CN113719854A - Air preheater with ammonia removal heat exchange element - Google Patents
Air preheater with ammonia removal heat exchange element Download PDFInfo
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- CN113719854A CN113719854A CN202111001250.3A CN202111001250A CN113719854A CN 113719854 A CN113719854 A CN 113719854A CN 202111001250 A CN202111001250 A CN 202111001250A CN 113719854 A CN113719854 A CN 113719854A
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- China
- Prior art keywords
- heat exchange
- exchange element
- ammonia removal
- ammonia
- air preheater
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 title claims abstract description 303
- 229910021529 ammonia Inorganic materials 0.000 title claims abstract description 151
- 239000000945 filler Substances 0.000 claims abstract description 44
- 230000003197 catalytic effect Effects 0.000 claims abstract description 33
- 229910044991 metal oxide Inorganic materials 0.000 claims description 12
- 150000004706 metal oxides Chemical class 0.000 claims description 12
- JKQOBWVOAYFWKG-UHFFFAOYSA-N molybdenum trioxide Inorganic materials O=[Mo](=O)=O JKQOBWVOAYFWKG-UHFFFAOYSA-N 0.000 claims description 10
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 7
- 229910052802 copper Inorganic materials 0.000 claims description 6
- 229910052759 nickel Inorganic materials 0.000 claims description 6
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 6
- 229910052804 chromium Inorganic materials 0.000 claims description 5
- 229910052742 iron Inorganic materials 0.000 claims description 5
- 229910052684 Cerium Inorganic materials 0.000 claims description 4
- 229910003460 diamond Inorganic materials 0.000 claims description 3
- 239000010432 diamond Substances 0.000 claims description 3
- 229910052720 vanadium Inorganic materials 0.000 claims description 2
- 239000003546 flue gas Substances 0.000 abstract description 36
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 abstract description 35
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 11
- 238000012423 maintenance Methods 0.000 abstract description 5
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 description 42
- AKEJUJNQAAGONA-UHFFFAOYSA-N sulfur trioxide Chemical compound O=S(=O)=O AKEJUJNQAAGONA-UHFFFAOYSA-N 0.000 description 12
- 238000006243 chemical reaction Methods 0.000 description 10
- 239000007789 gas Substances 0.000 description 10
- 238000011144 upstream manufacturing Methods 0.000 description 8
- 239000003245 coal Substances 0.000 description 6
- 238000013461 design Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 229910052717 sulfur Inorganic materials 0.000 description 6
- 239000011593 sulfur Substances 0.000 description 6
- 238000012546 transfer Methods 0.000 description 6
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 5
- 239000002956 ash Substances 0.000 description 5
- 238000005096 rolling process Methods 0.000 description 5
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 4
- 230000001276 controlling effect Effects 0.000 description 4
- 239000001301 oxygen Substances 0.000 description 4
- 229910052760 oxygen Inorganic materials 0.000 description 4
- 238000004080 punching Methods 0.000 description 4
- 239000003054 catalyst Substances 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910000069 nitrogen hydride Inorganic materials 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- 238000005192 partition Methods 0.000 description 2
- 238000009991 scouring Methods 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- QNRATNLHPGXHMA-XZHTYLCXSA-N (r)-(6-ethoxyquinolin-4-yl)-[(2s,4s,5r)-5-ethyl-1-azabicyclo[2.2.2]octan-2-yl]methanol;hydrochloride Chemical compound Cl.C([C@H]([C@H](C1)CC)C2)CN1[C@@H]2[C@H](O)C1=CC=NC2=CC=C(OCC)C=C21 QNRATNLHPGXHMA-XZHTYLCXSA-N 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 229910052593 corundum Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000003344 environmental pollutant Substances 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 231100000719 pollutant Toxicity 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
- F23L15/02—Arrangements of regenerators
-
- 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
- B01D53/8634—Ammonia
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Combustion & Propulsion (AREA)
- Biomedical Technology (AREA)
- Health & Medical Sciences (AREA)
- Exhaust Gas Treatment By Means Of Catalyst (AREA)
Abstract
The invention relates to an air preheater with an ammonia removal heat exchange element, which comprises a preheater body, a first heat exchange element and a second heat exchange element which are arranged in the preheater body, and the ammonia removal heat exchange element arranged in the preheater body, wherein the first heat exchange element and the second heat exchange element are distributed up and down, the ammonia removal heat exchange element is positioned above the first heat exchange element and the second heat exchange element, the preheater body comprises a shell and a rotatable rotor which is arranged in the shell, the ammonia removal heat exchange element comprises a plurality of plate bodies, the plurality of plate bodies are distributed along the radial direction of the rotor, an open hole area is formed on each plate body, holes are formed on the plate bodies in the open hole area, and ammonia removal catalytic active fillers are filled in the holes. The invention can reduce the escape concentration of ammonia in flue gas, reduce the blockage risk of ammonium bisulfate of the air preheater and downstream equipment thereof, and the ammonia removal heat exchange element has a certain heat exchange function, can reduce the temperature of flue gas of a boiler, improves the temperature of a hot air outlet, improves the overall heat exchange efficiency of the air preheater, and has simple structure and convenient maintenance.
