CN217082613U - System for treating blockage of air preheater and reducing flue pressure - Google Patents
System for treating blockage of air preheater and reducing flue pressure Download PDFInfo
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- CN217082613U CN217082613U CN202123282688.1U CN202123282688U CN217082613U CN 217082613 U CN217082613 U CN 217082613U CN 202123282688 U CN202123282688 U CN 202123282688U CN 217082613 U CN217082613 U CN 217082613U
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- flue gas
- air
- flue
- outlet
- heat exchanger
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 207
- 239000003546 flue gas Substances 0.000 claims abstract description 207
- 239000000428 dust Substances 0.000 claims abstract description 74
- 239000000779 smoke Substances 0.000 claims abstract description 41
- 239000007789 gas Substances 0.000 claims description 16
- 230000009467 reduction Effects 0.000 claims description 11
- 230000000903 blocking effect Effects 0.000 claims 2
- BIGPRXCJEDHCLP-UHFFFAOYSA-N ammonium bisulfate Chemical compound [NH4+].OS([O-])(=O)=O BIGPRXCJEDHCLP-UHFFFAOYSA-N 0.000 abstract description 13
- 238000000034 method Methods 0.000 description 9
- 238000007664 blowing Methods 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 239000004071 soot Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 238000009825 accumulation Methods 0.000 description 1
- 229910021529 ammonia Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000002146 bilateral effect Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000006477 desulfuration reaction Methods 0.000 description 1
- 230000023556 desulfurization Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 206010022000 influenza Diseases 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000003584 silencer Effects 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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- Chimneys And Flues (AREA)
- Air Supply (AREA)
Abstract
The utility model relates to a flue gas carries technical field, discloses a system for handle air heater and block up and reduce flue pressure, include: the smoke heat exchanger comprises a smoke cavity and an air cavity; an inlet of a flue gas cavity of the flue gas heat exchanger is communicated with the denitration reactor, and an outlet of the flue gas cavity is communicated with the electric dust removal device; an inlet of an air cavity of the flue gas heat exchanger is communicated with the air feeder, and an outlet of the air cavity is communicated to the hot secondary air box; a flue pressure adjusting baffle plate for controlling the flow of flue gas is arranged between the denitration reactor and the flue gas cavity of the flue gas heat exchanger; and a secondary air temperature adjusting baffle plate for controlling the air quantity is arranged between the hot secondary air box and the air cavity of the flue gas heat exchanger. The utility model discloses a system has realized the UNICOM of two side wind channels of boiler, flue, has improved the load carrying capacity when the single fan operation of boiler to smoke heat exchanger export flue gas temperature is controlled easily, can not take place ammonium bisulfate and block up the scheduling problem.
Description
Technical Field
The utility model relates to a technical field is carried to the flue gas, and more specifically the system that says so relates to a handle air heater and block up and reduce flue pressure.
Background
In order to ensure that fuel can be normally combusted in a furnace, air required by fuel combustion must be fed into a hearth of the air supply system of the existing coal-fired boiler air flue system, a blower is used for overcoming flow resistance generated by an air duct, an air preheater and a combustor, and providing oxygen required by fuel combustion. The secondary air flow comprises the following steps: air vertically enters two axial flow blowers through a filter screen and a silencer to be pressurized, then enters the air preheater through a secondary wind power dynamic baffle at an inlet of the air preheater, then enters secondary wind bins of two gram type three-bin air preheaters through a secondary wind channel to be preheated into hot secondary wind, and then is conveyed to a boiler hot secondary wind box through a hot secondary wind power dynamic baffle at an outlet of the air preheater to enter a hearth for combustion supporting. Flue gas system of boilerThe system comprises a hearth tail flue, a denitration reactor, an air preheater, an electric dust collector, a flue gas cavity, a flue gas electric dust and a flue gas cavity, a flue gas electric dust and a flue gas inlet, a flue gas electric dust removing device and a flue gas inlet, a 2 And then discharged to the atmosphere through a chimney.
Flue gas discharged by a coal-fired boiler can be discharged to the atmosphere after being subjected to denitration, desulfurization and dust removal equipment, a large amount of ammonium bisulfate is accumulated at the cold end of an air preheater due to excessive ammonia escape in the flue gas denitration process of the boiler, the air preheater is easy to block, the heat exchange efficiency of the air preheater is low, the smoke discharge temperature is high, the negative pressure fluctuation of a hearth is large, the current of a draught fan is large, the fan stalls, the boiler faces the risk of fire extinguishment, and the boiler efficiency is low; in addition, the flue pressure at the inlet of the induced draft fan is over-low during high load, and the boiler flue is deformed or broken, so that the load of the boiler has to be reduced.
