CN209130922U - The pure high-alkali coal wet bottom boiler low NOx combustion system of combustion - Google Patents
The pure high-alkali coal wet bottom boiler low NOx combustion system of combustion Download PDFInfo
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- CN209130922U CN209130922U CN201821417520.2U CN201821417520U CN209130922U CN 209130922 U CN209130922 U CN 209130922U CN 201821417520 U CN201821417520 U CN 201821417520U CN 209130922 U CN209130922 U CN 209130922U
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- boiler
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
Abstract
The utility model discloses a kind of pure high-alkali coal wet bottom boiler low NOx combustion systems of combustion, which includes: burner hearth, and main burning area and burning-out zone are set in burner hearth；Side wall is arranged on the outside of burner hearth, and including front and back side wall and left and right side walls；Main burner is arranged in the main burning area of the burner hearth, and is located on the side wall of front and back；Fire air nozzle is arranged in the burning-out zone of the burner hearth, and is located on the side wall of front and back；Combustion-supporting wind snout is arranged in the left and right side walls, and has arrangement in main burning area and burning-out zone；Recirculating system, including recirculation conduit, recirculation blower, regulating valve and the air preheater for being arranged in boiler tail, in which: recirculation conduit is arranged between air preheater and combustion-supporting wind snout, one end is connect with combustion-supporting wind snout, and the other end is connected on the recirculation blower.The utility model solves the problems, such as to cannot be guaranteed low-nitrogen oxide discharging and boiler scaling when the existing boiler high-alkali coal of pure combustion.
Description
Technical field
The utility model relates to boiler low nitrogen oxide burning fields, and in particular to a kind of wet bottom boiler burner group
Group configuration system, i.e., it is pure to fire high-alkali coal wet bottom boiler low NOx combustion system and its control system.
Background technique
Power industry is the important basic industries of national economy and emphasis and production in advance in national economic development strategy
Industry.Thermal power generation is important component therein again.With gradually using up for the energy, good available fuel is fewer and fewer,
We have to be transferred to energy targets on the still high-alkali coal of rich reserves inferior.Basic anhydride Na in coal ash2O
And K2The content (in terms of the dry matrices amount score of coal) of O is known as high-alkali coal greater than 0.4%.In high-alkali coal alkali metal content compared with
Other coals want high, and coal dust softening temperature is low, in Boiler Furnace chamber inner combustion, slagging easily occur and stain boiler heating surface
The phenomenon that, boiler efficiency is reduced, the normal operation of boiler is influenced.
Currently, traditional wet bottom boiler uses the burner of same model, lead to part under the pure high-alkali coal operating condition of combustion
Coal dust is burning at side wall, and high-alkali coal is in contact with side wall, due to high viscosity and low ash smelting point, causes to tie at side wall
Slag.The arrangement of upper layer fire air nozzle simultaneously cannot guarantee that being sufficiently mixed for uncompleted burned carbon and burnout degree, directly affect coal
The burn-off rate of powder particles, to reduce boiler efficiency.On the other hand, for the pure high-alkali coal burning boiler of combustion, nitrogen oxides
National standard is much not achieved in discharge, it is necessary to the release of NOx is reduced using low NOx combusting technology in furnace.
Publication No. 205227296U, publication date are on May 11st, 2016, entitled " wall for firing high-alkali coal liquidates
Boiler low nitrogen oxide burning system " utility model patent disclose a kind of low nitrogen oxidation of wall opposed firing boiler for firing high-alkali coal
Object combustion system, the system mainly arrange auxiliary burner at burner hearth primary combustion zone nearside wall, can effectively reduce side wall
The coal powder density at place, reduces wall area thermic load, and pre- anti-flaming high-alkali burning of coal device generates slagging in primary zone domain side wall.This
Kind system only arranges auxiliary burner in side wall, can reduce the coal powder density at side wall, but for firing high-alkali coal burning boiler NOx
Generation, can not be controlled effectively.
In conclusion following problems exist in the prior art: traditional wet bottom boiler combustion system cannot be guaranteed to pacify
The effect of hjolomorphism combustion high-alkali coal and low-nitrogen oxide discharging.
