CN113048463A - System for main reheat steam temperature deviation is adjusted to four corners tangential boiler - Google Patents
System for main reheat steam temperature deviation is adjusted to four corners tangential boiler Download PDFInfo
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- CN113048463A CN113048463A CN202110523222.1A CN202110523222A CN113048463A CN 113048463 A CN113048463 A CN 113048463A CN 202110523222 A CN202110523222 A CN 202110523222A CN 113048463 A CN113048463 A CN 113048463A
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- boiler
- furnace
- steam temperature
- reheat steam
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/12—Controlling superheat temperature by attemperating the superheated steam, e.g. by injected water sprays
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22G—SUPERHEATING OF STEAM
- F22G5/00—Controlling superheat temperature
- F22G5/02—Applications of combustion-control devices, e.g. tangential-firing burners, tilting burners
Abstract
The invention discloses a system for adjusting main reheat steam temperature deviation of a four-corner tangential boiler, which comprises a rear left electric adjusting valve, a rear right electric adjusting valve, a left burnout air box and a right burnout air box, wherein the rear left electric adjusting valve is arranged on the rear of a boiler; the outlet of the left burnout air box is communicated with the left spout of the rear of the boiler through the left electric adjusting valve of the rear of the boiler, the outlet of the right burnout air box is communicated with the right spout of the rear of the boiler through the right electric adjusting valve of the rear of the boiler, and the system can effectively solve the problem of main reheat steam temperature deviation.
Description
Technical Field
The invention belongs to the field of pulverized coal boilers of power stations, and relates to a system for adjusting main reheat steam temperature deviation of a four-corner tangential boiler.
Background
The tangential firing at four corners is characterized in that the whole hearth is a combustion unit, the airflow at four corners interacts with each other to form clockwise or anticlockwise rotating ascending airflow in the hearth, and certain residual rotation still exists in the airflow at the outlet of the hearth. The residual rotation can increase the uneven distribution degree of the flue gas flow velocity and the flue gas temperature of the hearth outlet and the horizontal flue.
To anticlockwise rotation circle-cutting boiler, the residual rotating airflow at the right side of the boiler is consistent with the airflow direction at the inlet of the horizontal flue at the right side of the flue, and the left side of the boiler is just opposite, so that the flue gas flow rate at the right side of the flue is higher than that at the left side of the flue, the flue gas flow rate is higher, the flue gas stroke is shorter, the heat release quantity is reduced when each kilogram of flue gas passes through the heat transfer channel, the flue gas outlet temperature is also higher, namely, the flue gas temperature of the area with the high flue gas flow rate of the horizontal flue is also higher, the temperature of the right side flue gas after heat exchange is also higher than. And for the clockwise rotation tangential boiler, the smoke temperature deviation of high left and low right is formed. If the deviation of the smoke temperature is large, the deviation of the main reheat steam temperature or the overtemperature of the local metal wall temperature of the high-temperature convection heating surface is inevitably caused.
The problem is also a typical problem which puzzles boiler workers in a four-corner tangential boiler, and at present, no effective method exists, so that the design of a system capable of flexibly adjusting the temperature deviation of main reheat steam is particularly important.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a system for adjusting the temperature deviation of main reheat steam of a four-corner tangential boiler, which can effectively solve the problem of the temperature deviation of the main reheat steam.
In order to achieve the aim, the system for adjusting the main reheat steam temperature deviation of the four-corner tangential boiler comprises a furnace rear left electric adjusting valve, a furnace rear right electric adjusting valve, a left burnout air box and a right burnout air box;
the outlet of the left burnout air box is communicated with a left spout behind the boiler through an electric adjusting valve on the left side behind the boiler, and the outlet of the right burnout air box is communicated with a right spout behind the boiler through an electric adjusting valve on the right side behind the boiler.
The furnace is characterized by further comprising a controller, wherein the controller is connected with the control end of the furnace rear left electric adjusting valve and the control end of the furnace rear right electric adjusting valve.
The rear left nozzle is arranged above the SOFA tuyere at the top left side of the upper rear of the boiler.
The rear right nozzle is arranged above the SOFA tuyere at the top layer of the upper rear right side of the boiler.
The distance between the rear left nozzle and the front of the SOFA tuyere at the top layer on the rear left side of the furnace is 0.2 m.
