阅读说明：本技术 一种用于防藻防垢的列管换热器 (Tube nest heat exchanger for preventing algae and scale ) 是由 文红军 宋晨 郭禹廷 赵雪梅 刘昊 付潇艺 国红 于 2020-07-13 设计创作，主要内容包括：本发明公开了一种用于防藻防垢的列管换热器,所述壳体内设有若干组折流板,每组折流板包括依次设置的小折流板和大折流板；所述壳体内还设有定距管,所述定距管依次穿过大折流板和小折流板；所述大折流板为圆环形,所述大折流板的外径与壳体的直径相等；所述小折流板为圆形；每组折流板内还设有若干导流板,所述导流板垂直固定在大折流板朝向出水口的一侧,所述导流板为弧形。本发明的装置使得列管换热器中的水能够不断改变水流方向,同时形成湍流,水流冲刷力度大,从而水对壳体内表面和换热管外表面的冲刷效果显著增加,防止藻类植物在换热器壳程侧内表面和换热管外表面的滋生和结垢的形成,从而使换热器壳程防藻防垢效果显著。(The invention discloses a shell-and-tube heat exchanger for preventing algae and scale, wherein a plurality of groups of baffle plates are arranged in a shell, and each group of baffle plates comprises a small baffle plate and a large baffle plate which are sequentially arranged; a distance tube is further arranged in the shell and sequentially penetrates through the large baffle plate and the small baffle plate; the large baffle plate is annular, and the outer diameter of the large baffle plate is equal to the diameter of the shell; the small baffle plate is circular; and a plurality of guide plates are also arranged in each group of baffle plates, the guide plates are vertically fixed on one side of the large baffle plate facing the water outlet, and the guide plates are arc-shaped. The device of the invention enables water in the tubular heat exchanger to continuously change the water flow direction, forms turbulence at the same time, and has large water flow scouring strength, thereby obviously increasing the scouring effect of the water on the inner surface of the shell and the outer surface of the heat exchange tube, preventing the breeding and scaling of algae on the inner surface of the shell side of the heat exchanger and the outer surface of the heat exchange tube, and further ensuring the shell side of the heat exchanger to have obvious algae-preventing and scale-preventing effects.)

1. A tube array heat exchanger for preventing algae and scale comprises a shell and a heat exchange tube bundle, wherein the heat exchange tube bundle is fixed on tube plates at two ends of the shell, and a water inlet and a water outlet are respectively arranged at two ends of the shell; the method is characterized in that: a plurality of groups of baffle plates are arranged in the shell, and the heat exchange tube bundle transversely passes through each group of baffle plates; each group of baffle plates comprises a small baffle plate and a large baffle plate which are sequentially arranged, and the large baffle plate is parallel to the small baffle plate; the section of the large baffle plate is circular, and the outer diameter of the large baffle plate is equal to the diameter of the shell; the cross section of the small baffle plate is circular, and the area of a circular ring formed between the circumference of the small baffle plate and the inner wall of the shell is equal to the area of the inner circle of the large baffle plate; the circle centers of the large baffle plate, the small baffle plate and the cross section of the shell are positioned on the same straight line; a plurality of guide plates are also arranged in each group of baffle plates, the guide plates are vertically fixed on one side of the large baffle plate facing the water outlet, and the guide plates are arc-shaped; the flow guide plate penetrates through the gap of the heat exchange tube bundle, one end of the flow guide plate is connected with the inner wall of the shell, and the other end of the flow guide plate is positioned on the inner circle of the large baffle plate; the shell is internally provided with at least three distance tubes, the distance tubes sequentially penetrate through the large baffle plate and the small baffle plate, one end of each distance tube is fixed on the tube plate close to one end of the water outlet of the shell, and the other end of each distance tube is fixed on the large baffle plate close to the water inlet of the shell.