Currently, the reduction of the differential pressure of the air preheater is mainly performed by the following method: firstly, strengthening steam soot blowing, namely increasing the soot blowing steam pressure and increasing the steam soot blowing frequency, but the problem of large differential pressure of an air preheater still cannot be improved; secondly, because the air-smoke system of the medium-large coal-fired boiler basically adopts double-row arrangement and a balanced ventilation mode, the pressure difference of the air preheater is reduced by increasing the outlet temperature of a single-side air preheater to more than 160 ℃ to melt ammonium bisulfate (ammonium bisulfate melting point of 147 ℃), particularly taking the improvement of the outlet temperature of the A air preheater as an example, the output of an A draught fan is increased, the output of an A draught fan is reduced, and a large amount of smoke is heated by a small amount of cold air to improve the smoke temperature at the outlet of the air preheater, but the method has the defects in the practical application of a thermal power plant that when the air supply quantity and the smoke quantity of the A side of the boiler are adjusted to improve the outlet temperature of the A side air preheater to melt ammonium bisulfate, the outlet temperature of the B air preheater is reduced to below 80 ℃ due to large air supply quantity and small smoke quantity of the boiler, and the accumulation and blockage of the ammonium bisulfate of the B side air preheater are aggravated on the contrary, the differential pressure of the air preheater is further increased, so that the effect of reducing the differential pressure of the air preheater by adopting the method is not ideal. Thirdly, the air preheater carries out high-pressure water washing on line to clean the blockage of the air preheater, the high-pressure water damages a heat exchange element of the air preheater, the cold impact causes the deformation of a rotor of the air preheater to generate abrasion and blockage, and in addition, the sprayed water raises the dew point of the flue gas.
SUMMERY OF THE UTILITY MODEL
The utility model discloses aim at solving air preheater ammonium bisulfate and blockking up and flue pressure transfinites the problem that can not take rated load.
An object of the utility model is to provide a system for handle air heater and block up and reduce flue pressure, include:
the smoke heat exchanger comprises a smoke cavity and an air cavity;
an inlet of a flue gas cavity of the flue gas heat exchanger is communicated with the denitration reactor, and an outlet of the flue gas cavity is communicated with the electric dust removal device; an inlet of an air cavity of the flue gas heat exchanger is communicated with the air feeder, and an outlet of the air cavity is communicated to the hot secondary air box;
a flue pressure adjusting baffle plate for controlling the flow of flue gas is arranged between the denitration reactor and the flue gas cavity of the flue gas heat exchanger; and a secondary air temperature adjusting baffle plate for controlling the air quantity is arranged between the hot secondary air box and the air cavity of the flue gas heat exchanger.
Preferably, an electric baffle is arranged at the position, close to the outlet, of the air feeder, and a pneumatic adjusting baffle is arranged between the electric baffle of the air feeder and the air cavity of the flue gas heat exchanger and used for adjusting the air volume of the air cavity of the flue gas heat exchanger;
electric baffle is arranged at the outlet of the electric dust removal device, and a pneumatic adjusting baffle is arranged between the electric dust removal device and the flue gas heat exchanger and used for adjusting the flow of flue gas at the outlet of a tail flue of the boiler.
Preferably, the flue gas heat exchanger is a shell-and-tube flue gas heat exchanger.
Preferably, the denitration reactor the electric dust collector the forced draught blower all is provided with at least two for the cooperation is carried the flue gas that a plurality of exhanst outlets in boiler afterbody produced.
Preferably, the denitration reactor comprises a first denitration reactor and a second denitration reactor;
the inlet of the first denitration reactor is communicated with the flue outlet at the A side of the tail part of the boiler, and the inlet of the second denitration reactor is communicated with the flue outlet at the B side of the tail part of the boiler;
and outlet pipelines of the first denitration reactor and the second denitration reactor are converged to the same pipeline and then communicated to a smoke gas cavity of the smoke gas heat exchanger.
