A steam exhaust recovery system

Abstract

The utility model relates to a steam recovery technical field, concretely provides a kind of with steam recovery system, comprising: first steam generator, steam safety valve, injection type mixed heat exchanger, condensate generator, phase-change heat accumulator, steam-water separator and hot water collector, wherein, injection type mixed heat exchanger has second inlet, second liquid inlet and second liquid outlet, second inlet is communicated with first outlet, and first on-off valve is arranged between second inlet and first outlet;Phase-change heat accumulator has third inlet, third liquid inlet and third liquid outlet, wherein third inlet is communicated with second inlet, and third liquid inlet is communicated with the liquid outlet end of first water pump.This utility model solves the problem of environmental pollution and energy waste caused by large amount of steam discharge in the prior art.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of exhausted steam recovery, and specifically provides an exhausted steam recovery system. BACKGROUND ART

[0002] Exhausted steam refers to water vapor that has completed work and needs to be discharged to the outside; it is relatively common in fields such as thermal power plants, steam power equipment matched with industrial boilers (such as steam-driven compressors and pumps), steam power devices for ships and locomotives, and energy circulation systems for cogeneration projects.

[0003] Discharging a large amount of exhausted steam into the air will cause corrosive damage to surrounding buildings such as steel structures, and also cause waste of a large amount of water resources and heat energy.

[0004] Therefore, it is of great significance to design a system capable of recovering and recycling exhausted steam. SUMMARY OF THE INVENTION

[0005] The utility model provides an exhausted steam recovery system, which solves the problems of environmental pollution and energy waste caused by large amount of exhausted steam discharge in the prior art.

[0006] The utility model provides an exhausted steam recovery system, comprising: a first exhausted steam generator having a first steam outlet; an exhausted steam safety valve communicated with the first steam outlet and configured to block and discharge exhausted steam from the first exhausted steam generator; a jet mixing heat exchanger having a second steam inlet, a second liquid inlet and a second liquid outlet, wherein the second steam inlet is communicated with the first steam outlet, and a first on-off valve is arranged between the second steam inlet and the first steam outlet; a condensed water generator communicated with the second liquid inlet, and a first water pump is arranged between the condensed water generator and the second liquid inlet; a phase change heat accumulator having a third steam inlet, a third liquid inlet and a third liquid outlet, wherein the third steam inlet is communicated with the second steam inlet, and the third liquid inlet is communicated with a liquid outlet end of the first water pump; a steam-water separator having a fourth liquid inlet, a fourth steam outlet and a fourth liquid outlet, wherein the fourth liquid inlet is respectively communicated with the third liquid outlet and the second liquid outlet; the fourth steam outlet is communicated with the second steam inlet; a hot water collector communicated with the fourth liquid outlet, and a second water pump is arranged between the hot water collector and the fourth liquid outlet.

[0007] The waste steam recovery system provided by this utility model further includes: a second waste steam generator having a fifth steam outlet, wherein the fifth steam outlet is connected to the third steam inlet and the second steam inlet respectively.

[0008] The waste steam recovery system provided by this utility model further includes: a third waste steam generator having a sixth steam outlet, wherein the sixth steam outlet is connected to the third steam inlet and the second steam inlet respectively.

[0009] According to the waste steam recovery system provided by this utility model, the first waste steam generator includes: a constant discharge expansion tank.

[0010] According to the waste steam recovery system provided by this utility model, the waste steam safety valve includes a water seal safety valve, the water seal safety valve includes a fifth liquid inlet, and the fifth liquid inlet is connected to the condensate generator.

[0011] According to the waste steam recovery system provided by this utility model, the jet-type mixing heat exchanger includes: a jet-type shock wave suction device, which is connected to the condensate generator.

[0012] According to the exhaust steam recovery system provided by this utility model, the exhaust pressure relief value of the water seal safety valve is 0.02 MPa.

[0013] The beneficial effects of this utility model are: This utility model provides a waste steam recovery system that effectively recovers waste steam emitted from a conventional first waste steam generator (i.e., a constant-discharge expansion vessel) by connecting a jet-type mixing heat exchanger, a condensate generator, and a steam-water separator to the steam outlet end of the expansion vessel. Simultaneously, the waste steam is liquefied by mixing with condensate to form hot water, which is then collected in a hot water collector. This allows for the collection of both the liquefied water from the waste steam and the heat from the waste steam for reuse. Specifically: By installing the exhaust steam safety valve, the exhaust steam discharged from the first exhaust steam generator can be blocked, causing it to be discharged to the jet-type mixing heat exchanger. At the same time, the exhaust steam safety valve also has a pressure safety mechanism. When the steam pressure in the pipeline exceeds the safety upper limit, the safety valve will automatically open to release pressure and prevent excessive pressure in the system from causing system damage.

