CN114684883A - Device and method for improving vacuum degree of low-temperature multi-effect seawater desalination device - Google Patents
Device and method for improving vacuum degree of low-temperature multi-effect seawater desalination device Download PDFInfo
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- CN114684883A CN114684883A CN202210615375.3A CN202210615375A CN114684883A CN 114684883 A CN114684883 A CN 114684883A CN 202210615375 A CN202210615375 A CN 202210615375A CN 114684883 A CN114684883 A CN 114684883A
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/02—Treatment of water, waste water, or sewage by heating
- C02F1/04—Treatment of water, waste water, or sewage by heating by distillation or evaporation
- C02F1/06—Flash evaporation
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/08—Seawater, e.g. for desalination
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/124—Water desalination
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Abstract
The invention relates to the technical field of seawater desalination, in particular to a device and a method for improving the vacuum degree of a low-temperature multi-effect seawater desalination device, wherein the IPC classification is C02F, the device comprises a flash tank blow-off pipe vacuum isolation device, a main steam flange metal sealing system and a manhole door integrated rubber sealing device, the flash tank blow-off pipe vacuum isolation device and the integrated rubber sealing device are both arranged in the seawater desalination device, and the main steam flange metal sealing system is connected to the upper end of the seawater desalination device; the flash tank blow-off pipe vacuum isolation device comprises a flash tank, a blow-off pipeline and a recovery pipe ditch, wherein the flash tank is arranged at the upper end of the blow-off pipeline, and the flash tank is communicated with the blow-off pipeline. The device has the advantages of simple structure, convenient operation, reliable operation and low cost, realizes the design optimization of the original vacuum leaking position of the low-temperature multi-effect seawater desalting device, and avoids the problem of vacuum degree reduction of the device caused by long-time operation.
Description
Technical Field
The invention relates to the technical field of seawater desalination, in particular to a device and a method for improving the vacuum degree of a low-temperature multi-effect seawater desalination device, wherein the IPC classification number is C02F.
Background
At present, a low-temperature multi-effect seawater desalination device adopts a multi-stage flash evaporation method to realize seawater desalination so as to produce fresh water, the vacuum degree of the low-temperature multi-effect seawater desalination device reflects the sealing condition of each stage of effect body device, the sealing condition is better, and the higher the vacuum degree of the device in a negative pressure state is, the easier the vacuum degree is to maintain. The higher vacuum degree can better maintain the negative pressure condition inside the seawater desalination device, avoid water quality fluctuation and improve the heat exchange efficiency. Therefore, the vacuum degree is an important index influencing the multistage flash evaporation efficiency and the desalted water yield of the low-temperature multi-effect device, and the higher the vacuum degree of the device is, the higher the flash evaporation efficiency of the device is, and the higher the water yield under the same working condition is.
However, the vacuum degree of the low-temperature multi-effect seawater desalination device in the prior art is reduced after the device is put into operation for a period of time, which is mainly caused by leakage of sealing surfaces of pipelines and valves. The reduction of the vacuum degree can further lead to the reduction of the flash evaporation effect of the equipment and the reduction of the water production efficiency. Because the low-temperature multi-effect seawater desalination device has a plurality of valves, pipelines and flange joints, the vacuum degree is extremely difficult to be checked after the vacuum degree is reduced.
Therefore, the application especially provides a device and a method for improving the vacuum degree of a low-temperature multi-effect seawater desalination device so as to solve the technical problems.
Disclosure of Invention
The invention aims to provide a device and a method for improving the vacuum degree of a low-temperature multi-effect seawater desalination device.
