CN113578049A - Dedusting and denitration system and dedusting and denitration method - Google Patents

Dedusting and denitration system and dedusting and denitration method Download PDF

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Publication number
CN113578049A
CN113578049A CN202110732305.1A CN202110732305A CN113578049A CN 113578049 A CN113578049 A CN 113578049A CN 202110732305 A CN202110732305 A CN 202110732305A CN 113578049 A CN113578049 A CN 113578049A
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denitration
dust
air
pipe
dust removal
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高麟
蒋敏
蒲柏林
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Intermet Technology Chengdu Co Ltd
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Intermet Technology Chengdu Co Ltd
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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
    • B01D53/74—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
    • B01D46/24—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies
    • B01D46/2403—Particle separators, e.g. dust precipitators, using rigid hollow filter bodies characterised by the physical shape or structure of the filtering element
    • B01D46/2411—Filter cartridges
    • 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
    • B01D46/54—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms
    • B01D46/543—Particle separators, e.g. dust precipitators, using ultra-fine filter sheets or diaphragms using membranes
    • 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

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  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Health & Medical Sciences (AREA)
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  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
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Abstract

The invention discloses a dust removal and denitration system and a dust removal and denitration method. The dedusting and denitration system comprises a dedusting device and a denitration device, wherein the dedusting device comprises two dedusting units which are arranged side by side at intervals, an air inlet channel and an air outlet channel are distributed between the two dedusting units from bottom to top, the dedusting units are provided with a raw air cavity and a purified air cavity which are distributed from bottom to top, the gas to be filtered sequentially passes through the air inlet channel and the raw air cavity to obtain the dust-free gas entering the purified air cavity, the denitration device comprises an ammonia spraying unit, the ammonia spraying unit is arranged on the air inlet channel of the dedusting device, an ammonia source sprayed by the ammonia spraying unit is mixed with the gas to be filtered in the air inlet channel and then enters the dedusting device, and the filtered dust-free gas then enters the denitration unit; the denitration units are arranged on the top plates of the two dust removal units respectively, through holes for communicating the denitration units with the air purification cavity are formed in the top plates, and dust-free air in the air purification cavity passes through the through holes and then enters the denitration units. The invention has the advantages of fully mixing the dust-free gas and the ammonia source and good denitration effect.

Description

Dedusting and denitration system and dedusting and denitration method
Technical Field
The invention relates to the technical field of dust removal and denitration, in particular to a dust removal and denitration system and a dust removal and denitration method.
Background
The purpose of SCR denitration is to remove nitrogen oxides from a gas by reacting the nitrogen oxides with an ammonia source (typically ammonia gas) in the presence of an SCR denitration catalyst to form nitrogen gas and water. In order to enhance the denitration effect, one way is to enhance the mixing effect of the ammonia source and the gas. Therefore, the applicant of the present application filed chinese patent application No. 2021101021289 entitled flue gas dust removal and denitration device, and chinese utility model patent application No. 2020229541730 entitled dust removal and denitration integrated device and dust removal system formed thereby.
In the two devices, the dust-free gas in the clean gas chamber of the dust removal device is input into the SCR reaction zone at the side of the dust removal device through a pipeline, and the ammonia source injection zone is arranged on the pipeline for conveying the dust-free gas.
Disclosure of Invention
On the first hand, in order to fully mix the dust-free gas and the ammonia source before entering the SCR reaction zone, a complex split-flow type flow guide structure is arranged in the pipeline, so that the installation is complex, and the flow resistance of the gas can be increased; therefore, the invention mainly aims to provide a dedusting and denitration system to solve the technical problem that dust-free gas and an ammonia source are not easy to be fully mixed in the prior art.
In the second aspect, the SCR reaction zone is arranged at the side of the dust removal device, so that the occupied area of the whole dust removal and denitration system is large, and the arrangement of the pipeline enables the temperature of the dust-free gas to be reduced greatly, so that the activity of the SCR catalyst is difficult to fully show, and the denitration effect is poor; therefore, the invention mainly aims to provide a dedusting and denitration system to solve the technical problems of large occupied area and poor denitration effect of the system in the prior art.
In a third aspect, the present invention provides a dust removal and denitration system and method, so as to solve the technical problems of large occupied area, poor denitration effect, and difficulty in fully mixing the dust-free gas and the ammonia source in the prior art.
