CN109482050B - Moving bed flue gas purification device - Google Patents
Moving bed flue gas purification device Download PDFInfo
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- CN109482050B CN109482050B CN201811536950.0A CN201811536950A CN109482050B CN 109482050 B CN109482050 B CN 109482050B CN 201811536950 A CN201811536950 A CN 201811536950A CN 109482050 B CN109482050 B CN 109482050B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/54—Nitrogen compounds
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- B01D53/02—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 by adsorption, e.g. preparative gas chromatography
- B01D53/06—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds
- B01D53/08—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 by adsorption, e.g. preparative gas chromatography with moving adsorbents, e.g. rotating beds according to the "moving bed" method
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/46—Removing components of defined structure
- B01D53/48—Sulfur compounds
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- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D2251/2062—Ammonia
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- B01D2253/10—Inorganic adsorbents
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Abstract
The invention belongs to the technical field of flue gas purification, and discloses a moving bed flue gas purification device. The moving bed flue gas purification device comprises a tower body, wherein an air inlet area, a first purification area, a flue area, a second purification area and an air outlet area are sequentially arranged in the tower body along the flow direction of flue gas, and the flue gas can enter the first purification area from the air inlet area in a counter-current mode and can enter the second purification area from the flue area in a cross-flow mode. The moving bed flue gas purification device integrates cross flow and counter flow adsorption processes, has the advantage of full contact between the flue gas and a purification area in the counter flow process, and has the advantage of small resistance in the purification area in the cross flow process; compared with a pure countercurrent process, the device has the advantages of small flue gas resistance, simple structure and low operation cost; compared with the pure cross flow process, the flue gas is fully contacted with the activated carbon, the reaction dynamics performance is good, and the purification efficiency can be obviously improved; the device has small occupied area, smooth operation of the adsorbent, small wear rate, high utilization rate and considerable economic benefit.
Description
Technical Field
The invention relates to the technical field of flue gas purification, in particular to a moving bed flue gas purification device.
Background
Currently, the activated carbon absorption tower equipment applied in industry is generally a fixed bed and moving bed process. The moving bed process is mostly a cross-flow process and a counter-flow process. The cross flow process means that flue gas horizontally passes through an activated carbon adsorption bed layer, activated carbon moves from top to bottom in a moving bed along the gravity direction, the flue gas and the activated carbon flow in a staggered mode, the process has the advantages of few components in a tower, small resistance in the tower and the like, but the flue gas horizontally passes through the activated carbon adsorption bed layer, so that the activated carbon on an air inlet surface is saturated at first, the activated carbon adsorption capacity is not fully utilized if the flue gas is discharged from the bottom, the circulation quantity of the activated carbon is increased in order to achieve higher purification efficiency, the activated carbon abrasion is increased, and the operation cost is increased; the countercurrent process means that flue gas vertically passes through an activated carbon adsorption bed layer, activated carbon moves from top to bottom in a moving bed along the gravity direction, the flue gas and the activated carbon move oppositely, the flue gas and the activated carbon are in full contact, the dynamic reaction condition is good, but the activated carbon adsorption bed layer is thick, the system resistance is large, the pressure heads of equipment such as a fan and the like are large, and the operation cost is further increased.
Chinese patent publication No. CN 108380041A discloses an activated carbon/coke-based coke oven flue gas desulfurization and denitrification system and method, wherein an absorption tower of the activated carbon/coke-based coke oven flue gas desulfurization and denitrification system is essentially a moving bed device with countercurrent contact of activated carbon/coke and flue gas, the flue gas is in good contact with the activated carbon, the overall efficiency is high, but the flue gas is mixed with ammonia gas before entering the tower, and the problem of deposition of ammonium sulfate in the tower in actual production is serious.
Chinese patent publication No. CN 108371873A, "a desulfurization and denitrification system", discloses a flue gas purification device with an activated carbon moving bed, which is characterized in that an absorption tower is provided with an absorption layer front cavity and an absorption layer rear cavity, large-particle activated carbon is placed in the rear cavity, and small-particle activated carbon is placed in the front cavity, so that activated carbon powder can be prevented from being blown out of a bed by flue gas, and the purpose of reducing dust in outlet flue gas can be achieved. The core of the method is a single-stage multilayer cross-flow moving bed technology, and the desulfurization and denitrification efficiency is not high.
An active coke flue gas purification device is disclosed in a Chinese patent 'active coke flue gas purification device' with publication number CN 107754551A, and is characterized in that the device is provided with a feeding bin, an adsorption chamber and a discharging bin from top to bottom in sequence; the herringbone grating and the triangular prism-shaped adjusting piece are arranged to divide the adsorption chamber into an air inlet adsorption area and an air outlet adsorption area, so that disordered flowing of the active coke in the tower is avoided; through adjusting the size of triangular prism shape internals and play feed bin wallboard inclination angle, change two adsorbed layer ejection of compact awl mouth widths and the unloading speed of air inlet face and the face of giving vent to anger for active burnt adsorption efficiency and flue gas concentration phase-match in two adsorbed layers, and then improve purification efficiency. The device is essentially a single-stage cross-flow moving bed process, the contact surface of the flue gas and the active carbon is small, and the effective utilization rate of the active carbon is not high.