The technical scheme adopted by the invention for solving the technical problems is as follows: a device for improving the vacuum degree of a low-temperature multi-effect seawater desalination device comprises a flash tank blow-off pipe vacuum isolation device, a main steam flange metal sealing system and a manhole door integrated rubber sealing device, wherein the flash tank blow-off pipe vacuum isolation device and the integrated rubber sealing device are both arranged in the seawater desalination device, and the main steam flange metal sealing system is connected to the upper end of the seawater desalination device;
the vacuum isolation device for the blow-off pipe of the flash tank comprises the flash tank, the blow-off pipe and a recovery pipe ditch, wherein the flash tank is arranged at the upper end of the blow-off pipe, the flash tank is communicated with the blow-off pipe, an electric ball valve and a manual isolation door are arranged on the blow-off pipe, the recovery pipe ditch is arranged at the lower end of the blow-off pipe, a plurality of blow-off pipes are arranged on the recovery pipe ditch in parallel, and the recovery pipe ditch is communicated with the blow-off pipe;
the manhole door integrated rubber sealing device comprises a manhole frame, a manhole cover plate and an integrated sealing rubber ring, wherein the manhole cover plate is connected to the inside of the manhole frame, and the integrated sealing rubber ring is bonded on the inner wall of the manhole frame;
the main steam flange metal sealing system comprises a main steam pipeline and a main steam pipeline flange, wherein a plurality of main steam pipeline flanges are connected to the lower end of the main steam pipeline, and the main steam pipeline is connected with the seawater desalination device through the main steam pipeline flange.
Furthermore, one side of manhole cover plate is connected with the door-hinge, and manhole cover plate passes through the rotation connection each other between door-hinge and the manhole frame.
Furthermore, the main steam pipeline flange is made of carbon steel and is used for connecting and supporting pipelines and conveying steam.
Furthermore, the diameter of the main steam pipeline is 1200mm, and the main steam pipeline is made of carbon steel.
Further, the manhole frame and the manhole cover plate are fixed with each other through a plurality of fixing bolts.
A method for improving the vacuum degree of a low-temperature multi-effect seawater desalination device comprises a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by a flash tank blow-off pipe vacuum isolation device, a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by a main steam flange metal sealing system and a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by a manhole door integrated rubber sealing device;
the method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by the flash tank blow-off pipe vacuum isolation device comprises the following steps:
step A1, an installation test, namely installing the flash tank blow-off pipe vacuum isolation device when the seawater desalination device is stopped, then carrying out a vacuum-pumping test on the vacuum isolation device, and checking the sealing and leakage conditions of the flash tank blow-off pipe vacuum isolation device;
step A2, observing the change speed of the vacuum degree of the seawater desalination device per hour within 2 days after the flash tank blow-off pipe vacuum isolation device is installed;
step A3 operation: when the seawater desalination device is stopped, an electric ball valve and a manual isolation door on a sewage discharge pipeline are opened, and water stored in the flash tank is discharged through the sewage discharge pipeline;
step A4, when the seawater desalination device is in vacuum maintenance after shutdown, closing an electric ball valve and a manual isolation door of a sewage discharge pipeline to seal a flash tank and improve the vacuum degree of the system;
step A5, when the seawater desalination device is started, closing the electric ball valve of the sewage pipeline, and opening the manual isolation door, so as to conveniently run and start remote control for temporary drainage, ensure the vacuum of the effect body and improve the starting speed;
step A6, when the operation of the device is stable after the device is started, the manual isolating door of the sewage pipeline is closed;
the method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by the main steam flange metal sealing system comprises the following steps:
step B1, when the seawater desalination device is stopped, closing the air inlet electric door of the main steam pipeline, opening the effect body vacuum breaking valve, and then disassembling the polytetrafluoroethylene rubber sealing gasket of the flange of the main steam pipeline and replacing the polytetrafluoroethylene rubber sealing gasket with a metal winding sealing gasket;
step B2, performing vacuum maintenance experiment on the seawater desalination device, closing the effect body vacuum destruction valve and all the sewage discharge doors, performing vacuum-pumping experiment, and checking the sealing and leakage conditions of the newly-installed metal winding pad;
step B3, observing the change speed of the vacuum degree of the seawater desalination device per hour within 2 days after the main steam flange metal sealing system is installed;
step B4, when the seawater desalination device is started, opening an air inlet electric door of the main steam pipeline, checking the pressure-resistant condition of a metal sealing gasket of a flange of the main steam pipeline, whether steam leaks or not, and recovering the heat preservation of the main steam pipeline and the flange of the main steam pipeline after all tests are qualified;
step B5, when the seawater desalination device operates normally, the main steam pipeline flange metal sealing system realizes the sealing and vacuum degree protection functions of the TVC rear steam pipeline;
the method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using the manhole door integrated rubber sealing device comprises the following steps:
step C1, when the seawater desalination device is stopped, closing the air inlet electric door of the main steam pipeline, opening the effect body vacuum breaking valve, detaching the fixing bolt of the manhole door, and opening the manhole cover plate;
step C2, disassembling the original lap joint type sealing rubber strip, and cleaning the original sealant residue with ether to ensure the surface of the manhole frame to be clean and flat;
c3, coating fixing glue on the surface of the manhole frame and the new integrated sealing rubber ring, fixing the integrated sealing rubber ring on the manhole frame, and curing for 24 hours;
step C4, closing the manhole cover plate, screwing the fixing bolt, then performing a vacuum maintenance experiment on the seawater desalination device, closing the effective body vacuum breaking valve and all the sewage discharge doors, performing a vacuum-pumping experiment, and checking the sealing and leakage conditions of a new manhole door;
step C5, observing the change speed of the vacuum degree per hour in the seawater desalination device within 2 days after the manhole door integrated rubber sealing device is installed;
and step C6, when the seawater desalination device normally operates, the sealing and vacuum degree protection functions of the seawater desalination device effect body are realized through the manhole door integrated rubber sealing device.
The invention has the advantages that: the invention provides a device and a method for improving the vacuum degree of a low-temperature multi-effect seawater desalination device, and the device and the method have the following advantages:
1. the device has the advantages of simple structure, convenient operation, reliable operation and low cost, realizes the design optimization of the original vacuum leakage position of the low-temperature multi-effect seawater desalination device, and avoids the problem of the vacuum degree reduction of the device caused by long-time operation.
2. Aiming at and reasonably utilizing the vacuum leakage characteristics of a product water (strong brine) flash tank and a buffer tank of the low-temperature multi-effect seawater desalination device, a plurality of sewage pipes are arranged on a recovery pipe ditch in parallel, and the recovery pipe ditch is communicated with the sewage pipes, so that the balance connection of the sewage pipes with various effect devices can be ensured, and the heat utilization and water yield are improved.
3. The sewage discharge pipeline is straight and smooth, has strong corrosion resistance, and is not easy to have the faults of leakage, damage, water storage and the like.
4. According to the invention, the electric ball valve and the manual isolating door are arranged on the sewage discharge pipeline, so that the manual isolating door can be closed when the low-temperature multi-effect seawater desalination device is started, maintained in vacuum and in a standby state, and the possibility of vacuum leakage of the sewage discharge pipe of the flash tank is avoided.
