Hydrophobic expansion heat recovery device

Abstract

The present application relates to the field of heat recovery devices, and provides a hydrophobic expansion heat recovery device, including a hydrophobic expansion tank, a condensing tank, an exhaust assembly and a drainage assembly; the top of the hydrophobic expansion tank is provided with a first exhaust port, and the bottom is provided with a drainage port; the bottom of the condensing tank is provided with a reflux port, and the height of the reflux port is higher than the first exhaust port; the exhaust assembly includes a first exhaust pipe, a first branch pipe, a second branch pipe, a first valve and a second valve; one end of the first exhaust pipe is connected to the first exhaust port, and the other end is respectively connected to one end of the first branch pipe and the second branch pipe; the other end of the first branch pipe is connected to the condensing tank; the first valve is provided on the first branch pipe, and the second valve is provided on the second branch pipe; the drainage assembly includes a water pump and a mixed flow pipe; the water inlet of the water pump is connected to the drainage port; the mixed flow pipe is respectively connected to the water outlet of the water pump and the end of the second branch pipe away from the first exhaust pipe. The present application solves the problem of water delivery heat recovery and cavitation easily caused by hydrophobicity.

Description

Technical Field

[0001] This application relates to the field of heat recovery devices, and particularly to a hydrophobic expansion heat recovery device. Background Art

[0002] During the startup and shutdown processes of steam systems such as boilers, a large amount of high-pressure hydrophobic water is generated. The hydrophobic water is usually introduced into a hydrophobic expansion vessel for vapor-liquid separation. Specifically, after the hydrophobic water enters the hydrophobic expansion vessel, due to the sudden drop in pressure, a part of the hydrophobic water will flash to form steam.

[0003] Currently, steam usually discharges from the top of the hydrophobic expansion vessel through a pipeline. However, directly discharging steam not only causes waste of heat, but also generates white smoke after the steam is discharged to the outside, reducing the visual perception of the public. And directly discharging steam through a pipeline easily allows external gases or other impurities to enter the hydrophobic expansion vessel, contaminating the hydrophobic water and the hydrophobic expansion vessel.

[0004] If the steam is not discharged, it is easy to cause cavitation in the water conveyance components. Summary of the Invention

[0005] In order to solve the problems of heat recovery of water conveyance and easy cavitation caused by hydrophobic water, this application provides a hydrophobic expansion heat recovery device.

[0006] The hydrophobic expansion heat recovery device provided by this application adopts the following technical solutions:

[0007] A hydrophobic expansion heat recovery device includes: a hydrophobic expansion vessel, a condensate tank, an exhaust assembly, and a liquid discharge assembly;

[0008] The top of the hydrophobic expansion vessel is provided with a first exhaust port, and the bottom is provided with a liquid discharge port;

[0009] The bottom of the condensate tank is provided with a return port, and the height of the return port is higher than that of the first exhaust port;

[0010] The exhaust assembly includes a first exhaust pipe, a first branch pipe, a second branch pipe, a first valve, and a second valve; one end of the first exhaust pipe is connected to the first exhaust port, and the other end is respectively connected to one ends of the first branch pipe and the second branch pipe; the other end of the first branch pipe is communicated with the condensate tank; the first valve is arranged on the first branch pipe, and the second valve is arranged on the second branch pipe;

[0011] The liquid discharge assembly includes a water pump and a mixing pipe; the water inlet of the water pump is communicated with the liquid discharge port;

[0012] The mixing pipe is respectively communicated with the water outlet of the water pump and the end of the second branch pipe away from the first exhaust pipe.

[0013] By adopting the above technical solution, the first exhaust port at the top of the hydrophobic expansion tank can discharge steam, and the drain port at the bottom is used to discharge hydrophobic water; by controlling the opening and closing of the first valve and the second valve, different heat recovery methods can be achieved. Specifically:

[0014] 1. When the first valve is opened and the second valve is closed, steam enters the condensation tank for heat exchange and condensation and then flows back into the hydrophobic expansion tank, achieving heat recovery. Moreover, the water after condensation flowing back into the hydrophobic expansion tank can reduce the water temperature in the hydrophobic expansion tank, thereby reducing the probability of cavitation occurring in the air pump.