Preferably, the electric dust removal device comprises a first electric dust removal device and a second electric dust removal device;
an inlet of the first electric dust removal device is communicated with an outlet of a flue gas cavity of the flue gas heat exchanger and is used for conveying flue gas at an outlet of a flue at the A side of the tail part of the boiler; and the inlet of the second electric dust removal device is communicated with the outlet of the flue gas cavity of the flue gas heat exchanger and is used for conveying flue gas at the outlet of a flue at the side B of the tail part of the boiler.
Preferably, the flue gas passing through the flue gas cavity of the flue gas heat exchanger is output by the same pipeline and then is shunted to the first electric dust removal device and the second electric dust removal device through different pipelines.
Preferably, the blower includes a first blower and a second blower; generally, air from a blower in a boiler system is called secondary air;
and air supply pipelines of the first air blower and the second air blower are converged to the same pipeline and then communicated to an air cavity of the flue gas heat exchanger.
Preferably, the system further comprises:
the second air preheater is provided with a second air bin and a flue gas bin, the inlet of the flue gas bin of the second air preheater is communicated with the second denitration reactor, and the outlet of the flue gas bin of the second air preheater is communicated to the second electric dust removal device;
the second air preheater is provided with a secondary air bin and a flue gas bin; and the inlet of a flue gas bin of the second air preheater is communicated with the second denitration reactor, and the outlet of the second air preheater is communicated to the second electric dust removal device, and the inlet of a secondary air bin of the second air preheater is communicated with the second air feeder, and the outlet of the secondary air bin is communicated to the hot secondary air box.
Preferably, the system further comprises:
the first induced draft fan is communicated with an outlet of the first electric dust removal device and is used for conveying flue gas at an outlet of a flue at the A side of the tail part of the boiler;
and the second induced draft fan is communicated with an outlet of the second electric dust removal device and is used for conveying flue gas at a flue outlet at the side B of the tail part of the boiler.
Preferably, the first air blower and the second air blower are provided with electric baffles close to the outlet; a pneumatic adjusting baffle is arranged between an electric baffle of the first air blower and the air cavity of the flue gas heat exchanger and is used for adjusting the air volume of the first air blower entering the air cavity of the flue gas heat exchanger; and a pneumatic adjusting baffle is arranged between the electric baffle of the second air feeder and the air cavity of the flue gas heat exchanger and is used for adjusting the air volume of the second air feeder entering the air cavity of the flue gas heat exchanger.
Preferably, electric baffles are arranged at the outlets of the first electric dust removal device and the second electric dust removal device; a pneumatic adjusting baffle is arranged between the first electric dust removal device and the flue gas heat exchanger and is used for adjusting the flow of flue gas at the outlet of a flue at the A side of the tail part of the boiler; and a pneumatic adjusting baffle is arranged between the second electric dust removal device and the flue gas heat exchanger and used for adjusting the flow of flue gas at the B side flue outlet of the tail part of the boiler.
Preferably, pneumatic adjusting baffles are arranged among the first denitration reactor, the second denitration reactor and the flue pressure adjusting baffle and are used for extracting high-temperature flue gas into the flue gas heat exchanger.
Preferably, the pressure gauge is arranged on the inlet side close to the first electric dust removal device and used for measuring the flue pressure at the A side of the tail part of the boiler, and the pressure gauge is arranged on the inlet side close to the second electric dust removal device and used for measuring the flue pressure at the B side of the tail part of the boiler.
Preferably, a temperature measuring device is arranged close to the outlet side of the air cavity of the flue gas heat exchanger and used for measuring the temperature of secondary air at the outlet of the flue gas heat exchanger.
Preferably, an electric baffle is arranged between the first denitration reactor and the flue gas bin of the first air preheater and is used for isolating flue gas at the outlet of a flue at the A side of the tail part of the boiler from entering the flue gas bin of the first air preheater; and an electric baffle plate is arranged between the hot secondary air box and the secondary air bin of the first air preheater and is used for isolating heat and leading secondary air to flow backwards and enter the secondary air bin of the first air preheater.
An electric baffle plate is arranged between the second denitration reactor and the flue gas bin of the second air preheater and is used for isolating flue gas at the outlet of a flue at the side B of the tail part of the boiler from entering the flue gas bin of the second air preheater; and an electric baffle plate is arranged between the hot secondary air box and the secondary air bin of the second air preheater and is used for isolating heat and leading secondary air to flow backwards and enter the secondary air bin of the second air preheater.
