CN107504479B - Combustor transformation device for solving low pressure of large bellows of low NOx combustor - Google Patents
Combustor transformation device for solving low pressure of large bellows of low NOx combustor Download PDFInfo
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- CN107504479B CN107504479B CN201710761299.6A CN201710761299A CN107504479B CN 107504479 B CN107504479 B CN 107504479B CN 201710761299 A CN201710761299 A CN 201710761299A CN 107504479 B CN107504479 B CN 107504479B
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- secondary air
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
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- 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
Abstract
The invention relates to a burner reconstruction device for solving the problem of low pressure of a large bellows of a low NOx burner, which comprises the following components: at least one layer of secondary air box partition plate is arranged in each secondary air box, one end of the secondary air box partition plate is connected with a secondary air nozzle, the other end of the secondary air box partition plate is hinged with a baffle plate, the baffle plate is connected with a crank arranged outside the secondary air box, clockwise and/or anticlockwise rotation between 0 DEG and 90 DEG is carried out through the crank adjustment baffle plate, at least one layer of nozzle secondary partition plate is also arranged in the secondary air nozzle communicated with the secondary air box, the nozzle partition plate extends from an air inlet to an air outlet, and the nozzle partition plate at the air inlet is arranged at a position corresponding to the secondary air box partition plate.
Description
Technical Field
The invention relates to a burner reconstruction device for solving the problem of low pressure of a large bellows of a low NOx burner.
Background
Along with the increasingly stricter environmental emission indexes, denitration transformation work is carried out on the power plants, and the vast majority of power plants correspondingly transform low NOx burners so as to reduce the NOx content at the outlet of a hearth and lighten the working pressure of a denitration system device. The general scheme for reforming the low NOx burner is that 25-30% of the total air quantity is extracted and moved to the upper region of the burner to form SOFA air (also called over-fire air), so that two pulverized coal combustion regions, namely a main combustion region and an over-fire region (SOFA air region), are formed, the excess air coefficient of the main burner region is generally kept at about 0.85, the pulverized coal is in an anoxic combustion state, the temperature and the oxidizing atmosphere of a hearth are reduced, and the NOx is actually reduced.
Because the low NOx combustor relies on original combustor to go on when reforming transform, consequently the change to former combustor overgrate air case and spout is less, when just so having caused SOFA wind combustor to send a large amount of wind, big bellows pressure reduces too much, can't maintain even to derive following problem:
at high load, most of air quantity is formed by an SOFA burner at the upper part, the opening degree of an air door of a secondary air burner at the lower part is smaller, the resistance is larger, the speed of a secondary air nozzle is lower, and the rigidity of secondary air is weaker and normal combustion cannot be organized;
at 50% low load, there is a general phenomenon of low pressure in the large bellows, so that the SOFA damper at the upper layer is forced to be closed for ensuring the pressure of the bellows at low load, so that the burner area returns to the oxygen-enriched combustion state again, and the NOx emission value at the outlet of the hearth is increased.
For the boiler burning lean coal, because the lower main combustion area lacks air, and the secondary air has weak rigidity and poor combustion structure, the problem of larger flying ash combustible matters can occur, even the phenomenon that the higher the load is, the larger the flying ash combustible matters are, and the efficiency of the boiler is affected.
Because the NOx emission value at the outlet of the hearth is contradictory with the larger combustible fly ash, great difficulty exists in the aspect of operation adjustment of the boiler. In order to ensure that the fly ash value is within a certain range, some power plants are forced to increase the NOx emission value at the outlet of the hearth, and the ammonia injection amount is increased to meet the environment-friendly standard emission requirement, so that the NH of the air preheater is formed 4 HSO 4 The sticking and blocking increases the resistance of the air preheater, and influences the normal output and safe operation of the unit.
In view of the above-mentioned drawbacks, the present inventors have actively studied and innovated to design a burner modification apparatus for solving the problem of low pressure of a large bellows of a low NOx burner, which is more industrially useful.
Disclosure of Invention
In order to solve the technical and safety problems, the invention aims to provide a method for ensuring the improvement of low NO X The burner reconstruction device solves the problem of low pressure of the large bellows of the low NOx burner by improving the pressure of the large bellows of the burner and the rigidity of the secondary air in the main burner area.