Utility model content
The utility model provides a kind of pure high-alkali coal wet bottom boiler low NOx combustion system of combustion, to solve existing boiler
The problem of cannot be guaranteed low-nitrogen oxide discharging and boiler scaling when the high-alkali coal of pure combustion.
In order to solve the above technical problems, the utility model adopts the following technical solution: the pure high-alkali coal wet bottom boiler of combustion
Low NOx combustion system, comprising:
Burner hearth sets main burning area and burning-out zone in burner hearth；
Side wall is arranged on the outside of burner hearth, and including front and back side wall and left and right side walls；
Main burner is arranged in the main burning area of the burner hearth, and is located on the side wall of front and back；
Fire air nozzle is arranged in the burning-out zone of the burner hearth, and is located on the side wall of front and back,
Further include: combustion-supporting wind snout is arranged in the left and right side walls, and has cloth in main burning area and burning-out zone
It sets；
Recirculating system, including recirculation conduit, recirculation blower, regulating valve and the air preheat for being arranged in boiler tail
Device, in which: recirculation conduit is arranged between air preheater and combustion-supporting wind snout, and one end is connect with combustion-supporting wind snout, another
End is connected on the recirculation blower；
Recirculation blower, the recycled pipeline of partial fume before being arranged in air preheater, for extracting boiler tail
Into combustion-supporting wind snout；
Regulating valve is arranged on the recirculation conduit, for adjusting the stream into the flue gas recycled of combustion-supporting wind snout
Amount.
Further, the columns of the main burner is multiple row, and the number of plies is multilayer, and front and back side wall liquidates arrangement.
Further, the columns of the fire air nozzle is multiple row, and the number of plies is multilayer, and front and back side wall liquidates arrangement.
Further, the combustion-supporting wind snout be located at and the contour position of the main burner, and be located at the burnout degree
The obliquely downward of spout.
Further, the combustion-supporting wind snout is multiple row, and the number of plies is multilayer, and combustion air spray is arranged in left and right side walls
Mouthful.
Further, the pure high-alkali coal wet bottom boiler low NOx combustion system of combustion further includes automatic control system, automatic to control
System processed includes monitoring system, boiler control system and control processor；
Monitoring system, including pulverized coal flow on-line monitoring system, pressure monitor system, smoke on-line monitoring system；
Boiler control system, including Limestone control system, reduced air amount control system；
Control processor, including input terminal, processor and output end；
Input terminal, for receiving the various information by monitoring system acquisition；
Processor, one end connect with the input terminal, and one end connects output end, is inputted for handling by the input terminal
Signal；
The control signal that processor transmits is output in corresponding boiler control system, to control the pot by output end
Furnace control system executes corresponding operation, and wherein Limestone control system is adjusted by receiving the signal value of the output end output
Coal saving powder flow, reduced air amount control system adjust recirculating air volume by receiving the signal value that the output end exports.
Further, the pulverized coal flow on-line monitoring system is arranged between bellows and the main burner, and acquisition is worked as
The distribution situation of preceding unit coal powder density and primary air velocity.
Further, the pressure monitor system is the pressure gauge for being separately mounted to each pipeline, for obtaining each point
Pressure condition.
Further, the smoke on-line monitoring system is CEMS measuring instrument, is directly installed on flue and carries out to flue gas
Measurement, for measuring the concentration of NO in flue gas.
The beneficial effect of the utility model combustion system is:
The utility model installs combustion-supporting wind snout additional on the basis of traditional coal-burning boiler, and flue gas recirculation is combined automatically
Control is reasonably applied to the coal powder density that can be effectively reduced boiler side wall, prevents the knot of the pure high-alkali coal burning boiler heating surface of combustion
Slag stains phenomenon, is effectively reduced pure high-alkali coal burning boiler exit NOx concentration, and then ensure that the safe operation of boiler.
A variety of low NOx combusting technologies such as air classification technology and flue gas recirculating technique are coupled together by the utility model,
To boiler tail flue gas secondary use, combustion-supporting wind snout is introduced by recirculating gas duct, can not only reduce the cigarette in main burning area
Temperature degree, inhibits the generation of thermal NO x, and can use reproducibility atmosphere, further decreases the release of nitrogen oxides, plays
The effect of energy-saving and emission-reduction.
The utility model cooperation is equipped with automatic control system, under the premise of accurate monitoring system, carries out to whole system
A series of automatic control can accurately grasp the combustion case of each point under each operating condition.
