CN208244426U - A kind of efficient NOx control device of biomass boiler - Google Patents
A kind of efficient NOx control device of biomass boiler Download PDFInfo
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- CN208244426U CN208244426U CN201820119216.3U CN201820119216U CN208244426U CN 208244426 U CN208244426 U CN 208244426U CN 201820119216 U CN201820119216 U CN 201820119216U CN 208244426 U CN208244426 U CN 208244426U
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- biomass boiler
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Abstract
The utility model relates to a kind of efficient NOx control devices of biomass boiler, which includes biomass boiler, and the biomass boiler is provided with chimney arch, are provided with SNCR denitrification spray gun above the chimney arch；Boiler reversal chamber is connected in the biomass boiler；Reducing agent storage bin is connected with reducing agent transfer pump, the reducing agent transfer pump passes through the first metered dispensing unit respectively and is connected with the SNCR denitrification spray gun, supplements spray gun with the denitrification reducing agent for being located at boiler reversal chamber side by the second metered dispensing unit and is connected；The boiler reversal chamber is connected by pipeline with the SCR reactor, is provided with catalyst layer in the SCR reactor；The SCR reactor is connected with deduster, and the deduster is connected by air-introduced machine with chimney；Air blower is installed to be connected with the biomass boiler between the air-introduced machine and the chimney.The control device NOx removal of the utility model is high-efficient, and flexible operation is convenient for safeguarding.
Description
Technical field
The utility model relates to field of energy source environment protection more particularly to a kind of efficient NOx control devices of biomass boiler.
Background technique
Biomass boiler is with agricultural crop straw (corn stalk, sorghum stalks, wheat straw, straw, beanstalk and cotton stalk), agricultural machining
The biomass energies such as the waste (rice husk) of industry make the boiler of fuel.Biomass energy feature is that renewable, low pollution, distribution are wide
General, total amount is enriched.Biomass boiler, which discharges in flue gas, contains a certain amount of nitrogen oxides (NOx), as country is to boiler smoke
The raising of environmental protection standard is discharged, biomass boiler has been not suitable with new environmental requirement, has needed to carry out NOx improvement；Meanwhile biology
Matter boiler is different from traditional coal-burning boiler, and conventional denitration mode encounters problems when directly applying to biomass boiler,
Need high efficiency method and device that exploitation is suitable for biomass boiler NOx control.
Biomass boiler flue gas has the characteristics that following:
(1) in-furnace temperature difference is big.Biomass boiler mainly has grate furnace and Circulation fluidized-bed furnace, and every kind of type of furnace is divided into again
Medium temperature and medium pressure furnace, secondary high temperature sub-high pressure furnace, high temperature and pressure furnace, fire box temperature are respectively 700~760 DEG C, 800~950 DEG C, 850
~1100 DEG C；
(2) nitrogen in biomass mainly exists in the form of the organic nitrogens such as protein, free amino acid, while also
Part inorganic nitrogen, therefore the NOx of biomass combustion generation is mainly derived from the oxidation reaction of organic nitrogen.Biomass boiler burning produces
Raw NOx type is mainly fuel type NOx.
(3) nitrous oxides concentration is low but fluctuation is big.Sulfur dioxide when pure biomass of burning, amount of nitrogen oxides 100~
250mg/m3Between fluctuate, such as template, timber, bark are adulterated in fuel, sulfur dioxide in flue gas, amount of nitrogen oxides can be
250~600 mg/m3Between fluctuate, instantaneously may be higher；
(4) exhaust gas dust content is big, and alkali metal content is high.Lime-ash ratio after biomass combustion at (10:0 ~ 8:2), due to
Burning, dust size is small, and big two reasons of specific resistance, biomass fired boiler dedusting is only suitable for sack cleaner, and bulk density is general
In 0.18-0.5t/m3.The ingredient of biomass combustion dust has K2SO4, KCl and K2CO3, concentration of emission is generally in 200mg/m3It is left
It is right；Alkali metal content is high in dust, up to 8% or more；
(5) humidity of flue gas is high.Protium content is higher in biomass, causes moisture content in flue gas also high, can reach 15%
~30% or so, and fire coal boiler fume moisture content does not exceed 10%；
(6) the easy second-time burning of flue dust in flue gas, easy coking of burning.Due to biomass cannot in furnace completely burned, in cigarette
Also due to oxygen content cannot not enough burn again in road, larger dust can remain burning temperature since flue gas heat exchanger time is very short
Degree, so once having in oxygen condition, for example is placed in air and can burn again.Ash after incineration contains the substances such as tar,
Once equipment temperature reduces, it is possible to generate coking phenomenon, result in blockage phenomenon, due to consideration that boiler coke and corrosion are asked
Topic, exhaust gas temperature may be at 160-190 DEG C.