The distance between the spout at the right side behind the furnace and the SOFA tuyere at the top layer at the right side behind the furnace is 0.2 m.
The electric actuator of the left spout at the back of the furnace is connected with the controller.
The electric actuating mechanism for the rear right side spout of the furnace is used for driving the rear right side spout of the furnace to swing left and right in the horizontal plane, and is connected with the controller.
The invention has the following beneficial effects:
when the system for adjusting the main reheat steam temperature deviation of the four-corner tangential boiler is in specific operation, when the right-side main steam temperature or the reheat steam temperature is higher than the left-side main steam temperature or the reheat steam temperature and the deviation is more than 5 ℃, the opening of the electric adjusting valve on the right side behind the boiler is gradually increased, the electric adjusting valve on the left side behind the boiler is kept completely closed, so that the air intake on the right side of the boiler is gradually increased, the right-side main steam temperature or the reheat steam temperature is further reduced, and the purpose of balancing the left-side main steam temperature or the reheat steam temperature of the boiler is achieved; when the left side main steam temperature or the reheat steam temperature is higher than the right side main steam temperature or the reheat steam temperature and the deviation exceeds 5 ℃, the opening degree of the electric regulating valve on the left side behind the boiler is gradually increased, the electric regulating valve on the right side behind the boiler is kept fully closed, so that the air intake on the left side of the boiler is gradually increased, the left side main steam temperature or the reheat steam temperature is reduced, the purpose of balancing the left side main steam temperature or the reheat steam temperature of the boiler is achieved, and the problem of deviation of the main reheat steam temperature is effectively solved.
Further, an electric actuating mechanism of the rear right nozzle of the furnace is adjusted to enable the rear right nozzle of the furnace to be 25 degrees leftwards or rightwards in the horizontal direction0The furnace is swung within the range to control the jet flow rotating direction and the foot point position of a nozzle on the right side behind the furnace, reduce the smoke temperature at the outlet of a hearth on the right side and homogenize the smoke temperature distribution, and the problem of over-temperature of the local metal wall of a high-temperature convection heating surface is solved or relieved.
Further, an electric actuator of the left side spout at the back of the furnace is adjusted to enable the left side spout at the back of the furnace to be 25 degrees leftwards or rightwards in the horizontal direction0The furnace is swung within the range to control the jet flow rotating direction and the foot point position of a nozzle on the left side behind the furnace, so that the smoke temperature of a hearth outlet on the left side is reduced, the smoke temperature distribution is homogenized, and the problem that the temperature of a local metal wall of a high-temperature convection heating surface is over-temperature is solved or relieved.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Wherein, fig. 2 is a schematic view of the installation positions of the furnace rear left side spout 1 and the furnace rear right side spout 2.
Wherein, 1 is a furnace rear left side spout, 2 is a furnace rear right side spout, 3 is a furnace rear left side spout electric actuator, 4 is a furnace rear right side spout electric actuator, 5 is a furnace rear left side electric regulating valve, 6 is a furnace rear right side electric regulating valve, 7 is a left side burn-out air box, 8 is a right side burn-out air box, 9 is a furnace rear left side top layer SOFA air port, and 10 is a furnace rear right side top layer SOFA air port.
Detailed Description
In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments, and are not intended to limit the scope of the present disclosure. Moreover, in the following description, descriptions of well-known structures and techniques are omitted so as to not unnecessarily obscure the concepts of the present disclosure. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
There is shown in the drawings a schematic block diagram of a disclosed embodiment in accordance with the invention. The figures are not drawn to scale, wherein certain details are exaggerated and possibly omitted for clarity of presentation. The shapes of various regions, layers and their relative sizes and positional relationships shown in the drawings are merely exemplary, and deviations may occur in practice due to manufacturing tolerances or technical limitations, and a person skilled in the art may additionally design regions/layers having different shapes, sizes, relative positions, according to actual needs.
Referring to fig. 1 and 2, the system for adjusting the main reheat steam temperature deviation of the four-corner tangential boiler comprises a controller, a left nozzle 1 behind the boiler, a right nozzle 2 behind the boiler, an electric actuator 3 of the left nozzle 1 behind the boiler, an electric actuator 4 of the right nozzle 2 behind the boiler, an electric adjusting valve 5 on the left side behind the boiler, an electric adjusting valve 6 on the right side behind the boiler, a left burnout air box 7 and a right burnout air box 8.
