According to the production capacity, flow characteristics, product quality and process operation requirements of the process units, a central control room (“CCR”) is established for centralized monitoring and operation of the process production units, supporting utilities and auxiliary facilities. The process production units include the synthetic ammonia unit, urea unit and prilled urea unit, the supporting utilities consist of the raw water purification station, demineralized water station, circulating water station, and sewage treatment station, and the auxiliary facilities are comprised of the ammonia tank farm, air compressor station and flare. In the CCR, four operation zones respectively for the synthetic ammonia unit, urea unit, prilled urea unit and utilities (excluding the thermal power plant) are arranged according to the requirements for process control and production operation.
According to the General Layout Plan, the ammonia tank farm is provided with a DCS remote I/O station which sends signals to the CCR via optical cables. Three on-site cabinet rooms are provided for the water treatment stations of supporting utilities, i.e., the demineralized water station, sewage treatment station and circulating water & raw water purification station. During the start-up stage of water treatment stations, operators may work in relevant on-site cabinet rooms and then move to the CCR after normal production for centralized monitoring and operation of the whole plant’s process production units and water treatment stations. A thermal power plant control room is set for its central monitoring and operation.