[0014] The jet-type mixing heat exchanger can atomize the condensate from the condensate generator and create a negative pressure zone to continuously draw in the atomized water, which then mixes with the high-temperature exhaust steam in the heat exchange section. As the temperature decreases, most of the high-temperature exhaust steam liquefies into hot water and flows back to the hot water collector.

[0015] By setting up a phase change heat accumulator, it is possible to connect it to the first waste steam generator and the condensate generator respectively, thereby reducing the workload of the jet-type mixing heat exchanger and accelerating heat exchange and liquefaction efficiency.

[0016] By installing a steam-water separator, the steam-water mixture from the jet mixing heat exchanger and the phase change heat accumulator can be separated. The gas that cannot be liquefied temporarily is circulated to the steam inlet of the jet mixing heat exchanger to participate in secondary liquefaction; the liquefied hot water is transported to the hot water collector for secondary use.

[0017] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the first type of waste steam recovery system provided by this utility model; Figure 2 This is a schematic diagram of the second type of waste steam recovery system provided by this utility model; Figure 3 This is a schematic diagram showing the position of the first steam outlet in the first exhaust steam generator provided by this utility model; Figure 4 This is a schematic diagram showing the positions of the second steam inlet, the second liquid inlet, and the second liquid outlet in the jet-type mixing heat exchanger provided by this utility model. Figure 5 This is a schematic diagram showing the positions of the third steam inlet, the third liquid inlet, and the third liquid outlet in the phase change accumulator provided by this utility model. Figure 6 This is a schematic diagram showing the positions of the fourth liquid inlet, the fourth steam outlet, and the fourth liquid outlet in the steam-water separator provided by this utility model; Figure 7 This is a schematic diagram of the specific structure of the jet-type mixing heat exchanger provided by this utility model.

[0020] 1. First exhaust steam generator; 101. Stable exhaust expansion tank; 102. First steam outlet; 2. Exhaust steam safety valve; 201. Water seal safety valve; 202. Fifth liquid inlet; 3. Jet-type mixing heat exchanger; 301. Jet-type shock wave suction device; 302. Heat exchange section; 303. Second liquid inlet; 304. Second steam inlet; 305. Second liquid outlet; 4. Condensate generator; 5. Phase change heat accumulator; 501. Third steam inlet; 502. Third liquid inlet; 503. Third liquid outlet; 6. Steam-water separator; 601. Fourth liquid inlet; 602. Fourth steam outlet; 603. Fourth liquid outlet; 7. Hot water collector; 8. First on / off valve; 9. First water pump; 10. Second water pump; 11. Second waste steam generator; 12. Third waste steam generator. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0022] In the description of the embodiments of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this utility model. In addition, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0023] In the description of the embodiments of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this utility model based on the specific circumstances.

[0024] In this embodiment of the utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0025] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0026] The following is combined with Figures 1 to 7 The embodiments shown illustrate the technical solution of this utility model: This utility model embodiment provides a waste steam recovery system, such as Figures 1 to 6 As shown, it includes: The first exhaust steam generator 1 has a first steam outlet 102; The exhaust steam safety valve 2 is connected to the first steam outlet 102 and is used to block and drain the exhaust steam from the first exhaust steam generator 1. The jet-type mixing heat exchanger 3 has a second steam inlet 304, a second liquid inlet 303 and a second liquid outlet 305. The second steam inlet 304 is connected to the first steam outlet 102, and a first on / off valve 8 is provided between the second steam inlet 304 and the first steam outlet 102. A condensate generator 4 is connected to a second liquid inlet 303, and a first water pump 9 is provided between the condensate generator 4 and the second liquid inlet 303. The phase change heat storage device 5 has a third steam inlet 501, a third liquid inlet 502 and a third liquid outlet 503, wherein the third steam inlet 501 is connected to the second steam inlet 304 and the third liquid inlet 502 is connected to the liquid outlet of the first water pump 9. The steam-water separator 6 has a fourth liquid inlet 601, a fourth steam outlet 602 and a fourth liquid outlet 603, wherein the fourth liquid inlet 601 is connected to the third liquid outlet 503 and the second liquid outlet 305 respectively; the fourth steam outlet 602 is connected to the second steam inlet 304. The hot water collector 7 is connected to the fourth liquid outlet 603, and a second water pump 10 is located between the hot water collector 7 and the fourth liquid outlet 603.

