Drainage device with steam recovery function

Abstract

The utility model discloses a drainage device with a steam recovery function, which comprises a steam-liquid separation device, a flash tank and a regulating valve, the steam-liquid separation device comprises a steam-liquid separator, the steam-liquid separator is provided with a sealing tank, the sealing tank is provided with a first liquid inlet and a first liquid outlet arranged at the bottom of the sealing tank, and the first liquid inlet is communicated with the first liquid outlet. The first liquid inlet is suitable for being communicated with a steam outlet of heat exchange equipment; the flash tank comprises a tank body, a second liquid inlet formed in the tank body, a recovered steam outlet formed in the top of the tank body and a second liquid outlet formed in the bottom of the tank body, the second liquid inlet is communicated with the first liquid outlet through a pipeline, the recovered steam outlet is communicated with a steam pipe network, the second liquid outlet is communicated with a water and liquid drainage pipe, and a switch valve is arranged on the water and liquid drainage pipe; an adjusting valve is arranged on the pipeline between the second liquid inlet and the first liquid outlet; and an adjusting valve is arranged on the pipeline between the recycled steam outlet and the steam pipe network. The drainage device can solve the problems of unsmooth drainage and air leakage, is suitable for various complex working conditions, and achieves energy conservation and consumption reduction at the same time.

Description

Technical Field

[0001] The utility model belongs to the technical field of drainage, and in particular relates to a drainage device with a steam recovery function. Background Art

[0002] Steam is a widely used public engineering medium in industrial production equipment. After being used, steam will form steam condensate, which is usually discharged through a steam trap. If the condensate does not need to be recovered, the condensate after passing through the steam trap is directly discharged into the ditch or gravel through a pipeline. However, in most industrial situations, in order to save energy, the condensate needs to be collected through pipelines and recycled. Under such working conditions, the steam trap is prone to the following problems:

[0003] 1) The steam trap has too much leakage. Due to unreasonable selection of steam trap, poor precision, and leakage caused by erosion, flushing or cavitation after long-term use, the leakage will exceed the standard requirement by 3%. Excessive leakage will cause steam waste, vibration of condensate pipeline, and affect the deoxygenation effect of downstream devices.

[0004] 2) The steam trap is easy to clog. Steam pipes are mostly made of carbon steel. When the pipes are corroded, impurities such as iron ions are produced, which can easily clog the steam trap, resulting in poor condensate discharge and water hammer in the steam pipe network, leading to damage to pipes and equipment.

[0005] 3) The steam trap is not draining smoothly. When the steam system is running, if the air in the pipe network cannot be discharged through the exhaust hole of the steam trap, it will cause the steam trap to be air locked and the water will not drain smoothly;

[0006] 4) The heat exchange effect of the upstream heat exchange equipment is affected because the condensate pipeline is often long when the condensate is recovered, the back pressure of the steam trap is large, the selection is large, and there is too much water in front of the steam trap;

[0007] 5) Steam traps have limited application scenarios. Steam traps are not suitable for use in conditions with high steam consumption and high air pressure. Generally, multiple steam trap groups need to be installed, which increases costs.

[0008] Therefore, it is particularly necessary to develop a condensate removal device that can replace the function of the steam trap, is suitable for a variety of complex working conditions, can effectively solve the problems of poor drainage and large air leakage, and can realize energy recovery and reuse. Utility Model Content

[0009] The utility model aims to provide a drainage device which can solve the problems of poor drainage and air leakage, is suitable for various complex working conditions, and realizes energy saving and consumption reduction.

[0010] To solve the above problems, the utility model provides a drain device with steam recovery function, including a vapor-liquid separation device, the vapor-liquid separation device including a vapor-liquid separator, the vapor-liquid separator having a sealed tank, the sealed tank being provided with a first liquid inlet and a first liquid outlet provided at the bottom thereof, the first liquid inlet being suitable for being connected with the steam outlet of a heat exchange device; a flash tank, the flash tank including a tank body, a second liquid inlet provided at the tank body, a recovery steam outlet provided at the top of the tank body and a second liquid outlet provided at the bottom of the tank body, the second liquid inlet being connected with the first liquid outlet through a pipeline, the recovery steam outlet being connected with a steam pipe network, the second liquid outlet being connected with a drain pipe, and a switch valve being provided on the drain pipe; a regulating valve, a regulating valve being provided on the pipeline between the second liquid inlet and the first liquid outlet, and a regulating valve being provided on the pipeline between the recovery steam outlet and the steam pipe network.

