CN110793057A - System and method for preventing air preheater of coal-fired power plant from being blocked - Google Patents
System and method for preventing air preheater of coal-fired power plant from being blocked Download PDFInfo
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- CN110793057A CN110793057A CN201910995749.7A CN201910995749A CN110793057A CN 110793057 A CN110793057 A CN 110793057A CN 201910995749 A CN201910995749 A CN 201910995749A CN 110793057 A CN110793057 A CN 110793057A
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- Prior art keywords
- air
- secondary air
- preheater
- bypass
- cold
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Links
- 238000000034 method Methods 0.000 title claims abstract description 14
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- 239000000779 smoke Substances 0.000 claims description 20
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 5
- 230000001105 regulatory effect Effects 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims 2
- 230000007797 corrosion Effects 0.000 abstract description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000009833 condensation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
-
- 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Air Supply (AREA)
Abstract
The invention discloses a system and a method for preventing an air preheater of a coal-fired power plant from being blocked, and the system and the method comprise a flue gas system, a primary air system and a secondary air system, wherein the flue gas system comprises an air preheater inlet main flue, an A flue gas baffle, a B flue gas baffle, an A air preheater inlet sub flue, a B air preheater inlet sub flue and an air preheater outlet main flue; the primary air system comprises a primary air main pipe, a primary air duct A, a cold primary air branch pipe A, a primary air duct B and a cold primary air branch pipe B; the secondary air system comprises a secondary air duct A, a secondary air bypass main pipe A, a secondary air bypass shunt pipeline A, a secondary air bypass branch pipe A, a secondary air duct B, a secondary air bypass main pipe B, a secondary air bypass shunt pipeline B and a secondary air bypass branch pipe B; the comprehensive measures such as a flue gas baffle, a primary air bypass system, a secondary air bypass system and the like are adopted to cooperatively adjust the amount of flue gas entering the air preheater and the amount of primary air and secondary air, so that the comprehensive temperature of the cold end of the air preheater is improved, and the problem of low-temperature corrosion and blockage of the air preheater is solved.
Description
Technical Field
The invention relates to a system and a method for preventing an air preheater of a coal-fired power plant from being blocked.
Background
After the SCR system is installed, the problem of blockage of the air preheater is very common, and the blockage and the rise of the pressure difference of the air preheater influence the safe and economic operation of a unit. The main reason is that the ammonia that the deNOx systems escaped generates ammonium bisulfate in air preheater cold junction and flue gas in the condensation acid, and the deposition of ammonium bisulfate has further aggravated air preheater deposition, consequently improves air heater cold junction integrated temperature and can avoid appearing low temperature acid condensation phenomenon, reduces the speed that ammonium bisulfate generated, deposited and air preheater blockked up.
The comprehensive temperature of the cold end of the air preheater is the sum of the temperature of a smoke outlet and the temperature of an air inlet, a fan heater is generally installed or a hot air circulating system is adopted on an air inlet pipeline of the air preheater in the prior method for improving the comprehensive temperature of the cold end of the air preheater, the air inlet temperature and the smoke exhaust temperature of the air preheater are controlled through adjustment of the fan heater, and then the low-temperature corrosion and the ash blockage of the air preheater are controlled.
Through the analysis of the treatment means for the blockage of the air preheater at present, no effective means for effectively solving the problem of low-temperature corrosion blockage of the air preheater exists.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a system and a method for preventing an air preheater of a coal-fired power plant from being blocked.
