CN112460576A - Boiler smoke and air system suitable for deep peak regulation and peak regulation method - Google Patents
Boiler smoke and air system suitable for deep peak regulation and peak regulation method Download PDFInfo
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- CN112460576A CN112460576A CN202011326251.0A CN202011326251A CN112460576A CN 112460576 A CN112460576 A CN 112460576A CN 202011326251 A CN202011326251 A CN 202011326251A CN 112460576 A CN112460576 A CN 112460576A
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- flue gas
- boiler
- outlet
- air
- gas recirculation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
- F22D1/16—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways
- F22D1/20—Feed-water heaters, i.e. economisers or like preheaters with water tubes arranged otherwise than in the boiler furnace, fire tubes, or flue ways and directly connected to boilers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The invention relates to the field of operation optimization of power station boilers, in particular to a boiler smoke and air system suitable for deep peak shaving and a peak shaving method. The system comprises a connecting channel arranged between an outlet air flue of a boiler blower and an inlet flue of a draught fan, and a flue gas recirculation loop arranged between an outlet flue of an economizer and a SOFA air box; the connecting channel is close to the outlet of the air feeder and the inlet of the induced draft fan; the flue gas recirculation loop is close to the outlet of the economizer; the flue gas recirculation loop comprises a flue gas recirculation fan and a flue gas regulating valve; the inlet of the flue gas recirculation fan is connected with the outlet flue of the economizer, and the outlet of the flue gas recirculation fan is connected with the SOFA nozzle; the outlet of the smoke recirculation fan is also connected with the main combustion nozzle of the boiler through a pipeline. The system of the invention is simple to change, completely solves the problems of high concentration of NOx at the SCR inlet, low temperature of reheated steam of the boiler and the like, and effectively improves the operation characteristic of deep peak shaving of the boiler.
Description
Technical Field
The invention relates to the field of operation optimization of power station boilers, in particular to a boiler smoke and air system suitable for deep peak shaving and a peak shaving method.
Background
The deep peak regulation is an operation mode that the output of each power plant is reduced and a generator set exceeds a basic peak regulation range to regulate the peak due to the large influence of the load peak-valley difference of the power grid; the load range of the deep peak regulation exceeds the lowest stable combustion load of the power plant boiler, for example, the deep peak regulation amplitude is about 30% ECR.
In order to improve the capability of a power grid for receiving more clean energy, the coal-fired power plant is required to improve the capability of deep peak shaving, the deep peak shaving brings a series of problems to a coal-fired power generating set, and under the deep peak shaving, a boiler blower exceeds a normal adjustment range, so that the running oxygen amount is very high, and the problems of high SCR inlet NOx concentration, large smoke discharge heat loss, low reheating steam temperature of a boiler and the like are brought.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the boiler flue gas and air system suitable for deep peak regulation and the peak regulation method, the system is simple to change, the problems of high concentration of SCR inlet NOx, low temperature of boiler reheated steam and the like are completely solved, and the operating characteristic of the deep peak regulation of the boiler is effectively improved.
The invention is realized by the following technical scheme:
a boiler smoke and air system suitable for deep peak regulation comprises a connecting channel arranged between an outlet air duct of a boiler blower and an inlet flue of a draught fan, and a smoke recirculation loop arranged between an outlet flue of an economizer and a SOFA air box;
the connecting channel is close to the outlet of the air feeder and the inlet of the induced draft fan; the flue gas recirculation loop is close to the outlet of the coal economizer.
Further, the flue gas recirculation loop comprises a flue gas recirculation fan and a flue gas regulating valve; the inlet of the flue gas recirculation fan is connected with the outlet flue of the economizer, and the outlet of the flue gas recirculation fan is connected with the SOFA nozzle.
Furthermore, the outlet of the flue gas recirculation fan is connected with a main combustion nozzle of the boiler through a pipeline.
Furthermore, the connecting channel is an air supply adjusting bypass.
Furthermore, the connecting channel is also provided with an air damper and an air quantity metering device.
Furthermore, an air quantity metering device is arranged on the flue gas recirculation loop.
