CN110841443B - Selective non-catalytic reduction flue gas denitration process - Google Patents
Selective non-catalytic reduction flue gas denitration process 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
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
- B01D53/56—Nitrogen oxides
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- B01D53/34—Chemical or biological purification of waste gases
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Abstract
The invention discloses a selective non-catalytic reduction flue gas denitration process, which comprises the steps of adding a denitration agent into a grinding shell of a denitration device, starting a driving motor to drive a rotating shaft to rotate, wherein the rotating shaft drives a bevel gear I to rotate, the bevel gear I is in meshed connection with a bevel gear II, the bevel gear drives a bevel gear II to rotate, the bevel gear II drives a rotating shaft II to rotate, and the rotating shaft II drives a rotating disc to rotate; the denitration agent is crushed into powder and then sprayed into the furnace body to react, so that the denitration agent can fully react, the utilization rate of the denitration agent is improved, and the reduction efficiency of the denitration agent powder to flue gas is improved; the phenomenon that the water-cooled wall is corroded to cause tube explosion is avoided, and the water-cooled wall is dissolved in water and needs to absorb heat, so that the water-cooled wall has certain corrosivity and recrystallization; the flue gas temperature at the injection point of the aqueous solution suddenly drops, so that nearby unburned carbon particles are extinguished, and the carbon content of fly ash and the coal consumption are increased.
Description
Technical Field
The invention relates to the technical field of flue gas denitration, and particularly relates to a selective non-catalytic reduction flue gas denitration process.
Background
Flue gas is one of the main emissions from thermal power plants and is produced by the combustion of combustibles in burners (i.e. boilers). Since flue gases typically contain large amounts of nitrogen oxides NOx such as NO, which if discharged directly into the atmosphere can lead to highly corrosive acid rain, the flue gases must be denitrified (i.e., denitrified) prior to discharge.
In patent No. CN208852665U, a selective non-catalytic reduction denitration device is disclosed, which controls the output flow rate of a process water delivery pump, and when the concentration of nitrogen oxides in a boiler is too high, reduces the output flow rate of the process water delivery pump, increases the concentration of urea, and makes urea with sufficient concentration react with the high-concentration nitrogen oxides, and conversely, when the concentration of oxides in the boiler is lower, increases the output flow rate of the process water delivery pump, and dilutes urea solution, thereby saving cost; however, the apparatus has the following drawbacks: because urea is solid particles, needs to absorb heat when dissolved in water and has certain corrosivity and recrystallization, in practice, common desalted water is dissolved into 10 mass percent of water solution, water accounting for 90 mass percent of the solution is vaporized in a furnace to absorb a large amount of heat, great waste of energy is caused, the temperature of flue gas at the injection point of the water solution is suddenly reduced, nearby unburned carbon particles are extinguished, the carbon content of fly ash is increased, the coal consumption is increased, and pipe explosion is caused by corrosion of a multi-water-cooled wall, and the three reasons seriously restrict the use of urea selective non-catalytic reduction; the existing denitration device is inconvenient for crushing urea particles, and is beneficial to full reaction after the powder is sprayed into a furnace body, so that the utilization rate of the denitration device is improved, and the reduction efficiency of the denitration agent powder to flue gas is improved; and be not convenient for through driving the inlet pipe flexible and rotatory, be convenient for inhale the material to each position in the storage box, improve its application scope, facilitate the use, be convenient for its absorptive cleaner.
