CN107461736A - A kind of gas industry boiler smoke recycling denitration and air preheating system - Google Patents
A kind of gas industry boiler smoke recycling denitration and air preheating system Download PDFInfo
- Publication number
- CN107461736A CN107461736A CN201710839557.8A CN201710839557A CN107461736A CN 107461736 A CN107461736 A CN 107461736A CN 201710839557 A CN201710839557 A CN 201710839557A CN 107461736 A CN107461736 A CN 107461736A
- Authority
- CN
- China
- Prior art keywords
- flue gas
- air
- flashboard
- backflow
- intelligent
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000779 smoke Substances 0.000 title claims abstract description 17
- 238000004064 recycling Methods 0.000 title claims abstract description 12
- 239000003546 flue gas Substances 0.000 claims abstract description 103
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 102
- 239000007789 gas Substances 0.000 claims abstract description 25
- 238000002485 combustion reaction Methods 0.000 claims abstract description 16
- 239000000567 combustion gas Substances 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims description 6
- 235000019504 cigarettes Nutrition 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 2
- 230000003134 recirculating effect Effects 0.000 claims description 2
- 230000007613 environmental effect Effects 0.000 description 3
- 230000036760 body temperature Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000002671 adjuvant Substances 0.000 description 1
- 210000000481 breast Anatomy 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000003345 natural gas Substances 0.000 description 1
- FGIUAXJPYTZDNR-UHFFFAOYSA-N potassium nitrate Chemical compound [K+].[O-][N+]([O-])=O FGIUAXJPYTZDNR-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/006—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber the recirculation taking place in the combustion chamber
-
- 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
- F23L15/00—Heating of air supplied for combustion
- F23L15/04—Arrangements of recuperators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C2202/00—Fluegas recirculation
- F23C2202/10—Premixing fluegas with fuel and combustion air
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Supply (AREA)
Abstract
The present invention relates to a kind of recycling denitration of gas industry boiler smoke and air preheating system, including combustion gas adapter (2), burner (4) and boiler body (5), the combustion gas of combustion gas adapter (2) conveying is burnt under being acted on by burner (4) in boiler body (5), flue gas after burning is exported by the flue gas adapter (3) of boiler body (5), it is characterised in that：Also include flue gas recirculation pipeline, it delivers to the flue gas after burning in burner (4) again with air mixed combustion, is generated so as to suppress NOx；He also includes air preheat pipeline, and it is preheated using furnace sandwich (9) to the air of burning, boiler inlet temperature is improved, so as to improve boiler thermal output.
Description
Technical field
The present invention relates to the low emission of gas industry boiler and energy-saving field, especially a kind of gas industry boiler smoke follows again
Ring denitration and air preheating system.
Background technology
Existing back yard industry gas fired-boiler, combustion denitration or denitrating flue gas typically are used, combustion denitration must use low NOx
Burner；And the method for denitrating flue gas (SNCR or SCR), it must ensure its running temperature section, to be otherwise difficult to ensure that its denitration
Efficiency.Because gas industry boiler tonnage is smaller, ordinary circumstance does not arrange air preheater.
In view of the characteristics of small gas Industrial Boiler, it typically uses combustion denitration method, more to rely on high-quality combustion of burning
Expect natural gas, and reach denitration purpose.But in view of environmental requirement at present is increasingly strict, merely by combustion denitration its NOx most
Still in more than 50mgm-3, and when fuel changes, some small gas boiler emissions reach 100mg for discharge eventually
m-3More than, far beyond the 30mgm of Beijing-tianjin-hebei Region requirement-3Below, it is necessary to take combustion denitration collaboration to be taken off using flue gas
The means of nitre can be only achieved the environmental requirement of Beijing area.
Existing flue gas recirculating technique, by manual control flue gas recirculation pipeline valve aperture, so as to control flue gas again
There is the hysteresis quality inaccuracy of flue gas recirculation amount control simultaneously in internal circulating load, artificial judgment, exhaust gas volumn is excessive easily to cause boiler to go out
Fire, the too small denitration efficiency of exhaust gas volumn cannot be guaranteed.
