Jet Mixers | Tank Mixing Ejectors | Tank Mixing Eductors
Jet Mixers or Tank Mixing Ejector / Eductor are a specially adapted technology for tank stirring, agitation of tank contents and for Introduction of chemicals & solid powders in the tank
Storage tanks in the Industry typically need the following add-ons for effective functioning:
- Agitation and Stirring: If the tank contents have a sludge forming tendency, the tank contents have to be stirred and agitated continuously to avoid sludge formation and sludge settling.
- Mixing: In process tanks, the contents have to be intimately mixed for carrying out effective reactions.
- Chemical & Powder introduction to support the ongoing reactions
- Heating & Cooling of the Tank contents.
Jet mixers or Tank Mixing Ejectors / Eductor facilitate all the above requirement through one single installation.
Working of Jet Mixers / Tank Mixing Ejectors / Tank Mixing Eductors:
Mixing, agitation and Stirring Regime:
Jet Mixers or Tank Mixing Ejector / Eductor are based on the Jet-Venturi effect and transfer the kinetic energy of high velocity liquid jet to the tank contents for agitating and mixing the tank contents.
A suitable bypass flow is taken from the tank and supplied to a motive pump. The pump pressurizes the motive liquid which is supplied to the jet mixers. Jet Mixers are installed inside the tank and the pressurized liquid (motive) from the pump is supplied to the mixer through the connecting pipelines.
The Mixers converts the high pressure motive liquid into a high velocity jet in the nozzle. The conversion of high pressure motive liquid into a high velocity jet creates a low pressure zone inside the mixer.
The low pressure zone sucks the tank contents inside the mixer. The entrained liquid then mixes with the high velocity motive jet. The mixing leads to transfer of energy and momentum to the liquid from the tank. This mixing of the sucked flow and motive flow inside the Jet Mixer is critical and mainly responsible for the excellent mixing characteristic exhibited by the Jet Mixers compared to directly introducing high velocity motive flow inside the tank.
The mixture of bypass flow and sucked tank contents is discharged at medium velocity into the tank.
Once discharged the mixture jet interacts with the liquid inside the tank and transfers its energy and momentum to the tank contents. The transfer imparts kinetic energy to the liquid inside the tank which initiates circulation of the liquid inside the tank.
The circulation created inside the tank and the turbulence produced during the interaction (between the discharged mixture from the jet Mixer and the liquid inside the tank) leads to intimate mixing, agitation and stirring.
Chemical & Powder Introduction Regime:
For chemical & Powder introduction, the chemicals can be added to the bypass flow taken from the tank and the mixed flow is supplied to the pump and subsequently to the jet mixer.
The Bypass flow generally has a pressure equal to the liquid head in the tank, hence the Chemicals & Powders need to be forced into the bypass flow which is easily and reliably accomplished through a Liquid jet Liquid Ejector/ eductor (for Chemical Introduction) or a Liquid jet Solids Ejector/eductor (for Powder Introduction).
This automatically introduces the chemicals inside the tank and is efficiently mixed with the tank contents due to the heavy turbulence and mixing created by the jet mixture.
Similarly Powders can be introduced with the help of a hopper into the tanks.
Heating & Cooling mode.
Heating and Cooling of the Tank contents by heat exchangers installed inside the tank is an inefficient way of heat transfer and creates large temperature variation especially inside large tanks.
Hence bypass flow is taken from the tank and passed to a pump which passes on the flow to a heat exchanger. The heat exchanger then heats / cools the bypass flow.
The heated / cooled flow is then supplied to the jet mixer which efficiently mixes and disperses the flow inside the tank. The Turbulence created during mixing facilitates excellent heat transfer from the bypass flow to the liquid inside the tank and the effective dispersion leads to even heating / cooling of the tank contents without creation of any temperature gradients inside the tank.
Comparison with Mechanical Agitators and Mixers:
| Crystal TCS's Jet Mixers | Mechanical Agitators |
|---|---|
| Jet Mixers are static devices having no moving parts. This increases the reliability tremendously and eliminates any maintenance requirement | Mechanical Agitators consists of Moving Parts which leads to repetitive maintenance due to seal failures and leakages. Maintenance typically requires draining the entire tank to take corrective action which requires considerable time and effort. |
| Efficient and even mixing can be achieved by distributing optimum number of mixers in the tank. Helps in eliminating any dead zones inside the tank | Installing multiple mechanical agitators in a single tank is a costly affair and the maintenance requirements further increase the operating cost.
This leads to uneven mixing and creates dead zones inside the tanks |
| The same jet mixers can be used for introducing and mixing chemical & powders in the tank | Mechanical agitators cannot be used for introducing chemical & powders in the tank. Separate Nozzle or Jet Mixers are required for the same purpose. |
| Provide even heating / cooling inside the tank when Motive is heated / cooled liquid. External heat exchangers used in this system type are more efficient in transferring heat to / from the bypassed liquids |
Heat exchangers installed inside the tank are comparatively less efficient in transferring heat to / from the liquid in the tank. Presence of dead zones and uneven mixing from the Mechanical agitators leads to uneven heating / cooling of the tank contents. |
Superlative Performance Characteristics
Advantages of our Jet Mixers / Tank Mixing Ejectors / Tank Mixing Eductors:
We manufacture Jet Mixers / Tank Mixing Ejectors / Tank Mixing Eductors in a large range of Materials:
| Metals | Non-Metals |
|---|---|
| Carbon Steel | PP (PolyPropylene) |
| Bronze | PVDF (Polyvinylidene Flouride) |
| Stainless Steel | |
| Duplex and Super Duplex Stainless Steels |
