Effect of raw material, moisture and high-temperature tertiary air on a coal gasifier for cement precalciation

IF 7.2 2区 工程技术 Q1 CHEMISTRY, APPLIED
Zhang Leyu , Chen Qingqing , Wei Xiaolin , Cheng Heng , Li Sen
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引用次数: 0

Abstract

This paper proposes a new method of pulverized coal gasification using high-temperature tertiary air in a cement precalciner, in which an external hanging gasifier is added nearby. A full-scale model is established and simulated for the entrained flow gasifier. During the gasification process, the global reaction mechanism is used to model the release and reactions of volatiles from pulverized coal, and a particle surface reaction model is employed to calculate the fixed carbon content. The mechanism by which reducing gas reacts with NO is also considered. The results of the velocity, temperature, gas composition, NOx emissions, calorific value, volatile conversion ratio and char burnout ratio, are achieved in the simulation. The results show that the volatile conversion ratios were close to 100%, and the carbon conversion ratios ranged from 27.97% to 62.76% among all the tested conditions. The concentrations of NO at the outlet of the gasifier were 109, 98, 75, 91, 87, 76, and 90 mg/m3 separately in 7 conditions. These values are significantly lower than those of complete combustion. However, the addition of raw meal had the best temperature control effect, leading to a significant decrease in thermal NOx production and no side effects on the stability of the production line.

原料、水分和高温三级空气对水泥预分解用煤气化炉的影响
本文提出了一种在水泥预煅烧炉中使用高温三次风进行煤粉气化的新方法,其中在附近增加了一个外挂式气化炉。建立并模拟了内流式气化炉的全尺寸模型。在气化过程中,全局反应机制用于模拟煤粉中挥发物的释放和反应,颗粒表面反应模型用于计算固定碳含量。还考虑了还原气体与 NO 的反应机理。模拟结果包括速度、温度、气体成分、NO 排放量、热值、挥发转化率和烧焦率。结果表明,在所有测试条件下,挥发转化率接近 100%,碳转化率在 27.97% 至 62.76% 之间。在 7 种条件下,气化炉出口处的 NO 浓度分别为 109、98、75、91、87、76 和 90 mg/m。这些数值明显低于完全燃烧时的数值。不过,添加生料的温度控制效果最好,导致热氮氧化物产生量显著减少,并且对生产线的稳定性没有副作用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
Fuel Processing Technology
Fuel Processing Technology 工程技术-工程:化工
CiteScore
13.20
自引率
9.30%
发文量
398
审稿时长
26 days
期刊介绍: Fuel Processing Technology (FPT) deals with the scientific and technological aspects of converting fossil and renewable resources to clean fuels, value-added chemicals, fuel-related advanced carbon materials and by-products. In addition to the traditional non-nuclear fossil fuels, biomass and wastes, papers on the integration of renewables such as solar and wind energy and energy storage into the fuel processing processes, as well as papers on the production and conversion of non-carbon-containing fuels such as hydrogen and ammonia, are also welcome. While chemical conversion is emphasized, papers on advanced physical conversion processes are also considered for publication in FPT. Papers on the fundamental aspects of fuel structure and properties will also be considered.
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