Tubular heat Exchanger
Widely used tubular heat exchanger for chemical and alcohol production
Tubular exchanger is the most widely used heat exchanger on chemical and alcohol production. It is mainly composed of shell, tube plate, heat exchange tube, head, baffle and so on. Required material, can be made of ordinary carbon steel, copper, or stainless steel.
During heat exchange, a fluid enters through the connecting pipe of the head, flows in the pipe, and flows out through the outlet pipe at the other end of the head. Another fluid enters by the nozzle of the shell and flows out from another nozzle on the shell. This is called the shell process.
The structure of the tube heat exchanger is simple, compact and cheap, but the outside of the tube can not be cleaned mechanically. The heat exchanger tube bundle is connected to the tube plate, which is welded to both ends of the shell respectively, and is connected to the top cover. The top cover and the shell are provided with a fluid inlet and outlet pipe.
A series of baffles perpendicular to the tube bundle are usually arranged outside the tube. At the same time, the connection between tube and tubesheet and shell is rigid, while outside the tube are two kinds of fluid with different temperature. Therefore, when the temperature difference between the tube wall and the shell wall is large, due to the thermal expansion of the two are different, a large thermal stress is generated, so that the tube twists or loosens the tube from the tube plate, or even destroys the heat exchanger.
Temperature compensation device is must in order to overcome the temperature stress, generally while the tube wall and the wall temperature is 50 ℃ above, heat exchanger should have temperature compensation device for safety.
However, the compensation device (expansion joint) can only be used when the temperature difference between shell wall and tube wall is less than 60 ~ 70℃ and the fluid pressure in shell path is not high. When the pressure in shell passage exceeds 0.6mpa, other structures should be considered because the compensation ring is too thick and it is difficult to expand and lose the function of temperature compensation.
Tube heat exchanger has a simple structure, compact structure simple modeling makes it low manufacturing cost, cleaning all aspects of the need to pay attention to the tube is not to use mechanical cleaning. This kind of tube plate and the tube bundle of heat exchanger are connected in the corresponding way is more common, generally the tube plate and shell for welding and making the top cover, in the welding of the top cover and shell with pipes in order to allow the flow in and out.
Outside the heat exchange tube are baffles, which are rectangular to the tube bundle. The connection of pipe, tubeboard and shell is generally rigid, and there will be different temperature of liquid flow inside and outside of this set of pipes.
Long – term operation of tubular heat exchanger will lead to equipment being blocked by scale, which will reduce efficiency, increase energy consumption and shorten service life. If the scale is not removed in a timely manner, there is a risk of equipment repair, downtime, or replacement.
Long traditional cleaning methods such as mechanical method (shave, brush) and high pressure water, chemical cleaning (acid) a lot of problems in the heat exchanger when cleaning, such as: cannot completely remove scale and other sediments, and cause corrosion to equipment, residual acid on material corrosion or corrosion under the scale, eventually leading to replace equipment, in addition, the cleaning liquid is toxic, need a lot of money for wastewater treatment.
Enterprises can use high efficiency environmental protection cleaning agent to avoid the above situation, it has high efficiency, environmental protection, safety, no corrosion characteristics, not only good cleaning effect and no corrosion to the equipment, to ensure the long-term use of air compressor.
Detergent (add wetting agent and penetrating agent, can effectively remove water equipment produced by the most stubborn scale (calcium carbonate), rust scale, grease, sticky mud and other sediments, and won’t cause harm to human body, not of steel, copper, nickel, titanium, rubber, plastic, fiber, glass, ceramics and other material cause erosion, pitting, other harmful reactions such as oxidation, can prolong the service life of equipment.
Murphy Thermal Energy Co.Ltd is one of the best tubular heat exchanger manufacturer and supplier in China. Request a quote now!
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