CN111632494A - Desulfurization and denitrification system based on electrolyzed seawater and process thereof - Google Patents
Desulfurization and denitrification system based on electrolyzed seawater and process thereof Download PDFInfo
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- CN111632494A CN111632494A CN202010459275.7A CN202010459275A CN111632494A CN 111632494 A CN111632494 A CN 111632494A CN 202010459275 A CN202010459275 A CN 202010459275A CN 111632494 A CN111632494 A CN 111632494A
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- B01D53/34—Chemical or biological purification of waste gases
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
- B01D53/50—Sulfur oxides
- B01D53/507—Sulfur oxides by treating the gases with other liquids
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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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
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Abstract
The invention discloses a desulfurization and denitrification system based on electrolytic seawater and a process thereof.A flue gas outlet is formed in the top of a tower body, a liquid discharge pipe is arranged at the bottom of the tower body, and the interior of the tower body is horizontally divided into a gas collection section, a gas-gas heat exchange section, a denitrification section and a desulfurization section from top to bottom; a flue gas pipeline is arranged at the upper position inside the tower body, is arranged between the gas collection section and the gas-gas heat exchange section, and extends out of the tower body from the open end of the flue gas pipeline; a plurality of needle-shaped plate type devices are horizontally arranged in the middle of the interior of the tower body at intervals, the needle-shaped plate type devices are vertically and longitudinally arranged, the upper ends of the needle-shaped plate type devices are respectively communicated with the flue gas pipeline in a sealing manner, and the needle-shaped plate type devices penetrate through the area surrounded by the gas-gas heat exchange section, the denitration section and the desulfurization section; a plurality of first spraying layers are horizontally arranged in the desulfurization section at intervals up and down, and a plurality of second spraying layers are horizontally arranged in the denitration section at intervals up and down. The invention has simple structure and energy saving, realizes the integrated treatment of desulfurization and denitrification and improves the desulfurization and denitrification efficiency.
Description
Technical Field
The invention relates to the technical field of waste gas treatment, in particular to a desulfurization and denitrification system based on electrolytic seawater and a process thereof.
Background
According to statistics, the air pollution caused by the exhaust emission of the marine diesel engine accounts for about 5-10% of the whole air pollution in the global range, and even reaches 30-40% in port cities; with the increasing global sea traffic, this will undoubtedly increase the environmental pollution proportion of coastal cities significantly; to date, the speed of improvement of environmental protection measures for ships has not kept pace with the speed of increase of marine traffic; therefore, how to effectively control the exhaust emission in the ship transportation process has become a focus of attention of all countries.
In order to enhance the protection of marine ecological environment, the international maritime organization sets a series of ship pollution prevention rules to limit the emission of ship tail gas. The Tier III standard has increased control limits for sulfides and nitrates, placing more stringent requirements on the relevant industries.
The pH value of the natural seawater is 7.8-8.5 usually, the alkalinity is about 2.2-2.7 mol/L, and the seawater has natural alkalinity and acid-base buffering capacity due to the fact that a certain amount of soluble carbonate is contained, a ship sailing in the sea in the process of contacting the seawater with the flue gas washes the flue gas by using the alkalinity of the natural seawater to desulfurize and denitrate, the flue gas containing oxysulfide and oxynitride is fully contacted and mixed through multi-layer spraying seawater countercurrent, the oxysulfide and oxynitride in the flue gas are absorbed by the spraying seawater, the ship runs in the sea, inexhaustible seawater is used, the situation that the alkalinity of the seawater in the sea area is reduced due to long-term use is not worried, and the seawater desalting device has natural geographical advantages compared with oil refineries, power plants and the like on the.
However, the traditional seawater desulfurization and denitrification equipment needs to be vertically installed, has the height of several meters or even tens of meters, and cannot bump, and is difficult to provide installation space and conditions for ships and offshore operation platforms; the conventional spray empty tower has the defects of smooth and uneven smoke, low spray density and strength per unit area and easy occurrenceShort circuit of flue gas, resulting in high liquid-gas ratio and SO2The absorption efficiency is low, be difficult to promote higher SOx/NOx control efficiency and the operation power consumption is higher, because high temperature flue gas directly reacts with the sea water, salt-out phenomenon and thermal stress corrosion produce easily simultaneously. Therefore, the above problems need to be solved.
Disclosure of Invention
The invention aims to provide a desulfurization and denitrification system based on electrolytic seawater and a process thereof, which are simple in structure, energy-saving, capable of realizing integrated treatment of desulfurization and denitrification and capable of improving desulfurization and denitrification efficiency.
