CN204829893U - Low nox combustion system - Google Patents
Low nox combustion system Download PDFInfo
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- CN204829893U CN204829893U CN201520545104.0U CN201520545104U CN204829893U CN 204829893 U CN204829893 U CN 204829893U CN 201520545104 U CN201520545104 U CN 201520545104U CN 204829893 U CN204829893 U CN 204829893U
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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 provides a low NOx combustion system, includes: fire the burning furnace main part, be used for anoxycausis and oxygen boosting burning for primary zone, reducing zone and postcombustion district in proper order in its furnace, the air feed system is including air nozzle and after -flame wind spout, is provided with after -flame wind spout in the upside of air nozzle. This low NOx combustion system can carry out rich fuel anoxycausis, reaches the purpose that reduces NOx and discharge.
Description
Technical field
The utility model relates to burner technical field, more particularly, and particularly a kind of low NOx combustion system.
Background technology
Combustion furnace of the prior art is all generally using coal as fuel, containing a large amount of nitrogen oxide in the flue gas generated, is very easy to the pollution causing environment after coal combustion.
In order to solve the pollution problem of flue gas, traditional method adopts water or liquid to carry out gas washing operation to flue gas, although can eliminate part nitrogen oxide like this, owing to will change a liquid every one section time, can increase production cost.In addition, adopt gas washing mode to eliminate nitrogen oxide, the clean-up effect of flue gas still has much room for improvement.
Utility model content
(1) technical problem
How to reduce the content of nitrogen oxides in effluent.
(2) technical scheme
The utility model provides a kind of low NOx combustion system, comprising:
Combustion furnace main body, in described combustion furnace main body, there is burner hearth, described burner hearth is followed successively by primary zone, reducing zone and intermediate zone from bottom to top, is provided with coal burner for anoxycausis in described primary zone, and described intermediate zone is provided with and is separated burnout degree burner for oxygen-enriched combusting;
Air feed system, described air feed system includes air nozzle and fire air nozzle, and described air nozzle adopts hierarchy, and the upside of described air nozzle is provided with described fire air nozzle.
Preferably, also denitrification apparatus is included in the low NOx combustion system provided at the utility model;
Described denitrification apparatus includes the first tank body for splendid attire urea, the second tank body for splendid attire ammoniacal liquor, nozzle, control valve and flow pipe, described nozzle includes urea nozzle and ammonia spray nozzle, described first tank body is connected with described urea nozzle by described flow pipe, described second tank body is connected with described ammonia spray nozzle by described flow pipe, on described flow pipe, be provided with described control valve.
Preferably, steam delivery apparatus is also included in the low NOx combustion system provided at the utility model;
The steam that described steam delivery apparatus includes for steam circulation dredges pipe, and described steam is dredged pipe and is arranged on described coal burner.
Preferably, in the low NOx combustion system provided at the utility model:
Described air nozzle comprises First air spout, overfire air port;
Specifically being set to of described First air spout, described overfire air port and described fire air nozzle:
Layout two leafing burnout degree is increased above described coal burner;
Be arranged on described coal burner on each corner corresponding thereto work seven layers of air nozzle are set, wherein having two-layer is First air spout, three layers of overfire air port.
(3) beneficial effect
In the utility model:
The low NOx combustion system that the utility model provides, is designed by said structure, and this combustion system carries out fuel-rich material anoxycausis in primary zone, so overheavy firing can reduce the NOx generated simultaneously, reach the object reducing NOx emission.
Accompanying drawing explanation
Fig. 1 is the structural representation of low NOx combustion system in the utility model embodiment;
In FIG, the corresponding relation of component names and accompanying drawing number is:
Combustion furnace main body 1, coal burner 2, separation burnout degree burner 3, first tank body 4, second tank body 5, nozzle 6, primary zone a, reducing zone b, intermediate zone c.
Detailed description of the invention
Below in conjunction with drawings and Examples, embodiment of the present utility model is described in further detail.Following examples for illustration of the utility model, but can not be used for limiting scope of the present utility model.