Description
Technical Field
The invention belongs to the technical field of air preheaters, and particularly relates to an air preheater with an ammonia removal heat exchange element.
Background
Currently, flue gas denitration technology is widely applied in the field of boiler flue gas nitrogen oxide treatment of coal-fired power station boilers and non-electric industry boilers. During denitration, ammonia escapes (NH)3) Sulfur trioxide (SO) participating in the conference with flue gas3) At low temperature to form ammonium bisulfate (NH)4HSO4) And low-temperature equipment such as an air preheater at the downstream of denitration is blocked and corroded, so that the safe and economic operation of the unit is influenced. Influenced by a plurality of factors such as a denitration inlet flue gas flow field, denitration ammonia injection mixing uniformity, catalyst performance and the like, ammonia escape without participating in reaction can occur in the flue gas denitration process, and the ammonia escape control difficulty can be increased along with the denitration efficiencyHigh and nox emission concentrations decrease and increase. In order to achieve the aim of ultralow emission of flue gas pollutants in a thermal power plant, the phenomenon of excessive ammonia injection in the denitration reaction process is increasingly common, and the ammonia escape concentration in flue gas entering an inlet of an air preheater at the downstream of denitration is increased, so that the risks of blockage and corrosion of ammonium bisulfate at the low-temperature section of the air preheater are increased increasingly.
The rotary air preheater is an air preheater commonly used in a coal-fired power plant, a heat exchange element of the rotary air preheater is usually a three-section arrangement structure (consisting of a high-temperature section, a medium-temperature section and a low-temperature section) or a two-section arrangement structure (consisting of a high-temperature section and a medium-low temperature section) according to the flow direction of flue gas, ammonium bisulfate is easily formed in the medium-low temperature section and the downstream of the air preheater and is in a sticky liquid state, and under the action of ammonium bisulfate and fly ash in the flue gas, gaps of the heat exchange element in the medium-low temperature section of the air preheater are easily blocked and corroded, so that the flue gas circulation and the heat exchange efficiency are influenced, and the safe and economic operation of a boiler is finally influenced.
In the air preheater, the generation amount of ammonium bisulfate and NH in the flue gas of the incoming flow3And SO3Is positively correlated with the concentration of (1), reducing NH3Concentration or SO3The concentration reduces the formation of ammonium bisulfate. NH (NH)3The reduction of the concentration usually depends on the optimized design and operation of an upstream SCR denitration system, but the effective control of ammonia escape is influenced by the overhigh denitration efficiency when the current nitrogen oxide is discharged in an ultralow way; SO (SO)3The concentration is reduced mainly by low-sulfur coal and SCR denitration catalyst SO2/SO3The conversion rate and the flue gas at the inlet of the air preheater are sprayed with an alkaline absorbent to remove part of SO3However, the method has the problems of high cost and difficulty in realization.
Disclosure of Invention
The invention aims to provide an air preheater with an ammonia removal heat exchange element, which is used for solving the problem of blockage of ammonium bisulfate in the conventional air preheater.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides an air heater with remove ammonia heat exchange element, includes the pre-heater body, sets up this internal first heat exchange element of pre-heater and second heat exchange element, first heat exchange element, second heat exchange element distribute from top to bottom, the pre-heater body include the casing, set up and be in the casing in and rotatable rotor, air heater still including setting up this internal ammonia heat exchange element that removes of pre-heater, ammonia heat exchange element be located first heat exchange element, second heat exchange element's top, ammonia heat exchange element that removes include the polylith plate body, the polylith the plate body follow the radial distribution of rotor, the plate body on be formed with the trompil region, the plate body in the trompil region on set up porosely, the downthehole fill have ammonia removal catalytic activity filler.
