Drain flash tank

Abstract

The invention relates to the technical field of boilers, and provides a drain flash tank which comprises a flash tank body and a heat exchange box. A heat exchange box is installed on one side of the flash tank, a water inlet is formed in the top end of the heat exchange box, a connecting pipe is installed on one side of the top end of the flash tank, and an auxiliary structure is arranged at the bottom end in the flash tank; the auxiliary structure comprises a mounting seat, the mounting seat is mounted at the bottom end in the flash tank, a rotating blade is mounted at the top end of the mounting seat, a fixing sleeve is mounted on the outer side of the rotating blade, a water outlet is formed in one side of the fixing sleeve, and an annular pipe is mounted at the top end of the mounting seat. The centrifugal force generated by rotation of the rotating blades can throw hydrophobic liquid with higher density to the inner wall of the flash tank, and steam gas with lower density gathers to the center under the action of the centrifugal force, so that vapor-liquid two-phase separation is more thorough, the water drop, namely water carrying phenomenon, carried in steam is reduced, and the quality of recycled steam is improved.

Description

Technical Field

[0001] This invention relates to the field of boiler technology, and in particular to a hydrophobic expansion tank. Background Technology

[0002] The condensate expander is a key device in thermal systems used to handle high-pressure condensate, achieve steam-water separation and energy recovery. It is widely used in power, chemical and heating industries. The core function of the condensate expander is to reduce pressure and expand the volume of high-pressure, high-temperature condensate (containing saturated water or steam-water mixture) from equipment such as boilers, steam turbines and heat exchangers, separate the steam and water, and recover the secondary steam and high-temperature condensate.

[0003] To address this, patent CN217057490U discloses a hydrophobic expansion container, comprising a tank body and a hydrophobic inlet pipe connected to the tank body. The tank body is provided with an exhaust port and an exhaust port. The hydrophobic inlet pipe passes through the tank body and is fixed to the tank body. The outlet and inlet ends of the hydrophobic inlet pipe are located on the inner and outer sides of the tank body, respectively. The hydrophobic inlet pipe includes a noise reduction section located near the outlet end of the hydrophobic inlet pipe. The diameter of the inlet end of the hydrophobic inlet pipe is less than or equal to the diameter of the inlet end of the noise reduction section. The noise reduction section is provided with stepped holes, which include multiple interconnected channels with the diameter of each channel increasing sequentially along the water flow direction. This utility model provides a hydrophobic expansion container with a noise reduction section on the hydrophobic inlet pipe that enables expansion, effectively reducing the noise of the flash evaporation process and thus improving the working environment at the work site.

[0004] The existing technical solutions described above have the following drawbacks: During the use of the above technology, the noise reduction section that can achieve the expansion effect is set in the condensate inlet pipe located on the condensate expansion container, which can effectively reduce the noise of the flash evaporation process and thus effectively improve the working environment at the work site. However, when performing water vapor separation, the condensate is directly discharged into the interior of the condensate expansion container for water vapor separation. This leads to the situation that the separation is not thorough and the separation effect is not good. Therefore, a condensate expansion container is needed to solve the above problems. Summary of the Invention

[0005] The purpose of this invention is to provide a hydrophobic expansion container to solve the defects of existing hydrophobic expansion containers that are prone to incomplete separation and poor separation effect when separating water vapor from hydrophobic substances.

[0006] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a hydrophobic expansion container, comprising an expansion container and a heat exchange box;

[0007] A heat exchange box is installed on one side of the expansion container, a water inlet is installed at the top of the heat exchange box, a connecting pipe is installed on one side of the top of the expansion container, and an auxiliary structure is provided at the bottom of the interior of the expansion container.

[0008] A water collection net is installed at the top of the interior of the expansion container, and a water spraying plate is installed at the bottom of the water collection net. The auxiliary structure includes a mounting base, which is installed at the bottom of the interior of the expansion container. A rotating blade is installed at the top of the mounting base, and a fixing sleeve is installed on the outside of the rotating blade. A water outlet is opened on one side of the fixing sleeve. An annular pipe is installed at the top of the mounting base, and one end of the annular pipe is connected to one end of the fixing sleeve.

