Plate heat exchanger

Plate heat exchanger
 

Product description:

My company production of plate heat exchangers and plate heat exchanger unit Features
1, energy efficient: the heat transfer coefficient in 2000-4500kcal / h, thermal efficiency than conventional shell and tube heat exchanger several times higher.
2, compact structure: plate heat exchanger plates are closely arranged, compared with other types of heat exchangers, plate heat exchanger less footprint and space the same area only plate heat exchanger tube heat exchangers. It is 1/5.
3, easy to clean, easy accessibility: the plate heat exchanger by clamping bolts clamping plate and clamping plate, and therefore easy disassembly, cleaning can be opened at any time and because the plate surface smooth, high degree of turbulence and difficult to scale.
4, long life: plate heat exchanger made of stainless steel or titanium alloy plate pressing, can be resistant to various corrosive media, pads can easily be replaced, and easy disassembly and maintenance.
5, adaptable: plate heat exchanger plate as a separate element, upon request free to change the process, in various forms; applicable to a variety of different process requirements.
6, no strings liquid, plate heat seal groove is provided to vent fluid channel, a variety of media is not collusion, even if leakage occurs, the media is always discharged outside.
Applications: plate heat exchanger has been widely used in metallurgy, mining, petroleum, chemical, power, pharmaceutical, food, chemical, paper, textile, shipbuilding, heating and other departments, it can be used for heating, cooling, evaporation, condensation, sterilization various conditions disinfection, waste heat recovery and so on.
Plate heat exchanger
Plate heat exchanger is a new and efficient heat exchanger consists of a series of metal sheet has a corrugated shape made of stacked Thin rectangular channel formed between the various plates, through heat exchange plates. Plate heat exchanger is a liquid - liquid, liquid -. Steam ideal heat exchange equipment it has a high heat transfer efficiency, heat loss is small, compact and lightweight, small footprint, easy installation and clean, wide application, long life and other characteristics in the same Under pressure loss, the heat transfer coefficient than the tube heat exchanger 3-5 times higher, covers an area one-third tube heat exchangers, heat recovery can be as high as 90%.
1.1 The basic structure of a plate heat exchanger
Plate heat exchanger consists of two parts frame and plate components.
Made of a thin sheet made of various materials with different forms of abrasive pressed into corrugated shapes and in the four corners of the plate hole has opened a corner, for medium flow path. Plates peripheral and angular hole is sealed with a rubber gasket.
Frame by the fixed clamping plate, movable clamping plates, upper and lower guide rod and clamping bolts and the like.
Plate heat exchanger is the plate in a superimposed form attached to the fixed clamping plate, movable pressing the intermediate plate, then clamped together with clamping bolt.
1.2 characteristics of plate heat exchanger (plate heat exchanger and shell and tube heat exchanger comparison)
a. the heat transfer coefficient is high due to the different corrugated plates are inverted, a complex flow path, the fluid in the flow passage between the corrugated board was rotating three-dimensional flow, can produce at low Reynolds number (= 50 to 200 ships Re) under turbulence, so the heat transfer coefficient is high, generally considered to be three to five times the shell and tube type.
b. logarithmic mean temperature, small temperature difference at the end of the shell and tube heat exchangers, the two fluids in the tube and shell flow, respectively, on the whole cross-flow flow, logarithmic mean temperature difference correction factor is small, and the plate heat exchangers are mostly current or countercurrent flow pattern, the correction coefficient is usually around 0.95, in addition, cold and hot fluid flow in the plate heat exchanger parallel to the heat transfer surface, no bypass, thus making the plate heat exchanger the end of the temperature difference is small, the water heat exchanger can be less than 1 ℃, and shell and tube heat exchanger is generally 5 ℃.
c. Small footprint compact plate heat exchanger, the heat transfer area per unit volume of shell and tube 2 to 5 times, but also not to be set aside as a shell and tube bundle maintenance extraction sites, thus achieving the same heat transfer, plate heat exchanger area of ​​shell and tube heat exchanger is about 1/5 ~ 1/10.
. d easy to change heat transfer area, or a combination of processes, as long as the increase or decrease a few plates, can be achieved by increasing or decreasing the heat transfer area of ​​the object; changing the arrangement or replacement of a few plates plates, you can achieve the desired combination of process adapt to new conditions exchanger, shell and tube heat exchangers and heat transfer area is almost impossible to increase.
e. lightweight plate heat exchanger plate thickness of only 0.4 ~ 0.8mm, and the thickness of the shell and tube heat exchanger tubes of 2.0 ~ 2.5mm, shell and tube shell than the plate heat exchanger frame much heavier, plate heat exchanger tube generally only about 1/5 of the weight of the shell type.
f. low prices of the same material, in the same heat transfer area, plate heat exchangers prices 40% to 60% lower than the shell and tube about.
g. make convenient plate heat exchanger heat transfer plate is formed by punching process, high degree of standardization, and mass production, shell and tube heat exchangers are generally handmade.
h. easy to clean frame plate heat exchanger as long as loose bolts can loosen the plate bundle, remove the plate for mechanical cleaning, which require frequent cleaning equipment heat transfer process is very convenient.