[0027] In some embodiments, the first exhaust steam generator 1 can be a fixed discharge expansion vessel 101, boiler steam, urea product steam heat tracing condensate, boiler soot blowing condensate, etc., as long as it can realize the transportation of hot steam; the exhaust steam safety valve 2 can be a wet venting valve, a pilot-operated safety valve (including a pilot-operated pressure relief valve), or a water seal safety valve 201, etc., as long as it can realize the blocking of hot steam and the relief of overpressure; the jet mixing heat exchanger 3 can integrate a jet shock wave suction device 301 to realize the atomization and negative pressure of condensate; at the same time, it can also realize the mixing and heat exchange of hot steam and condensate.

[0028] This utility model provides a waste steam recovery system that effectively recovers waste steam emitted from the fixed-discharge expansion vessel 101 by connecting a jet-type mixing heat exchanger 3, a condensate generator 4, and a steam-water separator 6 to the steam outlet end of a conventional first waste steam generator 1, i.e., the fixed-discharge expansion vessel 101. Simultaneously, the waste steam is liquefied by mixing with condensate to form hot water, which is then recovered into a hot water collector 7. This allows for the collection of water resources from the liquefied waste steam, as well as the collection of heat from the waste steam for reuse. Specifically: By setting the exhaust steam safety valve 2, the exhaust steam discharged from the first exhaust steam generator 1 can be blocked, so that it is discharged to the jet-type mixing heat exchanger 3; at the same time, the exhaust steam safety valve 2 also has a pressure safety mechanism. When the steam pressure in the pipeline is greater than the safety upper limit, the safety valve will automatically open to release pressure and prevent the system from being damaged due to excessive pressure.

[0029] The jet-type mixing heat exchanger 3 can atomize the condensate from the condensate generator 4 and generate a negative pressure area to continuously draw in the atomized water, which then mixes with the high-temperature exhaust steam in the heat exchange section 302. When the temperature drops, most of the high-temperature exhaust steam liquefies into hot water and flows back to the hot water collector 7.

[0030] By setting up the phase change heat accumulator 5, it can be connected to the first exhaust steam generator 1 and the condensate generator 4 respectively, reducing the workload of the jet mixing heat exchanger 3 and accelerating the heat exchange and liquefaction efficiency.

[0031] By setting up the steam-water separator 6, the steam-water mixture from the jet mixing heat exchanger 3 and the phase change heat accumulator 5 can be separated. The gas that cannot be liquefied temporarily is circulated to the steam inlet of the jet mixing heat exchanger 3 to participate in secondary liquefaction; the liquefied hot water is transported to the hot water collector 7 for secondary use.

[0032] According to the waste steam recovery system provided by this utility model, such as Figures 2 to 6 As shown, it also includes: a second exhaust steam generator 11, which has a fifth steam outlet, and the fifth steam outlet is connected to the third steam inlet 501 and the second steam inlet 304 respectively.

[0033] In this embodiment, the second exhaust steam generator 11 is preferably a boiler soot blowing drain. Boiler soot blowing drain is a key step in ensuring the stable operation of the soot blowing system and preventing pipeline vibration. The core is to promptly discharge the condensate from the soot blowing steam. It automatically identifies and discharges the condensate through a steam trap (also known as a steam trap valve), while preventing steam leakage, without the need for manual intervention. The condensate is in a high-temperature and high-pressure state in the boiler. When it enters the atmospheric pressure pipeline of the exhaust steam recovery system, it instantly vaporizes into a large amount of steam, which then enters the jet-type mixing heat exchanger 3.

[0034] According to the waste steam recovery system provided by this utility model, such as Figure 2 As shown, it also includes: a third exhaust steam generator 12, which has a sixth steam outlet, and the sixth steam outlet is connected to the third steam inlet 501 and the second steam inlet 304 respectively.

[0035] In this embodiment, the third exhaust steam generator 12 is preferably a urea product steam heat tracing and hydrophobic device.

[0036] Steam tracing and condensate drainage for urea products is a crucial auxiliary step in urea production (especially in processes such as hydrolysis to ammonia). Its core function is to maintain the temperature of the urea solution or product steam pipeline through steam tracing, preventing crystallization, blockage, or corrosion. Simultaneously, it effectively recovers or discharges the condensate from the tracing steam, balancing system stability and energy efficiency. Its vaporization principle is similar to that of boiler soot blowing and condensate drainage.

[0037] According to the waste steam recovery system provided by this utility model, such as Figure 2 and Figure 3 As shown, the first exhaust steam generator 1 includes: a constant exhaust expansion vessel 101.

