Dripping liquid distribution type steam-water shell and tube heat exchanger

Abstract

The utility model discloses a dripping liquid distribution type steam-water shell-tube heat exchanger, and belongs to the technical field of heat exchange equipment. The shell-and-tube heat exchanger solves the problems that according to an existing shell-and-tube heat exchanger, the outer wall of a heat exchange tube bundle is prone to corrosion and scaling, cleaning is difficult, and then heat exchange efficiency is affected. The interior of the shell is divided into a steam distribution cavity, a heat exchange cavity and a condensate water collection cavity through two partition plates, a liquid inlet distribution cavity is arranged over the heat exchange cavity in a separated mode through a dripping liquid distribution plate, the multiple sets of heat exchange tube bundles are all arranged in the heat exchange cavity, and the two ends of each heat exchange tube bundle communicate with the steam distribution cavity and the condensate water collection cavity correspondingly. And the problems that the desulfurization slurry enters the heat exchange cavity due to poor control of the liquid level of the flash evaporation liquid, and the heat exchange tube bundle is scaled and corroded are effectively avoided. The mode that the liquid inlet distribution cavity is combined with the dripping liquid distribution plate is adopted, water to be heated conducts heat exchange wrapping on the heat exchange tube bundle in a turbulent flow mode, a heat transfer system of steam-water heat exchange is effectively enhanced, and the heat transfer performance is improved.

Description

Technical Field

[0001] The utility model relates to a drip liquid - distributing steam - water shell - and - tube heat exchanger, belonging to the technical field of heat - exchange equipment. Background Technique

[0002] The shell - and - tube heat exchanger is a common heat - exchange device in civil heating and industrial production, with an extremely wide range of application fields and is common in all walks of life. For example, in the chemical industry, the shell - and - tube heat exchanger is used for a large amount of heating, cooling and recovery of materials; in petrochemical production, the shell - and - tube heat exchanger is used to cool high - temperature heat - discharged liquid to below 20 °C to meet environmental protection requirements; in the power industry, the shell - and - tube heat exchanger is used for boiler feed - water and drain cooling, steam turbine condenser blowdown and heat recovery; in the pharmaceutical industry, the shell - and - tube heat exchanger is needed to cool the reaction system. In the boiler industry, as a heat - energy device, the boiler needs to use a large number of heat - exchange devices for heat transfer. The shell - and - tube heat exchanger can cool and pre - heat the boiler feed - water and drain water, improve the efficiency in continuous circulation, and thus reduce the energy consumption cost. In short, the shell - and - tube heat exchanger can play an important role in the heat - transfer process of various industries. Its high - efficiency and precise heat - exchange ability make it one of the most commonly used heat - exchange devices in all walks of life.

[0003] In the direct - flow heat - pump device in the power - plant waste - heat utilization system, a shell - and - tube heat exchanger is used as the steam - water heat - exchange device. The heating - circulating water is inside the tube bundle of the shell - and - tube heat exchanger, and the flash steam is outside the tube bundle. This heat - exchange method usually uses the way of wrapping the heat - exchange tube bundle with flash gas for heat conduction to the heating water inside the tube bundle. However, in the actual application process, there is a phenomenon that desulfurization slurry is injected into the shell - and - tube heat exchanger due to poor control of the desulfurization slurry liquid level. Due to the complex water quality of the desulfurization slurry, containing a large amount of salts and chemical components, it is extremely easy to cause corrosion and scaling problems on the outside of the heat - exchange tube bundle, seriously affecting the normal use of the equipment.

[0004] Moreover, since the scaling occurs outside the tube, it is usually necessary to open the shell - and - tube heat - exchange equipment for cleaning, making the cleaning very difficult, seriously affecting the heat - exchange efficiency of the heat exchanger, and making the maintenance of the equipment extremely complicated, increasing the equipment maintenance cost, seriously violating the relevant requirements in the "Several Opinions on Promoting Industrial Enterprises to Strengthen Management, Reduce Costs and Increase Efficiency" of the Ministry of Industry and Information Technology. Therefore, there is an urgent need for a steam - water shell - and - tube heat exchanger that can effectively reduce scaling and does not affect the heat - exchange efficiency. Content of the Utility Model

[0005] The utility model is to solve the above - mentioned technical problems, and further provides a drip liquid - distributing steam - water shell - and - tube heat exchanger.

