scholarly journals Comparative Techno-Economic and Exergetic Analysis of Circulating and Dual Bed Biomass Gasification Systems

2021 ◽  
Vol 3 ◽  
Author(s):  
Pablo Silva Ortiz ◽  
Simon Maier ◽  
Ralph-Uwe Dietrich ◽  
Adriano Pinto Mariano ◽  
Rubens Maciel Filho ◽  
...  
Keyword(s):  
Power Generation ◽  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Industrial Sector ◽  
Combined Cycle ◽  
Production Costs ◽  
Total Production ◽  
Syngas Conversion ◽  
Dual Fluidized Bed ◽  
Dual Bed

In this work, the techno-economic and exergy analyses of two gasification technologies with integration into heat and power combined cycles are presented: i). Circulating fluidized bed (CFB) and ii). Dual fluidized bed (DFB) systems. As feedstock, lignocellulosic biomass (sugarcane bagasse, SCB) was considered. The gasification process of the fluidized-bed systems (circulating and dual bed) and the syngas conversion were performed using Aspen Plus® software. The process design includes biomass drying and gasification, syngas cleaning, combustion, power generation, and heat recovery. The SCB-DFB system has the lowest irreversibility rate and, as a result, the highest overall performance and power generation (achieving 32% in the gasification system and 53% of exergy efficiency when coupled with the combined cycle). From the techno-economic assessment, the SCB-DFB system has the lowest total production costs per unit of energy. Hence, the dual fluidized bed systems could be a more competitive technology for the agro-industrial sector to generate power from lignocellulosic materials.

Performance evaluation of a supercritical circulating fluidized bed boiler for power generation under flexible operation

2021 ◽  
pp. 095765092199396
Author(s):  
Matteo Bruzzone ◽  
Silvia Ravelli
Keyword(s):  
Power Generation ◽  
Fluidized Bed ◽  
High Performance ◽  
Circulating Fluidized Bed ◽  
Thermal Power ◽  
Rankine Cycle ◽  
Hard Coal ◽  
Cfb Boiler ◽  
Power Cycles ◽  
Commercial Code

It is well known that the Łagisza power plant in Poland is the world’s first supercritical circulating fluidized bed (CFB) boiler, whose commercial operation started on June 2009. It has attracted a great deal of interest and operational data are publicly available, therefore it has been chosen as the object of the present study aimed at assessing load and fuel flexibility of supercritical CFB plants. First, the thermal cycle was modelled, by means of the commercial code Thermoflex®, at nominal and part load conditions for validation purposes. After having verified the validity of the applied modelling and simulation tool, the advantage of having supercritical steam combined with CFB boiler over subcritical steam and pulverized coal (PC) boiler, respectively, was quantified in terms of electric efficiency. As a next step, the designed fuel, i.e. locally mined hard coal, was replaced with biomass: 100% biomass firing was taken into account in the case of subcritical CFB boiler whereas the maximum share of biomass with coal was set at 50% with supercritical CFB boiler, consistently with the guidelines provided by the world leading manufacturers of CFB units. A broad range of biomass types was tested to conceive mixtures of fuel capable of preserving quite high performance, despite the energy consumption in pretreatment. However, the overall efficiency penalty, due to biomass co-firing, was found to potentially undermine the benefit of supercritical steam conditions compared to conventional subcritical power cycles. Indeed, the use of low-quality biomass in thermal power generation based on steam Rankine cycle may frustrate efforts to push the steam cycle boundaries.

scholarly journals Second Round of Studies on Advanced Power Generation Based on Combined Cycle Using a Single High-Pressure Fluidized Bed Boiler and Consuming Biomass

2012 ◽  
Vol 6 (1) ◽  
pp. 41-47 ◽  
Author(s):  
Marcio L. de Souza-Santos ◽  
Juan Villanueva Chavez
Keyword(s):  
Power Generation ◽  
Fluidized Bed ◽  
Flue Gas ◽  
Gas Turbines ◽  
Sugar Cane Bagasse ◽  
Combined Cycle ◽  
Present Stage ◽  
Added Water ◽  
Preliminary Study ◽  
Process Simulator

