CN116474552A - Flue gas dust removal denitrification facility - Google Patents
Flue gas dust removal denitrification facility Download PDFInfo
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- CN116474552A CN116474552A CN202310640668.1A CN202310640668A CN116474552A CN 116474552 A CN116474552 A CN 116474552A CN 202310640668 A CN202310640668 A CN 202310640668A CN 116474552 A CN116474552 A CN 116474552A
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- Prior art keywords
- flue gas
- denitration
- dust
- dust removal
- component
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 139
- 239000003546 flue gas Substances 0.000 title claims abstract description 139
- 239000000428 dust Substances 0.000 title claims abstract description 108
- 239000003054 catalyst Substances 0.000 claims description 56
- 238000002347 injection Methods 0.000 claims description 30
- 239000007924 injection Substances 0.000 claims description 30
- 238000011084 recovery Methods 0.000 claims description 25
- 238000005507 spraying Methods 0.000 claims description 14
- 238000003860 storage Methods 0.000 claims description 13
- 239000007789 gas Substances 0.000 claims description 8
- 239000003638 chemical reducing agent Substances 0.000 claims description 5
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000011144 upstream manufacturing Methods 0.000 claims description 5
- 239000003795 chemical substances by application Substances 0.000 claims description 4
- 230000003009 desulfurizing effect Effects 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 2
- 230000008021 deposition Effects 0.000 abstract description 9
- 238000000034 method Methods 0.000 abstract description 4
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- 230000006978 adaptation Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 229910052783 alkali metal Inorganic materials 0.000 description 1
- 150000001340 alkali metals Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003670 easy-to-clean Effects 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000284 extract Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- -1 nonferrous Substances 0.000 description 1
- 239000002574 poison Substances 0.000 description 1
- 231100000614 poison Toxicity 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000009827 uniform distribution Methods 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
- B01D53/90—Injecting reactants
-
- 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
- B01D46/0027—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours with additional separating or treating functions
-
- 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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4263—Means for active heating or cooling
-
- 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
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/4281—Venturi's or systems showing a venturi effect
-
- 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
- B01D46/66—Regeneration of the filtering material or filter elements inside the filter
-
- 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
- B01D53/343—Heat recovery
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
-
- 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
- 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
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (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 provides a flue gas dust removal and denitration device, wherein a dust outlet of an air flue in the flue gas dust removal and denitration device is close to a flue gas outlet, namely, the deposition direction of dust in the air flue is the same as the airflow direction, the dust deposition does not influence the flow of flue gas, the phenomenon of secondary flying is eliminated, the dust deposition efficiency in the flue gas is higher, the air flue and a filter screen are subjected to dust removal by negative pressure suction force generated by a suction component, the occurrence of hardening phenomenon of the dust on the surface of the filter screen is greatly reduced by the negative pressure dust removal, and the problem of high-temperature flue gas temperature reduction caused in the dust removal process of the filter screen is further alleviated.
Description
Technical Field
The invention relates to the technical field of flue gas treatment, in particular to a flue gas dust removal and denitration device.
Background
Aiming at the problems that alkali metal and heavy metal are contained in flue gas in industries such as cement, nonferrous, chemical industry and the like, and the catalyst is easy to block, poison and lose efficacy, the dust-containing raw flue gas is purified by a dust remover under the working condition that the flue gas temperature is 280-420 ℃ and a large amount of dust is contained in the flue gas, and then the dust-free high-temperature flue gas enters an SCR denitration reactor for denitration, so that the SCR catalyst works in a cleaner flue gas environment. The high Wen Dichen denitration can reduce the abrasion of the catalyst, prolong the service life of the catalyst, reduce the running resistance of the flue gas and ensure the long-term stable running of the unit.
