CN110762515A - Boiler flue gas recirculation system and method capable of adjusting oxygen content of flue gas - Google Patents
Boiler flue gas recirculation system and method capable of adjusting oxygen content of flue gas Download PDFInfo
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- CN110762515A CN110762515A CN201911191815.1A CN201911191815A CN110762515A CN 110762515 A CN110762515 A CN 110762515A CN 201911191815 A CN201911191815 A CN 201911191815A CN 110762515 A CN110762515 A CN 110762515A
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- Prior art keywords
- flue gas
- oxygen content
- adjusting
- boiler
- recirculation
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- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 title claims abstract description 189
- 239000003546 flue gas Substances 0.000 title claims abstract description 189
- 239000001301 oxygen Substances 0.000 title claims abstract description 104
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 104
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 103
- 238000000034 method Methods 0.000 title claims description 13
- 230000001105 regulatory effect Effects 0.000 claims description 27
- 239000000779 smoke Substances 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 5
- 238000007599 discharging Methods 0.000 claims description 2
- MWUXSHHQAYIFBG-UHFFFAOYSA-N nitrogen oxide Inorganic materials O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 abstract description 18
- 238000005516 engineering process Methods 0.000 abstract description 9
- 238000005260 corrosion Methods 0.000 abstract description 5
- 230000007797 corrosion Effects 0.000 abstract description 5
- 230000035945 sensitivity Effects 0.000 abstract 1
- 238000002485 combustion reaction Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000006392 deoxygenation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
Images
Classifications
-
- 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
- F23B80/02—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel by means for returning flue gases to the combustion chamber or to the combustion zone
-
- 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
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
Abstract
The invention provides a boiler flue gas recirculation system capable of adjusting oxygen content of flue gas, which comprises a recirculation fan and a flue gas oxygen content adjusting system, wherein an outlet of a tail flue of a boiler body is connected with the flue gas oxygen content adjusting system for adjusting the flue gas content and the oxygen content of the recirculated flue gas through the recirculation fan; compared with the prior flue gas recirculation technology, the invention can further reduce the flue gas recirculation air quantity, reduce the adhesion and corrosion phenomena of the primary fan and reduce the original generation quantity of nitrogen oxides, and has the characteristics of accurate oxygen regulation, high sensitivity, simple system and the like.
Description
Technical Field
The invention relates to the field of low-nitrogen combustion modification of a thermal power plant, in particular to a boiler flue gas recirculation system and a boiler flue gas recirculation method capable of adjusting oxygen content of flue gas.
Background
Aiming at the ultra-low emission of nitrogen oxides, the generation of nitrogen oxides is reduced from the source and is the most important control means. The flue gas recirculation technology can reduce the oxygen content in the air, create a low-oxygen combustion process and reduce the original generation of nitrogen oxides, and is an important means for realizing stratified combustion. Meanwhile, the flue gas recirculation technology can also influence indexes such as the operating bed temperature of the boiler, the content of ash and slag combustible, the exhaust gas temperature and the like, creates a proper temperature window for the SNCR high-efficiency denitration, and is an important technology for realizing energy conservation, emission reduction and environmental protection unification.
The typical flue gas recirculation technology is to send a part of low-temperature flue gas at the tail of a boiler into a hearth through a recirculation fan, so that the heat distribution of the boiler is changed, the local combustion temperature is reduced, and the reaction atmosphere is adjusted. For pulverized coal furnaces, flue gas recirculation generally collects flue gas at the exit of the boiler economizer and introduces it into the furnace through a recirculation fan. The recirculation fan can only be used for a short time due to the high temperature of the recirculated flue gas, especially the high concentration of smoke dust; in the environmental protection field of circulating fluidized bed boilers, the flue gas recirculation mostly adopts a mode that flue gas is led out from an outlet of a draught fan and is sent to an inlet of an existing primary fan through a recirculation fan.