Disclosure of Invention
In order to overcome the technical problems, the invention aims to provide a selective non-catalytic reduction flue gas denitration process, which comprises the steps of crushing a denitration agent into powder, spraying the powder into a furnace body for reaction, fully reacting the powder, improving the utilization rate of the denitration agent, and improving the reduction efficiency of the powder of the denitration agent on flue gas; the problem that the water-cooled wall is corroded frequently to cause tube explosion due to certain corrosivity and recrystallization caused by heat absorption when the water-cooled wall is dissolved in water is solved; the flue gas temperature at the injection point of the aqueous solution suddenly drops, so that unburned carbon particles nearby are extinguished, and the technical problems of fly ash carbon content increase and coal consumption increase are caused;
the denitration agent is crushed into powder by starting the driving motor to drive the rotating shaft to rotate, the rotating shaft drives the first bevel gear to rotate, the first bevel gear is meshed with the second bevel gear, the bevel gear drives the second bevel gear to rotate, the second bevel gear drives the second rotating shaft to rotate, the second rotating shaft drives the rotating disc to rotate, the rotating disc drives the four rotating knives to rotate, the rotating motor is driven to drive the crushing blades to rotate simultaneously, the rotating knives and the crushing blades rotate simultaneously, the crushing effect of the denitration agent is improved, the technical problems that in the prior art, after the powder is inconvenient to be sprayed into a furnace body, the reaction can be fully carried out, the utilization rate of the denitration agent is improved, and the reduction efficiency of the denitration agent powder to flue gas is improved are solved; meanwhile, the knob is rotated to drive the rotating shaft to rotate, the rotating shaft drives the rotating knife to rotate, the rotating knife is matched with the circular groove and is conveniently placed in the circular groove, the rotating knife is convenient to fold and unfold, the rotating radius of the four rotating knives is convenient to adjust, the use is convenient, and the technical problem that the existing crushing equipment is inconvenient to fold and unfold is solved;
the first gear is driven to rotate by simultaneously driving the first servo motor, the first gear is meshed with the second gear to further drive the second gear to rotate, the second gear drives the transmission shaft to rotate, the transmission shaft drives the insertion tube to rotate, the insertion tube drives the feeding tube to rotate through the first support and the second support, and the rotation angle of the feeding tube is adjusted; and drive servo motor two, drive the lead screw and rotate, the lead screw passes through the thread bush and drives the inserted bar flexible, and then drives the inlet pipe flexible, through driving the inlet pipe flexible and rotatory, solved prior art and be not convenient for inhale the material to each position in the storage box, improve its application scope, facilitate the use, be not convenient for its absorptive cleaner technical problem.
The purpose of the invention can be realized by the following technical scheme:
a selective non-catalytic reduction flue gas denitration process comprises the following steps:
step one, crushing a denitration agent: adding a denitrifying agent into a grinding shell of a denitrifying device, starting a driving motor to drive a rotating shaft to rotate, wherein the rotating shaft drives a bevel gear I to rotate, the bevel gear I is meshed with a bevel gear II, the bevel gear drives the bevel gear II to rotate, the bevel gear II drives a rotating shaft II to rotate, the rotating shaft II drives a rotating disc to rotate, the rotating disc drives four rotating knives to rotate, meanwhile, the driving rotating motor drives crushing fan blades to rotate, the rotating knives and the crushing fan blades rotate simultaneously to crush the denitrifying agent into powder, and then the powder falls into a storage box through a funnel;
step two, conveying a denitration agent: the denitration agent powder conveying device comprises a motor, a first rotating shaft, a second rotating shaft, a rotary rod, a scraper, a conveying pipe, a transmission shaft, an insertion pipe, a first servo motor, a second servo motor, a first gear, a second gear, a transmission shaft, a second bracket and a second bracket, wherein the motor is driven to drive the draught fan to suck crushed denitration agent powder into a furnace body; the second servo motor is driven to drive the screw rod to rotate, and the screw rod drives the inserted rod to stretch through the threaded sleeve, so that the feeding pipe is driven to stretch;
step three, reducing the flue gas: adopting SNCR technology, using denitration agent powder as reducing agent, spraying denitration agent powder into furnace body, at 850-1300 deg.C, making denitration agent powder contact with flue gas to reduce NO in flue gasX。
As a further scheme of the invention: the denitration agent is urea.
As a further scheme of the invention: the contact time of the denitrifier powder and the flue gas is 0.1-2 seconds.