[0006] The technical solution adopted by the utility model to solve the above - mentioned technical problems is as follows:

[0007] A dripping and liquid-distributing type steam-water shell-and-tube heat exchanger, comprising a shell, a dripping and liquid-distributing plate, two partition plates and several groups of heat exchange tube bundles. The interior of the shell is divided into a steam distribution cavity, a heat exchange cavity and a condensate collection cavity by the two partition plates. An inlet liquid distribution cavity is separated and arranged above the heat exchange cavity through the dripping and liquid-distributing plate. Several groups of heat exchange tube bundles are all arranged in the heat exchange cavity, and both ends of the heat exchange tube bundles are respectively communicated with the steam distribution cavity and the condensate collection cavity. A water inlet pipe is communicated and arranged at the top of the inlet liquid distribution cavity, a water outlet pipe is communicated and arranged at the bottom of the heat exchange cavity, a steam inlet is communicated and arranged with the steam distribution cavity, and a condensate outlet is communicated and arranged with the condensate collection cavity.

[0008] Further, the dripping and liquid-distributing plate includes a water distribution baffle and several liquid-distributing rib columns integrally fixed on the bottom end surface of the water distribution baffle. Among them, several liquid-distributing rib columns are arranged in one-to-one correspondence with several groups of heat exchange tube bundles below them. Several liquid-distributing holes and slits are formed in the water distribution baffle, and several liquid-distributing holes and slits are arranged alternately with several liquid-distributing rib columns along the arrangement direction of the liquid-distributing rib columns.

[0009] Further, the width dimension of the liquid-distributing holes and slits is smaller than the distance dimension between two adjacent liquid-distributing rib columns on its two sides.

[0010] Further, the cross-sectional shape of the liquid-distributing rib column is arc-shaped, triangular or rectangular.

[0011] Further, the steam inlet is located in the upper part of the steam distribution cavity and is arranged opposite to the partition plate. A deflector plate arranged obliquely downward is fixedly installed on the inner side wall of the shell above the steam inlet, and the longitudinal cross-section of the deflector plate is arc-shaped.

[0012] Further, the heat exchange tube bundles are arranged obliquely downward, and its lower end is the end facing the condensate collection cavity.

[0013] Further, each group of heat exchange tube bundles includes several heat exchange tubes arranged in sequence from top to bottom, and each heat exchange tube is of an elliptical flat plate type structure.

[0014] Further, several heat exchange tubes in each group of heat exchange tube bundles are welded in sequence from top to bottom.

[0015] Further, the heat exchange tubes are straight tubes, and the steam distribution cavity, the heat exchange cavity and the condensate collection cavity are arranged in sequence along the horizontal direction.

[0016] Further, the condensate outlet is located in the lower part or the bottom end of the condensate collection cavity.

[0017] The utility model has the following effects compared with the prior art:

[0018] In the drip-feed liquid-distributing steam-water shell-and-tube heat exchanger of the present utility model, the flash steam flows through the tube side. Compared with the prior art where steam flows through the shell side, it can effectively avoid the problem that the desulfurization slurry enters the heat exchange cavity due to poor control of the flash liquid level, resulting in fouling of the heat exchange tube bundle and corrosion of the heat exchange tube bundle. When the drip-feed liquid-distributing steam-water shell-and-tube heat exchanger of the present utility model encounters the problem that the flash liquid is poorly controlled and enters the heat exchange tube bundle, the heat exchange tube bundle can be cleaned by injecting clean water into the heat exchange tube bundle, changing the original way of opening the heat exchange cavity for cleaning, effectively improving the use efficiency of the equipment, and greatly reducing the time cost of maintenance and repair.

