CN106369595B - A kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization and processing system - Google Patents
A kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization and processing system Download PDFInfo
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- CN106369595B CN106369595B CN201611073315.4A CN201611073315A CN106369595B CN 106369595 B CN106369595 B CN 106369595B CN 201611073315 A CN201611073315 A CN 201611073315A CN 106369595 B CN106369595 B CN 106369595B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23C—METHODS OR APPARATUS FOR COMBUSTION USING FLUID FUEL OR SOLID FUEL SUSPENDED IN A CARRIER GAS OR AIR
- F23C9/00—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber
- F23C9/06—Combustion apparatus characterised by arrangements for returning combustion products or flue gases to the combustion chamber for completing combustion
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J11/00—Devices for conducting smoke or fumes, e.g. flues
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/006—Layout of treatment plant
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
- F25J3/00—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification
- F25J3/02—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream
- F25J3/04—Processes or apparatus for separating the constituents of gaseous or liquefied gaseous mixtures involving the use of liquefaction or solidification by rectification, i.e. by continuous interchange of heat and material between a vapour stream and a liquid stream for air
- F25J3/04006—Providing pressurised feed air or process streams within or from the air fractionation unit
- F25J3/04078—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression
- F25J3/0409—Providing pressurised feed air or process streams within or from the air fractionation unit providing pressurized products by liquid compression and vaporisation with cold recovery, i.e. so-called internal compression of oxygen
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J2900/00—Special arrangements for conducting or purifying combustion fumes; Treatment of fumes or ashes
- F23J2900/13001—Preventing or reducing corrosion in chimneys
-
- 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
- F23L2900/00—Special arrangements for supplying or treating air or oxidant for combustion; Injecting inert gas, water or steam into the combustion chamber
- F23L2900/07005—Injecting pure 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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Air Supply (AREA)
- Chimneys And Flues (AREA)
Abstract
A kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization provided in an embodiment of the present invention and processing system, it realizes and the air separator system of oxygen-enriched combustion boiler and flue gas recirculation system and tail flue gas energy regenerating processing system is coupled, boiler back end ductwork is divided into three parallel flues, flue gas recycled amount and temperature are adjusted, improves system to the adaptability of coal；Pass through low-pressure coal saver Mist heat recovering；It adjusts air preheater and exports oxygen temperature；Three parallel flues intercouple, and increase the adjusting nargin of flue-gas temperature.Using high-temperature flue gas and the recycling mixed flue gas recycled of low-temperature flue gas as First air, avoid the occurrence of the phenomenon that lower vapor liquefaction for causing flue gas recirculation to accumulate of a wind-warm syndrome blocks pulverized coal channel, air preheater volume is reduced, save the cost improves economy.
Description
Technical field:
The invention belongs to boiler tail flue gas energy utilization and process fields, are specifically designed a kind of efficient oxygen-enriched combusting pot
Furnace tail flue gas energy utilization and processing system.
Background technique:
With the aggravation of global warming and the frequent generation of extreme weather, the whole world for greenhouse gas emission attention rate with
Day all increasings.In the future for a long period of time, coal will be as main fossil energy to be used.Due to China energy resource structure with
Based on coal, therefore coal fired thermal power plant is the main force of China's Electric Power Industry.Nineteen fifty-two, the China Mei electricity Zhan total installation of generating capacity
90.4%, account for the 82.2% of total power generation；Although later specific gravity is declined, hold to the China Mei electricity Reng Zhan total installed capacity in 2000
The 74.4% of amount, accounts for the 81.0% of total power generation.Coal discharges a large amount of CO in combustion2, CO2Emission reduction problem will become one
Long-range circumstances problem urgently to be resolved.Therefore, CO2The extensive concern of capture and Plugging Technology Applied by countries in the world researcher, and
Oxygen-enriched combustion technology is considered as certain most promising carbon capture Plugging Technology Applied.
Compared with conventional air burning, due to introducing air separation equipment and carbon dioxide compression in oxygen-enriched combustion boiler
Liquefying plant causes power plants generating electricity efficiency to decline 8% or so.In order to improve generating efficiency as far as possible, energy utilization rate is improved, with
Conventional air burning is compared, and should reduce flue-gas temperature as far as possible, carries out multistage recycling to flue gas waste heat at the end of boiler.
In oxygen-enriched combustion boiler, mixed with flue gas recycled as combustion-supporting gas using the pure oxygen that air separator is isolated
It is sent into boiler furnace, the purpose for using flue gas recirculation is with the CO in flue gas2To replace the N in combustion air2With O2Join together
With burning, furnace high-temperature is neutralized, water-cooling wall film boiling is avoided.It is usually conveyed using flue gas recycled as First air and dry
Coal dust.