[0009] Preferably, a connecting rod is installed at the bottom end of the rotating blade, an mounting plate is installed at the middle position of the connecting rod, a fixing plate is installed at the bottom end of the connecting rod, a rotating shaft is installed on one side of the mounting plate, a rotating disk is installed at the top end of the expansion container, and a connecting plate is installed at the bottom end of the rotating shaft.

[0010] Preferably, the mounting plate is connected to the connecting plate via a belt, the top end of the rotating shaft is connected to the rotating plate via a belt, the bottom end of the rotating plate is equipped with a connecting shaft, and the bottom end of the connecting shaft is equipped with a rotating rod.

[0011] Preferably, the rotating rod is provided in multiple sets, and the multiple sets of rotating rods are distributed in a ring on the outside of the connecting shaft.

[0012] Preferably, the heat exchange box is provided with a heat exchange structure inside. The heat exchange structure includes a mounting frame, which is installed at the bottom of the heat exchange box. A connecting seat is installed at the middle position of the top of the mounting frame. Rotary seats are installed on both sides of the top of the mounting frame. A stirring shaft is installed at the top of the rotating seat. A stirring rod is installed on the outer side of the stirring shaft.

[0013] Preferably, a first heat exchange pipe is installed in the middle of the heat exchange box, and second heat exchange pipes are installed on both sides of the first heat exchange pipe. One end of the second heat exchange pipe is connected to one end of a connecting pipe, and one end of the first heat exchange pipe is connected to the bottom of the expansion container. The first heat exchange pipe and the second heat exchange pipe are made of copper.

[0014] Preferably, the connecting seat is connected to the fixed plate via a belt, and the connecting seat is connected to the rotating seat via a belt.

[0015] Preferably, there are two sets of stirring shafts, which are symmetrically distributed inside the heat exchange box.

[0016] Preferably, the stirring rods are provided in multiple sets, and the multiple sets of stirring rods are arranged at equal intervals on the outer side of the stirring shaft.

[0017] Preferably, the bottom end of the water spray plate is provided with multiple sets of water outlet holes, which are arranged in a ring at the bottom end of the water spray plate.

[0018] The hydrophobic expansion container provided by this invention has the following advantages:

[0019] By incorporating an auxiliary structure, the high-pressure condensate can be accelerated during water vapor separation using an annular tube, thereby increasing its kinetic energy. After being accelerated by the annular tube, the high-pressure condensate impacts the rotating blades and is then evenly ejected by the blades. This avoids the problems of excessively high local pressure and insufficient expansion caused by the "concentrated influx" of condensate in traditional structures.

[0020] Furthermore, the centrifugal force generated by the rotating blades will throw the denser hydrophobic liquid towards the inner wall of the expansion container, while the less dense steam will gather towards the center under the action of centrifugal force, making the separation of the vapor and liquid phases more thorough, reducing the water droplets carried in the steam, i.e. the "water carryover" phenomenon, and improving the quality of the recovered steam.

[0021] Furthermore, the rotated high-pressure condensate will be discharged through the outlet and impact the inner wall of the expansion container. A reinforcing plate is installed at the impact point to prevent damage. When the high-pressure condensate is discharged, the pressure of the condensate decreases due to the sudden increase in the space inside the expansion container. Some of the high-pressure condensate will vaporize into steam. By impacting the inner wall of the expansion container, the high-pressure condensate will disperse due to the impact, thus improving the water-vapor separation effect.

[0022] Furthermore, by guiding the water through the annular pipe, the hydrophobic fluid first impacts the rotating blades. The rotation of the blades absorbs some of the impact energy and converts it into rotational kinetic energy, driving the connecting rod to rotate. The hydrophobic fluid is then evenly ejected at a lower impact velocity, significantly reducing the direct impact force of the fluid on the inner wall of the expansion tank. At the same time, the rotation of the blades makes the fluid movement more orderly, reducing turbulence and disturbances. This reduces vibration and noise at the source, extends the service life of the equipment, and achieves a noise reduction effect.

