CN106524135A - Flue gas recycling system and method for achieving boiler full-load low-oxygen low-nitrogen combustion - Google Patents
Flue gas recycling system and method for achieving boiler full-load low-oxygen low-nitrogen combustion Download PDFInfo
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- CN106524135A CN106524135A CN201611068850.0A CN201611068850A CN106524135A CN 106524135 A CN106524135 A CN 106524135A CN 201611068850 A CN201611068850 A CN 201611068850A CN 106524135 A CN106524135 A CN 106524135A
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- 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
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Abstract
The invention discloses a flue gas recycling system which at least comprises a flue gas suction outlet, a glue gas baffle, a cyclic pressurization fan, a flue gas inlet and an additional flue connected with the flue gas suction outlet, the glue gas baffle, the cyclic pressurization fan and the flue gas inlet. The invention further provides a method for achieving boiler full-load low-oxygen low-nitrogen combustion. For a boiler which can achieve combustion well even though having the full-load hearth outlet flue gas low oxygen content, the cyclic pressurization fan is utilized for feeding flue gas into a hearth through the additional flue so as to replace hot air entering the boiler, the convection heating surface flue gas flowing speed and heat exchange coefficients are ensured, the full-load hearth outlet flue gas oxygen content is greatly reduced, the unit steam temperature is ensured, auxiliary power is greatly reduced, the boiler glue gas loss is reduced, and the unit economy and environmental protection property are improved.
Description
Technical field
The present invention relates to a kind of flue gas recycling system and the method for realizing the burning of boiler full load low oxygen and low nitrogen, belong to fire
Power power field.
Background technology
Heat economy of the temperature of the boiler combustion situation of coal-fired reheating embrittlement and main steam and reheated steam to whole system
Property, safety and the feature of environmental protection there is material impact, if combustion position is poor, boiler efficiency is low, while phosphorus content is high in flying dust, meeting
The abrasion of each heating surface of aggravation burner hearth, the mechanical wear of SCR catalyst, also, stick to SCR catalyst, air preheater ripple
High carbon containing combustible on card, electrostatic precipitator pole plate is in heavy-duty service, it is also possible to second-time burning occurs and damages and sets
It is standby；And if the temperature of main steam and reheated steam does not reach design temperature, thermal efficiency of cycle relative reduction can be caused.Therefore,
Under modern coal-fired power plant is in order to ensure the good combustion efficiency of boiler, especially performing low-load running of machine set operating mode, typically with
Premised on improving the intake of boiler, then it is aided with a series of means for adjusting vapor (steam) temperature to ensure efficiency of combustion and steam temperature
Degree, though this can improve the combustion case of boiler to a certain extent, but is contained with improving inlet air of boiler amount and furnace outlet flue gas
Premised on oxygen amount, not only so that NO_x formation concentration during boiler combustion is significantly increased, whole exhaust gas volumn can be also caused to increase
Plus, cause blower fan power consumption and flue gas loss to increase.Thus, this is substantially a kind of high nitrogen combustion system of hyperoxia, and category power consumption increases row.
In recent years, constantly bringing forth new ideas and progressive with China's thermal power generating technology, also occurs in that some new improvement boilers
The method of burning, for example：Patent " ZL201310360162.1 " is proposed a kind of widens the method that extracted steam from turbine is utilized；Patent
" ZL201110459533.2 " proposes a kind of adjustable feed water heat regenerative for Turbo-generator Set, and these methods are broken
Traditional Combustion boundary conditions are relative to improve boiler input media（The mixture such as wind, powder）Temperature and as-fired coal powder
Aridity, thus, in the case of burner hearth underload, hypoxia amount, still can effectively guarantee good boiler combustion situation, improve pot
Stove efficiency of combustion, this creates advantage for the operation for reducing full load furnace outlet flue gas oxygen content.However, said method
Using after, to reduce the operation of furnace outlet flue gas oxygen content, especially under underrun operating mode, even if can ensure that good
Boiler combustion effect, but exhaust gas volumn can also be greatly reduced, in stove, the coefficient of heat transfer of convection heating surface relative can be greatly reduced, right
In dum boiler, it may appear that the problem that superheat steam temperature and reheat steam temperature all decline；For direct current cooker, then also meet
Face the problem that reheat steam temperature cannot be ensured, in particular by hot mode, tower boiler again twice, reheat steam temperature is not
The problem of foot is more projected.And the deficiency of reheat steam temperature, directly caused declining to a great extent for unit economy, in other words,
After said method application, in the case of relatively low furnace outlet flue gas oxygen content, that is, combustion efficiency is ensured, but causes machine
Group vapor (steam) temperature declines the decline of caused economy, or even loses more than gain.And existing raising main steam and reheated steam temperature
The technology of degree, such as tilting burner, separation damper actuator, steam soot blowing adjust method, though can carry to a certain extent
Reheat steam temperature is risen, but is also difficult to make up the reheat steam temperature reduction caused because reducing the average burner hearth oxygen content of full load
Degree.Meanwhile, the application of these technologies also has various limiting factors, and for example, tilting burner adjusts reheated steam temperature
Degree technology is limited to pivot angle hunting range；Gas baffle regulation technology is used for π type stoves, and the gas baffle of novel tower-type stove is adjusted
Technology is simply possible to use in new-built unit, and the tower-type furnace to transforming is not applied to；And the regulation inertia of steam soot blowing regulation method is larger.
