CN108007244A - A kind of spiral plug-flow passage plate heat exchanger - Google Patents

Abstract

The invention relates to a plate heat exchanger with a spiral push flow channel, which is composed of a heat exchange core body, an inlet diversion section, an outlet diversion section, a hot fluid inlet and outlet, and a cold fluid inlet and outlet. The heat exchange core of the heat exchanger adopts the flow channel of spiral parallel countercurrent heat exchange, which is beneficial to make the heat exchange of the fluid in the heat exchanger more sufficient; the inlet guide section and the outlet guide section adopt straight-in and straight-out and side-in and side-out The staggered structure is conducive to making the fluid distribution in the heat exchanger more uniform; the inlet and outlet of the cold and hot fluids adopt a square-circle transition structure, which is conducive to making the structure of the heat exchanger more compact. The invention can realize solid two-dimensional heat conduction, reduce thermal resistance of heat conduction, increase heat transfer between fluids on both sides, increase heat transfer area of heat exchanger, improve compactness of heat exchanger, improve overall efficiency of heat exchanger, and improve thermal stress The deformation caused by concentrated distribution improves the safety performance of the heat exchanger and prolongs the service life.

Description

A spiral plug flow channel plate heat exchanger

technical field

The invention relates to a plate heat exchanger used in liquefied natural gas, petroleum, chemical industry, refrigeration, nuclear energy and other industries, in particular to a spiral channel plate heat exchanger.

Background technique

Heat exchanger is an important heat exchange equipment widely used in petrochemical, energy, metallurgy, refrigeration, nuclear energy and other industrial fields. Due to its mature manufacturing process, compact structure, and high heat transfer efficiency, plate heat exchangers occupy a large proportion of heat exchange equipment. In a traditional plate heat exchanger, two layers of fluid, cold and hot, exchange heat through the wall of the heat exchange plate. Increase the degree of fluid turbulence to achieve the purpose of heat transfer enhancement.

The traditional plate heat exchanger consists of a combination of base plate and fins to form a fluid channel. It is mainly used in heat exchange equipment for Rankine cycle, Brayton cycle, and Stirling cycle. The design purpose of different rib structures is to increase heat transfer as much as possible. , reducing drag loss. There are many problems in the current traditional plate heat exchange equipment, such as: ①The cold and hot fluid channels arranged in rows have one-dimensional heat conduction, and the utilization rate of the heat exchange area is low; ②Complicated fins disturb the flow to enhance heat transfer, but the resistance loss is too large; ③The brazing joint is welded by dissimilar materials, and the thermal expansion stress under high temperature conditions makes the material prone to creep, which in turn blocks some channels, reducing heat exchange efficiency and safety.

Contents of the invention

In order to overcome the above disadvantages, the object of the present invention is to provide a spiral channel plate heat exchanger structure, in which the fluid on the cold side and the fluid on the hot side in the heat exchange plate flow coaxially and spirally. The principle is to improve the flow dead zone caused by the dead angle in the flow channel, and the flow cross section remains unchanged, thereby reducing the overall resistance, improving the utilization rate of the effective heat exchange area, and improving the overall efficiency of the heat exchanger. There are different cold and hot fluid inlet and outlet guide sections arranged at the inlet and outlet, so that the fluid is arranged in a countercurrent heat exchange; at the same time, the use of square and circular transition inlets and outlets can effectively improve the compactness.

Technical scheme of the present invention is realized like this:

A spiral plug flow channel plate heat exchanger, including a heat exchange core, an inlet guide section, an outlet guide section, a hot fluid inlet, a hot fluid outlet, a cold fluid inlet, and a cold fluid outlet, and a cold fluid channel in the heat exchange core Arranged spirally in parallel with the hot fluid channel along the axis, the axis is the center horizontal line of the channels on both sides, the axes of the fluid channels on both sides are parallel and the distance is kept constant; at the connection between the inlet guide section and the heat exchange core, the cold fluid channel and the hot fluid The channels are longitudinally spaced; in the middle of the heat exchange core, the cold fluid channel and the hot fluid channel are arranged horizontally or vertically; at the connection between the outlet guide section and the heat exchange core, the cold fluid channel and the hot fluid channel are longitudinally spaced Arrangement; the cold fluid channel and the hot fluid channel in the heat exchange core keep the same distance and flow in the opposite direction, and the cold and hot fluid of the heat exchanger are arranged in countercurrent flow; the inlet guide section and the outlet guide section are arranged with direct current guide channels and curved Angular diversion channel, hot fluid goes straight in and out, and cold fluid goes in and out sideways.

