Negative Impact of Thermal Loads on Pressure and Non-Pressure Boiler Parts

Duda, Piotr; Felkowski, Łukasz

doi:10.3390/en16155768

Cited by 3 publications

(3 citation statements)

References 12 publications

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“…An important element of the modernization to the gas path was the gas flow regulator (6) with an electric drive, controlled automatically from the control cabinet. The section of the supply manifold between the gate valve and the quick-closing valves of the burners was connected to the safety line through a normally open blow-off valve (7).…”

Section: Modernization Of Boiler Equipmentmentioning

confidence: 99%

“…A characteristic feature of their work is frequently changing thermal loads within a wide range of power regulation from 50 to 100% [1]. Low thermal loads and frequent transient operating modes result in reduced fuel consumption efficiency and increased emissions of harmful substances into the atmosphere [2][3][4][5][6]. Ecological problems are exacerbated by the fact that such heat sources are often located in residential buildings that have relatively low chimneys [7][8][9].…”

Section: Introductionmentioning

confidence: 99%

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Improving the Fuel Combustion Quality Control System in Medium Power Boilers

Janta-Lipińska,

Shkarovskiy,

Chrobak

2024

Energies

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The constant development of electronic devices and components allows for older systems (which have been well received) with electronic control of combustion processes in municipal thermal energy to be improved to new levels, with significant economic and ecological effects. This article presents details of the development of an improved natural gas combustion quality control system in the modernized DKVR 6.5-13 steam boiler. This paper presents the results of comparative tests of this boiler obtained for various variants of the system operation. It has been proven that maximum boiler efficiency indicators and minimum toxicity of exhaust gases discharged into the atmosphere can be achieved by using a proposed control system. The system uses the regulated residual chemical underburning method, based on simultaneous control of the oxygen and carbon dioxide content in the exhaust gases. As a result of the use of the proposed method, an increase in boiler efficiency was achieved by 1.5–2.1% compared with standard automatic regulation and an increase by 0.3–0.8% compared with regulation based only on the oxygen content in the exhaust gases. These results were achieved by reducing the excess air coefficient. In addition, nitrogen oxide emissions were reduced by 25–30%, which, with a justified safe carbon monoxide content in exhaust gases of up to 250 ppm, reduced the exhaust gas toxicity index to 20%.

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Section: Modernization Of Boiler Equipmentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Improving the Fuel Combustion Quality Control System in Medium Power Boilers

Janta-Lipińska,

Shkarovskiy,

Chrobak

2024

Energies

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show abstract

“…As the power boiler is a pressure part during operation, the most important parameters of boiler steel are the creep limit, creep strength, the yield point at a specific temperature, and heat resistance. The boiler steel grade investigation regarding the impact of thermal loads on pressure and non-pressure parts in power boilers is presented in [33].…”

Section: Introductionmentioning

confidence: 99%

The Influence of Protective Coatings on High-Temperature Corrosion under Biomass Ash Deposits

Maciejczyk,

Maj,

Ciukaj

et al. 2023

Energies

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The presented research determined the performance of the protective coatings against the corrosion process under biomass and refuse-derived fuel (RDF) ash deposits. High-temperature corrosion tests were performed on steel grades intended for use in the fabrication of pressure parts working in elevated temperatures such as superheaters in power boilers. Two steel grades were investigated, P235GH and 16Mo3, and two protective coatings were applied, Inconel 625 and Alloy 310. The samples were sourced from the industrial boiler manufacturing company. The samples were exposed to two ashes originating from biofuels and one ash originating from RDF for comparison, all collected from Polish heat plants and power plants. Exposures were carried out in an oxidizing atmosphere for a maximum time of 504 h. The test temperatures of 480, 520, and 580 °C simulated superheater conditions of biofuel- and waste-fired power boilers. The corrosion kinetics were determined by weight change measurements conducted after 24, 168, and 504 h of the exposure. Regardless of the exposure temperature and the type of ash under which the samples were investigated, the use of 2.0 mm thick protective coatings resulted in smaller increases in the weight of the tested coupons which proves that alloy coatings give measurable results and are good remedies for chlorine-induced corrosion.

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Analysis of the Impact of Forces in Hanger Rods on Power Boiler Operation

Duda,

Felkowski,

Duda

2024

Applied Sciences

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Hanger rods intended for boiler suspensions on a metal structure require a special design approach that considers the total weight of the boiler structure that is to be carried. Unfortunately, a large reserve in the rods’ carrying capacity does not always guarantee the failure-free operation of a boiler. For this reason, it is very important to monitor the forces acting in the rods. Any negligence in this matter might cause a local excess of stresses in the boiler pressure part and result in periodic shutdowns of the boiler. Therefore, in order not to let this happen, adequate computational methods have to be developed. To date, the methods described in the literature and in design requirements have concentrated, first of all, on analyses of the boiler individual subassemblies or on small boiler units supported from the bottom at just a few points. The aim of this paper was to conduct a numerical analysis for a real high-capacity power boiler. The computations were performed based on experimentally measured forces in the hanger rods, and the results were verified by comparing the areas of stress concentration against the area where the boiler structure was regularly damaged.

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Negative Impact of Thermal Loads on Pressure and Non-Pressure Boiler Parts

Cited by 3 publications

References 12 publications

Improving the Fuel Combustion Quality Control System in Medium Power Boilers

Improving the Fuel Combustion Quality Control System in Medium Power Boilers

The Influence of Protective Coatings on High-Temperature Corrosion under Biomass Ash Deposits

Analysis of the Impact of Forces in Hanger Rods on Power Boiler Operation

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