Therefore, how to realize, in the case of the average burner hearth oxygen content of full load is greatly reduced, both having guaranteed good burning feelings
Condition, in turn, ensures that the reheat steam temperature of boiler, with the low oxygen and low nitrogen combustion realized in the range of boiler full load truly
Burn, be the problem for still needing to solve in industry field.
The content of the invention
For above-mentioned purpose, the invention provides a kind of flue gas recycling system.Contain guaranteeing that unit full load burner hearth is low
Under the premise of there is good combustion efficiency under oxygen amount, and the homoiothermic means limit such as other burner pivot angle, gas baffles
In the case of still can not maintain steam temperature in the case of, using the system, can be lifted underload cigarette speed, reach maintenance underload under
Vapor (steam) temperature, finally realizes that boiler full load low oxygen and low nitrogen burns.
The present invention provides a kind of flue gas recycling system, and the system at least includes flue gas outlet port, gas baffle, circulation
Booster fan, flue gas access port and connect the flue gas outlet port, the gas baffle, the circularly-supercharged blower fan and described
The newly-increased flue of flue gas access port.
The gas baffle, the circularly-supercharged wind turbine layout in the newly-increased flue, flue gas outlet port position
It is located on economizer exit or its follow-up flue, the flue gas access port position is located at burner hearth bottom or furnace outlet or heat is secondary
The entrance of wind bellows.The gas baffle is to adjust exhaust gas volumn into burner hearth, flue-gas temperature, or cut-out into the cigarette of burner hearth
Tolerance.
Specifically, the flue gas outlet port is one, and the gas baffle is one, and the flue gas access port is one.
Specifically, the flue gas outlet port is multiple, and the gas baffle is multiple, and the flue gas access port is one.
Specifically, the flue gas outlet port is one, and the gas baffle is multiple, and the flue gas access port is multiple.
Specifically, the flue gas outlet port is one, and the gas baffle is one, and the flue gas access port is multiple.
Specifically, the flue gas outlet port is multiple, and the gas baffle is multiple, and the flue gas access port is multiple.
Specifically, the circularly-supercharged blower fan is at least one.
Present invention also offers the method for realizing the burning of boiler full load low oxygen and low nitrogen using flue gas recycling system.
Comprise the following steps：Step 1, for possess full load furnace outlet flue gas low oxygen content but still can good combustion
Boiler, partial fume is extracted out from flue gas outlet port by circularly-supercharged blower fan, the flue gas of extraction is flowed through by increasing flue newly
Gas baffle is admitted to flue gas access port.
Step 2, under different load operating mode, by control into burner hearth air output and the gas baffle adjust into
Enter the exhaust gas volumn of burner hearth, and then adjust the oxygen content and unit vapor (steam) temperature of burner hearth.
In step 1, the flue gas outlet port is one, and the gas baffle is one, and the flue gas access port is one
It is individual, flue gas is extracted out from a flue gas outlet port one is sent into through a gas baffle, the circularly-supercharged blower fan
The individual flue gas access port.
Specifically, in step 1, the flue gas outlet port is multiple, and the gas baffle is multiple, and the flue gas is accessed
Mouth is one, flue gas is extracted out through multiple gas baffles from multiple flue gas outlet ports, again by described after converging
Circularly-supercharged blower fan sends into a flue gas access port.
Specifically, in step 1, the flue gas outlet port is one, and the gas baffle is multiple, and the flue gas is accessed
Mouth is multiple, through the circularly-supercharged blower fan after flue gas is extracted out from a flue gas outlet port, is entered back into many after shunting
The individual gas baffle, is then respectively fed to multiple flue gas access ports.
Specifically, in step 1, the flue gas outlet port is one, and the gas baffle is one, and the flue gas is accessed
Mouth is multiple, through the gas baffle, the circularly-supercharged blower fan after flue gas is extracted out from a flue gas outlet port, point
It is respectively fed to multiple flue gas access ports after stream again.
Specifically, in step 1, the flue gas outlet port is multiple, and the gas baffle is multiple, and the flue gas is accessed
Mouth is multiple, flue gas is extracted out after multiple gas baffles from multiple flue gas outlet ports, is increased by the circulation
Pressure fan, is then respectively fed to multiple flue gas access ports
Boiler furnace combustion case is bad, or the abnormal conditions such as fan trouble are when occurring, and can be cut by closing gas baffle
Gas recycling of giving up smoking system enters the flue gas stream of boiler furnace.
