CN112933881A - High-specific-surface-area ship flue gas seawater desulfurization process and system - Google Patents
High-specific-surface-area ship flue gas seawater desulfurization process and system Download PDFInfo
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1456—Removing acid components
- B01D53/1481—Removing sulfur dioxide or sulfur trioxide
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/1493—Selection of liquid materials for use as absorbents
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/14—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by absorption
- B01D53/18—Absorbing units; Liquid distributors therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/508—Sulfur oxides by treating the gases with solids
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/92—Chemical or biological purification of waste gases of engine exhaust gases
- B01D53/94—Chemical or biological purification of waste gases of engine exhaust gases by catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2252/00—Absorbents, i.e. solvents and liquid materials for gas absorption
- B01D2252/10—Inorganic absorbents
- B01D2252/103—Water
- B01D2252/1035—Sea water
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2255/00—Catalysts
- B01D2255/80—Type of catalytic reaction
- B01D2255/802—Photocatalytic
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/01—Engine exhaust gases
- B01D2258/012—Diesel engines and lean burn gasoline engines
Abstract
A seawater desulfurization process and a seawater desulfurization system for ship flue gas with high specific surface area are used for carrying out desulfurization treatment on flue gas discharged by a sulfur-containing ship diesel engine, and comprise the following steps: filling a high-specific-surface-area hydrophilic filler into the washing tower, and spraying seawater into the washing tower from the upper part of the washing tower; injecting flue gas into the lower part of a washing tower, and carrying out countercurrent contact on the flue gas, seawater and a hydrophilic filler with a high specific surface area in the washing tower to carry out desulfurization reaction to obtain waste seawater and clean flue gas; the waste seawater is discharged from the bottom of the washing tower, and the clean flue gas is discharged from the top of the washing tower, so that the technical problem of poor desulfurization effect caused by large size of desulfurization equipment and complex desulfurization mode in the traditional desulfurization method is solved, and the method can be widely applied to the fields of ship waste gas treatment and energy conservation and environmental protection.
Description
Technical Field
The application relates to the field of ship waste gas treatment and energy conservation and environmental protection, in particular to a ship flue gas seawater desulfurization process and system with a high specific surface area.
Background
At present, 85% of goods in the world are transported by sea, about 38 million ships with AIS positions in the world and about 2.6 million ships with over ten thousand tons are transported by sea. 4309 international sailing ships of Chinese nationality, 1345 ships of over ten thousand tons, 6103 ships controlled by the shipowner of China, and 2517 ships of over ten thousand tons. 12.17 million ships are active in one week in China. In ships with more than 1 million loads, dry bulk carriers account for 38.85%, container ships account for 17.09%, and oil tankers account for 13.16%. Among these vessels, the diesel engine vessels using heavy diesel oil as fuel have the largest reserve, the technology of the marine diesel engine is mature, the global fuel supply chain and the ship maintenance chain are the most perfect, the distribution is the widest, the technical personnel and the operation regulation configuration are the best, and the diesel engine vessels can almost reach any port all over the world. It is calculated and counted that shipping vessels consume approximately 3 million tons of fuel oil per year, thereby producing large quantities of flue gas containing sulfur, nitrate and carbon dioxide. According to the article in journal of economic scholars in England, 15 ocean-going large ships with the largest tonnage discharge sulfur and nitrogen oxides beyond the global automobile discharge. Global ocean going vessels must therefore be modified to meet IMO emissions limits. At present, various optional strategies exist for the flue gas desulfurization of ships: 1. the clean low-sulfur fuel oil is used, but the high price of the clean low-sulfur fuel oil is 1.16 times higher than that of the light diesel oil containing 0.5 percent of sulfur in the sea, because the heavy diesel oil with high calorific value and high viscosity contains a large amount of high-steric-hindrance sulfides such as 2,4 dibenzothiophene and the like, the desulfurization cost is very high, the price difference can be generally kept for 70-300 dollars per ton for a long time, the expensive low-sulfur shipping companies are difficult to accept, and moreover, the low-sulfur diesel oil has certain influence on the working parameters, the calorific value, the pipeline leakage, the lubricity, the health of crew and the like of the diesel engine, and is not beneficial to the maintenance of the marine diesel engine. 