In order to achieve the above object, according to a first aspect of the present invention, a dust-removing and denitration system is provided. The technical scheme is as follows:
the dedusting and denitration system comprises a dedusting device and a denitration device, wherein the denitration device is provided with a denitration unit and an ammonia spraying unit, the ammonia spraying unit is arranged on an air inlet channel of the dedusting device, an ammonia source sprayed by the ammonia spraying unit is mixed with gas to be filtered in the air inlet channel and then enters the dedusting device, and dust-free gas obtained after filtering enters the denitration unit.
Further, the ammonia injection unit comprises an ammonia injection assembly, and the ammonia injection assembly comprises: the height of the vertical pipe is matched with that of the air inlet channel; the air outlet end of the air inlet pipe is connected with the vertical pipe; the air inlet end of the air outlet pipe is connected with the vertical pipe, the air outlet pipe is arranged at least at intervals, and the air outlet pipe is provided with nozzle assemblies arranged at intervals.
Further, the nozzle assembly comprises a first nozzle and a second nozzle facing the inlet of the air intake channel and symmetrically distributed along a horizontal plane.
Furthermore, the included angle between the first nozzle and the second nozzle is 30-50 degrees.
Further, the ammonia injection unit comprises at least two ammonia injection assemblies.
Further, the air inlet pipes are arranged at intervals from top to bottom.
Furthermore, a first bent pipe, a vertical middle pipe, a second bent pipe and a horizontal middle pipe are sequentially arranged between the air inlet pipe and the vertical pipe.
Further, the distance between two adjacent air outlet pipes is 45-65 cm.
Furthermore, the outlet duct is two rows and distributes in the radial both sides of vertical pipe, and the length of outlet duct is 0.3 ~ 1.2 m.
Further, the air purifier also comprises a manifold, and the manifold is connected with the air inlet pipe.
In order to achieve the above object, according to a second aspect of the present invention, there is provided a dust-removing and denitration system. The technical scheme is as follows:
the dedusting and denitration system comprises a dedusting device and a denitration device, wherein the dedusting device comprises two dedusting units which are arranged side by side at intervals, an air inlet channel and an air outlet channel are distributed between the two dedusting units from bottom to top, the dedusting units are provided with an original air cavity and an air purification cavity which are distributed from bottom to top, the to-be-filtered air sequentially passes through the air inlet channel and the original air cavity to obtain dust-free air entering the air purification cavity, the denitration device comprises two denitration units which are respectively arranged on top plates of the two dedusting units, through holes which enable the denitration units to be communicated with the air purification cavity are formed in the top plates, the dust-free air in the air purification cavity passes through the through holes to enter the denitration units, and the denitrated clean air is discharged from the air outlet channel.
Furthermore, the dust removal unit comprises an ash bin arranged below the original air cavity, and a gap communicated with the air inlet channel is formed between the inner edge of the top of the ash bin and the inner edge of the bottom of the original air cavity.
Further, the denitration unit is arranged in the middle of the top plate.
Further, the cross-sectional area of the intake passage decreases in the gas flow direction.
Furthermore, the opening directions of the air inlet channel and the air outlet channel face to the same side of the dust removal device.
Furthermore, a back-blowing channel is arranged between the air inlet channel and the air outlet channel, and two groups of back-blowing air bags for back-blowing the two dust removing units respectively are arranged in the back-blowing channel; and/or a back-blowing air bag and a rain shed are arranged outside the dust removal unit.
Furthermore, the dust-free gas from the gas purification cavity passes through the catalyst filling layer from bottom to bottom in the denitration unit, and the obtained clean gas flows downwards into the gas outlet channel and is discharged.
Further, the denitration unit is equipped with the catalyst filling layer including denitration portion, canalis spinalis, first arc pipe, horizontal pipe and the second arc pipe that sets gradually, denitration portion, and denitrification facility still has and is responsible for, is responsible for one end and two second arc union couplings, and the other end is connected with air outlet channel.
Furthermore, the length of the dust removal unit is more than or equal to 18m, the width of the dust removal unit is more than or equal to 15m, and the height of the dust removal unit is more than or equal to 18 m; the width of inlet channel and outlet channel is 2 ~ 4m, and one end height is 4 ~ 6m, and the other end height is 1 ~ 2 m.