A peak shaving method of a boiler smoke and air system suitable for deep peak shaving comprises the following steps,
when the boiler enters deep peak shaving operation, a connecting channel from an outlet of a blower to an inlet of an induced draft fan is opened, part of air quantity is directly guided into the inlet of the induced draft fan and does not pass through a hearth, and air quantity participating in combustion is reduced;
when the sufficient flue gas amount of a boiler furnace and a heating surface flue needs to be ensured, a flue gas recirculation loop from an economizer outlet flue to a SOFA air box is started, the recirculated flue gas directly enters the SOFA air box and then enters the furnace through a SOFA nozzle, and the combustion of a main burner area is not interfered.
Furthermore, the air quantity which does not enter the hearth is measured by an air quantity measuring device and is adjusted by using a damper.
Compared with the prior art, the invention has the following beneficial technical effects:
the system of the invention is improved on the existing conventional air-smoke system, and the air quantity entering the boiler furnace is adjusted according to the requirement by adding the connecting channel from the outlet of the air feeder to the inlet of the induced draft fan, thereby effectively reducing the air quantity participating in combustion; meanwhile, a flue gas recirculation loop from an outlet flue of the economizer to the SOFA air box is added, so that the necessary flue gas flow is maintained, the reheating steam temperature is favorably improved, and the sufficient flue gas amount of a boiler hearth and a heating surface flue is ensured; the newly added system is simple in composition, the running performance of the boiler air-smoke system in a deep peak shaving state is effectively improved, and the problems of high concentration of NOx at an SCR inlet, large heat loss of discharged smoke, low temperature of reheated steam of a boiler and the like can be solved.
Drawings
Fig. 1 is a schematic structural diagram of the system according to the embodiment of the present invention.
In the figure: 1-a blower, 2-a draught fan, 3-a flue gas recirculation fan, 4-a flue gas adjusting valve, 5-an air supply adjusting bypass, 7-an economizer, 8-a SOFA nozzle and 9-a main combustion nozzle of a boiler.
Detailed Description
The present invention will now be described in further detail with reference to specific examples, which are intended to be illustrative, but not limiting, of the invention.
The invention relates to a boiler flue gas and air system suitable for deep peak shaving, which comprises a connecting channel and a flue gas recirculation loop, wherein the connecting channel is connected and arranged on a boiler hearth, and the flue gas recirculation loop is connected with the connecting channel; the flue gas recirculation loop comprises a flue gas recirculation fan 3, a flue gas regulating valve 4 and an air flow metering device; the connecting channel comprises an air supply adjusting bypass 5 and an air quantity metering device;
the air supply adjusting bypass 5 is arranged on a pipeline between an outlet flue of the boiler blower 1 and an inlet flue of the induced draft fan 2;
the flue gas regulating valve 4 and the flue gas recirculation fan 3 are sequentially arranged on a pipeline between an outlet flue of the economizer 7 and the SOFA air box;
in the preferred embodiment, a flue gas recirculation device is added in the SCR inlet flue and is connected with a main combustion nozzle 9 of the boiler. The connecting channel between the air duct at the outlet of the air feeder 1 and the air duct at the outlet of the induced draft fan 2 is provided with an air quantity metering device and an air regulating door; and an air quantity metering device is also arranged on a flue gas recirculation loop between the outlet flue of the economizer 7 and the SOFA air box.
In practical application, a connecting channel from an outlet air duct of a blower 1 to an inlet air duct of an induced draft fan 2 is additionally arranged on an existing coal-fired boiler flue gas system (comprising a boiler flue, an air duct and a hearth), and a flue gas recirculation loop from an outlet air duct of an economizer 7 to a SOFA air box is additionally arranged.