Preferably, the shape of the holes is triangular, or rhombic, or hexagonal, or circular.
Preferably, the side length or the diameter of the hole is 0.5-3 mm.
Preferably, the hole is opened with a plurality of holes, and the holes are uniformly arranged in the opening area.
Preferably, the plate body is corrugated, and the wave height of the plate body is 8-16 mm.
Further preferably, in two adjacent plate bodies, the wave crest position of one plate body corresponds to the wave trough position of the other plate body.
Preferably, the thickness of the plate body is 0.5-1.5 mm; the height of the plate body is 400-1000 mm.
Preferably, the distance between the hole opening area and the two opposite sides of the plate body in the height direction is 20-50 mm; the distance between the two opposite sides of the perforated area and the plate body in the width direction is 20-50 mm.
Preferably, the ammonia-removing catalytically active filler comprises TiO2、V2O5、WO3、MoO3Said TiO being2The mass ratio of V is 60-90%, and V is2O5The mass ratio of the WO is 0.5-2 percent3、MoO3The mass ratio of (A) is 1% -7%; the ammonia-removing catalytic active filler also comprises Fe, Cu,Ce. One or more of Co, Cr and Ni metal oxides, the mass ratio of which is 0-15%.
Preferably, the ammonia removal catalytic active filler is filled in the holes, and the thickness of the ammonia removal catalytic active filler is less than or equal to that of the plate body.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages:
the ammonia removal heat exchange element is arranged, so that the concentration of ammonia escaping from the flue gas can be greatly reduced, the ammonium bisulfate blocking risk of the air preheater and downstream equipment thereof is reduced, the operation cost is reduced, the ammonia removal heat exchange element has a certain heat exchange function, the smoke exhaust temperature of a boiler can be further reduced, the hot air outlet temperature is improved, the overall heat exchange efficiency of the air preheater is improved, the structure is simple, and the overhaul is convenient.
Drawings
FIG. 1 is a schematic structural view of an air preheater according to the present invention;
FIG. 2 is a schematic structural diagram of an ammonia removal heat exchange element of the present invention;
FIG. 3 is a schematic view of the shape of the plate body according to the present invention;
fig. 4 is a schematic view of an opening of a plate body according to the first embodiment and the fourth embodiment;
fig. 5 is a schematic view of an opening of a plate body according to a second embodiment;
fig. 6 is a schematic view of an opening of a plate body according to a third embodiment.
In the above drawings: 1. a preheater body; 11. a housing; 12. a rotor; 2. a first heat exchange element; 3. a second heat exchange element; 4. an ammonia removal heat exchange element; 41. a plate body; 411. an opening area; 412. an aperture; 413. an ammonia removal catalytic active filler.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
An air preheater with ammonia removal heat exchange element, as shown in fig. 1, includes a preheater body 1, a first heat exchange element 2, a second heat exchange element 3 and an ammonia removal heat exchange element 4, wherein the first heat exchange element 2, the second heat exchange element 3 and the ammonia removal heat exchange element 4 are all disposed in the preheater body 1, specifically:
preheater body 1 includes casing 11, rotor 12 sets up in casing 11 and rotatable, 11 inside partitions through the baffle form a plurality of storehouse bodies, including the flue gas storehouse, the air storehouse, the flue gas flows in from the flue gas storehouse entry of 11 one ends of casing to flow out from the flue gas storehouse export of the 11 other ends of casing, the air flows in from the air storehouse entry of the 11 other ends of casing, and flow out from the air storehouse export of 11 one ends of casing, at this in-process, flue gas and air carry out the heat transfer through first heat exchange element 2, second heat exchange element 3 and remove ammoniation heat element 4.
