CN109847549A - A kind of technique that ocean platform efficiently utilizes seawater - Google Patents
A kind of technique that ocean platform efficiently utilizes seawater Download PDFInfo
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- CN109847549A CN109847549A CN201811629656.4A CN201811629656A CN109847549A CN 109847549 A CN109847549 A CN 109847549A CN 201811629656 A CN201811629656 A CN 201811629656A CN 109847549 A CN109847549 A CN 109847549A
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Abstract
The application discloses the technique that a kind of ocean platform efficiently utilizes seawater, and the technique includes: by seawater lift, pretreatment, filtering, pressurization；The seawater of acquisition is carried out to obtain fresh water and concentrated seawater except hard desalination；Fresh water is subjected to deoxygenation；Concentrated seawater is subjected to energy regenerating, then carries out desulfurization and dedusting together with flue gas, by the flue gas emission after desulfurization and dedusting；Concentrated seawater after fresh water and desulfurization and dedusting after deoxygenation is subjected to heat exchange；By the fresh water vaporization after heat exchange, steam is generated, the steam injects stratum；By the concentrated seawater processing after heat exchange, discharge.The system that the ocean platform efficiently utilizes seawater technique is also disclosed in the application, the system comprises pretreatment unit, energy recycle device, removes hard demineralizer, deaerating plant, heat-exchange device, steam generation facility, desulfation dust-extraction device.The application is in terms of sea water desalination, energy saving 35%-40%；Steam is not consumed when deoxygenation；Desulfurization is carried out using concentrated seawater, reduces energy consumption, it is at low cost.
Description
Technical field
The present invention relates to a kind of systems for efficiently utilizing seawater, and in particular to a kind of ocean platform fuel oil boiler high-efficiency utilization
The technique of seawater.
Background technique
Offshore platform shortage of fresh water, fresh water used are all to be transported to offshore platform, water consumption from land by ship
It will receive considerable restraint, and only Drinking Water is the fresh water from land transport, the industrial water on platform all uses light
Change treated seawater.It desalinizes seawater after being utilized, remaining high pressure concentrated seawater directly exhausts, and energy loss is caused, so that extra large
Water desalination maintains high price.
The utilization rate of seawater is improved therefore, it is necessary to a kind of ocean platform fuel oil boiler high-efficiency seawater utilization technique.
Summary of the invention
It is the general introduction to the theme being described in detail herein below.This general introduction is not the protection model in order to limit claim
It encloses.
In recent years, gradually at sea application is carried out in oil field to heavy crude heat extraction technology, and steam injection recovery has become Offshore Heavy Oil Field
One Main way of oil thermal recovery test.Oil burning boiler is the capital equipment for generating steam, is had sternly to the water quality indicator for entering water
Lattice requirement, water quality, which must reach relevant criterion, just can enter equipment, you must use water treatment facilities and desalinates seawater
It just supplies water to oil burning boiler after processing.Currently, sea water desalination common technology --- reverse osmosis desalination technology desalinizes seawater and is utilized
Afterwards, remaining high pressure concentrated seawater directly exhausts, and causes energy loss, so that sea water desalination maintains high price.Fresh water enters combustion
Deoxygenation is needed before thermo oil boiler, deaeration in condenser and thermal de-aeration occupation area of equipment are big in deoxygenation technology, and thermal de-aeration consumption is steamed
Vapour, and embrane method deaeration plant is highly integrated, occupied area reduces by 80~90% compared with the above two, and treatment process does not consume steam.