The flue gas recirculation technology has some problems in the middle of practical use, such as large amount of recirculated flue gas, high amount of tail flue gas oxygen, adhesion vibration of a primary fan and the like, and influences the high-efficiency and stable operation of the flue gas recirculation system. The air leakage of part of the boiler air preheater is serious, the oxygen content of the flue gas at the tail part of the boiler is 7-10% (even higher), the required recycled flue gas amount can reach more than 20% of the total flue gas amount, the burden of a recycling fan is heavy, the adhesion phenomenon of a primary fan is serious, the vibration of the primary fan is further aggravated, and the like. Therefore, how to reduce the amount of the recycled flue gas, or a technology capable of freely adjusting the oxygen content of the recycled flue gas becomes an important factor for the efficient operation of the flue gas recycling technology.
Disclosure of Invention
The invention aims to provide a boiler flue gas recirculation system and a boiler flue gas recirculation method capable of adjusting the oxygen content of flue gas, and solves the problems of overlarge recirculated flue gas amount in the prior art and the problems of aggravated vibration of a primary fan, dew formation and corrosion, incomplete combustion and the like caused by the overlarge flue gas amount.
In order to achieve the purpose, the invention adopts the technical scheme that:
the invention provides a boiler flue gas recirculation system capable of adjusting the oxygen content of flue gas, which comprises a recirculation fan and a flue gas oxygen content adjusting system, wherein an outlet of a tail flue of a boiler body is connected with the flue gas oxygen content adjusting system for adjusting the flue gas content and the oxygen content of the recirculated flue gas through the recirculation fan, and an outlet of the flue gas oxygen content adjusting system is connected with an air inlet of the boiler body.
Preferably, the flue gas oxygen content adjusting system comprises a first flue gas flow adjusting valve, a second flue gas flow adjusting valve and a deoxygenator, wherein a flue gas outlet of the recirculation fan is divided into two paths, one path is connected with the deoxygenator through the first flue gas flow adjusting valve, and the other path is connected with the second flue gas adjusting valve; and the smoke outlet of the deoxygenator and the outlet of the second smoke regulating valve are both connected with the air inlet of the boiler body.
Preferably, an induced draft fan is arranged between the outlet of the tail flue and the recirculation fan.
Preferably, a primary air fan is arranged at the outlet of the flue gas oxygen content adjusting system and the air inlet of the boiler body.
Preferably, a flue gas flowmeter and an oxygen sensor are sequentially arranged on a connecting pipeline between an outlet of the flue gas oxygen amount regulating system and an air inlet of the boiler body.
A boiler flue gas recirculation method capable of adjusting oxygen content in flue gas is based on the boiler flue gas recirculation system capable of adjusting oxygen content in flue gas, and comprises the following steps:
discharging the flue gas of the boiler body to a recirculation fan through a tail flue; the recycled flue gas is discharged into the flue gas oxygen amount adjusting system through the recycling fan, the flue gas amount and the oxygen amount of the recycled flue gas are adjusted through the flue gas oxygen amount adjusting system, and then the recycled flue gas is discharged into an air inlet of the boiler body.
Preferably, the specific method for adjusting the flue gas quantity and the oxygen quantity of the recirculated flue gas by the flue gas oxygen quantity adjusting system is as follows:
utilize the parallelly connected structure of main road and bypass, adjust the flow and the oxygen content of flue gas according to the technological requirement, wherein, oxygen content control range: the lower limit is zero, and the upper limit is the oxygen content of the flue gas at the inlet of the recirculation fan.
Preferably, the flow rate and oxygen amount of the recirculated flue gas are controlled by a first flue gas flow regulating valve and a second flue gas flow regulating valve, wherein:
when the first flue gas flow regulating valve is opened and the second flue gas flow regulating valve is fully closed, the flue gas enters the first flue gas flow regulating valve and is treated by the deoxygenator, so that the oxygen content of the recirculated flue gas is zero;
when the first adjusting smoke flow adjusting valve is closed and the second smoke flow adjusting valve is opened, the oxygen content of the recirculated smoke is equal to the oxygen content of the inlet of the recirculation fan.
