CN110793057B - System and method for preventing blockage of air preheater of coal-fired power plant - Google Patents
System and method for preventing blockage of air preheater of coal-fired power plant Download PDFInfo
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- CN110793057B CN110793057B CN201910995749.7A CN201910995749A CN110793057B CN 110793057 B CN110793057 B CN 110793057B CN 201910995749 A CN201910995749 A CN 201910995749A CN 110793057 B CN110793057 B CN 110793057B
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- preheater
- branch pipe
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- 238000000034 method Methods 0.000 title claims abstract description 9
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 51
- 239000003546 flue gas Substances 0.000 claims abstract description 51
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 claims description 7
- 230000001105 regulatory effect Effects 0.000 claims description 7
- 230000008021 deposition Effects 0.000 claims description 6
- 238000007789 sealing Methods 0.000 claims description 6
- 206010022000 influenza Diseases 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 abstract description 3
- 230000007797 corrosion Effects 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
- 239000007789 gas Substances 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 239000000779 smoke 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)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (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, 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, 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, an A primary air duct, an A cold primary air branch pipe, a B primary air duct and a B cold primary air branch pipe; the secondary air system comprises an A secondary air channel, an A secondary air bypass main pipe, an A secondary air bypass shunt pipeline, an A secondary air bypass branch pipe, a B secondary air channel, a B secondary air bypass main pipe, a B secondary air bypass shunt pipeline and a B secondary air bypass branch pipe; the comprehensive means such as a flue gas baffle, a primary air bypass system and a secondary air bypass system are adopted to cooperatively adjust the flue gas quantity and the primary air quantity and the secondary air quantity entering the air preheater, 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 air preheater blockage is very common, and the safety and economical operation of the unit are affected by air preheater blockage and pressure difference increase. The main reason is that ammonia escaped from the denitration system condenses acid in the cold end of the air preheater and the flue gas to generate ammonium bisulfate, and the deposition of the ammonium bisulfate further weights the dust accumulation of the air preheater, so that the low-temperature acid condensation phenomenon can be avoided by increasing the comprehensive temperature of the cold end of the air preheater, and the speeds of the generation and deposition of the ammonium bisulfate and the blockage of the air preheater are reduced.
The cold end comprehensive temperature of the air preheater is the sum of the flue gas outlet temperature and the air inlet temperature, a warm air heater or a hot air circulation system is generally arranged on an air inlet pipeline of the air preheater, and the air inlet temperature and the exhaust gas temperature of the air preheater are controlled through adjustment of the warm air heater or the hot air circulation system, so that the low-temperature corrosion and ash blocking of the air preheater are controlled, but the problem of increased system resistance exists in both the warm air heater and the hot air circulation system, and the problem of lower exhaust gas temperature still cannot be solved under the maximum output of the warm air heater or the hot air circulation system.
Through analysis of the current treatment means of the air preheater blockage, no effective means is available at present for effectively solving the problem of low-temperature corrosion blockage of the air preheater.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a system and a method for preventing the air preheater of a coal-fired power plant from being blocked.