Detailed description of the invention
Fig. 1 is the overall schematic of the utility model embodiment.
Fig. 2 is burner group's distribution map in the utility model embodiment at the side wall of front and back.
Drawing reference numeral explanation:
1- burner hearth, 2- side wall, 3- main burner, 4- main burning area, 5- fire air nozzle, 6- burning-out zone, 7- air preheat
Device, 8- recirculation blower, 9- recirculation conduit, the combustion-supporting wind snout of 10-, 11- regulating valve.
Specific embodiment
It elaborates below in conjunction with attached drawing to specific embodiment of the present utility model.
In order to cannot be guaranteed low-nitrogen oxide discharging and boiler scaling when solving the problems, such as the existing boiler high-alkali coal of pure combustion, this
Utility model provides the high-alkali coal wet bottom boiler low NOx combustion system of the pure combustion of one kind and combustion control system, the burning system
The recycling of boiler tail flue gas may be implemented in system, realizes low NOx drainage, while also reducing side wall coal powder density, effectively
Ground prevents the slagging of boiler heating surface.
As depicted in figs. 1 and 2, the high-alkali coal wet bottom boiler low NOx combustion system of the pure combustion of the utility model, comprising:
Burner hearth 1 sets main burning area 4 and burning-out zone 6 in burner hearth 1；
Side wall 2 is arranged on the outside of burner hearth, and including front and back side wall and left and right side walls；
Main burner 3 is arranged in the main burning area 4 of the burner hearth, and is located on the side wall of front and back；
Fire air nozzle 5 is arranged in the burning-out zone 6 of the burner hearth, and is located on the side wall of front and back；
Combustion-supporting wind snout 10, is arranged in the left and right side walls, and has arrangement in main burning area 4 and burning-out zone 6；
Recirculating system, including recirculation conduit 9, recirculation blower 8, regulating valve 11 and the air for being arranged in boiler tail
Preheater 7, in which: recirculation conduit 9 is arranged between air preheater 7 and combustion-supporting wind snout 10, one end and combustion-supporting wind snout
10 connections, the other end are connected on the recirculation blower 8；
Recirculation blower 8, the recycled pipe of partial fume before being arranged in air preheater 7, for extracting boiler tail
Road 9 enters combustion-supporting wind snout 10；
Regulating valve 11 is arranged on the recirculation conduit 9, for adjusting the flue gas recycled into combustion-supporting wind snout 10
Flow.
Further, the number of the main burner 3 is multiple row, for example, 5 column or 6 column, and the number of plies is multilayer, for example,
2 layers or 3 layers, and front and back side wall liquidates arrangement, to reach optimal combustion efficiency.
Further, the fire air nozzle 5 is multiple row, for example, 5 column or 6 column, and the number of plies is multilayer, for example, 2 layers
Or 3 layers, and front and back side wall liquidates arrangement, to reach highest boiler combustion efficiency.
Further, the combustion-supporting wind snout 10 is multiple row, and for example, 4 column are arranged in the two sides of the boiler 1
Wall is disposed with the combustion-supporting wind snout of 2 column on each side wall 2, guarantees the coal dust energy completely burned close to side wall.
Further, the combustion-supporting wind snout 10 be located at and the contour position of the main burner 3, to meet primary zone 4
Air dynamic behaviour.
Further, the combustion-supporting wind snout 10 is located at the obliquely downward of the fire air nozzle 5.
Further, the recirculation blower 8 is multiple, for example, 5, is arranged in front of air preheater 7 for extracting
The partial fume of boiler tail enters the combustion-supporting wind snout 10, and respectively 5 layers of combustion-supporting wind snout provide flue gas.
Further, the recirculation conduit 9 is multiple, be arranged in air preheater 7 and the combustion-supporting wind snout 10 it
Between, it for example, 5, is connect respectively with 5 layers of combustion-supporting wind snout 10.
Further, the regulating valve 11 is also multiple.
Further, the internal diameter of the combustion-supporting wind snout 10 is less than the internal diameter of the main burner 3, and is less than or equal to
The internal diameter of the fire air nozzle 5.
