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1改造方案的提出1．1控制室改造的原因川化集团公司第一化肥厂尿素装置已运行20多年，装置经改造现年产量已达140kt以上。控制室自控仪表虽已多次改过换代，但仍存在型号杂乱、信号不准确和操作不方便等问题。近期因生产装置扩建需要搬迁控制室，决定更新控制室仪表。1.2仪表选
1 Proposed renovation program 1.1 Reasons for the transformation of the control room The urea plant of the First Fertilizer Plant of Chuanhua Group Company has been in operation for more than 20 years and the annual output of the plant has been upgraded to more than 140kt. Although the control room automatic control instrument has been changed over and over again, but there are still types of clutter, the signal is not accurate and inconvenient operation and other issues. Recently due to the expansion of production facilities need to relocate the control room, decided to update the control room instrumentation. 1.2 instrument selection