[0011] The utility model of the steam-recovering device sends the steam-containing condensate after condensation of the heat exchange equipment into the sealed tank of the vapor-liquid separator from the first liquid inlet. The sealed tank is a closed pressurized container. The initial pressure in the tank is normal pressure. After the condensate enters the sealed tank, the condensate flashes into steam until the pressure in the tank reaches the saturated vapor pressure and then no longer flashes. After that, the internal pressure is equal to the saturated vapor pressure of the condensate, and only a small amount of flash steam is generated. When the liquid level in the tank reaches a certain height, the regulating valve between the first liquid outlet and the second liquid inlet is opened. By adjusting the opening of the regulating valve, the condensate in the vapor-liquid separation tank flows out from the first liquid outlet at the bottom of the sealed tank, while the steam does not flow out. The condensate that flows out is discharged from the second liquid inlet into the flash tank. The air pressure in the flash tank is set to a lower value, so that the inflowing condensate is fully flashed into secondary steam. The secondary steam is discharged from the recovery steam outlet at the top of the flash tank to the steam network to achieve secondary recycling of steam; the small amount of condensate left in the flash tank is discharged to the drain pipe through the second liquid outlet to avoid excessive water accumulation affecting the flash steam volume. In this way, the traditional steam trap is easily leaked, the water is not smooth, and the safety and service life of the equipment are affected. It is suitable for a variety of complex working conditions, and the efficiency of thermal energy utilization is improved to achieve energy saving and consumption reduction.

[0012] In some embodiments, a liquid level transmitter for detecting the height of the liquid level in the tank is provided on the sealed tank, and the liquid level transmitter is electrically connected to the regulating valve on the first liquid outlet. Thus, when the liquid level transmitter detects that the liquid level in the tank rises to a preset height, a signal is sent to the regulating valve to control the opening of the regulating valve between the first liquid outlet and the second liquid inlet, so that the condensate in the vapor-liquid separation tank flows out from the first liquid outlet at the bottom of the sealed tank, and the condensate flows out from the second liquid inlet to the flash tank.

[0013] In some embodiments, a liquid level transmitter is also provided on the tank body of the flash tank, and the liquid level transmitter is connected to the switch valve signal. Therefore, a small amount of liquid will accumulate in the flash tank during the flash process. When the liquid level transmitter detects that the liquid level reaches the upper limit of the liquid accumulation, it sends a signal to the switch valve to control the switch valve on the drain pipe to open, realize automatic drainage, and avoid excessive water accumulation affecting the flash steam volume.

[0014] In some embodiments, the switch valve is a manually controlled valve.

[0015] In some embodiments, a pressure transmitter for detecting the air pressure in the pipeline is provided on the pipeline connected to the recovery steam outlet, and the pressure transmitter is electrically connected to the regulating valve on the recovery steam outlet. Thus, when the pressure transmitter reaches a preset pressure, the opening of the regulating valve is controlled, thereby adjusting the pressure of the secondary steam according to the required pressure of the downstream steam network.

[0016] In some embodiments, the vapor-liquid separation device includes a plurality of vapor-liquid separators arranged in parallel, and the first liquid outlet of each vapor-liquid separator is connected to the second liquid inlet through a pipeline, thereby being applicable to heat exchange of high-pressure steam of various specifications.

[0017] In some embodiments, the vapor-liquid separation device includes two vapor-liquid separators arranged in parallel, namely a first vapor-liquid separator and a second vapor-liquid separator.

[0018] In some embodiments, the gas pressure in the flash tank is lower than 0.3 MPa, so that most of the saturated condensate is flashed into low-pressure steam to facilitate flash evaporation.

[0019] In some embodiments, a baffle is provided inside the sealed tank, thereby increasing the length of the steam flow path, further allowing a portion of the flash steam in the sealed tank to condense, and reducing the amount of flash steam. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of a hydrophobic device with a steam recovery function according to one embodiment of the utility model.

[0021] In the figure:

[0022] 1. Heat exchange equipment; 2. Vapor-liquid separation device; 21. First vapor-liquid separator; 22. Second vapor-liquid separator; 23. Sealed tank; 231. First liquid inlet; 232. First liquid outlet; 3. Flash tank; 31. Second liquid inlet; 32. Recovery steam outlet; 33. Second liquid outlet; 4. Steam pipe network; 5. Drain pipe; 6. Regulating valve; 7. Switch valve; 8. Liquid level transmitter; 9. Pressure transmitter. DETAILED DESCRIPTION

[0023] The utility model is further described in detail below in conjunction with the accompanying drawings.

[0024] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "rear", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present utility model. In addition, the terms "first", "second", etc. are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. The terms "include", "comprise", "have" and their variations all mean "including but not limited to", unless otherwise specifically emphasized.

