CN110287561A - One kind stopping standby burner low-temperature flue gas cooling system and its Parameters design - Google Patents
One kind stopping standby burner low-temperature flue gas cooling system and its Parameters design Download PDFInfo
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- CN110287561A CN110287561A CN201910514385.6A CN201910514385A CN110287561A CN 110287561 A CN110287561 A CN 110287561A CN 201910514385 A CN201910514385 A CN 201910514385A CN 110287561 A CN110287561 A CN 110287561A
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- flue gas
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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
- F23L9/00—Passages or apertures for delivering secondary air for completing combustion of fuel
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/10—Geometric CAD
- G06F30/17—Mechanical parametric or variational design
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
Abstract
The present invention discloses one kind and stops standby burner low-temperature flue gas cooling system and its Parameters design, low-temperature flue gas is exported by boiler induced-draft fan and is drawn, successively through main pipe, branch's main pipe, it is in charge of and the tuyere and secondary tuyere that stop standby burner is cooled down respectively with branch pipe, one kind provided by the invention stops standby burner low-temperature flue gas cooling system and its Parameters design, stop standby burner using boiler induced-draft fan low exit temperature flue gas is cooling, it is big can to solve the cooling caused cooling air quantity demand of air, boiler ash combustible increases, furnace outlet NOx concentration increases, exhaust gas temperature increases, blower power consumption is high, the problems such as easy scaling loss of tuyere.
Description
Technical field:
The present invention relates to one kind to stop standby burner low-temperature flue gas cooling system and its Parameters design.
Background technique:
Large-sized station boiler burner number of elements and the number of plies press BMCR operating condition design, and actual motion load is lower than BMCR work more
Condition evaporation capacity, if therefore fuel design coal, actual motion always have partial combustion burner be in stop, standby state.In recent years, due to producing
Adjustment of agricultural stracture and new energy engineering largely build up power generation, and fired power generating unit annual utilization hours are greatly reduced, and part of generating units is even
Less than 2000 hours, for considerable part unit load rate less than 60%, depth peak regulation was even less than 30%.Therefore boiler stops standby burning
Device number of elements greatly increases.To prevent from stopping standby burner scaling loss, it is necessary to be aerated cooling to first and second tuyere.Boiler stops at present
Standby burner designs the type of cooling are as follows: and secondary tuyere (containing surrounding air, centre wind, burnt wind) is cooling using secondary air box hot wind,
Tuyere utilizes the big valve of primary air piping or coal pulverizer import cold front heavy rain before burner.To prevent from stopping standby burner scaling loss,
From design aspect, manufactory requires secondary air register to close the flow area that limit still has 5% or so entirely, and it is air-cooled to stop standby burner circumference
But air quantity is 5% or so of design air flow, other Secondary Air cooling air quantities are 10% or so of design air flow.Field observation, respectively
Factory stops standby burner secondary air register aperture mostly in 15%~25% range.The control of cooling air quantity is according to the wall temperature for stopping standby burner
Adjustment, different burner materials, control wall temperature is different, and wall temperature setting value is provided by burner manufactory.
Existing to stop standby first and second tuyere of burner using air cooling, since its air quantity (wind speed) is low, momentum is insufficient,
Cooling wind is difficult to penetrate burner hearth flue gas and enters in the middle part of burner hearth, is sufficiently mixed and burned with coal dust, in addition cooling wind and operation burner
Distance is farther out, it is difficult to the initiation combustion of coal dust is participated in, this part cooling wind has the attribute of inorganization air quantity in a degree, if
Boiler operatiopn oxygen amount does not improve, and Boiler Ash, slag combustible can increase, and to avoid ash, slag combustible from increasing, operation oxygen amount is necessary
Increase, furnace outlet flue gas NOx concentration can increase.In addition main burning area stops accounting for total blast volume certain proportion for burner cooling wind,
Necessarily cause burnt wind ratio to decline, also results in the raising of furnace outlet flue gas NOx concentration.NOx concentration lift-off value and boiler-type
Formula, coal and stop that standby burner number of elements is related, and range is mostly in 15mg/Nm3~85mg/Nm3。
It is existing to stop standby burner secondary tuyere and cooled down using secondary air box hot wind, wind-warm syndrome mostly at 290 DEG C~360 DEG C, with
Cryogenic media cooling is compared, and cooling effect is poor, not exceeded to guarantee to stop standby burner wall temperature, and the cooling air quantity of investment increases, into
One step aggravates ash combustibles, furnace outlet flue gas NOx concentration increases, and in addition blower power consumption also will increase.
It is existing that stop standby tuyere of burner cold using the big valve of primary air piping before burner or coal pulverizer import cold wind
But, this part cold blast rate is directly entered burner hearth without air preheater, reduces air preheater cooling effect, causes to arrange
Smoke temperature degree increases, and lifting range is decided by stop standby burner number of elements and cooling air quantity size, mostly at 2 DEG C~4 DEG C.
The big valve type of cooling of primary air piping before existing burner, it is empty since atmosphere air door import setting is compared with fie screen
Gas floating material easily blocks strainer, and strainer is monitored without differential pressure, if burner easily leads to burner scaling loss again without wall temperature measurement point.
Summary of the invention:
In order to solve the above technical problems, the present invention provides, one kind stopping standby burner low-temperature flue gas cooling system and its parameter is set
Meter method, the technical solution adopted by the present invention are as follows:
One kind stopping standby burner low-temperature flue gas cooling system, and low-temperature flue gas is exported by boiler induced-draft fan and drawn, successively through mother
Pipe, branch's main pipe are in charge of and are cooled down respectively to the tuyere and secondary tuyere that stop standby burner with branch pipe.
