CN105783020A - Oxygen-rich low-nitrate combustion and denitration process of coal-fired boiler - Google Patents

Oxygen-rich low-nitrate combustion and denitration process of coal-fired boiler Download PDF

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Publication number
CN105783020A
CN105783020A CN201610249583.0A CN201610249583A CN105783020A CN 105783020 A CN105783020 A CN 105783020A CN 201610249583 A CN201610249583 A CN 201610249583A CN 105783020 A CN105783020 A CN 105783020A
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boiler
oxygen
air
coal
burning
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CN105783020B (en
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周礼
李东林
章春
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Chengdu Huaxitang Environment Protection Technology Co Ltd
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Chengdu Huaxitang Environment Protection Technology Co Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23K—FEEDING FUEL TO COMBUSTION APPARATUS
    • F23K5/00—Feeding or distributing other fuel to combustion apparatus
    • F23K5/002—Gaseous fuel
    • 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 
    • F23C7/00—Combustion apparatus characterised by arrangements for air supply
    • 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
    • F23L7/00—Supplying non-combustible liquids or gases, other than air, to the fire, e.g. oxygen, steam
    • F23L7/007—Supplying oxygen or oxygen-enriched 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
    • Y02E20/32—Direct CO2 mitigation
    • 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 invention discloses an oxygen-rich low-nitrate combustion and denitration process of a coal-fired boiler. According to the process, flue gas is obtained after both carbon-monoxide-rich mixed gas and boiler primary air are supplied to the main combustion area of the of the coal-fired boiler, and boiler flue gas is obtained after the obtained flue gas is supplied to a desulfurization and denitration device, wherein the boiler primary air comprises oxygen prepared from air by a VPSA/PSA oxygen-rich device; and the carbon-monoxide-rich mixed gas comprises the following components in percentage by volume: 0.001-1% of oxygen, 0.1-20% of carbon dioxide and 79-99% of carbon monoxide. The process provided by the invention has the advantages that the carbon-monoxide-rich mixed gas and the boiler primary air (oxygen) are supplied to the main combustion area of the coal-fired boiler; through the cooperative utilization of oxygen, carbon dioxide, carbon monoxide and the boiler primary air according to a certain ratio, nitric oxide generated in the boiler combustion process can be converted into nitrogen, and thus the content of nitric oxides in the boiler flue gas can be effectively lowered; and the utilization of a reducing agent according to a selective non-catalytic reduction method is avoided, so as to improve the system stability.

Description

A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique
Technical field
The present invention is a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, is specifically related to the process of a kind of oxygen enrichment low nitrogen burning denitration that can realize coal-burning boiler, belongs to coal-fired flue-gas and industrial furnace smoke.
Background technology
The energy resources natural endowment of China determines China's energy supply based on coal and consumptio.Coal-fired flue-gas constitutes the most important air pollution source of China.Industry and life coal-fired flue-gas are carried out purification treatment, is that China administers air pollution, improves the key link of atmosphere quality.
Along with the continuous lifting that smoke gas treatment is required, the deficiency that existing gas denitrifying technology exists day by day manifests:
1) denitrification process depends on catalyst, reducing agent or oxidant, and operating cost is high, complicated operation.Oxidation and denitration technology path oxidant cost is high, and catalytic-reduction denitrified technology path is more a lack of effective application on medium and small boiler and realizes working condition so that medium and small boiler denitration never has the solution that Technological Economy is feasible；
2) under the situation that discharge standard improves constantly, prior art runs the limit having reached the application of its technique.For realizing extremely high-level qualified discharge; existing catalytic-reduction denitrified technique sprays into as cost with excess of ammonia reducing agent invariably; cause whole smoke gas treatment system material unbalance; caking blocking is formed at air preheater place; cannot steady in a long-term run at all; cause that whole steam generator system it is frequently necessary to shut down cleaning, become the big pain spot using unit.
It is understood that, denitration is exactly the process removing nitrogen oxides in effluent, it is that follow-up denitrating technique forms pressure for producing too much nitrogen oxides after preventing boiler combustion, existing patent documentation CN103170225A(mono-kind realizes industry cellar for storing things stove oxygen-enriched combustion-supporting and combines with flue gas desulfurization and denitrification system, 2013.03.01) disclose one utilize rich Combustion Technics save industry cellar for storing things stove firing rate and reduce discharge waste gas in NOX, SOX content, the system combined with flue gas desulfurization and denitrification again, but in the denitrating system of this technique, still continue to use existing reducing agent and spray into denitration, system stable operation is brought hidden danger.