The know-why of the present invention is, using the existing technology for improving burning, to guarantee unit full load burner hearth low oxygen content
Under the premise of there is good combustion efficiency down, and the feelings of the homoiothermic means limit such as other burner pivot angle, gas baffles
In the case of unit steam temperature can not be maintained still under condition, using flue gas recycling system, the cigarette speed of underload is lifted, maintenance is reached
Unit vapor (steam) temperature under underload, finally realizes that boiler full load low oxygen and low nitrogen burns.Particularly further by part cigarette
Gas is fed again into burner hearth, and by adjusting into kiln gas amount under different load operating mode so that unit is in whole load operation model
In enclosing, good burning was both kept under low oxygen level, and due to the recycling again of flue gas, had improve convection heating surface
Flue gas flow rate and the coefficient of heat transfer, enhance heat transfer effect, reach the effect for effectively lifting unit vapor (steam) temperature, you can realize complete negative
Lotus low oxygen and low nitrogen burns.
The present invention has advantages below and effect：
1) present invention achieves the low oxygen and low nitrogen burning of boiler full load operation, had both ensured combustion efficiency, and in turn ensured that steam
Therefore temperature, entirely enters stove air quantity, exhaust gas volumn and all can decline, and effectively reduces boiler exhaust gas heat loss, pressure fan, draws（Increase
Pressure）The work done of blower fan can also decline to a great extent, therefore, the economy of whole unit substantially can be lifted；
2) as the oxygen content of burner hearth is greatly reduced, the generation concentration of nitrogen oxides is also greatly reduced, and unit Environmental Protection Level is able to
Lifted；
3) be fed again into the partial fume of burner hearth, oxygen therein and unburned thing enter burner hearth after can second-time burning utilize, combustion
Burn also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, flue gas is alleviated to stove internal heating surface and follow-up
The abrasion of equipment in flue, extends the life-span of equipment.
The technique effect of the design, concrete structure and generation of the present invention is described further below with reference to accompanying drawing, with
It is fully understood from the purpose of the present invention, feature and effect.
Description of the drawings
Fig. 1 is the schematic diagram of a specific embodiment of the invention.
Fig. 2 is the schematic diagram of another specific embodiment of the invention.
Fig. 3 is the schematic diagram of another specific embodiment of the invention.
Fig. 4 is the schematic diagram of another specific embodiment of the invention.
Fig. 5 is the schematic diagram of another specific embodiment of the invention.
Fig. 6 is the schematic diagram of another specific embodiment of the invention.
Fig. 7 is the schematic diagram of another specific embodiment of the invention.
Fig. 8 is the schematic diagram of another specific embodiment of the invention.
Fig. 9 is the schematic diagram of another specific embodiment of the invention.
Figure 10 is the schematic diagram of another specific embodiment of the invention.
Figure 11 is the schematic diagram of another specific embodiment of the invention.
Figure 12 is the schematic diagram of another specific embodiment of the invention.
Figure 13 is the schematic diagram of another specific embodiment of the invention.
Figure 14 is the schematic diagram of another specific embodiment of the invention.
Figure 15 is the schematic diagram of another specific embodiment of the invention.
Figure 16 is the schematic diagram of another specific embodiment of the invention.
Figure 17 is the schematic diagram of another specific embodiment of the invention.
Figure 18 is the schematic diagram of another specific embodiment of the invention.
Labelling in figure：1st, boiler；2nd, hot secondary air bellow；3rd, furnace outlet position；4th, SCR reactors；5th, Yuan Youyan
Road；6th, air preheater；7th, cleaner unit；8th, circularly-supercharged blower fan；9th, gas baffle；10th, flue gas outlet port；11st, flue gas is accessed
Mouthful；12nd, increase flue newly.
Specific embodiment
Embodiment 1
Fig. 1 is a kind of flue gas recycling system of the invention and the embodiment 1 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.A kind of flue gas recycling system of the present invention at least includes boiler 1（Containing hot secondary air bellow 2）, circularly-supercharged blower fan 8,
Gas baffle 9, flue gas outlet port 10, flue gas access port 11, newly-increased flue 12.
The prior art of combustion efficiency is improved based on use so that boiler can be still kept full load burner hearth oxygen content is relatively low
On the premise of good combustion, the partial fume for further exporting denitrification apparatus SCR sends into heat by a circularly-supercharged blower fan
The entrance of secondary air bellow, and then hearth combustion region is sent into, as the flue gas that this part has uniform temperature is fed again into
Burner hearth, the cigarette that can improve convection heating surface are fast, and then guarantee the vapor (steam) temperature of unit, at the same time, the flue gas of feeding, although contain
Oxygen amount is relatively low, but due to using the existing technology for improving boiler combustion, for example, widening what extracted steam from turbine was utilized using a kind of
Method or a kind of adjustable feed water heat regenerative for Turbo-generator Set etc., are capable of achieving boiler and reach good burning
Effect.Also, the oxygen in this partial fume and unburned thing enter burner hearth after can second-time burning utilize, burning is filled also therefore more
Point, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviate mill of the flue gas to equipment in stove internal heating surface and follow-up flue
Damage, extend the life-span of equipment.Further, since the partial fume of SCR outlets nitrogen in denitration, the partial fume itself
Oxide concentration itself is relatively low, thus, burner hearth is re-fed into using the partial fume, the nitrous oxides concentration of whole flue gas can be made
Decline to a great extent.