5. The manhole door integrated rubber sealing device comprises a manhole frame, a manhole cover plate and an integrated sealing rubber ring, wherein the manhole cover plate is connected inside the manhole frame, and the integrated sealing rubber ring is adhered to the inner wall of the manhole frame.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic structural diagram of a flash tank blow-off pipe vacuum isolation device in the invention;
FIG. 2 is a schematic view of the installation structure of the primary steam flange metal seal system of the present invention;
FIG. 3 is a schematic front view of the manhole door integrated rubber sealing device according to the present invention;
FIG. 4 is a left side view schematic structural view of the manhole door integrated rubber sealing device of the present invention;
wherein:
1. a flash tank; 2. A blowdown line; 3. An electric ball valve;
4. a manual isolation door; 5. Recovering the pipe trench; 6. A main steam line;
7. a manhole door integrated rubber sealing device; 8. A main steam pipe flange; 9. A manhole frame;
10. a manhole cover plate; 11. An integral sealing rubber ring; 12. Fixing the bolt;
13. a door shaft; 14. A seawater desalination device.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that unless otherwise explicitly specified or limited, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance, and the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1:
fig. 1 is a schematic structural diagram of a flash tank blow-off pipe vacuum isolation device, fig. 2 is a schematic structural diagram of an installation structure of a main steam flange metal sealing system, fig. 3 is a schematic structural diagram of a main view of a manhole door integrated rubber sealing device, fig. 4 is a schematic structural diagram of a left view of the manhole door integrated rubber sealing device, fig. 1, fig. 2 and fig. 3 and fig. 4 show a device for improving the vacuum degree of a low-temperature multi-effect seawater desalination device, which comprises the flash tank blow-off pipe vacuum isolation device, the main steam flange metal sealing system and the manhole door integrated rubber sealing device, wherein the flash tank blow-off pipe vacuum isolation device and the integrated rubber sealing device are both installed inside a seawater desalination device 14, and the main steam flange metal sealing system is connected to the upper end of the seawater desalination device 14;
the vacuum isolation device for the blow-off pipe of the flash tank comprises the flash tank 1, the blow-off pipeline 2 and a recovery pipe ditch 5, wherein the flash tank 1 is arranged at the upper end of the blow-off pipeline 2, the flash tank 1 is communicated with the blow-off pipeline 2, an electric ball valve 3 and a manual isolation door 4 are arranged on the blow-off pipeline 2, the recovery pipe ditch 5 is arranged at the lower end of the blow-off pipeline 2, a plurality of blow-off pipelines 2 are arranged on the recovery pipe ditch 5 in parallel, and the recovery pipe ditch 5 is communicated with the blow-off pipe, the flash tank 1 in the invention refers to a product water (strong brine) flash tank 1 and a buffer tank of a low-temperature multi-effect seawater desalination device 14, the flash tank is important equipment for multi-stage flash evaporation of the low-temperature multi-effect seawater desalination device 14 and has the functions of balanced connection of various effect devices and improvement of heat utilization and water yield, a blow-off flange is arranged at the bottom of each flash tank 1 and communicated with the blow-off pipeline 2, about 5 meters from the ground;
when the low-temperature multi-effect seawater desalination device 14 is started, the electric ball valve 3 is closed; after the low-temperature multi-effect seawater desalination device 14 is shut down, the electric ball valve 3 is opened, and water stored in the pipeline is drained; vacuumizing and maintaining the low-temperature multi-effect seawater desalting device 14, and closing the electric ball valve 3 when the low-temperature multi-effect seawater desalting device is converted into a standby state; the original sewage discharge pipeline 2 is removed, the sewage discharge pipeline 2 is formed by welding and combining a 45-degree elbow and a DN50 stainless steel pipe, the new sewage discharge pipeline 2 is straight and smooth, the corrosion resistance is strong, and the faults of leakage, damage, water storage and the like are not easy to occur;
