CN108469036B - Anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater - Google Patents
Anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater Download PDFInfo
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- CN108469036B CN108469036B CN201810345406.1A CN201810345406A CN108469036B CN 108469036 B CN108469036 B CN 108469036B CN 201810345406 A CN201810345406 A CN 201810345406A CN 108469036 B CN108469036 B CN 108469036B
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- Prior art keywords
- flue gas
- air
- air preheater
- baffle
- smoke
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- 238000004140 cleaning Methods 0.000 title claims abstract description 19
- 238000005260 corrosion Methods 0.000 title claims abstract description 17
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 164
- 239000003546 flue gas Substances 0.000 claims abstract description 164
- 238000011084 recovery Methods 0.000 claims abstract description 26
- 239000000779 smoke Substances 0.000 claims description 37
- 230000000903 blocking effect Effects 0.000 claims description 25
- 238000000926 separation method Methods 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 6
- 230000007797 corrosion Effects 0.000 claims description 5
- 230000008021 deposition Effects 0.000 claims description 4
- 230000008676 import Effects 0.000 abstract description 4
- 238000012423 maintenance Methods 0.000 abstract description 4
- 238000005536 corrosion prevention Methods 0.000 abstract 1
- 239000000428 dust Substances 0.000 abstract 1
- 230000002265 prevention Effects 0.000 abstract 1
- 239000002956 ash Substances 0.000 description 18
- 238000002485 combustion reaction Methods 0.000 description 5
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 4
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000013461 design Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011010 flushing procedure Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 2
- 238000006477 desulfuration reaction Methods 0.000 description 2
- 230000023556 desulfurization Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 239000003517 fume Substances 0.000 description 2
- 238000005338 heat storage Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 230000008020 evaporation Effects 0.000 description 1
- 238000001704 evaporation Methods 0.000 description 1
- 239000010881 fly ash Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000003211 malignant effect Effects 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
Classifications
-
- 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
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J3/00—Removing solid residues from passages or chambers beyond the fire, e.g. from flues by soot blowers
- F23J3/02—Cleaning furnace tubes; Cleaning flues or chimneys
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2700/00—Ash removal, handling and treatment means; Ash and slag handling in pulverulent fuel furnaces; Ash removal means for incinerators
- F23J2700/001—Ash removal, handling and treatment means
-
- 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)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention provides the anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater which has the advantages of simple and reasonable structure, strong ash removal initiative and long service life. The utility model provides an anticorrosive anti-blocking self-cleaning vertical tubular air preheater, includes air preheater box and a plurality of preheating module, a plurality of preheating module arrange side by side in the air preheater box, is equipped with the air preheater baffle between the adjacent preheating module, the air preheater box be equipped with a plurality of air at air channel import department and separate the shelves device, every air separates shelves device and corresponds a preheating module, the air preheater box be equipped with flue gas recovery unit in high temperature flue gas passageway exit, flue gas recovery unit communicates with high temperature flue gas passageway import department through circulating line. The invention has the advantages of low initial investment and convenient large-scale popularization and use, and the internal structure of the invention ensures that the pipeline of the preheating module is prevented from adhering to dust deposit, thereby realizing the corrosion prevention and blockage prevention of the pipeline, reducing the resistance of the air preheater and reducing the operation and maintenance cost of the coal-fired unit.
Description
Technical Field
The invention relates to an air preheater, in particular to a vertical tubular air preheater.
Background
The air preheater is a device for heating air required by fuel preparation and combustion by utilizing waste heat of flue gas at the tail of a boiler. The air preheater is adopted in the boiler system, so that the combustion condition is improved while the heat efficiency of the boiler is improved, the incomplete combustion heat loss of fuel is reduced, the radiation heat transfer in the hearth is enhanced, and the evaporation heating surface is also saved.
