The brazed plate heat exchanger is a new type of high-efficiency heat exchanger made up of a series of metal sheets with a certain corrugated shape. Thin rectangular channels are formed between the various plates, and heat exchange is carried out 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 has a tendency to replace shell-and-tube heat exchangers within the applicable range.
How to test the heat transfer effect of brazed plate heat exchanger?
1. If it is due to fouling, you can measure the inlet and outlet temperature and flow rate of the hot fluid and cold fluid, and calculate the heat transfer efficiency. If the efficiency is too low, it means too much fouling;
2. If it is because of the leakage of the heat exchanger, you can take a sample from the cold fluid and measure the concentration to see;
3. Check whether the temperature difference between the inlet and outlet water meets the design requirements at the time, and check the pressure gauge to see if the pressure drop is within the allowable range.
Heat transfer characteristics of brazed plate heat exchanger:
Brazed plate heat exchangers can be used for heating, industrial cooling, oil compressor and compressor oil cooling, air conditioning, frozen food, chemical refrigeration, water cooling, drinking water treatment, wastewater treatment, heat recovery, etc.
In terms of operation and maintenance, if there are particulate matter in the water, a filter should be used. Reverse washing with water can remove most of the soft particulate matter. The compact brazed plate heat exchanger should be reverse washed with citric acid or other acid that does not corrode copper and stainless steel every 3 to 5 years.
The brazed plate heat exchanger has the advantages of no gaskets, no leakage, light weight, small size, low price, easy disassembly and installation, and high heat transfer efficiency. The structure can be applied to steam, water or process fluids and can be used under conditions such as extremely small temperature differences between the two fluids.
The brazed plate heat exchanger consists of stainless steel plates with efficient heat transfer surfaces. The stainless steel plates are brazed with copper with a purity of 99% at high temperatures to obtain a tight, leak-proof and strong heat exchanger. The compact brazed plate heat exchanger is designed to consist of a maximum of 20 stainless steel corrugated plates, and each second end plate is turned upside down to form a large number of contact points between all the plates. During brazing, the contact points are also welded together to form a compact plate, so that almost all the sheet structure materials (about 94% of the surface) can be used for heat transfer. The plate type forms two separate channels, in which the medium forms convective motion, which causes high turbulence in the channel system and obtains excellent heat transfer characteristics. Even at low speeds, the fouling will be kept at an absolute minimum.
Compact structure, easy installation, high heat transfer coefficient, low liquid stagnation, and thin plate (0.4mm).
The water consumption is small, and the heat exchange efficiency of the brazed plate heat exchanger is high, so that it only needs 1/3 of the cooling water flow of the shell-and-tube heat exchanger under the same cooling condition.
Welded plate heat exchangers are an evolution of plate heat exchangers, including brazed plate heat exchangers, semi-welded plate heat exchangers, and fully welded plate heat exchangers. Welding technology is used to connect corrugated metal plates, and part or all of the sealing gaskets are replaced to reduce or eliminate the restrictions on temperature, pressure and other parameters of the dangerous medium generated by the sealing gaskets.
Semi-welded plate heat exchanger is a kind of plate group that uses two plates to be joined along the sealing groove by overlapping welding method. The plate group and the other plate group are sealed by sealing gaskets, in the form of alternate stacking. A heat exchanger composed of a fixed compression plate and a movable compression plate. In each plate group, the non-hazardous medium flows on the side of the gasket, and the dangerous medium flows in the middle of the welded plate. Through the alternate gasket and welding process combination, it is ensured that the medium will not be mixed. There is a unique sealing system, which retains the advantages of disassembly and replacement of the plate heat exchanger and still has a relatively long service life.
Brazed plate heat exchangers and fully welded plate heat exchangers are somewhat similar in structure. Both use welding to connect the plates and completely eliminate the sealing gasket. The difference is that the fully welded plate heat exchange The plates of the heat exchanger are welded by argon arc welding, while the plates of the brazed plate heat exchanger are welded by high-temperature fusion of copper foil, in addition to retaining the inherent advantages of plate heat exchangers such as small footprint and high heat exchange efficiency. outer. Since the sealing gasket is completely eliminated, there are no longer too many requirements for the corrosiveness, temperature, and pressure of the heat exchange medium, and the scope of application is increased. Plate heat exchangers have been widely used in metallurgy, mining, petroleum, chemical, electric power, medicine, food, chemical fiber, paper, textile, shipping, heating and other sectors. They can be used for heating, cooling, evaporation, condensation, sterilization, and waste heat. Various situations such as recycling. It has broad market prospects and development potential. Expand production capacity, produce more products with limited resources, and help companies gain a larger market share in the heat exchange industry.
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