a manual butterfly valve (not shown in the figure) can be added at the bottom of the stainless steel sewage discharge pipe close to the position of the recovery pipe ditch 5 and is connected with the sewage discharge pipeline 2 through a flange. When the low-temperature multi-effect seawater desalination device 14 is started, maintained in vacuum and in a standby state, the manual isolation door 4 is closed, and the possibility of vacuum leakage of a drainage pipe of the flash tank 1 is avoided;
the recovery pipe ditch 5 is a pipe ditch which is positioned on the ground and is used for receiving drainage of a drainage pipe of the flash tank 1, and the pipe ditch is communicated with all rows of seawater desalination devices 14 and then is concentrated into a wastewater pool to participate in the next circulation;
the manhole door integrated rubber sealing device comprises a manhole frame 9, a manhole cover plate 10 and an integrated sealing rubber ring 11, wherein the manhole cover plate 10 is connected inside the manhole frame 9, the integrated sealing rubber ring 11 is bonded on the inner wall of the manhole frame 9, one side of the manhole cover plate 10 is connected with a door spindle 13, the manhole cover plate 10 is rotatably connected with the manhole frame 9 through the door spindle 13, the manhole frame 9 and the manhole cover plate 10 are mutually fixed through a plurality of fixing bolts 12, the fixing bolts 12 refer to 16 or 32 fixing bolts 12 around the manhole cover plate 10, the bolts are made of galvanized or stainless steel, plastic gaskets (not shown in the figure) can be added at the contact surface of the bolts and the manhole cover plate 10, and the fixing bolts 12 are fastened to seal the manhole door after an integrated sealing rubber strip is installed and the manhole cover plate is closed; the manhole frame 9 is arranged at 16 personal holes on a main body of a 1-14-effect evaporator and a falling film condenser in a low-temperature multi-effect seawater desalination device 14, the height of the manhole frame 9 is about 1.2 meters, the manhole frame is horizontally distributed at a platform of a device effect body, a metal plate plane frame is arranged around a manhole, and the manhole is made of carbon steel and used for being matched with a manhole cover plate 10 to realize sealing; the manhole cover plate 10 is a metal cover plate positioned on a manhole door, a door shaft 13 is arranged on the side surface of the manhole door cover plate to realize opening and closing, and 16 or 32 fixing bolts 12 are arranged along the periphery of a manhole frame 9 to realize a manhole closing function; integral type sealing rubber ring 11 indicates that will design original effect body manhole door open type rectangle rubber strip, changes to full-scale integral type sealing rubber ring, and its size is unanimous with the sealed face of manhole door, need not to tailor during the installation, overlap joint, bonding, has avoided leaking the problem in vacuum because of the sealed face of manhole door that rubber is ageing and personnel's installation misoperation leads to.
The main steam flange metal sealing system comprises a main steam pipeline 6 and main steam pipeline flanges 8, the main steam pipeline flanges 8 are connected to the lower end of the main steam pipeline 6, the main steam pipeline 6 is mutually connected with the seawater desalination device 14 through the main steam pipeline flanges 8, the diameter of the main steam pipeline 6 is 1200mm, the main steam pipeline 6 is made of carbon steel, and the effect that main steam enters the primary effect after passing through TVC can be achieved; the main steam pipeline flange 8 is made of carbon steel, the main steam pipeline flange 8 is used for connecting and supporting pipelines and conveying steam, and the number of the main steam pipeline flange is 10; the main steam pipeline flange 8 is a plurality of matched metal flanges on the main steam pipeline 6, and is made of carbon steel, and has the functions of pipeline connection, supporting, steam conveying and the like.
