CN113023806A - Hot method seawater desalination oxygen corrosion detection device and detection method thereof - Google Patents
Hot method seawater desalination oxygen corrosion detection device and detection method thereof Download PDFInfo
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- CN113023806A CN113023806A CN202110257394.9A CN202110257394A CN113023806A CN 113023806 A CN113023806 A CN 113023806A CN 202110257394 A CN202110257394 A CN 202110257394A CN 113023806 A CN113023806 A CN 113023806A
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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
- C02F1/043—Details
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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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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
- C02F2209/22—O2
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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
- C02F2303/00—Specific treatment goals
- C02F2303/08—Corrosion inhibition
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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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- Heat Treatment Of Water, Waste Water Or Sewage (AREA)
Abstract
The invention belongs to the technical field of chemical water treatment, and provides a thermal method seawater desalination oxygen corrosion detection device and a detection method thereof.
Description
Technical Field
The invention relates to the technical field of chemical water treatment, in particular to a device and a method for detecting oxygen corrosion of seawater desalination by a thermal method.
Background
At present, because the raw material water adopted in the hot method seawater desalination technology is seawater, the equipment operation temperature is generally considered to be low, the low-temperature multi-effect seawater desalination operation temperature is not more than 70 ℃, the multistage flash evaporation seawater desalination temperature is not more than 110 ℃, the material contacting seawater is generally selected from corrosion-resistant materials, such as a shell body which adopts two-phase steel and carbon steel lining anticorrosive paint, a heat exchange tube bundle which adopts corrosion-resistant copper tubes, stainless steel tubes, aluminum-magnesium alloy tubes and the like, other accessories which adopt corrosion-resistant materials, design and the like, the equipment operates under negative pressure, and part of insoluble gases such as oxygen and the like are discharged through a vacuum air extractor and the like, the corrosion is not obvious theoretically, and the necessary oxygen corrosion detection means is not considered to.
However, in the conventional inspection of the equipment for multistage flash evaporation seawater desalination or low-temperature multi-effect seawater desalination after being shut down, the corrosion phenomenon of the equipment is common, and the corrosion is mainly caused by that dissolved oxygen carried in seawater and electrochemical reaction is carried out on the dissolved oxygen and exposed metal contacted with the dissolved oxygen under the conditions of chloride ions in the seawater and a certain temperature.
In general, in the operation of a thermal method seawater desalination device, dissolved oxygen entering the device mainly comes from three aspects, namely, firstly, feeding seawater is exposed in an atmospheric environment, free oxygen in the atmosphere can be dissolved into the seawater to form dynamic balance, so that a certain amount of dissolved oxygen is dissolved into the seawater, secondly, in order to control the growth of microorganisms, a proper excess oxidant (biocide) is added into the feeding seawater, the oxidant is decomposed and releases the free oxygen, thirdly, the seawater desalination device operates under negative pressure, and the atmosphere can leak into the seawater desalination device through an imprecise interface such as an equipment effect body, a pipeline, a valve and accessories, so that the oxygen content in the device, namely the oxygen content leaked in the device is increased. In the above three aspects, the amount of oxygen leaked in is usually a constant value, and is subtracted in the analysis of oxygen amount.
The oxygen carried out from the low-temperature multi-effect seawater desalination device is mainly gaseous oxygen in non-condensable gas extracted from a system for maintaining equipment vacuum, dissolved oxygen in other desalted water and concentrated brine is fully released or participates in corrosion, and the dissolved oxygen is close to zero, so that oxygen which is not discharged along with the non-condensable gas is oxygen corrosion of residual dissolved oxygen in the process of producing water.
The problem that the service life of the device is shortened and the cost is increased due to the fact that the oxygen corrosion degree in the seawater desalination device is difficult to detect, the device cannot be detected when oxygen corrosion occurs, and cannot be maintained in time, the oxygen amount is reduced, and the oxygen corrosion is avoided or reduced in the prior art.
Disclosure of Invention
In order to solve the technical problems that the oxygen corrosion degree in a seawater desalination device is difficult to detect, the device cannot detect when oxygen corrosion occurs, the device cannot be maintained in time, the oxygen content is reduced, and the reduction of the service life of the device and the increase of the cost caused by the oxygen corrosion is avoided or alleviated, the invention provides a hot seawater desalination oxygen corrosion detection device and a detection method thereof.