It is as follows to control major technique by boiler smoke NOx at present:
(1) low-NO_x combustion technology
Using flue gas recirculation low-NO_x combustion technology, the flue gas after boiler combustion is led back into a part feeding boiler again and is sent
Fans entrance optimizes combustion flame temperature, reduces the generation of nitrogen oxides by adjusting the oxygen content in combustion air.
(2) SNCR denitration technology
SNCR technology (selective non-catalytic reduction) is by reaction temperature, reducing agent and flue gas mixed effect, residence time etc.
Factor influences.Recommendation response temperature is 800~1100 DEG C (reducing agent difference optimal reaction temperature is slightly different), is higher or lower than
Denitration efficiency declines when this temperature range, meanwhile, reducing agent and flue gas mixing effect have a significant impact to denitration efficiency, when stop
Between meet denitration requirement.It such as mixes the uneven, reaction time not enough or temperature is undesirable, will lead to denitration efficiency decline, reducing agent
A series of problems, such as consumption increases, and the escaping of ammonia increases.SO in biomass boiler flue gas3Content is often higher, and the escaping of ammonia increases meeting
The problems such as causing upstream device blocking, corrosion.
(3) SCR denitration technology
SCR technology (selective catalytic reduction) is made in reducing agent and flue gas by the way that reducing agent (such as ammonia) is added into flue gas
NOx react under the action of catalyst, generate the N2 and H2O of environmental sound.Catalyst is the core equipment of the reaction,
Under the premise of Flow Field Distribution is uniform, catalyst performance has decisive influence to denitration effect.Influence the main of catalyst performance
Factor includes catalyst structure and component, physics inactivation (dust stratification, abrasion), chemical inactivation (poisoning) etc..SCR gas denitrifying technology
With its high denitration efficiency, mature application experience and relatively inexpensive cost, become the mainstream work of current coal steam-electric plant smoke denitration
Skill.
In view of biomass boiler work characteristics and flue gas characteristic, there are reducing agents to mix in burner hearth for the design of conventional SNCR denitration
Close insufficient, the residence time is limited in effecting reaction temperature window, is unable to fully reaction, denitration efficiency low (30% or so) etc.
Problem；Conventional scr denitration design, which has easily blocking, catalyst, is influenced easy in inactivation etc. by alkali metal, moisture content height etc. in flue gas
Problem.Above-mentioned series of problems seriously affects the NOx control effect of biomass boiler, while the flexibility of denitration facility is insufficient, conventional
Denitration design has the matching of biomass boiler to be hoisted.
Utility model content
It is timely, easy to operate that the technical problems to be solved in the utility model is to provide a kind of high efficient and reliable, response, application
It has a extensive future, the efficient NOx control method of biomass boiler with good economic benefit and environmental benefit.
In order to solve the above-mentioned technical problem, the technical solution adopted in the utility model is: the efficient NOx control of the biomass boiler
Method processed, using low nitrogen burning and denitrating flue gas associated form, low nitrogen burning uses flue gas recirculation, and denitrating flue gas uses SNCR
Bis- denitration, SCR denitrations, comprising the following steps:
(1) flue gas secondary combustion: part neat stress is sent into biomass boiler and carries out second-time burning；
(2) denitrations: the NOx that biomass combustion generates in the step (1) is de- using SNCR in biomass boiler
Nitre technique, reducing agent are atomized into droplet, are mixed, are occurred with the high-temperature flue gas in the biomass boiler in the step (1)
Redox reaction carries out a denitration；
(3) secondary denitration: the flue gas after the SNCR denitration in the step (2) is supplemented by denitrification reducing agent again to be sprayed
Rifle supplements reducing agent in boiler reversal chamber, and after reducing agent is mixed with flue gas, selective catalysis occurs also under the effect of the catalyst
Original reaction；
(4) flue gas after denitration enters downstream installation, most enters smoke stack emission after air-introduced machine is pressurized afterwards；
Urea or ammonium hydroxide may be selected in the reducing agent.
By adopting the above technical scheme, part neat stress is fed again into biomass boiler and carries out second-time burning, NOx control is adopted
With denitration of low nitrogen burning+SNCR() two denitrations of+SCR() collaboration technique, NOx removal is high-efficient, flexible operation, convenient for dimension
Shield, low nitrogen burning part NOx abatement efficiency about 20%, SNCR denitration efficiency about 60%, SCR denitration efficiency up to 85%, imitate by NOx removal
Rate is high；Can have good economic benefit and environmental benefit with biomass boiler burning feature matched, high efficient and reliable.