[0015] 2. When the first valve is closed and the second valve is opened, steam enters the second branch pipe for gas-liquid separation. By utilizing the characteristics that a large amount of heat is carried away by the steam during the gas-liquid separation process and the gas content of the remaining hydrophobic water in the hydrophobic expansion tank is greatly reduced, cavitation will not be caused when the hydrophobic water in the hydrophobic expansion tank flows through the water pump.

[0016] 3. After the hydrophobic water flows through the water pump, it remixes with steam again in the mixing pipe, achieving heat recovery. Moreover, there is no loss of steam during the process, the heat recovery rate is relatively high, and pollution caused by external impurities is avoided.

[0017] Optionally, the hydrophobic expansion heat recovery device further includes a drain tank, and the drain tank is communicated with the drain port; the bottom of the drain tank is communicated with the water inlet of the water pump.

[0018] By adopting the above technical solution, the setting of the drain tank can improve the stability of the system. Specifically:

[0019] 1. The drain tank temporarily stores the liquid discharged from the drain port, avoiding possible impact or unstable flow when the liquid directly enters the water pump, thereby improving the stability of the system.

[0020] 2. The setting of the drain tank enables the hydrophobic water separated in the hydrophobic expansion tank to be discharged from the hydrophobic expansion tank relatively quickly, minimizing the re-dissolution of gas into the hydrophobic water. Moreover, due to the water storage function of the drain tank, the hydrophobic expansion tank can continuously carry out hydrophobic water treatment, and the size of the hydrophobic expansion tank does not need to be too large, which helps to reduce the cost of the hydrophobic expansion tank.

[0021] 3. The hydrophobic water after gas-liquid separation and the condensed water obtained after condensation in the condensation tank can be fully mixed in the drain tank, making the temperature more uniform and reducing the probability of cavitation.

[0022] Optionally, the exhaust assembly further includes a second exhaust pipe, and the top of the drain tank is communicated with the first exhaust pipe through the second exhaust pipe.

[0023] By adopting the above technical solution, the hydrophobic expansion heat recovery device can discharge a small amount of steam and non-condensable gas that are not completely separated from the condensed water entering the condensate tank to the first exhaust pipe by arranging a second exhaust pipe at the top of the condensate tank and connecting it to the first exhaust pipe. Combining the overall design of the hydrophobic flash tank, the condensate tank, the exhaust assembly and the liquid discharge assembly, this solution further optimizes the gas flow path during heat recovery, reduces energy loss, and improves the operation efficiency and reliability of the entire device.

[0024] Optionally, the condensate tank includes a tank body, a heat exchange unit and a third valve;

[0025] A second exhaust port is provided at the top of the tank body; the third valve is arranged at the second exhaust port;

[0026] The heat exchange unit is arranged inside the tank body and is used for exchanging heat with the steam entering the tank body.

[0027] By adopting the above technical solution, the condensate tank can effectively recover the heat in the steam and realize the condensation of the steam. Specifically, the steam recovers heat by exchanging heat with the heat exchange component. The setting of the third valve facilitates the control of the exhaust process. When the third valve is closed, the loss of moisture can be avoided. If the steam separated from the condensed water during the vapor-liquid separation contains non-condensable gas, it can be discharged by opening the third valve.

[0028] Optionally, the heat exchange unit includes a liquid spray main pipe, a rotary joint and a plurality of liquid spray branch pipes;

[0029] The liquid spray main pipe is arranged vertically and connected to the inner wall of the tank body; a plurality of the liquid spray branch pipes are arranged at intervals in the circumferential direction, and one end of each liquid spray branch pipe is communicated with the liquid spray main pipe through the rotary joint;

[0030] The liquid spray branch pipe is bent, and the end of the liquid spray branch pipe away from the rotary joint sprays the first heat exchange medium to make the liquid spray branch pipe rotate.

[0031] By adopting the above technical solution, the liquid spray main pipe is arranged vertically in the tank body, a plurality of liquid spray branch pipes are arranged at intervals in the circumferential direction and are communicated with the liquid spray main pipe through the rotary joint, and the bent liquid spray branch pipe can rotate itself by spraying the first heat exchange medium. This design enables the liquid spray branch pipe to expand the spraying coverage range during rotation, and the sprayed first heat exchange medium can form a curtain wall, thereby improving the heat exchange efficiency and ensuring that the steam entering the tank body can fully contact the first heat exchange medium and be quickly condensed.