In order to solve the technical problems, the invention adopts the following technical scheme: the invention discloses a desulfurization and denitrification system based on electrolyzed seawater, which has the innovation points that: comprises a tower body, a flue gas pipeline, a needle plate type device, a first spraying layer and a second spraying layer; a flue gas outlet is communicated and arranged at the middle position of the top of the tower body, a liquid discharge pipe is vertically communicated and arranged on one side of the bottom of the tower body, and the interior of the tower body is horizontally divided into a gas collection section, a gas-gas heat exchange section, a denitration section and a desulfurization section from top to bottom in sequence; a flue gas pipeline with an open end is horizontally and transversely arranged at the upper position inside the tower body, the flue gas pipeline is arranged between the gas collection section and the gas-gas heat exchange section, and the open end of the flue gas pipeline vertically extends out of the tower body and is fixedly connected with the tower body in a sealing way; a plurality of needle-shaped plate type devices are further horizontally arranged in the middle of the interior of the tower body at intervals, each needle-shaped plate type device is vertically and longitudinally arranged, the front side surface and the rear side surface of each needle-shaped plate type device are fixedly connected with the inner side wall of the tower body in a sealing mode respectively, each needle-shaped plate type device penetrates through the area defined by the gas-gas heat exchange section, the denitration section and the desulfuration section, the upper end of each needle-shaped plate type device is communicated with the flue gas pipeline in a sealing mode respectively, and the lower end of each needle-shaped plate type; a plurality of first spraying layers are horizontally arranged in the desulfurization section at intervals up and down, and a plurality of second spraying layers are horizontally arranged in the denitration section at intervals up and down.
Preferably, a plurality of first spraying pipes are further horizontally arranged in each first spraying layer at intervals, each first spraying pipe is horizontally and longitudinally arranged between the adjacent needle-shaped plate type devices, the output end of each first spraying pipe is vertically and downwards arranged, and the input end of each first spraying pipe vertically extends out of the tower body; and a plurality of second spraying pipes are horizontally arranged in each second spraying layer at intervals, each second spraying pipe is horizontally and longitudinally arranged between the adjacent needle-shaped plate type devices, the output end of each second spraying pipe is vertically and downwards arranged, and the input end of each second spraying pipe vertically extends out of the tower body.
Preferably, each needle-shaped plate type device comprises a cooling channel and a heat-conducting roller; each cooling channel is of a hollow cuboid structure formed by splicing heat exchange plates, is vertically and longitudinally arranged, and is open at the upper end and the lower end; the upper end of each cooling channel is vertically and hermetically communicated with the flue gas pipeline, and the lower end of each cooling channel is not contacted with the inner bottom surface of the tower body; the front side surface and the rear side surface of each cooling channel are respectively and fixedly connected with the inner side wall of the tower body in a sealing manner, and the lower end of each cooling channel is also respectively provided with a plurality of triangular supports which are respectively hung in the tower body through the triangular supports; a plurality of heat-conducting rollers are uniformly distributed in a matrix from top to bottom in each descending channel at intervals, each heat-conducting roller comprises a roller body and pins, the two ends of each roller body are respectively led out pins with the diameter smaller than that of the roller body, and the two pins are integrally formed; the roller bodies of the heat-conducting rollers are horizontally and transversely arranged in the corresponding descending channels, and two pins of the heat-conducting rollers vertically extend out of the corresponding descending channels respectively and are fixedly connected with the corresponding descending channels in a sealing mode.
Preferably, a sea water desalting device, a power supply, an electrolytic cell, an oxidizing liquid pool and an alkaline solution pool are sequentially arranged on one side of the tower body at intervals, the output end of the sea water desalting device is hermetically communicated with the input end of the electrolytic cell, and the output end of the electrolytic cell is hermetically communicated with the input end of the oxidizing liquid pool and the input end of the alkaline solution pool respectively; the power supply is electrically connected with the electrolytic cell, and the desalinated seawater in the electrolytic cell is electrolyzed into oxidizing liquid and alkaline liquid which respectively flow into the oxidizing liquid pool and the alkaline solution pool to be stored; the input end of each first spraying pipe is respectively communicated with the output end of the oxidizing liquid pool in a sealing mode, and the input end of each second spraying pipe is respectively communicated with the output end of the alkaline solution pool in a sealing mode.
Preferably, the oil contamination impurity discharge pipe and the first sealing cover are further included; greasy dirt impurity delivery pipe is vertical to be located the opposite side of tower body bottom, and with the inside seal intercommunication of tower body the lower extreme of greasy dirt impurity delivery pipe still cup joints and is equipped with first sealed lid, first sealed lid with greasy dirt impurity delivery pipe phase-match, and sealed spiro union between the two.
Preferably, the lower end of the liquid discharge pipe is further sleeved with a second sealing cover, the second sealing cover is matched with the liquid discharge pipe, and the second sealing cover and the liquid discharge pipe are in sealing threaded connection; the liquid discharge pipe is further fixedly sleeved with an electromagnetic valve, and the electromagnetic valve is arranged between the second sealing cover and the bottom of the tower body.
Preferably, a guide plate is obliquely arranged on the inner bottom surface of the tower body, and the inclination angle of the guide plate is 2-5 degrees; the lower end of the guide plate is tightly abutted against the upper end port of the liquid discharge pipe in a sealing manner, and the upper end of the guide plate extends out of the tower body in an inclined manner towards the direction of the oil and dirt discharge pipe; the upper end of guide plate with the embedding junction of tower body still is equipped with the sealing washer, the sealing washer be with guide plate assorted cavity cuboid structure, and with the embedded fixed connection of tower body.