In addition, in reducing the nitrogen oxides that boiler combustion produces, domestic multiple Patents is also in succession occurred in that, for instance:
The reduction nitric oxide system that patent documentation CN201748452U(selective non-catalytic reduction system and combustion system combine, 2011.02.16) propose can better liquid reducing agent be sprayed into burner hearth and the one that combines with combustion system reduces nitric oxide system, owing to using SNCR method, the conventional ammonia of liquid reducing agent or carbamide, still cannot be avoided the impact that system stable operation is caused.
Patent documentation CN204042872U(low nitrogen burning and SNCR denitration device, 2014.12.24) mode adopting low NO and SNCR denitration device to combine that proposes, the reducing agent wherein used remains as ammonia or liquefied ammonia, cannot be avoided the impact that system stable operation is caused equally.
Patent documentation CN104501203A(anoxia CO 2 enriched gas realizes the Apparatus and method for that the gas mixture ratio example of low nitrogen burning controls, 2015.04.08) propose increase gas concentration lwevel in boiler by smoke backflow, make boiler internal fuel anoxycausis, the carbon dioxide of backflow and carbon black granules and fuel generate carbon, can produce carbon monoxide under this ignition temperature and anoxia condition；Organic nitrogen in fuel can quickly produce nitric oxide when lower temperature burns, during the carbon monoxide of the significantly high concentration produced when the nitric oxide generated runs into anoxycausis when, nitrogen is become by conversion of nitric oxide gas, thus realizing removing overwhelming majority fuel NO in combustion, reach to reduce the emission reduction effect of nitrogen oxides generation amount.
Summary of the invention
It is an object of the invention to provide a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, rich carbon mono oxide mixture and boiler First air (oxygen) are sent into the primary zone of boiler, utilize the oxygen of special ratios, carbon dioxide, carbon monoxide and boiler First air with the use of, the conversion of nitric oxide gas produced in boiler combustion process can be become nitrogen, the content of nitrogen oxides in boiler smoke is made effectively to be reduced, avoid using the use to reducing agent of the SNCR method, improve system stability.
The present invention is achieved through the following technical solutions: a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, described boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, described rich carbon mono oxide mixture includes following component:
Oxygen: 0.001～1%；
Carbon dioxide: 0.1～20%；
Carbon monoxide: 79～99%.
The present invention adds appropriate carbon monoxide in the boiler First air entering boiler primary zone, it is made to suppress the generation of nitrogen oxides to be maybe nitrogen by the reduction of nitrogen oxide of generation in combustion in the primary zone of boiler combustion and burning-out zone, thus the amount of nitrogen oxides realizing boiler smoke reduces.
Adding appropriate oxygen in the boiler First air in boiler primary zone, can lower the burning-point of fuel, and primary zone is in oxygen-deficient environment, the carbon monoxide of generation can make primary zone be in reducing environment.
At described rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 1～5%.
Described rich carbon mono oxide mixture adds in carbon monoxide generator coke, richness oxygen and carbon dioxide and produce.
The carbon dioxide added in described carbon monoxide generator is produced by boiler smoke by VPSA device or is supplied outward.
The oxygen enrichment added in described carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.
The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air, from air, are sent into boiler combustion exhausted district by described boiler secondary air in the lump.
The present invention blends appropriate oxygen in boiler secondary air and reacts, burn step by step thus being formed so that in burner hearth, there is no obvious high-temperature region, thus the amount of nitrogen oxides realizing boiler smoke reduces, at described oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
The excessive carbon dioxide produced with boiler combustion of dropping a hint of described VPSA/PSA oxygen-enriching device is by chimney emptying.
Described steam coal powder sends into boiler primary zone after mixing with boiler smoke, it is to avoid boiler combustion uses air, reduces the generation of nitrogen oxides.
Described desulfuring and denitrifying apparatus adopts dry desulfurization denitration.
The present invention compared with prior art, has the following advantages and beneficial effect:
(1) richness carbon mono oxide mixture and boiler First air are sent into boiler by the present invention in the lump, carbon monoxide appropriate in rich carbon mono oxide mixture, it is made to suppress the generation of nitrogen oxides to be maybe nitrogen by the reduction of nitrogen oxide of generation in combustion in the primary zone of boiler combustion and burning-out zone, thus the amount of nitrogen oxides realizing boiler smoke reduces, and ensure that the content of nitrogen oxides in effluent can control at 100mg/m3Left and right, in prior art, in the boiler smoke produced after boiler combustion, the control content of nitrogen oxides is only 200 ~ 300mg/m3。
(2) the boiler First air of the present invention includes appropriate oxygen, make in the gaseous mixture that rich carbon mono oxide mixture and boiler First air form, the content of oxygen controls 23%～30%, the burning-point of fuel can be lowered, and primary zone is in oxygen-deficient environment, the carbon monoxide of generation can make primary zone be in reducing environment.