Preferably, cooling wind pipeline or one of the low-temperature flue gas after part branch pipe is connected to the atmosphere cooling air flap an of tuyere
Primary air piping before secondary wind combustor, it is blunt but for First air；Another part branch pipe passes through hot bellows, is connected to each Secondary Air of burner
Air compartment after plate washer, cools down secondary tuyere.
Preferably, the low-temperature flue gas is drawn through two boiler induced-draft fan outlets respectively, is imported through parallel two-way main pipe
Main pipe all the way, each main pipe are identical caliber；It wherein is equipped with electric isolating valve in parallel two-way main pipe, is used for isolation of system；
Two-way is arranged in branch's main pipe, and face-fired boiler is distributed in front of and after boiler, and tangentially firing boiler is distributed in boiler or so, and branch is female
Pipe is connect with main pipe and being in charge of；Every is stopped standby burner setting and is in charge of all the way, is in charge of and is connect with branch's main pipe and branch pipe, each branch pipe
Access each cooling duct of each burner.
Preferably, it is all provided with electric isolating valve on each branch pipe, is used for isolation of system；Electronic pitch is also set on each branch pipe respectively,
For adjusting cooled flue gas amount.
Preferably for face-fired boiler, the branch pipe of cooling First air turbulent burner is at most equipped with four tunnels, connects respectively
Air hose to centre wind isolating door, primary air piping before pipeline or First air turbulent burner after atmosphere cooling air flap, inside and outside two
Air compartment after secondary windband cylinder air door；The cooling branch pipe for burning wind combustor is equipped with all the way, is connected to the air compartment of burnt wind behind the door；Its
In, connecting inside and outside Secondary Air sleeve wind, air compartment and burnt wind are respectively equipped with expansion joint on the branch section of air compartment behind the door behind the door；
For tangentially firing boiler, the branch pipe of a cooling wind combustor is at most equipped with two-way, manages after being respectively connected to atmosphere cooling air flap
The air compartment after primary air piping and surrounding air air door before road or a wind combustor, cooling secondary wind combustor and burnt wind burning
Device is respectively provided with branch pipe all the way, is respectively connected to the air compartment of Secondary Air and burnt wind behind the door, and on the branch section of connection air compartment respectively
Equipped with expansion joint.
Above-mentioned to stop standby burner low-temperature flue gas cooling system, Parameters design comprises the following specific steps that:
1) main pipe, branch's main pipe are calculated as follows, are in charge of and cooled flue gas amount in branch pipe:
1.1) cooled flue gas amount in each cooling duct is calculated as follows:
Wherein: Qi zgyFor the i-th cooling duct cooled flue gas amount, i ∈ [1, N]；N is total to stop cooling duct in standby burner
Number；
Qi rkFor the cooling quantity of hot air in the i-th cooling duct, kg/h；
Qi LkFor the i-th cooling duct cooling of the atmosphere air capacity, kg/h；
ti" rkTemperature when burner is left for the cooling hot-air in the i-th cooling duct, DEG C；
ti′ rkHot air temperature is cooled down for the i-th cooling duct, DEG C；
ti" LkTemperature when burner is left for the i-th cooling duct atmospheric air, DEG C；
tLkFor the i-th cooling duct ambient air temp, DEG C；
Ci rkFor (ti" rk+ti′ rkAverage air specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
Ci LkFor (ti" Lk+tLkAverage air specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
ti" yTemperature when burner is left for the i-th cooling duct low-temperature flue gas, DEG C；
tyFor the i-th cooling duct low-temperature flue gas temperature, DEG C；
Ci yFor (ti" y+tyAverage flue gas specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
1.2) it is calculated as follows and is respectively in charge of middle cooled flue gas amount:
Qj fgy=∑ Qi zgy (2)
Wherein: Qj fgyIt is in charge of middle cooled flue gas amount, kg/h for jth road, j ∈ [1, M], M are to be in charge of sum；
1.3) cooled flue gas amount in each branch's main pipe is calculated as follows:
Qk fzmgy=∑ Qj fgy (3)
Wherein: Qk fzmgyFor cooled flue gas amount in kLu branch main pipe, kg/h, K ∈ [1,2]；
1.4) cooled flue gas amount in main pipe is calculated as follows:
Qmgy=∑ Qk fzmgy (4)
Wherein: QmgyFor cooled flue gas amount, kg/h in main pipe；
2) the conveying pressure difference of each series connection flue gas cooling duct, i.e., the delivery pressure of each branch pipe series connection piping is calculated as follows
Difference:
ΔPi ss=Py-ΔPi rs-Prc (5)
Wherein: Δ Pi ssFor the conveying pressure difference of the i-th road branch pipe series connection piping, kPa；PyFor air-introduced machine exiting flue gas meter pressure
Value, kPa；ΔPi rsFor the i-th road branch pipe series connection piping burner design resistance, kPa；PrcFor burner outlet gauge pressure values, kPa；
Wherein, the i-th road branch pipe series connection piping be the i-th road branch pipe and communicate therewith be in charge of, branch's main pipe and main pipe；
3) main pipe, each branch's main pipe are calculated as follows, are respectively in charge of and each branch pipe diameter:
3.1) each branch pipe diameter is calculated as follows:
