Emission Characteristic of NOx in CFB Boiler at Low Load

2021 ◽  
pp. 489-498
Author(s):  
Lujian Chen ◽  
Xin Tao ◽  
Shouyu Zhang ◽  
Hairui Yang ◽  
Junfu Lyu
Keyword(s):  
Emission Characteristic ◽  
Cfb Boiler ◽  
Low Load

Realization and performance evaluation for long-term low-load operation of a CFB boiler unit

Energy ◽  
2021 ◽  
Vol 214 ◽  
pp. 118877
Author(s):  
Feng Hong ◽  
Jiyu Chen ◽  
Rui Wang ◽  
Dongteng Long ◽  
Haoyang Yu ◽  
...  
Keyword(s):  
Performance Evaluation ◽  
Boiler Unit ◽  
Cfb Boiler ◽  
Low Load ◽  
And Performance

Application of the Wind-Water Combined Slag Coolers in CFB Boilers

2012 ◽  
Vol 516-517 ◽  
pp. 568-571
Author(s):  
Zhi Gang Li ◽  
Jin Li Chen ◽  
Jing Ji Li
Keyword(s):  
Heat Recovery ◽  
Power Plants ◽  
Circulating Fluidized Bed ◽  
Recovery Efficiency ◽  
Cfb Boiler ◽  
Low Load ◽  
Inlet Tube ◽  
Integral Structure ◽  
The Stability ◽  
Financial Losses

At present, there have been a lot of accidents happened in the wind-water combined slag coolers of the Circulating Fluidized Bed (CFB) boiler power plants, which usually caused the low-load or even stop of the units along with great financial losses. Comprehensively considering the actual conditions of the domestic CFB boiler power plants, the theoretical analysis and thermodynamic calculation were conducted aiming to solve the specific problems found in the operation. There were new designs and retrofitting measures in the integral structure and some key components, such as the slag inlet-tube. The operation effect of the slag coolers, i.e. the stability and heat-recovery efficiency etc., were significantly improved by retrofitting the devices.

The Combusting Properties of Anthracite in a 410 t/h CFB Boiler

2004 ◽  
Vol 126 (3) ◽  
pp. 226-230 ◽  
Author(s):  
Xiaofeng Lu ◽  
Ryo S. Amano
Keyword(s):  
Fly Ash ◽  
Carbon Content ◽  
Cfb Boiler ◽  
Low Load ◽  
Boiler Operation ◽  
Operation Test

According to the results of an optimized operation test carried out on a 410 t/h CFB boiler, the measured combusting properties of anthracite in the large CFB boiler are provided in this paper. These properties include: operating and designing parameters affected on the carbon content in fly ash, distribution of oxygen in the furnace, distribution of temperature in the furnace, distribution of bed pressure, and operation under low load. Some methods used to improve the CFB boiler operation are discussed in the paper.

Pilot-scale combustion studies with kraft lignin in a powder burner and a CFB boiler

TAPPI Journal ◽  
2010 ◽  
Vol 9 (6) ◽  
pp. 24-30 ◽  
Author(s):  
NIKLAS BERGLIN ◽  
PER TOMANI ◽  
HASSAN SALMAN ◽  
SOLVIE HERSTAD SVÄRD ◽  
LARS-ERIK ÅMAND
Keyword(s):  
Circulating Fluidized Bed ◽  
Black Liquor ◽  
Chloride Content ◽  
Pilot Scale ◽  
High Energy ◽  
Kraft Lignin ◽  
High Energy Density ◽  
Alkali Chloride ◽  
Cfb Boiler ◽  
Solid Biofuel

Processes have been developed to produce a solid biofuel with high energy density and low ash content from kraft lignin precipitated from black liquor. Pilot-scale tests of the lignin biofuel were carried out with a 150 kW powder burner and a 12 MW circulating fluidized bed (CFB) boiler. Lignin powder could be fired in a powder burner with good combustion performance after some trimming of the air flows to reduce swirl. Lignin dried to 10% moisture content was easy to feed smoothly and had less bridging tendencies in the feeding system than did wood/bark powder. In the CFB boiler, lignin was easily handled and cofired together with bark. Although the filter cake was broken into smaller pieces and fines, the combustion was not disturbed. When cofiring lignin with bark, the sulfur emission increased compared with bark firing only, but most of the sulfur was captured by calcium in the bark ash. Conventional sulfur capture also occurred with addition of limestone to the bed. The sulfur content in the lignin had a significantly positive effect on reducing the alkali chloride content in the deposits, thus reducing the high temperature corrosion risk.