Furnace back left side spout 1 sets up in the top of furnace back left side top layer SOFA wind gap 9 on the boiler, furnace back right side spout 2 sets up in the top of furnace back right side top layer SOFA wind gap 10 on the boiler, and the distance between furnace back left side spout 1 and the furnace back left side top layer SOFA wind gap 9 is 0.2m, the distance between furnace back right side spout 2 and the furnace back right side top layer SOFA wind gap 10 is 0.2m, can play the effect of further burning out to the buggy, on the other hand, this position is nearer apart from the furnace export, the regulating action to furnace export smoke temperature is stronger, main reheat steam temperature deviation of regulation that can be better.
The outlet of the left burnout air box 7 is communicated with the left spout 1 after the furnace through the left electric adjusting valve 5 after the furnace, the outlet of the right burnout air box 8 is communicated with the right spout 2 after the furnace through the right electric adjusting valve 6 after the furnace, and the controller is connected with the left electric adjusting valve 5 after the furnace, the right electric adjusting valve 6 after the furnace, the electric actuating mechanism 3 of the left spout 1 after the furnace and the electric actuating mechanism 4 of the right spout 2 after the furnace.
The specific working process of the invention is as follows:
when the temperature of the right main steam is equal to or higher thanWhen the hot steam temperature is higher than the main steam temperature or the reheated steam temperature on the left side and the deviation is more than 5 ℃, the opening degree of the electric adjusting valve 6 on the right side behind the boiler is gradually increased, the electric adjusting valve 5 on the left side behind the boiler is kept fully closed, so that the air inlet quantity on the right side of the boiler is gradually increased, and meanwhile, the electric actuating mechanism 4 of the spout on the right side behind the boiler is adjusted, so that the spout 2 on the right side behind the boiler is 25 degrees leftwards or rightwards in the horizontal direction0The range swings to control the jet flow rotating direction and the foot point position of the nozzle 2 at the right side behind the boiler, reduce the smoke temperature at the outlet of the hearth at the right side and homogenize the smoke temperature distribution so as to reduce the main steam temperature or the reheat steam temperature at the right side and achieve the purpose of balancing the main steam temperature or the reheat steam temperature at the left side and the right side of the boiler.
When the left side main steam temperature or the reheat steam temperature is higher than the right side main steam temperature or the reheat steam temperature and the deviation exceeds 5 ℃, the opening degree of the left side electric regulating valve 5 behind the boiler is gradually increased, the right side electric regulating valve 6 behind the boiler is kept fully closed, the air inlet amount on the left side of the boiler is gradually increased, and meanwhile, the left side spout electric actuating mechanism 3 behind the boiler is regulated, so that the left side spout 1 behind the boiler is 25 degrees centigrade to the left or right in the horizontal direction0The range swings to control the jet flow rotating direction and the foot point position of the left nozzle 1 at the back of the boiler, then the smoke temperature at the outlet of the left hearth is reduced and the smoke temperature distribution is homogenized to reduce the main steam temperature or the reheat steam temperature at the left side and achieve the purpose of balancing the main steam temperature or the reheat steam temperature at the left side and the right side of the boiler.
Claims (8)
1. A system for adjusting main reheat steam temperature deviation of a four-corner tangential boiler is characterized by comprising a furnace rear left side electric adjusting valve (5), a furnace rear right side electric adjusting valve (6), a left side burnout air box (7) and a right side burnout air box (8);
the outlet of the left burnout air box (7) is communicated with a left spout (1) on the rear of the boiler through an electric adjusting valve (5) on the left side of the rear of the boiler, and the outlet of the right burnout air box (8) is communicated with a right spout (2) on the rear of the boiler through an electric adjusting valve (6) on the right side of the rear of the boiler.
2. The system for adjusting the main reheat steam temperature deviation of a quadrangle tangential boiler as set forth in claim 1, further comprising a controller, wherein the controller is connected to the control end of the left electric adjusting valve (5) at the rear of the boiler and the control end of the right electric adjusting valve (6) at the rear of the boiler.
3. The system for adjusting the main reheat steam temperature deviation of a quadrangle tangential boiler as set forth in claim 1, wherein the left nozzle (1) is disposed above the SOFA tuyere (9) of the left top layer of the upper left side of the upper furnace of the boiler.