2. The installation of scrubbers to remove pollutants from flue gases is currently one of the most promising methods generally accepted. Various harmful pollutants in the flue gas are removed in a unified way by installing a washing tower at a flue gas outlet, wherein the harmful pollutants comprise carbon dioxide, SO2, NOx, VOCs, part of CO2 and the like, the operation cost and investment of the washing tower are inversely proportional to the sulfur content of the fuel oil, the sulfur content of the fuel oil is low, and the investment and operation cost of the corresponding washing tower are also low. Therefore, the price difference between low-sulfur fuel oil and high-sulfur fuel oil is avoided from being reduced, the operation cost is increased possibly due to the selection of the low-sulfur fuel oil, and the synchronous operation cost of the flue gas purification washing tower is also reduced sharply when the low-sulfur fuel oil is selected; 3. by adopting a dual-fuel system, heavy oil with high sulfur content is adopted in the open sea navigation, and light diesel oil with low sulfur content is adopted in 200 seas away from the sea shore, obviously, the method can only be a transition measure, and along with the improvement of a real-time detection means, the smoke pollution emission of the ship in the open sea navigation is also limited; 4. the shore power application technology is characterized in that a diesel generator on a ship is stopped during berthing of the ship, and a land power supply is used for supplying power, so that the exhaust emission is reduced, and obviously, the method is only effective when the ship is berthed; 5. an Exhaust Gas Recirculation (EGR) technology and a common-rail electronic control fuel injection technology can reduce partial NOx emission, but increase fuel consumption and PM content, and are not adopted in a large scale at present; 6. by adopting the LNG power system, the desulfurization can meet the IMO requirement, but the denitration cannot meet the IMO requirement, the ship building cost is high, and the safety requirement is high. The economy and safety of the method are still waiting for time check.
From the above analysis, it can be seen that the installation of a seawater scrubber to remove pollutants from ship flue gas is one of the best generally recognized methods. The reliability of the scrubbing tower and the efficiency of the scrubbing tower for reducing emission are discussed in a workshop of London in 20.2.2020, and the flue gas scrubbing tower has a wide application prospect in treating waste gas practically summarized by more than 200 ship-mounted desulfurization scrubbing towers of three great shippers in Europe.
The seawater desulfurization technology began in the last 70 th century and was rapidly popularized and applied in coastal power plants in europe, america, asia, and the like. As is well known, natural seawater contains a large amount of soluble salts, is generally alkaline, has natural alkalinity of 1.2-2.5 mmol/L, and has natural acid-base buffering capacity and SO absorption capacity2The capacity of the method is a theoretical basis for directly using seawater for flue gas desulfurization.
The core of the seawater desulfurization process is the contact mass transfer of the flue gas and the seawater, and the process is carried out in gas-liquid contact mass transfer equipment. The packed tower is mass transfer equipment taking the packing in the tower as a gas-liquid two-phase contact member, has the characteristics of high separation efficiency, small resistance, large flux, large operation elasticity and the like, and has good gas-liquid initial distributionThere is almost no amplification effect. When the traditional marine flue gas seawater desulfurization washing tower is used, the IMO requirement is met, the liquid-gas ratio is very high and is generally 10L/m3I.e. removing 1m3The sulfur in the flue gas needs to be sprayed with 10 liters of seawater, so that the defects of overlarge volume of a filler washing tower and the diameter of a seawater pipeline, numerous auxiliary equipment and the like are caused. The liquid-gas ratio is high, which causes the power of the sea water pump to be high, the equipment to be heavy and the occupied area to be large. Therefore, the invention provides a ship flue gas seawater desulfurization technology with high specific surface area and hydrophilic regular catalytic packing, which greatly reduces the liquid-gas ratio and the volume of a washing tower and the diameter of a seawater pipeline.
China has a long coastline, nearly 50% of people live near the coastline in China, nearly 70% of GDP in China comes from cities and areas on the coastline, and a plurality of coal-fired power plants for seawater desulfurization are built in coastal areas. Therefore, the flue gas seawater desulfurization technology of the hydrophilic regular catalytic packing with the high specific surface area has important practical significance and strategic significance for the flue gas desulfurization of ships and the seawater desulfurization of coastal coal-fired power plants.
Disclosure of Invention
The application aims to provide a seawater desulfurization process and a seawater desulfurization system for ship flue gas with high specific surface area, and aims to solve the technical problem that the traditional desulfurization method has poor desulfurization effect due to large volume and complex desulfurization mode of desulfurization equipment.