At present, a flue gas treatment device is generally provided with a tail gas inlet at the bottom and a tail gas outlet at the top, a dry filter bag area and a denitration area are arranged in a shell, and the tail gas passes through the dry filter bag area and then passes through the denitration area; the opening of the dry filter bag faces to the tail gas inlet, when the dry filter bag is used for a period of time, the dry filter bag needs to be cleaned, the dust cleaning mode is the blowing dust cleaning mode at present, the air source is normal-temperature compressed air, the compressed air with lower temperature is continuously blown in to cause the hardening of dust on the filter bag, the dust is not easy to clean, the temperature of high-temperature flue gas is also reduced, and the efficiency of denitration reaction is affected; the dust collecting component is arranged at the bottom of the equipment to contain the dust, so that air flow can only enter a dust removing area from the periphery of the equipment, and the air flow has poor uniform distribution; the ash falling direction is opposite to the air flow direction, so that the ash falling can fly for the second time, and the ash removal efficiency is affected; the filter bag is arranged in a vertical mode, cannot be arranged horizontally to reduce the height of equipment and optimize the trend of air flow, and cannot realize the straight inlet and straight outlet of the air flow; the dry filter bag is in a straight cylinder shape, and has high airflow resistance.
How to overcome at least one of the above technical drawbacks is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
The invention aims to provide a flue gas dust removal and denitration device which is high in ash removal efficiency and capable of relieving hardening on the surface of a filter screen.
The invention provides a flue gas dust removal and denitration device, which comprises a shell with a flue gas inlet and a flue gas outlet, wherein a dust removal and denitration area is arranged in the shell, the dust removal and denitration area comprises a plurality of air passages surrounded by a filter screen, the air passages are arranged at intervals, the dust removal and denitration area also comprises denitration catalyst units arranged between the adjacent air passages, the air passages extend along the direction from the flue gas inlet to the flue gas outlet, the two ends of the air passages are respectively provided with a first opening and a second opening, the first opening faces one side of the flue gas inlet and is of an opening structure, the second opening is close to one side of the flue gas outlet, and the second opening can be selectively opened or closed;
further comprising a suction component for providing suction power to draw dust in the airway;
when the denitration works, the second port is closed, and the flue gas enters the denitration catalyst unit through the filter screen and flows to the flue gas outlet through the denitration catalyst unit;
when the ash cleaning work is carried out, the second port is communicated with the suction component so as to generate suction force to the interior of the air passage and the surface of the filter screen.
According to the flue gas dust removal and denitration device provided by the invention, the dust outlet of the air flue is close to the flue gas outlet, namely, the dust deposition direction of dust in the air flue is the same as the airflow direction, dust deposition does not influence the flow of flue gas, the secondary flying phenomenon is eliminated, the dust deposition efficiency in flue gas is higher, the air flue and the filter screen are subjected to dust removal by the negative pressure suction force generated by the suction component, the occurrence of hardening phenomenon of the dust on the surface of the filter screen is greatly reduced, and the problem of high-temperature flue gas temperature reduction caused in the dust removal process of the filter screen is further alleviated.
Optionally, the filter screen is fixed in the denitration catalyst unit, and at least the gas passing surface of the denitration catalyst unit is covered with the filter screen.
Optionally, a predetermined gap is formed between the filter screen and the denitration catalyst unit;
or/and, the first end face, close to the flue gas inlet, of the denitration catalyst unit is a sealing face, and the side wall of the denitration catalyst unit and the second end face, close to the flue gas outlet, of the denitration catalyst unit can enable flue gas to pass through.
Optionally, the interior of the shell further comprises an injection area, and the injection area is provided with a first injection component for injecting a denitration reducing agent into the flue gas; the spraying area is positioned at the upstream of the dedusting and denitration area;
or the shell is internally provided with an injection zone, the injection zone is provided with a first injection component and a second injection component, and the first injection component is used for injecting denitration reducing agent into flue gas; the spraying area is positioned at the upstream of the dedusting and denitration area; the second injection component is used for injecting a desulfurizing agent into the flue gas; the second injection member is located downstream of the first injection member.
