CN107497268A - A kind of coal-fired flue-gas processing system and coal-burning boiler system - Google Patents
A kind of coal-fired flue-gas processing system and coal-burning boiler system Download PDFInfo
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- CN107497268A CN107497268A CN201710951633.4A CN201710951633A CN107497268A CN 107497268 A CN107497268 A CN 107497268A CN 201710951633 A CN201710951633 A CN 201710951633A CN 107497268 A CN107497268 A CN 107497268A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/75—Multi-step processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D45/00—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces
- B01D45/12—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces
- B01D45/16—Separating dispersed particles from gases or vapours by gravity, inertia, or centrifugal forces by centrifugal forces generated by the winding course of the gas stream, the centrifugal forces being generated solely or partly by mechanical means, e.g. fixed swirl vanes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/76—Gas phase processes, e.g. by using aerosols
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D53/00—Separation of gases or vapours; Recovering vapours of volatile solvents from gases; Chemical or biological purification of waste gases, e.g. engine exhaust gases, smoke, fumes, flue gases, aerosols
- B01D53/34—Chemical or biological purification of waste gases
- B01D53/74—General processes for purification of waste gases; Apparatus or devices specially adapted therefor
- B01D53/86—Catalytic processes
- B01D53/8621—Removing nitrogen compounds
- B01D53/8625—Nitrogen oxides
- B01D53/8628—Processes characterised by a specific catalyst
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23B—METHODS OR APPARATUS FOR COMBUSTION USING ONLY SOLID FUEL
- F23B80/00—Combustion apparatus characterised by means creating a distinct flow path for flue gases or for non-combusted gases given off by the fuel
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2251/00—Reactants
- B01D2251/20—Reductants
- B01D2251/206—Ammonium compounds
- B01D2251/2062—Ammonia
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2258/00—Sources of waste gases
- B01D2258/02—Other waste gases
- B01D2258/0283—Flue gases
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Abstract
The present invention relates to coal-fired field, discloses a kind of coal-fired flue-gas processing system and coal-burning boiler system.The first denitrating system (SNCR spraying systems) using ammonia denitration is used cooperatively by coal-fired flue-gas processing system with the second denitrating system (SCR catalysis systems) using catalyst denitration, more preferable denitration effect can be obtained, reduce the amount of nitrogen oxides in tail gas so that coal-fired flue-gas processing system may insure that boiler all reaches the effect of emission request under any load.Coal-burning boiler system includes coal-fired flue-gas processing system and combustion system, and SCR catalysis systems are so arranged to the afterbody of steam generator system, can both reduce investment and reduce and take up an area, can reduce flue droop loss again, the power consumption for contrasting traditional scheme is greatly reduced.
Description
Technical field
The present invention relates to coal-fired field, in particular to a kind of coal-fired flue-gas processing system and coal-burning boiler system.
Background technology
With increasingly strict, the exhaustion of nitrogen oxides from coal-fired boiler amount requirement of Environmental Protection in China policy<50mg/m3(ultra-clean row
Put).Although CFBB has the ability of efficient low nitrogen burning, but if not taking special design and processes measure very
Difficulty meets current environmental requirement, though there is industry to do the outer denitration design of fluid bed furnace, structure and manufacture operating cost both at home and abroad
Very high, without economy, China is coal big country again, how to realize low nitrogen inexpensive in the stove of circulating fluidized bed combustion coal boiler
Burning, is urgent problem to be solved.
The content of the invention
It is an object of the invention to provide a kind of coal-fired flue-gas processing system, and it is able to ensure that boiler under any load all
With preferable gas cleaning effect.
Another object of the present invention is to provide a kind of coal-burning boiler system, its tail gas discharged has relatively low nitrogen oxidation
Thing content.
What embodiments of the invention were realized in：
A kind of coal-fired flue-gas processing system, coal-fired flue-gas processing system include the first denitrating system and the second denitrating system,
First denitrating system is sequentially communicated with the second denitrating system by the upstream that flue gas circulates to downstream；First denitrating system includes being used for
The primary injection apparatus and final stage injection apparatus of ammonia are sprayed, primary injection apparatus is located at the upstream of final stage injection apparatus；Second
Denitrating system includes catalytic unit, and the catalyst for denitration is filled with catalytic unit.
