【 Weak current College 】 various types of heat exchanger description and advantages

1, BLL double spiral corrugated tube heat exchangers, heating medium in the tube into a Helix Mobile Forms, undermine the pipe wall of dielectric films, increasing the heat transfer surface heat transfer. Its heat transfer mechanism and fluorescent tubes and other forms of heat-transfer element are markedly different.
L the heat exchange efficiency is significantly improved because of the heat exchanger tube with heat conductive best copper tube production, the heat exchange efficiency than other than shell and tube heat exchanger, heat increases 3 ~ 5 times. In the steam-water heat exchanger, heat transfer coefficient K value in 4500 ~ 6500W/m2? ° c, between the water-water heat exchanger, heat transfer coefficient K value of 3200 ~ 5000W/m2? ¡æ.
Easy scaling
Due to the copper tube by a special process, in the course of their work, copper tube heat shrinkable extension so that dirt film peeling, preventing the fragmentation of scaling phenomenon.
High security performance
For tubes with thermal compensation ability, in the heat transfer process in a fixed performance is fine, you can reduce stress, the tube sheet and tube expansion interface is not easy to leak.
Installation flexibility
The device has a vertical, horizontal two structural type, can adapt various occasions to use, convenient and flexible.
This heat exchanger is GB150-1998, GB151-1999 page〈 page〈 steel pressure vessels > "and" page〈 tube-shell heat pressure vessels > > manufacturing, inspection and acceptance of, the safe, reliable, high-performance, is today's most outstanding new product. 2, SFP, LFP-floating coil heat exchanger and a half that is hot heat exchanger is adapted to modern needs developed a new kind of heat exchanger. It is the heating of water stored in the shell, htm (steam or hot water) in the control coil, it belongs to a limited water injection of heat exchanger, has less water injection (injection 1-3 minutes in water), but it can prompt supplemental heat. Due to the heat exchanger with high heat transfer efficiency, heat exchanger htm temperature regulators of imports must be installed to control the heat medium and heat water temperature, especially hot water supply systems, temperature control is even more important. Automatic descaling
Heat exchanger of spiral coil in htm temperature, pressure and centrifugal force, as well as heating water flow dynamic impulse, so that the coil around floating freely up and down, and the high frequency vibration, can scale easily glued in tube arm, automatic, automatic descaling. But in some parts may still be some scale cannot fall off per year should once Pipp, you can use hot water shock method, as follows: 1) put the net in the Shui shell. 2) close out of the inlet. 3) open into the steam valve and condensation water valve exhaust water NET pipe memory, and then close the condensation water valve, approximately 5-6 minutes to suddenly shut down into the steam valve, open cold water valve and the valve at the bottom of sewage, heating cooling Abscisic suddenly turned off at the same time, the continuous scale 5-6 times, then all rows of the net.
Energy-saving effect significantly, as htm in the tube is heated water in the shell, shell surface temperature is low, the thermal losses, energy conservation, especially the steam-water heat exchangers, cooling water temperature low, greater energy efficiency, and reduce environmental pollution. 3, BBR (BR) plate heat exchanger structure is relatively simple, it is made of plates, gasket, fixed clamping plate parts, among which the plate made of imported stainless steel plate, gasket with Sino-American joint venture production of Parker pad. The main technical indicators have reached domestic advanced level, and in many respects quite similar foreign products.
High heat transfer coefficient
Plate heat exchanger does not exist, bypass, plate corrugated makes fluid in smaller velocity turbulence under, so the higher heat transfer coefficient, usually 3000-7000W/㎡? ° c, while the turbulence and self-cleaning effect to prevent the formation of fouling.
Small footprint
Plate heat exchanger is compact, in thermal equivalent conditions, the space of only shell and tube heat exchanger 1/2 ~ 1/3.
Resistance losses small
In the same heat transfer coefficient, the plate heat exchanger flow through a sensible choice, resistance losses can be controlled in the shell and tube heat exchanger 1/3 range.
Small heat loss
Due to compact structure and small size, heat exchanger surface area is very small, so the heat loss is small.
In the same heat transfer quantity premise, because the above advantages, makes the equipment investment, infrastructure investments, power consumption, and other costs reduced, especially when you need to use expensive material, because of high efficiency equipment and sheet thin, more economic. 2. heat exchanger design and calculation
1. performance parameters calculation values:
1) heating steam General press pressure of saturated steam 0.4MPa table.
2) water is heated by conventional heating 70 ~ 95 ° c and the air conditioner 50 ~ 60 ° c, as well as water for 5 ~ 60 ℃.
3) heat transfer calculation of K value is by canal water flow rate is not lower than 0.5m/s calculated value, it is recommended to choose velocity 1-1.5m/s heat transfer coefficient K value increases also.
2, the thermal calculation formula:
Heat transfer equation
Q=K?△T?F
-The total amount of heat transfer in q MW/kcal/h
Heat transfer coefficient K express W/m2? ° c
¡÷ T represents a logarithmic temperature ℃
1)-T1 represents htm inlet temperature ℃
Type T2 said in a outlet temperature ° c hot matchmaker
Type t1 that is heated in the media inlet temperature ℃
Type t2 that is heated in a media outlet temperature ℃
2) heat transfer coefficient K value calculation is based on the thermal test report of the total heat transfer quantity Q/¡÷ T? F calculation of accurate values (thermal test tube flow less than 0.8m/s)
Calculate the k-value, in steam ~ water exchange when the steam temperature: 131 ° c, water is heated to 60 ° c 18 ~ the heat transfer coefficient K gravity(25℃) > 3500kcal/© o h ¡æ 4100W/© o £ ©
In water-water heat exchanger in K gravity(25℃) > 2800kcal/© o h ¡æ 3300W/© o £ ©
3) tube pressure drop calculation
△P=（△Pt+△Pr）×1.1
P-△ said shell-total pressure dropBR > △ Pt said tube shellside
△ Pr represents the pressure tubes section that force the heat transfer resistance 1.1 coefficient-N represents the tube chengshu
G represents the weight of the flow tubes (N/m2/h)
R indicates that the hot water of severe (N/m3)
G represents the gravitational Acceleration (g = 1.27 × 108) (m/h2)
Di represents inner diameter (m)
Tube length l (m)
3) tube box pressure drop △ Pr = 4G2N/2gr III, pump selection, configuration, and other
This heating unit, in addition to the heat exchanger is strict, the circulating pump, fill the pump selection is extremely important. The design of the heating unit, the installation process, engineers according to customer's actual situation, not only makes the pump head and flow, motor power, NPSH and many other factors, and the customer's actual situation adapted??