Optionally, the housing is vertically disposed, and the flue gas inlet is located above the flue gas outlet.
Optionally, the air passage is a venturi structure type air passage, and the middle size of the air passage is small, and the size of the air passage is larger closer to the two ends.
Optionally, a dust collecting groove is formed at the second opening of each air passage, the flue gas dust removal and denitration device is further provided with a dust conveying pipe, the dust conveying pipe can be communicated with each dust collecting groove, and the suction component extracts dust in each dust collecting groove through the dust conveying pipe.
Optionally, the device further comprises a heat energy recovery component which is arranged outside the shell; the heat energy recovery component is connected to the ash outlet of the suction component and is used for recovering part of heat of dust flowing through the heat energy recovery component;
or/and, the ash conveying pipe is obliquely arranged, and the height of the ash conveying pipe is gradually reduced along the flowing direction of dust in the ash conveying pipe.
Optionally, the device further comprises a heat exchange pipeline, wherein the heat exchange pipeline is positioned in a high-temperature flue gas pipe area of the shell, and the high-temperature flue gas pipe area is positioned at the downstream of the dedusting and denitration area; the dust part subjected to heat exchange by the heat energy recovery component is subjected to heat exchange with the flue gas flowing through the high-temperature flue gas pipe area by the heat exchange pipeline and then returns to the heat energy recovery component;
or/and, the device also comprises a high-temperature ash storage tank which is arranged on a communicating pipeline between the heat energy recovery component and the suction component.
Optionally, the device further comprises a low-temperature ash storage tank, wherein the low-temperature ash storage tank is positioned on a connecting pipeline between a dust outlet of the heat energy recovery component and the heat exchange pipeline and is positioned outside the shell
Drawings
FIG. 1 is a schematic cross-sectional view of a flue gas dust removal and denitration device in an embodiment of the invention;
FIG. 2 is an enlarged schematic view of a portion of FIG. 1 at A;
FIG. 3 is a schematic top view of a denitration catalyst unit and air flue forming combination in an embodiment of the present invention;
fig. 4 is a schematic top view of a combination of a denitration catalyst unit and an air passage in another embodiment of the present invention.
The one-to-one correspondence of the reference numerals and the component names in fig. 1 to 4 is as follows:
1-a shell, 1 a-a flue gas inlet, 1 b-a flue gas outlet, 2-an ammonia spraying device, 21-a first spraying component, 31-a second spraying component, 3-a desulfurizing agent spraying device and 4 a-an air channel; 4a 1-first port, 4a 2-second port, 4-filter screen, 5-denitration catalyst unit, 6-ash collecting tank, 7-ash conveying pipe, 8-suction component, 9-high temperature ash storage tank, 10-flow control valve, 11-heat energy recovery component, 12-low temperature ash storage tank, 13-discharge port, 14-delivery pump and 15-heat exchange pipeline.
Detailed Description
Features and exemplary embodiments of various aspects of the present application are described in detail below to make the objects, technical solutions and advantages of the present application more apparent, and to further describe the present application in conjunction with the accompanying drawings and the detailed embodiments.
The terms "first," "second," and the like, herein are merely used for convenience in describing two or more structures or components that are identical or functionally similar, and do not denote any particular limitation of order and/or importance.
Referring to fig. 1 to 4, fig. 1 is a schematic cross-sectional structure diagram of a flue gas dust removal and denitration device according to an embodiment of the present invention; FIG. 2 is an enlarged schematic view of a portion of FIG. 1 at A; FIG. 3 is a schematic top view of a denitration catalyst unit and air flue forming combination in an embodiment of the present invention; fig. 4 is a schematic top view of a combination of a denitration catalyst unit and an air passage in another embodiment of the present invention.