A hot method seawater desalination oxygen corrosion detection device comprises: sea water desalination device body, pan feeding sea water pipe, desalination water pipe, heating steam pipe, strong brine delivery pipe and non-crystallization gas extraction pipe communicate with sea water desalination device body respectively, be provided with pan feeding sea water oxygen content detector on the pan feeding sea water pipe, be provided with desalination water oxygen content detector on the desalination water pipe, be provided with strong brine oxygen content detector on the strong brine delivery pipe, be provided with non-condensation gas oxygen content detector on the non-crystallization gas extraction pipe, pan feeding sea water oxygen content detector, desalination water oxygen content detector, strong brine oxygen content detector and non-condensation gas oxygen content detector all establish the communication with the analysis appearance.
Further, a steam ejector is arranged at the outlet end of the non-crystallization gas extraction pipe.
Further, a desalination water pump is arranged on the desalination water pipe.
Further, a strong brine pump is arranged on the strong brine discharge pipe.
Furthermore, the pan feeding sea water oxygen content detector, the desalted water oxygen content detector, the strong brine oxygen content detector and the noncondensable gas oxygen content detector are all communicated with the analyzer in a wired or wireless mode.
Further, the heating steam pipe and the feeding seawater pipe are positioned at the same side of the seawater desalination device body, and the heating steam pipe is positioned above the feeding seawater pipe.
Further, desalination water pipe and strong brine delivery pipe are located the sea water desalination device body and heat the opposite one side of steam pipe and pan feeding sea water pipe to the desalination water pipe is located strong brine delivery pipe top.
Further, the non-crystallized gas extraction pipe is positioned above the seawater desalination device body and close to the desalination water pipe and the strong brine discharge pipe.
A detection method of a hot method seawater desalination oxygen corrosion detection device comprises the following specific steps:
s1: sea water is injected into the sea water desalting plant body from a feeding sea water pipe, the oxygen content in the initial sea water is detected by a feeding sea water oxygen content detector positioned on the feeding sea water pipe, and data are sent to an analyzer.
S2: the sea water is handled at sea water desalination device body, then the desalination water is discharged from the desalination water pipe, detect the oxygen content in the desalination water and give the analysis appearance with the desalination water oxygen content detector that is located on the desalination water pipe, the strong brine is discharged from strong brine discharge pipe, detect the oxygen content in the strong brine with the strong brine oxygen content detector that is located on the strong brine discharge pipe and give the analysis appearance with data transmission, the gaseous oxygen content that does not pass through the gaseous extraction pipe of non-crystallization from steam jet ware discharge, detect the gaseous oxygen content of non-crystallization with the gaseous oxygen content detector of non-condensation that is located on the gaseous extraction pipe of non-crystallization and give the analysis appearance with data transmission.
S3: the received oxygen amount data is stored and processed by the analyzer to generate an analysis result, and dissolved oxygen in the chemical agent consumption system is added according to the analysis result, or the operation condition of the steam jet device is improved, so that the oxygen content of the exhaust system is improved.
The invention has the beneficial effects that:
the invention provides a hot method seawater desalination oxygen corrosion detection device and a detection method thereof, which can real-timely and cumulatively detect the consumption condition of oxygen quantity, judge the oxygen corrosion condition of metal on the inner surface of equipment, further increase the oxygen content of a discharge system by adding dissolved oxygen in a chemical agent consumption system or improving the operation condition of a steam jet device, and have the effects of detecting the oxygen quantity in a seawater desalination device, judging the oxygen corrosion degree by processing and analyzing oxygen quantity data, taking oxygen consumption measures according to the analysis result, effectively prolonging the operation life of the equipment and reducing the use cost of the equipment.
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 view of the present invention;
wherein:
the seawater desalination device comprises a seawater desalination device body-1, a seawater feeding pipe-2, a desalination water pipe-6, a heating steam pipe-7, a concentrated brine discharge pipe-8, a non-crystallized gas extraction pipe-9, a seawater feeding oxygen amount detector-11, a desalinated water oxygen amount detector-12, a concentrated brine oxygen amount detector-13, a non-condensed gas oxygen amount detector-14, an analyzer-15, a steam jet device-10, a desalination water pump-4 and a concentrated brine pump-5.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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.