As a further scheme of the invention: the denitration device comprises a furnace body, a conveying pipe is fixedly mounted on one side of the furnace body, an induced draft fan is fixedly mounted at one end of the top of the conveying pipe, the other end of the conveying pipe extends into a storage box, a flexible hose is fixedly mounted at the end of the other end of the conveying pipe, an inlet pipe is fixedly mounted at the other end of the flexible hose, a motor is fixedly mounted on one side of the inlet pipe, an output shaft of the motor is connected with a first rotating shaft arranged inside the inlet pipe, two ends of the first rotating shaft are rotatably connected with the inlet pipe, a plurality of rotating rods are uniformly mounted on the first rotating shaft in a circumferential shape, a scraper is arranged at the other end of each rotating rod, and is of an arc-shaped structure and inclines inwards;
a driving motor is horizontally and fixedly installed at one end of the bottom of the storage box, a synchronous belt pulley is sleeved on an output shaft of the driving motor and drives a rotating shaft to rotate through a belt, the rotating shaft extends into the grinding shell, a first bevel gear is fixedly installed at the other end of the rotating shaft and is meshed with a second bevel gear, the first bevel gear and the second bevel gear are vertically arranged, the second bevel gear is sleeved on the second rotating shaft, and a crushing mechanism is fixedly installed at the top of the second rotating shaft; the grinding shell is of a hollow structure, a feed inlet is formed in the top of the grinding shell, a funnel is fixedly mounted at the bottom of the grinding shell, the funnel is arranged in an inclined mode, and the funnel stretches into the storage box.
As a further scheme of the invention: the utility model discloses a support of inserting pipe, including conveyer pipe, support two, inserted pipe, slide rail, inserted pipe, screw thread cover, support one, support two, the inside fixed mounting of inserted pipe has set up servo motor two with the intubate level, horizontal installation has the lead screw on servo motor two's the output shaft, be connected with the inserted bar through the screw thread cover on the lead screw, slider and slide rail sliding connection are passed through to the bottom of inserted bar, slide rail fixed mounting is on the bottom inner wall of intubate, intubate and inserted bar are square pipe, just the inserted bar inserts in the intubate, the bottom one end fixed mounting of inserted bar has support one, support one bottom and inlet pipe fixed connection.
As a further scheme of the invention: the utility model discloses a gear assembly, including the intubate, the top of intubate is installed respectively transmission shaft and bracing piece, the top of bracing piece rotates with the top inner wall of storage box to be connected, the top fixed mounting of transmission shaft has gear two, gear two rotates the bottom of installing at the fixed plate, fixed plate fixed mounting is at the top inner wall of storage box, gear two meshes with gear one and is connected, the bottom fixed mounting of gear one is on servo motor one's output shaft, servo motor one vertical setting, gear one's top is rotated and is installed on the fixed plate.
As a further scheme of the invention: rubbing crusher constructs including the carousel, circular recess has been seted up in the outside of carousel, it is connected with four rotatory swoves, four to rotate through the axis of rotation on the circular recess rotatory sword is the arc structure, and four rotatory sword orientation is the same, four rotatory sword all with the recess adaptation, the top fixed mounting of axis of rotation has the knob, the equal vertical fixed mounting of tip of four rotatory swoves has the rotating electrical machines, fixed mounting has crushing flabellum on the output shaft of rotating electrical machines.
The invention has the beneficial effects that:
the denitration agent is crushed into powder and then sprayed into the furnace body to react, so that the denitration agent can fully react, the utilization rate of the denitration agent is improved, and the reduction efficiency of the denitration agent powder to flue gas is improved; the urea is a stable and nontoxic solid material, is harmless to people and environment, and can be transported in bulk and stored for a long time; the phenomenon that the water-cooled wall is corroded to cause tube explosion is avoided, and the water-cooled wall is dissolved in water and needs to absorb heat, so that the water-cooled wall has certain corrosivity and recrystallization; the flue gas temperature at the injection point of the aqueous solution suddenly drops, so that nearby unburned carbon particles are extinguished, and the carbon content of fly ash and the coal consumption are increased.