The first aspect of the embodiment of the application provides a seawater desulfurization process for ship flue gas with a high specific surface area, which is used for performing desulfurization treatment on flue gas discharged by a sulfur-containing ship diesel engine, and comprises the following steps:
s1, filling a high-specific-surface-area hydrophilic filler into the washing tower, and spraying seawater into the washing tower from the upper part of the washing tower;
s2, injecting flue gas into the lower part of the washing tower, wherein the flue gas is in countercurrent contact with the seawater and the hydrophilic filler with the high specific surface area in the washing tower to perform a desulfurization reaction, so that waste seawater and clean flue gas are obtained;
s3, discharging the waste seawater through the bottom of the washing tower, and discharging the clean flue gas through the top of the washing tower.
In one embodiment, the seawater waste in S2 is also used for cooling the flue gas, and the temperature of the flue gas is adjusted by adjusting the volume of the seawater waste.
In one embodiment, the flue gas temperature in the lower part of the washing tower is 80 ℃, and the flue gas temperature in the washing tower contacted with the high specific surface area hydrophilic packing is 60 ℃.
In one embodiment, the high specific surface area hydrophilic filler is a structured filler surface-coated catalyst composite with a specific surface area of 2500m2/m3Bulk density of 320-650 kg/m3The void ratio is 70-90%, the F factor is 1.5-3.5, the wave pitch is 10-55 mm, and the tooth form angle is 30-80.
In one embodiment, the active component of the catalyst is TiO2-Al2O3。
A second aspect of the embodiment of the application provides a high specific surface area boats and ships flue gas sea water desulfurization system, including the scrubbing tower, the inside of scrubbing tower is equipped with the hydrophilic filler of high specific surface area, the lower part of scrubbing tower is equipped with the flue gas entry, the top of scrubbing tower is equipped with the exhanst gas outlet, the upper portion of scrubbing tower is equipped with sea water spray set, the bottom of scrubbing tower is equipped with the sea water export.
In one embodiment, the seawater spraying device is connected with a seawater pump through a seawater pipeline, and the seawater pump is arranged in the sea.
In one embodiment, the outer plate surface of the washing tower is made of carbon steel, and the inner plate surface of the washing tower is made of titanium.
In one embodiment, the scrubber tower is a rectangular tower or a circular tower.
The invention provides a high specific surface area ship flue gas seawater desulfurization process and a system thereof, which adopts a specific surface area as high as 2500m2/m3The hydrophilic regular catalytic filler has the advantages of fast mass transfer, good wettability, catalytic oxidation activity, small pressure drop, large flux, seawater corrosion resistance, long service life and liquid-gas operationSmall, and the like; the surface of a filler with high specific surface area is coated with a catalyst TiO2-Al2O3Can easily make SO in flue gas2Is catalytically oxidized into SO3The method has the advantages of reducing the content of sulfite entering the aeration tank from the source, improving the content of sulfate radicals, reducing the COD value of the desulfurized seawater, obviously reducing the area and the volume of the aeration tank in engineering, reducing the aeration quantity of air and reducing the mixing quantity of fresh seawater, thereby obviously reducing the engineering cost and reducing the ship space occupied by a washing desulfurization system.
Drawings
FIG. 1 is a schematic flow chart of a process for seawater desulfurization of flue gas from a ship with a high specific surface area according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a marine flue gas seawater desulfurization system with a high specific surface area according to an embodiment of the present application.
The symbols in the drawings illustrate that:
1. a washing tower; 2. a high specific surface area hydrophilic filler; 3. a flue gas inlet; 4. a flue gas outlet; 5. sea water
A water spray device; 6. a seawater outlet; 7. a seawater pipeline; 8. a sea water pump; 9. the ocean.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
The traditional seawater desulfurization process usually adopts random packing polypropylene, metal or ceramic structured packing. Generally, these structured packings have a maximum specific surface area of not more than 700m2/m3Surface hydrophilic modification and catalyst loading are also not contemplated. According to the mass transfer theory, Q ═ kda(C0-Ct) I.e. in the concentration difference (C)0-Ct) Under certain conditions, the mass transfer rate and the mass transfer coefficient kdProportional to the specific surface area of the filler. I.e. the higher the specific surface area of the filler, the mass transferThe faster the rate. And, a mass transfer coefficient kdThe Re number is related to the Re number of the fluid, namely the thickness of a Plant boundary layer, and is closely related to the hydrophilicity of the surface of the filler, when the filler has strong hydrophilicity, the surface liquid holdup is large, the mass transfer is fast, and the high Re number can not cause the occurrence of flooding, so that the operation is deteriorated. Meanwhile, the traditional filler has no catalytic function, SO that SO in the flue gas is caused2The gas-liquid mass transfer rate of the sprayed seawater on the surface of the filler only depends on the mass transfer rate and Henry's theorem.