[0032] Optionally, the lengths of the plurality of liquid spray branch pipes are not completely the same, so that the spraying areas of the liquid spray branch pipes with different lengths do not completely overlap.

[0033] By adopting the above technical solution, the lengths of multiple liquid spraying branch pipes are not exactly the same, so that the spraying areas do not completely overlap, which can expand the spraying coverage range of the first heat exchange medium, enhance the heat exchange effect, more fully condense the steam entering the tank, and improve the heat recovery efficiency.

[0034] Optionally, the spraying direction of the liquid spraying branch pipe is towards the upper oblique direction.

[0035] By adopting the above technical solution, the spraying direction of the liquid spraying branch pipe is towards the upper oblique direction, which can avoid the first heat exchange medium sprayed by the shorter liquid spraying branch pipe hitting the longer spraying branch pipe, reducing the energy loss. Secondly, the spraying direction towards the upper oblique direction can prolong the flight time of the first heat exchange medium in the air and improve the heat exchange effect.

[0036] Optionally, the heat exchange unit further includes a spiral heat exchange pipe, and a second heat exchange medium flows through the spiral heat exchange pipe.

[0037] By adopting the above technical solution, the second heat exchange medium can recover the heat of the steam by flowing through the spiral heat exchange pipe. The spiral pipe shape increases the heat exchange area and heat exchange effect, improves the condensation efficiency of the steam, and thus improves the heat recovery capacity of the whole device.

[0038] Optionally, the water outlet end of the spiral heat exchange pipe is communicated with the main liquid spraying pipe.

[0039] By adopting the above technical solution, the flash steam heat recovery device can achieve efficient heat recovery and utilization. The specific effects are as follows:

[0040] 1. The water outlet end of the spiral heat exchange pipe is communicated with the main liquid spraying pipe, so that the second heat exchange medium can directly enter the main liquid spraying pipe after completing the heat exchange, further participating in the subsequent spraying heat exchange process. This not only improves the utilization rate of the heat exchange medium, but also optimizes the energy cycle of the whole device and reduces the energy loss.

[0041] 2. This design simplifies the structure of the heat exchange system, avoids the complexity of additionally setting up discharge or return pipelines, and reduces the manufacturing cost and maintenance difficulty of the device.

[0042] 3. The liquid sprayed by the liquid spraying branch pipe can further exchange heat with the second heat exchange medium in the spiral heat exchange pipe after falling on the spiral heat exchange pipe. On the one hand, it enables the second heat exchange medium to absorb more heat within a limited time and space; on the other hand, the liquid sprayed by the liquid spraying branch pipe can continue to exchange heat with the steam after exchanging heat with the second heat exchange medium. Through the above settings, the heat recovery efficiency is greatly improved.

[0043] Optionally, the condensation tank further includes a condensation member, and the condensation member is arranged in the second exhaust port.

[0044] By adopting the above technical solution, the condensing member can further condense the steam, avoiding steam leakage caused by insufficient condensation of the steam during the heat exchange process with the heat exchange component.

[0045] In summary, the present application includes at least one of the following beneficial technical effects:

[0046] 1. By providing an exhaust component between the hydrophobic expansion vessel and the condensation tank, and using the first exhaust pipe, the first branch pipe, and the second branch pipe in cooperation with the first valve and the second valve, the steam flow direction can be flexibly adjusted, realizing different heat recovery methods;

[0047] 2. The water pump in the liquid discharge component is combined with the mixing pipe. The liquid discharged from the hydrophobic expansion vessel is fully mixed with the steam in the mixing pipe only after flowing through the water pump, which not only realizes heat recovery but also reduces the probability of cavitation;

[0048] 3. The spiral heat exchange tube is combined with the liquid spraying branch pipe, greatly improving the heat recovery efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Figure 1 is a schematic structural diagram of the hydrophobic expansion heat recovery device provided by the present application.

[0050] Figure 2 is a schematic structural diagram of the condensation tank of the hydrophobic expansion heat recovery device provided by the present application.

[0051] Figure 3 is a top view of the rotary joint and the liquid spraying branch pipe provided by the present application.