It should be noted that the installation methods and technical terms mentioned in the present invention are technical terms that are already clearly known in the technical field, and thus, the explanation thereof is not repeated. Moreover, the same reference numerals are used for the same components, which do not affect and should not constitute an exact understanding of the technical solutions for a person skilled in the art.
The first embodiment is as follows:
the invention relates to a hot method seawater desalination oxygen corrosion detection device, which comprises: the seawater desalination device comprises a seawater desalination device body 1, a feeding seawater pipe 2, a desalination water pipe 6, a heating steam pipe 7, a strong brine discharge pipe 8 and an uncrystallized gas extraction pipe 9, wherein the feeding seawater pipe 2, the desalination water pipe 6, the heating steam pipe 7, the strong brine discharge pipe 8 and the uncrystallized gas extraction pipe 9 are respectively communicated with the seawater desalination device body 1, the feeding seawater pipe 2 is provided with a feeding seawater oxygen content detector 11, the desalination water pipe 6 is provided with a desalinated water oxygen content detector 12, the strong brine discharge pipe 8 is provided with a strong brine oxygen content detector 13, the uncrystallized gas extraction pipe 9 is provided with a noncondensable gas oxygen content detector 14, the feeding seawater oxygen content detector 11, the desalination water desalinated oxygen content detector 12, the strong brine oxygen content detector 13 and the noncondensable gas oxygen content detector 14 are all communicated with an analyzer 15, and the problem that the oxygen corrosion degree in the seawater desalination device, unable detection when the device takes place the oxygen corrosion, can not in time maintain, reduce oxygen content, avoid or alleviate the oxygen corrosion, lead to device life to reduce, the technical problem of cost increase, through at pan feeding sea water pipe 2, desalination water pipe 6, set up the oxygen content detector on strong brine discharge pipe 8 and the uncrystallized gas extraction pipe 9 respectively, gather the oxygen content of each entry and export in real time and give the analysis appearance 15 with oxygen content data transmission and carry out the analysis, add the dissolved oxygen in the chemical agent consumption system through the analysis result, thereby perhaps improve steam jet's operating condition and improve discharge system's oxygen content, make the detection oxygen content, oxygen corrosion degree is simple and fast among the judgement device, in time take the oxygen consumption measure, reduce oxygen content, avoid or alleviate the oxygen corrosion, equipment life has been improved effectively.
The outlet end of the non-crystallization gas extraction pipe 9 is provided with a steam ejector 10.
The desalination water pump 4 is arranged on the desalination water pipe 6, so that the power of the desalination water is sufficient, and the operation efficiency of the desalination water device is improved.
Be provided with strong brine pump 5 on the strong brine discharge pipe 8, so set up to make strong brine power sufficient, make the desalination device operating efficiency improve.
Pan feeding sea water oxygen volume detector 11, desalination water oxygen volume detector 12, strong brine oxygen volume detector 13 and noncondensable gas oxygen volume detector 14 all establish the communication with analyzer 15 and be wired or wireless mode, according to different scenes, set up pan feeding sea water oxygen volume detector 11, desalination water oxygen volume detector 12, strong brine oxygen volume detector 13 and noncondensable gas oxygen volume detector 14 all with analyzer 15's communication mode into wired or wireless mode, have enlarged the application range of device.
The heating steam pipe 7 and the feeding seawater pipe 2 are positioned on the same side of the seawater desalination device body 1, and the heating steam pipe 7 is positioned above the feeding seawater pipe 2.
Desalination water pipe 6 and strong brine discharge pipe 8 are located the sea water desalination device body 1 and heat steam pipe 7 and the relative one side of pan feeding sea water pipe 2 to desalination water pipe 6 is located strong brine discharge pipe 8 top.
The non-crystallized gas extraction pipe 9 is positioned above the seawater desalination device body 1 and close to the positions of the desalination water pipe 6 and the strong brine discharge pipe 8, and the non-crystallized gas is smoothly discharged out of the desalination water device.
