CN201569352U - All-welded dual waveform cross flow type plate type heat exchanger plate bundle - Google Patents

Abstract

The utility model discloses an all-welded dual waveform cross flow type plate type heat exchanger plate bundle, comprising an upper heat exchange plate, a middle heat exchange plate and a lower heat exchange plate overlapped at intervals in thickness direction; vertical waveforms are overlapped vertically on horizontal waveforms; the horizontal or vertical waveform is triangle function waveform, trapezoidal waveform, triangular waveform or composite shaped form formed by connecting multiple sections of curves; a longitudinal flow passage is formed by turning over and welding the sides of the middle plate at both sides of the middle plate and the sides of the lower plate at both sides of the lower plate; a transverse plane flow passage is formed by turning over and welding the transverse sides of the middle plate at the front and the rear sides of the middle plate and the transverse sides of the upper plate at the front and the rear sides of the upper plate; the flowing surface area of heat exchange of fluid and the disturbance of the fluid are increased, the protruded waveforms vertical to each other absorb the deformation due to temperature, the resistance to deformation of the heat exchange plates is increased, and the resistance to compression of the heat exchange plates and the ability for preventing deposition of dirt are improved; compared with the prior art, the fluid resistance of the plate type heat exchanger is decreased by 10-20%, and the total heat transfer coefficient is increased by 1.5 times.

Description

Fully welded double wave cross-flow plate heat exchanger plate bundle

technical field

The utility model relates to a plate heat exchanger for energy exchange between medium-low pressure and high-temperature gas-gas and gas-liquid, which is applied to tail gas energy recovery or gas cooling of incinerators, flue gas, etc., and can also be used in petroleum, chemical industry and energy recovery in other fields such as energy.

Background technique

Plate heat exchangers are mainly used in places where the pressure difference is not high and the heat transfer coefficient is large. At present, the commonly used detachable plate heat exchangers are generally used in places where the temperature of the heat exchange medium is lower than 180°C due to the temperature resistance limit of the sealing material. . The heat exchange effect of a plate heat exchanger is mainly determined by the shape and flow pattern of the heat exchange plate. At present, from the shape of the heat exchange plate of the plate heat exchanger, there are mainly "herringbone" and wave forms.

Patent No. 200820112798.9, titled "A New Type of Cross-Flow Plate Heat Exchanger", discloses that the heat exchange core is composed of a group of rectangular heat exchange fins stacked and connected in the thickness direction, wherein, between two adjacent rectangular heat exchange fins The two corresponding sides on the same side in the horizontal X direction are folded and snapped together to form an X-direction channel, and the two corresponding sides on the same side in the horizontal Y direction are connected to the upper and lower layers of rectangular heat exchange fins respectively. The corresponding edges of the corresponding edges are folded and sealed to form two Y-direction channels, so as to form a cross-flow air channel in which the X-direction channel and the Y-direction channel overlap each other layer by layer; each layer of X-direction channels and each layer of Y-direction channels In the channel, the convex points or/and ribs formed by stamping between adjacent rectangular heat exchange fins are supported in the channel height direction to form the channel space. The disadvantages of this structure are: the channel space is separated by bumps or/and ribs, the ability to withstand the pressure of the fluid is poor, and the heat transfer efficiency is not high.

Contents of the invention

The purpose of this utility model is to overcome the shortcomings of the above-mentioned prior art and provide a fully welded double-wave cross-flow plate heat exchanger plate bundle with high heat transfer coefficient and strong pressure resistance.

The technical scheme adopted by the utility model is: the upper plate, the middle plate and the lower plate are composed of three heat exchange plates stacked at intervals in the thickness direction, and the structures of the upper plate, the middle plate and the lower plate are superimposed on the horizontal corrugated shape The vertical corrugated shape, the horizontal or vertical corrugated shape is a trigonometric function waveform, a trapezoidal waveform, a triangular waveform or a compound curve formed by connecting multiple curves.

The side edges of the middle plate on both sides of the above-mentioned middle plate and the side edges of the lower plate on both sides of the lower plate are welded to form a longitudinal flow channel; Post-welding forms the transverse runners.

The beneficial effects of the utility model are:

1. The lateral flow fluid is disturbed by the transverse wave, and the vertical flow fluid is disturbed by the vertical wave, which not only increases the heat exchange surface area of the fluid flow, achieves the purpose of compact structure, but also increases the disturbance of the fluid, so that the two heat exchange fluids are both It can achieve the effect of turbulent heat transfer at low Reynolds number.

