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  • Instruments and control system for fertilizer plant
  • Type selection and applications of level gauges for large-scale synthetic ammonia plant
  • Level instruments generally are classified into differential-pressure level gauge (including the blowing type), float type level transmitter, capacitance level gauge, ultrasonic level gauge, radar level gauge and radioactive level gauge.
    1. Differential-pressure level gauge
    Differential pressure level gauge is the most common level gauge, and nearly is applicable for the level measurement of various separators, storage tanks, washing towers, and boiler steam drum. Differential pressure level gauge is connected with pipelines, resulting in inconvenient maintenance. For the media with corrosion and easy crystallization, the differential-pressure level gauge with double-flange capillary is adopted, which is widely applied in ammonia synthesis and urea units.
    Main applications of differential-pressure level gauge:
    Differential-pressure level gauge is used for the level measurement of urea evaporator and stripper, for the level measurement of purification tower and CO2 stripper, and it is adopted in conjunction with double-chamber balance vessel to measure the liquid level of high-pressure steam drum (without flange and capillary).
    2. Float type level transmitter
    Different materials for internals of float type level transmitter can be selected to adapt to the level measurement of various materials with different temperatures and pressures.
    Main applications of float type level transmitter:
    Float type level transmitter is used for the level measurement of liquid-ammonia storage tank and ammonia evaporator, for the level measurement of clean media in washing tower and regeneration tower, and for the level measurement of such atmospheric or pressurized devices as common gas-liquid separator and water jacket. For the level measurement of high-medium pressure steam drum, high-temperature or high-pressure type level transmitter is adopted.
    3. Capacitive level gauge
    Capacitive level gauge is used in the vessel with metal structure.
    Main applications of capacitive level gauge:
    Capacitive level gauge is used to measure the liquid level of urea evaporation separator, the liquid level of urea storage hopper, the liquid level of the storage hopper for pulverized coal, and is used for the level measurement and alarm of other underground waste-liquid collection pool.
    4. Ultrasonic level gauge
    The installation of ultrasonic level gauge is simple and convenient, and the level gauge has the feature of not contacting the medium.
    Main applications of ultrasonic level gauge:
    Ultrasonic level gauge is widely used for the level measurement of storage bin for solid coal, and for the level measurement of circulating water pool and sewage pool.
    5. Radar level gauge
    The common measurement accuracy of radar level gauge has such two kinds as ±1mm and ±4mm.
    Main applications of radar level gauge:
    For the sake of reliability, liquid-ammonia tank often adopts two level instruments (one is radar level gauge and the other one is servo level gauge) together for measurement. Besides, radar level gauge is applicable for the level measurement of liquefied petroleum gas tank.
    6. Radioactive level gauge (it can be used as densimeter alone)
    Main applications of radioactive level gauge:
    Radioactive level gauge is used for the density measurement during the flow rate metering of pulverized coal in pulverized coal gasifier, for the level measurement of urea converter, for the level measurement of stripper and high-pressure armor ammonia condenser, and for the level measurement of armor ammonia separator.
    7. Electrode level gauge
    Main applications of electrode level gauge:
    Electrode level gauge is used for the auxiliary level measurement of high-medium pressure boiler steam drum. High-pressure steam drum level measurement of large-scale boiler often must be equipped with two to three independent level instruments according to the requirements of boiler. Among them, one is electrode type level gauge whose accuracy is not high but which is reliable and durable with visual display. Electrode level gauge can be mounted on the instrument panel with indication lamps, and can be displayed in graph and color on DCS.
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