The invention also provides a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device, which comprises a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using a flash tank blow-off pipe vacuum isolation device, a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using a main steam flange metal sealing system and a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using a manhole-door integrated rubber sealing device 7, wherein the specific method principle comprises the following steps:
the method for improving the vacuum degree of the flash tank 1 blow-off pipe vacuum isolation system comprises the following steps:
and (3) mounting test: when the seawater desalination device 14 is stopped, the flash tank blow-off pipe vacuum isolation device is installed, then a vacuum pumping test is carried out on the flash tank blow-off pipe vacuum isolation device, and the sealing and leakage conditions of the flash tank blow-off pipe vacuum isolation device are checked. After the system is installed, observing the change speed of the vacuum degree in the flash tank blow-off pipe vacuum isolation device per hour within 2 days, wherein for the low-temperature multi-effect seawater desalination device 14 which is put into operation for about 10 years, the contribution degree of the flash tank blow-off pipe vacuum isolation device to the vacuum lifting of the seawater desalination device 14 is more than or equal to 5 mmhg/h;
the operation is as follows: when the seawater desalination device 14 is stopped, the electric control ball valves and the manual isolation doors 4 of the 26 branches are opened, and the water stored in the flash tank 1 is drained through the stainless steel drain pipe;
when the seawater desalination device 14 is subjected to vacuum maintenance after being shut down, the electric ball valves 3 and the manual isolation doors 4 of the 26 sewage discharge pipelines 2 are closed, so that the flash tank 1 is sealed, and the vacuum degree of the system is improved;
when the seawater desalination device 14 is started, the electric ball valves 3 of the 26 sewage pipes 2 are closed, and the manual isolation door 4 is opened, so that the operation and starting of remote control are facilitated for temporary drainage, the effect body vacuum is ensured, and the starting speed is increased;
the method for improving the vacuum degree of the main steam flange metal sealing system comprises the following steps:
when the seawater desalination device 14 is stopped, closing the air inlet electric door of the main steam pipeline 6, opening the effect body vacuum breaking valve, and then disassembling the polytetrafluoroethylene rubber sealing gasket of the main steam pipeline flange 8 and replacing the polytetrafluoroethylene rubber sealing gasket with a metal winding sealing gasket;
then, carrying out a vacuum maintenance experiment on the seawater desalting device 14, closing the effect body vacuum breaking valve and all the sewage discharge doors, carrying out a vacuum pumping experiment, and checking the sealing and leakage conditions of the newly-installed metal wound gasket;
after the main steam flange metal sealing system is installed, observing the change speed of the vacuum degree of the main steam flange metal sealing system per hour within 2 days, wherein for a low-temperature multi-effect seawater desalination device 14 which is put into operation for about 10 years, the contribution degree of the main steam flange metal sealing system to the vacuum lifting of the seawater desalination device 14 is more than or equal to 3 mmhg/h;
when the seawater desalination device 14 is started, an air inlet electric door of the main steam pipeline 6 is opened, the pressure-resistant condition of a metal sealing gasket of the flange 8 of the main steam pipeline is checked, whether steam leaks or not is checked, and the heat preservation of the main steam pipeline 6 and the flange 8 of the main steam pipeline is recovered after all tests are qualified;
when the seawater desalination device 14 normally operates, the metal sealing system of the main steam pipeline flange 8 realizes the sealing and vacuum degree protection functions of the TVC rear steam pipeline;
and when the operation of the seawater desalination device 14 is stable after starting, the manual isolation doors 4 of the 26 sewage pipes 2 are closed, and the vacuum degree of the system is improved.
The method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by the manhole door integrated rubber sealing device 7 comprises the following steps:
when the seawater desalination device 14 is stopped, closing an air inlet electric door of the main steam pipeline 6, opening an effect body vacuum breaking valve, detaching fixing bolts 12 of 16 manhole doors of an effect body and a falling film condenser of the seawater desalination device 14, and opening a manhole cover plate 10;