The invention provides a burner reconstruction device for solving the problem of low pressure of a large bellows of a low NOx burner, which comprises: the method comprises the steps of modifying the interiors of a secondary air box and a secondary air nozzle which are mutually communicated in each layer of a main burner and an SOFA air area, arranging at least one layer of secondary air box partition board in each secondary air box, arranging a mounting frame on the inlet side of the secondary air nozzle, connecting one end of the secondary air box partition board with the mounting frame, extending the other end of the secondary air box partition board into the secondary air box, hinging a baffle at the other end of the secondary air box partition board, connecting the baffle with a crank arranged outside the secondary air box, and adjusting the baffle to rotate clockwise and/or anticlockwise by 0-90 degrees through the crank;
at least one layer of nozzle baffle is also arranged in the secondary air nozzle, and the nozzle baffle extends from the air inlet to the air outlet.
Further, a layer of secondary air box partition plate is arranged in the secondary air box, the secondary air box partition plate is positioned in the middle of the secondary air box, and the total length of the secondary air box partition plate and a baffle plate hinged to the secondary air box partition plate is one half of the length of the secondary air box.
Further, a layer of nozzle baffle plate is arranged in the secondary air nozzle, and the nozzle baffle plate at the air inlet is arranged at a position corresponding to the secondary air box baffle plate.
Further, two layers of secondary air box partition plates are arranged in the secondary air box, the distances from each layer of secondary air box partition plate to the secondary air box shell are equal, and the baffle plates connected with each layer of secondary air box partition plate can rotate between 0 degrees and 90 degrees clockwise and/or anticlockwise.
Further, two layers of nozzle partition plates are arranged in the secondary air nozzle, and the nozzle partition plates at the air inlet are arranged at positions corresponding to the two secondary air box partition plates respectively.
Further, the crank is adjusted by manual adjustment, a drive motor or a linkage mechanism.
Further, when the baffle plate and the secondary air box partition plate are 90 degrees, a gap between the baffle plate and the air box wall of the secondary air box is 1-5 cm.
Further, the installation frame is provided with a joint positioning device, and the secondary air box partition plate is installed on the installation frame through the joint positioning device.
The invention provides a combustor transformation method for solving the problem of low pressure of a large bellows of a low NOx combustor, which comprises the following steps:
the operation load of the boiler is obtained,
when the boiler operation load is 75-100% THA working condition and the secondary air pressure can be maintained to be 0.7-2.0kPa, the SOFA air baffle has 50-100% opening, the nozzle air quantity does not need to be redistributed and adjusted, and the baffle is placed at a horizontal position;
when the boiler load is 60-75% THA, the pressure of the secondary air large bellows is lower than 0.5-1.0KPa, the opening of the SOFA air door is only 45-50%, and the baffle is adjusted so that the flow area in the adjusted bellows is reduced by 5-50% on the basis of the whole area of the bellows;
when the boiler load is 45-60% THA, the pressure of the secondary air large bellows is generally lower than 0.5KPa, the opening of the SOFA air door is smaller than 30% or even 0%, the discharge value of the hearth outlet is higher than the design value, the secondary air quantity is required to be redistributed, and the air flow area in the bellows is reduced to be one half of the original one.
By means of the scheme, the combustor transformation device for solving the problem that the pressure of the large bellows of the low NOx combustor is low has at least the following advantages:
1. the isolation baffle can be adjusted at any time according to the pressure change requirement of the large bellows, the pressure of the large bellows is improved, and the speed and rigidity of the secondary air of the nozzle are improved, so that the effect of enhancing combustion is achieved.
2. During low load, the flow area of the main burner area is reduced to one half of the original flow area through the isolation baffle, the pressure of the large bellows is effectively ensured to be in a reasonable range, the SOFA air quantity is increased, the oxidation atmosphere of the main combustion area is reduced, the NOx emission value of the outlet of a hearth can be effectively reduced, the ammonia spraying amount of a denitration system is effectively reduced, the probability of ammonia escape is reduced, and the blockage of the air preheater is effectively prevented.
3. The isolation baffle adjustment has stronger flexibility. The clockwise and anticlockwise adjustment can be selected according to the operation mode of the primary air burner.
The foregoing description is only an overview of the present invention, and is intended to provide a better understanding of the present invention, as it is embodied in the following description, with reference to the preferred embodiments of the present invention and the accompanying drawings.
