CN114659099A - Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler - Google Patents
Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler Download PDFInfo
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- CN114659099A CN114659099A CN202210417474.0A CN202210417474A CN114659099A CN 114659099 A CN114659099 A CN 114659099A CN 202210417474 A CN202210417474 A CN 202210417474A CN 114659099 A CN114659099 A CN 114659099A
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- 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
- F23C9/003—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for pulverulent fuel
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- 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
- F23C5/00—Disposition of burners with respect to the combustion chamber or to one another; Mounting of burners in combustion apparatus
- F23C5/08—Disposition of burners
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- 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
- F23C7/00—Combustion apparatus characterised by arrangements for air supply
- F23C7/002—Combustion apparatus characterised by arrangements for air supply the air being submitted to a rotary or spinning motion
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- 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
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- 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
- F23C9/08—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for reducing temperature in combustion chamber, e.g. for protecting walls of combustion chamber
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Abstract
The invention discloses a flue gas circulating system for improving combustion characteristics and thermal characteristics of a pulverized coal fired boiler, which comprises a plurality of circulating flue gas leading-out ports arranged on a flue at the outlet of a hearth of the boiler, wherein the circulating flue gas leading-out ports are connected with a circulating flue gas leading-out main pipe through a circulating flue gas leading-out pipeline, the circulating flue gas leading-out main pipe is connected with a circulating flue gas leading-in main pipe, the circulating flue gas leading-in main pipe is connected with a circulating flue gas leading-in pipeline, and the circulating flue gas leading-in pipeline is connected with the hearth. The flue gas in the flue is introduced into the hearth through the circulating flue gas outlet, so that the flue gas circulation is realized, and the problems of slag bonding and over-temperature of the heating surface of the pulverized coal boiler of the power station, high-temperature corrosion of a water cooling wall, burning loss of a burner, incapability of reaching a designed steam temperature, high concentration of nitrogen oxides at the outlet of the hearth and the like can be solved or relieved.
Description
Technical Field
The invention belongs to the technical field of pulverized coal boilers in power stations, and particularly relates to a flue gas circulating system capable of remarkably improving combustion characteristics (including nitrogen oxide emission and slagging characteristics) and thermal characteristics of a pulverized coal boiler.
Background
The large coal-fired thermal power generating set is still the main unit in China at present, the pulverized coal boiler is used as the core main equipment of the thermal power generating set, and the operation safety and reliability of the pulverized coal boiler have important influence on the whole generating set and even a power grid. However, under the background of new trends of deep peak regulation, flexible operation, ultra-clean emission modification, deviation of actual coal quality for combustion from a design value and the like of a thermal power generating set, the problems of high parameter, slag bonding and over-temperature of a heating surface of a large-capacity power station pulverized coal boiler, high-temperature corrosion of a water-cooled wall, burner burning loss, failure in steam temperature to reach the design value, high concentration of nitrogen oxides at a hearth outlet, ash blockage of an air preheater and the like generally exist. The problems are related to inherent combustion and thermal characteristics of the coal-fired boiler, and are more obvious due to factors such as pollutant control requirements, flexible operation conditions, poor coal quality and the like under new conditions.
Under the working condition of high-load operation of a boiler, the problems of slag bonding and high-temperature corrosion of a water-cooled wall of the hearth and overtemperature of the wall of the water-cooled wall are aggravated due to high flame temperature of the hearth, and the problems are more prominent when low-ash high-melting-point high-sulfur coal is used for boiler combustion or a separated type over-fired air low-nitrogen combustion technology is adopted; when the boiler is used for burning high-alkali and low-ash fusion point coal (such as eastern Junggar coal and the like), the risk that slag clings to the high-temperature heating surface of the boiler, particularly the heating surface of a high-temperature reheater, and a circulation flue is blocked is greatly increased. When the boiler is in a low-load working condition, in order to ensure steam parameters, the running oxygen amount is higher, the excess air coefficient is usually larger than 1.2, but the phenomenon that the steam parameters are lower is still common. The operation oxygen quantity is increased, the air quantity proportion of the separated type over-fire air is reduced, and as a result, oxygen deficiency or even oxygen-deficient combustion cannot be formed in a burner area, so that the effect of the separated type over-fire air technology is obviously weakened, and the concentration of nitrogen oxides at the outlet of a hearth is increased along with the reduction of the load of a boiler. Meanwhile, the heat loss of the exhaust smoke of the boiler is increased by the excessive air, and the thermal efficiency of the boiler is reduced. Secondly, the local heat load distribution is uneven due to the small number of the operating burners under the medium and low loads, so that the smoke temperature deviation of the outlet of the hearth is large, and the local over-temperature of the pipe wall of a part of high-temperature heating surface is caused.
