CN218721639U - Secondary air box of supercritical W-flame boiler - Google Patents
Secondary air box of supercritical W-flame boiler Download PDFInfo
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- CN218721639U CN218721639U CN202222593440.5U CN202222593440U CN218721639U CN 218721639 U CN218721639 U CN 218721639U CN 202222593440 U CN202222593440 U CN 202222593440U CN 218721639 U CN218721639 U CN 218721639U
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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 utility model provides a supercritical W flame boiler secondary bellows belongs to boiler bellows field, include avris bellows I, middle part bellows, the avris bellows II that the wall independently set up respectively around boiler furnace, avris bellows I, middle part bellows and avris bellows II's entrance all is equipped with the air door baffle in order to adjust the amount of wind. The utility model discloses a secondary bellows structure can guarantee through the amount of wind of closing little avris bellows I and avris bellows II that the amount of wind that gets into the middle part bellows satisfies the demand of boiler burning under the condition that does not improve fan power when the boiler takes high load operation, and then avoids appearing the furnace middle part and flows burnt and high temperature corrosion scheduling problem to can reach energy saving and consumption reduction's effect.
Description
Technical Field
The utility model belongs to boiler bellows field, concretely relates to supercritical W flame boiler secondary bellows.
Background
At present, a thermal power generating set in China mainly takes a 600MW supercritical grade unit as a main unit, a boiler is a supercritical variable-pressure direct-current boiler, W-shaped flame combustion is adopted, 12 burners are respectively arranged on the front wall and the rear wall of a hearth of the boiler, each burner is provided with A, B, C, D, F graded air, and the air is supplied by large air boxes on the front wall and the rear wall.
In the process of implementing the invention, the inventor finds that the prior art has at least the following defects:
the air inlet mode of the front and rear wall large air boxes is air inlet on two sides, the air inlet structures on two sides operate under high load (more than 500 MW), the combustion oxygen deficiency in the middle of a hearth is obvious, coke flowing and high-temperature corrosion in the middle of a boiler are caused, and the safe operation of the boiler is seriously influenced.
SUMMERY OF THE UTILITY MODEL
Based on the above background problem, the utility model aims at providing a supercritical W flame boiler secondary bellows, do not independently set up avris bellows I, middle part bellows and avris bellows I in the punishment of wall around boiler furnace, when the boiler area high load operation, can guarantee to get into the amount of wind of middle part bellows through the amount of wind of closing down avris bellows I and avris bellows II and satisfy the demand that the boiler burnt, and then avoid appearing furnace middle part and flow burnt and high temperature corrosion scheduling problem.
In order to achieve the above object, the embodiment of the present invention provides a technical solution:
supercritical W flame boiler secondary bellows includes avris bellows I, middle part bellows, the avris bellows II that the wall independent setting respectively around boiler furnace, avris bellows I, middle part bellows and avris bellows II's entrance all is equipped with the air door baffle in order to adjust the amount of wind.
Furthermore, a side combustion unit I, a middle combustion unit and a side combustion unit II are arranged on the front wall and the rear wall of the boiler hearth;
the avris combustion unit I corresponds the intercommunication with avris bellows I, the middle part combustion unit corresponds the intercommunication with middle part bellows, avris combustion unit II corresponds the intercommunication with avris bellows II.
In one embodiment, the side combustion unit I, the middle combustion unit and the side combustion unit II each include four burners.
In one embodiment, the central combustion unit is in communication with the central windbox via a duct.
Furthermore, an adjusting baffle is arranged at the inlet of the air duct.
In one embodiment, the middle air box is communicated with two inlet channels, and the two inlet channels are provided with damper baffles.
In one embodiment, the side air box I, the middle air box and the side air box II are separated by arranging a partition board in the big air box.
Compared with the prior art, the embodiment of the utility model provides a have following effect at least:
1. the utility model provides a supercritical W flame boiler secondary bellows, before boiler furnace, back wall punishment do not independently sets up avris bellows I, middle part bellows and avris bellows II, avris bellows I, middle part bellows and avris bellows II's entrance all is equipped with the air door baffle, when the boiler takes high load operation, can be under the condition that does not improve fan power, the amount of wind that guarantees to get into middle part bellows through closing down avris bellows I and avris bellows II satisfies the demand that the boiler burnt, and then avoid appearing furnace middle part stream burnt and high temperature corrosion scheduling problem, and can reach energy saving and consumption reduction's effect.