Preferably, limiting plates are symmetrically arranged on the upper side and the lower side of the part, exceeding the tower body, of the guide plate, each limiting plate is of an obliquely arranged rectangular structure, the inclination angle of each limiting plate is consistent with that of the guide plate, and the limiting plates are respectively fixedly connected with the outer side wall of the tower body; and a pin shaft is vertically arranged in the middle of the upper surface of the upper limiting plate, and the lower end of the pin shaft vertically and downwards sequentially penetrates through the upper limiting plate, the guide plate and the lower limiting plate and limits the guide plate in the horizontal direction.
Preferably, the device also comprises a slag scraping plate and a hinge; the upper end of guide plate with the inside wall junction of tower body still is equipped with the scum board, the scum board is the rectangle structure, and its one side along respectively through the hinge with the inside wall of tower body rotates to be connected, the opposite side border overlap joint of scum board is in on the upper surface of guide plate.
The invention discloses a process of a desulfurization and denitrification system based on electrolytic seawater, which is characterized by comprising the following steps:
(1) injecting the desalinated seawater treated by the seawater desalination device into an electrolytic tank for electrolysis, generating oxidizing liquid at an anode and flowing into the oxidizing liquid tank for storage, and generating alkaline liquid at a cathode and flowing into an alkaline solution tank for storage;
(2) the high-temperature flue gas enters the interior of each needle-shaped plate type device through the flue gas pipeline, is subjected to heat conduction through the heat exchange plate and the heat conduction roller of the cooling channel and transfers the heat to the exterior of the needle-shaped plate type device, and the temperature of the high-temperature flue gas in the needle-shaped plate type device is reduced due to the conduction of the heat;
(3) the cooled flue gas continuously descends to enter a denitration section, a second spray pipe in the denitration section sprays alkaline liquid to the outer wall of the needle-shaped plate type device in a liquid drop mode, a layer of water film is formed on the outer surface of the needle-shaped plate type device, and the flue gas in the needle-shaped plate type device is further cooled;
(4) the flue gas after further cooling continues to descend to enter a desulfurization section, a first spray pipe in the desulfurization section continuously sprays oxidizing liquid to the outer wall of the needle-shaped plate type device in a liquid drop mode, a layer of water film is formed on the outer surface of the needle-shaped plate type device, and the flue gas in the needle-shaped plate type device is cooled again; then the flue gas begins to rise after coming out from the bottom of the needle-shaped plate type device, contacts with the oxidizing liquid and carries out desulfurization reaction; the desulfurized flue gas continuously rises to enter a denitration section, and is contacted with alkaline liquid to carry out denitration reaction, so that low-temperature clean flue gas is formed;
(5) after the desulfurization and denitrification reaction, the waste liquid is collected to the upper end port of the liquid discharge pipe through the guide plate and is discharged through the liquid discharge pipe, and oil contamination impurities are attached to the guide plate;
(6) the low-temperature clean flue gas continuously rises to enter the gas-gas heat exchange section, and is subjected to heat transfer through the dividing wall of the high-temperature flue gas in the needle-shaped plate type device, so that liquid drops in the low-temperature clean flue gas are evaporated and the temperature is raised, and then the low-temperature clean flue gas continuously rises to enter the gas collection section and is discharged through the flue gas outlet;
(7) after the desulfurization and denitrification reaction is finished, the pin shaft is pulled out, the guide plate is taken out outwards to be separated from the tower body, meanwhile, the oil contamination impurities on the guide plate are cleaned by the slag scraping plate, and finally, the oil contamination impurities are discharged from the oil contamination impurity discharge pipe.
The invention has the beneficial effects that:
(1) the invention realizes the integrated treatment of desulfurization and denitrification, reduces the occupied space, improves the space utilization rate and improves the desulfurization and denitrification efficiency;
(2) according to the invention, the roller body of the heat-conducting roller is arranged in the cooling channel, and the pins of the heat-conducting roller extend out of the cooling channel; when high-temperature flue gas enters the needle-shaped plate type device and contacts with the inner side wall of the cooling channel and the roller body of the heat-conducting roller, the heat exchange area is increased, the heat transfer coefficient is increased, heat conduction is carried out through the pins of the heat-conducting roller, and the heat transfer effect is better; meanwhile, the heat conducting roller has small volume and good heat conducting effect, so that the needle-shaped plate type device has small volume, thereby reducing the occupied space of the device;
(3) the high-temperature flue gas enters the needle-shaped plate type device, is subjected to preliminary cooling in the gas-gas heat exchange section, and then is subjected to cooling in the denitration section and the desulfurization section respectively by the first spray pipe and the second spray pipe, so that the high-temperature flue gas in the needle-shaped plate type device is further cooled; the needle-shaped plate type device is used for cooling the high-temperature flue gas in multiple sections, so that the high-temperature flue gas is prevented from directly contacting seawater, the salting-out phenomenon is reduced, the thermal stress corrosion is reduced, and the service life of the device is prolonged;
(4) according to the invention, low-temperature clean flue gas generated after desulfurization and denitrification enters the gas-gas heat exchange section, and heat is transferred through the dividing wall of high-temperature flue gas in the needle-shaped plate type device, so that liquid drops in the clean flue gas are evaporated and the temperature is raised, and the clean flue gas is further promoted to rise and enter the gas collection section, and no heating device is required to be additionally arranged in the process, so that the energy consumption of a system is reduced, and the operation cost is reduced;
(5) according to the invention, the first spray pipe and the second spray pipe respectively cool the outer wall of the needle-shaped plate type device, so that the heat conduction of high-temperature flue gas in the needle-shaped plate type device is facilitated; meanwhile, the first spraying pipe and the second spraying pipe respectively carry out desulfurization and denitrification on the cooled flue gas, so that the desulfurization and denitrification efficiency is improved;
(6) the guide plate and the slag scraping plate are matched for use, so that waste liquid and oil stain impurities can be separately discharged, the labor intensity is reduced, and the working efficiency is improved;
(7) the invention adopts the mode of electrolyzing seawater to carry out desulfurization and denitrification, has low cost and good economic benefit, and the treated wastes are all pollutant-free and can be discharged into the ocean without causing pollution.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments are briefly described below, and it is obvious that the drawings in the following description are only some embodiments described in the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a desulfurization and denitrification system based on electrolyzed seawater according to the present invention.
