CN106765239B - Boiler tail flue with built-in denitration flue gas bypass - Google Patents
Boiler tail flue with built-in denitration flue gas bypass Download PDFInfo
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- CN106765239B CN106765239B CN201710008639.8A CN201710008639A CN106765239B CN 106765239 B CN106765239 B CN 106765239B CN 201710008639 A CN201710008639 A CN 201710008639A CN 106765239 B CN106765239 B CN 106765239B
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- flue
- flue gas
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- gas bypass
- denitration
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/02—Arrangements of devices for treating smoke or fumes of purifiers, e.g. for removing noxious material
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2215/00—Preventing emissions
- F23J2215/10—Nitrogen; Compounds thereof
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/11001—Conducting systems with a gas flow bypass from main flue to an auxiliary flue
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chimneys And Flues (AREA)
Abstract
The invention discloses a boiler tail flue with a built-in denitration flue gas bypass, which belongs to the field of boiler denitration, wherein a plurality of heating surfaces are arranged in the boiler tail flue, at least one flue gas bypass flue with the width being the full width or part of the width of the boiler tail flue is also arranged in the boiler tail flue, each flue gas bypass flue is connected with one-stage or multi-stage heating surfaces in parallel, and the outlet of the flue gas bypass flue is integrated into the outlet of the boiler tail flue. The invention adopts the built-in denitration bypass flue integrated with the boiler tail flue, saves investment cost, reduces the floor area of the boiler, and ensures that the temperature of flue gas at a denitration inlet is more uniform.
Description
Technical Field
The invention belongs to the field of boiler denitration, and particularly relates to a tail flue of a boiler SCR denitration system.
Background
The large-scale power station boiler often participates in peak shaving, and the temperature of flue gas at an inlet of the SCR denitration device can be lower than full load when the SCR denitration device runs under low load. When the flue temperature is too low and cannot meet the denitration operation condition, the heat exchange quantity between the heating surface in the tail flue of the boiler and the flue gas can be reduced by arranging the flue gas bypass flue, so that the flue gas temperature of the denitration inlet is improved, and the denitration operation condition is met.
The existing flue gas bypass flue schemes all adopt external type, as shown in fig. 1: the heating surface is arranged in the tail flue of the boiler, the denitration device is arranged behind the tail flue of the boiler, and a catalyst required by denitration is arranged in the denitration device. A denitration inlet flue is also arranged between the boiler tail flue and the denitration device, and an ammonia spraying device is arranged in the denitration inlet flue. To reduce the deviation of the flue gas temperature and flow rate, a baffle is typically arranged in the denitration inlet flue. The flue gas bypass flue is led out from the front of the economizer or the low-temperature superheater and is connected to the front of the ammonia spraying device. And an adjusting baffle is further arranged in the flue gas bypass flue, and the baffle is opened and can adjust the bypass flue gas flow when the flue gas temperature needs to be improved, so that the flue gas in front of the ammonia spraying device reaches the required temperature.
With the continuous increase of renewable energy installation, higher requirements are put forward on the peak regulation depth of the thermal power generating unit, and the arrangement of a smoke bypass of a newly-built unit is almost necessarily selected. The existing external denitration flue gas bypass has the problems:
1) The bypass itself has a relatively small flow area limited by the external structure, and is limited by the wall-covering openings and the bypass flue to penetrate through the frame beams and trusses of the steel structure guide layer of the boiler, and cannot be designed too widely, so that a certain depth is required, and therefore, for a newly-built unit, the depth of the bypass flue can influence the column spacing of the boiler, so that the occupied area of the boiler is increased.
2) The position that the flue gas of denitration bypass flue was introduced into main flue is nearer to ammonia injection device and catalyst, because the bypass flue is not full width, can not guarantee to follow whole boiler width flue gas misce bene, probably causes the uneven temperature of catalyst entry flue gas. During operation, the deposition of ammonium bisulfate in a local low-smoke temperature area possibly occurs, and the safe and economic operation of the boiler is affected.
Disclosure of Invention
The invention aims at: the boiler tail flue with the built-in denitration flue gas bypass is provided, the built-in denitration bypass flue integrated with the boiler tail flue is adopted, the investment cost is saved, the floor area of the boiler is reduced, and the temperature of the denitration inlet flue gas is more uniform.