The invention solves the problems by adopting the following technical scheme: the system for preventing the air preheater of the coal-fired power plant from being blocked comprises a hearth, an A air preheater and a B air preheater, 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, 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, an A primary air channel, an A cold primary air branch pipe, a B primary air channel and a B cold primary air branch pipe; the secondary air system comprises an A secondary air channel, an A secondary air bypass main pipe, an A secondary air bypass branch pipe, a B secondary air channel, a B secondary air bypass main pipe, a B secondary air bypass branch pipe and a B secondary air bypass branch pipe; the air preheater inlet main flue is respectively communicated with the air preheater inlet sub-flue A and the air preheater inlet sub-flue B, and the air preheater inlet sub-flue A and the air preheater inlet sub-flue B respectively pass through the air preheater A and the air preheater B and are communicated with the air preheater outlet main flue; the A flue gas baffle and the B flue gas baffle are respectively arranged in an inlet sub-flue of the A air preheater and an inlet sub-flue of the B air preheater, the A air preheater and the B air preheater are respectively in three sub-bins, the two ends of the A primary air flue are respectively provided with an A cold primary air inlet and an A hot primary air outlet, the two ends of the B primary air flue are respectively provided with a B cold primary air inlet and a B hot primary air outlet, the two ends of the A secondary air flue are respectively provided with an A cold secondary air inlet and an A hot secondary air outlet, the two ends of the B secondary air flue are respectively provided with a B cold secondary air inlet and a B hot secondary air outlet, the A-cooled primary air inlet and the B-cooled primary air inlet are respectively connected with the primary air main pipe through an A-cooled primary air branch pipe and a B-cooled primary air branch pipe, an A-cooled primary air branch pipe valve, a B-cooled primary air branch pipe valve and a primary air main pipe valve are respectively arranged on the A-cooled primary air branch pipe, the B-cooled primary air branch pipe and the primary air main pipe, the A-cooled primary air channel and the A-cooled primary air main pipe valve penetrate through the A-air preheater from the bottom and extend upwards, and the B-cooled primary air channel and the B-cooled secondary air channel penetrate through the B-air preheater from the bottom and extend upwards; the cold air inlet of the A secondary air is respectively communicated with the A secondary air bypass branch pipeline and the A secondary air bypass branch pipeline through the A secondary air bypass main pipe, the cold air inlet of the B secondary air is respectively communicated with the B secondary air bypass branch pipeline and the B secondary air bypass branch pipeline through the B secondary air bypass main pipe, the A secondary air bypass branch pipeline and the A secondary air bypass branch pipeline are respectively provided with an A secondary air bypass main valve, an A secondary air bypass branch valve and an A secondary air bypass branch pipeline, the B secondary air bypass main pipe, the B secondary air bypass branch pipeline and the B secondary air bypass branch pipeline are respectively provided with a B secondary air bypass main valve, a B secondary air bypass branch valve and a B secondary air bypass branch pipeline, the outlets of the A secondary air bypass branch pipeline and the B secondary air bypass branch pipeline 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 blockage of the air preheater of the coal-fired power plant is characterized by comprising the following steps of:
according to the flue gas resistance conditions of the air preheater A and the air preheater B, opening degrees of the flue gas baffle A and the flue gas baffle B are reasonably adjusted, and flue gas amounts of the inlet branch flues of the air preheater on two sides are regulated, so that the flue gas amount is increased on one side with high flue gas resistance, the cold end temperatures of the air preheater A and the air preheater B are increased, and the occurrence of ammonium bisulfate deposition blockage is reduced;
secondly, primary air enters a cold primary air inlet and a cold primary air inlet respectively, then most of primary air enters the A primary air channel and the B primary air channel respectively, and enters an A hot primary air outlet and a B hot primary air outlet respectively after being heated by an A air preheater and a B air preheater, and a small amount of primary air enters a primary air main pipe through an A cold primary air branch pipe and a B cold primary air branch pipe respectively to serve as a bypass of sealing air;
and thirdly, secondary air enters the A cold secondary air inlet and the B cold secondary air inlet respectively, then most secondary air enters the A secondary air channel and the B secondary air channel respectively, after being heated by the A air preheater and the B air preheater, the secondary air enters the A hot secondary air outlet and the B hot secondary air outlet respectively, a small amount of secondary air passes through the A secondary air bypass main pipe and the B secondary air bypass main pipe respectively, one path of secondary air enters the bottom of the hearth through the A secondary air bypass shunt pipeline and the B secondary air bypass shunt pipeline respectively, and the other path of secondary air passes through the A secondary air bypass branch pipe and the B secondary air bypass branch pipe respectively, and then enters the A hot secondary air outlet and the B hot secondary air outlet.
