Technical and environmental performance of 10 kW understocker boiler during combustion of biomass and conventional fuels

Junga, Robert; Wzorek, Małgorzata; Kaszubska, Mirosława

doi:10.1051/e3sconf/20171901009

Cited by 8 publications

(5 citation statements)

References 17 publications

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“…Researches presented by other authors show similar level of calorific value of fuels from sewage sludge compering to tested biofuels. According to Jiang et al ( 2016 ), pellets made from sewage sludge and rice straw have calorific value of 15 MJ/kg and from sewage sludge and unclassified oats above 14 MJ/kg (Junga et al 2017 ).…”

Section: Resultsmentioning

confidence: 99%

Solar drying of granulated waste blends for dry biofuel production

Wzorek

2021

Environ Sci Pollut Res

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In the paper, results of drying biofuels from sewage sludge using solar energy are presented. Drying rates of biofuels made from sewage sludge and coal slime (PBS), sewage sludge and meat and bone meal (PBM), and sewage sludge and sawdust (PBT) with 15-mm and 35-mm granule particle size were studied. Tests were performed in a solar greenhouse dryer equipped with a specially designed mixing system. Experiments were aimed at determining the drying time of biofuels under various weather conditions in the southwestern part of Poland. In summer, in order to determine the best conditions for drying, tests were performed using various parameters, i.e., layers of various thickness, such as 5, 10, and 20 cm, and various mixing intensity (no mixing, mixing 3 and 5 times/day). In spring and the fall, 10-cm thick layers combined with 5 times mixing of fuels per day were used. The performed tests demonstrated that it is beneficial to dry fuels in 10-cm thick layer. In spring and the fall, PBS and PBM biofuels laid out in layers with just such thickness showed moisture content reduced to less than 10% after 8 days, while the PBT biofuel reached the same level after 14 days. In summer, the same result may be obtained for all the biofuels after 4 days on average. The presented original method of solar drying of biofuels obtained from sewage sludge and other waste may be used in wastewater treatment plants which process sewage sludge into fuels without incurring any additional costs for supplying heat.

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Section: Resultsmentioning

confidence: 99%

Solar drying of granulated waste blends for dry biofuel production

Wzorek

2021

Environ Sci Pollut Res

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“…Research of the technologies of installations and furnaces operated on low-grade solid fuels under conditions of using water with increased hardness have shown the need to debug the operating mode of the heating boiler, taking into account the combustion process, as a determining factor in the efficiency of oxidation of fuel elements and intensification of heat transfer in the device [1][2][3][4][5]. At the same time, the process of burning low-grade fuels is associated with environmental problems, primarily CO and CO2 emissions [6][7].…”

Section: Introductionmentioning

confidence: 99%

Effectiveness analysis of Maikuben brown coal combustion in the heating boiler “Kamkor-300”

Atyaksheva

Atyaksheva²,

Ryvkina

et al. 2022

J. Phys.: Conf. Ser.

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This research presents the results of studying the efficiency of Maikuben brown coal combustion in low-power heating boilers using the case of the Kamkor-300 boiler. Improving the combustion efficiency of low-grade fuels is directly related to fuel economy and the decrease of toxic emissions into the atmosphere. The research results show the possibility of adjusting the boiler according to the “fuel-air” ratio in the furnace volume, without violation of its general heat exchange structure and changing the heat-transfer operation in the device. In the research the adjustment of the operation of a long-burning boiler with an upper air supply in order to increase the time of combustion gases dwell in the boiler furnace volume drum is proposed. It is also possible to reduce the excess air coefficient to 0.55 and to operate the boiler under conditions of oxygen deficiency. Under such conditions, in the presented boiler, additional synthesis gases are released during the combustion of low-grade coals, in particular of coal rank “B”, to obtain an additional thermal effect. The resulting thermal effect leads to an increase of the boiler efficiency and its operational and economic indicators.

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“…The calorific value of the fuel or the ash and sulfur content are important here, but the key parameters are: reactivity, shape and size of the fuel, shape stability, mechanical strength, and porosity [12,13,14]. The needs and requirements of the market and fuel consumers, in particular the users of top-combustion boilers, are the following: the desired fuel should be of a uniform size, combustion heat (> 25 MJ/kg), low humidity (< 7%), reduced PM2.5, NOx, SOx, CO, VOC, heavy metals emission, low sinterability, low under-combustion and reduced amount of exhaust gases per GJ of heat energy produced [15,16,17,18]. This goal can be achieved by using additives in the form of sorbents and catalysts in the production process, which can be distributed throughout the entire fuel volume [19,20,21].…”

Section: Introductionmentioning

confidence: 99%

Comparative Analysis of Combustion of Qualified Composite Fuel for the Transitional Period in the Household and Communal Sector in Poland

Bembenek

Dzik

Smyła

et al. 2022

Management Systems in Production Engineering

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The article presents the results of laboratory combustion tests of the microbriquette obtained from useless coal (grain class of < 5 mm) generated in the production of “eco-pea” (eko-groszek) coal. The briquettes of 1.5 and 2.5 cm3 were made in a roller press of crushed coal granulation down to 2 mm, mixed with a binder and/or catalytic additives and sorbents, then dried to final moisture of about 7%. The tests were carried out on a specially designed stand enabling to determine the differential curve of the weight loss of samples heated to the ignition temperature and then burnt with laminar airflow by natural chimney draft. Comparative tests were carried out with ecopea coal from the “ZG Sobieski” mine. The results indicate that composite fuels, in the form of microbriquette, ignite faster, burn at a higher temperature and leave less ash when burned than lump coal. The greater reactivity of the briquette concerning the lump coal allows for minimizing the air rate by about 10%, which also reduces the exhaust gas volume by the same amount and the stack losses. It reduces the velocity of dust lifting, which leads to the reduction of their emission.

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Technical and environmental performance of 10 kW understocker boiler during combustion of biomass and conventional fuels

Cited by 8 publications

References 17 publications

Solar drying of granulated waste blends for dry biofuel production

Solar drying of granulated waste blends for dry biofuel production

Effectiveness analysis of Maikuben brown coal combustion in the heating boiler “Kamkor-300”

Comparative Analysis of Combustion of Qualified Composite Fuel for the Transitional Period in the Household and Communal Sector in Poland

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