The flue gas that oil burning boiler generates is directly discharged in atmosphere, can cause centainly to pollute to marine atmosphere, special
It is not that can generate greenhouse effects and sour gas (SO2And NOx) pollution, so flue gas is discharged after having to pass through processing.Seawater method
Sulfur removal technology is simple, fresh-water-saving resource, operating cost are low, and product sulfate is inherently present in natural sea-water and is main
It is little to be discharged into influence of the sea to environment under the premise of flue gas sulfur content is not high outside for one of component.Simultaneously and after flue gas heat exchange
Concentrated seawater temperature increase, using its heat, the fresh water that concentrated seawater and oil burning boiler need is exchanged heat, oil burning boiler energy is reduced
Consumption.Seawater not only can remove the SO in flue gas2、SO3Equal sulfur-containing oxides, moreover it is possible to dedusting, while seawater passes through flue qi exhaustion
Temperature increases after sulphur dedusting process, can exchange heat with fresh water used in oil burning boiler, reduce the fuel consumption of oil burning boiler.Benefit at present
The method that flue gas is carried out desulfurization process with the concentrated seawater after sea water desalination, there are no relevant reports at home.
The object of the present invention is to provide the technique that a kind of ocean platform fuel oil boiler high-efficiency utilizes seawater, desalting process
Middle to reduce energy consumption using energy recycle device, reduce device area using film Deoxidization method, the seawater after desalination is as fuel oil pot
Furnace water, concentrated seawater are used for flue gas desulfurization dedusting.
Specifically, the present invention provides the technique that a kind of ocean platform fuel oil boiler high-efficiency utilizes seawater, and the technique includes:
(1) by seawater lift, pretreatment, filtering, pressurization；
(2) seawater obtained in step (1) is carried out obtaining fresh water and concentrated seawater except hard desalination；
(3) fresh water is subjected to deoxygenation；
(4) concentrated seawater is subjected to energy regenerating, then desulfurization and dedusting is carried out together with flue gas, after desulfurization and dedusting
Flue gas emission；
(5) concentrated seawater after the fresh water and step (4) desulfurization and dedusting after step (3) deoxygenation is subjected to heat exchange；
(6) fresh water after step (5) heat exchange is vaporized, generates steam, the steam injects stratum；
(7) concentrated seawater after step (5) heat exchange is handled, discharge.
In this application, in step (1), chemical agent is added, seawater is pre-processed, the chemical agent is selected from
Any one of flocculant, fungicide, antisludging agent, reducing agent or more.
In this application, the flocculant can be any one of Ferric Salt Flocculants or aluminum salt flocculant or more
Kind, such as polyaluminium chloride (Poly aluminum Chloride, PAC) flocculant.
In this application, the fungicide can be oxidizing bactericide, such as sodium hypochlorite fungicide.
In this application, the antisludging agent can be phosphate type antisludging agent, organic phosphonate antisludging agent, such as tricresyl phosphate
Sodium, sodium tripolyphosphate, calgon；Hydroxy ethylene diphosphonic acid (1-Hydroxy Ethylidene-1,1-
Diphosphonic Aci, HEDP), aminotrimethylenephosphonic acid (Nitrilotrimethylene Triphosphonic
Acid, ATMP), ethylenediamine tetramethylene phosphonic acid (Ethylenediamine Tetramethylenephosphonic acid,
EDTMPA)。
In this application, the reducing agent can selected from any one of sodium hydrogensulfite, ferrous sulfate, frerrous chloride or
It is more kinds of.
In this application, in step (1), seawater is filtered using high efficiency filter, the high efficiency filter can be
High-efficiency fiber filtering, the suspended matter that can be effectively removed in water, and have to organic matter, colloid, iron, the manganese etc. in water and significantly go
Except effect, especially tiny flocculated suspension object has fabulous interception function.
In this application, in step (3), 50 μ g/L of water oxygen level < after deoxygenation.
In this application, in step (3), water oxygen level can be 1 μ g/L-7 μ g/L after deoxygenation.
In this application, in step (4), concentrated seawater be used for desulfurization and dedusting, concentrated seawater be used as medium, investment cost lack at
This is low, and fresh-water-saving resource, desulfurization dust-removing efficiency 90%-95%, and flue gas is up to standard to meet that " GB13271-2014- boiler is big
Gas pollutant emission standard " it discharges afterwards.