Due to using flue gas recirculation in oxygen-enriched combusting, vapor constantly accumulated, cause in First air water vapour content compared with
Height, if flue gas recycled temperature is too low, Water vapor condensation is easy blocking pulverized coal channel, and is unfavorable for coal powder ignition；Together
When, after dehumidifying, vapor volume fraction reduces boiler tail flue gas, significantly reduces flue gas acid dew point temperature, is conducive to
Mitigate the acid corrosion of heating surface metal；And temperature reduces after fume-dehydrating, under identical mass flow, flue gas volume flow
Reduce, recirculation blower power consumption reduces.
In addition, in thermal power plant, the high fume temperature of boiler is always the problem that annoying people.Only
The energy loss as caused by exhaust gas temperature height is with regard to considerable.According to statistics, in thermal power plant, boiler exhaust gas heat waste
Mistake accounts for the 70%~80% of boiler Total heat loss.Meanwhile with the increase of boiler operation time, heating surface retrofit degree is aggravated,
Cause exhaust gas temperature 20 DEG C~30 DEG C higher than design temperature.The exhaust gas temperature of boiler is excessively high, increases thermal power plant coal consumption amount.
And the exhaust gas temperature of the coal-burning power plant of Chinese active service at present has generally reached 120 DEG C~130 DEG C, therefore heat loss due to exhaust gas is each as boiler
Specific gravity maximum one in item heat loss.For being equipped with the Thermal generation unit of independent desulphurization system, excessively high flue-gas temperature exists
A large amount of steam can be also carried when desulfurization, increase desulfurization water consume.Therefore boiler exhaust gas thermal energy is not only the very big waste heat of potentiality
Resource, and the flue gas after temperature reduction can also reduce desulfurization water consume, save water resource.
In oxygen-enriched combustion boiler system, compared with conventional air burning boiler, air-seperation system and CO are increased2Pressure
Contracting liquefaction recovery system, system complexity improve.How boiler tail flue gas ability to be utilized and processing system and oxygen-enriched combusting
Boiler system coupling realizes that energy synthesis recycles, the problem of improving generating efficiency, be current urgent need to resolve.
Summary of the invention
A kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization provided in an embodiment of the present invention and processing system, it is real
Show the air separator system of oxygen-enriched combustion boiler and flue gas recirculation system and tail flue gas energy regenerating processing system
It is coupled, boiler back end ductwork is divided into three parallel flues, adjusts flue gas recycled amount and temperature, improve system to coal
Adaptability；Pass through low-pressure coal saver Mist heat recovering；It adjusts air preheater and exports oxygen temperature；Three parallel flue phase mutual coupling
It closes, increases the adjusting nargin of flue-gas temperature.Using high-temperature flue gas and the recycling mixed flue gas recycled conduct of low-temperature flue gas
First air avoids the occurrence of the phenomenon that lower vapor liquefaction for causing flue gas recirculation to accumulate of a wind-warm syndrome blocks pulverized coal channel,
Air preheater volume is reduced, save the cost improves economy.
A kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization provided in an embodiment of the present invention and processing system, packet
Include: boiler body (1), burner (2), economizer (3), back-end ductwork are divided into three parallel flues, respectively parallel flue one
(4), parallel flue two (5) and parallel flue three (6), steam air heater (9), deduster (10), recirculation blower (11), pressure fan
(12), primary dehumidification device (13), deep dehumidification apparatus (14), air-introduced machine (15), desulfuring and denitrifying apparatus (16), waste heat recycling dress
It sets (17), compressor (18), air separator (19)；
Boiler body (1) inner wall is provided with the burner (2), the burner (2) and the pressure fan (12)
It connects, is provided with the economizer (3) at boiler body (1) back-end ductwork, is provided with below the economizer (3) described
Parallel flue one (4), parallel flue two (5) and parallel flue three (6)；
Low-pressure coal saver (7) are arranged in the parallel flue two (5), and air preheat is arranged in the parallel flue three (6)
Device (8).
Optionally, the parallel flue one (4) is connected with the recirculation blower (11), the arrangement low-pressure coal saver
(7), the air preheater (8) connect with the steam air heater (9), and the steam air heater (9) connect with the deduster (10).
Optionally, the deduster (10), the recirculation blower (11) and the primary dehumidification device (13), the depth
Degree dehumidification device (14), the desulfuring and denitrifying apparatus (16) are sequentially connected；
The steam air heater (9) connect with the deep dehumidification apparatus (14), the deep dehumidification apparatus (14) and the sky
Gas separating device (19) connection, the air separator (19), the desulfuring and denitrifying apparatus (16) and the waste-heat recovery device
(17) it connects, the waste-heat recovery device (17) connect with the compressor (18).