(3) present invention blends appropriate oxygen in boiler secondary air and reacts, and in boiler secondary air, the content of oxygen controls, 23%, to be formed and burn step by step so that do not have obvious high-temperature region in burner hearth, thus the amount of nitrogen oxides realizing boiler smoke reduces.
(4) present invention can realize the cycling and reutilization of boiler smoke, reduces emptying amount, and boiler smoke can be delivered to VSPA device with air-introduced machine and produce carbon dioxide, delivers to carbon monoxide generator and produces rich carbon mono oxide mixture；Also boiler primary zone can be sent into coal dust after mixing.
(5) present invention uses clean boiler smoke, as air-supply wind regime, coal dust is introduced boiler, it has the advantages of: avoid using air as wind regime, reduce air and introduce boiler generation nitrogen oxides: the temperature of purifying smoke, generally at 90～130 DEG C, can improve the initiation temperature of coal dust, burns more abundant.
(6) present invention is that one is utilized respectively different mixing gas group and becomes boiler First air and boiler secondary air to realize boiler fractional combustion flow process, boiler First air is equipped with appropriate carbon monoxide and oxygen, boiler secondary air is equipped with appropriate oxygen, the oxygen enrichment low nitrogen burning of boiler can be realized, boiler combustion process realizes denitration, it may be achieved the content of nitrogen oxides in effluent controls at 100mg/m3Left and right, flue gas obtains in boiler smoke after desulfuring and denitrifying apparatus, and the content of nitrogen oxides can control at 50mg/m further3Below.
Accompanying drawing explanation
Fig. 1 is the process flow diagram () of the present invention.
Fig. 2 is the process flow diagram (two) of the present invention.
Detailed description of the invention
Below in conjunction with embodiment, the present invention is described in further detail, but embodiments of the present invention are not limited to this.
Embodiment 1:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 0.001%；
Carbon dioxide: 0.999%；
Carbon monoxide: 99%.
Embodiment 2:
The present embodiment proposes on the basis of embodiment 1, by the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device by chimney emptying.
Embodiment 3:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 1%；
Carbon dioxide: 0.1%；
Carbon monoxide: 98.9%.
In above-mentioned flow process, at rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 1%.
Embodiment 4:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 1%；
Carbon dioxide: 19%；
Carbon monoxide: 80%.
In above-mentioned flow process, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, wherein, in carbon monoxide generator, the carbon dioxide of addition is produced by VPSA device by boiler smoke and to be obtained.
Embodiment 5:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 1%；
Carbon dioxide: 20%；
Carbon monoxide: 79%.
In above-mentioned flow process, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, wherein, in carbon monoxide generator, the carbon dioxide of addition is obtained by outer confession.
Embodiment 6:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 0.05%；
Carbon dioxide: 1.5%；
Carbon monoxide: 98.45%.
In above-mentioned flow process, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, wherein, the oxygen enrichment added in carbon monoxide generator by VPSA/PSA oxygen-enriching device from air prepared.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is by chimney emptying.
Embodiment 7:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 0.8%；
Carbon dioxide: 12%；
Carbon monoxide: 87.2%.
In above-mentioned flow process, that sends into boiler also has boiler secondary air, and this boiler secondary air is from air.The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and wherein, at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is by chimney emptying.
Embodiment 8:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 0.16%；
Carbon dioxide: 2.6%；
Carbon monoxide: 97.24%.
In above-mentioned flow process, steam coal powder sends into boiler primary zone after mixing with boiler smoke.
Embodiment 9:
The present embodiment relates to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, rich carbon mono oxide mixture includes following component:
Oxygen: 0.48%；
Carbon dioxide: 15.2%；
Carbon monoxide: 84.32%.
In above-mentioned flow process, desulfuring and denitrifying apparatus adopts dry desulfurization denitration.
Embodiment 10:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, including following technological process:
Richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump；The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 5%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.08%, the carbon dioxide of 11%, 88.92% carbon monoxide.The carbon dioxide added in carbon monoxide generator is produced by VPSA device by boiler smoke and is obtained；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
Embodiment 11:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, including following technological process:
Richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump；The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 2%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.09%, the carbon dioxide of 10.08%, 89.83% carbon monoxide.The carbon dioxide added in carbon monoxide generator is that outer confession obtains；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
Embodiment 12:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, as it is shown in figure 1, include following technological process:
Richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump；The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 4%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.6%, the carbon dioxide of 1.7%, 97.7% carbon monoxide.The carbon dioxide added in carbon monoxide generator is produced by VPSA device by boiler smoke and is obtained；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is each through chimney emptying.
