A hydrophobic structure

Abstract

This invention provides a hydrophobic structure, including a connecting pipe connected to a flash tank, a pressure control valve, and a discharge silencer. The connecting pipe includes a receiving section, a throttling section, and a drainage section connected in sequence. The throttling section has an orifice plate connected to the end of the receiving section. The drainage section extends away from the orifice plate and includes a condensation section and a water outlet section arranged parallel to each other, and a water storage section connecting the condensation section and the water outlet section. The high end of the condensation section is connected to the orifice plate, and the water storage section is connected to the low ends of both the condensation section and the water outlet section. The length of the water outlet section is shorter than the length of the condensation section. This invention solves the problem that existing hydrophobic structures cannot effectively drain accumulated water.

Description

Technical Field

[0001] This utility model relates to the field of steam emission technology, and in particular to a hydrophobic structure. Background Technology

[0002] In chemical and energy industries, flash steam tanks and deaerators are common pieces of equipment. These devices require a certain positive pressure, which is typically achieved at the top using pressure control valves and steam exhaust silencers. Due to steam condensation, large amounts of water often accumulate inside the steam exhaust silencer and in the bottom connecting pipes. If this water is not drained promptly, it can cause vibration and damage to the pipes and the silencer itself, or water may overflow from the silencer outlet, posing a safety hazard. In severe cases, it can affect steam discharge and the pressure control of the flash tank and deaerator. Many sites use ordinary steam traps installed on the bottom pipes of the silencer. However, because the pressure at this discharge point is very low and scale easily forms, ordinary steam traps often become clogged and fail to effectively prevent steam from escaping. Utility Model Content

[0003] To address the shortcomings of existing technologies, this invention provides a hydrophobic structure that solves the problem that existing hydrophobic structures cannot effectively drain accumulated water.

[0004] According to the embodiments of this utility model, the following technical solution is adopted:

[0005] A hydrophobic structure includes a connecting pipe connected to a flash tank, a pressure control valve, and a discharge silencer. The connecting pipe includes a receiving section, a throttling section, and a drainage section connected in sequence. The throttling section is provided with an orifice plate connected to the end of the receiving section. The drainage section extends in a direction away from the orifice plate. The drainage section includes a condensation section and a water outlet section arranged parallel to each other, and a water storage section connecting the condensation section and the water outlet section. The high end of the condensation section is connected to the orifice plate, and the water storage section is connected to the low ends of the condensation section and the water outlet section respectively.

[0006] The length of the water outlet section is less than the length of the condensation section.

[0007] Preferably, a first drain valve is provided between the receiving section and the throttling section, and the diameter of the first drain valve is not less than the diameter of the receiving section and / or the throttling section.

[0008] Preferably, the thickness of the perforated plate is 5-15 mm, and the inlet end of the perforated plate is chamfered.

[0009] Preferably, an extension section is provided between the condensation section and the throttling section, the extension section is set at an angle to the throttling section, and the diameter of the extension section is not less than the diameter of the throttling section.

[0010] Preferably, the condensation section is made of stainless steel; and / or

[0011] The length of the condensation section is greater than or equal to the length of the connecting pipe.

[0012] Preferably, the water outlet section is equipped with a second drain valve.

[0013] Preferably, the end of the water outlet section is provided with a rain cap, which has an umbrella-shaped structure.

[0014] Compared with the prior art, this utility model has the following advantages: by optimizing the design of the connecting pipe, it replaces the ordinary steam trap, thereby optimizing costs, improving operational reliability and safety, automatically removing condensate and preventing steam leakage. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the hydrophobic structure in one embodiment of the present invention.

[0016] In the above attached diagram: 1. Flash tank; 2. Pressure control valve; 3. Discharge silencer; 4. Inlet section; 5. Throttling section; 51. Orifice plate; 6. Condensation section; 7. Extension section; 8. Water storage section; 9. Drainage section; 10. Rain cap; 11. First drain valve; 12. Second drain valve. Detailed Implementation

[0017] To make the objectives, technical solutions, and beneficial effects of this utility model clearer, the technical solutions of this utility model are further described below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this utility model and are not intended to limit it.

[0018] See Figure 1 This utility model provides a hydrophobic structure, including a connecting pipe connected to a flash tank 1, a pressure control valve 2, and a discharge silencer 3. The connecting pipe includes a receiving section 4, a throttling section 5, and a drainage section 9 connected in sequence. The throttling section 5 is provided with an orifice plate 51, which is connected to the end of the receiving section 4. The drainage section 9 extends in a direction away from the orifice plate 51. The drainage section 9 includes a condensation section 6 and a water outlet section arranged in parallel with each other, and a water storage section 8 connecting the condensation section 6 and the water outlet section. The high end of the condensation section 6 is connected to the orifice plate 51, and the water storage section 8 is connected to the low end of the condensation section 6 and the water outlet section respectively.