In description of the present utility model, except as otherwise noted, the implication of " multiple " is two or more; Term " on ", D score, "left", "right", " interior ", " outward ", " front end ", " rear end ", " head ", the orientation of the instruction such as " afterbody " or position relationship be based on orientation shown in the drawings or position relationship, only the utility model and simplified characterization for convenience of description, instead of the device of instruction or hint indication or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as restriction of the present utility model.In addition, term " first ", " second ", " the 3rd " etc. only for describing object, and can not be interpreted as instruction or hint relative importance.
In description of the present utility model, it should be noted that, unless otherwise clearly defined and limited, term " is connected ", " connection " should be interpreted broadly, such as, can be fixedly connected with, also can be removably connect, or connect integratedly; Can be mechanical connection, also can be electrical connection; Can be directly be connected, also indirectly can be connected by intermediary.For the ordinary skill in the art, concrete condition the concrete meaning of above-mentioned term in the utility model can be understood.
The low NOx combustion method that the utility model provides mainly adopts recirculating zone steam to spray low-NOx pulverized coal burner plus depth classification high efficency low NOx combustion system.
According to situations such as conventional at present 75t/h boiler burning coal, pulverized coal preparation system form, arrangement of burner, transformation target and the reconstruction scope conditions, the transformation of the utility model 75t/h boiler low-NOx combustor is recommended to adopt recirculating zone steam to spray low-NOx pulverized coal burner plus depth graded low-NOx burning system.Stable, the requirement that economy, NOx emission are low of boiler combustion is reached by low NOx combustion system transformation.
The improvement and design of the utility model low NOx combustion system, will based on existing pulverized coal preparation system, blowing system and blowing device condition, improved low nitrogen burning system adapts to Coal rank, and in improvement and design process, utilizes existing combustion system equipment as far as possible.
From heating power NOx formation condition, only have and oxidation reaction generation NOx could occur under the high temperature conditions, when temperature is low dry 1200 DEG C, NOx just not easily generates.Burner hearth flame peak surface temperature is the highest, can reach 1400 DEG C, is the main cause generating NOx, if can reduce flame front surface temperature, NOx just can be suppressed to generate.Utilize this point, the utility model low NOx grading bamboo combustion method proposes the new method spraying into a small amount of steam suppression NOx in the flame of pulverized coal friring.
Under high temperature condition, fine coal is met steam and is produced the water-gas endothermic reaction, the gaseous fuel H that the endothermic reaction produces
2and CO, reduce flame front surface temperature; H
2have very high activity with CO, chance oxygen burns again and generates H
2o and CO
2, the heat of absorption is returned flue gas again, and energy does not lose, but the water-gas endothermic reaction has been put down strongly fragrant flame front surface temperature, form again the anaerobic environment in flame front face, both play the carrying out of the reaction that inhibit nitrogen and oxygen.
Due to bluff body burner spray into steam after can there is water gas reaction, generate CO and H
2, can effectively suppress NO to generate and reductive NO, H
2have very high activity with CO, chance oxygen burns again and generates H
2o and CO
2, the heat of absorption is returned flue gas again, and energy does not lose, but the water-gas endothermic reaction has been put down strongly fragrant flame front surface temperature, form again the anaerobic environment in flame front face, both play the carrying out of the reaction that inhibit nitrogen and oxygen.This shows it significantly can reduce NOx further on the basis of air classification technology.
Combustion apparatus transformation integral arrangement: adopt Terms of Corner Tangential Combustion, original burner centre absolute altitude and burner framework substantially constant, coal burner divides two-layer, full stove is totally eight coal burners, primary and secondary air adopts former design geometry circle of contact Φ 800, First air nozzle pitch is arranged, coal burner adopts recirculating zone steam to spray low-NOx pulverized coal burner and side secondary air is arranged.
For preventing burner hearth coking, reduce burner region thermic load, First air nozzle pitch is arranged and is arranged side secondary air.
