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

Abstract

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

Numerical Simulation of the Integral Thermal Deformation Behavior of a Radiant Syngas Cooler for an Entrained-Flow Gasifier

“…The inlet temperature distinctly affects the equivalent stress at zone A. Increasing the inlet temperature leads to the nonuniformity distribution of the equivalent stress at zone A on the membrane wall surface, which results in stress concentration like a spindle, similar to the temperature distribution . Equivalent stress increases significantly as the inlet temperature increases.…”

“…Increasing the inlet temperature leads to the nonuniformity distribution of the equivalent stress at zone A on the membrane wall surface, which results in stress concentration like a spindle, similar to the temperature distribution. 14 Equivalent stress increases significantly as the inlet temperature increases. The maximum equivalent stress at zone A is 114 MPa at 1773 K, which is close to the allowable stress of the material.…”

“…The high-temperature syngas and ash particles generated in the gasification chamber flow into the RSC directly, resulting in a harsh operating environment in the RSC that makes it difficult to carry out high-temperature experiments directly. Therefore, the physical processes in the RSC are researched by numerical simulations. − Uebel et al compared different heat recovery systems through thermodynamic analysis and technology evaluation, finding that the combination of the RSC and full water quench was deemed to have the highest total efficiency. Xiong et al used CFD software to establish a model of ash deposition coupled with heat transfer to analyze the characteristics of ash deposition in the RSC, which concluded that an increase in the width of the radiation screen and the inlet temperature leads to the malignant growth of deposition.…”