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Plate Heat Exchangers

A plate type heat exchanger is a type of heat exchanger that uses metal plates to transfer heat between two fluids. Plate Heat Exchanger has a major advantage over a conventional heat exchanger in that the fluids are exposed to a much larger surface area because the fluids spread out over the plates. This facilitates the transfer of heat, and greatly increases the speed of the temperature change. Plate Heat Exchanger is not as common to see plate heat exchangers because they need well-sealed gaskets to prevent the fluids from escaping, although modern manufacturing processes have made them feasible. The concept behind a heat exchanger is the use of pipes or other containment vessels to heat or cool one fluid by transferring heat between it and another fluid. In most cases, the exchanger consists of a coiled pipe containing one fluid that passes through a chamber containing another fluid. The walls of the pipe are usually made of metal, or another substance with a high thermal conductivity, to facilitate the interchange, whereas the outer casing of the larger chamber is made of a plastic or coated with thermal insulation, to discourage heat from escaping from the exchanger. The plate heat exchangers (PHE) was invented by Dr Richard Seligman in 1923 and revolutionized methods of indirect heating and cooling of fluids.

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Vertical Shell and Tube Heat Exchanger

A vertical shell and tube heat exchanger in which the tubes extend through oversized holes in a liquid distribution plate. Liquid flows through the holes and down each tube exterior surface as a falling film. A spacer or clip, desirably of wire, is placed in each hole around each tube to center the tube so that the film has a uniform thickness. The clip is self-locking and remains fixed securely in position. Vertical Shell and Tube Heat Exchanger is a heat exchanger that is derived from its parent Shell and Tube Heat Exchanger and it is most commonly all Industries which involves higher-pressure and Higher Temperature applications. Shell and tube heat exchangers consist of a series of tubes. One set of these tubes contains the fluid that must be either heated or cooled. The second fluid runs over the tubes that are being heated or cooled so that it can either provide the heat or absorb the heat required. A set of tubes is called the tube bundle and can be made up of several types of tubes: plain, longitudinally finned, etc. Shell and tube heat exchangers are typically used for high-pressure applications (with pressures greater than 30 bar and temperatures greater than 260 °C).[2] This is because the shell and tube heat exchangers are robust due to their shape.

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Pressure Vessel Heat Exchanger

A pressure vessel is a closed container designed to hold gases or liquids at a pressure substantially different from the ambient pressure. It differential is dangerous and many fatal accidents have occurred in the history of pressure vessel development and operation. Consequently, pressure vessel design, manufacture, and operation are regulated by engineering authorities backed by legislation. For these reasons, the definition of a pressure vessel varies from country to country, but involves parameters such as maximum safe operating pressure and temperature. Pressure vessels can theoretically be almost any shape, but shapes made of sections of spheres, cylinders, and cones are usually employed. A common design is a cylinder with end caps called heads. Head shapes are frequently either hemispherical or dished (torispherical). More complicated shapes have historically been much harder to analyze for safe operation and are usually far more difficult to construct.

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Plate finned type Heat Exchanger

We are the leading manufacturers of Plate finned type Heat Exchanger in India.A plate-fin heat exchanger is a type of heat exchanger design that uses plates and finned chambers to transfer heat between fluids. It is often categorized as a compact heat exchanger to emphasise its relatively high heat transfer surface area to volume ratio. The plate-fin heat exchanger is widely used in many industries, including the aerospace industry for its compact size and lightweight properties, as well as in cryogenics where its ability to facilitate heat transfer with small temperature differences is utilized.Plate-fin heat exchangers are generally applied in industries where the fluids have little chances of fouling. The delicate design as well as the thin channels in the plate-fin heat exchanger make cleaning difficult or impossible.