[0025] Figure 1 The following schematically shows a steam trap with steam recovery function according to an embodiment of the present invention. Figure 1 As shown, the hydrophobic device includes a vapor-liquid separation device 2, a flash tank 3, and a regulating valve 6. The vapor-liquid separation device 2 includes a vapor-liquid separator (such as Figure 1 The first vapor-liquid separator 21 or the second vapor-liquid separator 22 in the embodiment of the present invention is a vapor-liquid separator, the vapor-liquid separator comprises a sealed tank 23, the sealed tank 23 is provided with a first liquid inlet 231 and a first liquid outlet 232 arranged at the bottom thereof, the first liquid inlet 231 is suitable for being connected with the steam outlet of the heat exchange device 1; the flash tank 3 comprises a tank body, a second liquid inlet 31 arranged on the tank body, a recovery steam outlet 32 ​​arranged at the top of the tank body and a second liquid outlet 33 arranged at the bottom of the tank body, the second liquid inlet 31 is connected with the first liquid outlet 232 through a pipeline, the recovery steam outlet 32 ​​is connected with the steam pipe network 4, the second liquid outlet 33 is connected with the drain pipe 5, and the drain pipe 5 is provided with a switch valve 7; a regulating valve 6 is provided on the pipeline between the second liquid inlet 31 and the first liquid outlet 232, and a regulating valve 6 is provided on the pipeline between the recovery steam outlet 32 ​​and the steam pipe network 4.

[0026] The utility model of the hydrophobic device with steam recovery function sends the steam-containing condensate after condensation of the heat exchange device 1 into the sealed tank 23 of the vapor-liquid separator from the first liquid inlet 231. The sealed tank 23 is a closed pressurized container. The initial pressure in the tank is normal pressure. After the condensate enters the sealed tank 23, the condensate flashes into steam until the pressure in the tank reaches the saturated vapor pressure and then no longer flashes. After that, the internal pressure is equal to the saturated vapor pressure of the condensate, and only a small amount of flash steam is generated. When the liquid level in the tank reaches a certain height, the regulating valve 6 between the first liquid outlet 232 and the second liquid inlet 31 is opened. By adjusting the opening of the regulating valve 6, the condensate in the vapor-liquid separation tank flows out from the first liquid outlet 232 at the bottom of the sealing tank 23, while the steam does not flow out. The condensate that flows out is discharged from the second liquid inlet 31 into the flash tank 3. The air pressure in the flash tank 3 is set to a lower value, so that the inflowing condensate is fully flashed into secondary steam, and the secondary steam is discharged from the recovery steam outlet 32 ​​at the top of the flash tank 3 to the steam pipe network 4, so as to realize the secondary recycling of steam; the small amount of condensate left in the flash tank 3 is discharged to the drain pipe 5 through the second liquid outlet 33 to avoid excessive water accumulation affecting the flash steam volume. In this way, the problems of easy leakage of traditional steam traps, poor drainage, and affecting equipment safety and service life are solved, and it is applicable to a variety of complex working conditions, and the efficiency of thermal energy utilization is improved to achieve energy saving and consumption reduction.

[0027] When the high-pressure steam passing through the heat exchange equipment has multiple specifications (such as Figure 1 The high-pressure steam 1 and high-pressure steam 2 shown in the figure may be provided with a plurality of vapor-liquid separators to separate the vapor in the condensate. In the present embodiment, the vapor-liquid separation device 2 comprises a plurality of vapor-liquid separators arranged in parallel, and the first liquid outlet 232 of each vapor-liquid separator is connected to the second liquid inlet 31 through a pipeline, and the flash tank 3 shares one. To ensure that the condensate discharged from the first liquid outlet 232 smoothly enters the flash tank 3, it is sufficient to ensure that the back pressure in the pipeline connected to the first liquid outlet 232 of each vapor-liquid separator is consistent.

[0028] In another embodiment, Figure 1 As shown, the vapor-liquid separation device 2 includes two vapor-liquid separators arranged in parallel, namely a first vapor-liquid separator 21 and a second vapor-liquid separator 22, each connected to a heat exchange device (1, 1 ， ), realizing the recovery and drainage function of condensate after heat exchange of two different specifications of high-pressure steam.

[0029] Preferably, a liquid level transmitter 8 is provided on the sealed tank 23 to detect the height of the liquid level in the sealed tank 23. The liquid level transmitter 8 is electrically connected to the regulating valve 6 on the first liquid outlet 232. When the liquid level transmitter 8 detects that the liquid level in the tank rises to a preset height, it sends a signal to the regulating valve 6 to control the opening of the regulating valve 6 between the first liquid outlet 232 and the second liquid inlet 31, so that the condensate in the vapor-liquid separation tank flows out from the first liquid outlet 232 at the bottom of the sealed tank 23, and the condensate flows out from the second liquid inlet 31 to the flash tank 3. Further, a liquid level transmitter 8 is also provided on the tank body of the flash tank 3. The liquid level transmitter 8 is signal-connected to the switch valve 7. A small amount of liquid will accumulate in the flash tank 3 during the flash process. When the liquid level transmitter 8 detects that the liquid level reaches the upper limit of the liquid accumulation, it sends a signal to the switch valve 7 to control the switch valve 7 on the drain pipe 5 to open, so as to achieve automatic drainage and avoid excessive water accumulation affecting the amount of flash steam. Of course, in other embodiments, the switch valve 7 may also be a manually controlled valve.