The utility model further improvement lies in that, in the step (2), close to biomass boiler chimney arch, close to
Above flame, sprinkling is atomized into the reducing agent of droplet；Using the low feature of biomass flame intensity, guarantee that SNCR is anti-to greatest extent
Required room and time is answered, denitration efficiency is promoted.
The utility model further improvement lies in that, in the step (3), catalyst is below big using 18 holes and 18 holes
Soot blower is arranged in pore catalyst or board-like catalyst, catalyst layer top.
For the dust stratification clogging occurred under reply harsh conditions, SCR reactor upstream entrance section is provided with pre- dedusting
Shock wave soot blower is arranged while conventional steam soot blower or acoustic wave ash ejector is arranged in device, SCR reactor catalysis oxidant layer top, from
Fundamentally solve dust stratification blockage problem.
It is high-efficient that another problem to be solved in the utility model is to provide a kind of NOx removal, flexible operation, convenient for dimension
The efficient NOx control device of the biomass boiler of shield, which includes biomass boiler, and the biomass boiler is provided with furnace
Arch, is provided with SNCR denitrification spray gun above the chimney arch, and the SNCR denitrification spray gun is opened using fixed spray gun and tape travel
Spray gun combination configuration is closed, by different types spray gun combinations matches, it can be achieved that single-sided arrangement, overcomes live boiler to frequently encounter
Arrangement space limitation problem；Boiler reversal chamber is connected in the biomass boiler；Reducing agent storage bin is connected with reducing agent confession
It should pump, the reducing agent transfer pump passes through the first metered dispensing unit respectively and is connected with the SNCR denitrification spray gun, passes through second
Metered dispensing unit is connected with the denitrification reducing agent supplement spray gun for being located at boiler reversal chamber side；The boiler reversal chamber is logical
Piping is connected with the SCR reactor, is provided with catalyst layer in the SCR reactor；The SCR reactor, which is connected with, to be removed
Dirt device, the deduster are connected by air-introduced machine with chimney；Be equipped between the air-introduced machine and the chimney air blower with
The biomass boiler is connected.
In the above-mentioned technical solutions, it is provided with SNCR denitrification spray gun above the chimney arch, close to chimney arch, close to flame
Top, using the low feature of biomass flame intensity, room and time needed for guaranteeing SNCR reaction to greatest extent promotes denitration
Efficiency；Reducing agent transfer pump is separately connected there are two metered dispensing unit, so that it can be restored for SNCR denitrification spray gun and denitration
Agent supplements spray gun and provides reducing agent, and SNCR denitrification spray gun combines configuration mode using fixed spray gun and tape travel switch spray gun, can
Fully ensure that coverage effect of the reducing agent on section of burner hearth, guarantee is well mixed with NOx in flue gas, while tape travel switch spray
Rifle can flexible modulation, to boiler actual condition have stronger matching adaptability；Pacify between the air-introduced machine and the chimney
It is connected equipped with air blower with the biomass boiler, part neat stress is introduced to by biomass boiler by air blower, flue gas is again
Circulation.
The utility model further improvement lies in that, the SCR reactor upstream entrance section is provided with pre-duster；It is described
Soot blower is provided on SCR reactor, the soot blower is the combination of steam sootblower or acoustic wave ash ejector and shock wave soot blower,
And the soot blower is located above the catalyst layer；Fundamentally solve dust stratification blockage problem.
The utility model further improvement lies in that, which further includes having compressed air cylinder, compressed air cylinder difference
It is connected with the biomass boiler and boiler reversal chamber；Enough oxygen is provided.
The utility model further improvement lies in that, the spray gun is efficient group of fixed spray gun and tape travel switch spray gun
It closes, it can be achieved that boiler furnace section effectively covers and is adjusted flexibly, realization reducing agent is mixed with the efficient of flue gas；All spray guns
Single-sided arrangement, the arrangement space limitation problem for overcoming live boiler to frequently encounter can be achieved.
