlík
Keyword(s):  
Carbon Dioxide ◽  
Mathematical Model ◽  
Carbon Monoxide ◽  
Steam Reforming ◽  
Outer Surface ◽  
Flue Gas ◽  
Chemical Processes ◽  
Flue Gases ◽  
Maximum Temperature ◽  
Outlet Temperature

By means of a mathematical model simulating thermal chemical processes taking place in primary reformer radiation chamber, the influence of selected parameters on main characteristic quantities in steam reforming process was investigated. The parameters were divided into inlet parameters on flue gas side, inlet parameters on reaction mixture side and those of radiation chamber geometry. As main characteristic quantities outlet temperature of reaction mixture, maximum temperature of reaction tubes outer surface, outlet temperature of flue gases, absorbed heat, methane conversion into carbon dioxide and carbon monoxide as well as temperature distance from equilibrium were chosen.

scholarly journals Evaluation of boiler performance with using of bio-ethanol absorbed wood pellets

2021 ◽  
pp. 216-216
Author(s):  
Issac Joswa Lazaras ◽  
Raja Kandhasamy ◽  
Vijay Vijayaraj ◽  
Akilu Tekelemariam ◽  
Mebra Tufa ◽  
...  
Keyword(s):  
Carbon Monoxide ◽  
Thermal Properties ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Thermal Characteristics ◽  
Boiler Fuel ◽  
Wood Pellets ◽  
Renewable Fuel ◽  
Current Trends ◽  
Made In

In current trends the wood pellets are very significance role in the replacing of boiler fuel; it is a surrogate and renewable fuel. For this study comparative analysis of the fuel performance in the boiler is carried out effectively. Two categorize of fuel like as raw wood pellets and wood pellets are immersed in the bio- ethanol are taken to this experimental work. The thermal characteristics and thermal efficiency of the boiler with influence of two types of fuels are conducted efficiently. Normally the wood pellets having small pores it is used to absorb the bio ethanol while in immersion. Amid in the two fuels, wood pellets immersed in the bio ethanol are provided and increase the thermal properties as well as thermal efficiency compared to raw pellets. The flue gas constituent?s percentage such as carbon monoxide, oxygen, carbon monoxide and nitrogen oxides are analyzed, additionally the high temperature of flue gas also measured in the outlet of the chimney. No alteration is made in the boiler setup which is comfortable to both fuels.

COMPLEX HEAT-RECOVERY SYSTEMS FOR BOILERS OF SMALL AND MEDIUM POWER WITH INCREASED MOISTURE CONTENT OF FLUE GASES

2018 ◽  
Author(s):  
Nataliia Fialko ◽  
◽  
Raisa Navrodska ◽  
Maksym Novakivskii ◽  
Georgii Gnedash ◽  
...  
Keyword(s):  
Water Treatment ◽  
Moisture Content ◽  
Complex Systems ◽  
Thermal Efficiency ◽  
Heat Recovery ◽  
Waste Heat ◽  
Flue Gases ◽  
Boiler Water ◽  
Heating Boiler ◽  
Chemical Water

The results of studies of thermal and humidity regimes and thermal efficiency of complex systems for recovering waste heat from boiler plants with an increased moisture content of exhaust-gases are presented. Systems designed for heating boiler water, water of a chemical water treatment system and combustion air are considered. It is shown that, according to the heat engineering indications, systems with heating boiler water and combustion air have advantages over systems for heating input boiler water and water for chemical water treatment.

The Investigation on Application of Oxygen-Enriched Combustion in Cement Rotary Kiln

2013 ◽  
Vol 291-294 ◽  
pp. 804-808
Author(s):  
Xiao Rong Shen ◽  
Shan Qing ◽  
Xiao Jun Shi ◽  
Yi Xiao ◽  
Zhi Fang Yang
Keyword(s):  
Fuel Consumption ◽  
Rotary Kiln ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Flame Temperature ◽  
Exhaust Gas ◽  
Environmental Benefit ◽  
Gas Loss ◽  
The Cost ◽  
Products Of Incomplete Combustion

The investigation on application of oxygen-enriched combustion in cement rotary kiln shows that flame temperature in rotary kiln can be increased, which improves the utilization of coal and thermal efficiency of rotary kiln. And the fuel consumption and the cost of production can be reduced. In this situation, the objective of increasing production, improving quality and saving energy can be achieved. In the meanwhile, the requirement of air can be reduced in oxygen-enriched combustion. Thus the generation of flue gas and the products of incomplete combustion, which usually are CO, can be reduced. And then the exhaust gas loss and the generation and emission of CO2 and NOx can be accordingly reduced, which enhances to achieve the objective of reduction of pollutants and promote the environmental benefit greatly.

scholarly journals Numerical analysis of the thermal and fluid dynamic behavior of the flue gases in a traditional furnace for panela production

Inge CUC ◽  
2019 ◽  
Vol 15 (1) ◽  
pp. 133-141
Author(s):  
Edxon Stiven Meneses Chacón ◽  
Julián Ernesto Jaramillo-Ibarra ◽  
Elisabet Mas de les Valls
Keyword(s):  
Optical Thickness ◽  
Flue Gas ◽  
Thermal Efficiency ◽  
Fluid Dynamic ◽  
Heat Transfer Process ◽  
Flue Gases ◽  
Thickness Effect ◽  
Efficiency Increase ◽  
Real Size ◽  
Low Efficiency

Introduction: Panela is a product derived from sugar cane that is prepared using a traditional burner designed especially for this purpose. According to studies found in the literature, it was identified that the thermal efficiency of panela burners is 30% on average. Objective: The objective of this investigation is to contribute to the search for new alternatives for the improvement of the low efficiency present on these systems, mainly affecting the flue gases duct. Methodology: The development of this study is as follows: first, a research of the radiation and optical thickness effect in a simplified furnace is carried out. Afterward, a series of simulations with modifications in the design of the flue gas duct for a real size furnace are analyzed. Results: The results showed that the radiation effect must be considered and, even though the optical thickness is low, it has a relevant impact in the heat transfer process due to the high temperatures in the furnace. A chaotic movement of the gases implied more heat transferred to the heaters and high values of Nusselt with the addition of new elements in the duct were obtained. Conclusions: Arrangement 1, provides the best results with a Nusselt and thermal efficiency increase. No significant differences between the DOM and the P-1 radiation were found.

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