The first heat exchange element 2 and the second heat exchange element 3 are both arranged inside the shell 11, the first heat exchange element 2 and the second heat exchange element 3 are arranged in each cabin of the shell 11, the first heat exchange element 2 and the second heat exchange element 3 are distributed up and down, the first heat exchange element 2 is a high-temperature heat exchange element, the second heat exchange element 3 is a medium-low temperature heat exchange element, and the first heat exchange element 2 is positioned above the second heat exchange element 3.
Remove ammonia heat transfer element 4 and set up inside casing 11, and be located first heat transfer element 2, second heat transfer element 3's top, remove ammonia heat transfer element 4 and possess the efficient and remove the ammonia function and have certain heat transfer function. As shown in fig. 2, the ammonia removing heat exchange element 4 includes a plate body 41, the plate body 41 is provided with a plurality of blocks, the plurality of plate bodies 41 are distributed along the radial direction of the rotor 12 and have equal intervals, an open hole area 411 is formed on the plate body 41, a hole 412 is formed on the plate body 41 located in the open hole area 411, and the hole 412 is filled with an ammonia removing catalytic active filler 413, specifically:
the plate body 41 is corrugated, the wave height h is 8-16 mm, and as shown in fig. 3, the specific value of the wave height is comprehensively determined according to the design flue gas condition of the air preheater and the ammonia removal and heat exchange performance requirements of the air preheater; the height of the plate body 41 is 400-1000 mm, the thickness of the plate body 41 is 0.5-1.5 mm, and the plate body 41 is set to be thinner, so that the flue gas can shake when flowing between two adjacent plate bodies 41, the probability of smoke blockage is reduced, the incoming flue gas is rectified, and the improvement of a flue gas flow field entering the first heat exchange element 2 is facilitated; the distance between the opening area 411 of the plate body 41 and the two opposite sides of the plate body 41 in the height direction is a1、a2，a1、a2Is 20 to 50mm, and the distances between the open area 411 of the plate body 41 and the opposite sides of the plate body 41 in the width direction are b1、b2，b1、b2The value of (2) is 20-50 mm, so that the strength of the plate body 41 is ensured, and the plate body is prevented from being damaged by the scouring of dust-containing flue gas flowing in; the opposite sides of the plate body 41 in the width direction are respectively connected with the partition board inside the housing 11, the plate body 41 is a straight plate, two adjacent plate bodies 41 are parallel to each other and are arranged in a crossed manner, that is, the peak position of one plate body 41 corresponds to the valley position of the other plate body 41.
The shape of the hole 412 formed in the plate body 41 is one of a triangle, a diamond, a hexagon and a circle, the side length or the diameter of the hole 412 is 0.5-3 mm, a plurality of holes 412 are formed, the holes 412 are uniformly arranged in the hole forming area 411, and the hole 412 is formed by stretching a steel plate or punching by using a specific grinding tool.
The ammonia removing catalytically active filler 413 is filled in the holes 412, and the thickness of the ammonia removing catalytically active filler 413 is equal to or less than the thickness of the plate body 41, in this embodiment: the ammonia removing catalytically active filler 413 fills the holes 412 in the plate body 41. The ammonia removal catalytic active filler 413 enters the hole 412 in a rolling manner by a roller, and the ammonia removal catalytic active filler 413 is adhered in the hole 412 and is not easy to peel off due to flue gas scouring; the surface of the position, which is not provided with the hole, on the plate body 41 is exposed, and the ammonia removal catalytic active filler 413 is not covered, so that the area, which is not provided with the hole, on the plate body 41 can be fully contacted with hot flue gas and cold air, and the heat exchange effect is realized.
The chemical composition of the ammonia-removing catalytic active filler 413 comprises TiO2、V2O5、WO3、MoO3And one or more of metal oxides of Fe, Cu, Ce, Co, Cr and Ni, wherein TiO2Is a matrix, the mass ratio of the matrix is 60-90 percent, and V is2O50.5-2% of WO3、MoO3The mass percentage of the metal oxide is 1-7%, and the mass percentage of one or more of metal oxides of Fe, Cu, Ce, Co, Cr and Ni is 0-15%. In addition, the chemical composition of the ammonia-removing catalytically active filler 413 may also comprise SiO2、Al2O3Glass fibers, pore formers, and the like.