di zgy=18.8* [Qi zgy/(Wy*ρy)]0.5 (6)
Wherein: di zgyFor the i-th tunnel branch pipe diameter, mm；Qi zgyFor the i-th road branch pipe flue gas mass flow；ρyFor cooled flue gas system
The average smoke density of system, kg/m3；WyFor cooled flue gas system flue gas flow rate, m/s；
3.2) it is calculated as follows and is respectively in charge of diameter:
dj fgy=18.8* [Qj fgy/(Wy*ρy)]0.5 (7)
Wherein: dj fgyIt is in charge of diameter, mm for jth road；Qj fgyIt is in charge of flue gas mass flow for jth road；
3.3) each branch's main pipe diameter is calculated as follows:
dk fzmgy=18.8* [Qk fzmgy/(Wy*ρy)]0.5 (8)
Wherein: dk fzmgyFor kLu branch main pipe diameter, mm；Qk fzmgyFor kLu branch main pipe flue gas mass flow；
3.4) main pipe diameter is calculated as follows:
dmgy=18.8* [Qmgy/(Wy*ρy)]0.5 (9)
Wherein: dmgyFor main pipe diameter, mm；QmgyFor main pipe mass flow；
4) be calculated as follows the cooled flue gas resistance of ducting and:
Wherein: Δ Pi yFor the resistance and kPa of the i-th road branch pipe series connection piping；
λmg、Respectively main pipe, kLu branch main pipe, jth road are in charge of, the i-th road branch pipe is hindered along journey
Force coefficient；
Lmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the length of the i-th road branch pipe, m；
dmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the diameter of the i-th road branch pipe, m；
ζmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the i-th road branch pipe local resistance
Coefficient；
5) resistance and middle maximum value Δ P of the calculated i-th road branch pipe series connection piping of step 4 are takeni y(max)If Δ Pi y(max)>
ΔPi ss, then need to reselect each tunnel gas flow velocity Wy, then bring step 3 and step 4 into, recalculate each pipe diameter with
And Δ Pi y, until Δ Pi y(max)<ΔPi ss, flue gas flow rate is best flue gas flow rate at this time, by each pipeline under best flue gas flow rate
Diameter design cooling system.
Compared with prior art, the present invention has the following advantages:
It is provided by the invention to stop replacing air to be cooled down using low-temperature flue gas for burner low-temperature flue gas cooling system, it is low
Warm flue gas specific heat capacity and air specific heat capacity difference are little, and low-temperature flue gas temperature is much lower compared with air, therefore flue gas cooling has more
There is superiority.
It is provided by the invention to stop standby burner low-temperature flue gas cooling system in boiler excess air coefficient (boiler operatiopn oxygen
Amount) it is constant in the case where can reduce cooling air to Boiler Ash, the raised influence of slag combustible.
Furnace provided by the invention caused by stopping the avoidable cooling air volume because of increase of standby burner low-temperature flue gas cooling system
Thorax exit NOx concentration increases, and reduces denitration ammonia spraying amount and denitration pressure.
It is provided by the invention to stop can reduce for burner low-temperature flue gas cooling system because First air mouth cooling wind is without air
Exhaust gas temperature caused by preheater increases problem, improves boiler operating efficiency.
It is provided by the invention to stop the avoidable First air mouth cooling of the atmosphere door entrance filter of standby burner low-temperature flue gas cooling system
The burner scaling loss that net blocking may cause.
It is provided by the invention to stop standby burner low-temperature flue gas cooling system in boiler excess air coefficient (boiler operatiopn oxygen
Amount) it is constant in the case where, boiler master, reheat steam temperature can be improved.The general Stream temperature rated value of boiler design guarantees that range is 35%
~100%BMCR, reheat steam temperature rated value guarantee that range is 50%~100%BMCR, according to the actual operation, 70% or more
Boiler, unit load be lower than 60%, main reheat steam temperature begin to it is relatively low, some boilers due to design and coal problem, even if
It is rated load, main reheat steam temperature is also relatively low.Especially recent years, unit load rate increasingly reduce, partial region unit
Rate of load condensate is less than 60%, or even close to 30%, steam temperature it is difficult to ensure that, seriously affect unit safety, economical operation.Of the invention stops
Standby burner low-temperature flue gas cooling system, exactly running on the lower load use, and since low-temperature flue gas enters burner hearth, cause burner hearth temperature
Degree decline, radiation of burner hearth heat absorption are reduced, and low-temperature flue gas recycles in furnace, increase exhaust gas volumn, and convection current heat absorption ratio increases, therefore
Main, reheat steam temperature can be significantly improved, if desired, or even low-temperature flue gas amount (beyond cooling requirement) can be increased to improve steam temperature.This
The standby burner low-temperature flue gas cooling system that stops of invention can be used for unit ultra-low load flexibility transformation, and it is cold that realization stops standby burner
But dual function is promoted with master, reheat steam temperature.
Provided by the invention to stop standby burner low-temperature flue gas cooling system, the low-temperature flue gas of use enters burner hearth, causes furnace
Bore temperature decline, prevents boiler coke to a certain extent, shielded wall temperature overtemperature.