Under unit different load operating mode, by control into the air output of burner hearth and using gas baffle come adjust into
Kiln gas amount, and then adjust burner hearth oxygen content and reheat steam temperature so that in the range of full load, both kept relatively low burner hearth
Oxygen content, keeps the unit main steam temperature and reheat steam temperature of normal level again, realizes that boiler full load low oxygen and low nitrogen fires
Burn.
By taking certain 1000MW extra-supercritical unit as an example, boiler design operation oxygen amount：It is 3.5 during 100% rate of load condensate, 30% load
Rate is 7.36；After full load low oxygen and low nitrogen combustion technology, boiler actual motion oxygen amount：30%～100% rate of load condensate is reachable
To 1.8.
After the method for the invention：On the one hand, boiler exhaust gas heat loss is further reduced, and boiler efficiency is lifted again,
Jing is converted, and therefore unit net coal consumption rate can decline about 1.27g/kWh.On the other hand, due to entering the same of stove air quantity and amount of flue gas emission
Step is reduced, and is made to send, is drawn, booster fan is exerted oneself and is remarkably decreased, then deducts newly-increased circularly-supercharged blower fan power consumption increment：Wherein, send
Blower fan lower power consumption 92.04KW, draws increasing blower fan lower power consumption 592.9KW, and circularly-supercharged blower fan power consumption is 109.2KW.By meter
Calculate and understand, the total power of fan of unit can be reduced：92.04+592.9-109.2=575.74（KW）, it is converted to net coal consumption rate reduction
0.159g/kwh。
In terms of two more than comprehensive, net coal consumption rate about 1.429 g/kwh altogether can be reduced after the project implementation, 4500 are run per year
Hour is calculated, and can save 6430 tons of coal of mark every year.
Embodiment 2
Fig. 2 is a kind of flue gas recycling system and realizes the schematic diagram of the embodiment 2 of boiler full load low oxygen and low nitrogen combustion method.
The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, full load burner hearth oxygen content compared with
It is low still can keep good combustion on the premise of, further by air preheater export partial fume, it is circularly-supercharged by one
Blower fan sends into the entrance of hot secondary air bellow, and then sends into hearth combustion region, and the oxygen and unburned thing in this partial fume enters
Enter after burner hearth can second-time burning utilize, also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and mitigate for burning
Abrasion of the flue gas to equipment in stove internal heating surface and follow-up flue, extends the life-span of equipment.
With embodiment 1, the present embodiment differs primarily in that flue gas outlet port is to be located at air preheater outlet, come relatively
Say, the flue-gas temperature of air preheater outlet is low, but also can pass through control completely into the air output and flue gas of burner hearth
Baffle plate adjusts exhaust gas volumn that this is partially into burner hearth to control final burner hearth oxygen content and unit vapor (steam) temperature.
Embodiment 3
Fig. 3 is a kind of flue gas recycling system of the invention and the embodiment 3 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load burner hearth
Oxygen content is relatively low still can keep good combustion on the premise of, further by the partial fume of house outlet, by one circulate
Booster fan sends into the entrance of hot secondary air bellow, and then sends into hearth combustion region, the oxygen and unburned in this partial fume
Thing enter burner hearth after can second-time burning utilize, also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced for burning,
Abrasion of the flue gas to equipment in stove internal heating surface and follow-up flue is alleviated, the life-span of equipment is extended.
With embodiment 1, the present embodiment differs primarily in that flue gas outlet port is to be located at house outlet, on the one hand, relative
For, the flue-gas temperature of house outlet is low, but this can pass through control completely into the air output and flue gas gear of burner hearth
Plate adjusts exhaust gas volumn that this is partially into burner hearth to control final burner hearth oxygen content and unit vapor (steam) temperature；On the other hand, remove
The flue gas of dirt device outlet is low due to dustiness, thus the relative life-span that can extend circularly-supercharged blower fan.
Embodiment 4
Fig. 4 is a kind of flue gas recycling system of the invention and the embodiment 4 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load burner hearth
Oxygen content is relatively low still can keep good combustion on the premise of, further by denitrification apparatus SCR export partial fume, by one
Circularly-supercharged blower fan sends into the bottom of burner hearth, and the oxygen and unburned thing in this partial fume can second-time burning profit after entering burner hearth
With, also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced for burning, alleviate flue gas to stove internal heating surface and
In follow-up flue, the abrasion of equipment, extends the life-span of equipment.
With embodiment 1, the present embodiment differs primarily in that flue gas access port is to be located at burner hearth bottom, in general, to existing
For some boilers, burner hearth bottom needs to set up an opening in addition again, to facilitate the access of flue gas.
