CN210462982U - Flue gas forced internal circulation boiler - Google Patents
Flue gas forced internal circulation boiler Download PDFInfo
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- CN210462982U CN210462982U CN201920992605.1U CN201920992605U CN210462982U CN 210462982 U CN210462982 U CN 210462982U CN 201920992605 U CN201920992605 U CN 201920992605U CN 210462982 U CN210462982 U CN 210462982U
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- flue gas
- boiler
- circulating
- nozzle
- internal circulation
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/02—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography
- B01D53/04—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols by adsorption, e.g. preparative gas chromatography with stationary adsorbents
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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
- 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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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23D—BURNERS
- F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
- F23D14/46—Details, e.g. noise reduction means
- F23D14/48—Nozzles
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- 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
- F23L5/00—Blast-producing apparatus before the fire
- F23L5/02—Arrangements of fans or blowers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N3/00—Regulating air supply or draught
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/26—Details
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Analytical Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Treating Waste Gases (AREA)
- Chimneys And Flues (AREA)
Abstract
The utility model discloses an inner loop boiler is forced to flue gas absorbs the fuel spout that partly flue gas directly returns the furnace combustor through circulating in the boiler inside moderate flue gas temperature region, directly mixes with fuel, dilutes fuel to reduce the concentration of mixing with oxygen, thereby reduce combustion temperature. The horn-shaped nozzle is installed at the outlet of the circulating flue gas, the denitriding adsorbent is filled in the nozzle cavity and used for reducing the content of nitrogen oxides in the circulating flue gas, meanwhile, the gas outlet hole of the flue gas on the nozzle is designed, so that the circulating flue gas is uniformly sprayed out in a launching manner and is fully mixed with fuel, and the circulating amount of the circulating flue gas is controlled by adjusting the frequency of a circulating fan or an air adjusting door. By monitoring the concentration of NOx in the flue gas discharge pipe on line and continuously adjusting the frequency of the circulating fan and the flow of the combustion-supporting air, the optimal parameters are obtained so as to reduce the concentration of NOx in the discharged flue gas.
Description
Technical Field
The utility model belongs to the technical field of the environmental protection burning, especially, relate to a flue gas forced internal circulation boiler.
Background
Along with the aggravation of environmental pollution and the increasing shortage of energy sources, people pay more and more attention to realizing energy conservation and emission reduction through a novel combustion mode at present. The flue gas recirculation technology has the advantages of reducing NOx emission and improving combustion efficiency, is widely applied to the fields of industrial combustors, boilers and the like, and achieves better energy-saving and emission-reducing effects. The combustion can be effectively improved through reasonable design of the realization form, the circulation temperature and the circulation amount of the flue gas recirculation, the effects of reducing pollution emission and improving the combustion efficiency are achieved, and the method is one of important methods for energy conservation and emission reduction.
The flue gas recirculation means that a part of low-temperature flue gas is extracted in front of an air preheater of a boiler and is directly sent into the boiler, or is sent into the boiler after being mixed with primary air or secondary air, so that the combustion temperature can be reduced, the oxygen concentration can be reduced, and the emission concentration of nitrogen oxides is reduced.
The internal circulation of flue gas of the existing domestic and overseas low-nitrogen combustors is passive circulation, and supply and quantity adjustment cannot be performed according to actual requirements in a targeted manner. The external circulation of the flue gas to be connected for diluting the oxygen content of the combustion-supporting air is realized through a combustion-supporting air supply pipeline, so that about 20 percent of non-combustible media are added to circulate among long flows among an air duct, a combustor, a hearth, a convection pipe, a waste heat boiler, an air preheater, a flue and the air duct, and the energy consumption is inevitably increased by the circulation flow.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects that the smoke recirculation in the furnace can not be controlled and the smoke recirculation consumption energy outside the furnace is not strong in pertinence in the prior art, the utility model discloses a forced internal circulation gas low-nitrogen combustion boiler, the traditional external circulation is replaced by the internal circulation.