The invention provides a flue gas dust removal and denitration device, which comprises a shell 1, wherein the shell 1 is provided with a flue gas inlet 1a and a flue gas outlet 1b, the flue gas inlet 1a is used for being connected with a flue gas main pipeline of a boiler or other flue gas generating components, and flue gas generated by the flue gas generating components can enter the interior of the shell 1 along the flue gas main pipeline. The flue gas outlet 1b of the housing 1 may be connected to a downstream flue gas pipeline through a pipeline, that is, after the flue gas entering the housing 1 from the flue gas inlet 1a of the housing 1 is treated, the flue gas may be discharged from the flue gas outlet 1b of the housing 1 to a pipeline or atmosphere outside the housing 1. The size of the flue gas inlet 1a and the flue gas outlet 1b on the housing 1 may be product specific.
The high-temperature flue gas in the invention is provided with a dedusting and denitration area from the inside of the shell 1, the dedusting and denitration area comprises a plurality of air passages 4a surrounded by the filter screen 4, each air passage 4a extends approximately in the direction from the flue gas inlet 1a to the flue gas outlet 1b, and the size and shape of each air passage 4a can be approximately the same, and certainly can also be different. The airways 4a may be parallel to each other. For example, in fig. 1, each air passage 4a extends in the vertical direction, the cross section of each air passage 4a is approximately the same, fig. 3 shows a specific example in which the cross section of the air passage 4a is elongated, and fig. 4 shows a specific example in which the cross section of the air passage 4a is square. It is also possible for a person skilled in the art to provide a non-linear airway 4a.
The flue 4a in the invention is arranged at intervals, the dedusting and denitration area further comprises denitration catalyst units arranged between the adjacent flue 4a, the flue 4a extends along the direction from the flue gas inlet 1a to the flue gas outlet 1b, the flue 4a is provided with a first port 4a1 and a second port 4a2, the first port 4a1 faces one side of the flue gas inlet 1a and is in an opening structure, the second port 4a2 is close to one side of the flue gas outlet 1b, the second port 4a2 can be selectively opened or closed, the opening or closing of the second port 4a2 can be realized through a switch valve, and the switch valve is provided with various types, and is not described herein.
The dedusting and denitration zone further comprises a denitration catalyst module 5 arranged between the adjacent air passages 4a, the catalyst in the denitration catalyst module 5 can be formed by connecting and combining spherical catalysts, and reaction flue gas can react through gaps of the spherical catalyst pieces, so that the contact area and contact time of the flue gas and the catalyst are greatly increased, and the reaction efficiency is improved.
The flue gas dust removal and denitration device also comprises a suction component 8 for providing suction power to suck dust in the air passage 4 a; when the ash cleaning operation is performed, the second port 4a2 communicates with the suction member 8 to generate suction force to the air passage 4a and the surface of the filter screen 4, so that dust inside the air passage 4a and on the surface of the filter screen 4 is sucked out of the housing 1.
The suction member 8 may be a pump, which may be of centrifugal, axial flow or cross flow type. When the filter screen 4 surrounding the air passage 4a needs ash removal, the second port 4a2 can be opened, and the suction part 8 is started, so that negative pressure is formed in the air passage 4a, and dust deposited in the air passage 4a and dust attached to the surface of the filter screen 4 can be sucked away.
When the denitration works, the second port 4a2 is closed, and the flue gas enters the denitration catalyst module 5 through the filter screen 4 and flows to the flue gas outlet 1b through the denitration catalyst module 5.
In the above embodiments, the filter screen 4 may be fixed to the denitration catalyst module 5, and the denitration catalyst module 5 is provided with the filter screen 4 at least outside the air intake surface. That is, the end of the denitration catalyst module 5 facing the flue gas inlet 1a is a closed structure, and the end facing the flue gas outlet 1b can pass flue gas.