The aim of the invention is achieved by the following technical scheme:
a plurality of heating surfaces are arranged in the boiler tail flue, at least one flue gas bypass flue with the width being the full width or part of the width of the boiler tail flue is also arranged in the boiler tail flue, each flue gas bypass flue is connected with one-stage or multi-stage heating surfaces in parallel, an adjusting baffle is arranged at the inlet of the flue gas bypass flue, the outlet of the flue gas bypass flue is integrated into the outlet of the boiler tail flue, a flow guiding device is arranged on the boiler tail flue at the downstream of the outlet of the flue gas bypass flue, and the flow guiding device is positioned on one side wall of the boiler tail flue close to the denitration inlet flue and protrudes towards the inside of the boiler tail flue.
In the patent, the thought limitation that the bypass flue in the prior art is necessarily outside the main flue is jumped out, the built-in denitration bypass flue integrated with the boiler tail flue is adopted (the denitration bypass flue is the boiler tail flue in the prior art and the boiler tail flue in the prior art is not changed), a series of limitations and problems that the external (or combined parallel type) bypass flue is adopted in the prior art are avoided, the investment cost is saved, and the occupied area of the boiler is reduced; meanwhile, the bypass flue and the boiler tail flue are integrated, the flue gas bypass flue outlet is integrated into the boiler tail flue outlet, the bypass flue has the characteristics of low depth, high width and even full width, the mixing point of the bypass flue gas and the main flue gas and the long distance of the denitration agent injection device are achieved, the flue gas is more uniformly mixed, and the special diversion device further strengthens the uniformity.
Alternatively, the boiler tail flue consists of an upper cooling type wall-covering superheater and a lower heat-insulating flue, the heat-insulating flue is divided into two parallel flues by a partition wall, a plurality of heating surfaces are respectively arranged in the two parallel flues, and the tail ends of the two parallel flues are provided with flue gas adjusting baffles; one path of flue gas bypass flue is arranged on one side of the boiler tail flue close to the denitration inlet flue, and is arranged in parallel with the one-stage or multi-stage heating surface, and the width of the flue gas bypass flue is the full width of the boiler tail flue. In the scheme, the tail flue of the boiler is designed to be a double flue, and the single flue of the flue gas bypass flue is designed to be the full width.
Alternatively, the boiler tail flue consists of an upper cooling type wall-covering superheater and a lower heat-insulating flue, the heat-insulating flue is divided into two parallel flues by a partition wall, a plurality of heating surfaces are respectively arranged in the two parallel flues, and the tail ends of the two parallel flues are provided with flue gas adjusting baffles; the two flue gas bypass flues are respectively arranged on two opposite sides of the boiler tail flue close to and far from the denitration inlet flue and are connected with part of heating surfaces in parallel, and the width of the flue gas bypass flues is the full width of the boiler tail flue. In the scheme, the tail flue of the boiler is designed to be a double flue, and the flue gas bypass flue is designed to be the double flue in full width.
Alternatively, the flue gas bypass flue is formed by arranging a plurality of sub-flues at intervals. In the scheme, each flue gas bypass flue can be further designed in a split flue mode, and the design scheme is more flexible. That is, the patent can not only occupy the full width or partial width of the tail flue of the boiler by one flue gas bypass flue, but also can form a flue gas bypass flue by a plurality of separated flue gas channels which occupy the full width or partial width of the tail flue of the boiler.
Alternatively, the heating surfaces include a low temperature superheater, a low temperature reheater, and an economizer.
The foregoing inventive subject matter and various further alternatives thereof may be freely combined to form a plurality of alternatives, all of which are employable and claimed herein; and the invention can be freely combined between the (non-conflicting choices) choices and between the choices and other choices. Various combinations will be apparent to those skilled in the art from a review of the present disclosure, and are not intended to be exhaustive or all of the present disclosure.