In the normal case, the air preheater at the tail of the boiler is usually arranged in a low-temperature flue gas area containing water vapor and sulfuric acid vapor, and the working condition is relatively bad, so that low-temperature corrosion and ash blockage are easy to occur. And the air preheater positioned in the low-temperature area of the boiler can cause the blockage of a flue gas channel once low-temperature corrosion and ash blockage occur, increase induced air resistance, even ensure positive pressure combustion of the boiler, limit the output of the boiler and further cause forced furnace shutdown. The corrosion can cause leakage and damage of pipes of the air preheater, serious air leakage and deterioration of combustion working conditions, and more serious, the heating surface needs to be replaced frequently, so that the maintenance workload and the material loss are increased, and the normal operation of the boiler is influenced. Cold air enters the flue gas side, so that the flue gas temperature can be reduced, the ash blocking and low-temperature corrosion speed can be accelerated, and further, the circulation of a malignant screen is caused, and the safe operation of a boiler is threatened.
NH as the air preheater is applied to the de-pinning device 4 HSO 4 The problem of ash blocking of the low-temperature Duan Xure element frequently occurs due to deposition, the resistance of the smoke side is continuously increased, and the deposited ash adhered to the surface of the heat storage element is required to be passively removed by a high-pressure water flushing technology when the resistance is serious. Moreover, with the execution of ultralow emission standards of coal-fired units, NO X Emission index is strictly controlled at 50mg/nm 3 The problem of ash blocking of the air preheater will thus become more serious below. The technicians adopt various measures such as adopting enamel heat storage elements, strengthening the steam soot blowing operation management of the air preheater, burning coal with relatively low sulfur content, limiting the escape of SCR denitration ammonia and the like, but still cannot effectively solve the problem of ash blockage of the air preheater. The problem is ubiquitous in the industry, and according to the design, installation and key parameter monitoring level of the prior desulfurization system, the performance design value of the desulfurization system is difficult to reach by adopting a general air preheater ash blocking treatment technology.
Disclosure of Invention
The invention aims to provide the anti-corrosion anti-blocking self-cleaning vertical type air preheater which has the advantages of simple and reasonable structure, strong ash removal initiative and long service life, has a self-cleaning mode superior to that of passive ash removal of an external flushing device, is simple and convenient to install and flexible to operate, and solves the problems in the background technology.
The technical scheme adopted for solving the technical problems is as follows:
the anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater comprises an air preheater box body and a plurality of preheating modules, wherein the air preheater box body is internally provided with a heat exchanger for heat exchangeThe high-temperature flue gas channel and air channel, a plurality of preheating module arrange side by side in the air preheater box, be equipped with the air preheater baffle between the adjacent preheating module, every preheating module includes a plurality of high temperature flue gas pipes of following high temperature flue gas channel parallel arrangement, the air preheater box be equipped with a plurality of air at air channel import department and separate shelves device, every air separates shelves device and corresponds one preheating module, the air preheater box be equipped with flue gas recovery unit in high temperature flue gas channel exit, flue gas recovery unit communicates with high temperature flue gas channel import department through circulating line. Each air separation device can be controlled independently, when one air separation device is closed, the corresponding preheating module is heated up due to the loss of air exchange heat, the tube wall temperature of the high-temperature flue gas tube is increased, and NH adhered to the tube wall is evaporated by the high-temperature flue gas 4 HSO 4 The accumulated ash is washed away and taken away, the air baffle device is started after the pipe wall is cleaned, other preheating modules still work normally during the period, and the air baffle device can be opened and closed in sequence according to the requirement, so that the on-line self-cleaning in the operation of the vertical pipe type air preheater is realized; when the air separation device is closed, the flue gas recovery device can recover high-temperature flue gas which does not exchange heat with air, and the high-temperature flue gas is sent back to the inlet of the high-temperature flue gas channel through the circulating pipeline, and heat exchange is performed after the air separation device is opened, so that the aim of saving energy is fulfilled.
Preferably, the air baffle device comprises an air baffle, a main shaft and a control part, wherein the air baffle is fixedly connected with the main shaft, the main shaft is hinged with the air preheater box body, and the control part is connected with the end part of the main shaft. The air baffle rotates relative to the air preheater box body by taking the main shaft as the axis, and the control part controls the rotation angle of the air baffle through the main shaft, so that the flow of air entering the air channel is controlled; when ash removal is not needed, the air baffle is completely opened, the blocking surface of the air baffle is parallel to the air travelling direction, and air is not blocked; when ash removal is needed, the air baffle is closed, and the blocking surface of the air baffle is perpendicular to the air travelling direction or forms a certain angle, so that air is blocked as required.