The pulverized coal fired boiler adopting the separated over-fire air technology generally has the problem of burning loss of the cyclone burner, and related researches consider that the burning loss of the cyclone burner mainly occurs during standby of the pulverized coal fired boiler, and the main reasons are that the pressure of a secondary air box is insufficient due to the fact that more secondary air is shunted by the separated over-fire air, and the internal and external secondary air cooling air volume and the central air cooling air volume of the standby burner are small.
The reasons for the problems are related and restricted, and the problems are difficult to be solved or alleviated simultaneously by the configuration of the smoke and air system and the environment-friendly emission requirement of the pulverized coal boiler of the power station at present, so that the smoke and air system of the pulverized coal boiler needs to be improved.
Disclosure of Invention
Aiming at the problems in the prior art, the invention aims to provide a flue gas circulating system for improving the combustion characteristic and the thermal characteristic of a pulverized coal boiler.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the utility model provides an improve pulverized coal boiler combustion characteristic, thermal characteristics's flue gas circulation system, includes a plurality of circulation flue gas outlet that set up on the furnace outlet flue of boiler, and circulation flue gas outlet is drawn forth the pipeline and is drawn forth female pipe with circulation flue gas and link to each other, and circulation flue gas is drawn forth female pipe and is linked to each other with circulation flue gas and introduce female pipe, and circulation flue gas is introduced female pipe and is linked to each other with circulation flue gas introduction pipeline, and circulation flue gas introduction pipeline links to each other with furnace.
The invention is further improved in that the circulating flue gas outlet main pipe is connected with the inlet of the furnace smoke circulating fan, and the outlet of the furnace smoke circulating fan is connected with the circulating flue gas inlet main pipe.
The invention is further improved in that the circulating flue gas outlet comprises one or more of a first circulating flue gas outlet, a second circulating flue gas outlet, a third circulating flue gas outlet, a fourth circulating flue gas outlet and a fifth circulating flue gas outlet.
The invention has the further improvement that a screen superheater, a steering smoke chamber, an air preheater and an induced draft fan are arranged on a flue at the outlet of a hearth of the boiler;
the first flue gas outlet is connected with an outlet flue of the induced draft fan; the second flue gas outlet is connected with an inlet of the induced draft fan, the third flue gas outlet is connected with an outlet flue of the air preheater, the fourth flue gas outlet is connected with an outlet flue of the economizer, and the fifth flue gas outlet is connected with the steering smoke chamber.
The invention is further improved in that a plurality of introducing ports are formed in the bottom of the hearth, and the introducing ports comprise one or more of a first circulating flue gas introducing port arranged at the bottom of the hearth, a second circulating flue gas introducing port arranged in a burner area and a third circulating flue gas introducing port arranged at the bottom of the screen superheater.
The invention has the further improvement that a leading-out flue gas damper baffle is arranged on the circulating flue gas leading-out main pipe.
The invention has the further improvement that the circulating flue gas introducing main pipe is provided with a introduced flue gas damper baffle and a flue gas flow measuring device.
The invention is further improved in that a smoke temperature measuring device and a smoke pressure measuring device are arranged on the circulating smoke introducing main pipe.
Compared with the prior art, the invention has the following beneficial effects:
on the basis of a raw coal powder boiler flue gas system, a plurality of circulating flue gas leading-out ports are arranged on a hearth outlet flue of a boiler, the circulating flue gas leading-out ports are connected with a circulating flue gas leading-out main pipe through a circulating flue gas leading-out pipeline, the circulating flue gas leading-out main pipe is connected with a circulating flue gas leading-in main pipe, the circulating flue gas leading-in main pipe is connected with a circulating flue gas leading-in pipeline, and the circulating flue gas leading-in pipeline is connected with a hearth. The flue gas in the flue is introduced into the hearth through the circulating flue gas outlet, so that the flue gas circulation is realized, and the problems of slag bonding and over-temperature of the heating surface of the pulverized coal boiler of the power station, high-temperature corrosion of a water cooling wall, burning loss of a burner, incapability of reaching a designed steam temperature, high concentration of nitrogen oxides at the outlet of the hearth and the like can be solved or relieved.
