Plate heat exchanger is a highly efficient heat exchange system comprised of a series of metal sheets with a specific corrugated shape. These sheets are arranged to form thin rectangular channels that enable efficient heat exchange.
These industrial plate heat exchangers find extensive use across a wide range of industries such as chemical, petrochemical, electric power, nuclear power, light industry, food, medicine, machinery, heating and cooling, shipping, metallurgy, mining, driving power, and military. They meet the diverse technological requirements of these industries, including heating, cooling, evaporation, condensation, and waste heat recovery of process media.
The plate heat exchanger is a highly efficient heat exchange system consisting of multiple metal sheets with specific corrugations. The arrangement of these sheets creates thin rectangular channels that facilitate effective heat exchange.
There are primarily two types of plate heat exchangers - detachable plate heat exchangers and fully welded plate heat exchangers. Fully welded plate heat exchanger employs welded seals design, eliminating the pressure and temperature limitation of detachable plate heat exchangers with rubber gasket seals and improving equipment reliability.
There are three types of plates used in these heat exchangers - herringbone corrugated plates, horizontal straight corrugated plates, and nodular plates.
A plate-fin heat exchanger consists of three main components - fins, partitions, and seals. The fins are placed on one partition, then another partition is placed on top, and both sides are enclosed by seals to form a channel. These channels are stacked and arranged in various configurations and then brazed together to form the core-plate bundle unit of the plate-fin heat exchanger.
Plate-fin heat exchanger belongs to dividing wall type heat exchanger. In terms of the heat transfer mechanism, its biggest feature is its extended secondary heat transfer surface, so the heat transfer process is not only carried out on the primary heat transfer surface but also on the secondary heat transfer surface simultaneously, and the secondary heat transfer area is larger, usually 1.5 - 3 times the primary heat transfer surface area. The plate-fin heat exchanger has the secondary heat transfer area, which is incomparable to other heat exchange equipment.
In 2007, Longhua Technology Group (Luoyang) Company established the Tubular Heat Exchanger Division. Based on the guiding ideology of "High Starting Point, High Standard, High Quality and Continuous Innovation", the plate heat exchanger company has accelerated the pace of technology industrialization and successfully launched a series of high-efficiency and compact plate heat exchanger products to meet the market demand, thereby providing clients with high cost-effective heat exchange solutions according to different process conditions (pressure, temperature, medium, etc.).
LHWP Series Fully-Welded Plate Heat Exchangers
LHWP-F - F-type Fully Welded Plate Heat Exchanger (WPHE of Flex Modal)
LHWP-R - R-type Fully Welded Plate Heat Exchanger (WPHE of Removable Modal)
LHWP-B - B-type Fully Welded Plate Heat Exchanger (WPHE of Compact Block Modal)
LHWPE - Fully Welded Plate Evaporator
LHWPR - Air Preheater/Regenerator (WPHE For Recover Energy)
Technical Data
Type | Maximum Design Pressure | Maximum Design Temperature | Maximum Heat Transfer Area | Plate Material | Detachable | Application | |||||
Liquid-liqui | Vapor-liquid | Gas-liquid | Gas-gas | Evaporation | Condensation | ||||||
LHWP-F F-type Fully Welded Plate Heat Exchanger WPHE of Flex Modal | 5.0MPa | 600℃ | 5000m2 | Stainless steel, titanium, 2205,254 etc. | √ | √ | √ | √ | √ | √ | |
LHWP-R R-type Fully Welded Plate Heat Exchanger WPHE of Removable Modal | 4.0MPa | 600℃ | 1000m2 | Stainless steel, titanium, 2205,254 etc. | √ | √ | √ | √ | √ | √ | |
LHWP-B B-type Fully Welded Plate Heat Exchanger WPHE of Compact Block Modal | 3.0MPa | 300℃ | 300m | Stainless steel, titanium, 2205,254 etc. | √ | √ | √ | √ | √ | √ | |
Structural form | Square shell for compact structure; connection by square flange, facilitating mechanical cleaning and maintenance; |
Design temperature | ≤ 300℃; |
Design pressure | ≤ 3.0 MPa; |
Plate material | stainless steel, titanium, 2205, 254, etc.; |
Plate thickness | 0.7 - 1.0 mm; |
Corrugated form | Fishbone shape, with bubble structure on both sides; |
Shell material | Carbon steel or other weldable materials; |
Process combination | Cross flow or reverse cross flow. |
LHWPE fully welded plate evaporator is one of the new products launched by the Company in recent years. Compared with tubular evaporator, LHWPE has many advantages such as high heat transfer efficiency, compact structure, and unique distributor design, which is more conducive to film evaporation and so on. Falling film evaporation and rising film evaporation can be realized.