Furthermore, the outer parts of the dust removal device and the denitration device are provided with terraces which are distributed at intervals in the vertical direction and steps for connecting two adjacent terraces.
In order to achieve the above object, according to a third aspect of the present invention, a dust-removing and denitration system and method are provided. The technical scheme is as follows:
dust removal deNOx systems, including dust collector and denitrification facility, wherein, dust collector includes two dust removal units that the interval set up side by side, and it has inlet channel and outlet channel to distribute by lower supreme between two dust removal units, and dust removal unit has former air cavity and net gas chamber by lower supreme distribution, treats that filtered gas obtains the dustless gas that gets into the net gas chamber after inlet channel and former air cavity in proper order, denitrification facility includes: the ammonia spraying unit is arranged on an air inlet channel of the dust removal device, an ammonia source sprayed by the ammonia spraying unit is mixed with the gas to be filtered in the air inlet channel and then enters the dust removal device, and the filtered dust-free gas enters the denitration unit; the denitration units are two and are respectively arranged on the top plates of the two dust removal units, through holes for communicating the denitration units with the air purification cavity are formed in the top plates, dust-free air in the air purification cavity passes through the through holes and then enters the denitration units, and the denitrated clean air is discharged from the air outlet channel.
Furthermore, the dust removal unit comprises an ash bin arranged below the original air cavity, and a gap communicated with the air inlet channel is formed between the inner edge of the top of the ash bin and the inner edge of the bottom of the original air cavity; and/or the denitration unit is arranged in the middle of the top plate.
Further, the cross-sectional area of the intake passage decreases in the gas flow direction; and/or the opening directions of the air inlet channel and the air outlet channel face the same side of the dust removal device.
Furthermore, a back-blowing channel is arranged between the air inlet channel and the air outlet channel, and two groups of back-blowing air bags for back-blowing the two dust removing units respectively are arranged in the back-blowing channel; and/or a back-blowing air bag and a rain shed are arranged outside the dust removal unit.
Further, the denitration unit is equipped with the catalyst filling layer including denitration portion, canalis spinalis, first arc pipe, horizontal pipe and the second arc pipe that sets gradually, denitration portion, and denitrification facility still has and is responsible for, is responsible for one end and two second arc union couplings, and the other end is connected with air outlet channel.
Further, the ammonia injection unit comprises an ammonia injection assembly, and the ammonia injection assembly comprises: the height of the vertical pipe is matched with that of the air inlet channel; the air outlet end of the air inlet pipe is connected with the vertical pipe; the air inlet end of the air outlet pipe is connected with the vertical pipe, the air outlet pipe is arranged at least at intervals, and the air outlet pipe is provided with nozzle assemblies arranged at intervals.
Further, the nozzle assembly comprises a first nozzle and a second nozzle which face the inlet of the air inlet channel and are symmetrically distributed along a horizontal plane, and the included angle between the first nozzle and the second nozzle is preferably 30-50 degrees; and/or the ammonia injection unit comprises at least two ammonia injection assemblies.
Furthermore, the air inlet pipes are arranged at intervals from top to bottom; and/or a first bent pipe, a vertical middle pipe, a second bent pipe and a horizontal middle pipe are sequentially arranged between the air inlet pipe and the vertical pipe.
Further, the distance between two adjacent air outlet pipes is 45-65 cm; and/or the air outlet pipes are arranged in two rows and distributed on two radial sides of the vertical pipe, and the length of each air outlet pipe is 0.3-1.2 m.
The dedusting and denitration method adopts the dedusting and denitration system.
The invention is further described with reference to the following figures and detailed description. Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to assist in understanding the invention, and are included to explain the invention and their equivalents and not limit it unduly. In the drawings:
FIG. 1 is a schematic structural diagram of a first embodiment of a dedusting and denitration system of the present invention.
FIG. 2 is a rear view of an ammonia injection unit in the first embodiment of the dedusting and denitration system of the present invention.
Fig. 3 is a sectional view taken along line a-a of fig. 2.
FIG. 4 is a front view of a second embodiment of the dedusting and denitration system of the present invention.
FIG. 5 is a side view of a second embodiment of the dust-removing and denitration system of the present invention.