The invention relates to an air preheater with an ammonia removal heat exchange element, which has the working principle that:
when the flue gas containing ammonia entering the preheater body 1 flows through the ammonia removal heat exchange element 4, the flue gas containing ammonia and the ammonia removal catalytic active filler 413 filled in the holes 412 on the plate body 41 undergo selective catalytic oxidation SCO reaction to react NH3By oxidation to N2And a small amount of NOxWhile the ammonia-removing catalytically active filler 413 contains a small amount of V2O5Etc. can further eliminate part of NOxTo take offThe efficiency of removing ammonia escape in the flue gas is 60% -95%, and NO is removed cooperativelyxThe efficiency of the heat exchanger is 0-40%, so that the effects of removing ammonia and reducing nitrogen are achieved, the escape concentration of ammonia entering the first heat exchange element 2 after ammonia removal reaction is 0-3.0 mu L/L, the overall heat exchange efficiency of the air preheater is further improved, the exhaust gas temperature of the air preheater can be reduced by 0-25 ℃ compared with the air preheater without the ammonia removal heat exchange element 4, and the temperature of outlet hot air can be increased by 0-20 ℃.
The ammonia removal performance requirement of the ammonia removal heat exchange element 4 depends on the denitration efficiency of the upstream SCR denitration, the ammonia escape concentration and other factors, and is closely related to the sulfur content and the ash content of the boiler coal. The efficiency of ammonia escape in the flue gas removal by the ammonia removal heat exchange element 4 is extremely high, so that the air preheater can be suitable for ultralow emission of nitrogen oxides and high NH of upstream SCR denitration3/NOxThe molar ratio environment, namely the air preheater can adapt to the flue gas environment with the escape concentration of ammonia flowing in 3-40 mu L/L and adapt to NH for upstream SCR denitration3/NOxThe molar ratio is 0.8-1.2, the ammonia escape is effectively controlled while the high denitration efficiency operation of SCR denitration is realized, and the risk of blockage of the air preheater by ammonium bisulfate is reduced. The working temperature of the ammonia removal heat exchange element 4 is close to the denitration reaction temperature window of the SCR denitration catalyst and is 300-420 ℃. The ammonia removal performance of the ammonia removal heat exchange element 4 is gradually reduced along with the increase of the service time, and when the performance of the ammonia removal heat exchange element cannot meet the service requirement, the ammonia removal performance can be recovered or improved through a regeneration and replacement mode.
The first embodiment is as follows:
in a certain 300MW coal-fired unit, the upstream SCR denitration operation denitration efficiency of an air preheater is more than 92%, and the concentration of nitric oxide in denitration outlet flue gas is 35-50 mg/m3(dry basis, standard state, oxygen content of 6.0%), ammonia escape concentration of 3-8 muL/L, content of sulfur in the received basis of boiler coal of 0.5-1.0%, content of received basis ash of 15-25%, and when an air preheater without an ammonia removal heat exchange element is adopted, exhaust gas temperature is 130 ℃, and outlet hot air temperature is 305 ℃.
In this embodiment, an air preheater with an ammonia removal heat exchange element is adopted, the air preheater comprises the ammonia removal heat exchange element 4, the ammonia removal heat exchange element 4 comprises a plurality of plate bodies 41, and the plurality of plate bodies41 are distributed along the radial direction of the rotor 12, the height of the plate body 41 is 650mm, the thickness of the plate body 41 is 1mm, the plate body 41 is corrugated, and the wave height is 12 mm; an opening area 411 is formed on the plate body 41, a plurality of holes 412 are formed in the plate body 41 in the opening area 411, the plurality of holes 412 are uniformly arranged in the opening area 411, as shown in fig. 4, the holes 412 are circular, the diameter of the holes 412 is 1.5mm, and the opening mode is realized by punching with a specific grinding tool; the hole 412 is filled with the ammonia removal catalytic active filler 413, the ammonia removal catalytic active filler 413 enters the hole 412 in a rolling manner, and TiO in the ammonia removal catalytic active filler 4132Is 83% by mass, WO3、MoO3Is 3% by mass, V2O5The mass percentage of the filler is 0.8%, and the ammonia removal catalytic active filler 413 also comprises metal oxides of Cu, Co and Ni, wherein the mass percentage of the metal oxides is 3%, 1.5% and 0.8% respectively. The design chemical life of the ammonia removal heat exchange element 4 is not less than 24000h, and the ammonia removal heat exchange element 4 can be integrally deashed, disassembled and assembled, regenerated or replaced by combining shutdown maintenance of a coal-fired unit when in use.