2. The shell and tube heat exchanger of claim 1, wherein: the spacing between each set of baffles is the same.

3. The shell and tube heat exchanger of claim 2, wherein: the distances between the large baffle plate and the adjacent small baffle plates are the same.

4. The shell and tube heat exchanger of claim 1, wherein: three distance tubes are arranged in the shell, and the distances between the distance tubes and the adjacent distance tubes are equal.

5. The shell and tube heat exchanger according to claim 1 or 4, wherein: one end of the distance tube is fixed on the tube plate close to one end of the water outlet of the shell, and the other end of the distance tube is fixed on the large baffle plate close to the water inlet of the shell.

6. The shell and tube heat exchanger of claim 1, wherein: and 4-12 guide plates are arranged in each group of baffle plates.

7. The shell and tube heat exchanger according to claim 1 or 6, wherein: the arc-shaped opening directions of the guide plates are sequentially and uniformly distributed on the large baffle plate in the clockwise direction or the anticlockwise direction.

8. The shell and tube heat exchanger of claim 1, wherein: the interval between the guide plate and the small baffle plate is 0-100 mm.

9. The shell and tube heat exchanger of claim 8, wherein: the interval between the guide plate and the small baffle plate is 50 mm.

10. The shell and tube heat exchanger of claim 1, wherein: the distance between the other end of the guide plate and the circle center of the large baffle plate is more than 0mm and less than or equal to 10 mm.

Technical Field

The invention relates to the technical field of tube heat exchangers, in particular to a tube heat exchanger for preventing algae and scale.

Background

The shell-and-tube heat exchanger is favored in the industries of chemical industry, medicine, food and the like due to the advantages of simple and compact structure, low manufacturing cost and the like. The tube pass of the shell-and-tube heat exchanger is convenient to clean, and even if the tube pass is blocked, the shells at two ends are disassembled to be easily mechanically cleaned. But the shell-side of the shell-and-tube heat exchanger cannot be taken apart for mechanical cleaning. The water in the circulating water pond is often provided with a large amount of active microorganisms (such as algae) and suspended matters before entering the shell side, so that the large amount of active microorganisms are easily attached to the inner surface of the shell on the shell side and the outer surface of the heat exchange tube. Once a large amount of active microorganisms are attached in the shell pass, the active microorganisms can rapidly propagate and grow under the condition of proper temperature environment, so that the shell pass is easily blocked, the heat exchange efficiency is influenced, and even the heat exchanger loses the heat exchange effect. In addition, since the water of the circulating water tank contains a large amount of Ca²⁺、Mg²⁺Isocation and CO₃ ^2-、HCO₃ ^-When the shell side water flow rate is not high, the anions easily form scale on the inner wall of the shell and the outer wall of the heat exchange tube, and the heat exchange efficiency is influenced.

The baffle plate with the traditional structure can only enable water to flow to the position near the center from the inner wall of the shell in a one-way mode, the flow path of the water in the heat exchanger is short, the flow speed is low, and algae and water scale are easily formed on the inner wall of the shell and the outer surface of the heat exchange tube. Therefore, a plurality of spiral baffle plates appear in the following, for example, application number 201910498389 discloses a bent 3-minute spiral baffle plate heat exchanger, application number 201821969180 discloses a silicon carbide tubular heat exchanger with high heat exchange efficiency, and the heat exchanger uses the spiral baffle plates, but the heat exchanger is complex in manufacturing process and high in cost; the change of the water flow direction is limited, the water flow speed is unchanged, the scouring force is small, and the algae and scale removing effect is not very outstanding. Therefore, the tubular heat exchanger is needed, the water flow direction can be continuously changed through the improvement on the flow plate, the water flow scouring force can be increased, water forms turbulent flow between the inner surface of the shell side of the heat exchanger and the outer surface of the heat exchange tube, the algae and scale prevention effect is obvious, the manufacture is simple, and the manufacturing cost is low.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides a shell and tube heat exchanger for preventing algae and scale. Through the improvement to the baffler and introduction guide plate for water in the shell and tube heat exchanger can form the torrent, and the scouring strength is big, thereby increases the scouring effect of water to casing internal surface and heat exchange tube surface, prevents that the algae plant from breeding and the formation of scale deposit at heat exchanger shell side internal surface and heat exchange tube surface, thereby makes heat exchanger shell side algae prevention scale control effect show.

