CN102120138B - Magnesium base-seawater method desulfurization system for ship - Google Patents

Magnesium base-seawater method desulfurization system for ship Download PDF

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Publication number
CN102120138B
CN102120138B CN 201110039565 CN201110039565A CN102120138B CN 102120138 B CN102120138 B CN 102120138B CN 201110039565 CN201110039565 CN 201110039565 CN 201110039565 A CN201110039565 A CN 201110039565A CN 102120138 B CN102120138 B CN 102120138B
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seawater
slurry
desulfurization
smoke
spray
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CN102120138A (en
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朱益民
唐晓佳
郝阳
刘爽
李铁
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Dalian Maritime University
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Dalian Maritime University
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Abstract

The invention discloses a magnesium base-seawater method desulfurization system for a ship, which mainly comprises a desulfurizing tower, a seawater cooling and spraying unit, a sizing tank, a multi-stage spraying device and seawater, wherein smoke of a ship boiler is cooled through spraying of seawater under the drive of a fan, the temperature of the smoke of the boiler is reduced to below 100 DEG C, the concentration of SO2 in the smoke of the boiler is reduced to reach the standard for emission through the reaction of Mg(OH)2 size spray of the multi-stage spraying device with the SO2 in the smoke of the boiler. MgSO3 as a reaction product is settled to the sizing tank with the spray liquid and forms MgSO4 through oxidization, and the MgSO4 is discharged with water. The system realizes that a magnesium base-seawater method desulfurization technology is applied to efficient desulfurization of the smoke of the ship, can be reliably operated for a long time in a standard-reaching manner, and lays the firm technical preparation for dealing the new ship oil sulfur content standard required to be executed by the IMO (International Maritime Organization) in China.