The technical scheme adopted by the invention for solving the problems is as follows: a system for preventing an air preheater of a coal-fired power plant from being blocked comprises a hearth, an air preheater A and an air preheater B, and is characterized by further comprising a flue gas system, a primary air system and a secondary air system, wherein the flue gas system comprises an air preheater inlet main flue, a flue gas baffle A, a flue gas baffle B, an air preheater inlet branch flue and an air preheater outlet main flue; the primary air system comprises a primary air main pipe, a primary air duct A, a cold primary air branch pipe A, a primary air duct B and a cold primary air branch pipe B; the secondary air system comprises a secondary air duct A, a secondary air bypass main pipe A, a secondary air bypass shunt pipeline A, a secondary air bypass branch pipe A, a secondary air duct B, a secondary air bypass main pipe B, a secondary air bypass shunt pipeline B and a secondary air bypass branch pipe B; the inlet main flue of the air preheater is respectively communicated with the inlet branch flue of the air preheater A and the inlet branch flue of the air preheater B, and the inlet branch flue of the air preheater A and the inlet branch flue of the air preheater B respectively penetrate through the air preheater A and the air preheater B and are communicated with the outlet main flue of the air preheater; a flue gas baffle and B flue gas baffle set up respectively in A air preheater entry divides flue and B air preheater entry branch flue, A air preheater and B air preheater are three fens storehouse formulas, the both ends in A wind channel are provided with A cold primary air entry and A hot primary air export respectively, the both ends in B wind channel are provided with B cold primary air entry and B hot primary air export respectively, the both ends in A secondary air channel are provided with A cold secondary air entry and A hot secondary air export respectively, the both ends in B secondary air channel are provided with B cold secondary air entry and B hot secondary air export respectively, A cold primary air entry and B cold primary air entry are met with the main pipe of primary air after linking to each other through A cold primary air branch pipe and B cold primary air branch pipe respectively, install A cold primary air branch pipe valve on A cold primary air branch pipe, B cold primary air branch pipe, the main pipe of primary air respectively, The air conditioner comprises a cold primary air branch pipe valve B and a primary air main pipe valve, wherein a primary air duct and a secondary air duct A penetrate through an air preheater A from the bottom and extend upwards, and a primary air duct and a secondary air duct B penetrate through an air preheater B from the bottom and extend upwards; the cold secondary air inlet A is respectively communicated with a secondary air bypass shunt pipeline A and a secondary air bypass branch pipeline A through a secondary air bypass main pipe A, the cold secondary air inlet B is respectively communicated with a secondary air bypass shunt pipeline B and a secondary air bypass branch pipe B through a secondary air bypass main pipe B, a secondary air bypass main valve A, a secondary air bypass shunt valve A and a secondary air bypass branch pipe A are respectively arranged on the secondary air bypass main pipe A, the secondary air bypass branch pipeline A and the secondary air bypass branch pipe A, a secondary air bypass main valve B, a secondary air bypass shunt valve B and a secondary air bypass branch pipe B are respectively arranged on the secondary air bypass main pipe B, the secondary air bypass branch pipe B and the secondary air bypass branch pipe B, outlets of the secondary air bypass branch pipe A and the secondary air bypass branch pipe B are respectively communicated with a secondary air channel A and a secondary air channel B, and outlets of the secondary air bypass shunting pipeline A and the secondary air bypass shunting pipeline B are respectively communicated with the bottom of the hearth.
Further, the primary air main pipe is connected with the sealing air branch pipe.
The working method of the system for preventing the air preheater of the coal-fired power plant from being blocked is characterized by comprising the following steps of:
the method comprises the following steps that firstly, according to the smoke resistance conditions of an air preheater A and an air preheater B, the opening degrees of a smoke baffle A and a smoke baffle B are reasonably adjusted, the smoke volume of a branch flue at inlets of the air preheaters at two sides is adjusted, the smoke volume is increased at one side with large smoke resistance, the cold end temperatures of the air preheater A and the air preheater B are improved, and the condition of ammonium bisulfate deposition blockage is reduced;
secondly, primary air respectively enters a cold primary air inlet A and a cold primary air inlet B, then most of the primary air respectively enters a primary air duct A and a primary air duct B, the primary air is heated by an air preheater A and an air preheater B and then respectively enters a hot primary air outlet A and a hot primary air outlet B, and a small amount of primary air respectively enters a primary air main pipe through a cold primary air branch pipe A and a cold primary air branch pipe B to serve as a bypass of sealing air;
and step three, secondary air respectively enters an A cold secondary air inlet and a B cold secondary air inlet, then most of the secondary air respectively enters an A secondary air duct and a B secondary air duct, the secondary air is heated by an A air preheater and a B air preheater and then respectively enters an A hot secondary air outlet and a B hot secondary air outlet, a small amount of secondary air respectively passes through an A secondary air bypass main pipe and a B secondary air bypass main pipe, then one path of secondary air respectively enters the bottom of the hearth through an A secondary air bypass diversion pipeline and a B secondary air bypass diversion pipeline, and the other path of secondary air respectively passes through an A secondary air bypass branch pipe and a B secondary air bypass branch pipe and then enters an A hot secondary air outlet and a B hot secondary air outlet.