Detailed description of the invention:
Fig. 1 is the face-fired boiler cooling system schematic diagram in embodiment；
Fig. 2 is the tangentially firing boiler cooling system schematic diagram in embodiment；
In figure: 1 is A, B boiler induced-draft fan；2 be main pipe；3 be main pipe electric isolating valve；4 be branch's main pipe；5 be to be in charge of；6
For branch pipe；7 be branch pipe electric isolating valve；8 be the electronic pitch of branch pipe；9 be center wind isolating door；10 First air mouth cooling of the atmospheres
Door；11 be the First air turbulent burner of face-fired boiler；12 burn wind combustor for face-fired boiler；13 be interior two
Secondary windband cylinder air door；14 be outer second air sleeve air door；15 burn air door for face-fired boiler；16 be branch pipe expansion joint；
17 be a wind combustor of tangentially firing boiler；18 for tangential boiler Secondary Air and burn wind combustor；19 be Secondary Air
With burn air door；20 be surrounding air air door.
Specific embodiment
With reference to the accompanying drawing and embodiment the present invention is further described:
Embodiment one:
The present embodiment stops standby burner low-temperature flue gas cooling system to face-fired boiler using one kind provided by the invention
The tuyere and secondary tuyere for stopping standby burner are cooled down, as shown in Figure 1, the cooling system includes A, B boiler draft
Machine 1, branch's main pipe 4, is in charge of 5 and branch pipe 6 at main pipe 2；
Low-temperature flue gas is drawn from A, B boiler induced-draft fan exhaust pass aperture respectively, and aperture nominal diameter is 2 internal diameter of main pipe,
Parallel two-way main pipe is welded, main pipe 2 all the way are then imported, each main pipe 2 is the identical pipeline of internal diameter；Wherein parallel two-way main pipe
On be equipped with main pipe electric isolating valve 3, be used for isolation of system.A, air feed avoids single boiler draft to B boiler induced-draft fan 1 simultaneously
The case where machine failure causes system to be unable to operate normally, this is designed as cooling system and provides enough exhaust gas volumns；2 other end of main pipe point
Before and after two-way branch main pipe 4 to face-fired boiler；It is in charge of 5 (if only one cooling duct of burner, the road Ze Zhe in each road
It is in charge of as branch pipe, such as burns wind combustor 12) it is drawn from branch's main pipe 4, it is arranged into before respectively stopping standby burner；Respectively stop standby burning
Device branch pipe 6 is in charge of 5 extractions from each correspondence.Respectively stop after being connected to centre wind isolating door 9 for 11 1 road branch pipe 6 of First air turbulent burner
On air hose, for cooling down centre wind secondary tuyere, branch pipe 6 is connected to after a tuyere atmosphere cooling air flap 10 on air hose or one all the way
Before secondary wind turbulent burner 11 on primary air piping, for cooling down a tuyere, remaining two-way branch pipe 6 is coupled with inside and outside secondary
On air compartment after windband cylinder air door 13,14, for cooling down secondary tuyere；Respectively stop the standby each branch pipe all the way of wind combustor 12 that burns (to divide
Pipe 5 is both branch pipe 6) it is connected on the air compartment after burning air door 15, tuyere is burnt for cooling.
It is all provided with branch pipe electric isolating valve 7 on each branch pipe 6, is used for isolation of system；Branch pipe electric adjustable is also set respectively on each branch pipe 6
Door 8, for adjusting cooled flue gas amount.Specific regulative mode be the burner highest provided according to manufactory allow wall temperature range into
Row closed loop is adjusted, and controls wall temperature within the scope of permission wall temperature by adjusting cooling low-temperature flue gas amount.Due to Secondary Air the temperature inside the box
It is higher, for avoid bellows, burner bear expansion or shrinkage active force and deform displacement etc., each branch pipe 6 passes through Secondary Air case portion
Point, that is, connecting inside and outside Secondary Air sleeve wind, that branch pipe is respectively set on the branch section of air compartment behind the door is swollen for air compartment and burnt wind behind the door
Swollen section 16.
Carbon steel pipe can be used in all pipelines of the present embodiment, since cooled flue gas pipe surface temperature is generally higher than 100 DEG C,
Therefore all cooled flue gas pipe insulations.According to site specific, necessary pipeline support and hanging are considered.
The present invention, which is exported for cooling low-temperature flue gas from boiler induced-draft fan, to be drawn by branch's main pipe 4 by main pipe 2, is in charge of
5 and branch pipe 6 be sent into the cooling duct for stopping standby burner a tuyere and secondary tuyere, realize to stopping the cold of standby each nozzle of burner
But.Wherein, it is provided for cooling low-temperature flue gas via boiler induced-draft fan, the air outlet gauge pressure of boiler induced-draft fan generally exists
1.5kPa~3.5kPa, and burner outlet negative pressure is generally in -50Pa, therefore pressure difference meets cooled flue gas conveying and requires, and is not necessarily to
Increase booster fan.
Using it is provided by the invention stop standby burner low-temperature flue gas cooling system after, stopping standby burner original cooling system can not
It removes, it is only necessary to it is out of service, as spare.