2. The utility model discloses all only provide hierarchical air distribution for four combustors at avris bellows I, middle part bellows and avris bellows II, can guarantee the amount of wind demand of combustion unit.
3. The utility model discloses a middle part combustion unit passes through wind channel and middle part bellows intercommunication, and the entrance in wind channel is equipped with adjusting baffle, can adjust the regional secondary amount of wind of middle part combustion unit.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.
FIG. 1 is a plan view of a secondary air box of a supercritical W-flame boiler according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "center", "top", "bottom", "left", "right", "vertical", "horizontal", "inner", "outer", "front", "rear", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings of the specification, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
The utility model provides a furnace middle part burning oxygen deficiency that exists when supplying with in order to solve the big bellows of current boiler furnace's front and back wall is obvious, leads to the furnace middle part to flow burnt and high temperature corrosion scheduling problem, the embodiment of the utility model provides a supercritical W flame boiler secondary bellows, punishment do not independently set up avris bellows I, middle part bellows and avris bellows II in boiler furnace's preceding, back wall, avris bellows I, middle part bellows and avris bellows II's entrance all is equipped with the air door baffle, can close avris bellows I and avris bellows II's amount of wind when moving like this to guarantee that the amount of wind that gets into middle part bellows satisfies the demand of boiler burning, and then avoid appearing furnace middle part and flow burnt and high temperature corrosion scheduling problem.
Taking the front wall of a boiler furnace as an example, as shown in fig. 1, in this embodiment, a side air box I1, a middle air box 2 and a side air box II 3 are arranged at the front wall of the boiler, and the side air box I1, the middle air box 2 and the side air box II 3 are specifically formed by arranging two partition plates in an original front wall big air box for separation, that is, the original front wall big air box is separated into the independent side air box I1, the middle air box 2 and the side air box II 3 by the two partition plates.
The boiler comprises a boiler furnace, a boiler body, a side combustion unit I, a middle combustion unit and a side combustion unit II, wherein the side combustion unit I, the middle combustion unit and the side combustion unit II are arranged on the front wall of the boiler furnace; the avris combustion unit I corresponds the intercommunication with avris bellows I1, the middle part combustion unit corresponds the intercommunication with middle part bellows 2, avris combustion unit II corresponds the intercommunication with avris bellows II 3.
Specifically, the side combustion unit I comprises a combustor D3, E3, F3 and D4, the middle combustion unit comprises a combustor E4, F4, A3 and B3, the side combustion unit II comprises a combustor C3, A4, B4 and C4, so that the side bellows I1 controls the staged air distribution of the combustors D3, E3, F3 and D4, the middle bellows 2 controls the staged air distribution of the combustors E4, F4, A3 and B3, and the side bellows II 3 controls the staged air distribution of the combustors C3, A4, B4 and C4.
In order to realize the air volume adjustment, an air door baffle I101 is arranged at the side air box I1, an air door baffle II 301 is arranged at the side air box II 3, inlet channels are communicated with the left side and the right side of the middle air box 2, and air door baffles III 201 are arranged at the two inlet channels; the air volume is controlled by the air door baffle I101 in the side air box I1, the air volume is controlled by the air door baffle II 301 in the side air box II 3, and the air volume is controlled by the air door baffle III 201 arranged on two sides in the middle air box 2.
When the boiler is in high load, the total air quantity entering the side combustion unit I and the side combustion unit II can be reduced by closing the opening degrees of the air door baffle I101 and the air door baffle II 301, so that the air quantity required by the burners of the middle combustion units E4, F4, A3 and B3 can be met under the condition of not improving the power of the fan, energy can be saved, consumption can be reduced, and coke flowing and high-temperature corrosion caused by oxygen deficiency in the middle can be reduced.
In addition, this embodiment still sets up the middle part combustion unit pass through the wind channel with middle part bellows 2 intercommunication, the entrance in wind channel is equipped with adjusting baffle, can adjust the regional secondary air volume of middle part combustion unit. The adjusting baffle and the air sealing door baffle of this embodiment are the same in structure and are existing products, and this embodiment does not give further details to the structure thereof.
It should be noted that the arrangement of the rear wall of the boiler furnace is the same as that of the front wall, and therefore, the bellows structure of the rear wall of the boiler furnace is not described in this embodiment.