Fig. 6 is a sectional view taken along line B-B of fig. 5.
Fig. 7 is a sectional view taken along line C-C of fig. 5.
Fig. 8 is a sectional view taken along line D-D of fig. 5.
FIG. 9 is a schematic structural diagram of a third embodiment of a dedusting and denitration system of the present invention.
The relevant references in the above figures are:
100-dust removal unit, 110-air inlet channel, 111-clapboard, 120-air outlet channel, 130-filtering element, 140-ash bin, 210-blowback air bag, 220-terrace, 230-ladder, 240-canopy, 300-ammonia spraying unit, 310-vertical pipe, 320-air inlet pipe, 330-air outlet pipe, 340-header pipe, 351-first elbow pipe, 352-vertical middle pipe, 353-second elbow pipe, 354-horizontal middle pipe, 360-nozzle assembly, 361-first nozzle, 362-second nozzle, 400-denitration unit, 410-denitration part, 420-cone pipe, 430-first arc pipe, 440-horizontal pipe, 450-second arc pipe and 460-main pipe.
Detailed Description
The invention will be described more fully hereinafter with reference to the accompanying drawings. Those skilled in the art will be able to implement the invention based on these teachings. Before the present invention is described in detail with reference to the accompanying drawings, it is to be noted that:
the technical solutions and features provided in the present invention in the respective sections including the following description may be combined with each other without conflict.
Moreover, the embodiments of the present invention described in the following description are generally only some embodiments of the present invention, and not all embodiments. Therefore, all other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort shall fall within the protection scope of the present invention.
With respect to terms and units in the present invention. The terms "comprising," "having," and any variations thereof in the description and claims of this invention and the related sections are intended to cover non-exclusive inclusions.
FIG. 1 is a schematic structural diagram of a first embodiment of a dedusting and denitration system of the present invention. FIG. 2 is a rear view of an ammonia injection unit 300 in the first embodiment of the dust-removing and denitration system of the present invention. Fig. 3 is a sectional view taken along line a-a of fig. 2.
As shown in fig. 1-3, the dedusting and denitration system comprises a dedusting device and a denitration device; the denitration device is provided with a denitration unit 400 and an ammonia spraying unit 300, the ammonia spraying unit 300 is arranged on the air inlet channel 110 of the dust removal device, an ammonia source sprayed by the ammonia spraying unit 300 is mixed with the gas to be filtered in the air inlet channel 110 and then enters the dust removal device, and the filtered dust-free gas enters the denitration unit 400; the outlet end of the header pipe 340 is connected with the inlet pipe 320, and the inlet end is connected with the ammonia source storage tank. Therefore, the ammonia source is sprayed into the gas to be filtered before the gas to be filtered enters the dust removal device, so that the ammonia source and the gas to be filtered are fully contacted in the flowing process in the dust removal device, the obtained dust-free gas enables the ammonia source to be dispersed and particularly uniform before entering the denitration device, and a complex shunting type flow guide structure is not required to be arranged.
When the ammonia injection unit 300 is used as follows, the initial mixing of the ammonia source with the gas to be filtered is most effective. The ammonia injection unit 300 comprises an ammonia injection assembly, and the ammonia injection assembly comprises a vertical pipe 310, an air inlet pipe 320, an air outlet pipe 330 and a header pipe 340; the height of the vertical tube 310 matches the height of the air intake passage 110; the air outlet end of the air inlet pipe 320 is connected with the vertical pipe 310; the air inlet end of the air outlet pipe 330 is connected with the vertical pipe 310, the air outlet pipe 330 is at least arranged at intervals, and the air outlet pipe 330 is provided with nozzle assemblies 360 arranged at intervals.
The nozzle assembly 360 includes a first nozzle 361 and a second nozzle 362 facing the inlet of the air inlet passage 110 and symmetrically distributed along a horizontal plane, and an included angle theta between the first nozzle 361 and the second nozzle 362 is 30-50 deg. Thereby, the initial mixing effect of the ammonia source and the gas to be filtered is further improved.
The ammonia injection unit 300 may be made to include at least two ammonia injection modules depending on the size of the recent passage. Therefore, disassembly, assembly and maintenance are convenient.