The denitration agent is added into a grinding shell of the denitration device, the driving motor is started to drive the rotating shaft to rotate, the rotating shaft drives the bevel gear I to rotate, the bevel gear I is meshed with the bevel gear II, the bevel gear drives the bevel gear II to rotate, the bevel gear II drives the rotating shaft II to rotate, the rotating shaft II drives the rotating disc to rotate, the rotating disc drives the four rotating knives to rotate, the rotating motor is driven to drive the crushing fan blades to rotate simultaneously, the rotating knives and the crushing fan blades rotate simultaneously to crush the denitration agent into powder, the crushing effect of the denitration agent is improved by simultaneously working the rotating knives and the crushing fan blades, after the denitration agent is crushed, the denitration agent can be fully reacted after being favorably sprayed into a furnace body, the utilization rate of the denitration agent is improved, and the reduction efficiency of the denitration agent powder to flue gas is improved; meanwhile, the knob is rotated to drive the rotating shaft to rotate, the rotating shaft drives the rotating knife to rotate, the rotating knife is matched with the circular groove and is conveniently placed in the circular groove, the folding and unfolding of the rotating knife are facilitated, the rotating radius of the four rotating knives is convenient to adjust, and the use is convenient;
according to the invention, the draught fan is driven to suck the crushed denitrifier powder into the furnace body, when the furnace body sucks urea powder, the motor is started to drive the rotating shaft to rotate, the rotating shaft drives the rotating rod to rotate, the rotating rod drives the scraping plate to rotate, and the urea powder is dug into the feeding pipe, so that the denitration agent powder is conveyed in an accelerated manner, the blockage is avoided, the uneven conveying of the powder is caused, the conveying effect is poor, the denitration agent powder is not beneficial to fully reacting with flue gas entering the furnace body, and the reduction efficiency of the flue gas is low;
the first gear is driven to rotate by simultaneously driving the first servo motor, the first gear is meshed with the second gear to further drive the second gear to rotate, the second gear drives the transmission shaft to rotate, the transmission shaft drives the insertion pipe to rotate, the insertion pipe drives the feeding pipe to rotate through the first bracket and the second bracket, and the rotation angle of the feeding pipe is adjusted; the screw rod drives the inserted rod to stretch through the threaded sleeve, so that the feeding pipe is driven to stretch, and the feeding pipe is driven to stretch through stretching and rotating, so that the material can be conveniently sucked at each position in the storage box, the application range of the storage box is improved, the storage box is convenient to use, and the material can be conveniently and cleanly absorbed; meanwhile, the device enables the powder conveying speed to be more uniform and the reduction effect to be better.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic view of the overall structure of a denitration apparatus according to the present invention;
FIG. 2 is a schematic view showing an internal structure of a storage box according to the present invention;
FIG. 3 is a schematic view of the overall structure of the feed pipe and the feed pipe of the present invention;
FIG. 4 is a schematic front view of a servo motor according to the present invention;
FIG. 5 is a schematic view of the internal structure of the cannula according to the present invention;
FIG. 6 is a schematic view of the internal structure of the feed tube of the present invention;
FIG. 7 is a side view of the grinding shell of the present invention;
FIG. 8 is a schematic view of the overall structure of the crushing mechanism of the present invention.