On the basis of the system, the invention also provides a peak shaving method of the boiler smoke and air system suitable for deep peak shaving, which comprises the following steps,
when the boiler enters deep peak shaving operation, a connecting channel from an outlet of the air feeder 1 to an inlet of the induced draft fan 2 is opened, partial air quantity is directly introduced to the inlet of the induced draft fan 2 and does not pass through a hearth, so that the air quantity participating in combustion is reduced, the air quantity which does not enter the hearth can be measured by an air quantity measuring device, and a damper is used for adjusting;
when the sufficient flue gas amount of a boiler furnace and a heating surface flue needs to be ensured, a flue gas recirculation loop from an outlet flue of an economizer 7 to a SOFA air box is started, the recirculated flue gas directly enters the SOFA air box and then enters the furnace through a SOFA nozzle 8, the combustion in a main burner area is not interfered, the function of maintaining the necessary flue gas amount is achieved, and the reheating steam temperature is favorably improved.
Claims (8)
1. The utility model provides a boiler flue gas wind system that is adapted to degree of depth peak regulation which characterized in that: the system comprises a connecting channel arranged between an outlet air duct of a boiler blower (1) and an inlet flue of a draught fan (2), and a flue gas recirculation loop arranged between an outlet flue of an economizer (7) and a SOFA air box;
the connecting channel is close to the outlet of the air feeder (1) and the inlet of the induced draft fan (2); the flue gas recirculation loop is close to the outlet of the coal economizer (7).
2. The boiler flue gas system adapted for deep peak shaving according to claim 1, wherein: the flue gas recirculation loop comprises a flue gas recirculation fan (3) and a flue gas regulating valve (4); the inlet of the flue gas recirculation fan (3) is connected with the outlet flue of the economizer (7), and the outlet of the flue gas recirculation fan (3) is connected with the SOFA nozzle (8).
3. The boiler flue gas system adapted for deep peak shaving according to claim 2, wherein: the outlet of the flue gas recirculation fan (3) is also connected with a main combustion nozzle (9) of the boiler through a pipeline.
4. The boiler flue gas system adapted for deep peak shaving according to claim 1, wherein: the connecting channel is an air supply adjusting bypass (5).
5. The boiler flue gas system adapted for deep peak shaving according to claim 1, wherein: the connecting passage is also provided with an air adjusting door and an air quantity metering device.
6. The boiler flue gas system adapted for deep peak shaving according to claim 1, wherein: and the flue gas recirculation loop is also provided with an air quantity metering device.
7. A method of peak shaving for a boiler flue gas system adapted to deep peak shaving, characterized in that the system according to any one of claims 1-6 comprises,
when the boiler enters deep peak shaving operation, a connecting channel from an outlet of the air feeder (1) to an inlet of the induced draft fan (2) is opened, part of air quantity is directly guided into the inlet of the induced draft fan (2) and does not pass through a hearth, and air quantity participating in combustion is reduced;
when the sufficient flue gas amount of a boiler furnace and a heating surface flue needs to be ensured, a flue gas recirculation loop from an outlet flue of an economizer (7) to a SOFA air box is started, and the recirculated flue gas directly enters the SOFA air box and then enters the furnace through a SOFA nozzle (8), so that the combustion of a main burner area is not interfered.