The invention relates to a detection method of a hot method seawater desalination oxygen corrosion detection device, which comprises the following specific steps:
s1: sea water is injected into the sea water desalination device body 1 from the feeding seawater pipe 2, the oxygen content in the initial sea water is detected by the feeding seawater oxygen content detector 11 positioned on the feeding seawater pipe 2, and data are sent to the analyzer 15.
S2: the sea water is handled at sea water desalination device body 1, then the desalination is discharged from desalination water pipe 6, detect the oxygen content in the desalination with desalination water oxygen content detector 12 that is located desalination water pipe 6 and give analyzer 15 with data transmission, the strong brine is discharged from strong brine discharge pipe 8, detect the oxygen content in the strong brine and give analyzer 15 with strong brine oxygen content detector 13 that is located strong brine discharge pipe 8, the gas that does not crystallize is discharged from steam jet 10 through non-crystallization gas extraction pipe 9, detect the oxygen content in the non-crystallization gas and give analyzer 15 with non-condensation gas oxygen content detector 14 that is located non-crystallization gas extraction pipe 9.
S3: the received oxygen amount data is stored, processed and generated by the analyzer 15, and the dissolved oxygen in the chemical agent consumption system is added according to the analysis result, or the operation condition of the steam jet device is improved, so that the oxygen content of the exhaust system is increased.
The working principle is as follows:
sea water is injected into the sea water desalination device body 1 from the feeding sea water pipe 2, and the feeding sea water oxygen amount detector 11 positioned on the feeding sea water pipe 2 detects the oxygen amount in the initial sea water and sends data to the analyzer 15; sea water is treated in a sea water desalination device body 1, then desalinated water is discharged from a desalinated water pipe 6, an oxygen content detector 12 located on the desalinated water pipe 6 detects oxygen content in the desalinated water and sends data to an analyzer 15, strong brine is discharged from a strong brine discharge pipe 8, a strong brine oxygen content detector 13 located on the strong brine discharge pipe 8 detects oxygen content in the strong brine and sends data to the analyzer 15, non-crystallized gas is discharged from a steam injector 10 through a non-crystallized gas extraction pipe 9, and a non-condensed gas oxygen content detector 14 located on the non-crystallized gas extraction pipe 9 detects oxygen content in the non-crystallized gas and sends data to the analyzer 15; the analyzer 15 stores and processes the received oxygen amount data to generate an analysis result, and adds dissolved oxygen in the chemical agent consumption system according to the analysis result, or improves the operation condition of the steam jet device to increase the oxygen content of the exhaust system. The essence of the method is that the total amount of dissolved oxygen entering the seawater desalination equipment and the variable amount of dissolved oxygen leaving the seawater desalination equipment are monitored according to material balance, so that the situation of oxygen corrosion is judged, oxygen consumption measures are taken according to the situation of oxygen corrosion to reduce the oxygen corrosion, and the service life of the equipment is prolonged.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and any minor modifications, equivalent replacements and improvements made to the above embodiment according to the technical spirit of the present invention should be included in the protection scope of the technical solution of the present invention.
Claims (9)
1. A hot method seawater desalination oxygen corrosion detection device comprises: the seawater desalination device is characterized in that the seawater desalination device body (1), the feeding seawater pipe (2), the desalination water pipe (6), the heating steam pipe (7), the strong brine discharge pipe (8) and the non-crystallization gas extraction pipe (9) are respectively communicated with the seawater desalination device body (1), the feeding seawater pipe (2), the desalination water pipe (6), the heating steam pipe (7), the strong brine discharge pipe (8) and the non-crystallization gas extraction pipe (9), a feeding seawater oxygen amount detector (11) is arranged on the feeding seawater pipe (2), a desalination water oxygen amount detector (12) is arranged on the desalination water pipe (6), a strong brine oxygen amount detector (13) is arranged on the strong brine discharge pipe (8), a non-condensation gas oxygen amount detector (14) is arranged on the non-crystallization gas extraction pipe (9), the feeding seawater oxygen amount detector (11), the desalination water oxygen amount detector (12), The concentrated brine oxygen content detector (13) and the non-condensable gas oxygen content detector (14) are communicated with the analyzer (15).