In order to achieve higher purification efficiency, the devices designed in the current patents are not perfect and cannot effectively combine the advantages of each process. Therefore, a new moving bed flue gas purification device is needed to solve the above problems.
Disclosure of Invention
The invention aims to provide a moving bed flue gas purification device to solve the problem that the existing moving bed flue gas purification device is low in purification efficiency.
In order to achieve the purpose, the invention adopts the following technical scheme:
a moving bed flue gas purification device comprises a tower body, wherein an air inlet area, a first purification area, a flue area, a second purification area and an air outlet area are sequentially arranged in the tower body along the flow direction of flue gas, and the flue gas can enter the first purification area from the air inlet area in a counter-current mode and can enter the second purification area from the flue area in a cross-flow mode.
Preferably, the air intake area and the first purification area are arranged in parallel, the flue area, the second purification area and the air outlet area are arranged in parallel, the flue area and the second purification area are located right above the first purification area, and the air outlet area is located right above the air intake area.
Preferably, a porous plate is arranged in the first purification area, the porous plate divides the first purification area into two parts, a discharge valve is arranged at the bottom of each part, and a feed valve is arranged at the top of the second purification area.
Preferably, a width of a portion of the first purification zone adjacent to the intake zone is narrower than a width of another portion of the first purification zone.
Preferably, flowing adsorbents are arranged in the first purification area and the second purification area, and the adsorbents enter the second purification area through the feeding valve and are discharged from the discharge valve after vertically entering the first purification area through the second purification area.
Preferably, the width of the first purification area is not less than the sum of the widths of the flue area and the second purification area, and the heights of the flue area and the second purification area are 2-7 times of the height of the first purification area.
Preferably, the first purification area and the second purification area are integrally formed, and a plurality of ammonia injection grids are arranged in the flue area.
Preferably, a plurality of obliquely arranged louvers are arranged on one side of the first purification area, which is in contact with the air inlet area, and one side of the second purification area, which is in contact with the flue area and the air outlet area, respectively, and flue gas can enter the first purification area from the air inlet area, enter the second purification area from the flue area, and enter the air outlet area from the second purification area through the louvers.
Preferably, the louver has one end contacting with the side wall of the first purification area and the other end not contacting with the side wall, which is higher than the other end.
Preferably, the louver boards are arranged at the upper part of the second purification area, and the height of the louver boards which are not arranged at the two sides of the second purification area accounts for 5% -15% of the height of the second purification area.
The invention has the beneficial effects that:
the moving bed flue gas purification device integrates cross flow and counter flow adsorption processes, has the advantage of full contact between the flue gas and a purification area in the counter flow process, and has the advantage of small resistance in the purification area in the cross flow process; the moving bed flue gas purification device firstly carries out desulfurization and then sprays ammonia for denitration, so that higher purification efficiency can be achieved, and ammonium sulfate deposition in the device can be greatly reduced; compared with a pure countercurrent process, the device has the advantages of small flue gas resistance, simple structure and low operation cost; compared with the pure cross flow process, the flue gas is fully contacted with the activated carbon, the reaction dynamics performance is good, and the purification efficiency can be obviously improved; the device has small occupied area, smooth operation of the adsorbent, small wear rate, high utilization rate and considerable economic benefit.
Drawings
FIG. 1 is a schematic sectional view of a moving bed flue gas cleaning apparatus provided by the present invention;
FIG. 2 is a schematic view of the construction of the blind slats of FIG. 1.
In the figure:
the arrow is the flow direction of the flue gas;
1. an air intake zone;
21. a first purification zone; 22. a second purification zone; 23. a perforated plate;
3. a flue region; 31. an ammonia injection grid;
4. a gas outlet zone;
51. a feed valve; 52. a discharge valve;
6. a louver board.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
As shown in fig. 1, the moving bed flue gas purification device provided by the present invention comprises a tower body, wherein an air inlet region 1, a first purification region 21, a flue region 3, a second purification region 22 and an air outlet region 4 are sequentially arranged in the tower body along a flue gas flowing direction, and flue gas can enter the first purification region 21 from the air inlet region 1 in a counter-current manner and can enter the second purification region 22 from the flue region 3 in a cross-flow manner. The moving bed flue gas purification device of the invention integrates the cross flow and countercurrent adsorption processes, has the advantage of full contact between the flue gas of the countercurrent process and the purification zones (namely the first purification zone 21 and the second purification zone 22), and has the advantage of small internal resistance of the purification zones of the cross flow process; compared with a pure countercurrent process, the device has the advantages of small flue gas resistance, simple structure and low operation cost; compared with the pure cross flow process, the flue gas is fully contacted with the activated carbon, the reaction dynamics performance is good, and the purification efficiency can be obviously improved; the device has small occupied area, smooth operation of the adsorbent, small wear rate, high utilization rate and considerable economic benefit.