The utility model discloses a method for above-mentioned system handles air heater and blocks up and reduce flue pressure, including following step:
(1) flue gas at the side of the boiler tail A, B passes through denitration reactors at two sides respectively to remove NOx, the denitration treated flue gas passes through a pneumatic adjusting baffle to extract high-temperature flue gas, then passes through a flue pressure adjusting baffle to be sent into a flue gas cavity of a flue gas heat exchanger to exchange heat, and the low-temperature flue gas after heat exchange passes through the pneumatic adjusting baffle to be introduced into electric dust removal devices at two sides respectively;
(2) the cold secondary air is extracted from the outlet electric baffles of the air blowers on the two sides, the cold secondary air is sent into the air cavity of the flue gas heat exchanger for heat exchange through the pneumatic adjusting baffles on the two sides, and the heated secondary air returns to the hot secondary air box after passing through the secondary air temperature adjusting baffle and the secondary air pneumatic adjusting baffle.
The utility model provides a system for handle air heater and block up and reduce flue pressure, compare with prior art, its beneficial effect lies in:
the utility model solves the problem that the flue pressure of the unit is over-limit and can not carry rated load due to the reasons of high differential pressure of the air preheater or blockage of accumulated dust in the flue and the like;
the utility model discloses a system has realized the UNICOM of two side wind channels of boiler, flue, has improved the load carrying capacity when the single fan operation of boiler to smoke heat exchanger export flue gas temperature is controlled easily, can not take place ammonium bisulfate and block up the scheduling problem, has fine application prospect to coal fired boiler.
Drawings
Fig. 1 is a schematic flow diagram of the system of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it should be understood that the described embodiments are only some embodiments of the present invention, but not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
A system for handling air preheater plugging and flue pressure reduction, comprising:
the smoke heat exchanger comprises a smoke cavity and an air cavity;
an inlet of a flue gas cavity of the flue gas heat exchanger is communicated with the denitration reactor, and an outlet of the flue gas cavity is communicated with the electric dust removal device; an inlet of an air cavity of the flue gas heat exchanger is communicated with the air feeder, and an outlet of the air cavity is communicated to the hot secondary air box;
a flue pressure adjusting baffle plate for controlling the flow of flue gas is arranged between the denitration reactor and the flue gas cavity of the flue gas heat exchanger; and a secondary air temperature adjusting baffle plate for controlling the air quantity is arranged between the hot secondary air box and the air cavity of the flue gas heat exchanger.
Preferably, an electric baffle is arranged at the position, close to the outlet, of the air feeder, and a pneumatic adjusting baffle is arranged between the electric baffle of the air feeder and the air cavity of the flue gas heat exchanger and used for adjusting the air volume of the air cavity of the flue gas heat exchanger;
electric baffle is arranged at the outlet of the electric dust removal device, and a pneumatic adjusting baffle is arranged between the electric dust removal device and the flue gas heat exchanger and used for adjusting the flow of flue gas at the outlet of a tail flue of the boiler.
In order to further optimize the technical scheme, the flue gas heat exchanger is a shell-and-tube flue gas heat exchanger.
As shown in fig. 1, in some embodiments of the present invention, the denitration reactor, the electric dust collector, the blower are provided with two for cooperating to convey the flue gas generated by a plurality of flue outlets at the tail of the boiler.
Wherein the denitration reactor comprises a first denitration reactor and a second denitration reactor;
the inlet of the first denitration reactor is communicated with the flue outlet at the A side of the tail part of the boiler, and the inlet of the second denitration reactor is communicated with the flue outlet at the B side of the tail part of the boiler;
and outlet pipelines of the first denitration reactor and the second denitration reactor are converged to the same pipeline and then communicated to a smoke gas cavity of the smoke gas heat exchanger.
In some embodiments of the present invention, the electric dust removing device comprises a first electric dust removing device and a second electric dust removing device;
an inlet of the first electric dust removal device is communicated with an outlet of a flue gas cavity of the flue gas heat exchanger and is used for conveying flue gas at an outlet of a flue at the A side of the tail part of the boiler; and the inlet of the second electric dust removal device is communicated with the outlet of the flue gas cavity of the flue gas heat exchanger and is used for conveying flue gas at the outlet of a flue at the side B of the tail part of the boiler.