Description

Magnesium base-seawater method desulphurization system peculiar to vessel
Technical field
The present invention relates to the flue gas desulfurization technique field, refer more particularly to the system of magnesium method and the desulfurization of seawater method.
Background technology
The sulfur content standard that the bunker fuel oil executed is very strict allows ship to use the emission-reduction technology through approval simultaneously, and condition is SO 2Discharging is equal to or less than the Low Sulfur Fuel Oil of burning 0.10%.Adopt the low fuel oil of sulfur-bearing will significantly improve vessel operating cost, so flue gas desulfurization becomes the most practicable selection of reply new standard.
With respect to dry method and semidry method, wet desulphurization is used widely with its mature technique.The most successful desulfur technology that reaches commercial Application is a chemical method at present, comprises calcium method, magnesium method and the desulfurization of seawater method.The influence of factors such as handle in geographical position, desulfuration byproduct because the seawater method receives, desulfurizing agent source and price, usually be applied in that regionality is strong, exhaust gas volumn is less relatively or the better simply desulfurization project of technological requirement in; Lime (stone)-gypsum law technology maturation, low price, desulfuration efficiency height, so application is more, but its operating cost is high, secondary pollution is serious, be prone to cause pipeline scale to stop up; The desulfurization of magnesium method has that system is simple, security of operation, reliability is high, operating cost is low, desulfuration efficiency is high, applied widely, less scaling, non-secondary pollution, by-product utilization are worth more high relatively advantage, and the trend that progressively replaces the desulfurization of calcium method was arranged in recent years.
The strictness of boats and ships desulfurization index receives the restriction of specific environment on the ship again in the general industry desulfurization, and desulfurization research and development application technology peculiar to vessel and difficulty in process are very big, still belongs to blank so far at home and abroad.Take which kind of method desulfurization to decide with requiring the desulfurization index that reaches according to concrete operating mode.For desulfurization on the specific ship,,, require desulfuration efficiency to reach 70-80% at least for reaching the corresponding equivalent of sulfur-bearing 1.00%m/m if use used fuel oil (sulfur-bearing is less than 4.5%m/m); For reaching the corresponding equivalent of sulfur-bearing 0.10%m/m, require desulfuration efficiency to reach 97% at least.Because calcium method desulfuration efficiency is below 95%, magnesium method desulfuration efficiency can reach 99%, so have only the desulfurization of magnesium method can reach the corresponding SO of new standard 2The concentration of emission value.Consider that simultaneously the space is limited on the ship, do not allow device to account for a large amount of volumes, consumptive material or accessory substance bulk deposition,, can only adopt the method for abandoning in the desulfurization of magnesium base so simple seawater method and the desulfurization of calcium method are all inadvisable.Advantage such as the desulfurization of magnesium base has non-secondary pollution simultaneously, take that volume is little, non-scaling, operating cost are low, to sum up, magnesium base desulfur technology is the most practicable to desulfurization peculiar to vessel.Moreover, consider the boats and ships operating mode, seawater obtains easy fresh water and obtains difficulty on the ship, proposes magnesium base-seawater method desulfur technology and is used for the boats and ships desulfurization.The seawater method only adopts the desulfurization of magnesium base as a kind of householder method when boats and ships run on the fresh water district, receive seawater corrosion in conjunction with the seawater method to avoid treating apparatus.Magnesium base-seawater method desulfur technology is a kind of effective desulfur technology that is applicable to the boats and ships specific operation, yet domestic and international this boats and ships desulfur technology belongs to blank.
Summary of the invention
For realizing that magnesium base-seawater method desulfur technology is applied to boats and ships flue gas high-efficiency desulfurization; The present invention provide a kind of can be reliably and with long-term, the magnesium base-seawater method desulphurization system peculiar to vessel of operation up to standard, the bunker oil sulfur content new standard that requires to carry out for China reply IMO is carried out solid technology and is prepared.
Principle of the present invention is: through the sea water spray mist cooling, reduce to below 100 ℃, through multistage Mg (OH) by flue-gas temperature under blower fan drives for the boats and ships flue gas 2SO in slurry spraying and the flue gas 2Reaction reduces SO in the flue gas 2Concentration is to qualified discharge.Product MgSO 3Reduce to slurry pool with spray liquid, form MgSO through oxidation 4, discharge with draining.Inject the Mg (OH) of preparation according to certain flow 2Slurry is regulated slurry liquid pH value, guarantees high-efficiency desulfurization, replenishes new water, discharging reaction back spray liquid according to certain flow, keeps the slurry pool liquid level constant.
Technical solution of the present invention is achieved in that system mainly comprises desulfurizing tower, cooled with seawater sprayer unit, slurry tank, multi-stage spray device, seawater; Be provided with slurry pool in described desulfurizing tower bottom; Slurry pool top is the multi-stage spray device; Through oxidation fan aerating oxygen in slurry pool, in slurry pool, feed seawater through sea water pump, the slurry pool bottom is provided with excavationg pump; The top of described slurry tank is provided with steam, magnesia powder, seawater pipeline; Wherein jet chimney is provided with electronic steam valve; Seawater pipeline is provided with the seawater flow meter; Be provided with agitator in the slurry tank, slurry tank lower end discharge pipe is provided with the frequency conversion tubing pump, also is provided with the slurry flow meter on the discharge pipe and is connected to the multi-stage spray device; The multi-stage spray device also is connected to slurry pool through spray pump; Boiler smoke gets into the cooled with seawater sprayer unit through the smoke discharging pipe that is provided with electric butterfly valve, frequency conversion fan, flue gas flow meter successively, and the cooled with seawater sprayer unit gets into desulfurizing tower along the spraying of boiler smoke direction of ventilation through the boiler smoke that cools off; The desulfurizing tower top is provided with demist net and new water spray system, handles the back flue gas and also discharges from the exhaust opening entering chimney of desulfurizing tower, and the exhaust opening sidewall is provided with SO 2The analyzer probe; Also be provided with pH meter, float type level gauge in the slurry pool.
