Ji'an 50m3 liquid ammonia storage tank manufacturing company, ammonia storage tank
The liquid ammonia storage tank shall be transported and uncovered as less as possible. If it needs to be transported, it shall be fixed on the trunk with a rope and kept upright. It shall be careful not to fall, knock over and lie horizontally, and try to prevent violent vibration.
The traffic trunk lines, such as the station, wharf, airport, highway and railway, are densely populated areas, with a large number of people coming and going, which is very easy to cause safety accidents and crises. It can be set up only after being approved by relevant departments to engage in the loading, unloading and storage of hazardous chemicals. It is strictly prohibited to set up in densely populated areas such as school residential areas near transportation hubs. Tank farms cannot be built. It is highly volatile, and the ammonia produced is toxic. Once leaked, the consequences will be unimaginable. It is strictly prohibited to set in densely populated areas.
The liquid ammonia contained in the cylinder will undergo a phase change, that is, vaporization, and the liquid ammonia will change into gaseous ammonia. The pressure of the cylinder will rise. At this time, the temperature inside the cylinder is still the coexistence temperature of liquid ammonia and gaseous ammonia, which is generally - 196 ℃. If the temperature of absorbing external heat continues to rise, the pressure will continue to rise. The pressure relief safety valve will work to relieve the pressure. If the pressure is not relieved, it will only rise, The pressure of liquid ammonia in the cylinder will be very high, resulting in a high-pressure vessel. The liquid ammonia for industrial use changes from ammonia gas to colorless liquid under pressure at extremely low temperature. At this time, the temperature of liquid ammonia is very low, then it is stored in steel cylinders, and then the steel cylinders are placed at room temperature. As the ambient temperature of low-temperature storage tanks rises, the heat exchange container is used to complete the heat exchange of the medium.
Before using the liquid ammonia storage tank, a small amount of liquid ammonia shall be injected to precool it. When the temperature in the tank reaches the liquid ammonia temperature, the liquid ammonia shall be filled until the tank is full. Liquid ammonia storage tank is a high vacuum refrigerator. So how to prolong the service life of liquid ammonia storage tank during its use? Let's share how to prolong the service life of liquid ammonia storage tank.
Liquid ammonia tank shall be cleaned once or twice a year to avoid water accumulation, pollution, and corrosion of tank wall caused by bacteria propagation. The cleaning method is to use washing powder or neutral detergent to prepare a cleaning solution to scrub, and then rinse it repeatedly with clean water, and then dry it upside down by natural air or blow dry. The cleaning liquid ammonia tank should be placed in a dry and ventilated room. When moving, be careful to collide and avoid the liquid ammonia contacting the neck when filling the liquid ammonia outside. Do not often pour liquid ammonia out of the tank directly to avoid freezing the neck. If the tank wall is frosted or the liquid ammonia is consumed too fast, it indicates that the insulation of the tank is abnormal. Make.
Considering that in order to prevent liquid ammonia from diffusing into the space after the safety valve is opened, the pressure relief port of the safety valve and the ammonia accident treatment system (equipped with ammonia tank recovery device) are used to manage the archives of the safety valve in use, and the use of each safety valve is monitored online, and the responsibility is assigned to each operator; The safety valve shall be regularly maintained to ensure that it will not be over used, corroded or out of control, so as to play the safety role of the safety valve.
Clean the air inside the new storage tank before it is put into use; In the process of filling, discharging and maintenance, take certain measures to avoid any air, which can prevent stress corrosion. Adopt reasonable structure and welding process. The stress concentration caused by too many and too concentrated welds, asymmetric weld crossing and unreasonable welding sequence shall be avoided structurally.
Liquid ammonia loading and unloading truck shall be loaded and unloaded under liquid. The railway loading and unloading platform for liquid ammonia shall be equipped with safety ladders every 60m or so. The railway loading and unloading platform for liquid ammonia should be set separately; When not working at the same time, it can also be set up together with combustible liquid loading and unloading platform. Liquid ammonia is strictly prohibited to be discharged on the spot to avoid causing. The distance between loading and unloading positions of liquid ammonia truck shall not be less than 4m. The truck loading and unloading yard for liquid ammonia shall adopt cast-in-place concrete floor.
To check the storage capacity of liquid ammonia in the liquid ammonia tank, you can use the weighing method, or you can use the method of inserting a small wooden bamboo rod into the liquid ammonia depending on its frosting height (liquid level height). Do not use a hollow tube to insert it, so as to prevent the noodles from splashing out of the tube and hurting people. Pay attention to replenishing liquid ammonia in time during use. When replenishing liquid ammonia to the liquid ammonia tank, the liquid level shall not be empty of the lower end plane of the neck pipe. Please handle the frozen goods with care when handling them.
Liquid ammonia tank products are divided into two types: storage and transportation. The storage type liquid ammonia tank is mainly used for the static storage of indoor liquid ammonia and frozen goods, and cannot be used for vehicle transportation; In order to meet the use conditions of transportation, the transportation type liquid ammonia tank is designed to be shockproof. In addition to standing storage, it can also be used for transportation when filled with liquid ammonia, but collision and severe vibration should be avoided. The following is a summary of 15 items that Tianchi liquid ammonia tank must pay attention to.
Rescue personnel entering the site shall be equipped with necessary personal protective equipment and wear chemical protective clothing type air respirators to prevent poisoning and freezing. When entering the leakage site for treatment, attention shall be paid to the accidents that may lead to serious leakage accidents due to safety protection, or directly affect the production system or even cause system shutdown. The accident shall be immediately reported to the person in charge of the unit and the emergency handling procedure shall be started.