Optionally, boiler back end ductwork is divided into three parallel flues, respectively parallel flue one (4), parallel flue two (5)
It is vacant in parallel flue one (4) with parallel flue three (6), high-temperature flue gas and recycling low-temperature flue gas are mixed, recycling is improved
Flue-gas temperature, flue gas recycled needs not move through air preheater heating, therefore air preheater need to only be used to preheated oxygen, reduce
Air preheater volume, save the cost improve economy；Flue gas recycled temperature is adjusted by corresponding gas baffle, is improved
Adaptability of the system to coal；Mixed flue gas recycled carries coal dust by pressure fan (12) and is sent into boiler furnace；In parallel
Low-pressure coal saver (7) are arranged in flue two (5), Mist heat recovering heating boiler feed water；Air is arranged in parallel flue three (6)
Preheater (8), heats oxygen using fume afterheat, exhaust gas volumn is adjusted by corresponding gas baffle, to adjust air preheat
The temperature of device outlet oxygen.Three parallel flues are mutually coupled, and increase the adjusting nargin of flue-gas temperature.
Optionally, the flue gas being discharged from parallel flue two (5) and (6) enters steam air heater (9), is heated using fume afterheat
Oxygen.
Optionally, it is dusted by the flue gas of steam air heater (9) by deduster (10), it is low after extracting a part of dedusting
Warm flue gas is sent into parallel flue one (4) by recirculation blower (11) is mixed for flue gas recirculation with high-temperature flue gas；Pass through
The parallel corresponding gas baffle of flue adjusts flue gas recycled temperature, improves system to the adaptability of coal.Remaining flue gas according to
It is secondary to enter primary dehumidification device (13) and deep dehumidification apparatus (14).
Optionally, primary dehumidification device (13), which absorbs fume afterheat using cold water, condenses the vapor in flue gas, thus
Achieve the purpose that removal moisture drying, the hot water after absorbing fume afterheat can be used for the domestic water of near power station resident, improve energy
Utilization efficiency, it is energy saving.
Optionally, the cold energy for the liquid oxygen that deep dehumidification apparatus (14) makes full use of air separator to isolate, vaporization of liquid oxygen
Heat absorption dehumidifying, the oxygen after vaporization is sequentially sent to be sent into after steam air heater (9) and air preheater (8) preheating by air-introduced machine (15) to be fired
Burner (2)；On the one hand it can make full use of the cold energy of liquid oxygen that flue gas is further dried, facilitate the recycling of subsequent flue gas；Another party
Face, it is not necessary to gaseous state oxygen can be obtained using special vaporization of liquid oxygen device, reduce station-service electricity, improve generating efficiency.
Optionally, enter waste-heat recovery device (17) after desulfuring and denitrifying apparatus (16) by the flue gas of dedusting dehumidifying,
On the one hand, it makes full use of air separation plant to obtain the cold energy of low temperature nitrogen, further decreases flue-gas temperature, obtain low-temperature flue gas,
Reduce CO2The energy consumption of process is compressed and liquefied, power plant efficiency is improved；On the other hand, the nitrogen of acquisition can be used for food processing
Food is fresh-keeping in industry.
Optionally, the flue gas after dedusting dehumidifies and the waste heat that is fully utilized is liquefied as liquid by compressor (18)
CO2It seals up for safekeeping.
As can be seen from the above technical solutions, the embodiment of the present invention has the advantage that
The present invention provides a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization and processing system, which will
The air separator system of oxygen-enriched combustion boiler is coupled with flue gas recirculation system and tail flue gas energy regenerating processing system,
Boiler back end ductwork is divided into three parallel flues, adjusts flue gas recycled amount and temperature, improves system to the adaptability of coal；
Pass through low-pressure coal saver Mist heat recovering；It adjusts air preheater and exports oxygen temperature；Three parallel flues intercouple, and increase cigarette
The adjusting nargin of temperature degree.Using high-temperature flue gas and the recycling mixed flue gas recycled of low-temperature flue gas as First air, keep away
Exempt from the phenomenon that lower vapor liquefaction for causing flue gas recirculation to accumulate of a wind-warm syndrome blocks pulverized coal channel occur, it is pre- to reduce air
Hot body product, save the cost improve economy.