Embodiment 5
Fig. 5 is a kind of flue gas recycling system of the invention and the embodiment example 5 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, further by air preheater export partial fume, by one
Individual circularly-supercharged blower fan sends into the bottom of burner hearth, and the oxygen and unburned thing in this partial fume can second-time burning profit after entering burner hearth
With, also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced for burning, alleviate flue gas to stove internal heating surface and
In follow-up flue, the abrasion of equipment, extends the life-span of equipment.
With embodiment 4, the present embodiment differs primarily in that flue gas exit is to be located at air preheater outlet, come relatively
Say, the flue-gas temperature of air preheater outlet is low, but this can pass through control completely into the air output and flue gas of burner hearth
Baffle plate adjusts exhaust gas volumn that this is partially into burner hearth to control final burner hearth oxygen content and reheat steam temperature.
Embodiment 6
Fig. 6 is a kind of flue gas recycling system of the invention and the embodiment 6 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load burner hearth
Oxygen content is relatively low still can keep good combustion on the premise of, further by the partial fume of house outlet, by one circulate
Booster fan send into burner hearth bottom, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, combustion
Burn also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, flue gas is alleviated to stove internal heating surface and follow-up
The abrasion of equipment in flue, extends the life-span of equipment.
With embodiment 4, the present embodiment differs primarily in that flue gas exit is to be located at house outlet, on the one hand, relative
For, the flue-gas temperature of house outlet is low, but this can pass through control completely into the air output and flue gas gear of burner hearth
Plate adjusts exhaust gas volumn that this is partially into burner hearth to control final burner hearth oxygen content and reheat steam temperature；On the other hand, remove
The flue gas of dirt device outlet is low due to dustiness, thus the relative life-span that can extend circularly-supercharged blower fan.
Embodiment 7
Fig. 7 is a kind of flue gas recycling system of the invention and the embodiment 7 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load burner hearth
Oxygen content is relatively low still can keep good combustion on the premise of, further by SCR export partial fume, it is circularly-supercharged by one
Blower fan send into furnace outlet at, the oxygen and unburned thing in this partial fume enter stove in can second-time burning utilize, burning also because
This is more abundant, and the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviates flue gas in stove internal heating surface and follow-up flue
The abrasion of equipment, extends the life-span of equipment.
With embodiment 1, the present embodiment differs primarily in that flue gas access port is located at furnace outlet, in general, right
For existing boiler, need to set up an opening in addition again at furnace outlet, to facilitate the access of flue gas.
Embodiment 8
Fig. 8 is a kind of flue gas recycling system of the invention and the embodiment 8 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load burner hearth
Oxygen content is relatively low still can keep good combustion on the premise of, further by air preheater export partial fume, by one
Circularly-supercharged blower fan is sent at furnace outlet, the oxygen and unburned thing in this partial fume enter in stove can second-time burning utilize,
Also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced for burning, alleviate flue gas to stove internal heating surface and after
The abrasion of equipment in continuous flue, extends the life-span of equipment.
With embodiment 7, the present embodiment differs primarily in that flue gas exit is to be located at air preheater outlet, come relatively
Say, the flue-gas temperature of air preheater outlet is low, but this can pass through control completely into the air output and flue gas of burner hearth
Baffle plate adjusts exhaust gas volumn that this is partially into burner hearth to control final burner hearth oxygen content and reheat steam temperature.
Embodiment 9
Fig. 9 is a kind of flue gas recycling system of the invention and the embodiment 9 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load burner hearth
Oxygen content is relatively low still can keep good combustion on the premise of, further by the partial fume of house outlet, by one circulate
Booster fan send into furnace outlet at, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, combustion
Burn also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, flue gas is alleviated to stove internal heating surface and follow-up
The abrasion of equipment in flue, extends the life-span of equipment.
With embodiment 7, the present embodiment differs primarily in that flue gas exit is to be located at house outlet, on the one hand, relative
For, the flue-gas temperature of house outlet is low, but this can pass through control completely into the air output and flue gas gear of burner hearth
Plate adjusts exhaust gas volumn that this is partially into burner hearth to control final burner hearth oxygen content and reheat steam temperature；On the other hand, remove
The flue gas of dirt device outlet is low due to dustiness, thus the relative life-span that can extend circularly-supercharged blower fan.
Embodiment 10
Figure 10 is a kind of flue gas recycling system of the invention and the embodiment 10 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1, but flue gas outlet port 10, gas baffle 9 are all two.Based on use
Improve the prior art of combustion efficiency, full load burner hearth oxygen content is relatively low still can keep good combustion on the premise of, further
The partial fume of the partial fume that SCR is exported and air preheater outlet mixes after extracting out, and mixed flue gas passes through one
Circularly-supercharged blower fan sends into hot secondary air bellow, and then sends into hearth combustion region, the oxygen and unburned thing in this partial fume
Into after burner hearth can second-time burning utilize, also therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and subtract for burning
Light abrasion of the flue gas to equipment in stove internal heating surface and follow-up flue, extends the life-span of equipment.
