Kettle Without Agitation Videos
Most kettles today arestainless steel虽然铜水壶还发现。有限公司pper kettles have the advantage of more even heat distribution. They have the disadvantage of being incompatible with some products.
Many kettles have jackets into which steam, hot or chilled water or other heating or cooling fluid may be circulated. A temperature control commonly regulates the flow to maintain a desired temperature. PLCs or other controllers may be used to drive a sophisticated heating and cooling profile. For example, heat the base material quickly to 150 degrees, after adding a flavor heat rapidly to 200 degrees and hole for 1 hour, then cool slowly to 80 degrees for packaging.
Not all plants have steam for heating. Gas fired and electrically heated kettles are also available when necessary.
Kettles are often open topped or have a loose fitting lid. Some kettles have a sealed top to withstand internal pressure or vacuum. Pressurization and/or vacuum may be useful in “cooking” some types of food, pharmaceutical or chemical products. Pressure allows a water-based product to achieve temperatures above boiling without evaporating. Vacuum allows liquid to be boiled off at while keeping the product at a lower temperature than would be possible in an open kettle.
Kettles are often top loaded by opening the hinged top or through a handhole in a pressurized kettle. Some kettles have piping connections that permit the liquid components to be injected directly. This can be useful to prevent splashing, foaming or air entrainment.
Some kettles are designed to be drained from the bottom. These may have a simple fitting with ball valve on the bottom. This is generally undesirable unless the diameter of the discharge is fairly large in relation to its length. If not, it forms a “dead leg” in which product does not circulate well. Particles in suspension may also settle into this deadleg. Kettles with a bottom discharge should have a special, flush, valve to eliminate this deadleg.
Industrial liquid silos are a type of tank used for bulk storage of liquids and semi-liquids. They are commonly storage, as opposed to processing or transport tanks. Their high aspect ratio (height relative to diameter) and non-openable top is what makes them “silos” rather than “tanks”. Silos are often located outdoors though they can be located indoors ceiling height permitting.
- Mechanical floats connected by wire or magnetically to a scale
- Load cells to monitor the weight of the product in the silo
- Pressure sensors at the bottom of the silo. These convert head into level
- Size matters – Too small and it won’t hold sufficient product. Generally it is a good idea to oversize a tank to allow for future uses. Aspect ratio, the proportion of height to diameter may be determined by the space available but may also impact the product itself especially if the tank is to be used for mixing. Most tanks are vertical round cylinders but these take up more floor space than square tanks. Horizontal cylinders are also used for some applications.
- Stainless steel is a common material for process tanks and is compatible with most, but not all, products. All grades of stainless are not the same and it is important to pick the proper one for your product. Other materials include a variety of plastics, fiberglass, glass lined steel, copper and specialty metals.
- Open or closed? Open tanks may have a loosely fitting cover or not but they are will not hole pressure or vacuum. Closed tanks can be sealed and, generally, pressurized. A tank strong enough to withstand positive pressure is not necessarily strong enough to withstand negative pressure or vacuum. Draining or steaming a tank without proper venting and cause a tank to implode. All closed tanks must have proper pressure relief valves or rupture disks.
- Some tanks only need 2 openings for product to enter and leave. Many tanks need more. Level and pressure sensors will need fitments. A handhole or manhole may be useful for cleaning and inspection. Mixers or agitators may be required. These must be specified when designing a tank.
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