The invention has the beneficial effects that:
1) The built-in flue gas bypass is arranged in a full furnace width mode, the depth is small, and the outlet of the bypass flue is communicated with the main flue, so that the pressure of the bypass flue is the same as the pressure of the main flue of the boiler, and a flue gas bypass space is directly reserved in the conventional boiler flue without adding additional parts such as rigid beams. Investment cost is saved.
2) The arrangement is not necessarily limited to beams and trusses in the steel structural guide layer frame of the boiler. For the newly-built unit, the distance between the tail flue of the boiler and the denitration device can be compressed, and the occupied area of the boiler is reduced.
3) The mixing point of the built-in bypass flue and the main flue is far away from the ammonia spraying device, the bypass flue gas outlet is integrated into the main flue, the bypass flue gas is distributed in the whole furnace width, and the flue gas temperature of the denitration inlet is more uniform.
Drawings
FIG. 1 is a schematic diagram of a prior art structure;
FIG. 2 is a schematic structural view of embodiment 1 of the present invention;
FIG. 3 is a schematic structural view of embodiment 2 of the present invention;
in the figure, a boiler 1, a boiler tail flue 2, a cooled wall-wrapped superheater 3, an adiabatic flue 4, a low-temperature superheater 5, a low-temperature reheater 6, an economizer 7, a partition wall 8, a flue gas adjusting baffle 9, a denitration device 20, a catalyst 21, a denitration inlet flue 22, an ammonia spraying device 23, a guide plate 24, a flue gas bypass flue 30 and an adjusting baffle 31.
Detailed Description
The following non-limiting examples illustrate the invention.
Example 1:
referring to fig. 2, a boiler tail flue 2 of a boiler 1 is generally composed of an upper cooling type wall-covering superheater 3 and a lower heat-insulating flue 4, heating surfaces such as a low-temperature superheater 5, a low-temperature reheater 6 and an economizer 7 are arranged in the heat-insulating flue 4, two parallel flues are separated by a partition wall 8, and flue gas adjusting baffles 9 are arranged at the tail ends of the two parallel flues. The denitrification device 20 is arranged behind the boiler tail flue 2, and a catalyst 21 required for SCR denitrification is arranged in the denitrification device 20. A denitration inlet flue 22 is also arranged between the boiler tail flue 2 and the denitration device 20, wherein an ammonia injection device 23 is arranged. To reduce the deviation of the flue gas temperature and flow rate, a baffle 24 is typically arranged in the denitration inlet flue 22. The flue gas bypass flue 30 and the boiler tail flue are integrally arranged, the width of the flue gas bypass flue 30 is the full width of the boiler tail flue 2, the flue gas bypass flue 30 is arranged on one side of the boiler tail flue 2 close to the denitration inlet flue 22, the inlet of the flue gas bypass flue is arranged in front of the economizer 7 or the low-temperature superheater 5, the outlet of the flue gas bypass flue is integrated into the outlet of the boiler tail flue 2, and outlet flue gas is directly mixed with flue gas after the economizer. An adjusting baffle 31 is arranged at the inlet of the flue gas bypass flue 30, and the baffle is opened and can adjust the bypass flue gas flow when the flue gas temperature needs to be increased. The flow guiding device 32 is arranged on the boiler tail flue 2 at the downstream of the outlet position of the flue gas bypass flue 30, and the flow guiding device 32 is positioned on one side wall of the boiler tail flue 2 close to the denitration inlet flue 22 and protrudes towards the inside of the boiler tail flue 2.
Example 2:
referring to fig. 3, this embodiment is substantially the same as embodiment 1, except that: the two flue gas bypass flues 30 are respectively positioned in the two parallel flues and are respectively positioned on two opposite sides of the boiler tail flue 2 close to and far from the denitration inlet flue 22, the inlet of the flue gas bypass flues is arranged in front of the slave economizer 7, and the outlet flue gas is directly mixed with the flue gas after the slave economizer 7.
Application example:
the patent is described by taking a 1000MW tail double-flue ultra-supercritical boiler and a bypass flue gas amount accounting for 18% of a rear flue as an example:
1. and (3) conventional design: the width of the furnace is about 34 meters, and the area of the bypass flue is about 15-20 m 2 The bypass smoke speed was 12m/s. Considering the requirements of bearing the rear wall and passing through the steel beam by the flue, the bypass flue is a double flue, and the upper part of the bypass flue has the size of about 9 meters multiplied by 1.5 meters; the uniformity of the denitration inlet flue gas temperature may reach more than 10 deg.c (highest flue gas temperature minus lowest flue gas temperature).