[0052] Description of the reference numerals:

[0053] 1. Hydrophobic expansion vessel;

[0054] 2. Condensation tank; 21. Tank body; 211. Return port; 212. Second exhaust port; 22. Heat exchange unit; 221. Liquid spraying main pipe; 222. Rotary joint; 223. Liquid spraying branch pipe; 224. Spiral heat exchange tube; 23. Condensing member; 24. Third valve;

[0055] 3. Drainage tank;

[0056] 4. Exhaust component; 41. First exhaust pipe; 42. Second exhaust pipe; 43. First branch pipe; 44. Second branch pipe; 45. First valve; 46. Second valve;

[0057] 5. Liquid discharge component; 51. Water pump; 52. Mixing pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0058] The following is combined with the attached Figure 1 - Attached Figure 3This application is described in further detail.

[0059] like Figures 1 to 2 As shown, an embodiment of the present application discloses a hydrophobic expansion heat recovery device, including a hydrophobic expansion tank 1, a condensation tank 2, a hydrophobic box 3, an exhaust component 4 and a drainage component 5.

[0060] Specifically, the top of the hydrophobic expansion container 1 is provided with a first exhaust port, and the bottom is provided with a liquid discharge port. The liquid discharge port is connected to the hydrophobic tank 3 through a connecting pipe. A solenoid valve can be provided on the connecting pipe.

[0061] A reflux port 211 is provided at the bottom of the tank body 21 of the condensation tank 2 , and the height of the reflux port 211 is higher than the first exhaust port.

[0062] The exhaust assembly 4 includes a first exhaust pipe 41, a second exhaust pipe 42, a first branch pipe 43, a second branch pipe 44, a first valve 45 and a second valve 46. One end of the first exhaust pipe 41 is connected to the first exhaust port, and the other end is connected to one end of the first branch pipe 43 and the second branch pipe 44 respectively; the other end of the first branch pipe 43 is connected to the condensation tank 2; the first valve 45 is provided on the first branch pipe 43, and the second valve 46 is provided on the second branch pipe 44;

[0063] The liquid discharge assembly 5 includes a water pump 51 and a mixing pipe 52. The water inlet of the water pump 51 is connected to the bottom of the drain tank 3. The mixing pipe 52 is connected to the water outlet of the water pump 51 and the end of the second branch pipe 44 away from the first exhaust pipe 41.

[0064] When the drain enters the drain expansion tank 1, due to the pressure reduction, a part of the drain will flash and become steam and separate from the remaining drain. The remaining drain flows into the drain tank 3, and the remaining drain can be transported to the heat-using equipment through the water pump 51. The steam enters the first exhaust pipe 41. It should be noted that there may be a small amount of steam in the drain tank 3, and this part of the steam can enter the first exhaust pipe 41 through the second exhaust pipe 42. Since the first exhaust pipe 41 is connected to the first branch pipe 43 and the second branch pipe 44 respectively. Therefore, the user can change the flow direction of the steam by controlling the opening and closing of the first valve 45 and the second valve 46.

[0065] Specifically, when the first valve 45 is opened and the second valve 46 is closed, the steam enters the condensation tank 2. The condensation tank 2 includes a tank body 21, a heat exchange unit 22, a condensation element 23 and a third valve 24. The heat exchange unit 22 is arranged inside the tank body 21, and the heat exchange component recovers the heat of the steam by exchanging heat with the steam entering the tank body 21. After the heat exchange, the steam becomes condensed water and flows back to the drain expansion tank 1 and the drain tank 3.

[0066] The top of the tank body 21 is provided with a second exhaust port 212, and a third valve 24 is arranged at the second exhaust port 212. If the separated steam contains non-condensable gases (such as oxygen, carbon dioxide, etc.), and the user hopes to discharge the non-condensable gases, the non-condensable gases can be discharged by opening the third valve 24. A condensing member 23 is arranged in the second exhaust port 212. If the steam is not completely condensed during the heat exchange process with the heat exchange unit 22, the steam may be discharged from the second exhaust port 212, resulting in water and heat loss. By arranging the condensing member 23, the steam can be fully condensed to avoid the above hidden dangers. Among them, the condensing member 23 can be a condensing plate, and the condensing plate has ventilation holes, and a filter screen can be arranged at the ventilation holes.