In an embodiment of the present invention, the first denitrating system of above-mentioned coal-fired flue-gas processing system is also including whirlwind point
From device, primary injection apparatus is arranged at the porch of cyclone separator, and final stage injection apparatus is arranged at the outlet of cyclone separator
Place.
In an embodiment of the present invention, the first denitrating system of above-mentioned coal-fired flue-gas processing system also includes being used to control
The liquefied ammonia regulating valve of ammonia emitted dose processed, the downstream of the second denitrating system are provided with the ammonia detector for detecting ammonia content, ammonia
Detector electrically connects with liquefied ammonia regulating valve.
In an embodiment of the present invention, the first denitrating system of above-mentioned coal-fired flue-gas processing system and the second denitration system
The first temperature control passage is provided between system, the first economizer is provided with the first temperature control passage；It is provided with outside first temperature control passage
By-pass flue, one end of by-pass flue are communicated to the first temperature control passage of the first economizer upstream, and its other end is communicated to first
The first temperature control passage in economizer downstream；Being provided with by-pass flue being capable of flashboard that is selectively opened or blocking by-pass flue.
In an embodiment of the present invention, the first temperature control passage of above-mentioned coal-fired flue-gas processing system and the second denitration system
One end of system connection is provided with the first temperature measurer, and flashboard is turned on and off by drive division control, the first temperature measurer and drive division
Electrical connection.
In an embodiment of the present invention, the second denitrating system communicating downstream of above-mentioned coal-fired flue-gas processing system has
Two temperature control passages, the second economizer is provided with the second temperature control passage, is provided with the second temperature control passage in Measurement channel
First oxygen analyser of oxygen content.
In an embodiment of the present invention, it is provided with nitrogen oxides at the lower exit of above-mentioned coal-fired flue-gas processing system
Detector.
The present invention provides a kind of coal-burning boiler system, and it includes above-mentioned coal-fired flue-gas processing system and combustion system,
Combustion system includes combustion chamber, for the primary air system and secondary air system to air blast in combustion chamber；Coal-fired flue-gas processing system
The link position of the entrance and combustion chamber of system, coal-fired flue-gas processing system and combustion chamber is higher than primary air system, Secondary Air
System and the link position of combustion chamber.
In an embodiment of the present invention, the outlet of the primary air system of above-mentioned coal-burning boiler system is arranged at combustion chamber
Bottom, secondary air system is connected to the side wall of combustion chamber by upper pipe, middle part pipeline and lower pipeline, and with burning
Room connects；The air outlet of upper pipe, middle part pipeline and lower pipeline is arranged at intervals from top to bottom.
In an embodiment of the present invention, the air outlet of the lower pipeline of above-mentioned coal-burning boiler system and middle part pipeline inclines
Tiltedly down, the air outlet of middle part pipeline has tangential inclination angle relative to the inwall of combustion chamber.
The beneficial effect of the embodiment of the present invention is：
The present invention coal-fired flue-gas processing system by using ammonia denitration the first denitrating system (SNCR spraying systems) with
It is used cooperatively using the second denitrating system (SCR catalysis systems) of catalyst denitration, more preferable denitration effect can be obtained, is reduced
Amount of nitrogen oxides in tail gas so that coal-fired flue-gas processing system may insure that boiler all reaches discharge under any load and wanted
The effect asked.
The coal-burning boiler system of the present invention includes coal-fired flue-gas processing system and combustion system, and combustion system includes burning
Room, for the primary air system and secondary air system to air blast in combustion chamber；The entrance of coal-fired flue-gas processing system and combustion chamber
The link position of connection, coal-fired flue-gas processing system and combustion chamber is higher than primary air system, secondary air system and the company of combustion chamber
Connect position.SCR catalysis systems are so arranged to the afterbody of steam generator system, investment can have both been reduced and reduce and take up an area, can drop again
Low flue droop loss, the power consumption for contrasting traditional scheme are greatly reduced.