The utility model installs combustion-supporting wind snout additional on the basis of traditional coal-burning boiler, and flue gas recirculation is combined automatically
Control is reasonably applied to the coal powder density that can be effectively reduced boiler side wall, prevents the knot of the pure high-alkali coal burning boiler heating surface of combustion
Slag stains phenomenon, is effectively reduced pure high-alkali coal burning boiler exit NOx concentration, and then ensure that the safe operation of boiler.
A variety of low NOx combusting technologies such as air classification technology and flue gas recirculating technique are coupled together by the utility model,
To boiler tail flue gas secondary use, combustion-supporting wind snout is introduced by recirculating gas duct, can not only reduce the cigarette in main burning area
Temperature degree, inhibits the generation of thermal NO x, and can use reproducibility atmosphere, further decreases the release of nitrogen oxides, plays
The effect of energy-saving and emission-reduction.
The high-alkali coal wet bottom boiler low NOx combustion system of the pure combustion of the utility model further includes automatic control system, from
Autocontrol system includes monitoring system, boiler control system and control processor；
Monitoring system, including pulverized coal flow on-line monitoring system, pressure monitor system, smoke on-line monitoring system；
Boiler control system, including Limestone control system, reduced air amount control system；
Control processor, including input terminal, processor and output end；
Input terminal, for receiving the various information by monitoring system acquisition；
Processor, one end connect with the input terminal, and one end connects output end, is inputted for handling by the input terminal
Signal；
The control signal that processor transmits is output in corresponding boiler control system, to control the pot by output end
Furnace control system executes corresponding operation, and wherein Limestone control system is adjusted by receiving the signal value of the output end output
Coal saving powder flow, reduced air amount control system adjust the regulating valve 11 by receiving the signal value that the output end exports
Aperture, thus adjust into the combustion-supporting wind snout 10 flue gas recycled flow.
Further, the pulverized coal flow on-line monitoring system is arranged between a bellows and the main burner 3, is obtained
Take the distribution situation of current unit coal powder density and primary air velocity.
Further, the pressure monitor system is mainly pressure gauge, is separately mounted to each pipeline, each for obtaining
The pressure condition of point.
Further, the smoke on-line monitoring system is CEMS measuring instrument, is directly installed on flue and carries out to flue gas
Measurement, does not need to release flue gas, and usually using nitrogen oxides etc. to the characteristic absorption spectrum of infrared light or ultraviolet light, use is red
Outer or ultraviolet light beam measures flue gas in flue, but infrared or ultraviolet method analyzer can only generally detect NO, not examine
Survey NO2, generally use NO multiplied by 1.05 as NOx content.
The automatic control system that the utility model is equipped with can be to whole system under the premise of accurate monitoring system
A series of automatic control is carried out, the combustion case of each point under each operating condition can be accurately grasped.
The invention also discloses a kind of Combustion System sides of pure high-alkali coal wet bottom boiler low NOx combustion system of combustion
Method, comprising the following steps:
The first step, being obtained by firing optimization experiment or operations staff's experience fires boiler under each legal operating condition
The combustion control signal value output that burning state is optimal, including pulverized coal flow, pressure, unburned carbon in flue dust, NOx discharge
Deng then these numerical value are saved in a Two dimensional control interpolation table；
The pure high-alkali coal dust of certain fineness is sent into main burner by First air, subsequently into burner hearth, supply by second step
Primary air flow appropriate, primary air flow for example account for the 25% ~ 28% of total blast volume, build oxygen debt environment, realize low oxygen combustion；
It is passed through secondary air flow in primary zone coal dust is provided and burn away required oxygen, Secondary Air includes inner second air and outer
Secondary Air；The burn-off rate that burnout degree improves coal dust is supplied simultaneously, and after-flame air quantity for example accounts for the 20% ~ 23% of total blast volume；And by boiler
Tail flue gas is sent into combustion-supporting wind snout by recirculation conduit；
By the monitoring system monitoring boiler data in combustion process, supervised using the pulverized coal flow on-line monitoring system
The distribution situation for surveying current unit coal powder density and primary air velocity monitors the pressure feelings of each point using the pressure monitor system
Condition, using the concentration of the smoke on-line monitoring system (CEMS measuring instrument) NO measured directly, on this basis multiplied by 1.05
Obtain the concentration of emission of NOx；
The data of above-mentioned monitoring are uniformly aggregated into processor by third step, are reached via processor treated signal defeated
Then outlet arrives boiler control system control boiler, specific control process is as follows:
The processor receives the data-signal of input and the data comparison of the Two dimensional control interpolation table, and output phase is answered
Control signal, control Limestone control system, increase or reduce coal-supplying amount；
The data comparison of the processor signal and the Two dimensional control interpolation table according to the input data, output phase are answered
Control signal, control reduced air amount control system, adjust the valve opening, thus increase or reduce reduced air
Amount.