Compared with the prior art, the invention has the following advantages and effects:
1) the opening degrees of the flue gas baffle A and the flue gas baffle B can be reasonably adjusted by combining the flue gas resistance conditions of the air preheater A and the air preheater B, so that the flue gas amount on two sides can be regulated, the flue gas amount is increased for one side with large flue gas resistance, the cold end temperature of the air preheater can be increased, and the condition of ammonium bisulfate deposition blockage is reduced;
2) the primary air bypass system is adopted, the primary air quantity entering the air preheater can be flexibly adjusted, the temperature of the cold end of the air preheater is improved, the resistance of the air preheater is reduced, and the primary air bypass can be used as sealing air, so that two purposes are achieved;
3) adopt overgrate air bypass system, can adjust the secondary amount of wind that gets into the air preheater in a flexible way, improve air preheater cold junction temperature, reduce air preheater resistance, and the overgrate air that gets into the furnace bottom can absorb the slag heat, improves the exhaust gas temperature, further improves the comprehensive temperature of air preheater cold junction, and the cold overgrate air that gets into hot secondary air duct can play the effect of adjusting the overgrate air temperature.
Drawings
Fig. 1 is a schematic structural diagram of an embodiment of the present invention.
In the figure: the device comprises a hearth 1, an air preheater inlet total flue 2, a B air preheater 3, an A air preheater 4, an A secondary air flue 5, an A flue gas baffle 6, a B flue gas baffle 7, an A air preheater inlet sub-flue 8, a B air preheater inlet sub-flue 9, an air preheater outlet total flue 10, a primary air main pipe 11, a primary air main pipe valve 12, a B secondary air flue 21, a B cold secondary air inlet 22, a B hot secondary air outlet 23, a B secondary air bypass total valve 24, a B secondary air bypass main pipe 25, a B secondary air bypass flow dividing valve 26, a B secondary air bypass flow dividing pipe 27, a B secondary air bypass branch pipe 28, a B secondary air bypass branch pipe valve 29, a B primary air flue 31, a B cold primary air inlet 32, a B hot primary air outlet 33, a B cold primary air branch pipe 34, a B cold primary air branch pipe valve 35, an A cold secondary air inlet 41, an A hot secondary air outlet 42, an A secondary air bypass total valve 43, a B cold secondary air bypass flow dividing valve 32, a B, The system comprises an A secondary air bypass main pipe 44, an A secondary air bypass shunt valve 45, an A secondary air bypass shunt pipeline 46, an A secondary air bypass branch pipe 47, an A secondary air bypass branch pipe valve 48, an A primary air duct 51, an A cold primary air inlet 52, an A hot primary air outlet 53, an A cold primary air branch pipe 54 and an A cold primary air branch pipe valve 55.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and are not to be construed as limiting the present invention.