[0019] In the drip-feed liquid-distributing steam-water shell-and-tube heat exchanger of the present utility model, the liquid inlet distribution cavity and the drip-feed liquid-distributing plate are combined, so that the water to be heated exchanges heat and wraps the heat exchange tube bundle in a turbulent flow manner, effectively enhancing the heat transfer system of steam-water heat exchange and improving the heat transfer performance from the aspect of the change mode of the fluid state.

[0020] Since the flash steam is relatively clean and there is no distinction between "hard water" and "soft water" like water quality, the way of steam flowing inside the tube can effectively avoid the risk of fouling and blockage on the inner wall of the heat exchange tube bundle caused by poor treatment of the soft water to be heated, and enhance the service life of the equipment.

[0021] Through the drip-feed liquid-distributing steam-water shell-and-tube heat exchanger of the present utility model, by adopting the method of dripping with the drip-feed liquid-distributing plate and combining the flow of steam inside the heat exchange tube bundle, steam-water heat exchange is realized, and the maximum utilization of flash steam for heating can be achieved by a direct-flow heat pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 is a perspective schematic view of the drip-feed liquid-distributing steam-water shell-and-tube heat exchanger of the present utility model;

[0023] Figure 2 is a front view schematic view of the drip-feed liquid-distributing plate;

[0024] Figure 3 is Figure 2 a top view schematic view (not to scale);

[0025] Figure 4 is Figure 2 a left view schematic view (not to scale);

[0026] Figure 5 is a three-dimensional structure schematic view of a group of heat exchange tube bundles.

[0027] In the figure:

[0028] 1. Shell; 2. Dripping liquid distribution plate; 2-1. Water distribution baffle; 2-2. Liquid distribution rib column; 2-3. Liquid distribution hole slot; 3. Partition board; 4. Heat exchange tube bundle; 5. Steam distribution cavity; 6. Heat exchange cavity; 7. Condensate collection cavity; 8. Inlet liquid distribution cavity; 9. Inlet water pipe; 10. Outlet water pipe; 11. Steam inlet; 12. Condensate outlet; 13. Deflector plate. Detailed implementation manners

[0029] Detailed implementation manner one: Combining Figures 1 to 5 To illustrate this implementation manner, the technical solutions in the implementation manners of the present utility model are clearly and completely described. Obviously, the described implementation manners are only a part of the implementation manners of the present utility model, rather than all of them. Based on the implementation manners in the present utility model, all other implementation manners obtained by those of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present utility model.

[0030] It should be noted that the descriptions of the present utility model regarding directions such as "front", "rear", "left", "right", "inside", "outside", "left side", "right side", "upper part", "lower part", "top", "bottom", etc. are all defined based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the described structure must be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In the description of the present utility model, the meaning of "a plurality" is more than two, unless otherwise clearly and specifically defined.

[0031] In the description of the present utility model, unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0032] A dripping liquid distribution type steam-water shell-and-tube heat exchanger includes a shell 1, a dripping liquid distribution plate 2, two partition boards 3, and several groups of heat exchange tube bundles 4. The inside of the shell 1 is separated into a steam distribution cavity 5, a heat exchange cavity 6, and a condensate collection cavity 7 by two partition boards 3. An inlet liquid distribution cavity 8 is separated and arranged above the heat exchange cavity 6 by the dripping liquid distribution plate 2. Several groups of heat exchange tube bundles 4 are all arranged in the heat exchange cavity 6, and both ends of the heat exchange tube bundles 4 are respectively communicated with the steam distribution cavity 5 and the condensate collection cavity 7. The top of the inlet liquid distribution cavity 8 is communicated with an inlet water pipe 9, the bottom of the heat exchange cavity 6 is communicated with an outlet water pipe 10, the steam distribution cavity 5 is communicated with a steam inlet 11, and the condensate collection cavity 7 is communicated with a condensate outlet 12.

