CN212467734U - High-temperature dust removal and denitration integrated device - Google Patents
High-temperature dust removal and denitration integrated device Download PDFInfo
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- CN212467734U CN212467734U CN202021371173.1U CN202021371173U CN212467734U CN 212467734 U CN212467734 U CN 212467734U CN 202021371173 U CN202021371173 U CN 202021371173U CN 212467734 U CN212467734 U CN 212467734U
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Abstract
The utility model relates to a high-temperature dedusting and denitration integrated device, which is used for purifying flue gas and comprises a support system, a dedusting system, a denitration system and a flue system; the dust removal system and the denitration system are positioned on the supporting system, and the flue system comprises an air inlet flue and an air outlet flue; dust pelletizing system includes dust removal box, ash bucket, jetting device and is located the air-purifying chamber directly over the dust removal box, the dust removal box has a plurality of dust removal cabins, has an ash bucket under every dust removal cabin, the dust removal cabin includes the card and hangs the filter bag on the card, deNOx systems includes denitration flue casing, catalyst and reductant injection apparatus, air inlet flue sets up in dust removal box side relative with denitration flue casing. The utility model is used for flue gas purification in the cement technology, also can be used for other large-scale pollution sources temperature interval in the flue gas purification of 280 + 420 ℃.
Description
Technical Field
The utility model discloses atmosphere pollution control equipment, concretely relates to high temperature dust removal denitration integrated device.
Background
In the early years, SNCR technology is mainly applied to domestic cement kiln denitration, and the general efficiency is about 60%. Because the waste gas of cement enterprises has the characteristic of high dust concentration, the NOx removal efficiency of the SCR technology is not higher than 40%, and a large amount of unreacted reducing agent (ammonia water or urea) can escape, so that equipment corrosion can be caused, and the quality of cement clinker can be influenced.
In recent years, the state starts to vigorously implement the non-electric field smoke ultra-low emission modification, the cement kiln smoke ultra-low emission modification has been proposed, and a plurality of provinces have already been provided with policy documents such as local standards and air pollution prevention working schemes, and the emission concentrations of the cement kiln smoke particles, sulfur dioxide and nitrogen oxides are required to be controlled to be not higher than 10mg/m3, 50mg/m3 and 100 (or 50) mg/m3 respectively. In the existing high-efficiency denitration technology, SCR denitration is inevitably selected.
In order to ensure that the denitration efficiency is kept stable and efficient, dust should be removed in advance before SCR denitration is used, and in the prior art, various technical routes are proposed, for example, an SCR denitration catalyst box of a cement kiln high-temperature flue gas dust removal and denitration integrated device (publication number: CN111013381A) is arranged at the top of a high-temperature dust remover, and the arrangement is additionally arranged at the top of the high-temperature dust remover, so that the normal maintenance of the high-temperature dust remover is influenced, the load requirement on a unit area is increased, and the operation of environment-friendly equipment at high temperature is not facilitated.
Disclosure of Invention
To the above defect of prior art or improve in the demand one or more, the utility model provides a high temperature dust removal denitration integrated device is used for purifying the flue gas of cement kiln release in the cement manufacture, also can be used for other large-scale pollution sources temperature interval 280 plus 420 ℃ of flue gas purification.
A high-temperature dedusting and denitration integrated device is used for purifying flue gas and comprises a supporting system, a dedusting system, a denitration system and a flue system; the dust removal system and the denitration system are positioned on the supporting system, and the flue system comprises an air inlet flue and an air outlet flue; the denitration system comprises a denitration flue shell, a catalyst and a reducing agent injection device, an air inlet flue is arranged on the side surface of the dedusting box body and is opposite to the denitration flue shell, and an air outlet flue is arranged on the lower side of the denitration flue shell and is communicated with the denitration flue shell; the dust removal box body and the denitration flue shell are arranged adjacently and share one side wall plate, and the top of the dust removal box body and the top of the denitration flue shell are communicated through a gas purification chamber.
