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Quotes - Engineering - SalesHomogenizer circuit
Heating the CIP circuit through a lotion homogenizer
A high-pressure homogenizer is a positive-displacement piston pump pushing emulsion through a spring-loaded valve gap a fraction of a millimeter wide. In a lotion plant it finishes the emulsion, and it is cleaned in place by running the CIP solution through the same path at the machine's own stroke rate with the valve backed off. That makes the homogenizer a strange CIP circuit: the flow is fixed by the pistons at 20–30 gpm whatever the CIP pump would like to deliver, the volume is tiny, and the surfaces that matter are the valve seat, the impact ring, the plunger packing area and the check valves, all of which held hot emulsion that cooled into a wax film in a gap too small to see.
The circuit is therefore run hot and long rather than fast. Caustic at 2% with surfactant, 165°F at the homogenizer inlet, 30–45 minutes, with the machine stroking so the valve gap opens and closes and the film is worked loose. Because the flow is so low and the machine is at the end of a line, the wash arrives having lost heat the whole way, and the heater has to be set so that 165°F is still there when the solution reaches the valve. A heater that reads 165°F at its own outlet and 150°F at the homogenizer has cleaned the pipe and left the machine dirty.
Thirty gpm is a small duty with a long way to travel
Lifting 30 gpm of caustic from 65 to 175°F is a 110°F rise, about 1.65 MBtu/h and roughly 1,700 lb/h of 15 psig steam. The extra 10°F above the 165°F set point is what a 150-foot supply line gives back to the room.
What a homogenizer circuit asks of the wash
The film in a homogenizer is the richest in the plant: the emulsion was at its hottest and most concentrated passing the valve, and what stayed behind is fatty alcohol, ester and silicone with the water phase gone. Two percent sodium hydroxide with a booster at 165°F softens it; the mechanical action of the valve stroking finishes it. Plants that run the circuit at 150°F find a brown ring on the impact ring at the next inspection and add 15 minutes to the wash, which is the wrong fix.
Flow is set by the machine. A homogenizer rated for 25 gpm of product passes about 25 gpm of caustic, so the circuit cannot be sped up to carry more heat, and a 150-foot run of 1.5-inch or 2-inch tube from the CIP set loses 10°F on the way at that flow. The acid step is phosphoric at 0.5% and 130°F, run weekly; plants with hard water see scale at the valve seat if they skip it. Rinse is softened water at 120–140°F, which flushes the lifted wax before it can re-set.
A compact inline heater set above the target
Either the homogenizer is cleaned from the line's CIP tank, in which case the tank-loop heater serves it, or it has a dedicated once-through heater because it sits far from the CIP set. In the second case the heater is a small U-tube shell-and-tube with steam in the tubes and caustic in a 316L shell, sized for 30 gpm from 65°F makeup with a 110°F rise, about 1.65 MBtu/h and roughly 1,700 lb/h of 15 psig steam, with its outlet set at 175°F so that 165°F arrives at the machine. On 100 psig steam, condensing at 338°F, that is a bundle a person can carry.
Low flow means a low shell-side velocity, and we check it so the caustic does not short-circuit the bundle; a baffled shell with 3/4-inch tubes keeps the solution moving across the tubes. The bundle pulls for the wax that will eventually coat it. EPDM head gasket, shell rated 150 psig at 250°F, tri-clamp ends to match the homogenizer piping, and a mill-finish shell unless the plant holds the loop to a sanitary finish. A temperature transmitter at the machine inlet, not only at the heater, is the one instrument we ask the plant to add.
Sizing a homogenizer CIP heater
The machine fixes the flow, so the sizing turns on distance and temperature. These are the figures we work from.
- Homogenizer rated flow in gpm
- Distance and pipe size from the CIP set or heater to the machine
- Caustic strength, booster, and the set point at the machine inlet
- Makeup or tank temperature at the start of the wash
- Steam pressure where the heater will sit
- Whether a dedicated heater or the line's CIP tank loop will serve it
Call and talk it through with an engineer: 1-805-484-2992
Homogenizer cleaning circuit questions
You can, if the CIP tank loop reaches it and the rest of the line tolerates 175°F at the supply. Often it does not: the kettle gaskets or the filler seals are rated for 165°F and the plant will not raise the whole tank. A small dedicated heater at the homogenizer lets that one circuit run 10°F hotter without touching the rest of the line's set points.
It is small, and the exchanger is small with it, but the steam side still cycles from cold to 250°F or hotter three times per clean, and a U-bundle takes that without a fixed joint to work loose. A plate pack of the same duty would be smaller on the floor and harder on its gaskets. Small shell-and-tube units on steam are a standard build for us.
Put the temperature transmitter at the homogenizer inlet and record it, not the heater outlet. The heater outlet proves the heater; the machine inlet proves the wash. Set the heater so the machine reads 165°F at the coldest winter makeup, and trend the two readings together; a growing gap between them means the supply line insulation is failing or the flow has dropped.
Only if the heater is in the 100 gpm path and the homogenizer takes a 25 gpm slice of it through a bypass; then it is sized for 100 gpm and the homogenizer step is a low-load case for the steam valve. If the heater is dedicated and inline with the machine, it sees 25 gpm and is sized for that. Tell us which arrangement you have.
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