Through Mg (OH) 2Slurry multi-stage spray device, slurry pH regulation and control, plumbing control develop this magnesium base-seawater method desulphurization system peculiar to vessel, and pass through SO 2Corresponding optimization operational factor is confirmed in concentration determination, implement device reliably and with long-term, operation up to standard.
Draw boiler smoke from flue collector,, show the air inducing air quantity through the flue gas flow meter through electric butterfly valve and frequency conversion fan interlock control air inducing; Pending boiler smoke gets into the sea water spray mist cooling unit by the frequency conversion fan outlet; Along boiler smoke direction of ventilation spraying, below the cooled flue gas temperature to 100 ℃, the auxiliary desulfidation that plays; And help boiler smoke air inducing, the boiler smoke of cooling fluid and warp cooling together gets into desulfurizing tower.Desulfurizing tower is provided with multi-stage spray device and the constant slurry pool about 1m of liquid level, and oxidation fan provides oxygen in slurry pool.Adopt spray pump to extract slurry circulation chilling spray in the slurry pool, circular response spray, form cooling fluid and spray liquid and under the gravity effect, drop to slurry pool, the boiler smoke air-flow upwards finally is discharged in the atmosphere through exhaust opening demist net mist elimination.Drop into seawater and magnesia powder in the slurry tank in proportion; Stir and the steam constant temperature heating through motor; Discharging opening branch multichannel quantitatively provides slurry to each spray piping from the slurry tank lower end through the frequency conversion tubing pump after the slaking, adopts valve and slurry flow meter accurately to control the slurry quantity delivered.Carry out with reaction, slurry pH descends gradually in the slurry pool, for guaranteeing high-efficiency desulfurization, confirms the slurry pH excursion between the 6.5-11, is equipped with pH meter and monitors in real time.The slurry pool liquid level reduces because of the evaporation in the flue gas cooling procedure gradually simultaneously, at sidewall the evaporated water in the float type level gauge reflection cooling procedure is installed.The slurry pool outer wall connects excavationg pump and sea water pump; According to slurry pH situation of change and application requirements; Control excavationg pump flow and frequency are discharged reaction back waste liquid, and the step control sea water pump of going forward side by side replenishes fresh seawater by certain flow and frequency; Keep the slurry pool liquid level constant about 1m, have the function of regulating slurry pH concurrently.The desulfurizing tower top is provided with demist net and new water spray system, and the unlatching of measuring the new water spray system of control through flue gas flow is played the effect that replenishes new water simultaneously with timely cleaning demist net.The exhaust opening sidewall is provided with SO 2The analyzer probe is used for SO 2Concentration determination.SO according to discharging 2Concentration value changes slurry multi-stage spray device reaction progression, regulates the spray liquid flow through the frequency conversion spray pump, keeps SO 2Concentration is to qualified discharge.
The invention has the beneficial effects as follows: realized that magnesium base-seawater method desulfur technology is applied to boats and ships flue gas high-efficiency desulfurization, can be reliably and with long-term, operation up to standard, the bunker oil sulfur content new standard that requires to carry out for China reply IMO is carried out solid technology and is prepared.
Description of drawings
Below in conjunction with accompanying drawing and concrete embodiment the present invention is further described.
Fig. 1 is a systematic schematic diagram of the present invention.
Among the figure, 1, desulfurizing tower, 2, slurry tank, 3, chimney, 4, slurry pool, 5, seawater; 6, steam, 7, magnesia powder, 8, sea water pump, 9, the seawater flow meter, 10, motor-driven valve, 11, electronic steam valve; 12, frequency conversion tubing pump, 13, the slurry flow meter, 14, spray pump, 15, excavationg pump, 16, waste liquid, 17, oxidation fan; 18, boiler smoke, 19, electric butterfly valve, 20, frequency conversion fan, 21, the flue gas flow meter, 22, handle back gas.
The specific embodiment
Specify the present invention below in conjunction with embodiment.
Desulfurized effect was tested before and after real ship carried out system of the present invention use on certain container ship, used sulfur-bearing 0.71~0.93%m/m fuel oil, normal sail, the about 50000m of main frame discharging waste gas air quantity 3/ h.Adopt 440V, 60Hz three-phase alternating current ship electricity power supply native system, the air inducing air quantity is less than 10000m 3/ h, air inducing power of fan are that 10~30kW is adjustable, and slurry frequency conversion pipeline pump power is adjustable less than 3kW, and pressure 3.5~4.0atm, slurry supply flow rate are 0.1~1.0m 3/ h is adjustable (Mg (OH) 2Slurry concentration is less than 25%).The circulated sprinkling pump power is that 10~30kW is adjustable, and slurry sprays less than 100m 3/ h is adjustable.In 10 hours, the continuous service test result sees the following form.
Annotate: slurry circulated sprinkling pump discharge value is the estimation gained.
Under test condition at that time, this ship successively uses sulfur-bearing 0.71%mm and two kinds of fuel oil of 0.93%m/m, because the mixing of two kinds of different fuels oil cause SO 2Initial concentration fluctuates in the scope of 240~320ppm.Provide the experimental data contrast of seawater method and the magnesium base-seawater method that adopts system of the present invention.Data show that exhaust gas volumn increases, the final back SO that handles 2Concentration also increases thereupon; The circulated sprinkling amount is big more, handles back SO 2Concentration is more little.Simple employing seawater method desulfurization degree>70%, and the magnesium of system of the present invention base-seawater method desulfurization degree>90% can find out that latter's desulfurized effect obviously is superior to the former.This system applies on real ship, the SO after the desulfurization 2Content is lower than the Low Sulfur Fuel Oil of burning 0.10%, meets the requirement of bunker oil sulfur content new standard.This shows that this desulphurization system has significant reduction of discharging effect.
The present invention is not limited to the foregoing description, and protection scope of the present invention is all classified in any equivalent concepts or change in the technical scope that the present invention discloses as.