Example 1
Referring to fig. 1, a schematic flow chart of a seawater desulfurization process for ship flue gas with a high specific surface area according to an embodiment of the present application is shown, for convenience of description, only the relevant parts of the embodiment are shown, and detailed descriptions are as follows:
in one embodiment, the first aspect of the present application provides a seawater desulfurization process for marine flue gas with a high specific surface area, which is used for performing desulfurization treatment on flue gas discharged from a sulfur-containing marine diesel engine, and includes the following steps:
and S1, filling a high-specific-surface-area hydrophilic filler into the washing tower, and spraying seawater into the washing tower from the upper part of the washing tower.
Specifically, the washing tower is internally provided with a loaded hydrophilic catalyst TiO2-Al2O3The high specific surface area hydrophilic regular packing has a specific surface area of 2500m2/m3Regular hydrophilic photocatalyst packing of 0.4m3The bulk density of the hydrophilic packing with high specific surface area is 320-650 kg/m3The void ratio is 70-90%, the F factor is 1.5-3.5, the wave pitch is 10-55 mm, and the tooth form angle is 30-80; fresh seawater is pumped into the washing tower through a seawater pump, in the embodiment, the marine diesel engine adopts a 4R32E model diesel engine manufactured by Van Ceylon, the power is 1620kW, the stroke number is 4, the fuel type is HFO, the sulfur content is 3.5%, and the total smoke gas amount is 3876m3/h，SO2The concentration is 2420mg/m3。
And S2, injecting the flue gas into the lower part of the washing tower, and carrying out countercurrent contact on the flue gas, the seawater and the hydrophilic filler with high specific surface area in the washing tower to carry out desulfurization reaction so as to obtain the waste seawater and the clean flue gas.
Specifically, flue gas discharged by the diesel engine is injected into the washing tower through the lower part of the washing tower, the flue gas is in countercurrent contact with seawater and hydrophilic filler with high specific surface area in the washing tower to carry out desulfurization reaction, and the oxidation action of a catalyst on the surface of the filler enables SO in the flue gas2Quickly oxidized into SO with stronger polarity and easier absorption by seawater3Obtaining waste seawater and clean flue gas, and having high desulfurization efficiency on the flue gas of the marine diesel engine with high sulfur content by utilizing the natural alkalinity of the seawater and the high gas-liquid mass transfer efficiency of the hydrophilic regular catalytic packing with high specific surface area; the waste seawater is also used for cooling the flue gas, and the temperature of the flue gas is adjusted by adjusting the volume of the waste seawater, in this embodiment, the temperature of the flue gas at the lower part of the washing tower is 80 ℃, and the temperature of the flue gas in the washing tower, which is in contact with the hydrophilic filler with the high specific surface area, is 60 ℃.
And S3, discharging the waste seawater through the bottom of the washing tower, and discharging the clean flue gas through the top of the washing tower.
Specifically, the unstable sulfite content in the desulfurized acidic wastewater seawater is greatly reduced, the COD is reduced, the desulfurized acidic wastewater seawater is discharged into the ocean through a bottom pipeline of the washing tower, and the desulfurized clean flue gas is discharged through the top of the washing tower.
The temperature of the seawater entering the tower is 15-30 ℃, and the spraying amount of the seawater is 17m respectively3/h、19m3/h、21m3/h、23m3H and 25m3H, respectively corresponding to liquid-gas ratios of 4.4L/Nm3, 4.9L/Nm3, 5.4L/Nm3, 5.9L/Nm3 and 6.4L/Nm3, and testing the removal of SO from the flue gas of the marine diesel engine2The reaction results of (A) are shown in Table 1.
TABLE 1 high specific surface area hydrophilic regular catalytic packing for seawater SO removal2Removal rate of
| Experimental number | Amount of seawater sprayed (m)3/h) | Liquid-gas ratio (L/Nm3) | SO2Removal Rate (%) |
| 1 | 17 | 4.4 | 90 |
| 2 | 19 | 4.9 | 92 |
| 3 | 21 | 5.4 | 94 |
| 4 | 23 | 5.9 | 97 |
| 5 | 25 | 6.4 | 99 |
Therefore, when the liquid-gas ratio is 6.4L/Nm3, the desulfurization rate of the high-specific-surface-area hydrophilic regular catalytic packing seawater can reach 99%, 36% of spraying water amount is saved compared with the traditional packing liquid-gas ratio of 10L/Nm3, and the power, the equipment weight and the floor area of the seawater pump are effectively reduced.
