High efficiency heat exchanger

2.High flux tube high efficiency heat exchanger

The high-flux tube high-efficiency heat exchanger is to spray or sinter metal powder uniformly on the surface of the light tube. These powders form a layer of porous metal powder with numerous micropores and interconnected tunnels on the surface of the heat exchange tube. The porous coating on the surface not only increases the heat transfer area, but also the formation of countless vaporized cores greatly accelerates the bubble nucleation speed. The interconnected porous coatings also accelerate the agitation of the local liquid during the process of bubble growth and escape, and further strengthen the heat transfer coefficient outside the tube. Under the joint enhancement of many aspects, the heat transfer efficiency of the heat exchanger has been greatly improved.

3.High-efficiency heat exchanger with internal wave and external threaded tube

The heat exchange tube of the internal wave externally threaded tube high-efficiency heat exchanger is a special tube with a spiral corrugated tube inner wall and a threaded outer wall. The spiral inner corrugated structure causes the fluid boundary layer near the wall to be continuously destroyed, effectively reducing the thickness of the fluid boundary layer. When the outside of the tube is in a condensing condition, the condensate can be easily discharged from the threaded groove, avoiding the formation of a condensate film, and effectively reducing the heat transfer resistance outside the tube. Thereby greatly improving the overall heat transfer efficiency of the heat exchanger.

4.Bellows high-efficiency heat exchanger

The heat exchange tube of the corrugated tube high-efficiency heat exchanger is a special tube with corrugated inside and outside of the tube. The convex corrugated surfaces inside and outside the corrugated tube make the fluid in the boundary layer vortex. The vortex continuously mixes the fluid in the boundary layer with the fluid outside the boundary layer, and the heat transfer coefficient inside and outside the bellows tube is greatly improved, thereby greatly improving the heat transfer efficiency of the heat exchanger.

5.T-shaped groove tube high-efficiency heat exchanger

The heat exchange tube of the T-slot tube high-efficiency heat exchanger is a light tube as a blank tube, and the outer surface of the heat exchange tube is processed into a spiral T-shaped fin, and there is a special tube with an internal expansion cavity between the fins. The T-shaped groove structure not only provides a stable vaporization core for the fluid in the inner expansion cavity, but also makes the boiling fluid outside the tube form a thin liquid film on the tunnel wall, which effectively strengthens the boiling heat transfer coefficient outside the tube, thus greatly Improve the heat transfer efficiency of the heat exchanger.

6.High-efficiency heat exchanger with inner groove tube

The inner groove tube of the inner groove tube high-efficiency heat exchanger is a special tube with a smooth tube as a blank tube and a linear or spiral groove on the inner surface of the heat exchange tube. The groove structure provides a stable vaporization core for liquid vaporization. The thin liquid film formed by the fluid in the groove can be quickly evaporated, which effectively strengthens the heat transfer coefficient in the tube, thereby greatly improving the heat transfer efficiency of the heat exchanger.

7.Twisted tube high-efficiency heat exchanger

The twisted tube of the high-efficiency twisted tube heat exchanger is made of a bare tube as a blank tube and processed by a special machine tool. When the fluid flows longitudinally in the twisted tube, a secondary swirling flow perpendicular to the main flow direction is generated, which greatly improves the synergy between the velocity field and the temperature field; after the tube bundle is assembled, the shell side fluid flows through the spiral channel formed between the heat exchange tubes. , Under the action of centrifugal force, the speed and direction are periodically changed, and after the contact point, a wake is formed away from the tube wall, which increases the turbulence of the fluid. Under the combined effect of the enhanced heat transfer of the fluid inside and outside the twisted tube, the heat transfer efficiency of the heat exchanger is greatly improved.

8.Low-finned tube high-efficiency heat exchanger

The low fin tube of the low fin tube high-efficiency heat exchanger adopts a special tube whose outer surface is rolled into threaded fins. The low-fin tube not only increases the heat transfer area, but also when the shell-side fluid flows through the surface of the fin, the fin separates the fluid boundary layer, the thickness of the boundary layer is reduced, and the heat transfer resistance is reduced; in addition, the fin The periodic disturbance of the fluid at the tip also accelerates the heat transfer between the fluid and the wall. The heat transfer coefficient outside the tube is strengthened under the dual effects of the thinning of the fluid boundary layer and the periodic disturbance, which greatly improves the heat transfer efficiency of the heat exchanger.

9.High-efficiency heat exchanger with high fin tube

High-finned tubes for high-efficiency heat exchangers use smooth tubes as tube blanks and are rolled and pressed to form spiral fins on the outer surface of the tube. They are mainly divided into single-metal high-fin tubes and bi-metal high-fin tubes. Finned tube. The single-metal high-fin tube is processed into a fin-like shape from the outer surface of the metal tube blank, and the fin and the metal tube are integrated; the double-metal high-fin tube is tightly compounded by two kinds of metal tubes, and the outer metal tube The outer surface of the blank is processed into a fin shape. The high-fin tube not only expands the heat exchange surface area, but also promotes fluid disturbance, reduces heat transfer resistance, effectively increases the heat transfer coefficient outside the tube, and greatly improves the efficiency of the heat exchanger.

10.Baffle rod high-efficiency heat exchanger

The baffle ring of the high-efficiency baffle rod heat exchanger is formed by welding a set of parallel and equidistant baffle rods and a circular support ring. Every four adjacent baffle rings form a group, which are clamped from four directions. Tight heat exchange tubes, instead of traditional heat exchanger bow baffles to support the heat exchange tube bundles. The fluid in the shell side of the heat exchanger flows downstream along the axis of the heat exchange tube, and the special tube is further combined to enhance heat transfer, which can greatly improve the heat transfer efficiency of the heat exchanger.

11.Spiral baffle high-efficiency heat exchanger

The spiral plate high-efficiency heat exchanger is a compact plate-type high-efficiency heat exchanger. It is made by rolling two or more parallel metal sheets on a special rolling bed. The formed spiral body has two or more parallel spiral channels, and each channel is generally equipped with a fixed-distance column (bubble), which can not only maintain the channel spacing and improve the pressure-bearing capacity of the heat exchanger, but also interact with the fluid. Under the combined action of centrifugal force, the fluid can be turbulent at a lower Reynolds number, resulting in a higher heat transfer coefficient, thereby greatly improving the heat transfer efficiency of the heat exchanger.

12.Spiral plate high-efficiency heat exchanger

The baffle of the spiral baffle high-efficiency heat exchanger is assembled by spirally using several fan-shaped baffles. The medium in the shell side flows helically forward in the spiral channel formed by the baffle, the fluid is not easy to form a dead zone in the heat exchanger, and the fluid flow is more uniform. At the same time, special-shaped tubes are used to enhance heat transfer, which can greatly improve the heat transfer efficiency of the heat exchanger.

13.Card-issued high-efficiency heat exchanger

The hairpin type high-efficiency heat exchanger is a new type of high-efficiency heat exchanger with compact structure and high heat transfer performance. It is suitable for the occasions where the medium flow rate of the shell side medium is small, the medium viscosity is large, it is easy to coke and scale, and it needs to be cleaned regularly. The hairpin type structure can draw the U-shaped tube bundle from the two shells, which is convenient for cleaning. The diameter of the heat exchanger shell is usually relatively small.

Excerpt from:刘民强 压力容器人