In the figure: 1. a furnace body; 2. an induced draft fan; 3. a delivery pipe; 4. a drive motor; 5. a rotating shaft; 6. grinding the shell; 7. a storage box; 8. a feed pipe; 9. a first bracket; 10. a flexible hose; 11. a second bracket; 12. inserting a tube; 13. a drive shaft; 14. a fixing plate; 15. a first servo motor; 16. a support bar; 17. inserting a rod; 18. a slide rail; 19. a screw rod; 20. a servo motor II; 21. a first gear; 22. a second gear; 23. rotating the rod; 24. a first rotating shaft; 25. a squeegee; 26. a funnel; 27. a first bevel gear; 28. a second bevel gear; 29. a second rotating shaft; 30. a crushing mechanism; 31. a turntable; 32. a rotary knife; 33. crushing fan blades; 34. a rotating electric machine; 35. a rotating shaft; 36. a groove; 37. a knob.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-8, a selective non-catalytic reduction flue gas denitration process includes the following steps:
step one, crushing a denitration agent: adding a denitrifying agent into a grinding shell 6 of a denitrifying device, starting a driving motor 4 to drive a rotating shaft 5 to rotate, wherein the rotating shaft 5 drives a bevel gear I27 to rotate, the bevel gear I27 is meshed with a bevel gear II 28, the bevel gear I27 drives a bevel gear II 28 to rotate, the bevel gear II 28 drives a rotating shaft II 29 to rotate, the rotating shaft II 29 drives a rotating disc 31 to rotate, the rotating disc 31 drives four rotating knives 32 to rotate, meanwhile, a driving rotating motor 34 drives crushing blades 33 to rotate, the rotating knives 32 and the crushing blades 33 rotate simultaneously to crush the denitrifying agent into powder, and then the powder falls into a storage box 7 through a hopper 26;
step two, conveying a denitration agent: the induced draft fan 2 is driven to suck the crushed denitration agent powder into the furnace body 1, when the furnace body 1 sucks the denitration agent powder, the motor is started to drive the first rotating shaft 24 to rotate, the first rotating shaft 24 drives the rotating rod 23 to rotate, the rotating rod 23 drives the scraper 25 to rotate, urea powder is dug into the feeding pipe 8, the denitration agent powder is conveyed in an accelerated manner, meanwhile, the first servo motor 15 is driven to drive the first gear 21 to rotate, the first gear 21 is meshed with the second gear 22 to further drive the second gear 22 to rotate, the second gear 22 drives the transmission shaft 13 to rotate, the transmission shaft 13 drives the insertion pipe 12 to rotate, the insertion pipe 12 drives the feeding pipe 8 to rotate through the first support 9 and the second support 11, and the rotation angle of the feeding pipe 8 is adjusted; the second servo motor 20 is driven to drive the screw rod 19 to rotate, and the screw rod 19 drives the inserted rod 17 to extend and retract through the threaded sleeve, so that the feeding pipe 8 is driven to extend and retract;
step three, reducing the flue gas: using SNCR techniques toThe denitration agent powder is used as a reducing agent, the denitration agent powder is sprayed into the furnace body 1, and the denitration agent powder contacts with the flue gas to reduce NO in the flue gas at 850-1300 DEG CX。
The denitration agent is urea, the urea is selected to replace ammonia as a reducing agent, the denitration agent is safer than ammonia and can achieve the same denitration performance, the urea is a stable and nontoxic solid material, is harmless to people and environment, can be transported in bulk and stored for a long time, and meanwhile, the urea can be crushed into powder, so that the urea can fully react, the utilization rate of the urea is improved, and the reduction efficiency of the denitration agent powder to flue gas is improved.
The contact time of the denitrifier powder and the flue gas is 0.1-2 seconds.
The denitration device comprises a furnace body 1, a conveying pipe 3 is fixedly arranged on one side of the furnace body 1, an induced draft fan 2 is fixedly arranged above the conveying pipe 3, the other end of the conveying pipe 3 extends into the storage tank 7, the end part of the other end of the conveying pipe 3 is fixedly provided with a flexible hose 10, the other end of the telescopic hose 10 is fixedly provided with a feeding pipe 8, one side of the feeding pipe 8 is fixedly provided with a motor, an output shaft of the motor is connected with a first rotating shaft 24 arranged inside the feeding pipe 8, two ends of the first rotating shaft 24 are rotatably connected with the feeding pipe 8, a plurality of rotating rods 23 are uniformly arranged on the outer circumference of the rotating shaft 24, a scraping plate 25 is arranged at the other end of each rotating rod 23, the scraping plate 25 is of an arc-shaped structure, the scraping plates 25 are inclined inwards, the urea powder is conveniently dug by the scraper 25, so that the urea powder is conveyed quickly;