Referring to fig. 1, the system for preventing the air preheater of the coal-fired power plant from being blocked in the embodiment includes a furnace 1, an air preheater a 4 and an air preheater B3, and further includes a flue gas system, a primary air system and a secondary air system, where the flue gas system includes an air preheater inlet main flue 2, an air preheater a flue gas baffle 6, a flue gas baffle B7, an air preheater a inlet sub-flue 8, an air preheater B inlet sub-flue 9 and an air preheater outlet main flue 10; the primary air system comprises a primary air main pipe 11, an A primary air channel 51, an A cold primary air branch pipe 54, a B primary air channel 31 and a B cold primary air branch pipe 34; the secondary air system comprises an A secondary air duct 5, an A secondary air bypass main pipe 44, an A secondary air bypass shunt pipeline 46, an A secondary air bypass branch pipe 47, a B secondary air duct 21, a B secondary air bypass main pipe 25, a B secondary air bypass shunt pipeline 27 and a B secondary air bypass branch pipe 28; the air preheater inlet main flue 2 is respectively communicated with an A air preheater inlet sub-flue 8 and a B air preheater inlet sub-flue 9, and the A air preheater inlet sub-flue 8 and the B air preheater inlet sub-flue 9 respectively penetrate through the A air preheater 4 and the B air preheater 3 and are communicated with an air preheater outlet main flue 10; the A flue gas baffle 6 and the B flue gas baffle 7 are respectively arranged in an A air preheater inlet sub-flue 8 and a B air preheater inlet sub-flue 9, the A air preheater 4 and the B air preheater 3 are in a three-chamber type, two ends of an A primary air duct 51 are respectively provided with an A cold primary air inlet 52 and an A hot primary air outlet 53, two ends of a B primary air duct 31 are respectively provided with a B cold primary air inlet 32 and a B hot primary air outlet 33, two ends of an A secondary air duct 5 are respectively provided with an A cold secondary air inlet 41 and an A hot secondary air outlet 42, two ends of a B secondary air duct 21 are respectively provided with a B cold secondary air inlet 22 and a B hot secondary air outlet 23, the A cold primary air inlet 52 and the B cold primary air inlet 32 are respectively connected with the A cold primary air branch pipe 54 and the B cold primary air branch pipe 34 and then are connected with the primary air main pipe 11, the primary air main pipe 11 is connected with the sealing air branch pipe, the A cold primary air branch pipe 54, the B, The cold primary air branch pipe valve 55A, the cold primary air branch pipe valve 35B and the primary air main pipe valve 12 are respectively arranged on the cold primary air branch pipe 34B and the primary air main pipe 11B, the primary air duct 51A and the secondary air duct 5A penetrate through the air preheater 4A from the bottom and extend upwards, and the primary air duct 31B and the secondary air duct 21B penetrate through the air preheater 3B from the bottom and extend upwards; the cold secondary air inlet 41A is respectively communicated with a secondary air bypass shunt pipeline 46A and a secondary air bypass branch pipe 47A through a secondary air bypass main pipe 44A, the cold secondary air inlet 22B is respectively communicated with a secondary air bypass shunt pipeline 27B and a secondary air bypass branch pipe 28B through a secondary air bypass main pipe 25B, a secondary air bypass main valve 43A, a secondary air bypass shunt valve 45A and a secondary air bypass branch pipe 48A are respectively arranged on the secondary air bypass main pipe 44A, the secondary air bypass branch pipe 46A and the secondary air bypass branch pipe 47A, a secondary air bypass main valve 24B, a secondary air bypass shunt valve 26B and a secondary air bypass branch pipe 29B are respectively arranged on the secondary air bypass main pipe 25B, the secondary air bypass branch pipe 27B and the secondary air bypass branch pipe 28B, outlets of the secondary air bypass branch pipe 47A and the secondary air bypass branch pipe 28B are respectively communicated with a secondary air duct 5A and a secondary air duct 21B, the outlets of the secondary air bypass diversion pipeline A46 and the secondary air bypass diversion pipeline B27 are respectively communicated with the bottom of the hearth 1.