Detailed description of the invention
Further describe with reference to the accompanying drawing the technical solution of the utility model includes:
Fig. 1 is the flow diagram of the efficient NOx control method of the utility model biomass boiler；
Fig. 2 is the structural schematic diagram of the efficient NOx control device of biomass boiler；
Wherein: 1- biomass boiler, 2- chimney arch, 3- denitration spray gun, the first metered dispensing unit of 4-, the supply of 5- reducing agent
Pump, 6- reducing agent storage bin, 7- compressed air cylinder, 8- reversal chamber, 9- denitrification reducing agent supplement spray gun, 10-SCR reactor,
11- catalyst, 12- soot blower, 13- deduster, 14- air-introduced machine, 15- air blower, 16- chimney；The metering distribution dress of 17- second
It sets；18- pre-duster.
Specific embodiment
In order to deepen the understanding to the utility model, the utility model is done further below in conjunction with drawings and examples
Detailed description, the embodiment are only used for explaining the utility model, do not constitute and limit to the protection scope of the utility model.
The efficient NOx control method of the biomass boiler of the utility model, low nitrogen burning use flue gas recirculation, including following
Step:
(1) flue gas secondary combustion: part neat stress is sent into biomass boiler and carries out second-time burning；
(2) denitrations: the NOx that biomass combustion generates in the step (1) is de- using SNCR in biomass boiler
Nitre technique, reducing agent are atomized into droplet, are mixed, are occurred with the high-temperature flue gas in the biomass boiler in the step (1)
Redox reaction carries out a denitration；
(3) secondary denitration: the flue gas after the SNCR denitration in the step (2) is supplemented by denitrification reducing agent again to be sprayed
Rifle supplements reducing agent in boiler reversal chamber, and after reducing agent is mixed with flue gas, selective catalysis occurs also under the effect of the catalyst
Original reaction；
(4) flue gas after denitration enters downstream installation, most enters smoke stack emission after air-introduced machine is pressurized afterwards；
Urea or ammonium hydroxide may be selected in the reducing agent.
In the step (2), close to biomass boiler chimney arch, close to above flame, sprinkling is atomized into droplet
Reducing agent.
In the step (3), catalyst uses 18 holes and 18 holes macroporous catalyst below or board-like catalyst, catalysis
Soot blower is set above oxidant layer.
In the present embodiment, the efficient NOx control device of biomass boiler includes biomass boiler 1, in the biomass
The top of the chimney arch 2 of boiler 1 is provided with SNCR denitrification spray gun 3, and the SNCR denitrification spray gun 3 is that fixed spray gun and tape travel switch
The efficient combination of spray gun realizes the efficient of reducing agent and flue gas, it can be achieved that boiler furnace section effectively covers and is adjusted flexibly
Mixing；All denitration spray guns 3 can realize single-sided arrangement, the arrangement space limitation problem for overcoming live boiler to frequently encounter；Institute
It states biomass boiler 1 and is connected with boiler reversal chamber 8；Reducing agent storage bin 6 is connected with reducing agent transfer pump 5, and the reducing agent supplies
5 should be pumped to be connected by the first metered dispensing unit 4 with the SNCR denitrification spray gun 3 respectively, pass through the second metered dispensing unit 17
It is connected with the denitrification reducing agent supplement spray gun 9 for being located at 8 side of boiler reversal chamber；The boiler reversal chamber 8 by pipeline with
The SCR reactor 10 is connected, and is provided with catalyst layer 11 in the SCR reactor 10；The SCR reactor 10, which is connected with, to be removed
Dirt device 13, the deduster 13 are connected by air-introduced machine 14 with chimney 16；Pacify between the air-introduced machine 14 and the chimney 16
It is connected equipped with air blower 15 with the biomass boiler 1；The 10 upstream entrance section of SCR reactor is provided with pre-duster 18；
Soot blower 12 is provided on the SCR reactor 10, the soot blower is steam sootblower or acoustic wave ash ejector and shock-wave ash blowing
The combination of device, and the soot blower 12 is located at 11 top of catalyst layer.
The device further includes having compressed air cylinder 7, the compressed air cylinder 7 respectively with the biomass boiler 1 and boiler
Reversal chamber 8 is connected.