Furthermore, circulating flue gas is introduced from the bottom of the screen superheater, so that the temperature distribution of the flue gas at the outlet of the hearth can be obviously improved, and the problems of over-temperature and slag bonding of a high-temperature heating surface of the boiler are solved.
Furthermore, the circulating flue gas is introduced from the central wind barrel of the cyclone burner, so that the cooling capacity of the burner can be obviously improved, the temperature distribution of the nozzle area of the burner can be improved, and the problems of slag bonding and burning loss of the nozzle of the cyclone burner can be solved.
Furthermore, the circulating flue gas is introduced from the combustor area, so that the generation of initial nitrogen oxides can be remarkably reduced, and the problems of high-temperature corrosion of a water-cooled wall and burning loss of a cyclone combustor caused by high over-fire air rate are solved.
Furthermore, the circulating flue gas is introduced from the bottom of the hearth, so that the flow and heat exchange characteristics of the flue gas can be obviously improved, the flexibility of regulating the steam temperature of the boiler is improved, and the problems that the steam temperature cannot reach the designed value or the amount of temperature-reducing water is large are solved.
Furthermore, the invention is additionally provided with a smoke circulating system on the basis of the original smoke and air system of the pulverized coal boiler. In practical application, only a flue gas circulation flue, a corresponding damper, a furnace smoke circulation fan and the like are arranged between different parts of a hearth (bottom, a burner area, the bottom of a screen superheater and the like) and a flue (such as a flue at the positions of an induced draft fan outlet, an induced draft fan inlet, an air preheater outlet, an economizer outlet, a turning smoke chamber and the like), and the system is simple and easy to implement. In operation, the mode of recovering to an original flue gas system can be realized through the circulating flue gas damper baffle, and the risk of application failure is avoided. Aiming at different problems of slag bonding of a hearth water-cooled wall and a burner nozzle, burner burning loss, high concentration of nitrogen oxides, substandard steam temperature parameters and the like due to higher temperature of a hearth outlet, the flue gas circulation can be realized by selecting different paths.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
the reference number in the figure is 1-pulverized coal burner, 2-overfire air nozzle, 3-screen type heating surface, 4-convection heating surface, 5-economizer, 6-denitration SCR reactor, 7-air preheater, 8-dust remover, 9-induced draft fan, 10-furnace smoke circulating fan, 11-circulating smoke damper, 12-circulating smoke leading-out mother pipe, 13-circulating smoke leading-in mother pipe, 14-first circulating smoke leading-out port, 15-second circulating smoke leading-out port, 16-third circulating smoke leading-out port, 17-fourth circulating smoke leading-out port, 18-fifth circulating smoke leading-out port, 19-first circulating smoke leading-in port, 20-second circulating smoke leading-in port and 21-third circulating smoke leading-in port.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
Referring to fig. 1, a flue gas circulation system capable of improving combustion characteristics and thermodynamic characteristics of a pulverized coal fired boiler comprises a plurality of circulation flue gas outlet ports (including a first circulation flue gas outlet port 14, a second circulation flue gas outlet port 15, a third circulation flue gas outlet port 16, a fourth circulation flue gas outlet port 17 and a fifth circulation flue gas outlet port 18) arranged on a flue of an outlet of the boiler, a circulation flue gas inlet port (including a first circulation flue gas inlet port 19, a second circulation flue gas inlet port 20 and a third circulation flue gas inlet port 21), a circulation flue gas damper baffle 11, a circulation flue gas outlet pipe, a circulation flue gas flow measuring device, a circulation flue gas temperature measuring point, a circulation flue gas pressure measuring point, a circulation flue gas outlet main pipe 12, a boiler flue gas circulation fan 10, a circulation flue gas inlet main pipe 13, a circulation flue gas inlet pipe, a hearth, a pulverized coal 1, an over-combustion air nozzle 2, a burner, a, The device comprises a screen type heating surface 3, a convection heating surface 4, an economizer 5, a denitration SCR reactor 6, an air preheater 7, a dust remover 8 and an induced draft fan 9.