Drawings
FIG. 1 is a schematic view showing the internal structure of an embodiment 1 of a burner modification apparatus for solving the problem of low pressure in a large bellows of a low NOx burner according to the present invention;
FIG. 2 is a schematic view showing the external structure of an embodiment 1 of the burner modification apparatus for solving the problem of low pressure in a large bellows of a low NOx burner according to the present invention;
FIG. 3 is a schematic view showing the internal structure of an embodiment 2 of the burner modification apparatus for solving the problem of low pressure in a large bellows of a low NOx burner according to the present invention;
FIG. 4 is a schematic view showing the internal structure of example 3 of the burner modification apparatus of the present invention for solving the problem of low pressure in the large bellows of the low NOx burner;
FIG. 5 is a schematic view of the crank adjustment baffle angle of the burner modification apparatus of the present invention addressing low pressure in the large bellows of a low NOx burner;
FIG. 6 is a schematic view of a crank adjustment baffle angle of a combustor retrofit device of the present invention addressing low pressure in a large windbox of a low NOx combustor;
FIG. 7 is a schematic view of a crank adjustment baffle angle of a combustor retrofit device of the present invention addressing low pressure in a large windbox of a low NOx combustor;
FIG. 8 is a view of baffle angle adjustment for a combustor retrofit device to address low NOx combustor windbox pressure;
FIG. 9 is a view of baffle angle adjustment for a combustor retrofit device to address the low pressure of a large windbox of a low NOx combustor in accordance with the present invention.
Detailed Description
The following describes in further detail the embodiments of the present invention with reference to the drawings and examples. The following examples are illustrative of the invention and are not intended to limit the scope of the invention.
Example 1
As shown in fig. 1 to 2, the present embodiment solves the problem of a burner modification apparatus of low pressure of a large windbox of a low NOx burner, comprising: the method comprises the steps that the interiors of a secondary air box 5 and a secondary air nozzle 4 which are mutually communicated in each layer of a main burner and an SOFA air area are modified, a layer of secondary air box partition board 2 is arranged in each secondary air box, a mounting frame is arranged on the inlet side of each secondary air nozzle, one end of each secondary air box partition board is connected with the mounting frame, the other end of each secondary air box partition board extends to the interior of the secondary air box, a baffle 1 is hinged to the other end of each secondary air box partition board, the baffle is connected with a crank 7 arranged outside the secondary air box, and the baffle is adjusted to rotate clockwise and/or anticlockwise by 0-90 degrees through the crank;
a layer of nozzle baffle 3 is also arranged in the secondary air nozzle, and the nozzle baffle extends from the air inlet to the air outlet.
In this embodiment, the overgrate air case in be equipped with one deck overgrate air case baffle, the overgrate air case baffle is located the middle part of overgrate air case, overgrate air case baffle and the baffle of articulated on the overgrate air case baffle total length is the half of overgrate air case length. A layer of nozzle baffle plate is arranged in the secondary air nozzle, and the nozzle baffle plate at the air inlet is arranged at a position corresponding to the secondary air box baffle plate.
In this embodiment, in order to facilitate the movement of the nozzle, the mounting frame is provided with a joint positioning device 6, and the secondary air box partition board is mounted on the mounting frame through the joint positioning device. In this embodiment, the crank is manually adjusted.
Example 2
As shown in fig. 3, the present embodiment solves the problem of the burner modification apparatus with low pressure of the large wind box of the low NOx burner, which is different from embodiment 1 in that the position of the secondary air partition is not set in the middle of the secondary air box but in a position above the middle.
Example 3
As shown in fig. 4, the present embodiment solves the problem of a burner modification apparatus with low pressure of a large windbox of a low NOx burner, comprising: the inside of each layer of secondary air box, the secondary air spout that communicate each other in main combustor and SOFA wind region is reformed transform, in each secondary air box in set up two-layer secondary air box baffle 11, 12, the entry side of secondary air spout is equipped with the mounting bracket, the one end of secondary air box baffle with the mounting bracket is connected, the other end of secondary air box baffle extends to inside the secondary air box, the other end of secondary air box baffle articulates respectively has baffle 21, 22, the baffle is connected with the crank that sets up at the secondary air box outside, through crank adjustment baffle 21 carries out clockwise and anticlockwise rotation between 0 to 90, through the rotation between 0 anticlockwise to 90 of crank adjustment baffle 22.