With embodiment 1-9, the present embodiment differs primarily in that flue gas outlet port has two, be respectively provided at SCR outlets and sky
Air preheater is exported, and comparatively, the flue-gas temperature of air preheater outlet is low, but this completely can be by controlling two cigarettes
The exhaust gas volumn and gas baffle that gas outlet port is extracted out adjusts into the exhaust gas volumn of burner hearth, flue-gas temperature to control final burner hearth
Oxygen content and reheat steam temperature.
Embodiment 11
Figure 11 is a kind of flue gas recycling system of the invention and the embodiment 11 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 10.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, further by air preheater export partial fume and cleaner unit
The partial fume of outlet mixes after extracting out, and mixed flue gas sends into hot secondary air bellow by a circularly-supercharged blower fan, enters
And send into hearth combustion region, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, burning
Therefore more fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviate flue gas to stove internal heating surface and follow-up flue
The abrasion of interior equipment, extends the life-span of equipment.
The present embodiment and embodiment 10 differ primarily in that flue gas outlet port has two, be respectively provided at house outlet and
Air preheater is exported, on the one hand, comparatively, and the flue-gas temperature of air preheater outlet and house outlet is low, but this
Completely can by the exhaust gas volumn that controls two flue gas outlet ports to extract out and gas baffle adjust exhaust gas volumn into burner hearth come
The final burner hearth oxygen content of control and reheat steam temperature, on the other hand, the flue gas of house outlet is low due to dustiness, thus
The relative life-span that can extend circularly-supercharged blower fan.
Embodiment 12
Figure 12 is a kind of flue gas recycling system of the invention and the embodiment 12 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 10.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, the partial fume that further SCR is exported and house outlet
Partial fume mixes after extracting out, and mixed flue gas sends into hot secondary air bellow by a circularly-supercharged blower fan, and then sends into
Hearth combustion region, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, burning is also therefore more
Plus fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviate flue gas to equipment in stove internal heating surface and follow-up flue
Abrasion, extend the life-span of equipment.
The present embodiment and embodiment 10 differ primarily in that flue gas outlet port has two, be respectively provided at house outlet and
SCR is exported, on the one hand, comparatively, the flue-gas temperature of house outlet is low, but this completely can be by controlling two flue gases
The exhaust gas volumn and gas baffle that outlet port is extracted out is adjusted into the exhaust gas volumn of burner hearth, flue-gas temperature
On the other hand oxygen amount and reheat steam temperature, the flue gas of house outlet is low due to dustiness, thus relative can extend circulation and increase
The life-span of pressure fan.
Embodiment 13
Figure 13 is a kind of flue gas recycling system of the invention and the embodiment 13 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 10.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, further by SCR export partial fume and air preheater go out
The partial fume of mouth mixes after extracting out, and mixed flue gas sends into burner hearth bottom, and then feeding by a circularly-supercharged blower fan
Hearth combustion region, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, burning is also therefore more
Plus fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviate flue gas to equipment in stove internal heating surface and follow-up flue
Abrasion, extend the life-span of equipment.
With embodiment 1-9, the present embodiment differs primarily in that flue gas outlet port has two, be respectively provided at SCR outlets and sky
Air preheater is exported, and comparatively, the flue-gas temperature of air preheater outlet is low, but this completely can be by controlling two cigarettes
The exhaust gas volumn and gas baffle that gas outlet port is extracted out adjusts into the exhaust gas volumn of burner hearth, flue-gas temperature to control final burner hearth
Oxygen content and reheat steam temperature.
Embodiment 14
Figure 14 is a kind of flue gas recycling system of the invention and the embodiment 14 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 10.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, further by air preheater export partial fume and cleaner unit
The partial fume of outlet mixes after extracting out, and mixed flue gas sends into burner hearth bottom by a circularly-supercharged blower fan, and then send
Enter hearth combustion region, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, burning also therefore
More fully, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviate flue gas to setting in stove internal heating surface and follow-up flue
Standby abrasion, extends the life-span of equipment.
The present embodiment and embodiment 13 differ primarily in that flue gas outlet port has two, be respectively provided at house outlet and
Air preheater is exported, on the one hand, comparatively, and the flue-gas temperature of air preheater outlet and house outlet is low, but this
Completely can by the exhaust gas volumn that controls two flue gas outlet ports to extract out and gas baffle adjust exhaust gas volumn into burner hearth come
The final burner hearth oxygen content of control and reheat steam temperature, on the other hand, the flue gas of house outlet is low due to dustiness, thus
The relative life-span that can extend circularly-supercharged blower fan.
Embodiment 15
Figure 15 is a kind of flue gas recycling system of the invention and the embodiment 15 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 10.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, the partial fume that further SCR is exported and house outlet
Partial fume mixes after extracting out, and mixed flue gas sends into burner hearth bottom by a circularly-supercharged blower fan, and then sends into burner hearth
Combustion zone, the oxygen and unburned thing in this partial fume enter burner hearth after can second-time burning utilize, burning is filled also therefore more
Point, the unburned carbon in flue dust of whole flue gas can be substantially reduced, and alleviate mill of the flue gas to equipment in stove internal heating surface and follow-up flue
Damage, extend the life-span of equipment.