[0023] This design achieves multiple advantages by introducing rotating blades, including energy recovery, enhanced separation, shock absorption, and noise reduction. It significantly improves energy saving, equipment lifespan, and operational stability, and is especially suitable for scenarios with high-pressure condensate flow and high energy grade.

[0024] Furthermore, by utilizing the rotation of the rotating blades themselves, the rotating rod can be driven to rotate. At this time, the rotating rod can shear the cold water, breaking the cold water from a columnar jet or large droplets into fine droplets or liquid mist, significantly increasing the liquid surface area, improving heat exchange, and thus improving the steam condensation effect. The rotation of the rotating rod utilizes the rotational force of the rotating blades themselves, without the need for additional power, which improves the condensation effect and reduces the operating cost.

[0025] By incorporating a heat exchange structure, to enhance the heat exchange effect of water, the connecting rod drives the connecting seat to rotate via a fixed plate. During this rotation, the connecting seat drives the stirring rod to rotate, agitating the water requiring heat exchange. The rotation of the stirring rod breaks down the cold boundary layer and temperature stratification, allowing the cold water to flow freely. This ensures thorough mixing of water in high-temperature and low-temperature zones, enabling more cold water to directly contact the heat exchange surface, shortening the heat exchange time, reducing energy consumption, and improving the heat exchange effect. The heated water can then be used for domestic water or process water, replacing part of the load on the steam boiler, thus completing the heat exchange process. Attached Figure Description

[0026] Figure 1 This is a frontal three-dimensional structural schematic diagram of the present invention;

[0027] Figure 2 This is a side view three-dimensional structural schematic diagram of the present invention;

[0028] Figure 3 This is a frontal cross-sectional three-dimensional structural schematic diagram of the present invention;

[0029] Figure 4 This is a schematic diagram of the three-dimensional structure of the present invention, shown in a partial cross-section.

[0030] Figure 5 This is a schematic diagram of the three-dimensional structure of the present invention, viewed from below in partial cross-section.

[0031] Figure 6 This is a frontal three-dimensional structural diagram of the annular tube of the present invention;

[0032] Figure 7 This is a top-view three-dimensional structural diagram of the annular tube of the present invention;

[0033] Figure 8 This is a three-dimensional structural schematic diagram of the heat exchange structure of the present invention, viewed from the front and in cross-section.

[0034] Figure 9 This is a top-view three-dimensional structural diagram of the heat exchange structure of the present invention;

[0035] Figure 10 This is a frontal three-dimensional structural schematic diagram of the stirring rack of the present invention;

[0036] Figure 11 This is a bottom view of the stirring rack structure of the present invention.

[0037] The reference numerals in the diagram are as follows: 1. Expansion container; 2. Auxiliary structure; 201. Rotating shaft; 202. Rotating disk; 203. Connecting disk; 204. Mounting disk; 205. Connecting rod; 206. Fixing disk; 207. Annular pipe; 208. Mounting seat; 209. Rotating rod; 2010. Connecting shaft; 2011. Rotating blade; 2012. Water outlet; 2013. Fixing sleeve; 3. Connecting pipe; 4. Water inlet; 5. Heat exchange box; 6. Heat exchange structure; 601. Mounting frame; 602. First heat exchange pipe; 603. Stirring shaft; 604. Second heat exchange pipe; 605. Rotating seat; 606. Connecting seat; 607. Stirring rod; 7. Water collection net; 8. Spraying plate. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0039] Please see Figures 1-11 The present invention provides a hydrophobic expansion container, comprising an expansion container 1 and a heat exchange box 5;

[0040] A heat exchange box 5 is installed on one side of the expansion container 1, and a water inlet 4 is installed at the top of the heat exchange box 5. A connecting pipe 3 is installed on one side of the top of the expansion container 1, and an auxiliary structure 2 is provided at the bottom of the interior of the expansion container 1. A water collection net 7 is installed at the top of the interior of the expansion container 1, and a water spray plate 8 is installed at the bottom of the water collection net 7.