In addition, because cold air enters boiler, unfavorable for burning, air themperature is low to cause boiler thermal output to decline, sternly
It can cause to put out a fire during weight, in the boiler startup stage, preheated air can effectively reduce the burning-point of combustible material, to ignition of the boiler
Effectively.
The content of the invention
The present invention devises a kind of gas industry boiler smoke recycling denitration and air preheating system, its technology solved
Problem is：(1) the emission denitration ratio of existing back yard industry gas fired-boiler is difficult to up to standard；(2) existing back yard industry gas-fired boiler
Stove fails, by itself effective preheated air temperature, to play a part of air preheater, can not also improve boiler thermal output and drop
Low furnace body temperature.
In order to solve above-mentioned technical problem, present invention employs following scheme：
A kind of gas industry boiler smoke recycling denitration and air preheating system, including combustion gas adapter (2), burner
(4) and boiler body (5), the combustion gas of combustion gas adapter (2) conveying pass through the progress in boiler body (5) under burner (4) effect
Burning, the flue gas after burning are exported by the flue gas adapter (3) of boiler body (5), it is characterised in that：Also include flue gas again
Circulation line, the flue gas after burning is delivered in burner (4) again with air mixed combustion, generated so as to suppress NOx by it.
Further, flue gas recirculation pipeline includes the first backflow flue gas pipeline (12) and the second backflow flue gas pipeline (13),
Intelligent flue gas backflow flashboard is provided between first backflow flue gas pipeline (12) one end and second backflow flue gas pipeline (13) one end
(1), second backflow flue gas pipeline (13) other end is connected with burner (4), and first backflow flue gas pipeline (12) other end receives
The flue gas of flue gas adapter (3) output.
Further, in addition to air blower (6), the air blower (6) are arranged on the first backflow flue gas pipeline (12) or second
On backflow flue gas pipeline (13).
Further, flue gas adapter (3) output end is connected by economizer (7) with chimney (8), the first backflow flue gas pipe
Road (12) other end is connected on the flue gas adapter (3), economizer (7) or chimney (8).
Further, in addition to air preheat pipeline, it is preheated to the air of burning using furnace sandwich (9), carried
High boiler inlet temperature, so as to improve boiler thermal output.
Further, air preheat pipeline includes the air inlet grid (10), furnace sandwich (9), the first preheating of boiler body (5)
Air duct (14), intelligent hot air flowrate flashboard (11) and the second preheated air pipeline (15), the outer air of stove pass sequentially through
Air inlet grid (10), furnace sandwich (9), the first preheated air pipeline (14), intelligent hot air flowrate flashboard (11) and second
Preheated air pipeline (15) is entered eventually into burner (4).
Further, the second preheated air pipeline (15) shares an air blower (6) with flue gas recirculation pipeline or individually made
It is connected with an air blower with burner.
Further, with intelligent flue gas backflow flashboard (1) there is following logic control in the intelligent hot air flowrate flashboard (11)
Relation processed：
In control logic, intelligent hot air flowrate flashboard (11) standard-sized sheet (100%) association standard-sized sheet intelligent flue gas backflow flashboard
(1) standard-sized sheet (100%)；
Intelligent hot air flowrate flashboard (11) opens 50%, and intelligent flue gas backflow flashboard (1) 50% is opened in association；
Intelligent hot air flowrate flashboard (11) opens 25%, and intelligent flue gas backflow flashboard (1) 30% is opened in association.
A kind of control logic method between intelligent hot air flowrate flashboard and intelligent flue gas backflow flashboard, including following step
Suddenly：
In control logic, the intelligent standard-sized sheet of hot air flowrate flashboard (11) 100% association standard-sized sheet intelligent flue gas backflow flashboard (1)
100% standard-sized sheet；
Intelligent hot air flowrate flashboard (11) opens 50%, and intelligent flue gas backflow flashboard (1) 50% is opened in association；
Intelligent hot air flowrate flashboard (11) opens 25%, and intelligent flue gas backflow flashboard (1) 30% is opened in association.