Fig. 2 is a schematic structural view of the needle-shaped plate type device in fig. 1.
FIG. 3 is a schematic view of the heat-conducting roll of FIG. 2.
Wherein, 1-tower body; 2-a gas collection section; 3-gas heat exchange section; 4-a denitration section; 5-a desulfurization section; 6-needle plate type device; 7-triangular brackets; 8-flue gas pipeline; 9-a first shower; 10-a second spray pipe; 11-a flow guide plate; 12-a hinge; 13-a scraper; 14-a pin shaft; 15-limiting plate; 16-a sealing ring; 17-a flue gas outlet; 18-oil contamination impurity discharge pipe; 19-a first sealing cover; 20-liquid discharge pipe; 21-a second sealing cover; 22-a solenoid valve; 23-an oxidation liquid pool; 24-an alkaline solution tank; 25-an electrolytic cell; 26-a power supply; 27-a seawater desalination plant; 61-a cooling channel; 62-heat conducting rollers; 621-a roller body; 622-Pin.
Detailed Description
The technical solution of the present invention will be clearly and completely described by the following detailed description.
The invention discloses a desulfurization and denitrification system based on electrolyzed seawater, which comprises a tower body 1, a flue gas pipeline 8, a needle-shaped plate type device 6, a first spraying layer and a second spraying layer; the specific structure is as shown in figure 1, a flue gas outlet 17 is communicated and arranged at the middle position of the top of the tower body 1, and a liquid discharge pipe 20 is vertically communicated and arranged at one side of the bottom of the tower body; the lower end of the liquid discharge pipe 20 is also sleeved with a second sealing cover 21, the second sealing cover 21 is matched with the liquid discharge pipe 20, and the second sealing cover and the liquid discharge pipe 20 are in sealing threaded connection; an electromagnetic valve 22 is further fixedly sleeved on the liquid discharge pipe 20, and the electromagnetic valve 22 is arranged between the second sealing cover 21 and the bottom of the tower body 1 and used for controlling the discharge of waste liquid.
The invention horizontally divides the interior of a tower body 1 into a gas collection section 2, a gas-gas heat exchange section 3, a denitration section 4 and a desulfurization section 5 from top to bottom in sequence; as shown in fig. 1, a flue gas pipe 8 with an open end is horizontally and transversely arranged at an upper position inside the tower body 1, the flue gas pipe 8 is arranged between the gas collection section 2 and the gas-gas heat exchange section 3, and the open end of the flue gas pipe vertically extends out of the tower body 1 and is fixedly connected with the tower body 1 in a sealing manner.
In the invention, a plurality of needle-shaped plate type devices 6 are sequentially arranged in the middle position in the tower body 1 at horizontal intervals, and each needle-shaped plate type device 6 comprises a cooling channel 61 and a heat conducting roller 62; as shown in fig. 1 to 3, each cooling channel 61 is a hollow rectangular structure formed by splicing heat exchange plates, and is vertically and longitudinally arranged, and the upper end and the lower end of the cooling channel are open; the upper end of each cooling channel 61 is vertically and hermetically communicated with the flue gas pipeline 8, and the lower end of each cooling channel is not contacted with the inner bottom surface of the tower body 1; the front side surface and the rear side surface of each cooling channel 61 are respectively and fixedly connected with the inner side wall of the tower body 1 in a sealing way, and the lower end of each cooling channel is also respectively provided with a plurality of triangular supports 7 which are respectively hung in the tower body 1 through the triangular supports 7; wherein, each cooling channel 61 penetrates and is distributed in the area surrounded by the gas-gas heat exchange section 3, the denitration section 4 and the desulfuration section 5;
as shown in fig. 1 to 3, a plurality of heat conducting rollers 62 are uniformly arranged in each descending channel in a matrix from top to bottom at intervals, each heat conducting roller 62 comprises a roller body 621 and a pin 622, the pin 622 with the diameter smaller than that of the roller body 621 is respectively led out from two ends of each roller body 621, and the two are integrally formed; the roller body 621 of each heat-conducting roller 62 is horizontally and horizontally arranged in the corresponding descending channel, and two pins 622 of the heat-conducting roller respectively vertically extend out of the corresponding descending channels and are respectively fixedly connected with the corresponding descending channels in a sealing manner.