Preferably, the main shaft is parallel to the high-temperature flue gas pipe. The vertical high-temperature flue gas pipe of the vertical pipe type air preheater is vertically arranged, the main shaft is vertically arranged, the installation is convenient, the space arrangement of the air baffle is convenient, and the air baffle is prevented from being limited in space, so that the opening angle of the air baffle is insufficient.
Preferably, the area of the air baffle is smaller than or equal to the area between adjacent air preheater baffle plates at the inlet of the air channel.
Preferably, the flue gas recovery device comprises a fan, a flue gas collecting pipe, a plurality of flue gas branch pipes and a plurality of flue gas valves matched with the flue gas branch pipes, wherein one end of the fan is connected with a circulating pipeline, the other end of the fan is connected with the flue gas collecting pipe, the flue gas collecting pipe is communicated with the outlet of a high-temperature flue gas channel through the flue gas branch pipes, a flue gas branch pipe is arranged between adjacent air preheater partition plates, a flue gas valve is arranged on each flue gas branch pipe, and the number of the flue gas branch pipes and the number of the flue gas valves are the same as those of the preheating modules.
Preferably, the air preheater box body is further provided with a plurality of flue gas blocking devices matched with the flue gas recovery device at the outlet of the high-temperature flue gas channel, each flue gas blocking device is arranged between one preheating module and the outlet of the high-temperature flue gas channel, and the flue gas recovery device is arranged between the flue gas blocking device and the preheating module. When the air separation device and the flue gas recovery device are operated, the flue gas blocking device can seal the high-temperature flue gas channel where the corresponding preheating module is located, so that the recovery effect of flue gas is enhanced.
Preferably, the flue gas blocking device comprises a flue gas baffle, a flue gas baffle shaft and a flue gas baffle control component, wherein the flue gas baffle is fixedly connected with the flue gas baffle shaft, the flue gas baffle shaft is hinged with the air preheater box body, and the flue gas baffle control component is connected with the end part of the flue gas baffle shaft. The smoke baffle rotates relative to the air preheater box body by taking the smoke baffle shaft as the axis, and the smoke baffle control component controls the smoke baffle to rotate through the smoke baffle shaft, so that the blocking effect on smoke is realized.
Preferably, the axis of the smoke baffle is vertical to the high-temperature smoke pipe. The vertical type air preheater has the advantages that the high-temperature flue gas pipes are vertically arranged, high-temperature flue gas advances along the high-temperature flue gas channel, the flue gas baffle shaft is transversely arranged, the space arrangement of the flue gas baffle control component and the flue gas baffle is facilitated, and the installation is convenient.
The beneficial effects of the invention are as follows:
1. the anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater has the advantages of simple and reasonable structure, convenient processing and manufacturing, less initial investment and convenient large-scale popularization and use, and the internal structure of the anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater enables the preheating module pipeline to prevent deposition from adhering, so that the anti-corrosion anti-blocking of the pipeline is realized, the resistance of the air preheater is reduced, and the operation and maintenance cost of a coal-fired unit is reduced.
2. When the accumulated ash exists in the air preheater pipeline, the pipeline is not required to be stopped for flushing, and the heat exchange between the flue gas and the air of different preheating modules in the air preheater is blocked in an orderly and controllable manner, so that the ammonium bisulfate attached to the pipeline wall is gasified, the self-cleaning is realized, and meanwhile, other preheating modules are normally operated, the operation performance of the air preheater in a boiler is not influenced, and the operation reliability and the economy of the whole coal-fired unit are improved.
3. When the heat exchange is blocked for ash removal, the flue gas recovery device can recover the high-temperature flue gas and then carry out heat exchange again, so that the operation economy is improved, and the energy consumption is saved.
Drawings
FIG. 1 is a schematic diagram of the front view of the present invention;
FIG. 2 is a schematic view of the internal structure of the present invention;
fig. 3 is a side view of the internal structure of the present invention.
In the figure: 1. the air preheater comprises an air preheater box body, 2, a preheating module, 3, a high-temperature flue gas channel, 4, an air channel, 5, an air preheater partition board, 6, a high-temperature flue gas pipe, 7, an air baffle device, 8, a flue gas recovery device, 9, a circulating pipeline, 10, a flue gas blocking device, 701, an air baffle, 702, a main shaft, 703, a control component, 801, a fan, 802, a flue gas header, 803, a flue gas branch pipe, 804, a flue gas valve, 1001, a flue gas baffle, 1002, a flue gas baffle shaft, 1003 and a flue gas baffle control component.