The invention is realized by the following technical scheme, and provides a tubular heat exchanger for preventing algae and scale, which comprises a shell and a heat exchange tube bundle, wherein the heat exchange tube bundle is fixed on tube plates at two ends of the shell, and a water inlet and a water outlet are respectively arranged at two ends of the shell; a plurality of groups of baffle plates are arranged in the shell, and the heat exchange tube bundle transversely passes through each group of baffle plates; each group of baffle plates comprises a small baffle plate and a large baffle plate which are sequentially arranged, and the large baffle plate is parallel to the small baffle plate; the section of the large baffle plate is circular, and the outer diameter of the large baffle plate is equal to the diameter of the shell; the cross section of the small baffle plate is circular, and the area of a circular ring formed between the circumference of the small baffle plate and the inner wall of the shell is equal to the area of the inner circle of the large baffle plate; the circle centers of the large baffle plate, the small baffle plate and the cross section of the shell are positioned on the same straight line; a plurality of guide plates are also arranged in each group of baffle plates, the guide plates are vertically fixed on one side of the large baffle plate facing the water outlet, and the guide plates are arc-shaped; the flow guide plate penetrates through the gap of the heat exchange tube bundle, one end of the flow guide plate is connected with the inner wall of the shell, and the other end of the flow guide plate is positioned on the inner circle of the large baffle plate; the shell is internally provided with at least three distance tubes, the distance tubes sequentially penetrate through the large baffle plate and the small baffle plate, one end of each distance tube is fixed on the tube plate close to one end of the water outlet of the shell, and the other end of each distance tube is fixed on the large baffle plate close to the water inlet of the shell.

Preferably, the spacing between each set of baffles is the same.

Preferably, the spacing between the large baffle and the adjacent small baffle is the same.

Preferably, three distance tubes are arranged in the shell, and the distances between the distance tubes and the adjacent distance tubes are equal. The distance tube not only can determine the distance between the baffle plates, but also can play a role in fixing the baffle plates.

Preferably, one end of the distance tube is fixed on the tube plate close to one end of the water outlet of the shell, and the other end of the distance tube is fixed on the large baffle plate close to the water inlet of the shell.

Preferably, 4-12 guide plates are arranged in each group of the guide plates. The quantity of the guide plates can be set according to the diameter of the heat exchanger shell, and the larger the diameter of the heat exchanger shell is, the more the quantity of the guide plates is.

Preferably, the arc-shaped opening directions of the guide plates are sequentially and uniformly distributed on the large baffle plates in the clockwise direction or the anticlockwise direction.

Preferably, the interval between the guide plate and the small baffle plate is 0-100 mm. Namely, when the guide plate can be fixed between the large baffle plate and the small baffle plate, the distance between the guide plate and the small baffle plate is 0 mm; the guide plate is only fixed on one side of the large baffle plate, and when a hole is formed between the guide plate and the small baffle plate, the distance between the guide plate and the small baffle plate is less than or equal to 100 mm. A heat exchange dead zone is easily formed behind the small baffle plate at a distance of 0mm, so that the heat exchange efficiency is influenced; too large a distance is not good for forming the vortex, and the effect of the invention is not achieved by affecting the heat exchange efficiency, so the most suitable distance is about 50 mm.

Preferably, the distance between the guide plate and the small baffle plate is 50 mm.