Compared with the prior art, the invention has the beneficial effects that:
according to the boiler flue gas recirculation system and the method capable of adjusting the oxygen content of the flue gas, provided by the invention, the flow and the oxygen content of the recirculated flue gas are adjusted by the flue gas oxygen content adjusting system, the adjusted recirculated flue gas is discharged into the air inlet of the boiler body, the total amount of dust in the flue gas is reduced due to the reduction of the amount of the recirculated flue gas, and the problems of dust adhesion, condensation and corrosion of a primary fan are relieved; the adjustable characteristic of the oxygen content of the recirculated flue gas enables the boiler air distribution to be more flexible, the proportion of primary air and secondary air can be adjusted according to the load of the boiler, and the purposes of optimizing operation and improving boiler efficiency are achieved.
Furthermore, oxygen in the flue gas is further removed through the deoxygenator, the using amount of the recycled flue gas is reduced, and the burden of a recycling fan is lightened.
Drawings
Fig. 1 is a schematic diagram of the structure of the system involved in the invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
As shown in fig. 1, the boiler flue gas recirculation system capable of adjusting the oxygen content of flue gas provided by the invention comprises a boiler body 1, a tail flue 2, an induced draft fan 3, a recirculation fan 4, a flue gas flowmeter 8, an oxygen sensor 9, a primary fan 10 and a flue gas oxygen content adjusting system 11, wherein an outlet of the tail flue 2 on the boiler body 1 is connected with an inlet of the induced draft fan 3, an outlet of the induced draft fan 3 is divided into two paths, one path is connected with external wet desulphurization equipment, and the other path is connected with the flue gas oxygen content adjusting system 11 through the recirculation fan 4; the outlet of the flue gas oxygen content adjusting system 11 is connected with the air inlet of the boiler body 1 through a primary air fan 10.
The flue gas oxygen content adjusting system 11 comprises a first flue gas flow adjusting valve 5, a second flue gas flow adjusting valve 6 and a deoxygenator 7, wherein a flue gas outlet of the recirculation fan 4 is divided into two paths, one path is connected with the deoxygenator 7 through the first flue gas flow adjusting valve 5, and the other path is connected with the second flue gas adjusting valve 6; and the smoke outlet of the deoxygenator 7 and the outlet of the second smoke regulating valve 6 are both connected with the air inlet of the boiler body 1.
And a flue gas flowmeter 8 and an oxygen sensor 9 are sequentially arranged on a connecting pipeline between an outlet of the flue gas oxygen amount regulating system 11 and the primary air fan 10.
A boiler flue gas recirculation method capable of adjusting oxygen content of flue gas comprises the following steps:
the flow and oxygen content of the recirculated flue gas are controlled by a first flue gas flow regulating valve 5 and a second flue gas flow regulating valve 6;
when the first flue gas flow regulating valve 5 is opened and the second flue gas flow regulating valve 6 is fully closed, the oxygen content of the recirculated flue gas is zero (minimum oxygen content);
when the first flue gas flow regulating valve 5 is fully closed and the second flue gas flow regulating valve 6 is opened, the oxygen content of the recirculated flue gas is equal to the oxygen content (maximum oxygen content) of the outlet of the induced draft fan 3;
the target oxygen amount value between the minimum oxygen amount and the maximum oxygen amount can be obtained by properly adjusting the opening degrees of the first adjusting flue gas flow regulating valve 5 and the second flue gas flow regulating valve 6.
The oxygen content of the flue gas passing through the deoxygenator 7 is less than 200ppm, and the oxygen content can be considered as zero basically.