Compared with the prior art, the invention has the following advantages and effects:
1) The flue gas resistance conditions of the air preheater A and the air preheater B can be combined, and the opening of the flue gas baffle A and the opening of the flue gas baffle B can be reasonably adjusted, so that the flue gas quantity at two sides can be regulated and controlled, the flue gas quantity is increased aiming at the side with high flue gas resistance, the cold end temperature of the air preheater can be increased, and the situation of ammonium bisulfate deposition blockage is reduced;
2) The primary air bypass system is adopted, so that the primary air quantity entering the air preheater can be flexibly regulated, the cold end temperature 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) By adopting the secondary air bypass system, the secondary air quantity entering the air preheater can be flexibly regulated, the cold end temperature of the air preheater is improved, the resistance of the air preheater is reduced, the secondary air entering the bottom of the hearth can absorb slag heat, the smoke exhaust temperature is improved, the comprehensive temperature of the cold end of the air preheater is further improved, and the cold secondary air entering the hot secondary air channel can play a role in regulating the secondary air temperature.
Drawings
Fig. 1 is a schematic structural view of an embodiment of the present invention.
In the figure: the furnace 1, the air preheater inlet main flue 2, the air preheater 3, the air preheater 4, the A secondary air passage 5, the A flue gas baffle 6, the B flue gas baffle 7, the A air preheater inlet branch flue 8, the B air preheater inlet branch flue 9, the air preheater outlet main flue 10, the primary air main pipe 11, the primary air main pipe valve 12, the B secondary air passage 21, the B cold secondary air inlet 22, the B hot secondary air outlet 23, the B secondary air bypass main valve 24, the B secondary air bypass main pipe 25, the B secondary air bypass shunt valve 26, the B secondary air bypass shunt pipeline 27, the B secondary air bypass branch pipe 28, the B secondary air bypass branch pipe valve 29, the B primary air passage 31, the B cold primary air inlet 32, the B hot primary air outlet 33, the B cold primary air branch pipe 34, the B cold primary air branch pipe valve 35, the A cold secondary air inlet 41, the A hot secondary air outlet 42, the A secondary air bypass main pipe 43, the A secondary air bypass main pipe 44, the A secondary air bypass shunt valve 45, the A secondary air bypass shunt pipeline 46, the A secondary air bypass branch pipeline 47, the A secondary air bypass branch pipe 47, the A primary air branch pipe 48, the A primary air branch pipe 54, the A primary air outlet 54, the A and the A hot air passage 54.
Detailed Description
The present invention will be described in further detail by way of examples with reference to the accompanying drawings, which are illustrative of the present invention and not limited to the following examples.
Referring to fig. 1, the system for preventing the air preheater of the coal-fired power plant from being blocked in the embodiment comprises a hearth 1, an air preheater 4, an air preheater 3, 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 a flue gas baffle 6, an air preheater inlet sub flue 7, an air preheater inlet sub flue 8, an air preheater 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 duct 51, an A cold primary air branch pipe 54, a B primary air duct 31 and a B cold primary air branch pipe 34; the overgrate air system comprises an A overgrate air channel 5, an A overgrate air bypass main pipe 44, an A overgrate air bypass branch pipe 46, an A overgrate air bypass branch pipe 47, a B overgrate air channel 21, a B overgrate air bypass main pipe 25, a B overgrate air bypass branch pipe 27 and a B overgrate 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 pass through the A air preheater 4 and the B air preheater 3 and are communicated with an air preheater outlet main flue 10; the flue gas baffle 6 and the flue gas baffle 7 are respectively arranged in the inlet branch flue 8 of the air preheater and the inlet branch flue 9 of the air preheater, the air preheater 4 and the air preheater 3 are respectively in a three-division bin type, the two ends of the A primary air duct 51 are respectively provided with an A cold primary air inlet 52 and an A hot primary air outlet 53, the two ends of the B primary air duct 31 are respectively provided with a B cold primary air inlet 32 and a B hot primary air