In the invention, a plurality of first spraying layers are horizontally arranged in the desulfurization section 5 at intervals up and down; as shown in fig. 1, a plurality of first spraying pipes 9 are further horizontally arranged in each first spraying layer at intervals, each first spraying pipe 9 is horizontally and longitudinally arranged between adjacent needle-shaped plate-type devices 6, the output end of each first spraying pipe is vertically arranged downwards, and the input end of each first spraying pipe vertically extends out of the tower body 1;
as shown in fig. 1, a plurality of second spraying layers are horizontally arranged in the denitration section 4 at intervals up and down, a plurality of second spraying pipes 10 are horizontally arranged in each second spraying layer at intervals, each second spraying pipe 10 is horizontally and longitudinally arranged between adjacent needle-shaped plate-type devices 6, the output end of each second spraying pipe is vertically arranged downwards, and the input end of each second spraying pipe vertically extends out of the tower body 1.
In the invention, a seawater desalination device 27, a power supply 26, an electrolytic cell 25, an oxidizing liquid pool 23 and an alkaline solution pool 24 are sequentially arranged at one side of the tower body 1 at intervals; as shown in fig. 1, the output end of the seawater desalination device 27 is in sealed communication with the input end of the electrolytic cell 25, and the output end of the electrolytic cell 25 is in sealed communication with the input end of the oxidizing liquid pool 23 and the input end of the alkaline solution pool 24, respectively; the power supply 26 is electrically connected with the electrolytic cell 25, and the desalinated seawater in the electrolytic cell 25 is electrolyzed into an oxidizing solution and an alkaline solution, and the oxidizing solution and the alkaline solution flow into the corresponding oxidizing solution pool 23 and the corresponding alkaline solution pool 24 respectively for storage; wherein, the input end of each first spray pipe 9 is respectively communicated with the output end of the oxidation liquid pool 23 in a sealing way, and the input end of each second spray pipe 10 is respectively communicated with the output end of the alkaline solution pool 24 in a sealing way.
The other side of the bottom of the tower body 1 is also vertically provided with an oil contamination impurity discharge pipe 18, and the oil contamination impurity discharge pipe 18 is hermetically communicated with the inside of the tower body 1; as shown in fig. 1, a first sealing cover 19 is further sleeved at the lower end of the oil contamination impurity discharge pipe 18, the first sealing cover 19 is matched with the oil contamination impurity discharge pipe 18, and the oil contamination impurity discharge pipe and the first sealing cover are in sealing threaded connection.
The invention also discloses a guide plate 11 obliquely arranged on the inner bottom surface of the tower body 1, and the inclination angle of the guide plate 11 is 2-5 degrees; as shown in fig. 1, the lower end of the guide plate 11 is tightly and hermetically abutted against the upper end port of the drain pipe 20, and the upper end of the guide plate slants upwards towards the direction of the oil and dirt discharge pipe 18 to extend out of the tower body 1, so that the waste liquid is concentrated at the drain pipe 20 and is convenient to discharge; wherein, still be equipped with sealing washer 16 in the upper end of guide plate 11 and the embedding junction of tower body 1, this sealing washer 16 be with guide plate 11 assorted hollow cuboid structure, and with the embedded fixed connection of tower body 1 to prevent that the waste liquid from flowing out tower body 1.
As shown in fig. 1, limiting plates 15 are symmetrically arranged on the upper side and the lower side of the part of the guide plate 11, which exceeds the tower body 1, each limiting plate 15 is of a rectangular structure which is obliquely arranged, the inclination angles of the limiting plates are consistent with the inclination angle of the guide plate 11, and the limiting plates are respectively fixedly connected with the outer side wall of the tower body 1; a pin shaft 14 is vertically arranged in the middle of the upper surface of the upper limiting plate 15, the lower end of the pin shaft 14 vertically and downwards sequentially penetrates through the upper limiting plate 15, the guide plate 11 and the lower limiting plate 15, and the guide plate 11 is limited in the horizontal direction.
As shown in fig. 1, a slag scraping plate 13 is further disposed at a joint between an upper end of the guide plate 11 and an inner side wall of the tower body 1, the slag scraping plate 13 is of a rectangular structure, one side edge of the slag scraping plate 13 is rotatably connected with the inner side wall of the tower body 1 through hinges 12, and the other side edge of the slag scraping plate 13 is lapped on an upper surface of the guide plate 11. According to the invention, the pin shaft 14 is pulled out, the guide plate 11 is taken out outwards to be separated from the tower body 1, the scraper plate 13 cleans oil contamination impurities on the guide plate 11, and after the guide plate 11 is taken out, the scraper plate 13 is attached to the inner side wall of the tower body 1 under the action of the hinge 12, so that waste liquid and oil contamination impurities are prevented from falling out.