the top of the conveying pipe 3 is rotatably provided with a second support 11, the top of the second support 11 is fixedly connected with the bottom of an insertion pipe 12, a second servo motor 20 horizontally arranged with the insertion pipe 12 is fixedly arranged inside the insertion pipe 12, an output shaft of the second servo motor 20 is horizontally provided with a lead screw 19, the lead screw 19 is connected with an insertion rod 17 through a threaded sleeve, the bottom of the insertion rod 17 is slidably connected with a sliding rail 18 through a sliding block, the sliding rail 18 is fixedly arranged on the inner wall of the bottom of the insertion pipe 12, the insertion pipe 12 and the insertion rod 17 are both square pipes, the insertion rod 17 is inserted into the insertion pipe 12, one end of the bottom of the insertion rod 17 is fixedly provided with a first support 9, and the bottom of the first support 9 is fixedly connected with a feeding pipe 8;
a transmission shaft 13 and a support rod 16 are respectively installed at the top of the insertion tube 12, the top of the support rod 16 is rotatably connected with the inner wall of the top of the storage box 7, a second gear 22 is fixedly installed at the top of the transmission shaft 13, the second gear 22 is rotatably installed at the bottom of a fixing plate 14, the fixing plate 14 is fixedly installed on the inner wall of the top of the storage box 7, the second gear 22 is meshed with a first gear 21, the bottom of the first gear 21 is fixedly installed on an output shaft of a first servo motor 15, the first servo motor 15 is vertically arranged, and the top of the first gear 21 is rotatably installed on the fixing plate 14;
a driving motor 4 is horizontally and fixedly installed at one end of the bottom of the storage box 7, a synchronous belt pulley is sleeved on an output shaft of the driving motor 4, the synchronous belt pulley drives a rotating shaft 5 to rotate through a belt, the rotating shaft 5 extends into the grinding shell 6, a first bevel gear 27 is fixedly installed at the other end of the rotating shaft 5, the first bevel gear 27 is meshed with a second bevel gear 28, the second bevel gear 28 is sleeved on a second rotating shaft 29, a crushing mechanism 30 is installed at the top of the second rotating shaft 29, the crushing mechanism 30 comprises a rotating disc 31, a circular groove 36 is formed in the outer side of the rotating disc 31, four rotating knives 32 are rotatably connected onto the circular groove 36 through rotating shafts 35, the four rotating knives 32 are all arc-shaped structures, the four rotating knives 32 are in the same direction, the four rotating knives 32 are all matched with the groove 36, and the rotating knives 32 can be conveniently collected into the groove 36, the top of the rotating shaft 35 is fixedly provided with a knob 37, the end parts of the four rotating knives 32 are vertically and fixedly provided with rotating motors 34, and the output shafts of the rotating motors 34 are fixedly provided with crushing fan blades 33;
grind casing 6 and be hollow structure, the feed inlet has been seted up at the top of grinding casing 6, grind 6 bottom fixed mounting of casing have funnel 26, funnel 26 slope sets up, and funnel 26 stretches into in the storage box 7, is convenient for arrange the urea powder in the storage box 7.
The working principle of the invention is as follows: adding a denitrifying agent into a grinding shell 6 of a denitrifying device, starting a driving motor 4 to drive a rotating shaft 5 to rotate, wherein the rotating shaft 5 drives a bevel gear I27 to rotate, the bevel gear I27 is meshed with a bevel gear II 28, the bevel gear I27 drives a bevel gear II 28 to rotate, the bevel gear II 28 drives a rotating shaft II 29 to rotate, the rotating shaft II 29 drives a rotating disc 31 to rotate, the rotating disc 31 drives four rotating knives 32 to rotate, meanwhile, a rotating motor 34 is driven to drive crushing blades 33 to rotate, the rotating knives 32 and the crushing blades 33 rotate simultaneously to crush the denitrifying agent into powder, and the rotating knives 32 and the crushing blades 33 work simultaneously to improve the crushing effect of the denitrifying agent; meanwhile, the knob 37 is rotated to drive the rotating shaft 35 to rotate, the rotating shaft 35 drives the rotating knife 32 to rotate, the rotating knife 32 is matched with the circular groove 36 and is conveniently placed in the circular groove 36, the folding and unfolding of the rotating knife are convenient, the rotating radius of the four rotating knives 32 is convenient to adjust, and the use is convenient;