Following a preliminary study of power generation processes consuming sugar-cane bagasse; this second round indicates the possibility of almost doubling the current efficiency presently obtained in conventional mills. A combined cycle uses highly pressurized fluidized bed boiler to provide steam above critical temperature to drive steam-turbine cycle while the flue-gas is injected into gas turbines. The present round also shows that gains over usual BIG/GT (Biomass In-tegrated Gasification/Gas Turbine) are very likely mainly due to the practicality of feeding the biomass as slurry that can be pumped into the pressurized boiler chamber. Such would avoid the cumbersome cascade feeding of the fibrous bio-mass, usually required by other processes. The present stage assumes slurry with 50% added water. Future works will concentrate on thicker slurries, if those could be achieved. All studies apply a comprehensive simulator for boilers and gasifiers [CSFMB™ or CeSFaMB™] and a process simulator (IPES) to predict the main features of the steam and gas tur-bine branches.

Advanced Power Generation System and Related Thermal Engineering Problems

2011 ◽  
Author(s):  
Mamoru Ozawa ◽  
Ryosuke Matsumoto ◽  
Hisashi Umekawa
Keyword(s):  
Power Generation ◽  
Fluidized Bed ◽  
Combined Cycle ◽  
Thermal Engineering ◽  
Integrated Gasification Combined Cycle ◽  
Gasification Process ◽  
Coal Technology ◽  
The Government ◽  
Integrated Gasification ◽  
Typical Component

Based on the increased attention to “energy security” and “sustainable development”, it is essential to promote clean use of coal as a fuel. Typical advanced technologies are demonstrated by the pressurized fluidized-bed combined cycle (PFBC) and integrated gasification combined cycle (IGCC). Focusing mainly on these two examples as the advanced energy conversion technology, related problems are reviewed. The PFBC technology is a composite technology of conventional fluidized bed and combined-cycle, in which ash, being a typical component of coal, is not melted but is removed mainly in the fluidized bed. On the other hand, the IGCC is much more complicated and ash removal is conducted by melting in the combustor. Heat released there is utilized for gasification process in the reductor installed just downstream the combustor. Even though both systems have very high potential for clean and efficient use of coal, the commercial plants are limited in a very small number or at the stage of just a demonstration plant. To extend and develop clean-coal technology in the electric power generation market, a strategy of the government on the energy technology as well as the long-term competition in the market are indispensable, otherwise related technologies as well as the engineers involved will be lost.

Dust Removal Concepts for Pressurized Fluidized Bed Systems

1982 ◽  
Author(s):  
R. R. Boericke ◽  
W. E. Moore
Keyword(s):  
Power Generation ◽  
High Temperature ◽  
Fluidized Bed ◽  
Combined Cycle ◽  
Dust Removal ◽  
Granular Bed ◽  
Bag Filter ◽  
Development Status ◽  
Reference Plant ◽  
System Designs

Improved high-temperature (1700°F, 925°C) dust removal concepts are being developed for pressurized fluidized bed combined cycle power generation. Recent results on cyclones, electrocyclones, an acoustic agglomerator, a ceramic bag filter, and an electrostatic granular bed filter are reviewed. The development status of each device is described, and the relative merits of each concept are discussed. System designs for employing each of the dust removal concepts in a 650 MWe PFB reference plant are presented in order to illustrate the application of the devices, and approximate economic comparisons are made for this application.

An Experiment on Solid Circulation Characteristics of a Dual Circulating fluidized Bed Based on Biomaterial Properties and Mechanics Properties

2012 ◽  
Vol 600 ◽  
pp. 261-264
Author(s):  
Teng Ge Mi ◽  
Ying Zhao ◽  
Chang Qing Dong ◽  
Wei Liang Cheng
Keyword(s):  
Fluidized Bed ◽  
Circulating Fluidized Bed ◽  
Circulation Rate ◽  
Gas Velocity ◽  
Solid Circulation Rate ◽  
Dual Fluidized Bed ◽  
Bed Material ◽  
Circulation Characteristics

In this paper, a dual fluidized bed has been established. The effect of bed material build-up height and gas velocity on the solid circulation rate of CFB (circulating fluidized bed) and BFB (bubble fluidized bed) has been studied. The results show that the solid circulation rate is increased with the increasing of gas velocity Uc and the bed material build-up height. Bed material build-up height of BFB and CFB is changed with the changing of gas velocity Uc. The bed material heights of CFB and BFB have been also investigated in this experiment.

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