1 GB13271-2014- emission standard of air pollutants for boilers of table
In this application, in step (5), after heat exchange, concentrated seawater temperature is increased to 35 DEG C -40 DEG C.
In this application, in step (5), after concentrated seawater and flue gas heat exchange, flue-gas temperature is reduced, concentrated seawater temperature liter
Height, into heat-exchanger rig, fresh water before heated fuel oil boiler inlet reduces oil burning boiler energy consumption.Concentrated seawater after cooling enters
Processing unit, processing heel row sea.
In this application, in step (6), after fresh water and concentrated seawater heat exchange, into oil burning boiler, it is heated generation steaming
Vapour, steam inject underground through offshore platform well head and pit shaft, by reducing thick oil viscosity, improve heavy oil production.
The application also provides the system for utilizing seawater technique for carrying out ocean platform fuel oil boiler high-efficiency, the system packet
Include pretreatment unit, energy recycle device, except hard demineralizer, deaerating plant, heat-exchange device, steam generation facility, desulfurization
Dust-extraction unit.
In this application, the system is mainly by pretreatment unit, energy recycle device, except hard demineralizer, deoxygenation dress
It sets, heat-exchange device, steam generation facility, desulfation dust-extraction device composition.
In this application, by energy recycle device, the energy of concentrated seawater, capacity usage ratio 35%-40% are recycled.
In this application, described except hard dust-extraction unit includes reverse osmosis membrane and continuous electric desalination
(Electrodeionization, EDI) equipment, the reverse osmosis membrane and the continuous electric desalination equipment are sequentially connected, removal sea
Metal ion and salinity in water.Reverse osmosis membrane be mainly used to remove most of soluble salt point in water, colloid, organic matter and
Microorganism.EDI is used for the deep purifying desalination of water.
Reverse osmosis membrane is mainly intake index such as table 2:
The water inlet index of 2 reverse osmosis membrane of table
| Serial number | Project | Index |
| 1 | Temperature | 5-40℃ |
| 2 | Silt density index (SDI) SDI value | < 4.0 |
| 3 | Turbidity (NTU) | < 1.0 |
| 4 | Content of organics (COD) | < 1.5mg/L |
| 5 | Remaining oxygen content | < 0.1mg/L |
| 6 | Iron content | < 0.05mg/L |
| 7 | SiO2 | < 100mg/L |
| 8 | LSI | PHb-pHs < 0 |
| 9 | PH value | 2-11 |
| 10 | SrBa etc. easily forms the ion of difficulty soluble salt | Ipb≤0.8Ksp |
EDI device requirement: reverse osmosis (reverseosmosis, RO) pure water is as EDI water supply, main index such as table of intaking
3:
Table 3EDI equipment water inlet index
| Serial number | Project | Index |
| 1 | Temperature | 5-35℃ |
| 2 | Conductivity | 10 μ s.cm of < |
| 3 | PH value | 6-9 |
| 4 | Hardness (in terms of CaCO3) | < 0.5mg/L |
| 5 | Organic matter | 0-0.5ppm |
| 6 | Oxidant | 0-0.05ppm(Cl2)、0-0.02ppm(O3) |
| 7 | Ferrimanganic | < 0.01ppm |
| 8 | Silica | < 0.5ppm |
| 9 | Carbon dioxide | < 5ppm |
In this application, the oxygen in water is removed using film deaerating plant, compared to thermal de-aeration, deaeration in condenser mode, film
Deaerating plant is highly integrated to be accounted for, ground area is small, 50 μ g/L of water oxygen level < after deoxygenation, and treatment process does not consume steam.
Arrive as used herein, fresh water refers to: the seawater concentrated seawater for meeting water process index after desalination refers to:
Except the seawater of hard demineralizer outlet.Boiler export requires steam quality >=95%, belongs to superheated steam injection boiler, referring to table
4 " GB/T12145-2016 thermal power generation unit and apparatus of steam power plants Water Vapor Qualities ".
