CN108704475A - A kind of thermoelectricity station-service SCR denitration device - Google Patents
A kind of thermoelectricity station-service SCR denitration device Download PDFInfo
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- CN108704475A CN108704475A CN201810603456.5A CN201810603456A CN108704475A CN 108704475 A CN108704475 A CN 108704475A CN 201810603456 A CN201810603456 A CN 201810603456A CN 108704475 A CN108704475 A CN 108704475A
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- filter screen
- ammonia water
- module
- flue gas
- box body
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- 230000005619 thermoelectricity Effects 0.000 title abstract 2
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000003054 catalyst Substances 0.000 claims abstract description 67
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000003546 flue gas Substances 0.000 claims abstract description 62
- 239000000428 dust Substances 0.000 claims abstract description 39
- 238000005507 spraying Methods 0.000 claims abstract description 21
- 235000011114 ammonium hydroxide Nutrition 0.000 claims description 99
- 238000003756 stirring Methods 0.000 claims description 38
- 238000007667 floating Methods 0.000 claims description 12
- 238000000034 method Methods 0.000 claims description 9
- 238000005096 rolling process Methods 0.000 claims description 7
- 230000001502 supplementing effect Effects 0.000 claims description 5
- 239000013589 supplement Substances 0.000 claims description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 abstract description 15
- 230000000694 effects Effects 0.000 abstract description 11
- 229910021529 ammonia Inorganic materials 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 abstract 6
- 239000000908 ammonium hydroxide Substances 0.000 abstract 3
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 239000012535 impurity Substances 0.000 description 24
- 239000002245 particle Substances 0.000 description 18
- 239000002344 surface layer Substances 0.000 description 12
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 11
- 230000003197 catalytic effect Effects 0.000 description 6
- 239000000779 smoke Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 5
- 238000006555 catalytic reaction Methods 0.000 description 4
- 239000008187 granular material Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 230000005484 gravity Effects 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 238000010531 catalytic reduction reaction Methods 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8631—Processes characterised by a specific device
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/10—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces
- B01D46/12—Particle separators, e.g. dust precipitators, using filter plates, sheets or pads having plane surfaces in multiple arrangements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/18—Particle separators, e.g. dust precipitators, using filtering belts
- B01D46/20—Particle separators, e.g. dust precipitators, using filtering belts the belts combined with drums
-
- 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
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/90—Injecting reactants
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Health & Medical Sciences (AREA)
- Biomedical Technology (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention belongs to gas denitrifying technology field, specifically a kind of thermoelectricity station-service SCR denitration device, including babinet, gas inlet, ammonium hydroxide inlet tube, exhanst gas outlet, dedusting module, ammonia spraying module, filter screen module and catalyst make-up module；Gas inlet is set on the left of babinet；Ammonium hydroxide inlet tube is located at the lower section of gas inlet；Top of the box is equipped with exhanst gas outlet；Dedusting module is for being dusted flue gas；Ammonia spraying module is mixed for spraying ammonium hydroxide with flue gas；Filter screen module is mounted in babinet；Catalyst make-up module is located at the top of filter screen module, and the side wall of babinet is equipped with toroidal cavity, and catalyst make-up module is slidably mounted in toroidal cavity.The required equipment for denitrifying flue gas of the present apparatus is small, and space is small, excellent for the dust removing effects of flue gas, and dedusting more thoroughly, improves the effect rapid decrease of catalyst, divests the part of catalyst coating failure, while freely adding catalyst.
Description
Technical Field
The invention belongs to the technical field of flue gas denitration, and particularly relates to an SCR denitration device for a thermal power plant.
Background
Nitrogen oxides (NOx) in flue gas of coal-fired power plants are one of main atmospheric pollutants, and the emission of the nitrogen oxides in the flue gas is mainly treated by using a Selective Catalytic Reduction (SCR) technology at present, namely, a reducing agent is used for selectively reacting with the nitrogen oxides in the flue gas to generate nontoxic and pollution-free nitrogen (N)2) And water (H)2O), thereby achieving the aims of denitration and environmental protection.