Linkage sprinkler for ammonia leakage alarm in liquid ammonia storage tank area
The ammonia gas alarm is mainly used to detect the specific ammonia gas concentration value. The detector's on-site LCD displays the ammonia gas NH3 leakage concentration value. The system is composed of a gas alarm controller and a gas detector. The gas concentration at each detection point is displayed vertically. The host and the detector are connected in a split line or bus system. The installation and wiring are convenient, and multiple monitoring points can be centrally controlled, When the concentration of the detected gas in the environment reaches or exceeds the set alarm value, the alarm will give an audible and visual alarm immediately to remind the user to take safety measures.
The ammonia alarm can be connected to the exhaust fan through the on-off output, the spray system can be uploaded to the PLC, DCS system and other external equipment, which are widely used in food processing, fertilizer plants, breeding farms, cold rooms, cold stores, freezer rooms, chemical plants, liquid ammonia tank farms, ammonia tank farms, cement plant desulfurization workshops and other places to ensure the safety of ammonia use.
Features of ammonia gas detector:
1. Imported gas sensor with high precision and small zero drift
2. The digital module design is adopted, and zero and calibration are not required for on-site replacement.
3. Flameproof design is applicable to hazardous conditions Zone 1 and Zone 2;
4. LCD field concentration display and LED field status indication can realize the operation status of the detector
5. Double chamber structure design of, suitable for outdoor environment
6. Partial hyperemia, chest tightness and sternal pain. Severe poisoning may cause laryngeal edema, laryngospasm and asphyxia when inhaling high concentration ammonia. Exposed skin may have grade II chemical burns, edema of eyelid, lips, nose, pharynx and throat, mucosal erosion, and possible ulcers. 1.4.2 First aid measures. In case of skin contact, immediately take off the contaminated clothes, and wash them with boric acid solution or a large amount of flowing water. Pay special attention to the wet parts such as armpit and perineum. Get medical attention. In case of eye contact, immediately lift the eyelid and flush it with a large amount of flowing water or physiological saline for at least 15 minutes. Get medical attention. Inhale and quickly leave the site to fresh air. Keep the respiratory tract unobstructed. If breathing is difficult, give oxygen. If breathing stops, perform artificial respiration immediately. Get medical attention. 1.5 Environmental hazards. It is harmful to the environment, pollutes the atmosphere, and causes frostbite to animals and plants. 2. Accident prone position 2.1 Gas phase inlet and outlet and liquid of liquid ammonia storage tank.
9. Slight leakage occurs at sealing points such as instruments, valves and manholes during normal production. The treatment method is to close the inlet valve of the accident equipment, close the isolation valve of the leakage instrument, and use plugging pads, plugging wedges, plugging glue, plugging tapes and other tools of different shapes to plug. After the gas ammonia in the equipment and pipeline is depressurized to the production area, fill nitrogen to replace the ammonia in the leaking equipment and pipeline, and then repair the leakage point. Valve leakage is generally the leakage at the gland, flange connection or valve core. It can be handled by directly tightening the valve gland and flange bolts with tools. In case of manhole leakage, the mat is generally invalid, and only the tank can be poured and replaced. (2) In the process of ammonia unloading, the loading arm interface valve and the rotating arm seal ring leaked. The treatment method is to check the leakage point. If the driver fails to connect the unloading arm and the tank car interface, stop unloading ammonia and reconnect. b、 If the leakage is large, close the ammonia unloading valve and the ammonia tanker valve. Open the fire hydrant or spray hose and use water.
10. The leaked liquid ammonia shall be diluted and repaired and replaced after the ammonia is exhausted. (3) A large amount of leakage suddenly occurs in liquid ammonia storage tanks, valves and pipelines. The treatment method is a. Quickly open the sprinkler and fire protection device, and flush with a large amount of water to prevent the diffusion of gas and ammonia around. b、 If the leakage point is behind the root valve of the tank, quickly cut off the root valve and the valves associated with the leakage part and other systems, and notify the maintenance personnel; If the leakage point is in front of the root valve of the tank, immediately send someone to cut off the connection between the tank and other systems, open the valve connecting the tank and the standby tank, use the method of pouring the tank to pressure the liquid ammonia in the tank to the standby tank, and after the pressure leakage is completed, cut off the connection between the tank and the standby tank, and notify the maintenance and emergency repair. c、 If the leakage point is in the tank body, the treatment method is as follows: the leakage point in article a and b is in front of the root valve. d、 If the leakage point is in the pipeline, flush the leaked liquid ammonia with a large amount of fire water along the wind direction according to the wind direction, and then cut off the leakage pipeline before it is close to the leakage point and convenient for operation.
11. Notify the maintenance personnel to repair the leakage point. e、 After receiving the report, the relevant leaders shall immediately arrive at the site and issue disposal instructions. In case of serious leakage, the irrelevant personnel nearby shall be notified to leave the site and give an alarm. f、 The rescue personnel shall wear appropriate protective equipment, find out the leakage part and take leak stoppage measures. Prevent leakage from entering sewers and drainage channels, and enhance ventilation. Smoking and open fire are prohibited in the place. g、 After handling the accident, immediately organize emergency repair after confirming that there is no other leakage source, and then the person in charge of the production unit shall call relevant personnel to investigate the cause of the accident, summarize the handling experience, and write an accident report. 4. 2 Leak stoppage method 4.2.1 Pressure relief and emptying When the tank crack size is too large to stop leakage, open the cooling spray forest, fire sprinkler and fire hose to arrange multiple water curtains at the accident site, form a solid water network in the air, cover the leakage area as much as possible, neutralize, dilute and dissolve the leaked ammonia. Start the waste water pump or move it temporarily.