Specifically, the air intake region 1 is arranged in parallel with the first purification region 21, the flue region 3, the second purification region 22 and the air outlet region 4 are arranged in parallel, the flue region 3 and the second purification region 22 are located right above the first purification region 21, and the air outlet region 4 is located right above the air intake region 1, so that the flue gas can enter the first purification region 21 from the air intake region 1 in a counter-flow manner and can enter the second purification region 22 from the flue region 3 in a cross-flow manner.
Furthermore, a plurality of obliquely arranged louvers 6 (see fig. 2) are arranged on the side of the first purification area 21 contacting the air intake area 1 and the side of the second purification area 22 contacting the flue area 3 and the air outlet area 4, respectively, smoke can enter the first purification area 21 from the air intake area 1, enter the second purification area 22 from the flue area 3 and enter the air outlet area 4 from the second purification area 22 through gaps between the louvers 6, that is, by arranging a plurality of obliquely arranged louvers 6 on the side walls of the first purification area 21 and the second purification area 22, the smoke can enter the first purification area 21 from the air intake area 1 in a counter-flow manner and can enter the second purification area 22 from the flue area 3 in a cross-flow manner. Compared with the traditional point contact of the flue gas and the adsorbent through the pore plate, the point contact is improved into the surface contact through the louver group 6, so that the contact area of the flue gas and the adsorbent is greatly increased, and the resistance of the tower body is also reduced.
Further, the louver 6 is higher at one end contacting the sidewalls of the first and second purifying regions 21 and 22 than at the other end not contacting the sidewalls. Referring to fig. 2, after the flue gas enters the first purifying zone 21 from the gas inlet zone 1, the flue gas enters the first purifying zone 21 obliquely and downwardly due to the structural form of the louver 6, and the flue gas entering the first purifying zone 21 can be in countercurrent contact with the flow direction of the adsorbent in the first purifying zone 21 due to the rising of the hot flue gas and the principle of pressure difference; when the flue gas is discharged from the first purifying region 21, the flue gas enters the flue region 3, and the flue gas enters the second purifying region 22 from the flue region 3, and similarly, the flue gas entering the second purifying region 22 enters obliquely downwards, but because the width of the second purifying region 22 is relatively narrow, and the second purifying region 22 and the structure form of the louver 6 adjacent to the gas outlet region 4 cause the flow direction of the flue gas to be discharged obliquely upwards, the flue gas in the second purifying region 22 integrally presents horizontal flow, namely, the flue gas is in cross flow contact with the flow direction of the adsorbent in the second purifying region 22. The adsorbent is a granular catalyst, and may be any one or a combination of at least two of activated carbon, activated coke, activated semi-coke, and is preferably activated carbon.
Specifically, a porous plate 23 is arranged in the first purification area 21, the porous plate 23 divides the first purification area 21 into two parts, a discharge valve 52 is arranged at the bottom of each part, and a feed valve 51 is arranged at the top of the second purification area 22. The feed valve 51 and the discharge valve 52 are preferably double-layer nitrogen-sealed valves, and the adsorbent is discharged from the discharge valve 52 after entering the second purification zone 22 through the feed valve 51 and vertically entering the first purification zone 21 through the second purification zone 22. The perforated plate 23 divides the first purification zone 21 into two parts, and the width of one part of the first purification zone 21 adjacent to the gas inlet zone 1 is narrower than the width of the other part of the first purification zone 21, preferably 0.2-0.8 times, so that the flow velocity of the adsorbent in the narrower part is fast, the volume is small, and the adsorbent contacts with the flue gas first, namely the time for the adsorbent in the part to reach saturation is short, and the adsorbent discharged from the two parts can be selected according to actual needs.
In particular, the width of the first purification zone 21 is not less than the sum of the widths of the flue zone 3 and the second purification zone 22, so that the removal efficiency of the flue gas in the first purification zone 21 can be ensured and the flue gas can be prevented from leaking to other openings, i.e. not just along the flue zone 3. The louver boards 6 are arranged at the upper part of the second purifying area 22, and specifically, the height of the louver boards 6 which are not arranged at the two sides of the second purifying area 22 accounts for 5% -15% of the height of the second purifying area 22. It should be noted here that the path of the flue gas discharged through the first purifying zone 21 may be the flue zone 3, and may also be the second purifying zone 22, but since the lower part of the second purifying zone 22 is not provided with the louver 6, and the resistance of the adsorbent falling down from the second purifying zone 22 to the flue gas is greater than the lifting force of the flue gas, the path of the flue gas discharged through the first purifying zone 21 may only be the flue zone 3, and cannot enter the inside of the second purifying zone 22 and then be discharged outwards. The heights of the flue region 3 and the second purifying region 22 are 2-7 times of the height of the first purifying region 21, so that the cross flow effect of the flue gas entering the second purifying region 22 from the flue region 3 is better, and if the heights are not in the range, a good cross flow effect cannot be generated.