At present, a newly built power plant usually adopts a Selective Catalytic Reduction (SCR) process for denitration. The SCR denitration system generally consists of an SCR reactor, a catalyst module, an ammonia storage and supply system, an ammonia injection system, an economizer bypass, an SCR bypass, and related test control systems. The SCR process has good denitration effect but large investment, and requires a catalyst module with good pollution resistance to resist SO2And H2Disadvantage of O(ii) an effect; it is also desired to have good thermal shock resistance and mechanical strength properties. In addition, the SCR reactor needs to be arranged between the boiler and the dust remover, and the SCR reactor is large in size, so that no enough space can be used between the boiler and the dust remover of an old power plant in China, and the SCR process cannot be adopted for denitration. In addition, the existing SCR system has the defect that the catalytic effect is rapidly reduced after the SCR system works for a period of time. Therefore, development of a new flue gas denitration apparatus and a flue gas denitration method are required.
Some technical schemes for SCR denitration also appear in the prior art, and for example, a chinese patent with application number 201720164033.9 discloses an SCR denitration reactor and system. The SCR denitration reactor comprises dust removal equipment, a catalytic chamber and wind resistance compensation equipment. The dust removal device is arranged at the inlet of the flue, the wind resistance compensation device is arranged at the outlet of the flue, and the stainless steel mesh layer and the catalytic layer are sequentially arranged in the flue from the inlet of the flue to the outlet of the flue. The structure of the denitration reactor is scientifically and reasonably designed, the catalyst holes are not easy to block, the resistance of the catalyst is small, and the denitration reactor has a good catalytic reaction effect. SCR deNOx systems, including the mixer with the utility model provides an SCR denitration reactor, the mixer is connected with dust collecting equipment. This deNOx systems's reaction is abundant, and the denitration is effectual, efficient.
But this technical scheme is unsatisfactory to the dust removal effect of flue gas on the one hand, and dust collection efficiency is low, and on the other hand to catalysis with can not in time handle and add supplementary catalyst that became invalid, lead to the catalytic effect to descend.
Disclosure of Invention
In order to make up for the defects of the prior art, the SCR denitration device for the thermal power plant provided by the invention has the advantages that the required flue gas denitration device is small in size, small in occupied space, excellent in flue gas dust removal effect and thorough in dust removal, the effect of the catalyst is rapidly reduced and improved, the failure part of the surface layer of the catalyst is stripped, and the catalyst is freely added.
The technical scheme adopted by the invention for solving the technical problems is as follows: the SCR denitration device for the thermal power plant comprises a box body, a flue gas inlet, an ammonia water inlet pipe, a flue gas outlet, a dust removal module, an ammonia water spraying module, a filter screen module and a catalyst supplement module, wherein the flue gas inlet is communicated with the flue gas inlet; the left side of the box body is provided with a flue gas inlet; the ammonia water inlet pipe is positioned below the flue gas inlet; the top of the box body is provided with a smoke outlet; the dust removal module is positioned in the flue gas inlet and is used for removing dust from the flue gas; the ammonia water spraying module is arranged on the ammonia water inlet pipe and is used for spraying ammonia water to be mixed with the flue gas; the filter screen module is arranged in the box body; the catalyst replenishing module is positioned above the filter screen module, a circular groove is formed in the side wall of the box body, and the catalyst replenishing module is slidably mounted in the circular groove; the filter screen module comprises a first filter screen, a second filter screen, a fixed block and a screw; the first filter screen is fixedly arranged on the inner wall of the box body; the fixed block is fixedly arranged on the inner wall of the box body; the second filter screen is positioned below the first filter screen, the second filter screen is placed on the fixed block, a threaded hole is formed in the right side of the second filter screen, and the diameter of the filter screen hole of the second filter screen is larger than that of the filter screen hole of the first filter screen; and the screw penetrates through the side wall of the box body and is arranged in a threaded hole of the second filter screen, and the screw is used for enabling the second filter screen to move left and right.
The first limiting block and the second limiting block are mounted on the screw; the first limiting block is positioned inside the box body; the second limiting block is positioned outside the box body; the first limiting block and the second limiting block are matched to enable the screw to rotate without moving left and right. When the catalyst filter works, the screws are adjusted to enable the filter holes of the second filter screen to be aligned with the filter holes of the first filter screen, and all the invalid catalyst particles are discharged.