The invention relates to a process of a desulfurization and denitrification system based on electrolytic seawater, which comprises the following steps:
(1) the desalinated seawater processed by the seawater desalination device 27 is injected into the electrolytic cell 25 for electrolysis, the anode generates an oxidizing solution and flows to the oxidizing solution pool 23 for storage, and the cathode generates an alkaline solution and flows to the alkaline solution pool 24 for storage;
(2) the high-temperature flue gas enters the interior of each needle-shaped plate type device 6 through the flue gas pipeline 8, is subjected to heat conduction through the heat exchange plate of the cooling channel 61 and the heat conduction roller 62, and transfers the heat to the exterior of the needle-shaped plate type device 6, and the temperature of the high-temperature flue gas in the needle-shaped plate type device 6 is reduced due to the heat conduction;
(3) the cooled flue gas continuously descends to enter the denitration section 4, the second spray pipe 10 in the denitration section 4 sprays alkaline liquid to the outer wall of the needle-shaped plate type device 6 in a liquid drop mode, and a layer of water film is formed on the outer surface of the needle-shaped plate type device 6, so that heat conduction is facilitated, and the flue gas in the needle-shaped plate type device 6 is further cooled;
(4) the flue gas after further temperature reduction continues to descend to enter the desulfurization section 5, the first spray pipe 9 in the desulfurization section 5 continuously sprays the oxidizing liquid to the outer wall of the needle-shaped plate type device 6 in a liquid drop mode, a layer of water film is formed on the outer surface of the needle-shaped plate type device 6, and the flue gas in the needle-shaped plate type device 6 is cooled again; then the flue gas begins to rise after coming out from the bottom of the needle-shaped plate type device 6, contacts with the oxidizing solution and carries out desulfurization reaction; the desulfurized flue gas continuously rises to enter a denitration section 4, and contacts with alkaline liquid to carry out denitration reaction, so that low-temperature clean flue gas is formed;
(5) after the desulfurization and denitrification reaction, the waste liquid is collected to the upper end port of the liquid discharge pipe 20 through the guide plate 11, the second sealing cover 21 and the electromagnetic valve 22 are opened, and then the waste liquid is discharged through the liquid discharge pipe 20; while the oil contamination impurities are attached to the guide plate 11;
(6) the low-temperature clean flue gas continuously rises to enter the gas-gas heat exchange section 3, and the liquid drops in the low-temperature clean flue gas are evaporated and the temperature is raised by transferring heat through the dividing wall of the high-temperature flue gas in the needle-shaped plate type device 6, so that the low-temperature clean flue gas continuously rises to enter the gas collection section 2 and is discharged through the flue gas outlet 17, and a heating device is not required to be additionally arranged in the process, so that the energy consumption of the system is reduced, and the operation cost is also reduced;
(7) after the desulfurization and denitrification reaction is finished, the pin shaft 14 is pulled out, the guide plate 11 is taken out outwards to be separated from the tower body 1, meanwhile, the oil contamination impurities on the guide plate 11 are cleaned by the scraper plate 13, and finally, the oil contamination impurities are discharged from the oil contamination impurity discharge pipe 18.
The invention has the beneficial effects that:
(1) the invention realizes the integrated treatment of desulfurization and denitrification, reduces the occupied space, improves the space utilization rate and improves the desulfurization and denitrification efficiency;
(2) in the invention, the roller body 621 of the heat-conducting roller 62 is arranged in the cooling channel 61, and the pin 622 of the heat-conducting roller extends out of the cooling channel 61; when the high-temperature flue gas enters the needle-shaped plate type device 6 and contacts with the inner side wall of the cooling channel 61 and the roller body 621 of the heat conducting roller 62, the heat exchange area is increased, the heat transfer coefficient is increased, heat conduction is carried out through the pins 622 of the heat conducting roller 62, and the heat transfer effect is better; meanwhile, the heat conducting roller 62 has small volume 621 and good heat conducting effect, so that the needle-shaped plate type device 6 has small volume, and the occupied space of the device is reduced;
(3) the high-temperature flue gas enters the needle-shaped plate type device 6, is subjected to preliminary cooling in the gas-gas heat exchange section 3, and then is subjected to cooling in the denitration section 4 and the desulfurization section 5, so that the high-temperature flue gas in the needle-shaped plate type device 6 is further cooled because the first spray pipes 9 and the second spray pipes 10 respectively cool the outer wall of the needle-shaped plate type device 6; the needle-shaped plate type device 6 is used for cooling the high-temperature flue gas in multiple sections, so that the high-temperature flue gas is prevented from directly contacting seawater, the salting-out phenomenon is reduced, the thermal stress corrosion is reduced, and the service life of the device is prolonged;
(4) according to the invention, low-temperature clean flue gas generated after desulfurization and denitrification enters the gas-gas heat exchange section 3, and is subjected to heat transfer through the dividing wall of high-temperature flue gas in the needle-shaped plate type device 6, so that liquid drops in the clean flue gas are evaporated and the temperature is raised, and the clean flue gas is further promoted to rise and enter the gas collection section 2, and a heating device is not required to be additionally arranged in the process, so that the energy consumption of a system is reduced, and the operation cost is reduced;
(5) according to the invention, the first spray pipe 9 and the second spray pipe 10 respectively cool the outer wall of the needle-shaped plate type device 6, so that the heat conduction of high-temperature flue gas in the needle-shaped plate type device 6 is facilitated; meanwhile, the first spraying pipe 9 and the second spraying pipe 10 respectively carry out desulfurization and denitrification on the cooled flue gas, so that the desulfurization and denitrification efficiency is improved;
(6) according to the invention, the guide plate 11 and the slag scraping plate 13 are used in a matched manner, so that waste liquid and oil stain impurities can be separately discharged, the labor intensity is reduced, and the working efficiency is improved;
(7) the invention adopts the mode of electrolyzing seawater to carry out desulfurization and denitrification, has low cost and good economic benefit, and the treated wastes are all pollutant-free and can be discharged into the ocean without causing pollution.