Embodiment two:
The present embodiment stops standby burner low-temperature flue gas cooling system to tangentially firing boiler using one kind provided by the invention
Stop standby burner a tuyere and secondary tuyere cooled down, as shown in Fig. 2, the cooling system includes that A, B boiler draw
Blower 1, branch's main pipe 4, is in charge of 5 and branch pipe 6 at main pipe 2；
Low-temperature flue gas is drawn from A, B boiler induced-draft fan exhaust pass aperture respectively, and aperture nominal diameter is 2 internal diameter of main pipe,
Parallel two-way main pipe 2 is welded, main pipe 2 all the way are then imported, each main pipe 2 is the identical pipeline of internal diameter；Wherein parallel two-way is female
It is equipped with main pipe electric isolating valve 3 on pipe 2, is used for isolation of system.A, air feed avoids single boiler to B boiler induced-draft fan 1 simultaneously
The case where air-introduced machine failure causes system to be unable to operate normally, this is designed as cooling system and provides enough exhaust gas volumns；Main pipe 2 is another
Duan Fen two-way branch main pipe 4 to tangentially firing boiler left and right sides；It is in charge of 5 (if burner only one cooling is logical in each road
Road, Ze Zhe are in charge of on road as branch pipe, such as Secondary Air and burn wind combustor 18) drawn from branch's main pipe 4, be arranged into and respectively stop standby combustion
Before burner；Respectively stop standby burner branch pipe 6 and is in charge of 5 extractions from each correspondence.Respectively stop a standby 17 1 road branch pipe 6 of wind combustor and is connected to week
On air compartment after boundary's wind air door 20, for cooling down circumference tuyere.Branch pipe 6 is connected to wind after a tuyere atmosphere cooling air flap 10 all the way
On pipe or before a wind combustor 17 on primary air piping, for cooling down a tuyere.Respectively stop standby Secondary Air and burns wind combustor
18 each branch pipes 6 all the way (being in charge of 5 both is branch pipe 6) are connected on the air compartment after secondary air register and burnt wind air door 19, are used for Secondary Air
Mouth and burnt wind are blunt but.
It is all provided with branch pipe electric isolating valve 7 on each branch pipe 6, is used for isolation of system；Branch pipe electric adjustable is also set respectively on each branch pipe 6
Door 8, for adjusting cooled flue gas amount.Specific regulative mode be the burner highest provided according to manufactory allow wall temperature range into
Row closed loop is adjusted, and controls wall temperature within the scope of permission wall temperature by adjusting cooling low-temperature flue gas amount.Due to Secondary Air the temperature inside the box
It is higher, for avoid bellows, burner bear expansion or shrinkage active force and deform displacement etc., each branch pipe 6 passes through Secondary Air case portion
Point, i.e., branch tube swelling is respectively provided on the branch section of the air compartment of air compartment, Secondary Air and the burnt wind after connection surrounding air air door behind the door
Section 16.
Carbon steel pipe can be used in all pipelines of the present embodiment, since cooled flue gas pipe surface temperature is generally higher than 100 DEG C,
Therefore all cooled flue gas pipe insulations.According to site specific, necessary pipeline support and hanging are considered.
The present invention, which is exported for cooling low-temperature flue gas from boiler induced-draft fan, to be drawn by branch's main pipe 4 by main pipe 2, is in charge of
5 and branch pipe 6 be sent into the cooling duct for stopping standby burner a tuyere and secondary tuyere, realize to stopping the cold of standby each nozzle of burner
But.Wherein, it is provided for cooling low-temperature flue gas via boiler induced-draft fan, the air outlet gauge pressure of boiler induced-draft fan generally exists
1.5kPa~3.5kPa, and burner outlet negative pressure is generally in -50Pa, therefore pressure difference meets cooled flue gas conveying and requires, and is not necessarily to
Increase booster fan.
Using it is provided by the invention stop standby burner low-temperature flue gas cooling system after, stopping standby burner original cooling system can not
It removes, it is only necessary to it is out of service, as spare
Embodiment three:
The present embodiment stops standby burner low-temperature flue gas cooling system, parameter using one kind of embodiment one or embodiment two
Design method comprises the following specific steps that:
1) main pipe, branch's main pipe are calculated as follows, are in charge of and cooled flue gas amount in branch pipe:
1.1) cooled flue gas amount in each cooling duct is calculated as follows:
Wherein: Qi zgyCooled flue gas amount, kg/h, i ∈ [1, N] are calculated for the i-th cooling duct；N is to stop in standby burner always
Cooling duct number, (the i-th cooling duct cooled flue gas amount is cooled flue gas amount in the i-th branch pipe connected to it), wherein
For face-fired boiler, the cooling duct number of every First air turbulent burner is up to 4, every burnt wind combustion
The cooling duct number of burner is 1；2 is up to for the cooling duct number of wind combustor of tangentially firing boiler, Secondary Air and
The cooling duct number for burning wind combustor is respectively 1.
