CN204165042U - Middle Low Temperature Thermal flue gas powder feeding coal powder burner - Google Patents

Middle Low Temperature Thermal flue gas powder feeding coal powder burner Download PDF

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Publication number
CN204165042U
CN204165042U CN201420483793.2U CN201420483793U CN204165042U CN 204165042 U CN204165042 U CN 204165042U CN 201420483793 U CN201420483793 U CN 201420483793U CN 204165042 U CN204165042 U CN 204165042U
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CN
China
Prior art keywords
air
burner
flue gas
powder
coal
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Expired - Fee Related
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CN201420483793.2U
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Chinese (zh)
Inventor
王欢
王民发
郎鹏德
郎凤娥
张宗旺
王哲
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SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd
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SHANXI LANTIAN ENVIRONMANTAL ENGINEERING Co Ltd
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Abstract

The utility model discloses Low Temperature Thermal flue gas powder feeding coal powder burner in one, comprise roots blower, flue gas recirculation pipeline, the coal, pulverulent fuel mixer be made up of airduct and powder sinking tube, burner, wherein burner comprises First air central tube, inner second air pipe, outer second air pipe, bluff body, enlarging.Effectively can solve the current coal burner length duration of ignition for Industrial Boiler by adopting middle Low Temperature Thermal flue gas powder feeding coal powder burner provided by the utility model, fuel consumption is large, flame holding is poor, and coal adaptability is poor, NO xthe problems such as discharge capacity is large.