i. heat loss is only a small plate heat exchanger plate heat exchanger plate shell exposed to the atmosphere, so heat loss is negligible and does not need insulation measures. The large shell-and-tube heat exchanger heat loss, need insulation.
j. the capacity of the smaller shell and tube heat exchanger is 10% to 20%.
k. pressure loss per unit length due to the large gap between the heat transfer surface is small, the heat transfer surface has irregularities, and therefore larger than the conventional smooth tube pressure loss.
l. difficult to scale because of the internal fully turbulent, so easy to scale, and its scaling coefficient is only a shell and tube heat exchanger 1/3 ~ 1/10.
m. working pressure should not be too big, medium temperature should not be too high, it may leak using plate heat exchanger gasket seal, working pressure is generally not more than 2.5MPa, medium temperature should be lower than the following 250 ℃, otherwise it may leak.
n. easy to plug due to the very narrow passage between the plates, usually only 2 ~ 5mm, when the heat transfer medium contains large particles or fibrous material, easy to plug the channels between the plates.
1.3 plate heat exchanger applications
. a refrigeration: as a condenser and an evaporator.
. b HVAC: boiler with an intermediate heat exchanger, the intermediate heat exchangers and other high-rise buildings.
c chemical industry: soda ash industry, ammonia, alcohol fermentation, synthetic resin cooling.
d metallurgical industry: aluminate liquor heating or cooling, the steelmaking process cooling.
e machinery industry: a variety of quenching liquid cooling, cooling lubricants reducer.
f power industry: high-voltage transformer oil cooling, generator bearing oil cooling.
g paper industry: bleaching process heat recovery, heating the wash liquid and the like.
h textile industry: rayon alkaline aqueous solution is cooled, boiling nitrocellulose cooling.
i food industry: fruit juice sterilization cooling, animal and vegetable oil heating and cooling.
j oil Process: soap atmospheric drying, heating or cooling liquid for various processes.
. k central heating: heat and power plant waste heat for district heating, heating bath water.
l Other: petroleum, pharmaceutical, shipbuilding, desalination, geothermal use.
1.4 plate heat exchanger should be noted that the selection problem
1.4.1 plate selection
Type or corrugated sheet should be based on the actual needs of the heat exchanger case may be. For large flow allowable pressure drop is small, the resistance should be used in small form factor, whereas a large selection of resistance plate according to the fluid pressure and temperature Make sure to select a removable or brazed. should not choose the board area is too small to determine the plate when the plate in order to avoid an excessive number plate, inter-plate velocity is too small, the heat transfer coefficient is too low, for larger heat exchangers should pay attention to this issue.
Select the 1.4.2 process and flow channel
Process refers to a plate heat exchanger medium flowing in the same direction of a group of parallel flow channels, while the Dow flow plate heat exchanger inside the adjacent medium flow path consisting of two plates. Under normal circumstances, the number of flow paths Press fee that is parallel or series connected to form a cold, different combinations of the heat medium passage.
Process combinations should be calculated based on heat transfer and fluid resistance, determined to meet the requirements under the process conditions. Try to make cold, hot water heat transfer coefficient equal to or near the tract, resulting in optimal heat transfer. Because the heat both sides of the heat transfer coefficients obtained surface convective heat transfer coefficient equal or close when a larger value. Although the plates between the plate heat exchanger flow rate range, but in the heat transfer and fluid resistance calculation, the average flow rate is still calculated. Since ' U 'shaped single process to take over all fixed clamping plate, easy disassembly.
1.4.3 Checking the pressure drop
In the plate heat exchanger design and selection makes, generally have certain requirements for the pressure drop, so and should be checked. If you check the pressure drop exceeds the allowable pressure drop, the need to re-design selection calculations until meet the technical requirements so far
1.5 Plate Heat Exchanger Design Features
1, energy efficient: the heat transfer coefficient in 2000-4500kcal / h, thermal efficiency than conventional shell and tube heat exchanger several times higher.
2, compact structure: plate heat exchanger plates are closely arranged, compared with other types of heat exchangers, plate heat exchanger less footprint and space the same area only plate heat exchanger tube heat exchangers. It is 1/5.
3, easy to clean, easy accessibility: the plate heat exchanger by clamping bolts clamping plate and clamping plate, and therefore easy disassembly, cleaning can be opened at any time and because the plate surface smooth, high degree of turbulence and difficult to scale.
4, long life: plate heat exchanger made of stainless steel or titanium alloy plate pressing, can be resistant to various corrosive media, pads can easily be replaced, and easy disassembly and maintenance.
5, adaptable: plate heat exchanger plate as a separate element, upon request free to change the process, in various forms; applicable to a variety of different process requirements.
6, no strings liquid, plate heat seal groove is provided to vent fluid channel, a variety of media is not collusion, even if leakage occurs, the media is always discharged outside.
Applications: plate heat exchanger has been widely used in metallurgy, mining, petroleum, chemical, power, pharmaceutical, food, chemical, paper, textile, shipbuilding, heating and other departments, it can be used for heating, cooling, evaporation, condensation, sterilization various conditions disinfection, waste heat recovery and so on.