[0019] The length of the water outlet section is less than the length of the condensation section 6.

[0020] In this embodiment, the receiving section 4 is used to connect to the flash tank 1, serving as the steam inlet and introducing the steam to be discharged into the hydrophobic structure. The throttling section 5 is connected to the end of the receiving section 4 and is equipped with an orifice plate 51, which replaces the complex throttling valve in the traditional structure. The small holes on the orifice plate 51 generate huge resistance to the steam fluid, playing a role in throttling and pressure reduction. After the high-pressure steam passes through the small holes, the pressure drops sharply, and the volume expands rapidly, with some flashing into secondary steam. The high end of the drainage section 9 is connected to the end of the water-saving section, and the other end extends in the opposite direction. The drainage section 9 includes a condensing section 6 and a water outlet section arranged in parallel, as well as a water storage section 8 for connecting the condensing section 6 and the water outlet section. The high end of the condensing section 6 is connected to the water-saving section and extends downward to receive the steam-water mixture flowing out after throttling from the orifice plate 51, and to allow the secondary steam in the mixture to undergo heat exchange and condense into water. The water storage section 8 is connected to the lowest point of the condensing section 6 and the water outlet section, and is used to connect the condensing section 6 and the water outlet section. A U-shaped water seal is formed between the two sections. The accumulated water effectively prevents the steam in the main steam pipe from escaping directly without condensation, thus achieving the function of steam blocking. The outlet section extends upward from the low end of the storage section 8 and smoothly discharges the condensate after cooling and separation. Specifically, the high-temperature and high-pressure steam in the flash tank 1 flows into the receiving section 4 under the action of the pressure control valve 2 and passes through the orifice plate 51. When the fluid passes through the small holes of the orifice plate 51, it is throttled, and the pressure drops sharply. Some of the high-temperature condensate will flash into low-pressure secondary steam, forming a steam-water mixture. The steam-water mixture enters the condensation section 6. The secondary steam dissipates heat on the pipe wall of the condensation section 6 and gradually re-liquefies. The condensed water and a small amount of uncondensed steam enter the storage section 8. The water accumulates at the bottom of the storage section 8 to form a reliable water seal, which always prevents the steam from escaping downstream. When the water level in the storage section 8 accumulates high enough, exceeding the highest point of the outlet section, the condensate is smoothly discharged through the shorter outlet section under the action of gravity.

[0021] A first drain valve 11 is provided between the receiving section 4 and the throttling section 5, and the diameter of the first drain valve 11 is not less than the diameter of the receiving section 4 and the throttling section 5.

[0022] In this embodiment, when the steam system is started from a cold state or restarted after a long period of shutdown, a large amount of condensate will accumulate in the connecting pipes and flash tank 1. If this large amount of liquid water is directly pushed through the narrow orifice plate 51 by high-pressure steam, it will instantly generate a huge impact force, which will seriously impact, vibrate, or even damage the connecting pipes. The first drain valve 11 provides a low-resistance, high-flow bypass channel. At the initial stage of steam system startup, the first drain valve 11 can be opened manually or automatically to allow the large amount of condensate accumulated in the inlet section 4 to flow through. The condensate does not pass directly through the orifice plate 51, thus avoiding a large amount of liquid water passing directly through the orifice plate 51 under high pressure differential. To ensure that the condensate can pass through without stagnation, the inlet of the first drain valve 11 is connected to the lowest point of the receiving section 4, and the outlet of the first drain valve 11 is connected to the inlet of the throttling section 5. The diameter of the first drain valve 11 is larger than the diameter of the receiving section 4 and the throttling section 5. The first drain valve 11 provides a drain channel, and the operator can open this valve periodically to flush away any impurities or sediments that may accumulate in the receiving section 4.

[0023] The thickness of the perforated plate 51 is 5-15 mm, and the inlet end of the perforated plate 51 is chamfered.

[0024] In this embodiment, the thickness of the orifice plate 51 is set to 10 mm. The orifice plate 51 needs to withstand the high-speed scouring of steam and condensate and possible corrosion. Its edges are easily damaged by erosion, and the orifice diameter becomes larger, which leads to the failure of the throttling effect and steam leakage. A chamfer is provided at one end of the orifice plate 51 near the receiving section 4, which can significantly reduce local resistance so that the fluid can be guided into the orifice plate 51 more smoothly and gradually.

[0025] An extension section 7 is provided between the condensation section 6 and the throttling section 5. The extension section 7 is set at an angle to the throttling section 5, and the diameter of the extension section 7 is not less than the diameter of the throttling section 5.