2. The uplifted mutually perpendicular waveforms can absorb the deformation caused by temperature difference, which is beneficial to increase the anti-deformation ability of the heat exchange plate, and improve the anti-compression and anti-dirt deposition ability of the heat exchange plate.

3. The fluid flow rate is slow, which reduces the resistance drop of the fluid. Compared with the plate heat exchanger in the prior art, the resistance is reduced by 10-20%, and the overall heat transfer coefficient is increased by 1.5 times.

Description of drawings

The utility model will be described in further detail below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a three-dimensional schematic diagram of the structure of the utility model.

Fig. 2 is a schematic diagram of the cross-sectional shape of Fig. 1 in the longitudinal or transverse direction,

In the figure: 1. lower board; 2. middle board; 3. upper board; 4. upper board lateral side; 5. middle board side; 6. lower board side; 7. middle board lateral side.

Detailed ways

As shown in Figure 1, the utility model is composed of three heat exchange plates, the upper plate 3, the middle plate 2 and the lower plate 1, which are stacked at intervals in the thickness direction, and the upper plate 3, the middle plate 2 and the lower plate 1 are all integral Rectangular flat stamping forming. As shown in Figure 2, the stamping structural shape of each plate is a vertical corrugated shape superimposed on the basis of the horizontal corrugated shape. The shape of the horizontal or vertical corrugated corrugations is a trigonometric function waveform, a trapezoidal waveform, or a triangular waveform or a multi-segment curve connection. into a compound curve.

There are sides 5 of the middle plate on both sides of the middle plate 2, and sides 6 of the lower plate on both sides of the lower plate 1, and the sides 5 of the middle plate and the sides 6 of the lower plate are welded together after flanging to form the lower plate 1 and the middle plate 2, which is the longitudinal channel (vertical direction) of the medium a shown in Figure 1. The middle plate 2 has a middle plate transverse edge 7 on the front and rear sides, and the upper plate transverse edge 4 is arranged on the front and rear sides of the upper plate 3. The middle plate transverse edge 7 and the upper plate transverse edge 4 are flanged and then welded together to form the middle plate 2 and the upper plate. The space of the plate, which is the transverse channel (horizontal direction) of the medium b shown in Fig. 1 . The longitudinal channel of medium a and the transverse channel of medium b are perpendicular to each other, and the cross flow of cold and hot media passes through both sides of each plate respectively. When the medium passes through the mutually perpendicular concave-convex waveform space, the flow velocity can be slowed down, reducing the pressure of the fluid on the heat exchange plate.

The corrugations on the above-mentioned heat exchange plate make the fluid in each flow channel move along its own waveform, that is, the gas or liquid passing in the longitudinal flow channel of medium a is a transverse wave, and the gas or liquid passing in the transverse flow channel of medium b is The longitudinal wave, the gap between the two flow channels, and the amplitude and period of the longitudinal and transverse waves are determined by the properties of the two heat exchange media, that is, by the flow velocity and characteristics of the medium and the required flow resistance drop, so that the two heat exchange media are uniform To achieve turbulent flow state, so that the total heat transfer coefficient can be effectively improved.

An embodiment of the utility model is: when the medium is air-air heat exchange, the plate distance between the upper plate 3, the middle plate 2 and the lower plate 1 is 12-16mm, the waveform amplitude is 16-17mm, and the wavelength is 65-80mm As the optimum size, the heat transfer coefficient at this time is 37w/m ² ·k, which is 50% higher than that of conventional plate heat exchangers.

In the utility model, when the plate spacing is 30 mm, the waveform amplitude is 17 mm, and the wavelength is 80 mm, the fluid turbulence intensity reaches the maximum.

Claims (2)

1. full welded type double wave shape cross-current type plate type heat exchanger plate bundle, by upper plate (3), (1) three heat exchanger plates of middle plate (2) and lower plate at interval folded mutually composition on thickness direction, it is characterized in that: the structure of upper plate (3), middle plate (2) and lower plate (1) is in the horizontal ripple vertical moire shape that superposes in shape, and this level or vertical moire are shaped as the compound-curve that trigonometric function waveform, trapezoidal waveform, triangular waveform or multistage curve are formed by connecting.

2. full welded type double wave shape cross-current type plate type heat exchanger plate bundle according to claim 1 is characterized in that: the vertical runner of welding formation behind lower plate side (6) flange of the middle plate side (5) of plate (2) both sides and lower plate (1) both sides in described; Weld behind upper plate horizontal edge (4) flange of side before and after the middle plate horizontal edge (7) of side and the upper plate (3) before and after the middle plate (2) and form the plane of structure runner.

Images