The gas industry boiler smoke recycles denitration and air preheating system has the advantages that：
(1) present invention uses flue gas recirculation pipeline, and recovered flue gas is not only participated in burning again reduces combustion zone
Temperature, so as to suppress NOx generations, and recovered flue gas replaces partial air, participates in burning and supplies O2Amount is reduced, and also functions to suppression
NOx is generated.
(2) air preheat pipeline of the present invention can effective preheated air temperature, play a part of air preheater, improve boiler
The thermal efficiency, reduce furnace body temperature.
(3) present invention is by flue gas recirculation pipeline denitration, reduces under the thermal efficiency can cause boiler thermal output simultaneously
Drop, and body of heater preheated air system can improve boiler thermal output, both complement one another, and are not influenceing the premise of boiler thermal output
Under, denitration meet the requirement of environmental protection.
(4) present invention only increases flue gas recirculation pipeline in chimney breast, and the outlet of flue gas recirculation pipeline is located at air blast
At the air inlet duct of machine, change workload simple in construction is small, can be precisely controlled flue gas by intelligent flue gas recirculation (egr) valve and follow again
Circular rector, so as to reach denitration purpose.
(5) air-pre-heating cavity of the present invention is located between body water-cooling wall and boiler jacket interlayer, and air intlet is located at body of heater
On, retrofit work amount is smaller, it is not necessary to additional investment, you can reaches the purpose that preheated air improves boiler thermal output.
Brief description of the drawings
Fig. 1：Gas industry boiler smoke recycling denitration of the present invention and the structural representation of air preheating system；
Fig. 2：Control logic schematic diagram between intelligent hot air flowrate flashboard and intelligent flue gas backflow flashboard in Fig. 1.
Description of reference numerals：
1- intelligent flue gas backflow flashboard；2- combustion gas is taken over；3- flue gases are taken over；4- burners；5- boiler bodies；6- air blast
Machine；7- economizers；8- chimneys；9- furnace sandwich；10- air inlet grids；11- intelligence hot air flowrate flashboards；The backflow cigarettes of 12- first
Feed channel；13- the second backflow flue gas pipelines；14- the first preheated air pipelines；15- the second preheated air pipelines.
Embodiment
With reference to Fig. 1 and Fig. 2, the present invention will be further described：
As shown in figure 1, a kind of gas industry boiler smoke recycling denitration and air preheating system, including combustion gas adapter 2,
Burner 4 and boiler body 5, the combustion gas that combustion gas adapter 2 conveys are burnt under being acted on by burner 4 in boiler body 5,
Flue gas after burning is exported by the flue gas adapter 3 of boiler body 5, it is characterised in that：Also include flue gas recirculation pipeline,
It delivers to the flue gas after burning in burner 4 again with air mixed combustion, is generated so as to suppress NOx.
Flue gas recirculation pipeline includes the first backflow flue gas pipeline 12 and the second backflow flue gas pipeline 13, the first backflow flue gas
Intelligent flue gas backflow flashboard 1, the second backflow flue gas pipeline are provided between the one end of pipeline 12 and the one end of the second backflow flue gas pipeline 13
13 other ends are connected with burner 4, and the other end of the first backflow flue gas pipeline 12 receives the flue gas of the output of flue gas adapter 3.
Also include air blower 6, air blower 6 is arranged on the first backflow flue gas pipeline 12 or the second backflow flue gas pipeline 13.
The output end of flue gas adapter 3 is connected by economizer 7 with chimney 8, and the other end of the first backflow flue gas pipeline 12 is connected to
On flue gas adapter 3, economizer 7 or chimney 8.
Also include air preheat pipeline, it is preheated using furnace sandwich 9 to the air of burning, improves inlet air of boiler
Temperature, so as to improve boiler thermal output.