Description

Middle Low Temperature Thermal flue gas powder feeding coal powder burner
Technical field
The utility model belongs to industrial coal powder boiler combustion field, particularly relates to Low Temperature Thermal flue gas powder feeding coal powder burner in one.
Background technology
In current Industrial Boiler market, the share of about about 85% is coal-burned industrial boiler, be widely used in the field such as industrial production and building and heating, in addition the coal-burned industrial boiler ubiquity inefficiency of China, average operating efficiency is only 60%-65%, visible, the problem of environmental pollution that coal-burned industrial boiler year consuming nearly 700,000,000 tons of coal causes is extremely serious, the SO that annual coal-burned industrial boiler produces 2about 1,000 ten thousand tons, NO xabout 2,000,000 tons, about 1,000,000 tons, dust, discharge capacity is only second to coal fired power generation.Wherein, SO 2and the comparatively maturation that Dust Control Technology has developed, but NO xcontrol technology be still the difficult point in coal-burned industrial boiler Environmental capacity field.In addition, the adaptability problem, stable combustion problem etc. of coal are also coal-burned industrial boiler long-standing high-lighting problems in combustion.
Combustion system poor performance causes the key factor of the problems referred to above, and the performance improving combustion system is the necessity and effective way of dealing with problems.The structure etc. of automatic powder feeding system, air distribution mode, burner is all the key factor affecting combustion system performance.
Summary of the invention
The utility model aims to provide Low Temperature Thermal flue gas powder feeding coal powder burner in one, large with the coal burner length duration of ignition, the fuel consumption that solve Industrial Boiler in prior art, the problems such as flame holding is poor, and coal adaptability is poor, and NOX discharge capacity is large.
The technical solution of the utility model is: Low Temperature Thermal flue gas powder feeding coal powder burner in one, comprise roots blower, the entrance point of described roots blower is connected to the flue between industrial coal powder boiler and air preheater, or is connected to the flue between industrial coal powder boiler and economizer; Flue gas recirculation pipeline, described roots blower the port of export be connected with the entrance point of described flue gas recirculation pipeline; Coal, pulverulent fuel mixer, described coal, pulverulent fuel mixer comprises airduct and powder sinking tube, and described powder sinking tube is communicated with the upper surface of airduct, and the port of export of described flue gas recirculation pipeline is connected with the entrance point of described airduct; Burner, described burner comprises First air central tube, inner second air pipe, outer second air pipe, bluff body, enlarging, described First air central tube, inner second air pipe, outer second air pipe are set with from the inside to the outside successively side by side, the adjustable damper of aperture is equipped with in the import department of described inside and outside secondary air channel, axially adjustable swirl vane is provided with in described outer second air pipe, described swirl vane is circumferentially arranged, eddy flow angle is 40-55 odescribed bluff body is discoid (i.e. the demilune shape) of lordosis, before being positioned at the port of export of First air central tube and inner second air pipe, be provided with enlarging at the end of described burner, First air central tube, inner second air pipe, outer second air pipe, bluff body are shunk in burner.
As a kind of preferred embodiment, the angle of described airduct central axis and described powder sinking tube axis is 52-90o.
As a kind of preferred embodiment, the areas that are whole and described inner second air pipe 1/4 ~ 9/16 of described First air central tube are covered by bluff body.
As a kind of preferred embodiment, described First air central tube 1/2-is all covered by bluff body.
The burning process of this device is: using Low Temperature Thermal flue gas in pulverized-coal fired boiler afterbody as First air, flue gas recirculation pipeline is flowed through through roots blower, fully mix with the coal dust fallen from coal, pulverulent fuel mixer powder sinking tube in coal, pulverulent fuel mixer airduct, the primary wind and powder be mixed to form is by First air central tube pulverized coal conveying, regulate the air quantity in inside and outside secondary air channel, wherein, inner second air encounters bluff body in exit, send into burner hearth after mixing with the primary wind and powder in First air central tube, outer second air enters burner hearth produce eddy flow under the effect of swirl vane after; Wherein, the wind speed in described First air central tube is 15 ~ 20m/s, and described inner second air axial velocity is 18 ~ 30m/s, and described outer second air axial velocity is 30 ~ 40m/s.
In above-mentioned burning process, using Low Temperature Thermal flue gas in pulverized-coal fired boiler afterbody as First air pulverized coal conveying, the recirculation of partial fume in system can be realized, wherein, 200 ~ 300 DEG C are generally as the temperature of Low Temperature Thermal flue gas in First air, in coal, pulverulent fuel mixer with coal dust mixed primary wind and powder temperature >=140 DEG C, wind powder stream can be reduced and be heated to heat needed for ignition temperature, the of short duration igniting of micro-oil/nothing oil can be realized, strengthening coal powder ignition, wherein, the angle of described coal, pulverulent fuel mixer apoplexy tube hub axis and powder sinking tube axis is 70-90o, more can ensure the smooth and easy of coal dust Geldart-D particle.In addition, the choose reasonable of the installation site of bluff body, the shape of bluff body, bluff body structure size ensure that the mixed effect of middle Low Temperature Thermal flue gas breeze airflow in First air central tube and direct current inner second air is good, for coal dust catching fire and surely good condition is created in combustion.In the enlarging of burner end, First air central tube, inner second air pipe, outer second air pipe, bluff body are shunk in burner, achieves an enlarging and water conservancy diversion is carried out to the air-flow in First air central tube, inner second air pipe, outer second air pipe, mixed air-flow simultaneously.