Claims (1)

1. magnesium base-seawater method desulphurization system peculiar to vessel; It is characterized in that: mainly comprise desulfurizing tower (1), cooled with seawater sprayer unit, slurry tank (2), multi-stage spray device, seawater (5); Be provided with slurry pool (4) in described desulfurizing tower (1) bottom, slurry pool (4) top is the multi-stage spray device, through oxidation fan (17) aerating oxygen in slurry pool (4); In slurry pool (4), feed seawater through sea water pump (8), slurry pool (4) bottom is provided with excavationg pump (15); The top of described slurry tank (2) is provided with steam (6), magnesia powder (7), seawater pipeline; Wherein jet chimney is provided with electronic steam valve (11); Seawater pipeline is provided with seawater flow meter (9); Slurry tank is provided with agitator in (2), and slurry tank (2) lower end discharge pipe is provided with frequency conversion tubing pump (12), also is provided with slurry flow meter (13) on the discharge pipe and is connected to the multi-stage spray device; The multi-stage spray device also is connected to slurry pool (4) through spray pump (14); Boiler smoke (18) gets into the cooled with seawater sprayer unit through the smoke discharging pipe that is provided with electric butterfly valve (19), frequency conversion fan (20), flue gas flow meter (21) successively; The cooled with seawater sprayer unit is along the spraying of boiler smoke direction of ventilation, through the boiler smoke entering desulfurizing tower (1) of cooling; Desulfurizing tower (1) top is provided with demist net and new water spray system, handles back flue gas (22) and also discharges from the exhaust opening entering chimney (3) of desulfurizing tower, and the exhaust opening sidewall is provided with SO 2The analyzer probe; Slurry pool also is provided with pH meter, float type level gauge in (4).
CN 201110039565 2011-02-17 2011-02-17 Magnesium base-seawater method desulfurization system for ship Active CN102120138B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11124714B2 (en) 2020-02-19 2021-09-21 Marathon Petroleum Company Lp Low sulfur fuel oil blends for stability enhancement and associated methods

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US9387438B2 (en) 2014-02-14 2016-07-12 Tenneco Automotive Operating Company Inc. Modular system for reduction of sulphur oxides in exhaust
CN104923056A (en) * 2015-06-26 2015-09-23 大连海事大学 Marine exhaust gas desulfurization unit and method
CN106731639A (en) * 2017-03-03 2017-05-31 河北工业大学 A kind of new sea water desulfuration Carbon fixation method

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CN101708413A (en) * 2009-11-26 2010-05-19 浙江蓝天求是环保集团有限公司 Packless empty tower spraying type magnesium-process flue gas desulfurization purification system
CN201940168U (en) * 2011-02-17 2011-08-24 大连海事大学 Marine desulfurization system using magnesium-based seawater method

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CN101708413A (en) * 2009-11-26 2010-05-19 浙江蓝天求是环保集团有限公司 Packless empty tower spraying type magnesium-process flue gas desulfurization purification system
CN201940168U (en) * 2011-02-17 2011-08-24 大连海事大学 Marine desulfurization system using magnesium-based seawater method

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US11124714B2 (en) 2020-02-19 2021-09-21 Marathon Petroleum Company Lp Low sulfur fuel oil blends for stability enhancement and associated methods

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Application publication date: 20110713

Assignee: WEIHAI PUYI SHIP ENVIRONMENTAL PROTECTION TECHNOLOGY CO., LTD.

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Denomination of invention: Magnesium based seawater marine desulfurization system

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