[0030] In a preferred embodiment, a pressure transmitter 9 is provided on the pipeline connected to the recovery steam outlet 32. The pressure transmitter 9 is used to detect the air pressure in the pipeline. The pressure transmitter 9 is electrically connected to the regulating valve 6 on the recovery steam outlet 32. When the pressure transmitter 9 reaches a preset pressure, the opening of the regulating valve 6 is controlled, thereby adjusting the pressure of the secondary steam according to the required pressure of the downstream steam network 4.

[0031] Furthermore, a baffle (not shown) is provided inside the gas-liquid separator sealed tank 23. The setting of the baffle can increase the length of the steam flow path, further condense part of the flash steam in the sealed tank 23, and reduce the amount of flash steam.

[0032] Further preferably, the operating gas pressure in the flash tank 3 is set below 0.3 MPa to facilitate flash evaporation, so that most of the saturated condensate is flashed into low-pressure steam, which is led out through the recovery steam outlet 32 ​​on the top of the flash tank 3 to the steam pipe network 4 with matching pressure and temperature to achieve secondary recovery and utilization.

[0033] The steam trap device with steam recovery function of the utility model can solve the problems of easy leakage of traditional steam traps, poor drainage, and impact on equipment safety and service life by connecting a vapor-liquid separator and a flash tank 3 after the heat exchange equipment 1. It is suitable for a variety of complex working conditions, improves the efficiency of heat energy utilization, and achieves energy saving and consumption reduction.

[0034] The above are only some embodiments of the present invention. For those skilled in the art, several modifications and improvements can be made without departing from the inventive concept of the present invention. Therefore, the present invention is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope of protection of the present invention.

Claims

1. A steam trap with steam recovery function, characterized in that: include: A vapor-liquid separation device, the vapor-liquid separation device comprising a vapor-liquid separator, the vapor-liquid separator having a sealed tank, the sealed tank being provided with a first liquid inlet and a first liquid outlet provided at the bottom thereof, the first liquid inlet being suitable for communicating with a steam outlet of a heat exchange device; A flash tank, the flash tank comprising a tank body, a second liquid inlet provided on the tank body, a recovery steam outlet provided on the top of the tank body and a second liquid outlet provided on the bottom of the tank body, the second liquid inlet is connected to the first liquid outlet through a pipeline, the recovery steam outlet is connected to the steam pipe network, the second liquid outlet is connected to a drain pipe, and a switch valve is provided on the drain pipe; A regulating valve is provided on the pipeline between the second liquid inlet and the first liquid outlet, and the regulating valve is provided on the pipeline between the recovered steam outlet and the steam network.

2. The steam trap with steam recovery function according to claim 1, characterized in that: The sealed tank is provided with a liquid level transmitter for detecting the height of the liquid level in the tank, and the liquid level transmitter is electrically connected to the regulating valve on the first liquid outlet.

3. The drain device with steam recovery function according to claim 2, characterized in that: The tank body of the flash tank is also provided with the liquid level transmitter, and the liquid level transmitter is connected with the switch valve signal.

4. The drain device with steam recovery function according to claim 1, characterized in that: The switch valve is a manual control valve.

5. The drain device with steam recovery function according to claim 1, characterized in that: A pressure transmitter for detecting the air pressure in the pipeline is provided on the pipeline communicating with the recovery steam outlet, and the pressure transmitter is connected to the regulating valve on the recovery steam outlet via an electrical signal.

6. The drain device with steam recovery function according to any one of claims 1 to 5, characterized in that: The vapor-liquid separation device comprises a plurality of vapor-liquid separators arranged in parallel, and the first liquid outlet of each vapor-liquid separator is connected to the second liquid inlet through a pipeline.

7. The drain device with steam recovery function according to claim 6, characterized in that: The vapor-liquid separation device comprises two vapor-liquid separators arranged in parallel, namely a first vapor-liquid separator and a second vapor-liquid separator.

8. The drain device with steam recovery function according to any one of claims 1 to 5, characterized in that: The gas pressure in the flash tank is lower than 0.3 MPa.

9. The drain device with steam recovery function according to any one of claims 1 to 5, characterized in that: A baffle is arranged inside the sealed tank.

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