The method for controlling combustion of the utility model can carry out a series of automatic control to whole system, can accurately grasp
The combustion case of each point under each operating condition, automatically adjusting parameter reduce the waste of human resources again while improving boiler efficiency,
It can be effectively reduced pure high-alkali coal burning boiler exit NOx concentration, the coal powder density in side wall area is reduced, prevent boiler scaling.
Above embodiments are only to illustrate rather than limit the technical solution of the utility model, although referring to above-described embodiment pair
The utility model is described in detail, those skilled in the art should understand that: still can to the utility model into
Row modification or equivalent replacement should all without departing from any modification or partial replacement of the spirit and scope of the utility model
Cover in the scope of the claims of the utility model.
Claims (5)
1. the pure high-alkali coal wet bottom boiler low NOx combustion system of combustion, comprising:
Burner hearth sets main burning area and burning-out zone in burner hearth；
Side wall is arranged on the outside of burner hearth, and including front and back side wall and left and right side walls；
Main burner is arranged in the main burning area of the burner hearth, and is located on the side wall of front and back；
Fire air nozzle is arranged in the burning-out zone of the burner hearth, and is located on the side wall of front and back, it is characterised in that:
Further include: combustion-supporting wind snout is arranged in the left and right side walls, and has arrangement in main burning area and burning-out zone；
Recirculating system, including recirculation conduit, recirculation blower, regulating valve and the air preheater for being arranged in boiler tail,
Wherein: recirculation conduit is arranged between air preheater and combustion-supporting wind snout, and one end is connect with combustion-supporting wind snout, the other end
It is connected on the recirculation blower；
Recirculation blower, before being arranged in air preheater, the recycled pipeline of partial fume for extracting boiler tail enters
Combustion-supporting wind snout；
Regulating valve is arranged on the recirculation conduit, for adjusting the flow into the flue gas recycled of combustion-supporting wind snout.
2. the pure high-alkali coal wet bottom boiler low NOx combustion system of combustion according to claim 1, it is characterised in that: described
The columns of main burner is multiple row, and the number of plies is multilayer, and front and back side wall liquidates arrangement.
3. the pure high-alkali coal wet bottom boiler low NOx combustion system of combustion according to claim 1, it is characterised in that: described
The columns of fire air nozzle is multiple row, and the number of plies is multilayer, and front and back side wall liquidates arrangement.
4. the pure high-alkali coal wet bottom boiler low NOx combustion system of combustion according to claim 1, it is characterised in that: described
Combustion-supporting wind snout is located at and the contour position of the main burner, and is located at the obliquely downward of the fire air nozzle.
5. the pure high-alkali coal wet bottom boiler low NOx combustion system of combustion according to claim 1, it is characterised in that: described
Combustion-supporting wind snout is multiple row, and the number of plies is multilayer, and combustion-supporting wind snout is arranged in left and right side walls.
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| CN201821417520.2U CN209130922U (en) | 2018-08-31 | 2018-08-31 | The pure high-alkali coal wet bottom boiler low NOx combustion system of combustion |
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| CN201821417520.2U CN209130922U (en) | 2018-08-31 | 2018-08-31 | The pure high-alkali coal wet bottom boiler low NOx combustion system of combustion |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114588A (en) * | 2018-08-31 | 2019-01-01 | 华北水利水电大学 | It is pure to fire high-alkali coal wet bottom boiler low NOx combustion system and method for controlling combustion |
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- 2018-08-31 CN CN201821417520.2U patent/CN209130922U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109114588A (en) * | 2018-08-31 | 2019-01-01 | 华北水利水电大学 | It is pure to fire high-alkali coal wet bottom boiler low NOx combustion system and method for controlling combustion |
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