Specifically, the circulating flue gas outlet is connected with a circulating flue gas outlet main pipe 12 through a circulating flue gas outlet pipeline, the circulating flue gas outlet main pipe 12 is connected with a circulating flue gas inlet main pipe 13, the circulating flue gas inlet main pipe 13 is connected with a circulating flue gas inlet pipeline, and the circulating flue gas inlet pipeline is connected with the hearth.
Flue gas generated after pulverized coal is combusted in a boiler furnace flows along the furnace, a horizontal flue and a tail flue, sequentially passes through a water-cooled wall, a screen-type heating surface 3 of a screen-type superheater, a convection heating surface 4, a turning smoke chamber, an economizer 5, a denitration SCR reactor 6, an air preheater 7, a dust remover 8 and an induced draft fan 9, and is discharged into a desulfurization device and a chimney.
The raw coal powder boiler is provided with 5 or partial flue gas leading-out ports along the flue gas flow path, namely a steering smoke chamber, an economizer outlet, an air preheater outlet, a dust remover outlet and a draught fan outlet, and different flue gas leading-out ports are selected according to requirements to realize the target flow and temperature of the circulating flue gas. The method specifically comprises the following steps: the first flue gas outlet 14 is connected with an outlet flue of the induced draft fan; the second flue gas outlet 15 is connected with an inlet of the induced draft fan, the third flue gas outlet 16 is connected with an outlet flue of the air preheater, the fourth flue gas outlet 17 is connected with an outlet flue of the economizer, and the fifth flue gas outlet 17 is connected with the turning smoke chamber.
3 flue gas introduction ports are arranged in a raw coal powder boiler furnace, a first circulating flue gas introduction port 19 arranged at the bottom of the furnace, a second circulating flue gas introduction port 20 arranged in a burner area and a third circulating flue gas introduction port 21 arranged at the bottom of a platen superheater are arranged, and 1 or more introduction points can be selected to realize different purposes. The method specifically comprises the following steps: the first circulating flue gas inlet 19 is connected to the bottom of the furnace, the second circulating flue gas inlet 20 is connected to the burner area of the furnace, and the third circulating flue gas inlet 21 is connected to the bottom of the furnace of the platen superheater.
Each circulating flue gas introducing pipeline is connected by a circulating flue gas introducing main pipe 13. Each circulating flue gas leading-out pipeline is provided with a leading-out flue gas air door baffle 11, a flue gas temperature measuring device, a flue gas pressure measuring device and a flue gas flow measuring device. Each circulating flue gas leading-out pipeline is merged into a circulating flue gas leading-out main pipe 12, and a leading-out flue gas air door baffle 11 is arranged on the circulating flue gas leading-out main pipe 12.
The circulating flue gas leading-out main pipe 12 is connected with an inlet of a flue gas circulating fan 10, an outlet of the flue gas circulating fan 10 is connected with a circulating flue gas leading-in main pipe 13, the flue gas circulating fan 10 is pressurized and then sent into a hearth, energy required by circulating flue gas extraction and introduction is provided by the flue gas circulating fan 10, and a pressure head and flow rate of the energy are determined through calculation.
The circulating flue gas introducing main pipe 13 is provided with an introducing flue gas air door baffle 11, a flue gas temperature measuring device, a flue gas pressure measuring device and a flue gas flow measuring device.
The total flow of the circulating flue gas can be adjusted according to the requirement, and can be selected in the range of 5-20% of the flow of the flue gas discharged from the flue.
And extracting the flue gas at the outlet of the air preheater and the outlet of the economizer to a central air duct of the cyclone burner, and taking the circulating flue gas as a cooling medium of the burner.
The flue gas is extracted from different positions of the flue of the existing pulverized coal boiler (such as the outlet of an induced draft fan, the inlet of the induced draft fan, the outlet of an air preheater, the outlet of an economizer, a turning smoke chamber and other part flues), and is pressurized by a flue gas circulating fan 10 and then sent into a hearth to form a flue gas circulating system. The position of the flue gas fed into the furnace is a first circulating flue gas inlet 19 at the bottom of the furnace, a second circulating flue gas inlet 20 at the burner area or a third circulating flue gas inlet 21 at the bottom of the platen superheater.