The dust removal module comprises a motor I, a driving wheel, a driven wheel, a filter screen III and a tooth block I; the driving wheel is arranged on a motor shaft of the motor I, the ammonia water inlet pipe is provided with an opening, and the driving wheel is positioned in the ammonia water inlet pipe; the driven wheel is rotatably arranged on the side wall of the box body; the filter screen is sleeved on the driving wheel and the driven wheel; the first tooth block is uniformly arranged on the third filter screen. When the smoke dust remover works, the first motor is started, the first motor drives the driving wheel to rotate, the driving wheel drives the third filter screen to rotate, and the third filter screen removes dust and impurities in smoke.
The ammonia water spraying module comprises a rolling shaft, a second tooth block, an ammonia water pipe and a spherical nozzle; the roller is positioned in the ammonia water inlet pipe; the second tooth blocks are uniformly arranged on the rolling shaft; the ammonia water pipe is connected to the ammonia water inlet pipe, and the ammonia water pipe guides ammonia water to a flue gas inlet; the spherical nozzle is arranged on the ammonia water pipe through a branch pipe, and a first round hole is formed in the spherical nozzle. When the ammonia water spraying device works, the second tooth blocks on the rolling shaft are meshed with the first tooth blocks on the third filter screen to drive the rolling shaft to roll, ammonia water is pushed out of the ammonia water pipe, and the ammonia water is sprayed out of the spherical nozzle.
The spherical nozzle also comprises a floating ball, a first spring, a second spring and a guide plate; one end of the first spring is mounted on the inner wall of the first round hole; one end of the second spring is mounted on the inner wall of the first round hole; the floating ball is arranged at the other ends of the first spring and the second spring; the guide plate is installed on the floating ball and penetrates out of the first round hole. During operation, the aqueous ammonia is spout from the round hole of globular nozzle, makes the floater of round hole during the aqueous ammonia blowout take place to rock, and the floater drives the guide plate and takes place to swing, makes the aqueous ammonia scope of spraying bigger.
The ammonia water pipe also comprises a filter screen IV, a vertical plate, a transverse plate, a support rod, a telescopic cylinder and a moving block; the filter screen IV is arranged in the ammonia water pipe; the ammonia water pipe is provided with a section of downward convex low-lying pipeline, the vertical plate is installed on the low-lying pipeline of the ammonia water pipe, and a second groove is formed in the vertical plate and penetrates through the vertical plate; the transverse plate is hinged to the vertical plate and provided with a first groove; one end of the supporting rod is movably arranged in the first groove of the transverse plate, and the other end of the supporting rod is movably arranged in the second groove of the vertical plate; a hollow cavity is formed in the vertical plate and communicated with the second groove; the telescopic cylinder is positioned in the hollow cavity in the vertical plate; the moving block is located in the second groove and is installed on the telescopic cylinder and is fixedly connected with the supporting rod. During operation, impurity and dust in the flue gas are detached to filter screen three, fall into the ammonia water pipe, and when these impurity process filter screen four-hour, impurity is blocked by filter screen four, and impurity falls the low-lying pipeline department of ammonia water pipe, when impurity piles up a certain amount, telescopic cylinder work promotes the movable block upwards, and the movable block takes the bracing piece upward movement, and the bracing piece props up the diaphragm, seals the low-lying pipeline of ammonia water pipe, then discharges impurity.
The catalyst supplementing module comprises a stirring bar, an electromagnet I, an electromagnet II, a hollow rod, fan blades, a bearing and a hose; the stirring bar is positioned in the annular groove on the side wall of the box body, and the lower surface of the stirring bar is provided with a triangular bulge; the first electromagnet is embedded on the stirring strip; the second electromagnet is arranged at the bottom of the annular groove in the side wall of the box body and is annular; the hollow rod is arranged on the stirring bar; the fan blades are arranged on the hollow rod; the bearing is arranged at the upper end of the hollow rod; the hose is sleeved on the outer ring of the bearing. When the device works, when the surface layer of catalyst particles fails, the electromagnet I and the electromagnet II are powered off, the stirring strip moves downwards under the action of self gravity, the hollow rod moves downwards with the stirring strip at the same time, the fan blades rotate due to smoke, the fan blades drive the stirring strip to rotate, the stirring strip stirs the catalyst on the filter screen module, the failed part of the surface layer of the catalyst particles is scraped, and the scraped surface layer of the catalyst falls down through the filter screen module; when catalyst granule almost all loses the catalysis function, catalyst granule diameter diminishes, utilizes two positions of screw adjustment filter screens, makes the filter screen hole of filter screen two aim at the filter screen hole of filter screen one, discharges catalyst granule is whole, adds catalyst granule through hollow rod, and the back that finishes of adding, the stirring strip can carry out the tiling to the catalyst evenly, and to two circular telegrams of electro-magnet and electro-magnet, electro-magnet two and electro-magnet one repel each other for the stirring strip rebound.