disassembling the original lap joint type sealing rubber strip, and cleaning the original sealant residue with ether to ensure that the surface of the manhole frame 9 is clean and flat;
coating fixing glue on the surface of the manhole frame 9 and the new integrated sealing rubber ring, fixing the integrated sealing rubber ring on the manhole frame 9, and curing for 24 hours;
and closing the manhole cover plate 10, screwing the fixing screw, performing a vacuum maintenance experiment on the seawater desalination device 14, closing the effect body vacuum destruction valve and all the sewage discharge doors, performing a vacuum pumping experiment, and checking the sealing and leakage conditions of the new manhole door. After the manhole door integrated rubber sealing device 7 is installed, the change speed of the vacuum degree of the seawater desalination device 14 per hour within 2 days is observed, and for the low-temperature multi-effect seawater desalination device 14 which is put into operation for about 10 years, the contribution degree of the manhole door integrated rubber sealing device to the vacuum lifting of the seawater desalination device 14 is more than or equal to 3 mmhg/h;
when the seawater desalination device 14 normally operates, the sealing and vacuum degree protection functions of the effect body device are realized through the manhole door integrated rubber sealing device 7.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (6)
1. A device for improving the vacuum degree of a low-temperature multi-effect seawater desalination device comprises a flash tank blow-off pipe vacuum isolation device, a main steam flange metal sealing system and a manhole door integrated rubber sealing device (7), wherein the flash tank blow-off pipe vacuum isolation device and the integrated rubber sealing device are both arranged inside the seawater desalination device (14), and the main steam flange metal sealing system is connected to the upper end of the seawater desalination device (14);
the method is characterized in that: the vacuum isolation device for the blow-off pipe of the flash tank comprises the flash tank (1), blow-off pipelines (2) and a recovery pipe ditch (5), wherein the flash tank (1) is arranged at the upper end of the blow-off pipeline (2), the flash tank (1) is communicated with the blow-off pipeline (2), an electric ball valve (3) and a manual isolation door (4) are installed on the blow-off pipeline (2), the recovery pipe ditch (5) is arranged at the lower end of the blow-off pipeline (2), a plurality of blow-off pipelines (2) are arranged on the recovery pipe ditch (5) in parallel, and the recovery pipe ditch (5) is communicated with the blow-off pipe;
the manhole door integrated rubber sealing device (7) comprises a manhole frame (9), a manhole cover plate (10) and an integrated sealing rubber ring (11), wherein the manhole cover plate (10) is connected inside the manhole frame (9), and the integrated sealing rubber ring (11) is bonded on the inner wall of the manhole frame (9);
the main steam flange metal sealing system comprises a main steam pipeline (6) and main steam pipeline flanges (8), wherein the main steam pipeline flanges (8) are connected to the lower end of the main steam pipeline (6), and the main steam pipeline (6) is connected with the seawater desalination device (14) through the main steam pipeline flanges (8).
2. The device for improving the vacuum degree of the low-temperature multi-effect seawater desalination device as claimed in claim 1, is characterized in that: one side of manhole cover plate (10) is connected with door-hinge (13), and manhole cover plate (10) is connected through rotation each other between door-hinge (13) and manhole frame (9).
3. The device for improving the vacuum degree of the low-temperature multi-effect seawater desalination device as claimed in claim 1, is characterized in that: the main steam pipeline flange (8) is made of carbon steel, and the main steam pipeline (6) flange is used for connecting and supporting pipelines and conveying steam.
4. The device for improving the vacuum degree of the low-temperature multi-effect seawater desalination device as claimed in claim 1, is characterized in that: the diameter of the main steam pipeline (6) is 1200mm, and the main steam pipeline (6) is made of carbon steel.
5. The device for improving the vacuum degree of the low-temperature multi-effect seawater desalination device as claimed in claim 1, is characterized in that: the manhole frame (9) and the manhole cover plate (10) are fixed with each other through a plurality of fixing bolts (12).
