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采用水溶液全循环法,碳铵改产4万t/a尿素装置在全国得到了普遍推广。由于小合成氨厂的职工素质,管理和技术水平短时间内很难适应尿素生产的要求,特别是对尿素中压系统认识不足,至使一吸塔操作不稳定,造成温度跑高,引起管道堵塞,水碳比高,合成塔转化率低,继而造成中压,低压,负压系统负荷增大,系统排放氨耗高,尿素缩二脲高。我厂尿素从开车至今深刻体会到尿素中压圈的物耗平衡问题是关系到整个装置操作好坏的关键。本文仅从尿素中压圈的物料与一吸塔调控的关系谈点体会。
Aqueous solution of the whole cycle, ammonium bicarbonate 40,000 t / a urea plant in the country has been widely promoted. Due to the small-scale ammonia plant staff quality, management and technical level is difficult to adapt to the short period of urea production requirements, especially for the lack of understanding of urea pressure system, to make a suction tower instability, causing the temperature to run high, causing pipeline blockage , High water-carbon ratio, low conversion rate of the synthesis tower, which in turn caused the load of medium-pressure, low-pressure and negative pressure systems to increase, the ammonia emissions of the system to be high, and urea biuret high. Urea plant urea from my car so far have a profound understanding of the pressure in the pressure ring of urea balance problem is related to the operation of the entire device is good or bad key. This article only from the pressure in the urea ring and a suction tower regulation of the relationship between the point of experience.