Sell closed-loop ammonia nitrogen blow off systemDesign principles and related specifications

（1) Choose new processes with advanced and mature technology, stable and reliable systems, and low operating costs;

（2) The equipment does not affect the original facility layout, and the owner does not need to add new infrastructure;

（3) Fully consider the economic feasibility of the plan, save investment and operating costs.

（4) After processing, it meets the standards.

Sell closed-loop ammonia nitrogen blow off systemSelection and Introduction of Blow off Process

The blow off tower mainly consists of the following parts: blow off tower, inlet fan, fan inlet and outlet matching soft joints, blow off tower inlet elbow, exhaust chimney, automatic control system, and electrical control cabinet.

The structure of the blow off tower adopts a gas-liquid contact device, which is filled with packing inside the tower to increase the contact area. adjustThe water with a pH value is sprayed onto the packing material from the top of the tower to form water droplets, which fall down through the gaps of the packing material and come into contact with the air blown upward from the bottom of the tower by the fan in reverse flow, completing the mass transfer process and converting ammonia from liquid phase to gas phase, which is discharged with the air to complete the blow off process.

The blow off method is used to remove ammonia nitrogen from water, which involves introducing gas into the water to allow sufficient contact between gas and liquid, allowing the dissolved free ammonia in the water to pass through the gas-liquid interface and transfer to the gas phase, thereby achieving the goal of removing ammonia nitrogen.

The ammonia nitrogen in water is mostly composed of ammonia ions（It exists in a state of equilibrium between NH4+and free ammonia (NH3). The balance relationship is as follows:

NH4++OH- NH3+H2O （1）

NH3+H2O→NH4++OH－

This relationship is affected byThe influence of pH value, when the pH value is high, the equilibrium shifts to the left and the proportion of free ammonia increases. At room temperature, when the pH value is around 7, most of the ammonia nitrogen exists in the form of ammonium ions, while when the pH is around 11, free ammonia accounts for approximately 98%. Free ammonia is easy to escape from water, and if aerated, it can promote the escape of ammonia from water. Among them, pH is the key to the effect.

The percentage distribution between ammonia and ammonia ions can be calculated using the following formula:

Ka=Kw /Kb=（CNH3•CH+）/CNH4+ （2）

In the formula:Ka - ionization constant of ammonia ions;

Kw - ionization constant of water;

Kb - ionization constant of ammonia water;

C - Substance concentration.

differentpH、 Dissociation rate of ammonia nitrogen at temperature%

pH 20℃ 30℃ 35℃

9.0 25 50 58

9.5 60 80 83

10.0 80 90 93

11.0 98 98 98

sellCirculating closed-loop ammonia nitrogen blow off systemSelection and Introduction of Purification Tower Process

The ammonia gas after blowing off enters the purification tower for neutralization and purification. The purified gas is then sent to the blowing off tower for use, achieving a closed cycle. The wastewater after blowing off continues to be sent back to the wastewater tank.

The purification tower uses sulfuric acid to purify the exhaust gas. Ammonia gas enters the purification tower along the tangential direction from the air inlet below the tower body. Under the power of the ventilation fan, it quickly fills the space in the inlet section and then uniformly rises through the equalization section to the * * stage packing absorption section. On the surface of the packing, ammonia gas in the gas phase reacts chemically with acid in the liquid phase and flows into the lower storage tank. The incompletely absorbed ammonia gas continues to rise and enter the * * stage spray section. In the spray section, the absorbing liquid is sprayed at high speed from uniformly distributed nozzles, forming countless small droplets that are fully mixed and in contact with the gas, continuing to undergo chemical reactions. Then, the ammonia gas rises to the secondary packing section and spray section for a similar absorption process as the * * stage. The second stage and * * stage nozzles have different densities, spray pressures, and absorption ranges of acidic gas concentrations. The process of contact between the spray section and the packing section is also a process of heat and mass transfer. By controlling the flow rate and residence time of the tower, the adequacy and stability of this process are ensured. The upper part of the tower body is the dehazing section, where the absorbed liquid droplets in the gas are removed. The treated clean air is discharged from the exhaust pipe at the top of the purification tower into the * * stage blow off tower for blow off treatment.

Using sulfuric acid as an absorbent, sulfuric acid reacts with ammonia to produce ammonium sulfate.

Contact: Manager Yao mobile phone:18831897799