The invention has the following beneficial effects:
1. according to the SCR denitration device for the thermal power plant, the size of the denitration device is small, the occupied space is reduced, the dust removal effect is excellent when the dust removal module is used for removing dust from flue gas, the effect of the catalyst is rapidly reduced and improved, the invalid part of the surface layer of the catalyst is stripped by the catalyst supplementing module, the catalyst can be added in time, and the flue gas denitration efficiency is improved.
2. According to the invention, the dust removal module is arranged, and the driving wheel, the driven wheel and the filter screen are mutually matched, so that the flue gas is filtered and dedusted, the dust and impurities of the flue gas are filtered out, the denitration treatment of the flue gas is convenient, and the blockage phenomenon is avoided.
3. According to the invention, the catalyst supplementing module is arranged, the stirring strip, the hollow rod, the fan blade and the hose are matched with each other, the invalid part of the surface layer of the catalyst is scraped, and meanwhile, when the catalytic effect of the catalyst is not good, the catalyst is supplemented timely, so that the efficiency of flue gas denitration is ensured.
4. According to the invention, the ammonia water spraying module is arranged to mix the ammonia water and the flue gas together, so that denitration of the flue gas is accelerated, and the denitration efficiency is high.
Drawings
The invention will be further explained with reference to the drawings.
FIG. 1 is a front view of the present invention;
FIG. 2 is an enlarged view taken at A of FIG. 1 in accordance with the present invention;
FIG. 3 is an enlarged view of FIG. 1 taken at B in the present invention;
FIG. 4 is an enlarged view at C of FIG. 2 in accordance with the present invention;
in the figure: the device comprises a box body 1, a flue gas inlet 2, an ammonia water inlet pipe 3, a flue gas outlet 4, a dust removal module 5, a driving wheel 52, a driven wheel 53, a third filter screen 54, a first tooth block 55, an ammonia water spraying module 6, a rolling shaft 62, a second tooth block 63, an ammonia water pipe 64, a fourth filter screen 641, a vertical plate 642, a transverse plate 643, a supporting rod 644, a telescopic cylinder 645, a moving block 646, a spherical nozzle 65, a floating ball 66, a first spring 67, a second spring 68, a guide plate 69, a filter screen module 7, a first filter screen 71, a second filter screen 72, a fixed block 73, a screw 74, a catalyst supplement module 8, a stirring bar 81, a first electromagnet 82, a second electromagnet 83, a hollow.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further described with the specific embodiments.
As shown in fig. 1 to 4, the SCR denitration device for a thermal power plant according to the present invention includes a case 1, a flue gas inlet 2, an ammonia water inlet pipe 3, a flue gas outlet 4, a dust removal module 5, an ammonia water spray module 6, a filter screen module 7, and a catalyst supplement module 8; the left side of the box body 1 is provided with a flue gas inlet 2; the ammonia water inlet pipe 3 is positioned below the flue gas inlet 2; the top of the box body 1 is provided with a flue gas outlet 4; the dust removal module 5 is positioned in the flue gas inlet 2, and the dust removal module 5 is used for removing dust from flue gas; the ammonia water spraying module 6 is arranged on the ammonia water inlet pipe 3, and the ammonia water spraying module 6 is used for spraying ammonia water to be mixed with the flue gas; the filter screen module 7 is arranged in the box body 1; the catalyst replenishing module 8 is positioned above the filter screen module 7, a circular groove is formed in the side wall of the box body 1, and the catalyst replenishing module 8 is slidably mounted in the circular groove; the filter screen module 7 comprises a first filter screen 71, a second filter screen 72, a fixed block 73 and a screw 74; the first filter screen 71 is fixedly arranged on the inner wall of the box body 1; the fixed block 73 is fixedly arranged on the inner wall of the box body 1; the second filter screen 72 is positioned below the first filter screen 71, the second filter screen 72 is placed on the fixed block 73, a threaded hole is formed in the right side of the second filter screen 72, and the diameter of the filter screen hole of the second filter screen 72 is larger than that of the filter screen hole of the first filter screen 71; the screw 74 penetrates through the side wall of the box body 1 and is installed in a threaded hole of the second filter screen 72, and the screw 74 is used for enabling the second filter screen 72 to move left and right.