The utility model discloses a through the circulation absorb partly flue gas in the inside medium flue gas temperature region of boiler and directly return the fuel spout of furnace combustor, directly mix with fuel, dilute fuel to reduce the concentration of mixing with oxygen, thereby reduce combustion temperature. The horn-shaped nozzle is installed at the outlet of the circulating flue gas, the denitriding adsorbent is filled in the nozzle cavity and used for reducing the content of nitrogen oxides in the circulating flue gas, meanwhile, the gas outlet hole of the flue gas on the nozzle is designed, so that the circulating flue gas is uniformly sprayed out in a launching manner and is fully mixed with fuel, and the circulating amount of the circulating flue gas is controlled by adjusting the frequency of a circulating fan or an air adjusting door. By monitoring the concentration of NOx in the flue gas discharge pipe on line and continuously adjusting the frequency of the circulating fan and the flow of the combustion-supporting air, the optimal parameters are obtained so as to reduce the concentration of NOx in the discharged flue gas.
In order to achieve the above purpose, the utility model adopts the following technical scheme:
a flue gas forced internal circulation boiler is characterized by comprising a hearth, a flue gas forced internal circulation system, a flue gas discharge pipe, a chimney, a fuel outlet, a combustion-supporting air channel and an air blower, wherein the flue gas forced internal circulation system comprises a variable frequency fan, an electric regulating valve, a circulating flue gas inlet and a circulating flue gas outlet;
the flue gas outlet detachable installs hollow horn-shaped nozzle, the nozzle includes that the cross-section is circular shape inlet end face and termination end face, inlet end face, termination section and side enclose into hollow cavity, open the side has a series of apertures that are used for exporting the circulation flue gas.
Furthermore, the area of the air inlet end face of the horn-shaped nozzle is smaller than that of the termination end face, the air inlet end face is a hollow circular tube, and the termination section is a closed plane.
Furthermore, the side surface of the nozzle is provided with a plurality of rows of small holes along the circumferential direction, the small holes are distributed on the sections of the horn-shaped nozzle which are parallel to each other, and the shape of the small holes is circular or oval.
Further, the horn-shaped nozzle is filled with a granular denitrification adsorbent, the granules are spherical, and the particle size is 0.5-3 cm. The adsorbent is one or more of molecular sieve, activated carbon, activated coke, natural zeolite or peat.
Furthermore, the variable frequency fan is used for adjusting the suction volume of the circulating flue gas, and the frequency of the variable frequency fan is set to be 10-50 HZ.
Further, the electric control valve is used for adjusting the outflow of the circulating flue gas, and the valve opening degree of the electric control valve is set to be 5-95%.
Furthermore, an NOx online monitoring instrument is arranged on the flue gas discharge pipe and used for detecting the content of NOx in the flue gas discharged through the chimney.
Furthermore, a flow controller is arranged on the combustion-supporting air channel and used for adjusting the flow of the combustion-supporting air.
The utility model has the advantages as follows:
a part of flue gas is absorbed by the draught fan in a medium flue gas temperature area in the boiler and directly returns to a fuel nozzle of a hearth combustor to be mixed with fuel and dilute the concentration of the fuel and oxygen, so that the combustion temperature is reduced, and the generation amount of NOx is reduced.
(1) The utility model has the advantages of direct mixing of the recirculated flue gas and the fuel, strong pertinence, simple pipeline structure and reduced equipment cost;
(2) the circulating flue gas is forcibly circulated by a fan, the circulating amount of the flue gas can be controlled by the motor frequency of the fan or an air adjusting valve, the circulating amount of the flue gas is adjusted according to the content of NOx in the flue gas discharged by the boiler, and the circulating amount of the flue gas is maximized and the NOx in the discharged flue gas is reduced as much as possible under the condition of meeting the force supply of the boiler;
(3) the recirculated flue gas is subjected to small circulation in the hearth and the flue gas forced internal circulation system, and the power consumed by the motor is small due to the short flow and the small resistance.