For reducing NOx emission, above main burner, increasing layout one group (two layers) be separated burnout degree (SOFA); After transformation, seven layers of spout arranged altogether by every angle burner, wherein have two-layer First air spout, three layers of overfire air port, two-layer fire air nozzle (SOFA1, SOFA2).
Adopt deep-graded high efficency low NOx combustion system, increase layout one group (two layers) by side on the burner and be separated burnout degree (SOFA1, SOFA2) burner, become at freeze profile: primary zone, reducing zone and intermediate zone (i.e. burning-out zone).Thus anoxycausis reduces and controls NOx emission under initial rich fuel condition, top oxygen-enriched combusting controls unburned carbon in flue dust.Be separated burnout degree and choose higher wind speed, be conducive to reducing boiler flyash carbon content, the later stage mixing of strengthening stove combustion.The separation burnout degree (SOFA) of deep-graded will be arranged in distance primary combustion zone position far away as far as possible, and it arranges the impact being highly also subject to carbon after-flame.According to design experiences and on-site actual situations, get around barrier etc. as far as possible, as buckstay etc.SOFA1 spout absolute altitude will be arranged in apart from Secondary Air burner 2500mm place, upper strata, SOFA1 and SOFA2 distance between center line 800mm, and adopt the method for numerical simulation to be optimized.
First and second wind snout redesigns according to new air distribution parameter, the design parameter of burner is all chosen by combustion retrofit ature of coal, burner region overfire air port area carries out corresponding reducing according to the main burner district situation that Secondary Air reduces in a organized way, for the easy coking property of burning coal, arranged by side secondary air, be conducive to forming bellows chamber powder pattern, to prevent the generation of water-cooling wall slagging scorification and high temperature corrosion accident, be conducive to preventing water screen tube overtemperature tube burst simultaneously.Side two wind forms air classification in cross-sectional direction, can reduce NOx emission, and mainly the initial stage of setting up catches fire and controls the fuel/air mixture staged combustion process of oxygen amount for it.
In coal-fired boiler NOx discharge, fuel type NOx discharge accounts for more than 80% ~ 85% of total NOx discharge, and it is reacted by the nitrogen in fuel and oxygen to generate.The part that first fuel bound nitrogen in coal separates out with volatile matter when being heated is called as volatile matter nitrogen, and the part separated out in coke combustion is afterwards called coke nitrogen.If there is hydrocarbon (CHi) in volatile matter, will immediately the volatile matter NOx generated be reduced.And coke nitrogen is separated out in fuel combustion later stage coke combustion, majority is oxidized to NOx, and is difficult to control.The ratio being converted into volatile matter nitrogen due to fuel bound nitrogen is larger, and the easier Volatile at coal dust and stage of catching fire, by controlling the concentration of oxygen, form the generation that reducing atmosphere (CHi) carrys out control NOx.Therefore, overheavy firing, promotes Volatile, controls the oxygen concentration in primary combustion zone simultaneously, just can effectively control total NOx generation amount.
Generate and the analysis of reduction mechanism based on NOx, reduce the generation of NOx, first overheavy firing is answered, impel fugitive constituent to separate out as early as possible, as far as possible, and the concentration controlling oxygen in primary combustion zone while overheavy firing reduce the NOx that generated thus reach the object of reduction NOx emission to generate reducing medium (CHi).Top oxygen-enriched combusting controls unburned carbon in flue dust, is separated burnout degree and chooses higher wind speed, is conducive to reducing boiler flyash carbon content, the later stage mixing of strengthening stove combustion.
The utility model adopts SNCR flue-gas denitration process, and urea or ammoniacal liquor are denitrification reducing agent.
SNCR technique is the denitrification process after a burning, and in 850 ~ 1150 DEG C of temperature ranges, key reaction is:
Ammoniacal liquor is reducing agent, 4NH3+4NO+O2 → 4N2+6H2O; Urea is reducing agent, 2NO+CO (NH2) 2+1/202 → 2N2+CO2+2H2O.
This technique has that cost of investment is low, operating cost is low, product nontoxic pollution-free, the feature of no coupling product discharge.