A first limiting block and a second limiting block are arranged on the screw 74; the first limiting block is positioned inside the box body 1; the second limiting block is positioned outside the box body 1; the first limiting block and the second limiting block are matched to enable the screw 74 to rotate without moving left and right. In operation, the screws 74 are adjusted to align the filter mesh openings of the second filter mesh 72 with the filter mesh openings of the first filter mesh 71, thereby discharging all the spent catalyst particles.
The dust removal module 5 comprises a motor I, a driving wheel 52, a driven wheel 53, a filter screen III 54 and a tooth block I55; the driving wheel 52 is arranged on a motor shaft of the first motor, the ammonia water inlet pipe 3 is provided with an opening, and the driving wheel 52 is positioned in the ammonia water inlet pipe 3; the driven wheel 53 is rotatably arranged on the side wall of the box body 1; the third filter screen 54 is sleeved on the driving wheel 52 and the driven wheel 53; the first tooth blocks 55 are uniformly arranged on the third filter screen 54. When the smoke dust remover works, the first motor is started, the first motor drives the driving wheel 52 to rotate, the driving wheel 52 drives the third filter screen 54 to rotate, and the third filter screen 54 removes dust and impurities in smoke.
The ammonia water spraying module 6 comprises a roller 62, a second tooth block 63, an ammonia water pipe 64 and a spherical nozzle 65; the roller 62 is positioned inside the ammonia water inlet pipe 3; the second gear blocks 63 are uniformly arranged on the roller 62; the ammonia water pipe 64 is connected to the ammonia water inlet pipe 3, and the ammonia water pipe 64 guides ammonia water to the flue gas inlet 2; the spherical nozzle 65 is arranged on the ammonia water pipe 64 through a branch pipe, and a first round hole is formed in the spherical nozzle 65. When the ammonia water sprayer works, the second tooth block 63 on the roller 62 is meshed with the first tooth block 55 on the third filter screen 54 to drive the roller 62 to roll, ammonia water is pushed out of the ammonia water pipe 64, and the ammonia water is sprayed out of the spherical nozzle 65.
The spherical nozzle 65 further comprises a floating ball 66, a first spring 67, a second spring 68 and a guide plate 69; one end of the first spring 67 is mounted on the inner wall of the first round hole; one end of the second spring 68 is arranged on the inner wall of the first round hole; the floating ball 66 is arranged at the other ends of the first spring 67 and the second spring 68; the guide plate 69 is arranged on the floating ball 66, and the guide plate 69 penetrates through the first round hole. During operation, the aqueous ammonia spouts from the round hole of globular nozzle 65 in one, makes the floater 66 in the round hole in one take place to rock during the aqueous ammonia blowout, and floater 66 drives guide plate 69 and takes place the swing, makes the aqueous ammonia scope of spouting bigger.