[0026] In this embodiment, an extension section 7 is provided between the throttling section 5 and the condensing section 6. The extension section 7 is set at an angle to the throttling section 5, and its diameter is larger than that of the throttling section 5. This is used to improve the condensation efficiency. The high-speed, mist-filled steam-water mixture ejected from the orifice plate 51 is a high-speed mixture. If it is allowed to directly enter the condensing section 6, the flow rate will be too fast and the residence time will be short. The steam that has not yet condensed may be carried out with the water flow. The extension section 7 increases the heat dissipation area and length, and its angle with the throttling section 5 prolongs the residence time of the steam, thus increasing the residence time of the steam mixture in the pipe.

[0027] The condensation section 6 is made of stainless steel; the length of the condensation section 6 is greater than or equal to the length of the receiving section 4.

[0028] In this embodiment, the condensing section 6 is made of stainless steel, which has good thermal conductivity, maintaining a continuous and stable condensation efficiency and avoiding the problem of decreased thermal conductivity due to rust and scale buildup, thus affecting the steam condensation effect. The length of the condensing section 6 should be set to be more than twice the length of the receiving section 4 to provide an absolutely sufficient path and time for the steam to fully condense. Designing the condensing section 6 to be long enough can ensure that the secondary steam coming out of the orifice plate 51 can be completely condensed into water, with only liquid water entering the water storage section 8, minimizing steam waste and fully recovering the energy of the steam for the heating system, thereby improving the thermal efficiency of the entire steam system and achieving significant energy-saving effects.

[0029] The water outlet section is equipped with a second drain valve 12.

[0030] In this embodiment, the second drain valve 12 is located in the water outlet section to collect the scale and dirt retained in the condensate. Opening the second drain valve 12 can completely drain the condensate in the water outlet section and the water storage section 8, preventing the condensate from freezing and corroding in the water storage section 8 in winter, and providing a dry environment for pipeline maintenance.

[0031] The end of the water outlet section is provided with a rain cap 10, which has an umbrella-shaped structure.

[0032] In this embodiment, when the drain outlet of the hydrophobic structure is located outdoors, during heavy rain or storms, rainwater may fall directly into or enter the vertical outlet through wind pressure. The influx of a large amount of rainwater will dilute the high-temperature condensate in the water storage section 8. The continuous inflow of rainwater will cause the water level in the water storage section 8 to rise continuously, eventually overflowing the highest point and flowing into the condensation section 6, or even backflowing into the flash tank 1 through the throttling section 5. The end result is the destruction of the water seal established by the U-shaped water storage section 8. Once the water seal fails, the high-pressure steam in the main steam pipe will overflow directly from the drain outlet without hindrance, causing energy waste and completely rendering the hydrophobic structure ineffective. The umbrella-shaped rain cap 10, as a physical barrier, is located at the drain outlet and can effectively block and guide rainwater out, preventing it from falling vertically into the drain outlet. This ensures that under severe weather conditions, external rainwater cannot enter the interior of the hydrophobic structure, guaranteeing the integrity and functionality of the U-shaped water seal.

[0033] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A hydrophobic structure, comprising connecting pipes connected to a flash tank, a pressure control valve, and a discharge silencer, characterized in that, The connecting pipe includes a receiving section, a throttling section, and a drainage section connected in sequence. The throttling section is provided with an orifice plate, which is connected to the end of the receiving section. The drainage section extends in a direction away from the orifice plate. The drainage section includes a condensation section and a water outlet section arranged in parallel with each other, and a water storage section connecting the condensation section and the water outlet section. The high end of the condensation section is connected to the end of the throttling section, and the water storage section is connected to the low ends of the condensation section and the water outlet section respectively. The length of the water outlet section is less than the length of the condensation section.

2. The hydrophobic structure according to claim 1, characterized in that, A first drain valve is provided between the receiving section and the throttling section, and the diameter of the first drain valve is not less than the diameter of the receiving section and / or the throttling section.

3. The hydrophobic structure according to claim 2, characterized in that, The thickness of the orifice plate is 5-15 mm, and the inlet end of the orifice plate is chamfered.

4. The hydrophobic structure according to claim 1, characterized in that, An extension section is provided between the condensation section and the throttling section. The extension section is set at an angle to the throttling section, and the diameter of the extension section is not less than the diameter of the throttling section.

5. The hydrophobic structure according to claim 4, characterized in that, The condensation section is made of stainless steel; and / or The length of the condensation section is greater than or equal to the length of the receiving section.

6. The hydrophobic structure according to claim 5, characterized in that, The water outlet section is equipped with a second drain valve.

7. The hydrophobic structure according to any one of claims 2-5, characterized in that, The end of the water outlet section is equipped with a rain cap, which has an umbrella-shaped structure.

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