the induced draft fan 2 is driven to suck the crushed denitration agent powder into the furnace body 1, when the furnace body 1 sucks urea powder, the motor is started to drive the first rotating shaft 24 to rotate, the first rotating shaft 24 drives the rotating rod 23 to rotate, the rotating rod 23 drives the scraper 25 to rotate, the urea powder is dug into the feeding pipe 8, the denitration agent powder is conveyed in an accelerated manner, the blockage is avoided, the conveying effect is poor due to the fact that the conveying powder is not uniform, the denitration agent powder is not favorable for entering the furnace body 1 to fully react with flue gas, and the reduction efficiency of the flue gas is low;
simultaneously driving a servo motor I15 to drive a gear I21 to rotate, wherein the gear I21 is meshed with a gear II 22 to further drive the gear II 22 to rotate, the gear II 22 drives a transmission shaft 13 to rotate, the transmission shaft 13 drives an insertion tube 12 to rotate, the insertion tube 12 drives a feeding tube 8 to rotate through a support I9 and a support II 11, and the rotation angle of the feeding tube 8 is adjusted; and the second servo motor 20 is driven to drive the screw rod 19 to rotate, the screw rod 19 drives the inserted rod 17 to stretch through the threaded sleeve, so that the feeding pipe 8 is driven to stretch, and the feeding pipe 8 is driven to stretch and rotate, so that the material can be conveniently sucked at each position in the storage box 7, the application range of the material sucking machine is improved, the material sucking machine is convenient to use, and the material sucking machine is convenient to absorb more cleanly.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.
Claims (3)
1. A selective non-catalytic reduction flue gas denitration process is characterized by comprising the following steps:
step one, crushing a denitration agent: adding a denitrifying agent into a grinding shell (6) of a denitrifying device, starting a driving motor (4) to drive a rotating shaft (5) to rotate, wherein the rotating shaft (5) drives a bevel gear I (27) to rotate, the bevel gear I (27) is meshed with a bevel gear II (28), the bevel gear I (27) drives the bevel gear II (28) to rotate, the bevel gear II (28) drives a rotating shaft II (29) to rotate, the rotating shaft II (29) drives a rotating disc (31) to rotate, the rotating disc (31) drives four rotating knives (32) to rotate, meanwhile, the rotating motor (34) is driven to drive crushing blades (33) to rotate, the rotating knives (32) and the crushing blades (33) rotate simultaneously to crush the denitrifying agent into powder, and then the denitrifying agent falls into a storage box (7) through a hopper (26);
step two, conveying a denitration agent: the denitration agent powder denitration device comprises a draught fan (2) and a scraper blade (22), wherein the draught fan (2) is driven to suck crushed denitration agent powder into a furnace body (1), when the furnace body (1) sucks the denitration agent powder, a motor is started to drive a first rotating shaft (24) to rotate, the first rotating shaft (24) drives a rotating rod (23) to rotate, the rotating rod (23) drives the scraper blade (25) to rotate, urea powder is dug into a feeding pipe (8), the denitration agent powder is conveyed in an accelerated manner, meanwhile, a servo motor (15) is driven to drive a first gear (21) to rotate, the first gear (21) is meshed and connected with a second gear (22), the second gear (22) is further driven to rotate, the second gear (22) drives a transmission shaft (13) to rotate, the transmission shaft (13) drives an insertion pipe (12) to rotate, the insertion pipe (12) drives the feeding pipe (8) to rotate through a first support (9) and a second support (11), and the rotation angle of the feeding pipe (8) is adjusted; the second servo motor (20) is driven to drive the screw rod (19) to rotate, and the screw rod (19) drives the inserted rod (17) to stretch through a threaded sleeve, so that the feeding pipe (8) is driven to stretch;
step three, reducing the flue gas: adopting SNCR technology, taking the denitrifier powder as a reducing agent, spraying the denitrifier powder into the furnace body (1), and reducing NO in the flue gas by contacting the denitrifier powder and the flue gas at 850-X；