4 GB/T12145-2016 thermal power generation unit of table and apparatus of steam power plants Water Vapor Quality
| Standard | GB/T12145-2016 |
| Water process index | Superheat boiler (mass dryness fraction > 90%) |
| Dissolved oxygen, mg/L | ≤0.007 |
| Total hardness is (with CaCO3Meter), mg/L | ≈0 |
| Total iron, mg/L | ≤0.005 |
| Silica, mg/L | ≤0.01 |
| Suspended matter, mg/L | / |
| Total alkalinity, mg/L | / |
| Oil and rouge, mg/L | ≤0.1 |
| Salinity, mg/L | / |
| PH value | 9.0~9.5 |
| Conductivity, μ S/cm | ≤0.1 |
In this application, the desulfation dust-extraction device is that desulfurizing tower makees desulfurizing agent using seawater, to cigarette in desulfurizing tower
Gas carries out inversely spraying washing, sulfur dioxide in flue gas by Absorption by Sea Water at sulphite, it is harmless by being further oxidized to
Sulfate is dissolved in seawater.Sulfate is the natural component in seawater, can directly arrange sea.Main indicator: occupied area is about
40m2-50m2, equipment operation general power 20KW-25KW, seawater demand: 50m3/h-70m3/h；Desulfurizing tower size: Φ 1.0m ×
8m-Φ1.4m×7m。
Desulfurization and dedusting carry out together, absorb soot dust granule while using Absorption by Sea Water sulfur dioxide.
In this application, the deaerating plant is film deaerating plant, and the film is hollow fiber film thread.
In this application, the hollow fiber film thread Standard contact area 60m2-65m2, film wire amount 13000-15000 root,
Hollow 320 μm -350 μm of film wire internal-and external diameter internal diameter, 55 μm -60 μm of wall thickness, maximum intake pressure 0.2Mpa-0.3Mpa, highest into
Water turbidity 8NTU-10NTU, 40 DEG C -45 DEG C of maximum operation (service) temperature, PH tolerance range 1-14.
In this application, the steam generation facility is ocean platform oil burning boiler.
The beneficial effect of the application is mainly the efficient utilization to seawater, is to use energy in terms of sea water desalination first
Recyclable device makes full use of concentrated water pressure, and energy saving ratio can reach 35%-40%；Followed by deoxygenation when use film deoxygenation
Mode does not consume steam；It is to reduce the energy consumption of pumping seawater, expense using concentrated seawater in desulfurization dust-removing technique again
It is low compared with other sulfur removal technologies, and do not reduce work flow from land transport to marine desulfurization process required product.Finally
It is in sulfur removal technology, after exchanging heat with flue gas, effluent gas temperature reduces concentrated seawater, is emitted into atmosphere and reduces greenhouse effects
Influence, and concentrated seawater temperature increases, and the fresh water before utilizing its heat and oil burning boiler entrance exchanges heat, fresh water heating, reduces combustion
Thermo oil boiler energy consumption.
Other features and advantage will illustrate in the following description, also, partly become from specification
It obtains it is clear that being understood and implementing the application.The purpose of the application and other advantages can be by specifications, right
Specifically noted structure is achieved and obtained in claim and attached drawing.
Detailed description of the invention
Attached drawing is used to provide to further understand technical scheme, and constitutes part of specification, with this
The embodiment of application is used to explain the technical solution of the application together, does not constitute the limitation to technical scheme.
Fig. 1 is the schematic diagram of the efficient water treatment technology of platform according to embodiment of the present invention.Wherein, attached drawing mark
Corresponding relationship between note and systematic name are as follows: 1 elevator pump, 2 raw water tanks, 3 pretreatment units, 4 high-pressure pumps, 5 energy regeneratings dress
Set, 6 remove hard demineralizer, 7 film deaerating plants, 8 heat-exchanger rigs, 9 steam generation facilities, 10 stratum, 11 desulfation dust-extraction devices, 12
Processing unit.