Example 1
For the problems such as overtemperature and slagging of the tube wall of a high-temperature heating surface caused by the higher temperature of the outlet of the hearth, the flue gas can be extracted from position flues such as the outlet of an induced draft fan (a first flue gas outlet 14), the inlet of the induced draft fan (a second flue gas outlet 15), the outlet of an air preheater (a third flue gas outlet 16) and the outlet of an economizer (a fourth flue gas outlet 17), and the flue gas is sent to the hearth near the bottom area of a screen superheater (a third circulating flue gas inlet 21), so that the temperature distribution of the flue gas at the outlet of the hearth is improved. Specifically, flue gas in an outlet area of the economizer can be introduced to a bottom area of the screen superheater, when the flow of circulating flue gas is 10% of the flow of flue gas exhausted from the flue gas, the temperature of the flue gas at an outlet of a hearth is reduced by about 100 ℃, and the problems of over-temperature and slagging of a high-temperature heating surface can be remarkably improved.
Example 2
For the problems of slag bonding of a water-cooled wall of a hearth and a nozzle of a combustor, burning loss of the combustor and the like, the flue gas can be extracted from the positions of a third circulating flue gas outlet 16 of an outlet of an air preheater, a fourth circulating flue gas outlet 17 of an outlet of an economizer, a fifth circulating flue gas outlet 18 of a turning flue chamber and the like and is fed into the hearth from a second circulating flue gas inlet 20 of a combustor area, so that the flame temperature of the hearth is reduced. Specifically, the flue gas at the outlet of the air preheater and the outlet of the economizer can be extracted to the central air duct of the cyclone burner, and the circulating flue gas is used as a cooling medium of the burner, so that the reliability of the spare layer cyclone burner can be greatly improved.
Example 3
For reducing the concentration of nitrogen oxides, the medium-high temperature flue gas can be extracted from the positions of a fourth circulating flue gas outlet 17 at the outlet of the economizer, a fifth circulating flue gas outlet 18 of a turning smoke chamber and the like, and the medium-high temperature flue gas is fed into a second circulating flue gas inlet 20 of a burner area, namely primary air, secondary air and over-fire air, so that the primary nitrogen oxides are inhibited from being generated by reducing the temperature and the oxygen content of a combustion area, and the aim of reducing the emission of the nitrogen oxides is fulfilled. Specifically, the fourth circulating flue gas leading-out port 17 at the outlet of the economizer and the fifth circulating flue gas leading-out port 18 at the turning smoke chamber can be extracted to the primary air, secondary air and over-fire air nozzles of the combustor, so that the circulating flue gas replaces the air which does not participate in combustion in the area, and the over-fire air rate is reduced. When the introduced circulating flue gas amount reaches 10 percent of the total flue gas amount, the concentration of nitrogen oxides can be reduced by about 100mg/m3. At the moment, the introduction of the circulating flue gas can also improve the adherence atmosphere of the water wall, relieve the problems of high-temperature corrosion and coking of the water wall, reduce the power consumption of a draught fan and reduce the consumption of a reducing agent of a denitration SCR system.
Example 4
For the problem that the steam temperature parameter does not reach the standard, the flue gas can be extracted from the positions of a first circulating flue gas outlet 14 on an outlet flue of the induced draft fan, a second circulating flue gas outlet 15 on an inlet flue of the induced draft fan, a third circulating flue gas outlet 16 on an outlet flue of the air preheater, a fourth circulating flue gas outlet 17 on an outlet flue of the economizer, a fifth circulating flue gas outlet 18 of the turning smoke chamber and the like, and the flue gas is sent into the hearth from a first circulating flue gas inlet 19 at the bottom of the hearth, so that the flow rate of the flue gas and the heat absorption capacity of the convection heating surface 4 are improved, and the steam temperature regulation characteristic of the boiler is improved. Specifically, an outlet of the induced draft fan and an outlet of the economizer can be extracted to the bottom of the hearth (the upper part of a folded angle of the ash cooling bucket) so as to change the heat absorption ratio of the radiation heating surface to the convection heating surface 4 and improve the adjustment flexibility of the main reheat steam temperature and the reheat steam temperature.