The air inlets 320 are spaced from top to bottom. From this, help promoting the homogeneity that nozzle assembly 360 was given vent to anger, and then promote the ammonia source and wait to filter the initial mixed effect of gas.
A first elbow pipe 351, a vertical middle pipe 352, a second elbow pipe 353 and a horizontal middle pipe 354 are sequentially arranged between the air inlet pipe 320 and the vertical pipe 310. Thus, the arrangement of the ammonia gas can be performed by adjusting the orientation of the second bend 353 and the length of the first bend 351, and particularly, the arrangement of the ammonia gas can be performed when the ammonia injection unit 300 has a plurality of ammonia injection assemblies.
The distance D1 between two adjacent upper and lower air outlet pipes 330 is 45-65 cm. Thus, it is possible to prevent an increase in gas flow resistance due to the dense arrangement of the outlet pipe 330 while ensuring an initial mixing effect of the ammonia source with the gas to be filtered.
The outlet pipes 330 are arranged in two rows and distributed on two radial sides of the vertical pipe 310, and the length D2 of the outlet pipes 330 is 0.3-1.2 m. Therefore, the structure of the ammonia injection assembly is simplified, the manufacturing cost is reduced, and the ammonia injection effect is ensured.
FIG. 4 is a front view of a second embodiment of the dedusting and denitration system of the present invention. FIG. 5 is a side view of a second embodiment of the dust-removing and denitration system of the present invention. Fig. 6 is a sectional view taken along line B-B of fig. 5. Fig. 7 is a sectional view taken along line C-C of fig. 5. Fig. 8 is a sectional view taken along line D-D of fig. 5.
As shown in fig. 4-8, the dust-removing and denitration system comprises a dust-removing device and a denitration device; the dust removal device comprises two dust removal units 100 which are arranged side by side at intervals, an air inlet channel 110 and an air outlet channel 120 are distributed between the two dust removal units 100 from bottom to top, the dust removal units 100 are provided with a raw air cavity and a purified air cavity which are distributed from bottom to top, and the gas to be filtered sequentially passes through the air inlet channel 110 and the raw air cavity to obtain the dust-free gas entering the purified air cavity; the denitration device comprises two denitration units 400 respectively arranged on the top plates of the two dust removal units 100, through holes for communicating the denitration units 400 with the air purification chamber are arranged on the top plates, dust-free air in the air purification chamber passes through the through holes and then enters the denitration units 400, and the denitrated clean air is discharged from the air outlet channel 120. Therefore, the denitration device is placed on the top plate of the box body of the dust removal device, the dust-free gas obtained by the dust removal device directly enters the denitration device, a pipeline is not required to be arranged, the gas temperature drop is small, and the denitration catalyst can exert a catalytic effect; the catalytic effect is improved, so that the catalyst area is saved; because no pipeline is needed, the direction of the air outlet channel 120 can be adaptively adjusted to save the occupied land; the land occupation of a denitration device is saved; the gas is directly taken from the top of the dust removal device, and the gas flow is more uniform.
In the application number 2020229541730, which is named as a dust removal and denitration integrated device and a dust removal system formed by the same, gas to be filtered in the gas inlet channel 110 is connected with the ash bin 140 through a pipeline, and ash is easily accumulated in the pipeline. In the present invention, the dust removing unit 100 includes an ash bin 140 disposed below the original air cavity, and a gap communicated with the air inlet channel 110 is formed between an inner edge of the top of the ash bin 140 and an inner edge of the bottom of the original air cavity, so that the gas to be filtered directly enters the ash bin 140 from the gap, and ash accumulation is not easily caused.
Denitration unit 400 is equipped with the catalyst filling layer including denitration portion 410, canalis spinalis 420, first arc pipe 430, horizontal pipe 440 and the second arc pipe 450 that sets gradually in denitration portion 410, and denitrification facility still has and is responsible for 460, and the one end of being responsible for 460 is connected with two second arc pipes 450, and the other end is connected with outlet channel 120. Therefore, the dust-free gas from the clean gas chamber passes through the catalyst-filled layer from below in the denitration unit 400, and the obtained clean gas flows down into the gas outlet channel 120 and is discharged.
