Recycling of liquid ammonia exhaust gas!
Thread Content
Our current production process requires the use of liquid ammonia, and ammonia water is generated as a by-product of its use. At present, we recover ammonia by evaporating it from the ammonia water through heating; however, some liquid ammonia remains unrecovered after this process. Finally, the exhaust gas is neutralized by adding sulfuric acid. As a result, some ammonia is still released into the air, which can have an impact on our operators as well as the residents living in the surrounding area. Does anyone have a better process for completely recovering ammonia exhaust gas?
Could the reasons for incomplete recovery be the following: 1: The low temperature at the bottom of the distillation tower increases the ammonia content in the residual liquid. 2. The temperature of the ammonia vapor water cooler at the tower top is too high, preventing some of the gaseous ammonia from condensing. If the above reasons are excluded, standard emissions should be achievable
Ammonia evaporation can be carried out using a floating valve tower, which yields good results and enables compliance with first-level emission standards
As a reference, the practice of using an ammonium sulfate saturator for absorption after ammonia evaporation in coking can be employed to recover and produce ammonium sulfate. It can at least be reduced to below 30 mg/Nm3.
No matter what method is used for recovery, it is not possible to achieve 100% recovery; even if it were technically feasible, it would not be economical. Therefore, once a certain level of recovery has been achieved, other complementary processes can be employed for further treatment. For example, ammonia in aqueous solution can be recovered at 80-90%, or even higher, through ammonia evaporation, but some ammonia still remains in the water. In such cases, the A/O biological treatment process can be used for nitrogen removal. Ammonia recovery takes place in a sealed environment; ammonia is highly irritating, and if such an environment is not properly sealed, it will certainly have a significant impact on the surrounding area and the lives of local residents.
I’m sorry, we use an ammonia neutralization reaction! Does anyone have a suitable solution?
Our company uses a recirculation pump to spray water in mist form to absorb ammonia gas.
Could the friend on (Floor 7) please tell me the specific procedures and the equipment required?