Different reducing agent has different range of reaction temperature, and this temperature range is called temperature window.The reaction optimum temperature district of urea is 870 ~ 1150 DEG C.When reaction temperature is too high, the decomposition due to ammonia can make NOX percent reduction reduce, and on the other hand, when reaction temperature is too low, the escape of ammonia increases, and NOX percent reduction also can be made to reduce.
Reactant utilization rate weighs the index of reactant producing level, and the parameter of it and NOX removal efficiency available standards stoichiometric ratio (NSR) is weighed.NSR is defined as follows:
Relation between the actual mol ratio/reactant of NSR=reactant and entrance NOX and the nonstoichiometric molar ratio reactant utilization rate of entrance NOX, NSR and NOX removal efficiency is as follows:
Reactant utilization rate (%)=NOX removal efficiency (%)/NSR
SNCR technique and the design variable of result of performance test association have:
◆ NOX reduces (reduction of discharging) rate, from design baseline value or to drop to target level;
◆ the mol ratio (NSR) of reactant and NOX;
◆ reach the maximum reactant flow of NOX reduction needed for (reduction of discharging) rate;
◆ maximum NH3 escapes;
Adopt SNCR technique must possess following necessary condition:
◆ mechanical system, comprises equipment reasonable in design, such as reactant storage, metering, distributor, ejection assemblies, monitoring and controlling device etc.;
◆ the chemical reactor of special properties;
◆ application project comprises rational installation, debugging and maintenance.
As long as there is " SNCR reaction temperature window ", SNCR technique can be applicable to burn the boiler of various types of various fuel.Because SNCR is flue gas treating process after burning, the size of burner, type and fuel type do not have considerable influence to SNCR technique.This technique is succeeded checking on the burner being fuel with coal, oil, natural gas, wooden waste, municipal solid waste or dangerous garbage.Size and the pattern of these burners are different, comprise packaged boiler, process heaters, refuse incinerator, circulation or bubbling fluidized bed, waste heat boiler and station boiler etc.Therefore, SNCR can be applied to nearly all burner, its NOX is discharged and meets or exceed most NOX emission request.
In order to obtain high NOX reduction efficiency and be dropped to by the escaping of ammonia minimum, following condition should be met:
1. the reduction reaction agent with strong penetration capacity and reasonable drop size fully distributes, with the NOX good mixing in flue gas.
2. can maintain proper temperature scope in reaction zone.
3. can obtain enough time of staying in reaction zone.
4. there is the robot control system(RCS) of following load variations sensitivity of good response characteristic.
The ammonia of escaping from SNCR system may from two kinds of situations, and one is owing to spraying into the low reaction that have impact on ammonia and NOX of a flue-gas temperature; Another kind may be the excessive or reducing agent skewness of the reducing agent that sprays into.Reducing agent sprays into system must be injected to the most effective position in stove by reducing agent, because NOX is distributed in flue to flow section being often change, if spray into control point very little or the ammonia be sprayed onto in stove on certain section uneven, then there will be the amount of ammonia slip that distribution is higher.For ensureing that denitration reaction can carry out fully, reach best reduction effect with the minimum NH3 amount that sprays into, the NH3 that must manage to make to spray into mixes well with flue gas.If the insufficient reaction of the NH3 sprayed into, then the NH3 escaped not only causes waste but also discharge to reach in air and also result in secondary pollution, and therefore, the escape ammonia general control of SNCR technique is at 8mg/Nm
3below.
SNCR gas denitrifying technology denitration efficiency is generally 40% ~ 70%.
Key equipment of the present utility model, with modularization integration, mainly contains high flow capacity conveyor module, dilution metering module and distribution module.These modules complete assembling and test at my Company plants, have both ensured the installation quality of equipment in module, instrument, valve, and have farthest reduced in-site installation, debugging work load again, shorten installation period.