Furthermore, the dust removal box bodies are divided into two rows by the middle partition plate, and the denitration flue shells are also divided into two rows by the middle partition plate.
Furthermore, the dust removal system also comprises an airflow separation plate, the airflow separation plate is positioned in the first dust removal cabin close to the air inlet flue, the top of the airflow separation plate is fixedly connected with the pattern plate, and a certain distance is reserved between the lower part of the airflow separation plate and the ash bucket.
Further, the air inlet flue contains air inlet tuber pipe and inlet hood, the inlet hood is the horn structure, and one end is connected with the air inlet tuber pipe, and the other end and dust removal box fixed connection, and the inlet hood lower extreme extends to the ash bucket and goes up along the crossbeam position.
Furthermore, the filter bag is made of an alloy flexible membrane, and the length of the filter bag is 3-10 m.
Furthermore, the side of the air purifying chamber is provided with access holes, and the number of the access holes is equal to that of the dust removing cabins.
Furthermore, the part of the air purifying chamber opposite to the denitration flue shell is of a chamfer structure, and a plurality of arc-shaped guide plates are arranged in the chamfer structure.
Further, the reducing agent injection device comprises a reducing agent injection grid, and the reducing agent injection grid is located on the air purifying chamber shell.
Furthermore, the catalyst is arranged in 2-5 layers, and an ultrasonic generating device close to the catalyst is arranged on the denitration flue shell.
Further, the reducing agent injection device comprises a reducing agent supplement injection device, and the supplement injection device is positioned on the denitration flue shell and is arranged in the air inlet flow direction of each layer of catalyst.
The beneficial effects of the utility model reside in that:
(1) the utility model discloses a high temperature dust removal denitration integrated device through introducing the dust removal box with the flue gas from the air inlet flue, gets into the air-purifying chamber after the filter bag filters, in the air-purifying chamber, through reductant injection apparatus blowout ammonia, makes ammonia and flue gas mix, then enters into inside the denitration flue casing to make NOX restore into nitrogen and water under the effect of catalyst. Denitration and dust removal are realized, and then the purified gas is discharged from the air outlet flue.
(2) The dust removal box body and the denitration flue shell are arranged adjacently and share one side wall plate, so that the cost of manufacturing materials is saved, the heat preservation cost is saved, and the heat preservation effect is improved.
(3) The air inlet flue is optimized to be arranged, the lower end of the air inlet cover is of a horn structure and extends to the position of the beam on the upper edge of the ash bucket, the beam of the ash bucket is effectively utilized, and the use of materials is reduced.
(4) The reducing agent injection device comprises a reducing agent supplement injection device, and is beneficial to adjusting the injection amount of the reducing agent in a large range when the smoke load and smoke components are changed violently.
Drawings
FIG. 1 is a perspective view of the high temperature dust-removing and denitration integrated device of the present invention;
FIG. 2 is an exploded view of the high temperature dust removal and denitration integrated device of the present invention;
fig. 3 is a rear view of fig. 1 in accordance with the present invention;
fig. 4 is a sectional view taken along line a-a of fig. 3 according to the present invention;
fig. 5 is a sectional view taken along line B-B of fig. 3 according to the present invention;
FIG. 6 is a partial view of the air-purifying chamber of the present invention;
in all the figures, the same reference numerals denote the same features, in particular: the device comprises a supporting system 1, an air inlet flue 2, an air outlet flue 3, a dust removal box body 4, an ash bucket 5, a blowing device 6, an air purifying chamber 7, a pattern plate 8, a filter bag 9, a denitration flue shell 10, a catalyst 11, a reducing agent injection device 12, an airflow partition plate 13, an air inlet pipe 14, an air inlet cover 15, a side wall plate 16, a guide plate 17 and an ultrasonic wave generating device 18.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the invention.
Furthermore, the technical features mentioned in the embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.
