Keep solids suspended by injection
Mixing Nozzle Process Description:
Conventional mixing in a tank is often thought to require mechanical mixing components, such as a large, motor-driven impeller. However, many applications in which immiscible liquids need to be kept mixed or solids need to be kept suspended may be done so with only a pump and submerged nozzles, greatly reducing system complexity, capital cost, and maintenance requirements.
Eductor mixing nozzles are completely submerged below the liquid in the tank and operate based on the simple premise that when velocity increases, pressure decreases. They are designed to take the velocity of the fluid pumped into the nozzle and convert it into a low pressure zone that induces surrounding liquid in the tank to enter into the nozzle. In this fashion, the amount of fluid that exits the nozzle is three to five times the amount of fluid that is pumped. This multiplier effect allows greater mixing efficiency while using smaller pumping capacity.
Even after liquids are combined, mixing nozzles can be used to agitate the combined fluid. For instance, if the mixture has many solids that are lighter or heavier than the liquid, agitation prevents them from floating or settling. The same is true for liquids of two different densities, or mixtures of oil and water based compounds. Additionally, uniform liquids can become stagnant, fostering bacteria growth, and/or stratify by temperature. Agitating keeps the solids suspended evenly while also preventing bacterial growth via mixing.
The most common setup consists of a pump-around system. The suction side of the pump is connected to the tank and draws off liquid through this pipe. The discharge side of the pump is piped to the nozzle inlet. Liquid is drawn from the tank, through the pump, and into the nozzle where it entrains more liquid and emits from the nozzle. The emitting stream propagates through the tank and keeps the liquid in the tank in motion. With the nozzles correctly located, agitating and mixing occurs without any moving components in the tank.
Setups other than pump-around systems are also in widespread use. Fresh feed can be supplied to the nozzle inlet rather than recycling it from the tank. This allows immediate mixing of the fresh feed with the contents of the tank, and then continuous mixing as the exit jet propagates downstream.
Selecting a Mixing Nozzle:
In choosing a mixing nozzle, you will first need to determine if you need an eductor or injection nozzle.
In eductor nozzles like the TurboMix, the motive fluid is combined with the tank contents within the nozzle before being sprayed back into the tank. These nozzles have large passages making them inherently clog resistant. TurboMix nozzles have no moving parts making them extremely durable; combined with the fact that they resist clogs, they are ready to run with minimal maintenance. The standard materials for our eductor nozzles are brass, 316 stainless steel, carbon steel, and glass filled polypropylene (plastic). Because of our in-house foundry, we are also able to offer TurboMix nozzles in a wide variety of materials, including many grades of stainless steel and nickel alloys.
Common Mixing Nozzle Uses/Installations:
TurboMix eductor nozzles are ideal to clear sludge, prevent sediment, create movement in the liquid, agitate for particle suspension, general mixing; and to inject chlorine, water additives, chemicals, acids, and other materials.
Water tower stratification can be addresses with these simple eductor nozzles at a low cost compared to mechanical technologies. In large water towers, thermal stratification of the water can lead to poor water quality and inaccurate sampling. Several TurboMix nozzles can mitigate thermal stratification by keeping the water moving at all times.
Typical operating conditions for this application are listed for each nozzle