Brief description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below by embodiment it is required use it is attached
Figure is briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, therefore be not construed as pair
The restriction of scope, for those of ordinary skill in the art, on the premise of not paying creative work, can also be according to this
A little accompanying drawings obtain other related accompanying drawings.
Fig. 1 is the structural representation of coal-fired flue-gas processing system in the embodiment of the present invention；
Fig. 2 is the circuit connection diagram of coal-fired flue-gas processing system in the embodiment of the present invention；
Fig. 3 is the structural representation of coal-burning boiler system in the embodiment of the present invention；
Fig. 4 is the circuit connection diagram of combustion system in the embodiment of the present invention.
Icon：100- coal-fired flue-gas processing systems；The denitrating systems of 110- first；111- primary injection apparatus；112- final stages
Injection apparatus；113- cyclone separators；114- liquefied ammonia regulating valves；115- ammonia detectors；120- the first temperature control passages；121- first
Economizer；122- by-pass flues；123- flashboards；The temperature measurers of 124- first；125- inspection doors；126- uniform flow Turbogrid plates；130-
Two denitrating systems；131- catalytic units；132- soot blowers；140- the second temperature control passages；The oxygen analysers of 142- first；144- nitrogen oxidations
Analyte detection instrument；200- coal-burning boiler systems；210- combustion systems；212- combustion chambers；220- primary air systems；230- Secondary Airs system
System；231- upper pipes；Pipeline in the middle part of 232-；233- lower pipelines；235- overfire air fans；The temperature measurers of 236- the 3rd；237- mono-
Secondary blower fan；The temperature measurers of 238- second；The oxygen analysers of 240- second；
Embodiment
To make the purpose, technical scheme and advantage of the embodiment of the present invention clearer, below in conjunction with the embodiment of the present invention
In accompanying drawing, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that described embodiment is
Part of the embodiment of the present invention, rather than whole embodiments.The present invention implementation being generally described and illustrated herein in the accompanying drawings
The component of example can be configured to arrange and design with a variety of.
Therefore, below the detailed description of the embodiments of the invention to providing in the accompanying drawings be not intended to limit it is claimed
The scope of the present invention, but be merely representative of the present invention selected embodiment.It is common based on the embodiment in the present invention, this area
The every other embodiment that technical staff is obtained under the premise of creative work is not made, belong to the model that the present invention protects
Enclose.
It should be noted that：Similar label and letter represents similar terms in following accompanying drawing, therefore, once a certain Xiang Yi
It is defined, then it further need not be defined and explained in subsequent accompanying drawing in individual accompanying drawing.
, it is necessary to explanation, term " on ", " under ", " level ", " interior ", " outer " etc. in the description of the embodiment of the present invention
The orientation or position relationship of instruction are usual based on orientation shown in the drawings or position relationship, or during invention product use
The orientation or position relationship put, it is for only for ease of description embodiments of the invention and simplifies description, rather than instruction or dark
Show that the device of meaning or element there must be specific orientation, with specific azimuth configuration and operation, thus it is it is not intended that right
The limitation of the present invention.In addition, term " first ", " second ", " the 3rd " etc. be only used for distinguish description, and it is not intended that instruction or
Imply relative importance.
In the description of the embodiment of the present invention, it is also necessary to explanation, unless otherwise clearly defined and limited, term
" setting ", " connection " should be interpreted broadly, for example, it may be being fixedly connected or being detachably connected, or integratedly be connected
Connect；Can be joined directly together, can also be indirectly connected by intermediary, can be the connection of two element internals.For this
For the those of ordinary skill in field, the concrete meaning of above-mentioned term in the present invention can be understood with concrete condition.
Embodiment
Fig. 1 is the structural representation of coal-fired flue-gas processing system 100 in the embodiment of the present invention；Fig. 2 is the embodiment of the present invention
The circuit connection diagram of middle coal-fired flue-gas processing system 100.Referring to Fig.1 and 2, the present embodiment provides a kind of coal-fired flue-gas
Processing system 100, it includes the first denitrating system 110, the first temperature control passage 120, second sequentially connected from upstream to downstream
The temperature control passage 140 of denitrating system 130 and second, the second temperature control passage 140 are communicated to going out for coal-fired flue-gas processing system 100
Mouthful, outside tail gas discharge system.