Specifically, referring to fig. 1 to 6, a high-temperature dust removal and denitration integrated device for purifying flue gas comprises a support system 1, a dust removal system, a denitration system and a flue system; the dust removal system and the denitration system are positioned on the support system 1, and the flue system comprises an air inlet flue 2 and an air outlet flue 3; the denitration system comprises a denitration flue shell 10, a catalyst 11 and a reducing agent injection device 12, wherein the air inlet flue 2 is arranged on the side surface of the dedusting box 4 and is opposite to the denitration flue shell 10, and the air outlet flue 3 is arranged on the lower side of the denitration flue shell 10 and is communicated with the denitration flue shell 10; the denitration flue gas purification device is characterized in that the dedusting box body 4 and the denitration flue gas casing 10 are arranged adjacently and share one side wall plate 16, and the dedusting box body 4 is communicated with the top of the denitration flue gas casing 10 through a gas purification chamber 7.
The denitration system and the airflow in the dedusting cabin have opposite moving directions by arranging a structure of a common side wall plate 16; in the dedusting chamber, the air flow moves approximately upward, and in the inside of the denitration flue 10, the air flow moves approximately downward. After sharing the lateral wall plate structure, will remove dust box 4 and denitration flue casing 10 compact arrangement, saved steel and insulation construction, and through reasonable heat preservation measure, the temperature decline of denitration flue casing 10 is less, and the dust removal box 4 is less with denitration flue casing 10 difference in temperature, and is less to the influence of sharing the wallboard, has also reduced the temperature use load of dust removal box 4 in step.
In one embodiment, the outer shell of the dust removing box body 4 adopts a wave plate structure, the wave distance is 10-30cm, and the wave height is 30-80 mm; in another embodiment, the common side wall plate 16 is also of a corrugated plate structure, and the thickness of the common wall plate is 1.2-2.5 times that of the outer shell of the dust removing box body 4.
For guaranteeing the heat preservation effect, the shell body outside of dust removal box 4 still is equipped with insulation construction, insulation construction from interior to exterior includes high temperature resistant resin, hollow intermediate layer, rock wool and fixed establishment, fixed establishment is used for fixed hollow intermediate layer and rock wool on the shell of dust removal box 4.
The dust removal box bodies 4 are two rows and are separated by the middle partition plate, the denitration flue shell 10 is also two rows and is separated by the middle partition plate, and the influence of flue gas turbulence and local air flow on filtering and denitration is reduced by the air flow separation arrangement.
The dust removal system further comprises an airflow separation plate 13, the airflow separation plate 13 is located in a first dust removal cabin close to the air inlet flue 2, the top of the airflow separation plate is fixedly connected with the pattern plate 8, and a certain distance is reserved between the lower portion of the airflow separation plate and the ash bucket 5. In one embodiment, the airflow divider plate 13 is located inside the ash hopper in the vertical direction.
The air inlet flue 2 contains air inlet pipe 14 and air inlet cover 15, air inlet cover 15 is the horn structure, and one end is connected with air inlet pipe 14, and the other end and dust removal box 4 fixed connection, and 15 lower extremes of air inlet cover extend to the ash bucket 5 and go up along the crossbeam position, have effectively utilized the supporting role of the crossbeam of ash bucket 5, have reduced the use to the material.
In order to ensure stable air flow, in an embodiment, the air outlet flue 3 further includes a bell mouth, the bell mouth is located between the air outlets at the lower part of the 2 rows of denitration flue shells, the bell mouth is enlarged along the air flow direction, the enlarged angle of the bell mouth is 10 to 30 degrees, the diameter ratio of the large end and the small end of the bell mouth is 1: (1.2-1.5).
The filter bag 9 is made of an alloy flexible membrane, and the length of the filter bag 9 is 3-10 m. In one embodiment, the length of the filter bag 9 is any of 7m, 8m, 8.5 m. The alloy flexible membrane is a high-efficiency filter material which takes a metal material as a main body and can resist high temperature; in one embodiment, the filter bag 9 is made of metal fibers with the diameter of 1-10 μm through non-woven paving, overlapping, high-temperature sintering and bag making. In another embodiment, the filter bag 9 is made of a porous film of intermetallic compound formed by cold press molding, surface coating, and sintering a plurality of metal powders (e.g., aluminum powder, iron powder, or titanium powder).