The ammonia removal efficiency of the air preheater is more than 80%, the ammonia escape concentration entering the first heat exchange element and the second heat exchange element after ammonia removal reaction is 0.6-1.6 mu L/L, the efficiency of cooperatively removing nitrogen oxides is more than 20%, and the final emission concentration of the nitrogen oxides is 28-40 mg/m while controlling low ammonia escape3And the whole heat exchange efficiency of the air preheater is improved, the exhaust gas temperature is reduced by 8 ℃ compared with that of the air preheater without the ammonia removal heat exchange element, and the outlet hot air temperature is improved by 5 ℃ compared with that of the air preheater without the ammonia removal heat exchange element.
Example two:
in a certain 600MW coal-fired unit, the upstream SCR denitration operation denitration efficiency of an air preheater is more than 95%, and the concentration of nitric oxide in denitration outlet flue gas is 35-50 mg/m3(dry basis, standard state, oxygen content of 6.0%), ammonia escape concentration of 5-15 muL/L, content of sulfur in the received basis of boiler coal quality of 1.5-2.5%, content of received basis ash of 25-35%, and when an air preheater without an ammonia removal heat exchange element is adopted, exhaust gas temperature is 145 ℃ and outlet hot air temperature is 330 ℃.
In this embodiment, an air preheater with an ammonia removal heat exchange element is adopted, the air preheater includes the ammonia removal heat exchange element 4, the ammonia removal heat exchange element 4 includes a plurality of plate bodies 41, the plurality of plate bodies 41 are distributed along the radial direction of the rotor 12, the height of each plate body 41 is 850mm, the thickness of each plate body 41 is 0.8mm, each plate body 41 is corrugated, and the wave height of each plate body is 14 mm; an opening area 411 is formed on the plate body 41, a plurality of holes 412 are formed in the plate body 41 in the opening area 411, the plurality of holes 412 are uniformly arranged in the opening area 411, as shown in fig. 5, the shape of the holes 412 is a diamond shape, the side length of the holes 412 is 2mm, and the opening mode is steel belt stretching; the hole 412 is filled with the ammonia removal catalytic active filler 413, the ammonia removal catalytic active filler 413 enters the hole 412 in a rolling manner, and TiO in the ammonia removal catalytic active filler 4132Is 80% by mass, WO3、MoO3Is 4.5% by mass, V2O5The mass percentage of the filler is 0.8%, and the ammonia removal catalytic active filler 413 also comprises metal oxides of Fe, Ce and Co, and the mass percentage of the filler is 2.5%, 5% and 3%, respectively. The design chemical life of the ammonia removal heat exchange element 4 is not less than 16000h, and the ammonia removal heat exchange element 4 can be integrally cleaned, disassembled and assembled, regenerated or replaced by being combined with shutdown maintenance of a coal-fired unit during use.
The ammonia removal efficiency of the air preheater is more than 90%, the ammonia escape concentration entering the first heat exchange element and the second heat exchange element after ammonia removal reaction is 0.5-1.5 mu L/L, the efficiency of cooperatively removing nitrogen oxides is more than 15%, and the final emission concentration of the nitrogen oxides is 30-42.5 mg/m while controlling lower ammonia escape3And the whole heat exchange efficiency of the air preheater is improved, the exhaust gas temperature is reduced by 11 ℃ compared with that of the air preheater without the ammonia removal heat exchange element, and the outlet hot air temperature is improved by 7 ℃ compared with that of the air preheater without the ammonia removal heat exchange element.
Example three:
in a 1000MW coal-fired unit, the upstream SCR denitration operation denitration efficiency of an air preheater is more than 80%, and the concentration of nitric oxide in denitration outlet flue gas is 25-40 mg/m3(dry basis, standard state, oxygen content of 6.0%), ammonia escape concentration of 2-5 muL/L, and content of sulfur in boiler coal-derived basis of 0.4-0%8%, the content of the received base ash is 15% -30%, and when an air preheater without an ammonia removal heat exchange element is adopted, the exhaust gas temperature is 125 ℃, and the outlet hot air temperature is 300 ℃.