According to the flue gas dust removal and denitration device provided by the invention, the dust outlet of the air flue 4a is close to the flue gas outlet 1b, namely, the dust deposition direction in the air flue 4a is the same as the airflow direction, dust deposition does not influence the flow of flue gas, the secondary flying phenomenon is eliminated, the dust deposition efficiency in the flue gas is higher, the air flue 4a and the filter screen 4 are subjected to dust removal by the negative pressure suction force generated by the suction component 8, the occurrence of the hardening phenomenon of dust on the surface of the filter screen 4 is greatly reduced by the negative pressure dust removal, and the problem of high-temperature flue gas temperature reduction caused in the dust removal process of the filter screen 4 is further alleviated.
In a specific example, the filter screen 4 may be fixed to the denitration catalyst module 5, and at least the gas passing surface of the denitration catalyst module 5 is covered with the filter screen 4, however, in order to facilitate the fixation of the filter screen 4, the filter screen 4 may also cover the non-gas passing surface of the denitration catalyst module 5, and for example, the filter screen 4 may also be disposed at the closed end of the denitration catalyst module 5 or on the side abutting against the housing 1. The filter screen 4 and the denitration catalyst module 5 are provided with a preset gap, so that the filter screen 4 and the catalyst can be prevented from being damaged due to friction, meanwhile, the filter screen 4 is a protection screen of the denitration catalyst module 5, the catalyst can be prevented from being blocked, poisoned and failed, the filter screen 4 and the denitration catalyst module 5 are integrally arranged, and the installation and the replacement of the denitration catalyst module can be carried out as a whole, so that the workload is reduced.
The filter screen 4 and the denitration catalyst module 5 can be fixed in various manners, such as welding, bolting or riveting.
The first end surface 52 of the denitration catalyst module 5, which is close to the flue gas inlet 1a, is a closed surface, the side wall of the denitration catalyst module 5 and the second end surface 51, which is close to the flue gas outlet 1b, can enable flue gas to pass through, the side wall is opposite to the air passage 4a formed by the filter screen 4, flue gas in the air passage 4a enters the denitration catalyst through the side wall of the denitration catalyst, and finally flows out of the denitration catalyst module 5 from the second end surface 51.
The inside beam column that can set up of casing 1, denitration catalyst module 5 can be placed on the beam column, and beam column and casing 1 welding or joint are fixed, simple to operate.
In order to improve the flue gas denitration efficiency and the equipment integration, the shell 1 of the flue gas dust removal and denitration device is also internally integrated with an injection area, and the injection area is provided with a first injection part 21 for injecting the denitration reducing agent into the flue gas; the spraying area is positioned at the upstream of the dedusting and denitration area; the first spraying component 21 may be a spray pipe or a spray head arranged according to a predetermined design, the ammonia spraying device 2 communicated with the first spraying component 21 may be arranged outside the casing 1, and the volume of the casing 1 may be relatively small, which is beneficial to arrangement in a small-space environment, and has higher use flexibility.
In order to remove more harmful substances in the flue gas, the injection area inside the shell 1 can be further provided with a second injection part 31, and the second injection part 31 is used for injecting a desulfurizing agent into the flue gas; the second injection member 31 is located downstream of the first injection member 21. Similarly, the sulfur spraying device communicated with the second spraying part 31 can be arranged outside the shell 1, so that the use and installation flexibility is improved.
The shell 1 in the invention can be vertically arranged, and the flue gas inlet 1a is positioned above the flue gas outlet 1b. Therefore, the ash removal efficiency in the flue gas is higher.
Of course, the housing 1 may also be arranged horizontally in the lateral direction.
In the above embodiments, the air passage 4a is a venturi-type air passage 4a, and the middle dimension of the air passage 4a is small and the dimension is larger as approaching the both ends. The embodiment utilizes the principle of a Venturi structure, can realize rapid dust removal and improves the dust removal efficiency.
Of course, the shape of the air passage 4a may be a cylindrical shape or a relatively simple structure such as a polygonal column.
