[Soda Ash Knowledge] Question of the Day (143) March 4, 2010

The advantage of using packed towers for ammonia absorption is that the resistance to gas flow is low, making it easy to operate the ammonia distillation system under negative pressure, thereby saving steam. The disadvantages are that its absorption intensity is lower than that of the mushroom-tower; the liquid stays in the tower for a short time; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that is difficult to absorb; and its height is relatively large.

The advantage of using packed towers for ammonia absorption is that the resistance to gas flow is low, making it easy to operate the ammonia distillation system under negative pressure, thereby saving steam. The disadvantages are that its absorption intensity is lower than that of the mushroom-tower; the liquid stays in the tower for a short time; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that is difficult to absorb; and its height is relatively large. 1# steinback

The advantage of using packed towers for ammonia absorption is that the resistance to gas flow is low, making it easy to operate the ammonia distillation system under negative pressure, thereby saving steam. The drawbacks are that the absorption intensity is lower than that of the mushroom-tower; the residence time of the liquid in the tower is relatively short; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that cannot be absorbed; and its height is slightly greater.

Answer: The advantage of using a packed tower for ammonia absorption is that it offers low resistance to gas flow, making it easy to operate the ammonia distillation system under negative pressure, thereby saving steam. Its disadvantages are that its absorption intensity is lower than that of the mushroom-cap tower; the liquid stays in the tower for a short time; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that is difficult to absorb; and its height is relatively large.

Brief answer: What are the advantages and disadvantages of ammonia absorption in packed towers? Answer: The advantage of using a packed tower for ammonia absorption is that it offers low resistance to gas flow, making it easy to operate the ammonia distillation system under negative pressure, thereby saving steam. The disadvantages are that its absorption intensity is lower than that of the mushroom-tower; the liquid stays in the tower for a short time; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that is difficult to absorb; and its height is relatively large.

The advantage of using a packed tower for ammonia absorption is that it offers low resistance to gas flow, making it easy to operate the ammonia distillation system under negative pressure, thereby saving steam. Its disadvantages are that its absorption intensity is lower than that of the mushroom-cap tower; the liquid stays in the tower for a short time; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that is difficult to absorb; and its height is relatively large.

The advantages of packed towers for ammonia absorption are low resistance to gas flow, which facilitates distillation under negative pressure in the ammonia stripping system, thereby saving steam. The disadvantages include lower absorption intensity compared to bubble-cap towers, a short residence time of the liquid within the tower, fluctuations in the ammonia concentration of the ammoniated brine, significant losses of poorly absorbable carbon dioxide, and a relatively great height of the tower

Answer: The advantages of packed towers for ammonia absorption are that the resistance to gas flow is low, making it easy to operate the ammonia distillation system under negative pressure to save steam. The disadvantages include lower absorption intensity compared to bubble-cap towers, a short residence time of the liquid within the tower, significant fluctuations in the ammonia concentration of the ammonia brine, high losses of carbon dioxide that is difficult to absorb, and a relatively great height of the tower. 1# steinback

The advantage of using packed towers for ammonia absorption is that the resistance to gas flow is low, making it easy to operate the ammonia distillation system under reduced pressure, thereby saving steam； The disadvantages are that its absorption intensity is lower than that of the mushroom-tower; the liquid stays in the tower for a short time; the ammonia concentration in the ammoniated brine fluctuates greatly; there is significant loss of carbon dioxide that is difficult to absorb; and its height is relatively large.

A packed tower is a mass transfer device in which the packing inside the tower serves as the contact element between the gas and liquid phases. The body of a packed tower is a vertical cylinder, with a packing support plate at the bottom. The packing is placed on the support plate in a random or structured manner. Above the packing, a packing retaining plate is installed to prevent it from being blown away by the upward airflow. The liquid is sprayed from the top of the tower onto the packing via a liquid distributor, and flows down along the surface of the packing. Gas is fed from the bottom of the tower and, after being distributed by a gas distribution device (gas distribution devices are generally not used in towers with small diameters), it flows countercurrently to the liquid through the voids in the packing layer. On the surface of the packing, the gas and liquid phases come into close contact, facilitating mass transfer. Packed towers are continuous-contact gas-liquid mass transfer devices; the compositions of the two phases change continuously along the height of the tower. Under normal operating conditions, the gas phase is the continuous phase, while the liquid phase is the dispersed phase. 　　As the liquid flows downward along the packing layer, it tends to accumulate near the tower walls, resulting in a gradual increase in the liquid flow rate close to the walls. This phenomenon is known as wall flow. The wall flow effect causes uneven distribution of the gas-liquid phases within the packing layer, thereby reducing the mass transfer efficiency. Therefore, when the packing layer is relatively tall, it is necessary to divide it into sections, with a redistribution device placed in between. The liquid redistributor consists of two parts: a liquid collector and a liquid redistributor. The liquid flowing down from the upper packing layer is collected by the liquid collector and then delivered to the liquid redistributor, where it is redistributed and sprayed onto the lower packing layer. 　　Ammonia absorption in packed towers has advantages such as high production capacity, high separation efficiency, low pressure drop, low liquid holdup, and great operational flexibility. 　　The ammonia absorption process in packed towers also has some drawbacks, such as the high cost of packings ； When the liquid load is low, the filler surface cannot be effectively wetted, resulting in a decrease in mass transfer efficiency ； It cannot be used directly for materials with suspended particles or those prone to polymerization ； Complex distillations such as those involving feed and withdrawal on the opposite side are not very suitable, etc.