[0041] Reference Figure 1 - Figure 7As shown: The auxiliary structure 2 includes a mounting base 208, which is installed at the bottom of the expansion container 1. A rotating blade 2011 is installed at the top of the mounting base 208, and a fixing sleeve 2013 is installed on the outer side of the rotating blade 2011. An outlet 2012 is provided on one side of the fixing sleeve 2013. An annular pipe 207 is installed at the top of the mounting base 208, and one end of the annular pipe 207 is connected to one end of the fixing sleeve 2013. A connecting rod 205 is installed at the bottom of the rotating blade 2011, and a mounting plate 204 is installed at the middle position of the connecting rod 205. A fixed plate 206 is installed at the bottom of the 05. A rotating shaft 201 is installed on one side of the mounting plate 204. A rotating plate 202 is installed at the top of the expansion container 1. A connecting plate 203 is installed at the bottom of the rotating shaft 201. The mounting plate 204 is connected to the connecting plate 203 via a belt. The top of the rotating shaft 201 is connected to the rotating plate 202 via a belt. A connecting shaft 2010 is installed at the bottom of the rotating plate 202. A rotating rod 209 is installed at the bottom of the connecting shaft 2010. Multiple sets of rotating rods 209 are provided, and the multiple sets of rotating rods 209 are distributed in a ring on the outside of the connecting shaft 2010.

[0042] Specifically, in this embodiment, during the water vapor separation of the high-pressure hydrophobic liquid, the high-pressure hydrophobic liquid is injected into the expansion container 1. When the high-pressure hydrophobic liquid enters the annular tube 207, the use of the annular tube 207 can accelerate the high-pressure hydrophobic liquid, thereby increasing its kinetic energy. When the high-pressure hydrophobic liquid is discharged through the bottom end of the annular tube 207, it will be injected into the mounting base 208. After being accelerated by the annular tube 207, the high-pressure hydrophobic liquid will impact the rotating blade 2011 and then be evenly thrown out by the rotating blade 2011. This avoids the problem of excessively high local pressure and insufficient expansion caused by the "concentrated influx" of hydrophobic liquid in traditional structures. The centrifugal force generated by the rotation of the rotating blade 2011 will throw the denser hydrophobic liquid towards the expansion container. The inner wall of the expansion container 1 is used for steam separation. The less dense vapor gaseous state gathers towards the center under the action of centrifugal force and is discharged through the top of the fixed sleeve 2013, making the separation of the vapor and liquid phases more thorough, reducing the water droplets carried in the steam, i.e., the "water carry-over" phenomenon, and improving the quality of the recovered steam. The high-pressure condensate after rotation will be discharged through the outlet 2012 and impact the inner wall of the expansion container 1. The position where the condensate is impacted is equipped with a reinforcing plate to prevent damage to the impact point. When the high-pressure condensate is discharged, the pressure of the condensate decreases due to the sudden increase in the space inside the expansion container 1. Some of the high-pressure condensate will vaporize into steam. By impacting the high-pressure condensate on the inner wall of the expansion container 1, the high-pressure condensate will disperse after the impact, thus making the water-vapor separation effect better.

[0043] Furthermore, in traditional hydrophobic expansion containers, when high-pressure hydrophobic fluid directly enters the container, the impact of the high-speed fluid on the container wall will generate strong vibrations and noise. Long-term operation may lead to problems such as fatigue of the container welds and loosening of pipes. By guiding the hydrophobic fluid through the annular pipe 207 to impact the rotating blade 2011 first, the rotating blade 2011 can "absorb" part of the impact energy and convert it into rotational kinetic energy to drive the connecting rod 205 to rotate, and then the hydrophobic fluid is evenly thrown out at a lower impact speed, which greatly reduces the direct impact force of the fluid on the inner wall of the expansion container 1. At the same time, the rotation of the rotating blade 2011 makes the fluid movement more orderly, reduces turbulence disturbance, reduces vibration and noise from the source, extends the service life of the equipment, and achieves a noise reduction effect. This design achieves multiple advantages of energy recovery + enhanced separation + impact buffering + noise reduction by introducing the rotating blade 2011. It has significant improvements in energy saving, equipment life and operational stability, and is especially suitable for scenarios with large high-pressure hydrophobic flow and high energy grade.