The working method comprises the following steps:
the method comprises the following steps that firstly, according to the smoke resistance conditions of an A air preheater 4 and a B air preheater 3, the opening degrees of a smoke baffle 6A and a smoke baffle 7B are reasonably adjusted, the smoke volume of a branch flue at the inlets of the air preheaters at two sides is regulated and controlled, the smoke volume is increased at one side with large smoke resistance, the cold end temperatures of the A air preheater 4 and the B air preheater 3 are increased, and the condition of ammonium bisulfate deposition blockage is reduced;
secondly, primary air respectively enters the cold primary air inlet 52 of the air conditioner A and the cold primary air inlet 32 of the air conditioner B, then most of the primary air respectively enters the primary air duct 51 of the air conditioner A and the primary air duct 31 of the air conditioner B, and respectively enters the hot primary air outlet 53 of the air conditioner A and the hot primary air outlet 33 of the air conditioner B after being heated by the air pre-heater 4 of the air pre-heater A and the air pre-heater 3 of the air pre-heater B, and a small amount of primary air respectively enters the primary air main pipe 11 through the cold primary air branch pipe 54 of the air conditioner A and the cold primary;
and step three, the secondary air respectively enters the cold secondary air inlet 41A and the cold secondary air inlet 22B, then most of the secondary air respectively enters the secondary air duct 5A and the secondary air duct 21B, the secondary air is heated by the air pre-heater 4A and the air pre-heater 3B and then respectively enters the hot secondary air outlet 42A and the hot secondary air outlet 23B, a small amount of the secondary air respectively passes through the secondary air bypass main pipe 44A and the secondary air bypass main pipe 25B, then one path of the secondary air respectively passes through the secondary air bypass branch pipe 46A and the secondary air bypass branch pipe 27B and then enters the bottom of the hearth 1, and the other path of the secondary air respectively passes through the secondary air bypass branch pipe 47A and the secondary air bypass branch pipe 28B and then enters the hot secondary air outlet 42A and the hot secondary air outlet 23B.
Those not described in detail in this specification are well within the skill of the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the scope of the present invention is not limited thereto, and that various changes and modifications can be made by those skilled in the art without departing from the spirit and scope of the present invention.
Claims (3)
1. A system for preventing an air preheater of a coal-fired power plant from being blocked comprises a hearth (1), an air preheater A (4) and an air preheater B (3), and is characterized by further comprising a flue gas system, a primary air system and a secondary air system, wherein the flue gas system comprises an air preheater inlet main flue (2), an air preheater A flue gas baffle (6), an air preheater B flue gas baffle (7), an air preheater inlet sub-flue (8), an air preheater B inlet sub-flue (9) and an air preheater outlet main flue (10); the primary air system comprises a primary air main pipe (11), an A primary air channel (51), an A cold primary air branch pipe (54), a B primary air channel (31) and a B cold primary air branch pipe (34); the secondary air system comprises an A secondary air duct (5), an A secondary air bypass main pipe (44), an A secondary air bypass shunt pipeline (46), an A secondary air bypass branch pipe (47), a B secondary air duct (21), a B secondary air bypass main pipe (25), a B secondary air bypass shunt pipeline (27) and a B secondary air bypass branch pipe (28); the air preheater inlet main flue (2) is respectively communicated with an A air preheater inlet sub-flue (8) and a B air preheater inlet sub-flue (9), and the A air preheater inlet sub-flue (8) and the B air preheater inlet sub-flue (9) respectively penetrate through the A air preheater (4) and the B air preheater (3) and are communicated with an air preheater outlet main flue (10); a flue gas baffle (6) and B flue gas baffle (7) set up respectively in A air preheater entry divides flue (8) and B air preheater entry branch flue (9), A air preheater (4) and B air preheater (3) are three fens storehouse formulas, the both ends in A wind channel (51) are provided with A cold once wind entry (52) and A hot once wind export (53) respectively, the both ends in B wind channel (31) are provided with B cold once wind entry (32) and B hot once wind export (33) respectively, the both ends in A secondary air channel (5) are provided with A cold overgrate air entry (41) and A hot overgrate air export (42) respectively, the both ends in B secondary air channel (21) are provided with B cold overgrate air entry (22) and B hot overgrate air export (23) respectively, a cold once wind entry (52) and B cold once wind entry (32) link