(4) The outlet of the circulating flue gas is provided with a horn-shaped nozzle, so that the circulating flue gas is uniformly sprayed out in a launching way, and the cavity of the nozzle is filled with a denitriding adsorbent for reducing the content of nitrogen oxides in the circulating flue gas.
Drawings
FIG. 1 is a schematic structural diagram of a flue gas forced internal circulation boiler;
FIG. 2 is a top view of a circulating flue gas outlet nozzle of a flue gas forced internal circulation boiler;
in the figure, 1 is a flue gas outlet nozzle, 2 is a small hole of the nozzle, 3 is a variable frequency fan, 4 is a hearth, 5 is a flue gas discharge pipe, 6 is a chimney, 7 is a fuel outlet, 8 is a combustion-supporting air channel, 9 is a circulating outlet, and 10 is an air blower.
Detailed Description
The embodiments of the present invention will be further explained with reference to the drawings.
Example 1
The utility model provides an internal circulation boiler is forced to flue gas, including furnace 4, the internal circulation system is forced to flue gas, flue gas discharge pipe 5, chimney 6, fuel outlet 7 and combustion-supporting wind passageway 8, air-blower 10, the internal circulation system is forced to flue gas includes frequency conversion fan 3, electrical control valve, circulation flue gas import and circulation exhanst gas outlet 9, frequency conversion fan 3 fixed mounting is at the lateral wall of furnace 4, frequency conversion fan 3's air intake and furnace 4 intercommunication, frequency conversion fan's air outlet and circulation flue gas import intercommunication, frequency conversion fan absorbs partly flue gas from the inside medium flue gas temperature region of boiler and directly returns furnace combustor fuel spout, frequency conversion fan's frequency sets up to 10~50 HZ. The circulating flue gas and the fuel are uniformly mixed and then combusted, so that the concentration of the fuel is reduced, the temperature in a hearth is reduced, and the generation of nitrogen oxides is reduced. An electric control valve is arranged on a pipeline between the circulating flue gas inlet and the circulating flue gas outlet and used for controlling the suction amount of the circulating flue gas, the opening degree of a valve of the electric control valve is set to be 5-95%, when the temperature in the hearth is overhigh, the suction amount of the circulating flue gas is increased when the content of nitric oxide discharged by a chimney is detected to be increased, and the fuel concentration is further diluted; when the temperature in the hearth is low and the boiler is insufficient in power supply, the suction amount of circulating flue gas is reduced, so that the fuel concentration is increased, the flame range is enlarged, and the temperature is increased. The inlet of the flue gas discharge pipe 5 is arranged at the upper part of the hearth, the outlet of the flue gas discharge pipe is connected with a chimney outside the hearth and used for directly discharging part of the flue gas in the hearth from the chimney, and the flue gas discharge pipe is provided with an NOx online monitoring instrument used for detecting the content of NOx in the flue gas discharged through the chimney. The inlet of the combustion-supporting air channel is connected with the blower outside the hearth, and the outlet of the combustion-supporting air channel is arranged in the hearth and used for providing an oxygen source for the fuel in the hearth.
The detachable hollow horn-shaped nozzle 1 that installs of exhanst gas outlet, the nozzle include that the cross-section is circular shape inlet end face and termination end face, and inlet end face, termination section and side enclose into hollow cavity, the side is opened has a series of apertures 2 that are used for exporting the circulation flue gas. The area of the air inlet end face of the horn-shaped nozzle is smaller than that of the termination end face, the air inlet end face is a hollow circular tube, and the termination end face is a closed plane. When the circulating flue gas rapidly flows in from the inlet of the nozzle, the circulating flue gas rapidly reaches the closed end face, the impact force is reduced after the airflow turns back, the airflow is scattered and sprayed out from the small holes on the side face, the flue gas is uniformly output from the periphery of the nozzle, the flue gas is fine and uniform, the impact force is weaker, the flue gas is favorably mixed with fuel under the stable condition, and the impact force of the airflow in the hearth is reduced.