First denitrating system 110 includes being used for primary injection apparatus 111, the final stage injection apparatus 112 for spraying ammonia
And cyclone separator 113, primary injection apparatus 111 are located at the upstream of final stage injection apparatus 112；Primary injection apparatus 111 is set
The porch of cyclone separator 113 is placed in, final stage injection apparatus 112 is arranged at the exit of cyclone separator 113.
In the present embodiment, primary injection apparatus 111 and final stage injection apparatus 112 are the tubulose knot that side wall is provided with spout
Structure, primary injection apparatus 111 are connected with final stage injection apparatus 112 with the liquefied ammonia source (not shown) of its exterior by pipeline, pipe
The liquefied ammonia regulating valve 114 for controlling ammonia emitted dose is provided with line, the downstream of the second denitrating system 130 is provided with for examining
The ammonia detector 115 of ammonia content is surveyed, ammonia detector 115 electrically connects with liquefied ammonia regulating valve 114.When ammonia detector 115 measures escape
When the content of ammonia is more than 3ppm, the aperture of liquefied ammonia regulating valve 114 can be reduced, control the life of back-end surfaces hydrogen sulfate ammonia
Into maintenance system equistability.It should be understood that controller (ratio can be passed through between ammonia detector 115 and liquefied ammonia regulating valve 114
Such as PLC, single-chip microcomputer) realize reception signal and perform operation.
In the present embodiment, the injection direction of spout and the circulating direction of air-flow are consistent, to avoid blocking；Spout is using text
Diffuser pipe adds atomizer in mound, and mixed flue gas is sufficiently mixed into cyclone cylinder in apocarpy ammonia with flue gas.Using
High pressure positive blower combines conveying technology with gear pump, high pressure positive blower injection gear pump conveying liquefied ammonia, it is powerful to convey hybrid power.
Flue gas comes out the processing being followed by by final stage injection apparatus 112 from cyclone separator 113, is circulated to the first temperature control afterwards
Passage 120, the first economizer 121 is provided with the first temperature control passage 120, to reduce flue-gas temperature, to external equipment, (figure is not
Show) supply heat.In order that the temperature of flue gas will not be too low, by-pass flue 122 is provided with outside the first temperature control passage 120.It is other
One end of smoke uptake 122 is communicated to the first temperature control passage 120 of the upstream of the first economizer 121, and its other end is communicated to the first province
The first temperature control passage 120 in the downstream of coal device 121；It is provided with by-pass flue 122 and can be selectively opened or blocks by-pass flue
122 flashboard 123.
When the flue-gas temperature in the first temperature control passage 120 is too low, flashboard 123 can be opened, will be without the first economizer
121 flue gas is directly led to the downstream of the first economizer 121, avoids it from cooling at the first economizer 121, to ensure to enter the
The flue-gas temperature of two denitrating systems 130 is in a zone of reasonableness.It should be appreciated that first province's coal in the first temperature control passage 120
Device 121 can be one or two or more.In the present embodiment, automatically controlled to realize, flashboard 123 utilizes one
Individual drive division (not shown) is driven, and the downstream of the first economizer 121, the inlet upstream of the second denitrating system 130 is provided with
First temperature measurer 124, the first temperature measurer 124 electrically connect with drive division so that drive division the detection temperature of the first temperature measurer 124 compared with
When low, flashboard 123 is opened, when temperature is higher, closes flashboard 123.First temperature measurer 124, the control mode of drive division and ammonia are examined
It is similar to survey instrument 115, the control mode of liquefied ammonia regulating valve 114, single-chip microcomputer etc. can also be used to carry out data receiver and execution, driving
Portion can be motor.
In the present embodiment, by-pass flue 122, which is provided with inspection door 125, to carry out deashing to flue.Second denitration system
The porch of system 130 is provided with uniform flow Turbogrid plates 126 so that the flue gas into the second denitrating system 130 being capable of Uniform Flow.
