Coupled Heat Transfer Simulation of the Spiral Water Wall in a Double Reheat Ultra-supercritical Boiler

Dong, Jiaoyun; Zhou, Tuo; Wu, Xiaojiang; Zhang, Jian; Hu, Fan; Zhang, Zhongxiao

doi:10.1007/s11630-018-1072-6

Cited by 16 publications

(7 citation statements)

References 26 publications

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“…Although the magnitude of temperature had little error compared with some literatures, the heat transfer trend of the wall was accordant with the results of relevant paper 26,27,38 . It revealed that the highest temperature was 812.51 K at the fire side fin under ideal condition, which was lower than the maximum allowable temperature of material 12Cr1MoV (858 K) and closed to the research result of Dong et al 23 The trend of heat transfer in the thickness direction both in the fire side and the insulator side was significantly apparent, and the temperature gradient of the insulator side was lower than the fire side. The temperature of the fin was higher than the pipe wall; the maximum temperature distinction was about 21 K in general result from the convective heat transfer between the flowing stream in the tube and the bundle, which might carry away thermal energy inside the tube wall and cause temperature decreasing in the tube wall.…”

Section: Resultssupporting

confidence: 67%

“…21 Abundant achievements of boiler water wall were attained on the field about heat transfer and statics performance currently. Zima et al 22 and Dong et al 23 proposed a mathematical model respectively for investigating temperature distribution of supercritical boiler water wall. They deemed that the heat flux of the furnace was an important parameter for water wall thermal properties.…”

Section: Introductionmentioning

confidence: 99%

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A thermal stress analysis of fluid–structure interaction applied to boiler water wall

Zhang

Yang

Nie³

et al. 2020

Asia-Pacific J Chem Eng

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Fluid-structure interaction (FSI), the combination of computational fluid dynamics and computational solid mechanics, is considered as a procedure to determine the stress or strain of the solid under the influence of flow movement. Common parameters such as pressure and temperature that existed in the fluid solver and solid solver are the core factors of date communication in FSI. This work investigated the thermal stress and deformation distribution of the vapor segment of the water wall by numerical simulation under two typical conditions of the 660-MW boiler. The ideal condition and the case with the oxide scale inside were compared to realize the peculiarity of parameter distribution. The results revealed that the peak temperature of water wall was

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Section: Resultssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 99%

A thermal stress analysis of fluid–structure interaction applied to boiler water wall

Zhang

Yang

Nie³

et al. 2020

Asia-Pacific J Chem Eng

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“…And the double‐reheat steam circuit makes heat transfer more complicated. Dong et al 30 found that the maximal heat flux of the primary combustion zone was close to 500 kW m −2 of the double‐reheat boiler, which was higher than that in the conventional single‐reheat USC boilers 31 . It is necessary to study the heat flux distribution of the double‐reheat boiler.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Deng

Zhang

et al. 2021

Asia-Pacific J Chem Eng

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Ultra‐supercritical double‐reheat technology, as one of the most advanced coal‐fired power generation technology, is an important direction for emission reduction and energy saving in the world. In this study, the numerical calculation was executed in a 660‐MW ultra‐supercritical double‐reheat tower‐type boiler under deep‐air‐staging conditions. The refined HCN oxidation model was adopted to substitute the default model implemented by the user‐defined functions to calculate the NOx emission. The influences of the boiler load, over‐fire air (OFA) ratio, and excess air coefficient on temperature, species, and heat flux distributions were investigated. Results show that the decrement of the boiler load from boiler maximum continuous rating to 50% turbine heat acceptance gives rise to an increase of NOx emission. The heat flux distributions along with the furnace width direction present bell shaped. When the OFA ratio rises from 17% to 43%, NOx emission descends from 357.7 to 179.3 mg m−3 at the furnace outlet, and the heat flux distributions become more uniform along with the furnace width direction with lower peaks. Temperatures, species, and heat flux distributions are similar under the three different excess air coefficients. The NOx emission is the lowest when the excess air coefficient is 1.15. The results could provide a reference for combustion characteristics optimization and hydrodynamic calculation of ultra‐supercritical double‐reheat tower‐type boiler.

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“…Aerodynamic processes and heat exchange in the furnace of a steam boiler with a secondary emitter were considered in the study [9,10]. Water-fired boilers, which are common in industrial and municipal boilers, are used for the analysis and are used as sources of heat and steam supply.…”

Section: Literature Reviewmentioning

confidence: 99%

Energy Characteristics of Medium Pressure Steam Boilers

Bezhan

Zhytarenko

Dalakov³

2020

JES

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The object of this study is the thermal and energy characteristics of medium pressure boilers of СНPP-1, four boilers CKTI-75/39F-2-4 and two boilers TP-150-2. All boilers operate on a common steam collector of 32 atm, at 420 °С. Fuel is a mixture of blast furnace gas and natural gas in the ratio of 0.7-0.9 volume particles. The characteristics of the blast furnace gas are not constant: the elemental composition, humidity, and dustiness of blast furnace gas change significantly. Analysis of operation of CHPP-1 medium pressure boilers of OJSC “Mariupol Metallurgical Combinat named after P. G. Ilyich” was carried out on the basis of the technical documentation and materials obtained during the ecological and thermal-technical tests of the boilers CKTI-75/39F-2-4 No. 7–9, and TP-150 No. 11, 12 of SU “Promavtomatika”. The main purpose of the analysis is to identify patterns that affect the operational characteristics of boilers, especially the efficiency. The analysis revealed the nature of the overall dependence of the efficiency on the load, as well as the dependence of the efficiency of the boilers on the load at different thermal parts of the blast furnace gas. After carrying out the balance tests, the dependencies of the exhaust gas temperature on the boiler load at different thermal parts of the blast furnace gas were established. Keywords: medium pressure boiler, thermal efficiency, blast furnace gas, heat losses.

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Coupled Heat Transfer Simulation of the Spiral Water Wall in a Double Reheat Ultra-supercritical Boiler

Cited by 16 publications

References 26 publications

A thermal stress analysis of fluid–structure interaction applied to boiler water wall

A thermal stress analysis of fluid–structure interaction applied to boiler water wall

Numerical study on combustion characteristics and heat flux distributions of 660‐MW ultra‐supercritical double‐reheat tower‐type boiler

Energy Characteristics of Medium Pressure Steam Boilers

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