The side of the nozzle is provided with a plurality of rows of round or oval small holes along the circumferential direction, the small holes are distributed on each parallel section of the horn-shaped nozzle, which is equivalent to that the nozzles are distributed spirally on the side of the nozzle, thus being beneficial to the uniform and stable output of the smoke.
And a detachable horn-shaped nozzle is filled with a granular denitrification adsorbent, the granules are spherical, and the particle size is 0.5-3 cm. The adsorbent is one or more of molecular sieve, activated carbon, activated coke, natural zeolite or peat. The flue gas passing through the nozzle is subjected to nitrogen oxide removal by using the adsorbent, and the nozzle can be detached, so that the adsorbent with saturated adsorption capacity can be conveniently replaced. In addition, the cost of the adsorbent is low, and the recovered adsorbent can be reused after treatment.
The method of using the low nox emission burner is further illustrated by the following examples.
Example 2
A smoke forced internal circulation boiler is characterized in that an air blower is started, combustion-supporting air is input into a hearth through a combustion-supporting air channel, a fuel outlet is ignited, a variable frequency fan is started, smoke in the hearth is sucked into a circulation smoke inlet, the smoke and fuel are mixed through a circulation smoke outlet, the content of NOx in the smoke discharged through a chimney is detected on the premise that the boiler is satisfied with the force, and when the NOx in the discharged smoke is larger than 30mg/Nm3During the process, the outflow of the circulating flue gas is increased through an electric regulating valve and the motor frequency, the maximum opening degree of the valve is 95%, and the motor frequency is 10-50 HZ.
Use the utility model discloses, but energy saving consumes, about than current flue gas extrinsic cycle technique saving 50% motor consumption. Taking a certain type of boiler (25 t/h) as an example, under the condition of achieving the same flue gas recirculation amount, the flow resistance of flue gas recirculation only needs 2000Pa, and only about 15kw of power needs to be consumed. Meanwhile, the required flow cross-sectional areas of all the devices (a main boiler, a waste heat boiler, a flue, an air duct and an air preheater) can be reduced by 20 percent, and the device cost can be saved by about 20 percent. And the NOx emission index of the gas-fired heat conduction oil boiler can reach less than 30mg/m 3.
Claims (10)
1. A flue gas forced internal circulation boiler is characterized by comprising a hearth, a flue gas forced internal circulation system, a flue gas discharge pipe, a chimney, a fuel outlet, a combustion-supporting air channel and an air blower, wherein the flue gas forced internal circulation system comprises a variable frequency fan, an electric regulating valve, a circulating flue gas inlet and a circulating flue gas outlet;
the flue gas outlet detachable installs hollow horn-shaped nozzle, the nozzle includes that the cross-section is circular shape inlet end face and termination end face, inlet end face, termination section and side enclose into hollow cavity, open the side has a series of apertures that are used for exporting the circulation flue gas.
2. The boiler of claim 1, wherein the area of the air inlet end surface of the trumpet-shaped nozzle is smaller than that of the end surface, the air inlet end surface is a hollow circular tube, and the end surface is a closed plane.
3. The boiler of claim 1, wherein the nozzle has a plurality of rows of small holes along the circumferential direction, and the small holes are distributed on the parallel cross sections of the trumpet-shaped nozzle.
4. The forced flue gas internal circulation boiler of claim 3, wherein the shape of the small holes is circular or elliptical.
5. The boiler of claim 1, wherein the trumpet-shaped nozzle is filled with a particulate denitrogenation adsorbent, and the particles are spherical and have a particle size of 0.5-3 cm.
6. The boiler of claim 5, wherein the adsorbent is one or more of molecular sieve, activated carbon, activated coke, natural zeolite or peat.
7. The boiler with the forced internal circulation of flue gas as claimed in claim 1, wherein the variable frequency fan is used for adjusting the suction amount of the circulating flue gas, and the frequency of the variable frequency fan is set to be 10-50 Hz.
8. The boiler of claim 1, wherein the electric control valve is used for adjusting the outflow of the circulating flue gas, and the valve opening of the electric control valve is set to be 5-95%.