Second denitrating system 130 includes three catalytic units 131, and it is filled with the catalyst for denitration.Catalysis
The entry position of device 131 is provided with soot blower 132, and soot blower 132 periodically carries out soot blowing to catalyst inlet, and sootblowing dielectric takes
From boiler high temperature steam, catalyst inlet and outlet are provided with pressure sensor (not shown), when pressure difference is more than certain numerical value, soot blower
132 automatic starts are cleared up, and realize soot blowing function.
Second denitrating system 130 is further equipped with inspection platform, catalyst feeding cart, maintenance door etc..Responsible pair of maintenance door
The maintenance of catalytic unit 131 and the replacing of catalyst, maintenance door use movable sealing structure, the sealing of internal activity refractory brick, urged
The replacing of agent is performed by catalyst feeding cart and maintenance door.
The effective length (length that i.e. flue gas passes through catalyst) of catalytic unit 131 is 1.3 meters, two catalytic units 131
At intervals of 1.4 meters, in the present embodiment, three catalytic units 131 of spread configuration on flow of flue gas direction, two of which fortune
Row, one it is standby.
The second temperature control of the communicating downstream passage 140 of second denitrating system 130, the second province is provided with the second temperature control passage 140
Coal device.Second temperature control passage 140 is additionally provided with the first oxygen analyser 142, and the first oxygen analyser 142 is Oxygen Analyser on Zirconia Cell.
In the present embodiment, nitrogen oxides detector 144 is provided with the lower exit of coal-fired flue-gas processing system 100,
For detecting the nitrogen oxygen content in tail gas, to facilitate judgement denitration effect.
Fig. 3 is the structural representation of coal-burning boiler system 200 in the embodiment of the present invention；Fig. 4 is to be fired in the embodiment of the present invention
The circuit connection diagram of burning system 210.Incorporated by reference to Fig. 1 to Fig. 4, the present invention also provides a kind of coal-burning boiler system 200, and it is wrapped
Coal-fired flue-gas processing system 100 and combustion system 210 are included, combustion system 210 includes combustion chamber 212, for combustion chamber 212
The primary air system 220 and secondary air system 230 of interior air blast；The entrance of coal-fired flue-gas processing system 100 connects with combustion chamber 212
It is logical, the link position of coal-fired flue-gas processing system 100 and combustion chamber 212 higher than primary air system 220, secondary air system 230 with
The link position of combustion chamber 212.Primary air system 220 with the cooperation of secondary air system 230, fuel can be in combustion chamber
Burnt in 212 in the form of fluidised.
Further, the air quantity of primary air system 220 accounts for 40% (tradition is 50%-60%) of total blast volume, and First air is excessive
Air coefficient takes 0.8-1 (traditional value is 1.2), and fuel first burns under fuel-rich conditions so that burning velocity and temperature drop
It is low, combustion process is delayed, a large amount of nitrogen-containing groups and NO in reducing atmospherexReaction, improves NOxTo N2 conversion ratio, drop
Low NOxGrowing amount in this region, First air excess air coefficient are less than 1
In the present embodiment, the outlet of primary air system 220 is arranged at the bottom of combustion chamber 212, and secondary air system 230 is logical
The side wall that upper pipe 231, middle part pipeline 232 and lower pipeline 233 are connected to combustion chamber 212 is crossed, and is connected with combustion chamber 212
It is logical；The air outlet of upper pipe 231, middle part pipeline 232 and lower pipeline 233 is arranged at intervals from top to bottom.Upper pipe
231st, middle part pipeline 232 and the outlet air quantity of lower pipeline 233 account for 20%, 10%, the 30% of total blast volume respectively.Lower pipeline
233 air-out ensures that volatile matter catches fire in time, and the air-out of middle part pipeline 232 ensures supplement oxygen content in time, upper pipe 231
Air-out ensures that coal particle fully burns, and primary air system 220, total air coefficient of secondary air system 230 are more than 1, now air
Though amount is more, because flame temperature is low, and the most of nitrogen-containing group separated out in coal has reacted completion in First air primary zone, finally
NOxGrowing amount is little, while the infeed of excess air makes the abundant after-flame of residual coke in coal particle, ensures the high burning of coal particle
Efficiency, vertical air fractional combustion can make NO in final stovexGrowing amount reduces by 30~40%.