Qi rkFor the cooling quantity of hot air in the i-th cooling duct, kg/h, manufactory is provided；
Qi LkFor the i-th cooling duct cooling of the atmosphere air capacity, kg/h, manufactory is provided；
ti" rkTemperature when burner is left for the cooling hot-air in the i-th cooling duct, DEG C, manufactory provides；
ti′ rkHot air temperature is cooled down for the i-th cooling duct, DEG C, manufactory provides；
ti" LkTemperature when burner is left for the i-th cooling duct atmospheric air, DEG C, manufactory provides；
tLkFor the i-th cooling duct ambient air temp, DEG C, manufactory provides；
Ci rkFor (ti" rk+ti′ rkAverage air specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
Ci LkFor (ti" Lk+tLkAverage air specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
ti" yTemperature when burner is left for the i-th cooling duct low-temperature flue gas, DEG C；
tyFor the i-th cooling duct low-temperature flue gas temperature, DEG C, take air-introduced machine exit gas temperature year to survey peak；
Ci yFor (ti" y+tyAverage flue gas specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
1.2) it is calculated as follows and is respectively in charge of middle cooled flue gas amount:
Qj fgy=∑ Qi zgy (2)
Wherein: Qj fgyIt is in charge of middle cooled flue gas amount, kg/h for jth road, j ∈ [1, M], M are to be in charge of sum；Every is stopped standby combustion
Burner corresponding 1 is in charge of, and is in charge of number and is depended on stopping standby burner number of elements；
1.3) cooled flue gas amount in each branch's main pipe is calculated as follows:
Qk fzmgy=∑ Qj fgy (3)
Wherein: Qk fzmgyFor cooled flue gas amount in kLu branch main pipe, kg/h, K ∈ [1,2]；
1.4) cooled flue gas amount in main pipe is calculated as follows:
Qmgy=∑ Qk fzmgy (4)
Wherein: QmgyFor cooled flue gas amount, kg/h in main pipe；
2) the conveying pressure difference of each series connection flue gas cooling duct is calculated as follows:
ΔPi ss=Py-ΔPi rs-Prc (5)
Wherein: Δ Pi ssFor the conveying pressure difference of the i-th road branch pipe series connection piping, kPa；PyFor air-introduced machine exiting flue gas meter pressure,
kPa；ΔPi rsFor the i-th series connection cooled flue gas channel burner design resistance, kPa is provided by manufactory；PrcFor burner outlet
Meter pressure, kPa, P in the present embodimentrcTake 0；Wherein, the i-th road branch pipe series connection piping be the i-th road branch pipe and communicate therewith be in charge of,
Branch's main pipe and main pipe；PyRelated with unit load, calculating takes the minimum possible load corresponding pressure of unit；
3) main pipe, each branch's main pipe are calculated as follows, are respectively in charge of and each branch pipe diameter (internal diameter):
3.1) each branch pipe diameter is calculated as follows:
di zgy=18.8* [Qi zgy/(Wy*ρy)]0.5 (6)
Wherein: di zgyFor the i-th tunnel branch pipe diameter, mm；Qi zgyFor the i-th road branch pipe flue gas mass flow, kg/h；ρyFor cooling
Flue gas system is averaged smoke density, kg/m3；WyFor cooled flue gas system flue gas flow rate, m/s chooses according to DL/T5121, each to manage
Road can use identical flow velocity；Wherein, ρy=(Py+2Pdq)*273*ρ0/[2*P0*(ty+273)]。PdqFor local average atmospheric pressure,
kPa。ρ0For flue gas standard state density, kg/m3。P0For normal atmospheric pressure, kPa.
3.2) it is calculated as follows and is respectively in charge of diameter:
dj fgy=18.8* [Qj fgy/(Wy*ρy)]0.5 (7)
Wherein: dj fgyIt is in charge of diameter, mm for jth road；Qj fgyIt is in charge of flue gas mass flow, kg/h for jth road；
3.3) each branch's main pipe diameter is calculated as follows:
dk fzmgy=18.8* [Qk fzmgy/(Wy*ρy)]0.5 (8)
Wherein: dk fzmgyFor kLu branch main pipe diameter, mm；Qk fzmgyFor kLu branch main pipe flue gas mass flow, kg/
h；
3.4) main pipe diameter is calculated as follows:
dmgy=18.8* [Qmgy/(Wy*ρy)]0.5 (9)
Wherein: dmgyFor main pipe diameter, mm；QmgyFor main pipe mass flow, kg/h；
4) be calculated as follows the cooled flue gas resistance of ducting and:
Wherein: Δ Pi yFor the resistance and kPa of the i-th road branch pipe series connection piping；
λmg、Respectively main pipe, kLu branch main pipe, jth road are in charge of, the i-th road branch pipe is hindered along journey
Force coefficient；
Lmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the length of the i-th road branch pipe, m；
dmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the diameter of the i-th road branch pipe, m；
ζmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the i-th road branch pipe local resistance
Coefficient (coefficient of partial resistance is on each pipeline because of resistance coefficient caused by valve, elbow, expansion joint, threeway, changes of section etc.).
5) resistance and middle maximum value Δ P of the calculated i-th road branch pipe series connection piping of step 4 are takeni y(max)If Δ Pi y(max)>
ΔPi ss, then need to reselect each tunnel gas flow velocity Wy, then bring step 3 and step 4 into, recalculate each pipe diameter with
And Δ Pi y, until Δ Pi y(max)<ΔPi ss, using flue gas flow rate at this time as best flue gas flow rate, and carry out setting for cooling system
Meter.If (when thering is underload to improve master, reheat steam temperature requirement, can be added according to temperature raising amplitude requirement by thermodynamic computing determination cold
But exhaust gas volumn)
One kind provided by the invention stops standby burner low-temperature flue gas cooling system, using boiler induced-draft fan low exit temperature flue gas
It is cooling to stop standby burner, can solve air it is cooling caused by cooling air quantity demand is big, boiler ash combustible increases, furnace outlet
The problems such as NOx concentration raising, exhaust gas temperature raising, blower power consumption height, an easy scaling loss of tuyere.
Claims (6)
1. one kind stops standby burner low-temperature flue gas cooling system, it is characterised in that: low-temperature flue gas is exported by boiler induced-draft fan and is drawn,
Successively through main pipe, branch's main pipe, be in charge of the tuyere and secondary tuyere that stop standby burner cooled down respectively with branch pipe.
2. according to claim 1 stop standby burner low-temperature flue gas cooling system, it is characterised in that: low-temperature flue gas is through part
Branch pipe is connected to cooling wind pipeline or the previous secondary air hose of a wind combustor after the atmosphere cooling air flap an of tuyere, for primary
Tuyere is cooling；Another part branch pipe passes through hot bellows, and the air compartment after being connected to each Secondary Air plate washer of burner carries out secondary tuyere cold
But.