The denitration device comprises a furnace body (1), one side fixed mounting of the furnace body (1) is provided with a conveying pipe (3), one end of the top of the conveying pipe (3) is fixedly provided with a draught fan (2), the other end of the conveying pipe (3) extends into a storage box (7), the other end of the conveying pipe (3) is fixedly provided with a flexible hose (10), the other end of the flexible hose (10) is fixedly provided with an inlet pipe (8), one side of the inlet pipe (8) is fixedly provided with a motor, an output shaft of the motor is connected with a first rotating shaft (24) which is arranged inside the inlet pipe (8), two ends of the first rotating shaft (24) are rotatably connected with the inlet pipe (8), the first rotating shaft (24) is externally provided with a plurality of rotating rods (23) in a circumferential shape, the other end of the rotating rods (23) is provided with a scraper (25), and the scraper (25) is in an arc-shaped structure, and the scrapers (25) are inclined inward;
a driving motor (4) is horizontally and fixedly installed at one end of the bottom of the storage box (7), a synchronous belt pulley is sleeved on an output shaft of the driving motor (4), the synchronous belt pulley drives a rotating shaft (5) to rotate through a belt, the rotating shaft (5) extends into the grinding shell (6), a first bevel gear (27) is fixedly installed at the other end of the rotating shaft (5), the first bevel gear (27) is meshed with a second bevel gear (28), the first bevel gear (27) and the second bevel gear (28) are vertically arranged, the second bevel gear (28) is sleeved on a second rotating shaft (29), and a crushing mechanism (30) is fixedly installed at the top of the second rotating shaft (29); the grinding shell (6) is of a hollow structure, a feed inlet is formed in the top of the grinding shell (6), a funnel (26) is fixedly mounted at the bottom of the grinding shell (6), the funnel (26) is obliquely arranged, and the funnel (26) extends into the storage box (7);
a second bracket (11) is rotatably arranged at the top of the conveying pipe (3), the top of the second bracket (11) is fixedly connected with the bottom of the insertion pipe (12), a second servo motor (20) horizontally arranged with the insertion tube (12) is fixedly arranged in the insertion tube (12), a screw rod (19) is horizontally arranged on an output shaft of the servo motor II (20), the screw rod (19) is connected with the inserted rod (17) through a threaded sleeve, the bottom of the inserted bar (17) is connected with the slide rail (18) in a sliding way through a slide block, the slide rail (18) is fixedly arranged on the inner wall of the bottom of the insertion pipe (12), the insertion pipe (12) and the insertion rod (17) are both square pipes, the inserting rod (17) is inserted into the inserting pipe (12), one end of the bottom of the inserting rod (17) is fixedly provided with a first support (9), and the bottom of the first support (9) is fixedly connected with the feeding pipe (8);
a transmission shaft (13) and a support rod (16) are respectively installed at the top of the insertion pipe (12), the top of the support rod (16) is rotatably connected with the inner wall of the top of the storage box (7), a second gear (22) is fixedly installed at the top of the transmission shaft (13), the second gear (22) is rotatably installed at the bottom of a fixing plate (14), the fixing plate (14) is fixedly installed on the inner wall of the top of the storage box (7), the second gear (22) is meshed with a first gear (21), the bottom of the first gear (21) is fixedly installed on an output shaft of a first servo motor (15), the first servo motor (15) is vertically arranged, and the top of the first gear (21) is rotatably installed on the fixing plate (14);
rubbing crusher constructs (30) including carousel (31), circular recess (36) have been seted up in the outside of carousel (31), rotate through axis of rotation (35) on circular recess (36) and be connected with four revolving knives (32), four revolving knives (32) are the arc structure, and four revolving knives (32) orientation is the same, and four revolving knives (32) all with recess (36) adaptation, the top fixed mounting of axis of rotation (35) has knob (37), and the equal vertical fixed mounting in tip of four revolving knives (32) has rotating electrical machines (34), fixed mounting has crushing flabellum (33) on the output shaft of rotating electrical machines (34).
2. The selective non-catalytic reduction flue gas denitration process of claim 1, wherein the denitration agent is urea.
3. The selective non-catalytic reduction flue gas denitration process of claim 1, wherein the contact time of the denitration agent powder and the flue gas is 0.1-2 seconds.
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| CN105771645B (en) * | 2016-04-28 | 2019-02-12 | 昌邑大伟环保科技有限公司 | Coal-burning boiler macromolecule Dry denitration agent and preparation method thereof and denitrating technique |
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