Pilot-trial and modeling of a new type of pressurized entrained-flow pulverized coal gasification technology

Dai, Zhenghua; Gong, Xinglong; Guo, Xiaolei; Liu, Haifeng; Wang, Fuchen; Yu, Zu-Guo

doi:10.1016/j.fuel.2007.12.005

Cited by 88 publications

(38 citation statements)

References 13 publications

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“…Along the progress of coal gasifier installation and commissioning in chemical, metallurgical and town gas production industry and based on the knowledge and operation experiences learned, several indigenous gasifier concepts have been conceived and scaled up to commercial scales. A summary of the performance comparison is given in Table 1, which lists operation performances of Chinese gasification technologies including East China University of Science and Technology's Opposed multi-nozzle (ECUST-OMB) [19,20] and the Hangtian Gasifier (HT-L) [20,21].…”

Section: Syngas Production From Coalmentioning

confidence: 99%

Recent development in converting coal to clean fuels in China

Yang

2015

Fuel

138

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Section: Syngas Production From Coalmentioning

confidence: 99%

Recent development in converting coal to clean fuels in China

Yang

2015

Fuel

138

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“…Oxygen/carbon ratio is an important operating condition along with steam/carbon ratio, carrier gas/solid ratio, and gasification pressure [78]. Dai et al [78] studied all four conditions using the pilot-scale coal entrained-flow gasification system.…”

Section: Slag Behavior With Oxygen/carbon Ratio and Unreacted Carbonmentioning

confidence: 99%

“…Dai et al [78] studied all four conditions using the pilot-scale coal entrained-flow gasification system. The oxygen/carbon ratio affected the gasification temperature, carbon conversion, and syngas composition (e.g., CO + H 2 content) [30,78,79]. The steam/carbon ratio and carrier gas/solid ratio should be adjusted simultaneously with oxygen/carbon ratio changes [78].…”

Section: Slag Behavior With Oxygen/carbon Ratio and Unreacted Carbonmentioning

confidence: 99%

“…The oxygen/carbon ratio affected the gasification temperature, carbon conversion, and syngas composition (e.g., CO + H 2 content) [30,78,79]. The steam/carbon ratio and carrier gas/solid ratio should be adjusted simultaneously with oxygen/carbon ratio changes [78]. As the oxygen/carbon ratio increases the gasification temperature and carbon conversion increase, resulting in less unburned carbon in ash and more ash depositing to the wall [79].…”

Section: Slag Behavior With Oxygen/carbon Ratio and Unreacted Carbonmentioning

confidence: 99%

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Slag Behavior in Gasifiers. Part I: Influence of Coal Properties and Gasification Conditions

2013

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Abstract:In the entrained-flow gasifiers used in integrated gasification combined cycle (IGCC) plants, the majority of mineral matter transforms to liquid slag on the wall of the gasifier and flows out the bottom. However, a small fraction of the mineral matter is entrained (as fly ash) with the raw syngas out of the gasifier to downstream processing. This molten/sticky fly ash could cause fouling of the syngas cooler. To improve gasification availability through better design and operation of the gasification process, a better understanding of slag behavior and the characteristics of the slagging process is needed. Char/ash properties, gas compositions in the gasifier, the gasifier wall structure, fluid dynamics, and plant operating conditions (mainly temperature and oxygen/carbon ratio) all affect slagging behavior. Because coal has varying ash content and composition, different operating conditions are required to maintain the slag flow and limit problems downstream. In Part I, we review the main types and the operating conditions of entrained-flow gasifiers and coal properties used in IGCC plants; we identify and discuss the key coal ash properties and the operating conditions impacting slag behavior; finally, we summarize the coal quality criteria and the operating conditions in entrained-flow gasifiers. In Part II, we discuss the constitutive modeling related to the rheological studies of slag flow.

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“…Thus, clean coal technology has been developed to reduce environmental problems. Pressurized entrained flow gasification [2][3][4][5] with advantages of high gasification temperature and pressure, large capacity, wide coal applicability, and high carbon conversion rate, has become a promising issue of clean coal technology. In the process of large-scale entrained flow gasification, pulverized coal must be conveyed under a pressure higher than that of the gasifier, and the pulverized coal entering the gasifier should carry as little inert gas as possible.…”

Section: Introductionmentioning

confidence: 99%

Conveying Characteristics of Pulverized Coal in a Top‐Discharge Blow Tank System

Chen

Liang

et al. 2013

Chem Eng & Technol

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Based on the experiments of pulverized coal pneumatic conveying using nitrogen as carrier, the influences of riser inlet height above the gas distribution plate, riser diameter, pulverized coal external moisture content, and supplemental gas flow rate on the conveying characteristics such as pulverized coal mass flow rate and solid-gas ratio were investigated in a laboratory-scale experimental setup of a top-discharge blow tank under atmospheric pressure. There exists an optimal riser inlet height for a given top-discharge blow tank. The supplemental gas is one of the critical factors affecting the conveying stability and continuity. A model for material mass flow rate prediction with errors ranging from -25 % to +15 % is presented.

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Pilot-trial and modeling of a new type of pressurized entrained-flow pulverized coal gasification technology

Cited by 88 publications

References 13 publications

Recent development in converting coal to clean fuels in China

Recent development in converting coal to clean fuels in China

Slag Behavior in Gasifiers. Part I: Influence of Coal Properties and Gasification Conditions

Conveying Characteristics of Pulverized Coal in a Top‐Discharge Blow Tank System

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