[0033] A plurality of through holes are formed in each partition plate 3, and the shape of the through holes is the same as the cross-sectional shape of the heat exchange tubes in the heat exchange tube bundle 4, so as to realize the communication between the heat exchange tubes and the steam distribution cavity 5 and the condensate collection cavity 7. The heat exchange tube bundle 4 and the partition plate 3 can be fixedly connected by flanges.

[0034] The cross-sectional shape of the heat exchange tube can be oval or circular. When it is oval, it is preferably a flat-plate oval.

[0035] Both partition plates 3 are preferably welded inside the housing 1. The internal space of the housing 1 is sequentially divided into a steam distribution cavity 5, a heat exchange cavity 6 and a condensate collection cavity 7 from left to right by the two partition plates 3.

[0036] The drip liquid distribution plate 2 is preferably welded between the two partition plates 3, and the upper part of the heat exchange cavity 6 is partitioned into a liquid inlet distribution cavity 8.

[0037] In the drip liquid distribution type steam-water shell-and-tube heat exchanger of the present utility model, the flash steam flows through the tube side. Compared with the prior art in which the steam flows through the shell side, it can effectively avoid the problem that the desulfurization slurry enters the heat exchange cavity 6 due to poor control of the flash liquid level, resulting in fouling of the heat exchange tube bundle 4 and corrosion of the heat exchange tube bundle 4. When the drip liquid distribution type steam-water shell-and-tube heat exchanger of the present utility model encounters the problem that the flash liquid is poorly controlled and enters the heat exchange tube bundle 4, the heat exchange tube bundle 4 can be cleaned by injecting clean water into the heat exchange tube bundle 4, changing the original way of opening the heat exchange cavity 6 for cleaning, effectively improving the use efficiency of the equipment, and greatly reducing the time cost of maintenance.

[0038] In the drip liquid distribution type steam-water shell-and-tube heat exchanger of the present utility model, the combination of the liquid inlet distribution cavity 8 and the drip liquid distribution plate 2 is adopted, so that the water to be heated exchanges heat and wraps the heat exchange tube bundle 4 in a turbulent flow manner, effectively enhancing the heat transfer system of the steam-water heat exchange from the aspect of the change mode of the fluid state and improving the heat transfer performance.

[0039] Since the flash steam is relatively clean and there is no distinction between "hard water" and "soft water" like water quality, the way of steam flowing inside the tube can effectively avoid the risk of fouling and blockage on the inner wall of the heat exchange tube bundle 4 caused by poor treatment of the water to be heated, and enhance the service life of the equipment.

[0040] Through the drip liquid distribution type steam-water shell-and-tube heat exchanger of the present utility model, by adopting the method of dripping with the drip liquid distribution plate 2 and combining with the flow of steam in the heat exchange tube bundle 4, steam-water heat exchange is realized, and the maximum utilization of flash steam for heating can be achieved by a direct-flow heat pump.

[0041] The heat exchange tubes in the heat exchange tube bundle 4 can be straight tubes or bent tubes. When it is a straight tube, it spans the entire heat exchange cavity 6.

[0042] The inside of the heat exchange tube bundle 4 is flowing steam, and the outside of the heat exchange tube bundle 4 is flowing liquid to be heated. The two exchange heat through the partition wall of the heat exchange tube bundle 4, and the heat is transferred from the flash steam to the liquid to be heated outside the heat exchange tube bundle 4.

[0043] The liquid to be heated enters the liquid inlet distribution cavity 8 through the water inlet pipe 9, and is distributed and dripped onto the outer wall of the heat exchange tube bundle 4 through the drip liquid distribution plate 2 for heat exchange. The heated liquid is discharged through the water outlet pipe 10.

[0044] After the flash steam exchanges heat with the water to be heated through the heat exchange tube bundle 4, the formed condensed water flows into the condensed water collection cavity 7, and then is discharged through the condensed water outlet 12.