[0067] Since the drain water belongs to a gas-liquid two-phase flow and has a relatively high temperature. If the drain water directly flows through the water pump 51, it may cause cavitation of the water pump 51. However, through the drain water expansion vessel 1, the drain water is separated into gas and liquid, and after the steam takes away a large amount of heat, it becomes condensed water and flows back into the drain water tank 3, reducing the gas content and the total water temperature of the drain water in the drain water tank 3, and reducing the probability of cavitation occurrence.

[0068] When the first valve 45 is closed and the second valve 46 is opened, the steam enters the second branch pipe 44. Due to the gas-liquid separation and the steam taking away a large amount of heat, the probability of cavitation of the drain water in the drain water tank 3 when flowing through the water pump 51 is greatly reduced. After the drain water flows through the water pump 51, the drain water and the steam are remixed in the mixing pipe 52. The steam does not leak and the heat loss rate is relatively low, and the heat can be fully recovered. Then, under the action of the water pump 51, the steam is dissolved in the drain water and is transported to the heat-using equipment together with the drain water. Among them, the mixing pipe 52 can be a Venturi tube. Through the rapid flow of the drain water, the steam is sucked in and the steam is fully mixed with the drain water.

[0069] As Figures 2 to 3 shown, in some embodiments, the heat exchange unit 22 includes a liquid spraying main pipe 221, a rotating joint 222, and multiple liquid spraying branch pipes 223.

[0070] The liquid spraying main pipe 221 is vertically arranged and connected to the inner wall of the tank body 21. The rotating joint 222 is connected to the top of the liquid spraying main pipe 221. Multiple liquid spraying branch pipes 223 are arranged at intervals along the circumferential direction, and one end of each liquid spraying branch pipe 223 is communicated with the liquid spraying main pipe 221 through the rotating joint 222. By introducing the first heat exchange medium into the liquid spraying main pipe 221, the first heat exchange medium can be sprayed out from the end of the liquid spraying branch pipe 223 far away from the rotating joint 222, so as to exchange heat with the steam. After the steam becomes condensed water, it flows back into the drain water tank 3 together with the first heat exchange medium. Among them, the first heat exchange medium can be demineralized water. The demineralized water flows back into the drain water tank 3 together with the condensed water, and can appropriately supplement the drain water tank 3.

[0071] The first heat exchange medium ejected from the liquid spray branch pipe 223 is in a divergent shape, thereby increasing the spraying range. The liquid spray branch pipe 223 is bent, so that the reaction force when the end of the liquid spray branch pipe 223 away from the rotary joint 222 ejects the first heat exchange medium can cause the liquid spray branch pipe 223 to rotate relative to the liquid spray main pipe 221, so that the liquid spray branch pipe 223 can spray the first heat exchange medium in all directions to form a curtain wall, ensuring that the steam can contact and exchange heat with the first heat exchange medium.

[0072] Furthermore, the lengths of multiple liquid spray branch pipes 223 are not completely the same, so that the spraying areas of the liquid spray branch pipes 223 with different lengths do not completely overlap, expanding the spraying coverage range of the first heat exchange medium and enhancing the heat exchange effect. For example, two specifications of liquid spray branch pipes 223 with different lengths can be set, and the two specifications of liquid spray branch pipes 223 are arranged alternately in the circumferential direction.

[0073] Furthermore, the spraying direction of the liquid spray branch pipe 223 is towards the upper oblique direction, so that the first heat exchange medium can stay in the air for a longer time, enhancing the heat exchange effect. On the other hand, spraying towards the upper oblique direction can prevent the first heat exchange medium ejected from the shorter liquid spray branch pipe 223 from hitting the longer liquid spray branch pipe 223, avoiding the loss of kinetic energy of the first heat exchange medium and also avoiding interference with the rotational movement of the liquid spray branch pipe 223.

[0074] In some other embodiments, the heat exchange unit 22 includes a spiral heat exchange tube 224, and a second heat exchange medium flows through the spiral heat exchange tube 224. When the steam contacts the spiral heat exchange tube 224, it can exchange heat with the second heat exchange medium, thereby realizing heat recovery. Among them, the second heat exchange medium and the first heat exchange medium can be the same type of liquid or different types of liquid. The specific type of the second heat exchange medium is not forcibly limited, as long as the heat recovery of the steam can be realized.

