Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler

Lyu, Junfu; Yang, Hairui; Liu, Wen; Nie, Linru; Yue, Guangxin; Li, Ruixin; Chen, Ying; Wang, Shilong

doi:10.1007/s11708-017-0512-4

Cited by 41 publications

(17 citation statements)

References 4 publications

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“…The success of the Baima SCCFB boiler encouraged the development of the UCCFB boiler [47]. The Ministry of Science and Technology of China has provided support to design and demonstrate the 660 MW UCCFB boiler during China's 13th Five-Year Plan.…”

Section: Mw Usccfb Boilermentioning

confidence: 99%

Progress of circulating fluidized bed combustion technology in China: a review

Cai

Lyu

et al. 2017

Clean Energy

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Circulating fluidized bed (CFB) technology plays an important role in the utilization of low-grade coal in China. This article reviews CFB combustion technology development in China and summarizes recent achievements. Since 1990 Chinese engineers and researchers have been undertaking work to improve CFB boiler technology. A completely novel CFB boiler design theory was developed and used in the domestic manufacturing of CFB boilers with various capacities. China is the largest supplier and customer of CFB boilers in the world due to the widespread use of CFB boilers. In 2007, the lower energy consumption CFB technology was successfully developed by re-specifying the fluidization state, which reduced the power consumption of forced fans and solved the potential erosion problems on the water wall. Afterwards, in order to increase the electric power generation efficiency, the supercritical CFB (SCCFB) boiler was developed and the first 600 MW SCCFB boiler was demonstrated and put into commercial operation in 2013. The success of the technology is evident with over 80 SCCFB boilers on order with capacities of 350 MW to 660 MW. Chinese scientists and engineers are also developing technology to lower the emissions of CFB combustion to meet the requirements of China's strict emission regulations. This emission reduction is through high-efficiency desulfurization by limestone injection into the furnace and low NO x combustion, ultra-low emission of SO 2 and NO x in the furnace can be realized by improving the bed quality and increasing the solid circulation rate. There is currently further research and design development being undertaken to develop a 660 MW ultra-supercritical CFB (USCCFB) boiler. The new boiler is expected to be operational before 2020 resulting in higher efficiency and lower energy consumption and emissions.

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Section: Mw Usccfb Boilermentioning

confidence: 99%

Progress of circulating fluidized bed combustion technology in China: a review

Cai

Lyu

et al. 2017

Clean Energy

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“…It is a highly efficient technology (Grace et al, 1997;Oka, 2003;Lockwood, 2013) and is suitable to combust solid fuels with very different mechanical, physical, and chemical properties (Walter and Epple, 2017;. It can be used both on a small scale (Yates and Lettieri, 2016) for decentralized solutions and on a centralized level with an electrical power of up to 600 MW el (Jäntti et al, 2012;Lyu et al, 2019). CFB co-combustion of several fuels can reduce operating costs by responding to regional and seasonal fuel availability and has a large potential for CO 2 emission reduction at low costs (Sami et al, 2001;Hansson et al, 2009;Werther, 2009;Al-Mansour and Zuwala, 2010).…”

Section: Introductionmentioning

confidence: 99%

Acceleration of Load Changes by Controlling the Operating Parameters in CFB Co-Combustion

et al. 2021

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The integration of intermittent renewable energy sources into the electricity market requires flexible and efficient technologies that compensate for the fluctuating electricity demand. A circulating fluidized bed (CFB) boiler is a suitable solution due to its fuel flexibility, but the thermal inertia of the fluidized bed can have negative effects on the load following capabilities. This study investigates the influence of the operating parameters of the fire side on the speed of load changes on the waterside. Co-combustion of lignite, straw, and refuse derived fuel (RDF) was carried out. In a 1 MWth pilot CFB combustor fifteen load changes were performed with a varying step input of the primary air, the secondary air, and the fuel mass flow. The step input of the primary air had a large influence on the load ramps, as it strongly affects the solids concentration in the upper furnace. The step size of the fuel mass flow had a positive effect on the load change rate. Based on the results, concepts were developed to accelerate load ramping by controlling the hydrodynamic conditions and the temperature on the fireside.

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“…Circulating Fluidized Bed (CFB) power generation technology is one of the clean coal power generation technologies developed in the past 30 years [1]. This technology offers wide fuel adaptability, high combustion efficiency, high efficiency desulfurization, low nitrogen oxide emissions, a wide range of load regulation, and other superior performances [2,3]. CFB technology has paved the way for the large-scale utilization of inferior coal and coal washing wastes [4].…”

Section: Introductionmentioning

confidence: 99%

Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method

Shen

Wang

et al. 2020

Energies

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When the load of Circulating Fluidized Bed (CFB) boiler changes dynamically, the accumulation and consumption of residual char causes a large inertia and hysteresis in the boiler combustion system. Therefore, accurate estimation of the residual char in the boiler is of great significance to the control system and improve the combustion efficiency. Based on the Computational Particles Fluid Dynamics (CPFD) method, a numerical simulation of the variable load process of CFB boiler was carried out, and the dynamic changes of the residual char inventory were analyzed by combining the coal feed, ash discharge, and furnace calorific value. The results showed that after CFB boiler reached stable operation, the residual char fluctuated from 11,000 kg to 16,000 kg, accounting for about 3.7% of the total bed material, and the residual char was in a dynamic balance. During the load-up phase, the average residual char was 17,500 kg, and during the load-down phase, the average residual char was 15,000 kg. In the process of load dynamic change, reasonable residual char stock can ensure the boiler load from one steady state to another steady state rapid transition.

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Development of a supercritical and an ultra-supercritical circulating fluidized bed boiler

Cited by 41 publications

References 4 publications

Progress of circulating fluidized bed combustion technology in China: a review

Progress of circulating fluidized bed combustion technology in China: a review

Acceleration of Load Changes by Controlling the Operating Parameters in CFB Co-Combustion

Study on Dynamic Characteristics of Residual Char of CFB Boiler Based on CPFD Method

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