[0044] As water vapor rises, externally supplied cold water is sprayed out through the spray plate 8. The sprayed cold water comes into contact with the rising steam, causing it to cool and condense into water. The function of the spray plate 8 is to increase the contact area between the steam and the cooling water, improve cooling and condensation efficiency, and reduce steam emissions. When the spray plate 8 is spraying water, the rotating blades 2011 drive the connecting rod 205 to rotate. During this rotation, the connecting rod 205 drives the rotating shaft 201 at the top of the connecting plate 203 to rotate via the fixed plate 206. The rotating shaft 201, in turn, drives the connecting shaft 2010 to rotate via the rotating plate 202. The rotating shaft 2010, in turn, drives the rotating rod 209 to rotate. The rotating rod 209 can shear the cold water, breaking it from a columnar jet or large droplets into fine droplets or mist, significantly increasing the liquid surface area and improving heat exchange, thereby enhancing the steam condensation effect. The rotation of the rotating rod 209 is powered by the rotational force of the rotating blades 2011, requiring no additional power, which improves the condensation effect and reduces operating costs. When the condensed steam passes through the water collection net 7, the water collection net 7 can intercept the steam that has not yet condensed after spray cooling, causing the steam to further condense into water when in contact with the water collection net 7, reducing the amount of steam discharged from the connecting pipe 3, improving the condensate recovery efficiency, and ultimately completing the water vapor separation work for high-pressure condensate.

[0045] Reference Figure 8 - Figure 11As shown: The heat exchange box 5 is internally equipped with a heat exchange structure 6. The heat exchange structure 6 includes a mounting bracket 601, which is installed at the bottom of the heat exchange box 5. A connecting seat 606 is installed at the middle position of the top of the mounting bracket 601. Rotary seats 605 are installed on both sides of the top of the mounting bracket 601. A stirring shaft 603 is installed at the top of the rotating seat 605, and a stirring rod 607 is installed on the outer side of the stirring shaft 603. A first heat exchange pipe 602 is installed at the middle position inside the heat exchange box 5. Second heat exchange pipes 604 are installed on both sides of the first heat exchange pipe 602. One end of the second heat exchange pipe 604 is connected to a connecting pipe. One end of the first heat exchange tube 602 is connected to the bottom end of the expansion container 1. The first heat exchange tube 602 and the second heat exchange tube 604 are made of copper. The connecting seat 606 is connected to the fixed plate 206 by a belt and to the rotating seat 605 by a belt. Two sets of stirring shafts 603 are provided, and the two sets of stirring shafts 603 are symmetrically distributed inside the heat exchange box 5. Multiple sets of stirring rods 607 are provided, and the multiple sets of stirring rods 607 are arranged at equal intervals on the outside of the stirring shafts 603. Multiple sets of water outlet holes are provided at the bottom end of the water spray plate 8, and the multiple sets of water outlet holes are arranged in a ring at the bottom end of the water spray plate 8.

[0046] Specifically, in this embodiment, the discharged steam and discharged condensate flow into the interiors of the second heat exchange pipe 604 and the first heat exchange pipe 602, respectively. The steam and condensate then heat the water inside the heat exchange tank 5 through heat exchange, utilizing the heat in the steam and condensate to reduce heat waste. During heat exchange, the water temperature is detected by an internally installed temperature sensor. During heat exchange, the connecting rod 205 also drives the connecting seat 606 to rotate via the fixed plate 206. The rotating connecting seat 606 drives the stirring rod 607 to rotate, stirring the water requiring heat exchange. When the cold water is stationary or flowing at a low speed, it approaches the heat exchanger. The surface portion is heated first, forming a temperature stratification. The water near the heat source is hotter, while the water further away is colder, and a static cold boundary layer may even form. This low-temperature water layer acts like an insulation layer, hindering heat transfer to the interior of the cold water, resulting in a significant decrease in heat exchange efficiency. By rotating the stirring rod 607, the cold boundary layer and temperature stratification are broken, allowing the cold water to flow as a whole. This enables the water in the high-temperature zone to mix thoroughly with the water in the low-temperature zone, allowing more cold water to directly contact the heat exchange surface, shortening the heat exchange time, reducing energy consumption, and improving the heat exchange effect. After heating, the hot water can be used for domestic water or process water, replacing part of the load of the steam boiler, thereby completing the heat exchange work.