Specifically used above-mentioned apparatus realizes the efficient NOx control method of biomass boiler are as follows: as shown in Figure 1, 2, arrow in Fig. 1
Shown in direction be flue gas flow direction, part neat stress by air blower 15 be sent into biomass boiler 1 carry out second-time burning, can make
NOx generation amount decline 20% or so；The NOx that biomass combustion generates uses SNCR denitration technique, storage in biomass boiler 1
It is pumped into the first metered dispensing unit 4 via reducing agent transfer pump 5 in the reducing agent in reducing agent storage bin 6, then send to denitration and sprays
Rifle 3 is atomized into the droplet of certain size, is mixed with the high-temperature flue gas in biomass boiler, redox reaction occurs, and takes off
Nitre efficiency is up to 60%；Flue gas after SNCR denitration enters downstream SCR reactor 10, then is supplemented and sprayed by denitrification reducing agent
Rifle 9 supplements a certain amount of reducing agent (completing reducing agent distribution by the second metered dispensing unit 17), reduction in boiler reversal chamber 8
After agent is mixed with flue gas, selective catalytic reduction reaction, denitration efficiency occur for catalyst in catalyst layer 11 under the action of
Up to 85%；Flue gas after denitration enters the facilities such as downstream deduster 13, most enters 16 row of chimney after the pressurization of air-introduced machine 14 afterwards
It puts；The conventional aminos reducing agent such as urea, ammonium hydroxide may be selected in reducing agent.
Catalyst in catalyst layer 11 is guaranteed steady in a long-term using the effective catalyst of the poisonings such as moisture-proof, alkali resistant metal
Reliability service.
For the ordinary skill in the art, specific embodiment has only carried out exemplary retouch to the utility model
It states, it is clear that the utility model specific implementation is not subject to the restrictions described above, as long as using the method concept of the utility model
The improvement of the various unsubstantialities carried out with technical solution, or the not improved conception and technical scheme by the utility model are direct
Applied to other occasions, it both is within the protection scope of the present invention.
Claims (4)
1. a kind of efficient NOx control device of biomass boiler, includes biomass boiler, which is characterized in that the biomass pot
Furnace is provided with chimney arch, SNCR denitrification spray gun is provided with above the chimney arch, the SNCR denitrification spray gun is using fixed spray gun
With tape travel switch spray gun combination configuration；Boiler reversal chamber is connected in the biomass boiler；Reducing agent storage bin is connected with
Reducing agent transfer pump, the reducing agent transfer pump pass through the first metered dispensing unit respectively and are connected with the SNCR denitrification spray gun,
Spray gun is supplemented with the denitrification reducing agent for being located at boiler reversal chamber side by the second metered dispensing unit to be connected；The boiler
Reversal chamber is connected by pipeline with SCR reactor, is provided with catalyst layer in the SCR reactor；The SCR reactor connection
There is deduster, the deduster is connected by air-introduced machine with chimney；Air blast is installed between the air-introduced machine and the chimney
Machine is connected with the biomass boiler.
2. the efficient NOx control device of biomass boiler according to claim 1, which is characterized in that on the SCR reactor
Trip entrance is provided with pre-duster；Soot blower is provided on the SCR reactor, the soot blower is steam sootblower or sound
The combination of wave soot blower and shock wave soot blower, and the soot blower is located above the catalyst layer.
3. the efficient NOx control device of biomass boiler according to claim 2, which is characterized in that the device further includes having
Compressed air cylinder, the compressed air cylinder are connected with the biomass boiler and boiler reversal chamber respectively.
4. the efficient NOx control device of biomass boiler according to claim 3, which is characterized in that the SNCR denitration spray
Rifle is the efficient combination of fixed spray gun and tape travel switch spray gun.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201820119216.3U CN208244426U (en) | 2018-01-24 | 2018-01-24 | A kind of efficient NOx control device of biomass boiler |
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| CN201820119216.3U CN208244426U (en) | 2018-01-24 | 2018-01-24 | A kind of efficient NOx control device of biomass boiler |
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| CN208244426U true CN208244426U (en) | 2018-12-18 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108126491A (en) * | 2018-01-24 | 2018-06-08 | 江苏德义通环保科技有限公司 | A kind of efficient NOx control method and device of biomass boiler |
| CN112807982A (en) * | 2020-12-26 | 2021-05-18 | 青岛诺瑞尔节能环保科技有限公司 | Chain boiler SNCR (selective non-catalytic reduction) denitration method, polymerization-dispersion type flue gas mixed reaction furnace arch and chain boiler SNCR denitration system |
-
2018
- 2018-01-24 CN CN201820119216.3U patent/CN208244426U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108126491A (en) * | 2018-01-24 | 2018-06-08 | 江苏德义通环保科技有限公司 | A kind of efficient NOx control method and device of biomass boiler |
| CN112807982A (en) * | 2020-12-26 | 2021-05-18 | 青岛诺瑞尔节能环保科技有限公司 | Chain boiler SNCR (selective non-catalytic reduction) denitration method, polymerization-dispersion type flue gas mixed reaction furnace arch and chain boiler SNCR denitration system |
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