3. according to claim 2 stop standby burner low-temperature flue gas cooling system, it is characterised in that: the low-temperature flue gas point
It is not drawn through two boiler induced-draft fan outlets, imports main pipe all the way through parallel two-way main pipe, each main pipe is identical caliber；Wherein
It is equipped with electric isolating valve in parallel two-way main pipe, is used for isolation of system；Two-way, face-fired boiler point is arranged in branch's main pipe
Before and after being distributed in boiler, tangentially firing boiler is distributed in boiler or so, and branch's main pipe and main pipe and being in charge of is connect；Every is stopped standby burning
Device setting is in charge of all the way, is in charge of and connect with branch's main pipe and branch pipe, and each branch pipe accesses each each cooling duct of burner.
4. according to claim 3 stop standby burner low-temperature flue gas cooling system, it is characterised in that: be all provided with electricity on each branch pipe
Dynamic isolating door, is used for isolation of system；Electronic pitch is also set on each branch pipe respectively, for adjusting cooled flue gas amount.
5. according to claim 1 to 4 stop standby burner low-temperature flue gas cooling system, it is characterised in that:
For face-fired boiler, the branch pipe of cooling First air turbulent burner is at most equipped with four tunnels, be respectively connected to centre wind every
From air hose behind the door, primary air piping, inside and outside Secondary Air sleeve wind before pipeline or First air turbulent burner after atmosphere cooling air flap
Air compartment behind the door；The cooling branch pipe for burning wind combustor is equipped with all the way, is connected to the air compartment of burnt wind behind the door；Wherein, it connects inside and outside
Air compartment and burnt wind are respectively equipped with expansion joint on the branch section of air compartment behind the door to Secondary Air sleeve wind behind the door；
For tangentially firing boiler, the branch pipe of a cooling wind combustor is at most equipped with two-way, is respectively connected to atmosphere cooling air flap
Air compartment after primary air piping and surrounding air air door before pipeline or a wind combustor afterwards, cooling secondary wind combustor and burnt wind
Burner is respectively provided with branch pipe all the way, is respectively connected to the air compartment of Secondary Air and burnt wind behind the door, and on the branch section of connection air compartment
It is respectively equipped with expansion joint.
6. according to claim 1-5 it is any it is described stop standby burner low-temperature flue gas cooling system, Parameters design is special
Sign is: it comprises the following specific steps that:
1) main pipe, branch's main pipe are calculated as follows, are in charge of and cooled flue gas amount in branch pipe:
1.1) cooled flue gas amount in each cooling duct is calculated as follows:
Wherein: Qi zgyFor the i-th cooling duct cooled flue gas amount, i ∈ [1, N]；N is to stop cooling duct sum in standby burner；
Qi rkFor the cooling quantity of hot air in the i-th cooling duct, kg/h；
Qi LkFor the i-th cooling duct cooling of the atmosphere air capacity, kg/h；
ti" rkTemperature when burner is left for the cooling hot-air in the i-th cooling duct, DEG C；
ti′ rkHot air temperature is cooled down for the i-th cooling duct, DEG C；
ti" LkTemperature when burner is left for the i-th cooling duct atmospheric air, DEG C；
tLkFor the i-th cooling duct ambient air temp, DEG C；
Ci rkFor (ti" rk+ti′ rkAverage air specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
Ci LkFor (ti" Lk+tLkAverage air specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
ti" yTemperature when burner is left for the i-th cooling duct low-temperature flue gas, DEG C；
tyFor the i-th cooling duct low-temperature flue gas temperature, DEG C；
Ci yFor (ti" y+tyAverage flue gas specific heat capacity at a temperature of)/2, kJ/kg. DEG C；
1.2) it is calculated as follows and is respectively in charge of middle cooled flue gas amount:
Qj fgy=∑ Qi zgy (2)
Wherein: Qj fgyIt is in charge of middle cooled flue gas amount, kg/h for jth road, j ∈ [1, M], M are to be in charge of sum；
1.3) cooled flue gas amount in each branch's main pipe is calculated as follows:
Qk fzmgy=∑ Qj fgy (3)
Wherein: Qk fzmgyFor cooled flue gas amount in kLu branch main pipe, kg/h, K ∈ [1,2]；
1.4) cooled flue gas amount in main pipe is calculated as follows:
Qmgy=∑ Qk fzmgy (4)
Wherein: QmgyFor cooled flue gas amount, kg/h in main pipe；
2) the conveying pressure difference of each series connection flue gas cooling duct is calculated as follows, i.e., the conveying pressure difference of each branch pipe series connection piping:
ΔPi ss=Py-ΔPi rs-Prc (5)
Wherein: Δ Pi ssFor the conveying pressure difference of the i-th road branch pipe series connection piping, kPa；PyFor air-introduced machine exiting flue gas gauge pressure values,
kPa；ΔPi rsFor the i-th road branch pipe series connection piping burner design resistance, kPa；PrcFor burner outlet gauge pressure values, kPa；Its