Air inlet grid 10 of the air preheat pipeline including boiler body 5, furnace sandwich 9, the first preheated air pipeline 14, intelligence
Energy hot air flowrate flashboard 11 and the second preheated air pipeline 15, the outer air of stove pass sequentially through air inlet grid 10, furnace sandwich
9th, the first preheated air pipeline 14, the preheated air pipeline 15 of intelligent hot air flowrate flashboard 11 and second enter eventually into burning
In device 4.
Second preheated air pipeline 15 with flue gas recirculation pipeline share an air blower 6 or be used alone an air blower with
Burner connects.
Closed as shown in Fig. 2 intelligent hot air flowrate flashboard 11 has following logic control with intelligent flue gas backflow flashboard 1
System：
In control logic, the intelligent standard-sized sheet 100% of the hot air flowrate flashboard 11 association standard-sized sheet intelligent flue gas backflow standard-sized sheet of flashboard 1
100%；
Intelligent hot air flowrate flashboard 11 opens 50%, and intelligent flue gas backflow flashboard 150% is opened in association；
Intelligent hot air flowrate flashboard 11 opens 25%, and intelligent flue gas backflow flashboard 130% is opened in association.
Aforementioned proportion relation purpose is established to be：Because boiler normal combustion is, it is necessary to corresponding O2Supply, smoke backflow process
In due to flue gas replace partial air as combustion adjuvant (predominantly normal combustion offer O2), for O2Amount is corresponding to be reduced, thus if
The too conference of backflow flue gas amount causes boiler combustion to supply O2Deficiency, so as to cause to put out a fire when causing boiler combustion unstable serious.
Exemplary description is carried out to the present invention above in conjunction with accompanying drawing, it is clear that realization of the invention is not by aforesaid way
Limitation, it is or not improved by the present invention as long as employing the various improvement of inventive concept and technical scheme of the present invention progress
Design and technical scheme directly apply to other occasions, within the scope of the present invention.
Claims (8)
1. a kind of gas industry boiler smoke recycling denitration and air preheating system, including combustion gas adapter (2), burner (4)
With boiler body (5), the combustion gas of combustion gas adapter (2) conveying under burner (4) effect in boiler body (5) by being fired
Burn, the flue gas after burning is exported by the flue gas adapter (3) of boiler body (5), it is characterised in that：
Also include flue gas recirculation pipeline, its by the flue gas after burning deliver in burner (4) again with air mixed combustion, from
And suppress NOx generations；
He also includes air preheat pipeline, and it is preheated using furnace sandwich (9) to the air of burning, improves boiler
EAT, so as to improve boiler thermal output.
2. the recycling denitration of gas industry boiler smoke and air preheating system according to claim 1, it is characterised in that：Cigarette
Gas recirculating line includes the first backflow flue gas pipeline (12) and the second backflow flue gas pipeline (13), the first backflow flue gas pipeline
(12) intelligent flue gas backflow flashboard (1), the second backflow flue gas pipe are provided between one end and second backflow flue gas pipeline (13) one end
Road (13) other end is connected with burner (4), and first backflow flue gas pipeline (12) other end receives the cigarette of flue gas adapter (3) output
Gas.
3. the recycling denitration of gas industry boiler smoke and air preheating system according to claim 2, it is characterised in that：Also
Including air blower (6), the air blower (6) is arranged on the first backflow flue gas pipeline (12) or the second backflow flue gas pipeline (13)
On.
4. the recycling denitration of gas industry boiler smoke and air preheating system, its feature exist according to Claims 2 or 3
In：Flue gas adapter (3) output end is connected by economizer (7) with chimney (8), first backflow flue gas pipeline (12) other end
It is connected on the flue gas adapter (3), economizer (7) or chimney (8).
5. denitration and air preheating system are recycled according to gas industry boiler smoke any one of claim 1-4,
It is characterized in that：Air preheat pipeline includes air inlet grid (10), furnace sandwich (9), the first preheated air of boiler body (5)
Pipeline (14), intelligent hot air flowrate flashboard (11) and the second preheated air pipeline (15), the outer air of stove pass sequentially through air inlet
Grid (10), furnace sandwich (9), the first preheated air pipeline (14), intelligent hot air flowrate flashboard (11) and the second preheating
Air duct (15) is entered eventually into burner (4).