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Removable Tube Sheet Heat Exchangers

Removable Tube Sheet Heat Exchanger is a process that involves cutting tubes, pulling out tubes and tube stubs, and even knocking tubes out of the vessel. You can look Elliott for all your tube removal needs ranging from tube cutters tube tuggers pneumatic hammers.The tube removal process includes several process steps that must be performed with critical sequencing and lerances. The initial step of our process is the Tungsten Inert Gas (TIG) shrinking of the tube -tube sheet expansion joints (where applicable), which is performed with our standard plug removal TIG system. For hard rolled and tubes the shrinking process is necessary relieve the radial stress between the tube and tube sheet. The TIG process is cfully monired for power and travel so that only designated as in the tube shrunk. For some tubes with minimal tube sheet contact, shrinking is not required.

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Fixed Tube Sheet Heat Exchangers

Tube removal is a process that involves cutting tubes, pulling out tubes and tube stubs, and even knocking tubes out of the vessel. You can look to Elliott for all your tube removal needs ranging from tube cutters to tube tuggers to pneumatic hammers.The tube removal process includes several process steps that must be performed with critical sequencing and tolerances. The TIG process is carefully monitored for power and travel so that only designated areas in the tube are shrunk. For some tubes with minimal tube sheet contact, shrinking is not required.The initial step of our process is the Tungsten Inert Gas (TIG) shrinking of the tube to-tube sheet expansion joints (where applicable), which is performed with our standard plug removal TIG system. For hard rolled and tubes the shrinking process is necessary to relieve the radial stress between the tube and tube sheet.

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U Tube Bundle Heat Exchangers

A heat-exchanger system consisting of a bundle of U tubes (hairpin tubes) surrounded by a shell (outer vessel); one fluid flows through the tubes, and the other fluid flows through the shell, around the tubes.Multitherm can duplicate any existing bundle to include dimensions, materials and performance. we can build "U" tube bundles, straight tube "floating" tube bundles, or we can retube fixed tubesheet heat exchangers when the bundles is not removable. multitherm is not locked into any one material. Most bundles tend to be build with copper tubes and steel tubesheets.In nuclear power plants called pressurized water reactors, large heat exchangers called steam generators are two-phase, shell-and-tube heat exchangers which typically have U-tubes. They are used to boil water recycled from a surface condenser into steam to drive a turbine to produce power. Most shell-and-tube heat exchangers are either 1, 2, or 4 pass designs on the tube side. This refers to the number of times the fluid in the tubes passes through the fluid in the shell. In a single pass heat exchanger, the fluid goes in one end of each tube and out the other. A tube bundle heat exchanger with baffles is disclosed wherein a tube bundle is housed within an inner casing which is acted upon from both the inside and the outside by a heating medium

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Air Cooled Heat Exchangers

Air-cooled heat exchangers generally used where a process system generates heat which must be removed, for which there is no local use. A good example is the radiator in your car. The engine components must be cooled to keep them from overheating due to friction & the combustion process. The excess heat is carried away by the water and glycol coolant mixture. A small amount of the excess heat may be used by the car's radiator to heat the interior. Most of the heat must be dissipated. One of the simplest ways is to use the ambient air. Air-cooled heat exchangers (often simply called air-coolers) do not require any cooling water from a cooling towers. They are usually used when the outlet temperature is more than about 20 deg. F above the maximum expected ambient air temperature. They can be used with closer approach temperatures, but often become expensive compared to a combination of a cooling tower and a water-cooled exchanger. Typically, an air-cooled exchanger for process use consists of a finned-tube bundle with rectangular box headers on both ends of the tubes. Cooling air is provided by one or more fans. Usually, the air blows upwards through a horizontal tube bundle.

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Air Cooled Condenser Heat Exchangers

Air Cooled Condenser condensate exhaust steam from the turbine and return the condensate to the boiler. The axial flow forced draft fan is fixed in the module and forces the atmospheric cooling air across the Condensate area of the fin tubes. The typical scope an ACC installation includes the supporting structure, the steam ducting from the steam turbine interface, auxiliaries that condensate and drain pumps, condensate and duct drain tanks, the air evacuation units and related piping works and instrumentation. Since there is no intermediate surface condenser like Indirect Dry Cooling, the overall performances is better.