Example 2
The rest is the same as example 1, except that: the fixed seawater spraying amount is 25m3The corresponding liquid-gas ratio is 6.4L/Nm3, and the pressure drop of the bed layer of the washing tower and the SO removal of the flue gas of the marine diesel engine from the seawater are tested by changing the operating temperature of the seawater washing tower2The reaction results of (A) are shown in Table 2.
TABLE 2 scrubbing tower pressure drop and seawater SO removal2Removal rate of
| Experimental number | Temperature (. degree.C.) | Scrubber pressure drop (Pa) | SO2Removal Rate (%) |
| 1 | 30 | 2199 | 99 |
| 2 | 40 | 208 | 99 |
| 3 | 50 | 209 | 99 |
| 4 | 60 | 211 | 99 |
| 5 | 70 | 199 | 99 |
Therefore, the seawater desulfurization rate of the high-specific surface area hydrophilic regular catalytic packing can reach 99% at different temperatures, and the desulfurization effect is obvious. Meanwhile, the pressure drop of the bed layer of the washing tower is low and is only about 200Pa, and the flue gas discharged from the ship flue gas chimney cannot be influenced.
Example 3
The rest is the same as the example 2, except that: the filling volumes of the high specific surface area hydrophilic regular catalytic packing are respectively changed to be 0.3m3、0.4m3、0.5m3And 0.6m3Respectively corresponding to the airspeed of 12920h-1、9690h-1、7752h-1And 6460h-1Testing seawater removal of SO from flue gas of marine diesel engine2The reaction results of (A) are shown in Table 3.
TABLE 3 high specific surface area hydrophilic regular catalytic packing volume and removal of SO from seawater2Removal rate of
| Experimental number | Filling volume (m)3) | Acid seawater cleaning time (h)-1) | SO2Removal Rate (%) |
| 1 | 0.3 | 12920 | 92 |
| 2 | 0.4 | 9690 | 99 |
| 3 | 0.5 | 7752 | 99 |
| 4 | 0.6 | 6460 | 99 |
From this, it is found that the desulfurization rate is decreased with the increase of the acid seawater washing time.
Referring to fig. 2, a schematic structural diagram of a marine flue gas and seawater desulfurization system with a high specific surface area according to an embodiment of the present application is shown, for convenience of description, only the parts related to the embodiment are shown, and detailed description is as follows:
the second aspect of the embodiment of the application provides a high specific surface area boats and ships flue gas sea water desulfurization system, including scrubbing tower 1, the inside of scrubbing tower 1 is equipped with the hydrophilic filler 2 of high specific surface area, and the lower part of scrubbing tower 1 is equipped with flue gas entry 3, and the top of scrubbing tower is equipped with exhanst gas outlet 4, and the upper portion of scrubbing tower is equipped with sea water spray set 5, and the bottom of scrubbing tower is equipped with sea water outlet 6.
Specifically, the washing tower 1 is a rectangular tower or a circular tower, which can be determined according to the ship east requirement and the ship installation space, in this embodiment, the washing tower 1 is a rectangular tower, the length × width × height is 800 × 400 × 6000, the washing tower 1 is made of "explosion welding titanium composite material", the outer plate surface of the washing tower 1 is made of carbon steel, the manufacturing cost of the washing tower can be effectively reduced, the inner plate surface of the washing tower 1 is made of titanium, the seawater corrosion can be effectively prevented, and both the inner plate surface and the outer plate surface of the washing tower 1 can be made of titanium.
Sea water spray set 5 is connected with sea water pump 8 through sea water pipeline 7, sea water pump 8 is located in ocean 9, sea water pump 8 squeezes the sea water in ocean 9 into sea water spray set 5 through sea water pipeline 7, spray the sea water to scrubbing tower 1 inside through sea water spray set 5, flue gas that sulphur boats and ships diesel engine exhaust gets into the lower part of scrubbing tower 1 through flue gas entry 3, flue gas and sea water and the hydrophilic filler 2 of high specific surface area contact in the inside adverse current of scrubbing tower 1, carry out the desulfurization reaction, sour useless sea water after the desulfurization discharges into ocean 9 through sea water export 6, useless sea water still is used for cooling the flue gas, adjust the temperature of flue gas through adjusting the volume of useless sea water, clean flue gas after the desulfurization discharges through flue gas export 4 at scrubbing tower 1 top.
