Flow and heat transfer characteristics in the syngas quench system of a 300 MWe IGCC process

Ye, Insoo; Park, Sangbin; Ryu, Changkook; Park, Sung Ku

doi:10.1016/j.applthermaleng.2013.04.006

Cited by 17 publications

(6 citation statements)

References 17 publications

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“…After the mass transfer of syngas and quenched water, a large amount of water is evaporated into water vapor and enters into syngas, which results in the increase of the hydrogen content in gas, and then leads to the workload reduction of the subsequent water–gas shift reaction . In the gas quenching system, the heat transfer and gas temperature trend can be effectively predicted by considering three kinds of gas flow (hot, cold, and mixed syngas) . For biomass gasification plant, the quenching chamber can also be equipped with an adsorption device to solve the problem of tar removal …”

Section: Introductionmentioning

confidence: 99%

“…13 In the gas quenching system, the heat transfer and gas temperature trend can be effectively predicted by considering three kinds of gas flow (hot, cold, and mixed syngas). 14 For biomass gasification plant, the quenching chamber can also be equipped with an adsorption device to solve the problem of tar removal. 15 The main heat recovery equipments for a waste heat boiler process are a radiant syngas cooler (RSC) and a convective syngas cooler (CSC).…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulation of Heat Transfer and a Forging Plate Structure in a Radiant Syngas Cooler with Radiation Screens

Qiu

Guo

Wei

et al. 2020

Ind. Eng. Chem. Res.

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High-temperature syngas is produced by entrained-flow coal gasification. A traditional quenching process has the drawback of low heat recovery efficiency, and the cleaning of convective syngas cooler is a big problem. Thus, the combination of a radiant syngas cooler and a quench chamber is a more promising way for heat recovery and syngas preliminary purification. In this study, based on the traditional radiant syngas cooler, sixteen radiation screens are added to increase the heat exchange area, so as to further improve heat recovery efficiency of the radiant syngas cooler. Heat transfer and structure analysis of a forging plate on the top of the radiation screen are carried out by numerical simulation. The radiation screen changes the internal spatial structure of the radiant syngas cooler, which also affects the heat transfer characteristics of the membrane wall. The circumferential temperature distribution of the cylinder membrane wall is not uniform, and the temperature is the highest at the central pipe. The surface heat flux of the cooling pipes on the radiation screen reaches the maximum value at the position with a distance of about 6 m from the top. The slag and fly ash carried in the gas flow deposit on the wall surface and form deposition layers, which protects the forging plate and cooling pipes, but reduces the heat transfer efficiency.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Heat Transfer and a Forging Plate Structure in a Radiant Syngas Cooler with Radiation Screens

Qiu

Guo

Wei

et al. 2020

Ind. Eng. Chem. Res.

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“…The excess energy, in the product gas stream, is removed in the reactor quench probe, which is designed to reduce the gas temperature by means of injected water sprays. Water-cooled quenching systems are the most commonly used, although chemical quenching remains another alternative [4], [5]. The quench probe is specifically designed to rapidly decrease the gas temperature with typical cooling rates exceeding 10 6 °C/s [6], [7].…”

Section: Introductionmentioning

confidence: 99%

CFD Modelling of the Temperature Profile in a Plasma-arc Furnace Reactor Quench Probe

2016

International Conference on Advances in Science, Engineering, Technology and Natural Resources (ICASETNR-16) Nov. 24-25, 2016 P

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Abstract-Plasma gasification is the thermal decomposition process which utilises extreme temperatures to eliminate waste materials and produce a syngas product. The purpose of the quench probe is to withdraw the excess energy from a mixture of unstable gaseous species and is an extremely important step in determining the composition of the syngas product. The South African Nuclear Energy Corporation (Necsa) is currently developing a laboratory scale plasma-arc furnace reactor of which the quench probe operation and performance is yet to be evaluated and optimised. This study focusses on modelling the temperature profile in the quench probe using Computational Fluid Dynamics (CFD) simulations. This study investigates the effect of the following variables: (i) the product gas flow rate (ii) the current supplied to the plasma-arc torch and (iii) the flow rate of the quenching water. During the experimental phase five temperature measurements were taken along the length of the quench probe, which were further used to validate the developed CFD model. The number of parcel streams used in the CFD model was investigated and the selection of 20 parcel streams resulted in the most accurate model, with a root-mean square value of 7.38 °C. The developed CFD model accurately predicted the temperature profile in the quench probe, with an average error of 7.00 %. The velocity profile obtained from the CFD model indicated the existence of a stagnant gas flow zone, which causes heat transfer to propagate towards the gas inlet. Both the modelled and experimental results indicate that only the first spray nozzle in the quench probe is used for gas cooling at the investigated low temperatures, while the latter nozzles serve no purpose. The temperatures measured by the second thermocouple deviated from the modelled results on a number of occasions and the operation of this measuring device should be further investigated.

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“…CFD analysis has been carried out by many researchers to understand gasification reactions [14][15][16][17][18][19][20][21][22][23]. Chen et al [14] performed CFD modeling of a 200-ton/day, two-stage, air-blown, entrained-bed gasifier (Mitsubishi Heavy Industry, Fukushima, Japan).…”

Section: Introductionmentioning

confidence: 99%

“…Seggiani [22] performed simulation for slag accumulation and flow on walls in a Prenflo coal gasifier using a slag building simplified model. Ye et al [23] investigated the detailed flow and heat transfer characteristics in the quench pipe and transfer duct of the Taean 300 MWe IGCC process using CFD. Turbulent mixing and heat transfer by the hot syngas and quench gas streams were analyzed.…”

Section: Introductionmentioning

confidence: 99%

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

2015

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Three-dimensional computational fluid dynamics (CFD) modeling of the gasification performance in a one-stage, entrained-bed coal gasifier (Shell Coal Gasification Process (SCGP) gasifier) was performed, for the first time. The parametric study used various O2/coal and steam/coal ratios, and the modeling used a commercial code, ANSYS FLUENT. CFD modeling was conducted by solving the steady-state Navier-Stokes and energy equations using the Eulerian-Lagrangian method. Gas-phase chemical reactions were solved with the Finite-Rate/Eddy-Dissipation Model. The CFD model was verified with actual operating data of Demkolec demo Integrated Gasification Combined Cycle (IGCC) facility in Netherlands that used Drayton coal. For Illinois #6 coal, the CFD model was compared with ASPEN Plus results reported in National Energy Technology Laboratory (NETL). For design coal used in the SCGP gasifier in Korea, carbon conversion efficiency, cold gas efficiency, temperature, and species mole fractions at the gasifier exit were calculated and the results were compared with those obtained by using ASPEN Plus-Kinetic. The optimal O2/coal and steam/coal ratios were 0.7 and 0.05, respectively, for the selected operating conditions.

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Flow and heat transfer characteristics in the syngas quench system of a 300 MWe IGCC process

Cited by 17 publications

References 17 publications

Numerical Simulation of Heat Transfer and a Forging Plate Structure in a Radiant Syngas Cooler with Radiation Screens

Numerical Simulation of Heat Transfer and a Forging Plate Structure in a Radiant Syngas Cooler with Radiation Screens

CFD Modelling of the Temperature Profile in a Plasma-arc Furnace Reactor Quench Probe

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

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