The cold fluid channel and the hot fluid channel in the heat exchange core are arranged in pairs in the flow direction around the same central axis, and the central axis is the horizontal line connecting the midpoints of the two channels. The relative positions of the cold and hot channels are constantly changing, but they are relatively The axes of the adjacent cold and hot aisles are parallel and the spacing is kept constant.

The flow direction of the cold fluid channel and the hot fluid channel in the heat exchange core is a half cycle or an integer multiple of a half cycle.

In the heat exchange core, the cross-sections of the cold fluid channel and the hot fluid channel are constantly changing along the flow direction, and the flow direction of the cold and hot fluid in the channel is opposite or the same, but the heat exchanger is arranged countercurrently or downstream.

The inlet diversion section and the outlet diversion section are arranged with a direct flow diversion channel and a curved diversion channel, the hot fluid goes straight in and out, and the cold fluid goes in and out at the side.

The hot fluid inlet, hot fluid outlet, cold fluid inlet and cold fluid outlet are compact square-circle transition structures and are connected with the diversion section.

Advantage and effect of the present invention relative to prior art are:

①Improve heat transfer efficiency: the cold-side fluid and hot-side fluid channels are helically interlaced, and the solid cross-section along the flow direction realizes the expansion from one-dimensional heat conduction to two-dimensional heat conduction.

②Improve the utilization rate of effective heat transfer area: the temperature difference between the cold side fluid and the hot side fluid changes along the direction of the partition wall, the heat transfer area within the same volume increases, and the heat transfer driving force is improved.

③Reduce channel resistance: The fluid on the cold side and the fluid on the hot side advance in the form of spiral plug flow, and there are no spoiler ribs along the way to change the direction of fluid movement.

④ Balanced stress distribution: The fluid on the cold side and the fluid on the hot side transition smoothly along the passage, avoiding plastic deformation that may occur in sharp corners or flow dead zones.

In summary, the present invention has the following advantages:

① The present invention can reduce the heat conduction resistance;

②The present invention can improve the heat transfer capacity of the spacer fluid;

③ The present invention can improve the overall performance of the heat exchanger;

④ The present invention can improve the compactness of the heat exchanger and increase the utilization rate of the effective heat transfer area.

Description of drawings

Fig. 1 is a schematic diagram of the overall structure of the heat exchanger of the present invention.

Fig. 2 is a schematic diagram of the arrangement structure of hot fluid channels and cold fluid channels in the present invention.

Fig. 3 is a schematic diagram of the cross-sectional layout of the core body along the flow channel in the present invention.

Fig. 4 is a schematic diagram of the structural unit of the core single-layer plate in the present invention.

Fig. 5 is a schematic diagram of the channel unit of the inlet and outlet diversion section of the heat exchanger in the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

The invention includes a heat exchange core body, an inlet guide section, an outlet guide section, a hot fluid inlet, a hot fluid outlet, a cold fluid inlet and a cold fluid outlet. The adjacent cold and hot fluid channels in the heat exchange core take the center horizontal line of the distance as the axis, and extend spirally and staggered. , The structure of the outlet guide section is a vertical staggered arrangement of direct-flow guide plates and angled guide plates to ensure that the hot fluid goes straight in and out, and the cold fluid enters and exits sideways. One side of the guide section is connected to the heat exchange core. One side is connected to the inlet and outlet of the hot and cold fluid; the inlet and outlet of the hot and cold fluid are of a transitional structure, which can effectively reduce the volume of the spiral plate heat exchanger.

Adjacent cold fluid and hot fluid passages are helically and alternately arranged, and the helical axis is the axis along the flow direction at the midpoint of the distance between the adjacent cold and hot fluid passages, forming a half-period or an integral multiple of half-period helical passages.

The inlet diversion section and the outlet diversion section connected to the heat exchange core and the fluid inlet and outlet, the direct flow channel arranged on the hot side is in the shape of a "one", and the channel with curved angles on the cold side is arranged in a vertical "Z" shape. The entire core The body forms a counter-current heat exchange arrangement.

As shown in Figure 1, a new type of spiral plug-flow channel plate heat exchanger includes: a heat exchange core 1, the inlet diversion section 2 in front of the core body, and the outlet diversion section 3 behind the core body. The hot-side inlet 4 and the cold-side outlet 7 are connected to the inlet guide section 2, and the hot-side outlet 5 and the cold-side inlet 6 are connected to the outlet guide section 3, so as to ensure that the fluids on both sides perform countercurrent heat exchange in the heat exchange core 1 .