In some embodiments of the present invention, the flue gas in the flue gas chamber of the flue gas heat exchanger is output by the same pipeline and then shunted to the first electric dust collector and the second electric dust collector through different pipelines.
In some embodiments of the present invention, the blower includes a first blower and a second blower;
and air supply pipelines of the first air blower and the second air blower are converged to the same pipeline and then communicated to an air cavity of the flue gas heat exchanger.
In some embodiments of the present invention, the system further comprises:
the second air preheater is provided with a second air bin and a flue gas bin, the inlet of the flue gas bin of the second air preheater is communicated with the second denitration reactor, and the outlet of the flue gas bin of the second air preheater is communicated to the second electric dust removal device;
the second air preheater is provided with a secondary air bin and a flue gas bin; and the inlet of a flue gas bin of the second air preheater is communicated with the second denitration reactor, and the outlet of the second air preheater is communicated to the second electric dust removal device, and the inlet of a secondary air bin of the second air preheater is communicated with the second air feeder, and the outlet of the secondary air bin is communicated to the hot secondary air box.
In some embodiments of the present invention, the system further comprises:
the first induced draft fan is communicated with an outlet of the first electric dust removal device and is used for conveying flue gas at an outlet of a flue at the A side of the tail part of the boiler;
and the second induced draft fan is communicated with an outlet of the second electric dust removal device and is used for conveying flue gas at a flue outlet at the side B of the tail part of the boiler.
In some embodiments of the present invention, the first blower and the second blower are provided with electric baffles 1, 3 near the outlet for isolating the blowers; a pneumatic adjusting baffle plate 9 is arranged between the electric baffle 1 of the first air feeder and the air cavity of the flue gas heat exchanger and is used for adjusting the air volume of the first air feeder entering the air cavity of the flue gas heat exchanger; and a pneumatic adjusting baffle 12 is arranged between the electric baffle 3 of the second air feeder and the air cavity of the flue gas heat exchanger and is used for adjusting the air volume of the second air feeder entering the air cavity of the flue gas heat exchanger.
In some embodiments of the present invention, the outlets of the first electric dust collector and the second electric dust collector are provided with electric baffles 6 and 8; a pneumatic adjusting baffle 14 is arranged between the first electric dust removal device and the flue gas heat exchanger and is used for adjusting the flow of flue gas at the outlet of a flue at the A side of the tail part of the boiler; and a pneumatic adjusting baffle 16 is arranged between the second electric dust removal device and the flue gas heat exchanger and used for adjusting the flow of flue gas at the outlet of a B-side flue at the tail part of the boiler.
In some embodiments of the present invention, the first denitration reactor, the second denitration reactor and the flue pressure adjusting baffle 17 are provided with pneumatic adjusting baffles 13 and 15 therebetween for extracting high temperature flue gas to the flue gas heat exchanger.
The utility model discloses an in some embodiments, be close to first electric dust collector's entrance side is provided with the manometer for survey boiler afterbody A side flue pressure, be close to second electric dust collector's entrance side is provided with the manometer for survey boiler afterbody B side flue pressure.
The utility model discloses an in some embodiments, be close to the outlet side of gas heater air chamber is provided with temperature measuring device, is used for the survey the overgrate air temperature of gas heater export.
In some embodiments of the present invention, an electric baffle 5 is disposed between the first denitration reactor and the flue gas bin of the first air preheater, and is used for isolating flue gas at the outlet of the flue at the side a of the tail of the boiler from entering the flue gas bin of the first air preheater; and an electric baffle 2 is arranged between the hot secondary air box and the secondary air bin of the first air preheater and is used for isolating hot secondary air from flowing back to enter the secondary air bin of the first air preheater.
An electric baffle 7 is arranged between the second denitration reactor and the flue gas bin of the second air preheater and is used for isolating flue gas at the outlet of a flue at the side B of the tail part of the boiler from entering the flue gas bin of the second air preheater; and an electric baffle 4 is arranged between the hot secondary air box and the secondary air bin of the second air preheater and is used for isolating heat and leading secondary air to flow back and enter the secondary air bin of the second air preheater.