[0045] The water inlet pipe 9 and the water outlet pipe 10 are fixedly connected to the housing 1 through flanges respectively.

[0046] The drip liquid distribution plate 2 includes a water distribution baffle 2-1 and a plurality of liquid distribution rib columns 2-2 integrally fixed to the bottom end surface of the water distribution baffle 2-1. Among them, the plurality of liquid distribution rib columns 2-2 are arranged in one-to-one correspondence with a plurality of groups of heat exchange tube bundles 4 below. A plurality of liquid distribution holes and slits 2-3 are formed in the water distribution baffle 2-1, and the plurality of liquid distribution holes and slits 2-3 and the plurality of liquid distribution rib columns 2-2 are arranged staggeredly along the arrangement direction of the liquid distribution rib columns 2-2. Designed in this way, by setting the liquid distribution holes and slits 2-3, the water flow is realized to drip on the heat exchange tube bundle 4 by fitting the surface of the liquid distribution rib columns 2-2 through the liquid distribution holes and slits 2-3. In the liquid inlet distribution cavity 8, due to the obstruction of the water distribution baffle 2-1, the liquid to be heated can only flow out from the liquid distribution holes and slits 2-3. The fluid is restricted by the shape of the liquid distribution rib columns 2-2 and drips onto the outer wall of the steam-water heat exchange tube bundle 4. The heated liquid after heat exchange naturally drips to the bottom of the heat exchange cavity 6 and is discharged through the water outlet pipe 10. Through the drip liquid distribution plate 2, the liquid to be heated is changed into a flowing turbulent state, and the original movement mode of the fluid is changed under the combined action of the drip liquid distribution plate 2 and the heat exchange tube bundle 4, greatly enhancing the heat transfer performance of the fluid.

[0047] The width dimension of the liquid distribution holes and slits 2-3 is smaller than the distance dimension between two adjacent liquid distribution rib columns 2-2 on both sides of it. Designed in this way, it is ensured that the water flow can drip by fitting the surface of the liquid distribution rib columns 2-2.

[0048] The cross-sectional shape of the liquid distribution rib columns 2-2 is circular arc, triangular or rectangular. Designed in this way, the circular arc can be a semi-circular shape, and the cross-sectional shape of the liquid distribution rib columns 2-2 can also be various other shape changes that do not change the liquid dripping principle.

[0049] The steam inlet 11 is located at the upper part of the steam distribution chamber 5 and is arranged opposite to the partition plate 3. The inner side wall of the housing 1 above the steam inlet 11 is fixedly equipped with a deflector plate 13 arranged obliquely downward, and the longitudinal section of the deflector plate 13 is arc-shaped. With such a design, by setting the arc-shaped deflector plate 13, the heating steam entering from the steam inlet 11 is deflected, and the flow direction of the flash steam is controlled to the greatest extent, so that it fully and evenly enters the steam distribution chamber 5 and the heat exchange tube bundle 4. The deflector plate 13 is preferably welded to the inner wall of the housing 1.

[0050] The heat exchange tube bundle 4 is arranged obliquely downward, and its lower end is the end facing the condensate collection chamber 7. With such a design, the droplets formed after the steam condenses and releases heat can flow into the condensate collection chamber 7 more quickly along the inclined direction of the heat exchange tube bundle 4.

[0051] Each group of heat exchange tube bundles 4 includes a number of heat exchange tubes arranged in sequence from top to bottom, and each heat exchange tube is of an elliptical flat plate structure. With such a design, the heat exchange tubes of the elliptical flat plate structure can better realize the dripping of the water to be heated on the heat exchange tube bundle 4, thereby effectively improving the heat exchange efficiency. The material of the heat exchange tubes is preferably copper.