outlet 33, the two ends of the A secondary air duct 5 are respectively provided with an A cold secondary air inlet 41 and an A hot secondary air outlet 42, the two ends of the 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 primary air pipe 11 through an A cold primary air branch pipe 54 and a B cold primary air branch pipe 34, the primary air pipe 11 is connected with a sealing air branch pipe 54, the B cold primary air branch pipe 34, the primary air pipe 11 is respectively provided with an A cold primary air branch pipe valve 55, the B primary air branch valve 35, the A cold primary air pipe valve 12 and the A secondary air pipe 11 extend upwards from the bottom of the air preheater 21 to the air duct 3B and the air preheater 3 is extended upwards from the bottom of the air preheater and the air duct 3; a cold secondary air inlet 41 is respectively communicated with an A secondary air bypass branch pipe 46 and an A secondary air bypass branch pipe 47 through an A secondary air bypass main pipe 44, B cold secondary air inlet 22 is respectively communicated with a B secondary air bypass branch pipe 27 and a B secondary air bypass branch pipe 28 through a B secondary air bypass main pipe 25, A secondary air bypass main pipe 44, A secondary air bypass branch pipe 46 and A secondary air bypass branch pipe 47 are respectively provided with an A secondary air bypass main valve 43, an A secondary air bypass branch valve 45 and an A secondary air bypass branch pipe valve 48, B secondary air bypass main pipe 25, B secondary air bypass branch pipe 27 and B secondary air bypass branch pipe 28 are respectively provided with a B secondary air bypass main valve 24, a B secondary air bypass branch pipe valve 29, and outlets of the A secondary air bypass branch pipe 47 and the B secondary air bypass branch pipe 28 are respectively communicated with an A secondary air channel 5 and a B secondary air channel 21, and outlets of the A secondary air bypass pipe 46 and the B secondary air bypass branch pipe 27 are respectively communicated with the bottom of a hearth 1.
The working method comprises the following steps:
according to the flue gas resistance conditions of the air pre-heater 4 and the air pre-heater 3, opening degrees of the flue gas baffle 6 and the flue gas baffle 7 are reasonably adjusted, the flue gas quantity of the inlet branch flues of the air pre-heaters on two sides is regulated, the flue gas quantity is increased on one side with high flue gas resistance, the cold end temperatures of the air pre-heater 4 and the air pre-heater 3 are increased, and the occurrence of ammonium bisulfate deposition blockage is reduced;
secondly, primary air enters the A-cool primary air inlet 52 and the B-cool primary air inlet 32 respectively, then most of primary air enters the A-primary air duct 51 and the B-primary air duct 31 respectively, and enters the A-heat primary air outlet 53 and the B-heat primary air outlet 33 respectively after being heated by the A-air preheater 4 and the B-air preheater 3, and a small amount of primary air enters the primary air mother pipe 11 through the A-cool primary air branch pipe 54 and the B-cool primary air branch pipe 34 respectively to serve as a bypass of sealing air;
and thirdly, secondary air enters the A cold secondary air inlet 41 and the B cold secondary air inlet 22 respectively, then most of the secondary air enters the A secondary air channel 5 and the B secondary air channel 21 respectively, and enters the A hot secondary air outlet 42 and the B hot secondary air outlet 23 respectively after being heated by the A air preheater 4 and the B air preheater 3, a small amount of secondary air passes through the A secondary air bypass main pipe 44 and the B secondary air bypass main pipe 25 respectively, then one path of secondary air enters the bottom of the hearth 1 through the A secondary air bypass shunt pipeline 46 and the B secondary air bypass shunt pipeline 27 respectively, and the other path of secondary air passes through the A secondary air bypass branch pipe 47 and the B secondary air bypass branch pipe 28 respectively, and then enters the A hot secondary air outlet 42 and the B hot secondary air outlet 23.
What is not described in detail in this specification is all that is known to those skilled in the art.
Although the present invention has been described with reference to the above embodiments, it should be understood that the invention is not limited to the embodiments described above, but is capable of modification and variation without departing from the spirit and scope of the present invention.