The working principle of the invention is as follows:
the invention provides a technical scheme of flue gas recirculation capable of adjusting the oxygen content of flue gas, wherein a flue gas oxygen content adjusting system 11 is arranged at an outlet of a recirculation fan 4, and a flue gas flowmeter 8 and an oxygen sensor 9 are arranged at an outlet of the flue gas oxygen content adjusting system 11. The flue gas oxygen content adjusting system 11 utilizes a structure that a main path and a bypass are connected in parallel, the flow and the oxygen content of flue gas can be adjusted according to needs, the lower limit of an oxygen content adjusting range is zero, and the upper limit is the flue gas oxygen content of an outlet of a draught fan.
The core point of the invention is that the flue gas oxygen regulating system 11 is used for regulating the flue gas quantity and oxygen quantity of the recirculated flue gas to match with corresponding boiler load, bed temperature and other operation parameters, thereby achieving the purposes of optimizing operation and improving boiler efficiency. The flue gas flow regulating valve uses a corrosion-resistant electric regulating valve, the deoxygenator uses copper or aluminum as an oxidized object, the deoxygenation effect is good, and the oxygen content is less than 200 ppm.
The invention provides a flue gas recirculation method and a flue gas recirculation system capable of adjusting oxygen content of flue gas, which can adjust the flow and oxygen content of the recirculated flue gas of a boiler according to requirements in a certain range according to boiler load and operation parameters, reduce the amount of the recirculated flue gas, reduce bed temperature, reduce vibration and corrosion of a primary fan and reduce the original emission of nitrogen oxides, and are an innovative technology for realizing low-nitrogen combustion of the boiler and ultralow emission of the nitrogen oxides.
Claims (8)
1. The utility model provides a can adjust boiler flue gas recirculation system of flue gas oxygen volume, a serial communication port, including recirculation fan (4) and flue gas oxygen volume governing system (11), wherein, the export of the afterbody flue (2) of boiler body (1) is connected with flue gas oxygen volume governing system (11) that are used for adjusting the flue gas volume and the oxygen volume of recirculated flue gas through recirculation fan (4), the export of flue gas oxygen volume governing system (11) and the air intake connection of boiler body (1).
2. The boiler flue gas recirculation system capable of adjusting the oxygen content in the flue gas as claimed in claim 1, wherein the flue gas oxygen content adjusting system (11) comprises a first flue gas flow adjusting valve (5), a second flue gas flow adjusting valve (6) and a deoxygenator (7), wherein the flue gas outlet of the recirculation fan (4) is divided into two paths, one path is connected with the deoxygenator (7) through the first flue gas flow adjusting valve (5), and the other path is connected with the second flue gas adjusting valve (6); the smoke outlet of the deoxygenator (7) and the outlet of the second smoke regulating valve (6) are both connected with the air inlet of the boiler body (1).
3. The boiler flue gas recirculation system capable of adjusting the oxygen content of the flue gas as claimed in claim 1, characterized in that an induced draft fan (3) is arranged between the outlet of the tail flue (2) and the recirculation fan (4).
4. The boiler flue gas recirculation system capable of adjusting the oxygen content in the flue gas as claimed in claim 1, wherein a primary fan (10) is arranged at the outlet of the flue gas oxygen content adjusting system (11) and the air inlet of the boiler body (1).
5. The boiler flue gas recirculation system capable of adjusting the oxygen content in the flue gas as claimed in claim 1, wherein a flue gas flowmeter (8) and an oxygen sensor (9) are sequentially arranged on a connecting pipeline between the outlet of the flue gas oxygen content adjusting system (11) and the air inlet of the boiler body (1).
6. A boiler flue gas recirculation method capable of adjusting oxygen content of flue gas, which is characterized in that the boiler flue gas recirculation system capable of adjusting oxygen content of flue gas based on any one of claims 1-5 comprises the following steps:
discharging the flue gas of the boiler body (1) to a recirculation fan (4) through a tail flue (2); the recycled flue gas is discharged into a flue gas oxygen amount adjusting system (11) through a recycling fan (4), the flue gas amount and the oxygen amount of the recycled flue gas are adjusted through the flue gas oxygen amount adjusting system (11), and then the recycled flue gas is discharged into an air inlet of a boiler body (1).