The above-mentioned embodiments are merely descriptions of the preferred embodiments of the present invention, and do not limit the concept and scope of the present invention, and various modifications and improvements made to the technical solutions of the present invention by those skilled in the art should fall into the protection scope of the present invention without departing from the design concept of the present invention, and the technical contents of the present invention as claimed are all described in the technical claims.
Claims (10)
1. The utility model provides a SOx/NOx control system based on electrolytic seawater which characterized in that: comprises a tower body, a flue gas pipeline, a needle plate type device, a first spraying layer and a second spraying layer; a flue gas outlet is communicated and arranged at the middle position of the top of the tower body, a liquid discharge pipe is vertically communicated and arranged on one side of the bottom of the tower body, and the interior of the tower body is horizontally divided into a gas collection section, a gas-gas heat exchange section, a denitration section and a desulfurization section from top to bottom in sequence; a flue gas pipeline with an open end is horizontally and transversely arranged at the upper position inside the tower body, the flue gas pipeline is arranged between the gas collection section and the gas-gas heat exchange section, and the open end of the flue gas pipeline vertically extends out of the tower body and is fixedly connected with the tower body in a sealing way; a plurality of needle-shaped plate type devices are further horizontally arranged in the middle of the interior of the tower body at intervals, each needle-shaped plate type device is vertically and longitudinally arranged, the front side surface and the rear side surface of each needle-shaped plate type device are fixedly connected with the inner side wall of the tower body in a sealing mode respectively, each needle-shaped plate type device penetrates through the area defined by the gas-gas heat exchange section, the denitration section and the desulfuration section, the upper end of each needle-shaped plate type device is communicated with the flue gas pipeline in a sealing mode respectively, and the lower end of each needle-shaped plate type; a plurality of first spraying layers are horizontally arranged in the desulfurization section at intervals up and down, and a plurality of second spraying layers are horizontally arranged in the denitration section at intervals up and down.
2. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 1, wherein: a plurality of first spraying pipes are further horizontally arranged in each first spraying layer at intervals, each first spraying pipe is horizontally and longitudinally arranged between the adjacent needle-shaped plate type devices, the output end of each first spraying pipe is vertically and downwards arranged, and the input end of each first spraying pipe vertically extends out of the tower body; and a plurality of second spraying pipes are horizontally arranged in each second spraying layer at intervals, each second spraying pipe is horizontally and longitudinally arranged between the adjacent needle-shaped plate type devices, the output end of each second spraying pipe is vertically and downwards arranged, and the input end of each second spraying pipe vertically extends out of the tower body.
3. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 1, wherein: each needle-shaped plate type device comprises a cooling channel and a heat conducting roller; each cooling channel is of a hollow cuboid structure formed by splicing heat exchange plates, is vertically and longitudinally arranged, and is open at the upper end and the lower end; the upper end of each cooling channel is vertically and hermetically communicated with the flue gas pipeline, and the lower end of each cooling channel is not contacted with the inner bottom surface of the tower body; the front side surface and the rear side surface of each cooling channel are respectively and fixedly connected with the inner side wall of the tower body in a sealing manner, and the lower end of each cooling channel is also respectively provided with a plurality of triangular supports which are respectively hung in the tower body through the triangular supports; a plurality of heat-conducting rollers are uniformly distributed in a matrix from top to bottom in each descending channel at intervals, each heat-conducting roller comprises a roller body and pins, the two ends of each roller body are respectively led out pins with the diameter smaller than that of the roller body, and the two pins are integrally formed; the roller bodies of the heat-conducting rollers are horizontally and transversely arranged in the corresponding descending channels, and two pins of the heat-conducting rollers vertically extend out of the corresponding descending channels respectively and are fixedly connected with the corresponding descending channels in a sealing mode.
4. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 2, wherein: a sea water desalting device, a power supply, an electrolytic cell, an oxidizing liquid pool and an alkaline solution pool are sequentially arranged on one side of the tower body at intervals, the output end of the sea water desalting device is hermetically communicated with the input end of the electrolytic cell, and the output end of the electrolytic cell is hermetically communicated with the input end of the oxidizing liquid pool and the input end of the alkaline solution pool respectively; the power supply is electrically connected with the electrolytic cell, and the desalinated seawater in the electrolytic cell is electrolyzed into oxidizing liquid and alkaline liquid which respectively flow into the oxidizing liquid pool and the alkaline solution pool to be stored; the input end of each first spraying pipe is respectively communicated with the output end of the oxidizing liquid pool in a sealing mode, and the input end of each second spraying pipe is respectively communicated with the output end of the alkaline solution pool in a sealing mode.
5. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 1, wherein: the oil contamination impurity discharging pipe and the first sealing cover are further included; greasy dirt impurity delivery pipe is vertical to be located the opposite side of tower body bottom, and with the inside seal intercommunication of tower body the lower extreme of greasy dirt impurity delivery pipe still cup joints and is equipped with first sealed lid, first sealed lid with greasy dirt impurity delivery pipe phase-match, and sealed spiro union between the two.
6. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 1, wherein: the lower end of the liquid discharge pipe is also sleeved with a second sealing cover, the second sealing cover is matched with the liquid discharge pipe, and the second sealing cover and the liquid discharge pipe are in sealing threaded connection; the liquid discharge pipe is further fixedly sleeved with an electromagnetic valve, and the electromagnetic valve is arranged between the second sealing cover and the bottom of the tower body.
7. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 1, wherein: a guide plate is obliquely arranged on the inner bottom surface of the tower body, and the inclination angle of the guide plate is 2-5 degrees; the lower end of the guide plate is tightly abutted against the upper end port of the liquid discharge pipe in a sealing manner, and the upper end of the guide plate extends out of the tower body in an inclined manner towards the direction of the oil and dirt discharge pipe; the upper end of guide plate with the embedding junction of tower body still is equipped with the sealing washer, the sealing washer be with guide plate assorted cavity cuboid structure, and with the embedded fixed connection of tower body.
8. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 7, wherein: limiting plates are symmetrically arranged on the upper side and the lower side of the part, exceeding the tower body, of the guide plate, each limiting plate is of a rectangular structure which is obliquely arranged, the inclination angle of each limiting plate is consistent with that of the guide plate, and the limiting plates are respectively fixedly connected with the outer side wall of the tower body; and a pin shaft is vertically arranged in the middle of the upper surface of the upper limiting plate, and the lower end of the pin shaft vertically and downwards sequentially penetrates through the upper limiting plate, the guide plate and the lower limiting plate and limits the guide plate in the horizontal direction.
9. The desulfurization and denitrification system based on the electrolyzed seawater as claimed in claim 1, wherein: the device also comprises a slag scraping plate and a hinge; the upper end of guide plate with the inside wall junction of tower body still is equipped with the scum board, the scum board is the rectangle structure, and its one side along respectively through the hinge with the inside wall of tower body rotates to be connected, the opposite side border overlap joint of scum board is in on the upper surface of guide plate.
10. A process of a desulfurization and denitrification system based on electrolyzed seawater is characterized by comprising the following steps:
(1) injecting the desalinated seawater treated by the seawater desalination device into an electrolytic tank for electrolysis, generating oxidizing liquid at an anode and flowing into the oxidizing liquid tank for storage, and generating alkaline liquid at a cathode and flowing into an alkaline solution tank for storage;
(2) the high-temperature flue gas enters the interior of each needle-shaped plate type device through the flue gas pipeline, is subjected to heat conduction through the heat exchange plate and the heat conduction roller of the cooling channel and transfers the heat to the exterior of the needle-shaped plate type device, and the temperature of the high-temperature flue gas in the needle-shaped plate type device is reduced due to the conduction of the heat;
(3) the cooled flue gas continuously descends to enter a denitration section, a second spray pipe in the denitration section sprays alkaline liquid to the outer wall of the needle-shaped plate type device in a liquid drop mode, a layer of water film is formed on the outer surface of the needle-shaped plate type device, and the flue gas in the needle-shaped plate type device is further cooled;
(4) the flue gas after further cooling continues to descend to enter a desulfurization section, a first spray pipe in the desulfurization section continuously sprays oxidizing liquid to the outer wall of the needle-shaped plate type device in a liquid drop mode, a layer of water film is formed on the outer surface of the needle-shaped plate type device, and the flue gas in the needle-shaped plate type device is cooled again; then the flue gas begins to rise after coming out from the bottom of the needle-shaped plate type device, contacts with the oxidizing liquid and carries out desulfurization reaction; the desulfurized flue gas continuously rises to enter a denitration section, and is contacted with alkaline liquid to carry out denitration reaction, so that low-temperature clean flue gas is formed;
(5) after the desulfurization and denitrification reaction, the waste liquid is collected to the upper end port of the liquid discharge pipe through the guide plate and is discharged through the liquid discharge pipe, and oil contamination impurities are attached to the guide plate;
(6) the low-temperature clean flue gas continuously rises to enter the gas-gas heat exchange section, and is subjected to heat transfer through the dividing wall of the high-temperature flue gas in the needle-shaped plate type device, so that liquid drops in the low-temperature clean flue gas are evaporated and the temperature is raised, and then the low-temperature clean flue gas continuously rises to enter the gas collection section and is discharged through the flue gas outlet;
(7) after the desulfurization and denitrification reaction is finished, the pin shaft is pulled out, the guide plate is taken out outwards to be separated from the tower body, meanwhile, the oil contamination impurities on the guide plate are cleaned by the slag scraping plate, and finally, the oil contamination impurities are discharged from the oil contamination impurity discharge pipe.
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