Flue gas after dedusting removes the recycling low-temperature flue gas extracted, successively by primary dehumidification device and depth dehumidifying dress
It sets, convenient for the recycling of subsequent flue gas, avoids low-temperature corrosion；And by energy recovery and processing system and oxygen-enriched combustion boiler air point
It is coupled from system, makes full use of the cold energy of isolated liquid oxygen, absorbed fume afterheat, Water vapor condensation is made to reach depth drying
Purpose；The complexity of oxygen-enriched combustion system is reduced simultaneously, and no setting is required vaporization of liquid oxygen device reduces energy consumption, improves energy utilization
Rate.Cold water is heated to be hot water by primary dehumidification device, which can be used for the domestic water of near power station resident.
Flue gas after dehumidifying is after desulfuring and denitrifying apparatus, by waste heat recovery device, with oxygen-enriched combustion boiler sky
Gas separating system coupling, using the cold energy of isolated low temperature nitrogen, heat in further recovered flue gas, make flue-gas temperature into
One step reduces, and obtains low-temperature flue gas, reduces CO2Energy consumption during compressing and liquefying, compressor power consumption reduce, and improve energy benefit
Use efficiency；Meanwhile by the flue gas waste heat recovery of boiler tail and energy processing system and oxygen-enriched combustion boiler air-seperation system
Coupling makes full use of the cold energy of liquid oxygen and low temperature nitrogen, and Mist heat recovering reduces smoke processing system energy consumption, realizes the energy
Reasonable utilization.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization provided in the embodiment of the present invention and processing
One embodiment structural schematic diagram of method；
Illustrate: 1 is boiler body, and 2 be burner, and 3 be economizer, and 4 be parallel flue (for mixing high-temperature flue gas
With recycling low-temperature flue gas), 5 be parallel flue (for arranging low-pressure coal saver), 6 for parallel flue (for arranging that air is pre-
Hot device), 7 be low-pressure coal saver, and 8 be air preheater, and 9 be steam air heater, and 10 be deduster, and 11 be recirculation blower, and 12 be to send
Blower, 13 be primary dehumidification device, and 14 be deep dehumidification apparatus, and 15 be pressure fan, and 16 be desulfuring and denitrifying apparatus, and 17 return for waste heat
Receiving apparatus, 18 be compressor, and 19 be air separator.
Specific embodiment
A kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization provided in an embodiment of the present invention and processing system, it is real
Show the air separator system of oxygen-enriched combustion boiler and flue gas recirculation system and tail flue gas energy regenerating processing system
It is coupled, boiler back end ductwork is divided into three parallel flues, adjusts flue gas recycled amount and temperature, improve system to coal
Adaptability；Pass through low-pressure coal saver Mist heat recovering；It adjusts air preheater and exports oxygen temperature；Three parallel flue phase mutual coupling
It closes, increases the adjusting nargin of flue-gas temperature.Using high-temperature flue gas and the recycling mixed flue gas recycled conduct of low-temperature flue gas
First air avoids the occurrence of the phenomenon that lower vapor liquefaction for causing flue gas recirculation to accumulate of a wind-warm syndrome blocks pulverized coal channel,
Air preheater volume is reduced, save the cost improves economy.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization provided in the embodiment of the present invention
And one embodiment of processing system includes:
Boiler body (1), burner (2), economizer (3), back-end ductwork are divided into three parallel flues, respectively parallel cigarette
Road one (4), parallel flue two (5) and parallel flue three (6), steam air heater (9), deduster (10), recirculation blower (11), air-supply
Machine (12), primary dehumidification device (13), deep dehumidification apparatus (14), air-introduced machine (15), desulfuring and denitrifying apparatus (16), waste heat recycling
Device (17), compressor (18), air separator (19)；
Boiler body (1) inner wall is provided with the burner (2), the burner (2) and the pressure fan (12)
It connects, is provided with the economizer (3) at boiler body (1) back-end ductwork, is provided with below the economizer (3) described
Parallel flue one (4), parallel flue two (5) and parallel flue three (6)；
Low-pressure coal saver (7) are arranged in the parallel flue two (5), and air preheat is arranged in the parallel flue three (6)
Device (8).
Optionally, the parallel flue one (4) is connected with the recirculation blower (11), the arrangement low-pressure coal saver
(7), the air preheater (8) connect with the steam air heater (9), and the steam air heater (9) connect with the deduster (10).
Optionally, the deduster (10), the recirculation blower (11) and the primary dehumidification device (13), the depth
Degree dehumidification device (14), the desulfuring and denitrifying apparatus (16) are sequentially connected；
The steam air heater (9) connect with the deep dehumidification apparatus (14), the deep dehumidification apparatus (14) and the sky
Gas separating device (19) connection, the air separator (19), the desulfuring and denitrifying apparatus (16) and the waste-heat recovery device
(17) it connects, the waste-heat recovery device (17) connect with the compressor (18).