The drop size that the utility model adopts twin spray gun structure uniquely that spray gun is produced is little, be evenly distributed, penetration is strong, ensure that reducing agent can with fully the contacting of NOX in flue gas, thus obtain higher denitration efficiency and lower the escaping of ammonia rate.The experienced spray gun mounting means of supplier ensures not occur that palpus phenomenon hung by reducing agent.
The utility model adopts the urea liquid of 10% concentration to be denitrification reducing agent, designs 1 urea dissolving tank and 1 urea liquid storage tank denitrification apparatus carries out reducing agent public domain.
Capital equipment
(1) reducing agent preparation facilities
Urea dissolving tank
Urea dissolving tank adopts 304 stainless steel manufactures.Container is dished base part, Vertical Steel Oil Tank non-pressure vessel.A complete set of manhole, urea granules entrance, urea liquid outlet, ventilating opening, agitator mouth, content gauge, thermometer mouth and floss hole etc. are set in tank body.
Demineralized water storage tank
Demineralized water storage tank adopts 304 stainless steel manufactures, for arranging magnetic flap level gauge, ball-cock assembly, and 6 hours supplys.
Urea liquid storage tank
A urea liquid storage tank is set, adopts 304 stainless steel manufactures, meet the requirement of 5 days denitrating system consumptions.
Storage tank should be taked electrical heating or steam tracing and carry out Insulation.For avoiding overvoltage or vacuum in tank, tank deck installs breather valve.Storage tank establishes liquid level, temperature, pressure monitoring, is realized on the spot and long-range continuous monitoring by fluid level transmitter.
Urea liquid conveying device
Urea liquid transfering conveying device is used for 50% urea liquid prepared in dissolving tank to be transported in urea storage tank, and this device arranges 2 urea liquid delivery pumps, the using and the reserved.Flow 10m3/h.
(2) transport metering mechanism
Be incorporated in a steel cabinet for the equipment carried and measure urea liquid.The urea liquid of the necessary quantity required by NOx controller is by this device provisioning.Required urea liquid flow is controlled by flowmeter, control valve regulates.Each spray site controls by flowmeter, guarantees to distribute suitably.The pressure of reducing agent mixed liquor is controlled by the pressure gauge installed.
(3) air mix facilities
Air mix facilities is mainly applicable to for diluting urea concentration when boiler at low load runs, to ensure rigidity and the coverage of injection.Air mix facilities is made up of measuring pump, flowmeter etc., carries out dilution mixture by static mixer and urea stoste.
(4) distributor
Distributor adopts independent dispensing branch, for being accurately assigned to the reducing agent and compressed-air actuated pressure and flow that often prop up injector, comprises the equipment such as magnetic valve, control valve, pressure, flow instrument.
(5) injection apparatus
Reductant injection system adopts compressed air reducing agent atomization to be sprayed in high-temperature flue gas.Spray gun material should meet operating condition requirement: this project spray gun is installed on boiler top opening horizontal flue, and this condition of work is that dust concentration is high, and flue gas flow rate is large, and flue-gas temperature is high, and nozzle selects high temperature resistant 316L steel alloy; Spray gun outer sheath tube also arranges protection and purges sleeve pipe to prevent spray nozzle clogging and flying dust erosion, and protective casing adopts 310 to make.For urea liquid spray gun, D32 general control is at about 80 μm, and maximum particle diameter controls within 100 μm, and even particle size distribution.
Two-fluid spray gun atomization is as follows: spray gun is installed on the flue of boiler top, and spray gun quantity is 6.
Please refer to Fig. 1, Fig. 1 is the structural representation of low NOx combustion system in the utility model embodiment.
The low NOx combustion system that the utility model provides, comprise: combustion furnace main body 1, in combustion furnace main body 1, there is burner hearth, burner hearth is followed successively by primary zone a, reducing zone b and intermediate zone c from bottom to top, be provided with coal burner 2 for anoxycausis in primary zone a, intermediate zone c is provided with and is separated burnout degree burner 3 for oxygen-enriched combusting; Air feed system, air feed system includes air nozzle and fire air nozzle, and air nozzle adopts hierarchy, and the upside of air nozzle is provided with fire air nozzle.