In this embodiment, an air preheater with an ammonia removal heat exchange element is adopted, the air preheater includes the ammonia removal heat exchange element 4, the ammonia removal heat exchange element 4 includes a plurality of plate bodies 41, the plurality of plate bodies 41 are distributed along the radial direction of the rotor 12, the height of each plate body 41 is 550mm, the thickness of each plate body 41 is 0.9mm, each plate body 41 is corrugated, and the wave height of each plate body is 12 mm; an opening area 411 is formed on the plate body 41, a plurality of holes 412 are formed in the plate body 41 in the opening area 411, the plurality of holes 412 are uniformly arranged in the opening area 411, as shown in fig. 6, the shape of the holes 412 is triangular, the side length of the holes 412 is 2mm, and the opening mode is realized by punching with a specific grinding tool; the hole 412 is filled with the ammonia removal catalytic active filler 413, the ammonia removal catalytic active filler 413 enters the hole 412 in a rolling manner, and TiO in the ammonia removal catalytic active filler 4132Is 78% by mass, WO3、MoO3Is 4% by mass, V2O5The mass percentage of the ammonia removal catalytic active filler 413 also comprises metal oxides of Ce, Cu and Ni, and the mass percentage of the metal oxides is 5%, 3.5% and 1.5%, respectively. The design chemical life of the ammonia removal heat exchange element 4 is not less than 24000h, and the ammonia removal heat exchange element 4 can be integrally deashed, disassembled and assembled, regenerated or replaced by combining shutdown maintenance of a coal-fired unit when in use.
The ammonia removal efficiency of the air preheater is more than 90%, the ammonia escape concentration entering the first heat exchange element and the second heat exchange element after ammonia removal reaction is 0.5-1.5 mu L/L, the efficiency of cooperatively removing nitrogen oxides is more than 15%, and the final emission concentration of the nitrogen oxides is 30-42.5 mg/m while controlling lower ammonia escape3And the whole heat exchange efficiency of the air preheater is improved, the exhaust gas temperature is reduced by 6 ℃ compared with that of the air preheater without the ammonia removal heat exchange element, and the outlet hot air temperature is improved by 4 ℃ compared with that of the air preheater without the ammonia removal heat exchange element.
Example four:
300MW coal-fired Circulating Fluidized Bed (CFB) boiler with SCR denitration upstream of air preheaterThe operation denitration efficiency is more than 82%, and the concentration of nitrogen oxides in denitration outlet flue gas is 35-50 mg/m3(dry basis, standard state, oxygen content of 6.0%), ammonia escape concentration of 5-30 muL/L, content of sulfur in the received basis of boiler coal quality of 0.8-1.5%, content of received basis ash of 25-40%, and when an air preheater without an ammonia removal heat exchange element is adopted, exhaust gas temperature is 135 ℃ and outlet hot air temperature is 305 ℃.
In this embodiment, an air preheater with an ammonia removal heat exchange element is adopted, the air preheater includes the ammonia removal heat exchange element 4, the ammonia removal heat exchange element 4 includes a plurality of plate bodies 41, the plurality of plate bodies 41 are distributed along the radial direction of the rotor 12, the height of each plate body 41 is 800mm, the thickness of each plate body 41 is 1.2mm, each plate body 41 is corrugated, and the wave height of each plate body is 14 mm; an opening area 411 is formed on the plate body 41, a plurality of holes 412 are formed in the plate body 41 in the opening area 411, the plurality of holes 412 are uniformly arranged in the opening area 411, as shown in fig. 4, the holes 412 are circular, the diameter of the holes 412 is 2.5mm, and the opening mode is realized by punching with a specific grinding tool; the hole 412 is filled with the ammonia removal catalytic active filler 413, the ammonia removal catalytic active filler 413 enters the hole 412 in a rolling manner, and TiO in the ammonia removal catalytic active filler 4132Is 75% by mass, WO3、MoO3Is 3% by mass, V2O5The mass percentage of the filler is 0.6%, and the ammonia removal catalytic active filler 413 also comprises metal oxides of Fe, Cu and Cr, and the mass percentage of the metal oxides is 3%, 4.5% and 2%, respectively. The design chemical life of the ammonia removal heat exchange element 4 is not less than 24000h, and the ammonia removal heat exchange element 4 can be integrally deashed, disassembled and assembled, regenerated or replaced by combining shutdown maintenance of a coal-fired unit when in use.