Detailed Description
The technical scheme of the invention is further specifically described below through specific embodiments and with reference to the accompanying drawings. It should be understood that the practice of the invention is not limited to the following examples, but is intended to be within the scope of the invention in any form and/or modification thereof.
Examples:
the anti-corrosion anti-blocking self-cleaning vertical type tubular air preheater shown in fig. 1-3 comprises an air preheater box body 1 and four preheating modules 2, wherein a high-temperature flue gas channel 3 and an air channel 4 for heat exchange are arranged in the air preheater box body 1, the high-temperature flue gas channel 3 and the air channel 4 are mutually perpendicular, the four preheating modules 2 are arranged in the air preheater box body 1 in parallel, an air preheater partition 5 is arranged between every two adjacent preheating modules 2, and each preheating module 2 comprises a plurality of high-temperature flue gas pipes 6 which are arranged in parallel along the high-temperature flue gas channel 3.
The air preheater box 1 is provided with a plurality of air baffle devices 7 at the inlet of the air channel 4, and each air baffle device 7 corresponds to one preheating module 2. The air preheater box body 1 is provided with a flue gas recovery device 8 at the outlet of the high-temperature flue gas channel 3, and the flue gas recovery device 8 is communicated with the inlet of the high-temperature flue gas channel 3 through a circulating pipeline 9.
Each air baffle device 7 can be controlled independently, when one air baffle device 7 is closed, the corresponding preheating module 2 loses the heat of air exchange, the tube wall temperature of the high-temperature flue gas tube 6 rises, and NH adhered to the tube wall is evaporated by the high-temperature flue gas 4 HSO 4 And the accumulated ash is washed away, the air baffle device 7 is started after the pipe wall is cleaned, other preheating modules 2 still work normally in the period, and the air baffle device 7 can be opened and closed in sequence according to the requirement, so that the on-line self-cleaning in the operation of the vertical pipe type air preheater is realized. Because the self-cleaning function is realized, the high-temperature flue gas pipe of the preheating module can be made of common materials, so that the anti-corrosion and anti-blocking effects are realized, and the manufacturing, running and maintenance costs are reduced.
When the air separation device 7 is closed, the flue gas recovery device 8 can recover the high-temperature flue gas which does not exchange heat with the air, and send the high-temperature flue gas back to the inlet of the high-temperature flue gas channel 3 through the circulating pipeline 9, and heat exchange is performed after the air separation device 7 is opened, so that the aim of saving energy is fulfilled.
The air baffle device 7 comprises an air baffle 701, a main shaft 702 and a control part 703, wherein the air baffle 701 is fixedly connected with the main shaft 703, the main shaft 702 is hinged with the air preheater box body 1, and the control part 703 is connected with the end part of the main shaft 702. The air baffle 701 rotates relative to the air pre-conditioner case 1 with the spindle 702 as the axis, and the control part 702 controls the rotation angle of the air baffle 701 through the spindle 702, thereby controlling the flow rate of air entering the air passage 4. When ash removal is not needed, the air baffle 701 is completely opened, and the blocking surface of the air baffle 701 is parallel to the air travelling direction and does not block air. When ash removal is needed, the air baffle 701 is closed, and the blocking surface of the air baffle 701 is perpendicular to the air travelling direction or forms a certain angle to block air according to the need.
The main shaft 702 is parallel to the high temperature flue gas pipe 6. The vertical high-temperature flue gas pipe of the vertical tubular air preheater is vertically arranged, the main shaft 702 is vertically arranged, the installation is convenient, the space arrangement of the air baffle 701 is convenient, and the air baffle 701 is prevented from being insufficient in opening angle due to space limitation. The main shaft 702 is fixedly connected with the air baffle 701 along the center line of the air baffle 701, the distance between the main shaft 702 and the side face of the preheating module facing the air channel is equal to the distance between the center line of the air baffle and the side end of the air baffle, and the design is convenient for opening and closing the air baffle and controlling the air baffle effect. The area of the air baffle 701 is equal to the area between adjacent air preheater baffles 5 at the inlet to the air channel 4.