Preferably, the distance from the other end of the guide plate to the center of the large baffle plate is greater than 0mm and less than or equal to 10 mm. One end of the guide plate is fixed on the inner wall of the shell, and the other end of the guide plate is gathered towards the circle center of the large baffle plate, so that the guide effect is good. However, if the other end of the guide plate is positioned on the center of the circle of the large baffle plate, the guide plates are connected together, so that dead angles are easily formed among the guide plates, and the effects of algae prevention and scale prevention are influenced.

The invention has the beneficial effects that:

1. the device of the invention achieves the effect of algae prevention and scale prevention of the shell side of the heat exchanger by changing the structural shape of the baffle plate of the heat exchanger. The area of the baffle plate is divided into a plurality of small areas, the flowing direction of water is changed in each small area through a guide plate, the flowing direction of the water is changed from flowing towards the center to flowing towards the periphery again, and then the water flows towards the center, so that the water forms turbulent flow between the inner surface of the shell side of the heat exchanger and the outer surface of the heat exchange tube. Due to the formation of turbulent flow, the flow direction of water is changed, the flow path of the water is lengthened, the flow velocity of the water is obviously improved, and the scouring force of the water is increased, so that the scouring effect of the water on the inner surface of the shell and the outer surface of the heat exchange tube is increased, the breeding and scaling of algae on the inner surface of the shell side of the heat exchanger and the outer surface of the heat exchange tube are prevented, and the shell side algae-preventing and scale-preventing effects of the heat exchanger are remarkable.

2. The device of the invention has simple structure, the large baffle plate, the small baffle plate and the guide plate are easy to manufacture and simple to install, compared with the spiral baffle plate, the manufacturing cost and the installation cost are both much lower, and the whole manufacturing cost of the tubular heat exchanger is low.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is a diagram showing the flow direction of water in a shell of a conventional heat exchanger (the flow direction of water is shown by arrows, and a heat exchange tube bundle is omitted on a large baffle plate and a small baffle plate);

FIG. 3 shows the direction of water flow in the shell of the present invention (the dotted lines and arrows indicate the direction of water flow, note that the heat exchange tube bundle is omitted on the large baffle plate);

FIG. 4 is a schematic structural view of the interior of the shell with the heat exchange tube bundle omitted;

FIG. 5 is a schematic structural view of the distance tubes and the large and small baffles (the heat exchange tube bundles are omitted on the large and small baffles);

shown in the figure:

1. the heat exchanger comprises a shell, 2 parts of a large baffle plate, 3 parts of a small baffle plate, 4 parts of a heat exchange tube bundle, 5 parts of a guide plate, 6 parts of a distance tube, 7 parts of a tube plate, 8 parts of a water inlet and 9 parts of a water outlet.

Detailed Description

It should be noted that the following detailed description is exemplary and is intended to provide further explanation of the disclosure. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs.

As mentioned in the background of the invention, the baffles in prior art tube and tube heat exchangers are generally circular or spiral, and by modifying the baffles, the flow rate of the water in the shell may be changed while the direction of the water flow is substantially unchanged. Dead angles still exist in the shell, and the inner wall of the shell and the tube bundle cannot be effectively washed.

Based on the above, the invention provides a tube array heat exchanger for algae prevention and scale prevention, as shown in fig. 1, the tube array heat exchanger comprises a shell 1 and a heat exchange tube bundle 4, the heat exchange tube bundle 4 is fixed on tube plates 7 at two ends of the shell 1, and a water inlet 8 and a water outlet 9 are respectively arranged at two ends of the shell 1; a plurality of groups of baffle plates are arranged in the shell 1, and the heat exchange tube bundle 4 transversely penetrates through each group of baffle plates; each group of baffle plates comprises a small baffle plate 3 and a large baffle plate 2 which are sequentially arranged, and the large baffle plate 2 is parallel to the small baffle plate 3; the section of the large baffle plate 2 is circular, and the outer diameter of the large baffle plate 2 is equal to the diameter of the shell 1; the section of the small baffle plate 3 is circular, and the area of a circular ring formed between the circumference of the small baffle plate 3 and the inner wall of the shell 1 is equal to the area of the inner circle of the large baffle plate 2; the circle centers of the large baffle plate 2 and the small baffle plate 3 and the section of the shell 1 are positioned on the same straight line; a plurality of guide plates 5 are also arranged in each group of baffle plates, the guide plates 5 are vertically fixed on one side of the large baffle plate 2 facing the water outlet 9, and the guide plates 5 are arc-shaped; the flow guide plate 5 penetrates through the gap of the heat exchange tube bundle 4, one end of the flow guide plate 5 is connected with the inner wall of the shell 1, and the other end of the flow guide plate is positioned on the inner circle of the large baffle plate 2; at least two distance tubes 6 are further arranged in the shell 1, the distance tubes 6 sequentially penetrate through the large baffle plate 2 and the small baffle plate 3, and two ends of each distance tube 6 are fixed on tube plates 7 at two ends of the shell 1.