Based on the utility model discloses the system for processing air heater blocks up and reduce flue pressure that above-mentioned embodiment provided, the method of processing air heater blocks up and reduce flue pressure, including following step:
(1) flue gas at the side of the boiler tail A, B passes through denitration reactors at two sides respectively to remove NOx, the denitration treated flue gas passes through a pneumatic adjusting baffle to extract high-temperature flue gas, then passes through a flue pressure adjusting baffle to be sent into a flue gas cavity of a flue gas heat exchanger to exchange heat, and the low-temperature flue gas after heat exchange passes through the pneumatic adjusting baffle to be introduced into electric dust removal devices at two sides respectively;
(2) the cold secondary air is extracted from the outlet electric baffles of the air blowers on the two sides, the cold secondary air is sent into the air cavity of the flue gas heat exchanger for heat exchange through the pneumatic adjusting baffles on the two sides, and the heated secondary air returns to the hot secondary air box after passing through the secondary air temperature adjusting baffle and the secondary air pneumatic adjusting baffle.
In particular, the following description will be made in detail with reference to specific operating conditions, in order to explain the application of the system for treating air preheater blockage and reducing flue pressure according to the present invention.
First, the utility model provides a unit improve during unilateral air preheater export temperature reduces differential pressure that the opposite side air preheater export smoke temperature crosses low problem on line.
Taking the example that the single-side air preheater is heated to melt ammonium bisulfate to reduce the differential pressure of the first air preheater, properly reducing the output of the first air feeder, improving the output of the first draught fan, improving the output smoke temperature of the first air preheater, simultaneously improving the output of the second air feeder, reducing the output of the second draught fan, reducing the output smoke temperature of the second air preheater, controlling the output smoke temperature of the second air preheater not to be lower than the smoke dew point in the adjusting process, opening the second denitration reactor to a pneumatic adjusting baffle 15 of the smoke gas cavity of the smoke gas heat exchanger and pneumatic adjusting baffles 14 and 16 of the smoke gas cavity of the smoke gas heat exchanger to the two sides of the inlet of the electric dust removal device, then opening a pneumatic adjusting baffle 9 between the outlet of the first air feeder and the smoke gas cavity of the smoke gas heat exchanger and a pneumatic adjusting baffle 10 of the smoke gas cavity of the smoke gas heat exchanger to the hot secondary air box, and adjusting a flue pressure adjusting baffle 17 to control the output smoke temperature of the second air preheater not to be lower than the smoke dew point, and adjusting a secondary air temperature adjusting baffle 11 to continuously increase the temperature of the cold end of the first air preheater, and flushing the molten ammonium bisulfate to carry the molten ammonium bisulfate to a rear flue by flue gas.
And after the differential pressure of the first air preheater is recovered to be normal, adjusting the output power of fans on two sides to be balanced, opening a pneumatic adjusting baffle 13 from a first denitration reactor of the boiler to the flue gas heat exchanger and a pneumatic adjusting baffle 12 from the outlet of a second air feeder to the flue gas heat exchanger, adjusting a flue pressure adjusting baffle 17 and a secondary air temperature adjusting baffle 11 to control the outlet flue gas temperature of the flue gas heat exchanger to be more than 160 ℃, melting ammonium bisulfate and taking away the ammonium bisulfate by flue gas, and after the differential pressure of the flue gas heat exchanger is normal, closing the opened valve to withdraw the operation of the flue gas heat exchanger.
Second, the utility model discloses can reduce the flue gas volume that flows through the air preheater and reduce afterbody flue negative pressure, solve the unit because the air preheater differential pressure is high or reasons such as flue deposition blocks up lead to flue pressure transfinite can not take rated load's problem.
When the flue pressure is ultra-low under high load, the pneumatic adjusting baffles 13 and 15 between the first denitration reactor and the flue gas cavity of the flue gas heat exchanger and between the second denitration reactor and the flue gas cavity of the flue gas heat exchanger, and the pneumatic adjusting baffles 14 and 16 between the flue gas heat exchanger and the two sides of the inlet of the electric dust removal device are opened, then the pneumatic adjusting baffles 9 and 12 between the outlets of the first air feeder and the second air feeder and the pneumatic adjusting baffle 10 between the flue gas heat exchanger and the hot secondary air box are opened, the flue pressure adjusting baffle 17 and the secondary air temperature adjusting baffle 11 are adjusted to control the flue gas temperature at the outlet of the flue gas heat exchanger, the flue gas flow rate of the first air preheater and the second air preheater is reduced by utilizing the advantage of good flue gas flow performance of the flue gas heat exchanger, the resistance of the air preheater is reduced, the negative pressure of the inlet flue of the induced draft fan is improved, the deformation and the tearing of the flue gas are avoided, and the power consumption of the primary air feeder and the induced draft fan is reduced, the efficiency of the boiler is improved, the load capacity of unit is improved simultaneously.