In the present embodiment, the air outlet of lower pipeline 233 and middle part pipeline 232 tilts down.Wherein, lower pipeline
233 tilt down 45 °；The air outlet of middle part pipeline 232 tilts down 10 °, and relative to 15 ° of the inwall ring cutting of combustion chamber 212
Arrange (combustion chamber 212 is cylindrical cavity).Upper pipe 231 is horizontally disposed, increases penetration capacity, ensures after-flame.
The outlet of combustion chamber 212 sets the second oxygen analyser 240, and magnetic valve, upper pipe 231 are provided with upper pipe 231
Magnetic valve electrically connected with the second oxygen analyser 240, to control electromagnetism valve opening according to oxygen content.When combustion chamber 212 exports oxygen
When content is higher, reduce electromagnetism valve opening, ensure the low oxygen combustion of combustion chamber 212, playing reduces emitting nitride amount 30~40%
Purpose.The outlet of combustion chamber 212 is additionally provided with the second temperature measurer 238, and the second temperature measurer 238 electrically connects with overfire air fan 235, with
Control the air output of blower fan.The burning position of combustion chamber 212 is additionally provided with the 3rd temperature measurer 236, the 3rd temperature measurer 236 with once
Blower fan 237 electrically connects.
The operation principle of coal-burning boiler system 200 is：
Combustion system 210 is burnt to fuel, and flue gas rises；Second oxygen analyser 240, the second temperature measurer 238 can be with
The intake of secondary air system 230 is controlled by surveying oxygen content and the temperature of the outlet of combustion chamber 212.Flue gas enters coal-fired flue-gas
Processing system 100, the primary injection apparatus 111 of the first denitrating system 110 is first passed around, is mixed with ammonia, enters back into rotation
Wind separator 113, carry out gas solid separation.The flue gas come out from cyclone separator 113 passes through final stage injection apparatus 112, with ammonia
Mix again.Coordinate the emitted dose of control ammonia by ammonia detector 115 and liquefied ammonia regulating valve 114.Flue gas leaves the first denitration
System 110 enters the first temperature control passage 120, is cooled by the first economizer 121, the downstream of the first economizer 121 is provided with first
Temperature measurer 124, the flashboard 123 of by-pass flue 122 can be opened when the detection temperature of the first temperature measurer 124 is too low, improve flue gas and enter
Enter the temperature before the second denitrating system 130, into after the second denitrating system 130, the denitration again in the presence of catalyst, afterwards
Discharged again from the second temperature control passage 140.Second temperature control passage 140 is provided with nitrogen oxides detector 144, works as nitrous oxides concentration
Gao Shi, technical staff can be known, and check the operating mode of each link.
In summary, coal-fired flue-gas processing system of the invention is by using the first denitrating system of ammonia denitration, (SNCR sprays
Penetrate system) with being used cooperatively using the second denitrating system (SCR catalysis systems) of catalyst denitration, more preferable denitration can be obtained
Effect, reduce the amount of nitrogen oxides in tail gas so that coal-fired flue-gas processing system may insure boiler under any load all
Reach the effect of emission request.
The coal-burning boiler system of the present invention includes coal-fired flue-gas processing system and combustion system, and combustion system includes burning
Room, for the primary air system and secondary air system to air blast in combustion chamber；The entrance of coal-fired flue-gas processing system and combustion chamber
The link position of connection, coal-fired flue-gas processing system and combustion chamber is higher than primary air system, secondary air system and the company of combustion chamber
Connect position.SCR catalysis systems are so arranged to the afterbody of steam generator system, investment can have both been reduced and reduce and take up an area, can drop again
Low flue droop loss, the power consumption for contrasting traditional scheme are greatly reduced.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the present invention can have various modifications and variations.Within the spirit and principles of the invention, that is made any repaiies
Change, equivalent substitution, improvement etc., should be included in the scope of the protection.
Claims (10)
- A kind of 1. coal-fired flue-gas processing system, it is characterised in that the coal-fired flue-gas processing system include the first denitrating system and Second denitrating system, first denitrating system are connected successively with second denitrating system by the upstream that flue gas circulates to downstream It is logical；First denitrating system includes being used for the primary injection apparatus and final stage injection apparatus for spraying ammonia, the primary injection Device is located at the upstream of the final stage injection apparatus；Second denitrating system includes catalytic unit, is filled out in the catalytic unit Filled with the catalyst for denitration.