The flue gas recovery device 8 comprises a fan 801, a flue gas header 802, four flue gas branches 803 and four flue gas valves 804 cooperating with the four flue gas branches 803. One end of the fan 801 is connected with the circulating pipeline 9, the other end of the fan 801 is connected with the flue gas header 802, the flue gas header 802 is communicated with the outlet of the high-temperature flue gas channel 3 through a plurality of flue gas branch pipes 803, a flue gas branch pipe 803 is arranged between the adjacent air preheater partition boards 5, a flue gas valve 804 is arranged on each flue gas branch pipe 803, and the number of the flue gas branch pipes 803 and the number of the flue gas valves 804 are the same as those of the preheating modules 2.
The air preheater box 1 is also provided with four flue gas blocking devices 10 matched with the flue gas recovery device 8 at the outlet of the high-temperature flue gas channel 3, each flue gas blocking device 10 is arranged between one preheating module 2 and the outlet of the high-temperature flue gas channel 3, and the flue gas recovery device 8 is arranged between the flue gas blocking device 10 and the preheating module 2. When the air separation device 7 and the flue gas recovery device 8 are operated, the flue gas blocking device 10 can seal the high-temperature flue gas channel 3 where the corresponding preheating module 2 is located, so that the recovery effect of the flue gas is enhanced.
The smoke blocking device 10 comprises a smoke baffle 1001, a smoke baffle shaft 1002 and a smoke baffle control component 1003, wherein the smoke baffle 1001 is fixedly connected with the smoke baffle shaft 1002, the smoke baffle shaft 1002 is hinged with the air preheater box body 1, and the smoke baffle control component 1003 is connected with the end part of the smoke baffle shaft 1002. The smoke baffle 1001 rotates relative to the air preheater box 1 by taking the smoke baffle shaft 1002 as the axis, and the smoke baffle control component 1003 controls the smoke baffle 1001 to rotate through the smoke baffle shaft 1002, so that the blocking effect on smoke is realized.
The fume baffle shaft 1002 is perpendicular to the high temperature fume tube 6. The vertical tube type air preheater's high temperature flue gas pipe vertical arrangement, high temperature flue gas is followed high temperature flue gas passageway 3 and is marched, and flue gas baffle axle 1002 transversely sets up, and the space arrangement of flue gas baffle control unit 1003 and flue gas baffle 1001 of being convenient for is installed conveniently.
SO in flue gas in hearth of coal-fired boiler 2 About 0.5% to about 1.0% oxidized to SO 3 After the SCR system is added, the catalyst reduces NOx to N 2 At the same time, about 1.0% SO 2 Oxidation to SO 3 Unreacted fugitive ammonia (NH) present in the SCR reactor outlet flue gas 3 ）、SO 3 The ammonia bisulfate generated by the steam reaction has viscosity, the melting point is 147 ℃ under the normal condition, and the ammonia bisulfate is dispersed in the flue gas in a liquid state and adheres to fly ash, so that a high-temperature flue gas pipe corroding the vertical tubular air preheater can be blocked; through the controllable heat exchange of flue gas and air in the vertical tubular air preheater that blocks, the high temperature flue gas that does not pass through heat exchange can promote the pipe wall temperature of the interior preheating module low temperature section of air preheater, makes the temperature reach 190 ℃, thereby evaporate the ammonium bisulfate of pipe wall adhesion, and wash away the deposition.
The above-described embodiment is only a preferred embodiment of the present invention, and is not limited in any way, and other variations and modifications may be made without departing from the technical aspects set forth in the claims.