The ammonia water pipe 64 further comprises a filter screen four 641, a vertical plate 642, a transverse plate 643, a supporting rod 644, a telescopic cylinder 645 and a moving block 646; the filter screen IV 641 is arranged in the ammonia water pipe 64; the ammonia water pipe 64 is provided with a section of downward convex low-lying pipeline, the vertical plate 642 is installed on the low-lying pipeline of the ammonia water pipe 64, the vertical plate 642 is provided with a second groove, and the vertical plate 642 is communicated with the second groove; the transverse plate 643 is hinged to the vertical plate 642, and a first groove is formed in the transverse plate 643; one end of the supporting rod 644 is movably arranged in a first groove of the transverse plate 643, and the other end of the supporting rod 644 is movably arranged in a second groove of the vertical plate 642; a hollow cavity is formed in the vertical plate 642 and is communicated with the second groove; the telescopic cylinder 645 is positioned in a hollow cavity in the vertical plate 642; the moving block 646 is located in the second groove, the moving block 646 is mounted on the telescopic cylinder 645, and the moving block 646 is further fixedly connected with the support rod 644. During operation, the filter screen three 54 removes impurities and dust in the flue gas, the impurities fall into the ammonia water pipe 64, when the impurities pass through the filter screen four 641, the impurities are blocked by the filter screen four 641, the impurities fall into the low-lying channel of the ammonia water pipe 64, when the impurities are accumulated to a certain amount, the telescopic air cylinder 645 works to push the moving block 646 upwards, the moving block 646 drives the supporting rod 644 to move upwards, the supporting rod 644 props up the transverse plate 643 to seal the low-lying channel of the ammonia water pipe 64, and then the impurities are discharged.
The catalyst supplementing module 8 comprises a stirring bar 81, a first electromagnet 82, a second electromagnet 83, a hollow rod 84, fan blades 85, a bearing and a hose 86; the stirring strip 81 is positioned in an annular groove on the side wall of the box body 1, and a triangular bulge is arranged on the lower surface of the stirring strip 81; the first electromagnet 82 is embedded on the stirring strip 81; the second electromagnet 83 is arranged at the bottom of the annular groove on the side wall of the box body 1, and the second electromagnet 83 is annular; the hollow rod 84 is arranged on the stirring bar 81; the fan blades 85 are arranged on the hollow rod 84; the bearing is mounted at the upper end of the hollow rod 84; the hose 86 is sleeved on the outer ring of the bearing. When the device works, when the surface layer of the catalyst particles fails, the first electromagnet 82 and the second electromagnet 83 are powered off, the stirring strip 81 moves downwards under the action of self gravity, the hollow rod 84 moves downwards with the stirring strip 81 at the same time, the flue gas enables the fan blades 85 to rotate, the fan blades 85 drive the stirring strip 81 to rotate, the stirring strip 81 stirs the catalyst on the filter screen module 7, the failed part of the surface layer of the catalyst particles is scraped, and the scraped surface layer of the catalyst falls down through the filter screen module 7; when catalyst particles almost lose the catalysis function, the diameter of the catalyst particles becomes small, the position of the second filter screen 72 is adjusted by the screw 74, the filter screen holes of the second filter screen 72 are aligned to the filter screen holes of the first filter screen 71, the catalyst particles are completely discharged, the catalyst particles are added through the hollow rod 84, after the catalyst particles are added, the catalyst can be uniformly tiled by the stirring bar 81, the first electromagnet 82 and the second electromagnet 83 are electrified, and the second electromagnet 83 and the first electromagnet 82 repel each other, so that the stirring bar 81 moves upwards.
The specific working process is as follows:
flue gas of a thermal power plant enters from a flue gas inlet 2, ammonia water enters from an ammonia water inlet pipe 3, the flue gas enters into a dust removal module 5, a first motor is started, the first motor drives a driving wheel 52 to rotate, the driving wheel 52 drives a third filter screen 54 to rotate, and the third filter screen 54 removes dust and impurities in the flue gas;
meanwhile, the second tooth block 63 on the roller 62 is meshed with the first tooth block 55 on the filter screen 54 to drive the roller 62 to roll, so that ammonia water is pushed out of the ammonia water pipe 64 and is sprayed out of the spherical nozzle 65; the ammonia water is sprayed out of the round hole I of the spherical nozzle 65, when the ammonia water is sprayed out, the floating ball 66 in the round hole I is shaken, the floating ball 66 drives the guide plate 69 to swing, the spraying range of the ammonia water is larger, the ammonia water is mixed with the flue gas, and the ammonia water is evaporated into ammonia gas due to the high temperature of the flue gas; the third filter screen 54 removes impurities and dust in the flue gas, the impurities fall into the ammonia water pipe 64, when the impurities pass through the fourth filter screen 641, the impurities are blocked by the fourth filter screen 641, the impurities fall into a low-lying channel of the ammonia water pipe 64, when the impurities are accumulated to a certain amount, the telescopic air cylinder 645 works to push the moving block 646 upwards, the moving block 646 drives the supporting rod 644 to move upwards, the supporting rod 644 props up the transverse plate 643 to seal the low-lying channel of the ammonia water pipe 64, and then the impurities are discharged;
