Investigation on the ash deposition of a radiant syngas cooler using critical velocity model

Zhang, Pengfei; Xu, Chengzhang; Jian-ping, Kuang; Liu, Shuigang; Xia, Zhihong; Wu, Ke; Huang, Yuqi

doi:10.1016/j.egyr.2020.04.015

Cited by 14 publications

(6 citation statements)

References 27 publications

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“…Botros and Brisson even tried to use a new coolant instead of water. In addition, some researchers, such as Ni et al, , Li et al, and Zhang et al, have studied the RSC device with two cylindrical shells, which is very different from the model used in this work. Besides, the details of the materials have not been given in most literature.…”

Section: Resultsmentioning

confidence: 94%

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: Resultsmentioning

confidence: 94%

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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show abstract

“…This phenomenon of the existence of a high‐temperature zone in the middle‐upper part was also reported in the literature. [ 49 ] The maximum temperature difference of the circumferential membrane wall reaches 305 K. With the increase of the operating load, the core area of the jet flow gradually extends. The high‐temperature area of the circumferential membrane wall moves down and gradually stabilizes at the place about 6.5 m from the top.…”

Section: Resultsmentioning

confidence: 99%

“…A large number of ash and slag particles are carried in the high‐temperature syngas. [ 49 ] The high‐temperature liquid slag enters the RSC along the interface wall, then breaks into different sizes of slag droplets under the action of shear force and gravity. [ 51 ] Fly ash particles and molten slag droplets may collide with the water wall surface of the RSC under the action of gas flow, and some particles accumulate on the water wall surface to form a surface deposition layer, which hinders the heat transfer between the water wall and the syngas.…”

Section: Resultsmentioning

confidence: 99%

Performance evolution of industrial radiant syngas cooler with radiation screens using numerical simulation

Wang

Qiu

et al. 2022

Can J Chem Eng

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Radiant syngas cooler (RSC) is an important piece of equipment for heat recovery and steam generation in the gasification plant. In this work, the industrial RSC model of an opposed multi-burner coal-water-slurry gasification device is established, and the heat recovery performance of RSC is studied by numerical simulation method. The simulation result of the total heat transfer rate is compared with the industrial operation data. The effect of different operating parameters on RSC is further studied, including the operating load, inlet syngas temperature, and ash deposition thickness. The results show that there is a spindle-shaped high-temperature zone on the circumferential membrane wall surface with a distance of 6.5 m from the top under the basic operating conditions. There is also an obvious high-temperature zone in the mid-upper section

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“…Ai et al [6] adopted the critical velocity to determine the mass flow of particles deposited on steam turbines. Zhang et al [7] combined these two methods and established a prediction model for fouling and slagging in RSC. When the temperature exceeds the temperature corresponding to the critical viscosity, all particles are assumed to adhere.…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of the Deposition Characteristics in the Initial Deposition Stage in RSC

Zhang

Yang

Zhang

et al. 2023

J. Phys.: Conf. Ser.

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The coal gasification syngas cooler is important for recovering the sensible heat generated during coal gasification. The ash layer formed on the heat transfer surface can seriously decrease the heat exchange efficiency. Establishing the initial layer is a prerequisite for massive ash deposition and will accelerate the accumulation of the ash and slag particles. In this study, numerical simulations are conducted to analyze the behavior of ash particles in large-scale industrial equipment. The deposition characteristics during the initial fouling and slagging stage in RSC are explored. The results show that in this stage, ash or slag particles mainly stick on the side wall, and only small particles deposit on the upper cone. The surface energy is the dominant factor influencing the composition of the initial layer. The adhesion ratio of FeS2 and ZnS particles is over ten times higher than that of SiO2 particles. With the decrease of the inlet flow rate and the increase of the inlet swirl velocity, the location corresponding to the maximum deposition proportion moves upward, and the local maximum deposition proportion increases.

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Investigation on the ash deposition of a radiant syngas cooler using critical velocity model

Cited by 14 publications

References 27 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

Performance evolution of industrial radiant syngas cooler with radiation screens using numerical simulation

Numerical Analysis of the Deposition Characteristics in the Initial Deposition Stage in RSC

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