[0075] Furthermore, the liquid spraying heat exchange method realized by the liquid spray main pipe 221 and the liquid spray branch pipe 223, and the heat exchange method through the spiral heat exchange tube 224 and the second heat exchange medium can be combined to use, thereby enhancing the heat exchange effect.

[0076] For example, both the first heat exchange medium and the second heat exchange medium can be desalted water. The water outlet end of the spiral heat exchange tube 224 is communicated with the water spraying main pipe. By introducing desalted water into the spiral heat exchange tube 224, the desalted water absorbs the heat of the steam when flowing through the spiral heat exchange tube 224. Subsequently, the desalted water enters the liquid spray main pipe 221 and is finally ejected through the liquid spray branch pipe 223 to further absorb the heat of the steam.

Claims

1. A hydrophobic expansion heat recovery device, characterized in that, include: A drain expansion container (1), a condensation tank (2), a drain box (3), an exhaust assembly (4) and a drainage assembly (5); The hydrophobic expansion container (1) is provided with a first exhaust port at the top and a liquid discharge port at the bottom; The drain tank (3) is in communication with the liquid discharge port; A reflux port (211) is provided at the bottom of the condensation tank (2), and the height of the reflux port (211) is higher than the first exhaust port; The exhaust assembly (4) comprises a first exhaust pipe (41), a first branch pipe (43), a second branch pipe (44), a first valve (45) and a second valve (46); one end of the first exhaust pipe (41) is connected to the first exhaust port, and the other end is respectively connected to one end of the first branch pipe (43) and one end of the second branch pipe (44); the other end of the first branch pipe (43) is in communication with the condensation tank (2); the first valve (45) is arranged on the first branch pipe (43), and the second valve (46) is arranged on the second branch pipe (44); The liquid discharge assembly (5) comprises a water pump (51) and a mixing pipe (52); the water inlet of the water pump (51) is connected to the bottom of the drain tank (3); The mixing pipe (52) is respectively connected to the water outlet of the water pump (51) and an end of the second branch pipe (44) facing away from the first exhaust pipe (41); The condensation tank (2) comprises a tank body (21), a heat exchange unit (22) and a third valve (24); A second exhaust port (212) is provided on the top of the tank body (21); the third valve (24) is provided at the second exhaust port (212); The heat exchange unit (22) is arranged inside the tank body (21) and is used to exchange heat with the steam entering the tank body (21); The heat exchange unit (22) comprises a liquid spraying main pipe (221), a rotating joint (222), and a plurality of liquid spraying branch pipes (223); The liquid spraying main pipe (221) is arranged vertically and connected to the inner wall of the tank body (21); a plurality of liquid spraying branch pipes (223) are arranged at intervals along the circumferential direction and one end of each of the liquid spraying branch pipes (223) is connected to the liquid spraying main pipe (221) via the rotating joint (222); the rotating joint (222) is connected to the top of the liquid spraying main pipe (221); The liquid spray branch pipe (223) is bent, and one end of the liquid spray branch pipe (223) away from the rotating joint (222) sprays a first heat exchange medium to rotate the liquid spray branch pipe (223); The heat exchange unit (22) further comprises a spiral heat exchange tube (224), wherein a second heat exchange medium flows in the spiral heat exchange tube (224); The first heat exchange medium and the second heat exchange medium are both desalted water; The water outlet end of the spiral heat exchange tube (224) is in communication with the liquid spray main tube (221).

2. The hydrophobic expansion heat recovery device according to claim 1, characterized in that: The exhaust assembly (4) further comprises a second exhaust pipe (42), and the top of the drain tank (3) is connected to the first exhaust pipe (41) via the second exhaust pipe (42).

3. The hydrophobic expansion heat recovery device according to claim 1, wherein: The lengths of multiple said liquid spraying branch pipes (223) are not completely the same, so that the spraying areas of the liquid spraying branch pipes (223) with different lengths do not completely overlap.

4. The hydrophobic expansion heat recovery device according to claim 3, wherein: The spraying direction of the said liquid spraying branch pipe (223) is towards the upper oblique direction.

5. The hydrophobic expansion heat recovery device according to claim 1, characterized in that: The said condensation tank (2) further includes a condensation member (23), and the condensation member (23) is arranged in the said second exhaust port (212).

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