Claims (4)
1. The utility model provides an anticorrosive anti-blocking automatically cleaning vertical tubular air heater, includes air preheater box and a plurality of preheating module, is equipped with high temperature flue gas passageway and the air channel that is used for carrying out the heat exchange in the air preheater box, and a plurality of preheating module arrange in parallel in the air preheater box, are equipped with the air preheater baffle between the adjacent preheating module, and every preheating module includes a plurality of high temperature flue gas pipes along high temperature flue gas passageway parallel arrangement, its characterized in that: the air preheater box body is provided with a plurality of air baffle devices at the inlet of the air channel, each air baffle device corresponds to a preheating module, the air preheater box body is provided with a smoke recovery device at the outlet of the high-temperature smoke channel, and the smoke recovery device is communicated with the inlet of the high-temperature smoke channel through a circulating pipeline; the air baffle device comprises an air baffle, a main shaft and a control part, wherein the air baffle is fixedly connected with the main shaft, the main shaft is hinged with the air preheater box body, and the control part is connected with the end part of the main shaft; the main shaft is parallel to the high-temperature flue gas pipe; the area of the air baffle is smaller than or equal to the area between the adjacent air preheater partition plates at the inlet of the air channel; the flue gas recovery device comprises a fan, a flue gas collecting pipe, a plurality of flue gas branch pipes and a plurality of flue gas valves matched with the flue gas branch pipes, wherein one end of the fan is connected with a circulating pipeline, the other end of the fan is connected with the flue gas collecting pipe, the flue gas collecting pipe is communicated with the outlet of a high-temperature flue gas channel through the flue gas branch pipes, a flue gas branch pipe is arranged between adjacent air preheater partition plates, each flue gas branch pipe is provided with one flue gas valve, and the number of the flue gas branch pipes and the number of the flue gas valves are the same as those of the preheating modules; each air separation device can be controlled independently, when one air separation device is closed, the corresponding preheating module is heated up due to the loss of air exchange heat, the tube wall temperature of the high-temperature flue gas tube is increased, and NH adhered to the tube wall is evaporated by the high-temperature flue gas 4 HSO 4 And wash away the deposition, open this air and separate the shelves device after the pipe wall is cleared up, other preheating module still work normally in this period, air separates shelves deviceThe vertical pipe type air preheater can be sequentially opened and closed as required, so that online self-cleaning in the operation of the vertical pipe type air preheater is realized; when the air separation device is closed, the flue gas recovery device can recover high-temperature flue gas which does not exchange heat with air, and the high-temperature flue gas is sent back to the inlet of the high-temperature flue gas channel through the circulating pipeline, and heat exchange is performed after the air separation device is opened, so that the aim of saving energy is fulfilled.
2. The anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater as set forth in claim 1, wherein: the air preheater box body is also provided with a plurality of flue gas blocking devices matched with the flue gas recovery device at the outlet of the high-temperature flue gas channel, each flue gas blocking device is arranged between one preheating module and the outlet of the high-temperature flue gas channel, and the flue gas recovery device is arranged between the flue gas blocking device and the preheating module.
3. The anti-corrosion anti-blocking self-cleaning vertical pipe type air preheater as set forth in claim 2, wherein: the smoke blocking device comprises a smoke baffle plate, a smoke baffle plate shaft and a smoke baffle plate control component, wherein the smoke baffle plate is fixedly connected with the smoke baffle plate shaft, the smoke baffle plate shaft is hinged with the air preheater box body, and the smoke baffle plate control component is connected with the end part of the smoke baffle plate shaft.
4. A corrosion-resistant anti-blocking self-cleaning vertical tube air preheater as set forth in claim 3, wherein: the flue gas baffle shaft is perpendicular to the high-temperature flue gas pipe.
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| CN109340812A (en) * | 2018-09-26 | 2019-02-15 | 大唐东北电力试验研究院有限公司 | A kind of Horizontal Tubular Air Preheater anti-block apparatus |
| CN109340813A (en) * | 2018-09-26 | 2019-02-15 | 大唐东北电力试验研究院有限公司 | A kind of vertical tubular Antiblocked device for air preheater |
| US20210080104A1 (en) * | 2019-09-06 | 2021-03-18 | University Of Kentucky Research Foundation | Air preheater and method of decomposing and removing ammonium bisulfate from a regenerative heating element of that air preheater |
| CN111981501B (en) * | 2020-07-30 | 2024-07-23 | 中国大唐集团科学技术研究院有限公司西北电力试验研究院 | Anti-blocking heat exchange device of air preheater of pulverized coal boiler |
| CN116951452A (en) * | 2023-09-19 | 2023-10-27 | 北京蓝爱迪电力技术有限公司 | Self-adaptive cleaning control system and method for air preheater |
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