[0038] In this embodiment, the first exhaust steam generator 1 is preferably a fixed discharge expansion container 101. The fixed discharge expansion container 101 is the core equipment of the boiler blowdown system. Its main function is to depressurize, expand and flash steam the high-temperature and high-pressure sewage discharged from the boiler during regular blowdown (fixed discharge) to achieve steam-water separation and waste heat recovery, while reducing the discharge temperature and pressure to meet the requirements of subsequent treatment or discharge.

[0039] According to the waste steam recovery system provided by this utility model, such as Figure 2 As shown, the exhaust steam safety valve 2 includes a water seal safety valve 201, which includes a fifth liquid inlet 202 connected to the condensate generator 4.

[0040] The core advantage of the 201 water-sealed safety valve lies in its ability to achieve the dual functions of "overpressure protection + media sealing" at low cost. Especially in low-pressure, flammable / toxic media scenarios, it combines safety, reliability and ease of operation and maintenance.

[0041] The sealing fluid (usually water) in a water seal structure can physically isolate the system from air or ignition sources, making it particularly suitable for equipment storing / transporting flammable media (such as gas, fuel gas, and light hydrocarbons). Even if the system is overpressurized and pressure is released, the medium must pass through the water seal layer before being discharged, effectively preventing backflow of external ignition sources that could cause an explosion. This is a protective effect that ordinary spring-loaded safety valves cannot directly achieve.

[0042] Automatic operation is achieved by relying on the balance between the pressure of the medium itself and the static pressure of the water seal: when the system pressure exceeds the set value (the pressure corresponding to the water seal height), the medium will push open the water seal layer to release pressure; after the pressure drops to a safe value, the water seal automatically resets and seals, without the need for external power such as electricity or hydraulics, and can still work reliably under extreme working conditions such as power failure or steam failure.

[0043] In this embodiment, the steam discharge pressure of the water seal safety valve 201 is 0.02 MPa.

[0044] According to the waste steam recovery system provided by this utility model, such as Figure 7 As shown, the jet-type mixing heat exchanger 3 includes a jet-type shock wave suction device 301, which is connected to the condensate generator 4.

[0045] In this embodiment, the jet shock wave extractor 301 is integrated into the mixing heat exchanger. That is, condensate is first introduced into the jet shock wave extractor 301. A negative pressure field is formed by the high-speed jet of the working medium. Combined with the shock wave effect, the extraction and energy exchange efficiency is enhanced. Heat exchange is performed with high-temperature steam. Finally, the temperature is reduced to form a mixture of liquid water and hot steam, which is discharged to the steam-water separator 6.

[0046] This can improve heat exchange efficiency and also enable automated recycling.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A waste steam recovery system, characterized in that, include: The first exhaust steam generator has a first steam outlet; A waste steam safety valve, connected to the first steam outlet, is used to block and discharge the waste steam from the first waste steam generator; A jet-type mixing heat exchanger has a second steam inlet, a second liquid inlet, and a second liquid outlet. The second steam inlet is connected to the first steam outlet, and a first on / off valve is provided between the second steam inlet and the first steam outlet. A condensate generator is connected to the second liquid inlet, and a first water pump is provided between the condensate generator and the second liquid inlet; A phase change heat storage device has a third steam inlet, a third liquid inlet, and a third liquid outlet, wherein the third steam inlet is connected to the second steam inlet, and the third liquid inlet is connected to the liquid outlet of the first water pump. A steam-water separator has a fourth liquid inlet, a fourth steam outlet, and a fourth liquid outlet, wherein the fourth liquid inlet is connected to the third liquid outlet and the second liquid outlet, respectively; and the fourth steam outlet is connected to the second steam inlet. A hot water collector is connected to the fourth liquid outlet, and a second water pump is provided between the hot water collector and the fourth liquid outlet.

2. The waste steam recovery system according to claim 1, characterized in that, Also includes: The second exhaust steam generator has a fifth steam outlet, which is connected to the third steam inlet and the second steam inlet respectively.

3. The waste steam recovery system according to claim 1 or 2, characterized in that, Also includes: The third exhaust steam generator has a sixth steam outlet, which is connected to the third steam inlet and the second steam inlet respectively.

4. The waste steam recovery system according to claim 1, characterized in that, The first exhaust steam generator includes: a constant discharge expansion tank.

5. The waste steam recovery system according to claim 1, characterized in that, The exhaust steam safety valve includes a water seal safety valve, which has a fifth liquid inlet connected to the condensate generator.

6. The waste steam recovery system according to claim 1, characterized in that, The jet-type mixing heat exchanger includes a jet-type shock wave suction device, which is connected to the condensate generator.

7. The waste steam recovery system according to claim 5, characterized in that, The steam discharge pressure of the water seal safety valve is 0.02 MPa.

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