9. The boiler of claim 1, wherein the flue gas discharge pipe is provided with an online NOx monitoring device for detecting the NOx content in the flue gas discharged through the chimney.
10. The boiler of claim 1, wherein a flow controller is disposed on the combustion-supporting air channel for adjusting the flow of the combustion-supporting air.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992605.1U CN210462982U (en) | 2019-06-28 | 2019-06-28 | Flue gas forced internal circulation boiler |
| PCT/CN2020/098075 WO2020259576A1 (en) | 2019-06-28 | 2020-06-24 | Forced internal flue gas circulation furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201920992605.1U CN210462982U (en) | 2019-06-28 | 2019-06-28 | Flue gas forced internal circulation boiler |
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| Publication Number | Publication Date |
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| CN210462982U true CN210462982U (en) | 2020-05-05 |
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| CN201920992605.1U Active CN210462982U (en) | 2019-06-28 | 2019-06-28 | Flue gas forced internal circulation boiler |
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| Country | Link |
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| CN (1) | CN210462982U (en) |
| WO (1) | WO2020259576A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110375293A (en) * | 2019-06-28 | 2019-10-25 | 浙江先创能源科技股份有限公司 | A kind of interior combined-circulation once-through boiler of flue gas pressure |
| WO2020259576A1 (en) * | 2019-06-28 | 2020-12-30 | 浙江先创能源科技股份有限公司 | Forced internal flue gas circulation furnace |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2028504A6 (en) * | 1989-04-07 | 1992-07-01 | Balsiger Benno | Apparatus for flue gas recirculation in oil and gas burners. |
| DE4006806A1 (en) * | 1990-03-05 | 1991-09-12 | Kloeckner Waermetechnik | Fan fitted burner with flue gas return pipe - has air inlet in pipe at point of flue-gas temp. above dew-point |
| CN104964274A (en) * | 2015-07-02 | 2015-10-07 | 山东建筑大学 | Smoke waste heat recovery and re-circulating temperature adjusting method and system of natural gas oxygen-rich combustion furnace |
| CN204943454U (en) * | 2015-07-02 | 2016-01-06 | 山东建筑大学 | The flue gas waste heat recovery of natural gas oxygen-enriched combustion furnace and recirculation thermoregulating system |
| CN106439796A (en) * | 2016-11-09 | 2017-02-22 | 中国环境科学研究院 | Flue gas volume/nitric oxide emission reduction system of low-load coal-fired boiler |
| CN207527589U (en) * | 2017-08-11 | 2018-06-22 | 西安胜元冶金节能技术有限公司 | Natural gas low nitrogen burning energy saver and combustion gas induced polarization device |
| CN109442392A (en) * | 2018-11-06 | 2019-03-08 | 清华大学 | A kind of gas fired-boiler and its low nitrogen burning method |
| CN109631022A (en) * | 2018-12-18 | 2019-04-16 | 哈尔滨工业大学 | A kind of coal powder burner with flue gas recirculation for industrial coal powder boiler |
| CN110375293A (en) * | 2019-06-28 | 2019-10-25 | 浙江先创能源科技股份有限公司 | A kind of interior combined-circulation once-through boiler of flue gas pressure |
| CN210462982U (en) * | 2019-06-28 | 2020-05-05 | 浙江先创能源科技股份有限公司 | Flue gas forced internal circulation boiler |
-
2019
- 2019-06-28 CN CN201920992605.1U patent/CN210462982U/en active Active
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2020
- 2020-06-24 WO PCT/CN2020/098075 patent/WO2020259576A1/en active Application Filing
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110375293A (en) * | 2019-06-28 | 2019-10-25 | 浙江先创能源科技股份有限公司 | A kind of interior combined-circulation once-through boiler of flue gas pressure |
| WO2020259576A1 (en) * | 2019-06-28 | 2020-12-30 | 浙江先创能源科技股份有限公司 | Forced internal flue gas circulation furnace |
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| WO2020259576A1 (en) | 2020-12-30 |
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