Introduction of safety accessories for liquid ammonia storage tanks
Time:2021-11-03
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Liquid ammonia, also known as anhydrous ammonia, is a colorless liquid with a strong pungent odor. The liquid ammonia storage tank is a liquefied gas storage tank containing liquid ammonia. Liquid ammonia storage tanks are classified as Class III pressure vessels. The liquid ammonia storage capacity of the liquid ammonia storage tank is generally left with a space of 10%-20%, which can effectively ensure the safe use of the liquid ammonia storage tank. Especially in the high temperature in summer, the effective cooling is adopted, and the water curtain spray method is set on the storage tank, thereby ensuring the safe use of the liquid ammonia storage tank. So what are the safety accessories for liquid ammonia storage tanks to prevent accidents?
1. Pressure gauge of liquid ammonia storage tank
The pressure gauge is one of the main safety accessories of the liquid ammonia storage tank. Due to the particularity of the chemical properties of liquid ammonia, the choice of pressure gauge is very important. Choose a bimetallic pressure gauge with corrosion resistance and corresponding level according to the actual situation. The pressure gauge needs to be calibrated every 3 months to ensure that the pressure gauge is sensitive and reliable. In order to ensure the safety of replacing the pressure gauge, a shut-off valve must be installed under the pressure gauge. During production, the pressure gauge display data of the liquid ammonia storage tank is tracked every hour to better grasp the pressure of the liquid ammonia storage tank. Changes. Website of manufacturer of liquefied gas storage tank: www.hbhxyr.com
2. Level gauge of liquid ammonia storage tank
The storage capacity of the liquid ammonia tank needs to be displayed with a level gauge, and a magnetic flip-type level gauge and a float level gauge are used to display the change of the liquid level to ensure the correct level of the liquid. Flip-type liquid level gauge, its principle is that the float floats on the liquid surface in the connecting pipe, and rises and falls with the rise and fall of the liquid level. The magnet placed in the float transmits the signal to the flap indicator installed on the outer wall of the connecting pipe. On the top, the flap is turned over with the change of the liquid level. Below the liquid level is red and above the liquid level is white. The characteristic of this level gauge is that the display is sensitive, correct, and not affected by temperature. The following failures often occur in the use of magnetic flap level gauges: First, the float cylinder has poor welding quality, penetrating air holes or slag inclusions, and the stored medium enters the float cylinder, causing the level gauge to fail; Second, the outer wall of the pontoon adsorbs impurities in the liquid ammonia, which makes it difficult for the pontoon to move up and down in the tube, causing the level gauge to fail. In view of the characteristics of the above level gauges, frequent maintenance should be carried out. According to experience, it is best to check once a year in order to find problems and deal with them. As for the float level gauge, the float changes with the level of the liquid level, and then converted into a 4-20m A current signal sent to the main control room, which can accurately reflect the level of the liquid level in time, facilitate operation and maintenance, and improve control indicators. And adopt effective control safety isolation equipment to ensure the safety of the system.
3. Safety valve of liquid ammonia storage tank
The safety valve is the main accessory of the liquid ammonia storage tank. Two safety valves are installed on each liquid ammonia storage tank to ensure that the liquid ammonia storage tank is protected under overpressure. The design pressure of the liquid ammonia storage tank is 2.5 MPa, the opening pressure of the safety valve is 2.0 MPa, and the maximum working pressure of the liquid ammonia system is 1.65 MPa. Taking into account that in order to prevent liquid ammonia from spreading into the space after the safety valve is opened, the pressure relief port of the safety valve and the ammonia accident treatment system (with an ammonia tank recovery device) are filed for the safety valves in use, and each safety valve On-line monitoring of the use of the safety valve is carried out, and the responsibility is assigned to each operator; the safety valve is frequently maintained and maintained to ensure that it is not used for an extended period of time, is not corroded, and does not lose control, so that the safety function of the safety valve can be played.
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