Because the catalytic efficiency of the catalyst is high, the area of the catalyst is small, and the projected area of the catalyst is usually significantly smaller than the projected area of the ash bin 140, and therefore, in order to improve the uniformity of the airflow, the denitration unit 400 is disposed in the middle of the top plate. In specific implementation, the catalyst filling layers are at least two and are arranged at intervals up and down, and each catalyst filling layer is formed by overlapping a plurality of layers of carriers loaded with denitration catalysts.
A partition 111 disposed at an angle to the horizontal is provided in the gas inlet passage 110, so that the cross-sectional area of the gas inlet passage 110 decreases in the gas flow direction. Therefore, the uniformity of the flow field distribution of the gas is improved.
In the traditional dedusting and denitration system, because the denitration device is arranged at the rear end of the dedusting device, the opening directions of the air inlet channel 110 and the air outlet channel 120 are usually opposite, so that the occupied area of the system is extremely large; in the present invention, since the denitration device is disposed on the top plate of the dust removing device, the opening directions of the inlet channel 110 and the outlet channel 120 may face the same side of the dust removing device.
A back-blowing channel is arranged between the air inlet channel 110 and the air outlet channel 120, and two back-blowing air bags 210 for back-blowing the two dust removing units 100 respectively are arranged in the back-blowing channel; further, a blowback air bag 210 and a canopy 240 are provided outside the dust removing unit 100. Therefore, the back flushing effect can be obviously improved for a large dust removal device.
The length L1 of the dust removal unit 100 is more than or equal to 18m, the width L2 is more than or equal to 15m, and the height L3 is more than or equal to 18 m; the width S1 of the air inlet channel 110 and the air outlet channel 120 is 2-4 m, the height S2 of one end is 4-6 m, and the height S3 of the other end is 1-2 m. The terraces 220 distributed at vertical intervals and the ladder 230 connecting the two adjacent terraces 220 are arranged outside the dust removal device and the denitration device, so that the system is convenient to overhaul.
The denitration device further includes an ammonia injection unit 300, and the ammonia injection unit 300 is provided between the top plate of the dust removal device and the catalyst-packed layer, and has the structure shown in fig. 2 to 3.
FIG. 9 is a schematic structural diagram of a third embodiment of a dedusting and denitration system of the present invention.
As shown in fig. 9, the dust-removing and denitration system includes a dust-removing device and a denitration device; the dust removal device comprises two dust removal units 100 which are arranged side by side at intervals, an air inlet channel 110 and an air outlet channel 120 are distributed between the two dust removal units 100 from bottom to top, the dust removal units 100 are provided with a raw air cavity and a purified air cavity which are distributed from bottom to top, and the gas to be filtered sequentially passes through the air inlet channel 110 and the raw air cavity to obtain the dust-free gas entering the purified air cavity; the denitration device comprises an ammonia spraying unit 300 and a denitration unit 400; the ammonia spraying unit 300 is arranged on the air inlet channel 110 of the dust removal device, an ammonia source sprayed by the ammonia spraying unit 300 is mixed with the gas to be filtered in the air inlet channel 110 and then enters the dust removal device, and the filtered dust-free gas enters the denitration unit 400; the two denitration units 400 are respectively arranged on the top plates of the two dust removal units 100, through holes for communicating the denitration units 400 with the air purification chamber are arranged on the top plates, dust-free air in the air purification chamber passes through the through holes and then enters the denitration units 400, and the denitrated clean air is discharged from the air outlet channel 120.
The ammonia injection unit 300 has a structure shown in fig. 2 to 3, and the denitration unit 400 has a structure shown in fig. 4 to 8.
Therefore, the dust removal and denitration system of the third embodiment has the advantages of the first and second dust removal and denitration systems.
The dedusting and denitration method for dedusting and denitration of gas by adopting the dedusting and denitration system of any one of the embodiments has the advantages of simple process, high denitration rate and the like.
In the above dedusting and denitrating system and dedusting and denitrating method, when the filter element 130 of the dedusting device is a filter tube made by rolling a metal film, the target of action can be high-temperature dusty gas with the temperature less than or equal to 500 ℃.
The contents of the present invention have been explained above. Those skilled in the art will be able to implement the invention based on these teachings. All other embodiments, which can be derived by a person skilled in the art from the above description without inventive step, shall fall within the scope of protection of the present invention.