The side of the air purifying chamber 7 is provided with access holes, and the number of the access holes is equal to that of the dust removing cabins. In order to change the filter bag conveniently, the height of the air purifying chamber 7 is not less than 1/3 of the length of the filter bag 9, the height is not less than 2.5m, the difficulty of changing the filter bag of the traditional side access hole is reduced due to the arrangement of the access hole, the number of the access holes is also reduced, the air leakage rate is correspondingly reduced, and only one access hole is arranged in one cabin.
The relative part of air-purifying chamber 7 and denitration flue casing 10 is the chamfer structure, the chamfer structure is provided with a plurality of arc guide plates 17, the air current equipartition and the direction of being convenient for. In one embodiment, the arc length of the arc-shaped guide plates is any value of 0.5-1m, such as 0.75m, the arrangement distance of the arc-shaped guide plates is any value of 0.5-0.8m, such as 0.65m, and the thickness of the arc-shaped guide plates is any value of 2-10mm, such as 0.5 mm.
The reducing agent injection device 12 comprises a reducing agent injection grid, which is located on the housing of the gas cleaning chamber 7. The air purifying chamber purifies dust, has large space and small air flow velocity, is turbulent, is convenient for mixing a reducing agent with air flow, and improves the denitration efficiency. In one embodiment, the reducing agent injection grids are arranged in 1 row in the air purifying chamber 7 near the arc-shaped guide plate 17, and of course, the reducing agent injection grids are arranged in 2 rows or 3 rows in the air purifying chamber 7 near the arc-shaped guide plate 17, as long as a better denitration proportion can be realized. In another embodiment, the reductant injection grid is uniformly disposed about the dedusting system plenum 7.
The catalyst 11 is arranged in 2-5 layers, and an ultrasonic generator 18 close to the catalyst 11 is arranged on the denitration flue shell 10 and used for cleaning the denitration catalyst 11, so that the reduction effect is prevented from being influenced by blockage.
In one embodiment, the catalyst 11 is a noble metal catalyst, specifically, the catalyst is prepared by using TiO2 as a carrier, V2O5 as a main active component, and WO3 and MoO3 as auxiliary components for oxidation resistance and anti-poisoning.
The reducing agent injection device 12 includes a reducing agent replenishment injection device that is located on the denitration flue casing 10 and is arranged in the intake air flow direction of each layer of the catalyst 11. The method is favorable for regulating the injection amount of the reducing agent in a large range when the smoke load and smoke components are changed violently. In another embodiment, the injection ratio of the reductant make-up injection device to the reductant injection grid is 1: (7-9), specifically, the ratio of 1: 8.5. the reducing agent replenishment injection device is arranged in a position where the number of the reducing agent replenishment injection devices located in the uppermost layer exceeds 60%.
In order to ensure the temperature resistance effect and the supporting effect, in an embodiment, the dust removing box 4, the air inlet hood 15, the denitration flue shell 10 and the air outlet flue 3 are all made of Q345 material, the supporting system 1 comprises a stand column and a cross beam, and the stand column and the cross beam are also made of Q345 material. The supporting system 1 further comprises an inclined strut, and the upright column, the cross beam and the inclined strut are made of one of I-shaped steel or H-shaped steel.
To achieve modular production and installation, in one embodiment, the uprights of the support system 1 are arranged uniformly along the length and width, the width of the single dedusting compartment being the same as the width of the single row of denitration shells.
The utility model discloses a high temperature dust removal denitration integrated device through introducing this device with the flue from the flue, gets into dust pelletizing system, gets into the air-purifying chamber after filtering, in the air-purifying chamber, sprays grid blowout reductant through the reductant, makes reductant and flue gas mix, then enters into in the deNOx systems to make NOX reduce into nitrogen and water under the effect of SCR catalyst, realize the denitration and remove dust, then discharge from the flue with the gas after purifying. The utility model discloses a high temperature dust removal denitration integrated device is used for purifying the waste gas of cement kiln release in the cement manufacture, also can be used for other large-scale pollution sources import temperature interval 280 and 420 ℃, NOX concentration is less than or equal to 1500mg/m3, dust concentration is less than or equal to 150g/m 3's gas cleaning.