The present embodiment and embodiment 13 differ primarily in that flue gas outlet port has two, be respectively provided at house outlet and
SCR is exported, on the one hand, comparatively, the flue-gas temperature of house outlet is low, but this completely can be by controlling two flue gases
The exhaust gas volumn and gas baffle that outlet port is extracted out is adjusted into the exhaust gas volumn of burner hearth, flue-gas temperature
On the other hand oxygen amount and reheat steam temperature, the flue gas of house outlet is low due to dustiness, thus relative can extend circulation and increase
The life-span of pressure fan.
Embodiment 16
Figure 16 is a kind of flue gas recycling system of the invention and the embodiment 16 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 10.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, further by SCR export partial fume and air preheater go out
The partial fume of mouth mixes after extracting out, and mixed flue gas is sent at furnace outlet by a circularly-supercharged blower fan, this part
Oxygen and unburned thing in flue gas enter in stove can second-time burning utilize, burning also therefore more fully, the flying dust of whole flue gas
Phosphorus content can be substantially reduced, and alleviate abrasion of the flue gas to equipment in stove internal heating surface and follow-up flue, extend the longevity of equipment
Life.
With embodiment 1-9, the present embodiment differs primarily in that flue gas outlet port has two, be respectively provided at SCR outlets and sky
Air preheater is exported, and comparatively, the flue-gas temperature of air preheater outlet is low, but this completely can be by controlling two cigarettes
The exhaust gas volumn and gas baffle that gas outlet port is extracted out adjusts into the exhaust gas volumn of burner hearth, flue-gas temperature to control final burner hearth
Oxygen content and reheat steam temperature.
Embodiment 17
Figure 17 is a kind of flue gas recycling system of the invention and the embodiment 17 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, further by air preheater export partial fume and cleaner unit
The partial fume of outlet mixes after extracting out, and mixed flue gas is sent at furnace outlet by a circularly-supercharged blower fan, this portion
Oxygen and unburned thing in point flue gas enter in stove can second-time burning utilize, also therefore more fully, whole flue gas flies for burning
Grey phosphorus content can be substantially reduced, and alleviate abrasion of the flue gas to equipment in stove internal heating surface and follow-up flue, extend equipment
Life-span.
The present embodiment and embodiment 16 differ primarily in that flue gas outlet port has two, be respectively provided at house outlet and
Air preheater is exported, on the one hand, comparatively, and the flue-gas temperature of air preheater outlet and house outlet is low, but this
Completely can by the exhaust gas volumn that controls two flue gas outlet ports to extract out and gas baffle adjust exhaust gas volumn into burner hearth come
The final burner hearth oxygen content of control and reheat steam temperature, on the other hand, the flue gas of house outlet is low due to dustiness, thus
The relative life-span that can extend circularly-supercharged blower fan.
Embodiment 18
Figure 18 is a kind of flue gas recycling system of the invention and the embodiment 18 for realizing boiler full load low oxygen and low nitrogen combustion method
Schematic diagram.The equipment that the system includes is with embodiment 1.The prior art of combustion efficiency is improved based on use, in full load stove
Thorax oxygen content is relatively low still can keep good combustion on the premise of, the partial fume that further SCR is exported and house outlet
Partial fume mixes after extracting out, and mixed flue gas is sent at furnace outlet by a circularly-supercharged blower fan, this partial fume
In oxygen and unburned thing enter in stove can second-time burning utilize, burning also therefore more fully, the flying marking of whole flue gas
Amount can be substantially reduced, and alleviate abrasion of the flue gas to equipment in stove internal heating surface and follow-up flue, extend the life-span of equipment.
The present embodiment and embodiment 16 differ primarily in that flue gas outlet port has two, be respectively provided at house outlet and
SCR is exported, on the one hand, comparatively, the flue-gas temperature of house outlet is low, but this completely can be by controlling two flue gases
The exhaust gas volumn and gas baffle that outlet port is extracted out is adjusted into the exhaust gas volumn of burner hearth, flue-gas temperature
On the other hand oxygen amount and reheat steam temperature, the flue gas of house outlet is low due to dustiness, thus relative can extend circulation and increase
The life-span of pressure fan.
It should be noted that, several specific embodiments of the present invention described in detail above.Extracted out according to boiler shape, flue gas
The system with various arrangement combination such as mouthful quantity and position, gas baffle quantity and position, flue gas access port quantity and position
Connected mode, it will be appreciated that it is contemplated that realizing boiler full load low oxygen and low nitrogen combustion method by providing one kind.This area
Those of ordinary skill without the need for creative work just can with it is of the invention design make many modifications and variations.Therefore, it is all
Technical staff is under this invention's idea on the basis of existing method by logical analyses, reasoning or limited in the art
The available technical scheme of experiment, all should be in the protection domain being defined in the patent claims.