Specifically, first purifying area 21 and second purifying area 22 integrated into one piece are equipped with a plurality of ammonia injection grids 31 in the flue district 3, and the flue gas is firstly desulfurized by first purifying area 21, carries out the denitration by the ammonia injection grid 31 in the flue district again, can reach higher purification efficiency, can greatly reduce the ammonium sulfate deposit of tower body again.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art based on the foregoing description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A moving bed flue gas purification device comprises a tower body, and is characterized in that an air inlet area (1), a first purification area (21), a flue area (3), a second purification area (22) and an air outlet area (4) are arranged in the tower body in sequence along the flow direction of flue gas, flue gas can enter the first purification area (21) from the air inlet area (1) in a counter-current mode, and can enter the second purification area (22) from the flue area (3) in a cross-current mode;
a plurality of obliquely arranged louvers (6) are arranged on one side of the first purification area (21) contacted with the air inlet area (1) and one side of the second purification area (22) respectively contacted with the flue area (3) and the air outlet area (4), and flue gas can enter the first purification area (21) from the air inlet area (1), enter the second purification area (22) from the flue area (3) and enter the air outlet area (4) from the second purification area (22) through the louvers (6);
the louvres (6) are higher at one end in contact with the side walls of the first purification zone (21) and the second purification zone (22) than at the other end not in contact with the side walls;
the louver boards (6) are arranged at the upper part of the second purification area (22), and the height of the louver boards (6) which are not arranged at the two sides of the second purification area (22) accounts for 5% -15% of the height of the second purification area (22).
2. A moving bed flue gas cleaning apparatus according to claim 1, wherein the gas inlet zone (1) is arranged in parallel with the first cleaning zone (21), the flue zone (3), the second cleaning zone (22) and the gas outlet zone (4) are arranged in parallel, and the flue zone (3) and the second cleaning zone (22) are located directly above the first cleaning zone (21), and the gas outlet zone (4) is located directly above the gas inlet zone (1).
3. A moving bed flue gas cleaning apparatus according to claim 1, wherein a perforated plate (23) is arranged in the first cleaning zone (21), the perforated plate (23) divides the first cleaning zone (21) into two parts, and the bottom of each part is provided with a discharge valve (52), and the top of the second cleaning zone (22) is provided with a feed valve (51).
4. A moving bed flue gas cleaning apparatus according to claim 3, characterized in that the width of a part of the first cleaning zone (21) adjacent to the gas inlet zone (1) is narrower than the width of another part of the first cleaning zone (21).
5. A moving bed flue gas cleaning apparatus according to claim 3, wherein flowing adsorbent is provided in the first cleaning zone (21) and the second cleaning zone (22), and the adsorbent is fed into the second cleaning zone (22) through the feed valve (51), and discharged from the discharge valve (52) after vertically fed into the first cleaning zone (21) through the second cleaning zone (22).
6. A moving bed flue gas cleaning apparatus according to claim 1, characterized in that the width of the first cleaning zone (21) is not less than the sum of the widths of the flue zone (3) and the second cleaning zone (22), and the height of the flue zone (3) and the second cleaning zone (22) is 2-7 times the height of the first cleaning zone (21).
7. A moving bed flue gas cleaning apparatus according to claim 1, wherein the first cleaning zone (21) and the second cleaning zone (22) are formed integrally, and a plurality of ammonia injection grilles (31) are provided in the flue zone (3).
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| CN110252104A (en) * | 2019-07-16 | 2019-09-20 | 上海克硫环保科技股份有限公司 | A kind of flue gas processing device |
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| CN206240303U (en) * | 2016-11-14 | 2017-06-13 | 一重集团大连工程建设有限公司 | A kind of adverse current, the integrated activated coke smoke eliminator of cross-current type series connection |
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| CN101274193B (en) * | 2008-04-18 | 2010-09-01 | 清华大学 | System for purifying flue gas and recovering sulfur and technique |
| WO2016073070A1 (en) * | 2014-11-06 | 2016-05-12 | Exxonmobil Upstream Research Company | Adsorbing contaminants from a gas stream |
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| CN206240303U (en) * | 2016-11-14 | 2017-06-13 | 一重集团大连工程建设有限公司 | A kind of adverse current, the integrated activated coke smoke eliminator of cross-current type series connection |
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