to each other with once wind branch pipe (54) and B cold once wind branch pipe (34) respectively through A The air main pipe (11) is connected, an A cold primary air branch pipe valve (55), a B cold primary air branch pipe valve (35) and a primary air main pipe valve (12) are respectively installed on the A cold primary air branch pipe (54), the B cold primary air branch pipe (34) and the primary air main pipe (11), the A primary air duct (51) and the A secondary air duct (5) penetrate through the A air preheater (4) from the bottom and extend upwards, and the B primary air duct (31) and the B secondary air duct (21) penetrate through the B air preheater (3) from the bottom and extend upwards; a cold overgrate air entry (41) communicate with A overgrate air bypass shunt pipe way (46) and A overgrate air bypass branch pipe (47) respectively through female pipe (44) of A overgrate air bypass, B cold overgrate air entry (22) communicate with B overgrate air bypass shunt pipe way (27) and B overgrate air bypass branch pipe (28) respectively through female pipe (25) of B overgrate air bypass, install A overgrate air bypass main valve (43), A overgrate air bypass shunt valve (45), A overgrate air bypass branch pipe valve (48) on female pipe (44), A overgrate air bypass shunt pipe way (46), A overgrate air bypass branch pipe (47) respectively, install B overgrate air bypass main valve (24), B overgrate air bypass shunt valve (26) respectively on female pipe (25), B overgrate air bypass shunt pipe way (27), B overgrate air bypass branch pipe (28) respectively, And the outlets of the A secondary air bypass branch pipe (47) and the B secondary air bypass branch pipe (28) are respectively communicated with the A secondary air duct (5) and the B secondary air duct (21), and the outlets of the A secondary air bypass branch pipe (46) and the B secondary air bypass branch pipe (27) are respectively communicated with the bottom of the hearth (1).
2. The system for preventing blockage of an air preheater of a coal fired power plant as set forth in claim 1, wherein said primary air main duct (11) is connected to a seal air branch duct.
3. A method of operating a system for preventing plugging of a coal fired power plant air preheater as claimed in claim 1 or 2, characterized by the process of:
the method comprises the following steps that firstly, according to the smoke resistance conditions of an A air preheater (4) and a B air preheater (3), the opening degrees of a smoke baffle plate (6) and a smoke baffle plate (7) are reasonably adjusted, the smoke volume of a branch flue at the inlets of the air preheaters at two sides is regulated and controlled, the smoke volume is increased at one side with large smoke resistance, the cold end temperatures of the A air preheater (4) and the B air preheater (3) are increased, and the condition of ammonium bisulfate deposition blockage is reduced;
secondly, primary air respectively enters an A cold primary air inlet (52) and a B cold primary air inlet (32), then most of the primary air respectively enters an A primary air channel (51) and a B primary air channel (31), the primary air is heated by an A air preheater (4) and a B air preheater (3) and then respectively enters an A hot primary air outlet (53) and a B hot primary air outlet (33), and a small amount of primary air respectively enters a primary air main pipe (11) through an A cold primary air branch pipe (54) and a B cold primary air branch pipe (34) to serve as a bypass of sealing air;
and thirdly, secondary air respectively enters an A cold secondary air inlet (41) and a B cold secondary air inlet (22), then most of the secondary air respectively enters an A secondary air duct (5) and a B secondary air duct (21), the secondary air respectively enters an A hot secondary air outlet (42) and a B hot secondary air outlet (23) after being heated by an A air preheater (4) and a B air preheater (3), a small amount of secondary air respectively passes through an A secondary air bypass main pipe (44) and a B secondary air bypass main pipe (25), then one path of secondary air respectively enters the bottom of the hearth (1) through an A secondary air bypass shunting pipeline (46) and a B secondary air bypass shunting pipeline (27), and the other path of secondary air respectively passes through an A secondary air bypass branch pipe (47) and a B secondary air bypass branch pipe (28) and then enters the A hot secondary air outlet (42) and the B hot secondary air outlet (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910995749.7A CN110793057B (en) | 2019-10-18 | 2019-10-18 | System and method for preventing blockage of air preheater of coal-fired power plant |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910995749.7A CN110793057B (en) | 2019-10-18 | 2019-10-18 | System and method for preventing blockage of air preheater of coal-fired power plant |
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| CN110793057B CN110793057B (en) | 2024-01-30 |
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