Referring to Figure 2, the adjacent cold-side channels 8 and hot-side channels 9 in the heat exchange core 1 are spirally arranged, and the spiral axis is the horizontal line at the midpoint of the two channels at the entrance. Fluid inlet 6, outlet 7 and thermal fluid inlet 4, outlet 5.

Referring to Figure 3, along the direction of fluid flow, the arrangement of cold and hot fluids in the cross-section is constantly changing, and the direction of temperature difference is constantly changing, realizing two-dimensional heat conduction in solids. At both ends of the heat exchange core 1 , the cold fluid channels 8 and the hot fluid channels 9 are longitudinally spaced apart; in the middle of the heat exchange core 1 , the cold fluid channels 8 and the hot fluid channels 9 are horizontally spaced apart.

Referring to FIG. 4 , the heat exchange core 1 is a single-layer plate unit structure arranged at regular intervals in forward and reverse directions, and the channels of adjacent heat exchange plates form cold fluid channels 8 and hot fluid channels 9 .

Referring to Figure 5, the structure of the inlet diversion section 2 is similar to that of the outlet diversion section 3. The straight-in and straight-out channels form a "one"-shaped flow of hot fluid from the inlet 4 to the outlet 5, and the side-in and side-out channels form the flow of cold fluid from the inlet 4 to the outlet 5. Import 6 to 7 vertical "Z" flow.

The working process of the heat exchanger is as follows: the hot fluid enters the inlet guide section 2 from the inlet 4, flows through the heat exchange core 1 through the hot fluid channel 9, and goes straight in and out through the outlet guide section 3 to the hot fluid outlet 5; The fluid enters the outlet guide section 3 from the inlet 6, flows into the heat exchange core 1 through the cold fluid channel 8, and flows in and out through the inlet guide section 2 to the cold fluid outlet 7. The hot and cold fluid in the heat exchange core 1 In the paired helical channel, the push flow flows forward to complete the counter heat transfer.

Claims (6)

1. A plate heat exchanger with a spiral push flow channel, comprising a heat exchange core (1), an inlet diversion section (2), an outlet diversion section (3), a thermal fluid inlet (4), a thermal fluid outlet (5 ), the cold fluid inlet (6) and the cold fluid outlet (7), which are characterized in that: the inner cooling fluid channel (8) and the hot fluid channel (9) of the heat exchange core (1) are arranged in parallel in pairs along the axis, and the axis is the horizontal line of the center of the channels on both sides, the axes of the fluid channels on both sides are parallel and the distance is kept constant; at the junction of the inlet guide section (2) and the heat exchange core (1), the cold fluid channel (8) and the hot fluid channel (9) are longitudinally spaced; in the middle of the heat exchange core (1), the cold fluid channel (8) and the hot fluid channel (9) are arranged horizontally or vertically at intervals; at the outlet guide section (3) and the heat exchange core (1 ), the cold fluid channel (8) and the hot fluid channel (9) are longitudinally spaced apart; The cold and hot fluids of the heat exchanger are arranged in counter flow as a whole. 2. The spiral plug flow channel plate heat exchanger according to claim 1, characterized in that: the cold fluid channel (8) and the hot fluid channel (9) in the heat exchange core (1) are in pairs in the flow direction Arranged helically and staggered around the same central axis, the central axis is the horizontal line connecting the midpoints of the two channels, the relative positions of the hot and cold channels are constantly changing, but the axes of adjacent hot and cold channels are parallel and the spacing remains constant. 3. The spiral plug flow channel plate heat exchanger according to claim 1, characterized in that: the cold fluid channel (8) and the hot fluid channel (9) in the heat exchange core (1) are half cycle or half cycle along the flow direction. Integer multiples of the period. 4. The spiral plug flow channel plate heat exchanger according to claim 1, characterized in that: in the heat exchange core (1), the cross sections of the cold fluid channel (8) and the hot fluid channel (9) are aligned along the flow direction The distribution is constantly changing, and the hot and cold fluids in the channel flow in the opposite or the same direction, but the heat exchanger as a whole is arranged in countercurrent or downstream. 5. The spiral plug flow channel plate heat exchanger according to claim 1, characterized in that: the inlet guide section (2) and the outlet guide section (3) are arranged with a straight flow guide channel and a curved guide channel , the hot fluid goes straight in and out, and the cold fluid goes in and out sideways. 6. The spiral plug flow channel plate heat exchanger according to claim 1, characterized in that: the hot fluid inlet (4), the hot fluid outlet (5), the cold fluid inlet (6) and the cold fluid outlet (7) are The compact square-circle transition structure is connected with the diversion section.