Claims (10)

1. Dust removal deNOx systems, including dust collector and denitrification facility, wherein, dust collector includes two dust removal unit (100) that the interval set up side by side, it has inlet channel (110) and outlet channel (120) to distribute by lower supreme between two dust removal unit (100), dust removal unit (100) have by lower supreme distributed former air cavity and net gas cavity, treat that filtered gas obtains the dust-free gas that gets into the net gas cavity after inlet channel (110) and former air cavity in proper order, its characterized in that: the denitration device comprises:
the ammonia spraying unit (300) is arranged on the gas inlet channel (110) of the dust removal device, an ammonia source sprayed by the ammonia spraying unit (300) is mixed with gas to be filtered in the gas inlet channel (110) and then enters the dust removal device, and the filtered dust-free gas enters the denitration unit (400);
the denitration units (400) are two and are respectively arranged on the top plates of the two dust removal units (100), through holes for communicating the denitration units (400) with the air purification cavity are formed in the top plates, dust-free air in the air purification cavity passes through the through holes and then enters the denitration units (400), and the denitrated clean air is discharged from the air outlet channel (120).
2. The dust-removing and denitration system of claim 1, wherein: the dust removal unit (100) comprises an ash bin (140) arranged below the original air cavity, and a gap communicated with the air inlet channel (110) is formed between the inner edge of the top of the ash bin (140) and the inner edge of the bottom of the original air cavity; and/or the denitration unit (400) is arranged in the middle of the top plate.
3. The dust-removing and denitration system of claim 1, wherein: the cross-sectional area of the gas inlet channel (110) decreases progressively along the gas flow direction; and/or the opening directions of the air inlet channel (110) and the air outlet channel (120) face the same side of the dust removal device.
4. The dust-removing and denitration system of claim 1, wherein: a back-blowing channel is arranged between the air inlet channel (110) and the air outlet channel (120), and two back-blowing air bags (210) which respectively back-blow the two dust removal units (100) are arranged in the back-blowing channel; and/or a blowback air bag (210) and a rain shed (240) are arranged on the outer side of the dust removal unit (100).
5. The dust-removing and denitration system of claim 1, wherein: denitration unit (400) are equipped with the catalyst filling layer including denitration portion (410), canalis spinalis (420), first arc pipe (430), level pipe (440) and second arc pipe (450) that set gradually in denitration portion (410), and denitrification facility still has and is responsible for (460), is responsible for (460) one end and is connected with two second arc pipes (450), and the other end is connected with outlet channel (120).
6. The dust-removing and denitration system of claim 1, wherein: the ammonia injection unit (300) comprises an ammonia injection assembly comprising:
the height of the vertical pipe (310) is matched with that of the air inlet channel (110);
the air outlet end of the air inlet pipe (320) is connected with the vertical pipe (310);
the air inlet end of the air outlet pipe (330) is connected with the vertical pipe (310), the air outlet pipe (330) is at least arranged at intervals from the top, and the air outlet pipe (330) is provided with nozzle assemblies (360) which are arranged at intervals.
7. The dust-removing and denitration system of claim 1, wherein: the nozzle assembly (360) comprises a first nozzle (361) and a second nozzle (362) which face to the inlet of the air inlet channel (110) and are symmetrically distributed along a horizontal plane, and the included angle between the first nozzle (361) and the second nozzle (362) is preferably 30-50 degrees; and/or the ammonia injection unit (300) comprises at least two ammonia injection assemblies.
8. The dust-removing and denitration system of claim 1, wherein: the air inlet pipes (320) are arranged at intervals from top to bottom; and/or a first bent pipe (351), a vertical middle pipe (352), a second bent pipe (353) and a horizontal middle pipe (354) are sequentially arranged between the air inlet pipe (320) and the vertical pipe (310).
9. The dust-removing and denitration system of claim 1, wherein: the distance between two adjacent air outlet pipes (330) is 45-65 cm; and/or the air outlet pipes (330) are arranged in two rows and distributed at two radial sides of the vertical pipe (310), and the length of the air outlet pipe (330) is 0.3-1.2 m.
10. The dust removal and denitration method is characterized by comprising the following steps: the dust and denitration system of any one of claims 1 to 9.
CN202110732305.1A 2021-06-30 2021-06-30 Dedusting and denitration system and dedusting and denitration method Pending CN113578049A (en)

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