Thermal-hydraulic analysis of a 600 MW supercritical CFB boiler with low mass flux

Pan, Jie; Yang, Dong; Chen, Gongming; Zhou, Xu; Bi, Qincheng

doi:10.1016/j.applthermaleng.2011.08.009

Cited by 39 publications

(8 citation statements)

References 7 publications

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“…The probe surface temperature is selected as 700 K according to the typical heating surface temperature in larger-scale CFB boilers. 48,49 The ambient temperature is set as 300 K. Insulated cotton with a thickness of 0.1 m is set as the object of the furnace wall according to the test rig.…”

Section: Energy and Fuelsmentioning

confidence: 99%

Investigation on Sodium Fate for High Alkali Coal during Circulating Fluidized Bed Combustion

Cheng

Liu

et al. 2019

Energy Fuels

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For better understanding the release and transformation mechanisms of sodium compounds during high alkali coal combustion in circulating fluidized bed (CFB) boilers, a sodium migration model of coal combustion was proposed in this work. The model included submodels of sodium species release, chemical reactions, vapor condensation, particle deposition, and shedding. They were coupled in a three-dimensional CFB comprehensive combustion model to predict the sodium fate. Example simulation was conducted on a 30 kW CFB test rig where experimental measurements have been done. The distributions of sodium compounds in gas, ash, and deposits were computed during the high alkali Zhundong coal combustion. Results show that good agreements are achieved between the simulations and the experiments on the hydrodynamics, temperature, gas species, and sodium distributions.

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Section: Energy and Fuelsmentioning

confidence: 99%

Investigation on Sodium Fate for High Alkali Coal during Circulating Fluidized Bed Combustion

Cheng

Liu

et al. 2019

Energy Fuels

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“…An extensive analysis of the calculation of thermohydraulic operating conditions of a fluidized bed boiler with a circulating bed operating on supercritical parameters is presented in [17][18][19]. Authors presented the assumptions of the mathematical model allowing analysis of the boiler's operation taking into account the variable mass flow of the circulating factor in it, and presented changes in the temperature distribution of the circulating medium and metal from which the furnace chamber is made in selected circulation contours depending on the boiler load and stream size mass of the medium flowing through the boiler.…”

Section: Literature Reviewmentioning

confidence: 99%

Review of the literature discussing the problem of uneven thermal stresses in the furnace chamber

Majdak

2018

MATEC Web Conf.

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Uneven thermal stresses occurring in the walls of the furnace chamber in high power boilers are the reason for the occurrence of significant thermal stresses. The occurrence of excessive stress leads to serious damage to the waterwall tubes, which result in the necessity of more frequent repairs of the boiler. Therefore, finding a way to reduce stress values is one of the key challenges in improving productivity and increase the service life of boilers. In this paper will be presented the review of the literature concerning the problem of uneven temperature distribution on the surface of the combustion chamber walls. There will also be presented studies that discuss the methods of modifying the furnace chamber to reduce the values of the stresses occurring in it.

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“…In turn, the authors of articles [7][8][9] focused on the analysis of working conditions of a fluidized bed boiler operating on supercritical parameters, in the case of a decrease in the mass-flow of the working fluid flowing through the system. In papers are presented the temperature distributions of the boiler elements and the fluid flowing through them depending on the mass-flow of the working fluid and the thermal load of the boiler.…”

Section: Introductionmentioning

confidence: 99%

Analysis of thermal flow in waterwall tubes of the combustion chamber depending on the fluid parameters

Majdak

Grądziel

2019

THERM SCI

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Original scientific paper https://doi.org/10.2298/TSCI19S4333MThe article presents the method of determining the temperature distribution in waterwall tubes of the combustion chamber. To simulate the operating conditions of waterwall tubes have been selected the model with distributed parameters, which is based on the solution of equations of the energy, mass and momentum conservation laws. The purpose of the calculations is determining the enthalpy, mass-flow and pressure of the working fluid flowing inside the tubes. The balance equations have been transformed into a form in which spatial derivatives are on the left, and the right side contains time derivatives. Then the time derivatives were replaced with backward difference quotients, and the obtained system of differential equations was solved by the Runge-Kutta method. The analysis takes into account the variability of fluid parameters depending on the mass-flow at the inlet of the tube and heat flux on the surface of the tube. The analysis of fluid parameters was carried out based on operating parameters occurring in one of the Polish supercritical power plants. Then it was compared with characteristics for systems operating at increased or reduced thermal flux on the walls of the furnace or systems operating at increased or reduced massflow of the working fluid at the inlet to the waterwall tube.

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Thermal-hydraulic analysis of a 600 MW supercritical CFB boiler with low mass flux

Cited by 39 publications

References 7 publications

Investigation on Sodium Fate for High Alkali Coal during Circulating Fluidized Bed Combustion

Investigation on Sodium Fate for High Alkali Coal during Circulating Fluidized Bed Combustion

Review of the literature discussing the problem of uneven thermal stresses in the furnace chamber

Analysis of thermal flow in waterwall tubes of the combustion chamber depending on the fluid parameters

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