The spacing between each set of baffles is the same. The distances between the large baffle plate 2 and the adjacent small baffle plates 3 are the same.

Three distance tubes 6 are arranged in the shell 1. The distance between the distance tube 6 and the adjacent distance tube 6 is equal. One end of the distance tube 6 is fixed on the tube plate 7 at one end of the water outlet 9 of the shell 1, and the other end is fixed on the large baffle plate 2 close to the water inlet 8. Each group of baffle plates is internally provided with 4-12 guide plates 5. The arc-shaped opening directions of the guide plates 5 are sequentially and uniformly distributed on the large baffle plate 2 in a clockwise/anticlockwise direction. The interval between the guide plate 5 and the small baffle plate 3 is 0-100 mm. The distance between the guide plate 5 and the small baffle plate 3 is 50 mm. The distance between the other end of the guide plate 5 and the center of the large baffle plate 2 is more than 0mm and less than or equal to 10 mm.

The shell-and-tube heat exchanger can change the flow direction of water, the flow direction of the water in the shell 1 of the existing shell-and-tube heat exchanger is shown in figure 2, one baffle plate is changed into a group of baffle plates, and each group of baffle plates is provided with a circular large baffle plate 2 and a circular small baffle plate 3; because in the casing 1, big baffling board 2 and little baffling board 3 interval in proper order set up, rivers all can change through every baffling board rear direction, can carry out no dead angle with tubular heat exchanger and erode. Meanwhile, the guide plates 5 are arranged in each group of baffle plates, the guide plates 5 are vertically fixed on the large baffle plates 2, water flows enter spaces formed between the guide plates 5 after passing through the large baffle plates 2, and under the action of the arc-shaped guide plates 5, the direction of the water flow is changed from flowing towards the center to flowing towards the center and then flows back to the inner wall of the shell 1 (as shown in figure 3), so that the water forms turbulent flow between the shell side inner surface of the heat exchanger and the outer surface of the heat exchange tube. Due to the formation of turbulent flow, the flow direction of water is changed, the flow path of the water is lengthened, the flow velocity of the water is obviously improved, and the scouring force of the water is increased, so that the scouring effect of the water on the inner surface of the shell and the outer surface of the heat exchange tube is increased, the breeding and scaling of algae on the inner surface of the shell side of the heat exchanger and the outer surface of the heat exchange tube are prevented, and the shell side of the heat exchanger achieves the algae-preventing and scale-preventing effects. Because the area of the ring that forms between the circle of little baffling board 3 apart from casing 1 inner wall equals with the area of the interior circle of big baffling board 2, through setting up like this, the flow of the water through big baffling board 2 and little baffling board 3 at every turn is unchangeable, the direction constantly changes, the velocity of flow of water has been increaseed through setting up of guide plate 5, all can accelerate rivers through guide plate 5 at every turn in other words, make the scouring strength of rivers strengthen, intangible a plurality of rivers accelerators of formation. Not only makes rivers wash away and does not have the dead angle, has still increaseed the scouring force degree, effectual algae prevention scale control.