Third, the utility model discloses the system has realized the UNICOM of two side wind channels of boiler, flue, the load carrying capacity when having improved the single fan trouble of unit.
If the first induced draft fan is out of order, the electric flue gas baffle 6 at the inlet of the first induced draft fan is closed, the load capacity of the unilateral air-smoke system is lower than 50% under the influence of the differential pressure of the air preheater, and the air-smoke pipeline of the flue gas heat exchanger can realize bilateral operation of the air-smoke system. The flue gas pneumatic adjusting baffle 14 and 16 from the flue gas cavity of the flue gas heat exchanger to the two sides of the inlet of the electric dust removal device are opened, the high-temperature flue gas of the flue at the A side of the tail part of the boiler passes through the flue gas electric baffle 5 at the inlet of the first air preheater, the pneumatic adjusting baffle 14 and 16 of the flues at the two sides of the inlet of the electric dust removal device flow to the inlet pipeline of the second electric dust removal device, because the pipe diameter of the flue gas outlet of the flue gas heat exchanger is smaller, the output of the first air feeder and the primary air fan at the A side are properly reduced, the load capacity of the air-flue system of the boiler is only limited by the output of the second air draught fan, because the split flow of the first air preheater reduces the flue gas flow flux of the second air preheater, and the load capacity of the operation of a single fan is correspondingly improved.
Similarly, after the first air feeder is stopped due to faults, cold secondary air at the outlet of the second air feeder is heated by the first air preheater through the pneumatic adjusting baffle plates 12 and 9, and the cold primary air at the side A is heated at the same time, the load capacity of the air-smoke system is only limited by the output of the second air feeder, and the load capacity of the boiler is improved.
In addition, if the first air feeder and the first induced draft fan are subjected to fault maintenance at the same time, the load capacity of the fan is limited due to the influence of the differential pressure of the air preheater. Adjusting the operation mode of a primary air fan, wherein a primary air fan at the A side supplies cold primary air, a primary air fan at the B side supplies hot primary air, cold secondary air at the outlet of a second air feeder enters an air cavity of a flue gas heat exchanger through a pneumatic adjusting baffle 12 for heating, and then enters a hot secondary air box through a secondary air temperature adjusting baffle 11 and a pneumatic adjusting baffle 10 at the outlet of the flue gas heat exchanger, meanwhile, an outlet of a first denitration reactor is opened to extract high-temperature flue gas through a flue gas pneumatic adjusting baffle 13, and then the high-temperature flue gas is sent into the flue gas cavity of the flue gas heat exchanger through a tail flue pressure adjusting baffle 17, the low-temperature flue gas is introduced to an inlet flue of a second electric dust removal device through a pneumatic adjusting baffle 16 and is put into the flue gas heat exchanger for operation to split the secondary air at the B side, the load carrying capacity of the boiler is improved, and the flue gas at the A side of the boiler is circulated simultaneously depending on the output of the second air feeder and a second draught fan, the accident that the flue collapses caused by the fact that flue gas of the flue cannot circulate and accumulated dust after the first induced draft fan breaks down is avoided.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. For the scheme disclosed by the embodiment, the scheme corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A system for handling air preheater blockage and flue pressure reduction, comprising:
the smoke heat exchanger comprises a smoke cavity and an air cavity;
an inlet of a flue gas cavity of the flue gas heat exchanger is communicated with the denitration reactor, and an outlet of the flue gas cavity is communicated with the electric dust removal device; an inlet of an air cavity of the flue gas heat exchanger is communicated with the air feeder, and an outlet of the air cavity is communicated to the hot secondary air box;
a flue pressure adjusting baffle plate for controlling the flow of flue gas is arranged between the denitration reactor and the flue gas cavity of the flue gas heat exchanger; and a secondary air temperature adjusting baffle plate for controlling the air quantity is arranged between the hot secondary air box and the air cavity of the flue gas heat exchanger.