7. The boiler flue gas recirculation method capable of adjusting the oxygen content of the flue gas according to the claim 6, characterized in that the flue gas oxygen content adjusting system (11) adjusts the flue gas content and the oxygen content of the recirculated flue gas by the following specific methods:
utilize the parallelly connected structure of main road and bypass, adjust the flow and the oxygen content of flue gas according to the technological requirement, wherein, oxygen content control range: the lower limit is zero, and the upper limit is the oxygen content of the flue gas at the inlet of the recirculation fan (4).
8. The boiler flue gas recirculation method capable of adjusting oxygen content of flue gas according to claim 6, characterized in that the flow and oxygen content of recirculated flue gas are controlled by a first adjusting flue gas flow regulating valve (5) and a second flue gas flow regulating valve (6), wherein:
when the first flue gas flow regulating valve (5) is opened and the second flue gas flow regulating valve (6) is closed completely, the flue gas enters the first flue gas flow regulating valve (5) and is treated by the deoxygenator (7), so that the oxygen content of the recirculated flue gas is zero;
when the first adjusting flue gas flow adjusting valve (5) is closed completely and the second flue gas flow adjusting valve (6) is opened, the oxygen content of the recirculated flue gas is equal to the oxygen content of the inlet of the recirculation fan (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191815.1A CN110762515A (en) | 2019-11-28 | 2019-11-28 | Boiler flue gas recirculation system and method capable of adjusting oxygen content of flue gas |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191815.1A CN110762515A (en) | 2019-11-28 | 2019-11-28 | Boiler flue gas recirculation system and method capable of adjusting oxygen content of flue gas |
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| Publication Number | Publication Date |
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| CN110762515A true CN110762515A (en) | 2020-02-07 |
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| CN201911191815.1A Pending CN110762515A (en) | 2019-11-28 | 2019-11-28 | Boiler flue gas recirculation system and method capable of adjusting oxygen content of flue gas |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130340658A1 (en) * | 2012-06-22 | 2013-12-26 | Sheng Zhun Enterprise Co., Ltd. | Exhaust gas recycling control system of combustion device |
| US20160053996A1 (en) * | 2014-08-21 | 2016-02-25 | Alstom Technology Ltd | COMBUSTION AND FLUE GAS TREATMENT SYSTEM AND SOx REMOVAL UNIT |
| CN206176351U (en) * | 2016-11-16 | 2017-05-17 | 捷旗马克能源科技(江苏)有限公司 | Reduce flue gas circulation system that nitrogen oxide generated |
| CN206222294U (en) * | 2016-11-29 | 2017-06-06 | 冯伟忠 | A kind of flue gas recycling system |
| CN211694849U (en) * | 2019-11-28 | 2020-10-16 | 中国华能集团清洁能源技术研究院有限公司 | Boiler flue gas recirculation system capable of adjusting oxygen content of flue gas |
-
2019
- 2019-11-28 CN CN201911191815.1A patent/CN110762515A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130340658A1 (en) * | 2012-06-22 | 2013-12-26 | Sheng Zhun Enterprise Co., Ltd. | Exhaust gas recycling control system of combustion device |
| US20160053996A1 (en) * | 2014-08-21 | 2016-02-25 | Alstom Technology Ltd | COMBUSTION AND FLUE GAS TREATMENT SYSTEM AND SOx REMOVAL UNIT |
| CN206176351U (en) * | 2016-11-16 | 2017-05-17 | 捷旗马克能源科技(江苏)有限公司 | Reduce flue gas circulation system that nitrogen oxide generated |
| CN206222294U (en) * | 2016-11-29 | 2017-06-06 | 冯伟忠 | A kind of flue gas recycling system |
| CN211694849U (en) * | 2019-11-28 | 2020-10-16 | 中国华能集团清洁能源技术研究院有限公司 | Boiler flue gas recirculation system capable of adjusting oxygen content of flue gas |
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