Specific embodiment
For the purposes, technical schemes and advantages of the application are more clearly understood, below in conjunction with attached drawing to the application
Embodiment be described in detail.It should be noted that in the absence of conflict, in the embodiment and embodiment in the application
Feature can mutual any combination.
The present invention is sequentially connected 2 raw water tanks, 3 pretreatment units, 4 high-pressure pumps and 5 energy regeneratings by 1 seawater lift pump
Device, wherein 4 high-pressure pump of raw water piping connection in energy recycle device and 6 removes hard demineralizer, and concentrated water piping connection 6 is except hard
Demineralizer and 11 desulfation dust-extraction devices, except hard demineralizer connects 7 film deaerating plants.Fresh water line connects 8 heat-exchanger rigs, with
Subsequent concentrated seawater heat exchange enters 9 oil burning boilers generation steam after improving temperature, is connected to platform well mouth by steam pipework, injects
10 stratum；11 desulfation dust-extraction device of concentrated seawater piping connection, the flue that concentrated seawater is generated as desulfurization and dedusting medium, oil burning boiler
Gas enters desulfation dust-extraction device by pipeline, is discharged into atmosphere after reaching discharge standard, and concentrated seawater with flue gas by changing
Temperature increases after heat, and the fresh water into before heat-exchanger rig heated fuel oil boiler inlet is allowed to heat up, and reduces oil burning boiler energy consumption,
Seawater after cooling passes through 12 processing units, to seawater cooling and reacts heel row to sea.
Embodiment
The application is described in further detail below in conjunction with attached drawing, so that those skilled in the art can practice this
Application.It should be appreciated that other embodiments can be used, and change appropriate can be made without departing from spirit herein
Or range.In order to avoid for enabling those skilled in the art to practice unnecessary details for the application, specification may
Known certain information to those skilled in the art are omitted.Therefore, described in detail below should not be with restrictive meaning
Justice understands, and scope of the present application is limited solely by the scope of the following claims.
General Principle of the invention only is illustrated so that the seawater of certain marine viscous crude field efficiently utilizes as an example below, but should be infused
Meaning, the present invention are not limited to the offshore viscous oil field.
The offshore viscous oil field is developed using steam soak mode, and oil burning boiler has strict demand to water quality.Cause
This, it is necessary to water treatment facilities are used, seawater is subjected to desalt processing, hard desalination deoxygenation is removed, could supply water to equipment.Meanwhile it firing
Sulfur compound and dust in the flue gas that thermo oil boiler generates need to arrange after desulfurization and dedusting processing is up to standard into atmosphere.
Referring to Figure 1, the present invention passes through the 1 elevator pump extracting seawater to 2 raw water tanks of offshore platform first, it is desirable that seawater row
Amount >=100m3/h.Then PAC flocculant, sodium hypochlorite fungicide, four sodium (HEDPNa of 1-hydroxy ethylidene-1,1-diphosphonic acid is added4)。
Sodium hydrogensulfite reducing agent etc. carries out 3 pretreatments to seawater, is filtered using high efficiency particulate air filter to seawater, pre- to locate
Seawater after reason passes sequentially through 5 energy recycle devices, 6 except hard demineralizer and 7 film deoxygenations fill after the pressurization of 4 high-pressure pumps
It sets, wherein energy recycle device recycles the high pressure energy 35% or so of concentrated seawater, and film deaerating plant is highly integrated, takes up an area face
Product smaller, 50 μ g/L of water oxygen level < after deoxygenation, preferably 1 μ g/L-7 μ g/L and treatment process does not consume steam.