The beneficial effect compared with prior art had.
(1) rapid-ignition of micro-oil/nothing oil can be realized: Low Temperature Thermal flue gas pulverized coal conveying in utilization, wind powder mixed airflow in First air central tube can be heated to more than 140 DEG C, decrease wind powder mixed airflow and be heated to heat needed for ignition temperature, the of short duration igniting of micro-oil/nothing oil can be realized, strengthening coal powder ignition.
(2) NO is reduced xdischarge capacity: in utilization, Low Temperature Thermal flue gas substitutes air as First air, adopt the air supply mode of secondary air separating level air-distribution simultaneously, by regulating the damper of secondary air channel import department, the amount of oxygen of zones of different in burner is control effectively, should ensure that oxygen sufficient needed for burning ensures to present reducing atmosphere in flame kernel district in a big way again, suppress the oxidation of nitrogen, reduce NO xgrowing amount.
(3) flame holding of coal dust is improved: on the one hand, in First air, Low Temperature Thermal flue gas has certain temperature, effectively shortens the incubation time of coal powder ignition; On the other hand, the swirl vane installed additional in secondary air channel outside and install enlarging additional at burner end, can form the reverse reflux of high-temperature flue gas, high temperature recirculation zone as stable thermal source, breeze airflow can be made timely smooth combustion of fighting.
(4) coal adaptability is improved: the weak point of low-volatile coal is that ignition and steady combustion exists larger difficulty, the utility model enhances the ignition and steady combustion of coal dust in the mode that middle Low Temperature Thermal flue gas recirculation combines with staged air distribution technology, can adapt to the coal dust of more extensive coal.
Accompanying drawing explanation
Fig. 1 is structural representation of the present utility model.
1. connect heat smoke before air preheater; 2. roots blower; 3. flue gas recirculation pipe; 4. coal, pulverulent fuel mixer powder sinking tube;
5. coal, pulverulent fuel mixer airduct; 6. First air central tube; 7. inner second air pipe; 8. outer second air pipe; 9. swirl vane; 10. disc type bluff body; 11. enlargings.
Detailed description of the invention
For illustrating that technical characteristic of the present utility model, object and beneficial effect have understanding clearly better, carry out following detailed description referring now to accompanying drawing 1 pair of the technical solution of the utility model, but can not be interpreted as to of the present utility model can the restriction of practical range.
Present embodiments provide Low Temperature Thermal flue gas powder feeding coal powder burner in one, as described in Figure 1, this device comprises: roots blower 2, flue gas recirculation pipe 3, coal, pulverulent fuel mixer powder sinking tube 4, coal, pulverulent fuel mixer airduct 5, First air central tube 6, inner second air pipe 7, outer second air pipe 8, swirl vane 9, bluff body 10, enlarging 11, wherein:
The entrance point of roots blower 2 is connected to the flue between industrial coal powder boiler and air preheater;
Roots blower 2 the port of export be connected with the entrance point of flue gas recirculation pipeline 3;
Coal, pulverulent fuel mixer is made up of coal, pulverulent fuel mixer powder sinking tube 4 and coal, pulverulent fuel mixer airduct 5 two parts, and coal, pulverulent fuel mixer powder sinking tube 4 is communicated with coal, pulverulent fuel mixer airduct 5 upper surface, and coal, pulverulent fuel mixer airduct 5 central axis
Be 80 with the angle of coal, pulverulent fuel mixer powder sinking tube 4 axis o;
Burner comprises First air central tube 6, inner second air pipe 7, outer second air pipe 8, bluff body 10, enlarging 11, First air central tube 6, inner second air pipe 7, outer second air pipe 8 are set with from the inside to the outside successively side by side, the adjustable damper of aperture is equipped with in the import department of inner second air pipe 7, outer second air pipe 8, and be provided with axially adjustable swirl vane 9 in secondary air channel 8 outside, swirl vane 9 is circumferentially arranged, eddy flow angle is 40-55 obluff body 10 is the discoid of lordosis, before being positioned at the port of export of First air central tube 6 and inner second air pipe 7, enlarging 11 is also provided with at the end of burner, First air central tube 6, inner second air pipe 7, outer second air pipe 8, bluff body 10 are shunk in burner, wherein, the areas that are whole and described inner second air pipe 4/9 of First air central tube 6 are covered by bluff body 10.
The burning process of this device is: using Low Temperature Thermal flue gas in pulverized-coal fired boiler afterbody as First air, flue gas recirculation pipeline is flowed through through roots blower, fully mix with the coal dust fallen from coal, pulverulent fuel mixer powder sinking tube in coal, pulverulent fuel mixer airduct, the primary wind and powder be mixed to form is by First air central tube pulverized coal conveying, regulate the air quantity in inside and outside secondary air channel, wherein, inner second air encounters bluff body in exit, send into burner hearth after mixing with the primary wind and powder in First air central tube, outer second air enters burner hearth produce eddy flow under the effect of swirl vane after; Wherein, the wind speed in First air central tube is 15 ~ 20m/s, and inner second air axial velocity is 18 ~ 30m/s, and outer second air axial velocity is 30 ~ 40m/s.
More than describe preferred embodiment of the present utility model in detail; but the utility model is not limited to the detail in above-mentioned embodiment; within the scope of technical conceive of the present utility model; can carry out multiple simple variant to the technical solution of the utility model, these simple variant all belong to protection domain of the present utility model.