Optionally, boiler back end ductwork is divided into three parallel flues, respectively parallel flue one (4), parallel flue two (5)
It is vacant in parallel flue one (4) with parallel flue three (6), high-temperature flue gas and recycling low-temperature flue gas are mixed, recycling is improved
Flue-gas temperature, flue gas recycled needs not move through air preheater heating, therefore air preheater need to only be used to preheated oxygen, reduce
Air preheater volume, save the cost improve economy；Flue gas recycled temperature is adjusted by corresponding gas baffle, is improved
Adaptability of the system to coal；Mixed flue gas recycled carries coal dust by pressure fan (12) and is sent into boiler furnace；In parallel
Low-pressure coal saver (7) are arranged in flue two (5), Mist heat recovering heating boiler feed water；Air is arranged in parallel flue three (6)
Preheater (8), heats oxygen using fume afterheat, exhaust gas volumn is adjusted by corresponding gas baffle, to adjust air preheat
The temperature of device outlet oxygen.Three parallel flues are mutually coupled, and increase the adjusting nargin of flue-gas temperature.
Optionally, the flue gas being discharged from parallel flue two (5) and (6) enters steam air heater (9), is heated using fume afterheat
Oxygen.
Optionally, it is dusted by the flue gas of steam air heater (9) by deduster (10), it is low after extracting a part of dedusting
Warm flue gas is sent into parallel flue one (4) by recirculation blower (11) is mixed for flue gas recirculation with high-temperature flue gas；Pass through
The parallel corresponding gas baffle of flue adjusts flue gas recycled temperature, improves system to the adaptability of coal.Remaining flue gas according to
It is secondary to enter primary dehumidification device (13) and deep dehumidification apparatus (14).
Optionally, primary dehumidification device (13), which absorbs fume afterheat using cold water, condenses the vapor in flue gas, thus
Achieve the purpose that removal moisture drying, the hot water after absorbing fume afterheat can be used for the domestic water of near power station resident, improve energy
Utilization efficiency, it is energy saving.
Optionally, the cold energy for the liquid oxygen that deep dehumidification apparatus (14) makes full use of air separator to isolate, vaporization of liquid oxygen
Heat absorption dehumidifying, the oxygen after vaporization is sequentially sent to be sent into after steam air heater (9) and air preheater (8) preheating by air-introduced machine (15) to be fired
Burner (2)；On the one hand it can make full use of the cold energy of liquid oxygen that flue gas is further dried, facilitate the recycling of subsequent flue gas；Another party
Face, it is not necessary to gaseous state oxygen can be obtained using special vaporization of liquid oxygen device, reduce station-service electricity, improve generating efficiency.
Optionally, enter waste-heat recovery device (17) after desulfuring and denitrifying apparatus (16) by the flue gas of dedusting dehumidifying,
On the one hand, it makes full use of air separation plant to obtain the cold energy of low temperature nitrogen, further decreases flue-gas temperature, obtain low-temperature flue gas,
Reduce CO2The energy consumption of process is compressed and liquefied, power plant efficiency is improved；On the other hand, the nitrogen of acquisition can be used for food processing
Food is fresh-keeping in industry.
Optionally, the flue gas after dedusting dehumidifies and the waste heat that is fully utilized is liquefied as liquid by compressor (18)
CO2It seals up for safekeeping.