[0047] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A hydrophobic expansion container, characterized in that: Includes an expansion container (1) and a heat exchange box (5); A heat exchange box (5) is installed on one side of the expansion container (1), and a water inlet (4) is installed at the top of the heat exchange box (5). A connecting pipe (3) is installed on one side of the top of the expansion container (1), and an auxiliary structure (2) is provided at the bottom of the interior of the expansion container (1). The expansion container (1) is equipped with a water collection net (7) at its top and a water spray plate (8) at its bottom. The auxiliary structure (2) includes a mounting base (208) at the bottom of the expansion container (1). A rotating blade (2011) is installed at the top of the mounting base (208). A fixing sleeve (2013) is installed on the outside of the rotating blade (2011). A water outlet (2012) is opened on one side of the fixing sleeve (2013). An annular pipe (207) is installed at the top of the mounting base (208). One end of the annular pipe (207) is connected to one end of the fixing sleeve (2013).

2. The hydrophobic expansion container according to claim 1, characterized in that: A connecting rod (205) is installed at the bottom end of the rotating blade (2011), an mounting plate (204) is installed at the middle position of the connecting rod (205), a fixing plate (206) is installed at the bottom end of the connecting rod (205), a rotating shaft (201) is installed on one side of the mounting plate (204), a rotating plate (202) is installed at the top end of the expansion container (1), and a connecting plate (203) is installed at the bottom end of the rotating shaft (201).

3. A hydrophobic expansion container according to claim 2, characterized in that: The mounting plate (204) is connected to the connecting plate (203) via a belt. The top end of the rotating shaft (201) is connected to the rotating plate (202) via a belt. The bottom end of the rotating plate (202) is equipped with a connecting shaft (2010), and the bottom end of the connecting shaft (2010) is equipped with a rotating rod (209).

4. A hydrophobic expansion container according to claim 3, characterized in that: The rotating rod (209) is provided in multiple sets, and the multiple sets of the rotating rod (209) are distributed in a ring on the outside of the connecting shaft (2010).

5. A hydrophobic expansion container according to claim 1, characterized in that: The heat exchange box (5) is provided with a heat exchange structure (6) inside. The heat exchange structure (6) includes a mounting frame (601). The mounting frame (601) is installed at the bottom of the heat exchange box (5). A connecting seat (606) is installed at the middle position of the top of the mounting frame (601). Rotary seats (605) are installed on both sides of the top of the mounting frame (601). A stirring shaft (603) is installed at the top of the rotating seat (605). A stirring rod (607) is installed on the outside of the stirring shaft (603).

6. A hydrophobic expansion container according to claim 5, characterized in that: A first heat exchange tube (602) is installed in the middle of the heat exchange box (5). A second heat exchange tube (604) is installed on both sides of the first heat exchange tube (602). One end of the second heat exchange tube (604) is connected to one end of the connecting pipe (3). One end of the first heat exchange tube (602) is connected to the bottom end of the expansion container (1). The first heat exchange tube (602) and the second heat exchange tube (604) are made of copper.

7. A hydrophobic expansion container according to claim 5, characterized in that: The connecting seat (606) is connected to the fixed plate (206) by a belt, and the connecting seat (606) is connected to the rotating seat (605) by a belt.

8. A hydrophobic expansion container according to claim 5, characterized in that: Two sets of stirring shafts (603) are provided, and the two sets of stirring shafts (603) are symmetrically distributed inside the heat exchange box (5).

9. A hydrophobic expansion container according to claim 5, characterized in that: The stirring rod (607) is provided in multiple sets, and the multiple sets of stirring rods (607) are arranged at equal intervals on the outside of the stirring shaft (603).

10. A hydrophobic expansion container according to claim 1, characterized in that: The bottom of the water spray plate (8) is provided with multiple sets of water outlet holes, which are arranged in a ring at the bottom of the water spray plate (8).

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