6. the recycling denitration of gas industry boiler smoke and air preheating system according to claim 5, it is characterised in that：The
Two preheated air pipelines (15) share an air blower (6) with flue gas recirculation pipeline or an air blower and burner are used alone
Connection.
7. denitration is recycled according to the gas industry boiler smoke of claim 6 or 7 and air preheating system, its feature exist
In：Following logic control relation be present with intelligent flue gas backflow flashboard (1) in the intelligent hot air flowrate flashboard (11)：
In control logic, the intelligent standard-sized sheet of hot air flowrate flashboard (11) 100% association standard-sized sheet intelligent flue gas backflow flashboard (1)
100% standard-sized sheet；
Intelligent hot air flowrate flashboard (11) opens 50%, and intelligent flue gas backflow flashboard (1) 50% is opened in association；
Intelligent hot air flowrate flashboard (11) opens 25%, and intelligent flue gas backflow flashboard (1) 30% is opened in association.
8. a kind of control logic method between intelligent hot air flowrate flashboard and intelligent flue gas backflow flashboard, comprises the following steps：
In control logic, the intelligent standard-sized sheet of hot air flowrate flashboard (11) 100% association standard-sized sheet intelligent flue gas backflow flashboard (1)
100% standard-sized sheet；
Intelligent hot air flowrate flashboard (11) opens 50%, and intelligent flue gas backflow flashboard (1) 50% is opened in association；
Intelligent hot air flowrate flashboard (11) opens 25%, and intelligent flue gas backflow flashboard (1) 30% is opened in association.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710839557.8A CN107461736A (en) | 2017-09-18 | 2017-09-18 | A kind of gas industry boiler smoke recycling denitration and air preheating system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710839557.8A CN107461736A (en) | 2017-09-18 | 2017-09-18 | A kind of gas industry boiler smoke recycling denitration and air preheating system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107461736A true CN107461736A (en) | 2017-12-12 |
Family
ID=60552763
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710839557.8A Pending CN107461736A (en) | 2017-09-18 | 2017-09-18 | A kind of gas industry boiler smoke recycling denitration and air preheating system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107461736A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151016A (en) * | 2017-12-18 | 2018-06-12 | 温岭市华瑞热能设备制造有限公司 | A kind of multistage mutual interference smoke backflow surpasses low NO |
| CN112628725A (en) * | 2021-01-12 | 2021-04-09 | 哈尔滨工业大学 | Radial grading low NOx pulverized coal combustion device |
| CN112728527A (en) * | 2020-12-31 | 2021-04-30 | 宁波明州热电有限公司 | Boiler combustion system |
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| CN205746935U (en) * | 2016-05-31 | 2016-11-30 | 乌鲁木齐华源热力股份有限公司 | A kind of flue gas recirculation structure reducing gas fired-boiler burner hearth NO_x formation |
| CN207214029U (en) * | 2017-09-18 | 2018-04-10 | 北京富士特锅炉有限公司 | A kind of gas industry boiler smoke recycling denitration and air preheating system |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108151016A (en) * | 2017-12-18 | 2018-06-12 | 温岭市华瑞热能设备制造有限公司 | A kind of multistage mutual interference smoke backflow surpasses low NO |
| CN112728527A (en) * | 2020-12-31 | 2021-04-30 | 宁波明州热电有限公司 | Boiler combustion system |
| CN112628725A (en) * | 2021-01-12 | 2021-04-09 | 哈尔滨工业大学 | Radial grading low NOx pulverized coal combustion device |
| CN112628725B (en) * | 2021-01-12 | 2021-11-12 | 哈尔滨工业大学 | Radial grading low NOx pulverized coal combustion device |
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Application publication date: 20171212 |
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