Claims (8)
1. The flue gas circulation system is characterized by comprising a plurality of circulating flue gas leading-out ports arranged on a hearth outlet flue of a boiler, wherein the circulating flue gas leading-out ports are connected with a circulating flue gas leading-out main pipe (12) through a circulating flue gas leading-out pipeline, the circulating flue gas leading-out main pipe (12) is connected with a circulating flue gas leading-in main pipe (13), the circulating flue gas leading-in main pipe (13) is connected with a circulating flue gas leading-in pipeline, and the circulating flue gas leading-in pipeline is connected with a hearth.
2. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of a pulverized coal-fired boiler according to claim 1, wherein the circulating flue gas leading-out main pipe (12) is connected with an inlet of a flue gas circulating fan (10), and an outlet of the flue gas circulating fan (10) is connected with a circulating flue gas leading-in main pipe (13).
3. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of the pulverized coal fired boiler according to claim 1, wherein the circulating flue gas outlet comprises one or more of a first circulating flue gas outlet (14), a second circulating flue gas outlet (15), a third circulating flue gas outlet (16), a fourth circulating flue gas outlet (17) and a fifth circulating flue gas outlet (18).
4. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of the pulverized coal fired boiler according to claim 3 is characterized in that a platen superheater, a turning smoke chamber, an air preheater (7) and an induced draft fan (9) are arranged on a flue at the outlet of a hearth of the boiler;
the first flue gas outlet (14) is connected with an outlet flue of the induced draft fan; the second flue gas outlet (15) is connected with an inlet of the induced draft fan, the third flue gas outlet (16) is connected with an outlet flue of the air preheater, the fourth flue gas outlet (17) is connected with an outlet flue of the economizer, and the fifth flue gas outlet (18) is connected with the turning smoke chamber.
5. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of the pulverized coal-fired boiler according to claim 1, wherein the bottom of the furnace is provided with a plurality of introduction ports, and the introduction ports comprise one or more of a first circulation flue gas introduction port (19) arranged at the bottom of the furnace, a second circulation flue gas introduction port (20) arranged at the burner region and a third circulation flue gas introduction port (21) arranged at the bottom of the platen superheater.
6. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of the pulverized coal fired boiler according to claim 1 is characterized in that an outlet flue gas damper baffle (11) is arranged on the circulating flue gas outlet main pipe (12).
7. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of the pulverized coal fired boiler according to claim 1, wherein a flue gas inlet damper baffle (11) and a flue gas flow measuring device are arranged on the circulating flue gas inlet main pipe (13).
8. The flue gas circulation system for improving the combustion characteristics and the thermal characteristics of the pulverized coal-fired boiler according to claim 1 or 7, wherein a flue gas temperature measuring device and a flue gas pressure measuring device are arranged on the circulating flue gas introduction main pipe (13).
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210417474.0A CN114659099A (en) | 2022-04-20 | 2022-04-20 | Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler |
| PCT/CN2023/089274 WO2023202634A1 (en) | 2022-04-20 | 2023-04-19 | Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210417474.0A CN114659099A (en) | 2022-04-20 | 2022-04-20 | Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023202634A1 (en) * | 2022-04-20 | 2023-10-26 | 西安热工研究院有限公司 | Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler |
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| CN212777312U (en) * | 2020-08-13 | 2021-03-23 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Flue gas recirculation system for ultra-supercritical secondary reheating boiler |
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| CN213453608U (en) * | 2020-10-15 | 2021-06-15 | 西安西热锅炉环保工程有限公司 | W flame boiler degree of depth peak shaving system based on flue gas recirculation |
| CN114659099A (en) * | 2022-04-20 | 2022-06-24 | 西安热工研究院有限公司 | Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler |
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| CN112097250A (en) * | 2020-10-15 | 2020-12-18 | 西安西热锅炉环保工程有限公司 | W flame boiler deep peak regulation system and method based on flue gas recirculation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023202634A1 (en) * | 2022-04-20 | 2023-10-26 | 西安热工研究院有限公司 | Flue gas circulation system for improving combustion characteristics and thermal characteristics of pulverized coal fired boiler |
Also Published As
| Publication number | Publication date |
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| WO2023202634A1 (en) | 2023-10-26 |
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