2. The patent scheme is as follows: the width of the furnace is about 34 meters, and the area of the bypass flue is about 15-20 m before the bypass flue is led from the back flue economizer 2 The bypass smoke speed was 12m/s. The built-in flue gas bypass is arranged according to the whole furnace width, and the depth is only 0.5 meter. The post-package wall bearing and the flue crossing steel beam do not need to be consideredThe problem is that the arrangement is simple. The external bypass is not needed, and the distance between the rear vertical shaft of the boiler and the denitration can be reduced by about 2 meters. The steel structure of the boiler is reduced by 200 tons, the cost is saved by 100 ten thousand yuan, the occupied area of the boiler is saved by 140 square meters, and the temperature uniformity of the denitration inlet smoke is improved to be within 5 ℃.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (4)
1. The utility model provides a boiler afterbody flue of built-in denitration flue gas bypass in area, has arranged a plurality of heated surfaces in the boiler afterbody flue, its characterized in that: the boiler tail flue is internally provided with at least one path of flue gas bypass flue with the width being the full width or part of the width of the boiler tail flue, each flue gas bypass flue is arranged in parallel with one-stage or multi-stage heating surfaces, an adjusting baffle is arranged at the inlet of the flue gas bypass flue, the outlet of the flue gas bypass flue is integrated into the outlet of the boiler tail flue, a denitration inlet flue is further arranged between the boiler tail flue and the denitration device, an ammonia spraying device is arranged in the denitration inlet flue, a flow guiding device is arranged on the boiler tail flue at the downstream of the outlet position of the flue gas bypass flue, and the flow guiding device is positioned on one side wall of the boiler tail flue close to the denitration inlet flue and protrudes towards the inside of the boiler tail flue.
2. The boiler afterbody flue with built-in denitration flue gas bypass as claimed in claim 1 wherein: the boiler tail flue consists of an upper cooling type wall-covering superheater and a lower heat-insulating flue, the heat-insulating flue is divided into two parallel flues by a partition wall, a plurality of heating surfaces are respectively arranged in the two parallel flues, and the tail ends of the two parallel flues are provided with flue gas adjusting baffles; one path of flue gas bypass flue is arranged on one side of the boiler tail flue close to the denitration inlet flue, and is arranged in parallel with the one-stage or multi-stage heating surface, and the width of the flue gas bypass flue is the full width of the boiler tail flue.
3. The boiler afterbody flue with built-in denitration flue gas bypass as claimed in claim 1 wherein: the boiler tail flue consists of an upper cooling type wall-covering superheater and a lower heat-insulating flue, the heat-insulating flue is divided into two parallel flues by a partition wall, a plurality of heating surfaces are respectively arranged in the two parallel flues, and the tail ends of the two parallel flues are provided with flue gas adjusting baffles; the two flue gas bypass flues are respectively arranged on two opposite sides of the boiler tail flue close to and far from the denitration inlet flue and are connected with part of heating surfaces in parallel, and the width of the flue gas bypass flues is the full width of the boiler tail flue.
4. The boiler afterbody flue with built-in denitration flue gas bypass as claimed in claim 1 wherein: the flue gas bypass flue is formed by arranging a plurality of sub-flues at intervals.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710008639.8A CN106765239B (en) | 2017-01-05 | 2017-01-05 | Boiler tail flue with built-in denitration flue gas bypass |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710008639.8A CN106765239B (en) | 2017-01-05 | 2017-01-05 | Boiler tail flue with built-in denitration flue gas bypass |
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| CN106765239A CN106765239A (en) | 2017-05-31 |
| CN106765239B true CN106765239B (en) | 2023-05-23 |
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| CN114110559B (en) * | 2021-11-12 | 2023-05-23 | 东方电气集团东方锅炉股份有限公司 | Flue gas baffle arrangement structure of secondary reheating boiler and reheat steam temperature control method |
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