Technical Data
Structural form | Square shell, connected by square flange, facilitating mechanical cleaning and maintenance; |
Design temperature | ≤ 300℃; |
Design pressure | ≤ 2.0 MPa;; |
Plate material | stainless steel, titanium, 2205, 254, etc.; |
Plate thickness | 0.7 - 1.0 mm; |
Corrugated form | Bubble structure on both sides, without dead angle for cleaning; |
Shell material | Carbon steel or other weldable materials. |
Structure Type | Structure Diagram | Description |
LHWP-F F-type Fully Welded Plate Heat Exchanger (Flex Modal) |
| It adopts conventional welding structure. |
LHWP-R R-type Fully Welded Plate Heat Exchanger (Removable Modal) |
| It adopts self-developed patented technology (PAT.NO200920088339.6)， Structural Characteristics: 1. The heat transfer core is composed of multiple groups of plate bundles inserted into each other, which can be disassembled for easier maintenance and cleaning. 2. The plate bundles are welded and connected with the header through the flat pipe, and the automatic welding of the weld seam is realized to the maximum extent, thus ensuring higher reliability. |
LHWP-B B-type Fully Welded Plate Heat Exchanger (Compact Block Modal) |
| Multiple square plate bundles are superimposed, so the structure is more compact. The medium inlet and outlet are connected by square flange. Cross flow or reverse cross flow can be realized. |
The plate-fin heat exchanger is characterized by its high heat exchange efficiency, small pressure drop, compact structure, small footprint, broad applicability, low metal consumption, and long service life.
Leakage Resistance: Due to its fully welded construction without the need for gaskets, the welded plate block heat exchanger boasts enhanced resistance to leakage, significantly reducing maintenance requirements.
High-Temperature and Pressure Durability: In comparison to traditional shell-and-tube heat exchangers, the PHE-type heat exchanger exhibits superior resistance to both high temperatures and pressures, ensuring reliable performance even in challenging environments.
Optimized Heat Exchange Efficiency: The absence of thermal resistance between fluids and plates contributes to exceptional heat exchange efficiency, allowing for optimal transfer rates.
Space-Efficient Design: Welded Plate Heat Exchangers feature a compact structure, occupying minimal space when compared to other heat exchanger types. This space efficiency is especially valuable in installations with spatial constraints.
Reliability Assurance: At Longhua, we uphold the highest standards of quality and safety. Our products undergo rigorous testing and adhere to certifications such as GRG, FDA, and SGS, ensuring reliability and meeting stringent industry requirements.
Each plate bundle is welded by two corrugated plates. One medium passes through the inner channel of the plate bundle, while another medium passes through the outer channel of the plate bundle, so the plate bundle is also called plate tube. The different corrugated forms of the plate can strengthen the flow disturbance in the corrugated flow channel, so that turbulence is formed at a very low Reynolds number, thus enhancing heat transfer. Compared with the heat exchange tube, its advantages are more significant.
For the same pressure loss, its heat transfer coefficient is 3-5 times higher than that of tubular heat exchanger, its floor area is one third of that of tubular heat exchanger, and its heat recovery rate can reach more than 90%.
Type | Heat Transfer Coefficient | Fouling Thermal Resistance | Pressure Drop | Structure Compactness | Weight | Floor Area | Investment Proportion |
Tubular Heat Exchanger | 1.0 | 1.0 | 1.0 | 78m2 /m3 | 1.0 | 1.0 | 1.0 |
Plate Heat Exchanger | 2.0~3.0 | 0.2~0.25 | 0.3~0.5 | 220m2 /m3 | 0.5 | 0.4~0.6 | 0.5~0.9 |
Plate heat exchanger products are highly efficient heat exchange solutions adapted to modern industrial requirements. With their exceptional heat transfer efficiency, small temperature difference heat exchange, compact structure, small footprint, flexible operation, and easy maintenance, these products are extensively used in several industries such as chemical, petrochemical, electric power, nuclear power, light industry, food, medicine, machinery, heating and cooling, shipping, metallurgy, mining, driving power, and military. They meet the diverse technological requirements of these industries, including heating, cooling, evaporation, condensation, and waste heat recovery of process media.
Plate heat exchanger is a kind of essential equipment in the cooling system of power plant, including oil cooler, closed circulating water cooler, flue gas heater, air preheater and so on according to the difference of application fields.
Air preheater (APH): It is an important supporting device in modern power plants burning fossil fuels. Using the high-temperature flue gas discharged from the boiler to preheat the combustion air can greatly improve the boiler efficiency.
Plate heat exchanger can be used in chemical industry, such as petrochemical, refining, textile, chemical fertilizer, acid and alkali factories.