It will be understood by those skilled in the art that the foregoing is merely a preferred embodiment of the present invention, and is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A high-temperature dust removal and denitration integrated device comprises a supporting system (1), a dust removal system, a denitration system and a flue system; the dust removal system and the denitration system are positioned on the support system (1), and the flue system comprises an air inlet flue (2) and an air outlet flue (3); the dust removal system comprises a dust removal box body (4), an ash bucket (5), a blowing device (6) and an air purification chamber (7) located right above the dust removal box body (4), wherein the dust removal box body (4) is provided with a plurality of dust removal cabins, the ash bucket (5) is arranged below each dust removal cabin, each dust removal cabin comprises a card (8) and a filter bag (9) hung on the card (8), the denitration system comprises a denitration flue shell (10), a catalyst (11) and a reducing agent injection device (12), an air inlet flue (2) is arranged on the side surface of the dust removal box body (4) and is opposite to the denitration flue shell (10), and an air outlet flue (3) is arranged on the lower side of the denitration flue shell (10) and is communicated with the denitration flue shell (10); the denitration flue gas purification device is characterized in that the dedusting box body (4) and the denitration flue gas shell (10) are arranged adjacently and share one side wall plate (16), and the dedusting box body (4) is communicated with the top of the denitration flue gas shell (10) through a gas purification chamber (7).
2. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the dedusting box bodies (4) are two rows and are separated by a middle partition plate, and the denitration flue shells (10) are also two rows and are separated by a middle partition plate.
3. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the dust removal system further comprises an airflow separation plate (13), the airflow separation plate (13) is located in a first dust removal cabin close to the air inlet flue (2), the top of the airflow separation plate is fixedly connected with the pattern plate (8), and a certain distance is reserved between the lower portion of the airflow separation plate and the ash bucket (5).
4. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: air inlet flue (2) contain air inlet tuber pipe (14) and air inlet cover (15), air inlet cover (15) are the horn structure, and one end is connected with air inlet tuber pipe (14), the other end and dust removal box (4) fixed connection, and air inlet cover (15) lower extreme extends to ash bucket (5) and goes up along the crossbeam position.
5. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the filter bag (9) is made of an alloy flexible membrane, and the length of the filter bag (9) is 3-10 m.
6. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the side of the air purifying chamber (7) is provided with access holes, and the number of the access holes is equal to that of the dust removing cabins.
7. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the part of air purification chamber (7) and denitration flue casing (10) relative is the chamfer structure, the chamfer structure is provided with a plurality of arc guide plates (17).
8. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the reducing agent injection device (12) comprises a reducing agent injection grid which is located on a housing of the air purification chamber (7).
9. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the catalyst (11) is arranged in 2-5 layers, and an ultrasonic wave generating device (18) close to the catalyst (11) is arranged on the denitration flue shell (10).
10. The integrated device for high-temperature dust removal and denitration of claim 1 is characterized in that: the reducing agent injection device (12) comprises a reducing agent supplement injection device which is positioned on the denitration flue shell (10) and is arranged in the air inlet flow direction of each layer of catalyst (11).
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| CN202021371173.1U CN212467734U (en) | 2020-07-13 | 2020-07-13 | High-temperature dust removal and denitration integrated device |
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| CN202021371173.1U CN212467734U (en) | 2020-07-13 | 2020-07-13 | High-temperature dust removal and denitration integrated device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841320A (en) * | 2020-07-13 | 2020-10-30 | 洁华控股股份有限公司 | High-temperature dust removal and denitration integrated device |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111841320A (en) * | 2020-07-13 | 2020-10-30 | 洁华控股股份有限公司 | High-temperature dust removal and denitration integrated device |
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