Embodiment 13:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, as in figure 2 it is shown, include following technological process:
Richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump；The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 2.5%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.66%, the carbon dioxide of 8.5%, 90.84% carbon monoxide.The carbon dioxide added in carbon monoxide generator is that outer confession obtains；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is by chimney emptying.
Embodiment 14:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, as it is shown in figure 1, include following technological process:
Richness carbon mono oxide mixture is sent into boiler primary zone with boiler First air in the lump by primary air fan；The oxygen prepared from air by VPSA/PSA oxygen-enriching device is sent into boiler combustion exhausted district with boiler secondary air in the lump by overfire air fan, thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 1.6%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.06%, the carbon dioxide of 14%, 85.94% carbon monoxide.The carbon dioxide added in carbon monoxide generator is produced by VPSA device by boiler smoke and is obtained；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is each through chimney emptying.
Embodiment 15:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, as it is shown in figure 1, include following technological process:
Richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump；The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 3%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.008%, the carbon dioxide of 2.36%, 97.632% carbon monoxide.The carbon dioxide added in carbon monoxide generator is produced by VPSA device by boiler smoke and is obtained；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is each through chimney emptying.
Embodiment 16:
A kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, as in figure 2 it is shown, include following technological process:
Richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump；The oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air are sent into boiler combustion exhausted district in the lump, and thus obtained flue gas is then through obtaining boiler smoke after dry desulfurization denitration, and steam coal powder sends into boiler primary zone after mixing with boiler smoke.
The following is describing in further detail above-mentioned technological process:
At rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 1～5%.Wherein, rich carbon mono oxide mixture adds in carbon monoxide generator coke, rich oxygen and carbon dioxide and produce, count by volume, richness carbon mono oxide mixture includes: the oxygen of 0.05%, the carbon dioxide of 7.3%, 92.65% carbon monoxide.The carbon dioxide added in carbon monoxide generator is that outer confession obtains；The oxygen enrichment added in carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.Boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device.
Boiler secondary air is from air, and at oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
In above-mentioned flow process, the excessive carbon dioxide produced with boiler combustion of dropping a hint of VPSA/PSA oxygen-enriching device is by chimney emptying.
The above, be only presently preferred embodiments of the present invention, and the present invention not does any pro forma restriction, every above example is made according to the technical spirit of the present invention any simple modification, equivalent variations, each fall within protection scope of the present invention.

Claims (10)

1. a coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique, it is characterized in that: richness carbon mono oxide mixture and boiler First air are sent into boiler primary zone in the lump, thus obtained flue gas is then through obtaining boiler smoke after desulfuring and denitrifying apparatus, described boiler First air includes the oxygen prepared from air by VPSA/PSA oxygen-enriching device, counting by volume, described rich carbon mono oxide mixture includes following component:
Oxygen: 0.001～1%；
Carbon dioxide: 0.1～20%；
Carbon monoxide: 79～99%.
2. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to claim 1, it is characterised in that: at described rich carbon mono oxide mixture with the gaseous mixture of boiler First air composition, the content of carbon monoxide controls 1～5%.
3. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to claim 1, it is characterised in that: described rich carbon mono oxide mixture adds in carbon monoxide generator coke, richness oxygen and carbon dioxide and produce.
4. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to claim 3, it is characterised in that: the carbon dioxide added in described carbon monoxide generator is produced by boiler smoke by VPSA device or is supplied outward.
5. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to claim 3, it is characterised in that: the oxygen enrichment added in described carbon monoxide generator is prepared from air by VPSA/PSA oxygen-enriching device.
6. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to claim 1, it is characterised in that: the oxygen prepared from air by VPSA/PSA oxygen-enriching device and boiler secondary air, from air, are sent into boiler combustion exhausted district by described boiler secondary air in the lump.
7. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to claim 6, it is characterised in that: at described oxygen with the gaseous mixture of boiler secondary air composition, oxygen content controls 23%.
8. a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique according to any one of claim 1,5,6 or 7, it is characterised in that: the excessive carbon dioxide produced with boiler combustion of dropping a hint of described VPSA/PSA oxygen-enriching device is by chimney emptying.
9. according to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique described in claim 1, it is characterised in that: described steam coal powder sends into boiler primary zone after mixing with boiler smoke.
10. according to a kind of coal-burning boiler oxygen enrichment low nitrogen burning denitrating technique described in claim 1, it is characterised in that: described desulfuring and denitrifying apparatus adopts dry desulfurization denitration.
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CN102374781A (en) * 2010-08-17 2012-03-14 济源市万洋冶炼(集团)有限公司 Direct lead-smelting comprehensive metallurgical device and smelting process
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