8. The method of claim 7, wherein the amount of air not entering the furnace is measured by an air volume measuring device and adjusted by using a damper.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011326251.0A CN112460576A (en) | 2020-11-23 | 2020-11-23 | Boiler smoke and air system suitable for deep peak regulation and peak regulation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011326251.0A CN112460576A (en) | 2020-11-23 | 2020-11-23 | Boiler smoke and air system suitable for deep peak regulation and peak regulation method |
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| CN112460576A true CN112460576A (en) | 2021-03-09 |
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Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPS60162115A (en) * | 1984-02-03 | 1985-08-23 | Hitachi Zosen Corp | Incinerator exhaust gas system |
| JPS63104636A (en) * | 1986-10-21 | 1988-05-10 | Ishikawajima Harima Heavy Ind Co Ltd | NOx reduction method during fluidized bed boiler load fluctuation |
| JPS63223413A (en) * | 1987-03-11 | 1988-09-16 | Mitsubishi Heavy Ind Ltd | Forced draft type boiler |
| JPH0250003A (en) * | 1988-08-08 | 1990-02-20 | Babcock Hitachi Kk | Boiler device |
| JPH035613A (en) * | 1989-06-02 | 1991-01-11 | Mitsubishi Heavy Ind Ltd | Incinerator |
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| JP2011137574A (en) * | 2009-12-28 | 2011-07-14 | Ihi Corp | Boiler ventilation pressure control device and method of operating the same |
| CN104791772A (en) * | 2015-05-07 | 2015-07-22 | 无锡宇澄环境工程设备有限公司 | Low-nitrogen combustion stokerfeed boiler with two-stage smoke recirculation function |
| CN106969346A (en) * | 2017-04-01 | 2017-07-21 | 山东英电环保科技有限公司 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
| CN206831475U (en) * | 2017-04-01 | 2018-01-02 | 山东英电环保科技有限公司 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
| CN108087867A (en) * | 2018-01-11 | 2018-05-29 | 西安热工研究院有限公司 | It is a kind of to be used to balance underload nitrogen oxides and the low nitrogen burning system and method for carbonated drink parameter |
| CN108592015A (en) * | 2018-06-15 | 2018-09-28 | 清华大学 | A kind of boiler smoke recirculating system and its method |
| CN110260299A (en) * | 2019-05-29 | 2019-09-20 | 华中科技大学 | Supercritical carbon dioxide coal-burning boiler and its multi-stage flue gas method for recycling |
| RU2709591C1 (en) * | 2018-08-22 | 2019-12-18 | Ооо "Тепломех" | Power plant with active boiler of high-temperature fluidised bed with improved characteristics of furnace processes |
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2020
- 2020-11-23 CN CN202011326251.0A patent/CN112460576A/en active Pending
Patent Citations (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60162115A (en) * | 1984-02-03 | 1985-08-23 | Hitachi Zosen Corp | Incinerator exhaust gas system |
| JPS63104636A (en) * | 1986-10-21 | 1988-05-10 | Ishikawajima Harima Heavy Ind Co Ltd | NOx reduction method during fluidized bed boiler load fluctuation |
| JPS63223413A (en) * | 1987-03-11 | 1988-09-16 | Mitsubishi Heavy Ind Ltd | Forced draft type boiler |
| JPH0250003A (en) * | 1988-08-08 | 1990-02-20 | Babcock Hitachi Kk | Boiler device |
| JPH035613A (en) * | 1989-06-02 | 1991-01-11 | Mitsubishi Heavy Ind Ltd | Incinerator |
| JP2001033032A (en) * | 1999-07-21 | 2001-02-09 | Mitsubishi Heavy Ind Ltd | Method and system for exhausting burnt gas |
| JP2003130325A (en) * | 2001-10-24 | 2003-05-08 | Hitachi Ltd | Waste incineration system and exhaust gas treatment method |
| US20090013871A1 (en) * | 2007-07-11 | 2009-01-15 | Arthur Darde | Process and apparatus for the separation of a gaseous mixture |
| JP2011137574A (en) * | 2009-12-28 | 2011-07-14 | Ihi Corp | Boiler ventilation pressure control device and method of operating the same |
| CN104791772A (en) * | 2015-05-07 | 2015-07-22 | 无锡宇澄环境工程设备有限公司 | Low-nitrogen combustion stokerfeed boiler with two-stage smoke recirculation function |
| CN106969346A (en) * | 2017-04-01 | 2017-07-21 | 山东英电环保科技有限公司 | A kind of denitrating flue gas humidity control system based on flue gas recirculating technique |
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| CN108087867A (en) * | 2018-01-11 | 2018-05-29 | 西安热工研究院有限公司 | It is a kind of to be used to balance underload nitrogen oxides and the low nitrogen burning system and method for carbonated drink parameter |
| CN108592015A (en) * | 2018-06-15 | 2018-09-28 | 清华大学 | A kind of boiler smoke recirculating system and its method |
| RU2709591C1 (en) * | 2018-08-22 | 2019-12-18 | Ооо "Тепломех" | Power plant with active boiler of high-temperature fluidised bed with improved characteristics of furnace processes |
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Application publication date: 20210309 |
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