when the catalyst particle surface layer fails, the first electromagnet 82 and the second electromagnet 83 are powered off, the stirring strip 81 moves downwards under the action of self gravity, the hollow rod 84 moves downwards with the stirring strip 81 at the same time, the flue gas enables the fan blades 85 to rotate, the fan blades 85 drive the stirring strip 81 to rotate, the stirring strip 81 stirs the catalyst on the filter screen module 7, the failed part of the catalyst particle surface layer is scraped, and the scraped catalyst surface layer falls down through the filter screen module 7; when the catalyst particles almost completely lose the catalytic function and the diameter of the catalyst particles is reduced, the position of the second filter screen 72 is adjusted by using the screw 74, so that the filter screen holes of the second filter screen 72 are aligned with the filter screen holes of the first filter screen 71, the catalyst particles are completely discharged, the catalyst particles are added through the hollow rod 84, and after the catalyst particles are added, the catalyst can be uniformly spread by the stirring bar 81; then, the first electromagnet 82 and the second electromagnet 83 are electrified, and the second electromagnet 83 and the first electromagnet 82 repel each other, so that the stirring bar 81 moves upward.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present invention, or modify equivalent embodiments, using the methods and techniques disclosed above, without departing from the scope of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (6)
1. An SCR denitration device for a thermal power plant comprises a box body (1), a flue gas inlet (2), an ammonia water inlet pipe (3), a flue gas outlet (4), a dust removal module (5), an ammonia water spraying module (6), a filter screen module (7) and a catalyst supplement module (8); a flue gas inlet (2) is arranged at the left side of the box body (1); the ammonia water inlet pipe (3) is positioned below the flue gas inlet (2); the top of the box body (1) is provided with a flue gas outlet (4); the dust removal module (5) is positioned in the flue gas inlet (2), and the dust removal module (5) is used for removing dust from flue gas; the ammonia water spraying module (6) is arranged on the ammonia water inlet pipe (3), and the ammonia water spraying module (6) is used for spraying ammonia water to be mixed with flue gas; the filter screen module (7) is arranged in the box body (1); the catalyst replenishing module (8) is positioned above the filter screen module (7), a circular groove is formed in the side wall of the box body (1), and the catalyst replenishing module (8) is slidably mounted in the circular groove; the method is characterized in that: the filter screen module (7) comprises a first filter screen (71), a second filter screen (72), a fixed block (73) and a screw (74); the first filter screen (71) is fixedly arranged on the inner wall of the box body (1); the fixed block (73) is fixedly arranged on the inner wall of the box body (1); the second filter screen (72) is positioned below the first filter screen (71), the second filter screen (72) is placed on the fixed block (73), a threaded hole is formed in the right side of the second filter screen (72), and the diameter of the filter screen hole of the second filter screen (72) is larger than that of the filter screen hole of the first filter screen (71); the screw (74) penetrates through the side wall of the box body (1) and is installed in a threaded hole of the second filter screen (72), and the screw (74) is used for enabling the second filter screen (72) to move left and right; wherein,
a first limiting block and a second limiting block are arranged on the screw (74); the limiting block is positioned inside the box body (1); the second limiting block is positioned outside the box body (1); the first limiting block and the second limiting block are matched to enable the screw (74) to rotate without moving left and right.
2. The SCR denitration device for the thermal power plant according to claim 1, characterized in that: the dust removal module (5) comprises a motor I, a driving wheel (52), a driven wheel (53), a filter screen III (54) and a tooth block I (55); the driving wheel (52) is arranged on a motor shaft of the motor I, the ammonia water inlet pipe (3) is provided with an opening, and the driving wheel (52) is positioned in the ammonia water inlet pipe (3); the driven wheel (53) is rotatably arranged on the side wall of the box body (1); the third filter screen (54) is sleeved on the driving wheel (52) and the driven wheel (53); the first tooth blocks (55) are uniformly arranged on the third filter screen (54).