The specific flow of this embodiment in use is as follows:
1. keeping the original opening of an air distribution baffle A, B, C on the boiler arch unchanged, temporarily keeping the height of a despun blade unchanged, and closing the D baffle below the arch from about 25% of the current opening to about 20%.
2. Under the boiler cold state condition, start and draw, the forced draught blower operation, keep the air door baffle III that AB side front and back wall middle part combustion unit corresponds at first open entirely, adjust air door baffle I, air door baffle II to the avris after basically unanimous with the middle part wind pressure, the aperture of fixed each air door baffle.
3. And after the boiler is started and ignited, checking whether the pressure of the side air box I and the pressure of the side air box II of the front wall and the pressure of the rear wall are basically consistent with that of the middle air box, and otherwise, controlling the pressures to be basically consistent by adjusting the air door baffle.
4. In the starting process of the boiler, a portable flue gas analyzer is used for measuring NO at an inlet and an outlet of the SCR x Content, and comparing with DCS dial value according to boiler oxygen content and NO x The content is comprehensively considered, and the related air door baffle is adjusted to be at a moderate position.
5. Observing the NO at the outlet of the furnace chamber after the boiler is started normally x The temperature of the smoke and the like, if the temperature of the smoke at the outlet of the hearth rises more than that before the transformation, the D baffle is properly turned down, and the center of the flame is lowered; e.g. furnace outlet NO x Obviously increased before modification and meets the requirement of ultra-low emissionComparing the dosage of the SNCR urea solution under the condition, when the dosage of the urea solution is increased more, the monitoring of the differential pressure of the air preheater is enhanced, and when the differential pressure of the air preheater is abnormally increased, the adjustment is carried out in time.
6. After the boiler normally operates, under the working conditions of 50%, 75% and 100% loads, the temperature of the hearth is respectively tested and recorded in detail (at least 3 times of temperature measurement under each working condition), and the temperature is compared and analyzed with that before the transformation.
7. And after the boiler normally operates, taking the fly ash and the large slag under different working conditions for chemical analysis, comparing data before modification, and determining the next adjustment direction according to the change.
It should be noted that, for those skilled in the art, without departing from the inventive concept, several variations and modifications can be made, which all fall within the scope of the invention.
Claims (7)
1. Supercritical W flame boiler secondary bellows, its characterized in that includes avris bellows I, middle part bellows, avris bellows II that the wall set up independently respectively around boiler furnace, avris bellows I, middle part bellows and avris bellows II's entrance all is equipped with the air door baffle in order to adjust the amount of wind.
2. The supercritical W-flame boiler secondary air box according to claim 1, wherein a side combustion unit I, a middle combustion unit and a side combustion unit II are arranged at the front wall and the rear wall of the boiler furnace;
the lateral combustion unit I corresponds the intercommunication with lateral bellows I, the middle combustion unit corresponds the intercommunication with middle bellows, lateral combustion unit II corresponds the intercommunication with lateral bellows II.
3. The supercritical W-flame boiler secondary windbox according to claim 2 wherein each of the side combustion unit I, the middle combustion unit and the side combustion unit II comprises four burners.
4. The supercritical W-flame boiler secondary windbox of claim 2 wherein the middle combustion unit is in communication with the middle windbox through an air duct.
5. The supercritical W-flame boiler secondary air box according to claim 4, characterized in that an adjusting baffle is provided at the inlet of the air duct.
6. The supercritical W-flame boiler secondary windbox according to claim 1 wherein the middle windbox is connected to two inlet channels, and each of the two inlet channels is provided with a damper baffle.
7. The supercritical W flame boiler secondary windbox according to claim 1 wherein the side windbox I, middle windbox and side windbox II are separated by a partition plate provided in the large windbox.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222593440.5U CN218721639U (en) | 2022-09-29 | 2022-09-29 | Secondary air box of supercritical W-flame boiler |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222593440.5U CN218721639U (en) | 2022-09-29 | 2022-09-29 | Secondary air box of supercritical W-flame boiler |
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| Publication Number | Publication Date |
|---|---|
| CN218721639U true CN218721639U (en) | 2023-03-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202222593440.5U Active CN218721639U (en) | 2022-09-29 | 2022-09-29 | Secondary air box of supercritical W-flame boiler |
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| CN (1) | CN218721639U (en) |
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- 2022-09-29 CN CN202222593440.5U patent/CN218721639U/en active Active
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