2. The device for detecting oxygen corrosion by hot seawater desalination according to claim 1, wherein the outlet end of the non-crystallizing gas extraction pipe (9) is provided with a steam jet device (10).
3. The device for detecting oxygen corrosion by seawater desalination by thermal method according to claim 1, wherein the desalinated water pipe (6) is provided with a desalinated water pump (4).
4. The device for detecting oxygen corrosion by hot seawater desalination according to claim 1, wherein the strong brine discharge pipe (8) is provided with a strong brine pump (5).
5. The device for detecting oxygen corrosion by seawater desalination by a thermal method according to claim 1, wherein the fed seawater oxygen content detector (11), the desalinated water oxygen content detector (12), the concentrated brine oxygen content detector (13) and the non-condensable gas oxygen content detector (14) are all in wired or wireless communication with the analyzer (15).
6. The device for detecting oxygen corrosion by seawater desalination by thermal method according to claim 1, wherein the heating steam pipe (7) and the feeding seawater pipe (2) are located on the same side of the seawater desalination device body (1), and the heating steam pipe (7) is located above the feeding seawater pipe (2).
7. The device for detecting oxygen corrosion by seawater desalination by thermal method according to claim 1, wherein the desalinated water pipe (6) and the concentrated brine discharge pipe (8) are positioned on the side of the seawater desalination device body (1) opposite to the heating steam pipe (7) and the feeding seawater pipe (2), and the desalinated water pipe (6) is positioned above the concentrated brine discharge pipe (8).
8. The device for detecting oxygen corrosion by hot seawater desalination according to claim 1, wherein the non-crystallized gas extraction pipe (9) is positioned above the seawater desalination device body (1) and close to the desalination water pipe (6) and the concentrated brine discharge pipe (8).
9. A detection method of a hot method seawater desalination oxygen corrosion detection device is characterized by comprising the following specific steps:
s1: sea water is injected into the sea water desalination device body (1) from the feeding sea water pipe (2), the feeding sea water oxygen content detector (11) positioned on the feeding sea water pipe (2) is used for detecting the oxygen content in the initial sea water and sending data to the analyzer (15).
S2: sea water is handled in sea water desalination device body (1), then the desalination is discharged from desalination pipe (6), detect the oxygen content in the desalination with desalination oxygen content detector (12) that is located desalination pipe (6) and send data for analysis appearance (15), the strong brine is discharged from strong brine discharge pipe (8), detect the oxygen content in the strong brine and send data for analysis appearance (15) with strong brine oxygen content detector (13) that is located strong brine discharge pipe (8), the gaseous oxygen content of non-crystallization through non-crystallization gas extraction pipe (9) from steam jet ware (10), detect the oxygen content in the non-crystallization gas and send data for analysis appearance (15) with non-condensable gas oxygen content detector (14) that is located non-crystallization gas extraction pipe (9).
S3: the received oxygen data is stored and processed by the analyzer (15) to generate an analysis result, and dissolved oxygen in the chemical agent consumption system is added according to the analysis result, or the operation condition of the steam jet device is improved, so that the oxygen content of the exhaust system is increased.
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| CN215249670U (en) * | 2021-03-09 | 2021-12-21 | 天津国投津能发电有限公司 | Oxygen corrosion detection device for seawater desalination by thermal method |
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2021
- 2021-03-09 CN CN202110257394.9A patent/CN113023806A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2363756A1 (en) * | 1973-12-21 | 1975-06-26 | Friedrichsfeld Gmbh | Measurement of oxygen dissolved in water - is applied to plant with high corrosion risk and uses electrolytic detector |
| JP2006029759A (en) * | 2004-06-14 | 2006-02-02 | Mitsubishi Heavy Ind Ltd | Steam treatment method of boiler plant and boiler plant |
| CN102997215A (en) * | 2012-06-14 | 2013-03-27 | 深圳市广前电力有限公司 | Quick start method and system of combined cycle unit |
| CN103030185A (en) * | 2012-12-19 | 2013-04-10 | 中国电子工程设计院 | Low-temperature multi-effect sea water desalinization system |
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