In a specific example, the second opening 4a2 of each air passage 4a is provided with an ash collecting groove 6, the flue gas dust removal and denitration device is further provided with an ash conveying pipe 7, the ash conveying pipe 7 can be communicated with each ash collecting groove 6, and the suction component 8 sucks dust in each ash collecting groove 6 through the ash conveying pipe 7.
In this embodiment, when the device is in normal operation (denitration), dust in the air passage 4a can be temporarily stored in the dust collecting groove 6 of the air passage 4a, and when the dust removing operation is performed, the dust collecting groove 6, the air passage 4a and the dust on the filter screen 4 are sucked to the outside through the suction part 8, so that the dust hopper is not required to be arranged in the casing 1, and the volume of the casing 1 is further reduced.
Wherein, ash conveying pipe 7 slope sets up, follows the dust is in ash conveying pipe 7 flow direction, ash conveying pipe 7's height reduces gradually to make things convenient for the outflow of dust.
In order to reduce heat loss, the device of the invention can also comprise a heat energy recovery component 11 arranged outside the shell 1; the heat energy recovery member 11 is connected to the ash outlet of the suction member 8, and the heat energy recovery member 11 is adapted to recover part of the heat of the dust flowing therethrough. Therefore, part of heat of dust can be recycled, and energy loss is reduced.
Further, the flue gas dust removal and denitration device is further provided with a heat exchange pipeline, and the heat exchange pipeline is positioned in a high-temperature flue gas pipe area of the shell 1, and the high-temperature flue gas pipe area is positioned at the downstream of the dust removal and denitration area; the dust part subjected to heat exchange by the heat energy recovery part 11 is subjected to heat exchange with the flue gas flowing through the high-temperature flue gas pipe area by the heat exchange pipeline and then returns to the heat energy recovery part 11. In order to increase the flowability of the dust, the circulation loop formed by the heat exchange line and the heat energy recovery member 11 may be further provided with a pump 14.
Thus, the dust can further absorb the heat of the purified flue gas, and the dust absorbing the heat enters the heat energy recovery component 11 again for heat exchange, so that the energy consumption of the system is further reduced.
In one example, the invention is provided with a high temperature ash storage tank 9, which is arranged in the communication line between the heat energy recovery element 11 and the suction element 8.
In addition, the invention is also provided with the low-temperature ash storage tank 12, and the low-temperature ash storage tank 12 is positioned on the connecting pipeline of the dust outlet of the heat energy recovery component 11 and the heat exchange pipeline and is positioned outside the shell 1, so that the overall stability of the system operation can be improved. Wherein the low-temperature ash storage tank 12 may be further provided with an ash discharge port 13, and part of the dust inside thereof may be discharged to the outside from the ash discharge port 13.
Flow control valves can be arranged on each section of pipeline, and the flow control valve 10 is arranged on a communicating pipeline between the high-temperature ash storage tank 9 and the heat energy recovery component 11 to realize the opening of the pipeline.
The flue gas dust removal and denitration device provided by the invention is described in detail. The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to facilitate an understanding of the method of the present invention and its core ideas. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
Claims (10)
1. The flue gas dedusting and denitration device is characterized by comprising a shell with a flue gas inlet and a flue gas outlet, wherein a dedusting and denitration area is arranged in the shell, the dedusting and denitration area comprises a plurality of air passages surrounded by a filter screen, the air passages are arranged at intervals, the dedusting and denitration area also comprises denitration catalyst units arranged between the adjacent air passages, the air passages extend from the flue gas inlet to the flue gas outlet, the two ends of the air passages are respectively provided with a first opening and a second opening, the first opening faces one side of the flue gas inlet and is of an opening structure, the second opening is close to one side of the flue gas outlet, and the second opening can be selectively opened or closed;
further comprising a suction component for providing suction power to draw dust in the airway;
when the denitration works, the second port is closed, and the flue gas enters the denitration catalyst unit through the filter screen and flows to the flue gas outlet through the denitration catalyst unit;
when the ash cleaning work is carried out, the second port is communicated with the suction component so as to generate suction force to the interior of the air passage and the surface of the filter screen.