[0052] A number of heat exchange tubes in each group of heat exchange tube bundles 4 are welded in sequence from top to bottom. With such a design, since the distance between two adjacent heat exchange tubes above and below has a great influence on the dripping effect, if the distance is too large, the dripping effect is poor or even dripping cannot be achieved, and if the distance is too small, it is not convenient for the later maintenance of the heat exchange tube bundle 4. By welding the heat exchange tubes together, the dripping of the water to be heated on the heat exchange tube bundle 4 can be better realized, thereby further improving the heat exchange efficiency. At the same time, the assembly difficulty of the heat exchanger is greatly reduced.

[0053] The heat exchange tubes are straight tubes, and the steam distribution chamber 5, the heat exchange cavity 6 and the condensate collection chamber 7 are arranged in sequence along the horizontal direction.

[0054] The condensate outlet 12 is located at the lower part or the bottom end of the condensate collection chamber 7.

[0055] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and the inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A dripping liquid distribution type steam-water shell and tube heat exchanger, characterized in that: The invention comprises a shell (1), a dripping liquid distribution plate (2), two partitions (3) and a plurality of groups of heat exchange tube bundles (4), wherein the shell (1) is divided into a steam distribution chamber (5), a heat exchange cavity (6) and a condensate collection chamber (7) by the two partitions (3); a liquid inlet distribution chamber (8) is provided directly above the heat exchange cavity (6) by the dripping liquid distribution plate (2); the plurality of groups of heat exchange tube bundles (4) are arranged in the heat exchange cavity (6), and the two ends of the heat exchange tube bundles (4) are respectively connected to the steam distribution chamber (5) and the condensate collection chamber (7); the top of the liquid inlet distribution chamber (8) is connected to a water inlet pipe (9); the bottom of the heat exchange cavity (6) is connected to a water outlet pipe (10); the steam distribution chamber (5) is connected to a steam inlet port (11); the condensate collection chamber (7) is connected to a condensate outlet port (12).

2. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 1, characterized in that: The dripping liquid distribution plate (2) comprises a water distribution baffle (2-1) and a plurality of liquid distribution rib columns (2-2) integrally fixed to the bottom end surface of the water distribution baffle (2-1), wherein the plurality of liquid distribution rib columns (2-2) are arranged in one-to-one correspondence with the plurality of groups of heat exchange tube bundles (4) therebelow, a plurality of liquid distribution holes (2-3) are provided on the water distribution baffle (2-1), and the plurality of liquid distribution holes (2-3) and the plurality of liquid distribution rib columns (2-2) are arranged in a staggered manner along the arrangement direction of the liquid distribution rib columns (2-2).

3. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 2, characterized in that: The width of the liquid distribution hole (2-3) is smaller than the distance between two adjacent liquid distribution ribs (2-2) on both sides thereof.

4. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 2, characterized in that: The cross-sectional shape of the liquid distribution rib column (2-2) is arc, triangle or rectangle.

5. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 1, characterized in that: The steam inlet (11) is located at the upper part of the steam distribution chamber (5) and is arranged opposite to the partition (3). A guide plate (13) arranged to be inclined downward is fixedly mounted on the inner side wall of the shell (1) above the steam inlet (11), and the longitudinal section of the guide plate (13) is arc-shaped.

6. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 1, characterized in that: The heat exchange tube bundle (4) is arranged to be inclined downward, and its lower end is the end facing the condensate collection chamber (7).

7. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 1, characterized in that: Each group of heat exchange tube bundles (4) comprises a plurality of heat exchange tubes arranged in sequence from top to bottom, and each heat exchange tube is an elliptical flat sheet structure.

8. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 7, characterized in that: Several heat exchange tubes in each group of heat exchange tube bundles (4) are welded in sequence from top to bottom.

9. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 7, characterized in that: The heat exchange tube is a straight tube, and the steam distribution chamber (5), the heat exchange cavity (6) and the condensed water collection chamber (7) are arranged in sequence in the horizontal direction.

10. The dripping liquid distribution type steam-water shell and tube heat exchanger according to claim 1, characterized in that: The condensed water outlet (12) is located at the lower part or bottom end of the condensed water collecting chamber (7).

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