4. The system for adjusting main reheat steam temperature deviation of a quadrangle tangential boiler as set forth in claim 1, wherein the rear right nozzle (2) is disposed above the top SOFA tuyere (10) on the upper rear right side of the boiler.
5. The system for adjusting main reheat steam temperature deviation of a quadrangle tangential boiler as set forth in claim 3, wherein the distance between the rear left nozzle (1) and the front top SOFA tuyere (9) is 0.2 m.
6. The system for adjusting main reheat steam temperature deviation of a quadrangle tangential boiler as set forth in claim 4, wherein the distance between the right side nozzle (2) at the rear of the furnace and the SOFA tuyere (10) at the right side of the rear of the furnace is 0.2 m.
7. The system for adjusting the main reheat steam temperature deviation of a quadrangle tangential boiler as claimed in claim 2, further comprising a furnace rear left side spout electric actuator (3) for driving the furnace rear left side spout (1) to swing left and right in a horizontal plane, wherein the furnace rear left side spout electric actuator (3) is connected with the controller.
8. The system for adjusting the main reheat steam temperature deviation of a quadrangle tangential boiler as set forth in claim 2, further comprising a furnace rear right side spout electric actuator (4) for driving the furnace rear right side spout (2) to swing left and right in a horizontal plane, wherein the furnace rear right side spout electric actuator (4) is connected with the controller.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110523222.1A CN113048463A (en) | 2021-05-13 | 2021-05-13 | System for main reheat steam temperature deviation is adjusted to four corners tangential boiler |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110523222.1A CN113048463A (en) | 2021-05-13 | 2021-05-13 | System for main reheat steam temperature deviation is adjusted to four corners tangential boiler |
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| CN113048463A true CN113048463A (en) | 2021-06-29 |
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| CN202110523222.1A Pending CN113048463A (en) | 2021-05-13 | 2021-05-13 | System for main reheat steam temperature deviation is adjusted to four corners tangential boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060847A (en) * | 2021-10-29 | 2022-02-18 | 华北电力科学研究院有限责任公司 | Control method and device for flue gas temperature deviation of tower furnace hearth of fan mill powder system |
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| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| US20140216364A1 (en) * | 2013-02-05 | 2014-08-07 | Alstom Technology Ltd | Method and apparatus for reheat steam temperature control of oxy-fired boilers |
| CN104197314A (en) * | 2014-08-05 | 2014-12-10 | 广东省粤电集团有限公司珠海发电厂 | Four corner tangential boiler combustion control method |
| CN105485667A (en) * | 2015-06-18 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Pulverized coal reheating boiler |
| CN106678783A (en) * | 2017-02-24 | 2017-05-17 | 国电科学技术研究院 | Combustion optimization system and adjustment method for preventing water wall high-temperature corrosion |
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2021
- 2021-05-13 CN CN202110523222.1A patent/CN113048463A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20140216364A1 (en) * | 2013-02-05 | 2014-08-07 | Alstom Technology Ltd | Method and apparatus for reheat steam temperature control of oxy-fired boilers |
| CN103216821A (en) * | 2013-04-27 | 2013-07-24 | 东方电气集团东方锅炉股份有限公司 | Multi-stage stratified combustion system and method for primary air and secondary air of boiler |
| CN104197314A (en) * | 2014-08-05 | 2014-12-10 | 广东省粤电集团有限公司珠海发电厂 | Four corner tangential boiler combustion control method |
| CN105485667A (en) * | 2015-06-18 | 2016-04-13 | 无锡华光锅炉股份有限公司 | Pulverized coal reheating boiler |
| CN106678783A (en) * | 2017-02-24 | 2017-05-17 | 国电科学技术研究院 | Combustion optimization system and adjustment method for preventing water wall high-temperature corrosion |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114060847A (en) * | 2021-10-29 | 2022-02-18 | 华北电力科学研究院有限责任公司 | Control method and device for flue gas temperature deviation of tower furnace hearth of fan mill powder system |
| CN114060847B (en) * | 2021-10-29 | 2023-09-19 | 华北电力科学研究院有限责任公司 | Control method and device for smoke temperature deviation of tower furnace hearth of fan mill pulverizing system |
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Application publication date: 20210629 |
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