Two layers of nozzle baffle plates are also arranged in the secondary air nozzle, and the nozzle baffle plates extend from the air inlet to the air outlet. The nozzle baffle plate at the air inlet is arranged at positions corresponding to the two secondary air box baffle plates respectively.
In this embodiment, in order to facilitate the movement of the nozzle, the mounting frame is provided with a joint positioning device 6, and the secondary air box partition board is mounted on the mounting frame through the joint positioning device. In this embodiment, the crank is manually adjusted.
As shown in fig. 5 to 7, in the above embodiments, the crank adjusts the baffle angle.
In the above embodiments, in order to prevent the nozzle on the isolated half side from burning, a certain gap is reserved between the baffle and the bellows cavity. Even when the baffle is in a closed state, a certain cooling air quantity is still kept to pass through, so that the side nozzle is sufficiently cooled. When the baffle plate and the secondary air box partition plate are 90 degrees, the gap between the baffle plate and the air box wall of the secondary air box is 1-5 cm.
Example 4
The method for solving the problem of low pressure in the large bellows of the low NOx burner in this embodiment includes the device for solving the problem of low pressure in the large bellows of the low NOx burner in embodiment 1, and the method includes:
the operation load of the boiler is obtained,
when the boiler load is higher (generally 75-100% THA working condition), the SOFA air baffle has 50-100% opening degree when the secondary air pressure can be maintained at 0.7-2.0kPa, the NOx emission value of the hearth outlet is generally in a qualified range, the nozzle air quantity does not need to be redistributed and adjusted, and the internal separation baffle is placed in a horizontal position. At this time, the secondary air passes through the burner in an upper layer and a lower layer, and has no influence on the combustion of coal powder in the same operation mode as the original burner, as shown in fig. 1.
When the boiler load is 60-75% THA, the pressure of the secondary air large wind box is generally lower than 0.5-1.0KPa, the opening of the SOFA air door is only about 50%, if the pressure of the large wind box needs to be readjusted, the baffle plate can be adjusted to be kept at a certain angle from 0 degree to 90 degrees (horizontally-vertically), the flow area after adjustment is reduced by 0-50% on the basis of the original nozzle area, and through flexible adjustment of the area, the resistance is increased, the pressure of the large wind box and the secondary air speed of the nozzle are improved, and the combustion organization performance is enhanced, as shown in figure 8.
When the boiler load is 45-60% THA, the pressure of the secondary air large bellows is generally lower than 0.5KPa, the opening degree of the SOFA air door is smaller than 30% or even 0%, the discharge value of the hearth outlet is higher than the design value, and the secondary air volume needs to be redistributed at the moment, as shown in figure 9.
The position of the separation baffle plate is adjusted by 90 degrees clockwise or anticlockwise, the upper half part or the lower half part of the air box is isolated, the flow area in the air box is reduced to be one half of the original flow area, after the area is reduced, the resistance is increased, the pressure of the large air box and the secondary air speed of the nozzle are effectively improved, and the secondary air can be effectively organized and combusted.
The baffles are adjusted clockwise or counterclockwise (the adjustment baffles are located at the upper or lower portion) depending on the manner in which the primary air burners of adjacent layers are operated. If the lower primary air runs, the baffle plate needs to be adjusted by 90 degrees clockwise, so that the secondary air passes through a channel at the lower part of the isolation baffle plate; otherwise, the baffle plate is adjusted by 90 degrees anticlockwise, so that the secondary air passes through the upper channel of the isolation baffle plate.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, and it should be noted that it is possible for those skilled in the art to make several improvements and modifications without departing from the technical principle of the present invention, and these improvements and modifications should also be regarded as the protection scope of the present invention.