In, the i-th road branch pipe series connection piping be the i-th road branch pipe and communicate therewith be in charge of, branch's main pipe and main pipe；
3) main pipe, each branch's main pipe are calculated as follows, are respectively in charge of and each branch pipe diameter:
3.1) each branch pipe diameter is calculated as follows:
di zgy=18.8* [Qi zgy/(Wy*ρy)]0.5 (6)
Wherein: di zgyFor the i-th tunnel branch pipe diameter, mm；Qi zgyFor the i-th road branch pipe flue gas mass flow；ρyIt is flat for cooled flue gas system
Equal smoke density, kg/m3；WyFor cooled flue gas system flue gas flow rate, m/s；
3.2) it is calculated as follows and is respectively in charge of diameter:
dj fgy=18.8* [Qj fgy/(Wy*ρy)]0.5 (7)
Wherein: dj fgyIt is in charge of diameter, mm for jth road；Qj fgyIt is in charge of flue gas mass flow for jth road；
3.3) each branch's main pipe diameter is calculated as follows:
dk fzmgy=18.8* [Qk fzmgy/(Wy*ρy)]0.5 (8)
Wherein: dk fzmgyFor kLu branch main pipe diameter, mm；Qk fzmgyFor kLu branch main pipe flue gas mass flow；
3.4) main pipe diameter is calculated as follows:
dmgy=18.8* [Qmgy/(Wy*ρy)]0.5 (9)
Wherein: dmgyFor main pipe diameter, mm；QmgyFor main pipe mass flow；
4) be calculated as follows the cooled flue gas resistance of ducting and:
Wherein: Δ Pi yFor the resistance and kPa of the i-th road branch pipe series connection piping；
λmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the on-way resistance system of the i-th road branch pipe
Number；
Lmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the length of the i-th road branch pipe, m；
dmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the diameter of the i-th road branch pipe, m；
ζmg、Respectively main pipe, kLu branch main pipe, jth road be in charge of, the i-th road branch pipe coefficient of partial resistance；
5) resistance and middle maximum value Δ P of the calculated i-th road branch pipe series connection piping of step 4 are takeni y(max)If Δ Pi y(max)>Δ
Pi ss, then need to reselect each tunnel gas flow velocity Wy, then bring step 3 and step 4 into, recalculate each pipe diameter and
ΔPi y, until Δ Pi y(max)<ΔPi ss, flue gas flow rate is best flue gas flow rate at this time, straight by each pipeline under best flue gas flow rate
Diameter designs cooling system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207390A (en) * | 2019-12-06 | 2020-05-29 | 华北电力科学研究院有限责任公司 | Opposed firing boiler and temperature deviation adjusting method thereof |
| CN111539160A (en) * | 2020-04-14 | 2020-08-14 | 龙净科杰环保技术（上海）有限公司 | Method for calculating flow velocity of ammonia injection pipeline of urea denitration system of coal-fired unit |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014023202A1 (en) * | 2012-08-06 | 2014-02-13 | 山西鑫立能源科技有限公司 | Thermal cycle continuous automated coal pyrolysis furnace |
| CN204611798U (en) * | 2015-03-13 | 2015-09-02 | 国电科学技术研究院 | A kind of employing hydronic dried slag removing equipment of low temperature neat stress and furnace cinder cooling device thereof |
| CN205299509U (en) * | 2015-12-08 | 2016-06-08 | 东方电气集团东方锅炉股份有限公司 | Opposed firing boiler cooling system |
| CN206846704U (en) * | 2017-05-25 | 2018-01-05 | 东方电气集团东方锅炉股份有限公司 | A kind of coal burner cooling air system using boiler heat primary air |
| CN208058824U (en) * | 2018-02-23 | 2018-11-06 | 华能国际电力股份有限公司南通电厂 | A kind of turbulent burner for adding cooling wind |
-
2019
- 2019-06-14 CN CN201910514385.6A patent/CN110287561B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2014023202A1 (en) * | 2012-08-06 | 2014-02-13 | 山西鑫立能源科技有限公司 | Thermal cycle continuous automated coal pyrolysis furnace |
| CN204611798U (en) * | 2015-03-13 | 2015-09-02 | 国电科学技术研究院 | A kind of employing hydronic dried slag removing equipment of low temperature neat stress and furnace cinder cooling device thereof |
| CN205299509U (en) * | 2015-12-08 | 2016-06-08 | 东方电气集团东方锅炉股份有限公司 | Opposed firing boiler cooling system |
| CN206846704U (en) * | 2017-05-25 | 2018-01-05 | 东方电气集团东方锅炉股份有限公司 | A kind of coal burner cooling air system using boiler heat primary air |
| CN208058824U (en) * | 2018-02-23 | 2018-11-06 | 华能国际电力股份有限公司南通电厂 | A kind of turbulent burner for adding cooling wind |
Non-Patent Citations (2)
| Title |
|---|
| 朱昌厚 等: ""480t/h锅炉脱硝改造后的燃烧调整"", 《冶金动力》 * |
| 杨爱余 等: ""不对称燃烧在超临界机组锅炉上的应用"", 《电力学报》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111207390A (en) * | 2019-12-06 | 2020-05-29 | 华北电力科学研究院有限责任公司 | Opposed firing boiler and temperature deviation adjusting method thereof |
| CN111207390B (en) * | 2019-12-06 | 2021-11-16 | 华北电力科学研究院有限责任公司 | Opposed firing boiler and temperature deviation adjusting method thereof |
| CN111539160A (en) * | 2020-04-14 | 2020-08-14 | 龙净科杰环保技术（上海）有限公司 | Method for calculating flow velocity of ammonia injection pipeline of urea denitration system of coal-fired unit |
| CN111539160B (en) * | 2020-04-14 | 2022-10-04 | 龙净科杰环保技术（上海）有限公司 | Method for calculating flow velocity of ammonia injection pipeline of urea denitration system of coal-fired unit |
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