With the deepening of the theme of environmental protection and energy saving in the world, sustainable energy use is the starting point for the development of all new energy equipment.
The centralized transportation of the heating system can greatly reduce the amount of coal burned, relieve energy pressure, and can also meet the theme of world development.
The plate heat exchanger in heating equipment is an important part and plays an important role. The common plate heat exchangers in daily life mainly include the following types:
1. Spiral plate heat exchanger
Advantages: The spiral plate heat exchanger has a compact structure and a large heat transfer surface per unit volume.
The fluid allows a high flow rate in the spiral plate, and the fluid flows along the spiral direction, and the stagnant layer is thin, so the heat transfer coefficient is large and the heat transfer efficiency is high.
In addition, due to the high flow rate, dirt is not easy to stay.
Disadvantages: The spiral plate heat exchanger requires high welding quality and difficult maintenance.
Due to its heavy weight and poor rigidity, special attention should be paid to the transportation and installation of the spiral plate heat exchanger.
2. Flat heat exchanger
The plate heat exchanger is a new type of high-efficiency heat exchanger that is stacked by a series of metal sheets with a certain corrugated shape.
Thin rectangular channels are formed between the various plates, and heat exchange is performed through the half plates.
Compared with conventional shell-and-tube heat exchangers, its heat transfer coefficient is much higher under the same flow resistance and pump power consumption, and it tends to replace shell-and-tube heat exchangers within the applicable range.
3. Plate-fin heat exchanger
It consists of a bundle of heat exchange plates enclosed in a header box with inlets and outlets for cold and hot fluids.
The plate bundle is made of flat plates and corrugated fins alternately laminated and fixed by brazing. The cold and hot fluids flow through both sides of the plate to exchange heat, and the fins increase the heat transfer area, promote the turbulence of the fluid, and enhance the equipment.
The structure of the plate-fin heat exchanger is very compact, the heat transfer effect is good, and the working pressure can reach 15MPa.
However, its manufacturing process is complicated, the flow channel is small, and the internal leakage is not easy to repair, so it is limited to clean and non-corrosive fluids, such as heat exchangers for air separation.