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Double Pipe Heat Exchangers

A double pipe heat exchanger, in its simplest form is just one pipe inside another larger double pipe heat exchanger. One fluid flows through the inside pipe and the other flows through the annulus between the two pipes. The wall of the inner pipe is the heat transfer surface. The double pipe heat exchanger are usually doubled back multiple times as shown in the diagram at the left, in order to make the overall unit more compact. The term 'hairpin heat exchanger' is also used for a double pipe heat exchanger of the configuration in the diagram. A hairpin heat exchanger may have only one inside pipe, or it may have multiple inside tubes, but it will always have the doubling back feature shown. . Some double pipe heat exchanger manufacturers advertise the availability of finned tubes in a hairpin or double pipe heat exchanger. These would always be longitudinal fins, rather than the more common radial fins used in a crossflow finned tube heat exchanger.

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Finned Tube Heat Exchangers

A Finned Tube is a type of heat exchanger design that uses plates and Finned Tube chambers to transfer heat between fluids. It is often categorized as a compact heat exchanger to emphasise its relatively high heat transfer surface area to volume ratio. The plate-fin heat exchanger is widely used in many industries, including the aerospace industry for its compact size and lightweight properties, as well as in cryogenics where its ability to facilitate heat transfer with small temperature differences is utilized.

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Stainless Steel Heat Exchangers

Stainless steel also known as inox steel and defined as a steel alloy with a minimum of 10.5% to 11% chromium content by mass. It does not flake, rust or stain with water as regular steel does, but in spite of the name it is not fully stain-proof. stainless steel is also called corrosion-resistant steel or CRES when the alloy type and grade are not exhaustive, particularly in the aviation industry. There are different grades and surface finishes of stainless steel to go with the environment the alloy must endure. Stainless steel is used where both the properties of steel and fighting to corrosion are mandatory. Stainless steel differs from carbon steel by the amount of chromium present. Open to attack carbon steel rusts readily when exposed to air and moisture. stainless steel iron oxide film (the rust) is active and accelerates corrosion by forming more iron oxide. Stainless steels contain sufficient chromium to form a passive film of chromium oxide, which prevents further surface corrosion and blocks corrosion from spreading into the metal's internal structure.

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Flue Gas Air Pre Heater

An air preheater (APH) is a general term to describe any device designed to heat air before another process (for example, combustion in a boiler) with the primary objective of increasing the thermal efficiency of the Flue Gas Air Pre Heater. They may be used alone or to replace a recuperative heat system or to replace a steam coil. In particular, this article describes the combustion air preheaters used in large boilers found in thermal power stations producing electric power from e.g. fossil fuels, biomasses or waste. The purpose of the air preheater is to recover the heat from the boiler flue gas which increases the thermal efficiency of the boiler by reducing the useful heat lost in the flue gas. As a consequence, the flue gases are also sent to the flue gas stack (or chimney) at a lower temperature, allowing simplified design of the ducting and the flue gas stack. It also allows control over the temperature of gases leaving the stack. Air pre-heater transfer heat from flue gas to air by means of a rotary matrix in which heat is absorbed by the heating elements passing through the hot gas stream and transferred to the combustion air stream.

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Kettle Reboiler Type Heat Exchanger

Kettle reboilers are very simple and reliable. Kettle reboilers may require pumping of the column bottoms liquid into the kettle, or Kettle reboilers may be sufficient liquid head to deliver the liquid into the reboiler. In Kettle reboilers type, steam flows through the tube bundle and exits as condensate. The liquid from the bottom of the tower, commonly called the bottoms, flows through the shell side. There is a retaining wall or overflow weir separating the tube bundle from the reboiler section where the residual reboiled liquid (called the bottoms product) is withdrawn, so that the tube bundle is kept covered with liquid.Kettle reboilers are reliable in that they can handle high vaporization of up to 80 percent and are easy to maintain. The liquid from the bottom of the tower flows through the tube bundle and exits as condensate. A restraining device (baffle) controls the liquid level over the bundle. However, the high level of vaporization makes it prone to fouling, and these reboilers are expensive due to their large shell size and maintenance.

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