Claims (4)

1. a Low Temperature Thermal flue gas powder feeding coal powder burner in, is characterized in that comprising:
Roots blower, the entrance point of described roots blower is connected to the flue between industrial coal powder boiler and air preheater, or is connected to the flue between industrial coal powder boiler and economizer;
Flue gas recirculation pipeline, described roots blower the port of export be connected with the entrance point of described flue gas recirculation pipeline;
Coal, pulverulent fuel mixer, described coal, pulverulent fuel mixer comprises airduct and powder sinking tube, and described powder sinking tube is communicated with the upper surface of airduct, and the port of export of described flue gas recirculation pipeline is connected with the entrance point of described airduct;
Burner, described burner comprises First air central tube, inner second air pipe, outer second air pipe, bluff body, enlarging, described First air central tube, inner second air pipe, outer second air pipe are set with from the inside to the outside successively side by side, the adjustable damper of aperture is equipped with in the import department of described inside and outside secondary air channel, axially adjustable swirl vane is provided with in described outer second air pipe, described swirl vane is circumferentially arranged, eddy flow angle is 40-55 o, described bluff body is in the form of annular discs, before being positioned at the port of export of First air central tube and inner second air pipe, is provided with enlarging at the end of described burner, First air central tube, inner second air pipe, outer second air pipe, bluff body is shunk in burner.
2. middle Low Temperature Thermal flue gas powder feeding coal powder burner as claimed in claim 1, is characterized in that: the angle of described airduct central axis and described powder sinking tube axis is 52-90o.
3. middle Low Temperature Thermal flue gas powder feeding coal powder burner as claimed in claim 1 or 2, is characterized in that: the areas that are whole and described inner second air pipe 1/4 ~ 9/16 of described First air central tube are covered by bluff body.
4. middle Low Temperature Thermal flue gas powder feeding coal powder burner as claimed in claim 1 or 2, is characterized in that: described First air central tube 1/2-is all covered by bluff body.
CN201420483793.2U 2014-08-26 2014-08-26 Middle Low Temperature Thermal flue gas powder feeding coal powder burner Expired - Fee Related CN204165042U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201420483793.2U CN204165042U (en) 2014-08-26 2014-08-26 Middle Low Temperature Thermal flue gas powder feeding coal powder burner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201420483793.2U CN204165042U (en) 2014-08-26 2014-08-26 Middle Low Temperature Thermal flue gas powder feeding coal powder burner

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105716081A (en) * 2016-01-27 2016-06-29 北京泷涛环境科技有限公司 Low-resistance adjustable swirling disk
CN108253447A (en) * 2018-03-23 2018-07-06 山西文龙中美环能科技股份有限公司 Biomass couples pulverized coal combustion system and its control method

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105716081A (en) * 2016-01-27 2016-06-29 北京泷涛环境科技有限公司 Low-resistance adjustable swirling disk
CN108253447A (en) * 2018-03-23 2018-07-06 山西文龙中美环能科技股份有限公司 Biomass couples pulverized coal combustion system and its control method
CN108253447B (en) * 2018-03-23 2023-10-20 山西文龙中美环能科技股份有限公司 Biomass coupling pulverized coal combustion system and control method thereof

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CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20150218

Termination date: 20150826

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