20 DEG C -30 DEG C of the fresh water generated accesses 8 heat-exchanger rigs, rises to 35 DEG C or so with temperature after concentrated seawater heat exchange, so
Fresh water enters 9 oil burning boilers afterwards, generates the high-temperature steam of pressure 21MPa, 370 DEG C of temperature, mass dryness fraction 95%-100%, injects 10 ground
Layer, while generating 150 DEG C -170 DEG C of flue gas.Concentrated seawater after decompression enters 11 desulfation dust-extraction devices, connects with high-temperature flue gas
The sulfur-containing compound in gas is absorbed after touch and is reacted, desulfurization dust-removing efficiency 90%-95%.Concentrated seawater is changed with flue gas
Heat reduces effluent gas temperature, and flue gas is discharged into atmosphere, and reduce greenhouse effects influences caused by atmosphere.Dense sea after heating
Water passes through 8 heat-exchanger rigs, and the fresh water needed with oil burning boiler exchanges heat, and is allowed to heat up, and reduces boiler energy consumption.The seawater that temperature reduces
It is neutralized by the oxidation of 12 processing units, aeration, makes quality recovery to related sea area emission request is met, then divide three branch pipe rows
Enter sea.
Although embodiment disclosed by the application is as above, the content only for ease of understanding the application and use
Embodiment is not limited to the application.Technical staff in any the application fields, is taken off not departing from the application
Under the premise of the spirit and scope of dew, any modification and variation, but the application can be carried out in the form and details of implementation
Scope of patent protection, still should be subject to the scope of the claims as defined in the appended claims.
Claims (11)
1. a kind of ocean platform efficiently utilizes the technique of seawater, the technique includes:
(1) by seawater lift, pretreatment, filtering, pressurization；
(2) seawater obtained in step (1) is carried out obtaining fresh water and concentrated seawater except hard desalination
(3) fresh water for obtaining step (2) carries out deoxygenation；
(4) concentrated seawater for obtaining step (2) carries out energy regenerating, then carries out desulfurization and dedusting together with flue gas, desulfurization is removed
Flue gas emission after dirt；
(5) concentrated seawater after the fresh water and step (4) desulfurization and dedusting after step (3) deoxygenation is subjected to heat exchange；
(6) fresh water after step (5) heat exchange is vaporized, generates steam, the steam injects stratum；
(7) concentrated seawater after step (5) heat exchange is handled, discharge.
2. technique according to claim 1, wherein in step (1), the pretreatment includes addition chemical agent,
Described in chemical agent include any one of flocculant, fungicide, antisludging agent, reducing agent or more.
3. technique according to claim 1, wherein in step (3), 50 μ g/L of water oxygen level < after deoxygenation.
4. technique according to claim 1, wherein in step (3), water oxygen level is 1 μ g/L-7 μ g/L after deoxygenation.
5. technique according to claim 1, wherein in step (5), after heat exchange, concentrated seawater temperature be increased to 35 DEG C-
40℃。
6. the system for carrying out technique described in any one of claims 1 to 5, the system comprises pretreatment units, energy
It measures recyclable device, remove hard demineralizer, deaerating plant, heat-exchange device, steam generation facility, desulfation dust-extraction device.
7. system according to claim 6, wherein described except hard demineralizer includes that reverse osmosis membrane and continuous electric desalination are set
It is standby.
8. system according to claim 6, wherein the desulfation dust-extraction device is desulfurizing tower, makees desulfurizing agent using seawater.
9. system according to claim 6, wherein the deaerating plant is film deaerating plant, and the film is doughnut
Film wire.
10. system according to claim 9, wherein 320 μm -350 μm of the hollow membrane silk internal diameter, 55 μm -60 μm of wall thickness.
11. system according to claim 5, wherein the steam generation facility is ocean platform oil burning boiler.
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| CN112924405A (en) * | 2021-01-27 | 2021-06-08 | 华能（天津）煤气化发电有限公司 | Concentrated seawater total nitrogen data continuous online monitoring system for seawater cooling power plant |
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| CN115364645A (en) * | 2022-08-01 | 2022-11-22 | 巩义市良慧环保科技有限公司 | Molecular membrane method flue gas desulfurization and decarburization system and desulfurization and decarburization method thereof |
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Application publication date: 20190607 |