In conclusion, the invention provides a seawater desulfurization process and system for ship flue gas with high specific surface area, and the specific surface area is up to 2500m2/m3The hydrophilic regular catalytic filler has the characteristics of fast mass transfer, good wettability, catalytic oxidation activity, small pressure drop, large flux, seawater corrosion resistance, long service life, small operation liquid and gas and the like; the surface of a filler with high specific surface area is coated with a catalyst TiO2-Al2O3Can easily make SO in flue gas2Is catalytically oxidized into SO3The method has the advantages of reducing the content of sulfite entering the aeration tank from the source, improving the content of sulfate radicals, reducing the COD value of the desulfurized seawater, obviously reducing the area and the volume of the aeration tank in engineering, reducing the aeration quantity of air and reducing the mixing quantity of fresh seawater, thereby obviously reducing the construction cost.
Various embodiments are described herein for various devices, circuits, apparatuses, systems, and/or methods. Numerous specific details are set forth in order to provide a thorough understanding of the overall structure, function, manufacture, and use of the embodiments as described in the specification and illustrated in the accompanying drawings. However, it will be understood by those skilled in the art that the embodiments may be practiced without such specific details. In other instances, well-known operations, components and elements have been described in detail so as not to obscure the embodiments in the description. It will be appreciated by those of ordinary skill in the art that the embodiments herein and shown are non-limiting examples, and thus, it can be appreciated that the specific structural and functional details disclosed herein may be representative and do not necessarily limit the scope of the embodiments.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present application and are intended to be included within the scope of the present application.
Claims (9)
1. A seawater desulfurization process for ship flue gas with high specific surface area is used for desulfurization treatment of flue gas discharged by a sulfur-containing ship diesel engine, and is characterized by comprising the following steps:
s1, filling a high-specific-surface-area hydrophilic filler into the washing tower, and spraying seawater into the washing tower from the upper part of the washing tower;
s2, injecting flue gas into the lower part of the washing tower, wherein the flue gas is in countercurrent contact with the seawater and the hydrophilic filler with the high specific surface area in the washing tower to perform a desulfurization reaction, so that waste seawater and clean flue gas are obtained;
s3, discharging the waste seawater through the bottom of the washing tower, and discharging the clean flue gas through the top of the washing tower.
2. The seawater desulfurization process for marine flue gas with high specific surface area of claim 1, wherein the effluent seawater in S2 is further used for cooling the flue gas, and the temperature of the flue gas is adjusted by adjusting the volume of the effluent seawater.
3. The seawater desulfurization process for the marine flue gas with high specific surface area as claimed in claim 2, wherein the flue gas temperature at the lower part of the scrubber is 80 ℃, and the flue gas temperature in the scrubber contacting with the hydrophilic filler with high specific surface area is 60 ℃.
4. The marine flue gas seawater desulfurization process of claim 1, wherein the high specific surface area hydrophilic packing is a structured packing surface-coated catalyst composite, and the specific surface area thereof is 2500m2/m3Bulk density of 320-650 kg/m3The void ratio is 70-90%, the F factor is 1.5-3.5, the wave pitch is 10-55 mm, and the tooth form angle is 30-80.
5. The marine flue gas seawater desulfurization process with high specific surface area of claim 4, wherein the active ingredient of the catalyst is TiO2-Al2O3。
6. The utility model provides a high specific surface area boats and ships flue gas sea water desulfurization system, includes the scrubbing tower, its characterized in that, the inside of scrubbing tower is equipped with the hydrophilic filler of high specific surface area, the lower part of scrubbing tower is equipped with the flue gas entry, the top of scrubbing tower is equipped with the exhanst gas outlet, the upper portion of scrubbing tower is equipped with sea water spray set, the bottom of scrubbing tower is equipped with the sea water export.
7. The high-specific-surface-area marine flue gas seawater desulfurization system of claim 6, wherein the seawater spraying device is connected with a seawater pump through a seawater pipeline, and the seawater pump is arranged in the sea.
8. The marine flue gas seawater desulfurization system with high specific surface area of claim 6, wherein the outer plate surface of the scrubber tower is made of carbon steel, and the inner plate surface of the scrubber tower is made of titanium.
9. The marine seawater desulfurization system for flue gas of high specific surface area as claimed in claim 6, wherein the scrubber tower is a rectangular tower or a circular tower.
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