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Heat Exchanger Heat Transfer Solution Is Lack Of What
- Sep 01, 2017 -

Heat Exchanger heat transfer solution is lack of what
Heat Exchanger as the heating system in the most commonly used heat transfer equipment, its operating conditions directly affect the external heating quality. Analysis of Heat Exchangers in the operation of the reasons for the problem, the heat transfer station to achieve safe operation, energy saving work is significant. Heat Exchanger manufacturers, Heat Exchangers which brand of good, Hefei Heat Exchanger prices, advisory service hotline 0551-67317322.
The problems encountered during the operation, the system throughout the heating season, the main problem is the peak Heat Exchanger heat transfer. The Heat Exchanger is installed in the circulating water supply bypass, the use of double-tube Heat Exchanger, the design parameters: flow G = 1500t / h, heat transfer area F = 170m2, designed steam parameters t = 180 ℃, P = 0.2MPa, circulating water import and export design temperature △ t = 15 ℃. The Heat Exchanger during the operation, the inlet and outlet temperature difference △ t only about 5 ℃, although the adjustment, the effect is not, its role can not be fully developed.
For Heat Exchanger heat transfer problem is solved as follows:
Re-selection of the trap, in the hydrophobic pipeline to install a hydrophobic control valve, the trap is based on the heater water level changes, through the DDZ-Ⅱ type electronic adjustment system to achieve regulation and control. The water level signal of the heater is controlled by the differential pressure transmitter, the proportional integral unit and the operation unit. Finally, the control valve is operated by the electric actuator, and the size of the water supply is controlled by adjusting the valve opening degree. So that the Heat Exchanger can be timely discharge of hydrophobic, to ensure heat transfer effect.
Daily attention to control the quality of circulating water, strengthen water quality supervision, to minimize the occurrence of Heat Exchanger fouling;
For the system of steam measuring device, find the method as soon as possible to solve;
Regular disassembly of the heater or backwash, remove the heater debris, improve the heater efficiency;
In addition, when the equipment is put into operation at the beginning of the system, the air inside the heater should be released to avoid affecting the heat transfer quality.
Due to the type of Heat Exchanger structure, the use of conditional diversity, in addition to scaling in addition to the occurrence of various forms of failure, and thus Heat Exchanger inspection and maintenance work will become a safe and stable operation of the production device to ensure an important work. Hefei plate Heat Exchanger manufacturers for everyone to share our experience!
The failure of the Heat Exchanger is mostly caused by corrosion. The most common corrosion site is the heat transfer tube, followed by the tube plate, the Heat Exchanger head and the small diameter of the pipe. Corrosion and abrasion failure of the main reasons are: dirt corrosion, media corrosion, tube flow rate is too large and the occurrence of abrasion, corrosion and corrosion at the end of the pipe and so on.
In the Heat Exchanger running process, due to the higher hardness of the working medium, or the fluid contains particles, suspended solids, cooling water algae, bacteria, sediment and so will lead to the tube inside and outside the wall serious scaling. With the thickening of the dirt layer, heat transfer resistance increases rapidly, serious dirt will make the working medium flow channel block, resulting in rapid decline in heat transfer capacity.
In the heat transfer medium corrosion, stress corrosion, gap corrosion or collision, wear, etc., the tube will produce micro-cracks, if there is high tensile stress or alternating stress, the crack will quickly expand and leak.
According to the use of Heat Exchangers different conditions, pipe and tube plate connection joints can be divided into welding, expansion and expansion welding and three. Joint form in different forms of failure are also different.
The main problems in welding are: the occurrence of welding defects such as burning or not penetration; welding joints produce thermal stress caused by stress corrosion; pipe and tube plate hole between the gap may cause crevice corrosion; welding stainless steel material in the heat The change in the microstructure of the area resulted in a sharp drop in corrosion resistance.
For the expansion joints, Heat Exchanger there is a residual stress in the process of expansion, the joints may have the occurrence of stress corrosion temperature and media conditions quickly due to stress corrosion and failure; "expansion joints of the anti-pull off low, especially when When the temperature is higher than 300 degrees, the creep of the material will gradually reduce the residual pressure, the connection reliability is difficult to guarantee.
Expansion and welding to achieve the advantages of welding and expansion complement each other, with anti-repeated thermal shock and thermal corrosion, improve the anti-fatigue properties of joints and eliminate the advantages of gap corrosion. However, the expansion of welding and when the use of high operational requirements, generally used in more harsh operating conditions of the occasion.