- 2. coal-fired flue-gas processing system according to claim 1, it is characterised in that first denitrating system also includes rotation Wind separator, the primary injection apparatus are arranged at the porch of the cyclone separator, and the final stage injection apparatus is arranged at The exit of the cyclone separator.
- 3. coal-fired flue-gas processing system according to claim 1, it is characterised in that first denitrating system also includes using In the liquefied ammonia regulating valve of control ammonia emitted dose, the ammonia that the downstream of second denitrating system is provided with for detecting ammonia content is examined Instrument is surveyed, the ammonia detector electrically connects with the liquefied ammonia regulating valve.
- 4. coal-fired flue-gas processing system according to claim 1, it is characterised in that first denitrating system and described the The first temperature control passage is provided between two denitrating systems, the first economizer is provided with the first temperature control passage；Described first By-pass flue is provided with outside temperature control passage, one end of the by-pass flue is communicated to described the first of the first economizer upstream Temperature control passage, its other end are communicated to the first temperature control passage in the first economizer downstream；Set in the by-pass flue Being equipped with being capable of flashboard that is selectively opened or blocking the by-pass flue.
- 5. coal-fired flue-gas processing system according to claim 4, it is characterised in that the first temperature control passage and described the One end of two denitrating systems connection is provided with the first temperature measurer, and the flashboard is turned on and off by drive division control, and described the One temperature measurer electrically connects with the drive division.
- 6. coal-fired flue-gas processing system according to claim 1, it is characterised in that the second denitrating system communicating downstream There is the second temperature control passage, the second economizer is provided with the second temperature control passage, use is provided with the second temperature control passage In the first oxygen analyser of oxygen content in Measurement channel.
- 7. coal-fired flue-gas processing system according to claim 1, it is characterised in that under the coal-fired flue-gas processing system Trip exit is provided with nitrogen oxides detector.
- 8. a kind of coal-burning boiler system, it is characterised in that it includes the coal-fired flue-gas as any one of claim 1 to 7 Processing system and combustion system, the combustion system include combustion chamber, for the First air system to air blast in the combustion chamber System and secondary air system；The entrance of the coal-fired flue-gas processing system and the combustion chamber, the coal-fired flue-gas processing system System and the link position of the combustion chamber are higher than the primary air system, the secondary air system and the connection position of the combustion chamber Put.
- 9. coal-burning boiler system according to claim 8, it is characterised in that the outlet of the primary air system is arranged at institute The bottom of combustion chamber is stated, the secondary air system is connected to the burning by upper pipe, middle part pipeline and lower pipeline The side wall of room, and with the combustion chamber；The air outlet of the upper pipe, the middle part pipeline and the lower pipeline It is arranged at intervals from top to bottom.
- 10. coal-burning boiler system according to claim 9, it is characterised in that the lower pipeline and the middle part pipeline Air outlet tilt down, the air outlet of the middle part pipeline has tangential inclination angle relative to the inwall of the combustion chamber.
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| CN201710951633.4A CN107497268A (en) | 2017-10-13 | 2017-10-13 | A kind of coal-fired flue-gas processing system and coal-burning boiler system |
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| CN108714367A (en) * | 2018-06-12 | 2018-10-30 | 王鹏 | A kind of online self-catalysis denitrification apparatus of sintering flue dust |
| CN109603475A (en) * | 2018-12-17 | 2019-04-12 | 山西晋城无烟煤矿业集团有限责任公司 | A kind of tandem SNCR processing method for realizing nitrogen oxides minimum discharge |
| CN110787622A (en) * | 2018-08-03 | 2020-02-14 | 中国石油天然气集团有限公司 | Desulfurization, denitrification and dust removal system for flue gas of slurry oil boiler |
| CN114017790A (en) * | 2021-11-03 | 2022-02-08 | 山东钢铁集团日照有限公司 | Multi-gas mixed combustion boiler for denitration |
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