Designed by said structure, this combustion system can utilize above-mentioned combustion method, carries out fuel-rich material anoxycausis at primary zone a, so overheavy firing can reduce the NOx generated simultaneously, reach the object reducing NOx emission.
In order to reduce the content of nitrogen oxides in effluent further, in the low NOx combustion system that the utility model provides, also include denitrification apparatus; Denitrification apparatus includes the first tank body 4 for splendid attire urea, the second tank body 5 for splendid attire ammoniacal liquor, nozzle 6, control valve and flow pipe, nozzle 6 includes urea nozzle and ammonia spray nozzle, first tank body 4 is connected with urea nozzle by flow pipe, second tank body 5 is connected with ammonia spray nozzle by flow pipe, on flow pipe, be provided with control valve.
By to the transformation of boiler low nitrogen burning, adopt recirculating zone steam to spray low-NOx pulverized coal burner+deep-graded high efficency low NOx combustion system, after transformation, expection realizes:
1, emission of NOx of boiler amount≤320mg/Nm3 (O2=6%).
2, boiler efficiency reaches the front benchmark test value of transformation.
3, boiler operatiopn is stable, economical, and boiler output and primary operating parameter reach design load.
4, there is not the phenomenons such as serious coking and high temperature corrosion in burner hearth.
5, boiler fired coal adaptability is strengthened.
According to modification scheme, involved low NOx combustion system the reconstruction scope is as follows
Embodiment of the present utility model provides for the purpose of example and description, and is not exhaustively or by the utility model be limited to disclosed form.Many modifications and variations are apparent for the ordinary skill in the art.Selecting and describing embodiment is in order to principle of the present utility model and practical application are better described, and enables those of ordinary skill in the art understand the utility model thus design the various embodiments with various amendment being suitable for special-purpose.
Claims (4)
1. a low NOx combustion system, is characterized in that, comprising:
Combustion furnace main body (1), in described combustion furnace main body, there is burner hearth, described burner hearth is followed successively by primary zone (a), reducing zone (b) and intermediate zone (c) from bottom to top, be provided with coal burner (2) in described primary zone for anoxycausis, described intermediate zone is provided with and is separated burnout degree burner (3) for oxygen-enriched combusting;
Air feed system, described air feed system includes air nozzle and fire air nozzle, and described air nozzle adopts hierarchy, and the upside of described air nozzle is provided with described fire air nozzle.
2. low NOx combustion system according to claim 1, is characterized in that,
Also include denitrification apparatus;
Described denitrification apparatus includes the first tank body (4) for splendid attire urea, the second tank body (5) for splendid attire ammoniacal liquor, nozzle (6), control valve and flow pipe, described nozzle includes urea nozzle and ammonia spray nozzle, described first tank body is connected with described urea nozzle by described flow pipe, described second tank body is connected with described ammonia spray nozzle by described flow pipe, on described flow pipe, be provided with described control valve.
3. low NOx combustion system according to claim 1, is characterized in that,
Also include steam delivery apparatus;
The steam that described steam delivery apparatus includes for steam circulation dredges pipe, and described steam is dredged pipe and is arranged on described coal burner.
4. low NOx combustion system according to claim 1, is characterized in that,
Described air nozzle comprises First air spout, overfire air port;
Specifically being set to of described First air spout, described overfire air port and described fire air nozzle:
Layout two leafing burnout degree is increased above described coal burner;
Be arranged on described coal burner on each corner corresponding thereto work seven layers of air nozzle are set, wherein having two-layer is First air spout, three layers of overfire air port.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003912A (en) * | 2015-07-24 | 2015-10-28 | 湖南高华环保股份有限公司 | Low-NOx combustion method and low-NOx combustion system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105003912A (en) * | 2015-07-24 | 2015-10-28 | 湖南高华环保股份有限公司 | Low-NOx combustion method and low-NOx combustion system |
| CN105003912B (en) * | 2015-07-24 | 2017-10-27 | 湖南高华环保股份有限公司 | Low nox combustion method and low nox combustion system |
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