2. The system for handling air preheater clogging and flue pressure reduction of claim 1, wherein said blower is provided with an electrically operated damper adjacent to the outlet, and a pneumatically operated damper is provided between said blower electrically operated damper and said flue gas heat exchanger air chamber for adjusting the air volume in said flue gas heat exchanger air chamber.
3. The system for treating air preheater blocking and flue pressure reduction as claimed in claim 1, wherein an electric baffle is arranged at an outlet of the electric dust removal device, and a pneumatic adjusting baffle is arranged between the electric dust removal device and the flue gas heat exchanger for adjusting the flow of flue gas at an outlet of a tail flue of the boiler.
4. The system for treating air preheater blocking and flue pressure reduction of claim 1, 2 or 3, wherein the denitration reactor, the electric dust removal device and the blower are provided with at least two of the electric dust removal device and the blower for matching with flue gas generated by a plurality of flue outlets at the tail of the conveying boiler.
5. The system for treating air preheater blockage and flue pressure reduction of claim 4, wherein said denitration reactor comprises a first denitration reactor and a second denitration reactor;
the inlet of the first denitration reactor is communicated with the flue outlet at the A side of the tail part of the boiler, and the inlet of the second denitration reactor is communicated with the flue outlet at the B side of the tail part of the boiler;
and outlet pipelines of the first denitration reactor and the second denitration reactor are converged to the same pipeline and then communicated to a smoke gas cavity of the smoke gas heat exchanger.
6. The system for handling air preheater blockage and flue pressure reduction as recited in claim 5 wherein the electrical dust removal device comprises a first electrical dust removal device and a second electrical dust removal device;
an inlet of the first electric dust removal device is communicated with an outlet of a flue gas cavity of the flue gas heat exchanger and is used for conveying flue gas at an outlet of a flue at the A side of the tail part of the boiler; and the inlet of the second electric dust removal device is communicated with the outlet of the flue gas cavity of the flue gas heat exchanger and is used for conveying flue gas at the outlet of a B-side flue at the tail part of the boiler.
7. The system for treating air preheater blockage and reducing flue pressure as recited in claim 6, wherein flue gas passing through the flue gas chamber of the flue gas heat exchanger is output by the same pipeline and then is shunted to the first electric dust removal device and the second electric dust removal device through different pipelines.
8. The system for handling air preheater plugging and flue pressure reduction of claim 6, wherein said blower comprises a first blower and a second blower;
and air supply pipelines of the first air blower and the second air blower are converged to the same pipeline and then communicated to an air cavity of the flue gas heat exchanger.
9. The system for handling air preheater blockage and flue pressure reduction of claim 8, further comprising:
the second air preheater is provided with a second air bin and a flue gas bin, the inlet of the flue gas bin of the second air preheater is communicated with the second denitration reactor, and the outlet of the flue gas bin of the second air preheater is communicated to the second electric dust removal device;
the second air preheater is provided with a secondary air bin and a flue gas bin; and the inlet of a flue gas bin of the second air preheater is communicated with the second denitration reactor, and the outlet of the second air preheater is communicated to the second electric dust removal device, and the inlet of a secondary air bin of the second air preheater is communicated with the second air feeder, and the outlet of the secondary air bin is communicated to the hot secondary air box.
10. The system for handling air preheater blockage and flue pressure reduction of claim 9, further comprising:
the first induced draft fan is communicated with an outlet of the first electric dust removal device and is used for conveying flue gas at an outlet of a flue at the A side of the tail part of the boiler;
and the second induced draft fan is communicated with an outlet of the second electric dust removal device and is used for conveying flue gas at a flue outlet at the side B of the tail part of the boiler.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123282688.1U CN217082613U (en) | 2021-12-24 | 2021-12-24 | System for treating blockage of air preheater and reducing flue pressure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123282688.1U CN217082613U (en) | 2021-12-24 | 2021-12-24 | System for treating blockage of air preheater and reducing flue pressure |
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| CN217082613U true CN217082613U (en) | 2022-07-29 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413275A (en) * | 2021-12-24 | 2022-04-29 | 华能巢湖发电有限责任公司 | Method for treating blockage of air preheater and reducing flue pressure |
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2021
- 2021-12-24 CN CN202123282688.1U patent/CN217082613U/en not_active Withdrawn - After Issue
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114413275A (en) * | 2021-12-24 | 2022-04-29 | 华能巢湖发电有限责任公司 | Method for treating blockage of air preheater and reducing flue pressure |
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