The ammonia removal efficiency of the air preheater is more than 90%, the ammonia escape concentration entering the first heat exchange element and the second heat exchange element after ammonia removal reaction is 0.5-3 mu L/L, the efficiency of cooperatively removing nitrogen oxides is more than 20%, and the final emission concentration of the nitrogen oxides is 28-40 mg/m while controlling low ammonia escape3And the whole heat exchange efficiency of the air preheater is improved, the exhaust gas temperature is reduced by 6 ℃ compared with that of the air preheater without the ammonia removal heat exchange element, and the outlet hot air temperature is reduced by 6 ℃ compared with that of the air preheater without the ammonia removal heat exchange elementThe temperature of the gas preheater is increased by 4 ℃.
The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. All equivalent changes and modifications made according to the spirit of the present invention should be covered within the protection scope of the present invention.
Claims (10)
1. The utility model provides an air heater with remove ammonia heat exchange element, includes the pre-heater body, sets up this internal first heat exchange element of pre-heater and second heat exchange element, first heat exchange element, second heat exchange element distribute from top to bottom, the pre-heater body include the casing, set up and be in the casing in and rotatable rotor, its characterized in that: the air preheater further comprises an ammonia removal heat exchange element arranged in the preheater body, the ammonia removal heat exchange element is located above the first heat exchange element and the second heat exchange element, the ammonia removal heat exchange element comprises a plurality of plate bodies, the plurality of plate bodies are distributed along the radial direction of the rotor, an open hole area is formed on the plate bodies, holes are formed in the plate bodies in the open hole area, and ammonia removal catalytic active fillers are filled in the holes.
2. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the shape of the holes adopts a triangle shape, a diamond shape, a hexagon shape or a circle shape.
3. An air preheater with an ammonia removal heat exchange element as recited in claim 1 or 2 wherein: the side length or the diameter of the hole is 0.5-3 mm.
4. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the holes are provided with a plurality of holes which are uniformly arranged in the hole opening area.
5. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the plate body is corrugated, and the wave height of the plate body is 8-16 mm.
6. An air preheater with an ammonia removal heat exchange element as recited in claim 5 wherein: in two adjacent plate bodies, the wave crest position of one plate body corresponds to the wave trough position of the other plate body.
7. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the thickness of the plate body is 0.5-1.5 mm; the height of the plate body is 400-1000 mm.
8. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the distance between the hole-opening area and the two opposite sides of the plate body in the height direction is 20-50 mm; the distance between the two opposite sides of the perforated area and the plate body in the width direction is 20-50 mm.
9. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the ammonia-removing catalytically active filler comprises TiO2、V2O5、WO3、MoO3Said TiO being2The mass ratio of V is 60-90%, and V is2O5The mass ratio of the WO is 0.5-2 percent3、MoO3The mass ratio of (A) is 1% -7%; the ammonia-removing catalytic active filler also comprises one or more of metal oxides of Fe, Cu, Ce, Co, Cr and Ni, and the mass percentage of the filler is 0-15%.
10. An air preheater with an ammonia removal heat exchange element as recited in claim 1 wherein: the ammonia removal catalytic active filler is filled in the holes, and the thickness of the ammonia removal catalytic active filler is less than or equal to that of the plate body.
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| CN105674323A (en) * | 2014-11-18 | 2016-06-15 | 国家电网公司 | Air preheater |
| CN106731803A (en) * | 2016-12-27 | 2017-05-31 | 西安交通大学 | The rotary regenerative air preheater and method of heat accumulating element coupled catalyst oxidation and denitration |
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2021
- 2021-08-30 CN CN202111001250.3A patent/CN113719854A/en active Pending
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103994462A (en) * | 2014-06-05 | 2014-08-20 | 山东大学 | Air preheating and denitration integrated reactor and reaction method |
| CN105674323A (en) * | 2014-11-18 | 2016-06-15 | 国家电网公司 | Air preheater |
| CN204943550U (en) * | 2015-09-25 | 2016-01-06 | 安徽新力电业科技咨询有限责任公司 | A kind of coal-burning power plant's rotary regenerative air heater of improvement |
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