3. The SCR denitration device for the thermal power plant according to claim 1, characterized in that: the ammonia water spraying module (6) comprises a rolling shaft (62), a second tooth block (63), an ammonia water pipe (64) and a spherical nozzle (65); the roller (62) is positioned inside the ammonia water inlet pipe (3); the second tooth blocks (63) are uniformly arranged on the rolling shaft (62); the ammonia water pipe (64) is connected to the ammonia water inlet pipe (3), and the ammonia water pipe (64) guides ammonia water to the flue gas inlet (2); the spherical nozzle (65) is arranged on the ammonia water pipe (64) through a branch pipe, and a first round hole is formed in the spherical nozzle (65).
4. The SCR denitration device for the thermal power plant according to claim 3, characterized in that: the spherical nozzle (65) further comprises a floating ball (66), a first spring (67), a second spring (68) and a guide plate (69); one end of the first spring (67) is mounted on the inner wall of the first round hole; one end of the second spring (68) is arranged on the inner wall of the first round hole; the floating ball (66) is arranged at the other ends of the first spring (67) and the second spring (68); the guide plate (69) is arranged on the floating ball (66), and the guide plate (69) penetrates through the first round hole.
5. The SCR denitration device for the thermal power plant according to claim 3, characterized in that: the ammonia water pipe (64) also comprises a filter screen IV (641), a vertical plate (642), a transverse plate (643), a support rod (644), a telescopic cylinder (645) and a moving block (646); the filter screen IV (641) is arranged in the ammonia water pipe (64); the ammonia water pipe (64) is provided with a section of downward-convex low-lying pipeline, the vertical plate (642) is installed on the low-lying pipeline of the ammonia water pipe (64), the vertical plate (642) is provided with a second groove, and the vertical plate (642) is communicated with the second groove; the transverse plate (643) is hinged to the vertical plate (642), and a first groove is formed in the transverse plate (643); one end of the supporting rod (644) is movably arranged in a first groove of the transverse plate (643), and the other end of the supporting rod (644) is movably arranged in a second groove of the vertical plate (642); a hollow cavity is formed in the vertical plate (642), and the hollow cavity is communicated with the second groove; the telescopic cylinder (645) is positioned in a hollow cavity in the vertical plate (642); the moving block (646) is positioned in the second groove, the moving block (646) is arranged on the telescopic cylinder (645), and the moving block (646) is fixedly connected with the supporting rod (644).
6. The SCR denitration device for the thermal power plant according to claim 1, characterized in that: the catalyst supplementing module (8) comprises a stirring bar (81), a first electromagnet (82), a second electromagnet (83), a hollow rod (84), fan blades (85), a bearing and a hose (86); the stirring strip (81) is positioned in an annular groove on the side wall of the box body (1), and a triangular protrusion is arranged on the lower surface of the stirring strip (81); the electromagnet I (82) is embedded on the stirring strip (81); the second electromagnet (83) is arranged at the bottom of the annular groove in the side wall of the box body (1), and the second electromagnet (83) is annular; the hollow rod (84) is arranged on the stirring bar (81); the fan blades (85) are arranged on the hollow rod (84); the bearing is arranged at the upper end of the hollow rod (84); the hose (86) is sleeved on the outer ring of the bearing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810603456.5A CN108704475A (en) | 2018-06-12 | 2018-06-12 | A kind of thermoelectricity station-service SCR denitration device |
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| CN201810603456.5A CN108704475A (en) | 2018-06-12 | 2018-06-12 | A kind of thermoelectricity station-service SCR denitration device |
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| CN108704475A true CN108704475A (en) | 2018-10-26 |
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| CN201810603456.5A Pending CN108704475A (en) | 2018-06-12 | 2018-06-12 | A kind of thermoelectricity station-service SCR denitration device |
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| CN112546862A (en) * | 2020-11-20 | 2021-03-26 | 盐城市兰丰环境工程科技有限公司 | SCR low temperature denitrification facility |
| CN113117516A (en) * | 2019-12-31 | 2021-07-16 | 中国石油化工股份有限公司 | SCR denitration reactor with ash removal device |
| LU501564A1 (en) * | 2022-03-01 | 2022-09-01 | Yancheng City Lan Feng Env Engineering Co Ltd | Scr low-temperature denitration device |
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Application publication date: 20181026 |