Claims (7)
1. A burner modification apparatus for addressing low pressure in a large bellows of a low NOx burner, comprising: the method comprises the steps of modifying the interiors of a secondary air box and a secondary air nozzle which are mutually communicated in each layer of a main burner and an SOFA air area, arranging at least one layer of secondary air box partition board in each secondary air box, arranging a mounting frame on the inlet side of the secondary air nozzle, connecting one end of the secondary air box partition board with the mounting frame, extending the other end of the secondary air box partition board into the secondary air box, hinging a baffle at the other end of the secondary air box partition board, connecting the baffle with a crank arranged outside the secondary air box, and adjusting the baffle to rotate clockwise and/or anticlockwise by 0-90 degrees through the crank;
at least one layer of nozzle baffle plate is also arranged in the secondary air nozzle, and the nozzle baffle plate extends from the air inlet to the air outlet;
the installation frame is provided with a joint positioning device, and the secondary air box partition board is installed on the installation frame through the joint positioning device;
the using process of the burner reconstruction device is as follows: acquiring the operation load of the boiler, when the operation load of the boiler is 75-100% of THA working condition and the secondary air pressure can be maintained at 0.7-2.0kPa, the SOFA air door has 50-100% of opening, the air quantity of the nozzle does not need to be redistributed and adjusted, and the baffle plate is arranged at the horizontal position;
when the boiler load is 60-75% THA, the pressure of the secondary air large bellows is lower than 0.5-1.0KPa, the opening of the SOFA air door is only 45-50%, and the baffle is adjusted so that the flow area in the adjusted bellows is reduced by 5-50% on the basis of the whole area of the bellows;
when the boiler load is 45-60% THA, the pressure of the secondary air large bellows is generally lower than 0.5KPa, the opening of the SOFA air door is smaller than 30% or even 0%, the discharge value of the hearth outlet is higher than the design value, the secondary air quantity is required to be redistributed, and the air flow area in the bellows is reduced to be one half of the original one.
2. The burner modification apparatus for solving the problem of low pressure of large wind box of low NOx burner according to claim 1, wherein a layer of secondary wind box partition plate is arranged in the secondary wind box, the secondary wind box partition plate is positioned in the middle of the secondary wind box, and the total length of the secondary wind box partition plate and the baffle plate hinged on the secondary wind box partition plate is one half of the length of the secondary wind box.
3. The burner modification apparatus for solving the problem of low pressure of large wind box of low NOx burner according to claim 2, wherein a layer of nozzle partition plate is arranged in the secondary air nozzle, and the nozzle partition plate at the air inlet is arranged at a position corresponding to the secondary air box partition plate.
4. The burner reconstruction device for solving the problem of low pressure of the large bellows of the low NOx burner according to claim 1, wherein two layers of secondary air box partition plates are arranged in the secondary air box, the distances from each layer of secondary air box partition plate to the secondary air box shell are equal, and the baffle plates connected with each layer of secondary air box partition plates can rotate between 0 degrees and 90 degrees clockwise and/or anticlockwise.
5. The burner modification apparatus for solving the problem of low pressure of large bellows of low NOx burner according to claim 4, wherein two layers of nozzle partition plates are arranged in the secondary air nozzle, and the nozzle partition plates at the air inlet are arranged at positions corresponding to the two secondary air chamber partition plates respectively.
6. The burner modification apparatus for solving the problem of low pressure in a large bellows of a low NOx burner according to claim 1, wherein the crank is adjusted by manual adjustment, a driving motor or a link mechanism.
7. The burner modification apparatus for solving the problem of low pressure in a large wind box of a low NOx burner according to any one of claims 1 to 6, wherein when the baffle plate is 90 ° to the secondary wind box partition plate, a gap between the baffle plate and a wind box wall of the secondary wind box is 1 to 5cm.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710761299.6A CN107504479B (en) | 2017-08-30 | 2017-08-30 | Combustor transformation device for solving low pressure of large bellows of low NOx combustor |
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| CN201710761299.6A CN107504479B (en) | 2017-08-30 | 2017-08-30 | Combustor transformation device for solving low pressure of large bellows of low NOx combustor |
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| CN107504479B true CN107504479B (en) | 2023-07-11 |
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| CN205481098U (en) * | 2016-03-22 | 2016-08-17 | 湖南大唐节能科技有限公司 | Overgrate air spout device that discharge area is adjustable |
| CN207350324U (en) * | 2017-08-30 | 2018-05-11 | 大唐东北电力试验研究所有限公司 | Solve the low burner reconstruction device of the big the pressure of bellows of low-NOx combustor |
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2017
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Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2097651C1 (en) * | 1994-01-26 | 1997-11-27 | Красноярский государственный технический университет | Boiler furnace |
| US5771823A (en) * | 1996-01-31 | 1998-06-30 | Aep Resources Service Company | Method and apparatus for reducing NOx emissions from a multiple-intertube pulverized-coal burner |
| JP2011052871A (en) * | 2009-08-31 | 2011-03-17 | Babcock Hitachi Kk | Combustion device |
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