2. The flue gas dust removal and denitration device according to claim 1, wherein the filter screen is fixed to the denitration catalyst unit, and at least the gas passing surface of the denitration catalyst unit is covered with the filter screen.
3. The flue gas dust removal and denitration device according to claim 2, wherein a predetermined gap is provided between the filter screen and the denitration catalyst unit;
or/and, the first end face, close to the flue gas inlet, of the denitration catalyst unit is a sealing face, and the side wall of the denitration catalyst unit and the second end face, close to the flue gas outlet, of the denitration catalyst unit can enable flue gas to pass through.
4. The flue gas dust removal and denitration device according to claim 1, wherein the interior of the shell further comprises an injection zone, and the injection zone is provided with a first injection component for injecting denitration reducing agent into flue gas; the spraying area is positioned at the upstream of the dedusting and denitration area;
or the shell is internally provided with an injection zone, the injection zone is provided with a first injection component and a second injection component, and the first injection component is used for injecting denitration reducing agent into flue gas; the spraying area is positioned at the upstream of the dedusting and denitration area; the second injection component is used for injecting a desulfurizing agent into the flue gas; the second injection member is located downstream of the first injection member.
5. The flue gas dust removal and denitration device according to claim 1, wherein the housing is arranged vertically, and the flue gas inlet is positioned above the flue gas outlet.
6. The flue gas dust removal and denitration device according to any one of claims 1 to 5, wherein the air passage is a venturi-structured air passage, and the air passage has a smaller intermediate dimension and a larger dimension closer to both ends.
7. The flue gas dust removal and denitration device according to any one of claims 1 to 5, wherein an ash collecting groove is arranged at the second opening of each air passage, the flue gas dust removal and denitration device is further provided with an ash conveying pipe, the ash conveying pipe can be communicated with each ash collecting groove, and the suction component is used for sucking dust in each ash collecting groove through the ash conveying pipe.
8. The flue gas dust removal and denitration device according to claim 7, further comprising a heat energy recovery member provided outside the housing; the heat energy recovery component is connected to the ash outlet of the suction component and is used for recovering part of heat of dust flowing through the heat energy recovery component;
or/and, the ash conveying pipe is obliquely arranged, and the height of the ash conveying pipe is gradually reduced along the flowing direction of dust in the ash conveying pipe.
9. The flue gas dust removal and denitration device according to claim 8, further comprising a heat exchange pipeline positioned in a high-temperature flue gas pipe area of the shell, wherein the high-temperature flue gas pipe area is positioned downstream of the dust removal and denitration area; the dust part subjected to heat exchange by the heat energy recovery component is subjected to heat exchange with the flue gas flowing through the high-temperature flue gas pipe area by the heat exchange pipeline and then returns to the heat energy recovery component;
or/and, the device also comprises a high-temperature ash storage tank which is arranged on a communicating pipeline between the heat energy recovery component and the suction component.
10. The flue gas dust removal and denitration device according to claim 9, further comprising a low-temperature ash storage tank, wherein the low-temperature ash storage tank is located on a connection line between a dust outlet of the heat energy recovery member and the heat exchange line and is located outside the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310640668.1A CN116474552A (en) | 2023-05-31 | 2023-05-31 | Flue gas dust removal denitrification facility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310640668.1A CN116474552A (en) | 2023-05-31 | 2023-05-31 | Flue gas dust removal denitrification facility |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116474552A true CN116474552A (en) | 2023-07-25 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310640668.1A Pending CN116474552A (en) | 2023-05-31 | 2023-05-31 | Flue gas dust removal denitrification facility |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116474552A (en) |
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2023
- 2023-05-31 CN CN202310640668.1A patent/CN116474552A/en active Pending
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