Boiler body 1, burner 2, economizer 3, parallel flue 4, wherein high-temperature flue gas is mixed with recycling low-temperature flue gas
Coal dust is carried afterwards enters boiler furnace, parallel flue 5, wherein arrange low-pressure coal saver, parallel flue 6, wherein arrangement air is pre-
Hot device, low-pressure coal saver 7, air preheater 8, steam air heater 9, deduster 10, recirculation blower 11, pressure fan 12, primary dehumidifying
Device 13, deep dehumidification apparatus 14, pressure fan 15, desulfuring and denitrifying apparatus 16, waste-heat recovery device 17, compressor 18, air point
From device 19；Wherein:
Boiler back end ductwork is divided into three parallel flues, and parallel flue 4 is used for high-temperature flue gas and recycling low-temperature flue gas
It is used as flue gas recycled after mixing, coal dust is carried after pressure fan 12 and is sent into burner 2, meets fire box temperature and heat exchange need
It wants；On the one hand using high-temperature flue gas heating recycling low-temperature flue gas, recycling low-temperature flue gas needs not move through air preheater progress
Preheating reduces air preheater volume, reduces cost, improves economy；On the other hand, mixed flue gas recycled temperature compared with
The vapor of height, the accumulation of flue gas recirculation process is not easy to condense, and avoids blocking pulverized coal channel.By the flue gas for adjusting corresponding flue
Baffle adjusts flue gas recycled amount and temperature, improves system to the adaptability of coal；Low-pressure coal saver 7 is arranged in parallel flue 5
Mist heat recovering improves generating efficiency using fume afterheat heating boiler feed water；Air preheater 8 is arranged in parallel flue 6
Oxygen is heated, adjusts air preheater outlet oxygen temperature by adjusting corresponding gas baffle；Three parallel flues intercouple, and increase
Add the adjusting nargin of flue-gas temperature；
Parallel flue 5 first passes through steam air heater 9 with the flue gas that parallel flue 6 is discharged, and heats oxygen using fume afterheat；Later
Processing is dusted by deduster 10；Low-temperature flue gas after dedusting extracts part of smoke by recirculation blower 11 and is sent into
In vacant parallel flue 4, by pressure fan 12 after being mixed with high-temperature flue gas, carries coal dust and be sent into boiler furnace, meet burner hearth
The needs of temperature and heat exchange；
Remaining flue gas successively dehumidifies by primary dehumidification device 13 and deep dehumidification apparatus 14；Primary dehumidification device 13 utilizes
Cold water absorbs fume afterheat as heat transferring medium, makes Water vapor condensation in flue gas, and absorbing the hot water that flue gas heat obtains can be used for
The domestic water of near power station resident；Deep dehumidification apparatus 14 is absorbed using the vaporization of liquid oxygen process that air separator 19 is isolated
Heat in flue gas, makes full use of the cold energy of liquid oxygen, further removes the vapor in flue gas, is CO in flue gas2Trapping and
It seals up for safekeeping and prepares；Meanwhile vaporization of liquid oxygen is set to obtain gaseous state combustion-supporting gas using the heat in flue gas, it is no longer necessary to be arranged special
Vaporization of liquid oxygen device reduces the complexity of oxygen-enriched combustion boiler system, reduces station-service electricity, improves power plant efficiency；
Flue gas after dedusting dehumidifying, into waste-heat recovery device 17, utilizes air separation after desulfuring and denitrifying apparatus 16
Device 19 obtains the cold energy of low temperature nitrogen, absorbs the heat in flue gas, further decreases flue-gas temperature, obtain low-temperature flue gas, subtract
Few CO2The energy consumption of process is compressed and liquefied, generating efficiency is improved；Meanwhile by the flue gas waste heat recovery of boiler tail and energy utilization
System is coupled with oxygen-enriched combustion boiler system, makes full use of the cold energy of liquid oxygen and low temperature nitrogen, realizes the comprehensive utilization of energy；Most
Flue gas is liquid CO by the liquefaction of compressor 18 afterwards2It is sealed up for safekeeping.
The present invention provides a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization and processing system, which will
The air separator system of oxygen-enriched combustion boiler is coupled with flue gas recirculation system and tail flue gas energy recycling system, by pot
Furnace back-end ductwork is divided into three parallel flues, adjusts flue gas recycled amount and temperature, improves system to the adaptability of coal；Pass through
Low-pressure coal saver Mist heat recovering；It adjusts air preheater and exports oxygen temperature；Three parallel flues intercouple, and increase flue gas temperature
The adjusting nargin of degree.Using high-temperature flue gas and the recycling mixed recycling high-temperature flue gas of low-temperature flue gas as First air, benefit
Recycling low-temperature flue gas is heated with high-temperature flue gas, the recycling low-temperature flue gas of extraction needs not move through air preheater and is preheated,
Air preheater volume is reduced, cost is reduced, improves economy；Avoid the occurrence of that a wind-warm syndrome is lower to lead to flue gas recirculation simultaneously
The phenomenon that vapor liquefaction blocking pulverized coal channel of accumulation；Avoid the low-temperature corrosion in subsequent thermal face.Flue gas after dedusting removes
The recycling low-temperature flue gas of extraction, successively by primary dehumidification device and deep dehumidification apparatus, and it is empty with oxygen-enriched combustion boiler
Gas separating system coupling absorbs fume afterheat using the vaporescence of isolated liquid oxygen, makes Water vapor condensation to reach deep
Spend dry purpose；Meanwhile vaporization of liquid oxygen is set to obtain gaseous state combustion-supporting gas using the heat in flue gas, it is not necessary to which special liquid is set
Oxygen vapourizing unit reduces the complexity of oxygen-enriched combustion boiler system, reduces station-service electricity, improves power plant efficiency.Cigarette after dehumidifying
Gas, by waste heat recovery device, couples after desulfuring and denitrifying apparatus with oxygen-enriched combustion boiler air-seperation system, utilizes
The cold energy of isolated low temperature nitrogen fully absorbs the heat in flue gas, so that flue-gas temperature further decreases, reduces CO2Pressure
Energy consumption in contracting liquefaction process further increases total energy approach rate.
