Environmental aspects of heat recovery systems of boiler plants

Fialko, Nataliia; Navrodska, Raisa; Ulewicz, Małgorzata; Gnedash, Georgii; Alioshko, Sergii; Shevcuk, Svitlana

doi:10.1051/e3sconf/201910000015

Cited by 5 publications

(2 citation statements)

References 5 publications

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“…On an economic front, factors such as uninsulated surfaces and poor ventilation lead to inefficient boiler performance, affecting the overall manufacturing process's productivity (Bari et al, 2022). Environmentally, the reliance on fossil fuels in boiler operations, along with high water consumption, presents significant challenges (Fialko et al, 2019;Roushan, 2021). This study emphasizes the need for renewable energy adoption and other sustainable practices to overcome these environmental barriers (Saha et al, 2021).…”

Section: Implications Of the Studymentioning

confidence: 99%

Steam Boilers in Ready-Made Garments Industry in Bangladesh: Existing Scenario and Scope for Development

Siraj,

Hasan,

Ahmed

et al. 2024

J. of Eng. Sci.

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Bangladesh's Ready-Made Garments (RMG) industry, historically prone to hazards including boiler explosions with numerous fatalities, has prompted the RMG Sustainability Council (RSC) to initiate boiler safety inspections. This study addresses the lack of empirical data on boiler operations in RMG factories, focusing on operational scenarios, risk factors, and remediation strategies. Conducted from March 2021 to March 2023, structured visual inspections across 1386 RMG factories assessed 2204 boilers. Key findings reveal that 34.99% of factories predominantly use a single boiler, 91.24% of boilers are government-registered, and the majority are imported (63.29%) with a steam generation capacity below 1,000 kg/hr (59.75%). Additionally, 63.11% were manufactured between 2010 and 2019, 79.63% burn fossil fuels, 54.60% are vertically oriented, and 82% use softened feedwater. The study also identifies 32 external risk factors across 11 categories, providing insights for decision-makers to enhance boiler operation safety and sustainability. By leveraging this inspection data, the research aims to bridge the empirical gap and offer a comprehensive understanding of the existing challenges in RMG boiler operations. Journal of Engineering Science 14(2), 2023, 89-105

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Section: Implications Of the Studymentioning

confidence: 99%

Steam Boilers in Ready-Made Garments Industry in Bangladesh: Existing Scenario and Scope for Development

Siraj,

Hasan,

Ahmed

et al. 2024

J. of Eng. Sci.

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“…Окрім теплового ефекту спостерігається значний екологічний ефект [6][7][8] завдяки зменшенню витрати палива та розчиненню в конденсаті оксидів вуглецю та азоту, а іноді і оксидів сірки. Контактуючи з водою, оксиди вуглецю і азоту в результаті хімічної реакції перетворюються у вугільну Н2СО3, азотисту НNO2 і азотну НNO3 кислоти.…”

Section: постановка проблеми та аналіз останніх досліджень і публікаційunclassified

Use and Disposal of Acidic Water Condensate From Gas-Fired Boiler Units

Fialko

Navrodska

Gnedash

et al. 2021

MEC

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During operation in boiler units of modern condensing boilers or modernization of old-style boilers, water condensate is formed due to heat-recovery equipment in the mode of cooling exhaust-gases below the dew point of water vapor. At natural gas is burned in equipment, the range of values of the pH value of the condensate is within the range of 3 ÷ 6. In this connection, the problem arises of the useful use of this condensate or its safe drainage into the sewer network. At useful use, the resulting condensate can be used for the needs of the boiler units (for washing boilers, in chemical water-purification systems) or outside the boiler house (for laundries, greenhouses, swimming pools, etc.). In the case of condensate drainage into the city sewer network, as a rule, its preliminary decarbonization is required. This is a necessary environmental measure and operational standard to protect the sewer network and related equipment, including treatment facilities, from premature wear. Among the directions of condensate decarbonization known in Ukraine, the most common are: - decarbonization by degassing by the contact method, which consists in removing CO2 from the heated solution by blowing air in the nozzle layer (ceramic or plastic), through which condensate flows. Degassing occurs due to the instability of the H2CO3 compound, which, when heated, easily decomposes into H2O and CO2; - chemical decarbonization, by combining carbon dioxide in an insoluble compound with various reagents, which are added to the container using a dispenser; - decarbonization by passing the condensate through a granular filter containing calcium carbonate, such as marble chips or lime. Removal of carbonic acid from condensate during filtration in a layer of marble chips is seen as the simplest method of decarbonization of water condensate from those considered. On the basis of this method of decarbonization, the authors propose a technical solution for the developed neutralizer with a description of its design and operating principle. The paper presents the results of calculated studies of the volumes of formed condensate and an example of its safe use in the case of modernization of a gas-fired water-heating boiler with a nominal thermal power of 1 MW by a heat-recovery system with simple or complex use of heat. It is shown that when using modern heat-recovery technologies in gas-fired boiler houses, there are different circuit and technical solutions for possible useful use or safe evacuation of acidic condensate formed during the implementation of these technologies. In cases where it is advisable to neutralize this condensate, there are effective methods for its decarbonization and appropriate equipment.

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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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Environmental aspects of heat recovery systems of boiler plants

Cited by 5 publications

References 5 publications

Steam Boilers in Ready-Made Garments Industry in Bangladesh: Existing Scenario and Scope for Development

Steam Boilers in Ready-Made Garments Industry in Bangladesh: Existing Scenario and Scope for Development

Use and Disposal of Acidic Water Condensate From Gas-Fired Boiler Units

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

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