Why must carbon reduction systems strictly control water balance?

The water balance of the carbonization system refers to the condition where the water added to the system equals the water consumed in the carbonization process, thereby maintaining a balance in the total amount of water in the system. The water consumed by the carbonization system is mainly ； 1. Water is used to produce ammonium bicarbonate; as can be seen from the carbonation reaction equation, 1 water molecule is consumed for every 1 ammonium bicarbonate molecule produced. 2. Water entrained in the finished ammonium bicarbonate. 3. Dilute ammonia water, mother liquor, and concentrated ammonia water lose water during storage and transportation.

I wonder if the original poster knows what type of decarbonization method it is: pressure swing adsorption or wet decarbonization?

It is very important for the decarbonization system to maintain water balance. The water balance of the decarbonization system is as follows: the water brought into the system from the process gas； Amount of water carried out of the decarburization system by the decarburized gas ； Amount of water carried out of the system by CO2 gas ； The amount of water entering the system and the amount leaving it must be equal in order to maintain water balance. A poor water balance can have adverse effects. If too much water is introduced into the system, the decarburization liquid will be diluted, affecting the absorption efficiency. If too much water is removed from the system, the liquid level in the system will drop, which affects the operation of the system pumps and the flow rate. It also increases the load on the water removal equipment in the system.

This topic has been discussed many times; regarding the gas purification process for carbonization (the production of ammonium carbonate), two important balances need to be considered in terms of material balance – one is the ammonia balance and the other is the water balance. Take the ammonia balance as an example: if this balance is not properly managed and there is a deficiency of ammonia, it is very likely to lead to an increased load on the chiller and higher electricity consumption. In more severe cases, it can result in a lack of ammonia available for cooling in the ammonia synthesis process (including copper-based ammonia cooling), preventing the temperature from dropping. This situation becomes more apparent during summer or when the plant is in operation. Take water balance (the concept of water balance was introduced above) as an example: if there is an excess of water, it can cause the dilute ammonia solution to fill the storage tanks, forcing it to be discharged, which not only wastes resources but also pollutes the environment. In fact, in the ammonia synthesis process (the ammonium carbonate process), the water balance and the ammonia balance are interrelated and influence each other. In general, to maintain ammonia balance and water balance, it is necessary to optimize the operating conditions in various units, reduce the temperature of the circulating water, and improve the efficiency of the equipment (especially heat exchangers and synthesis towers).

3# Luo Hu 15185080221: We use wet decarburization.

In the case of propylene decarboxylation, if more water enters the system than leaves it, this will increase the water content in the propylene liquid, leading to equipment corrosion and a decrease in absorption efficiency, as well as an increase in the CO2 content in the exhaust gases.

Result 1: Full of liquid – you’ll hate it. 2: Dry pan – you’ll realize that the swirls are caused by iron

Is what the poster is referring to the water balance control in the production process of ammonium bicarbonate?

In the propylene carbonate decarboxylation process, controlling the water content in the solution is essential in order to maintain a solution purity of 98% or higher and a water content of less than 2%, thereby preventing corrosion of the equipment； When there is plenty of water in the dilute solution, adding water to the system disrupts the balance; when there is little water in the dilute solution and it approaches saturation, the recovery efficiency of the carbon propylate solution is low, resulting in high production costs.

For propylene decarburization, the main requirements are to reduce propylene consumption and ensure the purity of the outlet gas; equipment corrosion protection is a secondary concern