Claims (1)
1. The working method of the system for preventing the blockage of the air preheater of the coal-fired power plant comprises a hearth (1), an A air preheater (4) and a B air preheater (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 total flue (2), 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) and an air preheater outlet total 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 channel (5), an A secondary air bypass main pipe (44), an A secondary air bypass branch pipe (46), an A secondary air bypass branch pipe (47), a B secondary air channel (21), a B secondary air bypass main pipe (25), a B secondary air bypass branch pipe (27) and a B secondary air bypass branch pipe (28); the air preheater inlet main flue (2) is respectively communicated with the air preheater inlet sub-flue (8) and the air preheater inlet sub-flue (9), and the air preheater inlet sub-flue (8) and the air preheater inlet sub-flue (9) respectively pass through the air preheater (4) and the air preheater (3) and are communicated with the air preheater outlet main flue (10); the A flue gas baffle (6) and the B flue gas baffle (7) are respectively arranged in an inlet branch flue (8) of the A air preheater and an inlet branch flue (9) of the B air preheater, the A air preheater (4) and the B air preheater (3) are both in three-branch bins, two ends of the 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 the B primary air duct (31) are respectively provided with a B cold primary air inlet (32) and a B hot primary air outlet (42), two ends of the 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 the 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 a primary air duct (54) and a B cold primary air duct (34) through a primary air valve (54) and a primary air duct (34), the two ends of the A secondary air duct (21) are respectively provided with a primary air duct (35) and a primary air duct (35), the primary air duct A (51) and the secondary air duct A (5) penetrate through the air preheater A (4) from the bottom and extend upwards, and the primary air duct B (31) and the secondary air duct B (21) penetrate through the air preheater B (3) from the bottom and extend upwards; the cold secondary air inlet (41) is respectively communicated with the secondary air bypass branch pipe (46) and the secondary air bypass branch pipe (47) through the secondary air bypass main pipe (44), the cold secondary air inlet (22) is respectively communicated with the secondary air bypass branch pipe (27) and the secondary air bypass branch pipe (28) through the secondary air bypass main pipe (25), the secondary air bypass main pipe (44), the secondary air bypass branch pipe (46) and the secondary air bypass branch pipe (47) are respectively provided with the secondary air bypass main valve (43), the secondary air bypass branch valve (45) and the secondary air bypass branch pipe valve (48), the secondary air bypass main pipe (25), the secondary air bypass branch pipe (27) and the secondary air bypass branch pipe (28) are respectively provided with the secondary air bypass main valve (24), the secondary air bypass branch valve (26) and the secondary air bypass branch pipe valve (29), and the secondary air bypass branch pipe (47) outlets are respectively communicated with the secondary air bypass pipe (5) and the secondary air bypass pipe (21) and the hearth (1) respectively; the primary air mother pipe (11) is connected with the sealed air branch pipe;
the working method comprises the following steps:
according to the flue gas resistance conditions of the air preheater (4) and the air preheater (3), the opening of the flue gas baffle (6) and the opening of the flue gas baffle (7) are reasonably adjusted, the flue gas quantity of the split flues at the inlets of the air preheaters at the two sides are regulated, so that the flue gas quantity is increased at the side with high flue gas resistance, the cold end temperature of the air preheater (4) and the cold end temperature of the air preheater (3) are increased, and the occurrence of ammonium bisulfate deposition blockage is reduced;
secondly, primary air enters an A-cooled primary air inlet (52) and a B-cooled primary air inlet (32) respectively, most of the primary air enters an A-primary air duct (51) and a B-primary air duct (31) respectively, and enters an A-hot primary air outlet (53) and a B-hot primary air outlet (33) respectively after being heated by an A-air preheater (4) and a B-air preheater (3), and a small amount of primary air enters a primary air mother pipe (11) through an A-cooled primary air branch pipe (54) and a B-cooled primary air branch pipe (34) respectively to serve as a bypass of sealing air;
step three, secondary air respectively enters an A cold secondary air inlet (41) and a B cold secondary air inlet (22), then most secondary air respectively enters an A secondary air channel (5) and a B secondary air channel (21), after being heated by an A air preheater (4) and a B air preheater (3), the secondary air respectively enters an A hot secondary air outlet (42) and a B hot secondary air outlet (23), 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), one path of secondary air respectively enters the bottom of a hearth (1) through an A secondary air bypass shunt pipeline (46) and a B secondary air bypass shunt 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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| 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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