How to recover gaseous ammonia in liquid ammonia storage tank area?

Unpowered ammonia recovery method can be used; The principle is as follows: Without increasing external energy consumption, the unpowered ammonia recovery device uses low-temperature technology to extract ammonia from the purge gas to make finished liquid ammonia, which improves the added value of ammonia in the purge gas and solves the problem of environmental pollution caused by dilute ammonia water. The device is a set of energy-saving and efficiency-enhancing environmental protection projects. Process Description: The gas discharged from the ammonia tank of the synthesis station enters the first heat exchanger to exchange heat with the liquid ammonia separated from the first and second ammonia and the cold air from the outlet of the energy converter, then enters the first separator to separate part of the liquid ammonia, and then enters the second heat exchanger to exchange heat with the cold air from the energy converter. When the temperature drops to about -40℃, it enters the second separator to separate liquid ammonia, and the liquid ammonia separated from the first and second separators simultaneously enters the first heat exchanger to absorb heat and gasify into ammonia. The air released from the synthesis post tower enters the ammonia cooler after heat exchange in the condensation tower, and the temperature drops to about -20℃, and then enters the condensation tower to separate liquid ammonia. After ammonia is separated, it enters the buffer, then enters the energy converter for expansion refrigeration, and the temperature drops to about -65℃, and then enters the second heat exchanger. After heat exchange, it is mixed with the purge gas from the ammonia separator 2 and enters the first heat exchanger. After the gas comes out, it enters the isobaric ammonia recovery tower to purify ammonia, and the ammonia content is reduced to 5PPM. The design principle uses the pressure energy of the vent air behind the tower of the synthetic ammonia system to expand through the special energy converter for ammonia recovery, and output it to do external work, thus consuming the internal energy of the vent air itself, obtaining the maximum adiabatic enthalpy drop, and rapidly cooling the temperature of the vent air to -40~60℃. Because of the different boiling points of each component in the purge gas, gaseous ammonia is liquefied and separated. Equipment features: 1. The whole device has compact flow design, small floor space, reasonable equipment layout and convenient operation. 2. The energy converter adopts the patented product of ammonia recovery, which has high efficiency, strong anti-interference ability, low obstacle rate, difficult damage and reliable operation. 3. Choose efficient separation equipment and heat exchange equipment. 4. The device has advanced technology, reliable operation, no pollution and convenient maintenance. The technological indexes after ammonia recovery: 1, pressure 1.5 Mpa. 2. The ammonia content in the discharged air is ≤ 1%. 3. The ammonia content in the deflated gas is ≤2%. 4. The explosion pressure of the energy converter is 0.05 MPa. 5. The ammonia content of the exhaust gas and the exhaust gas leaving the water washing tower is ≤5PPM. View original post >>