The present invention provides a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization and processing system, which will
The air separator system of oxygen-enriched combustion boiler is coupled with flue gas recirculation system and tail flue gas energy regenerating processing system,
Boiler back end ductwork is divided into three parallel flues, adjusts flue gas recycled amount and temperature, improves system to the adaptability of coal；
Pass through low-pressure coal saver Mist heat recovering；It adjusts air preheater and exports oxygen temperature；Three parallel flues intercouple, and increase cigarette
The adjusting nargin of temperature degree.Using high-temperature flue gas and the recycling mixed flue gas recycled of low-temperature flue gas as First air, keep away
Exempt from the phenomenon that lower vapor liquefaction for causing flue gas recirculation to accumulate of a wind-warm syndrome blocks pulverized coal channel occur, it is pre- to reduce air
Hot body product, save the cost improve economy.
Flue gas after dedusting removes the recycling low-temperature flue gas extracted, successively by primary dehumidification device and depth dehumidifying dress
It sets, convenient for the recycling of subsequent flue gas, avoids low-temperature corrosion；And by energy recovery and processing system and oxygen-enriched combustion boiler air point
It is coupled from system, makes full use of the cold energy of isolated liquid oxygen, absorbed fume afterheat, Water vapor condensation is made to reach depth drying
Purpose；The complexity of oxygen-enriched combustion system is reduced simultaneously, and no setting is required vaporization of liquid oxygen device reduces energy consumption, improves energy utilization
Rate.Cold water is heated to be hot water by primary dehumidification device, which can be used for the domestic water of near power station resident.
Flue gas after dehumidifying is after desulfuring and denitrifying apparatus, by waste heat recovery device, with oxygen-enriched combustion boiler sky
Gas separating system coupling, using the cold energy of isolated low temperature nitrogen, heat in further recovered flue gas, make flue-gas temperature into
One step reduces, and obtains low-temperature flue gas, reduces CO2Energy consumption during compressing and liquefying, compressor power consumption reduce, and improve energy benefit
Use efficiency；Meanwhile by the flue gas waste heat recovery of boiler tail and energy processing system and oxygen-enriched combustion boiler air-seperation system
Coupling makes full use of the cold energy of liquid oxygen and low temperature nitrogen, and Mist heat recovering reduces smoke processing system energy consumption, realizes the energy
Reasonable utilization.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (9)
1. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization and processing system, which is characterized in that including boiler sheet
Body (1), burner (2), economizer (3), back-end ductwork are divided into three parallel flues, respectively parallel flue one (4), parallel cigarette
Road two (5) and parallel flue three (6), steam air heater (9), deduster (10), recirculation blower (11), pressure fan (12), primary is removed
Wet device (13), deep dehumidification apparatus (14), air-introduced machine (15), desulfuring and denitrifying apparatus (16), waste-heat recovery device (17), compression
Machine (18), air separator (19)；
Boiler body (1) inner wall is provided with the burner (2), and the burner (2) connect with the pressure fan (12),
It is provided with the economizer (3), is provided with below the economizer (3) described parallel at boiler body (1) back-end ductwork
Flue one (4), parallel flue two (5) and parallel flue three (6)；
Wherein, flue gas is provided in the parallel flue one (4), the parallel flue two (5) and the parallel flue three (6)
Baffle enters the exhaust gas volumn of corresponding flue for adjusting high-temperature flue gas；It is vacant in the parallel flue one (4), it is used for high temperature
Flue gas and recycling low-temperature flue gas mixing；Mixed flue gas recycled carries coal dust by pressure fan (12) and is sent into Boiler Furnace
Thorax；Low-pressure coal saver (7) are arranged in the parallel flue two (5), are used for Mist heat recovering heating boiler feed water；It is described parallel
Air preheater (8) are arranged in flue three (6), for heating oxygen using fume afterheat；
By the low-temperature flue gas of the parallel flue two (5) and the parallel flue three (6), by steam air heater (9), using removing
After dirt device (10) is dusted, the low-temperature flue gas after dedusting is extracted a part and is transmitted back in parallel by recirculation blower (11)
It is mixed in flue one (4) with high-temperature flue gas, is used for flue gas recirculation.
2. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
It is characterized in that:
The parallel flue one (4) is connected with the recirculation blower (11), the low-pressure coal saver (7) and the air preheat
Device (8) is connect with the steam air heater (9), and the steam air heater (9) connect with the deduster (10).
3. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
It is characterized in that:
The deduster (10), the recirculation blower (11) and the primary dehumidification device (13), the deep dehumidification apparatus
(14), the desulfuring and denitrifying apparatus (16) is sequentially connected；
The steam air heater (9) connect with the deep dehumidification apparatus (14), the deep dehumidification apparatus (14) and the air point
It is connected from device (19), the air separator (19), the desulfuring and denitrifying apparatus (16) and the waste-heat recovery device (17) connect
It connects, the waste-heat recovery device (17) connect with the compressor (18).
4. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
It is characterized in that: entering steam air heater (9) from parallel flue two (5) with the flue gas being discharged in parallel flue three (6), utilize fume afterheat
Heat oxygen.
5. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
Be characterized in that: the low-temperature flue gas after deduster (10) dedusting be not extracted be sent into recirculation blower (11) remaining flue gas according to
It is secondary to enter primary dehumidification device (13) and deep dehumidification apparatus (14).
6. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
Be characterized in that: primary dehumidification device (13), which absorbs fume afterheat using cold water, condenses the vapor in flue gas, removes to reach
The purpose of wet drying, the hot water after absorbing fume afterheat can be used for the domestic water of near power station resident, improve energy utilization effect
Rate, it is energy saving.
7. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
Be characterized in that: the cold energy for the liquid oxygen that deep dehumidification apparatus (14) makes full use of air separator to isolate, vaporization of liquid oxygen heat absorption remove
Wet, the oxygen after vaporization is sent into burner after being sequentially sent to steam air heater (9) and air preheater (8) preheating by air-introduced machine (15)
(2)；On the one hand it can make full use of the cold energy of liquid oxygen that flue gas is further dried, facilitate the recycling of subsequent flue gas；On the other hand, no
Gaseous state oxygen must be can be obtained using special vaporization of liquid oxygen device, reduce station-service electricity, improve generating efficiency.
8. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
It is characterized in that: entering waste-heat recovery device (17) after desulfuring and denitrifying apparatus (16) by the flue gas of dedusting dehumidifying, on the one hand,
It makes full use of air separation plant to obtain the cold energy of low temperature nitrogen, further decreases flue-gas temperature, obtain low-temperature flue gas, reduce CO2
The energy consumption of process is compressed and liquefied, power plant efficiency is improved；On the other hand, the nitrogen of acquisition can be used for eating in food-processing industry
Product it is fresh-keeping.
9. a kind of efficient oxygen-enriched combustion boiler tail flue gas energy utilization according to claim 1 and processing system,
Be characterized in that: the flue gas after dedusting dehumidifies and the waste heat that is fully utilized is liquefied as liquid CO by compressor (18)2It seals up for safekeeping.
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| CN106678852A (en) * | 2017-02-27 | 2017-05-17 | 北京京诚科林环保科技有限公司 | Gas heating boiler smoke latent heat recycle and treatment system |
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| CN108151051B (en) * | 2017-11-18 | 2019-06-04 | 西安交通大学 | A kind of large scale mixes the coal-fired power station boiler system and co-combustion method of burning semicoke |
| CN109107211B (en) * | 2018-08-30 | 2021-03-23 | 东南大学 | Device and method for compressing air and flue gas and recovering waste heat in oxygen-enriched combustion system |
| CN109724070B (en) * | 2019-02-21 | 2020-09-22 | 华中科技大学 | Pressurized oxygen-enriched coal burning system and method |
| CN113405279A (en) * | 2021-07-12 | 2021-09-17 | 辽宁绿源能源环保科技集团有限责任公司 | Low-nitrogen and concentrated-carbon combustion process method and system |
| CN113738325B (en) * | 2021-07-30 | 2022-05-20 | 西安交通大学 | System for rich oil coal normal position pyrolysis and carbon entrapment coupling |
| CN113738336B (en) * | 2021-07-30 | 2022-06-07 | 西安交通大学 | Oil-rich coal underground pyrolysis heat energy cyclic utilization system |
| CN116878286B (en) * | 2023-06-20 | 2023-12-12 | 江苏中顺节能科技有限公司 | System and method for enriching and utilizing carbon dioxide in tail gas of pure oxygen combustion kiln |
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Effective date of registration: 20220913 Address after: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee after: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Co.,Ltd. Address before: 510080 water Donggang 8, Dongfeng East Road, Yuexiu District, Guangzhou, Guangdong. Patentee before: ELECTRIC POWER RESEARCH INSTITUTE OF GUANGDONG POWER GRID Co.,Ltd. Patentee before: XI'AN JIAOTONG University |