6. The method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device comprises a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using a flash tank blow-off pipe vacuum isolation device, a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using a main steam flange metal sealing system and a method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using a manhole door integrated rubber sealing device, wherein the method comprises the steps of;
the method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by using the flash tank blow-off pipe vacuum isolation device is characterized by comprising the following steps of:
step A1, an installation test, namely installing the flash tank blow-off pipe vacuum isolation device when the seawater desalination device (14) is stopped, then carrying out a vacuum test on the vacuum isolation device, and checking the sealing and leakage conditions of the flash tank blow-off pipe vacuum isolation device;
step A2, observing the hourly change speed of the vacuum degree in the seawater desalination device (14) within 2 days after the vacuum isolation device of the flash tank blow-off pipe is installed;
step A3 operation: when the seawater desalination device (14) is stopped, an electric ball valve (3) and a manual isolation door (4) on a sewage discharge pipeline (2) are opened, and water stored in the flash tank (1) is discharged through the sewage discharge pipeline (2);
step A4, when the seawater desalination device (14) is stopped and is subjected to vacuum maintenance, closing the electric ball valve (3) and the manual isolation door (4) of the sewage discharge pipeline (2), realizing the sealing of the flash tank (1) and improving the vacuum degree of the system;
step A5, when the seawater desalination device (14) is started, closing the electric ball valve (3) of the sewage pipeline (2), and opening the manual isolation door (4), so that the operation and the starting of remote control are facilitated to temporarily drain water, the vacuum of the effect body is ensured, and the starting speed is increased;
a6, when the operation of the equipment is stable after the equipment is started, closing the manual isolating door (4) of the sewage pipeline (2);
the method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by the main steam flange metal sealing system comprises the following steps:
step B1, when the seawater desalination device (14) is stopped, closing the air inlet electric door of the main steam pipeline (6), opening the effect body vacuum breaking valve, and then disassembling the polytetrafluoroethylene rubber sealing gasket of the main steam pipeline flange (8) and replacing the polytetrafluoroethylene rubber sealing gasket with a metal winding sealing gasket;
step B2, performing a vacuum maintenance experiment on the seawater desalination device (14), closing the effect body vacuum destruction valve and all the sewage discharge doors, performing a vacuum-pumping experiment, and checking the sealing and leakage conditions of the newly-installed metal wound gasket;
step B3, observing the change speed of the vacuum degree of the seawater desalination device (14) per hour within 2 days after the main steam flange metal sealing system is installed;
step B4, when the seawater desalination device (14) is started, an air inlet electric door of the main steam pipeline (6) is opened, the pressure-resistant condition of a metal sealing gasket of the main steam pipeline flange (8) is checked, whether steam leaks or not is checked, and the heat preservation of the main steam pipeline (6) and the main steam pipeline flange (8) is recovered after all tests are checked to be qualified;
step B5, when the seawater desalination device (14) operates normally, the metal sealing system of the main steam pipeline flange (8) realizes the sealing and vacuum degree protection functions of the TVC rear steam pipeline;
the method for improving the vacuum degree of the low-temperature multi-effect seawater desalination device by the manhole door integrated rubber sealing device (7) comprises the following steps:
step C1, when the seawater desalination device (14) is stopped, closing an air inlet electric door of the main steam pipeline (6), opening an effect body vacuum breaking valve, disassembling a fixing bolt (12) of a manhole door, and opening a manhole cover plate (10);
step C2, disassembling the original lap joint type sealing rubber strip, and cleaning the original sealant residue with ether to ensure that the surface of the manhole frame (9) is clean and flat;
c3, smearing fixing glue on the surface of the manhole frame (9) and the new integrated sealing rubber ring, fixing the integrated sealing rubber ring on the manhole frame (9), and curing for 24 hours;
step C4, closing the manhole cover plate (10), screwing the fixing bolt (12), then performing a vacuum maintenance experiment on the seawater desalination device (14), closing the effect body vacuum breaking valve and all the sewage discharge doors, performing a vacuum-pumping experiment, and checking the sealing and leakage conditions of a new manhole door;
step C5, after the manhole door integrated rubber sealing device (7) is installed, observing the change speed of the vacuum degree per hour in the seawater desalination device (14) within 2 days;
and step C6, when the seawater desalination device (14) normally operates, the sealing and vacuum degree protection functions of the seawater desalination device (14) effect body are realized through the manhole door integrated rubber sealing device (7).
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Inventor after: Song Huihui Inventor after: Gong Xiaoyong Inventor after: Li Chenglei Inventor after: Yin Qinglu Inventor after: Li Xiaoyu Inventor after: Yang Dejiu Inventor after: Ma Xuri Inventor before: Li Chenglei Inventor before: Gong Xiaoyong Inventor before: Yin Qinglu Inventor before: Li Xiaoyu Inventor before: Yang Dejiu Inventor before: Ma Xuri |