Analysis of LPG diffusion flame in tube type burner

2019 ◽  
Vol 13 (3) ◽  
pp. 5278-5293
Author(s):  
Vipul Patel ◽  
Rupesh Shah
Keyword(s):  
Diffusion Flame ◽  
Emission Characteristic ◽  
Flame Stability ◽  
Liquefied Petroleum Gas ◽  
Air Velocity ◽  
Length Fraction ◽  
Low Emission ◽  
Tube Type ◽  
Stability Limits ◽  
Co Emission

The present research aims to analyse diffusion flame in a tube type burner with Liquefied petroleum gas (LPG) as a fuel. An experimental investigation is performed to study flame appearance, flame stability, Soot free length fraction (SFLF) and CO emission of LPG diffusion flame. Effects of varying air and fuel velocities are analysed to understand the physical process involved in combustion. SFLF is measured to estimate the reduction of soot. Stability limits of the diffusion flame are characterized by the blowoff velocity. Emission characteristic in terms of CO level is measured at different equivalence ratios. Experimental results show that the air and fuel velocity strongly influences the appearance of LPG diffusion flame. At a constant fuel velocity, blue zone increases and the luminous zone decreases with the increase in air velocity. It is observed that the SFLF increases with increasing air velocity at a constant fuel velocity. It is observed that the blowoff velocity of the diffusion flame increases as fuel velocity increases. Comparison of emission for flame with and without swirl indicates that swirl results in low emission of CO and higher flame stability. Swirler with 45° vanes achieved the lowest CO emission of 30 ppm at Φ = 1.3.

THE WORK OF AN ACTIVE CURRENT CORRECTOR AT LOW LOAD POWER EXAMINATION

2017 ◽  
Vol 2017 (46) ◽  
pp. 81-84
Author(s):  
V.M. Spirin ◽  
◽  
V.M. Gubarevych ◽  
V.G. Grebenyuk ◽  
S.V. Salko ◽  
...  
Keyword(s):  
Load Power ◽  
Low Load

scholarly journals Investigation of Ash Deposition Dynamic Process in an Industrial Biomass CFB Boiler Burning High-Alkali and Low-Chlorine Fuel

Energies ◽  
2020 ◽  
Vol 13 (5) ◽  
pp. 1092
Author(s):  
Hengli Zhang ◽  
Chunjiang Yu ◽  
Zhongyang Luo ◽  
Yu’an Li
Keyword(s):  
Gas Flow ◽  
Circulating Fluidized Bed ◽  
Deposition Process ◽  
Biomass Combustion ◽  
Ash Deposition ◽  
Biomass Ash ◽  
Cfb Boiler ◽  
Third Stage ◽  
Ash Deposit ◽  
High Alkali

The circulating fluidized bed (CFB) boiler is a mainstream technology of biomass combustion generation in China. The high flue gas flow rate and relatively low combustion temperature of CFB make the deposition process different from that of a grate furnace. The dynamic deposition process of biomass ash needs further research, especially in industrial CFB boilers. In this study, a temperature-controlled ash deposit probe was used to sample the deposits in a 12 MW CFB boiler. Through the analysis of multiple deposit samples with different deposition times, the changes in micromorphology and chemical composition of the deposits in each deposition stage can be observed more distinctively. The initial deposits mainly consist of particles smaller than 2 μm, caused by thermophoretic deposition. The second stage is the condensation of alkali metal. Different from the condensation of KCl reported by most previous literatures, KOH is found in deposits in place of KCl. Then, it reacts with SO2, O2 and H2O to form K2SO4. In the third stage, the higher outer layer temperature of deposits reduces the condensation rate of KOH significantly. Meanwhile, the rougher surface of deposits allowed more calcium salts in fly ash to deposit through inertial impact. Thus, the elemental composition of deposits surface shows an overall trend of K decreasing and Ca increasing.

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