Claims (14)
1. a kind of flue gas recycling system, the system at least include flue gas outlet port, gas baffle, circularly-supercharged blower fan, cigarette
Gas access port and connect the flue gas outlet port, the gas baffle, the circularly-supercharged blower fan, the flue gas access port
Newly-increased flue, it is characterised in that the gas baffle, the circularly-supercharged wind turbine layout in the newly-increased flue, the cigarette
Gas outlet port position is located on economizer exit or its follow-up flue, and the flue gas access port position is located at burner hearth bottom or burner hearth
Outlet or the entrance of hot secondary air bellow.
2. flue gas recycling system as claimed in claim 1, it is characterised in that the flue gas outlet port is, the cigarette
Gas baffle plate is one, and the flue gas access port is one.
3. flue gas recycling system as claimed in claim 1, it is characterised in that the flue gas outlet port is multiple, the cigarette
Gas baffle plate is multiple, and the flue gas access port is one.
4. flue gas recycling system as claimed in claim 1, it is characterised in that the flue gas outlet port is, the cigarette
Gas baffle plate is multiple, and the flue gas access port is multiple.
5. flue gas recycling system as claimed in claim 1, it is characterised in that the flue gas outlet port is, the cigarette
Gas baffle plate is one, and the flue gas access port is multiple.
6. flue gas recycling system as claimed in claim 1, it is characterised in that the flue gas outlet port is multiple, the cigarette
Gas baffle plate is multiple, and the flue gas access port is multiple.
7. flue gas recycling system as claimed in claim 1, it is characterised in that the circularly-supercharged blower fan at least one.
8. a kind of employing claim 1-7 it is arbitrary this flue gas recycling system realize boiler full load low oxygen and low nitrogen burning
Method, comprises the following steps：Step 1, for possess full load furnace outlet flue gas low oxygen content but still can good combustion
Boiler, partial fume is extracted out from flue gas outlet port by circularly-supercharged blower fan, and the flue gas of extraction flows through cigarette by increasing flue newly
Gas baffle plate is admitted to flue gas access port；Step 2, under different load operating mode, enters air output and the institute of burner hearth by control
State gas baffle and adjust the exhaust gas volumn for entering burner hearth, and then adjust the oxygen content and unit vapor (steam) temperature of burner hearth.
9. the method for realizing the burning of boiler full load low oxygen and low nitrogen as claimed in claim 8, it is characterised in that in step 1,
The flue gas outlet port is one, and the gas baffle is one, and the flue gas access port is one, by described in flue gas from
Extract out and a flue gas access port is sent into through a gas baffle, the circularly-supercharged blower fan in flue gas outlet port.
10. the method for realizing the burning of boiler full load low oxygen and low nitrogen as claimed in claim 8, it is characterised in that in step 1
In, for multiple, the gas baffle is multiple, and the flue gas access port is one for the flue gas outlet port, by flue gas from multiple
The flue gas outlet port is extracted out through multiple gas baffles, sends into a cigarette by the circularly-supercharged blower fan again after converging
Gas access port.
11. methods for realizing the burning of boiler full load low oxygen and low nitrogen as claimed in claim 8, it is characterised in that in step 1
In, the flue gas outlet port is one, and the gas baffle is multiple, and the flue gas access port is multiple, by flue gas from one
Through the circularly-supercharged blower fan after the flue gas outlet port extraction, multiple gas baffles, Ran Houfen after shunting, are entered back into
Multiple flue gas access ports are not sent into.
12. methods for realizing the burning of boiler full load low oxygen and low nitrogen as claimed in claim 8, it is characterised in that in step 1
In, the flue gas outlet port is one, and the gas baffle is one, and the flue gas access port is multiple, by flue gas from one
Through the gas baffle, the circularly-supercharged blower fan after the flue gas outlet port extraction, multiple cigarettes after shunting, are respectively fed to again
Gas access port.
13. methods for realizing the burning of boiler full load low oxygen and low nitrogen as claimed in claim 8, it is characterised in that in step 1
In, for multiple, the gas baffle is multiple, and the flue gas access port is multiple, by flue gas from multiple for the flue gas outlet port
The flue gas outlet port is extracted out after multiple gas baffles, by the circularly-supercharged blower fan, is then respectively fed to many
Individual flue gas access port.
14. methods for realizing the burning of boiler full load low oxygen and low nitrogen as claimed in claim 8, can close gas baffle to cut off
Flue gas recycling system enters the flue gas stream of boiler furnace.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611068850.0A CN106524135A (en) | 2016-11-29 | 2016-11-29 | Flue gas recycling system and method for achieving boiler full-load low-oxygen low-nitrogen combustion |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201611068850.0A CN106524135A (en) | 2016-11-29 | 2016-11-29 | Flue gas recycling system and method for achieving boiler full-load low-oxygen low-nitrogen combustion |
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| CN112113239A (en) * | 2020-09-11 | 2020-12-22 | 濮阳市盛源石油化工（集团）有限公司 | Low-nitrogen boiler for removing return air condensate water |
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